vaporize/library/LIRVar.java


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package vaporize.library;

import misc.*;

public class LIRVar implements Comparable<LIRVar> {

    private String alias;
    private TransientInterval interval;

    private String register;

    public LIRVar(String alias, int fd, int lu) {
        this.alias = alias;
        this.interval = new TransientInterval(fd, lu);
        this.register = null;
    }

    @Override public String toString() {
        return String.format("%s: %d -> %d",
                             this.alias,
                             this.interval.first_def,
                             this.interval.last_use);
    }

    @Override public boolean equals(Object other) {
        LIRVar o;
        return (other instanceof LIRVar &&
                ((o = (LIRVar) other)).alias.equals(this.alias) &&
                o.interval.equals(this.interval)) ||
            (other instanceof String &&
             this.alias.equals((String) other));
    }

    @Override public int hashCode() {
        return alias.hashCode();
    }

    @Override public int compareTo(LIRVar other) {
        int ret;
        if (this.interval.first_def > other.interval.first_def)
            ret = 1;
        else if (this.interval.first_def < other.interval.first_def)
            ret = -1;
        else
            ret = 0;
        return ret;
    }

    protected boolean trySetLastUse(int last_use) {
        /**
         * If the passed last_use is greater than
         * the this.last_use, override this.last_use.
         */
        boolean ret = last_use > this.interval.last_use;

        if (ret)
            this.interval.last_use = last_use;
        return ret;
    }

    public void assignRegister(String register) {
        this.register = register;
    }
}