1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
** $Id: lmem.c,v 1.3 2001/11/26 23:00:24 darkgod Exp $
** 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 realloc(b, s) debug_realloc(b, s)
#define malloc(b) debug_realloc(NULL, b)
#define free(b) debug_realloc(b, 0)
/* ensures maximum alignment for HEADER */
#define HEADER (sizeof(union L_Umaxalign))
#define MARKSIZE 16
#define MARK 0x55 /* 01010101 (a nice pattern) */
#define blocksize(b) ((unsigned long *)((char *)(b) - HEADER))
unsigned long memdebug_numblocks = 0;
unsigned long memdebug_total = 0;
unsigned long memdebug_maxmem = 0;
unsigned long memdebug_memlimit = LONG_MAX;
static void *checkblock (void *block) {
unsigned long *b = blocksize(block);
unsigned long size = *b;
int i;
for (i=0;i<MARKSIZE;i++)
assert(*(((char *)b)+HEADER+size+i) == MARK+i); /* corrupted block? */
memdebug_numblocks--;
memdebug_total -= size;
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 */
}
}
static void *debug_realloc (void *block, size_t size) {
if (size == 0) {
freeblock(block);
return NULL;
}
else if (memdebug_total+size > memdebug_memlimit)
return NULL; /* to test memory allocation errors */
else {
size_t realsize = HEADER+size+MARKSIZE;
char *newblock = (char *)(malloc)(realsize); /* alloc a new block */
int i;
if (realsize < size) return NULL; /* overflow! */
if (newblock == NULL) return NULL;
if (block) {
size_t oldsize = *blocksize(block);
if (oldsize > size) oldsize = size;
memcpy(newblock+HEADER, block, oldsize);
freeblock(block); /* erase (and check) old copy */
}
memdebug_total += size;
if (memdebug_total > memdebug_maxmem) memdebug_maxmem = memdebug_total;
memdebug_numblocks++;
*(unsigned long *)newblock = size;
for (i=0;i<MARKSIZE;i++)
*(newblock+HEADER+size+i) = (char)(MARK+i);
return newblock+HEADER;
}
}
/* }====================================================================== */
#endif
/*
** Real ISO (ANSI) systems do not need these tests;
** but some systems (Sun OS) are not that ISO...
*/
#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, size_t nelems,
int inc, size_t size, const char *errormsg, size_t limit) {
size_t newn = nelems+inc;
if (nelems >= limit-inc) 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);
}
/*
** generic allocation routine.
*/
void *luaM_realloc (lua_State *L, void *block, lint32 size) {
if (size == 0) {
free(block); /* block may be NULL; that is OK for free */
return NULL;
}
else if (size >= MAX_SIZET)
lua_error(L, "memory allocation error: block too big");
block = realloc(block, size);
if (block == NULL) {
if (L)
luaD_breakrun(L, LUA_ERRMEM); /* break run without error message */
else return NULL; /* error before creating state! */
}
return block;
}
|
