1 /*
  2  * Copyright (c) 1997, 2021, 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 "gc/shared/collectedHeap.inline.hpp"
 29 #include "gc/shared/gc_globals.hpp"
 30 #include "memory/resourceArea.hpp"
 31 #include "memory/universe.hpp"
 32 #include "oops/access.inline.hpp"
 33 #include "oops/compressedKlass.inline.hpp"
 34 #include "oops/compressedOops.inline.hpp"
 35 #include "oops/oop.inline.hpp"
 36 #include "oops/verifyOopClosure.hpp"
 37 #include "runtime/handles.inline.hpp"
 38 #include "runtime/interfaceSupport.inline.hpp"
 39 #include "runtime/thread.inline.hpp"
 40 #include "utilities/copy.hpp"
 41 #include "utilities/macros.hpp"
 42 
 43 void oopDesc::print_on(outputStream* st) const {
 44   klass()->oop_print_on(const_cast<oopDesc*>(this), st);
 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 = const_cast<oopDesc*>(this);
 75   if (java_lang_String::is_instance(obj)) {
 76     java_lang_String::print(obj, st);
 77     print_address_on(st);
 78   } else {
 79     klass()->oop_print_value_on(obj, st);
 80   }
 81 }
 82 
 83 
 84 void oopDesc::verify_on(outputStream* st, oopDesc* oop_desc) {
 85   if (oop_desc != NULL) {
 86     oop_desc->klass()->oop_verify_on(oop_desc, st);
 87   }
 88 }
 89 
 90 
 91 void oopDesc::verify(oopDesc* oop_desc) {
 92   verify_on(tty, oop_desc);
 93 }
 94 
 95 intptr_t oopDesc::slow_identity_hash() {
 96   // slow case; we have to acquire the micro lock in order to locate the header
 97   Thread* current = Thread::current();
 98   ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
 99   HandleMark hm(current);
100   Handle object(current, this);
101   return ObjectSynchronizer::identity_hash_value_for(object);
102 }
103 
104 // used only for asserts and guarantees
105 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
106   if (!Universe::heap()->is_oop(obj)) {
107     return false;
108   }
109 
110   // Header verification: the mark is typically non-zero. If we're
111   // at a safepoint, it must not be zero.
112   // Outside of a safepoint, the header could be changing (for example,
113   // another thread could be inflating a lock on this object).
114   if (ignore_mark_word) {
115     return true;
116   }
117   if (obj->mark().value() != 0) {
118     return true;
119   }
120   return !SafepointSynchronize::is_at_safepoint();
121 }
122 
123 // used only for asserts and guarantees
124 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
125   return obj == NULL ? true : is_oop(obj, ignore_mark_word);
126 }
127 
128 VerifyOopClosure VerifyOopClosure::verify_oop;
129 
130 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
131   oop obj = RawAccess<>::oop_load(p);
132   guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
133 }
134 
135 void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
136 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
137 
138 // type test operations that doesn't require inclusion of oop.inline.hpp.
139 bool oopDesc::is_instance_noinline()          const { return is_instance();            }
140 bool oopDesc::is_array_noinline()             const { return is_array();               }
141 bool oopDesc::is_objArray_noinline()          const { return is_objArray();            }
142 bool oopDesc::is_typeArray_noinline()         const { return is_typeArray();           }
143 
144 bool oopDesc::has_klass_gap() {
145   // Only has a klass gap when compressed class pointers are used.
146   return UseCompressedClassPointers;
147 }
148 
149 #if INCLUDE_CDS_JAVA_HEAP
150 void oopDesc::set_narrow_klass(narrowKlass nk) {
151   assert(DumpSharedSpaces, "Used by CDS only. Do not abuse!");
152   assert(UseCompressedClassPointers, "must be");
153   _metadata._compressed_klass = nk;
154 }
155 #endif
156 
157 void* oopDesc::load_klass_raw(oop obj) {
158   if (UseCompressedClassPointers) {
159     narrowKlass narrow_klass = obj->_metadata._compressed_klass;
160     if (narrow_klass == 0) return NULL;
161     return (void*)CompressedKlassPointers::decode_raw(narrow_klass);
162   } else {
163     return obj->_metadata._klass;
164   }
165 }
166 
167 void* oopDesc::load_oop_raw(oop obj, int offset) {
168   uintptr_t addr = (uintptr_t)(void*)obj + (uint)offset;
169   if (UseCompressedOops) {
170     narrowOop narrow_oop = *(narrowOop*)addr;
171     if (CompressedOops::is_null(narrow_oop)) return NULL;
172     return (void*)CompressedOops::decode_raw(narrow_oop);
173   } else {
174     return *(void**)addr;
175   }
176 }
177 
178 JRT_LEAF(Klass*, oopDesc::load_klass_runtime(oopDesc* o))
179   assert(o != NULL, "null-check");
180   oop obj = oop(o);
181   assert(oopDesc::is_oop(obj), "need a valid oop here: " PTR_FORMAT, p2i(o));
182   return obj->klass();
183 JRT_END
184 
185 oop oopDesc::obj_field_acquire(int offset) const                      { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
186 
187 void oopDesc::obj_field_put_raw(int offset, oop value)                { RawAccess<>::oop_store_at(as_oop(), offset, value); }
188 void oopDesc::release_obj_field_put(int offset, oop value)            { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
189 void oopDesc::obj_field_put_volatile(int offset, oop value)           { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
190 
191 address oopDesc::address_field(int offset) const                      { return *field_addr<address>(offset); }
192 address oopDesc::address_field_acquire(int offset) const              { return Atomic::load_acquire(field_addr<address>(offset)); }
193 
194 void oopDesc::address_field_put(int offset, address value)            { *field_addr<address>(offset) = value; }
195 void oopDesc::release_address_field_put(int offset, address value)    { Atomic::release_store(field_addr<address>(offset), value); }
196 
197 Metadata* oopDesc::metadata_field(int offset) const                   { return *field_addr<Metadata*>(offset); }
198 void oopDesc::metadata_field_put(int offset, Metadata* value)         { *field_addr<Metadata*>(offset) = value; }
199 
200 Metadata* oopDesc::metadata_field_acquire(int offset) const           { return Atomic::load_acquire(field_addr<Metadata*>(offset)); }
201 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { Atomic::release_store(field_addr<Metadata*>(offset), value); }
202 
203 jbyte oopDesc::byte_field_acquire(int offset) const                   { return Atomic::load_acquire(field_addr<jbyte>(offset)); }
204 void oopDesc::release_byte_field_put(int offset, jbyte value)         { Atomic::release_store(field_addr<jbyte>(offset), value); }
205 
206 jchar oopDesc::char_field_acquire(int offset) const                   { return Atomic::load_acquire(field_addr<jchar>(offset)); }
207 void oopDesc::release_char_field_put(int offset, jchar value)         { Atomic::release_store(field_addr<jchar>(offset), value); }
208 
209 jboolean oopDesc::bool_field_acquire(int offset) const                { return Atomic::load_acquire(field_addr<jboolean>(offset)); }
210 void oopDesc::release_bool_field_put(int offset, jboolean value)      { Atomic::release_store(field_addr<jboolean>(offset), jboolean(value & 1)); }
211 
212 jint oopDesc::int_field_acquire(int offset) const                     { return Atomic::load_acquire(field_addr<jint>(offset)); }
213 void oopDesc::release_int_field_put(int offset, jint value)           { Atomic::release_store(field_addr<jint>(offset), value); }
214 
215 jshort oopDesc::short_field_acquire(int offset) const                 { return Atomic::load_acquire(field_addr<jshort>(offset)); }
216 void oopDesc::release_short_field_put(int offset, jshort value)       { Atomic::release_store(field_addr<jshort>(offset), value); }
217 
218 jlong oopDesc::long_field_acquire(int offset) const                   { return Atomic::load_acquire(field_addr<jlong>(offset)); }
219 void oopDesc::release_long_field_put(int offset, jlong value)         { Atomic::release_store(field_addr<jlong>(offset), value); }
220 
221 jfloat oopDesc::float_field_acquire(int offset) const                 { return Atomic::load_acquire(field_addr<jfloat>(offset)); }
222 void oopDesc::release_float_field_put(int offset, jfloat value)       { Atomic::release_store(field_addr<jfloat>(offset), value); }
223 
224 jdouble oopDesc::double_field_acquire(int offset) const               { return Atomic::load_acquire(field_addr<jdouble>(offset)); }
225 void oopDesc::release_double_field_put(int offset, jdouble value)     { Atomic::release_store(field_addr<jdouble>(offset), value); }
226 
227 #ifdef ASSERT
228 void oopDesc::verify_forwardee(oop forwardee) {
229 #if INCLUDE_CDS_JAVA_HEAP
230   assert(!Universe::heap()->is_archived_object(forwardee) && !Universe::heap()->is_archived_object(this),
231          "forwarding archive object");
232 #endif
233 }
234 
235 bool oopDesc::get_UseParallelGC() { return UseParallelGC; }
236 bool oopDesc::get_UseG1GC()       { return UseG1GC;       }
237 #endif
--- EOF ---