Go into slow case when encountering object initialization on the top level to...

src/ast.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1088 matching lines @@
  private:
   Expression* condition_;
   Expression* then_expression_;
   Expression* else_expression_;
 };
 
 
 class Assignment: public Expression {
  public:
   Assignment(Token::Value op, Expression* target, Expression* value, int pos)
-      : op_(op), target_(target), value_(value), pos_(pos) {
+      : op_(op), target_(target), value_(value), pos_(pos),
+        block_start_(false), block_end_(false) {
     ASSERT(Token::IsAssignmentOp(op));
   }
 
   virtual void Accept(AstVisitor* v);
   virtual Assignment* AsAssignment() { return this; }
 
   Token::Value binary_op() const;
 
   Token::Value op() const { return op_; }
   Expression* target() const { return target_; }
   Expression* value() const { return value_; }
   int position() { return pos_; }
 
+  // An initialization block is a series of statments of the form
+  // x.y.z.a = ...; x.y.z.b = ...; etc. The parser marks the beginning and
+  // ending of these blocks to allow for optimizations of initialization
+  // blocks.
+  bool starts_initialization_block() { return block_start_; }
+  bool ends_initialization_block() { return block_end_; }
+  void mark_block_start() { block_start_ = true; }
+  void mark_block_end() { block_end_ = true; }
+
  private:
   Token::Value op_;
   Expression* target_;
   Expression* value_;
   int pos_;
+  bool block_start_;
+  bool block_end_;
 };
 
 
 class Throw: public Expression {
  public:
   Throw(Expression* exception, int pos)
       : exception_(exception), pos_(pos) {}
 
   virtual void Accept(AstVisitor* v);
   Expression* exception() const { return exception_; }
@@ skipping 486 matching lines @@
 #undef DEF_VISIT
 
  private:
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_