LLVM 20.0.0git
YAMLRemarkParser.cpp
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1//===- YAMLRemarkParser.cpp -----------------------------------------------===//
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 provides utility methods used by clients that want to use the
10// parser for remark diagnostics in LLVM.
11//
12//===----------------------------------------------------------------------===//
13
14#include "YAMLRemarkParser.h"
17#include "llvm/Support/Endian.h"
18#include "llvm/Support/Path.h"
19#include <optional>
20
21using namespace llvm;
22using namespace llvm::remarks;
23
24char YAMLParseError::ID = 0;
25
26static void handleDiagnostic(const SMDiagnostic &Diag, void *Ctx) {
27 assert(Ctx && "Expected non-null Ctx in diagnostic handler.");
28 std::string &Message = *static_cast<std::string *>(Ctx);
29 assert(Message.empty() && "Expected an empty string.");
30 raw_string_ostream OS(Message);
31 Diag.print(/*ProgName=*/nullptr, OS, /*ShowColors*/ false,
32 /*ShowKindLabels*/ true);
33 OS << '\n';
34 OS.flush();
35}
36
38 yaml::Stream &Stream, yaml::Node &Node) {
39 // 1) Set up a diagnostic handler to avoid errors being printed out to
40 // stderr.
41 // 2) Use the stream to print the error with the associated node.
42 // 3) The stream will use the source manager to print the error, which will
43 // call the diagnostic handler.
44 // 4) The diagnostic handler will stream the error directly into this object's
45 // Message member, which is used when logging is asked for.
46 auto OldDiagHandler = SM.getDiagHandler();
47 auto OldDiagCtx = SM.getDiagContext();
48 SM.setDiagHandler(handleDiagnostic, &Message);
49 Stream.printError(&Node, Twine(Msg) + Twine('\n'));
50 // Restore the old handlers.
51 SM.setDiagHandler(OldDiagHandler, OldDiagCtx);
52}
53
54static SourceMgr setupSM(std::string &LastErrorMessage) {
55 SourceMgr SM;
56 SM.setDiagHandler(handleDiagnostic, &LastErrorMessage);
57 return SM;
58}
59
60// Parse the magic number. This function returns true if this represents remark
61// metadata, false otherwise.
64 return false;
65
66 if (Buf.size() < 1 || !Buf.consume_front(StringRef("\0", 1)))
67 return createStringError(std::errc::illegal_byte_sequence,
68 "Expecting \\0 after magic number.");
69 return true;
70}
71
73 if (Buf.size() < sizeof(uint64_t))
74 return createStringError(std::errc::illegal_byte_sequence,
75 "Expecting version number.");
76
78 support::endian::read<uint64_t, llvm::endianness::little>(Buf.data());
80 return createStringError(std::errc::illegal_byte_sequence,
81 "Mismatching remark version. Got %" PRId64
82 ", expected %" PRId64 ".",
84 Buf = Buf.drop_front(sizeof(uint64_t));
85 return Version;
86}
87
89 if (Buf.size() < sizeof(uint64_t))
90 return createStringError(std::errc::illegal_byte_sequence,
91 "Expecting string table size.");
92 uint64_t StrTabSize =
93 support::endian::read<uint64_t, llvm::endianness::little>(Buf.data());
94 Buf = Buf.drop_front(sizeof(uint64_t));
95 return StrTabSize;
96}
97
99 uint64_t StrTabSize) {
100 if (Buf.size() < StrTabSize)
101 return createStringError(std::errc::illegal_byte_sequence,
102 "Expecting string table.");
103
104 // Attach the string table to the parser.
105 ParsedStringTable Result(StringRef(Buf.data(), StrTabSize));
106 Buf = Buf.drop_front(StrTabSize);
107 return Expected<ParsedStringTable>(std::move(Result));
108}
109
111 StringRef Buf, std::optional<ParsedStringTable> StrTab,
112 std::optional<StringRef> ExternalFilePrependPath) {
113 // We now have a magic number. The metadata has to be correct.
114 Expected<bool> isMeta = parseMagic(Buf);
115 if (!isMeta)
116 return isMeta.takeError();
117 // If it's not recognized as metadata, roll back.
118 std::unique_ptr<MemoryBuffer> SeparateBuf;
119 if (*isMeta) {
121 if (!Version)
122 return Version.takeError();
123
124 Expected<uint64_t> StrTabSize = parseStrTabSize(Buf);
125 if (!StrTabSize)
126 return StrTabSize.takeError();
127
128 // If the size of string table is not 0, try to build one.
129 if (*StrTabSize != 0) {
130 if (StrTab)
131 return createStringError(std::errc::illegal_byte_sequence,
132 "String table already provided.");
133 Expected<ParsedStringTable> MaybeStrTab = parseStrTab(Buf, *StrTabSize);
134 if (!MaybeStrTab)
135 return MaybeStrTab.takeError();
136 StrTab = std::move(*MaybeStrTab);
137 }
138 // If it starts with "---", there is no external file.
139 if (!Buf.starts_with("---")) {
140 // At this point, we expect Buf to contain the external file path.
141 StringRef ExternalFilePath = Buf;
142 SmallString<80> FullPath;
143 if (ExternalFilePrependPath)
144 FullPath = *ExternalFilePrependPath;
145 sys::path::append(FullPath, ExternalFilePath);
146
147 // Try to open the file and start parsing from there.
149 MemoryBuffer::getFile(FullPath);
150 if (std::error_code EC = BufferOrErr.getError())
151 return createFileError(FullPath, EC);
152
153 // Keep the buffer alive.
154 SeparateBuf = std::move(*BufferOrErr);
155 Buf = SeparateBuf->getBuffer();
156 }
157 }
158
159 std::unique_ptr<YAMLRemarkParser> Result =
160 StrTab
161 ? std::make_unique<YAMLStrTabRemarkParser>(Buf, std::move(*StrTab))
162 : std::make_unique<YAMLRemarkParser>(Buf);
163 if (SeparateBuf)
164 Result->SeparateBuf = std::move(SeparateBuf);
165 return std::move(Result);
166}
167
169 : YAMLRemarkParser(Buf, std::nullopt) {}
170
172 std::optional<ParsedStringTable> StrTab)
173 : RemarkParser{Format::YAML}, StrTab(std::move(StrTab)),
174 SM(setupSM(LastErrorMessage)), Stream(Buf, SM), YAMLIt(Stream.begin()) {}
175
177 return make_error<YAMLParseError>(Message, SM, Stream, Node);
178}
179
181 if (LastErrorMessage.empty())
182 return Error::success();
183 Error E = make_error<YAMLParseError>(LastErrorMessage);
184 LastErrorMessage.clear();
185 return E;
186}
187
190 if (Error E = error())
191 return std::move(E);
192
193 yaml::Node *YAMLRoot = RemarkEntry.getRoot();
194 if (!YAMLRoot) {
195 return createStringError(std::make_error_code(std::errc::invalid_argument),
196 "not a valid YAML file.");
197 }
198
199 auto *Root = dyn_cast<yaml::MappingNode>(YAMLRoot);
200 if (!Root)
201 return error("document root is not of mapping type.", *YAMLRoot);
202
203 std::unique_ptr<Remark> Result = std::make_unique<Remark>();
204 Remark &TheRemark = *Result;
205
206 // First, the type. It needs special handling since is not part of the
207 // key-value stream.
208 Expected<Type> T = parseType(*Root);
209 if (!T)
210 return T.takeError();
211 else
212 TheRemark.RemarkType = *T;
213
214 // Then, parse the fields, one by one.
215 for (yaml::KeyValueNode &RemarkField : *Root) {
216 Expected<StringRef> MaybeKey = parseKey(RemarkField);
217 if (!MaybeKey)
218 return MaybeKey.takeError();
219 StringRef KeyName = *MaybeKey;
220
221 if (KeyName == "Pass") {
222 if (Expected<StringRef> MaybeStr = parseStr(RemarkField))
223 TheRemark.PassName = *MaybeStr;
224 else
225 return MaybeStr.takeError();
226 } else if (KeyName == "Name") {
227 if (Expected<StringRef> MaybeStr = parseStr(RemarkField))
228 TheRemark.RemarkName = *MaybeStr;
229 else
230 return MaybeStr.takeError();
231 } else if (KeyName == "Function") {
232 if (Expected<StringRef> MaybeStr = parseStr(RemarkField))
233 TheRemark.FunctionName = *MaybeStr;
234 else
235 return MaybeStr.takeError();
236 } else if (KeyName == "Hotness") {
237 if (Expected<unsigned> MaybeU = parseUnsigned(RemarkField))
238 TheRemark.Hotness = *MaybeU;
239 else
240 return MaybeU.takeError();
241 } else if (KeyName == "DebugLoc") {
242 if (Expected<RemarkLocation> MaybeLoc = parseDebugLoc(RemarkField))
243 TheRemark.Loc = *MaybeLoc;
244 else
245 return MaybeLoc.takeError();
246 } else if (KeyName == "Args") {
247 auto *Args = dyn_cast<yaml::SequenceNode>(RemarkField.getValue());
248 if (!Args)
249 return error("wrong value type for key.", RemarkField);
250
251 for (yaml::Node &Arg : *Args) {
252 if (Expected<Argument> MaybeArg = parseArg(Arg))
253 TheRemark.Args.push_back(*MaybeArg);
254 else
255 return MaybeArg.takeError();
256 }
257 } else {
258 return error("unknown key.", RemarkField);
259 }
260 }
261
262 // Check if any of the mandatory fields are missing.
263 if (TheRemark.RemarkType == Type::Unknown || TheRemark.PassName.empty() ||
264 TheRemark.RemarkName.empty() || TheRemark.FunctionName.empty())
265 return error("Type, Pass, Name or Function missing.",
266 *RemarkEntry.getRoot());
267
268 return std::move(Result);
269}
270
272 auto Type = StringSwitch<remarks::Type>(Node.getRawTag())
273 .Case("!Passed", remarks::Type::Passed)
274 .Case("!Missed", remarks::Type::Missed)
275 .Case("!Analysis", remarks::Type::Analysis)
276 .Case("!AnalysisFPCommute", remarks::Type::AnalysisFPCommute)
277 .Case("!AnalysisAliasing", remarks::Type::AnalysisAliasing)
278 .Case("!Failure", remarks::Type::Failure)
281 return error("expected a remark tag.", Node);
282 return Type;
283}
284
286 if (auto *Key = dyn_cast<yaml::ScalarNode>(Node.getKey()))
287 return Key->getRawValue();
288
289 return error("key is not a string.", Node);
290}
291
293 auto *Value = dyn_cast<yaml::ScalarNode>(Node.getValue());
294 yaml::BlockScalarNode *ValueBlock;
295 StringRef Result;
296 if (!Value) {
297 // Try to parse the value as a block node.
298 ValueBlock = dyn_cast<yaml::BlockScalarNode>(Node.getValue());
299 if (!ValueBlock)
300 return error("expected a value of scalar type.", Node);
301 Result = ValueBlock->getValue();
302 } else
303 Result = Value->getRawValue();
304
305 Result.consume_front("\'");
306 Result.consume_back("\'");
307
308 return Result;
309}
310
313 auto *Value = dyn_cast<yaml::ScalarNode>(Node.getValue());
314 if (!Value)
315 return error("expected a value of scalar type.", Node);
316 unsigned UnsignedValue = 0;
317 if (Value->getValue(Tmp).getAsInteger(10, UnsignedValue))
318 return error("expected a value of integer type.", *Value);
319 return UnsignedValue;
320}
321
324 auto *DebugLoc = dyn_cast<yaml::MappingNode>(Node.getValue());
325 if (!DebugLoc)
326 return error("expected a value of mapping type.", Node);
327
328 std::optional<StringRef> File;
329 std::optional<unsigned> Line;
330 std::optional<unsigned> Column;
331
332 for (yaml::KeyValueNode &DLNode : *DebugLoc) {
333 Expected<StringRef> MaybeKey = parseKey(DLNode);
334 if (!MaybeKey)
335 return MaybeKey.takeError();
336 StringRef KeyName = *MaybeKey;
337
338 if (KeyName == "File") {
339 if (Expected<StringRef> MaybeStr = parseStr(DLNode))
340 File = *MaybeStr;
341 else
342 return MaybeStr.takeError();
343 } else if (KeyName == "Column") {
344 if (Expected<unsigned> MaybeU = parseUnsigned(DLNode))
345 Column = *MaybeU;
346 else
347 return MaybeU.takeError();
348 } else if (KeyName == "Line") {
349 if (Expected<unsigned> MaybeU = parseUnsigned(DLNode))
350 Line = *MaybeU;
351 else
352 return MaybeU.takeError();
353 } else {
354 return error("unknown entry in DebugLoc map.", DLNode);
355 }
356 }
357
358 // If any of the debug loc fields is missing, return an error.
359 if (!File || !Line || !Column)
360 return error("DebugLoc node incomplete.", Node);
361
362 return RemarkLocation{*File, *Line, *Column};
363}
364
366 auto *ArgMap = dyn_cast<yaml::MappingNode>(&Node);
367 if (!ArgMap)
368 return error("expected a value of mapping type.", Node);
369
370 std::optional<StringRef> KeyStr;
371 std::optional<StringRef> ValueStr;
372 std::optional<RemarkLocation> Loc;
373
374 for (yaml::KeyValueNode &ArgEntry : *ArgMap) {
375 Expected<StringRef> MaybeKey = parseKey(ArgEntry);
376 if (!MaybeKey)
377 return MaybeKey.takeError();
378 StringRef KeyName = *MaybeKey;
379
380 // Try to parse debug locs.
381 if (KeyName == "DebugLoc") {
382 // Can't have multiple DebugLoc entries per argument.
383 if (Loc)
384 return error("only one DebugLoc entry is allowed per argument.",
385 ArgEntry);
386
387 if (Expected<RemarkLocation> MaybeLoc = parseDebugLoc(ArgEntry)) {
388 Loc = *MaybeLoc;
389 continue;
390 } else
391 return MaybeLoc.takeError();
392 }
393
394 // If we already have a string, error out.
395 if (ValueStr)
396 return error("only one string entry is allowed per argument.", ArgEntry);
397
398 // Try to parse the value.
399 if (Expected<StringRef> MaybeStr = parseStr(ArgEntry))
400 ValueStr = *MaybeStr;
401 else
402 return MaybeStr.takeError();
403
404 // Keep the key from the string.
405 KeyStr = KeyName;
406 }
407
408 if (!KeyStr)
409 return error("argument key is missing.", *ArgMap);
410 if (!ValueStr)
411 return error("argument value is missing.", *ArgMap);
412
413 return Argument{*KeyStr, *ValueStr, Loc};
414}
415
417 if (YAMLIt == Stream.end())
418 return make_error<EndOfFileError>();
419
421 if (!MaybeResult) {
422 // Avoid garbage input, set the iterator to the end.
423 YAMLIt = Stream.end();
424 return MaybeResult.takeError();
425 }
426
427 ++YAMLIt;
428
429 return std::move(*MaybeResult);
430}
431
433 auto *Value = dyn_cast<yaml::ScalarNode>(Node.getValue());
434 yaml::BlockScalarNode *ValueBlock;
435 StringRef Result;
436 if (!Value) {
437 // Try to parse the value as a block node.
438 ValueBlock = dyn_cast<yaml::BlockScalarNode>(Node.getValue());
439 if (!ValueBlock)
440 return error("expected a value of scalar type.", Node);
441 Result = ValueBlock->getValue();
442 } else
443 Result = Value->getRawValue();
444 // If we have a string table, parse it as an unsigned.
445 unsigned StrID = 0;
446 if (Expected<unsigned> MaybeStrID = parseUnsigned(Node))
447 StrID = *MaybeStrID;
448 else
449 return MaybeStrID.takeError();
450
451 if (Expected<StringRef> Str = (*StrTab)[StrID])
452 Result = *Str;
453 else
454 return Str.takeError();
455
456 Result.consume_front("\'");
457 Result.consume_back("\'");
458
459 return Result;
460}
static Version parseVersion(StringRef Name)
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
raw_pwrite_stream & OS
This file defines the SmallString class.
This file implements the StringSwitch template, which mimics a switch() statement whose cases are str...
static SourceMgr setupSM(std::string &LastErrorMessage)
static Expected< ParsedStringTable > parseStrTab(StringRef &Buf, uint64_t StrTabSize)
static Expected< uint64_t > parseStrTabSize(StringRef &Buf)
static void handleDiagnostic(const SMDiagnostic &Diag, void *Ctx)
static Expected< bool > parseMagic(StringRef &Buf)
A debug info location.
Definition: DebugLoc.h:33
Represents either an error or a value T.
Definition: ErrorOr.h:56
std::error_code getError() const
Definition: ErrorOr.h:152
Lightweight error class with error context and mandatory checking.
Definition: Error.h:160
static ErrorSuccess success()
Create a success value.
Definition: Error.h:337
Tagged union holding either a T or a Error.
Definition: Error.h:481
Error takeError()
Take ownership of the stored error.
Definition: Error.h:608
static ErrorOr< std::unique_ptr< MemoryBuffer > > getFile(const Twine &Filename, bool IsText=false, bool RequiresNullTerminator=true, bool IsVolatile=false, std::optional< Align > Alignment=std::nullopt)
Open the specified file as a MemoryBuffer, returning a new MemoryBuffer if successful,...
Instances of this class encapsulate one diagnostic report, allowing printing to a raw_ostream as a ca...
Definition: SourceMgr.h:281
void print(const char *ProgName, raw_ostream &S, bool ShowColors=true, bool ShowKindLabel=true, bool ShowLocation=true) const
Definition: SourceMgr.cpp:484
SmallString - A SmallString is just a SmallVector with methods and accessors that make it work better...
Definition: SmallString.h:26
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
Definition: SmallVector.h:1210
This owns the files read by a parser, handles include stacks, and handles diagnostic wrangling.
Definition: SourceMgr.h:31
void * getDiagContext() const
Definition: SourceMgr.h:118
DiagHandlerTy getDiagHandler() const
Definition: SourceMgr.h:117
void setDiagHandler(DiagHandlerTy DH, void *Ctx=nullptr)
Specify a diagnostic handler to be invoked every time PrintMessage is called.
Definition: SourceMgr.h:112
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
bool starts_with(StringRef Prefix) const
Check if this string starts with the given Prefix.
Definition: StringRef.h:250
constexpr bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:134
StringRef drop_front(size_t N=1) const
Return a StringRef equal to 'this' but with the first N elements dropped.
Definition: StringRef.h:594
constexpr size_t size() const
size - Get the string size.
Definition: StringRef.h:137
constexpr const char * data() const
data - Get a pointer to the start of the string (which may not be null terminated).
Definition: StringRef.h:131
bool consume_front(StringRef Prefix)
Returns true if this StringRef has the given prefix and removes that prefix.
Definition: StringRef.h:620
A switch()-like statement whose cases are string literals.
Definition: StringSwitch.h:44
StringSwitch & Case(StringLiteral S, T Value)
Definition: StringSwitch.h:69
R Default(T Value)
Definition: StringSwitch.h:182
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
LLVM Value Representation.
Definition: Value.h:74
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:661
YAMLParseError(StringRef Message, SourceMgr &SM, yaml::Stream &Stream, yaml::Node &Node)
A block scalar node is an opaque datum that can be presented as a series of zero or more Unicode scal...
Definition: YAMLParser.h:260
StringRef getValue() const
Gets the value of this node as a StringRef.
Definition: YAMLParser.h:273
A YAML Stream is a sequence of Documents.
Definition: YAMLParser.h:536
Node * getRoot()
Parse and return the root level node.
Definition: YAMLParser.h:548
A key and value pair.
Definition: YAMLParser.h:290
Represents a YAML map created from either a block map for a flow map.
Definition: YAMLParser.h:419
Abstract base class for all Nodes.
Definition: YAMLParser.h:119
This class represents a YAML stream potentially containing multiple documents.
Definition: YAMLParser.h:86
document_iterator end()
void printError(Node *N, const Twine &Msg, SourceMgr::DiagKind Kind=SourceMgr::DK_Error)
constexpr StringLiteral Magic("REMARKS")
Format
The format used for serializing/deserializing remarks.
Definition: RemarkFormat.h:25
constexpr uint64_t CurrentRemarkVersion
The current version of the remark entry.
Definition: Remark.h:28
Expected< std::unique_ptr< YAMLRemarkParser > > createYAMLParserFromMeta(StringRef Buf, std::optional< ParsedStringTable > StrTab=std::nullopt, std::optional< StringRef > ExternalFilePrependPath=std::nullopt)
Type
The type of the remark.
Definition: Remark.h:65
void append(SmallVectorImpl< char > &path, const Twine &a, const Twine &b="", const Twine &c="", const Twine &d="")
Append to path.
Definition: Path.cpp:457
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
Error createFileError(const Twine &F, Error E)
Concatenate a source file path and/or name with an Error.
Definition: Error.h:1380
Error createStringError(std::error_code EC, char const *Fmt, const Ts &... Vals)
Create formatted StringError object.
Definition: Error.h:1286
OutputIt move(R &&Range, OutputIt Out)
Provide wrappers to std::move which take ranges instead of having to pass begin/end explicitly.
Definition: STLExtras.h:1849
Implement std::hash so that hash_code can be used in STL containers.
Definition: BitVector.h:858
A key-value pair with a debug location that is used to display the remarks at the right place in the ...
Definition: Remark.h:46
In-memory representation of the string table parsed from a buffer (e.g.
Definition: RemarkParser.h:60
The debug location used to track a remark back to the source file.
Definition: Remark.h:31
Parser used to parse a raw buffer to remarks::Remark objects.
Definition: RemarkParser.h:40
A remark type used for both emission and parsing.
Definition: Remark.h:97
Type RemarkType
The type of the remark.
Definition: Remark.h:99
StringRef PassName
Name of the pass that triggers the emission of this remark.
Definition: Remark.h:102
std::optional< RemarkLocation > Loc
The location in the source file of the remark.
Definition: Remark.h:113
std::optional< uint64_t > Hotness
If profile information is available, this is the number of times the corresponding code was executed ...
Definition: Remark.h:117
StringRef RemarkName
Textual identifier for the remark (single-word, camel-case).
Definition: Remark.h:107
StringRef FunctionName
Mangled name of the function that triggers the emssion of this remark.
Definition: Remark.h:110
SmallVector< Argument, 5 > Args
Arguments collected via the streaming interface.
Definition: Remark.h:120
Regular YAML to Remark parser.
yaml::document_iterator YAMLIt
Iterator in the YAML stream.
Error error()
Create a YAMLParseError error from an existing error generated by the YAML parser.
Expected< unsigned > parseUnsigned(yaml::KeyValueNode &Node)
Parse one value to an unsigned.
yaml::Stream Stream
Stream for yaml parsing.
std::optional< ParsedStringTable > StrTab
The string table used for parsing strings.
Expected< RemarkLocation > parseDebugLoc(yaml::KeyValueNode &Node)
Parse a debug location.
virtual Expected< StringRef > parseStr(yaml::KeyValueNode &Node)
Parse one value to a string.
Expected< StringRef > parseKey(yaml::KeyValueNode &Node)
Parse one key to a string.
Expected< Argument > parseArg(yaml::Node &Node)
Parse an argument.
Expected< std::unique_ptr< Remark > > parseRemark(yaml::Document &Remark)
Parse a YAML remark to a remarks::Remark object.
Expected< std::unique_ptr< Remark > > next() override
If no error occurs, this returns a valid Remark object.
SourceMgr SM
Source manager for better error messages.
std::string LastErrorMessage
Last error message that can come from the YAML parser diagnostics.
Expected< Type > parseType(yaml::MappingNode &Node)
Parse the type of a remark to an enum type.
Expected< StringRef > parseStr(yaml::KeyValueNode &Node) override
Parse one value to a string.