hotspot/src/share/vm/opto/castnode.hpp
author thartmann
Tue, 12 Jan 2016 12:55:09 +0100
changeset 35551 36ef3841fb34
parent 35549 3415401a6b6e
child 35574 2b25eb88c8d6
permissions -rw-r--r--
8146629: Make phase->is_IterGVN() accessible from Node::Identity and Node::Value Summary: Change arguments of Node::Identity() and Node::Value() from PhaseTransform* to PhaseGVN*. Reviewed-by: kvn, roland
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/*
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 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_OPTO_CASTNODE_HPP
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#define SHARE_VM_OPTO_CASTNODE_HPP
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#include "opto/node.hpp"
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#include "opto/opcodes.hpp"
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//------------------------------ConstraintCastNode-----------------------------
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// cast to a different range
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class ConstraintCastNode: public TypeNode {
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  protected:
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  // Can this node be removed post CCP or does it carry a required dependency?
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  const bool _carry_dependency;
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  virtual uint cmp( const Node &n ) const;
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  virtual uint size_of() const;
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  public:
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  ConstraintCastNode(Node *n, const Type *t, bool carry_dependency)
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    : TypeNode(t,2), _carry_dependency(carry_dependency) {
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    init_class_id(Class_ConstraintCast);
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    init_req(1, n);
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  }
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  virtual Node* Identity(PhaseGVN* phase);
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  virtual const Type* Value(PhaseGVN* phase) const;
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  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
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  virtual int Opcode() const;
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  virtual uint ideal_reg() const = 0;
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  virtual bool depends_only_on_test() const { return !_carry_dependency; }
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  bool carry_dependency() const { return _carry_dependency; }
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  TypeNode* dominating_cast(PhaseTransform *phase) const;
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  static Node* make_cast(int opcode,  Node* c, Node *n, const Type *t, bool carry_dependency);
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#ifndef PRODUCT
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  virtual void dump_spec(outputStream *st) const;
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#endif
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};
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//------------------------------CastIINode-------------------------------------
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// cast integer to integer (different range)
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class CastIINode: public ConstraintCastNode {
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  public:
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  CastIINode(Node *n, const Type *t, bool carry_dependency = false)
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    : ConstraintCastNode(n, t, carry_dependency) {}
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  virtual int Opcode() const;
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  virtual uint ideal_reg() const { return Op_RegI; }
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  virtual const Type* Value(PhaseGVN* phase) const;
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  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
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};
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//------------------------------CastPPNode-------------------------------------
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// cast pointer to pointer (different type)
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class CastPPNode: public ConstraintCastNode {
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  public:
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  CastPPNode (Node *n, const Type *t, bool carry_dependency = false)
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    : ConstraintCastNode(n, t, carry_dependency) {
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  }
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  virtual int Opcode() const;
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  virtual uint ideal_reg() const { return Op_RegP; }
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};
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//------------------------------CheckCastPPNode--------------------------------
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// for _checkcast, cast pointer to pointer (different type), without JOIN,
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class CheckCastPPNode: public ConstraintCastNode {
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  public:
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  CheckCastPPNode(Node *c, Node *n, const Type *t, bool carry_dependency = false)
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    : ConstraintCastNode(n, t, carry_dependency) {
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    init_class_id(Class_CheckCastPP);
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    init_req(0, c);
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  }
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  virtual Node* Identity(PhaseGVN* phase);
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  virtual const Type* Value(PhaseGVN* phase) const;
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  virtual int   Opcode() const;
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  virtual uint  ideal_reg() const { return Op_RegP; }
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};
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//------------------------------CastX2PNode-------------------------------------
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// convert a machine-pointer-sized integer to a raw pointer
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class CastX2PNode : public Node {
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  public:
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  CastX2PNode( Node *n ) : Node(NULL, n) {}
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  virtual int Opcode() const;
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  virtual const Type* Value(PhaseGVN* phase) const;
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  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
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  virtual Node* Identity(PhaseGVN* phase);
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  virtual uint ideal_reg() const { return Op_RegP; }
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  virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
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};
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//------------------------------CastP2XNode-------------------------------------
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// Used in both 32-bit and 64-bit land.
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// Used for card-marks and unsafe pointer math.
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class CastP2XNode : public Node {
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  public:
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  CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}
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  virtual int Opcode() const;
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  virtual const Type* Value(PhaseGVN* phase) const;
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  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
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  virtual Node* Identity(PhaseGVN* phase);
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  virtual uint ideal_reg() const { return Op_RegX; }
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  virtual const Type *bottom_type() const { return TypeX_X; }
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  // Return false to keep node from moving away from an associated card mark.
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  virtual bool depends_only_on_test() const { return false; }
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};
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#endif // SHARE_VM_OPTO_CASTNODE_HPP