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//===-- PPCTargetMachine.cpp - Define TargetMachine for PowerPC -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Top-level implementation for the PowerPC target.
//
//===----------------------------------------------------------------------===//
#include "PPC.h"
#include "PPCTargetMachine.h"
#include "llvm/PassManager.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
// This is duplicated code. Refactor this.
static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
MCContext &Ctx, TargetAsmBackend &TAB,
raw_ostream &OS,
MCCodeEmitter *Emitter,
bool RelaxAll,
bool NoExecStack) {
if (Triple(TT).isOSDarwin())
return createMachOStreamer(Ctx, TAB, OS, Emitter, RelaxAll);
return NULL;
}
extern "C" void LLVMInitializePowerPCTarget() {
// Register the targets
RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
RegisterTargetMachine<PPC64TargetMachine> B(ThePPC64Target);
// Register the MC Code Emitter
TargetRegistry::RegisterCodeEmitter(ThePPC32Target, createPPCMCCodeEmitter);
TargetRegistry::RegisterCodeEmitter(ThePPC64Target, createPPCMCCodeEmitter);
// Register the asm backend.
TargetRegistry::RegisterAsmBackend(ThePPC32Target, createPPCAsmBackend);
TargetRegistry::RegisterAsmBackend(ThePPC64Target, createPPCAsmBackend);
// Register the object streamer.
TargetRegistry::RegisterObjectStreamer(ThePPC32Target, createMCStreamer);
TargetRegistry::RegisterObjectStreamer(ThePPC64Target, createMCStreamer);
}
PPCTargetMachine::PPCTargetMachine(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, is64Bit),
DataLayout(Subtarget.getTargetDataString()), InstrInfo(*this),
FrameLowering(Subtarget), JITInfo(*this, is64Bit),
TLInfo(*this), TSInfo(*this),
InstrItins(Subtarget.getInstrItineraryData()) {
if (getRelocationModel() == Reloc::Default) {
if (Subtarget.isDarwin())
setRelocationModel(Reloc::DynamicNoPIC);
else
setRelocationModel(Reloc::Static);
}
}
/// Override this for PowerPC. Tail merging happily breaks up instruction issue
/// groups, which typically degrades performance.
bool PPCTargetMachine::getEnableTailMergeDefault() const { return false; }
PPC32TargetMachine::PPC32TargetMachine(const Target &T, const std::string &TT,
const std::string &CPU,
const std::string &FS)
: PPCTargetMachine(T, TT, CPU, FS, false) {
}
PPC64TargetMachine::PPC64TargetMachine(const Target &T, const std::string &TT,
const std::string &CPU,
const std::string &FS)
: PPCTargetMachine(T, TT, CPU, FS, true) {
}
//===----------------------------------------------------------------------===//
// Pass Pipeline Configuration
//===----------------------------------------------------------------------===//
bool PPCTargetMachine::addInstSelector(PassManagerBase &PM,
CodeGenOpt::Level OptLevel) {
// Install an instruction selector.
PM.add(createPPCISelDag(*this));
return false;
}
bool PPCTargetMachine::addPreEmitPass(PassManagerBase &PM,
CodeGenOpt::Level OptLevel) {
// Must run branch selection immediately preceding the asm printer.
PM.add(createPPCBranchSelectionPass());
return false;
}
bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
CodeGenOpt::Level OptLevel,
JITCodeEmitter &JCE) {
// The JIT should use the static relocation model in ppc32 mode, PIC in ppc64.
// FIXME: This should be moved to TargetJITInfo!!
if (Subtarget.isPPC64()) {
// We use PIC codegen in ppc64 mode, because otherwise we'd have to use many
// instructions to materialize arbitrary global variable + function +
// constant pool addresses.
setRelocationModel(Reloc::PIC_);
// Temporary workaround for the inability of PPC64 JIT to handle jump
// tables.
DisableJumpTables = true;
} else {
setRelocationModel(Reloc::Static);
}
// Inform the subtarget that we are in JIT mode. FIXME: does this break macho
// writing?
Subtarget.SetJITMode();
// Machine code emitter pass for PowerPC.
PM.add(createPPCJITCodeEmitterPass(*this, JCE));
return false;
}
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