ARMMCTargetDesc.cpp revision e76a33b9567d78a5744dc52fcec3a6056d6fb576 
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 "ARMMCAsmInfo.h"
16#include "llvm/MC/MCInstrInfo.h"
17#include "llvm/MC/MCRegisterInfo.h"
18#include "llvm/MC/MCSubtargetInfo.h"
19#include "llvm/Target/TargetRegistry.h"
20
21#define GET_REGINFO_MC_DESC
22#include "ARMGenRegisterInfo.inc"
23
24#define GET_INSTRINFO_MC_DESC
25#include "ARMGenInstrInfo.inc"
26
27#define GET_SUBTARGETINFO_MC_DESC
28#include "ARMGenSubtargetInfo.inc"
29
30using namespace llvm;
31
32std::string ARM_MC::ParseARMTriple(StringRef TT) {
33  // Set the boolean corresponding to the current target triple, or the default
34  // if one cannot be determined, to true.
35  unsigned Len = TT.size();
36  unsigned Idx = 0;
37
38  // FIXME: Enahnce Triple helper class to extract ARM version.
39  bool isThumb = false;
40  if (Len >= 5 && TT.substr(0, 4) == "armv")
41    Idx = 4;
42  else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
43    isThumb = true;
44    if (Len >= 7 && TT[5] == 'v')
45      Idx = 6;
46  }
47
48  std::string ARMArchFeature;
49  if (Idx) {
50    unsigned SubVer = TT[Idx];
51    if (SubVer >= '7' && SubVer <= '9') {
52      if (Len >= Idx+2 && TT[Idx+1] == 'm') {
53        // v7m: FeatureNoARM, FeatureDB, FeatureHWDiv
54        ARMArchFeature = "+v7,+noarm,+db,+hwdiv";
55      } else if (Len >= Idx+3 && TT[Idx+1] == 'e'&& TT[Idx+2] == 'm') {
56        // v7em: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureDSPThumb2,
57        //       FeatureT2XtPk
58        ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+t2dsp,t2xtpk";
59      } else
60        // v7a: FeatureNEON, FeatureDB, FeatureDSPThumb2
61        ARMArchFeature = "+v7,+neon,+db,+t2dsp";
62    } else if (SubVer == '6') {
63      if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
64        ARMArchFeature = "+v6t2";
65      else
66        ARMArchFeature = "+v6";
67    } else if (SubVer == '5') {
68      if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
69        ARMArchFeature = "+v5te";
70      else
71        ARMArchFeature = "+v5t";
72    } else if (SubVer == '4' && Len >= Idx+2 && TT[Idx+1] == 't')
73      ARMArchFeature = "+v4t";
74  }
75
76  if (isThumb) {
77    if (ARMArchFeature.empty())
78      ARMArchFeature = "+thumb-mode";
79    else
80      ARMArchFeature += ",+thumb-mode";
81  }
82
83  return ARMArchFeature;
84}
85
86MCSubtargetInfo *ARM_MC::createARMMCSubtargetInfo(StringRef TT, StringRef CPU,
87                                                  StringRef FS) {
88  std::string ArchFS = ARM_MC::ParseARMTriple(TT);
89  if (!FS.empty()) {
90    if (!ArchFS.empty())
91      ArchFS = ArchFS + "," + FS.str();
92    else
93      ArchFS = FS;
94  }
95
96  MCSubtargetInfo *X = new MCSubtargetInfo();
97  InitARMMCSubtargetInfo(X, TT, CPU, ArchFS);
98  return X;
99}
100
101// Force static initialization.
102extern "C" void LLVMInitializeARMMCSubtargetInfo() {
103  TargetRegistry::RegisterMCSubtargetInfo(TheARMTarget,
104                                          ARM_MC::createARMMCSubtargetInfo);
105  TargetRegistry::RegisterMCSubtargetInfo(TheThumbTarget,
106                                          ARM_MC::createARMMCSubtargetInfo);
107}
108
109static MCInstrInfo *createARMMCInstrInfo() {
110  MCInstrInfo *X = new MCInstrInfo();
111  InitARMMCInstrInfo(X);
112  return X;
113}
114
115extern "C" void LLVMInitializeARMMCInstrInfo() {
116  TargetRegistry::RegisterMCInstrInfo(TheARMTarget, createARMMCInstrInfo);
117  TargetRegistry::RegisterMCInstrInfo(TheThumbTarget, createARMMCInstrInfo);
118}
119
120static MCRegisterInfo *createARMMCRegisterInfo(StringRef Triple) {
121  MCRegisterInfo *X = new MCRegisterInfo();
122  InitARMMCRegisterInfo(X, ARM::LR);
123  return X;
124}
125
126extern "C" void LLVMInitializeARMMCRegisterInfo() {
127  TargetRegistry::RegisterMCRegInfo(TheARMTarget, createARMMCRegisterInfo);
128  TargetRegistry::RegisterMCRegInfo(TheThumbTarget, createARMMCRegisterInfo);
129}
130
131static MCAsmInfo *createARMMCAsmInfo(const Target &T, StringRef TT) {
132  Triple TheTriple(TT);
133
134  if (TheTriple.isOSDarwin())
135    return new ARMMCAsmInfoDarwin();
136
137  return new ARMELFMCAsmInfo();
138}
139
140extern "C" void LLVMInitializeARMMCAsmInfo() {
141  // Register the target asm info.
142  RegisterMCAsmInfoFn A(TheARMTarget, createARMMCAsmInfo);
143  RegisterMCAsmInfoFn B(TheThumbTarget, createARMMCAsmInfo);
144}
145
146MCCodeGenInfo *createARMMCCodeGenInfo(StringRef TT, Reloc::Model RM) {
147  MCCodeGenInfo *X = new MCCodeGenInfo();
148  if (RM == Reloc::Default)
149    RM = Reloc::DynamicNoPIC;
150  X->InitMCCodeGenInfo(RM);
151  return X;
152}
153
154extern "C" void LLVMInitializeARMMCCodeGenInfo() {
155  TargetRegistry::RegisterMCCodeGenInfo(TheARMTarget, createARMMCCodeGenInfo);
156  TargetRegistry::RegisterMCCodeGenInfo(TheThumbTarget, createARMMCCodeGenInfo);
157}
158