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//===----------------------------------------------------------------------===//
//
// 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 ¶ms) {
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);
cgf.cxxabiThisDecl = thisDecl;
// Classic codegen computes the alignment of thisDecl and saves it in
// CodeGenFunction::CXXABIThisAlignment, but it is only used in emitTypeCheck
// in CodeGenFunction::StartFunction().
assert(!cir::MissingFeatures::cxxabiThisAlignment());
}
cir::GlobalLinkageKind CIRGenCXXABI::getCXXDestructorLinkage(
GVALinkage linkage, const CXXDestructorDecl *dtor, CXXDtorType dt) const {
// Delegate back to cgm by default.
return cgm.getCIRLinkageForDeclarator(dtor, linkage,
/*isConstantVariable=*/false);
}
mlir::Value CIRGenCXXABI::loadIncomingCXXThis(CIRGenFunction &cgf) {
ImplicitParamDecl *vd = getThisDecl(cgf);
Address addr = cgf.getAddrOfLocalVar(vd);
return cgf.getBuilder().create<cir::LoadOp>(
cgf.getLoc(vd->getLocation()), addr.getElementType(), addr.getPointer());
}
void CIRGenCXXABI::setCXXABIThisValue(CIRGenFunction &cgf,
mlir::Value thisPtr) {
/// Initialize the 'this' slot.
assert(getThisDecl(cgf) && "no 'this' variable for function");
cgf.cxxabiThisValue = thisPtr;
}
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