1 //===--- Preprocessor.h - C Language Family Preprocessor --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Defines the clang::Preprocessor interface.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_LEX_PREPROCESSOR_H
16 #define LLVM_CLANG_LEX_PREPROCESSOR_H
18 #include "clang/Basic/Builtins.h"
19 #include "clang/Basic/Diagnostic.h"
20 #include "clang/Basic/IdentifierTable.h"
21 #include "clang/Basic/SourceLocation.h"
22 #include "clang/Lex/Lexer.h"
23 #include "clang/Lex/MacroInfo.h"
24 #include "clang/Lex/ModuleMap.h"
25 #include "clang/Lex/PPCallbacks.h"
26 #include "clang/Lex/PTHLexer.h"
27 #include "clang/Lex/PTHManager.h"
28 #include "clang/Lex/TokenLexer.h"
29 #include "llvm/ADT/ArrayRef.h"
30 #include "llvm/ADT/DenseMap.h"
31 #include "llvm/ADT/IntrusiveRefCntPtr.h"
32 #include "llvm/ADT/SmallPtrSet.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/TinyPtrVector.h"
35 #include "llvm/Support/Allocator.h"
40 template<unsigned InternalLen> class SmallString;
46 class ExternalPreprocessorSource;
50 class PragmaNamespace;
56 class CodeCompletionHandler;
57 class DirectoryLookup;
58 class PreprocessingRecord;
60 class PreprocessorOptions;
62 /// \brief Stores token information for comparing actual tokens with
63 /// predefined values. Only handles simple tokens and identifiers.
69 TokenValue(tok::TokenKind Kind) : Kind(Kind), II(nullptr) {
70 assert(Kind != tok::raw_identifier && "Raw identifiers are not supported.");
71 assert(Kind != tok::identifier &&
72 "Identifiers should be created by TokenValue(IdentifierInfo *)");
73 assert(!tok::isLiteral(Kind) && "Literals are not supported.");
74 assert(!tok::isAnnotation(Kind) && "Annotations are not supported.");
76 TokenValue(IdentifierInfo *II) : Kind(tok::identifier), II(II) {}
77 bool operator==(const Token &Tok) const {
78 return Tok.getKind() == Kind &&
79 (!II || II == Tok.getIdentifierInfo());
83 /// \brief Context in which macro name is used.
85 MU_Other = 0, // other than #define or #undef
86 MU_Define = 1, // macro name specified in #define
87 MU_Undef = 2 // macro name specified in #undef
90 /// \brief Engages in a tight little dance with the lexer to efficiently
91 /// preprocess tokens.
93 /// Lexers know only about tokens within a single source file, and don't
94 /// know anything about preprocessor-level issues like the \#include stack,
95 /// token expansion, etc.
96 class Preprocessor : public RefCountedBase<Preprocessor> {
97 IntrusiveRefCntPtr<PreprocessorOptions> PPOpts;
98 DiagnosticsEngine *Diags;
99 LangOptions &LangOpts;
100 const TargetInfo *Target;
101 FileManager &FileMgr;
102 SourceManager &SourceMgr;
103 std::unique_ptr<ScratchBuffer> ScratchBuf;
104 HeaderSearch &HeaderInfo;
105 ModuleLoader &TheModuleLoader;
107 /// \brief External source of macros.
108 ExternalPreprocessorSource *ExternalSource;
111 /// An optional PTHManager object used for getting tokens from
112 /// a token cache rather than lexing the original source file.
113 std::unique_ptr<PTHManager> PTH;
115 /// A BumpPtrAllocator object used to quickly allocate and release
116 /// objects internal to the Preprocessor.
117 llvm::BumpPtrAllocator BP;
119 /// Identifiers for builtin macros and other builtins.
120 IdentifierInfo *Ident__LINE__, *Ident__FILE__; // __LINE__, __FILE__
121 IdentifierInfo *Ident__DATE__, *Ident__TIME__; // __DATE__, __TIME__
122 IdentifierInfo *Ident__INCLUDE_LEVEL__; // __INCLUDE_LEVEL__
123 IdentifierInfo *Ident__BASE_FILE__; // __BASE_FILE__
124 IdentifierInfo *Ident__TIMESTAMP__; // __TIMESTAMP__
125 IdentifierInfo *Ident__COUNTER__; // __COUNTER__
126 IdentifierInfo *Ident_Pragma, *Ident__pragma; // _Pragma, __pragma
127 IdentifierInfo *Ident__identifier; // __identifier
128 IdentifierInfo *Ident__VA_ARGS__; // __VA_ARGS__
129 IdentifierInfo *Ident__has_feature; // __has_feature
130 IdentifierInfo *Ident__has_extension; // __has_extension
131 IdentifierInfo *Ident__has_builtin; // __has_builtin
132 IdentifierInfo *Ident__has_attribute; // __has_attribute
133 IdentifierInfo *Ident__has_include; // __has_include
134 IdentifierInfo *Ident__has_include_next; // __has_include_next
135 IdentifierInfo *Ident__has_warning; // __has_warning
136 IdentifierInfo *Ident__is_identifier; // __is_identifier
137 IdentifierInfo *Ident__building_module; // __building_module
138 IdentifierInfo *Ident__MODULE__; // __MODULE__
139 IdentifierInfo *Ident__has_cpp_attribute; // __has_cpp_attribute
140 IdentifierInfo *Ident__has_declspec; // __has_declspec_attribute
142 SourceLocation DATELoc, TIMELoc;
143 unsigned CounterValue; // Next __COUNTER__ value.
146 /// \brief Maximum depth of \#includes.
147 MaxAllowedIncludeStackDepth = 200
150 // State that is set before the preprocessor begins.
151 bool KeepComments : 1;
152 bool KeepMacroComments : 1;
153 bool SuppressIncludeNotFoundError : 1;
155 // State that changes while the preprocessor runs:
156 bool InMacroArgs : 1; // True if parsing fn macro invocation args.
158 /// Whether the preprocessor owns the header search object.
159 bool OwnsHeaderSearch : 1;
161 /// True if macro expansion is disabled.
162 bool DisableMacroExpansion : 1;
164 /// Temporarily disables DisableMacroExpansion (i.e. enables expansion)
165 /// when parsing preprocessor directives.
166 bool MacroExpansionInDirectivesOverride : 1;
168 class ResetMacroExpansionHelper;
170 /// \brief Whether we have already loaded macros from the external source.
171 mutable bool ReadMacrosFromExternalSource : 1;
173 /// \brief True if pragmas are enabled.
174 bool PragmasEnabled : 1;
176 /// \brief True if the current build action is a preprocessing action.
177 bool PreprocessedOutput : 1;
179 /// \brief True if we are currently preprocessing a #if or #elif directive
180 bool ParsingIfOrElifDirective;
182 /// \brief True if we are pre-expanding macro arguments.
183 bool InMacroArgPreExpansion;
185 /// \brief Mapping/lookup information for all identifiers in
186 /// the program, including program keywords.
187 mutable IdentifierTable Identifiers;
189 /// \brief This table contains all the selectors in the program.
191 /// Unlike IdentifierTable above, this table *isn't* populated by the
192 /// preprocessor. It is declared/expanded here because its role/lifetime is
193 /// conceptually similar to the IdentifierTable. In addition, the current
194 /// control flow (in clang::ParseAST()), make it convenient to put here.
196 /// FIXME: Make sure the lifetime of Identifiers/Selectors *isn't* tied to
197 /// the lifetime of the preprocessor.
198 SelectorTable Selectors;
200 /// \brief Information about builtins.
201 Builtin::Context BuiltinInfo;
203 /// \brief Tracks all of the pragmas that the client registered
204 /// with this preprocessor.
205 std::unique_ptr<PragmaNamespace> PragmaHandlers;
207 /// \brief Pragma handlers of the original source is stored here during the
208 /// parsing of a model file.
209 std::unique_ptr<PragmaNamespace> PragmaHandlersBackup;
211 /// \brief Tracks all of the comment handlers that the client registered
212 /// with this preprocessor.
213 std::vector<CommentHandler *> CommentHandlers;
215 /// \brief True if we want to ignore EOF token and continue later on (thus
216 /// avoid tearing the Lexer and etc. down).
217 bool IncrementalProcessing;
219 /// The kind of translation unit we are processing.
220 TranslationUnitKind TUKind;
222 /// \brief The code-completion handler.
223 CodeCompletionHandler *CodeComplete;
225 /// \brief The file that we're performing code-completion for, if any.
226 const FileEntry *CodeCompletionFile;
228 /// \brief The offset in file for the code-completion point.
229 unsigned CodeCompletionOffset;
231 /// \brief The location for the code-completion point. This gets instantiated
232 /// when the CodeCompletionFile gets \#include'ed for preprocessing.
233 SourceLocation CodeCompletionLoc;
235 /// \brief The start location for the file of the code-completion point.
237 /// This gets instantiated when the CodeCompletionFile gets \#include'ed
238 /// for preprocessing.
239 SourceLocation CodeCompletionFileLoc;
241 /// \brief The source location of the \c import contextual keyword we just
243 SourceLocation ModuleImportLoc;
245 /// \brief The module import path that we're currently processing.
246 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> ModuleImportPath;
248 /// \brief Whether the last token we lexed was an '@'.
251 /// \brief Whether the module import expects an identifier next. Otherwise,
252 /// it expects a '.' or ';'.
253 bool ModuleImportExpectsIdentifier;
255 /// \brief The source location of the currently-active
256 /// \#pragma clang arc_cf_code_audited begin.
257 SourceLocation PragmaARCCFCodeAuditedLoc;
259 /// \brief The source location of the currently-active
260 /// \#pragma clang assume_nonnull begin.
261 SourceLocation PragmaAssumeNonNullLoc;
263 /// \brief True if we hit the code-completion point.
264 bool CodeCompletionReached;
266 /// \brief The directory that the main file should be considered to occupy,
267 /// if it does not correspond to a real file (as happens when building a
269 const DirectoryEntry *MainFileDir;
271 /// \brief The number of bytes that we will initially skip when entering the
272 /// main file, along with a flag that indicates whether skipping this number
273 /// of bytes will place the lexer at the start of a line.
275 /// This is used when loading a precompiled preamble.
276 std::pair<int, bool> SkipMainFilePreamble;
278 /// \brief The current top of the stack that we're lexing from if
279 /// not expanding a macro and we are lexing directly from source code.
281 /// Only one of CurLexer, CurPTHLexer, or CurTokenLexer will be non-null.
282 std::unique_ptr<Lexer> CurLexer;
284 /// \brief The current top of stack that we're lexing from if
285 /// not expanding from a macro and we are lexing from a PTH cache.
287 /// Only one of CurLexer, CurPTHLexer, or CurTokenLexer will be non-null.
288 std::unique_ptr<PTHLexer> CurPTHLexer;
290 /// \brief The current top of the stack what we're lexing from
291 /// if not expanding a macro.
293 /// This is an alias for either CurLexer or CurPTHLexer.
294 PreprocessorLexer *CurPPLexer;
296 /// \brief Used to find the current FileEntry, if CurLexer is non-null
297 /// and if applicable.
299 /// This allows us to implement \#include_next and find directory-specific
301 const DirectoryLookup *CurDirLookup;
303 /// \brief The current macro we are expanding, if we are expanding a macro.
305 /// One of CurLexer and CurTokenLexer must be null.
306 std::unique_ptr<TokenLexer> CurTokenLexer;
308 /// \brief The kind of lexer we're currently working with.
314 CLK_LexAfterModuleImport
317 /// \brief If the current lexer is for a submodule that is being built, this
318 /// is that submodule.
319 Module *CurSubmodule;
321 /// \brief Keeps track of the stack of files currently
322 /// \#included, and macros currently being expanded from, not counting
323 /// CurLexer/CurTokenLexer.
324 struct IncludeStackInfo {
325 enum CurLexerKind CurLexerKind;
326 Module *TheSubmodule;
327 std::unique_ptr<Lexer> TheLexer;
328 std::unique_ptr<PTHLexer> ThePTHLexer;
329 PreprocessorLexer *ThePPLexer;
330 std::unique_ptr<TokenLexer> TheTokenLexer;
331 const DirectoryLookup *TheDirLookup;
333 // The following constructors are completely useless copies of the default
334 // versions, only needed to pacify MSVC.
335 IncludeStackInfo(enum CurLexerKind CurLexerKind, Module *TheSubmodule,
336 std::unique_ptr<Lexer> &&TheLexer,
337 std::unique_ptr<PTHLexer> &&ThePTHLexer,
338 PreprocessorLexer *ThePPLexer,
339 std::unique_ptr<TokenLexer> &&TheTokenLexer,
340 const DirectoryLookup *TheDirLookup)
341 : CurLexerKind(std::move(CurLexerKind)),
342 TheSubmodule(std::move(TheSubmodule)), TheLexer(std::move(TheLexer)),
343 ThePTHLexer(std::move(ThePTHLexer)),
344 ThePPLexer(std::move(ThePPLexer)),
345 TheTokenLexer(std::move(TheTokenLexer)),
346 TheDirLookup(std::move(TheDirLookup)) {}
347 IncludeStackInfo(IncludeStackInfo &&RHS)
348 : CurLexerKind(std::move(RHS.CurLexerKind)),
349 TheSubmodule(std::move(RHS.TheSubmodule)),
350 TheLexer(std::move(RHS.TheLexer)),
351 ThePTHLexer(std::move(RHS.ThePTHLexer)),
352 ThePPLexer(std::move(RHS.ThePPLexer)),
353 TheTokenLexer(std::move(RHS.TheTokenLexer)),
354 TheDirLookup(std::move(RHS.TheDirLookup)) {}
356 std::vector<IncludeStackInfo> IncludeMacroStack;
358 /// \brief Actions invoked when some preprocessor activity is
359 /// encountered (e.g. a file is \#included, etc).
360 std::unique_ptr<PPCallbacks> Callbacks;
362 struct MacroExpandsInfo {
366 MacroExpandsInfo(Token Tok, MacroDefinition MD, SourceRange Range)
367 : Tok(Tok), MD(MD), Range(Range) { }
369 SmallVector<MacroExpandsInfo, 2> DelayedMacroExpandsCallbacks;
371 /// Information about a name that has been used to define a module macro.
372 struct ModuleMacroInfo {
373 ModuleMacroInfo(MacroDirective *MD)
374 : MD(MD), ActiveModuleMacrosGeneration(0), IsAmbiguous(false) {}
376 /// The most recent macro directive for this identifier.
378 /// The active module macros for this identifier.
379 llvm::TinyPtrVector<ModuleMacro*> ActiveModuleMacros;
380 /// The generation number at which we last updated ActiveModuleMacros.
381 /// \see Preprocessor::VisibleModules.
382 unsigned ActiveModuleMacrosGeneration;
383 /// Whether this macro name is ambiguous.
385 /// The module macros that are overridden by this macro.
386 llvm::TinyPtrVector<ModuleMacro*> OverriddenMacros;
389 /// The state of a macro for an identifier.
391 mutable llvm::PointerUnion<MacroDirective *, ModuleMacroInfo *> State;
393 ModuleMacroInfo *getModuleInfo(Preprocessor &PP,
394 const IdentifierInfo *II) const {
395 // FIXME: Find a spare bit on IdentifierInfo and store a
396 // HasModuleMacros flag.
397 if (!II->hasMacroDefinition() ||
398 (!PP.getLangOpts().Modules &&
399 !PP.getLangOpts().ModulesLocalVisibility) ||
400 !PP.CurSubmoduleState->VisibleModules.getGeneration())
403 auto *Info = State.dyn_cast<ModuleMacroInfo*>();
405 Info = new (PP.getPreprocessorAllocator())
406 ModuleMacroInfo(State.get<MacroDirective *>());
410 if (PP.CurSubmoduleState->VisibleModules.getGeneration() !=
411 Info->ActiveModuleMacrosGeneration)
412 PP.updateModuleMacroInfo(II, *Info);
417 MacroState() : MacroState(nullptr) {}
418 MacroState(MacroDirective *MD) : State(MD) {}
419 MacroState(MacroState &&O) LLVM_NOEXCEPT : State(O.State) {
420 O.State = (MacroDirective *)nullptr;
422 MacroState &operator=(MacroState &&O) LLVM_NOEXCEPT {
424 O.State = (MacroDirective *)nullptr;
429 if (auto *Info = State.dyn_cast<ModuleMacroInfo*>())
430 Info->~ModuleMacroInfo();
433 MacroDirective *getLatest() const {
434 if (auto *Info = State.dyn_cast<ModuleMacroInfo*>())
436 return State.get<MacroDirective*>();
438 void setLatest(MacroDirective *MD) {
439 if (auto *Info = State.dyn_cast<ModuleMacroInfo*>())
445 bool isAmbiguous(Preprocessor &PP, const IdentifierInfo *II) const {
446 auto *Info = getModuleInfo(PP, II);
447 return Info ? Info->IsAmbiguous : false;
449 ArrayRef<ModuleMacro *>
450 getActiveModuleMacros(Preprocessor &PP, const IdentifierInfo *II) const {
451 if (auto *Info = getModuleInfo(PP, II))
452 return Info->ActiveModuleMacros;
456 MacroDirective::DefInfo findDirectiveAtLoc(SourceLocation Loc,
457 SourceManager &SourceMgr) const {
458 // FIXME: Incorporate module macros into the result of this.
459 if (auto *Latest = getLatest())
460 return Latest->findDirectiveAtLoc(Loc, SourceMgr);
461 return MacroDirective::DefInfo();
464 void overrideActiveModuleMacros(Preprocessor &PP, IdentifierInfo *II) {
465 if (auto *Info = getModuleInfo(PP, II)) {
466 Info->OverriddenMacros.insert(Info->OverriddenMacros.end(),
467 Info->ActiveModuleMacros.begin(),
468 Info->ActiveModuleMacros.end());
469 Info->ActiveModuleMacros.clear();
470 Info->IsAmbiguous = false;
473 ArrayRef<ModuleMacro*> getOverriddenMacros() const {
474 if (auto *Info = State.dyn_cast<ModuleMacroInfo*>())
475 return Info->OverriddenMacros;
478 void setOverriddenMacros(Preprocessor &PP,
479 ArrayRef<ModuleMacro *> Overrides) {
480 auto *Info = State.dyn_cast<ModuleMacroInfo*>();
482 if (Overrides.empty())
484 Info = new (PP.getPreprocessorAllocator())
485 ModuleMacroInfo(State.get<MacroDirective *>());
488 Info->OverriddenMacros.clear();
489 Info->OverriddenMacros.insert(Info->OverriddenMacros.end(),
490 Overrides.begin(), Overrides.end());
491 Info->ActiveModuleMacrosGeneration = 0;
495 /// For each IdentifierInfo that was associated with a macro, we
496 /// keep a mapping to the history of all macro definitions and #undefs in
497 /// the reverse order (the latest one is in the head of the list).
499 /// This mapping lives within the \p CurSubmoduleState.
500 typedef llvm::DenseMap<const IdentifierInfo *, MacroState> MacroMap;
502 friend class ASTReader;
504 struct SubmoduleState;
506 /// \brief Information about a submodule that we're currently building.
507 struct BuildingSubmoduleInfo {
508 BuildingSubmoduleInfo(Module *M, SourceLocation ImportLoc,
509 SubmoduleState *OuterSubmoduleState)
510 : M(M), ImportLoc(ImportLoc), OuterSubmoduleState(OuterSubmoduleState) {
513 /// The module that we are building.
515 /// The location at which the module was included.
516 SourceLocation ImportLoc;
517 /// The previous SubmoduleState.
518 SubmoduleState *OuterSubmoduleState;
520 SmallVector<BuildingSubmoduleInfo, 8> BuildingSubmoduleStack;
522 /// \brief Information about a submodule's preprocessor state.
523 struct SubmoduleState {
524 /// The macros for the submodule.
526 /// The set of modules that are visible within the submodule.
527 VisibleModuleSet VisibleModules;
528 // FIXME: CounterValue?
529 // FIXME: PragmaPushMacroInfo?
531 std::map<Module*, SubmoduleState> Submodules;
533 /// The preprocessor state for preprocessing outside of any submodule.
534 SubmoduleState NullSubmoduleState;
536 /// The current submodule state. Will be \p NullSubmoduleState if we're not
538 SubmoduleState *CurSubmoduleState;
540 /// The set of known macros exported from modules.
541 llvm::FoldingSet<ModuleMacro> ModuleMacros;
543 /// The list of module macros, for each identifier, that are not overridden by
544 /// any other module macro.
545 llvm::DenseMap<const IdentifierInfo *, llvm::TinyPtrVector<ModuleMacro*>>
548 /// \brief Macros that we want to warn because they are not used at the end
549 /// of the translation unit.
551 /// We store just their SourceLocations instead of
552 /// something like MacroInfo*. The benefit of this is that when we are
553 /// deserializing from PCH, we don't need to deserialize identifier & macros
554 /// just so that we can report that they are unused, we just warn using
555 /// the SourceLocations of this set (that will be filled by the ASTReader).
556 /// We are using SmallPtrSet instead of a vector for faster removal.
557 typedef llvm::SmallPtrSet<SourceLocation, 32> WarnUnusedMacroLocsTy;
558 WarnUnusedMacroLocsTy WarnUnusedMacroLocs;
560 /// \brief A "freelist" of MacroArg objects that can be
561 /// reused for quick allocation.
562 MacroArgs *MacroArgCache;
563 friend class MacroArgs;
565 /// For each IdentifierInfo used in a \#pragma push_macro directive,
566 /// we keep a MacroInfo stack used to restore the previous macro value.
567 llvm::DenseMap<IdentifierInfo*, std::vector<MacroInfo*> > PragmaPushMacroInfo;
569 // Various statistics we track for performance analysis.
570 unsigned NumDirectives, NumDefined, NumUndefined, NumPragma;
571 unsigned NumIf, NumElse, NumEndif;
572 unsigned NumEnteredSourceFiles, MaxIncludeStackDepth;
573 unsigned NumMacroExpanded, NumFnMacroExpanded, NumBuiltinMacroExpanded;
574 unsigned NumFastMacroExpanded, NumTokenPaste, NumFastTokenPaste;
577 /// \brief The predefined macros that preprocessor should use from the
578 /// command line etc.
579 std::string Predefines;
581 /// \brief The file ID for the preprocessor predefines.
582 FileID PredefinesFileID;
585 /// \brief Cache of macro expanders to reduce malloc traffic.
586 enum { TokenLexerCacheSize = 8 };
587 unsigned NumCachedTokenLexers;
588 std::unique_ptr<TokenLexer> TokenLexerCache[TokenLexerCacheSize];
591 /// \brief Keeps macro expanded tokens for TokenLexers.
593 /// Works like a stack; a TokenLexer adds the macro expanded tokens that is
594 /// going to lex in the cache and when it finishes the tokens are removed
595 /// from the end of the cache.
596 SmallVector<Token, 16> MacroExpandedTokens;
597 std::vector<std::pair<TokenLexer *, size_t> > MacroExpandingLexersStack;
599 /// \brief A record of the macro definitions and expansions that
600 /// occurred during preprocessing.
602 /// This is an optional side structure that can be enabled with
603 /// \c createPreprocessingRecord() prior to preprocessing.
604 PreprocessingRecord *Record;
606 /// Cached tokens state.
607 typedef SmallVector<Token, 1> CachedTokensTy;
609 /// \brief Cached tokens are stored here when we do backtracking or
610 /// lookahead. They are "lexed" by the CachingLex() method.
611 CachedTokensTy CachedTokens;
613 /// \brief The position of the cached token that CachingLex() should
616 /// If it points beyond the CachedTokens vector, it means that a normal
617 /// Lex() should be invoked.
618 CachedTokensTy::size_type CachedLexPos;
620 /// \brief Stack of backtrack positions, allowing nested backtracks.
622 /// The EnableBacktrackAtThisPos() method pushes a position to
623 /// indicate where CachedLexPos should be set when the BackTrack() method is
624 /// invoked (at which point the last position is popped).
625 std::vector<CachedTokensTy::size_type> BacktrackPositions;
627 struct MacroInfoChain {
629 MacroInfoChain *Next;
632 /// MacroInfos are managed as a chain for easy disposal. This is the head
634 MacroInfoChain *MIChainHead;
636 struct DeserializedMacroInfoChain {
638 unsigned OwningModuleID; // MUST be immediately after the MacroInfo object
639 // so it can be accessed by MacroInfo::getOwningModuleID().
640 DeserializedMacroInfoChain *Next;
642 DeserializedMacroInfoChain *DeserialMIChainHead;
645 Preprocessor(IntrusiveRefCntPtr<PreprocessorOptions> PPOpts,
646 DiagnosticsEngine &diags, LangOptions &opts,
647 SourceManager &SM, HeaderSearch &Headers,
648 ModuleLoader &TheModuleLoader,
649 IdentifierInfoLookup *IILookup = nullptr,
650 bool OwnsHeaderSearch = false,
651 TranslationUnitKind TUKind = TU_Complete);
655 /// \brief Initialize the preprocessor using information about the target.
657 /// \param Target is owned by the caller and must remain valid for the
658 /// lifetime of the preprocessor.
659 void Initialize(const TargetInfo &Target);
661 /// \brief Initialize the preprocessor to parse a model file
663 /// To parse model files the preprocessor of the original source is reused to
664 /// preserver the identifier table. However to avoid some duplicate
665 /// information in the preprocessor some cleanup is needed before it is used
666 /// to parse model files. This method does that cleanup.
667 void InitializeForModelFile();
669 /// \brief Cleanup after model file parsing
670 void FinalizeForModelFile();
672 /// \brief Retrieve the preprocessor options used to initialize this
674 PreprocessorOptions &getPreprocessorOpts() const { return *PPOpts; }
676 DiagnosticsEngine &getDiagnostics() const { return *Diags; }
677 void setDiagnostics(DiagnosticsEngine &D) { Diags = &D; }
679 const LangOptions &getLangOpts() const { return LangOpts; }
680 const TargetInfo &getTargetInfo() const { return *Target; }
681 FileManager &getFileManager() const { return FileMgr; }
682 SourceManager &getSourceManager() const { return SourceMgr; }
683 HeaderSearch &getHeaderSearchInfo() const { return HeaderInfo; }
685 IdentifierTable &getIdentifierTable() { return Identifiers; }
686 const IdentifierTable &getIdentifierTable() const { return Identifiers; }
687 SelectorTable &getSelectorTable() { return Selectors; }
688 Builtin::Context &getBuiltinInfo() { return BuiltinInfo; }
689 llvm::BumpPtrAllocator &getPreprocessorAllocator() { return BP; }
691 void setPTHManager(PTHManager* pm);
693 PTHManager *getPTHManager() { return PTH.get(); }
695 void setExternalSource(ExternalPreprocessorSource *Source) {
696 ExternalSource = Source;
699 ExternalPreprocessorSource *getExternalSource() const {
700 return ExternalSource;
703 /// \brief Retrieve the module loader associated with this preprocessor.
704 ModuleLoader &getModuleLoader() const { return TheModuleLoader; }
706 bool hadModuleLoaderFatalFailure() const {
707 return TheModuleLoader.HadFatalFailure;
710 /// \brief True if we are currently preprocessing a #if or #elif directive
711 bool isParsingIfOrElifDirective() const {
712 return ParsingIfOrElifDirective;
715 /// \brief Control whether the preprocessor retains comments in output.
716 void SetCommentRetentionState(bool KeepComments, bool KeepMacroComments) {
717 this->KeepComments = KeepComments | KeepMacroComments;
718 this->KeepMacroComments = KeepMacroComments;
721 bool getCommentRetentionState() const { return KeepComments; }
723 void setPragmasEnabled(bool Enabled) { PragmasEnabled = Enabled; }
724 bool getPragmasEnabled() const { return PragmasEnabled; }
726 void SetSuppressIncludeNotFoundError(bool Suppress) {
727 SuppressIncludeNotFoundError = Suppress;
730 bool GetSuppressIncludeNotFoundError() {
731 return SuppressIncludeNotFoundError;
734 /// Sets whether the preprocessor is responsible for producing output or if
735 /// it is producing tokens to be consumed by Parse and Sema.
736 void setPreprocessedOutput(bool IsPreprocessedOutput) {
737 PreprocessedOutput = IsPreprocessedOutput;
740 /// Returns true if the preprocessor is responsible for generating output,
741 /// false if it is producing tokens to be consumed by Parse and Sema.
742 bool isPreprocessedOutput() const { return PreprocessedOutput; }
744 /// \brief Return true if we are lexing directly from the specified lexer.
745 bool isCurrentLexer(const PreprocessorLexer *L) const {
746 return CurPPLexer == L;
749 /// \brief Return the current lexer being lexed from.
751 /// Note that this ignores any potentially active macro expansions and _Pragma
752 /// expansions going on at the time.
753 PreprocessorLexer *getCurrentLexer() const { return CurPPLexer; }
755 /// \brief Return the current file lexer being lexed from.
757 /// Note that this ignores any potentially active macro expansions and _Pragma
758 /// expansions going on at the time.
759 PreprocessorLexer *getCurrentFileLexer() const;
761 /// \brief Return the submodule owning the file being lexed.
762 Module *getCurrentSubmodule() const { return CurSubmodule; }
764 /// \brief Returns the FileID for the preprocessor predefines.
765 FileID getPredefinesFileID() const { return PredefinesFileID; }
768 /// \brief Accessors for preprocessor callbacks.
770 /// Note that this class takes ownership of any PPCallbacks object given to
772 PPCallbacks *getPPCallbacks() const { return Callbacks.get(); }
773 void addPPCallbacks(std::unique_ptr<PPCallbacks> C) {
775 C = llvm::make_unique<PPChainedCallbacks>(std::move(C),
776 std::move(Callbacks));
777 Callbacks = std::move(C);
781 bool isMacroDefined(StringRef Id) {
782 return isMacroDefined(&Identifiers.get(Id));
784 bool isMacroDefined(const IdentifierInfo *II) {
785 return II->hasMacroDefinition() &&
786 (!getLangOpts().Modules || (bool)getMacroDefinition(II));
789 MacroDefinition getMacroDefinition(const IdentifierInfo *II) {
790 if (!II->hasMacroDefinition())
791 return MacroDefinition();
793 MacroState &S = CurSubmoduleState->Macros[II];
794 auto *MD = S.getLatest();
795 while (MD && isa<VisibilityMacroDirective>(MD))
796 MD = MD->getPrevious();
797 return MacroDefinition(dyn_cast_or_null<DefMacroDirective>(MD),
798 S.getActiveModuleMacros(*this, II),
799 S.isAmbiguous(*this, II));
802 MacroDefinition getMacroDefinitionAtLoc(const IdentifierInfo *II,
803 SourceLocation Loc) {
804 if (!II->hadMacroDefinition())
805 return MacroDefinition();
807 MacroState &S = CurSubmoduleState->Macros[II];
808 MacroDirective::DefInfo DI;
809 if (auto *MD = S.getLatest())
810 DI = MD->findDirectiveAtLoc(Loc, getSourceManager());
811 // FIXME: Compute the set of active module macros at the specified location.
812 return MacroDefinition(DI.getDirective(),
813 S.getActiveModuleMacros(*this, II),
814 S.isAmbiguous(*this, II));
817 /// \brief Given an identifier, return its latest non-imported MacroDirective
818 /// if it is \#define'd and not \#undef'd, or null if it isn't \#define'd.
819 MacroDirective *getLocalMacroDirective(const IdentifierInfo *II) const {
820 if (!II->hasMacroDefinition())
823 auto *MD = getLocalMacroDirectiveHistory(II);
824 if (!MD || MD->getDefinition().isUndefined())
830 const MacroInfo *getMacroInfo(const IdentifierInfo *II) const {
831 return const_cast<Preprocessor*>(this)->getMacroInfo(II);
834 MacroInfo *getMacroInfo(const IdentifierInfo *II) {
835 if (!II->hasMacroDefinition())
837 if (auto MD = getMacroDefinition(II))
838 return MD.getMacroInfo();
842 /// \brief Given an identifier, return the latest non-imported macro
843 /// directive for that identifier.
845 /// One can iterate over all previous macro directives from the most recent
847 MacroDirective *getLocalMacroDirectiveHistory(const IdentifierInfo *II) const;
849 /// \brief Add a directive to the macro directive history for this identifier.
850 void appendMacroDirective(IdentifierInfo *II, MacroDirective *MD);
851 DefMacroDirective *appendDefMacroDirective(IdentifierInfo *II, MacroInfo *MI,
852 SourceLocation Loc) {
853 DefMacroDirective *MD = AllocateDefMacroDirective(MI, Loc);
854 appendMacroDirective(II, MD);
857 DefMacroDirective *appendDefMacroDirective(IdentifierInfo *II,
859 return appendDefMacroDirective(II, MI, MI->getDefinitionLoc());
861 /// \brief Set a MacroDirective that was loaded from a PCH file.
862 void setLoadedMacroDirective(IdentifierInfo *II, MacroDirective *MD);
864 /// \brief Register an exported macro for a module and identifier.
865 ModuleMacro *addModuleMacro(Module *Mod, IdentifierInfo *II, MacroInfo *Macro,
866 ArrayRef<ModuleMacro *> Overrides, bool &IsNew);
867 ModuleMacro *getModuleMacro(Module *Mod, IdentifierInfo *II);
869 /// \brief Get the list of leaf (non-overridden) module macros for a name.
870 ArrayRef<ModuleMacro*> getLeafModuleMacros(const IdentifierInfo *II) const {
871 auto I = LeafModuleMacros.find(II);
872 if (I != LeafModuleMacros.end())
878 /// Iterators for the macro history table. Currently defined macros have
879 /// IdentifierInfo::hasMacroDefinition() set and an empty
880 /// MacroInfo::getUndefLoc() at the head of the list.
881 typedef MacroMap::const_iterator macro_iterator;
882 macro_iterator macro_begin(bool IncludeExternalMacros = true) const;
883 macro_iterator macro_end(bool IncludeExternalMacros = true) const;
884 llvm::iterator_range<macro_iterator>
885 macros(bool IncludeExternalMacros = true) const {
886 return llvm::make_range(macro_begin(IncludeExternalMacros),
887 macro_end(IncludeExternalMacros));
891 /// \brief Return the name of the macro defined before \p Loc that has
892 /// spelling \p Tokens. If there are multiple macros with same spelling,
893 /// return the last one defined.
894 StringRef getLastMacroWithSpelling(SourceLocation Loc,
895 ArrayRef<TokenValue> Tokens) const;
897 const std::string &getPredefines() const { return Predefines; }
898 /// \brief Set the predefines for this Preprocessor.
900 /// These predefines are automatically injected when parsing the main file.
901 void setPredefines(const char *P) { Predefines = P; }
902 void setPredefines(StringRef P) { Predefines = P; }
904 /// Return information about the specified preprocessor
905 /// identifier token.
906 IdentifierInfo *getIdentifierInfo(StringRef Name) const {
907 return &Identifiers.get(Name);
910 /// \brief Add the specified pragma handler to this preprocessor.
912 /// If \p Namespace is non-null, then it is a token required to exist on the
913 /// pragma line before the pragma string starts, e.g. "STDC" or "GCC".
914 void AddPragmaHandler(StringRef Namespace, PragmaHandler *Handler);
915 void AddPragmaHandler(PragmaHandler *Handler) {
916 AddPragmaHandler(StringRef(), Handler);
919 /// \brief Remove the specific pragma handler from this preprocessor.
921 /// If \p Namespace is non-null, then it should be the namespace that
922 /// \p Handler was added to. It is an error to remove a handler that
923 /// has not been registered.
924 void RemovePragmaHandler(StringRef Namespace, PragmaHandler *Handler);
925 void RemovePragmaHandler(PragmaHandler *Handler) {
926 RemovePragmaHandler(StringRef(), Handler);
929 /// Install empty handlers for all pragmas (making them ignored).
930 void IgnorePragmas();
932 /// \brief Add the specified comment handler to the preprocessor.
933 void addCommentHandler(CommentHandler *Handler);
935 /// \brief Remove the specified comment handler.
937 /// It is an error to remove a handler that has not been registered.
938 void removeCommentHandler(CommentHandler *Handler);
940 /// \brief Set the code completion handler to the given object.
941 void setCodeCompletionHandler(CodeCompletionHandler &Handler) {
942 CodeComplete = &Handler;
945 /// \brief Retrieve the current code-completion handler.
946 CodeCompletionHandler *getCodeCompletionHandler() const {
950 /// \brief Clear out the code completion handler.
951 void clearCodeCompletionHandler() {
952 CodeComplete = nullptr;
955 /// \brief Hook used by the lexer to invoke the "natural language" code
956 /// completion point.
957 void CodeCompleteNaturalLanguage();
959 /// \brief Retrieve the preprocessing record, or NULL if there is no
960 /// preprocessing record.
961 PreprocessingRecord *getPreprocessingRecord() const { return Record; }
963 /// \brief Create a new preprocessing record, which will keep track of
964 /// all macro expansions, macro definitions, etc.
965 void createPreprocessingRecord();
967 /// \brief Enter the specified FileID as the main source file,
968 /// which implicitly adds the builtin defines etc.
969 void EnterMainSourceFile();
971 /// \brief Inform the preprocessor callbacks that processing is complete.
972 void EndSourceFile();
974 /// \brief Add a source file to the top of the include stack and
975 /// start lexing tokens from it instead of the current buffer.
977 /// Emits a diagnostic, doesn't enter the file, and returns true on error.
978 bool EnterSourceFile(FileID CurFileID, const DirectoryLookup *Dir,
981 /// \brief Add a Macro to the top of the include stack and start lexing
982 /// tokens from it instead of the current buffer.
984 /// \param Args specifies the tokens input to a function-like macro.
985 /// \param ILEnd specifies the location of the ')' for a function-like macro
986 /// or the identifier for an object-like macro.
987 void EnterMacro(Token &Identifier, SourceLocation ILEnd, MacroInfo *Macro,
990 /// \brief Add a "macro" context to the top of the include stack,
991 /// which will cause the lexer to start returning the specified tokens.
993 /// If \p DisableMacroExpansion is true, tokens lexed from the token stream
994 /// will not be subject to further macro expansion. Otherwise, these tokens
995 /// will be re-macro-expanded when/if expansion is enabled.
997 /// If \p OwnsTokens is false, this method assumes that the specified stream
998 /// of tokens has a permanent owner somewhere, so they do not need to be
999 /// copied. If it is true, it assumes the array of tokens is allocated with
1000 /// \c new[] and must be freed.
1001 void EnterTokenStream(const Token *Toks, unsigned NumToks,
1002 bool DisableMacroExpansion, bool OwnsTokens);
1004 /// \brief Pop the current lexer/macro exp off the top of the lexer stack.
1006 /// This should only be used in situations where the current state of the
1007 /// top-of-stack lexer is known.
1008 void RemoveTopOfLexerStack();
1010 /// From the point that this method is called, and until
1011 /// CommitBacktrackedTokens() or Backtrack() is called, the Preprocessor
1012 /// keeps track of the lexed tokens so that a subsequent Backtrack() call will
1013 /// make the Preprocessor re-lex the same tokens.
1015 /// Nested backtracks are allowed, meaning that EnableBacktrackAtThisPos can
1016 /// be called multiple times and CommitBacktrackedTokens/Backtrack calls will
1017 /// be combined with the EnableBacktrackAtThisPos calls in reverse order.
1019 /// NOTE: *DO NOT* forget to call either CommitBacktrackedTokens or Backtrack
1020 /// at some point after EnableBacktrackAtThisPos. If you don't, caching of
1021 /// tokens will continue indefinitely.
1023 void EnableBacktrackAtThisPos();
1025 /// \brief Disable the last EnableBacktrackAtThisPos call.
1026 void CommitBacktrackedTokens();
1028 /// \brief Make Preprocessor re-lex the tokens that were lexed since
1029 /// EnableBacktrackAtThisPos() was previously called.
1032 /// \brief True if EnableBacktrackAtThisPos() was called and
1033 /// caching of tokens is on.
1034 bool isBacktrackEnabled() const { return !BacktrackPositions.empty(); }
1036 /// \brief Lex the next token for this preprocessor.
1037 void Lex(Token &Result);
1039 void LexAfterModuleImport(Token &Result);
1041 void makeModuleVisible(Module *M, SourceLocation Loc);
1043 SourceLocation getModuleImportLoc(Module *M) const {
1044 return CurSubmoduleState->VisibleModules.getImportLoc(M);
1047 /// \brief Lex a string literal, which may be the concatenation of multiple
1048 /// string literals and may even come from macro expansion.
1049 /// \returns true on success, false if a error diagnostic has been generated.
1050 bool LexStringLiteral(Token &Result, std::string &String,
1051 const char *DiagnosticTag, bool AllowMacroExpansion) {
1052 if (AllowMacroExpansion)
1055 LexUnexpandedToken(Result);
1056 return FinishLexStringLiteral(Result, String, DiagnosticTag,
1057 AllowMacroExpansion);
1060 /// \brief Complete the lexing of a string literal where the first token has
1061 /// already been lexed (see LexStringLiteral).
1062 bool FinishLexStringLiteral(Token &Result, std::string &String,
1063 const char *DiagnosticTag,
1064 bool AllowMacroExpansion);
1066 /// \brief Lex a token. If it's a comment, keep lexing until we get
1067 /// something not a comment.
1069 /// This is useful in -E -C mode where comments would foul up preprocessor
1070 /// directive handling.
1071 void LexNonComment(Token &Result) {
1074 while (Result.getKind() == tok::comment);
1077 /// \brief Just like Lex, but disables macro expansion of identifier tokens.
1078 void LexUnexpandedToken(Token &Result) {
1079 // Disable macro expansion.
1080 bool OldVal = DisableMacroExpansion;
1081 DisableMacroExpansion = true;
1086 DisableMacroExpansion = OldVal;
1089 /// \brief Like LexNonComment, but this disables macro expansion of
1090 /// identifier tokens.
1091 void LexUnexpandedNonComment(Token &Result) {
1093 LexUnexpandedToken(Result);
1094 while (Result.getKind() == tok::comment);
1097 /// \brief Parses a simple integer literal to get its numeric value. Floating
1098 /// point literals and user defined literals are rejected. Used primarily to
1099 /// handle pragmas that accept integer arguments.
1100 bool parseSimpleIntegerLiteral(Token &Tok, uint64_t &Value);
1102 /// Disables macro expansion everywhere except for preprocessor directives.
1103 void SetMacroExpansionOnlyInDirectives() {
1104 DisableMacroExpansion = true;
1105 MacroExpansionInDirectivesOverride = true;
1108 /// \brief Peeks ahead N tokens and returns that token without consuming any
1111 /// LookAhead(0) returns the next token that would be returned by Lex(),
1112 /// LookAhead(1) returns the token after it, etc. This returns normal
1113 /// tokens after phase 5. As such, it is equivalent to using
1114 /// 'Lex', not 'LexUnexpandedToken'.
1115 const Token &LookAhead(unsigned N) {
1116 if (CachedLexPos + N < CachedTokens.size())
1117 return CachedTokens[CachedLexPos+N];
1119 return PeekAhead(N+1);
1122 /// \brief When backtracking is enabled and tokens are cached,
1123 /// this allows to revert a specific number of tokens.
1125 /// Note that the number of tokens being reverted should be up to the last
1126 /// backtrack position, not more.
1127 void RevertCachedTokens(unsigned N) {
1128 assert(isBacktrackEnabled() &&
1129 "Should only be called when tokens are cached for backtracking");
1130 assert(signed(CachedLexPos) - signed(N) >= signed(BacktrackPositions.back())
1131 && "Should revert tokens up to the last backtrack position, not more");
1132 assert(signed(CachedLexPos) - signed(N) >= 0 &&
1133 "Corrupted backtrack positions ?");
1137 /// \brief Enters a token in the token stream to be lexed next.
1139 /// If BackTrack() is called afterwards, the token will remain at the
1140 /// insertion point.
1141 void EnterToken(const Token &Tok) {
1142 EnterCachingLexMode();
1143 CachedTokens.insert(CachedTokens.begin()+CachedLexPos, Tok);
1146 /// We notify the Preprocessor that if it is caching tokens (because
1147 /// backtrack is enabled) it should replace the most recent cached tokens
1148 /// with the given annotation token. This function has no effect if
1149 /// backtracking is not enabled.
1151 /// Note that the use of this function is just for optimization, so that the
1152 /// cached tokens doesn't get re-parsed and re-resolved after a backtrack is
1154 void AnnotateCachedTokens(const Token &Tok) {
1155 assert(Tok.isAnnotation() && "Expected annotation token");
1156 if (CachedLexPos != 0 && isBacktrackEnabled())
1157 AnnotatePreviousCachedTokens(Tok);
1160 /// Get the location of the last cached token, suitable for setting the end
1161 /// location of an annotation token.
1162 SourceLocation getLastCachedTokenLocation() const {
1163 assert(CachedLexPos != 0);
1164 return CachedTokens[CachedLexPos-1].getLastLoc();
1167 /// \brief Replace the last token with an annotation token.
1169 /// Like AnnotateCachedTokens(), this routine replaces an
1170 /// already-parsed (and resolved) token with an annotation
1171 /// token. However, this routine only replaces the last token with
1172 /// the annotation token; it does not affect any other cached
1173 /// tokens. This function has no effect if backtracking is not
1175 void ReplaceLastTokenWithAnnotation(const Token &Tok) {
1176 assert(Tok.isAnnotation() && "Expected annotation token");
1177 if (CachedLexPos != 0 && isBacktrackEnabled())
1178 CachedTokens[CachedLexPos-1] = Tok;
1181 /// Update the current token to represent the provided
1182 /// identifier, in order to cache an action performed by typo correction.
1183 void TypoCorrectToken(const Token &Tok) {
1184 assert(Tok.getIdentifierInfo() && "Expected identifier token");
1185 if (CachedLexPos != 0 && isBacktrackEnabled())
1186 CachedTokens[CachedLexPos-1] = Tok;
1189 /// \brief Recompute the current lexer kind based on the CurLexer/CurPTHLexer/
1190 /// CurTokenLexer pointers.
1191 void recomputeCurLexerKind();
1193 /// \brief Returns true if incremental processing is enabled
1194 bool isIncrementalProcessingEnabled() const { return IncrementalProcessing; }
1196 /// \brief Enables the incremental processing
1197 void enableIncrementalProcessing(bool value = true) {
1198 IncrementalProcessing = value;
1201 /// \brief Specify the point at which code-completion will be performed.
1203 /// \param File the file in which code completion should occur. If
1204 /// this file is included multiple times, code-completion will
1205 /// perform completion the first time it is included. If NULL, this
1206 /// function clears out the code-completion point.
1208 /// \param Line the line at which code completion should occur
1211 /// \param Column the column at which code completion should occur
1214 /// \returns true if an error occurred, false otherwise.
1215 bool SetCodeCompletionPoint(const FileEntry *File,
1216 unsigned Line, unsigned Column);
1218 /// \brief Determine if we are performing code completion.
1219 bool isCodeCompletionEnabled() const { return CodeCompletionFile != nullptr; }
1221 /// \brief Returns the location of the code-completion point.
1223 /// Returns an invalid location if code-completion is not enabled or the file
1224 /// containing the code-completion point has not been lexed yet.
1225 SourceLocation getCodeCompletionLoc() const { return CodeCompletionLoc; }
1227 /// \brief Returns the start location of the file of code-completion point.
1229 /// Returns an invalid location if code-completion is not enabled or the file
1230 /// containing the code-completion point has not been lexed yet.
1231 SourceLocation getCodeCompletionFileLoc() const {
1232 return CodeCompletionFileLoc;
1235 /// \brief Returns true if code-completion is enabled and we have hit the
1236 /// code-completion point.
1237 bool isCodeCompletionReached() const { return CodeCompletionReached; }
1239 /// \brief Note that we hit the code-completion point.
1240 void setCodeCompletionReached() {
1241 assert(isCodeCompletionEnabled() && "Code-completion not enabled!");
1242 CodeCompletionReached = true;
1243 // Silence any diagnostics that occur after we hit the code-completion.
1244 getDiagnostics().setSuppressAllDiagnostics(true);
1247 /// \brief The location of the currently-active \#pragma clang
1248 /// arc_cf_code_audited begin.
1250 /// Returns an invalid location if there is no such pragma active.
1251 SourceLocation getPragmaARCCFCodeAuditedLoc() const {
1252 return PragmaARCCFCodeAuditedLoc;
1255 /// \brief Set the location of the currently-active \#pragma clang
1256 /// arc_cf_code_audited begin. An invalid location ends the pragma.
1257 void setPragmaARCCFCodeAuditedLoc(SourceLocation Loc) {
1258 PragmaARCCFCodeAuditedLoc = Loc;
1261 /// \brief The location of the currently-active \#pragma clang
1262 /// assume_nonnull begin.
1264 /// Returns an invalid location if there is no such pragma active.
1265 SourceLocation getPragmaAssumeNonNullLoc() const {
1266 return PragmaAssumeNonNullLoc;
1269 /// \brief Set the location of the currently-active \#pragma clang
1270 /// assume_nonnull begin. An invalid location ends the pragma.
1271 void setPragmaAssumeNonNullLoc(SourceLocation Loc) {
1272 PragmaAssumeNonNullLoc = Loc;
1275 /// \brief Set the directory in which the main file should be considered
1276 /// to have been found, if it is not a real file.
1277 void setMainFileDir(const DirectoryEntry *Dir) {
1281 /// \brief Instruct the preprocessor to skip part of the main source file.
1283 /// \param Bytes The number of bytes in the preamble to skip.
1285 /// \param StartOfLine Whether skipping these bytes puts the lexer at the
1286 /// start of a line.
1287 void setSkipMainFilePreamble(unsigned Bytes, bool StartOfLine) {
1288 SkipMainFilePreamble.first = Bytes;
1289 SkipMainFilePreamble.second = StartOfLine;
1292 /// Forwarding function for diagnostics. This emits a diagnostic at
1293 /// the specified Token's location, translating the token's start
1294 /// position in the current buffer into a SourcePosition object for rendering.
1295 DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) const {
1296 return Diags->Report(Loc, DiagID);
1299 DiagnosticBuilder Diag(const Token &Tok, unsigned DiagID) const {
1300 return Diags->Report(Tok.getLocation(), DiagID);
1303 /// Return the 'spelling' of the token at the given
1304 /// location; does not go up to the spelling location or down to the
1305 /// expansion location.
1307 /// \param buffer A buffer which will be used only if the token requires
1308 /// "cleaning", e.g. if it contains trigraphs or escaped newlines
1309 /// \param invalid If non-null, will be set \c true if an error occurs.
1310 StringRef getSpelling(SourceLocation loc,
1311 SmallVectorImpl<char> &buffer,
1312 bool *invalid = nullptr) const {
1313 return Lexer::getSpelling(loc, buffer, SourceMgr, LangOpts, invalid);
1316 /// \brief Return the 'spelling' of the Tok token.
1318 /// The spelling of a token is the characters used to represent the token in
1319 /// the source file after trigraph expansion and escaped-newline folding. In
1320 /// particular, this wants to get the true, uncanonicalized, spelling of
1321 /// things like digraphs, UCNs, etc.
1323 /// \param Invalid If non-null, will be set \c true if an error occurs.
1324 std::string getSpelling(const Token &Tok, bool *Invalid = nullptr) const {
1325 return Lexer::getSpelling(Tok, SourceMgr, LangOpts, Invalid);
1328 /// \brief Get the spelling of a token into a preallocated buffer, instead
1329 /// of as an std::string.
1331 /// The caller is required to allocate enough space for the token, which is
1332 /// guaranteed to be at least Tok.getLength() bytes long. The length of the
1333 /// actual result is returned.
1335 /// Note that this method may do two possible things: it may either fill in
1336 /// the buffer specified with characters, or it may *change the input pointer*
1337 /// to point to a constant buffer with the data already in it (avoiding a
1338 /// copy). The caller is not allowed to modify the returned buffer pointer
1339 /// if an internal buffer is returned.
1340 unsigned getSpelling(const Token &Tok, const char *&Buffer,
1341 bool *Invalid = nullptr) const {
1342 return Lexer::getSpelling(Tok, Buffer, SourceMgr, LangOpts, Invalid);
1345 /// \brief Get the spelling of a token into a SmallVector.
1347 /// Note that the returned StringRef may not point to the
1348 /// supplied buffer if a copy can be avoided.
1349 StringRef getSpelling(const Token &Tok,
1350 SmallVectorImpl<char> &Buffer,
1351 bool *Invalid = nullptr) const;
1353 /// \brief Relex the token at the specified location.
1354 /// \returns true if there was a failure, false on success.
1355 bool getRawToken(SourceLocation Loc, Token &Result,
1356 bool IgnoreWhiteSpace = false) {
1357 return Lexer::getRawToken(Loc, Result, SourceMgr, LangOpts, IgnoreWhiteSpace);
1360 /// \brief Given a Token \p Tok that is a numeric constant with length 1,
1361 /// return the character.
1363 getSpellingOfSingleCharacterNumericConstant(const Token &Tok,
1364 bool *Invalid = nullptr) const {
1365 assert(Tok.is(tok::numeric_constant) &&
1366 Tok.getLength() == 1 && "Called on unsupported token");
1367 assert(!Tok.needsCleaning() && "Token can't need cleaning with length 1");
1369 // If the token is carrying a literal data pointer, just use it.
1370 if (const char *D = Tok.getLiteralData())
1373 // Otherwise, fall back on getCharacterData, which is slower, but always
1375 return *SourceMgr.getCharacterData(Tok.getLocation(), Invalid);
1378 /// \brief Retrieve the name of the immediate macro expansion.
1380 /// This routine starts from a source location, and finds the name of the
1381 /// macro responsible for its immediate expansion. It looks through any
1382 /// intervening macro argument expansions to compute this. It returns a
1383 /// StringRef that refers to the SourceManager-owned buffer of the source
1384 /// where that macro name is spelled. Thus, the result shouldn't out-live
1385 /// the SourceManager.
1386 StringRef getImmediateMacroName(SourceLocation Loc) {
1387 return Lexer::getImmediateMacroName(Loc, SourceMgr, getLangOpts());
1390 /// \brief Plop the specified string into a scratch buffer and set the
1391 /// specified token's location and length to it.
1393 /// If specified, the source location provides a location of the expansion
1394 /// point of the token.
1395 void CreateString(StringRef Str, Token &Tok,
1396 SourceLocation ExpansionLocStart = SourceLocation(),
1397 SourceLocation ExpansionLocEnd = SourceLocation());
1399 /// \brief Computes the source location just past the end of the
1400 /// token at this source location.
1402 /// This routine can be used to produce a source location that
1403 /// points just past the end of the token referenced by \p Loc, and
1404 /// is generally used when a diagnostic needs to point just after a
1405 /// token where it expected something different that it received. If
1406 /// the returned source location would not be meaningful (e.g., if
1407 /// it points into a macro), this routine returns an invalid
1408 /// source location.
1410 /// \param Offset an offset from the end of the token, where the source
1411 /// location should refer to. The default offset (0) produces a source
1412 /// location pointing just past the end of the token; an offset of 1 produces
1413 /// a source location pointing to the last character in the token, etc.
1414 SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0) {
1415 return Lexer::getLocForEndOfToken(Loc, Offset, SourceMgr, LangOpts);
1418 /// \brief Returns true if the given MacroID location points at the first
1419 /// token of the macro expansion.
1421 /// \param MacroBegin If non-null and function returns true, it is set to
1422 /// begin location of the macro.
1423 bool isAtStartOfMacroExpansion(SourceLocation loc,
1424 SourceLocation *MacroBegin = nullptr) const {
1425 return Lexer::isAtStartOfMacroExpansion(loc, SourceMgr, LangOpts,
1429 /// \brief Returns true if the given MacroID location points at the last
1430 /// token of the macro expansion.
1432 /// \param MacroEnd If non-null and function returns true, it is set to
1433 /// end location of the macro.
1434 bool isAtEndOfMacroExpansion(SourceLocation loc,
1435 SourceLocation *MacroEnd = nullptr) const {
1436 return Lexer::isAtEndOfMacroExpansion(loc, SourceMgr, LangOpts, MacroEnd);
1439 /// \brief Print the token to stderr, used for debugging.
1440 void DumpToken(const Token &Tok, bool DumpFlags = false) const;
1441 void DumpLocation(SourceLocation Loc) const;
1442 void DumpMacro(const MacroInfo &MI) const;
1443 void dumpMacroInfo(const IdentifierInfo *II);
1445 /// \brief Given a location that specifies the start of a
1446 /// token, return a new location that specifies a character within the token.
1447 SourceLocation AdvanceToTokenCharacter(SourceLocation TokStart,
1448 unsigned Char) const {
1449 return Lexer::AdvanceToTokenCharacter(TokStart, Char, SourceMgr, LangOpts);
1452 /// \brief Increment the counters for the number of token paste operations
1455 /// If fast was specified, this is a 'fast paste' case we handled.
1456 void IncrementPasteCounter(bool isFast) {
1458 ++NumFastTokenPaste;
1465 size_t getTotalMemory() const;
1467 /// When the macro expander pastes together a comment (/##/) in Microsoft
1468 /// mode, this method handles updating the current state, returning the
1469 /// token on the next source line.
1470 void HandleMicrosoftCommentPaste(Token &Tok);
1472 //===--------------------------------------------------------------------===//
1473 // Preprocessor callback methods. These are invoked by a lexer as various
1474 // directives and events are found.
1476 /// Given a tok::raw_identifier token, look up the
1477 /// identifier information for the token and install it into the token,
1478 /// updating the token kind accordingly.
1479 IdentifierInfo *LookUpIdentifierInfo(Token &Identifier) const;
1482 llvm::DenseMap<IdentifierInfo*,unsigned> PoisonReasons;
1486 /// \brief Specifies the reason for poisoning an identifier.
1488 /// If that identifier is accessed while poisoned, then this reason will be
1489 /// used instead of the default "poisoned" diagnostic.
1490 void SetPoisonReason(IdentifierInfo *II, unsigned DiagID);
1492 /// \brief Display reason for poisoned identifier.
1493 void HandlePoisonedIdentifier(Token & Tok);
1495 void MaybeHandlePoisonedIdentifier(Token & Identifier) {
1496 if(IdentifierInfo * II = Identifier.getIdentifierInfo()) {
1497 if(II->isPoisoned()) {
1498 HandlePoisonedIdentifier(Identifier);
1504 /// Identifiers used for SEH handling in Borland. These are only
1505 /// allowed in particular circumstances
1507 IdentifierInfo *Ident__exception_code,
1508 *Ident___exception_code,
1509 *Ident_GetExceptionCode;
1510 // __except filter expression
1511 IdentifierInfo *Ident__exception_info,
1512 *Ident___exception_info,
1513 *Ident_GetExceptionInfo;
1515 IdentifierInfo *Ident__abnormal_termination,
1516 *Ident___abnormal_termination,
1517 *Ident_AbnormalTermination;
1519 const char *getCurLexerEndPos();
1522 void PoisonSEHIdentifiers(bool Poison = true); // Borland
1524 /// \brief Callback invoked when the lexer reads an identifier and has
1525 /// filled in the tokens IdentifierInfo member.
1527 /// This callback potentially macro expands it or turns it into a named
1528 /// token (like 'for').
1530 /// \returns true if we actually computed a token, false if we need to
1532 bool HandleIdentifier(Token &Identifier);
1535 /// \brief Callback invoked when the lexer hits the end of the current file.
1537 /// This either returns the EOF token and returns true, or
1538 /// pops a level off the include stack and returns false, at which point the
1539 /// client should call lex again.
1540 bool HandleEndOfFile(Token &Result, bool isEndOfMacro = false);
1542 /// \brief Callback invoked when the current TokenLexer hits the end of its
1544 bool HandleEndOfTokenLexer(Token &Result);
1546 /// \brief Callback invoked when the lexer sees a # token at the start of a
1549 /// This consumes the directive, modifies the lexer/preprocessor state, and
1550 /// advances the lexer(s) so that the next token read is the correct one.
1551 void HandleDirective(Token &Result);
1553 /// \brief Ensure that the next token is a tok::eod token.
1555 /// If not, emit a diagnostic and consume up until the eod.
1556 /// If \p EnableMacros is true, then we consider macros that expand to zero
1557 /// tokens as being ok.
1558 void CheckEndOfDirective(const char *Directive, bool EnableMacros = false);
1560 /// \brief Read and discard all tokens remaining on the current line until
1561 /// the tok::eod token is found.
1562 void DiscardUntilEndOfDirective();
1564 /// \brief Returns true if the preprocessor has seen a use of
1565 /// __DATE__ or __TIME__ in the file so far.
1566 bool SawDateOrTime() const {
1567 return DATELoc != SourceLocation() || TIMELoc != SourceLocation();
1569 unsigned getCounterValue() const { return CounterValue; }
1570 void setCounterValue(unsigned V) { CounterValue = V; }
1572 /// \brief Retrieves the module that we're currently building, if any.
1573 Module *getCurrentModule();
1575 /// \brief Allocate a new MacroInfo object with the provided SourceLocation.
1576 MacroInfo *AllocateMacroInfo(SourceLocation L);
1578 /// \brief Allocate a new MacroInfo object loaded from an AST file.
1579 MacroInfo *AllocateDeserializedMacroInfo(SourceLocation L,
1580 unsigned SubModuleID);
1582 /// \brief Turn the specified lexer token into a fully checked and spelled
1583 /// filename, e.g. as an operand of \#include.
1585 /// The caller is expected to provide a buffer that is large enough to hold
1586 /// the spelling of the filename, but is also expected to handle the case
1587 /// when this method decides to use a different buffer.
1589 /// \returns true if the input filename was in <>'s or false if it was
1591 bool GetIncludeFilenameSpelling(SourceLocation Loc,StringRef &Filename);
1593 /// \brief Given a "foo" or \<foo> reference, look up the indicated file.
1595 /// Returns null on failure. \p isAngled indicates whether the file
1596 /// reference is for system \#include's or not (i.e. using <> instead of "").
1597 const FileEntry *LookupFile(SourceLocation FilenameLoc, StringRef Filename,
1598 bool isAngled, const DirectoryLookup *FromDir,
1599 const FileEntry *FromFile,
1600 const DirectoryLookup *&CurDir,
1601 SmallVectorImpl<char> *SearchPath,
1602 SmallVectorImpl<char> *RelativePath,
1603 ModuleMap::KnownHeader *SuggestedModule,
1604 bool SkipCache = false);
1606 /// \brief Get the DirectoryLookup structure used to find the current
1607 /// FileEntry, if CurLexer is non-null and if applicable.
1609 /// This allows us to implement \#include_next and find directory-specific
1611 const DirectoryLookup *GetCurDirLookup() { return CurDirLookup; }
1613 /// \brief Return true if we're in the top-level file, not in a \#include.
1614 bool isInPrimaryFile() const;
1616 /// \brief Handle cases where the \#include name is expanded
1617 /// from a macro as multiple tokens, which need to be glued together.
1619 /// This occurs for code like:
1621 /// \#define FOO <x/y.h>
1624 /// because in this case, "<x/y.h>" is returned as 7 tokens, not one.
1626 /// This code concatenates and consumes tokens up to the '>' token. It
1627 /// returns false if the > was found, otherwise it returns true if it finds
1628 /// and consumes the EOD marker.
1629 bool ConcatenateIncludeName(SmallString<128> &FilenameBuffer,
1630 SourceLocation &End);
1632 /// \brief Lex an on-off-switch (C99 6.10.6p2) and verify that it is
1633 /// followed by EOD. Return true if the token is not a valid on-off-switch.
1634 bool LexOnOffSwitch(tok::OnOffSwitch &OOS);
1636 bool CheckMacroName(Token &MacroNameTok, MacroUse isDefineUndef,
1637 bool *ShadowFlag = nullptr);
1641 void PushIncludeMacroStack() {
1642 assert(CurLexerKind != CLK_CachingLexer && "cannot push a caching lexer");
1643 IncludeMacroStack.emplace_back(
1644 CurLexerKind, CurSubmodule, std::move(CurLexer), std::move(CurPTHLexer),
1645 CurPPLexer, std::move(CurTokenLexer), CurDirLookup);
1646 CurPPLexer = nullptr;
1649 void PopIncludeMacroStack() {
1650 CurLexer = std::move(IncludeMacroStack.back().TheLexer);
1651 CurPTHLexer = std::move(IncludeMacroStack.back().ThePTHLexer);
1652 CurPPLexer = IncludeMacroStack.back().ThePPLexer;
1653 CurTokenLexer = std::move(IncludeMacroStack.back().TheTokenLexer);
1654 CurDirLookup = IncludeMacroStack.back().TheDirLookup;
1655 CurSubmodule = IncludeMacroStack.back().TheSubmodule;
1656 CurLexerKind = IncludeMacroStack.back().CurLexerKind;
1657 IncludeMacroStack.pop_back();
1660 void PropagateLineStartLeadingSpaceInfo(Token &Result);
1662 void EnterSubmodule(Module *M, SourceLocation ImportLoc);
1663 void LeaveSubmodule();
1665 /// Update the set of active module macros and ambiguity flag for a module
1667 void updateModuleMacroInfo(const IdentifierInfo *II, ModuleMacroInfo &Info);
1669 /// \brief Allocate a new MacroInfo object.
1670 MacroInfo *AllocateMacroInfo();
1672 DefMacroDirective *AllocateDefMacroDirective(MacroInfo *MI,
1673 SourceLocation Loc);
1674 UndefMacroDirective *AllocateUndefMacroDirective(SourceLocation UndefLoc);
1675 VisibilityMacroDirective *AllocateVisibilityMacroDirective(SourceLocation Loc,
1678 /// \brief Lex and validate a macro name, which occurs after a
1679 /// \#define or \#undef.
1681 /// \param MacroNameTok Token that represents the name defined or undefined.
1682 /// \param IsDefineUndef Kind if preprocessor directive.
1683 /// \param ShadowFlag Points to flag that is set if macro name shadows
1686 /// This emits a diagnostic, sets the token kind to eod,
1687 /// and discards the rest of the macro line if the macro name is invalid.
1688 void ReadMacroName(Token &MacroNameTok, MacroUse IsDefineUndef = MU_Other,
1689 bool *ShadowFlag = nullptr);
1691 /// The ( starting an argument list of a macro definition has just been read.
1692 /// Lex the rest of the arguments and the closing ), updating \p MI with
1693 /// what we learn and saving in \p LastTok the last token read.
1694 /// Return true if an error occurs parsing the arg list.
1695 bool ReadMacroDefinitionArgList(MacroInfo *MI, Token& LastTok);
1697 /// We just read a \#if or related directive and decided that the
1698 /// subsequent tokens are in the \#if'd out portion of the
1699 /// file. Lex the rest of the file, until we see an \#endif. If \p
1700 /// FoundNonSkipPortion is true, then we have already emitted code for part of
1701 /// this \#if directive, so \#else/\#elif blocks should never be entered. If
1702 /// \p FoundElse is false, then \#else directives are ok, if not, then we have
1703 /// already seen one so a \#else directive is a duplicate. When this returns,
1704 /// the caller can lex the first valid token.
1705 void SkipExcludedConditionalBlock(SourceLocation IfTokenLoc,
1706 bool FoundNonSkipPortion, bool FoundElse,
1707 SourceLocation ElseLoc = SourceLocation());
1709 /// \brief A fast PTH version of SkipExcludedConditionalBlock.
1710 void PTHSkipExcludedConditionalBlock();
1712 /// \brief Evaluate an integer constant expression that may occur after a
1713 /// \#if or \#elif directive and return it as a bool.
1715 /// If the expression is equivalent to "!defined(X)" return X in IfNDefMacro.
1716 bool EvaluateDirectiveExpression(IdentifierInfo *&IfNDefMacro);
1718 /// \brief Install the standard preprocessor pragmas:
1719 /// \#pragma GCC poison/system_header/dependency and \#pragma once.
1720 void RegisterBuiltinPragmas();
1722 /// \brief Register builtin macros such as __LINE__ with the identifier table.
1723 void RegisterBuiltinMacros();
1725 /// If an identifier token is read that is to be expanded as a macro, handle
1726 /// it and return the next token as 'Tok'. If we lexed a token, return true;
1727 /// otherwise the caller should lex again.
1728 bool HandleMacroExpandedIdentifier(Token &Tok, const MacroDefinition &MD);
1730 /// \brief Cache macro expanded tokens for TokenLexers.
1732 /// Works like a stack; a TokenLexer adds the macro expanded tokens that is
1733 /// going to lex in the cache and when it finishes the tokens are removed
1734 /// from the end of the cache.
1735 Token *cacheMacroExpandedTokens(TokenLexer *tokLexer,
1736 ArrayRef<Token> tokens);
1737 void removeCachedMacroExpandedTokensOfLastLexer();
1738 friend void TokenLexer::ExpandFunctionArguments();
1740 /// Determine whether the next preprocessor token to be
1741 /// lexed is a '('. If so, consume the token and return true, if not, this
1742 /// method should have no observable side-effect on the lexed tokens.
1743 bool isNextPPTokenLParen();
1745 /// After reading "MACRO(", this method is invoked to read all of the formal
1746 /// arguments specified for the macro invocation. Returns null on error.
1747 MacroArgs *ReadFunctionLikeMacroArgs(Token &MacroName, MacroInfo *MI,
1748 SourceLocation &ExpansionEnd);
1750 /// \brief If an identifier token is read that is to be expanded
1751 /// as a builtin macro, handle it and return the next token as 'Tok'.
1752 void ExpandBuiltinMacro(Token &Tok);
1754 /// \brief Read a \c _Pragma directive, slice it up, process it, then
1755 /// return the first token after the directive.
1756 /// This assumes that the \c _Pragma token has just been read into \p Tok.
1757 void Handle_Pragma(Token &Tok);
1759 /// \brief Like Handle_Pragma except the pragma text is not enclosed within
1760 /// a string literal.
1761 void HandleMicrosoft__pragma(Token &Tok);
1763 /// \brief Add a lexer to the top of the include stack and
1764 /// start lexing tokens from it instead of the current buffer.
1765 void EnterSourceFileWithLexer(Lexer *TheLexer, const DirectoryLookup *Dir);
1767 /// \brief Add a lexer to the top of the include stack and
1768 /// start getting tokens from it using the PTH cache.
1769 void EnterSourceFileWithPTH(PTHLexer *PL, const DirectoryLookup *Dir);
1771 /// \brief Set the FileID for the preprocessor predefines.
1772 void setPredefinesFileID(FileID FID) {
1773 assert(PredefinesFileID.isInvalid() && "PredefinesFileID already set!");
1774 PredefinesFileID = FID;
1777 /// \brief Returns true if we are lexing from a file and not a
1778 /// pragma or a macro.
1779 static bool IsFileLexer(const Lexer* L, const PreprocessorLexer* P) {
1780 return L ? !L->isPragmaLexer() : P != nullptr;
1783 static bool IsFileLexer(const IncludeStackInfo& I) {
1784 return IsFileLexer(I.TheLexer.get(), I.ThePPLexer);
1787 bool IsFileLexer() const {
1788 return IsFileLexer(CurLexer.get(), CurPPLexer);
1791 //===--------------------------------------------------------------------===//
1793 void CachingLex(Token &Result);
1794 bool InCachingLexMode() const {
1795 // If the Lexer pointers are 0 and IncludeMacroStack is empty, it means
1796 // that we are past EOF, not that we are in CachingLex mode.
1797 return !CurPPLexer && !CurTokenLexer && !CurPTHLexer &&
1798 !IncludeMacroStack.empty();
1800 void EnterCachingLexMode();
1801 void ExitCachingLexMode() {
1802 if (InCachingLexMode())
1803 RemoveTopOfLexerStack();
1805 const Token &PeekAhead(unsigned N);
1806 void AnnotatePreviousCachedTokens(const Token &Tok);
1808 //===--------------------------------------------------------------------===//
1809 /// Handle*Directive - implement the various preprocessor directives. These
1810 /// should side-effect the current preprocessor object so that the next call
1811 /// to Lex() will return the appropriate token next.
1812 void HandleLineDirective(Token &Tok);
1813 void HandleDigitDirective(Token &Tok);
1814 void HandleUserDiagnosticDirective(Token &Tok, bool isWarning);
1815 void HandleIdentSCCSDirective(Token &Tok);
1816 void HandleMacroPublicDirective(Token &Tok);
1817 void HandleMacroPrivateDirective(Token &Tok);
1820 void HandleIncludeDirective(SourceLocation HashLoc,
1822 const DirectoryLookup *LookupFrom = nullptr,
1823 const FileEntry *LookupFromFile = nullptr,
1824 bool isImport = false);
1825 void HandleIncludeNextDirective(SourceLocation HashLoc, Token &Tok);
1826 void HandleIncludeMacrosDirective(SourceLocation HashLoc, Token &Tok);
1827 void HandleImportDirective(SourceLocation HashLoc, Token &Tok);
1828 void HandleMicrosoftImportDirective(Token &Tok);
1831 // Module inclusion testing.
1832 /// \brief Find the module that owns the source or header file that
1833 /// \p Loc points to. If the location is in a file that was included
1834 /// into a module, or is outside any module, returns nullptr.
1835 Module *getModuleForLocation(SourceLocation Loc);
1837 /// \brief Find the module that contains the specified location, either
1838 /// directly or indirectly.
1839 Module *getModuleContainingLocation(SourceLocation Loc);
1843 void HandleDefineDirective(Token &Tok, bool ImmediatelyAfterTopLevelIfndef);
1844 void HandleUndefDirective(Token &Tok);
1846 // Conditional Inclusion.
1847 void HandleIfdefDirective(Token &Tok, bool isIfndef,
1848 bool ReadAnyTokensBeforeDirective);
1849 void HandleIfDirective(Token &Tok, bool ReadAnyTokensBeforeDirective);
1850 void HandleEndifDirective(Token &Tok);
1851 void HandleElseDirective(Token &Tok);
1852 void HandleElifDirective(Token &Tok);
1855 void HandlePragmaDirective(SourceLocation IntroducerLoc,
1856 PragmaIntroducerKind Introducer);
1858 void HandlePragmaOnce(Token &OnceTok);
1859 void HandlePragmaMark();
1860 void HandlePragmaPoison(Token &PoisonTok);
1861 void HandlePragmaSystemHeader(Token &SysHeaderTok);
1862 void HandlePragmaDependency(Token &DependencyTok);
1863 void HandlePragmaPushMacro(Token &Tok);
1864 void HandlePragmaPopMacro(Token &Tok);
1865 void HandlePragmaIncludeAlias(Token &Tok);
1866 IdentifierInfo *ParsePragmaPushOrPopMacro(Token &Tok);
1868 // Return true and store the first token only if any CommentHandler
1869 // has inserted some tokens and getCommentRetentionState() is false.
1870 bool HandleComment(Token &Token, SourceRange Comment);
1872 /// \brief A macro is used, update information about macros that need unused
1874 void markMacroAsUsed(MacroInfo *MI);
1877 /// \brief Abstract base class that describes a handler that will receive
1878 /// source ranges for each of the comments encountered in the source file.
1879 class CommentHandler {
1881 virtual ~CommentHandler();
1883 // The handler shall return true if it has pushed any tokens
1884 // to be read using e.g. EnterToken or EnterTokenStream.
1885 virtual bool HandleComment(Preprocessor &PP, SourceRange Comment) = 0;
1888 } // end namespace clang