don't try and free what must be a null vector when reserving 0 elements

in va_heap::reserve

2013-11-05  Trevor Saunders  <tsaunders@mozilla.com>

	* vec.c (vec_prefix::calculate_allocation): Don't try to handle the
	case of no prefix and reserving zero slots, because when that's the
	case we'll never get here.
	* vec.h (va_heap::reserve): Don't try and handle
	vec_prefix::calculate_allocation returning zero because that should
	never happen.

From-SVN: r204392

1 files changed, 1 insertions, 3 deletions

diff --git a/gcc/vec.c b/gcc/vec.c
index f3c3315..78252e0 100644
--- a/gcc/vec.c
+++ b/gcc/vec.c
@@ -187,9 +187,7 @@ vec_prefix::calculate_allocation (vec_prefix *pfx, unsigned reserve,
       num = pfx->m_num;
     }
   else if (!reserve)
-    /* If there's no vector, and we've not requested anything, then we
-       will create a NULL vector.  */
-    return 0;
+    gcc_unreachable ();
 
   /* We must have run out of room.  */
   gcc_assert (alloc - num < reserve);