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 java.util.*;
026import java.util.function.*;
027
028import jdk.internal.jvmci.meta.*;
029
030import com.oracle.graal.compiler.common.cfg.*;
031import com.oracle.graal.lir.*;
032import com.oracle.graal.lir.StandardOp.MoveOp;
033
034/**
035 * Represents def-use tree of a constant.
036 */
037class DefUseTree {
038    private final LIRInstruction instruction;
039    private final AbstractBlockBase<?> block;
040    private final List<UseEntry> uses;
041
042    public DefUseTree(LIRInstruction instruction, AbstractBlockBase<?> block) {
043        assert instruction instanceof MoveOp : "Not a MoveOp: " + instruction;
044        this.instruction = instruction;
045        this.block = block;
046        this.uses = new ArrayList<>();
047    }
048
049    public Variable getVariable() {
050        return (Variable) ((MoveOp) instruction).getResult();
051    }
052
053    public JavaConstant getConstant() {
054        return (JavaConstant) ((MoveOp) instruction).getInput();
055    }
056
057    public LIRInstruction getInstruction() {
058        return instruction;
059    }
060
061    public AbstractBlockBase<?> getBlock() {
062        return block;
063    }
064
065    @Override
066    public String toString() {
067        return "DefUseTree [" + instruction + "|" + block + "," + uses + "]";
068    }
069
070    public void addUsage(AbstractBlockBase<?> b, LIRInstruction inst, Value value) {
071        uses.add(new UseEntry(b, inst, value));
072    }
073
074    public int usageCount() {
075        return uses.size();
076    }
077
078    public void forEach(Consumer<? super UseEntry> action) {
079        uses.forEach(action);
080    }
081
082}