1 /*
   2  * Copyright (c) 1997, 2005, 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 //------------------------------RootNode---------------------------------------
  26 // The one-and-only before-all-else and after-all-else RootNode.  The RootNode
  27 // represents what happens if the user runs the whole program repeatedly.  The
  28 // RootNode produces the initial values of I/O and memory for the program or
  29 // procedure start.
  30 class RootNode : public LoopNode {
  31 public:
  32   RootNode( ) : LoopNode(0,0) {
  33     init_class_id(Class_Root);
  34     del_req(2);
  35     del_req(1);
  36   }
  37   virtual int   Opcode() const;
  38   virtual const Node *is_block_proj() const { return this; }
  39   virtual const Type *bottom_type() const { return Type::BOTTOM; }
  40   virtual Node *Identity( PhaseTransform *phase ) { return this; }
  41   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  42   virtual const Type *Value( PhaseTransform *phase ) const { return Type::BOTTOM; }
  43 };
  44 
  45 //------------------------------HaltNode---------------------------------------
  46 // Throw an exception & die
  47 class HaltNode : public Node {
  48 public:
  49   HaltNode( Node *ctrl, Node *frameptr );
  50   virtual int Opcode() const;
  51   virtual bool  pinned() const { return true; };
  52   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  53   virtual const Type *Value( PhaseTransform *phase ) const;
  54   virtual const Type *bottom_type() const;
  55   virtual bool  is_CFG() const { return true; }
  56   virtual uint hash() const { return NO_HASH; }  // CFG nodes do not hash
  57   virtual bool depends_only_on_test() const { return false; }
  58   virtual const Node *is_block_proj() const { return this; }
  59   virtual const RegMask &out_RegMask() const;
  60   virtual uint ideal_reg() const { return NotAMachineReg; }
  61   virtual uint match_edge(uint idx) const { return 0; }
  62 };