diff options
Diffstat (limited to 'lib/Lex/PPDirectives.cpp')
| -rw-r--r-- | lib/Lex/PPDirectives.cpp | 1665 |
1 files changed, 1665 insertions, 0 deletions
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp new file mode 100644 index 000000000000..af59ded27544 --- /dev/null +++ b/lib/Lex/PPDirectives.cpp @@ -0,0 +1,1665 @@ +//===--- 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/Basic/SourceManager.h" +#include "llvm/ADT/APInt.h" +using namespace clang; + +//===----------------------------------------------------------------------===// +// Utility Methods for Preprocessor Directive Handling. +//===----------------------------------------------------------------------===// + +MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) { + MacroInfo *MI; + + if (!MICache.empty()) { + MI = MICache.back(); + MICache.pop_back(); + } else + MI = (MacroInfo*) BP.Allocate<MacroInfo>(); + new (MI) MacroInfo(L); + return MI; +} + +/// ReleaseMacroInfo - Release the specified MacroInfo. This memory will +/// be reused for allocating new MacroInfo objects. +void Preprocessor::ReleaseMacroInfo(MacroInfo* MI) { + MICache.push_back(MI); + MI->FreeArgumentList(BP); +} + + +/// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the +/// current line until the tok::eom token is found. +void Preprocessor::DiscardUntilEndOfDirective() { + Token Tmp; + do { + LexUnexpandedToken(Tmp); + } while (Tmp.isNot(tok::eom)); +} + +/// ReadMacroName - Lex and validate a macro name, which occurs after a +/// #define or #undef. This sets the token kind to eom 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); + + // Missing macro name? + if (MacroNameTok.is(tok::eom)) { + Diag(MacroNameTok, diag::err_pp_missing_macro_name); + return; + } + + IdentifierInfo *II = MacroNameTok.getIdentifierInfo(); + if (II == 0) { + std::string Spelling = getSpelling(MacroNameTok); + 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::eom. + MacroNameTok.setKind(tok::eom); + return DiscardUntilEndOfDirective(); +} + +/// CheckEndOfDirective - Ensure that the next token is a tok::eom token. If +/// not, emit a diagnostic and consume up until the eom. 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::eom)) { + // Add a fixit in GNU/C99/C++ mode. Don't offer a fixit for strict-C89, + // because it is more trouble than it is worth to insert /**/ and check that + // there is no /**/ in the range also. + CodeModificationHint FixItHint; + if (Features.GNUMode || Features.C99 || Features.CPlusPlus) + FixItHint = CodeModificationHint::CreateInsertion(Tmp.getLocation(),"//"); + Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType << FixItHint; + 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) { + if (CurLexer) + CurLexer->Lex(Tok); + else + CurPTHLexer->Lex(Tok); + + // 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()) { + 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 EOM 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::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 = SourceMgr.getCharacterData(Tok.getLocation()); + 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. + // TODO: could do this with zero copies in the no-clean case by using + // strncmp below. + char Directive[20]; + unsigned IdLen; + if (!Tok.needsCleaning() && Tok.getLength() < 20) { + IdLen = Tok.getLength(); + memcpy(Directive, RawCharData, IdLen); + Directive[IdLen] = 0; + } else { + std::string DirectiveStr = getSpelling(Tok); + IdLen = DirectiveStr.size(); + if (IdLen >= 20) { + CurPPLexer->ParsingPreprocessorDirective = false; + // Restore comment saving mode. + if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments); + continue; + } + memcpy(Directive, &DirectiveStr[0], IdLen); + Directive[IdLen] = 0; + FirstChar = Directive[0]; + } + + if (FirstChar == 'i' && Directive[1] == 'f') { + if ((IdLen == 2) || // "if" + (IdLen == 5 && !strcmp(Directive+2, "def")) || // "ifdef" + (IdLen == 6 && !strcmp(Directive+2, "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, + /*fnddelse*/false); + } + } else if (FirstChar == 'e') { + if (IdLen == 5 && !strcmp(Directive+1, "ndif")) { // "endif" + CheckEndOfDirective("endif"); + PPConditionalInfo CondInfo; + CondInfo.WasSkipping = true; // Silence bogus warning. + bool InCond = CurPPLexer->popConditionalLevel(CondInfo); + InCond = 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 (IdLen == 4 && !strcmp(Directive+1, "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. + DiscardUntilEndOfDirective(); // C99 6.10p4. + 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; + break; + } + } else if (IdLen == 4 && !strcmp(Directive+1, "lif")) { // "elif". + PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel(); + + bool ShouldEnter; + // 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; + } + + // 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; + 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); + InCond = 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 eom 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(const char *FilenameStart, + const char *FilenameEnd, + bool isAngled, + const DirectoryLookup *FromDir, + const DirectoryLookup *&CurDir) { + // 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(FilenameStart, FilenameEnd, + isAngled, FromDir, CurDir, CurFileEnt); + 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(FilenameStart, FilenameEnd, + CurFileEnt))) + 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(FilenameStart, + FilenameEnd, CurFileEnt))) + 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 + // EOM 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::eom: + return; // null directive. + case tok::comment: + // Handle stuff like "# /*foo*/ define X" in -E -C mode. + LexUnexpandedToken(Result); + goto TryAgain; + + 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: + return HandleIncludeDirective(Result); // Handle #include. + case tok::pp___include_macros: + return HandleIncludeMacrosDirective(Result); // Handle -imacros. + + // 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(); + + // GNU Extensions. + case tok::pp_import: + return HandleImportDirective(Result); + case tok::pp_include_next: + return HandleIncludeNextDirective(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; + // 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::eom)) + PP.DiscardUntilEndOfDirective(); + return true; + } + + llvm::SmallString<64> IntegerBuffer; + IntegerBuffer.resize(DigitTok.getLength()); + const char *DigitTokBegin = &IntegerBuffer[0]; + unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin); + + // 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 "eom", then it wasn't present. Otherwise, it must be a + // string followed by eom. + if (StrTok.is(tok::eom)) + ; // 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(), + Literal.GetStringLength()); + + // Verify that there is nothing after the string, other than EOM. 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(DigitTok.getLocation(), 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::eom)) 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::eom)) 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.getDecomposedInstantiationLoc(FlagTok.getLocation()).first; + PresumedLoc PLoc = SM.getPresumedLoc(FlagTok.getLocation()); + + // 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.getDecomposedInstantiationLoc(IncLoc).first != CurFileID) { + PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_pop); + PP.DiscardUntilEndOfDirective(); + return true; + } + + PP.Lex(FlagTok); + if (FlagTok.is(tok::eom)) 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::eom)) 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::eom)) 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 "eom", then it wasn't present. Otherwise, it must be a + // string followed by eom. + if (StrTok.is(tok::eom)) + ; // 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(), + Literal.GetStringLength()); + + // 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(DigitTok.getLocation(), 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::eom)) + DiscardUntilEndOfDirective(); + return; + } + + // Verify that there is nothing after the string, other than EOM. + CheckEndOfDirective("ident"); + + if (Callbacks) + Callbacks->Ident(Tok.getLocation(), getSpelling(StrTok)); +} + +//===----------------------------------------------------------------------===// +// 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, + const char *&BufStart, + const char *&BufEnd) { + // Get the text form of the filename. + assert(BufStart != BufEnd && "Can't have tokens with empty spellings!"); + + // Make sure the filename is <x> or "x". + bool isAngled; + if (BufStart[0] == '<') { + if (BufEnd[-1] != '>') { + Diag(Loc, diag::err_pp_expects_filename); + BufStart = 0; + return true; + } + isAngled = true; + } else if (BufStart[0] == '"') { + if (BufEnd[-1] != '"') { + Diag(Loc, diag::err_pp_expects_filename); + BufStart = 0; + return true; + } + isAngled = false; + } else { + Diag(Loc, diag::err_pp_expects_filename); + BufStart = 0; + return true; + } + + // Diagnose #include "" as invalid. + if (BufEnd-BufStart <= 2) { + Diag(Loc, diag::err_pp_empty_filename); + BufStart = 0; + return ""; + } + + // Skip the brackets. + ++BufStart; + --BufEnd; + 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 EOM marker. +static bool ConcatenateIncludeName(llvm::SmallVector<char, 128> &FilenameBuffer, + Preprocessor &PP) { + Token CurTok; + + PP.Lex(CurTok); + while (CurTok.isNot(tok::eom)) { + // 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 = PP.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; + + PP.Lex(CurTok); + } + + // If we hit the eom marker, emit an error and return true so that the caller + // knows the EOM has been read. + PP.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(Token &IncludeTok, + const DirectoryLookup *LookupFrom, + bool isImport) { + + Token FilenameTok; + CurPPLexer->LexIncludeFilename(FilenameTok); + + // Reserve a buffer to get the spelling. + llvm::SmallVector<char, 128> FilenameBuffer; + const char *FilenameStart, *FilenameEnd; + + switch (FilenameTok.getKind()) { + case tok::eom: + // If the token kind is EOM, the error has already been diagnosed. + return; + + case tok::angle_string_literal: + case tok::string_literal: { + FilenameBuffer.resize(FilenameTok.getLength()); + FilenameStart = &FilenameBuffer[0]; + unsigned Len = getSpelling(FilenameTok, FilenameStart); + FilenameEnd = FilenameStart+Len; + 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, *this)) + return; // Found <eom> but no ">"? Diagnostic already emitted. + FilenameStart = FilenameBuffer.data(); + FilenameEnd = FilenameStart + FilenameBuffer.size(); + break; + default: + Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename); + DiscardUntilEndOfDirective(); + return; + } + + bool isAngled = GetIncludeFilenameSpelling(FilenameTok.getLocation(), + FilenameStart, FilenameEnd); + // If GetIncludeFilenameSpelling set the start ptr to null, there was an + // error. + if (FilenameStart == 0) { + DiscardUntilEndOfDirective(); + return; + } + + // Verify that there is nothing after the filename, other than EOM. 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()->getName(), 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; + const FileEntry *File = LookupFile(FilenameStart, FilenameEnd, + isAngled, LookupFrom, CurDir); + if (File == 0) { + Diag(FilenameTok, diag::err_pp_file_not_found) + << std::string(FilenameStart, FilenameEnd); + return; + } + + // Ask HeaderInfo if we should enter this #include file. If not, #including + // this file will have no effect. + if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) + 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())); + + // Look up the file, create a File ID for it. + FileID FID = SourceMgr.createFileID(File, FilenameTok.getLocation(), + FileCharacter); + if (FID.isInvalid()) { + Diag(FilenameTok, diag::err_pp_file_not_found) + << std::string(FilenameStart, FilenameEnd); + return; + } + + // Finally, if all is good, enter the new file! + EnterSourceFile(FID, CurDir); +} + +/// HandleIncludeNextDirective - Implements #include_next. +/// +void Preprocessor::HandleIncludeNextDirective(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(IncludeNextTok, Lookup); +} + +/// HandleImportDirective - Implements #import. +/// +void Preprocessor::HandleImportDirective(Token &ImportTok) { + if (!Features.ObjC1) // #import is standard for ObjC. + Diag(ImportTok, diag::ext_pp_import_directive); + + return HandleIncludeDirective(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(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(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) { + llvm::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::eom: // #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::eom)) + 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::eom)) { + // 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::eom)) + 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::eom)) { + 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::eom)) { + 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::eom)) { + 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 begining 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; + } + } + + // If this is the primary source file, remember that this macro hasn't been + // used yet. + if (isInPrimaryFile()) + MI->setIsUsed(false); + + 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()) + Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used); + + // Macros must be identical. This means all tokes and whitespace + // separation must be the same. C99 6.10.3.2. + if (!MI->isIdenticalTo(*OtherMI, *this)) { + Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef) + << MacroNameTok.getIdentifierInfo(); + Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition); + } + } + + ReleaseMacroInfo(OtherMI); + } + + setMacroInfo(MacroNameTok.getIdentifierInfo(), MI); + + // If the callbacks want to know, tell them about the macro definition. + if (Callbacks) + Callbacks->MacroDefined(MacroNameTok.getIdentifierInfo(), 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::eom)) + 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()) + 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.getIdentifierInfo(), MI); + + // 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::eom)) { + // 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"); + + if (CurPPLexer->getConditionalStackDepth() == 0) { + // If the start of a top-level #ifdef, inform MIOpt. + if (!ReadAnyTokensBeforeDirective) { + assert(isIfndef && "#ifdef shouldn't reach here"); + CurPPLexer->MIOpt.EnterTopLevelIFNDEF(MacroNameTok.getIdentifierInfo()); + } else + CurPPLexer->MIOpt.EnterTopLevelConditional(); + } + + IdentifierInfo *MII = MacroNameTok.getIdentifierInfo(); + MacroInfo *MI = getMacroInfo(MII); + + // If there is a macro, process it. + if (MI) // Mark it used. + MI->setIsUsed(true); + + // 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 and return the first token after it. + SkipExcludedConditionalBlock(DirectiveTok.getLocation(), + /*Foundnonskip*/false, + /*FoundElse*/false); + } +} + +/// HandleIfDirective - Implements the #if directive. +/// +void Preprocessor::HandleIfDirective(Token &IfToken, + bool ReadAnyTokensBeforeDirective) { + ++NumIf; + + // Parse and evaluation the conditional expression. + IdentifierInfo *IfNDefMacro = 0; + bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro); + + + // 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) + 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 and return the first token after it. + 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!"); +} + + +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 and return the first + // token after it. + return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, + /*FoundElse*/true); +} + +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). + DiscardUntilEndOfDirective(); + + 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 and return the first + // token after it. + return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, + /*FoundElse*/CI.FoundElse); +} + |