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 //===----------------------------------------------------------------------===//
10 // This file implements # directive processing for the Preprocessor.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Lex/Preprocessor.h"
15 #include "clang/Lex/LiteralSupport.h"
16 #include "clang/Lex/HeaderSearch.h"
17 #include "clang/Lex/MacroInfo.h"
18 #include "clang/Lex/LexDiagnostic.h"
19 #include "clang/Basic/FileManager.h"
20 #include "clang/Basic/SourceManager.h"
21 #include "llvm/ADT/APInt.h"
22 using namespace clang;
24 //===----------------------------------------------------------------------===//
25 // Utility Methods for Preprocessor Directive Handling.
26 //===----------------------------------------------------------------------===//
28 MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) {
31 if (!MICache.empty()) {
35 MI = (MacroInfo*) BP.Allocate<MacroInfo>();
36 new (MI) MacroInfo(L);
40 /// ReleaseMacroInfo - Release the specified MacroInfo. This memory will
41 /// be reused for allocating new MacroInfo objects.
42 void Preprocessor::ReleaseMacroInfo(MacroInfo* MI) {
43 MICache.push_back(MI);
44 MI->FreeArgumentList(BP);
48 /// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the
49 /// current line until the tok::eom token is found.
50 void Preprocessor::DiscardUntilEndOfDirective() {
53 LexUnexpandedToken(Tmp);
54 } while (Tmp.isNot(tok::eom));
57 /// ReadMacroName - Lex and validate a macro name, which occurs after a
58 /// #define or #undef. This sets the token kind to eom and discards the rest
59 /// of the macro line if the macro name is invalid. isDefineUndef is 1 if
60 /// this is due to a a #define, 2 if #undef directive, 0 if it is something
61 /// else (e.g. #ifdef).
62 void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) {
63 // Read the token, don't allow macro expansion on it.
64 LexUnexpandedToken(MacroNameTok);
66 // Missing macro name?
67 if (MacroNameTok.is(tok::eom)) {
68 Diag(MacroNameTok, diag::err_pp_missing_macro_name);
72 IdentifierInfo *II = MacroNameTok.getIdentifierInfo();
75 std::string Spelling = getSpelling(MacroNameTok, &Invalid);
79 const IdentifierInfo &Info = Identifiers.get(Spelling);
80 if (Info.isCPlusPlusOperatorKeyword())
81 // C++ 2.5p2: Alternative tokens behave the same as its primary token
82 // except for their spellings.
83 Diag(MacroNameTok, diag::err_pp_operator_used_as_macro_name) << Spelling;
85 Diag(MacroNameTok, diag::err_pp_macro_not_identifier);
86 // Fall through on error.
87 } else if (isDefineUndef && II->getPPKeywordID() == tok::pp_defined) {
88 // Error if defining "defined": C99 6.10.8.4.
89 Diag(MacroNameTok, diag::err_defined_macro_name);
90 } else if (isDefineUndef && II->hasMacroDefinition() &&
91 getMacroInfo(II)->isBuiltinMacro()) {
92 // Error if defining "__LINE__" and other builtins: C99 6.10.8.4.
93 if (isDefineUndef == 1)
94 Diag(MacroNameTok, diag::pp_redef_builtin_macro);
96 Diag(MacroNameTok, diag::pp_undef_builtin_macro);
98 // Okay, we got a good identifier node. Return it.
102 // Invalid macro name, read and discard the rest of the line. Then set the
103 // token kind to tok::eom.
104 MacroNameTok.setKind(tok::eom);
105 return DiscardUntilEndOfDirective();
108 /// CheckEndOfDirective - Ensure that the next token is a tok::eom token. If
109 /// not, emit a diagnostic and consume up until the eom. If EnableMacros is
110 /// true, then we consider macros that expand to zero tokens as being ok.
111 void Preprocessor::CheckEndOfDirective(const char *DirType, bool EnableMacros) {
113 // Lex unexpanded tokens for most directives: macros might expand to zero
114 // tokens, causing us to miss diagnosing invalid lines. Some directives (like
115 // #line) allow empty macros.
119 LexUnexpandedToken(Tmp);
121 // There should be no tokens after the directive, but we allow them as an
123 while (Tmp.is(tok::comment)) // Skip comments in -C mode.
124 LexUnexpandedToken(Tmp);
126 if (Tmp.isNot(tok::eom)) {
127 // Add a fixit in GNU/C99/C++ mode. Don't offer a fixit for strict-C89,
128 // because it is more trouble than it is worth to insert /**/ and check that
129 // there is no /**/ in the range also.
131 if (Features.GNUMode || Features.C99 || Features.CPlusPlus)
132 Hint = FixItHint::CreateInsertion(Tmp.getLocation(),"//");
133 Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType << Hint;
134 DiscardUntilEndOfDirective();
140 /// SkipExcludedConditionalBlock - We just read a #if or related directive and
141 /// decided that the subsequent tokens are in the #if'd out portion of the
142 /// file. Lex the rest of the file, until we see an #endif. If
143 /// FoundNonSkipPortion is true, then we have already emitted code for part of
144 /// this #if directive, so #else/#elif blocks should never be entered. If ElseOk
145 /// is true, then #else directives are ok, if not, then we have already seen one
146 /// so a #else directive is a duplicate. When this returns, the caller can lex
147 /// the first valid token.
148 void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc,
149 bool FoundNonSkipPortion,
152 assert(CurTokenLexer == 0 && CurPPLexer && "Lexing a macro, not a file?");
154 CurPPLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false,
155 FoundNonSkipPortion, FoundElse);
158 PTHSkipExcludedConditionalBlock();
162 // Enter raw mode to disable identifier lookup (and thus macro expansion),
163 // disabling warnings, etc.
164 CurPPLexer->LexingRawMode = true;
169 // If this is the end of the buffer, we have an error.
170 if (Tok.is(tok::eof)) {
171 // Emit errors for each unterminated conditional on the stack, including
173 while (!CurPPLexer->ConditionalStack.empty()) {
174 Diag(CurPPLexer->ConditionalStack.back().IfLoc,
175 diag::err_pp_unterminated_conditional);
176 CurPPLexer->ConditionalStack.pop_back();
179 // Just return and let the caller lex after this #include.
183 // If this token is not a preprocessor directive, just skip it.
184 if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine())
187 // We just parsed a # character at the start of a line, so we're in
188 // directive mode. Tell the lexer this so any newlines we see will be
189 // converted into an EOM token (this terminates the macro).
190 CurPPLexer->ParsingPreprocessorDirective = true;
191 if (CurLexer) CurLexer->SetCommentRetentionState(false);
194 // Read the next token, the directive flavor.
195 LexUnexpandedToken(Tok);
197 // If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or
198 // something bogus), skip it.
199 if (Tok.isNot(tok::identifier)) {
200 CurPPLexer->ParsingPreprocessorDirective = false;
201 // Restore comment saving mode.
202 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
206 // If the first letter isn't i or e, it isn't intesting to us. We know that
207 // this is safe in the face of spelling differences, because there is no way
208 // to spell an i/e in a strange way that is another letter. Skipping this
209 // allows us to avoid looking up the identifier info for #define/#undef and
210 // other common directives.
211 bool Invalid = false;
212 const char *RawCharData = SourceMgr.getCharacterData(Tok.getLocation(),
217 char FirstChar = RawCharData[0];
218 if (FirstChar >= 'a' && FirstChar <= 'z' &&
219 FirstChar != 'i' && FirstChar != 'e') {
220 CurPPLexer->ParsingPreprocessorDirective = false;
221 // Restore comment saving mode.
222 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
226 // Get the identifier name without trigraphs or embedded newlines. Note
227 // that we can't use Tok.getIdentifierInfo() because its lookup is disabled
229 char DirectiveBuf[20];
230 llvm::StringRef Directive;
231 if (!Tok.needsCleaning() && Tok.getLength() < 20) {
232 Directive = llvm::StringRef(RawCharData, Tok.getLength());
234 std::string DirectiveStr = getSpelling(Tok);
235 unsigned IdLen = DirectiveStr.size();
237 CurPPLexer->ParsingPreprocessorDirective = false;
238 // Restore comment saving mode.
239 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
242 memcpy(DirectiveBuf, &DirectiveStr[0], IdLen);
243 Directive = llvm::StringRef(DirectiveBuf, IdLen);
246 if (Directive.startswith("if")) {
247 llvm::StringRef Sub = Directive.substr(2);
248 if (Sub.empty() || // "if"
249 Sub == "def" || // "ifdef"
250 Sub == "ndef") { // "ifndef"
251 // We know the entire #if/#ifdef/#ifndef block will be skipped, don't
252 // bother parsing the condition.
253 DiscardUntilEndOfDirective();
254 CurPPLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true,
255 /*foundnonskip*/false,
258 } else if (Directive[0] == 'e') {
259 llvm::StringRef Sub = Directive.substr(1);
260 if (Sub == "ndif") { // "endif"
261 CheckEndOfDirective("endif");
262 PPConditionalInfo CondInfo;
263 CondInfo.WasSkipping = true; // Silence bogus warning.
264 bool InCond = CurPPLexer->popConditionalLevel(CondInfo);
265 InCond = InCond; // Silence warning in no-asserts mode.
266 assert(!InCond && "Can't be skipping if not in a conditional!");
268 // If we popped the outermost skipping block, we're done skipping!
269 if (!CondInfo.WasSkipping)
271 } else if (Sub == "lse") { // "else".
272 // #else directive in a skipping conditional. If not in some other
273 // skipping conditional, and if #else hasn't already been seen, enter it
274 // as a non-skipping conditional.
275 DiscardUntilEndOfDirective(); // C99 6.10p4.
276 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
278 // If this is a #else with a #else before it, report the error.
279 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else);
281 // Note that we've seen a #else in this conditional.
282 CondInfo.FoundElse = true;
284 // If the conditional is at the top level, and the #if block wasn't
285 // entered, enter the #else block now.
286 if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) {
287 CondInfo.FoundNonSkip = true;
290 } else if (Sub == "lif") { // "elif".
291 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
294 // If this is in a skipping block or if we're already handled this #if
295 // block, don't bother parsing the condition.
296 if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) {
297 DiscardUntilEndOfDirective();
300 // Restore the value of LexingRawMode so that identifiers are
301 // looked up, etc, inside the #elif expression.
302 assert(CurPPLexer->LexingRawMode && "We have to be skipping here!");
303 CurPPLexer->LexingRawMode = false;
304 IdentifierInfo *IfNDefMacro = 0;
305 ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
306 CurPPLexer->LexingRawMode = true;
309 // If this is a #elif with a #else before it, report the error.
310 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else);
312 // If this condition is true, enter it!
314 CondInfo.FoundNonSkip = true;
320 CurPPLexer->ParsingPreprocessorDirective = false;
321 // Restore comment saving mode.
322 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
325 // Finally, if we are out of the conditional (saw an #endif or ran off the end
326 // of the file, just stop skipping and return to lexing whatever came after
328 CurPPLexer->LexingRawMode = false;
331 void Preprocessor::PTHSkipExcludedConditionalBlock() {
335 assert(CurPTHLexer->LexingRawMode == false);
337 // Skip to the next '#else', '#elif', or #endif.
338 if (CurPTHLexer->SkipBlock()) {
339 // We have reached an #endif. Both the '#' and 'endif' tokens
340 // have been consumed by the PTHLexer. Just pop off the condition level.
341 PPConditionalInfo CondInfo;
342 bool InCond = CurPTHLexer->popConditionalLevel(CondInfo);
343 InCond = InCond; // Silence warning in no-asserts mode.
344 assert(!InCond && "Can't be skipping if not in a conditional!");
348 // We have reached a '#else' or '#elif'. Lex the next token to get
349 // the directive flavor.
351 LexUnexpandedToken(Tok);
353 // We can actually look up the IdentifierInfo here since we aren't in
355 tok::PPKeywordKind K = Tok.getIdentifierInfo()->getPPKeywordID();
357 if (K == tok::pp_else) {
358 // #else: Enter the else condition. We aren't in a nested condition
359 // since we skip those. We're always in the one matching the last
360 // blocked we skipped.
361 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
362 // Note that we've seen a #else in this conditional.
363 CondInfo.FoundElse = true;
365 // If the #if block wasn't entered then enter the #else block now.
366 if (!CondInfo.FoundNonSkip) {
367 CondInfo.FoundNonSkip = true;
369 // Scan until the eom token.
370 CurPTHLexer->ParsingPreprocessorDirective = true;
371 DiscardUntilEndOfDirective();
372 CurPTHLexer->ParsingPreprocessorDirective = false;
377 // Otherwise skip this block.
381 assert(K == tok::pp_elif);
382 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
384 // If this is a #elif with a #else before it, report the error.
385 if (CondInfo.FoundElse)
386 Diag(Tok, diag::pp_err_elif_after_else);
388 // If this is in a skipping block or if we're already handled this #if
389 // block, don't bother parsing the condition. We just skip this block.
390 if (CondInfo.FoundNonSkip)
393 // Evaluate the condition of the #elif.
394 IdentifierInfo *IfNDefMacro = 0;
395 CurPTHLexer->ParsingPreprocessorDirective = true;
396 bool ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
397 CurPTHLexer->ParsingPreprocessorDirective = false;
399 // If this condition is true, enter it!
401 CondInfo.FoundNonSkip = true;
405 // Otherwise, skip this block and go to the next one.
410 /// LookupFile - Given a "foo" or <foo> reference, look up the indicated file,
411 /// return null on failure. isAngled indicates whether the file reference is
412 /// for system #include's or not (i.e. using <> instead of "").
413 const FileEntry *Preprocessor::LookupFile(llvm::StringRef Filename,
415 const DirectoryLookup *FromDir,
416 const DirectoryLookup *&CurDir) {
417 // If the header lookup mechanism may be relative to the current file, pass in
418 // info about where the current file is.
419 const FileEntry *CurFileEnt = 0;
421 FileID FID = getCurrentFileLexer()->getFileID();
422 CurFileEnt = SourceMgr.getFileEntryForID(FID);
424 // If there is no file entry associated with this file, it must be the
425 // predefines buffer. Any other file is not lexed with a normal lexer, so
426 // it won't be scanned for preprocessor directives. If we have the
427 // predefines buffer, resolve #include references (which come from the
428 // -include command line argument) as if they came from the main file, this
429 // affects file lookup etc.
430 if (CurFileEnt == 0) {
431 FID = SourceMgr.getMainFileID();
432 CurFileEnt = SourceMgr.getFileEntryForID(FID);
436 // Do a standard file entry lookup.
437 CurDir = CurDirLookup;
438 const FileEntry *FE =
439 HeaderInfo.LookupFile(Filename, isAngled, FromDir, CurDir, CurFileEnt);
442 // Otherwise, see if this is a subframework header. If so, this is relative
443 // to one of the headers on the #include stack. Walk the list of the current
444 // headers on the #include stack and pass them to HeaderInfo.
446 if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID())))
447 if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt)))
451 for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
452 IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1];
453 if (IsFileLexer(ISEntry)) {
455 SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID())))
456 if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt)))
461 // Otherwise, we really couldn't find the file.
466 //===----------------------------------------------------------------------===//
467 // Preprocessor Directive Handling.
468 //===----------------------------------------------------------------------===//
470 /// HandleDirective - This callback is invoked when the lexer sees a # token
471 /// at the start of a line. This consumes the directive, modifies the
472 /// lexer/preprocessor state, and advances the lexer(s) so that the next token
473 /// read is the correct one.
474 void Preprocessor::HandleDirective(Token &Result) {
475 // FIXME: Traditional: # with whitespace before it not recognized by K&R?
477 // We just parsed a # character at the start of a line, so we're in directive
478 // mode. Tell the lexer this so any newlines we see will be converted into an
479 // EOM token (which terminates the directive).
480 CurPPLexer->ParsingPreprocessorDirective = true;
484 // We are about to read a token. For the multiple-include optimization FA to
485 // work, we have to remember if we had read any tokens *before* this
487 bool ReadAnyTokensBeforeDirective =CurPPLexer->MIOpt.getHasReadAnyTokensVal();
489 // Save the '#' token in case we need to return it later.
490 Token SavedHash = Result;
492 // Read the next token, the directive flavor. This isn't expanded due to
494 LexUnexpandedToken(Result);
496 // C99 6.10.3p11: Is this preprocessor directive in macro invocation? e.g.:
501 // If so, the user is relying on non-portable behavior, emit a diagnostic.
503 Diag(Result, diag::ext_embedded_directive);
506 switch (Result.getKind()) {
508 return; // null directive.
510 // Handle stuff like "# /*foo*/ define X" in -E -C mode.
511 LexUnexpandedToken(Result);
514 case tok::numeric_constant: // # 7 GNU line marker directive.
515 if (getLangOptions().AsmPreprocessor)
516 break; // # 4 is not a preprocessor directive in .S files.
517 return HandleDigitDirective(Result);
519 IdentifierInfo *II = Result.getIdentifierInfo();
520 if (II == 0) break; // Not an identifier.
522 // Ask what the preprocessor keyword ID is.
523 switch (II->getPPKeywordID()) {
525 // C99 6.10.1 - Conditional Inclusion.
527 return HandleIfDirective(Result, ReadAnyTokensBeforeDirective);
529 return HandleIfdefDirective(Result, false, true/*not valid for miopt*/);
531 return HandleIfdefDirective(Result, true, ReadAnyTokensBeforeDirective);
533 return HandleElifDirective(Result);
535 return HandleElseDirective(Result);
537 return HandleEndifDirective(Result);
539 // C99 6.10.2 - Source File Inclusion.
540 case tok::pp_include:
541 return HandleIncludeDirective(Result); // Handle #include.
542 case tok::pp___include_macros:
543 return HandleIncludeMacrosDirective(Result); // Handle -imacros.
545 // C99 6.10.3 - Macro Replacement.
547 return HandleDefineDirective(Result);
549 return HandleUndefDirective(Result);
551 // C99 6.10.4 - Line Control.
553 return HandleLineDirective(Result);
555 // C99 6.10.5 - Error Directive.
557 return HandleUserDiagnosticDirective(Result, false);
559 // C99 6.10.6 - Pragma Directive.
561 return HandlePragmaDirective();
565 return HandleImportDirective(Result);
566 case tok::pp_include_next:
567 return HandleIncludeNextDirective(Result);
569 case tok::pp_warning:
570 Diag(Result, diag::ext_pp_warning_directive);
571 return HandleUserDiagnosticDirective(Result, true);
573 return HandleIdentSCCSDirective(Result);
575 return HandleIdentSCCSDirective(Result);
577 //isExtension = true; // FIXME: implement #assert
579 case tok::pp_unassert:
580 //isExtension = true; // FIXME: implement #unassert
586 // If this is a .S file, treat unknown # directives as non-preprocessor
587 // directives. This is important because # may be a comment or introduce
588 // various pseudo-ops. Just return the # token and push back the following
589 // token to be lexed next time.
590 if (getLangOptions().AsmPreprocessor) {
591 Token *Toks = new Token[2];
592 // Return the # and the token after it.
595 // Enter this token stream so that we re-lex the tokens. Make sure to
596 // enable macro expansion, in case the token after the # is an identifier
598 EnterTokenStream(Toks, 2, false, true);
602 // If we reached here, the preprocessing token is not valid!
603 Diag(Result, diag::err_pp_invalid_directive);
605 // Read the rest of the PP line.
606 DiscardUntilEndOfDirective();
608 // Okay, we're done parsing the directive.
611 /// GetLineValue - Convert a numeric token into an unsigned value, emitting
612 /// Diagnostic DiagID if it is invalid, and returning the value in Val.
613 static bool GetLineValue(Token &DigitTok, unsigned &Val,
614 unsigned DiagID, Preprocessor &PP) {
615 if (DigitTok.isNot(tok::numeric_constant)) {
616 PP.Diag(DigitTok, DiagID);
618 if (DigitTok.isNot(tok::eom))
619 PP.DiscardUntilEndOfDirective();
623 llvm::SmallString<64> IntegerBuffer;
624 IntegerBuffer.resize(DigitTok.getLength());
625 const char *DigitTokBegin = &IntegerBuffer[0];
626 bool Invalid = false;
627 unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin, &Invalid);
631 // Verify that we have a simple digit-sequence, and compute the value. This
632 // is always a simple digit string computed in decimal, so we do this manually
635 for (unsigned i = 0; i != ActualLength; ++i) {
636 if (!isdigit(DigitTokBegin[i])) {
637 PP.Diag(PP.AdvanceToTokenCharacter(DigitTok.getLocation(), i),
638 diag::err_pp_line_digit_sequence);
639 PP.DiscardUntilEndOfDirective();
643 unsigned NextVal = Val*10+(DigitTokBegin[i]-'0');
644 if (NextVal < Val) { // overflow.
645 PP.Diag(DigitTok, DiagID);
646 PP.DiscardUntilEndOfDirective();
652 // Reject 0, this is needed both by #line numbers and flags.
654 PP.Diag(DigitTok, DiagID);
655 PP.DiscardUntilEndOfDirective();
659 if (DigitTokBegin[0] == '0')
660 PP.Diag(DigitTok.getLocation(), diag::warn_pp_line_decimal);
665 /// HandleLineDirective - Handle #line directive: C99 6.10.4. The two
666 /// acceptable forms are:
667 /// # line digit-sequence
668 /// # line digit-sequence "s-char-sequence"
669 void Preprocessor::HandleLineDirective(Token &Tok) {
670 // Read the line # and string argument. Per C99 6.10.4p5, these tokens are
675 // Validate the number and convert it to an unsigned.
677 if (GetLineValue(DigitTok, LineNo, diag::err_pp_line_requires_integer,*this))
680 // Enforce C99 6.10.4p3: "The digit sequence shall not specify ... a
681 // number greater than 2147483647". C90 requires that the line # be <= 32767.
682 unsigned LineLimit = Features.C99 ? 2147483648U : 32768U;
683 if (LineNo >= LineLimit)
684 Diag(DigitTok, diag::ext_pp_line_too_big) << LineLimit;
690 // If the StrTok is "eom", then it wasn't present. Otherwise, it must be a
691 // string followed by eom.
692 if (StrTok.is(tok::eom))
694 else if (StrTok.isNot(tok::string_literal)) {
695 Diag(StrTok, diag::err_pp_line_invalid_filename);
696 DiscardUntilEndOfDirective();
699 // Parse and validate the string, converting it into a unique ID.
700 StringLiteralParser Literal(&StrTok, 1, *this);
701 assert(!Literal.AnyWide && "Didn't allow wide strings in");
702 if (Literal.hadError)
703 return DiscardUntilEndOfDirective();
704 if (Literal.Pascal) {
705 Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
706 return DiscardUntilEndOfDirective();
708 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(),
709 Literal.GetStringLength());
711 // Verify that there is nothing after the string, other than EOM. Because
712 // of C99 6.10.4p5, macros that expand to empty tokens are ok.
713 CheckEndOfDirective("line", true);
716 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID);
719 Callbacks->FileChanged(CurPPLexer->getSourceLocation(),
720 PPCallbacks::RenameFile,
724 /// ReadLineMarkerFlags - Parse and validate any flags at the end of a GNU line
725 /// marker directive.
726 static bool ReadLineMarkerFlags(bool &IsFileEntry, bool &IsFileExit,
727 bool &IsSystemHeader, bool &IsExternCHeader,
732 if (FlagTok.is(tok::eom)) return false;
733 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP))
740 if (FlagTok.is(tok::eom)) return false;
741 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP))
743 } else if (FlagVal == 2) {
746 SourceManager &SM = PP.getSourceManager();
747 // If we are leaving the current presumed file, check to make sure the
748 // presumed include stack isn't empty!
750 SM.getDecomposedInstantiationLoc(FlagTok.getLocation()).first;
751 PresumedLoc PLoc = SM.getPresumedLoc(FlagTok.getLocation());
753 // If there is no include loc (main file) or if the include loc is in a
754 // different physical file, then we aren't in a "1" line marker flag region.
755 SourceLocation IncLoc = PLoc.getIncludeLoc();
756 if (IncLoc.isInvalid() ||
757 SM.getDecomposedInstantiationLoc(IncLoc).first != CurFileID) {
758 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_pop);
759 PP.DiscardUntilEndOfDirective();
764 if (FlagTok.is(tok::eom)) return false;
765 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP))
769 // We must have 3 if there are still flags.
771 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
772 PP.DiscardUntilEndOfDirective();
776 IsSystemHeader = true;
779 if (FlagTok.is(tok::eom)) return false;
780 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP))
783 // We must have 4 if there is yet another flag.
785 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
786 PP.DiscardUntilEndOfDirective();
790 IsExternCHeader = true;
793 if (FlagTok.is(tok::eom)) return false;
795 // There are no more valid flags here.
796 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
797 PP.DiscardUntilEndOfDirective();
801 /// HandleDigitDirective - Handle a GNU line marker directive, whose syntax is
802 /// one of the following forms:
805 /// # 42 "file" ('1' | '2')?
806 /// # 42 "file" ('1' | '2')? '3' '4'?
808 void Preprocessor::HandleDigitDirective(Token &DigitTok) {
809 // Validate the number and convert it to an unsigned. GNU does not have a
810 // line # limit other than it fit in 32-bits.
812 if (GetLineValue(DigitTok, LineNo, diag::err_pp_linemarker_requires_integer,
819 bool IsFileEntry = false, IsFileExit = false;
820 bool IsSystemHeader = false, IsExternCHeader = false;
823 // If the StrTok is "eom", then it wasn't present. Otherwise, it must be a
824 // string followed by eom.
825 if (StrTok.is(tok::eom))
827 else if (StrTok.isNot(tok::string_literal)) {
828 Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
829 return DiscardUntilEndOfDirective();
831 // Parse and validate the string, converting it into a unique ID.
832 StringLiteralParser Literal(&StrTok, 1, *this);
833 assert(!Literal.AnyWide && "Didn't allow wide strings in");
834 if (Literal.hadError)
835 return DiscardUntilEndOfDirective();
836 if (Literal.Pascal) {
837 Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
838 return DiscardUntilEndOfDirective();
840 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(),
841 Literal.GetStringLength());
843 // If a filename was present, read any flags that are present.
844 if (ReadLineMarkerFlags(IsFileEntry, IsFileExit,
845 IsSystemHeader, IsExternCHeader, *this))
849 // Create a line note with this information.
850 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID,
851 IsFileEntry, IsFileExit,
852 IsSystemHeader, IsExternCHeader);
854 // If the preprocessor has callbacks installed, notify them of the #line
855 // change. This is used so that the line marker comes out in -E mode for
858 PPCallbacks::FileChangeReason Reason = PPCallbacks::RenameFile;
860 Reason = PPCallbacks::EnterFile;
862 Reason = PPCallbacks::ExitFile;
863 SrcMgr::CharacteristicKind FileKind = SrcMgr::C_User;
865 FileKind = SrcMgr::C_ExternCSystem;
866 else if (IsSystemHeader)
867 FileKind = SrcMgr::C_System;
869 Callbacks->FileChanged(CurPPLexer->getSourceLocation(), Reason, FileKind);
874 /// HandleUserDiagnosticDirective - Handle a #warning or #error directive.
876 void Preprocessor::HandleUserDiagnosticDirective(Token &Tok,
878 // PTH doesn't emit #warning or #error directives.
880 return CurPTHLexer->DiscardToEndOfLine();
882 // Read the rest of the line raw. We do this because we don't want macros
883 // to be expanded and we don't require that the tokens be valid preprocessing
884 // tokens. For example, this is allowed: "#warning ` 'foo". GCC does
885 // collapse multiple consequtive white space between tokens, but this isn't
886 // specified by the standard.
887 std::string Message = CurLexer->ReadToEndOfLine();
889 Diag(Tok, diag::pp_hash_warning) << Message;
891 Diag(Tok, diag::err_pp_hash_error) << Message;
894 /// HandleIdentSCCSDirective - Handle a #ident/#sccs directive.
896 void Preprocessor::HandleIdentSCCSDirective(Token &Tok) {
897 // Yes, this directive is an extension.
898 Diag(Tok, diag::ext_pp_ident_directive);
900 // Read the string argument.
904 // If the token kind isn't a string, it's a malformed directive.
905 if (StrTok.isNot(tok::string_literal) &&
906 StrTok.isNot(tok::wide_string_literal)) {
907 Diag(StrTok, diag::err_pp_malformed_ident);
908 if (StrTok.isNot(tok::eom))
909 DiscardUntilEndOfDirective();
913 // Verify that there is nothing after the string, other than EOM.
914 CheckEndOfDirective("ident");
917 bool Invalid = false;
918 std::string Str = getSpelling(StrTok, &Invalid);
920 Callbacks->Ident(Tok.getLocation(), Str);
924 //===----------------------------------------------------------------------===//
925 // Preprocessor Include Directive Handling.
926 //===----------------------------------------------------------------------===//
928 /// GetIncludeFilenameSpelling - Turn the specified lexer token into a fully
929 /// checked and spelled filename, e.g. as an operand of #include. This returns
930 /// true if the input filename was in <>'s or false if it were in ""'s. The
931 /// caller is expected to provide a buffer that is large enough to hold the
932 /// spelling of the filename, but is also expected to handle the case when
933 /// this method decides to use a different buffer.
934 bool Preprocessor::GetIncludeFilenameSpelling(SourceLocation Loc,
935 llvm::StringRef &Buffer) {
936 // Get the text form of the filename.
937 assert(!Buffer.empty() && "Can't have tokens with empty spellings!");
939 // Make sure the filename is <x> or "x".
941 if (Buffer[0] == '<') {
942 if (Buffer.back() != '>') {
943 Diag(Loc, diag::err_pp_expects_filename);
944 Buffer = llvm::StringRef();
948 } else if (Buffer[0] == '"') {
949 if (Buffer.back() != '"') {
950 Diag(Loc, diag::err_pp_expects_filename);
951 Buffer = llvm::StringRef();
956 Diag(Loc, diag::err_pp_expects_filename);
957 Buffer = llvm::StringRef();
961 // Diagnose #include "" as invalid.
962 if (Buffer.size() <= 2) {
963 Diag(Loc, diag::err_pp_empty_filename);
964 Buffer = llvm::StringRef();
968 // Skip the brackets.
969 Buffer = Buffer.substr(1, Buffer.size()-2);
973 /// ConcatenateIncludeName - Handle cases where the #include name is expanded
974 /// from a macro as multiple tokens, which need to be glued together. This
975 /// occurs for code like:
976 /// #define FOO <a/b.h>
978 /// because in this case, "<a/b.h>" is returned as 7 tokens, not one.
980 /// This code concatenates and consumes tokens up to the '>' token. It returns
981 /// false if the > was found, otherwise it returns true if it finds and consumes
983 bool Preprocessor::ConcatenateIncludeName(
984 llvm::SmallString<128> &FilenameBuffer) {
988 while (CurTok.isNot(tok::eom)) {
989 // Append the spelling of this token to the buffer. If there was a space
990 // before it, add it now.
991 if (CurTok.hasLeadingSpace())
992 FilenameBuffer.push_back(' ');
994 // Get the spelling of the token, directly into FilenameBuffer if possible.
995 unsigned PreAppendSize = FilenameBuffer.size();
996 FilenameBuffer.resize(PreAppendSize+CurTok.getLength());
998 const char *BufPtr = &FilenameBuffer[PreAppendSize];
999 unsigned ActualLen = getSpelling(CurTok, BufPtr);
1001 // If the token was spelled somewhere else, copy it into FilenameBuffer.
1002 if (BufPtr != &FilenameBuffer[PreAppendSize])
1003 memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen);
1005 // Resize FilenameBuffer to the correct size.
1006 if (CurTok.getLength() != ActualLen)
1007 FilenameBuffer.resize(PreAppendSize+ActualLen);
1009 // If we found the '>' marker, return success.
1010 if (CurTok.is(tok::greater))
1016 // If we hit the eom marker, emit an error and return true so that the caller
1017 // knows the EOM has been read.
1018 Diag(CurTok.getLocation(), diag::err_pp_expects_filename);
1022 /// HandleIncludeDirective - The "#include" tokens have just been read, read the
1023 /// file to be included from the lexer, then include it! This is a common
1024 /// routine with functionality shared between #include, #include_next and
1025 /// #import. LookupFrom is set when this is a #include_next directive, it
1026 /// specifies the file to start searching from.
1027 void Preprocessor::HandleIncludeDirective(Token &IncludeTok,
1028 const DirectoryLookup *LookupFrom,
1032 CurPPLexer->LexIncludeFilename(FilenameTok);
1034 // Reserve a buffer to get the spelling.
1035 llvm::SmallString<128> FilenameBuffer;
1036 llvm::StringRef Filename;
1038 switch (FilenameTok.getKind()) {
1040 // If the token kind is EOM, the error has already been diagnosed.
1043 case tok::angle_string_literal:
1044 case tok::string_literal:
1045 Filename = getSpelling(FilenameTok, FilenameBuffer);
1049 // This could be a <foo/bar.h> file coming from a macro expansion. In this
1050 // case, glue the tokens together into FilenameBuffer and interpret those.
1051 FilenameBuffer.push_back('<');
1052 if (ConcatenateIncludeName(FilenameBuffer))
1053 return; // Found <eom> but no ">"? Diagnostic already emitted.
1054 Filename = FilenameBuffer.str();
1057 Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
1058 DiscardUntilEndOfDirective();
1063 GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename);
1064 // If GetIncludeFilenameSpelling set the start ptr to null, there was an
1066 if (Filename.empty()) {
1067 DiscardUntilEndOfDirective();
1071 // Verify that there is nothing after the filename, other than EOM. Note that
1072 // we allow macros that expand to nothing after the filename, because this
1073 // falls into the category of "#include pp-tokens new-line" specified in
1075 CheckEndOfDirective(IncludeTok.getIdentifierInfo()->getNameStart(), true);
1077 // Check that we don't have infinite #include recursion.
1078 if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1) {
1079 Diag(FilenameTok, diag::err_pp_include_too_deep);
1083 // Search include directories.
1084 const DirectoryLookup *CurDir;
1085 const FileEntry *File = LookupFile(Filename, isAngled, LookupFrom, CurDir);
1087 Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
1091 // The #included file will be considered to be a system header if either it is
1092 // in a system include directory, or if the #includer is a system include
1094 SrcMgr::CharacteristicKind FileCharacter =
1095 std::max(HeaderInfo.getFileDirFlavor(File),
1096 SourceMgr.getFileCharacteristic(FilenameTok.getLocation()));
1098 // Ask HeaderInfo if we should enter this #include file. If not, #including
1099 // this file will have no effect.
1100 if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) {
1102 Callbacks->FileSkipped(*File, FilenameTok, FileCharacter);
1106 // Look up the file, create a File ID for it.
1107 FileID FID = SourceMgr.createFileID(File, FilenameTok.getLocation(),
1109 if (FID.isInvalid()) {
1110 Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
1114 // Finally, if all is good, enter the new file!
1115 EnterSourceFile(FID, CurDir, FilenameTok.getLocation());
1118 /// HandleIncludeNextDirective - Implements #include_next.
1120 void Preprocessor::HandleIncludeNextDirective(Token &IncludeNextTok) {
1121 Diag(IncludeNextTok, diag::ext_pp_include_next_directive);
1123 // #include_next is like #include, except that we start searching after
1124 // the current found directory. If we can't do this, issue a
1126 const DirectoryLookup *Lookup = CurDirLookup;
1127 if (isInPrimaryFile()) {
1129 Diag(IncludeNextTok, diag::pp_include_next_in_primary);
1130 } else if (Lookup == 0) {
1131 Diag(IncludeNextTok, diag::pp_include_next_absolute_path);
1133 // Start looking up in the next directory.
1137 return HandleIncludeDirective(IncludeNextTok, Lookup);
1140 /// HandleImportDirective - Implements #import.
1142 void Preprocessor::HandleImportDirective(Token &ImportTok) {
1143 if (!Features.ObjC1) // #import is standard for ObjC.
1144 Diag(ImportTok, diag::ext_pp_import_directive);
1146 return HandleIncludeDirective(ImportTok, 0, true);
1149 /// HandleIncludeMacrosDirective - The -imacros command line option turns into a
1150 /// pseudo directive in the predefines buffer. This handles it by sucking all
1151 /// tokens through the preprocessor and discarding them (only keeping the side
1152 /// effects on the preprocessor).
1153 void Preprocessor::HandleIncludeMacrosDirective(Token &IncludeMacrosTok) {
1154 // This directive should only occur in the predefines buffer. If not, emit an
1155 // error and reject it.
1156 SourceLocation Loc = IncludeMacrosTok.getLocation();
1157 if (strcmp(SourceMgr.getBufferName(Loc), "<built-in>") != 0) {
1158 Diag(IncludeMacrosTok.getLocation(),
1159 diag::pp_include_macros_out_of_predefines);
1160 DiscardUntilEndOfDirective();
1164 // Treat this as a normal #include for checking purposes. If this is
1165 // successful, it will push a new lexer onto the include stack.
1166 HandleIncludeDirective(IncludeMacrosTok, 0, false);
1171 assert(TmpTok.isNot(tok::eof) && "Didn't find end of -imacros!");
1172 } while (TmpTok.isNot(tok::hashhash));
1175 //===----------------------------------------------------------------------===//
1176 // Preprocessor Macro Directive Handling.
1177 //===----------------------------------------------------------------------===//
1179 /// ReadMacroDefinitionArgList - The ( starting an argument list of a macro
1180 /// definition has just been read. Lex the rest of the arguments and the
1181 /// closing ), updating MI with what we learn. Return true if an error occurs
1182 /// parsing the arg list.
1183 bool Preprocessor::ReadMacroDefinitionArgList(MacroInfo *MI) {
1184 llvm::SmallVector<IdentifierInfo*, 32> Arguments;
1188 LexUnexpandedToken(Tok);
1189 switch (Tok.getKind()) {
1191 // Found the end of the argument list.
1192 if (Arguments.empty()) // #define FOO()
1194 // Otherwise we have #define FOO(A,)
1195 Diag(Tok, diag::err_pp_expected_ident_in_arg_list);
1197 case tok::ellipsis: // #define X(... -> C99 varargs
1198 // Warn if use of C99 feature in non-C99 mode.
1199 if (!Features.C99) Diag(Tok, diag::ext_variadic_macro);
1201 // Lex the token after the identifier.
1202 LexUnexpandedToken(Tok);
1203 if (Tok.isNot(tok::r_paren)) {
1204 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
1207 // Add the __VA_ARGS__ identifier as an argument.
1208 Arguments.push_back(Ident__VA_ARGS__);
1209 MI->setIsC99Varargs();
1210 MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
1212 case tok::eom: // #define X(
1213 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
1216 // Handle keywords and identifiers here to accept things like
1217 // #define Foo(for) for.
1218 IdentifierInfo *II = Tok.getIdentifierInfo();
1221 Diag(Tok, diag::err_pp_invalid_tok_in_arg_list);
1225 // If this is already used as an argument, it is used multiple times (e.g.
1227 if (std::find(Arguments.begin(), Arguments.end(), II) !=
1228 Arguments.end()) { // C99 6.10.3p6
1229 Diag(Tok, diag::err_pp_duplicate_name_in_arg_list) << II;
1233 // Add the argument to the macro info.
1234 Arguments.push_back(II);
1236 // Lex the token after the identifier.
1237 LexUnexpandedToken(Tok);
1239 switch (Tok.getKind()) {
1240 default: // #define X(A B
1241 Diag(Tok, diag::err_pp_expected_comma_in_arg_list);
1243 case tok::r_paren: // #define X(A)
1244 MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
1246 case tok::comma: // #define X(A,
1248 case tok::ellipsis: // #define X(A... -> GCC extension
1249 // Diagnose extension.
1250 Diag(Tok, diag::ext_named_variadic_macro);
1252 // Lex the token after the identifier.
1253 LexUnexpandedToken(Tok);
1254 if (Tok.isNot(tok::r_paren)) {
1255 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
1259 MI->setIsGNUVarargs();
1260 MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
1267 /// HandleDefineDirective - Implements #define. This consumes the entire macro
1268 /// line then lets the caller lex the next real token.
1269 void Preprocessor::HandleDefineDirective(Token &DefineTok) {
1273 ReadMacroName(MacroNameTok, 1);
1275 // Error reading macro name? If so, diagnostic already issued.
1276 if (MacroNameTok.is(tok::eom))
1279 Token LastTok = MacroNameTok;
1281 // If we are supposed to keep comments in #defines, reenable comment saving
1283 if (CurLexer) CurLexer->SetCommentRetentionState(KeepMacroComments);
1285 // Create the new macro.
1286 MacroInfo *MI = AllocateMacroInfo(MacroNameTok.getLocation());
1289 LexUnexpandedToken(Tok);
1291 // If this is a function-like macro definition, parse the argument list,
1292 // marking each of the identifiers as being used as macro arguments. Also,
1293 // check other constraints on the first token of the macro body.
1294 if (Tok.is(tok::eom)) {
1295 // If there is no body to this macro, we have no special handling here.
1296 } else if (Tok.hasLeadingSpace()) {
1297 // This is a normal token with leading space. Clear the leading space
1298 // marker on the first token to get proper expansion.
1299 Tok.clearFlag(Token::LeadingSpace);
1300 } else if (Tok.is(tok::l_paren)) {
1301 // This is a function-like macro definition. Read the argument list.
1302 MI->setIsFunctionLike();
1303 if (ReadMacroDefinitionArgList(MI)) {
1305 ReleaseMacroInfo(MI);
1306 // Throw away the rest of the line.
1307 if (CurPPLexer->ParsingPreprocessorDirective)
1308 DiscardUntilEndOfDirective();
1312 // If this is a definition of a variadic C99 function-like macro, not using
1313 // the GNU named varargs extension, enabled __VA_ARGS__.
1315 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro.
1316 // This gets unpoisoned where it is allowed.
1317 assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!");
1318 if (MI->isC99Varargs())
1319 Ident__VA_ARGS__->setIsPoisoned(false);
1321 // Read the first token after the arg list for down below.
1322 LexUnexpandedToken(Tok);
1323 } else if (Features.C99) {
1324 // C99 requires whitespace between the macro definition and the body. Emit
1325 // a diagnostic for something like "#define X+".
1326 Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name);
1328 // C90 6.8 TC1 says: "In the definition of an object-like macro, if the
1329 // first character of a replacement list is not a character required by
1330 // subclause 5.2.1, then there shall be white-space separation between the
1331 // identifier and the replacement list.". 5.2.1 lists this set:
1332 // "A-Za-z0-9!"#%&'()*+,_./:;<=>?[\]^_{|}~" as well as whitespace, which
1333 // is irrelevant here.
1334 bool isInvalid = false;
1335 if (Tok.is(tok::at)) // @ is not in the list above.
1337 else if (Tok.is(tok::unknown)) {
1338 // If we have an unknown token, it is something strange like "`". Since
1339 // all of valid characters would have lexed into a single character
1340 // token of some sort, we know this is not a valid case.
1344 Diag(Tok, diag::ext_missing_whitespace_after_macro_name);
1346 Diag(Tok, diag::warn_missing_whitespace_after_macro_name);
1349 if (!Tok.is(tok::eom))
1352 // Read the rest of the macro body.
1353 if (MI->isObjectLike()) {
1354 // Object-like macros are very simple, just read their body.
1355 while (Tok.isNot(tok::eom)) {
1357 MI->AddTokenToBody(Tok);
1358 // Get the next token of the macro.
1359 LexUnexpandedToken(Tok);
1363 // Otherwise, read the body of a function-like macro. While we are at it,
1364 // check C99 6.10.3.2p1: ensure that # operators are followed by macro
1365 // parameters in function-like macro expansions.
1366 while (Tok.isNot(tok::eom)) {
1369 if (Tok.isNot(tok::hash)) {
1370 MI->AddTokenToBody(Tok);
1372 // Get the next token of the macro.
1373 LexUnexpandedToken(Tok);
1377 // Get the next token of the macro.
1378 LexUnexpandedToken(Tok);
1380 // Check for a valid macro arg identifier.
1381 if (Tok.getIdentifierInfo() == 0 ||
1382 MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) {
1384 // If this is assembler-with-cpp mode, we accept random gibberish after
1385 // the '#' because '#' is often a comment character. However, change
1386 // the kind of the token to tok::unknown so that the preprocessor isn't
1388 if (getLangOptions().AsmPreprocessor && Tok.isNot(tok::eom)) {
1389 LastTok.setKind(tok::unknown);
1391 Diag(Tok, diag::err_pp_stringize_not_parameter);
1392 ReleaseMacroInfo(MI);
1394 // Disable __VA_ARGS__ again.
1395 Ident__VA_ARGS__->setIsPoisoned(true);
1400 // Things look ok, add the '#' and param name tokens to the macro.
1401 MI->AddTokenToBody(LastTok);
1402 MI->AddTokenToBody(Tok);
1405 // Get the next token of the macro.
1406 LexUnexpandedToken(Tok);
1411 // Disable __VA_ARGS__ again.
1412 Ident__VA_ARGS__->setIsPoisoned(true);
1414 // Check that there is no paste (##) operator at the begining or end of the
1415 // replacement list.
1416 unsigned NumTokens = MI->getNumTokens();
1417 if (NumTokens != 0) {
1418 if (MI->getReplacementToken(0).is(tok::hashhash)) {
1419 Diag(MI->getReplacementToken(0), diag::err_paste_at_start);
1420 ReleaseMacroInfo(MI);
1423 if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) {
1424 Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end);
1425 ReleaseMacroInfo(MI);
1430 // If this is the primary source file, remember that this macro hasn't been
1432 if (isInPrimaryFile())
1433 MI->setIsUsed(false);
1435 MI->setDefinitionEndLoc(LastTok.getLocation());
1437 // Finally, if this identifier already had a macro defined for it, verify that
1438 // the macro bodies are identical and free the old definition.
1439 if (MacroInfo *OtherMI = getMacroInfo(MacroNameTok.getIdentifierInfo())) {
1440 // It is very common for system headers to have tons of macro redefinitions
1441 // and for warnings to be disabled in system headers. If this is the case,
1442 // then don't bother calling MacroInfo::isIdenticalTo.
1443 if (!getDiagnostics().getSuppressSystemWarnings() ||
1444 !SourceMgr.isInSystemHeader(DefineTok.getLocation())) {
1445 if (!OtherMI->isUsed())
1446 Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used);
1448 // Macros must be identical. This means all tokes and whitespace
1449 // separation must be the same. C99 6.10.3.2.
1450 if (!MI->isIdenticalTo(*OtherMI, *this)) {
1451 Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef)
1452 << MacroNameTok.getIdentifierInfo();
1453 Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition);
1457 ReleaseMacroInfo(OtherMI);
1460 setMacroInfo(MacroNameTok.getIdentifierInfo(), MI);
1462 // If the callbacks want to know, tell them about the macro definition.
1464 Callbacks->MacroDefined(MacroNameTok.getIdentifierInfo(), MI);
1467 /// HandleUndefDirective - Implements #undef.
1469 void Preprocessor::HandleUndefDirective(Token &UndefTok) {
1473 ReadMacroName(MacroNameTok, 2);
1475 // Error reading macro name? If so, diagnostic already issued.
1476 if (MacroNameTok.is(tok::eom))
1479 // Check to see if this is the last token on the #undef line.
1480 CheckEndOfDirective("undef");
1482 // Okay, we finally have a valid identifier to undef.
1483 MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo());
1485 // If the macro is not defined, this is a noop undef, just return.
1486 if (MI == 0) return;
1489 Diag(MI->getDefinitionLoc(), diag::pp_macro_not_used);
1491 // If the callbacks want to know, tell them about the macro #undef.
1493 Callbacks->MacroUndefined(MacroNameTok.getIdentifierInfo(), MI);
1495 // Free macro definition.
1496 ReleaseMacroInfo(MI);
1497 setMacroInfo(MacroNameTok.getIdentifierInfo(), 0);
1501 //===----------------------------------------------------------------------===//
1502 // Preprocessor Conditional Directive Handling.
1503 //===----------------------------------------------------------------------===//
1505 /// HandleIfdefDirective - Implements the #ifdef/#ifndef directive. isIfndef is
1506 /// true when this is a #ifndef directive. ReadAnyTokensBeforeDirective is true
1507 /// if any tokens have been returned or pp-directives activated before this
1508 /// #ifndef has been lexed.
1510 void Preprocessor::HandleIfdefDirective(Token &Result, bool isIfndef,
1511 bool ReadAnyTokensBeforeDirective) {
1513 Token DirectiveTok = Result;
1516 ReadMacroName(MacroNameTok);
1518 // Error reading macro name? If so, diagnostic already issued.
1519 if (MacroNameTok.is(tok::eom)) {
1520 // Skip code until we get to #endif. This helps with recovery by not
1521 // emitting an error when the #endif is reached.
1522 SkipExcludedConditionalBlock(DirectiveTok.getLocation(),
1523 /*Foundnonskip*/false, /*FoundElse*/false);
1527 // Check to see if this is the last token on the #if[n]def line.
1528 CheckEndOfDirective(isIfndef ? "ifndef" : "ifdef");
1530 IdentifierInfo *MII = MacroNameTok.getIdentifierInfo();
1531 MacroInfo *MI = getMacroInfo(MII);
1533 if (CurPPLexer->getConditionalStackDepth() == 0) {
1534 // If the start of a top-level #ifdef and if the macro is not defined,
1535 // inform MIOpt that this might be the start of a proper include guard.
1536 // Otherwise it is some other form of unknown conditional which we can't
1538 if (!ReadAnyTokensBeforeDirective && MI == 0) {
1539 assert(isIfndef && "#ifdef shouldn't reach here");
1540 CurPPLexer->MIOpt.EnterTopLevelIFNDEF(MII);
1542 CurPPLexer->MIOpt.EnterTopLevelConditional();
1545 // If there is a macro, process it.
1546 if (MI) // Mark it used.
1547 MI->setIsUsed(true);
1549 // Should we include the stuff contained by this directive?
1550 if (!MI == isIfndef) {
1551 // Yes, remember that we are inside a conditional, then lex the next token.
1552 CurPPLexer->pushConditionalLevel(DirectiveTok.getLocation(),
1553 /*wasskip*/false, /*foundnonskip*/true,
1554 /*foundelse*/false);
1556 // No, skip the contents of this block and return the first token after it.
1557 SkipExcludedConditionalBlock(DirectiveTok.getLocation(),
1558 /*Foundnonskip*/false,
1559 /*FoundElse*/false);
1563 /// HandleIfDirective - Implements the #if directive.
1565 void Preprocessor::HandleIfDirective(Token &IfToken,
1566 bool ReadAnyTokensBeforeDirective) {
1569 // Parse and evaluation the conditional expression.
1570 IdentifierInfo *IfNDefMacro = 0;
1571 bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro);
1574 // If this condition is equivalent to #ifndef X, and if this is the first
1575 // directive seen, handle it for the multiple-include optimization.
1576 if (CurPPLexer->getConditionalStackDepth() == 0) {
1577 if (!ReadAnyTokensBeforeDirective && IfNDefMacro && ConditionalTrue)
1578 CurPPLexer->MIOpt.EnterTopLevelIFNDEF(IfNDefMacro);
1580 CurPPLexer->MIOpt.EnterTopLevelConditional();
1583 // Should we include the stuff contained by this directive?
1584 if (ConditionalTrue) {
1585 // Yes, remember that we are inside a conditional, then lex the next token.
1586 CurPPLexer->pushConditionalLevel(IfToken.getLocation(), /*wasskip*/false,
1587 /*foundnonskip*/true, /*foundelse*/false);
1589 // No, skip the contents of this block and return the first token after it.
1590 SkipExcludedConditionalBlock(IfToken.getLocation(), /*Foundnonskip*/false,
1591 /*FoundElse*/false);
1595 /// HandleEndifDirective - Implements the #endif directive.
1597 void Preprocessor::HandleEndifDirective(Token &EndifToken) {
1600 // Check that this is the whole directive.
1601 CheckEndOfDirective("endif");
1603 PPConditionalInfo CondInfo;
1604 if (CurPPLexer->popConditionalLevel(CondInfo)) {
1605 // No conditionals on the stack: this is an #endif without an #if.
1606 Diag(EndifToken, diag::err_pp_endif_without_if);
1610 // If this the end of a top-level #endif, inform MIOpt.
1611 if (CurPPLexer->getConditionalStackDepth() == 0)
1612 CurPPLexer->MIOpt.ExitTopLevelConditional();
1614 assert(!CondInfo.WasSkipping && !CurPPLexer->LexingRawMode &&
1615 "This code should only be reachable in the non-skipping case!");
1619 void Preprocessor::HandleElseDirective(Token &Result) {
1622 // #else directive in a non-skipping conditional... start skipping.
1623 CheckEndOfDirective("else");
1625 PPConditionalInfo CI;
1626 if (CurPPLexer->popConditionalLevel(CI)) {
1627 Diag(Result, diag::pp_err_else_without_if);
1631 // If this is a top-level #else, inform the MIOpt.
1632 if (CurPPLexer->getConditionalStackDepth() == 0)
1633 CurPPLexer->MIOpt.EnterTopLevelConditional();
1635 // If this is a #else with a #else before it, report the error.
1636 if (CI.FoundElse) Diag(Result, diag::pp_err_else_after_else);
1638 // Finally, skip the rest of the contents of this block and return the first
1640 return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true,
1644 void Preprocessor::HandleElifDirective(Token &ElifToken) {
1647 // #elif directive in a non-skipping conditional... start skipping.
1648 // We don't care what the condition is, because we will always skip it (since
1649 // the block immediately before it was included).
1650 DiscardUntilEndOfDirective();
1652 PPConditionalInfo CI;
1653 if (CurPPLexer->popConditionalLevel(CI)) {
1654 Diag(ElifToken, diag::pp_err_elif_without_if);
1658 // If this is a top-level #elif, inform the MIOpt.
1659 if (CurPPLexer->getConditionalStackDepth() == 0)
1660 CurPPLexer->MIOpt.EnterTopLevelConditional();
1662 // If this is a #elif with a #else before it, report the error.
1663 if (CI.FoundElse) Diag(ElifToken, diag::pp_err_elif_after_else);
1665 // Finally, skip the rest of the contents of this block and return the first
1667 return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true,
1668 /*FoundElse*/CI.FoundElse);