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annotate src/share/vm/opto/rootnode.hpp @ 1721:413ad0331a0c

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6977924: Changes for 6975078 produce build error with certain gcc versions Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error. Reviewed-by: jcoomes, ysr, phh
author johnc
date Wed, 18 Aug 2010 10:59:06 -0700
parents c18cbe5936b8
children f95d63e2154a
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1 /*
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2 * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 //------------------------------RootNode---------------------------------------
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26 // The one-and-only before-all-else and after-all-else RootNode. The RootNode
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27 // represents what happens if the user runs the whole program repeatedly. The
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28 // RootNode produces the initial values of I/O and memory for the program or
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29 // procedure start.
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30 class RootNode : public LoopNode {
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31 public:
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32 RootNode( ) : LoopNode(0,0) {
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33 init_class_id(Class_Root);
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34 del_req(2);
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35 del_req(1);
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36 }
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37 virtual int Opcode() const;
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38 virtual const Node *is_block_proj() const { return this; }
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39 virtual const Type *bottom_type() const { return Type::BOTTOM; }
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40 virtual Node *Identity( PhaseTransform *phase ) { return this; }
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41 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
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42 virtual const Type *Value( PhaseTransform *phase ) const { return Type::BOTTOM; }
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43 };
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44
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45 //------------------------------HaltNode---------------------------------------
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46 // Throw an exception & die
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47 class HaltNode : public Node {
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48 public:
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49 HaltNode( Node *ctrl, Node *frameptr );
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50 virtual int Opcode() const;
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51 virtual bool pinned() const { return true; };
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52 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
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53 virtual const Type *Value( PhaseTransform *phase ) const;
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54 virtual const Type *bottom_type() const;
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55 virtual bool is_CFG() const { return true; }
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56 virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash
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57 virtual bool depends_only_on_test() const { return false; }
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58 virtual const Node *is_block_proj() const { return this; }
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59 virtual const RegMask &out_RegMask() const;
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60 virtual uint ideal_reg() const { return NotAMachineReg; }
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61 virtual uint match_edge(uint idx) const { return 0; }
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62 };