1 //===--- PPDirectives.cpp - Directive Handling for Preprocessor -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Implements # directive processing for the Preprocessor.
13 //===----------------------------------------------------------------------===//
15 #include "clang/Lex/Preprocessor.h"
16 #include "clang/Basic/FileManager.h"
17 #include "clang/Basic/SourceManager.h"
18 #include "clang/Lex/CodeCompletionHandler.h"
19 #include "clang/Lex/HeaderSearch.h"
20 #include "clang/Lex/HeaderSearchOptions.h"
21 #include "clang/Lex/LexDiagnostic.h"
22 #include "clang/Lex/LiteralSupport.h"
23 #include "clang/Lex/MacroInfo.h"
24 #include "clang/Lex/ModuleLoader.h"
25 #include "clang/Lex/Pragma.h"
26 #include "llvm/ADT/APInt.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/Path.h"
29 #include "llvm/Support/SaveAndRestore.h"
30 using namespace clang;
32 //===----------------------------------------------------------------------===//
33 // Utility Methods for Preprocessor Directive Handling.
34 //===----------------------------------------------------------------------===//
36 MacroInfo *Preprocessor::AllocateMacroInfo() {
37 MacroInfoChain *MIChain = BP.Allocate<MacroInfoChain>();
38 MIChain->Next = MIChainHead;
39 MIChainHead = MIChain;
43 MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) {
44 MacroInfo *MI = AllocateMacroInfo();
45 new (MI) MacroInfo(L);
49 MacroInfo *Preprocessor::AllocateDeserializedMacroInfo(SourceLocation L,
50 unsigned SubModuleID) {
51 static_assert(llvm::AlignOf<MacroInfo>::Alignment >= sizeof(SubModuleID),
52 "alignment for MacroInfo is less than the ID");
53 DeserializedMacroInfoChain *MIChain =
54 BP.Allocate<DeserializedMacroInfoChain>();
55 MIChain->Next = DeserialMIChainHead;
56 DeserialMIChainHead = MIChain;
58 MacroInfo *MI = &MIChain->MI;
59 new (MI) MacroInfo(L);
60 MI->FromASTFile = true;
61 MI->setOwningModuleID(SubModuleID);
65 DefMacroDirective *Preprocessor::AllocateDefMacroDirective(MacroInfo *MI,
67 return new (BP) DefMacroDirective(MI, Loc);
71 Preprocessor::AllocateUndefMacroDirective(SourceLocation UndefLoc) {
72 return new (BP) UndefMacroDirective(UndefLoc);
75 VisibilityMacroDirective *
76 Preprocessor::AllocateVisibilityMacroDirective(SourceLocation Loc,
78 return new (BP) VisibilityMacroDirective(Loc, isPublic);
81 /// \brief Read and discard all tokens remaining on the current line until
82 /// the tok::eod token is found.
83 void Preprocessor::DiscardUntilEndOfDirective() {
86 LexUnexpandedToken(Tmp);
87 assert(Tmp.isNot(tok::eof) && "EOF seen while discarding directive tokens");
88 } while (Tmp.isNot(tok::eod));
91 /// \brief Enumerates possible cases of #define/#undef a reserved identifier.
93 MD_NoWarn, //> Not a reserved identifier
94 MD_KeywordDef, //> Macro hides keyword, enabled by default
95 MD_ReservedMacro //> #define of #undef reserved id, disabled by default
98 /// \brief Checks if the specified identifier is reserved in the specified
100 /// This function does not check if the identifier is a keyword.
101 static bool isReservedId(StringRef Text, const LangOptions &Lang) {
102 // C++ [macro.names], C11 7.1.3:
103 // All identifiers that begin with an underscore and either an uppercase
104 // letter or another underscore are always reserved for any use.
105 if (Text.size() >= 2 && Text[0] == '_' &&
106 (isUppercase(Text[1]) || Text[1] == '_'))
108 // C++ [global.names]
109 // Each name that contains a double underscore ... is reserved to the
110 // implementation for any use.
111 if (Lang.CPlusPlus) {
112 if (Text.find("__") != StringRef::npos)
118 static MacroDiag shouldWarnOnMacroDef(Preprocessor &PP, IdentifierInfo *II) {
119 const LangOptions &Lang = PP.getLangOpts();
120 StringRef Text = II->getName();
121 if (isReservedId(Text, Lang))
122 return MD_ReservedMacro;
123 if (II->isKeyword(Lang))
124 return MD_KeywordDef;
125 if (Lang.CPlusPlus11 && (Text.equals("override") || Text.equals("final")))
126 return MD_KeywordDef;
130 static MacroDiag shouldWarnOnMacroUndef(Preprocessor &PP, IdentifierInfo *II) {
131 const LangOptions &Lang = PP.getLangOpts();
132 StringRef Text = II->getName();
133 // Do not warn on keyword undef. It is generally harmless and widely used.
134 if (isReservedId(Text, Lang))
135 return MD_ReservedMacro;
139 bool Preprocessor::CheckMacroName(Token &MacroNameTok, MacroUse isDefineUndef,
141 // Missing macro name?
142 if (MacroNameTok.is(tok::eod))
143 return Diag(MacroNameTok, diag::err_pp_missing_macro_name);
145 IdentifierInfo *II = MacroNameTok.getIdentifierInfo();
147 bool Invalid = false;
148 std::string Spelling = getSpelling(MacroNameTok, &Invalid);
150 return Diag(MacroNameTok, diag::err_pp_macro_not_identifier);
151 II = getIdentifierInfo(Spelling);
153 if (!II->isCPlusPlusOperatorKeyword())
154 return Diag(MacroNameTok, diag::err_pp_macro_not_identifier);
156 // C++ 2.5p2: Alternative tokens behave the same as its primary token
157 // except for their spellings.
158 Diag(MacroNameTok, getLangOpts().MicrosoftExt
159 ? diag::ext_pp_operator_used_as_macro_name
160 : diag::err_pp_operator_used_as_macro_name)
161 << II << MacroNameTok.getKind();
163 // Allow #defining |and| and friends for Microsoft compatibility or
164 // recovery when legacy C headers are included in C++.
165 MacroNameTok.setIdentifierInfo(II);
168 if ((isDefineUndef != MU_Other) && II->getPPKeywordID() == tok::pp_defined) {
169 // Error if defining "defined": C99 6.10.8/4, C++ [cpp.predefined]p4.
170 return Diag(MacroNameTok, diag::err_defined_macro_name);
173 if (isDefineUndef == MU_Undef) {
174 auto *MI = getMacroInfo(II);
175 if (MI && MI->isBuiltinMacro()) {
176 // Warn if undefining "__LINE__" and other builtins, per C99 6.10.8/4
177 // and C++ [cpp.predefined]p4], but allow it as an extension.
178 Diag(MacroNameTok, diag::ext_pp_undef_builtin_macro);
182 // If defining/undefining reserved identifier or a keyword, we need to issue
184 SourceLocation MacroNameLoc = MacroNameTok.getLocation();
187 if (!SourceMgr.isInSystemHeader(MacroNameLoc) &&
188 (strcmp(SourceMgr.getBufferName(MacroNameLoc), "<built-in>") != 0)) {
189 MacroDiag D = MD_NoWarn;
190 if (isDefineUndef == MU_Define) {
191 D = shouldWarnOnMacroDef(*this, II);
193 else if (isDefineUndef == MU_Undef)
194 D = shouldWarnOnMacroUndef(*this, II);
195 if (D == MD_KeywordDef) {
196 // We do not want to warn on some patterns widely used in configuration
197 // scripts. This requires analyzing next tokens, so do not issue warnings
198 // now, only inform caller.
202 if (D == MD_ReservedMacro)
203 Diag(MacroNameTok, diag::warn_pp_macro_is_reserved_id);
206 // Okay, we got a good identifier.
210 /// \brief Lex and validate a macro name, which occurs after a
211 /// \#define or \#undef.
213 /// This sets the token kind to eod and discards the rest of the macro line if
214 /// the macro name is invalid.
216 /// \param MacroNameTok Token that is expected to be a macro name.
217 /// \param isDefineUndef Context in which macro is used.
218 /// \param ShadowFlag Points to a flag that is set if macro shadows a keyword.
219 void Preprocessor::ReadMacroName(Token &MacroNameTok, MacroUse isDefineUndef,
221 // Read the token, don't allow macro expansion on it.
222 LexUnexpandedToken(MacroNameTok);
224 if (MacroNameTok.is(tok::code_completion)) {
226 CodeComplete->CodeCompleteMacroName(isDefineUndef == MU_Define);
227 setCodeCompletionReached();
228 LexUnexpandedToken(MacroNameTok);
231 if (!CheckMacroName(MacroNameTok, isDefineUndef, ShadowFlag))
234 // Invalid macro name, read and discard the rest of the line and set the
235 // token kind to tok::eod if necessary.
236 if (MacroNameTok.isNot(tok::eod)) {
237 MacroNameTok.setKind(tok::eod);
238 DiscardUntilEndOfDirective();
242 /// \brief Ensure that the next token is a tok::eod token.
244 /// If not, emit a diagnostic and consume up until the eod. If EnableMacros is
245 /// true, then we consider macros that expand to zero tokens as being ok.
246 void Preprocessor::CheckEndOfDirective(const char *DirType, bool EnableMacros) {
248 // Lex unexpanded tokens for most directives: macros might expand to zero
249 // tokens, causing us to miss diagnosing invalid lines. Some directives (like
250 // #line) allow empty macros.
254 LexUnexpandedToken(Tmp);
256 // There should be no tokens after the directive, but we allow them as an
258 while (Tmp.is(tok::comment)) // Skip comments in -C mode.
259 LexUnexpandedToken(Tmp);
261 if (Tmp.isNot(tok::eod)) {
262 // Add a fixit in GNU/C99/C++ mode. Don't offer a fixit for strict-C89,
263 // or if this is a macro-style preprocessing directive, because it is more
264 // trouble than it is worth to insert /**/ and check that there is no /**/
265 // in the range also.
267 if ((LangOpts.GNUMode || LangOpts.C99 || LangOpts.CPlusPlus) &&
269 Hint = FixItHint::CreateInsertion(Tmp.getLocation(),"//");
270 Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType << Hint;
271 DiscardUntilEndOfDirective();
277 /// SkipExcludedConditionalBlock - We just read a \#if or related directive and
278 /// decided that the subsequent tokens are in the \#if'd out portion of the
279 /// file. Lex the rest of the file, until we see an \#endif. If
280 /// FoundNonSkipPortion is true, then we have already emitted code for part of
281 /// this \#if directive, so \#else/\#elif blocks should never be entered.
282 /// If ElseOk is true, then \#else directives are ok, if not, then we have
283 /// already seen one so a \#else directive is a duplicate. When this returns,
284 /// the caller can lex the first valid token.
285 void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc,
286 bool FoundNonSkipPortion,
288 SourceLocation ElseLoc) {
290 assert(!CurTokenLexer && CurPPLexer && "Lexing a macro, not a file?");
292 CurPPLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false,
293 FoundNonSkipPortion, FoundElse);
296 PTHSkipExcludedConditionalBlock();
300 // Enter raw mode to disable identifier lookup (and thus macro expansion),
301 // disabling warnings, etc.
302 CurPPLexer->LexingRawMode = true;
307 if (Tok.is(tok::code_completion)) {
309 CodeComplete->CodeCompleteInConditionalExclusion();
310 setCodeCompletionReached();
314 // If this is the end of the buffer, we have an error.
315 if (Tok.is(tok::eof)) {
316 // Emit errors for each unterminated conditional on the stack, including
318 while (!CurPPLexer->ConditionalStack.empty()) {
319 if (CurLexer->getFileLoc() != CodeCompletionFileLoc)
320 Diag(CurPPLexer->ConditionalStack.back().IfLoc,
321 diag::err_pp_unterminated_conditional);
322 CurPPLexer->ConditionalStack.pop_back();
325 // Just return and let the caller lex after this #include.
329 // If this token is not a preprocessor directive, just skip it.
330 if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine())
333 // We just parsed a # character at the start of a line, so we're in
334 // directive mode. Tell the lexer this so any newlines we see will be
335 // converted into an EOD token (this terminates the macro).
336 CurPPLexer->ParsingPreprocessorDirective = true;
337 if (CurLexer) CurLexer->SetKeepWhitespaceMode(false);
340 // Read the next token, the directive flavor.
341 LexUnexpandedToken(Tok);
343 // If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or
344 // something bogus), skip it.
345 if (Tok.isNot(tok::raw_identifier)) {
346 CurPPLexer->ParsingPreprocessorDirective = false;
347 // Restore comment saving mode.
348 if (CurLexer) CurLexer->resetExtendedTokenMode();
352 // If the first letter isn't i or e, it isn't intesting to us. We know that
353 // this is safe in the face of spelling differences, because there is no way
354 // to spell an i/e in a strange way that is another letter. Skipping this
355 // allows us to avoid looking up the identifier info for #define/#undef and
356 // other common directives.
357 StringRef RI = Tok.getRawIdentifier();
359 char FirstChar = RI[0];
360 if (FirstChar >= 'a' && FirstChar <= 'z' &&
361 FirstChar != 'i' && FirstChar != 'e') {
362 CurPPLexer->ParsingPreprocessorDirective = false;
363 // Restore comment saving mode.
364 if (CurLexer) CurLexer->resetExtendedTokenMode();
368 // Get the identifier name without trigraphs or embedded newlines. Note
369 // that we can't use Tok.getIdentifierInfo() because its lookup is disabled
371 char DirectiveBuf[20];
373 if (!Tok.needsCleaning() && RI.size() < 20) {
376 std::string DirectiveStr = getSpelling(Tok);
377 unsigned IdLen = DirectiveStr.size();
379 CurPPLexer->ParsingPreprocessorDirective = false;
380 // Restore comment saving mode.
381 if (CurLexer) CurLexer->resetExtendedTokenMode();
384 memcpy(DirectiveBuf, &DirectiveStr[0], IdLen);
385 Directive = StringRef(DirectiveBuf, IdLen);
388 if (Directive.startswith("if")) {
389 StringRef Sub = Directive.substr(2);
390 if (Sub.empty() || // "if"
391 Sub == "def" || // "ifdef"
392 Sub == "ndef") { // "ifndef"
393 // We know the entire #if/#ifdef/#ifndef block will be skipped, don't
394 // bother parsing the condition.
395 DiscardUntilEndOfDirective();
396 CurPPLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true,
397 /*foundnonskip*/false,
400 } else if (Directive[0] == 'e') {
401 StringRef Sub = Directive.substr(1);
402 if (Sub == "ndif") { // "endif"
403 PPConditionalInfo CondInfo;
404 CondInfo.WasSkipping = true; // Silence bogus warning.
405 bool InCond = CurPPLexer->popConditionalLevel(CondInfo);
406 (void)InCond; // Silence warning in no-asserts mode.
407 assert(!InCond && "Can't be skipping if not in a conditional!");
409 // If we popped the outermost skipping block, we're done skipping!
410 if (!CondInfo.WasSkipping) {
411 // Restore the value of LexingRawMode so that trailing comments
412 // are handled correctly, if we've reached the outermost block.
413 CurPPLexer->LexingRawMode = false;
414 CheckEndOfDirective("endif");
415 CurPPLexer->LexingRawMode = true;
417 Callbacks->Endif(Tok.getLocation(), CondInfo.IfLoc);
420 DiscardUntilEndOfDirective();
422 } else if (Sub == "lse") { // "else".
423 // #else directive in a skipping conditional. If not in some other
424 // skipping conditional, and if #else hasn't already been seen, enter it
425 // as a non-skipping conditional.
426 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
428 // If this is a #else with a #else before it, report the error.
429 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else);
431 // Note that we've seen a #else in this conditional.
432 CondInfo.FoundElse = true;
434 // If the conditional is at the top level, and the #if block wasn't
435 // entered, enter the #else block now.
436 if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) {
437 CondInfo.FoundNonSkip = true;
438 // Restore the value of LexingRawMode so that trailing comments
439 // are handled correctly.
440 CurPPLexer->LexingRawMode = false;
441 CheckEndOfDirective("else");
442 CurPPLexer->LexingRawMode = true;
444 Callbacks->Else(Tok.getLocation(), CondInfo.IfLoc);
447 DiscardUntilEndOfDirective(); // C99 6.10p4.
449 } else if (Sub == "lif") { // "elif".
450 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
452 // If this is a #elif with a #else before it, report the error.
453 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else);
455 // If this is in a skipping block or if we're already handled this #if
456 // block, don't bother parsing the condition.
457 if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) {
458 DiscardUntilEndOfDirective();
460 const SourceLocation CondBegin = CurPPLexer->getSourceLocation();
461 // Restore the value of LexingRawMode so that identifiers are
462 // looked up, etc, inside the #elif expression.
463 assert(CurPPLexer->LexingRawMode && "We have to be skipping here!");
464 CurPPLexer->LexingRawMode = false;
465 IdentifierInfo *IfNDefMacro = nullptr;
466 const bool CondValue = EvaluateDirectiveExpression(IfNDefMacro);
467 CurPPLexer->LexingRawMode = true;
469 const SourceLocation CondEnd = CurPPLexer->getSourceLocation();
470 Callbacks->Elif(Tok.getLocation(),
471 SourceRange(CondBegin, CondEnd),
472 (CondValue ? PPCallbacks::CVK_True : PPCallbacks::CVK_False), CondInfo.IfLoc);
474 // If this condition is true, enter it!
476 CondInfo.FoundNonSkip = true;
483 CurPPLexer->ParsingPreprocessorDirective = false;
484 // Restore comment saving mode.
485 if (CurLexer) CurLexer->resetExtendedTokenMode();
488 // Finally, if we are out of the conditional (saw an #endif or ran off the end
489 // of the file, just stop skipping and return to lexing whatever came after
491 CurPPLexer->LexingRawMode = false;
494 SourceLocation BeginLoc = ElseLoc.isValid() ? ElseLoc : IfTokenLoc;
495 Callbacks->SourceRangeSkipped(SourceRange(BeginLoc, Tok.getLocation()));
499 void Preprocessor::PTHSkipExcludedConditionalBlock() {
503 assert(CurPTHLexer->LexingRawMode == false);
505 // Skip to the next '#else', '#elif', or #endif.
506 if (CurPTHLexer->SkipBlock()) {
507 // We have reached an #endif. Both the '#' and 'endif' tokens
508 // have been consumed by the PTHLexer. Just pop off the condition level.
509 PPConditionalInfo CondInfo;
510 bool InCond = CurPTHLexer->popConditionalLevel(CondInfo);
511 (void)InCond; // Silence warning in no-asserts mode.
512 assert(!InCond && "Can't be skipping if not in a conditional!");
516 // We have reached a '#else' or '#elif'. Lex the next token to get
517 // the directive flavor.
519 LexUnexpandedToken(Tok);
521 // We can actually look up the IdentifierInfo here since we aren't in
523 tok::PPKeywordKind K = Tok.getIdentifierInfo()->getPPKeywordID();
525 if (K == tok::pp_else) {
526 // #else: Enter the else condition. We aren't in a nested condition
527 // since we skip those. We're always in the one matching the last
528 // blocked we skipped.
529 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
530 // Note that we've seen a #else in this conditional.
531 CondInfo.FoundElse = true;
533 // If the #if block wasn't entered then enter the #else block now.
534 if (!CondInfo.FoundNonSkip) {
535 CondInfo.FoundNonSkip = true;
537 // Scan until the eod token.
538 CurPTHLexer->ParsingPreprocessorDirective = true;
539 DiscardUntilEndOfDirective();
540 CurPTHLexer->ParsingPreprocessorDirective = false;
545 // Otherwise skip this block.
549 assert(K == tok::pp_elif);
550 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
552 // If this is a #elif with a #else before it, report the error.
553 if (CondInfo.FoundElse)
554 Diag(Tok, diag::pp_err_elif_after_else);
556 // If this is in a skipping block or if we're already handled this #if
557 // block, don't bother parsing the condition. We just skip this block.
558 if (CondInfo.FoundNonSkip)
561 // Evaluate the condition of the #elif.
562 IdentifierInfo *IfNDefMacro = nullptr;
563 CurPTHLexer->ParsingPreprocessorDirective = true;
564 bool ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
565 CurPTHLexer->ParsingPreprocessorDirective = false;
567 // If this condition is true, enter it!
569 CondInfo.FoundNonSkip = true;
573 // Otherwise, skip this block and go to the next one.
578 Module *Preprocessor::getModuleForLocation(SourceLocation Loc) {
579 ModuleMap &ModMap = HeaderInfo.getModuleMap();
580 if (SourceMgr.isInMainFile(Loc)) {
581 if (Module *CurMod = getCurrentModule())
582 return CurMod; // Compiling a module.
583 return HeaderInfo.getModuleMap().SourceModule; // Compiling a source.
585 // Try to determine the module of the include directive.
586 // FIXME: Look into directly passing the FileEntry from LookupFile instead.
587 FileID IDOfIncl = SourceMgr.getFileID(SourceMgr.getExpansionLoc(Loc));
588 if (const FileEntry *EntryOfIncl = SourceMgr.getFileEntryForID(IDOfIncl)) {
589 // The include comes from a file.
590 return ModMap.findModuleForHeader(EntryOfIncl).getModule();
592 // The include does not come from a file,
593 // so it is probably a module compilation.
594 return getCurrentModule();
598 Module *Preprocessor::getModuleContainingLocation(SourceLocation Loc) {
599 return HeaderInfo.getModuleMap().inferModuleFromLocation(
600 FullSourceLoc(Loc, SourceMgr));
603 const FileEntry *Preprocessor::LookupFile(
604 SourceLocation FilenameLoc,
607 const DirectoryLookup *FromDir,
608 const FileEntry *FromFile,
609 const DirectoryLookup *&CurDir,
610 SmallVectorImpl<char> *SearchPath,
611 SmallVectorImpl<char> *RelativePath,
612 ModuleMap::KnownHeader *SuggestedModule,
614 // If the header lookup mechanism may be relative to the current inclusion
615 // stack, record the parent #includes.
616 SmallVector<std::pair<const FileEntry *, const DirectoryEntry *>, 16>
618 if (!FromDir && !FromFile) {
619 FileID FID = getCurrentFileLexer()->getFileID();
620 const FileEntry *FileEnt = SourceMgr.getFileEntryForID(FID);
622 // If there is no file entry associated with this file, it must be the
623 // predefines buffer or the module includes buffer. Any other file is not
624 // lexed with a normal lexer, so it won't be scanned for preprocessor
627 // If we have the predefines buffer, resolve #include references (which come
628 // from the -include command line argument) from the current working
629 // directory instead of relative to the main file.
631 // If we have the module includes buffer, resolve #include references (which
632 // come from header declarations in the module map) relative to the module
635 if (FID == SourceMgr.getMainFileID() && MainFileDir)
636 Includers.push_back(std::make_pair(nullptr, MainFileDir));
638 SourceMgr.getFileEntryForID(SourceMgr.getMainFileID())))
639 Includers.push_back(std::make_pair(FileEnt, FileMgr.getDirectory(".")));
641 Includers.push_back(std::make_pair(FileEnt, FileEnt->getDir()));
644 // MSVC searches the current include stack from top to bottom for
645 // headers included by quoted include directives.
646 // See: http://msdn.microsoft.com/en-us/library/36k2cdd4.aspx
647 if (LangOpts.MSVCCompat && !isAngled) {
648 for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
649 IncludeStackInfo &ISEntry = IncludeMacroStack[e - i - 1];
650 if (IsFileLexer(ISEntry))
651 if ((FileEnt = SourceMgr.getFileEntryForID(
652 ISEntry.ThePPLexer->getFileID())))
653 Includers.push_back(std::make_pair(FileEnt, FileEnt->getDir()));
658 CurDir = CurDirLookup;
661 // We're supposed to start looking from after a particular file. Search
662 // the include path until we find that file or run out of files.
663 const DirectoryLookup *TmpCurDir = CurDir;
664 const DirectoryLookup *TmpFromDir = nullptr;
665 while (const FileEntry *FE = HeaderInfo.LookupFile(
666 Filename, FilenameLoc, isAngled, TmpFromDir, TmpCurDir,
667 Includers, SearchPath, RelativePath, SuggestedModule,
669 // Keep looking as if this file did a #include_next.
670 TmpFromDir = TmpCurDir;
672 if (FE == FromFile) {
674 FromDir = TmpFromDir;
681 // Do a standard file entry lookup.
682 const FileEntry *FE = HeaderInfo.LookupFile(
683 Filename, FilenameLoc, isAngled, FromDir, CurDir, Includers, SearchPath,
684 RelativePath, SuggestedModule, SkipCache);
686 if (SuggestedModule && !LangOpts.AsmPreprocessor)
687 HeaderInfo.getModuleMap().diagnoseHeaderInclusion(
688 getModuleForLocation(FilenameLoc), FilenameLoc, Filename, FE);
692 const FileEntry *CurFileEnt;
693 // Otherwise, see if this is a subframework header. If so, this is relative
694 // to one of the headers on the #include stack. Walk the list of the current
695 // headers on the #include stack and pass them to HeaderInfo.
697 if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID()))) {
698 if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt,
699 SearchPath, RelativePath,
701 if (SuggestedModule && !LangOpts.AsmPreprocessor)
702 HeaderInfo.getModuleMap().diagnoseHeaderInclusion(
703 getModuleForLocation(FilenameLoc), FilenameLoc, Filename, FE);
709 for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
710 IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1];
711 if (IsFileLexer(ISEntry)) {
713 SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID()))) {
714 if ((FE = HeaderInfo.LookupSubframeworkHeader(
715 Filename, CurFileEnt, SearchPath, RelativePath,
717 if (SuggestedModule && !LangOpts.AsmPreprocessor)
718 HeaderInfo.getModuleMap().diagnoseHeaderInclusion(
719 getModuleForLocation(FilenameLoc), FilenameLoc, Filename, FE);
726 // Otherwise, we really couldn't find the file.
731 //===----------------------------------------------------------------------===//
732 // Preprocessor Directive Handling.
733 //===----------------------------------------------------------------------===//
735 class Preprocessor::ResetMacroExpansionHelper {
737 ResetMacroExpansionHelper(Preprocessor *pp)
738 : PP(pp), save(pp->DisableMacroExpansion) {
739 if (pp->MacroExpansionInDirectivesOverride)
740 pp->DisableMacroExpansion = false;
742 ~ResetMacroExpansionHelper() {
743 PP->DisableMacroExpansion = save;
750 /// HandleDirective - This callback is invoked when the lexer sees a # token
751 /// at the start of a line. This consumes the directive, modifies the
752 /// lexer/preprocessor state, and advances the lexer(s) so that the next token
753 /// read is the correct one.
754 void Preprocessor::HandleDirective(Token &Result) {
755 // FIXME: Traditional: # with whitespace before it not recognized by K&R?
757 // We just parsed a # character at the start of a line, so we're in directive
758 // mode. Tell the lexer this so any newlines we see will be converted into an
759 // EOD token (which terminates the directive).
760 CurPPLexer->ParsingPreprocessorDirective = true;
761 if (CurLexer) CurLexer->SetKeepWhitespaceMode(false);
763 bool ImmediatelyAfterTopLevelIfndef =
764 CurPPLexer->MIOpt.getImmediatelyAfterTopLevelIfndef();
765 CurPPLexer->MIOpt.resetImmediatelyAfterTopLevelIfndef();
769 // We are about to read a token. For the multiple-include optimization FA to
770 // work, we have to remember if we had read any tokens *before* this
772 bool ReadAnyTokensBeforeDirective =CurPPLexer->MIOpt.getHasReadAnyTokensVal();
774 // Save the '#' token in case we need to return it later.
775 Token SavedHash = Result;
777 // Read the next token, the directive flavor. This isn't expanded due to
779 LexUnexpandedToken(Result);
781 // C99 6.10.3p11: Is this preprocessor directive in macro invocation? e.g.:
786 // If so, the user is relying on undefined behavior, emit a diagnostic. Do
787 // not support this for #include-like directives, since that can result in
788 // terrible diagnostics, and does not work in GCC.
790 if (IdentifierInfo *II = Result.getIdentifierInfo()) {
791 switch (II->getPPKeywordID()) {
792 case tok::pp_include:
794 case tok::pp_include_next:
795 case tok::pp___include_macros:
797 Diag(Result, diag::err_embedded_directive) << II->getName();
798 DiscardUntilEndOfDirective();
804 Diag(Result, diag::ext_embedded_directive);
807 // Temporarily enable macro expansion if set so
808 // and reset to previous state when returning from this function.
809 ResetMacroExpansionHelper helper(this);
811 switch (Result.getKind()) {
813 return; // null directive.
814 case tok::code_completion:
816 CodeComplete->CodeCompleteDirective(
817 CurPPLexer->getConditionalStackDepth() > 0);
818 setCodeCompletionReached();
820 case tok::numeric_constant: // # 7 GNU line marker directive.
821 if (getLangOpts().AsmPreprocessor)
822 break; // # 4 is not a preprocessor directive in .S files.
823 return HandleDigitDirective(Result);
825 IdentifierInfo *II = Result.getIdentifierInfo();
826 if (!II) break; // Not an identifier.
828 // Ask what the preprocessor keyword ID is.
829 switch (II->getPPKeywordID()) {
831 // C99 6.10.1 - Conditional Inclusion.
833 return HandleIfDirective(Result, ReadAnyTokensBeforeDirective);
835 return HandleIfdefDirective(Result, false, true/*not valid for miopt*/);
837 return HandleIfdefDirective(Result, true, ReadAnyTokensBeforeDirective);
839 return HandleElifDirective(Result);
841 return HandleElseDirective(Result);
843 return HandleEndifDirective(Result);
845 // C99 6.10.2 - Source File Inclusion.
846 case tok::pp_include:
848 return HandleIncludeDirective(SavedHash.getLocation(), Result);
849 case tok::pp___include_macros:
851 return HandleIncludeMacrosDirective(SavedHash.getLocation(), Result);
853 // C99 6.10.3 - Macro Replacement.
855 return HandleDefineDirective(Result, ImmediatelyAfterTopLevelIfndef);
857 return HandleUndefDirective(Result);
859 // C99 6.10.4 - Line Control.
861 return HandleLineDirective(Result);
863 // C99 6.10.5 - Error Directive.
865 return HandleUserDiagnosticDirective(Result, false);
867 // C99 6.10.6 - Pragma Directive.
869 return HandlePragmaDirective(SavedHash.getLocation(), PIK_HashPragma);
873 return HandleImportDirective(SavedHash.getLocation(), Result);
874 case tok::pp_include_next:
875 return HandleIncludeNextDirective(SavedHash.getLocation(), Result);
877 case tok::pp_warning:
878 Diag(Result, diag::ext_pp_warning_directive);
879 return HandleUserDiagnosticDirective(Result, true);
881 return HandleIdentSCCSDirective(Result);
883 return HandleIdentSCCSDirective(Result);
885 //isExtension = true; // FIXME: implement #assert
887 case tok::pp_unassert:
888 //isExtension = true; // FIXME: implement #unassert
891 case tok::pp___public_macro:
892 if (getLangOpts().Modules)
893 return HandleMacroPublicDirective(Result);
896 case tok::pp___private_macro:
897 if (getLangOpts().Modules)
898 return HandleMacroPrivateDirective(Result);
904 // If this is a .S file, treat unknown # directives as non-preprocessor
905 // directives. This is important because # may be a comment or introduce
906 // various pseudo-ops. Just return the # token and push back the following
907 // token to be lexed next time.
908 if (getLangOpts().AsmPreprocessor) {
909 Token *Toks = new Token[2];
910 // Return the # and the token after it.
914 // If the second token is a hashhash token, then we need to translate it to
915 // unknown so the token lexer doesn't try to perform token pasting.
916 if (Result.is(tok::hashhash))
917 Toks[1].setKind(tok::unknown);
919 // Enter this token stream so that we re-lex the tokens. Make sure to
920 // enable macro expansion, in case the token after the # is an identifier
922 EnterTokenStream(Toks, 2, false, true);
926 // If we reached here, the preprocessing token is not valid!
927 Diag(Result, diag::err_pp_invalid_directive);
929 // Read the rest of the PP line.
930 DiscardUntilEndOfDirective();
932 // Okay, we're done parsing the directive.
935 /// GetLineValue - Convert a numeric token into an unsigned value, emitting
936 /// Diagnostic DiagID if it is invalid, and returning the value in Val.
937 static bool GetLineValue(Token &DigitTok, unsigned &Val,
938 unsigned DiagID, Preprocessor &PP,
939 bool IsGNULineDirective=false) {
940 if (DigitTok.isNot(tok::numeric_constant)) {
941 PP.Diag(DigitTok, DiagID);
943 if (DigitTok.isNot(tok::eod))
944 PP.DiscardUntilEndOfDirective();
948 SmallString<64> IntegerBuffer;
949 IntegerBuffer.resize(DigitTok.getLength());
950 const char *DigitTokBegin = &IntegerBuffer[0];
951 bool Invalid = false;
952 unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin, &Invalid);
956 // Verify that we have a simple digit-sequence, and compute the value. This
957 // is always a simple digit string computed in decimal, so we do this manually
960 for (unsigned i = 0; i != ActualLength; ++i) {
961 // C++1y [lex.fcon]p1:
962 // Optional separating single quotes in a digit-sequence are ignored
963 if (DigitTokBegin[i] == '\'')
966 if (!isDigit(DigitTokBegin[i])) {
967 PP.Diag(PP.AdvanceToTokenCharacter(DigitTok.getLocation(), i),
968 diag::err_pp_line_digit_sequence) << IsGNULineDirective;
969 PP.DiscardUntilEndOfDirective();
973 unsigned NextVal = Val*10+(DigitTokBegin[i]-'0');
974 if (NextVal < Val) { // overflow.
975 PP.Diag(DigitTok, DiagID);
976 PP.DiscardUntilEndOfDirective();
982 if (DigitTokBegin[0] == '0' && Val)
983 PP.Diag(DigitTok.getLocation(), diag::warn_pp_line_decimal)
984 << IsGNULineDirective;
989 /// \brief Handle a \#line directive: C99 6.10.4.
991 /// The two acceptable forms are:
993 /// # line digit-sequence
994 /// # line digit-sequence "s-char-sequence"
996 void Preprocessor::HandleLineDirective(Token &Tok) {
997 // Read the line # and string argument. Per C99 6.10.4p5, these tokens are
1002 // Validate the number and convert it to an unsigned.
1004 if (GetLineValue(DigitTok, LineNo, diag::err_pp_line_requires_integer,*this))
1008 Diag(DigitTok, diag::ext_pp_line_zero);
1010 // Enforce C99 6.10.4p3: "The digit sequence shall not specify ... a
1011 // number greater than 2147483647". C90 requires that the line # be <= 32767.
1012 unsigned LineLimit = 32768U;
1013 if (LangOpts.C99 || LangOpts.CPlusPlus11)
1014 LineLimit = 2147483648U;
1015 if (LineNo >= LineLimit)
1016 Diag(DigitTok, diag::ext_pp_line_too_big) << LineLimit;
1017 else if (LangOpts.CPlusPlus11 && LineNo >= 32768U)
1018 Diag(DigitTok, diag::warn_cxx98_compat_pp_line_too_big);
1020 int FilenameID = -1;
1024 // If the StrTok is "eod", then it wasn't present. Otherwise, it must be a
1025 // string followed by eod.
1026 if (StrTok.is(tok::eod))
1028 else if (StrTok.isNot(tok::string_literal)) {
1029 Diag(StrTok, diag::err_pp_line_invalid_filename);
1030 return DiscardUntilEndOfDirective();
1031 } else if (StrTok.hasUDSuffix()) {
1032 Diag(StrTok, diag::err_invalid_string_udl);
1033 return DiscardUntilEndOfDirective();
1035 // Parse and validate the string, converting it into a unique ID.
1036 StringLiteralParser Literal(StrTok, *this);
1037 assert(Literal.isAscii() && "Didn't allow wide strings in");
1038 if (Literal.hadError)
1039 return DiscardUntilEndOfDirective();
1040 if (Literal.Pascal) {
1041 Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
1042 return DiscardUntilEndOfDirective();
1044 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString());
1046 // Verify that there is nothing after the string, other than EOD. Because
1047 // of C99 6.10.4p5, macros that expand to empty tokens are ok.
1048 CheckEndOfDirective("line", true);
1051 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID);
1054 Callbacks->FileChanged(CurPPLexer->getSourceLocation(),
1055 PPCallbacks::RenameFile,
1059 /// ReadLineMarkerFlags - Parse and validate any flags at the end of a GNU line
1060 /// marker directive.
1061 static bool ReadLineMarkerFlags(bool &IsFileEntry, bool &IsFileExit,
1062 bool &IsSystemHeader, bool &IsExternCHeader,
1067 if (FlagTok.is(tok::eod)) return false;
1068 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP))
1075 if (FlagTok.is(tok::eod)) return false;
1076 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP))
1078 } else if (FlagVal == 2) {
1081 SourceManager &SM = PP.getSourceManager();
1082 // If we are leaving the current presumed file, check to make sure the
1083 // presumed include stack isn't empty!
1085 SM.getDecomposedExpansionLoc(FlagTok.getLocation()).first;
1086 PresumedLoc PLoc = SM.getPresumedLoc(FlagTok.getLocation());
1087 if (PLoc.isInvalid())
1090 // If there is no include loc (main file) or if the include loc is in a
1091 // different physical file, then we aren't in a "1" line marker flag region.
1092 SourceLocation IncLoc = PLoc.getIncludeLoc();
1093 if (IncLoc.isInvalid() ||
1094 SM.getDecomposedExpansionLoc(IncLoc).first != CurFileID) {
1095 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_pop);
1096 PP.DiscardUntilEndOfDirective();
1101 if (FlagTok.is(tok::eod)) return false;
1102 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP))
1106 // We must have 3 if there are still flags.
1108 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
1109 PP.DiscardUntilEndOfDirective();
1113 IsSystemHeader = true;
1116 if (FlagTok.is(tok::eod)) return false;
1117 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP))
1120 // We must have 4 if there is yet another flag.
1122 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
1123 PP.DiscardUntilEndOfDirective();
1127 IsExternCHeader = true;
1130 if (FlagTok.is(tok::eod)) return false;
1132 // There are no more valid flags here.
1133 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
1134 PP.DiscardUntilEndOfDirective();
1138 /// HandleDigitDirective - Handle a GNU line marker directive, whose syntax is
1139 /// one of the following forms:
1142 /// # 42 "file" ('1' | '2')?
1143 /// # 42 "file" ('1' | '2')? '3' '4'?
1145 void Preprocessor::HandleDigitDirective(Token &DigitTok) {
1146 // Validate the number and convert it to an unsigned. GNU does not have a
1147 // line # limit other than it fit in 32-bits.
1149 if (GetLineValue(DigitTok, LineNo, diag::err_pp_linemarker_requires_integer,
1156 bool IsFileEntry = false, IsFileExit = false;
1157 bool IsSystemHeader = false, IsExternCHeader = false;
1158 int FilenameID = -1;
1160 // If the StrTok is "eod", then it wasn't present. Otherwise, it must be a
1161 // string followed by eod.
1162 if (StrTok.is(tok::eod))
1164 else if (StrTok.isNot(tok::string_literal)) {
1165 Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
1166 return DiscardUntilEndOfDirective();
1167 } else if (StrTok.hasUDSuffix()) {
1168 Diag(StrTok, diag::err_invalid_string_udl);
1169 return DiscardUntilEndOfDirective();
1171 // Parse and validate the string, converting it into a unique ID.
1172 StringLiteralParser Literal(StrTok, *this);
1173 assert(Literal.isAscii() && "Didn't allow wide strings in");
1174 if (Literal.hadError)
1175 return DiscardUntilEndOfDirective();
1176 if (Literal.Pascal) {
1177 Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
1178 return DiscardUntilEndOfDirective();
1180 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString());
1182 // If a filename was present, read any flags that are present.
1183 if (ReadLineMarkerFlags(IsFileEntry, IsFileExit,
1184 IsSystemHeader, IsExternCHeader, *this))
1188 // Create a line note with this information.
1189 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID,
1190 IsFileEntry, IsFileExit,
1191 IsSystemHeader, IsExternCHeader);
1193 // If the preprocessor has callbacks installed, notify them of the #line
1194 // change. This is used so that the line marker comes out in -E mode for
1197 PPCallbacks::FileChangeReason Reason = PPCallbacks::RenameFile;
1199 Reason = PPCallbacks::EnterFile;
1200 else if (IsFileExit)
1201 Reason = PPCallbacks::ExitFile;
1202 SrcMgr::CharacteristicKind FileKind = SrcMgr::C_User;
1203 if (IsExternCHeader)
1204 FileKind = SrcMgr::C_ExternCSystem;
1205 else if (IsSystemHeader)
1206 FileKind = SrcMgr::C_System;
1208 Callbacks->FileChanged(CurPPLexer->getSourceLocation(), Reason, FileKind);
1213 /// HandleUserDiagnosticDirective - Handle a #warning or #error directive.
1215 void Preprocessor::HandleUserDiagnosticDirective(Token &Tok,
1217 // PTH doesn't emit #warning or #error directives.
1219 return CurPTHLexer->DiscardToEndOfLine();
1221 // Read the rest of the line raw. We do this because we don't want macros
1222 // to be expanded and we don't require that the tokens be valid preprocessing
1223 // tokens. For example, this is allowed: "#warning ` 'foo". GCC does
1224 // collapse multiple consequtive white space between tokens, but this isn't
1225 // specified by the standard.
1226 SmallString<128> Message;
1227 CurLexer->ReadToEndOfLine(&Message);
1229 // Find the first non-whitespace character, so that we can make the
1230 // diagnostic more succinct.
1231 StringRef Msg = StringRef(Message).ltrim(" ");
1234 Diag(Tok, diag::pp_hash_warning) << Msg;
1236 Diag(Tok, diag::err_pp_hash_error) << Msg;
1239 /// HandleIdentSCCSDirective - Handle a #ident/#sccs directive.
1241 void Preprocessor::HandleIdentSCCSDirective(Token &Tok) {
1242 // Yes, this directive is an extension.
1243 Diag(Tok, diag::ext_pp_ident_directive);
1245 // Read the string argument.
1249 // If the token kind isn't a string, it's a malformed directive.
1250 if (StrTok.isNot(tok::string_literal) &&
1251 StrTok.isNot(tok::wide_string_literal)) {
1252 Diag(StrTok, diag::err_pp_malformed_ident);
1253 if (StrTok.isNot(tok::eod))
1254 DiscardUntilEndOfDirective();
1258 if (StrTok.hasUDSuffix()) {
1259 Diag(StrTok, diag::err_invalid_string_udl);
1260 return DiscardUntilEndOfDirective();
1263 // Verify that there is nothing after the string, other than EOD.
1264 CheckEndOfDirective("ident");
1267 bool Invalid = false;
1268 std::string Str = getSpelling(StrTok, &Invalid);
1270 Callbacks->Ident(Tok.getLocation(), Str);
1274 /// \brief Handle a #public directive.
1275 void Preprocessor::HandleMacroPublicDirective(Token &Tok) {
1277 ReadMacroName(MacroNameTok, MU_Undef);
1279 // Error reading macro name? If so, diagnostic already issued.
1280 if (MacroNameTok.is(tok::eod))
1283 // Check to see if this is the last token on the #__public_macro line.
1284 CheckEndOfDirective("__public_macro");
1286 IdentifierInfo *II = MacroNameTok.getIdentifierInfo();
1287 // Okay, we finally have a valid identifier to undef.
1288 MacroDirective *MD = getLocalMacroDirective(II);
1290 // If the macro is not defined, this is an error.
1292 Diag(MacroNameTok, diag::err_pp_visibility_non_macro) << II;
1296 // Note that this macro has now been exported.
1297 appendMacroDirective(II, AllocateVisibilityMacroDirective(
1298 MacroNameTok.getLocation(), /*IsPublic=*/true));
1301 /// \brief Handle a #private directive.
1302 void Preprocessor::HandleMacroPrivateDirective(Token &Tok) {
1304 ReadMacroName(MacroNameTok, MU_Undef);
1306 // Error reading macro name? If so, diagnostic already issued.
1307 if (MacroNameTok.is(tok::eod))
1310 // Check to see if this is the last token on the #__private_macro line.
1311 CheckEndOfDirective("__private_macro");
1313 IdentifierInfo *II = MacroNameTok.getIdentifierInfo();
1314 // Okay, we finally have a valid identifier to undef.
1315 MacroDirective *MD = getLocalMacroDirective(II);
1317 // If the macro is not defined, this is an error.
1319 Diag(MacroNameTok, diag::err_pp_visibility_non_macro) << II;
1323 // Note that this macro has now been marked private.
1324 appendMacroDirective(II, AllocateVisibilityMacroDirective(
1325 MacroNameTok.getLocation(), /*IsPublic=*/false));
1328 //===----------------------------------------------------------------------===//
1329 // Preprocessor Include Directive Handling.
1330 //===----------------------------------------------------------------------===//
1332 /// GetIncludeFilenameSpelling - Turn the specified lexer token into a fully
1333 /// checked and spelled filename, e.g. as an operand of \#include. This returns
1334 /// true if the input filename was in <>'s or false if it were in ""'s. The
1335 /// caller is expected to provide a buffer that is large enough to hold the
1336 /// spelling of the filename, but is also expected to handle the case when
1337 /// this method decides to use a different buffer.
1338 bool Preprocessor::GetIncludeFilenameSpelling(SourceLocation Loc,
1339 StringRef &Buffer) {
1340 // Get the text form of the filename.
1341 assert(!Buffer.empty() && "Can't have tokens with empty spellings!");
1343 // Make sure the filename is <x> or "x".
1345 if (Buffer[0] == '<') {
1346 if (Buffer.back() != '>') {
1347 Diag(Loc, diag::err_pp_expects_filename);
1348 Buffer = StringRef();
1352 } else if (Buffer[0] == '"') {
1353 if (Buffer.back() != '"') {
1354 Diag(Loc, diag::err_pp_expects_filename);
1355 Buffer = StringRef();
1360 Diag(Loc, diag::err_pp_expects_filename);
1361 Buffer = StringRef();
1365 // Diagnose #include "" as invalid.
1366 if (Buffer.size() <= 2) {
1367 Diag(Loc, diag::err_pp_empty_filename);
1368 Buffer = StringRef();
1372 // Skip the brackets.
1373 Buffer = Buffer.substr(1, Buffer.size()-2);
1377 // \brief Handle cases where the \#include name is expanded from a macro
1378 // as multiple tokens, which need to be glued together.
1380 // This occurs for code like:
1382 // \#define FOO <a/b.h>
1385 // because in this case, "<a/b.h>" is returned as 7 tokens, not one.
1387 // This code concatenates and consumes tokens up to the '>' token. It returns
1388 // false if the > was found, otherwise it returns true if it finds and consumes
1390 bool Preprocessor::ConcatenateIncludeName(SmallString<128> &FilenameBuffer,
1391 SourceLocation &End) {
1395 while (CurTok.isNot(tok::eod)) {
1396 End = CurTok.getLocation();
1398 // FIXME: Provide code completion for #includes.
1399 if (CurTok.is(tok::code_completion)) {
1400 setCodeCompletionReached();
1405 // Append the spelling of this token to the buffer. If there was a space
1406 // before it, add it now.
1407 if (CurTok.hasLeadingSpace())
1408 FilenameBuffer.push_back(' ');
1410 // Get the spelling of the token, directly into FilenameBuffer if possible.
1411 unsigned PreAppendSize = FilenameBuffer.size();
1412 FilenameBuffer.resize(PreAppendSize+CurTok.getLength());
1414 const char *BufPtr = &FilenameBuffer[PreAppendSize];
1415 unsigned ActualLen = getSpelling(CurTok, BufPtr);
1417 // If the token was spelled somewhere else, copy it into FilenameBuffer.
1418 if (BufPtr != &FilenameBuffer[PreAppendSize])
1419 memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen);
1421 // Resize FilenameBuffer to the correct size.
1422 if (CurTok.getLength() != ActualLen)
1423 FilenameBuffer.resize(PreAppendSize+ActualLen);
1425 // If we found the '>' marker, return success.
1426 if (CurTok.is(tok::greater))
1432 // If we hit the eod marker, emit an error and return true so that the caller
1433 // knows the EOD has been read.
1434 Diag(CurTok.getLocation(), diag::err_pp_expects_filename);
1438 /// \brief Push a token onto the token stream containing an annotation.
1439 static void EnterAnnotationToken(Preprocessor &PP,
1440 SourceLocation Begin, SourceLocation End,
1441 tok::TokenKind Kind, void *AnnotationVal) {
1442 // FIXME: Produce this as the current token directly, rather than
1443 // allocating a new token for it.
1444 Token *Tok = new Token[1];
1445 Tok[0].startToken();
1446 Tok[0].setKind(Kind);
1447 Tok[0].setLocation(Begin);
1448 Tok[0].setAnnotationEndLoc(End);
1449 Tok[0].setAnnotationValue(AnnotationVal);
1450 PP.EnterTokenStream(Tok, 1, true, true);
1453 /// \brief Produce a diagnostic informing the user that a #include or similar
1454 /// was implicitly treated as a module import.
1455 static void diagnoseAutoModuleImport(
1456 Preprocessor &PP, SourceLocation HashLoc, Token &IncludeTok,
1457 ArrayRef<std::pair<IdentifierInfo *, SourceLocation>> Path,
1458 SourceLocation PathEnd) {
1459 assert(PP.getLangOpts().ObjC2 && "no import syntax available");
1461 SmallString<128> PathString;
1462 for (unsigned I = 0, N = Path.size(); I != N; ++I) {
1465 PathString += Path[I].first->getName();
1467 int IncludeKind = 0;
1469 switch (IncludeTok.getIdentifierInfo()->getPPKeywordID()) {
1470 case tok::pp_include:
1474 case tok::pp_import:
1478 case tok::pp_include_next:
1482 case tok::pp___include_macros:
1487 llvm_unreachable("unknown include directive kind");
1490 CharSourceRange ReplaceRange(SourceRange(HashLoc, PathEnd),
1491 /*IsTokenRange=*/false);
1492 PP.Diag(HashLoc, diag::warn_auto_module_import)
1493 << IncludeKind << PathString
1494 << FixItHint::CreateReplacement(ReplaceRange,
1495 ("@import " + PathString + ";").str());
1498 /// HandleIncludeDirective - The "\#include" tokens have just been read, read
1499 /// the file to be included from the lexer, then include it! This is a common
1500 /// routine with functionality shared between \#include, \#include_next and
1501 /// \#import. LookupFrom is set when this is a \#include_next directive, it
1502 /// specifies the file to start searching from.
1503 void Preprocessor::HandleIncludeDirective(SourceLocation HashLoc,
1505 const DirectoryLookup *LookupFrom,
1506 const FileEntry *LookupFromFile,
1510 CurPPLexer->LexIncludeFilename(FilenameTok);
1512 // Reserve a buffer to get the spelling.
1513 SmallString<128> FilenameBuffer;
1516 SourceLocation CharEnd; // the end of this directive, in characters
1518 switch (FilenameTok.getKind()) {
1520 // If the token kind is EOD, the error has already been diagnosed.
1523 case tok::angle_string_literal:
1524 case tok::string_literal:
1525 Filename = getSpelling(FilenameTok, FilenameBuffer);
1526 End = FilenameTok.getLocation();
1527 CharEnd = End.getLocWithOffset(FilenameTok.getLength());
1531 // This could be a <foo/bar.h> file coming from a macro expansion. In this
1532 // case, glue the tokens together into FilenameBuffer and interpret those.
1533 FilenameBuffer.push_back('<');
1534 if (ConcatenateIncludeName(FilenameBuffer, End))
1535 return; // Found <eod> but no ">"? Diagnostic already emitted.
1536 Filename = FilenameBuffer;
1537 CharEnd = End.getLocWithOffset(1);
1540 Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
1541 DiscardUntilEndOfDirective();
1545 CharSourceRange FilenameRange
1546 = CharSourceRange::getCharRange(FilenameTok.getLocation(), CharEnd);
1547 StringRef OriginalFilename = Filename;
1549 GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename);
1550 // If GetIncludeFilenameSpelling set the start ptr to null, there was an
1552 if (Filename.empty()) {
1553 DiscardUntilEndOfDirective();
1557 // Verify that there is nothing after the filename, other than EOD. Note that
1558 // we allow macros that expand to nothing after the filename, because this
1559 // falls into the category of "#include pp-tokens new-line" specified in
1561 CheckEndOfDirective(IncludeTok.getIdentifierInfo()->getNameStart(), true);
1563 // Check that we don't have infinite #include recursion.
1564 if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1) {
1565 Diag(FilenameTok, diag::err_pp_include_too_deep);
1569 // Complain about attempts to #include files in an audit pragma.
1570 if (PragmaARCCFCodeAuditedLoc.isValid()) {
1571 Diag(HashLoc, diag::err_pp_include_in_arc_cf_code_audited);
1572 Diag(PragmaARCCFCodeAuditedLoc, diag::note_pragma_entered_here);
1574 // Immediately leave the pragma.
1575 PragmaARCCFCodeAuditedLoc = SourceLocation();
1578 // Complain about attempts to #include files in an assume-nonnull pragma.
1579 if (PragmaAssumeNonNullLoc.isValid()) {
1580 Diag(HashLoc, diag::err_pp_include_in_assume_nonnull);
1581 Diag(PragmaAssumeNonNullLoc, diag::note_pragma_entered_here);
1583 // Immediately leave the pragma.
1584 PragmaAssumeNonNullLoc = SourceLocation();
1587 if (HeaderInfo.HasIncludeAliasMap()) {
1588 // Map the filename with the brackets still attached. If the name doesn't
1589 // map to anything, fall back on the filename we've already gotten the
1591 StringRef NewName = HeaderInfo.MapHeaderToIncludeAlias(OriginalFilename);
1592 if (!NewName.empty())
1596 // Search include directories.
1597 const DirectoryLookup *CurDir;
1598 SmallString<1024> SearchPath;
1599 SmallString<1024> RelativePath;
1600 // We get the raw path only if we have 'Callbacks' to which we later pass
1602 ModuleMap::KnownHeader SuggestedModule;
1603 SourceLocation FilenameLoc = FilenameTok.getLocation();
1604 SmallString<128> NormalizedPath;
1605 if (LangOpts.MSVCCompat) {
1606 NormalizedPath = Filename.str();
1607 #ifndef LLVM_ON_WIN32
1608 llvm::sys::path::native(NormalizedPath);
1611 const FileEntry *File = LookupFile(
1612 FilenameLoc, LangOpts.MSVCCompat ? NormalizedPath.c_str() : Filename,
1613 isAngled, LookupFrom, LookupFromFile, CurDir,
1614 Callbacks ? &SearchPath : nullptr, Callbacks ? &RelativePath : nullptr,
1619 // Give the clients a chance to recover.
1620 SmallString<128> RecoveryPath;
1621 if (Callbacks->FileNotFound(Filename, RecoveryPath)) {
1622 if (const DirectoryEntry *DE = FileMgr.getDirectory(RecoveryPath)) {
1623 // Add the recovery path to the list of search paths.
1624 DirectoryLookup DL(DE, SrcMgr::C_User, false);
1625 HeaderInfo.AddSearchPath(DL, isAngled);
1627 // Try the lookup again, skipping the cache.
1630 LangOpts.MSVCCompat ? NormalizedPath.c_str() : Filename, isAngled,
1631 LookupFrom, LookupFromFile, CurDir, nullptr, nullptr,
1632 &SuggestedModule, /*SkipCache*/ true);
1637 if (!SuppressIncludeNotFoundError) {
1638 // If the file could not be located and it was included via angle
1639 // brackets, we can attempt a lookup as though it were a quoted path to
1640 // provide the user with a possible fixit.
1644 LangOpts.MSVCCompat ? NormalizedPath.c_str() : Filename, false,
1645 LookupFrom, LookupFromFile, CurDir,
1646 Callbacks ? &SearchPath : nullptr,
1647 Callbacks ? &RelativePath : nullptr,
1650 SourceRange Range(FilenameTok.getLocation(), CharEnd);
1651 Diag(FilenameTok, diag::err_pp_file_not_found_not_fatal) <<
1653 FixItHint::CreateReplacement(Range, "\"" + Filename.str() + "\"");
1657 // If the file is still not found, just go with the vanilla diagnostic
1659 Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
1663 // Should we enter the source file? Set to false if either the source file is
1664 // known to have no effect beyond its effect on module visibility -- that is,
1665 // if it's got an include guard that is already defined or is a modular header
1666 // we've imported or already built.
1667 bool ShouldEnter = true;
1669 // Determine whether we should try to import the module for this #include, if
1670 // there is one. Don't do so if precompiled module support is disabled or we
1671 // are processing this module textually (because we're building the module).
1672 if (File && SuggestedModule && getLangOpts().Modules &&
1673 SuggestedModule.getModule()->getTopLevelModuleName() !=
1674 getLangOpts().CurrentModule &&
1675 SuggestedModule.getModule()->getTopLevelModuleName() !=
1676 getLangOpts().ImplementationOfModule) {
1677 // Compute the module access path corresponding to this module.
1678 // FIXME: Should we have a second loadModule() overload to avoid this
1679 // extra lookup step?
1680 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1681 for (Module *Mod = SuggestedModule.getModule(); Mod; Mod = Mod->Parent)
1682 Path.push_back(std::make_pair(getIdentifierInfo(Mod->Name),
1683 FilenameTok.getLocation()));
1684 std::reverse(Path.begin(), Path.end());
1686 // Warn that we're replacing the include/import with a module import.
1687 // We only do this in Objective-C, where we have a module-import syntax.
1688 if (getLangOpts().ObjC2)
1689 diagnoseAutoModuleImport(*this, HashLoc, IncludeTok, Path, CharEnd);
1691 // Load the module to import its macros. We'll make the declarations
1692 // visible when the parser gets here.
1693 // FIXME: Pass SuggestedModule in here rather than converting it to a path
1694 // and making the module loader convert it back again.
1695 ModuleLoadResult Imported = TheModuleLoader.loadModule(
1696 IncludeTok.getLocation(), Path, Module::Hidden,
1697 /*IsIncludeDirective=*/true);
1698 assert((Imported == nullptr || Imported == SuggestedModule.getModule()) &&
1699 "the imported module is different than the suggested one");
1702 ShouldEnter = false;
1703 else if (Imported.isMissingExpected()) {
1704 // We failed to find a submodule that we assumed would exist (because it
1705 // was in the directory of an umbrella header, for instance), but no
1706 // actual module exists for it (because the umbrella header is
1707 // incomplete). Treat this as a textual inclusion.
1708 SuggestedModule = ModuleMap::KnownHeader();
1710 // We hit an error processing the import. Bail out.
1711 if (hadModuleLoaderFatalFailure()) {
1712 // With a fatal failure in the module loader, we abort parsing.
1713 Token &Result = IncludeTok;
1715 Result.startToken();
1716 CurLexer->FormTokenWithChars(Result, CurLexer->BufferEnd, tok::eof);
1717 CurLexer->cutOffLexing();
1719 assert(CurPTHLexer && "#include but no current lexer set!");
1720 CurPTHLexer->getEOF(Result);
1728 // Notify the callback object that we've seen an inclusion directive.
1729 Callbacks->InclusionDirective(
1730 HashLoc, IncludeTok,
1731 LangOpts.MSVCCompat ? NormalizedPath.c_str() : Filename, isAngled,
1732 FilenameRange, File, SearchPath, RelativePath,
1733 ShouldEnter ? nullptr : SuggestedModule.getModule());
1739 // The #included file will be considered to be a system header if either it is
1740 // in a system include directory, or if the #includer is a system include
1742 SrcMgr::CharacteristicKind FileCharacter =
1743 std::max(HeaderInfo.getFileDirFlavor(File),
1744 SourceMgr.getFileCharacteristic(FilenameTok.getLocation()));
1746 // FIXME: If we have a suggested module, and we've already visited this file,
1747 // don't bother entering it again. We know it has no further effect.
1749 // Ask HeaderInfo if we should enter this #include file. If not, #including
1750 // this file will have no effect.
1752 !HeaderInfo.ShouldEnterIncludeFile(*this, File, isImport)) {
1753 ShouldEnter = false;
1755 Callbacks->FileSkipped(*File, FilenameTok, FileCharacter);
1758 // If we don't need to enter the file, stop now.
1760 // If this is a module import, make it visible if needed.
1761 if (auto *M = SuggestedModule.getModule()) {
1762 makeModuleVisible(M, HashLoc);
1764 if (IncludeTok.getIdentifierInfo()->getPPKeywordID() !=
1765 tok::pp___include_macros)
1766 EnterAnnotationToken(*this, HashLoc, End, tok::annot_module_include, M);
1771 // Look up the file, create a File ID for it.
1772 SourceLocation IncludePos = End;
1773 // If the filename string was the result of macro expansions, set the include
1774 // position on the file where it will be included and after the expansions.
1775 if (IncludePos.isMacroID())
1776 IncludePos = SourceMgr.getExpansionRange(IncludePos).second;
1777 FileID FID = SourceMgr.createFileID(File, IncludePos, FileCharacter);
1778 assert(!FID.isInvalid() && "Expected valid file ID");
1780 // If all is good, enter the new file!
1781 if (EnterSourceFile(FID, CurDir, FilenameTok.getLocation()))
1784 // Determine if we're switching to building a new submodule, and which one.
1785 if (auto *M = SuggestedModule.getModule()) {
1786 assert(!CurSubmodule && "should not have marked this as a module yet");
1789 // Let the macro handling code know that any future macros are within
1790 // the new submodule.
1791 EnterSubmodule(M, HashLoc);
1793 // Let the parser know that any future declarations are within the new
1795 // FIXME: There's no point doing this if we're handling a #__include_macros
1797 EnterAnnotationToken(*this, HashLoc, End, tok::annot_module_begin, M);
1801 /// HandleIncludeNextDirective - Implements \#include_next.
1803 void Preprocessor::HandleIncludeNextDirective(SourceLocation HashLoc,
1804 Token &IncludeNextTok) {
1805 Diag(IncludeNextTok, diag::ext_pp_include_next_directive);
1807 // #include_next is like #include, except that we start searching after
1808 // the current found directory. If we can't do this, issue a
1810 const DirectoryLookup *Lookup = CurDirLookup;
1811 const FileEntry *LookupFromFile = nullptr;
1812 if (isInPrimaryFile()) {
1814 Diag(IncludeNextTok, diag::pp_include_next_in_primary);
1815 } else if (CurSubmodule) {
1816 // Start looking up in the directory *after* the one in which the current
1817 // file would be found, if any.
1818 assert(CurPPLexer && "#include_next directive in macro?");
1819 LookupFromFile = CurPPLexer->getFileEntry();
1821 } else if (!Lookup) {
1822 Diag(IncludeNextTok, diag::pp_include_next_absolute_path);
1824 // Start looking up in the next directory.
1828 return HandleIncludeDirective(HashLoc, IncludeNextTok, Lookup,
1832 /// HandleMicrosoftImportDirective - Implements \#import for Microsoft Mode
1833 void Preprocessor::HandleMicrosoftImportDirective(Token &Tok) {
1834 // The Microsoft #import directive takes a type library and generates header
1835 // files from it, and includes those. This is beyond the scope of what clang
1836 // does, so we ignore it and error out. However, #import can optionally have
1837 // trailing attributes that span multiple lines. We're going to eat those
1838 // so we can continue processing from there.
1839 Diag(Tok, diag::err_pp_import_directive_ms );
1841 // Read tokens until we get to the end of the directive. Note that the
1842 // directive can be split over multiple lines using the backslash character.
1843 DiscardUntilEndOfDirective();
1846 /// HandleImportDirective - Implements \#import.
1848 void Preprocessor::HandleImportDirective(SourceLocation HashLoc,
1850 if (!LangOpts.ObjC1) { // #import is standard for ObjC.
1851 if (LangOpts.MSVCCompat)
1852 return HandleMicrosoftImportDirective(ImportTok);
1853 Diag(ImportTok, diag::ext_pp_import_directive);
1855 return HandleIncludeDirective(HashLoc, ImportTok, nullptr, nullptr, true);
1858 /// HandleIncludeMacrosDirective - The -imacros command line option turns into a
1859 /// pseudo directive in the predefines buffer. This handles it by sucking all
1860 /// tokens through the preprocessor and discarding them (only keeping the side
1861 /// effects on the preprocessor).
1862 void Preprocessor::HandleIncludeMacrosDirective(SourceLocation HashLoc,
1863 Token &IncludeMacrosTok) {
1864 // This directive should only occur in the predefines buffer. If not, emit an
1865 // error and reject it.
1866 SourceLocation Loc = IncludeMacrosTok.getLocation();
1867 if (strcmp(SourceMgr.getBufferName(Loc), "<built-in>") != 0) {
1868 Diag(IncludeMacrosTok.getLocation(),
1869 diag::pp_include_macros_out_of_predefines);
1870 DiscardUntilEndOfDirective();
1874 // Treat this as a normal #include for checking purposes. If this is
1875 // successful, it will push a new lexer onto the include stack.
1876 HandleIncludeDirective(HashLoc, IncludeMacrosTok);
1881 assert(TmpTok.isNot(tok::eof) && "Didn't find end of -imacros!");
1882 } while (TmpTok.isNot(tok::hashhash));
1885 //===----------------------------------------------------------------------===//
1886 // Preprocessor Macro Directive Handling.
1887 //===----------------------------------------------------------------------===//
1889 /// ReadMacroDefinitionArgList - The ( starting an argument list of a macro
1890 /// definition has just been read. Lex the rest of the arguments and the
1891 /// closing ), updating MI with what we learn. Return true if an error occurs
1892 /// parsing the arg list.
1893 bool Preprocessor::ReadMacroDefinitionArgList(MacroInfo *MI, Token &Tok) {
1894 SmallVector<IdentifierInfo*, 32> Arguments;
1897 LexUnexpandedToken(Tok);
1898 switch (Tok.getKind()) {
1900 // Found the end of the argument list.
1901 if (Arguments.empty()) // #define FOO()
1903 // Otherwise we have #define FOO(A,)
1904 Diag(Tok, diag::err_pp_expected_ident_in_arg_list);
1906 case tok::ellipsis: // #define X(... -> C99 varargs
1908 Diag(Tok, LangOpts.CPlusPlus11 ?
1909 diag::warn_cxx98_compat_variadic_macro :
1910 diag::ext_variadic_macro);
1912 // OpenCL v1.2 s6.9.e: variadic macros are not supported.
1913 if (LangOpts.OpenCL) {
1914 Diag(Tok, diag::err_pp_opencl_variadic_macros);
1918 // Lex the token after the identifier.
1919 LexUnexpandedToken(Tok);
1920 if (Tok.isNot(tok::r_paren)) {
1921 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
1924 // Add the __VA_ARGS__ identifier as an argument.
1925 Arguments.push_back(Ident__VA_ARGS__);
1926 MI->setIsC99Varargs();
1927 MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
1929 case tok::eod: // #define X(
1930 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
1933 // Handle keywords and identifiers here to accept things like
1934 // #define Foo(for) for.
1935 IdentifierInfo *II = Tok.getIdentifierInfo();
1938 Diag(Tok, diag::err_pp_invalid_tok_in_arg_list);
1942 // If this is already used as an argument, it is used multiple times (e.g.
1944 if (std::find(Arguments.begin(), Arguments.end(), II) !=
1945 Arguments.end()) { // C99 6.10.3p6
1946 Diag(Tok, diag::err_pp_duplicate_name_in_arg_list) << II;
1950 // Add the argument to the macro info.
1951 Arguments.push_back(II);
1953 // Lex the token after the identifier.
1954 LexUnexpandedToken(Tok);
1956 switch (Tok.getKind()) {
1957 default: // #define X(A B
1958 Diag(Tok, diag::err_pp_expected_comma_in_arg_list);
1960 case tok::r_paren: // #define X(A)
1961 MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
1963 case tok::comma: // #define X(A,
1965 case tok::ellipsis: // #define X(A... -> GCC extension
1966 // Diagnose extension.
1967 Diag(Tok, diag::ext_named_variadic_macro);
1969 // Lex the token after the identifier.
1970 LexUnexpandedToken(Tok);
1971 if (Tok.isNot(tok::r_paren)) {
1972 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
1976 MI->setIsGNUVarargs();
1977 MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
1984 static bool isConfigurationPattern(Token &MacroName, MacroInfo *MI,
1985 const LangOptions &LOptions) {
1986 if (MI->getNumTokens() == 1) {
1987 const Token &Value = MI->getReplacementToken(0);
1989 // Macro that is identity, like '#define inline inline' is a valid pattern.
1990 if (MacroName.getKind() == Value.getKind())
1993 // Macro that maps a keyword to the same keyword decorated with leading/
1994 // trailing underscores is a valid pattern:
1995 // #define inline __inline
1996 // #define inline __inline__
1997 // #define inline _inline (in MS compatibility mode)
1998 StringRef MacroText = MacroName.getIdentifierInfo()->getName();
1999 if (IdentifierInfo *II = Value.getIdentifierInfo()) {
2000 if (!II->isKeyword(LOptions))
2002 StringRef ValueText = II->getName();
2003 StringRef TrimmedValue = ValueText;
2004 if (!ValueText.startswith("__")) {
2005 if (ValueText.startswith("_"))
2006 TrimmedValue = TrimmedValue.drop_front(1);
2010 TrimmedValue = TrimmedValue.drop_front(2);
2011 if (TrimmedValue.endswith("__"))
2012 TrimmedValue = TrimmedValue.drop_back(2);
2014 return TrimmedValue.equals(MacroText);
2021 if (MacroName.isOneOf(tok::kw_extern, tok::kw_inline, tok::kw_static,
2023 MI->getNumTokens() == 0) {
2030 /// HandleDefineDirective - Implements \#define. This consumes the entire macro
2031 /// line then lets the caller lex the next real token.
2032 void Preprocessor::HandleDefineDirective(Token &DefineTok,
2033 bool ImmediatelyAfterHeaderGuard) {
2037 bool MacroShadowsKeyword;
2038 ReadMacroName(MacroNameTok, MU_Define, &MacroShadowsKeyword);
2040 // Error reading macro name? If so, diagnostic already issued.
2041 if (MacroNameTok.is(tok::eod))
2044 Token LastTok = MacroNameTok;
2046 // If we are supposed to keep comments in #defines, reenable comment saving
2048 if (CurLexer) CurLexer->SetCommentRetentionState(KeepMacroComments);
2050 // Create the new macro.
2051 MacroInfo *MI = AllocateMacroInfo(MacroNameTok.getLocation());
2054 LexUnexpandedToken(Tok);
2056 // If this is a function-like macro definition, parse the argument list,
2057 // marking each of the identifiers as being used as macro arguments. Also,
2058 // check other constraints on the first token of the macro body.
2059 if (Tok.is(tok::eod)) {
2060 if (ImmediatelyAfterHeaderGuard) {
2061 // Save this macro information since it may part of a header guard.
2062 CurPPLexer->MIOpt.SetDefinedMacro(MacroNameTok.getIdentifierInfo(),
2063 MacroNameTok.getLocation());
2065 // If there is no body to this macro, we have no special handling here.
2066 } else if (Tok.hasLeadingSpace()) {
2067 // This is a normal token with leading space. Clear the leading space
2068 // marker on the first token to get proper expansion.
2069 Tok.clearFlag(Token::LeadingSpace);
2070 } else if (Tok.is(tok::l_paren)) {
2071 // This is a function-like macro definition. Read the argument list.
2072 MI->setIsFunctionLike();
2073 if (ReadMacroDefinitionArgList(MI, LastTok)) {
2074 // Throw away the rest of the line.
2075 if (CurPPLexer->ParsingPreprocessorDirective)
2076 DiscardUntilEndOfDirective();
2080 // If this is a definition of a variadic C99 function-like macro, not using
2081 // the GNU named varargs extension, enabled __VA_ARGS__.
2083 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro.
2084 // This gets unpoisoned where it is allowed.
2085 assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!");
2086 if (MI->isC99Varargs())
2087 Ident__VA_ARGS__->setIsPoisoned(false);
2089 // Read the first token after the arg list for down below.
2090 LexUnexpandedToken(Tok);
2091 } else if (LangOpts.C99 || LangOpts.CPlusPlus11) {
2092 // C99 requires whitespace between the macro definition and the body. Emit
2093 // a diagnostic for something like "#define X+".
2094 Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name);
2096 // C90 6.8 TC1 says: "In the definition of an object-like macro, if the
2097 // first character of a replacement list is not a character required by
2098 // subclause 5.2.1, then there shall be white-space separation between the
2099 // identifier and the replacement list.". 5.2.1 lists this set:
2100 // "A-Za-z0-9!"#%&'()*+,_./:;<=>?[\]^_{|}~" as well as whitespace, which
2101 // is irrelevant here.
2102 bool isInvalid = false;
2103 if (Tok.is(tok::at)) // @ is not in the list above.
2105 else if (Tok.is(tok::unknown)) {
2106 // If we have an unknown token, it is something strange like "`". Since
2107 // all of valid characters would have lexed into a single character
2108 // token of some sort, we know this is not a valid case.
2112 Diag(Tok, diag::ext_missing_whitespace_after_macro_name);
2114 Diag(Tok, diag::warn_missing_whitespace_after_macro_name);
2117 if (!Tok.is(tok::eod))
2120 // Read the rest of the macro body.
2121 if (MI->isObjectLike()) {
2122 // Object-like macros are very simple, just read their body.
2123 while (Tok.isNot(tok::eod)) {
2125 MI->AddTokenToBody(Tok);
2126 // Get the next token of the macro.
2127 LexUnexpandedToken(Tok);
2131 // Otherwise, read the body of a function-like macro. While we are at it,
2132 // check C99 6.10.3.2p1: ensure that # operators are followed by macro
2133 // parameters in function-like macro expansions.
2134 while (Tok.isNot(tok::eod)) {
2137 if (Tok.isNot(tok::hash) && Tok.isNot(tok::hashhash)) {
2138 MI->AddTokenToBody(Tok);
2140 // Get the next token of the macro.
2141 LexUnexpandedToken(Tok);
2145 // If we're in -traditional mode, then we should ignore stringification
2146 // and token pasting. Mark the tokens as unknown so as not to confuse
2148 if (getLangOpts().TraditionalCPP) {
2149 Tok.setKind(tok::unknown);
2150 MI->AddTokenToBody(Tok);
2152 // Get the next token of the macro.
2153 LexUnexpandedToken(Tok);
2157 if (Tok.is(tok::hashhash)) {
2159 // If we see token pasting, check if it looks like the gcc comma
2160 // pasting extension. We'll use this information to suppress
2161 // diagnostics later on.
2163 // Get the next token of the macro.
2164 LexUnexpandedToken(Tok);
2166 if (Tok.is(tok::eod)) {
2167 MI->AddTokenToBody(LastTok);
2171 unsigned NumTokens = MI->getNumTokens();
2172 if (NumTokens && Tok.getIdentifierInfo() == Ident__VA_ARGS__ &&
2173 MI->getReplacementToken(NumTokens-1).is(tok::comma))
2174 MI->setHasCommaPasting();
2176 // Things look ok, add the '##' token to the macro.
2177 MI->AddTokenToBody(LastTok);
2181 // Get the next token of the macro.
2182 LexUnexpandedToken(Tok);
2184 // Check for a valid macro arg identifier.
2185 if (Tok.getIdentifierInfo() == nullptr ||
2186 MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) {
2188 // If this is assembler-with-cpp mode, we accept random gibberish after
2189 // the '#' because '#' is often a comment character. However, change
2190 // the kind of the token to tok::unknown so that the preprocessor isn't
2192 if (getLangOpts().AsmPreprocessor && Tok.isNot(tok::eod)) {
2193 LastTok.setKind(tok::unknown);
2194 MI->AddTokenToBody(LastTok);
2197 Diag(Tok, diag::err_pp_stringize_not_parameter);
2199 // Disable __VA_ARGS__ again.
2200 Ident__VA_ARGS__->setIsPoisoned(true);
2205 // Things look ok, add the '#' and param name tokens to the macro.
2206 MI->AddTokenToBody(LastTok);
2207 MI->AddTokenToBody(Tok);
2210 // Get the next token of the macro.
2211 LexUnexpandedToken(Tok);
2215 if (MacroShadowsKeyword &&
2216 !isConfigurationPattern(MacroNameTok, MI, getLangOpts())) {
2217 Diag(MacroNameTok, diag::warn_pp_macro_hides_keyword);
2220 // Disable __VA_ARGS__ again.
2221 Ident__VA_ARGS__->setIsPoisoned(true);
2223 // Check that there is no paste (##) operator at the beginning or end of the
2224 // replacement list.
2225 unsigned NumTokens = MI->getNumTokens();
2226 if (NumTokens != 0) {
2227 if (MI->getReplacementToken(0).is(tok::hashhash)) {
2228 Diag(MI->getReplacementToken(0), diag::err_paste_at_start);
2231 if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) {
2232 Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end);
2237 MI->setDefinitionEndLoc(LastTok.getLocation());
2239 // Finally, if this identifier already had a macro defined for it, verify that
2240 // the macro bodies are identical, and issue diagnostics if they are not.
2241 if (const MacroInfo *OtherMI=getMacroInfo(MacroNameTok.getIdentifierInfo())) {
2242 // It is very common for system headers to have tons of macro redefinitions
2243 // and for warnings to be disabled in system headers. If this is the case,
2244 // then don't bother calling MacroInfo::isIdenticalTo.
2245 if (!getDiagnostics().getSuppressSystemWarnings() ||
2246 !SourceMgr.isInSystemHeader(DefineTok.getLocation())) {
2247 if (!OtherMI->isUsed() && OtherMI->isWarnIfUnused())
2248 Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used);
2250 // Warn if defining "__LINE__" and other builtins, per C99 6.10.8/4 and
2251 // C++ [cpp.predefined]p4, but allow it as an extension.
2252 if (OtherMI->isBuiltinMacro())
2253 Diag(MacroNameTok, diag::ext_pp_redef_builtin_macro);
2254 // Macros must be identical. This means all tokens and whitespace
2255 // separation must be the same. C99 6.10.3p2.
2256 else if (!OtherMI->isAllowRedefinitionsWithoutWarning() &&
2257 !MI->isIdenticalTo(*OtherMI, *this, /*Syntactic=*/LangOpts.MicrosoftExt)) {
2258 Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef)
2259 << MacroNameTok.getIdentifierInfo();
2260 Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition);
2263 if (OtherMI->isWarnIfUnused())
2264 WarnUnusedMacroLocs.erase(OtherMI->getDefinitionLoc());
2267 DefMacroDirective *MD =
2268 appendDefMacroDirective(MacroNameTok.getIdentifierInfo(), MI);
2270 assert(!MI->isUsed());
2271 // If we need warning for not using the macro, add its location in the
2272 // warn-because-unused-macro set. If it gets used it will be removed from set.
2273 if (getSourceManager().isInMainFile(MI->getDefinitionLoc()) &&
2274 !Diags->isIgnored(diag::pp_macro_not_used, MI->getDefinitionLoc())) {
2275 MI->setIsWarnIfUnused(true);
2276 WarnUnusedMacroLocs.insert(MI->getDefinitionLoc());
2279 // If the callbacks want to know, tell them about the macro definition.
2281 Callbacks->MacroDefined(MacroNameTok, MD);
2284 /// HandleUndefDirective - Implements \#undef.
2286 void Preprocessor::HandleUndefDirective(Token &UndefTok) {
2290 ReadMacroName(MacroNameTok, MU_Undef);
2292 // Error reading macro name? If so, diagnostic already issued.
2293 if (MacroNameTok.is(tok::eod))
2296 // Check to see if this is the last token on the #undef line.
2297 CheckEndOfDirective("undef");
2299 // Okay, we have a valid identifier to undef.
2300 auto *II = MacroNameTok.getIdentifierInfo();
2301 auto MD = getMacroDefinition(II);
2303 // If the callbacks want to know, tell them about the macro #undef.
2304 // Note: no matter if the macro was defined or not.
2306 Callbacks->MacroUndefined(MacroNameTok, MD);
2308 // If the macro is not defined, this is a noop undef, just return.
2309 const MacroInfo *MI = MD.getMacroInfo();
2313 if (!MI->isUsed() && MI->isWarnIfUnused())
2314 Diag(MI->getDefinitionLoc(), diag::pp_macro_not_used);
2316 if (MI->isWarnIfUnused())
2317 WarnUnusedMacroLocs.erase(MI->getDefinitionLoc());
2319 appendMacroDirective(MacroNameTok.getIdentifierInfo(),
2320 AllocateUndefMacroDirective(MacroNameTok.getLocation()));
2324 //===----------------------------------------------------------------------===//
2325 // Preprocessor Conditional Directive Handling.
2326 //===----------------------------------------------------------------------===//
2328 /// HandleIfdefDirective - Implements the \#ifdef/\#ifndef directive. isIfndef
2329 /// is true when this is a \#ifndef directive. ReadAnyTokensBeforeDirective is
2330 /// true if any tokens have been returned or pp-directives activated before this
2331 /// \#ifndef has been lexed.
2333 void Preprocessor::HandleIfdefDirective(Token &Result, bool isIfndef,
2334 bool ReadAnyTokensBeforeDirective) {
2336 Token DirectiveTok = Result;
2339 ReadMacroName(MacroNameTok);
2341 // Error reading macro name? If so, diagnostic already issued.
2342 if (MacroNameTok.is(tok::eod)) {
2343 // Skip code until we get to #endif. This helps with recovery by not
2344 // emitting an error when the #endif is reached.
2345 SkipExcludedConditionalBlock(DirectiveTok.getLocation(),
2346 /*Foundnonskip*/false, /*FoundElse*/false);
2350 // Check to see if this is the last token on the #if[n]def line.
2351 CheckEndOfDirective(isIfndef ? "ifndef" : "ifdef");
2353 IdentifierInfo *MII = MacroNameTok.getIdentifierInfo();
2354 auto MD = getMacroDefinition(MII);
2355 MacroInfo *MI = MD.getMacroInfo();
2357 if (CurPPLexer->getConditionalStackDepth() == 0) {
2358 // If the start of a top-level #ifdef and if the macro is not defined,
2359 // inform MIOpt that this might be the start of a proper include guard.
2360 // Otherwise it is some other form of unknown conditional which we can't
2362 if (!ReadAnyTokensBeforeDirective && !MI) {
2363 assert(isIfndef && "#ifdef shouldn't reach here");
2364 CurPPLexer->MIOpt.EnterTopLevelIfndef(MII, MacroNameTok.getLocation());
2366 CurPPLexer->MIOpt.EnterTopLevelConditional();
2369 // If there is a macro, process it.
2370 if (MI) // Mark it used.
2371 markMacroAsUsed(MI);
2375 Callbacks->Ifndef(DirectiveTok.getLocation(), MacroNameTok, MD);
2377 Callbacks->Ifdef(DirectiveTok.getLocation(), MacroNameTok, MD);
2380 // Should we include the stuff contained by this directive?
2381 if (!MI == isIfndef) {
2382 // Yes, remember that we are inside a conditional, then lex the next token.
2383 CurPPLexer->pushConditionalLevel(DirectiveTok.getLocation(),
2384 /*wasskip*/false, /*foundnonskip*/true,
2385 /*foundelse*/false);
2387 // No, skip the contents of this block.
2388 SkipExcludedConditionalBlock(DirectiveTok.getLocation(),
2389 /*Foundnonskip*/false,
2390 /*FoundElse*/false);
2394 /// HandleIfDirective - Implements the \#if directive.
2396 void Preprocessor::HandleIfDirective(Token &IfToken,
2397 bool ReadAnyTokensBeforeDirective) {
2400 // Parse and evaluate the conditional expression.
2401 IdentifierInfo *IfNDefMacro = nullptr;
2402 const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation();
2403 const bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro);
2404 const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation();
2406 // If this condition is equivalent to #ifndef X, and if this is the first
2407 // directive seen, handle it for the multiple-include optimization.
2408 if (CurPPLexer->getConditionalStackDepth() == 0) {
2409 if (!ReadAnyTokensBeforeDirective && IfNDefMacro && ConditionalTrue)
2410 // FIXME: Pass in the location of the macro name, not the 'if' token.
2411 CurPPLexer->MIOpt.EnterTopLevelIfndef(IfNDefMacro, IfToken.getLocation());
2413 CurPPLexer->MIOpt.EnterTopLevelConditional();
2417 Callbacks->If(IfToken.getLocation(),
2418 SourceRange(ConditionalBegin, ConditionalEnd),
2419 (ConditionalTrue ? PPCallbacks::CVK_True : PPCallbacks::CVK_False));
2421 // Should we include the stuff contained by this directive?
2422 if (ConditionalTrue) {
2423 // Yes, remember that we are inside a conditional, then lex the next token.
2424 CurPPLexer->pushConditionalLevel(IfToken.getLocation(), /*wasskip*/false,
2425 /*foundnonskip*/true, /*foundelse*/false);
2427 // No, skip the contents of this block.
2428 SkipExcludedConditionalBlock(IfToken.getLocation(), /*Foundnonskip*/false,
2429 /*FoundElse*/false);
2433 /// HandleEndifDirective - Implements the \#endif directive.
2435 void Preprocessor::HandleEndifDirective(Token &EndifToken) {
2438 // Check that this is the whole directive.
2439 CheckEndOfDirective("endif");
2441 PPConditionalInfo CondInfo;
2442 if (CurPPLexer->popConditionalLevel(CondInfo)) {
2443 // No conditionals on the stack: this is an #endif without an #if.
2444 Diag(EndifToken, diag::err_pp_endif_without_if);
2448 // If this the end of a top-level #endif, inform MIOpt.
2449 if (CurPPLexer->getConditionalStackDepth() == 0)
2450 CurPPLexer->MIOpt.ExitTopLevelConditional();
2452 assert(!CondInfo.WasSkipping && !CurPPLexer->LexingRawMode &&
2453 "This code should only be reachable in the non-skipping case!");
2456 Callbacks->Endif(EndifToken.getLocation(), CondInfo.IfLoc);
2459 /// HandleElseDirective - Implements the \#else directive.
2461 void Preprocessor::HandleElseDirective(Token &Result) {
2464 // #else directive in a non-skipping conditional... start skipping.
2465 CheckEndOfDirective("else");
2467 PPConditionalInfo CI;
2468 if (CurPPLexer->popConditionalLevel(CI)) {
2469 Diag(Result, diag::pp_err_else_without_if);
2473 // If this is a top-level #else, inform the MIOpt.
2474 if (CurPPLexer->getConditionalStackDepth() == 0)
2475 CurPPLexer->MIOpt.EnterTopLevelConditional();
2477 // If this is a #else with a #else before it, report the error.
2478 if (CI.FoundElse) Diag(Result, diag::pp_err_else_after_else);
2481 Callbacks->Else(Result.getLocation(), CI.IfLoc);
2483 // Finally, skip the rest of the contents of this block.
2484 SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true,
2485 /*FoundElse*/true, Result.getLocation());
2488 /// HandleElifDirective - Implements the \#elif directive.
2490 void Preprocessor::HandleElifDirective(Token &ElifToken) {
2493 // #elif directive in a non-skipping conditional... start skipping.
2494 // We don't care what the condition is, because we will always skip it (since
2495 // the block immediately before it was included).
2496 const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation();
2497 DiscardUntilEndOfDirective();
2498 const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation();
2500 PPConditionalInfo CI;
2501 if (CurPPLexer->popConditionalLevel(CI)) {
2502 Diag(ElifToken, diag::pp_err_elif_without_if);
2506 // If this is a top-level #elif, inform the MIOpt.
2507 if (CurPPLexer->getConditionalStackDepth() == 0)
2508 CurPPLexer->MIOpt.EnterTopLevelConditional();
2510 // If this is a #elif with a #else before it, report the error.
2511 if (CI.FoundElse) Diag(ElifToken, diag::pp_err_elif_after_else);
2514 Callbacks->Elif(ElifToken.getLocation(),
2515 SourceRange(ConditionalBegin, ConditionalEnd),
2516 PPCallbacks::CVK_NotEvaluated, CI.IfLoc);
2518 // Finally, skip the rest of the contents of this block.
2519 SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true,
2520 /*FoundElse*/CI.FoundElse,
2521 ElifToken.getLocation());