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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Reference.h>
namespace JS {
// 6.2.4.6 PutValue ( V, W ), https://tc39.es/ecma262/#sec-putvalue
ThrowCompletionOr<void> Reference::put_value(VM& vm, Value value)
{
// 1. ReturnIfAbrupt(V).
// 2. ReturnIfAbrupt(W).
// 3. If V is not a Reference Record, throw a ReferenceError exception.
if (!is_valid_reference())
return vm.throw_completion<ReferenceError>(ErrorType::InvalidLeftHandAssignment);
// 4. If IsUnresolvableReference(V) is true, then
if (is_unresolvable()) {
// a. If V.[[Strict]] is true, throw a ReferenceError exception.
if (m_strict)
return throw_reference_error(vm);
// b. Let globalObj be GetGlobalObject().
auto& global_object = vm.get_global_object();
// c. Perform ? Set(globalObj, V.[[ReferencedName]], W, false).
TRY(global_object.set(m_name, value, Object::ShouldThrowExceptions::No));
// Return unused.
return {};
}
// 5. If IsPropertyReference(V) is true, then
if (is_property_reference()) {
// a. Let baseObj be ? ToObject(V.[[Base]]).
auto* base_obj = TRY(m_base_value.to_object(vm));
// b. If IsPrivateReference(V) is true, then
if (is_private_reference()) {
// i. Return ? PrivateSet(baseObj, V.[[ReferencedName]], W).
return base_obj->private_set(m_private_name, value);
}
// c. Let succeeded be ? baseObj.[[Set]](V.[[ReferencedName]], W, GetThisValue(V)).
auto succeeded = TRY(base_obj->internal_set(m_name, value, get_this_value()));
// d. If succeeded is false and V.[[Strict]] is true, throw a TypeError exception.
if (!succeeded && m_strict)
return vm.throw_completion<TypeError>(ErrorType::ReferenceNullishSetProperty, m_name, TRY_OR_THROW_OOM(vm, m_base_value.to_string_without_side_effects()));
// e. Return unused.
return {};
}
// 6. Else,
// a. Let base be V.[[Base]].
// b. Assert: base is an Environment Record.
VERIFY(m_base_type == BaseType::Environment);
VERIFY(m_base_environment);
// c. Return ? base.SetMutableBinding(V.[[ReferencedName]], W, V.[[Strict]]) (see 9.1).
if (m_environment_coordinate.has_value() && m_environment_coordinate->index != EnvironmentCoordinate::global_marker)
return static_cast<DeclarativeEnvironment*>(m_base_environment)->set_mutable_binding_direct(vm, m_environment_coordinate->index, value, m_strict);
else
return m_base_environment->set_mutable_binding(vm, m_name.as_string(), value, m_strict);
}
Completion Reference::throw_reference_error(VM& vm) const
{
if (!m_name.is_valid())
return vm.throw_completion<ReferenceError>(ErrorType::ReferenceUnresolvable);
else
return vm.throw_completion<ReferenceError>(ErrorType::UnknownIdentifier, m_name.to_string_or_symbol().to_display_string());
}
// 6.2.4.5 GetValue ( V ), https://tc39.es/ecma262/#sec-getvalue
ThrowCompletionOr<Value> Reference::get_value(VM& vm) const
{
auto& realm = *vm.current_realm();
// 1. ReturnIfAbrupt(V).
// 2. If V is not a Reference Record, return V.
// 3. If IsUnresolvableReference(V) is true, throw a ReferenceError exception.
if (!is_valid_reference() || is_unresolvable())
return throw_reference_error(vm);
// 4. If IsPropertyReference(V) is true, then
if (is_property_reference()) {
// a. Let baseObj be ? ToObject(V.[[Base]]).
// NOTE: Deferred as an optimization; we might not actually need to create an object.
// b. If IsPrivateReference(V) is true, then
if (is_private_reference()) {
// FIXME: We need to be able to specify the receiver for this
// if we want to use it in error messages in future
// as things currently stand this does the "wrong thing" but
// the error is unobservable
auto* base_obj = TRY(m_base_value.to_object(vm));
// i. Return ? PrivateGet(baseObj, V.[[ReferencedName]]).
return base_obj->private_get(m_private_name);
}
// OPTIMIZATION: For various primitives we can avoid actually creating a new object for them.
Object* base_obj = nullptr;
if (m_base_value.is_string()) {
auto string_value = TRY(m_base_value.as_string().get(vm, m_name));
if (string_value.has_value())
return *string_value;
base_obj = realm.intrinsics().string_prototype();
} else if (m_base_value.is_number())
base_obj = realm.intrinsics().number_prototype();
else if (m_base_value.is_boolean())
base_obj = realm.intrinsics().boolean_prototype();
else
base_obj = TRY(m_base_value.to_object(vm));
// c. Return ? baseObj.[[Get]](V.[[ReferencedName]], GetThisValue(V)).
return base_obj->internal_get(m_name, get_this_value());
}
// 5. Else,
// a. Let base be V.[[Base]].
// b. Assert: base is an Environment Record.
VERIFY(m_base_type == BaseType::Environment);
VERIFY(m_base_environment);
// c. Return ? base.GetBindingValue(V.[[ReferencedName]], V.[[Strict]]) (see 9.1).
if (m_environment_coordinate.has_value() && m_environment_coordinate->index != EnvironmentCoordinate::global_marker)
return static_cast<DeclarativeEnvironment*>(m_base_environment)->get_binding_value_direct(vm, m_environment_coordinate->index, m_strict);
return m_base_environment->get_binding_value(vm, m_name.as_string(), m_strict);
}
// 13.5.1.2 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-delete-operator-runtime-semantics-evaluation
ThrowCompletionOr<bool> Reference::delete_(VM& vm)
{
// 13.5.1.2 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-delete-operator-runtime-semantics-evaluation
// UnaryExpression : delete UnaryExpression
// NOTE: The following steps have already been evaluated by the time we get here:
// 1. Let ref be the result of evaluating UnaryExpression.
// 2. ReturnIfAbrupt(ref).
// 3. If ref is not a Reference Record, return true.
// 4. If IsUnresolvableReference(ref) is true, then
if (is_unresolvable()) {
// a. Assert: ref.[[Strict]] is false.
VERIFY(!m_strict);
// b. Return true.
return true;
}
// 5. If IsPropertyReference(ref) is true, then
if (is_property_reference()) {
// a. Assert: IsPrivateReference(ref) is false.
VERIFY(!is_private_reference());
// b. If IsSuperReference(ref) is true, throw a ReferenceError exception.
if (is_super_reference())
return vm.throw_completion<ReferenceError>(ErrorType::UnsupportedDeleteSuperProperty);
// c. Let baseObj be ! ToObject(ref.[[Base]]).
auto* base_obj = MUST(m_base_value.to_object(vm));
// d. Let deleteStatus be ? baseObj.[[Delete]](ref.[[ReferencedName]]).
bool delete_status = TRY(base_obj->internal_delete(m_name));
// e. If deleteStatus is false and ref.[[Strict]] is true, throw a TypeError exception.
if (!delete_status && m_strict)
return vm.throw_completion<TypeError>(ErrorType::ReferenceNullishDeleteProperty, m_name, TRY_OR_THROW_OOM(vm, m_base_value.to_string_without_side_effects()));
// f. Return deleteStatus.
return delete_status;
}
// 6. Else,
// a. Let base be ref.[[Base]].
// b. Assert: base is an Environment Record.
VERIFY(m_base_type == BaseType::Environment);
// c. Return ? base.DeleteBinding(ref.[[ReferencedName]]).
return m_base_environment->delete_binding(vm, m_name.as_string());
}
// 6.2.4.8 InitializeReferencedBinding ( V, W ), https://tc39.es/ecma262/#sec-object.prototype.hasownproperty
// 1.2.1.1 InitializeReferencedBinding ( V, W, hint ), https://tc39.es/proposal-explicit-resource-management/#sec-initializereferencedbinding
ThrowCompletionOr<void> Reference::initialize_referenced_binding(VM& vm, Value value, Environment::InitializeBindingHint hint) const
{
VERIFY(!is_unresolvable());
VERIFY(m_base_type == BaseType::Environment);
return m_base_environment->initialize_binding(vm, m_name.as_string(), value, hint);
}
// 6.2.4.9 MakePrivateReference ( baseValue, privateIdentifier ), https://tc39.es/ecma262/#sec-makeprivatereference
Reference make_private_reference(VM& vm, Value base_value, DeprecatedFlyString const& private_identifier)
{
// 1. Let privEnv be the running execution context's PrivateEnvironment.
auto private_environment = vm.running_execution_context().private_environment;
// 2. Assert: privEnv is not null.
VERIFY(private_environment);
// 3. Let privateName be ResolvePrivateIdentifier(privEnv, privateIdentifier).
auto private_name = private_environment->resolve_private_identifier(private_identifier);
// 4. Return the Reference Record { [[Base]]: baseValue, [[ReferencedName]]: privateName, [[Strict]]: true, [[ThisValue]]: empty }.
return Reference { base_value, private_name };
}
}
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