[Android WebView] Terminate execution of stuck JS code on navigation requests

android_webview/renderer/aw_execution_termination_filter.cc

Index: android_webview/renderer/aw_execution_termination_filter.cc
diff --git a/android_webview/renderer/aw_execution_termination_filter.cc b/android_webview/renderer/aw_execution_termination_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..75f130dbcb07e71cfad1f4c0564202034af53e87
--- /dev/null
+++ b/android_webview/renderer/aw_execution_termination_filter.cc
@@ -0,0 +1,76 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "android_webview/renderer/aw_execution_termination_filter.h"
+
+#include <v8.h>
+
+#include "android_webview/common/render_view_messages.h"
+#include "base/message_loop/message_loop_proxy.h"
+
+namespace {
+const int kTerminationTimeoutInSeconds = 3;
+}  // namespace
+
+namespace android_webview {
+
+AwExecutionTerminationFilter::AwExecutionTerminationFilter(
+    const scoped_refptr<base::MessageLoopProxy>& io_message_loop,
+    const scoped_refptr<base::MessageLoopProxy>& main_message_loop)
+    : io_message_loop_(io_message_loop),
+      main_message_loop_(main_message_loop),
+      render_thread_isolate_(NULL) {
+}
+
+AwExecutionTerminationFilter::~AwExecutionTerminationFilter() {
+}
+
+void AwExecutionTerminationFilter::SetRenderThreadIsolate(
+    v8::Isolate* isolate) {
+  render_thread_isolate_ = isolate;
+}
+
+bool AwExecutionTerminationFilter::OnMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(AwExecutionTerminationFilter, message)
+    IPC_MESSAGE_HANDLER(AwViewMsg_CheckRenderThreadResponsiveness,
+                        OnCheckRenderThreadResponsiveness)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void AwExecutionTerminationFilter::OnCheckRenderThreadResponsiveness() {
+  termination_timer_.Start(
+      FROM_HERE,
+      base::TimeDelta::FromSeconds(kTerminationTimeoutInSeconds),
+      base::Bind(&AwExecutionTerminationFilter::TerminateExecution, this));
+  // Post a request to stop the timer via render thread's message loop
+  // to ensure that render thread is responsive.
+  main_message_loop_->PostTask(
+      FROM_HERE,
+      base::Bind(&AwExecutionTerminationFilter::StopTimerOnMainThread,
+                 this));
+}
+
+void AwExecutionTerminationFilter::StopTimerOnMainThread() {
+  io_message_loop_->PostTask(
+      FROM_HERE,
+      base::Bind(&AwExecutionTerminationFilter::StopTimer, this));
+}
+
+void AwExecutionTerminationFilter::StopTimer() {
+  termination_timer_.Stop();
+}
+
+void AwExecutionTerminationFilter::TerminateExecution() {
+  if (render_thread_isolate_) {
+    LOG(WARNING) << "Trying to terminate JavaScript execution because "
+        "renderer is unresponsive";
+    v8::V8::TerminateExecution(render_thread_isolate_);
+  }
+}
+
+}  // namespace android_webview