1 //===--- MacroExpansion.cpp - Top level Macro Expansion -------------------===//
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 //===----------------------------------------------------------------------===//
10 // This file implements the top level handling of macro expansion for the
13 //===----------------------------------------------------------------------===//
15 #include "clang/Basic/Attributes.h"
16 #include "clang/Basic/FileManager.h"
17 #include "clang/Basic/IdentifierTable.h"
18 #include "clang/Basic/LLVM.h"
19 #include "clang/Basic/LangOptions.h"
20 #include "clang/Basic/ObjCRuntime.h"
21 #include "clang/Basic/SourceLocation.h"
22 #include "clang/Basic/TargetInfo.h"
23 #include "clang/Lex/CodeCompletionHandler.h"
24 #include "clang/Lex/DirectoryLookup.h"
25 #include "clang/Lex/ExternalPreprocessorSource.h"
26 #include "clang/Lex/LexDiagnostic.h"
27 #include "clang/Lex/MacroArgs.h"
28 #include "clang/Lex/MacroInfo.h"
29 #include "clang/Lex/Preprocessor.h"
30 #include "clang/Lex/PreprocessorLexer.h"
31 #include "clang/Lex/PTHLexer.h"
32 #include "clang/Lex/Token.h"
33 #include "llvm/ADT/ArrayRef.h"
34 #include "llvm/ADT/DenseMap.h"
35 #include "llvm/ADT/DenseSet.h"
36 #include "llvm/ADT/FoldingSet.h"
37 #include "llvm/ADT/None.h"
38 #include "llvm/ADT/Optional.h"
39 #include "llvm/ADT/SmallString.h"
40 #include "llvm/ADT/SmallVector.h"
41 #include "llvm/ADT/STLExtras.h"
42 #include "llvm/ADT/StringRef.h"
43 #include "llvm/ADT/StringSwitch.h"
44 #include "llvm/Config/llvm-config.h"
45 #include "llvm/Support/Casting.h"
46 #include "llvm/Support/ErrorHandling.h"
47 #include "llvm/Support/Format.h"
48 #include "llvm/Support/raw_ostream.h"
58 using namespace clang;
61 Preprocessor::getLocalMacroDirectiveHistory(const IdentifierInfo *II) const {
62 if (!II->hadMacroDefinition())
64 auto Pos = CurSubmoduleState->Macros.find(II);
65 return Pos == CurSubmoduleState->Macros.end() ? nullptr
66 : Pos->second.getLatest();
69 void Preprocessor::appendMacroDirective(IdentifierInfo *II, MacroDirective *MD){
70 assert(MD && "MacroDirective should be non-zero!");
71 assert(!MD->getPrevious() && "Already attached to a MacroDirective history.");
73 MacroState &StoredMD = CurSubmoduleState->Macros[II];
74 auto *OldMD = StoredMD.getLatest();
75 MD->setPrevious(OldMD);
76 StoredMD.setLatest(MD);
77 StoredMD.overrideActiveModuleMacros(*this, II);
79 if (needModuleMacros()) {
80 // Track that we created a new macro directive, so we know we should
81 // consider building a ModuleMacro for it when we get to the end of
83 PendingModuleMacroNames.push_back(II);
86 // Set up the identifier as having associated macro history.
87 II->setHasMacroDefinition(true);
88 if (!MD->isDefined() && LeafModuleMacros.find(II) == LeafModuleMacros.end())
89 II->setHasMacroDefinition(false);
91 II->setChangedSinceDeserialization();
94 void Preprocessor::setLoadedMacroDirective(IdentifierInfo *II,
97 // Normally, when a macro is defined, it goes through appendMacroDirective()
98 // above, which chains a macro to previous defines, undefs, etc.
99 // However, in a pch, the whole macro history up to the end of the pch is
100 // stored, so ASTReader goes through this function instead.
101 // However, built-in macros are already registered in the Preprocessor
102 // ctor, and ASTWriter stops writing the macro chain at built-in macros,
103 // so in that case the chain from the pch needs to be spliced to the existing
107 MacroState &StoredMD = CurSubmoduleState->Macros[II];
109 if (auto *OldMD = StoredMD.getLatest()) {
110 // shouldIgnoreMacro() in ASTWriter also stops at macros from the
111 // predefines buffer in module builds. However, in module builds, modules
112 // are loaded completely before predefines are processed, so StoredMD
113 // will be nullptr for them when they're loaded. StoredMD should only be
114 // non-nullptr for builtins read from a pch file.
115 assert(OldMD->getMacroInfo()->isBuiltinMacro() &&
116 "only built-ins should have an entry here");
117 assert(!OldMD->getPrevious() && "builtin should only have a single entry");
118 ED->setPrevious(OldMD);
119 StoredMD.setLatest(MD);
124 // Setup the identifier as having associated macro history.
125 II->setHasMacroDefinition(true);
126 if (!MD->isDefined() && LeafModuleMacros.find(II) == LeafModuleMacros.end())
127 II->setHasMacroDefinition(false);
130 ModuleMacro *Preprocessor::addModuleMacro(Module *Mod, IdentifierInfo *II,
132 ArrayRef<ModuleMacro *> Overrides,
134 llvm::FoldingSetNodeID ID;
135 ModuleMacro::Profile(ID, Mod, II);
138 if (auto *MM = ModuleMacros.FindNodeOrInsertPos(ID, InsertPos)) {
143 auto *MM = ModuleMacro::create(*this, Mod, II, Macro, Overrides);
144 ModuleMacros.InsertNode(MM, InsertPos);
146 // Each overridden macro is now overridden by one more macro.
148 for (auto *O : Overrides) {
149 HidAny |= (O->NumOverriddenBy == 0);
150 ++O->NumOverriddenBy;
153 // If we were the first overrider for any macro, it's no longer a leaf.
154 auto &LeafMacros = LeafModuleMacros[II];
156 LeafMacros.erase(std::remove_if(LeafMacros.begin(), LeafMacros.end(),
157 [](ModuleMacro *MM) {
158 return MM->NumOverriddenBy != 0;
163 // The new macro is always a leaf macro.
164 LeafMacros.push_back(MM);
165 // The identifier now has defined macros (that may or may not be visible).
166 II->setHasMacroDefinition(true);
172 ModuleMacro *Preprocessor::getModuleMacro(Module *Mod, IdentifierInfo *II) {
173 llvm::FoldingSetNodeID ID;
174 ModuleMacro::Profile(ID, Mod, II);
177 return ModuleMacros.FindNodeOrInsertPos(ID, InsertPos);
180 void Preprocessor::updateModuleMacroInfo(const IdentifierInfo *II,
181 ModuleMacroInfo &Info) {
182 assert(Info.ActiveModuleMacrosGeneration !=
183 CurSubmoduleState->VisibleModules.getGeneration() &&
184 "don't need to update this macro name info");
185 Info.ActiveModuleMacrosGeneration =
186 CurSubmoduleState->VisibleModules.getGeneration();
188 auto Leaf = LeafModuleMacros.find(II);
189 if (Leaf == LeafModuleMacros.end()) {
190 // No imported macros at all: nothing to do.
194 Info.ActiveModuleMacros.clear();
196 // Every macro that's locally overridden is overridden by a visible macro.
197 llvm::DenseMap<ModuleMacro *, int> NumHiddenOverrides;
198 for (auto *O : Info.OverriddenMacros)
199 NumHiddenOverrides[O] = -1;
201 // Collect all macros that are not overridden by a visible macro.
202 llvm::SmallVector<ModuleMacro *, 16> Worklist;
203 for (auto *LeafMM : Leaf->second) {
204 assert(LeafMM->getNumOverridingMacros() == 0 && "leaf macro overridden");
205 if (NumHiddenOverrides.lookup(LeafMM) == 0)
206 Worklist.push_back(LeafMM);
208 while (!Worklist.empty()) {
209 auto *MM = Worklist.pop_back_val();
210 if (CurSubmoduleState->VisibleModules.isVisible(MM->getOwningModule())) {
211 // We only care about collecting definitions; undefinitions only act
212 // to override other definitions.
213 if (MM->getMacroInfo())
214 Info.ActiveModuleMacros.push_back(MM);
216 for (auto *O : MM->overrides())
217 if ((unsigned)++NumHiddenOverrides[O] == O->getNumOverridingMacros())
218 Worklist.push_back(O);
221 // Our reverse postorder walk found the macros in reverse order.
222 std::reverse(Info.ActiveModuleMacros.begin(), Info.ActiveModuleMacros.end());
224 // Determine whether the macro name is ambiguous.
225 MacroInfo *MI = nullptr;
226 bool IsSystemMacro = true;
227 bool IsAmbiguous = false;
228 if (auto *MD = Info.MD) {
229 while (MD && isa<VisibilityMacroDirective>(MD))
230 MD = MD->getPrevious();
231 if (auto *DMD = dyn_cast_or_null<DefMacroDirective>(MD)) {
233 IsSystemMacro &= SourceMgr.isInSystemHeader(DMD->getLocation());
236 for (auto *Active : Info.ActiveModuleMacros) {
237 auto *NewMI = Active->getMacroInfo();
239 // Before marking the macro as ambiguous, check if this is a case where
240 // both macros are in system headers. If so, we trust that the system
241 // did not get it wrong. This also handles cases where Clang's own
242 // headers have a different spelling of certain system macros:
243 // #define LONG_MAX __LONG_MAX__ (clang's limits.h)
244 // #define LONG_MAX 0x7fffffffffffffffL (system's limits.h)
246 // FIXME: Remove the defined-in-system-headers check. clang's limits.h
247 // overrides the system limits.h's macros, so there's no conflict here.
248 if (MI && NewMI != MI &&
249 !MI->isIdenticalTo(*NewMI, *this, /*Syntactically=*/true))
251 IsSystemMacro &= Active->getOwningModule()->IsSystem ||
252 SourceMgr.isInSystemHeader(NewMI->getDefinitionLoc());
255 Info.IsAmbiguous = IsAmbiguous && !IsSystemMacro;
258 void Preprocessor::dumpMacroInfo(const IdentifierInfo *II) {
259 ArrayRef<ModuleMacro*> Leaf;
260 auto LeafIt = LeafModuleMacros.find(II);
261 if (LeafIt != LeafModuleMacros.end())
262 Leaf = LeafIt->second;
263 const MacroState *State = nullptr;
264 auto Pos = CurSubmoduleState->Macros.find(II);
265 if (Pos != CurSubmoduleState->Macros.end())
266 State = &Pos->second;
268 llvm::errs() << "MacroState " << State << " " << II->getNameStart();
269 if (State && State->isAmbiguous(*this, II))
270 llvm::errs() << " ambiguous";
271 if (State && !State->getOverriddenMacros().empty()) {
272 llvm::errs() << " overrides";
273 for (auto *O : State->getOverriddenMacros())
274 llvm::errs() << " " << O->getOwningModule()->getFullModuleName();
276 llvm::errs() << "\n";
278 // Dump local macro directives.
279 for (auto *MD = State ? State->getLatest() : nullptr; MD;
280 MD = MD->getPrevious()) {
285 // Dump module macros.
286 llvm::DenseSet<ModuleMacro*> Active;
287 for (auto *MM : State ? State->getActiveModuleMacros(*this, II) : None)
289 llvm::DenseSet<ModuleMacro*> Visited;
290 llvm::SmallVector<ModuleMacro *, 16> Worklist(Leaf.begin(), Leaf.end());
291 while (!Worklist.empty()) {
292 auto *MM = Worklist.pop_back_val();
293 llvm::errs() << " ModuleMacro " << MM << " "
294 << MM->getOwningModule()->getFullModuleName();
295 if (!MM->getMacroInfo())
296 llvm::errs() << " undef";
298 if (Active.count(MM))
299 llvm::errs() << " active";
300 else if (!CurSubmoduleState->VisibleModules.isVisible(
301 MM->getOwningModule()))
302 llvm::errs() << " hidden";
303 else if (MM->getMacroInfo())
304 llvm::errs() << " overridden";
306 if (!MM->overrides().empty()) {
307 llvm::errs() << " overrides";
308 for (auto *O : MM->overrides()) {
309 llvm::errs() << " " << O->getOwningModule()->getFullModuleName();
310 if (Visited.insert(O).second)
311 Worklist.push_back(O);
314 llvm::errs() << "\n";
315 if (auto *MI = MM->getMacroInfo()) {
318 llvm::errs() << "\n";
323 /// RegisterBuiltinMacro - Register the specified identifier in the identifier
324 /// table and mark it as a builtin macro to be expanded.
325 static IdentifierInfo *RegisterBuiltinMacro(Preprocessor &PP, const char *Name){
326 // Get the identifier.
327 IdentifierInfo *Id = PP.getIdentifierInfo(Name);
329 // Mark it as being a macro that is builtin.
330 MacroInfo *MI = PP.AllocateMacroInfo(SourceLocation());
331 MI->setIsBuiltinMacro();
332 PP.appendDefMacroDirective(Id, MI);
336 /// RegisterBuiltinMacros - Register builtin macros, such as __LINE__ with the
337 /// identifier table.
338 void Preprocessor::RegisterBuiltinMacros() {
339 Ident__LINE__ = RegisterBuiltinMacro(*this, "__LINE__");
340 Ident__FILE__ = RegisterBuiltinMacro(*this, "__FILE__");
341 Ident__DATE__ = RegisterBuiltinMacro(*this, "__DATE__");
342 Ident__TIME__ = RegisterBuiltinMacro(*this, "__TIME__");
343 Ident__COUNTER__ = RegisterBuiltinMacro(*this, "__COUNTER__");
344 Ident_Pragma = RegisterBuiltinMacro(*this, "_Pragma");
346 // C++ Standing Document Extensions.
347 if (LangOpts.CPlusPlus)
348 Ident__has_cpp_attribute =
349 RegisterBuiltinMacro(*this, "__has_cpp_attribute");
351 Ident__has_cpp_attribute = nullptr;
354 Ident__BASE_FILE__ = RegisterBuiltinMacro(*this, "__BASE_FILE__");
355 Ident__INCLUDE_LEVEL__ = RegisterBuiltinMacro(*this, "__INCLUDE_LEVEL__");
356 Ident__TIMESTAMP__ = RegisterBuiltinMacro(*this, "__TIMESTAMP__");
358 // Microsoft Extensions.
359 if (LangOpts.MicrosoftExt) {
360 Ident__identifier = RegisterBuiltinMacro(*this, "__identifier");
361 Ident__pragma = RegisterBuiltinMacro(*this, "__pragma");
363 Ident__identifier = nullptr;
364 Ident__pragma = nullptr;
368 Ident__has_feature = RegisterBuiltinMacro(*this, "__has_feature");
369 Ident__has_extension = RegisterBuiltinMacro(*this, "__has_extension");
370 Ident__has_builtin = RegisterBuiltinMacro(*this, "__has_builtin");
371 Ident__has_attribute = RegisterBuiltinMacro(*this, "__has_attribute");
372 Ident__has_declspec = RegisterBuiltinMacro(*this, "__has_declspec_attribute");
373 Ident__has_include = RegisterBuiltinMacro(*this, "__has_include");
374 Ident__has_include_next = RegisterBuiltinMacro(*this, "__has_include_next");
375 Ident__has_warning = RegisterBuiltinMacro(*this, "__has_warning");
376 Ident__is_identifier = RegisterBuiltinMacro(*this, "__is_identifier");
379 Ident__building_module = RegisterBuiltinMacro(*this, "__building_module");
380 if (!LangOpts.CurrentModule.empty())
381 Ident__MODULE__ = RegisterBuiltinMacro(*this, "__MODULE__");
383 Ident__MODULE__ = nullptr;
386 /// isTrivialSingleTokenExpansion - Return true if MI, which has a single token
387 /// in its expansion, currently expands to that token literally.
388 static bool isTrivialSingleTokenExpansion(const MacroInfo *MI,
389 const IdentifierInfo *MacroIdent,
391 IdentifierInfo *II = MI->getReplacementToken(0).getIdentifierInfo();
393 // If the token isn't an identifier, it's always literally expanded.
394 if (!II) return true;
396 // If the information about this identifier is out of date, update it from
397 // the external source.
398 if (II->isOutOfDate())
399 PP.getExternalSource()->updateOutOfDateIdentifier(*II);
401 // If the identifier is a macro, and if that macro is enabled, it may be
402 // expanded so it's not a trivial expansion.
403 if (auto *ExpansionMI = PP.getMacroInfo(II))
404 if (ExpansionMI->isEnabled() &&
405 // Fast expanding "#define X X" is ok, because X would be disabled.
409 // If this is an object-like macro invocation, it is safe to trivially expand
411 if (MI->isObjectLike()) return true;
413 // If this is a function-like macro invocation, it's safe to trivially expand
414 // as long as the identifier is not a macro argument.
415 return std::find(MI->param_begin(), MI->param_end(), II) == MI->param_end();
418 /// isNextPPTokenLParen - Determine whether the next preprocessor token to be
419 /// lexed is a '('. If so, consume the token and return true, if not, this
420 /// method should have no observable side-effect on the lexed tokens.
421 bool Preprocessor::isNextPPTokenLParen() {
422 // Do some quick tests for rejection cases.
425 Val = CurLexer->isNextPPTokenLParen();
426 else if (CurPTHLexer)
427 Val = CurPTHLexer->isNextPPTokenLParen();
429 Val = CurTokenLexer->isNextTokenLParen();
432 // We have run off the end. If it's a source file we don't
433 // examine enclosing ones (C99 5.1.1.2p4). Otherwise walk up the
437 for (const IncludeStackInfo &Entry : llvm::reverse(IncludeMacroStack)) {
439 Val = Entry.TheLexer->isNextPPTokenLParen();
440 else if (Entry.ThePTHLexer)
441 Val = Entry.ThePTHLexer->isNextPPTokenLParen();
443 Val = Entry.TheTokenLexer->isNextTokenLParen();
448 // Ran off the end of a source file?
449 if (Entry.ThePPLexer)
454 // Okay, if we know that the token is a '(', lex it and return. Otherwise we
455 // have found something that isn't a '(' or we found the end of the
456 // translation unit. In either case, return false.
460 /// HandleMacroExpandedIdentifier - If an identifier token is read that is to be
461 /// expanded as a macro, handle it and return the next token as 'Identifier'.
462 bool Preprocessor::HandleMacroExpandedIdentifier(Token &Identifier,
463 const MacroDefinition &M) {
464 MacroInfo *MI = M.getMacroInfo();
466 // If this is a macro expansion in the "#if !defined(x)" line for the file,
467 // then the macro could expand to different things in other contexts, we need
468 // to disable the optimization in this case.
469 if (CurPPLexer) CurPPLexer->MIOpt.ExpandedMacro();
471 // If this is a builtin macro, like __LINE__ or _Pragma, handle it specially.
472 if (MI->isBuiltinMacro()) {
474 Callbacks->MacroExpands(Identifier, M, Identifier.getLocation(),
476 ExpandBuiltinMacro(Identifier);
480 /// Args - If this is a function-like macro expansion, this contains,
481 /// for each macro argument, the list of tokens that were provided to the
483 MacroArgs *Args = nullptr;
485 // Remember where the end of the expansion occurred. For an object-like
486 // macro, this is the identifier. For a function-like macro, this is the ')'.
487 SourceLocation ExpansionEnd = Identifier.getLocation();
489 // If this is a function-like macro, read the arguments.
490 if (MI->isFunctionLike()) {
491 // Remember that we are now parsing the arguments to a macro invocation.
492 // Preprocessor directives used inside macro arguments are not portable, and
493 // this enables the warning.
495 Args = ReadMacroCallArgumentList(Identifier, MI, ExpansionEnd);
497 // Finished parsing args.
500 // If there was an error parsing the arguments, bail out.
501 if (!Args) return true;
503 ++NumFnMacroExpanded;
508 // Notice that this macro has been used.
511 // Remember where the token is expanded.
512 SourceLocation ExpandLoc = Identifier.getLocation();
513 SourceRange ExpansionRange(ExpandLoc, ExpansionEnd);
517 // We can have macro expansion inside a conditional directive while
518 // reading the function macro arguments. To ensure, in that case, that
519 // MacroExpands callbacks still happen in source order, queue this
520 // callback to have it happen after the function macro callback.
521 DelayedMacroExpandsCallbacks.push_back(
522 MacroExpandsInfo(Identifier, M, ExpansionRange));
524 Callbacks->MacroExpands(Identifier, M, ExpansionRange, Args);
525 if (!DelayedMacroExpandsCallbacks.empty()) {
526 for (const MacroExpandsInfo &Info : DelayedMacroExpandsCallbacks) {
527 // FIXME: We lose macro args info with delayed callback.
528 Callbacks->MacroExpands(Info.Tok, Info.MD, Info.Range,
531 DelayedMacroExpandsCallbacks.clear();
536 // If the macro definition is ambiguous, complain.
537 if (M.isAmbiguous()) {
538 Diag(Identifier, diag::warn_pp_ambiguous_macro)
539 << Identifier.getIdentifierInfo();
540 Diag(MI->getDefinitionLoc(), diag::note_pp_ambiguous_macro_chosen)
541 << Identifier.getIdentifierInfo();
542 M.forAllDefinitions([&](const MacroInfo *OtherMI) {
544 Diag(OtherMI->getDefinitionLoc(), diag::note_pp_ambiguous_macro_other)
545 << Identifier.getIdentifierInfo();
549 // If we started lexing a macro, enter the macro expansion body.
551 // If this macro expands to no tokens, don't bother to push it onto the
552 // expansion stack, only to take it right back off.
553 if (MI->getNumTokens() == 0) {
554 // No need for arg info.
555 if (Args) Args->destroy(*this);
557 // Propagate whitespace info as if we had pushed, then popped,
559 Identifier.setFlag(Token::LeadingEmptyMacro);
560 PropagateLineStartLeadingSpaceInfo(Identifier);
561 ++NumFastMacroExpanded;
563 } else if (MI->getNumTokens() == 1 &&
564 isTrivialSingleTokenExpansion(MI, Identifier.getIdentifierInfo(),
566 // Otherwise, if this macro expands into a single trivially-expanded
567 // token: expand it now. This handles common cases like
570 // No need for arg info.
571 if (Args) Args->destroy(*this);
573 // Propagate the isAtStartOfLine/hasLeadingSpace markers of the macro
574 // identifier to the expanded token.
575 bool isAtStartOfLine = Identifier.isAtStartOfLine();
576 bool hasLeadingSpace = Identifier.hasLeadingSpace();
578 // Replace the result token.
579 Identifier = MI->getReplacementToken(0);
581 // Restore the StartOfLine/LeadingSpace markers.
582 Identifier.setFlagValue(Token::StartOfLine , isAtStartOfLine);
583 Identifier.setFlagValue(Token::LeadingSpace, hasLeadingSpace);
585 // Update the tokens location to include both its expansion and physical
588 SourceMgr.createExpansionLoc(Identifier.getLocation(), ExpandLoc,
589 ExpansionEnd,Identifier.getLength());
590 Identifier.setLocation(Loc);
592 // If this is a disabled macro or #define X X, we must mark the result as
594 if (IdentifierInfo *NewII = Identifier.getIdentifierInfo()) {
595 if (MacroInfo *NewMI = getMacroInfo(NewII))
596 if (!NewMI->isEnabled() || NewMI == MI) {
597 Identifier.setFlag(Token::DisableExpand);
598 // Don't warn for "#define X X" like "#define bool bool" from
600 if (NewMI != MI || MI->isFunctionLike())
601 Diag(Identifier, diag::pp_disabled_macro_expansion);
605 // Since this is not an identifier token, it can't be macro expanded, so
607 ++NumFastMacroExpanded;
611 // Start expanding the macro.
612 EnterMacro(Identifier, ExpansionEnd, MI, Args);
621 /// CheckMatchedBrackets - Returns true if the braces and parentheses in the
622 /// token vector are properly nested.
623 static bool CheckMatchedBrackets(const SmallVectorImpl<Token> &Tokens) {
624 SmallVector<Bracket, 8> Brackets;
625 for (SmallVectorImpl<Token>::const_iterator I = Tokens.begin(),
628 if (I->is(tok::l_paren)) {
629 Brackets.push_back(Paren);
630 } else if (I->is(tok::r_paren)) {
631 if (Brackets.empty() || Brackets.back() == Brace)
634 } else if (I->is(tok::l_brace)) {
635 Brackets.push_back(Brace);
636 } else if (I->is(tok::r_brace)) {
637 if (Brackets.empty() || Brackets.back() == Paren)
642 return Brackets.empty();
645 /// GenerateNewArgTokens - Returns true if OldTokens can be converted to a new
646 /// vector of tokens in NewTokens. The new number of arguments will be placed
647 /// in NumArgs and the ranges which need to surrounded in parentheses will be
649 /// Returns false if the token stream cannot be changed. If this is because
650 /// of an initializer list starting a macro argument, the range of those
651 /// initializer lists will be place in InitLists.
652 static bool GenerateNewArgTokens(Preprocessor &PP,
653 SmallVectorImpl<Token> &OldTokens,
654 SmallVectorImpl<Token> &NewTokens,
656 SmallVectorImpl<SourceRange> &ParenHints,
657 SmallVectorImpl<SourceRange> &InitLists) {
658 if (!CheckMatchedBrackets(OldTokens))
661 // Once it is known that the brackets are matched, only a simple count of the
665 // First token of a new macro argument.
666 SmallVectorImpl<Token>::iterator ArgStartIterator = OldTokens.begin();
668 // First closing brace in a new macro argument. Used to generate
669 // SourceRanges for InitLists.
670 SmallVectorImpl<Token>::iterator ClosingBrace = OldTokens.end();
673 // Set to true when a macro separator token is found inside a braced list.
674 // If true, the fixed argument spans multiple old arguments and ParenHints
676 bool FoundSeparatorToken = false;
677 for (SmallVectorImpl<Token>::iterator I = OldTokens.begin(),
680 if (I->is(tok::l_brace)) {
682 } else if (I->is(tok::r_brace)) {
684 if (Braces == 0 && ClosingBrace == E && FoundSeparatorToken)
686 } else if (I->is(tok::eof)) {
687 // EOF token is used to separate macro arguments
689 // Assume comma separator is actually braced list separator and change
690 // it back to a comma.
691 FoundSeparatorToken = true;
692 I->setKind(tok::comma);
694 } else { // Braces == 0
695 // Separator token still separates arguments.
698 // If the argument starts with a brace, it can't be fixed with
699 // parentheses. A different diagnostic will be given.
700 if (FoundSeparatorToken && ArgStartIterator->is(tok::l_brace)) {
702 SourceRange(ArgStartIterator->getLocation(),
703 PP.getLocForEndOfToken(ClosingBrace->getLocation())));
708 if (FoundSeparatorToken) {
709 TempToken.startToken();
710 TempToken.setKind(tok::l_paren);
711 TempToken.setLocation(ArgStartIterator->getLocation());
712 TempToken.setLength(0);
713 NewTokens.push_back(TempToken);
716 // Copy over argument tokens
717 NewTokens.insert(NewTokens.end(), ArgStartIterator, I);
719 // Add right paren and store the paren locations in ParenHints
720 if (FoundSeparatorToken) {
721 SourceLocation Loc = PP.getLocForEndOfToken((I - 1)->getLocation());
722 TempToken.startToken();
723 TempToken.setKind(tok::r_paren);
724 TempToken.setLocation(Loc);
725 TempToken.setLength(0);
726 NewTokens.push_back(TempToken);
727 ParenHints.push_back(SourceRange(ArgStartIterator->getLocation(),
731 // Copy separator token
732 NewTokens.push_back(*I);
735 ArgStartIterator = I + 1;
736 FoundSeparatorToken = false;
741 return !ParenHints.empty() && InitLists.empty();
744 /// ReadFunctionLikeMacroArgs - After reading "MACRO" and knowing that the next
745 /// token is the '(' of the macro, this method is invoked to read all of the
746 /// actual arguments specified for the macro invocation. This returns null on
748 MacroArgs *Preprocessor::ReadMacroCallArgumentList(Token &MacroName,
750 SourceLocation &MacroEnd) {
751 // The number of fixed arguments to parse.
752 unsigned NumFixedArgsLeft = MI->getNumParams();
753 bool isVariadic = MI->isVariadic();
755 // Outer loop, while there are more arguments, keep reading them.
758 // Read arguments as unexpanded tokens. This avoids issues, e.g., where
759 // an argument value in a macro could expand to ',' or '(' or ')'.
760 LexUnexpandedToken(Tok);
761 assert(Tok.is(tok::l_paren) && "Error computing l-paren-ness?");
763 // ArgTokens - Build up a list of tokens that make up each argument. Each
764 // argument is separated by an EOF token. Use a SmallVector so we can avoid
765 // heap allocations in the common case.
766 SmallVector<Token, 64> ArgTokens;
767 bool ContainsCodeCompletionTok = false;
768 bool FoundElidedComma = false;
770 SourceLocation TooManyArgsLoc;
772 unsigned NumActuals = 0;
773 while (Tok.isNot(tok::r_paren)) {
774 if (ContainsCodeCompletionTok && Tok.isOneOf(tok::eof, tok::eod))
777 assert(Tok.isOneOf(tok::l_paren, tok::comma) &&
778 "only expect argument separators here");
780 size_t ArgTokenStart = ArgTokens.size();
781 SourceLocation ArgStartLoc = Tok.getLocation();
783 // C99 6.10.3p11: Keep track of the number of l_parens we have seen. Note
784 // that we already consumed the first one.
785 unsigned NumParens = 0;
788 // Read arguments as unexpanded tokens. This avoids issues, e.g., where
789 // an argument value in a macro could expand to ',' or '(' or ')'.
790 LexUnexpandedToken(Tok);
792 if (Tok.isOneOf(tok::eof, tok::eod)) { // "#if f(<eof>" & "#if f(\n"
793 if (!ContainsCodeCompletionTok) {
794 Diag(MacroName, diag::err_unterm_macro_invoc);
795 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
796 << MacroName.getIdentifierInfo();
797 // Do not lose the EOF/EOD. Return it to the client.
801 // Do not lose the EOF/EOD.
802 auto Toks = llvm::make_unique<Token[]>(1);
804 EnterTokenStream(std::move(Toks), 1, true);
806 } else if (Tok.is(tok::r_paren)) {
807 // If we found the ) token, the macro arg list is done.
808 if (NumParens-- == 0) {
809 MacroEnd = Tok.getLocation();
810 if (!ArgTokens.empty() &&
811 ArgTokens.back().commaAfterElided()) {
812 FoundElidedComma = true;
816 } else if (Tok.is(tok::l_paren)) {
818 } else if (Tok.is(tok::comma) && NumParens == 0 &&
819 !(Tok.getFlags() & Token::IgnoredComma)) {
820 // In Microsoft-compatibility mode, single commas from nested macro
821 // expansions should not be considered as argument separators. We test
822 // for this with the IgnoredComma token flag above.
824 // Comma ends this argument if there are more fixed arguments expected.
825 // However, if this is a variadic macro, and this is part of the
826 // variadic part, then the comma is just an argument token.
827 if (!isVariadic) break;
828 if (NumFixedArgsLeft > 1)
830 } else if (Tok.is(tok::comment) && !KeepMacroComments) {
831 // If this is a comment token in the argument list and we're just in
832 // -C mode (not -CC mode), discard the comment.
834 } else if (!Tok.isAnnotation() && Tok.getIdentifierInfo() != nullptr) {
835 // Reading macro arguments can cause macros that we are currently
836 // expanding from to be popped off the expansion stack. Doing so causes
837 // them to be reenabled for expansion. Here we record whether any
838 // identifiers we lex as macro arguments correspond to disabled macros.
839 // If so, we mark the token as noexpand. This is a subtle aspect of
841 if (MacroInfo *MI = getMacroInfo(Tok.getIdentifierInfo()))
842 if (!MI->isEnabled())
843 Tok.setFlag(Token::DisableExpand);
844 } else if (Tok.is(tok::code_completion)) {
845 ContainsCodeCompletionTok = true;
847 CodeComplete->CodeCompleteMacroArgument(MacroName.getIdentifierInfo(),
849 // Don't mark that we reached the code-completion point because the
850 // parser is going to handle the token and there will be another
851 // code-completion callback.
854 ArgTokens.push_back(Tok);
857 // If this was an empty argument list foo(), don't add this as an empty
859 if (ArgTokens.empty() && Tok.getKind() == tok::r_paren)
862 // If this is not a variadic macro, and too many args were specified, emit
864 if (!isVariadic && NumFixedArgsLeft == 0 && TooManyArgsLoc.isInvalid()) {
865 if (ArgTokens.size() != ArgTokenStart)
866 TooManyArgsLoc = ArgTokens[ArgTokenStart].getLocation();
868 TooManyArgsLoc = ArgStartLoc;
871 // Empty arguments are standard in C99 and C++0x, and are supported as an
872 // extension in other modes.
873 if (ArgTokens.size() == ArgTokenStart && !LangOpts.C99)
874 Diag(Tok, LangOpts.CPlusPlus11 ?
875 diag::warn_cxx98_compat_empty_fnmacro_arg :
876 diag::ext_empty_fnmacro_arg);
878 // Add a marker EOF token to the end of the token list for this argument.
881 EOFTok.setKind(tok::eof);
882 EOFTok.setLocation(Tok.getLocation());
884 ArgTokens.push_back(EOFTok);
886 if (!ContainsCodeCompletionTok && NumFixedArgsLeft != 0)
890 // Okay, we either found the r_paren. Check to see if we parsed too few
892 unsigned MinArgsExpected = MI->getNumParams();
894 // If this is not a variadic macro, and too many args were specified, emit
896 if (!isVariadic && NumActuals > MinArgsExpected &&
897 !ContainsCodeCompletionTok) {
898 // Emit the diagnostic at the macro name in case there is a missing ).
899 // Emitting it at the , could be far away from the macro name.
900 Diag(TooManyArgsLoc, diag::err_too_many_args_in_macro_invoc);
901 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
902 << MacroName.getIdentifierInfo();
904 // Commas from braced initializer lists will be treated as argument
905 // separators inside macros. Attempt to correct for this with parentheses.
906 // TODO: See if this can be generalized to angle brackets for templates
907 // inside macro arguments.
909 SmallVector<Token, 4> FixedArgTokens;
910 unsigned FixedNumArgs = 0;
911 SmallVector<SourceRange, 4> ParenHints, InitLists;
912 if (!GenerateNewArgTokens(*this, ArgTokens, FixedArgTokens, FixedNumArgs,
913 ParenHints, InitLists)) {
914 if (!InitLists.empty()) {
915 DiagnosticBuilder DB =
917 diag::note_init_list_at_beginning_of_macro_argument);
918 for (SourceRange Range : InitLists)
923 if (FixedNumArgs != MinArgsExpected)
926 DiagnosticBuilder DB = Diag(MacroName, diag::note_suggest_parens_for_macro);
927 for (SourceRange ParenLocation : ParenHints) {
928 DB << FixItHint::CreateInsertion(ParenLocation.getBegin(), "(");
929 DB << FixItHint::CreateInsertion(ParenLocation.getEnd(), ")");
931 ArgTokens.swap(FixedArgTokens);
932 NumActuals = FixedNumArgs;
935 // See MacroArgs instance var for description of this.
936 bool isVarargsElided = false;
938 if (ContainsCodeCompletionTok) {
939 // Recover from not-fully-formed macro invocation during code-completion.
942 EOFTok.setKind(tok::eof);
943 EOFTok.setLocation(Tok.getLocation());
945 for (; NumActuals < MinArgsExpected; ++NumActuals)
946 ArgTokens.push_back(EOFTok);
949 if (NumActuals < MinArgsExpected) {
950 // There are several cases where too few arguments is ok, handle them now.
951 if (NumActuals == 0 && MinArgsExpected == 1) {
952 // #define A(X) or #define A(...) ---> A()
954 // If there is exactly one argument, and that argument is missing,
955 // then we have an empty "()" argument empty list. This is fine, even if
956 // the macro expects one argument (the argument is just empty).
957 isVarargsElided = MI->isVariadic();
958 } else if ((FoundElidedComma || MI->isVariadic()) &&
959 (NumActuals+1 == MinArgsExpected || // A(x, ...) -> A(X)
960 (NumActuals == 0 && MinArgsExpected == 2))) {// A(x,...) -> A()
961 // Varargs where the named vararg parameter is missing: OK as extension.
965 // If the macro contains the comma pasting extension, the diagnostic
966 // is suppressed; we know we'll get another diagnostic later.
967 if (!MI->hasCommaPasting()) {
968 Diag(Tok, diag::ext_missing_varargs_arg);
969 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
970 << MacroName.getIdentifierInfo();
973 // Remember this occurred, allowing us to elide the comma when used for
975 // #define A(x, foo...) blah(a, ## foo)
976 // #define B(x, ...) blah(a, ## __VA_ARGS__)
977 // #define C(...) blah(a, ## __VA_ARGS__)
979 isVarargsElided = true;
980 } else if (!ContainsCodeCompletionTok) {
981 // Otherwise, emit the error.
982 Diag(Tok, diag::err_too_few_args_in_macro_invoc);
983 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
984 << MacroName.getIdentifierInfo();
988 // Add a marker EOF token to the end of the token list for this argument.
989 SourceLocation EndLoc = Tok.getLocation();
991 Tok.setKind(tok::eof);
992 Tok.setLocation(EndLoc);
994 ArgTokens.push_back(Tok);
996 // If we expect two arguments, add both as empty.
997 if (NumActuals == 0 && MinArgsExpected == 2)
998 ArgTokens.push_back(Tok);
1000 } else if (NumActuals > MinArgsExpected && !MI->isVariadic() &&
1001 !ContainsCodeCompletionTok) {
1002 // Emit the diagnostic at the macro name in case there is a missing ).
1003 // Emitting it at the , could be far away from the macro name.
1004 Diag(MacroName, diag::err_too_many_args_in_macro_invoc);
1005 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
1006 << MacroName.getIdentifierInfo();
1010 return MacroArgs::create(MI, ArgTokens, isVarargsElided, *this);
1013 /// \brief Keeps macro expanded tokens for TokenLexers.
1015 /// Works like a stack; a TokenLexer adds the macro expanded tokens that is
1016 /// going to lex in the cache and when it finishes the tokens are removed
1017 /// from the end of the cache.
1018 Token *Preprocessor::cacheMacroExpandedTokens(TokenLexer *tokLexer,
1019 ArrayRef<Token> tokens) {
1024 size_t newIndex = MacroExpandedTokens.size();
1025 bool cacheNeedsToGrow = tokens.size() >
1026 MacroExpandedTokens.capacity()-MacroExpandedTokens.size();
1027 MacroExpandedTokens.append(tokens.begin(), tokens.end());
1029 if (cacheNeedsToGrow) {
1030 // Go through all the TokenLexers whose 'Tokens' pointer points in the
1031 // buffer and update the pointers to the (potential) new buffer array.
1032 for (const auto &Lexer : MacroExpandingLexersStack) {
1033 TokenLexer *prevLexer;
1035 std::tie(prevLexer, tokIndex) = Lexer;
1036 prevLexer->Tokens = MacroExpandedTokens.data() + tokIndex;
1040 MacroExpandingLexersStack.push_back(std::make_pair(tokLexer, newIndex));
1041 return MacroExpandedTokens.data() + newIndex;
1044 void Preprocessor::removeCachedMacroExpandedTokensOfLastLexer() {
1045 assert(!MacroExpandingLexersStack.empty());
1046 size_t tokIndex = MacroExpandingLexersStack.back().second;
1047 assert(tokIndex < MacroExpandedTokens.size());
1048 // Pop the cached macro expanded tokens from the end.
1049 MacroExpandedTokens.resize(tokIndex);
1050 MacroExpandingLexersStack.pop_back();
1053 /// ComputeDATE_TIME - Compute the current time, enter it into the specified
1054 /// scratch buffer, then return DATELoc/TIMELoc locations with the position of
1055 /// the identifier tokens inserted.
1056 static void ComputeDATE_TIME(SourceLocation &DATELoc, SourceLocation &TIMELoc,
1058 time_t TT = time(nullptr);
1059 struct tm *TM = localtime(&TT);
1061 static const char * const Months[] = {
1062 "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
1066 SmallString<32> TmpBuffer;
1067 llvm::raw_svector_ostream TmpStream(TmpBuffer);
1068 TmpStream << llvm::format("\"%s %2d %4d\"", Months[TM->tm_mon],
1069 TM->tm_mday, TM->tm_year + 1900);
1071 TmpTok.startToken();
1072 PP.CreateString(TmpStream.str(), TmpTok);
1073 DATELoc = TmpTok.getLocation();
1077 SmallString<32> TmpBuffer;
1078 llvm::raw_svector_ostream TmpStream(TmpBuffer);
1079 TmpStream << llvm::format("\"%02d:%02d:%02d\"",
1080 TM->tm_hour, TM->tm_min, TM->tm_sec);
1082 TmpTok.startToken();
1083 PP.CreateString(TmpStream.str(), TmpTok);
1084 TIMELoc = TmpTok.getLocation();
1088 /// HasFeature - Return true if we recognize and implement the feature
1089 /// specified by the identifier as a standard language feature.
1090 static bool HasFeature(const Preprocessor &PP, StringRef Feature) {
1091 const LangOptions &LangOpts = PP.getLangOpts();
1093 // Normalize the feature name, __foo__ becomes foo.
1094 if (Feature.startswith("__") && Feature.endswith("__") && Feature.size() >= 4)
1095 Feature = Feature.substr(2, Feature.size() - 4);
1097 return llvm::StringSwitch<bool>(Feature)
1098 .Case("address_sanitizer",
1099 LangOpts.Sanitize.hasOneOf(SanitizerKind::Address |
1100 SanitizerKind::KernelAddress))
1101 .Case("assume_nonnull", true)
1102 .Case("attribute_analyzer_noreturn", true)
1103 .Case("attribute_availability", true)
1104 .Case("attribute_availability_with_message", true)
1105 .Case("attribute_availability_app_extension", true)
1106 .Case("attribute_availability_with_version_underscores", true)
1107 .Case("attribute_availability_tvos", true)
1108 .Case("attribute_availability_watchos", true)
1109 .Case("attribute_availability_with_strict", true)
1110 .Case("attribute_availability_with_replacement", true)
1111 .Case("attribute_availability_in_templates", true)
1112 .Case("attribute_cf_returns_not_retained", true)
1113 .Case("attribute_cf_returns_retained", true)
1114 .Case("attribute_cf_returns_on_parameters", true)
1115 .Case("attribute_deprecated_with_message", true)
1116 .Case("attribute_deprecated_with_replacement", true)
1117 .Case("attribute_ext_vector_type", true)
1118 .Case("attribute_ns_returns_not_retained", true)
1119 .Case("attribute_ns_returns_retained", true)
1120 .Case("attribute_ns_consumes_self", true)
1121 .Case("attribute_ns_consumed", true)
1122 .Case("attribute_cf_consumed", true)
1123 .Case("attribute_objc_ivar_unused", true)
1124 .Case("attribute_objc_method_family", true)
1125 .Case("attribute_overloadable", true)
1126 .Case("attribute_unavailable_with_message", true)
1127 .Case("attribute_unused_on_fields", true)
1128 .Case("attribute_diagnose_if_objc", true)
1129 .Case("blocks", LangOpts.Blocks)
1130 .Case("c_thread_safety_attributes", true)
1131 .Case("cxx_exceptions", LangOpts.CXXExceptions)
1132 .Case("cxx_rtti", LangOpts.RTTI && LangOpts.RTTIData)
1133 .Case("enumerator_attributes", true)
1134 .Case("nullability", true)
1135 .Case("nullability_on_arrays", true)
1136 .Case("memory_sanitizer", LangOpts.Sanitize.has(SanitizerKind::Memory))
1137 .Case("thread_sanitizer", LangOpts.Sanitize.has(SanitizerKind::Thread))
1138 .Case("dataflow_sanitizer", LangOpts.Sanitize.has(SanitizerKind::DataFlow))
1139 .Case("efficiency_sanitizer",
1140 LangOpts.Sanitize.hasOneOf(SanitizerKind::Efficiency))
1141 // Objective-C features
1142 .Case("objc_arr", LangOpts.ObjCAutoRefCount) // FIXME: REMOVE?
1143 .Case("objc_arc", LangOpts.ObjCAutoRefCount)
1144 .Case("objc_arc_weak", LangOpts.ObjCWeak)
1145 .Case("objc_default_synthesize_properties", LangOpts.ObjC2)
1146 .Case("objc_fixed_enum", LangOpts.ObjC2)
1147 .Case("objc_instancetype", LangOpts.ObjC2)
1148 .Case("objc_kindof", LangOpts.ObjC2)
1149 .Case("objc_modules", LangOpts.ObjC2 && LangOpts.Modules)
1150 .Case("objc_nonfragile_abi", LangOpts.ObjCRuntime.isNonFragile())
1151 .Case("objc_property_explicit_atomic",
1152 true) // Does clang support explicit "atomic" keyword?
1153 .Case("objc_protocol_qualifier_mangling", true)
1154 .Case("objc_weak_class", LangOpts.ObjCRuntime.hasWeakClassImport())
1155 .Case("ownership_holds", true)
1156 .Case("ownership_returns", true)
1157 .Case("ownership_takes", true)
1158 .Case("objc_bool", true)
1159 .Case("objc_subscripting", LangOpts.ObjCRuntime.isNonFragile())
1160 .Case("objc_array_literals", LangOpts.ObjC2)
1161 .Case("objc_dictionary_literals", LangOpts.ObjC2)
1162 .Case("objc_boxed_expressions", LangOpts.ObjC2)
1163 .Case("objc_boxed_nsvalue_expressions", LangOpts.ObjC2)
1164 .Case("arc_cf_code_audited", true)
1165 .Case("objc_bridge_id", true)
1166 .Case("objc_bridge_id_on_typedefs", true)
1167 .Case("objc_generics", LangOpts.ObjC2)
1168 .Case("objc_generics_variance", LangOpts.ObjC2)
1169 .Case("objc_class_property", LangOpts.ObjC2)
1171 .Case("c_alignas", LangOpts.C11)
1172 .Case("c_alignof", LangOpts.C11)
1173 .Case("c_atomic", LangOpts.C11)
1174 .Case("c_generic_selections", LangOpts.C11)
1175 .Case("c_static_assert", LangOpts.C11)
1176 .Case("c_thread_local",
1177 LangOpts.C11 && PP.getTargetInfo().isTLSSupported())
1179 .Case("cxx_access_control_sfinae", LangOpts.CPlusPlus11)
1180 .Case("cxx_alias_templates", LangOpts.CPlusPlus11)
1181 .Case("cxx_alignas", LangOpts.CPlusPlus11)
1182 .Case("cxx_alignof", LangOpts.CPlusPlus11)
1183 .Case("cxx_atomic", LangOpts.CPlusPlus11)
1184 .Case("cxx_attributes", LangOpts.CPlusPlus11)
1185 .Case("cxx_auto_type", LangOpts.CPlusPlus11)
1186 .Case("cxx_constexpr", LangOpts.CPlusPlus11)
1187 .Case("cxx_constexpr_string_builtins", LangOpts.CPlusPlus11)
1188 .Case("cxx_decltype", LangOpts.CPlusPlus11)
1189 .Case("cxx_decltype_incomplete_return_types", LangOpts.CPlusPlus11)
1190 .Case("cxx_default_function_template_args", LangOpts.CPlusPlus11)
1191 .Case("cxx_defaulted_functions", LangOpts.CPlusPlus11)
1192 .Case("cxx_delegating_constructors", LangOpts.CPlusPlus11)
1193 .Case("cxx_deleted_functions", LangOpts.CPlusPlus11)
1194 .Case("cxx_explicit_conversions", LangOpts.CPlusPlus11)
1195 .Case("cxx_generalized_initializers", LangOpts.CPlusPlus11)
1196 .Case("cxx_implicit_moves", LangOpts.CPlusPlus11)
1197 .Case("cxx_inheriting_constructors", LangOpts.CPlusPlus11)
1198 .Case("cxx_inline_namespaces", LangOpts.CPlusPlus11)
1199 .Case("cxx_lambdas", LangOpts.CPlusPlus11)
1200 .Case("cxx_local_type_template_args", LangOpts.CPlusPlus11)
1201 .Case("cxx_nonstatic_member_init", LangOpts.CPlusPlus11)
1202 .Case("cxx_noexcept", LangOpts.CPlusPlus11)
1203 .Case("cxx_nullptr", LangOpts.CPlusPlus11)
1204 .Case("cxx_override_control", LangOpts.CPlusPlus11)
1205 .Case("cxx_range_for", LangOpts.CPlusPlus11)
1206 .Case("cxx_raw_string_literals", LangOpts.CPlusPlus11)
1207 .Case("cxx_reference_qualified_functions", LangOpts.CPlusPlus11)
1208 .Case("cxx_rvalue_references", LangOpts.CPlusPlus11)
1209 .Case("cxx_strong_enums", LangOpts.CPlusPlus11)
1210 .Case("cxx_static_assert", LangOpts.CPlusPlus11)
1211 .Case("cxx_thread_local",
1212 LangOpts.CPlusPlus11 && PP.getTargetInfo().isTLSSupported())
1213 .Case("cxx_trailing_return", LangOpts.CPlusPlus11)
1214 .Case("cxx_unicode_literals", LangOpts.CPlusPlus11)
1215 .Case("cxx_unrestricted_unions", LangOpts.CPlusPlus11)
1216 .Case("cxx_user_literals", LangOpts.CPlusPlus11)
1217 .Case("cxx_variadic_templates", LangOpts.CPlusPlus11)
1219 .Case("cxx_aggregate_nsdmi", LangOpts.CPlusPlus14)
1220 .Case("cxx_binary_literals", LangOpts.CPlusPlus14)
1221 .Case("cxx_contextual_conversions", LangOpts.CPlusPlus14)
1222 .Case("cxx_decltype_auto", LangOpts.CPlusPlus14)
1223 .Case("cxx_generic_lambdas", LangOpts.CPlusPlus14)
1224 .Case("cxx_init_captures", LangOpts.CPlusPlus14)
1225 .Case("cxx_relaxed_constexpr", LangOpts.CPlusPlus14)
1226 .Case("cxx_return_type_deduction", LangOpts.CPlusPlus14)
1227 .Case("cxx_variable_templates", LangOpts.CPlusPlus14)
1228 // NOTE: For features covered by SD-6, it is preferable to provide *only*
1229 // the SD-6 macro and not a __has_feature check.
1232 //.Case("cxx_runtime_arrays", LangOpts.CPlusPlusTSArrays)
1233 //.Case("cxx_concepts", LangOpts.CPlusPlusTSConcepts)
1234 // FIXME: Should this be __has_feature or __has_extension?
1235 //.Case("raw_invocation_type", LangOpts.CPlusPlus)
1237 // N.B. Additional type traits should not be added to the following list.
1238 // Instead, they should be detected by has_extension.
1239 .Case("has_nothrow_assign", LangOpts.CPlusPlus)
1240 .Case("has_nothrow_copy", LangOpts.CPlusPlus)
1241 .Case("has_nothrow_constructor", LangOpts.CPlusPlus)
1242 .Case("has_trivial_assign", LangOpts.CPlusPlus)
1243 .Case("has_trivial_copy", LangOpts.CPlusPlus)
1244 .Case("has_trivial_constructor", LangOpts.CPlusPlus)
1245 .Case("has_trivial_destructor", LangOpts.CPlusPlus)
1246 .Case("has_virtual_destructor", LangOpts.CPlusPlus)
1247 .Case("is_abstract", LangOpts.CPlusPlus)
1248 .Case("is_base_of", LangOpts.CPlusPlus)
1249 .Case("is_class", LangOpts.CPlusPlus)
1250 .Case("is_constructible", LangOpts.CPlusPlus)
1251 .Case("is_convertible_to", LangOpts.CPlusPlus)
1252 .Case("is_empty", LangOpts.CPlusPlus)
1253 .Case("is_enum", LangOpts.CPlusPlus)
1254 .Case("is_final", LangOpts.CPlusPlus)
1255 .Case("is_literal", LangOpts.CPlusPlus)
1256 .Case("is_standard_layout", LangOpts.CPlusPlus)
1257 .Case("is_pod", LangOpts.CPlusPlus)
1258 .Case("is_polymorphic", LangOpts.CPlusPlus)
1259 .Case("is_sealed", LangOpts.CPlusPlus && LangOpts.MicrosoftExt)
1260 .Case("is_trivial", LangOpts.CPlusPlus)
1261 .Case("is_trivially_assignable", LangOpts.CPlusPlus)
1262 .Case("is_trivially_constructible", LangOpts.CPlusPlus)
1263 .Case("is_trivially_copyable", LangOpts.CPlusPlus)
1264 .Case("is_union", LangOpts.CPlusPlus)
1265 .Case("modules", LangOpts.Modules)
1266 .Case("safe_stack", LangOpts.Sanitize.has(SanitizerKind::SafeStack))
1267 .Case("tls", PP.getTargetInfo().isTLSSupported())
1268 .Case("underlying_type", LangOpts.CPlusPlus)
1272 /// HasExtension - Return true if we recognize and implement the feature
1273 /// specified by the identifier, either as an extension or a standard language
1275 static bool HasExtension(const Preprocessor &PP, StringRef Extension) {
1276 if (HasFeature(PP, Extension))
1279 // If the use of an extension results in an error diagnostic, extensions are
1280 // effectively unavailable, so just return false here.
1281 if (PP.getDiagnostics().getExtensionHandlingBehavior() >=
1282 diag::Severity::Error)
1285 const LangOptions &LangOpts = PP.getLangOpts();
1287 // Normalize the extension name, __foo__ becomes foo.
1288 if (Extension.startswith("__") && Extension.endswith("__") &&
1289 Extension.size() >= 4)
1290 Extension = Extension.substr(2, Extension.size() - 4);
1292 // Because we inherit the feature list from HasFeature, this string switch
1293 // must be less restrictive than HasFeature's.
1294 return llvm::StringSwitch<bool>(Extension)
1295 // C11 features supported by other languages as extensions.
1296 .Case("c_alignas", true)
1297 .Case("c_alignof", true)
1298 .Case("c_atomic", true)
1299 .Case("c_generic_selections", true)
1300 .Case("c_static_assert", true)
1301 .Case("c_thread_local", PP.getTargetInfo().isTLSSupported())
1302 // C++11 features supported by other languages as extensions.
1303 .Case("cxx_atomic", LangOpts.CPlusPlus)
1304 .Case("cxx_deleted_functions", LangOpts.CPlusPlus)
1305 .Case("cxx_explicit_conversions", LangOpts.CPlusPlus)
1306 .Case("cxx_inline_namespaces", LangOpts.CPlusPlus)
1307 .Case("cxx_local_type_template_args", LangOpts.CPlusPlus)
1308 .Case("cxx_nonstatic_member_init", LangOpts.CPlusPlus)
1309 .Case("cxx_override_control", LangOpts.CPlusPlus)
1310 .Case("cxx_range_for", LangOpts.CPlusPlus)
1311 .Case("cxx_reference_qualified_functions", LangOpts.CPlusPlus)
1312 .Case("cxx_rvalue_references", LangOpts.CPlusPlus)
1313 .Case("cxx_variadic_templates", LangOpts.CPlusPlus)
1314 // C++14 features supported by other languages as extensions.
1315 .Case("cxx_binary_literals", true)
1316 .Case("cxx_init_captures", LangOpts.CPlusPlus11)
1317 .Case("cxx_variable_templates", LangOpts.CPlusPlus)
1318 // Miscellaneous language extensions
1319 .Case("overloadable_unmarked", true)
1323 /// EvaluateHasIncludeCommon - Process a '__has_include("path")'
1324 /// or '__has_include_next("path")' expression.
1325 /// Returns true if successful.
1326 static bool EvaluateHasIncludeCommon(Token &Tok,
1327 IdentifierInfo *II, Preprocessor &PP,
1328 const DirectoryLookup *LookupFrom,
1329 const FileEntry *LookupFromFile) {
1330 // Save the location of the current token. If a '(' is later found, use
1331 // that location. If not, use the end of this location instead.
1332 SourceLocation LParenLoc = Tok.getLocation();
1334 // These expressions are only allowed within a preprocessor directive.
1335 if (!PP.isParsingIfOrElifDirective()) {
1336 PP.Diag(LParenLoc, diag::err_pp_directive_required) << II->getName();
1337 // Return a valid identifier token.
1338 assert(Tok.is(tok::identifier));
1339 Tok.setIdentifierInfo(II);
1344 PP.LexNonComment(Tok);
1346 // Ensure we have a '('.
1347 if (Tok.isNot(tok::l_paren)) {
1348 // No '(', use end of last token.
1349 LParenLoc = PP.getLocForEndOfToken(LParenLoc);
1350 PP.Diag(LParenLoc, diag::err_pp_expected_after) << II << tok::l_paren;
1351 // If the next token looks like a filename or the start of one,
1352 // assume it is and process it as such.
1353 if (!Tok.is(tok::angle_string_literal) && !Tok.is(tok::string_literal) &&
1357 // Save '(' location for possible missing ')' message.
1358 LParenLoc = Tok.getLocation();
1360 if (PP.getCurrentLexer()) {
1361 // Get the file name.
1362 PP.getCurrentLexer()->LexIncludeFilename(Tok);
1364 // We're in a macro, so we can't use LexIncludeFilename; just
1365 // grab the next token.
1370 // Reserve a buffer to get the spelling.
1371 SmallString<128> FilenameBuffer;
1373 SourceLocation EndLoc;
1375 switch (Tok.getKind()) {
1377 // If the token kind is EOD, the error has already been diagnosed.
1380 case tok::angle_string_literal:
1381 case tok::string_literal: {
1382 bool Invalid = false;
1383 Filename = PP.getSpelling(Tok, FilenameBuffer, &Invalid);
1390 // This could be a <foo/bar.h> file coming from a macro expansion. In this
1391 // case, glue the tokens together into FilenameBuffer and interpret those.
1392 FilenameBuffer.push_back('<');
1393 if (PP.ConcatenateIncludeName(FilenameBuffer, EndLoc)) {
1394 // Let the caller know a <eod> was found by changing the Token kind.
1395 Tok.setKind(tok::eod);
1396 return false; // Found <eod> but no ">"? Diagnostic already emitted.
1398 Filename = FilenameBuffer;
1401 PP.Diag(Tok.getLocation(), diag::err_pp_expects_filename);
1405 SourceLocation FilenameLoc = Tok.getLocation();
1408 PP.LexNonComment(Tok);
1410 // Ensure we have a trailing ).
1411 if (Tok.isNot(tok::r_paren)) {
1412 PP.Diag(PP.getLocForEndOfToken(FilenameLoc), diag::err_pp_expected_after)
1413 << II << tok::r_paren;
1414 PP.Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1418 bool isAngled = PP.GetIncludeFilenameSpelling(Tok.getLocation(), Filename);
1419 // If GetIncludeFilenameSpelling set the start ptr to null, there was an
1421 if (Filename.empty())
1424 // Search include directories.
1425 const DirectoryLookup *CurDir;
1426 const FileEntry *File =
1427 PP.LookupFile(FilenameLoc, Filename, isAngled, LookupFrom, LookupFromFile,
1428 CurDir, nullptr, nullptr, nullptr, nullptr);
1430 // Get the result value. A result of true means the file exists.
1431 return File != nullptr;
1434 /// EvaluateHasInclude - Process a '__has_include("path")' expression.
1435 /// Returns true if successful.
1436 static bool EvaluateHasInclude(Token &Tok, IdentifierInfo *II,
1438 return EvaluateHasIncludeCommon(Tok, II, PP, nullptr, nullptr);
1441 /// EvaluateHasIncludeNext - Process '__has_include_next("path")' expression.
1442 /// Returns true if successful.
1443 static bool EvaluateHasIncludeNext(Token &Tok,
1444 IdentifierInfo *II, Preprocessor &PP) {
1445 // __has_include_next is like __has_include, except that we start
1446 // searching after the current found directory. If we can't do this,
1447 // issue a diagnostic.
1448 // FIXME: Factor out duplication with
1449 // Preprocessor::HandleIncludeNextDirective.
1450 const DirectoryLookup *Lookup = PP.GetCurDirLookup();
1451 const FileEntry *LookupFromFile = nullptr;
1452 if (PP.isInPrimaryFile() && PP.getLangOpts().IsHeaderFile) {
1453 // If the main file is a header, then it's either for PCH/AST generation,
1454 // or libclang opened it. Either way, handle it as a normal include below
1455 // and do not complain about __has_include_next.
1456 } else if (PP.isInPrimaryFile()) {
1458 PP.Diag(Tok, diag::pp_include_next_in_primary);
1459 } else if (PP.getCurrentLexerSubmodule()) {
1460 // Start looking up in the directory *after* the one in which the current
1461 // file would be found, if any.
1462 assert(PP.getCurrentLexer() && "#include_next directive in macro?");
1463 LookupFromFile = PP.getCurrentLexer()->getFileEntry();
1465 } else if (!Lookup) {
1466 PP.Diag(Tok, diag::pp_include_next_absolute_path);
1468 // Start looking up in the next directory.
1472 return EvaluateHasIncludeCommon(Tok, II, PP, Lookup, LookupFromFile);
1475 /// \brief Process single-argument builtin feature-like macros that return
1477 static void EvaluateFeatureLikeBuiltinMacro(llvm::raw_svector_ostream& OS,
1478 Token &Tok, IdentifierInfo *II,
1482 bool &HasLexedNextTok)> Op) {
1483 // Parse the initial '('.
1484 PP.LexUnexpandedToken(Tok);
1485 if (Tok.isNot(tok::l_paren)) {
1486 PP.Diag(Tok.getLocation(), diag::err_pp_expected_after) << II
1489 // Provide a dummy '0' value on output stream to elide further errors.
1490 if (!Tok.isOneOf(tok::eof, tok::eod)) {
1492 Tok.setKind(tok::numeric_constant);
1497 unsigned ParenDepth = 1;
1498 SourceLocation LParenLoc = Tok.getLocation();
1499 llvm::Optional<int> Result;
1502 bool SuppressDiagnostic = false;
1504 // Parse next token.
1505 PP.LexUnexpandedToken(Tok);
1508 switch (Tok.getKind()) {
1511 // Don't provide even a dummy value if the eod or eof marker is
1512 // reached. Simply provide a diagnostic.
1513 PP.Diag(Tok.getLocation(), diag::err_unterm_macro_invoc);
1517 if (!SuppressDiagnostic) {
1518 PP.Diag(Tok.getLocation(), diag::err_too_many_args_in_macro_invoc);
1519 SuppressDiagnostic = true;
1525 if (Result.hasValue())
1527 if (!SuppressDiagnostic) {
1528 PP.Diag(Tok.getLocation(), diag::err_pp_nested_paren) << II;
1529 SuppressDiagnostic = true;
1534 if (--ParenDepth > 0)
1537 // The last ')' has been reached; return the value if one found or
1538 // a diagnostic and a dummy value.
1539 if (Result.hasValue())
1540 OS << Result.getValue();
1543 if (!SuppressDiagnostic)
1544 PP.Diag(Tok.getLocation(), diag::err_too_few_args_in_macro_invoc);
1546 Tok.setKind(tok::numeric_constant);
1550 // Parse the macro argument, if one not found so far.
1551 if (Result.hasValue())
1554 bool HasLexedNextToken = false;
1555 Result = Op(Tok, HasLexedNextToken);
1557 if (HasLexedNextToken)
1563 // Diagnose missing ')'.
1564 if (!SuppressDiagnostic) {
1565 if (auto Diag = PP.Diag(Tok.getLocation(), diag::err_pp_expected_after)) {
1566 if (IdentifierInfo *LastII = ResultTok.getIdentifierInfo())
1569 Diag << ResultTok.getKind();
1570 Diag << tok::r_paren << ResultTok.getLocation();
1572 PP.Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1573 SuppressDiagnostic = true;
1578 /// \brief Helper function to return the IdentifierInfo structure of a Token
1579 /// or generate a diagnostic if none available.
1580 static IdentifierInfo *ExpectFeatureIdentifierInfo(Token &Tok,
1584 if (!Tok.isAnnotation() && (II = Tok.getIdentifierInfo()))
1587 PP.Diag(Tok.getLocation(), DiagID);
1591 /// ExpandBuiltinMacro - If an identifier token is read that is to be expanded
1592 /// as a builtin macro, handle it and return the next token as 'Tok'.
1593 void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
1594 // Figure out which token this is.
1595 IdentifierInfo *II = Tok.getIdentifierInfo();
1596 assert(II && "Can't be a macro without id info!");
1598 // If this is an _Pragma or Microsoft __pragma directive, expand it,
1599 // invoke the pragma handler, then lex the token after it.
1600 if (II == Ident_Pragma)
1601 return Handle_Pragma(Tok);
1602 else if (II == Ident__pragma) // in non-MS mode this is null
1603 return HandleMicrosoft__pragma(Tok);
1605 ++NumBuiltinMacroExpanded;
1607 SmallString<128> TmpBuffer;
1608 llvm::raw_svector_ostream OS(TmpBuffer);
1610 // Set up the return result.
1611 Tok.setIdentifierInfo(nullptr);
1612 Tok.clearFlag(Token::NeedsCleaning);
1614 if (II == Ident__LINE__) {
1615 // C99 6.10.8: "__LINE__: The presumed line number (within the current
1616 // source file) of the current source line (an integer constant)". This can
1617 // be affected by #line.
1618 SourceLocation Loc = Tok.getLocation();
1620 // Advance to the location of the first _, this might not be the first byte
1621 // of the token if it starts with an escaped newline.
1622 Loc = AdvanceToTokenCharacter(Loc, 0);
1624 // One wrinkle here is that GCC expands __LINE__ to location of the *end* of
1625 // a macro expansion. This doesn't matter for object-like macros, but
1626 // can matter for a function-like macro that expands to contain __LINE__.
1627 // Skip down through expansion points until we find a file loc for the
1628 // end of the expansion history.
1629 Loc = SourceMgr.getExpansionRange(Loc).second;
1630 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Loc);
1632 // __LINE__ expands to a simple numeric value.
1633 OS << (PLoc.isValid()? PLoc.getLine() : 1);
1634 Tok.setKind(tok::numeric_constant);
1635 } else if (II == Ident__FILE__ || II == Ident__BASE_FILE__) {
1636 // C99 6.10.8: "__FILE__: The presumed name of the current source file (a
1637 // character string literal)". This can be affected by #line.
1638 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
1640 // __BASE_FILE__ is a GNU extension that returns the top of the presumed
1641 // #include stack instead of the current file.
1642 if (II == Ident__BASE_FILE__ && PLoc.isValid()) {
1643 SourceLocation NextLoc = PLoc.getIncludeLoc();
1644 while (NextLoc.isValid()) {
1645 PLoc = SourceMgr.getPresumedLoc(NextLoc);
1646 if (PLoc.isInvalid())
1649 NextLoc = PLoc.getIncludeLoc();
1653 // Escape this filename. Turn '\' -> '\\' '"' -> '\"'
1654 SmallString<128> FN;
1655 if (PLoc.isValid()) {
1656 FN += PLoc.getFilename();
1657 Lexer::Stringify(FN);
1658 OS << '"' << FN << '"';
1660 Tok.setKind(tok::string_literal);
1661 } else if (II == Ident__DATE__) {
1662 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1663 if (!DATELoc.isValid())
1664 ComputeDATE_TIME(DATELoc, TIMELoc, *this);
1665 Tok.setKind(tok::string_literal);
1666 Tok.setLength(strlen("\"Mmm dd yyyy\""));
1667 Tok.setLocation(SourceMgr.createExpansionLoc(DATELoc, Tok.getLocation(),
1671 } else if (II == Ident__TIME__) {
1672 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1673 if (!TIMELoc.isValid())
1674 ComputeDATE_TIME(DATELoc, TIMELoc, *this);
1675 Tok.setKind(tok::string_literal);
1676 Tok.setLength(strlen("\"hh:mm:ss\""));
1677 Tok.setLocation(SourceMgr.createExpansionLoc(TIMELoc, Tok.getLocation(),
1681 } else if (II == Ident__INCLUDE_LEVEL__) {
1682 // Compute the presumed include depth of this token. This can be affected
1683 // by GNU line markers.
1686 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
1687 if (PLoc.isValid()) {
1688 PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
1689 for (; PLoc.isValid(); ++Depth)
1690 PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
1693 // __INCLUDE_LEVEL__ expands to a simple numeric value.
1695 Tok.setKind(tok::numeric_constant);
1696 } else if (II == Ident__TIMESTAMP__) {
1697 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1698 // MSVC, ICC, GCC, VisualAge C++ extension. The generated string should be
1699 // of the form "Ddd Mmm dd hh::mm::ss yyyy", which is returned by asctime.
1701 // Get the file that we are lexing out of. If we're currently lexing from
1702 // a macro, dig into the include stack.
1703 const FileEntry *CurFile = nullptr;
1704 PreprocessorLexer *TheLexer = getCurrentFileLexer();
1707 CurFile = SourceMgr.getFileEntryForID(TheLexer->getFileID());
1711 time_t TT = CurFile->getModificationTime();
1712 struct tm *TM = localtime(&TT);
1713 Result = asctime(TM);
1715 Result = "??? ??? ?? ??:??:?? ????\n";
1717 // Surround the string with " and strip the trailing newline.
1718 OS << '"' << StringRef(Result).drop_back() << '"';
1719 Tok.setKind(tok::string_literal);
1720 } else if (II == Ident__COUNTER__) {
1721 // __COUNTER__ expands to a simple numeric value.
1722 OS << CounterValue++;
1723 Tok.setKind(tok::numeric_constant);
1724 } else if (II == Ident__has_feature) {
1725 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1726 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1727 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1728 diag::err_feature_check_malformed);
1729 return II && HasFeature(*this, II->getName());
1731 } else if (II == Ident__has_extension) {
1732 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1733 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1734 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1735 diag::err_feature_check_malformed);
1736 return II && HasExtension(*this, II->getName());
1738 } else if (II == Ident__has_builtin) {
1739 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1740 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1741 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1742 diag::err_feature_check_malformed);
1745 else if (II->getBuiltinID() != 0)
1748 const LangOptions &LangOpts = getLangOpts();
1749 return llvm::StringSwitch<bool>(II->getName())
1750 .Case("__make_integer_seq", LangOpts.CPlusPlus)
1751 .Case("__type_pack_element", LangOpts.CPlusPlus)
1752 .Case("__builtin_available", true)
1756 } else if (II == Ident__is_identifier) {
1757 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1758 [](Token &Tok, bool &HasLexedNextToken) -> int {
1759 return Tok.is(tok::identifier);
1761 } else if (II == Ident__has_attribute) {
1762 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1763 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1764 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1765 diag::err_feature_check_malformed);
1766 return II ? hasAttribute(AttrSyntax::GNU, nullptr, II,
1767 getTargetInfo(), getLangOpts()) : 0;
1769 } else if (II == Ident__has_declspec) {
1770 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1771 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1772 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1773 diag::err_feature_check_malformed);
1774 return II ? hasAttribute(AttrSyntax::Declspec, nullptr, II,
1775 getTargetInfo(), getLangOpts()) : 0;
1777 } else if (II == Ident__has_cpp_attribute) {
1778 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1779 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1780 IdentifierInfo *ScopeII = nullptr;
1781 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1782 diag::err_feature_check_malformed);
1786 // It is possible to receive a scope token. Read the "::", if it is
1787 // available, and the subsequent identifier.
1788 LexUnexpandedToken(Tok);
1789 if (Tok.isNot(tok::coloncolon))
1790 HasLexedNextToken = true;
1793 LexUnexpandedToken(Tok);
1794 II = ExpectFeatureIdentifierInfo(Tok, *this,
1795 diag::err_feature_check_malformed);
1798 return II ? hasAttribute(AttrSyntax::CXX, ScopeII, II,
1799 getTargetInfo(), getLangOpts()) : 0;
1801 } else if (II == Ident__has_include ||
1802 II == Ident__has_include_next) {
1803 // The argument to these two builtins should be a parenthesized
1804 // file name string literal using angle brackets (<>) or
1805 // double-quotes ("").
1807 if (II == Ident__has_include)
1808 Value = EvaluateHasInclude(Tok, II, *this);
1810 Value = EvaluateHasIncludeNext(Tok, II, *this);
1812 if (Tok.isNot(tok::r_paren))
1815 Tok.setKind(tok::numeric_constant);
1816 } else if (II == Ident__has_warning) {
1817 // The argument should be a parenthesized string literal.
1818 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1819 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1820 std::string WarningName;
1821 SourceLocation StrStartLoc = Tok.getLocation();
1823 HasLexedNextToken = Tok.is(tok::string_literal);
1824 if (!FinishLexStringLiteral(Tok, WarningName, "'__has_warning'",
1825 /*MacroExpansion=*/false))
1828 // FIXME: Should we accept "-R..." flags here, or should that be
1829 // handled by a separate __has_remark?
1830 if (WarningName.size() < 3 || WarningName[0] != '-' ||
1831 WarningName[1] != 'W') {
1832 Diag(StrStartLoc, diag::warn_has_warning_invalid_option);
1836 // Finally, check if the warning flags maps to a diagnostic group.
1837 // We construct a SmallVector here to talk to getDiagnosticIDs().
1838 // Although we don't use the result, this isn't a hot path, and not
1839 // worth special casing.
1840 SmallVector<diag::kind, 10> Diags;
1841 return !getDiagnostics().getDiagnosticIDs()->
1842 getDiagnosticsInGroup(diag::Flavor::WarningOrError,
1843 WarningName.substr(2), Diags);
1845 } else if (II == Ident__building_module) {
1846 // The argument to this builtin should be an identifier. The
1847 // builtin evaluates to 1 when that identifier names the module we are
1848 // currently building.
1849 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1850 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1851 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1852 diag::err_expected_id_building_module);
1853 return getLangOpts().isCompilingModule() && II &&
1854 (II->getName() == getLangOpts().CurrentModule);
1856 } else if (II == Ident__MODULE__) {
1857 // The current module as an identifier.
1858 OS << getLangOpts().CurrentModule;
1859 IdentifierInfo *ModuleII = getIdentifierInfo(getLangOpts().CurrentModule);
1860 Tok.setIdentifierInfo(ModuleII);
1861 Tok.setKind(ModuleII->getTokenID());
1862 } else if (II == Ident__identifier) {
1863 SourceLocation Loc = Tok.getLocation();
1865 // We're expecting '__identifier' '(' identifier ')'. Try to recover
1866 // if the parens are missing.
1868 if (Tok.isNot(tok::l_paren)) {
1869 // No '(', use end of last token.
1870 Diag(getLocForEndOfToken(Loc), diag::err_pp_expected_after)
1871 << II << tok::l_paren;
1872 // If the next token isn't valid as our argument, we can't recover.
1873 if (!Tok.isAnnotation() && Tok.getIdentifierInfo())
1874 Tok.setKind(tok::identifier);
1878 SourceLocation LParenLoc = Tok.getLocation();
1881 if (!Tok.isAnnotation() && Tok.getIdentifierInfo())
1882 Tok.setKind(tok::identifier);
1884 Diag(Tok.getLocation(), diag::err_pp_identifier_arg_not_identifier)
1886 // Don't walk past anything that's not a real token.
1887 if (Tok.isOneOf(tok::eof, tok::eod) || Tok.isAnnotation())
1891 // Discard the ')', preserving 'Tok' as our result.
1893 LexNonComment(RParen);
1894 if (RParen.isNot(tok::r_paren)) {
1895 Diag(getLocForEndOfToken(Tok.getLocation()), diag::err_pp_expected_after)
1896 << Tok.getKind() << tok::r_paren;
1897 Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1901 llvm_unreachable("Unknown identifier!");
1903 CreateString(OS.str(), Tok, Tok.getLocation(), Tok.getLocation());
1906 void Preprocessor::markMacroAsUsed(MacroInfo *MI) {
1907 // If the 'used' status changed, and the macro requires 'unused' warning,
1908 // remove its SourceLocation from the warn-for-unused-macro locations.
1909 if (MI->isWarnIfUnused() && !MI->isUsed())
1910 WarnUnusedMacroLocs.erase(MI->getDefinitionLoc());
1911 MI->setIsUsed(true);