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/*
* Copyright (C) 2014-2023 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 "JSGlobalObject.h"
#include "JSObject.h"
#include "JSScope.h"
namespace JSC {
class JSGlobalObject;
class LLIntOffsetsExtractor;
class JSCallee : public JSNonFinalObject {
friend class JIT;
#if ENABLE(DFG_JIT)
friend class DFG::SpeculativeJIT;
friend class DFG::JITCompiler;
#endif
friend class VM;
public:
using Base = JSNonFinalObject;
static constexpr unsigned StructureFlags = Base::StructureFlags | ImplementsHasInstance | ImplementsDefaultHasInstance;
template<typename CellType, SubspaceAccess>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return &vm.calleeSpace();
}
static JSCallee* create(VM& vm, JSGlobalObject* globalObject, JSScope* scope)
{
JSCallee* callee = new (NotNull, allocateCell<JSCallee>(vm)) JSCallee(vm, scope, globalObject->calleeStructure());
callee->finishCreation(vm);
return callee;
}
JSScope* scope()
{
return m_scope.get();
}
// This method may be called for host functions, in which case it
// will return an arbitrary value. This should only be used for
// optimized paths in which the return value does not matter for
// host functions, and checking whether the function is a host
// function is deemed too expensive.
JSScope* scopeUnchecked()
{
return m_scope.get();
}
void setScope(VM& vm, JSScope* scope)
{
m_scope.set(vm, this, scope);
}
DECLARE_EXPORT_INFO;
inline static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
static constexpr ptrdiff_t offsetOfScopeChain()
{
return OBJECT_OFFSETOF(JSCallee, m_scope);
}
protected:
JSCallee(VM&, JSGlobalObject*, Structure*);
JSCallee(VM&, JSScope*, Structure*);
DECLARE_DEFAULT_FINISH_CREATION;
DECLARE_VISIT_CHILDREN;
private:
friend class LLIntOffsetsExtractor;
WriteBarrier<JSScope> m_scope;
};
} // namespace JSC
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