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ladybird/Libraries/LibJS/Runtime/GlobalObject.cpp
Andreas Kling ec55490198 LibJS: Make global objects have unique shape from the start 
There's no point in trying to achieve shape sharing for global objects,
so we can simply make the shape unique from the start and avoid making
a transition chain.
2020-10-04 22:56:45 +02:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* 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.
*/
#include <AK/LogStream.h>
#include <LibJS/Console.h>
#include <LibJS/Heap/DeferGC.h>
#include <LibJS/Runtime/ArrayConstructor.h>
#include <LibJS/Runtime/ArrayIteratorPrototype.h>
#include <LibJS/Runtime/ArrayPrototype.h>
#include <LibJS/Runtime/BigIntConstructor.h>
#include <LibJS/Runtime/BigIntPrototype.h>
#include <LibJS/Runtime/BooleanConstructor.h>
#include <LibJS/Runtime/BooleanPrototype.h>
#include <LibJS/Runtime/ConsoleObject.h>
#include <LibJS/Runtime/DateConstructor.h>
#include <LibJS/Runtime/DatePrototype.h>
#include <LibJS/Runtime/ErrorConstructor.h>
#include <LibJS/Runtime/ErrorPrototype.h>
#include <LibJS/Runtime/FunctionConstructor.h>
#include <LibJS/Runtime/FunctionPrototype.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorPrototype.h>
#include <LibJS/Runtime/JSONObject.h>
#include <LibJS/Runtime/MathObject.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/NumberConstructor.h>
#include <LibJS/Runtime/NumberPrototype.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/ObjectConstructor.h>
#include <LibJS/Runtime/ObjectPrototype.h>
#include <LibJS/Runtime/ProxyConstructor.h>
#include <LibJS/Runtime/ProxyPrototype.h>
#include <LibJS/Runtime/ReflectObject.h>
#include <LibJS/Runtime/RegExpConstructor.h>
#include <LibJS/Runtime/RegExpPrototype.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/StringConstructor.h>
#include <LibJS/Runtime/StringIteratorPrototype.h>
#include <LibJS/Runtime/StringPrototype.h>
#include <LibJS/Runtime/SymbolConstructor.h>
#include <LibJS/Runtime/SymbolPrototype.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
GlobalObject::GlobalObject()
: Object(GlobalObjectTag::Tag)
, m_console(make<Console>(*this))
{
}
void GlobalObject::initialize()
{
ensure_shape_is_unique();
// These are done first since other prototypes depend on their presence.
m_empty_object_shape = heap().allocate<Shape>(*this, *this);
m_object_prototype = heap().allocate_without_global_object<ObjectPrototype>(*this);
m_function_prototype = heap().allocate_without_global_object<FunctionPrototype>(*this);
static_cast<FunctionPrototype*>(m_function_prototype)->initialize(*this);
static_cast<ObjectPrototype*>(m_object_prototype)->initialize(*this);
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
if (!m_##snake_name##_prototype) \
m_##snake_name##_prototype = heap().allocate<PrototypeName>(*this, *this);
JS_ENUMERATE_BUILTIN_TYPES
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name) \
if (!m_##snake_name##_prototype) \
m_##snake_name##_prototype = heap().allocate<ClassName##Prototype>(*this, *this);
JS_ENUMERATE_ITERATOR_PROTOTYPES
#undef __JS_ENUMERATE
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function("gc", gc, 0, attr);
define_native_function("isNaN", is_nan, 1, attr);
define_native_function("isFinite", is_finite, 1, attr);
define_native_function("parseFloat", parse_float, 1, attr);
define_property("NaN", js_nan(), 0);
define_property("Infinity", js_infinity(), 0);
define_property("undefined", js_undefined(), 0);
define_property("globalThis", this, attr);
define_property("console", heap().allocate<ConsoleObject>(*this, *this), attr);
define_property("Math", heap().allocate<MathObject>(*this, *this), attr);
define_property("JSON", heap().allocate<JSONObject>(*this, *this), attr);
define_property("Reflect", heap().allocate<ReflectObject>(*this, *this), attr);
add_constructor("Array", m_array_constructor, *m_array_prototype);
add_constructor("BigInt", m_bigint_constructor, *m_bigint_prototype);
add_constructor("Boolean", m_boolean_constructor, *m_boolean_prototype);
add_constructor("Date", m_date_constructor, *m_date_prototype);
add_constructor("Error", m_error_constructor, *m_error_prototype);
add_constructor("Function", m_function_constructor, *m_function_prototype);
add_constructor("Number", m_number_constructor, *m_number_prototype);
add_constructor("Object", m_object_constructor, *m_object_prototype);
add_constructor("Proxy", m_proxy_constructor, *m_proxy_prototype);
add_constructor("RegExp", m_regexp_constructor, *m_regexp_prototype);
add_constructor("String", m_string_constructor, *m_string_prototype);
add_constructor("Symbol", m_symbol_constructor, *m_symbol_prototype);
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
add_constructor(#ClassName, m_##snake_name##_constructor, *m_##snake_name##_prototype);
JS_ENUMERATE_ERROR_SUBCLASSES
#undef __JS_ENUMERATE
}
GlobalObject::~GlobalObject()
{
}
void GlobalObject::visit_children(Visitor& visitor)
{
Object::visit_children(visitor);
visitor.visit(m_empty_object_shape);
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
visitor.visit(m_##snake_name##_constructor);
JS_ENUMERATE_ERROR_SUBCLASSES
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name) \
visitor.visit(m_##snake_name##_prototype);
JS_ENUMERATE_ITERATOR_PROTOTYPES
#undef __JS_ENUMERATE
}
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::gc)
{
dbg() << "Forced garbage collection requested!";
vm.heap().collect_garbage();
return js_undefined();
}
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::is_nan)
{
auto number = vm.argument(0).to_number(global_object);
if (vm.exception())
return {};
return Value(number.is_nan());
}
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::is_finite)
{
auto number = vm.argument(0).to_number(global_object);
if (vm.exception())
return {};
return Value(number.is_finite_number());
}
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::parse_float)
{
if (vm.argument(0).is_number())
return vm.argument(0);
auto string = vm.argument(0).to_string(global_object);
if (vm.exception())
return {};
for (size_t length = string.length(); length > 0; --length) {
// This can't throw, so no exception check is fine.
auto number = Value(js_string(vm, string.substring(0, length))).to_number(global_object);
if (!number.is_nan())
return number;
}
return js_nan();
}
}
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