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//===-- ARMAsmLexer.cpp - Tokenize ARM 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/ARMBaseInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCTargetAsmLexer.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include <string>
#include <map>
using namespace llvm;
namespace {
class ARMBaseAsmLexer : public MCTargetAsmLexer {
const MCAsmInfo &AsmInfo;
const AsmToken &lexDefinite() {
return getLexer()->Lex();
}
AsmToken LexTokenUAL();
protected:
typedef std::map <std::string, unsigned> rmap_ty;
rmap_ty RegisterMap;
void InitRegisterMap(const MCRegisterInfo *info) {
unsigned numRegs = info->getNumRegs();
for (unsigned i = 0; i < numRegs; ++i) {
const char *regName = info->getName(i);
if (regName)
RegisterMap[regName] = i;
}
}
unsigned MatchRegisterName(StringRef Name) {
rmap_ty::iterator iter = RegisterMap.find(Name.str());
if (iter != RegisterMap.end())
return iter->second;
else
return 0;
}
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 LexTokenUAL();
}
}
public:
ARMBaseAsmLexer(const Target &T, const MCAsmInfo &MAI)
: MCTargetAsmLexer(T), AsmInfo(MAI) {
}
};
class ARMAsmLexer : public ARMBaseAsmLexer {
public:
ARMAsmLexer(const Target &T, const MCRegisterInfo &MRI, const MCAsmInfo &MAI)
: ARMBaseAsmLexer(T, MAI) {
InitRegisterMap(&MRI);
}
};
class ThumbAsmLexer : public ARMBaseAsmLexer {
public:
ThumbAsmLexer(const Target &T, const MCRegisterInfo &MRI,const MCAsmInfo &MAI)
: ARMBaseAsmLexer(T, MAI) {
InitRegisterMap(&MRI);
}
};
} // end anonymous namespace
AsmToken ARMBaseAsmLexer::LexTokenUAL() {
const AsmToken &lexedToken = lexDefinite();
switch (lexedToken.getKind()) {
default: break;
case AsmToken::Error:
SetError(Lexer->getErrLoc(), Lexer->getErr());
break;
case AsmToken::Identifier: {
std::string upperCase = lexedToken.getString().str();
std::string lowerCase = LowercaseString(upperCase);
StringRef lowerRef(lowerCase);
unsigned regID = MatchRegisterName(lowerRef);
// Check for register aliases.
// r13 -> sp
// r14 -> lr
// r15 -> pc
// ip -> r12
// FIXME: Some assemblers support lots of others. Do we want them all?
if (!regID) {
regID = StringSwitch<unsigned>(lowerCase)
.Case("r13", ARM::SP)
.Case("r14", ARM::LR)
.Case("r15", ARM::PC)
.Case("ip", ARM::R12)
.Default(0);
}
if (regID)
return AsmToken(AsmToken::Register,
lexedToken.getString(),
static_cast<int64_t>(regID));
}
}
return AsmToken(lexedToken);
}
extern "C" void LLVMInitializeARMAsmLexer() {
RegisterMCAsmLexer<ARMAsmLexer> X(TheARMTarget);
RegisterMCAsmLexer<ThumbAsmLexer> Y(TheThumbTarget);
}
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