/*+
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 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.+
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.+
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 *+
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 * This code is free software; you can redistribute it and/or modify it+
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 * under the terms of the GNU General Public License version 2 only, as+
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 * published by the Free Software Foundation.+
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 *+
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 * This code is distributed in the hope that it will be useful, but WITHOUT+
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or+
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License+
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 * version 2 for more details (a copy is included in the LICENSE file that+
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 * accompanied this code).+
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 *+
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 * You should have received a copy of the GNU General Public License version+
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 * 2 along with this work; if not, write to the Free Software Foundation,+
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.+
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 *+
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA+
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 * or visit www.oracle.com if you need additional information or have any+
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 * questions.+
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 *+
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 */+
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+
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#include "precompiled.hpp"+
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#include "ci/ciKlass.hpp"+
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#include "ci/ciSymbol.hpp"+
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#include "ci/ciUtilities.hpp"+
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#include "oops/oop.inline.hpp"+
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+
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// ciKlass+
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//+
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// This class represents a Klass* in the HotSpot virtual+
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// machine.+
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+
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// ------------------------------------------------------------------+
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// ciKlass::ciKlass+
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ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {+
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  assert(get_Klass()->is_klass(), "wrong type");+
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  Klass* k = get_Klass();+
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  _layout_helper = k->layout_helper();+
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  Symbol* klass_name = k->name();+
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  assert(klass_name != NULL, "wrong ciKlass constructor");+
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  _name = CURRENT_ENV->get_symbol(klass_name);+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::ciKlass+
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//+
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// Nameless klass variant.+
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ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {+
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  assert(get_Klass()->is_klass(), "wrong type");+
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  _name = name;+
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  _layout_helper = Klass::_lh_neutral_value;+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::ciKlass+
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//+
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// Unloaded klass variant.+
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ciKlass::ciKlass(ciSymbol* name, BasicType bt) : ciType(bt) {+
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  _name = name;+
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  _layout_helper = Klass::_lh_neutral_value;+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::is_subtype_of+
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bool ciKlass::is_subtype_of(ciKlass* that) {+
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  assert(is_loaded() && that->is_loaded(), "must be loaded");+
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  // Check to see if the klasses are identical.+
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  if (this == that) {+
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    return true;+
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  }+
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+
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  VM_ENTRY_MARK;+
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  Klass* this_klass = get_Klass();+
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  Klass* that_klass = that->get_Klass();+
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  bool result = this_klass->is_subtype_of(that_klass);+
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+
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  return result;+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::is_subclass_of+
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bool ciKlass::is_subclass_of(ciKlass* that) {+
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  assert(is_loaded() && that->is_loaded(), "must be loaded");+
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  // Check to see if the klasses are identical.+
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+
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  VM_ENTRY_MARK;+
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  Klass* this_klass = get_Klass();+
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  Klass* that_klass = that->get_Klass();+
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  bool result = this_klass->is_subclass_of(that_klass);+
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+
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  return result;+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::super_depth+
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juint ciKlass::super_depth() {+
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  assert(is_loaded(), "must be loaded");+
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+
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  VM_ENTRY_MARK;+
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  Klass* this_klass = get_Klass();+
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  return this_klass->super_depth();+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::super_check_offset+
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juint ciKlass::super_check_offset() {+
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  assert(is_loaded(), "must be loaded");+
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+
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  VM_ENTRY_MARK;+
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  Klass* this_klass = get_Klass();+
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  return this_klass->super_check_offset();+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::super_of_depth+
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ciKlass* ciKlass::super_of_depth(juint i) {+
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  assert(is_loaded(), "must be loaded");+
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+
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  VM_ENTRY_MARK;+
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  Klass* this_klass = get_Klass();+
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  Klass* super = this_klass->primary_super_of_depth(i);+
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  return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL;+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::can_be_primary_super+
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bool ciKlass::can_be_primary_super() {+
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  assert(is_loaded(), "must be loaded");+
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+
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  VM_ENTRY_MARK;+
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  Klass* this_klass = get_Klass();+
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  return this_klass->can_be_primary_super();+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::least_common_ancestor+
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//+
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// Get the shared parent of two klasses.+
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//+
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// Implementation note: this method currently goes "over the wall"+
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// and does all of the work on the VM side.  It could be rewritten+
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// to use the super() method and do all of the work (aside from the+
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// lazy computation of super()) in native mode.  This may be+
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// worthwhile if the compiler is repeatedly requesting the same lca+
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// computation or possibly if most of the superklasses have already+
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// been created as ciObjects anyway.  Something to think about...+
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ciKlass*+
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ciKlass::least_common_ancestor(ciKlass* that) {+
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  assert(is_loaded() && that->is_loaded(), "must be loaded");+
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  // Check to see if the klasses are identical.+
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  if (this == that) {+
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    return this;+
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  }+
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+
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  VM_ENTRY_MARK;+
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  Klass* this_klass = get_Klass();+
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  Klass* that_klass = that->get_Klass();+
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  Klass* lca        = this_klass->LCA(that_klass);+
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+
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  // Many times the LCA will be either this_klass or that_klass.+
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  // Treat these as special cases.+
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  if (lca == that_klass) {+
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    return that;+
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  }+
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  if (this_klass == lca) {+
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    return this;+
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  }+
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+
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  // Create the ciInstanceKlass for the lca.+
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  ciKlass* result =+
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    CURRENT_THREAD_ENV->get_klass(lca);+
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+
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  return result;+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::find_klass+
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//+
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// Find a klass using this klass's class loader.+
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ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {+
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  assert(is_loaded(), "cannot find_klass through an unloaded klass");+
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  return CURRENT_ENV->get_klass_by_name(this,+
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                                        klass_name, false);+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::java_mirror+
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//+
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// Get the instance of java.lang.Class corresponding to this klass.+
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// If it is an unloaded instance or array klass, return an unloaded+
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// mirror object of type Class.+
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ciInstance* ciKlass::java_mirror() {+
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  GUARDED_VM_ENTRY(+
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    if (!is_loaded())+
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      return ciEnv::current()->get_unloaded_klass_mirror(this);+
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    oop java_mirror = get_Klass()->java_mirror();+
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    return CURRENT_ENV->get_instance(java_mirror);+
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  )+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::modifier_flags+
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jint ciKlass::modifier_flags() {+
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  assert(is_loaded(), "not loaded");+
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  GUARDED_VM_ENTRY(+
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    return get_Klass()->modifier_flags();+
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  )+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::access_flags+
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jint ciKlass::access_flags() {+
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  assert(is_loaded(), "not loaded");+
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  GUARDED_VM_ENTRY(+
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    return get_Klass()->access_flags().as_int();+
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  )+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::print_impl+
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//+
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// Implementation of the print method+
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void ciKlass::print_impl(outputStream* st) {+
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  st->print(" name=");+
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  print_name_on(st);+
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}+
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+
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// ------------------------------------------------------------------+
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// ciKlass::print_name+
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//+
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// Print the name of this klass+
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void ciKlass::print_name_on(outputStream* st) {+
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  name()->print_symbol_on(st);+
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}+
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