multnode.hpp revision 196:d1605aabd0a1 
1/*
2 * Copyright 1997-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25class Matcher;
26class ProjNode;
27
28//------------------------------MultiNode--------------------------------------
29// This class defines a MultiNode, a Node which produces many values.  The
30// values are wrapped up in a tuple Type, i.e. a TypeTuple.
31class MultiNode : public Node {
32public:
33  MultiNode( uint required ) : Node(required) {
34    init_class_id(Class_Multi);
35  }
36  virtual int Opcode() const;
37  virtual const Type *bottom_type() const = 0;
38  virtual bool       is_CFG() const { return true; }
39  virtual uint hash() const { return NO_HASH; }  // CFG nodes do not hash
40  virtual bool depends_only_on_test() const { return false; }
41  virtual const RegMask &out_RegMask() const;
42  virtual Node *match( const ProjNode *proj, const Matcher *m );
43  virtual uint ideal_reg() const { return NotAMachineReg; }
44  ProjNode* proj_out(uint which_proj) const; // Get a named projection
45
46};
47
48//------------------------------ProjNode---------------------------------------
49// This class defines a Projection node.  Projections project a single element
50// out of a tuple (or Signature) type.  Only MultiNodes produce TypeTuple
51// results.
52class ProjNode : public Node {
53protected:
54  virtual uint hash() const;
55  virtual uint cmp( const Node &n ) const;
56  virtual uint size_of() const;
57  void check_con() const;       // Called from constructor.
58
59public:
60  ProjNode( Node *src, uint con, bool io_use = false )
61    : Node( src ), _con(con), _is_io_use(io_use)
62  {
63    init_class_id(Class_Proj);
64    // Optimistic setting. Need additional checks in Node::is_dead_loop_safe().
65    if (con != TypeFunc::Memory || src->is_Start())
66      init_flags(Flag_is_dead_loop_safe);
67    debug_only(check_con());
68  }
69  const uint _con;              // The field in the tuple we are projecting
70  const bool _is_io_use;        // Used to distinguish between the projections
71                                // used on the control and io paths from a macro node
72  virtual int Opcode() const;
73  virtual bool      is_CFG() const;
74  virtual bool depends_only_on_test() const { return false; }
75  virtual const Type *bottom_type() const;
76  virtual const TypePtr *adr_type() const;
77  virtual bool pinned() const;
78  virtual const Type *Value( PhaseTransform *phase ) const;
79  virtual uint ideal_reg() const;
80  virtual const RegMask &out_RegMask() const;
81#ifndef PRODUCT
82  virtual void dump_spec(outputStream *st) const;
83#endif
84};
85