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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "nsCOMArray.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/OperatorNewExtensions.h"
#include "nsCOMPtr.h"
// This specialization is private to nsCOMArray.
// It exists solely to automatically zero-out newly created array elements.
template <>
class nsTArrayElementTraits<nsISupports*> {
typedef nsISupports* E;
public:
// Zero out the value
static inline void Construct(E* aE) {
new (mozilla::KnownNotNull, static_cast<void*>(aE)) E();
}
// Invoke the copy-constructor in place.
template <class A>
static inline void Construct(E* aE, const A& aArg) {
new (mozilla::KnownNotNull, static_cast<void*>(aE)) E(aArg);
}
// Construct in place.
template <class... Args>
static inline void Emplace(E* aE, Args&&... aArgs) {
new (mozilla::KnownNotNull, static_cast<void*>(aE))
E(std::forward<Args>(aArgs)...);
}
// Invoke the destructor in place.
static inline void Destruct(E* aE) { aE->~E(); }
};
static void ReleaseObjects(nsTArray<nsISupports*>& aArray);
// implementations of non-trivial methods in nsCOMArray_base
nsCOMArray_base::nsCOMArray_base(const nsCOMArray_base& aOther) {
// make sure we do only one allocation
mArray.SetCapacity(aOther.Count());
AppendObjects(aOther);
}
nsCOMArray_base::~nsCOMArray_base() { Clear(); }
int32_t nsCOMArray_base::IndexOf(nsISupports* aObject,
uint32_t aStartIndex) const {
return mArray.IndexOf(aObject, aStartIndex);
}
int32_t nsCOMArray_base::IndexOfObject(nsISupports* aObject) const {
nsCOMPtr<nsISupports> supports = do_QueryInterface(aObject);
if (NS_WARN_IF(!supports)) {
return -1;
}
uint32_t i, count;
int32_t retval = -1;
count = mArray.Length();
for (i = 0; i < count; ++i) {
nsCOMPtr<nsISupports> arrayItem = do_QueryInterface(mArray[i]);
if (arrayItem == supports) {
retval = i;
break;
}
}
return retval;
}
bool nsCOMArray_base::EnumerateForwards(nsBaseArrayEnumFunc aFunc,
void* aData) const {
for (uint32_t index = 0; index < mArray.Length(); ++index) {
if (!(*aFunc)(mArray[index], aData)) {
return false;
}
}
return true;
}
bool nsCOMArray_base::EnumerateBackwards(nsBaseArrayEnumFunc aFunc,
void* aData) const {
for (uint32_t index = mArray.Length(); index--;) {
if (!(*aFunc)(mArray[index], aData)) {
return false;
}
}
return true;
}
bool nsCOMArray_base::InsertObjectAt(nsISupports* aObject, int32_t aIndex) {
if ((uint32_t)aIndex > mArray.Length()) {
return false;
}
mArray.InsertElementAt(aIndex, aObject);
NS_IF_ADDREF(aObject);
return true;
}
void nsCOMArray_base::InsertElementAt(uint32_t aIndex, nsISupports* aElement) {
mArray.InsertElementAt(aIndex, aElement);
NS_IF_ADDREF(aElement);
}
void nsCOMArray_base::InsertElementAt(uint32_t aIndex,
already_AddRefed<nsISupports> aElement) {
mArray.InsertElementAt(aIndex, aElement.take());
}
bool nsCOMArray_base::InsertObjectsAt(const nsCOMArray_base& aObjects,
int32_t aIndex) {
if ((uint32_t)aIndex > mArray.Length()) {
return false;
}
mArray.InsertElementsAt(aIndex, aObjects.mArray);
// need to addref all these
uint32_t count = aObjects.Length();
for (uint32_t i = 0; i < count; ++i) {
NS_IF_ADDREF(aObjects[i]);
}
return true;
}
void nsCOMArray_base::InsertElementsAt(uint32_t aIndex,
const nsCOMArray_base& aElements) {
mArray.InsertElementsAt(aIndex, aElements.mArray);
// need to addref all these
uint32_t count = aElements.Length();
for (uint32_t i = 0; i < count; ++i) {
NS_IF_ADDREF(aElements[i]);
}
}
void nsCOMArray_base::InsertElementsAt(uint32_t aIndex,
nsISupports* const* aElements,
uint32_t aCount) {
mArray.InsertElementsAt(aIndex, aElements, aCount);
// need to addref all these
for (uint32_t i = 0; i < aCount; ++i) {
NS_IF_ADDREF(aElements[i]);
}
}
void nsCOMArray_base::ReplaceObjectAt(nsISupports* aObject, int32_t aIndex) {
mArray.EnsureLengthAtLeast(aIndex + 1);
nsISupports* oldObject = mArray[aIndex];
// Make sure to addref first, in case aObject == oldObject
NS_IF_ADDREF(mArray[aIndex] = aObject);
NS_IF_RELEASE(oldObject);
}
bool nsCOMArray_base::RemoveObject(nsISupports* aObject) {
bool result = mArray.RemoveElement(aObject);
if (result) {
NS_IF_RELEASE(aObject);
}
return result;
}
bool nsCOMArray_base::RemoveObjectAt(int32_t aIndex) {
if (uint32_t(aIndex) < mArray.Length()) {
nsISupports* element = mArray[aIndex];
mArray.RemoveElementAt(aIndex);
NS_IF_RELEASE(element);
return true;
}
return false;
}
void nsCOMArray_base::RemoveElementAt(uint32_t aIndex) {
nsISupports* element = mArray[aIndex];
mArray.RemoveElementAt(aIndex);
NS_IF_RELEASE(element);
}
bool nsCOMArray_base::RemoveObjectsAt(int32_t aIndex, int32_t aCount) {
if (uint32_t(aIndex) + uint32_t(aCount) <= mArray.Length()) {
nsTArray<nsISupports*> elementsToDestroy(aCount);
elementsToDestroy.AppendElements(mArray.Elements() + aIndex, aCount);
mArray.RemoveElementsAt(aIndex, aCount);
ReleaseObjects(elementsToDestroy);
return true;
}
return false;
}
void nsCOMArray_base::RemoveElementsAt(uint32_t aIndex, uint32_t aCount) {
nsTArray<nsISupports*> elementsToDestroy(aCount);
elementsToDestroy.AppendElements(mArray.Elements() + aIndex, aCount);
mArray.RemoveElementsAt(aIndex, aCount);
ReleaseObjects(elementsToDestroy);
}
// useful for destructors
void ReleaseObjects(nsTArray<nsISupports*>& aArray) {
for (uint32_t i = 0; i < aArray.Length(); ++i) {
NS_IF_RELEASE(aArray[i]);
}
}
void nsCOMArray_base::Clear() {
nsTArray<nsISupports*> objects = std::move(mArray);
ReleaseObjects(objects);
}
bool nsCOMArray_base::SetCount(int32_t aNewCount) {
NS_ASSERTION(aNewCount >= 0, "SetCount(negative index)");
if (aNewCount < 0) {
return false;
}
int32_t count = mArray.Length();
if (count > aNewCount) {
RemoveObjectsAt(aNewCount, mArray.Length() - aNewCount);
}
mArray.SetLength(aNewCount);
return true;
}
|
