clang  10.0.0svn
PreprocessorLexer.cpp
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1 //===- PreprocessorLexer.cpp - C Language Family Lexer --------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the PreprocessorLexer and Token interfaces.
10 //
11 //===----------------------------------------------------------------------===//
12 
16 #include "clang/Lex/Preprocessor.h"
17 #include "clang/Lex/Token.h"
18 #include <cassert>
19 
20 using namespace clang;
21 
22 void PreprocessorLexer::anchor() {}
23 
25  : PP(pp), FID(fid) {
26  if (pp)
28 }
29 
30 /// After the preprocessor has parsed a \#include, lex and
31 /// (potentially) macro expand the filename.
33  assert(ParsingFilename == false && "reentered LexIncludeFilename");
34 
35  // We are now parsing a filename!
36  ParsingFilename = true;
37 
38  // Lex the filename.
39  if (LexingRawMode)
40  IndirectLex(FilenameTok);
41  else
42  PP->Lex(FilenameTok);
43 
44  // We should have obtained the filename now.
45  ParsingFilename = false;
46 }
47 
48 /// getFileEntry - Return the FileEntry corresponding to this FileID. Like
49 /// getFileID(), this only works for lexers with attached preprocessors.
52 }
unsigned InitialNumSLocEntries
Number of SLocEntries before lexing the file.
Defines the SourceManager interface.
Token - This structure provides full information about a lexed token.
Definition: Token.h:34
const FileID FID
The SourceManager FileID corresponding to the file being lexed.
unsigned local_sloc_entry_size() const
Get the number of local SLocEntries we have.
bool ParsingFilename
True after #include; turns <xx> or "xxx" into a tok::header_name token.
bool LexingRawMode
True if in raw mode.
const FileEntry * getFileEntryForID(FileID FID) const
Returns the FileEntry record for the provided FileID.
Defines the clang::Preprocessor interface.
SourceManager & getSourceManager() const
Definition: Preprocessor.h:908
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:78
void Lex(Token &Result)
Lex the next token for this preprocessor.
An opaque identifier used by SourceManager which refers to a source file (MemoryBuffer) along with it...
Dataflow Directional Tag Classes.
const FileEntry * getFileEntry() const
getFileEntry - Return the FileEntry corresponding to this FileID.
virtual void IndirectLex(Token &Result)=0
Defines the PreprocessorLexer interface.
void LexIncludeFilename(Token &FilenameTok)
Lex a token, producing a header-name token if possible.
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:125