neo-go/pkg/compiler/slice_test.go

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package compiler_test
import (
"bytes"
"fmt"
"math/big"
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"strings"
"testing"
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"github.com/nspcc-dev/neo-go/pkg/compiler"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"github.com/stretchr/testify/require"
)
var sliceTestCases = []testCase{
{
"constant index",
`func F%d() int {
a := []int{0,0}
a[1] = 42
return a[1]+0
}
`,
big.NewInt(42),
},
{
"variable index",
`func F%d() int {
a := []int{0,0}
i := 1
a[i] = 42
return a[1]+0
}
`,
big.NewInt(42),
},
{
"increase slice element with +=",
`func F%d() int {
a := []int{1, 2, 3}
a[1] += 40
return a[1]
}
`,
big.NewInt(42),
},
{
"complex test",
`func F%d() int {
a := []int{1,2,3}
x := a[0]
a[x] = a[x] + 4
a[x] = a[x] + a[2]
return a[1]
}
`,
big.NewInt(9),
},
{
"slice literals with variables",
`func F%d() int {
elem := 7
a := []int{6, elem, 8}
return a[1]
}
`,
big.NewInt(7),
},
{
"slice literals with expressions",
`func F%d() int {
elem := []int{3, 7}
a := []int{6, elem[1]*2+1, 24}
return a[1]
}
`,
big.NewInt(15),
},
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{
"sub-slice with literal bounds",
`func F%d() []byte {
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a := []byte{0, 1, 2, 3}
b := a[1:3]
return b
}
`,
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[]byte{1, 2},
},
{
"sub-slice with constant bounds",
`const x = 1
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const y = 3
func F%d() []byte {
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a := []byte{0, 1, 2, 3}
b := a[x:y]
return b
}
`,
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[]byte{1, 2},
},
{
"sub-slice with variable bounds",
`func F%d() []byte {
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a := []byte{0, 1, 2, 3}
x := 1
y := 3
b := a[x:y]
return b
}
`,
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[]byte{1, 2},
},
{
"sub-slice with no lower bound",
`func F%d() []byte {
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a := []byte{0, 1, 2, 3}
b := a[:3]
return b
}
`,
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[]byte{0, 1, 2},
},
{
"sub-slice with no upper bound",
`func F%d() []byte {
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a := []byte{0, 1, 2, 3}
b := a[2:]
return b
}
`,
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[]byte{2, 3},
},
{
"declare byte slice",
`func F%d() []byte {
var a []byte
a = append(a, 1)
a = append(a, 2)
return a
}
`,
[]byte{1, 2},
},
{
"append multiple bytes to a slice",
`func F%d() []byte {
var a []byte
a = append(a, 1, 2)
return a
}
`,
[]byte{1, 2},
},
{
"append multiple ints to a slice",
`func F%d() []int {
var a []int
a = append(a, 1, 2, 3)
a = append(a, 4, 5)
return a
}
`,
[]stackitem.Item{
stackitem.NewBigInteger(big.NewInt(1)),
stackitem.NewBigInteger(big.NewInt(2)),
stackitem.NewBigInteger(big.NewInt(3)),
stackitem.NewBigInteger(big.NewInt(4)),
stackitem.NewBigInteger(big.NewInt(5)),
},
},
{
"int slice, append slice",
` func getByte() byte { return 0x80 }
func F%d() []int {
x := []int{1}
y := []int{2, 3}
x = append(x, y...)
x = append(x, y...)
return x
}
`,
[]stackitem.Item{
stackitem.Make(1),
stackitem.Make(2), stackitem.Make(3),
stackitem.Make(2), stackitem.Make(3),
},
},
{
"declare compound slice",
`func F%d() []string {
var a []string
a = append(a, "a")
a = append(a, "b")
return a
}
`,
[]stackitem.Item{
stackitem.NewByteArray([]byte("a")),
stackitem.NewByteArray([]byte("b")),
},
},
{
"declare compound slice alias",
`type strs []string
func F%d() []string {
var a strs
a = append(a, "a")
a = append(a, "b")
return a
}
`,
[]stackitem.Item{
stackitem.NewByteArray([]byte("a")),
stackitem.NewByteArray([]byte("b")),
},
},
{
"byte-slice assignment",
`func F%d() []byte {
a := []byte{0, 1, 2}
a[1] = 42
return a
}
`,
[]byte{0, 42, 2},
},
{
"byte-slice assignment after string conversion",
`func F%d() []byte {
a := "abc"
b := []byte(a)
b[1] = 42
return []byte(a)
}
`,
[]byte{0x61, 0x62, 0x63},
},
{
"declare and append byte-slice",
`func F%d() []byte {
var a []byte
a = append(a, 1)
a = append(a, 2)
return a
}
`,
[]byte{1, 2},
},
{
"nested slice assignment",
`func F%d() int {
a := [][]int{[]int{1, 2}, []int{3, 4}}
a[1][0] = 42
return a[1][0]
}
`,
big.NewInt(42),
},
{
"nested slice omitted type (slice)",
`func F%d() int {
a := [][]int{{1, 2}, {3, 4}}
a[1][0] = 42
return a[1][0]
}
`,
big.NewInt(42),
},
{
"nested slice omitted type (struct)",
`type pairA struct { a, b int }
func F%d() int {
a := []pairA{{a: 1, b: 2}, {a: 3, b: 4}}
a[1].a = 42
return a[1].a
}
`,
big.NewInt(42),
},
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{
"defaults to nil for byte slice",
`func F%d() int {
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var a []byte
if a != nil { return 1}
return 2
}
`,
big.NewInt(2),
},
{
"defaults to nil for int slice",
`func F%d() int {
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var a []int
if a != nil { return 1}
return 2
}
`,
big.NewInt(2),
},
{
"defaults to nil for struct slice",
`type pairB struct { a, b int }
func F%d() int {
var a []pairB
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if a != nil { return 1}
return 2
}
`,
big.NewInt(2),
},
{
"literal byte-slice with variable values",
`const sym1 = 's'
func F%d() []byte {
sym2 := byte('t')
sym4 := byte('i')
return []byte{sym1, sym2, 'r', sym4, 'n', 'g'}
}
`,
[]byte("string"),
},
{
"literal slice with function call",
`func fn() byte { return 't' }
func F%d() []byte {
return []byte{'s', fn(), 'r'}
}
`,
[]byte("str"),
},
}
func TestSliceOperations(t *testing.T) {
srcBuilder := bytes.NewBuffer([]byte("package testcase\n"))
for i, tc := range sliceTestCases {
srcBuilder.WriteString(fmt.Sprintf(tc.src, i))
}
ne, di, err := compiler.CompileWithOptions("file.go", strings.NewReader(srcBuilder.String()), nil)
require.NoError(t, err)
for i, tc := range sliceTestCases {
t.Run(tc.name, func(t *testing.T) {
v := vm.New()
invokeMethod(t, fmt.Sprintf("F%d", i), ne.Script, v, di)
runAndCheck(t, v, tc.result)
})
}
}
func TestByteSlices(t *testing.T) {
testCases := []testCase{
{
"append bytes bigger than 0x79",
`package foo
func Main() []byte {
var z []byte
z = append(z, 0x78, 0x79, 0x80, 0x81, 0xFF)
return z
}`,
[]byte{0x78, 0x79, 0x80, 0x81, 0xFF},
},
{
"append bytes bigger than 0x79, not nil",
`package foo
func Main() []byte {
z := []byte{0x78}
z = append(z, 0x79, 0x80, 0x81, 0xFF)
return z
}`,
[]byte{0x78, 0x79, 0x80, 0x81, 0xFF},
},
{
"append bytes bigger than 0x79, function return",
`package foo
func getByte() byte { return 0x80 }
func Main() []byte {
var z []byte
z = append(z, 0x78, 0x79, getByte(), 0x81, 0xFF)
return z
}`,
[]byte{0x78, 0x79, 0x80, 0x81, 0xFF},
},
{
"append ints bigger than 0x79, function return byte",
`package foo
func getByte() byte { return 0x80 }
func Main() []int {
var z []int
z = append(z, 0x78, int(getByte()))
return z
}`,
[]stackitem.Item{stackitem.Make(0x78), stackitem.Make(0x80)},
},
{
"slice literal, bytes bigger than 0x79, function return",
`package foo
func getByte() byte { return 0x80 }
func Main() []byte {
z := []byte{0x79, getByte(), 0x81}
return z
}`,
[]byte{0x79, 0x80, 0x81},
},
{
"compare bytes as integers",
`package foo
func getByte1() byte { return 0x79 }
func getByte2() byte { return 0x80 }
func Main() bool {
return getByte1() < getByte2()
}`,
true,
},
}
runTestCases(t, testCases)
}
func TestSubsliceCompound(t *testing.T) {
src := `package foo
func Main() []int {
a := []int{0, 1, 2, 3}
b := a[1:3]
return b
}`
_, err := compiler.Compile("", strings.NewReader(src))
require.Error(t, err)
}
func TestSubsliceFromStructField(t *testing.T) {
src := `package foo
type pair struct { key, value []byte }
func Main() []byte {
p := pair{ []byte{1}, []byte{4, 8, 15, 16, 23, 42} }
return p.value[2:4]
}`
eval(t, src, []byte{15, 16})
}
func TestRemove(t *testing.T) {
t.Run("Valid", func(t *testing.T) {
src := `package foo
import "github.com/nspcc-dev/neo-go/pkg/interop/util"
func Main() int {
a := []int{11, 22, 33}
util.Remove(a, 1)
return len(a) + a[0] + a[1]
}`
eval(t, src, big.NewInt(46))
})
t.Run("ByteSlice", func(t *testing.T) {
// This test checks that `Remove` has correct arguments.
// After `Remove` became an opcode it is harder to do such checks.
// Skip the test for now.
t.Skip()
src := `package foo
import "github.com/nspcc-dev/neo-go/pkg/interop/util"
func Main() int {
a := []byte{11, 22, 33}
util.Remove(a, 1)
return len(a)
}`
_, err := compiler.Compile("", strings.NewReader(src))
require.Error(t, err)
})
}
func TestJumps(t *testing.T) {
src := `
package foo
func Main() []byte {
buf := []byte{0x62, 0x01, 0x00}
return buf
}
`
eval(t, src, []byte{0x62, 0x01, 0x00})
}
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func TestMake(t *testing.T) {
t.Run("Map", func(t *testing.T) {
src := `package foo
func Main() int {
a := make(map[int]int)
a[1] = 10
a[2] = 20
return a[1]
}`
eval(t, src, big.NewInt(10))
})
t.Run("IntSlice", func(t *testing.T) {
src := `package foo
func Main() int {
a := make([]int, 10)
return len(a) + a[0]
}`
eval(t, src, big.NewInt(10))
})
t.Run("ByteSlice", func(t *testing.T) {
src := `package foo
func Main() int {
a := make([]byte, 10)
return len(a) + int(a[0])
}`
eval(t, src, big.NewInt(10))
})
t.Run("CapacityError", func(t *testing.T) {
src := `package foo
func Main() int {
a := make([]int, 1, 2)
return a[0]
}`
_, err := compiler.Compile("foo.go", strings.NewReader(src))
require.Error(t, err)
})
}
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func TestCopy(t *testing.T) {
t.Run("Invalid", func(t *testing.T) {
src := `package foo
func Main() []int {
src := []int{3, 2, 1}
dst := make([]int, 2)
copy(dst, src)
return dst
}`
_, err := compiler.Compile("foo.go", strings.NewReader(src))
require.Error(t, err)
})
t.Run("Simple", func(t *testing.T) {
src := `package foo
func Main() []byte {
src := []byte{3, 2, 1}
dst := make([]byte, 2)
copy(dst, src)
return dst
}`
eval(t, src, []byte{3, 2})
})
t.Run("LowSrcIndex", func(t *testing.T) {
src := `package foo
func Main() []byte {
src := []byte{3, 2, 1}
dst := make([]byte, 2)
copy(dst, src[1:])
return dst
}`
eval(t, src, []byte{2, 1})
})
t.Run("LowDstIndex", func(t *testing.T) {
src := `package foo
func Main() []byte {
src := []byte{3, 2, 1}
dst := make([]byte, 2)
copy(dst[1:], src[1:])
return dst
}`
eval(t, src, []byte{0, 2})
})
t.Run("BothIndices", func(t *testing.T) {
src := `package foo
func Main() []byte {
src := []byte{4, 3, 2, 1}
dst := make([]byte, 4)
copy(dst[1:], src[1:3])
return dst
}`
eval(t, src, []byte{0, 3, 2, 0})
})
t.Run("EmptySliceExpr", func(t *testing.T) {
src := `package foo
func Main() []byte {
src := []byte{3, 2, 1}
dst := make([]byte, 2)
copy(dst[1:], src[:])
return dst
}`
eval(t, src, []byte{0, 3})
})
t.Run("AssignToVariable", func(t *testing.T) {
src := `package foo
func Main() int {
src := []byte{3, 2, 1}
dst := make([]byte, 2)
n := copy(dst, src)
return n
}`
eval(t, src, big.NewInt(2))
})
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}