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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143891 91177308-0d34-0410-b5e6-96231b3b80d8
161 lines
4.5 KiB
C++
161 lines
4.5 KiB
C++
//===-- X86AsmLexer.cpp - Tokenize X86 assembly to AsmTokens --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/X86BaseInfo.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCParser/MCAsmLexer.h"
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#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
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#include "llvm/MC/MCTargetAsmLexer.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/ADT/SmallVector.h"
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using namespace llvm;
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namespace {
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class X86AsmLexer : public MCTargetAsmLexer {
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const MCAsmInfo &AsmInfo;
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bool tentativeIsValid;
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AsmToken tentativeToken;
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const AsmToken &lexTentative() {
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tentativeToken = getLexer()->Lex();
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tentativeIsValid = true;
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return tentativeToken;
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}
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const AsmToken &lexDefinite() {
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if (tentativeIsValid) {
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tentativeIsValid = false;
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return tentativeToken;
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}
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return getLexer()->Lex();
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}
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AsmToken LexTokenATT();
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AsmToken LexTokenIntel();
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protected:
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AsmToken LexToken() {
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if (!Lexer) {
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SetError(SMLoc(), "No MCAsmLexer installed");
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return AsmToken(AsmToken::Error, "", 0);
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}
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switch (AsmInfo.getAssemblerDialect()) {
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default:
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SetError(SMLoc(), "Unhandled dialect");
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return AsmToken(AsmToken::Error, "", 0);
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case 0:
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return LexTokenATT();
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case 1:
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return LexTokenIntel();
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}
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}
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public:
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X86AsmLexer(const Target &T, const MCRegisterInfo &MRI, const MCAsmInfo &MAI)
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: MCTargetAsmLexer(T), AsmInfo(MAI), tentativeIsValid(false) {
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}
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};
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} // end anonymous namespace
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#define GET_REGISTER_MATCHER
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#include "X86GenAsmMatcher.inc"
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AsmToken X86AsmLexer::LexTokenATT() {
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AsmToken lexedToken = lexDefinite();
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switch (lexedToken.getKind()) {
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default:
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return lexedToken;
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case AsmToken::Error:
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SetError(Lexer->getErrLoc(), Lexer->getErr());
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return lexedToken;
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case AsmToken::Percent: {
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const AsmToken &nextToken = lexTentative();
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if (nextToken.getKind() != AsmToken::Identifier)
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return lexedToken;
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if (unsigned regID = MatchRegisterName(nextToken.getString())) {
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lexDefinite();
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// FIXME: This is completely wrong when there is a space or other
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// punctuation between the % and the register name.
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StringRef regStr(lexedToken.getString().data(),
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lexedToken.getString().size() +
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nextToken.getString().size());
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return AsmToken(AsmToken::Register, regStr,
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static_cast<int64_t>(regID));
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}
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// Match register name failed. If this is "db[0-7]", match it as an alias
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// for dr[0-7].
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if (nextToken.getString().size() == 3 &&
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nextToken.getString().startswith("db")) {
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int RegNo = -1;
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switch (nextToken.getString()[2]) {
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case '0': RegNo = X86::DR0; break;
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case '1': RegNo = X86::DR1; break;
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case '2': RegNo = X86::DR2; break;
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case '3': RegNo = X86::DR3; break;
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case '4': RegNo = X86::DR4; break;
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case '5': RegNo = X86::DR5; break;
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case '6': RegNo = X86::DR6; break;
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case '7': RegNo = X86::DR7; break;
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}
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if (RegNo != -1) {
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lexDefinite();
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// FIXME: This is completely wrong when there is a space or other
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// punctuation between the % and the register name.
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StringRef regStr(lexedToken.getString().data(),
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lexedToken.getString().size() +
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nextToken.getString().size());
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return AsmToken(AsmToken::Register, regStr,
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static_cast<int64_t>(RegNo));
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}
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}
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return lexedToken;
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}
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}
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}
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AsmToken X86AsmLexer::LexTokenIntel() {
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const AsmToken &lexedToken = lexDefinite();
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switch(lexedToken.getKind()) {
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default:
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return lexedToken;
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case AsmToken::Error:
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SetError(Lexer->getErrLoc(), Lexer->getErr());
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return lexedToken;
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case AsmToken::Identifier: {
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unsigned regID = MatchRegisterName(lexedToken.getString().lower());
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if (regID)
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return AsmToken(AsmToken::Register,
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lexedToken.getString(),
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static_cast<int64_t>(regID));
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return lexedToken;
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}
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}
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}
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extern "C" void LLVMInitializeX86AsmLexer() {
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RegisterMCAsmLexer<X86AsmLexer> X(TheX86_32Target);
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RegisterMCAsmLexer<X86AsmLexer> Y(TheX86_64Target);
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}
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