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

src/factory.cc

 // Copyright 2014 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/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 782 matching lines @@
   array->set_map_no_write_barrier(*catch_context_map());
   Handle<Context> context = Handle<Context>::cast(array);
   context->set_closure(*function);
   context->set_previous(*previous);
   context->set_extension(*name);
   context->set_native_context(previous->native_context());
   context->set(Context::THROWN_OBJECT_INDEX, *thrown_object);
   return context;
 }
 
+Handle<Context> Factory::NewDebugEvaluateContext(
+    Handle<Context> previous, Handle<JSReceiver> extension,
+    Handle<Context> wrapped, Handle<NameDictionary> whitelist) {
+  STATIC_ASSERT(Context::WHITE_LIST_INDEX == Context::MIN_CONTEXT_SLOTS + 1);
+  Handle<FixedArray> array = NewFixedArray(Context::MIN_CONTEXT_SLOTS + 2);
+  array->set_map_no_write_barrier(*debug_evaluate_context_map());
+  Handle<Context> context = Handle<Context>::cast(array);
+  context->set_closure(wrapped.is_null() ? previous->closure()
+                                         : wrapped->closure());
+  context->set_previous(*previous);
+  context->set_native_context(previous->native_context());
+  context->set(Context::EXTENSION_INDEX,
+               extension.is_null() ? NULL : *extension);

[Camillo Bruni, 2016/03/30 22:54:51]

nit: should probably use nullptr here

+  context->set(Context::WRAPPED_CONTEXT_INDEX,
+               wrapped.is_null() ? NULL : *wrapped);
+  context->set(Context::WHITE_LIST_INDEX,
+               whitelist.is_null() ? NULL : *whitelist);
+  return context;
+}
 
 Handle<Context> Factory::NewWithContext(Handle<JSFunction> function,
                                         Handle<Context> previous,
                                         Handle<JSReceiver> extension) {
   Handle<FixedArray> array = NewFixedArray(Context::MIN_CONTEXT_SLOTS);
   array->set_map_no_write_barrier(*with_context_map());
   Handle<Context> context = Handle<Context>::cast(array);
   context->set_closure(*function);
   context->set_previous(*previous);
   context->set_extension(*extension);
@@ skipping 1542 matching lines @@
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 }  // namespace internal
 }  // namespace v8