1 //===--- TokenLexer.cpp - Lex from a token stream -------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the TokenLexer interface.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Lex/TokenLexer.h"
15 #include "MacroArgs.h"
16 #include "clang/Lex/MacroInfo.h"
17 #include "clang/Lex/Preprocessor.h"
18 #include "clang/Basic/SourceManager.h"
19 #include "clang/Lex/LexDiagnostic.h"
20 #include "llvm/ADT/SmallVector.h"
21 using namespace clang;
24 /// Create a TokenLexer for the specified macro with the specified actual
25 /// arguments. Note that this ctor takes ownership of the ActualArgs pointer.
26 void TokenLexer::Init(Token &Tok, SourceLocation ELEnd, MacroArgs *Actuals) {
27 // If the client is reusing a TokenLexer, make sure to free any memory
28 // associated with it.
31 Macro = PP.getMacroInfo(Tok.getIdentifierInfo());
35 ExpandLocStart = Tok.getLocation();
37 AtStartOfLine = Tok.isAtStartOfLine();
38 HasLeadingSpace = Tok.hasLeadingSpace();
39 Tokens = &*Macro->tokens_begin();
41 DisableMacroExpansion = false;
42 NumTokens = Macro->tokens_end()-Macro->tokens_begin();
43 MacroExpansionStart = SourceLocation();
45 SourceManager &SM = PP.getSourceManager();
46 MacroStartSLocOffset = SM.getNextOffset();
49 assert(Tokens[0].getLocation().isValid());
50 assert((Tokens[0].getLocation().isFileID() || Tokens[0].is(tok::comment)) &&
51 "Macro defined in macro?");
52 assert(ExpandLocStart.isValid());
54 // Reserve a source location entry chunk for the length of the macro
55 // definition. Tokens that get lexed directly from the definition will
56 // have their locations pointing inside this chunk. This is to avoid
57 // creating separate source location entries for each token.
58 SourceLocation macroStart = SM.getInstantiationLoc(Tokens[0].getLocation());
59 MacroDefStartInfo = SM.getDecomposedLoc(macroStart);
60 MacroExpansionStart = SM.createInstantiationLoc(macroStart,
63 Macro->getDefinitionLength(SM));
66 // If this is a function-like macro, expand the arguments and change
67 // Tokens to point to the expanded tokens.
68 if (Macro->isFunctionLike() && Macro->getNumArgs())
69 ExpandFunctionArguments();
71 // Mark the macro as currently disabled, so that it is not recursively
72 // expanded. The macro must be disabled only after argument pre-expansion of
73 // function-like macro arguments occurs.
74 Macro->DisableMacro();
79 /// Create a TokenLexer for the specified token stream. This does not
80 /// take ownership of the specified token vector.
81 void TokenLexer::Init(const Token *TokArray, unsigned NumToks,
82 bool disableMacroExpansion, bool ownsTokens) {
83 // If the client is reusing a TokenLexer, make sure to free any memory
84 // associated with it.
90 OwnsTokens = ownsTokens;
91 DisableMacroExpansion = disableMacroExpansion;
94 ExpandLocStart = ExpandLocEnd = SourceLocation();
95 AtStartOfLine = false;
96 HasLeadingSpace = false;
97 MacroExpansionStart = SourceLocation();
99 // Set HasLeadingSpace/AtStartOfLine so that the first token will be
100 // returned unmodified.
102 AtStartOfLine = TokArray[0].isAtStartOfLine();
103 HasLeadingSpace = TokArray[0].hasLeadingSpace();
108 void TokenLexer::destroy() {
109 // If this was a function-like macro that actually uses its arguments, delete
110 // the expanded tokens.
117 // TokenLexer owns its formal arguments.
118 if (ActualArgs) ActualArgs->destroy(PP);
121 /// Expand the arguments of a function-like macro so that we can quickly
122 /// return preexpanded tokens from Tokens.
123 void TokenLexer::ExpandFunctionArguments() {
124 SourceManager &SM = PP.getSourceManager();
126 llvm::SmallVector<Token, 128> ResultToks;
128 // Loop through 'Tokens', expanding them into ResultToks. Keep
129 // track of whether we change anything. If not, no need to keep them. If so,
130 // we install the newly expanded sequence as the new 'Tokens' list.
131 bool MadeChange = false;
133 // NextTokGetsSpace - When this is true, the next token appended to the
134 // output list will get a leading space, regardless of whether it had one to
135 // begin with or not. This is used for placemarker support.
136 bool NextTokGetsSpace = false;
138 for (unsigned i = 0, e = NumTokens; i != e; ++i) {
139 // If we found the stringify operator, get the argument stringified. The
140 // preprocessor already verified that the following token is a macro name
141 // when the #define was parsed.
142 const Token &CurTok = Tokens[i];
143 if (CurTok.is(tok::hash) || CurTok.is(tok::hashat)) {
144 int ArgNo = Macro->getArgumentNum(Tokens[i+1].getIdentifierInfo());
145 assert(ArgNo != -1 && "Token following # is not an argument?");
147 SourceLocation hashInstLoc;
148 if(ExpandLocStart.isValid()) {
149 hashInstLoc = getMacroExpansionLocation(CurTok.getLocation());
150 assert(hashInstLoc.isValid() && "Expected '#' to come from definition");
154 if (CurTok.is(tok::hash)) // Stringify
155 Res = ActualArgs->getStringifiedArgument(ArgNo, PP, hashInstLoc);
157 // 'charify': don't bother caching these.
158 Res = MacroArgs::StringifyArgument(ActualArgs->getUnexpArgument(ArgNo),
159 PP, true, hashInstLoc);
162 // The stringified/charified string leading space flag gets set to match
163 // the #/#@ operator.
164 if (CurTok.hasLeadingSpace() || NextTokGetsSpace)
165 Res.setFlag(Token::LeadingSpace);
167 ResultToks.push_back(Res);
169 ++i; // Skip arg name.
170 NextTokGetsSpace = false;
174 // Otherwise, if this is not an argument token, just add the token to the
176 IdentifierInfo *II = CurTok.getIdentifierInfo();
177 int ArgNo = II ? Macro->getArgumentNum(II) : -1;
179 // This isn't an argument, just add it.
180 ResultToks.push_back(CurTok);
182 if (NextTokGetsSpace) {
183 ResultToks.back().setFlag(Token::LeadingSpace);
184 NextTokGetsSpace = false;
189 // An argument is expanded somehow, the result is different than the
193 // Otherwise, this is a use of the argument. Find out if there is a paste
194 // (##) operator before or after the argument.
196 !ResultToks.empty() && ResultToks.back().is(tok::hashhash);
197 bool PasteAfter = i+1 != e && Tokens[i+1].is(tok::hashhash);
199 // If it is not the LHS/RHS of a ## operator, we must pre-expand the
200 // argument and substitute the expanded tokens into the result. This is
202 if (!PasteBefore && !PasteAfter) {
203 const Token *ResultArgToks;
205 // Only preexpand the argument if it could possibly need it. This
206 // avoids some work in common cases.
207 const Token *ArgTok = ActualArgs->getUnexpArgument(ArgNo);
208 if (ActualArgs->ArgNeedsPreexpansion(ArgTok, PP))
209 ResultArgToks = &ActualArgs->getPreExpArgument(ArgNo, Macro, PP)[0];
211 ResultArgToks = ArgTok; // Use non-preexpanded tokens.
213 // If the arg token expanded into anything, append it.
214 if (ResultArgToks->isNot(tok::eof)) {
215 unsigned FirstResult = ResultToks.size();
216 unsigned NumToks = MacroArgs::getArgLength(ResultArgToks);
217 ResultToks.append(ResultArgToks, ResultArgToks+NumToks);
219 // If the '##' came from expanding an argument, turn it into 'unknown'
221 for (unsigned i = FirstResult, e = ResultToks.size(); i != e; ++i) {
222 Token &Tok = ResultToks[i];
223 if (Tok.is(tok::hashhash))
224 Tok.setKind(tok::unknown);
227 if(ExpandLocStart.isValid()) {
228 SourceLocation curInst =
229 getMacroExpansionLocation(CurTok.getLocation());
230 assert(curInst.isValid() &&
231 "Expected arg identifier to come from definition");
232 for (unsigned i = FirstResult, e = ResultToks.size(); i != e; ++i) {
233 Token &Tok = ResultToks[i];
234 Tok.setLocation(SM.createMacroArgInstantiationLoc(Tok.getLocation(),
240 // If any tokens were substituted from the argument, the whitespace
241 // before the first token should match the whitespace of the arg
243 ResultToks[FirstResult].setFlagValue(Token::LeadingSpace,
244 CurTok.hasLeadingSpace() ||
246 NextTokGetsSpace = false;
248 // If this is an empty argument, and if there was whitespace before the
249 // formal token, make sure the next token gets whitespace before it.
250 NextTokGetsSpace = CurTok.hasLeadingSpace();
255 // Okay, we have a token that is either the LHS or RHS of a paste (##)
256 // argument. It gets substituted as its non-pre-expanded tokens.
257 const Token *ArgToks = ActualArgs->getUnexpArgument(ArgNo);
258 unsigned NumToks = MacroArgs::getArgLength(ArgToks);
259 if (NumToks) { // Not an empty argument?
260 // If this is the GNU ", ## __VA_ARG__" extension, and we just learned
261 // that __VA_ARG__ expands to multiple tokens, avoid a pasting error when
262 // the expander trys to paste ',' with the first token of the __VA_ARG__
264 if (PasteBefore && ResultToks.size() >= 2 &&
265 ResultToks[ResultToks.size()-2].is(tok::comma) &&
266 (unsigned)ArgNo == Macro->getNumArgs()-1 &&
267 Macro->isVariadic()) {
268 // Remove the paste operator, report use of the extension.
269 PP.Diag(ResultToks.back().getLocation(), diag::ext_paste_comma);
270 ResultToks.pop_back();
273 ResultToks.append(ArgToks, ArgToks+NumToks);
275 // If the '##' came from expanding an argument, turn it into 'unknown'
277 for (unsigned i = ResultToks.size() - NumToks, e = ResultToks.size();
279 Token &Tok = ResultToks[i];
280 if (Tok.is(tok::hashhash))
281 Tok.setKind(tok::unknown);
284 if (ExpandLocStart.isValid()) {
285 SourceLocation curInst =
286 getMacroExpansionLocation(CurTok.getLocation());
287 assert(curInst.isValid() &&
288 "Expected arg identifier to come from definition");
289 for (unsigned i = ResultToks.size() - NumToks, e = ResultToks.size();
291 Token &Tok = ResultToks[i];
292 Tok.setLocation(SM.createMacroArgInstantiationLoc(Tok.getLocation(),
298 // If this token (the macro argument) was supposed to get leading
299 // whitespace, transfer this information onto the first token of the
302 // Do not do this if the paste operator occurs before the macro argument,
303 // as in "A ## MACROARG". In valid code, the first token will get
304 // smooshed onto the preceding one anyway (forming AMACROARG). In
305 // assembler-with-cpp mode, invalid pastes are allowed through: in this
306 // case, we do not want the extra whitespace to be added. For example,
307 // we want ". ## foo" -> ".foo" not ". foo".
308 if ((CurTok.hasLeadingSpace() || NextTokGetsSpace) &&
310 ResultToks[ResultToks.size()-NumToks].setFlag(Token::LeadingSpace);
312 NextTokGetsSpace = false;
316 // If an empty argument is on the LHS or RHS of a paste, the standard (C99
317 // 6.10.3.3p2,3) calls for a bunch of placemarker stuff to occur. We
318 // implement this by eating ## operators when a LHS or RHS expands to
320 NextTokGetsSpace |= CurTok.hasLeadingSpace();
322 // Discard the argument token and skip (don't copy to the expansion
323 // buffer) the paste operator after it.
324 NextTokGetsSpace |= Tokens[i+1].hasLeadingSpace();
329 // If this is on the RHS of a paste operator, we've already copied the
330 // paste operator to the ResultToks list. Remove it.
331 assert(PasteBefore && ResultToks.back().is(tok::hashhash));
332 NextTokGetsSpace |= ResultToks.back().hasLeadingSpace();
333 ResultToks.pop_back();
335 // If this is the __VA_ARGS__ token, and if the argument wasn't provided,
336 // and if the macro had at least one real argument, and if the token before
337 // the ## was a comma, remove the comma.
338 if ((unsigned)ArgNo == Macro->getNumArgs()-1 && // is __VA_ARGS__
339 ActualArgs->isVarargsElidedUse() && // Argument elided.
340 !ResultToks.empty() && ResultToks.back().is(tok::comma)) {
341 // Never add a space, even if the comma, ##, or arg had a space.
342 NextTokGetsSpace = false;
343 // Remove the paste operator, report use of the extension.
344 PP.Diag(ResultToks.back().getLocation(), diag::ext_paste_comma);
345 ResultToks.pop_back();
347 // If the comma was right after another paste (e.g. "X##,##__VA_ARGS__"),
348 // then removal of the comma should produce a placemarker token (in C99
349 // terms) which we model by popping off the previous ##, giving us a plain
350 // "X" when __VA_ARGS__ is empty.
351 if (!ResultToks.empty() && ResultToks.back().is(tok::hashhash))
352 ResultToks.pop_back();
357 // If anything changed, install this as the new Tokens list.
359 assert(!OwnsTokens && "This would leak if we already own the token list");
360 // This is deleted in the dtor.
361 NumTokens = ResultToks.size();
362 // The tokens will be added to Preprocessor's cache and will be removed
363 // when this TokenLexer finishes lexing them.
364 Tokens = PP.cacheMacroExpandedTokens(this, ResultToks);
366 // The preprocessor cache of macro expanded tokens owns these tokens,not us.
371 /// Lex - Lex and return a token from this macro stream.
373 void TokenLexer::Lex(Token &Tok) {
374 // Lexing off the end of the macro, pop this macro off the expansion stack.
376 // If this is a macro (not a token stream), mark the macro enabled now
377 // that it is no longer being expanded.
378 if (Macro) Macro->EnableMacro();
380 // Pop this context off the preprocessors lexer stack and get the next
381 // token. This will delete "this" so remember the PP instance var.
382 Preprocessor &PPCache = PP;
383 if (PP.HandleEndOfTokenLexer(Tok))
386 // HandleEndOfTokenLexer may not return a token. If it doesn't, lex
388 return PPCache.Lex(Tok);
391 SourceManager &SM = PP.getSourceManager();
393 // If this is the first token of the expanded result, we inherit spacing
395 bool isFirstToken = CurToken == 0;
397 // Get the next token to return.
398 Tok = Tokens[CurToken++];
400 bool TokenIsFromPaste = false;
402 // If this token is followed by a token paste (##) operator, paste the tokens!
403 // Note that ## is a normal token when not expanding a macro.
404 if (!isAtEnd() && Tokens[CurToken].is(tok::hashhash) && Macro) {
405 // When handling the microsoft /##/ extension, the final token is
406 // returned by PasteTokens, not the pasted token.
407 if (PasteTokens(Tok))
410 TokenIsFromPaste = true;
413 // The token's current location indicate where the token was lexed from. We
414 // need this information to compute the spelling of the token, but any
415 // diagnostics for the expanded token should appear as if they came from
416 // ExpansionLoc. Pull this information together into a new SourceLocation
417 // that captures all of this.
418 if (ExpandLocStart.isValid() && // Don't do this for token streams.
419 // Check that the token's location was not already set properly.
420 SM.isBeforeInSourceLocationOffset(Tok.getLocation(),
421 MacroStartSLocOffset)) {
422 SourceLocation instLoc;
423 if (Tok.is(tok::comment)) {
424 instLoc = SM.createInstantiationLoc(Tok.getLocation(),
429 instLoc = getMacroExpansionLocation(Tok.getLocation());
430 assert(instLoc.isValid() &&
431 "Location for token not coming from definition was not set!");
434 Tok.setLocation(instLoc);
437 // If this is the first token, set the lexical properties of the token to
438 // match the lexical properties of the macro identifier.
440 Tok.setFlagValue(Token::StartOfLine , AtStartOfLine);
441 Tok.setFlagValue(Token::LeadingSpace, HasLeadingSpace);
444 // Handle recursive expansion!
445 if (!Tok.isAnnotation() && Tok.getIdentifierInfo() != 0) {
446 // Change the kind of this identifier to the appropriate token kind, e.g.
447 // turning "for" into a keyword.
448 IdentifierInfo *II = Tok.getIdentifierInfo();
449 Tok.setKind(II->getTokenID());
451 // If this identifier was poisoned and from a paste, emit an error. This
452 // won't be handled by Preprocessor::HandleIdentifier because this is coming
453 // from a macro expansion.
454 if (II->isPoisoned() && TokenIsFromPaste) {
455 PP.HandlePoisonedIdentifier(Tok);
458 if (!DisableMacroExpansion && II->isHandleIdentifierCase())
459 PP.HandleIdentifier(Tok);
462 // Otherwise, return a normal token.
465 /// PasteTokens - Tok is the LHS of a ## operator, and CurToken is the ##
466 /// operator. Read the ## and RHS, and paste the LHS/RHS together. If there
467 /// are more ## after it, chomp them iteratively. Return the result as Tok.
468 /// If this returns true, the caller should immediately return the token.
469 bool TokenLexer::PasteTokens(Token &Tok) {
470 llvm::SmallString<128> Buffer;
471 const char *ResultTokStrPtr = 0;
472 SourceLocation PasteOpLoc;
474 // Consume the ## operator.
475 PasteOpLoc = Tokens[CurToken].getLocation();
477 assert(!isAtEnd() && "No token on the RHS of a paste operator!");
479 // Get the RHS token.
480 const Token &RHS = Tokens[CurToken];
482 // Allocate space for the result token. This is guaranteed to be enough for
484 Buffer.resize(Tok.getLength() + RHS.getLength());
486 // Get the spelling of the LHS token in Buffer.
487 const char *BufPtr = &Buffer[0];
488 bool Invalid = false;
489 unsigned LHSLen = PP.getSpelling(Tok, BufPtr, &Invalid);
490 if (BufPtr != &Buffer[0]) // Really, we want the chars in Buffer!
491 memcpy(&Buffer[0], BufPtr, LHSLen);
495 BufPtr = &Buffer[LHSLen];
496 unsigned RHSLen = PP.getSpelling(RHS, BufPtr, &Invalid);
499 if (BufPtr != &Buffer[LHSLen]) // Really, we want the chars in Buffer!
500 memcpy(&Buffer[LHSLen], BufPtr, RHSLen);
502 // Trim excess space.
503 Buffer.resize(LHSLen+RHSLen);
505 // Plop the pasted result (including the trailing newline and null) into a
506 // scratch buffer where we can lex it.
508 ResultTokTmp.startToken();
510 // Claim that the tmp token is a string_literal so that we can get the
511 // character pointer back from CreateString in getLiteralData().
512 ResultTokTmp.setKind(tok::string_literal);
513 PP.CreateString(&Buffer[0], Buffer.size(), ResultTokTmp);
514 SourceLocation ResultTokLoc = ResultTokTmp.getLocation();
515 ResultTokStrPtr = ResultTokTmp.getLiteralData();
517 // Lex the resultant pasted token into Result.
520 if (Tok.isAnyIdentifier() && RHS.isAnyIdentifier()) {
521 // Common paste case: identifier+identifier = identifier. Avoid creating
522 // a lexer and other overhead.
523 PP.IncrementPasteCounter(true);
525 Result.setKind(tok::raw_identifier);
526 Result.setRawIdentifierData(ResultTokStrPtr);
527 Result.setLocation(ResultTokLoc);
528 Result.setLength(LHSLen+RHSLen);
530 PP.IncrementPasteCounter(false);
532 assert(ResultTokLoc.isFileID() &&
533 "Should be a raw location into scratch buffer");
534 SourceManager &SourceMgr = PP.getSourceManager();
535 FileID LocFileID = SourceMgr.getFileID(ResultTokLoc);
537 bool Invalid = false;
538 const char *ScratchBufStart
539 = SourceMgr.getBufferData(LocFileID, &Invalid).data();
543 // Make a lexer to lex this string from. Lex just this one token.
544 // Make a lexer object so that we lex and expand the paste result.
545 Lexer TL(SourceMgr.getLocForStartOfFile(LocFileID),
546 PP.getLangOptions(), ScratchBufStart,
547 ResultTokStrPtr, ResultTokStrPtr+LHSLen+RHSLen);
549 // Lex a token in raw mode. This way it won't look up identifiers
550 // automatically, lexing off the end will return an eof token, and
551 // warnings are disabled. This returns true if the result token is the
553 bool isInvalid = !TL.LexFromRawLexer(Result);
555 // If we got an EOF token, we didn't form even ONE token. For example, we
556 // did "/ ## /" to get "//".
557 isInvalid |= Result.is(tok::eof);
559 // If pasting the two tokens didn't form a full new token, this is an
560 // error. This occurs with "x ## +" and other stuff. Return with Tok
561 // unmodified and with RHS as the next token to lex.
563 // Test for the Microsoft extension of /##/ turning into // here on the
565 if (PP.getLangOptions().Microsoft && Tok.is(tok::slash) &&
566 RHS.is(tok::slash)) {
567 HandleMicrosoftCommentPaste(Tok);
571 // Do not emit the error when preprocessing assembler code.
572 if (!PP.getLangOptions().AsmPreprocessor) {
573 // Explicitly convert the token location to have proper expansion
574 // information so that the user knows where it came from.
575 SourceManager &SM = PP.getSourceManager();
577 SM.createInstantiationLoc(PasteOpLoc, ExpandLocStart,
579 // If we're in microsoft extensions mode, downgrade this from a hard
580 // error to a warning that defaults to an error. This allows
583 PP.getLangOptions().Microsoft ? diag::err_pp_bad_paste_ms
584 : diag::err_pp_bad_paste)
588 // Do not consume the RHS.
592 // Turn ## into 'unknown' to avoid # ## # from looking like a paste
594 if (Result.is(tok::hashhash))
595 Result.setKind(tok::unknown);
598 // Transfer properties of the LHS over the the Result.
599 Result.setFlagValue(Token::StartOfLine , Tok.isAtStartOfLine());
600 Result.setFlagValue(Token::LeadingSpace, Tok.hasLeadingSpace());
602 // Finally, replace LHS with the result, consume the RHS, and iterate.
605 } while (!isAtEnd() && Tokens[CurToken].is(tok::hashhash));
607 // The token's current location indicate where the token was lexed from. We
608 // need this information to compute the spelling of the token, but any
609 // diagnostics for the expanded token should appear as if the token was
610 // expanded from the (##) operator. Pull this information together into
611 // a new SourceLocation that captures all of this.
612 if (ExpandLocStart.isValid()) {
613 SourceManager &SM = PP.getSourceManager();
614 SourceLocation pasteLocInst =
615 getMacroExpansionLocation(PasteOpLoc);
616 assert(pasteLocInst.isValid() &&
617 "Expected '##' to come from definition");
619 Tok.setLocation(SM.createInstantiationLoc(Tok.getLocation(),
625 // Now that we got the result token, it will be subject to expansion. Since
626 // token pasting re-lexes the result token in raw mode, identifier information
627 // isn't looked up. As such, if the result is an identifier, look up id info.
628 if (Tok.is(tok::raw_identifier)) {
629 // Look up the identifier info for the token. We disabled identifier lookup
630 // by saying we're skipping contents, so we need to do this manually.
631 PP.LookUpIdentifierInfo(Tok);
636 /// isNextTokenLParen - If the next token lexed will pop this macro off the
637 /// expansion stack, return 2. If the next unexpanded token is a '(', return
638 /// 1, otherwise return 0.
639 unsigned TokenLexer::isNextTokenLParen() const {
643 return Tokens[CurToken].is(tok::l_paren);
646 /// isParsingPreprocessorDirective - Return true if we are in the middle of a
647 /// preprocessor directive.
648 bool TokenLexer::isParsingPreprocessorDirective() const {
649 return Tokens[NumTokens-1].is(tok::eod) && !isAtEnd();
652 /// HandleMicrosoftCommentPaste - In microsoft compatibility mode, /##/ pastes
653 /// together to form a comment that comments out everything in the current
654 /// macro, other active macros, and anything left on the current physical
655 /// source line of the expanded buffer. Handle this by returning the
656 /// first token on the next line.
657 void TokenLexer::HandleMicrosoftCommentPaste(Token &Tok) {
658 // We 'comment out' the rest of this macro by just ignoring the rest of the
659 // tokens that have not been lexed yet, if any.
661 // Since this must be a macro, mark the macro enabled now that it is no longer
663 assert(Macro && "Token streams can't paste comments");
664 Macro->EnableMacro();
666 PP.HandleMicrosoftCommentPaste(Tok);
669 /// \brief If \arg loc is a FileID and points inside the current macro
670 /// definition, returns the appropriate source location pointing at the
671 /// macro expansion source location entry.
672 SourceLocation TokenLexer::getMacroExpansionLocation(SourceLocation loc) const {
673 assert(ExpandLocStart.isValid() && MacroExpansionStart.isValid() &&
674 "Not appropriate for token streams");
675 assert(loc.isValid());
677 SourceManager &SM = PP.getSourceManager();
678 unsigned relativeOffset;
679 if (loc.isFileID() &&
681 MacroDefStartInfo.first, MacroDefStartInfo.second,
682 Macro->getDefinitionLength(SM), &relativeOffset)) {
683 return MacroExpansionStart.getFileLocWithOffset(relativeOffset);
686 return SourceLocation();