0,0 → 1,115 |
/* |
** $Id: lmem.c,v 1.83 2011/11/30 12:42:49 roberto Exp $ |
** Interface to Memory Manager |
** See Copyright Notice in lua.h |
*/ |
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#include <stddef.h> |
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#define lmem_c |
#define LUA_CORE |
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#include "lua.h" |
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#include "ldebug.h" |
#include "ldo.h" |
#include "lgc.h" |
#include "lmem.h" |
#include "lobject.h" |
#include "lstate.h" |
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/* |
** About the realloc function: |
** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize); |
** (`osize' is the old size, `nsize' is the new size) |
** |
** * frealloc(ud, NULL, x, s) creates a new block of size `s' (no |
** matter 'x'). |
** |
** * frealloc(ud, p, x, 0) frees the block `p' |
** (in this specific case, frealloc must return NULL); |
** particularly, frealloc(ud, NULL, 0, 0) does nothing |
** (which is equivalent to free(NULL) in ANSI C) |
** |
** frealloc returns NULL if it cannot create or reallocate the area |
** (any reallocation to an equal or smaller size cannot fail!) |
*/ |
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#define MINSIZEARRAY 4 |
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void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems, |
int limit, const char *what) { |
void *newblock; |
int newsize; |
if (*size >= limit/2) { /* cannot double it? */ |
if (*size >= limit) /* cannot grow even a little? */ |
luaG_runerror(L, "too many %s (limit is %d)", what, limit); |
newsize = limit; /* still have at least one free place */ |
} |
else { |
newsize = (*size)*2; |
if (newsize < MINSIZEARRAY) |
newsize = MINSIZEARRAY; /* minimum size */ |
} |
newblock = luaM_reallocv(L, block, *size, newsize, size_elems); |
*size = newsize; /* update only when everything else is OK */ |
return newblock; |
} |
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l_noret luaM_toobig (lua_State *L) { |
luaG_runerror(L, "memory allocation error: block too big"); |
} |
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/* |
** generic allocation routine. |
*/ |
void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) { |
void *newblock; |
global_State *g = G(L); |
size_t realosize = (block) ? osize : 0; |
lua_assert((realosize == 0) == (block == NULL)); |
#if defined(HARDMEMTESTS) |
if (nsize > realosize && g->gcrunning) |
luaC_fullgc(L, 1); /* force a GC whenever possible */ |
#endif |
newblock = (*g->frealloc)(g->ud, block, osize, nsize); |
if (newblock == NULL && nsize > 0) { |
api_check(L, nsize > realosize, |
"realloc cannot fail when shrinking a block"); |
if (g->gcrunning) { |
luaC_fullgc(L, 1); /* try to free some memory... */ |
newblock = (*g->frealloc)(g->ud, block, osize, nsize); /* try again */ |
} |
if (newblock == NULL) |
luaD_throw(L, LUA_ERRMEM); |
} |
lua_assert((nsize == 0) == (newblock == NULL)); |
g->GCdebt = (g->GCdebt + nsize) - realosize; |
#if defined(TRACEMEM) |
{ /* auxiliary patch to monitor garbage collection. |
** To plot, gnuplot with following command: |
** plot TRACEMEM using 1:2 with lines, TRACEMEM using 1:3 with lines |
*/ |
static unsigned long total = 0; /* our "time" */ |
static FILE *f = NULL; /* output file */ |
total++; /* "time" always grows */ |
if ((total % 200) == 0) { |
if (f == NULL) f = fopen(TRACEMEM, "w"); |
fprintf(f, "%lu %u %d %d\n", total, |
gettotalbytes(g), g->GCdebt, g->gcstate * 10000); |
} |
} |
#endif |
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return newblock; |
} |
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