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//===-- AVRTargetMachine.cpp - Define TargetMachine for AVR ---------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file defines the AVR specific subclass of TargetMachine.
//
//===----------------------------------------------------------------------===//
#include "AVRTargetMachine.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/TargetRegistry.h"
#include "AVR.h"
#include "AVRTargetObjectFile.h"
#include "MCTargetDesc/AVRMCTargetDesc.h"
#include "TargetInfo/AVRTargetInfo.h"
namespace llvm {
static const char *AVRDataLayout = "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8";
/// Processes a CPU name.
static StringRef getCPU(StringRef CPU) {
if (CPU.empty() || CPU == "generic") {
return "avr2";
}
return CPU;
}
static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
return RM.getValueOr(Reloc::Static);
}
AVRTargetMachine::AVRTargetMachine(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, AVRDataLayout, TT, getCPU(CPU), FS, Options,
getEffectiveRelocModel(RM),
getEffectiveCodeModel(CM, CodeModel::Small), OL),
SubTarget(TT, std::string(getCPU(CPU)), std::string(FS), *this) {
this->TLOF = std::make_unique<AVRTargetObjectFile>();
initAsmInfo();
}
namespace {
/// AVR Code Generator Pass Configuration Options.
class AVRPassConfig : public TargetPassConfig {
public:
AVRPassConfig(AVRTargetMachine &TM, PassManagerBase &PM)
: TargetPassConfig(TM, PM) {}
AVRTargetMachine &getAVRTargetMachine() const {
return getTM<AVRTargetMachine>();
}
void addIRPasses() override;
bool addInstSelector() override;
void addPreSched2() override;
void addPreEmitPass() override;
void addPreRegAlloc() override;
};
} // namespace
TargetPassConfig *AVRTargetMachine::createPassConfig(PassManagerBase &PM) {
return new AVRPassConfig(*this, PM);
}
void AVRPassConfig::addIRPasses() {
// Expand instructions like
// %result = shl i32 %n, %amount
// to a loop so that library calls are avoided.
addPass(createAVRShiftExpandPass());
TargetPassConfig::addIRPasses();
}
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRTarget() {
// Register the target.
RegisterTargetMachine<AVRTargetMachine> X(getTheAVRTarget());
auto &PR = *PassRegistry::getPassRegistry();
initializeAVRExpandPseudoPass(PR);
initializeAVRRelaxMemPass(PR);
initializeAVRShiftExpandPass(PR);
}
const AVRSubtarget *AVRTargetMachine::getSubtargetImpl() const {
return &SubTarget;
}
const AVRSubtarget *AVRTargetMachine::getSubtargetImpl(const Function &) const {
return &SubTarget;
}
//===----------------------------------------------------------------------===//
// Pass Pipeline Configuration
//===----------------------------------------------------------------------===//
bool AVRPassConfig::addInstSelector() {
// Install an instruction selector.
addPass(createAVRISelDag(getAVRTargetMachine(), getOptLevel()));
// Create the frame analyzer pass used by the PEI pass.
addPass(createAVRFrameAnalyzerPass());
return false;
}
void AVRPassConfig::addPreRegAlloc() {
// Create the dynalloc SP save/restore pass to handle variable sized allocas.
addPass(createAVRDynAllocaSRPass());
}
void AVRPassConfig::addPreSched2() {
addPass(createAVRRelaxMemPass());
addPass(createAVRExpandPseudoPass());
}
void AVRPassConfig::addPreEmitPass() {
// Must run branch selection immediately preceding the asm printer.
addPass(&BranchRelaxationPassID);
}
} // end of namespace llvm
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