mirror of https://github.com/lua/lua
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/*
|
|
** $Id: lmem.c,v 1.21 1999/11/29 16:38:48 roberto Exp roberto $
|
|
** Interface to Memory Manager
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include <stdlib.h>
|
|
|
|
#define LUA_REENTRANT
|
|
|
|
#include "lmem.h"
|
|
#include "lobject.h"
|
|
#include "lstate.h"
|
|
#include "lua.h"
|
|
|
|
|
|
/*
|
|
** real ANSI systems do not need these tests;
|
|
** but some systems (Sun OS) are not that ANSI...
|
|
*/
|
|
#ifdef OLD_ANSI
|
|
#define realloc(b,s) ((b) == NULL ? malloc(s) : (realloc)(b, s))
|
|
#define free(b) if (b) (free)(b)
|
|
#endif
|
|
|
|
|
|
|
|
|
|
void *luaM_growaux (lua_State *L, void *block, unsigned long nelems,
|
|
int inc, int size, const char *errormsg, unsigned long limit) {
|
|
unsigned long newn = nelems+inc;
|
|
if (newn >= limit) lua_error(L, errormsg);
|
|
if ((newn ^ nelems) <= nelems || /* still the same power-of-2 limit? */
|
|
(nelems > 0 && newn < MINPOWER2)) /* or block already is MINPOWER2? */
|
|
return block; /* do not need to reallocate */
|
|
else /* it crossed a power-of-2 boundary; grow to next power */
|
|
return luaM_realloc(L, block, luaO_power2(newn)*size);
|
|
}
|
|
|
|
|
|
#ifndef DEBUG
|
|
|
|
/*
|
|
** generic allocation routine.
|
|
*/
|
|
void *luaM_realloc (lua_State *L, void *block, unsigned long size) {
|
|
size_t s = (size_t)size;
|
|
if (s != size)
|
|
lua_error(L, "memory allocation error: block too big");
|
|
if (size == 0) {
|
|
free(block); /* block may be NULL, that is OK for free */
|
|
return NULL;
|
|
}
|
|
block = realloc(block, s);
|
|
if (block == NULL)
|
|
lua_error(L, memEM);
|
|
return block;
|
|
}
|
|
|
|
|
|
|
|
#else
|
|
/* DEBUG */
|
|
|
|
#include <string.h>
|
|
|
|
|
|
#define HEADER (sizeof(double))
|
|
#define MARKSIZE 16
|
|
|
|
#define MARK 55
|
|
|
|
|
|
#define blocksize(b) ((unsigned long *)((char *)(b) - HEADER))
|
|
|
|
unsigned long numblocks = 0;
|
|
unsigned long totalmem = 0;
|
|
|
|
|
|
static void *checkblock (void *block) {
|
|
unsigned long *b = blocksize(block);
|
|
unsigned long size = *b;
|
|
int i;
|
|
for (i=0;i<MARKSIZE;i++)
|
|
LUA_ASSERT(L, *(((char *)b)+HEADER+size+i) == MARK+i, "corrupted block");
|
|
numblocks--;
|
|
totalmem -= size;
|
|
return b;
|
|
}
|
|
|
|
|
|
static void freeblock (void *block) {
|
|
if (block) {
|
|
memset(block, -1, *blocksize(block)); /* erase block */
|
|
block = checkblock(block);
|
|
free(block);
|
|
}
|
|
}
|
|
|
|
|
|
void *luaM_realloc (lua_State *L, void *block, unsigned long size) {
|
|
unsigned long realsize = HEADER+size+MARKSIZE;
|
|
if (realsize != (size_t)realsize)
|
|
lua_error(L, "memory allocation error: block too big");
|
|
if (size == 0) {
|
|
freeblock(block);
|
|
return NULL;
|
|
}
|
|
else {
|
|
char *newblock = malloc(realsize);
|
|
int i;
|
|
if (block) {
|
|
unsigned long oldsize = *blocksize(block);
|
|
if (oldsize > size) oldsize = size;
|
|
memcpy(newblock+HEADER, block, oldsize);
|
|
freeblock(block); /* erase (and check) old copy */
|
|
}
|
|
if (newblock == NULL)
|
|
lua_error(L, memEM);
|
|
totalmem += size;
|
|
numblocks++;
|
|
*(unsigned long *)newblock = size;
|
|
for (i=0;i<MARKSIZE;i++)
|
|
*(newblock+HEADER+size+i) = (char)(MARK+i);
|
|
return newblock+HEADER;
|
|
}
|
|
}
|
|
|
|
|
|
#endif
|