1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
/* arena allocation for the frame tree and closely-related objects */
#ifndef nsPresArena_h___
#define nsPresArena_h___
#include "mozilla/ArenaObjectID.h"
#include "mozilla/ArenaRefPtr.h"
#include "mozilla/MemoryChecking.h" // Note: Do not remove this, needed for MOZ_HAVE_MEM_CHECKS below
#include "mozilla/MemoryReporting.h"
#include <stdint.h>
#include "nscore.h"
#include "nsDataHashtable.h"
#include "nsHashKeys.h"
#include "nsTArray.h"
#include "nsTHashtable.h"
#include "plarena.h"
struct nsArenaMemoryStats;
class nsPresArena {
public:
nsPresArena();
~nsPresArena();
/**
* Pool allocation with recycler lists indexed by object size, aSize.
*/
void* AllocateBySize(size_t aSize)
{
return Allocate(uint32_t(aSize) |
uint32_t(mozilla::eArenaObjectID_NON_OBJECT_MARKER), aSize);
}
void FreeBySize(size_t aSize, void* aPtr)
{
Free(uint32_t(aSize) |
uint32_t(mozilla::eArenaObjectID_NON_OBJECT_MARKER), aPtr);
}
/**
* Pool allocation with recycler lists indexed by frame-type ID.
* Every aID must always be used with the same object size, aSize.
*/
void* AllocateByFrameID(nsQueryFrame::FrameIID aID, size_t aSize)
{
return Allocate(aID, aSize);
}
void FreeByFrameID(nsQueryFrame::FrameIID aID, void* aPtr)
{
Free(aID, aPtr);
}
/**
* Pool allocation with recycler lists indexed by object-type ID (see above).
* Every aID must always be used with the same object size, aSize.
*/
void* AllocateByObjectID(mozilla::ArenaObjectID aID, size_t aSize)
{
return Allocate(aID, aSize);
}
void FreeByObjectID(mozilla::ArenaObjectID aID, void* aPtr)
{
Free(aID, aPtr);
}
/**
* Register an ArenaRefPtr to be cleared when this arena is about to
* be destroyed.
*
* (Defined in ArenaRefPtrInlines.h.)
*
* @param aPtr The ArenaRefPtr to clear.
* @param aObjectID The ArenaObjectID value that uniquely identifies
* the type of object the ArenaRefPtr holds.
*/
template<typename T>
void RegisterArenaRefPtr(mozilla::ArenaRefPtr<T>* aPtr);
/**
* Deregister an ArenaRefPtr that was previously registered with
* RegisterArenaRefPtr.
*/
template<typename T>
void DeregisterArenaRefPtr(mozilla::ArenaRefPtr<T>* aPtr)
{
MOZ_ASSERT(mArenaRefPtrs.Contains(aPtr));
mArenaRefPtrs.Remove(aPtr);
}
/**
* Clears all currently registered ArenaRefPtrs. This will be called during
* the destructor, but can be called by users of nsPresArena who want to
* ensure arena-allocated objects are released earlier.
*/
void ClearArenaRefPtrs();
/**
* Clears all currently registered ArenaRefPtrs for the given ArenaObjectID.
* This is called when we reconstruct the rule tree so that style contexts
* pointing into the old rule tree aren't released afterwards, triggering an
* assertion in ~nsStyleContext.
*/
void ClearArenaRefPtrs(mozilla::ArenaObjectID aObjectID);
/**
* Increment aArenaStats with sizes of interesting objects allocated in this
* arena and its mOther field with the size of everything else.
*/
void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
nsArenaMemoryStats* aArenaStats);
private:
void* Allocate(uint32_t aCode, size_t aSize);
void Free(uint32_t aCode, void* aPtr);
inline void ClearArenaRefPtrWithoutDeregistering(
void* aPtr,
mozilla::ArenaObjectID aObjectID);
// All keys to this hash table fit in 32 bits (see below) so we do not
// bother actually hashing them.
class FreeList : public PLDHashEntryHdr
{
public:
typedef uint32_t KeyType;
nsTArray<void *> mEntries;
size_t mEntrySize;
size_t mEntriesEverAllocated;
typedef const void* KeyTypePointer;
KeyTypePointer mKey;
explicit FreeList(KeyTypePointer aKey)
: mEntrySize(0), mEntriesEverAllocated(0), mKey(aKey) {}
// Default copy constructor and destructor are ok.
bool KeyEquals(KeyTypePointer const aKey) const
{ return mKey == aKey; }
static KeyTypePointer KeyToPointer(KeyType aKey)
{ return NS_INT32_TO_PTR(aKey); }
static PLDHashNumber HashKey(KeyTypePointer aKey)
{ return NS_PTR_TO_INT32(aKey); }
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{ return mEntries.ShallowSizeOfExcludingThis(aMallocSizeOf); }
enum { ALLOW_MEMMOVE = false };
};
nsTHashtable<FreeList> mFreeLists;
PLArenaPool mPool;
nsDataHashtable<nsPtrHashKey<void>, mozilla::ArenaObjectID> mArenaRefPtrs;
};
#endif
|
