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cleaner and more correct code for 'luaD_shrinkstack' (the old 

test "inuse <= LUAI_MAXSTACK" for stack overflow is not correct,
as the real maximum usable size is "LUAI_MAXSTACK - EXTRA_STACK")
This commit is contained in:
Roberto Ierusalimschy 2016-09-08 13:36:26 -03:00
parent dbb6f11e8e
commit 7fe1a4cff3
1 changed files with 8 additions and 5 deletions
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13
ldo.c
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@ -221,14 +221,17 @@ static int stackinuse (lua_State *L) {
void luaD_shrinkstack (lua_State *L) {
int inuse = stackinuse(L);
int goodsize = inuse + (inuse / 8) + 2*EXTRA_STACK;
if (goodsize > LUAI_MAXSTACK) goodsize = LUAI_MAXSTACK;
if (L->stacksize > LUAI_MAXSTACK) /* was handling stack overflow? */
if (goodsize > LUAI_MAXSTACK)
goodsize = LUAI_MAXSTACK; /* respect stack limit */
if (L->stacksize > LUAI_MAXSTACK) /* had been handling stack overflow? */
luaE_freeCI(L); /* free all CIs (list grew because of an error) */
else
luaE_shrinkCI(L); /* shrink list */
if (inuse <= LUAI_MAXSTACK && /* not handling stack overflow? */
goodsize < L->stacksize) /* trying to shrink? */
luaD_reallocstack(L, goodsize); /* shrink it */
/* if thread is currently not handling a stack overflow and its
good size is smaller than current size, shrink its stack */
if (inuse <= (LUAI_MAXSTACK - EXTRA_STACK) &&
goodsize < L->stacksize)
luaD_reallocstack(L, goodsize);
else
condmovestack(L,,); /* don't change stack (change only for debugging) */
}