File: | tools/clang/lib/Sema/SemaTemplateDeduction.cpp |
Warning: | line 756, column 3 Potential leak of memory pointed to by 'SawIndices.X' |
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1 | //===- SemaTemplateDeduction.cpp - Template Argument Deduction ------------===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | // This file implements C++ template argument deduction. | |||
10 | // | |||
11 | //===----------------------------------------------------------------------===// | |||
12 | ||||
13 | #include "clang/Sema/TemplateDeduction.h" | |||
14 | #include "TreeTransform.h" | |||
15 | #include "TypeLocBuilder.h" | |||
16 | #include "clang/AST/ASTContext.h" | |||
17 | #include "clang/AST/ASTLambda.h" | |||
18 | #include "clang/AST/Decl.h" | |||
19 | #include "clang/AST/DeclAccessPair.h" | |||
20 | #include "clang/AST/DeclBase.h" | |||
21 | #include "clang/AST/DeclCXX.h" | |||
22 | #include "clang/AST/DeclTemplate.h" | |||
23 | #include "clang/AST/DeclarationName.h" | |||
24 | #include "clang/AST/Expr.h" | |||
25 | #include "clang/AST/ExprCXX.h" | |||
26 | #include "clang/AST/NestedNameSpecifier.h" | |||
27 | #include "clang/AST/TemplateBase.h" | |||
28 | #include "clang/AST/TemplateName.h" | |||
29 | #include "clang/AST/Type.h" | |||
30 | #include "clang/AST/TypeLoc.h" | |||
31 | #include "clang/AST/UnresolvedSet.h" | |||
32 | #include "clang/Basic/AddressSpaces.h" | |||
33 | #include "clang/Basic/ExceptionSpecificationType.h" | |||
34 | #include "clang/Basic/LLVM.h" | |||
35 | #include "clang/Basic/LangOptions.h" | |||
36 | #include "clang/Basic/PartialDiagnostic.h" | |||
37 | #include "clang/Basic/SourceLocation.h" | |||
38 | #include "clang/Basic/Specifiers.h" | |||
39 | #include "clang/Sema/Ownership.h" | |||
40 | #include "clang/Sema/Sema.h" | |||
41 | #include "clang/Sema/Template.h" | |||
42 | #include "llvm/ADT/APInt.h" | |||
43 | #include "llvm/ADT/APSInt.h" | |||
44 | #include "llvm/ADT/ArrayRef.h" | |||
45 | #include "llvm/ADT/DenseMap.h" | |||
46 | #include "llvm/ADT/FoldingSet.h" | |||
47 | #include "llvm/ADT/Optional.h" | |||
48 | #include "llvm/ADT/SmallBitVector.h" | |||
49 | #include "llvm/ADT/SmallPtrSet.h" | |||
50 | #include "llvm/ADT/SmallVector.h" | |||
51 | #include "llvm/Support/Casting.h" | |||
52 | #include "llvm/Support/Compiler.h" | |||
53 | #include "llvm/Support/ErrorHandling.h" | |||
54 | #include <algorithm> | |||
55 | #include <cassert> | |||
56 | #include <tuple> | |||
57 | #include <utility> | |||
58 | ||||
59 | namespace clang { | |||
60 | ||||
61 | /// Various flags that control template argument deduction. | |||
62 | /// | |||
63 | /// These flags can be bitwise-OR'd together. | |||
64 | enum TemplateDeductionFlags { | |||
65 | /// No template argument deduction flags, which indicates the | |||
66 | /// strictest results for template argument deduction (as used for, e.g., | |||
67 | /// matching class template partial specializations). | |||
68 | TDF_None = 0, | |||
69 | ||||
70 | /// Within template argument deduction from a function call, we are | |||
71 | /// matching with a parameter type for which the original parameter was | |||
72 | /// a reference. | |||
73 | TDF_ParamWithReferenceType = 0x1, | |||
74 | ||||
75 | /// Within template argument deduction from a function call, we | |||
76 | /// are matching in a case where we ignore cv-qualifiers. | |||
77 | TDF_IgnoreQualifiers = 0x02, | |||
78 | ||||
79 | /// Within template argument deduction from a function call, | |||
80 | /// we are matching in a case where we can perform template argument | |||
81 | /// deduction from a template-id of a derived class of the argument type. | |||
82 | TDF_DerivedClass = 0x04, | |||
83 | ||||
84 | /// Allow non-dependent types to differ, e.g., when performing | |||
85 | /// template argument deduction from a function call where conversions | |||
86 | /// may apply. | |||
87 | TDF_SkipNonDependent = 0x08, | |||
88 | ||||
89 | /// Whether we are performing template argument deduction for | |||
90 | /// parameters and arguments in a top-level template argument | |||
91 | TDF_TopLevelParameterTypeList = 0x10, | |||
92 | ||||
93 | /// Within template argument deduction from overload resolution per | |||
94 | /// C++ [over.over] allow matching function types that are compatible in | |||
95 | /// terms of noreturn and default calling convention adjustments, or | |||
96 | /// similarly matching a declared template specialization against a | |||
97 | /// possible template, per C++ [temp.deduct.decl]. In either case, permit | |||
98 | /// deduction where the parameter is a function type that can be converted | |||
99 | /// to the argument type. | |||
100 | TDF_AllowCompatibleFunctionType = 0x20, | |||
101 | ||||
102 | /// Within template argument deduction for a conversion function, we are | |||
103 | /// matching with an argument type for which the original argument was | |||
104 | /// a reference. | |||
105 | TDF_ArgWithReferenceType = 0x40, | |||
106 | }; | |||
107 | } | |||
108 | ||||
109 | using namespace clang; | |||
110 | using namespace sema; | |||
111 | ||||
112 | /// Compare two APSInts, extending and switching the sign as | |||
113 | /// necessary to compare their values regardless of underlying type. | |||
114 | static bool hasSameExtendedValue(llvm::APSInt X, llvm::APSInt Y) { | |||
115 | if (Y.getBitWidth() > X.getBitWidth()) | |||
116 | X = X.extend(Y.getBitWidth()); | |||
117 | else if (Y.getBitWidth() < X.getBitWidth()) | |||
118 | Y = Y.extend(X.getBitWidth()); | |||
119 | ||||
120 | // If there is a signedness mismatch, correct it. | |||
121 | if (X.isSigned() != Y.isSigned()) { | |||
122 | // If the signed value is negative, then the values cannot be the same. | |||
123 | if ((Y.isSigned() && Y.isNegative()) || (X.isSigned() && X.isNegative())) | |||
124 | return false; | |||
125 | ||||
126 | Y.setIsSigned(true); | |||
127 | X.setIsSigned(true); | |||
128 | } | |||
129 | ||||
130 | return X == Y; | |||
131 | } | |||
132 | ||||
133 | static Sema::TemplateDeductionResult | |||
134 | DeduceTemplateArguments(Sema &S, | |||
135 | TemplateParameterList *TemplateParams, | |||
136 | const TemplateArgument &Param, | |||
137 | TemplateArgument Arg, | |||
138 | TemplateDeductionInfo &Info, | |||
139 | SmallVectorImpl<DeducedTemplateArgument> &Deduced); | |||
140 | ||||
141 | static Sema::TemplateDeductionResult | |||
142 | DeduceTemplateArgumentsByTypeMatch(Sema &S, | |||
143 | TemplateParameterList *TemplateParams, | |||
144 | QualType Param, | |||
145 | QualType Arg, | |||
146 | TemplateDeductionInfo &Info, | |||
147 | SmallVectorImpl<DeducedTemplateArgument> & | |||
148 | Deduced, | |||
149 | unsigned TDF, | |||
150 | bool PartialOrdering = false, | |||
151 | bool DeducedFromArrayBound = false); | |||
152 | ||||
153 | static Sema::TemplateDeductionResult | |||
154 | DeduceTemplateArguments(Sema &S, TemplateParameterList *TemplateParams, | |||
155 | ArrayRef<TemplateArgument> Params, | |||
156 | ArrayRef<TemplateArgument> Args, | |||
157 | TemplateDeductionInfo &Info, | |||
158 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
159 | bool NumberOfArgumentsMustMatch); | |||
160 | ||||
161 | static void MarkUsedTemplateParameters(ASTContext &Ctx, | |||
162 | const TemplateArgument &TemplateArg, | |||
163 | bool OnlyDeduced, unsigned Depth, | |||
164 | llvm::SmallBitVector &Used); | |||
165 | ||||
166 | static void MarkUsedTemplateParameters(ASTContext &Ctx, QualType T, | |||
167 | bool OnlyDeduced, unsigned Level, | |||
168 | llvm::SmallBitVector &Deduced); | |||
169 | ||||
170 | /// If the given expression is of a form that permits the deduction | |||
171 | /// of a non-type template parameter, return the declaration of that | |||
172 | /// non-type template parameter. | |||
173 | static NonTypeTemplateParmDecl * | |||
174 | getDeducedParameterFromExpr(TemplateDeductionInfo &Info, Expr *E) { | |||
175 | // If we are within an alias template, the expression may have undergone | |||
176 | // any number of parameter substitutions already. | |||
177 | while (true) { | |||
178 | if (ImplicitCastExpr *IC = dyn_cast<ImplicitCastExpr>(E)) | |||
179 | E = IC->getSubExpr(); | |||
180 | else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(E)) | |||
181 | E = CE->getSubExpr(); | |||
182 | else if (SubstNonTypeTemplateParmExpr *Subst = | |||
183 | dyn_cast<SubstNonTypeTemplateParmExpr>(E)) | |||
184 | E = Subst->getReplacement(); | |||
185 | else | |||
186 | break; | |||
187 | } | |||
188 | ||||
189 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) | |||
190 | if (auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl())) | |||
191 | if (NTTP->getDepth() == Info.getDeducedDepth()) | |||
192 | return NTTP; | |||
193 | ||||
194 | return nullptr; | |||
195 | } | |||
196 | ||||
197 | /// Determine whether two declaration pointers refer to the same | |||
198 | /// declaration. | |||
199 | static bool isSameDeclaration(Decl *X, Decl *Y) { | |||
200 | if (NamedDecl *NX = dyn_cast<NamedDecl>(X)) | |||
201 | X = NX->getUnderlyingDecl(); | |||
202 | if (NamedDecl *NY = dyn_cast<NamedDecl>(Y)) | |||
203 | Y = NY->getUnderlyingDecl(); | |||
204 | ||||
205 | return X->getCanonicalDecl() == Y->getCanonicalDecl(); | |||
206 | } | |||
207 | ||||
208 | /// Verify that the given, deduced template arguments are compatible. | |||
209 | /// | |||
210 | /// \returns The deduced template argument, or a NULL template argument if | |||
211 | /// the deduced template arguments were incompatible. | |||
212 | static DeducedTemplateArgument | |||
213 | checkDeducedTemplateArguments(ASTContext &Context, | |||
214 | const DeducedTemplateArgument &X, | |||
215 | const DeducedTemplateArgument &Y) { | |||
216 | // We have no deduction for one or both of the arguments; they're compatible. | |||
217 | if (X.isNull()) | |||
218 | return Y; | |||
219 | if (Y.isNull()) | |||
220 | return X; | |||
221 | ||||
222 | // If we have two non-type template argument values deduced for the same | |||
223 | // parameter, they must both match the type of the parameter, and thus must | |||
224 | // match each other's type. As we're only keeping one of them, we must check | |||
225 | // for that now. The exception is that if either was deduced from an array | |||
226 | // bound, the type is permitted to differ. | |||
227 | if (!X.wasDeducedFromArrayBound() && !Y.wasDeducedFromArrayBound()) { | |||
228 | QualType XType = X.getNonTypeTemplateArgumentType(); | |||
229 | if (!XType.isNull()) { | |||
230 | QualType YType = Y.getNonTypeTemplateArgumentType(); | |||
231 | if (YType.isNull() || !Context.hasSameType(XType, YType)) | |||
232 | return DeducedTemplateArgument(); | |||
233 | } | |||
234 | } | |||
235 | ||||
236 | switch (X.getKind()) { | |||
237 | case TemplateArgument::Null: | |||
238 | llvm_unreachable("Non-deduced template arguments handled above")::llvm::llvm_unreachable_internal("Non-deduced template arguments handled above" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 238); | |||
239 | ||||
240 | case TemplateArgument::Type: | |||
241 | // If two template type arguments have the same type, they're compatible. | |||
242 | if (Y.getKind() == TemplateArgument::Type && | |||
243 | Context.hasSameType(X.getAsType(), Y.getAsType())) | |||
244 | return X; | |||
245 | ||||
246 | // If one of the two arguments was deduced from an array bound, the other | |||
247 | // supersedes it. | |||
248 | if (X.wasDeducedFromArrayBound() != Y.wasDeducedFromArrayBound()) | |||
249 | return X.wasDeducedFromArrayBound() ? Y : X; | |||
250 | ||||
251 | // The arguments are not compatible. | |||
252 | return DeducedTemplateArgument(); | |||
253 | ||||
254 | case TemplateArgument::Integral: | |||
255 | // If we deduced a constant in one case and either a dependent expression or | |||
256 | // declaration in another case, keep the integral constant. | |||
257 | // If both are integral constants with the same value, keep that value. | |||
258 | if (Y.getKind() == TemplateArgument::Expression || | |||
259 | Y.getKind() == TemplateArgument::Declaration || | |||
260 | (Y.getKind() == TemplateArgument::Integral && | |||
261 | hasSameExtendedValue(X.getAsIntegral(), Y.getAsIntegral()))) | |||
262 | return X.wasDeducedFromArrayBound() ? Y : X; | |||
263 | ||||
264 | // All other combinations are incompatible. | |||
265 | return DeducedTemplateArgument(); | |||
266 | ||||
267 | case TemplateArgument::Template: | |||
268 | if (Y.getKind() == TemplateArgument::Template && | |||
269 | Context.hasSameTemplateName(X.getAsTemplate(), Y.getAsTemplate())) | |||
270 | return X; | |||
271 | ||||
272 | // All other combinations are incompatible. | |||
273 | return DeducedTemplateArgument(); | |||
274 | ||||
275 | case TemplateArgument::TemplateExpansion: | |||
276 | if (Y.getKind() == TemplateArgument::TemplateExpansion && | |||
277 | Context.hasSameTemplateName(X.getAsTemplateOrTemplatePattern(), | |||
278 | Y.getAsTemplateOrTemplatePattern())) | |||
279 | return X; | |||
280 | ||||
281 | // All other combinations are incompatible. | |||
282 | return DeducedTemplateArgument(); | |||
283 | ||||
284 | case TemplateArgument::Expression: { | |||
285 | if (Y.getKind() != TemplateArgument::Expression) | |||
286 | return checkDeducedTemplateArguments(Context, Y, X); | |||
287 | ||||
288 | // Compare the expressions for equality | |||
289 | llvm::FoldingSetNodeID ID1, ID2; | |||
290 | X.getAsExpr()->Profile(ID1, Context, true); | |||
291 | Y.getAsExpr()->Profile(ID2, Context, true); | |||
292 | if (ID1 == ID2) | |||
293 | return X.wasDeducedFromArrayBound() ? Y : X; | |||
294 | ||||
295 | // Differing dependent expressions are incompatible. | |||
296 | return DeducedTemplateArgument(); | |||
297 | } | |||
298 | ||||
299 | case TemplateArgument::Declaration: | |||
300 | assert(!X.wasDeducedFromArrayBound())((!X.wasDeducedFromArrayBound()) ? static_cast<void> (0 ) : __assert_fail ("!X.wasDeducedFromArrayBound()", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 300, __PRETTY_FUNCTION__)); | |||
301 | ||||
302 | // If we deduced a declaration and a dependent expression, keep the | |||
303 | // declaration. | |||
304 | if (Y.getKind() == TemplateArgument::Expression) | |||
305 | return X; | |||
306 | ||||
307 | // If we deduced a declaration and an integral constant, keep the | |||
308 | // integral constant and whichever type did not come from an array | |||
309 | // bound. | |||
310 | if (Y.getKind() == TemplateArgument::Integral) { | |||
311 | if (Y.wasDeducedFromArrayBound()) | |||
312 | return TemplateArgument(Context, Y.getAsIntegral(), | |||
313 | X.getParamTypeForDecl()); | |||
314 | return Y; | |||
315 | } | |||
316 | ||||
317 | // If we deduced two declarations, make sure that they refer to the | |||
318 | // same declaration. | |||
319 | if (Y.getKind() == TemplateArgument::Declaration && | |||
320 | isSameDeclaration(X.getAsDecl(), Y.getAsDecl())) | |||
321 | return X; | |||
322 | ||||
323 | // All other combinations are incompatible. | |||
324 | return DeducedTemplateArgument(); | |||
325 | ||||
326 | case TemplateArgument::NullPtr: | |||
327 | // If we deduced a null pointer and a dependent expression, keep the | |||
328 | // null pointer. | |||
329 | if (Y.getKind() == TemplateArgument::Expression) | |||
330 | return X; | |||
331 | ||||
332 | // If we deduced a null pointer and an integral constant, keep the | |||
333 | // integral constant. | |||
334 | if (Y.getKind() == TemplateArgument::Integral) | |||
335 | return Y; | |||
336 | ||||
337 | // If we deduced two null pointers, they are the same. | |||
338 | if (Y.getKind() == TemplateArgument::NullPtr) | |||
339 | return X; | |||
340 | ||||
341 | // All other combinations are incompatible. | |||
342 | return DeducedTemplateArgument(); | |||
343 | ||||
344 | case TemplateArgument::Pack: { | |||
345 | if (Y.getKind() != TemplateArgument::Pack || | |||
346 | X.pack_size() != Y.pack_size()) | |||
347 | return DeducedTemplateArgument(); | |||
348 | ||||
349 | llvm::SmallVector<TemplateArgument, 8> NewPack; | |||
350 | for (TemplateArgument::pack_iterator XA = X.pack_begin(), | |||
351 | XAEnd = X.pack_end(), | |||
352 | YA = Y.pack_begin(); | |||
353 | XA != XAEnd; ++XA, ++YA) { | |||
354 | TemplateArgument Merged = checkDeducedTemplateArguments( | |||
355 | Context, DeducedTemplateArgument(*XA, X.wasDeducedFromArrayBound()), | |||
356 | DeducedTemplateArgument(*YA, Y.wasDeducedFromArrayBound())); | |||
357 | if (Merged.isNull()) | |||
358 | return DeducedTemplateArgument(); | |||
359 | NewPack.push_back(Merged); | |||
360 | } | |||
361 | ||||
362 | return DeducedTemplateArgument( | |||
363 | TemplateArgument::CreatePackCopy(Context, NewPack), | |||
364 | X.wasDeducedFromArrayBound() && Y.wasDeducedFromArrayBound()); | |||
365 | } | |||
366 | } | |||
367 | ||||
368 | llvm_unreachable("Invalid TemplateArgument Kind!")::llvm::llvm_unreachable_internal("Invalid TemplateArgument Kind!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 368); | |||
369 | } | |||
370 | ||||
371 | /// Deduce the value of the given non-type template parameter | |||
372 | /// as the given deduced template argument. All non-type template parameter | |||
373 | /// deduction is funneled through here. | |||
374 | static Sema::TemplateDeductionResult DeduceNonTypeTemplateArgument( | |||
375 | Sema &S, TemplateParameterList *TemplateParams, | |||
376 | NonTypeTemplateParmDecl *NTTP, const DeducedTemplateArgument &NewDeduced, | |||
377 | QualType ValueType, TemplateDeductionInfo &Info, | |||
378 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
379 | assert(NTTP->getDepth() == Info.getDeducedDepth() &&((NTTP->getDepth() == Info.getDeducedDepth() && "deducing non-type template argument with wrong depth" ) ? static_cast<void> (0) : __assert_fail ("NTTP->getDepth() == Info.getDeducedDepth() && \"deducing non-type template argument with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 380, __PRETTY_FUNCTION__)) | |||
380 | "deducing non-type template argument with wrong depth")((NTTP->getDepth() == Info.getDeducedDepth() && "deducing non-type template argument with wrong depth" ) ? static_cast<void> (0) : __assert_fail ("NTTP->getDepth() == Info.getDeducedDepth() && \"deducing non-type template argument with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 380, __PRETTY_FUNCTION__)); | |||
381 | ||||
382 | DeducedTemplateArgument Result = checkDeducedTemplateArguments( | |||
383 | S.Context, Deduced[NTTP->getIndex()], NewDeduced); | |||
384 | if (Result.isNull()) { | |||
385 | Info.Param = NTTP; | |||
386 | Info.FirstArg = Deduced[NTTP->getIndex()]; | |||
387 | Info.SecondArg = NewDeduced; | |||
388 | return Sema::TDK_Inconsistent; | |||
389 | } | |||
390 | ||||
391 | Deduced[NTTP->getIndex()] = Result; | |||
392 | if (!S.getLangOpts().CPlusPlus17) | |||
393 | return Sema::TDK_Success; | |||
394 | ||||
395 | if (NTTP->isExpandedParameterPack()) | |||
396 | // FIXME: We may still need to deduce parts of the type here! But we | |||
397 | // don't have any way to find which slice of the type to use, and the | |||
398 | // type stored on the NTTP itself is nonsense. Perhaps the type of an | |||
399 | // expanded NTTP should be a pack expansion type? | |||
400 | return Sema::TDK_Success; | |||
401 | ||||
402 | // Get the type of the parameter for deduction. If it's a (dependent) array | |||
403 | // or function type, we will not have decayed it yet, so do that now. | |||
404 | QualType ParamType = S.Context.getAdjustedParameterType(NTTP->getType()); | |||
405 | if (auto *Expansion = dyn_cast<PackExpansionType>(ParamType)) | |||
406 | ParamType = Expansion->getPattern(); | |||
407 | ||||
408 | // FIXME: It's not clear how deduction of a parameter of reference | |||
409 | // type from an argument (of non-reference type) should be performed. | |||
410 | // For now, we just remove reference types from both sides and let | |||
411 | // the final check for matching types sort out the mess. | |||
412 | return DeduceTemplateArgumentsByTypeMatch( | |||
413 | S, TemplateParams, ParamType.getNonReferenceType(), | |||
414 | ValueType.getNonReferenceType(), Info, Deduced, TDF_SkipNonDependent, | |||
415 | /*PartialOrdering=*/false, | |||
416 | /*ArrayBound=*/NewDeduced.wasDeducedFromArrayBound()); | |||
417 | } | |||
418 | ||||
419 | /// Deduce the value of the given non-type template parameter | |||
420 | /// from the given integral constant. | |||
421 | static Sema::TemplateDeductionResult DeduceNonTypeTemplateArgument( | |||
422 | Sema &S, TemplateParameterList *TemplateParams, | |||
423 | NonTypeTemplateParmDecl *NTTP, const llvm::APSInt &Value, | |||
424 | QualType ValueType, bool DeducedFromArrayBound, TemplateDeductionInfo &Info, | |||
425 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
426 | return DeduceNonTypeTemplateArgument( | |||
427 | S, TemplateParams, NTTP, | |||
428 | DeducedTemplateArgument(S.Context, Value, ValueType, | |||
429 | DeducedFromArrayBound), | |||
430 | ValueType, Info, Deduced); | |||
431 | } | |||
432 | ||||
433 | /// Deduce the value of the given non-type template parameter | |||
434 | /// from the given null pointer template argument type. | |||
435 | static Sema::TemplateDeductionResult DeduceNullPtrTemplateArgument( | |||
436 | Sema &S, TemplateParameterList *TemplateParams, | |||
437 | NonTypeTemplateParmDecl *NTTP, QualType NullPtrType, | |||
438 | TemplateDeductionInfo &Info, | |||
439 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
440 | Expr *Value = | |||
441 | S.ImpCastExprToType(new (S.Context) CXXNullPtrLiteralExpr( | |||
442 | S.Context.NullPtrTy, NTTP->getLocation()), | |||
443 | NullPtrType, CK_NullToPointer) | |||
444 | .get(); | |||
445 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
446 | DeducedTemplateArgument(Value), | |||
447 | Value->getType(), Info, Deduced); | |||
448 | } | |||
449 | ||||
450 | /// Deduce the value of the given non-type template parameter | |||
451 | /// from the given type- or value-dependent expression. | |||
452 | /// | |||
453 | /// \returns true if deduction succeeded, false otherwise. | |||
454 | static Sema::TemplateDeductionResult DeduceNonTypeTemplateArgument( | |||
455 | Sema &S, TemplateParameterList *TemplateParams, | |||
456 | NonTypeTemplateParmDecl *NTTP, Expr *Value, TemplateDeductionInfo &Info, | |||
457 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
458 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
459 | DeducedTemplateArgument(Value), | |||
460 | Value->getType(), Info, Deduced); | |||
461 | } | |||
462 | ||||
463 | /// Deduce the value of the given non-type template parameter | |||
464 | /// from the given declaration. | |||
465 | /// | |||
466 | /// \returns true if deduction succeeded, false otherwise. | |||
467 | static Sema::TemplateDeductionResult DeduceNonTypeTemplateArgument( | |||
468 | Sema &S, TemplateParameterList *TemplateParams, | |||
469 | NonTypeTemplateParmDecl *NTTP, ValueDecl *D, QualType T, | |||
470 | TemplateDeductionInfo &Info, | |||
471 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
472 | D = D ? cast<ValueDecl>(D->getCanonicalDecl()) : nullptr; | |||
473 | TemplateArgument New(D, T); | |||
474 | return DeduceNonTypeTemplateArgument( | |||
475 | S, TemplateParams, NTTP, DeducedTemplateArgument(New), T, Info, Deduced); | |||
476 | } | |||
477 | ||||
478 | static Sema::TemplateDeductionResult | |||
479 | DeduceTemplateArguments(Sema &S, | |||
480 | TemplateParameterList *TemplateParams, | |||
481 | TemplateName Param, | |||
482 | TemplateName Arg, | |||
483 | TemplateDeductionInfo &Info, | |||
484 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
485 | TemplateDecl *ParamDecl = Param.getAsTemplateDecl(); | |||
486 | if (!ParamDecl) { | |||
487 | // The parameter type is dependent and is not a template template parameter, | |||
488 | // so there is nothing that we can deduce. | |||
489 | return Sema::TDK_Success; | |||
490 | } | |||
491 | ||||
492 | if (TemplateTemplateParmDecl *TempParam | |||
493 | = dyn_cast<TemplateTemplateParmDecl>(ParamDecl)) { | |||
494 | // If we're not deducing at this depth, there's nothing to deduce. | |||
495 | if (TempParam->getDepth() != Info.getDeducedDepth()) | |||
496 | return Sema::TDK_Success; | |||
497 | ||||
498 | DeducedTemplateArgument NewDeduced(S.Context.getCanonicalTemplateName(Arg)); | |||
499 | DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, | |||
500 | Deduced[TempParam->getIndex()], | |||
501 | NewDeduced); | |||
502 | if (Result.isNull()) { | |||
503 | Info.Param = TempParam; | |||
504 | Info.FirstArg = Deduced[TempParam->getIndex()]; | |||
505 | Info.SecondArg = NewDeduced; | |||
506 | return Sema::TDK_Inconsistent; | |||
507 | } | |||
508 | ||||
509 | Deduced[TempParam->getIndex()] = Result; | |||
510 | return Sema::TDK_Success; | |||
511 | } | |||
512 | ||||
513 | // Verify that the two template names are equivalent. | |||
514 | if (S.Context.hasSameTemplateName(Param, Arg)) | |||
515 | return Sema::TDK_Success; | |||
516 | ||||
517 | // Mismatch of non-dependent template parameter to argument. | |||
518 | Info.FirstArg = TemplateArgument(Param); | |||
519 | Info.SecondArg = TemplateArgument(Arg); | |||
520 | return Sema::TDK_NonDeducedMismatch; | |||
521 | } | |||
522 | ||||
523 | /// Deduce the template arguments by comparing the template parameter | |||
524 | /// type (which is a template-id) with the template argument type. | |||
525 | /// | |||
526 | /// \param S the Sema | |||
527 | /// | |||
528 | /// \param TemplateParams the template parameters that we are deducing | |||
529 | /// | |||
530 | /// \param Param the parameter type | |||
531 | /// | |||
532 | /// \param Arg the argument type | |||
533 | /// | |||
534 | /// \param Info information about the template argument deduction itself | |||
535 | /// | |||
536 | /// \param Deduced the deduced template arguments | |||
537 | /// | |||
538 | /// \returns the result of template argument deduction so far. Note that a | |||
539 | /// "success" result means that template argument deduction has not yet failed, | |||
540 | /// but it may still fail, later, for other reasons. | |||
541 | static Sema::TemplateDeductionResult | |||
542 | DeduceTemplateArguments(Sema &S, | |||
543 | TemplateParameterList *TemplateParams, | |||
544 | const TemplateSpecializationType *Param, | |||
545 | QualType Arg, | |||
546 | TemplateDeductionInfo &Info, | |||
547 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
548 | assert(Arg.isCanonical() && "Argument type must be canonical")((Arg.isCanonical() && "Argument type must be canonical" ) ? static_cast<void> (0) : __assert_fail ("Arg.isCanonical() && \"Argument type must be canonical\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 548, __PRETTY_FUNCTION__)); | |||
549 | ||||
550 | // Treat an injected-class-name as its underlying template-id. | |||
551 | if (auto *Injected = dyn_cast<InjectedClassNameType>(Arg)) | |||
552 | Arg = Injected->getInjectedSpecializationType(); | |||
553 | ||||
554 | // Check whether the template argument is a dependent template-id. | |||
555 | if (const TemplateSpecializationType *SpecArg | |||
556 | = dyn_cast<TemplateSpecializationType>(Arg)) { | |||
557 | // Perform template argument deduction for the template name. | |||
558 | if (Sema::TemplateDeductionResult Result | |||
559 | = DeduceTemplateArguments(S, TemplateParams, | |||
560 | Param->getTemplateName(), | |||
561 | SpecArg->getTemplateName(), | |||
562 | Info, Deduced)) | |||
563 | return Result; | |||
564 | ||||
565 | ||||
566 | // Perform template argument deduction on each template | |||
567 | // argument. Ignore any missing/extra arguments, since they could be | |||
568 | // filled in by default arguments. | |||
569 | return DeduceTemplateArguments(S, TemplateParams, | |||
570 | Param->template_arguments(), | |||
571 | SpecArg->template_arguments(), Info, Deduced, | |||
572 | /*NumberOfArgumentsMustMatch=*/false); | |||
573 | } | |||
574 | ||||
575 | // If the argument type is a class template specialization, we | |||
576 | // perform template argument deduction using its template | |||
577 | // arguments. | |||
578 | const RecordType *RecordArg = dyn_cast<RecordType>(Arg); | |||
579 | if (!RecordArg) { | |||
580 | Info.FirstArg = TemplateArgument(QualType(Param, 0)); | |||
581 | Info.SecondArg = TemplateArgument(Arg); | |||
582 | return Sema::TDK_NonDeducedMismatch; | |||
583 | } | |||
584 | ||||
585 | ClassTemplateSpecializationDecl *SpecArg | |||
586 | = dyn_cast<ClassTemplateSpecializationDecl>(RecordArg->getDecl()); | |||
587 | if (!SpecArg) { | |||
588 | Info.FirstArg = TemplateArgument(QualType(Param, 0)); | |||
589 | Info.SecondArg = TemplateArgument(Arg); | |||
590 | return Sema::TDK_NonDeducedMismatch; | |||
591 | } | |||
592 | ||||
593 | // Perform template argument deduction for the template name. | |||
594 | if (Sema::TemplateDeductionResult Result | |||
595 | = DeduceTemplateArguments(S, | |||
596 | TemplateParams, | |||
597 | Param->getTemplateName(), | |||
598 | TemplateName(SpecArg->getSpecializedTemplate()), | |||
599 | Info, Deduced)) | |||
600 | return Result; | |||
601 | ||||
602 | // Perform template argument deduction for the template arguments. | |||
603 | return DeduceTemplateArguments(S, TemplateParams, Param->template_arguments(), | |||
604 | SpecArg->getTemplateArgs().asArray(), Info, | |||
605 | Deduced, /*NumberOfArgumentsMustMatch=*/true); | |||
606 | } | |||
607 | ||||
608 | /// Determines whether the given type is an opaque type that | |||
609 | /// might be more qualified when instantiated. | |||
610 | static bool IsPossiblyOpaquelyQualifiedType(QualType T) { | |||
611 | switch (T->getTypeClass()) { | |||
612 | case Type::TypeOfExpr: | |||
613 | case Type::TypeOf: | |||
614 | case Type::DependentName: | |||
615 | case Type::Decltype: | |||
616 | case Type::UnresolvedUsing: | |||
617 | case Type::TemplateTypeParm: | |||
618 | return true; | |||
619 | ||||
620 | case Type::ConstantArray: | |||
621 | case Type::IncompleteArray: | |||
622 | case Type::VariableArray: | |||
623 | case Type::DependentSizedArray: | |||
624 | return IsPossiblyOpaquelyQualifiedType( | |||
625 | cast<ArrayType>(T)->getElementType()); | |||
626 | ||||
627 | default: | |||
628 | return false; | |||
629 | } | |||
630 | } | |||
631 | ||||
632 | /// Helper function to build a TemplateParameter when we don't | |||
633 | /// know its type statically. | |||
634 | static TemplateParameter makeTemplateParameter(Decl *D) { | |||
635 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(D)) | |||
636 | return TemplateParameter(TTP); | |||
637 | if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) | |||
638 | return TemplateParameter(NTTP); | |||
639 | ||||
640 | return TemplateParameter(cast<TemplateTemplateParmDecl>(D)); | |||
641 | } | |||
642 | ||||
643 | /// If \p Param is an expanded parameter pack, get the number of expansions. | |||
644 | static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) { | |||
645 | if (auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) | |||
646 | if (NTTP->isExpandedParameterPack()) | |||
647 | return NTTP->getNumExpansionTypes(); | |||
648 | ||||
649 | if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(Param)) | |||
650 | if (TTP->isExpandedParameterPack()) | |||
651 | return TTP->getNumExpansionTemplateParameters(); | |||
652 | ||||
653 | return None; | |||
654 | } | |||
655 | ||||
656 | /// A pack that we're currently deducing. | |||
657 | struct clang::DeducedPack { | |||
658 | // The index of the pack. | |||
659 | unsigned Index; | |||
660 | ||||
661 | // The old value of the pack before we started deducing it. | |||
662 | DeducedTemplateArgument Saved; | |||
663 | ||||
664 | // A deferred value of this pack from an inner deduction, that couldn't be | |||
665 | // deduced because this deduction hadn't happened yet. | |||
666 | DeducedTemplateArgument DeferredDeduction; | |||
667 | ||||
668 | // The new value of the pack. | |||
669 | SmallVector<DeducedTemplateArgument, 4> New; | |||
670 | ||||
671 | // The outer deduction for this pack, if any. | |||
672 | DeducedPack *Outer = nullptr; | |||
673 | ||||
674 | DeducedPack(unsigned Index) : Index(Index) {} | |||
675 | }; | |||
676 | ||||
677 | namespace { | |||
678 | ||||
679 | /// A scope in which we're performing pack deduction. | |||
680 | class PackDeductionScope { | |||
681 | public: | |||
682 | /// Prepare to deduce the packs named within Pattern. | |||
683 | PackDeductionScope(Sema &S, TemplateParameterList *TemplateParams, | |||
684 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
685 | TemplateDeductionInfo &Info, TemplateArgument Pattern) | |||
686 | : S(S), TemplateParams(TemplateParams), Deduced(Deduced), Info(Info) { | |||
687 | unsigned NumNamedPacks = addPacks(Pattern); | |||
688 | finishConstruction(NumNamedPacks); | |||
689 | } | |||
690 | ||||
691 | /// Prepare to directly deduce arguments of the parameter with index \p Index. | |||
692 | PackDeductionScope(Sema &S, TemplateParameterList *TemplateParams, | |||
693 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
694 | TemplateDeductionInfo &Info, unsigned Index) | |||
695 | : S(S), TemplateParams(TemplateParams), Deduced(Deduced), Info(Info) { | |||
696 | addPack(Index); | |||
697 | finishConstruction(1); | |||
698 | } | |||
699 | ||||
700 | private: | |||
701 | void addPack(unsigned Index) { | |||
702 | // Save the deduced template argument for the parameter pack expanded | |||
703 | // by this pack expansion, then clear out the deduction. | |||
704 | DeducedPack Pack(Index); | |||
705 | Pack.Saved = Deduced[Index]; | |||
706 | Deduced[Index] = TemplateArgument(); | |||
707 | ||||
708 | // FIXME: What if we encounter multiple packs with different numbers of | |||
709 | // pre-expanded expansions? (This should already have been diagnosed | |||
710 | // during substitution.) | |||
711 | if (Optional<unsigned> ExpandedPackExpansions = | |||
712 | getExpandedPackSize(TemplateParams->getParam(Index))) | |||
713 | FixedNumExpansions = ExpandedPackExpansions; | |||
714 | ||||
715 | Packs.push_back(Pack); | |||
716 | } | |||
717 | ||||
718 | unsigned addPacks(TemplateArgument Pattern) { | |||
719 | // Compute the set of template parameter indices that correspond to | |||
720 | // parameter packs expanded by the pack expansion. | |||
721 | llvm::SmallBitVector SawIndices(TemplateParams->size()); | |||
722 | ||||
723 | auto AddPack = [&](unsigned Index) { | |||
724 | if (SawIndices[Index]) | |||
725 | return; | |||
726 | SawIndices[Index] = true; | |||
727 | addPack(Index); | |||
728 | }; | |||
729 | ||||
730 | // First look for unexpanded packs in the pattern. | |||
731 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; | |||
732 | S.collectUnexpandedParameterPacks(Pattern, Unexpanded); | |||
733 | for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { | |||
734 | unsigned Depth, Index; | |||
735 | std::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); | |||
736 | if (Depth == Info.getDeducedDepth()) | |||
737 | AddPack(Index); | |||
738 | } | |||
739 | assert(!Packs.empty() && "Pack expansion without unexpanded packs?")((!Packs.empty() && "Pack expansion without unexpanded packs?" ) ? static_cast<void> (0) : __assert_fail ("!Packs.empty() && \"Pack expansion without unexpanded packs?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 739, __PRETTY_FUNCTION__)); | |||
740 | ||||
741 | unsigned NumNamedPacks = Packs.size(); | |||
742 | ||||
743 | // We can also have deduced template parameters that do not actually | |||
744 | // appear in the pattern, but can be deduced by it (the type of a non-type | |||
745 | // template parameter pack, in particular). These won't have prevented us | |||
746 | // from partially expanding the pack. | |||
747 | llvm::SmallBitVector Used(TemplateParams->size()); | |||
748 | MarkUsedTemplateParameters(S.Context, Pattern, /*OnlyDeduced*/true, | |||
749 | Info.getDeducedDepth(), Used); | |||
750 | for (int Index = Used.find_first(); Index != -1; | |||
751 | Index = Used.find_next(Index)) | |||
752 | if (TemplateParams->getParam(Index)->isParameterPack()) | |||
753 | AddPack(Index); | |||
754 | ||||
755 | return NumNamedPacks; | |||
756 | } | |||
| ||||
757 | ||||
758 | void finishConstruction(unsigned NumNamedPacks) { | |||
759 | // Dig out the partially-substituted pack, if there is one. | |||
760 | const TemplateArgument *PartialPackArgs = nullptr; | |||
761 | unsigned NumPartialPackArgs = 0; | |||
762 | std::pair<unsigned, unsigned> PartialPackDepthIndex(-1u, -1u); | |||
763 | if (auto *Scope = S.CurrentInstantiationScope) | |||
764 | if (auto *Partial = Scope->getPartiallySubstitutedPack( | |||
765 | &PartialPackArgs, &NumPartialPackArgs)) | |||
766 | PartialPackDepthIndex = getDepthAndIndex(Partial); | |||
767 | ||||
768 | // This pack expansion will have been partially or fully expanded if | |||
769 | // it only names explicitly-specified parameter packs (including the | |||
770 | // partially-substituted one, if any). | |||
771 | bool IsExpanded = true; | |||
772 | for (unsigned I = 0; I != NumNamedPacks; ++I) { | |||
773 | if (Packs[I].Index >= Info.getNumExplicitArgs()) { | |||
774 | IsExpanded = false; | |||
775 | IsPartiallyExpanded = false; | |||
776 | break; | |||
777 | } | |||
778 | if (PartialPackDepthIndex == | |||
779 | std::make_pair(Info.getDeducedDepth(), Packs[I].Index)) { | |||
780 | IsPartiallyExpanded = true; | |||
781 | } | |||
782 | } | |||
783 | ||||
784 | // Skip over the pack elements that were expanded into separate arguments. | |||
785 | // If we partially expanded, this is the number of partial arguments. | |||
786 | if (IsPartiallyExpanded) | |||
787 | PackElements += NumPartialPackArgs; | |||
788 | else if (IsExpanded) | |||
789 | PackElements += *FixedNumExpansions; | |||
790 | ||||
791 | for (auto &Pack : Packs) { | |||
792 | if (Info.PendingDeducedPacks.size() > Pack.Index) | |||
793 | Pack.Outer = Info.PendingDeducedPacks[Pack.Index]; | |||
794 | else | |||
795 | Info.PendingDeducedPacks.resize(Pack.Index + 1); | |||
796 | Info.PendingDeducedPacks[Pack.Index] = &Pack; | |||
797 | ||||
798 | if (PartialPackDepthIndex == | |||
799 | std::make_pair(Info.getDeducedDepth(), Pack.Index)) { | |||
800 | Pack.New.append(PartialPackArgs, PartialPackArgs + NumPartialPackArgs); | |||
801 | // We pre-populate the deduced value of the partially-substituted | |||
802 | // pack with the specified value. This is not entirely correct: the | |||
803 | // value is supposed to have been substituted, not deduced, but the | |||
804 | // cases where this is observable require an exact type match anyway. | |||
805 | // | |||
806 | // FIXME: If we could represent a "depth i, index j, pack elem k" | |||
807 | // parameter, we could substitute the partially-substituted pack | |||
808 | // everywhere and avoid this. | |||
809 | if (!IsPartiallyExpanded) | |||
810 | Deduced[Pack.Index] = Pack.New[PackElements]; | |||
811 | } | |||
812 | } | |||
813 | } | |||
814 | ||||
815 | public: | |||
816 | ~PackDeductionScope() { | |||
817 | for (auto &Pack : Packs) | |||
818 | Info.PendingDeducedPacks[Pack.Index] = Pack.Outer; | |||
819 | } | |||
820 | ||||
821 | /// Determine whether this pack has already been partially expanded into a | |||
822 | /// sequence of (prior) function parameters / template arguments. | |||
823 | bool isPartiallyExpanded() { return IsPartiallyExpanded; } | |||
824 | ||||
825 | /// Determine whether this pack expansion scope has a known, fixed arity. | |||
826 | /// This happens if it involves a pack from an outer template that has | |||
827 | /// (notionally) already been expanded. | |||
828 | bool hasFixedArity() { return FixedNumExpansions.hasValue(); } | |||
829 | ||||
830 | /// Determine whether the next element of the argument is still part of this | |||
831 | /// pack. This is the case unless the pack is already expanded to a fixed | |||
832 | /// length. | |||
833 | bool hasNextElement() { | |||
834 | return !FixedNumExpansions || *FixedNumExpansions > PackElements; | |||
835 | } | |||
836 | ||||
837 | /// Move to deducing the next element in each pack that is being deduced. | |||
838 | void nextPackElement() { | |||
839 | // Capture the deduced template arguments for each parameter pack expanded | |||
840 | // by this pack expansion, add them to the list of arguments we've deduced | |||
841 | // for that pack, then clear out the deduced argument. | |||
842 | for (auto &Pack : Packs) { | |||
843 | DeducedTemplateArgument &DeducedArg = Deduced[Pack.Index]; | |||
844 | if (!Pack.New.empty() || !DeducedArg.isNull()) { | |||
845 | while (Pack.New.size() < PackElements) | |||
846 | Pack.New.push_back(DeducedTemplateArgument()); | |||
847 | if (Pack.New.size() == PackElements) | |||
848 | Pack.New.push_back(DeducedArg); | |||
849 | else | |||
850 | Pack.New[PackElements] = DeducedArg; | |||
851 | DeducedArg = Pack.New.size() > PackElements + 1 | |||
852 | ? Pack.New[PackElements + 1] | |||
853 | : DeducedTemplateArgument(); | |||
854 | } | |||
855 | } | |||
856 | ++PackElements; | |||
857 | } | |||
858 | ||||
859 | /// Finish template argument deduction for a set of argument packs, | |||
860 | /// producing the argument packs and checking for consistency with prior | |||
861 | /// deductions. | |||
862 | Sema::TemplateDeductionResult | |||
863 | finish(bool TreatNoDeductionsAsNonDeduced = true) { | |||
864 | // Build argument packs for each of the parameter packs expanded by this | |||
865 | // pack expansion. | |||
866 | for (auto &Pack : Packs) { | |||
867 | // Put back the old value for this pack. | |||
868 | Deduced[Pack.Index] = Pack.Saved; | |||
869 | ||||
870 | // If we are deducing the size of this pack even if we didn't deduce any | |||
871 | // values for it, then make sure we build a pack of the right size. | |||
872 | // FIXME: Should we always deduce the size, even if the pack appears in | |||
873 | // a non-deduced context? | |||
874 | if (!TreatNoDeductionsAsNonDeduced) | |||
875 | Pack.New.resize(PackElements); | |||
876 | ||||
877 | // Build or find a new value for this pack. | |||
878 | DeducedTemplateArgument NewPack; | |||
879 | if (PackElements && Pack.New.empty()) { | |||
880 | if (Pack.DeferredDeduction.isNull()) { | |||
881 | // We were not able to deduce anything for this parameter pack | |||
882 | // (because it only appeared in non-deduced contexts), so just | |||
883 | // restore the saved argument pack. | |||
884 | continue; | |||
885 | } | |||
886 | ||||
887 | NewPack = Pack.DeferredDeduction; | |||
888 | Pack.DeferredDeduction = TemplateArgument(); | |||
889 | } else if (Pack.New.empty()) { | |||
890 | // If we deduced an empty argument pack, create it now. | |||
891 | NewPack = DeducedTemplateArgument(TemplateArgument::getEmptyPack()); | |||
892 | } else { | |||
893 | TemplateArgument *ArgumentPack = | |||
894 | new (S.Context) TemplateArgument[Pack.New.size()]; | |||
895 | std::copy(Pack.New.begin(), Pack.New.end(), ArgumentPack); | |||
896 | NewPack = DeducedTemplateArgument( | |||
897 | TemplateArgument(llvm::makeArrayRef(ArgumentPack, Pack.New.size())), | |||
898 | // FIXME: This is wrong, it's possible that some pack elements are | |||
899 | // deduced from an array bound and others are not: | |||
900 | // template<typename ...T, T ...V> void g(const T (&...p)[V]); | |||
901 | // g({1, 2, 3}, {{}, {}}); | |||
902 | // ... should deduce T = {int, size_t (from array bound)}. | |||
903 | Pack.New[0].wasDeducedFromArrayBound()); | |||
904 | } | |||
905 | ||||
906 | // Pick where we're going to put the merged pack. | |||
907 | DeducedTemplateArgument *Loc; | |||
908 | if (Pack.Outer) { | |||
909 | if (Pack.Outer->DeferredDeduction.isNull()) { | |||
910 | // Defer checking this pack until we have a complete pack to compare | |||
911 | // it against. | |||
912 | Pack.Outer->DeferredDeduction = NewPack; | |||
913 | continue; | |||
914 | } | |||
915 | Loc = &Pack.Outer->DeferredDeduction; | |||
916 | } else { | |||
917 | Loc = &Deduced[Pack.Index]; | |||
918 | } | |||
919 | ||||
920 | // Check the new pack matches any previous value. | |||
921 | DeducedTemplateArgument OldPack = *Loc; | |||
922 | DeducedTemplateArgument Result = | |||
923 | checkDeducedTemplateArguments(S.Context, OldPack, NewPack); | |||
924 | ||||
925 | // If we deferred a deduction of this pack, check that one now too. | |||
926 | if (!Result.isNull() && !Pack.DeferredDeduction.isNull()) { | |||
927 | OldPack = Result; | |||
928 | NewPack = Pack.DeferredDeduction; | |||
929 | Result = checkDeducedTemplateArguments(S.Context, OldPack, NewPack); | |||
930 | } | |||
931 | ||||
932 | NamedDecl *Param = TemplateParams->getParam(Pack.Index); | |||
933 | if (Result.isNull()) { | |||
934 | Info.Param = makeTemplateParameter(Param); | |||
935 | Info.FirstArg = OldPack; | |||
936 | Info.SecondArg = NewPack; | |||
937 | return Sema::TDK_Inconsistent; | |||
938 | } | |||
939 | ||||
940 | // If we have a pre-expanded pack and we didn't deduce enough elements | |||
941 | // for it, fail deduction. | |||
942 | if (Optional<unsigned> Expansions = getExpandedPackSize(Param)) { | |||
943 | if (*Expansions != PackElements) { | |||
944 | Info.Param = makeTemplateParameter(Param); | |||
945 | Info.FirstArg = Result; | |||
946 | return Sema::TDK_IncompletePack; | |||
947 | } | |||
948 | } | |||
949 | ||||
950 | *Loc = Result; | |||
951 | } | |||
952 | ||||
953 | return Sema::TDK_Success; | |||
954 | } | |||
955 | ||||
956 | private: | |||
957 | Sema &S; | |||
958 | TemplateParameterList *TemplateParams; | |||
959 | SmallVectorImpl<DeducedTemplateArgument> &Deduced; | |||
960 | TemplateDeductionInfo &Info; | |||
961 | unsigned PackElements = 0; | |||
962 | bool IsPartiallyExpanded = false; | |||
963 | /// The number of expansions, if we have a fully-expanded pack in this scope. | |||
964 | Optional<unsigned> FixedNumExpansions; | |||
965 | ||||
966 | SmallVector<DeducedPack, 2> Packs; | |||
967 | }; | |||
968 | ||||
969 | } // namespace | |||
970 | ||||
971 | /// Deduce the template arguments by comparing the list of parameter | |||
972 | /// types to the list of argument types, as in the parameter-type-lists of | |||
973 | /// function types (C++ [temp.deduct.type]p10). | |||
974 | /// | |||
975 | /// \param S The semantic analysis object within which we are deducing | |||
976 | /// | |||
977 | /// \param TemplateParams The template parameters that we are deducing | |||
978 | /// | |||
979 | /// \param Params The list of parameter types | |||
980 | /// | |||
981 | /// \param NumParams The number of types in \c Params | |||
982 | /// | |||
983 | /// \param Args The list of argument types | |||
984 | /// | |||
985 | /// \param NumArgs The number of types in \c Args | |||
986 | /// | |||
987 | /// \param Info information about the template argument deduction itself | |||
988 | /// | |||
989 | /// \param Deduced the deduced template arguments | |||
990 | /// | |||
991 | /// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe | |||
992 | /// how template argument deduction is performed. | |||
993 | /// | |||
994 | /// \param PartialOrdering If true, we are performing template argument | |||
995 | /// deduction for during partial ordering for a call | |||
996 | /// (C++0x [temp.deduct.partial]). | |||
997 | /// | |||
998 | /// \returns the result of template argument deduction so far. Note that a | |||
999 | /// "success" result means that template argument deduction has not yet failed, | |||
1000 | /// but it may still fail, later, for other reasons. | |||
1001 | static Sema::TemplateDeductionResult | |||
1002 | DeduceTemplateArguments(Sema &S, | |||
1003 | TemplateParameterList *TemplateParams, | |||
1004 | const QualType *Params, unsigned NumParams, | |||
1005 | const QualType *Args, unsigned NumArgs, | |||
1006 | TemplateDeductionInfo &Info, | |||
1007 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
1008 | unsigned TDF, | |||
1009 | bool PartialOrdering = false) { | |||
1010 | // C++0x [temp.deduct.type]p10: | |||
1011 | // Similarly, if P has a form that contains (T), then each parameter type | |||
1012 | // Pi of the respective parameter-type- list of P is compared with the | |||
1013 | // corresponding parameter type Ai of the corresponding parameter-type-list | |||
1014 | // of A. [...] | |||
1015 | unsigned ArgIdx = 0, ParamIdx = 0; | |||
1016 | for (; ParamIdx != NumParams; ++ParamIdx) { | |||
1017 | // Check argument types. | |||
1018 | const PackExpansionType *Expansion | |||
1019 | = dyn_cast<PackExpansionType>(Params[ParamIdx]); | |||
1020 | if (!Expansion) { | |||
1021 | // Simple case: compare the parameter and argument types at this point. | |||
1022 | ||||
1023 | // Make sure we have an argument. | |||
1024 | if (ArgIdx >= NumArgs) | |||
1025 | return Sema::TDK_MiscellaneousDeductionFailure; | |||
1026 | ||||
1027 | if (isa<PackExpansionType>(Args[ArgIdx])) { | |||
1028 | // C++0x [temp.deduct.type]p22: | |||
1029 | // If the original function parameter associated with A is a function | |||
1030 | // parameter pack and the function parameter associated with P is not | |||
1031 | // a function parameter pack, then template argument deduction fails. | |||
1032 | return Sema::TDK_MiscellaneousDeductionFailure; | |||
1033 | } | |||
1034 | ||||
1035 | if (Sema::TemplateDeductionResult Result | |||
1036 | = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1037 | Params[ParamIdx], Args[ArgIdx], | |||
1038 | Info, Deduced, TDF, | |||
1039 | PartialOrdering)) | |||
1040 | return Result; | |||
1041 | ||||
1042 | ++ArgIdx; | |||
1043 | continue; | |||
1044 | } | |||
1045 | ||||
1046 | // C++0x [temp.deduct.type]p10: | |||
1047 | // If the parameter-declaration corresponding to Pi is a function | |||
1048 | // parameter pack, then the type of its declarator- id is compared with | |||
1049 | // each remaining parameter type in the parameter-type-list of A. Each | |||
1050 | // comparison deduces template arguments for subsequent positions in the | |||
1051 | // template parameter packs expanded by the function parameter pack. | |||
1052 | ||||
1053 | QualType Pattern = Expansion->getPattern(); | |||
1054 | PackDeductionScope PackScope(S, TemplateParams, Deduced, Info, Pattern); | |||
1055 | ||||
1056 | // A pack scope with fixed arity is not really a pack any more, so is not | |||
1057 | // a non-deduced context. | |||
1058 | if (ParamIdx + 1 == NumParams || PackScope.hasFixedArity()) { | |||
1059 | for (; ArgIdx < NumArgs && PackScope.hasNextElement(); ++ArgIdx) { | |||
1060 | // Deduce template arguments from the pattern. | |||
1061 | if (Sema::TemplateDeductionResult Result | |||
1062 | = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, Pattern, | |||
1063 | Args[ArgIdx], Info, Deduced, | |||
1064 | TDF, PartialOrdering)) | |||
1065 | return Result; | |||
1066 | ||||
1067 | PackScope.nextPackElement(); | |||
1068 | } | |||
1069 | } else { | |||
1070 | // C++0x [temp.deduct.type]p5: | |||
1071 | // The non-deduced contexts are: | |||
1072 | // - A function parameter pack that does not occur at the end of the | |||
1073 | // parameter-declaration-clause. | |||
1074 | // | |||
1075 | // FIXME: There is no wording to say what we should do in this case. We | |||
1076 | // choose to resolve this by applying the same rule that is applied for a | |||
1077 | // function call: that is, deduce all contained packs to their | |||
1078 | // explicitly-specified values (or to <> if there is no such value). | |||
1079 | // | |||
1080 | // This is seemingly-arbitrarily different from the case of a template-id | |||
1081 | // with a non-trailing pack-expansion in its arguments, which renders the | |||
1082 | // entire template-argument-list a non-deduced context. | |||
1083 | ||||
1084 | // If the parameter type contains an explicitly-specified pack that we | |||
1085 | // could not expand, skip the number of parameters notionally created | |||
1086 | // by the expansion. | |||
1087 | Optional<unsigned> NumExpansions = Expansion->getNumExpansions(); | |||
1088 | if (NumExpansions && !PackScope.isPartiallyExpanded()) { | |||
1089 | for (unsigned I = 0; I != *NumExpansions && ArgIdx < NumArgs; | |||
1090 | ++I, ++ArgIdx) | |||
1091 | PackScope.nextPackElement(); | |||
1092 | } | |||
1093 | } | |||
1094 | ||||
1095 | // Build argument packs for each of the parameter packs expanded by this | |||
1096 | // pack expansion. | |||
1097 | if (auto Result = PackScope.finish()) | |||
1098 | return Result; | |||
1099 | } | |||
1100 | ||||
1101 | // Make sure we don't have any extra arguments. | |||
1102 | if (ArgIdx < NumArgs) | |||
1103 | return Sema::TDK_MiscellaneousDeductionFailure; | |||
1104 | ||||
1105 | return Sema::TDK_Success; | |||
1106 | } | |||
1107 | ||||
1108 | /// Determine whether the parameter has qualifiers that the argument | |||
1109 | /// lacks. Put another way, determine whether there is no way to add | |||
1110 | /// a deduced set of qualifiers to the ParamType that would result in | |||
1111 | /// its qualifiers matching those of the ArgType. | |||
1112 | static bool hasInconsistentOrSupersetQualifiersOf(QualType ParamType, | |||
1113 | QualType ArgType) { | |||
1114 | Qualifiers ParamQs = ParamType.getQualifiers(); | |||
1115 | Qualifiers ArgQs = ArgType.getQualifiers(); | |||
1116 | ||||
1117 | if (ParamQs == ArgQs) | |||
1118 | return false; | |||
1119 | ||||
1120 | // Mismatched (but not missing) Objective-C GC attributes. | |||
1121 | if (ParamQs.getObjCGCAttr() != ArgQs.getObjCGCAttr() && | |||
1122 | ParamQs.hasObjCGCAttr()) | |||
1123 | return true; | |||
1124 | ||||
1125 | // Mismatched (but not missing) address spaces. | |||
1126 | if (ParamQs.getAddressSpace() != ArgQs.getAddressSpace() && | |||
1127 | ParamQs.hasAddressSpace()) | |||
1128 | return true; | |||
1129 | ||||
1130 | // Mismatched (but not missing) Objective-C lifetime qualifiers. | |||
1131 | if (ParamQs.getObjCLifetime() != ArgQs.getObjCLifetime() && | |||
1132 | ParamQs.hasObjCLifetime()) | |||
1133 | return true; | |||
1134 | ||||
1135 | // CVR qualifiers inconsistent or a superset. | |||
1136 | return (ParamQs.getCVRQualifiers() & ~ArgQs.getCVRQualifiers()) != 0; | |||
1137 | } | |||
1138 | ||||
1139 | /// Compare types for equality with respect to possibly compatible | |||
1140 | /// function types (noreturn adjustment, implicit calling conventions). If any | |||
1141 | /// of parameter and argument is not a function, just perform type comparison. | |||
1142 | /// | |||
1143 | /// \param Param the template parameter type. | |||
1144 | /// | |||
1145 | /// \param Arg the argument type. | |||
1146 | bool Sema::isSameOrCompatibleFunctionType(CanQualType Param, | |||
1147 | CanQualType Arg) { | |||
1148 | const FunctionType *ParamFunction = Param->getAs<FunctionType>(), | |||
1149 | *ArgFunction = Arg->getAs<FunctionType>(); | |||
1150 | ||||
1151 | // Just compare if not functions. | |||
1152 | if (!ParamFunction || !ArgFunction) | |||
1153 | return Param == Arg; | |||
1154 | ||||
1155 | // Noreturn and noexcept adjustment. | |||
1156 | QualType AdjustedParam; | |||
1157 | if (IsFunctionConversion(Param, Arg, AdjustedParam)) | |||
1158 | return Arg == Context.getCanonicalType(AdjustedParam); | |||
1159 | ||||
1160 | // FIXME: Compatible calling conventions. | |||
1161 | ||||
1162 | return Param == Arg; | |||
1163 | } | |||
1164 | ||||
1165 | /// Get the index of the first template parameter that was originally from the | |||
1166 | /// innermost template-parameter-list. This is 0 except when we concatenate | |||
1167 | /// the template parameter lists of a class template and a constructor template | |||
1168 | /// when forming an implicit deduction guide. | |||
1169 | static unsigned getFirstInnerIndex(FunctionTemplateDecl *FTD) { | |||
1170 | auto *Guide = dyn_cast<CXXDeductionGuideDecl>(FTD->getTemplatedDecl()); | |||
1171 | if (!Guide || !Guide->isImplicit()) | |||
1172 | return 0; | |||
1173 | return Guide->getDeducedTemplate()->getTemplateParameters()->size(); | |||
1174 | } | |||
1175 | ||||
1176 | /// Determine whether a type denotes a forwarding reference. | |||
1177 | static bool isForwardingReference(QualType Param, unsigned FirstInnerIndex) { | |||
1178 | // C++1z [temp.deduct.call]p3: | |||
1179 | // A forwarding reference is an rvalue reference to a cv-unqualified | |||
1180 | // template parameter that does not represent a template parameter of a | |||
1181 | // class template. | |||
1182 | if (auto *ParamRef = Param->getAs<RValueReferenceType>()) { | |||
1183 | if (ParamRef->getPointeeType().getQualifiers()) | |||
1184 | return false; | |||
1185 | auto *TypeParm = ParamRef->getPointeeType()->getAs<TemplateTypeParmType>(); | |||
1186 | return TypeParm && TypeParm->getIndex() >= FirstInnerIndex; | |||
1187 | } | |||
1188 | return false; | |||
1189 | } | |||
1190 | ||||
1191 | /// Deduce the template arguments by comparing the parameter type and | |||
1192 | /// the argument type (C++ [temp.deduct.type]). | |||
1193 | /// | |||
1194 | /// \param S the semantic analysis object within which we are deducing | |||
1195 | /// | |||
1196 | /// \param TemplateParams the template parameters that we are deducing | |||
1197 | /// | |||
1198 | /// \param ParamIn the parameter type | |||
1199 | /// | |||
1200 | /// \param ArgIn the argument type | |||
1201 | /// | |||
1202 | /// \param Info information about the template argument deduction itself | |||
1203 | /// | |||
1204 | /// \param Deduced the deduced template arguments | |||
1205 | /// | |||
1206 | /// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe | |||
1207 | /// how template argument deduction is performed. | |||
1208 | /// | |||
1209 | /// \param PartialOrdering Whether we're performing template argument deduction | |||
1210 | /// in the context of partial ordering (C++0x [temp.deduct.partial]). | |||
1211 | /// | |||
1212 | /// \returns the result of template argument deduction so far. Note that a | |||
1213 | /// "success" result means that template argument deduction has not yet failed, | |||
1214 | /// but it may still fail, later, for other reasons. | |||
1215 | static Sema::TemplateDeductionResult | |||
1216 | DeduceTemplateArgumentsByTypeMatch(Sema &S, | |||
1217 | TemplateParameterList *TemplateParams, | |||
1218 | QualType ParamIn, QualType ArgIn, | |||
1219 | TemplateDeductionInfo &Info, | |||
1220 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
1221 | unsigned TDF, | |||
1222 | bool PartialOrdering, | |||
1223 | bool DeducedFromArrayBound) { | |||
1224 | // We only want to look at the canonical types, since typedefs and | |||
1225 | // sugar are not part of template argument deduction. | |||
1226 | QualType Param = S.Context.getCanonicalType(ParamIn); | |||
1227 | QualType Arg = S.Context.getCanonicalType(ArgIn); | |||
1228 | ||||
1229 | // If the argument type is a pack expansion, look at its pattern. | |||
1230 | // This isn't explicitly called out | |||
1231 | if (const PackExpansionType *ArgExpansion | |||
1232 | = dyn_cast<PackExpansionType>(Arg)) | |||
1233 | Arg = ArgExpansion->getPattern(); | |||
1234 | ||||
1235 | if (PartialOrdering) { | |||
1236 | // C++11 [temp.deduct.partial]p5: | |||
1237 | // Before the partial ordering is done, certain transformations are | |||
1238 | // performed on the types used for partial ordering: | |||
1239 | // - If P is a reference type, P is replaced by the type referred to. | |||
1240 | const ReferenceType *ParamRef = Param->getAs<ReferenceType>(); | |||
1241 | if (ParamRef) | |||
1242 | Param = ParamRef->getPointeeType(); | |||
1243 | ||||
1244 | // - If A is a reference type, A is replaced by the type referred to. | |||
1245 | const ReferenceType *ArgRef = Arg->getAs<ReferenceType>(); | |||
1246 | if (ArgRef) | |||
1247 | Arg = ArgRef->getPointeeType(); | |||
1248 | ||||
1249 | if (ParamRef && ArgRef && S.Context.hasSameUnqualifiedType(Param, Arg)) { | |||
1250 | // C++11 [temp.deduct.partial]p9: | |||
1251 | // If, for a given type, deduction succeeds in both directions (i.e., | |||
1252 | // the types are identical after the transformations above) and both | |||
1253 | // P and A were reference types [...]: | |||
1254 | // - if [one type] was an lvalue reference and [the other type] was | |||
1255 | // not, [the other type] is not considered to be at least as | |||
1256 | // specialized as [the first type] | |||
1257 | // - if [one type] is more cv-qualified than [the other type], | |||
1258 | // [the other type] is not considered to be at least as specialized | |||
1259 | // as [the first type] | |||
1260 | // Objective-C ARC adds: | |||
1261 | // - [one type] has non-trivial lifetime, [the other type] has | |||
1262 | // __unsafe_unretained lifetime, and the types are otherwise | |||
1263 | // identical | |||
1264 | // | |||
1265 | // A is "considered to be at least as specialized" as P iff deduction | |||
1266 | // succeeds, so we model this as a deduction failure. Note that | |||
1267 | // [the first type] is P and [the other type] is A here; the standard | |||
1268 | // gets this backwards. | |||
1269 | Qualifiers ParamQuals = Param.getQualifiers(); | |||
1270 | Qualifiers ArgQuals = Arg.getQualifiers(); | |||
1271 | if ((ParamRef->isLValueReferenceType() && | |||
1272 | !ArgRef->isLValueReferenceType()) || | |||
1273 | ParamQuals.isStrictSupersetOf(ArgQuals) || | |||
1274 | (ParamQuals.hasNonTrivialObjCLifetime() && | |||
1275 | ArgQuals.getObjCLifetime() == Qualifiers::OCL_ExplicitNone && | |||
1276 | ParamQuals.withoutObjCLifetime() == | |||
1277 | ArgQuals.withoutObjCLifetime())) { | |||
1278 | Info.FirstArg = TemplateArgument(ParamIn); | |||
1279 | Info.SecondArg = TemplateArgument(ArgIn); | |||
1280 | return Sema::TDK_NonDeducedMismatch; | |||
1281 | } | |||
1282 | } | |||
1283 | ||||
1284 | // C++11 [temp.deduct.partial]p7: | |||
1285 | // Remove any top-level cv-qualifiers: | |||
1286 | // - If P is a cv-qualified type, P is replaced by the cv-unqualified | |||
1287 | // version of P. | |||
1288 | Param = Param.getUnqualifiedType(); | |||
1289 | // - If A is a cv-qualified type, A is replaced by the cv-unqualified | |||
1290 | // version of A. | |||
1291 | Arg = Arg.getUnqualifiedType(); | |||
1292 | } else { | |||
1293 | // C++0x [temp.deduct.call]p4 bullet 1: | |||
1294 | // - If the original P is a reference type, the deduced A (i.e., the type | |||
1295 | // referred to by the reference) can be more cv-qualified than the | |||
1296 | // transformed A. | |||
1297 | if (TDF & TDF_ParamWithReferenceType) { | |||
1298 | Qualifiers Quals; | |||
1299 | QualType UnqualParam = S.Context.getUnqualifiedArrayType(Param, Quals); | |||
1300 | Quals.setCVRQualifiers(Quals.getCVRQualifiers() & | |||
1301 | Arg.getCVRQualifiers()); | |||
1302 | Param = S.Context.getQualifiedType(UnqualParam, Quals); | |||
1303 | } | |||
1304 | ||||
1305 | if ((TDF & TDF_TopLevelParameterTypeList) && !Param->isFunctionType()) { | |||
1306 | // C++0x [temp.deduct.type]p10: | |||
1307 | // If P and A are function types that originated from deduction when | |||
1308 | // taking the address of a function template (14.8.2.2) or when deducing | |||
1309 | // template arguments from a function declaration (14.8.2.6) and Pi and | |||
1310 | // Ai are parameters of the top-level parameter-type-list of P and A, | |||
1311 | // respectively, Pi is adjusted if it is a forwarding reference and Ai | |||
1312 | // is an lvalue reference, in | |||
1313 | // which case the type of Pi is changed to be the template parameter | |||
1314 | // type (i.e., T&& is changed to simply T). [ Note: As a result, when | |||
1315 | // Pi is T&& and Ai is X&, the adjusted Pi will be T, causing T to be | |||
1316 | // deduced as X&. - end note ] | |||
1317 | TDF &= ~TDF_TopLevelParameterTypeList; | |||
1318 | if (isForwardingReference(Param, 0) && Arg->isLValueReferenceType()) | |||
1319 | Param = Param->getPointeeType(); | |||
1320 | } | |||
1321 | } | |||
1322 | ||||
1323 | // C++ [temp.deduct.type]p9: | |||
1324 | // A template type argument T, a template template argument TT or a | |||
1325 | // template non-type argument i can be deduced if P and A have one of | |||
1326 | // the following forms: | |||
1327 | // | |||
1328 | // T | |||
1329 | // cv-list T | |||
1330 | if (const TemplateTypeParmType *TemplateTypeParm | |||
1331 | = Param->getAs<TemplateTypeParmType>()) { | |||
1332 | // Just skip any attempts to deduce from a placeholder type or a parameter | |||
1333 | // at a different depth. | |||
1334 | if (Arg->isPlaceholderType() || | |||
1335 | Info.getDeducedDepth() != TemplateTypeParm->getDepth()) | |||
1336 | return Sema::TDK_Success; | |||
1337 | ||||
1338 | unsigned Index = TemplateTypeParm->getIndex(); | |||
1339 | bool RecanonicalizeArg = false; | |||
1340 | ||||
1341 | // If the argument type is an array type, move the qualifiers up to the | |||
1342 | // top level, so they can be matched with the qualifiers on the parameter. | |||
1343 | if (isa<ArrayType>(Arg)) { | |||
1344 | Qualifiers Quals; | |||
1345 | Arg = S.Context.getUnqualifiedArrayType(Arg, Quals); | |||
1346 | if (Quals) { | |||
1347 | Arg = S.Context.getQualifiedType(Arg, Quals); | |||
1348 | RecanonicalizeArg = true; | |||
1349 | } | |||
1350 | } | |||
1351 | ||||
1352 | // The argument type can not be less qualified than the parameter | |||
1353 | // type. | |||
1354 | if (!(TDF & TDF_IgnoreQualifiers) && | |||
1355 | hasInconsistentOrSupersetQualifiersOf(Param, Arg)) { | |||
1356 | Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); | |||
1357 | Info.FirstArg = TemplateArgument(Param); | |||
1358 | Info.SecondArg = TemplateArgument(Arg); | |||
1359 | return Sema::TDK_Underqualified; | |||
1360 | } | |||
1361 | ||||
1362 | // Do not match a function type with a cv-qualified type. | |||
1363 | // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1584 | |||
1364 | if (Arg->isFunctionType() && Param.hasQualifiers()) { | |||
1365 | return Sema::TDK_NonDeducedMismatch; | |||
1366 | } | |||
1367 | ||||
1368 | assert(TemplateTypeParm->getDepth() == Info.getDeducedDepth() &&((TemplateTypeParm->getDepth() == Info.getDeducedDepth() && "saw template type parameter with wrong depth") ? static_cast <void> (0) : __assert_fail ("TemplateTypeParm->getDepth() == Info.getDeducedDepth() && \"saw template type parameter with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1369, __PRETTY_FUNCTION__)) | |||
1369 | "saw template type parameter with wrong depth")((TemplateTypeParm->getDepth() == Info.getDeducedDepth() && "saw template type parameter with wrong depth") ? static_cast <void> (0) : __assert_fail ("TemplateTypeParm->getDepth() == Info.getDeducedDepth() && \"saw template type parameter with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1369, __PRETTY_FUNCTION__)); | |||
1370 | assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function")((Arg != S.Context.OverloadTy && "Unresolved overloaded function" ) ? static_cast<void> (0) : __assert_fail ("Arg != S.Context.OverloadTy && \"Unresolved overloaded function\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1370, __PRETTY_FUNCTION__)); | |||
1371 | QualType DeducedType = Arg; | |||
1372 | ||||
1373 | // Remove any qualifiers on the parameter from the deduced type. | |||
1374 | // We checked the qualifiers for consistency above. | |||
1375 | Qualifiers DeducedQs = DeducedType.getQualifiers(); | |||
1376 | Qualifiers ParamQs = Param.getQualifiers(); | |||
1377 | DeducedQs.removeCVRQualifiers(ParamQs.getCVRQualifiers()); | |||
1378 | if (ParamQs.hasObjCGCAttr()) | |||
1379 | DeducedQs.removeObjCGCAttr(); | |||
1380 | if (ParamQs.hasAddressSpace()) | |||
1381 | DeducedQs.removeAddressSpace(); | |||
1382 | if (ParamQs.hasObjCLifetime()) | |||
1383 | DeducedQs.removeObjCLifetime(); | |||
1384 | ||||
1385 | // Objective-C ARC: | |||
1386 | // If template deduction would produce a lifetime qualifier on a type | |||
1387 | // that is not a lifetime type, template argument deduction fails. | |||
1388 | if (ParamQs.hasObjCLifetime() && !DeducedType->isObjCLifetimeType() && | |||
1389 | !DeducedType->isDependentType()) { | |||
1390 | Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); | |||
1391 | Info.FirstArg = TemplateArgument(Param); | |||
1392 | Info.SecondArg = TemplateArgument(Arg); | |||
1393 | return Sema::TDK_Underqualified; | |||
1394 | } | |||
1395 | ||||
1396 | // Objective-C ARC: | |||
1397 | // If template deduction would produce an argument type with lifetime type | |||
1398 | // but no lifetime qualifier, the __strong lifetime qualifier is inferred. | |||
1399 | if (S.getLangOpts().ObjCAutoRefCount && | |||
1400 | DeducedType->isObjCLifetimeType() && | |||
1401 | !DeducedQs.hasObjCLifetime()) | |||
1402 | DeducedQs.setObjCLifetime(Qualifiers::OCL_Strong); | |||
1403 | ||||
1404 | DeducedType = S.Context.getQualifiedType(DeducedType.getUnqualifiedType(), | |||
1405 | DeducedQs); | |||
1406 | ||||
1407 | if (RecanonicalizeArg) | |||
1408 | DeducedType = S.Context.getCanonicalType(DeducedType); | |||
1409 | ||||
1410 | DeducedTemplateArgument NewDeduced(DeducedType, DeducedFromArrayBound); | |||
1411 | DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, | |||
1412 | Deduced[Index], | |||
1413 | NewDeduced); | |||
1414 | if (Result.isNull()) { | |||
1415 | Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); | |||
1416 | Info.FirstArg = Deduced[Index]; | |||
1417 | Info.SecondArg = NewDeduced; | |||
1418 | return Sema::TDK_Inconsistent; | |||
1419 | } | |||
1420 | ||||
1421 | Deduced[Index] = Result; | |||
1422 | return Sema::TDK_Success; | |||
1423 | } | |||
1424 | ||||
1425 | // Set up the template argument deduction information for a failure. | |||
1426 | Info.FirstArg = TemplateArgument(ParamIn); | |||
1427 | Info.SecondArg = TemplateArgument(ArgIn); | |||
1428 | ||||
1429 | // If the parameter is an already-substituted template parameter | |||
1430 | // pack, do nothing: we don't know which of its arguments to look | |||
1431 | // at, so we have to wait until all of the parameter packs in this | |||
1432 | // expansion have arguments. | |||
1433 | if (isa<SubstTemplateTypeParmPackType>(Param)) | |||
1434 | return Sema::TDK_Success; | |||
1435 | ||||
1436 | // Check the cv-qualifiers on the parameter and argument types. | |||
1437 | CanQualType CanParam = S.Context.getCanonicalType(Param); | |||
1438 | CanQualType CanArg = S.Context.getCanonicalType(Arg); | |||
1439 | if (!(TDF & TDF_IgnoreQualifiers)) { | |||
1440 | if (TDF & TDF_ParamWithReferenceType) { | |||
1441 | if (hasInconsistentOrSupersetQualifiersOf(Param, Arg)) | |||
1442 | return Sema::TDK_NonDeducedMismatch; | |||
1443 | } else if (TDF & TDF_ArgWithReferenceType) { | |||
1444 | // C++ [temp.deduct.conv]p4: | |||
1445 | // If the original A is a reference type, A can be more cv-qualified | |||
1446 | // than the deduced A | |||
1447 | if (!Arg.getQualifiers().compatiblyIncludes(Param.getQualifiers())) | |||
1448 | return Sema::TDK_NonDeducedMismatch; | |||
1449 | ||||
1450 | // Strip out all extra qualifiers from the argument to figure out the | |||
1451 | // type we're converting to, prior to the qualification conversion. | |||
1452 | Qualifiers Quals; | |||
1453 | Arg = S.Context.getUnqualifiedArrayType(Arg, Quals); | |||
1454 | Arg = S.Context.getQualifiedType(Arg, Param.getQualifiers()); | |||
1455 | } else if (!IsPossiblyOpaquelyQualifiedType(Param)) { | |||
1456 | if (Param.getCVRQualifiers() != Arg.getCVRQualifiers()) | |||
1457 | return Sema::TDK_NonDeducedMismatch; | |||
1458 | } | |||
1459 | ||||
1460 | // If the parameter type is not dependent, there is nothing to deduce. | |||
1461 | if (!Param->isDependentType()) { | |||
1462 | if (!(TDF & TDF_SkipNonDependent)) { | |||
1463 | bool NonDeduced = | |||
1464 | (TDF & TDF_AllowCompatibleFunctionType) | |||
1465 | ? !S.isSameOrCompatibleFunctionType(CanParam, CanArg) | |||
1466 | : Param != Arg; | |||
1467 | if (NonDeduced) { | |||
1468 | return Sema::TDK_NonDeducedMismatch; | |||
1469 | } | |||
1470 | } | |||
1471 | return Sema::TDK_Success; | |||
1472 | } | |||
1473 | } else if (!Param->isDependentType()) { | |||
1474 | CanQualType ParamUnqualType = CanParam.getUnqualifiedType(), | |||
1475 | ArgUnqualType = CanArg.getUnqualifiedType(); | |||
1476 | bool Success = | |||
1477 | (TDF & TDF_AllowCompatibleFunctionType) | |||
1478 | ? S.isSameOrCompatibleFunctionType(ParamUnqualType, ArgUnqualType) | |||
1479 | : ParamUnqualType == ArgUnqualType; | |||
1480 | if (Success) | |||
1481 | return Sema::TDK_Success; | |||
1482 | } | |||
1483 | ||||
1484 | switch (Param->getTypeClass()) { | |||
1485 | // Non-canonical types cannot appear here. | |||
1486 | #define NON_CANONICAL_TYPE(Class, Base) \ | |||
1487 | case Type::Class: llvm_unreachable("deducing non-canonical type: " #Class)::llvm::llvm_unreachable_internal("deducing non-canonical type: " #Class, "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1487); | |||
1488 | #define TYPE(Class, Base) | |||
1489 | #include "clang/AST/TypeNodes.def" | |||
1490 | ||||
1491 | case Type::TemplateTypeParm: | |||
1492 | case Type::SubstTemplateTypeParmPack: | |||
1493 | llvm_unreachable("Type nodes handled above")::llvm::llvm_unreachable_internal("Type nodes handled above", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1493); | |||
1494 | ||||
1495 | // These types cannot be dependent, so simply check whether the types are | |||
1496 | // the same. | |||
1497 | case Type::Builtin: | |||
1498 | case Type::VariableArray: | |||
1499 | case Type::Vector: | |||
1500 | case Type::FunctionNoProto: | |||
1501 | case Type::Record: | |||
1502 | case Type::Enum: | |||
1503 | case Type::ObjCObject: | |||
1504 | case Type::ObjCInterface: | |||
1505 | case Type::ObjCObjectPointer: | |||
1506 | if (TDF & TDF_SkipNonDependent) | |||
1507 | return Sema::TDK_Success; | |||
1508 | ||||
1509 | if (TDF & TDF_IgnoreQualifiers) { | |||
1510 | Param = Param.getUnqualifiedType(); | |||
1511 | Arg = Arg.getUnqualifiedType(); | |||
1512 | } | |||
1513 | ||||
1514 | return Param == Arg? Sema::TDK_Success : Sema::TDK_NonDeducedMismatch; | |||
1515 | ||||
1516 | // _Complex T [placeholder extension] | |||
1517 | case Type::Complex: | |||
1518 | if (const ComplexType *ComplexArg = Arg->getAs<ComplexType>()) | |||
1519 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1520 | cast<ComplexType>(Param)->getElementType(), | |||
1521 | ComplexArg->getElementType(), | |||
1522 | Info, Deduced, TDF); | |||
1523 | ||||
1524 | return Sema::TDK_NonDeducedMismatch; | |||
1525 | ||||
1526 | // _Atomic T [extension] | |||
1527 | case Type::Atomic: | |||
1528 | if (const AtomicType *AtomicArg = Arg->getAs<AtomicType>()) | |||
1529 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1530 | cast<AtomicType>(Param)->getValueType(), | |||
1531 | AtomicArg->getValueType(), | |||
1532 | Info, Deduced, TDF); | |||
1533 | ||||
1534 | return Sema::TDK_NonDeducedMismatch; | |||
1535 | ||||
1536 | // T * | |||
1537 | case Type::Pointer: { | |||
1538 | QualType PointeeType; | |||
1539 | if (const PointerType *PointerArg = Arg->getAs<PointerType>()) { | |||
1540 | PointeeType = PointerArg->getPointeeType(); | |||
1541 | } else if (const ObjCObjectPointerType *PointerArg | |||
1542 | = Arg->getAs<ObjCObjectPointerType>()) { | |||
1543 | PointeeType = PointerArg->getPointeeType(); | |||
1544 | } else { | |||
1545 | return Sema::TDK_NonDeducedMismatch; | |||
1546 | } | |||
1547 | ||||
1548 | unsigned SubTDF = TDF & (TDF_IgnoreQualifiers | TDF_DerivedClass); | |||
1549 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1550 | cast<PointerType>(Param)->getPointeeType(), | |||
1551 | PointeeType, | |||
1552 | Info, Deduced, SubTDF); | |||
1553 | } | |||
1554 | ||||
1555 | // T & | |||
1556 | case Type::LValueReference: { | |||
1557 | const LValueReferenceType *ReferenceArg = | |||
1558 | Arg->getAs<LValueReferenceType>(); | |||
1559 | if (!ReferenceArg) | |||
1560 | return Sema::TDK_NonDeducedMismatch; | |||
1561 | ||||
1562 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1563 | cast<LValueReferenceType>(Param)->getPointeeType(), | |||
1564 | ReferenceArg->getPointeeType(), Info, Deduced, 0); | |||
1565 | } | |||
1566 | ||||
1567 | // T && [C++0x] | |||
1568 | case Type::RValueReference: { | |||
1569 | const RValueReferenceType *ReferenceArg = | |||
1570 | Arg->getAs<RValueReferenceType>(); | |||
1571 | if (!ReferenceArg) | |||
1572 | return Sema::TDK_NonDeducedMismatch; | |||
1573 | ||||
1574 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1575 | cast<RValueReferenceType>(Param)->getPointeeType(), | |||
1576 | ReferenceArg->getPointeeType(), | |||
1577 | Info, Deduced, 0); | |||
1578 | } | |||
1579 | ||||
1580 | // T [] (implied, but not stated explicitly) | |||
1581 | case Type::IncompleteArray: { | |||
1582 | const IncompleteArrayType *IncompleteArrayArg = | |||
1583 | S.Context.getAsIncompleteArrayType(Arg); | |||
1584 | if (!IncompleteArrayArg) | |||
1585 | return Sema::TDK_NonDeducedMismatch; | |||
1586 | ||||
1587 | unsigned SubTDF = TDF & TDF_IgnoreQualifiers; | |||
1588 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1589 | S.Context.getAsIncompleteArrayType(Param)->getElementType(), | |||
1590 | IncompleteArrayArg->getElementType(), | |||
1591 | Info, Deduced, SubTDF); | |||
1592 | } | |||
1593 | ||||
1594 | // T [integer-constant] | |||
1595 | case Type::ConstantArray: { | |||
1596 | const ConstantArrayType *ConstantArrayArg = | |||
1597 | S.Context.getAsConstantArrayType(Arg); | |||
1598 | if (!ConstantArrayArg) | |||
1599 | return Sema::TDK_NonDeducedMismatch; | |||
1600 | ||||
1601 | const ConstantArrayType *ConstantArrayParm = | |||
1602 | S.Context.getAsConstantArrayType(Param); | |||
1603 | if (ConstantArrayArg->getSize() != ConstantArrayParm->getSize()) | |||
1604 | return Sema::TDK_NonDeducedMismatch; | |||
1605 | ||||
1606 | unsigned SubTDF = TDF & TDF_IgnoreQualifiers; | |||
1607 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1608 | ConstantArrayParm->getElementType(), | |||
1609 | ConstantArrayArg->getElementType(), | |||
1610 | Info, Deduced, SubTDF); | |||
1611 | } | |||
1612 | ||||
1613 | // type [i] | |||
1614 | case Type::DependentSizedArray: { | |||
1615 | const ArrayType *ArrayArg = S.Context.getAsArrayType(Arg); | |||
1616 | if (!ArrayArg) | |||
1617 | return Sema::TDK_NonDeducedMismatch; | |||
1618 | ||||
1619 | unsigned SubTDF = TDF & TDF_IgnoreQualifiers; | |||
1620 | ||||
1621 | // Check the element type of the arrays | |||
1622 | const DependentSizedArrayType *DependentArrayParm | |||
1623 | = S.Context.getAsDependentSizedArrayType(Param); | |||
1624 | if (Sema::TemplateDeductionResult Result | |||
1625 | = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1626 | DependentArrayParm->getElementType(), | |||
1627 | ArrayArg->getElementType(), | |||
1628 | Info, Deduced, SubTDF)) | |||
1629 | return Result; | |||
1630 | ||||
1631 | // Determine the array bound is something we can deduce. | |||
1632 | NonTypeTemplateParmDecl *NTTP | |||
1633 | = getDeducedParameterFromExpr(Info, DependentArrayParm->getSizeExpr()); | |||
1634 | if (!NTTP) | |||
1635 | return Sema::TDK_Success; | |||
1636 | ||||
1637 | // We can perform template argument deduction for the given non-type | |||
1638 | // template parameter. | |||
1639 | assert(NTTP->getDepth() == Info.getDeducedDepth() &&((NTTP->getDepth() == Info.getDeducedDepth() && "saw non-type template parameter with wrong depth" ) ? static_cast<void> (0) : __assert_fail ("NTTP->getDepth() == Info.getDeducedDepth() && \"saw non-type template parameter with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1640, __PRETTY_FUNCTION__)) | |||
1640 | "saw non-type template parameter with wrong depth")((NTTP->getDepth() == Info.getDeducedDepth() && "saw non-type template parameter with wrong depth" ) ? static_cast<void> (0) : __assert_fail ("NTTP->getDepth() == Info.getDeducedDepth() && \"saw non-type template parameter with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1640, __PRETTY_FUNCTION__)); | |||
1641 | if (const ConstantArrayType *ConstantArrayArg | |||
1642 | = dyn_cast<ConstantArrayType>(ArrayArg)) { | |||
1643 | llvm::APSInt Size(ConstantArrayArg->getSize()); | |||
1644 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, Size, | |||
1645 | S.Context.getSizeType(), | |||
1646 | /*ArrayBound=*/true, | |||
1647 | Info, Deduced); | |||
1648 | } | |||
1649 | if (const DependentSizedArrayType *DependentArrayArg | |||
1650 | = dyn_cast<DependentSizedArrayType>(ArrayArg)) | |||
1651 | if (DependentArrayArg->getSizeExpr()) | |||
1652 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
1653 | DependentArrayArg->getSizeExpr(), | |||
1654 | Info, Deduced); | |||
1655 | ||||
1656 | // Incomplete type does not match a dependently-sized array type | |||
1657 | return Sema::TDK_NonDeducedMismatch; | |||
1658 | } | |||
1659 | ||||
1660 | // type(*)(T) | |||
1661 | // T(*)() | |||
1662 | // T(*)(T) | |||
1663 | case Type::FunctionProto: { | |||
1664 | unsigned SubTDF = TDF & TDF_TopLevelParameterTypeList; | |||
1665 | const FunctionProtoType *FunctionProtoArg = | |||
1666 | dyn_cast<FunctionProtoType>(Arg); | |||
1667 | if (!FunctionProtoArg) | |||
1668 | return Sema::TDK_NonDeducedMismatch; | |||
1669 | ||||
1670 | const FunctionProtoType *FunctionProtoParam = | |||
1671 | cast<FunctionProtoType>(Param); | |||
1672 | ||||
1673 | if (FunctionProtoParam->getMethodQuals() | |||
1674 | != FunctionProtoArg->getMethodQuals() || | |||
1675 | FunctionProtoParam->getRefQualifier() | |||
1676 | != FunctionProtoArg->getRefQualifier() || | |||
1677 | FunctionProtoParam->isVariadic() != FunctionProtoArg->isVariadic()) | |||
1678 | return Sema::TDK_NonDeducedMismatch; | |||
1679 | ||||
1680 | // Check return types. | |||
1681 | if (auto Result = DeduceTemplateArgumentsByTypeMatch( | |||
1682 | S, TemplateParams, FunctionProtoParam->getReturnType(), | |||
1683 | FunctionProtoArg->getReturnType(), Info, Deduced, 0)) | |||
1684 | return Result; | |||
1685 | ||||
1686 | // Check parameter types. | |||
1687 | if (auto Result = DeduceTemplateArguments( | |||
1688 | S, TemplateParams, FunctionProtoParam->param_type_begin(), | |||
1689 | FunctionProtoParam->getNumParams(), | |||
1690 | FunctionProtoArg->param_type_begin(), | |||
1691 | FunctionProtoArg->getNumParams(), Info, Deduced, SubTDF)) | |||
1692 | return Result; | |||
1693 | ||||
1694 | if (TDF & TDF_AllowCompatibleFunctionType) | |||
1695 | return Sema::TDK_Success; | |||
1696 | ||||
1697 | // FIXME: Per core-2016/10/1019 (no corresponding core issue yet), permit | |||
1698 | // deducing through the noexcept-specifier if it's part of the canonical | |||
1699 | // type. libstdc++ relies on this. | |||
1700 | Expr *NoexceptExpr = FunctionProtoParam->getNoexceptExpr(); | |||
1701 | if (NonTypeTemplateParmDecl *NTTP = | |||
1702 | NoexceptExpr ? getDeducedParameterFromExpr(Info, NoexceptExpr) | |||
1703 | : nullptr) { | |||
1704 | assert(NTTP->getDepth() == Info.getDeducedDepth() &&((NTTP->getDepth() == Info.getDeducedDepth() && "saw non-type template parameter with wrong depth" ) ? static_cast<void> (0) : __assert_fail ("NTTP->getDepth() == Info.getDeducedDepth() && \"saw non-type template parameter with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1705, __PRETTY_FUNCTION__)) | |||
1705 | "saw non-type template parameter with wrong depth")((NTTP->getDepth() == Info.getDeducedDepth() && "saw non-type template parameter with wrong depth" ) ? static_cast<void> (0) : __assert_fail ("NTTP->getDepth() == Info.getDeducedDepth() && \"saw non-type template parameter with wrong depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1705, __PRETTY_FUNCTION__)); | |||
1706 | ||||
1707 | llvm::APSInt Noexcept(1); | |||
1708 | switch (FunctionProtoArg->canThrow()) { | |||
1709 | case CT_Cannot: | |||
1710 | Noexcept = 1; | |||
1711 | LLVM_FALLTHROUGH[[clang::fallthrough]]; | |||
1712 | ||||
1713 | case CT_Can: | |||
1714 | // We give E in noexcept(E) the "deduced from array bound" treatment. | |||
1715 | // FIXME: Should we? | |||
1716 | return DeduceNonTypeTemplateArgument( | |||
1717 | S, TemplateParams, NTTP, Noexcept, S.Context.BoolTy, | |||
1718 | /*ArrayBound*/true, Info, Deduced); | |||
1719 | ||||
1720 | case CT_Dependent: | |||
1721 | if (Expr *ArgNoexceptExpr = FunctionProtoArg->getNoexceptExpr()) | |||
1722 | return DeduceNonTypeTemplateArgument( | |||
1723 | S, TemplateParams, NTTP, ArgNoexceptExpr, Info, Deduced); | |||
1724 | // Can't deduce anything from throw(T...). | |||
1725 | break; | |||
1726 | } | |||
1727 | } | |||
1728 | // FIXME: Detect non-deduced exception specification mismatches? | |||
1729 | // | |||
1730 | // Careful about [temp.deduct.call] and [temp.deduct.conv], which allow | |||
1731 | // top-level differences in noexcept-specifications. | |||
1732 | ||||
1733 | return Sema::TDK_Success; | |||
1734 | } | |||
1735 | ||||
1736 | case Type::InjectedClassName: | |||
1737 | // Treat a template's injected-class-name as if the template | |||
1738 | // specialization type had been used. | |||
1739 | Param = cast<InjectedClassNameType>(Param) | |||
1740 | ->getInjectedSpecializationType(); | |||
1741 | assert(isa<TemplateSpecializationType>(Param) &&((isa<TemplateSpecializationType>(Param) && "injected class name is not a template specialization type" ) ? static_cast<void> (0) : __assert_fail ("isa<TemplateSpecializationType>(Param) && \"injected class name is not a template specialization type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1742, __PRETTY_FUNCTION__)) | |||
1742 | "injected class name is not a template specialization type")((isa<TemplateSpecializationType>(Param) && "injected class name is not a template specialization type" ) ? static_cast<void> (0) : __assert_fail ("isa<TemplateSpecializationType>(Param) && \"injected class name is not a template specialization type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1742, __PRETTY_FUNCTION__)); | |||
1743 | LLVM_FALLTHROUGH[[clang::fallthrough]]; | |||
1744 | ||||
1745 | // template-name<T> (where template-name refers to a class template) | |||
1746 | // template-name<i> | |||
1747 | // TT<T> | |||
1748 | // TT<i> | |||
1749 | // TT<> | |||
1750 | case Type::TemplateSpecialization: { | |||
1751 | const TemplateSpecializationType *SpecParam = | |||
1752 | cast<TemplateSpecializationType>(Param); | |||
1753 | ||||
1754 | // When Arg cannot be a derived class, we can just try to deduce template | |||
1755 | // arguments from the template-id. | |||
1756 | const RecordType *RecordT = Arg->getAs<RecordType>(); | |||
1757 | if (!(TDF & TDF_DerivedClass) || !RecordT) | |||
1758 | return DeduceTemplateArguments(S, TemplateParams, SpecParam, Arg, Info, | |||
1759 | Deduced); | |||
1760 | ||||
1761 | SmallVector<DeducedTemplateArgument, 8> DeducedOrig(Deduced.begin(), | |||
1762 | Deduced.end()); | |||
1763 | ||||
1764 | Sema::TemplateDeductionResult Result = DeduceTemplateArguments( | |||
1765 | S, TemplateParams, SpecParam, Arg, Info, Deduced); | |||
1766 | ||||
1767 | if (Result == Sema::TDK_Success) | |||
1768 | return Result; | |||
1769 | ||||
1770 | // We cannot inspect base classes as part of deduction when the type | |||
1771 | // is incomplete, so either instantiate any templates necessary to | |||
1772 | // complete the type, or skip over it if it cannot be completed. | |||
1773 | if (!S.isCompleteType(Info.getLocation(), Arg)) | |||
1774 | return Result; | |||
1775 | ||||
1776 | // C++14 [temp.deduct.call] p4b3: | |||
1777 | // If P is a class and P has the form simple-template-id, then the | |||
1778 | // transformed A can be a derived class of the deduced A. Likewise if | |||
1779 | // P is a pointer to a class of the form simple-template-id, the | |||
1780 | // transformed A can be a pointer to a derived class pointed to by the | |||
1781 | // deduced A. | |||
1782 | // | |||
1783 | // These alternatives are considered only if type deduction would | |||
1784 | // otherwise fail. If they yield more than one possible deduced A, the | |||
1785 | // type deduction fails. | |||
1786 | ||||
1787 | // Reset the incorrectly deduced argument from above. | |||
1788 | Deduced = DeducedOrig; | |||
1789 | ||||
1790 | // Use data recursion to crawl through the list of base classes. | |||
1791 | // Visited contains the set of nodes we have already visited, while | |||
1792 | // ToVisit is our stack of records that we still need to visit. | |||
1793 | llvm::SmallPtrSet<const RecordType *, 8> Visited; | |||
1794 | SmallVector<const RecordType *, 8> ToVisit; | |||
1795 | ToVisit.push_back(RecordT); | |||
1796 | bool Successful = false; | |||
1797 | SmallVector<DeducedTemplateArgument, 8> SuccessfulDeduced; | |||
1798 | while (!ToVisit.empty()) { | |||
1799 | // Retrieve the next class in the inheritance hierarchy. | |||
1800 | const RecordType *NextT = ToVisit.pop_back_val(); | |||
1801 | ||||
1802 | // If we have already seen this type, skip it. | |||
1803 | if (!Visited.insert(NextT).second) | |||
1804 | continue; | |||
1805 | ||||
1806 | // If this is a base class, try to perform template argument | |||
1807 | // deduction from it. | |||
1808 | if (NextT != RecordT) { | |||
1809 | TemplateDeductionInfo BaseInfo(Info.getLocation()); | |||
1810 | Sema::TemplateDeductionResult BaseResult = | |||
1811 | DeduceTemplateArguments(S, TemplateParams, SpecParam, | |||
1812 | QualType(NextT, 0), BaseInfo, Deduced); | |||
1813 | ||||
1814 | // If template argument deduction for this base was successful, | |||
1815 | // note that we had some success. Otherwise, ignore any deductions | |||
1816 | // from this base class. | |||
1817 | if (BaseResult == Sema::TDK_Success) { | |||
1818 | // If we've already seen some success, then deduction fails due to | |||
1819 | // an ambiguity (temp.deduct.call p5). | |||
1820 | if (Successful) | |||
1821 | return Sema::TDK_MiscellaneousDeductionFailure; | |||
1822 | ||||
1823 | Successful = true; | |||
1824 | std::swap(SuccessfulDeduced, Deduced); | |||
1825 | ||||
1826 | Info.Param = BaseInfo.Param; | |||
1827 | Info.FirstArg = BaseInfo.FirstArg; | |||
1828 | Info.SecondArg = BaseInfo.SecondArg; | |||
1829 | } | |||
1830 | ||||
1831 | Deduced = DeducedOrig; | |||
1832 | } | |||
1833 | ||||
1834 | // Visit base classes | |||
1835 | CXXRecordDecl *Next = cast<CXXRecordDecl>(NextT->getDecl()); | |||
1836 | for (const auto &Base : Next->bases()) { | |||
1837 | assert(Base.getType()->isRecordType() &&((Base.getType()->isRecordType() && "Base class that isn't a record?" ) ? static_cast<void> (0) : __assert_fail ("Base.getType()->isRecordType() && \"Base class that isn't a record?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1838, __PRETTY_FUNCTION__)) | |||
1838 | "Base class that isn't a record?")((Base.getType()->isRecordType() && "Base class that isn't a record?" ) ? static_cast<void> (0) : __assert_fail ("Base.getType()->isRecordType() && \"Base class that isn't a record?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 1838, __PRETTY_FUNCTION__)); | |||
1839 | ToVisit.push_back(Base.getType()->getAs<RecordType>()); | |||
1840 | } | |||
1841 | } | |||
1842 | ||||
1843 | if (Successful) { | |||
1844 | std::swap(SuccessfulDeduced, Deduced); | |||
1845 | return Sema::TDK_Success; | |||
1846 | } | |||
1847 | ||||
1848 | return Result; | |||
1849 | } | |||
1850 | ||||
1851 | // T type::* | |||
1852 | // T T::* | |||
1853 | // T (type::*)() | |||
1854 | // type (T::*)() | |||
1855 | // type (type::*)(T) | |||
1856 | // type (T::*)(T) | |||
1857 | // T (type::*)(T) | |||
1858 | // T (T::*)() | |||
1859 | // T (T::*)(T) | |||
1860 | case Type::MemberPointer: { | |||
1861 | const MemberPointerType *MemPtrParam = cast<MemberPointerType>(Param); | |||
1862 | const MemberPointerType *MemPtrArg = dyn_cast<MemberPointerType>(Arg); | |||
1863 | if (!MemPtrArg) | |||
1864 | return Sema::TDK_NonDeducedMismatch; | |||
1865 | ||||
1866 | QualType ParamPointeeType = MemPtrParam->getPointeeType(); | |||
1867 | if (ParamPointeeType->isFunctionType()) | |||
1868 | S.adjustMemberFunctionCC(ParamPointeeType, /*IsStatic=*/true, | |||
1869 | /*IsCtorOrDtor=*/false, Info.getLocation()); | |||
1870 | QualType ArgPointeeType = MemPtrArg->getPointeeType(); | |||
1871 | if (ArgPointeeType->isFunctionType()) | |||
1872 | S.adjustMemberFunctionCC(ArgPointeeType, /*IsStatic=*/true, | |||
1873 | /*IsCtorOrDtor=*/false, Info.getLocation()); | |||
1874 | ||||
1875 | if (Sema::TemplateDeductionResult Result | |||
1876 | = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1877 | ParamPointeeType, | |||
1878 | ArgPointeeType, | |||
1879 | Info, Deduced, | |||
1880 | TDF & TDF_IgnoreQualifiers)) | |||
1881 | return Result; | |||
1882 | ||||
1883 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1884 | QualType(MemPtrParam->getClass(), 0), | |||
1885 | QualType(MemPtrArg->getClass(), 0), | |||
1886 | Info, Deduced, | |||
1887 | TDF & TDF_IgnoreQualifiers); | |||
1888 | } | |||
1889 | ||||
1890 | // (clang extension) | |||
1891 | // | |||
1892 | // type(^)(T) | |||
1893 | // T(^)() | |||
1894 | // T(^)(T) | |||
1895 | case Type::BlockPointer: { | |||
1896 | const BlockPointerType *BlockPtrParam = cast<BlockPointerType>(Param); | |||
1897 | const BlockPointerType *BlockPtrArg = dyn_cast<BlockPointerType>(Arg); | |||
1898 | ||||
1899 | if (!BlockPtrArg) | |||
1900 | return Sema::TDK_NonDeducedMismatch; | |||
1901 | ||||
1902 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1903 | BlockPtrParam->getPointeeType(), | |||
1904 | BlockPtrArg->getPointeeType(), | |||
1905 | Info, Deduced, 0); | |||
1906 | } | |||
1907 | ||||
1908 | // (clang extension) | |||
1909 | // | |||
1910 | // T __attribute__(((ext_vector_type(<integral constant>)))) | |||
1911 | case Type::ExtVector: { | |||
1912 | const ExtVectorType *VectorParam = cast<ExtVectorType>(Param); | |||
1913 | if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { | |||
1914 | // Make sure that the vectors have the same number of elements. | |||
1915 | if (VectorParam->getNumElements() != VectorArg->getNumElements()) | |||
1916 | return Sema::TDK_NonDeducedMismatch; | |||
1917 | ||||
1918 | // Perform deduction on the element types. | |||
1919 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1920 | VectorParam->getElementType(), | |||
1921 | VectorArg->getElementType(), | |||
1922 | Info, Deduced, TDF); | |||
1923 | } | |||
1924 | ||||
1925 | if (const DependentSizedExtVectorType *VectorArg | |||
1926 | = dyn_cast<DependentSizedExtVectorType>(Arg)) { | |||
1927 | // We can't check the number of elements, since the argument has a | |||
1928 | // dependent number of elements. This can only occur during partial | |||
1929 | // ordering. | |||
1930 | ||||
1931 | // Perform deduction on the element types. | |||
1932 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
1933 | VectorParam->getElementType(), | |||
1934 | VectorArg->getElementType(), | |||
1935 | Info, Deduced, TDF); | |||
1936 | } | |||
1937 | ||||
1938 | return Sema::TDK_NonDeducedMismatch; | |||
1939 | } | |||
1940 | ||||
1941 | case Type::DependentVector: { | |||
1942 | const auto *VectorParam = cast<DependentVectorType>(Param); | |||
1943 | ||||
1944 | if (const auto *VectorArg = dyn_cast<VectorType>(Arg)) { | |||
1945 | // Perform deduction on the element types. | |||
1946 | if (Sema::TemplateDeductionResult Result = | |||
1947 | DeduceTemplateArgumentsByTypeMatch( | |||
1948 | S, TemplateParams, VectorParam->getElementType(), | |||
1949 | VectorArg->getElementType(), Info, Deduced, TDF)) | |||
1950 | return Result; | |||
1951 | ||||
1952 | // Perform deduction on the vector size, if we can. | |||
1953 | NonTypeTemplateParmDecl *NTTP = | |||
1954 | getDeducedParameterFromExpr(Info, VectorParam->getSizeExpr()); | |||
1955 | if (!NTTP) | |||
1956 | return Sema::TDK_Success; | |||
1957 | ||||
1958 | llvm::APSInt ArgSize(S.Context.getTypeSize(S.Context.IntTy), false); | |||
1959 | ArgSize = VectorArg->getNumElements(); | |||
1960 | // Note that we use the "array bound" rules here; just like in that | |||
1961 | // case, we don't have any particular type for the vector size, but | |||
1962 | // we can provide one if necessary. | |||
1963 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, ArgSize, | |||
1964 | S.Context.UnsignedIntTy, true, | |||
1965 | Info, Deduced); | |||
1966 | } | |||
1967 | ||||
1968 | if (const auto *VectorArg = dyn_cast<DependentVectorType>(Arg)) { | |||
1969 | // Perform deduction on the element types. | |||
1970 | if (Sema::TemplateDeductionResult Result = | |||
1971 | DeduceTemplateArgumentsByTypeMatch( | |||
1972 | S, TemplateParams, VectorParam->getElementType(), | |||
1973 | VectorArg->getElementType(), Info, Deduced, TDF)) | |||
1974 | return Result; | |||
1975 | ||||
1976 | // Perform deduction on the vector size, if we can. | |||
1977 | NonTypeTemplateParmDecl *NTTP = getDeducedParameterFromExpr( | |||
1978 | Info, VectorParam->getSizeExpr()); | |||
1979 | if (!NTTP) | |||
1980 | return Sema::TDK_Success; | |||
1981 | ||||
1982 | return DeduceNonTypeTemplateArgument( | |||
1983 | S, TemplateParams, NTTP, VectorArg->getSizeExpr(), Info, Deduced); | |||
1984 | } | |||
1985 | ||||
1986 | return Sema::TDK_NonDeducedMismatch; | |||
1987 | } | |||
1988 | ||||
1989 | // (clang extension) | |||
1990 | // | |||
1991 | // T __attribute__(((ext_vector_type(N)))) | |||
1992 | case Type::DependentSizedExtVector: { | |||
1993 | const DependentSizedExtVectorType *VectorParam | |||
1994 | = cast<DependentSizedExtVectorType>(Param); | |||
1995 | ||||
1996 | if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { | |||
1997 | // Perform deduction on the element types. | |||
1998 | if (Sema::TemplateDeductionResult Result | |||
1999 | = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
2000 | VectorParam->getElementType(), | |||
2001 | VectorArg->getElementType(), | |||
2002 | Info, Deduced, TDF)) | |||
2003 | return Result; | |||
2004 | ||||
2005 | // Perform deduction on the vector size, if we can. | |||
2006 | NonTypeTemplateParmDecl *NTTP | |||
2007 | = getDeducedParameterFromExpr(Info, VectorParam->getSizeExpr()); | |||
2008 | if (!NTTP) | |||
2009 | return Sema::TDK_Success; | |||
2010 | ||||
2011 | llvm::APSInt ArgSize(S.Context.getTypeSize(S.Context.IntTy), false); | |||
2012 | ArgSize = VectorArg->getNumElements(); | |||
2013 | // Note that we use the "array bound" rules here; just like in that | |||
2014 | // case, we don't have any particular type for the vector size, but | |||
2015 | // we can provide one if necessary. | |||
2016 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, ArgSize, | |||
2017 | S.Context.IntTy, true, Info, | |||
2018 | Deduced); | |||
2019 | } | |||
2020 | ||||
2021 | if (const DependentSizedExtVectorType *VectorArg | |||
2022 | = dyn_cast<DependentSizedExtVectorType>(Arg)) { | |||
2023 | // Perform deduction on the element types. | |||
2024 | if (Sema::TemplateDeductionResult Result | |||
2025 | = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
2026 | VectorParam->getElementType(), | |||
2027 | VectorArg->getElementType(), | |||
2028 | Info, Deduced, TDF)) | |||
2029 | return Result; | |||
2030 | ||||
2031 | // Perform deduction on the vector size, if we can. | |||
2032 | NonTypeTemplateParmDecl *NTTP | |||
2033 | = getDeducedParameterFromExpr(Info, VectorParam->getSizeExpr()); | |||
2034 | if (!NTTP) | |||
2035 | return Sema::TDK_Success; | |||
2036 | ||||
2037 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
2038 | VectorArg->getSizeExpr(), | |||
2039 | Info, Deduced); | |||
2040 | } | |||
2041 | ||||
2042 | return Sema::TDK_NonDeducedMismatch; | |||
2043 | } | |||
2044 | ||||
2045 | // (clang extension) | |||
2046 | // | |||
2047 | // T __attribute__(((address_space(N)))) | |||
2048 | case Type::DependentAddressSpace: { | |||
2049 | const DependentAddressSpaceType *AddressSpaceParam = | |||
2050 | cast<DependentAddressSpaceType>(Param); | |||
2051 | ||||
2052 | if (const DependentAddressSpaceType *AddressSpaceArg = | |||
2053 | dyn_cast<DependentAddressSpaceType>(Arg)) { | |||
2054 | // Perform deduction on the pointer type. | |||
2055 | if (Sema::TemplateDeductionResult Result = | |||
2056 | DeduceTemplateArgumentsByTypeMatch( | |||
2057 | S, TemplateParams, AddressSpaceParam->getPointeeType(), | |||
2058 | AddressSpaceArg->getPointeeType(), Info, Deduced, TDF)) | |||
2059 | return Result; | |||
2060 | ||||
2061 | // Perform deduction on the address space, if we can. | |||
2062 | NonTypeTemplateParmDecl *NTTP = getDeducedParameterFromExpr( | |||
2063 | Info, AddressSpaceParam->getAddrSpaceExpr()); | |||
2064 | if (!NTTP) | |||
2065 | return Sema::TDK_Success; | |||
2066 | ||||
2067 | return DeduceNonTypeTemplateArgument( | |||
2068 | S, TemplateParams, NTTP, AddressSpaceArg->getAddrSpaceExpr(), Info, | |||
2069 | Deduced); | |||
2070 | } | |||
2071 | ||||
2072 | if (isTargetAddressSpace(Arg.getAddressSpace())) { | |||
2073 | llvm::APSInt ArgAddressSpace(S.Context.getTypeSize(S.Context.IntTy), | |||
2074 | false); | |||
2075 | ArgAddressSpace = toTargetAddressSpace(Arg.getAddressSpace()); | |||
2076 | ||||
2077 | // Perform deduction on the pointer types. | |||
2078 | if (Sema::TemplateDeductionResult Result = | |||
2079 | DeduceTemplateArgumentsByTypeMatch( | |||
2080 | S, TemplateParams, AddressSpaceParam->getPointeeType(), | |||
2081 | S.Context.removeAddrSpaceQualType(Arg), Info, Deduced, TDF)) | |||
2082 | return Result; | |||
2083 | ||||
2084 | // Perform deduction on the address space, if we can. | |||
2085 | NonTypeTemplateParmDecl *NTTP = getDeducedParameterFromExpr( | |||
2086 | Info, AddressSpaceParam->getAddrSpaceExpr()); | |||
2087 | if (!NTTP) | |||
2088 | return Sema::TDK_Success; | |||
2089 | ||||
2090 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
2091 | ArgAddressSpace, S.Context.IntTy, | |||
2092 | true, Info, Deduced); | |||
2093 | } | |||
2094 | ||||
2095 | return Sema::TDK_NonDeducedMismatch; | |||
2096 | } | |||
2097 | ||||
2098 | case Type::TypeOfExpr: | |||
2099 | case Type::TypeOf: | |||
2100 | case Type::DependentName: | |||
2101 | case Type::UnresolvedUsing: | |||
2102 | case Type::Decltype: | |||
2103 | case Type::UnaryTransform: | |||
2104 | case Type::Auto: | |||
2105 | case Type::DeducedTemplateSpecialization: | |||
2106 | case Type::DependentTemplateSpecialization: | |||
2107 | case Type::PackExpansion: | |||
2108 | case Type::Pipe: | |||
2109 | // No template argument deduction for these types | |||
2110 | return Sema::TDK_Success; | |||
2111 | } | |||
2112 | ||||
2113 | llvm_unreachable("Invalid Type Class!")::llvm::llvm_unreachable_internal("Invalid Type Class!", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2113); | |||
2114 | } | |||
2115 | ||||
2116 | static Sema::TemplateDeductionResult | |||
2117 | DeduceTemplateArguments(Sema &S, | |||
2118 | TemplateParameterList *TemplateParams, | |||
2119 | const TemplateArgument &Param, | |||
2120 | TemplateArgument Arg, | |||
2121 | TemplateDeductionInfo &Info, | |||
2122 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
2123 | // If the template argument is a pack expansion, perform template argument | |||
2124 | // deduction against the pattern of that expansion. This only occurs during | |||
2125 | // partial ordering. | |||
2126 | if (Arg.isPackExpansion()) | |||
2127 | Arg = Arg.getPackExpansionPattern(); | |||
2128 | ||||
2129 | switch (Param.getKind()) { | |||
2130 | case TemplateArgument::Null: | |||
2131 | llvm_unreachable("Null template argument in parameter list")::llvm::llvm_unreachable_internal("Null template argument in parameter list" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2131); | |||
2132 | ||||
2133 | case TemplateArgument::Type: | |||
2134 | if (Arg.getKind() == TemplateArgument::Type) | |||
2135 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
2136 | Param.getAsType(), | |||
2137 | Arg.getAsType(), | |||
2138 | Info, Deduced, 0); | |||
2139 | Info.FirstArg = Param; | |||
2140 | Info.SecondArg = Arg; | |||
2141 | return Sema::TDK_NonDeducedMismatch; | |||
2142 | ||||
2143 | case TemplateArgument::Template: | |||
2144 | if (Arg.getKind() == TemplateArgument::Template) | |||
2145 | return DeduceTemplateArguments(S, TemplateParams, | |||
2146 | Param.getAsTemplate(), | |||
2147 | Arg.getAsTemplate(), Info, Deduced); | |||
2148 | Info.FirstArg = Param; | |||
2149 | Info.SecondArg = Arg; | |||
2150 | return Sema::TDK_NonDeducedMismatch; | |||
2151 | ||||
2152 | case TemplateArgument::TemplateExpansion: | |||
2153 | llvm_unreachable("caller should handle pack expansions")::llvm::llvm_unreachable_internal("caller should handle pack expansions" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2153); | |||
2154 | ||||
2155 | case TemplateArgument::Declaration: | |||
2156 | if (Arg.getKind() == TemplateArgument::Declaration && | |||
2157 | isSameDeclaration(Param.getAsDecl(), Arg.getAsDecl())) | |||
2158 | return Sema::TDK_Success; | |||
2159 | ||||
2160 | Info.FirstArg = Param; | |||
2161 | Info.SecondArg = Arg; | |||
2162 | return Sema::TDK_NonDeducedMismatch; | |||
2163 | ||||
2164 | case TemplateArgument::NullPtr: | |||
2165 | if (Arg.getKind() == TemplateArgument::NullPtr && | |||
2166 | S.Context.hasSameType(Param.getNullPtrType(), Arg.getNullPtrType())) | |||
2167 | return Sema::TDK_Success; | |||
2168 | ||||
2169 | Info.FirstArg = Param; | |||
2170 | Info.SecondArg = Arg; | |||
2171 | return Sema::TDK_NonDeducedMismatch; | |||
2172 | ||||
2173 | case TemplateArgument::Integral: | |||
2174 | if (Arg.getKind() == TemplateArgument::Integral) { | |||
2175 | if (hasSameExtendedValue(Param.getAsIntegral(), Arg.getAsIntegral())) | |||
2176 | return Sema::TDK_Success; | |||
2177 | ||||
2178 | Info.FirstArg = Param; | |||
2179 | Info.SecondArg = Arg; | |||
2180 | return Sema::TDK_NonDeducedMismatch; | |||
2181 | } | |||
2182 | ||||
2183 | if (Arg.getKind() == TemplateArgument::Expression) { | |||
2184 | Info.FirstArg = Param; | |||
2185 | Info.SecondArg = Arg; | |||
2186 | return Sema::TDK_NonDeducedMismatch; | |||
2187 | } | |||
2188 | ||||
2189 | Info.FirstArg = Param; | |||
2190 | Info.SecondArg = Arg; | |||
2191 | return Sema::TDK_NonDeducedMismatch; | |||
2192 | ||||
2193 | case TemplateArgument::Expression: | |||
2194 | if (NonTypeTemplateParmDecl *NTTP | |||
2195 | = getDeducedParameterFromExpr(Info, Param.getAsExpr())) { | |||
2196 | if (Arg.getKind() == TemplateArgument::Integral) | |||
2197 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
2198 | Arg.getAsIntegral(), | |||
2199 | Arg.getIntegralType(), | |||
2200 | /*ArrayBound=*/false, | |||
2201 | Info, Deduced); | |||
2202 | if (Arg.getKind() == TemplateArgument::NullPtr) | |||
2203 | return DeduceNullPtrTemplateArgument(S, TemplateParams, NTTP, | |||
2204 | Arg.getNullPtrType(), | |||
2205 | Info, Deduced); | |||
2206 | if (Arg.getKind() == TemplateArgument::Expression) | |||
2207 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
2208 | Arg.getAsExpr(), Info, Deduced); | |||
2209 | if (Arg.getKind() == TemplateArgument::Declaration) | |||
2210 | return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, | |||
2211 | Arg.getAsDecl(), | |||
2212 | Arg.getParamTypeForDecl(), | |||
2213 | Info, Deduced); | |||
2214 | ||||
2215 | Info.FirstArg = Param; | |||
2216 | Info.SecondArg = Arg; | |||
2217 | return Sema::TDK_NonDeducedMismatch; | |||
2218 | } | |||
2219 | ||||
2220 | // Can't deduce anything, but that's okay. | |||
2221 | return Sema::TDK_Success; | |||
2222 | ||||
2223 | case TemplateArgument::Pack: | |||
2224 | llvm_unreachable("Argument packs should be expanded by the caller!")::llvm::llvm_unreachable_internal("Argument packs should be expanded by the caller!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2224); | |||
2225 | } | |||
2226 | ||||
2227 | llvm_unreachable("Invalid TemplateArgument Kind!")::llvm::llvm_unreachable_internal("Invalid TemplateArgument Kind!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2227); | |||
2228 | } | |||
2229 | ||||
2230 | /// Determine whether there is a template argument to be used for | |||
2231 | /// deduction. | |||
2232 | /// | |||
2233 | /// This routine "expands" argument packs in-place, overriding its input | |||
2234 | /// parameters so that \c Args[ArgIdx] will be the available template argument. | |||
2235 | /// | |||
2236 | /// \returns true if there is another template argument (which will be at | |||
2237 | /// \c Args[ArgIdx]), false otherwise. | |||
2238 | static bool hasTemplateArgumentForDeduction(ArrayRef<TemplateArgument> &Args, | |||
2239 | unsigned &ArgIdx) { | |||
2240 | if (ArgIdx == Args.size()) | |||
2241 | return false; | |||
2242 | ||||
2243 | const TemplateArgument &Arg = Args[ArgIdx]; | |||
2244 | if (Arg.getKind() != TemplateArgument::Pack) | |||
2245 | return true; | |||
2246 | ||||
2247 | assert(ArgIdx == Args.size() - 1 && "Pack not at the end of argument list?")((ArgIdx == Args.size() - 1 && "Pack not at the end of argument list?" ) ? static_cast<void> (0) : __assert_fail ("ArgIdx == Args.size() - 1 && \"Pack not at the end of argument list?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2247, __PRETTY_FUNCTION__)); | |||
2248 | Args = Arg.pack_elements(); | |||
2249 | ArgIdx = 0; | |||
2250 | return ArgIdx < Args.size(); | |||
2251 | } | |||
2252 | ||||
2253 | /// Determine whether the given set of template arguments has a pack | |||
2254 | /// expansion that is not the last template argument. | |||
2255 | static bool hasPackExpansionBeforeEnd(ArrayRef<TemplateArgument> Args) { | |||
2256 | bool FoundPackExpansion = false; | |||
2257 | for (const auto &A : Args) { | |||
2258 | if (FoundPackExpansion) | |||
2259 | return true; | |||
2260 | ||||
2261 | if (A.getKind() == TemplateArgument::Pack) | |||
2262 | return hasPackExpansionBeforeEnd(A.pack_elements()); | |||
2263 | ||||
2264 | // FIXME: If this is a fixed-arity pack expansion from an outer level of | |||
2265 | // templates, it should not be treated as a pack expansion. | |||
2266 | if (A.isPackExpansion()) | |||
2267 | FoundPackExpansion = true; | |||
2268 | } | |||
2269 | ||||
2270 | return false; | |||
2271 | } | |||
2272 | ||||
2273 | static Sema::TemplateDeductionResult | |||
2274 | DeduceTemplateArguments(Sema &S, TemplateParameterList *TemplateParams, | |||
2275 | ArrayRef<TemplateArgument> Params, | |||
2276 | ArrayRef<TemplateArgument> Args, | |||
2277 | TemplateDeductionInfo &Info, | |||
2278 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
2279 | bool NumberOfArgumentsMustMatch) { | |||
2280 | // C++0x [temp.deduct.type]p9: | |||
2281 | // If the template argument list of P contains a pack expansion that is not | |||
2282 | // the last template argument, the entire template argument list is a | |||
2283 | // non-deduced context. | |||
2284 | if (hasPackExpansionBeforeEnd(Params)) | |||
2285 | return Sema::TDK_Success; | |||
2286 | ||||
2287 | // C++0x [temp.deduct.type]p9: | |||
2288 | // If P has a form that contains <T> or <i>, then each argument Pi of the | |||
2289 | // respective template argument list P is compared with the corresponding | |||
2290 | // argument Ai of the corresponding template argument list of A. | |||
2291 | unsigned ArgIdx = 0, ParamIdx = 0; | |||
2292 | for (; hasTemplateArgumentForDeduction(Params, ParamIdx); ++ParamIdx) { | |||
2293 | if (!Params[ParamIdx].isPackExpansion()) { | |||
2294 | // The simple case: deduce template arguments by matching Pi and Ai. | |||
2295 | ||||
2296 | // Check whether we have enough arguments. | |||
2297 | if (!hasTemplateArgumentForDeduction(Args, ArgIdx)) | |||
2298 | return NumberOfArgumentsMustMatch | |||
2299 | ? Sema::TDK_MiscellaneousDeductionFailure | |||
2300 | : Sema::TDK_Success; | |||
2301 | ||||
2302 | // C++1z [temp.deduct.type]p9: | |||
2303 | // During partial ordering, if Ai was originally a pack expansion [and] | |||
2304 | // Pi is not a pack expansion, template argument deduction fails. | |||
2305 | if (Args[ArgIdx].isPackExpansion()) | |||
2306 | return Sema::TDK_MiscellaneousDeductionFailure; | |||
2307 | ||||
2308 | // Perform deduction for this Pi/Ai pair. | |||
2309 | if (Sema::TemplateDeductionResult Result | |||
2310 | = DeduceTemplateArguments(S, TemplateParams, | |||
2311 | Params[ParamIdx], Args[ArgIdx], | |||
2312 | Info, Deduced)) | |||
2313 | return Result; | |||
2314 | ||||
2315 | // Move to the next argument. | |||
2316 | ++ArgIdx; | |||
2317 | continue; | |||
2318 | } | |||
2319 | ||||
2320 | // The parameter is a pack expansion. | |||
2321 | ||||
2322 | // C++0x [temp.deduct.type]p9: | |||
2323 | // If Pi is a pack expansion, then the pattern of Pi is compared with | |||
2324 | // each remaining argument in the template argument list of A. Each | |||
2325 | // comparison deduces template arguments for subsequent positions in the | |||
2326 | // template parameter packs expanded by Pi. | |||
2327 | TemplateArgument Pattern = Params[ParamIdx].getPackExpansionPattern(); | |||
2328 | ||||
2329 | // Prepare to deduce the packs within the pattern. | |||
2330 | PackDeductionScope PackScope(S, TemplateParams, Deduced, Info, Pattern); | |||
2331 | ||||
2332 | // Keep track of the deduced template arguments for each parameter pack | |||
2333 | // expanded by this pack expansion (the outer index) and for each | |||
2334 | // template argument (the inner SmallVectors). | |||
2335 | for (; hasTemplateArgumentForDeduction(Args, ArgIdx) && | |||
2336 | PackScope.hasNextElement(); | |||
2337 | ++ArgIdx) { | |||
2338 | // Deduce template arguments from the pattern. | |||
2339 | if (Sema::TemplateDeductionResult Result | |||
2340 | = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], | |||
2341 | Info, Deduced)) | |||
2342 | return Result; | |||
2343 | ||||
2344 | PackScope.nextPackElement(); | |||
2345 | } | |||
2346 | ||||
2347 | // Build argument packs for each of the parameter packs expanded by this | |||
2348 | // pack expansion. | |||
2349 | if (auto Result = PackScope.finish()) | |||
2350 | return Result; | |||
2351 | } | |||
2352 | ||||
2353 | return Sema::TDK_Success; | |||
2354 | } | |||
2355 | ||||
2356 | static Sema::TemplateDeductionResult | |||
2357 | DeduceTemplateArguments(Sema &S, | |||
2358 | TemplateParameterList *TemplateParams, | |||
2359 | const TemplateArgumentList &ParamList, | |||
2360 | const TemplateArgumentList &ArgList, | |||
2361 | TemplateDeductionInfo &Info, | |||
2362 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { | |||
2363 | return DeduceTemplateArguments(S, TemplateParams, ParamList.asArray(), | |||
2364 | ArgList.asArray(), Info, Deduced, | |||
2365 | /*NumberOfArgumentsMustMatch*/false); | |||
2366 | } | |||
2367 | ||||
2368 | /// Determine whether two template arguments are the same. | |||
2369 | static bool isSameTemplateArg(ASTContext &Context, | |||
2370 | TemplateArgument X, | |||
2371 | const TemplateArgument &Y, | |||
2372 | bool PackExpansionMatchesPack = false) { | |||
2373 | // If we're checking deduced arguments (X) against original arguments (Y), | |||
2374 | // we will have flattened packs to non-expansions in X. | |||
2375 | if (PackExpansionMatchesPack && X.isPackExpansion() && !Y.isPackExpansion()) | |||
2376 | X = X.getPackExpansionPattern(); | |||
2377 | ||||
2378 | if (X.getKind() != Y.getKind()) | |||
2379 | return false; | |||
2380 | ||||
2381 | switch (X.getKind()) { | |||
2382 | case TemplateArgument::Null: | |||
2383 | llvm_unreachable("Comparing NULL template argument")::llvm::llvm_unreachable_internal("Comparing NULL template argument" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2383); | |||
2384 | ||||
2385 | case TemplateArgument::Type: | |||
2386 | return Context.getCanonicalType(X.getAsType()) == | |||
2387 | Context.getCanonicalType(Y.getAsType()); | |||
2388 | ||||
2389 | case TemplateArgument::Declaration: | |||
2390 | return isSameDeclaration(X.getAsDecl(), Y.getAsDecl()); | |||
2391 | ||||
2392 | case TemplateArgument::NullPtr: | |||
2393 | return Context.hasSameType(X.getNullPtrType(), Y.getNullPtrType()); | |||
2394 | ||||
2395 | case TemplateArgument::Template: | |||
2396 | case TemplateArgument::TemplateExpansion: | |||
2397 | return Context.getCanonicalTemplateName( | |||
2398 | X.getAsTemplateOrTemplatePattern()).getAsVoidPointer() == | |||
2399 | Context.getCanonicalTemplateName( | |||
2400 | Y.getAsTemplateOrTemplatePattern()).getAsVoidPointer(); | |||
2401 | ||||
2402 | case TemplateArgument::Integral: | |||
2403 | return hasSameExtendedValue(X.getAsIntegral(), Y.getAsIntegral()); | |||
2404 | ||||
2405 | case TemplateArgument::Expression: { | |||
2406 | llvm::FoldingSetNodeID XID, YID; | |||
2407 | X.getAsExpr()->Profile(XID, Context, true); | |||
2408 | Y.getAsExpr()->Profile(YID, Context, true); | |||
2409 | return XID == YID; | |||
2410 | } | |||
2411 | ||||
2412 | case TemplateArgument::Pack: | |||
2413 | if (X.pack_size() != Y.pack_size()) | |||
2414 | return false; | |||
2415 | ||||
2416 | for (TemplateArgument::pack_iterator XP = X.pack_begin(), | |||
2417 | XPEnd = X.pack_end(), | |||
2418 | YP = Y.pack_begin(); | |||
2419 | XP != XPEnd; ++XP, ++YP) | |||
2420 | if (!isSameTemplateArg(Context, *XP, *YP, PackExpansionMatchesPack)) | |||
2421 | return false; | |||
2422 | ||||
2423 | return true; | |||
2424 | } | |||
2425 | ||||
2426 | llvm_unreachable("Invalid TemplateArgument Kind!")::llvm::llvm_unreachable_internal("Invalid TemplateArgument Kind!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2426); | |||
2427 | } | |||
2428 | ||||
2429 | /// Allocate a TemplateArgumentLoc where all locations have | |||
2430 | /// been initialized to the given location. | |||
2431 | /// | |||
2432 | /// \param Arg The template argument we are producing template argument | |||
2433 | /// location information for. | |||
2434 | /// | |||
2435 | /// \param NTTPType For a declaration template argument, the type of | |||
2436 | /// the non-type template parameter that corresponds to this template | |||
2437 | /// argument. Can be null if no type sugar is available to add to the | |||
2438 | /// type from the template argument. | |||
2439 | /// | |||
2440 | /// \param Loc The source location to use for the resulting template | |||
2441 | /// argument. | |||
2442 | TemplateArgumentLoc | |||
2443 | Sema::getTrivialTemplateArgumentLoc(const TemplateArgument &Arg, | |||
2444 | QualType NTTPType, SourceLocation Loc) { | |||
2445 | switch (Arg.getKind()) { | |||
2446 | case TemplateArgument::Null: | |||
2447 | llvm_unreachable("Can't get a NULL template argument here")::llvm::llvm_unreachable_internal("Can't get a NULL template argument here" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2447); | |||
2448 | ||||
2449 | case TemplateArgument::Type: | |||
2450 | return TemplateArgumentLoc( | |||
2451 | Arg, Context.getTrivialTypeSourceInfo(Arg.getAsType(), Loc)); | |||
2452 | ||||
2453 | case TemplateArgument::Declaration: { | |||
2454 | if (NTTPType.isNull()) | |||
2455 | NTTPType = Arg.getParamTypeForDecl(); | |||
2456 | Expr *E = BuildExpressionFromDeclTemplateArgument(Arg, NTTPType, Loc) | |||
2457 | .getAs<Expr>(); | |||
2458 | return TemplateArgumentLoc(TemplateArgument(E), E); | |||
2459 | } | |||
2460 | ||||
2461 | case TemplateArgument::NullPtr: { | |||
2462 | if (NTTPType.isNull()) | |||
2463 | NTTPType = Arg.getNullPtrType(); | |||
2464 | Expr *E = BuildExpressionFromDeclTemplateArgument(Arg, NTTPType, Loc) | |||
2465 | .getAs<Expr>(); | |||
2466 | return TemplateArgumentLoc(TemplateArgument(NTTPType, /*isNullPtr*/true), | |||
2467 | E); | |||
2468 | } | |||
2469 | ||||
2470 | case TemplateArgument::Integral: { | |||
2471 | Expr *E = | |||
2472 | BuildExpressionFromIntegralTemplateArgument(Arg, Loc).getAs<Expr>(); | |||
2473 | return TemplateArgumentLoc(TemplateArgument(E), E); | |||
2474 | } | |||
2475 | ||||
2476 | case TemplateArgument::Template: | |||
2477 | case TemplateArgument::TemplateExpansion: { | |||
2478 | NestedNameSpecifierLocBuilder Builder; | |||
2479 | TemplateName Template = Arg.getAsTemplate(); | |||
2480 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) | |||
2481 | Builder.MakeTrivial(Context, DTN->getQualifier(), Loc); | |||
2482 | else if (QualifiedTemplateName *QTN = | |||
2483 | Template.getAsQualifiedTemplateName()) | |||
2484 | Builder.MakeTrivial(Context, QTN->getQualifier(), Loc); | |||
2485 | ||||
2486 | if (Arg.getKind() == TemplateArgument::Template) | |||
2487 | return TemplateArgumentLoc(Arg, Builder.getWithLocInContext(Context), | |||
2488 | Loc); | |||
2489 | ||||
2490 | return TemplateArgumentLoc(Arg, Builder.getWithLocInContext(Context), | |||
2491 | Loc, Loc); | |||
2492 | } | |||
2493 | ||||
2494 | case TemplateArgument::Expression: | |||
2495 | return TemplateArgumentLoc(Arg, Arg.getAsExpr()); | |||
2496 | ||||
2497 | case TemplateArgument::Pack: | |||
2498 | return TemplateArgumentLoc(Arg, TemplateArgumentLocInfo()); | |||
2499 | } | |||
2500 | ||||
2501 | llvm_unreachable("Invalid TemplateArgument Kind!")::llvm::llvm_unreachable_internal("Invalid TemplateArgument Kind!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2501); | |||
2502 | } | |||
2503 | ||||
2504 | /// Convert the given deduced template argument and add it to the set of | |||
2505 | /// fully-converted template arguments. | |||
2506 | static bool | |||
2507 | ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param, | |||
2508 | DeducedTemplateArgument Arg, | |||
2509 | NamedDecl *Template, | |||
2510 | TemplateDeductionInfo &Info, | |||
2511 | bool IsDeduced, | |||
2512 | SmallVectorImpl<TemplateArgument> &Output) { | |||
2513 | auto ConvertArg = [&](DeducedTemplateArgument Arg, | |||
2514 | unsigned ArgumentPackIndex) { | |||
2515 | // Convert the deduced template argument into a template | |||
2516 | // argument that we can check, almost as if the user had written | |||
2517 | // the template argument explicitly. | |||
2518 | TemplateArgumentLoc ArgLoc = | |||
2519 | S.getTrivialTemplateArgumentLoc(Arg, QualType(), Info.getLocation()); | |||
2520 | ||||
2521 | // Check the template argument, converting it as necessary. | |||
2522 | return S.CheckTemplateArgument( | |||
2523 | Param, ArgLoc, Template, Template->getLocation(), | |||
2524 | Template->getSourceRange().getEnd(), ArgumentPackIndex, Output, | |||
2525 | IsDeduced | |||
2526 | ? (Arg.wasDeducedFromArrayBound() ? Sema::CTAK_DeducedFromArrayBound | |||
2527 | : Sema::CTAK_Deduced) | |||
2528 | : Sema::CTAK_Specified); | |||
2529 | }; | |||
2530 | ||||
2531 | if (Arg.getKind() == TemplateArgument::Pack) { | |||
2532 | // This is a template argument pack, so check each of its arguments against | |||
2533 | // the template parameter. | |||
2534 | SmallVector<TemplateArgument, 2> PackedArgsBuilder; | |||
2535 | for (const auto &P : Arg.pack_elements()) { | |||
2536 | // When converting the deduced template argument, append it to the | |||
2537 | // general output list. We need to do this so that the template argument | |||
2538 | // checking logic has all of the prior template arguments available. | |||
2539 | DeducedTemplateArgument InnerArg(P); | |||
2540 | InnerArg.setDeducedFromArrayBound(Arg.wasDeducedFromArrayBound()); | |||
2541 | assert(InnerArg.getKind() != TemplateArgument::Pack &&((InnerArg.getKind() != TemplateArgument::Pack && "deduced nested pack" ) ? static_cast<void> (0) : __assert_fail ("InnerArg.getKind() != TemplateArgument::Pack && \"deduced nested pack\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2542, __PRETTY_FUNCTION__)) | |||
2542 | "deduced nested pack")((InnerArg.getKind() != TemplateArgument::Pack && "deduced nested pack" ) ? static_cast<void> (0) : __assert_fail ("InnerArg.getKind() != TemplateArgument::Pack && \"deduced nested pack\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2542, __PRETTY_FUNCTION__)); | |||
2543 | if (P.isNull()) { | |||
2544 | // We deduced arguments for some elements of this pack, but not for | |||
2545 | // all of them. This happens if we get a conditionally-non-deduced | |||
2546 | // context in a pack expansion (such as an overload set in one of the | |||
2547 | // arguments). | |||
2548 | S.Diag(Param->getLocation(), | |||
2549 | diag::err_template_arg_deduced_incomplete_pack) | |||
2550 | << Arg << Param; | |||
2551 | return true; | |||
2552 | } | |||
2553 | if (ConvertArg(InnerArg, PackedArgsBuilder.size())) | |||
2554 | return true; | |||
2555 | ||||
2556 | // Move the converted template argument into our argument pack. | |||
2557 | PackedArgsBuilder.push_back(Output.pop_back_val()); | |||
2558 | } | |||
2559 | ||||
2560 | // If the pack is empty, we still need to substitute into the parameter | |||
2561 | // itself, in case that substitution fails. | |||
2562 | if (PackedArgsBuilder.empty()) { | |||
2563 | LocalInstantiationScope Scope(S); | |||
2564 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Output); | |||
2565 | MultiLevelTemplateArgumentList Args(TemplateArgs); | |||
2566 | ||||
2567 | if (auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) { | |||
2568 | Sema::InstantiatingTemplate Inst(S, Template->getLocation(), Template, | |||
2569 | NTTP, Output, | |||
2570 | Template->getSourceRange()); | |||
2571 | if (Inst.isInvalid() || | |||
2572 | S.SubstType(NTTP->getType(), Args, NTTP->getLocation(), | |||
2573 | NTTP->getDeclName()).isNull()) | |||
2574 | return true; | |||
2575 | } else if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(Param)) { | |||
2576 | Sema::InstantiatingTemplate Inst(S, Template->getLocation(), Template, | |||
2577 | TTP, Output, | |||
2578 | Template->getSourceRange()); | |||
2579 | if (Inst.isInvalid() || !S.SubstDecl(TTP, S.CurContext, Args)) | |||
2580 | return true; | |||
2581 | } | |||
2582 | // For type parameters, no substitution is ever required. | |||
2583 | } | |||
2584 | ||||
2585 | // Create the resulting argument pack. | |||
2586 | Output.push_back( | |||
2587 | TemplateArgument::CreatePackCopy(S.Context, PackedArgsBuilder)); | |||
2588 | return false; | |||
2589 | } | |||
2590 | ||||
2591 | return ConvertArg(Arg, 0); | |||
2592 | } | |||
2593 | ||||
2594 | // FIXME: This should not be a template, but | |||
2595 | // ClassTemplatePartialSpecializationDecl sadly does not derive from | |||
2596 | // TemplateDecl. | |||
2597 | template<typename TemplateDeclT> | |||
2598 | static Sema::TemplateDeductionResult ConvertDeducedTemplateArguments( | |||
2599 | Sema &S, TemplateDeclT *Template, bool IsDeduced, | |||
2600 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
2601 | TemplateDeductionInfo &Info, SmallVectorImpl<TemplateArgument> &Builder, | |||
2602 | LocalInstantiationScope *CurrentInstantiationScope = nullptr, | |||
2603 | unsigned NumAlreadyConverted = 0, bool PartialOverloading = false) { | |||
2604 | TemplateParameterList *TemplateParams = Template->getTemplateParameters(); | |||
2605 | ||||
2606 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { | |||
2607 | NamedDecl *Param = TemplateParams->getParam(I); | |||
2608 | ||||
2609 | // C++0x [temp.arg.explicit]p3: | |||
2610 | // A trailing template parameter pack (14.5.3) not otherwise deduced will | |||
2611 | // be deduced to an empty sequence of template arguments. | |||
2612 | // FIXME: Where did the word "trailing" come from? | |||
2613 | if (Deduced[I].isNull() && Param->isTemplateParameterPack()) { | |||
2614 | if (auto Result = PackDeductionScope(S, TemplateParams, Deduced, Info, I) | |||
2615 | .finish(/*TreatNoDeductionsAsNonDeduced*/false)) | |||
2616 | return Result; | |||
2617 | } | |||
2618 | ||||
2619 | if (!Deduced[I].isNull()) { | |||
2620 | if (I < NumAlreadyConverted) { | |||
2621 | // We may have had explicitly-specified template arguments for a | |||
2622 | // template parameter pack (that may or may not have been extended | |||
2623 | // via additional deduced arguments). | |||
2624 | if (Param->isParameterPack() && CurrentInstantiationScope && | |||
2625 | CurrentInstantiationScope->getPartiallySubstitutedPack() == Param) { | |||
2626 | // Forget the partially-substituted pack; its substitution is now | |||
2627 | // complete. | |||
2628 | CurrentInstantiationScope->ResetPartiallySubstitutedPack(); | |||
2629 | // We still need to check the argument in case it was extended by | |||
2630 | // deduction. | |||
2631 | } else { | |||
2632 | // We have already fully type-checked and converted this | |||
2633 | // argument, because it was explicitly-specified. Just record the | |||
2634 | // presence of this argument. | |||
2635 | Builder.push_back(Deduced[I]); | |||
2636 | continue; | |||
2637 | } | |||
2638 | } | |||
2639 | ||||
2640 | // We may have deduced this argument, so it still needs to be | |||
2641 | // checked and converted. | |||
2642 | if (ConvertDeducedTemplateArgument(S, Param, Deduced[I], Template, Info, | |||
2643 | IsDeduced, Builder)) { | |||
2644 | Info.Param = makeTemplateParameter(Param); | |||
2645 | // FIXME: These template arguments are temporary. Free them! | |||
2646 | Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder)); | |||
2647 | return Sema::TDK_SubstitutionFailure; | |||
2648 | } | |||
2649 | ||||
2650 | continue; | |||
2651 | } | |||
2652 | ||||
2653 | // Substitute into the default template argument, if available. | |||
2654 | bool HasDefaultArg = false; | |||
2655 | TemplateDecl *TD = dyn_cast<TemplateDecl>(Template); | |||
2656 | if (!TD) { | |||
2657 | assert(isa<ClassTemplatePartialSpecializationDecl>(Template) ||((isa<ClassTemplatePartialSpecializationDecl>(Template) || isa<VarTemplatePartialSpecializationDecl>(Template) ) ? static_cast<void> (0) : __assert_fail ("isa<ClassTemplatePartialSpecializationDecl>(Template) || isa<VarTemplatePartialSpecializationDecl>(Template)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2658, __PRETTY_FUNCTION__)) | |||
2658 | isa<VarTemplatePartialSpecializationDecl>(Template))((isa<ClassTemplatePartialSpecializationDecl>(Template) || isa<VarTemplatePartialSpecializationDecl>(Template) ) ? static_cast<void> (0) : __assert_fail ("isa<ClassTemplatePartialSpecializationDecl>(Template) || isa<VarTemplatePartialSpecializationDecl>(Template)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 2658, __PRETTY_FUNCTION__)); | |||
2659 | return Sema::TDK_Incomplete; | |||
2660 | } | |||
2661 | ||||
2662 | TemplateArgumentLoc DefArg = S.SubstDefaultTemplateArgumentIfAvailable( | |||
2663 | TD, TD->getLocation(), TD->getSourceRange().getEnd(), Param, Builder, | |||
2664 | HasDefaultArg); | |||
2665 | ||||
2666 | // If there was no default argument, deduction is incomplete. | |||
2667 | if (DefArg.getArgument().isNull()) { | |||
2668 | Info.Param = makeTemplateParameter( | |||
2669 | const_cast<NamedDecl *>(TemplateParams->getParam(I))); | |||
2670 | Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder)); | |||
2671 | if (PartialOverloading) break; | |||
2672 | ||||
2673 | return HasDefaultArg ? Sema::TDK_SubstitutionFailure | |||
2674 | : Sema::TDK_Incomplete; | |||
2675 | } | |||
2676 | ||||
2677 | // Check whether we can actually use the default argument. | |||
2678 | if (S.CheckTemplateArgument(Param, DefArg, TD, TD->getLocation(), | |||
2679 | TD->getSourceRange().getEnd(), 0, Builder, | |||
2680 | Sema::CTAK_Specified)) { | |||
2681 | Info.Param = makeTemplateParameter( | |||
2682 | const_cast<NamedDecl *>(TemplateParams->getParam(I))); | |||
2683 | // FIXME: These template arguments are temporary. Free them! | |||
2684 | Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder)); | |||
2685 | return Sema::TDK_SubstitutionFailure; | |||
2686 | } | |||
2687 | ||||
2688 | // If we get here, we successfully used the default template argument. | |||
2689 | } | |||
2690 | ||||
2691 | return Sema::TDK_Success; | |||
2692 | } | |||
2693 | ||||
2694 | static DeclContext *getAsDeclContextOrEnclosing(Decl *D) { | |||
2695 | if (auto *DC = dyn_cast<DeclContext>(D)) | |||
2696 | return DC; | |||
2697 | return D->getDeclContext(); | |||
2698 | } | |||
2699 | ||||
2700 | template<typename T> struct IsPartialSpecialization { | |||
2701 | static constexpr bool value = false; | |||
2702 | }; | |||
2703 | template<> | |||
2704 | struct IsPartialSpecialization<ClassTemplatePartialSpecializationDecl> { | |||
2705 | static constexpr bool value = true; | |||
2706 | }; | |||
2707 | template<> | |||
2708 | struct IsPartialSpecialization<VarTemplatePartialSpecializationDecl> { | |||
2709 | static constexpr bool value = true; | |||
2710 | }; | |||
2711 | ||||
2712 | /// Complete template argument deduction for a partial specialization. | |||
2713 | template <typename T> | |||
2714 | static typename std::enable_if<IsPartialSpecialization<T>::value, | |||
2715 | Sema::TemplateDeductionResult>::type | |||
2716 | FinishTemplateArgumentDeduction( | |||
2717 | Sema &S, T *Partial, bool IsPartialOrdering, | |||
2718 | const TemplateArgumentList &TemplateArgs, | |||
2719 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
2720 | TemplateDeductionInfo &Info) { | |||
2721 | // Unevaluated SFINAE context. | |||
2722 | EnterExpressionEvaluationContext Unevaluated( | |||
2723 | S, Sema::ExpressionEvaluationContext::Unevaluated); | |||
2724 | Sema::SFINAETrap Trap(S); | |||
2725 | ||||
2726 | Sema::ContextRAII SavedContext(S, getAsDeclContextOrEnclosing(Partial)); | |||
2727 | ||||
2728 | // C++ [temp.deduct.type]p2: | |||
2729 | // [...] or if any template argument remains neither deduced nor | |||
2730 | // explicitly specified, template argument deduction fails. | |||
2731 | SmallVector<TemplateArgument, 4> Builder; | |||
2732 | if (auto Result = ConvertDeducedTemplateArguments( | |||
2733 | S, Partial, IsPartialOrdering, Deduced, Info, Builder)) | |||
2734 | return Result; | |||
2735 | ||||
2736 | // Form the template argument list from the deduced template arguments. | |||
2737 | TemplateArgumentList *DeducedArgumentList | |||
2738 | = TemplateArgumentList::CreateCopy(S.Context, Builder); | |||
2739 | ||||
2740 | Info.reset(DeducedArgumentList); | |||
2741 | ||||
2742 | // Substitute the deduced template arguments into the template | |||
2743 | // arguments of the class template partial specialization, and | |||
2744 | // verify that the instantiated template arguments are both valid | |||
2745 | // and are equivalent to the template arguments originally provided | |||
2746 | // to the class template. | |||
2747 | LocalInstantiationScope InstScope(S); | |||
2748 | auto *Template = Partial->getSpecializedTemplate(); | |||
2749 | const ASTTemplateArgumentListInfo *PartialTemplArgInfo = | |||
2750 | Partial->getTemplateArgsAsWritten(); | |||
2751 | const TemplateArgumentLoc *PartialTemplateArgs = | |||
2752 | PartialTemplArgInfo->getTemplateArgs(); | |||
2753 | ||||
2754 | TemplateArgumentListInfo InstArgs(PartialTemplArgInfo->LAngleLoc, | |||
2755 | PartialTemplArgInfo->RAngleLoc); | |||
2756 | ||||
2757 | if (S.Subst(PartialTemplateArgs, PartialTemplArgInfo->NumTemplateArgs, | |||
2758 | InstArgs, MultiLevelTemplateArgumentList(*DeducedArgumentList))) { | |||
2759 | unsigned ArgIdx = InstArgs.size(), ParamIdx = ArgIdx; | |||
2760 | if (ParamIdx >= Partial->getTemplateParameters()->size()) | |||
2761 | ParamIdx = Partial->getTemplateParameters()->size() - 1; | |||
2762 | ||||
2763 | Decl *Param = const_cast<NamedDecl *>( | |||
2764 | Partial->getTemplateParameters()->getParam(ParamIdx)); | |||
2765 | Info.Param = makeTemplateParameter(Param); | |||
2766 | Info.FirstArg = PartialTemplateArgs[ArgIdx].getArgument(); | |||
2767 | return Sema::TDK_SubstitutionFailure; | |||
2768 | } | |||
2769 | ||||
2770 | SmallVector<TemplateArgument, 4> ConvertedInstArgs; | |||
2771 | if (S.CheckTemplateArgumentList(Template, Partial->getLocation(), InstArgs, | |||
2772 | false, ConvertedInstArgs)) | |||
2773 | return Sema::TDK_SubstitutionFailure; | |||
2774 | ||||
2775 | TemplateParameterList *TemplateParams = Template->getTemplateParameters(); | |||
2776 | for (unsigned I = 0, E = TemplateParams->size(); I != E; ++I) { | |||
2777 | TemplateArgument InstArg = ConvertedInstArgs.data()[I]; | |||
2778 | if (!isSameTemplateArg(S.Context, TemplateArgs[I], InstArg)) { | |||
2779 | Info.Param = makeTemplateParameter(TemplateParams->getParam(I)); | |||
2780 | Info.FirstArg = TemplateArgs[I]; | |||
2781 | Info.SecondArg = InstArg; | |||
2782 | return Sema::TDK_NonDeducedMismatch; | |||
2783 | } | |||
2784 | } | |||
2785 | ||||
2786 | if (Trap.hasErrorOccurred()) | |||
2787 | return Sema::TDK_SubstitutionFailure; | |||
2788 | ||||
2789 | return Sema::TDK_Success; | |||
2790 | } | |||
2791 | ||||
2792 | /// Complete template argument deduction for a class or variable template, | |||
2793 | /// when partial ordering against a partial specialization. | |||
2794 | // FIXME: Factor out duplication with partial specialization version above. | |||
2795 | static Sema::TemplateDeductionResult FinishTemplateArgumentDeduction( | |||
2796 | Sema &S, TemplateDecl *Template, bool PartialOrdering, | |||
2797 | const TemplateArgumentList &TemplateArgs, | |||
2798 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
2799 | TemplateDeductionInfo &Info) { | |||
2800 | // Unevaluated SFINAE context. | |||
2801 | EnterExpressionEvaluationContext Unevaluated( | |||
2802 | S, Sema::ExpressionEvaluationContext::Unevaluated); | |||
2803 | Sema::SFINAETrap Trap(S); | |||
2804 | ||||
2805 | Sema::ContextRAII SavedContext(S, getAsDeclContextOrEnclosing(Template)); | |||
2806 | ||||
2807 | // C++ [temp.deduct.type]p2: | |||
2808 | // [...] or if any template argument remains neither deduced nor | |||
2809 | // explicitly specified, template argument deduction fails. | |||
2810 | SmallVector<TemplateArgument, 4> Builder; | |||
2811 | if (auto Result = ConvertDeducedTemplateArguments( | |||
2812 | S, Template, /*IsDeduced*/PartialOrdering, Deduced, Info, Builder)) | |||
2813 | return Result; | |||
2814 | ||||
2815 | // Check that we produced the correct argument list. | |||
2816 | TemplateParameterList *TemplateParams = Template->getTemplateParameters(); | |||
2817 | for (unsigned I = 0, E = TemplateParams->size(); I != E; ++I) { | |||
2818 | TemplateArgument InstArg = Builder[I]; | |||
2819 | if (!isSameTemplateArg(S.Context, TemplateArgs[I], InstArg, | |||
2820 | /*PackExpansionMatchesPack*/true)) { | |||
2821 | Info.Param = makeTemplateParameter(TemplateParams->getParam(I)); | |||
2822 | Info.FirstArg = TemplateArgs[I]; | |||
2823 | Info.SecondArg = InstArg; | |||
2824 | return Sema::TDK_NonDeducedMismatch; | |||
2825 | } | |||
2826 | } | |||
2827 | ||||
2828 | if (Trap.hasErrorOccurred()) | |||
2829 | return Sema::TDK_SubstitutionFailure; | |||
2830 | ||||
2831 | return Sema::TDK_Success; | |||
2832 | } | |||
2833 | ||||
2834 | ||||
2835 | /// Perform template argument deduction to determine whether | |||
2836 | /// the given template arguments match the given class template | |||
2837 | /// partial specialization per C++ [temp.class.spec.match]. | |||
2838 | Sema::TemplateDeductionResult | |||
2839 | Sema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial, | |||
2840 | const TemplateArgumentList &TemplateArgs, | |||
2841 | TemplateDeductionInfo &Info) { | |||
2842 | if (Partial->isInvalidDecl()) | |||
2843 | return TDK_Invalid; | |||
2844 | ||||
2845 | // C++ [temp.class.spec.match]p2: | |||
2846 | // A partial specialization matches a given actual template | |||
2847 | // argument list if the template arguments of the partial | |||
2848 | // specialization can be deduced from the actual template argument | |||
2849 | // list (14.8.2). | |||
2850 | ||||
2851 | // Unevaluated SFINAE context. | |||
2852 | EnterExpressionEvaluationContext Unevaluated( | |||
2853 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | |||
2854 | SFINAETrap Trap(*this); | |||
2855 | ||||
2856 | SmallVector<DeducedTemplateArgument, 4> Deduced; | |||
2857 | Deduced.resize(Partial->getTemplateParameters()->size()); | |||
2858 | if (TemplateDeductionResult Result | |||
2859 | = ::DeduceTemplateArguments(*this, | |||
2860 | Partial->getTemplateParameters(), | |||
2861 | Partial->getTemplateArgs(), | |||
2862 | TemplateArgs, Info, Deduced)) | |||
2863 | return Result; | |||
2864 | ||||
2865 | SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(), Deduced.end()); | |||
2866 | InstantiatingTemplate Inst(*this, Info.getLocation(), Partial, DeducedArgs, | |||
2867 | Info); | |||
2868 | if (Inst.isInvalid()) | |||
2869 | return TDK_InstantiationDepth; | |||
2870 | ||||
2871 | if (Trap.hasErrorOccurred()) | |||
2872 | return Sema::TDK_SubstitutionFailure; | |||
2873 | ||||
2874 | return ::FinishTemplateArgumentDeduction( | |||
2875 | *this, Partial, /*PartialOrdering=*/false, TemplateArgs, Deduced, Info); | |||
2876 | } | |||
2877 | ||||
2878 | /// Perform template argument deduction to determine whether | |||
2879 | /// the given template arguments match the given variable template | |||
2880 | /// partial specialization per C++ [temp.class.spec.match]. | |||
2881 | Sema::TemplateDeductionResult | |||
2882 | Sema::DeduceTemplateArguments(VarTemplatePartialSpecializationDecl *Partial, | |||
2883 | const TemplateArgumentList &TemplateArgs, | |||
2884 | TemplateDeductionInfo &Info) { | |||
2885 | if (Partial->isInvalidDecl()) | |||
2886 | return TDK_Invalid; | |||
2887 | ||||
2888 | // C++ [temp.class.spec.match]p2: | |||
2889 | // A partial specialization matches a given actual template | |||
2890 | // argument list if the template arguments of the partial | |||
2891 | // specialization can be deduced from the actual template argument | |||
2892 | // list (14.8.2). | |||
2893 | ||||
2894 | // Unevaluated SFINAE context. | |||
2895 | EnterExpressionEvaluationContext Unevaluated( | |||
2896 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | |||
2897 | SFINAETrap Trap(*this); | |||
2898 | ||||
2899 | SmallVector<DeducedTemplateArgument, 4> Deduced; | |||
2900 | Deduced.resize(Partial->getTemplateParameters()->size()); | |||
2901 | if (TemplateDeductionResult Result = ::DeduceTemplateArguments( | |||
2902 | *this, Partial->getTemplateParameters(), Partial->getTemplateArgs(), | |||
2903 | TemplateArgs, Info, Deduced)) | |||
2904 | return Result; | |||
2905 | ||||
2906 | SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(), Deduced.end()); | |||
2907 | InstantiatingTemplate Inst(*this, Info.getLocation(), Partial, DeducedArgs, | |||
2908 | Info); | |||
2909 | if (Inst.isInvalid()) | |||
2910 | return TDK_InstantiationDepth; | |||
2911 | ||||
2912 | if (Trap.hasErrorOccurred()) | |||
2913 | return Sema::TDK_SubstitutionFailure; | |||
2914 | ||||
2915 | return ::FinishTemplateArgumentDeduction( | |||
2916 | *this, Partial, /*PartialOrdering=*/false, TemplateArgs, Deduced, Info); | |||
2917 | } | |||
2918 | ||||
2919 | /// Determine whether the given type T is a simple-template-id type. | |||
2920 | static bool isSimpleTemplateIdType(QualType T) { | |||
2921 | if (const TemplateSpecializationType *Spec | |||
2922 | = T->getAs<TemplateSpecializationType>()) | |||
2923 | return Spec->getTemplateName().getAsTemplateDecl() != nullptr; | |||
2924 | ||||
2925 | // C++17 [temp.local]p2: | |||
2926 | // the injected-class-name [...] is equivalent to the template-name followed | |||
2927 | // by the template-arguments of the class template specialization or partial | |||
2928 | // specialization enclosed in <> | |||
2929 | // ... which means it's equivalent to a simple-template-id. | |||
2930 | // | |||
2931 | // This only arises during class template argument deduction for a copy | |||
2932 | // deduction candidate, where it permits slicing. | |||
2933 | if (T->getAs<InjectedClassNameType>()) | |||
2934 | return true; | |||
2935 | ||||
2936 | return false; | |||
2937 | } | |||
2938 | ||||
2939 | /// Substitute the explicitly-provided template arguments into the | |||
2940 | /// given function template according to C++ [temp.arg.explicit]. | |||
2941 | /// | |||
2942 | /// \param FunctionTemplate the function template into which the explicit | |||
2943 | /// template arguments will be substituted. | |||
2944 | /// | |||
2945 | /// \param ExplicitTemplateArgs the explicitly-specified template | |||
2946 | /// arguments. | |||
2947 | /// | |||
2948 | /// \param Deduced the deduced template arguments, which will be populated | |||
2949 | /// with the converted and checked explicit template arguments. | |||
2950 | /// | |||
2951 | /// \param ParamTypes will be populated with the instantiated function | |||
2952 | /// parameters. | |||
2953 | /// | |||
2954 | /// \param FunctionType if non-NULL, the result type of the function template | |||
2955 | /// will also be instantiated and the pointed-to value will be updated with | |||
2956 | /// the instantiated function type. | |||
2957 | /// | |||
2958 | /// \param Info if substitution fails for any reason, this object will be | |||
2959 | /// populated with more information about the failure. | |||
2960 | /// | |||
2961 | /// \returns TDK_Success if substitution was successful, or some failure | |||
2962 | /// condition. | |||
2963 | Sema::TemplateDeductionResult | |||
2964 | Sema::SubstituteExplicitTemplateArguments( | |||
2965 | FunctionTemplateDecl *FunctionTemplate, | |||
2966 | TemplateArgumentListInfo &ExplicitTemplateArgs, | |||
2967 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
2968 | SmallVectorImpl<QualType> &ParamTypes, | |||
2969 | QualType *FunctionType, | |||
2970 | TemplateDeductionInfo &Info) { | |||
2971 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); | |||
2972 | TemplateParameterList *TemplateParams | |||
2973 | = FunctionTemplate->getTemplateParameters(); | |||
2974 | ||||
2975 | if (ExplicitTemplateArgs.size() == 0) { | |||
2976 | // No arguments to substitute; just copy over the parameter types and | |||
2977 | // fill in the function type. | |||
2978 | for (auto P : Function->parameters()) | |||
2979 | ParamTypes.push_back(P->getType()); | |||
2980 | ||||
2981 | if (FunctionType) | |||
2982 | *FunctionType = Function->getType(); | |||
2983 | return TDK_Success; | |||
2984 | } | |||
2985 | ||||
2986 | // Unevaluated SFINAE context. | |||
2987 | EnterExpressionEvaluationContext Unevaluated( | |||
2988 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | |||
2989 | SFINAETrap Trap(*this); | |||
2990 | ||||
2991 | // C++ [temp.arg.explicit]p3: | |||
2992 | // Template arguments that are present shall be specified in the | |||
2993 | // declaration order of their corresponding template-parameters. The | |||
2994 | // template argument list shall not specify more template-arguments than | |||
2995 | // there are corresponding template-parameters. | |||
2996 | SmallVector<TemplateArgument, 4> Builder; | |||
2997 | ||||
2998 | // Enter a new template instantiation context where we check the | |||
2999 | // explicitly-specified template arguments against this function template, | |||
3000 | // and then substitute them into the function parameter types. | |||
3001 | SmallVector<TemplateArgument, 4> DeducedArgs; | |||
3002 | InstantiatingTemplate Inst( | |||
3003 | *this, Info.getLocation(), FunctionTemplate, DeducedArgs, | |||
3004 | CodeSynthesisContext::ExplicitTemplateArgumentSubstitution, Info); | |||
3005 | if (Inst.isInvalid()) | |||
3006 | return TDK_InstantiationDepth; | |||
3007 | ||||
3008 | if (CheckTemplateArgumentList(FunctionTemplate, SourceLocation(), | |||
3009 | ExplicitTemplateArgs, true, Builder, false) || | |||
3010 | Trap.hasErrorOccurred()) { | |||
3011 | unsigned Index = Builder.size(); | |||
3012 | if (Index >= TemplateParams->size()) | |||
3013 | return TDK_SubstitutionFailure; | |||
3014 | Info.Param = makeTemplateParameter(TemplateParams->getParam(Index)); | |||
3015 | return TDK_InvalidExplicitArguments; | |||
3016 | } | |||
3017 | ||||
3018 | // Form the template argument list from the explicitly-specified | |||
3019 | // template arguments. | |||
3020 | TemplateArgumentList *ExplicitArgumentList | |||
3021 | = TemplateArgumentList::CreateCopy(Context, Builder); | |||
3022 | Info.setExplicitArgs(ExplicitArgumentList); | |||
3023 | ||||
3024 | // Template argument deduction and the final substitution should be | |||
3025 | // done in the context of the templated declaration. Explicit | |||
3026 | // argument substitution, on the other hand, needs to happen in the | |||
3027 | // calling context. | |||
3028 | ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); | |||
3029 | ||||
3030 | // If we deduced template arguments for a template parameter pack, | |||
3031 | // note that the template argument pack is partially substituted and record | |||
3032 | // the explicit template arguments. They'll be used as part of deduction | |||
3033 | // for this template parameter pack. | |||
3034 | unsigned PartiallySubstitutedPackIndex = -1u; | |||
3035 | if (!Builder.empty()) { | |||
3036 | const TemplateArgument &Arg = Builder.back(); | |||
3037 | if (Arg.getKind() == TemplateArgument::Pack) { | |||
3038 | auto *Param = TemplateParams->getParam(Builder.size() - 1); | |||
3039 | // If this is a fully-saturated fixed-size pack, it should be | |||
3040 | // fully-substituted, not partially-substituted. | |||
3041 | Optional<unsigned> Expansions = getExpandedPackSize(Param); | |||
3042 | if (!Expansions || Arg.pack_size() < *Expansions) { | |||
3043 | PartiallySubstitutedPackIndex = Builder.size() - 1; | |||
3044 | CurrentInstantiationScope->SetPartiallySubstitutedPack( | |||
3045 | Param, Arg.pack_begin(), Arg.pack_size()); | |||
3046 | } | |||
3047 | } | |||
3048 | } | |||
3049 | ||||
3050 | const FunctionProtoType *Proto | |||
3051 | = Function->getType()->getAs<FunctionProtoType>(); | |||
3052 | assert(Proto && "Function template does not have a prototype?")((Proto && "Function template does not have a prototype?" ) ? static_cast<void> (0) : __assert_fail ("Proto && \"Function template does not have a prototype?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 3052, __PRETTY_FUNCTION__)); | |||
3053 | ||||
3054 | // Isolate our substituted parameters from our caller. | |||
3055 | LocalInstantiationScope InstScope(*this, /*MergeWithOuterScope*/true); | |||
3056 | ||||
3057 | ExtParameterInfoBuilder ExtParamInfos; | |||
3058 | ||||
3059 | // Instantiate the types of each of the function parameters given the | |||
3060 | // explicitly-specified template arguments. If the function has a trailing | |||
3061 | // return type, substitute it after the arguments to ensure we substitute | |||
3062 | // in lexical order. | |||
3063 | if (Proto->hasTrailingReturn()) { | |||
3064 | if (SubstParmTypes(Function->getLocation(), Function->parameters(), | |||
3065 | Proto->getExtParameterInfosOrNull(), | |||
3066 | MultiLevelTemplateArgumentList(*ExplicitArgumentList), | |||
3067 | ParamTypes, /*params*/ nullptr, ExtParamInfos)) | |||
3068 | return TDK_SubstitutionFailure; | |||
3069 | } | |||
3070 | ||||
3071 | // Instantiate the return type. | |||
3072 | QualType ResultType; | |||
3073 | { | |||
3074 | // C++11 [expr.prim.general]p3: | |||
3075 | // If a declaration declares a member function or member function | |||
3076 | // template of a class X, the expression this is a prvalue of type | |||
3077 | // "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq | |||
3078 | // and the end of the function-definition, member-declarator, or | |||
3079 | // declarator. | |||
3080 | Qualifiers ThisTypeQuals; | |||
3081 | CXXRecordDecl *ThisContext = nullptr; | |||
3082 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Function)) { | |||
3083 | ThisContext = Method->getParent(); | |||
3084 | ThisTypeQuals = Method->getMethodQualifiers(); | |||
3085 | } | |||
3086 | ||||
3087 | CXXThisScopeRAII ThisScope(*this, ThisContext, ThisTypeQuals, | |||
3088 | getLangOpts().CPlusPlus11); | |||
3089 | ||||
3090 | ResultType = | |||
3091 | SubstType(Proto->getReturnType(), | |||
3092 | MultiLevelTemplateArgumentList(*ExplicitArgumentList), | |||
3093 | Function->getTypeSpecStartLoc(), Function->getDeclName()); | |||
3094 | if (ResultType.isNull() || Trap.hasErrorOccurred()) | |||
3095 | return TDK_SubstitutionFailure; | |||
3096 | } | |||
3097 | ||||
3098 | // Instantiate the types of each of the function parameters given the | |||
3099 | // explicitly-specified template arguments if we didn't do so earlier. | |||
3100 | if (!Proto->hasTrailingReturn() && | |||
3101 | SubstParmTypes(Function->getLocation(), Function->parameters(), | |||
3102 | Proto->getExtParameterInfosOrNull(), | |||
3103 | MultiLevelTemplateArgumentList(*ExplicitArgumentList), | |||
3104 | ParamTypes, /*params*/ nullptr, ExtParamInfos)) | |||
3105 | return TDK_SubstitutionFailure; | |||
3106 | ||||
3107 | if (FunctionType) { | |||
3108 | auto EPI = Proto->getExtProtoInfo(); | |||
3109 | EPI.ExtParameterInfos = ExtParamInfos.getPointerOrNull(ParamTypes.size()); | |||
3110 | ||||
3111 | // In C++1z onwards, exception specifications are part of the function type, | |||
3112 | // so substitution into the type must also substitute into the exception | |||
3113 | // specification. | |||
3114 | SmallVector<QualType, 4> ExceptionStorage; | |||
3115 | if (getLangOpts().CPlusPlus17 && | |||
3116 | SubstExceptionSpec( | |||
3117 | Function->getLocation(), EPI.ExceptionSpec, ExceptionStorage, | |||
3118 | MultiLevelTemplateArgumentList(*ExplicitArgumentList))) | |||
3119 | return TDK_SubstitutionFailure; | |||
3120 | ||||
3121 | *FunctionType = BuildFunctionType(ResultType, ParamTypes, | |||
3122 | Function->getLocation(), | |||
3123 | Function->getDeclName(), | |||
3124 | EPI); | |||
3125 | if (FunctionType->isNull() || Trap.hasErrorOccurred()) | |||
3126 | return TDK_SubstitutionFailure; | |||
3127 | } | |||
3128 | ||||
3129 | // C++ [temp.arg.explicit]p2: | |||
3130 | // Trailing template arguments that can be deduced (14.8.2) may be | |||
3131 | // omitted from the list of explicit template-arguments. If all of the | |||
3132 | // template arguments can be deduced, they may all be omitted; in this | |||
3133 | // case, the empty template argument list <> itself may also be omitted. | |||
3134 | // | |||
3135 | // Take all of the explicitly-specified arguments and put them into | |||
3136 | // the set of deduced template arguments. The partially-substituted | |||
3137 | // parameter pack, however, will be set to NULL since the deduction | |||
3138 | // mechanism handles the partially-substituted argument pack directly. | |||
3139 | Deduced.reserve(TemplateParams->size()); | |||
3140 | for (unsigned I = 0, N = ExplicitArgumentList->size(); I != N; ++I) { | |||
3141 | const TemplateArgument &Arg = ExplicitArgumentList->get(I); | |||
3142 | if (I == PartiallySubstitutedPackIndex) | |||
3143 | Deduced.push_back(DeducedTemplateArgument()); | |||
3144 | else | |||
3145 | Deduced.push_back(Arg); | |||
3146 | } | |||
3147 | ||||
3148 | return TDK_Success; | |||
3149 | } | |||
3150 | ||||
3151 | /// Check whether the deduced argument type for a call to a function | |||
3152 | /// template matches the actual argument type per C++ [temp.deduct.call]p4. | |||
3153 | static Sema::TemplateDeductionResult | |||
3154 | CheckOriginalCallArgDeduction(Sema &S, TemplateDeductionInfo &Info, | |||
3155 | Sema::OriginalCallArg OriginalArg, | |||
3156 | QualType DeducedA) { | |||
3157 | ASTContext &Context = S.Context; | |||
3158 | ||||
3159 | auto Failed = [&]() -> Sema::TemplateDeductionResult { | |||
3160 | Info.FirstArg = TemplateArgument(DeducedA); | |||
3161 | Info.SecondArg = TemplateArgument(OriginalArg.OriginalArgType); | |||
3162 | Info.CallArgIndex = OriginalArg.ArgIdx; | |||
3163 | return OriginalArg.DecomposedParam ? Sema::TDK_DeducedMismatchNested | |||
3164 | : Sema::TDK_DeducedMismatch; | |||
3165 | }; | |||
3166 | ||||
3167 | QualType A = OriginalArg.OriginalArgType; | |||
3168 | QualType OriginalParamType = OriginalArg.OriginalParamType; | |||
3169 | ||||
3170 | // Check for type equality (top-level cv-qualifiers are ignored). | |||
3171 | if (Context.hasSameUnqualifiedType(A, DeducedA)) | |||
3172 | return Sema::TDK_Success; | |||
3173 | ||||
3174 | // Strip off references on the argument types; they aren't needed for | |||
3175 | // the following checks. | |||
3176 | if (const ReferenceType *DeducedARef = DeducedA->getAs<ReferenceType>()) | |||
3177 | DeducedA = DeducedARef->getPointeeType(); | |||
3178 | if (const ReferenceType *ARef = A->getAs<ReferenceType>()) | |||
3179 | A = ARef->getPointeeType(); | |||
3180 | ||||
3181 | // C++ [temp.deduct.call]p4: | |||
3182 | // [...] However, there are three cases that allow a difference: | |||
3183 | // - If the original P is a reference type, the deduced A (i.e., the | |||
3184 | // type referred to by the reference) can be more cv-qualified than | |||
3185 | // the transformed A. | |||
3186 | if (const ReferenceType *OriginalParamRef | |||
3187 | = OriginalParamType->getAs<ReferenceType>()) { | |||
3188 | // We don't want to keep the reference around any more. | |||
3189 | OriginalParamType = OriginalParamRef->getPointeeType(); | |||
3190 | ||||
3191 | // FIXME: Resolve core issue (no number yet): if the original P is a | |||
3192 | // reference type and the transformed A is function type "noexcept F", | |||
3193 | // the deduced A can be F. | |||
3194 | QualType Tmp; | |||
3195 | if (A->isFunctionType() && S.IsFunctionConversion(A, DeducedA, Tmp)) | |||
3196 | return Sema::TDK_Success; | |||
3197 | ||||
3198 | Qualifiers AQuals = A.getQualifiers(); | |||
3199 | Qualifiers DeducedAQuals = DeducedA.getQualifiers(); | |||
3200 | ||||
3201 | // Under Objective-C++ ARC, the deduced type may have implicitly | |||
3202 | // been given strong or (when dealing with a const reference) | |||
3203 | // unsafe_unretained lifetime. If so, update the original | |||
3204 | // qualifiers to include this lifetime. | |||
3205 | if (S.getLangOpts().ObjCAutoRefCount && | |||
3206 | ((DeducedAQuals.getObjCLifetime() == Qualifiers::OCL_Strong && | |||
3207 | AQuals.getObjCLifetime() == Qualifiers::OCL_None) || | |||
3208 | (DeducedAQuals.hasConst() && | |||
3209 | DeducedAQuals.getObjCLifetime() == Qualifiers::OCL_ExplicitNone))) { | |||
3210 | AQuals.setObjCLifetime(DeducedAQuals.getObjCLifetime()); | |||
3211 | } | |||
3212 | ||||
3213 | if (AQuals == DeducedAQuals) { | |||
3214 | // Qualifiers match; there's nothing to do. | |||
3215 | } else if (!DeducedAQuals.compatiblyIncludes(AQuals)) { | |||
3216 | return Failed(); | |||
3217 | } else { | |||
3218 | // Qualifiers are compatible, so have the argument type adopt the | |||
3219 | // deduced argument type's qualifiers as if we had performed the | |||
3220 | // qualification conversion. | |||
3221 | A = Context.getQualifiedType(A.getUnqualifiedType(), DeducedAQuals); | |||
3222 | } | |||
3223 | } | |||
3224 | ||||
3225 | // - The transformed A can be another pointer or pointer to member | |||
3226 | // type that can be converted to the deduced A via a function pointer | |||
3227 | // conversion and/or a qualification conversion. | |||
3228 | // | |||
3229 | // Also allow conversions which merely strip __attribute__((noreturn)) from | |||
3230 | // function types (recursively). | |||
3231 | bool ObjCLifetimeConversion = false; | |||
3232 | QualType ResultTy; | |||
3233 | if ((A->isAnyPointerType() || A->isMemberPointerType()) && | |||
3234 | (S.IsQualificationConversion(A, DeducedA, false, | |||
3235 | ObjCLifetimeConversion) || | |||
3236 | S.IsFunctionConversion(A, DeducedA, ResultTy))) | |||
3237 | return Sema::TDK_Success; | |||
3238 | ||||
3239 | // - If P is a class and P has the form simple-template-id, then the | |||
3240 | // transformed A can be a derived class of the deduced A. [...] | |||
3241 | // [...] Likewise, if P is a pointer to a class of the form | |||
3242 | // simple-template-id, the transformed A can be a pointer to a | |||
3243 | // derived class pointed to by the deduced A. | |||
3244 | if (const PointerType *OriginalParamPtr | |||
3245 | = OriginalParamType->getAs<PointerType>()) { | |||
3246 | if (const PointerType *DeducedAPtr = DeducedA->getAs<PointerType>()) { | |||
3247 | if (const PointerType *APtr = A->getAs<PointerType>()) { | |||
3248 | if (A->getPointeeType()->isRecordType()) { | |||
3249 | OriginalParamType = OriginalParamPtr->getPointeeType(); | |||
3250 | DeducedA = DeducedAPtr->getPointeeType(); | |||
3251 | A = APtr->getPointeeType(); | |||
3252 | } | |||
3253 | } | |||
3254 | } | |||
3255 | } | |||
3256 | ||||
3257 | if (Context.hasSameUnqualifiedType(A, DeducedA)) | |||
3258 | return Sema::TDK_Success; | |||
3259 | ||||
3260 | if (A->isRecordType() && isSimpleTemplateIdType(OriginalParamType) && | |||
3261 | S.IsDerivedFrom(Info.getLocation(), A, DeducedA)) | |||
3262 | return Sema::TDK_Success; | |||
3263 | ||||
3264 | return Failed(); | |||
3265 | } | |||
3266 | ||||
3267 | /// Find the pack index for a particular parameter index in an instantiation of | |||
3268 | /// a function template with specific arguments. | |||
3269 | /// | |||
3270 | /// \return The pack index for whichever pack produced this parameter, or -1 | |||
3271 | /// if this was not produced by a parameter. Intended to be used as the | |||
3272 | /// ArgumentPackSubstitutionIndex for further substitutions. | |||
3273 | // FIXME: We should track this in OriginalCallArgs so we don't need to | |||
3274 | // reconstruct it here. | |||
3275 | static unsigned getPackIndexForParam(Sema &S, | |||
3276 | FunctionTemplateDecl *FunctionTemplate, | |||
3277 | const MultiLevelTemplateArgumentList &Args, | |||
3278 | unsigned ParamIdx) { | |||
3279 | unsigned Idx = 0; | |||
3280 | for (auto *PD : FunctionTemplate->getTemplatedDecl()->parameters()) { | |||
3281 | if (PD->isParameterPack()) { | |||
3282 | unsigned NumExpansions = | |||
3283 | S.getNumArgumentsInExpansion(PD->getType(), Args).getValueOr(1); | |||
3284 | if (Idx + NumExpansions > ParamIdx) | |||
3285 | return ParamIdx - Idx; | |||
3286 | Idx += NumExpansions; | |||
3287 | } else { | |||
3288 | if (Idx == ParamIdx) | |||
3289 | return -1; // Not a pack expansion | |||
3290 | ++Idx; | |||
3291 | } | |||
3292 | } | |||
3293 | ||||
3294 | llvm_unreachable("parameter index would not be produced from template")::llvm::llvm_unreachable_internal("parameter index would not be produced from template" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 3294); | |||
3295 | } | |||
3296 | ||||
3297 | /// Finish template argument deduction for a function template, | |||
3298 | /// checking the deduced template arguments for completeness and forming | |||
3299 | /// the function template specialization. | |||
3300 | /// | |||
3301 | /// \param OriginalCallArgs If non-NULL, the original call arguments against | |||
3302 | /// which the deduced argument types should be compared. | |||
3303 | Sema::TemplateDeductionResult Sema::FinishTemplateArgumentDeduction( | |||
3304 | FunctionTemplateDecl *FunctionTemplate, | |||
3305 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
3306 | unsigned NumExplicitlySpecified, FunctionDecl *&Specialization, | |||
3307 | TemplateDeductionInfo &Info, | |||
3308 | SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs, | |||
3309 | bool PartialOverloading, llvm::function_ref<bool()> CheckNonDependent) { | |||
3310 | // Unevaluated SFINAE context. | |||
3311 | EnterExpressionEvaluationContext Unevaluated( | |||
3312 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | |||
3313 | SFINAETrap Trap(*this); | |||
3314 | ||||
3315 | // Enter a new template instantiation context while we instantiate the | |||
3316 | // actual function declaration. | |||
3317 | SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(), Deduced.end()); | |||
3318 | InstantiatingTemplate Inst( | |||
3319 | *this, Info.getLocation(), FunctionTemplate, DeducedArgs, | |||
3320 | CodeSynthesisContext::DeducedTemplateArgumentSubstitution, Info); | |||
3321 | if (Inst.isInvalid()) | |||
3322 | return TDK_InstantiationDepth; | |||
3323 | ||||
3324 | ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); | |||
3325 | ||||
3326 | // C++ [temp.deduct.type]p2: | |||
3327 | // [...] or if any template argument remains neither deduced nor | |||
3328 | // explicitly specified, template argument deduction fails. | |||
3329 | SmallVector<TemplateArgument, 4> Builder; | |||
3330 | if (auto Result = ConvertDeducedTemplateArguments( | |||
3331 | *this, FunctionTemplate, /*IsDeduced*/true, Deduced, Info, Builder, | |||
3332 | CurrentInstantiationScope, NumExplicitlySpecified, | |||
3333 | PartialOverloading)) | |||
3334 | return Result; | |||
3335 | ||||
3336 | // C++ [temp.deduct.call]p10: [DR1391] | |||
3337 | // If deduction succeeds for all parameters that contain | |||
3338 | // template-parameters that participate in template argument deduction, | |||
3339 | // and all template arguments are explicitly specified, deduced, or | |||
3340 | // obtained from default template arguments, remaining parameters are then | |||
3341 | // compared with the corresponding arguments. For each remaining parameter | |||
3342 | // P with a type that was non-dependent before substitution of any | |||
3343 | // explicitly-specified template arguments, if the corresponding argument | |||
3344 | // A cannot be implicitly converted to P, deduction fails. | |||
3345 | if (CheckNonDependent()) | |||
3346 | return TDK_NonDependentConversionFailure; | |||
3347 | ||||
3348 | // Form the template argument list from the deduced template arguments. | |||
3349 | TemplateArgumentList *DeducedArgumentList | |||
3350 | = TemplateArgumentList::CreateCopy(Context, Builder); | |||
3351 | Info.reset(DeducedArgumentList); | |||
3352 | ||||
3353 | // Substitute the deduced template arguments into the function template | |||
3354 | // declaration to produce the function template specialization. | |||
3355 | DeclContext *Owner = FunctionTemplate->getDeclContext(); | |||
3356 | if (FunctionTemplate->getFriendObjectKind()) | |||
3357 | Owner = FunctionTemplate->getLexicalDeclContext(); | |||
3358 | MultiLevelTemplateArgumentList SubstArgs(*DeducedArgumentList); | |||
3359 | Specialization = cast_or_null<FunctionDecl>( | |||
3360 | SubstDecl(FunctionTemplate->getTemplatedDecl(), Owner, SubstArgs)); | |||
3361 | if (!Specialization || Specialization->isInvalidDecl()) | |||
3362 | return TDK_SubstitutionFailure; | |||
3363 | ||||
3364 | assert(Specialization->getPrimaryTemplate()->getCanonicalDecl() ==((Specialization->getPrimaryTemplate()->getCanonicalDecl () == FunctionTemplate->getCanonicalDecl()) ? static_cast< void> (0) : __assert_fail ("Specialization->getPrimaryTemplate()->getCanonicalDecl() == FunctionTemplate->getCanonicalDecl()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 3365, __PRETTY_FUNCTION__)) | |||
3365 | FunctionTemplate->getCanonicalDecl())((Specialization->getPrimaryTemplate()->getCanonicalDecl () == FunctionTemplate->getCanonicalDecl()) ? static_cast< void> (0) : __assert_fail ("Specialization->getPrimaryTemplate()->getCanonicalDecl() == FunctionTemplate->getCanonicalDecl()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 3365, __PRETTY_FUNCTION__)); | |||
3366 | ||||
3367 | // If the template argument list is owned by the function template | |||
3368 | // specialization, release it. | |||
3369 | if (Specialization->getTemplateSpecializationArgs() == DeducedArgumentList && | |||
3370 | !Trap.hasErrorOccurred()) | |||
3371 | Info.take(); | |||
3372 | ||||
3373 | // There may have been an error that did not prevent us from constructing a | |||
3374 | // declaration. Mark the declaration invalid and return with a substitution | |||
3375 | // failure. | |||
3376 | if (Trap.hasErrorOccurred()) { | |||
3377 | Specialization->setInvalidDecl(true); | |||
3378 | return TDK_SubstitutionFailure; | |||
3379 | } | |||
3380 | ||||
3381 | if (OriginalCallArgs) { | |||
3382 | // C++ [temp.deduct.call]p4: | |||
3383 | // In general, the deduction process attempts to find template argument | |||
3384 | // values that will make the deduced A identical to A (after the type A | |||
3385 | // is transformed as described above). [...] | |||
3386 | llvm::SmallDenseMap<std::pair<unsigned, QualType>, QualType> DeducedATypes; | |||
3387 | for (unsigned I = 0, N = OriginalCallArgs->size(); I != N; ++I) { | |||
3388 | OriginalCallArg OriginalArg = (*OriginalCallArgs)[I]; | |||
3389 | ||||
3390 | auto ParamIdx = OriginalArg.ArgIdx; | |||
3391 | if (ParamIdx >= Specialization->getNumParams()) | |||
3392 | // FIXME: This presumably means a pack ended up smaller than we | |||
3393 | // expected while deducing. Should this not result in deduction | |||
3394 | // failure? Can it even happen? | |||
3395 | continue; | |||
3396 | ||||
3397 | QualType DeducedA; | |||
3398 | if (!OriginalArg.DecomposedParam) { | |||
3399 | // P is one of the function parameters, just look up its substituted | |||
3400 | // type. | |||
3401 | DeducedA = Specialization->getParamDecl(ParamIdx)->getType(); | |||
3402 | } else { | |||
3403 | // P is a decomposed element of a parameter corresponding to a | |||
3404 | // braced-init-list argument. Substitute back into P to find the | |||
3405 | // deduced A. | |||
3406 | QualType &CacheEntry = | |||
3407 | DeducedATypes[{ParamIdx, OriginalArg.OriginalParamType}]; | |||
3408 | if (CacheEntry.isNull()) { | |||
3409 | ArgumentPackSubstitutionIndexRAII PackIndex( | |||
3410 | *this, getPackIndexForParam(*this, FunctionTemplate, SubstArgs, | |||
3411 | ParamIdx)); | |||
3412 | CacheEntry = | |||
3413 | SubstType(OriginalArg.OriginalParamType, SubstArgs, | |||
3414 | Specialization->getTypeSpecStartLoc(), | |||
3415 | Specialization->getDeclName()); | |||
3416 | } | |||
3417 | DeducedA = CacheEntry; | |||
3418 | } | |||
3419 | ||||
3420 | if (auto TDK = | |||
3421 | CheckOriginalCallArgDeduction(*this, Info, OriginalArg, DeducedA)) | |||
3422 | return TDK; | |||
3423 | } | |||
3424 | } | |||
3425 | ||||
3426 | // If we suppressed any diagnostics while performing template argument | |||
3427 | // deduction, and if we haven't already instantiated this declaration, | |||
3428 | // keep track of these diagnostics. They'll be emitted if this specialization | |||
3429 | // is actually used. | |||
3430 | if (Info.diag_begin() != Info.diag_end()) { | |||
3431 | SuppressedDiagnosticsMap::iterator | |||
3432 | Pos = SuppressedDiagnostics.find(Specialization->getCanonicalDecl()); | |||
3433 | if (Pos == SuppressedDiagnostics.end()) | |||
3434 | SuppressedDiagnostics[Specialization->getCanonicalDecl()] | |||
3435 | .append(Info.diag_begin(), Info.diag_end()); | |||
3436 | } | |||
3437 | ||||
3438 | return TDK_Success; | |||
3439 | } | |||
3440 | ||||
3441 | /// Gets the type of a function for template-argument-deducton | |||
3442 | /// purposes when it's considered as part of an overload set. | |||
3443 | static QualType GetTypeOfFunction(Sema &S, const OverloadExpr::FindResult &R, | |||
3444 | FunctionDecl *Fn) { | |||
3445 | // We may need to deduce the return type of the function now. | |||
3446 | if (S.getLangOpts().CPlusPlus14 && Fn->getReturnType()->isUndeducedType() && | |||
3447 | S.DeduceReturnType(Fn, R.Expression->getExprLoc(), /*Diagnose*/ false)) | |||
3448 | return {}; | |||
3449 | ||||
3450 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) | |||
3451 | if (Method->isInstance()) { | |||
3452 | // An instance method that's referenced in a form that doesn't | |||
3453 | // look like a member pointer is just invalid. | |||
3454 | if (!R.HasFormOfMemberPointer) | |||
3455 | return {}; | |||
3456 | ||||
3457 | return S.Context.getMemberPointerType(Fn->getType(), | |||
3458 | S.Context.getTypeDeclType(Method->getParent()).getTypePtr()); | |||
3459 | } | |||
3460 | ||||
3461 | if (!R.IsAddressOfOperand) return Fn->getType(); | |||
3462 | return S.Context.getPointerType(Fn->getType()); | |||
3463 | } | |||
3464 | ||||
3465 | /// Apply the deduction rules for overload sets. | |||
3466 | /// | |||
3467 | /// \return the null type if this argument should be treated as an | |||
3468 | /// undeduced context | |||
3469 | static QualType | |||
3470 | ResolveOverloadForDeduction(Sema &S, TemplateParameterList *TemplateParams, | |||
3471 | Expr *Arg, QualType ParamType, | |||
3472 | bool ParamWasReference) { | |||
3473 | ||||
3474 | OverloadExpr::FindResult R = OverloadExpr::find(Arg); | |||
3475 | ||||
3476 | OverloadExpr *Ovl = R.Expression; | |||
3477 | ||||
3478 | // C++0x [temp.deduct.call]p4 | |||
3479 | unsigned TDF = 0; | |||
3480 | if (ParamWasReference) | |||
3481 | TDF |= TDF_ParamWithReferenceType; | |||
3482 | if (R.IsAddressOfOperand) | |||
3483 | TDF |= TDF_IgnoreQualifiers; | |||
3484 | ||||
3485 | // C++0x [temp.deduct.call]p6: | |||
3486 | // When P is a function type, pointer to function type, or pointer | |||
3487 | // to member function type: | |||
3488 | ||||
3489 | if (!ParamType->isFunctionType() && | |||
3490 | !ParamType->isFunctionPointerType() && | |||
3491 | !ParamType->isMemberFunctionPointerType()) { | |||
3492 | if (Ovl->hasExplicitTemplateArgs()) { | |||
3493 | // But we can still look for an explicit specialization. | |||
3494 | if (FunctionDecl *ExplicitSpec | |||
3495 | = S.ResolveSingleFunctionTemplateSpecialization(Ovl)) | |||
3496 | return GetTypeOfFunction(S, R, ExplicitSpec); | |||
3497 | } | |||
3498 | ||||
3499 | DeclAccessPair DAP; | |||
3500 | if (FunctionDecl *Viable = | |||
3501 | S.resolveAddressOfOnlyViableOverloadCandidate(Arg, DAP)) | |||
3502 | return GetTypeOfFunction(S, R, Viable); | |||
3503 | ||||
3504 | return {}; | |||
3505 | } | |||
3506 | ||||
3507 | // Gather the explicit template arguments, if any. | |||
3508 | TemplateArgumentListInfo ExplicitTemplateArgs; | |||
3509 | if (Ovl->hasExplicitTemplateArgs()) | |||
3510 | Ovl->copyTemplateArgumentsInto(ExplicitTemplateArgs); | |||
3511 | QualType Match; | |||
3512 | for (UnresolvedSetIterator I = Ovl->decls_begin(), | |||
3513 | E = Ovl->decls_end(); I != E; ++I) { | |||
3514 | NamedDecl *D = (*I)->getUnderlyingDecl(); | |||
3515 | ||||
3516 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) { | |||
3517 | // - If the argument is an overload set containing one or more | |||
3518 | // function templates, the parameter is treated as a | |||
3519 | // non-deduced context. | |||
3520 | if (!Ovl->hasExplicitTemplateArgs()) | |||
3521 | return {}; | |||
3522 | ||||
3523 | // Otherwise, see if we can resolve a function type | |||
3524 | FunctionDecl *Specialization = nullptr; | |||
3525 | TemplateDeductionInfo Info(Ovl->getNameLoc()); | |||
3526 | if (S.DeduceTemplateArguments(FunTmpl, &ExplicitTemplateArgs, | |||
3527 | Specialization, Info)) | |||
3528 | continue; | |||
3529 | ||||
3530 | D = Specialization; | |||
3531 | } | |||
3532 | ||||
3533 | FunctionDecl *Fn = cast<FunctionDecl>(D); | |||
3534 | QualType ArgType = GetTypeOfFunction(S, R, Fn); | |||
3535 | if (ArgType.isNull()) continue; | |||
3536 | ||||
3537 | // Function-to-pointer conversion. | |||
3538 | if (!ParamWasReference && ParamType->isPointerType() && | |||
3539 | ArgType->isFunctionType()) | |||
3540 | ArgType = S.Context.getPointerType(ArgType); | |||
3541 | ||||
3542 | // - If the argument is an overload set (not containing function | |||
3543 | // templates), trial argument deduction is attempted using each | |||
3544 | // of the members of the set. If deduction succeeds for only one | |||
3545 | // of the overload set members, that member is used as the | |||
3546 | // argument value for the deduction. If deduction succeeds for | |||
3547 | // more than one member of the overload set the parameter is | |||
3548 | // treated as a non-deduced context. | |||
3549 | ||||
3550 | // We do all of this in a fresh context per C++0x [temp.deduct.type]p2: | |||
3551 | // Type deduction is done independently for each P/A pair, and | |||
3552 | // the deduced template argument values are then combined. | |||
3553 | // So we do not reject deductions which were made elsewhere. | |||
3554 | SmallVector<DeducedTemplateArgument, 8> | |||
3555 | Deduced(TemplateParams->size()); | |||
3556 | TemplateDeductionInfo Info(Ovl->getNameLoc()); | |||
3557 | Sema::TemplateDeductionResult Result | |||
3558 | = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, ParamType, | |||
3559 | ArgType, Info, Deduced, TDF); | |||
3560 | if (Result) continue; | |||
3561 | if (!Match.isNull()) | |||
3562 | return {}; | |||
3563 | Match = ArgType; | |||
3564 | } | |||
3565 | ||||
3566 | return Match; | |||
3567 | } | |||
3568 | ||||
3569 | /// Perform the adjustments to the parameter and argument types | |||
3570 | /// described in C++ [temp.deduct.call]. | |||
3571 | /// | |||
3572 | /// \returns true if the caller should not attempt to perform any template | |||
3573 | /// argument deduction based on this P/A pair because the argument is an | |||
3574 | /// overloaded function set that could not be resolved. | |||
3575 | static bool AdjustFunctionParmAndArgTypesForDeduction( | |||
3576 | Sema &S, TemplateParameterList *TemplateParams, unsigned FirstInnerIndex, | |||
3577 | QualType &ParamType, QualType &ArgType, Expr *Arg, unsigned &TDF) { | |||
3578 | // C++0x [temp.deduct.call]p3: | |||
3579 | // If P is a cv-qualified type, the top level cv-qualifiers of P's type | |||
3580 | // are ignored for type deduction. | |||
3581 | if (ParamType.hasQualifiers()) | |||
3582 | ParamType = ParamType.getUnqualifiedType(); | |||
3583 | ||||
3584 | // [...] If P is a reference type, the type referred to by P is | |||
3585 | // used for type deduction. | |||
3586 | const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>(); | |||
3587 | if (ParamRefType) | |||
3588 | ParamType = ParamRefType->getPointeeType(); | |||
3589 | ||||
3590 | // Overload sets usually make this parameter an undeduced context, | |||
3591 | // but there are sometimes special circumstances. Typically | |||
3592 | // involving a template-id-expr. | |||
3593 | if (ArgType == S.Context.OverloadTy) { | |||
3594 | ArgType = ResolveOverloadForDeduction(S, TemplateParams, | |||
3595 | Arg, ParamType, | |||
3596 | ParamRefType != nullptr); | |||
3597 | if (ArgType.isNull()) | |||
3598 | return true; | |||
3599 | } | |||
3600 | ||||
3601 | if (ParamRefType) { | |||
3602 | // If the argument has incomplete array type, try to complete its type. | |||
3603 | if (ArgType->isIncompleteArrayType()) { | |||
3604 | S.completeExprArrayBound(Arg); | |||
3605 | ArgType = Arg->getType(); | |||
3606 | } | |||
3607 | ||||
3608 | // C++1z [temp.deduct.call]p3: | |||
3609 | // If P is a forwarding reference and the argument is an lvalue, the type | |||
3610 | // "lvalue reference to A" is used in place of A for type deduction. | |||
3611 | if (isForwardingReference(QualType(ParamRefType, 0), FirstInnerIndex) && | |||
3612 | Arg->isLValue()) | |||
3613 | ArgType = S.Context.getLValueReferenceType(ArgType); | |||
3614 | } else { | |||
3615 | // C++ [temp.deduct.call]p2: | |||
3616 | // If P is not a reference type: | |||
3617 | // - If A is an array type, the pointer type produced by the | |||
3618 | // array-to-pointer standard conversion (4.2) is used in place of | |||
3619 | // A for type deduction; otherwise, | |||
3620 | if (ArgType->isArrayType()) | |||
3621 | ArgType = S.Context.getArrayDecayedType(ArgType); | |||
3622 | // - If A is a function type, the pointer type produced by the | |||
3623 | // function-to-pointer standard conversion (4.3) is used in place | |||
3624 | // of A for type deduction; otherwise, | |||
3625 | else if (ArgType->isFunctionType()) | |||
3626 | ArgType = S.Context.getPointerType(ArgType); | |||
3627 | else { | |||
3628 | // - If A is a cv-qualified type, the top level cv-qualifiers of A's | |||
3629 | // type are ignored for type deduction. | |||
3630 | ArgType = ArgType.getUnqualifiedType(); | |||
3631 | } | |||
3632 | } | |||
3633 | ||||
3634 | // C++0x [temp.deduct.call]p4: | |||
3635 | // In general, the deduction process attempts to find template argument | |||
3636 | // values that will make the deduced A identical to A (after the type A | |||
3637 | // is transformed as described above). [...] | |||
3638 | TDF = TDF_SkipNonDependent; | |||
3639 | ||||
3640 | // - If the original P is a reference type, the deduced A (i.e., the | |||
3641 | // type referred to by the reference) can be more cv-qualified than | |||
3642 | // the transformed A. | |||
3643 | if (ParamRefType) | |||
3644 | TDF |= TDF_ParamWithReferenceType; | |||
3645 | // - The transformed A can be another pointer or pointer to member | |||
3646 | // type that can be converted to the deduced A via a qualification | |||
3647 | // conversion (4.4). | |||
3648 | if (ArgType->isPointerType() || ArgType->isMemberPointerType() || | |||
3649 | ArgType->isObjCObjectPointerType()) | |||
3650 | TDF |= TDF_IgnoreQualifiers; | |||
3651 | // - If P is a class and P has the form simple-template-id, then the | |||
3652 | // transformed A can be a derived class of the deduced A. Likewise, | |||
3653 | // if P is a pointer to a class of the form simple-template-id, the | |||
3654 | // transformed A can be a pointer to a derived class pointed to by | |||
3655 | // the deduced A. | |||
3656 | if (isSimpleTemplateIdType(ParamType) || | |||
3657 | (isa<PointerType>(ParamType) && | |||
3658 | isSimpleTemplateIdType( | |||
3659 | ParamType->getAs<PointerType>()->getPointeeType()))) | |||
3660 | TDF |= TDF_DerivedClass; | |||
3661 | ||||
3662 | return false; | |||
3663 | } | |||
3664 | ||||
3665 | static bool | |||
3666 | hasDeducibleTemplateParameters(Sema &S, FunctionTemplateDecl *FunctionTemplate, | |||
3667 | QualType T); | |||
3668 | ||||
3669 | static Sema::TemplateDeductionResult DeduceTemplateArgumentsFromCallArgument( | |||
3670 | Sema &S, TemplateParameterList *TemplateParams, unsigned FirstInnerIndex, | |||
3671 | QualType ParamType, Expr *Arg, TemplateDeductionInfo &Info, | |||
3672 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
3673 | SmallVectorImpl<Sema::OriginalCallArg> &OriginalCallArgs, | |||
3674 | bool DecomposedParam, unsigned ArgIdx, unsigned TDF); | |||
3675 | ||||
3676 | /// Attempt template argument deduction from an initializer list | |||
3677 | /// deemed to be an argument in a function call. | |||
3678 | static Sema::TemplateDeductionResult DeduceFromInitializerList( | |||
3679 | Sema &S, TemplateParameterList *TemplateParams, QualType AdjustedParamType, | |||
3680 | InitListExpr *ILE, TemplateDeductionInfo &Info, | |||
3681 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
3682 | SmallVectorImpl<Sema::OriginalCallArg> &OriginalCallArgs, unsigned ArgIdx, | |||
3683 | unsigned TDF) { | |||
3684 | // C++ [temp.deduct.call]p1: (CWG 1591) | |||
3685 | // If removing references and cv-qualifiers from P gives | |||
3686 | // std::initializer_list<P0> or P0[N] for some P0 and N and the argument is | |||
3687 | // a non-empty initializer list, then deduction is performed instead for | |||
3688 | // each element of the initializer list, taking P0 as a function template | |||
3689 | // parameter type and the initializer element as its argument | |||
3690 | // | |||
3691 | // We've already removed references and cv-qualifiers here. | |||
3692 | if (!ILE->getNumInits()) | |||
3693 | return Sema::TDK_Success; | |||
3694 | ||||
3695 | QualType ElTy; | |||
3696 | auto *ArrTy = S.Context.getAsArrayType(AdjustedParamType); | |||
3697 | if (ArrTy) | |||
3698 | ElTy = ArrTy->getElementType(); | |||
3699 | else if (!S.isStdInitializerList(AdjustedParamType, &ElTy)) { | |||
3700 | // Otherwise, an initializer list argument causes the parameter to be | |||
3701 | // considered a non-deduced context | |||
3702 | return Sema::TDK_Success; | |||
3703 | } | |||
3704 | ||||
3705 | // Deduction only needs to be done for dependent types. | |||
3706 | if (ElTy->isDependentType()) { | |||
3707 | for (Expr *E : ILE->inits()) { | |||
3708 | if (auto Result = DeduceTemplateArgumentsFromCallArgument( | |||
3709 | S, TemplateParams, 0, ElTy, E, Info, Deduced, OriginalCallArgs, true, | |||
3710 | ArgIdx, TDF)) | |||
3711 | return Result; | |||
3712 | } | |||
3713 | } | |||
3714 | ||||
3715 | // in the P0[N] case, if N is a non-type template parameter, N is deduced | |||
3716 | // from the length of the initializer list. | |||
3717 | if (auto *DependentArrTy = dyn_cast_or_null<DependentSizedArrayType>(ArrTy)) { | |||
3718 | // Determine the array bound is something we can deduce. | |||
3719 | if (NonTypeTemplateParmDecl *NTTP = | |||
3720 | getDeducedParameterFromExpr(Info, DependentArrTy->getSizeExpr())) { | |||
3721 | // We can perform template argument deduction for the given non-type | |||
3722 | // template parameter. | |||
3723 | // C++ [temp.deduct.type]p13: | |||
3724 | // The type of N in the type T[N] is std::size_t. | |||
3725 | QualType T = S.Context.getSizeType(); | |||
3726 | llvm::APInt Size(S.Context.getIntWidth(T), ILE->getNumInits()); | |||
3727 | if (auto Result = DeduceNonTypeTemplateArgument( | |||
3728 | S, TemplateParams, NTTP, llvm::APSInt(Size), T, | |||
3729 | /*ArrayBound=*/true, Info, Deduced)) | |||
3730 | return Result; | |||
3731 | } | |||
3732 | } | |||
3733 | ||||
3734 | return Sema::TDK_Success; | |||
3735 | } | |||
3736 | ||||
3737 | /// Perform template argument deduction per [temp.deduct.call] for a | |||
3738 | /// single parameter / argument pair. | |||
3739 | static Sema::TemplateDeductionResult DeduceTemplateArgumentsFromCallArgument( | |||
3740 | Sema &S, TemplateParameterList *TemplateParams, unsigned FirstInnerIndex, | |||
3741 | QualType ParamType, Expr *Arg, TemplateDeductionInfo &Info, | |||
3742 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, | |||
3743 | SmallVectorImpl<Sema::OriginalCallArg> &OriginalCallArgs, | |||
3744 | bool DecomposedParam, unsigned ArgIdx, unsigned TDF) { | |||
3745 | QualType ArgType = Arg->getType(); | |||
3746 | QualType OrigParamType = ParamType; | |||
3747 | ||||
3748 | // If P is a reference type [...] | |||
3749 | // If P is a cv-qualified type [...] | |||
3750 | if (AdjustFunctionParmAndArgTypesForDeduction( | |||
3751 | S, TemplateParams, FirstInnerIndex, ParamType, ArgType, Arg, TDF)) | |||
3752 | return Sema::TDK_Success; | |||
3753 | ||||
3754 | // If [...] the argument is a non-empty initializer list [...] | |||
3755 | if (InitListExpr *ILE = dyn_cast<InitListExpr>(Arg)) | |||
3756 | return DeduceFromInitializerList(S, TemplateParams, ParamType, ILE, Info, | |||
3757 | Deduced, OriginalCallArgs, ArgIdx, TDF); | |||
3758 | ||||
3759 | // [...] the deduction process attempts to find template argument values | |||
3760 | // that will make the deduced A identical to A | |||
3761 | // | |||
3762 | // Keep track of the argument type and corresponding parameter index, | |||
3763 | // so we can check for compatibility between the deduced A and A. | |||
3764 | OriginalCallArgs.push_back( | |||
3765 | Sema::OriginalCallArg(OrigParamType, DecomposedParam, ArgIdx, ArgType)); | |||
3766 | return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, ParamType, | |||
3767 | ArgType, Info, Deduced, TDF); | |||
3768 | } | |||
3769 | ||||
3770 | /// Perform template argument deduction from a function call | |||
3771 | /// (C++ [temp.deduct.call]). | |||
3772 | /// | |||
3773 | /// \param FunctionTemplate the function template for which we are performing | |||
3774 | /// template argument deduction. | |||
3775 | /// | |||
3776 | /// \param ExplicitTemplateArgs the explicit template arguments provided | |||
3777 | /// for this call. | |||
3778 | /// | |||
3779 | /// \param Args the function call arguments | |||
3780 | /// | |||
3781 | /// \param Specialization if template argument deduction was successful, | |||
3782 | /// this will be set to the function template specialization produced by | |||
3783 | /// template argument deduction. | |||
3784 | /// | |||
3785 | /// \param Info the argument will be updated to provide additional information | |||
3786 | /// about template argument deduction. | |||
3787 | /// | |||
3788 | /// \param CheckNonDependent A callback to invoke to check conversions for | |||
3789 | /// non-dependent parameters, between deduction and substitution, per DR1391. | |||
3790 | /// If this returns true, substitution will be skipped and we return | |||
3791 | /// TDK_NonDependentConversionFailure. The callback is passed the parameter | |||
3792 | /// types (after substituting explicit template arguments). | |||
3793 | /// | |||
3794 | /// \returns the result of template argument deduction. | |||
3795 | Sema::TemplateDeductionResult Sema::DeduceTemplateArguments( | |||
3796 | FunctionTemplateDecl *FunctionTemplate, | |||
3797 | TemplateArgumentListInfo *ExplicitTemplateArgs, ArrayRef<Expr *> Args, | |||
3798 | FunctionDecl *&Specialization, TemplateDeductionInfo &Info, | |||
3799 | bool PartialOverloading, | |||
3800 | llvm::function_ref<bool(ArrayRef<QualType>)> CheckNonDependent) { | |||
3801 | if (FunctionTemplate->isInvalidDecl()) | |||
| ||||
3802 | return TDK_Invalid; | |||
3803 | ||||
3804 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); | |||
3805 | unsigned NumParams = Function->getNumParams(); | |||
3806 | ||||
3807 | unsigned FirstInnerIndex = getFirstInnerIndex(FunctionTemplate); | |||
3808 | ||||
3809 | // C++ [temp.deduct.call]p1: | |||
3810 | // Template argument deduction is done by comparing each function template | |||
3811 | // parameter type (call it P) with the type of the corresponding argument | |||
3812 | // of the call (call it A) as described below. | |||
3813 | if (Args.size() < Function->getMinRequiredArguments() && !PartialOverloading) | |||
3814 | return TDK_TooFewArguments; | |||
3815 | else if (TooManyArguments(NumParams, Args.size(), PartialOverloading)) { | |||
3816 | const FunctionProtoType *Proto | |||
3817 | = Function->getType()->getAs<FunctionProtoType>(); | |||
3818 | if (Proto->isTemplateVariadic()) | |||
3819 | /* Do nothing */; | |||
3820 | else if (!Proto->isVariadic()) | |||
3821 | return TDK_TooManyArguments; | |||
3822 | } | |||
3823 | ||||
3824 | // The types of the parameters from which we will perform template argument | |||
3825 | // deduction. | |||
3826 | LocalInstantiationScope InstScope(*this); | |||
3827 | TemplateParameterList *TemplateParams | |||
3828 | = FunctionTemplate->getTemplateParameters(); | |||
3829 | SmallVector<DeducedTemplateArgument, 4> Deduced; | |||
3830 | SmallVector<QualType, 8> ParamTypes; | |||
3831 | unsigned NumExplicitlySpecified = 0; | |||
3832 | if (ExplicitTemplateArgs) { | |||
3833 | TemplateDeductionResult Result = | |||
3834 | SubstituteExplicitTemplateArguments(FunctionTemplate, | |||
3835 | *ExplicitTemplateArgs, | |||
3836 | Deduced, | |||
3837 | ParamTypes, | |||
3838 | nullptr, | |||
3839 | Info); | |||
3840 | if (Result) | |||
3841 | return Result; | |||
3842 | ||||
3843 | NumExplicitlySpecified = Deduced.size(); | |||
3844 | } else { | |||
3845 | // Just fill in the parameter types from the function declaration. | |||
3846 | for (unsigned I = 0; I != NumParams; ++I) | |||
3847 | ParamTypes.push_back(Function->getParamDecl(I)->getType()); | |||
3848 | } | |||
3849 | ||||
3850 | SmallVector<OriginalCallArg, 8> OriginalCallArgs; | |||
3851 | ||||
3852 | // Deduce an argument of type ParamType from an expression with index ArgIdx. | |||
3853 | auto DeduceCallArgument = [&](QualType ParamType, unsigned ArgIdx) { | |||
3854 | // C++ [demp.deduct.call]p1: (DR1391) | |||
3855 | // Template argument deduction is done by comparing each function template | |||
3856 | // parameter that contains template-parameters that participate in | |||
3857 | // template argument deduction ... | |||
3858 | if (!hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) | |||
3859 | return Sema::TDK_Success; | |||
3860 | ||||
3861 | // ... with the type of the corresponding argument | |||
3862 | return DeduceTemplateArgumentsFromCallArgument( | |||
3863 | *this, TemplateParams, FirstInnerIndex, ParamType, Args[ArgIdx], Info, Deduced, | |||
3864 | OriginalCallArgs, /*Decomposed*/false, ArgIdx, /*TDF*/ 0); | |||
3865 | }; | |||
3866 | ||||
3867 | // Deduce template arguments from the function parameters. | |||
3868 | Deduced.resize(TemplateParams->size()); | |||
3869 | SmallVector<QualType, 8> ParamTypesForArgChecking; | |||
3870 | for (unsigned ParamIdx = 0, NumParamTypes = ParamTypes.size(), ArgIdx = 0; | |||
3871 | ParamIdx != NumParamTypes; ++ParamIdx) { | |||
3872 | QualType ParamType = ParamTypes[ParamIdx]; | |||
3873 | ||||
3874 | const PackExpansionType *ParamExpansion = | |||
3875 | dyn_cast<PackExpansionType>(ParamType); | |||
3876 | if (!ParamExpansion) { | |||
3877 | // Simple case: matching a function parameter to a function argument. | |||
3878 | if (ArgIdx >= Args.size()) | |||
3879 | break; | |||
3880 | ||||
3881 | ParamTypesForArgChecking.push_back(ParamType); | |||
3882 | if (auto Result = DeduceCallArgument(ParamType, ArgIdx++)) | |||
3883 | return Result; | |||
3884 | ||||
3885 | continue; | |||
3886 | } | |||
3887 | ||||
3888 | QualType ParamPattern = ParamExpansion->getPattern(); | |||
3889 | PackDeductionScope PackScope(*this, TemplateParams, Deduced, Info, | |||
3890 | ParamPattern); | |||
3891 | ||||
3892 | // C++0x [temp.deduct.call]p1: | |||
3893 | // For a function parameter pack that occurs at the end of the | |||
3894 | // parameter-declaration-list, the type A of each remaining argument of | |||
3895 | // the call is compared with the type P of the declarator-id of the | |||
3896 | // function parameter pack. Each comparison deduces template arguments | |||
3897 | // for subsequent positions in the template parameter packs expanded by | |||
3898 | // the function parameter pack. When a function parameter pack appears | |||
3899 | // in a non-deduced context [not at the end of the list], the type of | |||
3900 | // that parameter pack is never deduced. | |||
3901 | // | |||
3902 | // FIXME: The above rule allows the size of the parameter pack to change | |||
3903 | // after we skip it (in the non-deduced case). That makes no sense, so | |||
3904 | // we instead notionally deduce the pack against N arguments, where N is | |||
3905 | // the length of the explicitly-specified pack if it's expanded by the | |||
3906 | // parameter pack and 0 otherwise, and we treat each deduction as a | |||
3907 | // non-deduced context. | |||
3908 | if (ParamIdx + 1 == NumParamTypes || PackScope.hasFixedArity()) { | |||
3909 | for (; ArgIdx < Args.size() && PackScope.hasNextElement(); | |||
3910 | PackScope.nextPackElement(), ++ArgIdx) { | |||
3911 | ParamTypesForArgChecking.push_back(ParamPattern); | |||
3912 | if (auto Result = DeduceCallArgument(ParamPattern, ArgIdx)) | |||
3913 | return Result; | |||
3914 | } | |||
3915 | } else { | |||
3916 | // If the parameter type contains an explicitly-specified pack that we | |||
3917 | // could not expand, skip the number of parameters notionally created | |||
3918 | // by the expansion. | |||
3919 | Optional<unsigned> NumExpansions = ParamExpansion->getNumExpansions(); | |||
3920 | if (NumExpansions && !PackScope.isPartiallyExpanded()) { | |||
3921 | for (unsigned I = 0; I != *NumExpansions && ArgIdx < Args.size(); | |||
3922 | ++I, ++ArgIdx) { | |||
3923 | ParamTypesForArgChecking.push_back(ParamPattern); | |||
3924 | // FIXME: Should we add OriginalCallArgs for these? What if the | |||
3925 | // corresponding argument is a list? | |||
3926 | PackScope.nextPackElement(); | |||
3927 | } | |||
3928 | } | |||
3929 | } | |||
3930 | ||||
3931 | // Build argument packs for each of the parameter packs expanded by this | |||
3932 | // pack expansion. | |||
3933 | if (auto Result = PackScope.finish()) | |||
3934 | return Result; | |||
3935 | } | |||
3936 | ||||
3937 | // Capture the context in which the function call is made. This is the context | |||
3938 | // that is needed when the accessibility of template arguments is checked. | |||
3939 | DeclContext *CallingCtx = CurContext; | |||
3940 | ||||
3941 | return FinishTemplateArgumentDeduction( | |||
3942 | FunctionTemplate, Deduced, NumExplicitlySpecified, Specialization, Info, | |||
3943 | &OriginalCallArgs, PartialOverloading, [&, CallingCtx]() { | |||
3944 | ContextRAII SavedContext(*this, CallingCtx); | |||
3945 | return CheckNonDependent(ParamTypesForArgChecking); | |||
3946 | }); | |||
3947 | } | |||
3948 | ||||
3949 | QualType Sema::adjustCCAndNoReturn(QualType ArgFunctionType, | |||
3950 | QualType FunctionType, | |||
3951 | bool AdjustExceptionSpec) { | |||
3952 | if (ArgFunctionType.isNull()) | |||
3953 | return ArgFunctionType; | |||
3954 | ||||
3955 | const FunctionProtoType *FunctionTypeP = | |||
3956 | FunctionType->castAs<FunctionProtoType>(); | |||
3957 | const FunctionProtoType *ArgFunctionTypeP = | |||
3958 | ArgFunctionType->getAs<FunctionProtoType>(); | |||
3959 | ||||
3960 | FunctionProtoType::ExtProtoInfo EPI = ArgFunctionTypeP->getExtProtoInfo(); | |||
3961 | bool Rebuild = false; | |||
3962 | ||||
3963 | CallingConv CC = FunctionTypeP->getCallConv(); | |||
3964 | if (EPI.ExtInfo.getCC() != CC) { | |||
3965 | EPI.ExtInfo = EPI.ExtInfo.withCallingConv(CC); | |||
3966 | Rebuild = true; | |||
3967 | } | |||
3968 | ||||
3969 | bool NoReturn = FunctionTypeP->getNoReturnAttr(); | |||
3970 | if (EPI.ExtInfo.getNoReturn() != NoReturn) { | |||
3971 | EPI.ExtInfo = EPI.ExtInfo.withNoReturn(NoReturn); | |||
3972 | Rebuild = true; | |||
3973 | } | |||
3974 | ||||
3975 | if (AdjustExceptionSpec && (FunctionTypeP->hasExceptionSpec() || | |||
3976 | ArgFunctionTypeP->hasExceptionSpec())) { | |||
3977 | EPI.ExceptionSpec = FunctionTypeP->getExtProtoInfo().ExceptionSpec; | |||
3978 | Rebuild = true; | |||
3979 | } | |||
3980 | ||||
3981 | if (!Rebuild) | |||
3982 | return ArgFunctionType; | |||
3983 | ||||
3984 | return Context.getFunctionType(ArgFunctionTypeP->getReturnType(), | |||
3985 | ArgFunctionTypeP->getParamTypes(), EPI); | |||
3986 | } | |||
3987 | ||||
3988 | /// Deduce template arguments when taking the address of a function | |||
3989 | /// template (C++ [temp.deduct.funcaddr]) or matching a specialization to | |||
3990 | /// a template. | |||
3991 | /// | |||
3992 | /// \param FunctionTemplate the function template for which we are performing | |||
3993 | /// template argument deduction. | |||
3994 | /// | |||
3995 | /// \param ExplicitTemplateArgs the explicitly-specified template | |||
3996 | /// arguments. | |||
3997 | /// | |||
3998 | /// \param ArgFunctionType the function type that will be used as the | |||
3999 | /// "argument" type (A) when performing template argument deduction from the | |||
4000 | /// function template's function type. This type may be NULL, if there is no | |||
4001 | /// argument type to compare against, in C++0x [temp.arg.explicit]p3. | |||
4002 | /// | |||
4003 | /// \param Specialization if template argument deduction was successful, | |||
4004 | /// this will be set to the function template specialization produced by | |||
4005 | /// template argument deduction. | |||
4006 | /// | |||
4007 | /// \param Info the argument will be updated to provide additional information | |||
4008 | /// about template argument deduction. | |||
4009 | /// | |||
4010 | /// \param IsAddressOfFunction If \c true, we are deducing as part of taking | |||
4011 | /// the address of a function template per [temp.deduct.funcaddr] and | |||
4012 | /// [over.over]. If \c false, we are looking up a function template | |||
4013 | /// specialization based on its signature, per [temp.deduct.decl]. | |||
4014 | /// | |||
4015 | /// \returns the result of template argument deduction. | |||
4016 | Sema::TemplateDeductionResult Sema::DeduceTemplateArguments( | |||
4017 | FunctionTemplateDecl *FunctionTemplate, | |||
4018 | TemplateArgumentListInfo *ExplicitTemplateArgs, QualType ArgFunctionType, | |||
4019 | FunctionDecl *&Specialization, TemplateDeductionInfo &Info, | |||
4020 | bool IsAddressOfFunction) { | |||
4021 | if (FunctionTemplate->isInvalidDecl()) | |||
4022 | return TDK_Invalid; | |||
4023 | ||||
4024 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); | |||
4025 | TemplateParameterList *TemplateParams | |||
4026 | = FunctionTemplate->getTemplateParameters(); | |||
4027 | QualType FunctionType = Function->getType(); | |||
4028 | ||||
4029 | // Substitute any explicit template arguments. | |||
4030 | LocalInstantiationScope InstScope(*this); | |||
4031 | SmallVector<DeducedTemplateArgument, 4> Deduced; | |||
4032 | unsigned NumExplicitlySpecified = 0; | |||
4033 | SmallVector<QualType, 4> ParamTypes; | |||
4034 | if (ExplicitTemplateArgs) { | |||
4035 | if (TemplateDeductionResult Result | |||
4036 | = SubstituteExplicitTemplateArguments(FunctionTemplate, | |||
4037 | *ExplicitTemplateArgs, | |||
4038 | Deduced, ParamTypes, | |||
4039 | &FunctionType, Info)) | |||
4040 | return Result; | |||
4041 | ||||
4042 | NumExplicitlySpecified = Deduced.size(); | |||
4043 | } | |||
4044 | ||||
4045 | // When taking the address of a function, we require convertibility of | |||
4046 | // the resulting function type. Otherwise, we allow arbitrary mismatches | |||
4047 | // of calling convention and noreturn. | |||
4048 | if (!IsAddressOfFunction) | |||
4049 | ArgFunctionType = adjustCCAndNoReturn(ArgFunctionType, FunctionType, | |||
4050 | /*AdjustExceptionSpec*/false); | |||
4051 | ||||
4052 | // Unevaluated SFINAE context. | |||
4053 | EnterExpressionEvaluationContext Unevaluated( | |||
4054 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | |||
4055 | SFINAETrap Trap(*this); | |||
4056 | ||||
4057 | Deduced.resize(TemplateParams->size()); | |||
4058 | ||||
4059 | // If the function has a deduced return type, substitute it for a dependent | |||
4060 | // type so that we treat it as a non-deduced context in what follows. If we | |||
4061 | // are looking up by signature, the signature type should also have a deduced | |||
4062 | // return type, which we instead expect to exactly match. | |||
4063 | bool HasDeducedReturnType = false; | |||
4064 | if (getLangOpts().CPlusPlus14 && IsAddressOfFunction && | |||
4065 | Function->getReturnType()->getContainedAutoType()) { | |||
4066 | FunctionType = SubstAutoType(FunctionType, Context.DependentTy); | |||
4067 | HasDeducedReturnType = true; | |||
4068 | } | |||
4069 | ||||
4070 | if (!ArgFunctionType.isNull()) { | |||
4071 | unsigned TDF = | |||
4072 | TDF_TopLevelParameterTypeList | TDF_AllowCompatibleFunctionType; | |||
4073 | // Deduce template arguments from the function type. | |||
4074 | if (TemplateDeductionResult Result | |||
4075 | = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, | |||
4076 | FunctionType, ArgFunctionType, | |||
4077 | Info, Deduced, TDF)) | |||
4078 | return Result; | |||
4079 | } | |||
4080 | ||||
4081 | if (TemplateDeductionResult Result | |||
4082 | = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, | |||
4083 | NumExplicitlySpecified, | |||
4084 | Specialization, Info)) | |||
4085 | return Result; | |||
4086 | ||||
4087 | // If the function has a deduced return type, deduce it now, so we can check | |||
4088 | // that the deduced function type matches the requested type. | |||
4089 | if (HasDeducedReturnType && | |||
4090 | Specialization->getReturnType()->isUndeducedType() && | |||
4091 | DeduceReturnType(Specialization, Info.getLocation(), false)) | |||
4092 | return TDK_MiscellaneousDeductionFailure; | |||
4093 | ||||
4094 | // If the function has a dependent exception specification, resolve it now, | |||
4095 | // so we can check that the exception specification matches. | |||
4096 | auto *SpecializationFPT = | |||
4097 | Specialization->getType()->castAs<FunctionProtoType>(); | |||
4098 | if (getLangOpts().CPlusPlus17 && | |||
4099 | isUnresolvedExceptionSpec(SpecializationFPT->getExceptionSpecType()) && | |||
4100 | !ResolveExceptionSpec(Info.getLocation(), SpecializationFPT)) | |||
4101 | return TDK_MiscellaneousDeductionFailure; | |||
4102 | ||||
4103 | // Adjust the exception specification of the argument to match the | |||
4104 | // substituted and resolved type we just formed. (Calling convention and | |||
4105 | // noreturn can't be dependent, so we don't actually need this for them | |||
4106 | // right now.) | |||
4107 | QualType SpecializationType = Specialization->getType(); | |||
4108 | if (!IsAddressOfFunction) | |||
4109 | ArgFunctionType = adjustCCAndNoReturn(ArgFunctionType, SpecializationType, | |||
4110 | /*AdjustExceptionSpec*/true); | |||
4111 | ||||
4112 | // If the requested function type does not match the actual type of the | |||
4113 | // specialization with respect to arguments of compatible pointer to function | |||
4114 | // types, template argument deduction fails. | |||
4115 | if (!ArgFunctionType.isNull()) { | |||
4116 | if (IsAddressOfFunction && | |||
4117 | !isSameOrCompatibleFunctionType( | |||
4118 | Context.getCanonicalType(SpecializationType), | |||
4119 | Context.getCanonicalType(ArgFunctionType))) | |||
4120 | return TDK_MiscellaneousDeductionFailure; | |||
4121 | ||||
4122 | if (!IsAddressOfFunction && | |||
4123 | !Context.hasSameType(SpecializationType, ArgFunctionType)) | |||
4124 | return TDK_MiscellaneousDeductionFailure; | |||
4125 | } | |||
4126 | ||||
4127 | return TDK_Success; | |||
4128 | } | |||
4129 | ||||
4130 | /// Deduce template arguments for a templated conversion | |||
4131 | /// function (C++ [temp.deduct.conv]) and, if successful, produce a | |||
4132 | /// conversion function template specialization. | |||
4133 | Sema::TemplateDeductionResult | |||
4134 | Sema::DeduceTemplateArguments(FunctionTemplateDecl *ConversionTemplate, | |||
4135 | QualType ToType, | |||
4136 | CXXConversionDecl *&Specialization, | |||
4137 | TemplateDeductionInfo &Info) { | |||
4138 | if (ConversionTemplate->isInvalidDecl()) | |||
4139 | return TDK_Invalid; | |||
4140 | ||||
4141 | CXXConversionDecl *ConversionGeneric | |||
4142 | = cast<CXXConversionDecl>(ConversionTemplate->getTemplatedDecl()); | |||
4143 | ||||
4144 | QualType FromType = ConversionGeneric->getConversionType(); | |||
4145 | ||||
4146 | // Canonicalize the types for deduction. | |||
4147 | QualType P = Context.getCanonicalType(FromType); | |||
4148 | QualType A = Context.getCanonicalType(ToType); | |||
4149 | ||||
4150 | // C++0x [temp.deduct.conv]p2: | |||
4151 | // If P is a reference type, the type referred to by P is used for | |||
4152 | // type deduction. | |||
4153 | if (const ReferenceType *PRef = P->getAs<ReferenceType>()) | |||
4154 | P = PRef->getPointeeType(); | |||
4155 | ||||
4156 | // C++0x [temp.deduct.conv]p4: | |||
4157 | // [...] If A is a reference type, the type referred to by A is used | |||
4158 | // for type deduction. | |||
4159 | if (const ReferenceType *ARef = A->getAs<ReferenceType>()) { | |||
4160 | A = ARef->getPointeeType(); | |||
4161 | // We work around a defect in the standard here: cv-qualifiers are also | |||
4162 | // removed from P and A in this case, unless P was a reference type. This | |||
4163 | // seems to mostly match what other compilers are doing. | |||
4164 | if (!FromType->getAs<ReferenceType>()) { | |||
4165 | A = A.getUnqualifiedType(); | |||
4166 | P = P.getUnqualifiedType(); | |||
4167 | } | |||
4168 | ||||
4169 | // C++ [temp.deduct.conv]p3: | |||
4170 | // | |||
4171 | // If A is not a reference type: | |||
4172 | } else { | |||
4173 | assert(!A->isReferenceType() && "Reference types were handled above")((!A->isReferenceType() && "Reference types were handled above" ) ? static_cast<void> (0) : __assert_fail ("!A->isReferenceType() && \"Reference types were handled above\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4173, __PRETTY_FUNCTION__)); | |||
4174 | ||||
4175 | // - If P is an array type, the pointer type produced by the | |||
4176 | // array-to-pointer standard conversion (4.2) is used in place | |||
4177 | // of P for type deduction; otherwise, | |||
4178 | if (P->isArrayType()) | |||
4179 | P = Context.getArrayDecayedType(P); | |||
4180 | // - If P is a function type, the pointer type produced by the | |||
4181 | // function-to-pointer standard conversion (4.3) is used in | |||
4182 | // place of P for type deduction; otherwise, | |||
4183 | else if (P->isFunctionType()) | |||
4184 | P = Context.getPointerType(P); | |||
4185 | // - If P is a cv-qualified type, the top level cv-qualifiers of | |||
4186 | // P's type are ignored for type deduction. | |||
4187 | else | |||
4188 | P = P.getUnqualifiedType(); | |||
4189 | ||||
4190 | // C++0x [temp.deduct.conv]p4: | |||
4191 | // If A is a cv-qualified type, the top level cv-qualifiers of A's | |||
4192 | // type are ignored for type deduction. If A is a reference type, the type | |||
4193 | // referred to by A is used for type deduction. | |||
4194 | A = A.getUnqualifiedType(); | |||
4195 | } | |||
4196 | ||||
4197 | // Unevaluated SFINAE context. | |||
4198 | EnterExpressionEvaluationContext Unevaluated( | |||
4199 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | |||
4200 | SFINAETrap Trap(*this); | |||
4201 | ||||
4202 | // C++ [temp.deduct.conv]p1: | |||
4203 | // Template argument deduction is done by comparing the return | |||
4204 | // type of the template conversion function (call it P) with the | |||
4205 | // type that is required as the result of the conversion (call it | |||
4206 | // A) as described in 14.8.2.4. | |||
4207 | TemplateParameterList *TemplateParams | |||
4208 | = ConversionTemplate->getTemplateParameters(); | |||
4209 | SmallVector<DeducedTemplateArgument, 4> Deduced; | |||
4210 | Deduced.resize(TemplateParams->size()); | |||
4211 | ||||
4212 | // C++0x [temp.deduct.conv]p4: | |||
4213 | // In general, the deduction process attempts to find template | |||
4214 | // argument values that will make the deduced A identical to | |||
4215 | // A. However, there are two cases that allow a difference: | |||
4216 | unsigned TDF = 0; | |||
4217 | // - If the original A is a reference type, A can be more | |||
4218 | // cv-qualified than the deduced A (i.e., the type referred to | |||
4219 | // by the reference) | |||
4220 | if (ToType->isReferenceType()) | |||
4221 | TDF |= TDF_ArgWithReferenceType; | |||
4222 | // - The deduced A can be another pointer or pointer to member | |||
4223 | // type that can be converted to A via a qualification | |||
4224 | // conversion. | |||
4225 | // | |||
4226 | // (C++0x [temp.deduct.conv]p6 clarifies that this only happens when | |||
4227 | // both P and A are pointers or member pointers. In this case, we | |||
4228 | // just ignore cv-qualifiers completely). | |||
4229 | if ((P->isPointerType() && A->isPointerType()) || | |||
4230 | (P->isMemberPointerType() && A->isMemberPointerType())) | |||
4231 | TDF |= TDF_IgnoreQualifiers; | |||
4232 | if (TemplateDeductionResult Result | |||
4233 | = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, | |||
4234 | P, A, Info, Deduced, TDF)) | |||
4235 | return Result; | |||
4236 | ||||
4237 | // Create an Instantiation Scope for finalizing the operator. | |||
4238 | LocalInstantiationScope InstScope(*this); | |||
4239 | // Finish template argument deduction. | |||
4240 | FunctionDecl *ConversionSpecialized = nullptr; | |||
4241 | TemplateDeductionResult Result | |||
4242 | = FinishTemplateArgumentDeduction(ConversionTemplate, Deduced, 0, | |||
4243 | ConversionSpecialized, Info); | |||
4244 | Specialization = cast_or_null<CXXConversionDecl>(ConversionSpecialized); | |||
4245 | return Result; | |||
4246 | } | |||
4247 | ||||
4248 | /// Deduce template arguments for a function template when there is | |||
4249 | /// nothing to deduce against (C++0x [temp.arg.explicit]p3). | |||
4250 | /// | |||
4251 | /// \param FunctionTemplate the function template for which we are performing | |||
4252 | /// template argument deduction. | |||
4253 | /// | |||
4254 | /// \param ExplicitTemplateArgs the explicitly-specified template | |||
4255 | /// arguments. | |||
4256 | /// | |||
4257 | /// \param Specialization if template argument deduction was successful, | |||
4258 | /// this will be set to the function template specialization produced by | |||
4259 | /// template argument deduction. | |||
4260 | /// | |||
4261 | /// \param Info the argument will be updated to provide additional information | |||
4262 | /// about template argument deduction. | |||
4263 | /// | |||
4264 | /// \param IsAddressOfFunction If \c true, we are deducing as part of taking | |||
4265 | /// the address of a function template in a context where we do not have a | |||
4266 | /// target type, per [over.over]. If \c false, we are looking up a function | |||
4267 | /// template specialization based on its signature, which only happens when | |||
4268 | /// deducing a function parameter type from an argument that is a template-id | |||
4269 | /// naming a function template specialization. | |||
4270 | /// | |||
4271 | /// \returns the result of template argument deduction. | |||
4272 | Sema::TemplateDeductionResult Sema::DeduceTemplateArguments( | |||
4273 | FunctionTemplateDecl *FunctionTemplate, | |||
4274 | TemplateArgumentListInfo *ExplicitTemplateArgs, | |||
4275 | FunctionDecl *&Specialization, TemplateDeductionInfo &Info, | |||
4276 | bool IsAddressOfFunction) { | |||
4277 | return DeduceTemplateArguments(FunctionTemplate, ExplicitTemplateArgs, | |||
4278 | QualType(), Specialization, Info, | |||
4279 | IsAddressOfFunction); | |||
4280 | } | |||
4281 | ||||
4282 | namespace { | |||
4283 | struct DependentAuto { bool IsPack; }; | |||
4284 | ||||
4285 | /// Substitute the 'auto' specifier or deduced template specialization type | |||
4286 | /// specifier within a type for a given replacement type. | |||
4287 | class SubstituteDeducedTypeTransform : | |||
4288 | public TreeTransform<SubstituteDeducedTypeTransform> { | |||
4289 | QualType Replacement; | |||
4290 | bool ReplacementIsPack; | |||
4291 | bool UseTypeSugar; | |||
4292 | ||||
4293 | public: | |||
4294 | SubstituteDeducedTypeTransform(Sema &SemaRef, DependentAuto DA) | |||
4295 | : TreeTransform<SubstituteDeducedTypeTransform>(SemaRef), Replacement(), | |||
4296 | ReplacementIsPack(DA.IsPack), UseTypeSugar(true) {} | |||
4297 | ||||
4298 | SubstituteDeducedTypeTransform(Sema &SemaRef, QualType Replacement, | |||
4299 | bool UseTypeSugar = true) | |||
4300 | : TreeTransform<SubstituteDeducedTypeTransform>(SemaRef), | |||
4301 | Replacement(Replacement), ReplacementIsPack(false), | |||
4302 | UseTypeSugar(UseTypeSugar) {} | |||
4303 | ||||
4304 | QualType TransformDesugared(TypeLocBuilder &TLB, DeducedTypeLoc TL) { | |||
4305 | assert(isa<TemplateTypeParmType>(Replacement) &&((isa<TemplateTypeParmType>(Replacement) && "unexpected unsugared replacement kind" ) ? static_cast<void> (0) : __assert_fail ("isa<TemplateTypeParmType>(Replacement) && \"unexpected unsugared replacement kind\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4306, __PRETTY_FUNCTION__)) | |||
4306 | "unexpected unsugared replacement kind")((isa<TemplateTypeParmType>(Replacement) && "unexpected unsugared replacement kind" ) ? static_cast<void> (0) : __assert_fail ("isa<TemplateTypeParmType>(Replacement) && \"unexpected unsugared replacement kind\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4306, __PRETTY_FUNCTION__)); | |||
4307 | QualType Result = Replacement; | |||
4308 | TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); | |||
4309 | NewTL.setNameLoc(TL.getNameLoc()); | |||
4310 | return Result; | |||
4311 | } | |||
4312 | ||||
4313 | QualType TransformAutoType(TypeLocBuilder &TLB, AutoTypeLoc TL) { | |||
4314 | // If we're building the type pattern to deduce against, don't wrap the | |||
4315 | // substituted type in an AutoType. Certain template deduction rules | |||
4316 | // apply only when a template type parameter appears directly (and not if | |||
4317 | // the parameter is found through desugaring). For instance: | |||
4318 | // auto &&lref = lvalue; | |||
4319 | // must transform into "rvalue reference to T" not "rvalue reference to | |||
4320 | // auto type deduced as T" in order for [temp.deduct.call]p3 to apply. | |||
4321 | // | |||
4322 | // FIXME: Is this still necessary? | |||
4323 | if (!UseTypeSugar) | |||
4324 | return TransformDesugared(TLB, TL); | |||
4325 | ||||
4326 | QualType Result = SemaRef.Context.getAutoType( | |||
4327 | Replacement, TL.getTypePtr()->getKeyword(), Replacement.isNull(), | |||
4328 | ReplacementIsPack); | |||
4329 | auto NewTL = TLB.push<AutoTypeLoc>(Result); | |||
4330 | NewTL.setNameLoc(TL.getNameLoc()); | |||
4331 | return Result; | |||
4332 | } | |||
4333 | ||||
4334 | QualType TransformDeducedTemplateSpecializationType( | |||
4335 | TypeLocBuilder &TLB, DeducedTemplateSpecializationTypeLoc TL) { | |||
4336 | if (!UseTypeSugar) | |||
4337 | return TransformDesugared(TLB, TL); | |||
4338 | ||||
4339 | QualType Result = SemaRef.Context.getDeducedTemplateSpecializationType( | |||
4340 | TL.getTypePtr()->getTemplateName(), | |||
4341 | Replacement, Replacement.isNull()); | |||
4342 | auto NewTL = TLB.push<DeducedTemplateSpecializationTypeLoc>(Result); | |||
4343 | NewTL.setNameLoc(TL.getNameLoc()); | |||
4344 | return Result; | |||
4345 | } | |||
4346 | ||||
4347 | ExprResult TransformLambdaExpr(LambdaExpr *E) { | |||
4348 | // Lambdas never need to be transformed. | |||
4349 | return E; | |||
4350 | } | |||
4351 | ||||
4352 | QualType Apply(TypeLoc TL) { | |||
4353 | // Create some scratch storage for the transformed type locations. | |||
4354 | // FIXME: We're just going to throw this information away. Don't build it. | |||
4355 | TypeLocBuilder TLB; | |||
4356 | TLB.reserve(TL.getFullDataSize()); | |||
4357 | return TransformType(TLB, TL); | |||
4358 | } | |||
4359 | }; | |||
4360 | ||||
4361 | } // namespace | |||
4362 | ||||
4363 | Sema::DeduceAutoResult | |||
4364 | Sema::DeduceAutoType(TypeSourceInfo *Type, Expr *&Init, QualType &Result, | |||
4365 | Optional<unsigned> DependentDeductionDepth) { | |||
4366 | return DeduceAutoType(Type->getTypeLoc(), Init, Result, | |||
4367 | DependentDeductionDepth); | |||
4368 | } | |||
4369 | ||||
4370 | /// Attempt to produce an informative diagostic explaining why auto deduction | |||
4371 | /// failed. | |||
4372 | /// \return \c true if diagnosed, \c false if not. | |||
4373 | static bool diagnoseAutoDeductionFailure(Sema &S, | |||
4374 | Sema::TemplateDeductionResult TDK, | |||
4375 | TemplateDeductionInfo &Info, | |||
4376 | ArrayRef<SourceRange> Ranges) { | |||
4377 | switch (TDK) { | |||
4378 | case Sema::TDK_Inconsistent: { | |||
4379 | // Inconsistent deduction means we were deducing from an initializer list. | |||
4380 | auto D = S.Diag(Info.getLocation(), diag::err_auto_inconsistent_deduction); | |||
4381 | D << Info.FirstArg << Info.SecondArg; | |||
4382 | for (auto R : Ranges) | |||
4383 | D << R; | |||
4384 | return true; | |||
4385 | } | |||
4386 | ||||
4387 | // FIXME: Are there other cases for which a custom diagnostic is more useful | |||
4388 | // than the basic "types don't match" diagnostic? | |||
4389 | ||||
4390 | default: | |||
4391 | return false; | |||
4392 | } | |||
4393 | } | |||
4394 | ||||
4395 | /// Deduce the type for an auto type-specifier (C++11 [dcl.spec.auto]p6) | |||
4396 | /// | |||
4397 | /// Note that this is done even if the initializer is dependent. (This is | |||
4398 | /// necessary to support partial ordering of templates using 'auto'.) | |||
4399 | /// A dependent type will be produced when deducing from a dependent type. | |||
4400 | /// | |||
4401 | /// \param Type the type pattern using the auto type-specifier. | |||
4402 | /// \param Init the initializer for the variable whose type is to be deduced. | |||
4403 | /// \param Result if type deduction was successful, this will be set to the | |||
4404 | /// deduced type. | |||
4405 | /// \param DependentDeductionDepth Set if we should permit deduction in | |||
4406 | /// dependent cases. This is necessary for template partial ordering with | |||
4407 | /// 'auto' template parameters. The value specified is the template | |||
4408 | /// parameter depth at which we should perform 'auto' deduction. | |||
4409 | Sema::DeduceAutoResult | |||
4410 | Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result, | |||
4411 | Optional<unsigned> DependentDeductionDepth) { | |||
4412 | if (Init->getType()->isNonOverloadPlaceholderType()) { | |||
4413 | ExprResult NonPlaceholder = CheckPlaceholderExpr(Init); | |||
4414 | if (NonPlaceholder.isInvalid()) | |||
4415 | return DAR_FailedAlreadyDiagnosed; | |||
4416 | Init = NonPlaceholder.get(); | |||
4417 | } | |||
4418 | ||||
4419 | DependentAuto DependentResult = { | |||
4420 | /*.IsPack = */ (bool)Type.getAs<PackExpansionTypeLoc>()}; | |||
4421 | ||||
4422 | if (!DependentDeductionDepth && | |||
4423 | (Type.getType()->isDependentType() || Init->isTypeDependent())) { | |||
4424 | Result = SubstituteDeducedTypeTransform(*this, DependentResult).Apply(Type); | |||
4425 | assert(!Result.isNull() && "substituting DependentTy can't fail")((!Result.isNull() && "substituting DependentTy can't fail" ) ? static_cast<void> (0) : __assert_fail ("!Result.isNull() && \"substituting DependentTy can't fail\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4425, __PRETTY_FUNCTION__)); | |||
4426 | return DAR_Succeeded; | |||
4427 | } | |||
4428 | ||||
4429 | // Find the depth of template parameter to synthesize. | |||
4430 | unsigned Depth = DependentDeductionDepth.getValueOr(0); | |||
4431 | ||||
4432 | // If this is a 'decltype(auto)' specifier, do the decltype dance. | |||
4433 | // Since 'decltype(auto)' can only occur at the top of the type, we | |||
4434 | // don't need to go digging for it. | |||
4435 | if (const AutoType *AT = Type.getType()->getAs<AutoType>()) { | |||
4436 | if (AT->isDecltypeAuto()) { | |||
4437 | if (isa<InitListExpr>(Init)) { | |||
4438 | Diag(Init->getBeginLoc(), diag::err_decltype_auto_initializer_list); | |||
4439 | return DAR_FailedAlreadyDiagnosed; | |||
4440 | } | |||
4441 | ||||
4442 | ExprResult ER = CheckPlaceholderExpr(Init); | |||
4443 | if (ER.isInvalid()) | |||
4444 | return DAR_FailedAlreadyDiagnosed; | |||
4445 | Init = ER.get(); | |||
4446 | QualType Deduced = BuildDecltypeType(Init, Init->getBeginLoc(), false); | |||
4447 | if (Deduced.isNull()) | |||
4448 | return DAR_FailedAlreadyDiagnosed; | |||
4449 | // FIXME: Support a non-canonical deduced type for 'auto'. | |||
4450 | Deduced = Context.getCanonicalType(Deduced); | |||
4451 | Result = SubstituteDeducedTypeTransform(*this, Deduced).Apply(Type); | |||
4452 | if (Result.isNull()) | |||
4453 | return DAR_FailedAlreadyDiagnosed; | |||
4454 | return DAR_Succeeded; | |||
4455 | } else if (!getLangOpts().CPlusPlus) { | |||
4456 | if (isa<InitListExpr>(Init)) { | |||
4457 | Diag(Init->getBeginLoc(), diag::err_auto_init_list_from_c); | |||
4458 | return DAR_FailedAlreadyDiagnosed; | |||
4459 | } | |||
4460 | } | |||
4461 | } | |||
4462 | ||||
4463 | SourceLocation Loc = Init->getExprLoc(); | |||
4464 | ||||
4465 | LocalInstantiationScope InstScope(*this); | |||
4466 | ||||
4467 | // Build template<class TemplParam> void Func(FuncParam); | |||
4468 | TemplateTypeParmDecl *TemplParam = TemplateTypeParmDecl::Create( | |||
4469 | Context, nullptr, SourceLocation(), Loc, Depth, 0, nullptr, false, false); | |||
4470 | QualType TemplArg = QualType(TemplParam->getTypeForDecl(), 0); | |||
4471 | NamedDecl *TemplParamPtr = TemplParam; | |||
4472 | FixedSizeTemplateParameterListStorage<1, false> TemplateParamsSt( | |||
4473 | Loc, Loc, TemplParamPtr, Loc, nullptr); | |||
4474 | ||||
4475 | QualType FuncParam = | |||
4476 | SubstituteDeducedTypeTransform(*this, TemplArg, /*UseTypeSugar*/false) | |||
4477 | .Apply(Type); | |||
4478 | assert(!FuncParam.isNull() &&((!FuncParam.isNull() && "substituting template parameter for 'auto' failed" ) ? static_cast<void> (0) : __assert_fail ("!FuncParam.isNull() && \"substituting template parameter for 'auto' failed\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4479, __PRETTY_FUNCTION__)) | |||
4479 | "substituting template parameter for 'auto' failed")((!FuncParam.isNull() && "substituting template parameter for 'auto' failed" ) ? static_cast<void> (0) : __assert_fail ("!FuncParam.isNull() && \"substituting template parameter for 'auto' failed\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4479, __PRETTY_FUNCTION__)); | |||
4480 | ||||
4481 | // Deduce type of TemplParam in Func(Init) | |||
4482 | SmallVector<DeducedTemplateArgument, 1> Deduced; | |||
4483 | Deduced.resize(1); | |||
4484 | ||||
4485 | TemplateDeductionInfo Info(Loc, Depth); | |||
4486 | ||||
4487 | // If deduction failed, don't diagnose if the initializer is dependent; it | |||
4488 | // might acquire a matching type in the instantiation. | |||
4489 | auto DeductionFailed = [&](TemplateDeductionResult TDK, | |||
4490 | ArrayRef<SourceRange> Ranges) -> DeduceAutoResult { | |||
4491 | if (Init->isTypeDependent()) { | |||
4492 | Result = | |||
4493 | SubstituteDeducedTypeTransform(*this, DependentResult).Apply(Type); | |||
4494 | assert(!Result.isNull() && "substituting DependentTy can't fail")((!Result.isNull() && "substituting DependentTy can't fail" ) ? static_cast<void> (0) : __assert_fail ("!Result.isNull() && \"substituting DependentTy can't fail\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4494, __PRETTY_FUNCTION__)); | |||
4495 | return DAR_Succeeded; | |||
4496 | } | |||
4497 | if (diagnoseAutoDeductionFailure(*this, TDK, Info, Ranges)) | |||
4498 | return DAR_FailedAlreadyDiagnosed; | |||
4499 | return DAR_Failed; | |||
4500 | }; | |||
4501 | ||||
4502 | SmallVector<OriginalCallArg, 4> OriginalCallArgs; | |||
4503 | ||||
4504 | InitListExpr *InitList = dyn_cast<InitListExpr>(Init); | |||
4505 | if (InitList) { | |||
4506 | // Notionally, we substitute std::initializer_list<T> for 'auto' and deduce | |||
4507 | // against that. Such deduction only succeeds if removing cv-qualifiers and | |||
4508 | // references results in std::initializer_list<T>. | |||
4509 | if (!Type.getType().getNonReferenceType()->getAs<AutoType>()) | |||
4510 | return DAR_Failed; | |||
4511 | ||||
4512 | SourceRange DeducedFromInitRange; | |||
4513 | for (unsigned i = 0, e = InitList->getNumInits(); i < e; ++i) { | |||
4514 | Expr *Init = InitList->getInit(i); | |||
4515 | ||||
4516 | if (auto TDK = DeduceTemplateArgumentsFromCallArgument( | |||
4517 | *this, TemplateParamsSt.get(), 0, TemplArg, Init, | |||
4518 | Info, Deduced, OriginalCallArgs, /*Decomposed*/ true, | |||
4519 | /*ArgIdx*/ 0, /*TDF*/ 0)) | |||
4520 | return DeductionFailed(TDK, {DeducedFromInitRange, | |||
4521 | Init->getSourceRange()}); | |||
4522 | ||||
4523 | if (DeducedFromInitRange.isInvalid() && | |||
4524 | Deduced[0].getKind() != TemplateArgument::Null) | |||
4525 | DeducedFromInitRange = Init->getSourceRange(); | |||
4526 | } | |||
4527 | } else { | |||
4528 | if (!getLangOpts().CPlusPlus && Init->refersToBitField()) { | |||
4529 | Diag(Loc, diag::err_auto_bitfield); | |||
4530 | return DAR_FailedAlreadyDiagnosed; | |||
4531 | } | |||
4532 | ||||
4533 | if (auto TDK = DeduceTemplateArgumentsFromCallArgument( | |||
4534 | *this, TemplateParamsSt.get(), 0, FuncParam, Init, Info, Deduced, | |||
4535 | OriginalCallArgs, /*Decomposed*/ false, /*ArgIdx*/ 0, /*TDF*/ 0)) | |||
4536 | return DeductionFailed(TDK, {}); | |||
4537 | } | |||
4538 | ||||
4539 | // Could be null if somehow 'auto' appears in a non-deduced context. | |||
4540 | if (Deduced[0].getKind() != TemplateArgument::Type) | |||
4541 | return DeductionFailed(TDK_Incomplete, {}); | |||
4542 | ||||
4543 | QualType DeducedType = Deduced[0].getAsType(); | |||
4544 | ||||
4545 | if (InitList) { | |||
4546 | DeducedType = BuildStdInitializerList(DeducedType, Loc); | |||
4547 | if (DeducedType.isNull()) | |||
4548 | return DAR_FailedAlreadyDiagnosed; | |||
4549 | } | |||
4550 | ||||
4551 | Result = SubstituteDeducedTypeTransform(*this, DeducedType).Apply(Type); | |||
4552 | if (Result.isNull()) | |||
4553 | return DAR_FailedAlreadyDiagnosed; | |||
4554 | ||||
4555 | // Check that the deduced argument type is compatible with the original | |||
4556 | // argument type per C++ [temp.deduct.call]p4. | |||
4557 | QualType DeducedA = InitList ? Deduced[0].getAsType() : Result; | |||
4558 | for (const OriginalCallArg &OriginalArg : OriginalCallArgs) { | |||
4559 | assert((bool)InitList == OriginalArg.DecomposedParam &&(((bool)InitList == OriginalArg.DecomposedParam && "decomposed non-init-list in auto deduction?" ) ? static_cast<void> (0) : __assert_fail ("(bool)InitList == OriginalArg.DecomposedParam && \"decomposed non-init-list in auto deduction?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4560, __PRETTY_FUNCTION__)) | |||
4560 | "decomposed non-init-list in auto deduction?")(((bool)InitList == OriginalArg.DecomposedParam && "decomposed non-init-list in auto deduction?" ) ? static_cast<void> (0) : __assert_fail ("(bool)InitList == OriginalArg.DecomposedParam && \"decomposed non-init-list in auto deduction?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4560, __PRETTY_FUNCTION__)); | |||
4561 | if (auto TDK = | |||
4562 | CheckOriginalCallArgDeduction(*this, Info, OriginalArg, DeducedA)) { | |||
4563 | Result = QualType(); | |||
4564 | return DeductionFailed(TDK, {}); | |||
4565 | } | |||
4566 | } | |||
4567 | ||||
4568 | return DAR_Succeeded; | |||
4569 | } | |||
4570 | ||||
4571 | QualType Sema::SubstAutoType(QualType TypeWithAuto, | |||
4572 | QualType TypeToReplaceAuto) { | |||
4573 | if (TypeToReplaceAuto->isDependentType()) | |||
4574 | return SubstituteDeducedTypeTransform( | |||
4575 | *this, DependentAuto{ | |||
4576 | TypeToReplaceAuto->containsUnexpandedParameterPack()}) | |||
4577 | .TransformType(TypeWithAuto); | |||
4578 | return SubstituteDeducedTypeTransform(*this, TypeToReplaceAuto) | |||
4579 | .TransformType(TypeWithAuto); | |||
4580 | } | |||
4581 | ||||
4582 | TypeSourceInfo *Sema::SubstAutoTypeSourceInfo(TypeSourceInfo *TypeWithAuto, | |||
4583 | QualType TypeToReplaceAuto) { | |||
4584 | if (TypeToReplaceAuto->isDependentType()) | |||
4585 | return SubstituteDeducedTypeTransform( | |||
4586 | *this, | |||
4587 | DependentAuto{ | |||
4588 | TypeToReplaceAuto->containsUnexpandedParameterPack()}) | |||
4589 | .TransformType(TypeWithAuto); | |||
4590 | return SubstituteDeducedTypeTransform(*this, TypeToReplaceAuto) | |||
4591 | .TransformType(TypeWithAuto); | |||
4592 | } | |||
4593 | ||||
4594 | QualType Sema::ReplaceAutoType(QualType TypeWithAuto, | |||
4595 | QualType TypeToReplaceAuto) { | |||
4596 | return SubstituteDeducedTypeTransform(*this, TypeToReplaceAuto, | |||
4597 | /*UseTypeSugar*/ false) | |||
4598 | .TransformType(TypeWithAuto); | |||
4599 | } | |||
4600 | ||||
4601 | void Sema::DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init) { | |||
4602 | if (isa<InitListExpr>(Init)) | |||
4603 | Diag(VDecl->getLocation(), | |||
4604 | VDecl->isInitCapture() | |||
4605 | ? diag::err_init_capture_deduction_failure_from_init_list | |||
4606 | : diag::err_auto_var_deduction_failure_from_init_list) | |||
4607 | << VDecl->getDeclName() << VDecl->getType() << Init->getSourceRange(); | |||
4608 | else | |||
4609 | Diag(VDecl->getLocation(), | |||
4610 | VDecl->isInitCapture() ? diag::err_init_capture_deduction_failure | |||
4611 | : diag::err_auto_var_deduction_failure) | |||
4612 | << VDecl->getDeclName() << VDecl->getType() << Init->getType() | |||
4613 | << Init->getSourceRange(); | |||
4614 | } | |||
4615 | ||||
4616 | bool Sema::DeduceReturnType(FunctionDecl *FD, SourceLocation Loc, | |||
4617 | bool Diagnose) { | |||
4618 | assert(FD->getReturnType()->isUndeducedType())((FD->getReturnType()->isUndeducedType()) ? static_cast <void> (0) : __assert_fail ("FD->getReturnType()->isUndeducedType()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4618, __PRETTY_FUNCTION__)); | |||
4619 | ||||
4620 | // For a lambda's conversion operator, deduce any 'auto' or 'decltype(auto)' | |||
4621 | // within the return type from the call operator's type. | |||
4622 | if (isLambdaConversionOperator(FD)) { | |||
4623 | CXXRecordDecl *Lambda = cast<CXXMethodDecl>(FD)->getParent(); | |||
4624 | FunctionDecl *CallOp = Lambda->getLambdaCallOperator(); | |||
4625 | ||||
4626 | // For a generic lambda, instantiate the call operator if needed. | |||
4627 | if (auto *Args = FD->getTemplateSpecializationArgs()) { | |||
4628 | CallOp = InstantiateFunctionDeclaration( | |||
4629 | CallOp->getDescribedFunctionTemplate(), Args, Loc); | |||
4630 | if (!CallOp || CallOp->isInvalidDecl()) | |||
4631 | return true; | |||
4632 | ||||
4633 | // We might need to deduce the return type by instantiating the definition | |||
4634 | // of the operator() function. | |||
4635 | if (CallOp->getReturnType()->isUndeducedType()) | |||
4636 | InstantiateFunctionDefinition(Loc, CallOp); | |||
4637 | } | |||
4638 | ||||
4639 | if (CallOp->isInvalidDecl()) | |||
4640 | return true; | |||
4641 | assert(!CallOp->getReturnType()->isUndeducedType() &&((!CallOp->getReturnType()->isUndeducedType() && "failed to deduce lambda return type") ? static_cast<void > (0) : __assert_fail ("!CallOp->getReturnType()->isUndeducedType() && \"failed to deduce lambda return type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4642, __PRETTY_FUNCTION__)) | |||
4642 | "failed to deduce lambda return type")((!CallOp->getReturnType()->isUndeducedType() && "failed to deduce lambda return type") ? static_cast<void > (0) : __assert_fail ("!CallOp->getReturnType()->isUndeducedType() && \"failed to deduce lambda return type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4642, __PRETTY_FUNCTION__)); | |||
4643 | ||||
4644 | // Build the new return type from scratch. | |||
4645 | QualType RetType = getLambdaConversionFunctionResultType( | |||
4646 | CallOp->getType()->castAs<FunctionProtoType>()); | |||
4647 | if (FD->getReturnType()->getAs<PointerType>()) | |||
4648 | RetType = Context.getPointerType(RetType); | |||
4649 | else { | |||
4650 | assert(FD->getReturnType()->getAs<BlockPointerType>())((FD->getReturnType()->getAs<BlockPointerType>()) ? static_cast<void> (0) : __assert_fail ("FD->getReturnType()->getAs<BlockPointerType>()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4650, __PRETTY_FUNCTION__)); | |||
4651 | RetType = Context.getBlockPointerType(RetType); | |||
4652 | } | |||
4653 | Context.adjustDeducedFunctionResultType(FD, RetType); | |||
4654 | return false; | |||
4655 | } | |||
4656 | ||||
4657 | if (FD->getTemplateInstantiationPattern()) | |||
4658 | InstantiateFunctionDefinition(Loc, FD); | |||
4659 | ||||
4660 | bool StillUndeduced = FD->getReturnType()->isUndeducedType(); | |||
4661 | if (StillUndeduced && Diagnose && !FD->isInvalidDecl()) { | |||
4662 | Diag(Loc, diag::err_auto_fn_used_before_defined) << FD; | |||
4663 | Diag(FD->getLocation(), diag::note_callee_decl) << FD; | |||
4664 | } | |||
4665 | ||||
4666 | return StillUndeduced; | |||
4667 | } | |||
4668 | ||||
4669 | /// If this is a non-static member function, | |||
4670 | static void | |||
4671 | AddImplicitObjectParameterType(ASTContext &Context, | |||
4672 | CXXMethodDecl *Method, | |||
4673 | SmallVectorImpl<QualType> &ArgTypes) { | |||
4674 | // C++11 [temp.func.order]p3: | |||
4675 | // [...] The new parameter is of type "reference to cv A," where cv are | |||
4676 | // the cv-qualifiers of the function template (if any) and A is | |||
4677 | // the class of which the function template is a member. | |||
4678 | // | |||
4679 | // The standard doesn't say explicitly, but we pick the appropriate kind of | |||
4680 | // reference type based on [over.match.funcs]p4. | |||
4681 | QualType ArgTy = Context.getTypeDeclType(Method->getParent()); | |||
4682 | ArgTy = Context.getQualifiedType(ArgTy, Method->getMethodQualifiers()); | |||
4683 | if (Method->getRefQualifier() == RQ_RValue) | |||
4684 | ArgTy = Context.getRValueReferenceType(ArgTy); | |||
4685 | else | |||
4686 | ArgTy = Context.getLValueReferenceType(ArgTy); | |||
4687 | ArgTypes.push_back(ArgTy); | |||
4688 | } | |||
4689 | ||||
4690 | /// Determine whether the function template \p FT1 is at least as | |||
4691 | /// specialized as \p FT2. | |||
4692 | static bool isAtLeastAsSpecializedAs(Sema &S, | |||
4693 | SourceLocation Loc, | |||
4694 | FunctionTemplateDecl *FT1, | |||
4695 | FunctionTemplateDecl *FT2, | |||
4696 | TemplatePartialOrderingContext TPOC, | |||
4697 | unsigned NumCallArguments1) { | |||
4698 | FunctionDecl *FD1 = FT1->getTemplatedDecl(); | |||
4699 | FunctionDecl *FD2 = FT2->getTemplatedDecl(); | |||
4700 | const FunctionProtoType *Proto1 = FD1->getType()->getAs<FunctionProtoType>(); | |||
4701 | const FunctionProtoType *Proto2 = FD2->getType()->getAs<FunctionProtoType>(); | |||
4702 | ||||
4703 | assert(Proto1 && Proto2 && "Function templates must have prototypes")((Proto1 && Proto2 && "Function templates must have prototypes" ) ? static_cast<void> (0) : __assert_fail ("Proto1 && Proto2 && \"Function templates must have prototypes\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4703, __PRETTY_FUNCTION__)); | |||
4704 | TemplateParameterList *TemplateParams = FT2->getTemplateParameters(); | |||
4705 | SmallVector<DeducedTemplateArgument, 4> Deduced; | |||
4706 | Deduced.resize(TemplateParams->size()); | |||
4707 | ||||
4708 | // C++0x [temp.deduct.partial]p3: | |||
4709 | // The types used to determine the ordering depend on the context in which | |||
4710 | // the partial ordering is done: | |||
4711 | TemplateDeductionInfo Info(Loc); | |||
4712 | SmallVector<QualType, 4> Args2; | |||
4713 | switch (TPOC) { | |||
4714 | case TPOC_Call: { | |||
4715 | // - In the context of a function call, the function parameter types are | |||
4716 | // used. | |||
4717 | CXXMethodDecl *Method1 = dyn_cast<CXXMethodDecl>(FD1); | |||
4718 | CXXMethodDecl *Method2 = dyn_cast<CXXMethodDecl>(FD2); | |||
4719 | ||||
4720 | // C++11 [temp.func.order]p3: | |||
4721 | // [...] If only one of the function templates is a non-static | |||
4722 | // member, that function template is considered to have a new | |||
4723 | // first parameter inserted in its function parameter list. The | |||
4724 | // new parameter is of type "reference to cv A," where cv are | |||
4725 | // the cv-qualifiers of the function template (if any) and A is | |||
4726 | // the class of which the function template is a member. | |||
4727 | // | |||
4728 | // Note that we interpret this to mean "if one of the function | |||
4729 | // templates is a non-static member and the other is a non-member"; | |||
4730 | // otherwise, the ordering rules for static functions against non-static | |||
4731 | // functions don't make any sense. | |||
4732 | // | |||
4733 | // C++98/03 doesn't have this provision but we've extended DR532 to cover | |||
4734 | // it as wording was broken prior to it. | |||
4735 | SmallVector<QualType, 4> Args1; | |||
4736 | ||||
4737 | unsigned NumComparedArguments = NumCallArguments1; | |||
4738 | ||||
4739 | if (!Method2 && Method1 && !Method1->isStatic()) { | |||
4740 | // Compare 'this' from Method1 against first parameter from Method2. | |||
4741 | AddImplicitObjectParameterType(S.Context, Method1, Args1); | |||
4742 | ++NumComparedArguments; | |||
4743 | } else if (!Method1 && Method2 && !Method2->isStatic()) { | |||
4744 | // Compare 'this' from Method2 against first parameter from Method1. | |||
4745 | AddImplicitObjectParameterType(S.Context, Method2, Args2); | |||
4746 | } | |||
4747 | ||||
4748 | Args1.insert(Args1.end(), Proto1->param_type_begin(), | |||
4749 | Proto1->param_type_end()); | |||
4750 | Args2.insert(Args2.end(), Proto2->param_type_begin(), | |||
4751 | Proto2->param_type_end()); | |||
4752 | ||||
4753 | // C++ [temp.func.order]p5: | |||
4754 | // The presence of unused ellipsis and default arguments has no effect on | |||
4755 | // the partial ordering of function templates. | |||
4756 | if (Args1.size() > NumComparedArguments) | |||
4757 | Args1.resize(NumComparedArguments); | |||
4758 | if (Args2.size() > NumComparedArguments) | |||
4759 | Args2.resize(NumComparedArguments); | |||
4760 | if (DeduceTemplateArguments(S, TemplateParams, Args2.data(), Args2.size(), | |||
4761 | Args1.data(), Args1.size(), Info, Deduced, | |||
4762 | TDF_None, /*PartialOrdering=*/true)) | |||
4763 | return false; | |||
4764 | ||||
4765 | break; | |||
4766 | } | |||
4767 | ||||
4768 | case TPOC_Conversion: | |||
4769 | // - In the context of a call to a conversion operator, the return types | |||
4770 | // of the conversion function templates are used. | |||
4771 | if (DeduceTemplateArgumentsByTypeMatch( | |||
4772 | S, TemplateParams, Proto2->getReturnType(), Proto1->getReturnType(), | |||
4773 | Info, Deduced, TDF_None, | |||
4774 | /*PartialOrdering=*/true)) | |||
4775 | return false; | |||
4776 | break; | |||
4777 | ||||
4778 | case TPOC_Other: | |||
4779 | // - In other contexts (14.6.6.2) the function template's function type | |||
4780 | // is used. | |||
4781 | if (DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, | |||
4782 | FD2->getType(), FD1->getType(), | |||
4783 | Info, Deduced, TDF_None, | |||
4784 | /*PartialOrdering=*/true)) | |||
4785 | return false; | |||
4786 | break; | |||
4787 | } | |||
4788 | ||||
4789 | // C++0x [temp.deduct.partial]p11: | |||
4790 | // In most cases, all template parameters must have values in order for | |||
4791 | // deduction to succeed, but for partial ordering purposes a template | |||
4792 | // parameter may remain without a value provided it is not used in the | |||
4793 | // types being used for partial ordering. [ Note: a template parameter used | |||
4794 | // in a non-deduced context is considered used. -end note] | |||
4795 | unsigned ArgIdx = 0, NumArgs = Deduced.size(); | |||
4796 | for (; ArgIdx != NumArgs; ++ArgIdx) | |||
4797 | if (Deduced[ArgIdx].isNull()) | |||
4798 | break; | |||
4799 | ||||
4800 | // FIXME: We fail to implement [temp.deduct.type]p1 along this path. We need | |||
4801 | // to substitute the deduced arguments back into the template and check that | |||
4802 | // we get the right type. | |||
4803 | ||||
4804 | if (ArgIdx == NumArgs) { | |||
4805 | // All template arguments were deduced. FT1 is at least as specialized | |||
4806 | // as FT2. | |||
4807 | return true; | |||
4808 | } | |||
4809 | ||||
4810 | // Figure out which template parameters were used. | |||
4811 | llvm::SmallBitVector UsedParameters(TemplateParams->size()); | |||
4812 | switch (TPOC) { | |||
4813 | case TPOC_Call: | |||
4814 | for (unsigned I = 0, N = Args2.size(); I != N; ++I) | |||
4815 | ::MarkUsedTemplateParameters(S.Context, Args2[I], false, | |||
4816 | TemplateParams->getDepth(), | |||
4817 | UsedParameters); | |||
4818 | break; | |||
4819 | ||||
4820 | case TPOC_Conversion: | |||
4821 | ::MarkUsedTemplateParameters(S.Context, Proto2->getReturnType(), false, | |||
4822 | TemplateParams->getDepth(), UsedParameters); | |||
4823 | break; | |||
4824 | ||||
4825 | case TPOC_Other: | |||
4826 | ::MarkUsedTemplateParameters(S.Context, FD2->getType(), false, | |||
4827 | TemplateParams->getDepth(), | |||
4828 | UsedParameters); | |||
4829 | break; | |||
4830 | } | |||
4831 | ||||
4832 | for (; ArgIdx != NumArgs; ++ArgIdx) | |||
4833 | // If this argument had no value deduced but was used in one of the types | |||
4834 | // used for partial ordering, then deduction fails. | |||
4835 | if (Deduced[ArgIdx].isNull() && UsedParameters[ArgIdx]) | |||
4836 | return false; | |||
4837 | ||||
4838 | return true; | |||
4839 | } | |||
4840 | ||||
4841 | /// Determine whether this a function template whose parameter-type-list | |||
4842 | /// ends with a function parameter pack. | |||
4843 | static bool isVariadicFunctionTemplate(FunctionTemplateDecl *FunTmpl) { | |||
4844 | FunctionDecl *Function = FunTmpl->getTemplatedDecl(); | |||
4845 | unsigned NumParams = Function->getNumParams(); | |||
4846 | if (NumParams == 0) | |||
4847 | return false; | |||
4848 | ||||
4849 | ParmVarDecl *Last = Function->getParamDecl(NumParams - 1); | |||
4850 | if (!Last->isParameterPack()) | |||
4851 | return false; | |||
4852 | ||||
4853 | // Make sure that no previous parameter is a parameter pack. | |||
4854 | while (--NumParams > 0) { | |||
4855 | if (Function->getParamDecl(NumParams - 1)->isParameterPack()) | |||
4856 | return false; | |||
4857 | } | |||
4858 | ||||
4859 | return true; | |||
4860 | } | |||
4861 | ||||
4862 | /// Returns the more specialized function template according | |||
4863 | /// to the rules of function template partial ordering (C++ [temp.func.order]). | |||
4864 | /// | |||
4865 | /// \param FT1 the first function template | |||
4866 | /// | |||
4867 | /// \param FT2 the second function template | |||
4868 | /// | |||
4869 | /// \param TPOC the context in which we are performing partial ordering of | |||
4870 | /// function templates. | |||
4871 | /// | |||
4872 | /// \param NumCallArguments1 The number of arguments in the call to FT1, used | |||
4873 | /// only when \c TPOC is \c TPOC_Call. | |||
4874 | /// | |||
4875 | /// \param NumCallArguments2 The number of arguments in the call to FT2, used | |||
4876 | /// only when \c TPOC is \c TPOC_Call. | |||
4877 | /// | |||
4878 | /// \returns the more specialized function template. If neither | |||
4879 | /// template is more specialized, returns NULL. | |||
4880 | FunctionTemplateDecl * | |||
4881 | Sema::getMoreSpecializedTemplate(FunctionTemplateDecl *FT1, | |||
4882 | FunctionTemplateDecl *FT2, | |||
4883 | SourceLocation Loc, | |||
4884 | TemplatePartialOrderingContext TPOC, | |||
4885 | unsigned NumCallArguments1, | |||
4886 | unsigned NumCallArguments2) { | |||
4887 | bool Better1 = isAtLeastAsSpecializedAs(*this, Loc, FT1, FT2, TPOC, | |||
4888 | NumCallArguments1); | |||
4889 | bool Better2 = isAtLeastAsSpecializedAs(*this, Loc, FT2, FT1, TPOC, | |||
4890 | NumCallArguments2); | |||
4891 | ||||
4892 | if (Better1 != Better2) // We have a clear winner | |||
4893 | return Better1 ? FT1 : FT2; | |||
4894 | ||||
4895 | if (!Better1 && !Better2) // Neither is better than the other | |||
4896 | return nullptr; | |||
4897 | ||||
4898 | // FIXME: This mimics what GCC implements, but doesn't match up with the | |||
4899 | // proposed resolution for core issue 692. This area needs to be sorted out, | |||
4900 | // but for now we attempt to maintain compatibility. | |||
4901 | bool Variadic1 = isVariadicFunctionTemplate(FT1); | |||
4902 | bool Variadic2 = isVariadicFunctionTemplate(FT2); | |||
4903 | if (Variadic1 != Variadic2) | |||
4904 | return Variadic1? FT2 : FT1; | |||
4905 | ||||
4906 | return nullptr; | |||
4907 | } | |||
4908 | ||||
4909 | /// Determine if the two templates are equivalent. | |||
4910 | static bool isSameTemplate(TemplateDecl *T1, TemplateDecl *T2) { | |||
4911 | if (T1 == T2) | |||
4912 | return true; | |||
4913 | ||||
4914 | if (!T1 || !T2) | |||
4915 | return false; | |||
4916 | ||||
4917 | return T1->getCanonicalDecl() == T2->getCanonicalDecl(); | |||
4918 | } | |||
4919 | ||||
4920 | /// Retrieve the most specialized of the given function template | |||
4921 | /// specializations. | |||
4922 | /// | |||
4923 | /// \param SpecBegin the start iterator of the function template | |||
4924 | /// specializations that we will be comparing. | |||
4925 | /// | |||
4926 | /// \param SpecEnd the end iterator of the function template | |||
4927 | /// specializations, paired with \p SpecBegin. | |||
4928 | /// | |||
4929 | /// \param Loc the location where the ambiguity or no-specializations | |||
4930 | /// diagnostic should occur. | |||
4931 | /// | |||
4932 | /// \param NoneDiag partial diagnostic used to diagnose cases where there are | |||
4933 | /// no matching candidates. | |||
4934 | /// | |||
4935 | /// \param AmbigDiag partial diagnostic used to diagnose an ambiguity, if one | |||
4936 | /// occurs. | |||
4937 | /// | |||
4938 | /// \param CandidateDiag partial diagnostic used for each function template | |||
4939 | /// specialization that is a candidate in the ambiguous ordering. One parameter | |||
4940 | /// in this diagnostic should be unbound, which will correspond to the string | |||
4941 | /// describing the template arguments for the function template specialization. | |||
4942 | /// | |||
4943 | /// \returns the most specialized function template specialization, if | |||
4944 | /// found. Otherwise, returns SpecEnd. | |||
4945 | UnresolvedSetIterator Sema::getMostSpecialized( | |||
4946 | UnresolvedSetIterator SpecBegin, UnresolvedSetIterator SpecEnd, | |||
4947 | TemplateSpecCandidateSet &FailedCandidates, | |||
4948 | SourceLocation Loc, const PartialDiagnostic &NoneDiag, | |||
4949 | const PartialDiagnostic &AmbigDiag, const PartialDiagnostic &CandidateDiag, | |||
4950 | bool Complain, QualType TargetType) { | |||
4951 | if (SpecBegin == SpecEnd) { | |||
4952 | if (Complain) { | |||
4953 | Diag(Loc, NoneDiag); | |||
4954 | FailedCandidates.NoteCandidates(*this, Loc); | |||
4955 | } | |||
4956 | return SpecEnd; | |||
4957 | } | |||
4958 | ||||
4959 | if (SpecBegin + 1 == SpecEnd) | |||
4960 | return SpecBegin; | |||
4961 | ||||
4962 | // Find the function template that is better than all of the templates it | |||
4963 | // has been compared to. | |||
4964 | UnresolvedSetIterator Best = SpecBegin; | |||
4965 | FunctionTemplateDecl *BestTemplate | |||
4966 | = cast<FunctionDecl>(*Best)->getPrimaryTemplate(); | |||
4967 | assert(BestTemplate && "Not a function template specialization?")((BestTemplate && "Not a function template specialization?" ) ? static_cast<void> (0) : __assert_fail ("BestTemplate && \"Not a function template specialization?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4967, __PRETTY_FUNCTION__)); | |||
4968 | for (UnresolvedSetIterator I = SpecBegin + 1; I != SpecEnd; ++I) { | |||
4969 | FunctionTemplateDecl *Challenger | |||
4970 | = cast<FunctionDecl>(*I)->getPrimaryTemplate(); | |||
4971 | assert(Challenger && "Not a function template specialization?")((Challenger && "Not a function template specialization?" ) ? static_cast<void> (0) : __assert_fail ("Challenger && \"Not a function template specialization?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 4971, __PRETTY_FUNCTION__)); | |||
4972 | if (isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, | |||
4973 | Loc, TPOC_Other, 0, 0), | |||
4974 | Challenger)) { | |||
4975 | Best = I; | |||
4976 | BestTemplate = Challenger; | |||
4977 | } | |||
4978 | } | |||
4979 | ||||
4980 | // Make sure that the "best" function template is more specialized than all | |||
4981 | // of the others. | |||
4982 | bool Ambiguous = false; | |||
4983 | for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { | |||
4984 | FunctionTemplateDecl *Challenger | |||
4985 | = cast<FunctionDecl>(*I)->getPrimaryTemplate(); | |||
4986 | if (I != Best && | |||
4987 | !isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, | |||
4988 | Loc, TPOC_Other, 0, 0), | |||
4989 | BestTemplate)) { | |||
4990 | Ambiguous = true; | |||
4991 | break; | |||
4992 | } | |||
4993 | } | |||
4994 | ||||
4995 | if (!Ambiguous) { | |||
4996 | // We found an answer. Return it. | |||
4997 | return Best; | |||
4998 | } | |||
4999 | ||||
5000 | // Diagnose the ambiguity. | |||
5001 | if (Complain) { | |||
5002 | Diag(Loc, AmbigDiag); | |||
5003 | ||||
5004 | // FIXME: Can we order the candidates in some sane way? | |||
5005 | for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { | |||
5006 | PartialDiagnostic PD = CandidateDiag; | |||
5007 | const auto *FD = cast<FunctionDecl>(*I); | |||
5008 | PD << FD << getTemplateArgumentBindingsText( | |||
5009 | FD->getPrimaryTemplate()->getTemplateParameters(), | |||
5010 | *FD->getTemplateSpecializationArgs()); | |||
5011 | if (!TargetType.isNull()) | |||
5012 | HandleFunctionTypeMismatch(PD, FD->getType(), TargetType); | |||
5013 | Diag((*I)->getLocation(), PD); | |||
5014 | } | |||
5015 | } | |||
5016 | ||||
5017 | return SpecEnd; | |||
5018 | } | |||
5019 | ||||
5020 | /// Determine whether one partial specialization, P1, is at least as | |||
5021 | /// specialized than another, P2. | |||
5022 | /// | |||
5023 | /// \tparam TemplateLikeDecl The kind of P2, which must be a | |||
5024 | /// TemplateDecl or {Class,Var}TemplatePartialSpecializationDecl. | |||
5025 | /// \param T1 The injected-class-name of P1 (faked for a variable template). | |||
5026 | /// \param T2 The injected-class-name of P2 (faked for a variable template). | |||
5027 | template<typename TemplateLikeDecl> | |||
5028 | static bool isAtLeastAsSpecializedAs(Sema &S, QualType T1, QualType T2, | |||
5029 | TemplateLikeDecl *P2, | |||
5030 | TemplateDeductionInfo &Info) { | |||
5031 | // C++ [temp.class.order]p1: | |||
5032 | // For two class template partial specializations, the first is at least as | |||
5033 | // specialized as the second if, given the following rewrite to two | |||
5034 | // function templates, the first function template is at least as | |||
5035 | // specialized as the second according to the ordering rules for function | |||
5036 | // templates (14.6.6.2): | |||
5037 | // - the first function template has the same template parameters as the | |||
5038 | // first partial specialization and has a single function parameter | |||
5039 | // whose type is a class template specialization with the template | |||
5040 | // arguments of the first partial specialization, and | |||
5041 | // - the second function template has the same template parameters as the | |||
5042 | // second partial specialization and has a single function parameter | |||
5043 | // whose type is a class template specialization with the template | |||
5044 | // arguments of the second partial specialization. | |||
5045 | // | |||
5046 | // Rather than synthesize function templates, we merely perform the | |||
5047 | // equivalent partial ordering by performing deduction directly on | |||
5048 | // the template arguments of the class template partial | |||
5049 | // specializations. This computation is slightly simpler than the | |||
5050 | // general problem of function template partial ordering, because | |||
5051 | // class template partial specializations are more constrained. We | |||
5052 | // know that every template parameter is deducible from the class | |||
5053 | // template partial specialization's template arguments, for | |||
5054 | // example. | |||
5055 | SmallVector<DeducedTemplateArgument, 4> Deduced; | |||
5056 | ||||
5057 | // Determine whether P1 is at least as specialized as P2. | |||
5058 | Deduced.resize(P2->getTemplateParameters()->size()); | |||
5059 | if (DeduceTemplateArgumentsByTypeMatch(S, P2->getTemplateParameters(), | |||
5060 | T2, T1, Info, Deduced, TDF_None, | |||
5061 | /*PartialOrdering=*/true)) | |||
5062 | return false; | |||
5063 | ||||
5064 | SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(), | |||
5065 | Deduced.end()); | |||
5066 | Sema::InstantiatingTemplate Inst(S, Info.getLocation(), P2, DeducedArgs, | |||
5067 | Info); | |||
5068 | auto *TST1 = T1->castAs<TemplateSpecializationType>(); | |||
5069 | if (FinishTemplateArgumentDeduction( | |||
5070 | S, P2, /*PartialOrdering=*/true, | |||
5071 | TemplateArgumentList(TemplateArgumentList::OnStack, | |||
5072 | TST1->template_arguments()), | |||
5073 | Deduced, Info)) | |||
5074 | return false; | |||
5075 | ||||
5076 | return true; | |||
5077 | } | |||
5078 | ||||
5079 | /// Returns the more specialized class template partial specialization | |||
5080 | /// according to the rules of partial ordering of class template partial | |||
5081 | /// specializations (C++ [temp.class.order]). | |||
5082 | /// | |||
5083 | /// \param PS1 the first class template partial specialization | |||
5084 | /// | |||
5085 | /// \param PS2 the second class template partial specialization | |||
5086 | /// | |||
5087 | /// \returns the more specialized class template partial specialization. If | |||
5088 | /// neither partial specialization is more specialized, returns NULL. | |||
5089 | ClassTemplatePartialSpecializationDecl * | |||
5090 | Sema::getMoreSpecializedPartialSpecialization( | |||
5091 | ClassTemplatePartialSpecializationDecl *PS1, | |||
5092 | ClassTemplatePartialSpecializationDecl *PS2, | |||
5093 | SourceLocation Loc) { | |||
5094 | QualType PT1 = PS1->getInjectedSpecializationType(); | |||
5095 | QualType PT2 = PS2->getInjectedSpecializationType(); | |||
5096 | ||||
5097 | TemplateDeductionInfo Info(Loc); | |||
5098 | bool Better1 = isAtLeastAsSpecializedAs(*this, PT1, PT2, PS2, Info); | |||
5099 | bool Better2 = isAtLeastAsSpecializedAs(*this, PT2, PT1, PS1, Info); | |||
5100 | ||||
5101 | if (Better1 == Better2) | |||
5102 | return nullptr; | |||
5103 | ||||
5104 | return Better1 ? PS1 : PS2; | |||
5105 | } | |||
5106 | ||||
5107 | bool Sema::isMoreSpecializedThanPrimary( | |||
5108 | ClassTemplatePartialSpecializationDecl *Spec, TemplateDeductionInfo &Info) { | |||
5109 | ClassTemplateDecl *Primary = Spec->getSpecializedTemplate(); | |||
5110 | QualType PrimaryT = Primary->getInjectedClassNameSpecialization(); | |||
5111 | QualType PartialT = Spec->getInjectedSpecializationType(); | |||
5112 | if (!isAtLeastAsSpecializedAs(*this, PartialT, PrimaryT, Primary, Info)) | |||
5113 | return false; | |||
5114 | if (isAtLeastAsSpecializedAs(*this, PrimaryT, PartialT, Spec, Info)) { | |||
5115 | Info.clearSFINAEDiagnostic(); | |||
5116 | return false; | |||
5117 | } | |||
5118 | return true; | |||
5119 | } | |||
5120 | ||||
5121 | VarTemplatePartialSpecializationDecl * | |||
5122 | Sema::getMoreSpecializedPartialSpecialization( | |||
5123 | VarTemplatePartialSpecializationDecl *PS1, | |||
5124 | VarTemplatePartialSpecializationDecl *PS2, SourceLocation Loc) { | |||
5125 | // Pretend the variable template specializations are class template | |||
5126 | // specializations and form a fake injected class name type for comparison. | |||
5127 | assert(PS1->getSpecializedTemplate() == PS2->getSpecializedTemplate() &&((PS1->getSpecializedTemplate() == PS2->getSpecializedTemplate () && "the partial specializations being compared should specialize" " the same template.") ? static_cast<void> (0) : __assert_fail ("PS1->getSpecializedTemplate() == PS2->getSpecializedTemplate() && \"the partial specializations being compared should specialize\" \" the same template.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 5129, __PRETTY_FUNCTION__)) | |||
5128 | "the partial specializations being compared should specialize"((PS1->getSpecializedTemplate() == PS2->getSpecializedTemplate () && "the partial specializations being compared should specialize" " the same template.") ? static_cast<void> (0) : __assert_fail ("PS1->getSpecializedTemplate() == PS2->getSpecializedTemplate() && \"the partial specializations being compared should specialize\" \" the same template.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 5129, __PRETTY_FUNCTION__)) | |||
5129 | " the same template.")((PS1->getSpecializedTemplate() == PS2->getSpecializedTemplate () && "the partial specializations being compared should specialize" " the same template.") ? static_cast<void> (0) : __assert_fail ("PS1->getSpecializedTemplate() == PS2->getSpecializedTemplate() && \"the partial specializations being compared should specialize\" \" the same template.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 5129, __PRETTY_FUNCTION__)); | |||
5130 | TemplateName Name(PS1->getSpecializedTemplate()); | |||
5131 | TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); | |||
5132 | QualType PT1 = Context.getTemplateSpecializationType( | |||
5133 | CanonTemplate, PS1->getTemplateArgs().asArray()); | |||
5134 | QualType PT2 = Context.getTemplateSpecializationType( | |||
5135 | CanonTemplate, PS2->getTemplateArgs().asArray()); | |||
5136 | ||||
5137 | TemplateDeductionInfo Info(Loc); | |||
5138 | bool Better1 = isAtLeastAsSpecializedAs(*this, PT1, PT2, PS2, Info); | |||
5139 | bool Better2 = isAtLeastAsSpecializedAs(*this, PT2, PT1, PS1, Info); | |||
5140 | ||||
5141 | if (Better1 == Better2) | |||
5142 | return nullptr; | |||
5143 | ||||
5144 | return Better1 ? PS1 : PS2; | |||
5145 | } | |||
5146 | ||||
5147 | bool Sema::isMoreSpecializedThanPrimary( | |||
5148 | VarTemplatePartialSpecializationDecl *Spec, TemplateDeductionInfo &Info) { | |||
5149 | TemplateDecl *Primary = Spec->getSpecializedTemplate(); | |||
5150 | // FIXME: Cache the injected template arguments rather than recomputing | |||
5151 | // them for each partial specialization. | |||
5152 | SmallVector<TemplateArgument, 8> PrimaryArgs; | |||
5153 | Context.getInjectedTemplateArgs(Primary->getTemplateParameters(), | |||
5154 | PrimaryArgs); | |||
5155 | ||||
5156 | TemplateName CanonTemplate = | |||
5157 | Context.getCanonicalTemplateName(TemplateName(Primary)); | |||
5158 | QualType PrimaryT = Context.getTemplateSpecializationType( | |||
5159 | CanonTemplate, PrimaryArgs); | |||
5160 | QualType PartialT = Context.getTemplateSpecializationType( | |||
5161 | CanonTemplate, Spec->getTemplateArgs().asArray()); | |||
5162 | if (!isAtLeastAsSpecializedAs(*this, PartialT, PrimaryT, Primary, Info)) | |||
5163 | return false; | |||
5164 | if (isAtLeastAsSpecializedAs(*this, PrimaryT, PartialT, Spec, Info)) { | |||
5165 | Info.clearSFINAEDiagnostic(); | |||
5166 | return false; | |||
5167 | } | |||
5168 | return true; | |||
5169 | } | |||
5170 | ||||
5171 | bool Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs( | |||
5172 | TemplateParameterList *P, TemplateDecl *AArg, SourceLocation Loc) { | |||
5173 | // C++1z [temp.arg.template]p4: (DR 150) | |||
5174 | // A template template-parameter P is at least as specialized as a | |||
5175 | // template template-argument A if, given the following rewrite to two | |||
5176 | // function templates... | |||
5177 | ||||
5178 | // Rather than synthesize function templates, we merely perform the | |||
5179 | // equivalent partial ordering by performing deduction directly on | |||
5180 | // the template parameter lists of the template template parameters. | |||
5181 | // | |||
5182 | // Given an invented class template X with the template parameter list of | |||
5183 | // A (including default arguments): | |||
5184 | TemplateName X = Context.getCanonicalTemplateName(TemplateName(AArg)); | |||
5185 | TemplateParameterList *A = AArg->getTemplateParameters(); | |||
5186 | ||||
5187 | // - Each function template has a single function parameter whose type is | |||
5188 | // a specialization of X with template arguments corresponding to the | |||
5189 | // template parameters from the respective function template | |||
5190 | SmallVector<TemplateArgument, 8> AArgs; | |||
5191 | Context.getInjectedTemplateArgs(A, AArgs); | |||
5192 | ||||
5193 | // Check P's arguments against A's parameter list. This will fill in default | |||
5194 | // template arguments as needed. AArgs are already correct by construction. | |||
5195 | // We can't just use CheckTemplateIdType because that will expand alias | |||
5196 | // templates. | |||
5197 | SmallVector<TemplateArgument, 4> PArgs; | |||
5198 | { | |||
5199 | SFINAETrap Trap(*this); | |||
5200 | ||||
5201 | Context.getInjectedTemplateArgs(P, PArgs); | |||
5202 | TemplateArgumentListInfo PArgList(P->getLAngleLoc(), P->getRAngleLoc()); | |||
5203 | for (unsigned I = 0, N = P->size(); I != N; ++I) { | |||
5204 | // Unwrap packs that getInjectedTemplateArgs wrapped around pack | |||
5205 | // expansions, to form an "as written" argument list. | |||
5206 | TemplateArgument Arg = PArgs[I]; | |||
5207 | if (Arg.getKind() == TemplateArgument::Pack) { | |||
5208 | assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion())((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion ()) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplateDeduction.cpp" , 5208, __PRETTY_FUNCTION__)); | |||
5209 | Arg = *Arg.pack_begin(); | |||
5210 | } | |||
5211 | PArgList.addArgument(getTrivialTemplateArgumentLoc( | |||
5212 | Arg, QualType(), P->getParam(I)->getLocation())); | |||
5213 | } | |||
5214 | PArgs.clear(); | |||
5215 | ||||
5216 | // C++1z [temp.arg.template]p3: | |||
5217 | // If the rewrite produces an invalid type, then P is not at least as | |||
5218 | // specialized as A. | |||
5219 | if (CheckTemplateArgumentList(AArg, Loc, PArgList, false, PArgs) || | |||
5220 | Trap.hasErrorOccurred()) | |||
5221 | return false; | |||
5222 | } | |||
5223 | ||||
5224 | QualType AType = Context.getTemplateSpecializationType(X, AArgs); | |||
5225 | QualType PType = Context.getTemplateSpecializationType(X, PArgs); | |||
5226 | ||||
5227 | // ... the function template corresponding to P is at least as specialized | |||
5228 | // as the function template corresponding to A according to the partial | |||
5229 | // ordering rules for function templates. | |||
5230 | TemplateDeductionInfo Info(Loc, A->getDepth()); | |||
5231 | return isAtLeastAsSpecializedAs(*this, PType, AType, AArg, Info); | |||
5232 | } | |||
5233 | ||||
5234 | /// Mark the template parameters that are used by the given | |||
5235 | /// expression. | |||
5236 | static void | |||
5237 | MarkUsedTemplateParameters(ASTContext &Ctx, | |||
5238 | const Expr *E, | |||
5239 | bool OnlyDeduced, | |||
5240 | unsigned Depth, | |||
5241 | llvm::SmallBitVector &Used) { | |||
5242 | // We can deduce from a pack expansion. | |||
5243 | if (const PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(E)) | |||
5244 | E = Expansion->getPattern(); | |||
5245 | ||||
5246 | // Skip through any implicit casts we added while type-checking, and any | |||
5247 | // substitutions performed by template alias expansion. | |||
5248 | while (true) { | |||
5249 | if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) | |||
5250 | E = ICE->getSubExpr(); | |||
5251 | else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(E)) | |||
5252 | E = CE->getSubExpr(); | |||
5253 | else if (const SubstNonTypeTemplateParmExpr *Subst = | |||
5254 | dyn_cast<SubstNonTypeTemplateParmExpr>(E)) | |||
5255 | E = Subst->getReplacement(); | |||
5256 | else | |||
5257 | break; | |||
5258 | } | |||
5259 | ||||
5260 | // FIXME: if !OnlyDeduced, we have to walk the whole subexpression to | |||
5261 | // find other occurrences of template parameters. | |||
5262 | const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E); | |||
5263 | if (!DRE) | |||
5264 | return; | |||
5265 | ||||
5266 | const NonTypeTemplateParmDecl *NTTP | |||
5267 | = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); | |||
5268 | if (!NTTP) | |||
5269 | return; | |||
5270 | ||||
5271 | if (NTTP->getDepth() == Depth) | |||
5272 | Used[NTTP->getIndex()] = true; | |||
5273 | ||||
5274 | // In C++17 mode, additional arguments may be deduced from the type of a | |||
5275 | // non-type argument. | |||
5276 | if (Ctx.getLangOpts().CPlusPlus17) | |||
5277 | MarkUsedTemplateParameters(Ctx, NTTP->getType(), OnlyDeduced, Depth, Used); | |||
5278 | } | |||
5279 | ||||
5280 | /// Mark the template parameters that are used by the given | |||
5281 | /// nested name specifier. | |||
5282 | static void | |||
5283 | MarkUsedTemplateParameters(ASTContext &Ctx, | |||
5284 | NestedNameSpecifier *NNS, | |||
5285 | bool OnlyDeduced, | |||
5286 | unsigned Depth, | |||
5287 | llvm::SmallBitVector &Used) { | |||
5288 | if (!NNS) | |||
5289 | return; | |||
5290 | ||||
5291 | MarkUsedTemplateParameters(Ctx, NNS->getPrefix(), OnlyDeduced, Depth, | |||
5292 | Used); | |||
5293 | MarkUsedTemplateParameters(Ctx, QualType(NNS->getAsType(), 0), | |||
5294 | OnlyDeduced, Depth, Used); | |||
5295 | } | |||
5296 | ||||
5297 | /// Mark the template parameters that are used by the given | |||
5298 | /// template name. | |||
5299 | static void | |||
5300 | MarkUsedTemplateParameters(ASTContext &Ctx, | |||
5301 | TemplateName Name, | |||
5302 | bool OnlyDeduced, | |||
5303 | unsigned Depth, | |||
5304 | llvm::SmallBitVector &Used) { | |||
5305 | if (TemplateDecl *Template = Name.getAsTemplateDecl()) { | |||
5306 | if (TemplateTemplateParmDecl *TTP | |||
5307 | = dyn_cast<TemplateTemplateParmDecl>(Template)) { | |||
5308 | if (TTP->getDepth() == Depth) | |||
5309 | Used[TTP->getIndex()] = true; | |||
5310 | } | |||
5311 | return; | |||
5312 | } | |||
5313 | ||||
5314 | if (QualifiedTemplateName *QTN = Name.getAsQualifiedTemplateName()) | |||
5315 | MarkUsedTemplateParameters(Ctx, QTN->getQualifier(), OnlyDeduced, | |||
5316 | Depth, Used); | |||
5317 | if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) | |||
5318 | MarkUsedTemplateParameters(Ctx, DTN->getQualifier(), OnlyDeduced, | |||
5319 | Depth, Used); | |||
5320 | } | |||
5321 | ||||
5322 | /// Mark the template parameters that are used by the given | |||
5323 | /// type. | |||
5324 | static void | |||
5325 | MarkUsedTemplateParameters(ASTContext &Ctx, QualType T, | |||
5326 | bool OnlyDeduced, | |||
5327 | unsigned Depth, | |||
5328 | llvm::SmallBitVector &Used) { | |||
5329 | if (T.isNull()) | |||
5330 | return; | |||
5331 | ||||
5332 | // Non-dependent types have nothing deducible | |||
5333 | if (!T->isDependentType()) | |||
5334 | return; | |||
5335 | ||||
5336 | T = Ctx.getCanonicalType(T); | |||
5337 | switch (T->getTypeClass()) { | |||
5338 | case Type::Pointer: | |||
5339 | MarkUsedTemplateParameters(Ctx, | |||
5340 | cast<PointerType>(T)->getPointeeType(), | |||
5341 | OnlyDeduced, | |||
5342 | Depth, | |||
5343 | Used); | |||
5344 | break; | |||
5345 | ||||
5346 | case Type::BlockPointer: | |||
5347 | MarkUsedTemplateParameters(Ctx, | |||
5348 | cast<BlockPointerType>(T)->getPointeeType(), | |||
5349 | OnlyDeduced, | |||
5350 | Depth, | |||
5351 | Used); | |||
5352 | break; | |||
5353 | ||||
5354 | case Type::LValueReference: | |||
5355 | case Type::RValueReference: | |||
5356 | MarkUsedTemplateParameters(Ctx, | |||
5357 | cast<ReferenceType>(T)->getPointeeType(), | |||
5358 | OnlyDeduced, | |||
5359 | Depth, | |||
5360 | Used); | |||
5361 | break; | |||
5362 | ||||
5363 | case Type::MemberPointer: { | |||
5364 | const MemberPointerType *MemPtr = cast<MemberPointerType>(T.getTypePtr()); | |||
5365 | MarkUsedTemplateParameters(Ctx, MemPtr->getPointeeType(), OnlyDeduced, | |||
5366 | Depth, Used); | |||
5367 | MarkUsedTemplateParameters(Ctx, QualType(MemPtr->getClass(), 0), | |||
5368 | OnlyDeduced, Depth, Used); | |||
5369 | break; | |||
5370 | } | |||
5371 | ||||
5372 | case Type::DependentSizedArray: | |||
5373 | MarkUsedTemplateParameters(Ctx, | |||
5374 | cast<DependentSizedArrayType>(T)->getSizeExpr(), | |||
5375 | OnlyDeduced, Depth, Used); | |||
5376 | // Fall through to check the element type | |||
5377 | LLVM_FALLTHROUGH[[clang::fallthrough]]; | |||
5378 | ||||
5379 | case Type::ConstantArray: | |||
5380 | case Type::IncompleteArray: | |||
5381 | MarkUsedTemplateParameters(Ctx, | |||
5382 | cast<ArrayType>(T)->getElementType(), | |||
5383 | OnlyDeduced, Depth, Used); | |||
5384 | break; | |||
5385 | ||||
5386 | case Type::Vector: | |||
5387 | case Type::ExtVector: | |||
5388 | MarkUsedTemplateParameters(Ctx, | |||
5389 | cast<VectorType>(T)->getElementType(), | |||
5390 | OnlyDeduced, Depth, Used); | |||
5391 | break; | |||
5392 | ||||
5393 | case Type::DependentVector: { | |||
5394 | const auto *VecType = cast<DependentVectorType>(T); | |||
5395 | MarkUsedTemplateParameters(Ctx, VecType->getElementType(), OnlyDeduced, | |||
5396 | Depth, Used); | |||
5397 | MarkUsedTemplateParameters(Ctx, VecType->getSizeExpr(), OnlyDeduced, Depth, | |||
5398 | Used); | |||
5399 | break; | |||
5400 | } | |||
5401 | case Type::DependentSizedExtVector: { | |||
5402 | const DependentSizedExtVectorType *VecType | |||
5403 | = cast<DependentSizedExtVectorType>(T); | |||
5404 | MarkUsedTemplateParameters(Ctx, VecType->getElementType(), OnlyDeduced, | |||
5405 | Depth, Used); | |||
5406 | MarkUsedTemplateParameters(Ctx, VecType->getSizeExpr(), OnlyDeduced, | |||
5407 | Depth, Used); | |||
5408 | break; | |||
5409 | } | |||
5410 | ||||
5411 | case Type::DependentAddressSpace: { | |||
5412 | const DependentAddressSpaceType *DependentASType = | |||
5413 | cast<DependentAddressSpaceType>(T); | |||
5414 | MarkUsedTemplateParameters(Ctx, DependentASType->getPointeeType(), | |||
5415 | OnlyDeduced, Depth, Used); | |||
5416 | MarkUsedTemplateParameters(Ctx, | |||
5417 | DependentASType->getAddrSpaceExpr(), | |||
5418 | OnlyDeduced, Depth, Used); | |||
5419 | break; | |||
5420 | } | |||
5421 | ||||
5422 | case Type::FunctionProto: { | |||
5423 | const FunctionProtoType *Proto = cast<FunctionProtoType>(T); | |||
5424 | MarkUsedTemplateParameters(Ctx, Proto->getReturnType(), OnlyDeduced, Depth, | |||
5425 | Used); | |||
5426 | for (unsigned I = 0, N = Proto->getNumParams(); I != N; ++I) { | |||
5427 | // C++17 [temp.deduct.type]p5: | |||
5428 | // The non-deduced contexts are: [...] | |||
5429 | // -- A function parameter pack that does not occur at the end of the | |||
5430 | // parameter-declaration-list. | |||
5431 | if (!OnlyDeduced || I + 1 == N || | |||
5432 | !Proto->getParamType(I)->getAs<PackExpansionType>()) { | |||
5433 | MarkUsedTemplateParameters(Ctx, Proto->getParamType(I), OnlyDeduced, | |||
5434 | Depth, Used); | |||
5435 | } else { | |||
5436 | // FIXME: C++17 [temp.deduct.call]p1: | |||
5437 | // When a function parameter pack appears in a non-deduced context, | |||
5438 | // the type of that pack is never deduced. | |||
5439 | // | |||
5440 | // We should also track a set of "never deduced" parameters, and | |||
5441 | // subtract that from the list of deduced parameters after marking. | |||
5442 | } | |||
5443 | } | |||
5444 | if (auto *E = Proto->getNoexceptExpr()) | |||
5445 | MarkUsedTemplateParameters(Ctx, E, OnlyDeduced, Depth, Used); | |||
5446 | break; | |||
5447 | } | |||
5448 | ||||
5449 | case Type::TemplateTypeParm: { | |||
5450 | const TemplateTypeParmType *TTP = cast<TemplateTypeParmType>(T); | |||
5451 | if (TTP->getDepth() == Depth) | |||
5452 | Used[TTP->getIndex()] = true; | |||
5453 | break; | |||
5454 | } | |||
5455 | ||||
5456 | case Type::SubstTemplateTypeParmPack: { | |||
5457 | const SubstTemplateTypeParmPackType *Subst | |||
5458 | = cast<SubstTemplateTypeParmPackType>(T); | |||
5459 | MarkUsedTemplateParameters(Ctx, | |||
5460 | QualType(Subst->getReplacedParameter(), 0), | |||
5461 | OnlyDeduced, Depth, Used); | |||
5462 | MarkUsedTemplateParameters(Ctx, Subst->getArgumentPack(), | |||
5463 | OnlyDeduced, Depth, Used); | |||
5464 | break; | |||
5465 | } | |||
5466 | ||||
5467 | case Type::InjectedClassName: | |||
5468 | T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); | |||
5469 | LLVM_FALLTHROUGH[[clang::fallthrough]]; | |||
5470 | ||||
5471 | case Type::TemplateSpecialization: { | |||
5472 | const TemplateSpecializationType *Spec | |||
5473 | = cast<TemplateSpecializationType>(T); | |||
5474 | MarkUsedTemplateParameters(Ctx, Spec->getTemplateName(), OnlyDeduced, | |||
5475 | Depth, Used); | |||
5476 | ||||
5477 | // C++0x [temp.deduct.type]p9: | |||
5478 | // If the template argument list of P contains a pack expansion that is | |||
5479 | // not the last template argument, the entire template argument list is a | |||
5480 | // non-deduced context. | |||
5481 | if (OnlyDeduced && | |||
5482 | hasPackExpansionBeforeEnd(Spec->template_arguments())) | |||
5483 | break; | |||
5484 | ||||
5485 | for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) | |||
5486 | MarkUsedTemplateParameters(Ctx, Spec->getArg(I), OnlyDeduced, Depth, | |||
5487 | Used); | |||
5488 | break; | |||
5489 | } | |||
5490 | ||||
5491 | case Type::Complex: | |||
5492 | if (!OnlyDeduced) | |||
5493 | MarkUsedTemplateParameters(Ctx, | |||
5494 | cast<ComplexType>(T)->getElementType(), | |||
5495 | OnlyDeduced, Depth, Used); | |||
5496 | break; | |||
5497 | ||||
5498 | case Type::Atomic: | |||
5499 | if (!OnlyDeduced) | |||
5500 | MarkUsedTemplateParameters(Ctx, | |||
5501 | cast<AtomicType>(T)->getValueType(), | |||
5502 | OnlyDeduced, Depth, Used); | |||
5503 | break; | |||
5504 | ||||
5505 | case Type::DependentName: | |||
5506 | if (!OnlyDeduced) | |||
5507 | MarkUsedTemplateParameters(Ctx, | |||
5508 | cast<DependentNameType>(T)->getQualifier(), | |||
5509 | OnlyDeduced, Depth, Used); | |||
5510 | break; | |||
5511 | ||||
5512 | case Type::DependentTemplateSpecialization: { | |||
5513 | // C++14 [temp.deduct.type]p5: | |||
5514 | // The non-deduced contexts are: | |||
5515 | // -- The nested-name-specifier of a type that was specified using a | |||
5516 | // qualified-id | |||
5517 | // | |||
5518 | // C++14 [temp.deduct.type]p6: | |||
5519 | // When a type name is specified in a way that includes a non-deduced | |||
5520 | // context, all of the types that comprise that type name are also | |||
5521 | // non-deduced. | |||
5522 | if (OnlyDeduced) | |||
5523 | break; | |||
5524 | ||||
5525 | const DependentTemplateSpecializationType *Spec | |||
5526 | = cast<DependentTemplateSpecializationType>(T); | |||
5527 | ||||
5528 | MarkUsedTemplateParameters(Ctx, Spec->getQualifier(), | |||
5529 | OnlyDeduced, Depth, Used); | |||
5530 | ||||
5531 | for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) | |||
5532 | MarkUsedTemplateParameters(Ctx, Spec->getArg(I), OnlyDeduced, Depth, | |||
5533 | Used); | |||
5534 | break; | |||
5535 | } | |||
5536 | ||||
5537 | case Type::TypeOf: | |||
5538 | if (!OnlyDeduced) | |||
5539 | MarkUsedTemplateParameters(Ctx, | |||
5540 | cast<TypeOfType>(T)->getUnderlyingType(), | |||
5541 | OnlyDeduced, Depth, Used); | |||
5542 | break; | |||
5543 | ||||
5544 | case Type::TypeOfExpr: | |||
5545 | if (!OnlyDeduced) | |||
5546 | MarkUsedTemplateParameters(Ctx, | |||
5547 | cast<TypeOfExprType>(T)->getUnderlyingExpr(), | |||
5548 | OnlyDeduced, Depth, Used); | |||
5549 | break; | |||
5550 | ||||
5551 | case Type::Decltype: | |||
5552 | if (!OnlyDeduced) | |||
5553 | MarkUsedTemplateParameters(Ctx, | |||
5554 | cast<DecltypeType>(T)->getUnderlyingExpr(), | |||
5555 | OnlyDeduced, Depth, Used); | |||
5556 | break; | |||
5557 | ||||
5558 | case Type::UnaryTransform: | |||
5559 | if (!OnlyDeduced) | |||
5560 | MarkUsedTemplateParameters(Ctx, | |||
5561 | cast<UnaryTransformType>(T)->getUnderlyingType(), | |||
5562 | OnlyDeduced, Depth, Used); | |||
5563 | break; | |||
5564 | ||||
5565 | case Type::PackExpansion: | |||
5566 | MarkUsedTemplateParameters(Ctx, | |||
5567 | cast<PackExpansionType>(T)->getPattern(), | |||
5568 | OnlyDeduced, Depth, Used); | |||
5569 | break; | |||
5570 | ||||
5571 | case Type::Auto: | |||
5572 | case Type::DeducedTemplateSpecialization: | |||
5573 | MarkUsedTemplateParameters(Ctx, | |||
5574 | cast<DeducedType>(T)->getDeducedType(), | |||
5575 | OnlyDeduced, Depth, Used); | |||
5576 | break; | |||
5577 | ||||
5578 | // None of these types have any template parameters in them. | |||
5579 | case Type::Builtin: | |||
5580 | case Type::VariableArray: | |||
5581 | case Type::FunctionNoProto: | |||
5582 | case Type::Record: | |||
5583 | case Type::Enum: | |||
5584 | case Type::ObjCInterface: | |||
5585 | case Type::ObjCObject: | |||
5586 | case Type::ObjCObjectPointer: | |||
5587 | case Type::UnresolvedUsing: | |||
5588 | case Type::Pipe: | |||
5589 | #define TYPE(Class, Base) | |||
5590 | #define ABSTRACT_TYPE(Class, Base) | |||
5591 | #define DEPENDENT_TYPE(Class, Base) | |||
5592 | #define NON_CANONICAL_TYPE(Class, Base) case Type::Class: | |||
5593 | #include "clang/AST/TypeNodes.def" | |||
5594 | break; | |||
5595 | } | |||
5596 | } | |||
5597 | ||||
5598 | /// Mark the template parameters that are used by this | |||
5599 | /// template argument. | |||
5600 | static void | |||
5601 | MarkUsedTemplateParameters(ASTContext &Ctx, | |||
5602 | const TemplateArgument &TemplateArg, | |||
5603 | bool OnlyDeduced, | |||
5604 | unsigned Depth, | |||
5605 | llvm::SmallBitVector &Used) { | |||
5606 | switch (TemplateArg.getKind()) { | |||
5607 | case TemplateArgument::Null: | |||
5608 | case TemplateArgument::Integral: | |||
5609 | case TemplateArgument::Declaration: | |||
5610 | break; | |||
5611 | ||||
5612 | case TemplateArgument::NullPtr: | |||
5613 | MarkUsedTemplateParameters(Ctx, TemplateArg.getNullPtrType(), OnlyDeduced, | |||
5614 | Depth, Used); | |||
5615 | break; | |||
5616 | ||||
5617 | case TemplateArgument::Type: | |||
5618 | MarkUsedTemplateParameters(Ctx, TemplateArg.getAsType(), OnlyDeduced, | |||
5619 | Depth, Used); | |||
5620 | break; | |||
5621 | ||||
5622 | case TemplateArgument::Template: | |||
5623 | case TemplateArgument::TemplateExpansion: | |||
5624 | MarkUsedTemplateParameters(Ctx, | |||
5625 | TemplateArg.getAsTemplateOrTemplatePattern(), | |||
5626 | OnlyDeduced, Depth, Used); | |||
5627 | break; | |||
5628 | ||||
5629 | case TemplateArgument::Expression: | |||
5630 | MarkUsedTemplateParameters(Ctx, TemplateArg.getAsExpr(), OnlyDeduced, | |||
5631 | Depth, Used); | |||
5632 | break; | |||
5633 | ||||
5634 | case TemplateArgument::Pack: | |||
5635 | for (const auto &P : TemplateArg.pack_elements()) | |||
5636 | MarkUsedTemplateParameters(Ctx, P, OnlyDeduced, Depth, Used); | |||
5637 | break; | |||
5638 | } | |||
5639 | } | |||
5640 | ||||
5641 | /// Mark which template parameters can be deduced from a given | |||
5642 | /// template argument list. | |||
5643 | /// | |||
5644 | /// \param TemplateArgs the template argument list from which template | |||
5645 | /// parameters will be deduced. | |||
5646 | /// | |||
5647 | /// \param Used a bit vector whose elements will be set to \c true | |||
5648 | /// to indicate when the corresponding template parameter will be | |||
5649 | /// deduced. | |||
5650 | void | |||
5651 | Sema::MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs, | |||
5652 | bool OnlyDeduced, unsigned Depth, | |||
5653 | llvm::SmallBitVector &Used) { | |||
5654 | // C++0x [temp.deduct.type]p9: | |||
5655 | // If the template argument list of P contains a pack expansion that is not | |||
5656 | // the last template argument, the entire template argument list is a | |||
5657 | // non-deduced context. | |||
5658 | if (OnlyDeduced && | |||
5659 | hasPackExpansionBeforeEnd(TemplateArgs.asArray())) | |||
5660 | return; | |||
5661 | ||||
5662 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) | |||
5663 | ::MarkUsedTemplateParameters(Context, TemplateArgs[I], OnlyDeduced, | |||
5664 | Depth, Used); | |||
5665 | } | |||
5666 | ||||
5667 | /// Marks all of the template parameters that will be deduced by a | |||
5668 | /// call to the given function template. | |||
5669 | void Sema::MarkDeducedTemplateParameters( | |||
5670 | ASTContext &Ctx, const FunctionTemplateDecl *FunctionTemplate, | |||
5671 | llvm::SmallBitVector &Deduced) { | |||
5672 | TemplateParameterList *TemplateParams | |||
5673 | = FunctionTemplate->getTemplateParameters(); | |||
5674 | Deduced.clear(); | |||
5675 | Deduced.resize(TemplateParams->size()); | |||
5676 | ||||
5677 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); | |||
5678 | for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) | |||
5679 | ::MarkUsedTemplateParameters(Ctx, Function->getParamDecl(I)->getType(), | |||
5680 | true, TemplateParams->getDepth(), Deduced); | |||
5681 | } | |||
5682 | ||||
5683 | bool hasDeducibleTemplateParameters(Sema &S, | |||
5684 | FunctionTemplateDecl *FunctionTemplate, | |||
5685 | QualType T) { | |||
5686 | if (!T->isDependentType()) | |||
5687 | return false; | |||
5688 | ||||
5689 | TemplateParameterList *TemplateParams | |||
5690 | = FunctionTemplate->getTemplateParameters(); | |||
5691 | llvm::SmallBitVector Deduced(TemplateParams->size()); | |||
5692 | ::MarkUsedTemplateParameters(S.Context, T, true, TemplateParams->getDepth(), | |||
5693 | Deduced); | |||
5694 | ||||
5695 | return Deduced.any(); | |||
5696 | } |
1 | //===- llvm/ADT/SmallBitVector.h - 'Normally small' bit vectors -*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file implements the SmallBitVector class. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #ifndef LLVM_ADT_SMALLBITVECTOR_H |
14 | #define LLVM_ADT_SMALLBITVECTOR_H |
15 | |
16 | #include "llvm/ADT/BitVector.h" |
17 | #include "llvm/ADT/iterator_range.h" |
18 | #include "llvm/Support/MathExtras.h" |
19 | #include <algorithm> |
20 | #include <cassert> |
21 | #include <climits> |
22 | #include <cstddef> |
23 | #include <cstdint> |
24 | #include <limits> |
25 | #include <utility> |
26 | |
27 | namespace llvm { |
28 | |
29 | /// This is a 'bitvector' (really, a variable-sized bit array), optimized for |
30 | /// the case when the array is small. It contains one pointer-sized field, which |
31 | /// is directly used as a plain collection of bits when possible, or as a |
32 | /// pointer to a larger heap-allocated array when necessary. This allows normal |
33 | /// "small" cases to be fast without losing generality for large inputs. |
34 | class SmallBitVector { |
35 | // TODO: In "large" mode, a pointer to a BitVector is used, leading to an |
36 | // unnecessary level of indirection. It would be more efficient to use a |
37 | // pointer to memory containing size, allocation size, and the array of bits. |
38 | uintptr_t X = 1; |
39 | |
40 | enum { |
41 | // The number of bits in this class. |
42 | NumBaseBits = sizeof(uintptr_t) * CHAR_BIT8, |
43 | |
44 | // One bit is used to discriminate between small and large mode. The |
45 | // remaining bits are used for the small-mode representation. |
46 | SmallNumRawBits = NumBaseBits - 1, |
47 | |
48 | // A few more bits are used to store the size of the bit set in small mode. |
49 | // Theoretically this is a ceil-log2. These bits are encoded in the most |
50 | // significant bits of the raw bits. |
51 | SmallNumSizeBits = (NumBaseBits == 32 ? 5 : |
52 | NumBaseBits == 64 ? 6 : |
53 | SmallNumRawBits), |
54 | |
55 | // The remaining bits are used to store the actual set in small mode. |
56 | SmallNumDataBits = SmallNumRawBits - SmallNumSizeBits |
57 | }; |
58 | |
59 | static_assert(NumBaseBits == 64 || NumBaseBits == 32, |
60 | "Unsupported word size"); |
61 | |
62 | public: |
63 | using size_type = unsigned; |
64 | |
65 | // Encapsulation of a single bit. |
66 | class reference { |
67 | SmallBitVector &TheVector; |
68 | unsigned BitPos; |
69 | |
70 | public: |
71 | reference(SmallBitVector &b, unsigned Idx) : TheVector(b), BitPos(Idx) {} |
72 | |
73 | reference(const reference&) = default; |
74 | |
75 | reference& operator=(reference t) { |
76 | *this = bool(t); |
77 | return *this; |
78 | } |
79 | |
80 | reference& operator=(bool t) { |
81 | if (t) |
82 | TheVector.set(BitPos); |
83 | else |
84 | TheVector.reset(BitPos); |
85 | return *this; |
86 | } |
87 | |
88 | operator bool() const { |
89 | return const_cast<const SmallBitVector &>(TheVector).operator[](BitPos); |
90 | } |
91 | }; |
92 | |
93 | private: |
94 | BitVector *getPointer() const { |
95 | assert(!isSmall())((!isSmall()) ? static_cast<void> (0) : __assert_fail ( "!isSmall()", "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 95, __PRETTY_FUNCTION__)); |
96 | return reinterpret_cast<BitVector *>(X); |
97 | } |
98 | |
99 | void switchToSmall(uintptr_t NewSmallBits, size_t NewSize) { |
100 | X = 1; |
101 | setSmallSize(NewSize); |
102 | setSmallBits(NewSmallBits); |
103 | } |
104 | |
105 | void switchToLarge(BitVector *BV) { |
106 | X = reinterpret_cast<uintptr_t>(BV); |
107 | assert(!isSmall() && "Tried to use an unaligned pointer")((!isSmall() && "Tried to use an unaligned pointer") ? static_cast<void> (0) : __assert_fail ("!isSmall() && \"Tried to use an unaligned pointer\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 107, __PRETTY_FUNCTION__)); |
108 | } |
109 | |
110 | // Return all the bits used for the "small" representation; this includes |
111 | // bits for the size as well as the element bits. |
112 | uintptr_t getSmallRawBits() const { |
113 | assert(isSmall())((isSmall()) ? static_cast<void> (0) : __assert_fail ("isSmall()" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 113, __PRETTY_FUNCTION__)); |
114 | return X >> 1; |
115 | } |
116 | |
117 | void setSmallRawBits(uintptr_t NewRawBits) { |
118 | assert(isSmall())((isSmall()) ? static_cast<void> (0) : __assert_fail ("isSmall()" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 118, __PRETTY_FUNCTION__)); |
119 | X = (NewRawBits << 1) | uintptr_t(1); |
120 | } |
121 | |
122 | // Return the size. |
123 | size_t getSmallSize() const { return getSmallRawBits() >> SmallNumDataBits; } |
124 | |
125 | void setSmallSize(size_t Size) { |
126 | setSmallRawBits(getSmallBits() | (Size << SmallNumDataBits)); |
127 | } |
128 | |
129 | // Return the element bits. |
130 | uintptr_t getSmallBits() const { |
131 | return getSmallRawBits() & ~(~uintptr_t(0) << getSmallSize()); |
132 | } |
133 | |
134 | void setSmallBits(uintptr_t NewBits) { |
135 | setSmallRawBits((NewBits & ~(~uintptr_t(0) << getSmallSize())) | |
136 | (getSmallSize() << SmallNumDataBits)); |
137 | } |
138 | |
139 | public: |
140 | /// Creates an empty bitvector. |
141 | SmallBitVector() = default; |
142 | |
143 | /// Creates a bitvector of specified number of bits. All bits are initialized |
144 | /// to the specified value. |
145 | explicit SmallBitVector(unsigned s, bool t = false) { |
146 | if (s <= SmallNumDataBits) |
147 | switchToSmall(t ? ~uintptr_t(0) : 0, s); |
148 | else |
149 | switchToLarge(new BitVector(s, t)); |
150 | } |
151 | |
152 | /// SmallBitVector copy ctor. |
153 | SmallBitVector(const SmallBitVector &RHS) { |
154 | if (RHS.isSmall()) |
155 | X = RHS.X; |
156 | else |
157 | switchToLarge(new BitVector(*RHS.getPointer())); |
158 | } |
159 | |
160 | SmallBitVector(SmallBitVector &&RHS) : X(RHS.X) { |
161 | RHS.X = 1; |
162 | } |
163 | |
164 | ~SmallBitVector() { |
165 | if (!isSmall()) |
166 | delete getPointer(); |
167 | } |
168 | |
169 | using const_set_bits_iterator = const_set_bits_iterator_impl<SmallBitVector>; |
170 | using set_iterator = const_set_bits_iterator; |
171 | |
172 | const_set_bits_iterator set_bits_begin() const { |
173 | return const_set_bits_iterator(*this); |
174 | } |
175 | |
176 | const_set_bits_iterator set_bits_end() const { |
177 | return const_set_bits_iterator(*this, -1); |
178 | } |
179 | |
180 | iterator_range<const_set_bits_iterator> set_bits() const { |
181 | return make_range(set_bits_begin(), set_bits_end()); |
182 | } |
183 | |
184 | bool isSmall() const { return X & uintptr_t(1); } |
185 | |
186 | /// Tests whether there are no bits in this bitvector. |
187 | bool empty() const { |
188 | return isSmall() ? getSmallSize() == 0 : getPointer()->empty(); |
189 | } |
190 | |
191 | /// Returns the number of bits in this bitvector. |
192 | size_t size() const { |
193 | return isSmall() ? getSmallSize() : getPointer()->size(); |
194 | } |
195 | |
196 | /// Returns the number of bits which are set. |
197 | size_type count() const { |
198 | if (isSmall()) { |
199 | uintptr_t Bits = getSmallBits(); |
200 | return countPopulation(Bits); |
201 | } |
202 | return getPointer()->count(); |
203 | } |
204 | |
205 | /// Returns true if any bit is set. |
206 | bool any() const { |
207 | if (isSmall()) |
208 | return getSmallBits() != 0; |
209 | return getPointer()->any(); |
210 | } |
211 | |
212 | /// Returns true if all bits are set. |
213 | bool all() const { |
214 | if (isSmall()) |
215 | return getSmallBits() == (uintptr_t(1) << getSmallSize()) - 1; |
216 | return getPointer()->all(); |
217 | } |
218 | |
219 | /// Returns true if none of the bits are set. |
220 | bool none() const { |
221 | if (isSmall()) |
222 | return getSmallBits() == 0; |
223 | return getPointer()->none(); |
224 | } |
225 | |
226 | /// Returns the index of the first set bit, -1 if none of the bits are set. |
227 | int find_first() const { |
228 | if (isSmall()) { |
229 | uintptr_t Bits = getSmallBits(); |
230 | if (Bits == 0) |
231 | return -1; |
232 | return countTrailingZeros(Bits); |
233 | } |
234 | return getPointer()->find_first(); |
235 | } |
236 | |
237 | int find_last() const { |
238 | if (isSmall()) { |
239 | uintptr_t Bits = getSmallBits(); |
240 | if (Bits == 0) |
241 | return -1; |
242 | return NumBaseBits - countLeadingZeros(Bits) - 1; |
243 | } |
244 | return getPointer()->find_last(); |
245 | } |
246 | |
247 | /// Returns the index of the first unset bit, -1 if all of the bits are set. |
248 | int find_first_unset() const { |
249 | if (isSmall()) { |
250 | if (count() == getSmallSize()) |
251 | return -1; |
252 | |
253 | uintptr_t Bits = getSmallBits(); |
254 | return countTrailingOnes(Bits); |
255 | } |
256 | return getPointer()->find_first_unset(); |
257 | } |
258 | |
259 | int find_last_unset() const { |
260 | if (isSmall()) { |
261 | if (count() == getSmallSize()) |
262 | return -1; |
263 | |
264 | uintptr_t Bits = getSmallBits(); |
265 | // Set unused bits. |
266 | Bits |= ~uintptr_t(0) << getSmallSize(); |
267 | return NumBaseBits - countLeadingOnes(Bits) - 1; |
268 | } |
269 | return getPointer()->find_last_unset(); |
270 | } |
271 | |
272 | /// Returns the index of the next set bit following the "Prev" bit. |
273 | /// Returns -1 if the next set bit is not found. |
274 | int find_next(unsigned Prev) const { |
275 | if (isSmall()) { |
276 | uintptr_t Bits = getSmallBits(); |
277 | // Mask off previous bits. |
278 | Bits &= ~uintptr_t(0) << (Prev + 1); |
279 | if (Bits == 0 || Prev + 1 >= getSmallSize()) |
280 | return -1; |
281 | return countTrailingZeros(Bits); |
282 | } |
283 | return getPointer()->find_next(Prev); |
284 | } |
285 | |
286 | /// Returns the index of the next unset bit following the "Prev" bit. |
287 | /// Returns -1 if the next unset bit is not found. |
288 | int find_next_unset(unsigned Prev) const { |
289 | if (isSmall()) { |
290 | ++Prev; |
291 | uintptr_t Bits = getSmallBits(); |
292 | // Mask in previous bits. |
293 | uintptr_t Mask = (1 << Prev) - 1; |
294 | Bits |= Mask; |
295 | |
296 | if (Bits == ~uintptr_t(0) || Prev + 1 >= getSmallSize()) |
297 | return -1; |
298 | return countTrailingOnes(Bits); |
299 | } |
300 | return getPointer()->find_next_unset(Prev); |
301 | } |
302 | |
303 | /// find_prev - Returns the index of the first set bit that precedes the |
304 | /// the bit at \p PriorTo. Returns -1 if all previous bits are unset. |
305 | int find_prev(unsigned PriorTo) const { |
306 | if (isSmall()) { |
307 | if (PriorTo == 0) |
308 | return -1; |
309 | |
310 | --PriorTo; |
311 | uintptr_t Bits = getSmallBits(); |
312 | Bits &= maskTrailingOnes<uintptr_t>(PriorTo + 1); |
313 | if (Bits == 0) |
314 | return -1; |
315 | |
316 | return NumBaseBits - countLeadingZeros(Bits) - 1; |
317 | } |
318 | return getPointer()->find_prev(PriorTo); |
319 | } |
320 | |
321 | /// Clear all bits. |
322 | void clear() { |
323 | if (!isSmall()) |
324 | delete getPointer(); |
325 | switchToSmall(0, 0); |
326 | } |
327 | |
328 | /// Grow or shrink the bitvector. |
329 | void resize(unsigned N, bool t = false) { |
330 | if (!isSmall()) { |
331 | getPointer()->resize(N, t); |
332 | } else if (SmallNumDataBits >= N) { |
333 | uintptr_t NewBits = t ? ~uintptr_t(0) << getSmallSize() : 0; |
334 | setSmallSize(N); |
335 | setSmallBits(NewBits | getSmallBits()); |
336 | } else { |
337 | BitVector *BV = new BitVector(N, t); |
338 | uintptr_t OldBits = getSmallBits(); |
339 | for (size_t i = 0, e = getSmallSize(); i != e; ++i) |
340 | (*BV)[i] = (OldBits >> i) & 1; |
341 | switchToLarge(BV); |
342 | } |
343 | } |
344 | |
345 | void reserve(unsigned N) { |
346 | if (isSmall()) { |
347 | if (N > SmallNumDataBits) { |
348 | uintptr_t OldBits = getSmallRawBits(); |
349 | size_t SmallSize = getSmallSize(); |
350 | BitVector *BV = new BitVector(SmallSize); |
351 | for (size_t i = 0; i < SmallSize; ++i) |
352 | if ((OldBits >> i) & 1) |
353 | BV->set(i); |
354 | BV->reserve(N); |
355 | switchToLarge(BV); |
356 | } |
357 | } else { |
358 | getPointer()->reserve(N); |
359 | } |
360 | } |
361 | |
362 | // Set, reset, flip |
363 | SmallBitVector &set() { |
364 | if (isSmall()) |
365 | setSmallBits(~uintptr_t(0)); |
366 | else |
367 | getPointer()->set(); |
368 | return *this; |
369 | } |
370 | |
371 | SmallBitVector &set(unsigned Idx) { |
372 | if (isSmall()) { |
373 | assert(Idx <= static_cast<unsigned>(((Idx <= static_cast<unsigned>( std::numeric_limits< uintptr_t>::digits) && "undefined behavior") ? static_cast <void> (0) : __assert_fail ("Idx <= static_cast<unsigned>( std::numeric_limits<uintptr_t>::digits) && \"undefined behavior\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 375, __PRETTY_FUNCTION__)) |
374 | std::numeric_limits<uintptr_t>::digits) &&((Idx <= static_cast<unsigned>( std::numeric_limits< uintptr_t>::digits) && "undefined behavior") ? static_cast <void> (0) : __assert_fail ("Idx <= static_cast<unsigned>( std::numeric_limits<uintptr_t>::digits) && \"undefined behavior\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 375, __PRETTY_FUNCTION__)) |
375 | "undefined behavior")((Idx <= static_cast<unsigned>( std::numeric_limits< uintptr_t>::digits) && "undefined behavior") ? static_cast <void> (0) : __assert_fail ("Idx <= static_cast<unsigned>( std::numeric_limits<uintptr_t>::digits) && \"undefined behavior\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 375, __PRETTY_FUNCTION__)); |
376 | setSmallBits(getSmallBits() | (uintptr_t(1) << Idx)); |
377 | } |
378 | else |
379 | getPointer()->set(Idx); |
380 | return *this; |
381 | } |
382 | |
383 | /// Efficiently set a range of bits in [I, E) |
384 | SmallBitVector &set(unsigned I, unsigned E) { |
385 | assert(I <= E && "Attempted to set backwards range!")((I <= E && "Attempted to set backwards range!") ? static_cast<void> (0) : __assert_fail ("I <= E && \"Attempted to set backwards range!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 385, __PRETTY_FUNCTION__)); |
386 | assert(E <= size() && "Attempted to set out-of-bounds range!")((E <= size() && "Attempted to set out-of-bounds range!" ) ? static_cast<void> (0) : __assert_fail ("E <= size() && \"Attempted to set out-of-bounds range!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 386, __PRETTY_FUNCTION__)); |
387 | if (I == E) return *this; |
388 | if (isSmall()) { |
389 | uintptr_t EMask = ((uintptr_t)1) << E; |
390 | uintptr_t IMask = ((uintptr_t)1) << I; |
391 | uintptr_t Mask = EMask - IMask; |
392 | setSmallBits(getSmallBits() | Mask); |
393 | } else |
394 | getPointer()->set(I, E); |
395 | return *this; |
396 | } |
397 | |
398 | SmallBitVector &reset() { |
399 | if (isSmall()) |
400 | setSmallBits(0); |
401 | else |
402 | getPointer()->reset(); |
403 | return *this; |
404 | } |
405 | |
406 | SmallBitVector &reset(unsigned Idx) { |
407 | if (isSmall()) |
408 | setSmallBits(getSmallBits() & ~(uintptr_t(1) << Idx)); |
409 | else |
410 | getPointer()->reset(Idx); |
411 | return *this; |
412 | } |
413 | |
414 | /// Efficiently reset a range of bits in [I, E) |
415 | SmallBitVector &reset(unsigned I, unsigned E) { |
416 | assert(I <= E && "Attempted to reset backwards range!")((I <= E && "Attempted to reset backwards range!") ? static_cast<void> (0) : __assert_fail ("I <= E && \"Attempted to reset backwards range!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 416, __PRETTY_FUNCTION__)); |
417 | assert(E <= size() && "Attempted to reset out-of-bounds range!")((E <= size() && "Attempted to reset out-of-bounds range!" ) ? static_cast<void> (0) : __assert_fail ("E <= size() && \"Attempted to reset out-of-bounds range!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 417, __PRETTY_FUNCTION__)); |
418 | if (I == E) return *this; |
419 | if (isSmall()) { |
420 | uintptr_t EMask = ((uintptr_t)1) << E; |
421 | uintptr_t IMask = ((uintptr_t)1) << I; |
422 | uintptr_t Mask = EMask - IMask; |
423 | setSmallBits(getSmallBits() & ~Mask); |
424 | } else |
425 | getPointer()->reset(I, E); |
426 | return *this; |
427 | } |
428 | |
429 | SmallBitVector &flip() { |
430 | if (isSmall()) |
431 | setSmallBits(~getSmallBits()); |
432 | else |
433 | getPointer()->flip(); |
434 | return *this; |
435 | } |
436 | |
437 | SmallBitVector &flip(unsigned Idx) { |
438 | if (isSmall()) |
439 | setSmallBits(getSmallBits() ^ (uintptr_t(1) << Idx)); |
440 | else |
441 | getPointer()->flip(Idx); |
442 | return *this; |
443 | } |
444 | |
445 | // No argument flip. |
446 | SmallBitVector operator~() const { |
447 | return SmallBitVector(*this).flip(); |
448 | } |
449 | |
450 | // Indexing. |
451 | reference operator[](unsigned Idx) { |
452 | assert(Idx < size() && "Out-of-bounds Bit access.")((Idx < size() && "Out-of-bounds Bit access.") ? static_cast <void> (0) : __assert_fail ("Idx < size() && \"Out-of-bounds Bit access.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 452, __PRETTY_FUNCTION__)); |
453 | return reference(*this, Idx); |
454 | } |
455 | |
456 | bool operator[](unsigned Idx) const { |
457 | assert(Idx < size() && "Out-of-bounds Bit access.")((Idx < size() && "Out-of-bounds Bit access.") ? static_cast <void> (0) : __assert_fail ("Idx < size() && \"Out-of-bounds Bit access.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 457, __PRETTY_FUNCTION__)); |
458 | if (isSmall()) |
459 | return ((getSmallBits() >> Idx) & 1) != 0; |
460 | return getPointer()->operator[](Idx); |
461 | } |
462 | |
463 | bool test(unsigned Idx) const { |
464 | return (*this)[Idx]; |
465 | } |
466 | |
467 | // Push single bit to end of vector. |
468 | void push_back(bool Val) { |
469 | resize(size() + 1, Val); |
470 | } |
471 | |
472 | /// Test if any common bits are set. |
473 | bool anyCommon(const SmallBitVector &RHS) const { |
474 | if (isSmall() && RHS.isSmall()) |
475 | return (getSmallBits() & RHS.getSmallBits()) != 0; |
476 | if (!isSmall() && !RHS.isSmall()) |
477 | return getPointer()->anyCommon(*RHS.getPointer()); |
478 | |
479 | for (unsigned i = 0, e = std::min(size(), RHS.size()); i != e; ++i) |
480 | if (test(i) && RHS.test(i)) |
481 | return true; |
482 | return false; |
483 | } |
484 | |
485 | // Comparison operators. |
486 | bool operator==(const SmallBitVector &RHS) const { |
487 | if (size() != RHS.size()) |
488 | return false; |
489 | if (isSmall() && RHS.isSmall()) |
490 | return getSmallBits() == RHS.getSmallBits(); |
491 | else if (!isSmall() && !RHS.isSmall()) |
492 | return *getPointer() == *RHS.getPointer(); |
493 | else { |
494 | for (size_t i = 0, e = size(); i != e; ++i) { |
495 | if ((*this)[i] != RHS[i]) |
496 | return false; |
497 | } |
498 | return true; |
499 | } |
500 | } |
501 | |
502 | bool operator!=(const SmallBitVector &RHS) const { |
503 | return !(*this == RHS); |
504 | } |
505 | |
506 | // Intersection, union, disjoint union. |
507 | // FIXME BitVector::operator&= does not resize the LHS but this does |
508 | SmallBitVector &operator&=(const SmallBitVector &RHS) { |
509 | resize(std::max(size(), RHS.size())); |
510 | if (isSmall() && RHS.isSmall()) |
511 | setSmallBits(getSmallBits() & RHS.getSmallBits()); |
512 | else if (!isSmall() && !RHS.isSmall()) |
513 | getPointer()->operator&=(*RHS.getPointer()); |
514 | else { |
515 | size_t i, e; |
516 | for (i = 0, e = std::min(size(), RHS.size()); i != e; ++i) |
517 | (*this)[i] = test(i) && RHS.test(i); |
518 | for (e = size(); i != e; ++i) |
519 | reset(i); |
520 | } |
521 | return *this; |
522 | } |
523 | |
524 | /// Reset bits that are set in RHS. Same as *this &= ~RHS. |
525 | SmallBitVector &reset(const SmallBitVector &RHS) { |
526 | if (isSmall() && RHS.isSmall()) |
527 | setSmallBits(getSmallBits() & ~RHS.getSmallBits()); |
528 | else if (!isSmall() && !RHS.isSmall()) |
529 | getPointer()->reset(*RHS.getPointer()); |
530 | else |
531 | for (unsigned i = 0, e = std::min(size(), RHS.size()); i != e; ++i) |
532 | if (RHS.test(i)) |
533 | reset(i); |
534 | |
535 | return *this; |
536 | } |
537 | |
538 | /// Check if (This - RHS) is zero. This is the same as reset(RHS) and any(). |
539 | bool test(const SmallBitVector &RHS) const { |
540 | if (isSmall() && RHS.isSmall()) |
541 | return (getSmallBits() & ~RHS.getSmallBits()) != 0; |
542 | if (!isSmall() && !RHS.isSmall()) |
543 | return getPointer()->test(*RHS.getPointer()); |
544 | |
545 | unsigned i, e; |
546 | for (i = 0, e = std::min(size(), RHS.size()); i != e; ++i) |
547 | if (test(i) && !RHS.test(i)) |
548 | return true; |
549 | |
550 | for (e = size(); i != e; ++i) |
551 | if (test(i)) |
552 | return true; |
553 | |
554 | return false; |
555 | } |
556 | |
557 | SmallBitVector &operator|=(const SmallBitVector &RHS) { |
558 | resize(std::max(size(), RHS.size())); |
559 | if (isSmall() && RHS.isSmall()) |
560 | setSmallBits(getSmallBits() | RHS.getSmallBits()); |
561 | else if (!isSmall() && !RHS.isSmall()) |
562 | getPointer()->operator|=(*RHS.getPointer()); |
563 | else { |
564 | for (size_t i = 0, e = RHS.size(); i != e; ++i) |
565 | (*this)[i] = test(i) || RHS.test(i); |
566 | } |
567 | return *this; |
568 | } |
569 | |
570 | SmallBitVector &operator^=(const SmallBitVector &RHS) { |
571 | resize(std::max(size(), RHS.size())); |
572 | if (isSmall() && RHS.isSmall()) |
573 | setSmallBits(getSmallBits() ^ RHS.getSmallBits()); |
574 | else if (!isSmall() && !RHS.isSmall()) |
575 | getPointer()->operator^=(*RHS.getPointer()); |
576 | else { |
577 | for (size_t i = 0, e = RHS.size(); i != e; ++i) |
578 | (*this)[i] = test(i) != RHS.test(i); |
579 | } |
580 | return *this; |
581 | } |
582 | |
583 | SmallBitVector &operator<<=(unsigned N) { |
584 | if (isSmall()) |
585 | setSmallBits(getSmallBits() << N); |
586 | else |
587 | getPointer()->operator<<=(N); |
588 | return *this; |
589 | } |
590 | |
591 | SmallBitVector &operator>>=(unsigned N) { |
592 | if (isSmall()) |
593 | setSmallBits(getSmallBits() >> N); |
594 | else |
595 | getPointer()->operator>>=(N); |
596 | return *this; |
597 | } |
598 | |
599 | // Assignment operator. |
600 | const SmallBitVector &operator=(const SmallBitVector &RHS) { |
601 | if (isSmall()) { |
602 | if (RHS.isSmall()) |
603 | X = RHS.X; |
604 | else |
605 | switchToLarge(new BitVector(*RHS.getPointer())); |
606 | } else { |
607 | if (!RHS.isSmall()) |
608 | *getPointer() = *RHS.getPointer(); |
609 | else { |
610 | delete getPointer(); |
611 | X = RHS.X; |
612 | } |
613 | } |
614 | return *this; |
615 | } |
616 | |
617 | const SmallBitVector &operator=(SmallBitVector &&RHS) { |
618 | if (this != &RHS) { |
619 | clear(); |
620 | swap(RHS); |
621 | } |
622 | return *this; |
623 | } |
624 | |
625 | void swap(SmallBitVector &RHS) { |
626 | std::swap(X, RHS.X); |
627 | } |
628 | |
629 | /// Add '1' bits from Mask to this vector. Don't resize. |
630 | /// This computes "*this |= Mask". |
631 | void setBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) { |
632 | if (isSmall()) |
633 | applyMask<true, false>(Mask, MaskWords); |
634 | else |
635 | getPointer()->setBitsInMask(Mask, MaskWords); |
636 | } |
637 | |
638 | /// Clear any bits in this vector that are set in Mask. Don't resize. |
639 | /// This computes "*this &= ~Mask". |
640 | void clearBitsInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) { |
641 | if (isSmall()) |
642 | applyMask<false, false>(Mask, MaskWords); |
643 | else |
644 | getPointer()->clearBitsInMask(Mask, MaskWords); |
645 | } |
646 | |
647 | /// Add a bit to this vector for every '0' bit in Mask. Don't resize. |
648 | /// This computes "*this |= ~Mask". |
649 | void setBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) { |
650 | if (isSmall()) |
651 | applyMask<true, true>(Mask, MaskWords); |
652 | else |
653 | getPointer()->setBitsNotInMask(Mask, MaskWords); |
654 | } |
655 | |
656 | /// Clear a bit in this vector for every '0' bit in Mask. Don't resize. |
657 | /// This computes "*this &= Mask". |
658 | void clearBitsNotInMask(const uint32_t *Mask, unsigned MaskWords = ~0u) { |
659 | if (isSmall()) |
660 | applyMask<false, true>(Mask, MaskWords); |
661 | else |
662 | getPointer()->clearBitsNotInMask(Mask, MaskWords); |
663 | } |
664 | |
665 | private: |
666 | template <bool AddBits, bool InvertMask> |
667 | void applyMask(const uint32_t *Mask, unsigned MaskWords) { |
668 | assert(MaskWords <= sizeof(uintptr_t) && "Mask is larger than base!")((MaskWords <= sizeof(uintptr_t) && "Mask is larger than base!" ) ? static_cast<void> (0) : __assert_fail ("MaskWords <= sizeof(uintptr_t) && \"Mask is larger than base!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/ADT/SmallBitVector.h" , 668, __PRETTY_FUNCTION__)); |
669 | uintptr_t M = Mask[0]; |
670 | if (NumBaseBits == 64) |
671 | M |= uint64_t(Mask[1]) << 32; |
672 | if (InvertMask) |
673 | M = ~M; |
674 | if (AddBits) |
675 | setSmallBits(getSmallBits() | M); |
676 | else |
677 | setSmallBits(getSmallBits() & ~M); |
678 | } |
679 | }; |
680 | |
681 | inline SmallBitVector |
682 | operator&(const SmallBitVector &LHS, const SmallBitVector &RHS) { |
683 | SmallBitVector Result(LHS); |
684 | Result &= RHS; |
685 | return Result; |
686 | } |
687 | |
688 | inline SmallBitVector |
689 | operator|(const SmallBitVector &LHS, const SmallBitVector &RHS) { |
690 | SmallBitVector Result(LHS); |
691 | Result |= RHS; |
692 | return Result; |
693 | } |
694 | |
695 | inline SmallBitVector |
696 | operator^(const SmallBitVector &LHS, const SmallBitVector &RHS) { |
697 | SmallBitVector Result(LHS); |
698 | Result ^= RHS; |
699 | return Result; |
700 | } |
701 | |
702 | } // end namespace llvm |
703 | |
704 | namespace std { |
705 | |
706 | /// Implement std::swap in terms of BitVector swap. |
707 | inline void |
708 | swap(llvm::SmallBitVector &LHS, llvm::SmallBitVector &RHS) { |
709 | LHS.swap(RHS); |
710 | } |
711 | |
712 | } // end namespace std |
713 | |
714 | #endif // LLVM_ADT_SMALLBITVECTOR_H |