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262 lines
9.2 KiB
C++
262 lines
9.2 KiB
C++
//===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the X86 specific subclass of TargetMachine.
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//
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//===----------------------------------------------------------------------===//
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#include "X86MCAsmInfo.h"
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#include "X86TargetMachine.h"
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#include "X86.h"
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#include "llvm/PassManager.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegistry.h"
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using namespace llvm;
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static const MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
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Triple TheTriple(TT);
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switch (TheTriple.getOS()) {
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case Triple::Darwin:
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return new X86MCAsmInfoDarwin(TheTriple);
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case Triple::MinGW32:
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case Triple::MinGW64:
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case Triple::Cygwin:
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return new X86MCAsmInfoCOFF(TheTriple);
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case Triple::Win32:
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return new X86WinMCAsmInfo(TheTriple);
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default:
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return new X86ELFMCAsmInfo(TheTriple);
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}
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}
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extern "C" void LLVMInitializeX86Target() {
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// Register the target.
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RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
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RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
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// Register the target asm info.
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RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo);
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RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo);
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// Register the code emitter.
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TargetRegistry::RegisterCodeEmitter(TheX86_32Target, createX86MCCodeEmitter);
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TargetRegistry::RegisterCodeEmitter(TheX86_64Target, createX86MCCodeEmitter);
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}
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X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
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const std::string &FS)
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: X86TargetMachine(T, TT, FS, false) {
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}
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X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
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const std::string &FS)
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: X86TargetMachine(T, TT, FS, true) {
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}
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/// X86TargetMachine ctor - Create an X86 target.
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///
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X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
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const std::string &FS, bool is64Bit)
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: LLVMTargetMachine(T, TT),
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Subtarget(TT, FS, is64Bit),
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DataLayout(Subtarget.getDataLayout()),
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FrameInfo(TargetFrameInfo::StackGrowsDown,
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Subtarget.getStackAlignment(),
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(Subtarget.isTargetWin64() ? -40 :
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(Subtarget.is64Bit() ? -8 : -4))),
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InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
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DefRelocModel = getRelocationModel();
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// If no relocation model was picked, default as appropriate for the target.
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if (getRelocationModel() == Reloc::Default) {
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if (!Subtarget.isTargetDarwin())
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setRelocationModel(Reloc::Static);
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else if (Subtarget.is64Bit())
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setRelocationModel(Reloc::PIC_);
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else
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setRelocationModel(Reloc::DynamicNoPIC);
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}
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assert(getRelocationModel() != Reloc::Default &&
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"Relocation mode not picked");
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// ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
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// is defined as a model for code which may be used in static or dynamic
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// executables but not necessarily a shared library. On X86-32 we just
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// compile in -static mode, in x86-64 we use PIC.
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if (getRelocationModel() == Reloc::DynamicNoPIC) {
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if (is64Bit)
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setRelocationModel(Reloc::PIC_);
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else if (!Subtarget.isTargetDarwin())
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setRelocationModel(Reloc::Static);
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}
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// If we are on Darwin, disallow static relocation model in X86-64 mode, since
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// the Mach-O file format doesn't support it.
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if (getRelocationModel() == Reloc::Static &&
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Subtarget.isTargetDarwin() &&
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is64Bit)
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setRelocationModel(Reloc::PIC_);
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// Determine the PICStyle based on the target selected.
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if (getRelocationModel() == Reloc::Static) {
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// Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
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Subtarget.setPICStyle(PICStyles::None);
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} else if (Subtarget.isTargetCygMing()) {
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Subtarget.setPICStyle(PICStyles::None);
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} else if (Subtarget.isTargetDarwin()) {
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if (Subtarget.is64Bit())
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Subtarget.setPICStyle(PICStyles::RIPRel);
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else if (getRelocationModel() == Reloc::PIC_)
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Subtarget.setPICStyle(PICStyles::StubPIC);
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else {
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assert(getRelocationModel() == Reloc::DynamicNoPIC);
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Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
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}
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} else if (Subtarget.isTargetELF()) {
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if (Subtarget.is64Bit())
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Subtarget.setPICStyle(PICStyles::RIPRel);
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else
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Subtarget.setPICStyle(PICStyles::GOT);
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}
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// Finally, if we have "none" as our PIC style, force to static mode.
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if (Subtarget.getPICStyle() == PICStyles::None)
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setRelocationModel(Reloc::Static);
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}
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//===----------------------------------------------------------------------===//
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// Pass Pipeline Configuration
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//===----------------------------------------------------------------------===//
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bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel) {
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// Install an instruction selector.
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PM.add(createX86ISelDag(*this, OptLevel));
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// If we're using Fast-ISel, clean up the mess.
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if (EnableFastISel)
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PM.add(createDeadMachineInstructionElimPass());
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// Install a pass to insert x87 FP_REG_KILL instructions, as needed.
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PM.add(createX87FPRegKillInserterPass());
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return false;
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}
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bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel) {
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// Calculate and set max stack object alignment early, so we can decide
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// whether we will need stack realignment (and thus FP).
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PM.add(createMaxStackAlignmentCalculatorPass());
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return false; // -print-machineinstr shouldn't print after this.
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}
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bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel) {
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PM.add(createX86FloatingPointStackifierPass());
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return true; // -print-machineinstr should print after this.
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}
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bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel,
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MachineCodeEmitter &MCE) {
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// FIXME: Move this to TargetJITInfo!
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// On Darwin, do not override 64-bit setting made in X86TargetMachine().
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if (DefRelocModel == Reloc::Default &&
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(!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
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setRelocationModel(Reloc::Static);
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Subtarget.setPICStyle(PICStyles::None);
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}
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PM.add(createX86CodeEmitterPass(*this, MCE));
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return false;
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}
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bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel,
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JITCodeEmitter &JCE) {
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// FIXME: Move this to TargetJITInfo!
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// On Darwin, do not override 64-bit setting made in X86TargetMachine().
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if (DefRelocModel == Reloc::Default &&
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(!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
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setRelocationModel(Reloc::Static);
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Subtarget.setPICStyle(PICStyles::None);
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}
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PM.add(createX86JITCodeEmitterPass(*this, JCE));
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return false;
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}
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bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel,
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ObjectCodeEmitter &OCE) {
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PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
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return false;
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}
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bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel,
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MachineCodeEmitter &MCE) {
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PM.add(createX86CodeEmitterPass(*this, MCE));
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return false;
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}
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bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel,
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JITCodeEmitter &JCE) {
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PM.add(createX86JITCodeEmitterPass(*this, JCE));
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return false;
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}
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bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
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CodeGenOpt::Level OptLevel,
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ObjectCodeEmitter &OCE) {
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PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
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return false;
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}
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void X86TargetMachine::setCodeModelForStatic() {
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if (getCodeModel() != CodeModel::Default) return;
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// For static codegen, if we're not already set, use Small codegen.
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setCodeModel(CodeModel::Small);
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}
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void X86TargetMachine::setCodeModelForJIT() {
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if (getCodeModel() != CodeModel::Default) return;
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// 64-bit JIT places everything in the same buffer except external functions.
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if (Subtarget.is64Bit())
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setCodeModel(CodeModel::Large);
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else
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setCodeModel(CodeModel::Small);
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}
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/// FIXME: This call-back isn't good! We should be using the correct encoding
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/// regardless of the system. However, there are some systems which have bugs
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/// that prevent this from occuring.
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DwarfLSDAEncoding::Encoding X86TargetMachine::getLSDAEncoding() const {
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if (Subtarget.isTargetDarwin() && Subtarget.getDarwinVers() != 10)
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return DwarfLSDAEncoding::FourByte;
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return DwarfLSDAEncoding::EightByte;
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}
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