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(ParsingPreprocessorDirective &&
34          ParsingFilename == false &&
35          "Must be in a preprocessing directive!");
36 
37   // We are now parsing a filename!
38   ParsingFilename = true;
39 
40   // Lex the filename.
41   if (LexingRawMode)
42     IndirectLex(FilenameTok);
43   else
44     PP->Lex(FilenameTok);
45 
46   // We should have obtained the filename now.
47   ParsingFilename = false;
48 
49   // No filename?
50   if (FilenameTok.is(tok::eod))
51     PP->Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
52 }
53 
54 /// getFileEntry - Return the FileEntry corresponding to this FileID.  Like
55 /// getFileID(), this only works for lexers with attached preprocessors.
56 const FileEntry *PreprocessorLexer::getFileEntry() const {
57   return PP->getSourceManager().getFileEntryForID(getFileID());
58 }
59