类文件介绍

ClassFile {
    u4             magic;

    u2             minor_version;
    u2             major_version;

    u2             constant_pool_count;
    cp_info        constant_pool[constant_pool_count-1];

    u2             access_flags;
    u2             this_class;
    u2             super_class;

    u2             interfaces_count;
    u2             interfaces[interfaces_count];

    u2             fields_count;
    field_info     fields[fields_count];

    u2             methods_count;
    method_info    methods[methods_count];

    u2             attributes_count;
    attribute_info attributes[attributes_count];
}

源代码位置：src/share/vm/classfile/classLoader.hpp
class ClassFileParser VALUE_OBJ_CLASS_SPEC {
 private:
  u2        _major_version;
  u2        _minor_version;
  Symbol*   _class_name;
  ClassLoaderData*         _loader_data;
  KlassHandle              _host_klass;
  GrowableArray<Handle>*   _cp_patches; // overrides for CP entries


  // class attributes parsed before the instance klass is created:
  bool        _synthetic_flag;
  int         _sde_length;
  char*       _sde_buffer;
  u2          _sourcefile_index;
  u2          _generic_signature_index;

  // Metadata created before the instance klass is created.  Must be deallocated
  // if not transferred to the InstanceKlass upon successful class loading
  // in which case these pointers have been set to NULL.
  instanceKlassHandle _super_klass;
  ConstantPool*    _cp;
  Array<u2>*       _fields;
  Array<Method*>*  _methods;
  Array<u2>*       _inner_classes;
  Array<Klass*>*   _local_interfaces;
  Array<Klass*>*   _transitive_interfaces;
  // ...
  InstanceKlass*   _klass;  // InstanceKlass once created.
  …
  ClassFileStream* _stream;              // Actual input stream
  ...
}