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 35 bool always_do_update_barrier = false; 36 37 BarrierSet* oopDesc::_bs = NULL; 38 39 void oopDesc::print_on(outputStream* st) const { 40 if (this == NULL) { 41 st->print_cr("NULL"); 42 } else { 43 klass()->oop_print_on(oop(this), st); 44 } 45 } 46 47 void oopDesc::print_address_on(outputStream* st) const { 48 st->print("{" INTPTR_FORMAT "}", p2i(this)); 49 50 } 51 52 void oopDesc::print() { print_on(tty); } 53 54 void oopDesc::print_address() { print_address_on(tty); } 55 56 char* oopDesc::print_string() { 57 stringStream st; 58 print_on(&st); 59 return st.as_string(); 60 } 61 62 void oopDesc::print_value() { 63 print_value_on(tty); 64 } 65 66 char* oopDesc::print_value_string() { 67 char buf[100]; 68 stringStream st(buf, sizeof(buf)); 69 print_value_on(&st); 70 return st.as_string(); 71 } 72 73 void oopDesc::print_value_on(outputStream* st) const { 74 oop obj = oop(this); 75 if (this == NULL) { 76 st->print("NULL"); 77 } else if (java_lang_String::is_instance(obj)) { 78 java_lang_String::print(obj, st); 79 print_address_on(st); 80 } else { 81 klass()->oop_print_value_on(obj, st); 82 } 83 } 84 85 86 void oopDesc::verify_on(outputStream* st) { 87 if (this != NULL) { 88 klass()->oop_verify_on(this, st); 89 } 90 } 91 92 93 void oopDesc::verify() { 94 verify_on(tty); 95 } 96 97 intptr_t oopDesc::slow_identity_hash() { 98 // slow case; we have to acquire the micro lock in order to locate the header 99 Thread* THREAD = Thread::current(); 100 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 101 HandleMark hm(THREAD); 102 Handle object(THREAD, this); 103 return ObjectSynchronizer::identity_hash_value_for(object); 104 } 105 106 // When String table needs to rehash 107 unsigned int oopDesc::new_hash(juint seed) { 108 EXCEPTION_MARK; 109 ResourceMark rm; 110 int length; 111 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD); 112 if (chars != NULL) { 113 // Use alternate hashing algorithm on the string 114 return AltHashing::murmur3_32(seed, chars, length); 115 } else { 116 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash"); 117 return 0; 118 } 119 } 120 121 VerifyOopClosure VerifyOopClosure::verify_oop; 122 123 template <class T> void VerifyOopClosure::do_oop_work(T* p) { 124 oop obj = oopDesc::load_decode_heap_oop(p); 125 guarantee(obj->is_oop_or_null(), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)); 126 } 127 128 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); } 129 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); } 130 131 // type test operations that doesn't require inclusion of oop.inline.hpp. 132 bool oopDesc::is_instance_noinline() const { return is_instance(); } 133 bool oopDesc::is_array_noinline() const { return is_array(); } 134 bool oopDesc::is_objArray_noinline() const { return is_objArray(); } 135 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); } 136 137 bool oopDesc::has_klass_gap() { 138 // Only has a klass gap when compressed class pointers are used. 139 return UseCompressedClassPointers; 140 }