mirror of
https://github.com/nspcc-dev/neo-go.git
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c72b3f2176
Fix a bug where big integer could be emitted as 0 without reporting an error. Also, add tests. Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
362 lines
9.8 KiB
Go
362 lines
9.8 KiB
Go
package emit
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import (
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"encoding/binary"
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"errors"
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"math"
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"math/big"
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"testing"
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"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
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"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestEmitInt(t *testing.T) {
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t.Run("minis one", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, -1)
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result := buf.Bytes()
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assert.Len(t, result, 1)
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assert.EqualValues(t, opcode.PUSHM1, result[0])
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})
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t.Run("zero", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, 0)
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result := buf.Bytes()
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assert.Len(t, result, 1)
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assert.EqualValues(t, opcode.PUSH0, result[0])
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})
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t.Run("1-byte int", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, 10)
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result := buf.Bytes()
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assert.EqualValues(t, opcode.PUSH10, result[0])
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})
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t.Run("big 1-byte int", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, 42)
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result := buf.Bytes()
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assert.EqualValues(t, opcode.PUSHINT8, result[0])
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assert.EqualValues(t, 42, result[1])
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})
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t.Run("2-byte int", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, 300)
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result := buf.Bytes()
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assert.Equal(t, 3, len(result))
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assert.EqualValues(t, opcode.PUSHINT16, result[0])
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assert.EqualValues(t, 300, bigint.FromBytes(result[1:]).Int64())
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})
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t.Run("3-byte int", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, 1<<20)
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result := buf.Bytes()
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assert.Equal(t, 5, len(result))
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assert.EqualValues(t, opcode.PUSHINT32, result[0])
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assert.EqualValues(t, 1<<20, bigint.FromBytes(result[1:]).Int64())
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})
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t.Run("4-byte int", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, 1<<28)
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result := buf.Bytes()
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assert.Equal(t, 5, len(result))
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assert.EqualValues(t, opcode.PUSHINT32, result[0])
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assert.EqualValues(t, 1<<28, bigint.FromBytes(result[1:]).Int64())
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})
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t.Run("negative 3-byte int with padding", func(t *testing.T) {
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const num = -(1 << 23)
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buf := io.NewBufBinWriter()
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Int(buf.BinWriter, num)
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result := buf.Bytes()
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assert.Equal(t, 5, len(result))
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assert.EqualValues(t, opcode.PUSHINT32, result[0])
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assert.EqualValues(t, num, bigint.FromBytes(result[1:]).Int64())
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})
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}
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func TestEmitBigInt(t *testing.T) {
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t.Run("biggest positive number", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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bi := big.NewInt(1)
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bi.Lsh(bi, 255)
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bi.Sub(bi, big.NewInt(1))
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// sanity check
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require.NotPanics(t, func() { stackitem.NewBigInteger(bi) })
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BigInt(buf.BinWriter, bi)
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require.NoError(t, buf.Err)
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expected := make([]byte, 33)
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expected[0] = byte(opcode.PUSHINT256)
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for i := 1; i < 32; i++ {
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expected[i] = 0xFF
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}
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expected[32] = 0x7F
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require.Equal(t, expected, buf.Bytes())
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})
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t.Run("smallest negative number", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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bi := big.NewInt(-1)
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bi.Lsh(bi, 255)
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// sanity check
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require.NotPanics(t, func() { stackitem.NewBigInteger(bi) })
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BigInt(buf.BinWriter, bi)
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require.NoError(t, buf.Err)
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expected := make([]byte, 33)
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expected[0] = byte(opcode.PUSHINT256)
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expected[32] = 0x80
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require.Equal(t, expected, buf.Bytes())
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})
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t.Run("biggest positive number plus 1", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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bi := big.NewInt(1)
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bi.Lsh(bi, 255)
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// sanity check
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require.Panics(t, func() { stackitem.NewBigInteger(bi) })
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BigInt(buf.BinWriter, bi)
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require.Error(t, buf.Err)
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t.Run("do not clear previous error", func(t *testing.T) {
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buf.Reset()
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expected := errors.New("expected")
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buf.Err = expected
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BigInt(buf.BinWriter, bi)
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require.Equal(t, expected, buf.Err)
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})
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})
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t.Run("smallest negative number minus 1", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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bi := big.NewInt(-1)
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bi.Lsh(bi, 255)
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bi.Sub(bi, big.NewInt(1))
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// sanity check
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require.Panics(t, func() { stackitem.NewBigInteger(bi) })
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BigInt(buf.BinWriter, bi)
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require.Error(t, buf.Err)
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})
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}
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func getSlice(n int) []byte {
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data := make([]byte, n)
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for i := range data {
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data[i] = byte(i)
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}
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return data
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}
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func TestBytes(t *testing.T) {
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t.Run("small slice", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Bytes(buf.BinWriter, []byte{0, 1, 2, 3})
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result := buf.Bytes()
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assert.EqualValues(t, opcode.PUSHDATA1, result[0])
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assert.EqualValues(t, 4, result[1])
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assert.EqualValues(t, []byte{0, 1, 2, 3}, result[2:])
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})
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t.Run("slice with len <= 255", func(t *testing.T) {
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const size = 200
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buf := io.NewBufBinWriter()
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Bytes(buf.BinWriter, getSlice(size))
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result := buf.Bytes()
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assert.EqualValues(t, opcode.PUSHDATA1, result[0])
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assert.EqualValues(t, size, result[1])
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assert.Equal(t, getSlice(size), result[2:])
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})
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t.Run("slice with len <= 65535", func(t *testing.T) {
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const size = 60000
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buf := io.NewBufBinWriter()
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Bytes(buf.BinWriter, getSlice(size))
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result := buf.Bytes()
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assert.EqualValues(t, opcode.PUSHDATA2, result[0])
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assert.EqualValues(t, size, binary.LittleEndian.Uint16(result[1:3]))
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assert.Equal(t, getSlice(size), result[3:])
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})
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t.Run("slice with len > 65535", func(t *testing.T) {
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const size = 100000
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buf := io.NewBufBinWriter()
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Bytes(buf.BinWriter, getSlice(size))
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result := buf.Bytes()
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assert.EqualValues(t, opcode.PUSHDATA4, result[0])
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assert.EqualValues(t, size, binary.LittleEndian.Uint32(result[1:5]))
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assert.Equal(t, getSlice(size), result[5:])
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})
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}
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func TestEmitArray(t *testing.T) {
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t.Run("good", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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veryBig := new(big.Int).SetUint64(math.MaxUint64)
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veryBig.Add(veryBig, big.NewInt(1))
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Array(buf.BinWriter, big.NewInt(0), veryBig,
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[]interface{}{int64(1), int64(2)}, nil, int64(1), "str", true, []byte{0xCA, 0xFE})
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require.NoError(t, buf.Err)
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res := buf.Bytes()
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assert.EqualValues(t, opcode.PUSHDATA1, res[0])
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assert.EqualValues(t, 2, res[1])
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assert.EqualValues(t, []byte{0xCA, 0xFE}, res[2:4])
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assert.EqualValues(t, opcode.PUSHT, res[4])
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assert.EqualValues(t, opcode.CONVERT, res[5])
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assert.EqualValues(t, stackitem.BooleanT, res[6])
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assert.EqualValues(t, opcode.PUSHDATA1, res[7])
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assert.EqualValues(t, 3, res[8])
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assert.EqualValues(t, []byte("str"), res[9:12])
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assert.EqualValues(t, opcode.PUSH1, res[12])
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assert.EqualValues(t, opcode.PUSHNULL, res[13])
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assert.EqualValues(t, opcode.PUSH2, res[14])
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assert.EqualValues(t, opcode.PUSH1, res[15])
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assert.EqualValues(t, opcode.PUSH2, res[16])
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assert.EqualValues(t, opcode.PACK, res[17])
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assert.EqualValues(t, opcode.PUSHINT128, res[18])
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assert.EqualValues(t, veryBig, bigint.FromBytes(res[19:35]))
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assert.EqualValues(t, opcode.PUSH0, res[35])
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})
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t.Run("empty", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Array(buf.BinWriter)
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require.NoError(t, buf.Err)
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assert.EqualValues(t, []byte{byte(opcode.NEWARRAY0)}, buf.Bytes())
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})
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t.Run("invalid type", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Array(buf.BinWriter, struct{}{})
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require.Error(t, buf.Err)
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})
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}
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func TestEmitBool(t *testing.T) {
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buf := io.NewBufBinWriter()
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Bool(buf.BinWriter, true)
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Bool(buf.BinWriter, false)
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result := buf.Bytes()
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assert.EqualValues(t, opcode.PUSH1, result[0])
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assert.EqualValues(t, opcode.CONVERT, result[1])
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assert.EqualValues(t, stackitem.BooleanT, result[2])
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assert.EqualValues(t, opcode.PUSH0, result[3])
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assert.EqualValues(t, opcode.CONVERT, result[4])
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assert.EqualValues(t, stackitem.BooleanT, result[5])
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}
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func TestEmitOpcode(t *testing.T) {
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w := io.NewBufBinWriter()
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Opcodes(w.BinWriter, opcode.PUSH1, opcode.NEWMAP)
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result := w.Bytes()
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assert.Equal(t, result, []byte{byte(opcode.PUSH1), byte(opcode.NEWMAP)})
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}
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func TestEmitString(t *testing.T) {
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buf := io.NewBufBinWriter()
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str := "City Of Zion"
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String(buf.BinWriter, str)
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assert.Equal(t, buf.Len(), len(str)+2)
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assert.Equal(t, buf.Bytes()[2:], []byte(str))
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}
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func TestEmitSyscall(t *testing.T) {
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syscalls := []string{
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interopnames.SystemRuntimeLog,
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interopnames.SystemRuntimeNotify,
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"System.Runtime.Whatever",
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}
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buf := io.NewBufBinWriter()
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for _, syscall := range syscalls {
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Syscall(buf.BinWriter, syscall)
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result := buf.Bytes()
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assert.Equal(t, 5, len(result))
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assert.Equal(t, opcode.Opcode(result[0]), opcode.SYSCALL)
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assert.Equal(t, binary.LittleEndian.Uint32(result[1:]), interopnames.ToID([]byte(syscall)))
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buf.Reset()
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}
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t.Run("empty syscall", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Syscall(buf.BinWriter, "")
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assert.Error(t, buf.Err)
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})
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t.Run("empty syscall after error", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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err := errors.New("first error")
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buf.Err = err
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Syscall(buf.BinWriter, "")
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assert.Equal(t, err, buf.Err)
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})
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}
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func TestJmp(t *testing.T) {
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const label = 0x23
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t.Run("correct", func(t *testing.T) {
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ops := []opcode.Opcode{opcode.JMP, opcode.JMPIF, opcode.JMPIFNOT, opcode.CALL}
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for i := range ops {
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t.Run(ops[i].String(), func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Jmp(buf.BinWriter, ops[i], label)
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assert.NoError(t, buf.Err)
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result := buf.Bytes()
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assert.EqualValues(t, ops[i], result[0])
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assert.EqualValues(t, 0x23, binary.LittleEndian.Uint16(result[1:]))
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})
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}
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})
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t.Run("not a jump instruction", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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Jmp(buf.BinWriter, opcode.ABS, label)
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assert.Error(t, buf.Err)
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})
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t.Run("not a jump after error", func(t *testing.T) {
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buf := io.NewBufBinWriter()
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err := errors.New("first error")
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buf.Err = err
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Jmp(buf.BinWriter, opcode.ABS, label)
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assert.Error(t, buf.Err)
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})
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}
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func TestEmitCall(t *testing.T) {
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buf := io.NewBufBinWriter()
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Call(buf.BinWriter, opcode.JMP, 100)
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result := buf.Bytes()
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assert.Equal(t, opcode.Opcode(result[0]), opcode.JMP)
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label := binary.LittleEndian.Uint16(result[1:3])
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assert.Equal(t, label, uint16(100))
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}
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