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The GraalVM compiler and the Graal-truffle optimizer.

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/*
 * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package jdk.graal.compiler.hightiercodegen.variables;

import java.util.HashMap;

import jdk.graal.compiler.nodes.ValueNode;

/**
 * Storing variable allocation result for a method.
 */
public final class VariableMap {
    public static final String LOCAL_PREFIX = "l";

    /** Counter for generating unique ids in the scope of a method. */
    private int count = 0;

    /**
     * The nodes stored with the resolved variables.
     */
    private final HashMap resolvedVars;

    public VariableMap() {
        resolvedVars = new HashMap<>();
    }

    public ResolvedVar getVarByNode(ValueNode n) {
        assert n != null;
        return resolvedVars.get(n);
    }

    /**
     * Allocate a variable for the given node.
     */
    public ResolvedVar allocate(ValueNode n) {
        assert !resolvedVars.containsKey(n) : "already allocated for " + n;
        ResolvedVar var = new ResolvedVar(n);
        var.birth(LOCAL_PREFIX + count);
        resolvedVars.put(n, var);
        count++;
        return var;
    }

    @Override
    public String toString() {
        return "Variable count: " + resolvedVars.size() + "\n" + resolvedVars;
    }
}