//===- M68k.cpp -----------------------------------------------------------===//

//

// 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

//

//===----------------------------------------------------------------------===//

#include "ABIInfoImpl.h"

#include "TargetInfo.h"

using namespace clang;

using namespace clang::CodeGen;

//===----------------------------------------------------------------------===//

// M68k ABI Implementation

//===----------------------------------------------------------------------===//

namespace {

class M68kTargetCodeGenInfo : public TargetCodeGenInfo {

public:

  M68kTargetCodeGenInfo(CodeGenTypes &CGT)

      : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}

  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,

                           CodeGen::CodeGenModule &M) const override;

};

} // namespace

void M68kTargetCodeGenInfo::setTargetAttributes(

    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {

  if (const auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {

    if (const auto *attr = FD->getAttr<M68kInterruptAttr>()) {

      // Handle 'interrupt' attribute:

      llvm::Function *F = cast<llvm::Function>(GV);

      // Step 1: Set ISR calling convention.

      F->setCallingConv(llvm::CallingConv::M68k_INTR);

      // Step 2: Add attributes goodness.

      F->addFnAttr(llvm::Attribute::NoInline);

      // Step 3: Emit ISR vector alias.

      unsigned Num = attr->getNumber() / 2;

      llvm::GlobalAlias::create(llvm::Function::ExternalLinkage,

                                "__isr_" + Twine(Num), F);

    }

  }

}

std::unique_ptr<TargetCodeGenInfo>

CodeGen::createM68kTargetCodeGenInfo(CodeGenModule &CGM) {

  return std::make_unique<M68kTargetCodeGenInfo>(CGM.getTypes());

}