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/*
** mem.c
** TecCGraf - PUC-Rio
*/
char *rcs_luamem = "$Id: luamem.c,v 1.15 1997/03/31 14:17:09 roberto Exp roberto $";
#include <stdlib.h>
#include "luamem.h"
#include "lua.h"
#define DEBUG 0
#if !DEBUG
void luaI_free (void *block)
{
if (block)
{
*((char *)block) = -1; /* to catch errors */
free(block);
}
}
void *luaI_realloc (void *oldblock, unsigned long size)
{
void *block;
size_t s = (size_t)size;
if (s != size)
lua_error("Allocation Error: Block too big");
block = oldblock ? realloc(oldblock, s) : malloc(s);
if (block == NULL)
lua_error(memEM);
return block;
}
int luaI_growvector (void **block, unsigned long nelems, int size,
char *errormsg, unsigned long limit)
{
if (nelems >= limit)
lua_error(errormsg);
nelems = (nelems == 0) ? 20 : nelems*2;
if (nelems > limit)
nelems = limit;
*block = luaI_realloc(*block, nelems*size);
return (int)nelems;
}
void* luaI_buffer (unsigned long size)
{
static unsigned long buffsize = 0;
static char* buffer = NULL;
if (size > buffsize)
buffer = luaI_realloc(buffer, buffsize=size);
return buffer;
}
#else
/* DEBUG */
#include <stdio.h>
# define assert(ex) {if (!(ex)){(void)fprintf(stderr, \
"Assertion failed: file \"%s\", line %d\n", __FILE__, __LINE__);exit(1);}}
#define MARK 55
static unsigned long numblocks = 0;
static unsigned long totalmem = 0;
static void message (void)
{
#define inrange(x,y) ((x) < (((y)*3)/2) && (x) > (((y)*2)/3))
static int count = 0;
static unsigned long lastnumblocks = 0;
static unsigned long lasttotalmem = 0;
if (!inrange(numblocks, lastnumblocks) || !inrange(totalmem, lasttotalmem)
|| count++ >= 5000)
{
fprintf(stderr,"blocks = %lu mem = %luK\n", numblocks, totalmem/1000);
count = 0;
lastnumblocks = numblocks;
lasttotalmem = totalmem;
}
}
void luaI_free (void *block)
{
if (block)
{
unsigned long *b = (unsigned long *)block - 1;
unsigned long size = *b;
assert(*(((char *)b)+size+sizeof(unsigned long)) == MARK);
numblocks--;
totalmem -= size;
free(b);
message();
}
}
void *luaI_realloc (void *oldblock, unsigned long size)
{
unsigned long *block;
unsigned long realsize = sizeof(unsigned long)+size+sizeof(char);
if (realsize != (size_t)realsize)
lua_error("Allocation Error: Block too big");
if (oldblock)
{
unsigned long *b = (unsigned long *)oldblock - 1;
unsigned long oldsize = *b;
assert(*(((char *)b)+oldsize+sizeof(unsigned long)) == MARK);
totalmem -= oldsize;
numblocks--;
block = (unsigned long *)realloc(b, realsize);
}
else
block = (unsigned long *)malloc(realsize);
if (block == NULL)
lua_error("not enough memory");
totalmem += size;
numblocks++;
*block = size;
*(((char *)block)+size+sizeof(unsigned long)) = MARK;
message();
return block+1;
}
int luaI_growvector (void **block, unsigned long nelems, int size,
char *errormsg, unsigned long limit)
{
if (nelems >= limit)
lua_error(errormsg);
nelems = (nelems == 0) ? 20 : nelems*2;
if (nelems > limit)
nelems = limit;
*block = luaI_realloc(*block, nelems*size);
return (int)nelems;
}
void* luaI_buffer (unsigned long size)
{
static unsigned long buffsize = 0;
static char* buffer = NULL;
if (size > buffsize)
buffer = luaI_realloc(buffer, buffsize=size);
return buffer;
}
#endif
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