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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/builtins/builtins-utils-gen.h"
#include "src/builtins/builtins-utils.h"
#include "src/builtins/builtins.h"
#include "src/code-stub-assembler.h"
#include "src/counters.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
using compiler::Node;
using compiler::CodeAssembler;
// ES6 section 26.2.1.1 Proxy ( target, handler ) for the [[Call]] case.
TF_BUILTIN(ProxyConstructor, CodeStubAssembler) {
Node* context = Parameter(Descriptor::kContext);
ThrowTypeError(context, MessageTemplate::kConstructorNotFunction, "Proxy");
}
class ProxiesCodeStubAssembler : public CodeStubAssembler {
public:
explicit ProxiesCodeStubAssembler(compiler::CodeAssemblerState* state)
: CodeStubAssembler(state) {}
Node* IsProxyRevoked(Node* proxy) {
CSA_ASSERT(this, IsJSProxy(proxy));
Node* handler = LoadObjectField(proxy, JSProxy::kHandlerOffset);
CSA_ASSERT(this, Word32Or(IsJSReceiver(handler), IsNull(handler)));
return IsNull(handler);
}
void GotoIfProxyRevoked(Node* object, Label* if_proxy_revoked) {
Label continue_checks(this);
GotoIfNot(IsJSProxy(object), &continue_checks);
GotoIf(IsProxyRevoked(object), if_proxy_revoked);
Goto(&continue_checks);
BIND(&continue_checks);
}
Node* AllocateProxy(Node* target, Node* handler, Node* context) {
VARIABLE(map, MachineRepresentation::kTagged);
Label callable_target(this), constructor_target(this), none_target(this),
create_proxy(this);
Node* nativeContext = LoadNativeContext(context);
Branch(IsCallable(target), &callable_target, &none_target);
BIND(&callable_target);
{
// Every object that is a constructor is implicitly callable
// so it's okay to nest this check here
GotoIf(IsConstructor(target), &constructor_target);
map.Bind(
LoadContextElement(nativeContext, Context::PROXY_CALLABLE_MAP_INDEX));
Goto(&create_proxy);
}
BIND(&constructor_target);
{
map.Bind(LoadContextElement(nativeContext,
Context::PROXY_CONSTRUCTOR_MAP_INDEX));
Goto(&create_proxy);
}
BIND(&none_target);
{
map.Bind(LoadContextElement(nativeContext, Context::PROXY_MAP_INDEX));
Goto(&create_proxy);
}
BIND(&create_proxy);
Node* proxy = Allocate(JSProxy::kSize);
StoreMapNoWriteBarrier(proxy, map.value());
StoreObjectFieldRoot(proxy, JSProxy::kPropertiesOrHashOffset,
Heap::kEmptyPropertiesDictionaryRootIndex);
StoreObjectFieldNoWriteBarrier(proxy, JSProxy::kTargetOffset, target);
StoreObjectFieldNoWriteBarrier(proxy, JSProxy::kHandlerOffset, handler);
StoreObjectFieldNoWriteBarrier(proxy, JSProxy::kHashOffset,
UndefinedConstant());
return proxy;
}
Node* AllocateJSArrayForCodeStubArguments(Node* context,
CodeStubArguments& args, Node* argc,
ParameterMode mode) {
Node* array = nullptr;
Node* elements = nullptr;
Node* native_context = LoadNativeContext(context);
Node* array_map = LoadJSArrayElementsMap(PACKED_ELEMENTS, native_context);
Node* argc_smi = ParameterToTagged(argc, mode);
std::tie(array, elements) = AllocateUninitializedJSArrayWithElements(
PACKED_ELEMENTS, array_map, argc_smi, nullptr, argc, INTPTR_PARAMETERS);
StoreMapNoWriteBarrier(elements, Heap::kFixedArrayMapRootIndex);
StoreObjectFieldNoWriteBarrier(elements, FixedArrayBase::kLengthOffset,
argc_smi);
VARIABLE(index, MachineType::PointerRepresentation());
index.Bind(IntPtrConstant(FixedArrayBase::kHeaderSize - kHeapObjectTag));
VariableList list({&index}, zone());
args.ForEach(list, [this, elements, &index](Node* arg) {
StoreNoWriteBarrier(MachineRepresentation::kTagged, elements,
index.value(), arg);
Increment(index, kPointerSize);
});
return array;
}
};
// ES6 section 26.2.1.1 Proxy ( target, handler ) for the [[Construct]] case.
TF_BUILTIN(ProxyConstructor_ConstructStub, ProxiesCodeStubAssembler) {
int const kTargetArg = 0;
int const kHandlerArg = 1;
Node* argc =
ChangeInt32ToIntPtr(Parameter(BuiltinDescriptor::kArgumentsCount));
CodeStubArguments args(this, argc);
Node* target = args.GetOptionalArgumentValue(kTargetArg);
Node* handler = args.GetOptionalArgumentValue(kHandlerArg);
Node* context = Parameter(BuiltinDescriptor::kContext);
Label throw_proxy_non_object(this, Label::kDeferred),
throw_proxy_handler_or_target_revoked(this, Label::kDeferred),
return_create_proxy(this);
GotoIf(TaggedIsSmi(target), &throw_proxy_non_object);
GotoIfNot(IsJSReceiver(target), &throw_proxy_non_object);
GotoIfProxyRevoked(target, &throw_proxy_handler_or_target_revoked);
GotoIf(TaggedIsSmi(handler), &throw_proxy_non_object);
GotoIfNot(IsJSReceiver(handler), &throw_proxy_non_object);
GotoIfProxyRevoked(handler, &throw_proxy_handler_or_target_revoked);
args.PopAndReturn(AllocateProxy(target, handler, context));
BIND(&throw_proxy_non_object);
ThrowTypeError(context, MessageTemplate::kProxyNonObject);
BIND(&throw_proxy_handler_or_target_revoked);
ThrowTypeError(context, MessageTemplate::kProxyHandlerOrTargetRevoked);
}
TF_BUILTIN(CallProxy, ProxiesCodeStubAssembler) {
Node* argc = Parameter(Descriptor::kActualArgumentsCount);
Node* argc_ptr = ChangeInt32ToIntPtr(argc);
Node* proxy = Parameter(Descriptor::kFunction);
Node* context = Parameter(Descriptor::kContext);
CSA_ASSERT(this, IsJSProxy(proxy));
CSA_ASSERT(this, IsCallable(proxy));
Label throw_proxy_handler_revoked(this, Label::kDeferred),
trap_undefined(this), trap_defined(this, Label::kDeferred);
// 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Node* handler = LoadObjectField(proxy, JSProxy::kHandlerOffset);
// 2. If handler is null, throw a TypeError exception.
CSA_ASSERT(this, Word32Or(IsJSReceiver(handler), IsNull(handler)));
GotoIf(IsNull(handler), &throw_proxy_handler_revoked);
// 3. Assert: Type(handler) is Object.
CSA_ASSERT(this, IsJSReceiver(handler));
// 4. Let target be the value of the [[ProxyTarget]] internal slot of O.
Node* target = LoadObjectField(proxy, JSProxy::kTargetOffset);
// 5. Let trap be ? GetMethod(handler, "apply").
Handle<Name> trap_name = factory()->apply_string();
Node* trap = GetProperty(context, handler, trap_name);
// 6. If trap is undefined, then
GotoIf(IsUndefined(trap), &trap_undefined);
Branch(IsNull(trap), &trap_undefined, &trap_defined);
BIND(&trap_defined);
{
CodeStubArguments args(this, argc_ptr);
Node* receiver = args.GetReceiver();
// 7. Let argArray be CreateArrayFromList(argumentsList).
Node* array = AllocateJSArrayForCodeStubArguments(context, args, argc_ptr,
INTPTR_PARAMETERS);
// 8. Return Call(trap, handler, «target, thisArgument, argArray»).
Node* result = CallJS(CodeFactory::Call(isolate()), context, trap, handler,
target, receiver, array);
args.PopAndReturn(result);
}
BIND(&trap_undefined);
{
// 6.a. Return Call(target, thisArgument, argumentsList).
TailCallStub(CodeFactory::Call(isolate()), context, target, argc);
}
BIND(&throw_proxy_handler_revoked);
{
CallRuntime(Runtime::kThrowTypeError, context,
SmiConstant(MessageTemplate::kProxyRevoked),
StringConstant("apply"));
Unreachable();
}
}
} // namespace internal
} // namespace v8
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