1 //===-- MBlazeAsmLexer.cpp - Tokenize MBlaze 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 "MCTargetDesc/MBlazeBaseInfo.h"
11
12 #include "llvm/MC/MCAsmInfo.h"
13 #include "llvm/MC/MCParser/MCAsmLexer.h"
14 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
15 #include "llvm/MC/MCRegisterInfo.h"
16 #include "llvm/MC/MCTargetAsmLexer.h"
17
18 #include "llvm/Support/TargetRegistry.h"
19
20 #include <string>
21 #include <map>
22
23 using namespace llvm;
24
25 namespace {
26
27 class MBlazeBaseAsmLexer : public MCTargetAsmLexer {
28 const MCAsmInfo &AsmInfo;
29
lexDefinite()30 const AsmToken &lexDefinite() {
31 return getLexer()->Lex();
32 }
33
34 AsmToken LexTokenUAL();
35 protected:
36 typedef std::map <std::string, unsigned> rmap_ty;
37
38 rmap_ty RegisterMap;
39
InitRegisterMap(const MCRegisterInfo * info)40 void InitRegisterMap(const MCRegisterInfo *info) {
41 unsigned numRegs = info->getNumRegs();
42
43 for (unsigned i = 0; i < numRegs; ++i) {
44 const char *regName = info->getName(i);
45 if (regName)
46 RegisterMap[regName] = i;
47 }
48 }
49
MatchRegisterName(StringRef Name)50 unsigned MatchRegisterName(StringRef Name) {
51 rmap_ty::iterator iter = RegisterMap.find(Name.str());
52 if (iter != RegisterMap.end())
53 return iter->second;
54 else
55 return 0;
56 }
57
LexToken()58 AsmToken LexToken() {
59 if (!Lexer) {
60 SetError(SMLoc(), "No MCAsmLexer installed");
61 return AsmToken(AsmToken::Error, "", 0);
62 }
63
64 switch (AsmInfo.getAssemblerDialect()) {
65 default:
66 SetError(SMLoc(), "Unhandled dialect");
67 return AsmToken(AsmToken::Error, "", 0);
68 case 0:
69 return LexTokenUAL();
70 }
71 }
72 public:
MBlazeBaseAsmLexer(const Target & T,const MCAsmInfo & MAI)73 MBlazeBaseAsmLexer(const Target &T, const MCAsmInfo &MAI)
74 : MCTargetAsmLexer(T), AsmInfo(MAI) {
75 }
76 };
77
78 class MBlazeAsmLexer : public MBlazeBaseAsmLexer {
79 public:
MBlazeAsmLexer(const Target & T,const MCRegisterInfo & MRI,const MCAsmInfo & MAI)80 MBlazeAsmLexer(const Target &T, const MCRegisterInfo &MRI,
81 const MCAsmInfo &MAI)
82 : MBlazeBaseAsmLexer(T, MAI) {
83 InitRegisterMap(&MRI);
84 }
85 };
86 }
87
LexTokenUAL()88 AsmToken MBlazeBaseAsmLexer::LexTokenUAL() {
89 const AsmToken &lexedToken = lexDefinite();
90
91 switch (lexedToken.getKind()) {
92 default:
93 return AsmToken(lexedToken);
94 case AsmToken::Error:
95 SetError(Lexer->getErrLoc(), Lexer->getErr());
96 return AsmToken(lexedToken);
97 case AsmToken::Identifier:
98 {
99 unsigned regID = MatchRegisterName(lexedToken.getString().lower());
100
101 if (regID) {
102 return AsmToken(AsmToken::Register,
103 lexedToken.getString(),
104 static_cast<int64_t>(regID));
105 } else {
106 return AsmToken(lexedToken);
107 }
108 }
109 }
110 }
111
LLVMInitializeMBlazeAsmLexer()112 extern "C" void LLVMInitializeMBlazeAsmLexer() {
113 RegisterMCAsmLexer<MBlazeAsmLexer> X(TheMBlazeTarget);
114 }
115
116