LLVM 19.0.0git
ModuleUtils.cpp
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1//===-- ModuleUtils.cpp - Functions to manipulate Modules -----------------===//
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 family of functions perform manipulations on Modules.
10//
11//===----------------------------------------------------------------------===//
12
17#include "llvm/IR/Function.h"
18#include "llvm/IR/IRBuilder.h"
19#include "llvm/IR/MDBuilder.h"
20#include "llvm/IR/Module.h"
22#include "llvm/Support/xxhash.h"
23
24using namespace llvm;
25
26#define DEBUG_TYPE "moduleutils"
27
28static void appendToGlobalArray(StringRef ArrayName, Module &M, Function *F,
29 int Priority, Constant *Data) {
30 IRBuilder<> IRB(M.getContext());
31 FunctionType *FnTy = FunctionType::get(IRB.getVoidTy(), false);
32
33 // Get the current set of static global constructors and add the new ctor
34 // to the list.
35 SmallVector<Constant *, 16> CurrentCtors;
36 StructType *EltTy;
37 if (GlobalVariable *GVCtor = M.getNamedGlobal(ArrayName)) {
38 EltTy = cast<StructType>(GVCtor->getValueType()->getArrayElementType());
39 if (Constant *Init = GVCtor->getInitializer()) {
40 unsigned n = Init->getNumOperands();
41 CurrentCtors.reserve(n + 1);
42 for (unsigned i = 0; i != n; ++i)
43 CurrentCtors.push_back(cast<Constant>(Init->getOperand(i)));
44 }
45 GVCtor->eraseFromParent();
46 } else {
47 EltTy = StructType::get(IRB.getInt32Ty(),
48 PointerType::get(FnTy, F->getAddressSpace()),
49 IRB.getPtrTy());
50 }
51
52 // Build a 3 field global_ctor entry. We don't take a comdat key.
53 Constant *CSVals[3];
54 CSVals[0] = IRB.getInt32(Priority);
55 CSVals[1] = F;
56 CSVals[2] = Data ? ConstantExpr::getPointerCast(Data, IRB.getPtrTy())
58 Constant *RuntimeCtorInit =
59 ConstantStruct::get(EltTy, ArrayRef(CSVals, EltTy->getNumElements()));
60
61 CurrentCtors.push_back(RuntimeCtorInit);
62
63 // Create a new initializer.
64 ArrayType *AT = ArrayType::get(EltTy, CurrentCtors.size());
65 Constant *NewInit = ConstantArray::get(AT, CurrentCtors);
66
67 // Create the new global variable and replace all uses of
68 // the old global variable with the new one.
69 (void)new GlobalVariable(M, NewInit->getType(), false,
70 GlobalValue::AppendingLinkage, NewInit, ArrayName);
71}
72
73void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority, Constant *Data) {
74 appendToGlobalArray("llvm.global_ctors", M, F, Priority, Data);
75}
76
77void llvm::appendToGlobalDtors(Module &M, Function *F, int Priority, Constant *Data) {
78 appendToGlobalArray("llvm.global_dtors", M, F, Priority, Data);
79}
80
83 if (!GV || !GV->hasInitializer())
84 return;
85
86 auto *CA = cast<ConstantArray>(GV->getInitializer());
87 for (Use &Op : CA->operands())
88 Init.insert(cast<Constant>(Op));
89}
90
92 GlobalVariable *GV = M.getGlobalVariable(Name);
93
96 if (GV)
97 GV->eraseFromParent();
98
99 Type *ArrayEltTy = llvm::PointerType::getUnqual(M.getContext());
100 for (auto *V : Values)
102
103 if (Init.empty())
104 return;
105
106 ArrayType *ATy = ArrayType::get(ArrayEltTy, Init.size());
108 ConstantArray::get(ATy, Init.getArrayRef()),
109 Name);
110 GV->setSection("llvm.metadata");
111}
112
114 appendToUsedList(M, "llvm.used", Values);
115}
116
118 appendToUsedList(M, "llvm.compiler.used", Values);
119}
120
122 function_ref<bool(Constant *)> ShouldRemove) {
123 GlobalVariable *GV = M.getNamedGlobal(Name);
124 if (!GV)
125 return;
126
129
130 Type *ArrayEltTy = cast<ArrayType>(GV->getValueType())->getElementType();
131
133 for (Constant *MaybeRemoved : Init) {
134 if (!ShouldRemove(MaybeRemoved->stripPointerCasts()))
135 NewInit.push_back(MaybeRemoved);
136 }
137
138 if (!NewInit.empty()) {
139 ArrayType *ATy = ArrayType::get(ArrayEltTy, NewInit.size());
140 GlobalVariable *NewGV =
142 ConstantArray::get(ATy, NewInit), "", GV,
144 NewGV->setSection(GV->getSection());
145 NewGV->takeName(GV);
146 }
147
148 GV->eraseFromParent();
149}
150
152 function_ref<bool(Constant *)> ShouldRemove) {
153 removeFromUsedList(M, "llvm.used", ShouldRemove);
154 removeFromUsedList(M, "llvm.compiler.used", ShouldRemove);
155}
156
157void llvm::setKCFIType(Module &M, Function &F, StringRef MangledType) {
158 if (!M.getModuleFlag("kcfi"))
159 return;
160 // Matches CodeGenModule::CreateKCFITypeId in Clang.
161 LLVMContext &Ctx = M.getContext();
162 MDBuilder MDB(Ctx);
163 F.setMetadata(
164 LLVMContext::MD_kcfi_type,
165 MDNode::get(Ctx, MDB.createConstant(ConstantInt::get(
166 Type::getInt32Ty(Ctx),
167 static_cast<uint32_t>(xxHash64(MangledType))))));
168 // If the module was compiled with -fpatchable-function-entry, ensure
169 // we use the same patchable-function-prefix.
170 if (auto *MD = mdconst::extract_or_null<ConstantInt>(
171 M.getModuleFlag("kcfi-offset"))) {
172 if (unsigned Offset = MD->getZExtValue())
173 F.addFnAttr("patchable-function-prefix", std::to_string(Offset));
174 }
175}
176
178 ArrayRef<Type *> InitArgTypes,
179 bool Weak) {
180 assert(!InitName.empty() && "Expected init function name");
181 auto *VoidTy = Type::getVoidTy(M.getContext());
182 auto *FnTy = FunctionType::get(VoidTy, InitArgTypes, false);
183 auto FnCallee = M.getOrInsertFunction(InitName, FnTy);
184 auto *Fn = cast<Function>(FnCallee.getCallee());
185 if (Weak && Fn->isDeclaration())
186 Fn->setLinkage(Function::ExternalWeakLinkage);
187 return FnCallee;
188}
189
192 FunctionType::get(Type::getVoidTy(M.getContext()), false),
193 GlobalValue::InternalLinkage, M.getDataLayout().getProgramAddressSpace(),
194 CtorName, &M);
195 Ctor->addFnAttr(Attribute::NoUnwind);
196 setKCFIType(M, *Ctor, "_ZTSFvvE"); // void (*)(void)
197 BasicBlock *CtorBB = BasicBlock::Create(M.getContext(), "", Ctor);
198 ReturnInst::Create(M.getContext(), CtorBB);
199 // Ensure Ctor cannot be discarded, even if in a comdat.
200 appendToUsed(M, {Ctor});
201 return Ctor;
202}
203
204std::pair<Function *, FunctionCallee> llvm::createSanitizerCtorAndInitFunctions(
205 Module &M, StringRef CtorName, StringRef InitName,
206 ArrayRef<Type *> InitArgTypes, ArrayRef<Value *> InitArgs,
207 StringRef VersionCheckName, bool Weak) {
208 assert(!InitName.empty() && "Expected init function name");
209 assert(InitArgs.size() == InitArgTypes.size() &&
210 "Sanitizer's init function expects different number of arguments");
211 FunctionCallee InitFunction =
212 declareSanitizerInitFunction(M, InitName, InitArgTypes, Weak);
213 Function *Ctor = createSanitizerCtor(M, CtorName);
214 IRBuilder<> IRB(M.getContext());
215
216 BasicBlock *RetBB = &Ctor->getEntryBlock();
217 if (Weak) {
218 RetBB->setName("ret");
219 auto *EntryBB = BasicBlock::Create(M.getContext(), "entry", Ctor, RetBB);
220 auto *CallInitBB =
221 BasicBlock::Create(M.getContext(), "callfunc", Ctor, RetBB);
222 auto *InitFn = cast<Function>(InitFunction.getCallee());
223 auto *InitFnPtr =
224 PointerType::get(InitFn->getType(), InitFn->getAddressSpace());
225 IRB.SetInsertPoint(EntryBB);
226 Value *InitNotNull =
227 IRB.CreateICmpNE(InitFn, ConstantPointerNull::get(InitFnPtr));
228 IRB.CreateCondBr(InitNotNull, CallInitBB, RetBB);
229 IRB.SetInsertPoint(CallInitBB);
230 } else {
231 IRB.SetInsertPoint(RetBB->getTerminator());
232 }
233
234 IRB.CreateCall(InitFunction, InitArgs);
235 if (!VersionCheckName.empty()) {
236 FunctionCallee VersionCheckFunction = M.getOrInsertFunction(
237 VersionCheckName, FunctionType::get(IRB.getVoidTy(), {}, false),
238 AttributeList());
239 IRB.CreateCall(VersionCheckFunction, {});
240 }
241
242 if (Weak)
243 IRB.CreateBr(RetBB);
244
245 return std::make_pair(Ctor, InitFunction);
246}
247
248std::pair<Function *, FunctionCallee>
250 Module &M, StringRef CtorName, StringRef InitName,
251 ArrayRef<Type *> InitArgTypes, ArrayRef<Value *> InitArgs,
252 function_ref<void(Function *, FunctionCallee)> FunctionsCreatedCallback,
253 StringRef VersionCheckName, bool Weak) {
254 assert(!CtorName.empty() && "Expected ctor function name");
255
256 if (Function *Ctor = M.getFunction(CtorName))
257 // FIXME: Sink this logic into the module, similar to the handling of
258 // globals. This will make moving to a concurrent model much easier.
259 if (Ctor->arg_empty() ||
260 Ctor->getReturnType() == Type::getVoidTy(M.getContext()))
261 return {Ctor,
262 declareSanitizerInitFunction(M, InitName, InitArgTypes, Weak)};
263
264 Function *Ctor;
265 FunctionCallee InitFunction;
266 std::tie(Ctor, InitFunction) = llvm::createSanitizerCtorAndInitFunctions(
267 M, CtorName, InitName, InitArgTypes, InitArgs, VersionCheckName, Weak);
268 FunctionsCreatedCallback(Ctor, InitFunction);
269 return std::make_pair(Ctor, InitFunction);
270}
271
273 SmallVectorImpl<Function *> &DeadComdatFunctions) {
274 SmallPtrSet<Function *, 32> MaybeDeadFunctions;
275 SmallPtrSet<Comdat *, 32> MaybeDeadComdats;
276 for (Function *F : DeadComdatFunctions) {
277 MaybeDeadFunctions.insert(F);
278 if (Comdat *C = F->getComdat())
279 MaybeDeadComdats.insert(C);
280 }
281
282 // Find comdats for which all users are dead now.
283 SmallPtrSet<Comdat *, 32> DeadComdats;
284 for (Comdat *C : MaybeDeadComdats) {
285 auto IsUserDead = [&](GlobalObject *GO) {
286 auto *F = dyn_cast<Function>(GO);
287 return F && MaybeDeadFunctions.contains(F);
288 };
289 if (all_of(C->getUsers(), IsUserDead))
290 DeadComdats.insert(C);
291 }
292
293 // Only keep functions which have no comdat or a dead comdat.
294 erase_if(DeadComdatFunctions, [&](Function *F) {
295 Comdat *C = F->getComdat();
296 return C && !DeadComdats.contains(C);
297 });
298}
299
301 MD5 Md5;
302 bool ExportsSymbols = false;
303 auto AddGlobal = [&](GlobalValue &GV) {
304 if (GV.isDeclaration() || GV.getName().starts_with("llvm.") ||
305 !GV.hasExternalLinkage() || GV.hasComdat())
306 return;
307 ExportsSymbols = true;
308 Md5.update(GV.getName());
310 };
311
312 for (auto &F : *M)
313 AddGlobal(F);
314 for (auto &GV : M->globals())
315 AddGlobal(GV);
316 for (auto &GA : M->aliases())
317 AddGlobal(GA);
318 for (auto &IF : M->ifuncs())
319 AddGlobal(IF);
320
321 if (!ExportsSymbols)
322 return "";
323
325 Md5.final(R);
326
327 SmallString<32> Str;
328 MD5::stringifyResult(R, Str);
329 return ("." + Str).str();
330}
331
333 StringRef SectionName, Align Alignment) {
334 // Embed the memory buffer into the module.
335 Constant *ModuleConstant = ConstantDataArray::get(
336 M.getContext(), ArrayRef(Buf.getBufferStart(), Buf.getBufferSize()));
338 M, ModuleConstant->getType(), true, GlobalValue::PrivateLinkage,
339 ModuleConstant, "llvm.embedded.object");
341 GV->setAlignment(Alignment);
342
343 LLVMContext &Ctx = M.getContext();
344 NamedMDNode *MD = M.getOrInsertNamedMetadata("llvm.embedded.objects");
345 Metadata *MDVals[] = {ConstantAsMetadata::get(GV),
347
348 MD->addOperand(llvm::MDNode::get(Ctx, MDVals));
349 GV->setMetadata(LLVMContext::MD_exclude, llvm::MDNode::get(Ctx, {}));
350
352}
353
355 Module &M, ArrayRef<GlobalIFunc *> FilteredIFuncsToLower) {
357 ArrayRef<GlobalIFunc *> IFuncsToLower = FilteredIFuncsToLower;
358 if (FilteredIFuncsToLower.empty()) { // Default to lowering all ifuncs
359 for (GlobalIFunc &GI : M.ifuncs())
360 AllIFuncs.push_back(&GI);
361 IFuncsToLower = AllIFuncs;
362 }
363
364 bool UnhandledUsers = false;
365 LLVMContext &Ctx = M.getContext();
366 const DataLayout &DL = M.getDataLayout();
367
368 PointerType *TableEntryTy =
369 PointerType::get(Ctx, DL.getProgramAddressSpace());
370
371 ArrayType *FuncPtrTableTy =
372 ArrayType::get(TableEntryTy, IFuncsToLower.size());
373
374 Align PtrAlign = DL.getABITypeAlign(TableEntryTy);
375
376 // Create a global table of function pointers we'll initialize in a global
377 // constructor.
378 auto *FuncPtrTable = new GlobalVariable(
379 M, FuncPtrTableTy, false, GlobalValue::InternalLinkage,
380 PoisonValue::get(FuncPtrTableTy), "", nullptr,
381 GlobalVariable::NotThreadLocal, DL.getDefaultGlobalsAddressSpace());
382 FuncPtrTable->setAlignment(PtrAlign);
383
384 // Create a function to initialize the function pointer table.
385 Function *NewCtor = Function::Create(
386 FunctionType::get(Type::getVoidTy(Ctx), false), Function::InternalLinkage,
387 DL.getProgramAddressSpace(), "", &M);
388
389 BasicBlock *BB = BasicBlock::Create(Ctx, "", NewCtor);
390 IRBuilder<> InitBuilder(BB);
391
392 size_t TableIndex = 0;
393 for (GlobalIFunc *GI : IFuncsToLower) {
394 Function *ResolvedFunction = GI->getResolverFunction();
395
396 // We don't know what to pass to a resolver function taking arguments
397 //
398 // FIXME: Is this even valid? clang and gcc don't complain but this
399 // probably should be invalid IR. We could just pass through undef.
400 if (!std::empty(ResolvedFunction->getFunctionType()->params())) {
401 LLVM_DEBUG(dbgs() << "Not lowering ifunc resolver function "
402 << ResolvedFunction->getName() << " with parameters\n");
403 UnhandledUsers = true;
404 continue;
405 }
406
407 // Initialize the function pointer table.
408 CallInst *ResolvedFunc = InitBuilder.CreateCall(ResolvedFunction);
409 Value *Casted = InitBuilder.CreatePointerCast(ResolvedFunc, TableEntryTy);
410 Constant *GEP = cast<Constant>(InitBuilder.CreateConstInBoundsGEP2_32(
411 FuncPtrTableTy, FuncPtrTable, 0, TableIndex++));
412 InitBuilder.CreateAlignedStore(Casted, GEP, PtrAlign);
413
414 // Update all users to load a pointer from the global table.
415 for (User *User : make_early_inc_range(GI->users())) {
416 Instruction *UserInst = dyn_cast<Instruction>(User);
417 if (!UserInst) {
418 // TODO: Should handle constantexpr casts in user instructions. Probably
419 // can't do much about constant initializers.
420 UnhandledUsers = true;
421 continue;
422 }
423
424 IRBuilder<> UseBuilder(UserInst);
425 LoadInst *ResolvedTarget =
426 UseBuilder.CreateAlignedLoad(TableEntryTy, GEP, PtrAlign);
427 Value *ResolvedCast =
428 UseBuilder.CreatePointerCast(ResolvedTarget, GI->getType());
429 UserInst->replaceUsesOfWith(GI, ResolvedCast);
430 }
431
432 // If we handled all users, erase the ifunc.
433 if (GI->use_empty())
434 GI->eraseFromParent();
435 }
436
437 InitBuilder.CreateRetVoid();
438
439 PointerType *ConstantDataTy = PointerType::get(Ctx, 0);
440
441 // TODO: Is this the right priority? Probably should be before any other
442 // constructors?
443 const int Priority = 10;
444 appendToGlobalCtors(M, NewCtor, Priority,
445 ConstantPointerNull::get(ConstantDataTy));
446 return UnhandledUsers;
447}
MachineBasicBlock MachineBasicBlock::iterator DebugLoc DL
#define LLVM_DEBUG(X)
Definition: Debug.h:101
std::string Name
Hexagon Common GEP
#define F(x, y, z)
Definition: MD5.cpp:55
static void appendToUsedList(Module &M, StringRef Name, ArrayRef< GlobalValue * > Values)
Definition: ModuleUtils.cpp:91
static void collectUsedGlobals(GlobalVariable *GV, SmallSetVector< Constant *, 16 > &Init)
Definition: ModuleUtils.cpp:81
static void removeFromUsedList(Module &M, StringRef Name, function_ref< bool(Constant *)> ShouldRemove)
static void appendToGlobalArray(StringRef ArrayName, Module &M, Function *F, int Priority, Constant *Data)
Definition: ModuleUtils.cpp:28
Module.h This file contains the declarations for the Module class.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
This file defines the SmallString class.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory),...
Definition: ArrayRef.h:41
size_t size() const
size - Get the array size.
Definition: ArrayRef.h:165
bool empty() const
empty - Check if the array is empty.
Definition: ArrayRef.h:160
Class to represent array types.
Definition: DerivedTypes.h:371
LLVM Basic Block Representation.
Definition: BasicBlock.h:60
static BasicBlock * Create(LLVMContext &Context, const Twine &Name="", Function *Parent=nullptr, BasicBlock *InsertBefore=nullptr)
Creates a new BasicBlock.
Definition: BasicBlock.h:207
const Instruction * getTerminator() const LLVM_READONLY
Returns the terminator instruction if the block is well formed or null if the block is not well forme...
Definition: BasicBlock.h:229
This class represents a function call, abstracting a target machine's calling convention.
static Constant * get(ArrayType *T, ArrayRef< Constant * > V)
Definition: Constants.cpp:1291
static ConstantAsMetadata * get(Constant *C)
Definition: Metadata.h:528
static Constant * get(LLVMContext &Context, ArrayRef< ElementTy > Elts)
get() constructor - Return a constant with array type with an element count and element type matching...
Definition: Constants.h:704
static Constant * getPointerCast(Constant *C, Type *Ty)
Create a BitCast, AddrSpaceCast, or a PtrToInt cast constant expression.
Definition: Constants.cpp:2072
static Constant * getPointerBitCastOrAddrSpaceCast(Constant *C, Type *Ty)
Create a BitCast or AddrSpaceCast for a pointer type depending on the address space.
Definition: Constants.cpp:2087
static ConstantPointerNull * get(PointerType *T)
Static factory methods - Return objects of the specified value.
Definition: Constants.cpp:1775
static Constant * get(StructType *T, ArrayRef< Constant * > V)
Definition: Constants.cpp:1356
This is an important base class in LLVM.
Definition: Constant.h:41
static Constant * getNullValue(Type *Ty)
Constructor to create a '0' constant of arbitrary type.
Definition: Constants.cpp:370
This class represents an Operation in the Expression.
A parsed version of the target data layout string in and methods for querying it.
Definition: DataLayout.h:110
A handy container for a FunctionType+Callee-pointer pair, which can be passed around as a single enti...
Definition: DerivedTypes.h:168
ArrayRef< Type * > params() const
Definition: DerivedTypes.h:130
void addFnAttr(Attribute::AttrKind Kind)
Add function attributes to this function.
Definition: Function.cpp:579
static Function * Create(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace, const Twine &N="", Module *M=nullptr)
Definition: Function.h:162
const BasicBlock & getEntryBlock() const
Definition: Function.h:779
FunctionType * getFunctionType() const
Returns the FunctionType for me.
Definition: Function.h:200
static Function * createWithDefaultAttr(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace, const Twine &N="", Module *M=nullptr)
Creates a function with some attributes recorded in llvm.module.flags applied.
Definition: Function.cpp:359
StringRef getSection() const
Get the custom section of this global if it has one.
Definition: GlobalObject.h:118
void setMetadata(unsigned KindID, MDNode *Node)
Set a particular kind of metadata attachment.
Definition: Metadata.cpp:1485
void setAlignment(Align Align)
Sets the alignment attribute of the GlobalObject.
Definition: Globals.cpp:128
void setSection(StringRef S)
Change the section for this global.
Definition: Globals.cpp:251
ThreadLocalMode getThreadLocalMode() const
Definition: GlobalValue.h:271
unsigned getAddressSpace() const
Definition: GlobalValue.h:205
@ PrivateLinkage
Like Internal, but omit from symbol table.
Definition: GlobalValue.h:60
@ InternalLinkage
Rename collisions when linking (static functions).
Definition: GlobalValue.h:59
@ AppendingLinkage
Special purpose, only applies to global arrays.
Definition: GlobalValue.h:58
Type * getValueType() const
Definition: GlobalValue.h:296
const Constant * getInitializer() const
getInitializer - Return the initializer for this global variable.
bool hasInitializer() const
Definitions have initializers, declarations don't.
void eraseFromParent()
eraseFromParent - This method unlinks 'this' from the containing module and deletes it.
Definition: Globals.cpp:455
LoadInst * CreateAlignedLoad(Type *Ty, Value *Ptr, MaybeAlign Align, const char *Name)
Definition: IRBuilder.h:1806
Value * CreatePointerCast(Value *V, Type *DestTy, const Twine &Name="")
Definition: IRBuilder.h:2153
IntegerType * getInt32Ty()
Fetch the type representing a 32-bit integer.
Definition: IRBuilder.h:520
Value * CreateICmpNE(Value *LHS, Value *RHS, const Twine &Name="")
Definition: IRBuilder.h:2228
ConstantInt * getInt32(uint32_t C)
Get a constant 32-bit value.
Definition: IRBuilder.h:480
BranchInst * CreateCondBr(Value *Cond, BasicBlock *True, BasicBlock *False, MDNode *BranchWeights=nullptr, MDNode *Unpredictable=nullptr)
Create a conditional 'br Cond, TrueDest, FalseDest' instruction.
Definition: IRBuilder.h:1114
ReturnInst * CreateRetVoid()
Create a 'ret void' instruction.
Definition: IRBuilder.h:1084
Value * CreateConstInBoundsGEP2_32(Type *Ty, Value *Ptr, unsigned Idx0, unsigned Idx1, const Twine &Name="")
Definition: IRBuilder.h:1913
PointerType * getPtrTy(unsigned AddrSpace=0)
Fetch the type representing a pointer.
Definition: IRBuilder.h:563
BranchInst * CreateBr(BasicBlock *Dest)
Create an unconditional 'br label X' instruction.
Definition: IRBuilder.h:1108
void SetInsertPoint(BasicBlock *TheBB)
This specifies that created instructions should be appended to the end of the specified block.
Definition: IRBuilder.h:180
Type * getVoidTy()
Fetch the type representing void.
Definition: IRBuilder.h:558
StoreInst * CreateAlignedStore(Value *Val, Value *Ptr, MaybeAlign Align, bool isVolatile=false)
Definition: IRBuilder.h:1825
CallInst * CreateCall(FunctionType *FTy, Value *Callee, ArrayRef< Value * > Args=std::nullopt, const Twine &Name="", MDNode *FPMathTag=nullptr)
Definition: IRBuilder.h:2395
This provides a uniform API for creating instructions and inserting them into a basic block: either a...
Definition: IRBuilder.h:2649
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:67
An instruction for reading from memory.
Definition: Instructions.h:178
Definition: MD5.h:41
void update(ArrayRef< uint8_t > Data)
Updates the hash for the byte stream provided.
Definition: MD5.cpp:189
static void stringifyResult(MD5Result &Result, SmallVectorImpl< char > &Str)
Translates the bytes in Res to a hex string that is deposited into Str.
Definition: MD5.cpp:287
void final(MD5Result &Result)
Finishes off the hash and puts the result in result.
Definition: MD5.cpp:234
ConstantAsMetadata * createConstant(Constant *C)
Return the given constant as metadata.
Definition: MDBuilder.cpp:24
static MDTuple * get(LLVMContext &Context, ArrayRef< Metadata * > MDs)
Definition: Metadata.h:1541
static MDString * get(LLVMContext &Context, StringRef Str)
Definition: Metadata.cpp:597
size_t getBufferSize() const
const char * getBufferStart() const
Root of the metadata hierarchy.
Definition: Metadata.h:62
A Module instance is used to store all the information related to an LLVM module.
Definition: Module.h:65
A tuple of MDNodes.
Definition: Metadata.h:1729
void addOperand(MDNode *M)
Definition: Metadata.cpp:1385
Class to represent pointers.
Definition: DerivedTypes.h:646
static PointerType * getUnqual(Type *ElementType)
This constructs a pointer to an object of the specified type in the default address space (address sp...
Definition: DerivedTypes.h:662
static PoisonValue * get(Type *T)
Static factory methods - Return an 'poison' object of the specified type.
Definition: Constants.cpp:1827
static ReturnInst * Create(LLVMContext &C, Value *retVal=nullptr, Instruction *InsertBefore=nullptr)
std::pair< iterator, bool > insert(PtrType Ptr)
Inserts Ptr if and only if there is no element in the container equal to Ptr.
Definition: SmallPtrSet.h:342
bool contains(ConstPtrType Ptr) const
Definition: SmallPtrSet.h:366
SmallPtrSet - This class implements a set which is optimized for holding SmallSize or less elements.
Definition: SmallPtrSet.h:427
A SetVector that performs no allocations if smaller than a certain size.
Definition: SetVector.h:370
SmallString - A SmallString is just a SmallVector with methods and accessors that make it work better...
Definition: SmallString.h:26
bool empty() const
Definition: SmallVector.h:94
size_t size() const
Definition: SmallVector.h:91
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: SmallVector.h:586
void reserve(size_type N)
Definition: SmallVector.h:676
void push_back(const T &Elt)
Definition: SmallVector.h:426
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
Definition: SmallVector.h:1209
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
constexpr bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:134
Class to represent struct types.
Definition: DerivedTypes.h:216
static StructType * get(LLVMContext &Context, ArrayRef< Type * > Elements, bool isPacked=false)
This static method is the primary way to create a literal StructType.
Definition: Type.cpp:373
unsigned getNumElements() const
Random access to the elements.
Definition: DerivedTypes.h:341
The instances of the Type class are immutable: once they are created, they are never changed.
Definition: Type.h:45
static Type * getVoidTy(LLVMContext &C)
static IntegerType * getInt32Ty(LLVMContext &C)
A Use represents the edge between a Value definition and its users.
Definition: Use.h:43
bool replaceUsesOfWith(Value *From, Value *To)
Replace uses of one Value with another.
Definition: User.cpp:21
LLVM Value Representation.
Definition: Value.h:74
Type * getType() const
All values are typed, get the type of this value.
Definition: Value.h:255
void setName(const Twine &Name)
Change the name of the value.
Definition: Value.cpp:377
StringRef getName() const
Return a constant reference to the value's name.
Definition: Value.cpp:309
void takeName(Value *V)
Transfer the name from V to this value.
Definition: Value.cpp:383
An efficient, type-erasing, non-owning reference to a callable.
@ C
The default llvm calling convention, compatible with C.
Definition: CallingConv.h:34
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ Offset
Definition: DWP.cpp:456
bool all_of(R &&range, UnaryPredicate P)
Provide wrappers to std::all_of which take ranges instead of having to pass begin/end explicitly.
Definition: STLExtras.h:1731
Function * createSanitizerCtor(Module &M, StringRef CtorName)
Creates sanitizer constructor function.
iterator_range< early_inc_iterator_impl< detail::IterOfRange< RangeT > > > make_early_inc_range(RangeT &&Range)
Make a range that does early increment to allow mutation of the underlying range without disrupting i...
Definition: STLExtras.h:665
FunctionCallee declareSanitizerInitFunction(Module &M, StringRef InitName, ArrayRef< Type * > InitArgTypes, bool Weak=false)
std::string getUniqueModuleId(Module *M)
Produce a unique identifier for this module by taking the MD5 sum of the names of the module's strong...
std::pair< Function *, FunctionCallee > getOrCreateSanitizerCtorAndInitFunctions(Module &M, StringRef CtorName, StringRef InitName, ArrayRef< Type * > InitArgTypes, ArrayRef< Value * > InitArgs, function_ref< void(Function *, FunctionCallee)> FunctionsCreatedCallback, StringRef VersionCheckName=StringRef(), bool Weak=false)
Creates sanitizer constructor function lazily.
std::pair< Function *, FunctionCallee > createSanitizerCtorAndInitFunctions(Module &M, StringRef CtorName, StringRef InitName, ArrayRef< Type * > InitArgTypes, ArrayRef< Value * > InitArgs, StringRef VersionCheckName=StringRef(), bool Weak=false)
Creates sanitizer constructor function, and calls sanitizer's init function from it.
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:163
void removeFromUsedLists(Module &M, function_ref< bool(Constant *)> ShouldRemove)
Removes global values from the llvm.used and llvm.compiler.used arrays.
void appendToCompilerUsed(Module &M, ArrayRef< GlobalValue * > Values)
Adds global values to the llvm.compiler.used list.
void appendToGlobalCtors(Module &M, Function *F, int Priority, Constant *Data=nullptr)
Append F to the list of global ctors of module M with the given Priority.
Definition: ModuleUtils.cpp:73
void setKCFIType(Module &M, Function &F, StringRef MangledType)
Sets the KCFI type for the function.
void erase_if(Container &C, UnaryPredicate P)
Provide a container algorithm similar to C++ Library Fundamentals v2's erase_if which is equivalent t...
Definition: STLExtras.h:2031
void filterDeadComdatFunctions(SmallVectorImpl< Function * > &DeadComdatFunctions)
Filter out potentially dead comdat functions where other entries keep the entire comdat group alive.
void embedBufferInModule(Module &M, MemoryBufferRef Buf, StringRef SectionName, Align Alignment=Align(1))
Embed the memory buffer Buf into the module M as a global using the specified section name.
bool lowerGlobalIFuncUsersAsGlobalCtor(Module &M, ArrayRef< GlobalIFunc * > IFuncsToLower={})
Lower all calls to ifuncs by replacing uses with indirect calls loaded out of a global table initiali...
void appendToUsed(Module &M, ArrayRef< GlobalValue * > Values)
Adds global values to the llvm.used list.
void appendToGlobalDtors(Module &M, Function *F, int Priority, Constant *Data=nullptr)
Same as appendToGlobalCtors(), but for global dtors.
Definition: ModuleUtils.cpp:77
uint64_t xxHash64(llvm::StringRef Data)
Definition: xxhash.cpp:87
This struct is a compact representation of a valid (non-zero power of two) alignment.
Definition: Alignment.h:39