From cc164dc1e2441192020ca04f782763ce33893558 Mon Sep 17 00:00:00 2001
From: Andrew Kaster <akaster@serenityos.org>
Date: Fri, 30 Sep 2022 19:01:42 -0600
Subject: [PATCH] Fuzzers: Convert FuzzCSSParser to use the MainThreadVM

Instead of trying to create a Window and a Document, and use those to
create a ParsingContext, just use the JS::Realm only constructor to make
sure that bindings are stashed on the main thread VM's realm.
---
 Meta/Lagom/Fuzzers/FuzzCSSParser.cpp | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/Meta/Lagom/Fuzzers/FuzzCSSParser.cpp b/Meta/Lagom/Fuzzers/FuzzCSSParser.cpp
index 68c81bb512..e31f44a5fe 100644
--- a/Meta/Lagom/Fuzzers/FuzzCSSParser.cpp
+++ b/Meta/Lagom/Fuzzers/FuzzCSSParser.cpp
@@ -4,18 +4,21 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <LibCore/EventLoop.h>
+#include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/CSS/Parser/Parser.h>
-#include <LibWeb/DOM/Document.h>
-#include <LibWeb/HTML/Window.h>
+#include <LibWeb/Platform/EventLoopPluginSerenity.h>
+
+namespace {
+struct Globals {
+    Globals();
+} globals;
+Globals::Globals() { Web::Platform::EventLoopPlugin::install(*new Web::Platform::EventLoopPluginSerenity); }
+}
 
 extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
 {
-    Core::EventLoop loop;
-    auto vm = JS::VM::create();
-    auto realm = JS::Realm::create(*vm);
-    auto window = Web::HTML::Window::create(*realm);
-    auto document = Web::DOM::Document::create(*window);
-    (void)Web::parse_css_stylesheet(Web::CSS::Parser::ParsingContext(document), { data, size });
+    // FIXME: There's got to be a better way to do this "correctly"
+    auto& vm = Web::Bindings::main_thread_vm();
+    (void)Web::parse_css_stylesheet(Web::CSS::Parser::ParsingContext(*vm.current_realm()), { data, size });
     return 0;
 }