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/* 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() {
// The memory manager should only allocate once
assert (!_heap);
assert (_heapSize);
// 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) */
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