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/*******************************************************************************
* Copyright (c) 2012 protos software gmbh (http://www.protos.de).
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* CONTRIBUTORS:
* Henrik Rentz-Reichert (initial contribution)
*
*******************************************************************************/
#include "base/etMemory_FreeList.h"
#include "debugging/etLogger.h"
#include "debugging/etMSCLogger.h"
#define UNUSED_LIST 0
#define DEBUG_FREE_LISTS 1
#define OBJ_OFFSET etALIGNMENT
#define DO_LOCK \
if (self->base.lock!=NULL) { \
self->base.lock->lockFct(self->base.lock->lockData); \
}
#define DO_UNLOCK \
if (self->base.lock!=NULL) { \
self->base.lock->unlockFct(self->base.lock->lockData); \
}
typedef struct etFreeListObj {
struct etFreeListObj* next;
} etFreeListObj;
typedef struct etFreeListInfo {
etUInt16 objsize; /**< the size in bytes of the objects in this list */
etFreeListObj* head; /**< the list head */
#if DEBUG_FREE_LISTS
etUInt16 nobjects; /**< the number of objects in the list */
#endif
} etFreeListInfo;
typedef struct etFreeListMemory {
etMemory base; /** the "base class" */
etUInt8* current; /**< next free position on the heap */
etUInt16 nslots; /**< number of free lists */
roundUpSize* roundUp; /**< rounding method (identity by default) */
etFreeListInfo freelists[1]; /**< array of free list infos (array used with size nslots) */
} etFreeListMemory;
/*
* private functions
*/
static void* etMemory_FreeList_getHeapMem(etFreeListMemory* self, etUInt16 size) {
etUInt8* obj = NULL;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList", "getHeapListMem")
if (self->current + size < ((etUInt8*)self) + self->base.size)
{
etUInt32 used;
// store size in the first bytes
*((etUInt16*)self->current) = size;
// object pointer at offset
obj = self->current + OBJ_OFFSET;
// shift current
self->current += size;
used = ((etUInt8*)self) + self->base.size - self->current;
if (used > self->base.statistics.maxUsed) {
self->base.statistics.maxUsed = used;
}
}
if (obj==NULL) {
self->base.statistics.nFailingRequests++;
}
ET_MSC_LOGGER_SYNC_EXIT
return obj;
}
static void* etMemory_FreeList_getFreeListMem(etFreeListMemory* self, etUInt16 size) {
etUInt8* mem = NULL;
int asize, slot_offset, slot, slot_size;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList", "getFreeListMem")
asize = (size / etALIGNMENT);
for (slot_offset = 0; slot_offset < self->nslots; slot_offset++) {
slot = (asize + slot_offset) % self->nslots;
slot_size = self->freelists[slot].objsize;
if (slot_size == size) {
if (self->freelists[slot].head != NULL) {
etFreeListObj* obj = self->freelists[slot].head;
self->freelists[slot].head = obj->next;
mem = (void *) obj;
#if DEBUG_FREE_LISTS
--self->freelists[slot].nobjects;
#endif
}
break;
}
else if (slot_size == UNUSED_LIST)
break;
}
ET_MSC_LOGGER_SYNC_EXIT
return mem;
}
static void etMemory_FreeList_putFreeListMem(etFreeListMemory* self, void* obj) {
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList", "putFreeListMem")
{
int asize, slot_offset, slot, slot_size;
etUInt16 size = *((etUInt16*) (((etUInt8*) obj) - OBJ_OFFSET));
asize = (size / etALIGNMENT);
for (slot_offset = 0; slot_offset < self->nslots; slot_offset++) {
slot = (asize + slot_offset) % self->nslots;
slot_size = self->freelists[slot].objsize;
if (slot_size == size) {
/* we insert the object as new head */
((etFreeListObj*)obj)->next = self->freelists[slot].head;
self->freelists[slot].head = (etFreeListObj*)obj;
#if DEBUG_FREE_LISTS
++(self->freelists[slot].nobjects);
#endif
break;
}
else if (slot_size == UNUSED_LIST) {
/* initialize unused list and insert the object as new head */
self->freelists[slot].objsize = size;
((etFreeListObj*)obj)->next = NULL;
self->freelists[slot].head = (etFreeListObj*)obj;
#if DEBUG_FREE_LISTS
self->freelists[slot].nobjects = 1;
#endif
break;
}
}
}
ET_MSC_LOGGER_SYNC_EXIT
}
static void* etMemory_FreeList_alloc(etMemory* heap, etUInt16 size) {
etFreeListMemory* self = (etFreeListMemory*) heap;
void* mem;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList", "alloc")
// rounded required size + space to store the size
size = MEM_CEIL(self->roundUp(size) + OBJ_OFFSET);
DO_LOCK
mem = etMemory_FreeList_getFreeListMem((etFreeListMemory*) heap, size);
if (mem==NULL) {
mem = etMemory_FreeList_getHeapMem((etFreeListMemory*) heap, size);
}
DO_UNLOCK
ET_MSC_LOGGER_SYNC_EXIT
return mem;
}
static void etMemory_FreeList_free(etMemory* heap, void* obj) {
etFreeListMemory* self = (etFreeListMemory*) heap;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList", "free")
DO_LOCK
etMemory_FreeList_putFreeListMem(self, obj);
DO_UNLOCK
ET_MSC_LOGGER_SYNC_EXIT
}
static etUInt16 etMemory_FreeList_identity(etUInt16 size) {
return size;
}
etUInt16 etMemory_FreeList_power2(etUInt16 v) {
/* https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2 */
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v++;
return v;
}
/*
* the public interface
*/
etMemory* etMemory_FreeList_init(void* heap, etUInt32 size, etUInt16 nslots) {
etFreeListMemory* self = (etFreeListMemory*) heap;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList_init", "init")
etUInt32 data_size = MEM_CEIL(sizeof(etFreeListMemory)+(nslots-1)*sizeof(etFreeListInfo));
etUInt32 actual_size = size - data_size;
etMemory* result = NULL;
if (heap!=NULL && size > data_size) {
result = &self->base;
etMemory_init(result, actual_size, etMemory_FreeList_alloc, etMemory_FreeList_free);
self->roundUp = etMemory_FreeList_identity;
self->nslots = nslots;
self->current = ((etUInt8*) self) + data_size;
/* initialize the free lists */
{
int i;
for (i=0; i<self->nslots; ++i)
self->freelists[i].objsize = UNUSED_LIST;
}
}
ET_MSC_LOGGER_SYNC_EXIT
return result;
}
void etMemory_FreeList_setUserRounding(etMemory* mem, roundUpSize* roundup) {
etFreeListMemory* self = (etFreeListMemory*) mem;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList_init", "setUserRounding")
self->roundUp = roundup;
ET_MSC_LOGGER_SYNC_EXIT
}
etUInt32 etMemory_FreeList_getFreeHeapMem(etMemory* mem) {
etFreeListMemory* self = (etFreeListMemory*) mem;
DO_LOCK
etUInt32 result = ((etUInt8*) self) + self->base.size - self->current;
DO_UNLOCK
return result;
}
etUInt16 etMemory_FreeList_freeSlots(etMemory* mem) {
etFreeListMemory* self = (etFreeListMemory*) mem;
etUInt16 free = 0;
int slot;
DO_LOCK
for (slot=0; slot<self->nslots; ++slot)
if (self->freelists[slot].objsize==UNUSED_LIST)
++free;
DO_UNLOCK
return free;
}
etUInt16 etMemory_FreeList_nObjects(etMemory* mem, etUInt16 slot) {
etUInt16 result = 0;
#if DEBUG_FREE_LISTS
etFreeListMemory* self = (etFreeListMemory*) mem;
DO_LOCK
if (slot<self->nslots) {
result = self->freelists[slot].nobjects;
}
DO_UNLOCK
#endif
return result;
}
etUInt16 etMemory_FreeList_sizeObjects(etMemory* mem, etUInt16 slot) {
etFreeListMemory* self = (etFreeListMemory*) mem;
etUInt16 result = 0;
DO_LOCK
if (slot<self->nslots) {
result = self->freelists[slot].objsize - OBJ_OFFSET;
}
DO_UNLOCK
return result;
}
etUInt16 etMemory_FreeList_MgmtDataPerObject() {
return OBJ_OFFSET;
}
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