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