mirror of
https://github.com/dart-lang/sdk
synced 2024-11-05 18:22:09 +00:00
5a3bace198
Requested by IntelliJ who are running into issues with ids expiring too quickly. This is a temporary solution for 1.13 until we have a better id namespace for debuggers to use. R=turnidge@google.com Review URL: https://codereview.chromium.org/1403503003 .
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
#ifndef VM_OBJECT_ID_RING_H_
|
|
#define VM_OBJECT_ID_RING_H_
|
|
|
|
namespace dart {
|
|
|
|
// Forward declarations.
|
|
class RawObject;
|
|
class Isolate;
|
|
class ObjectPointerVisitor;
|
|
class JSONStream;
|
|
|
|
// A ring buffer of object pointers that have been given an id. An object
|
|
// may be pointed to by multiple ids. Objects contained in the ring will
|
|
// be preserved across scavenges but not old space collections.
|
|
// When the ring buffer wraps around older objects will be replaced and their
|
|
// ids will be invalidated.
|
|
class ObjectIdRing {
|
|
public:
|
|
enum LookupResult {
|
|
kValid = 0,
|
|
kInvalid, // Malformed ring id (used in service.cc).
|
|
kCollected, // Entry was reclaimed due to a full GC (entries are weak).
|
|
kExpired, // Entry was evicted during an insertion into a full ring.
|
|
};
|
|
|
|
enum IdPolicy {
|
|
kAllocateId, // Always allocate a new object id.
|
|
kReuseId, // If the object is already in the ring, reuse id.
|
|
// Otherwise allocate a new object id.
|
|
kNumIdPolicy,
|
|
};
|
|
|
|
static const int32_t kMaxId = 0x3FFFFFFF;
|
|
static const int32_t kInvalidId = -1;
|
|
static const int32_t kDefaultCapacity = 8192;
|
|
|
|
static void Init(Isolate* isolate, int32_t capacity = kDefaultCapacity);
|
|
|
|
~ObjectIdRing();
|
|
|
|
// Adds the argument to the ring and returns its id. Note we do not allow
|
|
// adding Object::null().
|
|
int32_t GetIdForObject(RawObject* raw_obj, IdPolicy policy = kAllocateId);
|
|
|
|
// Returns Object::null() when the result is not kValid.
|
|
RawObject* GetObjectForId(int32_t id, LookupResult* kind);
|
|
|
|
void VisitPointers(ObjectPointerVisitor* visitor);
|
|
|
|
void PrintJSON(JSONStream* js);
|
|
|
|
private:
|
|
friend class ObjectIdRingTestHelper;
|
|
|
|
void SetCapacityAndMaxSerial(int32_t capacity, int32_t max_serial);
|
|
int32_t FindExistingIdForObject(RawObject* raw_obj);
|
|
|
|
ObjectIdRing(Isolate* isolate, int32_t capacity);
|
|
Isolate* isolate_;
|
|
RawObject** table_;
|
|
int32_t max_serial_;
|
|
int32_t capacity_;
|
|
int32_t serial_num_;
|
|
bool wrapped_;
|
|
|
|
RawObject** table() {
|
|
return table_;
|
|
}
|
|
int32_t table_size() {
|
|
return capacity_;
|
|
}
|
|
|
|
int32_t NextSerial();
|
|
int32_t AllocateNewId(RawObject* object);
|
|
int32_t IndexOfId(int32_t id);
|
|
int32_t IdOfIndex(int32_t index);
|
|
bool IsValidContiguous(int32_t id);
|
|
bool IsValidId(int32_t id);
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(ObjectIdRing);
|
|
};
|
|
|
|
} // namespace dart
|
|
|
|
#endif // VM_OBJECT_ID_RING_H_
|