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Sean Callanan90b70972010-04-07 20:29:34 +00001//===-- ARMAsmLexer.cpp - Tokenize ARM assembly to AsmTokens --------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "ARM.h"
11#include "ARMTargetMachine.h"
12
Sean Callanan90b70972010-04-07 20:29:34 +000013#include "llvm/MC/MCAsmInfo.h"
14#include "llvm/MC/MCParser/MCAsmLexer.h"
15#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
16
17#include "llvm/Target/TargetAsmLexer.h"
18#include "llvm/Target/TargetMachine.h"
19#include "llvm/Target/TargetRegistry.h"
20
Bill Wendling2c502f92011-01-03 23:59:05 +000021#include "llvm/ADT/OwningPtr.h"
22#include "llvm/ADT/SmallVector.h"
23#include "llvm/ADT/StringExtras.h"
24#include "llvm/ADT/StringSwitch.h"
25
Sean Callanan90b70972010-04-07 20:29:34 +000026#include <string>
27#include <map>
28
29using namespace llvm;
30
31namespace {
Jim Grosbach9584bd82010-12-22 23:26:02 +000032
Bill Wendling2c502f92011-01-03 23:59:05 +000033class ARMBaseAsmLexer : public TargetAsmLexer {
34 const MCAsmInfo &AsmInfo;
Jim Grosbach9584bd82010-12-22 23:26:02 +000035
Bill Wendling2c502f92011-01-03 23:59:05 +000036 const AsmToken &lexDefinite() {
37 return getLexer()->Lex();
38 }
39
40 AsmToken LexTokenUAL();
41protected:
42 typedef std::map <std::string, unsigned> rmap_ty;
43
44 rmap_ty RegisterMap;
45
46 void InitRegisterMap(const TargetRegisterInfo *info) {
47 unsigned numRegs = info->getNumRegs();
48
49 for (unsigned i = 0; i < numRegs; ++i) {
50 const char *regName = info->getName(i);
51 if (regName)
52 RegisterMap[regName] = i;
53 }
54 }
55
56 unsigned MatchRegisterName(StringRef Name) {
57 rmap_ty::iterator iter = RegisterMap.find(Name.str());
58 if (iter != RegisterMap.end())
59 return iter->second;
60 else
61 return 0;
62 }
63
64 AsmToken LexToken() {
65 if (!Lexer) {
66 SetError(SMLoc(), "No MCAsmLexer installed");
67 return AsmToken(AsmToken::Error, "", 0);
Sean Callanan90b70972010-04-07 20:29:34 +000068 }
Jim Grosbach9584bd82010-12-22 23:26:02 +000069
Bill Wendling2c502f92011-01-03 23:59:05 +000070 switch (AsmInfo.getAssemblerDialect()) {
71 default:
72 SetError(SMLoc(), "Unhandled dialect");
73 return AsmToken(AsmToken::Error, "", 0);
74 case 0:
75 return LexTokenUAL();
Sean Callanan90b70972010-04-07 20:29:34 +000076 }
Bill Wendling2c502f92011-01-03 23:59:05 +000077 }
78public:
79 ARMBaseAsmLexer(const Target &T, const MCAsmInfo &MAI)
80 : TargetAsmLexer(T), AsmInfo(MAI) {
81 }
82};
Jim Grosbach9584bd82010-12-22 23:26:02 +000083
Bill Wendling2c502f92011-01-03 23:59:05 +000084class ARMAsmLexer : public ARMBaseAsmLexer {
85public:
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());
93 }
94};
Jim Grosbach9584bd82010-12-22 23:26:02 +000095
Bill Wendling2c502f92011-01-03 23:59:05 +000096class ThumbAsmLexer : public ARMBaseAsmLexer {
97public:
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());
105 }
106};
Jim Grosbach9584bd82010-12-22 23:26:02 +0000107
Bill Wendling2c502f92011-01-03 23:59:05 +0000108} // end anonymous namespace
Sean Callanan90b70972010-04-07 20:29:34 +0000109
110AsmToken ARMBaseAsmLexer::LexTokenUAL() {
111 const AsmToken &lexedToken = lexDefinite();
Jim Grosbach9584bd82010-12-22 23:26:02 +0000112
Sean Callanan90b70972010-04-07 20:29:34 +0000113 switch (lexedToken.getKind()) {
Bill Wendling2c502f92011-01-03 23:59:05 +0000114 default: break;
Sean Callanan90b70972010-04-07 20:29:34 +0000115 case AsmToken::Error:
116 SetError(Lexer->getErrLoc(), Lexer->getErr());
Bill Wendling2c502f92011-01-03 23:59:05 +0000117 break;
118 case AsmToken::Identifier: {
Sean Callanan90b70972010-04-07 20:29:34 +0000119 std::string upperCase = lexedToken.getString().str();
120 std::string lowerCase = LowercaseString(upperCase);
121 StringRef lowerRef(lowerCase);
Jim Grosbach9584bd82010-12-22 23:26:02 +0000122
Sean Callanan90b70972010-04-07 20:29:34 +0000123 unsigned regID = MatchRegisterName(lowerRef);
Jim Grosbach940c8e52010-12-23 23:19:54 +0000124 // Check for register aliases.
125 // r13 -> sp
126 // r14 -> lr
127 // r15 -> pc
128 // ip -> r12
129 // FIXME: Some assemblers support lots of others. Do we want them all?
130 if (!regID) {
Jim Grosbachf12eee72010-12-24 00:03:39 +0000131 regID = StringSwitch<unsigned>(lowerCase)
132 .Case("r13", ARM::SP)
133 .Case("r14", ARM::LR)
134 .Case("r15", ARM::PC)
135 .Case("ip", ARM::R12)
136 .Default(0);
Jim Grosbach940c8e52010-12-23 23:19:54 +0000137 }
Jim Grosbach9584bd82010-12-22 23:26:02 +0000138
Bill Wendling2c502f92011-01-03 23:59:05 +0000139 if (regID)
Sean Callanan90b70972010-04-07 20:29:34 +0000140 return AsmToken(AsmToken::Register,
141 lexedToken.getString(),
142 static_cast<int64_t>(regID));
Sean Callanan90b70972010-04-07 20:29:34 +0000143 }
144 }
Bill Wendling2c502f92011-01-03 23:59:05 +0000145
146 return AsmToken(lexedToken);
Sean Callanan90b70972010-04-07 20:29:34 +0000147}
148
149extern "C" void LLVMInitializeARMAsmLexer() {
150 RegisterAsmLexer<ARMAsmLexer> X(TheARMTarget);
151 RegisterAsmLexer<ThumbAsmLexer> Y(TheThumbTarget);
152}