[llvm-commits] [llvm] r81308 - /llvm/trunk/lib/Support/Allocator.cpp

[Evan Cheng]

Author: evancheng
Date: Tue Sep  8 20:45:24 2009
New Revision: 81308

URL: http://llvm.org/viewvc/llvm-project?rev=81308&view=rev
Log:
Make sure the memory range is writable before memset'ing it.

Modified:
    llvm/trunk/lib/Support/Allocator.cpp

Modified: llvm/trunk/lib/Support/Allocator.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Allocator.cpp?rev=81308&r1=81307&r2=81308&view=diff

==============================================================================
--- llvm/trunk/lib/Support/Allocator.cpp (original)
+++ llvm/trunk/lib/Support/Allocator.cpp Tue Sep  8 20:45:24 2009
@@ -15,6 +15,7 @@
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/Recycler.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Memory.h"
 #include <cstring>
 
 namespace llvm {
@@ -60,6 +61,7 @@
 #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(Slab + 1, Slab->Size - sizeof(MemSlab));
     memset(Slab + 1, 0xCD, Slab->Size - sizeof(MemSlab));
 #endif
     Allocator.Deallocate(Slab);