[strong] Allow mutually recursive classes.

src/variables.h

 // Copyright 2011 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_VARIABLES_H_
 #define V8_VARIABLES_H_
 
 #include "src/ast-value-factory.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 // The AST refers to variables via VariableProxies - placeholders for the actual
 // variables. Variables themselves are never directly referred to from the AST,
 // they are maintained by scopes, and referred to from VariableProxies and Slots
 // after binding and variable allocation.
 
 class Variable: public ZoneObject {
  public:
-  enum Kind { NORMAL, FUNCTION, THIS, NEW_TARGET, ARGUMENTS };
+  enum Kind { NORMAL, FUNCTION, CLASS, THIS, NEW_TARGET, ARGUMENTS };
 
   enum Location {
     // Before and during variable allocation, a variable whose location is
     // not yet determined.  After allocation, a variable looked up as a
     // property on the global object (and possibly absent).  name() is the
     // variable name, index() is invalid.
     UNALLOCATED,
 
     // A slot in the parameter section on the stack.  index() is the
     // parameter index, counting left-to-right.  The receiver is index -1;
@@ skipping 58 matching lines @@
   bool IsLookupSlot() const { return location_ == LOOKUP; }
   bool IsGlobalObjectProperty() const;
 
   bool is_dynamic() const { return IsDynamicVariableMode(mode_); }
   bool is_const_mode() const { return IsImmutableVariableMode(mode_); }
   bool binding_needs_init() const {
     return initialization_flag_ == kNeedsInitialization;
   }
 
   bool is_function() const { return kind_ == FUNCTION; }
+  bool is_class() const { return kind_ == CLASS; }
   bool is_this() const { return kind_ == THIS; }
   bool is_new_target() const { return kind_ == NEW_TARGET; }
   bool is_arguments() const { return kind_ == ARGUMENTS; }
 
   // True if the variable is named eval and not known to be shadowed.
   bool is_possibly_eval(Isolate* isolate) const {
     return IsVariable(isolate->factory()->eval_string());
   }
 
   Variable* local_if_not_shadowed() const {
@@ skipping 61 matching lines @@
   bool force_context_allocation_;  // set by variable resolver
   bool is_used_;
   InitializationFlag initialization_flag_;
   MaybeAssignedFlag maybe_assigned_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_VARIABLES_H_