2008-03-09 12:10:46 +08:00
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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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2009-01-29 13:15:15 +08:00
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#include "clang/Lex/LexDiagnostic.h"
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2008-03-09 12:10:46 +08:00
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#include "clang/Basic/SourceManager.h"
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2008-11-20 15:56:33 +08:00
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#include "llvm/Support/MemoryBuffer.h"
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2008-03-09 12:10:46 +08:00
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using namespace clang;
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2008-11-18 09:33:13 +08:00
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PPCallbacks::~PPCallbacks() {}
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2008-03-09 12:10:46 +08:00
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//===----------------------------------------------------------------------===//
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2008-03-10 14:06:04 +08:00
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// Miscellaneous Methods.
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2008-03-09 12:10:46 +08:00
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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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2008-03-09 12:49:35 +08:00
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/// #include. This looks through macro expansions and active _Pragma lexers.
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2008-03-09 12:10:46 +08:00
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bool Preprocessor::isInPrimaryFile() const {
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2008-11-21 00:19:53 +08:00
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if (IsFileLexer())
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2008-03-09 12:10:46 +08:00
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return IncludeMacroStack.empty();
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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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// If there are any stacked lexers, we're in a #include.
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2008-11-21 00:19:53 +08:00
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assert(IsFileLexer(IncludeMacroStack[0]) &&
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2008-03-09 12:10:46 +08:00
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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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2008-11-21 00:19:53 +08:00
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if (IsFileLexer(IncludeMacroStack[i]))
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2008-03-09 12:10:46 +08:00
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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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2008-11-20 09:49:44 +08:00
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PreprocessorLexer *Preprocessor::getCurrentFileLexer() const {
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2008-11-21 00:19:53 +08:00
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if (IsFileLexer())
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2008-11-20 09:49:44 +08:00
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return CurPPLexer;
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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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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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2008-11-20 09:49:44 +08:00
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const IncludeStackInfo& ISI = IncludeMacroStack[i-1];
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2008-11-21 00:19:53 +08:00
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if (IsFileLexer(ISI))
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2008-11-20 09:49:44 +08:00
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return ISI.ThePPLexer;
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2008-03-09 12:10:46 +08:00
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}
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return 0;
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}
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2008-03-10 14:06:04 +08:00
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//===----------------------------------------------------------------------===//
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// Methods for Entering and Callbacks for leaving various contexts
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//===----------------------------------------------------------------------===//
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2008-03-09 12:10:46 +08:00
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/// EnterSourceFile - Add a source file to the top of the include stack and
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2009-11-30 01:07:16 +08:00
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/// start lexing tokens from it instead of the current buffer.
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2010-04-21 04:35:58 +08:00
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void Preprocessor::EnterSourceFile(FileID FID, const DirectoryLookup *CurDir,
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SourceLocation Loc) {
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2008-03-09 12:10:46 +08:00
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assert(CurTokenLexer == 0 && "Cannot #include a file inside a macro!");
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++NumEnteredSourceFiles;
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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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if (MaxIncludeStackDepth < IncludeMacroStack.size())
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MaxIncludeStackDepth = IncludeMacroStack.size();
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2008-12-03 03:46:31 +08:00
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if (PTH) {
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2009-11-30 12:18:44 +08:00
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if (PTHLexer *PL = PTH->CreateLexer(FID)) {
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EnterSourceFileWithPTH(PL, CurDir);
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2010-04-21 04:35:58 +08:00
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return;
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2009-11-30 12:18:44 +08:00
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}
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2008-12-03 03:46:31 +08:00
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}
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2009-11-30 12:18:44 +08:00
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// Get the MemoryBuffer for this FID, if it fails, we fail.
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2010-03-17 04:01:30 +08:00
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bool Invalid = false;
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2010-04-21 04:35:58 +08:00
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const llvm::MemoryBuffer *InputFile =
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getSourceManager().getBuffer(FID, Loc, &Invalid);
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if (Invalid) {
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SourceLocation FileStart = SourceMgr.getLocForStartOfFile(FID);
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Diag(Loc, diag::err_pp_error_opening_file)
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<< std::string(SourceMgr.getBufferName(FileStart)) << "";
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return;
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}
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2011-09-04 11:32:15 +08:00
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if (isCodeCompletionEnabled() &&
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SourceMgr.getFileEntryForID(FID) == CodeCompletionFile) {
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CodeCompletionFileLoc = SourceMgr.getLocForStartOfFile(FID);
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CodeCompletionLoc =
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2011-09-20 04:40:19 +08:00
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CodeCompletionFileLoc.getLocWithOffset(CodeCompletionOffset);
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2011-09-04 11:32:15 +08:00
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}
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2009-11-30 12:18:44 +08:00
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EnterSourceFileWithLexer(new Lexer(FID, InputFile, *this), CurDir);
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2010-04-21 04:35:58 +08:00
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return;
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2009-09-09 23:08:12 +08:00
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}
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2008-09-27 04:12:23 +08:00
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2008-12-03 03:46:31 +08:00
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/// EnterSourceFileWithLexer - Add a source file to the top of the include stack
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/// and start lexing tokens from it instead of the current buffer.
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2009-09-09 23:08:12 +08:00
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void Preprocessor::EnterSourceFileWithLexer(Lexer *TheLexer,
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2008-03-09 12:10:46 +08:00
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const DirectoryLookup *CurDir) {
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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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// Add the current lexer to the include stack.
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2008-11-20 05:57:25 +08:00
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if (CurPPLexer || CurTokenLexer)
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2008-11-14 00:51:03 +08:00
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PushIncludeMacroStack();
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2008-11-14 01:11:24 +08:00
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CurLexer.reset(TheLexer);
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2008-11-18 08:12:49 +08:00
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CurPPLexer = TheLexer;
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2008-03-09 12:10:46 +08:00
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CurDirLookup = CurDir;
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2011-09-08 07:11:54 +08:00
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_Lexer;
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2008-03-09 12:10:46 +08:00
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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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2008-10-27 09:19:25 +08:00
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SrcMgr::CharacteristicKind FileType =
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2008-09-27 05:18:42 +08:00
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SourceMgr.getFileCharacteristic(CurLexer->getFileLoc());
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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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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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2008-12-03 03:46:31 +08:00
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/// EnterSourceFileWithPTH - Add a source file to the top of the include stack
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/// and start getting tokens from it using the PTH cache.
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2009-09-09 23:08:12 +08:00
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void Preprocessor::EnterSourceFileWithPTH(PTHLexer *PL,
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2008-12-03 03:46:31 +08:00
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const DirectoryLookup *CurDir) {
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2009-09-09 23:08:12 +08:00
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2008-12-03 03:46:31 +08:00
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if (CurPPLexer || CurTokenLexer)
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PushIncludeMacroStack();
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2008-03-09 12:10:46 +08:00
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2008-12-03 03:46:31 +08:00
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CurDirLookup = CurDir;
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CurPTHLexer.reset(PL);
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CurPPLexer = CurPTHLexer.get();
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2011-09-08 07:11:54 +08:00
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_PTHLexer;
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2008-12-03 03:46:31 +08:00
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// Notify the client, if desired, that we are in a new source file.
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if (Callbacks) {
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2009-01-17 14:22:33 +08:00
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FileID FID = CurPPLexer->getFileID();
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2009-01-19 16:01:53 +08:00
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SourceLocation EnterLoc = SourceMgr.getLocForStartOfFile(FID);
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SrcMgr::CharacteristicKind FileType =
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SourceMgr.getFileCharacteristic(EnterLoc);
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Callbacks->FileChanged(EnterLoc, PPCallbacks::EnterFile, FileType);
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2008-12-03 03:46:31 +08:00
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}
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}
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2008-03-09 12:10:46 +08:00
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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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2009-02-16 04:52:18 +08:00
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void Preprocessor::EnterMacro(Token &Tok, SourceLocation ILEnd,
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MacroArgs *Args) {
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2008-11-14 00:51:03 +08:00
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PushIncludeMacroStack();
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2008-03-09 12:10:46 +08:00
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CurDirLookup = 0;
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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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if (NumCachedTokenLexers == 0) {
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2009-02-16 04:52:18 +08:00
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CurTokenLexer.reset(new TokenLexer(Tok, ILEnd, Args, *this));
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2008-03-09 12:10:46 +08:00
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} else {
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2008-11-14 01:11:24 +08:00
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CurTokenLexer.reset(TokenLexerCache[--NumCachedTokenLexers]);
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2009-02-16 04:52:18 +08:00
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CurTokenLexer->Init(Tok, ILEnd, Args);
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2008-03-09 12:10:46 +08:00
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}
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2011-09-08 07:11:54 +08:00
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_TokenLexer;
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2008-03-09 12:10:46 +08:00
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}
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/// EnterTokenStream - Add a "macro" context to the top of the include stack,
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2008-03-10 14:06:04 +08:00
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/// which will cause the lexer to start returning the specified tokens.
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///
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/// If DisableMacroExpansion is true, tokens lexed from the token stream will
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/// not be subject to further macro expansion. Otherwise, these tokens will
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/// be re-macro-expanded when/if expansion is enabled.
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///
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/// If OwnsTokens is false, this method assumes that the specified stream of
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/// tokens has a permanent owner somewhere, so they do not need to be copied.
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/// If it is true, it assumes the array of tokens is allocated with new[] and
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/// must be freed.
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///
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void Preprocessor::EnterTokenStream(const Token *Toks, unsigned NumToks,
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bool DisableMacroExpansion,
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bool OwnsTokens) {
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2008-03-09 12:10:46 +08:00
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// Save our current state.
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2008-11-14 00:51:03 +08:00
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PushIncludeMacroStack();
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2008-03-09 12:10:46 +08:00
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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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2008-11-14 01:11:24 +08:00
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CurTokenLexer.reset(new TokenLexer(Toks, NumToks, DisableMacroExpansion,
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OwnsTokens, *this));
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2008-03-09 12:10:46 +08:00
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} else {
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2008-11-14 01:11:24 +08:00
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CurTokenLexer.reset(TokenLexerCache[--NumCachedTokenLexers]);
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2008-03-10 14:06:04 +08:00
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CurTokenLexer->Init(Toks, NumToks, DisableMacroExpansion, OwnsTokens);
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2008-03-09 12:10:46 +08:00
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}
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2011-09-08 07:11:54 +08:00
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_TokenLexer;
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2008-03-09 12:10:46 +08:00
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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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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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// See if this file had a controlling macro.
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2008-11-20 06:43:49 +08:00
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if (CurPPLexer) { // Not ending a macro, ignore it.
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2009-09-09 23:08:12 +08:00
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if (const IdentifierInfo *ControllingMacro =
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2008-11-20 06:43:49 +08:00
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CurPPLexer->MIOpt.GetControllingMacroAtEndOfFile()) {
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2009-04-25 04:03:17 +08:00
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// Okay, this has a controlling macro, remember in HeaderFileInfo.
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2009-09-09 23:08:12 +08:00
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if (const FileEntry *FE =
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2008-11-20 06:43:49 +08:00
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SourceMgr.getFileEntryForID(CurPPLexer->getFileID()))
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2008-03-09 12:10:46 +08:00
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HeaderInfo.SetFileControllingMacro(FE, ControllingMacro);
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}
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}
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2009-09-09 23:08:12 +08:00
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2008-03-09 12:10:46 +08:00
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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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2011-09-04 11:32:15 +08:00
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// If we lexed the code-completion file, act as if we reached EOF.
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if (isCodeCompletionEnabled() && CurPPLexer &&
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SourceMgr.getLocForStartOfFile(CurPPLexer->getFileID()) ==
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CodeCompletionFileLoc) {
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if (CurLexer) {
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Result.startToken();
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CurLexer->FormTokenWithChars(Result, CurLexer->BufferEnd, tok::eof);
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CurLexer.reset();
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} else {
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assert(CurPTHLexer && "Got EOF but no current lexer set!");
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CurPTHLexer->getEOF(Result);
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CurPTHLexer.reset();
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}
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CurPPLexer = 0;
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return true;
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}
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2011-08-22 07:33:04 +08:00
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if (!isEndOfMacro && CurPPLexer &&
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SourceMgr.getIncludeLoc(CurPPLexer->getFileID()).isValid()) {
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// Notify SourceManager to record the number of FileIDs that were created
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// during lexing of the #include'd file.
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unsigned NumFIDs =
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SourceMgr.local_sloc_entry_size() -
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CurPPLexer->getInitialNumSLocEntries() + 1/*#include'd file*/;
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SourceMgr.setNumCreatedFIDsForFileID(CurPPLexer->getFileID(), NumFIDs);
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}
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2008-03-09 12:10:46 +08:00
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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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2008-11-20 06:43:49 +08:00
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if (Callbacks && !isEndOfMacro && CurPPLexer) {
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2008-10-27 09:19:25 +08:00
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SrcMgr::CharacteristicKind FileType =
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2009-01-19 16:01:53 +08:00
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SourceMgr.getFileCharacteristic(CurPPLexer->getSourceLocation());
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Callbacks->FileChanged(CurPPLexer->getSourceLocation(),
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2009-09-09 23:08:12 +08:00
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PPCallbacks::ExitFile, FileType);
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2008-03-09 12:10:46 +08:00
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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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2008-11-20 06:43:49 +08:00
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if (CurLexer) {
|
|
|
|
const char *EndPos = CurLexer->BufferEnd;
|
2009-09-09 23:08:12 +08:00
|
|
|
if (EndPos != CurLexer->BufferStart &&
|
2008-11-20 06:43:49 +08:00
|
|
|
(EndPos[-1] == '\n' || EndPos[-1] == '\r')) {
|
2008-03-09 12:10:46 +08:00
|
|
|
--EndPos;
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-11-20 06:43:49 +08:00
|
|
|
// Handle \n\r and \r\n:
|
2009-09-09 23:08:12 +08:00
|
|
|
if (EndPos != CurLexer->BufferStart &&
|
2008-11-20 06:43:49 +08:00
|
|
|
(EndPos[-1] == '\n' || EndPos[-1] == '\r') &&
|
|
|
|
EndPos[-1] != EndPos[0])
|
|
|
|
--EndPos;
|
|
|
|
}
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-11-20 06:43:49 +08:00
|
|
|
Result.startToken();
|
|
|
|
CurLexer->BufferPtr = EndPos;
|
|
|
|
CurLexer->FormTokenWithChars(Result, EndPos, tok::eof);
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-11-20 06:43:49 +08:00
|
|
|
// We're done with the #included file.
|
|
|
|
CurLexer.reset();
|
2009-02-14 07:06:48 +08:00
|
|
|
} else {
|
|
|
|
assert(CurPTHLexer && "Got EOF but no current lexer set!");
|
2008-12-24 03:24:24 +08:00
|
|
|
CurPTHLexer->getEOF(Result);
|
2008-11-20 06:43:49 +08:00
|
|
|
CurPTHLexer.reset();
|
2008-03-09 12:10:46 +08:00
|
|
|
}
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-11-20 05:57:25 +08:00
|
|
|
CurPPLexer = 0;
|
2008-03-09 12:10:46 +08:00
|
|
|
|
2010-12-16 02:44:22 +08:00
|
|
|
// This is the end of the top-level file. 'WarnUnusedMacroLocs' has collected
|
|
|
|
// all macro locations that we need to warn because they are not used.
|
|
|
|
for (WarnUnusedMacroLocsTy::iterator
|
|
|
|
I=WarnUnusedMacroLocs.begin(), E=WarnUnusedMacroLocs.end(); I!=E; ++I)
|
|
|
|
Diag(*I, diag::pp_macro_not_used);
|
2010-03-23 13:09:10 +08:00
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// HandleEndOfTokenLexer - This callback is invoked when the current TokenLexer
|
|
|
|
/// hits the end of its token stream.
|
|
|
|
bool Preprocessor::HandleEndOfTokenLexer(Token &Result) {
|
2008-11-20 06:43:49 +08:00
|
|
|
assert(CurTokenLexer && !CurPPLexer &&
|
2008-03-09 12:10:46 +08:00
|
|
|
"Ending a macro when currently in a #include file!");
|
|
|
|
|
2011-06-30 06:20:11 +08:00
|
|
|
if (!MacroExpandingLexersStack.empty() &&
|
|
|
|
MacroExpandingLexersStack.back().first == CurTokenLexer.get())
|
|
|
|
removeCachedMacroExpandedTokensOfLastLexer();
|
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
// Delete or cache the now-dead macro expander.
|
|
|
|
if (NumCachedTokenLexers == TokenLexerCacheSize)
|
2008-11-14 01:11:24 +08:00
|
|
|
CurTokenLexer.reset();
|
2008-03-09 12:10:46 +08:00
|
|
|
else
|
2008-11-14 01:11:24 +08:00
|
|
|
TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer.take();
|
2008-03-09 12:10:46 +08:00
|
|
|
|
|
|
|
// Handle this like a #include file being popped off the stack.
|
|
|
|
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");
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
if (CurTokenLexer) {
|
|
|
|
// Delete or cache the now-dead macro expander.
|
|
|
|
if (NumCachedTokenLexers == TokenLexerCacheSize)
|
2008-11-14 01:11:24 +08:00
|
|
|
CurTokenLexer.reset();
|
2008-03-09 12:10:46 +08:00
|
|
|
else
|
2008-11-14 01:11:24 +08:00
|
|
|
TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer.take();
|
2009-09-09 23:08:12 +08:00
|
|
|
}
|
|
|
|
|
2008-11-14 00:51:03 +08:00
|
|
|
PopIncludeMacroStack();
|
2008-03-09 12:10:46 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/// 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) {
|
2008-11-20 06:43:49 +08:00
|
|
|
assert(CurTokenLexer && !CurPPLexer &&
|
2008-03-09 12:10:46 +08:00
|
|
|
"Pasted comment can only be formed from macro");
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
// 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
|
2011-02-28 10:37:51 +08:00
|
|
|
// explicit EOD token.
|
2008-11-20 06:43:49 +08:00
|
|
|
PreprocessorLexer *FoundLexer = 0;
|
2008-03-09 12:10:46 +08:00
|
|
|
bool LexerWasInPPMode = false;
|
|
|
|
for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
|
|
|
|
IncludeStackInfo &ISI = *(IncludeMacroStack.end()-i-1);
|
2008-11-20 06:43:49 +08:00
|
|
|
if (ISI.ThePPLexer == 0) continue; // Scan for a real lexer.
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
// Once we find a real lexer, mark it as raw mode (disabling macro
|
2011-02-28 10:37:51 +08:00
|
|
|
// expansions) and preprocessor mode (return EOD). We know that the lexer
|
2008-03-09 12:10:46 +08:00
|
|
|
// 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
|
2011-02-28 10:37:51 +08:00
|
|
|
// return EOD.
|
2008-11-20 06:43:49 +08:00
|
|
|
FoundLexer = ISI.ThePPLexer;
|
2008-03-09 12:10:46 +08:00
|
|
|
FoundLexer->LexingRawMode = true;
|
|
|
|
LexerWasInPPMode = FoundLexer->ParsingPreprocessorDirective;
|
|
|
|
FoundLexer->ParsingPreprocessorDirective = true;
|
|
|
|
break;
|
|
|
|
}
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
// 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);
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2011-02-28 10:37:51 +08:00
|
|
|
// Discarding comments as long as we don't have EOF or EOD. This 'comments
|
2008-03-09 12:10:46 +08:00
|
|
|
// 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.
|
2011-02-28 10:37:51 +08:00
|
|
|
while (Tok.isNot(tok::eod) && Tok.isNot(tok::eof))
|
2008-03-09 12:10:46 +08:00
|
|
|
Lex(Tok);
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2011-02-28 10:37:51 +08:00
|
|
|
// If we got an eod token, then we successfully found the end of the line.
|
|
|
|
if (Tok.is(tok::eod)) {
|
2008-03-09 12:10:46 +08:00
|
|
|
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;
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2011-02-28 10:37:51 +08:00
|
|
|
// If the lexer was already in preprocessor mode, just return the EOD token
|
2008-03-09 12:10:46 +08:00
|
|
|
// to finish the preprocessor line.
|
|
|
|
if (LexerWasInPPMode) return;
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
// Otherwise, switch out of PP mode and return the next lexed token.
|
|
|
|
FoundLexer->ParsingPreprocessorDirective = false;
|
|
|
|
return Lex(Tok);
|
|
|
|
}
|
2009-09-09 23:08:12 +08:00
|
|
|
|
2008-03-09 12:10:46 +08:00
|
|
|
// 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
|
2011-02-28 10:37:51 +08:00
|
|
|
// active (an active lexer would return EOD at EOF if there was no \n in
|
2008-03-09 12:10:46 +08:00
|
|
|
// preprocessor directive mode), so just return EOF as our token.
|
2011-02-28 10:37:51 +08:00
|
|
|
assert(!FoundLexer && "Lexer should return EOD before EOF in PP mode");
|
2008-03-09 12:10:46 +08:00
|
|
|
}
|