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/*
* Copyright (C) 2010 Google, Inc. 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 APPLE INC. ``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 APPLE INC. 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_RUNNER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_RUNNER_H_
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_state_observer.h"
#include "third_party/blink/renderer/platform/bindings/name_client.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/deque.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
namespace blink {
class Document;
class PendingScript;
class ScriptLoader;
class CORE_EXPORT ScriptRunner final
: public GarbageCollected<ScriptRunner>,
public ExecutionContextLifecycleStateObserver,
public NameClient {
public:
explicit ScriptRunner(Document*);
ScriptRunner(const ScriptRunner&) = delete;
ScriptRunner& operator=(const ScriptRunner&) = delete;
void QueueScriptForExecution(PendingScript*);
bool HasPendingScripts() const {
return !pending_in_order_scripts_.IsEmpty() ||
!pending_async_scripts_.IsEmpty();
}
void SetForceDeferredExecution(bool force_deferred);
void NotifyScriptReady(PendingScript*);
void NotifyDelayedAsyncScriptsMilestoneReached();
void ContextLifecycleStateChanged(mojom::FrameLifecycleState) final;
void ContextDestroyed() final {}
static void MovePendingScript(Document&, Document&, ScriptLoader*);
void SetTaskRunnerForTesting(base::SingleThreadTaskRunner* task_runner) {
task_runner_ = task_runner;
}
void Trace(Visitor*) const override;
const char* NameInHeapSnapshot() const override { return "ScriptRunner"; }
private:
class Task;
void MovePendingScript(ScriptRunner*, PendingScript*);
bool RemovePendingInOrderScript(PendingScript*);
void ScheduleReadyInOrderScripts();
// Used to delay async scripts. These scripts are delayed until
// |NotifyDelayedAsyncScriptsMilestoneReached()| is called.
bool CanDelayAsyncScripts();
void DelayAsyncScriptUntilMilestoneReached(PendingScript*);
void PostTask(const base::Location&);
void PostTasksForReadyScripts(const base::Location&);
// Execute the first task in in_order_scripts_to_execute_soon_.
// Returns true if task was run, and false otherwise.
bool ExecuteInOrderTask();
// Execute any task in async_scripts_to_execute_soon_.
// Returns true if task was run, and false otherwise.
bool ExecuteAsyncTask();
void ExecuteTask();
bool IsExecutionSuspended();
Member<Document> document_;
HeapDeque<Member<PendingScript>> pending_in_order_scripts_;
HeapHashSet<Member<PendingScript>> pending_async_scripts_;
HeapDeque<Member<PendingScript>> pending_delayed_async_scripts_;
// http://www.whatwg.org/specs/web-apps/current-work/#set-of-scripts-that-will-execute-as-soon-as-possible
HeapDeque<Member<PendingScript>> async_scripts_to_execute_soon_;
HeapDeque<Member<PendingScript>> in_order_scripts_to_execute_soon_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
int number_of_in_order_scripts_with_pending_notification_ = 0;
// Whether script execution is suspended due to there being force deferred
// scripts that have not yet been executed. This is expected to be in sync
// with HTMLParserScriptRunner::suspended_async_script_execution_.
bool is_force_deferred_ = false;
// Scripts in |pending_delayed_async_scripts_| are delayed until the
// |NotifyDelayedAsyncScriptsMilestoneReached()| is called. After this point,
// the ScriptRunner no longer delays async scripts. This bool is used to
// ensure we don't continue delaying async scripts after this point. See the
// design doc:
// https://docs.google.com/document/u/1/d/1G-IUrT4enARZlsIrFQ4d4cRVe9MRTJASfWwolV09JZE/edit.
bool delay_async_script_milestone_reached_ = false;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_RUNNER_H_
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