package/lua: implement memory limits, scripts can use get_memory_limit() and set_memory_limit() to cap the maximum ram usage
SVN-Revision: 16753master
Jo-Philipp Wich
15 years ago
parent
b8a97ca5c5
commit
03db00a803
@ -0,0 +1,277 @@ |
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--- a/src/lapi.c
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+++ b/src/lapi.c
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@@ -716,14 +716,14 @@
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LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
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StkId t;
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- TValue key;
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lua_lock(L);
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api_checknelems(L, 1);
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t = index2adr(L, idx);
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api_checkvalidindex(L, t);
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- setsvalue(L, &key, luaS_new(L, k));
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- luaV_settable(L, t, &key, L->top - 1);
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- L->top--; /* pop value */
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+ setsvalue2s(L, L->top, luaS_new(L, k));
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+ api_incr_top(L);
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+ luaV_settable(L, t, L->top - 1, L->top - 2);
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+ L->top -= 2; /* pop key and value */
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lua_unlock(L);
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}
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@@ -971,7 +971,12 @@
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break;
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}
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case LUA_GCCOLLECT: {
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- luaC_fullgc(L);
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+ lu_mem old_thres = g->GCthreshold;
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+ if(g->GCthreshold != MAX_LUMEM) {
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+ g->GCthreshold = MAX_LUMEM;
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+ luaC_fullgc(L);
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+ g->GCthreshold = old_thres;
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+ }
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break;
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}
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case LUA_GCCOUNT: {
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--- a/src/ldo.c
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+++ b/src/ldo.c
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@@ -494,6 +494,7 @@
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struct SParser *p = cast(struct SParser *, ud);
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int c = luaZ_lookahead(p->z);
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luaC_checkGC(L);
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+ lua_gc(L, LUA_GCSTOP, 0); /* stop collector during parsing */
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tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z,
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&p->buff, p->name);
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cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L)));
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@@ -502,6 +503,7 @@
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cl->l.upvals[i] = luaF_newupval(L);
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setclvalue(L, L->top, cl);
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incr_top(L);
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+ lua_gc(L, LUA_GCRESTART, 0);
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}
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--- a/src/lgc.c
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+++ b/src/lgc.c
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@@ -437,7 +437,10 @@
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/* check size of buffer */
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if (luaZ_sizebuffer(&g->buff) > LUA_MINBUFFER*2) { /* buffer too big? */
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size_t newsize = luaZ_sizebuffer(&g->buff) / 2;
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- luaZ_resizebuffer(L, &g->buff, newsize);
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+ /* make sure newsize is larger then the buffer's in use size. */
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+ newsize = (luaZ_bufflen(&g->buff) > newsize) ? luaZ_bufflen(&g->buff) : newsize;
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+ if(newsize < luaZ_sizebuffer(&g->buff))
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+ luaZ_resizebuffer(L, &g->buff, newsize);
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}
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}
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--- a/src/lstate.c
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+++ b/src/lstate.c
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@@ -118,7 +118,6 @@
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lua_State *luaE_newthread (lua_State *L) {
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lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
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- luaC_link(L, obj2gco(L1), LUA_TTHREAD);
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preinit_state(L1, G(L));
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stack_init(L1, L); /* init stack */
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setobj2n(L, gt(L1), gt(L)); /* share table of globals */
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@@ -126,6 +125,7 @@
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L1->basehookcount = L->basehookcount;
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L1->hook = L->hook;
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resethookcount(L1);
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+ luaC_link(L, obj2gco(L1), LUA_TTHREAD);
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lua_assert(iswhite(obj2gco(L1)));
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return L1;
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}
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--- a/src/lstring.c
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+++ b/src/lstring.c
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@@ -53,6 +53,9 @@
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stringtable *tb;
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if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
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luaM_toobig(L);
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+ tb = &G(L)->strt;
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+ if ((tb->nuse + 1) > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
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+ luaS_resize(L, tb->size*2); /* too crowded */
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ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
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ts->tsv.len = l;
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ts->tsv.hash = h;
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@@ -61,13 +64,10 @@
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ts->tsv.reserved = 0;
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memcpy(ts+1, str, l*sizeof(char));
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((char *)(ts+1))[l] = '\0'; /* ending 0 */
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- tb = &G(L)->strt;
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h = lmod(h, tb->size);
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ts->tsv.next = tb->hash[h]; /* chain new entry */
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tb->hash[h] = obj2gco(ts);
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tb->nuse++;
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- if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
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- luaS_resize(L, tb->size*2); /* too crowded */
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return ts;
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}
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--- a/src/ltable.c
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+++ b/src/ltable.c
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@@ -371,7 +371,6 @@
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Table *luaH_new (lua_State *L, int narray, int nhash) {
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Table *t = luaM_new(L, Table);
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- luaC_link(L, obj2gco(t), LUA_TTABLE);
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t->metatable = NULL;
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t->flags = cast_byte(~0);
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/* temporary values (kept only if some malloc fails) */
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@@ -381,6 +380,7 @@
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t->node = cast(Node *, dummynode);
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setarrayvector(L, t, narray);
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setnodevector(L, t, nhash);
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+ luaC_link(L, obj2gco(t), LUA_TTABLE);
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return t;
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}
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--- a/src/lvm.c
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+++ b/src/lvm.c
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@@ -375,6 +375,7 @@
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if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
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tl += l;
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}
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+ G(L)->buff.n = tl;
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buffer = luaZ_openspace(L, &G(L)->buff, tl);
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tl = 0;
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for (i=n; i>0; i--) { /* concat all strings */
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@@ -383,6 +384,7 @@
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tl += l;
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}
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setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
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+ luaZ_resetbuffer(&G(L)->buff);
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}
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total -= n-1; /* got `n' strings to create 1 new */
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last -= n-1;
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--- a/src/lua.c
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+++ b/src/lua.c
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@@ -19,6 +19,82 @@
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#include "llimits.h"
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+typedef struct {
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+ char *name;
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+ lua_State *L;
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+ size_t memused;
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+ size_t peak_memused;
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+ size_t max_memused;
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+ int collecting;
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+} script_info_t;
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+
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+
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+static void *script_alloc(void *ud, void *ptr, size_t osize, size_t nsize)
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+{
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+ script_info_t *info=(script_info_t *)ud;
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+ size_t old_size = info->memused;
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+
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+ info->memused -= osize;
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+ if (nsize == 0) {
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+ free(ptr);
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+ return NULL;
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+ }
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+ info->memused += nsize;
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+ if(info->max_memused > 0 && nsize > osize && info->memused >= info->max_memused) {
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+#ifdef LOW_MEM_DEBUG
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+ printf("LOW MEM: 1 osize=%zd, nsize=%zd, used=%zu, peak=%zu, need=%zd\n", osize, nsize,
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+ info->memused, info->peak_memused, (info->memused - info->max_memused));
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+#endif
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+ info->memused = old_size;
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+ /* don't allow a recursive garbage collection call. */
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+ if(info->collecting != 0) {
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+ return NULL;
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+ }
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+ info->collecting = 1;
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+ /* try to free memory by collecting garbage. */
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+ lua_gc(info->L, LUA_GCCOLLECT, 0);
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+ info->collecting = 0;
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+#ifdef LOW_MEM_DEBUG
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+ printf("LOW MEM: 2 used=%zu, peak=%zu\n", info->memused, info->peak_memused);
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+#endif
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+ /* check memory usage again. */
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+ old_size = info->memused;
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+ info->memused -= osize;
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+ info->memused += nsize;
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+ if(info->memused >= info->max_memused) {
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+ info->memused = old_size;
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+#ifdef LOW_MEM_DEBUG
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+ printf("OUT OF MEMORY: memused=%zd, osize=%zd, nsize=%zd\n", info->memused, osize, nsize);
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+#endif
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+ return NULL;
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+ }
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+ }
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+ if(info->memused > info->peak_memused) info->peak_memused = info->memused;
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+ return realloc(ptr, nsize);
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+}
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+
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+static int set_memory_limit(lua_State *L)
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+{
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+ int limit = luaL_checknumber(L, 1);
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+ script_info_t *info;
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+ lua_getallocf(L, (void *)(&info));
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+
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+ if( limit >= 0 )
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+ info->max_memused = limit;
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+
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+ lua_pushnumber(L, limit);
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+ return 1;
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+}
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+
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+static int get_memory_limit(lua_State *L)
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+{
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+ script_info_t *info;
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+ lua_getallocf(L, (void *)(&info));
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+ lua_pushnumber(L, info->max_memused);
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+ return 1;
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+}
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+
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+
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static lua_State *globalL = NULL;
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static const char *progname = LUA_PROGNAME;
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@@ -377,11 +453,28 @@
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int main (int argc, char **argv) {
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int status;
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struct Smain s;
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- lua_State *L = lua_open(); /* create state */
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+ script_info_t *info;
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+
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+ info = (script_info_t *)calloc(1, sizeof(script_info_t));
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+ info->max_memused = 0;
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+ info->collecting = 0;
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+ info->name = argv[0];
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+ info->memused = 0;
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+ info->peak_memused = 0;
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+
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+ lua_State *L = lua_newstate(script_alloc, info);
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+
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if (L == NULL) {
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l_message(argv[0], "cannot create state: not enough memory");
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return EXIT_FAILURE;
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}
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+
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+ info->L = L;
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+
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+ luaL_openlibs(L);
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+ lua_register(L, "set_memory_limit", set_memory_limit);
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+ lua_register(L, "get_memory_limit", get_memory_limit);
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+
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/* Checking 'sizeof(lua_Integer)' cannot be made in preprocessor on all compilers.
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*/
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#ifdef LNUM_INT16
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@@ -396,6 +489,14 @@
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status = lua_cpcall(L, &pmain, &s);
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report(L, status);
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lua_close(L);
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+
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+#ifdef LOW_MEM_DEBUG
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+ printf("%s: memused=%zd, peak_memused=%zd\n", info->name,
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+ info->memused, info->peak_memused);
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+#endif
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+
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+ free(info);
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+
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return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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