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/Support/FormattedStream.h"
  21 #include "llvm/Target/TargetOptions.h"
  22 #include "llvm/Target/TargetRegistry.h"
  23 using namespace llvm;
  24
  25 static const MCAsmInfo *createMCAsmInfo(const Target &T,
  26                                                 const StringRef &TT) {
  27   Triple TheTriple(TT);
  28   switch (TheTriple.getOS()) {
  29   case Triple::Darwin:
  30     return new X86MCAsmInfoDarwin(TheTriple);
  31   case Triple::MinGW32:
  32   case Triple::MinGW64:
  33   case Triple::Cygwin:
  34     return new X86MCAsmInfoCOFF(TheTriple);
  35   case Triple::Win32:
  36     return new X86WinMCAsmInfo(TheTriple);
  37   default:
  38     return new X86ELFMCAsmInfo(TheTriple);
  39   }
  40 }
  41
  42 extern "C" void LLVMInitializeX86Target() {
  43   // Register the target.
  44   RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
  45   RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
  46
  47   // Register the target asm info.
  48   RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo);
  49   RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo);
  50
  51   // Register the code emitter.
  52   TargetRegistry::RegisterCodeEmitter(TheX86_32Target, createX86MCCodeEmitter);
  53   TargetRegistry::RegisterCodeEmitter(TheX86_64Target, createX86MCCodeEmitter);
  54 }
  55
  56
  57 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
  58                                          const std::string &FS)
  59   : X86TargetMachine(T, TT, FS, false) {
  60 }
  61
  62
  63 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
  64                                          const std::string &FS)
  65   : X86TargetMachine(T, TT, FS, true) {
  66 }
  67
  68 /// X86TargetMachine ctor - Create an X86 target.
  69 ///
  70 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
  71                                    const std::string &FS, bool is64Bit)
  72   : LLVMTargetMachine(T, TT),
  73     Subtarget(TT, FS, is64Bit),
  74     DataLayout(Subtarget.getDataLayout()),
  75     FrameInfo(TargetFrameInfo::StackGrowsDown,
  76               Subtarget.getStackAlignment(),
  77               (Subtarget.isTargetWin64() ? -40 :
  78                (Subtarget.is64Bit() ? -8 : -4))),
  79     InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
  80   DefRelocModel = getRelocationModel();
  81
  82   // If no relocation model was picked, default as appropriate for the target.
  83   if (getRelocationModel() == Reloc::Default) {
  84     if (!Subtarget.isTargetDarwin())
  85       setRelocationModel(Reloc::Static);
  86     else if (Subtarget.is64Bit())
  87       setRelocationModel(Reloc::PIC_);
  88     else
  89       setRelocationModel(Reloc::DynamicNoPIC);
  90   }
  91
  92   assert(getRelocationModel() != Reloc::Default &&
  93          "Relocation mode not picked");
  94
  95   // If no code model is picked, default to small.
  96   if (getCodeModel() == CodeModel::Default)
  97     setCodeModel(CodeModel::Small);
  98
  99   // ELF and X86-64 don't have a distinct DynamicNoPIC model.  DynamicNoPIC
 100   // is defined as a model for code which may be used in static or dynamic
 101   // executables but not necessarily a shared library. On X86-32 we just
 102   // compile in -static mode, in x86-64 we use PIC.
 103   if (getRelocationModel() == Reloc::DynamicNoPIC) {
 104     if (is64Bit)
 105       setRelocationModel(Reloc::PIC_);
 106     else if (!Subtarget.isTargetDarwin())
 107       setRelocationModel(Reloc::Static);
 108   }
 109
 110   // If we are on Darwin, disallow static relocation model in X86-64 mode, since
 111   // the Mach-O file format doesn't support it.
 112   if (getRelocationModel() == Reloc::Static &&
 113       Subtarget.isTargetDarwin() &&
 114       is64Bit)
 115     setRelocationModel(Reloc::PIC_);
 116
 117   // Determine the PICStyle based on the target selected.
 118   if (getRelocationModel() == Reloc::Static) {
 119     // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
 120     Subtarget.setPICStyle(PICStyles::None);
 121   } else if (Subtarget.isTargetCygMing()) {
 122     Subtarget.setPICStyle(PICStyles::None);
 123   } else if (Subtarget.isTargetDarwin()) {
 124     if (Subtarget.is64Bit())
 125       Subtarget.setPICStyle(PICStyles::RIPRel);
 126     else if (getRelocationModel() == Reloc::PIC_)
 127       Subtarget.setPICStyle(PICStyles::StubPIC);
 128     else {
 129       assert(getRelocationModel() == Reloc::DynamicNoPIC);
 130       Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
 131     }
 132   } else if (Subtarget.isTargetELF()) {
 133     if (Subtarget.is64Bit())
 134       Subtarget.setPICStyle(PICStyles::RIPRel);
 135     else
 136       Subtarget.setPICStyle(PICStyles::GOT);
 137   }
 138
 139   // Finally, if we have "none" as our PIC style, force to static mode.
 140   if (Subtarget.getPICStyle() == PICStyles::None)
 141     setRelocationModel(Reloc::Static);
 142 }
 143
 144 //===----------------------------------------------------------------------===//
 145 // Pass Pipeline Configuration
 146 //===----------------------------------------------------------------------===//
 147
 148 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
 149                                        CodeGenOpt::Level OptLevel) {
 150   // Install an instruction selector.
 151   PM.add(createX86ISelDag(*this, OptLevel));
 152
 153   // If we're using Fast-ISel, clean up the mess.
 154   if (EnableFastISel)
 155     PM.add(createDeadMachineInstructionElimPass());
 156
 157   // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
 158   PM.add(createX87FPRegKillInserterPass());
 159
 160   return false;
 161 }
 162
 163 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
 164                                       CodeGenOpt::Level OptLevel) {
 165   // Calculate and set max stack object alignment early, so we can decide
 166   // whether we will need stack realignment (and thus FP).
 167   PM.add(createX86MaxStackAlignmentCalculatorPass());
 168   return false;  // -print-machineinstr shouldn't print after this.
 169 }
 170
 171 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
 172                                        CodeGenOpt::Level OptLevel) {
 173   PM.add(createX86FloatingPointStackifierPass());
 174   return true;  // -print-machineinstr should print after this.
 175 }
 176
 177 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 178                                       CodeGenOpt::Level OptLevel,
 179                                       MachineCodeEmitter &MCE) {
 180   // FIXME: Move this to TargetJITInfo!
 181   // On Darwin, do not override 64-bit setting made in X86TargetMachine().
 182   if (DefRelocModel == Reloc::Default &&
 183       (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
 184     setRelocationModel(Reloc::Static);
 185     Subtarget.setPICStyle(PICStyles::None);
 186   }
 187
 188   // 64-bit JIT places everything in the same buffer except external functions.
 189   // On Darwin, use small code model but hack the call instruction for
 190   // externals.  Elsewhere, do not assume globals are in the lower 4G.
 191   if (Subtarget.is64Bit()) {
 192     if (Subtarget.isTargetDarwin())
 193       setCodeModel(CodeModel::Small);
 194     else
 195       setCodeModel(CodeModel::Large);
 196   }
 197
 198   PM.add(createX86CodeEmitterPass(*this, MCE));
 199
 200   return false;
 201 }
 202
 203 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 204                                       CodeGenOpt::Level OptLevel,
 205                                       JITCodeEmitter &JCE) {
 206   // FIXME: Move this to TargetJITInfo!
 207   // On Darwin, do not override 64-bit setting made in X86TargetMachine().
 208   if (DefRelocModel == Reloc::Default &&
 209       (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
 210     setRelocationModel(Reloc::Static);
 211     Subtarget.setPICStyle(PICStyles::None);
 212   }
 213
 214   // 64-bit JIT places everything in the same buffer except external functions.
 215   // On Darwin, use small code model but hack the call instruction for
 216   // externals.  Elsewhere, do not assume globals are in the lower 4G.
 217   if (Subtarget.is64Bit()) {
 218     if (Subtarget.isTargetDarwin())
 219       setCodeModel(CodeModel::Small);
 220     else
 221       setCodeModel(CodeModel::Large);
 222   }
 223
 224   PM.add(createX86JITCodeEmitterPass(*this, JCE));
 225
 226   return false;
 227 }
 228
 229 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 230                                       CodeGenOpt::Level OptLevel,
 231                                       ObjectCodeEmitter &OCE) {
 232   PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
 233   return false;
 234 }
 235
 236 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 237                                             CodeGenOpt::Level OptLevel,
 238                                             MachineCodeEmitter &MCE) {
 239   PM.add(createX86CodeEmitterPass(*this, MCE));
 240   return false;
 241 }
 242
 243 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 244                                             CodeGenOpt::Level OptLevel,
 245                                             JITCodeEmitter &JCE) {
 246   PM.add(createX86JITCodeEmitterPass(*this, JCE));
 247   return false;
 248 }
 249
 250 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 251                                             CodeGenOpt::Level OptLevel,
 252                                             ObjectCodeEmitter &OCE) {
 253   PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
 254   return false;
 255 }