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/*
* Copyright (C) 2018-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ConcurrentJSLock.h"
#include "IsoSubspace.h"
#include "JSCast.h"
#include "VM.h"
namespace JSC {
class CodeBlock;
class LLIntOffsetsExtractor;
class ExecutableToCodeBlockEdge final : public JSCell {
public:
typedef JSCell Base;
static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
template<typename CellType, SubspaceAccess>
static IsoSubspace* subspaceFor(VM& vm)
{
return &vm.executableToCodeBlockEdgeSpace();
}
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
static ExecutableToCodeBlockEdge* create(VM&, CodeBlock*);
DECLARE_INFO;
CodeBlock* codeBlock() const { return m_codeBlock.get(); }
DECLARE_VISIT_CHILDREN;
DECLARE_VISIT_OUTPUT_CONSTRAINTS;
void finalizeUnconditionally(VM&);
static CodeBlock* unwrap(ExecutableToCodeBlockEdge* edge)
{
if (!edge)
return nullptr;
return edge->codeBlock();
}
static CodeBlock* deactivateAndUnwrap(ExecutableToCodeBlockEdge* edge);
static ExecutableToCodeBlockEdge* wrap(CodeBlock* codeBlock);
static ExecutableToCodeBlockEdge* wrapAndActivate(CodeBlock* codeBlock);
static ptrdiff_t offsetOfCodeBlock() { return OBJECT_OFFSETOF(ExecutableToCodeBlockEdge, m_codeBlock); }
private:
friend class LLIntOffsetsExtractor;
ExecutableToCodeBlockEdge(VM&, CodeBlock*);
void finishCreation(VM&);
void activate();
void deactivate();
bool isActive() const;
template<typename Visitor> void runConstraint(const ConcurrentJSLocker&, VM&, Visitor&);
WriteBarrier<CodeBlock> m_codeBlock;
};
} // namespace JSC