lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp

   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
  33 using namespace llvm;
  34
  35 std::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
  89 MCSubtargetInfo *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
 104 static MCInstrInfo *createARMMCInstrInfo() {
 105   MCInstrInfo *X = new MCInstrInfo();
 106   InitARMMCInstrInfo(X);
 107   return X;
 108 }
 109
 110 static MCRegisterInfo *createARMMCRegisterInfo(StringRef Triple) {
 111   MCRegisterInfo *X = new MCRegisterInfo();
 112   InitARMMCRegisterInfo(X, ARM::LR);
 113   return X;
 114 }
 115
 116 static 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
 125 static 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.
 135 static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
 136                                     MCContext &Ctx, MCAsmBackend &MAB,
 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, MAB, 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, MAB, OS, Emitter, RelaxAll, NoExecStack);
 152 }
 153
 154 static 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.
 164 extern "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::RegisterMCAsmBackend(TheARMTarget, createARMAsmBackend);
 193   TargetRegistry::RegisterMCAsmBackend(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 }