[debugger] allow debug-evaluate to change stack and context values.

src/ast/scopes.cc

 // 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.
 
 #include "src/ast/scopes.h"
 
 #include "src/accessors.h"
 #include "src/ast/scopeinfo.h"
 #include "src/bootstrapper.h"
 #include "src/messages.h"
@@ skipping 190 matching lines @@
   }
 }
 
 
 Scope* Scope::DeserializeScopeChain(Isolate* isolate, Zone* zone,
                                     Context* context, Scope* script_scope) {
   // Reconstruct the outer scope chain from a closure's context chain.
   Scope* current_scope = NULL;
   Scope* innermost_scope = NULL;
   while (!context->IsNativeContext()) {
-    if (context->IsWithContext()) {
+    if (context->IsWithContext() || context->IsDebugEvaluateContext()) {
+      // For scope analysis, debug-evaluate is equivalent to a with scope.
       Scope* with_scope = new (zone)
           Scope(zone, current_scope, WITH_SCOPE, Handle<ScopeInfo>::null(),
                 script_scope->ast_value_factory_);
       current_scope = with_scope;
       // All the inner scopes are inside a with.
       for (Scope* s = innermost_scope; s != NULL; s = s->outer_scope()) {
         s->scope_inside_with_ = true;
       }
     } else if (context->IsScriptContext()) {
       ScopeInfo* scope_info = context->scope_info();
@@ skipping 1278 matching lines @@
       function_ != NULL && function_->proxy()->var()->IsContextSlot();
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() -
          (is_function_var_in_context ? 1 : 0);
 }
 
 
 int Scope::ContextGlobalCount() const { return num_global_slots(); }
 
 }  // namespace internal
 }  // namespace v8