PPDirectives.cpp revision b627c8d683c4d3facd774c432b1fdc2d35819369
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/Basic/SourceManager.h" 20#include "llvm/ADT/APInt.h" 21using namespace clang; 22 23//===----------------------------------------------------------------------===// 24// Utility Methods for Preprocessor Directive Handling. 25//===----------------------------------------------------------------------===// 26 27MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) { 28 MacroInfo *MI; 29 30 if (!MICache.empty()) { 31 MI = MICache.back(); 32 MICache.pop_back(); 33 } else 34 MI = (MacroInfo*) BP.Allocate<MacroInfo>(); 35 new (MI) MacroInfo(L); 36 return MI; 37} 38 39/// ReleaseMacroInfo - Release the specified MacroInfo. This memory will 40/// be reused for allocating new MacroInfo objects. 41void Preprocessor::ReleaseMacroInfo(MacroInfo* MI) { 42 MICache.push_back(MI); 43 MI->FreeArgumentList(BP); 44} 45 46 47/// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the 48/// current line until the tok::eom token is found. 49void Preprocessor::DiscardUntilEndOfDirective() { 50 Token Tmp; 51 do { 52 LexUnexpandedToken(Tmp); 53 } while (Tmp.isNot(tok::eom)); 54} 55 56/// ReadMacroName - Lex and validate a macro name, which occurs after a 57/// #define or #undef. This sets the token kind to eom and discards the rest 58/// of the macro line if the macro name is invalid. isDefineUndef is 1 if 59/// this is due to a a #define, 2 if #undef directive, 0 if it is something 60/// else (e.g. #ifdef). 61void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) { 62 // Read the token, don't allow macro expansion on it. 63 LexUnexpandedToken(MacroNameTok); 64 65 // Missing macro name? 66 if (MacroNameTok.is(tok::eom)) { 67 Diag(MacroNameTok, diag::err_pp_missing_macro_name); 68 return; 69 } 70 71 IdentifierInfo *II = MacroNameTok.getIdentifierInfo(); 72 if (II == 0) { 73 std::string Spelling = getSpelling(MacroNameTok); 74 const IdentifierInfo &Info = Identifiers.get(Spelling); 75 if (Info.isCPlusPlusOperatorKeyword()) 76 // C++ 2.5p2: Alternative tokens behave the same as its primary token 77 // except for their spellings. 78 Diag(MacroNameTok, diag::err_pp_operator_used_as_macro_name) << Spelling; 79 else 80 Diag(MacroNameTok, diag::err_pp_macro_not_identifier); 81 // Fall through on error. 82 } else if (isDefineUndef && II->getPPKeywordID() == tok::pp_defined) { 83 // Error if defining "defined": C99 6.10.8.4. 84 Diag(MacroNameTok, diag::err_defined_macro_name); 85 } else if (isDefineUndef && II->hasMacroDefinition() && 86 getMacroInfo(II)->isBuiltinMacro()) { 87 // Error if defining "__LINE__" and other builtins: C99 6.10.8.4. 88 if (isDefineUndef == 1) 89 Diag(MacroNameTok, diag::pp_redef_builtin_macro); 90 else 91 Diag(MacroNameTok, diag::pp_undef_builtin_macro); 92 } else { 93 // Okay, we got a good identifier node. Return it. 94 return; 95 } 96 97 // Invalid macro name, read and discard the rest of the line. Then set the 98 // token kind to tok::eom. 99 MacroNameTok.setKind(tok::eom); 100 return DiscardUntilEndOfDirective(); 101} 102 103/// CheckEndOfDirective - Ensure that the next token is a tok::eom token. If 104/// not, emit a diagnostic and consume up until the eom. 105void Preprocessor::CheckEndOfDirective(const char *DirType) { 106 Token Tmp; 107 // Lex unexpanded tokens: macros might expand to zero tokens, causing us to 108 // miss diagnosing invalid lines. 109 LexUnexpandedToken(Tmp); 110 111 // There should be no tokens after the directive, but we allow them as an 112 // extension. 113 while (Tmp.is(tok::comment)) // Skip comments in -C mode. 114 LexUnexpandedToken(Tmp); 115 116 if (Tmp.isNot(tok::eom)) { 117 Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType; 118 DiscardUntilEndOfDirective(); 119 } 120} 121 122 123 124/// SkipExcludedConditionalBlock - We just read a #if or related directive and 125/// decided that the subsequent tokens are in the #if'd out portion of the 126/// file. Lex the rest of the file, until we see an #endif. If 127/// FoundNonSkipPortion is true, then we have already emitted code for part of 128/// this #if directive, so #else/#elif blocks should never be entered. If ElseOk 129/// is true, then #else directives are ok, if not, then we have already seen one 130/// so a #else directive is a duplicate. When this returns, the caller can lex 131/// the first valid token. 132void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc, 133 bool FoundNonSkipPortion, 134 bool FoundElse) { 135 ++NumSkipped; 136 assert(CurTokenLexer == 0 && CurPPLexer && "Lexing a macro, not a file?"); 137 138 CurPPLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false, 139 FoundNonSkipPortion, FoundElse); 140 141 if (CurPTHLexer) { 142 PTHSkipExcludedConditionalBlock(); 143 return; 144 } 145 146 // Enter raw mode to disable identifier lookup (and thus macro expansion), 147 // disabling warnings, etc. 148 CurPPLexer->LexingRawMode = true; 149 Token Tok; 150 while (1) { 151 if (CurLexer) 152 CurLexer->Lex(Tok); 153 else 154 CurPTHLexer->Lex(Tok); 155 156 // If this is the end of the buffer, we have an error. 157 if (Tok.is(tok::eof)) { 158 // Emit errors for each unterminated conditional on the stack, including 159 // the current one. 160 while (!CurPPLexer->ConditionalStack.empty()) { 161 Diag(CurPPLexer->ConditionalStack.back().IfLoc, 162 diag::err_pp_unterminated_conditional); 163 CurPPLexer->ConditionalStack.pop_back(); 164 } 165 166 // Just return and let the caller lex after this #include. 167 break; 168 } 169 170 // If this token is not a preprocessor directive, just skip it. 171 if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine()) 172 continue; 173 174 // We just parsed a # character at the start of a line, so we're in 175 // directive mode. Tell the lexer this so any newlines we see will be 176 // converted into an EOM token (this terminates the macro). 177 CurPPLexer->ParsingPreprocessorDirective = true; 178 if (CurLexer) CurLexer->SetCommentRetentionState(false); 179 180 181 // Read the next token, the directive flavor. 182 LexUnexpandedToken(Tok); 183 184 // If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or 185 // something bogus), skip it. 186 if (Tok.isNot(tok::identifier)) { 187 CurPPLexer->ParsingPreprocessorDirective = false; 188 // Restore comment saving mode. 189 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 190 continue; 191 } 192 193 // If the first letter isn't i or e, it isn't intesting to us. We know that 194 // this is safe in the face of spelling differences, because there is no way 195 // to spell an i/e in a strange way that is another letter. Skipping this 196 // allows us to avoid looking up the identifier info for #define/#undef and 197 // other common directives. 198 const char *RawCharData = SourceMgr.getCharacterData(Tok.getLocation()); 199 char FirstChar = RawCharData[0]; 200 if (FirstChar >= 'a' && FirstChar <= 'z' && 201 FirstChar != 'i' && FirstChar != 'e') { 202 CurPPLexer->ParsingPreprocessorDirective = false; 203 // Restore comment saving mode. 204 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 205 continue; 206 } 207 208 // Get the identifier name without trigraphs or embedded newlines. Note 209 // that we can't use Tok.getIdentifierInfo() because its lookup is disabled 210 // when skipping. 211 // TODO: could do this with zero copies in the no-clean case by using 212 // strncmp below. 213 char Directive[20]; 214 unsigned IdLen; 215 if (!Tok.needsCleaning() && Tok.getLength() < 20) { 216 IdLen = Tok.getLength(); 217 memcpy(Directive, RawCharData, IdLen); 218 Directive[IdLen] = 0; 219 } else { 220 std::string DirectiveStr = getSpelling(Tok); 221 IdLen = DirectiveStr.size(); 222 if (IdLen >= 20) { 223 CurPPLexer->ParsingPreprocessorDirective = false; 224 // Restore comment saving mode. 225 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 226 continue; 227 } 228 memcpy(Directive, &DirectiveStr[0], IdLen); 229 Directive[IdLen] = 0; 230 FirstChar = Directive[0]; 231 } 232 233 if (FirstChar == 'i' && Directive[1] == 'f') { 234 if ((IdLen == 2) || // "if" 235 (IdLen == 5 && !strcmp(Directive+2, "def")) || // "ifdef" 236 (IdLen == 6 && !strcmp(Directive+2, "ndef"))) { // "ifndef" 237 // We know the entire #if/#ifdef/#ifndef block will be skipped, don't 238 // bother parsing the condition. 239 DiscardUntilEndOfDirective(); 240 CurPPLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true, 241 /*foundnonskip*/false, 242 /*fnddelse*/false); 243 } 244 } else if (FirstChar == 'e') { 245 if (IdLen == 5 && !strcmp(Directive+1, "ndif")) { // "endif" 246 CheckEndOfDirective("#endif"); 247 PPConditionalInfo CondInfo; 248 CondInfo.WasSkipping = true; // Silence bogus warning. 249 bool InCond = CurPPLexer->popConditionalLevel(CondInfo); 250 InCond = InCond; // Silence warning in no-asserts mode. 251 assert(!InCond && "Can't be skipping if not in a conditional!"); 252 253 // If we popped the outermost skipping block, we're done skipping! 254 if (!CondInfo.WasSkipping) 255 break; 256 } else if (IdLen == 4 && !strcmp(Directive+1, "lse")) { // "else". 257 // #else directive in a skipping conditional. If not in some other 258 // skipping conditional, and if #else hasn't already been seen, enter it 259 // as a non-skipping conditional. 260 CheckEndOfDirective("#else"); 261 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel(); 262 263 // If this is a #else with a #else before it, report the error. 264 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else); 265 266 // Note that we've seen a #else in this conditional. 267 CondInfo.FoundElse = true; 268 269 // If the conditional is at the top level, and the #if block wasn't 270 // entered, enter the #else block now. 271 if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) { 272 CondInfo.FoundNonSkip = true; 273 break; 274 } 275 } else if (IdLen == 4 && !strcmp(Directive+1, "lif")) { // "elif". 276 PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel(); 277 278 bool ShouldEnter; 279 // If this is in a skipping block or if we're already handled this #if 280 // block, don't bother parsing the condition. 281 if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) { 282 DiscardUntilEndOfDirective(); 283 ShouldEnter = false; 284 } else { 285 // Restore the value of LexingRawMode so that identifiers are 286 // looked up, etc, inside the #elif expression. 287 assert(CurPPLexer->LexingRawMode && "We have to be skipping here!"); 288 CurPPLexer->LexingRawMode = false; 289 IdentifierInfo *IfNDefMacro = 0; 290 ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro); 291 CurPPLexer->LexingRawMode = true; 292 } 293 294 // If this is a #elif with a #else before it, report the error. 295 if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else); 296 297 // If this condition is true, enter it! 298 if (ShouldEnter) { 299 CondInfo.FoundNonSkip = true; 300 break; 301 } 302 } 303 } 304 305 CurPPLexer->ParsingPreprocessorDirective = false; 306 // Restore comment saving mode. 307 if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); 308 } 309 310 // Finally, if we are out of the conditional (saw an #endif or ran off the end 311 // of the file, just stop skipping and return to lexing whatever came after 312 // the #if block. 313 CurPPLexer->LexingRawMode = false; 314} 315 316void Preprocessor::PTHSkipExcludedConditionalBlock() { 317 318 while(1) { 319 assert(CurPTHLexer); 320 assert(CurPTHLexer->LexingRawMode == false); 321 322 // Skip to the next '#else', '#elif', or #endif. 323 if (CurPTHLexer->SkipBlock()) { 324 // We have reached an #endif. Both the '#' and 'endif' tokens 325 // have been consumed by the PTHLexer. Just pop off the condition level. 326 PPConditionalInfo CondInfo; 327 bool InCond = CurPTHLexer->popConditionalLevel(CondInfo); 328 InCond = InCond; // Silence warning in no-asserts mode. 329 assert(!InCond && "Can't be skipping if not in a conditional!"); 330 break; 331 } 332 333 // We have reached a '#else' or '#elif'. Lex the next token to get 334 // the directive flavor. 335 Token Tok; 336 LexUnexpandedToken(Tok); 337 338 // We can actually look up the IdentifierInfo here since we aren't in 339 // raw mode. 340 tok::PPKeywordKind K = Tok.getIdentifierInfo()->getPPKeywordID(); 341 342 if (K == tok::pp_else) { 343 // #else: Enter the else condition. We aren't in a nested condition 344 // since we skip those. We're always in the one matching the last 345 // blocked we skipped. 346 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel(); 347 // Note that we've seen a #else in this conditional. 348 CondInfo.FoundElse = true; 349 350 // If the #if block wasn't entered then enter the #else block now. 351 if (!CondInfo.FoundNonSkip) { 352 CondInfo.FoundNonSkip = true; 353 354 // Consume the eom token. 355 CurPTHLexer->ParsingPreprocessorDirective = true; 356 LexUnexpandedToken(Tok); 357 assert(Tok.is(tok::eom)); 358 CurPTHLexer->ParsingPreprocessorDirective = false; 359 360 break; 361 } 362 363 // Otherwise skip this block. 364 continue; 365 } 366 367 assert(K == tok::pp_elif); 368 PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel(); 369 370 // If this is a #elif with a #else before it, report the error. 371 if (CondInfo.FoundElse) 372 Diag(Tok, diag::pp_err_elif_after_else); 373 374 // If this is in a skipping block or if we're already handled this #if 375 // block, don't bother parsing the condition. We just skip this block. 376 if (CondInfo.FoundNonSkip) 377 continue; 378 379 // Evaluate the condition of the #elif. 380 IdentifierInfo *IfNDefMacro = 0; 381 CurPTHLexer->ParsingPreprocessorDirective = true; 382 bool ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro); 383 CurPTHLexer->ParsingPreprocessorDirective = false; 384 385 // If this condition is true, enter it! 386 if (ShouldEnter) { 387 CondInfo.FoundNonSkip = true; 388 break; 389 } 390 391 // Otherwise, skip this block and go to the next one. 392 continue; 393 } 394} 395 396/// LookupFile - Given a "foo" or <foo> reference, look up the indicated file, 397/// return null on failure. isAngled indicates whether the file reference is 398/// for system #include's or not (i.e. using <> instead of ""). 399const FileEntry *Preprocessor::LookupFile(const char *FilenameStart, 400 const char *FilenameEnd, 401 bool isAngled, 402 const DirectoryLookup *FromDir, 403 const DirectoryLookup *&CurDir) { 404 // If the header lookup mechanism may be relative to the current file, pass in 405 // info about where the current file is. 406 const FileEntry *CurFileEnt = 0; 407 if (!FromDir) { 408 FileID FID = getCurrentFileLexer()->getFileID(); 409 CurFileEnt = SourceMgr.getFileEntryForID(FID); 410 411 // If there is no file entry associated with this file, it must be the 412 // predefines buffer. Any other file is not lexed with a normal lexer, so 413 // it won't be scanned for preprocessor directives. If we have the 414 // predefines buffer, resolve #include references (which come from the 415 // -include command line argument) as if they came from the main file, this 416 // affects file lookup etc. 417 if (CurFileEnt == 0) { 418 FID = SourceMgr.getMainFileID(); 419 CurFileEnt = SourceMgr.getFileEntryForID(FID); 420 } 421 } 422 423 // Do a standard file entry lookup. 424 CurDir = CurDirLookup; 425 const FileEntry *FE = 426 HeaderInfo.LookupFile(FilenameStart, FilenameEnd, 427 isAngled, FromDir, CurDir, CurFileEnt); 428 if (FE) return FE; 429 430 // Otherwise, see if this is a subframework header. If so, this is relative 431 // to one of the headers on the #include stack. Walk the list of the current 432 // headers on the #include stack and pass them to HeaderInfo. 433 if (IsFileLexer()) { 434 if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID()))) 435 if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, FilenameEnd, 436 CurFileEnt))) 437 return FE; 438 } 439 440 for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) { 441 IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1]; 442 if (IsFileLexer(ISEntry)) { 443 if ((CurFileEnt = 444 SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID()))) 445 if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, 446 FilenameEnd, CurFileEnt))) 447 return FE; 448 } 449 } 450 451 // Otherwise, we really couldn't find the file. 452 return 0; 453} 454 455 456//===----------------------------------------------------------------------===// 457// Preprocessor Directive Handling. 458//===----------------------------------------------------------------------===// 459 460/// HandleDirective - This callback is invoked when the lexer sees a # token 461/// at the start of a line. This consumes the directive, modifies the 462/// lexer/preprocessor state, and advances the lexer(s) so that the next token 463/// read is the correct one. 464void Preprocessor::HandleDirective(Token &Result) { 465 // FIXME: Traditional: # with whitespace before it not recognized by K&R? 466 467 // We just parsed a # character at the start of a line, so we're in directive 468 // mode. Tell the lexer this so any newlines we see will be converted into an 469 // EOM token (which terminates the directive). 470 CurPPLexer->ParsingPreprocessorDirective = true; 471 472 ++NumDirectives; 473 474 // We are about to read a token. For the multiple-include optimization FA to 475 // work, we have to remember if we had read any tokens *before* this 476 // pp-directive. 477 bool ReadAnyTokensBeforeDirective = CurPPLexer->MIOpt.getHasReadAnyTokensVal(); 478 479 // Read the next token, the directive flavor. This isn't expanded due to 480 // C99 6.10.3p8. 481 LexUnexpandedToken(Result); 482 483 // C99 6.10.3p11: Is this preprocessor directive in macro invocation? e.g.: 484 // #define A(x) #x 485 // A(abc 486 // #warning blah 487 // def) 488 // If so, the user is relying on non-portable behavior, emit a diagnostic. 489 if (InMacroArgs) 490 Diag(Result, diag::ext_embedded_directive); 491 492TryAgain: 493 switch (Result.getKind()) { 494 case tok::eom: 495 return; // null directive. 496 case tok::comment: 497 // Handle stuff like "# /*foo*/ define X" in -E -C mode. 498 LexUnexpandedToken(Result); 499 goto TryAgain; 500 501 case tok::numeric_constant: // # 7 GNU line marker directive. 502 return HandleDigitDirective(Result); 503 default: 504 IdentifierInfo *II = Result.getIdentifierInfo(); 505 if (II == 0) break; // Not an identifier. 506 507 // Ask what the preprocessor keyword ID is. 508 switch (II->getPPKeywordID()) { 509 default: break; 510 // C99 6.10.1 - Conditional Inclusion. 511 case tok::pp_if: 512 return HandleIfDirective(Result, ReadAnyTokensBeforeDirective); 513 case tok::pp_ifdef: 514 return HandleIfdefDirective(Result, false, true/*not valid for miopt*/); 515 case tok::pp_ifndef: 516 return HandleIfdefDirective(Result, true, ReadAnyTokensBeforeDirective); 517 case tok::pp_elif: 518 return HandleElifDirective(Result); 519 case tok::pp_else: 520 return HandleElseDirective(Result); 521 case tok::pp_endif: 522 return HandleEndifDirective(Result); 523 524 // C99 6.10.2 - Source File Inclusion. 525 case tok::pp_include: 526 return HandleIncludeDirective(Result); // Handle #include. 527 528 // C99 6.10.3 - Macro Replacement. 529 case tok::pp_define: 530 return HandleDefineDirective(Result); 531 case tok::pp_undef: 532 return HandleUndefDirective(Result); 533 534 // C99 6.10.4 - Line Control. 535 case tok::pp_line: 536 return HandleLineDirective(Result); 537 538 // C99 6.10.5 - Error Directive. 539 case tok::pp_error: 540 return HandleUserDiagnosticDirective(Result, false); 541 542 // C99 6.10.6 - Pragma Directive. 543 case tok::pp_pragma: 544 return HandlePragmaDirective(); 545 546 // GNU Extensions. 547 case tok::pp_import: 548 return HandleImportDirective(Result); 549 case tok::pp_include_next: 550 return HandleIncludeNextDirective(Result); 551 552 case tok::pp_warning: 553 Diag(Result, diag::ext_pp_warning_directive); 554 return HandleUserDiagnosticDirective(Result, true); 555 case tok::pp_ident: 556 return HandleIdentSCCSDirective(Result); 557 case tok::pp_sccs: 558 return HandleIdentSCCSDirective(Result); 559 case tok::pp_assert: 560 //isExtension = true; // FIXME: implement #assert 561 break; 562 case tok::pp_unassert: 563 //isExtension = true; // FIXME: implement #unassert 564 break; 565 } 566 break; 567 } 568 569 // If we reached here, the preprocessing token is not valid! 570 Diag(Result, diag::err_pp_invalid_directive); 571 572 // Read the rest of the PP line. 573 DiscardUntilEndOfDirective(); 574 575 // Okay, we're done parsing the directive. 576} 577 578/// GetLineValue - Convert a numeric token into an unsigned value, emitting 579/// Diagnostic DiagID if it is invalid, and returning the value in Val. 580static bool GetLineValue(Token &DigitTok, unsigned &Val, 581 unsigned DiagID, Preprocessor &PP) { 582 if (DigitTok.isNot(tok::numeric_constant)) { 583 PP.Diag(DigitTok, DiagID); 584 585 if (DigitTok.isNot(tok::eom)) 586 PP.DiscardUntilEndOfDirective(); 587 return true; 588 } 589 590 llvm::SmallString<64> IntegerBuffer; 591 IntegerBuffer.resize(DigitTok.getLength()); 592 const char *DigitTokBegin = &IntegerBuffer[0]; 593 unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin); 594 NumericLiteralParser Literal(DigitTokBegin, DigitTokBegin+ActualLength, 595 DigitTok.getLocation(), PP); 596 if (Literal.hadError) 597 return true; // Error already emitted. 598 599 if (Literal.isFloatingLiteral() || Literal.isImaginary) { 600 PP.Diag(DigitTok, DiagID); 601 return true; 602 } 603 604 // Parse the integer literal into Result. 605 llvm::APInt APVal(32, 0); 606 if (Literal.GetIntegerValue(APVal)) { 607 // Overflow parsing integer literal. 608 PP.Diag(DigitTok, DiagID); 609 return true; 610 } 611 Val = APVal.getZExtValue(); 612 613 // Reject 0, this is needed both by #line numbers and flags. 614 if (Val == 0) { 615 PP.Diag(DigitTok, DiagID); 616 PP.DiscardUntilEndOfDirective(); 617 return true; 618 } 619 620 return false; 621} 622 623/// HandleLineDirective - Handle #line directive: C99 6.10.4. The two 624/// acceptable forms are: 625/// # line digit-sequence 626/// # line digit-sequence "s-char-sequence" 627void Preprocessor::HandleLineDirective(Token &Tok) { 628 // Read the line # and string argument. Per C99 6.10.4p5, these tokens are 629 // expanded. 630 Token DigitTok; 631 Lex(DigitTok); 632 633 // Validate the number and convert it to an unsigned. 634 unsigned LineNo; 635 if (GetLineValue(DigitTok, LineNo, diag::err_pp_line_requires_integer, *this)) 636 return; 637 638 // Enforce C99 6.10.4p3: "The digit sequence shall not specify ... a 639 // number greater than 2147483647". C90 requires that the line # be <= 32767. 640 unsigned LineLimit = Features.C99 ? 2147483648U : 32768U; 641 if (LineNo >= LineLimit) 642 Diag(DigitTok, diag::ext_pp_line_too_big) << LineLimit; 643 644 int FilenameID = -1; 645 Token StrTok; 646 Lex(StrTok); 647 648 // If the StrTok is "eom", then it wasn't present. Otherwise, it must be a 649 // string followed by eom. 650 if (StrTok.is(tok::eom)) 651 ; // ok 652 else if (StrTok.isNot(tok::string_literal)) { 653 Diag(StrTok, diag::err_pp_line_invalid_filename); 654 DiscardUntilEndOfDirective(); 655 return; 656 } else { 657 // Parse and validate the string, converting it into a unique ID. 658 StringLiteralParser Literal(&StrTok, 1, *this); 659 assert(!Literal.AnyWide && "Didn't allow wide strings in"); 660 if (Literal.hadError) 661 return DiscardUntilEndOfDirective(); 662 if (Literal.Pascal) { 663 Diag(StrTok, diag::err_pp_linemarker_invalid_filename); 664 return DiscardUntilEndOfDirective(); 665 } 666 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(), 667 Literal.GetStringLength()); 668 669 // Verify that there is nothing after the string, other than EOM. 670 CheckEndOfDirective("#line"); 671 } 672 673 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID); 674} 675 676/// ReadLineMarkerFlags - Parse and validate any flags at the end of a GNU line 677/// marker directive. 678static bool ReadLineMarkerFlags(bool &IsFileEntry, bool &IsFileExit, 679 bool &IsSystemHeader, bool &IsExternCHeader, 680 Preprocessor &PP) { 681 unsigned FlagVal; 682 Token FlagTok; 683 PP.Lex(FlagTok); 684 if (FlagTok.is(tok::eom)) return false; 685 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP)) 686 return true; 687 688 if (FlagVal == 1) { 689 IsFileEntry = true; 690 691 PP.Lex(FlagTok); 692 if (FlagTok.is(tok::eom)) return false; 693 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP)) 694 return true; 695 } else if (FlagVal == 2) { 696 IsFileExit = true; 697 698 SourceManager &SM = PP.getSourceManager(); 699 // If we are leaving the current presumed file, check to make sure the 700 // presumed include stack isn't empty! 701 FileID CurFileID = 702 SM.getDecomposedInstantiationLoc(FlagTok.getLocation()).first; 703 PresumedLoc PLoc = SM.getPresumedLoc(FlagTok.getLocation()); 704 705 // If there is no include loc (main file) or if the include loc is in a 706 // different physical file, then we aren't in a "1" line marker flag region. 707 SourceLocation IncLoc = PLoc.getIncludeLoc(); 708 if (IncLoc.isInvalid() || 709 SM.getDecomposedInstantiationLoc(IncLoc).first != CurFileID) { 710 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_pop); 711 PP.DiscardUntilEndOfDirective(); 712 return true; 713 } 714 715 PP.Lex(FlagTok); 716 if (FlagTok.is(tok::eom)) return false; 717 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP)) 718 return true; 719 } 720 721 // We must have 3 if there are still flags. 722 if (FlagVal != 3) { 723 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); 724 PP.DiscardUntilEndOfDirective(); 725 return true; 726 } 727 728 IsSystemHeader = true; 729 730 PP.Lex(FlagTok); 731 if (FlagTok.is(tok::eom)) return false; 732 if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP)) 733 return true; 734 735 // We must have 4 if there is yet another flag. 736 if (FlagVal != 4) { 737 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); 738 PP.DiscardUntilEndOfDirective(); 739 return true; 740 } 741 742 IsExternCHeader = true; 743 744 PP.Lex(FlagTok); 745 if (FlagTok.is(tok::eom)) return false; 746 747 // There are no more valid flags here. 748 PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); 749 PP.DiscardUntilEndOfDirective(); 750 return true; 751} 752 753/// HandleDigitDirective - Handle a GNU line marker directive, whose syntax is 754/// one of the following forms: 755/// 756/// # 42 757/// # 42 "file" ('1' | '2')? 758/// # 42 "file" ('1' | '2')? '3' '4'? 759/// 760void Preprocessor::HandleDigitDirective(Token &DigitTok) { 761 // Validate the number and convert it to an unsigned. GNU does not have a 762 // line # limit other than it fit in 32-bits. 763 unsigned LineNo; 764 if (GetLineValue(DigitTok, LineNo, diag::err_pp_linemarker_requires_integer, 765 *this)) 766 return; 767 768 Token StrTok; 769 Lex(StrTok); 770 771 bool IsFileEntry = false, IsFileExit = false; 772 bool IsSystemHeader = false, IsExternCHeader = false; 773 int FilenameID = -1; 774 775 // If the StrTok is "eom", then it wasn't present. Otherwise, it must be a 776 // string followed by eom. 777 if (StrTok.is(tok::eom)) 778 ; // ok 779 else if (StrTok.isNot(tok::string_literal)) { 780 Diag(StrTok, diag::err_pp_linemarker_invalid_filename); 781 return DiscardUntilEndOfDirective(); 782 } else { 783 // Parse and validate the string, converting it into a unique ID. 784 StringLiteralParser Literal(&StrTok, 1, *this); 785 assert(!Literal.AnyWide && "Didn't allow wide strings in"); 786 if (Literal.hadError) 787 return DiscardUntilEndOfDirective(); 788 if (Literal.Pascal) { 789 Diag(StrTok, diag::err_pp_linemarker_invalid_filename); 790 return DiscardUntilEndOfDirective(); 791 } 792 FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(), 793 Literal.GetStringLength()); 794 795 // If a filename was present, read any flags that are present. 796 if (ReadLineMarkerFlags(IsFileEntry, IsFileExit, 797 IsSystemHeader, IsExternCHeader, *this)) 798 return; 799 } 800 801 // Create a line note with this information. 802 SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID, 803 IsFileEntry, IsFileExit, 804 IsSystemHeader, IsExternCHeader); 805} 806 807 808/// HandleUserDiagnosticDirective - Handle a #warning or #error directive. 809/// 810void Preprocessor::HandleUserDiagnosticDirective(Token &Tok, 811 bool isWarning) { 812 // PTH doesn't emit #warning or #error directives. 813 if (CurPTHLexer) 814 return CurPTHLexer->DiscardToEndOfLine(); 815 816 // Read the rest of the line raw. We do this because we don't want macros 817 // to be expanded and we don't require that the tokens be valid preprocessing 818 // tokens. For example, this is allowed: "#warning ` 'foo". GCC does 819 // collapse multiple consequtive white space between tokens, but this isn't 820 // specified by the standard. 821 std::string Message = CurLexer->ReadToEndOfLine(); 822 if (isWarning) 823 Diag(Tok, diag::pp_hash_warning) << Message; 824 else 825 Diag(Tok, diag::err_pp_hash_error) << Message; 826} 827 828/// HandleIdentSCCSDirective - Handle a #ident/#sccs directive. 829/// 830void Preprocessor::HandleIdentSCCSDirective(Token &Tok) { 831 // Yes, this directive is an extension. 832 Diag(Tok, diag::ext_pp_ident_directive); 833 834 // Read the string argument. 835 Token StrTok; 836 Lex(StrTok); 837 838 // If the token kind isn't a string, it's a malformed directive. 839 if (StrTok.isNot(tok::string_literal) && 840 StrTok.isNot(tok::wide_string_literal)) { 841 Diag(StrTok, diag::err_pp_malformed_ident); 842 if (StrTok.isNot(tok::eom)) 843 DiscardUntilEndOfDirective(); 844 return; 845 } 846 847 // Verify that there is nothing after the string, other than EOM. 848 CheckEndOfDirective("#ident"); 849 850 if (Callbacks) 851 Callbacks->Ident(Tok.getLocation(), getSpelling(StrTok)); 852} 853 854//===----------------------------------------------------------------------===// 855// Preprocessor Include Directive Handling. 856//===----------------------------------------------------------------------===// 857 858/// GetIncludeFilenameSpelling - Turn the specified lexer token into a fully 859/// checked and spelled filename, e.g. as an operand of #include. This returns 860/// true if the input filename was in <>'s or false if it were in ""'s. The 861/// caller is expected to provide a buffer that is large enough to hold the 862/// spelling of the filename, but is also expected to handle the case when 863/// this method decides to use a different buffer. 864bool Preprocessor::GetIncludeFilenameSpelling(SourceLocation Loc, 865 const char *&BufStart, 866 const char *&BufEnd) { 867 // Get the text form of the filename. 868 assert(BufStart != BufEnd && "Can't have tokens with empty spellings!"); 869 870 // Make sure the filename is <x> or "x". 871 bool isAngled; 872 if (BufStart[0] == '<') { 873 if (BufEnd[-1] != '>') { 874 Diag(Loc, diag::err_pp_expects_filename); 875 BufStart = 0; 876 return true; 877 } 878 isAngled = true; 879 } else if (BufStart[0] == '"') { 880 if (BufEnd[-1] != '"') { 881 Diag(Loc, diag::err_pp_expects_filename); 882 BufStart = 0; 883 return true; 884 } 885 isAngled = false; 886 } else { 887 Diag(Loc, diag::err_pp_expects_filename); 888 BufStart = 0; 889 return true; 890 } 891 892 // Diagnose #include "" as invalid. 893 if (BufEnd-BufStart <= 2) { 894 Diag(Loc, diag::err_pp_empty_filename); 895 BufStart = 0; 896 return ""; 897 } 898 899 // Skip the brackets. 900 ++BufStart; 901 --BufEnd; 902 return isAngled; 903} 904 905/// ConcatenateIncludeName - Handle cases where the #include name is expanded 906/// from a macro as multiple tokens, which need to be glued together. This 907/// occurs for code like: 908/// #define FOO <a/b.h> 909/// #include FOO 910/// because in this case, "<a/b.h>" is returned as 7 tokens, not one. 911/// 912/// This code concatenates and consumes tokens up to the '>' token. It returns 913/// false if the > was found, otherwise it returns true if it finds and consumes 914/// the EOM marker. 915static bool ConcatenateIncludeName(llvm::SmallVector<char, 128> &FilenameBuffer, 916 Preprocessor &PP) { 917 Token CurTok; 918 919 PP.Lex(CurTok); 920 while (CurTok.isNot(tok::eom)) { 921 // Append the spelling of this token to the buffer. If there was a space 922 // before it, add it now. 923 if (CurTok.hasLeadingSpace()) 924 FilenameBuffer.push_back(' '); 925 926 // Get the spelling of the token, directly into FilenameBuffer if possible. 927 unsigned PreAppendSize = FilenameBuffer.size(); 928 FilenameBuffer.resize(PreAppendSize+CurTok.getLength()); 929 930 const char *BufPtr = &FilenameBuffer[PreAppendSize]; 931 unsigned ActualLen = PP.getSpelling(CurTok, BufPtr); 932 933 // If the token was spelled somewhere else, copy it into FilenameBuffer. 934 if (BufPtr != &FilenameBuffer[PreAppendSize]) 935 memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen); 936 937 // Resize FilenameBuffer to the correct size. 938 if (CurTok.getLength() != ActualLen) 939 FilenameBuffer.resize(PreAppendSize+ActualLen); 940 941 // If we found the '>' marker, return success. 942 if (CurTok.is(tok::greater)) 943 return false; 944 945 PP.Lex(CurTok); 946 } 947 948 // If we hit the eom marker, emit an error and return true so that the caller 949 // knows the EOM has been read. 950 PP.Diag(CurTok.getLocation(), diag::err_pp_expects_filename); 951 return true; 952} 953 954/// HandleIncludeDirective - The "#include" tokens have just been read, read the 955/// file to be included from the lexer, then include it! This is a common 956/// routine with functionality shared between #include, #include_next and 957/// #import. LookupFrom is set when this is a #include_next directive, it 958/// specifies the file to start searching from. 959void Preprocessor::HandleIncludeDirective(Token &IncludeTok, 960 const DirectoryLookup *LookupFrom, 961 bool isImport) { 962 963 Token FilenameTok; 964 CurPPLexer->LexIncludeFilename(FilenameTok); 965 966 // Reserve a buffer to get the spelling. 967 llvm::SmallVector<char, 128> FilenameBuffer; 968 const char *FilenameStart, *FilenameEnd; 969 970 switch (FilenameTok.getKind()) { 971 case tok::eom: 972 // If the token kind is EOM, the error has already been diagnosed. 973 return; 974 975 case tok::angle_string_literal: 976 case tok::string_literal: { 977 FilenameBuffer.resize(FilenameTok.getLength()); 978 FilenameStart = &FilenameBuffer[0]; 979 unsigned Len = getSpelling(FilenameTok, FilenameStart); 980 FilenameEnd = FilenameStart+Len; 981 break; 982 } 983 984 case tok::less: 985 // This could be a <foo/bar.h> file coming from a macro expansion. In this 986 // case, glue the tokens together into FilenameBuffer and interpret those. 987 FilenameBuffer.push_back('<'); 988 if (ConcatenateIncludeName(FilenameBuffer, *this)) 989 return; // Found <eom> but no ">"? Diagnostic already emitted. 990 FilenameStart = &FilenameBuffer[0]; 991 FilenameEnd = &FilenameBuffer[FilenameBuffer.size()]; 992 break; 993 default: 994 Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename); 995 DiscardUntilEndOfDirective(); 996 return; 997 } 998 999 bool isAngled = GetIncludeFilenameSpelling(FilenameTok.getLocation(), 1000 FilenameStart, FilenameEnd); 1001 // If GetIncludeFilenameSpelling set the start ptr to null, there was an 1002 // error. 1003 if (FilenameStart == 0) { 1004 DiscardUntilEndOfDirective(); 1005 return; 1006 } 1007 1008 // Verify that there is nothing after the filename, other than EOM. Use the 1009 // preprocessor to lex this in case lexing the filename entered a macro. 1010 CheckEndOfDirective("#include"); 1011 1012 // Check that we don't have infinite #include recursion. 1013 if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1) { 1014 Diag(FilenameTok, diag::err_pp_include_too_deep); 1015 return; 1016 } 1017 1018 // Search include directories. 1019 const DirectoryLookup *CurDir; 1020 const FileEntry *File = LookupFile(FilenameStart, FilenameEnd, 1021 isAngled, LookupFrom, CurDir); 1022 if (File == 0) { 1023 Diag(FilenameTok, diag::err_pp_file_not_found) 1024 << std::string(FilenameStart, FilenameEnd); 1025 return; 1026 } 1027 1028 // Ask HeaderInfo if we should enter this #include file. If not, #including 1029 // this file will have no effect. 1030 if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) 1031 return; 1032 1033 // The #included file will be considered to be a system header if either it is 1034 // in a system include directory, or if the #includer is a system include 1035 // header. 1036 SrcMgr::CharacteristicKind FileCharacter = 1037 std::max(HeaderInfo.getFileDirFlavor(File), 1038 SourceMgr.getFileCharacteristic(FilenameTok.getLocation())); 1039 1040 // Look up the file, create a File ID for it. 1041 FileID FID = SourceMgr.createFileID(File, FilenameTok.getLocation(), 1042 FileCharacter); 1043 if (FID.isInvalid()) { 1044 Diag(FilenameTok, diag::err_pp_file_not_found) 1045 << std::string(FilenameStart, FilenameEnd); 1046 return; 1047 } 1048 1049 // Finally, if all is good, enter the new file! 1050 EnterSourceFile(FID, CurDir); 1051} 1052 1053/// HandleIncludeNextDirective - Implements #include_next. 1054/// 1055void Preprocessor::HandleIncludeNextDirective(Token &IncludeNextTok) { 1056 Diag(IncludeNextTok, diag::ext_pp_include_next_directive); 1057 1058 // #include_next is like #include, except that we start searching after 1059 // the current found directory. If we can't do this, issue a 1060 // diagnostic. 1061 const DirectoryLookup *Lookup = CurDirLookup; 1062 if (isInPrimaryFile()) { 1063 Lookup = 0; 1064 Diag(IncludeNextTok, diag::pp_include_next_in_primary); 1065 } else if (Lookup == 0) { 1066 Diag(IncludeNextTok, diag::pp_include_next_absolute_path); 1067 } else { 1068 // Start looking up in the next directory. 1069 ++Lookup; 1070 } 1071 1072 return HandleIncludeDirective(IncludeNextTok, Lookup); 1073} 1074 1075/// HandleImportDirective - Implements #import. 1076/// 1077void Preprocessor::HandleImportDirective(Token &ImportTok) { 1078 if (!Features.ObjC1) // #import is standard for ObjC. 1079 Diag(ImportTok, diag::ext_pp_import_directive); 1080 1081 return HandleIncludeDirective(ImportTok, 0, true); 1082} 1083 1084//===----------------------------------------------------------------------===// 1085// Preprocessor Macro Directive Handling. 1086//===----------------------------------------------------------------------===// 1087 1088/// ReadMacroDefinitionArgList - The ( starting an argument list of a macro 1089/// definition has just been read. Lex the rest of the arguments and the 1090/// closing ), updating MI with what we learn. Return true if an error occurs 1091/// parsing the arg list. 1092bool Preprocessor::ReadMacroDefinitionArgList(MacroInfo *MI) { 1093 llvm::SmallVector<IdentifierInfo*, 32> Arguments; 1094 1095 Token Tok; 1096 while (1) { 1097 LexUnexpandedToken(Tok); 1098 switch (Tok.getKind()) { 1099 case tok::r_paren: 1100 // Found the end of the argument list. 1101 if (Arguments.empty()) // #define FOO() 1102 return false; 1103 // Otherwise we have #define FOO(A,) 1104 Diag(Tok, diag::err_pp_expected_ident_in_arg_list); 1105 return true; 1106 case tok::ellipsis: // #define X(... -> C99 varargs 1107 // Warn if use of C99 feature in non-C99 mode. 1108 if (!Features.C99) Diag(Tok, diag::ext_variadic_macro); 1109 1110 // Lex the token after the identifier. 1111 LexUnexpandedToken(Tok); 1112 if (Tok.isNot(tok::r_paren)) { 1113 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); 1114 return true; 1115 } 1116 // Add the __VA_ARGS__ identifier as an argument. 1117 Arguments.push_back(Ident__VA_ARGS__); 1118 MI->setIsC99Varargs(); 1119 MI->setArgumentList(&Arguments[0], Arguments.size(), BP); 1120 return false; 1121 case tok::eom: // #define X( 1122 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); 1123 return true; 1124 default: 1125 // Handle keywords and identifiers here to accept things like 1126 // #define Foo(for) for. 1127 IdentifierInfo *II = Tok.getIdentifierInfo(); 1128 if (II == 0) { 1129 // #define X(1 1130 Diag(Tok, diag::err_pp_invalid_tok_in_arg_list); 1131 return true; 1132 } 1133 1134 // If this is already used as an argument, it is used multiple times (e.g. 1135 // #define X(A,A. 1136 if (std::find(Arguments.begin(), Arguments.end(), II) != 1137 Arguments.end()) { // C99 6.10.3p6 1138 Diag(Tok, diag::err_pp_duplicate_name_in_arg_list) << II; 1139 return true; 1140 } 1141 1142 // Add the argument to the macro info. 1143 Arguments.push_back(II); 1144 1145 // Lex the token after the identifier. 1146 LexUnexpandedToken(Tok); 1147 1148 switch (Tok.getKind()) { 1149 default: // #define X(A B 1150 Diag(Tok, diag::err_pp_expected_comma_in_arg_list); 1151 return true; 1152 case tok::r_paren: // #define X(A) 1153 MI->setArgumentList(&Arguments[0], Arguments.size(), BP); 1154 return false; 1155 case tok::comma: // #define X(A, 1156 break; 1157 case tok::ellipsis: // #define X(A... -> GCC extension 1158 // Diagnose extension. 1159 Diag(Tok, diag::ext_named_variadic_macro); 1160 1161 // Lex the token after the identifier. 1162 LexUnexpandedToken(Tok); 1163 if (Tok.isNot(tok::r_paren)) { 1164 Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); 1165 return true; 1166 } 1167 1168 MI->setIsGNUVarargs(); 1169 MI->setArgumentList(&Arguments[0], Arguments.size(), BP); 1170 return false; 1171 } 1172 } 1173 } 1174} 1175 1176/// HandleDefineDirective - Implements #define. This consumes the entire macro 1177/// line then lets the caller lex the next real token. 1178void Preprocessor::HandleDefineDirective(Token &DefineTok) { 1179 ++NumDefined; 1180 1181 Token MacroNameTok; 1182 ReadMacroName(MacroNameTok, 1); 1183 1184 // Error reading macro name? If so, diagnostic already issued. 1185 if (MacroNameTok.is(tok::eom)) 1186 return; 1187 1188 // If we are supposed to keep comments in #defines, reenable comment saving 1189 // mode. 1190 if (CurLexer) CurLexer->SetCommentRetentionState(KeepMacroComments); 1191 1192 // Create the new macro. 1193 MacroInfo *MI = AllocateMacroInfo(MacroNameTok.getLocation()); 1194 1195 Token Tok; 1196 LexUnexpandedToken(Tok); 1197 1198 // If this is a function-like macro definition, parse the argument list, 1199 // marking each of the identifiers as being used as macro arguments. Also, 1200 // check other constraints on the first token of the macro body. 1201 if (Tok.is(tok::eom)) { 1202 // If there is no body to this macro, we have no special handling here. 1203 } else if (Tok.is(tok::l_paren) && !Tok.hasLeadingSpace()) { 1204 // This is a function-like macro definition. Read the argument list. 1205 MI->setIsFunctionLike(); 1206 if (ReadMacroDefinitionArgList(MI)) { 1207 // Forget about MI. 1208 ReleaseMacroInfo(MI); 1209 // Throw away the rest of the line. 1210 if (CurPPLexer->ParsingPreprocessorDirective) 1211 DiscardUntilEndOfDirective(); 1212 return; 1213 } 1214 1215 // Read the first token after the arg list for down below. 1216 LexUnexpandedToken(Tok); 1217 } else if (!Tok.hasLeadingSpace()) { 1218 // C99 requires whitespace between the macro definition and the body. Emit 1219 // a diagnostic for something like "#define X+". 1220 if (Features.C99) { 1221 Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name); 1222 } else { 1223 // FIXME: C90/C++ do not get this diagnostic, but it does get a similar 1224 // one in some cases! 1225 } 1226 } else { 1227 // This is a normal token with leading space. Clear the leading space 1228 // marker on the first token to get proper expansion. 1229 Tok.clearFlag(Token::LeadingSpace); 1230 } 1231 1232 // If this is a definition of a variadic C99 function-like macro, not using 1233 // the GNU named varargs extension, enabled __VA_ARGS__. 1234 1235 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. 1236 // This gets unpoisoned where it is allowed. 1237 assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!"); 1238 if (MI->isC99Varargs()) 1239 Ident__VA_ARGS__->setIsPoisoned(false); 1240 1241 // Read the rest of the macro body. 1242 if (MI->isObjectLike()) { 1243 // Object-like macros are very simple, just read their body. 1244 while (Tok.isNot(tok::eom)) { 1245 MI->AddTokenToBody(Tok); 1246 // Get the next token of the macro. 1247 LexUnexpandedToken(Tok); 1248 } 1249 1250 } else { 1251 // Otherwise, read the body of a function-like macro. This has to validate 1252 // the # (stringize) operator. 1253 while (Tok.isNot(tok::eom)) { 1254 MI->AddTokenToBody(Tok); 1255 1256 // Check C99 6.10.3.2p1: ensure that # operators are followed by macro 1257 // parameters in function-like macro expansions. 1258 if (Tok.isNot(tok::hash)) { 1259 // Get the next token of the macro. 1260 LexUnexpandedToken(Tok); 1261 continue; 1262 } 1263 1264 // Get the next token of the macro. 1265 LexUnexpandedToken(Tok); 1266 1267 // Not a macro arg identifier? 1268 if (!Tok.getIdentifierInfo() || 1269 MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) { 1270 Diag(Tok, diag::err_pp_stringize_not_parameter); 1271 ReleaseMacroInfo(MI); 1272 1273 // Disable __VA_ARGS__ again. 1274 Ident__VA_ARGS__->setIsPoisoned(true); 1275 return; 1276 } 1277 1278 // Things look ok, add the param name token to the macro. 1279 MI->AddTokenToBody(Tok); 1280 1281 // Get the next token of the macro. 1282 LexUnexpandedToken(Tok); 1283 } 1284 } 1285 1286 1287 // Disable __VA_ARGS__ again. 1288 Ident__VA_ARGS__->setIsPoisoned(true); 1289 1290 // Check that there is no paste (##) operator at the begining or end of the 1291 // replacement list. 1292 unsigned NumTokens = MI->getNumTokens(); 1293 if (NumTokens != 0) { 1294 if (MI->getReplacementToken(0).is(tok::hashhash)) { 1295 Diag(MI->getReplacementToken(0), diag::err_paste_at_start); 1296 ReleaseMacroInfo(MI); 1297 return; 1298 } 1299 if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) { 1300 Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end); 1301 ReleaseMacroInfo(MI); 1302 return; 1303 } 1304 } 1305 1306 // If this is the primary source file, remember that this macro hasn't been 1307 // used yet. 1308 if (isInPrimaryFile()) 1309 MI->setIsUsed(false); 1310 1311 // Finally, if this identifier already had a macro defined for it, verify that 1312 // the macro bodies are identical and free the old definition. 1313 if (MacroInfo *OtherMI = getMacroInfo(MacroNameTok.getIdentifierInfo())) { 1314 // It is very common for system headers to have tons of macro redefinitions 1315 // and for warnings to be disabled in system headers. If this is the case, 1316 // then don't bother calling MacroInfo::isIdenticalTo. 1317 if (!Diags.getSuppressSystemWarnings() || 1318 !SourceMgr.isInSystemHeader(DefineTok.getLocation())) { 1319 if (!OtherMI->isUsed()) 1320 Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used); 1321 1322 // Macros must be identical. This means all tokes and whitespace 1323 // separation must be the same. C99 6.10.3.2. 1324 if (!MI->isIdenticalTo(*OtherMI, *this)) { 1325 Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef) 1326 << MacroNameTok.getIdentifierInfo(); 1327 Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition); 1328 } 1329 } 1330 1331 ReleaseMacroInfo(OtherMI); 1332 } 1333 1334 setMacroInfo(MacroNameTok.getIdentifierInfo(), MI); 1335} 1336 1337/// HandleUndefDirective - Implements #undef. 1338/// 1339void Preprocessor::HandleUndefDirective(Token &UndefTok) { 1340 ++NumUndefined; 1341 1342 Token MacroNameTok; 1343 ReadMacroName(MacroNameTok, 2); 1344 1345 // Error reading macro name? If so, diagnostic already issued. 1346 if (MacroNameTok.is(tok::eom)) 1347 return; 1348 1349 // Check to see if this is the last token on the #undef line. 1350 CheckEndOfDirective("#undef"); 1351 1352 // Okay, we finally have a valid identifier to undef. 1353 MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo()); 1354 1355 // If the macro is not defined, this is a noop undef, just return. 1356 if (MI == 0) return; 1357 1358 if (!MI->isUsed()) 1359 Diag(MI->getDefinitionLoc(), diag::pp_macro_not_used); 1360 1361 // Free macro definition. 1362 ReleaseMacroInfo(MI); 1363 setMacroInfo(MacroNameTok.getIdentifierInfo(), 0); 1364} 1365 1366 1367//===----------------------------------------------------------------------===// 1368// Preprocessor Conditional Directive Handling. 1369//===----------------------------------------------------------------------===// 1370 1371/// HandleIfdefDirective - Implements the #ifdef/#ifndef directive. isIfndef is 1372/// true when this is a #ifndef directive. ReadAnyTokensBeforeDirective is true 1373/// if any tokens have been returned or pp-directives activated before this 1374/// #ifndef has been lexed. 1375/// 1376void Preprocessor::HandleIfdefDirective(Token &Result, bool isIfndef, 1377 bool ReadAnyTokensBeforeDirective) { 1378 ++NumIf; 1379 Token DirectiveTok = Result; 1380 1381 Token MacroNameTok; 1382 ReadMacroName(MacroNameTok); 1383 1384 // Error reading macro name? If so, diagnostic already issued. 1385 if (MacroNameTok.is(tok::eom)) { 1386 // Skip code until we get to #endif. This helps with recovery by not 1387 // emitting an error when the #endif is reached. 1388 SkipExcludedConditionalBlock(DirectiveTok.getLocation(), 1389 /*Foundnonskip*/false, /*FoundElse*/false); 1390 return; 1391 } 1392 1393 // Check to see if this is the last token on the #if[n]def line. 1394 CheckEndOfDirective(isIfndef ? "#ifndef" : "#ifdef"); 1395 1396 if (CurPPLexer->getConditionalStackDepth() == 0) { 1397 // If the start of a top-level #ifdef, inform MIOpt. 1398 if (!ReadAnyTokensBeforeDirective) { 1399 assert(isIfndef && "#ifdef shouldn't reach here"); 1400 CurPPLexer->MIOpt.EnterTopLevelIFNDEF(MacroNameTok.getIdentifierInfo()); 1401 } else 1402 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1403 } 1404 1405 IdentifierInfo *MII = MacroNameTok.getIdentifierInfo(); 1406 MacroInfo *MI = getMacroInfo(MII); 1407 1408 // If there is a macro, process it. 1409 if (MI) // Mark it used. 1410 MI->setIsUsed(true); 1411 1412 // Should we include the stuff contained by this directive? 1413 if (!MI == isIfndef) { 1414 // Yes, remember that we are inside a conditional, then lex the next token. 1415 CurPPLexer->pushConditionalLevel(DirectiveTok.getLocation(), /*wasskip*/false, 1416 /*foundnonskip*/true, /*foundelse*/false); 1417 } else { 1418 // No, skip the contents of this block and return the first token after it. 1419 SkipExcludedConditionalBlock(DirectiveTok.getLocation(), 1420 /*Foundnonskip*/false, 1421 /*FoundElse*/false); 1422 } 1423} 1424 1425/// HandleIfDirective - Implements the #if directive. 1426/// 1427void Preprocessor::HandleIfDirective(Token &IfToken, 1428 bool ReadAnyTokensBeforeDirective) { 1429 ++NumIf; 1430 1431 // Parse and evaluation the conditional expression. 1432 IdentifierInfo *IfNDefMacro = 0; 1433 bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro); 1434 1435 1436 // If this condition is equivalent to #ifndef X, and if this is the first 1437 // directive seen, handle it for the multiple-include optimization. 1438 if (CurPPLexer->getConditionalStackDepth() == 0) { 1439 if (!ReadAnyTokensBeforeDirective && IfNDefMacro) 1440 CurPPLexer->MIOpt.EnterTopLevelIFNDEF(IfNDefMacro); 1441 else 1442 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1443 } 1444 1445 // Should we include the stuff contained by this directive? 1446 if (ConditionalTrue) { 1447 // Yes, remember that we are inside a conditional, then lex the next token. 1448 CurPPLexer->pushConditionalLevel(IfToken.getLocation(), /*wasskip*/false, 1449 /*foundnonskip*/true, /*foundelse*/false); 1450 } else { 1451 // No, skip the contents of this block and return the first token after it. 1452 SkipExcludedConditionalBlock(IfToken.getLocation(), /*Foundnonskip*/false, 1453 /*FoundElse*/false); 1454 } 1455} 1456 1457/// HandleEndifDirective - Implements the #endif directive. 1458/// 1459void Preprocessor::HandleEndifDirective(Token &EndifToken) { 1460 ++NumEndif; 1461 1462 // Check that this is the whole directive. 1463 CheckEndOfDirective("#endif"); 1464 1465 PPConditionalInfo CondInfo; 1466 if (CurPPLexer->popConditionalLevel(CondInfo)) { 1467 // No conditionals on the stack: this is an #endif without an #if. 1468 Diag(EndifToken, diag::err_pp_endif_without_if); 1469 return; 1470 } 1471 1472 // If this the end of a top-level #endif, inform MIOpt. 1473 if (CurPPLexer->getConditionalStackDepth() == 0) 1474 CurPPLexer->MIOpt.ExitTopLevelConditional(); 1475 1476 assert(!CondInfo.WasSkipping && !CurPPLexer->LexingRawMode && 1477 "This code should only be reachable in the non-skipping case!"); 1478} 1479 1480 1481void Preprocessor::HandleElseDirective(Token &Result) { 1482 ++NumElse; 1483 1484 // #else directive in a non-skipping conditional... start skipping. 1485 CheckEndOfDirective("#else"); 1486 1487 PPConditionalInfo CI; 1488 if (CurPPLexer->popConditionalLevel(CI)) { 1489 Diag(Result, diag::pp_err_else_without_if); 1490 return; 1491 } 1492 1493 // If this is a top-level #else, inform the MIOpt. 1494 if (CurPPLexer->getConditionalStackDepth() == 0) 1495 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1496 1497 // If this is a #else with a #else before it, report the error. 1498 if (CI.FoundElse) Diag(Result, diag::pp_err_else_after_else); 1499 1500 // Finally, skip the rest of the contents of this block and return the first 1501 // token after it. 1502 return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, 1503 /*FoundElse*/true); 1504} 1505 1506void Preprocessor::HandleElifDirective(Token &ElifToken) { 1507 ++NumElse; 1508 1509 // #elif directive in a non-skipping conditional... start skipping. 1510 // We don't care what the condition is, because we will always skip it (since 1511 // the block immediately before it was included). 1512 DiscardUntilEndOfDirective(); 1513 1514 PPConditionalInfo CI; 1515 if (CurPPLexer->popConditionalLevel(CI)) { 1516 Diag(ElifToken, diag::pp_err_elif_without_if); 1517 return; 1518 } 1519 1520 // If this is a top-level #elif, inform the MIOpt. 1521 if (CurPPLexer->getConditionalStackDepth() == 0) 1522 CurPPLexer->MIOpt.EnterTopLevelConditional(); 1523 1524 // If this is a #elif with a #else before it, report the error. 1525 if (CI.FoundElse) Diag(ElifToken, diag::pp_err_elif_after_else); 1526 1527 // Finally, skip the rest of the contents of this block and return the first 1528 // token after it. 1529 return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, 1530 /*FoundElse*/CI.FoundElse); 1531} 1532 1533