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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Redistribution and use in source and binary forms, with or without |
3 // found in the LICENSE file. | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: |
| 5 // |
| 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided |
| 11 // with the distribution. |
| 12 // * Neither the name of Google Inc. nor the names of its |
| 13 // contributors may be used to endorse or promote products derived |
| 14 // from this software without specific prior written permission. |
| 15 // |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
4 | 27 |
5 #ifndef V8_OBJECTS_VISITING_H_ | 28 #ifndef V8_OBJECTS_VISITING_H_ |
6 #define V8_OBJECTS_VISITING_H_ | 29 #define V8_OBJECTS_VISITING_H_ |
7 | 30 |
8 #include "objects.h" | 31 #include "allocation.h" |
9 #include "spaces.h" | |
10 | 32 |
11 // This file provides base classes and auxiliary methods for defining | 33 // This file provides base classes and auxiliary methods for defining |
12 // static object visitors used during GC. | 34 // static object visitors used during GC. |
13 // Visiting HeapObject body with a normal ObjectVisitor requires performing | 35 // Visiting HeapObject body with a normal ObjectVisitor requires performing |
14 // two switches on object's instance type to determine object size and layout | 36 // two switches on object's instance type to determine object size and layout |
15 // and one or more virtual method calls on visitor itself. | 37 // and one or more virtual method calls on visitor itself. |
16 // Static visitor is different: it provides a dispatch table which contains | 38 // Static visitor is different: it provides a dispatch table which contains |
17 // pointers to specialized visit functions. Each map has the visitor_id | 39 // pointers to specialized visit functions. Each map has the visitor_id |
18 // field which contains an index of specialized visitor to use. | 40 // field which contains an index of specialized visitor to use. |
19 | 41 |
20 namespace v8 { | 42 namespace v8 { |
21 namespace internal { | 43 namespace internal { |
22 | 44 |
| 45 |
23 // Base class for all static visitors. | 46 // Base class for all static visitors. |
24 class StaticVisitorBase : public AllStatic { | 47 class StaticVisitorBase : public AllStatic { |
25 public: | 48 public: |
26 #define VISITOR_ID_LIST(V) \ | 49 #define VISITOR_ID_LIST(V) \ |
27 V(SeqOneByteString) \ | 50 V(SeqOneByteString) \ |
28 V(SeqTwoByteString) \ | 51 V(SeqTwoByteString) \ |
29 V(ShortcutCandidate) \ | 52 V(ShortcutCandidate) \ |
30 V(ByteArray) \ | 53 V(ByteArray) \ |
31 V(FreeSpace) \ | 54 V(FreeSpace) \ |
32 V(FixedArray) \ | 55 V(FixedArray) \ |
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470 // access the next-element pointers. | 493 // access the next-element pointers. |
471 template <class T> | 494 template <class T> |
472 Object* VisitWeakList(Heap* heap, | 495 Object* VisitWeakList(Heap* heap, |
473 Object* list, | 496 Object* list, |
474 WeakObjectRetainer* retainer, | 497 WeakObjectRetainer* retainer, |
475 bool record_slots); | 498 bool record_slots); |
476 | 499 |
477 } } // namespace v8::internal | 500 } } // namespace v8::internal |
478 | 501 |
479 #endif // V8_OBJECTS_VISITING_H_ | 502 #endif // V8_OBJECTS_VISITING_H_ |
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