github.com/divan/go-ethereum@v1.8.14-0.20180820134928-1de9ada4016d/eth/tracers/internal/tracers/unigram_tracer.js (about) 1 // Copyright 2018 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 { 18 // hist is the map of opcodes to counters 19 hist: {}, 20 // nops counts number of ops 21 nops: 0, 22 // step is invoked for every opcode that the VM executes. 23 step: function(log, db) { 24 var op = log.op.toString(); 25 if (this.hist[op]){ 26 this.hist[op]++; 27 } 28 else { 29 this.hist[op] = 1; 30 } 31 this.nops++; 32 }, 33 // fault is invoked when the actual execution of an opcode fails. 34 fault: function(log, db) {}, 35 36 // result is invoked when all the opcodes have been iterated over and returns 37 // the final result of the tracing. 38 result: function(ctx) { 39 if(this.nops > 0){ 40 return this.hist; 41 } 42 }, 43 }