lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp

   1 //===-- AArch64MCTargetDesc.cpp - AArch64 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 AArch64 specific target descriptions.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "AArch64MCTargetDesc.h"
  15 #include "AArch64ELFStreamer.h"
  16 #include "AArch64MCAsmInfo.h"
  17 #include "InstPrinter/AArch64InstPrinter.h"
  18 #include "llvm/MC/MCCodeGenInfo.h"
  19 #include "llvm/MC/MCInstrInfo.h"
  20 #include "llvm/MC/MCRegisterInfo.h"
  21 #include "llvm/MC/MCStreamer.h"
  22 #include "llvm/MC/MCSubtargetInfo.h"
  23 #include "llvm/Support/ErrorHandling.h"
  24 #include "llvm/Support/TargetRegistry.h"
  25
  26 using namespace llvm;
  27
  28 #define GET_INSTRINFO_MC_DESC
  29 #include "AArch64GenInstrInfo.inc"
  30
  31 #define GET_SUBTARGETINFO_MC_DESC
  32 #include "AArch64GenSubtargetInfo.inc"
  33
  34 #define GET_REGINFO_MC_DESC
  35 #include "AArch64GenRegisterInfo.inc"
  36
  37 static MCInstrInfo *createAArch64MCInstrInfo() {
  38   MCInstrInfo *X = new MCInstrInfo();
  39   InitAArch64MCInstrInfo(X);
  40   return X;
  41 }
  42
  43 static MCSubtargetInfo *
  44 createAArch64MCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS) {
  45   MCSubtargetInfo *X = new MCSubtargetInfo();
  46
  47   if (CPU.empty())
  48     CPU = "generic";
  49
  50   InitAArch64MCSubtargetInfo(X, TT, CPU, FS);
  51   return X;
  52 }
  53
  54 static MCRegisterInfo *createAArch64MCRegisterInfo(StringRef Triple) {
  55   MCRegisterInfo *X = new MCRegisterInfo();
  56   InitAArch64MCRegisterInfo(X, AArch64::LR);
  57   return X;
  58 }
  59
  60 static MCAsmInfo *createAArch64MCAsmInfo(const MCRegisterInfo &MRI,
  61                                          StringRef TT) {
  62   Triple TheTriple(TT);
  63
  64   MCAsmInfo *MAI;
  65   if (TheTriple.isOSDarwin())
  66     MAI = new AArch64MCAsmInfoDarwin();
  67   else {
  68     assert(TheTriple.isOSBinFormatELF() && "Only expect Darwin or ELF");
  69     MAI = new AArch64MCAsmInfoELF(TT);
  70   }
  71
  72   // Initial state of the frame pointer is SP.
  73   unsigned Reg = MRI.getDwarfRegNum(AArch64::SP, true);
  74   MCCFIInstruction Inst = MCCFIInstruction::createDefCfa(nullptr, Reg, 0);
  75   MAI->addInitialFrameState(Inst);
  76
  77   return MAI;
  78 }
  79
  80 static MCCodeGenInfo *createAArch64MCCodeGenInfo(StringRef TT, Reloc::Model RM,
  81                                                  CodeModel::Model CM,
  82                                                  CodeGenOpt::Level OL) {
  83   Triple TheTriple(TT);
  84   assert((TheTriple.isOSBinFormatELF() || TheTriple.isOSBinFormatMachO()) &&
  85          "Only expect Darwin and ELF targets");
  86
  87   if (CM == CodeModel::Default)
  88     CM = CodeModel::Small;
  89   // The default MCJIT memory managers make no guarantees about where they can
  90   // find an executable page; JITed code needs to be able to refer to globals
  91   // no matter how far away they are.
  92   else if (CM == CodeModel::JITDefault)
  93     CM = CodeModel::Large;
  94   else if (CM != CodeModel::Small && CM != CodeModel::Large)
  95     report_fatal_error(
  96         "Only small and large code models are allowed on AArch64");
  97
  98   // AArch64 Darwin is always PIC.
  99   if (TheTriple.isOSDarwin())
 100     RM = Reloc::PIC_;
 101   // On ELF platforms the default static relocation model has a smart enough
 102   // linker to cope with referencing external symbols defined in a shared
 103   // library. Hence DynamicNoPIC doesn't need to be promoted to PIC.
 104   else if (RM == Reloc::Default || RM == Reloc::DynamicNoPIC)
 105     RM = Reloc::Static;
 106
 107   MCCodeGenInfo *X = new MCCodeGenInfo();
 108   X->InitMCCodeGenInfo(RM, CM, OL);
 109   return X;
 110 }
 111
 112 static MCInstPrinter *createAArch64MCInstPrinter(const Triple &T,
 113                                                  unsigned SyntaxVariant,
 114                                                  const MCAsmInfo &MAI,
 115                                                  const MCInstrInfo &MII,
 116                                                  const MCRegisterInfo &MRI) {
 117   if (SyntaxVariant == 0)
 118     return new AArch64InstPrinter(MAI, MII, MRI);
 119   if (SyntaxVariant == 1)
 120     return new AArch64AppleInstPrinter(MAI, MII, MRI);
 121
 122   return nullptr;
 123 }
 124
 125 static MCStreamer *createELFStreamer(const Triple &T, MCContext &Ctx,
 126                                      MCAsmBackend &TAB, raw_pwrite_stream &OS,
 127                                      MCCodeEmitter *Emitter, bool RelaxAll) {
 128   return createAArch64ELFStreamer(Ctx, TAB, OS, Emitter, RelaxAll);
 129 }
 130
 131 static MCStreamer *createMachOStreamer(MCContext &Ctx, MCAsmBackend &TAB,
 132                                        raw_pwrite_stream &OS,
 133                                        MCCodeEmitter *Emitter, bool RelaxAll,
 134                                        bool DWARFMustBeAtTheEnd) {
 135   return createMachOStreamer(Ctx, TAB, OS, Emitter, RelaxAll,
 136                              DWARFMustBeAtTheEnd,
 137                              /*LabelSections*/ true);
 138 }
 139
 140 // Force static initialization.
 141 extern "C" void LLVMInitializeAArch64TargetMC() {
 142   for (Target *T :
 143        {&TheAArch64leTarget, &TheAArch64beTarget, &TheARM64Target}) {
 144     // Register the MC asm info.
 145     RegisterMCAsmInfoFn X(*T, createAArch64MCAsmInfo);
 146
 147     // Register the MC codegen info.
 148     TargetRegistry::RegisterMCCodeGenInfo(*T, createAArch64MCCodeGenInfo);
 149
 150     // Register the MC instruction info.
 151     TargetRegistry::RegisterMCInstrInfo(*T, createAArch64MCInstrInfo);
 152
 153     // Register the MC register info.
 154     TargetRegistry::RegisterMCRegInfo(*T, createAArch64MCRegisterInfo);
 155
 156     // Register the MC subtarget info.
 157     TargetRegistry::RegisterMCSubtargetInfo(*T, createAArch64MCSubtargetInfo);
 158
 159     // Register the MC Code Emitter
 160     TargetRegistry::RegisterMCCodeEmitter(*T, createAArch64MCCodeEmitter);
 161
 162     // Register the obj streamers.
 163     TargetRegistry::RegisterELFStreamer(*T, createELFStreamer);
 164     TargetRegistry::RegisterMachOStreamer(*T, createMachOStreamer);
 165
 166     // Register the obj target streamer.
 167     TargetRegistry::RegisterObjectTargetStreamer(
 168         *T, createAArch64ObjectTargetStreamer);
 169
 170     // Register the asm streamer.
 171     TargetRegistry::RegisterAsmTargetStreamer(*T,
 172                                               createAArch64AsmTargetStreamer);
 173     // Register the MCInstPrinter.
 174     TargetRegistry::RegisterMCInstPrinter(*T, createAArch64MCInstPrinter);
 175   }
 176
 177   // Register the asm backend.
 178   for (Target *T : {&TheAArch64leTarget, &TheARM64Target})
 179     TargetRegistry::RegisterMCAsmBackend(*T, createAArch64leAsmBackend);
 180   TargetRegistry::RegisterMCAsmBackend(TheAArch64beTarget,
 181                                        createAArch64beAsmBackend);
 182 }