Split out the random number state between JavaScript and private API...

src/platform-win32.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 847 matching lines @@
 
   // VirtualAlloc rounds allocated size to page size automatically.
   size_t msize = RoundUp(requested, static_cast<int>(GetPageSize()));
   intptr_t address = NULL;
 
   // Windows XP SP2 allows Data Excution Prevention (DEP).
   int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
 
   // For exectutable pages try and randomize the allocation address
   if (prot == PAGE_EXECUTE_READWRITE && msize >= Page::kPageSize) {
-      address = (V8::Random() << kPageSizeBits) | kAllocationRandomAddressMin;
-      address &= kAllocationRandomAddressMax;
+    address = (V8::RandomPrivate() << kPageSizeBits)
+      | kAllocationRandomAddressMin;
+    address &= kAllocationRandomAddressMax;
   }
 
   LPVOID mbase = VirtualAlloc(reinterpret_cast<void *>(address),
                               msize,
                               MEM_COMMIT | MEM_RESERVE,
                               prot);
   if (mbase == NULL && address != NULL)
     mbase = VirtualAlloc(NULL, msize, MEM_COMMIT | MEM_RESERVE, prot);
 
   if (mbase == NULL) {
@@ skipping 1072 matching lines @@
 
   // Release the thread handles
   CloseHandle(data_->sampler_thread_);
   CloseHandle(data_->profiled_thread_);
 }
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal