| //===--- PPDirectives.cpp - Directive Handling for Preprocessor -----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements # directive processing for the Preprocessor. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Lex/Preprocessor.h" |
| #include "clang/Lex/LiteralSupport.h" |
| #include "clang/Lex/HeaderSearch.h" |
| #include "clang/Lex/MacroInfo.h" |
| #include "clang/Lex/LexDiagnostic.h" |
| #include "clang/Lex/CodeCompletionHandler.h" |
| #include "clang/Lex/Pragma.h" |
| #include "clang/Basic/FileManager.h" |
| #include "clang/Basic/SourceManager.h" |
| #include "llvm/ADT/APInt.h" |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // Utility Methods for Preprocessor Directive Handling. |
| //===----------------------------------------------------------------------===// |
| |
| MacroInfo *Preprocessor::AllocateMacroInfo() { |
| MacroInfoChain *MIChain; |
| |
| if (MICache) { |
| MIChain = MICache; |
| MICache = MICache->Next; |
| } |
| else { |
| MIChain = BP.Allocate<MacroInfoChain>(); |
| } |
| |
| MIChain->Next = MIChainHead; |
| MIChain->Prev = 0; |
| if (MIChainHead) |
| MIChainHead->Prev = MIChain; |
| MIChainHead = MIChain; |
| |
| return &(MIChain->MI); |
| } |
| |
| MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) { |
| MacroInfo *MI = AllocateMacroInfo(); |
| new (MI) MacroInfo(L); |
| return MI; |
| } |
| |
| MacroInfo *Preprocessor::CloneMacroInfo(const MacroInfo &MacroToClone) { |
| MacroInfo *MI = AllocateMacroInfo(); |
| new (MI) MacroInfo(MacroToClone, BP); |
| return MI; |
| } |
| |
| /// ReleaseMacroInfo - Release the specified MacroInfo. This memory will |
| /// be reused for allocating new MacroInfo objects. |
| void Preprocessor::ReleaseMacroInfo(MacroInfo *MI) { |
| MacroInfoChain *MIChain = (MacroInfoChain*) MI; |
| if (MacroInfoChain *Prev = MIChain->Prev) { |
| MacroInfoChain *Next = MIChain->Next; |
| Prev->Next = Next; |
| if (Next) |
| Next->Prev = Prev; |
| } |
| else { |
| assert(MIChainHead == MIChain); |
| MIChainHead = MIChain->Next; |
| MIChainHead->Prev = 0; |
| } |
| MIChain->Next = MICache; |
| MICache = MIChain; |
| |
| MI->Destroy(); |
| } |
| |
| /// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the |
| /// current line until the tok::eod token is found. |
| void Preprocessor::DiscardUntilEndOfDirective() { |
| Token Tmp; |
| do { |
| LexUnexpandedToken(Tmp); |
| assert(Tmp.isNot(tok::eof) && "EOF seen while discarding directive tokens"); |
| } while (Tmp.isNot(tok::eod)); |
| } |
| |
| /// ReadMacroName - Lex and validate a macro name, which occurs after a |
| /// #define or #undef. This sets the token kind to eod and discards the rest |
| /// of the macro line if the macro name is invalid. isDefineUndef is 1 if |
| /// this is due to a a #define, 2 if #undef directive, 0 if it is something |
| /// else (e.g. #ifdef). |
| void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) { |
| // Read the token, don't allow macro expansion on it. |
| LexUnexpandedToken(MacroNameTok); |
| |
| if (MacroNameTok.is(tok::code_completion)) { |
| if (CodeComplete) |
| CodeComplete->CodeCompleteMacroName(isDefineUndef == 1); |
| LexUnexpandedToken(MacroNameTok); |
| return; |
| } |
| |
| // Missing macro name? |
| if (MacroNameTok.is(tok::eod)) { |
| Diag(MacroNameTok, diag::err_pp_missing_macro_name); |
| return; |
| } |
| |
| IdentifierInfo *II = MacroNameTok.getIdentifierInfo(); |
| if (II == 0) { |
| bool Invalid = false; |
| std::string Spelling = getSpelling(MacroNameTok, &Invalid); |
| if (Invalid) |
| return; |
| |
| const IdentifierInfo &Info = Identifiers.get(Spelling); |
| if (Info.isCPlusPlusOperatorKeyword()) |
| // C++ 2.5p2: Alternative tokens behave the same as its primary token |
| // except for their spellings. |
| Diag(MacroNameTok, diag::err_pp_operator_used_as_macro_name) << Spelling; |
| else |
| Diag(MacroNameTok, diag::err_pp_macro_not_identifier); |
| // Fall through on error. |
| } else if (isDefineUndef && II->getPPKeywordID() == tok::pp_defined) { |
| // Error if defining "defined": C99 6.10.8.4. |
| Diag(MacroNameTok, diag::err_defined_macro_name); |
| } else if (isDefineUndef && II->hasMacroDefinition() && |
| getMacroInfo(II)->isBuiltinMacro()) { |
| // Error if defining "__LINE__" and other builtins: C99 6.10.8.4. |
| if (isDefineUndef == 1) |
| Diag(MacroNameTok, diag::pp_redef_builtin_macro); |
| else |
| Diag(MacroNameTok, diag::pp_undef_builtin_macro); |
| } else { |
| // Okay, we got a good identifier node. Return it. |
| return; |
| } |
| |
| // Invalid macro name, read and discard the rest of the line. Then set the |
| // token kind to tok::eod. |
| MacroNameTok.setKind(tok::eod); |
| return DiscardUntilEndOfDirective(); |
| } |
| |
| /// CheckEndOfDirective - Ensure that the next token is a tok::eod token. If |
| /// not, emit a diagnostic and consume up until the eod. If EnableMacros is |
| /// true, then we consider macros that expand to zero tokens as being ok. |
| void Preprocessor::CheckEndOfDirective(const char *DirType, bool EnableMacros) { |
| Token Tmp; |
| // Lex unexpanded tokens for most directives: macros might expand to zero |
| // tokens, causing us to miss diagnosing invalid lines. Some directives (like |
| // #line) allow empty macros. |
| if (EnableMacros) |
| Lex(Tmp); |
| else |
| LexUnexpandedToken(Tmp); |
| |
| // There should be no tokens after the directive, but we allow them as an |
| // extension. |
| while (Tmp.is(tok::comment)) // Skip comments in -C mode. |
| LexUnexpandedToken(Tmp); |
| |
| if (Tmp.isNot(tok::eod)) { |
| // Add a fixit in GNU/C99/C++ mode. Don't offer a fixit for strict-C89, |
| // or if this is a macro-style preprocessing directive, because it is more |
| // trouble than it is worth to insert /**/ and check that there is no /**/ |
| // in the range also. |
| FixItHint Hint; |
| if ((Features.GNUMode || Features.C99 || Features.CPlusPlus) && |
| !CurTokenLexer) |
| Hint = FixItHint::CreateInsertion(Tmp.getLocation(),"//"); |
| Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType << Hint; |
| DiscardUntilEndOfDirective(); |
| } |
| } |
| |
| |
| |
| /// SkipExcludedConditionalBlock - We just read a #if or related directive and |
| /// decided that the subsequent tokens are in the #if'd out portion of the |
| /// file. Lex the rest of the file, until we see an #endif. If |
| /// FoundNonSkipPortion is true, then we have already emitted code for part of |
| /// this #if directive, so #else/#elif blocks should never be entered. If ElseOk |
| /// is true, then #else directives are ok, if not, then we have already seen one |
| /// so a #else directive is a duplicate. When this returns, the caller can lex |
| /// the first valid token. |
| void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc, |
| bool FoundNonSkipPortion, |
| bool FoundElse) { |
| ++NumSkipped; |
| assert(CurTokenLexer == 0 && CurPPLexer && "Lexing a macro, not a file?"); |
| |
| CurPPLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false, |
| FoundNonSkipPortion, FoundElse); |
| |
| if (CurPTHLexer) { |
| PTHSkipExcludedConditionalBlock(); |
| return; |
| } |
| |
| // Enter raw mode to disable identifier lookup (and thus macro expansion), |
| // disabling warnings, etc. |
| CurPPLexer->LexingRawMode = true; |
| Token Tok; |
| while (1) { |
| CurLexer->Lex(Tok); |
| |
| if (Tok.is(tok::code_completion)) { |
| if (CodeComplete) |
| CodeComplete->CodeCompleteInConditionalExclusion(); |
| continue; |
| } |
| |
| // If this is the end of the buffer, we have an error. |
| if (Tok.is(tok::eof)) { |
| // Emit errors for each unterminated conditional on the stack, including |
| // the current one. |
| while (!CurPPLexer->ConditionalStack.empty()) { |
| if (!isCodeCompletionFile(Tok.getLocation())) |
| Diag(CurPPLexer->ConditionalStack.back().IfLoc, |
| diag::err_pp_unterminated_conditional); |
| CurPPLexer->ConditionalStack.pop_back(); |
| } |
| |
| // Just return and let the caller lex after this #include. |
| break; |
| } |
| |
| // If this token is not a preprocessor directive, just skip it. |
| if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine()) |
| continue; |
| |
| // We just parsed a # character at the start of a line, so we're in |
| // directive mode. Tell the lexer this so any newlines we see will be |
| // converted into an EOD token (this terminates the macro). |
| CurPPLexer->ParsingPreprocessorDirective = true; |
| if (CurLexer) CurLexer->SetCommentRetentionState(false); |
| |
| |
| // Read the next token, the directive flavor. |
| LexUnexpandedToken(Tok); |
| |
| // If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or |
| // something bogus), skip it. |
| if (Tok.isNot(tok::raw_identifier)) { |
| CurPPLexer->ParsingPreprocessorDirective = false; |
| // Restore comment saving mode. |
| if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); |
| continue; |
| } |
| |
| // If the first letter isn't i or e, it isn't intesting to us. We know that |
| // this is safe in the face of spelling differences, because there is no way |
| // to spell an i/e in a strange way that is another letter. Skipping this |
| // allows us to avoid looking up the identifier info for #define/#undef and |
| // other common directives. |
| const char *RawCharData = Tok.getRawIdentifierData(); |
| |
| char FirstChar = RawCharData[0]; |
| if (FirstChar >= 'a' && FirstChar <= 'z' && |
| FirstChar != 'i' && FirstChar != 'e') { |
| CurPPLexer->ParsingPreprocessorDirective = false; |
| // Restore comment saving mode. |
| if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); |
| continue; |
| } |
| |
| // Get the identifier name without trigraphs or embedded newlines. Note |
| // that we can't use Tok.getIdentifierInfo() because its lookup is disabled |
| // when skipping. |
| char DirectiveBuf[20]; |
| StringRef Directive; |
| if (!Tok.needsCleaning() && Tok.getLength() < 20) { |
| Directive = StringRef(RawCharData, Tok.getLength()); |
| } else { |
| std::string DirectiveStr = getSpelling(Tok); |
| unsigned IdLen = DirectiveStr.size(); |
| if (IdLen >= 20) { |
| CurPPLexer->ParsingPreprocessorDirective = false; |
| // Restore comment saving mode. |
| if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); |
| continue; |
| } |
| memcpy(DirectiveBuf, &DirectiveStr[0], IdLen); |
| Directive = StringRef(DirectiveBuf, IdLen); |
| } |
| |
| if (Directive.startswith("if")) { |
| StringRef Sub = Directive.substr(2); |
| if (Sub.empty() || // "if" |
| Sub == "def" || // "ifdef" |
| Sub == "ndef") { // "ifndef" |
| // We know the entire #if/#ifdef/#ifndef block will be skipped, don't |
| // bother parsing the condition. |
| DiscardUntilEndOfDirective(); |
| CurPPLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true, |
| /*foundnonskip*/false, |
| /*foundelse*/false); |
| |
| if (Callbacks) |
| Callbacks->Endif(); |
| } |
| } else if (Directive[0] == 'e') { |
| StringRef Sub = Directive.substr(1); |
| if (Sub == "ndif") { // "endif" |
| CheckEndOfDirective("endif"); |
| PPConditionalInfo CondInfo; |
| CondInfo.WasSkipping = true; // Silence bogus warning. |
| bool InCond = CurPPLexer->popConditionalLevel(CondInfo); |
| (void)InCond; // Silence warning in no-asserts mode. |
| assert(!InCond && "Can't be skipping if not in a conditional!"); |
| |
| // If we popped the outermost skipping block, we're done skipping! |
| if (!CondInfo.WasSkipping) |
| break; |
| } else if (Sub == "lse") { // "else". |
| // #else directive in a skipping conditional. If not in some other |
| // skipping conditional, and if #else hasn't already been seen, enter it |
| // as a non-skipping conditional. |
| PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel(); |
| |
| // If this is a #else with a #else before it, report the error. |
| if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else); |
| |
| // Note that we've seen a #else in this conditional. |
| CondInfo.FoundElse = true; |
| |
| if (Callbacks) |
| Callbacks->Else(); |
| |
| // If the conditional is at the top level, and the #if block wasn't |
| // entered, enter the #else block now. |
| if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) { |
| CondInfo.FoundNonSkip = true; |
| CheckEndOfDirective("else"); |
| break; |
| } else { |
| DiscardUntilEndOfDirective(); // C99 6.10p4. |
| } |
| } else if (Sub == "lif") { // "elif". |
| PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel(); |
| |
| bool ShouldEnter; |
| const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation(); |
| // If this is in a skipping block or if we're already handled this #if |
| // block, don't bother parsing the condition. |
| if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) { |
| DiscardUntilEndOfDirective(); |
| ShouldEnter = false; |
| } else { |
| // Restore the value of LexingRawMode so that identifiers are |
| // looked up, etc, inside the #elif expression. |
| assert(CurPPLexer->LexingRawMode && "We have to be skipping here!"); |
| CurPPLexer->LexingRawMode = false; |
| IdentifierInfo *IfNDefMacro = 0; |
| ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro); |
| CurPPLexer->LexingRawMode = true; |
| } |
| const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation(); |
| |
| // If this is a #elif with a #else before it, report the error. |
| if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else); |
| |
| if (Callbacks) |
| Callbacks->Elif(SourceRange(ConditionalBegin, ConditionalEnd)); |
| |
| // If this condition is true, enter it! |
| if (ShouldEnter) { |
| CondInfo.FoundNonSkip = true; |
| break; |
| } |
| } |
| } |
| |
| CurPPLexer->ParsingPreprocessorDirective = false; |
| // Restore comment saving mode. |
| if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); |
| } |
| |
| // Finally, if we are out of the conditional (saw an #endif or ran off the end |
| // of the file, just stop skipping and return to lexing whatever came after |
| // the #if block. |
| CurPPLexer->LexingRawMode = false; |
| } |
| |
| void Preprocessor::PTHSkipExcludedConditionalBlock() { |
| |
| while (1) { |
| assert(CurPTHLexer); |
| assert(CurPTHLexer->LexingRawMode == false); |
| |
| // Skip to the next '#else', '#elif', or #endif. |
| if (CurPTHLexer->SkipBlock()) { |
| // We have reached an #endif. Both the '#' and 'endif' tokens |
| // have been consumed by the PTHLexer. Just pop off the condition level. |
| PPConditionalInfo CondInfo; |
| bool InCond = CurPTHLexer->popConditionalLevel(CondInfo); |
| (void)InCond; // Silence warning in no-asserts mode. |
| assert(!InCond && "Can't be skipping if not in a conditional!"); |
| break; |
| } |
| |
| // We have reached a '#else' or '#elif'. Lex the next token to get |
| // the directive flavor. |
| Token Tok; |
| LexUnexpandedToken(Tok); |
| |
| // We can actually look up the IdentifierInfo here since we aren't in |
| // raw mode. |
| tok::PPKeywordKind K = Tok.getIdentifierInfo()->getPPKeywordID(); |
| |
| if (K == tok::pp_else) { |
| // #else: Enter the else condition. We aren't in a nested condition |
| // since we skip those. We're always in the one matching the last |
| // blocked we skipped. |
| PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel(); |
| // Note that we've seen a #else in this conditional. |
| CondInfo.FoundElse = true; |
| |
| // If the #if block wasn't entered then enter the #else block now. |
| if (!CondInfo.FoundNonSkip) { |
| CondInfo.FoundNonSkip = true; |
| |
| // Scan until the eod token. |
| CurPTHLexer->ParsingPreprocessorDirective = true; |
| DiscardUntilEndOfDirective(); |
| CurPTHLexer->ParsingPreprocessorDirective = false; |
| |
| break; |
| } |
| |
| // Otherwise skip this block. |
| continue; |
| } |
| |
| assert(K == tok::pp_elif); |
| PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel(); |
| |
| // If this is a #elif with a #else before it, report the error. |
| if (CondInfo.FoundElse) |
| Diag(Tok, diag::pp_err_elif_after_else); |
| |
| // If this is in a skipping block or if we're already handled this #if |
| // block, don't bother parsing the condition. We just skip this block. |
| if (CondInfo.FoundNonSkip) |
| continue; |
| |
| // Evaluate the condition of the #elif. |
| IdentifierInfo *IfNDefMacro = 0; |
| CurPTHLexer->ParsingPreprocessorDirective = true; |
| bool ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro); |
| CurPTHLexer->ParsingPreprocessorDirective = false; |
| |
| // If this condition is true, enter it! |
| if (ShouldEnter) { |
| CondInfo.FoundNonSkip = true; |
| break; |
| } |
| |
| // Otherwise, skip this block and go to the next one. |
| continue; |
| } |
| } |
| |
| /// LookupFile - Given a "foo" or <foo> reference, look up the indicated file, |
| /// return null on failure. isAngled indicates whether the file reference is |
| /// for system #include's or not (i.e. using <> instead of ""). |
| const FileEntry *Preprocessor::LookupFile( |
| StringRef Filename, |
| bool isAngled, |
| const DirectoryLookup *FromDir, |
| const DirectoryLookup *&CurDir, |
| SmallVectorImpl<char> *SearchPath, |
| SmallVectorImpl<char> *RelativePath) { |
| // If the header lookup mechanism may be relative to the current file, pass in |
| // info about where the current file is. |
| const FileEntry *CurFileEnt = 0; |
| if (!FromDir) { |
| FileID FID = getCurrentFileLexer()->getFileID(); |
| CurFileEnt = SourceMgr.getFileEntryForID(FID); |
| |
| // If there is no file entry associated with this file, it must be the |
| // predefines buffer. Any other file is not lexed with a normal lexer, so |
| // it won't be scanned for preprocessor directives. If we have the |
| // predefines buffer, resolve #include references (which come from the |
| // -include command line argument) as if they came from the main file, this |
| // affects file lookup etc. |
| if (CurFileEnt == 0) { |
| FID = SourceMgr.getMainFileID(); |
| CurFileEnt = SourceMgr.getFileEntryForID(FID); |
| } |
| } |
| |
| // Do a standard file entry lookup. |
| CurDir = CurDirLookup; |
| const FileEntry *FE = HeaderInfo.LookupFile( |
| Filename, isAngled, FromDir, CurDir, CurFileEnt, |
| SearchPath, RelativePath); |
| if (FE) return FE; |
| |
| // Otherwise, see if this is a subframework header. If so, this is relative |
| // to one of the headers on the #include stack. Walk the list of the current |
| // headers on the #include stack and pass them to HeaderInfo. |
| if (IsFileLexer()) { |
| if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID()))) |
| if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt, |
| SearchPath, RelativePath))) |
| return FE; |
| } |
| |
| for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) { |
| IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1]; |
| if (IsFileLexer(ISEntry)) { |
| if ((CurFileEnt = |
| SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID()))) |
| if ((FE = HeaderInfo.LookupSubframeworkHeader( |
| Filename, CurFileEnt, SearchPath, RelativePath))) |
| return FE; |
| } |
| } |
| |
| // Otherwise, we really couldn't find the file. |
| return 0; |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // Preprocessor Directive Handling. |
| //===----------------------------------------------------------------------===// |
| |
| /// HandleDirective - This callback is invoked when the lexer sees a # token |
| /// at the start of a line. This consumes the directive, modifies the |
| /// lexer/preprocessor state, and advances the lexer(s) so that the next token |
| /// read is the correct one. |
| void Preprocessor::HandleDirective(Token &Result) { |
| // FIXME: Traditional: # with whitespace before it not recognized by K&R? |
| |
| // We just parsed a # character at the start of a line, so we're in directive |
| // mode. Tell the lexer this so any newlines we see will be converted into an |
| // EOD token (which terminates the directive). |
| CurPPLexer->ParsingPreprocessorDirective = true; |
| |
| ++NumDirectives; |
| |
| // We are about to read a token. For the multiple-include optimization FA to |
| // work, we have to remember if we had read any tokens *before* this |
| // pp-directive. |
| bool ReadAnyTokensBeforeDirective =CurPPLexer->MIOpt.getHasReadAnyTokensVal(); |
| |
| // Save the '#' token in case we need to return it later. |
| Token SavedHash = Result; |
| |
| // Read the next token, the directive flavor. This isn't expanded due to |
| // C99 6.10.3p8. |
| LexUnexpandedToken(Result); |
| |
| // C99 6.10.3p11: Is this preprocessor directive in macro invocation? e.g.: |
| // #define A(x) #x |
| // A(abc |
| // #warning blah |
| // def) |
| // If so, the user is relying on non-portable behavior, emit a diagnostic. |
| if (InMacroArgs) |
| Diag(Result, diag::ext_embedded_directive); |
| |
| TryAgain: |
| switch (Result.getKind()) { |
| case tok::eod: |
| return; // null directive. |
| case tok::comment: |
| // Handle stuff like "# /*foo*/ define X" in -E -C mode. |
| LexUnexpandedToken(Result); |
| goto TryAgain; |
| case tok::code_completion: |
| if (CodeComplete) |
| CodeComplete->CodeCompleteDirective( |
| CurPPLexer->getConditionalStackDepth() > 0); |
| return; |
| case tok::numeric_constant: // # 7 GNU line marker directive. |
| if (getLangOptions().AsmPreprocessor) |
| break; // # 4 is not a preprocessor directive in .S files. |
| return HandleDigitDirective(Result); |
| default: |
| IdentifierInfo *II = Result.getIdentifierInfo(); |
| if (II == 0) break; // Not an identifier. |
| |
| // Ask what the preprocessor keyword ID is. |
| switch (II->getPPKeywordID()) { |
| default: break; |
| // C99 6.10.1 - Conditional Inclusion. |
| case tok::pp_if: |
| return HandleIfDirective(Result, ReadAnyTokensBeforeDirective); |
| case tok::pp_ifdef: |
| return HandleIfdefDirective(Result, false, true/*not valid for miopt*/); |
| case tok::pp_ifndef: |
| return HandleIfdefDirective(Result, true, ReadAnyTokensBeforeDirective); |
| case tok::pp_elif: |
| return HandleElifDirective(Result); |
| case tok::pp_else: |
| return HandleElseDirective(Result); |
| case tok::pp_endif: |
| return HandleEndifDirective(Result); |
| |
| // C99 6.10.2 - Source File Inclusion. |
| case tok::pp_include: |
| // Handle #include. |
| return HandleIncludeDirective(SavedHash.getLocation(), Result); |
| case tok::pp___include_macros: |
| // Handle -imacros. |
| return HandleIncludeMacrosDirective(SavedHash.getLocation(), Result); |
| |
| // C99 6.10.3 - Macro Replacement. |
| case tok::pp_define: |
| return HandleDefineDirective(Result); |
| case tok::pp_undef: |
| return HandleUndefDirective(Result); |
| |
| // C99 6.10.4 - Line Control. |
| case tok::pp_line: |
| return HandleLineDirective(Result); |
| |
| // C99 6.10.5 - Error Directive. |
| case tok::pp_error: |
| return HandleUserDiagnosticDirective(Result, false); |
| |
| // C99 6.10.6 - Pragma Directive. |
| case tok::pp_pragma: |
| return HandlePragmaDirective(PIK_HashPragma); |
| |
| // GNU Extensions. |
| case tok::pp_import: |
| return HandleImportDirective(SavedHash.getLocation(), Result); |
| case tok::pp_include_next: |
| return HandleIncludeNextDirective(SavedHash.getLocation(), Result); |
| |
| case tok::pp_warning: |
| Diag(Result, diag::ext_pp_warning_directive); |
| return HandleUserDiagnosticDirective(Result, true); |
| case tok::pp_ident: |
| return HandleIdentSCCSDirective(Result); |
| case tok::pp_sccs: |
| return HandleIdentSCCSDirective(Result); |
| case tok::pp_assert: |
| //isExtension = true; // FIXME: implement #assert |
| break; |
| case tok::pp_unassert: |
| //isExtension = true; // FIXME: implement #unassert |
| break; |
| } |
| break; |
| } |
| |
| // If this is a .S file, treat unknown # directives as non-preprocessor |
| // directives. This is important because # may be a comment or introduce |
| // various pseudo-ops. Just return the # token and push back the following |
| // token to be lexed next time. |
| if (getLangOptions().AsmPreprocessor) { |
| Token *Toks = new Token[2]; |
| // Return the # and the token after it. |
| Toks[0] = SavedHash; |
| Toks[1] = Result; |
| |
| // If the second token is a hashhash token, then we need to translate it to |
| // unknown so the token lexer doesn't try to perform token pasting. |
| if (Result.is(tok::hashhash)) |
| Toks[1].setKind(tok::unknown); |
| |
| // Enter this token stream so that we re-lex the tokens. Make sure to |
| // enable macro expansion, in case the token after the # is an identifier |
| // that is expanded. |
| EnterTokenStream(Toks, 2, false, true); |
| return; |
| } |
| |
| // If we reached here, the preprocessing token is not valid! |
| Diag(Result, diag::err_pp_invalid_directive); |
| |
| // Read the rest of the PP line. |
| DiscardUntilEndOfDirective(); |
| |
| // Okay, we're done parsing the directive. |
| } |
| |
| /// GetLineValue - Convert a numeric token into an unsigned value, emitting |
| /// Diagnostic DiagID if it is invalid, and returning the value in Val. |
| static bool GetLineValue(Token &DigitTok, unsigned &Val, |
| unsigned DiagID, Preprocessor &PP) { |
| if (DigitTok.isNot(tok::numeric_constant)) { |
| PP.Diag(DigitTok, DiagID); |
| |
| if (DigitTok.isNot(tok::eod)) |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| |
| llvm::SmallString<64> IntegerBuffer; |
| IntegerBuffer.resize(DigitTok.getLength()); |
| const char *DigitTokBegin = &IntegerBuffer[0]; |
| bool Invalid = false; |
| unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin, &Invalid); |
| if (Invalid) |
| return true; |
| |
| // Verify that we have a simple digit-sequence, and compute the value. This |
| // is always a simple digit string computed in decimal, so we do this manually |
| // here. |
| Val = 0; |
| for (unsigned i = 0; i != ActualLength; ++i) { |
| if (!isdigit(DigitTokBegin[i])) { |
| PP.Diag(PP.AdvanceToTokenCharacter(DigitTok.getLocation(), i), |
| diag::err_pp_line_digit_sequence); |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| |
| unsigned NextVal = Val*10+(DigitTokBegin[i]-'0'); |
| if (NextVal < Val) { // overflow. |
| PP.Diag(DigitTok, DiagID); |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| Val = NextVal; |
| } |
| |
| // Reject 0, this is needed both by #line numbers and flags. |
| if (Val == 0) { |
| PP.Diag(DigitTok, DiagID); |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| |
| if (DigitTokBegin[0] == '0') |
| PP.Diag(DigitTok.getLocation(), diag::warn_pp_line_decimal); |
| |
| return false; |
| } |
| |
| /// HandleLineDirective - Handle #line directive: C99 6.10.4. The two |
| /// acceptable forms are: |
| /// # line digit-sequence |
| /// # line digit-sequence "s-char-sequence" |
| void Preprocessor::HandleLineDirective(Token &Tok) { |
| // Read the line # and string argument. Per C99 6.10.4p5, these tokens are |
| // expanded. |
| Token DigitTok; |
| Lex(DigitTok); |
| |
| // Validate the number and convert it to an unsigned. |
| unsigned LineNo; |
| if (GetLineValue(DigitTok, LineNo, diag::err_pp_line_requires_integer,*this)) |
| return; |
| |
| // Enforce C99 6.10.4p3: "The digit sequence shall not specify ... a |
| // number greater than 2147483647". C90 requires that the line # be <= 32767. |
| unsigned LineLimit = Features.C99 ? 2147483648U : 32768U; |
| if (LineNo >= LineLimit) |
| Diag(DigitTok, diag::ext_pp_line_too_big) << LineLimit; |
| |
| int FilenameID = -1; |
| Token StrTok; |
| Lex(StrTok); |
| |
| // If the StrTok is "eod", then it wasn't present. Otherwise, it must be a |
| // string followed by eod. |
| if (StrTok.is(tok::eod)) |
| ; // ok |
| else if (StrTok.isNot(tok::string_literal)) { |
| Diag(StrTok, diag::err_pp_line_invalid_filename); |
| DiscardUntilEndOfDirective(); |
| return; |
| } else { |
| // Parse and validate the string, converting it into a unique ID. |
| StringLiteralParser Literal(&StrTok, 1, *this); |
| assert(!Literal.AnyWide && "Didn't allow wide strings in"); |
| if (Literal.hadError) |
| return DiscardUntilEndOfDirective(); |
| if (Literal.Pascal) { |
| Diag(StrTok, diag::err_pp_linemarker_invalid_filename); |
| return DiscardUntilEndOfDirective(); |
| } |
| FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString()); |
| |
| // Verify that there is nothing after the string, other than EOD. Because |
| // of C99 6.10.4p5, macros that expand to empty tokens are ok. |
| CheckEndOfDirective("line", true); |
| } |
| |
| SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID); |
| |
| if (Callbacks) |
| Callbacks->FileChanged(CurPPLexer->getSourceLocation(), |
| PPCallbacks::RenameFile, |
| SrcMgr::C_User); |
| } |
| |
| /// ReadLineMarkerFlags - Parse and validate any flags at the end of a GNU line |
| /// marker directive. |
| static bool ReadLineMarkerFlags(bool &IsFileEntry, bool &IsFileExit, |
| bool &IsSystemHeader, bool &IsExternCHeader, |
| Preprocessor &PP) { |
| unsigned FlagVal; |
| Token FlagTok; |
| PP.Lex(FlagTok); |
| if (FlagTok.is(tok::eod)) return false; |
| if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP)) |
| return true; |
| |
| if (FlagVal == 1) { |
| IsFileEntry = true; |
| |
| PP.Lex(FlagTok); |
| if (FlagTok.is(tok::eod)) return false; |
| if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP)) |
| return true; |
| } else if (FlagVal == 2) { |
| IsFileExit = true; |
| |
| SourceManager &SM = PP.getSourceManager(); |
| // If we are leaving the current presumed file, check to make sure the |
| // presumed include stack isn't empty! |
| FileID CurFileID = |
| SM.getDecomposedExpansionLoc(FlagTok.getLocation()).first; |
| PresumedLoc PLoc = SM.getPresumedLoc(FlagTok.getLocation()); |
| if (PLoc.isInvalid()) |
| return true; |
| |
| // If there is no include loc (main file) or if the include loc is in a |
| // different physical file, then we aren't in a "1" line marker flag region. |
| SourceLocation IncLoc = PLoc.getIncludeLoc(); |
| if (IncLoc.isInvalid() || |
| SM.getDecomposedExpansionLoc(IncLoc).first != CurFileID) { |
| PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_pop); |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| |
| PP.Lex(FlagTok); |
| if (FlagTok.is(tok::eod)) return false; |
| if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP)) |
| return true; |
| } |
| |
| // We must have 3 if there are still flags. |
| if (FlagVal != 3) { |
| PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| |
| IsSystemHeader = true; |
| |
| PP.Lex(FlagTok); |
| if (FlagTok.is(tok::eod)) return false; |
| if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP)) |
| return true; |
| |
| // We must have 4 if there is yet another flag. |
| if (FlagVal != 4) { |
| PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| |
| IsExternCHeader = true; |
| |
| PP.Lex(FlagTok); |
| if (FlagTok.is(tok::eod)) return false; |
| |
| // There are no more valid flags here. |
| PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag); |
| PP.DiscardUntilEndOfDirective(); |
| return true; |
| } |
| |
| /// HandleDigitDirective - Handle a GNU line marker directive, whose syntax is |
| /// one of the following forms: |
| /// |
| /// # 42 |
| /// # 42 "file" ('1' | '2')? |
| /// # 42 "file" ('1' | '2')? '3' '4'? |
| /// |
| void Preprocessor::HandleDigitDirective(Token &DigitTok) { |
| // Validate the number and convert it to an unsigned. GNU does not have a |
| // line # limit other than it fit in 32-bits. |
| unsigned LineNo; |
| if (GetLineValue(DigitTok, LineNo, diag::err_pp_linemarker_requires_integer, |
| *this)) |
| return; |
| |
| Token StrTok; |
| Lex(StrTok); |
| |
| bool IsFileEntry = false, IsFileExit = false; |
| bool IsSystemHeader = false, IsExternCHeader = false; |
| int FilenameID = -1; |
| |
| // If the StrTok is "eod", then it wasn't present. Otherwise, it must be a |
| // string followed by eod. |
| if (StrTok.is(tok::eod)) |
| ; // ok |
| else if (StrTok.isNot(tok::string_literal)) { |
| Diag(StrTok, diag::err_pp_linemarker_invalid_filename); |
| return DiscardUntilEndOfDirective(); |
| } else { |
| // Parse and validate the string, converting it into a unique ID. |
| StringLiteralParser Literal(&StrTok, 1, *this); |
| assert(!Literal.AnyWide && "Didn't allow wide strings in"); |
| if (Literal.hadError) |
| return DiscardUntilEndOfDirective(); |
| if (Literal.Pascal) { |
| Diag(StrTok, diag::err_pp_linemarker_invalid_filename); |
| return DiscardUntilEndOfDirective(); |
| } |
| FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString()); |
| |
| // If a filename was present, read any flags that are present. |
| if (ReadLineMarkerFlags(IsFileEntry, IsFileExit, |
| IsSystemHeader, IsExternCHeader, *this)) |
| return; |
| } |
| |
| // Create a line note with this information. |
| SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID, |
| IsFileEntry, IsFileExit, |
| IsSystemHeader, IsExternCHeader); |
| |
| // If the preprocessor has callbacks installed, notify them of the #line |
| // change. This is used so that the line marker comes out in -E mode for |
| // example. |
| if (Callbacks) { |
| PPCallbacks::FileChangeReason Reason = PPCallbacks::RenameFile; |
| if (IsFileEntry) |
| Reason = PPCallbacks::EnterFile; |
| else if (IsFileExit) |
| Reason = PPCallbacks::ExitFile; |
| SrcMgr::CharacteristicKind FileKind = SrcMgr::C_User; |
| if (IsExternCHeader) |
| FileKind = SrcMgr::C_ExternCSystem; |
| else if (IsSystemHeader) |
| FileKind = SrcMgr::C_System; |
| |
| Callbacks->FileChanged(CurPPLexer->getSourceLocation(), Reason, FileKind); |
| } |
| } |
| |
| |
| /// HandleUserDiagnosticDirective - Handle a #warning or #error directive. |
| /// |
| void Preprocessor::HandleUserDiagnosticDirective(Token &Tok, |
| bool isWarning) { |
| // PTH doesn't emit #warning or #error directives. |
| if (CurPTHLexer) |
| return CurPTHLexer->DiscardToEndOfLine(); |
| |
| // Read the rest of the line raw. We do this because we don't want macros |
| // to be expanded and we don't require that the tokens be valid preprocessing |
| // tokens. For example, this is allowed: "#warning ` 'foo". GCC does |
| // collapse multiple consequtive white space between tokens, but this isn't |
| // specified by the standard. |
| std::string Message = CurLexer->ReadToEndOfLine(); |
| if (isWarning) |
| Diag(Tok, diag::pp_hash_warning) << Message; |
| else |
| Diag(Tok, diag::err_pp_hash_error) << Message; |
| } |
| |
| /// HandleIdentSCCSDirective - Handle a #ident/#sccs directive. |
| /// |
| void Preprocessor::HandleIdentSCCSDirective(Token &Tok) { |
| // Yes, this directive is an extension. |
| Diag(Tok, diag::ext_pp_ident_directive); |
| |
| // Read the string argument. |
| Token StrTok; |
| Lex(StrTok); |
| |
| // If the token kind isn't a string, it's a malformed directive. |
| if (StrTok.isNot(tok::string_literal) && |
| StrTok.isNot(tok::wide_string_literal)) { |
| Diag(StrTok, diag::err_pp_malformed_ident); |
| if (StrTok.isNot(tok::eod)) |
| DiscardUntilEndOfDirective(); |
| return; |
| } |
| |
| // Verify that there is nothing after the string, other than EOD. |
| CheckEndOfDirective("ident"); |
| |
| if (Callbacks) { |
| bool Invalid = false; |
| std::string Str = getSpelling(StrTok, &Invalid); |
| if (!Invalid) |
| Callbacks->Ident(Tok.getLocation(), Str); |
| } |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Preprocessor Include Directive Handling. |
| //===----------------------------------------------------------------------===// |
| |
| /// GetIncludeFilenameSpelling - Turn the specified lexer token into a fully |
| /// checked and spelled filename, e.g. as an operand of #include. This returns |
| /// true if the input filename was in <>'s or false if it were in ""'s. The |
| /// caller is expected to provide a buffer that is large enough to hold the |
| /// spelling of the filename, but is also expected to handle the case when |
| /// this method decides to use a different buffer. |
| bool Preprocessor::GetIncludeFilenameSpelling(SourceLocation Loc, |
| StringRef &Buffer) { |
| // Get the text form of the filename. |
| assert(!Buffer.empty() && "Can't have tokens with empty spellings!"); |
| |
| // Make sure the filename is <x> or "x". |
| bool isAngled; |
| if (Buffer[0] == '<') { |
| if (Buffer.back() != '>') { |
| Diag(Loc, diag::err_pp_expects_filename); |
| Buffer = StringRef(); |
| return true; |
| } |
| isAngled = true; |
| } else if (Buffer[0] == '"') { |
| if (Buffer.back() != '"') { |
| Diag(Loc, diag::err_pp_expects_filename); |
| Buffer = StringRef(); |
| return true; |
| } |
| isAngled = false; |
| } else { |
| Diag(Loc, diag::err_pp_expects_filename); |
| Buffer = StringRef(); |
| return true; |
| } |
| |
| // Diagnose #include "" as invalid. |
| if (Buffer.size() <= 2) { |
| Diag(Loc, diag::err_pp_empty_filename); |
| Buffer = StringRef(); |
| return true; |
| } |
| |
| // Skip the brackets. |
| Buffer = Buffer.substr(1, Buffer.size()-2); |
| return isAngled; |
| } |
| |
| /// ConcatenateIncludeName - Handle cases where the #include name is expanded |
| /// from a macro as multiple tokens, which need to be glued together. This |
| /// occurs for code like: |
| /// #define FOO <a/b.h> |
| /// #include FOO |
| /// because in this case, "<a/b.h>" is returned as 7 tokens, not one. |
| /// |
| /// This code concatenates and consumes tokens up to the '>' token. It returns |
| /// false if the > was found, otherwise it returns true if it finds and consumes |
| /// the EOD marker. |
| bool Preprocessor::ConcatenateIncludeName( |
| llvm::SmallString<128> &FilenameBuffer, |
| SourceLocation &End) { |
| Token CurTok; |
| |
| Lex(CurTok); |
| while (CurTok.isNot(tok::eod)) { |
| End = CurTok.getLocation(); |
| |
| // FIXME: Provide code completion for #includes. |
| if (CurTok.is(tok::code_completion)) { |
| Lex(CurTok); |
| continue; |
| } |
| |
| // Append the spelling of this token to the buffer. If there was a space |
| // before it, add it now. |
| if (CurTok.hasLeadingSpace()) |
| FilenameBuffer.push_back(' '); |
| |
| // Get the spelling of the token, directly into FilenameBuffer if possible. |
| unsigned PreAppendSize = FilenameBuffer.size(); |
| FilenameBuffer.resize(PreAppendSize+CurTok.getLength()); |
| |
| const char *BufPtr = &FilenameBuffer[PreAppendSize]; |
| unsigned ActualLen = getSpelling(CurTok, BufPtr); |
| |
| // If the token was spelled somewhere else, copy it into FilenameBuffer. |
| if (BufPtr != &FilenameBuffer[PreAppendSize]) |
| memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen); |
| |
| // Resize FilenameBuffer to the correct size. |
| if (CurTok.getLength() != ActualLen) |
| FilenameBuffer.resize(PreAppendSize+ActualLen); |
| |
| // If we found the '>' marker, return success. |
| if (CurTok.is(tok::greater)) |
| return false; |
| |
| Lex(CurTok); |
| } |
| |
| // If we hit the eod marker, emit an error and return true so that the caller |
| // knows the EOD has been read. |
| Diag(CurTok.getLocation(), diag::err_pp_expects_filename); |
| return true; |
| } |
| |
| /// HandleIncludeDirective - The "#include" tokens have just been read, read the |
| /// file to be included from the lexer, then include it! This is a common |
| /// routine with functionality shared between #include, #include_next and |
| /// #import. LookupFrom is set when this is a #include_next directive, it |
| /// specifies the file to start searching from. |
| void Preprocessor::HandleIncludeDirective(SourceLocation HashLoc, |
| Token &IncludeTok, |
| const DirectoryLookup *LookupFrom, |
| bool isImport) { |
| |
| Token FilenameTok; |
| CurPPLexer->LexIncludeFilename(FilenameTok); |
| |
| // Reserve a buffer to get the spelling. |
| llvm::SmallString<128> FilenameBuffer; |
| StringRef Filename; |
| SourceLocation End; |
| |
| switch (FilenameTok.getKind()) { |
| case tok::eod: |
| // If the token kind is EOD, the error has already been diagnosed. |
| return; |
| |
| case tok::angle_string_literal: |
| case tok::string_literal: |
| Filename = getSpelling(FilenameTok, FilenameBuffer); |
| End = FilenameTok.getLocation(); |
| break; |
| |
| case tok::less: |
| // This could be a <foo/bar.h> file coming from a macro expansion. In this |
| // case, glue the tokens together into FilenameBuffer and interpret those. |
| FilenameBuffer.push_back('<'); |
| if (ConcatenateIncludeName(FilenameBuffer, End)) |
| return; // Found <eod> but no ">"? Diagnostic already emitted. |
| Filename = FilenameBuffer.str(); |
| break; |
| default: |
| Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename); |
| DiscardUntilEndOfDirective(); |
| return; |
| } |
| |
| bool isAngled = |
| GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename); |
| // If GetIncludeFilenameSpelling set the start ptr to null, there was an |
| // error. |
| if (Filename.empty()) { |
| DiscardUntilEndOfDirective(); |
| return; |
| } |
| |
| // Verify that there is nothing after the filename, other than EOD. Note that |
| // we allow macros that expand to nothing after the filename, because this |
| // falls into the category of "#include pp-tokens new-line" specified in |
| // C99 6.10.2p4. |
| CheckEndOfDirective(IncludeTok.getIdentifierInfo()->getNameStart(), true); |
| |
| // Check that we don't have infinite #include recursion. |
| if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1) { |
| Diag(FilenameTok, diag::err_pp_include_too_deep); |
| return; |
| } |
| |
| // Search include directories. |
| const DirectoryLookup *CurDir; |
| llvm::SmallString<1024> SearchPath; |
| llvm::SmallString<1024> RelativePath; |
| // We get the raw path only if we have 'Callbacks' to which we later pass |
| // the path. |
| const FileEntry *File = LookupFile( |
| Filename, isAngled, LookupFrom, CurDir, |
| Callbacks ? &SearchPath : NULL, Callbacks ? &RelativePath : NULL); |
| |
| // Notify the callback object that we've seen an inclusion directive. |
| if (Callbacks) |
| Callbacks->InclusionDirective(HashLoc, IncludeTok, Filename, isAngled, File, |
| End, SearchPath, RelativePath); |
| |
| if (File == 0) { |
| Diag(FilenameTok, diag::warn_pp_file_not_found) << Filename; |
| return; |
| } |
| |
| // The #included file will be considered to be a system header if either it is |
| // in a system include directory, or if the #includer is a system include |
| // header. |
| SrcMgr::CharacteristicKind FileCharacter = |
| std::max(HeaderInfo.getFileDirFlavor(File), |
| SourceMgr.getFileCharacteristic(FilenameTok.getLocation())); |
| |
| // Ask HeaderInfo if we should enter this #include file. If not, #including |
| // this file will have no effect. |
| if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) { |
| if (Callbacks) |
| Callbacks->FileSkipped(*File, FilenameTok, FileCharacter); |
| return; |
| } |
| |
| // Look up the file, create a File ID for it. |
| FileID FID = SourceMgr.createFileID(File, FilenameTok.getLocation(), |
| FileCharacter); |
| assert(!FID.isInvalid() && "Expected valid file ID"); |
| |
| // Finally, if all is good, enter the new file! |
| EnterSourceFile(FID, CurDir, FilenameTok.getLocation()); |
| } |
| |
| /// HandleIncludeNextDirective - Implements #include_next. |
| /// |
| void Preprocessor::HandleIncludeNextDirective(SourceLocation HashLoc, |
| Token &IncludeNextTok) { |
| Diag(IncludeNextTok, diag::ext_pp_include_next_directive); |
| |
| // #include_next is like #include, except that we start searching after |
| // the current found directory. If we can't do this, issue a |
| // diagnostic. |
| const DirectoryLookup *Lookup = CurDirLookup; |
| if (isInPrimaryFile()) { |
| Lookup = 0; |
| Diag(IncludeNextTok, diag::pp_include_next_in_primary); |
| } else if (Lookup == 0) { |
| Diag(IncludeNextTok, diag::pp_include_next_absolute_path); |
| } else { |
| // Start looking up in the next directory. |
| ++Lookup; |
| } |
| |
| return HandleIncludeDirective(HashLoc, IncludeNextTok, Lookup); |
| } |
| |
| /// HandleImportDirective - Implements #import. |
| /// |
| void Preprocessor::HandleImportDirective(SourceLocation HashLoc, |
| Token &ImportTok) { |
| if (!Features.ObjC1) // #import is standard for ObjC. |
| Diag(ImportTok, diag::ext_pp_import_directive); |
| |
| return HandleIncludeDirective(HashLoc, ImportTok, 0, true); |
| } |
| |
| /// HandleIncludeMacrosDirective - The -imacros command line option turns into a |
| /// pseudo directive in the predefines buffer. This handles it by sucking all |
| /// tokens through the preprocessor and discarding them (only keeping the side |
| /// effects on the preprocessor). |
| void Preprocessor::HandleIncludeMacrosDirective(SourceLocation HashLoc, |
| Token &IncludeMacrosTok) { |
| // This directive should only occur in the predefines buffer. If not, emit an |
| // error and reject it. |
| SourceLocation Loc = IncludeMacrosTok.getLocation(); |
| if (strcmp(SourceMgr.getBufferName(Loc), "<built-in>") != 0) { |
| Diag(IncludeMacrosTok.getLocation(), |
| diag::pp_include_macros_out_of_predefines); |
| DiscardUntilEndOfDirective(); |
| return; |
| } |
| |
| // Treat this as a normal #include for checking purposes. If this is |
| // successful, it will push a new lexer onto the include stack. |
| HandleIncludeDirective(HashLoc, IncludeMacrosTok, 0, false); |
| |
| Token TmpTok; |
| do { |
| Lex(TmpTok); |
| assert(TmpTok.isNot(tok::eof) && "Didn't find end of -imacros!"); |
| } while (TmpTok.isNot(tok::hashhash)); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Preprocessor Macro Directive Handling. |
| //===----------------------------------------------------------------------===// |
| |
| /// ReadMacroDefinitionArgList - The ( starting an argument list of a macro |
| /// definition has just been read. Lex the rest of the arguments and the |
| /// closing ), updating MI with what we learn. Return true if an error occurs |
| /// parsing the arg list. |
| bool Preprocessor::ReadMacroDefinitionArgList(MacroInfo *MI) { |
| SmallVector<IdentifierInfo*, 32> Arguments; |
| |
| Token Tok; |
| while (1) { |
| LexUnexpandedToken(Tok); |
| switch (Tok.getKind()) { |
| case tok::r_paren: |
| // Found the end of the argument list. |
| if (Arguments.empty()) // #define FOO() |
| return false; |
| // Otherwise we have #define FOO(A,) |
| Diag(Tok, diag::err_pp_expected_ident_in_arg_list); |
| return true; |
| case tok::ellipsis: // #define X(... -> C99 varargs |
| // Warn if use of C99 feature in non-C99 mode. |
| if (!Features.C99) Diag(Tok, diag::ext_variadic_macro); |
| |
| // Lex the token after the identifier. |
| LexUnexpandedToken(Tok); |
| if (Tok.isNot(tok::r_paren)) { |
| Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); |
| return true; |
| } |
| // Add the __VA_ARGS__ identifier as an argument. |
| Arguments.push_back(Ident__VA_ARGS__); |
| MI->setIsC99Varargs(); |
| MI->setArgumentList(&Arguments[0], Arguments.size(), BP); |
| return false; |
| case tok::eod: // #define X( |
| Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); |
| return true; |
| default: |
| // Handle keywords and identifiers here to accept things like |
| // #define Foo(for) for. |
| IdentifierInfo *II = Tok.getIdentifierInfo(); |
| if (II == 0) { |
| // #define X(1 |
| Diag(Tok, diag::err_pp_invalid_tok_in_arg_list); |
| return true; |
| } |
| |
| // If this is already used as an argument, it is used multiple times (e.g. |
| // #define X(A,A. |
| if (std::find(Arguments.begin(), Arguments.end(), II) != |
| Arguments.end()) { // C99 6.10.3p6 |
| Diag(Tok, diag::err_pp_duplicate_name_in_arg_list) << II; |
| return true; |
| } |
| |
| // Add the argument to the macro info. |
| Arguments.push_back(II); |
| |
| // Lex the token after the identifier. |
| LexUnexpandedToken(Tok); |
| |
| switch (Tok.getKind()) { |
| default: // #define X(A B |
| Diag(Tok, diag::err_pp_expected_comma_in_arg_list); |
| return true; |
| case tok::r_paren: // #define X(A) |
| MI->setArgumentList(&Arguments[0], Arguments.size(), BP); |
| return false; |
| case tok::comma: // #define X(A, |
| break; |
| case tok::ellipsis: // #define X(A... -> GCC extension |
| // Diagnose extension. |
| Diag(Tok, diag::ext_named_variadic_macro); |
| |
| // Lex the token after the identifier. |
| LexUnexpandedToken(Tok); |
| if (Tok.isNot(tok::r_paren)) { |
| Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); |
| return true; |
| } |
| |
| MI->setIsGNUVarargs(); |
| MI->setArgumentList(&Arguments[0], Arguments.size(), BP); |
| return false; |
| } |
| } |
| } |
| } |
| |
| /// HandleDefineDirective - Implements #define. This consumes the entire macro |
| /// line then lets the caller lex the next real token. |
| void Preprocessor::HandleDefineDirective(Token &DefineTok) { |
| ++NumDefined; |
| |
| Token MacroNameTok; |
| ReadMacroName(MacroNameTok, 1); |
| |
| // Error reading macro name? If so, diagnostic already issued. |
| if (MacroNameTok.is(tok::eod)) |
| return; |
| |
| Token LastTok = MacroNameTok; |
| |
| // If we are supposed to keep comments in #defines, reenable comment saving |
| // mode. |
| if (CurLexer) CurLexer->SetCommentRetentionState(KeepMacroComments); |
| |
| // Create the new macro. |
| MacroInfo *MI = AllocateMacroInfo(MacroNameTok.getLocation()); |
| |
| Token Tok; |
| LexUnexpandedToken(Tok); |
| |
| // If this is a function-like macro definition, parse the argument list, |
| // marking each of the identifiers as being used as macro arguments. Also, |
| // check other constraints on the first token of the macro body. |
| if (Tok.is(tok::eod)) { |
| // If there is no body to this macro, we have no special handling here. |
| } else if (Tok.hasLeadingSpace()) { |
| // This is a normal token with leading space. Clear the leading space |
| // marker on the first token to get proper expansion. |
| Tok.clearFlag(Token::LeadingSpace); |
| } else if (Tok.is(tok::l_paren)) { |
| // This is a function-like macro definition. Read the argument list. |
| MI->setIsFunctionLike(); |
| if (ReadMacroDefinitionArgList(MI)) { |
| // Forget about MI. |
| ReleaseMacroInfo(MI); |
| // Throw away the rest of the line. |
| if (CurPPLexer->ParsingPreprocessorDirective) |
| DiscardUntilEndOfDirective(); |
| return; |
| } |
| |
| // If this is a definition of a variadic C99 function-like macro, not using |
| // the GNU named varargs extension, enabled __VA_ARGS__. |
| |
| // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. |
| // This gets unpoisoned where it is allowed. |
| assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!"); |
| if (MI->isC99Varargs()) |
| Ident__VA_ARGS__->setIsPoisoned(false); |
| |
| // Read the first token after the arg list for down below. |
| LexUnexpandedToken(Tok); |
| } else if (Features.C99) { |
| // C99 requires whitespace between the macro definition and the body. Emit |
| // a diagnostic for something like "#define X+". |
| Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name); |
| } else { |
| // C90 6.8 TC1 says: "In the definition of an object-like macro, if the |
| // first character of a replacement list is not a character required by |
| // subclause 5.2.1, then there shall be white-space separation between the |
| // identifier and the replacement list.". 5.2.1 lists this set: |
| // "A-Za-z0-9!"#%&'()*+,_./:;<=>?[\]^_{|}~" as well as whitespace, which |
| // is irrelevant here. |
| bool isInvalid = false; |
| if (Tok.is(tok::at)) // @ is not in the list above. |
| isInvalid = true; |
| else if (Tok.is(tok::unknown)) { |
| // If we have an unknown token, it is something strange like "`". Since |
| // all of valid characters would have lexed into a single character |
| // token of some sort, we know this is not a valid case. |
| isInvalid = true; |
| } |
| if (isInvalid) |
| Diag(Tok, diag::ext_missing_whitespace_after_macro_name); |
| else |
| Diag(Tok, diag::warn_missing_whitespace_after_macro_name); |
| } |
| |
| if (!Tok.is(tok::eod)) |
| LastTok = Tok; |
| |
| // Read the rest of the macro body. |
| if (MI->isObjectLike()) { |
| // Object-like macros are very simple, just read their body. |
| while (Tok.isNot(tok::eod)) { |
| LastTok = Tok; |
| MI->AddTokenToBody(Tok); |
| // Get the next token of the macro. |
| LexUnexpandedToken(Tok); |
| } |
| |
| } else { |
| // Otherwise, read the body of a function-like macro. While we are at it, |
| // check C99 6.10.3.2p1: ensure that # operators are followed by macro |
| // parameters in function-like macro expansions. |
| while (Tok.isNot(tok::eod)) { |
| LastTok = Tok; |
| |
| if (Tok.isNot(tok::hash)) { |
| MI->AddTokenToBody(Tok); |
| |
| // Get the next token of the macro. |
| LexUnexpandedToken(Tok); |
| continue; |
| } |
| |
| // Get the next token of the macro. |
| LexUnexpandedToken(Tok); |
| |
| // Check for a valid macro arg identifier. |
| if (Tok.getIdentifierInfo() == 0 || |
| MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) { |
| |
| // If this is assembler-with-cpp mode, we accept random gibberish after |
| // the '#' because '#' is often a comment character. However, change |
| // the kind of the token to tok::unknown so that the preprocessor isn't |
| // confused. |
| if (getLangOptions().AsmPreprocessor && Tok.isNot(tok::eod)) { |
| LastTok.setKind(tok::unknown); |
| } else { |
| Diag(Tok, diag::err_pp_stringize_not_parameter); |
| ReleaseMacroInfo(MI); |
| |
| // Disable __VA_ARGS__ again. |
| Ident__VA_ARGS__->setIsPoisoned(true); |
| return; |
| } |
| } |
| |
| // Things look ok, add the '#' and param name tokens to the macro. |
| MI->AddTokenToBody(LastTok); |
| MI->AddTokenToBody(Tok); |
| LastTok = Tok; |
| |
| // Get the next token of the macro. |
| LexUnexpandedToken(Tok); |
| } |
| } |
| |
| |
| // Disable __VA_ARGS__ again. |
| Ident__VA_ARGS__->setIsPoisoned(true); |
| |
| // Check that there is no paste (##) operator at the beginning or end of the |
| // replacement list. |
| unsigned NumTokens = MI->getNumTokens(); |
| if (NumTokens != 0) { |
| if (MI->getReplacementToken(0).is(tok::hashhash)) { |
| Diag(MI->getReplacementToken(0), diag::err_paste_at_start); |
| ReleaseMacroInfo(MI); |
| return; |
| } |
| if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) { |
| Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end); |
| ReleaseMacroInfo(MI); |
| return; |
| } |
| } |
| |
| MI->setDefinitionEndLoc(LastTok.getLocation()); |
| |
| // Finally, if this identifier already had a macro defined for it, verify that |
| // the macro bodies are identical and free the old definition. |
| if (MacroInfo *OtherMI = getMacroInfo(MacroNameTok.getIdentifierInfo())) { |
| // It is very common for system headers to have tons of macro redefinitions |
| // and for warnings to be disabled in system headers. If this is the case, |
| // then don't bother calling MacroInfo::isIdenticalTo. |
| if (!getDiagnostics().getSuppressSystemWarnings() || |
| !SourceMgr.isInSystemHeader(DefineTok.getLocation())) { |
| if (!OtherMI->isUsed() && OtherMI->isWarnIfUnused()) |
| Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used); |
| |
| // Macros must be identical. This means all tokens and whitespace |
| // separation must be the same. C99 6.10.3.2. |
| if (!OtherMI->isAllowRedefinitionsWithoutWarning() && |
| !MI->isIdenticalTo(*OtherMI, *this)) { |
| Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef) |
| << MacroNameTok.getIdentifierInfo(); |
| Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition); |
| } |
| } |
| if (OtherMI->isWarnIfUnused()) |
| WarnUnusedMacroLocs.erase(OtherMI->getDefinitionLoc()); |
| ReleaseMacroInfo(OtherMI); |
| } |
| |
| setMacroInfo(MacroNameTok.getIdentifierInfo(), MI); |
| |
| assert(!MI->isUsed()); |
| // If we need warning for not using the macro, add its location in the |
| // warn-because-unused-macro set. If it gets used it will be removed from set. |
| if (isInPrimaryFile() && // don't warn for include'd macros. |
| Diags->getDiagnosticLevel(diag::pp_macro_not_used, |
| MI->getDefinitionLoc()) != Diagnostic::Ignored) { |
| MI->setIsWarnIfUnused(true); |
| WarnUnusedMacroLocs.insert(MI->getDefinitionLoc()); |
| } |
| |
| // If the callbacks want to know, tell them about the macro definition. |
| if (Callbacks) |
| Callbacks->MacroDefined(MacroNameTok, MI); |
| } |
| |
| /// HandleUndefDirective - Implements #undef. |
| /// |
| void Preprocessor::HandleUndefDirective(Token &UndefTok) { |
| ++NumUndefined; |
| |
| Token MacroNameTok; |
| ReadMacroName(MacroNameTok, 2); |
| |
| // Error reading macro name? If so, diagnostic already issued. |
| if (MacroNameTok.is(tok::eod)) |
| return; |
| |
| // Check to see if this is the last token on the #undef line. |
| CheckEndOfDirective("undef"); |
| |
| // Okay, we finally have a valid identifier to undef. |
| MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo()); |
| |
| // If the macro is not defined, this is a noop undef, just return. |
| if (MI == 0) return; |
| |
| if (!MI->isUsed() && MI->isWarnIfUnused()) |
| Diag(MI->getDefinitionLoc(), diag::pp_macro_not_used); |
| |
| // If the callbacks want to know, tell them about the macro #undef. |
| if (Callbacks) |
| Callbacks->MacroUndefined(MacroNameTok, MI); |
| |
| if (MI->isWarnIfUnused()) |
| WarnUnusedMacroLocs.erase(MI->getDefinitionLoc()); |
| |
| // Free macro definition. |
| ReleaseMacroInfo(MI); |
| setMacroInfo(MacroNameTok.getIdentifierInfo(), 0); |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // Preprocessor Conditional Directive Handling. |
| //===----------------------------------------------------------------------===// |
| |
| /// HandleIfdefDirective - Implements the #ifdef/#ifndef directive. isIfndef is |
| /// true when this is a #ifndef directive. ReadAnyTokensBeforeDirective is true |
| /// if any tokens have been returned or pp-directives activated before this |
| /// #ifndef has been lexed. |
| /// |
| void Preprocessor::HandleIfdefDirective(Token &Result, bool isIfndef, |
| bool ReadAnyTokensBeforeDirective) { |
| ++NumIf; |
| Token DirectiveTok = Result; |
| |
| Token MacroNameTok; |
| ReadMacroName(MacroNameTok); |
| |
| // Error reading macro name? If so, diagnostic already issued. |
| if (MacroNameTok.is(tok::eod)) { |
| // Skip code until we get to #endif. This helps with recovery by not |
| // emitting an error when the #endif is reached. |
| SkipExcludedConditionalBlock(DirectiveTok.getLocation(), |
| /*Foundnonskip*/false, /*FoundElse*/false); |
| return; |
| } |
| |
| // Check to see if this is the last token on the #if[n]def line. |
| CheckEndOfDirective(isIfndef ? "ifndef" : "ifdef"); |
| |
| IdentifierInfo *MII = MacroNameTok.getIdentifierInfo(); |
| MacroInfo *MI = getMacroInfo(MII); |
| |
| if (CurPPLexer->getConditionalStackDepth() == 0) { |
| // If the start of a top-level #ifdef and if the macro is not defined, |
| // inform MIOpt that this might be the start of a proper include guard. |
| // Otherwise it is some other form of unknown conditional which we can't |
| // handle. |
| if (!ReadAnyTokensBeforeDirective && MI == 0) { |
| assert(isIfndef && "#ifdef shouldn't reach here"); |
| CurPPLexer->MIOpt.EnterTopLevelIFNDEF(MII); |
| } else |
| CurPPLexer->MIOpt.EnterTopLevelConditional(); |
| } |
| |
| // If there is a macro, process it. |
| if (MI) // Mark it used. |
| markMacroAsUsed(MI); |
| |
| // Should we include the stuff contained by this directive? |
| if (!MI == isIfndef) { |
| // Yes, remember that we are inside a conditional, then lex the next token. |
| CurPPLexer->pushConditionalLevel(DirectiveTok.getLocation(), |
| /*wasskip*/false, /*foundnonskip*/true, |
| /*foundelse*/false); |
| } else { |
| // No, skip the contents of this block. |
| SkipExcludedConditionalBlock(DirectiveTok.getLocation(), |
| /*Foundnonskip*/false, |
| /*FoundElse*/false); |
| } |
| |
| if (Callbacks) { |
| if (isIfndef) |
| Callbacks->Ifndef(MacroNameTok); |
| else |
| Callbacks->Ifdef(MacroNameTok); |
| } |
| } |
| |
| /// HandleIfDirective - Implements the #if directive. |
| /// |
| void Preprocessor::HandleIfDirective(Token &IfToken, |
| bool ReadAnyTokensBeforeDirective) { |
| ++NumIf; |
| |
| // Parse and evaluate the conditional expression. |
| IdentifierInfo *IfNDefMacro = 0; |
| const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation(); |
| const bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro); |
| const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation(); |
| |
| // If this condition is equivalent to #ifndef X, and if this is the first |
| // directive seen, handle it for the multiple-include optimization. |
| if (CurPPLexer->getConditionalStackDepth() == 0) { |
| if (!ReadAnyTokensBeforeDirective && IfNDefMacro && ConditionalTrue) |
| CurPPLexer->MIOpt.EnterTopLevelIFNDEF(IfNDefMacro); |
| else |
| CurPPLexer->MIOpt.EnterTopLevelConditional(); |
| } |
| |
| // Should we include the stuff contained by this directive? |
| if (ConditionalTrue) { |
| // Yes, remember that we are inside a conditional, then lex the next token. |
| CurPPLexer->pushConditionalLevel(IfToken.getLocation(), /*wasskip*/false, |
| /*foundnonskip*/true, /*foundelse*/false); |
| } else { |
| // No, skip the contents of this block. |
| SkipExcludedConditionalBlock(IfToken.getLocation(), /*Foundnonskip*/false, |
| /*FoundElse*/false); |
| } |
| |
| if (Callbacks) |
| Callbacks->If(SourceRange(ConditionalBegin, ConditionalEnd)); |
| } |
| |
| /// HandleEndifDirective - Implements the #endif directive. |
| /// |
| void Preprocessor::HandleEndifDirective(Token &EndifToken) { |
| ++NumEndif; |
| |
| // Check that this is the whole directive. |
| CheckEndOfDirective("endif"); |
| |
| PPConditionalInfo CondInfo; |
| if (CurPPLexer->popConditionalLevel(CondInfo)) { |
| // No conditionals on the stack: this is an #endif without an #if. |
| Diag(EndifToken, diag::err_pp_endif_without_if); |
| return; |
| } |
| |
| // If this the end of a top-level #endif, inform MIOpt. |
| if (CurPPLexer->getConditionalStackDepth() == 0) |
| CurPPLexer->MIOpt.ExitTopLevelConditional(); |
| |
| assert(!CondInfo.WasSkipping && !CurPPLexer->LexingRawMode && |
| "This code should only be reachable in the non-skipping case!"); |
| |
| if (Callbacks) |
| Callbacks->Endif(); |
| } |
| |
| /// HandleElseDirective - Implements the #else directive. |
| /// |
| void Preprocessor::HandleElseDirective(Token &Result) { |
| ++NumElse; |
| |
| // #else directive in a non-skipping conditional... start skipping. |
| CheckEndOfDirective("else"); |
| |
| PPConditionalInfo CI; |
| if (CurPPLexer->popConditionalLevel(CI)) { |
| Diag(Result, diag::pp_err_else_without_if); |
| return; |
| } |
| |
| // If this is a top-level #else, inform the MIOpt. |
| if (CurPPLexer->getConditionalStackDepth() == 0) |
| CurPPLexer->MIOpt.EnterTopLevelConditional(); |
| |
| // If this is a #else with a #else before it, report the error. |
| if (CI.FoundElse) Diag(Result, diag::pp_err_else_after_else); |
| |
| // Finally, skip the rest of the contents of this block. |
| SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, |
| /*FoundElse*/true); |
| |
| if (Callbacks) |
| Callbacks->Else(); |
| } |
| |
| /// HandleElifDirective - Implements the #elif directive. |
| /// |
| void Preprocessor::HandleElifDirective(Token &ElifToken) { |
| ++NumElse; |
| |
| // #elif directive in a non-skipping conditional... start skipping. |
| // We don't care what the condition is, because we will always skip it (since |
| // the block immediately before it was included). |
| const SourceLocation ConditionalBegin = CurPPLexer->getSourceLocation(); |
| DiscardUntilEndOfDirective(); |
| const SourceLocation ConditionalEnd = CurPPLexer->getSourceLocation(); |
| |
| PPConditionalInfo CI; |
| if (CurPPLexer->popConditionalLevel(CI)) { |
| Diag(ElifToken, diag::pp_err_elif_without_if); |
| return; |
| } |
| |
| // If this is a top-level #elif, inform the MIOpt. |
| if (CurPPLexer->getConditionalStackDepth() == 0) |
| CurPPLexer->MIOpt.EnterTopLevelConditional(); |
| |
| // If this is a #elif with a #else before it, report the error. |
| if (CI.FoundElse) Diag(ElifToken, diag::pp_err_elif_after_else); |
| |
| // Finally, skip the rest of the contents of this block. |
| SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, |
| /*FoundElse*/CI.FoundElse); |
| |
| if (Callbacks) |
| Callbacks->Elif(SourceRange(ConditionalBegin, ConditionalEnd)); |
| } |