1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/altHashing.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "memory/resourceArea.hpp" 29 #include "oops/oop.inline.hpp" 30 #include "oops/verifyOopClosure.hpp" 31 #include "runtime/handles.inline.hpp" 32 #include "runtime/thread.inline.hpp" 33 #include "utilities/copy.hpp" 34 #if INCLUDE_ALL_GCS 35 #include "gc/g1/g1Allocator.inline.hpp" 36 #endif 37 38 bool always_do_update_barrier = false; 39 40 BarrierSet* oopDesc::_bs = NULL; 41 42 void oopDesc::print_on(outputStream* st) const { 43 if (this == NULL) { 44 st->print_cr("NULL"); 45 } else { 46 klass()->oop_print_on(oop(this), st); 47 } 48 } 49 50 void oopDesc::print_address_on(outputStream* st) const { 51 st->print("{" INTPTR_FORMAT "}", p2i(this)); 52 53 } 54 55 void oopDesc::print() { print_on(tty); } 56 57 void oopDesc::print_address() { print_address_on(tty); } 58 59 char* oopDesc::print_string() { 60 stringStream st; 61 print_on(&st); 62 return st.as_string(); 63 } 64 65 void oopDesc::print_value() { 66 print_value_on(tty); 67 } 68 69 char* oopDesc::print_value_string() { 70 char buf[100]; 71 stringStream st(buf, sizeof(buf)); 72 print_value_on(&st); 73 return st.as_string(); 74 } 75 76 void oopDesc::print_value_on(outputStream* st) const { 77 oop obj = oop(this); 78 if (this == NULL) { 79 st->print("NULL"); 80 } else if (java_lang_String::is_instance(obj)) { 81 java_lang_String::print(obj, st); 82 print_address_on(st); 83 } else { 84 klass()->oop_print_value_on(obj, st); 85 } 86 } 87 88 89 void oopDesc::verify_on(outputStream* st) { 90 if (this != NULL) { 91 klass()->oop_verify_on(this, st); 92 } 93 } 94 95 96 void oopDesc::verify() { 97 verify_on(tty); 98 } 99 100 intptr_t oopDesc::slow_identity_hash() { 101 // slow case; we have to acquire the micro lock in order to locate the header 102 Thread* THREAD = Thread::current(); 103 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 104 HandleMark hm(THREAD); 105 Handle object(THREAD, this); 106 return ObjectSynchronizer::identity_hash_value_for(object); 107 } 108 109 // When String table needs to rehash 110 unsigned int oopDesc::new_hash(juint seed) { 111 EXCEPTION_MARK; 112 ResourceMark rm; 113 int length; 114 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD); 115 if (chars != NULL) { 116 // Use alternate hashing algorithm on the string 117 return AltHashing::murmur3_32(seed, chars, length); 118 } else { 119 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash"); 120 return 0; 121 } 122 } 123 124 VerifyOopClosure VerifyOopClosure::verify_oop; 125 126 template <class T> void VerifyOopClosure::do_oop_work(T* p) { 127 oop obj = oopDesc::load_decode_heap_oop(p); 128 guarantee(obj->is_oop_or_null(), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); 129 } 130 131 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } 132 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } 133 134 // type test operations that doesn't require inclusion of oop.inline.hpp. 135 bool oopDesc::is_instance_noinline() const { return is_instance(); } 136 bool oopDesc::is_array_noinline() const { return is_array(); } 137 bool oopDesc::is_objArray_noinline() const { return is_objArray(); } 138 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } 139 140 bool oopDesc::has_klass_gap() { 141 // Only has a klass gap when compressed class pointers are used. 142 return UseCompressedClassPointers; 143 } 144 145 #if INCLUDE_CDS_JAVA_HEAP 146 bool oopDesc::is_archive_object(oop p) { 147 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p); 148 } 149 #endif