ARMMCTargetDesc.cpp revision 4b64e8a9e13ba782da2034e1dee52f077bdb759c 
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 "InstPrinter/ARMInstPrinter.h"
17#include "llvm/MC/MCInstrInfo.h"
18#include "llvm/MC/MCRegisterInfo.h"
19#include "llvm/MC/MCStreamer.h"
20#include "llvm/MC/MCSubtargetInfo.h"
21#include "llvm/Target/TargetRegistry.h"
22#include "llvm/Support/ErrorHandling.h"
23
24#define GET_REGINFO_MC_DESC
25#include "ARMGenRegisterInfo.inc"
26
27#define GET_INSTRINFO_MC_DESC
28#include "ARMGenInstrInfo.inc"
29
30#define GET_SUBTARGETINFO_MC_DESC
31#include "ARMGenSubtargetInfo.inc"
32
33using namespace llvm;
34
35std::string ARM_MC::ParseARMTriple(StringRef TT) {
36  // Set the boolean corresponding to the current target triple, or the default
37  // if one cannot be determined, to true.
38  unsigned Len = TT.size();
39  unsigned Idx = 0;
40
41  // FIXME: Enahnce Triple helper class to extract ARM version.
42  bool isThumb = false;
43  if (Len >= 5 && TT.substr(0, 4) == "armv")
44    Idx = 4;
45  else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
46    isThumb = true;
47    if (Len >= 7 && TT[5] == 'v')
48      Idx = 6;
49  }
50
51  std::string ARMArchFeature;
52  if (Idx) {
53    unsigned SubVer = TT[Idx];
54    if (SubVer >= '7' && SubVer <= '9') {
55      if (Len >= Idx+2 && TT[Idx+1] == 'm') {
56        // v7m: FeatureNoARM, FeatureDB, FeatureHWDiv
57        ARMArchFeature = "+v7,+noarm,+db,+hwdiv";
58      } else if (Len >= Idx+3 && TT[Idx+1] == 'e'&& TT[Idx+2] == 'm') {
59        // v7em: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureDSPThumb2,
60        //       FeatureT2XtPk
61        ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+t2dsp,t2xtpk";
62      } else
63        // v7a: FeatureNEON, FeatureDB, FeatureDSPThumb2
64        ARMArchFeature = "+v7,+neon,+db,+t2dsp";
65    } else if (SubVer == '6') {
66      if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
67        ARMArchFeature = "+v6t2";
68      else
69        ARMArchFeature = "+v6";
70    } else if (SubVer == '5') {
71      if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
72        ARMArchFeature = "+v5te";
73      else
74        ARMArchFeature = "+v5t";
75    } else if (SubVer == '4' && Len >= Idx+2 && TT[Idx+1] == 't')
76      ARMArchFeature = "+v4t";
77  }
78
79  if (isThumb) {
80    if (ARMArchFeature.empty())
81      ARMArchFeature = "+thumb-mode";
82    else
83      ARMArchFeature += ",+thumb-mode";
84  }
85
86  return ARMArchFeature;
87}
88
89MCSubtargetInfo *ARM_MC::createARMMCSubtargetInfo(StringRef TT, StringRef CPU,
90                                                  StringRef FS) {
91  std::string ArchFS = ARM_MC::ParseARMTriple(TT);
92  if (!FS.empty()) {
93    if (!ArchFS.empty())
94      ArchFS = ArchFS + "," + FS.str();
95    else
96      ArchFS = FS;
97  }
98
99  MCSubtargetInfo *X = new MCSubtargetInfo();
100  InitARMMCSubtargetInfo(X, TT, CPU, ArchFS);
101  return X;
102}
103
104static MCInstrInfo *createARMMCInstrInfo() {
105  MCInstrInfo *X = new MCInstrInfo();
106  InitARMMCInstrInfo(X);
107  return X;
108}
109
110static MCRegisterInfo *createARMMCRegisterInfo(StringRef Triple) {
111  MCRegisterInfo *X = new MCRegisterInfo();
112  InitARMMCRegisterInfo(X, ARM::LR);
113  return X;
114}
115
116static MCAsmInfo *createARMMCAsmInfo(const Target &T, StringRef TT) {
117  Triple TheTriple(TT);
118
119  if (TheTriple.isOSDarwin())
120    return new ARMMCAsmInfoDarwin();
121
122  return new ARMELFMCAsmInfo();
123}
124
125static MCCodeGenInfo *createARMMCCodeGenInfo(StringRef TT, Reloc::Model RM,
126                                             CodeModel::Model CM) {
127  MCCodeGenInfo *X = new MCCodeGenInfo();
128  if (RM == Reloc::Default)
129    RM = Reloc::DynamicNoPIC;
130  X->InitMCCodeGenInfo(RM, CM);
131  return X;
132}
133
134// This is duplicated code. Refactor this.
135static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
136                                    MCContext &Ctx, TargetAsmBackend &TAB,
137                                    raw_ostream &OS,
138                                    MCCodeEmitter *Emitter,
139                                    bool RelaxAll,
140                                    bool NoExecStack) {
141  Triple TheTriple(TT);
142
143  if (TheTriple.isOSDarwin())
144    return createMachOStreamer(Ctx, TAB, OS, Emitter, RelaxAll);
145
146  if (TheTriple.isOSWindows()) {
147    llvm_unreachable("ARM does not support Windows COFF format");
148    return NULL;
149  }
150
151  return createELFStreamer(Ctx, TAB, OS, Emitter, RelaxAll, NoExecStack);
152}
153
154static MCInstPrinter *createARMMCInstPrinter(const Target &T,
155                                             unsigned SyntaxVariant,
156                                             const MCAsmInfo &MAI) {
157  if (SyntaxVariant == 0)
158    return new ARMInstPrinter(MAI);
159  return 0;
160}
161
162
163// Force static initialization.
164extern "C" void LLVMInitializeARMTargetMC() {
165  // Register the MC asm info.
166  RegisterMCAsmInfoFn A(TheARMTarget, createARMMCAsmInfo);
167  RegisterMCAsmInfoFn B(TheThumbTarget, createARMMCAsmInfo);
168
169  // Register the MC codegen info.
170  TargetRegistry::RegisterMCCodeGenInfo(TheARMTarget, createARMMCCodeGenInfo);
171  TargetRegistry::RegisterMCCodeGenInfo(TheThumbTarget, createARMMCCodeGenInfo);
172
173  // Register the MC instruction info.
174  TargetRegistry::RegisterMCInstrInfo(TheARMTarget, createARMMCInstrInfo);
175  TargetRegistry::RegisterMCInstrInfo(TheThumbTarget, createARMMCInstrInfo);
176
177  // Register the MC register info.
178  TargetRegistry::RegisterMCRegInfo(TheARMTarget, createARMMCRegisterInfo);
179  TargetRegistry::RegisterMCRegInfo(TheThumbTarget, createARMMCRegisterInfo);
180
181  // Register the MC subtarget info.
182  TargetRegistry::RegisterMCSubtargetInfo(TheARMTarget,
183                                          ARM_MC::createARMMCSubtargetInfo);
184  TargetRegistry::RegisterMCSubtargetInfo(TheThumbTarget,
185                                          ARM_MC::createARMMCSubtargetInfo);
186
187  // Register the MC Code Emitter
188  TargetRegistry::RegisterCodeEmitter(TheARMTarget, createARMMCCodeEmitter);
189  TargetRegistry::RegisterCodeEmitter(TheThumbTarget, createARMMCCodeEmitter);
190
191  // Register the asm backend.
192  TargetRegistry::RegisterAsmBackend(TheARMTarget, createARMAsmBackend);
193  TargetRegistry::RegisterAsmBackend(TheThumbTarget, createARMAsmBackend);
194
195  // Register the object streamer.
196  TargetRegistry::RegisterObjectStreamer(TheARMTarget, createMCStreamer);
197  TargetRegistry::RegisterObjectStreamer(TheThumbTarget, createMCStreamer);
198
199  // Register the MCInstPrinter.
200  TargetRegistry::RegisterMCInstPrinter(TheARMTarget, createARMMCInstPrinter);
201  TargetRegistry::RegisterMCInstPrinter(TheThumbTarget, createARMMCInstPrinter);
202}
203