lib/Target/X86/X86TargetMachine.cpp

   1 //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
   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 defines the X86 specific subclass of TargetMachine.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "X86MCAsmInfo.h"
  15 #include "X86TargetMachine.h"
  16 #include "X86.h"
  17 #include "llvm/PassManager.h"
  18 #include "llvm/CodeGen/MachineFunction.h"
  19 #include "llvm/CodeGen/Passes.h"
  20 #include "llvm/MC/MCCodeEmitter.h"
  21 #include "llvm/MC/MCStreamer.h"
  22 #include "llvm/Support/FormattedStream.h"
  23 #include "llvm/Target/TargetOptions.h"
  24 #include "llvm/Target/TargetRegistry.h"
  25 using namespace llvm;
  26
  27 static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
  28   Triple TheTriple(TT);
  29
  30   if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO) {
  31     if (TheTriple.getArch() == Triple::x86_64)
  32       return new X86_64MCAsmInfoDarwin(TheTriple);
  33     else
  34       return new X86MCAsmInfoDarwin(TheTriple);
  35   }
  36
  37   if (TheTriple.isOSWindows())
  38     return new X86MCAsmInfoCOFF(TheTriple);
  39
  40   return new X86ELFMCAsmInfo(TheTriple);
  41 }
  42
  43 static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
  44                                     MCContext &Ctx, TargetAsmBackend &TAB,
  45                                     raw_ostream &_OS,
  46                                     MCCodeEmitter *_Emitter,
  47                                     bool RelaxAll,
  48                                     bool NoExecStack) {
  49   Triple TheTriple(TT);
  50
  51   if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO)
  52     return createMachOStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll);
  53
  54   if (TheTriple.isOSWindows())
  55     return createWinCOFFStreamer(Ctx, TAB, *_Emitter, _OS, RelaxAll);
  56
  57   return createELFStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll, NoExecStack);
  58 }
  59
  60 extern "C" void LLVMInitializeX86Target() {
  61   // Register the target.
  62   RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
  63   RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
  64
  65   // Register the target asm info.
  66   RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo);
  67   RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo);
  68
  69   // Register the code emitter.
  70   TargetRegistry::RegisterCodeEmitter(TheX86_32Target,
  71                                       createX86_32MCCodeEmitter);
  72   TargetRegistry::RegisterCodeEmitter(TheX86_64Target,
  73                                       createX86_64MCCodeEmitter);
  74
  75   // Register the asm backend.
  76   TargetRegistry::RegisterAsmBackend(TheX86_32Target,
  77                                      createX86_32AsmBackend);
  78   TargetRegistry::RegisterAsmBackend(TheX86_64Target,
  79                                      createX86_64AsmBackend);
  80
  81   // Register the object streamer.
  82   TargetRegistry::RegisterObjectStreamer(TheX86_32Target,
  83                                          createMCStreamer);
  84   TargetRegistry::RegisterObjectStreamer(TheX86_64Target,
  85                                          createMCStreamer);
  86 }
  87
  88
  89 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
  90                                          const std::string &FS)
  91   : X86TargetMachine(T, TT, FS, false),
  92     DataLayout(getSubtargetImpl()->isTargetDarwin() ?
  93                "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-f128:128:128-n8:16:32" :
  94                (getSubtargetImpl()->isTargetCygMing() ||
  95                 getSubtargetImpl()->isTargetWindows()) ?
  96                "e-p:32:32-f64:64:64-i64:64:64-f80:32:32-f128:128:128-n8:16:32" :
  97                "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-f128:128:128-n8:16:32"),
  98     InstrInfo(*this),
  99     TSInfo(*this),
 100     TLInfo(*this),
 101     JITInfo(*this) {
 102 }
 103
 104
 105 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
 106                                          const std::string &FS)
 107   : X86TargetMachine(T, TT, FS, true),
 108     DataLayout("e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-f128:128:128-n8:16:32:64"),
 109     InstrInfo(*this),
 110     TSInfo(*this),
 111     TLInfo(*this),
 112     JITInfo(*this) {
 113 }
 114
 115 /// X86TargetMachine ctor - Create an X86 target.
 116 ///
 117 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
 118                                    const std::string &FS, bool is64Bit)
 119   : LLVMTargetMachine(T, TT),
 120     Subtarget(TT, FS, is64Bit, StackAlignment),
 121     FrameLowering(*this, Subtarget),
 122     ELFWriterInfo(is64Bit, true) {
 123   DefRelocModel = getRelocationModel();
 124
 125   // If no relocation model was picked, default as appropriate for the target.
 126   if (getRelocationModel() == Reloc::Default) {
 127     // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode.
 128     // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we
 129     // use static relocation model by default.
 130     if (Subtarget.isTargetDarwin()) {
 131       if (Subtarget.is64Bit())
 132         setRelocationModel(Reloc::PIC_);
 133       else
 134         setRelocationModel(Reloc::DynamicNoPIC);
 135     } else if (Subtarget.isTargetWin64())
 136       setRelocationModel(Reloc::PIC_);
 137     else
 138       setRelocationModel(Reloc::Static);
 139   }
 140
 141   assert(getRelocationModel() != Reloc::Default &&
 142          "Relocation mode not picked");
 143
 144   // ELF and X86-64 don't have a distinct DynamicNoPIC model.  DynamicNoPIC
 145   // is defined as a model for code which may be used in static or dynamic
 146   // executables but not necessarily a shared library. On X86-32 we just
 147   // compile in -static mode, in x86-64 we use PIC.
 148   if (getRelocationModel() == Reloc::DynamicNoPIC) {
 149     if (is64Bit)
 150       setRelocationModel(Reloc::PIC_);
 151     else if (!Subtarget.isTargetDarwin())
 152       setRelocationModel(Reloc::Static);
 153   }
 154
 155   // If we are on Darwin, disallow static relocation model in X86-64 mode, since
 156   // the Mach-O file format doesn't support it.
 157   if (getRelocationModel() == Reloc::Static &&
 158       Subtarget.isTargetDarwin() &&
 159       is64Bit)
 160     setRelocationModel(Reloc::PIC_);
 161
 162   // Determine the PICStyle based on the target selected.
 163   if (getRelocationModel() == Reloc::Static) {
 164     // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
 165     Subtarget.setPICStyle(PICStyles::None);
 166   } else if (Subtarget.is64Bit()) {
 167     // PIC in 64 bit mode is always rip-rel.
 168     Subtarget.setPICStyle(PICStyles::RIPRel);
 169   } else if (Subtarget.isTargetCygMing()) {
 170     Subtarget.setPICStyle(PICStyles::None);
 171   } else if (Subtarget.isTargetDarwin()) {
 172     if (getRelocationModel() == Reloc::PIC_)
 173       Subtarget.setPICStyle(PICStyles::StubPIC);
 174     else {
 175       assert(getRelocationModel() == Reloc::DynamicNoPIC);
 176       Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
 177     }
 178   } else if (Subtarget.isTargetELF()) {
 179     Subtarget.setPICStyle(PICStyles::GOT);
 180   }
 181
 182   // Finally, if we have "none" as our PIC style, force to static mode.
 183   if (Subtarget.getPICStyle() == PICStyles::None)
 184     setRelocationModel(Reloc::Static);
 185
 186   // default to hard float ABI
 187   if (FloatABIType == FloatABI::Default)
 188     FloatABIType = FloatABI::Hard;
 189 }
 190
 191 //===----------------------------------------------------------------------===//
 192 // Pass Pipeline Configuration
 193 //===----------------------------------------------------------------------===//
 194
 195 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
 196                                        CodeGenOpt::Level OptLevel) {
 197   // Install an instruction selector.
 198   PM.add(createX86ISelDag(*this, OptLevel));
 199
 200   // For 32-bit, prepend instructions to set the "global base reg" for PIC.
 201   if (!Subtarget.is64Bit())
 202     PM.add(createGlobalBaseRegPass());
 203
 204   return false;
 205 }
 206
 207 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
 208                                       CodeGenOpt::Level OptLevel) {
 209   PM.add(createX86MaxStackAlignmentHeuristicPass());
 210   return false;  // -print-machineinstr shouldn't print after this.
 211 }
 212
 213 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
 214                                        CodeGenOpt::Level OptLevel) {
 215   PM.add(createX86FloatingPointStackifierPass());
 216   return true;  // -print-machineinstr should print after this.
 217 }
 218
 219 bool X86TargetMachine::addPreEmitPass(PassManagerBase &PM,
 220                                       CodeGenOpt::Level OptLevel) {
 221   if (OptLevel != CodeGenOpt::None && Subtarget.hasSSE2()) {
 222     PM.add(createSSEDomainFixPass());
 223     return true;
 224   }
 225   return false;
 226 }
 227
 228 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 229                                       CodeGenOpt::Level OptLevel,
 230                                       JITCodeEmitter &JCE) {
 231   // FIXME: Move this to TargetJITInfo!
 232   // On Darwin, do not override 64-bit setting made in X86TargetMachine().
 233   if (DefRelocModel == Reloc::Default &&
 234       (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
 235     setRelocationModel(Reloc::Static);
 236     Subtarget.setPICStyle(PICStyles::None);
 237   }
 238
 239
 240   PM.add(createX86JITCodeEmitterPass(*this, JCE));
 241
 242   return false;
 243 }
 244
 245 void X86TargetMachine::setCodeModelForStatic() {
 246
 247     if (getCodeModel() != CodeModel::Default) return;
 248
 249     // For static codegen, if we're not already set, use Small codegen.
 250     setCodeModel(CodeModel::Small);
 251 }
 252
 253
 254 void X86TargetMachine::setCodeModelForJIT() {
 255
 256   if (getCodeModel() != CodeModel::Default) return;
 257
 258   // 64-bit JIT places everything in the same buffer except external functions.
 259   if (Subtarget.is64Bit())
 260     setCodeModel(CodeModel::Large);
 261   else
 262     setCodeModel(CodeModel::Small);
 263 }