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| 1 /* | 1 /* |
| 2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
| 6 * met: | 6 * met: |
| 7 * | 7 * |
| 8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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| 36 #include "platform/heap/Handle.h" | 36 #include "platform/heap/Handle.h" |
| 37 #include <v8.h> | 37 #include <v8.h> |
| 38 | 38 |
| 39 // Helper to call webCoreInitializeScriptWrappableForInterface in the global nam
espace. | 39 // Helper to call webCoreInitializeScriptWrappableForInterface in the global nam
espace. |
| 40 template <class C> inline void initializeScriptWrappableHelper(C* object) | 40 template <class C> inline void initializeScriptWrappableHelper(C* object) |
| 41 { | 41 { |
| 42 void webCoreInitializeScriptWrappableForInterface(C*); | 42 void webCoreInitializeScriptWrappableForInterface(C*); |
| 43 webCoreInitializeScriptWrappableForInterface(object); | 43 webCoreInitializeScriptWrappableForInterface(object); |
| 44 } | 44 } |
| 45 | 45 |
| 46 namespace WebCore { | 46 namespace blink { |
| 47 | 47 |
| 48 /** | 48 /** |
| 49 * ScriptWrappable wraps a V8 object and its WrapperTypeInfo. | 49 * ScriptWrappable wraps a V8 object and its WrapperTypeInfo. |
| 50 * | 50 * |
| 51 * ScriptWrappable acts much like a v8::Persistent<> in that it keeps a | 51 * ScriptWrappable acts much like a v8::Persistent<> in that it keeps a |
| 52 * V8 object alive. Under the hood, however, it keeps either a TypeInfo | 52 * V8 object alive. Under the hood, however, it keeps either a TypeInfo |
| 53 * object or an actual v8 persistent (or is empty). | 53 * object or an actual v8 persistent (or is empty). |
| 54 * | 54 * |
| 55 * The physical state space of ScriptWrappable is: | 55 * The physical state space of ScriptWrappable is: |
| 56 * - uintptr_t m_wrapperOrTypeInfo; | 56 * - uintptr_t m_wrapperOrTypeInfo; |
| 57 * - if 0: the ScriptWrappable is uninitialized/empty. | 57 * - if 0: the ScriptWrappable is uninitialized/empty. |
| 58 * - if even: a pointer to WebCore::TypeInfo | 58 * - if even: a pointer to blink::TypeInfo |
| 59 * - if odd: a pointer to v8::Persistent<v8::Object> + 1. | 59 * - if odd: a pointer to v8::Persistent<v8::Object> + 1. |
| 60 * | 60 * |
| 61 * In other words, one integer represents one of two object pointers, | 61 * In other words, one integer represents one of two object pointers, |
| 62 * depending on its least signficiant bit, plus an uninitialized state. | 62 * depending on its least signficiant bit, plus an uninitialized state. |
| 63 * This class is meant to mask the logistics behind this. | 63 * This class is meant to mask the logistics behind this. |
| 64 * | 64 * |
| 65 * typeInfo() and newLocalWrapper will return appropriate values (possibly | 65 * typeInfo() and newLocalWrapper will return appropriate values (possibly |
| 66 * 0/empty) in all physical states. | 66 * 0/empty) in all physical states. |
| 67 * | 67 * |
| 68 * The state transitions are: | 68 * The state transitions are: |
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| 272 ASSERT(persistent == data.GetValue()); | 272 ASSERT(persistent == data.GetValue()); |
| 273 data.GetParameter()->disposeWrapper(data.GetValue()); | 273 data.GetParameter()->disposeWrapper(data.GetValue()); |
| 274 | 274 |
| 275 // FIXME: I noticed that 50%~ of minor GC cycle times can be consumed | 275 // FIXME: I noticed that 50%~ of minor GC cycle times can be consumed |
| 276 // inside data.GetParameter()->deref(), which causes Node destructions.
We should | 276 // inside data.GetParameter()->deref(), which causes Node destructions.
We should |
| 277 // make Node destructions incremental. | 277 // make Node destructions incremental. |
| 278 releaseObject(data.GetValue()); | 278 releaseObject(data.GetValue()); |
| 279 } | 279 } |
| 280 }; | 280 }; |
| 281 | 281 |
| 282 } // namespace WebCore | 282 } // namespace blink |
| 283 | 283 |
| 284 #endif // ScriptWrappable_h | 284 #endif // ScriptWrappable_h |
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