/*

 * 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.

 *

 *

 */

// Portions of code courtesy of Clifford Click

class PhaseTransform;

//------------------------------AddNode----------------------------------------

// Classic Add functionality.  This covers all the usual 'add' behaviors for

// an algebraic ring.  Add-integer, add-float, add-double, and binary-or are

// all inherited from this class.  The various identity values are supplied

// by virtual functions.

class AddNode : public Node {

  virtual uint hash() const;

public:

  AddNode( Node *in1, Node *in2 ) : Node(0,in1,in2) {

    init_class_id(Class_Add);

  }

  // Handle algebraic identities here.  If we have an identity, return the Node

  // we are equivalent to.  We look for "add of zero" as an identity.

  virtual Node *Identity( PhaseTransform *phase );

  // We also canonicalize the Node, moving constants to the right input,

  // and flatten expressions (so that 1+x+2 becomes x+3).

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

  // Compute a new Type for this node.  Basically we just do the pre-check,

  // then call the virtual add() to set the type.

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

  // Check if this addition involves the additive identity

  virtual const Type *add_of_identity( const Type *t1, const Type *t2 ) const;

  // Supplied function returns the sum of the inputs.

  // This also type-checks the inputs for sanity.  Guaranteed never to

  // be passed a TOP or BOTTOM type, these are filtered out by a pre-check.

  virtual const Type *add_ring( const Type *, const Type * ) const = 0;

  // Supplied function to return the additive identity type

  virtual const Type *add_id() const = 0;

};

//------------------------------AddINode---------------------------------------

// Add 2 integers

class AddINode : public AddNode {

public:

  AddINode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeInt::ZERO; }

  virtual const Type *bottom_type() const { return TypeInt::INT; }

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

  virtual Node *Identity( PhaseTransform *phase );

  virtual uint ideal_reg() const { return Op_RegI; }

};

//------------------------------AddLNode---------------------------------------

// Add 2 longs

class AddLNode : public AddNode {

public:

  AddLNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeLong::ZERO; }

  virtual const Type *bottom_type() const { return TypeLong::LONG; }

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

  virtual Node *Identity( PhaseTransform *phase );

  virtual uint ideal_reg() const { return Op_RegL; }

};

//------------------------------AddFNode---------------------------------------

// Add 2 floats

class AddFNode : public AddNode {

public:

  AddFNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

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

  virtual const Type *add_of_identity( const Type *t1, const Type *t2 ) const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeF::ZERO; }

  virtual const Type *bottom_type() const { return Type::FLOAT; }

  virtual Node *Identity( PhaseTransform *phase ) { return this; }

  virtual uint ideal_reg() const { return Op_RegF; }

};

//------------------------------AddDNode---------------------------------------

// Add 2 doubles

class AddDNode : public AddNode {

public:

  AddDNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

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

  virtual const Type *add_of_identity( const Type *t1, const Type *t2 ) const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeD::ZERO; }

  virtual const Type *bottom_type() const { return Type::DOUBLE; }

  virtual Node *Identity( PhaseTransform *phase ) { return this; }

  virtual uint ideal_reg() const { return Op_RegD; }

};

//------------------------------AddPNode---------------------------------------

// Add pointer plus integer to get pointer.  NOT commutative, really.

// So not really an AddNode.  Lives here, because people associate it with

// an add.

class AddPNode : public Node {

public:

  enum { Control,               // When is it safe to do this add?

         Base,                  // Base oop, for GC purposes

         Address,               // Actually address, derived from base

         Offset } ;             // Offset added to address

  AddPNode( Node *base, Node *ptr, Node *off ) : Node(0,base,ptr,off) {

    init_class_id(Class_AddP);

  }

  virtual int Opcode() const;

  virtual Node *Identity( PhaseTransform *phase );

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

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

  virtual const Type *bottom_type() const;

  virtual uint  ideal_reg() const { return Op_RegP; }

  Node         *base_node() { assert( req() > Base, "Missing base"); return in(Base); }

  static Node* Ideal_base_and_offset(Node* ptr, PhaseTransform* phase,

                                     // second return value:

                                     intptr_t& offset);

  // Collect the AddP offset values into the elements array, giving up

  // if there are more than length.

  int unpack_offsets(Node* elements[], int length);

  // Do not match base-ptr edge

  virtual uint match_edge(uint idx) const;

};

//------------------------------OrINode----------------------------------------

// Logically OR 2 integers.  Included with the ADD nodes because it inherits

// all the behavior of addition on a ring.

class OrINode : public AddNode {

public:

  OrINode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeInt::ZERO; }

  virtual const Type *bottom_type() const { return TypeInt::INT; }

  virtual Node *Identity( PhaseTransform *phase );

  virtual uint ideal_reg() const { return Op_RegI; }

};

//------------------------------OrLNode----------------------------------------

// Logically OR 2 longs.  Included with the ADD nodes because it inherits

// all the behavior of addition on a ring.

class OrLNode : public AddNode {

public:

  OrLNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeLong::ZERO; }

  virtual const Type *bottom_type() const { return TypeLong::LONG; }

  virtual Node *Identity( PhaseTransform *phase );

  virtual uint ideal_reg() const { return Op_RegL; }

};

//------------------------------XorINode---------------------------------------

// XOR'ing 2 integers

class XorINode : public AddNode {

public:

  XorINode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeInt::ZERO; }

  virtual const Type *bottom_type() const { return TypeInt::INT; }

  virtual uint ideal_reg() const { return Op_RegI; }

};

//------------------------------XorINode---------------------------------------

// XOR'ing 2 longs

class XorLNode : public AddNode {

public:

  XorLNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeLong::ZERO; }

  virtual const Type *bottom_type() const { return TypeLong::LONG; }

  virtual uint ideal_reg() const { return Op_RegL; }

};

//------------------------------MaxNode----------------------------------------

// Max (or min) of 2 values.  Included with the ADD nodes because it inherits

// all the behavior of addition on a ring.  Only new thing is that we allow

// 2 equal inputs to be equal.

class MaxNode : public AddNode {

public:

  MaxNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}

  virtual int Opcode() const = 0;

};

//------------------------------MaxINode---------------------------------------

// Maximum of 2 integers.  Included with the ADD nodes because it inherits

// all the behavior of addition on a ring.

class MaxINode : public MaxNode {

public:

  MaxINode( Node *in1, Node *in2 ) : MaxNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeInt::make(min_jint); }

  virtual const Type *bottom_type() const { return TypeInt::INT; }

  virtual uint ideal_reg() const { return Op_RegI; }

};

//------------------------------MinINode---------------------------------------

// MINimum of 2 integers.  Included with the ADD nodes because it inherits

// all the behavior of addition on a ring.

class MinINode : public MaxNode {

public:

  MinINode( Node *in1, Node *in2 ) : MaxNode(in1,in2) {}

  virtual int Opcode() const;

  virtual const Type *add_ring( const Type *, const Type * ) const;

  virtual const Type *add_id() const { return TypeInt::make(max_jint); }

  virtual const Type *bottom_type() const { return TypeInt::INT; }

  virtual uint ideal_reg() const { return Op_RegI; }

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

};