Delay Class parsing until the class is actually used.

runtime/vm/compiler.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_COMPILER_H_
 #define VM_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 #include "vm/runtime_entry.h"
 
 namespace dart {
 
 // Forward declarations.
 class Class;
 class Function;
 class Library;
 class ParsedFunction;
 class RawInstance;
 class Script;
 class SequenceNode;
 
 DECLARE_RUNTIME_ENTRY(CompileFunction);
 
 class Compiler : public AllStatic {
  public:
-  // Extracts class, interface, function symbols from the script and populates
-  // the symbol tables and the class dictionary of the library.
+  // Extracts top level entities from the script and populates
+  // the class dictionary of the library.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* Compile(const Library& library, const Script& script);
 
+  // Extracts function and field symbols from the class and populates
+  // the class.
+  //
+  // Returns Error::null() if there is no compilation error.
+  static RawError* CompileClass(const Class& cls);
+
   // Generates code for given function and sets its code field.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileFunction(const Function& function);
 
   // Generates optimized code for function.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileOptimizedFunction(const Function& function);
 
@@ skipping 13 matching lines @@
 
   // Eagerly compiles all functions in a class.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileAllFunctions(const Class& cls);
 };
 
 }  // namespace dart
 
 #endif  // VM_COMPILER_H_