forked from OSchip/llvm-project
Move a bunch more code out of Preprocessor.cpp into PPLexerChange.cpp
llvm-svn: 48080
This commit is contained in:
Chris Lattner
parent
03ab156041
commit
1eed734c9c
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@ -0,0 +1,373 @@
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//===--- PPLexerChange.cpp - Handle changing lexers in the preprocessor ---===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements pieces of the Preprocessor interface that manage the
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// current lexer stack.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/MacroInfo.h"
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#include "clang/Lex/PPCallbacks.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/SourceManager.h"
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using namespace clang;
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PPCallbacks::~PPCallbacks() {
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}
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//===----------------------------------------------------------------------===//
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// Source File Location Methods.
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//===----------------------------------------------------------------------===//
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/// LookupFile - Given a "foo" or <foo> reference, look up the indicated file,
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/// return null on failure. isAngled indicates whether the file reference is
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/// for system #include's or not (i.e. using <> instead of "").
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const FileEntry *Preprocessor::LookupFile(const char *FilenameStart,
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const char *FilenameEnd,
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bool isAngled,
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const DirectoryLookup *FromDir,
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const DirectoryLookup *&CurDir) {
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// If the header lookup mechanism may be relative to the current file, pass in
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// info about where the current file is.
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const FileEntry *CurFileEnt = 0;
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if (!FromDir) {
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SourceLocation FileLoc = getCurrentFileLexer()->getFileLoc();
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CurFileEnt = SourceMgr.getFileEntryForLoc(FileLoc);
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}
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// Do a standard file entry lookup.
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CurDir = CurDirLookup;
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const FileEntry *FE =
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HeaderInfo.LookupFile(FilenameStart, FilenameEnd,
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isAngled, FromDir, CurDir, CurFileEnt);
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if (FE) return FE;
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// Otherwise, see if this is a subframework header. If so, this is relative
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// to one of the headers on the #include stack. Walk the list of the current
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// headers on the #include stack and pass them to HeaderInfo.
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if (CurLexer && !CurLexer->Is_PragmaLexer) {
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if ((CurFileEnt = SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())))
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if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, FilenameEnd,
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CurFileEnt)))
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return FE;
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}
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for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
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IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1];
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if (ISEntry.TheLexer && !ISEntry.TheLexer->Is_PragmaLexer) {
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if ((CurFileEnt =
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SourceMgr.getFileEntryForLoc(ISEntry.TheLexer->getFileLoc())))
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if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart,
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FilenameEnd, CurFileEnt)))
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return FE;
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}
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}
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// Otherwise, we really couldn't find the file.
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return 0;
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}
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/// isInPrimaryFile - Return true if we're in the top-level file, not in a
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/// #include.
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bool Preprocessor::isInPrimaryFile() const {
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if (CurLexer && !CurLexer->Is_PragmaLexer)
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return IncludeMacroStack.empty();
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// If there are any stacked lexers, we're in a #include.
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assert(IncludeMacroStack[0].TheLexer &&
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!IncludeMacroStack[0].TheLexer->Is_PragmaLexer &&
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"Top level include stack isn't our primary lexer?");
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for (unsigned i = 1, e = IncludeMacroStack.size(); i != e; ++i)
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if (IncludeMacroStack[i].TheLexer &&
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!IncludeMacroStack[i].TheLexer->Is_PragmaLexer)
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return false;
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return true;
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}
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/// getCurrentLexer - Return the current file lexer being lexed from. Note
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/// that this ignores any potentially active macro expansions and _Pragma
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/// expansions going on at the time.
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Lexer *Preprocessor::getCurrentFileLexer() const {
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if (CurLexer && !CurLexer->Is_PragmaLexer) return CurLexer;
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// Look for a stacked lexer.
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for (unsigned i = IncludeMacroStack.size(); i != 0; --i) {
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Lexer *L = IncludeMacroStack[i-1].TheLexer;
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if (L && !L->Is_PragmaLexer) // Ignore macro & _Pragma expansions.
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return L;
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}
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return 0;
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}
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/// EnterSourceFile - Add a source file to the top of the include stack and
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/// start lexing tokens from it instead of the current buffer. Return true
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/// on failure.
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void Preprocessor::EnterSourceFile(unsigned FileID,
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const DirectoryLookup *CurDir) {
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assert(CurTokenLexer == 0 && "Cannot #include a file inside a macro!");
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++NumEnteredSourceFiles;
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if (MaxIncludeStackDepth < IncludeMacroStack.size())
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MaxIncludeStackDepth = IncludeMacroStack.size();
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Lexer *TheLexer = new Lexer(SourceLocation::getFileLoc(FileID, 0), *this);
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EnterSourceFileWithLexer(TheLexer, CurDir);
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}
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/// EnterSourceFile - Add a source file to the top of the include stack and
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/// start lexing tokens from it instead of the current buffer.
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void Preprocessor::EnterSourceFileWithLexer(Lexer *TheLexer,
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const DirectoryLookup *CurDir) {
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// Add the current lexer to the include stack.
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if (CurLexer || CurTokenLexer)
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IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup,
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CurTokenLexer));
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CurLexer = TheLexer;
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CurDirLookup = CurDir;
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CurTokenLexer = 0;
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// Notify the client, if desired, that we are in a new source file.
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if (Callbacks && !CurLexer->Is_PragmaLexer) {
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DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir;
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// Get the file entry for the current file.
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if (const FileEntry *FE =
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SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc()))
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FileType = HeaderInfo.getFileDirFlavor(FE);
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Callbacks->FileChanged(CurLexer->getFileLoc(),
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PPCallbacks::EnterFile, FileType);
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}
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}
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/// EnterMacro - Add a Macro to the top of the include stack and start lexing
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/// tokens from it instead of the current buffer.
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void Preprocessor::EnterMacro(Token &Tok, MacroArgs *Args) {
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IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup,
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CurTokenLexer));
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CurLexer = 0;
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CurDirLookup = 0;
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if (NumCachedTokenLexers == 0) {
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CurTokenLexer = new TokenLexer(Tok, Args, *this);
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} else {
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CurTokenLexer = TokenLexerCache[--NumCachedTokenLexers];
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CurTokenLexer->Init(Tok, Args);
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}
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}
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/// EnterTokenStream - Add a "macro" context to the top of the include stack,
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/// which will cause the lexer to start returning the specified tokens. Note
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/// that these tokens will be re-macro-expanded when/if expansion is enabled.
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/// This method assumes that the specified stream of tokens has a permanent
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/// owner somewhere, so they do not need to be copied.
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void Preprocessor::EnterTokenStream(const Token *Toks, unsigned NumToks) {
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// Save our current state.
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IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup,
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CurTokenLexer));
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CurLexer = 0;
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CurDirLookup = 0;
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// Create a macro expander to expand from the specified token stream.
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if (NumCachedTokenLexers == 0) {
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CurTokenLexer = new TokenLexer(Toks, NumToks, *this);
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} else {
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CurTokenLexer = TokenLexerCache[--NumCachedTokenLexers];
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CurTokenLexer->Init(Toks, NumToks);
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}
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}
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/// HandleEndOfFile - This callback is invoked when the lexer hits the end of
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/// the current file. This either returns the EOF token or pops a level off
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/// the include stack and keeps going.
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bool Preprocessor::HandleEndOfFile(Token &Result, bool isEndOfMacro) {
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assert(!CurTokenLexer &&
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"Ending a file when currently in a macro!");
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// See if this file had a controlling macro.
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if (CurLexer) { // Not ending a macro, ignore it.
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if (const IdentifierInfo *ControllingMacro =
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CurLexer->MIOpt.GetControllingMacroAtEndOfFile()) {
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// Okay, this has a controlling macro, remember in PerFileInfo.
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if (const FileEntry *FE =
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SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc()))
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HeaderInfo.SetFileControllingMacro(FE, ControllingMacro);
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}
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}
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// If this is a #include'd file, pop it off the include stack and continue
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// lexing the #includer file.
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if (!IncludeMacroStack.empty()) {
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// We're done with the #included file.
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RemoveTopOfLexerStack();
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// Notify the client, if desired, that we are in a new source file.
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if (Callbacks && !isEndOfMacro && CurLexer) {
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DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir;
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// Get the file entry for the current file.
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if (const FileEntry *FE =
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SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc()))
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FileType = HeaderInfo.getFileDirFlavor(FE);
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Callbacks->FileChanged(CurLexer->getSourceLocation(CurLexer->BufferPtr),
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PPCallbacks::ExitFile, FileType);
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}
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// Client should lex another token.
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return false;
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}
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// If the file ends with a newline, form the EOF token on the newline itself,
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// rather than "on the line following it", which doesn't exist. This makes
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// diagnostics relating to the end of file include the last file that the user
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// actually typed, which is goodness.
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const char *EndPos = CurLexer->BufferEnd;
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if (EndPos != CurLexer->BufferStart &&
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(EndPos[-1] == '\n' || EndPos[-1] == '\r')) {
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--EndPos;
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// Handle \n\r and \r\n:
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if (EndPos != CurLexer->BufferStart &&
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(EndPos[-1] == '\n' || EndPos[-1] == '\r') &&
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EndPos[-1] != EndPos[0])
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--EndPos;
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}
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Result.startToken();
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CurLexer->BufferPtr = EndPos;
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CurLexer->FormTokenWithChars(Result, EndPos);
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Result.setKind(tok::eof);
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// We're done with the #included file.
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delete CurLexer;
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CurLexer = 0;
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// This is the end of the top-level file. If the diag::pp_macro_not_used
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// diagnostic is enabled, look for macros that have not been used.
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if (Diags.getDiagnosticLevel(diag::pp_macro_not_used) != Diagnostic::Ignored){
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for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I =
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Macros.begin(), E = Macros.end(); I != E; ++I) {
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if (!I->second->isUsed())
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Diag(I->second->getDefinitionLoc(), diag::pp_macro_not_used);
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}
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}
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return true;
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}
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/// HandleEndOfTokenLexer - This callback is invoked when the current TokenLexer
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/// hits the end of its token stream.
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bool Preprocessor::HandleEndOfTokenLexer(Token &Result) {
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assert(CurTokenLexer && !CurLexer &&
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"Ending a macro when currently in a #include file!");
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// Delete or cache the now-dead macro expander.
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if (NumCachedTokenLexers == TokenLexerCacheSize)
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delete CurTokenLexer;
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else
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TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer;
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// Handle this like a #include file being popped off the stack.
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CurTokenLexer = 0;
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return HandleEndOfFile(Result, true);
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}
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/// RemoveTopOfLexerStack - Pop the current lexer/macro exp off the top of the
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/// lexer stack. This should only be used in situations where the current
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/// state of the top-of-stack lexer is unknown.
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void Preprocessor::RemoveTopOfLexerStack() {
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assert(!IncludeMacroStack.empty() && "Ran out of stack entries to load");
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if (CurTokenLexer) {
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// Delete or cache the now-dead macro expander.
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if (NumCachedTokenLexers == TokenLexerCacheSize)
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delete CurTokenLexer;
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else
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TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer;
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} else {
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delete CurLexer;
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}
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CurLexer = IncludeMacroStack.back().TheLexer;
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CurDirLookup = IncludeMacroStack.back().TheDirLookup;
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CurTokenLexer = IncludeMacroStack.back().TheTokenLexer;
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IncludeMacroStack.pop_back();
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}
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/// HandleMicrosoftCommentPaste - When the macro expander pastes together a
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/// comment (/##/) in microsoft mode, this method handles updating the current
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/// state, returning the token on the next source line.
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void Preprocessor::HandleMicrosoftCommentPaste(Token &Tok) {
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assert(CurTokenLexer && !CurLexer &&
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"Pasted comment can only be formed from macro");
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// We handle this by scanning for the closest real lexer, switching it to
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// raw mode and preprocessor mode. This will cause it to return \n as an
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// explicit EOM token.
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Lexer *FoundLexer = 0;
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bool LexerWasInPPMode = false;
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for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
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IncludeStackInfo &ISI = *(IncludeMacroStack.end()-i-1);
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if (ISI.TheLexer == 0) continue; // Scan for a real lexer.
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// Once we find a real lexer, mark it as raw mode (disabling macro
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// expansions) and preprocessor mode (return EOM). We know that the lexer
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// was *not* in raw mode before, because the macro that the comment came
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// from was expanded. However, it could have already been in preprocessor
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// mode (#if COMMENT) in which case we have to return it to that mode and
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// return EOM.
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FoundLexer = ISI.TheLexer;
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FoundLexer->LexingRawMode = true;
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LexerWasInPPMode = FoundLexer->ParsingPreprocessorDirective;
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FoundLexer->ParsingPreprocessorDirective = true;
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break;
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}
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// Okay, we either found and switched over the lexer, or we didn't find a
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// lexer. In either case, finish off the macro the comment came from, getting
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// the next token.
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if (!HandleEndOfTokenLexer(Tok)) Lex(Tok);
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// Discarding comments as long as we don't have EOF or EOM. This 'comments
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// out' the rest of the line, including any tokens that came from other macros
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// that were active, as in:
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// #define submacro a COMMENT b
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// submacro c
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// which should lex to 'a' only: 'b' and 'c' should be removed.
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while (Tok.isNot(tok::eom) && Tok.isNot(tok::eof))
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Lex(Tok);
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// If we got an eom token, then we successfully found the end of the line.
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if (Tok.is(tok::eom)) {
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assert(FoundLexer && "Can't get end of line without an active lexer");
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// Restore the lexer back to normal mode instead of raw mode.
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FoundLexer->LexingRawMode = false;
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// If the lexer was already in preprocessor mode, just return the EOM token
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// to finish the preprocessor line.
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if (LexerWasInPPMode) return;
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// Otherwise, switch out of PP mode and return the next lexed token.
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FoundLexer->ParsingPreprocessorDirective = false;
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return Lex(Tok);
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}
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// If we got an EOF token, then we reached the end of the token stream but
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// didn't find an explicit \n. This can only happen if there was no lexer
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// active (an active lexer would return EOM at EOF if there was no \n in
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// preprocessor directive mode), so just return EOF as our token.
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assert(!FoundLexer && "Lexer should return EOM before EOF in PP mode");
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}
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@ -28,7 +28,6 @@
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/MacroInfo.h"
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#include "clang/Lex/PPCallbacks.h"
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#include "clang/Lex/Pragma.h"
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#include "clang/Lex/ScratchBuffer.h"
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#include "clang/Basic/Diagnostic.h"
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@ -112,9 +111,6 @@ Preprocessor::~Preprocessor() {
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delete ScratchBuf;
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}
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PPCallbacks::~PPCallbacks() {
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}
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/// Diag - Forwarding function for diagnostics. This emits a diagnostic at
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/// the specified Token's location, translating the token's start
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/// position in the current buffer into a SourcePosition object for rendering.
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@ -480,194 +476,6 @@ void Preprocessor::EnterMainSourceFile() {
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EnterSourceFile(FileID, 0);
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}
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//===----------------------------------------------------------------------===//
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// Source File Location Methods.
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//===----------------------------------------------------------------------===//
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/// LookupFile - Given a "foo" or <foo> reference, look up the indicated file,
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/// return null on failure. isAngled indicates whether the file reference is
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/// for system #include's or not (i.e. using <> instead of "").
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const FileEntry *Preprocessor::LookupFile(const char *FilenameStart,
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const char *FilenameEnd,
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bool isAngled,
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const DirectoryLookup *FromDir,
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const DirectoryLookup *&CurDir) {
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// If the header lookup mechanism may be relative to the current file, pass in
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// info about where the current file is.
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const FileEntry *CurFileEnt = 0;
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if (!FromDir) {
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SourceLocation FileLoc = getCurrentFileLexer()->getFileLoc();
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CurFileEnt = SourceMgr.getFileEntryForLoc(FileLoc);
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}
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// Do a standard file entry lookup.
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CurDir = CurDirLookup;
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const FileEntry *FE =
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HeaderInfo.LookupFile(FilenameStart, FilenameEnd,
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isAngled, FromDir, CurDir, CurFileEnt);
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if (FE) return FE;
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// Otherwise, see if this is a subframework header. If so, this is relative
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// to one of the headers on the #include stack. Walk the list of the current
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// headers on the #include stack and pass them to HeaderInfo.
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if (CurLexer && !CurLexer->Is_PragmaLexer) {
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if ((CurFileEnt = SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())))
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if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, FilenameEnd,
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CurFileEnt)))
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return FE;
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}
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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<IdentifierInfo*, MacroInfo*>::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;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue