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comparison: src/share/vm/opto/rootnode.hpp
src/share/vm/opto/rootnode.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 2010, 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 #ifndef SHARE_VM_OPTO_ROOTNODE_HPP | |
| 26 #define SHARE_VM_OPTO_ROOTNODE_HPP | |
| 27 | |
| 28 #include "opto/loopnode.hpp" | |
| 29 | |
| 30 //------------------------------RootNode--------------------------------------- | |
| 31 // The one-and-only before-all-else and after-all-else RootNode. The RootNode | |
| 32 // represents what happens if the user runs the whole program repeatedly. The | |
| 33 // RootNode produces the initial values of I/O and memory for the program or | |
| 34 // procedure start. | |
| 35 class RootNode : public LoopNode { | |
| 36 public: | |
| 37 RootNode( ) : LoopNode(0,0) { | |
| 38 init_class_id(Class_Root); | |
| 39 del_req(2); | |
| 40 del_req(1); | |
| 41 } | |
| 42 virtual int Opcode() const; | |
| 43 virtual const Node *is_block_proj() const { return this; } | |
| 44 virtual const Type *bottom_type() const { return Type::BOTTOM; } | |
| 45 virtual Node *Identity( PhaseTransform *phase ) { return this; } | |
| 46 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 47 virtual const Type *Value( PhaseTransform *phase ) const { return Type::BOTTOM; } | |
| 48 }; | |
| 49 | |
| 50 //------------------------------HaltNode--------------------------------------- | |
| 51 // Throw an exception & die | |
| 52 class HaltNode : public Node { | |
| 53 public: | |
| 54 HaltNode( Node *ctrl, Node *frameptr ); | |
| 55 virtual int Opcode() const; | |
| 56 virtual bool pinned() const { return true; }; | |
| 57 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 58 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 59 virtual const Type *bottom_type() const; | |
| 60 virtual bool is_CFG() const { return true; } | |
| 61 virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash | |
| 62 virtual bool depends_only_on_test() const { return false; } | |
| 63 virtual const Node *is_block_proj() const { return this; } | |
| 64 virtual const RegMask &out_RegMask() const; | |
| 65 virtual uint ideal_reg() const { return NotAMachineReg; } | |
| 66 virtual uint match_edge(uint idx) const { return 0; } | |
| 67 }; | |
| 68 | |
| 69 #endif // SHARE_VM_OPTO_ROOTNODE_HPP |
