add a simplified lexer ctor that sets up the lexer to raw-lex an
entire file.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62414 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/Lexer.cpp b/lib/Lex/Lexer.cpp
index e898150..704c4db 100644
--- a/lib/Lex/Lexer.cpp
+++ b/lib/Lex/Lexer.cpp
@@ -127,7 +127,6 @@
const char *BufPtr, const char *BufEnd,
const llvm::MemoryBuffer *FromFile)
: FileLoc(fileloc), Features(features) {
-
// If a MemoryBuffer was specified, use its start as BufferStart. This affects
// the source location objects produced by this lexer.
@@ -140,6 +139,20 @@
LexingRawMode = true;
}
+/// Lexer constructor - Create a new raw lexer object. This object is only
+/// suitable for calls to 'LexRawToken'. This lexer assumes that the text
+/// range will outlive it, so it doesn't take ownership of it.
+Lexer::Lexer(FileID FID, const SourceManager &SM, const LangOptions &features)
+ : FileLoc(SM.getLocForStartOfFile(FID)), Features(features) {
+ const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
+
+ InitLexer(FromFile->getBufferStart(), FromFile->getBufferStart(),
+ FromFile->getBufferEnd());
+
+ // We *are* in raw mode.
+ LexingRawMode = true;
+}
+
/// Stringify - Convert the specified string into a C string, with surrounding
/// ""'s, and with escaped \ and " characters.