mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-29 23:33:37 +00:00
403 lines
7.3 KiB
Go
403 lines
7.3 KiB
Go
package compiler_test
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import (
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"bytes"
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"fmt"
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"math/big"
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"strings"
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"testing"
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"github.com/nspcc-dev/neo-go/pkg/compiler"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/stretchr/testify/require"
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)
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var binaryExprTestCases = []testCase{
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{
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"simple add",
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`func F%d() int {
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x := 2 + 2
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return x
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}
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`,
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big.NewInt(4),
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},
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{
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"simple sub",
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`func F%d() int {
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x := 2 - 2
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return x
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}
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`,
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big.NewInt(0),
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},
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{
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"simple div",
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`func F%d() int {
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x := 2 / 2
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return x
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}
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`,
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big.NewInt(1),
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},
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{
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"simple mod",
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`func F%d() int {
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x := 3 %% 2
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return x
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}
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`,
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big.NewInt(1),
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},
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{
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"simple mul",
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`func F%d() int {
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x := 4 * 2
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return x
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}
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`,
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big.NewInt(8),
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},
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{
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"simple binary expr in return",
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`func F%d() int {
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x := 2
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return 2 + x
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}
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`,
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big.NewInt(4),
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},
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{
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"complex binary expr",
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`func F%d() int {
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x := 4
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y := 8
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z := x + 2 + 2 - 8
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return y * z
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}
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`,
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big.NewInt(0),
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},
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{
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"compare not equal strings with eql",
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`func F%d() int {
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str := "a string"
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if str == "another string" {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(0),
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},
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{
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"compare equal strings with eql",
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`func F%d() int {
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str := "a string"
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if str == "a string" {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(1),
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},
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{
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"compare not equal strings with neq",
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`func F%d() int {
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str := "a string"
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if str != "another string" {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(1),
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},
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{
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"compare equal strings with neq",
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`func F%d() int {
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str := "a string"
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if str != "a string" {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(0),
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},
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{
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"compare equal ints with eql",
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`func F%d() int {
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x := 10
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if x == 10 {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(1),
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},
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{
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"compare equal ints with neq",
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`func F%d() int {
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x := 10
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if x != 10 {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(0),
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},
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{
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"compare not equal ints with eql",
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`func F%d() int {
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x := 11
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if x == 10 {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(0),
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},
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{
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"compare not equal ints with neq",
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`func F%d() int {
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x := 11
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if x != 10 {
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return 1
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}
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return 0
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}
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`,
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big.NewInt(1),
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},
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{
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"simple add and assign",
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`func F%d() int {
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x := 2
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x += 1
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return x
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}
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`,
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big.NewInt(3),
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},
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{
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"simple sub and assign",
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`func F%d() int {
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x := 2
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x -= 1
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return x
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}
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`,
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big.NewInt(1),
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},
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{
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"simple mul and assign",
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`func F%d() int {
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x := 2
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x *= 2
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return x
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}
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`,
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big.NewInt(4),
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},
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{
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"simple div and assign",
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`func F%d() int {
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x := 2
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x /= 2
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return x
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}
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`,
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big.NewInt(1),
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},
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{
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"simple mod and assign",
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`func F%d() int {
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x := 5
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x %%= 2
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return x
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}
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`,
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big.NewInt(1),
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},
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}
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func TestBinaryExprs(t *testing.T) {
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srcBuilder := bytes.NewBuffer([]byte("package testcase\n"))
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for i, tc := range binaryExprTestCases {
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srcBuilder.WriteString(fmt.Sprintf(tc.src, i))
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}
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ne, di, err := compiler.CompileWithOptions("file.go", strings.NewReader(srcBuilder.String()), nil)
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require.NoError(t, err)
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for i, tc := range binaryExprTestCases {
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v := vm.New()
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t.Run(tc.name, func(t *testing.T) {
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v.Istack().Clear()
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v.Estack().Clear()
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invokeMethod(t, fmt.Sprintf("F%d", i), ne.Script, v, di)
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runAndCheck(t, v, tc.result)
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})
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}
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}
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func addBoolExprTestFunc(testCases []testCase, b *bytes.Buffer, val bool, cond string) []testCase {
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n := len(testCases)
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b.WriteString(fmt.Sprintf(`
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func F%d_expr() int {
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var cond%d = %s
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if cond%d { return 42 }
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return 17
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}
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func F%d_cond() int {
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if %s { return 42 }
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return 17
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}
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func F%d_else() int {
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if %s { return 42 } else { return 17 }
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}
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`, n, n, cond, n, n, cond, n, cond))
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res := big.NewInt(42)
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if !val {
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res.SetInt64(17)
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}
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return append(testCases, testCase{
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name: cond,
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result: res,
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})
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}
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func runBooleanCases(t *testing.T, testCases []testCase, src string) {
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ne, di, err := compiler.CompileWithOptions("file.go", strings.NewReader(src), nil)
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require.NoError(t, err)
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for i, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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t.Run("AsExpression", func(t *testing.T) {
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v := vm.New()
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invokeMethod(t, fmt.Sprintf("F%d_expr", i), ne.Script, v, di)
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runAndCheck(t, v, tc.result)
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})
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t.Run("InCondition", func(t *testing.T) {
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v := vm.New()
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invokeMethod(t, fmt.Sprintf("F%d_cond", i), ne.Script, v, di)
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runAndCheck(t, v, tc.result)
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})
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t.Run("InConditionWithElse", func(t *testing.T) {
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v := vm.New()
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invokeMethod(t, fmt.Sprintf("F%d_else", i), ne.Script, v, di)
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runAndCheck(t, v, tc.result)
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})
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})
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}
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}
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// TestBooleanExprs enumerates a lot of possible combinations of boolean expressions
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// and tests if the result matches to that of Go.
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func TestBooleanExprs(t *testing.T) {
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header := `package foo
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var s = "str"
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var v = 9
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`
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srcBuilder := bytes.NewBuffer([]byte(header))
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var testCases []testCase
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trueExpr := []string{"true", "v < 10", "v <= 9", "v > 8", "v >= 9", "v == 9", "v != 8", `s == "str"`}
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falseExpr := []string{"false", "v > 9", "v >= 10", "v < 9", "v <= 8", "v == 8", "v != 9", `s == "a"`}
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t.Run("Single", func(t *testing.T) {
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for _, s := range trueExpr {
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testCases = addBoolExprTestFunc(testCases, srcBuilder, true, s)
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}
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for _, s := range falseExpr {
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testCases = addBoolExprTestFunc(testCases, srcBuilder, false, s)
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}
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runBooleanCases(t, testCases, srcBuilder.String())
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})
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type arg struct {
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val bool
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s string
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}
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var double []arg
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for _, e := range trueExpr {
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double = append(double, arg{true, e + " || false"})
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double = append(double, arg{true, e + " && true"})
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}
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for _, e := range falseExpr {
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double = append(double, arg{false, e + " && true"})
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double = append(double, arg{false, e + " || false"})
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}
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t.Run("Double", func(t *testing.T) {
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testCases = testCases[:0]
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srcBuilder.Reset()
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srcBuilder.WriteString(header)
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for i := range double {
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testCases = addBoolExprTestFunc(testCases, srcBuilder, double[i].val, double[i].s)
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}
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runBooleanCases(t, testCases, srcBuilder.String())
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})
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var triple []arg
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for _, a1 := range double {
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for _, a2 := range double {
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triple = append(triple, arg{a1.val || a2.val, fmt.Sprintf("(%s) || (%s)", a1.s, a2.s)})
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triple = append(triple, arg{a1.val && a2.val, fmt.Sprintf("(%s) && (%s)", a1.s, a2.s)})
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}
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}
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t.Run("Triple", func(t *testing.T) {
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const step = 350 // empirically found value to make script less than 65536 in size
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for start := 0; start < len(triple); start += step {
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testCases = testCases[:0]
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srcBuilder.Reset()
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srcBuilder.WriteString(header)
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for i := start; i < start+step && i < len(triple); i++ {
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testCases = addBoolExprTestFunc(testCases, srcBuilder, triple[i].val, triple[i].s)
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}
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runBooleanCases(t, testCases, srcBuilder.String())
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}
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})
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}
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func TestShortCircuit(t *testing.T) {
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srcTmpl := `package foo
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var a = 1
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func inc() bool { a += 1; return %s }
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func Main() int {
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if %s {
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return 41 + a
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}
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return 16 + a
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}`
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t.Run("||", func(t *testing.T) {
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src := fmt.Sprintf(srcTmpl, "true", "a == 1 || inc()")
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eval(t, src, big.NewInt(42))
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})
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t.Run("&&", func(t *testing.T) {
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src := fmt.Sprintf(srcTmpl, "false", "a == 2 && inc()")
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eval(t, src, big.NewInt(17))
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})
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}
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func TestEmitBoolean(t *testing.T) {
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src := `package foo
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func Main() int {
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a := true
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if (a == true) == true {
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return 42
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}
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return 11
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}`
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eval(t, src, big.NewInt(42))
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}
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