0834a4b901
Before this patch, Lex() would recurse whenever the current lexer changed (e.g. upon entry into a macro). This patch turns the recursion into a loop: the various lex routines now don't return a token when the current lexer changes, and at the top level Preprocessor::Lex() now loops until it finds a token. Normally, the recursion wouldn't end up being very deep, but the recursion depth can explode in edge cases like a bunch of consecutive macros which expand to nothing (like in the testcase test/Preprocessor/macro_expand_empty.c in this patch). <rdar://problem/14569770> llvm-svn: 190980
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
//===--- PreprocessorLexer.cpp - C Language Family Lexer ------------------===//
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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 the PreprocessorLexer and Token interfaces.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/PreprocessorLexer.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/LexDiagnostic.h"
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#include "clang/Lex/Preprocessor.h"
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using namespace clang;
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void PreprocessorLexer::anchor() { }
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PreprocessorLexer::PreprocessorLexer(Preprocessor *pp, FileID fid)
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: PP(pp), FID(fid), InitialNumSLocEntries(0),
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ParsingPreprocessorDirective(false),
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ParsingFilename(false), LexingRawMode(false) {
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if (pp)
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InitialNumSLocEntries = pp->getSourceManager().local_sloc_entry_size();
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}
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/// \brief After the preprocessor has parsed a \#include, lex and
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/// (potentially) macro expand the filename.
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void PreprocessorLexer::LexIncludeFilename(Token &FilenameTok) {
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assert(ParsingPreprocessorDirective &&
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ParsingFilename == false &&
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"Must be in a preprocessing directive!");
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// We are now parsing a filename!
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ParsingFilename = true;
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// Lex the filename.
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if (LexingRawMode)
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IndirectLex(FilenameTok);
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else
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PP->Lex(FilenameTok);
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// We should have obtained the filename now.
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ParsingFilename = false;
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// No filename?
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if (FilenameTok.is(tok::eod))
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PP->Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
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}
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/// getFileEntry - Return the FileEntry corresponding to this FileID. Like
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/// getFileID(), this only works for lexers with attached preprocessors.
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const FileEntry *PreprocessorLexer::getFileEntry() const {
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return PP->getSourceManager().getFileEntryForID(getFileID());
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}
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