[llvm] r216624 - Avoid zero length memset error

[Renato Golin]

Author: rengolin
Date: Wed Aug 27 16:58:56 2014
New Revision: 216624

URL: http://llvm.org/viewvc/llvm-project?rev=216624&view=rev
Log:
Avoid zero length memset error

Adding a check on buffer lenght to avoid a __warn_memset_zero_len
warning on GCC 4.8.2.

Modified:
    llvm/trunk/include/llvm/Support/Allocator.h

Modified: llvm/trunk/include/llvm/Support/Allocator.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/Allocator.h?rev=216624&r1=216623&r2=216624&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/Allocator.h (original)
+++ llvm/trunk/include/llvm/Support/Allocator.h Wed Aug 27 16:58:56 2014
@@ -318,8 +318,10 @@ private:
 #ifndef NDEBUG
       // Poison the memory so stale pointers crash sooner.  Note we must
       // preserve the Size and NextPtr fields at the beginning.
-      sys::Memory::setRangeWritable(*I, AllocatedSlabSize);
-      memset(*I, 0xCD, AllocatedSlabSize);
+      if (AllocatedSlabSize != 0) {
+        sys::Memory::setRangeWritable(*I, AllocatedSlabSize);
+        memset(*I, 0xCD, AllocatedSlabSize);
+      }
 #endif
       Allocator.Deallocate(*I, AllocatedSlabSize);
     }