1 //===--- PPMacroExpansion.cpp - Top level Macro Expansion -----------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements the top level handling of macro expansion for the
12 //===----------------------------------------------------------------------===//
14 #include "clang/Basic/Attributes.h"
15 #include "clang/Basic/Builtins.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/HeaderSearch.h"
27 #include "clang/Lex/LexDiagnostic.h"
28 #include "clang/Lex/LiteralSupport.h"
29 #include "clang/Lex/MacroArgs.h"
30 #include "clang/Lex/MacroInfo.h"
31 #include "clang/Lex/Preprocessor.h"
32 #include "clang/Lex/PreprocessorLexer.h"
33 #include "clang/Lex/PreprocessorOptions.h"
34 #include "clang/Lex/Token.h"
35 #include "llvm/ADT/ArrayRef.h"
36 #include "llvm/ADT/DenseMap.h"
37 #include "llvm/ADT/DenseSet.h"
38 #include "llvm/ADT/FoldingSet.h"
39 #include "llvm/ADT/None.h"
40 #include "llvm/ADT/Optional.h"
41 #include "llvm/ADT/STLExtras.h"
42 #include "llvm/ADT/SmallString.h"
43 #include "llvm/ADT/SmallVector.h"
44 #include "llvm/ADT/StringRef.h"
45 #include "llvm/ADT/StringSwitch.h"
46 #include "llvm/Support/Casting.h"
47 #include "llvm/Support/ErrorHandling.h"
48 #include "llvm/Support/Format.h"
49 #include "llvm/Support/Path.h"
50 #include "llvm/Support/raw_ostream.h"
60 using namespace clang;
63 Preprocessor::getLocalMacroDirectiveHistory(const IdentifierInfo *II) const {
64 if (!II->hadMacroDefinition())
66 auto Pos = CurSubmoduleState->Macros.find(II);
67 return Pos == CurSubmoduleState->Macros.end() ? nullptr
68 : Pos->second.getLatest();
71 void Preprocessor::appendMacroDirective(IdentifierInfo *II, MacroDirective *MD){
72 assert(MD && "MacroDirective should be non-zero!");
73 assert(!MD->getPrevious() && "Already attached to a MacroDirective history.");
75 MacroState &StoredMD = CurSubmoduleState->Macros[II];
76 auto *OldMD = StoredMD.getLatest();
77 MD->setPrevious(OldMD);
78 StoredMD.setLatest(MD);
79 StoredMD.overrideActiveModuleMacros(*this, II);
81 if (needModuleMacros()) {
82 // Track that we created a new macro directive, so we know we should
83 // consider building a ModuleMacro for it when we get to the end of
85 PendingModuleMacroNames.push_back(II);
88 // Set up the identifier as having associated macro history.
89 II->setHasMacroDefinition(true);
90 if (!MD->isDefined() && LeafModuleMacros.find(II) == LeafModuleMacros.end())
91 II->setHasMacroDefinition(false);
93 II->setChangedSinceDeserialization();
96 void Preprocessor::setLoadedMacroDirective(IdentifierInfo *II,
99 // Normally, when a macro is defined, it goes through appendMacroDirective()
100 // above, which chains a macro to previous defines, undefs, etc.
101 // However, in a pch, the whole macro history up to the end of the pch is
102 // stored, so ASTReader goes through this function instead.
103 // However, built-in macros are already registered in the Preprocessor
104 // ctor, and ASTWriter stops writing the macro chain at built-in macros,
105 // so in that case the chain from the pch needs to be spliced to the existing
109 MacroState &StoredMD = CurSubmoduleState->Macros[II];
111 if (auto *OldMD = StoredMD.getLatest()) {
112 // shouldIgnoreMacro() in ASTWriter also stops at macros from the
113 // predefines buffer in module builds. However, in module builds, modules
114 // are loaded completely before predefines are processed, so StoredMD
115 // will be nullptr for them when they're loaded. StoredMD should only be
116 // non-nullptr for builtins read from a pch file.
117 assert(OldMD->getMacroInfo()->isBuiltinMacro() &&
118 "only built-ins should have an entry here");
119 assert(!OldMD->getPrevious() && "builtin should only have a single entry");
120 ED->setPrevious(OldMD);
121 StoredMD.setLatest(MD);
126 // Setup the identifier as having associated macro history.
127 II->setHasMacroDefinition(true);
128 if (!MD->isDefined() && LeafModuleMacros.find(II) == LeafModuleMacros.end())
129 II->setHasMacroDefinition(false);
132 ModuleMacro *Preprocessor::addModuleMacro(Module *Mod, IdentifierInfo *II,
134 ArrayRef<ModuleMacro *> Overrides,
136 llvm::FoldingSetNodeID ID;
137 ModuleMacro::Profile(ID, Mod, II);
140 if (auto *MM = ModuleMacros.FindNodeOrInsertPos(ID, InsertPos)) {
145 auto *MM = ModuleMacro::create(*this, Mod, II, Macro, Overrides);
146 ModuleMacros.InsertNode(MM, InsertPos);
148 // Each overridden macro is now overridden by one more macro.
150 for (auto *O : Overrides) {
151 HidAny |= (O->NumOverriddenBy == 0);
152 ++O->NumOverriddenBy;
155 // If we were the first overrider for any macro, it's no longer a leaf.
156 auto &LeafMacros = LeafModuleMacros[II];
158 LeafMacros.erase(std::remove_if(LeafMacros.begin(), LeafMacros.end(),
159 [](ModuleMacro *MM) {
160 return MM->NumOverriddenBy != 0;
165 // The new macro is always a leaf macro.
166 LeafMacros.push_back(MM);
167 // The identifier now has defined macros (that may or may not be visible).
168 II->setHasMacroDefinition(true);
174 ModuleMacro *Preprocessor::getModuleMacro(Module *Mod,
175 const IdentifierInfo *II) {
176 llvm::FoldingSetNodeID ID;
177 ModuleMacro::Profile(ID, Mod, II);
180 return ModuleMacros.FindNodeOrInsertPos(ID, InsertPos);
183 void Preprocessor::updateModuleMacroInfo(const IdentifierInfo *II,
184 ModuleMacroInfo &Info) {
185 assert(Info.ActiveModuleMacrosGeneration !=
186 CurSubmoduleState->VisibleModules.getGeneration() &&
187 "don't need to update this macro name info");
188 Info.ActiveModuleMacrosGeneration =
189 CurSubmoduleState->VisibleModules.getGeneration();
191 auto Leaf = LeafModuleMacros.find(II);
192 if (Leaf == LeafModuleMacros.end()) {
193 // No imported macros at all: nothing to do.
197 Info.ActiveModuleMacros.clear();
199 // Every macro that's locally overridden is overridden by a visible macro.
200 llvm::DenseMap<ModuleMacro *, int> NumHiddenOverrides;
201 for (auto *O : Info.OverriddenMacros)
202 NumHiddenOverrides[O] = -1;
204 // Collect all macros that are not overridden by a visible macro.
205 llvm::SmallVector<ModuleMacro *, 16> Worklist;
206 for (auto *LeafMM : Leaf->second) {
207 assert(LeafMM->getNumOverridingMacros() == 0 && "leaf macro overridden");
208 if (NumHiddenOverrides.lookup(LeafMM) == 0)
209 Worklist.push_back(LeafMM);
211 while (!Worklist.empty()) {
212 auto *MM = Worklist.pop_back_val();
213 if (CurSubmoduleState->VisibleModules.isVisible(MM->getOwningModule())) {
214 // We only care about collecting definitions; undefinitions only act
215 // to override other definitions.
216 if (MM->getMacroInfo())
217 Info.ActiveModuleMacros.push_back(MM);
219 for (auto *O : MM->overrides())
220 if ((unsigned)++NumHiddenOverrides[O] == O->getNumOverridingMacros())
221 Worklist.push_back(O);
224 // Our reverse postorder walk found the macros in reverse order.
225 std::reverse(Info.ActiveModuleMacros.begin(), Info.ActiveModuleMacros.end());
227 // Determine whether the macro name is ambiguous.
228 MacroInfo *MI = nullptr;
229 bool IsSystemMacro = true;
230 bool IsAmbiguous = false;
231 if (auto *MD = Info.MD) {
232 while (MD && isa<VisibilityMacroDirective>(MD))
233 MD = MD->getPrevious();
234 if (auto *DMD = dyn_cast_or_null<DefMacroDirective>(MD)) {
236 IsSystemMacro &= SourceMgr.isInSystemHeader(DMD->getLocation());
239 for (auto *Active : Info.ActiveModuleMacros) {
240 auto *NewMI = Active->getMacroInfo();
242 // Before marking the macro as ambiguous, check if this is a case where
243 // both macros are in system headers. If so, we trust that the system
244 // did not get it wrong. This also handles cases where Clang's own
245 // headers have a different spelling of certain system macros:
246 // #define LONG_MAX __LONG_MAX__ (clang's limits.h)
247 // #define LONG_MAX 0x7fffffffffffffffL (system's limits.h)
249 // FIXME: Remove the defined-in-system-headers check. clang's limits.h
250 // overrides the system limits.h's macros, so there's no conflict here.
251 if (MI && NewMI != MI &&
252 !MI->isIdenticalTo(*NewMI, *this, /*Syntactically=*/true))
254 IsSystemMacro &= Active->getOwningModule()->IsSystem ||
255 SourceMgr.isInSystemHeader(NewMI->getDefinitionLoc());
258 Info.IsAmbiguous = IsAmbiguous && !IsSystemMacro;
261 void Preprocessor::dumpMacroInfo(const IdentifierInfo *II) {
262 ArrayRef<ModuleMacro*> Leaf;
263 auto LeafIt = LeafModuleMacros.find(II);
264 if (LeafIt != LeafModuleMacros.end())
265 Leaf = LeafIt->second;
266 const MacroState *State = nullptr;
267 auto Pos = CurSubmoduleState->Macros.find(II);
268 if (Pos != CurSubmoduleState->Macros.end())
269 State = &Pos->second;
271 llvm::errs() << "MacroState " << State << " " << II->getNameStart();
272 if (State && State->isAmbiguous(*this, II))
273 llvm::errs() << " ambiguous";
274 if (State && !State->getOverriddenMacros().empty()) {
275 llvm::errs() << " overrides";
276 for (auto *O : State->getOverriddenMacros())
277 llvm::errs() << " " << O->getOwningModule()->getFullModuleName();
279 llvm::errs() << "\n";
281 // Dump local macro directives.
282 for (auto *MD = State ? State->getLatest() : nullptr; MD;
283 MD = MD->getPrevious()) {
288 // Dump module macros.
289 llvm::DenseSet<ModuleMacro*> Active;
290 for (auto *MM : State ? State->getActiveModuleMacros(*this, II) : None)
292 llvm::DenseSet<ModuleMacro*> Visited;
293 llvm::SmallVector<ModuleMacro *, 16> Worklist(Leaf.begin(), Leaf.end());
294 while (!Worklist.empty()) {
295 auto *MM = Worklist.pop_back_val();
296 llvm::errs() << " ModuleMacro " << MM << " "
297 << MM->getOwningModule()->getFullModuleName();
298 if (!MM->getMacroInfo())
299 llvm::errs() << " undef";
301 if (Active.count(MM))
302 llvm::errs() << " active";
303 else if (!CurSubmoduleState->VisibleModules.isVisible(
304 MM->getOwningModule()))
305 llvm::errs() << " hidden";
306 else if (MM->getMacroInfo())
307 llvm::errs() << " overridden";
309 if (!MM->overrides().empty()) {
310 llvm::errs() << " overrides";
311 for (auto *O : MM->overrides()) {
312 llvm::errs() << " " << O->getOwningModule()->getFullModuleName();
313 if (Visited.insert(O).second)
314 Worklist.push_back(O);
317 llvm::errs() << "\n";
318 if (auto *MI = MM->getMacroInfo()) {
321 llvm::errs() << "\n";
326 /// RegisterBuiltinMacro - Register the specified identifier in the identifier
327 /// table and mark it as a builtin macro to be expanded.
328 static IdentifierInfo *RegisterBuiltinMacro(Preprocessor &PP, const char *Name){
329 // Get the identifier.
330 IdentifierInfo *Id = PP.getIdentifierInfo(Name);
332 // Mark it as being a macro that is builtin.
333 MacroInfo *MI = PP.AllocateMacroInfo(SourceLocation());
334 MI->setIsBuiltinMacro();
335 PP.appendDefMacroDirective(Id, MI);
339 /// RegisterBuiltinMacros - Register builtin macros, such as __LINE__ with the
340 /// identifier table.
341 void Preprocessor::RegisterBuiltinMacros() {
342 Ident__LINE__ = RegisterBuiltinMacro(*this, "__LINE__");
343 Ident__FILE__ = RegisterBuiltinMacro(*this, "__FILE__");
344 Ident__DATE__ = RegisterBuiltinMacro(*this, "__DATE__");
345 Ident__TIME__ = RegisterBuiltinMacro(*this, "__TIME__");
346 Ident__COUNTER__ = RegisterBuiltinMacro(*this, "__COUNTER__");
347 Ident_Pragma = RegisterBuiltinMacro(*this, "_Pragma");
349 // C++ Standing Document Extensions.
350 if (getLangOpts().CPlusPlus)
351 Ident__has_cpp_attribute =
352 RegisterBuiltinMacro(*this, "__has_cpp_attribute");
354 Ident__has_cpp_attribute = nullptr;
357 Ident__BASE_FILE__ = RegisterBuiltinMacro(*this, "__BASE_FILE__");
358 Ident__INCLUDE_LEVEL__ = RegisterBuiltinMacro(*this, "__INCLUDE_LEVEL__");
359 Ident__TIMESTAMP__ = RegisterBuiltinMacro(*this, "__TIMESTAMP__");
361 // Microsoft Extensions.
362 if (getLangOpts().MicrosoftExt) {
363 Ident__identifier = RegisterBuiltinMacro(*this, "__identifier");
364 Ident__pragma = RegisterBuiltinMacro(*this, "__pragma");
366 Ident__identifier = nullptr;
367 Ident__pragma = nullptr;
371 Ident__FILE_NAME__ = RegisterBuiltinMacro(*this, "__FILE_NAME__");
372 Ident__has_feature = RegisterBuiltinMacro(*this, "__has_feature");
373 Ident__has_extension = RegisterBuiltinMacro(*this, "__has_extension");
374 Ident__has_builtin = RegisterBuiltinMacro(*this, "__has_builtin");
375 Ident__has_attribute = RegisterBuiltinMacro(*this, "__has_attribute");
376 if (!getLangOpts().CPlusPlus)
377 Ident__has_c_attribute = RegisterBuiltinMacro(*this, "__has_c_attribute");
379 Ident__has_c_attribute = nullptr;
381 Ident__has_declspec = RegisterBuiltinMacro(*this, "__has_declspec_attribute");
382 Ident__has_include = RegisterBuiltinMacro(*this, "__has_include");
383 Ident__has_include_next = RegisterBuiltinMacro(*this, "__has_include_next");
384 Ident__has_warning = RegisterBuiltinMacro(*this, "__has_warning");
385 Ident__is_identifier = RegisterBuiltinMacro(*this, "__is_identifier");
386 Ident__is_target_arch = RegisterBuiltinMacro(*this, "__is_target_arch");
387 Ident__is_target_vendor = RegisterBuiltinMacro(*this, "__is_target_vendor");
388 Ident__is_target_os = RegisterBuiltinMacro(*this, "__is_target_os");
389 Ident__is_target_environment =
390 RegisterBuiltinMacro(*this, "__is_target_environment");
393 Ident__building_module = RegisterBuiltinMacro(*this, "__building_module");
394 if (!getLangOpts().CurrentModule.empty())
395 Ident__MODULE__ = RegisterBuiltinMacro(*this, "__MODULE__");
397 Ident__MODULE__ = nullptr;
400 /// isTrivialSingleTokenExpansion - Return true if MI, which has a single token
401 /// in its expansion, currently expands to that token literally.
402 static bool isTrivialSingleTokenExpansion(const MacroInfo *MI,
403 const IdentifierInfo *MacroIdent,
405 IdentifierInfo *II = MI->getReplacementToken(0).getIdentifierInfo();
407 // If the token isn't an identifier, it's always literally expanded.
408 if (!II) return true;
410 // If the information about this identifier is out of date, update it from
411 // the external source.
412 if (II->isOutOfDate())
413 PP.getExternalSource()->updateOutOfDateIdentifier(*II);
415 // If the identifier is a macro, and if that macro is enabled, it may be
416 // expanded so it's not a trivial expansion.
417 if (auto *ExpansionMI = PP.getMacroInfo(II))
418 if (ExpansionMI->isEnabled() &&
419 // Fast expanding "#define X X" is ok, because X would be disabled.
423 // If this is an object-like macro invocation, it is safe to trivially expand
425 if (MI->isObjectLike()) return true;
427 // If this is a function-like macro invocation, it's safe to trivially expand
428 // as long as the identifier is not a macro argument.
429 return std::find(MI->param_begin(), MI->param_end(), II) == MI->param_end();
432 /// isNextPPTokenLParen - Determine whether the next preprocessor token to be
433 /// lexed is a '('. If so, consume the token and return true, if not, this
434 /// method should have no observable side-effect on the lexed tokens.
435 bool Preprocessor::isNextPPTokenLParen() {
436 // Do some quick tests for rejection cases.
439 Val = CurLexer->isNextPPTokenLParen();
441 Val = CurTokenLexer->isNextTokenLParen();
444 // We have run off the end. If it's a source file we don't
445 // examine enclosing ones (C99 5.1.1.2p4). Otherwise walk up the
449 for (const IncludeStackInfo &Entry : llvm::reverse(IncludeMacroStack)) {
451 Val = Entry.TheLexer->isNextPPTokenLParen();
453 Val = Entry.TheTokenLexer->isNextTokenLParen();
458 // Ran off the end of a source file?
459 if (Entry.ThePPLexer)
464 // Okay, if we know that the token is a '(', lex it and return. Otherwise we
465 // have found something that isn't a '(' or we found the end of the
466 // translation unit. In either case, return false.
470 /// HandleMacroExpandedIdentifier - If an identifier token is read that is to be
471 /// expanded as a macro, handle it and return the next token as 'Identifier'.
472 bool Preprocessor::HandleMacroExpandedIdentifier(Token &Identifier,
473 const MacroDefinition &M) {
474 MacroInfo *MI = M.getMacroInfo();
476 // If this is a macro expansion in the "#if !defined(x)" line for the file,
477 // then the macro could expand to different things in other contexts, we need
478 // to disable the optimization in this case.
479 if (CurPPLexer) CurPPLexer->MIOpt.ExpandedMacro();
481 // If this is a builtin macro, like __LINE__ or _Pragma, handle it specially.
482 if (MI->isBuiltinMacro()) {
484 Callbacks->MacroExpands(Identifier, M, Identifier.getLocation(),
486 ExpandBuiltinMacro(Identifier);
490 /// Args - If this is a function-like macro expansion, this contains,
491 /// for each macro argument, the list of tokens that were provided to the
493 MacroArgs *Args = nullptr;
495 // Remember where the end of the expansion occurred. For an object-like
496 // macro, this is the identifier. For a function-like macro, this is the ')'.
497 SourceLocation ExpansionEnd = Identifier.getLocation();
499 // If this is a function-like macro, read the arguments.
500 if (MI->isFunctionLike()) {
501 // Remember that we are now parsing the arguments to a macro invocation.
502 // Preprocessor directives used inside macro arguments are not portable, and
503 // this enables the warning.
505 ArgMacro = &Identifier;
507 Args = ReadMacroCallArgumentList(Identifier, MI, ExpansionEnd);
509 // Finished parsing args.
513 // If there was an error parsing the arguments, bail out.
514 if (!Args) return true;
516 ++NumFnMacroExpanded;
521 // Notice that this macro has been used.
524 // Remember where the token is expanded.
525 SourceLocation ExpandLoc = Identifier.getLocation();
526 SourceRange ExpansionRange(ExpandLoc, ExpansionEnd);
530 // We can have macro expansion inside a conditional directive while
531 // reading the function macro arguments. To ensure, in that case, that
532 // MacroExpands callbacks still happen in source order, queue this
533 // callback to have it happen after the function macro callback.
534 DelayedMacroExpandsCallbacks.push_back(
535 MacroExpandsInfo(Identifier, M, ExpansionRange));
537 Callbacks->MacroExpands(Identifier, M, ExpansionRange, Args);
538 if (!DelayedMacroExpandsCallbacks.empty()) {
539 for (const MacroExpandsInfo &Info : DelayedMacroExpandsCallbacks) {
540 // FIXME: We lose macro args info with delayed callback.
541 Callbacks->MacroExpands(Info.Tok, Info.MD, Info.Range,
544 DelayedMacroExpandsCallbacks.clear();
549 // If the macro definition is ambiguous, complain.
550 if (M.isAmbiguous()) {
551 Diag(Identifier, diag::warn_pp_ambiguous_macro)
552 << Identifier.getIdentifierInfo();
553 Diag(MI->getDefinitionLoc(), diag::note_pp_ambiguous_macro_chosen)
554 << Identifier.getIdentifierInfo();
555 M.forAllDefinitions([&](const MacroInfo *OtherMI) {
557 Diag(OtherMI->getDefinitionLoc(), diag::note_pp_ambiguous_macro_other)
558 << Identifier.getIdentifierInfo();
562 // If we started lexing a macro, enter the macro expansion body.
564 // If this macro expands to no tokens, don't bother to push it onto the
565 // expansion stack, only to take it right back off.
566 if (MI->getNumTokens() == 0) {
567 // No need for arg info.
568 if (Args) Args->destroy(*this);
570 // Propagate whitespace info as if we had pushed, then popped,
572 Identifier.setFlag(Token::LeadingEmptyMacro);
573 PropagateLineStartLeadingSpaceInfo(Identifier);
574 ++NumFastMacroExpanded;
576 } else if (MI->getNumTokens() == 1 &&
577 isTrivialSingleTokenExpansion(MI, Identifier.getIdentifierInfo(),
579 // Otherwise, if this macro expands into a single trivially-expanded
580 // token: expand it now. This handles common cases like
583 // No need for arg info.
584 if (Args) Args->destroy(*this);
586 // Propagate the isAtStartOfLine/hasLeadingSpace markers of the macro
587 // identifier to the expanded token.
588 bool isAtStartOfLine = Identifier.isAtStartOfLine();
589 bool hasLeadingSpace = Identifier.hasLeadingSpace();
591 // Replace the result token.
592 Identifier = MI->getReplacementToken(0);
594 // Restore the StartOfLine/LeadingSpace markers.
595 Identifier.setFlagValue(Token::StartOfLine , isAtStartOfLine);
596 Identifier.setFlagValue(Token::LeadingSpace, hasLeadingSpace);
598 // Update the tokens location to include both its expansion and physical
601 SourceMgr.createExpansionLoc(Identifier.getLocation(), ExpandLoc,
602 ExpansionEnd,Identifier.getLength());
603 Identifier.setLocation(Loc);
605 // If this is a disabled macro or #define X X, we must mark the result as
607 if (IdentifierInfo *NewII = Identifier.getIdentifierInfo()) {
608 if (MacroInfo *NewMI = getMacroInfo(NewII))
609 if (!NewMI->isEnabled() || NewMI == MI) {
610 Identifier.setFlag(Token::DisableExpand);
611 // Don't warn for "#define X X" like "#define bool bool" from
613 if (NewMI != MI || MI->isFunctionLike())
614 Diag(Identifier, diag::pp_disabled_macro_expansion);
618 // Since this is not an identifier token, it can't be macro expanded, so
620 ++NumFastMacroExpanded;
624 // Start expanding the macro.
625 EnterMacro(Identifier, ExpansionEnd, MI, Args);
634 /// CheckMatchedBrackets - Returns true if the braces and parentheses in the
635 /// token vector are properly nested.
636 static bool CheckMatchedBrackets(const SmallVectorImpl<Token> &Tokens) {
637 SmallVector<Bracket, 8> Brackets;
638 for (SmallVectorImpl<Token>::const_iterator I = Tokens.begin(),
641 if (I->is(tok::l_paren)) {
642 Brackets.push_back(Paren);
643 } else if (I->is(tok::r_paren)) {
644 if (Brackets.empty() || Brackets.back() == Brace)
647 } else if (I->is(tok::l_brace)) {
648 Brackets.push_back(Brace);
649 } else if (I->is(tok::r_brace)) {
650 if (Brackets.empty() || Brackets.back() == Paren)
655 return Brackets.empty();
658 /// GenerateNewArgTokens - Returns true if OldTokens can be converted to a new
659 /// vector of tokens in NewTokens. The new number of arguments will be placed
660 /// in NumArgs and the ranges which need to surrounded in parentheses will be
662 /// Returns false if the token stream cannot be changed. If this is because
663 /// of an initializer list starting a macro argument, the range of those
664 /// initializer lists will be place in InitLists.
665 static bool GenerateNewArgTokens(Preprocessor &PP,
666 SmallVectorImpl<Token> &OldTokens,
667 SmallVectorImpl<Token> &NewTokens,
669 SmallVectorImpl<SourceRange> &ParenHints,
670 SmallVectorImpl<SourceRange> &InitLists) {
671 if (!CheckMatchedBrackets(OldTokens))
674 // Once it is known that the brackets are matched, only a simple count of the
678 // First token of a new macro argument.
679 SmallVectorImpl<Token>::iterator ArgStartIterator = OldTokens.begin();
681 // First closing brace in a new macro argument. Used to generate
682 // SourceRanges for InitLists.
683 SmallVectorImpl<Token>::iterator ClosingBrace = OldTokens.end();
686 // Set to true when a macro separator token is found inside a braced list.
687 // If true, the fixed argument spans multiple old arguments and ParenHints
689 bool FoundSeparatorToken = false;
690 for (SmallVectorImpl<Token>::iterator I = OldTokens.begin(),
693 if (I->is(tok::l_brace)) {
695 } else if (I->is(tok::r_brace)) {
697 if (Braces == 0 && ClosingBrace == E && FoundSeparatorToken)
699 } else if (I->is(tok::eof)) {
700 // EOF token is used to separate macro arguments
702 // Assume comma separator is actually braced list separator and change
703 // it back to a comma.
704 FoundSeparatorToken = true;
705 I->setKind(tok::comma);
707 } else { // Braces == 0
708 // Separator token still separates arguments.
711 // If the argument starts with a brace, it can't be fixed with
712 // parentheses. A different diagnostic will be given.
713 if (FoundSeparatorToken && ArgStartIterator->is(tok::l_brace)) {
715 SourceRange(ArgStartIterator->getLocation(),
716 PP.getLocForEndOfToken(ClosingBrace->getLocation())));
721 if (FoundSeparatorToken) {
722 TempToken.startToken();
723 TempToken.setKind(tok::l_paren);
724 TempToken.setLocation(ArgStartIterator->getLocation());
725 TempToken.setLength(0);
726 NewTokens.push_back(TempToken);
729 // Copy over argument tokens
730 NewTokens.insert(NewTokens.end(), ArgStartIterator, I);
732 // Add right paren and store the paren locations in ParenHints
733 if (FoundSeparatorToken) {
734 SourceLocation Loc = PP.getLocForEndOfToken((I - 1)->getLocation());
735 TempToken.startToken();
736 TempToken.setKind(tok::r_paren);
737 TempToken.setLocation(Loc);
738 TempToken.setLength(0);
739 NewTokens.push_back(TempToken);
740 ParenHints.push_back(SourceRange(ArgStartIterator->getLocation(),
744 // Copy separator token
745 NewTokens.push_back(*I);
748 ArgStartIterator = I + 1;
749 FoundSeparatorToken = false;
754 return !ParenHints.empty() && InitLists.empty();
757 /// ReadFunctionLikeMacroArgs - After reading "MACRO" and knowing that the next
758 /// token is the '(' of the macro, this method is invoked to read all of the
759 /// actual arguments specified for the macro invocation. This returns null on
761 MacroArgs *Preprocessor::ReadMacroCallArgumentList(Token &MacroName,
763 SourceLocation &MacroEnd) {
764 // The number of fixed arguments to parse.
765 unsigned NumFixedArgsLeft = MI->getNumParams();
766 bool isVariadic = MI->isVariadic();
768 // Outer loop, while there are more arguments, keep reading them.
771 // Read arguments as unexpanded tokens. This avoids issues, e.g., where
772 // an argument value in a macro could expand to ',' or '(' or ')'.
773 LexUnexpandedToken(Tok);
774 assert(Tok.is(tok::l_paren) && "Error computing l-paren-ness?");
776 // ArgTokens - Build up a list of tokens that make up each argument. Each
777 // argument is separated by an EOF token. Use a SmallVector so we can avoid
778 // heap allocations in the common case.
779 SmallVector<Token, 64> ArgTokens;
780 bool ContainsCodeCompletionTok = false;
781 bool FoundElidedComma = false;
783 SourceLocation TooManyArgsLoc;
785 unsigned NumActuals = 0;
786 while (Tok.isNot(tok::r_paren)) {
787 if (ContainsCodeCompletionTok && Tok.isOneOf(tok::eof, tok::eod))
790 assert(Tok.isOneOf(tok::l_paren, tok::comma) &&
791 "only expect argument separators here");
793 size_t ArgTokenStart = ArgTokens.size();
794 SourceLocation ArgStartLoc = Tok.getLocation();
796 // C99 6.10.3p11: Keep track of the number of l_parens we have seen. Note
797 // that we already consumed the first one.
798 unsigned NumParens = 0;
801 // Read arguments as unexpanded tokens. This avoids issues, e.g., where
802 // an argument value in a macro could expand to ',' or '(' or ')'.
803 LexUnexpandedToken(Tok);
805 if (Tok.isOneOf(tok::eof, tok::eod)) { // "#if f(<eof>" & "#if f(\n"
806 if (!ContainsCodeCompletionTok) {
807 Diag(MacroName, diag::err_unterm_macro_invoc);
808 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
809 << MacroName.getIdentifierInfo();
810 // Do not lose the EOF/EOD. Return it to the client.
814 // Do not lose the EOF/EOD.
815 auto Toks = std::make_unique<Token[]>(1);
817 EnterTokenStream(std::move(Toks), 1, true, /*IsReinject*/ false);
819 } else if (Tok.is(tok::r_paren)) {
820 // If we found the ) token, the macro arg list is done.
821 if (NumParens-- == 0) {
822 MacroEnd = Tok.getLocation();
823 if (!ArgTokens.empty() &&
824 ArgTokens.back().commaAfterElided()) {
825 FoundElidedComma = true;
829 } else if (Tok.is(tok::l_paren)) {
831 } else if (Tok.is(tok::comma)) {
832 // In Microsoft-compatibility mode, single commas from nested macro
833 // expansions should not be considered as argument separators. We test
834 // for this with the IgnoredComma token flag.
835 if (Tok.getFlags() & Token::IgnoredComma) {
836 // However, in MSVC's preprocessor, subsequent expansions do treat
837 // these commas as argument separators. This leads to a common
838 // workaround used in macros that need to work in both MSVC and
839 // compliant preprocessors. Therefore, the IgnoredComma flag can only
840 // apply once to any given token.
841 Tok.clearFlag(Token::IgnoredComma);
842 } else if (NumParens == 0) {
843 // Comma ends this argument if there are more fixed arguments
844 // expected. However, if this is a variadic macro, and this is part of
845 // the variadic part, then the comma is just an argument token.
848 if (NumFixedArgsLeft > 1)
851 } else if (Tok.is(tok::comment) && !KeepMacroComments) {
852 // If this is a comment token in the argument list and we're just in
853 // -C mode (not -CC mode), discard the comment.
855 } else if (!Tok.isAnnotation() && Tok.getIdentifierInfo() != nullptr) {
856 // Reading macro arguments can cause macros that we are currently
857 // expanding from to be popped off the expansion stack. Doing so causes
858 // them to be reenabled for expansion. Here we record whether any
859 // identifiers we lex as macro arguments correspond to disabled macros.
860 // If so, we mark the token as noexpand. This is a subtle aspect of
862 if (MacroInfo *MI = getMacroInfo(Tok.getIdentifierInfo()))
863 if (!MI->isEnabled())
864 Tok.setFlag(Token::DisableExpand);
865 } else if (Tok.is(tok::code_completion)) {
866 ContainsCodeCompletionTok = true;
868 CodeComplete->CodeCompleteMacroArgument(MacroName.getIdentifierInfo(),
870 // Don't mark that we reached the code-completion point because the
871 // parser is going to handle the token and there will be another
872 // code-completion callback.
875 ArgTokens.push_back(Tok);
878 // If this was an empty argument list foo(), don't add this as an empty
880 if (ArgTokens.empty() && Tok.getKind() == tok::r_paren)
883 // If this is not a variadic macro, and too many args were specified, emit
885 if (!isVariadic && NumFixedArgsLeft == 0 && TooManyArgsLoc.isInvalid()) {
886 if (ArgTokens.size() != ArgTokenStart)
887 TooManyArgsLoc = ArgTokens[ArgTokenStart].getLocation();
889 TooManyArgsLoc = ArgStartLoc;
892 // Empty arguments are standard in C99 and C++0x, and are supported as an
893 // extension in other modes.
894 if (ArgTokens.size() == ArgTokenStart && !getLangOpts().C99)
895 Diag(Tok, getLangOpts().CPlusPlus11
896 ? diag::warn_cxx98_compat_empty_fnmacro_arg
897 : diag::ext_empty_fnmacro_arg);
899 // Add a marker EOF token to the end of the token list for this argument.
902 EOFTok.setKind(tok::eof);
903 EOFTok.setLocation(Tok.getLocation());
905 ArgTokens.push_back(EOFTok);
907 if (!ContainsCodeCompletionTok && NumFixedArgsLeft != 0)
911 // Okay, we either found the r_paren. Check to see if we parsed too few
913 unsigned MinArgsExpected = MI->getNumParams();
915 // If this is not a variadic macro, and too many args were specified, emit
917 if (!isVariadic && NumActuals > MinArgsExpected &&
918 !ContainsCodeCompletionTok) {
919 // Emit the diagnostic at the macro name in case there is a missing ).
920 // Emitting it at the , could be far away from the macro name.
921 Diag(TooManyArgsLoc, diag::err_too_many_args_in_macro_invoc);
922 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
923 << MacroName.getIdentifierInfo();
925 // Commas from braced initializer lists will be treated as argument
926 // separators inside macros. Attempt to correct for this with parentheses.
927 // TODO: See if this can be generalized to angle brackets for templates
928 // inside macro arguments.
930 SmallVector<Token, 4> FixedArgTokens;
931 unsigned FixedNumArgs = 0;
932 SmallVector<SourceRange, 4> ParenHints, InitLists;
933 if (!GenerateNewArgTokens(*this, ArgTokens, FixedArgTokens, FixedNumArgs,
934 ParenHints, InitLists)) {
935 if (!InitLists.empty()) {
936 DiagnosticBuilder DB =
938 diag::note_init_list_at_beginning_of_macro_argument);
939 for (SourceRange Range : InitLists)
944 if (FixedNumArgs != MinArgsExpected)
947 DiagnosticBuilder DB = Diag(MacroName, diag::note_suggest_parens_for_macro);
948 for (SourceRange ParenLocation : ParenHints) {
949 DB << FixItHint::CreateInsertion(ParenLocation.getBegin(), "(");
950 DB << FixItHint::CreateInsertion(ParenLocation.getEnd(), ")");
952 ArgTokens.swap(FixedArgTokens);
953 NumActuals = FixedNumArgs;
956 // See MacroArgs instance var for description of this.
957 bool isVarargsElided = false;
959 if (ContainsCodeCompletionTok) {
960 // Recover from not-fully-formed macro invocation during code-completion.
963 EOFTok.setKind(tok::eof);
964 EOFTok.setLocation(Tok.getLocation());
966 for (; NumActuals < MinArgsExpected; ++NumActuals)
967 ArgTokens.push_back(EOFTok);
970 if (NumActuals < MinArgsExpected) {
971 // There are several cases where too few arguments is ok, handle them now.
972 if (NumActuals == 0 && MinArgsExpected == 1) {
973 // #define A(X) or #define A(...) ---> A()
975 // If there is exactly one argument, and that argument is missing,
976 // then we have an empty "()" argument empty list. This is fine, even if
977 // the macro expects one argument (the argument is just empty).
978 isVarargsElided = MI->isVariadic();
979 } else if ((FoundElidedComma || MI->isVariadic()) &&
980 (NumActuals+1 == MinArgsExpected || // A(x, ...) -> A(X)
981 (NumActuals == 0 && MinArgsExpected == 2))) {// A(x,...) -> A()
982 // Varargs where the named vararg parameter is missing: OK as extension.
986 // If the macro contains the comma pasting extension, the diagnostic
987 // is suppressed; we know we'll get another diagnostic later.
988 if (!MI->hasCommaPasting()) {
989 Diag(Tok, diag::ext_missing_varargs_arg);
990 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
991 << MacroName.getIdentifierInfo();
994 // Remember this occurred, allowing us to elide the comma when used for
996 // #define A(x, foo...) blah(a, ## foo)
997 // #define B(x, ...) blah(a, ## __VA_ARGS__)
998 // #define C(...) blah(a, ## __VA_ARGS__)
1000 isVarargsElided = true;
1001 } else if (!ContainsCodeCompletionTok) {
1002 // Otherwise, emit the error.
1003 Diag(Tok, diag::err_too_few_args_in_macro_invoc);
1004 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
1005 << MacroName.getIdentifierInfo();
1009 // Add a marker EOF token to the end of the token list for this argument.
1010 SourceLocation EndLoc = Tok.getLocation();
1012 Tok.setKind(tok::eof);
1013 Tok.setLocation(EndLoc);
1015 ArgTokens.push_back(Tok);
1017 // If we expect two arguments, add both as empty.
1018 if (NumActuals == 0 && MinArgsExpected == 2)
1019 ArgTokens.push_back(Tok);
1021 } else if (NumActuals > MinArgsExpected && !MI->isVariadic() &&
1022 !ContainsCodeCompletionTok) {
1023 // Emit the diagnostic at the macro name in case there is a missing ).
1024 // Emitting it at the , could be far away from the macro name.
1025 Diag(MacroName, diag::err_too_many_args_in_macro_invoc);
1026 Diag(MI->getDefinitionLoc(), diag::note_macro_here)
1027 << MacroName.getIdentifierInfo();
1031 return MacroArgs::create(MI, ArgTokens, isVarargsElided, *this);
1034 /// Keeps macro expanded tokens for TokenLexers.
1036 /// Works like a stack; a TokenLexer adds the macro expanded tokens that is
1037 /// going to lex in the cache and when it finishes the tokens are removed
1038 /// from the end of the cache.
1039 Token *Preprocessor::cacheMacroExpandedTokens(TokenLexer *tokLexer,
1040 ArrayRef<Token> tokens) {
1045 size_t newIndex = MacroExpandedTokens.size();
1046 bool cacheNeedsToGrow = tokens.size() >
1047 MacroExpandedTokens.capacity()-MacroExpandedTokens.size();
1048 MacroExpandedTokens.append(tokens.begin(), tokens.end());
1050 if (cacheNeedsToGrow) {
1051 // Go through all the TokenLexers whose 'Tokens' pointer points in the
1052 // buffer and update the pointers to the (potential) new buffer array.
1053 for (const auto &Lexer : MacroExpandingLexersStack) {
1054 TokenLexer *prevLexer;
1056 std::tie(prevLexer, tokIndex) = Lexer;
1057 prevLexer->Tokens = MacroExpandedTokens.data() + tokIndex;
1061 MacroExpandingLexersStack.push_back(std::make_pair(tokLexer, newIndex));
1062 return MacroExpandedTokens.data() + newIndex;
1065 void Preprocessor::removeCachedMacroExpandedTokensOfLastLexer() {
1066 assert(!MacroExpandingLexersStack.empty());
1067 size_t tokIndex = MacroExpandingLexersStack.back().second;
1068 assert(tokIndex < MacroExpandedTokens.size());
1069 // Pop the cached macro expanded tokens from the end.
1070 MacroExpandedTokens.resize(tokIndex);
1071 MacroExpandingLexersStack.pop_back();
1074 /// ComputeDATE_TIME - Compute the current time, enter it into the specified
1075 /// scratch buffer, then return DATELoc/TIMELoc locations with the position of
1076 /// the identifier tokens inserted.
1077 static void ComputeDATE_TIME(SourceLocation &DATELoc, SourceLocation &TIMELoc,
1079 time_t TT = time(nullptr);
1080 struct tm *TM = localtime(&TT);
1082 static const char * const Months[] = {
1083 "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
1087 SmallString<32> TmpBuffer;
1088 llvm::raw_svector_ostream TmpStream(TmpBuffer);
1089 TmpStream << llvm::format("\"%s %2d %4d\"", Months[TM->tm_mon],
1090 TM->tm_mday, TM->tm_year + 1900);
1092 TmpTok.startToken();
1093 PP.CreateString(TmpStream.str(), TmpTok);
1094 DATELoc = TmpTok.getLocation();
1098 SmallString<32> TmpBuffer;
1099 llvm::raw_svector_ostream TmpStream(TmpBuffer);
1100 TmpStream << llvm::format("\"%02d:%02d:%02d\"",
1101 TM->tm_hour, TM->tm_min, TM->tm_sec);
1103 TmpTok.startToken();
1104 PP.CreateString(TmpStream.str(), TmpTok);
1105 TIMELoc = TmpTok.getLocation();
1109 /// HasFeature - Return true if we recognize and implement the feature
1110 /// specified by the identifier as a standard language feature.
1111 static bool HasFeature(const Preprocessor &PP, StringRef Feature) {
1112 const LangOptions &LangOpts = PP.getLangOpts();
1114 // Normalize the feature name, __foo__ becomes foo.
1115 if (Feature.startswith("__") && Feature.endswith("__") && Feature.size() >= 4)
1116 Feature = Feature.substr(2, Feature.size() - 4);
1118 #define FEATURE(Name, Predicate) .Case(#Name, Predicate)
1119 return llvm::StringSwitch<bool>(Feature)
1120 #include "clang/Basic/Features.def"
1125 /// HasExtension - Return true if we recognize and implement the feature
1126 /// specified by the identifier, either as an extension or a standard language
1128 static bool HasExtension(const Preprocessor &PP, StringRef Extension) {
1129 if (HasFeature(PP, Extension))
1132 // If the use of an extension results in an error diagnostic, extensions are
1133 // effectively unavailable, so just return false here.
1134 if (PP.getDiagnostics().getExtensionHandlingBehavior() >=
1135 diag::Severity::Error)
1138 const LangOptions &LangOpts = PP.getLangOpts();
1140 // Normalize the extension name, __foo__ becomes foo.
1141 if (Extension.startswith("__") && Extension.endswith("__") &&
1142 Extension.size() >= 4)
1143 Extension = Extension.substr(2, Extension.size() - 4);
1145 // Because we inherit the feature list from HasFeature, this string switch
1146 // must be less restrictive than HasFeature's.
1147 #define EXTENSION(Name, Predicate) .Case(#Name, Predicate)
1148 return llvm::StringSwitch<bool>(Extension)
1149 #include "clang/Basic/Features.def"
1154 /// EvaluateHasIncludeCommon - Process a '__has_include("path")'
1155 /// or '__has_include_next("path")' expression.
1156 /// Returns true if successful.
1157 static bool EvaluateHasIncludeCommon(Token &Tok,
1158 IdentifierInfo *II, Preprocessor &PP,
1159 const DirectoryLookup *LookupFrom,
1160 const FileEntry *LookupFromFile) {
1161 // Save the location of the current token. If a '(' is later found, use
1162 // that location. If not, use the end of this location instead.
1163 SourceLocation LParenLoc = Tok.getLocation();
1165 // These expressions are only allowed within a preprocessor directive.
1166 if (!PP.isParsingIfOrElifDirective()) {
1167 PP.Diag(LParenLoc, diag::err_pp_directive_required) << II;
1168 // Return a valid identifier token.
1169 assert(Tok.is(tok::identifier));
1170 Tok.setIdentifierInfo(II);
1174 // Get '('. If we don't have a '(', try to form a header-name token.
1176 if (PP.LexHeaderName(Tok))
1178 } while (Tok.getKind() == tok::comment);
1180 // Ensure we have a '('.
1181 if (Tok.isNot(tok::l_paren)) {
1182 // No '(', use end of last token.
1183 LParenLoc = PP.getLocForEndOfToken(LParenLoc);
1184 PP.Diag(LParenLoc, diag::err_pp_expected_after) << II << tok::l_paren;
1185 // If the next token looks like a filename or the start of one,
1186 // assume it is and process it as such.
1187 if (Tok.isNot(tok::header_name))
1190 // Save '(' location for possible missing ')' message.
1191 LParenLoc = Tok.getLocation();
1192 if (PP.LexHeaderName(Tok))
1196 if (Tok.isNot(tok::header_name)) {
1197 PP.Diag(Tok.getLocation(), diag::err_pp_expects_filename);
1201 // Reserve a buffer to get the spelling.
1202 SmallString<128> FilenameBuffer;
1203 bool Invalid = false;
1204 StringRef Filename = PP.getSpelling(Tok, FilenameBuffer, &Invalid);
1208 SourceLocation FilenameLoc = Tok.getLocation();
1211 PP.LexNonComment(Tok);
1213 // Ensure we have a trailing ).
1214 if (Tok.isNot(tok::r_paren)) {
1215 PP.Diag(PP.getLocForEndOfToken(FilenameLoc), diag::err_pp_expected_after)
1216 << II << tok::r_paren;
1217 PP.Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1221 bool isAngled = PP.GetIncludeFilenameSpelling(Tok.getLocation(), Filename);
1222 // If GetIncludeFilenameSpelling set the start ptr to null, there was an
1224 if (Filename.empty())
1227 // Search include directories.
1228 const DirectoryLookup *CurDir;
1229 Optional<FileEntryRef> File =
1230 PP.LookupFile(FilenameLoc, Filename, isAngled, LookupFrom, LookupFromFile,
1231 CurDir, nullptr, nullptr, nullptr, nullptr, nullptr);
1233 if (PPCallbacks *Callbacks = PP.getPPCallbacks()) {
1234 SrcMgr::CharacteristicKind FileType = SrcMgr::C_User;
1237 PP.getHeaderSearchInfo().getFileDirFlavor(&File->getFileEntry());
1238 Callbacks->HasInclude(FilenameLoc, Filename, isAngled, File, FileType);
1241 // Get the result value. A result of true means the file exists.
1242 return File.hasValue();
1245 /// EvaluateHasInclude - Process a '__has_include("path")' expression.
1246 /// Returns true if successful.
1247 static bool EvaluateHasInclude(Token &Tok, IdentifierInfo *II,
1249 return EvaluateHasIncludeCommon(Tok, II, PP, nullptr, nullptr);
1252 /// EvaluateHasIncludeNext - Process '__has_include_next("path")' expression.
1253 /// Returns true if successful.
1254 static bool EvaluateHasIncludeNext(Token &Tok,
1255 IdentifierInfo *II, Preprocessor &PP) {
1256 // __has_include_next is like __has_include, except that we start
1257 // searching after the current found directory. If we can't do this,
1258 // issue a diagnostic.
1259 // FIXME: Factor out duplication with
1260 // Preprocessor::HandleIncludeNextDirective.
1261 const DirectoryLookup *Lookup = PP.GetCurDirLookup();
1262 const FileEntry *LookupFromFile = nullptr;
1263 if (PP.isInPrimaryFile() && PP.getLangOpts().IsHeaderFile) {
1264 // If the main file is a header, then it's either for PCH/AST generation,
1265 // or libclang opened it. Either way, handle it as a normal include below
1266 // and do not complain about __has_include_next.
1267 } else if (PP.isInPrimaryFile()) {
1269 PP.Diag(Tok, diag::pp_include_next_in_primary);
1270 } else if (PP.getCurrentLexerSubmodule()) {
1271 // Start looking up in the directory *after* the one in which the current
1272 // file would be found, if any.
1273 assert(PP.getCurrentLexer() && "#include_next directive in macro?");
1274 LookupFromFile = PP.getCurrentLexer()->getFileEntry();
1276 } else if (!Lookup) {
1277 PP.Diag(Tok, diag::pp_include_next_absolute_path);
1279 // Start looking up in the next directory.
1283 return EvaluateHasIncludeCommon(Tok, II, PP, Lookup, LookupFromFile);
1286 /// Process single-argument builtin feature-like macros that return
1288 static void EvaluateFeatureLikeBuiltinMacro(llvm::raw_svector_ostream& OS,
1289 Token &Tok, IdentifierInfo *II,
1293 bool &HasLexedNextTok)> Op) {
1294 // Parse the initial '('.
1295 PP.LexUnexpandedToken(Tok);
1296 if (Tok.isNot(tok::l_paren)) {
1297 PP.Diag(Tok.getLocation(), diag::err_pp_expected_after) << II
1300 // Provide a dummy '0' value on output stream to elide further errors.
1301 if (!Tok.isOneOf(tok::eof, tok::eod)) {
1303 Tok.setKind(tok::numeric_constant);
1308 unsigned ParenDepth = 1;
1309 SourceLocation LParenLoc = Tok.getLocation();
1310 llvm::Optional<int> Result;
1313 bool SuppressDiagnostic = false;
1315 // Parse next token.
1316 PP.LexUnexpandedToken(Tok);
1319 switch (Tok.getKind()) {
1322 // Don't provide even a dummy value if the eod or eof marker is
1323 // reached. Simply provide a diagnostic.
1324 PP.Diag(Tok.getLocation(), diag::err_unterm_macro_invoc);
1328 if (!SuppressDiagnostic) {
1329 PP.Diag(Tok.getLocation(), diag::err_too_many_args_in_macro_invoc);
1330 SuppressDiagnostic = true;
1336 if (Result.hasValue())
1338 if (!SuppressDiagnostic) {
1339 PP.Diag(Tok.getLocation(), diag::err_pp_nested_paren) << II;
1340 SuppressDiagnostic = true;
1345 if (--ParenDepth > 0)
1348 // The last ')' has been reached; return the value if one found or
1349 // a diagnostic and a dummy value.
1350 if (Result.hasValue()) {
1351 OS << Result.getValue();
1352 // For strict conformance to __has_cpp_attribute rules, use 'L'
1353 // suffix for dated literals.
1354 if (Result.getValue() > 1)
1358 if (!SuppressDiagnostic)
1359 PP.Diag(Tok.getLocation(), diag::err_too_few_args_in_macro_invoc);
1361 Tok.setKind(tok::numeric_constant);
1365 // Parse the macro argument, if one not found so far.
1366 if (Result.hasValue())
1369 bool HasLexedNextToken = false;
1370 Result = Op(Tok, HasLexedNextToken);
1372 if (HasLexedNextToken)
1378 // Diagnose missing ')'.
1379 if (!SuppressDiagnostic) {
1380 if (auto Diag = PP.Diag(Tok.getLocation(), diag::err_pp_expected_after)) {
1381 if (IdentifierInfo *LastII = ResultTok.getIdentifierInfo())
1384 Diag << ResultTok.getKind();
1385 Diag << tok::r_paren << ResultTok.getLocation();
1387 PP.Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1388 SuppressDiagnostic = true;
1393 /// Helper function to return the IdentifierInfo structure of a Token
1394 /// or generate a diagnostic if none available.
1395 static IdentifierInfo *ExpectFeatureIdentifierInfo(Token &Tok,
1399 if (!Tok.isAnnotation() && (II = Tok.getIdentifierInfo()))
1402 PP.Diag(Tok.getLocation(), DiagID);
1406 /// Implements the __is_target_arch builtin macro.
1407 static bool isTargetArch(const TargetInfo &TI, const IdentifierInfo *II) {
1408 std::string ArchName = II->getName().lower() + "--";
1409 llvm::Triple Arch(ArchName);
1410 const llvm::Triple &TT = TI.getTriple();
1412 // arm matches thumb or thumbv7. armv7 matches thumbv7.
1413 if ((Arch.getSubArch() == llvm::Triple::NoSubArch ||
1414 Arch.getSubArch() == TT.getSubArch()) &&
1415 ((TT.getArch() == llvm::Triple::thumb &&
1416 Arch.getArch() == llvm::Triple::arm) ||
1417 (TT.getArch() == llvm::Triple::thumbeb &&
1418 Arch.getArch() == llvm::Triple::armeb)))
1421 // Check the parsed arch when it has no sub arch to allow Clang to
1422 // match thumb to thumbv7 but to prohibit matching thumbv6 to thumbv7.
1423 return (Arch.getSubArch() == llvm::Triple::NoSubArch ||
1424 Arch.getSubArch() == TT.getSubArch()) &&
1425 Arch.getArch() == TT.getArch();
1428 /// Implements the __is_target_vendor builtin macro.
1429 static bool isTargetVendor(const TargetInfo &TI, const IdentifierInfo *II) {
1430 StringRef VendorName = TI.getTriple().getVendorName();
1431 if (VendorName.empty())
1432 VendorName = "unknown";
1433 return VendorName.equals_insensitive(II->getName());
1436 /// Implements the __is_target_os builtin macro.
1437 static bool isTargetOS(const TargetInfo &TI, const IdentifierInfo *II) {
1438 std::string OSName =
1439 (llvm::Twine("unknown-unknown-") + II->getName().lower()).str();
1440 llvm::Triple OS(OSName);
1441 if (OS.getOS() == llvm::Triple::Darwin) {
1442 // Darwin matches macos, ios, etc.
1443 return TI.getTriple().isOSDarwin();
1445 return TI.getTriple().getOS() == OS.getOS();
1448 /// Implements the __is_target_environment builtin macro.
1449 static bool isTargetEnvironment(const TargetInfo &TI,
1450 const IdentifierInfo *II) {
1451 std::string EnvName = (llvm::Twine("---") + II->getName().lower()).str();
1452 llvm::Triple Env(EnvName);
1453 return TI.getTriple().getEnvironment() == Env.getEnvironment();
1456 /// ExpandBuiltinMacro - If an identifier token is read that is to be expanded
1457 /// as a builtin macro, handle it and return the next token as 'Tok'.
1458 void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
1459 // Figure out which token this is.
1460 IdentifierInfo *II = Tok.getIdentifierInfo();
1461 assert(II && "Can't be a macro without id info!");
1463 // If this is an _Pragma or Microsoft __pragma directive, expand it,
1464 // invoke the pragma handler, then lex the token after it.
1465 if (II == Ident_Pragma)
1466 return Handle_Pragma(Tok);
1467 else if (II == Ident__pragma) // in non-MS mode this is null
1468 return HandleMicrosoft__pragma(Tok);
1470 ++NumBuiltinMacroExpanded;
1472 SmallString<128> TmpBuffer;
1473 llvm::raw_svector_ostream OS(TmpBuffer);
1475 // Set up the return result.
1476 Tok.setIdentifierInfo(nullptr);
1477 Tok.clearFlag(Token::NeedsCleaning);
1478 bool IsAtStartOfLine = Tok.isAtStartOfLine();
1479 bool HasLeadingSpace = Tok.hasLeadingSpace();
1481 if (II == Ident__LINE__) {
1482 // C99 6.10.8: "__LINE__: The presumed line number (within the current
1483 // source file) of the current source line (an integer constant)". This can
1484 // be affected by #line.
1485 SourceLocation Loc = Tok.getLocation();
1487 // Advance to the location of the first _, this might not be the first byte
1488 // of the token if it starts with an escaped newline.
1489 Loc = AdvanceToTokenCharacter(Loc, 0);
1491 // One wrinkle here is that GCC expands __LINE__ to location of the *end* of
1492 // a macro expansion. This doesn't matter for object-like macros, but
1493 // can matter for a function-like macro that expands to contain __LINE__.
1494 // Skip down through expansion points until we find a file loc for the
1495 // end of the expansion history.
1496 Loc = SourceMgr.getExpansionRange(Loc).getEnd();
1497 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Loc);
1499 // __LINE__ expands to a simple numeric value.
1500 OS << (PLoc.isValid()? PLoc.getLine() : 1);
1501 Tok.setKind(tok::numeric_constant);
1502 } else if (II == Ident__FILE__ || II == Ident__BASE_FILE__ ||
1503 II == Ident__FILE_NAME__) {
1504 // C99 6.10.8: "__FILE__: The presumed name of the current source file (a
1505 // character string literal)". This can be affected by #line.
1506 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
1508 // __BASE_FILE__ is a GNU extension that returns the top of the presumed
1509 // #include stack instead of the current file.
1510 if (II == Ident__BASE_FILE__ && PLoc.isValid()) {
1511 SourceLocation NextLoc = PLoc.getIncludeLoc();
1512 while (NextLoc.isValid()) {
1513 PLoc = SourceMgr.getPresumedLoc(NextLoc);
1514 if (PLoc.isInvalid())
1517 NextLoc = PLoc.getIncludeLoc();
1521 // Escape this filename. Turn '\' -> '\\' '"' -> '\"'
1522 SmallString<256> FN;
1523 if (PLoc.isValid()) {
1524 // __FILE_NAME__ is a Clang-specific extension that expands to the
1525 // the last part of __FILE__.
1526 if (II == Ident__FILE_NAME__) {
1527 // Try to get the last path component, failing that return the original
1528 // presumed location.
1529 StringRef PLFileName = llvm::sys::path::filename(PLoc.getFilename());
1530 if (PLFileName != "")
1533 FN += PLoc.getFilename();
1535 FN += PLoc.getFilename();
1537 getLangOpts().remapPathPrefix(FN);
1538 Lexer::Stringify(FN);
1539 OS << '"' << FN << '"';
1541 Tok.setKind(tok::string_literal);
1542 } else if (II == Ident__DATE__) {
1543 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1544 if (!DATELoc.isValid())
1545 ComputeDATE_TIME(DATELoc, TIMELoc, *this);
1546 Tok.setKind(tok::string_literal);
1547 Tok.setLength(strlen("\"Mmm dd yyyy\""));
1548 Tok.setLocation(SourceMgr.createExpansionLoc(DATELoc, Tok.getLocation(),
1552 } else if (II == Ident__TIME__) {
1553 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1554 if (!TIMELoc.isValid())
1555 ComputeDATE_TIME(DATELoc, TIMELoc, *this);
1556 Tok.setKind(tok::string_literal);
1557 Tok.setLength(strlen("\"hh:mm:ss\""));
1558 Tok.setLocation(SourceMgr.createExpansionLoc(TIMELoc, Tok.getLocation(),
1562 } else if (II == Ident__INCLUDE_LEVEL__) {
1563 // Compute the presumed include depth of this token. This can be affected
1564 // by GNU line markers.
1567 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
1568 if (PLoc.isValid()) {
1569 PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
1570 for (; PLoc.isValid(); ++Depth)
1571 PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
1574 // __INCLUDE_LEVEL__ expands to a simple numeric value.
1576 Tok.setKind(tok::numeric_constant);
1577 } else if (II == Ident__TIMESTAMP__) {
1578 Diag(Tok.getLocation(), diag::warn_pp_date_time);
1579 // MSVC, ICC, GCC, VisualAge C++ extension. The generated string should be
1580 // of the form "Ddd Mmm dd hh::mm::ss yyyy", which is returned by asctime.
1582 // Get the file that we are lexing out of. If we're currently lexing from
1583 // a macro, dig into the include stack.
1584 const FileEntry *CurFile = nullptr;
1585 PreprocessorLexer *TheLexer = getCurrentFileLexer();
1588 CurFile = SourceMgr.getFileEntryForID(TheLexer->getFileID());
1592 time_t TT = CurFile->getModificationTime();
1593 struct tm *TM = localtime(&TT);
1594 Result = asctime(TM);
1596 Result = "??? ??? ?? ??:??:?? ????\n";
1598 // Surround the string with " and strip the trailing newline.
1599 OS << '"' << StringRef(Result).drop_back() << '"';
1600 Tok.setKind(tok::string_literal);
1601 } else if (II == Ident__COUNTER__) {
1602 // __COUNTER__ expands to a simple numeric value.
1603 OS << CounterValue++;
1604 Tok.setKind(tok::numeric_constant);
1605 } else if (II == Ident__has_feature) {
1606 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1607 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1608 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1609 diag::err_feature_check_malformed);
1610 return II && HasFeature(*this, II->getName());
1612 } else if (II == Ident__has_extension) {
1613 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1614 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1615 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1616 diag::err_feature_check_malformed);
1617 return II && HasExtension(*this, II->getName());
1619 } else if (II == Ident__has_builtin) {
1620 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1621 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1622 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1623 diag::err_feature_check_malformed);
1626 else if (II->getBuiltinID() != 0) {
1627 switch (II->getBuiltinID()) {
1628 case Builtin::BI__builtin_operator_new:
1629 case Builtin::BI__builtin_operator_delete:
1630 // denotes date of behavior change to support calling arbitrary
1631 // usual allocation and deallocation functions. Required by libc++
1637 } else if (II->getTokenID() != tok::identifier ||
1638 II->hasRevertedTokenIDToIdentifier()) {
1639 // Treat all keywords that introduce a custom syntax of the form
1641 // '__some_keyword' '(' [...] ')'
1643 // as being "builtin functions", even if the syntax isn't a valid
1644 // function call (for example, because the builtin takes a type
1646 if (II->getName().startswith("__builtin_") ||
1647 II->getName().startswith("__is_") ||
1648 II->getName().startswith("__has_"))
1650 return llvm::StringSwitch<bool>(II->getName())
1651 .Case("__array_rank", true)
1652 .Case("__array_extent", true)
1653 .Case("__reference_binds_to_temporary", true)
1654 .Case("__underlying_type", true)
1657 return llvm::StringSwitch<bool>(II->getName())
1658 // Report builtin templates as being builtins.
1659 .Case("__make_integer_seq", getLangOpts().CPlusPlus)
1660 .Case("__type_pack_element", getLangOpts().CPlusPlus)
1661 // Likewise for some builtin preprocessor macros.
1662 // FIXME: This is inconsistent; we usually suggest detecting
1663 // builtin macros via #ifdef. Don't add more cases here.
1664 .Case("__is_target_arch", true)
1665 .Case("__is_target_vendor", true)
1666 .Case("__is_target_os", true)
1667 .Case("__is_target_environment", true)
1671 } else if (II == Ident__is_identifier) {
1672 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1673 [](Token &Tok, bool &HasLexedNextToken) -> int {
1674 return Tok.is(tok::identifier);
1676 } else if (II == Ident__has_attribute) {
1677 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1678 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1679 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1680 diag::err_feature_check_malformed);
1681 return II ? hasAttribute(AttrSyntax::GNU, nullptr, II,
1682 getTargetInfo(), getLangOpts()) : 0;
1684 } else if (II == Ident__has_declspec) {
1685 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1686 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1687 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1688 diag::err_feature_check_malformed);
1690 const LangOptions &LangOpts = getLangOpts();
1691 return LangOpts.DeclSpecKeyword &&
1692 hasAttribute(AttrSyntax::Declspec, nullptr, II,
1693 getTargetInfo(), LangOpts);
1698 } else if (II == Ident__has_cpp_attribute ||
1699 II == Ident__has_c_attribute) {
1700 bool IsCXX = II == Ident__has_cpp_attribute;
1701 EvaluateFeatureLikeBuiltinMacro(
1702 OS, Tok, II, *this, [&](Token &Tok, bool &HasLexedNextToken) -> int {
1703 IdentifierInfo *ScopeII = nullptr;
1704 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1705 Tok, *this, diag::err_feature_check_malformed);
1709 // It is possible to receive a scope token. Read the "::", if it is
1710 // available, and the subsequent identifier.
1711 LexUnexpandedToken(Tok);
1712 if (Tok.isNot(tok::coloncolon))
1713 HasLexedNextToken = true;
1716 LexUnexpandedToken(Tok);
1717 II = ExpectFeatureIdentifierInfo(Tok, *this,
1718 diag::err_feature_check_malformed);
1721 AttrSyntax Syntax = IsCXX ? AttrSyntax::CXX : AttrSyntax::C;
1722 return II ? hasAttribute(Syntax, ScopeII, II, getTargetInfo(),
1726 } else if (II == Ident__has_include ||
1727 II == Ident__has_include_next) {
1728 // The argument to these two builtins should be a parenthesized
1729 // file name string literal using angle brackets (<>) or
1730 // double-quotes ("").
1732 if (II == Ident__has_include)
1733 Value = EvaluateHasInclude(Tok, II, *this);
1735 Value = EvaluateHasIncludeNext(Tok, II, *this);
1737 if (Tok.isNot(tok::r_paren))
1740 Tok.setKind(tok::numeric_constant);
1741 } else if (II == Ident__has_warning) {
1742 // The argument should be a parenthesized string literal.
1743 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1744 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1745 std::string WarningName;
1746 SourceLocation StrStartLoc = Tok.getLocation();
1748 HasLexedNextToken = Tok.is(tok::string_literal);
1749 if (!FinishLexStringLiteral(Tok, WarningName, "'__has_warning'",
1750 /*AllowMacroExpansion=*/false))
1753 // FIXME: Should we accept "-R..." flags here, or should that be
1754 // handled by a separate __has_remark?
1755 if (WarningName.size() < 3 || WarningName[0] != '-' ||
1756 WarningName[1] != 'W') {
1757 Diag(StrStartLoc, diag::warn_has_warning_invalid_option);
1761 // Finally, check if the warning flags maps to a diagnostic group.
1762 // We construct a SmallVector here to talk to getDiagnosticIDs().
1763 // Although we don't use the result, this isn't a hot path, and not
1764 // worth special casing.
1765 SmallVector<diag::kind, 10> Diags;
1766 return !getDiagnostics().getDiagnosticIDs()->
1767 getDiagnosticsInGroup(diag::Flavor::WarningOrError,
1768 WarningName.substr(2), Diags);
1770 } else if (II == Ident__building_module) {
1771 // The argument to this builtin should be an identifier. The
1772 // builtin evaluates to 1 when that identifier names the module we are
1773 // currently building.
1774 EvaluateFeatureLikeBuiltinMacro(OS, Tok, II, *this,
1775 [this](Token &Tok, bool &HasLexedNextToken) -> int {
1776 IdentifierInfo *II = ExpectFeatureIdentifierInfo(Tok, *this,
1777 diag::err_expected_id_building_module);
1778 return getLangOpts().isCompilingModule() && II &&
1779 (II->getName() == getLangOpts().CurrentModule);
1781 } else if (II == Ident__MODULE__) {
1782 // The current module as an identifier.
1783 OS << getLangOpts().CurrentModule;
1784 IdentifierInfo *ModuleII = getIdentifierInfo(getLangOpts().CurrentModule);
1785 Tok.setIdentifierInfo(ModuleII);
1786 Tok.setKind(ModuleII->getTokenID());
1787 } else if (II == Ident__identifier) {
1788 SourceLocation Loc = Tok.getLocation();
1790 // We're expecting '__identifier' '(' identifier ')'. Try to recover
1791 // if the parens are missing.
1793 if (Tok.isNot(tok::l_paren)) {
1794 // No '(', use end of last token.
1795 Diag(getLocForEndOfToken(Loc), diag::err_pp_expected_after)
1796 << II << tok::l_paren;
1797 // If the next token isn't valid as our argument, we can't recover.
1798 if (!Tok.isAnnotation() && Tok.getIdentifierInfo())
1799 Tok.setKind(tok::identifier);
1803 SourceLocation LParenLoc = Tok.getLocation();
1806 if (!Tok.isAnnotation() && Tok.getIdentifierInfo())
1807 Tok.setKind(tok::identifier);
1808 else if (Tok.is(tok::string_literal) && !Tok.hasUDSuffix()) {
1809 StringLiteralParser Literal(Tok, *this);
1810 if (Literal.hadError)
1813 Tok.setIdentifierInfo(getIdentifierInfo(Literal.GetString()));
1814 Tok.setKind(tok::identifier);
1816 Diag(Tok.getLocation(), diag::err_pp_identifier_arg_not_identifier)
1818 // Don't walk past anything that's not a real token.
1819 if (Tok.isOneOf(tok::eof, tok::eod) || Tok.isAnnotation())
1823 // Discard the ')', preserving 'Tok' as our result.
1825 LexNonComment(RParen);
1826 if (RParen.isNot(tok::r_paren)) {
1827 Diag(getLocForEndOfToken(Tok.getLocation()), diag::err_pp_expected_after)
1828 << Tok.getKind() << tok::r_paren;
1829 Diag(LParenLoc, diag::note_matching) << tok::l_paren;
1832 } else if (II == Ident__is_target_arch) {
1833 EvaluateFeatureLikeBuiltinMacro(
1834 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1835 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1836 Tok, *this, diag::err_feature_check_malformed);
1837 return II && isTargetArch(getTargetInfo(), II);
1839 } else if (II == Ident__is_target_vendor) {
1840 EvaluateFeatureLikeBuiltinMacro(
1841 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1842 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1843 Tok, *this, diag::err_feature_check_malformed);
1844 return II && isTargetVendor(getTargetInfo(), II);
1846 } else if (II == Ident__is_target_os) {
1847 EvaluateFeatureLikeBuiltinMacro(
1848 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1849 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1850 Tok, *this, diag::err_feature_check_malformed);
1851 return II && isTargetOS(getTargetInfo(), II);
1853 } else if (II == Ident__is_target_environment) {
1854 EvaluateFeatureLikeBuiltinMacro(
1855 OS, Tok, II, *this, [this](Token &Tok, bool &HasLexedNextToken) -> int {
1856 IdentifierInfo *II = ExpectFeatureIdentifierInfo(
1857 Tok, *this, diag::err_feature_check_malformed);
1858 return II && isTargetEnvironment(getTargetInfo(), II);
1861 llvm_unreachable("Unknown identifier!");
1863 CreateString(OS.str(), Tok, Tok.getLocation(), Tok.getLocation());
1864 Tok.setFlagValue(Token::StartOfLine, IsAtStartOfLine);
1865 Tok.setFlagValue(Token::LeadingSpace, HasLeadingSpace);
1868 void Preprocessor::markMacroAsUsed(MacroInfo *MI) {
1869 // If the 'used' status changed, and the macro requires 'unused' warning,
1870 // remove its SourceLocation from the warn-for-unused-macro locations.
1871 if (MI->isWarnIfUnused() && !MI->isUsed())
1872 WarnUnusedMacroLocs.erase(MI->getDefinitionLoc());
1873 MI->setIsUsed(true);