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//===-- Nios2TargetMachine.cpp - Define TargetMachine for Nios2 -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implements the info about Nios2 target spec.
//
//===----------------------------------------------------------------------===//
#include "Nios2TargetMachine.h"
#include "Nios2.h"
#include "Nios2TargetObjectFile.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
#define DEBUG_TYPE "nios2"
extern "C" void LLVMInitializeNios2Target() {
// Register the target.
RegisterTargetMachine<Nios2TargetMachine> X(getTheNios2Target());
}
static std::string computeDataLayout() {
return "e-p:32:32:32-i8:8:32-i16:16:32-n32";
}
static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
if (!RM.hasValue())
return Reloc::Static;
return *RM;
}
static CodeModel::Model getEffectiveCodeModel(Optional<CodeModel::Model> CM,
Reloc::Model RM, bool JIT) {
if (CM)
return *CM;
return CodeModel::Small;
}
Nios2TargetMachine::Nios2TargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Optional<Reloc::Model> RM,
Optional<CodeModel::Model> CM,
CodeGenOpt::Level OL, bool JIT)
: LLVMTargetMachine(
T, computeDataLayout(), TT, CPU, FS, Options,
getEffectiveRelocModel(RM),
getEffectiveCodeModel(CM, getEffectiveRelocModel(RM), JIT), OL),
TLOF(make_unique<Nios2TargetObjectFile>()),
Subtarget(TT, CPU, FS, *this) {
initAsmInfo();
}
Nios2TargetMachine::~Nios2TargetMachine() {}
const Nios2Subtarget *
Nios2TargetMachine::getSubtargetImpl(const Function &F) const {
Attribute CPUAttr = F.getFnAttribute("target-cpu");
Attribute FSAttr = F.getFnAttribute("target-features");
std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
? CPUAttr.getValueAsString().str()
: TargetCPU;
std::string FS = !FSAttr.hasAttribute(Attribute::None)
? FSAttr.getValueAsString().str()
: TargetFS;
auto &I = SubtargetMap[CPU + FS];
if (!I) {
// This needs to be done before we create a new subtarget since any
// creation will depend on the TM and the code generation flags on the
// function that reside in TargetOptions.
resetTargetOptions(F);
I = llvm::make_unique<Nios2Subtarget>(TargetTriple, CPU, FS, *this);
}
return I.get();
}
namespace {
/// Nios2 Code Generator Pass Configuration Options.
class Nios2PassConfig : public TargetPassConfig {
public:
Nios2PassConfig(Nios2TargetMachine &TM, PassManagerBase *PM)
: TargetPassConfig(TM, *PM) {}
Nios2TargetMachine &getNios2TargetMachine() const {
return getTM<Nios2TargetMachine>();
}
void addCodeGenPrepare() override;
bool addInstSelector() override;
void addIRPasses() override;
};
} // namespace
TargetPassConfig *Nios2TargetMachine::createPassConfig(PassManagerBase &PM) {
return new Nios2PassConfig(*this, &PM);
}
void Nios2PassConfig::addCodeGenPrepare() {
TargetPassConfig::addCodeGenPrepare();
}
void Nios2PassConfig::addIRPasses() { TargetPassConfig::addIRPasses(); }
// Install an instruction selector pass using
// the ISelDag to gen Nios2 code.
bool Nios2PassConfig::addInstSelector() {
addPass(createNios2ISelDag(getNios2TargetMachine(), getOptLevel()));
return false;
}