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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5205 | clevermous | 1 | /* |
| 2 | ** $Id: lmem.c,v 1.83 2011/11/30 12:42:49 roberto Exp $ |
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| 3 | ** Interface to Memory Manager |
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| 4 | ** See Copyright Notice in lua.h |
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| 5 | */ |
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| 6 | |||
| 7 | |||
| 8 | #include |
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| 9 | |||
| 10 | #define lmem_c |
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| 11 | #define LUA_CORE |
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| 12 | |||
| 13 | #include "lua.h" |
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| 14 | |||
| 15 | #include "ldebug.h" |
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| 16 | #include "ldo.h" |
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| 17 | #include "lgc.h" |
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| 18 | #include "lmem.h" |
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| 19 | #include "lobject.h" |
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| 20 | #include "lstate.h" |
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| 21 | |||
| 22 | |||
| 23 | |||
| 24 | /* |
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| 25 | ** About the realloc function: |
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| 26 | ** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize); |
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| 27 | ** (`osize' is the old size, `nsize' is the new size) |
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| 28 | ** |
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| 29 | ** * frealloc(ud, NULL, x, s) creates a new block of size `s' (no |
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| 30 | ** matter 'x'). |
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| 31 | ** |
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| 32 | ** * frealloc(ud, p, x, 0) frees the block `p' |
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| 33 | ** (in this specific case, frealloc must return NULL); |
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| 34 | ** particularly, frealloc(ud, NULL, 0, 0) does nothing |
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| 35 | ** (which is equivalent to free(NULL) in ANSI C) |
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| 36 | ** |
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| 37 | ** frealloc returns NULL if it cannot create or reallocate the area |
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| 38 | ** (any reallocation to an equal or smaller size cannot fail!) |
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| 39 | */ |
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| 40 | |||
| 41 | |||
| 42 | |||
| 43 | #define MINSIZEARRAY 4 |
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| 44 | |||
| 45 | |||
| 46 | void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems, |
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| 47 | int limit, const char *what) { |
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| 48 | void *newblock; |
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| 49 | int newsize; |
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| 50 | if (*size >= limit/2) { /* cannot double it? */ |
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| 51 | if (*size >= limit) /* cannot grow even a little? */ |
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| 52 | luaG_runerror(L, "too many %s (limit is %d)", what, limit); |
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| 53 | newsize = limit; /* still have at least one free place */ |
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| 54 | } |
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| 55 | else { |
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| 56 | newsize = (*size)*2; |
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| 57 | if (newsize < MINSIZEARRAY) |
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| 58 | newsize = MINSIZEARRAY; /* minimum size */ |
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| 59 | } |
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| 60 | newblock = luaM_reallocv(L, block, *size, newsize, size_elems); |
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| 61 | *size = newsize; /* update only when everything else is OK */ |
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| 62 | return newblock; |
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| 63 | } |
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| 64 | |||
| 65 | |||
| 66 | l_noret luaM_toobig (lua_State *L) { |
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| 67 | luaG_runerror(L, "memory allocation error: block too big"); |
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| 68 | } |
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| 69 | |||
| 70 | |||
| 71 | |||
| 72 | /* |
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| 73 | ** generic allocation routine. |
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| 74 | */ |
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| 75 | void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) { |
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| 76 | void *newblock; |
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| 77 | global_State *g = G(L); |
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| 78 | size_t realosize = (block) ? osize : 0; |
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| 79 | lua_assert((realosize == 0) == (block == NULL)); |
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| 80 | #if defined(HARDMEMTESTS) |
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| 81 | if (nsize > realosize && g->gcrunning) |
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| 82 | luaC_fullgc(L, 1); /* force a GC whenever possible */ |
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| 83 | #endif |
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| 84 | newblock = (*g->frealloc)(g->ud, block, osize, nsize); |
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| 85 | if (newblock == NULL && nsize > 0) { |
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| 86 | api_check(L, nsize > realosize, |
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| 87 | "realloc cannot fail when shrinking a block"); |
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| 88 | if (g->gcrunning) { |
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| 89 | luaC_fullgc(L, 1); /* try to free some memory... */ |
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| 90 | newblock = (*g->frealloc)(g->ud, block, osize, nsize); /* try again */ |
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| 91 | } |
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| 92 | if (newblock == NULL) |
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| 93 | luaD_throw(L, LUA_ERRMEM); |
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| 94 | } |
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| 95 | lua_assert((nsize == 0) == (newblock == NULL)); |
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| 96 | g->GCdebt = (g->GCdebt + nsize) - realosize; |
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| 97 | #if defined(TRACEMEM) |
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| 98 | { /* auxiliary patch to monitor garbage collection. |
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| 99 | ** To plot, gnuplot with following command: |
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| 100 | ** plot TRACEMEM using 1:2 with lines, TRACEMEM using 1:3 with lines |
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| 101 | */ |
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| 102 | static unsigned long total = 0; /* our "time" */ |
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| 103 | static FILE *f = NULL; /* output file */ |
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| 104 | total++; /* "time" always grows */ |
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| 105 | if ((total % 200) == 0) { |
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| 106 | if (f == NULL) f = fopen(TRACEMEM, "w"); |
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| 107 | fprintf(f, "%lu %u %d %d\n", total, |
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| 108 | gettotalbytes(g), g->GCdebt, g->gcstate * 10000); |
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| 109 | } |
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| 110 | } |
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| 111 | #endif |
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| 112 | |||
| 113 | return newblock; |
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| 114 | } |
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| 115 |