clang/lib/CIR/CodeGen/CIRGenCXXABI.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
//
//===----------------------------------------------------------------------===//
//
// This provides an abstract class for C++ code generation. Concrete subclasses
// of this implement code generation for specific C++ ABIs.
//
//===----------------------------------------------------------------------===//

#include "CIRGenCXXABI.h"
#include "CIRGenFunction.h"

#include "clang/AST/Decl.h"
#include "clang/AST/GlobalDecl.h"

using namespace clang;
using namespace clang::CIRGen;

CIRGenCXXABI::~CIRGenCXXABI() {}

void CIRGenCXXABI::buildThisParam(CIRGenFunction &cgf,
                                  FunctionArgList &params) {
  const auto *md = cast<CXXMethodDecl>(cgf.curGD.getDecl());

  // FIXME: I'm not entirely sure I like using a fake decl just for code
  // generation. Maybe we can come up with a better way?
  auto *thisDecl =
      ImplicitParamDecl::Create(cgm.getASTContext(), nullptr, md->getLocation(),
                                &cgm.getASTContext().Idents.get("this"),
                                md->getThisType(), ImplicitParamKind::CXXThis);
  params.push_back(thisDecl);

  // Classic codegen save thisDecl in CodeGenFunction::CXXABIThisDecl, but it
  // doesn't seem to be needed in CIRGen.
  assert(!cir::MissingFeatures::cxxabiThisDecl());

  // Classic codegen computes the alignment of thisDecl and saves it in
  // CodeGenFunction::CXXABIThisAlignment, but it doesn't seem to be needed in
  // CIRGen.
  assert(!cir::MissingFeatures::cxxabiThisAlignment());
}