70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
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package vm
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import (
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"bytes"
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"strings"
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"testing"
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"github.com/ethereum/go-ethereum/common"
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)
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func TestMemoryCopy(t *testing.T) {
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// Test cases from https://eips.ethereum.org/EIPS/eip-5656#test-cases
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for i, tc := range []struct {
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dst, src, len uint64
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pre string
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want string
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}{
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{ // MCOPY 0 32 32 - copy 32 bytes from offset 32 to offset 0.
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0, 32, 32,
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"0000000000000000000000000000000000000000000000000000000000000000 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
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"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
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},
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{ // MCOPY 0 0 32 - copy 32 bytes from offset 0 to offset 0.
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0, 0, 32,
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"0101010101010101010101010101010101010101010101010101010101010101",
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"0101010101010101010101010101010101010101010101010101010101010101",
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},
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{ // MCOPY 0 1 8 - copy 8 bytes from offset 1 to offset 0 (overlapping).
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0, 1, 8,
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"000102030405060708 000000000000000000000000000000000000000000000000",
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"010203040506070808 000000000000000000000000000000000000000000000000",
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},
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{ // MCOPY 1 0 8 - copy 8 bytes from offset 0 to offset 1 (overlapping).
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1, 0, 8,
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"000102030405060708 000000000000000000000000000000000000000000000000",
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"000001020304050607 000000000000000000000000000000000000000000000000",
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},
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// Tests below are not in the EIP, but maybe should be added
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{ // MCOPY 0xFFFFFFFFFFFF 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds index(overlapping).
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0xFFFFFFFFFFFF, 0xFFFFFFFFFFFF, 0,
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"11",
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"11",
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},
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{ // MCOPY 0xFFFFFFFFFFFF 0 0 - copy zero bytes from start of mem to out-of-bounds.
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0xFFFFFFFFFFFF, 0, 0,
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"11",
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"11",
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},
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{ // MCOPY 0 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds to start of mem
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0, 0xFFFFFFFFFFFF, 0,
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"11",
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"11",
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},
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} {
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m := NewMemory()
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// Clean spaces
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data := common.FromHex(strings.ReplaceAll(tc.pre, " ", ""))
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// Set pre
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m.Resize(uint64(len(data)))
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m.Set(0, uint64(len(data)), data)
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// Do the copy
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m.Copy(tc.dst, tc.src, tc.len)
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want := common.FromHex(strings.ReplaceAll(tc.want, " ", ""))
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if have := m.store; !bytes.Equal(want, have) {
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t.Errorf("case %d: want: %#x\nhave: %#x\n", i, want, have)
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}
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}
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}
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