//===-- 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 "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 MCStreamer *createMCStreamer(const Target &T, const std::string &TT, MCContext &Ctx, TargetAsmBackend &TAB, raw_ostream &_OS, MCCodeEmitter *_Emitter, bool RelaxAll, bool NoExecStack) { Triple TheTriple(TT); if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO) return createMachOStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll); if (TheTriple.isOSWindows()) return createWinCOFFStreamer(Ctx, TAB, *_Emitter, _OS, RelaxAll); return createELFStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll, NoExecStack); } extern "C" void LLVMInitializeX86Target() { // Register the target. RegisterTargetMachine X(TheX86_32Target); RegisterTargetMachine Y(TheX86_64Target); // Register the code emitter. TargetRegistry::RegisterCodeEmitter(TheX86_32Target, createX86MCCodeEmitter); TargetRegistry::RegisterCodeEmitter(TheX86_64Target, createX86MCCodeEmitter); // 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 &CPU, const std::string &FS) : X86TargetMachine(T, TT, CPU, FS, false), DataLayout(getSubtargetImpl()->isTargetDarwin() ? "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-f128:128:128-n8:16:32" : (getSubtargetImpl()->isTargetCygMing() || getSubtargetImpl()->isTargetWindows()) ? "e-p:32:32-f64:64:64-i64:64:64-f80:32:32-f128:128:128-n8:16:32" : "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-f128:128:128-n8:16:32"), InstrInfo(*this), TSInfo(*this), TLInfo(*this), JITInfo(*this) { } X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT, const std::string &CPU, const std::string &FS) : X86TargetMachine(T, TT, CPU, FS, true), DataLayout("e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-f128:128:128-n8:16:32:64"), InstrInfo(*this), TSInfo(*this), TLInfo(*this), JITInfo(*this) { } /// X86TargetMachine ctor - Create an X86 target. /// X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT, const std::string &CPU, const std::string &FS, bool is64Bit) : LLVMTargetMachine(T, TT, CPU, FS), Subtarget(TT, CPU, FS, StackAlignmentOverride, is64Bit), FrameLowering(*this, Subtarget), ELFWriterInfo(is64Bit, true) { DefRelocModel = getRelocationModel(); // If no relocation model was picked, default as appropriate for the target. if (getRelocationModel() == Reloc::Default) { // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode. // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we // use static relocation model by default. if (Subtarget.isTargetDarwin()) { if (Subtarget.is64Bit()) setRelocationModel(Reloc::PIC_); else setRelocationModel(Reloc::DynamicNoPIC); } else if (Subtarget.isTargetWin64()) setRelocationModel(Reloc::PIC_); else setRelocationModel(Reloc::Static); } 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.is64Bit()) { // PIC in 64 bit mode is always rip-rel. Subtarget.setPICStyle(PICStyles::RIPRel); } else if (Subtarget.isTargetCygMing()) { Subtarget.setPICStyle(PICStyles::None); } else if (Subtarget.isTargetDarwin()) { if (getRelocationModel() == Reloc::PIC_) Subtarget.setPICStyle(PICStyles::StubPIC); else { assert(getRelocationModel() == Reloc::DynamicNoPIC); Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC); } } else if (Subtarget.isTargetELF()) { Subtarget.setPICStyle(PICStyles::GOT); } // Finally, if we have "none" as our PIC style, force to static mode. if (Subtarget.getPICStyle() == PICStyles::None) setRelocationModel(Reloc::Static); // default to hard float ABI if (FloatABIType == FloatABI::Default) FloatABIType = FloatABI::Hard; } //===----------------------------------------------------------------------===// // 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); }