Support for global var shortcuts in script contexts.

src/runtime/runtime-debug.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/v8.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/debug.h"
@@ skipping 663 matching lines @@
     local++;
   }
   if (local < local_count) {
     // Get the context containing declarations.
     Handle<Context> context(
         Context::cast(frame_inspector.GetContext())->declaration_context());
     for (; i < scope_info->LocalCount(); ++i) {
       if (scope_info->LocalIsSynthetic(i)) continue;
       Handle<String> name(scope_info->LocalName(i));
       VariableMode mode;
+      VariableLocation location;
       InitializationFlag init_flag;
       MaybeAssignedFlag maybe_assigned_flag;
       locals->set(local * 2, *name);
       int context_slot_index = ScopeInfo::ContextSlotIndex(
-          scope_info, name, &mode, &init_flag, &maybe_assigned_flag);
+          scope_info, name, &mode, &location, &init_flag, &maybe_assigned_flag);
+      DCHECK(VariableLocation::CONTEXT == location);
       Object* value = context->get(context_slot_index);
       locals->set(local * 2 + 1, value);
       local++;
     }
   }
 
   // Check whether this frame is positioned at return. If not top
   // frame or if the frame is optimized it cannot be at a return.
   bool at_return = false;
   if (!is_optimized && index == 0) {
@@ skipping 150 matching lines @@
   details->set(kFrameDetailsReceiverIndex, *receiver);
 
   DCHECK_EQ(details_size, details_index);
   return *isolate->factory()->NewJSArrayWithElements(details);
 }
 
 
 static bool ParameterIsShadowedByContextLocal(Handle<ScopeInfo> info,
                                               Handle<String> parameter_name) {
   VariableMode mode;
+  VariableLocation location;
   InitializationFlag init_flag;
   MaybeAssignedFlag maybe_assigned_flag;
-  return ScopeInfo::ContextSlotIndex(info, parameter_name, &mode, &init_flag,
-                                     &maybe_assigned_flag) != -1;
+  return ScopeInfo::ContextSlotIndex(info, parameter_name, &mode, &location,
+                                     &init_flag, &maybe_assigned_flag) != -1;
 }
 
 
 static Handle<Context> MaterializeReceiver(Isolate* isolate,
                                            Handle<Context> target,
                                            Handle<JSFunction> function,
                                            JavaScriptFrame* frame) {
   Handle<SharedFunctionInfo> shared(function->shared());
   Handle<ScopeInfo> scope_info(shared->scope_info());
   Handle<Object> receiver;
   switch (scope_info->scope_type()) {
     case FUNCTION_SCOPE: {
-      VariableMode variable_mode;
+      VariableMode mode;
+      VariableLocation location;
       InitializationFlag init_flag;
       MaybeAssignedFlag maybe_assigned_flag;
 
       // Don't bother creating a fake context node if "this" is in the context
       // already.
       if (ScopeInfo::ContextSlotIndex(
-              scope_info, isolate->factory()->this_string(), &variable_mode,
+              scope_info, isolate->factory()->this_string(), &mode, &location,
               &init_flag, &maybe_assigned_flag) >= 0) {
         return target;
       }
       receiver = handle(frame->receiver(), isolate);
       break;
     }
     case MODULE_SCOPE:
       receiver = isolate->factory()->undefined_value();
       break;
     case SCRIPT_SCOPE:
@@ skipping 177 matching lines @@
 
 // Set the context local variable value.
 static bool SetContextLocalValue(Isolate* isolate, Handle<ScopeInfo> scope_info,
                                  Handle<Context> context,
                                  Handle<String> variable_name,
                                  Handle<Object> new_value) {
   for (int i = 0; i < scope_info->ContextLocalCount(); i++) {
     Handle<String> next_name(scope_info->ContextLocalName(i));
     if (String::Equals(variable_name, next_name)) {
       VariableMode mode;
+      VariableLocation location;
       InitializationFlag init_flag;
       MaybeAssignedFlag maybe_assigned_flag;
-      int context_index = ScopeInfo::ContextSlotIndex(
-          scope_info, next_name, &mode, &init_flag, &maybe_assigned_flag);
+      int context_index =
+          ScopeInfo::ContextSlotIndex(scope_info, next_name, &mode, &location,
+                                      &init_flag, &maybe_assigned_flag);
       context->set(context_index, *new_value);
       return true;
     }
   }
 
   return false;
 }
 
 
 static bool SetLocalVariableValue(Isolate* isolate, JavaScriptFrame* frame,
@@ skipping 1570 matching lines @@
       isolate, context_builder.outer_info(),
       context_builder.innermost_context(), context_extension, receiver, source);
 
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, maybe_result);
   context_builder.UpdateVariables();
   return *result;
 }
 
 
+static inline bool IsDebugContext(Isolate* isolate, Context* context) {
+  // Try to unwrap script context if it exist.
+  if (context->IsScriptContext()) context = context->previous();
+  DCHECK_NOT_NULL(context);
+  return context == *isolate->debug()->debug_context();
+}
+
+
 RUNTIME_FUNCTION(Runtime_DebugEvaluateGlobal) {
   HandleScope scope(isolate);
 
   // Check the execution state and decode arguments frame and source to be
   // evaluated.
   DCHECK(args.length() == 4);
   CONVERT_NUMBER_CHECKED(int, break_id, Int32, args[0]);
   RUNTIME_ASSERT(isolate->debug()->CheckExecutionState(break_id));
 
   CONVERT_ARG_HANDLE_CHECKED(String, source, 1);
   CONVERT_BOOLEAN_ARG_CHECKED(disable_break, 2);
   CONVERT_ARG_HANDLE_CHECKED(Object, context_extension, 3);
 
   // Handle the processing of break.
   DisableBreak disable_break_scope(isolate->debug(), disable_break);
 
   // Enter the top context from before the debugger was invoked.
   SaveContext save(isolate);
   SaveContext* top = &save;
-  while (top != NULL && *top->context() == *isolate->debug()->debug_context()) {
+  while (top != NULL && IsDebugContext(isolate, *top->context())) {
     top = top->prev();
   }
   if (top != NULL) {
     isolate->set_context(*top->context());
   }
 
   // Get the native context now set to the top context from before the
   // debugger was invoked.
   Handle<Context> context = isolate->native_context();
   Handle<JSObject> receiver(context->global_proxy());
@@ skipping 493 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8