LibJS: Remove ProxyPrototype

Proxy is an "exotic object" and doesn't have its own prototype. Use the
regular object prototype instead, but most stuff is happening on the
target object anyway. :^)

9 files changed, 33 insertions, 110 deletions

diff --git a/Libraries/LibJS/CMakeLists.txt b/Libraries/LibJS/CMakeLists.txt
index 90b336df9d..6517907288 100644
--- a/Libraries/LibJS/CMakeLists.txt
+++ b/Libraries/LibJS/CMakeLists.txt
@@ -55,7 +55,6 @@ set(SOURCES
     Runtime/PropertyAttributes.cpp
     Runtime/ProxyConstructor.cpp
     Runtime/ProxyObject.cpp
-    Runtime/ProxyPrototype.cpp
     Runtime/Reference.cpp
     Runtime/ReflectObject.cpp
     Runtime/RegExpConstructor.cpp
diff --git a/Libraries/LibJS/Forward.h b/Libraries/LibJS/Forward.h
index 57cf1e33dc..a6f482f825 100644
--- a/Libraries/LibJS/Forward.h
+++ b/Libraries/LibJS/Forward.h
@@ -44,6 +44,7 @@
 #define JS_DEFINE_NATIVE_SETTER(name) \
     void name([[maybe_unused]] JS::VM& vm, [[maybe_unused]] JS::GlobalObject& global_object, JS::Value value)
 
+// NOTE: Proxy is not included here as it doesn't have a prototype - m_proxy_constructor is initialized separately.
 #define JS_ENUMERATE_NATIVE_OBJECTS                                              \
     __JS_ENUMERATE(Array, array, ArrayPrototype, ArrayConstructor)               \
     __JS_ENUMERATE(BigIntObject, bigint, BigIntPrototype, BigIntConstructor)     \
@@ -53,7 +54,6 @@
     __JS_ENUMERATE(Function, function, FunctionPrototype, FunctionConstructor)   \
     __JS_ENUMERATE(NumberObject, number, NumberPrototype, NumberConstructor)     \
     __JS_ENUMERATE(Object, object, ObjectPrototype, ObjectConstructor)           \
-    __JS_ENUMERATE(ProxyObject, proxy, ProxyPrototype, ProxyConstructor)         \
     __JS_ENUMERATE(RegExpObject, regexp, RegExpPrototype, RegExpConstructor)     \
     __JS_ENUMERATE(StringObject, string, StringPrototype, StringConstructor)     \
     __JS_ENUMERATE(SymbolObject, symbol, SymbolPrototype, SymbolConstructor)
@@ -134,6 +134,10 @@ class VM;
 class Value;
 enum class DeclarationKind;
 
+// Not included in JS_ENUMERATE_NATIVE_OBJECTS due to missing distinct prototype
+class ProxyObject;
+class ProxyConstructor;
+
 #define __JS_ENUMERATE(ClassName, snake_name, ConstructorName, PrototypeName) \
     class ClassName;                                                          \
     class ConstructorName;                                                    \
diff --git a/Libraries/LibJS/Runtime/GlobalObject.cpp b/Libraries/LibJS/Runtime/GlobalObject.cpp
index d878996b44..7d8b0992df 100644
--- a/Libraries/LibJS/Runtime/GlobalObject.cpp
+++ b/Libraries/LibJS/Runtime/GlobalObject.cpp
@@ -53,7 +53,6 @@
 #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>
@@ -124,21 +123,21 @@ void GlobalObject::initialize()
     define_property(vm.names.JSON, heap().allocate<JSONObject>(*this, *this), attr);
     define_property(vm.names.Reflect, heap().allocate<ReflectObject>(*this, *this), attr);
 
-    add_constructor(vm.names.Array, m_array_constructor, *m_array_prototype);
-    add_constructor(vm.names.BigInt, m_bigint_constructor, *m_bigint_prototype);
-    add_constructor(vm.names.Boolean, m_boolean_constructor, *m_boolean_prototype);
-    add_constructor(vm.names.Date, m_date_constructor, *m_date_prototype);
-    add_constructor(vm.names.Error, m_error_constructor, *m_error_prototype);
-    add_constructor(vm.names.Function, m_function_constructor, *m_function_prototype);
-    add_constructor(vm.names.Number, m_number_constructor, *m_number_prototype);
-    add_constructor(vm.names.Object, m_object_constructor, *m_object_prototype);
-    add_constructor(vm.names.Proxy, m_proxy_constructor, *m_proxy_prototype);
-    add_constructor(vm.names.RegExp, m_regexp_constructor, *m_regexp_prototype);
-    add_constructor(vm.names.String, m_string_constructor, *m_string_prototype);
-    add_constructor(vm.names.Symbol, m_symbol_constructor, *m_symbol_prototype);
+    add_constructor(vm.names.Array, m_array_constructor, m_array_prototype);
+    add_constructor(vm.names.BigInt, m_bigint_constructor, m_bigint_prototype);
+    add_constructor(vm.names.Boolean, m_boolean_constructor, m_boolean_prototype);
+    add_constructor(vm.names.Date, m_date_constructor, m_date_prototype);
+    add_constructor(vm.names.Error, m_error_constructor, m_error_prototype);
+    add_constructor(vm.names.Function, m_function_constructor, m_function_prototype);
+    add_constructor(vm.names.Number, m_number_constructor, m_number_prototype);
+    add_constructor(vm.names.Object, m_object_constructor, m_object_prototype);
+    add_constructor(vm.names.Proxy, m_proxy_constructor, nullptr);
+    add_constructor(vm.names.RegExp, m_regexp_constructor, m_regexp_prototype);
+    add_constructor(vm.names.String, m_string_constructor, m_string_prototype);
+    add_constructor(vm.names.Symbol, m_symbol_constructor, m_symbol_prototype);
 
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
-    add_constructor(vm.names.ClassName, m_##snake_name##_constructor, *m_##snake_name##_prototype);
+    add_constructor(vm.names.ClassName, m_##snake_name##_constructor, m_##snake_name##_prototype);
     JS_ENUMERATE_ERROR_SUBCLASSES
 #undef __JS_ENUMERATE
 }
diff --git a/Libraries/LibJS/Runtime/GlobalObject.h b/Libraries/LibJS/Runtime/GlobalObject.h
index b0d8214478..6ac0eaaa47 100644
--- a/Libraries/LibJS/Runtime/GlobalObject.h
+++ b/Libraries/LibJS/Runtime/GlobalObject.h
@@ -53,6 +53,9 @@ public:
     Shape* new_object_shape() { return m_new_object_shape; }
     Shape* new_script_function_prototype_object_shape() { return m_new_script_function_prototype_object_shape; }
 
+    // Not included in JS_ENUMERATE_NATIVE_OBJECTS due to missing distinct prototype
+    ProxyConstructor* proxy_constructor() { return m_proxy_constructor; }
+
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName)            \
     ConstructorName* snake_name##_constructor() { return m_##snake_name##_constructor; } \
     Object* snake_name##_prototype() { return m_##snake_name##_prototype; }
@@ -68,7 +71,7 @@ protected:
     virtual void visit_edges(Visitor&) override;
 
     template<typename ConstructorType>
-    void add_constructor(const FlyString& property_name, ConstructorType*&, Object& prototype);
+    void add_constructor(const FlyString& property_name, ConstructorType*&, Object* prototype);
 
 private:
     virtual bool is_global_object() const final { return true; }
@@ -84,6 +87,9 @@ private:
     Shape* m_new_object_shape { nullptr };
     Shape* m_new_script_function_prototype_object_shape { nullptr };
 
+    // Not included in JS_ENUMERATE_NATIVE_OBJECTS due to missing distinct prototype
+    ProxyConstructor* m_proxy_constructor { nullptr };
+
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
     ConstructorName* m_##snake_name##_constructor { nullptr };                \
     Object* m_##snake_name##_prototype { nullptr };
@@ -97,16 +103,18 @@ private:
 };
 
 template<typename ConstructorType>
-inline void GlobalObject::add_constructor(const FlyString& property_name, ConstructorType*& constructor, Object& prototype)
+inline void GlobalObject::add_constructor(const FlyString& property_name, ConstructorType*& constructor, Object* prototype)
 {
     auto& vm = this->vm();
     constructor = heap().allocate<ConstructorType>(*this, *this);
     constructor->define_property(vm.names.name, js_string(heap(), property_name), Attribute::Configurable);
     if (vm.exception())
         return;
-    prototype.define_property(vm.names.constructor, constructor, Attribute::Writable | Attribute::Configurable);
-    if (vm.exception())
-        return;
+    if (prototype) {
+        prototype->define_property(vm.names.constructor, constructor, Attribute::Writable | Attribute::Configurable);
+        if (vm.exception())
+            return;
+    }
     define_property(property_name, constructor, Attribute::Writable | Attribute::Configurable);
 }
 
diff --git a/Libraries/LibJS/Runtime/ProxyConstructor.cpp b/Libraries/LibJS/Runtime/ProxyConstructor.cpp
index 747b74a852..53515ccbe1 100644
--- a/Libraries/LibJS/Runtime/ProxyConstructor.cpp
+++ b/Libraries/LibJS/Runtime/ProxyConstructor.cpp
@@ -41,7 +41,6 @@ void ProxyConstructor::initialize(GlobalObject& global_object)
 {
     auto& vm = this->vm();
     NativeFunction::initialize(global_object);
-    define_property(vm.names.prototype, global_object.proxy_prototype(), 0);
     define_property(vm.names.length, Value(2), Attribute::Configurable);
 }
 
diff --git a/Libraries/LibJS/Runtime/ProxyObject.cpp b/Libraries/LibJS/Runtime/ProxyObject.cpp
index 12f9a99202..85a0d9db1b 100644
--- a/Libraries/LibJS/Runtime/ProxyObject.cpp
+++ b/Libraries/LibJS/Runtime/ProxyObject.cpp
@@ -59,7 +59,7 @@ bool static is_compatible_property_descriptor(bool is_extensible, PropertyDescri
 
 ProxyObject* ProxyObject::create(GlobalObject& global_object, Object& target, Object& handler)
 {
-    return global_object.heap().allocate<ProxyObject>(global_object, target, handler, *global_object.proxy_prototype());
+    return global_object.heap().allocate<ProxyObject>(global_object, target, handler, *global_object.object_prototype());
 }
 
 ProxyObject::ProxyObject(Object& target, Object& handler, Object& prototype)
diff --git a/Libraries/LibJS/Runtime/ProxyPrototype.cpp b/Libraries/LibJS/Runtime/ProxyPrototype.cpp
deleted file mode 100644
index ce44b0e364..0000000000
--- a/Libraries/LibJS/Runtime/ProxyPrototype.cpp
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
- * 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/Function.h>
-#include <AK/StringBuilder.h>
-#include <LibJS/Heap/Heap.h>
-#include <LibJS/Runtime/Error.h>
-#include <LibJS/Runtime/GlobalObject.h>
-#include <LibJS/Runtime/ProxyPrototype.h>
-
-namespace JS {
-
-ProxyPrototype::ProxyPrototype(GlobalObject& global_object)
-    : Object(*global_object.object_prototype())
-{
-}
-
-ProxyPrototype::~ProxyPrototype()
-{
-}
-
-}
diff --git a/Libraries/LibJS/Runtime/ProxyPrototype.h b/Libraries/LibJS/Runtime/ProxyPrototype.h
deleted file mode 100644
index b680f6dacb..0000000000
--- a/Libraries/LibJS/Runtime/ProxyPrototype.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
- * 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
-
-#include <LibJS/Runtime/Object.h>
-
-namespace JS {
-
-class ProxyPrototype final : public Object {
-    JS_OBJECT(ProxyPrototype, Object);
-
-public:
-    explicit ProxyPrototype(GlobalObject&);
-    virtual ~ProxyPrototype() override;
-};
-
-}
diff --git a/Libraries/LibWeb/Bindings/WindowObject.cpp b/Libraries/LibWeb/Bindings/WindowObject.cpp
index 7d271f00e5..ec740dfa79 100644
--- a/Libraries/LibWeb/Bindings/WindowObject.cpp
+++ b/Libraries/LibWeb/Bindings/WindowObject.cpp
@@ -87,7 +87,7 @@ void WindowObject::initialize()
     m_xhr_prototype = heap().allocate<XMLHttpRequestPrototype>(*this, *this);
     m_xhr_constructor = heap().allocate<XMLHttpRequestConstructor>(*this, *this);
     m_xhr_constructor->define_property("prototype", m_xhr_prototype, 0);
-    add_constructor("XMLHttpRequest", m_xhr_constructor, *m_xhr_prototype);
+    add_constructor("XMLHttpRequest", m_xhr_constructor, m_xhr_prototype);
 }
 
 WindowObject::~WindowObject()