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26 #ifndef npruntime_priv_h
27 #define npruntime_priv_h
29 #include <bindings/npruntime.h>
36 _NPN_InitializeVariantWithStringCopy() will copy string data. The string data
37 will be deallocated by calls to NPReleaseVariantValue().
39 void _NPN_InitializeVariantWithStringCopy(NPVariant*, const NPString*);
40 void _NPN_DeallocateObject(NPObject*);
42 // The following routines allow the browser to aggressively cleanup NPObjects
43 // on a per plugin basis. All NPObjects used through the NPRuntime API should
44 // be "registered" while they are alive. After an object has been
45 // deleted, it is possible for Javascript to have a reference to that object
46 // which has not yet been garbage collected. Javascript access to NPObjects
47 // will reference this registry to determine if the object is accessible or
50 // Windows introduces an additional complication for objects created by the
51 // plugin. Plugins load inside of a DLL. Each DLL has it's own heap. If
52 // the browser unloads the plugin DLL, all objects created within the DLL's
53 // heap instantly become invalid. Normally, when WebKit drops the reference
54 // on the top-level plugin object, it tells the plugin manager that the
55 // plugin can be destroyed, which can unload the DLL. So, we must eliminate
56 // all pointers to any object ever created by the plugin.
58 // We generally associate NPObjects with an owner. The owner of an NPObject
59 // is an NPObject which, when destroyed, also destroys all objects it owns.
60 // For example, if an NPAPI plugin creates 10 sub-NPObjects, all 11 objects
61 // (the NPAPI plugin + its 10 sub-objects) should become inaccessible
64 // The ownership hierarchy is flat, and not a tree. Imagine the following
68 // +-- Creates -----> Object1
70 // +-- Creates -----> Object2
72 // PluginObject will be the "owner" for both Object1 and Object2.
74 // Register an NPObject with the runtime. If the owner is NULL, the
75 // object is treated as an owning object. If owner is not NULL,
76 // this object will be registered as owned by owner's top-level owner.
77 void _NPN_RegisterObject(NPObject*, NPObject* owner);
79 // Unregister an NPObject with the runtime. If obj is an owning
80 // object, this call will also unregister all of the owned objects.
81 void _NPN_UnregisterObject(NPObject*);
83 // Check to see if an object is registered with the runtime.
84 // Return true if registered, false otherwise.
85 bool _NPN_IsAlive(NPObject*);
88 } /* end extern "C" */
91 #endif // npruntime_priv_h