mirror of
https://github.com/LadybirdBrowser/ladybird.git
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226 lines
10 KiB
C++
226 lines
10 KiB
C++
/*
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* Copyright (c) 2020-2025, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Bytecode/Generator.h>
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#include <LibJS/Bytecode/Interpreter.h>
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#include <LibJS/Runtime/ClassFieldDefinition.h>
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#include <LibJS/Runtime/ExecutionContext.h>
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#include <LibJS/Runtime/FunctionObject.h>
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namespace JS {
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template<typename T>
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void async_block_start(VM&, T const& async_body, PromiseCapability const&, ExecutionContext&);
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template<typename T>
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void async_function_start(VM&, PromiseCapability const&, T const& async_function_body);
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enum class ThisMode : u8 {
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Lexical,
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Strict,
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Global,
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};
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enum class ConstructorKind : u8 {
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Base,
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Derived,
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};
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class SharedFunctionInstanceData : public RefCounted<SharedFunctionInstanceData> {
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public:
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SharedFunctionInstanceData(
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VM& vm,
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FunctionKind,
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FlyString name,
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i32 function_length,
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NonnullRefPtr<FunctionParameters const>,
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NonnullRefPtr<Statement const> ecmascript_code,
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ByteString source_text,
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bool strict,
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bool is_arrow_function,
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FunctionParsingInsights const&,
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Vector<FlyString> local_variables_names);
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RefPtr<FunctionParameters const> m_formal_parameters; // [[FormalParameters]]
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RefPtr<Statement const> m_ecmascript_code; // [[ECMAScriptCode]]
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FlyString m_name;
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ByteString m_source_text; // [[SourceText]]
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Vector<FlyString> m_local_variables_names;
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i32 m_function_length { 0 };
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ThisMode m_this_mode : 2 { ThisMode::Global }; // [[ThisMode]]
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FunctionKind m_kind : 3 { FunctionKind::Normal };
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bool m_strict { false };
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bool m_might_need_arguments_object { true };
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bool m_contains_direct_call_to_eval { true };
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bool m_is_arrow_function { false };
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bool m_has_simple_parameter_list { false };
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bool m_is_module_wrapper { false };
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struct VariableNameToInitialize {
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Identifier const& identifier;
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bool parameter_binding { false };
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bool function_name { false };
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};
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bool m_has_parameter_expressions { false };
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bool m_has_duplicates { false };
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enum class ParameterIsLocal {
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No,
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Yes,
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};
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HashMap<FlyString, ParameterIsLocal> m_parameter_names;
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Vector<FunctionDeclaration const&> m_functions_to_initialize;
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bool m_arguments_object_needed { false };
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bool m_function_environment_needed { false };
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bool m_uses_this { false };
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Vector<VariableNameToInitialize> m_var_names_to_initialize_binding;
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Vector<FlyString> m_function_names_to_initialize_binding;
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size_t m_function_environment_bindings_count { 0 };
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size_t m_var_environment_bindings_count { 0 };
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size_t m_lex_environment_bindings_count { 0 };
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Variant<PropertyKey, PrivateName, Empty> m_class_field_initializer_name; // [[ClassFieldInitializerName]]
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ConstructorKind m_constructor_kind : 1 { ConstructorKind::Base }; // [[ConstructorKind]]
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bool m_is_class_constructor : 1 { false }; // [[IsClassConstructor]]
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};
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// 10.2 ECMAScript Function Objects, https://tc39.es/ecma262/#sec-ecmascript-function-objects
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class ECMAScriptFunctionObject final : public FunctionObject {
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JS_OBJECT(ECMAScriptFunctionObject, FunctionObject);
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GC_DECLARE_ALLOCATOR(ECMAScriptFunctionObject);
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public:
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static GC::Ref<ECMAScriptFunctionObject> create(Realm&, FlyString name, ByteString source_text, Statement const& ecmascript_code, NonnullRefPtr<FunctionParameters const> parameters, i32 function_length, Vector<FlyString> local_variables_names, Environment* parent_environment, PrivateEnvironment* private_environment, FunctionKind, bool is_strict, FunctionParsingInsights, bool is_arrow_function = false, Variant<PropertyKey, PrivateName, Empty> class_field_initializer_name = {});
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static GC::Ref<ECMAScriptFunctionObject> create(Realm&, FlyString name, Object& prototype, ByteString source_text, Statement const& ecmascript_code, NonnullRefPtr<FunctionParameters const> parameters, i32 function_length, Vector<FlyString> local_variables_names, Environment* parent_environment, PrivateEnvironment* private_environment, FunctionKind, bool is_strict, FunctionParsingInsights, bool is_arrow_function = false, Variant<PropertyKey, PrivateName, Empty> class_field_initializer_name = {});
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[[nodiscard]] static GC::Ref<ECMAScriptFunctionObject> create_from_function_node(
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FunctionNode const&,
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FlyString name,
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GC::Ref<Realm>,
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GC::Ptr<Environment> parent_environment,
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GC::Ptr<PrivateEnvironment>);
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virtual void initialize(Realm&) override;
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virtual ~ECMAScriptFunctionObject() override = default;
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virtual ThrowCompletionOr<void> get_stack_frame_size(size_t& registers_and_constants_and_locals_slots, size_t& argument_count) override;
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virtual ThrowCompletionOr<Value> internal_call(ExecutionContext&, Value this_argument) override;
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virtual ThrowCompletionOr<GC::Ref<Object>> internal_construct(ReadonlySpan<Value> arguments_list, FunctionObject& new_target) override;
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void make_method(Object& home_object);
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[[nodiscard]] bool is_module_wrapper() const { return shared_data().m_is_module_wrapper; }
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void set_is_module_wrapper(bool b) { const_cast<SharedFunctionInstanceData&>(shared_data()).m_is_module_wrapper = b; }
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Statement const& ecmascript_code() const { return *shared_data().m_ecmascript_code; }
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[[nodiscard]] virtual FunctionParameters const& formal_parameters() const override { return *shared_data().m_formal_parameters; }
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FlyString const& name() const { return shared_data().m_name; }
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void set_name(FlyString const& name);
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void set_is_class_constructor() { const_cast<SharedFunctionInstanceData&>(shared_data()).m_is_class_constructor = true; }
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auto& bytecode_executable() const { return m_bytecode_executable; }
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Environment* environment() { return m_environment; }
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virtual Realm* realm() const override { return &shape().realm(); }
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[[nodiscard]] ConstructorKind constructor_kind() const { return shared_data().m_constructor_kind; }
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void set_constructor_kind(ConstructorKind constructor_kind) { const_cast<SharedFunctionInstanceData&>(shared_data()).m_constructor_kind = constructor_kind; }
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[[nodiscard]] ThisMode this_mode() const { return shared_data().m_this_mode; }
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[[nodiscard]] bool is_arrow_function() const { return shared_data().m_is_arrow_function; }
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[[nodiscard]] bool is_class_constructor() const { return shared_data().m_is_class_constructor; }
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[[nodiscard]] bool uses_this() const { return shared_data().m_uses_this; }
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[[nodiscard]] i32 function_length() const { return shared_data().m_function_length; }
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Object* home_object() const { return m_home_object; }
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void set_home_object(Object* home_object) { m_home_object = home_object; }
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[[nodiscard]] ByteString const& source_text() const { return shared_data().m_source_text; }
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void set_source_text(ByteString source_text) { const_cast<SharedFunctionInstanceData&>(shared_data()).m_source_text = move(source_text); }
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Vector<ClassFieldDefinition> const& fields() const { return ensure_class_data().fields; }
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void add_field(ClassFieldDefinition field) { ensure_class_data().fields.append(move(field)); }
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Vector<PrivateElement> const& private_methods() const { return ensure_class_data().private_methods; }
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void add_private_method(PrivateElement method) { ensure_class_data().private_methods.append(move(method)); }
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[[nodiscard]] bool has_class_data() const { return m_class_data; }
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// This is for IsSimpleParameterList (static semantics)
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bool has_simple_parameter_list() const { return shared_data().m_has_simple_parameter_list; }
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// Equivalent to absence of [[Construct]]
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virtual bool has_constructor() const override { return kind() == FunctionKind::Normal && !shared_data().m_is_arrow_function; }
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virtual Vector<FlyString> const& local_variables_names() const override { return shared_data().m_local_variables_names; }
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FunctionKind kind() const { return shared_data().m_kind; }
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// This is used by LibWeb to disassociate event handler attribute callback functions from the nearest script on the call stack.
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// https://html.spec.whatwg.org/multipage/webappapis.html#getting-the-current-value-of-the-event-handler Step 3.11
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void set_script_or_module(ScriptOrModule script_or_module) { m_script_or_module = move(script_or_module); }
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Variant<PropertyKey, PrivateName, Empty> const& class_field_initializer_name() const { return shared_data().m_class_field_initializer_name; }
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bool allocates_function_environment() const { return shared_data().m_function_environment_needed; }
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friend class Bytecode::Generator;
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private:
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ECMAScriptFunctionObject(
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NonnullRefPtr<SharedFunctionInstanceData>,
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Environment* parent_environment,
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PrivateEnvironment* private_environment,
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Object& prototype);
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virtual bool is_strict_mode() const override { return shared_data().m_strict; }
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Completion ordinary_call_evaluate_body(VM&);
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[[nodiscard]] bool function_environment_needed() const { return shared_data().m_function_environment_needed; }
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SharedFunctionInstanceData const& shared_data() const { return m_shared_data; }
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virtual bool is_ecmascript_function_object() const override { return true; }
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virtual void visit_edges(Visitor&) override;
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ThrowCompletionOr<void> prepare_for_ordinary_call(VM&, ExecutionContext& callee_context, Object* new_target);
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void ordinary_call_bind_this(VM&, ExecutionContext&, Value this_argument);
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NonnullRefPtr<SharedFunctionInstanceData> m_shared_data;
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GC::Ptr<PrimitiveString> m_name_string;
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GC::Ptr<Bytecode::Executable> m_bytecode_executable;
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// Internal Slots of ECMAScript Function Objects, https://tc39.es/ecma262/#table-internal-slots-of-ecmascript-function-objects
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GC::Ptr<Environment> m_environment; // [[Environment]]
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GC::Ptr<PrivateEnvironment> m_private_environment; // [[PrivateEnvironment]]
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ScriptOrModule m_script_or_module; // [[ScriptOrModule]]
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GC::Ptr<Object> m_home_object; // [[HomeObject]]
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struct ClassData {
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Vector<ClassFieldDefinition> fields; // [[Fields]]
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Vector<PrivateElement> private_methods; // [[PrivateMethods]]
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};
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ClassData& ensure_class_data() const;
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mutable OwnPtr<ClassData> m_class_data;
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};
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template<>
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inline bool Object::fast_is<ECMAScriptFunctionObject>() const { return is_ecmascript_function_object(); }
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}
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