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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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114 // completed full GC (expected to be zero). | 114 // completed full GC (expected to be zero). |
115 static int previous_marked_count() { return previous_marked_count_; } | 115 static int previous_marked_count() { return previous_marked_count_; } |
116 | 116 |
117 // During a full GC, there is a stack-allocated GCTracer that is used for | 117 // During a full GC, there is a stack-allocated GCTracer that is used for |
118 // bookkeeping information. Return a pointer to that tracer. | 118 // bookkeeping information. Return a pointer to that tracer. |
119 static GCTracer* tracer() { return tracer_; } | 119 static GCTracer* tracer() { return tracer_; } |
120 | 120 |
121 #ifdef DEBUG | 121 #ifdef DEBUG |
122 // Checks whether performing mark-compact collection. | 122 // Checks whether performing mark-compact collection. |
123 static bool in_use() { return state_ > PREPARE_GC; } | 123 static bool in_use() { return state_ > PREPARE_GC; } |
| 124 static bool are_map_pointers_encoded() { return state_ == UPDATE_POINTERS; } |
124 #endif | 125 #endif |
125 | 126 |
126 // Determine type of object and emit deletion log event. | 127 // Determine type of object and emit deletion log event. |
127 static void ReportDeleteIfNeeded(HeapObject* obj); | 128 static void ReportDeleteIfNeeded(HeapObject* obj); |
128 | 129 |
| 130 // Distinguishable invalid map encodings (for single word and multiple words) |
| 131 // that indicate free regions. |
| 132 static const uint32_t kSingleFreeEncoding = 0; |
| 133 static const uint32_t kMultiFreeEncoding = 1; |
| 134 |
129 private: | 135 private: |
130 #ifdef DEBUG | 136 #ifdef DEBUG |
131 enum CollectorState { | 137 enum CollectorState { |
132 IDLE, | 138 IDLE, |
133 PREPARE_GC, | 139 PREPARE_GC, |
134 MARK_LIVE_OBJECTS, | 140 MARK_LIVE_OBJECTS, |
135 SWEEP_SPACES, | 141 SWEEP_SPACES, |
136 ENCODE_FORWARDING_ADDRESSES, | 142 ENCODE_FORWARDING_ADDRESSES, |
137 UPDATE_POINTERS, | 143 UPDATE_POINTERS, |
138 RELOCATE_OBJECTS | 144 RELOCATE_OBJECTS |
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450 | 456 |
451 friend class UnmarkObjectVisitor; | 457 friend class UnmarkObjectVisitor; |
452 static void UnmarkObject(HeapObject* obj); | 458 static void UnmarkObject(HeapObject* obj); |
453 #endif | 459 #endif |
454 }; | 460 }; |
455 | 461 |
456 | 462 |
457 } } // namespace v8::internal | 463 } } // namespace v8::internal |
458 | 464 |
459 #endif // V8_MARK_COMPACT_H_ | 465 #endif // V8_MARK_COMPACT_H_ |
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