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