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86 lines
2.9 KiB
86 lines
2.9 KiB
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// 4byteTracer searches for 4byte-identifiers, and collects them for post-processing.
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// It collects the methods identifiers along with the size of the supplied data, so
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// a reversed signature can be matched against the size of the data.
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//
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// Example:
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// > debug.traceTransaction( "0x214e597e35da083692f5386141e69f47e973b2c56e7a8073b1ea08fd7571e9de", {tracer: "4byteTracer"})
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// {
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// 0x27dc297e-128: 1,
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// 0x38cc4831-0: 2,
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// 0x524f3889-96: 1,
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// 0xadf59f99-288: 1,
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// 0xc281d19e-0: 1
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// }
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{
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// ids aggregates the 4byte ids found.
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ids : {},
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// callType returns 'false' for non-calls, or the peek-index for the first param
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// after 'value', i.e. meminstart.
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callType: function(opstr){
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switch(opstr){
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case "CALL": case "CALLCODE":
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// gas, addr, val, memin, meminsz, memout, memoutsz
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return 3; // stack ptr to memin
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case "DELEGATECALL": case "STATICCALL":
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// gas, addr, memin, meminsz, memout, memoutsz
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return 2; // stack ptr to memin
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}
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return false;
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},
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// store save the given indentifier and datasize.
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store: function(id, size){
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var key = "" + toHex(id) + "-" + size;
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this.ids[key] = this.ids[key] + 1 || 1;
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},
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// step is invoked for every opcode that the VM executes.
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step: function(log, db) {
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// Skip any opcodes that are not internal calls
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var ct = this.callType(log.op.toString());
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if (!ct) {
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return;
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}
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// Skip any pre-compile invocations, those are just fancy opcodes
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if (isPrecompiled(toAddress(log.stack.peek(1).toString(16)))) {
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return;
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}
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// Gather internal call details
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var inSz = log.stack.peek(ct + 1).valueOf();
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if (inSz >= 4) {
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var inOff = log.stack.peek(ct).valueOf();
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this.store(log.memory.slice(inOff, inOff + 4), inSz-4);
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}
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},
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// fault is invoked when the actual execution of an opcode fails.
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fault: function(log, db) { },
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// result is invoked when all the opcodes have been iterated over and returns
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// the final result of the tracing.
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result: function(ctx) {
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// Save the outer calldata also
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if (ctx.input.length >= 4) {
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this.store(slice(ctx.input, 0, 4), ctx.input.length-4)
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}
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return this.ids;
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},
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}
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