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Make sure the memory range is writable before memset'ing it. 

llvm-svn: 81308
This commit is contained in:
Evan Cheng 2009-09-09 01:45:24 +00:00
parent 98e0a59acc
commit 49adbf42b1
1 changed files with 2 additions and 0 deletions
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2
llvm/lib/Support/Allocator.cpp
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@ -15,6 +15,7 @@
#include "llvm/Support/DataTypes.h" #include "llvm/Support/DataTypes.h"
#include "llvm/Support/Recycler.h" #include "llvm/Support/Recycler.h"
#include "llvm/Support/raw_ostream.h" #include "llvm/Support/raw_ostream.h"
#include "llvm/System/Memory.h"
#include <cstring> #include <cstring>
namespace llvm { namespace llvm {
@ -60,6 +61,7 @@ void BumpPtrAllocator::DeallocateSlabs(MemSlab *Slab) {
#ifndef NDEBUG #ifndef NDEBUG
// Poison the memory so stale pointers crash sooner. Note we must // Poison the memory so stale pointers crash sooner. Note we must
// preserve the Size and NextPtr fields at the beginning. // 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)); memset(Slab + 1, 0xCD, Slab->Size - sizeof(MemSlab));
#endif #endif
Allocator.Deallocate(Slab); Allocator.Deallocate(Slab);