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Calls 'luaF_close' in 'lua_settop' only when needed

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In 'lua_settop', avoid calling 'luaF_close' when increasing the stack
or when the function has no to-be-closed variables.
This commit is contained in:
Roberto Ierusalimschy 2019-07-17 15:22:11 -03:00
parent 8082906c05
commit 9c28ed05c9
1 changed files with 7 additions and 5 deletions
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12
lapi.c
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@ -170,12 +170,13 @@ LUA_API int lua_gettop (lua_State *L) {
LUA_API void lua_settop (lua_State *L, int idx) {
StkId func = L->ci->func;
int diff; /* difference for new top */
CallInfo *ci = L->ci;
StkId func = ci->func;
ptrdiff_t diff; /* difference for new top */
lua_lock(L);
if (idx >= 0) {
api_check(L, idx <= L->ci->top - (func + 1), "new top too large");
diff = (func + 1) + idx - L->top;
api_check(L, idx <= ci->top - (func + 1), "new top too large");
diff = ((func + 1) + idx) - L->top;
for (; diff > 0; diff--)
setnilvalue(s2v(L->top++)); /* clear new slots */
}
@ -183,7 +184,8 @@ LUA_API void lua_settop (lua_State *L, int idx) {
api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
diff = idx + 1; /* will "subtract" index (as it is negative) */
}
luaF_close(L, L->top + diff, LUA_OK);
if (diff < 0 && hastocloseCfunc(ci->nresults))
luaF_close(L, L->top + diff, LUA_OK);
L->top += diff; /* correct top only after closing any upvalue */
lua_unlock(L);
}