77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
//===------------------------- MemberPointer.cpp ----------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "MemberPointer.h"
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#include "Context.h"
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#include "FunctionPointer.h"
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#include "Program.h"
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#include "Record.h"
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namespace clang {
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namespace interp {
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std::optional<Pointer> MemberPointer::toPointer(const Context &Ctx) const {
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if (!Dcl || isa<FunctionDecl>(Dcl))
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return Base;
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const FieldDecl *FD = cast<FieldDecl>(Dcl);
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assert(FD);
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if (!Base.isBlockPointer())
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return std::nullopt;
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Pointer CastedBase =
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(PtrOffset < 0 ? Base.atField(-PtrOffset) : Base.atFieldSub(PtrOffset));
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const Record *BaseRecord = CastedBase.getRecord();
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if (!BaseRecord)
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return std::nullopt;
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assert(BaseRecord);
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if (FD->getParent() == BaseRecord->getDecl())
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return CastedBase.atField(BaseRecord->getField(FD)->Offset);
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const RecordDecl *FieldParent = FD->getParent();
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const Record *FieldRecord = Ctx.getRecord(FieldParent);
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unsigned Offset = 0;
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Offset += FieldRecord->getField(FD)->Offset;
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Offset += CastedBase.block()->getDescriptor()->getMetadataSize();
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if (Offset > CastedBase.block()->getSize())
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return std::nullopt;
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if (const RecordDecl *BaseDecl = Base.getDeclPtr().getRecord()->getDecl();
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BaseDecl != FieldParent)
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Offset += Ctx.collectBaseOffset(FieldParent, BaseDecl);
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if (Offset > CastedBase.block()->getSize())
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return std::nullopt;
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assert(Offset <= CastedBase.block()->getSize());
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return Pointer(const_cast<Block *>(Base.block()), Offset, Offset);
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}
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FunctionPointer MemberPointer::toFunctionPointer(const Context &Ctx) const {
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return FunctionPointer(Ctx.getProgram().getFunction(cast<FunctionDecl>(Dcl)));
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}
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APValue MemberPointer::toAPValue(const ASTContext &ASTCtx) const {
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if (isZero())
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return APValue(static_cast<ValueDecl *>(nullptr), /*IsDerivedMember=*/false,
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/*Path=*/{});
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if (hasBase())
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return Base.toAPValue(ASTCtx);
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return APValue(cast<ValueDecl>(getDecl()), /*IsDerivedMember=*/false,
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/*Path=*/{});
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}
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} // namespace interp
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} // namespace clang
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