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_MC_DESC
  27 #include "ARMGenSubtargetInfo.inc"
  28
  29 using namespace llvm;
  30
  31 MCInstrInfo *createARMMCInstrInfo() {
  32   MCInstrInfo *X = new MCInstrInfo();
  33   InitARMMCInstrInfo(X);
  34   return X;
  35 }
  36
  37 MCRegisterInfo *createARMMCRegisterInfo() {
  38   MCRegisterInfo *X = new MCRegisterInfo();
  39   InitARMMCRegisterInfo(X);
  40   return X;
  41 }
  42
  43 MCSubtargetInfo *createARMMCSubtargetInfo(StringRef TT, StringRef CPU,
  44                                           StringRef FS) {
  45   std::string ArchFS = ARM_MC::ParseARMTriple(TT);
  46   if (!FS.empty()) {
  47     if (!ArchFS.empty())
  48       ArchFS = ArchFS + "," + FS.str();
  49     else
  50       ArchFS = FS;
  51   }
  52
  53   MCSubtargetInfo *X = new MCSubtargetInfo();
  54   InitARMMCSubtargetInfo(X, CPU, ArchFS);
  55   return X;
  56 }
  57
  58 // Force static initialization.
  59 extern "C" void LLVMInitializeARMMCInstrInfo() {
  60   RegisterMCInstrInfo<MCInstrInfo> X(TheARMTarget);
  61   RegisterMCInstrInfo<MCInstrInfo> Y(TheThumbTarget);
  62
  63   TargetRegistry::RegisterMCInstrInfo(TheARMTarget, createARMMCInstrInfo);
  64   TargetRegistry::RegisterMCInstrInfo(TheThumbTarget, createARMMCInstrInfo);
  65 }
  66
  67 extern "C" void LLVMInitializeARMMCRegInfo() {
  68   RegisterMCRegInfo<MCRegisterInfo> X(TheARMTarget);
  69   RegisterMCRegInfo<MCRegisterInfo> Y(TheThumbTarget);
  70
  71   TargetRegistry::RegisterMCRegInfo(TheARMTarget, createARMMCRegisterInfo);
  72   TargetRegistry::RegisterMCRegInfo(TheThumbTarget, createARMMCRegisterInfo);
  73 }
  74
  75 extern "C" void LLVMInitializeARMMCSubtargetInfo() {
  76   RegisterMCSubtargetInfo<MCSubtargetInfo> X(TheARMTarget);
  77   RegisterMCSubtargetInfo<MCSubtargetInfo> Y(TheThumbTarget);
  78
  79   TargetRegistry::RegisterMCSubtargetInfo(TheARMTarget,
  80                                           createARMMCSubtargetInfo);
  81   TargetRegistry::RegisterMCSubtargetInfo(TheThumbTarget,
  82                                           createARMMCSubtargetInfo);
  83 }
  84
  85 std::string ARM_MC::ParseARMTriple(StringRef TT) {
  86   // Set the boolean corresponding to the current target triple, or the default
  87   // if one cannot be determined, to true.
  88   unsigned Len = TT.size();
  89   unsigned Idx = 0;
  90
  91   // FIXME: Enahnce Triple helper class to extract ARM version.
  92   bool isThumb = false;
  93   if (Len >= 5 && TT.substr(0, 4) == "armv")
  94     Idx = 4;
  95   else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
  96     isThumb = true;
  97     if (Len >= 7 && TT[5] == 'v')
  98       Idx = 6;
  99   }
 100
 101   std::string ARMArchFeature;
 102   if (Idx) {
 103     unsigned SubVer = TT[Idx];
 104     if (SubVer >= '7' && SubVer <= '9') {
 105       if (Len >= Idx+2 && TT[Idx+1] == 'm') {
 106         // v7m: FeatureNoARM, FeatureDB, FeatureHWDiv
 107         ARMArchFeature = "+v7,+noarm,+db,+hwdiv";
 108       } else if (Len >= Idx+3 && TT[Idx+1] == 'e'&& TT[Idx+2] == 'm') {
 109         // v7em: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureDSPThumb2,
 110         //       FeatureT2XtPk
 111         ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+t2dsp,t2xtpk";
 112       } else
 113         // v7a: FeatureNEON, FeatureDB, FeatureDSPThumb2
 114         ARMArchFeature = "+v7,+neon,+db,+t2dsp";
 115     } else if (SubVer == '6') {
 116       if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
 117         ARMArchFeature = "+v6t2";
 118       else
 119         ARMArchFeature = "+v6";
 120     } else if (SubVer == '5') {
 121       if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
 122         ARMArchFeature = "+v5te";
 123       else
 124         ARMArchFeature = "+v5t";
 125     } else if (SubVer == '4' && Len >= Idx+2 && TT[Idx+1] == 't')
 126       ARMArchFeature = "+v4t";
 127   }
 128
 129   if (isThumb) {
 130     if (ARMArchFeature.empty())
 131       ARMArchFeature = "+thumb-mode";
 132     else
 133       ARMArchFeature += ",+thumb-mode";
 134   }
 135
 136   return ARMArchFeature;
 137 }