1 //===-- ARMAsmLexer.cpp - Tokenize ARM 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 //===----------------------------------------------------------------------===//
11 #include "ARMTargetMachine.h"
13 #include "llvm/MC/MCAsmInfo.h"
14 #include "llvm/MC/MCParser/MCAsmLexer.h"
15 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
17 #include "llvm/Target/TargetAsmLexer.h"
18 #include "llvm/Target/TargetMachine.h"
19 #include "llvm/Target/TargetRegistry.h"
21 #include "llvm/ADT/OwningPtr.h"
22 #include "llvm/ADT/SmallVector.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringSwitch.h"
33 class ARMBaseAsmLexer : public TargetAsmLexer {
34 const MCAsmInfo &AsmInfo;
36 const AsmToken &lexDefinite() {
37 return getLexer()->Lex();
40 AsmToken LexTokenUAL();
42 typedef std::map <std::string, unsigned> rmap_ty;
46 void InitRegisterMap(const TargetRegisterInfo *info) {
47 unsigned numRegs = info->getNumRegs();
49 for (unsigned i = 0; i < numRegs; ++i) {
50 const char *regName = info->getName(i);
52 RegisterMap[regName] = i;
56 unsigned MatchRegisterName(StringRef Name) {
57 rmap_ty::iterator iter = RegisterMap.find(Name.str());
58 if (iter != RegisterMap.end())
66 SetError(SMLoc(), "No MCAsmLexer installed");
67 return AsmToken(AsmToken::Error, "", 0);
70 switch (AsmInfo.getAssemblerDialect()) {
72 SetError(SMLoc(), "Unhandled dialect");
73 return AsmToken(AsmToken::Error, "", 0);
79 ARMBaseAsmLexer(const Target &T, const MCAsmInfo &MAI)
80 : TargetAsmLexer(T), AsmInfo(MAI) {
84 class ARMAsmLexer : public ARMBaseAsmLexer {
86 ARMAsmLexer(const Target &T, const MCAsmInfo &MAI)
87 : ARMBaseAsmLexer(T, MAI) {
88 std::string tripleString("arm-unknown-unknown");
89 std::string featureString;
90 OwningPtr<const TargetMachine>
91 targetMachine(T.createTargetMachine(tripleString, featureString));
92 InitRegisterMap(targetMachine->getRegisterInfo());
96 class ThumbAsmLexer : public ARMBaseAsmLexer {
98 ThumbAsmLexer(const Target &T, const MCAsmInfo &MAI)
99 : ARMBaseAsmLexer(T, MAI) {
100 std::string tripleString("thumb-unknown-unknown");
101 std::string featureString;
102 OwningPtr<const TargetMachine>
103 targetMachine(T.createTargetMachine(tripleString, featureString));
104 InitRegisterMap(targetMachine->getRegisterInfo());
108 } // end anonymous namespace
110 AsmToken ARMBaseAsmLexer::LexTokenUAL() {
111 const AsmToken &lexedToken = lexDefinite();
113 switch (lexedToken.getKind()) {
115 case AsmToken::Error:
116 SetError(Lexer->getErrLoc(), Lexer->getErr());
118 case AsmToken::Identifier: {
119 std::string upperCase = lexedToken.getString().str();
120 std::string lowerCase = LowercaseString(upperCase);
121 StringRef lowerRef(lowerCase);
123 unsigned regID = MatchRegisterName(lowerRef);
124 // Check for register aliases.
129 // FIXME: Some assemblers support lots of others. Do we want them all?
131 regID = StringSwitch<unsigned>(lowerCase)
132 .Case("r13", ARM::SP)
133 .Case("r14", ARM::LR)
134 .Case("r15", ARM::PC)
135 .Case("ip", ARM::R12)
140 return AsmToken(AsmToken::Register,
141 lexedToken.getString(),
142 static_cast<int64_t>(regID));
146 return AsmToken(lexedToken);
149 extern "C" void LLVMInitializeARMAsmLexer() {
150 RegisterAsmLexer<ARMAsmLexer> X(TheARMTarget);
151 RegisterAsmLexer<ThumbAsmLexer> Y(TheThumbTarget);