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 };