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src/hotspot/share/oops/oop.cpp

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 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/compressedOops.inline.hpp"
 34 #include "oops/oop.inline.hpp"
 35 #include "oops/verifyOopClosure.hpp"
 36 #include "runtime/handles.inline.hpp"

 37 #include "runtime/javaThread.hpp"
 38 #include "runtime/synchronizer.hpp"
 39 #include "utilities/macros.hpp"
 40 
 41 void oopDesc::print_on(outputStream* st) const {
 42   if (*((juint*)this) == badHeapWordVal) {
 43     st->print_cr("BAD WORD");
 44   } else if (*((juint*)this) == badMetaWordVal) {
 45     st->print_cr("BAD META WORD");
 46   } else {
 47     klass()->oop_print_on(cast_to_oop(this), st);
 48   }
 49 }
 50 
 51 void oopDesc::print_address_on(outputStream* st) const {
 52   st->print("{" PTR_FORMAT "}", p2i(this));
 53 
 54 }
 55 
 56 void oopDesc::print_name_on(outputStream* st) const {

138 
139 VerifyOopClosure VerifyOopClosure::verify_oop;
140 
141 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
142   oop obj = RawAccess<>::oop_load(p);
143   guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " PTR_FORMAT, p2i(obj));
144 }
145 
146 void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
147 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
148 
149 // type test operations that doesn't require inclusion of oop.inline.hpp.
150 bool oopDesc::is_instance_noinline()    const { return is_instance();    }
151 bool oopDesc::is_instanceRef_noinline() const { return is_instanceRef(); }
152 bool oopDesc::is_stackChunk_noinline()  const { return is_stackChunk();  }
153 bool oopDesc::is_array_noinline()       const { return is_array();       }
154 bool oopDesc::is_objArray_noinline()    const { return is_objArray();    }
155 bool oopDesc::is_typeArray_noinline()   const { return is_typeArray();   }
156 
157 bool oopDesc::has_klass_gap() {
158   // Only has a klass gap when compressed class pointers are used.
159   return UseCompressedClassPointers;

160 }
161 
162 #if INCLUDE_CDS_JAVA_HEAP
163 void oopDesc::set_narrow_klass(narrowKlass nk) {
164   assert(DumpSharedSpaces, "Used by CDS only. Do not abuse!");
165   assert(UseCompressedClassPointers, "must be");
166   _metadata._compressed_klass = nk;




167 }
168 #endif
169 
170 void* oopDesc::load_klass_raw(oop obj) {
171   if (UseCompressedClassPointers) {
172     narrowKlass narrow_klass = obj->_metadata._compressed_klass;
173     if (narrow_klass == 0) return nullptr;
174     return (void*)CompressedKlassPointers::decode_raw(narrow_klass);
175   } else {
176     return obj->_metadata._klass;
177   }

178 }
179 
180 void* oopDesc::load_oop_raw(oop obj, int offset) {
181   uintptr_t addr = (uintptr_t)(void*)obj + (uint)offset;
182   if (UseCompressedOops) {
183     narrowOop narrow_oop = *(narrowOop*)addr;
184     if (CompressedOops::is_null(narrow_oop)) return nullptr;
185     return (void*)CompressedOops::decode_raw(narrow_oop);
186   } else {
187     return *(void**)addr;
188   }
189 }
190 
191 oop oopDesc::obj_field_acquire(int offset) const                      { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
192 
193 void oopDesc::obj_field_put_raw(int offset, oop value)                { RawAccess<>::oop_store_at(as_oop(), offset, value); }
194 void oopDesc::release_obj_field_put(int offset, oop value)            { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
195 void oopDesc::obj_field_put_volatile(int offset, oop value)           { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
196 
197 address oopDesc::address_field(int offset) const                      { return *field_addr<address>(offset); }

 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/javaThread.hpp"
 40 #include "runtime/synchronizer.hpp"
 41 #include "utilities/macros.hpp"
 42 
 43 void oopDesc::print_on(outputStream* st) const {
 44   if (*((juint*)this) == badHeapWordVal) {
 45     st->print_cr("BAD WORD");
 46   } else if (*((juint*)this) == badMetaWordVal) {
 47     st->print_cr("BAD META WORD");
 48   } else {
 49     klass()->oop_print_on(cast_to_oop(this), st);
 50   }
 51 }
 52 
 53 void oopDesc::print_address_on(outputStream* st) const {
 54   st->print("{" PTR_FORMAT "}", p2i(this));
 55 
 56 }
 57 
 58 void oopDesc::print_name_on(outputStream* st) const {

140 
141 VerifyOopClosure VerifyOopClosure::verify_oop;
142 
143 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
144   oop obj = RawAccess<>::oop_load(p);
145   guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " PTR_FORMAT, p2i(obj));
146 }
147 
148 void VerifyOopClosure::do_oop(oop* p)       { VerifyOopClosure::do_oop_work(p); }
149 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
150 
151 // type test operations that doesn't require inclusion of oop.inline.hpp.
152 bool oopDesc::is_instance_noinline()    const { return is_instance();    }
153 bool oopDesc::is_instanceRef_noinline() const { return is_instanceRef(); }
154 bool oopDesc::is_stackChunk_noinline()  const { return is_stackChunk();  }
155 bool oopDesc::is_array_noinline()       const { return is_array();       }
156 bool oopDesc::is_objArray_noinline()    const { return is_objArray();    }
157 bool oopDesc::is_typeArray_noinline()   const { return is_typeArray();   }
158 
159 bool oopDesc::has_klass_gap() {
160   // Only has a klass gap when compressed class pointers are used, but
161   // only if not using compact headers..
162   return UseCompressedClassPointers && !UseCompactObjectHeaders;
163 }
164 
165 #if INCLUDE_CDS_JAVA_HEAP
166 void oopDesc::set_narrow_klass(narrowKlass nk) {
167   assert(DumpSharedSpaces, "Used by CDS only. Do not abuse!");
168   assert(UseCompressedClassPointers, "must be");
169   if (UseCompactObjectHeaders) {
170     set_mark(mark().set_narrow_klass(nk));
171   } else {
172     _metadata._compressed_klass = nk;
173   }
174 }
175 #endif
176 
177 void* oopDesc::load_klass_raw(oop obj) {
178   // TODO: Remove method altogether and replace with calls to obj->klass() ?
179   // OTOH, we may eventually get rid of locking in header, and then no
180   // longer have to deal with that anymore.
181 #ifdef _LP64
182   return obj->klass();
183 #else
184   return obj->_metadata._klass;
185 #endif
186 }
187 
188 void* oopDesc::load_oop_raw(oop obj, int offset) {
189   uintptr_t addr = (uintptr_t)(void*)obj + (uint)offset;
190   if (UseCompressedOops) {
191     narrowOop narrow_oop = *(narrowOop*)addr;
192     if (CompressedOops::is_null(narrow_oop)) return nullptr;
193     return (void*)CompressedOops::decode_raw(narrow_oop);
194   } else {
195     return *(void**)addr;
196   }
197 }
198 
199 oop oopDesc::obj_field_acquire(int offset) const                      { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
200 
201 void oopDesc::obj_field_put_raw(int offset, oop value)                { RawAccess<>::oop_store_at(as_oop(), offset, value); }
202 void oopDesc::release_obj_field_put(int offset, oop value)            { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
203 void oopDesc::obj_field_put_volatile(int offset, oop value)           { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
204 
205 address oopDesc::address_field(int offset) const                      { return *field_addr<address>(offset); }
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