LibWeb: Add the WebAssembly.Instance constructor

1 files changed, 65 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceConstructor.cpp b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceConstructor.cpp
new file mode 100644
index 0000000000..5dafdd35ac
--- /dev/null
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceConstructor.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibWeb/Bindings/WindowObject.h>
+#include <LibWeb/WebAssembly/WebAssemblyInstanceConstructor.h>
+#include <LibWeb/WebAssembly/WebAssemblyInstanceObject.h>
+#include <LibWeb/WebAssembly/WebAssemblyInstanceObjectPrototype.h>
+#include <LibWeb/WebAssembly/WebAssemblyObject.h>
+
+namespace Web::Bindings {
+
+WebAssemblyInstanceConstructor::WebAssemblyInstanceConstructor(JS::GlobalObject& global_object)
+    : NativeFunction(*global_object.function_prototype())
+{
+}
+
+WebAssemblyInstanceConstructor::~WebAssemblyInstanceConstructor()
+{
+}
+
+JS::Value WebAssemblyInstanceConstructor::call()
+{
+    vm().throw_exception<JS::TypeError>(global_object(), JS::ErrorType::ConstructorWithoutNew, "WebAssemblyInstance");
+    return {};
+}
+
+JS::Value WebAssemblyInstanceConstructor::construct(FunctionObject&)
+{
+    auto& vm = this->vm();
+    auto& global_object = this->global_object();
+
+    auto module_argument = vm.argument(0).to_object(global_object);
+    if (vm.exception())
+        return {};
+
+    if (!is<WebAssemblyModuleObject>(module_argument)) {
+        vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotA, "WebAssembly.Module");
+        return {};
+    }
+
+    auto& module_object = static_cast<WebAssemblyModuleObject&>(*module_argument);
+    auto result = WebAssemblyObject::instantiate_module(module_object.module(), vm, global_object);
+    if (result.is_error()) {
+        vm.throw_exception(global_object, result.release_error());
+        return {};
+    }
+    return heap().allocate<WebAssemblyInstanceObject>(global_object, global_object, result.value());
+}
+
+void WebAssemblyInstanceConstructor::initialize(JS::GlobalObject& global_object)
+{
+    auto& vm = this->vm();
+    auto& window = static_cast<WindowObject&>(global_object);
+
+    NativeFunction::initialize(global_object);
+    define_property(vm.names.prototype, &window.ensure_web_prototype<WebAssemblyInstancePrototype>("WebAssemblyInstancePrototype"));
+    define_property(vm.names.length, JS::Value(1), JS::Attribute::Configurable);
+}
+
+}