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//===--- CSKYTargetMachine.cpp - Define TargetMachine for CSKY ------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Implements the info about CSKY target spec.
//
//===----------------------------------------------------------------------===//
#include "CSKYTargetMachine.h"
#include "CSKY.h"
#include "CSKYMachineFunctionInfo.h"
#include "CSKYSubtarget.h"
#include "CSKYTargetObjectFile.h"
#include "TargetInfo/CSKYTargetInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/MC/TargetRegistry.h"
#include <optional>
using namespace llvm;
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeCSKYTarget() {
RegisterTargetMachine<CSKYTargetMachine> X(getTheCSKYTarget());
PassRegistry *Registry = PassRegistry::getPassRegistry();
initializeCSKYConstantIslandsPass(*Registry);
initializeCSKYDAGToDAGISelLegacyPass(*Registry);
}
static std::string computeDataLayout(const Triple &TT) {
std::string Ret;
// Only support little endian for now.
// TODO: Add support for big endian.
Ret += "e";
// CSKY is always 32-bit target with the CSKYv2 ABI as prefer now.
// It's a 4-byte aligned stack with ELF mangling only.
Ret += "-m:e-S32-p:32:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:32"
"-v128:32:32-a:0:32-Fi32-n32";
return Ret;
}
CSKYTargetMachine::CSKYTargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
std::optional<Reloc::Model> RM,
std::optional<CodeModel::Model> CM,
CodeGenOptLevel OL, bool JIT)
: CodeGenTargetMachineImpl(T, computeDataLayout(TT), TT, CPU, FS, Options,
RM.value_or(Reloc::Static),
getEffectiveCodeModel(CM, CodeModel::Small), OL),
TLOF(std::make_unique<CSKYELFTargetObjectFile>()) {
initAsmInfo();
}
const CSKYSubtarget *
CSKYTargetMachine::getSubtargetImpl(const Function &F) const {
Attribute CPUAttr = F.getFnAttribute("target-cpu");
Attribute TuneAttr = F.getFnAttribute("tune-cpu");
Attribute FSAttr = F.getFnAttribute("target-features");
std::string CPU =
CPUAttr.isValid() ? CPUAttr.getValueAsString().str() : TargetCPU;
std::string TuneCPU =
TuneAttr.isValid() ? TuneAttr.getValueAsString().str() : CPU;
std::string FS =
FSAttr.isValid() ? FSAttr.getValueAsString().str() : TargetFS;
std::string Key = CPU + TuneCPU + FS;
auto &I = SubtargetMap[Key];
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 = std::make_unique<CSKYSubtarget>(TargetTriple, CPU, TuneCPU, FS, *this);
if (I->useHardFloat() && !I->hasAnyFloatExt())
errs() << "Hard-float can't be used with current CPU,"
" set to Soft-float\n";
}
return I.get();
}
MachineFunctionInfo *CSKYTargetMachine::createMachineFunctionInfo(
BumpPtrAllocator &Allocator, const Function &F,
const TargetSubtargetInfo *STI) const {
return CSKYMachineFunctionInfo::create<CSKYMachineFunctionInfo>(Allocator, F,
STI);
}
namespace {
class CSKYPassConfig : public TargetPassConfig {
public:
CSKYPassConfig(CSKYTargetMachine &TM, PassManagerBase &PM)
: TargetPassConfig(TM, PM) {}
CSKYTargetMachine &getCSKYTargetMachine() const {
return getTM<CSKYTargetMachine>();
}
void addIRPasses() override;
bool addInstSelector() override;
void addPreEmitPass() override;
};
} // namespace
TargetPassConfig *CSKYTargetMachine::createPassConfig(PassManagerBase &PM) {
return new CSKYPassConfig(*this, PM);
}
void CSKYPassConfig::addIRPasses() {
addPass(createAtomicExpandLegacyPass());
TargetPassConfig::addIRPasses();
}
bool CSKYPassConfig::addInstSelector() {
addPass(createCSKYISelDag(getCSKYTargetMachine(), getOptLevel()));
return false;
}
void CSKYPassConfig::addPreEmitPass() {
addPass(createCSKYConstantIslandPass());
}
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