// Copyright 2018 The go-ethereum Authors
// (original work)
// Copyright 2024 The Erigon Authors
// (modifications)
// This file is part of Erigon.
//
// Erigon is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Erigon 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Erigon. If not, see <http://www.gnu.org/licenses/>.

{
    // hist is the map of opcodes to counters
    hist: { },
    // nops counts number of ops
    nops: 0,
        // step is invoked for every opcode that the VM executes.
        step: function(log, db) {
            var op = log.op.toString();
            if (this.hist[op]) {
                this.hist[op]++;
            }
            else {
                this.hist[op] = 1;
            }
            this.nops++;
        },
    // fault is invoked when the actual execution of an opcode fails.
    fault: function(log, db) { },

    // result is invoked when all the opcodes have been iterated over and returns
    // the final result of the tracing.
    result: function(ctx) {
        return this.hist;
    },
}
