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ladybird/Libraries/LibJS/Runtime/ScriptFunction.h

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LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.
*/
#pragma once
LibJS: Add function default arguments Adds the ability for function arguments to have default values. This works for standard functions as well as arrow functions. Default values are not printed in a <function>.toString() call, as nodes cannot print their source string representation.
2020-05-02 11:46:39 -07:00
#include <LibJS/AST.h>
LibJS: Add "Heap" and "Runtime" subdirectories Let's try to keep LibJS tidy as it expands. :^)
2020-03-16 14:20:30 +01:00
#include <LibJS/Runtime/Function.h>
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
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namespace JS {
class ScriptFunction final : public Function {
LibJS+LibWeb: Add JS::Object::inherits(class_name) To allow implementing the DOM class hierarchy in JS bindings, this patch adds an inherits() function that can be used to ask an Object if it inherits from a specific C++ class (by name). The necessary overrides are baked into each Object subclass by the new JS_OBJECT macro, which works similarly to C_OBJECT in LibCore. Thanks to @Dexesttp for suggesting this approach. :^)
2020-06-21 15:14:02 +02:00
JS_OBJECT(ScriptFunction, Function);
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
public:
LibJS: Strict mode is now handled by Functions and Programs, not Blocks Since blocks can't be strict by themselves, it makes no sense for them to store whether or not they are strict. Strict-ness is now stored in the Program and FunctionNode ASTNodes. Fixes issue #3641
2020-10-03 17:02:43 -07:00
static ScriptFunction* create(GlobalObject&, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, LexicalEnvironment* parent_environment, bool is_strict, bool is_arrow_function = false);
LibJS: Pass prototype to Function constructors
2020-04-17 19:59:32 +02:00
LibJS: Strict mode is now handled by Functions and Programs, not Blocks Since blocks can't be strict by themselves, it makes no sense for them to store whether or not they are strict. Strict-ness is now stored in the Program and FunctionNode ASTNodes. Fixes issue #3641
2020-10-03 17:02:43 -07:00
ScriptFunction(GlobalObject&, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, LexicalEnvironment* parent_environment, Object& prototype, bool is_strict, bool is_arrow_function = false);
LibJS: Simplify Cell::initialize() Remove the Interpreter& argument and pass only GlobalObject&. We can find everything we need via the global object anyway.
2020-07-22 17:50:18 +02:00
virtual void initialize(GlobalObject&) override;
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
virtual ~ScriptFunction();
AK: Stop allowing implicit downcast with RefPtr and NonnullRefPtr We were allowing this dangerous kind of thing: RefPtr<Base> base; RefPtr<Derived> derived = base; This patch changes the {Nonnull,}RefPtr constructors so this is no longer possible. To downcast one of these pointers, there is now static_ptr_cast<T>: RefPtr<Derived> derived = static_ptr_cast<Derived>(base); Fixing this exposed a ton of cowboy-downcasts in various places, which we're now forced to fix. :^)
2020-04-05 11:11:07 +02:00
const Statement& body() const { return m_body; }
LibJS: Add function default arguments Adds the ability for function arguments to have default values. This works for standard functions as well as arrow functions. Default values are not printed in a <function>.toString() call, as nodes cannot print their source string representation.
2020-05-02 11:46:39 -07:00
const Vector<FunctionNode::Parameter>& parameters() const { return m_parameters; };
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
LibJS: Make Function::call() not require an Interpreter& This makes a difference inside ScriptFunction::call(), which will now instantiate a temporary Interpreter if one is not attached to the VM.
2020-09-27 17:24:14 +02:00
virtual Value call() override;
LibJS: Remove Interpreter& argument to Function::construct() This is no longer needed, we can get everything we need from the VM.
2020-09-27 18:45:21 +02:00
virtual Value construct(Function& new_target) override;
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
LibJS: Make Function and CallFrame aware of their function name
2020-04-11 12:56:20 +01:00
virtual const FlyString& name() const override { return m_name; };
LibJS: Set name of anonymous functions during assignment
2020-05-02 20:28:48 +01:00
void set_name(const FlyString& name) { m_name = name; };
LibJS: Make Function and CallFrame aware of their function name
2020-04-11 12:56:20 +01:00
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
private:
LibJS: Fix casting a value to ScriptFunction without checking it's one
2020-06-01 16:58:54 +03:00
virtual bool is_script_function() const override { return true; }
LibJS: Introduce LexicalEnvironment This patch replaces the old variable lookup logic with a new one based on lexical environments. This brings us closer to the way JavaScript is actually specced, and also gives us some basic support for closures. The interpreter's call stack frames now have a pointer to the lexical environment for that frame. Each lexical environment can have a chain of parent environments. Before calling a Function, we first ask it to create_environment(). This gives us a new LexicalEnvironment for that function, which has the function's lexical parent's environment as its parent. This allows inner functions to access variables in their outer function: function foo() { <-- LexicalEnvironment A var x = 1; function() { <-- LexicalEnvironment B (parent: A) console.log(x); } } If we return the result of a function expression from a function, that new function object will keep a reference to its parent environment, which is how we get closures. :^) I'm pretty sure I didn't get everything right here, but it's a pretty good start. This is quite a bit slower than before, but also correcter!
2020-04-15 21:58:22 +02:00
virtual LexicalEnvironment* create_environment() override;
virtual void visit_children(Visitor&) override;
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
LibJS: Pass GlobalObject& to native functions and property accessors More work towards supporting multiple global objects. Native C++ code now get a GlobalObject& and don't have to ask the Interpreter for it. I've added macros for declaring and defining native callbacks since this was pretty tedious and this makes it easier next time we want to change any of these signatures.
2020-06-20 13:55:34 +02:00
JS_DECLARE_NATIVE_GETTER(length_getter);
JS_DECLARE_NATIVE_GETTER(name_getter);
LibJS: Add length property to ScriptFunction
2020-04-04 14:34:27 +01:00
LibJS: Make Function and CallFrame aware of their function name
2020-04-11 12:56:20 +01:00
FlyString m_name;
AK: Stop allowing implicit downcast with RefPtr and NonnullRefPtr We were allowing this dangerous kind of thing: RefPtr<Base> base; RefPtr<Derived> derived = base; This patch changes the {Nonnull,}RefPtr constructors so this is no longer possible. To downcast one of these pointers, there is now static_ptr_cast<T>: RefPtr<Derived> derived = static_ptr_cast<Derived>(base); Fixing this exposed a ton of cowboy-downcasts in various places, which we're now forced to fix. :^)
2020-04-05 11:11:07 +02:00
NonnullRefPtr<Statement> m_body;
LibJS: Add function default arguments Adds the ability for function arguments to have default values. This works for standard functions as well as arrow functions. Default values are not printed in a <function>.toString() call, as nodes cannot print their source string representation.
2020-05-02 11:46:39 -07:00
const Vector<FunctionNode::Parameter> m_parameters;
LibJS: Introduce LexicalEnvironment This patch replaces the old variable lookup logic with a new one based on lexical environments. This brings us closer to the way JavaScript is actually specced, and also gives us some basic support for closures. The interpreter's call stack frames now have a pointer to the lexical environment for that frame. Each lexical environment can have a chain of parent environments. Before calling a Function, we first ask it to create_environment(). This gives us a new LexicalEnvironment for that function, which has the function's lexical parent's environment as its parent. This allows inner functions to access variables in their outer function: function foo() { <-- LexicalEnvironment A var x = 1; function() { <-- LexicalEnvironment B (parent: A) console.log(x); } } If we return the result of a function expression from a function, that new function object will keep a reference to its parent environment, which is how we get closures. :^) I'm pretty sure I didn't get everything right here, but it's a pretty good start. This is quite a bit slower than before, but also correcter!
2020-04-15 21:58:22 +02:00
LexicalEnvironment* m_parent_environment { nullptr };
LibJS: Function.length respects default and rest parameters "[Function.length is] the number of formal parameters. This number excludes the rest parameter and only includes parameters before the first one with a default value." - MDN
2020-05-05 20:02:14 -07:00
i32 m_function_length;
LibJS: Strict mode is now handled by Functions and Programs, not Blocks Since blocks can't be strict by themselves, it makes no sense for them to store whether or not they are strict. Strict-ness is now stored in the Program and FunctionNode ASTNodes. Fixes issue #3641
2020-10-03 17:02:43 -07:00
bool m_is_strict;
LibJS: Track whether ScriptFunctions and FunctionExpressions are arrow functions
2020-05-30 00:10:42 -05:00
bool m_is_arrow_function;
LibJS: Split Function into subclasses NativeFunction and ScriptFunction Both types of functions are now Function and implement calling via: virtual Value call(Interpreter&, Vector<Value> arguments); This removes the need for CallExpression::execute() to care about which kind of function it's calling. :^)
2020-03-13 10:08:52 +01:00
};
}
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