- Add the ability to protect VirtualMemory.

runtime/vm/virtual_memory_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/virtual_memory.h"
 
 #include "platform/assert.h"
 
 namespace dart {
 
@@ skipping 41 matching lines @@
 bool VirtualMemory::Commit(uword addr, intptr_t size, bool executable) {
   ASSERT(Contains(addr));
   ASSERT(Contains(addr + size) || (addr + size == end()));
   int prot = executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
   if (VirtualAlloc(address(), size, MEM_COMMIT, prot) == NULL) {
     return false;
   }
   return true;
 }
 
+
+bool VirtualMemory::Protect(Protection mode) {
+  int prot = 0;
+  switch (mode) {
+    case kNoAccess:
+      prot = PAGE_NOACCESS;
+      break;
+    case kReadOnly:
+      prot = PAGE_READONLY;
+      break;
+    case kReadWrite:
+      prot = PAGE_READWRITE;
+      break;
+    case kReadExecute:
+      prot = PAGE_EXECUTE_READ;
+      break;
+    case kReadWriteExecute:
+      prot = PAGE_EXECUTE_READWRITE;
+      break;
+  }
+  int old_prot = 0;
+  return VirtualProtect(address(), size(), prot, &old_prot);
+}
+
 }  // namespace dart