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Java example source code file (ciKlass.cpp)

This example Java source code file (ciKlass.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

basictype, current_env-, current_thread_env\-, guarded_vm_entry, klass, klass\:\:_lh_neutral_value, null, symbol, vm_entry_mark

The ciKlass.cpp Java example source code

/*
 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "precompiled.hpp"
#include "ci/ciKlass.hpp"
#include "ci/ciSymbol.hpp"
#include "ci/ciUtilities.hpp"
#include "oops/oop.inline.hpp"

// ciKlass
//
// This class represents a Klass* in the HotSpot virtual
// machine.

// ------------------------------------------------------------------
// ciKlass::ciKlass
ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {
  assert(get_Klass()->is_klass(), "wrong type");
  Klass* k = get_Klass();
  _layout_helper = k->layout_helper();
  Symbol* klass_name = k->name();
  assert(klass_name != NULL, "wrong ciKlass constructor");
  _name = CURRENT_ENV->get_symbol(klass_name);
}

// ------------------------------------------------------------------
// ciKlass::ciKlass
//
// Nameless klass variant.
ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {
  assert(get_Klass()->is_klass(), "wrong type");
  _name = name;
  _layout_helper = Klass::_lh_neutral_value;
}

// ------------------------------------------------------------------
// ciKlass::ciKlass
//
// Unloaded klass variant.
ciKlass::ciKlass(ciSymbol* name, BasicType bt) : ciType(bt) {
  _name = name;
  _layout_helper = Klass::_lh_neutral_value;
}

// ------------------------------------------------------------------
// ciKlass::is_subtype_of
bool ciKlass::is_subtype_of(ciKlass* that) {
  assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
  assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));

  // Check to see if the klasses are identical.
  if (this == that) {
    return true;
  }

  VM_ENTRY_MARK;
  Klass* this_klass = get_Klass();
  Klass* that_klass = that->get_Klass();
  bool result = this_klass->is_subtype_of(that_klass);

  return result;
}

// ------------------------------------------------------------------
// ciKlass::is_subclass_of
bool ciKlass::is_subclass_of(ciKlass* that) {
  assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
  assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));

  VM_ENTRY_MARK;
  Klass* this_klass = get_Klass();
  Klass* that_klass = that->get_Klass();
  bool result = this_klass->is_subclass_of(that_klass);

  return result;
}

// ------------------------------------------------------------------
// ciKlass::super_depth
juint ciKlass::super_depth() {
  assert(is_loaded(), "must be loaded");

  VM_ENTRY_MARK;
  Klass* this_klass = get_Klass();
  return this_klass->super_depth();
}

// ------------------------------------------------------------------
// ciKlass::super_check_offset
juint ciKlass::super_check_offset() {
  assert(is_loaded(), "must be loaded");

  VM_ENTRY_MARK;
  Klass* this_klass = get_Klass();
  return this_klass->super_check_offset();
}

// ------------------------------------------------------------------
// ciKlass::super_of_depth
ciKlass* ciKlass::super_of_depth(juint i) {
  assert(is_loaded(), "must be loaded");

  VM_ENTRY_MARK;
  Klass* this_klass = get_Klass();
  Klass* super = this_klass->primary_super_of_depth(i);
  return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL;
}

// ------------------------------------------------------------------
// ciKlass::can_be_primary_super
bool ciKlass::can_be_primary_super() {
  assert(is_loaded(), "must be loaded");

  VM_ENTRY_MARK;
  Klass* this_klass = get_Klass();
  return this_klass->can_be_primary_super();
}

// ------------------------------------------------------------------
// ciKlass::least_common_ancestor
//
// Get the shared parent of two klasses.
//
// Implementation note: this method currently goes "over the wall"
// and does all of the work on the VM side.  It could be rewritten
// to use the super() method and do all of the work (aside from the
// lazy computation of super()) in native mode.  This may be
// worthwhile if the compiler is repeatedly requesting the same lca
// computation or possibly if most of the superklasses have already
// been created as ciObjects anyway.  Something to think about...
ciKlass*
ciKlass::least_common_ancestor(ciKlass* that) {
  assert(is_loaded() && that->is_loaded(), "must be loaded");
  // Check to see if the klasses are identical.
  if (this == that) {
    return this;
  }

  VM_ENTRY_MARK;
  Klass* this_klass = get_Klass();
  Klass* that_klass = that->get_Klass();
  Klass* lca        = this_klass->LCA(that_klass);

  // Many times the LCA will be either this_klass or that_klass.
  // Treat these as special cases.
  if (lca == that_klass) {
    return that;
  }
  if (this_klass == lca) {
    return this;
  }

  // Create the ciInstanceKlass for the lca.
  ciKlass* result =
    CURRENT_THREAD_ENV->get_klass(lca);

  return result;
}

// ------------------------------------------------------------------
// ciKlass::find_klass
//
// Find a klass using this klass's class loader.
ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {
  assert(is_loaded(), "cannot find_klass through an unloaded klass");
  return CURRENT_ENV->get_klass_by_name(this,
                                        klass_name, false);
}

// ------------------------------------------------------------------
// ciKlass::java_mirror
//
// Get the instance of java.lang.Class corresponding to this klass.
// If it is an unloaded instance or array klass, return an unloaded
// mirror object of type Class.
ciInstance* ciKlass::java_mirror() {
  GUARDED_VM_ENTRY(
    if (!is_loaded())
      return ciEnv::current()->get_unloaded_klass_mirror(this);
    oop java_mirror = get_Klass()->java_mirror();
    return CURRENT_ENV->get_instance(java_mirror);
  )
}

// ------------------------------------------------------------------
// ciKlass::modifier_flags
jint ciKlass::modifier_flags() {
  assert(is_loaded(), "not loaded");
  GUARDED_VM_ENTRY(
    return get_Klass()->modifier_flags();
  )
}

// ------------------------------------------------------------------
// ciKlass::access_flags
jint ciKlass::access_flags() {
  assert(is_loaded(), "not loaded");
  GUARDED_VM_ENTRY(
    return get_Klass()->access_flags().as_int();
  )
}

// ------------------------------------------------------------------
// ciKlass::print_impl
//
// Implementation of the print method
void ciKlass::print_impl(outputStream* st) {
  st->print(" name=");
  print_name_on(st);
}

// ------------------------------------------------------------------
// ciKlass::print_name
//
// Print the name of this klass
void ciKlass::print_name_on(outputStream* st) {
  name()->print_symbol_on(st);
}

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