199 lines
8 KiB
C++
199 lines
8 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/FunctionEnvironment.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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NativeFunction* NativeFunction::create(GlobalObject& global_object, const FlyString& name, Function<ThrowCompletionOr<Value>(VM&, GlobalObject&)> function)
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{
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return global_object.heap().allocate<NativeFunction>(global_object, name, move(function), *global_object.function_prototype());
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}
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// FIXME: m_realm is supposed to be the realm argument of CreateBuiltinFunction, or the current
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// Realm Record. The former is not something that's commonly used or we support, the
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// latter is impossible as no ExecutionContext exists when most NativeFunctions are created...
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NativeFunction::NativeFunction(Object& prototype)
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: FunctionObject(prototype)
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, m_realm(global_object().associated_realm())
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{
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}
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NativeFunction::NativeFunction(FlyString name, Function<ThrowCompletionOr<Value>(VM&, GlobalObject&)> native_function, Object& prototype)
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: FunctionObject(prototype)
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, m_name(move(name))
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, m_native_function(move(native_function))
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, m_realm(global_object().associated_realm())
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{
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}
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NativeFunction::NativeFunction(FlyString name, Object& prototype)
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: FunctionObject(prototype)
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, m_name(move(name))
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, m_realm(global_object().associated_realm())
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{
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}
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NativeFunction::~NativeFunction()
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{
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}
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// NOTE: Do not attempt to DRY these, it's not worth it. The difference in return types (Value vs Object*),
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// called functions (call() vs construct(FunctionObject&)), and this value (passed vs uninitialized) make
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// these good candidates for a bit of code duplication :^)
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// 10.3.1 [[Call]] ( thisArgument, argumentsList ), https://tc39.es/ecma262/#sec-built-in-function-objects-call-thisargument-argumentslist
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ThrowCompletionOr<Value> NativeFunction::internal_call(Value this_argument, MarkedValueList arguments_list)
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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// 1. Let callerContext be the running execution context.
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auto& caller_context = vm.running_execution_context();
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// 2. If callerContext is not already suspended, suspend callerContext.
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// NOTE: We don't support this concept yet.
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// 3. Let calleeContext be a new execution context.
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ExecutionContext callee_context(heap());
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// 4. Set the Function of calleeContext to F.
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callee_context.function = this;
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callee_context.function_name = m_name;
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// 5. Let calleeRealm be F.[[Realm]].
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auto* callee_realm = m_realm;
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// NOTE: This non-standard fallback is needed until we can guarantee that literally
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// every function has a realm - especially in LibWeb that's sometimes not the case
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// when a function is created while no JS is running, as we currently need to rely on
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// that (:acid2:, I know - see set_event_handler_attribute() for an example).
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// If there's no 'current realm' either, we can't continue and crash.
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if (!callee_realm)
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callee_realm = vm.current_realm();
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VERIFY(callee_realm);
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// 6. Set the Realm of calleeContext to calleeRealm.
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callee_context.realm = callee_realm;
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// 7. Set the ScriptOrModule of calleeContext to null.
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// Note: This is already the default value.
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// 8. Perform any necessary implementation-defined initialization of calleeContext.
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callee_context.this_value = this_argument;
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callee_context.arguments.extend(move(arguments_list));
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callee_context.lexical_environment = caller_context.lexical_environment;
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callee_context.variable_environment = caller_context.variable_environment;
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// NOTE: This is a LibJS specific hack for NativeFunction to inherit the strictness of its caller.
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callee_context.is_strict_mode = vm.in_strict_mode();
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if (auto* interpreter = vm.interpreter_if_exists())
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callee_context.current_node = interpreter->current_node();
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// </8.> --------------------------------------------------------------------------
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// 9. Push calleeContext onto the execution context stack; calleeContext is now the running execution context.
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TRY(vm.push_execution_context(callee_context, global_object));
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// 10. Let result be the Completion Record that is the result of evaluating F in a manner that conforms to the specification of F. thisArgument is the this value, argumentsList provides the named parameters, and the NewTarget value is undefined.
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auto result = call();
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// 11. Remove calleeContext from the execution context stack and restore callerContext as the running execution context.
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vm.pop_execution_context();
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// 12. Return result.
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return result;
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}
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// 10.3.2 [[Construct]] ( argumentsList, newTarget ), https://tc39.es/ecma262/#sec-built-in-function-objects-construct-argumentslist-newtarget
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ThrowCompletionOr<Object*> NativeFunction::internal_construct(MarkedValueList arguments_list, FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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// 1. Let callerContext be the running execution context.
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auto& caller_context = vm.running_execution_context();
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// 2. If callerContext is not already suspended, suspend callerContext.
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// NOTE: We don't support this concept yet.
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// 3. Let calleeContext be a new execution context.
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ExecutionContext callee_context(heap());
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// 4. Set the Function of calleeContext to F.
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callee_context.function = this;
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callee_context.function_name = m_name;
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// 5. Let calleeRealm be F.[[Realm]].
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auto* callee_realm = m_realm;
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// NOTE: This non-standard fallback is needed until we can guarantee that literally
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// every function has a realm - especially in LibWeb that's sometimes not the case
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// when a function is created while no JS is running, as we currently need to rely on
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// that (:acid2:, I know - see set_event_handler_attribute() for an example).
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// If there's no 'current realm' either, we can't continue and crash.
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if (!callee_realm)
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callee_realm = vm.current_realm();
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VERIFY(callee_realm);
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// 6. Set the Realm of calleeContext to calleeRealm.
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callee_context.realm = callee_realm;
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// 7. Set the ScriptOrModule of calleeContext to null.
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// Note: This is already the default value.
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// 8. Perform any necessary implementation-defined initialization of calleeContext.
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callee_context.arguments.extend(move(arguments_list));
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callee_context.lexical_environment = caller_context.lexical_environment;
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callee_context.variable_environment = caller_context.variable_environment;
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// NOTE: This is a LibJS specific hack for NativeFunction to inherit the strictness of its caller.
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callee_context.is_strict_mode = vm.in_strict_mode();
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if (auto* interpreter = vm.interpreter_if_exists())
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callee_context.current_node = interpreter->current_node();
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// </8.> --------------------------------------------------------------------------
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// 9. Push calleeContext onto the execution context stack; calleeContext is now the running execution context.
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TRY(vm.push_execution_context(callee_context, global_object));
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// 10. Let result be the Completion Record that is the result of evaluating F in a manner that conforms to the specification of F. The this value is uninitialized, argumentsList provides the named parameters, and newTarget provides the NewTarget value.
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auto result = construct(new_target);
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// 11. Remove calleeContext from the execution context stack and restore callerContext as the running execution context.
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vm.pop_execution_context();
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// 12. Return result.
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return result;
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}
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ThrowCompletionOr<Value> NativeFunction::call()
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{
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return m_native_function(vm(), global_object());
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}
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ThrowCompletionOr<Object*> NativeFunction::construct(FunctionObject&)
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{
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// Needs to be overridden if [[Construct]] is needed.
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VERIFY_NOT_REACHED();
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}
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bool NativeFunction::is_strict_mode() const
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{
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return true;
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}
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}
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