Method delDef

chapter23/src/main/java/com/seaofnodes/simple/node/Node.java:196–204

(int idx)

    // Phi, but not for every Node.  If the def goes dead, it is recursively
    // killed, which may include 'this' Node.
    public Node delDef(int idx) {
        unlock();
        Node old_def = in(idx);
        _inputs.del(idx);
        if( old_def.delUse(this) ) // If we removed the last use, the old def is now dead
            old_def.kill();     // Kill old def
        old_def.moveDepsToWorklist();
        return this;
    }

    // Insert the numbered input, sliding other inputs to the right
    Node insertDef(int idx, Node new_def) {