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openwrt-owl
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openwrt-owl/package/lua/patches/040-memory-limits.patch

290 lines
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--- a/src/lapi.c
+++ b/src/lapi.c
@@ -716,14 +716,14 @@
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
StkId t;
- TValue key;
lua_lock(L);
api_checknelems(L, 1);
t = index2adr(L, idx);
api_checkvalidindex(L, t);
- setsvalue(L, &key, luaS_new(L, k));
- luaV_settable(L, t, &key, L->top - 1);
- L->top--; /* pop value */
+ setsvalue2s(L, L->top, luaS_new(L, k));
+ api_incr_top(L);
+ luaV_settable(L, t, L->top - 1, L->top - 2);
+ L->top -= 2; /* pop key and value */
lua_unlock(L);
}
@@ -971,7 +971,12 @@
break;
}
case LUA_GCCOLLECT: {
- luaC_fullgc(L);
+ lu_mem old_thres = g->GCthreshold;
+ if(g->GCthreshold != MAX_LUMEM) {
+ g->GCthreshold = MAX_LUMEM;
+ luaC_fullgc(L);
+ g->GCthreshold = old_thres;
+ }
break;
}
case LUA_GCCOUNT: {
--- a/src/ldo.c
+++ b/src/ldo.c
@@ -494,6 +494,7 @@
struct SParser *p = cast(struct SParser *, ud);
int c = luaZ_lookahead(p->z);
luaC_checkGC(L);
+ lua_gc(L, LUA_GCSTOP, 0); /* stop collector during parsing */
tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z,
&p->buff, p->name);
cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L)));
@@ -502,6 +503,7 @@
cl->l.upvals[i] = luaF_newupval(L);
setclvalue(L, L->top, cl);
incr_top(L);
+ lua_gc(L, LUA_GCRESTART, 0);
}
--- a/src/lgc.c
+++ b/src/lgc.c
@@ -437,7 +437,10 @@
/* check size of buffer */
if (luaZ_sizebuffer(&g->buff) > LUA_MINBUFFER*2) { /* buffer too big? */
size_t newsize = luaZ_sizebuffer(&g->buff) / 2;
- luaZ_resizebuffer(L, &g->buff, newsize);
+ /* make sure newsize is larger then the buffer's in use size. */
+ newsize = (luaZ_bufflen(&g->buff) > newsize) ? luaZ_bufflen(&g->buff) : newsize;
+ if(newsize < luaZ_sizebuffer(&g->buff))
+ luaZ_resizebuffer(L, &g->buff, newsize);
}
}
--- a/src/lstate.c
+++ b/src/lstate.c
@@ -118,7 +118,6 @@
lua_State *luaE_newthread (lua_State *L) {
lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
- luaC_link(L, obj2gco(L1), LUA_TTHREAD);
preinit_state(L1, G(L));
stack_init(L1, L); /* init stack */
setobj2n(L, gt(L1), gt(L)); /* share table of globals */
@@ -126,6 +125,7 @@
L1->basehookcount = L->basehookcount;
L1->hook = L->hook;
resethookcount(L1);
+ luaC_link(L, obj2gco(L1), LUA_TTHREAD);
lua_assert(iswhite(obj2gco(L1)));
return L1;
}
--- a/src/lstring.c
+++ b/src/lstring.c
@@ -53,6 +53,9 @@
stringtable *tb;
if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
luaM_toobig(L);
+ tb = &G(L)->strt;
+ if ((tb->nuse + 1) > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
+ luaS_resize(L, tb->size*2); /* too crowded */
ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
ts->tsv.len = l;
ts->tsv.hash = h;
@@ -61,13 +64,10 @@
ts->tsv.reserved = 0;
memcpy(ts+1, str, l*sizeof(char));
((char *)(ts+1))[l] = '\0'; /* ending 0 */
- tb = &G(L)->strt;
h = lmod(h, tb->size);
ts->tsv.next = tb->hash[h]; /* chain new entry */
tb->hash[h] = obj2gco(ts);
tb->nuse++;
- if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
- luaS_resize(L, tb->size*2); /* too crowded */
return ts;
}
--- a/src/ltable.c
+++ b/src/ltable.c
@@ -371,7 +371,6 @@
Table *luaH_new (lua_State *L, int narray, int nhash) {
Table *t = luaM_new(L, Table);
- luaC_link(L, obj2gco(t), LUA_TTABLE);
t->metatable = NULL;
t->flags = cast_byte(~0);
/* temporary values (kept only if some malloc fails) */
@@ -381,6 +380,7 @@
t->node = cast(Node *, dummynode);
setarrayvector(L, t, narray);
setnodevector(L, t, nhash);
+ luaC_link(L, obj2gco(t), LUA_TTABLE);
return t;
}
--- a/src/lvm.c
+++ b/src/lvm.c
@@ -375,6 +375,7 @@
if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
tl += l;
}
+ G(L)->buff.n = tl;
buffer = luaZ_openspace(L, &G(L)->buff, tl);
tl = 0;
for (i=n; i>0; i--) { /* concat all strings */
@@ -383,6 +384,7 @@
tl += l;
}
setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
+ luaZ_resetbuffer(&G(L)->buff);
}
total -= n-1; /* got `n' strings to create 1 new */
last -= n-1;
--- a/src/lua.c
+++ b/src/lua.c
@@ -19,6 +19,94 @@
#include "llimits.h"
+typedef struct {
+ char *name;
+ lua_State *L;
+ size_t memused;
+ size_t peak_memused;
+ size_t gc_memused;
+ size_t max_memused;
+ int collecting;
+} script_info_t;
+
+
+static void *script_alloc(void *ud, void *ptr, size_t osize, size_t nsize)
+{
+ script_info_t *info=(script_info_t *)ud;
+ size_t old_size = info->memused;
+
+ info->memused -= osize;
+ if (nsize == 0) {
+ free(ptr);
+ return NULL;
+ }
+ info->memused += nsize;
+ if(info->max_memused > 0 && nsize > osize &&
+ (info->memused >= info->max_memused || info->memused >= info->gc_memused)) {
+#ifdef LOW_MEM_DEBUG
+ printf("LOW MEM: 1 osize=%zd, nsize=%zd, used=%zu, peak=%zu, need=%zd\n", osize, nsize,
+ info->memused, info->peak_memused, (info->memused - info->max_memused));
+#endif
+ info->memused = old_size;
+ /* don't allow a recursive garbage collection call. */
+ if(info->collecting != 0) {
+ return NULL;
+ }
+ info->collecting = 1;
+ /* try to free memory by collecting garbage. */
+ lua_gc(info->L, LUA_GCCOLLECT, 0);
+ info->collecting = 0;
+#ifdef LOW_MEM_DEBUG
+ printf("LOW MEM: 2 used=%zu, peak=%zu\n", info->memused, info->peak_memused);
+#endif
+ /* check memory usage again. */
+ old_size = info->memused;
+ info->memused -= osize;
+ info->memused += nsize;
+ if(info->memused >= info->max_memused) {
+ info->memused = old_size;
+#ifdef LOW_MEM_DEBUG
+ printf("OUT OF MEMORY: memused=%zd, osize=%zd, nsize=%zd\n", info->memused, osize, nsize);
+#endif
+ return NULL;
+ }
+ }
+ if(info->memused > info->peak_memused) info->peak_memused = info->memused;
+ return realloc(ptr, nsize);
+}
+
+static int set_memory_limit(lua_State *L)
+{
+ int hardlimit = luaL_checknumber(L, 1);
+ int softlimit = luaL_optnumber(L, 2, 0);
+
+ script_info_t *info;
+ lua_getallocf(L, (void *)(&info));
+
+ if( hardlimit >= 0 )
+ {
+ if( softlimit <= 0 )
+ softlimit = (int)((float)hardlimit * 0.75);
+
+ info->max_memused = hardlimit;
+ info->gc_memused = softlimit;
+ }
+
+ lua_pushnumber(L, hardlimit);
+ lua_pushnumber(L, softlimit);
+ return 2;
+}
+
+static int get_memory_limit(lua_State *L)
+{
+ script_info_t *info;
+ lua_getallocf(L, (void *)(&info));
+ lua_pushnumber(L, info->max_memused);
+ lua_pushnumber(L, info->gc_memused);
+ return 2;
+}
+
+
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
@@ -377,11 +465,28 @@
int main (int argc, char **argv) {
int status;
struct Smain s;
- lua_State *L = lua_open(); /* create state */
+ script_info_t *info;
+
+ info = (script_info_t *)calloc(1, sizeof(script_info_t));
+ info->max_memused = 0;
+ info->collecting = 0;
+ info->name = argv[0];
+ info->memused = 0;
+ info->peak_memused = 0;
+
+ lua_State *L = lua_newstate(script_alloc, info);
+
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
+
+ info->L = L;
+
+ luaL_openlibs(L);
+ lua_register(L, "set_memory_limit", set_memory_limit);
+ lua_register(L, "get_memory_limit", get_memory_limit);
+
/* Checking 'sizeof(lua_Integer)' cannot be made in preprocessor on all compilers.
*/
#ifdef LNUM_INT16
@@ -396,6 +501,14 @@
status = lua_cpcall(L, &pmain, &s);
report(L, status);
lua_close(L);
+
+#ifdef LOW_MEM_DEBUG
+ printf("%s: memused=%zd, peak_memused=%zd\n", info->name,
+ info->memused, info->peak_memused);
+#endif
+
+ free(info);
+
return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
}
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