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Issue 13786002: [WIP] New GC related APIs. (Closed) Base URL: git://github.com/v8/v8.git@master
Patch Set: code review (svenpanne) Created 7 years, 8 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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135 template <class T> class Persistent; 135 template <class T> class Persistent;
136 136
137 namespace internal { 137 namespace internal {
138 class Arguments; 138 class Arguments;
139 class Heap; 139 class Heap;
140 class HeapObject; 140 class HeapObject;
141 class Isolate; 141 class Isolate;
142 class Object; 142 class Object;
143 } 143 }
144 144
145 // Generic-purpose unique identifier.
146 class UniqueId {
147 public:
148 UniqueId()
Sven Panne 2013/04/10 10:58:52 Do we need this? I can't imagine a use case, Uniqu
marja 2013/04/10 13:14:51 Removed.
149 : data_(0) {}
150
151 explicit UniqueId(intptr_t data)
152 : data_(data) {}
153
154 bool operator==(const UniqueId& other) const {
155 return data_ == other.data_;
156 }
157
158 bool operator!=(const UniqueId& other) const {
159 return data_ == other.data_;
160 }
161
162 bool operator<(const UniqueId& other) const {
163 return data_ < other.data_;
164 }
165
166 private:
167 intptr_t data_;
168 };
169
145 170
146 // --- Weak Handles --- 171 // --- Weak Handles ---
147 172
148 173
149 /** 174 /**
150 * A weak reference callback function. 175 * A weak reference callback function.
151 * 176 *
152 * This callback should either explicitly invoke Dispose on |object| if 177 * This callback should either explicitly invoke Dispose on |object| if
153 * V8 wrapper is not needed anymore, or 'revive' it by invocation of MakeWeak. 178 * V8 wrapper is not needed anymore, or 'revive' it by invocation of MakeWeak.
154 * 179 *
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3433 * object in the group is alive, all objects in the group are alive. 3458 * object in the group is alive, all objects in the group are alive.
3434 * After each garbage collection, object groups are removed. It is 3459 * After each garbage collection, object groups are removed. It is
3435 * intended to be used in the before-garbage-collection callback 3460 * intended to be used in the before-garbage-collection callback
3436 * function, for instance to simulate DOM tree connections among JS 3461 * function, for instance to simulate DOM tree connections among JS
3437 * wrapper objects. Object groups for all dependent handles need to 3462 * wrapper objects. Object groups for all dependent handles need to
3438 * be provided for kGCTypeMarkSweepCompact collections, for all other 3463 * be provided for kGCTypeMarkSweepCompact collections, for all other
3439 * garbage collection types it is sufficient to provide object groups 3464 * garbage collection types it is sufficient to provide object groups
3440 * for partially dependent handles only. 3465 * for partially dependent handles only.
3441 * See v8-profiler.h for RetainedObjectInfo interface description. 3466 * See v8-profiler.h for RetainedObjectInfo interface description.
3442 */ 3467 */
3468 // TODO(marja): deprecate AddObjectGroup. Use SetObjectGroupID and
3469 // SetRetainedObjectInfo instead.
3443 static void AddObjectGroup(Persistent<Value>* objects, 3470 static void AddObjectGroup(Persistent<Value>* objects,
3444 size_t length, 3471 size_t length,
3445 RetainedObjectInfo* info = NULL); 3472 RetainedObjectInfo* info = NULL);
3446 static void AddObjectGroup(Isolate* isolate, 3473 static void AddObjectGroup(Isolate* isolate,
3447 Persistent<Value>* objects, 3474 Persistent<Value>* objects,
3448 size_t length, 3475 size_t length,
3449 RetainedObjectInfo* info = NULL); 3476 RetainedObjectInfo* info = NULL);
3450 3477
3478 static void SetObjectGroupId(Isolate* isolate,
3479 const Persistent<Value>& object,
3480 UniqueId id);
3481
3482 static void SetRetainedObjectInfo(Isolate* isolate,
3483 UniqueId id,
3484 RetainedObjectInfo* info);
3485
3451 /** 3486 /**
3452 * Allows the host application to declare implicit references between 3487 * Allows the host application to declare implicit references between
3453 * the objects: if |parent| is alive, all |children| are alive too. 3488 * the objects: if |parent| is alive, all |children| are alive too.
3454 * After each garbage collection, all implicit references 3489 * After each garbage collection, all implicit references
3455 * are removed. It is intended to be used in the before-garbage-collection 3490 * are removed. It is intended to be used in the before-garbage-collection
3456 * callback function. 3491 * callback function.
3457 */ 3492 */
3458 static void AddImplicitReferences(Persistent<Object> parent, 3493 static void AddImplicitReferences(Persistent<Object> parent,
3459 Persistent<Value>* children, 3494 Persistent<Value>* children,
3460 size_t length); 3495 size_t length);
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5039 5074
5040 5075
5041 } // namespace v8 5076 } // namespace v8
5042 5077
5043 5078
5044 #undef V8EXPORT 5079 #undef V8EXPORT
5045 #undef TYPE_CHECK 5080 #undef TYPE_CHECK
5046 5081
5047 5082
5048 #endif // V8_H_ 5083 #endif // V8_H_
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