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/* Copyright (c) 2009 The Khronos Group Inc.
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* Portions copyright (c) 2009-2010 Nokia Corporation and/or its subsidiary(-ies)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and/or associated documentation files (the
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* "Materials"), to deal in the Materials without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Materials, and to
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* permit persons to whom the Materials are furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Materials.
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*
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* THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
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*/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <pthread.h>
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#include "owfmemory.h"
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#include "owfdebug.h"
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#ifdef DEBUG
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#define MAGIK 0x05EAF00D
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#define FENCE1 0xFACED00D
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#define FENCE2 0xFACE50FF
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#define OFFSET(x,y) ((OWFuint32)&(((x*) 0x1000)->y) - 0x1000)
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typedef struct BLOCK_ {
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OWFint magik;
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struct BLOCK_* next;
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const char* file;
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OWFint line;
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OWFuint32 size;
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OWFuint32 nInts;
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OWFint memory[2];
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} BLOCK;
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static void
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OWF_Memory_Shutdown(void);
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static void
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OWF_Memory_LockUnlockManagedBlocks(OWFboolean lock)
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{
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#ifndef DEBUG
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(void) lock;
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#endif
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#ifdef DEBUG
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/* cannot use OWF_MUTEX because it uses managed memory */
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static pthread_mutex_t mem_mutex = PTHREAD_MUTEX_INITIALIZER;
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if (lock)
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{
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pthread_mutex_lock(&mem_mutex);
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}
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else
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{
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pthread_mutex_unlock(&mem_mutex);
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}
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#endif
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}
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static void
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OWF_Memory_LockManagedBlocks()
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{
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OWF_Memory_LockUnlockManagedBlocks(OWF_TRUE);
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}
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static void
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OWF_Memory_UnlockManagedBlocks()
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{
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OWF_Memory_LockUnlockManagedBlocks(OWF_FALSE);
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}
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OWF_API_CALL BLOCK*
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OWF_Memory_GetSetManagedBlocks(BLOCK* b, OWFboolean set)
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{
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#ifdef DEBUG
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static BLOCK* managed_blocks = NULL;
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static OWFboolean initialized = OWF_FALSE;
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if (!initialized) {
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/* add exit handler (leak report) */
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atexit(OWF_Memory_Shutdown);
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initialized = OWF_TRUE;
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}
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if (set)
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{
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managed_blocks = b;
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return b;
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}
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else
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{
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return managed_blocks;
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}
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#else
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if (set)
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{
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b = b; /* dummy code */
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}
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return NULL;
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#endif
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}
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static BLOCK*
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OWF_Memory_GetManagedBlocks()
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{
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return OWF_Memory_GetSetManagedBlocks(NULL, OWF_FALSE);
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}
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static void
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OWF_Memory_SetManagedBlocks(BLOCK* b)
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{
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OWF_Memory_GetSetManagedBlocks(b, OWF_TRUE);
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}
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OWF_API_CALL void*
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OWF_Memory_Alloc(const char* file, OWFint line, OWFuint32 size)
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{
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#define INT_SIZE sizeof(OWFint)
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BLOCK* block = NULL;
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/* size rounded to nearest sizeof(int)*n + 2*sizeof(int) for fences */
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OWFuint32 nInts = 2 + (((size + INT_SIZE-1) &~ (INT_SIZE-1)) >> 2);
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OWFuint32 realSize = nInts * INT_SIZE + sizeof(BLOCK);
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if (realSize > size) /* not int overflow */
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{
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block = (BLOCK*) malloc(realSize);
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}
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if (!block)
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{
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DPRINT(("Couldn't alloc %u bytes\n", size));
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return NULL;
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}
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/* populate block header */
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memset(block, 0, realSize);
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block->magik = MAGIK;
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block->file = file;
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block->line = line;
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block->size = size;
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block->nInts = nInts;
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block->memory[0] = FENCE1;
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block->memory[nInts-1] = FENCE2;
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OWF_Memory_LockManagedBlocks();
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{
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/* insert to list at position 0 */
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block->next = (BLOCK*) OWF_Memory_GetManagedBlocks();
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OWF_Memory_SetManagedBlocks(block);
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}
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OWF_Memory_UnlockManagedBlocks();
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return &block->memory[1];
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}
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OWF_API_CALL void
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OWF_Memory_Free(void* ptr)
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{
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BLOCK* block = NULL;
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if (!ptr) {
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return;
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}
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/* POINTER ARITHMETIC HAZARD */
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block = (BLOCK*) ((OWFuint32) ptr - (OWFuint32) OFFSET(BLOCK,memory[1]));
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if (!block)
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{
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DPRINT(("Sanity check failed. Ptr was zero....\n"));
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return;
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}
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OWF_Memory_LockManagedBlocks();
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{
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BLOCK* temp = NULL;
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BLOCK* prev = NULL;
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OWFboolean stillExists = OWF_FALSE;
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temp = OWF_Memory_GetManagedBlocks();
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while (temp)
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{
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/* the block is on the list? */
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if (temp == block && ptr == &temp->memory[1])
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{
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stillExists = OWF_TRUE;
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break;
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}
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prev = temp;
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temp = temp->next;
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}
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if (stillExists == OWF_TRUE)
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{
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if (MAGIK != temp->magik)
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{
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DPRINT(("Possibly corrupt or invalid block, addr = %p\n", ptr));
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}
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if (block->memory[0] != (OWFint)FENCE1)
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{
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DPRINT(("Block's start fence corrupted, addr = %p\n", ptr));
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}
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if (block->memory[block->nInts-1] != (OWFint)FENCE2)
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{
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DPRINT(("Block's end fence corrupted, addr = %p\n", ptr));
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}
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/* valid block, unlink & free it */
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if (prev)
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{
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prev->next = temp->next;
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}
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else
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{
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OWF_Memory_SetManagedBlocks(temp->next);
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}
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free(block);
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}
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else
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{
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/* possibly already freed, strangled pointer. complain. */
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DPRINT(("Block possibly freed already! (block = %p, addr = %p)\n",
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(void*) block, ptr));
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}
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}
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OWF_Memory_UnlockManagedBlocks();
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}
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OWF_API_CALL void
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OWF_Memory_BlockDump()
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{
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BLOCK* block = OWF_Memory_GetManagedBlocks();
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/* managed blocks locked when this is executed */
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while (block)
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{
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BLOCK* next = (BLOCK*) block->next;
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if (MAGIK == block->magik)
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{
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DPRINT(("Block: %p\nFile: %s(%d)\nSize: %u bytes\n",
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(void*) &block->memory[1],
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block->file,
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block->line,
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block->size));
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}
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else
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{
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DPRINT(("Possibly corrupt or invalid block (addr = %p)\n",
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(void*) block));
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}
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block = next;
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}
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}
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#ifdef DEBUG
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static void
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OWF_Memory_Shutdown()
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{
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BLOCK* block = NULL;
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OWF_Memory_LockManagedBlocks();
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{
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if (OWF_Memory_GetManagedBlocks())
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{
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DPRINT(("======================================================================\n"));DPRINT(("MEMORY LEAK REPORT\n"));DPRINT(("======================================================================\n"));
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OWF_Memory_BlockDump();
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block = OWF_Memory_GetManagedBlocks();
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while (block)
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{
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BLOCK* next = (BLOCK*) block->next;
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if (MAGIK == block->magik)
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{
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free(block);
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}
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block = next;
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}
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OWF_Memory_SetManagedBlocks(NULL);
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}
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}
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OWF_Memory_UnlockManagedBlocks();
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}
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#endif
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#endif
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#ifdef __cplusplus
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}
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#endif
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