mirror of
https://github.com/ethereum/go-ethereum.git
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17d65e9451
This adds a method on vm.EVM to set the jumpdest cache implementation. It can be used to maintain an analysis cache across VM invocations, to improve performance by skipping the analysis for already known contracts. --------- Co-authored-by: lmittmann <lmittmann@users.noreply.github.com> Co-authored-by: Felix Lange <fjl@twurst.com>
107 lines
4 KiB
Go
107 lines
4 KiB
Go
// 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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package vm
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import (
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"math/bits"
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"testing"
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"github.com/ethereum/go-ethereum/crypto"
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)
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func TestJumpDestAnalysis(t *testing.T) {
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tests := []struct {
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code []byte
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exp byte
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which int
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}{
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{[]byte{byte(PUSH1), 0x01, 0x01, 0x01}, 0b0000_0010, 0},
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{[]byte{byte(PUSH1), byte(PUSH1), byte(PUSH1), byte(PUSH1)}, 0b0000_1010, 0},
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{[]byte{0x00, byte(PUSH1), 0x00, byte(PUSH1), 0x00, byte(PUSH1), 0x00, byte(PUSH1)}, 0b0101_0100, 0},
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{[]byte{byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), byte(PUSH8), 0x01, 0x01, 0x01}, bits.Reverse8(0x7F), 0},
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{[]byte{byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0001, 1},
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{[]byte{0x01, 0x01, 0x01, 0x01, 0x01, byte(PUSH2), byte(PUSH2), byte(PUSH2), 0x01, 0x01, 0x01}, 0b1100_0000, 0},
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{[]byte{0x01, 0x01, 0x01, 0x01, 0x01, byte(PUSH2), 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0000, 1},
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{[]byte{byte(PUSH3), 0x01, 0x01, 0x01, byte(PUSH1), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0010_1110, 0},
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{[]byte{byte(PUSH3), 0x01, 0x01, 0x01, byte(PUSH1), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0000, 1},
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{[]byte{0x01, byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b1111_1100, 0},
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{[]byte{0x01, byte(PUSH8), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0011, 1},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b1111_1110, 0},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b1111_1111, 1},
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{[]byte{byte(PUSH16), 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, 0b0000_0001, 2},
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{[]byte{byte(PUSH8), 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, byte(PUSH1), 0x01}, 0b1111_1110, 0},
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{[]byte{byte(PUSH8), 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, byte(PUSH1), 0x01}, 0b0000_0101, 1},
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{[]byte{byte(PUSH32)}, 0b1111_1110, 0},
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{[]byte{byte(PUSH32)}, 0b1111_1111, 1},
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{[]byte{byte(PUSH32)}, 0b1111_1111, 2},
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{[]byte{byte(PUSH32)}, 0b1111_1111, 3},
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{[]byte{byte(PUSH32)}, 0b0000_0001, 4},
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}
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for i, test := range tests {
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ret := codeBitmap(test.code)
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if ret[test.which] != test.exp {
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t.Fatalf("test %d: expected %x, got %02x", i, test.exp, ret[test.which])
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}
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}
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}
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const analysisCodeSize = 1200 * 1024
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func BenchmarkJumpdestAnalysis_1200k(bench *testing.B) {
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// 1.4 ms
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code := make([]byte, analysisCodeSize)
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bench.SetBytes(analysisCodeSize)
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bench.ResetTimer()
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for i := 0; i < bench.N; i++ {
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codeBitmap(code)
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}
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bench.StopTimer()
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}
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func BenchmarkJumpdestHashing_1200k(bench *testing.B) {
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// 4 ms
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code := make([]byte, analysisCodeSize)
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bench.SetBytes(analysisCodeSize)
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bench.ResetTimer()
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for i := 0; i < bench.N; i++ {
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crypto.Keccak256Hash(code)
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}
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bench.StopTimer()
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}
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func BenchmarkJumpdestOpAnalysis(bench *testing.B) {
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var op OpCode
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bencher := func(b *testing.B) {
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code := make([]byte, analysisCodeSize)
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b.SetBytes(analysisCodeSize)
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for i := range code {
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code[i] = byte(op)
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}
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bits := make(BitVec, len(code)/8+1+4)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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clear(bits)
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codeBitmapInternal(code, bits)
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}
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}
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for op = PUSH1; op <= PUSH32; op++ {
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bench.Run(op.String(), bencher)
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}
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op = JUMPDEST
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bench.Run(op.String(), bencher)
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op = STOP
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bench.Run(op.String(), bencher)
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}
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