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src/hotspot/share/runtime/basicLock.hpp

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  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); }
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