From 8c32b1a7daf246b26e52b46604d91ce3717e28e5 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 9 Mar 2008 04:10:46 +0000 Subject: [PATCH] Move a bunch more code out of Preprocessor.cpp into PPLexerChange.cpp git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@48080 91177308-0d34-0410-b5e6-96231b3b80d8 --- Lex/PPLexerChange.cpp | 373 ++++++++++++++++++++++++++++++++++++++++++ Lex/Preprocessor.cpp | 353 --------------------------------------- 2 files changed, 373 insertions(+), 353 deletions(-) create mode 100644 Lex/PPLexerChange.cpp diff --git a/Lex/PPLexerChange.cpp b/Lex/PPLexerChange.cpp new file mode 100644 index 0000000000..74d47ab294 --- /dev/null +++ b/Lex/PPLexerChange.cpp @@ -0,0 +1,373 @@ +//===--- PPLexerChange.cpp - Handle changing lexers in the 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 pieces of the Preprocessor interface that manage the +// current lexer stack. +// +//===----------------------------------------------------------------------===// + +#include "clang/Lex/Preprocessor.h" +#include "clang/Lex/HeaderSearch.h" +#include "clang/Lex/MacroInfo.h" +#include "clang/Lex/PPCallbacks.h" +#include "clang/Basic/Diagnostic.h" +#include "clang/Basic/SourceManager.h" +using namespace clang; + +PPCallbacks::~PPCallbacks() { +} + + +//===----------------------------------------------------------------------===// +// Source File Location Methods. +//===----------------------------------------------------------------------===// + +/// LookupFile - Given a "foo" or 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) { + SourceLocation FileLoc = getCurrentFileLexer()->getFileLoc(); + CurFileEnt = SourceMgr.getFileEntryForLoc(FileLoc); + } + + // 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 (CurLexer && !CurLexer->Is_PragmaLexer) { + if ((CurFileEnt = SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc()))) + 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 (ISEntry.TheLexer && !ISEntry.TheLexer->Is_PragmaLexer) { + if ((CurFileEnt = + SourceMgr.getFileEntryForLoc(ISEntry.TheLexer->getFileLoc()))) + if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, + FilenameEnd, CurFileEnt))) + return FE; + } + } + + // Otherwise, we really couldn't find the file. + return 0; +} + +/// isInPrimaryFile - Return true if we're in the top-level file, not in a +/// #include. +bool Preprocessor::isInPrimaryFile() const { + if (CurLexer && !CurLexer->Is_PragmaLexer) + return IncludeMacroStack.empty(); + + // If there are any stacked lexers, we're in a #include. + assert(IncludeMacroStack[0].TheLexer && + !IncludeMacroStack[0].TheLexer->Is_PragmaLexer && + "Top level include stack isn't our primary lexer?"); + for (unsigned i = 1, e = IncludeMacroStack.size(); i != e; ++i) + if (IncludeMacroStack[i].TheLexer && + !IncludeMacroStack[i].TheLexer->Is_PragmaLexer) + return false; + return true; +} + +/// getCurrentLexer - Return the current file lexer being lexed from. Note +/// that this ignores any potentially active macro expansions and _Pragma +/// expansions going on at the time. +Lexer *Preprocessor::getCurrentFileLexer() const { + if (CurLexer && !CurLexer->Is_PragmaLexer) return CurLexer; + + // Look for a stacked lexer. + for (unsigned i = IncludeMacroStack.size(); i != 0; --i) { + Lexer *L = IncludeMacroStack[i-1].TheLexer; + if (L && !L->Is_PragmaLexer) // Ignore macro & _Pragma expansions. + return L; + } + return 0; +} + + +/// EnterSourceFile - Add a source file to the top of the include stack and +/// start lexing tokens from it instead of the current buffer. Return true +/// on failure. +void Preprocessor::EnterSourceFile(unsigned FileID, + const DirectoryLookup *CurDir) { + assert(CurTokenLexer == 0 && "Cannot #include a file inside a macro!"); + ++NumEnteredSourceFiles; + + if (MaxIncludeStackDepth < IncludeMacroStack.size()) + MaxIncludeStackDepth = IncludeMacroStack.size(); + + Lexer *TheLexer = new Lexer(SourceLocation::getFileLoc(FileID, 0), *this); + EnterSourceFileWithLexer(TheLexer, CurDir); +} + +/// EnterSourceFile - Add a source file to the top of the include stack and +/// start lexing tokens from it instead of the current buffer. +void Preprocessor::EnterSourceFileWithLexer(Lexer *TheLexer, + const DirectoryLookup *CurDir) { + + // Add the current lexer to the include stack. + if (CurLexer || CurTokenLexer) + IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, + CurTokenLexer)); + + CurLexer = TheLexer; + CurDirLookup = CurDir; + CurTokenLexer = 0; + + // Notify the client, if desired, that we are in a new source file. + if (Callbacks && !CurLexer->Is_PragmaLexer) { + DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir; + + // Get the file entry for the current file. + if (const FileEntry *FE = + SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) + FileType = HeaderInfo.getFileDirFlavor(FE); + + Callbacks->FileChanged(CurLexer->getFileLoc(), + PPCallbacks::EnterFile, FileType); + } +} + + + +/// EnterMacro - Add a Macro to the top of the include stack and start lexing +/// tokens from it instead of the current buffer. +void Preprocessor::EnterMacro(Token &Tok, MacroArgs *Args) { + IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, + CurTokenLexer)); + CurLexer = 0; + CurDirLookup = 0; + + if (NumCachedTokenLexers == 0) { + CurTokenLexer = new TokenLexer(Tok, Args, *this); + } else { + CurTokenLexer = TokenLexerCache[--NumCachedTokenLexers]; + CurTokenLexer->Init(Tok, Args); + } +} + +/// EnterTokenStream - Add a "macro" context to the top of the include stack, +/// which will cause the lexer to start returning the specified tokens. Note +/// that these tokens will be re-macro-expanded when/if expansion is enabled. +/// This method assumes that the specified stream of tokens has a permanent +/// owner somewhere, so they do not need to be copied. +void Preprocessor::EnterTokenStream(const Token *Toks, unsigned NumToks) { + // Save our current state. + IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, + CurTokenLexer)); + CurLexer = 0; + CurDirLookup = 0; + + // Create a macro expander to expand from the specified token stream. + if (NumCachedTokenLexers == 0) { + CurTokenLexer = new TokenLexer(Toks, NumToks, *this); + } else { + CurTokenLexer = TokenLexerCache[--NumCachedTokenLexers]; + CurTokenLexer->Init(Toks, NumToks); + } +} + +/// HandleEndOfFile - This callback is invoked when the lexer hits the end of +/// the current file. This either returns the EOF token or pops a level off +/// the include stack and keeps going. +bool Preprocessor::HandleEndOfFile(Token &Result, bool isEndOfMacro) { + assert(!CurTokenLexer && + "Ending a file when currently in a macro!"); + + // See if this file had a controlling macro. + if (CurLexer) { // Not ending a macro, ignore it. + if (const IdentifierInfo *ControllingMacro = + CurLexer->MIOpt.GetControllingMacroAtEndOfFile()) { + // Okay, this has a controlling macro, remember in PerFileInfo. + if (const FileEntry *FE = + SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) + HeaderInfo.SetFileControllingMacro(FE, ControllingMacro); + } + } + + // If this is a #include'd file, pop it off the include stack and continue + // lexing the #includer file. + if (!IncludeMacroStack.empty()) { + // We're done with the #included file. + RemoveTopOfLexerStack(); + + // Notify the client, if desired, that we are in a new source file. + if (Callbacks && !isEndOfMacro && CurLexer) { + DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir; + + // Get the file entry for the current file. + if (const FileEntry *FE = + SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) + FileType = HeaderInfo.getFileDirFlavor(FE); + + Callbacks->FileChanged(CurLexer->getSourceLocation(CurLexer->BufferPtr), + PPCallbacks::ExitFile, FileType); + } + + // Client should lex another token. + return false; + } + + // If the file ends with a newline, form the EOF token on the newline itself, + // rather than "on the line following it", which doesn't exist. This makes + // diagnostics relating to the end of file include the last file that the user + // actually typed, which is goodness. + const char *EndPos = CurLexer->BufferEnd; + if (EndPos != CurLexer->BufferStart && + (EndPos[-1] == '\n' || EndPos[-1] == '\r')) { + --EndPos; + + // Handle \n\r and \r\n: + if (EndPos != CurLexer->BufferStart && + (EndPos[-1] == '\n' || EndPos[-1] == '\r') && + EndPos[-1] != EndPos[0]) + --EndPos; + } + + Result.startToken(); + CurLexer->BufferPtr = EndPos; + CurLexer->FormTokenWithChars(Result, EndPos); + Result.setKind(tok::eof); + + // We're done with the #included file. + delete CurLexer; + CurLexer = 0; + + // This is the end of the top-level file. If the diag::pp_macro_not_used + // diagnostic is enabled, look for macros that have not been used. + if (Diags.getDiagnosticLevel(diag::pp_macro_not_used) != Diagnostic::Ignored){ + for (llvm::DenseMap::iterator I = + Macros.begin(), E = Macros.end(); I != E; ++I) { + if (!I->second->isUsed()) + Diag(I->second->getDefinitionLoc(), diag::pp_macro_not_used); + } + } + return true; +} + +/// HandleEndOfTokenLexer - This callback is invoked when the current TokenLexer +/// hits the end of its token stream. +bool Preprocessor::HandleEndOfTokenLexer(Token &Result) { + assert(CurTokenLexer && !CurLexer && + "Ending a macro when currently in a #include file!"); + + // Delete or cache the now-dead macro expander. + if (NumCachedTokenLexers == TokenLexerCacheSize) + delete CurTokenLexer; + else + TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer; + + // Handle this like a #include file being popped off the stack. + CurTokenLexer = 0; + return HandleEndOfFile(Result, true); +} + +/// RemoveTopOfLexerStack - Pop the current lexer/macro exp off the top of the +/// lexer stack. This should only be used in situations where the current +/// state of the top-of-stack lexer is unknown. +void Preprocessor::RemoveTopOfLexerStack() { + assert(!IncludeMacroStack.empty() && "Ran out of stack entries to load"); + + if (CurTokenLexer) { + // Delete or cache the now-dead macro expander. + if (NumCachedTokenLexers == TokenLexerCacheSize) + delete CurTokenLexer; + else + TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer; + } else { + delete CurLexer; + } + CurLexer = IncludeMacroStack.back().TheLexer; + CurDirLookup = IncludeMacroStack.back().TheDirLookup; + CurTokenLexer = IncludeMacroStack.back().TheTokenLexer; + IncludeMacroStack.pop_back(); +} + +/// HandleMicrosoftCommentPaste - When the macro expander pastes together a +/// comment (/##/) in microsoft mode, this method handles updating the current +/// state, returning the token on the next source line. +void Preprocessor::HandleMicrosoftCommentPaste(Token &Tok) { + assert(CurTokenLexer && !CurLexer && + "Pasted comment can only be formed from macro"); + + // We handle this by scanning for the closest real lexer, switching it to + // raw mode and preprocessor mode. This will cause it to return \n as an + // explicit EOM token. + Lexer *FoundLexer = 0; + bool LexerWasInPPMode = false; + for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) { + IncludeStackInfo &ISI = *(IncludeMacroStack.end()-i-1); + if (ISI.TheLexer == 0) continue; // Scan for a real lexer. + + // Once we find a real lexer, mark it as raw mode (disabling macro + // expansions) and preprocessor mode (return EOM). We know that the lexer + // was *not* in raw mode before, because the macro that the comment came + // from was expanded. However, it could have already been in preprocessor + // mode (#if COMMENT) in which case we have to return it to that mode and + // return EOM. + FoundLexer = ISI.TheLexer; + FoundLexer->LexingRawMode = true; + LexerWasInPPMode = FoundLexer->ParsingPreprocessorDirective; + FoundLexer->ParsingPreprocessorDirective = true; + break; + } + + // Okay, we either found and switched over the lexer, or we didn't find a + // lexer. In either case, finish off the macro the comment came from, getting + // the next token. + if (!HandleEndOfTokenLexer(Tok)) Lex(Tok); + + // Discarding comments as long as we don't have EOF or EOM. This 'comments + // out' the rest of the line, including any tokens that came from other macros + // that were active, as in: + // #define submacro a COMMENT b + // submacro c + // which should lex to 'a' only: 'b' and 'c' should be removed. + while (Tok.isNot(tok::eom) && Tok.isNot(tok::eof)) + Lex(Tok); + + // If we got an eom token, then we successfully found the end of the line. + if (Tok.is(tok::eom)) { + assert(FoundLexer && "Can't get end of line without an active lexer"); + // Restore the lexer back to normal mode instead of raw mode. + FoundLexer->LexingRawMode = false; + + // If the lexer was already in preprocessor mode, just return the EOM token + // to finish the preprocessor line. + if (LexerWasInPPMode) return; + + // Otherwise, switch out of PP mode and return the next lexed token. + FoundLexer->ParsingPreprocessorDirective = false; + return Lex(Tok); + } + + // If we got an EOF token, then we reached the end of the token stream but + // didn't find an explicit \n. This can only happen if there was no lexer + // active (an active lexer would return EOM at EOF if there was no \n in + // preprocessor directive mode), so just return EOF as our token. + assert(!FoundLexer && "Lexer should return EOM before EOF in PP mode"); +} diff --git a/Lex/Preprocessor.cpp b/Lex/Preprocessor.cpp index f7b1d60fac..79b0d62edb 100644 --- a/Lex/Preprocessor.cpp +++ b/Lex/Preprocessor.cpp @@ -28,7 +28,6 @@ #include "clang/Lex/Preprocessor.h" #include "clang/Lex/HeaderSearch.h" #include "clang/Lex/MacroInfo.h" -#include "clang/Lex/PPCallbacks.h" #include "clang/Lex/Pragma.h" #include "clang/Lex/ScratchBuffer.h" #include "clang/Basic/Diagnostic.h" @@ -112,9 +111,6 @@ Preprocessor::~Preprocessor() { delete ScratchBuf; } -PPCallbacks::~PPCallbacks() { -} - /// Diag - Forwarding function for diagnostics. This emits a diagnostic at /// the specified Token's location, translating the token's start /// position in the current buffer into a SourcePosition object for rendering. @@ -480,194 +476,6 @@ void Preprocessor::EnterMainSourceFile() { EnterSourceFile(FileID, 0); } -//===----------------------------------------------------------------------===// -// Source File Location Methods. -//===----------------------------------------------------------------------===// - -/// LookupFile - Given a "foo" or 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) { - SourceLocation FileLoc = getCurrentFileLexer()->getFileLoc(); - CurFileEnt = SourceMgr.getFileEntryForLoc(FileLoc); - } - - // 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 (CurLexer && !CurLexer->Is_PragmaLexer) { - if ((CurFileEnt = SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc()))) - 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 (ISEntry.TheLexer && !ISEntry.TheLexer->Is_PragmaLexer) { - if ((CurFileEnt = - SourceMgr.getFileEntryForLoc(ISEntry.TheLexer->getFileLoc()))) - if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, - FilenameEnd, CurFileEnt))) - return FE; - } - } - - // Otherwise, we really couldn't find the file. - return 0; -} - -/// isInPrimaryFile - Return true if we're in the top-level file, not in a -/// #include. -bool Preprocessor::isInPrimaryFile() const { - if (CurLexer && !CurLexer->Is_PragmaLexer) - return IncludeMacroStack.empty(); - - // If there are any stacked lexers, we're in a #include. - assert(IncludeMacroStack[0].TheLexer && - !IncludeMacroStack[0].TheLexer->Is_PragmaLexer && - "Top level include stack isn't our primary lexer?"); - for (unsigned i = 1, e = IncludeMacroStack.size(); i != e; ++i) - if (IncludeMacroStack[i].TheLexer && - !IncludeMacroStack[i].TheLexer->Is_PragmaLexer) - return false; - return true; -} - -/// getCurrentLexer - Return the current file lexer being lexed from. Note -/// that this ignores any potentially active macro expansions and _Pragma -/// expansions going on at the time. -Lexer *Preprocessor::getCurrentFileLexer() const { - if (CurLexer && !CurLexer->Is_PragmaLexer) return CurLexer; - - // Look for a stacked lexer. - for (unsigned i = IncludeMacroStack.size(); i != 0; --i) { - Lexer *L = IncludeMacroStack[i-1].TheLexer; - if (L && !L->Is_PragmaLexer) // Ignore macro & _Pragma expansions. - return L; - } - return 0; -} - - -/// EnterSourceFile - Add a source file to the top of the include stack and -/// start lexing tokens from it instead of the current buffer. Return true -/// on failure. -void Preprocessor::EnterSourceFile(unsigned FileID, - const DirectoryLookup *CurDir) { - assert(CurTokenLexer == 0 && "Cannot #include a file inside a macro!"); - ++NumEnteredSourceFiles; - - if (MaxIncludeStackDepth < IncludeMacroStack.size()) - MaxIncludeStackDepth = IncludeMacroStack.size(); - - Lexer *TheLexer = new Lexer(SourceLocation::getFileLoc(FileID, 0), *this); - EnterSourceFileWithLexer(TheLexer, CurDir); -} - -/// EnterSourceFile - Add a source file to the top of the include stack and -/// start lexing tokens from it instead of the current buffer. -void Preprocessor::EnterSourceFileWithLexer(Lexer *TheLexer, - const DirectoryLookup *CurDir) { - - // Add the current lexer to the include stack. - if (CurLexer || CurTokenLexer) - IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, - CurTokenLexer)); - - CurLexer = TheLexer; - CurDirLookup = CurDir; - CurTokenLexer = 0; - - // Notify the client, if desired, that we are in a new source file. - if (Callbacks && !CurLexer->Is_PragmaLexer) { - DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir; - - // Get the file entry for the current file. - if (const FileEntry *FE = - SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) - FileType = HeaderInfo.getFileDirFlavor(FE); - - Callbacks->FileChanged(CurLexer->getFileLoc(), - PPCallbacks::EnterFile, FileType); - } -} - - - -/// EnterMacro - Add a Macro to the top of the include stack and start lexing -/// tokens from it instead of the current buffer. -void Preprocessor::EnterMacro(Token &Tok, MacroArgs *Args) { - IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, - CurTokenLexer)); - CurLexer = 0; - CurDirLookup = 0; - - if (NumCachedTokenLexers == 0) { - CurTokenLexer = new TokenLexer(Tok, Args, *this); - } else { - CurTokenLexer = TokenLexerCache[--NumCachedTokenLexers]; - CurTokenLexer->Init(Tok, Args); - } -} - -/// EnterTokenStream - Add a "macro" context to the top of the include stack, -/// which will cause the lexer to start returning the specified tokens. Note -/// that these tokens will be re-macro-expanded when/if expansion is enabled. -/// This method assumes that the specified stream of tokens has a permanent -/// owner somewhere, so they do not need to be copied. -void Preprocessor::EnterTokenStream(const Token *Toks, unsigned NumToks) { - // Save our current state. - IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, - CurTokenLexer)); - CurLexer = 0; - CurDirLookup = 0; - - // Create a macro expander to expand from the specified token stream. - if (NumCachedTokenLexers == 0) { - CurTokenLexer = new TokenLexer(Toks, NumToks, *this); - } else { - CurTokenLexer = TokenLexerCache[--NumCachedTokenLexers]; - CurTokenLexer->Init(Toks, NumToks); - } -} - -/// RemoveTopOfLexerStack - Pop the current lexer/macro exp off the top of the -/// lexer stack. This should only be used in situations where the current -/// state of the top-of-stack lexer is known. -void Preprocessor::RemoveTopOfLexerStack() { - assert(!IncludeMacroStack.empty() && "Ran out of stack entries to load"); - - if (CurTokenLexer) { - // Delete or cache the now-dead macro expander. - if (NumCachedTokenLexers == TokenLexerCacheSize) - delete CurTokenLexer; - else - TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer; - } else { - delete CurLexer; - } - CurLexer = IncludeMacroStack.back().TheLexer; - CurDirLookup = IncludeMacroStack.back().TheDirLookup; - CurTokenLexer = IncludeMacroStack.back().TheTokenLexer; - IncludeMacroStack.pop_back(); -} - //===----------------------------------------------------------------------===// // Lexer Event Handling. @@ -748,164 +556,3 @@ void Preprocessor::HandleIdentifier(Token &Identifier) { Diag(Identifier, diag::ext_token_used); } -/// HandleEndOfFile - This callback is invoked when the lexer hits the end of -/// the current file. This either returns the EOF token or pops a level off -/// the include stack and keeps going. -bool Preprocessor::HandleEndOfFile(Token &Result, bool isEndOfMacro) { - assert(!CurTokenLexer && - "Ending a file when currently in a macro!"); - - // See if this file had a controlling macro. - if (CurLexer) { // Not ending a macro, ignore it. - if (const IdentifierInfo *ControllingMacro = - CurLexer->MIOpt.GetControllingMacroAtEndOfFile()) { - // Okay, this has a controlling macro, remember in PerFileInfo. - if (const FileEntry *FE = - SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) - HeaderInfo.SetFileControllingMacro(FE, ControllingMacro); - } - } - - // If this is a #include'd file, pop it off the include stack and continue - // lexing the #includer file. - if (!IncludeMacroStack.empty()) { - // We're done with the #included file. - RemoveTopOfLexerStack(); - - // Notify the client, if desired, that we are in a new source file. - if (Callbacks && !isEndOfMacro && CurLexer) { - DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir; - - // Get the file entry for the current file. - if (const FileEntry *FE = - SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) - FileType = HeaderInfo.getFileDirFlavor(FE); - - Callbacks->FileChanged(CurLexer->getSourceLocation(CurLexer->BufferPtr), - PPCallbacks::ExitFile, FileType); - } - - // Client should lex another token. - return false; - } - - // If the file ends with a newline, form the EOF token on the newline itself, - // rather than "on the line following it", which doesn't exist. This makes - // diagnostics relating to the end of file include the last file that the user - // actually typed, which is goodness. - const char *EndPos = CurLexer->BufferEnd; - if (EndPos != CurLexer->BufferStart && - (EndPos[-1] == '\n' || EndPos[-1] == '\r')) { - --EndPos; - - // Handle \n\r and \r\n: - if (EndPos != CurLexer->BufferStart && - (EndPos[-1] == '\n' || EndPos[-1] == '\r') && - EndPos[-1] != EndPos[0]) - --EndPos; - } - - Result.startToken(); - CurLexer->BufferPtr = EndPos; - CurLexer->FormTokenWithChars(Result, EndPos); - Result.setKind(tok::eof); - - // We're done with the #included file. - delete CurLexer; - CurLexer = 0; - - // This is the end of the top-level file. If the diag::pp_macro_not_used - // diagnostic is enabled, look for macros that have not been used. - if (Diags.getDiagnosticLevel(diag::pp_macro_not_used) != Diagnostic::Ignored){ - for (llvm::DenseMap::iterator I = - Macros.begin(), E = Macros.end(); I != E; ++I) { - if (!I->second->isUsed()) - Diag(I->second->getDefinitionLoc(), diag::pp_macro_not_used); - } - } - return true; -} - -/// HandleEndOfTokenLexer - This callback is invoked when the current TokenLexer -/// hits the end of its token stream. -bool Preprocessor::HandleEndOfTokenLexer(Token &Result) { - assert(CurTokenLexer && !CurLexer && - "Ending a macro when currently in a #include file!"); - - // Delete or cache the now-dead macro expander. - if (NumCachedTokenLexers == TokenLexerCacheSize) - delete CurTokenLexer; - else - TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer; - - // Handle this like a #include file being popped off the stack. - CurTokenLexer = 0; - return HandleEndOfFile(Result, true); -} - -/// HandleMicrosoftCommentPaste - When the macro expander pastes together a -/// comment (/##/) in microsoft mode, this method handles updating the current -/// state, returning the token on the next source line. -void Preprocessor::HandleMicrosoftCommentPaste(Token &Tok) { - assert(CurTokenLexer && !CurLexer && - "Pasted comment can only be formed from macro"); - - // We handle this by scanning for the closest real lexer, switching it to - // raw mode and preprocessor mode. This will cause it to return \n as an - // explicit EOM token. - Lexer *FoundLexer = 0; - bool LexerWasInPPMode = false; - for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) { - IncludeStackInfo &ISI = *(IncludeMacroStack.end()-i-1); - if (ISI.TheLexer == 0) continue; // Scan for a real lexer. - - // Once we find a real lexer, mark it as raw mode (disabling macro - // expansions) and preprocessor mode (return EOM). We know that the lexer - // was *not* in raw mode before, because the macro that the comment came - // from was expanded. However, it could have already been in preprocessor - // mode (#if COMMENT) in which case we have to return it to that mode and - // return EOM. - FoundLexer = ISI.TheLexer; - FoundLexer->LexingRawMode = true; - LexerWasInPPMode = FoundLexer->ParsingPreprocessorDirective; - FoundLexer->ParsingPreprocessorDirective = true; - break; - } - - // Okay, we either found and switched over the lexer, or we didn't find a - // lexer. In either case, finish off the macro the comment came from, getting - // the next token. - if (!HandleEndOfTokenLexer(Tok)) Lex(Tok); - - // Discarding comments as long as we don't have EOF or EOM. This 'comments - // out' the rest of the line, including any tokens that came from other macros - // that were active, as in: - // #define submacro a COMMENT b - // submacro c - // which should lex to 'a' only: 'b' and 'c' should be removed. - while (Tok.isNot(tok::eom) && Tok.isNot(tok::eof)) - Lex(Tok); - - // If we got an eom token, then we successfully found the end of the line. - if (Tok.is(tok::eom)) { - assert(FoundLexer && "Can't get end of line without an active lexer"); - // Restore the lexer back to normal mode instead of raw mode. - FoundLexer->LexingRawMode = false; - - // If the lexer was already in preprocessor mode, just return the EOM token - // to finish the preprocessor line. - if (LexerWasInPPMode) return; - - // Otherwise, switch out of PP mode and return the next lexed token. - FoundLexer->ParsingPreprocessorDirective = false; - return Lex(Tok); - } - - // If we got an EOF token, then we reached the end of the token stream but - // didn't find an explicit \n. This can only happen if there was no lexer - // active (an active lexer would return EOM at EOF if there was no \n in - // preprocessor directive mode), so just return EOF as our token. - assert(!FoundLexer && "Lexer should return EOM before EOF in PP mode"); - return; -} - -- 2.50.1