[WIP] TrapHandler 2014/11/27.

src/base/platform/platform-win32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for Win32.
 
 // Secure API functions are not available using MinGW with msvcrt.dll
 // on Windows XP. Make sure MINGW_HAS_SECURE_API is not defined to
 // disable definition of secure API functions in standard headers that
 // would conflict with our own implementation.
@@ skipping 781 matching lines @@
   return 4096;
 }
 
 
 void OS::ProtectCode(void* address, const size_t size) {
   DWORD old_protect;
   VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect);
 }
 
 
-void OS::Guard(void* address, const size_t size) {
+void OS::Guard(void* const address, size_t const size) {
   DWORD oldprotect;
   VirtualProtect(address, size, PAGE_NOACCESS, &oldprotect);
 }
 
 
+void OS::Unguard(void* const address, size_t const size) {
+  DWORD oldprotect;
+  VirtualProtect(address, size, PAGE_READWRITE, &oldprotect);
+}
+
+
 void OS::Sleep(int milliseconds) {
   ::Sleep(milliseconds);
 }
 
 
 void OS::Abort() {
   if (g_hard_abort) {
     V8_IMMEDIATE_CRASH();
   }
   // Make the MSVCRT do a silent abort.
@@ skipping 563 matching lines @@
   DCHECK(result);
 }
 
 
 
 void Thread::YieldCPU() {
   Sleep(0);
 }
 
 } }  // namespace v8::base