root/src/lua/src/lmem.c

Revision 22d1941d0ca5ba7027cdfa51ce34bd1d8fb1931e, 2.1 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 10 years ago)

take the version out... it is what it is

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Line 
1 /*
2 ** $Id: lmem.c,v 1.70.1.1 2007/12/27 13:02:25 roberto Exp $
3 ** Interface to Memory Manager
4 ** See Copyright Notice in lua.h
5 */
6
7
8 #include <stddef.h>
9
10 #define lmem_c
11 #define LUA_CORE
12
13 #include "lua.h"
14
15 #include "ldebug.h"
16 #include "ldo.h"
17 #include "lmem.h"
18 #include "lobject.h"
19 #include "lstate.h"
20
21
22
23 /*
24 ** About the realloc function:
25 ** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize);
26 ** (`osize' is the old size, `nsize' is the new size)
27 **
28 ** Lua ensures that (ptr == NULL) iff (osize == 0).
29 **
30 ** * frealloc(ud, NULL, 0, x) creates a new block of size `x'
31 **
32 ** * frealloc(ud, p, x, 0) frees the block `p'
33 ** (in this specific case, frealloc must return NULL).
34 ** particularly, frealloc(ud, NULL, 0, 0) does nothing
35 ** (which is equivalent to free(NULL) in ANSI C)
36 **
37 ** frealloc returns NULL if it cannot create or reallocate the area
38 ** (any reallocation to an equal or smaller size cannot fail!)
39 */
40
41
42
43 #define MINSIZEARRAY    4
44
45
46 void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems,
47                      int limit, const char *errormsg) {
48   void *newblock;
49   int newsize;
50   if (*size >= limit/2) {  /* cannot double it? */
51     if (*size >= limit)  /* cannot grow even a little? */
52       luaG_runerror(L, errormsg);
53     newsize = limit;  /* still have at least one free place */
54   }
55   else {
56     newsize = (*size)*2;
57     if (newsize < MINSIZEARRAY)
58       newsize = MINSIZEARRAY;  /* minimum size */
59   }
60   newblock = luaM_reallocv(L, block, *size, newsize, size_elems);
61   *size = newsize;  /* update only when everything else is OK */
62   return newblock;
63 }
64
65
66 void *luaM_toobig (lua_State *L) {
67   luaG_runerror(L, "memory allocation error: block too big");
68   return NULL;  /* to avoid warnings */
69 }
70
71
72
73 /*
74 ** generic allocation routine.
75 */
76 void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
77   global_State *g = G(L);
78   lua_assert((osize == 0) == (block == NULL));
79   block = (*g->frealloc)(g->ud, block, osize, nsize);
80   if (block == NULL && nsize > 0)
81     luaD_throw(L, LUA_ERRMEM);
82   lua_assert((nsize == 0) == (block == NULL));
83   g->totalbytes = (g->totalbytes - osize) + nsize;
84   return block;
85 }
86
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