Reland "Prevent liveedit on or under generators with open activations"

src/liveedit.h

 // 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.
 
 #ifndef V8_LIVEEDIT_H_
 #define V8_LIVEEDIT_H_
 
 
 
 // Live Edit feature implementation.
@@ skipping 71 matching lines @@
   static Handle<Object> ChangeScriptSource(Handle<Script> original_script,
                                            Handle<String> new_source,
                                            Handle<Object> old_script_name);
 
   // In a code of a parent function replaces original function as embedded
   // object with a substitution one.
   static void ReplaceRefToNestedFunction(Handle<JSValue> parent_function_shared,
                                          Handle<JSValue> orig_function_shared,
                                          Handle<JSValue> subst_function_shared);
 
+  // Find open generator activations, and set corresponding "result" elements to
+  // FUNCTION_BLOCKED_ACTIVE_GENERATOR.
+  static bool FindActiveGenerators(Handle<FixedArray> shared_info_array,
+                                   Handle<FixedArray> result, int len);
+
   // Checks listed functions on stack and return array with corresponding
   // FunctionPatchabilityStatus statuses; extra array element may
   // contain general error message. Modifies the current stack and
   // has restart the lowest found frames and drops all other frames above
   // if possible and if do_drop is true.
   static Handle<JSArray> CheckAndDropActivations(
       Handle<JSArray> shared_info_array, bool do_drop);
 
   // Restarts the call frame and completely drops all frames above it.
   // Return error message or NULL.
   static const char* RestartFrame(JavaScriptFrame* frame);
 
   // A copy of this is in liveedit-debugger.js.
   enum FunctionPatchabilityStatus {
     FUNCTION_AVAILABLE_FOR_PATCH = 1,
     FUNCTION_BLOCKED_ON_ACTIVE_STACK = 2,
     FUNCTION_BLOCKED_ON_OTHER_STACK = 3,
     FUNCTION_BLOCKED_UNDER_NATIVE_CODE = 4,
-    FUNCTION_REPLACED_ON_ACTIVE_STACK = 5
+    FUNCTION_REPLACED_ON_ACTIVE_STACK = 5,
+    FUNCTION_BLOCKED_UNDER_GENERATOR = 6,
+    FUNCTION_BLOCKED_ACTIVE_GENERATOR = 7
   };
 
   // Compares 2 strings line-by-line, then token-wise and returns diff in form
   // of array of triplets (pos1, pos1_end, pos2_end) describing list
   // of diff chunks.
   static Handle<JSArray> CompareStrings(Handle<String> s1,
                                         Handle<String> s2);
 };
 
 
@@ skipping 179 matching lines @@
   static const int kEndPositionOffset_ = 2;
   static const int kSharedInfoOffset_ = 3;
   static const int kSize_ = 4;
 
   friend class JSArrayBasedStruct<SharedInfoWrapper>;
 };
 
 } }  // namespace v8::internal
 
 #endif /* V*_LIVEEDIT_H_ */