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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 "GetterSetter.h"
#include "JSGlobalObject.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(ExecState* exec)
{
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());
MarkedArgumentBuffer args;
for (unsigned i = 0; i < exec->argumentCount(); ++i)
args.append(exec->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);
}
CallData callData;
CallType callType = getCallData(exec->vm(), targetFunction, callData);
ASSERT(callType != CallType::None);
return JSValue::encode(call(exec, targetFunction, callType, callData, boundFunction->boundThis(), args));
}
EncodedJSValue JSC_HOST_CALL boundFunctionCall(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());
JSArray* boundArgs = boundFunction->boundArgs();
MarkedArgumentBuffer args;
if (boundArgs) {
for (unsigned i = 0; i < boundArgs->length(); ++i)
args.append(boundArgs->getIndexQuickly(i));
}
for (unsigned i = 0; i < exec->argumentCount(); ++i)
args.append(exec->uncheckedArgument(i));
if (UNLIKELY(args.hasOverflowed())) {
throwOutOfMemoryError(exec, scope);
return encodedJSValue();
}
JSObject* targetFunction = boundFunction->targetFunction();
CallData callData;
CallType callType = getCallData(vm, targetFunction, callData);
ASSERT(callType != CallType::None);
RELEASE_AND_RETURN(scope, JSValue::encode(call(exec, targetFunction, callType, callData, boundFunction->boundThis(), args)));
}
EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionConstruct(ExecState* exec)
{
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());
MarkedArgumentBuffer args;
for (unsigned i = 0; i < exec->argumentCount(); ++i)
args.append(exec->uncheckedArgument(i));
RELEASE_ASSERT(!args.hasOverflowed());
JSFunction* targetFunction = jsCast<JSFunction*>(boundFunction->targetFunction());
ConstructData constructData;
ConstructType constructType = getConstructData(exec->vm(), targetFunction, constructData);
ASSERT(constructType != ConstructType::None);
return JSValue::encode(construct(exec, targetFunction, constructType, constructData, args));
}
EncodedJSValue JSC_HOST_CALL boundFunctionConstruct(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());
JSArray* boundArgs = boundFunction->boundArgs();
MarkedArgumentBuffer args;
if (boundArgs) {
for (unsigned i = 0; i < boundArgs->length(); ++i)
args.append(boundArgs->getIndexQuickly(i));
}
for (unsigned i = 0; i < exec->argumentCount(); ++i)
args.append(exec->uncheckedArgument(i));
if (UNLIKELY(args.hasOverflowed())) {
throwOutOfMemoryError(exec, scope);
return encodedJSValue();
}
JSObject* targetFunction = boundFunction->targetFunction();
ConstructData constructData;
ConstructType constructType = getConstructData(vm, targetFunction, constructData);
ASSERT(constructType != ConstructType::None);
RELEASE_AND_RETURN(scope, JSValue::encode(construct(exec, targetFunction, constructType, constructData, args)));
}
EncodedJSValue JSC_HOST_CALL isBoundFunction(ExecState* exec)
{
return JSValue::encode(JSValue(static_cast<bool>(jsDynamicCast<JSBoundFunction*>(exec->vm(), exec->uncheckedArgument(0)))));
}
EncodedJSValue JSC_HOST_CALL hasInstanceBoundFunction(ExecState* exec)
{
JSBoundFunction* boundObject = jsCast<JSBoundFunction*>(exec->uncheckedArgument(0));
JSValue value = exec->uncheckedArgument(1);
return JSValue::encode(jsBoolean(boundObject->targetFunction()->hasInstance(exec, value)));
}
inline Structure* getBoundFunctionStructure(VM& vm, ExecState* exec, JSGlobalObject* globalObject, JSObject* targetFunction)
{
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue prototype = targetFunction->getPrototype(vm, exec);
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->rareData(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->rareData(vm)->setBoundFunctionStructure(vm, result);
return result;
}
JSBoundFunction* JSBoundFunction::create(VM& vm, ExecState* exec, JSGlobalObject* globalObject, JSObject* targetFunction, JSValue boundThis, JSArray* boundArgs, int length, const String& name)
{
auto scope = DECLARE_THROW_SCOPE(vm);
ConstructData constructData;
ConstructType constructType = JSC::getConstructData(vm, targetFunction, constructData);
bool canConstruct = constructType != ConstructType::None;
bool slowCase = boundArgs || !getJSFunction(targetFunction);
NativeExecutable* executable = vm.getHostFunction(
slowCase ? boundFunctionCall : boundThisNoArgsFunctionCall,
slowCase ? NoIntrinsic : BoundThisNoArgsFunctionCallIntrinsic,
canConstruct ? (slowCase ? boundFunctionConstruct : boundThisNoArgsFunctionConstruct) : callHostFunctionAsConstructor, nullptr,
name);
Structure* structure = getBoundFunctionStructure(vm, exec, globalObject, targetFunction);
RETURN_IF_EXCEPTION(scope, nullptr);
JSBoundFunction* function = new (NotNull, allocateCell<JSBoundFunction>(vm.heap)) JSBoundFunction(vm, globalObject, structure, targetFunction, boundThis, boundArgs);
function->finishCreation(vm, executable, length);
return function;
}
bool JSBoundFunction::customHasInstance(JSObject* object, ExecState* exec, JSValue value)
{
return jsCast<JSBoundFunction*>(object)->m_targetFunction->hasInstance(exec, value);
}
JSBoundFunction::JSBoundFunction(VM& vm, JSGlobalObject* globalObject, Structure* structure, JSObject* targetFunction, JSValue boundThis, JSArray* boundArgs)
: Base(vm, globalObject, structure)
, m_targetFunction(vm, this, targetFunction)
, m_boundThis(vm, this, boundThis)
, m_boundArgs(vm, this, boundArgs, WriteBarrier<JSArray>::MayBeNull)
{
}
JSArray* JSBoundFunction::boundArgsCopy(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSArray* result = constructEmptyArray(exec, nullptr, globalObject(vm));
RETURN_IF_EXCEPTION(scope, nullptr);
for (unsigned i = 0; i < m_boundArgs->length(); ++i) {
result->push(exec, m_boundArgs->getIndexQuickly(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);
}
} // namespace JSC
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