duke@435: /*
stefank@2314:  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_OPTO_ROOTNODE_HPP
stefank@2314: #define SHARE_VM_OPTO_ROOTNODE_HPP
stefank@2314: 
stefank@2314: #include "opto/loopnode.hpp"
stefank@2314: 
duke@435: //------------------------------RootNode---------------------------------------
duke@435: // The one-and-only before-all-else and after-all-else RootNode.  The RootNode
duke@435: // represents what happens if the user runs the whole program repeatedly.  The
duke@435: // RootNode produces the initial values of I/O and memory for the program or
duke@435: // procedure start.
duke@435: class RootNode : public LoopNode {
duke@435: public:
duke@435:   RootNode( ) : LoopNode(0,0) {
duke@435:     init_class_id(Class_Root);
duke@435:     del_req(2);
duke@435:     del_req(1);
duke@435:   }
duke@435:   virtual int   Opcode() const;
duke@435:   virtual const Node *is_block_proj() const { return this; }
duke@435:   virtual const Type *bottom_type() const { return Type::BOTTOM; }
duke@435:   virtual Node *Identity( PhaseTransform *phase ) { return this; }
duke@435:   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
duke@435:   virtual const Type *Value( PhaseTransform *phase ) const { return Type::BOTTOM; }
duke@435: };
duke@435: 
duke@435: //------------------------------HaltNode---------------------------------------
duke@435: // Throw an exception & die
duke@435: class HaltNode : public Node {
duke@435: public:
duke@435:   HaltNode( Node *ctrl, Node *frameptr );
duke@435:   virtual int Opcode() const;
duke@435:   virtual bool  pinned() const { return true; };
duke@435:   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
duke@435:   virtual const Type *Value( PhaseTransform *phase ) const;
duke@435:   virtual const Type *bottom_type() const;
duke@435:   virtual bool  is_CFG() const { return true; }
duke@435:   virtual uint hash() const { return NO_HASH; }  // CFG nodes do not hash
duke@435:   virtual bool depends_only_on_test() const { return false; }
duke@435:   virtual const Node *is_block_proj() const { return this; }
duke@435:   virtual const RegMask &out_RegMask() const;
duke@435:   virtual uint ideal_reg() const { return NotAMachineReg; }
duke@435:   virtual uint match_edge(uint idx) const { return 0; }
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_OPTO_ROOTNODE_HPP