| //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the X86 specific subclass of TargetMachine. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "X86MCAsmInfo.h" |
| #include "X86TargetMachine.h" |
| #include "X86.h" |
| #include "llvm/PassManager.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/Passes.h" |
| #include "llvm/MC/MCCodeEmitter.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/Support/FormattedStream.h" |
| #include "llvm/Target/TargetOptions.h" |
| #include "llvm/Target/TargetRegistry.h" |
| using namespace llvm; |
| |
| static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) { |
| Triple TheTriple(TT); |
| switch (TheTriple.getOS()) { |
| case Triple::Darwin: |
| return new X86MCAsmInfoDarwin(TheTriple); |
| case Triple::MinGW32: |
| case Triple::MinGW64: |
| case Triple::Cygwin: |
| case Triple::Win32: |
| return new X86MCAsmInfoCOFF(TheTriple); |
| default: |
| return new X86ELFMCAsmInfo(TheTriple); |
| } |
| } |
| |
| static MCStreamer *createMCStreamer(const Target &T, const std::string &TT, |
| MCContext &Ctx, TargetAsmBackend &TAB, |
| raw_ostream &_OS, |
| MCCodeEmitter *_Emitter, |
| bool RelaxAll) { |
| Triple TheTriple(TT); |
| switch (TheTriple.getOS()) { |
| case Triple::Darwin: |
| return createMachOStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll); |
| case Triple::MinGW32: |
| case Triple::MinGW64: |
| case Triple::Cygwin: |
| case Triple::Win32: |
| return createWinCOFFStreamer(Ctx, TAB, *_Emitter, _OS, RelaxAll); |
| default: |
| // FIXME: default to ELF. |
| report_fatal_error("object emission not implemented for this target."); |
| } |
| } |
| |
| extern "C" void LLVMInitializeX86Target() { |
| // Register the target. |
| RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target); |
| RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target); |
| |
| // Register the target asm info. |
| RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo); |
| RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo); |
| |
| // Register the code emitter. |
| TargetRegistry::RegisterCodeEmitter(TheX86_32Target, |
| createX86_32MCCodeEmitter); |
| TargetRegistry::RegisterCodeEmitter(TheX86_64Target, |
| createX86_64MCCodeEmitter); |
| |
| // Register the asm backend. |
| TargetRegistry::RegisterAsmBackend(TheX86_32Target, |
| createX86_32AsmBackend); |
| TargetRegistry::RegisterAsmBackend(TheX86_64Target, |
| createX86_64AsmBackend); |
| |
| // Register the object streamer. |
| TargetRegistry::RegisterObjectStreamer(TheX86_32Target, |
| createMCStreamer); |
| TargetRegistry::RegisterObjectStreamer(TheX86_64Target, |
| createMCStreamer); |
| } |
| |
| |
| X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT, |
| const std::string &FS) |
| : X86TargetMachine(T, TT, FS, false) { |
| } |
| |
| |
| X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT, |
| const std::string &FS) |
| : X86TargetMachine(T, TT, FS, true) { |
| } |
| |
| /// X86TargetMachine ctor - Create an X86 target. |
| /// |
| X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT, |
| const std::string &FS, bool is64Bit) |
| : LLVMTargetMachine(T, TT), |
| Subtarget(TT, FS, is64Bit), |
| DataLayout(Subtarget.getDataLayout()), |
| FrameInfo(TargetFrameInfo::StackGrowsDown, |
| Subtarget.getStackAlignment(), |
| (Subtarget.isTargetWin64() ? -40 : |
| (Subtarget.is64Bit() ? -8 : -4))), |
| InstrInfo(*this), JITInfo(*this), TLInfo(*this), TSInfo(*this) { |
| DefRelocModel = getRelocationModel(); |
| |
| // If no relocation model was picked, default as appropriate for the target. |
| if (getRelocationModel() == Reloc::Default) { |
| if (!Subtarget.isTargetDarwin()) |
| setRelocationModel(Reloc::Static); |
| else if (Subtarget.is64Bit()) |
| setRelocationModel(Reloc::PIC_); |
| else |
| setRelocationModel(Reloc::DynamicNoPIC); |
| } |
| |
| assert(getRelocationModel() != Reloc::Default && |
| "Relocation mode not picked"); |
| |
| // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC |
| // is defined as a model for code which may be used in static or dynamic |
| // executables but not necessarily a shared library. On X86-32 we just |
| // compile in -static mode, in x86-64 we use PIC. |
| if (getRelocationModel() == Reloc::DynamicNoPIC) { |
| if (is64Bit) |
| setRelocationModel(Reloc::PIC_); |
| else if (!Subtarget.isTargetDarwin()) |
| setRelocationModel(Reloc::Static); |
| } |
| |
| // If we are on Darwin, disallow static relocation model in X86-64 mode, since |
| // the Mach-O file format doesn't support it. |
| if (getRelocationModel() == Reloc::Static && |
| Subtarget.isTargetDarwin() && |
| is64Bit) |
| setRelocationModel(Reloc::PIC_); |
| |
| // Determine the PICStyle based on the target selected. |
| if (getRelocationModel() == Reloc::Static) { |
| // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None. |
| Subtarget.setPICStyle(PICStyles::None); |
| } else if (Subtarget.isTargetCygMing()) { |
| Subtarget.setPICStyle(PICStyles::None); |
| } else if (Subtarget.isTargetDarwin()) { |
| if (Subtarget.is64Bit()) |
| Subtarget.setPICStyle(PICStyles::RIPRel); |
| else if (getRelocationModel() == Reloc::PIC_) |
| Subtarget.setPICStyle(PICStyles::StubPIC); |
| else { |
| assert(getRelocationModel() == Reloc::DynamicNoPIC); |
| Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC); |
| } |
| } |
| |
| // Finally, if we have "none" as our PIC style, force to static mode. |
| if (Subtarget.getPICStyle() == PICStyles::None) |
| setRelocationModel(Reloc::Static); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Pass Pipeline Configuration |
| //===----------------------------------------------------------------------===// |
| |
| bool X86TargetMachine::addInstSelector(PassManagerBase &PM, |
| CodeGenOpt::Level OptLevel) { |
| // Install an instruction selector. |
| PM.add(createX86ISelDag(*this, OptLevel)); |
| |
| // For 32-bit, prepend instructions to set the "global base reg" for PIC. |
| if (!Subtarget.is64Bit()) |
| PM.add(createGlobalBaseRegPass()); |
| |
| return false; |
| } |
| |
| bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM, |
| CodeGenOpt::Level OptLevel) { |
| PM.add(createX86MaxStackAlignmentHeuristicPass()); |
| return false; // -print-machineinstr shouldn't print after this. |
| } |
| |
| bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM, |
| CodeGenOpt::Level OptLevel) { |
| PM.add(createX86FloatingPointStackifierPass()); |
| return true; // -print-machineinstr should print after this. |
| } |
| |
| bool X86TargetMachine::addPreEmitPass(PassManagerBase &PM, |
| CodeGenOpt::Level OptLevel) { |
| if (OptLevel != CodeGenOpt::None && Subtarget.hasSSE2()) { |
| PM.add(createSSEDomainFixPass()); |
| return true; |
| } |
| return false; |
| } |
| |
| bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM, |
| CodeGenOpt::Level OptLevel, |
| JITCodeEmitter &JCE) { |
| // FIXME: Move this to TargetJITInfo! |
| // On Darwin, do not override 64-bit setting made in X86TargetMachine(). |
| if (DefRelocModel == Reloc::Default && |
| (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) { |
| setRelocationModel(Reloc::Static); |
| Subtarget.setPICStyle(PICStyles::None); |
| } |
| |
| |
| PM.add(createX86JITCodeEmitterPass(*this, JCE)); |
| |
| return false; |
| } |
| |
| void X86TargetMachine::setCodeModelForStatic() { |
| |
| if (getCodeModel() != CodeModel::Default) return; |
| |
| // For static codegen, if we're not already set, use Small codegen. |
| setCodeModel(CodeModel::Small); |
| } |
| |
| |
| void X86TargetMachine::setCodeModelForJIT() { |
| |
| if (getCodeModel() != CodeModel::Default) return; |
| |
| // 64-bit JIT places everything in the same buffer except external functions. |
| if (Subtarget.is64Bit()) |
| setCodeModel(CodeModel::Large); |
| else |
| setCodeModel(CodeModel::Small); |
| } |
