third_party/gofrontend/libgo/go/go/constant/value_test.go - llvm-project/llgo - Git at Google

 // Copyright 2013 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 package constant

 import (
 	"go/token"
 	"strings"
 	"testing"
 )

 // TODO(gri) expand this test framework

 var opTests = []string{
 	// unary operations
 	`+ 0 = 0`,
 	`+ ? = ?`,
 	`- 1 = -1`,
 	`- ? = ?`,
 	`^ 0 = -1`,
 	`^ ? = ?`,

 	`! true = false`,
 	`! false = true`,
 	`! ? = ?`,

 	// etc.

 	// binary operations
 	`"" + "" = ""`,
 	`"foo" + "" = "foo"`,
 	`"" + "bar" = "bar"`,
 	`"foo" + "bar" = "foobar"`,

 	`0 + 0 = 0`,
 	`0 + 0.1 = 0.1`,
 	`0 + 0.1i = 0.1i`,
 	`0.1 + 0.9 = 1`,
 	`1e100 + 1e100 = 2e100`,
 	`? + 0 = ?`,
 	`0 + ? = ?`,

 	`0 - 0 = 0`,
 	`0 - 0.1 = -0.1`,
 	`0 - 0.1i = -0.1i`,
 	`1e100 - 1e100 = 0`,
 	`? - 0 = ?`,
 	`0 - ? = ?`,

 	`0 * 0 = 0`,
 	`1 * 0.1 = 0.1`,
 	`1 * 0.1i = 0.1i`,
 	`1i * 1i = -1`,
 	`? * 0 = ?`,
 	`0 * ? = ?`,

 	`0 / 0 = "division_by_zero"`,
 	`10 / 2 = 5`,
 	`5 / 3 = 5/3`,
 	`5i / 3i = 5/3`,
 	`? / 0 = ?`,
 	`0 / ? = ?`,

 	`0 % 0 = "runtime_error:_integer_divide_by_zero"`, // TODO(gri) should be the same as for /
 	`10 % 3 = 1`,
 	`? % 0 = ?`,
 	`0 % ? = ?`,

 	`0 & 0 = 0`,
 	`12345 & 0 = 0`,
 	`0xff & 0xf = 0xf`,
 	`? & 0 = ?`,
 	`0 & ? = ?`,

 	`0 | 0 = 0`,
 	`12345 | 0 = 12345`,
 	`0xb | 0xa0 = 0xab`,
 	`? | 0 = ?`,
 	`0 | ? = ?`,

 	`0 ^ 0 = 0`,
 	`1 ^ -1 = -2`,
 	`? ^ 0 = ?`,
 	`0 ^ ? = ?`,

 	`0 &^ 0 = 0`,
 	`0xf &^ 1 = 0xe`,
 	`1 &^ 0xf = 0`,
 	// etc.

 	// shifts
 	`0 << 0 = 0`,
 	`1 << 10 = 1024`,
 	`0 >> 0 = 0`,
 	`1024 >> 10 == 1`,
 	`? << 0 == ?`,
 	`? >> 10 == ?`,
 	// etc.

 	// comparisons
 	`false == false = true`,
 	`false == true = false`,
 	`true == false = false`,
 	`true == true = true`,

 	`false != false = false`,
 	`false != true = true`,
 	`true != false = true`,
 	`true != true = false`,

 	`"foo" == "bar" = false`,
 	`"foo" != "bar" = true`,
 	`"foo" < "bar" = false`,
 	`"foo" <= "bar" = false`,
 	`"foo" > "bar" = true`,
 	`"foo" >= "bar" = true`,

 	`0 == 0 = true`,
 	`0 != 0 = false`,
 	`0 < 10 = true`,
 	`10 <= 10 = true`,
 	`0 > 10 = false`,
 	`10 >= 10 = true`,

 	`1/123456789 == 1/123456789 == true`,
 	`1/123456789 != 1/123456789 == false`,
 	`1/123456789 < 1/123456788 == true`,
 	`1/123456788 <= 1/123456789 == false`,
 	`0.11 > 0.11 = false`,
 	`0.11 >= 0.11 = true`,

 	`? == 0 = false`,
 	`? != 0 = false`,
 	`? < 10 = false`,
 	`? <= 10 = false`,
 	`? > 10 = false`,
 	`? >= 10 = false`,

 	`0 == ? = false`,
 	`0 != ? = false`,
 	`0 < ? = false`,
 	`10 <= ? = false`,
 	`0 > ? = false`,
 	`10 >= ? = false`,

 	// etc.
 }

 func TestOps(t *testing.T) {
 	for _, test := range opTests {
 		a := strings.Split(test, " ")
 		i := 0 // operator index

 		var x, x0 Value
 		switch len(a) {
 		case 4:
 			// unary operation
 		case 5:
 			// binary operation
 			x, x0 = val(a[0]), val(a[0])
 			i = 1
 		default:
 			t.Errorf("invalid test case: %s", test)
 			continue
 		}

 		op, ok := optab[a[i]]
 		if !ok {
 			panic("missing optab entry for " + a[i])
 		}

 		y, y0 := val(a[i+1]), val(a[i+1])

 		got := doOp(x, op, y)
 		want := val(a[i+3])
 		if !eql(got, want) {
 			t.Errorf("%s: got %s; want %s", test, got, want)
 		}
 		if x0 != nil && !eql(x, x0) {
 			t.Errorf("%s: x changed to %s", test, x)
 		}
 		if !eql(y, y0) {
 			t.Errorf("%s: y changed to %s", test, y)
 		}
 	}
 }

 func eql(x, y Value) bool {
 	_, ux := x.(unknownVal)
 	_, uy := y.(unknownVal)
 	if ux || uy {
 		return ux == uy
 	}
 	return Compare(x, token.EQL, y)
 }

 // ----------------------------------------------------------------------------
 // Support functions

 func val(lit string) Value {
 	if len(lit) == 0 {
 		return MakeUnknown()
 	}

 	switch lit {
 	case "?":
 		return MakeUnknown()
 	case "true":
 		return MakeBool(true)
 	case "false":
 		return MakeBool(false)
 	}

 	tok := token.INT
 	switch first, last := lit[0], lit[len(lit)-1]; {
 	case first == '"' || first == '`':
 		tok = token.STRING
 		lit = strings.Replace(lit, "_", " ", -1)
 	case first == '\'':
 		tok = token.CHAR
 	case last == 'i':
 		tok = token.IMAG
 	default:
 		if !strings.HasPrefix(lit, "0x") && strings.ContainsAny(lit, "./Ee") {
 			tok = token.FLOAT
 		}
 	}

 	return MakeFromLiteral(lit, tok, 0)
 }

 var optab = map[string]token.Token{
 	"!": token.NOT,

 	"+": token.ADD,
 	"-": token.SUB,
 	"*": token.MUL,
 	"/": token.QUO,
 	"%": token.REM,

 	"<<": token.SHL,
 	">>": token.SHR,

 	"&":  token.AND,
 	"|":  token.OR,
 	"^":  token.XOR,
 	"&^": token.AND_NOT,

 	"==": token.EQL,
 	"!=": token.NEQ,
 	"<":  token.LSS,
 	"<=": token.LEQ,
 	">":  token.GTR,
 	">=": token.GEQ,
 }

 func panicHandler(v *Value) {
 	switch p := recover().(type) {
 	case nil:
 		// nothing to do
 	case string:
 		*v = MakeString(p)
 	case error:
 		*v = MakeString(p.Error())
 	default:
 		panic(p)
 	}
 }

 func doOp(x Value, op token.Token, y Value) (z Value) {
 	defer panicHandler(&z)

 	if x == nil {
 		return UnaryOp(op, y, 0)
 	}

 	switch op {
 	case token.EQL, token.NEQ, token.LSS, token.LEQ, token.GTR, token.GEQ:
 		return MakeBool(Compare(x, op, y))
 	case token.SHL, token.SHR:
 		s, _ := Int64Val(y)
 		return Shift(x, op, uint(s))
 	default:
 		return BinaryOp(x, op, y)
 	}
 }

 // ----------------------------------------------------------------------------
 // Other tests

 var fracTests = []string{
 	"0 0 1",
 	"1 1 1",
 	"-1 -1 1",
 	"1.2 6 5",
 	"-0.991 -991 1000",
 	"1e100 1e100 1",
 }

 func TestFractions(t *testing.T) {
 	for _, test := range fracTests {
 		a := strings.Split(test, " ")
 		if len(a) != 3 {
 			t.Errorf("invalid test case: %s", test)
 			continue
 		}

 		x := val(a[0])
 		n := val(a[1])
 		d := val(a[2])

 		if got := Num(x); !eql(got, n) {
 			t.Errorf("%s: got num = %s; want %s", test, got, n)
 		}

 		if got := Denom(x); !eql(got, d) {
 			t.Errorf("%s: got denom = %s; want %s", test, got, d)
 		}
 	}
 }

 var bytesTests = []string{
 	"0",
 	"1",
 	"123456789",
 	"123456789012345678901234567890123456789012345678901234567890",
 }

 func TestBytes(t *testing.T) {
 	for _, test := range bytesTests {
 		x := val(test)
 		bytes := Bytes(x)

 		// special case 0
 		if Sign(x) == 0 && len(bytes) != 0 {
 			t.Errorf("%s: got %v; want empty byte slice", test, bytes)
 		}

 		if n := len(bytes); n > 0 && bytes[n-1] == 0 {
 			t.Errorf("%s: got %v; want no leading 0 byte", test, bytes)
 		}

 		if got := MakeFromBytes(bytes); !eql(got, x) {
 			t.Errorf("%s: got %s; want %s (bytes = %v)", test, got, x, bytes)
 		}
 	}
 }

 func TestUnknown(t *testing.T) {
 	u := MakeUnknown()
 	var values = []Value{
 		u,
 		MakeBool(false), // token.ADD ok below, operation is never considered
 		MakeString(""),
 		MakeInt64(1),
 		MakeFromLiteral("-1234567890123456789012345678901234567890", token.INT, 0),
 		MakeFloat64(1.2),
 		MakeImag(MakeFloat64(1.2)),
 	}
 	for _, val := range values {
 		x, y := val, u
 		for i := range [2]int{} {
 			if i == 1 {
 				x, y = y, x
 			}
 			if got := BinaryOp(x, token.ADD, y); got.Kind() != Unknown {
 				t.Errorf("%s + %s: got %s; want %s", x, y, got, u)
 			}
 			if got := Compare(x, token.EQL, y); got {
 				t.Errorf("%s == %s: got true; want false", x, y)
 			}
 		}
 	}
 }
	// Copyright 2013 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	package constant

	import (
	"go/token"
	"strings"
	"testing"
	)

	// TODO(gri) expand this test framework

	var opTests = []string{
	// unary operations
	`+ 0 = 0`,
	`+ ? = ?`,
	`- 1 = -1`,
	`- ? = ?`,
	`^ 0 = -1`,
	`^ ? = ?`,

	`! true = false`,
	`! false = true`,
	`! ? = ?`,

	// etc.

	// binary operations
	`"" + "" = ""`,
	`"foo" + "" = "foo"`,
	`"" + "bar" = "bar"`,
	`"foo" + "bar" = "foobar"`,

	`0 + 0 = 0`,
	`0 + 0.1 = 0.1`,
	`0 + 0.1i = 0.1i`,
	`0.1 + 0.9 = 1`,
	`1e100 + 1e100 = 2e100`,
	`? + 0 = ?`,
	`0 + ? = ?`,

	`0 - 0 = 0`,
	`0 - 0.1 = -0.1`,
	`0 - 0.1i = -0.1i`,
	`1e100 - 1e100 = 0`,
	`? - 0 = ?`,
	`0 - ? = ?`,

	`0 * 0 = 0`,
	`1 * 0.1 = 0.1`,
	`1 * 0.1i = 0.1i`,
	`1i * 1i = -1`,
	`? * 0 = ?`,
	`0 * ? = ?`,

	`0 / 0 = "division_by_zero"`,
	`10 / 2 = 5`,
	`5 / 3 = 5/3`,
	`5i / 3i = 5/3`,
	`? / 0 = ?`,
	`0 / ? = ?`,

	`0 % 0 = "runtime_error:_integer_divide_by_zero"`, // TODO(gri) should be the same as for /
	`10 % 3 = 1`,
	`? % 0 = ?`,
	`0 % ? = ?`,

	`0 & 0 = 0`,
	`12345 & 0 = 0`,
	`0xff & 0xf = 0xf`,
	`? & 0 = ?`,
	`0 & ? = ?`,

	`0 \| 0 = 0`,
	`12345 \| 0 = 12345`,
	`0xb \| 0xa0 = 0xab`,
	`? \| 0 = ?`,
	`0 \| ? = ?`,

	`0 ^ 0 = 0`,
	`1 ^ -1 = -2`,
	`? ^ 0 = ?`,
	`0 ^ ? = ?`,

	`0 &^ 0 = 0`,
	`0xf &^ 1 = 0xe`,
	`1 &^ 0xf = 0`,
	// etc.

	// shifts
	`0 << 0 = 0`,
	`1 << 10 = 1024`,
	`0 >> 0 = 0`,
	`1024 >> 10 == 1`,
	`? << 0 == ?`,
	`? >> 10 == ?`,
	// etc.

	// comparisons
	`false == false = true`,
	`false == true = false`,
	`true == false = false`,
	`true == true = true`,

	`false != false = false`,
	`false != true = true`,
	`true != false = true`,
	`true != true = false`,

	`"foo" == "bar" = false`,
	`"foo" != "bar" = true`,
	`"foo" < "bar" = false`,
	`"foo" <= "bar" = false`,
	`"foo" > "bar" = true`,
	`"foo" >= "bar" = true`,

	`0 == 0 = true`,
	`0 != 0 = false`,
	`0 < 10 = true`,
	`10 <= 10 = true`,
	`0 > 10 = false`,
	`10 >= 10 = true`,

	`1/123456789 == 1/123456789 == true`,
	`1/123456789 != 1/123456789 == false`,
	`1/123456789 < 1/123456788 == true`,
	`1/123456788 <= 1/123456789 == false`,
	`0.11 > 0.11 = false`,
	`0.11 >= 0.11 = true`,

	`? == 0 = false`,
	`? != 0 = false`,
	`? < 10 = false`,
	`? <= 10 = false`,
	`? > 10 = false`,
	`? >= 10 = false`,

	`0 == ? = false`,
	`0 != ? = false`,
	`0 < ? = false`,
	`10 <= ? = false`,
	`0 > ? = false`,
	`10 >= ? = false`,

	// etc.
	}

	func TestOps(t *testing.T) {
	for _, test := range opTests {
	a := strings.Split(test, " ")
	i := 0 // operator index

	var x, x0 Value
	switch len(a) {
	case 4:
	// unary operation
	case 5:
	// binary operation
	x, x0 = val(a[0]), val(a[0])
	i = 1
	default:
	t.Errorf("invalid test case: %s", test)
	continue
	}

	op, ok := optab[a[i]]
	if !ok {
	panic("missing optab entry for " + a[i])
	}

	y, y0 := val(a[i+1]), val(a[i+1])

	got := doOp(x, op, y)
	want := val(a[i+3])
	if !eql(got, want) {
	t.Errorf("%s: got %s; want %s", test, got, want)
	}
	if x0 != nil && !eql(x, x0) {
	t.Errorf("%s: x changed to %s", test, x)
	}
	if !eql(y, y0) {
	t.Errorf("%s: y changed to %s", test, y)
	}
	}
	}

	func eql(x, y Value) bool {
	_, ux := x.(unknownVal)
	_, uy := y.(unknownVal)
	if ux \|\| uy {
	return ux == uy
	}
	return Compare(x, token.EQL, y)
	}

	// ----------------------------------------------------------------------------
	// Support functions

	func val(lit string) Value {
	if len(lit) == 0 {
	return MakeUnknown()
	}

	switch lit {
	case "?":
	return MakeUnknown()
	case "true":
	return MakeBool(true)
	case "false":
	return MakeBool(false)
	}

	tok := token.INT
	switch first, last := lit[0], lit[len(lit)-1]; {
	case first == '"' \|\| first == '`':
	tok = token.STRING
	lit = strings.Replace(lit, "_", " ", -1)
	case first == '\'':
	tok = token.CHAR
	case last == 'i':
	tok = token.IMAG
	default:
	if !strings.HasPrefix(lit, "0x") && strings.ContainsAny(lit, "./Ee") {
	tok = token.FLOAT
	}
	}

	return MakeFromLiteral(lit, tok, 0)
	}

	var optab = map[string]token.Token{
	"!": token.NOT,

	"+": token.ADD,
	"-": token.SUB,
	"*": token.MUL,
	"/": token.QUO,
	"%": token.REM,

	"<<": token.SHL,
	">>": token.SHR,

	"&": token.AND,
	"\|": token.OR,
	"^": token.XOR,
	"&^": token.AND_NOT,

	"==": token.EQL,
	"!=": token.NEQ,
	"<": token.LSS,
	"<=": token.LEQ,
	">": token.GTR,
	">=": token.GEQ,
	}

	func panicHandler(v *Value) {
	switch p := recover().(type) {
	case nil:
	// nothing to do
	case string:
	*v = MakeString(p)
	case error:
	*v = MakeString(p.Error())
	default:
	panic(p)
	}
	}

	func doOp(x Value, op token.Token, y Value) (z Value) {
	defer panicHandler(&z)

	if x == nil {
	return UnaryOp(op, y, 0)
	}

	switch op {
	case token.EQL, token.NEQ, token.LSS, token.LEQ, token.GTR, token.GEQ:
	return MakeBool(Compare(x, op, y))
	case token.SHL, token.SHR:
	s, _ := Int64Val(y)
	return Shift(x, op, uint(s))
	default:
	return BinaryOp(x, op, y)
	}
	}

	// ----------------------------------------------------------------------------
	// Other tests

	var fracTests = []string{
	"0 0 1",
	"1 1 1",
	"-1 -1 1",
	"1.2 6 5",
	"-0.991 -991 1000",
	"1e100 1e100 1",
	}

	func TestFractions(t *testing.T) {
	for _, test := range fracTests {
	a := strings.Split(test, " ")
	if len(a) != 3 {
	t.Errorf("invalid test case: %s", test)
	continue
	}

	x := val(a[0])
	n := val(a[1])
	d := val(a[2])

	if got := Num(x); !eql(got, n) {
	t.Errorf("%s: got num = %s; want %s", test, got, n)
	}

	if got := Denom(x); !eql(got, d) {
	t.Errorf("%s: got denom = %s; want %s", test, got, d)
	}
	}
	}

	var bytesTests = []string{
	"0",
	"1",
	"123456789",
	"123456789012345678901234567890123456789012345678901234567890",
	}

	func TestBytes(t *testing.T) {
	for _, test := range bytesTests {
	x := val(test)
	bytes := Bytes(x)

	// special case 0
	if Sign(x) == 0 && len(bytes) != 0 {
	t.Errorf("%s: got %v; want empty byte slice", test, bytes)
	}

	if n := len(bytes); n > 0 && bytes[n-1] == 0 {
	t.Errorf("%s: got %v; want no leading 0 byte", test, bytes)
	}

	if got := MakeFromBytes(bytes); !eql(got, x) {
	t.Errorf("%s: got %s; want %s (bytes = %v)", test, got, x, bytes)
	}
	}
	}

	func TestUnknown(t *testing.T) {
	u := MakeUnknown()
	var values = []Value{
	u,
	MakeBool(false), // token.ADD ok below, operation is never considered
	MakeString(""),
	MakeInt64(1),
	MakeFromLiteral("-1234567890123456789012345678901234567890", token.INT, 0),
	MakeFloat64(1.2),
	MakeImag(MakeFloat64(1.2)),
	}
	for _, val := range values {
	x, y := val, u
	for i := range [2]int{} {
	if i == 1 {
	x, y = y, x
	}
	if got := BinaryOp(x, token.ADD, y); got.Kind() != Unknown {
	t.Errorf("%s + %s: got %s; want %s", x, y, got, u)
	}
	if got := Compare(x, token.EQL, y); got {
	t.Errorf("%s == %s: got true; want false", x, y)
	}
	}
	}
	}