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Java example source code file (oop.cpp)

This example Java source code file (oop.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

althashing\:\:murmur3_32, barrierset, entry, exception_mark, handlemark, leaf\/quick, might, null, oom_malloc_error, printoopaddress, resourcemark, string, verifyoopclosure::do_oop, verifyoopclosure::do_oop_work

The oop.cpp Java example source code

/*
 * Copyright (c) 1997, 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 "classfile/altHashing.hpp"
#include "classfile/javaClasses.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/thread.inline.hpp"
#include "utilities/copy.hpp"

bool always_do_update_barrier = false;

BarrierSet* oopDesc::_bs = NULL;

void oopDesc::print_on(outputStream* st) const {
  if (this == NULL) {
    st->print_cr("NULL");
  } else {
    klass()->oop_print_on(oop(this), st);
  }
}

void oopDesc::print_address_on(outputStream* st) const {
  if (PrintOopAddress) {
    st->print("{"INTPTR_FORMAT"}", this);
  }
}

void oopDesc::print()         { print_on(tty);         }

void oopDesc::print_address() { print_address_on(tty); }

char* oopDesc::print_string() {
  stringStream st;
  print_on(&st);
  return st.as_string();
}

void oopDesc::print_value() {
  print_value_on(tty);
}

char* oopDesc::print_value_string() {
  char buf[100];
  stringStream st(buf, sizeof(buf));
  print_value_on(&st);
  return st.as_string();
}

void oopDesc::print_value_on(outputStream* st) const {
  oop obj = oop(this);
  if (this == NULL) {
    st->print("NULL");
  } else if (java_lang_String::is_instance(obj)) {
    java_lang_String::print(obj, st);
    if (PrintOopAddress) print_address_on(st);
  } else {
    klass()->oop_print_value_on(obj, st);
  }
}


void oopDesc::verify_on(outputStream* st) {
  if (this != NULL) {
    klass()->oop_verify_on(this, st);
  }
}


void oopDesc::verify() {
  verify_on(tty);
}

intptr_t oopDesc::slow_identity_hash() {
  // slow case; we have to acquire the micro lock in order to locate the header
  ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
  HandleMark hm;
  Handle object(this);
  return ObjectSynchronizer::identity_hash_value_for(object);
}

// When String table needs to rehash
unsigned int oopDesc::new_hash(jint seed) {
  EXCEPTION_MARK;
  ResourceMark rm;
  int length;
  jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
  if (chars != NULL) {
    // Use alternate hashing algorithm on the string
    return AltHashing::murmur3_32(seed, chars, length);
  } else {
    vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
    return 0;
  }
}

VerifyOopClosure VerifyOopClosure::verify_oop;

void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }

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