LibWeb+LibWasm: Implement the WebAssembly.Table object

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTableConstructor.cpp

@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/TypedArray.h>
+#include <LibWeb/Bindings/WindowObject.h>
+#include <LibWeb/WebAssembly/WebAssemblyObject.h>
+#include <LibWeb/WebAssembly/WebAssemblyTableConstructor.h>
+#include <LibWeb/WebAssembly/WebAssemblyTableObject.h>
+#include <LibWeb/WebAssembly/WebAssemblyTablePrototype.h>
+
+namespace Web::Bindings {
+
+WebAssemblyTableConstructor::WebAssemblyTableConstructor(JS::GlobalObject& global_object)
+    : NativeFunction(*global_object.function_prototype())
+{
+}
+
+WebAssemblyTableConstructor::~WebAssemblyTableConstructor()
+{
+}
+
+JS::Value WebAssemblyTableConstructor::call()
+{
+    vm().throw_exception<JS::TypeError>(global_object(), JS::ErrorType::ConstructorWithoutNew, "WebAssembly.Table");
+    return {};
+}
+
+JS::Value WebAssemblyTableConstructor::construct(FunctionObject&)
+{
+    auto& vm = this->vm();
+    auto& global_object = this->global_object();
+
+    auto descriptor = vm.argument(0).to_object(global_object);
+    if (vm.exception())
+        return {};
+
+    auto element_value = descriptor->get("element");
+    if (vm.exception())
+        return {};
+    if (!element_value.is_string()) {
+        vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::InvalidHint, element_value.to_string_without_side_effects());
+        return {};
+    }
+    auto& element = element_value.as_string().string();
+
+    Optional<Wasm::ValueType> reference_type;
+    if (element == "anyfunc"sv)
+        reference_type = Wasm::ValueType(Wasm::ValueType::FunctionReference);
+    else if (element == "externref"sv)
+        reference_type = Wasm::ValueType(Wasm::ValueType::ExternReference);
+
+    if (!reference_type.has_value()) {
+        vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::InvalidHint, element);
+        return {};
+    }
+
+    auto initial_value = descriptor->get("initial");
+    if (vm.exception())
+        return {};
+    auto maximum_value = descriptor->get("maximum");
+    if (vm.exception())
+        return {};
+
+    auto initial = initial_value.to_u32(global_object);
+    if (vm.exception())
+        return {};
+
+    Optional<u32> maximum;
+
+    if (!maximum_value.is_undefined()) {
+        maximum = maximum_value.to_u32(global_object);
+        if (vm.exception())
+            return {};
+    }
+
+    if (maximum.has_value() && maximum.value() < initial) {
+        vm.throw_exception<JS::RangeError>(global_object, "maximum should be larger than or equal to initial");
+        return {};
+    }
+
+    auto value_value = descriptor->get("value");
+    if (vm.exception())
+        return {};
+
+    auto reference_value = [&]() -> Optional<Wasm::Value> {
+        if (value_value.is_empty() || value_value.is_undefined())
+            return Wasm::Value(*reference_type, 0ull);
+
+        return to_webassembly_value(value_value, *reference_type, global_object);
+    }();
+
+    if (!reference_value.has_value())
+        return {};
+
+    auto& reference = reference_value->value().get<Wasm::Reference>();
+
+    auto address = WebAssemblyObject::s_abstract_machine.store().allocate(Wasm::TableType { *reference_type, Wasm::Limits { initial, maximum } });
+    if (!address.has_value()) {
+        vm.throw_exception<JS::TypeError>(global_object, "Wasm Table allocation failed");
+        return {};
+    }
+
+    auto& table = *WebAssemblyObject::s_abstract_machine.store().get(*address);
+    for (auto& element : table.elements())
+        element = reference;
+
+    return vm.heap().allocate<WebAssemblyTableObject>(global_object, global_object, *address);
+}
+
+void WebAssemblyTableConstructor::initialize(JS::GlobalObject& global_object)
+{
+    auto& vm = this->vm();
+    auto& window = static_cast<WindowObject&>(global_object);
+
+    NativeFunction::initialize(global_object);
+    define_direct_property(vm.names.prototype, &window.ensure_web_prototype<WebAssemblyTablePrototype>("WebAssemblyTablePrototype"), 0);
+    define_direct_property(vm.names.length, JS::Value(1), JS::Attribute::Configurable);
+}
+
+}