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/*
* Copyright (C) 2011, 2016-2017 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.
*/
#include "config.h"
#include "JSBoundFunction.h"
#include "ExecutableBaseInlines.h"
#include "JSCInlines.h"
namespace JSC {
const ClassInfo JSBoundFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSBoundFunction) };
EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionCall(JSGlobalObject* globalObject, CallFrame* callFrame)
{
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(callFrame->jsCallee());
JSImmutableButterfly* boundArgs = boundFunction->boundArgs();
MarkedArgumentBuffer args;
if (boundArgs) {
// Starts with 1 since the first one is |this|.
for (unsigned i = 1; i < boundArgs->length(); ++i)
args.append(boundArgs->get(i));
}
for (unsigned i = 0; i < callFrame->argumentCount(); ++i)
args.append(callFrame->uncheckedArgument(i));
RELEASE_ASSERT(!args.hasOverflowed());
JSFunction* targetFunction = jsCast<JSFunction*>(boundFunction->targetFunction());
ExecutableBase* executable = targetFunction->executable();
if (executable->hasJITCodeForCall()) {
// Force the executable to cache its arity entrypoint.
executable->entrypointFor(CodeForCall, MustCheckArity);
}
auto callData = getCallData(globalObject->vm(), targetFunction);
ASSERT(callData.type != CallData::Type::None);
return JSValue::encode(call(globalObject, targetFunction, callData, boundFunction->boundThis(), args));
}
EncodedJSValue JSC_HOST_CALL boundFunctionCall(JSGlobalObject* globalObject, CallFrame* callFrame)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(callFrame->jsCallee());
JSImmutableButterfly* boundArgs = boundFunction->boundArgs();
MarkedArgumentBuffer args;
if (boundArgs) {
// Starts with 1 since the first one is |this|.
for (unsigned i = 1; i < boundArgs->length(); ++i)
args.append(boundArgs->get(i));
}
for (unsigned i = 0; i < callFrame->argumentCount(); ++i)
args.append(callFrame->uncheckedArgument(i));
if (UNLIKELY(args.hasOverflowed())) {
throwOutOfMemoryError(globalObject, scope);
return encodedJSValue();
}
JSObject* targetFunction = boundFunction->targetFunction();
auto callData = getCallData(vm, targetFunction);
ASSERT(callData.type != CallData::Type::None);
RELEASE_AND_RETURN(scope, JSValue::encode(call(globalObject, targetFunction, callData, boundFunction->boundThis(), args)));
}
EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionConstruct(JSGlobalObject* globalObject, CallFrame* callFrame)
{
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(callFrame->jsCallee());
JSImmutableButterfly* boundArgs = boundFunction->boundArgs();
MarkedArgumentBuffer args;
if (boundArgs) {
// Starts with 1 since the first one is |this|.
for (unsigned i = 1; i < boundArgs->length(); ++i)
args.append(boundArgs->get(i));
}
for (unsigned i = 0; i < callFrame->argumentCount(); ++i)
args.append(callFrame->uncheckedArgument(i));
RELEASE_ASSERT(!args.hasOverflowed());
JSFunction* targetFunction = jsCast<JSFunction*>(boundFunction->targetFunction());
auto constructData = getConstructData(globalObject->vm(), targetFunction);
ASSERT(constructData.type != CallData::Type::None);
JSValue newTarget = callFrame->newTarget();
if (newTarget == boundFunction)
newTarget = targetFunction;
return JSValue::encode(construct(globalObject, targetFunction, constructData, args, newTarget));
}
EncodedJSValue JSC_HOST_CALL boundFunctionConstruct(JSGlobalObject* globalObject, CallFrame* callFrame)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(callFrame->jsCallee());
JSImmutableButterfly* boundArgs = boundFunction->boundArgs();
MarkedArgumentBuffer args;
if (boundArgs) {
// Starts with 1 since the first one is |this|.
for (unsigned i = 1; i < boundArgs->length(); ++i)
args.append(boundArgs->get(i));
}
for (unsigned i = 0; i < callFrame->argumentCount(); ++i)
args.append(callFrame->uncheckedArgument(i));
if (UNLIKELY(args.hasOverflowed())) {
throwOutOfMemoryError(globalObject, scope);
return encodedJSValue();
}
JSObject* targetFunction = boundFunction->targetFunction();
auto constructData = getConstructData(vm, targetFunction);
ASSERT(constructData.type != CallData::Type::None);
JSValue newTarget = callFrame->newTarget();
if (newTarget == boundFunction)
newTarget = targetFunction;
RELEASE_AND_RETURN(scope, JSValue::encode(construct(globalObject, targetFunction, constructData, args, newTarget)));
}
EncodedJSValue JSC_HOST_CALL isBoundFunction(JSGlobalObject* globalObject, CallFrame* callFrame)
{
return JSValue::encode(JSValue(static_cast<bool>(jsDynamicCast<JSBoundFunction*>(globalObject->vm(), callFrame->uncheckedArgument(0)))));
}
EncodedJSValue JSC_HOST_CALL hasInstanceBoundFunction(JSGlobalObject* globalObject, CallFrame* callFrame)
{
JSBoundFunction* boundObject = jsCast<JSBoundFunction*>(callFrame->uncheckedArgument(0));
JSValue value = callFrame->uncheckedArgument(1);
return JSValue::encode(jsBoolean(boundObject->targetFunction()->hasInstance(globalObject, value)));
}
inline Structure* getBoundFunctionStructure(VM& vm, JSGlobalObject* globalObject, JSObject* targetFunction)
{
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue prototype = targetFunction->getPrototype(vm, globalObject);
RETURN_IF_EXCEPTION(scope, nullptr);
JSFunction* targetJSFunction = jsDynamicCast<JSFunction*>(vm, targetFunction);
// We only cache the structure of the bound function if the bindee is a JSFunction since there
// isn't any good place to put the structure on Internal Functions.
if (targetJSFunction) {
Structure* structure = targetJSFunction->ensureRareData(vm)->getBoundFunctionStructure();
if (structure && structure->storedPrototype() == prototype && structure->globalObject() == globalObject)
return structure;
}
Structure* result = globalObject->boundFunctionStructure();
// It would be nice if the structure map was keyed global objects in addition to the other things. Unfortunately, it is not
// currently. Whoever works on caching structure changes for prototype transitions should consider this problem as well.
// See: https://bugs.webkit.org/show_bug.cgi?id=152738
if (prototype.isObject() && prototype.getObject()->globalObject(vm) == globalObject) {
result = vm.structureCache.emptyStructureForPrototypeFromBaseStructure(globalObject, prototype.getObject(), result);
ASSERT_WITH_SECURITY_IMPLICATION(result->globalObject() == globalObject);
} else
result = Structure::create(vm, globalObject, prototype, result->typeInfo(), result->classInfo());
if (targetJSFunction)
targetJSFunction->ensureRareData(vm)->setBoundFunctionStructure(vm, result);
return result;
}
JSBoundFunction* JSBoundFunction::create(VM& vm, JSGlobalObject* globalObject, JSObject* targetFunction, JSValue boundThis, JSImmutableButterfly* boundArgs, int length, JSString* nameMayBeNull)
{
auto scope = DECLARE_THROW_SCOPE(vm);
if (nameMayBeNull) {
nameMayBeNull->value(globalObject); // Resolving rope.
RETURN_IF_EXCEPTION(scope, nullptr);
}
bool isJSFunction = getJSFunction(targetFunction);
bool canConstruct = targetFunction->isConstructor(vm);
NativeExecutable* executable = vm.getBoundFunction(isJSFunction, canConstruct);
Structure* structure = getBoundFunctionStructure(vm, globalObject, targetFunction);
RETURN_IF_EXCEPTION(scope, nullptr);
JSBoundFunction* function = new (NotNull, allocateCell<JSBoundFunction>(vm.heap)) JSBoundFunction(vm, executable, globalObject, structure, targetFunction, boundThis, boundArgs, nameMayBeNull, length);
function->finishCreation(vm, executable, length);
return function;
}
bool JSBoundFunction::customHasInstance(JSObject* object, JSGlobalObject* globalObject, JSValue value)
{
return jsCast<JSBoundFunction*>(object)->m_targetFunction->hasInstance(globalObject, value);
}
JSBoundFunction::JSBoundFunction(VM& vm, NativeExecutable* executable, JSGlobalObject* globalObject, Structure* structure, JSObject* targetFunction, JSValue boundThis, JSImmutableButterfly* boundArgs, JSString* nameMayBeNull, int length)
: Base(vm, executable, globalObject, structure)
, m_targetFunction(vm, this, targetFunction)
, m_boundThis(vm, this, boundThis)
, m_boundArgs(vm, this, boundArgs, WriteBarrier<JSImmutableButterfly>::MayBeNull)
, m_nameMayBeNull(vm, this, nameMayBeNull, WriteBarrier<JSString>::MayBeNull)
, m_length(length)
{
ASSERT(!m_nameMayBeNull || !m_nameMayBeNull->isRope());
}
JSArray* JSBoundFunction::boundArgsCopy(JSGlobalObject* globalObject)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSArray* result = constructEmptyArray(this->globalObject(), nullptr);
RETURN_IF_EXCEPTION(scope, nullptr);
if (m_boundArgs) {
// Starts with 1 since the first one is bound |this|.
for (unsigned i = 1; i < m_boundArgs->length(); ++i) {
result->push(globalObject, m_boundArgs->get(i));
RETURN_IF_EXCEPTION(scope, nullptr);
}
}
return result;
}
void JSBoundFunction::finishCreation(VM& vm, NativeExecutable* executable, int length)
{
String name; // We lazily create our 'name' string property.
Base::finishCreation(vm, executable, length, name);
ASSERT(inherits(vm, info()));
}
void JSBoundFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSBoundFunction* thisObject = jsCast<JSBoundFunction*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(thisObject->m_targetFunction);
visitor.append(thisObject->m_boundThis);
visitor.append(thisObject->m_boundArgs);
visitor.append(thisObject->m_nameMayBeNull);
}
} // namespace JSC