1 files changed, 217 insertions, 0 deletions
diff --git a/dom/base/nsJSEnvironment.h b/dom/base/nsJSEnvironment.h
new file mode 100644
index 0000000000..c1a9baf52d
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+++ b/dom/base/nsJSEnvironment.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 nsJSEnvironment_h
+#define nsJSEnvironment_h
+
+#include "nsIScriptContext.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsCOMPtr.h"
+#include "nsIObserver.h"
+#include "prtime.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIXPConnect.h"
+#include "nsIArray.h"
+#include "mozilla/Attributes.h"
+#include "nsThreadUtils.h"
+#include "xpcpublic.h"
+
+class nsICycleCollectorListener;
+class nsScriptNameSpaceManager;
+
+namespace JS {
+class AutoValueVector;
+} // namespace JS
+
+namespace mozilla {
+template <class> class Maybe;
+struct CycleCollectorResults;
+} // namespace mozilla
+
+// The amount of time we wait between a request to GC (due to leaving
+// a page) and doing the actual GC.
+#define NS_GC_DELAY                 4000 // ms
+
+#define NS_MAJOR_FORGET_SKIPPABLE_CALLS 5
+
+class nsJSContext : public nsIScriptContext
+{
+public:
+  nsJSContext(bool aGCOnDestruction, nsIScriptGlobalObject* aGlobalObject);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
+                                                         nsIScriptContext)
+
+  virtual nsIScriptGlobalObject *GetGlobalObject() override;
+  inline nsIScriptGlobalObject *GetGlobalObjectRef() { return mGlobalObjectRef; }
+
+  virtual nsresult InitContext() override;
+  virtual bool IsContextInitialized() override;
+
+  virtual nsresult SetProperty(JS::Handle<JSObject*> aTarget, const char* aPropName, nsISupports* aVal) override;
+
+  virtual bool GetProcessingScriptTag() override;
+  virtual void SetProcessingScriptTag(bool aResult) override;
+
+  virtual nsresult InitClasses(JS::Handle<JSObject*> aGlobalObj) override;
+
+  virtual void WillInitializeContext() override;
+  virtual void DidInitializeContext() override;
+
+  virtual void SetWindowProxy(JS::Handle<JSObject*> aWindowProxy) override;
+  virtual JSObject* GetWindowProxy() override;
+
+  static void LoadStart();
+  static void LoadEnd();
+
+  enum IsShrinking {
+    ShrinkingGC,
+    NonShrinkingGC
+  };
+
+  enum IsIncremental {
+    IncrementalGC,
+    NonIncrementalGC
+  };
+
+  // Setup all the statics etc - safe to call multiple times after Startup().
+  void EnsureStatics();
+
+  static void GarbageCollectNow(JS::gcreason::Reason reason,
+                                IsIncremental aIncremental = NonIncrementalGC,
+                                IsShrinking aShrinking = NonShrinkingGC,
+                                int64_t aSliceMillis = 0);
+
+  // If aExtraForgetSkippableCalls is -1, forgetSkippable won't be
+  // called even if the previous collection was GC.
+  static void CycleCollectNow(nsICycleCollectorListener *aListener = nullptr,
+                              int32_t aExtraForgetSkippableCalls = 0);
+
+  // Run a cycle collector slice, using a heuristic to decide how long to run it.
+  static void RunCycleCollectorSlice();
+
+  // Run a cycle collector slice, using the given work budget.
+  static void RunCycleCollectorWorkSlice(int64_t aWorkBudget);
+
+  static void BeginCycleCollectionCallback();
+  static void EndCycleCollectionCallback(mozilla::CycleCollectorResults &aResults);
+
+  // Return the longest CC slice time since ClearMaxCCSliceTime() was last called.
+  static uint32_t GetMaxCCSliceTimeSinceClear();
+  static void ClearMaxCCSliceTime();
+
+  static void RunNextCollectorTimer();
+
+  static void PokeGC(JS::gcreason::Reason aReason, int aDelay = 0);
+  static void KillGCTimer();
+
+  static void PokeShrinkingGC();
+  static void KillShrinkingGCTimer();
+
+  static void MaybePokeCC();
+  static void KillCCTimer();
+  static void KillICCTimer();
+  static void KillFullGCTimer();
+  static void KillInterSliceGCTimer();
+
+  // Calling LikelyShortLivingObjectCreated() makes a GC more likely.
+  static void LikelyShortLivingObjectCreated();
+
+  static uint32_t CleanupsSinceLastGC();
+
+  nsIScriptGlobalObject* GetCachedGlobalObject()
+  {
+    // Verify that we have a global so that this
+    // does always return a null when GetGlobalObject() is null.
+    JSObject* global = GetWindowProxy();
+    return global ? mGlobalObjectRef.get() : nullptr;
+  }
+
+  static void NotifyDidPaint();
+protected:
+  virtual ~nsJSContext();
+
+  // Helper to convert xpcom datatypes to jsvals.
+  nsresult ConvertSupportsTojsvals(nsISupports *aArgs,
+                                   JS::Handle<JSObject*> aScope,
+                                   JS::AutoValueVector &aArgsOut);
+
+  nsresult AddSupportsPrimitiveTojsvals(nsISupports *aArg, JS::Value *aArgv);
+
+private:
+  void Destroy();
+
+  JS::Heap<JSObject*> mWindowProxy;
+
+  bool mIsInitialized;
+  bool mGCOnDestruction;
+  bool mProcessingScriptTag;
+
+  PRTime mModalStateTime;
+  uint32_t mModalStateDepth;
+
+  // mGlobalObjectRef ensures that the outer window stays alive as long as the
+  // context does. It is eventually collected by the cycle collector.
+  nsCOMPtr<nsIScriptGlobalObject> mGlobalObjectRef;
+
+  static bool DOMOperationCallback(JSContext *cx);
+};
+
+namespace mozilla {
+namespace dom {
+
+void StartupJSEnvironment();
+void ShutdownJSEnvironment();
+
+// Get the NameSpaceManager, creating if necessary
+nsScriptNameSpaceManager* GetNameSpaceManager();
+
+// Peek the NameSpaceManager, without creating it.
+nsScriptNameSpaceManager* PeekNameSpaceManager();
+
+// Runnable that's used to do async error reporting
+class AsyncErrorReporter final : public mozilla::Runnable
+{
+public:
+  // aWindow may be null if this error report is not associated with a window
+  explicit AsyncErrorReporter(xpc::ErrorReport* aReport)
+    : mReport(aReport)
+  {}
+
+  NS_IMETHOD Run() override
+  {
+    mReport->LogToConsole();
+    return NS_OK;
+  }
+
+protected:
+  RefPtr<xpc::ErrorReport> mReport;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+// An interface for fast and native conversion to/from nsIArray. If an object
+// supports this interface, JS can reach directly in for the argv, and avoid
+// nsISupports conversion. If this interface is not supported, the object will
+// be queried for nsIArray, and everything converted via xpcom objects.
+#define NS_IJSARGARRAY_IID \
+{ 0xb6acdac8, 0xf5c6, 0x432c, \
+  { 0xa8, 0x6e, 0x33, 0xee, 0xb1, 0xb0, 0xcd, 0xdc } }
+
+class nsIJSArgArray : public nsIArray
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSARGARRAY_IID)
+  // Bug 312003 describes why this must be "void **", but after calling argv
+  // may be cast to JS::Value* and the args found at:
+  //    ((JS::Value*)argv)[0], ..., ((JS::Value*)argv)[argc - 1]
+  virtual nsresult GetArgs(uint32_t *argc, void **argv) = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSArgArray, NS_IJSARGARRAY_IID)
+
+#endif /* nsJSEnvironment_h */