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 "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
  30 using namespace llvm;
  31
  32 std::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
  86 MCSubtargetInfo *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, CPU, ArchFS);
  98   return X;
  99 }
 100
 101 MCInstrInfo *createARMMCInstrInfo() {
 102   MCInstrInfo *X = new MCInstrInfo();
 103   InitARMMCInstrInfo(X);
 104   return X;
 105 }
 106
 107 MCRegisterInfo *createARMMCRegisterInfo() {
 108   MCRegisterInfo *X = new MCRegisterInfo();
 109   InitARMMCRegisterInfo(X);
 110   return X;
 111 }
 112
 113 // Force static initialization.
 114 extern "C" void LLVMInitializeARMMCInstrInfo() {
 115   TargetRegistry::RegisterMCInstrInfo(TheARMTarget, createARMMCInstrInfo);
 116   TargetRegistry::RegisterMCInstrInfo(TheThumbTarget, createARMMCInstrInfo);
 117 }
 118
 119 extern "C" void LLVMInitializeARMMCRegInfo() {
 120   TargetRegistry::RegisterMCRegInfo(TheARMTarget, createARMMCRegisterInfo);
 121   TargetRegistry::RegisterMCRegInfo(TheThumbTarget, createARMMCRegisterInfo);
 122 }
 123
 124 extern "C" void LLVMInitializeARMMCSubtargetInfo() {
 125   TargetRegistry::RegisterMCSubtargetInfo(TheARMTarget,
 126                                           ARM_MC::createARMMCSubtargetInfo);
 127   TargetRegistry::RegisterMCSubtargetInfo(TheThumbTarget,
 128                                           ARM_MC::createARMMCSubtargetInfo);
 129 }