1 //===-- X86AsmLexer.cpp - Tokenize X86 assembly to AsmTokens --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/ADT/SmallVector.h"
11 #include "llvm/ADT/StringExtras.h"
12 #include "llvm/Target/TargetAsmLexer.h"
13 #include "llvm/Target/TargetRegistry.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCParser/MCAsmLexer.h"
16 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
23 class X86AsmLexer : public TargetAsmLexer {
24 const MCAsmInfo &AsmInfo;
26 bool tentativeIsValid;
27 AsmToken tentativeToken;
29 const AsmToken &lexTentative() {
30 tentativeToken = getLexer()->Lex();
31 tentativeIsValid = true;
32 return tentativeToken;
35 const AsmToken &lexDefinite() {
36 if(tentativeIsValid) {
37 tentativeIsValid = false;
38 return tentativeToken;
41 return getLexer()->Lex();
45 AsmToken LexTokenATT();
46 AsmToken LexTokenIntel();
50 SetError(SMLoc(), "No MCAsmLexer installed");
51 return AsmToken(AsmToken::Error, "", 0);
54 switch (AsmInfo.getAssemblerDialect()) {
56 SetError(SMLoc(), "Unhandled dialect");
57 return AsmToken(AsmToken::Error, "", 0);
61 return LexTokenIntel();
65 X86AsmLexer(const Target &T, const MCAsmInfo &MAI)
66 : TargetAsmLexer(T), AsmInfo(MAI), tentativeIsValid(false) {
72 static unsigned MatchRegisterName(const StringRef &Name);
74 AsmToken X86AsmLexer::LexTokenATT() {
75 const AsmToken lexedToken = lexDefinite();
77 switch (lexedToken.getKind()) {
79 return AsmToken(lexedToken);
81 SetError(Lexer->getErrLoc(), Lexer->getErr());
82 return AsmToken(lexedToken);
83 case AsmToken::Percent:
85 const AsmToken &nextToken = lexTentative();
86 if (nextToken.getKind() == AsmToken::Identifier) {
87 unsigned regID = MatchRegisterName(nextToken.getString());
92 StringRef regStr(lexedToken.getString().data(),
93 lexedToken.getString().size() +
94 nextToken.getString().size());
96 return AsmToken(AsmToken::Register,
98 static_cast<int64_t>(regID));
101 return AsmToken(lexedToken);
105 return AsmToken(lexedToken);
111 AsmToken X86AsmLexer::LexTokenIntel() {
112 const AsmToken &lexedToken = lexDefinite();
114 switch(lexedToken.getKind()) {
116 return AsmToken(lexedToken);
117 case AsmToken::Error:
118 SetError(Lexer->getErrLoc(), Lexer->getErr());
119 return AsmToken(lexedToken);
120 case AsmToken::Identifier:
122 std::string upperCase = lexedToken.getString().str();
123 std::string lowerCase = LowercaseString(upperCase);
124 StringRef lowerRef(lowerCase);
126 unsigned regID = MatchRegisterName(lowerRef);
129 return AsmToken(AsmToken::Register,
130 lexedToken.getString(),
131 static_cast<int64_t>(regID));
134 return AsmToken(lexedToken);
140 extern "C" void LLVMInitializeX86AsmLexer() {
141 RegisterAsmLexer<X86AsmLexer> X(TheX86_32Target);
142 RegisterAsmLexer<X86AsmLexer> Y(TheX86_64Target);
145 #define REGISTERS_ONLY
146 #include "X86GenAsmMatcher.inc"
147 #undef REGISTERS_ONLY