From: Richard Trieu <rtrieu@google.com>
Date: Thu, 24 Jan 2013 04:29:24 +0000 (+0000)
Subject: Add asserts to SmallVector so that calls to front() and back() only succeed
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0ac7e6f293bc502b39005496d2160b0089d3fa46;p=oota-llvm.git

Add asserts to SmallVector so that calls to front() and back() only succeed
if the vector is not empty.  This will ensure that calls to these functions
will reference elements in the vector.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173321 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/ADT/SmallVector.h b/include/llvm/ADT/SmallVector.h
index 951e5741ffb..9167f872185 100644
--- a/include/llvm/ADT/SmallVector.h
+++ b/include/llvm/ADT/SmallVector.h
@@ -145,16 +145,20 @@ public:
   }
 
   reference front() {
+    assert(!empty());
     return begin()[0];
   }
   const_reference front() const {
+    assert(!empty());
     return begin()[0];
   }
 
   reference back() {
+    assert(!empty());
     return end()[-1];
   }
   const_reference back() const {
+    assert(!empty());
     return end()[-1];
   }
 };