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Keep minimum size when shrinking a stack 

When shrinking a stack (during GC), do not make it smaller than the
initial stack size.
This commit is contained in:
Roberto Ierusalimschy 2020-07-06 12:11:54 -03:00
parent b57574d6fb
commit 6298903e35
1 changed files with 2 additions and 3 deletions
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5
ldo.c
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@ -245,13 +245,12 @@ static int stackinuse (lua_State *L) {
void luaD_shrinkstack (lua_State *L) {
int inuse = stackinuse(L);
int goodsize = inuse + (inuse / 8) + 2*EXTRA_STACK;
int goodsize = inuse + BASIC_STACK_SIZE;
if (goodsize > LUAI_MAXSTACK)
goodsize = LUAI_MAXSTACK; /* respect stack limit */
/* 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)
if (inuse <= (LUAI_MAXSTACK - EXTRA_STACK) && goodsize < L->stacksize)
luaD_reallocstack(L, goodsize, 0); /* ok if that fails */
else /* don't change stack */
condmovestack(L,{},{}); /* (change only for debugging) */