Debugger: use FrameInspector in ScopeIterator to find context.

test/mjsunit/regress/regress-4309-1.js

Index: test/mjsunit/regress/regress-4309-1.js
diff --git a/test/mjsunit/regress/regress-4309-1.js b/test/mjsunit/regress/regress-4309-1.js
new file mode 100644
index 0000000000000000000000000000000000000000..a13fd43a4ab3fb7281da2b8f1261cbe65d269b19
--- /dev/null
+++ b/test/mjsunit/regress/regress-4309-1.js
@@ -0,0 +1,37 @@
+// 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.
+
+// Flags: --expose-debug-as debug --allow-natives-syntax
+
+var Debug = debug.Debug;
+
+var exception = null;
+
+function listener(event, exec_state, event_data, data) {
+  if (event != Debug.DebugEvent.Break) return;
+  try {
+    var scopes = exec_state.frame().allScopes();
+    assertEquals(3, scopes.length);
+    assertEquals(debug.ScopeType.Local, scopes[0].scopeType());
+    assertEquals(debug.ScopeType.Script, scopes[1].scopeType());
+    assertEquals(debug.ScopeType.Global, scopes[2].scopeType());
+  } catch (e) {
+    exception = e;
+  }
+}
+
+function f() {
+  eval('');
+  debugger;
+}
+
+f();
+f();
+
+%OptimizeFunctionOnNextCall(f);
+Debug.setListener(listener);
+
+f();
+
+assertNull(exception);