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                                       createX86MCCodeEmitter);
  72   TargetRegistry::RegisterCodeEmitter(TheX86_64Target,
  73                                       createX86MCCodeEmitter);
  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 &CPU,
  91                                          const std::string &FS)
  92   : X86TargetMachine(T, TT, CPU, FS, false),
  93     DataLayout(getSubtargetImpl()->isTargetDarwin() ?
  94                "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-f128:128:128-n8:16:32" :
  95                (getSubtargetImpl()->isTargetCygMing() ||
  96                 getSubtargetImpl()->isTargetWindows()) ?
  97                "e-p:32:32-f64:64:64-i64:64:64-f80:32:32-f128:128:128-n8:16:32" :
  98                "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-f128:128:128-n8:16:32"),
  99     InstrInfo(*this),
 100     TSInfo(*this),
 101     TLInfo(*this),
 102     JITInfo(*this) {
 103 }
 104
 105
 106 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
 107                                          const std::string &CPU,
 108                                          const std::string &FS)
 109   : X86TargetMachine(T, TT, CPU, FS, true),
 110     DataLayout("e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-f128:128:128-n8:16:32:64"),
 111     InstrInfo(*this),
 112     TSInfo(*this),
 113     TLInfo(*this),
 114     JITInfo(*this) {
 115 }
 116
 117 /// X86TargetMachine ctor - Create an X86 target.
 118 ///
 119 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
 120                                    const std::string &CPU,
 121                                    const std::string &FS, bool is64Bit)
 122   : LLVMTargetMachine(T, TT, CPU, FS),
 123     Subtarget(TT, CPU, FS, StackAlignmentOverride, is64Bit),
 124     FrameLowering(*this, Subtarget),
 125     ELFWriterInfo(is64Bit, true) {
 126   DefRelocModel = getRelocationModel();
 127
 128   // If no relocation model was picked, default as appropriate for the target.
 129   if (getRelocationModel() == Reloc::Default) {
 130     // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode.
 131     // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we
 132     // use static relocation model by default.
 133     if (Subtarget.isTargetDarwin()) {
 134       if (Subtarget.is64Bit())
 135         setRelocationModel(Reloc::PIC_);
 136       else
 137         setRelocationModel(Reloc::DynamicNoPIC);
 138     } else if (Subtarget.isTargetWin64())
 139       setRelocationModel(Reloc::PIC_);
 140     else
 141       setRelocationModel(Reloc::Static);
 142   }
 143
 144   assert(getRelocationModel() != Reloc::Default &&
 145          "Relocation mode not picked");
 146
 147   // ELF and X86-64 don't have a distinct DynamicNoPIC model.  DynamicNoPIC
 148   // is defined as a model for code which may be used in static or dynamic
 149   // executables but not necessarily a shared library. On X86-32 we just
 150   // compile in -static mode, in x86-64 we use PIC.
 151   if (getRelocationModel() == Reloc::DynamicNoPIC) {
 152     if (is64Bit)
 153       setRelocationModel(Reloc::PIC_);
 154     else if (!Subtarget.isTargetDarwin())
 155       setRelocationModel(Reloc::Static);
 156   }
 157
 158   // If we are on Darwin, disallow static relocation model in X86-64 mode, since
 159   // the Mach-O file format doesn't support it.
 160   if (getRelocationModel() == Reloc::Static &&
 161       Subtarget.isTargetDarwin() &&
 162       is64Bit)
 163     setRelocationModel(Reloc::PIC_);
 164
 165   // Determine the PICStyle based on the target selected.
 166   if (getRelocationModel() == Reloc::Static) {
 167     // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
 168     Subtarget.setPICStyle(PICStyles::None);
 169   } else if (Subtarget.is64Bit()) {
 170     // PIC in 64 bit mode is always rip-rel.
 171     Subtarget.setPICStyle(PICStyles::RIPRel);
 172   } else if (Subtarget.isTargetCygMing()) {
 173     Subtarget.setPICStyle(PICStyles::None);
 174   } else if (Subtarget.isTargetDarwin()) {
 175     if (getRelocationModel() == Reloc::PIC_)
 176       Subtarget.setPICStyle(PICStyles::StubPIC);
 177     else {
 178       assert(getRelocationModel() == Reloc::DynamicNoPIC);
 179       Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
 180     }
 181   } else if (Subtarget.isTargetELF()) {
 182     Subtarget.setPICStyle(PICStyles::GOT);
 183   }
 184
 185   // Finally, if we have "none" as our PIC style, force to static mode.
 186   if (Subtarget.getPICStyle() == PICStyles::None)
 187     setRelocationModel(Reloc::Static);
 188
 189   // default to hard float ABI
 190   if (FloatABIType == FloatABI::Default)
 191     FloatABIType = FloatABI::Hard;
 192 }
 193
 194 //===----------------------------------------------------------------------===//
 195 // Pass Pipeline Configuration
 196 //===----------------------------------------------------------------------===//
 197
 198 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
 199                                        CodeGenOpt::Level OptLevel) {
 200   // Install an instruction selector.
 201   PM.add(createX86ISelDag(*this, OptLevel));
 202
 203   // For 32-bit, prepend instructions to set the "global base reg" for PIC.
 204   if (!Subtarget.is64Bit())
 205     PM.add(createGlobalBaseRegPass());
 206
 207   return false;
 208 }
 209
 210 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
 211                                       CodeGenOpt::Level OptLevel) {
 212   PM.add(createX86MaxStackAlignmentHeuristicPass());
 213   return false;  // -print-machineinstr shouldn't print after this.
 214 }
 215
 216 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
 217                                        CodeGenOpt::Level OptLevel) {
 218   PM.add(createX86FloatingPointStackifierPass());
 219   return true;  // -print-machineinstr should print after this.
 220 }
 221
 222 bool X86TargetMachine::addPreEmitPass(PassManagerBase &PM,
 223                                       CodeGenOpt::Level OptLevel) {
 224   if (OptLevel != CodeGenOpt::None && Subtarget.hasSSE2()) {
 225     PM.add(createSSEDomainFixPass());
 226     return true;
 227   }
 228   return false;
 229 }
 230
 231 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 232                                       CodeGenOpt::Level OptLevel,
 233                                       JITCodeEmitter &JCE) {
 234   // FIXME: Move this to TargetJITInfo!
 235   // On Darwin, do not override 64-bit setting made in X86TargetMachine().
 236   if (DefRelocModel == Reloc::Default &&
 237       (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
 238     setRelocationModel(Reloc::Static);
 239     Subtarget.setPICStyle(PICStyles::None);
 240   }
 241
 242
 243   PM.add(createX86JITCodeEmitterPass(*this, JCE));
 244
 245   return false;
 246 }
 247
 248 void X86TargetMachine::setCodeModelForStatic() {
 249
 250     if (getCodeModel() != CodeModel::Default) return;
 251
 252     // For static codegen, if we're not already set, use Small codegen.
 253     setCodeModel(CodeModel::Small);
 254 }
 255
 256
 257 void X86TargetMachine::setCodeModelForJIT() {
 258
 259   if (getCodeModel() != CodeModel::Default) return;
 260
 261   // 64-bit JIT places everything in the same buffer except external functions.
 262   if (Subtarget.is64Bit())
 263     setCodeModel(CodeModel::Large);
 264   else
 265     setCodeModel(CodeModel::Small);
 266 }