author | coleenp |
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/* |
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* Copyright (c) 1997, 2017, 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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#include "precompiled.hpp" |
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#include "classfile/altHashing.hpp" |
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#include "classfile/javaClasses.inline.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "oops/verifyOopClosure.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "utilities/copy.hpp" |
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#if INCLUDE_ALL_GCS |
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#include "gc/g1/g1Allocator.inline.hpp" |
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#endif |
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bool always_do_update_barrier = false; |
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BarrierSet* oopDesc::_bs = NULL; |
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void oopDesc::print_on(outputStream* st) const { |
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if (this == NULL) { |
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st->print_cr("NULL"); |
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} else { |
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klass()->oop_print_on(oop(this), st); |
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} |
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} |
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void oopDesc::print_address_on(outputStream* st) const { |
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st->print("{" INTPTR_FORMAT "}", p2i(this)); |
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} |
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void oopDesc::print() { print_on(tty); } |
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void oopDesc::print_address() { print_address_on(tty); } |
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char* oopDesc::print_string() { |
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stringStream st; |
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print_on(&st); |
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return st.as_string(); |
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} |
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void oopDesc::print_value() { |
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print_value_on(tty); |
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} |
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char* oopDesc::print_value_string() { |
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char buf[100]; |
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stringStream st(buf, sizeof(buf)); |
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print_value_on(&st); |
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return st.as_string(); |
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} |
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void oopDesc::print_value_on(outputStream* st) const { |
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oop obj = oop(this); |
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if (this == NULL) { |
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st->print("NULL"); |
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} else if (java_lang_String::is_instance(obj)) { |
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java_lang_String::print(obj, st); |
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print_address_on(st); |
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} else { |
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klass()->oop_print_value_on(obj, st); |
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} |
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} |
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void oopDesc::verify_on(outputStream* st) { |
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if (this != NULL) { |
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klass()->oop_verify_on(this, st); |
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} |
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} |
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void oopDesc::verify() { |
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verify_on(tty); |
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} |
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intptr_t oopDesc::slow_identity_hash() { |
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// slow case; we have to acquire the micro lock in order to locate the header |
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Thread* THREAD = Thread::current(); |
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ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY |
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HandleMark hm(THREAD); |
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Handle object(THREAD, this); |
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return ObjectSynchronizer::identity_hash_value_for(object); |
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} |
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// When String table needs to rehash |
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unsigned int oopDesc::new_hash(juint seed) { |
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EXCEPTION_MARK; |
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ResourceMark rm; |
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int length; |
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jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD); |
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if (chars != NULL) { |
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// Use alternate hashing algorithm on the string |
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return AltHashing::murmur3_32(seed, chars, length); |
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} else { |
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vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash"); |
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return 0; |
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} |
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} |
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// used only for asserts and guarantees |
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bool oopDesc::is_oop(oop obj, bool ignore_mark_word) { |
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if (!check_obj_alignment(obj)) return false; |
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if (!Universe::heap()->is_in_reserved(obj)) return false; |
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// obj is aligned and accessible in heap |
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if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false; |
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// Header verification: the mark is typically non-NULL. If we're |
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// at a safepoint, it must not be null. |
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// Outside of a safepoint, the header could be changing (for example, |
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// another thread could be inflating a lock on this object). |
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if (ignore_mark_word) { |
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return true; |
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} |
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if (obj->mark() != NULL) { |
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return true; |
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} |
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return !SafepointSynchronize::is_at_safepoint(); |
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} |
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// used only for asserts and guarantees |
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bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) { |
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return obj == NULL ? true : is_oop(obj, ignore_mark_word); |
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} |
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#ifndef PRODUCT |
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// used only for asserts |
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bool oopDesc::is_unlocked_oop() const { |
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if (!Universe::heap()->is_in_reserved(this)) return false; |
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return mark()->is_unlocked(); |
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} |
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#endif // PRODUCT |
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VerifyOopClosure VerifyOopClosure::verify_oop; |
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template <class T> void VerifyOopClosure::do_oop_work(T* p) { |
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oop obj = oopDesc::load_decode_heap_oop(p); |
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guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); |
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} |
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void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } |
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void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } |
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// type test operations that doesn't require inclusion of oop.inline.hpp. |
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bool oopDesc::is_instance_noinline() const { return is_instance(); } |
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bool oopDesc::is_array_noinline() const { return is_array(); } |
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bool oopDesc::is_objArray_noinline() const { return is_objArray(); } |
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bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } |
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bool oopDesc::has_klass_gap() { |
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// Only has a klass gap when compressed class pointers are used. |
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return UseCompressedClassPointers; |
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} |
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#if INCLUDE_CDS_JAVA_HEAP |
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bool oopDesc::is_archive_object(oop p) { |
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return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p); |
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} |
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#endif |