plugeth/core/vm/memory_test.go

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