1 /*

     2  * Copyright (c) 2014, 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 #ifndef SHARE_VM_OPTO_CASTNODE_HPP

    26 #define SHARE_VM_OPTO_CASTNODE_HPP

    27 

    28 #include "opto/node.hpp"

    29 #include "opto/opcodes.hpp"

    30 

    31 

    32 //------------------------------ConstraintCastNode-----------------------------

    33 // cast to a different range

    34 class ConstraintCastNode: public TypeNode {

    35   public:

    36   ConstraintCastNode (Node *n, const Type *t ): TypeNode(t,2) {

    37     init_class_id(Class_ConstraintCast);

    38     init_req(1, n);

    39   }

    40   virtual Node *Identity( PhaseTransform *phase );

    41   virtual const Type *Value( PhaseTransform *phase ) const;

    42   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

    43   virtual int Opcode() const;

    44   virtual uint ideal_reg() const = 0;

    45   virtual Node *Ideal_DU_postCCP( PhaseCCP * );

    46 };

    47 

    48 //------------------------------CastIINode-------------------------------------

    49 // cast integer to integer (different range)

    50 class CastIINode: public ConstraintCastNode {

    51   public:

    52   CastIINode (Node *n, const Type *t ): ConstraintCastNode(n,t) {}

    53   virtual int Opcode() const;

    54   virtual uint ideal_reg() const { return Op_RegI; }

    55 };

    56 

    57 //------------------------------CastPPNode-------------------------------------

    58 // cast pointer to pointer (different type)

    59 class CastPPNode: public ConstraintCastNode {

    60   public:

    61   CastPPNode (Node *n, const Type *t ): ConstraintCastNode(n, t) {}

    62   virtual int Opcode() const;

    63   virtual uint ideal_reg() const { return Op_RegP; }

    64   virtual Node *Ideal_DU_postCCP( PhaseCCP * );

    65 };

    66 

    67 //------------------------------CheckCastPPNode--------------------------------

    68 // for _checkcast, cast pointer to pointer (different type), without JOIN,

    69 class CheckCastPPNode: public TypeNode {

    70   public:

    71   CheckCastPPNode( Node *c, Node *n, const Type *t ) : TypeNode(t,2) {

    72     init_class_id(Class_CheckCastPP);

    73     init_req(0, c);

    74     init_req(1, n);

    75   }

    76 

    77   virtual Node *Identity( PhaseTransform *phase );

    78   virtual const Type *Value( PhaseTransform *phase ) const;

    79   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

    80   virtual int   Opcode() const;

    81   virtual uint  ideal_reg() const { return Op_RegP; }

    82   // No longer remove CheckCast after CCP as it gives me a place to hang

    83   // the proper address type - which is required to compute anti-deps.

    84   //virtual Node *Ideal_DU_postCCP( PhaseCCP * );

    85 };

    86 

    87 

    88 //------------------------------CastX2PNode-------------------------------------

    89 // convert a machine-pointer-sized integer to a raw pointer

    90 class CastX2PNode : public Node {

    91   public:

    92   CastX2PNode( Node *n ) : Node(NULL, n) {}

    93   virtual int Opcode() const;

    94   virtual const Type *Value( PhaseTransform *phase ) const;

    95   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

    96   virtual Node *Identity( PhaseTransform *phase );

    97   virtual uint ideal_reg() const { return Op_RegP; }

    98   virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }

    99 };

   100 

   101 //------------------------------CastP2XNode-------------------------------------

   102 // Used in both 32-bit and 64-bit land.

   103 // Used for card-marks and unsafe pointer math.

   104 class CastP2XNode : public Node {

   105   public:

   106   CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}

   107   virtual int Opcode() const;

   108   virtual const Type *Value( PhaseTransform *phase ) const;

   109   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

   110   virtual Node *Identity( PhaseTransform *phase );

   111   virtual uint ideal_reg() const { return Op_RegX; }

   112   virtual const Type *bottom_type() const { return TypeX_X; }

   113   // Return false to keep node from moving away from an associated card mark.

   114   virtual bool depends_only_on_test() const { return false; }

   115 };

   116 

   117 

   118 

   119 #endif // SHARE_VM_OPTO_CASTNODE_HPP