mirror of https://github.com/lua/lua
138 lines
2.6 KiB
C
138 lines
2.6 KiB
C
/*
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** $Id: $
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** Interface to Memory Manager
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** See Copyright Notice in lua.h
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*/
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#include <stdlib.h>
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#include "lmem.h"
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#include "lua.h"
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int luaM_growaux (void **block, unsigned long nelems, int size,
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char *errormsg, unsigned long limit)
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{
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if (nelems >= limit)
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lua_error(errormsg);
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nelems = (nelems == 0) ? 32 : nelems*2;
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if (nelems > limit)
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nelems = limit;
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*block = luaM_realloc(*block, nelems*size);
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return (int)nelems;
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}
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static unsigned long Mbuffsize = 0;
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static char *Mbuffer = NULL;
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void *luaM_buffer (unsigned long size)
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{
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if (size > Mbuffsize) {
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Mbuffsize = size;
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Mbuffer = luaM_realloc(Mbuffer, Mbuffsize);
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}
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return Mbuffer;
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}
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void luaM_clearbuffer (void)
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{
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Mbuffsize /= 2;
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Mbuffer = luaM_realloc(Mbuffer, Mbuffsize);
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}
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#ifndef DEBUG
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/*
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** generic allocation routine.
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** real ANSI systems do not need some of these tests,
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** since realloc(NULL, s)==malloc(s) and realloc(b, 0)==free(b).
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** But some systems (e.g. Sun OS) are not that ANSI...
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*/
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void *luaM_realloc (void *block, unsigned long size)
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{
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size_t s = (size_t)size;
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if (s != size)
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lua_error("Allocation Error: Block too big");
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if (size == 0) {
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if (block) {
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free(block);
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}
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return NULL;
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}
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block = block ? realloc(block, s) : malloc(s);
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if (block == NULL)
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lua_error(memEM);
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return block;
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}
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#else
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/* DEBUG */
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#include <assert.h>
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#include <string.h>
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#define MARK 55
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static unsigned long numblocks = 0;
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static unsigned long totalmem = 0;
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void luaM_query (void)
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{
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lua_pushnumber(totalmem);
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lua_pushnumber(numblocks);
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}
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static void *checkblock (void *block)
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{
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unsigned long *b = (unsigned long *)block - 1;
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unsigned long size = *b;
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assert(*(((char *)b)+size+sizeof(unsigned long)) == MARK);
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numblocks--;
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totalmem -= size;
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return b;
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}
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void *luaM_realloc (void *block, unsigned long size)
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{
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unsigned long realsize = sizeof(unsigned long)+size+sizeof(char);
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if (realsize != (size_t)realsize)
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lua_error("Allocation Error: Block too big");
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if (size == 0) { /* ANSI doen't need this, but some machines... */
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if (block) {
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memset(block, -1, *((unsigned long *)block-1)); /* erase block */
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block = checkblock(block);
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free(block);
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}
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return NULL;
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}
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if (block) {
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block = checkblock(block);
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block = (unsigned long *)realloc(block, realsize);
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}
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else
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block = (unsigned long *)malloc(realsize);
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if (block == NULL)
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lua_error(memEM);
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totalmem += size;
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numblocks++;
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*(unsigned long *)block = size;
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*(((char *)block)+size+sizeof(unsigned long)) = MARK;
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return (unsigned long *)block+1;
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}
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#endif
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