lib/Target/X86/X86TargetMachine.cpp

   1 //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source 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/Module.h"
  18 #include "llvm/PassManager.h"
  19 #include "llvm/CodeGen/MachineFunction.h"
  20 #include "llvm/CodeGen/Passes.h"
  21 #include "llvm/Target/TargetOptions.h"
  22 #include "llvm/Target/TargetMachineRegistry.h"
  23 #include "llvm/Transforms/Scalar.h"
  24 using namespace llvm;
  25
  26 /// X86TargetMachineModule - Note that this is used on hosts that cannot link
  27 /// in a library unless there are references into the library.  In particular,
  28 /// it seems that it is not possible to get things to work on Win32 without
  29 /// this.  Though it is unused, do not remove it.
  30 extern "C" int X86TargetMachineModule;
  31 int X86TargetMachineModule = 0;
  32
  33 namespace {
  34   // Register the target.
  35   RegisterTarget<X86_32TargetMachine>
  36   X("x86",    "  32-bit X86: Pentium-Pro and above");
  37   RegisterTarget<X86_64TargetMachine>
  38   Y("x86-64", "  64-bit X86: EM64T and AMD64");
  39 }
  40
  41 const TargetAsmInfo *X86TargetMachine::createTargetAsmInfo() const {
  42   return new X86TargetAsmInfo(*this);
  43 }
  44
  45 unsigned X86_32TargetMachine::getJITMatchQuality() {
  46 #if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
  47   return 10;
  48 #endif
  49   return 0;
  50 }
  51
  52 unsigned X86_64TargetMachine::getJITMatchQuality() {
  53 #if defined(__x86_64__)
  54   return 10;
  55 #endif
  56   return 0;
  57 }
  58
  59 unsigned X86_32TargetMachine::getModuleMatchQuality(const Module &M) {
  60   // We strongly match "i[3-9]86-*".
  61   std::string TT = M.getTargetTriple();
  62   if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
  63       TT[4] == '-' && TT[1] - '3' < 6)
  64     return 20;
  65   // If the target triple is something non-X86, we don't match.
  66   if (!TT.empty()) return 0;
  67
  68   if (M.getEndianness()  == Module::LittleEndian &&
  69       M.getPointerSize() == Module::Pointer32)
  70     return 10;                                   // Weak match
  71   else if (M.getEndianness() != Module::AnyEndianness ||
  72            M.getPointerSize() != Module::AnyPointerSize)
  73     return 0;                                    // Match for some other target
  74
  75   return getJITMatchQuality()/2;
  76 }
  77
  78 unsigned X86_64TargetMachine::getModuleMatchQuality(const Module &M) {
  79   // We strongly match "x86_64-*".
  80   std::string TT = M.getTargetTriple();
  81   if (TT.size() >= 7 && TT[0] == 'x' && TT[1] == '8' && TT[2] == '6' &&
  82       TT[3] == '_' && TT[4] == '6' && TT[5] == '4' && TT[6] == '-')
  83     return 20;
  84
  85   // We strongly match "amd64-*".
  86   if (TT.size() >= 6 && TT[0] == 'a' && TT[1] == 'm' && TT[2] == 'd' &&
  87       TT[3] == '6' && TT[4] == '4' && TT[5] == '-')
  88     return 20;
  89
  90   // If the target triple is something non-X86-64, we don't match.
  91   if (!TT.empty()) return 0;
  92
  93   if (M.getEndianness()  == Module::LittleEndian &&
  94       M.getPointerSize() == Module::Pointer64)
  95     return 10;                                   // Weak match
  96   else if (M.getEndianness() != Module::AnyEndianness ||
  97            M.getPointerSize() != Module::AnyPointerSize)
  98     return 0;                                    // Match for some other target
  99
 100   return getJITMatchQuality()/2;
 101 }
 102
 103 X86_32TargetMachine::X86_32TargetMachine(const Module &M, const std::string &FS)
 104   : X86TargetMachine(M, FS, false) {
 105 }
 106
 107
 108 X86_64TargetMachine::X86_64TargetMachine(const Module &M, const std::string &FS)
 109   : X86TargetMachine(M, FS, true) {
 110 }
 111
 112 /// X86TargetMachine ctor - Create an ILP32 architecture model
 113 ///
 114 X86TargetMachine::X86TargetMachine(const Module &M, const std::string &FS,
 115                                    bool is64Bit)
 116   : Subtarget(M, FS, is64Bit),
 117     DataLayout(Subtarget.getDataLayout()),
 118     FrameInfo(TargetFrameInfo::StackGrowsDown,
 119               Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
 120     InstrInfo(*this), JITInfo(*this), TLInfo(*this) {
 121   if (getRelocationModel() == Reloc::Default)
 122     if (Subtarget.isTargetDarwin() || Subtarget.isTargetCygMing())
 123       setRelocationModel(Reloc::DynamicNoPIC);
 124     else
 125       setRelocationModel(Reloc::Static);
 126   if (Subtarget.is64Bit()) {
 127     // No DynamicNoPIC support under X86-64.
 128     if (getRelocationModel() == Reloc::DynamicNoPIC)
 129       setRelocationModel(Reloc::PIC_);
 130     // Default X86-64 code model is small.
 131     if (getCodeModel() == CodeModel::Default)
 132       setCodeModel(CodeModel::Small);
 133   }
 134
 135   if (Subtarget.isTargetCygMing())
 136     Subtarget.setPICStyle(PICStyle::WinPIC);
 137   else if (Subtarget.isTargetDarwin())
 138     if (Subtarget.is64Bit())
 139       Subtarget.setPICStyle(PICStyle::RIPRel);
 140     else
 141       Subtarget.setPICStyle(PICStyle::Stub);
 142   else if (Subtarget.isTargetELF())
 143     if (Subtarget.is64Bit())
 144       Subtarget.setPICStyle(PICStyle::RIPRel);
 145     else
 146       Subtarget.setPICStyle(PICStyle::GOT);
 147 }
 148
 149 //===----------------------------------------------------------------------===//
 150 // Pass Pipeline Configuration
 151 //===----------------------------------------------------------------------===//
 152
 153 bool X86TargetMachine::addInstSelector(FunctionPassManager &PM, bool Fast) {
 154   // Install an instruction selector.
 155   PM.add(createX86ISelDag(*this, Fast));
 156   return false;
 157 }
 158
 159 bool X86TargetMachine::addPostRegAlloc(FunctionPassManager &PM, bool Fast) {
 160   PM.add(createX86FloatingPointStackifierPass());
 161   return true;  // -print-machineinstr should print after this.
 162 }
 163
 164 bool X86TargetMachine::addAssemblyEmitter(FunctionPassManager &PM, bool Fast,
 165                                           std::ostream &Out) {
 166   PM.add(createX86CodePrinterPass(Out, *this));
 167   return false;
 168 }
 169
 170 bool X86TargetMachine::addCodeEmitter(FunctionPassManager &PM, bool Fast,
 171                                       bool DumpAsm, MachineCodeEmitter &MCE) {
 172   // FIXME: Move this to TargetJITInfo!
 173   setRelocationModel(Reloc::Static);
 174   Subtarget.setPICStyle(PICStyle::None);
 175
 176   // JIT cannot ensure globals are placed in the lower 4G of address.
 177   if (Subtarget.is64Bit())
 178     setCodeModel(CodeModel::Large);
 179
 180   PM.add(createX86CodeEmitterPass(*this, MCE));
 181   if (DumpAsm)
 182     PM.add(createX86CodePrinterPass(*cerr.stream(), *this));
 183
 184   return false;
 185 }
 186
 187 bool X86TargetMachine::addSimpleCodeEmitter(FunctionPassManager &PM, bool Fast,
 188                                         bool DumpAsm, MachineCodeEmitter &MCE) {
 189   PM.add(createX86CodeEmitterPass(*this, MCE));
 190   if (DumpAsm)
 191     PM.add(createX86CodePrinterPass(*cerr.stream(), *this));
 192   return false;
 193 }