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, 5 deletions

diff --git a/gcc/vec.h b/gcc/vec.h
index f97e022..b1ebda4 100644
--- a/gcc/vec.h
+++ b/gcc/vec.h
@@ -283,11 +283,7 @@ va_heap::reserve (vec<T, va_heap, vl_embed> *&v, unsigned reserve, bool exact
 {
   unsigned alloc
     = vec_prefix::calculate_allocation (v ? &v->m_vecpfx : 0, reserve, exact);
-  if (!alloc)
-    {
-      release (v);
-      return;
-    }
+  gcc_assert (alloc);
 
   if (GATHER_STATISTICS && v)
     v->m_vecpfx.release_overhead ();