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MCParser: add a single token lookahead

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Some of the more complex directive and macro handling for GAS compatibility
requires lookahead.  Add a single token lookahead in the MCAsmLexer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201058 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool
2014-02-09 23:29:24 +00:00
parent a4122f4746
commit 537dca94b3
3 changed files with 27 additions and 0 deletions
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22
lib/MC/MCParser/AsmLexer.cpp
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@@ -439,6 +439,28 @@ StringRef AsmLexer::LexUntilEndOfLine() {
return StringRef(TokStart, CurPtr-TokStart);
}
const AsmToken AsmLexer::peekTok(bool ShouldSkipSpace) {
const char *SavedTokStart = TokStart;
const char *SavedCurPtr = CurPtr;
bool SavedAtStartOfLine = isAtStartOfLine;
bool SavedSkipSpace = SkipSpace;
std::string SavedErr = getErr();
SMLoc SavedErrLoc = getErrLoc();
SkipSpace = ShouldSkipSpace;
AsmToken Token = LexToken();
SetError(SavedErrLoc, SavedErr);
SkipSpace = SavedSkipSpace;
isAtStartOfLine = SavedAtStartOfLine;
CurPtr = SavedCurPtr;
TokStart = SavedTokStart;
return Token;
}
bool AsmLexer::isAtStartOfComment(char Char) {
// FIXME: This won't work for multi-character comment indicators like "//".
return Char == *MAI.getCommentString();