/*

 * Copyright (c) 1997, 2017, 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.inline.hpp"

#include "memory/resourceArea.hpp"

#include "oops/oop.inline.hpp"

#include "oops/verifyOopClosure.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/thread.inline.hpp"

#include "utilities/copy.hpp"

#if INCLUDE_ALL_GCS

#include "gc/g1/g1Allocator.inline.hpp"

#endif

bool always_do_update_barrier = false;

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 {

  st->print("{" INTPTR_FORMAT "}", p2i(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);

    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

  Thread* THREAD = Thread::current();

  ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY

  HandleMark hm(THREAD);

  Handle object(THREAD, this);

  return ObjectSynchronizer::identity_hash_value_for(object);

}

// When String table needs to rehash

unsigned int oopDesc::new_hash(juint 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;

  }

}

// used only for asserts and guarantees

bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {

  if (!check_obj_alignment(obj)) return false;

  if (!Universe::heap()->is_in_reserved(obj)) return false;

  // obj is aligned and accessible in heap

  if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;

  // Header verification: the mark is typically non-NULL. If we're

  // at a safepoint, it must not be null.

  // Outside of a safepoint, the header could be changing (for example,

  // another thread could be inflating a lock on this object).

  if (ignore_mark_word) {

    return true;

  }

  if (obj->mark() != NULL) {

    return true;

  }

  return !SafepointSynchronize::is_at_safepoint();

}

// used only for asserts and guarantees

bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {

  return obj == NULL ? true : is_oop(obj, ignore_mark_word);

}

#ifndef PRODUCT

// used only for asserts

bool oopDesc::is_unlocked_oop() const {

  if (!Universe::heap()->is_in_reserved(this)) return false;

  return mark()->is_unlocked();

}

#endif // PRODUCT

VerifyOopClosure VerifyOopClosure::verify_oop;

template <class T> void VerifyOopClosure::do_oop_work(T* p) {

  oop obj = oopDesc::load_decode_heap_oop(p);

  guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));

}

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

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

// type test operations that doesn't require inclusion of oop.inline.hpp.

bool oopDesc::is_instance_noinline()          const { return is_instance();            }

bool oopDesc::is_array_noinline()             const { return is_array();               }

bool oopDesc::is_objArray_noinline()          const { return is_objArray();            }

bool oopDesc::is_typeArray_noinline()         const { return is_typeArray();           }

bool oopDesc::has_klass_gap() {

  // Only has a klass gap when compressed class pointers are used.

  return UseCompressedClassPointers;

}

oop oopDesc::obj_field_acquire(int offset) const                      { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }

void oopDesc::obj_field_put_raw(int offset, oop value)                { RawAccess<>::oop_store_at(as_oop(), offset, value); }

void oopDesc::release_obj_field_put(int offset, oop value)            { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }

void oopDesc::obj_field_put_volatile(int offset, oop value)           { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }

address oopDesc::address_field(int offset) const                      { return HeapAccess<>::load_at(as_oop(), offset); }

address oopDesc::address_field_acquire(int offset) const              { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::address_field_put(int offset, address value)            { HeapAccess<>::store_at(as_oop(), offset, value); }

void oopDesc::release_address_field_put(int offset, address value)    { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

Metadata* oopDesc::metadata_field(int offset) const                   { return HeapAccess<>::load_at(as_oop(), offset); }

void oopDesc::metadata_field_put(int offset, Metadata* value)         { HeapAccess<>::store_at(as_oop(), offset, value); }

Metadata* oopDesc::metadata_field_acquire(int offset) const           { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

jbyte oopDesc::byte_field_acquire(int offset) const                   { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_byte_field_put(int offset, jbyte value)         { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

jchar oopDesc::char_field_acquire(int offset) const                   { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_char_field_put(int offset, jchar value)         { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

jboolean oopDesc::bool_field_acquire(int offset) const                { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_bool_field_put(int offset, jboolean value)      { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }

jint oopDesc::int_field_acquire(int offset) const                     { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_int_field_put(int offset, jint value)           { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

jshort oopDesc::short_field_acquire(int offset) const                 { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_short_field_put(int offset, jshort value)       { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

jlong oopDesc::long_field_acquire(int offset) const                   { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_long_field_put(int offset, jlong value)         { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

jfloat oopDesc::float_field_acquire(int offset) const                 { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_float_field_put(int offset, jfloat value)       { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

jdouble oopDesc::double_field_acquire(int offset) const               { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }

void oopDesc::release_double_field_put(int offset, jdouble value)     { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }

#if INCLUDE_CDS_JAVA_HEAP

bool oopDesc::is_archive_object(oop p) {

  return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p);

}

#endif