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Diffstat (limited to 'clang/lib/Lex/PPDirectives.cpp')
| -rw-r--r-- | clang/lib/Lex/PPDirectives.cpp | 2075 |
1 files changed, 2075 insertions, 0 deletions
diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp new file mode 100644 index 0000000..625a204 --- /dev/null +++ b/clang/lib/Lex/PPDirectives.cpp @@ -0,0 +1,2075 @@ +//===--- 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/ModuleLoader.h" +#include "clang/Lex/Pragma.h" +#include "clang/Basic/FileManager.h" +#include "clang/Basic/SourceManager.h" +#include "llvm/ADT/APInt.h" +#include "llvm/Support/ErrorHandling.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); + setCodeCompletionReached(); + LexUnexpandedToken(MacroNameTok); + } + + // 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); + + // Allow #defining |and| and friends in microsoft mode. + if (Info.isCPlusPlusOperatorKeyword() && getLangOpts().MicrosoftMode) { + MacroNameTok.setIdentifierInfo(getIdentifierInfo(Spelling)); + return; + } + + 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 ((LangOpts.GNUMode || LangOpts.C99 || LangOpts.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, + SourceLocation ElseLoc) { + ++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(); + setCodeCompletionReached(); + 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 (CurLexer->getFileLoc() != CodeCompletionFileLoc) + 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); + } + } 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) { + if (Callbacks) + Callbacks->Endif(Tok.getLocation(), CondInfo.IfLoc); + 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 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"); + if (Callbacks) + Callbacks->Else(Tok.getLocation(), CondInfo.IfLoc); + 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 this condition is true, enter it! + if (ShouldEnter) { + CondInfo.FoundNonSkip = true; + if (Callbacks) + Callbacks->Elif(Tok.getLocation(), + SourceRange(ConditionalBegin, ConditionalEnd), + CondInfo.IfLoc); + 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; + + if (Callbacks) { + SourceLocation BeginLoc = ElseLoc.isValid() ? ElseLoc : IfTokenLoc; + Callbacks->SourceRangeSkipped(SourceRange(BeginLoc, Tok.getLocation())); + } +} + +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, + Module **SuggestedModule, + bool SkipCache) { + // 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, SuggestedModule, SkipCache); + 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. + // FIXME: SuggestedModule! + 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 undefined behavior, emit a diagnostic. Do + // not support this for #include-like directives, since that can result in + // terrible diagnostics, and does not work in GCC. + if (InMacroArgs) { + if (IdentifierInfo *II = Result.getIdentifierInfo()) { + switch (II->getPPKeywordID()) { + case tok::pp_include: + case tok::pp_import: + case tok::pp_include_next: + case tok::pp___include_macros: + Diag(Result, diag::err_embedded_include) << II->getName(); + DiscardUntilEndOfDirective(); + return; + default: + break; + } + } + 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); + setCodeCompletionReached(); + return; + case tok::numeric_constant: // # 7 GNU line marker directive. + if (getLangOpts().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; + + case tok::pp___public_macro: + if (getLangOpts().Modules) + return HandleMacroPublicDirective(Result); + break; + + case tok::pp___private_macro: + if (getLangOpts().Modules) + return HandleMacroPrivateDirective(Result); + 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 (getLangOpts().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; + } + + 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 = 32768U; + if (LangOpts.C99 || LangOpts.CPlusPlus0x) + LineLimit = 2147483648U; + if (LineNo >= LineLimit) + Diag(DigitTok, diag::ext_pp_line_too_big) << LineLimit; + else if (LangOpts.CPlusPlus0x && LineNo >= 32768U) + Diag(DigitTok, diag::warn_cxx98_compat_pp_line_too_big); + + 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); + return DiscardUntilEndOfDirective(); + } else if (StrTok.hasUDSuffix()) { + Diag(StrTok, diag::err_invalid_string_udl); + return DiscardUntilEndOfDirective(); + } else { + // Parse and validate the string, converting it into a unique ID. + StringLiteralParser Literal(&StrTok, 1, *this); + assert(Literal.isAscii() && "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 if (StrTok.hasUDSuffix()) { + Diag(StrTok, diag::err_invalid_string_udl); + return DiscardUntilEndOfDirective(); + } else { + // Parse and validate the string, converting it into a unique ID. + StringLiteralParser Literal(&StrTok, 1, *this); + assert(Literal.isAscii() && "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(); + + // Find the first non-whitespace character, so that we can make the + // diagnostic more succinct. + StringRef Msg(Message); + size_t i = Msg.find_first_not_of(' '); + if (i < Msg.size()) + Msg = Msg.substr(i); + + if (isWarning) + Diag(Tok, diag::pp_hash_warning) << Msg; + else + Diag(Tok, diag::err_pp_hash_error) << Msg; +} + +/// 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; + } + + if (StrTok.hasUDSuffix()) { + Diag(StrTok, diag::err_invalid_string_udl); + return DiscardUntilEndOfDirective(); + } + + // 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); + } +} + +/// \brief Handle a #public directive. +void Preprocessor::HandleMacroPublicDirective(Token &Tok) { + 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 #__public_macro line. + CheckEndOfDirective("__public_macro"); + + // Okay, we finally have a valid identifier to undef. + MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo()); + + // If the macro is not defined, this is an error. + if (MI == 0) { + Diag(MacroNameTok, diag::err_pp_visibility_non_macro) + << MacroNameTok.getIdentifierInfo(); + return; + } + + // Note that this macro has now been exported. + MI->setVisibility(/*IsPublic=*/true, MacroNameTok.getLocation()); + + // If this macro definition came from a PCH file, mark it + // as having changed since serialization. + if (MI->isFromAST()) + MI->setChangedAfterLoad(); +} + +/// \brief Handle a #private directive. +void Preprocessor::HandleMacroPrivateDirective(Token &Tok) { + 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 #__private_macro line. + CheckEndOfDirective("__private_macro"); + + // Okay, we finally have a valid identifier to undef. + MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo()); + + // If the macro is not defined, this is an error. + if (MI == 0) { + Diag(MacroNameTok, diag::err_pp_visibility_non_macro) + << MacroNameTok.getIdentifierInfo(); + return; + } + + // Note that this macro has now been marked private. + MI->setVisibility(/*IsPublic=*/false, MacroNameTok.getLocation()); + + // If this macro definition came from a PCH file, mark it + // as having changed since serialization. + if (MI->isFromAST()) + MI->setChangedAfterLoad(); +} + +//===----------------------------------------------------------------------===// +// 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( + 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)) { + setCodeCompletionReached(); + 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. + SmallString<128> FilenameBuffer; + StringRef Filename; + SourceLocation End; + SourceLocation CharEnd; // the end of this directive, in characters + + 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(); + CharEnd = End.getLocWithOffset(Filename.size()); + 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(); + CharEnd = getLocForEndOfToken(End); + break; + default: + Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename); + DiscardUntilEndOfDirective(); + return; + } + + StringRef OriginalFilename = Filename; + 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; + } + + // Complain about attempts to #include files in an audit pragma. + if (PragmaARCCFCodeAuditedLoc.isValid()) { + Diag(HashLoc, diag::err_pp_include_in_arc_cf_code_audited); + Diag(PragmaARCCFCodeAuditedLoc, diag::note_pragma_entered_here); + + // Immediately leave the pragma. + PragmaARCCFCodeAuditedLoc = SourceLocation(); + } + + if (HeaderInfo.HasIncludeAliasMap()) { + // Map the filename with the brackets still attached. If the name doesn't + // map to anything, fall back on the filename we've already gotten the + // spelling for. + StringRef NewName = HeaderInfo.MapHeaderToIncludeAlias(OriginalFilename); + if (!NewName.empty()) + Filename = NewName; + } + + // Search include directories. + const DirectoryLookup *CurDir; + SmallString<1024> SearchPath; + SmallString<1024> RelativePath; + // We get the raw path only if we have 'Callbacks' to which we later pass + // the path. + Module *SuggestedModule = 0; + const FileEntry *File = LookupFile( + Filename, isAngled, LookupFrom, CurDir, + Callbacks ? &SearchPath : NULL, Callbacks ? &RelativePath : NULL, + getLangOpts().Modules? &SuggestedModule : 0); + + if (Callbacks) { + if (!File) { + // Give the clients a chance to recover. + SmallString<128> RecoveryPath; + if (Callbacks->FileNotFound(Filename, RecoveryPath)) { + if (const DirectoryEntry *DE = FileMgr.getDirectory(RecoveryPath)) { + // Add the recovery path to the list of search paths. + DirectoryLookup DL(DE, SrcMgr::C_User, true, false); + HeaderInfo.AddSearchPath(DL, isAngled); + + // Try the lookup again, skipping the cache. + File = LookupFile(Filename, isAngled, LookupFrom, CurDir, 0, 0, + getLangOpts().Modules? &SuggestedModule : 0, + /*SkipCache*/true); + } + } + } + + // Notify the callback object that we've seen an inclusion directive. + Callbacks->InclusionDirective(HashLoc, IncludeTok, Filename, isAngled, File, + End, SearchPath, RelativePath); + } + + if (File == 0) { + if (!SuppressIncludeNotFoundError) + Diag(FilenameTok, diag::err_pp_file_not_found) << Filename; + return; + } + + // If we are supposed to import a module rather than including the header, + // do so now. + if (SuggestedModule) { + // Compute the module access path corresponding to this module. + // FIXME: Should we have a second loadModule() overload to avoid this + // extra lookup step? + llvm::SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path; + for (Module *Mod = SuggestedModule; Mod; Mod = Mod->Parent) + Path.push_back(std::make_pair(getIdentifierInfo(Mod->Name), + FilenameTok.getLocation())); + std::reverse(Path.begin(), Path.end()); + + // Warn that we're replacing the include/import with a module import. + SmallString<128> PathString; + for (unsigned I = 0, N = Path.size(); I != N; ++I) { + if (I) + PathString += '.'; + PathString += Path[I].first->getName(); + } + int IncludeKind = 0; + + switch (IncludeTok.getIdentifierInfo()->getPPKeywordID()) { + case tok::pp_include: + IncludeKind = 0; + break; + + case tok::pp_import: + IncludeKind = 1; + break; + + case tok::pp_include_next: + IncludeKind = 2; + break; + + case tok::pp___include_macros: + IncludeKind = 3; + break; + + default: + llvm_unreachable("unknown include directive kind"); + } + + // Determine whether we are actually building the module that this + // include directive maps to. + bool BuildingImportedModule + = Path[0].first->getName() == getLangOpts().CurrentModule; + + if (!BuildingImportedModule && getLangOpts().ObjC2) { + // If we're not building the imported module, warn that we're going + // to automatically turn this inclusion directive into a module import. + // We only do this in Objective-C, where we have a module-import syntax. + CharSourceRange ReplaceRange(SourceRange(HashLoc, CharEnd), + /*IsTokenRange=*/false); + Diag(HashLoc, diag::warn_auto_module_import) + << IncludeKind << PathString + << FixItHint::CreateReplacement(ReplaceRange, + "@__experimental_modules_import " + PathString.str().str() + ";"); + } + + // Load the module. + // If this was an #__include_macros directive, only make macros visible. + Module::NameVisibilityKind Visibility + = (IncludeKind == 3)? Module::MacrosVisible : Module::AllVisible; + Module *Imported + = TheModuleLoader.loadModule(IncludeTok.getLocation(), Path, Visibility, + /*IsIncludeDirective=*/true); + + // If this header isn't part of the module we're building, we're done. + if (!BuildingImportedModule && Imported) + 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. + SourceLocation IncludePos = End; + // If the filename string was the result of macro expansions, set the include + // position on the file where it will be included and after the expansions. + if (IncludePos.isMacroID()) + IncludePos = SourceMgr.getExpansionRange(IncludePos).second; + FileID FID = SourceMgr.createFileID(File, IncludePos, 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); +} + +/// HandleMicrosoftImportDirective - Implements #import for Microsoft Mode +void Preprocessor::HandleMicrosoftImportDirective(Token &Tok) { + // The Microsoft #import directive takes a type library and generates header + // files from it, and includes those. This is beyond the scope of what clang + // does, so we ignore it and error out. However, #import can optionally have + // trailing attributes that span multiple lines. We're going to eat those + // so we can continue processing from there. + Diag(Tok, diag::err_pp_import_directive_ms ); + + // Read tokens until we get to the end of the directive. Note that the + // directive can be split over multiple lines using the backslash character. + DiscardUntilEndOfDirective(); +} + +/// HandleImportDirective - Implements #import. +/// +void Preprocessor::HandleImportDirective(SourceLocation HashLoc, + Token &ImportTok) { + if (!LangOpts.ObjC1) { // #import is standard for ObjC. + if (LangOpts.MicrosoftMode) + return HandleMicrosoftImportDirective(ImportTok); + 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, Token &Tok) { + SmallVector<IdentifierInfo*, 32> Arguments; + + 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 + if (!LangOpts.C99) + Diag(Tok, LangOpts.CPlusPlus0x ? + diag::warn_cxx98_compat_variadic_macro : + 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, LastTok)) { + // 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 (LangOpts.C99 || LangOpts.CPlusPlus0x) { + // 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 (getLangOpts().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()) != DiagnosticsEngine::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); + + if (Callbacks) { + if (isIfndef) + Callbacks->Ifndef(DirectiveTok.getLocation(), MacroNameTok); + else + Callbacks->Ifdef(DirectiveTok.getLocation(), MacroNameTok); + } + + // 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); + } +} + +/// 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(); + } + + if (Callbacks) + Callbacks->If(IfToken.getLocation(), + SourceRange(ConditionalBegin, ConditionalEnd)); + + // 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); + } +} + +/// 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(EndifToken.getLocation(), CondInfo.IfLoc); +} + +/// 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); + + if (Callbacks) + Callbacks->Else(Result.getLocation(), CI.IfLoc); + + // Finally, skip the rest of the contents of this block. + SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, + /*FoundElse*/true, Result.getLocation()); +} + +/// 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); + + if (Callbacks) + Callbacks->Elif(ElifToken.getLocation(), + SourceRange(ConditionalBegin, ConditionalEnd), CI.IfLoc); + + // Finally, skip the rest of the contents of this block. + SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, + /*FoundElse*/CI.FoundElse, + ElifToken.getLocation()); +} |