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A to-be-closed variable must have a closable value (or be nil)

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It is an error for a to-be-closed variable to have a non-closable
non-nil value when it is being closed. This situation does not seem to
be useful and often hints to an error. (Particularly in the C API, it is
easy to change a to-be-closed index by mistake.)
This commit is contained in:
Roberto Ierusalimschy 2018-11-29 16:02:44 -02:00
parent 7696c6474f
commit 6d04537ea6
9 changed files with 83 additions and 39 deletions
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6
lfunc.c
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@ -14,6 +14,7 @@
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
@ -140,6 +141,11 @@ static int closeupval (lua_State *L, TValue *uv, StkId level, int status) {
if (likely(status == LUA_OK)) {
if (prepclosingmethod(L, uv, &G(L)->nilvalue)) /* something to call? */
callclose(L, NULL); /* call closing method */
else if (!ttisnil(uv)) { /* non-closable non-nil value? */
const char *vname = luaG_findlocal(L, L->ci, level - L->ci->func, NULL);
if (vname == NULL) vname = "?";
luaG_runerror(L, "attempt to close non-closable variable '%s'", vname);
}
}
else { /* there was an error */
/* save error message and set stack top to 'level + 1' */