ARMMCTargetDesc.cpp revision 59ee62d2418df8db499eca1ae17f5900dc2dcbba 
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_ENUM
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
101MCInstrInfo *createARMMCInstrInfo() {
102  MCInstrInfo *X = new MCInstrInfo();
103  InitARMMCInstrInfo(X);
104  return X;
105}
106
107MCRegisterInfo *createARMMCRegisterInfo() {
108  MCRegisterInfo *X = new MCRegisterInfo();
109  InitARMMCRegisterInfo(X);
110  return X;
111}
112
113// Force static initialization.
114extern "C" void LLVMInitializeARMMCInstrInfo() {
115  TargetRegistry::RegisterMCInstrInfo(TheARMTarget, createARMMCInstrInfo);
116  TargetRegistry::RegisterMCInstrInfo(TheThumbTarget, createARMMCInstrInfo);
117}
118
119extern "C" void LLVMInitializeARMMCRegInfo() {
120  TargetRegistry::RegisterMCRegInfo(TheARMTarget, createARMMCRegisterInfo);
121  TargetRegistry::RegisterMCRegInfo(TheThumbTarget, createARMMCRegisterInfo);
122}
123
124extern "C" void LLVMInitializeARMMCSubtargetInfo() {
125  TargetRegistry::RegisterMCSubtargetInfo(TheARMTarget,
126                                          ARM_MC::createARMMCSubtargetInfo);
127  TargetRegistry::RegisterMCSubtargetInfo(TheThumbTarget,
128                                          ARM_MC::createARMMCSubtargetInfo);
129}
130