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_c_attribute = RegisterBuiltinMacro(*this, "__has_c_attribute");
373 Ident__has_declspec = RegisterBuiltinMacro(*this, "__has_declspec_attribute");
374 Ident__has_include = RegisterBuiltinMacro(*this, "__has_include");
375 Ident__has_include_next = RegisterBuiltinMacro(*this, "__has_include_next");
376 Ident__has_warning = RegisterBuiltinMacro(*this, "__has_warning");
377 Ident__is_identifier = RegisterBuiltinMacro(*this, "__is_identifier");
378 Ident__is_target_arch = RegisterBuiltinMacro(*this, "__is_target_arch");
379 Ident__is_target_vendor = RegisterBuiltinMacro(*this, "__is_target_vendor");
380 Ident__is_target_os = RegisterBuiltinMacro(*this, "__is_target_os");
381 Ident__is_target_environment =
382 RegisterBuiltinMacro(*this, "__is_target_environment");
385 Ident__building_module = RegisterBuiltinMacro(*this, "__building_module");
386 if (!LangOpts.CurrentModule.empty())
387 Ident__MODULE__ = RegisterBuiltinMacro(*this, "__MODULE__");
389 Ident__MODULE__ = nullptr;
392 /// isTrivialSingleTokenExpansion - Return true if MI, which has a single token
393 /// in its expansion, currently expands to that token literally.
394 static bool isTrivialSingleTokenExpansion(const MacroInfo *MI,
395 const IdentifierInfo *MacroIdent,
397 IdentifierInfo *II = MI->getReplacementToken(0).getIdentifierInfo();
399 // If the token isn't an identifier, it's always literally expanded.
400 if (!II) return true;
402 // If the information about this identifier is out of date, update it from
403 // the external source.
404 if (II->isOutOfDate())
405 PP.getExternalSource()->updateOutOfDateIdentifier(*II);
407 // If the identifier is a macro, and if that macro is enabled, it may be
408 // expanded so it's not a trivial expansion.
409 if (auto *ExpansionMI = PP.getMacroInfo(II))
410 if (ExpansionMI->isEnabled() &&
411 // Fast expanding "#define X X" is ok, because X would be disabled.
415 // If this is an object-like macro invocation, it is safe to trivially expand
417 if (MI->isObjectLike()) return true;
419 // If this is a function-like macro invocation, it's safe to trivially expand
420 // as long as the identifier is not a macro argument.
421 return std::find(MI->param_begin(), MI->param_end(), II) == MI->param_end();
424 /// isNextPPTokenLParen - Determine whether the next preprocessor token to be
425 /// lexed is a '('. If so, consume the token and return true, if not, this
426 /// method should have no observable side-effect on the lexed tokens.
427 bool Preprocessor::isNextPPTokenLParen() {
428 // Do some quick tests for rejection cases.
431 Val = CurLexer->isNextPPTokenLParen();
432 else if (CurPTHLexer)
433 Val = CurPTHLexer->isNextPPTokenLParen();
435 Val = CurTokenLexer->isNextTokenLParen();
438 // We have run off the end. If it's a source file we don't
439 // examine enclosing ones (C99 5.1.1.2p4). Otherwise walk up the
443 for (const IncludeStackInfo &Entry : llvm::reverse(IncludeMacroStack)) {
445 Val = Entry.TheLexer->isNextPPTokenLParen();
446 else if (Entry.ThePTHLexer)
447 Val = Entry.ThePTHLexer->isNextPPTokenLParen();
449 Val = Entry.TheTokenLexer->isNextTokenLParen();
454 // Ran off the end of a source file?
455 if (Entry.ThePPLexer)
460 // Okay, if we know that the token is a '(', lex it and return. Otherwise we
461 // have found something that isn't a '(' or we found the end of the
462 // translation unit. In either case, return false.
466 /// HandleMacroExpandedIdentifier - If an identifier token is read that is to be
467 /// expanded as a macro, handle it and return the next token as 'Identifier'.
468 bool Preprocessor::HandleMacroExpandedIdentifier(Token &Identifier,
469 const MacroDefinition &M) {
470 MacroInfo *MI = M.getMacroInfo();
472 // If this is a macro expansion in the "#if !defined(x)" line for the file,
473 // then the macro could expand to different things in other contexts, we need
474 // to disable the optimization in this case.
475 if (CurPPLexer) CurPPLexer->MIOpt.ExpandedMacro();
477 // If this is a builtin macro, like __LINE__ or _Pragma, handle it specially.
478 if (MI->isBuiltinMacro()) {
480 Callbacks->MacroExpands(Identifier, M, Identifier.getLocation(),
482 ExpandBuiltinMacro(Identifier);
486 /// Args - If this is a function-like macro expansion, this contains,
487 /// for each macro argument, the list of tokens that were provided to the
489 MacroArgs *Args = nullptr;
491 // Remember where the end of the expansion occurred. For an object-like
492 // macro, this is the identifier. For a function-like macro, this is the ')'.
493 SourceLocation ExpansionEnd = Identifier.getLocation();
495 // If this is a function-like macro, read the arguments.
496 if (MI->isFunctionLike()) {
497 // Remember that we are now parsing the arguments to a macro invocation.
498 // Preprocessor directives used inside macro arguments are not portable, and
499 // this enables the warning.
501 Args = ReadMacroCallArgumentList(Identifier, MI, ExpansionEnd);
503 // Finished parsing args.
506 // If there was an error parsing the arguments, bail out.
507 if (!Args) return true;
509 ++NumFnMacroExpanded;
514 // Notice that this macro has been used.
517 // Remember where the token is expanded.
518 SourceLocation ExpandLoc = Identifier.getLocation();
519 SourceRange ExpansionRange(ExpandLoc, ExpansionEnd);
523 // We can have macro expansion inside a conditional directive while
524 // reading the function macro arguments. To ensure, in that case, that
525 // MacroExpands callbacks still happen in source order, queue this
526 // callback to have it happen after the function macro callback.
527 DelayedMacroExpandsCallbacks.push_back(
528 MacroExpandsInfo(Identifier, M, ExpansionRange));
530 Callbacks->MacroExpands(Identifier, M, ExpansionRange, Args);
531 if (!DelayedMacroExpandsCallbacks.empty()) {
532 for (const MacroExpandsInfo &Info : DelayedMacroExpandsCallbacks) {
533 // FIXME: We lose macro args info with delayed callback.
534 Callbacks->MacroExpands(Info.Tok, Info.MD, Info.Range,
537 DelayedMacroExpandsCallbacks.clear();
542 // If the macro definition is ambiguous, complain.
543 if (M.isAmbiguous()) {
544 Diag(Identifier, diag::warn_pp_ambiguous_macro)
545 << Identifier.getIdentifierInfo();
546 Diag(MI->getDefinitionLoc(), diag::note_pp_ambiguous_macro_chosen)
547 << Identifier.getIdentifierInfo();
548 M.forAllDefinitions([&](const MacroInfo *OtherMI) {
550 Diag(OtherMI->getDefinitionLoc(), diag::note_pp_ambiguous_macro_other)
551 << Identifier.getIdentifierInfo();
555 // If we started lexing a macro, enter the macro expansion body.
557 // If this macro expands to no tokens, don't bother to push it onto the
558 // expansion stack, only to take it right back off.
559 if (MI->getNumTokens() == 0) {
560 // No need for arg info.
561 if (Args) Args->destroy(*this);
563 // Propagate whitespace info as if we had pushed, then popped,
565 Identifier.setFlag(Token::LeadingEmptyMacro);
566 PropagateLineStartLeadingSpaceInfo(Identifier);
567 ++NumFastMacroExpanded;
569 } else if (MI->getNumTokens() == 1 &&
570 isTrivialSingleTokenExpansion(MI, Identifier.getIdentifierInfo(),
572 // Otherwise, if this macro expands into a single trivially-expanded
573 // token: expand it now. This handles common cases like
576 // No need for arg info.
577 if (Args) Args->destroy(*this);
579 // Propagate the isAtStartOfLine/hasLeadingSpace markers of the macro
580 // identifier to the expanded token.
581 bool isAtStartOfLine = Identifier.isAtStartOfLine();
582 bool hasLeadingSpace = Identifier.hasLeadingSpace();
584 // Replace the result token.
585 Identifier = MI->getReplacementToken(0);
587 // Restore the StartOfLine/LeadingSpace markers.
588 Identifier.setFlagValue(Token::StartOfLine , isAtStartOfLine);
589 Identifier.setFlagValue(Token::LeadingSpace, hasLeadingSpace);
591 // Update the tokens location to include both its expansion and physical
594 SourceMgr.createExpansionLoc(Identifier.getLocation(), ExpandLoc,
595 ExpansionEnd,Identifier.getLength());
596 Identifier.setLocation(Loc);
598 // If this is a disabled macro or #define X X, we must mark the result as
600 if (IdentifierInfo *NewII = Identifier.getIdentifierInfo()) {
601 if (MacroInfo *NewMI = getMacroInfo(NewII))
602 if (!NewMI->isEnabled() || NewMI == MI) {
603 Identifier.setFlag(Token::DisableExpand);
604 // Don't warn for "#define X X" like "#define bool bool" from
606 if (NewMI != MI || MI->isFunctionLike())
607 Diag(Identifier, diag::pp_disabled_macro_expansion);
611 // Since this is not an identifier token, it can't be macro expanded, so
613 ++NumFastMacroExpanded;
617 // Start expanding the macro.
618 EnterMacro(Identifier, ExpansionEnd, MI, Args);
627 /// CheckMatchedBrackets - Returns true if the braces and parentheses in the
628 /// token vector are properly nested.
629 static bool CheckMatchedBrackets(const SmallVectorImpl<Token> &Tokens) {
630 SmallVector<Bracket, 8> Brackets;
631 for (SmallVectorImpl<Token>::const_iterator I = Tokens.begin(),
634 if (I->is(tok::l_paren)) {
635 Brackets.push_back(Paren);
636 } else if (I->is(tok::r_paren)) {
637 if (Brackets.empty() || Brackets.back() == Brace)
640 } else if (I->is(tok::l_brace)) {
641 Brackets.push_back(Brace);
642 } else if (I->is(tok::r_brace)) {
643 if (Brackets.empty() || Brackets.back() == Paren)
648 return Brackets.empty();
651 /// GenerateNewArgTokens - Returns true if OldTokens can be converted to a new
652 /// vector of tokens in NewTokens. The new number of arguments will be placed
653 /// in NumArgs and the ranges which need to surrounded in parentheses will be
655 /// Returns false if the token stream cannot be changed. If this is because
656 /// of an initializer list starting a macro argument, the range of those
657 /// initializer lists will be place in InitLists.
658 static bool GenerateNewArgTokens(Preprocessor &PP,
659 SmallVectorImpl<Token> &OldTokens,
660 SmallVectorImpl<Token> &NewTokens,
662 SmallVectorImpl<SourceRange> &ParenHints,
663 SmallVectorImpl<SourceRange> &InitLists) {
664 if (!CheckMatchedBrackets(OldTokens))
667 // Once it is known that the brackets are matched, only a simple count of the
671 // First token of a new macro argument.
672 SmallVectorImpl<Token>::iterator ArgStartIterator = OldTokens.begin();
674 // First closing brace in a new macro argument. Used to generate
675 // SourceRanges for InitLists.
676 SmallVectorImpl<Token>::iterator ClosingBrace = OldTokens.end();
679 // Set to true when a macro separator token is found inside a braced list.
680 // If true, the fixed argument spans multiple old arguments and ParenHints
682 bool FoundSeparatorToken = false;
683 for (SmallVectorImpl<Token>::iterator I = OldTokens.begin(),
686 if (I->is(tok::l_brace)) {
688 } else if (I->is(tok::r_brace)) {
690 if (Braces == 0 && ClosingBrace == E && FoundSeparatorToken)
692 } else if (I->is(tok::eof)) {
693 // EOF token is used to separate macro arguments
695 // Assume comma separator is actually braced list separator and change
696 // it back to a comma.
697 FoundSeparatorToken = true;
698 I->setKind(tok::comma);
700 } else { // Braces == 0
701 // Separator token still separates arguments.
704 // If the argument starts with a brace, it can't be fixed with
705 // parentheses. A different diagnostic will be given.
706 if (FoundSeparatorToken && ArgStartIterator->is(tok::l_brace)) {
708 SourceRange(ArgStartIterator->getLocation(),
709 PP.getLocForEndOfToken(ClosingBrace->getLocation())));
714 if (FoundSeparatorToken) {
715 TempToken.startToken();
716 TempToken.setKind(tok::l_paren);
717 TempToken.setLocation(ArgStartIterator->getLocation());
718 TempToken.setLength(0);
719 NewTokens.push_back(TempToken);
722 // Copy over argument tokens
723 NewTokens.insert(NewTokens.end(), ArgStartIterator, I);
725 // Add right paren and store the paren locations in ParenHints
726 if (FoundSeparatorToken) {
727 SourceLocation Loc = PP.getLocForEndOfToken((I - 1)->getLocation());
728 TempToken.startToken();
729 TempToken.setKind(tok::r_paren);
730 TempToken.setLocation(Loc);
731 TempToken.setLength(0);
732 NewTokens.push_back(TempToken);
733 ParenHints.push_back(SourceRange(ArgStartIterator->getLocation(),
737 // Copy separator token
738 NewTokens.push_back(*I);
741 ArgStartIterator = I + 1;
742 FoundSeparatorToken = false;
747 return !ParenHints.empty() && InitLists.empty();
750 /// ReadFunctionLikeMacroArgs - After reading "MACRO" and knowing that the next
751 /// token is the '(' of the macro, this method is invoked to read all of the
752 /// actual arguments specified for the macro invocation. This returns null on
754 MacroArgs *Preprocessor::ReadMacroCallArgumentList(Token &MacroName,
756 SourceLocation &MacroEnd) {
757 // The number of fixed arguments to parse.
758 unsigned NumFixedArgsLeft = MI->getNumParams();
759 bool isVariadic = MI->isVariadic();
761 // Outer loop, while there are more arguments, keep reading them.
764 // Read arguments as unexpanded tokens. This avoids issues, e.g., where
765 // an argument value in a macro could expand to ',' or '(' or ')'.
766 LexUnexpandedToken(Tok);
767 assert(Tok.is(tok::l_paren) && "Error computing l-paren-ness?");
769 // ArgTokens - Build up a list of tokens that make up each argument. Each
770 // argument is separated by an EOF token. Use a SmallVector so we can avoid
771 // heap allocations in the common case.
772 SmallVector<Token, 64> ArgTokens;
773 bool ContainsCodeCompletionTok = false;
774 bool FoundElidedComma = false;
776 SourceLocation TooManyArgsLoc;
778 unsigned NumActuals = 0;
779 while (Tok.isNot(tok::r_paren)) {
780 if (ContainsCodeCompletionTok && Tok.isOneOf(tok::eof, tok::eod))
783 assert(Tok.isOneOf(tok::l_paren, tok::comma) &&
784 "only expect argument separators here");
786 size_t ArgTokenStart = ArgTokens.size();
787 SourceLocation ArgStartLoc = Tok.getLocation();
789 // C99 6.10.3p11: Keep track of the number of l_parens we have seen. Note
790 // that we already consumed the first one.
791 unsigned NumParens = 0;
794 // Read arguments as unexpanded tokens. This avoids issues, e.g., where
795 // an argument value in a macro could expand to ',' or '(' or ')'.
796 LexUnexpandedToken(Tok);
798 if (Tok.isOneOf(tok::eof, tok::eod)) { // "#if f(<eof>" & "#if f(\n"
799 if (!ContainsCodeCompletionTok) {
800 Diag(MacroName, diag::err_unterm_macro_invoc);
801 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
802 << MacroName.getIdentifierInfo();
803 // Do not lose the EOF/EOD. Return it to the client.
807 // Do not lose the EOF/EOD.
808 auto Toks = llvm::make_unique<Token[]>(1);
810 EnterTokenStream(std::move(Toks), 1, true);
812 } else if (Tok.is(tok::r_paren)) {
813 // If we found the ) token, the macro arg list is done.
814 if (NumParens-- == 0) {
815 MacroEnd = Tok.getLocation();
816 if (!ArgTokens.empty() &&
817 ArgTokens.back().commaAfterElided()) {
818 FoundElidedComma = true;
822 } else if (Tok.is(tok::l_paren)) {
824 } else if (Tok.is(tok::comma) && NumParens == 0 &&
825 !(Tok.getFlags() & Token::IgnoredComma)) {
826 // In Microsoft-compatibility mode, single commas from nested macro
827 // expansions should not be considered as argument separators. We test
828 // for this with the IgnoredComma token flag above.
830 // Comma ends this argument if there are more fixed arguments expected.
831 // However, if this is a variadic macro, and this is part of the
832 // variadic part, then the comma is just an argument token.
833 if (!isVariadic) break;
834 if (NumFixedArgsLeft > 1)
836 } else if (Tok.is(tok::comment) && !KeepMacroComments) {
837 // If this is a comment token in the argument list and we're just in
838 // -C mode (not -CC mode), discard the comment.
840 } else if (!Tok.isAnnotation() && Tok.getIdentifierInfo() != nullptr) {
841 // Reading macro arguments can cause macros that we are currently
842 // expanding from to be popped off the expansion stack. Doing so causes
843 // them to be reenabled for expansion. Here we record whether any
844 // identifiers we lex as macro arguments correspond to disabled macros.
845 // If so, we mark the token as noexpand. This is a subtle aspect of
847 if (MacroInfo *MI = getMacroInfo(Tok.getIdentifierInfo()))
848 if (!MI->isEnabled())
849 Tok.setFlag(Token::DisableExpand);
850 } else if (Tok.is(tok::code_completion)) {
851 ContainsCodeCompletionTok = true;
853 CodeComplete->CodeCompleteMacroArgument(MacroName.getIdentifierInfo(),
855 // Don't mark that we reached the code-completion point because the
856 // parser is going to handle the token and there will be another
857 // code-completion callback.
860 ArgTokens.push_back(Tok);
863 // If this was an empty argument list foo(), don't add this as an empty
865 if (ArgTokens.empty() && Tok.getKind() == tok::r_paren)
868 // If this is not a variadic macro, and too many args were specified, emit
870 if (!isVariadic && NumFixedArgsLeft == 0 && TooManyArgsLoc.isInvalid()) {
871 if (ArgTokens.size() != ArgTokenStart)
872 TooManyArgsLoc = ArgTokens[ArgTokenStart].getLocation();
874 TooManyArgsLoc = ArgStartLoc;
877 // Empty arguments are standard in C99 and C++0x, and are supported as an
878 // extension in other modes.
879 if (ArgTokens.size() == ArgTokenStart && !LangOpts.C99)
880 Diag(Tok, LangOpts.CPlusPlus11 ?
881 diag::warn_cxx98_compat_empty_fnmacro_arg :
882 diag::ext_empty_fnmacro_arg);
884 // Add a marker EOF token to the end of the token list for this argument.
887 EOFTok.setKind(tok::eof);
888 EOFTok.setLocation(Tok.getLocation());
890 ArgTokens.push_back(EOFTok);
892 if (!ContainsCodeCompletionTok && NumFixedArgsLeft != 0)
896 // Okay, we either found the r_paren. Check to see if we parsed too few
898 unsigned MinArgsExpected = MI->getNumParams();
900 // If this is not a variadic macro, and too many args were specified, emit
902 if (!isVariadic && NumActuals > MinArgsExpected &&
903 !ContainsCodeCompletionTok) {
904 // Emit the diagnostic at the macro name in case there is a missing ).
905 // Emitting it at the , could be far away from the macro name.
906 Diag(TooManyArgsLoc, diag::err_too_many_args_in_macro_invoc);
907 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
908 << MacroName.getIdentifierInfo();
910 // Commas from braced initializer lists will be treated as argument
911 // separators inside macros. Attempt to correct for this with parentheses.
912 // TODO: See if this can be generalized to angle brackets for templates
913 // inside macro arguments.
915 SmallVector<Token, 4> FixedArgTokens;
916 unsigned FixedNumArgs = 0;
917 SmallVector<SourceRange, 4> ParenHints, InitLists;
918 if (!GenerateNewArgTokens(*this, ArgTokens, FixedArgTokens, FixedNumArgs,
919 ParenHints, InitLists)) {
920 if (!InitLists.empty()) {
921 DiagnosticBuilder DB =
923 diag::note_init_list_at_beginning_of_macro_argument);
924 for (SourceRange Range : InitLists)
929 if (FixedNumArgs != MinArgsExpected)
932 DiagnosticBuilder DB = Diag(MacroName, diag::note_suggest_parens_for_macro);
933 for (SourceRange ParenLocation : ParenHints) {
934 DB << FixItHint::CreateInsertion(ParenLocation.getBegin(), "(");
935 DB << FixItHint::CreateInsertion(ParenLocation.getEnd(), ")");
937 ArgTokens.swap(FixedArgTokens);
938 NumActuals = FixedNumArgs;
941 // See MacroArgs instance var for description of this.
942 bool isVarargsElided = false;
944 if (ContainsCodeCompletionTok) {
945 // Recover from not-fully-formed macro invocation during code-completion.
948 EOFTok.setKind(tok::eof);
949 EOFTok.setLocation(Tok.getLocation());
951 for (; NumActuals < MinArgsExpected; ++NumActuals)
952 ArgTokens.push_back(EOFTok);
955 if (NumActuals < MinArgsExpected) {
956 // There are several cases where too few arguments is ok, handle them now.
957 if (NumActuals == 0 && MinArgsExpected == 1) {
958 // #define A(X) or #define A(...) ---> A()
960 // If there is exactly one argument, and that argument is missing,
961 // then we have an empty "()" argument empty list. This is fine, even if
962 // the macro expects one argument (the argument is just empty).
963 isVarargsElided = MI->isVariadic();
964 } else if ((FoundElidedComma || MI->isVariadic()) &&
965 (NumActuals+1 == MinArgsExpected || // A(x, ...) -> A(X)
966 (NumActuals == 0 && MinArgsExpected == 2))) {// A(x,...) -> A()
967 // Varargs where the named vararg parameter is missing: OK as extension.
971 // If the macro contains the comma pasting extension, the diagnostic
972 // is suppressed; we know we'll get another diagnostic later.
973 if (!MI->hasCommaPasting()) {
974 Diag(Tok, diag::ext_missing_varargs_arg);
975 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
976 << MacroName.getIdentifierInfo();
979 // Remember this occurred, allowing us to elide the comma when used for
981 // #define A(x, foo...) blah(a, ## foo)
982 // #define B(x, ...) blah(a, ## __VA_ARGS__)
983 // #define C(...) blah(a, ## __VA_ARGS__)
985 isVarargsElided = true;
986 } else if (!ContainsCodeCompletionTok) {
987 // Otherwise, emit the error.
988 Diag(Tok, diag::err_too_few_args_in_macro_invoc);
989 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
990 << MacroName.getIdentifierInfo();
994 // Add a marker EOF token to the end of the token list for this argument.
995 SourceLocation EndLoc = Tok.getLocation();
997 Tok.setKind(tok::eof);
998 Tok.setLocation(EndLoc);
1000 ArgTokens.push_back(Tok);
1002 // If we expect two arguments, add both as empty.
1003 if (NumActuals == 0 && MinArgsExpected == 2)
1004 ArgTokens.push_back(Tok);
1006 } else if (NumActuals > MinArgsExpected && !MI->isVariadic() &&
1007 !ContainsCodeCompletionTok) {
1008 // Emit the diagnostic at the macro name in case there is a missing ).
1009 // Emitting it at the , could be far away from the macro name.
1010 Diag(MacroName, diag::err_too_many_args_in_macro_invoc);
1011 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
1012 << MacroName.getIdentifierInfo();
1016 return MacroArgs::create(MI, ArgTokens, isVarargsElided, *this);
1019 /// \brief Keeps macro expanded tokens for TokenLexers.
1021 /// Works like a stack; a TokenLexer adds the macro expanded tokens that is
1022 /// going to lex in the cache and when it finishes the tokens are removed
1023 /// from the end of the cache.
1024 Token *Preprocessor::cacheMacroExpandedTokens(TokenLexer *tokLexer,
1025 ArrayRef<Token> tokens) {
1030 size_t newIndex = MacroExpandedTokens.size();
1031 bool cacheNeedsToGrow = tokens.size() >
1032 MacroExpandedTokens.capacity()-MacroExpandedTokens.size();
1033 MacroExpandedTokens.append(tokens.begin(), tokens.end());
1035 if (cacheNeedsToGrow) {
1036 // Go through all the TokenLexers whose 'Tokens' pointer points in the
1037 // buffer and update the pointers to the (potential) new buffer array.
1038 for (const auto &Lexer : MacroExpandingLexersStack) {
1039 TokenLexer *prevLexer;
1041 std::tie(prevLexer, tokIndex) = Lexer;
1042 prevLexer->Tokens = MacroExpandedTokens.data() + tokIndex;
1046 MacroExpandingLexersStack.push_back(std::make_pair(tokLexer, newIndex));
1047 return MacroExpandedTokens.data() + newIndex;
1050 void Preprocessor::removeCachedMacroExpandedTokensOfLastLexer() {
1051 assert(!MacroExpandingLexersStack.empty());
1052 size_t tokIndex = MacroExpandingLexersStack.back().second;
1053 assert(tokIndex < MacroExpandedTokens.size());
1054 // Pop the cached macro expanded tokens from the end.
1055 MacroExpandedTokens.resize(tokIndex);
1056 MacroExpandingLexersStack.pop_back();
1059 /// ComputeDATE_TIME - Compute the current time, enter it into the specified
1060 /// scratch buffer, then return DATELoc/TIMELoc locations with the position of
1061 /// the identifier tokens inserted.
1062 static void ComputeDATE_TIME(SourceLocation &DATELoc, SourceLocation &TIMELoc,
1064 time_t TT = time(nullptr);
1065 struct tm *TM = localtime(&TT);
1067 static const char * const Months[] = {
1068 "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
1072 SmallString<32> TmpBuffer;
1073 llvm::raw_svector_ostream TmpStream(TmpBuffer);
1074 TmpStream << llvm::format("\"%s %2d %4d\"", Months[TM->tm_mon],
1075 TM->tm_mday, TM->tm_year + 1900);
1077 TmpTok.startToken();
1078 PP.CreateString(TmpStream.str(), TmpTok);
1079 DATELoc = TmpTok.getLocation();
1083 SmallString<32> TmpBuffer;
1084 llvm::raw_svector_ostream TmpStream(TmpBuffer);
1085 TmpStream << llvm::format("\"%02d:%02d:%02d\"",
1086 TM->tm_hour, TM->tm_min, TM->tm_sec);
1088 TmpTok.startToken();
1089 PP.CreateString(TmpStream.str(), TmpTok);
1090 TIMELoc = TmpTok.getLocation();
1094 /// HasFeature - Return true if we recognize and implement the feature
1095 /// specified by the identifier as a standard language feature.
1096 static bool HasFeature(const Preprocessor &PP, StringRef Feature) {
1097 const LangOptions &LangOpts = PP.getLangOpts();
1099 // Normalize the feature name, __foo__ becomes foo.
1100 if (Feature.startswith("__") && Feature.endswith("__") && Feature.size() >= 4)
1101 Feature = Feature.substr(2, Feature.size() - 4);
1103 return llvm::StringSwitch<bool>(Feature)
1104 .Case("address_sanitizer",
1105 LangOpts.Sanitize.hasOneOf(SanitizerKind::Address |
1106 SanitizerKind::KernelAddress))
1107 .Case("hwaddress_sanitizer",
1108 LangOpts.Sanitize.hasOneOf(SanitizerKind::HWAddress))
1109 .Case("assume_nonnull", true)
1110 .Case("attribute_analyzer_noreturn", true)
1111 .Case("attribute_availability", true)
1112 .Case("attribute_availability_with_message", true)
1113 .Case("attribute_availability_app_extension", true)
1114 .Case("attribute_availability_with_version_underscores", true)
1115 .Case("attribute_availability_tvos", true)
1116 .Case("attribute_availability_watchos", true)
1117 .Case("attribute_availability_with_strict", true)
1118 .Case("attribute_availability_with_replacement", true)
1119 .Case("attribute_availability_in_templates", true)
1120 .Case("attribute_cf_returns_not_retained", true)
1121 .Case("attribute_cf_returns_retained", true)
1122 .Case("attribute_cf_returns_on_parameters", true)
1123 .Case("attribute_deprecated_with_message", true)
1124 .Case("attribute_deprecated_with_replacement", true)
1125 .Case("attribute_ext_vector_type", true)
1126 .Case("attribute_ns_returns_not_retained", true)
1127 .Case("attribute_ns_returns_retained", true)
1128 .Case("attribute_ns_consumes_self", true)
1129 .Case("attribute_ns_consumed", true)
1130 .Case("attribute_cf_consumed", true)
1131 .Case("attribute_objc_ivar_unused", true)
1132 .Case("attribute_objc_method_family", true)
1133 .Case("attribute_overloadable", true)
1134 .Case("attribute_unavailable_with_message", true)
1135 .Case("attribute_unused_on_fields", true)
1136 .Case("attribute_diagnose_if_objc", true)
1137 .Case("blocks", LangOpts.Blocks)
1138 .Case("c_thread_safety_attributes", true)
1139 .Case("cxx_exceptions", LangOpts.CXXExceptions)
1140 .Case("cxx_rtti", LangOpts.RTTI && LangOpts.RTTIData)
1141 .Case("enumerator_attributes", true)
1142 .Case("nullability", true)
1143 .Case("nullability_on_arrays", true)
1144 .Case("memory_sanitizer", LangOpts.Sanitize.has(SanitizerKind::Memory))
1145 .Case("thread_sanitizer", LangOpts.Sanitize.has(SanitizerKind::Thread))
1146 .Case("dataflow_sanitizer",
1147 LangOpts.Sanitize.has(SanitizerKind::DataFlow))
1148 .Case("efficiency_sanitizer",
1149 LangOpts.Sanitize.hasOneOf(SanitizerKind::Efficiency))
1150 .Case("scudo", LangOpts.Sanitize.hasOneOf(SanitizerKind::Scudo))
1151 // Objective-C features
1152 .Case("objc_arr", LangOpts.ObjCAutoRefCount) // FIXME: REMOVE?
1153 .Case("objc_arc", LangOpts.ObjCAutoRefCount)
1154 .Case("objc_arc_weak", LangOpts.ObjCWeak)
1155 .Case("objc_default_synthesize_properties", LangOpts.ObjC2)
1156 .Case("objc_fixed_enum", LangOpts.ObjC2)
1157 .Case("objc_instancetype", LangOpts.ObjC2)
1158 .Case("objc_kindof", LangOpts.ObjC2)
1159 .Case("objc_modules", LangOpts.ObjC2 && LangOpts.Modules)
1160 .Case("objc_nonfragile_abi", LangOpts.ObjCRuntime.isNonFragile())
1161 .Case("objc_property_explicit_atomic",
1162 true) // Does clang support explicit "atomic" keyword?
1163 .Case("objc_protocol_qualifier_mangling", true)
1164 .Case("objc_weak_class", LangOpts.ObjCRuntime.hasWeakClassImport())
1165 .Case("ownership_holds", true)
1166 .Case("ownership_returns", true)
1167 .Case("ownership_takes", true)
1168 .Case("objc_bool", true)
1169 .Case("objc_subscripting", LangOpts.ObjCRuntime.isNonFragile())
1170 .Case("objc_array_literals", LangOpts.ObjC2)
1171 .Case("objc_dictionary_literals", LangOpts.ObjC2)
1172 .Case("objc_boxed_expressions", LangOpts.ObjC2)
1173 .Case("objc_boxed_nsvalue_expressions", LangOpts.ObjC2)
1174 .Case("arc_cf_code_audited", true)
1175 .Case("objc_bridge_id", true)
1176 .Case("objc_bridge_id_on_typedefs", true)
1177 .Case("objc_generics", LangOpts.ObjC2)
1178 .Case("objc_generics_variance", LangOpts.ObjC2)
1179 .Case("objc_class_property", LangOpts.ObjC2)
1181 .Case("c_alignas", LangOpts.C11)
1182 .Case("c_alignof", LangOpts.C11)
1183 .Case("c_atomic", LangOpts.C11)
1184 .Case("c_generic_selections", LangOpts.C11)
1185 .Case("c_static_assert", LangOpts.C11)
1186 .Case("c_thread_local",
1187 LangOpts.C11 && PP.getTargetInfo().isTLSSupported())
1189 .Case("cxx_access_control_sfinae", LangOpts.CPlusPlus11)
1190 .Case("cxx_alias_templates", LangOpts.CPlusPlus11)
1191 .Case("cxx_alignas", LangOpts.CPlusPlus11)
1192 .Case("cxx_alignof", LangOpts.CPlusPlus11)
1193 .Case("cxx_atomic", LangOpts.CPlusPlus11)
1194 .Case("cxx_attributes", LangOpts.CPlusPlus11)
1195 .Case("cxx_auto_type", LangOpts.CPlusPlus11)
1196 .Case("cxx_constexpr", LangOpts.CPlusPlus11)
1197 .Case("cxx_constexpr_string_builtins", LangOpts.CPlusPlus11)
1198 .Case("cxx_decltype", LangOpts.CPlusPlus11)
1199 .Case("cxx_decltype_incomplete_return_types", LangOpts.CPlusPlus11)
1200 .Case("cxx_default_function_template_args", LangOpts.CPlusPlus11)
1201 .Case("cxx_defaulted_functions", LangOpts.CPlusPlus11)
1202 .Case("cxx_delegating_constructors", LangOpts.CPlusPlus11)
1203 .Case("cxx_deleted_functions", LangOpts.CPlusPlus11)
1204 .Case("cxx_explicit_conversions", LangOpts.CPlusPlus11)
1205 .Case("cxx_generalized_initializers", LangOpts.CPlusPlus11)
1206 .Case("cxx_implicit_moves", LangOpts.CPlusPlus11)
1207 .Case("cxx_inheriting_constructors", LangOpts.CPlusPlus11)
1208 .Case("cxx_inline_namespaces", LangOpts.CPlusPlus11)
1209 .Case("cxx_lambdas", LangOpts.CPlusPlus11)
1210 .Case("cxx_local_type_template_args", LangOpts.CPlusPlus11)
1211 .Case("cxx_nonstatic_member_init", LangOpts.CPlusPlus11)
1212 .Case("cxx_noexcept", LangOpts.CPlusPlus11)
1213 .Case("cxx_nullptr", LangOpts.CPlusPlus11)
1214 .Case("cxx_override_control", LangOpts.CPlusPlus11)
1215 .Case("cxx_range_for", LangOpts.CPlusPlus11)
1216 .Case("cxx_raw_string_literals", LangOpts.CPlusPlus11)
1217 .Case("cxx_reference_qualified_functions", LangOpts.CPlusPlus11)
1218 .Case("cxx_rvalue_references", LangOpts.CPlusPlus11)
1219 .Case("cxx_strong_enums", LangOpts.CPlusPlus11)
1220 .Case("cxx_static_assert", LangOpts.CPlusPlus11)
1221 .Case("cxx_thread_local",
1222 LangOpts.CPlusPlus11 && PP.getTargetInfo().isTLSSupported())
1223 .Case("cxx_trailing_return", LangOpts.CPlusPlus11)
1224 .Case("cxx_unicode_literals", LangOpts.CPlusPlus11)
1225 .Case("cxx_unrestricted_unions", LangOpts.CPlusPlus11)
1226 .Case("cxx_user_literals", LangOpts.CPlusPlus11)
1227 .Case("cxx_variadic_templates", LangOpts.CPlusPlus11)
1229 .Case("cxx_aggregate_nsdmi", LangOpts.CPlusPlus14)
1230 .Case("cxx_binary_literals", LangOpts.CPlusPlus14)
1231 .Case("cxx_contextual_conversions", LangOpts.CPlusPlus14)
1232 .Case("cxx_decltype_auto", LangOpts.CPlusPlus14)
1233 .Case("cxx_generic_lambdas", LangOpts.CPlusPlus14)
1234 .Case("cxx_init_captures", LangOpts.CPlusPlus14)
1235 .Case("cxx_relaxed_constexpr", LangOpts.CPlusPlus14)
1236 .Case("cxx_return_type_deduction", LangOpts.CPlusPlus14)
1237 .Case("cxx_variable_templates", LangOpts.CPlusPlus14)
1238 // NOTE: For features covered by SD-6, it is preferable to provide *only*
1239 // the SD-6 macro and not a __has_feature check.
1242 //.Case("cxx_runtime_arrays", LangOpts.CPlusPlusTSArrays)
1243 //.Case("cxx_concepts", LangOpts.CPlusPlusTSConcepts)
1244 // FIXME: Should this be __has_feature or __has_extension?
1245 //.Case("raw_invocation_type", LangOpts.CPlusPlus)
1247 // N.B. Additional type traits should not be added to the following list.
1248 // Instead, they should be detected by has_extension.
1249 .Case("has_nothrow_assign", LangOpts.CPlusPlus)
1250 .Case("has_nothrow_copy", LangOpts.CPlusPlus)
1251 .Case("has_nothrow_constructor", LangOpts.CPlusPlus)
1252 .Case("has_trivial_assign", LangOpts.CPlusPlus)
1253 .Case("has_trivial_copy", LangOpts.CPlusPlus)
1254 .Case("has_trivial_constructor", LangOpts.CPlusPlus)
1255 .Case("has_trivial_destructor", LangOpts.CPlusPlus)
1256 .Case("has_virtual_destructor", LangOpts.CPlusPlus)
1257 .Case("is_abstract", LangOpts.CPlusPlus)
1258 .Case("is_base_of", LangOpts.CPlusPlus)
1259 .Case("is_class", LangOpts.CPlusPlus)
1260 .Case("is_constructible", LangOpts.CPlusPlus)
1261 .Case("is_convertible_to", LangOpts.CPlusPlus)
1262 .Case("is_empty", LangOpts.CPlusPlus)
1263 .Case("is_enum", LangOpts.CPlusPlus)
1264 .Case("is_final", LangOpts.CPlusPlus)
1265 .Case("is_literal", LangOpts.CPlusPlus)
1266 .Case("is_standard_layout", LangOpts.CPlusPlus)
1267 .Case("is_pod", LangOpts.CPlusPlus)
1268 .Case("is_polymorphic", LangOpts.CPlusPlus)
1269 .Case("is_sealed", LangOpts.CPlusPlus && LangOpts.MicrosoftExt)
1270 .Case("is_trivial", LangOpts.CPlusPlus)
1271 .Case("is_trivially_assignable", LangOpts.CPlusPlus)
1272 .Case("is_trivially_constructible", LangOpts.CPlusPlus)
1273 .Case("is_trivially_copyable", LangOpts.CPlusPlus)
1274 .Case("is_union", LangOpts.CPlusPlus)
1275 .Case("modules", LangOpts.Modules)
1276 .Case("safe_stack", LangOpts.Sanitize.has(SanitizerKind::SafeStack))
1277 .Case("tls", PP.getTargetInfo().isTLSSupported())
1278 .Case("underlying_type", LangOpts.CPlusPlus)
1282 /// HasExtension - Return true if we recognize and implement the feature
1283 /// specified by the identifier, either as an extension or a standard language
1285 static bool HasExtension(const Preprocessor &PP, StringRef Extension) {
1286 if (HasFeature(PP, Extension))
1289 // If the use of an extension results in an error diagnostic, extensions are
1290 // effectively unavailable, so just return false here.
1291 if (PP.getDiagnostics().getExtensionHandlingBehavior() >=
1292 diag::Severity::Error)
1295 const LangOptions &LangOpts = PP.getLangOpts();
1297 // Normalize the extension name, __foo__ becomes foo.
1298 if (Extension.startswith("__") && Extension.endswith("__") &&
1299 Extension.size() >= 4)
1300 Extension = Extension.substr(2, Extension.size() - 4);
1302 // Because we inherit the feature list from HasFeature, this string switch
1303 // must be less restrictive than HasFeature's.
1304 return llvm::StringSwitch<bool>(Extension)
1305 // C11 features supported by other languages as extensions.
1306 .Case("c_alignas", true)
1307 .Case("c_alignof", true)
1308 .Case("c_atomic", true)
1309 .Case("c_generic_selections", true)
1310 .Case("c_static_assert", true)
1311 .Case("c_thread_local", PP.getTargetInfo().isTLSSupported())
1312 // C++11 features supported by other languages as extensions.
1313 .Case("cxx_atomic", LangOpts.CPlusPlus)
1314 .Case("cxx_deleted_functions", LangOpts.CPlusPlus)
1315 .Case("cxx_explicit_conversions", LangOpts.CPlusPlus)
1316 .Case("cxx_inline_namespaces", LangOpts.CPlusPlus)
1317 .Case("cxx_local_type_template_args", LangOpts.CPlusPlus)
1318 .Case("cxx_nonstatic_member_init", LangOpts.CPlusPlus)
1319 .Case("cxx_override_control", LangOpts.CPlusPlus)
1320 .Case("cxx_range_for", LangOpts.CPlusPlus)
1321 .Case("cxx_reference_qualified_functions", LangOpts.CPlusPlus)
1322 .Case("cxx_rvalue_references", LangOpts.CPlusPlus)
1323 .Case("cxx_variadic_templates", LangOpts.CPlusPlus)
1324 // C++14 features supported by other languages as extensions.
1325 .Case("cxx_binary_literals", true)
1326 .Case("cxx_init_captures", LangOpts.CPlusPlus11)
1327 .Case("cxx_variable_templates", LangOpts.CPlusPlus)
1328 // Miscellaneous language extensions
1329 .Case("overloadable_unmarked", true)
1333 /// EvaluateHasIncludeCommon - Process a '__has_include("path")'
1334 /// or '__has_include_next("path")' expression.
1335 /// Returns true if successful.
1336 static bool EvaluateHasIncludeCommon(Token &Tok,
1337 IdentifierInfo *II, Preprocessor &PP,
1338 const DirectoryLookup *LookupFrom,
1339 const FileEntry *LookupFromFile) {
1340 // Save the location of the current token. If a '(' is later found, use
1341 // that location. If not, use the end of this location instead.
1342 SourceLocation LParenLoc = Tok.getLocation();
1344 // These expressions are only allowed within a preprocessor directive.
1345 if (!PP.isParsingIfOrElifDirective()) {
1346 PP.Diag(LParenLoc, diag::err_pp_directive_required) << II->getName();
1347 // Return a valid identifier token.
1348 assert(Tok.is(tok::identifier));
1349 Tok.setIdentifierInfo(II);
1354 PP.LexNonComment(Tok);
1356 // Ensure we have a '('.
1357 if (Tok.isNot(tok::l_paren)) {
1358 // No '(', use end of last token.
1359 LParenLoc = PP.getLocForEndOfToken(LParenLoc);
1360 PP.Diag(LParenLoc, diag::err_pp_expected_after) << II << tok::l_paren;
1361 // If the next token looks like a filename or the start of one,
1362 // assume it is and process it as such.
1363 if (!Tok.is(tok::angle_string_literal) && !Tok.is(tok::string_literal) &&
1367 // Save '(' location for possible missing ')' message.
1368 LParenLoc = Tok.getLocation();
1370 if (PP.getCurrentLexer()) {
1371 // Get the file name.
1372 PP.getCurrentLexer()->LexIncludeFilename(Tok);
1374 // We're in a macro, so we can't use LexIncludeFilename; just
1375 // grab the next token.
1380 // Reserve a buffer to get the spelling.
1381 SmallString<128> FilenameBuffer;
1383 SourceLocation EndLoc;
1385 switch (Tok.getKind()) {
1387 // If the token kind is EOD, the error has already been diagnosed.
1390 case tok::angle_string_literal:
1391 case tok::string_literal: {
1392 bool Invalid = false;
1393 Filename = PP.getSpelling(Tok, FilenameBuffer, &Invalid);
1400 // This could be a <foo/bar.h> file coming from a macro expansion. In this
1401 // case, glue the tokens together into FilenameBuffer and interpret those.
1402 FilenameBuffer.push_back('<');
1403 if (PP.ConcatenateIncludeName(FilenameBuffer, EndLoc)) {
1404 // Let the caller know a <eod> was found by changing the Token kind.
1405 Tok.setKind(tok::eod);
1406 return false; // Found <eod> but no ">"? Diagnostic already emitted.
1408 Filename = FilenameBuffer;
1411 PP.Diag(Tok.getLocation(), diag::err_pp_expects_filename);
1415 SourceLocation FilenameLoc = Tok.getLocation();
1418 PP.LexNonComment(Tok);
1420 // Ensure we have a trailing ).
1421 if (Tok.isNot(tok::r_paren)) {
1422 PP.Diag(PP.getLocForEndOfToken(FilenameLoc), diag::err_pp_expected_after)
1423 << II << tok::r_paren;
1424 PP.Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1428 bool isAngled = PP.GetIncludeFilenameSpelling(Tok.getLocation(), Filename);
1429 // If GetIncludeFilenameSpelling set the start ptr to null, there was an
1431 if (Filename.empty())
1434 // Search include directories.
1435 const DirectoryLookup *CurDir;
1436 const FileEntry *File =
1437 PP.LookupFile(FilenameLoc, Filename, isAngled, LookupFrom, LookupFromFile,
1438 CurDir, nullptr, nullptr, nullptr, nullptr);
1440 // Get the result value. A result of true means the file exists.
1441 return File != nullptr;
1444 /// EvaluateHasInclude - Process a '__has_include("path")' expression.
1445 /// Returns true if successful.
1446 static bool EvaluateHasInclude(Token &Tok, IdentifierInfo *II,
1448 return EvaluateHasIncludeCommon(Tok, II, PP, nullptr, nullptr);
1451 /// EvaluateHasIncludeNext - Process '__has_include_next("path")' expression.
1452 /// Returns true if successful.
1453 static bool EvaluateHasIncludeNext(Token &Tok,
1454 IdentifierInfo *II, Preprocessor &PP) {
1455 // __has_include_next is like __has_include, except that we start
1456 // searching after the current found directory. If we can't do this,
1457 // issue a diagnostic.
1458 // FIXME: Factor out duplication with
1459 // Preprocessor::HandleIncludeNextDirective.
1460 const DirectoryLookup *Lookup = PP.GetCurDirLookup();
1461 const FileEntry *LookupFromFile = nullptr;
1462 if (PP.isInPrimaryFile() && PP.getLangOpts().IsHeaderFile) {
1463 // If the main file is a header, then it's either for PCH/AST generation,
1464 // or libclang opened it. Either way, handle it as a normal include below
1465 // and do not complain about __has_include_next.
1466 } else if (PP.isInPrimaryFile()) {
1468 PP.Diag(Tok, diag::pp_include_next_in_primary);
1469 } else if (PP.getCurrentLexerSubmodule()) {
1470 // Start looking up in the directory *after* the one in which the current
1471 // file would be found, if any.
1472 assert(PP.getCurrentLexer() && "#include_next directive in macro?");
1473 LookupFromFile = PP.getCurrentLexer()->getFileEntry();
1475 } else if (!Lookup) {
1476 PP.Diag(Tok, diag::pp_include_next_absolute_path);
1478 // Start looking up in the next directory.
1482 return EvaluateHasIncludeCommon(Tok, II, PP, Lookup, LookupFromFile);
1485 /// \brief Process single-argument builtin feature-like macros that return
1487 static void EvaluateFeatureLikeBuiltinMacro(llvm::raw_svector_ostream& OS,
1488 Token &Tok, IdentifierInfo *II,
1492 bool &HasLexedNextTok)> Op) {
1493 // Parse the initial '('.
1494 PP.LexUnexpandedToken(Tok);
1495 if (Tok.isNot(tok::l_paren)) {
1496 PP.Diag(Tok.getLocation(), diag::err_pp_expected_after) << II
1499 // Provide a dummy '0' value on output stream to elide further errors.
1500 if (!Tok.isOneOf(tok::eof, tok::eod)) {
1502 Tok.setKind(tok::numeric_constant);
1507 unsigned ParenDepth = 1;
1508 SourceLocation LParenLoc = Tok.getLocation();
1509 llvm::Optional<int> Result;
1512 bool SuppressDiagnostic = false;
1514 // Parse next token.
1515 PP.LexUnexpandedToken(Tok);
1518 switch (Tok.getKind()) {
1521 // Don't provide even a dummy value if the eod or eof marker is
1522 // reached. Simply provide a diagnostic.
1523 PP.Diag(Tok.getLocation(), diag::err_unterm_macro_invoc);
1527 if (!SuppressDiagnostic) {
1528 PP.Diag(Tok.getLocation(), diag::err_too_many_args_in_macro_invoc);
1529 SuppressDiagnostic = true;
1535 if (Result.hasValue())
1537 if (!SuppressDiagnostic) {
1538 PP.Diag(Tok.getLocation(), diag::err_pp_nested_paren) << II;
1539 SuppressDiagnostic = true;
1544 if (--ParenDepth > 0)
1547 // The last ')' has been reached; return the value if one found or
1548 // a diagnostic and a dummy value.
1549 if (Result.hasValue())
1550 OS << Result.getValue();
1553 if (!SuppressDiagnostic)
1554 PP.Diag(Tok.getLocation(), diag::err_too_few_args_in_macro_invoc);
1556 Tok.setKind(tok::numeric_constant);
1560 // Parse the macro argument, if one not found so far.
1561 if (Result.hasValue())
1564 bool HasLexedNextToken = false;
1565 Result = Op(Tok, HasLexedNextToken);
1567 if (HasLexedNextToken)
1573 // Diagnose missing ')'.
1574 if (!SuppressDiagnostic) {
1575 if (auto Diag = PP.Diag(Tok.getLocation(), diag::err_pp_expected_after)) {
1576 if (IdentifierInfo *LastII = ResultTok.getIdentifierInfo())
1579 Diag << ResultTok.getKind();
1580 Diag << tok::r_paren << ResultTok.getLocation();
1582 PP.Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1583 SuppressDiagnostic = true;
1588 /// \brief Helper function to return the IdentifierInfo structure of a Token
1589 /// or generate a diagnostic if none available.
1590 static IdentifierInfo *ExpectFeatureIdentifierInfo(Token &Tok,
1594 if (!Tok.isAnnotation() && (II = Tok.getIdentifierInfo()))
1597 PP.Diag(Tok.getLocation(), DiagID);
1601 /// Implements the __is_target_arch builtin macro.
1602 static bool isTargetArch(const TargetInfo &TI, const IdentifierInfo *II) {
1603 std::string ArchName = II->getName().lower() + "--";
1604 llvm::Triple Arch(ArchName);
1605 const llvm::Triple &TT = TI.getTriple();
1607 // arm matches thumb or thumbv7. armv7 matches thumbv7.
1608 if ((Arch.getSubArch() == llvm::Triple::NoSubArch ||
1609 Arch.getSubArch() == TT.getSubArch()) &&
1610 ((TT.getArch() == llvm::Triple::thumb &&
1611 Arch.getArch() == llvm::Triple::arm) ||
1612 (TT.getArch() == llvm::Triple::thumbeb &&
1613 Arch.getArch() == llvm::Triple::armeb)))
1616 // Check the parsed arch when it has no sub arch to allow Clang to
1617 // match thumb to thumbv7 but to prohibit matching thumbv6 to thumbv7.
1618 return (Arch.getSubArch() == llvm::Triple::NoSubArch ||
1619 Arch.getSubArch() == TT.getSubArch()) &&
1620 Arch.getArch() == TT.getArch();
1623 /// Implements the __is_target_vendor builtin macro.
1624 static bool isTargetVendor(const TargetInfo &TI, const IdentifierInfo *II) {
1625 StringRef VendorName = TI.getTriple().getVendorName();
1626 if (VendorName.empty())
1627 VendorName = "unknown";
1628 return VendorName.equals_lower(II->getName());
1631 /// Implements the __is_target_os builtin macro.
1632 static bool isTargetOS(const TargetInfo &TI, const IdentifierInfo *II) {
1633 std::string OSName =
1634 (llvm::Twine("unknown-unknown-") + II->getName().lower()).str();
1635 llvm::Triple OS(OSName);
1636 if (OS.getOS() == llvm::Triple::Darwin) {
1637 // Darwin matches macos, ios, etc.
1638 return TI.getTriple().isOSDarwin();
1640 return TI.getTriple().getOS() == OS.getOS();
1643 /// Implements the __is_target_environment builtin macro.
1644 static bool isTargetEnvironment(const TargetInfo &TI,
1645 const IdentifierInfo *II) {
1646 std::string EnvName = (llvm::Twine("---") + II->getName().lower()).str();
1647 llvm::Triple Env(EnvName);
1648 return TI.getTriple().getEnvironment() == Env.getEnvironment();
1651 /// ExpandBuiltinMacro - If an identifier token is read that is to be expanded
1652 /// as a builtin macro, handle it and return the next token as 'Tok'.
1653 void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
1654 // Figure out which token this is.
1655 IdentifierInfo *II = Tok.getIdentifierInfo();
1656 assert(II && "Can't be a macro without id info!");
1658 // If this is an _Pragma or Microsoft __pragma directive, expand it,
1659 // invoke the pragma handler, then lex the token after it.
1660 if (II == Ident_Pragma)
1661 return Handle_Pragma(Tok);
1662 else if (II == Ident__pragma) // in non-MS mode this is null
1663 return HandleMicrosoft__pragma(Tok);
1665 ++NumBuiltinMacroExpanded;
1667 SmallString<128> TmpBuffer;
1668 llvm::raw_svector_ostream OS(TmpBuffer);
1670 // Set up the return result.
1671 Tok.setIdentifierInfo(nullptr);
1672 Tok.clearFlag(Token::NeedsCleaning);
1674 if (II == Ident__LINE__) {
1675 // C99 6.10.8: "__LINE__: The presumed line number (within the current
1676 // source file) of the current source line (an integer constant)". This can
1677 // be affected by #line.
1678 SourceLocation Loc = Tok.getLocation();
1680 // Advance to the location of the first _, this might not be the first byte
1681 // of the token if it starts with an escaped newline.
1682 Loc = AdvanceToTokenCharacter(Loc, 0);
1684 // One wrinkle here is that GCC expands __LINE__ to location of the *end* of
1685 // a macro expansion. This doesn't matter for object-like macros, but
1686 // can matter for a function-like macro that expands to contain __LINE__.
1687 // Skip down through expansion points until we find a file loc for the
1688 // end of the expansion history.
1689 Loc = SourceMgr.getExpansionRange(Loc).second;
1690 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Loc);
1692 // __LINE__ expands to a simple numeric value.
1693 OS << (PLoc.isValid()? PLoc.getLine() : 1);
1694 Tok.setKind(tok::numeric_constant);
1695 } else if (II == Ident__FILE__ || II == Ident__BASE_FILE__) {
1696 // C99 6.10.8: "__FILE__: The presumed name of the current source file (a
1697 // character string literal)". This can be affected by #line.
1698 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
1700 // __BASE_FILE__ is a GNU extension that returns the top of the presumed
1701 // #include stack instead of the current file.
1702 if (II == Ident__BASE_FILE__ && PLoc.isValid()) {
1703 SourceLocation NextLoc = PLoc.getIncludeLoc();
1704 while (NextLoc.isValid()) {
1705 PLoc = SourceMgr.getPresumedLoc(NextLoc);
1706 if (PLoc.isInvalid())
1709 NextLoc = PLoc.getIncludeLoc();
1713 // Escape this filename. Turn '\' -> '\\' '"' -> '\"'
1714 SmallString<128> FN;
1715 if (PLoc.isValid()) {
1716 FN += PLoc.getFilename();
1717 Lexer::Stringify(FN);
1718 OS << '"' << FN << '"';
1720 Tok.setKind(tok::string_literal);
1721 } else if (II == Ident__DATE__) {
1722 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1723 if (!DATELoc.isValid())
1724 ComputeDATE_TIME(DATELoc, TIMELoc, *this);
1725 Tok.setKind(tok::string_literal);
1726 Tok.setLength(strlen("\"Mmm dd yyyy\""));
1727 Tok.setLocation(SourceMgr.createExpansionLoc(DATELoc, Tok.getLocation(),
1731 } else if (II == Ident__TIME__) {
1732 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1733 if (!TIMELoc.isValid())
1734 ComputeDATE_TIME(DATELoc, TIMELoc, *this);
1735 Tok.setKind(tok::string_literal);
1736 Tok.setLength(strlen("\"hh:mm:ss\""));
1737 Tok.setLocation(SourceMgr.createExpansionLoc(TIMELoc, Tok.getLocation(),
1741 } else if (II == Ident__INCLUDE_LEVEL__) {
1742 // Compute the presumed include depth of this token. This can be affected
1743 // by GNU line markers.
1746 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
1747 if (PLoc.isValid()) {
1748 PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
1749 for (; PLoc.isValid(); ++Depth)
1750 PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
1753 // __INCLUDE_LEVEL__ expands to a simple numeric value.
1755 Tok.setKind(tok::numeric_constant);
1756 } else if (II == Ident__TIMESTAMP__) {
1757 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1758 // MSVC, ICC, GCC, VisualAge C++ extension. The generated string should be
1759 // of the form "Ddd Mmm dd hh::mm::ss yyyy", which is returned by asctime.
1761 // Get the file that we are lexing out of. If we're currently lexing from
1762 // a macro, dig into the include stack.
1763 const FileEntry *CurFile = nullptr;
1764 PreprocessorLexer *TheLexer = getCurrentFileLexer();
1767 CurFile = SourceMgr.getFileEntryForID(TheLexer->getFileID());
1771 time_t TT = CurFile->getModificationTime();
1772 struct tm *TM = localtime(&TT);
1773 Result = asctime(TM);
1775 Result = "??? ??? ?? ??:??:?? ????\n";
1777 // Surround the string with " and strip the trailing newline.
1778 OS << '"' << StringRef(Result).drop_back() << '"';
1779 Tok.setKind(tok::string_literal);
1780 } else if (II == Ident__COUNTER__) {
1781 // __COUNTER__ expands to a simple numeric value.
1782 OS << CounterValue++;
1783 Tok.setKind(tok::numeric_constant);
1784 } else if (II == Ident__has_feature) {
1785 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1786 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1787 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1788 diag::err_feature_check_malformed);
1789 return II && HasFeature(*this, II->getName());
1791 } else if (II == Ident__has_extension) {
1792 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1793 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1794 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1795 diag::err_feature_check_malformed);
1796 return II && HasExtension(*this, II->getName());
1798 } else if (II == Ident__has_builtin) {
1799 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1800 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1801 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1802 diag::err_feature_check_malformed);
1805 else if (II->getBuiltinID() != 0)
1808 const LangOptions &LangOpts = getLangOpts();
1809 return llvm::StringSwitch<bool>(II->getName())
1810 .Case("__make_integer_seq", LangOpts.CPlusPlus)
1811 .Case("__type_pack_element", LangOpts.CPlusPlus)
1812 .Case("__builtin_available", true)
1813 .Case("__is_target_arch", true)
1814 .Case("__is_target_vendor", true)
1815 .Case("__is_target_os", true)
1816 .Case("__is_target_environment", true)
1820 } else if (II == Ident__is_identifier) {
1821 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1822 [](Token &Tok, bool &HasLexedNextToken) -> int {
1823 return Tok.is(tok::identifier);
1825 } else if (II == Ident__has_attribute) {
1826 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1827 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1828 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1829 diag::err_feature_check_malformed);
1830 return II ? hasAttribute(AttrSyntax::GNU, nullptr, II,
1831 getTargetInfo(), getLangOpts()) : 0;
1833 } else if (II == Ident__has_declspec) {
1834 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1835 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1836 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1837 diag::err_feature_check_malformed);
1838 return II ? hasAttribute(AttrSyntax::Declspec, nullptr, II,
1839 getTargetInfo(), getLangOpts()) : 0;
1841 } else if (II == Ident__has_cpp_attribute ||
1842 II == Ident__has_c_attribute) {
1843 bool IsCXX = II == Ident__has_cpp_attribute;
1844 EvaluateFeatureLikeBuiltinMacro(
1845 OS, Tok, II, *this, [&](Token &Tok, bool &HasLexedNextToken) -> int {
1846 IdentifierInfo *ScopeII = nullptr;
1847 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1848 Tok, *this, diag::err_feature_check_malformed);
1852 // It is possible to receive a scope token. Read the "::", if it is
1853 // available, and the subsequent identifier.
1854 LexUnexpandedToken(Tok);
1855 if (Tok.isNot(tok::coloncolon))
1856 HasLexedNextToken = true;
1859 LexUnexpandedToken(Tok);
1860 II = ExpectFeatureIdentifierInfo(Tok, *this,
1861 diag::err_feature_check_malformed);
1864 AttrSyntax Syntax = IsCXX ? AttrSyntax::CXX : AttrSyntax::C;
1865 return II ? hasAttribute(Syntax, ScopeII, II, getTargetInfo(),
1869 } else if (II == Ident__has_include ||
1870 II == Ident__has_include_next) {
1871 // The argument to these two builtins should be a parenthesized
1872 // file name string literal using angle brackets (<>) or
1873 // double-quotes ("").
1875 if (II == Ident__has_include)
1876 Value = EvaluateHasInclude(Tok, II, *this);
1878 Value = EvaluateHasIncludeNext(Tok, II, *this);
1880 if (Tok.isNot(tok::r_paren))
1883 Tok.setKind(tok::numeric_constant);
1884 } else if (II == Ident__has_warning) {
1885 // The argument should be a parenthesized string literal.
1886 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1887 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1888 std::string WarningName;
1889 SourceLocation StrStartLoc = Tok.getLocation();
1891 HasLexedNextToken = Tok.is(tok::string_literal);
1892 if (!FinishLexStringLiteral(Tok, WarningName, "'__has_warning'",
1893 /*MacroExpansion=*/false))
1896 // FIXME: Should we accept "-R..." flags here, or should that be
1897 // handled by a separate __has_remark?
1898 if (WarningName.size() < 3 || WarningName[0] != '-' ||
1899 WarningName[1] != 'W') {
1900 Diag(StrStartLoc, diag::warn_has_warning_invalid_option);
1904 // Finally, check if the warning flags maps to a diagnostic group.
1905 // We construct a SmallVector here to talk to getDiagnosticIDs().
1906 // Although we don't use the result, this isn't a hot path, and not
1907 // worth special casing.
1908 SmallVector<diag::kind, 10> Diags;
1909 return !getDiagnostics().getDiagnosticIDs()->
1910 getDiagnosticsInGroup(diag::Flavor::WarningOrError,
1911 WarningName.substr(2), Diags);
1913 } else if (II == Ident__building_module) {
1914 // The argument to this builtin should be an identifier. The
1915 // builtin evaluates to 1 when that identifier names the module we are
1916 // currently building.
1917 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1918 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1919 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1920 diag::err_expected_id_building_module);
1921 return getLangOpts().isCompilingModule() && II &&
1922 (II->getName() == getLangOpts().CurrentModule);
1924 } else if (II == Ident__MODULE__) {
1925 // The current module as an identifier.
1926 OS << getLangOpts().CurrentModule;
1927 IdentifierInfo *ModuleII = getIdentifierInfo(getLangOpts().CurrentModule);
1928 Tok.setIdentifierInfo(ModuleII);
1929 Tok.setKind(ModuleII->getTokenID());
1930 } else if (II == Ident__identifier) {
1931 SourceLocation Loc = Tok.getLocation();
1933 // We're expecting '__identifier' '(' identifier ')'. Try to recover
1934 // if the parens are missing.
1936 if (Tok.isNot(tok::l_paren)) {
1937 // No '(', use end of last token.
1938 Diag(getLocForEndOfToken(Loc), diag::err_pp_expected_after)
1939 << II << tok::l_paren;
1940 // If the next token isn't valid as our argument, we can't recover.
1941 if (!Tok.isAnnotation() && Tok.getIdentifierInfo())
1942 Tok.setKind(tok::identifier);
1946 SourceLocation LParenLoc = Tok.getLocation();
1949 if (!Tok.isAnnotation() && Tok.getIdentifierInfo())
1950 Tok.setKind(tok::identifier);
1952 Diag(Tok.getLocation(), diag::err_pp_identifier_arg_not_identifier)
1954 // Don't walk past anything that's not a real token.
1955 if (Tok.isOneOf(tok::eof, tok::eod) || Tok.isAnnotation())
1959 // Discard the ')', preserving 'Tok' as our result.
1961 LexNonComment(RParen);
1962 if (RParen.isNot(tok::r_paren)) {
1963 Diag(getLocForEndOfToken(Tok.getLocation()), diag::err_pp_expected_after)
1964 << Tok.getKind() << tok::r_paren;
1965 Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1968 } else if (II == Ident__is_target_arch) {
1969 EvaluateFeatureLikeBuiltinMacro(
1970 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1971 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1972 Tok, *this, diag::err_feature_check_malformed);
1973 return II && isTargetArch(getTargetInfo(), II);
1975 } else if (II == Ident__is_target_vendor) {
1976 EvaluateFeatureLikeBuiltinMacro(
1977 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1978 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1979 Tok, *this, diag::err_feature_check_malformed);
1980 return II && isTargetVendor(getTargetInfo(), II);
1982 } else if (II == Ident__is_target_os) {
1983 EvaluateFeatureLikeBuiltinMacro(
1984 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1985 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1986 Tok, *this, diag::err_feature_check_malformed);
1987 return II && isTargetOS(getTargetInfo(), II);
1989 } else if (II == Ident__is_target_environment) {
1990 EvaluateFeatureLikeBuiltinMacro(
1991 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1992 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1993 Tok, *this, diag::err_feature_check_malformed);
1994 return II && isTargetEnvironment(getTargetInfo(), II);
1997 llvm_unreachable("Unknown identifier!");
1999 CreateString(OS.str(), Tok, Tok.getLocation(), Tok.getLocation());
2002 void Preprocessor::markMacroAsUsed(MacroInfo *MI) {
2003 // If the 'used' status changed, and the macro requires 'unused' warning,
2004 // remove its SourceLocation from the warn-for-unused-macro locations.
2005 if (MI->isWarnIfUnused() && !MI->isUsed())
2006 WarnUnusedMacroLocs.erase(MI->getDefinitionLoc());
2007 MI->setIsUsed(true);