github.com/divan/go-ethereum@v1.8.14-0.20180820134928-1de9ada4016d/eth/tracers/internal/tracers/opcount_tracer.js (about) 1 // Copyright 2017 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 // opcountTracer is a sample tracer that just counts the number of instructions 18 // executed by the EVM before the transaction terminated. 19 { 20 // count tracks the number of EVM instructions executed. 21 count: 0, 22 23 // step is invoked for every opcode that the VM executes. 24 step: function(log, db) { this.count++ }, 25 26 // fault is invoked when the actual execution of an opcode fails. 27 fault: function(log, db) { }, 28 29 // result is invoked when all the opcodes have been iterated over and returns 30 // the final result of the tracing. 31 result: function(ctx, db) { return this.count } 32 }