50 lines
1.7 KiB
JavaScript
50 lines
1.7 KiB
JavaScript
// 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 trigram counters
|
|
hist: {},
|
|
// lastOp is last operation
|
|
lastOps: ['',''],
|
|
lastDepth: 0,
|
|
// step is invoked for every opcode that the VM executes.
|
|
step: function(log, db) {
|
|
var depth = log.getDepth();
|
|
if (depth != this.lastDepth){
|
|
this.lastOps = ['',''];
|
|
this.lastDepth = depth;
|
|
return;
|
|
}
|
|
var op = log.op.toString();
|
|
var key = this.lastOps[0]+'-'+this.lastOps[1]+'-'+op;
|
|
if (this.hist[key]){
|
|
this.hist[key]++;
|
|
}
|
|
else {
|
|
this.hist[key] = 1;
|
|
}
|
|
this.lastOps[0] = this.lastOps[1];
|
|
this.lastOps[1] = op;
|
|
},
|
|
// 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;
|
|
},
|
|
}
|