view hotspot/src/share/vm/ci/ciKlass.hpp @ 4761:bdb7375a1fee

6902182: 4/4 Starting with jdwp agent should not incur performance penalty Summary: Rename can_post_exceptions support to can_post_on_exceptions. Add support for should_post_on_exceptions flag to permit per JavaThread optimizations. Reviewed-by: never, kvn, dcubed Contributed-by:
author dcubed
date Mon, 01 Feb 2010 17:35:05 -0700
parents 489c9b5090e2
children f4b087cbb361
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 * Copyright 1999-2009 Sun Microsystems, Inc.  All Rights Reserved.
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit if you need additional information or
 * have any questions.

// ciKlass
// This class and its subclasses represent klassOops in the
// HotSpot virtual machine.  In the vm, each klassOop contains an
// embedded Klass object.  ciKlass is subclassed to explicitly
// represent the kind of Klass embedded in the klassOop.  For
// example, a klassOop with an embedded objArrayKlass object is
// represented in the ciObject hierarchy by the class
// ciObjArrayKlass.
class ciKlass : public ciType {
  friend class ciEnv;
  friend class ciField;
  friend class ciMethod;
  friend class ciObjArrayKlass;

  ciSymbol* _name;
  jint _layout_helper;

  ciKlass(KlassHandle k_h, ciSymbol* name);
  ciKlass(ciSymbol* name, ciKlass* klass);

  klassOop get_klassOop() const {
    klassOop k = (klassOop)get_oop();
    assert(k != NULL, "illegal use of unloaded klass");
    return k;

  Klass*   get_Klass() const { return get_klassOop()->klass_part(); }

  // Certain subklasses have an associated class loader.
  virtual oop loader()             { return NULL; }
  virtual jobject loader_handle()  { return NULL; }

  virtual oop protection_domain()             { return NULL; }
  virtual jobject protection_domain_handle()  { return NULL; }

  const char* type_string() { return "ciKlass"; }

  void print_impl(outputStream* st);

  ciKlass(KlassHandle k_h);

  // What is the name of this klass?
  ciSymbol* name() const { return _name; }

  // What is its layout helper value?
  jint layout_helper() { return _layout_helper; }

  bool is_subtype_of(ciKlass* klass);
  bool is_subclass_of(ciKlass* klass);
  juint super_depth();
  juint super_check_offset();
  ciKlass* super_of_depth(juint i);
  bool can_be_primary_super();
  static juint primary_super_limit() { return Klass::primary_super_limit(); }

  // Get the shared parent of two klasses.
  ciKlass* least_common_ancestor(ciKlass* k);

  virtual bool is_interface() {
    return false;

  virtual bool is_abstract() {
    return false;

  // Does this type (array, class, interface) have no subtypes?
  virtual bool is_leaf_type() {
    return false;

  // Attempt to get a klass using this ciKlass's loader.
  ciKlass* find_klass(ciSymbol* klass_name);
  // Note:  To find a class from its name string, use ciSymbol::make,
  // but consider adding to vmSymbols.hpp instead.

  // Get the instance of java.lang.Class corresponding to this klass.
  ciInstance*            java_mirror();

  // Fetch Klass::modifier_flags.
  jint                   modifier_flags();

  // Fetch Klass::access_flags.
  jint                   access_flags();

  // What kind of ciObject is this?
  bool is_klass() { return true; }

  void print_name_on(outputStream* st);