001/*
002 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.lir.constopt;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.compiler.common.cfg.*;
028import com.oracle.graal.lir.*;
029
030/**
031 * Represents a usage of a constant.
032 */
033class UseEntry {
034
035    private final AbstractBlockBase<?> block;
036    private final LIRInstruction instruction;
037    private final Value value;
038
039    public UseEntry(AbstractBlockBase<?> block, LIRInstruction instruction, Value value) {
040        this.block = block;
041        this.instruction = instruction;
042        this.value = value;
043    }
044
045    public LIRInstruction getInstruction() {
046        return instruction;
047    }
048
049    public AbstractBlockBase<?> getBlock() {
050        return block;
051    }
052
053    public void setValue(Value newValue) {
054        replaceValue(instruction, value, newValue);
055    }
056
057    private static void replaceValue(LIRInstruction op, Value oldValue, Value newValue) {
058        ValueProcedure proc = (value, mode, flags) -> value.identityEquals(oldValue) ? newValue : value;
059        op.forEachAlive(proc);
060        op.forEachInput(proc);
061        op.forEachOutput(proc);
062        op.forEachTemp(proc);
063        op.forEachState(proc);
064    }
065
066    public Value getValue() {
067        return value;
068    }
069
070    @Override
071    public String toString() {
072        return "Use[" + getValue() + ":" + instruction + ":" + block + "]";
073    }
074
075}