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/*
* Copyright (C) 2011-2023 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 "JSFunction.h"
#include "JSImmutableButterfly.h"
namespace JSC {
JSC_DECLARE_HOST_FUNCTION(boundThisNoArgsFunctionCall);
JSC_DECLARE_HOST_FUNCTION(boundFunctionCall);
JSC_DECLARE_HOST_FUNCTION(boundFunctionConstruct);
JSC_DECLARE_HOST_FUNCTION(isBoundFunction);
JSC_DECLARE_HOST_FUNCTION(hasInstanceBoundFunction);
class JSBoundFunction final : public JSFunction {
public:
using Base = JSFunction;
static constexpr unsigned StructureFlags = Base::StructureFlags & ~ImplementsDefaultHasInstance;
static_assert(StructureFlags & ImplementsHasInstance);
static constexpr unsigned maxEmbeddedArgs = 3; // Keep sizeof(JSBoundFunction) <= 96.
template<typename CellType, SubspaceAccess mode>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return vm.boundFunctionSpace<mode>();
}
JS_EXPORT_PRIVATE static JSBoundFunction* create(VM&, JSGlobalObject*, JSObject* targetFunction, JSValue boundThis, ArgList, double length, JSString* nameMayBeNull);
static JSBoundFunction* createRaw(VM&, JSGlobalObject*, JSFunction* targetFunction, unsigned boundArgsLength, JSValue boundThis, JSValue arg0, JSValue arg1, JSValue arg2);
static bool customHasInstance(JSObject*, JSGlobalObject*, JSValue);
JSObject* targetFunction() { return m_targetFunction.get(); }
JSValue boundThis() { return m_boundThis.get(); }
unsigned boundArgsLength() const { return m_boundArgsLength; }
JSArray* boundArgsCopy(JSGlobalObject*);
JSString* nameMayBeNull() { return m_nameMayBeNull.get(); }
JSString* name()
{
if (m_nameMayBeNull)
return m_nameMayBeNull.get();
return nameSlow(vm());
}
String nameString()
{
if (!m_nameMayBeNull)
name();
ASSERT(!m_nameMayBeNull->isRope());
bool allocationAllowed = false;
return m_nameMayBeNull->tryGetValue(allocationAllowed);
}
String nameStringWithoutGC(VM& vm)
{
if (m_nameMayBeNull) {
ASSERT(!m_nameMayBeNull->isRope());
bool allocationAllowed = false;
return m_nameMayBeNull->tryGetValue(allocationAllowed);
}
return nameStringWithoutGCSlow(vm);
}
double length(VM& vm)
{
if (std::isnan(m_length))
return lengthSlow(vm);
return m_length;
}
inline static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
static constexpr ptrdiff_t offsetOfTargetFunction() { return OBJECT_OFFSETOF(JSBoundFunction, m_targetFunction); }
static constexpr ptrdiff_t offsetOfBoundThis() { return OBJECT_OFFSETOF(JSBoundFunction, m_boundThis); }
static constexpr ptrdiff_t offsetOfBoundArgs() { return OBJECT_OFFSETOF(JSBoundFunction, m_boundArgs); }
static constexpr ptrdiff_t offsetOfBoundArgsLength() { return OBJECT_OFFSETOF(JSBoundFunction, m_boundArgsLength); }
static constexpr ptrdiff_t offsetOfNameMayBeNull() { return OBJECT_OFFSETOF(JSBoundFunction, m_nameMayBeNull); }
static constexpr ptrdiff_t offsetOfLength() { return OBJECT_OFFSETOF(JSBoundFunction, m_length); }
static constexpr ptrdiff_t offsetOfCanConstruct() { return OBJECT_OFFSETOF(JSBoundFunction, m_canConstruct); }
template<typename Functor>
void forEachBoundArg(const Functor& func)
{
unsigned length = boundArgsLength();
if (!length)
return;
if (length <= m_boundArgs.size()) {
for (unsigned index = 0; index < length; ++index) {
if (func(m_boundArgs[index].get()) == IterationStatus::Done)
return;
}
return;
}
for (unsigned index = 0; index < length; ++index) {
if (func(jsCast<JSImmutableButterfly*>(m_boundArgs[0].get())->get(index)) == IterationStatus::Done)
return;
}
}
bool canConstruct()
{
if (m_canConstruct == TriState::Indeterminate)
return canConstructSlow();
return m_canConstruct == TriState::True;
}
static bool canSkipNameAndLengthMaterialization(JSGlobalObject*, Structure*);
DECLARE_INFO;
private:
JSBoundFunction(VM&, NativeExecutable*, JSGlobalObject*, Structure*, JSObject* targetFunction, JSValue boundThis, unsigned boundArgsLength, JSValue arg0, JSValue arg1, JSValue arg2, JSString* nameMayBeNull, double length);
JSString* nameSlow(VM&);
double lengthSlow(VM&);
bool canConstructSlow();
String nameStringWithoutGCSlow(VM&);
DECLARE_DEFAULT_FINISH_CREATION;
DECLARE_VISIT_CHILDREN;
WriteBarrier<JSObject> m_targetFunction;
WriteBarrier<Unknown> m_boundThis;
std::array<WriteBarrier<Unknown>, maxEmbeddedArgs> m_boundArgs { };
WriteBarrier<JSString> m_nameMayBeNull;
double m_length { PNaN };
unsigned m_boundArgsLength { 0 };
TriState m_canConstruct { TriState::Indeterminate };
};
JSC_DECLARE_HOST_FUNCTION(boundFunctionCall);
JSC_DECLARE_HOST_FUNCTION(boundFunctionConstruct);
JSC_DECLARE_HOST_FUNCTION(boundThisNoArgsFunctionCall);
} // namespace JSC
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