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//===------------------------- MemberPointer.cpp ----------------*- C++ -*-===//
//
// 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 "MemberPointer.h"
#include "Context.h"
#include "FunctionPointer.h"
#include "Program.h"
#include "Record.h"
namespace clang {
namespace interp {
std::optional<Pointer> MemberPointer::toPointer(const Context &Ctx) const {
if (!Dcl || isa<FunctionDecl>(Dcl))
return Base;
assert((isa<FieldDecl, IndirectFieldDecl>(Dcl)));
if (!Base.isBlockPointer())
return std::nullopt;
Pointer CastedBase =
(PtrOffset < 0 ? Base.atField(-PtrOffset) : Base.atFieldSub(PtrOffset));
const Record *BaseRecord = CastedBase.getRecord();
if (!BaseRecord)
return std::nullopt;
unsigned Offset = 0;
Offset += CastedBase.block()->getDescriptor()->getMetadataSize();
if (const auto *FD = dyn_cast<FieldDecl>(Dcl)) {
if (FD->getParent() == BaseRecord->getDecl())
return CastedBase.atField(BaseRecord->getField(FD)->Offset);
const RecordDecl *FieldParent = FD->getParent();
const Record *FieldRecord = Ctx.getRecord(FieldParent);
Offset += FieldRecord->getField(FD)->Offset;
if (Offset > CastedBase.block()->getSize())
return std::nullopt;
if (const RecordDecl *BaseDecl = Base.getDeclPtr().getRecord()->getDecl();
BaseDecl != FieldParent)
Offset += Ctx.collectBaseOffset(FieldParent, BaseDecl);
} else {
const auto *IFD = cast<IndirectFieldDecl>(Dcl);
for (const NamedDecl *ND : IFD->chain()) {
const FieldDecl *F = cast<FieldDecl>(ND);
const RecordDecl *FieldParent = F->getParent();
const Record *FieldRecord = Ctx.getRecord(FieldParent);
Offset += FieldRecord->getField(F)->Offset;
}
}
assert(BaseRecord);
if (Offset > CastedBase.block()->getSize())
return std::nullopt;
assert(Offset <= CastedBase.block()->getSize());
return Pointer(const_cast<Block *>(Base.block()), Offset, Offset);
}
FunctionPointer MemberPointer::toFunctionPointer(const Context &Ctx) const {
return FunctionPointer(Ctx.getProgram().getFunction(cast<FunctionDecl>(Dcl)));
}
APValue MemberPointer::toAPValue(const ASTContext &ASTCtx) const {
if (isZero())
return APValue(static_cast<ValueDecl *>(nullptr), /*IsDerivedMember=*/false,
/*Path=*/{});
if (hasBase())
return Base.toAPValue(ASTCtx);
return APValue(getDecl(), /*IsDerivedMember=*/false,
/*Path=*/{});
}
} // namespace interp
} // namespace clang
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