[WIP] TrapHandler 2014/11/27.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 09ca02854f12282e81d70327209e7c0f52f1c903..54bfc83a0ed08db167a211b3e06e580b2aaee7e2 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -2532,6 +2532,44 @@ std::string Isolate::GetTurboCfgFileName() {
 }
 
 
+void Isolate::AddGuardArea(void const* address, size_t const length) {
+  DCHECK(address != nullptr);
+  DCHECK(length != 0);
+  DCHECK((bit_cast<uintptr_t>(address) % base::OS::CommitPageSize()) == 0);
+  DCHECK((length % base::OS::CommitPageSize()) == 0);
+  DCHECK(!IsInGuardArea(address));
+  base::OS::Guard(const_cast<void*>(address), length);
+  guard_areas_.push_back(
+      std::make_pair(address, static_cast<uint8_t const*>(address) + length));
+}
+
+
+void Isolate::RemoveGuardArea(void const* address, size_t const length) {
+  DCHECK(address != nullptr);
+  DCHECK(length != 0);
+  DCHECK((bit_cast<uintptr_t>(address) % base::OS::CommitPageSize()) == 0);
+  DCHECK((length % base::OS::CommitPageSize()) == 0);
+  base::OS::Unguard(const_cast<void*>(address), length);
+  for (auto i = guard_areas_.begin(); ; ++i) {
+    DCHECK(i != guard_areas_.end());
+    if (i->first == address) {
+      guard_areas_.erase(i);
+      break;
+    }
+  }
+}
+
+
+bool Isolate::IsInGuardArea(void const* address) const {
+  for (auto i = guard_areas_.begin(); i != guard_areas_.end(); ++i) {
+    if (i->first <= address && address < i->second) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
 bool StackLimitCheck::JsHasOverflowed() const {
   StackGuard* stack_guard = isolate_->stack_guard();
 #ifdef USE_SIMULATOR