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gecko-dev
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gecko-dev/dom/base/nsFrameMessageManager.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsFrameMessageManager_h__
#define nsFrameMessageManager_h__
#include <cstdint>
#include <string.h>
#include <utility>
#include "ErrorList.h"
#include "js/RootingAPI.h"
#include "js/TypeDecls.h"
#include "js/Value.h"
#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/Assertions.h"
#include "mozilla/RefPtr.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/TypedEnumBits.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/dom/ipc/StructuredCloneData.h"
#include "nsCOMPtr.h"
#include "nsClassHashtable.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDataHashtable.h"
#include "nsHashKeys.h"
#include "nsIMessageManager.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsISupports.h"
#include "nsIWeakReferenceUtils.h"
#include "nsStringFwd.h"
#include "nsTArray.h"
#include "nsTObserverArray.h"
#include "nscore.h"
class nsFrameLoader;
class nsIRunnable;
namespace mozilla {
class ErrorResult;
namespace dom {
class ChildProcessMessageManager;
class ChromeMessageBroadcaster;
class ClonedMessageData;
class MessageBroadcaster;
class MessageListener;
class MessageListenerManager;
class MessageManagerReporter;
class ParentProcessMessageManager;
class ProcessMessageManager;
namespace ipc {
class MessageManagerCallback;
class WritableSharedMap;
// Note: we round the time we spend to the nearest millisecond. So a min value
// of 1 ms actually captures from 500us and above.
static const uint32_t kMinTelemetrySyncMessageManagerLatencyMs = 1;
enum class MessageManagerFlags {
MM_NONE = 0,
MM_CHROME = 1,
MM_GLOBAL = 2,
MM_PROCESSMANAGER = 4,
MM_BROADCASTER = 8,
MM_OWNSCALLBACK = 16
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(MessageManagerFlags);
void UnpackClonedMessageDataForParent(const ClonedMessageData& aClonedData,
StructuredCloneData& aData);
void UnpackClonedMessageDataForChild(const ClonedMessageData& aClonedData,
StructuredCloneData& aData);
} // namespace ipc
} // namespace dom
} // namespace mozilla
struct nsMessageListenerInfo {
bool operator==(const nsMessageListenerInfo& aOther) const {
return &aOther == this;
}
// If mWeakListener is null then mStrongListener holds a MessageListener.
// If mWeakListener is non-null then mStrongListener contains null.
RefPtr<mozilla::dom::MessageListener> mStrongListener;
nsWeakPtr mWeakListener;
bool mListenWhenClosed;
};
class nsFrameMessageManager : public nsIMessageSender {
friend class mozilla::dom::MessageManagerReporter;
typedef mozilla::dom::ipc::StructuredCloneData StructuredCloneData;
protected:
typedef mozilla::dom::ipc::MessageManagerFlags MessageManagerFlags;
nsFrameMessageManager(mozilla::dom::ipc::MessageManagerCallback* aCallback,
MessageManagerFlags aFlags);
virtual ~nsFrameMessageManager();
public:
explicit nsFrameMessageManager(
mozilla::dom::ipc::MessageManagerCallback* aCallback)
: nsFrameMessageManager(aCallback, MessageManagerFlags::MM_NONE) {}
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsFrameMessageManager)
void MarkForCC();
// MessageListenerManager
void AddMessageListener(const nsAString& aMessageName,
mozilla::dom::MessageListener& aListener,
bool aListenWhenClosed, mozilla::ErrorResult& aError);
void RemoveMessageListener(const nsAString& aMessageName,
mozilla::dom::MessageListener& aListener,
mozilla::ErrorResult& aError);
void AddWeakMessageListener(const nsAString& aMessageName,
mozilla::dom::MessageListener& aListener,
mozilla::ErrorResult& aError);
void RemoveWeakMessageListener(const nsAString& aMessageName,
mozilla::dom::MessageListener& aListener,
mozilla::ErrorResult& aError);
// MessageSender
void SendAsyncMessage(JSContext* aCx, const nsAString& aMessageName,
JS::Handle<JS::Value> aObj,
JS::Handle<JS::Value> aTransfers,
mozilla::ErrorResult& aError) {
DispatchAsyncMessage(aCx, aMessageName, aObj, aTransfers, aError);
}
already_AddRefed<mozilla::dom::ProcessMessageManager>
GetProcessMessageManager(mozilla::ErrorResult& aError);
void GetRemoteType(nsACString& aRemoteType,
mozilla::ErrorResult& aError) const;
// SyncMessageSender
void SendSyncMessage(JSContext* aCx, const nsAString& aMessageName,
JS::Handle<JS::Value> aObj, nsTArray<JS::Value>& aResult,
mozilla::ErrorResult& aError);
// GlobalProcessScriptLoader
void GetInitialProcessData(JSContext* aCx,
JS::MutableHandle<JS::Value> aInitialProcessData,
mozilla::ErrorResult& aError);
mozilla::dom::ipc::WritableSharedMap* SharedData();
NS_DECL_NSIMESSAGESENDER
static mozilla::dom::ProcessMessageManager* NewProcessMessageManager(
bool aIsRemote);
void ReceiveMessage(nsISupports* aTarget, nsFrameLoader* aTargetFrameLoader,
const nsAString& aMessage, bool aIsSync,
StructuredCloneData* aCloneData,
nsTArray<StructuredCloneData>* aRetVal,
mozilla::ErrorResult& aError) {
ReceiveMessage(aTarget, aTargetFrameLoader, mClosed, aMessage, aIsSync,
aCloneData, aRetVal, aError);
}
void Disconnect(bool aRemoveFromParent = true);
void Close();
void SetCallback(mozilla::dom::ipc::MessageManagerCallback* aCallback);
mozilla::dom::ipc::MessageManagerCallback* GetCallback() { return mCallback; }
nsresult DispatchAsyncMessageInternal(JSContext* aCx,
const nsAString& aMessage,
StructuredCloneData& aData);
bool IsGlobal() { return mGlobal; }
bool IsBroadcaster() { return mIsBroadcaster; }
bool IsChrome() { return mChrome; }
// GetGlobalMessageManager creates the global message manager if it hasn't
// been yet.
static already_AddRefed<mozilla::dom::ChromeMessageBroadcaster>
GetGlobalMessageManager();
static mozilla::dom::ParentProcessMessageManager* GetParentProcessManager() {
return sParentProcessManager;
}
static mozilla::dom::ChildProcessMessageManager* GetChildProcessManager() {
return sChildProcessManager;
}
static void SetChildProcessManager(
mozilla::dom::ChildProcessMessageManager* aManager) {
sChildProcessManager = aManager;
}
static bool GetParamsForMessage(JSContext* aCx, const JS::Value& aValue,
const JS::Value& aTransfer,
StructuredCloneData& aData);
void SetInitialProcessData(JS::HandleValue aInitialData);
void LoadPendingScripts();
protected:
friend class MMListenerRemover;
virtual mozilla::dom::MessageBroadcaster* GetParentManager() {
return nullptr;
}
virtual void ClearParentManager(bool aRemove) {}
void DispatchAsyncMessage(JSContext* aCx, const nsAString& aMessageName,
JS::Handle<JS::Value> aObj,
JS::Handle<JS::Value> aTransfers,
mozilla::ErrorResult& aError);
void ReceiveMessage(nsISupports* aTarget, nsFrameLoader* aTargetFrameLoader,
bool aTargetClosed, const nsAString& aMessage,
bool aIsSync, StructuredCloneData* aCloneData,
nsTArray<StructuredCloneData>* aRetVal,
mozilla::ErrorResult& aError);
void LoadScript(const nsAString& aURL, bool aAllowDelayedLoad,
bool aRunInGlobalScope, mozilla::ErrorResult& aError);
void RemoveDelayedScript(const nsAString& aURL);
void GetDelayedScripts(JSContext* aCx, nsTArray<nsTArray<JS::Value>>& aList,
mozilla::ErrorResult& aError);
// We keep the message listeners as arrays in a hastable indexed by the
// message name. That gives us fast lookups in ReceiveMessage().
nsClassHashtable<nsStringHashKey,
nsAutoTObserverArray<nsMessageListenerInfo, 1>>
mListeners;
nsTArray<RefPtr<mozilla::dom::MessageListenerManager>> mChildManagers;
bool mChrome; // true if we're in the chrome process
bool mGlobal; // true if we're the global frame message manager
bool mIsProcessManager; // true if the message manager belongs to the process
// realm
bool mIsBroadcaster; // true if the message manager is a broadcaster
bool mOwnsCallback;
bool mHandlingMessage;
bool mClosed; // true if we can no longer send messages
bool mDisconnected;
mozilla::dom::ipc::MessageManagerCallback* mCallback;
mozilla::UniquePtr<mozilla::dom::ipc::MessageManagerCallback> mOwnedCallback;
nsTArray<nsString> mPendingScripts;
nsTArray<bool> mPendingScriptsGlobalStates;
JS::Heap<JS::Value> mInitialProcessData;
RefPtr<mozilla::dom::ipc::WritableSharedMap> mSharedData;
void LoadPendingScripts(nsFrameMessageManager* aManager,
nsFrameMessageManager* aChildMM);
public:
static mozilla::dom::ParentProcessMessageManager* sParentProcessManager;
static nsFrameMessageManager* sSameProcessParentManager;
static nsTArray<nsCOMPtr<nsIRunnable>>* sPendingSameProcessAsyncMessages;
private:
static mozilla::dom::ChildProcessMessageManager* sChildProcessManager;
};
/* A helper class for taking care of many details for async message sending
within a single process. Intended to be used like so:
class MyAsyncMessage : public nsSameProcessAsyncMessageBase, public Runnable
{
NS_IMETHOD Run() {
ReceiveMessage(..., ...);
return NS_OK;
}
};
RefPtr<nsSameProcessAsyncMessageBase> ev = new MyAsyncMessage();
nsresult rv = ev->Init(...);
if (NS_SUCCEEDED(rv)) {
NS_DispatchToMainThread(ev);
}
*/
class nsSameProcessAsyncMessageBase {
public:
typedef mozilla::dom::ipc::StructuredCloneData StructuredCloneData;
nsSameProcessAsyncMessageBase();
nsresult Init(const nsAString& aMessage, StructuredCloneData& aData);
void ReceiveMessage(nsISupports* aTarget, nsFrameLoader* aTargetFrameLoader,
nsFrameMessageManager* aManager);
private:
nsSameProcessAsyncMessageBase(const nsSameProcessAsyncMessageBase&);
nsString mMessage;
StructuredCloneData mData;
#ifdef DEBUG
bool mCalledInit;
#endif
};
class nsScriptCacheCleaner;
struct nsMessageManagerScriptHolder {
nsMessageManagerScriptHolder(JSContext* aCx, JSScript* aScript)
: mScript(aCx, aScript) {
MOZ_COUNT_CTOR(nsMessageManagerScriptHolder);
}
MOZ_COUNTED_DTOR(nsMessageManagerScriptHolder)
JS::PersistentRooted<JSScript*> mScript;
};
class nsMessageManagerScriptExecutor {
public:
static void PurgeCache();
static void Shutdown();
void MarkScopesForCC();
protected:
friend class nsMessageManagerScriptCx;
nsMessageManagerScriptExecutor() {
MOZ_COUNT_CTOR(nsMessageManagerScriptExecutor);
}
MOZ_COUNTED_DTOR(nsMessageManagerScriptExecutor)
void DidCreateScriptLoader();
void LoadScriptInternal(JS::Handle<JSObject*> aMessageManager,
const nsAString& aURL, bool aRunInUniqueScope);
void TryCacheLoadAndCompileScript(const nsAString& aURL,
bool aRunInUniqueScope, bool aShouldCache,
JS::Handle<JSObject*> aMessageManager,
JS::MutableHandle<JSScript*> aScriptp);
bool Init();
void Trace(const TraceCallbacks& aCallbacks, void* aClosure);
void Unlink();
AutoTArray<JS::Heap<JSObject*>, 2> mAnonymousGlobalScopes;
// Returns true if this is a process message manager. There should only be a
// single process message manager per session, so instances of this type will
// optimize their script loading to avoid unnecessary duplication.
virtual bool IsProcessScoped() const { return false; }
static nsDataHashtable<nsStringHashKey, nsMessageManagerScriptHolder*>*
sCachedScripts;
static mozilla::StaticRefPtr<nsScriptCacheCleaner> sScriptCacheCleaner;
};
class nsScriptCacheCleaner final : public nsIObserver {
~nsScriptCacheCleaner() = default;
NS_DECL_ISUPPORTS
nsScriptCacheCleaner() {
nsCOMPtr<nsIObserverService> obsSvc =
mozilla::services::GetObserverService();
if (obsSvc) {
obsSvc->AddObserver(this, "message-manager-flush-caches", false);
obsSvc->AddObserver(this, "xpcom-shutdown", false);
}
}
NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) override {
if (strcmp("message-manager-flush-caches", aTopic) == 0) {
nsMessageManagerScriptExecutor::PurgeCache();
} else if (strcmp("xpcom-shutdown", aTopic) == 0) {
nsMessageManagerScriptExecutor::Shutdown();
}
return NS_OK;
}
};
#endif
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