1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
22 "reflect/internal/example1"
23 "reflect/internal/example2"
35 const bucketCount = abi.MapBucketCount
39 func TestBool(t *testing.T) {
42 t.Fatal("ValueOf(true).Bool() = false")
54 var _ = T{} == T{} // tests depend on T being comparable
61 func assert(t *testing.T, s, want string) {
63 t.Errorf("have %#q want %#q", s, want)
67 var typeTests = []pair{
68 {struct{ x int }{}, "int"},
69 {struct{ x int8 }{}, "int8"},
70 {struct{ x int16 }{}, "int16"},
71 {struct{ x int32 }{}, "int32"},
72 {struct{ x int64 }{}, "int64"},
73 {struct{ x uint }{}, "uint"},
74 {struct{ x uint8 }{}, "uint8"},
75 {struct{ x uint16 }{}, "uint16"},
76 {struct{ x uint32 }{}, "uint32"},
77 {struct{ x uint64 }{}, "uint64"},
78 {struct{ x float32 }{}, "float32"},
79 {struct{ x float64 }{}, "float64"},
80 {struct{ x int8 }{}, "int8"},
81 {struct{ x (**int8) }{}, "**int8"},
82 {struct{ x (**integer) }{}, "**reflect_test.integer"},
83 {struct{ x ([32]int32) }{}, "[32]int32"},
84 {struct{ x ([]int8) }{}, "[]int8"},
85 {struct{ x (map[string]int32) }{}, "map[string]int32"},
86 {struct{ x (chan<- string) }{}, "chan<- string"},
87 {struct{ x (chan<- chan string) }{}, "chan<- chan string"},
88 {struct{ x (chan<- <-chan string) }{}, "chan<- <-chan string"},
89 {struct{ x (<-chan <-chan string) }{}, "<-chan <-chan string"},
90 {struct{ x (chan (<-chan string)) }{}, "chan (<-chan string)"},
97 "struct { c chan *int32; d float32 }",
99 {struct{ x (func(a int8, b int32)) }{}, "func(int8, int32)"},
102 c func(chan *integer, *int8)
105 "struct { c func(chan *reflect_test.integer, *int8) }",
113 "struct { a int8; b int32 }",
122 "struct { a int8; b int8; c int32 }",
132 "struct { a int8; b int8; c int8; d int32 }",
143 "struct { a int8; b int8; c int8; d int8; e int32 }",
155 "struct { a int8; b int8; c int8; d int8; e int8; f int32 }",
159 a int8 `reflect:"hi there"`
162 `struct { a int8 "reflect:\"hi there\"" }`,
166 a int8 `reflect:"hi \x00there\t\n\"\\"`
169 `struct { a int8 "reflect:\"hi \\x00there\\t\\n\\\"\\\\\"" }`,
176 "struct { f func(...int) }",
180 a(func(func(int) int) func(func(int)) int)
184 "interface { reflect_test.a(func(func(int) int) func(func(int)) int); reflect_test.b() }",
192 "struct { int32; int64 }",
196 var valueTests = []pair{
207 {new(float32), "256.25"},
208 {new(float64), "512.125"},
209 {new(complex64), "532.125+10i"},
210 {new(complex128), "564.25+1i"},
211 {new(string), "stringy cheese"},
213 {new(*int8), "*int8(0)"},
214 {new(**int8), "**int8(0)"},
215 {new([5]int32), "[5]int32{0, 0, 0, 0, 0}"},
216 {new(**integer), "**reflect_test.integer(0)"},
217 {new(map[string]int32), "map[string]int32{<can't iterate on maps>}"},
218 {new(chan<- string), "chan<- string"},
219 {new(func(a int8, b int32)), "func(int8, int32)(0)"},
224 "struct { c chan *int32; d float32 }{chan *int32, 0}",
226 {new(struct{ c func(chan *integer, *int8) }),
227 "struct { c func(chan *reflect_test.integer, *int8) }{func(chan *reflect_test.integer, *int8)(0)}",
233 "struct { a int8; b int32 }{0, 0}",
240 "struct { a int8; b int8; c int32 }{0, 0, 0}",
244 func testType(t *testing.T, i int, typ Type, want string) {
247 t.Errorf("#%d: have %#q, want %#q", i, s, want)
251 func TestTypes(t *testing.T) {
252 for i, tt := range typeTests {
253 testType(t, i, ValueOf(tt.i).Field(0).Type(), tt.s)
257 func TestSet(t *testing.T) {
258 for i, tt := range valueTests {
287 v.SetComplex(532.125 + 10i)
289 v.SetComplex(564.25 + 1i)
291 v.SetString("stringy cheese")
295 s := valueToString(v)
297 t.Errorf("#%d: have %#q, want %#q", i, s, tt.s)
302 func TestSetValue(t *testing.T) {
303 for i, tt := range valueTests {
304 v := ValueOf(tt.i).Elem()
307 v.Set(ValueOf(int(132)))
309 v.Set(ValueOf(int8(8)))
311 v.Set(ValueOf(int16(16)))
313 v.Set(ValueOf(int32(32)))
315 v.Set(ValueOf(int64(64)))
317 v.Set(ValueOf(uint(132)))
319 v.Set(ValueOf(uint8(8)))
321 v.Set(ValueOf(uint16(16)))
323 v.Set(ValueOf(uint32(32)))
325 v.Set(ValueOf(uint64(64)))
327 v.Set(ValueOf(float32(256.25)))
329 v.Set(ValueOf(512.125))
331 v.Set(ValueOf(complex64(532.125 + 10i)))
333 v.Set(ValueOf(complex128(564.25 + 1i)))
335 v.Set(ValueOf("stringy cheese"))
339 s := valueToString(v)
341 t.Errorf("#%d: have %#q, want %#q", i, s, tt.s)
346 func TestMapIterSet(t *testing.T) {
347 m := make(map[string]any, len(valueTests))
348 for _, tt := range valueTests {
353 k := New(v.Type().Key()).Elem()
354 e := New(v.Type().Elem()).Elem()
360 want := m[k.String()]
363 t.Errorf("%q: want (%T) %v, got (%T) %v", k.String(), want, want, got, got)
365 if setkey, key := valueToString(k), valueToString(iter.Key()); setkey != key {
366 t.Errorf("MapIter.Key() = %q, MapIter.SetKey() = %q", key, setkey)
368 if setval, val := valueToString(e), valueToString(iter.Value()); setval != val {
369 t.Errorf("MapIter.Value() = %q, MapIter.SetValue() = %q", val, setval)
373 if testenv.OptimizationOff() {
374 return // no inlining with the noopt builder
377 got := int(testing.AllocsPerRun(10, func() {
384 // Calling MapRange should not allocate even though it returns a *MapIter.
385 // The function is inlineable, so if the local usage does not escape
386 // the *MapIter, it can remain stack allocated.
389 t.Errorf("wanted %d alloc, got %d", want, got)
393 func TestCanIntUintFloatComplex(t *testing.T) {
397 type complex complex128
399 var ops = [...]string{"CanInt", "CanUint", "CanFloat", "CanComplex"}
401 var testCases = []struct {
406 {132, [...]bool{true, false, false, false}},
407 {int8(8), [...]bool{true, false, false, false}},
408 {int16(16), [...]bool{true, false, false, false}},
409 {int32(32), [...]bool{true, false, false, false}},
410 {int64(64), [...]bool{true, false, false, false}},
412 {uint(132), [...]bool{false, true, false, false}},
413 {uint8(8), [...]bool{false, true, false, false}},
414 {uint16(16), [...]bool{false, true, false, false}},
415 {uint32(32), [...]bool{false, true, false, false}},
416 {uint64(64), [...]bool{false, true, false, false}},
417 {uintptr(0xABCD), [...]bool{false, true, false, false}},
419 {float32(256.25), [...]bool{false, false, true, false}},
420 {float64(512.125), [...]bool{false, false, true, false}},
422 {complex64(532.125 + 10i), [...]bool{false, false, false, true}},
423 {complex128(564.25 + 1i), [...]bool{false, false, false, true}},
425 {integer(-132), [...]bool{true, false, false, false}},
426 {uinteger(132), [...]bool{false, true, false, false}},
427 {float(256.25), [...]bool{false, false, true, false}},
428 {complex(532.125 + 10i), [...]bool{false, false, false, true}},
430 {"hello world", [...]bool{false, false, false, false}},
431 {new(int), [...]bool{false, false, false, false}},
432 {new(uint), [...]bool{false, false, false, false}},
433 {new(float64), [...]bool{false, false, false, false}},
434 {new(complex64), [...]bool{false, false, false, false}},
435 {new([5]int), [...]bool{false, false, false, false}},
436 {new(integer), [...]bool{false, false, false, false}},
437 {new(map[int]int), [...]bool{false, false, false, false}},
438 {new(chan<- int), [...]bool{false, false, false, false}},
439 {new(func(a int8)), [...]bool{false, false, false, false}},
440 {new(struct{ i int }), [...]bool{false, false, false, false}},
443 for i, tc := range testCases {
445 got := [...]bool{v.CanInt(), v.CanUint(), v.CanFloat(), v.CanComplex()}
447 for j := range tc.want {
448 if got[j] != tc.want[j] {
450 "#%d: v.%s() returned %t for type %T, want %t",
462 func TestCanSetField(t *testing.T) {
463 type embed struct{ x, X int }
464 type Embed struct{ x, X int }
482 type testCase struct {
483 // -1 means Addr().Elem() of current value
494 {[]int{0, -1}, false},
495 {[]int{0, 0}, false},
496 {[]int{0, 0, -1}, false},
497 {[]int{0, -1, 0}, false},
498 {[]int{0, -1, 0, -1}, false},
500 {[]int{0, 1, -1}, true},
501 {[]int{0, -1, 1}, true},
502 {[]int{0, -1, 1, -1}, true},
504 {[]int{1, -1}, false},
506 {[]int{2, -1}, true},
509 val: ValueOf(&S2{embed: &embed{}}),
512 {[]int{0, -1}, false},
513 {[]int{0, 0}, false},
514 {[]int{0, 0, -1}, false},
515 {[]int{0, -1, 0}, false},
516 {[]int{0, -1, 0, -1}, false},
518 {[]int{0, 1, -1}, true},
519 {[]int{0, -1, 1}, true},
520 {[]int{0, -1, 1, -1}, true},
528 {[]int{0, -1}, true},
529 {[]int{0, 0}, false},
530 {[]int{0, 0, -1}, false},
531 {[]int{0, -1, 0}, false},
532 {[]int{0, -1, 0, -1}, false},
534 {[]int{0, 1, -1}, true},
535 {[]int{0, -1, 1}, true},
536 {[]int{0, -1, 1, -1}, true},
541 val: ValueOf(&S4{Embed: &Embed{}}),
544 {[]int{0, -1}, true},
545 {[]int{0, 0}, false},
546 {[]int{0, 0, -1}, false},
547 {[]int{0, -1, 0}, false},
548 {[]int{0, -1, 0, -1}, false},
550 {[]int{0, 1, -1}, true},
551 {[]int{0, -1, 1}, true},
552 {[]int{0, -1, 1, -1}, true},
558 for _, tt := range tests {
559 t.Run(tt.val.Type().Name(), func(t *testing.T) {
560 for _, tc := range tt.cases {
562 for _, i := range tc.index {
563 if f.Kind() == Pointer {
572 if got := f.CanSet(); got != tc.canSet {
573 t.Errorf("CanSet() = %v, want %v", got, tc.canSet)
582 var valueToStringTests = []pair{
587 {T{123, 456.75, "hello", &_i}, "reflect_test.T{123, 456.75, hello, *int(&7)}"},
588 {new(chan *T), "*chan *reflect_test.T(&chan *reflect_test.T)"},
589 {[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"},
590 {&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[10]int(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"},
591 {[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"},
592 {&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[]int(&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"},
595 func TestValueToString(t *testing.T) {
596 for i, test := range valueToStringTests {
597 s := valueToString(ValueOf(test.i))
599 t.Errorf("#%d: have %#q, want %#q", i, s, test.s)
604 func TestArrayElemSet(t *testing.T) {
605 v := ValueOf(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}).Elem()
606 v.Index(4).SetInt(123)
607 s := valueToString(v)
608 const want = "[10]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}"
610 t.Errorf("[10]int: have %#q want %#q", s, want)
613 v = ValueOf([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
614 v.Index(4).SetInt(123)
616 const want1 = "[]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}"
618 t.Errorf("[]int: have %#q want %#q", s, want1)
622 func TestPtrPointTo(t *testing.T) {
626 vi := ValueOf(&i).Elem()
627 vip.Elem().Set(vi.Addr())
629 t.Errorf("got %d, want 1234", *ip)
633 vp := ValueOf(&ip).Elem()
634 vp.Set(Zero(vp.Type()))
636 t.Errorf("got non-nil (%p), want nil", ip)
640 func TestPtrSetNil(t *testing.T) {
644 vip.Elem().Set(Zero(vip.Elem().Type()))
646 t.Errorf("got non-nil (%d), want nil", *ip)
650 func TestMapSetNil(t *testing.T) {
651 m := make(map[string]int)
653 vm.Elem().Set(Zero(vm.Elem().Type()))
655 t.Errorf("got non-nil (%p), want nil", m)
659 func TestAll(t *testing.T) {
660 testType(t, 1, TypeOf((int8)(0)), "int8")
661 testType(t, 2, TypeOf((*int8)(nil)).Elem(), "int8")
663 typ := TypeOf((*struct {
667 testType(t, 3, typ, "*struct { c chan *int32; d float32 }")
669 testType(t, 4, etyp, "struct { c chan *int32; d float32 }")
672 testType(t, 5, f.Type, "chan *int32")
674 f, present := styp.FieldByName("d")
676 t.Errorf("FieldByName says present field is absent")
678 testType(t, 6, f.Type, "float32")
680 f, present = styp.FieldByName("absent")
682 t.Errorf("FieldByName says absent field is present")
685 typ = TypeOf([32]int32{})
686 testType(t, 7, typ, "[32]int32")
687 testType(t, 8, typ.Elem(), "int32")
689 typ = TypeOf((map[string]*int32)(nil))
690 testType(t, 9, typ, "map[string]*int32")
692 testType(t, 10, mtyp.Key(), "string")
693 testType(t, 11, mtyp.Elem(), "*int32")
695 typ = TypeOf((chan<- string)(nil))
696 testType(t, 12, typ, "chan<- string")
697 testType(t, 13, typ.Elem(), "string")
699 // make sure tag strings are not part of element type
700 typ = TypeOf(struct {
701 d []uint32 `reflect:"TAG"`
703 testType(t, 14, typ, "[]uint32")
706 func TestInterfaceGet(t *testing.T) {
711 v1 := ValueOf(&inter)
712 v2 := v1.Elem().Field(0)
713 assert(t, v2.Type().String(), "interface {}")
716 assert(t, v3.Type().String(), "float64")
719 func TestInterfaceValue(t *testing.T) {
724 v1 := ValueOf(&inter)
725 v2 := v1.Elem().Field(0)
726 assert(t, v2.Type().String(), "interface {}")
728 assert(t, v3.Type().String(), "float64")
731 if _, ok := i3.(float64); !ok {
732 t.Error("v2.Interface() did not return float64, got ", TypeOf(i3))
736 func TestFunctionValue(t *testing.T) {
737 var x any = func() {}
739 if fmt.Sprint(v.Interface()) != fmt.Sprint(x) {
740 t.Fatalf("TestFunction returned wrong pointer")
742 assert(t, v.Type().String(), "func()")
745 func TestGrow(t *testing.T) {
746 v := ValueOf([]int(nil))
747 shouldPanic("reflect.Value.Grow using unaddressable value", func() { v.Grow(0) })
748 v = ValueOf(new([]int)).Elem()
751 t.Errorf("v.Grow(0) should still be nil")
755 t.Errorf("v.Cap = %v, want non-zero", v.Cap())
757 want := v.UnsafePointer()
759 got := v.UnsafePointer()
761 t.Errorf("noop v.Grow should not change pointers")
764 t.Run("Append", func(t *testing.T) {
766 v := ValueOf(&got).Elem()
767 appendValue := func(vt T) {
769 v.SetLen(v.Len() + 1)
770 v.Index(v.Len() - 1).Set(ValueOf(vt))
772 for i := 0; i < 10; i++ {
773 vt := T{i, float64(i), strconv.Itoa(i), &i}
775 want = append(want, vt)
777 if !DeepEqual(got, want) {
778 t.Errorf("value mismatch:\ngot %v\nwant %v", got, want)
782 t.Run("Rate", func(t *testing.T) {
784 v := ValueOf(new([]byte)).Elem()
785 for i := 0; i < 10; i++ {
786 b = append(b[:cap(b)], make([]byte, 1)...)
789 if v.Cap() != cap(b) {
790 t.Errorf("v.Cap = %v, want %v", v.Cap(), cap(b))
795 t.Run("ZeroCapacity", func(t *testing.T) {
796 for i := 0; i < 10; i++ {
797 v := ValueOf(new([]byte)).Elem()
801 for i, c := range b {
803 t.Fatalf("Value.Bytes[%d] = 0x%02x, want 0x00", i, c)
812 var appendTests = []struct {
820 {[]int{}, []int{22}},
821 {make([]int, 2, 4), nil},
822 {make([]int, 2, 4), []int{}},
823 {make([]int, 2, 4), []int{22}},
824 {make([]int, 2, 4), []int{22, 33, 44}},
827 func TestAppend(t *testing.T) {
828 for i, test := range appendTests {
829 origLen, extraLen := len(test.orig), len(test.extra)
830 want := append(test.orig, test.extra...)
831 // Convert extra from []int to []Value.
832 e0 := make([]Value, len(test.extra))
833 for j, e := range test.extra {
836 // Convert extra from []int to *SliceValue.
837 e1 := ValueOf(test.extra)
840 a0 := ValueOf(&test.orig).Elem()
841 have0 := Append(a0, e0...)
843 t.Errorf("Append #%d: have slice should not be addressable", i)
845 if !DeepEqual(have0.Interface(), want) {
846 t.Errorf("Append #%d: have %v, want %v (%p %p)", i, have0, want, test.orig, have0.Interface())
848 // Check that the orig and extra slices were not modified.
849 if a0.Len() != len(test.orig) {
850 t.Errorf("Append #%d: a0.Len: have %d, want %d", i, a0.Len(), origLen)
852 if len(test.orig) != origLen {
853 t.Errorf("Append #%d origLen: have %v, want %v", i, len(test.orig), origLen)
855 if len(test.extra) != extraLen {
856 t.Errorf("Append #%d extraLen: have %v, want %v", i, len(test.extra), extraLen)
860 a1 := ValueOf(&test.orig).Elem()
861 have1 := AppendSlice(a1, e1)
863 t.Errorf("AppendSlice #%d: have slice should not be addressable", i)
865 if !DeepEqual(have1.Interface(), want) {
866 t.Errorf("AppendSlice #%d: have %v, want %v", i, have1, want)
868 // Check that the orig and extra slices were not modified.
869 if a1.Len() != len(test.orig) {
870 t.Errorf("AppendSlice #%d: a1.Len: have %d, want %d", i, a0.Len(), origLen)
872 if len(test.orig) != origLen {
873 t.Errorf("AppendSlice #%d origLen: have %v, want %v", i, len(test.orig), origLen)
875 if len(test.extra) != extraLen {
876 t.Errorf("AppendSlice #%d extraLen: have %v, want %v", i, len(test.extra), extraLen)
879 // Test Append and AppendSlice with unexported value.
880 ax := ValueOf(struct{ x []int }{test.orig}).Field(0)
881 shouldPanic("using unexported field", func() { Append(ax, e0...) })
882 shouldPanic("using unexported field", func() { AppendSlice(ax, e1) })
886 func TestCopy(t *testing.T) {
887 a := []int{1, 2, 3, 4, 10, 9, 8, 7}
888 b := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
889 c := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
890 for i := 0; i < len(b); i++ {
892 t.Fatalf("b != c before test")
897 aa := ValueOf(&a1).Elem()
898 ab := ValueOf(&b1).Elem()
899 for tocopy := 1; tocopy <= 7; tocopy++ {
903 for i := 0; i < tocopy; i++ {
905 t.Errorf("(i) tocopy=%d a[%d]=%d, b[%d]=%d",
906 tocopy, i, a[i], i, b[i])
909 for i := tocopy; i < len(b); i++ {
912 t.Errorf("(ii) tocopy=%d a[%d]=%d, b[%d]=%d, c[%d]=%d",
913 tocopy, i, a[i], i, b[i], i, c[i])
915 t.Errorf("(iii) tocopy=%d b[%d]=%d, c[%d]=%d",
916 tocopy, i, b[i], i, c[i])
919 t.Logf("tocopy=%d elem %d is okay\n", tocopy, i)
925 func TestCopyString(t *testing.T) {
926 t.Run("Slice", func(t *testing.T) {
927 s := bytes.Repeat([]byte{'_'}, 8)
930 n := Copy(val, ValueOf(""))
931 if expecting := []byte("________"); n != 0 || !bytes.Equal(s, expecting) {
932 t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s, expecting)
935 n = Copy(val, ValueOf("hello"))
936 if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s, expecting) {
937 t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s, expecting)
940 n = Copy(val, ValueOf("helloworld"))
941 if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s, expecting) {
942 t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s, expecting)
945 t.Run("Array", func(t *testing.T) {
946 s := [...]byte{'_', '_', '_', '_', '_', '_', '_', '_'}
947 val := ValueOf(&s).Elem()
949 n := Copy(val, ValueOf(""))
950 if expecting := []byte("________"); n != 0 || !bytes.Equal(s[:], expecting) {
951 t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s[:], expecting)
954 n = Copy(val, ValueOf("hello"))
955 if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s[:], expecting) {
956 t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s[:], expecting)
959 n = Copy(val, ValueOf("helloworld"))
960 if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s[:], expecting) {
961 t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s[:], expecting)
966 func TestCopyArray(t *testing.T) {
967 a := [8]int{1, 2, 3, 4, 10, 9, 8, 7}
968 b := [11]int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
970 aa := ValueOf(&a).Elem()
971 ab := ValueOf(&b).Elem()
973 for i := 0; i < len(a); i++ {
975 t.Errorf("(i) a[%d]=%d, b[%d]=%d", i, a[i], i, b[i])
978 for i := len(a); i < len(b); i++ {
980 t.Errorf("(ii) b[%d]=%d, c[%d]=%d", i, b[i], i, c[i])
982 t.Logf("elem %d is okay\n", i)
987 func TestBigUnnamedStruct(t *testing.T) {
988 b := struct{ a, b, c, d int64 }{1, 2, 3, 4}
990 b1 := v.Interface().(struct {
993 if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d {
994 t.Errorf("ValueOf(%v).Interface().(*Big) = %v", b, b1)
1002 func TestBigStruct(t *testing.T) {
1003 b := big{1, 2, 3, 4, 5}
1005 b1 := v.Interface().(big)
1006 if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d || b1.e != b.e {
1007 t.Errorf("ValueOf(%v).Interface().(big) = %v", b, b1)
1018 type DeepEqualTest struct {
1023 // Simple functions for DeepEqual tests.
1027 fn3 = func() { fn1() } // Not nil.
1035 var loop1, loop2 Loop
1036 var loopy1, loopy2 Loopy
1037 var cycleMap1, cycleMap2, cycleMap3 map[string]any
1039 type structWithSelfPtr struct {
1040 p *structWithSelfPtr
1051 cycleMap1 = map[string]any{}
1052 cycleMap1["cycle"] = cycleMap1
1053 cycleMap2 = map[string]any{}
1054 cycleMap2["cycle"] = cycleMap2
1055 cycleMap3 = map[string]any{}
1056 cycleMap3["different"] = cycleMap3
1059 var deepEqualTests = []DeepEqualTest{
1063 {int32(1), int32(1), true},
1065 {float32(0.5), float32(0.5), true},
1066 {"hello", "hello", true},
1067 {make([]int, 10), make([]int, 10), true},
1068 {&[3]int{1, 2, 3}, &[3]int{1, 2, 3}, true},
1069 {Basic{1, 0.5}, Basic{1, 0.5}, true},
1070 {error(nil), error(nil), true},
1071 {map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, true},
1073 {[]byte{1, 2, 3}, []byte{1, 2, 3}, true},
1074 {[]MyByte{1, 2, 3}, []MyByte{1, 2, 3}, true},
1075 {MyBytes{1, 2, 3}, MyBytes{1, 2, 3}, true},
1079 {int32(1), int32(2), false},
1081 {float32(0.5), float32(0.6), false},
1082 {"hello", "hey", false},
1083 {make([]int, 10), make([]int, 11), false},
1084 {&[3]int{1, 2, 3}, &[3]int{1, 2, 4}, false},
1085 {Basic{1, 0.5}, Basic{1, 0.6}, false},
1086 {Basic{1, 0}, Basic{2, 0}, false},
1087 {map[int]string{1: "one", 3: "two"}, map[int]string{2: "two", 1: "one"}, false},
1088 {map[int]string{1: "one", 2: "txo"}, map[int]string{2: "two", 1: "one"}, false},
1089 {map[int]string{1: "one"}, map[int]string{2: "two", 1: "one"}, false},
1090 {map[int]string{2: "two", 1: "one"}, map[int]string{1: "one"}, false},
1095 {[][]int{{1}}, [][]int{{2}}, false},
1096 {&structWithSelfPtr{p: &structWithSelfPtr{s: "a"}}, &structWithSelfPtr{p: &structWithSelfPtr{s: "b"}}, false},
1098 // Fun with floating point.
1099 {math.NaN(), math.NaN(), false},
1100 {&[1]float64{math.NaN()}, &[1]float64{math.NaN()}, false},
1101 {&[1]float64{math.NaN()}, self{}, true},
1102 {[]float64{math.NaN()}, []float64{math.NaN()}, false},
1103 {[]float64{math.NaN()}, self{}, true},
1104 {map[float64]float64{math.NaN(): 1}, map[float64]float64{1: 2}, false},
1105 {map[float64]float64{math.NaN(): 1}, self{}, true},
1107 // Nil vs empty: not the same.
1108 {[]int{}, []int(nil), false},
1109 {[]int{}, []int{}, true},
1110 {[]int(nil), []int(nil), true},
1111 {map[int]int{}, map[int]int(nil), false},
1112 {map[int]int{}, map[int]int{}, true},
1113 {map[int]int(nil), map[int]int(nil), true},
1117 {int32(1), int64(1), false},
1118 {0.5, "hello", false},
1119 {[]int{1, 2, 3}, [3]int{1, 2, 3}, false},
1120 {&[3]any{1, 2, 4}, &[3]any{1, 2, "s"}, false},
1121 {Basic{1, 0.5}, NotBasic{1, 0.5}, false},
1122 {map[uint]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, false},
1123 {[]byte{1, 2, 3}, []MyByte{1, 2, 3}, false},
1124 {[]MyByte{1, 2, 3}, MyBytes{1, 2, 3}, false},
1125 {[]byte{1, 2, 3}, MyBytes{1, 2, 3}, false},
1128 {&loop1, &loop1, true},
1129 {&loop1, &loop2, true},
1130 {&loopy1, &loopy1, true},
1131 {&loopy1, &loopy2, true},
1132 {&cycleMap1, &cycleMap2, true},
1133 {&cycleMap1, &cycleMap3, false},
1136 func TestDeepEqual(t *testing.T) {
1137 for _, test := range deepEqualTests {
1138 if test.b == (self{}) {
1141 if r := DeepEqual(test.a, test.b); r != test.eq {
1142 t.Errorf("DeepEqual(%#v, %#v) = %v, want %v", test.a, test.b, r, test.eq)
1147 func TestTypeOf(t *testing.T) {
1148 // Special case for nil
1149 if typ := TypeOf(nil); typ != nil {
1150 t.Errorf("expected nil type for nil value; got %v", typ)
1152 for _, test := range deepEqualTests {
1153 v := ValueOf(test.a)
1157 typ := TypeOf(test.a)
1158 if typ != v.Type() {
1159 t.Errorf("TypeOf(%v) = %v, but ValueOf(%v).Type() = %v", test.a, typ, test.a, v.Type())
1164 type Recursive struct {
1169 func TestDeepEqualRecursiveStruct(t *testing.T) {
1170 a, b := new(Recursive), new(Recursive)
1171 *a = Recursive{12, a}
1172 *b = Recursive{12, b}
1173 if !DeepEqual(a, b) {
1174 t.Error("DeepEqual(recursive same) = false, want true")
1178 type _Complex struct {
1182 d map[float64]float64
1185 func TestDeepEqualComplexStruct(t *testing.T) {
1186 m := make(map[float64]float64)
1187 stra, strb := "hello", "hello"
1188 a, b := new(_Complex), new(_Complex)
1189 *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m}
1190 *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m}
1191 if !DeepEqual(a, b) {
1192 t.Error("DeepEqual(complex same) = false, want true")
1196 func TestDeepEqualComplexStructInequality(t *testing.T) {
1197 m := make(map[float64]float64)
1198 stra, strb := "hello", "helloo" // Difference is here
1199 a, b := new(_Complex), new(_Complex)
1200 *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m}
1201 *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m}
1202 if DeepEqual(a, b) {
1203 t.Error("DeepEqual(complex different) = true, want false")
1207 type UnexpT struct {
1211 func TestDeepEqualUnexportedMap(t *testing.T) {
1212 // Check that DeepEqual can look at unexported fields.
1213 x1 := UnexpT{map[int]int{1: 2}}
1214 x2 := UnexpT{map[int]int{1: 2}}
1215 if !DeepEqual(&x1, &x2) {
1216 t.Error("DeepEqual(x1, x2) = false, want true")
1219 y1 := UnexpT{map[int]int{2: 3}}
1220 if DeepEqual(&x1, &y1) {
1221 t.Error("DeepEqual(x1, y1) = true, want false")
1225 var deepEqualPerfTests = []struct {
1228 {x: int8(99), y: int8(99)},
1229 {x: []int8{99}, y: []int8{99}},
1230 {x: int16(99), y: int16(99)},
1231 {x: []int16{99}, y: []int16{99}},
1232 {x: int32(99), y: int32(99)},
1233 {x: []int32{99}, y: []int32{99}},
1234 {x: int64(99), y: int64(99)},
1235 {x: []int64{99}, y: []int64{99}},
1236 {x: int(999999), y: int(999999)},
1237 {x: []int{999999}, y: []int{999999}},
1239 {x: uint8(99), y: uint8(99)},
1240 {x: []uint8{99}, y: []uint8{99}},
1241 {x: uint16(99), y: uint16(99)},
1242 {x: []uint16{99}, y: []uint16{99}},
1243 {x: uint32(99), y: uint32(99)},
1244 {x: []uint32{99}, y: []uint32{99}},
1245 {x: uint64(99), y: uint64(99)},
1246 {x: []uint64{99}, y: []uint64{99}},
1247 {x: uint(999999), y: uint(999999)},
1248 {x: []uint{999999}, y: []uint{999999}},
1249 {x: uintptr(999999), y: uintptr(999999)},
1250 {x: []uintptr{999999}, y: []uintptr{999999}},
1252 {x: float32(1.414), y: float32(1.414)},
1253 {x: []float32{1.414}, y: []float32{1.414}},
1254 {x: float64(1.414), y: float64(1.414)},
1255 {x: []float64{1.414}, y: []float64{1.414}},
1257 {x: complex64(1.414), y: complex64(1.414)},
1258 {x: []complex64{1.414}, y: []complex64{1.414}},
1259 {x: complex128(1.414), y: complex128(1.414)},
1260 {x: []complex128{1.414}, y: []complex128{1.414}},
1263 {x: []bool{true}, y: []bool{true}},
1265 {x: "abcdef", y: "abcdef"},
1266 {x: []string{"abcdef"}, y: []string{"abcdef"}},
1268 {x: []byte("abcdef"), y: []byte("abcdef")},
1269 {x: [][]byte{[]byte("abcdef")}, y: [][]byte{[]byte("abcdef")}},
1271 {x: [6]byte{'a', 'b', 'c', 'a', 'b', 'c'}, y: [6]byte{'a', 'b', 'c', 'a', 'b', 'c'}},
1272 {x: [][6]byte{[6]byte{'a', 'b', 'c', 'a', 'b', 'c'}}, y: [][6]byte{[6]byte{'a', 'b', 'c', 'a', 'b', 'c'}}},
1275 func TestDeepEqualAllocs(t *testing.T) {
1276 for _, tt := range deepEqualPerfTests {
1277 t.Run(ValueOf(tt.x).Type().String(), func(t *testing.T) {
1278 got := testing.AllocsPerRun(100, func() {
1279 if !DeepEqual(tt.x, tt.y) {
1280 t.Errorf("DeepEqual(%v, %v)=false", tt.x, tt.y)
1284 t.Errorf("DeepEqual(%v, %v) allocated %d times", tt.x, tt.y, int(got))
1290 func check2ndField(x any, offs uintptr, t *testing.T) {
1292 f := s.Type().Field(1)
1293 if f.Offset != offs {
1294 t.Error("mismatched offsets in structure alignment:", f.Offset, offs)
1298 // Check that structure alignment & offsets viewed through reflect agree with those
1299 // from the compiler itself.
1300 func TestAlignment(t *testing.T) {
1301 type T1inner struct {
1308 type T2inner struct {
1316 x := T1{T1inner{2}, 17}
1317 check2ndField(x, uintptr(unsafe.Pointer(&x.f))-uintptr(unsafe.Pointer(&x)), t)
1319 x1 := T2{T2inner{2, 3}, 17}
1320 check2ndField(x1, uintptr(unsafe.Pointer(&x1.f))-uintptr(unsafe.Pointer(&x1)), t)
1323 func Nil(a any, t *testing.T) {
1324 n := ValueOf(a).Field(0)
1326 t.Errorf("%v should be nil", a)
1330 func NotNil(a any, t *testing.T) {
1331 n := ValueOf(a).Field(0)
1333 t.Errorf("value of type %v should not be nil", ValueOf(a).Type().String())
1337 func TestIsNil(t *testing.T) {
1338 // These implement IsNil.
1339 // Wrap in extra struct to hide interface type.
1343 struct{ x map[string]int }{},
1344 struct{ x func() bool }{},
1345 struct{ x chan int }{},
1346 struct{ x []string }{},
1347 struct{ x unsafe.Pointer }{},
1349 for _, ts := range doNil {
1350 ty := TypeOf(ts).Field(0).Type
1352 v.IsNil() // panics if not okay to call
1355 // Check the implementations
1367 si.x = make([]int, 10)
1374 ci.x = make(chan int)
1381 mi.x = make(map[int]int)
1392 x func(t *testing.T)
1399 func setField[S, V any](in S, offset uintptr, value V) (out S) {
1400 *(*V)(unsafe.Add(unsafe.Pointer(&in), offset)) = value
1404 func TestIsZero(t *testing.T) {
1405 for i, tt := range []struct {
1434 {float32(1.2), false},
1436 {float64(1.2), false},
1437 {math.Copysign(0, -1), true},
1438 {complex64(0), true},
1439 {complex64(1.2), false},
1440 {complex128(0), true},
1441 {complex128(1.2), false},
1442 {complex(math.Copysign(0, -1), 0), true},
1443 {complex(0, math.Copysign(0, -1)), true},
1444 {complex(math.Copysign(0, -1), math.Copysign(0, -1)), true},
1446 {uintptr(128), false},
1448 {Zero(TypeOf([5]string{})).Interface(), true},
1449 {[5]string{}, true}, // comparable array
1450 {[5]string{"", "", "", "a", ""}, false}, // comparable array
1451 {[1]*int{}, true}, // direct pointer array
1452 {[1]*int{new(int)}, false}, // direct pointer array
1453 {[3][]int{}, true}, // incomparable array
1454 {[3][]int{{1}}, false}, // incomparable array
1455 {[1 << 12]byte{}, true},
1456 {[1 << 12]byte{1}, false},
1458 {[3]Value{{}, ValueOf(0), {}}, false},
1460 {(chan string)(nil), true},
1461 {make(chan string), false},
1462 {time.After(1), false},
1464 {(func())(nil), true},
1467 {New(TypeOf(new(error)).Elem()).Elem(), true},
1468 {(io.Reader)(strings.NewReader("")), false},
1470 {(map[string]string)(nil), true},
1471 {map[string]string{}, false},
1472 {make(map[string]string), false},
1474 {(*func())(nil), true},
1475 {(*int)(nil), true},
1478 {[]string{}, false},
1479 {([]string)(nil), true},
1480 {make([]string, 0), false},
1483 {"not-zero", false},
1485 {T{}, true}, // comparable struct
1486 {T{123, 456.75, "hello", &_i}, false}, // comparable struct
1487 {struct{ p *int }{}, true}, // direct pointer struct
1488 {struct{ p *int }{new(int)}, false}, // direct pointer struct
1489 {struct{ s []int }{}, true}, // incomparable struct
1490 {struct{ s []int }{[]int{1}}, false}, // incomparable struct
1491 {struct{ Value }{}, true},
1492 {struct{ Value }{ValueOf(0)}, false},
1493 {struct{ _, a, _ uintptr }{}, true}, // comparable struct with blank fields
1494 {setField(struct{ _, a, _ uintptr }{}, 0*unsafe.Sizeof(uintptr(0)), 1), true},
1495 {setField(struct{ _, a, _ uintptr }{}, 1*unsafe.Sizeof(uintptr(0)), 1), false},
1496 {setField(struct{ _, a, _ uintptr }{}, 2*unsafe.Sizeof(uintptr(0)), 1), true},
1497 {struct{ _, a, _ func() }{}, true}, // incomparable struct with blank fields
1498 {setField(struct{ _, a, _ func() }{}, 0*unsafe.Sizeof((func())(nil)), func() {}), true},
1499 {setField(struct{ _, a, _ func() }{}, 1*unsafe.Sizeof((func())(nil)), func() {}), false},
1500 {setField(struct{ _, a, _ func() }{}, 2*unsafe.Sizeof((func())(nil)), func() {}), true},
1502 {(unsafe.Pointer)(nil), true},
1503 {(unsafe.Pointer)(new(int)), false},
1506 if v, ok := tt.x.(Value); ok {
1514 t.Errorf("%d: IsZero((%s)(%+v)) = %t, want %t", i, x.Kind(), tt.x, b, tt.want)
1517 if !Zero(TypeOf(tt.x)).IsZero() {
1518 t.Errorf("%d: IsZero(Zero(TypeOf((%s)(%+v)))) is false", i, x.Kind(), tt.x)
1521 p := New(x.Type()).Elem()
1525 t.Errorf("%d: IsZero((%s)(%+v)) is true after SetZero", i, p.Kind(), tt.x)
1531 if r := recover(); r == nil {
1532 t.Error("should panic for invalid value")
1539 func TestInterfaceExtraction(t *testing.T) {
1545 v := Indirect(ValueOf(&s)).Field(0).Interface()
1547 t.Error("Interface() on interface: ", v, s.W)
1551 func TestNilPtrValueSub(t *testing.T) {
1553 if pv := ValueOf(pi); pv.Elem().IsValid() {
1554 t.Error("ValueOf((*int)(nil)).Elem().IsValid()")
1558 func TestMap(t *testing.T) {
1559 m := map[string]int{"a": 1, "b": 2}
1561 if n := mv.Len(); n != len(m) {
1562 t.Errorf("Len = %d, want %d", n, len(m))
1564 keys := mv.MapKeys()
1565 newmap := MakeMap(mv.Type())
1566 for k, v := range m {
1567 // Check that returned Keys match keys in range.
1568 // These aren't required to be in the same order.
1570 for _, kv := range keys {
1571 if kv.String() == k {
1577 t.Errorf("Missing key %q", k)
1580 // Check that value lookup is correct.
1581 vv := mv.MapIndex(ValueOf(k))
1582 if vi := vv.Int(); vi != int64(v) {
1583 t.Errorf("Key %q: have value %d, want %d", k, vi, v)
1586 // Copy into new map.
1587 newmap.SetMapIndex(ValueOf(k), ValueOf(v))
1589 vv := mv.MapIndex(ValueOf("not-present"))
1591 t.Errorf("Invalid key: got non-nil value %s", valueToString(vv))
1594 newm := newmap.Interface().(map[string]int)
1595 if len(newm) != len(m) {
1596 t.Errorf("length after copy: newm=%d, m=%d", len(newm), len(m))
1599 for k, v := range newm {
1602 t.Errorf("newm[%q] = %d, but m[%q] = %d, %v", k, v, k, mv, ok)
1606 newmap.SetMapIndex(ValueOf("a"), Value{})
1609 t.Errorf("newm[\"a\"] = %d after delete", v)
1612 mv = ValueOf(&m).Elem()
1613 mv.Set(Zero(mv.Type()))
1615 t.Errorf("mv.Set(nil) failed")
1619 shouldPanic("not assignable", func() { mv.MapIndex(ValueOf(S("key"))) })
1620 shouldPanic("not assignable", func() { mv.SetMapIndex(ValueOf(S("key")), ValueOf(0)) })
1623 func TestNilMap(t *testing.T) {
1624 var m map[string]int
1626 keys := mv.MapKeys()
1628 t.Errorf(">0 keys for nil map: %v", keys)
1631 // Check that value for missing key is zero.
1632 x := mv.MapIndex(ValueOf("hello"))
1633 if x.Kind() != Invalid {
1634 t.Errorf("m.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x)
1637 // Check big value too.
1638 var mbig map[string][10 << 20]byte
1639 x = ValueOf(mbig).MapIndex(ValueOf("hello"))
1640 if x.Kind() != Invalid {
1641 t.Errorf("mbig.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x)
1644 // Test that deletes from a nil map succeed.
1645 mv.SetMapIndex(ValueOf("hi"), Value{})
1648 func TestChan(t *testing.T) {
1649 for loop := 0; loop < 2; loop++ {
1653 // check both ways to allocate channels
1656 c = make(chan int, 1)
1659 cv = MakeChan(TypeOf(c), 1)
1660 c = cv.Interface().(chan int)
1665 if i := <-c; i != 2 {
1666 t.Errorf("reflect Send 2, native recv %d", i)
1671 if i, ok := cv.Recv(); i.Int() != 3 || !ok {
1672 t.Errorf("native send 3, reflect Recv %d, %t", i.Int(), ok)
1676 val, ok := cv.TryRecv()
1677 if val.IsValid() || ok {
1678 t.Errorf("TryRecv on empty chan: %s, %t", valueToString(val), ok)
1683 val, ok = cv.TryRecv()
1685 t.Errorf("TryRecv on ready chan got nil")
1686 } else if i := val.Int(); i != 4 || !ok {
1687 t.Errorf("native send 4, TryRecv %d, %t", i, ok)
1692 ok = cv.TrySend(ValueOf(5))
1695 t.Errorf("TrySend on full chan succeeded: value %d", i)
1699 ok = cv.TrySend(ValueOf(6))
1701 t.Errorf("TrySend on empty chan failed")
1704 t.Errorf("TrySend failed but it did send %d", x)
1708 if i = <-c; i != 6 {
1709 t.Errorf("TrySend 6, recv %d", i)
1716 if i, ok := cv.Recv(); i.Int() != 123 || !ok {
1717 t.Errorf("send 123 then close; Recv %d, %t", i.Int(), ok)
1719 if i, ok := cv.Recv(); i.Int() != 0 || ok {
1720 t.Errorf("after close Recv %d, %t", i.Int(), ok)
1722 // Closing a read-only channel
1723 shouldPanic("", func() {
1724 c := make(<-chan int, 1)
1730 // check creation of unbuffered channel
1732 cv := MakeChan(TypeOf(c), 0)
1733 c = cv.Interface().(chan int)
1734 if cv.TrySend(ValueOf(7)) {
1735 t.Errorf("TrySend on sync chan succeeded")
1737 if v, ok := cv.TryRecv(); v.IsValid() || ok {
1738 t.Errorf("TryRecv on sync chan succeeded: isvalid=%v ok=%v", v.IsValid(), ok)
1742 cv = MakeChan(TypeOf(c), 10)
1743 c = cv.Interface().(chan int)
1744 for i := 0; i < 3; i++ {
1747 if l, m := cv.Len(), cv.Cap(); l != len(c) || m != cap(c) {
1748 t.Errorf("Len/Cap = %d/%d want %d/%d", l, m, len(c), cap(c))
1752 // caseInfo describes a single case in a select test.
1753 type caseInfo struct {
1762 var allselect = flag.Bool("allselect", false, "exhaustive select test")
1764 func TestSelect(t *testing.T) {
1765 selectWatch.once.Do(func() { go selectWatcher() })
1769 newop := func(n int, cap int) (ch, val Value) {
1772 c := make(chan int, cap)
1776 c := make(chan string, cap)
1778 val = ValueOf(fmt.Sprint(n))
1783 for n := 0; x.Next(); n++ {
1784 if testing.Short() && n >= 1000 {
1787 if n >= 100000 && !*allselect {
1790 if n%100000 == 0 && testing.Verbose() {
1791 println("TestSelect", n)
1793 var cases []SelectCase
1798 ch, val := newop(len(cases), 1)
1799 cases = append(cases, SelectCase{
1804 info = append(info, caseInfo{desc: "ready send", canSelect: true})
1809 ch, val := newop(len(cases), 1)
1811 cases = append(cases, SelectCase{
1815 info = append(info, caseInfo{desc: "ready recv", canSelect: true, recv: val})
1820 ch, val := newop(len(cases), 0)
1821 cases = append(cases, SelectCase{
1828 f := func() { ch.Recv() }
1829 info = append(info, caseInfo{desc: "blocking send", helper: f})
1831 info = append(info, caseInfo{desc: "blocking send"})
1837 ch, val := newop(len(cases), 0)
1838 cases = append(cases, SelectCase{
1844 f := func() { ch.Send(val) }
1845 info = append(info, caseInfo{desc: "blocking recv", recv: val, helper: f})
1847 info = append(info, caseInfo{desc: "blocking recv"})
1853 // Maybe include value to send.
1858 cases = append(cases, SelectCase{
1862 info = append(info, caseInfo{desc: "zero Chan send"})
1865 // Zero Chan receive.
1867 cases = append(cases, SelectCase{
1870 info = append(info, caseInfo{desc: "zero Chan recv"})
1875 cases = append(cases, SelectCase{
1877 Chan: ValueOf((chan int)(nil)),
1880 info = append(info, caseInfo{desc: "nil Chan send"})
1885 cases = append(cases, SelectCase{
1887 Chan: ValueOf((chan int)(nil)),
1889 info = append(info, caseInfo{desc: "nil Chan recv"})
1892 // closed Chan send.
1894 ch := make(chan int)
1896 cases = append(cases, SelectCase{
1901 info = append(info, caseInfo{desc: "closed Chan send", canSelect: true, panic: true})
1904 // closed Chan recv.
1906 ch, val := newop(len(cases), 0)
1908 val = Zero(val.Type())
1909 cases = append(cases, SelectCase{
1913 info = append(info, caseInfo{desc: "closed Chan recv", canSelect: true, closed: true, recv: val})
1916 var helper func() // goroutine to help the select complete
1918 // Add default? Must be last case here, but will permute.
1919 // Add the default if the select would otherwise
1920 // block forever, and maybe add it anyway.
1926 for i, c := range info {
1934 } else if c.helper != nil {
1936 helpers = append(helpers, i)
1939 if !canProceed || x.Maybe() {
1940 cases = append(cases, SelectCase{
1943 info = append(info, caseInfo{desc: "default", canSelect: canBlock})
1945 } else if canBlock {
1946 // Select needs to communicate with another goroutine.
1947 cas := &info[helpers[x.Choose(len(helpers))]]
1949 cas.canSelect = true
1953 // Permute cases and case info.
1954 // Doing too much here makes the exhaustive loop
1955 // too exhausting, so just do two swaps.
1956 for loop := 0; loop < 2; loop++ {
1957 i := x.Choose(len(cases))
1958 j := x.Choose(len(cases))
1959 cases[i], cases[j] = cases[j], cases[i]
1960 info[i], info[j] = info[j], info[i]
1964 // We wait before kicking off a goroutine to satisfy a blocked select.
1965 // The pause needs to be big enough to let the select block before
1966 // we run the helper, but if we lose that race once in a while it's okay: the
1967 // select will just proceed immediately. Not a big deal.
1968 // For short tests we can grow [sic] the timeout a bit without fear of taking too long
1969 pause := 10 * time.Microsecond
1970 if testing.Short() {
1971 pause = 100 * time.Microsecond
1973 time.AfterFunc(pause, helper)
1977 i, recv, recvOK, panicErr := runSelect(cases, info)
1978 if panicErr != nil && !canPanic {
1979 t.Fatalf("%s\npanicked unexpectedly: %v", fmtSelect(info), panicErr)
1981 if panicErr == nil && canPanic && numCanSelect == 1 {
1982 t.Fatalf("%s\nselected #%d incorrectly (should panic)", fmtSelect(info), i)
1984 if panicErr != nil {
1992 recvStr = fmt.Sprintf(", received %v, %v", recv.Interface(), recvOK)
1994 t.Fatalf("%s\nselected #%d incorrectly%s", fmtSelect(info), i, recvStr)
1997 t.Fatalf("%s\nselected #%d incorrectly (case should panic)", fmtSelect(info), i)
2000 if cases[i].Dir == SelectRecv {
2001 if !recv.IsValid() {
2002 t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, cas.recv.Interface(), !cas.closed)
2004 if !cas.recv.IsValid() {
2005 t.Fatalf("%s\nselected #%d but internal error: missing recv value", fmtSelect(info), i)
2007 if recv.Interface() != cas.recv.Interface() || recvOK != !cas.closed {
2008 if recv.Interface() == cas.recv.Interface() && recvOK == !cas.closed {
2009 t.Fatalf("%s\nselected #%d, got %#v, %v, and DeepEqual is broken on %T", fmtSelect(info), i, recv.Interface(), recvOK, recv.Interface())
2011 t.Fatalf("%s\nselected #%d but got %#v, %v, want %#v, %v", fmtSelect(info), i, recv.Interface(), recvOK, cas.recv.Interface(), !cas.closed)
2014 if recv.IsValid() || recvOK {
2015 t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, Value{}, false)
2021 func TestSelectMaxCases(t *testing.T) {
2022 var sCases []SelectCase
2023 channel := make(chan int)
2025 for i := 0; i < 65536; i++ {
2026 sCases = append(sCases, SelectCase{
2028 Chan: ValueOf(channel),
2032 _, _, _ = Select(sCases)
2033 sCases = append(sCases, SelectCase{
2035 Chan: ValueOf(channel),
2038 if err := recover(); err != nil {
2039 if err.(string) != "reflect.Select: too many cases (max 65536)" {
2040 t.Fatalf("unexpected error from select call with greater than max supported cases")
2043 t.Fatalf("expected select call to panic with greater than max supported cases")
2047 _, _, _ = Select(sCases)
2050 func TestSelectNop(t *testing.T) {
2051 // "select { default: }" should always return the default case.
2052 chosen, _, _ := Select([]SelectCase{{Dir: SelectDefault}})
2054 t.Fatalf("expected Select to return 0, but got %#v", chosen)
2058 // selectWatch and the selectWatcher are a watchdog mechanism for running Select.
2059 // If the selectWatcher notices that the select has been blocked for >1 second, it prints
2060 // an error describing the select and panics the entire test binary.
2061 var selectWatch struct {
2068 func selectWatcher() {
2070 time.Sleep(1 * time.Second)
2072 if selectWatch.info != nil && time.Since(selectWatch.now) > 10*time.Second {
2073 fmt.Fprintf(os.Stderr, "TestSelect:\n%s blocked indefinitely\n", fmtSelect(selectWatch.info))
2074 panic("select stuck")
2076 selectWatch.Unlock()
2080 // runSelect runs a single select test.
2081 // It returns the values returned by Select but also returns
2082 // a panic value if the Select panics.
2083 func runSelect(cases []SelectCase, info []caseInfo) (chosen int, recv Value, recvOK bool, panicErr any) {
2085 panicErr = recover()
2088 selectWatch.info = nil
2089 selectWatch.Unlock()
2093 selectWatch.now = time.Now()
2094 selectWatch.info = info
2095 selectWatch.Unlock()
2097 chosen, recv, recvOK = Select(cases)
2101 // fmtSelect formats the information about a single select test.
2102 func fmtSelect(info []caseInfo) string {
2103 var buf strings.Builder
2104 fmt.Fprintf(&buf, "\nselect {\n")
2105 for i, cas := range info {
2106 fmt.Fprintf(&buf, "%d: %s", i, cas.desc)
2107 if cas.recv.IsValid() {
2108 fmt.Fprintf(&buf, " val=%#v", cas.recv.Interface())
2111 fmt.Fprintf(&buf, " canselect")
2114 fmt.Fprintf(&buf, " panic")
2116 fmt.Fprintf(&buf, "\n")
2118 fmt.Fprintf(&buf, "}")
2124 // Difficult test for function call because of
2125 // implicit padding between arguments.
2126 func dummy(b byte, c int, d byte, e two, f byte, g float32, h byte) (i byte, j int, k byte, l two, m byte, n float32, o byte) {
2127 return b, c, d, e, f, g, h
2130 func TestFunc(t *testing.T) {
2131 ret := ValueOf(dummy).Call([]Value{
2135 ValueOf(two{40, 50}),
2137 ValueOf(float32(70)),
2141 t.Fatalf("Call returned %d values, want 7", len(ret))
2144 i := byte(ret[0].Uint())
2145 j := int(ret[1].Int())
2146 k := byte(ret[2].Uint())
2147 l := ret[3].Interface().(two)
2148 m := byte(ret[4].Uint())
2149 n := float32(ret[5].Float())
2150 o := byte(ret[6].Uint())
2152 if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 {
2153 t.Errorf("Call returned %d, %d, %d, %v, %d, %g, %d; want 10, 20, 30, [40, 50], 60, 70, 80", i, j, k, l, m, n, o)
2156 for i, v := range ret {
2158 t.Errorf("result %d is addressable", i)
2163 func TestCallConvert(t *testing.T) {
2164 v := ValueOf(new(io.ReadWriter)).Elem()
2165 f := ValueOf(func(r io.Reader) io.Reader { return r })
2166 out := f.Call([]Value{v})
2167 if len(out) != 1 || out[0].Type() != TypeOf(new(io.Reader)).Elem() || !out[0].IsNil() {
2168 t.Errorf("expected [nil], got %v", out)
2172 type emptyStruct struct{}
2174 type nonEmptyStruct struct {
2178 func returnEmpty() emptyStruct {
2179 return emptyStruct{}
2182 func takesEmpty(e emptyStruct) {
2185 func returnNonEmpty(i int) nonEmptyStruct {
2186 return nonEmptyStruct{member: i}
2189 func takesNonEmpty(n nonEmptyStruct) int {
2193 func TestCallWithStruct(t *testing.T) {
2194 r := ValueOf(returnEmpty).Call(nil)
2195 if len(r) != 1 || r[0].Type() != TypeOf(emptyStruct{}) {
2196 t.Errorf("returning empty struct returned %#v instead", r)
2198 r = ValueOf(takesEmpty).Call([]Value{ValueOf(emptyStruct{})})
2200 t.Errorf("takesEmpty returned values: %#v", r)
2202 r = ValueOf(returnNonEmpty).Call([]Value{ValueOf(42)})
2203 if len(r) != 1 || r[0].Type() != TypeOf(nonEmptyStruct{}) || r[0].Field(0).Int() != 42 {
2204 t.Errorf("returnNonEmpty returned %#v", r)
2206 r = ValueOf(takesNonEmpty).Call([]Value{ValueOf(nonEmptyStruct{member: 42})})
2207 if len(r) != 1 || r[0].Type() != TypeOf(1) || r[0].Int() != 42 {
2208 t.Errorf("takesNonEmpty returned %#v", r)
2212 func TestCallReturnsEmpty(t *testing.T) {
2213 // Issue 21717: past-the-end pointer write in Call with
2214 // nonzero-sized frame and zero-sized return value.
2216 var finalized uint32
2217 f := func() (emptyStruct, *[2]int64) {
2218 i := new([2]int64) // big enough to not be tinyalloc'd, so finalizer always runs when i dies
2219 runtime.SetFinalizer(i, func(*[2]int64) { atomic.StoreUint32(&finalized, 1) })
2220 return emptyStruct{}, i
2222 v := ValueOf(f).Call(nil)[0] // out[0] should not alias out[1]'s memory, so the finalizer should run.
2223 timeout := time.After(5 * time.Second)
2224 for atomic.LoadUint32(&finalized) == 0 {
2227 t.Fatal("finalizer did not run")
2233 runtime.KeepAlive(v)
2236 func TestMakeFunc(t *testing.T) {
2238 fv := MakeFunc(TypeOf(f), func(in []Value) []Value { return in })
2239 ValueOf(&f).Elem().Set(fv)
2241 // Call g with small arguments so that there is
2242 // something predictable (and different from the
2243 // correct results) in those positions on the stack.
2245 g(1, 2, 3, two{4, 5}, 6, 7, 8)
2247 // Call constructed function f.
2248 i, j, k, l, m, n, o := f(10, 20, 30, two{40, 50}, 60, 70, 80)
2249 if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 {
2250 t.Errorf("Call returned %d, %d, %d, %v, %d, %g, %d; want 10, 20, 30, [40, 50], 60, 70, 80", i, j, k, l, m, n, o)
2254 func TestMakeFuncInterface(t *testing.T) {
2255 fn := func(i int) int { return i }
2256 incr := func(in []Value) []Value {
2257 return []Value{ValueOf(int(in[0].Int() + 1))}
2259 fv := MakeFunc(TypeOf(fn), incr)
2260 ValueOf(&fn).Elem().Set(fv)
2261 if r := fn(2); r != 3 {
2262 t.Errorf("Call returned %d, want 3", r)
2264 if r := fv.Call([]Value{ValueOf(14)})[0].Int(); r != 15 {
2265 t.Errorf("Call returned %d, want 15", r)
2267 if r := fv.Interface().(func(int) int)(26); r != 27 {
2268 t.Errorf("Call returned %d, want 27", r)
2272 func TestMakeFuncVariadic(t *testing.T) {
2273 // Test that variadic arguments are packed into a slice and passed as last arg
2274 fn := func(_ int, is ...int) []int { return nil }
2275 fv := MakeFunc(TypeOf(fn), func(in []Value) []Value { return in[1:2] })
2276 ValueOf(&fn).Elem().Set(fv)
2279 if r[0] != 2 || r[1] != 3 {
2280 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1])
2283 r = fn(1, []int{2, 3}...)
2284 if r[0] != 2 || r[1] != 3 {
2285 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1])
2288 r = fv.Call([]Value{ValueOf(1), ValueOf(2), ValueOf(3)})[0].Interface().([]int)
2289 if r[0] != 2 || r[1] != 3 {
2290 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1])
2293 r = fv.CallSlice([]Value{ValueOf(1), ValueOf([]int{2, 3})})[0].Interface().([]int)
2294 if r[0] != 2 || r[1] != 3 {
2295 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1])
2298 f := fv.Interface().(func(int, ...int) []int)
2301 if r[0] != 2 || r[1] != 3 {
2302 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1])
2304 r = f(1, []int{2, 3}...)
2305 if r[0] != 2 || r[1] != 3 {
2306 t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1])
2310 // Dummy type that implements io.WriteCloser
2314 func (w *WC) Write(p []byte) (n int, err error) {
2317 func (w *WC) Close() error {
2321 func TestMakeFuncValidReturnAssignments(t *testing.T) {
2322 // reflect.Values returned from the wrapped function should be assignment-converted
2323 // to the types returned by the result of MakeFunc.
2325 // Concrete types should be promotable to interfaces they implement.
2327 f = MakeFunc(TypeOf(f), func([]Value) []Value {
2328 return []Value{ValueOf(io.EOF)}
2329 }).Interface().(func() error)
2332 // Super-interfaces should be promotable to simpler interfaces.
2333 var g func() io.Writer
2334 g = MakeFunc(TypeOf(g), func([]Value) []Value {
2335 var w io.WriteCloser = &WC{}
2336 return []Value{ValueOf(&w).Elem()}
2337 }).Interface().(func() io.Writer)
2340 // Channels should be promotable to directional channels.
2341 var h func() <-chan int
2342 h = MakeFunc(TypeOf(h), func([]Value) []Value {
2343 return []Value{ValueOf(make(chan int))}
2344 }).Interface().(func() <-chan int)
2347 // Unnamed types should be promotable to named types.
2348 type T struct{ a, b, c int }
2350 i = MakeFunc(TypeOf(i), func([]Value) []Value {
2351 return []Value{ValueOf(struct{ a, b, c int }{a: 1, b: 2, c: 3})}
2352 }).Interface().(func() T)
2356 func TestMakeFuncInvalidReturnAssignments(t *testing.T) {
2357 // Type doesn't implement the required interface.
2358 shouldPanic("", func() {
2360 f = MakeFunc(TypeOf(f), func([]Value) []Value {
2361 return []Value{ValueOf(int(7))}
2362 }).Interface().(func() error)
2365 // Assigning to an interface with additional methods.
2366 shouldPanic("", func() {
2367 var f func() io.ReadWriteCloser
2368 f = MakeFunc(TypeOf(f), func([]Value) []Value {
2369 var w io.WriteCloser = &WC{}
2370 return []Value{ValueOf(&w).Elem()}
2371 }).Interface().(func() io.ReadWriteCloser)
2374 // Directional channels can't be assigned to bidirectional ones.
2375 shouldPanic("", func() {
2376 var f func() chan int
2377 f = MakeFunc(TypeOf(f), func([]Value) []Value {
2378 var c <-chan int = make(chan int)
2379 return []Value{ValueOf(c)}
2380 }).Interface().(func() chan int)
2383 // Two named types which are otherwise identical.
2384 shouldPanic("", func() {
2385 type T struct{ a, b, c int }
2386 type U struct{ a, b, c int }
2388 f = MakeFunc(TypeOf(f), func([]Value) []Value {
2389 return []Value{ValueOf(U{a: 1, b: 2, c: 3})}
2390 }).Interface().(func() T)
2399 // This will be index 0.
2400 func (p Point) AnotherMethod(scale int) int {
2404 // This will be index 1.
2405 func (p Point) Dist(scale int) int {
2406 //println("Point.Dist", p.x, p.y, scale)
2407 return p.x*p.x*scale + p.y*p.y*scale
2410 // This will be index 2.
2411 func (p Point) GCMethod(k int) int {
2416 // This will be index 3.
2417 func (p Point) NoArgs() {
2418 // Exercise no-argument/no-result paths.
2421 // This will be index 4.
2422 func (p Point) TotalDist(points ...Point) int {
2424 for _, q := range points {
2427 tot += dx*dx + dy*dy // Should call Sqrt, but it's just a test.
2433 // This will be index 5.
2434 func (p *Point) Int64Method(x int64) int64 {
2438 // This will be index 6.
2439 func (p *Point) Int32Method(x int32) int32 {
2443 func TestMethod(t *testing.T) {
2444 // Non-curried method of type.
2446 i := TypeOf(p).Method(1).Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int()
2448 t.Errorf("Type Method returned %d; want 250", i)
2451 m, ok := TypeOf(p).MethodByName("Dist")
2453 t.Fatalf("method by name failed")
2455 i = m.Func.Call([]Value{ValueOf(p), ValueOf(11)})[0].Int()
2457 t.Errorf("Type MethodByName returned %d; want 275", i)
2460 m, ok = TypeOf(p).MethodByName("NoArgs")
2462 t.Fatalf("method by name failed")
2464 n := len(m.Func.Call([]Value{ValueOf(p)}))
2466 t.Errorf("NoArgs returned %d values; want 0", n)
2469 i = TypeOf(&p).Method(1).Func.Call([]Value{ValueOf(&p), ValueOf(12)})[0].Int()
2471 t.Errorf("Pointer Type Method returned %d; want 300", i)
2474 m, ok = TypeOf(&p).MethodByName("Dist")
2476 t.Fatalf("ptr method by name failed")
2478 i = m.Func.Call([]Value{ValueOf(&p), ValueOf(13)})[0].Int()
2480 t.Errorf("Pointer Type MethodByName returned %d; want 325", i)
2483 m, ok = TypeOf(&p).MethodByName("NoArgs")
2485 t.Fatalf("method by name failed")
2487 n = len(m.Func.Call([]Value{ValueOf(&p)}))
2489 t.Errorf("NoArgs returned %d values; want 0", n)
2492 _, ok = TypeOf(&p).MethodByName("AA")
2494 t.Errorf(`MethodByName("AA") should have failed`)
2497 _, ok = TypeOf(&p).MethodByName("ZZ")
2499 t.Errorf(`MethodByName("ZZ") should have failed`)
2502 // Curried method of value.
2503 tfunc := TypeOf((func(int) int)(nil))
2504 v := ValueOf(p).Method(1)
2505 if tt := v.Type(); tt != tfunc {
2506 t.Errorf("Value Method Type is %s; want %s", tt, tfunc)
2508 i = v.Call([]Value{ValueOf(14)})[0].Int()
2510 t.Errorf("Value Method returned %d; want 350", i)
2512 v = ValueOf(p).MethodByName("Dist")
2513 if tt := v.Type(); tt != tfunc {
2514 t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc)
2516 i = v.Call([]Value{ValueOf(15)})[0].Int()
2518 t.Errorf("Value MethodByName returned %d; want 375", i)
2520 v = ValueOf(p).MethodByName("NoArgs")
2523 // Curried method of pointer.
2524 v = ValueOf(&p).Method(1)
2525 if tt := v.Type(); tt != tfunc {
2526 t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc)
2528 i = v.Call([]Value{ValueOf(16)})[0].Int()
2530 t.Errorf("Pointer Value Method returned %d; want 400", i)
2532 v = ValueOf(&p).MethodByName("Dist")
2533 if tt := v.Type(); tt != tfunc {
2534 t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc)
2536 i = v.Call([]Value{ValueOf(17)})[0].Int()
2538 t.Errorf("Pointer Value MethodByName returned %d; want 425", i)
2540 v = ValueOf(&p).MethodByName("NoArgs")
2543 // Curried method of interface value.
2544 // Have to wrap interface value in a struct to get at it.
2545 // Passing it to ValueOf directly would
2546 // access the underlying Point, not the interface.
2550 pv := ValueOf(&x).Elem()
2552 if tt := v.Type(); tt != tfunc {
2553 t.Errorf("Interface Method Type is %s; want %s", tt, tfunc)
2555 i = v.Call([]Value{ValueOf(18)})[0].Int()
2557 t.Errorf("Interface Method returned %d; want 450", i)
2559 v = pv.MethodByName("Dist")
2560 if tt := v.Type(); tt != tfunc {
2561 t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc)
2563 i = v.Call([]Value{ValueOf(19)})[0].Int()
2565 t.Errorf("Interface MethodByName returned %d; want 475", i)
2569 func TestMethodValue(t *testing.T) {
2573 // Check that method value have the same underlying code pointers.
2574 if p1, p2 := ValueOf(Point{1, 1}).Method(1), ValueOf(Point{2, 2}).Method(1); p1.Pointer() != p2.Pointer() {
2575 t.Errorf("methodValueCall mismatched: %v - %v", p1, p2)
2578 // Curried method of value.
2579 tfunc := TypeOf((func(int) int)(nil))
2580 v := ValueOf(p).Method(1)
2581 if tt := v.Type(); tt != tfunc {
2582 t.Errorf("Value Method Type is %s; want %s", tt, tfunc)
2584 i = ValueOf(v.Interface()).Call([]Value{ValueOf(10)})[0].Int()
2586 t.Errorf("Value Method returned %d; want 250", i)
2588 v = ValueOf(p).MethodByName("Dist")
2589 if tt := v.Type(); tt != tfunc {
2590 t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc)
2592 i = ValueOf(v.Interface()).Call([]Value{ValueOf(11)})[0].Int()
2594 t.Errorf("Value MethodByName returned %d; want 275", i)
2596 v = ValueOf(p).MethodByName("NoArgs")
2597 ValueOf(v.Interface()).Call(nil)
2598 v.Interface().(func())()
2600 // Curried method of pointer.
2601 v = ValueOf(&p).Method(1)
2602 if tt := v.Type(); tt != tfunc {
2603 t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc)
2605 i = ValueOf(v.Interface()).Call([]Value{ValueOf(12)})[0].Int()
2607 t.Errorf("Pointer Value Method returned %d; want 300", i)
2609 v = ValueOf(&p).MethodByName("Dist")
2610 if tt := v.Type(); tt != tfunc {
2611 t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc)
2613 i = ValueOf(v.Interface()).Call([]Value{ValueOf(13)})[0].Int()
2615 t.Errorf("Pointer Value MethodByName returned %d; want 325", i)
2617 v = ValueOf(&p).MethodByName("NoArgs")
2618 ValueOf(v.Interface()).Call(nil)
2619 v.Interface().(func())()
2621 // Curried method of pointer to pointer.
2623 v = ValueOf(&pp).Elem().Method(1)
2624 if tt := v.Type(); tt != tfunc {
2625 t.Errorf("Pointer Pointer Value Method Type is %s; want %s", tt, tfunc)
2627 i = ValueOf(v.Interface()).Call([]Value{ValueOf(14)})[0].Int()
2629 t.Errorf("Pointer Pointer Value Method returned %d; want 350", i)
2631 v = ValueOf(&pp).Elem().MethodByName("Dist")
2632 if tt := v.Type(); tt != tfunc {
2633 t.Errorf("Pointer Pointer Value MethodByName Type is %s; want %s", tt, tfunc)
2635 i = ValueOf(v.Interface()).Call([]Value{ValueOf(15)})[0].Int()
2637 t.Errorf("Pointer Pointer Value MethodByName returned %d; want 375", i)
2640 // Curried method of interface value.
2641 // Have to wrap interface value in a struct to get at it.
2642 // Passing it to ValueOf directly would
2643 // access the underlying Point, not the interface.
2649 pv := ValueOf(s).Field(0)
2651 if tt := v.Type(); tt != tfunc {
2652 t.Errorf("Interface Method Type is %s; want %s", tt, tfunc)
2654 i = ValueOf(v.Interface()).Call([]Value{ValueOf(16)})[0].Int()
2656 t.Errorf("Interface Method returned %d; want 400", i)
2658 v = pv.MethodByName("Dist")
2659 if tt := v.Type(); tt != tfunc {
2660 t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc)
2662 i = ValueOf(v.Interface()).Call([]Value{ValueOf(17)})[0].Int()
2664 t.Errorf("Interface MethodByName returned %d; want 425", i)
2667 // For issue #33628: method args are not stored at the right offset
2669 m64 := ValueOf(&p).MethodByName("Int64Method").Interface().(func(int64) int64)
2670 if x := m64(123); x != 123 {
2671 t.Errorf("Int64Method returned %d; want 123", x)
2673 m32 := ValueOf(&p).MethodByName("Int32Method").Interface().(func(int32) int32)
2674 if x := m32(456); x != 456 {
2675 t.Errorf("Int32Method returned %d; want 456", x)
2679 func TestVariadicMethodValue(t *testing.T) {
2681 points := []Point{{20, 21}, {22, 23}, {24, 25}}
2682 want := int64(p.TotalDist(points[0], points[1], points[2]))
2684 // Variadic method of type.
2685 tfunc := TypeOf((func(Point, ...Point) int)(nil))
2686 if tt := TypeOf(p).Method(4).Type; tt != tfunc {
2687 t.Errorf("Variadic Method Type from TypeOf is %s; want %s", tt, tfunc)
2690 // Curried method of value.
2691 tfunc = TypeOf((func(...Point) int)(nil))
2692 v := ValueOf(p).Method(4)
2693 if tt := v.Type(); tt != tfunc {
2694 t.Errorf("Variadic Method Type is %s; want %s", tt, tfunc)
2696 i := ValueOf(v.Interface()).Call([]Value{ValueOf(points[0]), ValueOf(points[1]), ValueOf(points[2])})[0].Int()
2698 t.Errorf("Variadic Method returned %d; want %d", i, want)
2700 i = ValueOf(v.Interface()).CallSlice([]Value{ValueOf(points)})[0].Int()
2702 t.Errorf("Variadic Method CallSlice returned %d; want %d", i, want)
2705 f := v.Interface().(func(...Point) int)
2706 i = int64(f(points[0], points[1], points[2]))
2708 t.Errorf("Variadic Method Interface returned %d; want %d", i, want)
2710 i = int64(f(points...))
2712 t.Errorf("Variadic Method Interface Slice returned %d; want %d", i, want)
2716 type DirectIfaceT struct {
2720 func (d DirectIfaceT) M() int { return *d.p }
2722 func TestDirectIfaceMethod(t *testing.T) {
2724 v := DirectIfaceT{&x}
2726 m, ok := typ.MethodByName("M")
2728 t.Fatalf("cannot find method M")
2730 in := []Value{ValueOf(v)}
2731 out := m.Func.Call(in)
2732 if got := out[0].Int(); got != 42 {
2733 t.Errorf("Call with value receiver got %d, want 42", got)
2738 m, ok = typ.MethodByName("M")
2740 t.Fatalf("cannot find method M")
2742 in = []Value{ValueOf(pv)}
2743 out = m.Func.Call(in)
2744 if got := out[0].Int(); got != 42 {
2745 t.Errorf("Call with pointer receiver got %d, want 42", got)
2749 // Reflect version of $GOROOT/test/method5.go
2751 // Concrete types implementing M method.
2752 // Smaller than a word, word-sized, larger than a word.
2753 // Value and pointer receivers.
2755 type Tinter interface {
2756 M(int, byte) (byte, int)
2761 func (v Tsmallv) M(x int, b byte) (byte, int) { return b, x + int(v) }
2765 func (p *Tsmallp) M(x int, b byte) (byte, int) { return b, x + int(*p) }
2769 func (v Twordv) M(x int, b byte) (byte, int) { return b, x + int(v) }
2773 func (p *Twordp) M(x int, b byte) (byte, int) { return b, x + int(*p) }
2775 type Tbigv [2]uintptr
2777 func (v Tbigv) M(x int, b byte) (byte, int) { return b, x + int(v[0]) + int(v[1]) }
2779 type Tbigp [2]uintptr
2781 func (p *Tbigp) M(x int, b byte) (byte, int) { return b, x + int(p[0]) + int(p[1]) }
2783 type tinter interface {
2784 m(int, byte) (byte, int)
2787 // Embedding via pointer.
2804 func (t4 Tm4) M(x int, b byte) (byte, int) { return b, x + 40 }
2806 func TestMethod5(t *testing.T) {
2807 CheckF := func(name string, f func(int, byte) (byte, int), inc int) {
2809 if b != 99 || x != 1000+inc {
2810 t.Errorf("%s(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc)
2814 CheckV := func(name string, i Value, inc int) {
2815 bx := i.Method(0).Call([]Value{ValueOf(1000), ValueOf(byte(99))})
2816 b := bx[0].Interface()
2817 x := bx[1].Interface()
2818 if b != byte(99) || x != 1000+inc {
2819 t.Errorf("direct %s.M(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc)
2822 CheckF(name+".M", i.Method(0).Interface().(func(int, byte) (byte, int)), inc)
2825 var TinterType = TypeOf(new(Tinter)).Elem()
2827 CheckI := func(name string, i any, inc int) {
2829 CheckV(name, v, inc)
2830 CheckV("(i="+name+")", v.Convert(TinterType), inc)
2835 CheckI("&sv", &sv, 1)
2838 CheckI("&sp", &sp, 2)
2842 CheckI("&wv", &wv, 3)
2845 CheckI("&wp", &wp, 4)
2847 bv := Tbigv([2]uintptr{5, 6})
2848 CheckI("bv", bv, 11)
2849 CheckI("&bv", &bv, 11)
2851 bp := Tbigp([2]uintptr{7, 8})
2852 CheckI("&bp", &bp, 15)
2858 CheckI("t4", t4, 40)
2859 CheckI("&t4", &t4, 40)
2860 CheckI("t3", t3, 40)
2861 CheckI("&t3", &t3, 40)
2862 CheckI("t2", t2, 40)
2863 CheckI("&t2", &t2, 40)
2864 CheckI("t1", t1, 40)
2865 CheckI("&t1", &t1, 40)
2868 vnil := ValueOf(&tnil).Elem()
2869 shouldPanic("Method", func() { vnil.Method(0) })
2872 func TestInterfaceSet(t *testing.T) {
2881 sv := ValueOf(&s).Elem()
2882 sv.Field(0).Set(ValueOf(p))
2883 if q := s.I.(*Point); q != p {
2884 t.Errorf("i: have %p want %p", q, p)
2889 if q := s.P.(*Point); q != p {
2890 t.Errorf("i: have %p want %p", q, p)
2893 i := pv.Method(0).Call([]Value{ValueOf(10)})[0].Int()
2895 t.Errorf("Interface Method returned %d; want 250", i)
2904 func TestAnonymousFields(t *testing.T) {
2905 var field StructField
2909 if field, ok = type1.FieldByName("int"); !ok {
2910 t.Fatal("no field 'int'")
2912 if field.Index[0] != 1 {
2913 t.Error("field index should be 1; is", field.Index)
2967 // The X in S6 and S7 annihilate, but they also block the X in S8.S9.
2989 // The X in S11.S6 and S12.S6 annihilate, but they also block the X in S13.S8.S9.
3008 // The X in S15.S11.S1 and S16.S11.S1 annihilate.
3022 var fieldTests = []FTest{
3023 {struct{}{}, "", nil, 0},
3024 {struct{}{}, "Foo", nil, 0},
3025 {S0{A: 'a'}, "A", []int{0}, 'a'},
3026 {S0{}, "D", nil, 0},
3027 {S1{S0: S0{A: 'a'}}, "A", []int{1, 0}, 'a'},
3028 {S1{B: 'b'}, "B", []int{0}, 'b'},
3029 {S1{}, "S0", []int{1}, 0},
3030 {S1{S0: S0{C: 'c'}}, "C", []int{1, 2}, 'c'},
3031 {S2{A: 'a'}, "A", []int{0}, 'a'},
3032 {S2{}, "S1", []int{1}, 0},
3033 {S2{S1: &S1{B: 'b'}}, "B", []int{1, 0}, 'b'},
3034 {S2{S1: &S1{S0: S0{C: 'c'}}}, "C", []int{1, 1, 2}, 'c'},
3035 {S2{}, "D", nil, 0},
3036 {S3{}, "S1", nil, 0},
3037 {S3{S2: S2{A: 'a'}}, "A", []int{1, 0}, 'a'},
3038 {S3{}, "B", nil, 0},
3039 {S3{D: 'd'}, "D", []int{2}, 0},
3040 {S3{E: 'e'}, "E", []int{3}, 'e'},
3041 {S4{A: 'a'}, "A", []int{1}, 'a'},
3042 {S4{}, "B", nil, 0},
3043 {S5{}, "X", nil, 0},
3044 {S5{}, "Y", []int{2, 0, 1}, 0},
3045 {S10{}, "X", nil, 0},
3046 {S10{}, "Y", []int{2, 0, 0, 1}, 0},
3047 {S14{}, "X", nil, 0},
3050 func TestFieldByIndex(t *testing.T) {
3051 for _, test := range fieldTests {
3053 f := s.FieldByIndex(test.index)
3055 if test.index != nil {
3056 if f.Name != test.name {
3057 t.Errorf("%s.%s found; want %s", s.Name(), f.Name, test.name)
3060 t.Errorf("%s.%s found", s.Name(), f.Name)
3062 } else if len(test.index) > 0 {
3063 t.Errorf("%s.%s not found", s.Name(), test.name)
3066 if test.value != 0 {
3067 v := ValueOf(test.s).FieldByIndex(test.index)
3069 if x, ok := v.Interface().(int); ok {
3070 if x != test.value {
3071 t.Errorf("%s%v is %d; want %d", s.Name(), test.index, x, test.value)
3074 t.Errorf("%s%v value not an int", s.Name(), test.index)
3077 t.Errorf("%s%v value not found", s.Name(), test.index)
3083 func TestFieldByName(t *testing.T) {
3084 for _, test := range fieldTests {
3086 f, found := s.FieldByName(test.name)
3088 if test.index != nil {
3089 // Verify field depth and index.
3090 if len(f.Index) != len(test.index) {
3091 t.Errorf("%s.%s depth %d; want %d: %v vs %v", s.Name(), test.name, len(f.Index), len(test.index), f.Index, test.index)
3093 for i, x := range f.Index {
3094 if x != test.index[i] {
3095 t.Errorf("%s.%s.Index[%d] is %d; want %d", s.Name(), test.name, i, x, test.index[i])
3100 t.Errorf("%s.%s found", s.Name(), f.Name)
3102 } else if len(test.index) > 0 {
3103 t.Errorf("%s.%s not found", s.Name(), test.name)
3106 if test.value != 0 {
3107 v := ValueOf(test.s).FieldByName(test.name)
3109 if x, ok := v.Interface().(int); ok {
3110 if x != test.value {
3111 t.Errorf("%s.%s is %d; want %d", s.Name(), test.name, x, test.value)
3114 t.Errorf("%s.%s value not an int", s.Name(), test.name)
3117 t.Errorf("%s.%s value not found", s.Name(), test.name)
3123 func TestImportPath(t *testing.T) {
3128 {TypeOf(&base64.Encoding{}).Elem(), "encoding/base64"},
3129 {TypeOf(int(0)), ""},
3130 {TypeOf(int8(0)), ""},
3131 {TypeOf(int16(0)), ""},
3132 {TypeOf(int32(0)), ""},
3133 {TypeOf(int64(0)), ""},
3134 {TypeOf(uint(0)), ""},
3135 {TypeOf(uint8(0)), ""},
3136 {TypeOf(uint16(0)), ""},
3137 {TypeOf(uint32(0)), ""},
3138 {TypeOf(uint64(0)), ""},
3139 {TypeOf(uintptr(0)), ""},
3140 {TypeOf(float32(0)), ""},
3141 {TypeOf(float64(0)), ""},
3142 {TypeOf(complex64(0)), ""},
3143 {TypeOf(complex128(0)), ""},
3144 {TypeOf(byte(0)), ""},
3145 {TypeOf(rune(0)), ""},
3146 {TypeOf([]byte(nil)), ""},
3147 {TypeOf([]rune(nil)), ""},
3148 {TypeOf(string("")), ""},
3149 {TypeOf((*any)(nil)).Elem(), ""},
3150 {TypeOf((*byte)(nil)), ""},
3151 {TypeOf((*rune)(nil)), ""},
3152 {TypeOf((*int64)(nil)), ""},
3153 {TypeOf(map[string]int{}), ""},
3154 {TypeOf((*error)(nil)).Elem(), ""},
3155 {TypeOf((*Point)(nil)), ""},
3156 {TypeOf((*Point)(nil)).Elem(), "reflect_test"},
3158 for _, test := range tests {
3159 if path := test.t.PkgPath(); path != test.path {
3160 t.Errorf("%v.PkgPath() = %q, want %q", test.t, path, test.path)
3165 func TestFieldPkgPath(t *testing.T) {
3167 typ := TypeOf(struct {
3175 type pkgpathTest struct {
3182 checkPkgPath := func(name string, s []pkgpathTest) {
3183 for _, test := range s {
3184 f := typ.FieldByIndex(test.index)
3185 if got, want := f.PkgPath, test.pkgPath; got != want {
3186 t.Errorf("%s: Field(%d).PkgPath = %q, want %q", name, test.index, got, want)
3188 if got, want := f.Anonymous, test.embedded; got != want {
3189 t.Errorf("%s: Field(%d).Anonymous = %v, want %v", name, test.index, got, want)
3191 if got, want := f.IsExported(), test.exported; got != want {
3192 t.Errorf("%s: Field(%d).IsExported = %v, want %v", name, test.index, got, want)
3197 checkPkgPath("testStruct", []pkgpathTest{
3198 {[]int{0}, "", false, true}, // Exported
3199 {[]int{1}, "reflect_test", false, false}, // unexported
3200 {[]int{2}, "", true, true}, // OtherPkgFields
3201 {[]int{2, 0}, "", false, true}, // OtherExported
3202 {[]int{2, 1}, "reflect", false, false}, // otherUnexported
3203 {[]int{3}, "reflect_test", true, false}, // int
3204 {[]int{4}, "reflect_test", true, false}, // *x
3207 type localOtherPkgFields OtherPkgFields
3208 typ = TypeOf(localOtherPkgFields{})
3209 checkPkgPath("localOtherPkgFields", []pkgpathTest{
3210 {[]int{0}, "", false, true}, // OtherExported
3211 {[]int{1}, "reflect", false, false}, // otherUnexported
3215 func TestMethodPkgPath(t *testing.T) {
3220 typ := TypeOf((*interface {
3233 {"x", "reflect_test", false},
3234 {"y", "reflect_test", false},
3237 for _, test := range tests {
3238 m, _ := typ.MethodByName(test.name)
3239 if got, want := m.PkgPath, test.pkgPath; got != want {
3240 t.Errorf("MethodByName(%q).PkgPath = %q, want %q", test.name, got, want)
3242 if got, want := m.IsExported(), test.exported; got != want {
3243 t.Errorf("MethodByName(%q).IsExported = %v, want %v", test.name, got, want)
3248 func TestVariadicType(t *testing.T) {
3249 // Test example from Type documentation.
3250 var f func(x int, y ...float64)
3252 if typ.NumIn() == 2 && typ.In(0) == TypeOf(int(0)) {
3254 if sl.Kind() == Slice {
3255 if sl.Elem() == TypeOf(0.0) {
3263 t.Errorf("want NumIn() = 2, In(0) = int, In(1) = []float64")
3264 s := fmt.Sprintf("have NumIn() = %d", typ.NumIn())
3265 for i := 0; i < typ.NumIn(); i++ {
3266 s += fmt.Sprintf(", In(%d) = %s", i, typ.In(i))
3280 func (*inner) M() {}
3281 func (*outer) M() {}
3283 func TestNestedMethods(t *testing.T) {
3284 typ := TypeOf((*outer)(nil))
3285 if typ.NumMethod() != 1 || typ.Method(0).Func.UnsafePointer() != ValueOf((*outer).M).UnsafePointer() {
3286 t.Errorf("Wrong method table for outer: (M=%p)", (*outer).M)
3287 for i := 0; i < typ.NumMethod(); i++ {
3289 t.Errorf("\t%d: %s %p\n", i, m.Name, m.Func.UnsafePointer())
3296 func (*unexp) f() (int32, int8) { return 7, 7 }
3297 func (*unexp) g() (int64, int8) { return 8, 8 }
3299 type unexpI interface {
3303 func TestUnexportedMethods(t *testing.T) {
3304 typ := TypeOf(new(unexp))
3305 if got := typ.NumMethod(); got != 0 {
3306 t.Errorf("NumMethod=%d, want 0 satisfied methods", got)
3309 typ = TypeOf((*unexpI)(nil))
3310 if got := typ.Elem().NumMethod(); got != 1 {
3311 t.Errorf("NumMethod=%d, want 1 satisfied methods", got)
3315 type InnerInt struct {
3319 type OuterInt struct {
3324 func (i *InnerInt) M() int {
3328 func TestEmbeddedMethods(t *testing.T) {
3329 typ := TypeOf((*OuterInt)(nil))
3330 if typ.NumMethod() != 1 || typ.Method(0).Func.UnsafePointer() != ValueOf((*OuterInt).M).UnsafePointer() {
3331 t.Errorf("Wrong method table for OuterInt: (m=%p)", (*OuterInt).M)
3332 for i := 0; i < typ.NumMethod(); i++ {
3334 t.Errorf("\t%d: %s %p\n", i, m.Name, m.Func.UnsafePointer())
3339 if v := ValueOf(i).Method(0).Call(nil)[0].Int(); v != 3 {
3340 t.Errorf("i.M() = %d, want 3", v)
3343 o := &OuterInt{1, InnerInt{2}}
3344 if v := ValueOf(o).Method(0).Call(nil)[0].Int(); v != 2 {
3345 t.Errorf("i.M() = %d, want 2", v)
3349 if v := f(o); v != 2 {
3350 t.Errorf("f(o) = %d, want 2", v)
3354 type FuncDDD func(...any) error
3356 func (f FuncDDD) M() {}
3358 func TestNumMethodOnDDD(t *testing.T) {
3359 rv := ValueOf((FuncDDD)(nil))
3360 if n := rv.NumMethod(); n != 1 {
3361 t.Fatalf("NumMethod()=%d, want 1", n)
3365 func TestPtrTo(t *testing.T) {
3366 // This block of code means that the ptrToThis field of the
3367 // reflect data for *unsafe.Pointer is non zero, see
3368 // https://golang.org/issue/19003
3369 var x unsafe.Pointer
3376 for i = 0; i < 100; i++ {
3377 typ = PointerTo(typ)
3379 for i = 0; i < 100; i++ {
3382 if typ != TypeOf(z) {
3383 t.Errorf("after 100 PointerTo and Elem, have %s, want %s", typ, TypeOf(z))
3387 func TestPtrToGC(t *testing.T) {
3389 tt := TypeOf(T(nil))
3393 for i := 0; i < n; i++ {
3398 v.Elem().Set(ValueOf(p).Convert(pt))
3399 x = append(x, v.Interface())
3403 for i, xi := range x {
3404 k := ValueOf(xi).Elem().Elem().Elem().Interface().(uintptr)
3405 if k != uintptr(i) {
3406 t.Errorf("lost x[%d] = %d, want %d", i, k, i)
3411 func TestAddr(t *testing.T) {
3423 t.Errorf("Addr.Elem.Set failed to set value")
3426 // Again but take address of the ValueOf value.
3427 // Exercises generation of PtrTypes not present in the binary.
3429 v = ValueOf(&q).Elem()
3438 t.Errorf("Addr.Elem.Set failed to set value")
3441 // Starting without pointer we should get changed value
3444 v = ValueOf(&qq).Elem()
3450 if p.X != 3 { // should be unchanged from last time
3451 t.Errorf("somehow value Set changed original p")
3453 p = v0.Interface().(struct {
3457 t.Errorf("Addr.Elem.Set valued to set value in top value")
3460 // Verify that taking the address of a type gives us a pointer
3461 // which we can convert back using the usual interface
3466 ps := ValueOf(&s).Elem().Field(0).Addr().Interface()
3467 *(ps.(**bool)) = new(bool)
3469 t.Errorf("Addr.Interface direct assignment failed")
3473 func noAlloc(t *testing.T, n int, f func(int)) {
3474 if testing.Short() {
3475 t.Skip("skipping malloc count in short mode")
3477 if runtime.GOMAXPROCS(0) > 1 {
3478 t.Skip("skipping; GOMAXPROCS>1")
3481 allocs := testing.AllocsPerRun(n, func() {
3486 t.Errorf("%d iterations: got %v mallocs, want 0", n, allocs)
3490 func TestAllocations(t *testing.T) {
3491 noAlloc(t, 100, func(j int) {
3495 // We can uncomment this when compiler escape analysis
3496 // is good enough to see that the integer assigned to i
3497 // does not escape and therefore need not be allocated.
3501 // if int(v.Int()) != 42+j {
3502 // panic("wrong int")
3505 i = func(j int) int { return j }
3507 if v.Interface().(func(int) int)(j) != j {
3508 panic("wrong result")
3513 func TestSmallNegativeInt(t *testing.T) {
3517 t.Errorf("int16(-1).Int() returned %v", v.Int())
3521 func TestIndex(t *testing.T) {
3522 xs := []byte{1, 2, 3, 4, 5, 6, 7, 8}
3523 v := ValueOf(xs).Index(3).Interface().(byte)
3525 t.Errorf("xs.Index(3) = %v; expected %v", v, xs[3])
3527 xa := [8]byte{10, 20, 30, 40, 50, 60, 70, 80}
3528 v = ValueOf(xa).Index(2).Interface().(byte)
3530 t.Errorf("xa.Index(2) = %v; expected %v", v, xa[2])
3533 v = ValueOf(s).Index(3).Interface().(byte)
3535 t.Errorf("s.Index(3) = %v; expected %v", v, s[3])
3539 func TestSlice(t *testing.T) {
3540 xs := []int{1, 2, 3, 4, 5, 6, 7, 8}
3541 v := ValueOf(xs).Slice(3, 5).Interface().([]int)
3543 t.Errorf("len(xs.Slice(3, 5)) = %d", len(v))
3546 t.Errorf("cap(xs.Slice(3, 5)) = %d", cap(v))
3548 if !DeepEqual(v[0:5], xs[3:]) {
3549 t.Errorf("xs.Slice(3, 5)[0:5] = %v", v[0:5])
3551 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80}
3552 v = ValueOf(&xa).Elem().Slice(2, 5).Interface().([]int)
3554 t.Errorf("len(xa.Slice(2, 5)) = %d", len(v))
3557 t.Errorf("cap(xa.Slice(2, 5)) = %d", cap(v))
3559 if !DeepEqual(v[0:6], xa[2:]) {
3560 t.Errorf("xs.Slice(2, 5)[0:6] = %v", v[0:6])
3563 vs := ValueOf(s).Slice(3, 5).Interface().(string)
3565 t.Errorf("s.Slice(3, 5) = %q; expected %q", vs, s[3:5])
3568 rv := ValueOf(&xs).Elem()
3570 ptr2 := rv.UnsafePointer()
3572 ptr3 := rv.UnsafePointer()
3574 t.Errorf("xs.Slice(3,4).Slice3(5,5).UnsafePointer() = %p, want %p", ptr3, ptr2)
3578 func TestSlice3(t *testing.T) {
3579 xs := []int{1, 2, 3, 4, 5, 6, 7, 8}
3580 v := ValueOf(xs).Slice3(3, 5, 7).Interface().([]int)
3582 t.Errorf("len(xs.Slice3(3, 5, 7)) = %d", len(v))
3585 t.Errorf("cap(xs.Slice3(3, 5, 7)) = %d", cap(v))
3587 if !DeepEqual(v[0:4], xs[3:7:7]) {
3588 t.Errorf("xs.Slice3(3, 5, 7)[0:4] = %v", v[0:4])
3590 rv := ValueOf(&xs).Elem()
3591 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) })
3592 shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) })
3593 shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) })
3595 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80}
3596 v = ValueOf(&xa).Elem().Slice3(2, 5, 6).Interface().([]int)
3598 t.Errorf("len(xa.Slice(2, 5, 6)) = %d", len(v))
3601 t.Errorf("cap(xa.Slice(2, 5, 6)) = %d", cap(v))
3603 if !DeepEqual(v[0:4], xa[2:6:6]) {
3604 t.Errorf("xs.Slice(2, 5, 6)[0:4] = %v", v[0:4])
3606 rv = ValueOf(&xa).Elem()
3607 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) })
3608 shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) })
3609 shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) })
3612 rv = ValueOf(&s).Elem()
3613 shouldPanic("Slice3", func() { rv.Slice3(1, 2, 3) })
3615 rv = ValueOf(&xs).Elem()
3616 rv = rv.Slice3(3, 5, 7)
3617 ptr2 := rv.UnsafePointer()
3618 rv = rv.Slice3(4, 4, 4)
3619 ptr3 := rv.UnsafePointer()
3621 t.Errorf("xs.Slice3(3,5,7).Slice3(4,4,4).UnsafePointer() = %p, want %p", ptr3, ptr2)
3625 func TestSetLenCap(t *testing.T) {
3626 xs := []int{1, 2, 3, 4, 5, 6, 7, 8}
3627 xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80}
3629 vs := ValueOf(&xs).Elem()
3630 shouldPanic("SetLen", func() { vs.SetLen(10) })
3631 shouldPanic("SetCap", func() { vs.SetCap(10) })
3632 shouldPanic("SetLen", func() { vs.SetLen(-1) })
3633 shouldPanic("SetCap", func() { vs.SetCap(-1) })
3634 shouldPanic("SetCap", func() { vs.SetCap(6) }) // smaller than len
3636 if len(xs) != 5 || cap(xs) != 8 {
3637 t.Errorf("after SetLen(5), len, cap = %d, %d, want 5, 8", len(xs), cap(xs))
3640 if len(xs) != 5 || cap(xs) != 6 {
3641 t.Errorf("after SetCap(6), len, cap = %d, %d, want 5, 6", len(xs), cap(xs))
3644 if len(xs) != 5 || cap(xs) != 5 {
3645 t.Errorf("after SetCap(5), len, cap = %d, %d, want 5, 5", len(xs), cap(xs))
3647 shouldPanic("SetCap", func() { vs.SetCap(4) }) // smaller than len
3648 shouldPanic("SetLen", func() { vs.SetLen(6) }) // bigger than cap
3650 va := ValueOf(&xa).Elem()
3651 shouldPanic("SetLen", func() { va.SetLen(8) })
3652 shouldPanic("SetCap", func() { va.SetCap(8) })
3655 func TestVariadic(t *testing.T) {
3656 var b strings.Builder
3660 V(fmt.Fprintf).Call([]Value{V(&b), V("%s, %d world"), V("hello"), V(42)})
3661 if b.String() != "hello, 42 world" {
3662 t.Errorf("after Fprintf Call: %q != %q", b.String(), "hello 42 world")
3666 V(fmt.Fprintf).CallSlice([]Value{V(&b), V("%s, %d world"), V([]any{"hello", 42})})
3667 if b.String() != "hello, 42 world" {
3668 t.Errorf("after Fprintf CallSlice: %q != %q", b.String(), "hello 42 world")
3672 func TestFuncArg(t *testing.T) {
3673 f1 := func(i int, f func(int) int) int { return f(i) }
3674 f2 := func(i int) int { return i + 1 }
3675 r := ValueOf(f1).Call([]Value{ValueOf(100), ValueOf(f2)})
3676 if r[0].Int() != 101 {
3677 t.Errorf("function returned %d, want 101", r[0].Int())
3681 func TestStructArg(t *testing.T) {
3682 type padded struct {
3689 wantA = padded{"3", 4}
3692 f := func(a padded, b uint32) {
3695 ValueOf(f).Call([]Value{ValueOf(wantA), ValueOf(wantB)})
3696 if gotA != wantA || gotB != wantB {
3697 t.Errorf("function called with (%v, %v), want (%v, %v)", gotA, gotB, wantA, wantB)
3701 var tagGetTests = []struct {
3706 {`protobuf:"PB(1,2)"`, `protobuf`, `PB(1,2)`},
3707 {`protobuf:"PB(1,2)"`, `foo`, ``},
3708 {`protobuf:"PB(1,2)"`, `rotobuf`, ``},
3709 {`protobuf:"PB(1,2)" json:"name"`, `json`, `name`},
3710 {`protobuf:"PB(1,2)" json:"name"`, `protobuf`, `PB(1,2)`},
3711 {`k0:"values contain spaces" k1:"and\ttabs"`, "k0", "values contain spaces"},
3712 {`k0:"values contain spaces" k1:"and\ttabs"`, "k1", "and\ttabs"},
3715 func TestTagGet(t *testing.T) {
3716 for _, tt := range tagGetTests {
3717 if v := tt.Tag.Get(tt.Key); v != tt.Value {
3718 t.Errorf("StructTag(%#q).Get(%#q) = %#q, want %#q", tt.Tag, tt.Key, v, tt.Value)
3723 func TestBytes(t *testing.T) {
3724 shouldPanic("on int Value", func() { ValueOf(0).Bytes() })
3725 shouldPanic("of non-byte slice", func() { ValueOf([]string{}).Bytes() })
3729 y := ValueOf(x).Bytes()
3730 if !bytes.Equal(x, y) {
3731 t.Fatalf("ValueOf(%v).Bytes() = %v", x, y)
3734 t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0])
3739 shouldPanic("unaddressable", func() { ValueOf(a).Bytes() })
3740 shouldPanic("on ptr Value", func() { ValueOf(&a).Bytes() })
3741 b := ValueOf(&a).Elem().Bytes()
3742 if !bytes.Equal(a[:], y) {
3743 t.Fatalf("ValueOf(%v).Bytes() = %v", a, b)
3746 t.Errorf("ValueOf(%p).Bytes() = %p", &a[0], &b[0])
3749 // Per issue #24746, it was decided that Bytes can be called on byte slices
3750 // that normally cannot be converted from per Go language semantics.
3754 ValueOf([]B{1, 2, 3, 4}).Bytes() // should not panic
3755 ValueOf(new([4]B)).Elem().Bytes() // should not panic
3756 ValueOf(SB{1, 2, 3, 4}).Bytes() // should not panic
3757 ValueOf(new(AB)).Elem().Bytes() // should not panic
3760 func TestSetBytes(t *testing.T) {
3763 y := []byte{1, 2, 3, 4}
3764 ValueOf(&x).Elem().SetBytes(y)
3765 if !bytes.Equal(x, y) {
3766 t.Fatalf("ValueOf(%v).Bytes() = %v", x, y)
3769 t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0])
3773 type Private struct {
3779 func (p *Private) m() {
3782 type private struct {
3790 func (p *private) P() {
3793 type Public struct {
3799 func (p *Public) M() {
3802 func TestUnexported(t *testing.T) {
3807 isValid(v.Elem().Field(0))
3808 isValid(v.Elem().Field(1))
3809 isValid(v.Elem().Field(2))
3810 isValid(v.Elem().FieldByName("X"))
3811 isValid(v.Elem().FieldByName("Y"))
3812 isValid(v.Elem().FieldByName("Z"))
3813 isValid(v.Type().Method(0).Func)
3814 m, _ := v.Type().MethodByName("M")
3816 m, _ = v.Type().MethodByName("P")
3818 isNonNil(v.Elem().Field(0).Interface())
3819 isNonNil(v.Elem().Field(1).Interface())
3820 isNonNil(v.Elem().Field(2).Field(2).Index(0))
3821 isNonNil(v.Elem().FieldByName("X").Interface())
3822 isNonNil(v.Elem().FieldByName("Y").Interface())
3823 isNonNil(v.Elem().FieldByName("Z").Interface())
3824 isNonNil(v.Elem().FieldByName("S").Index(0).Interface())
3825 isNonNil(v.Type().Method(0).Func.Interface())
3826 m, _ = v.Type().MethodByName("P")
3827 isNonNil(m.Func.Interface())
3831 isValid(v.Elem().Field(0))
3832 isValid(v.Elem().Field(1))
3833 isValid(v.Elem().FieldByName("x"))
3834 isValid(v.Elem().FieldByName("y"))
3835 shouldPanic("Interface", func() { v.Elem().Field(0).Interface() })
3836 shouldPanic("Interface", func() { v.Elem().Field(1).Interface() })
3837 shouldPanic("Interface", func() { v.Elem().FieldByName("x").Interface() })
3838 shouldPanic("Interface", func() { v.Elem().FieldByName("y").Interface() })
3839 shouldPanic("Method", func() { v.Type().Method(0) })
3842 func TestSetPanic(t *testing.T) {
3843 ok := func(f func()) { f() }
3844 bad := func(f func()) { shouldPanic("Set", f) }
3845 clear := func(v Value) { v.Set(Zero(v.Type())) }
3873 bad(func() { clear(v.Field(0)) }) // .X
3874 bad(func() { clear(v.Field(1)) }) // .t1
3875 bad(func() { clear(v.Field(1).Field(0)) }) // .t1.Y
3876 bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0
3877 bad(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W
3878 bad(func() { clear(v.Field(2)) }) // .T2
3879 bad(func() { clear(v.Field(2).Field(0)) }) // .T2.Z
3880 bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0
3881 bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W
3882 bad(func() { clear(v.Field(3)) }) // .NamedT1
3883 bad(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y
3884 bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0
3885 bad(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W
3886 bad(func() { clear(v.Field(4)) }) // .NamedT2
3887 bad(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z
3888 bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0
3889 bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W
3890 bad(func() { clear(v.Field(5)) }) // .namedT1
3891 bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y
3892 bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0
3893 bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W
3894 bad(func() { clear(v.Field(6)) }) // .namedT2
3895 bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z
3896 bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0
3897 bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W
3900 v = ValueOf(&T{}).Elem()
3901 ok(func() { clear(v.Field(0)) }) // .X
3902 bad(func() { clear(v.Field(1)) }) // .t1
3903 ok(func() { clear(v.Field(1).Field(0)) }) // .t1.Y
3904 bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0
3905 ok(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W
3906 ok(func() { clear(v.Field(2)) }) // .T2
3907 ok(func() { clear(v.Field(2).Field(0)) }) // .T2.Z
3908 bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0
3909 bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W
3910 ok(func() { clear(v.Field(3)) }) // .NamedT1
3911 ok(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y
3912 bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0
3913 ok(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W
3914 ok(func() { clear(v.Field(4)) }) // .NamedT2
3915 ok(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z
3916 bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0
3917 bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W
3918 bad(func() { clear(v.Field(5)) }) // .namedT1
3919 bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y
3920 bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0
3921 bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W
3922 bad(func() { clear(v.Field(6)) }) // .namedT2
3923 bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z
3924 bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0
3925 bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W
3930 func (t timp) W() {}
3931 func (t timp) Y() {}
3932 func (t timp) w() {}
3933 func (t timp) y() {}
3935 func TestCallPanic(t *testing.T) {
3960 ok := func(f func()) { f() }
3961 badCall := func(f func()) { shouldPanic("Call", f) }
3962 badMethod := func(f func()) { shouldPanic("Method", f) }
3963 call := func(v Value) { v.Call(nil) }
3966 v := ValueOf(T{i, i, i, i, T2{i, i}, i, i, T2{i, i}})
3967 badCall(func() { call(v.Field(0).Method(0)) }) // .t0.W
3968 badCall(func() { call(v.Field(0).Elem().Method(0)) }) // .t0.W
3969 badCall(func() { call(v.Field(0).Method(1)) }) // .t0.w
3970 badMethod(func() { call(v.Field(0).Elem().Method(2)) }) // .t0.w
3971 ok(func() { call(v.Field(1).Method(0)) }) // .T1.Y
3972 ok(func() { call(v.Field(1).Elem().Method(0)) }) // .T1.Y
3973 badCall(func() { call(v.Field(1).Method(1)) }) // .T1.y
3974 badMethod(func() { call(v.Field(1).Elem().Method(2)) }) // .T1.y
3976 ok(func() { call(v.Field(2).Method(0)) }) // .NamedT0.W
3977 ok(func() { call(v.Field(2).Elem().Method(0)) }) // .NamedT0.W
3978 badCall(func() { call(v.Field(2).Method(1)) }) // .NamedT0.w
3979 badMethod(func() { call(v.Field(2).Elem().Method(2)) }) // .NamedT0.w
3981 ok(func() { call(v.Field(3).Method(0)) }) // .NamedT1.Y
3982 ok(func() { call(v.Field(3).Elem().Method(0)) }) // .NamedT1.Y
3983 badCall(func() { call(v.Field(3).Method(1)) }) // .NamedT1.y
3984 badMethod(func() { call(v.Field(3).Elem().Method(3)) }) // .NamedT1.y
3986 ok(func() { call(v.Field(4).Field(0).Method(0)) }) // .NamedT2.T1.Y
3987 ok(func() { call(v.Field(4).Field(0).Elem().Method(0)) }) // .NamedT2.T1.W
3988 badCall(func() { call(v.Field(4).Field(1).Method(0)) }) // .NamedT2.t0.W
3989 badCall(func() { call(v.Field(4).Field(1).Elem().Method(0)) }) // .NamedT2.t0.W
3991 badCall(func() { call(v.Field(5).Method(0)) }) // .namedT0.W
3992 badCall(func() { call(v.Field(5).Elem().Method(0)) }) // .namedT0.W
3993 badCall(func() { call(v.Field(5).Method(1)) }) // .namedT0.w
3994 badMethod(func() { call(v.Field(5).Elem().Method(2)) }) // .namedT0.w
3996 badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.Y
3997 badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.Y
3998 badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.y
3999 badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.y
4001 badCall(func() { call(v.Field(7).Field(0).Method(0)) }) // .namedT2.T1.Y
4002 badCall(func() { call(v.Field(7).Field(0).Elem().Method(0)) }) // .namedT2.T1.W
4003 badCall(func() { call(v.Field(7).Field(1).Method(0)) }) // .namedT2.t0.W
4004 badCall(func() { call(v.Field(7).Field(1).Elem().Method(0)) }) // .namedT2.t0.W
4007 func TestValuePanic(t *testing.T) {
4009 shouldPanic("reflect.Value.Addr of unaddressable value", func() { vo(0).Addr() })
4010 shouldPanic("call of reflect.Value.Bool on float64 Value", func() { vo(0.0).Bool() })
4011 shouldPanic("call of reflect.Value.Bytes on string Value", func() { vo("").Bytes() })
4012 shouldPanic("call of reflect.Value.Call on bool Value", func() { vo(true).Call(nil) })
4013 shouldPanic("call of reflect.Value.CallSlice on int Value", func() { vo(0).CallSlice(nil) })
4014 shouldPanic("call of reflect.Value.Close on string Value", func() { vo("").Close() })
4015 shouldPanic("call of reflect.Value.Complex on float64 Value", func() { vo(0.0).Complex() })
4016 shouldPanic("call of reflect.Value.Elem on bool Value", func() { vo(false).Elem() })
4017 shouldPanic("call of reflect.Value.Field on int Value", func() { vo(0).Field(0) })
4018 shouldPanic("call of reflect.Value.Float on string Value", func() { vo("").Float() })
4019 shouldPanic("call of reflect.Value.Index on float64 Value", func() { vo(0.0).Index(0) })
4020 shouldPanic("call of reflect.Value.Int on bool Value", func() { vo(false).Int() })
4021 shouldPanic("call of reflect.Value.IsNil on int Value", func() { vo(0).IsNil() })
4022 shouldPanic("call of reflect.Value.Len on bool Value", func() { vo(false).Len() })
4023 shouldPanic("call of reflect.Value.MapIndex on float64 Value", func() { vo(0.0).MapIndex(vo(0.0)) })
4024 shouldPanic("call of reflect.Value.MapKeys on string Value", func() { vo("").MapKeys() })
4025 shouldPanic("call of reflect.Value.MapRange on int Value", func() { vo(0).MapRange() })
4026 shouldPanic("call of reflect.Value.Method on zero Value", func() { vo(nil).Method(0) })
4027 shouldPanic("call of reflect.Value.NumField on string Value", func() { vo("").NumField() })
4028 shouldPanic("call of reflect.Value.NumMethod on zero Value", func() { vo(nil).NumMethod() })
4029 shouldPanic("call of reflect.Value.OverflowComplex on float64 Value", func() { vo(float64(0)).OverflowComplex(0) })
4030 shouldPanic("call of reflect.Value.OverflowFloat on int64 Value", func() { vo(int64(0)).OverflowFloat(0) })
4031 shouldPanic("call of reflect.Value.OverflowInt on uint64 Value", func() { vo(uint64(0)).OverflowInt(0) })
4032 shouldPanic("call of reflect.Value.OverflowUint on complex64 Value", func() { vo(complex64(0)).OverflowUint(0) })
4033 shouldPanic("call of reflect.Value.Recv on string Value", func() { vo("").Recv() })
4034 shouldPanic("call of reflect.Value.Send on bool Value", func() { vo(true).Send(vo(true)) })
4035 shouldPanic("value of type string is not assignable to type bool", func() { vo(new(bool)).Elem().Set(vo("")) })
4036 shouldPanic("call of reflect.Value.SetBool on string Value", func() { vo(new(string)).Elem().SetBool(false) })
4037 shouldPanic("reflect.Value.SetBytes using unaddressable value", func() { vo("").SetBytes(nil) })
4038 shouldPanic("call of reflect.Value.SetCap on string Value", func() { vo(new(string)).Elem().SetCap(0) })
4039 shouldPanic("call of reflect.Value.SetComplex on string Value", func() { vo(new(string)).Elem().SetComplex(0) })
4040 shouldPanic("call of reflect.Value.SetFloat on string Value", func() { vo(new(string)).Elem().SetFloat(0) })
4041 shouldPanic("call of reflect.Value.SetInt on string Value", func() { vo(new(string)).Elem().SetInt(0) })
4042 shouldPanic("call of reflect.Value.SetLen on string Value", func() { vo(new(string)).Elem().SetLen(0) })
4043 shouldPanic("call of reflect.Value.SetString on int Value", func() { vo(new(int)).Elem().SetString("") })
4044 shouldPanic("reflect.Value.SetUint using unaddressable value", func() { vo(0.0).SetUint(0) })
4045 shouldPanic("call of reflect.Value.Slice on bool Value", func() { vo(true).Slice(1, 2) })
4046 shouldPanic("call of reflect.Value.Slice3 on int Value", func() { vo(0).Slice3(1, 2, 3) })
4047 shouldPanic("call of reflect.Value.TryRecv on bool Value", func() { vo(true).TryRecv() })
4048 shouldPanic("call of reflect.Value.TrySend on string Value", func() { vo("").TrySend(vo("")) })
4049 shouldPanic("call of reflect.Value.Uint on float64 Value", func() { vo(0.0).Uint() })
4052 func shouldPanic(expect string, f func()) {
4056 panic("did not panic")
4060 switch r := r.(type) {
4066 panic(fmt.Sprintf("panicked with unexpected type %T", r))
4068 if !strings.HasPrefix(s, "reflect") {
4069 panic(`panic string does not start with "reflect": ` + s)
4071 if !strings.Contains(s, expect) {
4072 panic(`panic string does not contain "` + expect + `": ` + s)
4079 func isNonNil(x any) {
4081 panic("nil interface")
4085 func isValid(v Value) {
4091 func TestAlias(t *testing.T) {
4092 x := string("hello")
4093 v := ValueOf(&x).Elem()
4094 oldvalue := v.Interface()
4095 v.SetString("world")
4096 newvalue := v.Interface()
4098 if oldvalue != "hello" || newvalue != "world" {
4099 t.Errorf("aliasing: old=%q new=%q, want hello, world", oldvalue, newvalue)
4105 func EmptyInterfaceV(x any) Value {
4106 return ValueOf(&x).Elem()
4109 func ReaderV(x io.Reader) Value {
4110 return ValueOf(&x).Elem()
4113 func ReadWriterV(x io.ReadWriter) Value {
4114 return ValueOf(&x).Elem()
4118 type MyStruct struct {
4121 type MyStruct1 struct {
4126 type MyStruct2 struct {
4131 type MyString string
4133 type MyBytesArrayPtr0 *[0]byte
4134 type MyBytesArrayPtr *[4]byte
4135 type MyBytesArray0 [0]byte
4136 type MyBytesArray [4]byte
4137 type MyRunes []int32
4141 type IntChan chan int
4142 type IntChanRecv <-chan int
4143 type IntChanSend chan<- int
4144 type BytesChan chan []byte
4145 type BytesChanRecv <-chan []byte
4146 type BytesChanSend chan<- []byte
4148 var convertTests = []struct {
4154 Edit .+1,/\*\//-1>cat >/tmp/x.go && go run /tmp/x.go
4160 var numbers = []string{
4161 "int8", "uint8", "int16", "uint16",
4162 "int32", "uint32", "int64", "uint64",
4163 "int", "uint", "uintptr",
4164 "float32", "float64",
4168 // all pairs but in an unusual order,
4169 // to emit all the int8, uint8 cases
4170 // before n grows too big.
4172 for i, f := range numbers {
4173 for _, g := range numbers[i:] {
4174 fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", f, n, g, n)
4177 fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", g, n, f, n)
4184 {V(int8(1)), V(int8(1))},
4185 {V(int8(2)), V(uint8(2))},
4186 {V(uint8(3)), V(int8(3))},
4187 {V(int8(4)), V(int16(4))},
4188 {V(int16(5)), V(int8(5))},
4189 {V(int8(6)), V(uint16(6))},
4190 {V(uint16(7)), V(int8(7))},
4191 {V(int8(8)), V(int32(8))},
4192 {V(int32(9)), V(int8(9))},
4193 {V(int8(10)), V(uint32(10))},
4194 {V(uint32(11)), V(int8(11))},
4195 {V(int8(12)), V(int64(12))},
4196 {V(int64(13)), V(int8(13))},
4197 {V(int8(14)), V(uint64(14))},
4198 {V(uint64(15)), V(int8(15))},
4199 {V(int8(16)), V(int(16))},
4200 {V(int(17)), V(int8(17))},
4201 {V(int8(18)), V(uint(18))},
4202 {V(uint(19)), V(int8(19))},
4203 {V(int8(20)), V(uintptr(20))},
4204 {V(uintptr(21)), V(int8(21))},
4205 {V(int8(22)), V(float32(22))},
4206 {V(float32(23)), V(int8(23))},
4207 {V(int8(24)), V(float64(24))},
4208 {V(float64(25)), V(int8(25))},
4209 {V(uint8(26)), V(uint8(26))},
4210 {V(uint8(27)), V(int16(27))},
4211 {V(int16(28)), V(uint8(28))},
4212 {V(uint8(29)), V(uint16(29))},
4213 {V(uint16(30)), V(uint8(30))},
4214 {V(uint8(31)), V(int32(31))},
4215 {V(int32(32)), V(uint8(32))},
4216 {V(uint8(33)), V(uint32(33))},
4217 {V(uint32(34)), V(uint8(34))},
4218 {V(uint8(35)), V(int64(35))},
4219 {V(int64(36)), V(uint8(36))},
4220 {V(uint8(37)), V(uint64(37))},
4221 {V(uint64(38)), V(uint8(38))},
4222 {V(uint8(39)), V(int(39))},
4223 {V(int(40)), V(uint8(40))},
4224 {V(uint8(41)), V(uint(41))},
4225 {V(uint(42)), V(uint8(42))},
4226 {V(uint8(43)), V(uintptr(43))},
4227 {V(uintptr(44)), V(uint8(44))},
4228 {V(uint8(45)), V(float32(45))},
4229 {V(float32(46)), V(uint8(46))},
4230 {V(uint8(47)), V(float64(47))},
4231 {V(float64(48)), V(uint8(48))},
4232 {V(int16(49)), V(int16(49))},
4233 {V(int16(50)), V(uint16(50))},
4234 {V(uint16(51)), V(int16(51))},
4235 {V(int16(52)), V(int32(52))},
4236 {V(int32(53)), V(int16(53))},
4237 {V(int16(54)), V(uint32(54))},
4238 {V(uint32(55)), V(int16(55))},
4239 {V(int16(56)), V(int64(56))},
4240 {V(int64(57)), V(int16(57))},
4241 {V(int16(58)), V(uint64(58))},
4242 {V(uint64(59)), V(int16(59))},
4243 {V(int16(60)), V(int(60))},
4244 {V(int(61)), V(int16(61))},
4245 {V(int16(62)), V(uint(62))},
4246 {V(uint(63)), V(int16(63))},
4247 {V(int16(64)), V(uintptr(64))},
4248 {V(uintptr(65)), V(int16(65))},
4249 {V(int16(66)), V(float32(66))},
4250 {V(float32(67)), V(int16(67))},
4251 {V(int16(68)), V(float64(68))},
4252 {V(float64(69)), V(int16(69))},
4253 {V(uint16(70)), V(uint16(70))},
4254 {V(uint16(71)), V(int32(71))},
4255 {V(int32(72)), V(uint16(72))},
4256 {V(uint16(73)), V(uint32(73))},
4257 {V(uint32(74)), V(uint16(74))},
4258 {V(uint16(75)), V(int64(75))},
4259 {V(int64(76)), V(uint16(76))},
4260 {V(uint16(77)), V(uint64(77))},
4261 {V(uint64(78)), V(uint16(78))},
4262 {V(uint16(79)), V(int(79))},
4263 {V(int(80)), V(uint16(80))},
4264 {V(uint16(81)), V(uint(81))},
4265 {V(uint(82)), V(uint16(82))},
4266 {V(uint16(83)), V(uintptr(83))},
4267 {V(uintptr(84)), V(uint16(84))},
4268 {V(uint16(85)), V(float32(85))},
4269 {V(float32(86)), V(uint16(86))},
4270 {V(uint16(87)), V(float64(87))},
4271 {V(float64(88)), V(uint16(88))},
4272 {V(int32(89)), V(int32(89))},
4273 {V(int32(90)), V(uint32(90))},
4274 {V(uint32(91)), V(int32(91))},
4275 {V(int32(92)), V(int64(92))},
4276 {V(int64(93)), V(int32(93))},
4277 {V(int32(94)), V(uint64(94))},
4278 {V(uint64(95)), V(int32(95))},
4279 {V(int32(96)), V(int(96))},
4280 {V(int(97)), V(int32(97))},
4281 {V(int32(98)), V(uint(98))},
4282 {V(uint(99)), V(int32(99))},
4283 {V(int32(100)), V(uintptr(100))},
4284 {V(uintptr(101)), V(int32(101))},
4285 {V(int32(102)), V(float32(102))},
4286 {V(float32(103)), V(int32(103))},
4287 {V(int32(104)), V(float64(104))},
4288 {V(float64(105)), V(int32(105))},
4289 {V(uint32(106)), V(uint32(106))},
4290 {V(uint32(107)), V(int64(107))},
4291 {V(int64(108)), V(uint32(108))},
4292 {V(uint32(109)), V(uint64(109))},
4293 {V(uint64(110)), V(uint32(110))},
4294 {V(uint32(111)), V(int(111))},
4295 {V(int(112)), V(uint32(112))},
4296 {V(uint32(113)), V(uint(113))},
4297 {V(uint(114)), V(uint32(114))},
4298 {V(uint32(115)), V(uintptr(115))},
4299 {V(uintptr(116)), V(uint32(116))},
4300 {V(uint32(117)), V(float32(117))},
4301 {V(float32(118)), V(uint32(118))},
4302 {V(uint32(119)), V(float64(119))},
4303 {V(float64(120)), V(uint32(120))},
4304 {V(int64(121)), V(int64(121))},
4305 {V(int64(122)), V(uint64(122))},
4306 {V(uint64(123)), V(int64(123))},
4307 {V(int64(124)), V(int(124))},
4308 {V(int(125)), V(int64(125))},
4309 {V(int64(126)), V(uint(126))},
4310 {V(uint(127)), V(int64(127))},
4311 {V(int64(128)), V(uintptr(128))},
4312 {V(uintptr(129)), V(int64(129))},
4313 {V(int64(130)), V(float32(130))},
4314 {V(float32(131)), V(int64(131))},
4315 {V(int64(132)), V(float64(132))},
4316 {V(float64(133)), V(int64(133))},
4317 {V(uint64(134)), V(uint64(134))},
4318 {V(uint64(135)), V(int(135))},
4319 {V(int(136)), V(uint64(136))},
4320 {V(uint64(137)), V(uint(137))},
4321 {V(uint(138)), V(uint64(138))},
4322 {V(uint64(139)), V(uintptr(139))},
4323 {V(uintptr(140)), V(uint64(140))},
4324 {V(uint64(141)), V(float32(141))},
4325 {V(float32(142)), V(uint64(142))},
4326 {V(uint64(143)), V(float64(143))},
4327 {V(float64(144)), V(uint64(144))},
4328 {V(int(145)), V(int(145))},
4329 {V(int(146)), V(uint(146))},
4330 {V(uint(147)), V(int(147))},
4331 {V(int(148)), V(uintptr(148))},
4332 {V(uintptr(149)), V(int(149))},
4333 {V(int(150)), V(float32(150))},
4334 {V(float32(151)), V(int(151))},
4335 {V(int(152)), V(float64(152))},
4336 {V(float64(153)), V(int(153))},
4337 {V(uint(154)), V(uint(154))},
4338 {V(uint(155)), V(uintptr(155))},
4339 {V(uintptr(156)), V(uint(156))},
4340 {V(uint(157)), V(float32(157))},
4341 {V(float32(158)), V(uint(158))},
4342 {V(uint(159)), V(float64(159))},
4343 {V(float64(160)), V(uint(160))},
4344 {V(uintptr(161)), V(uintptr(161))},
4345 {V(uintptr(162)), V(float32(162))},
4346 {V(float32(163)), V(uintptr(163))},
4347 {V(uintptr(164)), V(float64(164))},
4348 {V(float64(165)), V(uintptr(165))},
4349 {V(float32(166)), V(float32(166))},
4350 {V(float32(167)), V(float64(167))},
4351 {V(float64(168)), V(float32(168))},
4352 {V(float64(169)), V(float64(169))},
4355 {V(float64(1.5)), V(int(1))},
4358 {V(complex64(1i)), V(complex64(1i))},
4359 {V(complex64(2i)), V(complex128(2i))},
4360 {V(complex128(3i)), V(complex64(3i))},
4361 {V(complex128(4i)), V(complex128(4i))},
4364 {V(string("hello")), V(string("hello"))},
4365 {V(string("bytes1")), V([]byte("bytes1"))},
4366 {V([]byte("bytes2")), V(string("bytes2"))},
4367 {V([]byte("bytes3")), V([]byte("bytes3"))},
4368 {V(string("runes♝")), V([]rune("runes♝"))},
4369 {V([]rune("runes♕")), V(string("runes♕"))},
4370 {V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
4371 {V(int('a')), V(string("a"))},
4372 {V(int8('a')), V(string("a"))},
4373 {V(int16('a')), V(string("a"))},
4374 {V(int32('a')), V(string("a"))},
4375 {V(int64('a')), V(string("a"))},
4376 {V(uint('a')), V(string("a"))},
4377 {V(uint8('a')), V(string("a"))},
4378 {V(uint16('a')), V(string("a"))},
4379 {V(uint32('a')), V(string("a"))},
4380 {V(uint64('a')), V(string("a"))},
4381 {V(uintptr('a')), V(string("a"))},
4382 {V(int(-1)), V(string("\uFFFD"))},
4383 {V(int8(-2)), V(string("\uFFFD"))},
4384 {V(int16(-3)), V(string("\uFFFD"))},
4385 {V(int32(-4)), V(string("\uFFFD"))},
4386 {V(int64(-5)), V(string("\uFFFD"))},
4387 {V(int64(-1 << 32)), V(string("\uFFFD"))},
4388 {V(int64(1 << 32)), V(string("\uFFFD"))},
4389 {V(uint(0x110001)), V(string("\uFFFD"))},
4390 {V(uint32(0x110002)), V(string("\uFFFD"))},
4391 {V(uint64(0x110003)), V(string("\uFFFD"))},
4392 {V(uint64(1 << 32)), V(string("\uFFFD"))},
4393 {V(uintptr(0x110004)), V(string("\uFFFD"))},
4396 {V(MyString("hello")), V(string("hello"))},
4397 {V(string("hello")), V(MyString("hello"))},
4398 {V(string("hello")), V(string("hello"))},
4399 {V(MyString("hello")), V(MyString("hello"))},
4400 {V(MyString("bytes1")), V([]byte("bytes1"))},
4401 {V([]byte("bytes2")), V(MyString("bytes2"))},
4402 {V([]byte("bytes3")), V([]byte("bytes3"))},
4403 {V(MyString("runes♝")), V([]rune("runes♝"))},
4404 {V([]rune("runes♕")), V(MyString("runes♕"))},
4405 {V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
4406 {V([]rune("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))},
4407 {V(MyRunes("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
4408 {V(int('a')), V(MyString("a"))},
4409 {V(int8('a')), V(MyString("a"))},
4410 {V(int16('a')), V(MyString("a"))},
4411 {V(int32('a')), V(MyString("a"))},
4412 {V(int64('a')), V(MyString("a"))},
4413 {V(uint('a')), V(MyString("a"))},
4414 {V(uint8('a')), V(MyString("a"))},
4415 {V(uint16('a')), V(MyString("a"))},
4416 {V(uint32('a')), V(MyString("a"))},
4417 {V(uint64('a')), V(MyString("a"))},
4418 {V(uintptr('a')), V(MyString("a"))},
4419 {V(int(-1)), V(MyString("\uFFFD"))},
4420 {V(int8(-2)), V(MyString("\uFFFD"))},
4421 {V(int16(-3)), V(MyString("\uFFFD"))},
4422 {V(int32(-4)), V(MyString("\uFFFD"))},
4423 {V(int64(-5)), V(MyString("\uFFFD"))},
4424 {V(uint(0x110001)), V(MyString("\uFFFD"))},
4425 {V(uint32(0x110002)), V(MyString("\uFFFD"))},
4426 {V(uint64(0x110003)), V(MyString("\uFFFD"))},
4427 {V(uintptr(0x110004)), V(MyString("\uFFFD"))},
4430 {V(string("bytes1")), V(MyBytes("bytes1"))},
4431 {V(MyBytes("bytes2")), V(string("bytes2"))},
4432 {V(MyBytes("bytes3")), V(MyBytes("bytes3"))},
4433 {V(MyString("bytes1")), V(MyBytes("bytes1"))},
4434 {V(MyBytes("bytes2")), V(MyString("bytes2"))},
4437 {V(string("runes♝")), V(MyRunes("runes♝"))},
4438 {V(MyRunes("runes♕")), V(string("runes♕"))},
4439 {V(MyRunes("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))},
4440 {V(MyString("runes♝")), V(MyRunes("runes♝"))},
4441 {V(MyRunes("runes♕")), V(MyString("runes♕"))},
4444 {V([]byte(nil)), V([0]byte{})},
4445 {V([]byte{}), V([0]byte{})},
4446 {V([]byte{1}), V([1]byte{1})},
4447 {V([]byte{1, 2}), V([2]byte{1, 2})},
4448 {V([]byte{1, 2, 3}), V([3]byte{1, 2, 3})},
4449 {V(MyBytes([]byte(nil))), V([0]byte{})},
4450 {V(MyBytes{}), V([0]byte{})},
4451 {V(MyBytes{1}), V([1]byte{1})},
4452 {V(MyBytes{1, 2}), V([2]byte{1, 2})},
4453 {V(MyBytes{1, 2, 3}), V([3]byte{1, 2, 3})},
4454 {V([]byte(nil)), V(MyBytesArray0{})},
4455 {V([]byte{}), V(MyBytesArray0([0]byte{}))},
4456 {V([]byte{1, 2, 3, 4}), V(MyBytesArray([4]byte{1, 2, 3, 4}))},
4457 {V(MyBytes{}), V(MyBytesArray0([0]byte{}))},
4458 {V(MyBytes{5, 6, 7, 8}), V(MyBytesArray([4]byte{5, 6, 7, 8}))},
4459 {V([]MyByte{}), V([0]MyByte{})},
4460 {V([]MyByte{1, 2}), V([2]MyByte{1, 2})},
4462 // slice to array pointer
4463 {V([]byte(nil)), V((*[0]byte)(nil))},
4464 {V([]byte{}), V(new([0]byte))},
4465 {V([]byte{7}), V(&[1]byte{7})},
4466 {V(MyBytes([]byte(nil))), V((*[0]byte)(nil))},
4467 {V(MyBytes([]byte{})), V(new([0]byte))},
4468 {V(MyBytes([]byte{9})), V(&[1]byte{9})},
4469 {V([]byte(nil)), V(MyBytesArrayPtr0(nil))},
4470 {V([]byte{}), V(MyBytesArrayPtr0(new([0]byte)))},
4471 {V([]byte{1, 2, 3, 4}), V(MyBytesArrayPtr(&[4]byte{1, 2, 3, 4}))},
4472 {V(MyBytes([]byte{})), V(MyBytesArrayPtr0(new([0]byte)))},
4473 {V(MyBytes([]byte{5, 6, 7, 8})), V(MyBytesArrayPtr(&[4]byte{5, 6, 7, 8}))},
4475 {V([]byte(nil)), V((*MyBytesArray0)(nil))},
4476 {V([]byte{}), V((*MyBytesArray0)(new([0]byte)))},
4477 {V([]byte{1, 2, 3, 4}), V(&MyBytesArray{1, 2, 3, 4})},
4478 {V(MyBytes([]byte(nil))), V((*MyBytesArray0)(nil))},
4479 {V(MyBytes([]byte{})), V((*MyBytesArray0)(new([0]byte)))},
4480 {V(MyBytes([]byte{5, 6, 7, 8})), V(&MyBytesArray{5, 6, 7, 8})},
4481 {V(new([0]byte)), V(new(MyBytesArray0))},
4482 {V(new(MyBytesArray0)), V(new([0]byte))},
4483 {V(MyBytesArrayPtr0(nil)), V((*[0]byte)(nil))},
4484 {V((*[0]byte)(nil)), V(MyBytesArrayPtr0(nil))},
4486 // named types and equal underlying types
4487 {V(new(int)), V(new(integer))},
4488 {V(new(integer)), V(new(int))},
4489 {V(Empty{}), V(struct{}{})},
4490 {V(new(Empty)), V(new(struct{}))},
4491 {V(struct{}{}), V(Empty{})},
4492 {V(new(struct{})), V(new(Empty))},
4493 {V(Empty{}), V(Empty{})},
4494 {V(MyBytes{}), V([]byte{})},
4495 {V([]byte{}), V(MyBytes{})},
4496 {V((func())(nil)), V(MyFunc(nil))},
4497 {V((MyFunc)(nil)), V((func())(nil))},
4499 // structs with different tags
4512 {V(MyStruct{}), V(struct {
4518 }{}), V(MyStruct{})},
4520 {V(MyStruct{}), V(struct {
4526 }{}), V(MyStruct{})},
4528 {V(MyStruct1{}), V(MyStruct2{})},
4529 {V(MyStruct2{}), V(MyStruct1{})},
4531 // can convert *byte and *MyByte
4532 {V((*byte)(nil)), V((*MyByte)(nil))},
4533 {V((*MyByte)(nil)), V((*byte)(nil))},
4535 // cannot convert mismatched array sizes
4536 {V([2]byte{}), V([2]byte{})},
4537 {V([3]byte{}), V([3]byte{})},
4538 {V(MyBytesArray0{}), V([0]byte{})},
4539 {V([0]byte{}), V(MyBytesArray0{})},
4541 // cannot convert other instances
4542 {V((**byte)(nil)), V((**byte)(nil))},
4543 {V((**MyByte)(nil)), V((**MyByte)(nil))},
4544 {V((chan byte)(nil)), V((chan byte)(nil))},
4545 {V((chan MyByte)(nil)), V((chan MyByte)(nil))},
4546 {V(([]byte)(nil)), V(([]byte)(nil))},
4547 {V(([]MyByte)(nil)), V(([]MyByte)(nil))},
4548 {V((map[int]byte)(nil)), V((map[int]byte)(nil))},
4549 {V((map[int]MyByte)(nil)), V((map[int]MyByte)(nil))},
4550 {V((map[byte]int)(nil)), V((map[byte]int)(nil))},
4551 {V((map[MyByte]int)(nil)), V((map[MyByte]int)(nil))},
4552 {V([2]byte{}), V([2]byte{})},
4553 {V([2]MyByte{}), V([2]MyByte{})},
4556 {V((***int)(nil)), V((***int)(nil))},
4557 {V((***byte)(nil)), V((***byte)(nil))},
4558 {V((***int32)(nil)), V((***int32)(nil))},
4559 {V((***int64)(nil)), V((***int64)(nil))},
4560 {V((chan byte)(nil)), V((chan byte)(nil))},
4561 {V((chan MyByte)(nil)), V((chan MyByte)(nil))},
4562 {V((map[int]bool)(nil)), V((map[int]bool)(nil))},
4563 {V((map[int]byte)(nil)), V((map[int]byte)(nil))},
4564 {V((map[uint]bool)(nil)), V((map[uint]bool)(nil))},
4565 {V([]uint(nil)), V([]uint(nil))},
4566 {V([]int(nil)), V([]int(nil))},
4567 {V(new(any)), V(new(any))},
4568 {V(new(io.Reader)), V(new(io.Reader))},
4569 {V(new(io.Writer)), V(new(io.Writer))},
4572 {V(IntChan(nil)), V((chan<- int)(nil))},
4573 {V(IntChan(nil)), V((<-chan int)(nil))},
4574 {V((chan int)(nil)), V(IntChanRecv(nil))},
4575 {V((chan int)(nil)), V(IntChanSend(nil))},
4576 {V(IntChanRecv(nil)), V((<-chan int)(nil))},
4577 {V((<-chan int)(nil)), V(IntChanRecv(nil))},
4578 {V(IntChanSend(nil)), V((chan<- int)(nil))},
4579 {V((chan<- int)(nil)), V(IntChanSend(nil))},
4580 {V(IntChan(nil)), V((chan int)(nil))},
4581 {V((chan int)(nil)), V(IntChan(nil))},
4582 {V((chan int)(nil)), V((<-chan int)(nil))},
4583 {V((chan int)(nil)), V((chan<- int)(nil))},
4584 {V(BytesChan(nil)), V((chan<- []byte)(nil))},
4585 {V(BytesChan(nil)), V((<-chan []byte)(nil))},
4586 {V((chan []byte)(nil)), V(BytesChanRecv(nil))},
4587 {V((chan []byte)(nil)), V(BytesChanSend(nil))},
4588 {V(BytesChanRecv(nil)), V((<-chan []byte)(nil))},
4589 {V((<-chan []byte)(nil)), V(BytesChanRecv(nil))},
4590 {V(BytesChanSend(nil)), V((chan<- []byte)(nil))},
4591 {V((chan<- []byte)(nil)), V(BytesChanSend(nil))},
4592 {V(BytesChan(nil)), V((chan []byte)(nil))},
4593 {V((chan []byte)(nil)), V(BytesChan(nil))},
4594 {V((chan []byte)(nil)), V((<-chan []byte)(nil))},
4595 {V((chan []byte)(nil)), V((chan<- []byte)(nil))},
4597 // cannot convert other instances (channels)
4598 {V(IntChan(nil)), V(IntChan(nil))},
4599 {V(IntChanRecv(nil)), V(IntChanRecv(nil))},
4600 {V(IntChanSend(nil)), V(IntChanSend(nil))},
4601 {V(BytesChan(nil)), V(BytesChan(nil))},
4602 {V(BytesChanRecv(nil)), V(BytesChanRecv(nil))},
4603 {V(BytesChanSend(nil)), V(BytesChanSend(nil))},
4606 {V(int(1)), EmptyInterfaceV(int(1))},
4607 {V(string("hello")), EmptyInterfaceV(string("hello"))},
4608 {V(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))},
4609 {ReadWriterV(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))},
4610 {V(new(bytes.Buffer)), ReadWriterV(new(bytes.Buffer))},
4613 func TestConvert(t *testing.T) {
4614 canConvert := map[[2]Type]bool{}
4615 all := map[Type]bool{}
4617 for _, tt := range convertTests {
4619 if !t1.ConvertibleTo(t1) {
4620 t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t1)
4625 if !t1.ConvertibleTo(t2) {
4626 t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t2)
4632 canConvert[[2]Type{t1, t2}] = true
4634 // vout1 represents the in value converted to the in type.
4636 if !v1.CanConvert(t1) {
4637 t.Errorf("ValueOf(%T(%[1]v)).CanConvert(%s) = false, want true", tt.in.Interface(), t1)
4639 vout1 := v1.Convert(t1)
4640 out1 := vout1.Interface()
4641 if vout1.Type() != tt.in.Type() || !DeepEqual(out1, tt.in.Interface()) {
4642 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t1, out1, tt.in.Interface())
4645 // vout2 represents the in value converted to the out type.
4646 if !v1.CanConvert(t2) {
4647 t.Errorf("ValueOf(%T(%[1]v)).CanConvert(%s) = false, want true", tt.in.Interface(), t2)
4649 vout2 := v1.Convert(t2)
4650 out2 := vout2.Interface()
4651 if vout2.Type() != tt.out.Type() || !DeepEqual(out2, tt.out.Interface()) {
4652 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out2, tt.out.Interface())
4654 if got, want := vout2.Kind(), vout2.Type().Kind(); got != want {
4655 t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) has internal kind %v want %v", tt.in.Interface(), t1, got, want)
4658 // vout3 represents a new value of the out type, set to vout2. This makes
4659 // sure the converted value vout2 is really usable as a regular value.
4660 vout3 := New(t2).Elem()
4662 out3 := vout3.Interface()
4663 if vout3.Type() != tt.out.Type() || !DeepEqual(out3, tt.out.Interface()) {
4664 t.Errorf("Set(ValueOf(%T(%[1]v)).Convert(%s)) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out3, tt.out.Interface())
4668 t.Errorf("table entry %v is RO, should not be", v1)
4671 t.Errorf("self-conversion output %v is RO, should not be", vout1)
4674 t.Errorf("conversion output %v is RO, should not be", vout2)
4677 t.Errorf("set(conversion output) %v is RO, should not be", vout3)
4679 if !IsRO(MakeRO(v1).Convert(t1)) {
4680 t.Errorf("RO self-conversion output %v is not RO, should be", v1)
4682 if !IsRO(MakeRO(v1).Convert(t2)) {
4683 t.Errorf("RO conversion output %v is not RO, should be", v1)
4687 // Assume that of all the types we saw during the tests,
4688 // if there wasn't an explicit entry for a conversion between
4689 // a pair of types, then it's not to be allowed. This checks for
4690 // things like 'int64' converting to '*int'.
4691 for t1 := range all {
4692 for t2 := range all {
4693 expectOK := t1 == t2 || canConvert[[2]Type{t1, t2}] || t2.Kind() == Interface && t2.NumMethod() == 0
4694 if ok := t1.ConvertibleTo(t2); ok != expectOK {
4695 t.Errorf("(%s).ConvertibleTo(%s) = %v, want %v", t1, t2, ok, expectOK)
4701 func TestConvertPanic(t *testing.T) {
4702 s := make([]byte, 4)
4706 if !v.Type().ConvertibleTo(pt) {
4707 t.Errorf("[]byte should be convertible to *[8]byte")
4709 if v.CanConvert(pt) {
4710 t.Errorf("slice with length 4 should not be convertible to *[8]byte")
4712 shouldPanic("reflect: cannot convert slice with length 4 to pointer to array with length 8", func() {
4716 if v.CanConvert(pt.Elem()) {
4717 t.Errorf("slice with length 4 should not be convertible to [8]byte")
4719 shouldPanic("reflect: cannot convert slice with length 4 to array with length 8", func() {
4720 _ = v.Convert(pt.Elem())
4724 func TestConvertSlice2Array(t *testing.T) {
4730 // Converting a slice to non-empty array needs to return
4731 // a non-addressable copy of the original memory.
4733 t.Fatalf("convert slice to non-empty array returns a addressable copy array")
4736 ov.Index(i).Set(ValueOf(i + 1))
4739 if v.Index(i).Int() != 0 {
4740 t.Fatalf("slice (%v) mutation visible in converted result (%v)", ov, v)
4745 var gFloat32 float32
4747 const snan uint32 = 0x7f800001
4749 func TestConvertNaNs(t *testing.T) {
4750 // Test to see if a store followed by a load of a signaling NaN
4751 // maintains the signaling bit. (This used to fail on the 387 port.)
4752 gFloat32 = math.Float32frombits(snan)
4753 runtime.Gosched() // make sure we don't optimize the store/load away
4754 if got := math.Float32bits(gFloat32); got != snan {
4755 t.Errorf("store/load of sNaN not faithful, got %x want %x", got, snan)
4757 // Test reflect's conversion between float32s. See issue 36400.
4758 type myFloat32 float32
4759 x := V(myFloat32(math.Float32frombits(snan)))
4760 y := x.Convert(TypeOf(float32(0)))
4761 z := y.Interface().(float32)
4762 if got := math.Float32bits(z); got != snan {
4763 t.Errorf("signaling nan conversion got %x, want %x", got, snan)
4767 type ComparableStruct struct {
4771 type NonComparableStruct struct {
4776 var comparableTests = []struct {
4781 {TypeOf("hello"), true},
4782 {TypeOf(new(byte)), true},
4783 {TypeOf((func())(nil)), false},
4784 {TypeOf([]byte{}), false},
4785 {TypeOf(map[string]int{}), false},
4786 {TypeOf(make(chan int)), true},
4787 {TypeOf(1.5), true},
4788 {TypeOf(false), true},
4790 {TypeOf(ComparableStruct{}), true},
4791 {TypeOf(NonComparableStruct{}), false},
4792 {TypeOf([10]map[string]int{}), false},
4793 {TypeOf([10]string{}), true},
4794 {TypeOf(new(any)).Elem(), true},
4797 func TestComparable(t *testing.T) {
4798 for _, tt := range comparableTests {
4799 if ok := tt.typ.Comparable(); ok != tt.ok {
4800 t.Errorf("TypeOf(%v).Comparable() = %v, want %v", tt.typ, ok, tt.ok)
4805 func TestOverflow(t *testing.T) {
4806 if ovf := V(float64(0)).OverflowFloat(1e300); ovf {
4807 t.Errorf("%v wrongly overflows float64", 1e300)
4810 maxFloat32 := float64((1<<24 - 1) << (127 - 23))
4811 if ovf := V(float32(0)).OverflowFloat(maxFloat32); ovf {
4812 t.Errorf("%v wrongly overflows float32", maxFloat32)
4814 ovfFloat32 := float64((1<<24-1)<<(127-23) + 1<<(127-52))
4815 if ovf := V(float32(0)).OverflowFloat(ovfFloat32); !ovf {
4816 t.Errorf("%v should overflow float32", ovfFloat32)
4818 if ovf := V(float32(0)).OverflowFloat(-ovfFloat32); !ovf {
4819 t.Errorf("%v should overflow float32", -ovfFloat32)
4822 maxInt32 := int64(0x7fffffff)
4823 if ovf := V(int32(0)).OverflowInt(maxInt32); ovf {
4824 t.Errorf("%v wrongly overflows int32", maxInt32)
4826 if ovf := V(int32(0)).OverflowInt(-1 << 31); ovf {
4827 t.Errorf("%v wrongly overflows int32", -int64(1)<<31)
4829 ovfInt32 := int64(1 << 31)
4830 if ovf := V(int32(0)).OverflowInt(ovfInt32); !ovf {
4831 t.Errorf("%v should overflow int32", ovfInt32)
4834 maxUint32 := uint64(0xffffffff)
4835 if ovf := V(uint32(0)).OverflowUint(maxUint32); ovf {
4836 t.Errorf("%v wrongly overflows uint32", maxUint32)
4838 ovfUint32 := uint64(1 << 32)
4839 if ovf := V(uint32(0)).OverflowUint(ovfUint32); !ovf {
4840 t.Errorf("%v should overflow uint32", ovfUint32)
4844 func checkSameType(t *testing.T, x Type, y any) {
4845 if x != TypeOf(y) || TypeOf(Zero(x).Interface()) != TypeOf(y) {
4846 t.Errorf("did not find preexisting type for %s (vs %s)", TypeOf(x), TypeOf(y))
4850 func TestArrayOf(t *testing.T) {
4851 // check construction and use of type not in binary
4854 value func(i int) any
4860 value: func(i int) any { type Tint int; return Tint(i) },
4866 value: func(i int) any { type Tint int; return Tint(i) },
4868 want: "[0 1 2 3 4 5 6 7 8 9]",
4872 value: func(i int) any { type Tfloat float64; return Tfloat(i) },
4874 want: "[0 1 2 3 4 5 6 7 8 9]",
4878 value: func(i int) any { type Tstring string; return Tstring(strconv.Itoa(i)) },
4880 want: "[0 1 2 3 4 5 6 7 8 9]",
4884 value: func(i int) any { type Tstruct struct{ V int }; return Tstruct{i} },
4886 want: "[{0} {1} {2} {3} {4} {5} {6} {7} {8} {9}]",
4890 value: func(i int) any { type Tint int; return []Tint{Tint(i)} },
4892 want: "[[0] [1] [2] [3] [4] [5] [6] [7] [8] [9]]",
4896 value: func(i int) any { type Tint int; return [1]Tint{Tint(i)} },
4898 want: "[[0] [1] [2] [3] [4] [5] [6] [7] [8] [9]]",
4902 value: func(i int) any { type Tstruct struct{ V [1]int }; return Tstruct{[1]int{i}} },
4904 want: "[{[0]} {[1]} {[2]} {[3]} {[4]} {[5]} {[6]} {[7]} {[8]} {[9]}]",
4908 value: func(i int) any { type Tstruct struct{ V []int }; return Tstruct{[]int{i}} },
4910 want: "[{[0]} {[1]} {[2]} {[3]} {[4]} {[5]} {[6]} {[7]} {[8]} {[9]}]",
4914 value: func(i int) any { type TstructUV struct{ U, V int }; return TstructUV{i, i} },
4916 want: "[{0 0} {1 1} {2 2} {3 3} {4 4} {5 5} {6 6} {7 7} {8 8} {9 9}]",
4920 value: func(i int) any {
4921 type TstructUV struct {
4925 return TstructUV{i, float64(i)}
4928 want: "[{0 0} {1 1} {2 2} {3 3} {4 4} {5 5} {6 6} {7 7} {8 8} {9 9}]",
4932 for _, table := range tests {
4933 at := ArrayOf(table.n, TypeOf(table.value(0)))
4935 vok := New(at).Elem()
4936 vnot := New(at).Elem()
4937 for i := 0; i < v.Len(); i++ {
4938 v.Index(i).Set(ValueOf(table.value(i)))
4939 vok.Index(i).Set(ValueOf(table.value(i)))
4944 vnot.Index(i).Set(ValueOf(table.value(j))) // make it differ only by last element
4946 s := fmt.Sprint(v.Interface())
4947 if s != table.want {
4948 t.Errorf("constructed array = %s, want %s", s, table.want)
4951 if table.comparable != at.Comparable() {
4952 t.Errorf("constructed array (%#v) is comparable=%v, want=%v", v.Interface(), at.Comparable(), table.comparable)
4954 if table.comparable {
4956 if DeepEqual(vnot.Interface(), v.Interface()) {
4958 "arrays (%#v) compare ok (but should not)",
4963 if !DeepEqual(vok.Interface(), v.Interface()) {
4965 "arrays (%#v) compare NOT-ok (but should)",
4972 // check that type already in binary is found
4974 checkSameType(t, ArrayOf(5, TypeOf(T(1))), [5]T{})
4977 func TestArrayOfGC(t *testing.T) {
4979 tt := TypeOf(T(nil))
4982 for i := 0; i < n; i++ {
4983 v := New(ArrayOf(n, tt)).Elem()
4984 for j := 0; j < v.Len(); j++ {
4986 *p = uintptr(i*n + j)
4987 v.Index(j).Set(ValueOf(p).Convert(tt))
4989 x = append(x, v.Interface())
4993 for i, xi := range x {
4995 for j := 0; j < v.Len(); j++ {
4996 k := v.Index(j).Elem().Interface()
4997 if k != uintptr(i*n+j) {
4998 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j)
5004 func TestArrayOfAlg(t *testing.T) {
5005 at := ArrayOf(6, TypeOf(byte(0)))
5006 v1 := New(at).Elem()
5007 v2 := New(at).Elem()
5008 if v1.Interface() != v1.Interface() {
5009 t.Errorf("constructed array %v not equal to itself", v1.Interface())
5011 v1.Index(5).Set(ValueOf(byte(1)))
5012 if i1, i2 := v1.Interface(), v2.Interface(); i1 == i2 {
5013 t.Errorf("constructed arrays %v and %v should not be equal", i1, i2)
5016 at = ArrayOf(6, TypeOf([]int(nil)))
5018 shouldPanic("", func() { _ = v1.Interface() == v1.Interface() })
5021 func TestArrayOfGenericAlg(t *testing.T) {
5022 at1 := ArrayOf(5, TypeOf(string("")))
5023 at := ArrayOf(6, at1)
5024 v1 := New(at).Elem()
5025 v2 := New(at).Elem()
5026 if v1.Interface() != v1.Interface() {
5027 t.Errorf("constructed array %v not equal to itself", v1.Interface())
5030 v1.Index(0).Index(0).Set(ValueOf("abc"))
5031 v2.Index(0).Index(0).Set(ValueOf("efg"))
5032 if i1, i2 := v1.Interface(), v2.Interface(); i1 == i2 {
5033 t.Errorf("constructed arrays %v and %v should not be equal", i1, i2)
5036 v1.Index(0).Index(0).Set(ValueOf("abc"))
5037 v2.Index(0).Index(0).Set(ValueOf((v1.Index(0).Index(0).String() + " ")[:3]))
5038 if i1, i2 := v1.Interface(), v2.Interface(); i1 != i2 {
5039 t.Errorf("constructed arrays %v and %v should be equal", i1, i2)
5043 m := MakeMap(MapOf(at, TypeOf(int(0))))
5044 m.SetMapIndex(v1, ValueOf(1))
5045 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() {
5046 t.Errorf("constructed arrays %v and %v have different hashes", i1, i2)
5050 func TestArrayOfDirectIface(t *testing.T) {
5053 i1 := Zero(TypeOf(T{})).Interface()
5054 v1 := ValueOf(&i1).Elem()
5055 p1 := v1.InterfaceData()[1]
5057 i2 := Zero(ArrayOf(1, PointerTo(TypeOf(int8(0))))).Interface()
5058 v2 := ValueOf(&i2).Elem()
5059 p2 := v2.InterfaceData()[1]
5062 t.Errorf("got p1=%v. want=%v", p1, nil)
5066 t.Errorf("got p2=%v. want=%v", p2, nil)
5071 i1 := Zero(TypeOf(T{})).Interface()
5072 v1 := ValueOf(&i1).Elem()
5073 p1 := v1.InterfaceData()[1]
5075 i2 := Zero(ArrayOf(0, PointerTo(TypeOf(int8(0))))).Interface()
5076 v2 := ValueOf(&i2).Elem()
5077 p2 := v2.InterfaceData()[1]
5080 t.Errorf("got p1=%v. want=not-%v", p1, nil)
5084 t.Errorf("got p2=%v. want=not-%v", p2, nil)
5089 // Ensure passing in negative lengths panics.
5090 // See https://golang.org/issue/43603
5091 func TestArrayOfPanicOnNegativeLength(t *testing.T) {
5092 shouldPanic("reflect: negative length passed to ArrayOf", func() {
5093 ArrayOf(-1, TypeOf(byte(0)))
5097 func TestSliceOf(t *testing.T) {
5098 // check construction and use of type not in binary
5100 st := SliceOf(TypeOf(T(1)))
5101 if got, want := st.String(), "[]reflect_test.T"; got != want {
5102 t.Errorf("SliceOf(T(1)).String()=%q, want %q", got, want)
5104 v := MakeSlice(st, 10, 10)
5106 for i := 0; i < v.Len(); i++ {
5107 v.Index(i).Set(ValueOf(T(i)))
5110 s := fmt.Sprint(v.Interface())
5111 want := "[0 1 2 3 4 5 6 7 8 9]"
5113 t.Errorf("constructed slice = %s, want %s", s, want)
5116 // check that type already in binary is found
5118 checkSameType(t, SliceOf(TypeOf(T1(1))), []T1{})
5121 func TestSliceOverflow(t *testing.T) {
5122 // check that MakeSlice panics when size of slice overflows uint
5125 l := (1<<(unsafe.Sizeof((*byte)(nil))*8)-1)/s + 1
5127 t.Fatal("slice size does not overflow")
5130 st := SliceOf(TypeOf(x))
5134 t.Fatal("slice overflow does not panic")
5137 MakeSlice(st, int(l), int(l))
5140 func TestSliceOfGC(t *testing.T) {
5142 tt := TypeOf(T(nil))
5146 for i := 0; i < n; i++ {
5147 v := MakeSlice(st, n, n)
5148 for j := 0; j < v.Len(); j++ {
5150 *p = uintptr(i*n + j)
5151 v.Index(j).Set(ValueOf(p).Convert(tt))
5153 x = append(x, v.Interface())
5157 for i, xi := range x {
5159 for j := 0; j < v.Len(); j++ {
5160 k := v.Index(j).Elem().Interface()
5161 if k != uintptr(i*n+j) {
5162 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j)
5168 func TestStructOfFieldName(t *testing.T) {
5169 // invalid field name "1nvalid"
5170 shouldPanic("has invalid name", func() {
5171 StructOf([]StructField{
5172 {Name: "Valid", Type: TypeOf("")},
5173 {Name: "1nvalid", Type: TypeOf("")},
5177 // invalid field name "+"
5178 shouldPanic("has invalid name", func() {
5179 StructOf([]StructField{
5180 {Name: "Val1d", Type: TypeOf("")},
5181 {Name: "+", Type: TypeOf("")},
5186 shouldPanic("has no name", func() {
5187 StructOf([]StructField{
5188 {Name: "", Type: TypeOf("")},
5192 // verify creation of a struct with valid struct fields
5193 validFields := []StructField{
5208 validStruct := StructOf(validFields)
5210 const structStr = `struct { φ string; ValidName string; Val1dNam5 string }`
5211 if got, want := validStruct.String(), structStr; got != want {
5212 t.Errorf("StructOf(validFields).String()=%q, want %q", got, want)
5216 func TestStructOf(t *testing.T) {
5217 // check construction and use of type not in binary
5218 fields := []StructField{
5227 Type: TypeOf(byte(0)),
5231 Type: TypeOf(uint64(0)),
5235 Type: TypeOf([3]uint16{}),
5239 st := StructOf(fields)
5242 v.FieldByName("X").Set(ValueOf(byte(2)))
5243 v.FieldByIndex([]int{1}).Set(ValueOf(byte(1)))
5246 s := fmt.Sprint(v.Interface())
5247 want := `{ 1 0 [0 0 0]}`
5249 t.Errorf("constructed struct = %s, want %s", s, want)
5251 const stStr = `struct { S string "s"; X uint8 "x"; Y uint64; Z [3]uint16 }`
5252 if got, want := st.String(), stStr; got != want {
5253 t.Errorf("StructOf(fields).String()=%q, want %q", got, want)
5256 // check the size, alignment and field offsets
5257 stt := TypeOf(struct {
5263 if st.Size() != stt.Size() {
5264 t.Errorf("constructed struct size = %v, want %v", st.Size(), stt.Size())
5266 if st.Align() != stt.Align() {
5267 t.Errorf("constructed struct align = %v, want %v", st.Align(), stt.Align())
5269 if st.FieldAlign() != stt.FieldAlign() {
5270 t.Errorf("constructed struct field align = %v, want %v", st.FieldAlign(), stt.FieldAlign())
5272 for i := 0; i < st.NumField(); i++ {
5273 o1 := st.Field(i).Offset
5274 o2 := stt.Field(i).Offset
5276 t.Errorf("constructed struct field %v offset = %v, want %v", i, o1, o2)
5280 // Check size and alignment with a trailing zero-sized field.
5281 st = StructOf([]StructField{
5284 Type: TypeOf(byte(0)),
5288 Type: TypeOf([0]*byte{}),
5291 stt = TypeOf(struct {
5295 if st.Size() != stt.Size() {
5296 t.Errorf("constructed zero-padded struct size = %v, want %v", st.Size(), stt.Size())
5298 if st.Align() != stt.Align() {
5299 t.Errorf("constructed zero-padded struct align = %v, want %v", st.Align(), stt.Align())
5301 if st.FieldAlign() != stt.FieldAlign() {
5302 t.Errorf("constructed zero-padded struct field align = %v, want %v", st.FieldAlign(), stt.FieldAlign())
5304 for i := 0; i < st.NumField(); i++ {
5305 o1 := st.Field(i).Offset
5306 o2 := stt.Field(i).Offset
5308 t.Errorf("constructed zero-padded struct field %v offset = %v, want %v", i, o1, o2)
5312 // check duplicate names
5313 shouldPanic("duplicate field", func() {
5314 StructOf([]StructField{
5315 {Name: "string", PkgPath: "p", Type: TypeOf("")},
5316 {Name: "string", PkgPath: "p", Type: TypeOf("")},
5319 shouldPanic("has no name", func() {
5320 StructOf([]StructField{
5322 {Name: "string", PkgPath: "p", Type: TypeOf("")},
5325 shouldPanic("has no name", func() {
5326 StructOf([]StructField{
5331 // check that type already in binary is found
5332 checkSameType(t, StructOf(fields[2:3]), struct{ Y uint64 }{})
5334 // gccgo used to fail this test.
5335 type structFieldType any
5337 StructOf([]StructField{
5340 Type: TypeOf((*structFieldType)(nil)).Elem(),
5343 struct{ F structFieldType }{})
5346 func TestStructOfExportRules(t *testing.T) {
5352 testPanic := func(i int, mustPanic bool, f func()) {
5355 if err == nil && mustPanic {
5356 t.Errorf("test-%d did not panic", i)
5358 if err != nil && !mustPanic {
5359 t.Errorf("test-%d panicked: %v\n", i, err)
5371 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf(S1{})},
5375 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf((*S1)(nil))},
5379 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf(s2{})},
5383 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf((*s2)(nil))},
5387 field: StructField{Name: "Name", Type: nil, PkgPath: ""},
5391 field: StructField{Name: "", Type: TypeOf(S1{}), PkgPath: ""},
5395 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf(S1{}), PkgPath: "other/pkg"},
5399 field: StructField{Name: "S1", Anonymous: true, Type: TypeOf((*S1)(nil)), PkgPath: "other/pkg"},
5403 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf(s2{}), PkgPath: "other/pkg"},
5407 field: StructField{Name: "s2", Anonymous: true, Type: TypeOf((*s2)(nil)), PkgPath: "other/pkg"},
5411 field: StructField{Name: "s2", Type: TypeOf(int(0)), PkgPath: "other/pkg"},
5414 field: StructField{Name: "s2", Type: TypeOf(int(0)), PkgPath: "other/pkg"},
5417 field: StructField{Name: "S", Type: TypeOf(S1{})},
5421 field: StructField{Name: "S", Type: TypeOf((*S1)(nil))},
5425 field: StructField{Name: "S", Type: TypeOf(s2{})},
5429 field: StructField{Name: "S", Type: TypeOf((*s2)(nil))},
5433 field: StructField{Name: "s", Type: TypeOf(S1{})},
5437 field: StructField{Name: "s", Type: TypeOf((*S1)(nil))},
5441 field: StructField{Name: "s", Type: TypeOf(s2{})},
5445 field: StructField{Name: "s", Type: TypeOf((*s2)(nil))},
5449 field: StructField{Name: "s", Type: TypeOf(S1{}), PkgPath: "other/pkg"},
5452 field: StructField{Name: "s", Type: TypeOf((*S1)(nil)), PkgPath: "other/pkg"},
5455 field: StructField{Name: "s", Type: TypeOf(s2{}), PkgPath: "other/pkg"},
5458 field: StructField{Name: "s", Type: TypeOf((*s2)(nil)), PkgPath: "other/pkg"},
5461 field: StructField{Name: "", Type: TypeOf(ΦType{})},
5465 field: StructField{Name: "", Type: TypeOf(φType{})},
5469 field: StructField{Name: "Φ", Type: TypeOf(0)},
5473 field: StructField{Name: "φ", Type: TypeOf(0)},
5478 for i, test := range tests {
5479 testPanic(i, test.mustPanic, func() {
5480 typ := StructOf([]StructField{test.field})
5482 t.Errorf("test-%d: error creating struct type", i)
5485 field := typ.Field(0)
5488 panic("field.Name must not be empty")
5490 exported := token.IsExported(n)
5491 if exported != test.exported {
5492 t.Errorf("test-%d: got exported=%v want exported=%v", i, exported, test.exported)
5494 if field.PkgPath != test.field.PkgPath {
5495 t.Errorf("test-%d: got PkgPath=%q want pkgPath=%q", i, field.PkgPath, test.field.PkgPath)
5501 func TestStructOfGC(t *testing.T) {
5503 tt := TypeOf(T(nil))
5504 fields := []StructField{
5505 {Name: "X", Type: tt},
5506 {Name: "Y", Type: tt},
5508 st := StructOf(fields)
5512 for i := 0; i < n; i++ {
5514 for j := 0; j < v.NumField(); j++ {
5516 *p = uintptr(i*n + j)
5517 v.Field(j).Set(ValueOf(p).Convert(tt))
5519 x = append(x, v.Interface())
5523 for i, xi := range x {
5525 for j := 0; j < v.NumField(); j++ {
5526 k := v.Field(j).Elem().Interface()
5527 if k != uintptr(i*n+j) {
5528 t.Errorf("lost x[%d].%c = %d, want %d", i, "XY"[j], k, i*n+j)
5534 func TestStructOfAlg(t *testing.T) {
5535 st := StructOf([]StructField{{Name: "X", Tag: "x", Type: TypeOf(int(0))}})
5536 v1 := New(st).Elem()
5537 v2 := New(st).Elem()
5538 if !DeepEqual(v1.Interface(), v1.Interface()) {
5539 t.Errorf("constructed struct %v not equal to itself", v1.Interface())
5541 v1.FieldByName("X").Set(ValueOf(int(1)))
5542 if i1, i2 := v1.Interface(), v2.Interface(); DeepEqual(i1, i2) {
5543 t.Errorf("constructed structs %v and %v should not be equal", i1, i2)
5546 st = StructOf([]StructField{{Name: "X", Tag: "x", Type: TypeOf([]int(nil))}})
5548 shouldPanic("", func() { _ = v1.Interface() == v1.Interface() })
5551 func TestStructOfGenericAlg(t *testing.T) {
5552 st1 := StructOf([]StructField{
5553 {Name: "X", Tag: "x", Type: TypeOf(int64(0))},
5554 {Name: "Y", Type: TypeOf(string(""))},
5556 st := StructOf([]StructField{
5557 {Name: "S0", Type: st1},
5558 {Name: "S1", Type: st1},
5576 {Name: "XX", Type: TypeOf([0]int{})},
5577 {Name: "YY", Type: TypeOf("")},
5585 {Name: "XX", Type: TypeOf([0]int{})},
5586 {Name: "YY", Type: TypeOf("")},
5587 {Name: "ZZ", Type: TypeOf([2]int{})},
5595 {Name: "XX", Type: TypeOf([1]int{})},
5596 {Name: "YY", Type: TypeOf("")},
5604 {Name: "XX", Type: TypeOf([1]int{})},
5605 {Name: "YY", Type: TypeOf("")},
5606 {Name: "ZZ", Type: TypeOf([1]int{})},
5614 {Name: "XX", Type: TypeOf([2]int{})},
5615 {Name: "YY", Type: TypeOf("")},
5616 {Name: "ZZ", Type: TypeOf([2]int{})},
5624 {Name: "XX", Type: TypeOf(int64(0))},
5625 {Name: "YY", Type: TypeOf(byte(0))},
5626 {Name: "ZZ", Type: TypeOf("")},
5634 {Name: "XX", Type: TypeOf(int64(0))},
5635 {Name: "YY", Type: TypeOf(int64(0))},
5636 {Name: "ZZ", Type: TypeOf("")},
5637 {Name: "AA", Type: TypeOf([1]int64{})},
5644 for _, table := range tests {
5645 v1 := New(table.rt).Elem()
5646 v2 := New(table.rt).Elem()
5648 if !DeepEqual(v1.Interface(), v1.Interface()) {
5649 t.Errorf("constructed struct %v not equal to itself", v1.Interface())
5652 v1.FieldByIndex(table.idx).Set(ValueOf("abc"))
5653 v2.FieldByIndex(table.idx).Set(ValueOf("def"))
5654 if i1, i2 := v1.Interface(), v2.Interface(); DeepEqual(i1, i2) {
5655 t.Errorf("constructed structs %v and %v should not be equal", i1, i2)
5659 v1.FieldByIndex(table.idx).Set(ValueOf(abc))
5660 val := "+" + abc + "-"
5661 v2.FieldByIndex(table.idx).Set(ValueOf(val[1:4]))
5662 if i1, i2 := v1.Interface(), v2.Interface(); !DeepEqual(i1, i2) {
5663 t.Errorf("constructed structs %v and %v should be equal", i1, i2)
5667 m := MakeMap(MapOf(table.rt, TypeOf(int(0))))
5668 m.SetMapIndex(v1, ValueOf(1))
5669 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() {
5670 t.Errorf("constructed structs %#v and %#v have different hashes", i1, i2)
5673 v2.FieldByIndex(table.idx).Set(ValueOf("abc"))
5674 if i1, i2 := v1.Interface(), v2.Interface(); !DeepEqual(i1, i2) {
5675 t.Errorf("constructed structs %v and %v should be equal", i1, i2)
5678 if i1, i2 := v1.Interface(), v2.Interface(); !m.MapIndex(v2).IsValid() {
5679 t.Errorf("constructed structs %v and %v have different hashes", i1, i2)
5684 func TestStructOfDirectIface(t *testing.T) {
5686 type T struct{ X [1]*byte }
5687 i1 := Zero(TypeOf(T{})).Interface()
5688 v1 := ValueOf(&i1).Elem()
5689 p1 := v1.InterfaceData()[1]
5691 i2 := Zero(StructOf([]StructField{
5694 Type: ArrayOf(1, TypeOf((*int8)(nil))),
5697 v2 := ValueOf(&i2).Elem()
5698 p2 := v2.InterfaceData()[1]
5701 t.Errorf("got p1=%v. want=%v", p1, nil)
5705 t.Errorf("got p2=%v. want=%v", p2, nil)
5709 type T struct{ X [0]*byte }
5710 i1 := Zero(TypeOf(T{})).Interface()
5711 v1 := ValueOf(&i1).Elem()
5712 p1 := v1.InterfaceData()[1]
5714 i2 := Zero(StructOf([]StructField{
5717 Type: ArrayOf(0, TypeOf((*int8)(nil))),
5720 v2 := ValueOf(&i2).Elem()
5721 p2 := v2.InterfaceData()[1]
5724 t.Errorf("got p1=%v. want=not-%v", p1, nil)
5728 t.Errorf("got p2=%v. want=not-%v", p2, nil)
5735 func (i StructI) Get() int { return int(i) }
5739 func (i *StructIPtr) Get() int { return int(*i) }
5740 func (i *StructIPtr) Set(v int) { *(*int)(i) = v }
5742 type SettableStruct struct {
5746 func (p *SettableStruct) Set(v int) { p.SettableField = v }
5748 type SettablePointer struct {
5752 func (p *SettablePointer) Set(v int) { *p.SettableField = v }
5754 func TestStructOfWithInterface(t *testing.T) {
5756 type Iface interface {
5759 type IfaceSet interface {
5770 typ: TypeOf(StructI(want)),
5771 val: ValueOf(StructI(want)),
5776 typ: PointerTo(TypeOf(StructI(want))),
5777 val: ValueOf(func() any {
5785 typ: PointerTo(TypeOf(StructIPtr(want))),
5786 val: ValueOf(func() any {
5787 v := StructIPtr(want)
5794 typ: TypeOf(StructIPtr(want)),
5795 val: ValueOf(StructIPtr(want)),
5799 // typ: TypeOf((*Iface)(nil)).Elem(), // FIXME(sbinet): fix method.ifn/tfn
5800 // val: ValueOf(StructI(want)),
5805 for i, table := range tests {
5806 for j := 0; j < 2; j++ {
5807 var fields []StructField
5809 fields = append(fields, StructField{
5812 Type: TypeOf(int(0)),
5815 fields = append(fields, StructField{
5822 // We currently do not correctly implement methods
5823 // for embedded fields other than the first.
5824 // Therefore, for now, we expect those methods
5825 // to not exist. See issues 15924 and 20824.
5826 // When those issues are fixed, this test of panic
5827 // should be removed.
5828 if j == 1 && table.impl {
5831 if err := recover(); err == nil {
5832 t.Errorf("test-%d-%d did not panic", i, j)
5835 _ = StructOf(fields)
5840 rt := StructOf(fields)
5841 rv := New(rt).Elem()
5842 rv.Field(j).Set(table.val)
5844 if _, ok := rv.Interface().(Iface); ok != table.impl {
5846 t.Errorf("test-%d-%d: type=%v fails to implement Iface.\n", i, j, table.typ)
5848 t.Errorf("test-%d-%d: type=%v should NOT implement Iface\n", i, j, table.typ)
5857 v := rv.Interface().(Iface).Get()
5859 t.Errorf("test-%d-%d: x.Get()=%v. want=%v\n", i, j, v, want)
5862 fct := rv.MethodByName("Get")
5863 out := fct.Call(nil)
5864 if !DeepEqual(out[0].Interface(), want) {
5865 t.Errorf("test-%d-%d: x.Get()=%v. want=%v\n", i, j, out[0].Interface(), want)
5870 // Test an embedded nil pointer with pointer methods.
5871 fields := []StructField{{
5874 Type: PointerTo(TypeOf(StructIPtr(want))),
5876 rt := StructOf(fields)
5877 rv := New(rt).Elem()
5878 // This should panic since the pointer is nil.
5879 shouldPanic("", func() {
5880 rv.Interface().(IfaceSet).Set(want)
5883 // Test an embedded nil pointer to a struct with pointer methods.
5885 fields = []StructField{{
5886 Name: "SettableStruct",
5888 Type: PointerTo(TypeOf(SettableStruct{})),
5890 rt = StructOf(fields)
5892 // This should panic since the pointer is nil.
5893 shouldPanic("", func() {
5894 rv.Interface().(IfaceSet).Set(want)
5897 // The behavior is different if there is a second field,
5898 // since now an interface value holds a pointer to the struct
5899 // rather than just holding a copy of the struct.
5900 fields = []StructField{
5902 Name: "SettableStruct",
5904 Type: PointerTo(TypeOf(SettableStruct{})),
5907 Name: "EmptyStruct",
5909 Type: StructOf(nil),
5912 // With the current implementation this is expected to panic.
5913 // Ideally it should work and we should be able to see a panic
5914 // if we call the Set method.
5915 shouldPanic("", func() {
5919 // Embed a field that can be stored directly in an interface,
5920 // with a second field.
5921 fields = []StructField{
5923 Name: "SettablePointer",
5925 Type: TypeOf(SettablePointer{}),
5928 Name: "EmptyStruct",
5930 Type: StructOf(nil),
5933 // With the current implementation this is expected to panic.
5934 // Ideally it should work and we should be able to call the
5935 // Set and Get methods.
5936 shouldPanic("", func() {
5941 func TestStructOfTooManyFields(t *testing.T) {
5942 // Bug Fix: #25402 - this should not panic
5943 tt := StructOf([]StructField{
5944 {Name: "Time", Type: TypeOf(time.Time{}), Anonymous: true},
5947 if _, present := tt.MethodByName("After"); !present {
5948 t.Errorf("Expected method `After` to be found")
5952 func TestStructOfDifferentPkgPath(t *testing.T) {
5953 fields := []StructField{
5957 Type: TypeOf(int(0)),
5962 Type: TypeOf(int(0)),
5965 shouldPanic("different PkgPath", func() {
5970 func TestStructOfTooLarge(t *testing.T) {
5971 t1 := TypeOf(byte(0))
5972 t2 := TypeOf(int16(0))
5973 t4 := TypeOf(int32(0))
5974 t0 := ArrayOf(0, t1)
5976 // 2^64-3 sized type (or 2^32-3 on 32-bit archs)
5977 bigType := StructOf([]StructField{
5978 {Name: "F1", Type: ArrayOf(int(^uintptr(0)>>1), t1)},
5979 {Name: "F2", Type: ArrayOf(int(^uintptr(0)>>1-1), t1)},
5984 fields []StructField
5989 shouldPanic: false, // 2^64-1, ok
5990 fields: []StructField{
5991 {Name: "F1", Type: bigType},
5992 {Name: "F2", Type: ArrayOf(2, t1)},
5996 shouldPanic: true, // overflow in total size
5997 fields: []StructField{
5998 {Name: "F1", Type: bigType},
5999 {Name: "F2", Type: ArrayOf(3, t1)},
6003 shouldPanic: true, // overflow while aligning F2
6004 fields: []StructField{
6005 {Name: "F1", Type: bigType},
6006 {Name: "F2", Type: t4},
6010 shouldPanic: true, // overflow while adding trailing byte for zero-sized fields
6011 fields: []StructField{
6012 {Name: "F1", Type: bigType},
6013 {Name: "F2", Type: ArrayOf(2, t1)},
6014 {Name: "F3", Type: t0},
6018 shouldPanic: true, // overflow while aligning total size
6019 fields: []StructField{
6020 {Name: "F1", Type: t2},
6021 {Name: "F2", Type: bigType},
6026 for i, tt := range tests {
6030 if !tt.shouldPanic {
6032 t.Errorf("test %d should not panic, got %s", i, err)
6037 t.Errorf("test %d expected to panic", i)
6040 s := fmt.Sprintf("%s", err)
6041 if s != "reflect.StructOf: struct size would exceed virtual address space" {
6042 t.Errorf("test %d wrong panic message: %s", i, s)
6046 _ = StructOf(tt.fields)
6051 func TestChanOf(t *testing.T) {
6052 // check construction and use of type not in binary
6054 ct := ChanOf(BothDir, TypeOf(T("")))
6055 v := MakeChan(ct, 2)
6057 v.Send(ValueOf(T("hello")))
6059 v.Send(ValueOf(T("world")))
6066 if s1 != "hello" || s2 != "world" {
6067 t.Errorf("constructed chan: have %q, %q, want %q, %q", s1, s2, "hello", "world")
6070 // check that type already in binary is found
6072 checkSameType(t, ChanOf(BothDir, TypeOf(T1(1))), (chan T1)(nil))
6074 // Check arrow token association in undefined chan types.
6075 var left chan<- chan T
6076 var right chan (<-chan T)
6077 tLeft := ChanOf(SendDir, ChanOf(BothDir, TypeOf(T(""))))
6078 tRight := ChanOf(BothDir, ChanOf(RecvDir, TypeOf(T(""))))
6079 if tLeft != TypeOf(left) {
6080 t.Errorf("chan<-chan: have %s, want %T", tLeft, left)
6082 if tRight != TypeOf(right) {
6083 t.Errorf("chan<-chan: have %s, want %T", tRight, right)
6087 func TestChanOfDir(t *testing.T) {
6088 // check construction and use of type not in binary
6090 crt := ChanOf(RecvDir, TypeOf(T("")))
6091 cst := ChanOf(SendDir, TypeOf(T("")))
6093 // check that type already in binary is found
6095 checkSameType(t, ChanOf(RecvDir, TypeOf(T1(1))), (<-chan T1)(nil))
6096 checkSameType(t, ChanOf(SendDir, TypeOf(T1(1))), (chan<- T1)(nil))
6098 // check String form of ChanDir
6099 if crt.ChanDir().String() != "<-chan" {
6100 t.Errorf("chan dir: have %q, want %q", crt.ChanDir().String(), "<-chan")
6102 if cst.ChanDir().String() != "chan<-" {
6103 t.Errorf("chan dir: have %q, want %q", cst.ChanDir().String(), "chan<-")
6107 func TestChanOfGC(t *testing.T) {
6108 done := make(chan bool, 1)
6112 case <-time.After(5 * time.Second):
6113 panic("deadlock in TestChanOfGC")
6122 tt := TypeOf(T(nil))
6123 ct := ChanOf(BothDir, tt)
6125 // NOTE: The garbage collector handles allocated channels specially,
6126 // so we have to save pointers to channels in x; the pointer code will
6127 // use the gc info in the newly constructed chan type.
6130 for i := 0; i < n; i++ {
6131 v := MakeChan(ct, n)
6132 for j := 0; j < n; j++ {
6134 *p = uintptr(i*n + j)
6135 v.Send(ValueOf(p).Convert(tt))
6139 x = append(x, pv.Interface())
6143 for i, xi := range x {
6144 v := ValueOf(xi).Elem()
6145 for j := 0; j < n; j++ {
6147 k := pv.Elem().Interface()
6148 if k != uintptr(i*n+j) {
6149 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j)
6155 func TestMapOf(t *testing.T) {
6156 // check construction and use of type not in binary
6160 v := MakeMap(MapOf(TypeOf(K("")), TypeOf(V(0))))
6162 v.SetMapIndex(ValueOf(K("a")), ValueOf(V(1)))
6165 s := fmt.Sprint(v.Interface())
6168 t.Errorf("constructed map = %s, want %s", s, want)
6171 // check that type already in binary is found
6172 checkSameType(t, MapOf(TypeOf(V(0)), TypeOf(K(""))), map[V]K(nil))
6174 // check that invalid key type panics
6175 shouldPanic("invalid key type", func() { MapOf(TypeOf((func())(nil)), TypeOf(false)) })
6178 func TestMapOfGCKeys(t *testing.T) {
6180 tt := TypeOf(T(nil))
6181 mt := MapOf(tt, TypeOf(false))
6183 // NOTE: The garbage collector handles allocated maps specially,
6184 // so we have to save pointers to maps in x; the pointer code will
6185 // use the gc info in the newly constructed map type.
6188 for i := 0; i < n; i++ {
6190 for j := 0; j < n; j++ {
6192 *p = uintptr(i*n + j)
6193 v.SetMapIndex(ValueOf(p).Convert(tt), ValueOf(true))
6197 x = append(x, pv.Interface())
6201 for i, xi := range x {
6202 v := ValueOf(xi).Elem()
6204 for _, kv := range v.MapKeys() {
6205 out = append(out, int(kv.Elem().Interface().(uintptr)))
6208 for j, k := range out {
6210 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j)
6216 func TestMapOfGCValues(t *testing.T) {
6218 tt := TypeOf(T(nil))
6219 mt := MapOf(TypeOf(1), tt)
6221 // NOTE: The garbage collector handles allocated maps specially,
6222 // so we have to save pointers to maps in x; the pointer code will
6223 // use the gc info in the newly constructed map type.
6226 for i := 0; i < n; i++ {
6228 for j := 0; j < n; j++ {
6230 *p = uintptr(i*n + j)
6231 v.SetMapIndex(ValueOf(j), ValueOf(p).Convert(tt))
6235 x = append(x, pv.Interface())
6239 for i, xi := range x {
6240 v := ValueOf(xi).Elem()
6241 for j := 0; j < n; j++ {
6242 k := v.MapIndex(ValueOf(j)).Elem().Interface().(uintptr)
6243 if k != uintptr(i*n+j) {
6244 t.Errorf("lost x[%d][%d] = %d, want %d", i, j, k, i*n+j)
6250 func TestTypelinksSorted(t *testing.T) {
6252 for i, n := range TypeLinks() {
6254 t.Errorf("typelinks not sorted: %q [%d] > %q [%d]", last, i-1, n, i)
6260 func TestFuncOf(t *testing.T) {
6261 // check construction and use of type not in binary
6265 fn := func(args []Value) []Value {
6267 t.Errorf("args == %v, want exactly one arg", args)
6268 } else if args[0].Type() != TypeOf(K("")) {
6269 t.Errorf("args[0] is type %v, want %v", args[0].Type(), TypeOf(K("")))
6270 } else if args[0].String() != "gopher" {
6271 t.Errorf("args[0] = %q, want %q", args[0].String(), "gopher")
6273 return []Value{ValueOf(V(3.14))}
6275 v := MakeFunc(FuncOf([]Type{TypeOf(K(""))}, []Type{TypeOf(V(0))}, false), fn)
6277 outs := v.Call([]Value{ValueOf(K("gopher"))})
6279 t.Fatalf("v.Call returned %v, want exactly one result", outs)
6280 } else if outs[0].Type() != TypeOf(V(0)) {
6281 t.Fatalf("c.Call[0] is type %v, want %v", outs[0].Type(), TypeOf(V(0)))
6283 f := outs[0].Float()
6285 t.Errorf("constructed func returned %f, want %f", f, 3.14)
6288 // check that types already in binary are found
6290 testCases := []struct {
6295 {in: []Type{TypeOf(T1(0))}, want: (func(T1))(nil)},
6296 {in: []Type{TypeOf(int(0))}, want: (func(int))(nil)},
6297 {in: []Type{SliceOf(TypeOf(int(0)))}, variadic: true, want: (func(...int))(nil)},
6298 {in: []Type{TypeOf(int(0))}, out: []Type{TypeOf(false)}, want: (func(int) bool)(nil)},
6299 {in: []Type{TypeOf(int(0))}, out: []Type{TypeOf(false), TypeOf("")}, want: (func(int) (bool, string))(nil)},
6301 for _, tt := range testCases {
6302 checkSameType(t, FuncOf(tt.in, tt.out, tt.variadic), tt.want)
6305 // check that variadic requires last element be a slice.
6306 FuncOf([]Type{TypeOf(1), TypeOf(""), SliceOf(TypeOf(false))}, nil, true)
6307 shouldPanic("must be slice", func() { FuncOf([]Type{TypeOf(0), TypeOf(""), TypeOf(false)}, nil, true) })
6308 shouldPanic("must be slice", func() { FuncOf(nil, nil, true) })
6310 //testcase for #54669
6312 for i := 0; i < 51; i++ {
6313 in = append(in, TypeOf(1))
6315 FuncOf(in, nil, false)
6388 func TestEmbed(t *testing.T) {
6390 f, ok := typ.FieldByName("X")
6392 t.Fatalf(`FieldByName("X") should fail, returned %v`, f.Index)
6396 func TestAllocsInterfaceBig(t *testing.T) {
6397 if testing.Short() {
6398 t.Skip("skipping malloc count in short mode")
6401 if allocs := testing.AllocsPerRun(100, func() { v.Interface() }); allocs > 0 {
6402 t.Error("allocs:", allocs)
6406 func TestAllocsInterfaceSmall(t *testing.T) {
6407 if testing.Short() {
6408 t.Skip("skipping malloc count in short mode")
6410 v := ValueOf(int64(0))
6411 if allocs := testing.AllocsPerRun(100, func() { v.Interface() }); allocs > 0 {
6412 t.Error("allocs:", allocs)
6416 // An exhaustive is a mechanism for writing exhaustive or stochastic tests.
6417 // The basic usage is:
6420 // ... code using x.Maybe() or x.Choice(n) to create test cases ...
6423 // Each iteration of the loop returns a different set of results, until all
6424 // possible result sets have been explored. It is okay for different code paths
6425 // to make different method call sequences on x, but there must be no
6426 // other source of non-determinism in the call sequences.
6428 // When faced with a new decision, x chooses randomly. Future explorations
6429 // of that path will choose successive values for the result. Thus, stopping
6430 // the loop after a fixed number of iterations gives somewhat stochastic
6436 // v := make([]bool, x.Choose(4))
6437 // for i := range v {
6443 // prints (in some order):
6452 // [false false false]
6455 // [false false false false]
6457 // [true true true true]
6458 type exhaustive struct {
6464 type choice struct {
6470 func (x *exhaustive) Next() bool {
6472 x.r = rand.New(rand.NewSource(time.Now().UnixNano()))
6479 for i := len(x.last) - 1; i >= 0; i-- {
6483 x.last = x.last[:i+1]
6490 func (x *exhaustive) Choose(max int) int {
6491 if x.pos >= len(x.last) {
6492 x.last = append(x.last, choice{x.r.Intn(max), 0, max})
6497 panic("inconsistent use of exhaustive tester")
6499 return (c.n + c.off) % max
6502 func (x *exhaustive) Maybe() bool {
6503 return x.Choose(2) == 1
6506 func GCFunc(args []Value) []Value {
6511 func TestReflectFuncTraceback(t *testing.T) {
6512 f := MakeFunc(TypeOf(func() {}), GCFunc)
6516 func TestReflectMethodTraceback(t *testing.T) {
6518 m := ValueOf(p).MethodByName("GCMethod")
6519 i := ValueOf(m.Interface()).Call([]Value{ValueOf(5)})[0].Int()
6521 t.Errorf("Call returned %d; want 8", i)
6525 func TestSmallZero(t *testing.T) {
6528 if allocs := testing.AllocsPerRun(100, func() { Zero(typ) }); allocs > 0 {
6529 t.Errorf("Creating small zero values caused %f allocs, want 0", allocs)
6533 func TestBigZero(t *testing.T) {
6534 const size = 1 << 10
6536 z := Zero(ValueOf(v).Type()).Interface().([size]byte)
6537 for i := 0; i < size; i++ {
6539 t.Fatalf("Zero object not all zero, index %d", i)
6544 func TestZeroSet(t *testing.T) {
6552 a: 0xaaaaaaaaaaaaaaaa,
6553 T: T{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9},
6554 b: 0xbbbbbbbbbbbbbbbb,
6556 ValueOf(&v).Elem().Field(1).Set(Zero(TypeOf(T{})))
6558 a: 0xaaaaaaaaaaaaaaaa,
6559 b: 0xbbbbbbbbbbbbbbbb,
6561 t.Fatalf("Setting a field to a Zero value didn't work")
6565 func TestFieldByIndexNil(t *testing.T) {
6574 v.FieldByName("P") // should be fine
6577 if err := recover(); err == nil {
6578 t.Fatalf("no error")
6579 } else if !strings.Contains(fmt.Sprint(err), "nil pointer to embedded struct") {
6580 t.Fatalf(`err=%q, wanted error containing "nil pointer to embedded struct"`, err)
6583 v.FieldByName("F") // should panic
6585 t.Fatalf("did not panic")
6589 // type Outer struct {
6593 // the compiler generates the implementation of (*Outer).M dispatching to the embedded Inner.
6594 // The implementation is logically:
6595 // func (p *Outer) M() {
6598 // but since the only change here is the replacement of one pointer receiver with another,
6599 // the actual generated code overwrites the original receiver with the p.Inner pointer and
6600 // then jumps to the M method expecting the *Inner receiver.
6602 // During reflect.Value.Call, we create an argument frame and the associated data structures
6603 // to describe it to the garbage collector, populate the frame, call reflect.call to
6604 // run a function call using that frame, and then copy the results back out of the frame.
6605 // The reflect.call function does a memmove of the frame structure onto the
6606 // stack (to set up the inputs), runs the call, and the memmoves the stack back to
6607 // the frame structure (to preserve the outputs).
6609 // Originally reflect.call did not distinguish inputs from outputs: both memmoves
6610 // were for the full stack frame. However, in the case where the called function was
6611 // one of these wrappers, the rewritten receiver is almost certainly a different type
6612 // than the original receiver. This is not a problem on the stack, where we use the
6613 // program counter to determine the type information and understand that
6614 // during (*Outer).M the receiver is an *Outer while during (*Inner).M the receiver in the same
6615 // memory word is now an *Inner. But in the statically typed argument frame created
6616 // by reflect, the receiver is always an *Outer. Copying the modified receiver pointer
6617 // off the stack into the frame will store an *Inner there, and then if a garbage collection
6618 // happens to scan that argument frame before it is discarded, it will scan the *Inner
6619 // memory as if it were an *Outer. If the two have different memory layouts, the
6620 // collection will interpret the memory incorrectly.
6622 // One such possible incorrect interpretation is to treat two arbitrary memory words
6623 // (Inner.P1 and Inner.P2 below) as an interface (Outer.R below). Because interpreting
6624 // an interface requires dereferencing the itab word, the misinterpretation will try to
6625 // deference Inner.P1, causing a crash during garbage collection.
6627 // This came up in a real program in issue 7725.
6640 func (pi *Inner) M() {
6641 // Clear references to pi so that the only way the
6642 // garbage collection will find the pointer is in the
6643 // argument frame, typed as a *Outer.
6646 // Set up an interface value that will cause a crash.
6647 // P1 = 1 is a non-zero, so the interface looks non-nil.
6648 // P2 = pi ensures that the data word points into the
6649 // allocated heap; if not the collection skips the interface
6650 // value as irrelevant, without dereferencing P1.
6652 pi.P2 = uintptr(unsafe.Pointer(pi))
6655 func TestCallMethodJump(t *testing.T) {
6656 // In reflect.Value.Call, trigger a garbage collection after reflect.call
6657 // returns but before the args frame has been discarded.
6658 // This is a little clumsy but makes the failure repeatable.
6661 p := &Outer{Inner: new(Inner)}
6663 ValueOf(p).Method(0).Call(nil)
6665 // Stop garbage collecting during reflect.call.
6669 func TestCallArgLive(t *testing.T) {
6670 type T struct{ X, Y *string } // pointerful aggregate
6672 F := func(t T) { *t.X = "ok" }
6674 // In reflect.Value.Call, trigger a garbage collection in reflect.call
6675 // between marshaling argument and the actual call.
6679 runtime.SetFinalizer(x, func(p *string) {
6681 t.Errorf("x dead prematurely")
6686 ValueOf(F).Call([]Value{ValueOf(v)})
6688 // Stop garbage collecting during reflect.call.
6692 func TestMakeFuncStackCopy(t *testing.T) {
6693 target := func(in []Value) []Value {
6696 return []Value{ValueOf(9)}
6699 var concrete func(*int, int) int
6700 fn := MakeFunc(ValueOf(concrete).Type(), target)
6701 ValueOf(&concrete).Elem().Set(fn)
6702 x := concrete(nil, 7)
6704 t.Errorf("have %#q want 9", x)
6708 // use about n KB of stack
6709 func useStack(n int) {
6713 var b [1024]byte // makes frame about 1KB
6714 useStack(n - 1 + int(b[99]))
6721 func TestValueString(t *testing.T) {
6722 rv := ValueOf(Impl{})
6723 if rv.String() != "<reflect_test.Impl Value>" {
6724 t.Errorf("ValueOf(Impl{}).String() = %q, want %q", rv.String(), "<reflect_test.Impl Value>")
6727 method := rv.Method(0)
6728 if method.String() != "<func() Value>" {
6729 t.Errorf("ValueOf(Impl{}).Method(0).String() = %q, want %q", method.String(), "<func() Value>")
6733 func TestInvalid(t *testing.T) {
6734 // Used to have inconsistency between IsValid() and Kind() != Invalid.
6735 type T struct{ v any }
6737 v := ValueOf(T{}).Field(0)
6738 if v.IsValid() != true || v.Kind() != Interface {
6739 t.Errorf("field: IsValid=%v, Kind=%v, want true, Interface", v.IsValid(), v.Kind())
6742 if v.IsValid() != false || v.Kind() != Invalid {
6743 t.Errorf("field elem: IsValid=%v, Kind=%v, want false, Invalid", v.IsValid(), v.Kind())
6748 func TestLargeGCProg(t *testing.T) {
6749 fv := ValueOf(func([256]*byte) {})
6750 fv.Call([]Value{ValueOf([256]*byte{})})
6753 func fieldIndexRecover(t Type, i int) (recovered any) {
6755 recovered = recover()
6763 func TestTypeFieldOutOfRangePanic(t *testing.T) {
6764 typ := TypeOf(struct{ X int }{10})
6765 testIndices := [...]struct {
6774 for i, tt := range testIndices {
6775 recoveredErr := fieldIndexRecover(typ, tt.i)
6777 if recoveredErr == nil {
6778 t.Errorf("#%d: fieldIndex %d expected to panic", i, tt.i)
6781 if recoveredErr != nil {
6782 t.Errorf("#%d: got err=%v, expected no panic", i, recoveredErr)
6789 func TestCallGC(t *testing.T) {
6790 f := func(a, b, c, d, e string) {
6792 g := func(in []Value) []Value {
6796 typ := ValueOf(f).Type()
6797 f2 := MakeFunc(typ, g).Interface().(func(string, string, string, string, string))
6798 f2("four", "five5", "six666", "seven77", "eight888")
6801 // Issue 18635 (function version).
6802 func TestKeepFuncLive(t *testing.T) {
6803 // Test that we keep makeFuncImpl live as long as it is
6804 // referenced on the stack.
6805 typ := TypeOf(func(i int) {})
6806 var f, g func(in []Value) []Value
6807 f = func(in []Value) []Value {
6809 i := int(in[0].Int())
6811 // We can't use Value.Call here because
6812 // runtime.call* will keep the makeFuncImpl
6813 // alive. However, by converting it to an
6814 // interface value and calling that,
6815 // reflect.callReflect is the only thing that
6816 // can keep the makeFuncImpl live.
6818 // Alternate between f and g so that if we do
6819 // reuse the memory prematurely it's more
6820 // likely to get obviously corrupted.
6821 MakeFunc(typ, g).Interface().(func(i int))(i - 1)
6825 g = func(in []Value) []Value {
6827 i := int(in[0].Int())
6828 MakeFunc(typ, f).Interface().(func(i int))(i)
6831 MakeFunc(typ, f).Call([]Value{ValueOf(10)})
6834 type UnExportedFirst int
6836 func (i UnExportedFirst) ΦExported() {}
6837 func (i UnExportedFirst) unexported() {}
6840 func TestMethodByNameUnExportedFirst(t *testing.T) {
6842 if recover() != nil {
6843 t.Errorf("should not panic")
6846 typ := TypeOf(UnExportedFirst(0))
6847 m, _ := typ.MethodByName("ΦExported")
6848 if m.Name != "ΦExported" {
6849 t.Errorf("got %s, expected ΦExported", m.Name)
6853 // Issue 18635 (method version).
6854 type KeepMethodLive struct{}
6856 func (k KeepMethodLive) Method1(i int) {
6859 ValueOf(k).MethodByName("Method2").Interface().(func(i int))(i - 1)
6863 func (k KeepMethodLive) Method2(i int) {
6865 ValueOf(k).MethodByName("Method1").Interface().(func(i int))(i)
6868 func TestKeepMethodLive(t *testing.T) {
6869 // Test that we keep methodValue live as long as it is
6870 // referenced on the stack.
6871 KeepMethodLive{}.Method1(10)
6874 // clobber tries to clobber unreachable memory.
6877 for i := 1; i < 32; i++ {
6878 for j := 0; j < 10; j++ {
6879 obj := make([]*byte, i)
6886 func TestFuncLayout(t *testing.T) {
6887 align := func(x uintptr) uintptr {
6888 return (x + goarch.PtrSize - 1) &^ (goarch.PtrSize - 1)
6891 if goarch.PtrSize == 4 {
6892 r = []byte{0, 0, 0, 1}
6904 size, argsize, retOffset uintptr
6905 stack, gc, inRegs, outRegs []byte // pointer bitmap: 1 is pointer, 0 is scalar
6906 intRegs, floatRegs int
6907 floatRegSize uintptr
6911 typ: ValueOf(func(a, b string) string { return "" }).Type(),
6912 size: 6 * goarch.PtrSize,
6913 argsize: 4 * goarch.PtrSize,
6914 retOffset: 4 * goarch.PtrSize,
6915 stack: []byte{1, 0, 1, 0, 1},
6916 gc: []byte{1, 0, 1, 0, 1},
6919 typ: ValueOf(func(a, b, c uint32, p *byte, d uint16) {}).Type(),
6920 size: align(align(3*4) + goarch.PtrSize + 2),
6921 argsize: align(3*4) + goarch.PtrSize + 2,
6922 retOffset: align(align(3*4) + goarch.PtrSize + 2),
6927 typ: ValueOf(func(a map[int]int, b uintptr, c any) {}).Type(),
6928 size: 4 * goarch.PtrSize,
6929 argsize: 4 * goarch.PtrSize,
6930 retOffset: 4 * goarch.PtrSize,
6931 stack: []byte{1, 0, 1, 1},
6932 gc: []byte{1, 0, 1, 1},
6935 typ: ValueOf(func(a S) {}).Type(),
6936 size: 4 * goarch.PtrSize,
6937 argsize: 4 * goarch.PtrSize,
6938 retOffset: 4 * goarch.PtrSize,
6939 stack: []byte{0, 0, 1, 1},
6940 gc: []byte{0, 0, 1, 1},
6943 rcvr: ValueOf((*byte)(nil)).Type(),
6944 typ: ValueOf(func(a uintptr, b *int) {}).Type(),
6945 size: 3 * goarch.PtrSize,
6946 argsize: 3 * goarch.PtrSize,
6947 retOffset: 3 * goarch.PtrSize,
6948 stack: []byte{1, 0, 1},
6949 gc: []byte{1, 0, 1},
6952 typ: ValueOf(func(a uintptr) {}).Type(),
6953 size: goarch.PtrSize,
6954 argsize: goarch.PtrSize,
6955 retOffset: goarch.PtrSize,
6960 typ: ValueOf(func() uintptr { return 0 }).Type(),
6961 size: goarch.PtrSize,
6968 rcvr: ValueOf(uintptr(0)).Type(),
6969 typ: ValueOf(func(a uintptr) {}).Type(),
6970 size: 2 * goarch.PtrSize,
6971 argsize: 2 * goarch.PtrSize,
6972 retOffset: 2 * goarch.PtrSize,
6975 // Note: this one is tricky, as the receiver is not a pointer. But we
6976 // pass the receiver by reference to the autogenerated pointer-receiver
6977 // version of the function.
6979 // TODO(mknyszek): Add tests for non-zero register count.
6981 for _, lt := range tests {
6982 name := lt.typ.String()
6984 name = lt.rcvr.String() + "." + name
6986 t.Run(name, func(t *testing.T) {
6987 defer SetArgRegs(SetArgRegs(lt.intRegs, lt.floatRegs, lt.floatRegSize))
6989 typ, argsize, retOffset, stack, gc, inRegs, outRegs, ptrs := FuncLayout(lt.typ, lt.rcvr)
6990 if typ.Size() != lt.size {
6991 t.Errorf("funcLayout(%v, %v).size=%d, want %d", lt.typ, lt.rcvr, typ.Size(), lt.size)
6993 if argsize != lt.argsize {
6994 t.Errorf("funcLayout(%v, %v).argsize=%d, want %d", lt.typ, lt.rcvr, argsize, lt.argsize)
6996 if retOffset != lt.retOffset {
6997 t.Errorf("funcLayout(%v, %v).retOffset=%d, want %d", lt.typ, lt.rcvr, retOffset, lt.retOffset)
6999 if !bytes.Equal(stack, lt.stack) {
7000 t.Errorf("funcLayout(%v, %v).stack=%v, want %v", lt.typ, lt.rcvr, stack, lt.stack)
7002 if !bytes.Equal(gc, lt.gc) {
7003 t.Errorf("funcLayout(%v, %v).gc=%v, want %v", lt.typ, lt.rcvr, gc, lt.gc)
7005 if !bytes.Equal(inRegs, lt.inRegs) {
7006 t.Errorf("funcLayout(%v, %v).inRegs=%v, want %v", lt.typ, lt.rcvr, inRegs, lt.inRegs)
7008 if !bytes.Equal(outRegs, lt.outRegs) {
7009 t.Errorf("funcLayout(%v, %v).outRegs=%v, want %v", lt.typ, lt.rcvr, outRegs, lt.outRegs)
7011 if ptrs && len(stack) == 0 || !ptrs && len(stack) > 0 {
7012 t.Errorf("funcLayout(%v, %v) pointers flag=%v, want %v", lt.typ, lt.rcvr, ptrs, !ptrs)
7018 // trimBitmap removes trailing 0 elements from b and returns the result.
7019 func trimBitmap(b []byte) []byte {
7020 for len(b) > 0 && b[len(b)-1] == 0 {
7026 func verifyGCBits(t *testing.T, typ Type, bits []byte) {
7027 heapBits := GCBits(New(typ).Interface())
7029 // Trim scalars at the end, as bits might end in zero,
7030 // e.g. with rep(2, lit(1, 0)).
7031 bits = trimBitmap(bits)
7033 if bytes.HasPrefix(heapBits, bits) {
7034 // Just the prefix matching is OK.
7036 // The Go runtime's pointer/scalar iterator generates pointers beyond
7037 // the size of the type, up to the size of the size class. This space
7038 // is safe for the GC to scan since it's zero, and GCBits checks to
7039 // make sure that's true. But we need to handle the fact that the bitmap
7040 // may be larger than we expect.
7043 _, _, line, _ := runtime.Caller(1)
7044 t.Errorf("line %d: heapBits incorrect for %v\nhave %v\nwant %v", line, typ, heapBits, bits)
7047 func verifyGCBitsSlice(t *testing.T, typ Type, cap int, bits []byte) {
7048 // Creating a slice causes the runtime to repeat a bitmap,
7049 // which exercises a different path from making the compiler
7050 // repeat a bitmap for a small array or executing a repeat in
7052 val := MakeSlice(typ, 0, cap)
7053 data := NewAt(typ.Elem(), val.UnsafePointer())
7054 heapBits := GCBits(data.Interface())
7055 // Repeat the bitmap for the slice size, trimming scalars in
7056 // the last element.
7057 bits = trimBitmap(rep(cap, bits))
7058 if bytes.Equal(heapBits, bits) {
7061 if len(heapBits) > len(bits) && bytes.Equal(heapBits[:len(bits)], bits) {
7062 // Just the prefix matching is OK.
7065 _, _, line, _ := runtime.Caller(1)
7066 t.Errorf("line %d: heapBits incorrect for make(%v, 0, %v)\nhave %v\nwant %v", line, typ, cap, heapBits, bits)
7069 func TestGCBits(t *testing.T) {
7070 verifyGCBits(t, TypeOf((*byte)(nil)), []byte{1})
7072 // Building blocks for types seen by the compiler (like [2]Xscalar).
7073 // The compiler will create the type structures for the derived types,
7074 // including their GC metadata.
7075 type Xscalar struct{ x uintptr }
7076 type Xptr struct{ x *byte }
7077 type Xptrscalar struct {
7081 type Xscalarptr struct {
7085 type Xbigptrscalar struct {
7090 var Tscalar, Tint64, Tptr, Tscalarptr, Tptrscalar, Tbigptrscalar Type
7092 // Building blocks for types constructed by reflect.
7093 // This code is in a separate block so that code below
7094 // cannot accidentally refer to these.
7095 // The compiler must NOT see types derived from these
7096 // (for example, [2]Scalar must NOT appear in the program),
7097 // or else reflect will use it instead of having to construct one.
7098 // The goal is to test the construction.
7099 type Scalar struct{ x uintptr }
7100 type Ptr struct{ x *byte }
7101 type Ptrscalar struct {
7105 type Scalarptr struct {
7109 type Bigptrscalar struct {
7114 Tscalar = TypeOf(Scalar{})
7115 Tint64 = TypeOf(Int64(0))
7116 Tptr = TypeOf(Ptr{})
7117 Tscalarptr = TypeOf(Scalarptr{})
7118 Tptrscalar = TypeOf(Ptrscalar{})
7119 Tbigptrscalar = TypeOf(Bigptrscalar{})
7124 verifyGCBits(t, TypeOf(Xscalar{}), empty)
7125 verifyGCBits(t, Tscalar, empty)
7126 verifyGCBits(t, TypeOf(Xptr{}), lit(1))
7127 verifyGCBits(t, Tptr, lit(1))
7128 verifyGCBits(t, TypeOf(Xscalarptr{}), lit(0, 1))
7129 verifyGCBits(t, Tscalarptr, lit(0, 1))
7130 verifyGCBits(t, TypeOf(Xptrscalar{}), lit(1))
7131 verifyGCBits(t, Tptrscalar, lit(1))
7133 verifyGCBits(t, TypeOf([0]Xptr{}), empty)
7134 verifyGCBits(t, ArrayOf(0, Tptr), empty)
7135 verifyGCBits(t, TypeOf([1]Xptrscalar{}), lit(1))
7136 verifyGCBits(t, ArrayOf(1, Tptrscalar), lit(1))
7137 verifyGCBits(t, TypeOf([2]Xscalar{}), empty)
7138 verifyGCBits(t, ArrayOf(2, Tscalar), empty)
7139 verifyGCBits(t, TypeOf([10000]Xscalar{}), empty)
7140 verifyGCBits(t, ArrayOf(10000, Tscalar), empty)
7141 verifyGCBits(t, TypeOf([2]Xptr{}), lit(1, 1))
7142 verifyGCBits(t, ArrayOf(2, Tptr), lit(1, 1))
7143 verifyGCBits(t, TypeOf([10000]Xptr{}), rep(10000, lit(1)))
7144 verifyGCBits(t, ArrayOf(10000, Tptr), rep(10000, lit(1)))
7145 verifyGCBits(t, TypeOf([2]Xscalarptr{}), lit(0, 1, 0, 1))
7146 verifyGCBits(t, ArrayOf(2, Tscalarptr), lit(0, 1, 0, 1))
7147 verifyGCBits(t, TypeOf([10000]Xscalarptr{}), rep(10000, lit(0, 1)))
7148 verifyGCBits(t, ArrayOf(10000, Tscalarptr), rep(10000, lit(0, 1)))
7149 verifyGCBits(t, TypeOf([2]Xptrscalar{}), lit(1, 0, 1))
7150 verifyGCBits(t, ArrayOf(2, Tptrscalar), lit(1, 0, 1))
7151 verifyGCBits(t, TypeOf([10000]Xptrscalar{}), rep(10000, lit(1, 0)))
7152 verifyGCBits(t, ArrayOf(10000, Tptrscalar), rep(10000, lit(1, 0)))
7153 verifyGCBits(t, TypeOf([1][10000]Xptrscalar{}), rep(10000, lit(1, 0)))
7154 verifyGCBits(t, ArrayOf(1, ArrayOf(10000, Tptrscalar)), rep(10000, lit(1, 0)))
7155 verifyGCBits(t, TypeOf([2][10000]Xptrscalar{}), rep(2*10000, lit(1, 0)))
7156 verifyGCBits(t, ArrayOf(2, ArrayOf(10000, Tptrscalar)), rep(2*10000, lit(1, 0)))
7157 verifyGCBits(t, TypeOf([4]Xbigptrscalar{}), join(rep(3, join(rep(100, lit(1)), rep(100, lit(0)))), rep(100, lit(1))))
7158 verifyGCBits(t, ArrayOf(4, Tbigptrscalar), join(rep(3, join(rep(100, lit(1)), rep(100, lit(0)))), rep(100, lit(1))))
7160 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 0, empty)
7161 verifyGCBitsSlice(t, SliceOf(Tptr), 0, empty)
7162 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 1, lit(1))
7163 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 1, lit(1))
7164 verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 2, lit(0))
7165 verifyGCBitsSlice(t, SliceOf(Tscalar), 2, lit(0))
7166 verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 10000, lit(0))
7167 verifyGCBitsSlice(t, SliceOf(Tscalar), 10000, lit(0))
7168 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 2, lit(1))
7169 verifyGCBitsSlice(t, SliceOf(Tptr), 2, lit(1))
7170 verifyGCBitsSlice(t, TypeOf([]Xptr{}), 10000, lit(1))
7171 verifyGCBitsSlice(t, SliceOf(Tptr), 10000, lit(1))
7172 verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 2, lit(0, 1))
7173 verifyGCBitsSlice(t, SliceOf(Tscalarptr), 2, lit(0, 1))
7174 verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 10000, lit(0, 1))
7175 verifyGCBitsSlice(t, SliceOf(Tscalarptr), 10000, lit(0, 1))
7176 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 2, lit(1, 0))
7177 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 2, lit(1, 0))
7178 verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 10000, lit(1, 0))
7179 verifyGCBitsSlice(t, SliceOf(Tptrscalar), 10000, lit(1, 0))
7180 verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 1, rep(10000, lit(1, 0)))
7181 verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 1, rep(10000, lit(1, 0)))
7182 verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 2, rep(10000, lit(1, 0)))
7183 verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 2, rep(10000, lit(1, 0)))
7184 verifyGCBitsSlice(t, TypeOf([]Xbigptrscalar{}), 4, join(rep(100, lit(1)), rep(100, lit(0))))
7185 verifyGCBitsSlice(t, SliceOf(Tbigptrscalar), 4, join(rep(100, lit(1)), rep(100, lit(0))))
7187 verifyGCBits(t, TypeOf((chan [100]Xscalar)(nil)), lit(1))
7188 verifyGCBits(t, ChanOf(BothDir, ArrayOf(100, Tscalar)), lit(1))
7190 verifyGCBits(t, TypeOf((func([10000]Xscalarptr))(nil)), lit(1))
7191 verifyGCBits(t, FuncOf([]Type{ArrayOf(10000, Tscalarptr)}, nil, false), lit(1))
7193 verifyGCBits(t, TypeOf((map[[10000]Xscalarptr]Xscalar)(nil)), lit(1))
7194 verifyGCBits(t, MapOf(ArrayOf(10000, Tscalarptr), Tscalar), lit(1))
7196 verifyGCBits(t, TypeOf((*[10000]Xscalar)(nil)), lit(1))
7197 verifyGCBits(t, PointerTo(ArrayOf(10000, Tscalar)), lit(1))
7199 verifyGCBits(t, TypeOf(([][10000]Xscalar)(nil)), lit(1))
7200 verifyGCBits(t, SliceOf(ArrayOf(10000, Tscalar)), lit(1))
7202 hdr := make([]byte, bucketCount/goarch.PtrSize)
7204 verifyMapBucket := func(t *testing.T, k, e Type, m any, want []byte) {
7205 verifyGCBits(t, MapBucketOf(k, e), want)
7206 verifyGCBits(t, CachedBucketOf(TypeOf(m)), want)
7210 map[Xscalar]Xptr(nil),
7211 join(hdr, rep(bucketCount, lit(0)), rep(bucketCount, lit(1)), lit(1)))
7214 map[Xscalarptr]Xptr(nil),
7215 join(hdr, rep(bucketCount, lit(0, 1)), rep(bucketCount, lit(1)), lit(1)))
7216 verifyMapBucket(t, Tint64, Tptr,
7217 map[int64]Xptr(nil),
7218 join(hdr, rep(bucketCount, rep(8/goarch.PtrSize, lit(0))), rep(bucketCount, lit(1)), lit(1)))
7221 map[Xscalar]Xscalar(nil),
7224 ArrayOf(2, Tscalarptr), ArrayOf(3, Tptrscalar),
7225 map[[2]Xscalarptr][3]Xptrscalar(nil),
7226 join(hdr, rep(bucketCount*2, lit(0, 1)), rep(bucketCount*3, lit(1, 0)), lit(1)))
7228 ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar),
7229 map[[64 / goarch.PtrSize]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil),
7230 join(hdr, rep(bucketCount*64/goarch.PtrSize, lit(0, 1)), rep(bucketCount*64/goarch.PtrSize, lit(1, 0)), lit(1)))
7232 ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar),
7233 map[[64/goarch.PtrSize + 1]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil),
7234 join(hdr, rep(bucketCount, lit(1)), rep(bucketCount*64/goarch.PtrSize, lit(1, 0)), lit(1)))
7236 ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar),
7237 map[[64 / goarch.PtrSize]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil),
7238 join(hdr, rep(bucketCount*64/goarch.PtrSize, lit(0, 1)), rep(bucketCount, lit(1)), lit(1)))
7240 ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar),
7241 map[[64/goarch.PtrSize + 1]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil),
7242 join(hdr, rep(bucketCount, lit(1)), rep(bucketCount, lit(1)), lit(1)))
7245 func rep(n int, b []byte) []byte { return bytes.Repeat(b, n) }
7246 func join(b ...[]byte) []byte { return bytes.Join(b, nil) }
7247 func lit(x ...byte) []byte { return x }
7249 func TestTypeOfTypeOf(t *testing.T) {
7250 // Check that all the type constructors return concrete *rtype implementations.
7251 // It's difficult to test directly because the reflect package is only at arm's length.
7252 // The easiest thing to do is just call a function that crashes if it doesn't get an *rtype.
7253 check := func(name string, typ Type) {
7254 if underlying := TypeOf(typ).String(); underlying != "*reflect.rtype" {
7255 t.Errorf("%v returned %v, not *reflect.rtype", name, underlying)
7259 type T struct{ int }
7260 check("TypeOf", TypeOf(T{}))
7262 check("ArrayOf", ArrayOf(10, TypeOf(T{})))
7263 check("ChanOf", ChanOf(BothDir, TypeOf(T{})))
7264 check("FuncOf", FuncOf([]Type{TypeOf(T{})}, nil, false))
7265 check("MapOf", MapOf(TypeOf(T{}), TypeOf(T{})))
7266 check("PtrTo", PointerTo(TypeOf(T{})))
7267 check("SliceOf", SliceOf(TypeOf(T{})))
7270 type XM struct{ _ bool }
7272 func (*XM) String() string { return "" }
7274 func TestPtrToMethods(t *testing.T) {
7276 yp := New(TypeOf(y)).Interface()
7277 _, ok := yp.(fmt.Stringer)
7279 t.Fatal("does not implement Stringer, but should")
7283 func TestMapAlloc(t *testing.T) {
7284 m := ValueOf(make(map[int]int, 10))
7287 allocs := testing.AllocsPerRun(100, func() {
7291 t.Errorf("allocs per map assignment: want 0 got %f", allocs)
7296 val := ValueOf(&tmp).Elem()
7297 allocs = testing.AllocsPerRun(100, func() {
7298 mv := MakeMapWithSize(TypeOf(map[int]int{}), size)
7299 // Only adding half of the capacity to not trigger re-allocations due too many overloaded buckets.
7300 for i := 0; i < size/2; i++ {
7301 val.SetInt(int64(i))
7302 mv.SetMapIndex(val, val)
7306 t.Errorf("allocs per map assignment: want at most 10 got %f", allocs)
7308 // Empirical testing shows that with capacity hint single run will trigger 3 allocations and without 91. I set
7309 // the threshold to 10, to not make it overly brittle if something changes in the initial allocation of the
7310 // map, but to still catch a regression where we keep re-allocating in the hashmap as new entries are added.
7313 func TestChanAlloc(t *testing.T) {
7314 // Note: for a chan int, the return Value must be allocated, so we
7315 // use a chan *int instead.
7316 c := ValueOf(make(chan *int, 1))
7317 v := ValueOf(new(int))
7318 allocs := testing.AllocsPerRun(100, func() {
7322 if allocs < 0.5 || allocs > 1.5 {
7323 t.Errorf("allocs per chan send/recv: want 1 got %f", allocs)
7325 // Note: there is one allocation in reflect.recv which seems to be
7326 // a limitation of escape analysis. If that is ever fixed the
7327 // allocs < 0.5 condition will trigger and this test should be fixed.
7330 type TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678 int
7332 type nameTest struct {
7337 var nameTests = []nameTest{
7338 {(*int32)(nil), "int32"},
7341 {(*chan D1)(nil), ""},
7342 {(*func() D1)(nil), ""},
7343 {(*<-chan D1)(nil), ""},
7344 {(*chan<- D1)(nil), ""},
7349 {(*TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678)(nil), "TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678"},
7352 func TestNames(t *testing.T) {
7353 for _, test := range nameTests {
7354 typ := TypeOf(test.v).Elem()
7355 if got := typ.Name(); got != test.want {
7356 t.Errorf("%v Name()=%q, want %q", typ, got, test.want)
7361 func TestExported(t *testing.T) {
7362 type ΦExported struct{}
7363 type φUnexported struct{}
7370 type exportTest struct {
7374 exportTests := []exportTest{
7378 {(*big)(nil), false},
7379 {(BigP)(nil), true},
7380 {(*BigP)(nil), true},
7381 {ΦExported{}, true},
7382 {φUnexported{}, false},
7389 for i, test := range exportTests {
7390 typ := TypeOf(test.v)
7391 if got := IsExported(typ); got != test.want {
7392 t.Errorf("%d: %s exported=%v, want %v", i, typ.Name(), got, test.want)
7397 func TestTypeStrings(t *testing.T) {
7398 type stringTest struct {
7402 stringTests := []stringTest{
7403 {TypeOf(func(int) {}), "func(int)"},
7404 {FuncOf([]Type{TypeOf(int(0))}, nil, false), "func(int)"},
7405 {TypeOf(XM{}), "reflect_test.XM"},
7406 {TypeOf(new(XM)), "*reflect_test.XM"},
7407 {TypeOf(new(XM).String), "func() string"},
7408 {TypeOf(new(XM)).Method(0).Type, "func(*reflect_test.XM) string"},
7409 {ChanOf(3, TypeOf(XM{})), "chan reflect_test.XM"},
7410 {MapOf(TypeOf(int(0)), TypeOf(XM{})), "map[int]reflect_test.XM"},
7411 {ArrayOf(3, TypeOf(XM{})), "[3]reflect_test.XM"},
7412 {ArrayOf(3, TypeOf(struct{}{})), "[3]struct {}"},
7415 for i, test := range stringTests {
7416 if got, want := test.typ.String(), test.want; got != want {
7417 t.Errorf("type %d String()=%q, want %q", i, got, want)
7422 func TestOffsetLock(t *testing.T) {
7423 var wg sync.WaitGroup
7424 for i := 0; i < 4; i++ {
7428 for j := 0; j < 50; j++ {
7429 ResolveReflectName(fmt.Sprintf("OffsetLockName:%d:%d", i, j))
7437 func TestSwapper(t *testing.T) {
7443 type pairPtr struct {
7455 in: []int{1, 20, 300},
7458 want: []int{300, 20, 1},
7461 in: []uintptr{1, 20, 300},
7464 want: []uintptr{300, 20, 1},
7467 in: []int16{1, 20, 300},
7470 want: []int16{300, 20, 1},
7473 in: []int8{1, 20, 100},
7476 want: []int8{100, 20, 1},
7479 in: []*I{&a, &b, &c},
7482 want: []*I{&c, &b, &a},
7485 in: []string{"eric", "sergey", "larry"},
7488 want: []string{"larry", "sergey", "eric"},
7491 in: []S{"eric", "sergey", "larry"},
7494 want: []S{"larry", "sergey", "eric"},
7497 in: []pair{{1, 2}, {3, 4}, {5, 6}},
7500 want: []pair{{5, 6}, {3, 4}, {1, 2}},
7503 in: []pairPtr{{1, 2, &a}, {3, 4, &b}, {5, 6, &c}},
7506 want: []pairPtr{{5, 6, &c}, {3, 4, &b}, {1, 2, &a}},
7510 for i, tt := range tests {
7511 inStr := fmt.Sprint(tt.in)
7512 Swapper(tt.in)(tt.i, tt.j)
7513 if !DeepEqual(tt.in, tt.want) {
7514 t.Errorf("%d. swapping %v and %v of %v = %v; want %v", i, tt.i, tt.j, inStr, tt.in, tt.want)
7519 // TestUnaddressableField tests that the reflect package will not allow
7520 // a type from another package to be used as a named type with an
7521 // unexported field.
7523 // This ensures that unexported fields cannot be modified by other packages.
7524 func TestUnaddressableField(t *testing.T) {
7525 var b Buffer // type defined in reflect, a different package
7526 var localBuffer struct {
7529 lv := ValueOf(&localBuffer).Elem()
7531 shouldPanic("Set", func() {
7540 type Talias1 struct {
7548 type Talias2 struct {
7553 func TestAliasNames(t *testing.T) {
7554 t1 := Talias1{byte: 1, uint8: 2, int: 3, int32: 4, rune: 5}
7555 out := fmt.Sprintf("%#v", t1)
7556 want := "reflect_test.Talias1{byte:0x1, uint8:0x2, int:3, int32:4, rune:5}"
7558 t.Errorf("Talias1 print:\nhave: %s\nwant: %s", out, want)
7561 t2 := Talias2{Tint: 1, Tint2: 2}
7562 out = fmt.Sprintf("%#v", t2)
7563 want = "reflect_test.Talias2{Tint:1, Tint2:2}"
7565 t.Errorf("Talias2 print:\nhave: %s\nwant: %s", out, want)
7569 func TestIssue22031(t *testing.T) {
7570 type s []struct{ C int }
7573 type t2 struct{ f s }
7576 ValueOf(t1{s{{}}}).Field(0).Index(0).Field(0),
7577 ValueOf(t2{s{{}}}).Field(0).Index(0).Field(0),
7580 for i, test := range tests {
7582 t.Errorf("%d: CanSet: got true, want false", i)
7587 type NonExportedFirst int
7589 func (i NonExportedFirst) ΦExported() {}
7590 func (i NonExportedFirst) nonexported() int { panic("wrong") }
7592 func TestIssue22073(t *testing.T) {
7593 m := ValueOf(NonExportedFirst(0)).Method(0)
7595 if got := m.Type().NumOut(); got != 0 {
7596 t.Errorf("NumOut: got %v, want 0", got)
7603 func TestMapIterNonEmptyMap(t *testing.T) {
7604 m := map[string]int{"one": 1, "two": 2, "three": 3}
7605 iter := ValueOf(m).MapRange()
7606 if got, want := iterateToString(iter), `[one: 1, three: 3, two: 2]`; got != want {
7607 t.Errorf("iterator returned %s (after sorting), want %s", got, want)
7611 func TestMapIterNilMap(t *testing.T) {
7612 var m map[string]int
7613 iter := ValueOf(m).MapRange()
7614 if got, want := iterateToString(iter), `[]`; got != want {
7615 t.Errorf("non-empty result iteratoring nil map: %s", got)
7619 func TestMapIterReset(t *testing.T) {
7620 iter := new(MapIter)
7622 // Use of zero iterator should panic.
7624 defer func() { recover() }()
7626 t.Error("Next did not panic")
7629 // Reset to new Map should work.
7630 m := map[string]int{"one": 1, "two": 2, "three": 3}
7631 iter.Reset(ValueOf(m))
7632 if got, want := iterateToString(iter), `[one: 1, three: 3, two: 2]`; got != want {
7633 t.Errorf("iterator returned %s (after sorting), want %s", got, want)
7636 // Reset to Zero value should work, but iterating over it should panic.
7639 defer func() { recover() }()
7641 t.Error("Next did not panic")
7644 // Reset to a different Map with different types should work.
7645 m2 := map[int]string{1: "one", 2: "two", 3: "three"}
7646 iter.Reset(ValueOf(m2))
7647 if got, want := iterateToString(iter), `[1: one, 2: two, 3: three]`; got != want {
7648 t.Errorf("iterator returned %s (after sorting), want %s", got, want)
7651 // Check that Reset, Next, and SetKey/SetValue play nicely together.
7652 m3 := map[uint64]uint64{
7657 kv := New(TypeOf(uint64(0))).Elem()
7658 for i := 0; i < 5; i++ {
7659 var seenk, seenv uint64
7660 iter.Reset(ValueOf(m3))
7664 kv.SetIterValue(iter)
7668 t.Errorf("iteration yielded keys %b, want %b", seenk, 0b111)
7670 if seenv != 0b1110 {
7671 t.Errorf("iteration yielded values %b, want %b", seenv, 0b1110)
7675 // Reset should not allocate.
7676 n := int(testing.AllocsPerRun(10, func() {
7677 iter.Reset(ValueOf(m2))
7681 t.Errorf("MapIter.Reset allocated %d times", n)
7685 func TestMapIterSafety(t *testing.T) {
7686 // Using a zero MapIter causes a panic, but not a crash.
7688 defer func() { recover() }()
7690 t.Fatal("Key did not panic")
7693 defer func() { recover() }()
7694 new(MapIter).Value()
7695 t.Fatal("Value did not panic")
7698 defer func() { recover() }()
7700 t.Fatal("Next did not panic")
7703 // Calling Key/Value on a MapIter before Next
7704 // causes a panic, but not a crash.
7705 var m map[string]int
7706 iter := ValueOf(m).MapRange()
7709 defer func() { recover() }()
7711 t.Fatal("Key did not panic")
7714 defer func() { recover() }()
7716 t.Fatal("Value did not panic")
7719 // Calling Next, Key, or Value on an exhausted iterator
7720 // causes a panic, but not a crash.
7721 iter.Next() // -> false
7723 defer func() { recover() }()
7725 t.Fatal("Key did not panic")
7728 defer func() { recover() }()
7730 t.Fatal("Value did not panic")
7733 defer func() { recover() }()
7735 t.Fatal("Next did not panic")
7739 func TestMapIterNext(t *testing.T) {
7740 // The first call to Next should reflect any
7741 // insertions to the map since the iterator was created.
7742 m := map[string]int{}
7743 iter := ValueOf(m).MapRange()
7745 if got, want := iterateToString(iter), `[one: 1]`; got != want {
7746 t.Errorf("iterator returned deleted elements: got %s, want %s", got, want)
7750 func TestMapIterDelete0(t *testing.T) {
7751 // Delete all elements before first iteration.
7752 m := map[string]int{"one": 1, "two": 2, "three": 3}
7753 iter := ValueOf(m).MapRange()
7757 if got, want := iterateToString(iter), `[]`; got != want {
7758 t.Errorf("iterator returned deleted elements: got %s, want %s", got, want)
7762 func TestMapIterDelete1(t *testing.T) {
7763 // Delete all elements after first iteration.
7764 m := map[string]int{"one": 1, "two": 2, "three": 3}
7765 iter := ValueOf(m).MapRange()
7768 got = append(got, fmt.Sprint(iter.Key(), iter.Value()))
7774 t.Errorf("iterator returned wrong number of elements: got %d, want 1", len(got))
7778 // iterateToString returns the set of elements
7779 // returned by an iterator in readable form.
7780 func iterateToString(it *MapIter) string {
7783 line := fmt.Sprintf("%v: %v", it.Key(), it.Value())
7784 got = append(got, line)
7787 return "[" + strings.Join(got, ", ") + "]"
7790 func TestConvertibleTo(t *testing.T) {
7791 t1 := ValueOf(example1.MyStruct{}).Type()
7792 t2 := ValueOf(example2.MyStruct{}).Type()
7794 // Shouldn't raise stack overflow
7795 if t1.ConvertibleTo(t2) {
7796 t.Fatalf("(%s).ConvertibleTo(%s) = true, want false", t1, t2)
7799 t3 := ValueOf([]example1.MyStruct{}).Type()
7800 t4 := ValueOf([]example2.MyStruct{}).Type()
7802 if t3.ConvertibleTo(t4) {
7803 t.Fatalf("(%s).ConvertibleTo(%s) = true, want false", t3, t4)
7807 func TestSetIter(t *testing.T) {
7808 data := map[string]int{
7816 k := New(TypeOf("")).Elem()
7817 v := New(TypeOf(0)).Elem()
7818 shouldPanic("Value.SetIterKey called before Next", func() {
7821 shouldPanic("Value.SetIterValue called before Next", func() {
7824 data2 := map[string]int{}
7828 data2[k.Interface().(string)] = v.Interface().(int)
7830 if !DeepEqual(data, data2) {
7831 t.Errorf("maps not equal, got %v want %v", data2, data)
7833 shouldPanic("Value.SetIterKey called on exhausted iterator", func() {
7836 shouldPanic("Value.SetIterValue called on exhausted iterator", func() {
7842 shouldPanic("Value.SetIterKey using unaddressable value", func() {
7843 ValueOf("").SetIterKey(i)
7845 shouldPanic("Value.SetIterValue using unaddressable value", func() {
7846 ValueOf(0).SetIterValue(i)
7848 shouldPanic("value of type string is not assignable to type int", func() {
7849 New(TypeOf(0)).Elem().SetIterKey(i)
7851 shouldPanic("value of type int is not assignable to type string", func() {
7852 New(TypeOf("")).Elem().SetIterValue(i)
7855 // Make sure assignment conversion works.
7857 y := ValueOf(&x).Elem()
7859 if _, ok := data[x.(string)]; !ok {
7860 t.Errorf("got key %s which is not in map", x)
7863 if x.(int) < 1 || x.(int) > 3 {
7864 t.Errorf("got value %d which is not in map", x)
7867 // Try some key/value types which are direct interfaces.
7870 pp := map[*int]*int{
7873 i = ValueOf(pp).MapRange()
7876 if got := *y.Interface().(*int); got != a {
7877 t.Errorf("pointer incorrect: got %d want %d", got, a)
7880 if got := *y.Interface().(*int); got != b {
7881 t.Errorf("pointer incorrect: got %d want %d", got, b)
7884 // Make sure we panic assigning from an unexported field.
7885 m = ValueOf(struct{ m map[string]int }{data}).Field(0)
7886 for iter := m.MapRange(); iter.Next(); {
7887 shouldPanic("using value obtained using unexported field", func() {
7890 shouldPanic("using value obtained using unexported field", func() {
7891 v.SetIterValue(iter)
7896 func TestMethodCallValueCodePtr(t *testing.T) {
7897 m := ValueOf(Point{}).Method(1)
7898 want := MethodValueCallCodePtr()
7899 if got := uintptr(m.UnsafePointer()); got != want {
7900 t.Errorf("methodValueCall code pointer mismatched, want: %v, got: %v", want, got)
7902 if got := m.Pointer(); got != want {
7903 t.Errorf("methodValueCall code pointer mismatched, want: %v, got: %v", want, got)
7908 type B[T any] struct{}
7910 func TestIssue50208(t *testing.T) {
7911 want1 := "B[reflect_test.A]"
7912 if got := TypeOf(new(B[A])).Elem().Name(); got != want1 {
7913 t.Errorf("name of type parameter mismatched, want:%s, got:%s", want1, got)
7915 want2 := "B[reflect_test.B[reflect_test.A]]"
7916 if got := TypeOf(new(B[B[A]])).Elem().Name(); got != want2 {
7917 t.Errorf("name of type parameter mismatched, want:%s, got:%s", want2, got)
7921 func TestNegativeKindString(t *testing.T) {
7923 s := Kind(x).String()
7926 t.Fatalf("Kind(-1).String() = %q, want %q", s, want)
7935 func TestValue_Cap(t *testing.T) {
7936 a := &[3]int{1, 2, 3}
7938 if v.Cap() != cap(a) {
7939 t.Errorf("Cap = %d want %d", v.Cap(), cap(a))
7944 if v.Cap() != cap(a) {
7945 t.Errorf("Cap = %d want %d", v.Cap(), cap(a))
7948 getError := func(f func()) (errorStr string) {
7951 if str, ok := e.(string); ok {
7958 e := getError(func() {
7962 wantStr := "reflect: call of reflect.Value.Cap on ptr to non-array Value"
7964 t.Errorf("error is %q, want %q", e, wantStr)
7968 func TestValue_Len(t *testing.T) {
7969 a := &[3]int{1, 2, 3}
7971 if v.Len() != len(a) {
7972 t.Errorf("Len = %d want %d", v.Len(), len(a))
7977 if v.Len() != len(a) {
7978 t.Errorf("Len = %d want %d", v.Len(), len(a))
7981 getError := func(f func()) (errorStr string) {
7984 if str, ok := e.(string); ok {
7991 e := getError(func() {
7995 wantStr := "reflect: call of reflect.Value.Len on ptr to non-array Value"
7997 t.Errorf("error is %q, want %q", e, wantStr)
8001 func TestValue_Comparable(t *testing.T) {
8004 var i interface{} = a
8005 var iSlice interface{} = s
8006 var iArrayFalse interface{} = [2]interface{}{1, map[int]int{}}
8007 var iArrayTrue interface{} = [2]interface{}{1, struct{ I interface{} }{1}}
8008 var testcases = []struct {
8059 ValueOf(float32(1)),
8064 ValueOf(float64(1)),
8069 ValueOf(complex(float32(1), float32(1))),
8074 ValueOf(complex(float64(1), float64(1))),
8089 ValueOf(map[int]int{}),
8129 ValueOf([2]map[int]int{}),
8134 ValueOf([0]func(){}),
8139 ValueOf([2]struct{ I interface{} }{{1}, {1}}),
8144 ValueOf([2]struct{ I interface{} }{{[]int{}}, {1}}),
8149 ValueOf([2]interface{}{1, struct{ I int }{1}}),
8154 ValueOf([2]interface{}{[1]interface{}{map[int]int{}}, struct{ I int }{1}}),
8159 ValueOf(&iArrayFalse),
8164 ValueOf(&iArrayTrue),
8170 for _, cas := range testcases {
8175 got := v.Comparable()
8176 if got != cas.comparable {
8177 t.Errorf("%T.Comparable = %t, want %t", v, got, cas.comparable)
8182 type ValueEqualTest struct {
8188 var equalI interface{} = 1
8189 var equalSlice interface{} = []int{1}
8190 var nilInterface interface{}
8191 var mapInterface interface{} = map[int]int{}
8193 var valueEqualTests = []ValueEqualTest{
8240 uint16(1), uint16(1),
8245 uint32(1), uint32(1),
8250 uint64(1), uint64(1),
8255 float32(1), float32(1),
8260 float64(1), float64(1),
8265 complex(1, 1), complex(1, 1),
8270 complex128(1 + 1i), complex128(1 + 1i),
8285 (chan int)(nil), nil,
8290 (chan int)(nil), (chan int)(nil),
8300 struct{ i int }{1}, struct{ i int }{1},
8305 struct{ i int }{1}, struct{ i int }{2},
8310 &nilInterface, &nilInterface,
8315 1, ValueOf(struct{ i int }{1}).Field(0),
8321 func TestValue_Equal(t *testing.T) {
8322 for _, test := range valueEqualTests {
8324 if vv, ok := test.v.(Value); ok {
8330 if uu, ok := test.u.(Value); ok {
8343 if r := v.Equal(u); r != test.eq {
8344 t.Errorf("%s == %s got %t, want %t", v.Type(), u.Type(), r, test.eq)
8349 func TestValue_EqualNonComparable(t *testing.T) {
8350 var invalid = Value{} // ValueOf(nil)
8351 var values = []Value{
8352 // Value of slice is non-comparable.
8353 ValueOf([]int(nil)),
8356 // Value of map is non-comparable.
8357 ValueOf(map[int]int(nil)),
8358 ValueOf((map[int]int{})),
8360 // Value of func is non-comparable.
8361 ValueOf(((func())(nil))),
8364 // Value of struct is non-comparable because of non-comparable elements.
8365 ValueOf((NonComparableStruct{})),
8367 // Value of array is non-comparable because of non-comparable elements.
8368 ValueOf([0]map[int]int{}),
8369 ValueOf([0]func(){}),
8370 ValueOf(([1]struct{ I interface{} }{{[]int{}}})),
8371 ValueOf(([1]interface{}{[1]interface{}{map[int]int{}}})),
8373 for _, value := range values {
8374 // Panic when reflect.Value.Equal using two valid non-comparable values.
8375 shouldPanic("are not comparable", func() { value.Equal(value) })
8377 // If one is non-comparable and the other is invalid, the expected result is always false.
8378 if r := value.Equal(invalid); r != false {
8379 t.Errorf("%s == invalid got %t, want false", value.Type(), r)
8384 func TestInitFuncTypes(t *testing.T) {
8386 var wg sync.WaitGroup
8389 for i := 0; i < n; i++ {
8392 ipT := TypeOf(net.IP{})
8393 for i := 0; i < ipT.NumMethod(); i++ {
8401 func TestClear(t *testing.T) {
8402 m := make(map[string]any, len(valueTests))
8403 for _, tt := range valueTests {
8406 mapTestFn := func(v Value) bool { v.Clear(); return v.Len() == 0 }
8408 s := make([]*pair, len(valueTests))
8410 s[i] = &valueTests[i]
8412 sliceTestFn := func(v Value) bool {
8414 for i := 0; i < v.Len(); i++ {
8415 if !v.Index(i).IsZero() {
8422 panicTestFn := func(v Value) bool { shouldPanic("reflect.Value.Clear", func() { v.Clear() }); return true }
8427 testFunc func(v Value) bool
8429 {"map", ValueOf(m), mapTestFn},
8430 {"slice no pointer", ValueOf([]int{1, 2, 3, 4, 5}), sliceTestFn},
8431 {"slice has pointer", ValueOf(s), sliceTestFn},
8432 {"non-map/slice", ValueOf(1), panicTestFn},
8435 for _, tc := range tests {
8437 t.Run(tc.name, func(t *testing.T) {
8439 if !tc.testFunc(tc.value) {
8440 t.Errorf("unexpected result for value.Clear(): %value", tc.value)