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 "X86TargetAsmInfo.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 TargetAsmInfo *createTargetAsmInfo(const Target &T,
  26                                                 const StringRef &TT) {
  27   Triple TheTriple(TT);
  28   switch (TheTriple.getOS()) {
  29   case Triple::Darwin:
  30     return new X86DarwinTargetAsmInfo(TheTriple);
  31   case Triple::MinGW32:
  32   case Triple::MinGW64:
  33   case Triple::Cygwin:
  34     return new X86COFFTargetAsmInfo(TheTriple);
  35   case Triple::Win32:
  36     return new X86WinTargetAsmInfo(TheTriple);
  37   default:
  38     return new X86ELFTargetAsmInfo(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, createTargetAsmInfo);
  49   RegisterAsmInfoFn B(TheX86_64Target, createTargetAsmInfo);
  50 }
  51
  52
  53 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
  54                                          const std::string &FS)
  55   : X86TargetMachine(T, TT, FS, false) {
  56 }
  57
  58
  59 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
  60                                          const std::string &FS)
  61   : X86TargetMachine(T, TT, FS, true) {
  62 }
  63
  64 /// X86TargetMachine ctor - Create an X86 target.
  65 ///
  66 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
  67                                    const std::string &FS, bool is64Bit)
  68   : LLVMTargetMachine(T, TT),
  69     Subtarget(TT, FS, is64Bit),
  70     DataLayout(Subtarget.getDataLayout()),
  71     FrameInfo(TargetFrameInfo::StackGrowsDown,
  72               Subtarget.getStackAlignment(),
  73               (Subtarget.isTargetWin64() ? -40 :
  74                (Subtarget.is64Bit() ? -8 : -4))),
  75     InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
  76   DefRelocModel = getRelocationModel();
  77
  78   // If no relocation model was picked, default as appropriate for the target.
  79   if (getRelocationModel() == Reloc::Default) {
  80     if (!Subtarget.isTargetDarwin())
  81       setRelocationModel(Reloc::Static);
  82     else if (Subtarget.is64Bit())
  83       setRelocationModel(Reloc::PIC_);
  84     else
  85       setRelocationModel(Reloc::DynamicNoPIC);
  86   }
  87
  88   assert(getRelocationModel() != Reloc::Default &&
  89          "Relocation mode not picked");
  90
  91   // If no code model is picked, default to small.
  92   if (getCodeModel() == CodeModel::Default)
  93     setCodeModel(CodeModel::Small);
  94
  95   // ELF and X86-64 don't have a distinct DynamicNoPIC model.  DynamicNoPIC
  96   // is defined as a model for code which may be used in static or dynamic
  97   // executables but not necessarily a shared library. On X86-32 we just
  98   // compile in -static mode, in x86-64 we use PIC.
  99   if (getRelocationModel() == Reloc::DynamicNoPIC) {
 100     if (is64Bit)
 101       setRelocationModel(Reloc::PIC_);
 102     else if (!Subtarget.isTargetDarwin())
 103       setRelocationModel(Reloc::Static);
 104   }
 105
 106   // If we are on Darwin, disallow static relocation model in X86-64 mode, since
 107   // the Mach-O file format doesn't support it.
 108   if (getRelocationModel() == Reloc::Static &&
 109       Subtarget.isTargetDarwin() &&
 110       is64Bit)
 111     setRelocationModel(Reloc::PIC_);
 112
 113   // Determine the PICStyle based on the target selected.
 114   if (getRelocationModel() == Reloc::Static) {
 115     // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
 116     Subtarget.setPICStyle(PICStyles::None);
 117   } else if (Subtarget.isTargetCygMing()) {
 118     Subtarget.setPICStyle(PICStyles::None);
 119   } else if (Subtarget.isTargetDarwin()) {
 120     if (Subtarget.is64Bit())
 121       Subtarget.setPICStyle(PICStyles::RIPRel);
 122     else if (getRelocationModel() == Reloc::PIC_)
 123       Subtarget.setPICStyle(PICStyles::StubPIC);
 124     else {
 125       assert(getRelocationModel() == Reloc::DynamicNoPIC);
 126       Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
 127     }
 128   } else if (Subtarget.isTargetELF()) {
 129     if (Subtarget.is64Bit())
 130       Subtarget.setPICStyle(PICStyles::RIPRel);
 131     else
 132       Subtarget.setPICStyle(PICStyles::GOT);
 133   }
 134
 135   // Finally, if we have "none" as our PIC style, force to static mode.
 136   if (Subtarget.getPICStyle() == PICStyles::None)
 137     setRelocationModel(Reloc::Static);
 138 }
 139
 140 //===----------------------------------------------------------------------===//
 141 // Pass Pipeline Configuration
 142 //===----------------------------------------------------------------------===//
 143
 144 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
 145                                        CodeGenOpt::Level OptLevel) {
 146   // Install an instruction selector.
 147   PM.add(createX86ISelDag(*this, OptLevel));
 148
 149   // If we're using Fast-ISel, clean up the mess.
 150   if (EnableFastISel)
 151     PM.add(createDeadMachineInstructionElimPass());
 152
 153   // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
 154   PM.add(createX87FPRegKillInserterPass());
 155
 156   return false;
 157 }
 158
 159 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
 160                                       CodeGenOpt::Level OptLevel) {
 161   // Calculate and set max stack object alignment early, so we can decide
 162   // whether we will need stack realignment (and thus FP).
 163   PM.add(createX86MaxStackAlignmentCalculatorPass());
 164   return false;  // -print-machineinstr shouldn't print after this.
 165 }
 166
 167 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
 168                                        CodeGenOpt::Level OptLevel) {
 169   PM.add(createX86FloatingPointStackifierPass());
 170   return true;  // -print-machineinstr should print after this.
 171 }
 172
 173 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 174                                       CodeGenOpt::Level OptLevel,
 175                                       MachineCodeEmitter &MCE) {
 176   // FIXME: Move this to TargetJITInfo!
 177   // On Darwin, do not override 64-bit setting made in X86TargetMachine().
 178   if (DefRelocModel == Reloc::Default &&
 179       (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
 180     setRelocationModel(Reloc::Static);
 181     Subtarget.setPICStyle(PICStyles::None);
 182   }
 183
 184   // 64-bit JIT places everything in the same buffer except external functions.
 185   // On Darwin, use small code model but hack the call instruction for
 186   // externals.  Elsewhere, do not assume globals are in the lower 4G.
 187   if (Subtarget.is64Bit()) {
 188     if (Subtarget.isTargetDarwin())
 189       setCodeModel(CodeModel::Small);
 190     else
 191       setCodeModel(CodeModel::Large);
 192   }
 193
 194   PM.add(createX86CodeEmitterPass(*this, MCE));
 195
 196   return false;
 197 }
 198
 199 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 200                                       CodeGenOpt::Level OptLevel,
 201                                       JITCodeEmitter &JCE) {
 202   // FIXME: Move this to TargetJITInfo!
 203   // On Darwin, do not override 64-bit setting made in X86TargetMachine().
 204   if (DefRelocModel == Reloc::Default &&
 205       (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
 206     setRelocationModel(Reloc::Static);
 207     Subtarget.setPICStyle(PICStyles::None);
 208   }
 209
 210   // 64-bit JIT places everything in the same buffer except external functions.
 211   // On Darwin, use small code model but hack the call instruction for
 212   // externals.  Elsewhere, do not assume globals are in the lower 4G.
 213   if (Subtarget.is64Bit()) {
 214     if (Subtarget.isTargetDarwin())
 215       setCodeModel(CodeModel::Small);
 216     else
 217       setCodeModel(CodeModel::Large);
 218   }
 219
 220   PM.add(createX86JITCodeEmitterPass(*this, JCE));
 221
 222   return false;
 223 }
 224
 225 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
 226                                       CodeGenOpt::Level OptLevel,
 227                                       ObjectCodeEmitter &OCE) {
 228   PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
 229   return false;
 230 }
 231
 232 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 233                                             CodeGenOpt::Level OptLevel,
 234                                             MachineCodeEmitter &MCE) {
 235   PM.add(createX86CodeEmitterPass(*this, MCE));
 236   return false;
 237 }
 238
 239 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 240                                             CodeGenOpt::Level OptLevel,
 241                                             JITCodeEmitter &JCE) {
 242   PM.add(createX86JITCodeEmitterPass(*this, JCE));
 243   return false;
 244 }
 245
 246 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 247                                             CodeGenOpt::Level OptLevel,
 248                                             ObjectCodeEmitter &OCE) {
 249   PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
 250   return false;
 251 }