[PATCH] D14252: [AsmParser] Allow tokens to be put back in to the token stream.
Colin LeMahieu via llvm-commits
llvm-commits at lists.llvm.org
Sun Nov 8 15:50:55 PST 2015
This revision was automatically updated to reflect the committed changes.
Closed by commit rL252432: [AsmParser] Allow tokens to be put back in to the token stream. (authored by colinl).
Changed prior to commit:
http://reviews.llvm.org/D14252?vs=38959&id=39656#toc
Repository:
rL LLVM
http://reviews.llvm.org/D14252
Files:
llvm/trunk/include/llvm/MC/MCParser/MCAsmLexer.h
llvm/trunk/lib/MC/MCParser/MCAsmLexer.cpp
Index: llvm/trunk/include/llvm/MC/MCParser/MCAsmLexer.h
===================================================================
--- llvm/trunk/include/llvm/MC/MCParser/MCAsmLexer.h
+++ llvm/trunk/include/llvm/MC/MCParser/MCAsmLexer.h
@@ -118,7 +118,7 @@
/// lexers.
class MCAsmLexer {
/// The current token, stored in the base class for faster access.
- AsmToken CurTok;
+ SmallVector<AsmToken, 1> CurTok;
/// The location and description of the current error
SMLoc ErrLoc;
@@ -148,7 +148,15 @@
/// The lexer will continuosly return the end-of-file token once the end of
/// the main input file has been reached.
const AsmToken &Lex() {
- return CurTok = LexToken();
+ assert(!CurTok.empty());
+ CurTok.erase(CurTok.begin());
+ if (CurTok.empty())
+ CurTok.emplace_back(LexToken());
+ return CurTok.front();
+ }
+
+ void UnLex(AsmToken const &Token) {
+ CurTok.insert(CurTok.begin(), Token);
}
virtual StringRef LexUntilEndOfStatement() = 0;
@@ -158,7 +166,7 @@
/// Get the current (last) lexed token.
const AsmToken &getTok() const {
- return CurTok;
+ return CurTok[0];
}
/// Look ahead at the next token to be lexed.
Index: llvm/trunk/lib/MC/MCParser/MCAsmLexer.cpp
===================================================================
--- llvm/trunk/lib/MC/MCParser/MCAsmLexer.cpp
+++ llvm/trunk/lib/MC/MCParser/MCAsmLexer.cpp
@@ -12,8 +12,8 @@
using namespace llvm;
-MCAsmLexer::MCAsmLexer() : CurTok(AsmToken::Error, StringRef()),
- TokStart(nullptr), SkipSpace(true) {
+MCAsmLexer::MCAsmLexer() : TokStart(nullptr), SkipSpace(true) {
+ CurTok.emplace_back(AsmToken::Error, StringRef());
}
MCAsmLexer::~MCAsmLexer() {
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