johnmccutchan@google.com
7f993f87ee
R=iposva@google.com Review URL: https://codereview.chromium.org//18259014 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25063 260f80e4-7a28-3924-810f-c04153c831b5
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_OBJECT_ID_RING_H_
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#define VM_OBJECT_ID_RING_H_
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namespace dart {
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// Forward declarations.
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class RawObject;
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class Isolate;
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class ObjectPointerVisitor;
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// A ring buffer of object pointers that have been given an id. An object
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// may be pointed to by multiple ids. Objects contained in the ring will
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// be preserved across scavenges but not old space collections.
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// When the ring buffer wraps around older objects will be replaced and their
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// ids will be invalidated.
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class ObjectIdRing {
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public:
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static const int32_t kMaxId = 0x3FFFFFFF;
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static const int32_t kInvalidId = -1;
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static const int32_t kDefaultCapacity = 1024;
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static void Init(Isolate* isolate, int32_t capacity = kDefaultCapacity);
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~ObjectIdRing();
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int32_t GetIdForObject(RawObject* raw_obj);
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RawObject* GetObjectForId(int32_t id);
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void VisitPointers(ObjectPointerVisitor* visitor);
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private:
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friend class ObjectIdRingTestHelper;
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void SetCapacityAndMaxSerial(int32_t capacity, int32_t max_serial);
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ObjectIdRing(Isolate* isolate, int32_t capacity);
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Isolate* isolate_;
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RawObject** table_;
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int32_t max_serial_;
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int32_t capacity_;
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int32_t serial_num_;
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bool wrapped_;
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RawObject** table() {
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return table_;
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}
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int32_t table_size() {
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return capacity_;
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}
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int32_t NextSerial();
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int32_t AllocateNewId(RawObject* object);
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int32_t IndexOfId(int32_t id);
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bool IsValidContiguous(int32_t id);
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bool IsValidId(int32_t id);
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DISALLOW_COPY_AND_ASSIGN(ObjectIdRing);
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};
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} // namespace dart
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#endif // VM_OBJECT_ID_RING_H_
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