javascript-database/js_malloc.c at master · malbrain/javascript-database · GitHub

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#include<errno.h>

#ifndef__APPLE__
#include<malloc.h>
#endif

#include"js.h"
#include"js_malloc.h"
#include"database/db.h"
#include"database/db_arena.h"
#include"database/db_map.h"

externboolmallocDebug;

// allocate reference counted object

void*js_alloc(uint32_tsize, boolzeroit) {
rawobj_t*mem;
DbAddraddr;

mem=db_malloc(size+sizeof(rawobj_t), mallocDebug ? false : zeroit);

if (mallocDebug) {
addr=db_memAddr(mem);

if (addr.bits&&addr.bits!=0xdeadbeef) {
fprintf(stderr, "js_alloc: memory address already in use\n");
exit(0);
 }
 }

mem->weakCnt[0] =0;
mem->refCnt[0] =0;
returnmem+1;
}

//	free javascript object

voidjs_free(void*obj) {
rawobj_t*mem=obj;

db_free(mem-1);
}

uint32_tjs_size (void*obj) {
rawobj_t*raw=obj;

returndb_memSize(raw-1) -sizeof(rawobj_t);
}

void*js_realloc(void*old, uint32_t*size, boolzeroit) {
rawobj_t*raw=old, *mem;
uint32_toldSize;
DbAddraddr;

addr=db_memAddr(raw-1);

// is the new size within the same power of two?

if (mallocDebug)
if (addr.bits==0xdeadbeef)
fprintf (stderr, "js_realloc: memory already free!\n");

// calc user's size

oldSize=db_rawSize(addr) -sizeof(rawobj_t);

//	see if it is still witin the allocation

if (oldSize >= *size) {
*size=oldSize;
returnold;
	}

if ((mem=js_alloc(*size, zeroit)))
*size=db_memSize(mem) -sizeof(rawobj_t);
else {
fprintf (stderr, "js_realloc: out of memory!\n");
exit(1);
	}

// copy contents and release old allocation

memcpy(mem, raw, oldSize);

if (zeroit)
memset((char*)mem+oldSize, 0, *size-oldSize);

// copy reference counts

*mem[-1].weakCnt=*raw[-1].weakCnt;
*mem[-1].refCnt=*raw[-1].refCnt;

db_memFree (addr);
returnmem;
}