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/*
** $Id: lmem.c,v 1.42 2000/12/28 12:55:41 roberto Exp roberto $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include "lua.h"
#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#ifdef LUA_DEBUG
/*
** {======================================================================
** Controlled version for realloc.
** =======================================================================
*/
#include <assert.h>
#include <limits.h>
#include <string.h>
#define basicrealloc(b, os, s) debug_realloc(b, os, s)
#define basicfree(b, s) debug_realloc(b, s, 0)
/* ensures maximum alignment for HEADER */
#define HEADER (sizeof(union L_Umaxalign))
#define MARKSIZE 32
#define MARK 0x55 /* 01010101 (a nice pattern) */
#define blocksize(b) ((size_t *)((char *)(b) - HEADER))
mem_int memdebug_numblocks = 0;
mem_int memdebug_total = 0;
mem_int memdebug_maxmem = 0;
mem_int memdebug_memlimit = LONG_MAX;
static void *checkblock (void *block) {
size_t *b = blocksize(block);
size_t size = *b;
int i;
for (i=0;i<MARKSIZE;i++)
assert(*(((char *)b)+HEADER+size+i) == MARK+i); /* corrupted block? */
return b;
}
static void freeblock (void *block) {
if (block) {
size_t size = *blocksize(block);
block = checkblock(block);
memset(block, -1, size+HEADER+MARKSIZE); /* erase block */
free(block); /* free original block */
memdebug_numblocks--;
memdebug_total -= size;
}
}
static void *debug_realloc (void *block, size_t oldsize, size_t size) {
assert((oldsize == 0) ? block == NULL : oldsize == *blocksize(block));
if (size == 0) {
freeblock(block);
return NULL;
}
else if (memdebug_total+size > memdebug_memlimit)
return NULL; /* to test memory allocation errors */
else {
char *newblock;
int i;
size_t realsize = HEADER+size+MARKSIZE;
if (realsize < size) return NULL; /* overflow! */
newblock = (char *)malloc(realsize); /* alloc a new block */
if (newblock == NULL) return NULL;
if (oldsize > size) oldsize = size;
if (block) {
memcpy(newblock+HEADER, block, oldsize);
freeblock(block); /* erase (and check) old copy */
}
/* initialize new part of the block with something `weird' */
memset(newblock+HEADER+oldsize, -MARK, size-oldsize);
memdebug_total += size;
if (memdebug_total > memdebug_maxmem)
memdebug_maxmem = memdebug_total;
memdebug_numblocks++;
*(size_t *)newblock = size;
for (i=0;i<MARKSIZE;i++)
*(newblock+HEADER+size+i) = (char)(MARK+i);
return newblock+HEADER;
}
}
/* }====================================================================== */
#else
/* no debug */
/*
** Real ISO (ANSI) systems do not need these tests;
** but some systems (Sun OS) are not that ISO...
*/
#ifdef OLD_ANSI
#define basicrealloc(b,os,s) ((b) == NULL ? malloc(s) : realloc(b, s))
#define basicfree(b,s) if (b) free(b)
#else
#define basicrealloc(b,os,s) realloc(b,s)
#define basicfree(b,s) free(b)
#endif
#endif
void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems,
int limit, const char *errormsg) {
void *newblock;
int newsize = (*size)*2;
if (newsize < MINPOWER2)
newsize = MINPOWER2; /* minimum size */
else if (*size >= limit/2) { /* cannot double it? */
if (*size < limit - MINPOWER2) /* try something smaller... */
newsize = limit; /* still have at least MINPOWER2 free places */
else lua_error(L, errormsg);
}
newblock = luaM_realloc(L, block, (luint32)(*size)*(luint32)size_elems,
(luint32)newsize*(luint32)size_elems);
*size = newsize; /* update only when everything else is OK */
return newblock;
}
/*
** generic allocation routine.
*/
void *luaM_realloc (lua_State *L, void *block, luint32 oldsize, luint32 size) {
if (size == 0) {
basicfree(block, oldsize); /* block may be NULL; that is OK for free */
block = NULL;
}
else if (size >= MAX_SIZET)
lua_error(L, "memory allocation error: block too big");
else {
block = basicrealloc(block, oldsize, size);
if (block == NULL) {
if (L)
luaD_breakrun(L, LUA_ERRMEM); /* break run without error message */
else return NULL; /* error before creating state! */
}
}
if (L && G(L)) {
G(L)->nblocks -= oldsize;
G(L)->nblocks += size;
}
return block;
}
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