clang/lib/Lex/PreprocessorLexer.cpp

   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
  13 #include "clang/Lex/PreprocessorLexer.h"
  14 #include "clang/Basic/SourceManager.h"
  15 #include "clang/Lex/LexDiagnostic.h"
  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
  24 PreprocessorLexer::PreprocessorLexer(Preprocessor *pp, FileID fid)
  25     : PP(pp), FID(fid) {
  26   if (pp)
  27     InitialNumSLocEntries = pp->getSourceManager().local_sloc_entry_size();
  28 }
  29
  30 /// After the preprocessor has parsed a \#include, lex and
  31 /// (potentially) macro expand the filename.
  32 void PreprocessorLexer::LexIncludeFilename(Token &FilenameTok) {
  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.
  50 OptionalFileEntryRefDegradesToFileEntryPtr
  51 PreprocessorLexer::getFileEntry() const {
  52   return PP->getSourceManager().getFileEntryRefForID(getFileID());
  53 }