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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library 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.
//
// The go-ethereum library 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 the go-ethereum library. 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) {
if(this.nops > 0){
return this.hist;
}
},
}
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