76f17f7703
Allow having separate GC heaps and implement coordinated marking between them; this is useful for keeping wasm and js GC heaps separated with a clear boundary.
77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
/*
|
|
* Copyright (c) 2026, Ali Mohammad Pur <ali@ladybird.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <LibGC/Cell.h>
|
|
#include <LibGC/Forward.h>
|
|
#include <LibGC/Internals.h>
|
|
|
|
namespace GC {
|
|
|
|
// A strong reference from a cell on one heap to a cell on another heap in the same HeapGroup.
|
|
class GC_API CrossHeapMemberBase {
|
|
AK_MAKE_NONCOPYABLE(CrossHeapMemberBase);
|
|
AK_MAKE_NONMOVABLE(CrossHeapMemberBase);
|
|
|
|
public:
|
|
Cell* cell_base() const { return static_cast<Cell*>(m_cell); }
|
|
|
|
void detach_from_heap(Badge<Heap>)
|
|
{
|
|
m_registered_heap = nullptr;
|
|
m_cell = nullptr;
|
|
}
|
|
|
|
protected:
|
|
explicit CrossHeapMemberBase(Cell* cell)
|
|
{
|
|
reset(cell);
|
|
}
|
|
|
|
~CrossHeapMemberBase()
|
|
{
|
|
reset(nullptr);
|
|
}
|
|
|
|
void reset(Cell* cell);
|
|
|
|
void* m_cell { nullptr }; // Not a member of "this" heap.
|
|
Heap* m_registered_heap { nullptr };
|
|
};
|
|
|
|
template<typename T>
|
|
class CrossHeapMember final : public CrossHeapMemberBase {
|
|
public:
|
|
CrossHeapMember()
|
|
: CrossHeapMemberBase(nullptr)
|
|
{
|
|
}
|
|
|
|
explicit CrossHeapMember(T* cell)
|
|
: CrossHeapMemberBase(cell)
|
|
{
|
|
}
|
|
|
|
CrossHeapMember& operator=(T* cell)
|
|
{
|
|
reset(cell);
|
|
return *this;
|
|
}
|
|
|
|
T* ptr() const { return static_cast<T*>(m_cell); }
|
|
T* operator->() const { return ptr(); }
|
|
explicit operator bool() const { return m_cell != nullptr; }
|
|
|
|
// Called by the holder heap.
|
|
void visit(Cell::Visitor& visitor) const
|
|
{
|
|
if (m_cell)
|
|
visitor.visit(cell_base());
|
|
}
|
|
};
|
|
|
|
}
|