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//===-- 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 "MCTargetDesc/X86BaseInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCTargetAsmLexer.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
namespace {
class X86AsmLexer : public MCTargetAsmLexer {
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;
}
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 MCRegisterInfo &MRI, const MCAsmInfo &MAI)
: MCTargetAsmLexer(T), AsmInfo(MAI), tentativeIsValid(false) {
}
};
} // end anonymous namespace
#define GET_REGISTER_MATCHER
#include "X86GenAsmMatcher.inc"
AsmToken X86AsmLexer::LexTokenATT() {
AsmToken lexedToken = lexDefinite();
switch (lexedToken.getKind()) {
default:
return lexedToken;
case AsmToken::Error:
SetError(Lexer->getErrLoc(), Lexer->getErr());
return lexedToken;
case AsmToken::Percent: {
const AsmToken &nextToken = lexTentative();
if (nextToken.getKind() != AsmToken::Identifier)
return lexedToken;
if (unsigned regID = MatchRegisterName(nextToken.getString())) {
lexDefinite();
// FIXME: This is completely wrong when there is a space or other
// punctuation between the % and the register name.
StringRef regStr(lexedToken.getString().data(),
lexedToken.getString().size() +
nextToken.getString().size());
return AsmToken(AsmToken::Register, regStr,
static_cast<int64_t>(regID));
}
// Match register name failed. If this is "db[0-7]", match it as an alias
// for dr[0-7].
if (nextToken.getString().size() == 3 &&
nextToken.getString().startswith("db")) {
int RegNo = -1;
switch (nextToken.getString()[2]) {
case '0': RegNo = X86::DR0; break;
case '1': RegNo = X86::DR1; break;
case '2': RegNo = X86::DR2; break;
case '3': RegNo = X86::DR3; break;
case '4': RegNo = X86::DR4; break;
case '5': RegNo = X86::DR5; break;
case '6': RegNo = X86::DR6; break;
case '7': RegNo = X86::DR7; break;
}
if (RegNo != -1) {
lexDefinite();
// FIXME: This is completely wrong when there is a space or other
// punctuation between the % and the register name.
StringRef regStr(lexedToken.getString().data(),
lexedToken.getString().size() +
nextToken.getString().size());
return AsmToken(AsmToken::Register, regStr,
static_cast<int64_t>(RegNo));
}
}
return lexedToken;
}
}
}
AsmToken X86AsmLexer::LexTokenIntel() {
const AsmToken &lexedToken = lexDefinite();
switch(lexedToken.getKind()) {
default:
return lexedToken;
case AsmToken::Error:
SetError(Lexer->getErrLoc(), Lexer->getErr());
return 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));
return lexedToken;
}
}
}
extern "C" void LLVMInitializeX86AsmLexer() {
RegisterMCAsmLexer<X86AsmLexer> X(TheX86_32Target);
RegisterMCAsmLexer<X86AsmLexer> Y(TheX86_64Target);
}
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