MSP430TargetMachine.cpp

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//===-- MSP430TargetMachine.cpp - Define TargetMachine for MSP430 ---------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Top-level implementation for the MSP430 target.
//
//===----------------------------------------------------------------------===//
 
#include "MSP430TargetMachine.h"
#include "MSP430.h"
#include "MSP430MachineFunctionInfo.h"
#include "TargetInfo/MSP430TargetInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Option/LibraryOptions.h"
#include "llvm/Support/Compiler.h"
#include <optional>
using namespace llvm;
 
extern "C" LLVM_ABI LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430Target() {
  // Register the target.
  RegisterTargetMachine<MSP430TargetMachine> X(getTheMSP430Target());
  static opt::RegisterLibraryOptions<MSP430Options> O;
  PassRegistry &PR = *PassRegistry::getPassRegistry();
  initializeMSP430AsmPrinterPass(PR);
  initializeMSP430DAGToDAGISelLegacyPass(PR);
}
 
static Reloc::Model getEffectiveRelocModel(std::optional<Reloc::Model> RM) {
  return RM.value_or(Reloc::Static);
}
 
MSP430TargetMachine::MSP430TargetMachine(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, TT, CPU, FS, Options,
                               getEffectiveRelocModel(RM),
                               getEffectiveCodeModel(CM, CodeModel::Small), OL),
      CLOpts(cl::LibraryOptionsContext::get<MSP430Options>(
          Options.MCOptions.LibraryOptions)),
      TLOF(std::make_unique<TargetLoweringObjectFileELF>()),
      Subtarget(TT, std::string(CPU), std::string(FS), *this) {
  initAsmInfo();
}
 
MSP430TargetMachine::~MSP430TargetMachine() = default;
 
namespace {
/// MSP430 Code Generator Pass Configuration Options.
class MSP430PassConfig : public TargetPassConfig {
public:
  MSP430PassConfig(MSP430TargetMachine &TM, PassManagerBase &PM)
    : TargetPassConfig(TM, PM) {}
 
  MSP430TargetMachine &getMSP430TargetMachine() const {
    return getTM<MSP430TargetMachine>();
  }
 
  void addIRPasses() override;
  bool addInstSelector() override;
  void addPreEmitPass() override;
};
} // namespace
 
TargetPassConfig *MSP430TargetMachine::createPassConfig(PassManagerBase &PM) {
  return new MSP430PassConfig(*this, PM);
}
 
MachineFunctionInfo *MSP430TargetMachine::createMachineFunctionInfo(
    BumpPtrAllocator &Allocator, const Function &F,
    const TargetSubtargetInfo *STI) const {
  return MSP430MachineFunctionInfo::create<MSP430MachineFunctionInfo>(Allocator,
                                                                      F, STI);
}
 
void MSP430PassConfig::addIRPasses() {
  addPass(createAtomicExpandLegacyPass());
 
  TargetPassConfig::addIRPasses();
}
 
bool MSP430PassConfig::addInstSelector() {
  // Install an instruction selector.
  addPass(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
  return false;
}
 
void MSP430PassConfig::addPreEmitPass() {
  // Must run branch selection immediately preceding the asm printer.
  addPass(createMSP430BranchSelectLegacyPass());
}