plugeth/core/vm/jump_table_test.go
yihuang 7dc5e785a8
core/vm: deepcopy jumptable when enabling extra eips (#26137)
When the interpreter is configured to use extra-eips, this change makes it so that all the opcodes are deep-copied, to prevent accidental modification of the 'base' jumptable. 

Closes: #26136

Co-authored-by: Martin Holst Swende <martin@swende.se>
2022-11-09 07:52:13 +01:00

36 lines
1.3 KiB
Go

// Copyright 2022 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/>.
package vm
import (
"testing"
"github.com/stretchr/testify/require"
)
// TestJumpTableCopy tests that deep copy is necessery to prevent modify shared jump table
func TestJumpTableCopy(t *testing.T) {
tbl := newMergeInstructionSet()
require.Equal(t, uint64(0), tbl[SLOAD].constantGas)
// a deep copy won't modify the shared jump table
deepCopy := copyJumpTable(&tbl)
deepCopy[SLOAD].constantGas = 100
require.Equal(t, uint64(100), deepCopy[SLOAD].constantGas)
require.Equal(t, uint64(0), tbl[SLOAD].constantGas)
}