PPDirectives.cpp revision e26224e61c8a3b607c73c52f2cd0344065d7b412
1//===--- PPDirectives.cpp - Directive Handling for Preprocessor -----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements # directive processing for the Preprocessor. 11// 12//===----------------------------------------------------------------------===// 13 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/Lex/CodeCompletionHandler.h" 20#include "clang/Lex/Pragma.h" 21#include "clang/Basic/FileManager.h" 22#include "clang/Basic/SourceManager.h" 23#include "llvm/ADT/APInt.h" 24using namespace clang; 25 26//===----------------------------------------------------------------------===// 27// Utility Methods for Preprocessor Directive Handling. 28//===----------------------------------------------------------------------===// 29 30MacroInfo *Preprocessor::AllocateMacroInfo() { 31 MacroInfoChain *MIChain; 32 33 if (MICache) { 34 MIChain = MICache; 35 MICache = MICache->Next; 36 } 37 else { 38 MIChain = BP.Allocate<MacroInfoChain>(); 39 } 40 41 MIChain->Next = MIChainHead; 42 MIChain->Prev = 0; 43 if (MIChainHead) 44 MIChainHead->Prev = MIChain; 45 MIChainHead = MIChain; 46 47 return &(MIChain->MI); 48} 49 50MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) { 51 MacroInfo *MI = AllocateMacroInfo(); 52 new (MI) MacroInfo(L); 53 return MI; 54} 55 56MacroInfo *Preprocessor::CloneMacroInfo(const MacroInfo &MacroToClone) { 57 MacroInfo *MI = AllocateMacroInfo(); 58 new (MI) MacroInfo(MacroToClone, BP); 59 return MI; 60} 61 62/// ReleaseMacroInfo - Release the specified MacroInfo. This memory will 63/// be reused for allocating new MacroInfo objects. 64void Preprocessor::ReleaseMacroInfo(MacroInfo *MI) { 65 MacroInfoChain *MIChain = (MacroInfoChain*) MI; 66 if (MacroInfoChain *Prev = MIChain->Prev) { 67 MacroInfoChain *Next = MIChain->Next; 68 Prev->Next = Next; 69 if (Next) 70 Next->Prev = Prev; 71 } 72 else { 73 assert(MIChainHead == MIChain); 74 MIChainHead = MIChain->Next; 75 MIChainHead->Prev = 0; 76 } 77 MIChain->Next = MICache; 78 MICache = MIChain; 79 80 MI->Destroy(); 81} 82 83/// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the 84/// current line until the tok::eod token is found. 85void Preprocessor::DiscardUntilEndOfDirective() { 86 Token Tmp; 87 do { 88 LexUnexpandedToken(Tmp); 89 assert(Tmp.isNot(tok::eof) && "EOF seen while discarding directive tokens"); 90 } while (Tmp.isNot(tok::eod)); 91} 92 93/// ReadMacroName - Lex and validate a macro name, which occurs after a 94/// #define or #undef. This sets the token kind to eod and discards the rest 95/// of the macro line if the macro name is invalid. isDefineUndef is 1 if 96/// this is due to a a #define, 2 if #undef directive, 0 if it is something 97/// else (e.g. #ifdef). 98void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) { 99 // Read the token, don't allow macro expansion on it. 100 LexUnexpandedToken(MacroNameTok); 101 102 if (MacroNameTok.is(tok::code_completion)) { 103 if (CodeComplete) 104 CodeComplete->CodeCompleteMacroName(isDefineUndef == 1); 105 LexUnexpandedToken(MacroNameTok); 106 return; 107 } 108 109 // Missing macro name? 110 if (MacroNameTok.is(tok::eod)) { 111 Diag(MacroNameTok, diag::err_pp_missing_macro_name); 112 return; 113 } 114 115 IdentifierInfo *II = MacroNameTok.getIdentifierInfo(); 116 if (II == 0) { 117 bool Invalid = false; 118 std::string Spelling = getSpelling(MacroNameTok, &Invalid); 119 if (Invalid) 120 return; 121 122 const IdentifierInfo &Info = Identifiers.get(Spelling); 123 if (Info.isCPlusPlusOperatorKeyword()) 124 // C++ 2.5p2: Alternative tokens behave the same as its primary token 125 // except for their spellings. 126 Diag(MacroNameTok, diag::err_pp_operator_used_as_macro_name) << Spelling; 127 else 128 Diag(MacroNameTok, diag::err_pp_macro_not_identifier); 129 // Fall through on error. 130 } else if (isDefineUndef && II->getPPKeywordID() == tok::pp_defined) { 131 // Error if defining "defined": C99 6.10.8.4. 132 Diag(MacroNameTok, diag::err_defined_macro_name); 133 } else if (isDefineUndef && II->hasMacroDefinition() && 134 getMacroInfo(II)->isBuiltinMacro()) { 135 // Error if defining "__LINE__" and other builtins: C99 6.10.8.4. 136 if (isDefineUndef == 1) 137 Diag(MacroNameTok, diag::pp_redef_builtin_macro); 138 else 139 Diag(MacroNameTok, diag::pp_undef_builtin_macro); 140 } else { 141 // Okay, we got a good identifier node. Return it. 142 return; 143 } 144 145 // Invalid macro name, read and discard the rest of the line. Then set the 146 // token kind to tok::eod. 147 MacroNameTok.setKind(tok::eod); 148 return DiscardUntilEndOfDirective(); 149} 150 151/// CheckEndOfDirective - Ensure that the next token is a tok::eod token. If 152/// not, emit a diagnostic and consume up until the eod. If EnableMacros is 153/// true, then we consider macros that expand to zero tokens as being ok. 154void Preprocessor::CheckEndOfDirective(const char *DirType, bool EnableMacros) { 155 Token Tmp; 156 // Lex unexpanded tokens for most directives: macros might expand to zero 157 // tokens, causing us to miss diagnosing invalid lines. Some directives (like 158 // #line) allow empty macros. 159 if (EnableMacros) 160 Lex(Tmp); 161 else 162 LexUnexpandedToken(Tmp); 163 164 // There should be no tokens after the directive, but we allow them as an 165 // extension. 166 while (Tmp.is(tok::comment)) // Skip comments in -C mode. 167 LexUnexpandedToken(Tmp); 168 169 if (Tmp.isNot(tok::eod)) { 170 // Add a fixit in GNU/C99/C++ mode. Don't offer a fixit for strict-C89, 171 // or if this is a macro-style preprocessing directive, because it is more 172 // trouble than it is worth to insert /**/ and check that there is no /**/ 173 // in the range also. 174 FixItHint Hint; 175 if ((Features.GNUMode || Features.C99 || Features.CPlusPlus) && 176 !CurTokenLexer) 177 Hint = FixItHint::CreateInsertion(Tmp.getLocation(),"//"); 178 Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType << Hint; 179 DiscardUntilEndOfDirective(); 180 } 181} 182 183 184 185/// SkipExcludedConditionalBlock - We just read a #if or related directive and 186/// decided that the subsequent tokens are in the #if'd out portion of the 187/// file. Lex the rest of the file, until we see an #endif. If 188/// FoundNonSkipPortion is true, then we have already emitted code for part of 189/// this #if directive, so #else/#elif blocks should never be entered. If ElseOk 190/// is true, then #else directives are ok, if not, then we have already seen one 191/// so a #else directive is a duplicate. When this returns, the caller can lex 192/// the first valid token. 193void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc, 194 bool FoundNonSkipPortion, 195 bool FoundElse) { 196 ++NumSkipped; 197 assert(CurTokenLexer == 0 && CurPPLexer && "Lexing a macro, not a file?"); 198 199 CurPPLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false, 200 FoundNonSkipPortion, FoundElse); 201 202 if (CurPTHLexer) { 203 PTHSkipExcludedConditionalBlock(); 204 return; 205 } 206 207 // Enter raw mode to disable identifier lookup (and thus macro expansion), 208 // disabling warnings, etc. 209 CurPPLexer->LexingRawMode = true; 210 Token Tok; 211 while (1) { 212 CurLexer->Lex(Tok); 213 214 if (Tok.is(tok::code_completion)) { 215 if (CodeComplete) 216 CodeComplete->CodeCompleteInConditionalExclusion(); 217 continue; 218 } 219 220 // If this is the end of the buffer, we have an error. 221 if (Tok.is(tok::eof)) { 222 // Emit errors for each unterminated conditional on the stack, including 223 // the current one. 224 while (!CurPPLexer->ConditionalStack.empty()) { 225 if (!isCodeCompletionFile(Tok.getLocation())) 226 Diag(CurPPLexer->ConditionalStack.back().IfLoc, 227 diag::err_pp_unterminated_conditional); 228 CurPPLexer->ConditionalStack.pop_back(); 229 } 230 231 // Just return and let the caller lex after this #include. 232 break; 233 } 234 235 // If this token is not a preprocessor directive, just skip it. 236 if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine()) 237 continue; 238 239 // We just parsed a # character at the start of a line, so we're in 240 // directive mode. Tell the lexer this so any newlines we see will be 241 // converted into an EOD token (this terminates the macro). 242 CurPPLexer->ParsingPreprocessorDirective = true; 243 if (CurLexer) CurLexer->SetCommentRetentionState(false); 244 245 246 // Read the next token, the directive flavor. 247 LexUnexpandedToken(Tok); 248 249 // If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or 250 // something bogus), skip it. 251 if (Tok.isNot(tok::raw_identifier)) { 252 CurPPLexer->ParsingPreprocessorDirective = false; 253 // Restore comment saving mode. 254 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 255 continue; 256 } 257 258 // If the first letter isn't i or e, it isn't intesting to us. We know that 259 // this is safe in the face of spelling differences, because there is no way 260 // to spell an i/e in a strange way that is another letter. Skipping this 261 // allows us to avoid looking up the identifier info for #define/#undef and 262 // other common directives. 263 const char *RawCharData = Tok.getRawIdentifierData(); 264 265 char FirstChar = RawCharData[0]; 266 if (FirstChar >= 'a' && FirstChar <= 'z' && 267 FirstChar != 'i' && FirstChar != 'e') { 268 CurPPLexer->ParsingPreprocessorDirective = false; 269 // Restore comment saving mode. 270 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 271 continue; 272 } 273 274 // Get the identifier name without trigraphs or embedded newlines. Note 275 // that we can't use Tok.getIdentifierInfo() because its lookup is disabled 276 // when skipping. 277 char DirectiveBuf[20]; 278 llvm::StringRef Directive; 279 if (!Tok.needsCleaning() && Tok.getLength() < 20) { 280 Directive = llvm::StringRef(RawCharData, Tok.getLength()); 281 } else { 282 std::string DirectiveStr = getSpelling(Tok); 283 unsigned IdLen = DirectiveStr.size(); 284 if (IdLen >= 20) { 285 CurPPLexer->ParsingPreprocessorDirective = false; 286 // Restore comment saving mode. 287 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 288 continue; 289 } 290 memcpy(DirectiveBuf, &DirectiveStr[0], IdLen); 291 Directive = llvm::StringRef(DirectiveBuf, IdLen); 292 } 293 294 if (Directive.startswith("if")) { 295 llvm::StringRef Sub = Directive.substr(2); 296 if (Sub.empty() || // "if" 297 Sub == "def" || // "ifdef" 298 Sub == "ndef") { // "ifndef" 299 // We know the entire #if/#ifdef/#ifndef block will be skipped, don't 300 // bother parsing the condition. 301 DiscardUntilEndOfDirective(); 302 CurPPLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true, 303 /*foundnonskip*/false, 304 /*foundelse*/false); 305 306 if (Callbacks) 307 Callbacks->Endif(); 308 } 309 } else if (Directive[0] == 'e') { 310 llvm::StringRef Sub = Directive.substr(1); 311 if (Sub == "ndif") { // "endif" 312 CheckEndOfDirective("endif"); 313 PPConditionalInfo CondInfo; 314 CondInfo.WasSkipping = true; // Silence bogus warning. 315 bool InCond = CurPPLexer->popConditionalLevel(CondInfo); 316 (void)InCond; // Silence warning in no-asserts mode. 317 assert(!InCond && "Can't be skipping if not in a conditional!"); 318 319 // If we popped the outermost skipping block, we're done skipping! 320 if (!CondInfo.WasSkipping) 321 break; 322 } else if (Sub == "lse") { // "else". 323 // #else directive in a skipping conditional. If not in some other 324 // skipping conditional, and if #else hasn't already been seen, enter it 325 // as a non-skipping conditional. 326 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel(); 327 328 // If this is a #else with a #else before it, report the error. 329 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else); 330 331 // Note that we've seen a #else in this conditional. 332 CondInfo.FoundElse = true; 333 334 if (Callbacks) 335 Callbacks->Else(); 336 337 // If the conditional is at the top level, and the #if block wasn't 338 // entered, enter the #else block now. 339 if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) { 340 CondInfo.FoundNonSkip = true; 341 CheckEndOfDirective("else"); 342 break; 343 } else { 344 DiscardUntilEndOfDirective(); // C99 6.10p4. 345 } 346 } else if (Sub == "lif") { // "elif". 347 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel(); 348 349 bool ShouldEnter; 350 const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation(); 351 // If this is in a skipping block or if we're already handled this #if 352 // block, don't bother parsing the condition. 353 if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) { 354 DiscardUntilEndOfDirective(); 355 ShouldEnter = false; 356 } else { 357 // Restore the value of LexingRawMode so that identifiers are 358 // looked up, etc, inside the #elif expression. 359 assert(CurPPLexer->LexingRawMode && "We have to be skipping here!"); 360 CurPPLexer->LexingRawMode = false; 361 IdentifierInfo *IfNDefMacro = 0; 362 ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro); 363 CurPPLexer->LexingRawMode = true; 364 } 365 const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation(); 366 367 // If this is a #elif with a #else before it, report the error. 368 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else); 369 370 if (Callbacks) 371 Callbacks->Elif(SourceRange(ConditionalBegin, ConditionalEnd)); 372 373 // If this condition is true, enter it! 374 if (ShouldEnter) { 375 CondInfo.FoundNonSkip = true; 376 break; 377 } 378 } 379 } 380 381 CurPPLexer->ParsingPreprocessorDirective = false; 382 // Restore comment saving mode. 383 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 384 } 385 386 // Finally, if we are out of the conditional (saw an #endif or ran off the end 387 // of the file, just stop skipping and return to lexing whatever came after 388 // the #if block. 389 CurPPLexer->LexingRawMode = false; 390} 391 392void Preprocessor::PTHSkipExcludedConditionalBlock() { 393 394 while (1) { 395 assert(CurPTHLexer); 396 assert(CurPTHLexer->LexingRawMode == false); 397 398 // Skip to the next '#else', '#elif', or #endif. 399 if (CurPTHLexer->SkipBlock()) { 400 // We have reached an #endif. Both the '#' and 'endif' tokens 401 // have been consumed by the PTHLexer. Just pop off the condition level. 402 PPConditionalInfo CondInfo; 403 bool InCond = CurPTHLexer->popConditionalLevel(CondInfo); 404 (void)InCond; // Silence warning in no-asserts mode. 405 assert(!InCond && "Can't be skipping if not in a conditional!"); 406 break; 407 } 408 409 // We have reached a '#else' or '#elif'. Lex the next token to get 410 // the directive flavor. 411 Token Tok; 412 LexUnexpandedToken(Tok); 413 414 // We can actually look up the IdentifierInfo here since we aren't in 415 // raw mode. 416 tok::PPKeywordKind K = Tok.getIdentifierInfo()->getPPKeywordID(); 417 418 if (K == tok::pp_else) { 419 // #else: Enter the else condition. We aren't in a nested condition 420 // since we skip those. We're always in the one matching the last 421 // blocked we skipped. 422 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel(); 423 // Note that we've seen a #else in this conditional. 424 CondInfo.FoundElse = true; 425 426 // If the #if block wasn't entered then enter the #else block now. 427 if (!CondInfo.FoundNonSkip) { 428 CondInfo.FoundNonSkip = true; 429 430 // Scan until the eod token. 431 CurPTHLexer->ParsingPreprocessorDirective = true; 432 DiscardUntilEndOfDirective(); 433 CurPTHLexer->ParsingPreprocessorDirective = false; 434 435 break; 436 } 437 438 // Otherwise skip this block. 439 continue; 440 } 441 442 assert(K == tok::pp_elif); 443 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel(); 444 445 // If this is a #elif with a #else before it, report the error. 446 if (CondInfo.FoundElse) 447 Diag(Tok, diag::pp_err_elif_after_else); 448 449 // If this is in a skipping block or if we're already handled this #if 450 // block, don't bother parsing the condition. We just skip this block. 451 if (CondInfo.FoundNonSkip) 452 continue; 453 454 // Evaluate the condition of the #elif. 455 IdentifierInfo *IfNDefMacro = 0; 456 CurPTHLexer->ParsingPreprocessorDirective = true; 457 bool ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro); 458 CurPTHLexer->ParsingPreprocessorDirective = false; 459 460 // If this condition is true, enter it! 461 if (ShouldEnter) { 462 CondInfo.FoundNonSkip = true; 463 break; 464 } 465 466 // Otherwise, skip this block and go to the next one. 467 continue; 468 } 469} 470 471/// LookupFile - Given a "foo" or <foo> reference, look up the indicated file, 472/// return null on failure. isAngled indicates whether the file reference is 473/// for system #include's or not (i.e. using <> instead of ""). 474const FileEntry *Preprocessor::LookupFile( 475 llvm::StringRef Filename, 476 bool isAngled, 477 const DirectoryLookup *FromDir, 478 const DirectoryLookup *&CurDir, 479 llvm::SmallVectorImpl<char> *SearchPath, 480 llvm::SmallVectorImpl<char> *RelativePath) { 481 // If the header lookup mechanism may be relative to the current file, pass in 482 // info about where the current file is. 483 const FileEntry *CurFileEnt = 0; 484 if (!FromDir) { 485 FileID FID = getCurrentFileLexer()->getFileID(); 486 CurFileEnt = SourceMgr.getFileEntryForID(FID); 487 488 // If there is no file entry associated with this file, it must be the 489 // predefines buffer. Any other file is not lexed with a normal lexer, so 490 // it won't be scanned for preprocessor directives. If we have the 491 // predefines buffer, resolve #include references (which come from the 492 // -include command line argument) as if they came from the main file, this 493 // affects file lookup etc. 494 if (CurFileEnt == 0) { 495 FID = SourceMgr.getMainFileID(); 496 CurFileEnt = SourceMgr.getFileEntryForID(FID); 497 } 498 } 499 500 // Do a standard file entry lookup. 501 CurDir = CurDirLookup; 502 const FileEntry *FE = HeaderInfo.LookupFile( 503 Filename, isAngled, FromDir, CurDir, CurFileEnt, 504 SearchPath, RelativePath); 505 if (FE) return FE; 506 507 // Otherwise, see if this is a subframework header. If so, this is relative 508 // to one of the headers on the #include stack. Walk the list of the current 509 // headers on the #include stack and pass them to HeaderInfo. 510 if (IsFileLexer()) { 511 if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID()))) 512 if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt, 513 SearchPath, RelativePath))) 514 return FE; 515 } 516 517 for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) { 518 IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1]; 519 if (IsFileLexer(ISEntry)) { 520 if ((CurFileEnt = 521 SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID()))) 522 if ((FE = HeaderInfo.LookupSubframeworkHeader( 523 Filename, CurFileEnt, SearchPath, RelativePath))) 524 return FE; 525 } 526 } 527 528 // Otherwise, we really couldn't find the file. 529 return 0; 530} 531 532 533//===----------------------------------------------------------------------===// 534// Preprocessor Directive Handling. 535//===----------------------------------------------------------------------===// 536 537/// HandleDirective - This callback is invoked when the lexer sees a # token 538/// at the start of a line. This consumes the directive, modifies the 539/// lexer/preprocessor state, and advances the lexer(s) so that the next token 540/// read is the correct one. 541void Preprocessor::HandleDirective(Token &Result) { 542 // FIXME: Traditional: # with whitespace before it not recognized by K&R? 543 544 // We just parsed a # character at the start of a line, so we're in directive 545 // mode. Tell the lexer this so any newlines we see will be converted into an 546 // EOD token (which terminates the directive). 547 CurPPLexer->ParsingPreprocessorDirective = true; 548 549 ++NumDirectives; 550 551 // We are about to read a token. For the multiple-include optimization FA to 552 // work, we have to remember if we had read any tokens *before* this 553 // pp-directive. 554 bool ReadAnyTokensBeforeDirective =CurPPLexer->MIOpt.getHasReadAnyTokensVal(); 555 556 // Save the '#' token in case we need to return it later. 557 Token SavedHash = Result; 558 559 // Read the next token, the directive flavor. This isn't expanded due to 560 // C99 6.10.3p8. 561 LexUnexpandedToken(Result); 562 563 // C99 6.10.3p11: Is this preprocessor directive in macro invocation? e.g.: 564 // #define A(x) #x 565 // A(abc 566 // #warning blah 567 // def) 568 // If so, the user is relying on non-portable behavior, emit a diagnostic. 569 if (InMacroArgs) 570 Diag(Result, diag::ext_embedded_directive); 571 572TryAgain: 573 switch (Result.getKind()) { 574 case tok::eod: 575 return; // null directive. 576 case tok::comment: 577 // Handle stuff like "# /*foo*/ define X" in -E -C mode. 578 LexUnexpandedToken(Result); 579 goto TryAgain; 580 case tok::code_completion: 581 if (CodeComplete) 582 CodeComplete->CodeCompleteDirective( 583 CurPPLexer->getConditionalStackDepth() > 0); 584 return; 585 case tok::numeric_constant: // # 7 GNU line marker directive. 586 if (getLangOptions().AsmPreprocessor) 587 break; // # 4 is not a preprocessor directive in .S files. 588 return HandleDigitDirective(Result); 589 default: 590 IdentifierInfo *II = Result.getIdentifierInfo(); 591 if (II == 0) break; // Not an identifier. 592 593 // Ask what the preprocessor keyword ID is. 594 switch (II->getPPKeywordID()) { 595 default: break; 596 // C99 6.10.1 - Conditional Inclusion. 597 case tok::pp_if: 598 return HandleIfDirective(Result, ReadAnyTokensBeforeDirective); 599 case tok::pp_ifdef: 600 return HandleIfdefDirective(Result, false, true/*not valid for miopt*/); 601 case tok::pp_ifndef: 602 return HandleIfdefDirective(Result, true, ReadAnyTokensBeforeDirective); 603 case tok::pp_elif: 604 return HandleElifDirective(Result); 605 case tok::pp_else: 606 return HandleElseDirective(Result); 607 case tok::pp_endif: 608 return HandleEndifDirective(Result); 609 610 // C99 6.10.2 - Source File Inclusion. 611 case tok::pp_include: 612 // Handle #include. 613 return HandleIncludeDirective(SavedHash.getLocation(), Result); 614 case tok::pp___include_macros: 615 // Handle -imacros. 616 return HandleIncludeMacrosDirective(SavedHash.getLocation(), Result); 617 618 // C99 6.10.3 - Macro Replacement. 619 case tok::pp_define: 620 return HandleDefineDirective(Result); 621 case tok::pp_undef: 622 return HandleUndefDirective(Result); 623 624 // C99 6.10.4 - Line Control. 625 case tok::pp_line: 626 return HandleLineDirective(Result); 627 628 // C99 6.10.5 - Error Directive. 629 case tok::pp_error: 630 return HandleUserDiagnosticDirective(Result, false); 631 632 // C99 6.10.6 - Pragma Directive. 633 case tok::pp_pragma: 634 return HandlePragmaDirective(PIK_HashPragma); 635 636 // GNU Extensions. 637 case tok::pp_import: 638 return HandleImportDirective(SavedHash.getLocation(), Result); 639 case tok::pp_include_next: 640 return HandleIncludeNextDirective(SavedHash.getLocation(), Result); 641 642 case tok::pp_warning: 643 Diag(Result, diag::ext_pp_warning_directive); 644 return HandleUserDiagnosticDirective(Result, true); 645 case tok::pp_ident: 646 return HandleIdentSCCSDirective(Result); 647 case tok::pp_sccs: 648 return HandleIdentSCCSDirective(Result); 649 case tok::pp_assert: 650 //isExtension = true; // FIXME: implement #assert 651 break; 652 case tok::pp_unassert: 653 //isExtension = true; // FIXME: implement #unassert 654 break; 655 } 656 break; 657 } 658 659 // If this is a .S file, treat unknown # directives as non-preprocessor 660 // directives. This is important because # may be a comment or introduce 661 // various pseudo-ops. Just return the # token and push back the following 662 // token to be lexed next time. 663 if (getLangOptions().AsmPreprocessor) { 664 Token *Toks = new Token[2]; 665 // Return the # and the token after it. 666 Toks[0] = SavedHash; 667 Toks[1] = Result; 668 669 // If the second token is a hashhash token, then we need to translate it to 670 // unknown so the token lexer doesn't try to perform token pasting. 671 if (Result.is(tok::hashhash)) 672 Toks[1].setKind(tok::unknown); 673 674 // Enter this token stream so that we re-lex the tokens. Make sure to 675 // enable macro expansion, in case the token after the # is an identifier 676 // that is expanded. 677 EnterTokenStream(Toks, 2, false, true); 678 return; 679 } 680 681 // If we reached here, the preprocessing token is not valid! 682 Diag(Result, diag::err_pp_invalid_directive); 683 684 // Read the rest of the PP line. 685 DiscardUntilEndOfDirective(); 686 687 // Okay, we're done parsing the directive. 688} 689 690/// GetLineValue - Convert a numeric token into an unsigned value, emitting 691/// Diagnostic DiagID if it is invalid, and returning the value in Val. 692static bool GetLineValue(Token &DigitTok, unsigned &Val, 693 unsigned DiagID, Preprocessor &PP) { 694 if (DigitTok.isNot(tok::numeric_constant)) { 695 PP.Diag(DigitTok, DiagID); 696 697 if (DigitTok.isNot(tok::eod)) 698 PP.DiscardUntilEndOfDirective(); 699 return true; 700 } 701 702 llvm::SmallString<64> IntegerBuffer; 703 IntegerBuffer.resize(DigitTok.getLength()); 704 const char *DigitTokBegin = &IntegerBuffer[0]; 705 bool Invalid = false; 706 unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin, &Invalid); 707 if (Invalid) 708 return true; 709 710 // Verify that we have a simple digit-sequence, and compute the value. This 711 // is always a simple digit string computed in decimal, so we do this manually 712 // here. 713 Val = 0; 714 for (unsigned i = 0; i != ActualLength; ++i) { 715 if (!isdigit(DigitTokBegin[i])) { 716 PP.Diag(PP.AdvanceToTokenCharacter(DigitTok.getLocation(), i), 717 diag::err_pp_line_digit_sequence); 718 PP.DiscardUntilEndOfDirective(); 719 return true; 720 } 721 722 unsigned NextVal = Val*10+(DigitTokBegin[i]-'0'); 723 if (NextVal < Val) { // overflow. 724 PP.Diag(DigitTok, DiagID); 725 PP.DiscardUntilEndOfDirective(); 726 return true; 727 } 728 Val = NextVal; 729 } 730 731 // Reject 0, this is needed both by #line numbers and flags. 732 if (Val == 0) { 733 PP.Diag(DigitTok, DiagID); 734 PP.DiscardUntilEndOfDirective(); 735 return true; 736 } 737 738 if (DigitTokBegin[0] == '0') 739 PP.Diag(DigitTok.getLocation(), diag::warn_pp_line_decimal); 740 741 return false; 742} 743 744/// HandleLineDirective - Handle #line directive: C99 6.10.4. The two 745/// acceptable forms are: 746/// # line digit-sequence 747/// # line digit-sequence "s-char-sequence" 748void Preprocessor::HandleLineDirective(Token &Tok) { 749 // Read the line # and string argument. Per C99 6.10.4p5, these tokens are 750 // expanded. 751 Token DigitTok; 752 Lex(DigitTok); 753 754 // Validate the number and convert it to an unsigned. 755 unsigned LineNo; 756 if (GetLineValue(DigitTok, LineNo, diag::err_pp_line_requires_integer,*this)) 757 return; 758 759 // Enforce C99 6.10.4p3: "The digit sequence shall not specify ... a 760 // number greater than 2147483647". C90 requires that the line # be <= 32767. 761 unsigned LineLimit = Features.C99 ? 2147483648U : 32768U; 762 if (LineNo >= LineLimit) 763 Diag(DigitTok, diag::ext_pp_line_too_big) << LineLimit; 764 765 int FilenameID = -1; 766 Token StrTok; 767 Lex(StrTok); 768 769 // If the StrTok is "eod", then it wasn't present. Otherwise, it must be a 770 // string followed by eod. 771 if (StrTok.is(tok::eod)) 772 ; // ok 773 else if (StrTok.isNot(tok::string_literal)) { 774 Diag(StrTok, diag::err_pp_line_invalid_filename); 775 DiscardUntilEndOfDirective(); 776 return; 777 } else { 778 // Parse and validate the string, converting it into a unique ID. 779 StringLiteralParser Literal(&StrTok, 1, *this); 780 assert(!Literal.AnyWide && "Didn't allow wide strings in"); 781 if (Literal.hadError) 782 return DiscardUntilEndOfDirective(); 783 if (Literal.Pascal) { 784 Diag(StrTok, diag::err_pp_linemarker_invalid_filename); 785 return DiscardUntilEndOfDirective(); 786 } 787 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(), 788 Literal.GetStringLength()); 789 790 // Verify that there is nothing after the string, other than EOD. Because 791 // of C99 6.10.4p5, macros that expand to empty tokens are ok. 792 CheckEndOfDirective("line", true); 793 } 794 795 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID); 796 797 if (Callbacks) 798 Callbacks->FileChanged(CurPPLexer->getSourceLocation(), 799 PPCallbacks::RenameFile, 800 SrcMgr::C_User); 801} 802 803/// ReadLineMarkerFlags - Parse and validate any flags at the end of a GNU line 804/// marker directive. 805static bool ReadLineMarkerFlags(bool &IsFileEntry, bool &IsFileExit, 806 bool &IsSystemHeader, bool &IsExternCHeader, 807 Preprocessor &PP) { 808 unsigned FlagVal; 809 Token FlagTok; 810 PP.Lex(FlagTok); 811 if (FlagTok.is(tok::eod)) return false; 812 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP)) 813 return true; 814 815 if (FlagVal == 1) { 816 IsFileEntry = true; 817 818 PP.Lex(FlagTok); 819 if (FlagTok.is(tok::eod)) return false; 820 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP)) 821 return true; 822 } else if (FlagVal == 2) { 823 IsFileExit = true; 824 825 SourceManager &SM = PP.getSourceManager(); 826 // If we are leaving the current presumed file, check to make sure the 827 // presumed include stack isn't empty! 828 FileID CurFileID = 829 SM.getDecomposedInstantiationLoc(FlagTok.getLocation()).first; 830 PresumedLoc PLoc = SM.getPresumedLoc(FlagTok.getLocation()); 831 if (PLoc.isInvalid()) 832 return true; 833 834 // If there is no include loc (main file) or if the include loc is in a 835 // different physical file, then we aren't in a "1" line marker flag region. 836 SourceLocation IncLoc = PLoc.getIncludeLoc(); 837 if (IncLoc.isInvalid() || 838 SM.getDecomposedInstantiationLoc(IncLoc).first != CurFileID) { 839 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_pop); 840 PP.DiscardUntilEndOfDirective(); 841 return true; 842 } 843 844 PP.Lex(FlagTok); 845 if (FlagTok.is(tok::eod)) return false; 846 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP)) 847 return true; 848 } 849 850 // We must have 3 if there are still flags. 851 if (FlagVal != 3) { 852 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); 853 PP.DiscardUntilEndOfDirective(); 854 return true; 855 } 856 857 IsSystemHeader = true; 858 859 PP.Lex(FlagTok); 860 if (FlagTok.is(tok::eod)) return false; 861 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP)) 862 return true; 863 864 // We must have 4 if there is yet another flag. 865 if (FlagVal != 4) { 866 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); 867 PP.DiscardUntilEndOfDirective(); 868 return true; 869 } 870 871 IsExternCHeader = true; 872 873 PP.Lex(FlagTok); 874 if (FlagTok.is(tok::eod)) return false; 875 876 // There are no more valid flags here. 877 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); 878 PP.DiscardUntilEndOfDirective(); 879 return true; 880} 881 882/// HandleDigitDirective - Handle a GNU line marker directive, whose syntax is 883/// one of the following forms: 884/// 885/// # 42 886/// # 42 "file" ('1' | '2')? 887/// # 42 "file" ('1' | '2')? '3' '4'? 888/// 889void Preprocessor::HandleDigitDirective(Token &DigitTok) { 890 // Validate the number and convert it to an unsigned. GNU does not have a 891 // line # limit other than it fit in 32-bits. 892 unsigned LineNo; 893 if (GetLineValue(DigitTok, LineNo, diag::err_pp_linemarker_requires_integer, 894 *this)) 895 return; 896 897 Token StrTok; 898 Lex(StrTok); 899 900 bool IsFileEntry = false, IsFileExit = false; 901 bool IsSystemHeader = false, IsExternCHeader = false; 902 int FilenameID = -1; 903 904 // If the StrTok is "eod", then it wasn't present. Otherwise, it must be a 905 // string followed by eod. 906 if (StrTok.is(tok::eod)) 907 ; // ok 908 else if (StrTok.isNot(tok::string_literal)) { 909 Diag(StrTok, diag::err_pp_linemarker_invalid_filename); 910 return DiscardUntilEndOfDirective(); 911 } else { 912 // Parse and validate the string, converting it into a unique ID. 913 StringLiteralParser Literal(&StrTok, 1, *this); 914 assert(!Literal.AnyWide && "Didn't allow wide strings in"); 915 if (Literal.hadError) 916 return DiscardUntilEndOfDirective(); 917 if (Literal.Pascal) { 918 Diag(StrTok, diag::err_pp_linemarker_invalid_filename); 919 return DiscardUntilEndOfDirective(); 920 } 921 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(), 922 Literal.GetStringLength()); 923 924 // If a filename was present, read any flags that are present. 925 if (ReadLineMarkerFlags(IsFileEntry, IsFileExit, 926 IsSystemHeader, IsExternCHeader, *this)) 927 return; 928 } 929 930 // Create a line note with this information. 931 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID, 932 IsFileEntry, IsFileExit, 933 IsSystemHeader, IsExternCHeader); 934 935 // If the preprocessor has callbacks installed, notify them of the #line 936 // change. This is used so that the line marker comes out in -E mode for 937 // example. 938 if (Callbacks) { 939 PPCallbacks::FileChangeReason Reason = PPCallbacks::RenameFile; 940 if (IsFileEntry) 941 Reason = PPCallbacks::EnterFile; 942 else if (IsFileExit) 943 Reason = PPCallbacks::ExitFile; 944 SrcMgr::CharacteristicKind FileKind = SrcMgr::C_User; 945 if (IsExternCHeader) 946 FileKind = SrcMgr::C_ExternCSystem; 947 else if (IsSystemHeader) 948 FileKind = SrcMgr::C_System; 949 950 Callbacks->FileChanged(CurPPLexer->getSourceLocation(), Reason, FileKind); 951 } 952} 953 954 955/// HandleUserDiagnosticDirective - Handle a #warning or #error directive. 956/// 957void Preprocessor::HandleUserDiagnosticDirective(Token &Tok, 958 bool isWarning) { 959 // PTH doesn't emit #warning or #error directives. 960 if (CurPTHLexer) 961 return CurPTHLexer->DiscardToEndOfLine(); 962 963 // Read the rest of the line raw. We do this because we don't want macros 964 // to be expanded and we don't require that the tokens be valid preprocessing 965 // tokens. For example, this is allowed: "#warning ` 'foo". GCC does 966 // collapse multiple consequtive white space between tokens, but this isn't 967 // specified by the standard. 968 std::string Message = CurLexer->ReadToEndOfLine(); 969 if (isWarning) 970 Diag(Tok, diag::pp_hash_warning) << Message; 971 else 972 Diag(Tok, diag::err_pp_hash_error) << Message; 973} 974 975/// HandleIdentSCCSDirective - Handle a #ident/#sccs directive. 976/// 977void Preprocessor::HandleIdentSCCSDirective(Token &Tok) { 978 // Yes, this directive is an extension. 979 Diag(Tok, diag::ext_pp_ident_directive); 980 981 // Read the string argument. 982 Token StrTok; 983 Lex(StrTok); 984 985 // If the token kind isn't a string, it's a malformed directive. 986 if (StrTok.isNot(tok::string_literal) && 987 StrTok.isNot(tok::wide_string_literal)) { 988 Diag(StrTok, diag::err_pp_malformed_ident); 989 if (StrTok.isNot(tok::eod)) 990 DiscardUntilEndOfDirective(); 991 return; 992 } 993 994 // Verify that there is nothing after the string, other than EOD. 995 CheckEndOfDirective("ident"); 996 997 if (Callbacks) { 998 bool Invalid = false; 999 std::string Str = getSpelling(StrTok, &Invalid); 1000 if (!Invalid) 1001 Callbacks->Ident(Tok.getLocation(), Str); 1002 } 1003} 1004 1005//===----------------------------------------------------------------------===// 1006// Preprocessor Include Directive Handling. 1007//===----------------------------------------------------------------------===// 1008 1009/// GetIncludeFilenameSpelling - Turn the specified lexer token into a fully 1010/// checked and spelled filename, e.g. as an operand of #include. This returns 1011/// true if the input filename was in <>'s or false if it were in ""'s. The 1012/// caller is expected to provide a buffer that is large enough to hold the 1013/// spelling of the filename, but is also expected to handle the case when 1014/// this method decides to use a different buffer. 1015bool Preprocessor::GetIncludeFilenameSpelling(SourceLocation Loc, 1016 llvm::StringRef &Buffer) { 1017 // Get the text form of the filename. 1018 assert(!Buffer.empty() && "Can't have tokens with empty spellings!"); 1019 1020 // Make sure the filename is <x> or "x". 1021 bool isAngled; 1022 if (Buffer[0] == '<') { 1023 if (Buffer.back() != '>') { 1024 Diag(Loc, diag::err_pp_expects_filename); 1025 Buffer = llvm::StringRef(); 1026 return true; 1027 } 1028 isAngled = true; 1029 } else if (Buffer[0] == '"') { 1030 if (Buffer.back() != '"') { 1031 Diag(Loc, diag::err_pp_expects_filename); 1032 Buffer = llvm::StringRef(); 1033 return true; 1034 } 1035 isAngled = false; 1036 } else { 1037 Diag(Loc, diag::err_pp_expects_filename); 1038 Buffer = llvm::StringRef(); 1039 return true; 1040 } 1041 1042 // Diagnose #include "" as invalid. 1043 if (Buffer.size() <= 2) { 1044 Diag(Loc, diag::err_pp_empty_filename); 1045 Buffer = llvm::StringRef(); 1046 return true; 1047 } 1048 1049 // Skip the brackets. 1050 Buffer = Buffer.substr(1, Buffer.size()-2); 1051 return isAngled; 1052} 1053 1054/// ConcatenateIncludeName - Handle cases where the #include name is expanded 1055/// from a macro as multiple tokens, which need to be glued together. This 1056/// occurs for code like: 1057/// #define FOO <a/b.h> 1058/// #include FOO 1059/// because in this case, "<a/b.h>" is returned as 7 tokens, not one. 1060/// 1061/// This code concatenates and consumes tokens up to the '>' token. It returns 1062/// false if the > was found, otherwise it returns true if it finds and consumes 1063/// the EOD marker. 1064bool Preprocessor::ConcatenateIncludeName( 1065 llvm::SmallString<128> &FilenameBuffer, 1066 SourceLocation &End) { 1067 Token CurTok; 1068 1069 Lex(CurTok); 1070 while (CurTok.isNot(tok::eod)) { 1071 End = CurTok.getLocation(); 1072 1073 // FIXME: Provide code completion for #includes. 1074 if (CurTok.is(tok::code_completion)) { 1075 Lex(CurTok); 1076 continue; 1077 } 1078 1079 // Append the spelling of this token to the buffer. If there was a space 1080 // before it, add it now. 1081 if (CurTok.hasLeadingSpace()) 1082 FilenameBuffer.push_back(' '); 1083 1084 // Get the spelling of the token, directly into FilenameBuffer if possible. 1085 unsigned PreAppendSize = FilenameBuffer.size(); 1086 FilenameBuffer.resize(PreAppendSize+CurTok.getLength()); 1087 1088 const char *BufPtr = &FilenameBuffer[PreAppendSize]; 1089 unsigned ActualLen = getSpelling(CurTok, BufPtr); 1090 1091 // If the token was spelled somewhere else, copy it into FilenameBuffer. 1092 if (BufPtr != &FilenameBuffer[PreAppendSize]) 1093 memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen); 1094 1095 // Resize FilenameBuffer to the correct size. 1096 if (CurTok.getLength() != ActualLen) 1097 FilenameBuffer.resize(PreAppendSize+ActualLen); 1098 1099 // If we found the '>' marker, return success. 1100 if (CurTok.is(tok::greater)) 1101 return false; 1102 1103 Lex(CurTok); 1104 } 1105 1106 // If we hit the eod marker, emit an error and return true so that the caller 1107 // knows the EOD has been read. 1108 Diag(CurTok.getLocation(), diag::err_pp_expects_filename); 1109 return true; 1110} 1111 1112/// HandleIncludeDirective - The "#include" tokens have just been read, read the 1113/// file to be included from the lexer, then include it! This is a common 1114/// routine with functionality shared between #include, #include_next and 1115/// #import. LookupFrom is set when this is a #include_next directive, it 1116/// specifies the file to start searching from. 1117void Preprocessor::HandleIncludeDirective(SourceLocation HashLoc, 1118 Token &IncludeTok, 1119 const DirectoryLookup *LookupFrom, 1120 bool isImport) { 1121 1122 Token FilenameTok; 1123 CurPPLexer->LexIncludeFilename(FilenameTok); 1124 1125 // Reserve a buffer to get the spelling. 1126 llvm::SmallString<128> FilenameBuffer; 1127 llvm::StringRef Filename; 1128 SourceLocation End; 1129 1130 switch (FilenameTok.getKind()) { 1131 case tok::eod: 1132 // If the token kind is EOD, the error has already been diagnosed. 1133 return; 1134 1135 case tok::angle_string_literal: 1136 case tok::string_literal: 1137 Filename = getSpelling(FilenameTok, FilenameBuffer); 1138 End = FilenameTok.getLocation(); 1139 break; 1140 1141 case tok::less: 1142 // This could be a <foo/bar.h> file coming from a macro expansion. In this 1143 // case, glue the tokens together into FilenameBuffer and interpret those. 1144 FilenameBuffer.push_back('<'); 1145 if (ConcatenateIncludeName(FilenameBuffer, End)) 1146 return; // Found <eod> but no ">"? Diagnostic already emitted. 1147 Filename = FilenameBuffer.str(); 1148 break; 1149 default: 1150 Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename); 1151 DiscardUntilEndOfDirective(); 1152 return; 1153 } 1154 1155 bool isAngled = 1156 GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename); 1157 // If GetIncludeFilenameSpelling set the start ptr to null, there was an 1158 // error. 1159 if (Filename.empty()) { 1160 DiscardUntilEndOfDirective(); 1161 return; 1162 } 1163 1164 // Verify that there is nothing after the filename, other than EOD. Note that 1165 // we allow macros that expand to nothing after the filename, because this 1166 // falls into the category of "#include pp-tokens new-line" specified in 1167 // C99 6.10.2p4. 1168 CheckEndOfDirective(IncludeTok.getIdentifierInfo()->getNameStart(), true); 1169 1170 // Check that we don't have infinite #include recursion. 1171 if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1) { 1172 Diag(FilenameTok, diag::err_pp_include_too_deep); 1173 return; 1174 } 1175 1176 // Search include directories. 1177 const DirectoryLookup *CurDir; 1178 llvm::SmallString<1024> SearchPath; 1179 llvm::SmallString<1024> RelativePath; 1180 // We get the raw path only if we have 'Callbacks' to which we later pass 1181 // the path. 1182 const FileEntry *File = LookupFile( 1183 Filename, isAngled, LookupFrom, CurDir, 1184 Callbacks ? &SearchPath : NULL, Callbacks ? &RelativePath : NULL); 1185 if (File == 0) { 1186 Diag(FilenameTok, diag::err_pp_file_not_found) << Filename; 1187 return; 1188 } 1189 1190 // Notify the callback object that we've seen an inclusion directive. 1191 if (Callbacks) 1192 Callbacks->InclusionDirective(HashLoc, IncludeTok, Filename, isAngled, File, 1193 End, SearchPath, RelativePath); 1194 1195 // The #included file will be considered to be a system header if either it is 1196 // in a system include directory, or if the #includer is a system include 1197 // header. 1198 SrcMgr::CharacteristicKind FileCharacter = 1199 std::max(HeaderInfo.getFileDirFlavor(File), 1200 SourceMgr.getFileCharacteristic(FilenameTok.getLocation())); 1201 1202 // Ask HeaderInfo if we should enter this #include file. If not, #including 1203 // this file will have no effect. 1204 if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) { 1205 if (Callbacks) 1206 Callbacks->FileSkipped(*File, FilenameTok, FileCharacter); 1207 return; 1208 } 1209 1210 // Look up the file, create a File ID for it. 1211 FileID FID = SourceMgr.createFileID(File, FilenameTok.getLocation(), 1212 FileCharacter); 1213 if (FID.isInvalid()) { 1214 Diag(FilenameTok, diag::err_pp_file_not_found) << Filename; 1215 return; 1216 } 1217 1218 // Finally, if all is good, enter the new file! 1219 EnterSourceFile(FID, CurDir, FilenameTok.getLocation()); 1220} 1221 1222/// HandleIncludeNextDirective - Implements #include_next. 1223/// 1224void Preprocessor::HandleIncludeNextDirective(SourceLocation HashLoc, 1225 Token &IncludeNextTok) { 1226 Diag(IncludeNextTok, diag::ext_pp_include_next_directive); 1227 1228 // #include_next is like #include, except that we start searching after 1229 // the current found directory. If we can't do this, issue a 1230 // diagnostic. 1231 const DirectoryLookup *Lookup = CurDirLookup; 1232 if (isInPrimaryFile()) { 1233 Lookup = 0; 1234 Diag(IncludeNextTok, diag::pp_include_next_in_primary); 1235 } else if (Lookup == 0) { 1236 Diag(IncludeNextTok, diag::pp_include_next_absolute_path); 1237 } else { 1238 // Start looking up in the next directory. 1239 ++Lookup; 1240 } 1241 1242 return HandleIncludeDirective(HashLoc, IncludeNextTok, Lookup); 1243} 1244 1245/// HandleImportDirective - Implements #import. 1246/// 1247void Preprocessor::HandleImportDirective(SourceLocation HashLoc, 1248 Token &ImportTok) { 1249 if (!Features.ObjC1) // #import is standard for ObjC. 1250 Diag(ImportTok, diag::ext_pp_import_directive); 1251 1252 return HandleIncludeDirective(HashLoc, ImportTok, 0, true); 1253} 1254 1255/// HandleIncludeMacrosDirective - The -imacros command line option turns into a 1256/// pseudo directive in the predefines buffer. This handles it by sucking all 1257/// tokens through the preprocessor and discarding them (only keeping the side 1258/// effects on the preprocessor). 1259void Preprocessor::HandleIncludeMacrosDirective(SourceLocation HashLoc, 1260 Token &IncludeMacrosTok) { 1261 // This directive should only occur in the predefines buffer. If not, emit an 1262 // error and reject it. 1263 SourceLocation Loc = IncludeMacrosTok.getLocation(); 1264 if (strcmp(SourceMgr.getBufferName(Loc), "<built-in>") != 0) { 1265 Diag(IncludeMacrosTok.getLocation(), 1266 diag::pp_include_macros_out_of_predefines); 1267 DiscardUntilEndOfDirective(); 1268 return; 1269 } 1270 1271 // Treat this as a normal #include for checking purposes. If this is 1272 // successful, it will push a new lexer onto the include stack. 1273 HandleIncludeDirective(HashLoc, IncludeMacrosTok, 0, false); 1274 1275 Token TmpTok; 1276 do { 1277 Lex(TmpTok); 1278 assert(TmpTok.isNot(tok::eof) && "Didn't find end of -imacros!"); 1279 } while (TmpTok.isNot(tok::hashhash)); 1280} 1281 1282//===----------------------------------------------------------------------===// 1283// Preprocessor Macro Directive Handling. 1284//===----------------------------------------------------------------------===// 1285 1286/// ReadMacroDefinitionArgList - The ( starting an argument list of a macro 1287/// definition has just been read. Lex the rest of the arguments and the 1288/// closing ), updating MI with what we learn. Return true if an error occurs 1289/// parsing the arg list. 1290bool Preprocessor::ReadMacroDefinitionArgList(MacroInfo *MI) { 1291 llvm::SmallVector<IdentifierInfo*, 32> Arguments; 1292 1293 Token Tok; 1294 while (1) { 1295 LexUnexpandedToken(Tok); 1296 switch (Tok.getKind()) { 1297 case tok::r_paren: 1298 // Found the end of the argument list. 1299 if (Arguments.empty()) // #define FOO() 1300 return false; 1301 // Otherwise we have #define FOO(A,) 1302 Diag(Tok, diag::err_pp_expected_ident_in_arg_list); 1303 return true; 1304 case tok::ellipsis: // #define X(... -> C99 varargs 1305 // Warn if use of C99 feature in non-C99 mode. 1306 if (!Features.C99) Diag(Tok, diag::ext_variadic_macro); 1307 1308 // Lex the token after the identifier. 1309 LexUnexpandedToken(Tok); 1310 if (Tok.isNot(tok::r_paren)) { 1311 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); 1312 return true; 1313 } 1314 // Add the __VA_ARGS__ identifier as an argument. 1315 Arguments.push_back(Ident__VA_ARGS__); 1316 MI->setIsC99Varargs(); 1317 MI->setArgumentList(&Arguments[0], Arguments.size(), BP); 1318 return false; 1319 case tok::eod: // #define X( 1320 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); 1321 return true; 1322 default: 1323 // Handle keywords and identifiers here to accept things like 1324 // #define Foo(for) for. 1325 IdentifierInfo *II = Tok.getIdentifierInfo(); 1326 if (II == 0) { 1327 // #define X(1 1328 Diag(Tok, diag::err_pp_invalid_tok_in_arg_list); 1329 return true; 1330 } 1331 1332 // If this is already used as an argument, it is used multiple times (e.g. 1333 // #define X(A,A. 1334 if (std::find(Arguments.begin(), Arguments.end(), II) != 1335 Arguments.end()) { // C99 6.10.3p6 1336 Diag(Tok, diag::err_pp_duplicate_name_in_arg_list) << II; 1337 return true; 1338 } 1339 1340 // Add the argument to the macro info. 1341 Arguments.push_back(II); 1342 1343 // Lex the token after the identifier. 1344 LexUnexpandedToken(Tok); 1345 1346 switch (Tok.getKind()) { 1347 default: // #define X(A B 1348 Diag(Tok, diag::err_pp_expected_comma_in_arg_list); 1349 return true; 1350 case tok::r_paren: // #define X(A) 1351 MI->setArgumentList(&Arguments[0], Arguments.size(), BP); 1352 return false; 1353 case tok::comma: // #define X(A, 1354 break; 1355 case tok::ellipsis: // #define X(A... -> GCC extension 1356 // Diagnose extension. 1357 Diag(Tok, diag::ext_named_variadic_macro); 1358 1359 // Lex the token after the identifier. 1360 LexUnexpandedToken(Tok); 1361 if (Tok.isNot(tok::r_paren)) { 1362 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); 1363 return true; 1364 } 1365 1366 MI->setIsGNUVarargs(); 1367 MI->setArgumentList(&Arguments[0], Arguments.size(), BP); 1368 return false; 1369 } 1370 } 1371 } 1372} 1373 1374/// HandleDefineDirective - Implements #define. This consumes the entire macro 1375/// line then lets the caller lex the next real token. 1376void Preprocessor::HandleDefineDirective(Token &DefineTok) { 1377 ++NumDefined; 1378 1379 Token MacroNameTok; 1380 ReadMacroName(MacroNameTok, 1); 1381 1382 // Error reading macro name? If so, diagnostic already issued. 1383 if (MacroNameTok.is(tok::eod)) 1384 return; 1385 1386 Token LastTok = MacroNameTok; 1387 1388 // If we are supposed to keep comments in #defines, reenable comment saving 1389 // mode. 1390 if (CurLexer) CurLexer->SetCommentRetentionState(KeepMacroComments); 1391 1392 // Create the new macro. 1393 MacroInfo *MI = AllocateMacroInfo(MacroNameTok.getLocation()); 1394 1395 Token Tok; 1396 LexUnexpandedToken(Tok); 1397 1398 // If this is a function-like macro definition, parse the argument list, 1399 // marking each of the identifiers as being used as macro arguments. Also, 1400 // check other constraints on the first token of the macro body. 1401 if (Tok.is(tok::eod)) { 1402 // If there is no body to this macro, we have no special handling here. 1403 } else if (Tok.hasLeadingSpace()) { 1404 // This is a normal token with leading space. Clear the leading space 1405 // marker on the first token to get proper expansion. 1406 Tok.clearFlag(Token::LeadingSpace); 1407 } else if (Tok.is(tok::l_paren)) { 1408 // This is a function-like macro definition. Read the argument list. 1409 MI->setIsFunctionLike(); 1410 if (ReadMacroDefinitionArgList(MI)) { 1411 // Forget about MI. 1412 ReleaseMacroInfo(MI); 1413 // Throw away the rest of the line. 1414 if (CurPPLexer->ParsingPreprocessorDirective) 1415 DiscardUntilEndOfDirective(); 1416 return; 1417 } 1418 1419 // If this is a definition of a variadic C99 function-like macro, not using 1420 // the GNU named varargs extension, enabled __VA_ARGS__. 1421 1422 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. 1423 // This gets unpoisoned where it is allowed. 1424 assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!"); 1425 if (MI->isC99Varargs()) 1426 Ident__VA_ARGS__->setIsPoisoned(false); 1427 1428 // Read the first token after the arg list for down below. 1429 LexUnexpandedToken(Tok); 1430 } else if (Features.C99) { 1431 // C99 requires whitespace between the macro definition and the body. Emit 1432 // a diagnostic for something like "#define X+". 1433 Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name); 1434 } else { 1435 // C90 6.8 TC1 says: "In the definition of an object-like macro, if the 1436 // first character of a replacement list is not a character required by 1437 // subclause 5.2.1, then there shall be white-space separation between the 1438 // identifier and the replacement list.". 5.2.1 lists this set: 1439 // "A-Za-z0-9!"#%&'()*+,_./:;<=>?[\]^_{|}~" as well as whitespace, which 1440 // is irrelevant here. 1441 bool isInvalid = false; 1442 if (Tok.is(tok::at)) // @ is not in the list above. 1443 isInvalid = true; 1444 else if (Tok.is(tok::unknown)) { 1445 // If we have an unknown token, it is something strange like "`". Since 1446 // all of valid characters would have lexed into a single character 1447 // token of some sort, we know this is not a valid case. 1448 isInvalid = true; 1449 } 1450 if (isInvalid) 1451 Diag(Tok, diag::ext_missing_whitespace_after_macro_name); 1452 else 1453 Diag(Tok, diag::warn_missing_whitespace_after_macro_name); 1454 } 1455 1456 if (!Tok.is(tok::eod)) 1457 LastTok = Tok; 1458 1459 // Read the rest of the macro body. 1460 if (MI->isObjectLike()) { 1461 // Object-like macros are very simple, just read their body. 1462 while (Tok.isNot(tok::eod)) { 1463 LastTok = Tok; 1464 MI->AddTokenToBody(Tok); 1465 // Get the next token of the macro. 1466 LexUnexpandedToken(Tok); 1467 } 1468 1469 } else { 1470 // Otherwise, read the body of a function-like macro. While we are at it, 1471 // check C99 6.10.3.2p1: ensure that # operators are followed by macro 1472 // parameters in function-like macro expansions. 1473 while (Tok.isNot(tok::eod)) { 1474 LastTok = Tok; 1475 1476 if (Tok.isNot(tok::hash)) { 1477 MI->AddTokenToBody(Tok); 1478 1479 // Get the next token of the macro. 1480 LexUnexpandedToken(Tok); 1481 continue; 1482 } 1483 1484 // Get the next token of the macro. 1485 LexUnexpandedToken(Tok); 1486 1487 // Check for a valid macro arg identifier. 1488 if (Tok.getIdentifierInfo() == 0 || 1489 MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) { 1490 1491 // If this is assembler-with-cpp mode, we accept random gibberish after 1492 // the '#' because '#' is often a comment character. However, change 1493 // the kind of the token to tok::unknown so that the preprocessor isn't 1494 // confused. 1495 if (getLangOptions().AsmPreprocessor && Tok.isNot(tok::eod)) { 1496 LastTok.setKind(tok::unknown); 1497 } else { 1498 Diag(Tok, diag::err_pp_stringize_not_parameter); 1499 ReleaseMacroInfo(MI); 1500 1501 // Disable __VA_ARGS__ again. 1502 Ident__VA_ARGS__->setIsPoisoned(true); 1503 return; 1504 } 1505 } 1506 1507 // Things look ok, add the '#' and param name tokens to the macro. 1508 MI->AddTokenToBody(LastTok); 1509 MI->AddTokenToBody(Tok); 1510 LastTok = Tok; 1511 1512 // Get the next token of the macro. 1513 LexUnexpandedToken(Tok); 1514 } 1515 } 1516 1517 1518 // Disable __VA_ARGS__ again. 1519 Ident__VA_ARGS__->setIsPoisoned(true); 1520 1521 // Check that there is no paste (##) operator at the beginning or end of the 1522 // replacement list. 1523 unsigned NumTokens = MI->getNumTokens(); 1524 if (NumTokens != 0) { 1525 if (MI->getReplacementToken(0).is(tok::hashhash)) { 1526 Diag(MI->getReplacementToken(0), diag::err_paste_at_start); 1527 ReleaseMacroInfo(MI); 1528 return; 1529 } 1530 if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) { 1531 Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end); 1532 ReleaseMacroInfo(MI); 1533 return; 1534 } 1535 } 1536 1537 MI->setDefinitionEndLoc(LastTok.getLocation()); 1538 1539 // Finally, if this identifier already had a macro defined for it, verify that 1540 // the macro bodies are identical and free the old definition. 1541 if (MacroInfo *OtherMI = getMacroInfo(MacroNameTok.getIdentifierInfo())) { 1542 // It is very common for system headers to have tons of macro redefinitions 1543 // and for warnings to be disabled in system headers. If this is the case, 1544 // then don't bother calling MacroInfo::isIdenticalTo. 1545 if (!getDiagnostics().getSuppressSystemWarnings() || 1546 !SourceMgr.isInSystemHeader(DefineTok.getLocation())) { 1547 if (!OtherMI->isUsed() && OtherMI->isWarnIfUnused()) 1548 Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used); 1549 1550 // Macros must be identical. This means all tokens and whitespace 1551 // separation must be the same. C99 6.10.3.2. 1552 if (!OtherMI->isAllowRedefinitionsWithoutWarning() && 1553 !MI->isIdenticalTo(*OtherMI, *this)) { 1554 Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef) 1555 << MacroNameTok.getIdentifierInfo(); 1556 Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition); 1557 } 1558 } 1559 if (OtherMI->isWarnIfUnused()) 1560 WarnUnusedMacroLocs.erase(OtherMI->getDefinitionLoc()); 1561 ReleaseMacroInfo(OtherMI); 1562 } 1563 1564 setMacroInfo(MacroNameTok.getIdentifierInfo(), MI); 1565 1566 assert(!MI->isUsed()); 1567 // If we need warning for not using the macro, add its location in the 1568 // warn-because-unused-macro set. If it gets used it will be removed from set. 1569 if (isInPrimaryFile() && // don't warn for include'd macros. 1570 Diags->getDiagnosticLevel(diag::pp_macro_not_used, 1571 MI->getDefinitionLoc()) != Diagnostic::Ignored) { 1572 MI->setIsWarnIfUnused(true); 1573 WarnUnusedMacroLocs.insert(MI->getDefinitionLoc()); 1574 } 1575 1576 // If the callbacks want to know, tell them about the macro definition. 1577 if (Callbacks) 1578 Callbacks->MacroDefined(MacroNameTok, MI); 1579} 1580 1581/// HandleUndefDirective - Implements #undef. 1582/// 1583void Preprocessor::HandleUndefDirective(Token &UndefTok) { 1584 ++NumUndefined; 1585 1586 Token MacroNameTok; 1587 ReadMacroName(MacroNameTok, 2); 1588 1589 // Error reading macro name? If so, diagnostic already issued. 1590 if (MacroNameTok.is(tok::eod)) 1591 return; 1592 1593 // Check to see if this is the last token on the #undef line. 1594 CheckEndOfDirective("undef"); 1595 1596 // Okay, we finally have a valid identifier to undef. 1597 MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo()); 1598 1599 // If the macro is not defined, this is a noop undef, just return. 1600 if (MI == 0) return; 1601 1602 if (!MI->isUsed()) 1603 Diag(MI->getDefinitionLoc(), diag::pp_macro_not_used); 1604 1605 // If the callbacks want to know, tell them about the macro #undef. 1606 if (Callbacks) 1607 Callbacks->MacroUndefined(MacroNameTok, MI); 1608 1609 if (MI->isWarnIfUnused()) 1610 WarnUnusedMacroLocs.erase(MI->getDefinitionLoc()); 1611 1612 // Free macro definition. 1613 ReleaseMacroInfo(MI); 1614 setMacroInfo(MacroNameTok.getIdentifierInfo(), 0); 1615} 1616 1617 1618//===----------------------------------------------------------------------===// 1619// Preprocessor Conditional Directive Handling. 1620//===----------------------------------------------------------------------===// 1621 1622/// HandleIfdefDirective - Implements the #ifdef/#ifndef directive. isIfndef is 1623/// true when this is a #ifndef directive. ReadAnyTokensBeforeDirective is true 1624/// if any tokens have been returned or pp-directives activated before this 1625/// #ifndef has been lexed. 1626/// 1627void Preprocessor::HandleIfdefDirective(Token &Result, bool isIfndef, 1628 bool ReadAnyTokensBeforeDirective) { 1629 ++NumIf; 1630 Token DirectiveTok = Result; 1631 1632 Token MacroNameTok; 1633 ReadMacroName(MacroNameTok); 1634 1635 // Error reading macro name? If so, diagnostic already issued. 1636 if (MacroNameTok.is(tok::eod)) { 1637 // Skip code until we get to #endif. This helps with recovery by not 1638 // emitting an error when the #endif is reached. 1639 SkipExcludedConditionalBlock(DirectiveTok.getLocation(), 1640 /*Foundnonskip*/false, /*FoundElse*/false); 1641 return; 1642 } 1643 1644 // Check to see if this is the last token on the #if[n]def line. 1645 CheckEndOfDirective(isIfndef ? "ifndef" : "ifdef"); 1646 1647 IdentifierInfo *MII = MacroNameTok.getIdentifierInfo(); 1648 MacroInfo *MI = getMacroInfo(MII); 1649 1650 if (CurPPLexer->getConditionalStackDepth() == 0) { 1651 // If the start of a top-level #ifdef and if the macro is not defined, 1652 // inform MIOpt that this might be the start of a proper include guard. 1653 // Otherwise it is some other form of unknown conditional which we can't 1654 // handle. 1655 if (!ReadAnyTokensBeforeDirective && MI == 0) { 1656 assert(isIfndef && "#ifdef shouldn't reach here"); 1657 CurPPLexer->MIOpt.EnterTopLevelIFNDEF(MII); 1658 } else 1659 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1660 } 1661 1662 // If there is a macro, process it. 1663 if (MI) // Mark it used. 1664 markMacroAsUsed(MI); 1665 1666 // Should we include the stuff contained by this directive? 1667 if (!MI == isIfndef) { 1668 // Yes, remember that we are inside a conditional, then lex the next token. 1669 CurPPLexer->pushConditionalLevel(DirectiveTok.getLocation(), 1670 /*wasskip*/false, /*foundnonskip*/true, 1671 /*foundelse*/false); 1672 } else { 1673 // No, skip the contents of this block. 1674 SkipExcludedConditionalBlock(DirectiveTok.getLocation(), 1675 /*Foundnonskip*/false, 1676 /*FoundElse*/false); 1677 } 1678 1679 if (Callbacks) { 1680 if (isIfndef) 1681 Callbacks->Ifndef(MacroNameTok); 1682 else 1683 Callbacks->Ifdef(MacroNameTok); 1684 } 1685} 1686 1687/// HandleIfDirective - Implements the #if directive. 1688/// 1689void Preprocessor::HandleIfDirective(Token &IfToken, 1690 bool ReadAnyTokensBeforeDirective) { 1691 ++NumIf; 1692 1693 // Parse and evaluate the conditional expression. 1694 IdentifierInfo *IfNDefMacro = 0; 1695 const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation(); 1696 const bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro); 1697 const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation(); 1698 1699 // If this condition is equivalent to #ifndef X, and if this is the first 1700 // directive seen, handle it for the multiple-include optimization. 1701 if (CurPPLexer->getConditionalStackDepth() == 0) { 1702 if (!ReadAnyTokensBeforeDirective && IfNDefMacro && ConditionalTrue) 1703 CurPPLexer->MIOpt.EnterTopLevelIFNDEF(IfNDefMacro); 1704 else 1705 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1706 } 1707 1708 // Should we include the stuff contained by this directive? 1709 if (ConditionalTrue) { 1710 // Yes, remember that we are inside a conditional, then lex the next token. 1711 CurPPLexer->pushConditionalLevel(IfToken.getLocation(), /*wasskip*/false, 1712 /*foundnonskip*/true, /*foundelse*/false); 1713 } else { 1714 // No, skip the contents of this block. 1715 SkipExcludedConditionalBlock(IfToken.getLocation(), /*Foundnonskip*/false, 1716 /*FoundElse*/false); 1717 } 1718 1719 if (Callbacks) 1720 Callbacks->If(SourceRange(ConditionalBegin, ConditionalEnd)); 1721} 1722 1723/// HandleEndifDirective - Implements the #endif directive. 1724/// 1725void Preprocessor::HandleEndifDirective(Token &EndifToken) { 1726 ++NumEndif; 1727 1728 // Check that this is the whole directive. 1729 CheckEndOfDirective("endif"); 1730 1731 PPConditionalInfo CondInfo; 1732 if (CurPPLexer->popConditionalLevel(CondInfo)) { 1733 // No conditionals on the stack: this is an #endif without an #if. 1734 Diag(EndifToken, diag::err_pp_endif_without_if); 1735 return; 1736 } 1737 1738 // If this the end of a top-level #endif, inform MIOpt. 1739 if (CurPPLexer->getConditionalStackDepth() == 0) 1740 CurPPLexer->MIOpt.ExitTopLevelConditional(); 1741 1742 assert(!CondInfo.WasSkipping && !CurPPLexer->LexingRawMode && 1743 "This code should only be reachable in the non-skipping case!"); 1744 1745 if (Callbacks) 1746 Callbacks->Endif(); 1747} 1748 1749/// HandleElseDirective - Implements the #else directive. 1750/// 1751void Preprocessor::HandleElseDirective(Token &Result) { 1752 ++NumElse; 1753 1754 // #else directive in a non-skipping conditional... start skipping. 1755 CheckEndOfDirective("else"); 1756 1757 PPConditionalInfo CI; 1758 if (CurPPLexer->popConditionalLevel(CI)) { 1759 Diag(Result, diag::pp_err_else_without_if); 1760 return; 1761 } 1762 1763 // If this is a top-level #else, inform the MIOpt. 1764 if (CurPPLexer->getConditionalStackDepth() == 0) 1765 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1766 1767 // If this is a #else with a #else before it, report the error. 1768 if (CI.FoundElse) Diag(Result, diag::pp_err_else_after_else); 1769 1770 // Finally, skip the rest of the contents of this block. 1771 SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, 1772 /*FoundElse*/true); 1773 1774 if (Callbacks) 1775 Callbacks->Else(); 1776} 1777 1778/// HandleElifDirective - Implements the #elif directive. 1779/// 1780void Preprocessor::HandleElifDirective(Token &ElifToken) { 1781 ++NumElse; 1782 1783 // #elif directive in a non-skipping conditional... start skipping. 1784 // We don't care what the condition is, because we will always skip it (since 1785 // the block immediately before it was included). 1786 const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation(); 1787 DiscardUntilEndOfDirective(); 1788 const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation(); 1789 1790 PPConditionalInfo CI; 1791 if (CurPPLexer->popConditionalLevel(CI)) { 1792 Diag(ElifToken, diag::pp_err_elif_without_if); 1793 return; 1794 } 1795 1796 // If this is a top-level #elif, inform the MIOpt. 1797 if (CurPPLexer->getConditionalStackDepth() == 0) 1798 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1799 1800 // If this is a #elif with a #else before it, report the error. 1801 if (CI.FoundElse) Diag(ElifToken, diag::pp_err_elif_after_else); 1802 1803 // Finally, skip the rest of the contents of this block. 1804 SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, 1805 /*FoundElse*/CI.FoundElse); 1806 1807 if (Callbacks) 1808 Callbacks->Elif(SourceRange(ConditionalBegin, ConditionalEnd)); 1809} 1810