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
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/scummsys.h"
#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER)
#include "backends/plugins/elf/memory-manager.h"
#include "common/debug.h"
#include "common/util.h"
#include <malloc.h>
namespace Common {
DECLARE_SINGLETON(ELFMemoryManager);
}
ELFMemoryManager::ELFMemoryManager() :
_heap(0), _heapSize(0), _heapAlign(0),
_trackAllocs(false), _measuredSize(0), _measuredAlign(0),
_bytesAllocated(0) {}
ELFMemoryManager::~ELFMemoryManager() {
free(_heap);
_heap = 0;
}
void ELFMemoryManager::trackPlugin(bool value) {
assert(!_heap);
if (value == _trackAllocs)
return;
_trackAllocs = value;
if (_trackAllocs) { // start measuring
// start tracking allocations
_measuredAlign = 0;
} else { // we're done measuring
// get the total allocated size
uint32 measuredSize = _allocList.back().end() - _allocList.front().start;
_heapSize = MAX(_heapSize, measuredSize);
_heapAlign = MAX(_heapAlign, _measuredAlign);
_allocList.clear();
_bytesAllocated = 0; // reset
debug(2, "measured a plugin of size %d. Max size %d. Max align %d", measuredSize, _heapSize, _heapAlign);
}
}
void ELFMemoryManager::trackAlloc(uint32 align, uint32 size) {
if (!_measuredAlign)
_measuredAlign = align;
// use the allocate function to simulate allocation
allocateOnHeap(align, size);
}
void ELFMemoryManager::allocateHeap() {
if (!_heapSize) {
warning("ELFMemoryManager: Unable to allocate the heap as its size could not be determined.");
return;
}
// The memory manager should only allocate once
assert (!_heap);
// clear the list
_allocList.clear();
_bytesAllocated = 0;
debug(2, "ELFMemoryManager: allocating %d bytes aligned at %d as the \
plugin heap", _heapSize, _heapAlign);
// prepare the heap
if (_heapAlign)
_heap = ::memalign(_heapAlign, _heapSize);
else
_heap = ::malloc(_heapSize);
assert(_heap);
}
void *ELFMemoryManager::pluginAllocate(uint32 size) {
if (_heap) {
return pluginAllocate(sizeof(void *), size);
}
return ::malloc(size);
}
void *ELFMemoryManager::pluginAllocate(uint32 align, uint32 size) {
if (_heap) {
return allocateOnHeap(align, size);
}
return ::memalign(align, size);
}
void ELFMemoryManager::pluginDeallocate(void *ptr) {
if (_heap) {
return deallocateFromHeap(ptr);
}
return ::free(ptr);
}
// Allocate space for the request in our heap
void *ELFMemoryManager::allocateOnHeap(uint32 align, uint32 size) {
byte *lastAddress = (byte *)_heap;
// We can't allow allocations smaller than sizeof(Allocation). This could
// only be from non-plugin allocations and would cause infinite recursion
// when allocating our Allocation in the list.
if (size <= sizeof(Allocation))
return 0;
Common::List<Allocation>::iterator i;
for (i = _allocList.begin(); i != _allocList.end(); i++) {
if (i->start - lastAddress > (int)size)
break;
lastAddress = i->end();
// align to desired alignment
if (align) {
lastAddress = (byte *)( ((uint32)lastAddress + align - 1) & ~(align - 1) );
}
}
// Check if we exceeded our heap limit
// We skip this case if we're only tracking allocations
if (!_trackAllocs && ((uint32)lastAddress + size > (uint32)_heap + _heapSize)) {
debug(2, "failed to find space to allocate %d bytes", size);
return 0;
}
_allocList.insert(i, Allocation(lastAddress, size));
_bytesAllocated += size;
debug(7, "ELFMemoryManager: allocated %d bytes at %p. Total %d bytes",
size, lastAddress, _bytesAllocated);
return lastAddress;
}
void ELFMemoryManager::deallocateFromHeap(void *ptr) {
Common::List<Allocation>::iterator i;
for (i = _allocList.begin(); i != _allocList.end(); i++) {
if (i->start == ptr) {
_bytesAllocated -= (*i).size;
debug(7, "ELFMemoryManager: freed %d bytes at %p. Total %d bytes",
(*i).size, (*i).start, _bytesAllocated);
_allocList.erase(i);
break;
}
}
}
#endif /* defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) */
|
