[WIP] TrapHandler 2014/11/27.

src/base/platform/platform-posix.cc

Index: src/base/platform/platform-posix.cc
diff --git a/src/base/platform/platform-posix.cc b/src/base/platform/platform-posix.cc
index 0b16dfdcc6bae14c943f2253e40674c2edb667d0..f3468e7587fb200f22d2afc3567e771e2ac42a8d 100644
--- a/src/base/platform/platform-posix.cc
+++ b/src/base/platform/platform-posix.cc
@@ -122,7 +122,7 @@ void OS::ProtectCode(void* address, const size_t size) {
 
 
 // Create guard pages.
-void OS::Guard(void* address, const size_t size) {
+void OS::Guard(void* const address, size_t const size) {
 #if V8_OS_CYGWIN
   DWORD oldprotect;
   VirtualProtect(address, size, PAGE_NOACCESS, &oldprotect);
@@ -132,6 +132,17 @@ void OS::Guard(void* address, const size_t size) {
 }
 
 
+// Remove guard pages.
+void OS::Unguard(void* const address, size_t const size) {
+#if V8_OS_CYGWIN
+  DWORD oldprotect;
+  VirtualProtect(address, size, PAGE_READWRITE, &oldprotect);
+#else
+  mprotect(address, size, PROT_READ | PROT_WRITE);
+#endif
+}
+
+
 static LazyInstance<RandomNumberGenerator>::type
     platform_random_number_generator = LAZY_INSTANCE_INITIALIZER;