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adds assertions to protect u3r_mug against stack overflow

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This commit is contained in:
Joe Bryan 2019-01-15 23:57:45 -05:00
parent 76fa248700
commit e655b07ecb
1 changed files with 11 additions and 0 deletions
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11
noun/retrieve.c
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@ -1603,6 +1603,17 @@ static inline mugframe*
_mug_push(c3_ys mov, c3_ys off, u3_noun veb)
{
u3R->cap_p += mov;
// ensure we haven't overflowed the stack
// (off==0 means we're on a north road)
//
if ( 0 == off ) {
c3_assert(u3R->cap_p > u3R->hat_p);
}
else {
c3_assert(u3R->cap_p < u3R->hat_p);
}
mugframe* cur = u3to(mugframe, u3R->cap_p + off);
cur->veb = veb;
cur->a = 0;