locknode.hpp

/*
 * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

//------------------------------BoxLockNode------------------------------------
class BoxLockNode : public Node {
public:
  const int _slot;
  RegMask   _inmask;
  bool _is_eliminated;    // indicates this lock was safely eliminated

  BoxLockNode( int lock );
  virtual int Opcode() const;
  virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
  virtual uint size(PhaseRegAlloc *ra_) const;
  virtual const RegMask &in_RegMask(uint) const;
  virtual const RegMask &out_RegMask() const;
  virtual uint size_of() const;
  virtual uint hash() const { return Node::hash() + _slot; }
  virtual uint cmp( const Node &n ) const;
  virtual const class Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
  virtual uint ideal_reg() const { return Op_RegP; }

  static OptoReg::Name stack_slot(Node* box_node);

  bool is_eliminated()  { return _is_eliminated; }
  // mark lock as eliminated.
  void set_eliminated() { _is_eliminated = true; }

#ifndef PRODUCT
  virtual void format( PhaseRegAlloc *, outputStream *st ) const;
  virtual void dump_spec(outputStream *st) const { st->print("  Lock %d",_slot); }
#endif
};

//------------------------------FastLockNode-----------------------------------
class FastLockNode: public CmpNode {
private:
  BiasedLockingCounters* _counters;

public:
  FastLockNode(Node *ctrl, Node *oop, Node *box) : CmpNode(oop,box) {
    init_req(0,ctrl);
    init_class_id(Class_FastLock);
    _counters = NULL;
  }
  Node* obj_node() const { return in(1); }
  Node* box_node() const { return in(2); }

  // FastLock and FastUnlockNode do not hash, we need one for each correspoding
  // LockNode/UnLockNode to avoid creating Phi's.
  virtual uint hash() const ;                  // { return NO_HASH; }
  virtual uint cmp( const Node &n ) const ;    // Always fail, except on self
  virtual int Opcode() const;
  virtual const Type *Value( PhaseTransform *phase ) const { return TypeInt::CC; }
  const Type *sub(const Type *t1, const Type *t2) const { return TypeInt::CC;}

  void create_lock_counter(JVMState* s);
  BiasedLockingCounters* counters() const { return _counters; }
};


//------------------------------FastUnlockNode---------------------------------
class FastUnlockNode: public CmpNode {
public:
  FastUnlockNode(Node *ctrl, Node *oop, Node *box) : CmpNode(oop,box) {
    init_req(0,ctrl);
    init_class_id(Class_FastUnlock);
  }
  Node* obj_node() const { return in(1); }
  Node* box_node() const { return in(2); }


  // FastLock and FastUnlockNode do not hash, we need one for each correspoding
  // LockNode/UnLockNode to avoid creating Phi's.
  virtual uint hash() const ;                  // { return NO_HASH; }
  virtual uint cmp( const Node &n ) const ;    // Always fail, except on self
  virtual int Opcode() const;
  virtual const Type *Value( PhaseTransform *phase ) const { return TypeInt::CC; }
  const Type *sub(const Type *t1, const Type *t2) const { return TypeInt::CC;}

};