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 #ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP 26 #define SHARE_VM_RUNTIME_BASICLOCK_HPP 27 28 #include "oops/markOop.hpp" 29 #include "runtime/handles.hpp" 30 31 class BasicLock VALUE_OBJ_CLASS_SPEC { 32 friend class VMStructs; 33 friend class JVMCIVMStructs; 34 private: 35 volatile markOop _displaced_header; 36 public: 37 markOop displaced_header() const { return _displaced_header; } 38 void set_displaced_header(markOop header) { _displaced_header = header; } 39 40 void print_on(outputStream* st) const; 41 42 // move a basic lock (used during deoptimization 43 void move_to(oop obj, BasicLock* dest); 44 45 static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } 46 }; 47 48 // A BasicObjectLock associates a specific Java object with a BasicLock. 49 // It is currently embedded in an interpreter frame. 50 51 // Because some machines have alignment restrictions on the control stack, 52 // the actual space allocated by the interpreter may include padding words 53 // after the end of the BasicObjectLock. Also, in order to guarantee 54 // alignment of the embedded BasicLock objects on such machines, we 55 // put the embedded BasicLock at the beginning of the struct. 56 57 class BasicObjectLock VALUE_OBJ_CLASS_SPEC { 58 friend class VMStructs; 59 private: 60 BasicLock _lock; // the lock, must be double word aligned 61 oop _obj; // object holds the lock; 62 63 public: 64 // Manipulation 65 oop obj() const { return _obj; } 66 void set_obj(oop obj) { _obj = obj; } 67 BasicLock* lock() { return &_lock; } 68 69 // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks 70 // in interpreter activation frames since it includes machine-specific padding. 71 static int size() { return sizeof(BasicObjectLock)/wordSize; } 72 73 // GC support 74 void oops_do(OopClosure* f) { f->do_oop(&_obj); } 75 76 static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } 77 static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } | 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 #ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP 26 #define SHARE_VM_RUNTIME_BASICLOCK_HPP 27 28 #include "oops/markOop.hpp" 29 #include "runtime/handles.hpp" 30 31 class BasicLock { 32 friend class VMStructs; 33 friend class JVMCIVMStructs; 34 private: 35 volatile markOop _displaced_header; 36 public: 37 markOop displaced_header() const { return _displaced_header; } 38 void set_displaced_header(markOop header) { _displaced_header = header; } 39 40 void print_on(outputStream* st) const; 41 42 // move a basic lock (used during deoptimization 43 void move_to(oop obj, BasicLock* dest); 44 45 static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } 46 }; 47 48 // A BasicObjectLock associates a specific Java object with a BasicLock. 49 // It is currently embedded in an interpreter frame. 50 51 // Because some machines have alignment restrictions on the control stack, 52 // the actual space allocated by the interpreter may include padding words 53 // after the end of the BasicObjectLock. Also, in order to guarantee 54 // alignment of the embedded BasicLock objects on such machines, we 55 // put the embedded BasicLock at the beginning of the struct. 56 57 class BasicObjectLock { 58 friend class VMStructs; 59 private: 60 BasicLock _lock; // the lock, must be double word aligned 61 oop _obj; // object holds the lock; 62 63 public: 64 // Manipulation 65 oop obj() const { return _obj; } 66 void set_obj(oop obj) { _obj = obj; } 67 BasicLock* lock() { return &_lock; } 68 69 // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks 70 // in interpreter activation frames since it includes machine-specific padding. 71 static int size() { return sizeof(BasicObjectLock)/wordSize; } 72 73 // GC support 74 void oops_do(OopClosure* f) { f->do_oop(&_obj); } 75 76 static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } 77 static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } |