[inspector] gracefully handle stack overflows in the inspector.

src/inspector/v8-debugger-agent-impl.cc

 // Copyright 2015 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.
 
 #include "src/inspector/v8-debugger-agent-impl.h"
 
 #include <algorithm>
 
 #include "src/debug/debug-interface.h"
 #include "src/inspector/injected-script.h"
@@ skipping 929 matching lines @@
       v8::DebugInterface::GetDebugContext(m_isolate);
   v8::Context::Scope contextScope(debuggerContext);
 
   v8::Local<v8::Array> objects = v8::Array::New(m_isolate);
 
   for (size_t frameOrdinal = 0; frameOrdinal < m_pausedCallFrames.size();
        ++frameOrdinal) {
     const std::unique_ptr<JavaScriptCallFrame>& currentCallFrame =
         m_pausedCallFrames[frameOrdinal];
 
-    v8::Local<v8::Object> details = currentCallFrame->details();
-    if (details.IsEmpty()) return Response::InternalError();
+    v8::Local<v8::Value> details_value;
+    if (!currentCallFrame->details().ToLocal(&details_value))
+      return Response::InternalError();
+    v8::Local<v8::Object> details = v8::Local<v8::Object>::Cast(details_value);
 
     int contextId = currentCallFrame->contextId();
 
     InjectedScript* injectedScript = nullptr;
     if (contextId) m_session->findInjectedScript(contextId, injectedScript);
 
     String16 callFrameId =
         RemoteCallFrameId::serialize(contextId, static_cast<int>(frameOrdinal));
     if (!details
              ->Set(debuggerContext,
@@ skipping 304 matching lines @@
 
 void V8DebuggerAgentImpl::reset() {
   if (!enabled()) return;
   m_scheduledDebuggerStep = NoStep;
   m_scripts.clear();
   m_blackboxedPositions.clear();
   m_breakpointIdToDebuggerBreakpointIds.clear();
 }
 
 }  // namespace v8_inspector