DIFFICULTY + BLOCKHASH tracer

tracer.js

{
    hist: {
        DIFFICULTY: {},
        BLOCKHASH: {},
        CALLCODE: {},
    },
    found: false,
    fault: function(log) {},
    step: function(log) {
        var op = log.op.toString();
        var addr = toHex(log.contract.getAddress());
        if(op == "DIFFICULTY" || op == "BLOCKHASH" || op == "CALLCODE") {
            if(this.hist[op][addr]) {
                this.hist[op][addr]++;
            } else {
                this.hist[op][addr] = 1;
            } this.found = true;
        }
    },
    result: function() {
        if (this.found) {
            return this.hist;
        } else {
            return ""
        }
    }
}