mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
88 lines
4.3 KiB
C++
88 lines
4.3 KiB
C++
/*
|
|
* Copyright (C) 2015-2020 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 "ArgumentsMode.h"
|
|
#include "JSObject.h"
|
|
|
|
namespace JSC {
|
|
|
|
// This is an Arguments-class object that we create when you do function.arguments, or you say
|
|
// "arguments" inside a function in strict mode. It behaves almpst entirely like an ordinary
|
|
// JavaScript object. All of the arguments values are simply copied from the stack (possibly via
|
|
// some sophisticated ValueRecovery's if an optimizing compiler is in play) and the appropriate
|
|
// properties of the object are populated. The only reason why we need a special class is to make
|
|
// the object claim to be "Arguments" from a toString standpoint, and to avoid materializing the
|
|
// caller/callee/@@iterator properties unless someone asks for them.
|
|
class ClonedArguments final : public JSNonFinalObject {
|
|
public:
|
|
using Base = JSNonFinalObject;
|
|
static constexpr unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesGetOwnSpecialPropertyNames;
|
|
|
|
template<typename CellType, SubspaceAccess mode>
|
|
static IsoSubspace* subspaceFor(VM& vm)
|
|
{
|
|
static_assert(!CellType::needsDestruction, "");
|
|
return &vm.clonedArgumentsSpace;
|
|
}
|
|
|
|
private:
|
|
ClonedArguments(VM&, Structure*, Butterfly*);
|
|
|
|
public:
|
|
static ClonedArguments* createEmpty(VM&, Structure*, JSFunction* callee, unsigned length);
|
|
static ClonedArguments* createEmpty(JSGlobalObject*, JSFunction* callee, unsigned length);
|
|
static ClonedArguments* createWithInlineFrame(JSGlobalObject*, CallFrame* targetFrame, InlineCallFrame*, ArgumentsMode);
|
|
static ClonedArguments* createWithMachineFrame(JSGlobalObject*, CallFrame* targetFrame, ArgumentsMode);
|
|
static ClonedArguments* createByCopyingFrom(JSGlobalObject*, Structure*, Register* argumentsStart, unsigned length, JSFunction* callee);
|
|
|
|
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
|
|
static Structure* createSlowPutStructure(VM&, JSGlobalObject*, JSValue prototype);
|
|
|
|
static void visitChildren(JSCell*, SlotVisitor&);
|
|
|
|
DECLARE_INFO;
|
|
|
|
private:
|
|
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype, IndexingType);
|
|
|
|
static bool getOwnPropertySlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
|
|
static void getOwnSpecialPropertyNames(JSObject*, JSGlobalObject*, PropertyNameArray&, DontEnumPropertiesMode);
|
|
static bool put(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
|
|
static bool deleteProperty(JSCell*, JSGlobalObject*, PropertyName, DeletePropertySlot&);
|
|
static bool defineOwnProperty(JSObject*, JSGlobalObject*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
|
|
|
|
bool specialsMaterialized() const { return !m_callee; }
|
|
void materializeSpecials(JSGlobalObject*);
|
|
void materializeSpecialsIfNecessary(JSGlobalObject*);
|
|
|
|
WriteBarrier<JSFunction> m_callee; // Set to nullptr when we materialize all of our special properties.
|
|
};
|
|
|
|
static const PropertyOffset clonedArgumentsLengthPropertyOffset = 100;
|
|
|
|
} // namespace JSC
|