llvm-6502/lib/Target/X86/AsmParser/X86AsmLexer.cpp
2010-02-09 00:34:28 +00:00

148 lines
3.6 KiB
C++

//===-- X86AsmLexer.cpp - Tokenize X86 assembly to AsmTokens --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Target/TargetAsmLexer.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "X86.h"
using namespace llvm;
namespace {
class X86AsmLexer : public TargetAsmLexer {
const MCAsmInfo &AsmInfo;
bool tentativeIsValid;
AsmToken tentativeToken;
const AsmToken &lexTentative() {
tentativeToken = getLexer()->Lex();
tentativeIsValid = true;
return tentativeToken;
}
const AsmToken &lexDefinite() {
if(tentativeIsValid) {
tentativeIsValid = false;
return tentativeToken;
}
else {
return getLexer()->Lex();
}
}
AsmToken LexTokenATT();
AsmToken LexTokenIntel();
protected:
AsmToken LexToken() {
if (!Lexer) {
SetError(SMLoc(), "No MCAsmLexer installed");
return AsmToken(AsmToken::Error, "", 0);
}
switch (AsmInfo.getAssemblerDialect()) {
default:
SetError(SMLoc(), "Unhandled dialect");
return AsmToken(AsmToken::Error, "", 0);
case 0:
return LexTokenATT();
case 1:
return LexTokenIntel();
}
}
public:
X86AsmLexer(const Target &T, const MCAsmInfo &MAI)
: TargetAsmLexer(T), AsmInfo(MAI), tentativeIsValid(false) {
}
};
}
static unsigned MatchRegisterName(StringRef Name);
AsmToken X86AsmLexer::LexTokenATT() {
const AsmToken lexedToken = lexDefinite();
switch (lexedToken.getKind()) {
default:
return AsmToken(lexedToken);
case AsmToken::Error:
SetError(Lexer->getErrLoc(), Lexer->getErr());
return AsmToken(lexedToken);
case AsmToken::Percent:
{
const AsmToken &nextToken = lexTentative();
if (nextToken.getKind() == AsmToken::Identifier) {
unsigned regID = MatchRegisterName(nextToken.getString());
if (regID) {
lexDefinite();
StringRef regStr(lexedToken.getString().data(),
lexedToken.getString().size() +
nextToken.getString().size());
return AsmToken(AsmToken::Register,
regStr,
static_cast<int64_t>(regID));
}
else {
return AsmToken(lexedToken);
}
}
else {
return AsmToken(lexedToken);
}
}
}
}
AsmToken X86AsmLexer::LexTokenIntel() {
const AsmToken &lexedToken = lexDefinite();
switch(lexedToken.getKind()) {
default:
return AsmToken(lexedToken);
case AsmToken::Error:
SetError(Lexer->getErrLoc(), Lexer->getErr());
return AsmToken(lexedToken);
case AsmToken::Identifier:
{
std::string upperCase = lexedToken.getString().str();
std::string lowerCase = LowercaseString(upperCase);
StringRef lowerRef(lowerCase);
unsigned regID = MatchRegisterName(lowerRef);
if (regID) {
return AsmToken(AsmToken::Register,
lexedToken.getString(),
static_cast<int64_t>(regID));
}
else {
return AsmToken(lexedToken);
}
}
}
}
extern "C" void LLVMInitializeX86AsmLexer() {
RegisterAsmLexer<X86AsmLexer> X(TheX86_32Target);
RegisterAsmLexer<X86AsmLexer> Y(TheX86_64Target);
}
#define REGISTERS_ONLY
#include "X86GenAsmMatcher.inc"
#undef REGISTERS_ONLY