ARMMCTargetDesc.cpp revision 0ddff1b5359433faf2eb1c4ff5320ddcbd42f52f 
1//===-- ARMMCTargetDesc.cpp - ARM Target Descriptions -----------*- C++ -*-===//
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// This file provides ARM specific target descriptions.
11//
12//===----------------------------------------------------------------------===//
13
14#include "ARMMCTargetDesc.h"
15#include "llvm/MC/MCInstrInfo.h"
16#include "llvm/MC/MCRegisterInfo.h"
17#include "llvm/MC/MCSubtargetInfo.h"
18#include "llvm/Target/TargetRegistry.h"
19
20#define GET_REGINFO_MC_DESC
21#include "ARMGenRegisterInfo.inc"
22
23#define GET_INSTRINFO_MC_DESC
24#include "ARMGenInstrInfo.inc"
25
26#define GET_SUBTARGETINFO_MC_DESC
27#include "ARMGenSubtargetInfo.inc"
28
29using namespace llvm;
30
31MCInstrInfo *createARMMCInstrInfo() {
32  MCInstrInfo *X = new MCInstrInfo();
33  InitARMMCInstrInfo(X);
34  return X;
35}
36
37MCRegisterInfo *createARMMCRegisterInfo() {
38  MCRegisterInfo *X = new MCRegisterInfo();
39  InitARMMCRegisterInfo(X);
40  return X;
41}
42
43MCSubtargetInfo *createARMMCSubtargetInfo(StringRef TT, StringRef CPU,
44                                          StringRef FS) {
45  MCSubtargetInfo *X = new MCSubtargetInfo();
46  InitARMMCSubtargetInfo(X, CPU, FS);
47  return X;
48}
49
50// Force static initialization.
51extern "C" void LLVMInitializeARMMCInstrInfo() {
52  RegisterMCInstrInfo<MCInstrInfo> X(TheARMTarget);
53  RegisterMCInstrInfo<MCInstrInfo> Y(TheThumbTarget);
54
55  TargetRegistry::RegisterMCInstrInfo(TheARMTarget, createARMMCInstrInfo);
56  TargetRegistry::RegisterMCInstrInfo(TheThumbTarget, createARMMCInstrInfo);
57}
58
59extern "C" void LLVMInitializeARMMCRegInfo() {
60  RegisterMCRegInfo<MCRegisterInfo> X(TheARMTarget);
61  RegisterMCRegInfo<MCRegisterInfo> Y(TheThumbTarget);
62
63  TargetRegistry::RegisterMCRegInfo(TheARMTarget, createARMMCRegisterInfo);
64  TargetRegistry::RegisterMCRegInfo(TheThumbTarget, createARMMCRegisterInfo);
65}
66
67extern "C" void LLVMInitializeARMMCSubtargetInfo() {
68  RegisterMCSubtargetInfo<MCSubtargetInfo> X(TheARMTarget);
69  RegisterMCSubtargetInfo<MCSubtargetInfo> Y(TheThumbTarget);
70
71  TargetRegistry::RegisterMCSubtargetInfo(TheARMTarget,
72                                          createARMMCSubtargetInfo);
73  TargetRegistry::RegisterMCSubtargetInfo(TheThumbTarget,
74                                          createARMMCSubtargetInfo);
75}
76
77std::string ARM_MC::ParseARMTriple(StringRef TT, bool &IsThumb) {
78  // Set the boolean corresponding to the current target triple, or the default
79  // if one cannot be determined, to true.
80  unsigned Len = TT.size();
81  unsigned Idx = 0;
82
83  if (Len >= 5 && TT.substr(0, 4) == "armv")
84    Idx = 4;
85  else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
86    IsThumb = true;
87    if (Len >= 7 && TT[5] == 'v')
88      Idx = 6;
89  }
90
91  std::string ARMArchFeature;
92  if (Idx) {
93    unsigned SubVer = TT[Idx];
94    if (SubVer >= '7' && SubVer <= '9') {
95      if (Len >= Idx+2 && TT[Idx+1] == 'm') {
96        // v7m: FeatureNoARM, FeatureDB, FeatureHWDiv
97        ARMArchFeature = "+v7,+noarm,+db,+hwdiv";
98      } else if (Len >= Idx+3 && TT[Idx+1] == 'e'&& TT[Idx+2] == 'm') {
99        // v7em: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureDSPThumb2,
100        //       FeatureT2XtPk
101        ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+t2dsp,t2xtpk";
102      } else
103        // v7a: FeatureNEON, FeatureDB, FeatureDSPThumb2
104        ARMArchFeature = "+v7,+neon,+db,+t2dsp";
105    } else if (SubVer == '6') {
106      if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
107        ARMArchFeature = "+v6t2";
108      else
109        ARMArchFeature = "+v6";
110    } else if (SubVer == '5') {
111      if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
112        ARMArchFeature = "+v5te";
113      else
114        ARMArchFeature = "+v5t";
115    } else if (SubVer == '4' && Len >= Idx+2 && TT[Idx+1] == 't')
116      ARMArchFeature = "+v4t";
117  }
118
119  return ARMArchFeature;
120}
121