| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package reflect_test |
| |
| import ( |
| "bytes" |
| "encoding/base64" |
| "flag" |
| "fmt" |
| "go/token" |
| "io" |
| "math" |
| "math/rand" |
| "os" |
| . "reflect" |
| "runtime" |
| "sort" |
| "strconv" |
| "strings" |
| "sync" |
| "sync/atomic" |
| "testing" |
| "time" |
| "unsafe" |
| ) |
| |
| var sink interface{} |
| |
| func TestBool(t *testing.T) { |
| v := ValueOf(true) |
| if v.Bool() != true { |
| t.Fatal("ValueOf(true).Bool() = false") |
| } |
| } |
| |
| type integer int |
| type T struct { |
| a int |
| b float64 |
| c string |
| d *int |
| } |
| |
| type pair struct { |
| i interface{} |
| s string |
| } |
| |
| func assert(t *testing.T, s, want string) { |
| if s != want { |
| t.Errorf("have %#q want %#q", s, want) |
| } |
| } |
| |
| var typeTests = []pair{ |
| {struct{ x int }{}, "int"}, |
| {struct{ x int8 }{}, "int8"}, |
| {struct{ x int16 }{}, "int16"}, |
| {struct{ x int32 }{}, "int32"}, |
| {struct{ x int64 }{}, "int64"}, |
| {struct{ x uint }{}, "uint"}, |
| {struct{ x uint8 }{}, "uint8"}, |
| {struct{ x uint16 }{}, "uint16"}, |
| {struct{ x uint32 }{}, "uint32"}, |
| {struct{ x uint64 }{}, "uint64"}, |
| {struct{ x float32 }{}, "float32"}, |
| {struct{ x float64 }{}, "float64"}, |
| {struct{ x int8 }{}, "int8"}, |
| {struct{ x (**int8) }{}, "**int8"}, |
| {struct{ x (**integer) }{}, "**reflect_test.integer"}, |
| {struct{ x ([32]int32) }{}, "[32]int32"}, |
| {struct{ x ([]int8) }{}, "[]int8"}, |
| {struct{ x (map[string]int32) }{}, "map[string]int32"}, |
| {struct{ x (chan<- string) }{}, "chan<- string"}, |
| {struct{ x (chan<- chan string) }{}, "chan<- chan string"}, |
| {struct{ x (chan<- <-chan string) }{}, "chan<- <-chan string"}, |
| {struct{ x (<-chan <-chan string) }{}, "<-chan <-chan string"}, |
| {struct{ x (chan (<-chan string)) }{}, "chan (<-chan string)"}, |
| {struct { |
| x struct { |
| c chan *int32 |
| d float32 |
| } |
| }{}, |
| "struct { c chan *int32; d float32 }", |
| }, |
| {struct{ x (func(a int8, b int32)) }{}, "func(int8, int32)"}, |
| {struct { |
| x struct { |
| c func(chan *integer, *int8) |
| } |
| }{}, |
| "struct { c func(chan *reflect_test.integer, *int8) }", |
| }, |
| {struct { |
| x struct { |
| a int8 |
| b int32 |
| } |
| }{}, |
| "struct { a int8; b int32 }", |
| }, |
| {struct { |
| x struct { |
| a int8 |
| b int8 |
| c int32 |
| } |
| }{}, |
| "struct { a int8; b int8; c int32 }", |
| }, |
| {struct { |
| x struct { |
| a int8 |
| b int8 |
| c int8 |
| d int32 |
| } |
| }{}, |
| "struct { a int8; b int8; c int8; d int32 }", |
| }, |
| {struct { |
| x struct { |
| a int8 |
| b int8 |
| c int8 |
| d int8 |
| e int32 |
| } |
| }{}, |
| "struct { a int8; b int8; c int8; d int8; e int32 }", |
| }, |
| {struct { |
| x struct { |
| a int8 |
| b int8 |
| c int8 |
| d int8 |
| e int8 |
| f int32 |
| } |
| }{}, |
| "struct { a int8; b int8; c int8; d int8; e int8; f int32 }", |
| }, |
| {struct { |
| x struct { |
| a int8 `reflect:"hi there"` |
| } |
| }{}, |
| `struct { a int8 "reflect:\"hi there\"" }`, |
| }, |
| {struct { |
| x struct { |
| a int8 `reflect:"hi \x00there\t\n\"\\"` |
| } |
| }{}, |
| `struct { a int8 "reflect:\"hi \\x00there\\t\\n\\\"\\\\\"" }`, |
| }, |
| {struct { |
| x struct { |
| f func(args ...int) |
| } |
| }{}, |
| "struct { f func(...int) }", |
| }, |
| {struct { |
| x (interface { |
| a(func(func(int) int) func(func(int)) int) |
| b() |
| }) |
| }{}, |
| "interface { reflect_test.a(func(func(int) int) func(func(int)) int); reflect_test.b() }", |
| }, |
| {struct { |
| x struct { |
| int32 |
| int64 |
| } |
| }{}, |
| "struct { int32; int64 }", |
| }, |
| } |
| |
| var valueTests = []pair{ |
| {new(int), "132"}, |
| {new(int8), "8"}, |
| {new(int16), "16"}, |
| {new(int32), "32"}, |
| {new(int64), "64"}, |
| {new(uint), "132"}, |
| {new(uint8), "8"}, |
| {new(uint16), "16"}, |
| {new(uint32), "32"}, |
| {new(uint64), "64"}, |
| {new(float32), "256.25"}, |
| {new(float64), "512.125"}, |
| {new(complex64), "532.125+10i"}, |
| {new(complex128), "564.25+1i"}, |
| {new(string), "stringy cheese"}, |
| {new(bool), "true"}, |
| {new(*int8), "*int8(0)"}, |
| {new(**int8), "**int8(0)"}, |
| {new([5]int32), "[5]int32{0, 0, 0, 0, 0}"}, |
| {new(**integer), "**reflect_test.integer(0)"}, |
| {new(map[string]int32), "map[string]int32{<can't iterate on maps>}"}, |
| {new(chan<- string), "chan<- string"}, |
| {new(func(a int8, b int32)), "func(int8, int32)(0)"}, |
| {new(struct { |
| c chan *int32 |
| d float32 |
| }), |
| "struct { c chan *int32; d float32 }{chan *int32, 0}", |
| }, |
| {new(struct{ c func(chan *integer, *int8) }), |
| "struct { c func(chan *reflect_test.integer, *int8) }{func(chan *reflect_test.integer, *int8)(0)}", |
| }, |
| {new(struct { |
| a int8 |
| b int32 |
| }), |
| "struct { a int8; b int32 }{0, 0}", |
| }, |
| {new(struct { |
| a int8 |
| b int8 |
| c int32 |
| }), |
| "struct { a int8; b int8; c int32 }{0, 0, 0}", |
| }, |
| } |
| |
| func testType(t *testing.T, i int, typ Type, want string) { |
| s := typ.String() |
| if s != want { |
| t.Errorf("#%d: have %#q, want %#q", i, s, want) |
| } |
| } |
| |
| func TestTypes(t *testing.T) { |
| for i, tt := range typeTests { |
| testType(t, i, ValueOf(tt.i).Field(0).Type(), tt.s) |
| } |
| } |
| |
| func TestSet(t *testing.T) { |
| for i, tt := range valueTests { |
| v := ValueOf(tt.i) |
| v = v.Elem() |
| switch v.Kind() { |
| case Int: |
| v.SetInt(132) |
| case Int8: |
| v.SetInt(8) |
| case Int16: |
| v.SetInt(16) |
| case Int32: |
| v.SetInt(32) |
| case Int64: |
| v.SetInt(64) |
| case Uint: |
| v.SetUint(132) |
| case Uint8: |
| v.SetUint(8) |
| case Uint16: |
| v.SetUint(16) |
| case Uint32: |
| v.SetUint(32) |
| case Uint64: |
| v.SetUint(64) |
| case Float32: |
| v.SetFloat(256.25) |
| case Float64: |
| v.SetFloat(512.125) |
| case Complex64: |
| v.SetComplex(532.125 + 10i) |
| case Complex128: |
| v.SetComplex(564.25 + 1i) |
| case String: |
| v.SetString("stringy cheese") |
| case Bool: |
| v.SetBool(true) |
| } |
| s := valueToString(v) |
| if s != tt.s { |
| t.Errorf("#%d: have %#q, want %#q", i, s, tt.s) |
| } |
| } |
| } |
| |
| func TestSetValue(t *testing.T) { |
| for i, tt := range valueTests { |
| v := ValueOf(tt.i).Elem() |
| switch v.Kind() { |
| case Int: |
| v.Set(ValueOf(int(132))) |
| case Int8: |
| v.Set(ValueOf(int8(8))) |
| case Int16: |
| v.Set(ValueOf(int16(16))) |
| case Int32: |
| v.Set(ValueOf(int32(32))) |
| case Int64: |
| v.Set(ValueOf(int64(64))) |
| case Uint: |
| v.Set(ValueOf(uint(132))) |
| case Uint8: |
| v.Set(ValueOf(uint8(8))) |
| case Uint16: |
| v.Set(ValueOf(uint16(16))) |
| case Uint32: |
| v.Set(ValueOf(uint32(32))) |
| case Uint64: |
| v.Set(ValueOf(uint64(64))) |
| case Float32: |
| v.Set(ValueOf(float32(256.25))) |
| case Float64: |
| v.Set(ValueOf(512.125)) |
| case Complex64: |
| v.Set(ValueOf(complex64(532.125 + 10i))) |
| case Complex128: |
| v.Set(ValueOf(complex128(564.25 + 1i))) |
| case String: |
| v.Set(ValueOf("stringy cheese")) |
| case Bool: |
| v.Set(ValueOf(true)) |
| } |
| s := valueToString(v) |
| if s != tt.s { |
| t.Errorf("#%d: have %#q, want %#q", i, s, tt.s) |
| } |
| } |
| } |
| |
| func TestCanSetField(t *testing.T) { |
| type embed struct{ x, X int } |
| type Embed struct{ x, X int } |
| type S1 struct { |
| embed |
| x, X int |
| } |
| type S2 struct { |
| *embed |
| x, X int |
| } |
| type S3 struct { |
| Embed |
| x, X int |
| } |
| type S4 struct { |
| *Embed |
| x, X int |
| } |
| |
| type testCase struct { |
| // -1 means Addr().Elem() of current value |
| index []int |
| canSet bool |
| } |
| tests := []struct { |
| val Value |
| cases []testCase |
| }{{ |
| val: ValueOf(&S1{}), |
| cases: []testCase{ |
| {[]int{0}, false}, |
| {[]int{0, -1}, false}, |
| {[]int{0, 0}, false}, |
| {[]int{0, 0, -1}, false}, |
| {[]int{0, -1, 0}, false}, |
| {[]int{0, -1, 0, -1}, false}, |
| {[]int{0, 1}, true}, |
| {[]int{0, 1, -1}, true}, |
| {[]int{0, -1, 1}, true}, |
| {[]int{0, -1, 1, -1}, true}, |
| {[]int{1}, false}, |
| {[]int{1, -1}, false}, |
| {[]int{2}, true}, |
| {[]int{2, -1}, true}, |
| }, |
| }, { |
| val: ValueOf(&S2{embed: &embed{}}), |
| cases: []testCase{ |
| {[]int{0}, false}, |
| {[]int{0, -1}, false}, |
| {[]int{0, 0}, false}, |
| {[]int{0, 0, -1}, false}, |
| {[]int{0, -1, 0}, false}, |
| {[]int{0, -1, 0, -1}, false}, |
| {[]int{0, 1}, true}, |
| {[]int{0, 1, -1}, true}, |
| {[]int{0, -1, 1}, true}, |
| {[]int{0, -1, 1, -1}, true}, |
| {[]int{1}, false}, |
| {[]int{2}, true}, |
| }, |
| }, { |
| val: ValueOf(&S3{}), |
| cases: []testCase{ |
| {[]int{0}, true}, |
| {[]int{0, -1}, true}, |
| {[]int{0, 0}, false}, |
| {[]int{0, 0, -1}, false}, |
| {[]int{0, -1, 0}, false}, |
| {[]int{0, -1, 0, -1}, false}, |
| {[]int{0, 1}, true}, |
| {[]int{0, 1, -1}, true}, |
| {[]int{0, -1, 1}, true}, |
| {[]int{0, -1, 1, -1}, true}, |
| {[]int{1}, false}, |
| {[]int{2}, true}, |
| }, |
| }, { |
| val: ValueOf(&S4{Embed: &Embed{}}), |
| cases: []testCase{ |
| {[]int{0}, true}, |
| {[]int{0, -1}, true}, |
| {[]int{0, 0}, false}, |
| {[]int{0, 0, -1}, false}, |
| {[]int{0, -1, 0}, false}, |
| {[]int{0, -1, 0, -1}, false}, |
| {[]int{0, 1}, true}, |
| {[]int{0, 1, -1}, true}, |
| {[]int{0, -1, 1}, true}, |
| {[]int{0, -1, 1, -1}, true}, |
| {[]int{1}, false}, |
| {[]int{2}, true}, |
| }, |
| }} |
| |
| for _, tt := range tests { |
| t.Run(tt.val.Type().Name(), func(t *testing.T) { |
| for _, tc := range tt.cases { |
| f := tt.val |
| for _, i := range tc.index { |
| if f.Kind() == Ptr { |
| f = f.Elem() |
| } |
| if i == -1 { |
| f = f.Addr().Elem() |
| } else { |
| f = f.Field(i) |
| } |
| } |
| if got := f.CanSet(); got != tc.canSet { |
| t.Errorf("CanSet() = %v, want %v", got, tc.canSet) |
| } |
| } |
| }) |
| } |
| } |
| |
| var _i = 7 |
| |
| var valueToStringTests = []pair{ |
| {123, "123"}, |
| {123.5, "123.5"}, |
| {byte(123), "123"}, |
| {"abc", "abc"}, |
| {T{123, 456.75, "hello", &_i}, "reflect_test.T{123, 456.75, hello, *int(&7)}"}, |
| {new(chan *T), "*chan *reflect_test.T(&chan *reflect_test.T)"}, |
| {[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"}, |
| {&[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})"}, |
| {[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"}, |
| {&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[]int(&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"}, |
| } |
| |
| func TestValueToString(t *testing.T) { |
| for i, test := range valueToStringTests { |
| s := valueToString(ValueOf(test.i)) |
| if s != test.s { |
| t.Errorf("#%d: have %#q, want %#q", i, s, test.s) |
| } |
| } |
| } |
| |
| func TestArrayElemSet(t *testing.T) { |
| v := ValueOf(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}).Elem() |
| v.Index(4).SetInt(123) |
| s := valueToString(v) |
| const want = "[10]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}" |
| if s != want { |
| t.Errorf("[10]int: have %#q want %#q", s, want) |
| } |
| |
| v = ValueOf([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}) |
| v.Index(4).SetInt(123) |
| s = valueToString(v) |
| const want1 = "[]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}" |
| if s != want1 { |
| t.Errorf("[]int: have %#q want %#q", s, want1) |
| } |
| } |
| |
| func TestPtrPointTo(t *testing.T) { |
| var ip *int32 |
| var i int32 = 1234 |
| vip := ValueOf(&ip) |
| vi := ValueOf(&i).Elem() |
| vip.Elem().Set(vi.Addr()) |
| if *ip != 1234 { |
| t.Errorf("got %d, want 1234", *ip) |
| } |
| |
| ip = nil |
| vp := ValueOf(&ip).Elem() |
| vp.Set(Zero(vp.Type())) |
| if ip != nil { |
| t.Errorf("got non-nil (%p), want nil", ip) |
| } |
| } |
| |
| func TestPtrSetNil(t *testing.T) { |
| var i int32 = 1234 |
| ip := &i |
| vip := ValueOf(&ip) |
| vip.Elem().Set(Zero(vip.Elem().Type())) |
| if ip != nil { |
| t.Errorf("got non-nil (%d), want nil", *ip) |
| } |
| } |
| |
| func TestMapSetNil(t *testing.T) { |
| m := make(map[string]int) |
| vm := ValueOf(&m) |
| vm.Elem().Set(Zero(vm.Elem().Type())) |
| if m != nil { |
| t.Errorf("got non-nil (%p), want nil", m) |
| } |
| } |
| |
| func TestAll(t *testing.T) { |
| testType(t, 1, TypeOf((int8)(0)), "int8") |
| testType(t, 2, TypeOf((*int8)(nil)).Elem(), "int8") |
| |
| typ := TypeOf((*struct { |
| c chan *int32 |
| d float32 |
| })(nil)) |
| testType(t, 3, typ, "*struct { c chan *int32; d float32 }") |
| etyp := typ.Elem() |
| testType(t, 4, etyp, "struct { c chan *int32; d float32 }") |
| styp := etyp |
| f := styp.Field(0) |
| testType(t, 5, f.Type, "chan *int32") |
| |
| f, present := styp.FieldByName("d") |
| if !present { |
| t.Errorf("FieldByName says present field is absent") |
| } |
| testType(t, 6, f.Type, "float32") |
| |
| f, present = styp.FieldByName("absent") |
| if present { |
| t.Errorf("FieldByName says absent field is present") |
| } |
| |
| typ = TypeOf([32]int32{}) |
| testType(t, 7, typ, "[32]int32") |
| testType(t, 8, typ.Elem(), "int32") |
| |
| typ = TypeOf((map[string]*int32)(nil)) |
| testType(t, 9, typ, "map[string]*int32") |
| mtyp := typ |
| testType(t, 10, mtyp.Key(), "string") |
| testType(t, 11, mtyp.Elem(), "*int32") |
| |
| typ = TypeOf((chan<- string)(nil)) |
| testType(t, 12, typ, "chan<- string") |
| testType(t, 13, typ.Elem(), "string") |
| |
| // make sure tag strings are not part of element type |
| typ = TypeOf(struct { |
| d []uint32 `reflect:"TAG"` |
| }{}).Field(0).Type |
| testType(t, 14, typ, "[]uint32") |
| } |
| |
| func TestInterfaceGet(t *testing.T) { |
| var inter struct { |
| E interface{} |
| } |
| inter.E = 123.456 |
| v1 := ValueOf(&inter) |
| v2 := v1.Elem().Field(0) |
| assert(t, v2.Type().String(), "interface {}") |
| i2 := v2.Interface() |
| v3 := ValueOf(i2) |
| assert(t, v3.Type().String(), "float64") |
| } |
| |
| func TestInterfaceValue(t *testing.T) { |
| var inter struct { |
| E interface{} |
| } |
| inter.E = 123.456 |
| v1 := ValueOf(&inter) |
| v2 := v1.Elem().Field(0) |
| assert(t, v2.Type().String(), "interface {}") |
| v3 := v2.Elem() |
| assert(t, v3.Type().String(), "float64") |
| |
| i3 := v2.Interface() |
| if _, ok := i3.(float64); !ok { |
| t.Error("v2.Interface() did not return float64, got ", TypeOf(i3)) |
| } |
| } |
| |
| func TestFunctionValue(t *testing.T) { |
| var x interface{} = func() {} |
| v := ValueOf(x) |
| if fmt.Sprint(v.Interface()) != fmt.Sprint(x) { |
| t.Fatalf("TestFunction returned wrong pointer") |
| } |
| assert(t, v.Type().String(), "func()") |
| } |
| |
| var appendTests = []struct { |
| orig, extra []int |
| }{ |
| {make([]int, 2, 4), []int{22}}, |
| {make([]int, 2, 4), []int{22, 33, 44}}, |
| } |
| |
| func sameInts(x, y []int) bool { |
| if len(x) != len(y) { |
| return false |
| } |
| for i, xx := range x { |
| if xx != y[i] { |
| return false |
| } |
| } |
| return true |
| } |
| |
| func TestAppend(t *testing.T) { |
| for i, test := range appendTests { |
| origLen, extraLen := len(test.orig), len(test.extra) |
| want := append(test.orig, test.extra...) |
| // Convert extra from []int to []Value. |
| e0 := make([]Value, len(test.extra)) |
| for j, e := range test.extra { |
| e0[j] = ValueOf(e) |
| } |
| // Convert extra from []int to *SliceValue. |
| e1 := ValueOf(test.extra) |
| // Test Append. |
| a0 := ValueOf(test.orig) |
| have0 := Append(a0, e0...).Interface().([]int) |
| if !sameInts(have0, want) { |
| t.Errorf("Append #%d: have %v, want %v (%p %p)", i, have0, want, test.orig, have0) |
| } |
| // Check that the orig and extra slices were not modified. |
| if len(test.orig) != origLen { |
| t.Errorf("Append #%d origLen: have %v, want %v", i, len(test.orig), origLen) |
| } |
| if len(test.extra) != extraLen { |
| t.Errorf("Append #%d extraLen: have %v, want %v", i, len(test.extra), extraLen) |
| } |
| // Test AppendSlice. |
| a1 := ValueOf(test.orig) |
| have1 := AppendSlice(a1, e1).Interface().([]int) |
| if !sameInts(have1, want) { |
| t.Errorf("AppendSlice #%d: have %v, want %v", i, have1, want) |
| } |
| // Check that the orig and extra slices were not modified. |
| if len(test.orig) != origLen { |
| t.Errorf("AppendSlice #%d origLen: have %v, want %v", i, len(test.orig), origLen) |
| } |
| if len(test.extra) != extraLen { |
| t.Errorf("AppendSlice #%d extraLen: have %v, want %v", i, len(test.extra), extraLen) |
| } |
| } |
| } |
| |
| func TestCopy(t *testing.T) { |
| a := []int{1, 2, 3, 4, 10, 9, 8, 7} |
| b := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} |
| c := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} |
| for i := 0; i < len(b); i++ { |
| if b[i] != c[i] { |
| t.Fatalf("b != c before test") |
| } |
| } |
| a1 := a |
| b1 := b |
| aa := ValueOf(&a1).Elem() |
| ab := ValueOf(&b1).Elem() |
| for tocopy := 1; tocopy <= 7; tocopy++ { |
| aa.SetLen(tocopy) |
| Copy(ab, aa) |
| aa.SetLen(8) |
| for i := 0; i < tocopy; i++ { |
| if a[i] != b[i] { |
| t.Errorf("(i) tocopy=%d a[%d]=%d, b[%d]=%d", |
| tocopy, i, a[i], i, b[i]) |
| } |
| } |
| for i := tocopy; i < len(b); i++ { |
| if b[i] != c[i] { |
| if i < len(a) { |
| t.Errorf("(ii) tocopy=%d a[%d]=%d, b[%d]=%d, c[%d]=%d", |
| tocopy, i, a[i], i, b[i], i, c[i]) |
| } else { |
| t.Errorf("(iii) tocopy=%d b[%d]=%d, c[%d]=%d", |
| tocopy, i, b[i], i, c[i]) |
| } |
| } else { |
| t.Logf("tocopy=%d elem %d is okay\n", tocopy, i) |
| } |
| } |
| } |
| } |
| |
| func TestCopyString(t *testing.T) { |
| t.Run("Slice", func(t *testing.T) { |
| s := bytes.Repeat([]byte{'_'}, 8) |
| val := ValueOf(s) |
| |
| n := Copy(val, ValueOf("")) |
| if expecting := []byte("________"); n != 0 || !bytes.Equal(s, expecting) { |
| t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s, expecting) |
| } |
| |
| n = Copy(val, ValueOf("hello")) |
| if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s, expecting) { |
| t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s, expecting) |
| } |
| |
| n = Copy(val, ValueOf("helloworld")) |
| if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s, expecting) { |
| t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s, expecting) |
| } |
| }) |
| t.Run("Array", func(t *testing.T) { |
| s := [...]byte{'_', '_', '_', '_', '_', '_', '_', '_'} |
| val := ValueOf(&s).Elem() |
| |
| n := Copy(val, ValueOf("")) |
| if expecting := []byte("________"); n != 0 || !bytes.Equal(s[:], expecting) { |
| t.Errorf("got n = %d, s = %s, expecting n = 0, s = %s", n, s[:], expecting) |
| } |
| |
| n = Copy(val, ValueOf("hello")) |
| if expecting := []byte("hello___"); n != 5 || !bytes.Equal(s[:], expecting) { |
| t.Errorf("got n = %d, s = %s, expecting n = 5, s = %s", n, s[:], expecting) |
| } |
| |
| n = Copy(val, ValueOf("helloworld")) |
| if expecting := []byte("hellowor"); n != 8 || !bytes.Equal(s[:], expecting) { |
| t.Errorf("got n = %d, s = %s, expecting n = 8, s = %s", n, s[:], expecting) |
| } |
| }) |
| } |
| |
| func TestCopyArray(t *testing.T) { |
| a := [8]int{1, 2, 3, 4, 10, 9, 8, 7} |
| b := [11]int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44} |
| c := b |
| aa := ValueOf(&a).Elem() |
| ab := ValueOf(&b).Elem() |
| Copy(ab, aa) |
| for i := 0; i < len(a); i++ { |
| if a[i] != b[i] { |
| t.Errorf("(i) a[%d]=%d, b[%d]=%d", i, a[i], i, b[i]) |
| } |
| } |
| for i := len(a); i < len(b); i++ { |
| if b[i] != c[i] { |
| t.Errorf("(ii) b[%d]=%d, c[%d]=%d", i, b[i], i, c[i]) |
| } else { |
| t.Logf("elem %d is okay\n", i) |
| } |
| } |
| } |
| |
| func TestBigUnnamedStruct(t *testing.T) { |
| b := struct{ a, b, c, d int64 }{1, 2, 3, 4} |
| v := ValueOf(b) |
| b1 := v.Interface().(struct { |
| a, b, c, d int64 |
| }) |
| if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d { |
| t.Errorf("ValueOf(%v).Interface().(*Big) = %v", b, b1) |
| } |
| } |
| |
| type big struct { |
| a, b, c, d, e int64 |
| } |
| |
| func TestBigStruct(t *testing.T) { |
| b := big{1, 2, 3, 4, 5} |
| v := ValueOf(b) |
| b1 := v.Interface().(big) |
| if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d || b1.e != b.e { |
| t.Errorf("ValueOf(%v).Interface().(big) = %v", b, b1) |
| } |
| } |
| |
| type Basic struct { |
| x int |
| y float32 |
| } |
| |
| type NotBasic Basic |
| |
| type DeepEqualTest struct { |
| a, b interface{} |
| eq bool |
| } |
| |
| // Simple functions for DeepEqual tests. |
| var ( |
| fn1 func() // nil. |
| fn2 func() // nil. |
| fn3 = func() { fn1() } // Not nil. |
| ) |
| |
| type self struct{} |
| |
| type Loop *Loop |
| type Loopy interface{} |
| |
| var loop1, loop2 Loop |
| var loopy1, loopy2 Loopy |
| var cycleMap1, cycleMap2, cycleMap3 map[string]interface{} |
| |
| type structWithSelfPtr struct { |
| p *structWithSelfPtr |
| s string |
| } |
| |
| func init() { |
| loop1 = &loop2 |
| loop2 = &loop1 |
| |
| loopy1 = &loopy2 |
| loopy2 = &loopy1 |
| |
| cycleMap1 = map[string]interface{}{} |
| cycleMap1["cycle"] = cycleMap1 |
| cycleMap2 = map[string]interface{}{} |
| cycleMap2["cycle"] = cycleMap2 |
| cycleMap3 = map[string]interface{}{} |
| cycleMap3["different"] = cycleMap3 |
| } |
| |
| var deepEqualTests = []DeepEqualTest{ |
| // Equalities |
| {nil, nil, true}, |
| {1, 1, true}, |
| {int32(1), int32(1), true}, |
| {0.5, 0.5, true}, |
| {float32(0.5), float32(0.5), true}, |
| {"hello", "hello", true}, |
| {make([]int, 10), make([]int, 10), true}, |
| {&[3]int{1, 2, 3}, &[3]int{1, 2, 3}, true}, |
| {Basic{1, 0.5}, Basic{1, 0.5}, true}, |
| {error(nil), error(nil), true}, |
| {map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, true}, |
| {fn1, fn2, true}, |
| |
| // Inequalities |
| {1, 2, false}, |
| {int32(1), int32(2), false}, |
| {0.5, 0.6, false}, |
| {float32(0.5), float32(0.6), false}, |
| {"hello", "hey", false}, |
| {make([]int, 10), make([]int, 11), false}, |
| {&[3]int{1, 2, 3}, &[3]int{1, 2, 4}, false}, |
| {Basic{1, 0.5}, Basic{1, 0.6}, false}, |
| {Basic{1, 0}, Basic{2, 0}, false}, |
| {map[int]string{1: "one", 3: "two"}, map[int]string{2: "two", 1: "one"}, false}, |
| {map[int]string{1: "one", 2: "txo"}, map[int]string{2: "two", 1: "one"}, false}, |
| {map[int]string{1: "one"}, map[int]string{2: "two", 1: "one"}, false}, |
| {map[int]string{2: "two", 1: "one"}, map[int]string{1: "one"}, false}, |
| {nil, 1, false}, |
| {1, nil, false}, |
| {fn1, fn3, false}, |
| {fn3, fn3, false}, |
| {[][]int{{1}}, [][]int{{2}}, false}, |
| {math.NaN(), math.NaN(), false}, |
| {&[1]float64{math.NaN()}, &[1]float64{math.NaN()}, false}, |
| {&[1]float64{math.NaN()}, self{}, true}, |
| {[]float64{math.NaN()}, []float64{math.NaN()}, false}, |
| {[]float64{math.NaN()}, self{}, true}, |
| {map[float64]float64{math.NaN(): 1}, map[float64]float64{1: 2}, false}, |
| {map[float64]float64{math.NaN(): 1}, self{}, true}, |
| {&structWithSelfPtr{p: &structWithSelfPtr{s: "a"}}, &structWithSelfPtr{p: &structWithSelfPtr{s: "b"}}, false}, |
| |
| // Nil vs empty: not the same. |
| {[]int{}, []int(nil), false}, |
| {[]int{}, []int{}, true}, |
| {[]int(nil), []int(nil), true}, |
| {map[int]int{}, map[int]int(nil), false}, |
| {map[int]int{}, map[int]int{}, true}, |
| {map[int]int(nil), map[int]int(nil), true}, |
| |
| // Mismatched types |
| {1, 1.0, false}, |
| {int32(1), int64(1), false}, |
| {0.5, "hello", false}, |
| {[]int{1, 2, 3}, [3]int{1, 2, 3}, false}, |
| {&[3]interface{}{1, 2, 4}, &[3]interface{}{1, 2, "s"}, false}, |
| {Basic{1, 0.5}, NotBasic{1, 0.5}, false}, |
| {map[uint]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, false}, |
| |
| // Possible loops. |
| {&loop1, &loop1, true}, |
| {&loop1, &loop2, true}, |
| {&loopy1, &loopy1, true}, |
| {&loopy1, &loopy2, true}, |
| {&cycleMap1, &cycleMap2, true}, |
| {&cycleMap1, &cycleMap3, false}, |
| } |
| |
| func TestDeepEqual(t *testing.T) { |
| for _, test := range deepEqualTests { |
| if test.b == (self{}) { |
| test.b = test.a |
| } |
| if r := DeepEqual(test.a, test.b); r != test.eq { |
| t.Errorf("DeepEqual(%#v, %#v) = %v, want %v", test.a, test.b, r, test.eq) |
| } |
| } |
| } |
| |
| func TestTypeOf(t *testing.T) { |
| // Special case for nil |
| if typ := TypeOf(nil); typ != nil { |
| t.Errorf("expected nil type for nil value; got %v", typ) |
| } |
| for _, test := range deepEqualTests { |
| v := ValueOf(test.a) |
| if !v.IsValid() { |
| continue |
| } |
| typ := TypeOf(test.a) |
| if typ != v.Type() { |
| t.Errorf("TypeOf(%v) = %v, but ValueOf(%v).Type() = %v", test.a, typ, test.a, v.Type()) |
| } |
| } |
| } |
| |
| type Recursive struct { |
| x int |
| r *Recursive |
| } |
| |
| func TestDeepEqualRecursiveStruct(t *testing.T) { |
| a, b := new(Recursive), new(Recursive) |
| *a = Recursive{12, a} |
| *b = Recursive{12, b} |
| if !DeepEqual(a, b) { |
| t.Error("DeepEqual(recursive same) = false, want true") |
| } |
| } |
| |
| type _Complex struct { |
| a int |
| b [3]*_Complex |
| c *string |
| d map[float64]float64 |
| } |
| |
| func TestDeepEqualComplexStruct(t *testing.T) { |
| m := make(map[float64]float64) |
| stra, strb := "hello", "hello" |
| a, b := new(_Complex), new(_Complex) |
| *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m} |
| *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m} |
| if !DeepEqual(a, b) { |
| t.Error("DeepEqual(complex same) = false, want true") |
| } |
| } |
| |
| func TestDeepEqualComplexStructInequality(t *testing.T) { |
| m := make(map[float64]float64) |
| stra, strb := "hello", "helloo" // Difference is here |
| a, b := new(_Complex), new(_Complex) |
| *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m} |
| *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m} |
| if DeepEqual(a, b) { |
| t.Error("DeepEqual(complex different) = true, want false") |
| } |
| } |
| |
| type UnexpT struct { |
| m map[int]int |
| } |
| |
| func TestDeepEqualUnexportedMap(t *testing.T) { |
| // Check that DeepEqual can look at unexported fields. |
| x1 := UnexpT{map[int]int{1: 2}} |
| x2 := UnexpT{map[int]int{1: 2}} |
| if !DeepEqual(&x1, &x2) { |
| t.Error("DeepEqual(x1, x2) = false, want true") |
| } |
| |
| y1 := UnexpT{map[int]int{2: 3}} |
| if DeepEqual(&x1, &y1) { |
| t.Error("DeepEqual(x1, y1) = true, want false") |
| } |
| } |
| |
| func check2ndField(x interface{}, offs uintptr, t *testing.T) { |
| s := ValueOf(x) |
| f := s.Type().Field(1) |
| if f.Offset != offs { |
| t.Error("mismatched offsets in structure alignment:", f.Offset, offs) |
| } |
| } |
| |
| // Check that structure alignment & offsets viewed through reflect agree with those |
| // from the compiler itself. |
| func TestAlignment(t *testing.T) { |
| type T1inner struct { |
| a int |
| } |
| type T1 struct { |
| T1inner |
| f int |
| } |
| type T2inner struct { |
| a, b int |
| } |
| type T2 struct { |
| T2inner |
| f int |
| } |
| |
| x := T1{T1inner{2}, 17} |
| check2ndField(x, uintptr(unsafe.Pointer(&x.f))-uintptr(unsafe.Pointer(&x)), t) |
| |
| x1 := T2{T2inner{2, 3}, 17} |
| check2ndField(x1, uintptr(unsafe.Pointer(&x1.f))-uintptr(unsafe.Pointer(&x1)), t) |
| } |
| |
| func Nil(a interface{}, t *testing.T) { |
| n := ValueOf(a).Field(0) |
| if !n.IsNil() { |
| t.Errorf("%v should be nil", a) |
| } |
| } |
| |
| func NotNil(a interface{}, t *testing.T) { |
| n := ValueOf(a).Field(0) |
| if n.IsNil() { |
| t.Errorf("value of type %v should not be nil", ValueOf(a).Type().String()) |
| } |
| } |
| |
| func TestIsNil(t *testing.T) { |
| // These implement IsNil. |
| // Wrap in extra struct to hide interface type. |
| doNil := []interface{}{ |
| struct{ x *int }{}, |
| struct{ x interface{} }{}, |
| struct{ x map[string]int }{}, |
| struct{ x func() bool }{}, |
| struct{ x chan int }{}, |
| struct{ x []string }{}, |
| struct{ x unsafe.Pointer }{}, |
| } |
| for _, ts := range doNil { |
| ty := TypeOf(ts).Field(0).Type |
| v := Zero(ty) |
| v.IsNil() // panics if not okay to call |
| } |
| |
| // Check the implementations |
| var pi struct { |
| x *int |
| } |
| Nil(pi, t) |
| pi.x = new(int) |
| NotNil(pi, t) |
| |
| var si struct { |
| x []int |
| } |
| Nil(si, t) |
| si.x = make([]int, 10) |
| NotNil(si, t) |
| |
| var ci struct { |
| x chan int |
| } |
| Nil(ci, t) |
| ci.x = make(chan int) |
| NotNil(ci, t) |
| |
| var mi struct { |
| x map[int]int |
| } |
| Nil(mi, t) |
| mi.x = make(map[int]int) |
| NotNil(mi, t) |
| |
| var ii struct { |
| x interface{} |
| } |
| Nil(ii, t) |
| ii.x = 2 |
| NotNil(ii, t) |
| |
| var fi struct { |
| x func(t *testing.T) |
| } |
| Nil(fi, t) |
| fi.x = TestIsNil |
| NotNil(fi, t) |
| } |
| |
| func TestIsZero(t *testing.T) { |
| for i, tt := range []struct { |
| x interface{} |
| want bool |
| }{ |
| // Booleans |
| {true, false}, |
| {false, true}, |
| // Numeric types |
| {int(0), true}, |
| {int(1), false}, |
| {int8(0), true}, |
| {int8(1), false}, |
| {int16(0), true}, |
| {int16(1), false}, |
| {int32(0), true}, |
| {int32(1), false}, |
| {int64(0), true}, |
| {int64(1), false}, |
| {uint(0), true}, |
| {uint(1), false}, |
| {uint8(0), true}, |
| {uint8(1), false}, |
| {uint16(0), true}, |
| {uint16(1), false}, |
| {uint32(0), true}, |
| {uint32(1), false}, |
| {uint64(0), true}, |
| {uint64(1), false}, |
| {float32(0), true}, |
| {float32(1.2), false}, |
| {float64(0), true}, |
| {float64(1.2), false}, |
| {math.Copysign(0, -1), false}, |
| {complex64(0), true}, |
| {complex64(1.2), false}, |
| {complex128(0), true}, |
| {complex128(1.2), false}, |
| {complex(math.Copysign(0, -1), 0), false}, |
| {complex(0, math.Copysign(0, -1)), false}, |
| {complex(math.Copysign(0, -1), math.Copysign(0, -1)), false}, |
| {uintptr(0), true}, |
| {uintptr(128), false}, |
| // Array |
| {Zero(TypeOf([5]string{})).Interface(), true}, |
| {[5]string{"", "", "", "", ""}, true}, |
| {[5]string{}, true}, |
| {[5]string{"", "", "", "a", ""}, false}, |
| // Chan |
| {(chan string)(nil), true}, |
| {make(chan string), false}, |
| {time.After(1), false}, |
| // Func |
| {(func())(nil), true}, |
| {New, false}, |
| // Interface |
| {New(TypeOf(new(error)).Elem()).Elem(), true}, |
| {(io.Reader)(strings.NewReader("")), false}, |
| // Map |
| {(map[string]string)(nil), true}, |
| {map[string]string{}, false}, |
| {make(map[string]string), false}, |
| // Ptr |
| {(*func())(nil), true}, |
| {(*int)(nil), true}, |
| {new(int), false}, |
| // Slice |
| {[]string{}, false}, |
| {([]string)(nil), true}, |
| {make([]string, 0), false}, |
| // Strings |
| {"", true}, |
| {"not-zero", false}, |
| // Structs |
| {T{}, true}, |
| {T{123, 456.75, "hello", &_i}, false}, |
| // UnsafePointer |
| {(unsafe.Pointer)(nil), true}, |
| {(unsafe.Pointer)(new(int)), false}, |
| } { |
| var x Value |
| if v, ok := tt.x.(Value); ok { |
| x = v |
| } else { |
| x = ValueOf(tt.x) |
| } |
| |
| b := x.IsZero() |
| if b != tt.want { |
| t.Errorf("%d: IsZero((%s)(%+v)) = %t, want %t", i, x.Kind(), tt.x, b, tt.want) |
| } |
| |
| if !Zero(TypeOf(tt.x)).IsZero() { |
| t.Errorf("%d: IsZero(Zero(TypeOf((%s)(%+v)))) is false", i, x.Kind(), tt.x) |
| } |
| } |
| |
| func() { |
| defer func() { |
| if r := recover(); r == nil { |
| t.Error("should panic for invalid value") |
| } |
| }() |
| (Value{}).IsZero() |
| }() |
| } |
| |
| func TestInterfaceExtraction(t *testing.T) { |
| var s struct { |
| W io.Writer |
| } |
| |
| s.W = os.Stdout |
| v := Indirect(ValueOf(&s)).Field(0).Interface() |
| if v != s.W.(interface{}) { |
| t.Error("Interface() on interface: ", v, s.W) |
| } |
| } |
| |
| func TestNilPtrValueSub(t *testing.T) { |
| var pi *int |
| if pv := ValueOf(pi); pv.Elem().IsValid() { |
| t.Error("ValueOf((*int)(nil)).Elem().IsValid()") |
| } |
| } |
| |
| func TestMap(t *testing.T) { |
| m := map[string]int{"a": 1, "b": 2} |
| mv := ValueOf(m) |
| if n := mv.Len(); n != len(m) { |
| t.Errorf("Len = %d, want %d", n, len(m)) |
| } |
| keys := mv.MapKeys() |
| newmap := MakeMap(mv.Type()) |
| for k, v := range m { |
| // Check that returned Keys match keys in range. |
| // These aren't required to be in the same order. |
| seen := false |
| for _, kv := range keys { |
| if kv.String() == k { |
| seen = true |
| break |
| } |
| } |
| if !seen { |
| t.Errorf("Missing key %q", k) |
| } |
| |
| // Check that value lookup is correct. |
| vv := mv.MapIndex(ValueOf(k)) |
| if vi := vv.Int(); vi != int64(v) { |
| t.Errorf("Key %q: have value %d, want %d", k, vi, v) |
| } |
| |
| // Copy into new map. |
| newmap.SetMapIndex(ValueOf(k), ValueOf(v)) |
| } |
| vv := mv.MapIndex(ValueOf("not-present")) |
| if vv.IsValid() { |
| t.Errorf("Invalid key: got non-nil value %s", valueToString(vv)) |
| } |
| |
| newm := newmap.Interface().(map[string]int) |
| if len(newm) != len(m) { |
| t.Errorf("length after copy: newm=%d, m=%d", len(newm), len(m)) |
| } |
| |
| for k, v := range newm { |
| mv, ok := m[k] |
| if mv != v { |
| t.Errorf("newm[%q] = %d, but m[%q] = %d, %v", k, v, k, mv, ok) |
| } |
| } |
| |
| newmap.SetMapIndex(ValueOf("a"), Value{}) |
| v, ok := newm["a"] |
| if ok { |
| t.Errorf("newm[\"a\"] = %d after delete", v) |
| } |
| |
| mv = ValueOf(&m).Elem() |
| mv.Set(Zero(mv.Type())) |
| if m != nil { |
| t.Errorf("mv.Set(nil) failed") |
| } |
| } |
| |
| func TestNilMap(t *testing.T) { |
| var m map[string]int |
| mv := ValueOf(m) |
| keys := mv.MapKeys() |
| if len(keys) != 0 { |
| t.Errorf(">0 keys for nil map: %v", keys) |
| } |
| |
| // Check that value for missing key is zero. |
| x := mv.MapIndex(ValueOf("hello")) |
| if x.Kind() != Invalid { |
| t.Errorf("m.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x) |
| } |
| |
| // Check big value too. |
| var mbig map[string][10 << 20]byte |
| x = ValueOf(mbig).MapIndex(ValueOf("hello")) |
| if x.Kind() != Invalid { |
| t.Errorf("mbig.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x) |
| } |
| |
| // Test that deletes from a nil map succeed. |
| mv.SetMapIndex(ValueOf("hi"), Value{}) |
| } |
| |
| func TestChan(t *testing.T) { |
| for loop := 0; loop < 2; loop++ { |
| var c chan int |
| var cv Value |
| |
| // check both ways to allocate channels |
| switch loop { |
| case 1: |
| c = make(chan int, 1) |
| cv = ValueOf(c) |
| case 0: |
| cv = MakeChan(TypeOf(c), 1) |
| c = cv.Interface().(chan int) |
| } |
| |
| // Send |
| cv.Send(ValueOf(2)) |
| if i := <-c; i != 2 { |
| t.Errorf("reflect Send 2, native recv %d", i) |
| } |
| |
| // Recv |
| c <- 3 |
| if i, ok := cv.Recv(); i.Int() != 3 || !ok { |
| t.Errorf("native send 3, reflect Recv %d, %t", i.Int(), ok) |
| } |
| |
| // TryRecv fail |
| val, ok := cv.TryRecv() |
| if val.IsValid() || ok { |
| t.Errorf("TryRecv on empty chan: %s, %t", valueToString(val), ok) |
| } |
| |
| // TryRecv success |
| c <- 4 |
| val, ok = cv.TryRecv() |
| if !val.IsValid() { |
| t.Errorf("TryRecv on ready chan got nil") |
| } else if i := val.Int(); i != 4 || !ok { |
| t.Errorf("native send 4, TryRecv %d, %t", i, ok) |
| } |
| |
| // TrySend fail |
| c <- 100 |
| ok = cv.TrySend(ValueOf(5)) |
| i := <-c |
| if ok { |
| t.Errorf("TrySend on full chan succeeded: value %d", i) |
| } |
| |
| // TrySend success |
| ok = cv.TrySend(ValueOf(6)) |
| if !ok { |
| t.Errorf("TrySend on empty chan failed") |
| select { |
| case x := <-c: |
| t.Errorf("TrySend failed but it did send %d", x) |
| default: |
| } |
| } else { |
| if i = <-c; i != 6 { |
| t.Errorf("TrySend 6, recv %d", i) |
| } |
| } |
| |
| // Close |
| c <- 123 |
| cv.Close() |
| if i, ok := cv.Recv(); i.Int() != 123 || !ok { |
| t.Errorf("send 123 then close; Recv %d, %t", i.Int(), ok) |
| } |
| if i, ok := cv.Recv(); i.Int() != 0 || ok { |
| t.Errorf("after close Recv %d, %t", i.Int(), ok) |
| } |
| } |
| |
| // check creation of unbuffered channel |
| var c chan int |
| cv := MakeChan(TypeOf(c), 0) |
| c = cv.Interface().(chan int) |
| if cv.TrySend(ValueOf(7)) { |
| t.Errorf("TrySend on sync chan succeeded") |
| } |
| if v, ok := cv.TryRecv(); v.IsValid() || ok { |
| t.Errorf("TryRecv on sync chan succeeded: isvalid=%v ok=%v", v.IsValid(), ok) |
| } |
| |
| // len/cap |
| cv = MakeChan(TypeOf(c), 10) |
| c = cv.Interface().(chan int) |
| for i := 0; i < 3; i++ { |
| c <- i |
| } |
| if l, m := cv.Len(), cv.Cap(); l != len(c) || m != cap(c) { |
| t.Errorf("Len/Cap = %d/%d want %d/%d", l, m, len(c), cap(c)) |
| } |
| } |
| |
| // caseInfo describes a single case in a select test. |
| type caseInfo struct { |
| desc string |
| canSelect bool |
| recv Value |
| closed bool |
| helper func() |
| panic bool |
| } |
| |
| var allselect = flag.Bool("allselect", false, "exhaustive select test") |
| |
| func TestSelect(t *testing.T) { |
| selectWatch.once.Do(func() { go selectWatcher() }) |
| |
| var x exhaustive |
| nch := 0 |
| newop := func(n int, cap int) (ch, val Value) { |
| nch++ |
| if nch%101%2 == 1 { |
| c := make(chan int, cap) |
| ch = ValueOf(c) |
| val = ValueOf(n) |
| } else { |
| c := make(chan string, cap) |
| ch = ValueOf(c) |
| val = ValueOf(fmt.Sprint(n)) |
| } |
| return |
| } |
| |
| for n := 0; x.Next(); n++ { |
| if testing.Short() && n >= 1000 { |
| break |
| } |
| if n >= 100000 && !*allselect { |
| break |
| } |
| if n%100000 == 0 && testing.Verbose() { |
| println("TestSelect", n) |
| } |
| var cases []SelectCase |
| var info []caseInfo |
| |
| // Ready send. |
| if x.Maybe() { |
| ch, val := newop(len(cases), 1) |
| cases = append(cases, SelectCase{ |
| Dir: SelectSend, |
| Chan: ch, |
| Send: val, |
| }) |
| info = append(info, caseInfo{desc: "ready send", canSelect: true}) |
| } |
| |
| // Ready recv. |
| if x.Maybe() { |
| ch, val := newop(len(cases), 1) |
| ch.Send(val) |
| cases = append(cases, SelectCase{ |
| Dir: SelectRecv, |
| Chan: ch, |
| }) |
| info = append(info, caseInfo{desc: "ready recv", canSelect: true, recv: val}) |
| } |
| |
| // Blocking send. |
| if x.Maybe() { |
| ch, val := newop(len(cases), 0) |
| cases = append(cases, SelectCase{ |
| Dir: SelectSend, |
| Chan: ch, |
| Send: val, |
| }) |
| // Let it execute? |
| if x.Maybe() { |
| f := func() { ch.Recv() } |
| info = append(info, caseInfo{desc: "blocking send", helper: f}) |
| } else { |
| info = append(info, caseInfo{desc: "blocking send"}) |
| } |
| } |
| |
| // Blocking recv. |
| if x.Maybe() { |
| ch, val := newop(len(cases), 0) |
| cases = append(cases, SelectCase{ |
| Dir: SelectRecv, |
| Chan: ch, |
| }) |
| // Let it execute? |
| if x.Maybe() { |
| f := func() { ch.Send(val) } |
| info = append(info, caseInfo{desc: "blocking recv", recv: val, helper: f}) |
| } else { |
| info = append(info, caseInfo{desc: "blocking recv"}) |
| } |
| } |
| |
| // Zero Chan send. |
| if x.Maybe() { |
| // Maybe include value to send. |
| var val Value |
| if x.Maybe() { |
| val = ValueOf(100) |
| } |
| cases = append(cases, SelectCase{ |
| Dir: SelectSend, |
| Send: val, |
| }) |
| info = append(info, caseInfo{desc: "zero Chan send"}) |
| } |
| |
| // Zero Chan receive. |
| if x.Maybe() { |
| cases = append(cases, SelectCase{ |
| Dir: SelectRecv, |
| }) |
| info = append(info, caseInfo{desc: "zero Chan recv"}) |
| } |
| |
| // nil Chan send. |
| if x.Maybe() { |
| cases = append(cases, SelectCase{ |
| Dir: SelectSend, |
| Chan: ValueOf((chan int)(nil)), |
| Send: ValueOf(101), |
| }) |
| info = append(info, caseInfo{desc: "nil Chan send"}) |
| } |
| |
| // nil Chan recv. |
| if x.Maybe() { |
| cases = append(cases, SelectCase{ |
| Dir: SelectRecv, |
| Chan: ValueOf((chan int)(nil)), |
| }) |
| info = append(info, caseInfo{desc: "nil Chan recv"}) |
| } |
| |
| // closed Chan send. |
| if x.Maybe() { |
| ch := make(chan int) |
| close(ch) |
| cases = append(cases, SelectCase{ |
| Dir: SelectSend, |
| Chan: ValueOf(ch), |
| Send: ValueOf(101), |
| }) |
| info = append(info, caseInfo{desc: "closed Chan send", canSelect: true, panic: true}) |
| } |
| |
| // closed Chan recv. |
| if x.Maybe() { |
| ch, val := newop(len(cases), 0) |
| ch.Close() |
| val = Zero(val.Type()) |
| cases = append(cases, SelectCase{ |
| Dir: SelectRecv, |
| Chan: ch, |
| }) |
| info = append(info, caseInfo{desc: "closed Chan recv", canSelect: true, closed: true, recv: val}) |
| } |
| |
| var helper func() // goroutine to help the select complete |
| |
| // Add default? Must be last case here, but will permute. |
| // Add the default if the select would otherwise |
| // block forever, and maybe add it anyway. |
| numCanSelect := 0 |
| canProceed := false |
| canBlock := true |
| canPanic := false |
| helpers := []int{} |
| for i, c := range info { |
| if c.canSelect { |
| canProceed = true |
| canBlock = false |
| numCanSelect++ |
| if c.panic { |
| canPanic = true |
| } |
| } else if c.helper != nil { |
| canProceed = true |
| helpers = append(helpers, i) |
| } |
| } |
| if !canProceed || x.Maybe() { |
| cases = append(cases, SelectCase{ |
| Dir: SelectDefault, |
| }) |
| info = append(info, caseInfo{desc: "default", canSelect: canBlock}) |
| numCanSelect++ |
| } else if canBlock { |
| // Select needs to communicate with another goroutine. |
| cas := &info[helpers[x.Choose(len(helpers))]] |
| helper = cas.helper |
| cas.canSelect = true |
| numCanSelect++ |
| } |
| |
| // Permute cases and case info. |
| // Doing too much here makes the exhaustive loop |
| // too exhausting, so just do two swaps. |
| for loop := 0; loop < 2; loop++ { |
| i := x.Choose(len(cases)) |
| j := x.Choose(len(cases)) |
| cases[i], cases[j] = cases[j], cases[i] |
| info[i], info[j] = info[j], info[i] |
| } |
| |
| if helper != nil { |
| // We wait before kicking off a goroutine to satisfy a blocked select. |
| // The pause needs to be big enough to let the select block before |
| // we run the helper, but if we lose that race once in a while it's okay: the |
| // select will just proceed immediately. Not a big deal. |
| // For short tests we can grow [sic] the timeout a bit without fear of taking too long |
| pause := 10 * time.Microsecond |
| if testing.Short() { |
| pause = 100 * time.Microsecond |
| } |
| time.AfterFunc(pause, helper) |
| } |
| |
| // Run select. |
| i, recv, recvOK, panicErr := runSelect(cases, info) |
| if panicErr != nil && !canPanic { |
| t.Fatalf("%s\npanicked unexpectedly: %v", fmtSelect(info), panicErr) |
| } |
| if panicErr == nil && canPanic && numCanSelect == 1 { |
| t.Fatalf("%s\nselected #%d incorrectly (should panic)", fmtSelect(info), i) |
| } |
| if panicErr != nil { |
| continue |
| } |
| |
| cas := info[i] |
| if !cas.canSelect { |
| recvStr := "" |
| if recv.IsValid() { |
| recvStr = fmt.Sprintf(", received %v, %v", recv.Interface(), recvOK) |
| } |
| t.Fatalf("%s\nselected #%d incorrectly%s", fmtSelect(info), i, recvStr) |
| continue |
| } |
| if cas.panic { |
| t.Fatalf("%s\nselected #%d incorrectly (case should panic)", fmtSelect(info), i) |
| continue |
| } |
| |
| if cases[i].Dir == SelectRecv { |
| if !recv.IsValid() { |
| t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, cas.recv.Interface(), !cas.closed) |
| } |
| if !cas.recv.IsValid() { |
| t.Fatalf("%s\nselected #%d but internal error: missing recv value", fmtSelect(info), i) |
| } |
| if recv.Interface() != cas.recv.Interface() || recvOK != !cas.closed { |
| if recv.Interface() == cas.recv.Interface() && recvOK == !cas.closed { |
| t.Fatalf("%s\nselected #%d, got %#v, %v, and DeepEqual is broken on %T", fmtSelect(info), i, recv.Interface(), recvOK, recv.Interface()) |
| } |
| t.Fatalf("%s\nselected #%d but got %#v, %v, want %#v, %v", fmtSelect(info), i, recv.Interface(), recvOK, cas.recv.Interface(), !cas.closed) |
| } |
| } else { |
| if recv.IsValid() || recvOK { |
| t.Fatalf("%s\nselected #%d but got %v, %v, want %v, %v", fmtSelect(info), i, recv, recvOK, Value{}, false) |
| } |
| } |
| } |
| } |
| |
| func TestSelectMaxCases(t *testing.T) { |
| var sCases []SelectCase |
| channel := make(chan int) |
| close(channel) |
| for i := 0; i < 65536; i++ { |
| sCases = append(sCases, SelectCase{ |
| Dir: SelectRecv, |
| Chan: ValueOf(channel), |
| }) |
| } |
| // Should not panic |
| _, _, _ = Select(sCases) |
| sCases = append(sCases, SelectCase{ |
| Dir: SelectRecv, |
| Chan: ValueOf(channel), |
| }) |
| defer func() { |
| if err := recover(); err != nil { |
| if err.(string) != "reflect.Select: too many cases (max 65536)" { |
| t.Fatalf("unexpected error from select call with greater than max supported cases") |
| } |
| } else { |
| t.Fatalf("expected select call to panic with greater than max supported cases") |
| } |
| }() |
| // Should panic |
| _, _, _ = Select(sCases) |
| } |
| |
| func TestSelectNop(t *testing.T) { |
| // "select { default: }" should always return the default case. |
| chosen, _, _ := Select([]SelectCase{{Dir: SelectDefault}}) |
| if chosen != 0 { |
| t.Fatalf("expected Select to return 0, but got %#v", chosen) |
| } |
| } |
| |
| func BenchmarkSelect(b *testing.B) { |
| channel := make(chan int) |
| close(channel) |
| var cases []SelectCase |
| for i := 0; i < 8; i++ { |
| cases = append(cases, SelectCase{ |
| Dir: SelectRecv, |
| Chan: ValueOf(channel), |
| }) |
| } |
| for _, numCases := range []int{1, 4, 8} { |
| b.Run(strconv.Itoa(numCases), func(b *testing.B) { |
| b.ReportAllocs() |
| for i := 0; i < b.N; i++ { |
| _, _, _ = Select(cases[:numCases]) |
| } |
| }) |
| } |
| } |
| |
| // selectWatch and the selectWatcher are a watchdog mechanism for running Select. |
| // If the selectWatcher notices that the select has been blocked for >1 second, it prints |
| // an error describing the select and panics the entire test binary. |
| var selectWatch struct { |
| sync.Mutex |
| once sync.Once |
| now time.Time |
| info []caseInfo |
| } |
| |
| func selectWatcher() { |
| for { |
| time.Sleep(1 * time.Second) |
| selectWatch.Lock() |
| if selectWatch.info != nil && time.Since(selectWatch.now) > 10*time.Second { |
| fmt.Fprintf(os.Stderr, "TestSelect:\n%s blocked indefinitely\n", fmtSelect(selectWatch.info)) |
| panic("select stuck") |
| } |
| selectWatch.Unlock() |
| } |
| } |
| |
| // runSelect runs a single select test. |
| // It returns the values returned by Select but also returns |
| // a panic value if the Select panics. |
| func runSelect(cases []SelectCase, info []caseInfo) (chosen int, recv Value, recvOK bool, panicErr interface{}) { |
| defer func() { |
| panicErr = recover() |
| |
| selectWatch.Lock() |
| selectWatch.info = nil |
| selectWatch.Unlock() |
| }() |
| |
| selectWatch.Lock() |
| selectWatch.now = time.Now() |
| selectWatch.info = info |
| selectWatch.Unlock() |
| |
| chosen, recv, recvOK = Select(cases) |
| return |
| } |
| |
| // fmtSelect formats the information about a single select test. |
| func fmtSelect(info []caseInfo) string { |
| var buf bytes.Buffer |
| fmt.Fprintf(&buf, "\nselect {\n") |
| for i, cas := range info { |
| fmt.Fprintf(&buf, "%d: %s", i, cas.desc) |
| if cas.recv.IsValid() { |
| fmt.Fprintf(&buf, " val=%#v", cas.recv.Interface()) |
| } |
| if cas.canSelect { |
| fmt.Fprintf(&buf, " canselect") |
| } |
| if cas.panic { |
| fmt.Fprintf(&buf, " panic") |
| } |
| fmt.Fprintf(&buf, "\n") |
| } |
| fmt.Fprintf(&buf, "}") |
| return buf.String() |
| } |
| |
| type two [2]uintptr |
| |
| // Difficult test for function call because of |
| // implicit padding between arguments. |
| 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) { |
| return b, c, d, e, f, g, h |
| } |
| |
| func TestFunc(t *testing.T) { |
| ret := ValueOf(dummy).Call([]Value{ |
| ValueOf(byte(10)), |
| ValueOf(20), |
| ValueOf(byte(30)), |
| ValueOf(two{40, 50}), |
| ValueOf(byte(60)), |
| ValueOf(float32(70)), |
| ValueOf(byte(80)), |
| }) |
| if len(ret) != 7 { |
| t.Fatalf("Call returned %d values, want 7", len(ret)) |
| } |
| |
| i := byte(ret[0].Uint()) |
| j := int(ret[1].Int()) |
| k := byte(ret[2].Uint()) |
| l := ret[3].Interface().(two) |
| m := byte(ret[4].Uint()) |
| n := float32(ret[5].Float()) |
| o := byte(ret[6].Uint()) |
| |
| if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 { |
| 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) |
| } |
| |
| for i, v := range ret { |
| if v.CanAddr() { |
| t.Errorf("result %d is addressable", i) |
| } |
| } |
| } |
| |
| func TestCallConvert(t *testing.T) { |
| v := ValueOf(new(io.ReadWriter)).Elem() |
| f := ValueOf(func(r io.Reader) io.Reader { return r }) |
| out := f.Call([]Value{v}) |
| if len(out) != 1 || out[0].Type() != TypeOf(new(io.Reader)).Elem() || !out[0].IsNil() { |
| t.Errorf("expected [nil], got %v", out) |
| } |
| } |
| |
| type emptyStruct struct{} |
| |
| type nonEmptyStruct struct { |
| member int |
| } |
| |
| func returnEmpty() emptyStruct { |
| return emptyStruct{} |
| } |
| |
| func takesEmpty(e emptyStruct) { |
| } |
| |
| func returnNonEmpty(i int) nonEmptyStruct { |
| return nonEmptyStruct{member: i} |
| } |
| |
| func takesNonEmpty(n nonEmptyStruct) int { |
| return n.member |
| } |
| |
| func TestCallWithStruct(t *testing.T) { |
| r := ValueOf(returnEmpty).Call(nil) |
| if len(r) != 1 || r[0].Type() != TypeOf(emptyStruct{}) { |
| t.Errorf("returning empty struct returned %#v instead", r) |
| } |
| r = ValueOf(takesEmpty).Call([]Value{ValueOf(emptyStruct{})}) |
| if len(r) != 0 { |
| t.Errorf("takesEmpty returned values: %#v", r) |
| } |
| r = ValueOf(returnNonEmpty).Call([]Value{ValueOf(42)}) |
| if len(r) != 1 || r[0].Type() != TypeOf(nonEmptyStruct{}) || r[0].Field(0).Int() != 42 { |
| t.Errorf("returnNonEmpty returned %#v", r) |
| } |
| r = ValueOf(takesNonEmpty).Call([]Value{ValueOf(nonEmptyStruct{member: 42})}) |
| if len(r) != 1 || r[0].Type() != TypeOf(1) || r[0].Int() != 42 { |
| t.Errorf("takesNonEmpty returned %#v", r) |
| } |
| } |
| |
| func TestCallReturnsEmpty(t *testing.T) { |
| // Issue 21717: past-the-end pointer write in Call with |
| // nonzero-sized frame and zero-sized return value. |
| runtime.GC() |
| var finalized uint32 |
| f := func() (emptyStruct, *[2]int64) { |
| i := new([2]int64) // big enough to not be tinyalloc'd, so finalizer always runs when i dies |
| runtime.SetFinalizer(i, func(*[2]int64) { atomic.StoreUint32(&finalized, 1) }) |
| return emptyStruct{}, i |
| } |
| v := ValueOf(f).Call(nil)[0] // out[0] should not alias out[1]'s memory, so the finalizer should run. |
| timeout := time.After(5 * time.Second) |
| for atomic.LoadUint32(&finalized) == 0 { |
| select { |
| case <-timeout: |
| t.Fatal("finalizer did not run") |
| default: |
| } |
| runtime.Gosched() |
| runtime.GC() |
| } |
| runtime.KeepAlive(v) |
| } |
| |
| func BenchmarkCall(b *testing.B) { |
| fv := ValueOf(func(a, b string) {}) |
| b.ReportAllocs() |
| b.RunParallel(func(pb *testing.PB) { |
| args := []Value{ValueOf("a"), ValueOf("b")} |
| for pb.Next() { |
| fv.Call(args) |
| } |
| }) |
| } |
| |
| func BenchmarkCallArgCopy(b *testing.B) { |
| byteArray := func(n int) Value { |
| return Zero(ArrayOf(n, TypeOf(byte(0)))) |
| } |
| sizes := [...]struct { |
| fv Value |
| arg Value |
| }{ |
| {ValueOf(func(a [128]byte) {}), byteArray(128)}, |
| {ValueOf(func(a [256]byte) {}), byteArray(256)}, |
| {ValueOf(func(a [1024]byte) {}), byteArray(1024)}, |
| {ValueOf(func(a [4096]byte) {}), byteArray(4096)}, |
| {ValueOf(func(a [65536]byte) {}), byteArray(65536)}, |
| } |
| for _, size := range sizes { |
| bench := func(b *testing.B) { |
| args := []Value{size.arg} |
| b.SetBytes(int64(size.arg.Len())) |
| b.ResetTimer() |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| size.fv.Call(args) |
| } |
| }) |
| } |
| name := fmt.Sprintf("size=%v", size.arg.Len()) |
| b.Run(name, bench) |
| } |
| } |
| |
| func TestMakeFunc(t *testing.T) { |
| f := dummy |
| fv := MakeFunc(TypeOf(f), func(in []Value) []Value { return in }) |
| ValueOf(&f).Elem().Set(fv) |
| |
| // Call g with small arguments so that there is |
| // something predictable (and different from the |
| // correct results) in those positions on the stack. |
| g := dummy |
| g(1, 2, 3, two{4, 5}, 6, 7, 8) |
| |
| // Call constructed function f. |
| i, j, k, l, m, n, o := f(10, 20, 30, two{40, 50}, 60, 70, 80) |
| if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 { |
| 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) |
| } |
| } |
| |
| func TestMakeFuncInterface(t *testing.T) { |
| fn := func(i int) int { return i } |
| incr := func(in []Value) []Value { |
| return []Value{ValueOf(int(in[0].Int() + 1))} |
| } |
| fv := MakeFunc(TypeOf(fn), incr) |
| ValueOf(&fn).Elem().Set(fv) |
| if r := fn(2); r != 3 { |
| t.Errorf("Call returned %d, want 3", r) |
| } |
| if r := fv.Call([]Value{ValueOf(14)})[0].Int(); r != 15 { |
| t.Errorf("Call returned %d, want 15", r) |
| } |
| if r := fv.Interface().(func(int) int)(26); r != 27 { |
| t.Errorf("Call returned %d, want 27", r) |
| } |
| } |
| |
| func TestMakeFuncVariadic(t *testing.T) { |
| // Test that variadic arguments are packed into a slice and passed as last arg |
| fn := func(_ int, is ...int) []int { return nil } |
| fv := MakeFunc(TypeOf(fn), func(in []Value) []Value { return in[1:2] }) |
| ValueOf(&fn).Elem().Set(fv) |
| |
| r := fn(1, 2, 3) |
| if r[0] != 2 || r[1] != 3 { |
| t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) |
| } |
| |
| r = fn(1, []int{2, 3}...) |
| if r[0] != 2 || r[1] != 3 { |
| t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) |
| } |
| |
| r = fv.Call([]Value{ValueOf(1), ValueOf(2), ValueOf(3)})[0].Interface().([]int) |
| if r[0] != 2 || r[1] != 3 { |
| t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) |
| } |
| |
| r = fv.CallSlice([]Value{ValueOf(1), ValueOf([]int{2, 3})})[0].Interface().([]int) |
| if r[0] != 2 || r[1] != 3 { |
| t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) |
| } |
| |
| f := fv.Interface().(func(int, ...int) []int) |
| |
| r = f(1, 2, 3) |
| if r[0] != 2 || r[1] != 3 { |
| t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) |
| } |
| r = f(1, []int{2, 3}...) |
| if r[0] != 2 || r[1] != 3 { |
| t.Errorf("Call returned [%v, %v]; want 2, 3", r[0], r[1]) |
| } |
| } |
| |
| // Dummy type that implements io.WriteCloser |
| type WC struct { |
| } |
| |
| func (w *WC) Write(p []byte) (n int, err error) { |
| return 0, nil |
| } |
| func (w *WC) Close() error { |
| return nil |
| } |
| |
| func TestMakeFuncValidReturnAssignments(t *testing.T) { |
| // reflect.Values returned from the wrapped function should be assignment-converted |
| // to the types returned by the result of MakeFunc. |
| |
| // Concrete types should be promotable to interfaces they implement. |
| var f func() error |
| f = MakeFunc(TypeOf(f), func([]Value) []Value { |
| return []Value{ValueOf(io.EOF)} |
| }).Interface().(func() error) |
| f() |
| |
| // Super-interfaces should be promotable to simpler interfaces. |
| var g func() io.Writer |
| g = MakeFunc(TypeOf(g), func([]Value) []Value { |
| var w io.WriteCloser = &WC{} |
| return []Value{ValueOf(&w).Elem()} |
| }).Interface().(func() io.Writer) |
| g() |
| |
| // Channels should be promotable to directional channels. |
| var h func() <-chan int |
| h = MakeFunc(TypeOf(h), func([]Value) []Value { |
| return []Value{ValueOf(make(chan int))} |
| }).Interface().(func() <-chan int) |
| h() |
| |
| // Unnamed types should be promotable to named types. |
| type T struct{ a, b, c int } |
| var i func() T |
| i = MakeFunc(TypeOf(i), func([]Value) []Value { |
| return []Value{ValueOf(struct{ a, b, c int }{a: 1, b: 2, c: 3})} |
| }).Interface().(func() T) |
| i() |
| } |
| |
| func TestMakeFuncInvalidReturnAssignments(t *testing.T) { |
| // Type doesn't implement the required interface. |
| shouldPanic("", func() { |
| var f func() error |
| f = MakeFunc(TypeOf(f), func([]Value) []Value { |
| return []Value{ValueOf(int(7))} |
| }).Interface().(func() error) |
| f() |
| }) |
| // Assigning to an interface with additional methods. |
| shouldPanic("", func() { |
| var f func() io.ReadWriteCloser |
| f = MakeFunc(TypeOf(f), func([]Value) []Value { |
| var w io.WriteCloser = &WC{} |
| return []Value{ValueOf(&w).Elem()} |
| }).Interface().(func() io.ReadWriteCloser) |
| f() |
| }) |
| // Directional channels can't be assigned to bidirectional ones. |
| shouldPanic("", func() { |
| var f func() chan int |
| f = MakeFunc(TypeOf(f), func([]Value) []Value { |
| var c <-chan int = make(chan int) |
| return []Value{ValueOf(c)} |
| }).Interface().(func() chan int) |
| f() |
| }) |
| // Two named types which are otherwise identical. |
| shouldPanic("", func() { |
| type T struct{ a, b, c int } |
| type U struct{ a, b, c int } |
| var f func() T |
| f = MakeFunc(TypeOf(f), func([]Value) []Value { |
| return []Value{ValueOf(U{a: 1, b: 2, c: 3})} |
| }).Interface().(func() T) |
| f() |
| }) |
| } |
| |
| type Point struct { |
| x, y int |
| } |
| |
| // This will be index 0. |
| func (p Point) AnotherMethod(scale int) int { |
| return -1 |
| } |
| |
| // This will be index 1. |
| func (p Point) Dist(scale int) int { |
| //println("Point.Dist", p.x, p.y, scale) |
| return p.x*p.x*scale + p.y*p.y*scale |
| } |
| |
| // This will be index 2. |
| func (p Point) GCMethod(k int) int { |
| runtime.GC() |
| return k + p.x |
| } |
| |
| // This will be index 3. |
| func (p Point) NoArgs() { |
| // Exercise no-argument/no-result paths. |
| } |
| |
| // This will be index 4. |
| func (p Point) TotalDist(points ...Point) int { |
| tot := 0 |
| for _, q := range points { |
| dx := q.x - p.x |
| dy := q.y - p.y |
| tot += dx*dx + dy*dy // Should call Sqrt, but it's just a test. |
| |
| } |
| return tot |
| } |
| |
| // This will be index 5. |
| func (p *Point) Int64Method(x int64) int64 { |
| return x |
| } |
| |
| // This will be index 6. |
| func (p *Point) Int32Method(x int32) int32 { |
| return x |
| } |
| |
| func TestMethod(t *testing.T) { |
| // Non-curried method of type. |
| p := Point{3, 4} |
| i := TypeOf(p).Method(1).Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int() |
| if i != 250 { |
| t.Errorf("Type Method returned %d; want 250", i) |
| } |
| |
| m, ok := TypeOf(p).MethodByName("Dist") |
| if !ok { |
| t.Fatalf("method by name failed") |
| } |
| i = m.Func.Call([]Value{ValueOf(p), ValueOf(11)})[0].Int() |
| if i != 275 { |
| t.Errorf("Type MethodByName returned %d; want 275", i) |
| } |
| |
| m, ok = TypeOf(p).MethodByName("NoArgs") |
| if !ok { |
| t.Fatalf("method by name failed") |
| } |
| n := len(m.Func.Call([]Value{ValueOf(p)})) |
| if n != 0 { |
| t.Errorf("NoArgs returned %d values; want 0", n) |
| } |
| |
| i = TypeOf(&p).Method(1).Func.Call([]Value{ValueOf(&p), ValueOf(12)})[0].Int() |
| if i != 300 { |
| t.Errorf("Pointer Type Method returned %d; want 300", i) |
| } |
| |
| m, ok = TypeOf(&p).MethodByName("Dist") |
| if !ok { |
| t.Fatalf("ptr method by name failed") |
| } |
| i = m.Func.Call([]Value{ValueOf(&p), ValueOf(13)})[0].Int() |
| if i != 325 { |
| t.Errorf("Pointer Type MethodByName returned %d; want 325", i) |
| } |
| |
| m, ok = TypeOf(&p).MethodByName("NoArgs") |
| if !ok { |
| t.Fatalf("method by name failed") |
| } |
| n = len(m.Func.Call([]Value{ValueOf(&p)})) |
| if n != 0 { |
| t.Errorf("NoArgs returned %d values; want 0", n) |
| } |
| |
| // Curried method of value. |
| tfunc := TypeOf((func(int) int)(nil)) |
| v := ValueOf(p).Method(1) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Value Method Type is %s; want %s", tt, tfunc) |
| } |
| i = v.Call([]Value{ValueOf(14)})[0].Int() |
| if i != 350 { |
| t.Errorf("Value Method returned %d; want 350", i) |
| } |
| v = ValueOf(p).MethodByName("Dist") |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc) |
| } |
| i = v.Call([]Value{ValueOf(15)})[0].Int() |
| if i != 375 { |
| t.Errorf("Value MethodByName returned %d; want 375", i) |
| } |
| v = ValueOf(p).MethodByName("NoArgs") |
| v.Call(nil) |
| |
| // Curried method of pointer. |
| v = ValueOf(&p).Method(1) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc) |
| } |
| i = v.Call([]Value{ValueOf(16)})[0].Int() |
| if i != 400 { |
| t.Errorf("Pointer Value Method returned %d; want 400", i) |
| } |
| v = ValueOf(&p).MethodByName("Dist") |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc) |
| } |
| i = v.Call([]Value{ValueOf(17)})[0].Int() |
| if i != 425 { |
| t.Errorf("Pointer Value MethodByName returned %d; want 425", i) |
| } |
| v = ValueOf(&p).MethodByName("NoArgs") |
| v.Call(nil) |
| |
| // Curried method of interface value. |
| // Have to wrap interface value in a struct to get at it. |
| // Passing it to ValueOf directly would |
| // access the underlying Point, not the interface. |
| var x interface { |
| Dist(int) int |
| } = p |
| pv := ValueOf(&x).Elem() |
| v = pv.Method(0) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Interface Method Type is %s; want %s", tt, tfunc) |
| } |
| i = v.Call([]Value{ValueOf(18)})[0].Int() |
| if i != 450 { |
| t.Errorf("Interface Method returned %d; want 450", i) |
| } |
| v = pv.MethodByName("Dist") |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc) |
| } |
| i = v.Call([]Value{ValueOf(19)})[0].Int() |
| if i != 475 { |
| t.Errorf("Interface MethodByName returned %d; want 475", i) |
| } |
| } |
| |
| func TestMethodValue(t *testing.T) { |
| p := Point{3, 4} |
| var i int64 |
| |
| // Curried method of value. |
| tfunc := TypeOf((func(int) int)(nil)) |
| v := ValueOf(p).Method(1) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Value Method Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(10)})[0].Int() |
| if i != 250 { |
| t.Errorf("Value Method returned %d; want 250", i) |
| } |
| v = ValueOf(p).MethodByName("Dist") |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Value MethodByName Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(11)})[0].Int() |
| if i != 275 { |
| t.Errorf("Value MethodByName returned %d; want 275", i) |
| } |
| v = ValueOf(p).MethodByName("NoArgs") |
| ValueOf(v.Interface()).Call(nil) |
| v.Interface().(func())() |
| |
| // Curried method of pointer. |
| v = ValueOf(&p).Method(1) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Pointer Value Method Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(12)})[0].Int() |
| if i != 300 { |
| t.Errorf("Pointer Value Method returned %d; want 300", i) |
| } |
| v = ValueOf(&p).MethodByName("Dist") |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Pointer Value MethodByName Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(13)})[0].Int() |
| if i != 325 { |
| t.Errorf("Pointer Value MethodByName returned %d; want 325", i) |
| } |
| v = ValueOf(&p).MethodByName("NoArgs") |
| ValueOf(v.Interface()).Call(nil) |
| v.Interface().(func())() |
| |
| // Curried method of pointer to pointer. |
| pp := &p |
| v = ValueOf(&pp).Elem().Method(1) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Pointer Pointer Value Method Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(14)})[0].Int() |
| if i != 350 { |
| t.Errorf("Pointer Pointer Value Method returned %d; want 350", i) |
| } |
| v = ValueOf(&pp).Elem().MethodByName("Dist") |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Pointer Pointer Value MethodByName Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(15)})[0].Int() |
| if i != 375 { |
| t.Errorf("Pointer Pointer Value MethodByName returned %d; want 375", i) |
| } |
| |
| // Curried method of interface value. |
| // Have to wrap interface value in a struct to get at it. |
| // Passing it to ValueOf directly would |
| // access the underlying Point, not the interface. |
| var s = struct { |
| X interface { |
| Dist(int) int |
| } |
| }{p} |
| pv := ValueOf(s).Field(0) |
| v = pv.Method(0) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Interface Method Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(16)})[0].Int() |
| if i != 400 { |
| t.Errorf("Interface Method returned %d; want 400", i) |
| } |
| v = pv.MethodByName("Dist") |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Interface MethodByName Type is %s; want %s", tt, tfunc) |
| } |
| i = ValueOf(v.Interface()).Call([]Value{ValueOf(17)})[0].Int() |
| if i != 425 { |
| t.Errorf("Interface MethodByName returned %d; want 425", i) |
| } |
| |
| // For issue #33628: method args are not stored at the right offset |
| // on amd64p32. |
| m64 := ValueOf(&p).MethodByName("Int64Method").Interface().(func(int64) int64) |
| if x := m64(123); x != 123 { |
| t.Errorf("Int64Method returned %d; want 123", x) |
| } |
| m32 := ValueOf(&p).MethodByName("Int32Method").Interface().(func(int32) int32) |
| if x := m32(456); x != 456 { |
| t.Errorf("Int32Method returned %d; want 456", x) |
| } |
| } |
| |
| func TestVariadicMethodValue(t *testing.T) { |
| p := Point{3, 4} |
| points := []Point{{20, 21}, {22, 23}, {24, 25}} |
| want := int64(p.TotalDist(points[0], points[1], points[2])) |
| |
| // Variadic method of type. |
| tfunc := TypeOf((func(Point, ...Point) int)(nil)) |
| if tt := TypeOf(p).Method(4).Type; tt != tfunc { |
| t.Errorf("Variadic Method Type from TypeOf is %s; want %s", tt, tfunc) |
| } |
| |
| // Curried method of value. |
| tfunc = TypeOf((func(...Point) int)(nil)) |
| v := ValueOf(p).Method(4) |
| if tt := v.Type(); tt != tfunc { |
| t.Errorf("Variadic Method Type is %s; want %s", tt, tfunc) |
| } |
| i := ValueOf(v.Interface()).Call([]Value{ValueOf(points[0]), ValueOf(points[1]), ValueOf(points[2])})[0].Int() |
| if i != want { |
| t.Errorf("Variadic Method returned %d; want %d", i, want) |
| } |
| i = ValueOf(v.Interface()).CallSlice([]Value{ValueOf(points)})[0].Int() |
| if i != want { |
| t.Errorf("Variadic Method CallSlice returned %d; want %d", i, want) |
| } |
| |
| f := v.Interface().(func(...Point) int) |
| i = int64(f(points[0], points[1], points[2])) |
| if i != want { |
| t.Errorf("Variadic Method Interface returned %d; want %d", i, want) |
| } |
| i = int64(f(points...)) |
| if i != want { |
| t.Errorf("Variadic Method Interface Slice returned %d; want %d", i, want) |
| } |
| } |
| |
| type DirectIfaceT struct { |
| p *int |
| } |
| |
| func (d DirectIfaceT) M() int { return *d.p } |
| |
| func TestDirectIfaceMethod(t *testing.T) { |
| x := 42 |
| v := DirectIfaceT{&x} |
| typ := TypeOf(v) |
| m, ok := typ.MethodByName("M") |
| if !ok { |
| t.Fatalf("cannot find method M") |
| } |
| in := []Value{ValueOf(v)} |
| out := m.Func.Call(in) |
| if got := out[0].Int(); got != 42 { |
| t.Errorf("Call with value receiver got %d, want 42", got) |
| } |
| |
| pv := &v |
| typ = TypeOf(pv) |
| m, ok = typ.MethodByName("M") |
| if !ok { |
| t.Fatalf("cannot find method M") |
| } |
| in = []Value{ValueOf(pv)} |
| out = m.Func.Call(in) |
| if got := out[0].Int(); got != 42 { |
| t.Errorf("Call with pointer receiver got %d, want 42", got) |
| } |
| } |
| |
| // Reflect version of $GOROOT/test/method5.go |
| |
| // Concrete types implementing M method. |
| // Smaller than a word, word-sized, larger than a word. |
| // Value and pointer receivers. |
| |
| type Tinter interface { |
| M(int, byte) (byte, int) |
| } |
| |
| type Tsmallv byte |
| |
| func (v Tsmallv) M(x int, b byte) (byte, int) { return b, x + int(v) } |
| |
| type Tsmallp byte |
| |
| func (p *Tsmallp) M(x int, b byte) (byte, int) { return b, x + int(*p) } |
| |
| type Twordv uintptr |
| |
| func (v Twordv) M(x int, b byte) (byte, int) { return b, x + int(v) } |
| |
| type Twordp uintptr |
| |
| func (p *Twordp) M(x int, b byte) (byte, int) { return b, x + int(*p) } |
| |
| type Tbigv [2]uintptr |
| |
| func (v Tbigv) M(x int, b byte) (byte, int) { return b, x + int(v[0]) + int(v[1]) } |
| |
| type Tbigp [2]uintptr |
| |
| func (p *Tbigp) M(x int, b byte) (byte, int) { return b, x + int(p[0]) + int(p[1]) } |
| |
| type tinter interface { |
| m(int, byte) (byte, int) |
| } |
| |
| // Embedding via pointer. |
| |
| type Tm1 struct { |
| Tm2 |
| } |
| |
| type Tm2 struct { |
| *Tm3 |
| } |
| |
| type Tm3 struct { |
| *Tm4 |
| } |
| |
| type Tm4 struct { |
| } |
| |
| func (t4 Tm4) M(x int, b byte) (byte, int) { return b, x + 40 } |
| |
| func TestMethod5(t *testing.T) { |
| CheckF := func(name string, f func(int, byte) (byte, int), inc int) { |
| b, x := f(1000, 99) |
| if b != 99 || x != 1000+inc { |
| t.Errorf("%s(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc) |
| } |
| } |
| |
| CheckV := func(name string, i Value, inc int) { |
| bx := i.Method(0).Call([]Value{ValueOf(1000), ValueOf(byte(99))}) |
| b := bx[0].Interface() |
| x := bx[1].Interface() |
| if b != byte(99) || x != 1000+inc { |
| t.Errorf("direct %s.M(1000, 99) = %v, %v, want 99, %v", name, b, x, 1000+inc) |
| } |
| |
| CheckF(name+".M", i.Method(0).Interface().(func(int, byte) (byte, int)), inc) |
| } |
| |
| var TinterType = TypeOf(new(Tinter)).Elem() |
| |
| CheckI := func(name string, i interface{}, inc int) { |
| v := ValueOf(i) |
| CheckV(name, v, inc) |
| CheckV("(i="+name+")", v.Convert(TinterType), inc) |
| } |
| |
| sv := Tsmallv(1) |
| CheckI("sv", sv, 1) |
| CheckI("&sv", &sv, 1) |
| |
| sp := Tsmallp(2) |
| CheckI("&sp", &sp, 2) |
| |
| wv := Twordv(3) |
| CheckI("wv", wv, 3) |
| CheckI("&wv", &wv, 3) |
| |
| wp := Twordp(4) |
| CheckI("&wp", &wp, 4) |
| |
| bv := Tbigv([2]uintptr{5, 6}) |
| CheckI("bv", bv, 11) |
| CheckI("&bv", &bv, 11) |
| |
| bp := Tbigp([2]uintptr{7, 8}) |
| CheckI("&bp", &bp, 15) |
| |
| t4 := Tm4{} |
| t3 := Tm3{&t4} |
| t2 := Tm2{&t3} |
| t1 := Tm1{t2} |
| CheckI("t4", t4, 40) |
| CheckI("&t4", &t4, 40) |
| CheckI("t3", t3, 40) |
| CheckI("&t3", &t3, 40) |
| CheckI("t2", t2, 40) |
| CheckI("&t2", &t2, 40) |
| CheckI("t1", t1, 40) |
| CheckI("&t1", &t1, 40) |
| |
| var tnil Tinter |
| vnil := ValueOf(&tnil).Elem() |
| shouldPanic("Method", func() { vnil.Method(0) }) |
| } |
| |
| func TestInterfaceSet(t *testing.T) { |
| p := &Point{3, 4} |
| |
| var s struct { |
| I interface{} |
| P interface { |
| Dist(int) int |
| } |
| } |
| sv := ValueOf(&s).Elem() |
| sv.Field(0).Set(ValueOf(p)) |
| if q := s.I.(*Point); q != p { |
| t.Errorf("i: have %p want %p", q, p) |
| } |
| |
| pv := sv.Field(1) |
| pv.Set(ValueOf(p)) |
| if q := s.P.(*Point); q != p { |
| t.Errorf("i: have %p want %p", q, p) |
| } |
| |
| i := pv.Method(0).Call([]Value{ValueOf(10)})[0].Int() |
| if i != 250 { |
| t.Errorf("Interface Method returned %d; want 250", i) |
| } |
| } |
| |
| type T1 struct { |
| a string |
| int |
| } |
| |
| func TestAnonymousFields(t *testing.T) { |
| var field StructField |
| var ok bool |
| var t1 T1 |
| type1 := TypeOf(t1) |
| if field, ok = type1.FieldByName("int"); !ok { |
| t.Fatal("no field 'int'") |
| } |
| if field.Index[0] != 1 { |
| t.Error("field index should be 1; is", field.Index) |
| } |
| } |
| |
| type FTest struct { |
| s interface{} |
| name string |
| index []int |
| value int |
| } |
| |
| type D1 struct { |
| d int |
| } |
| type D2 struct { |
| d int |
| } |
| |
| type S0 struct { |
| A, B, C int |
| D1 |
| D2 |
| } |
| |
| type S1 struct { |
| B int |
| S0 |
| } |
| |
| type S2 struct { |
| A int |
| *S1 |
| } |
| |
| type S1x struct { |
| S1 |
| } |
| |
| type S1y struct { |
| S1 |
| } |
| |
| type S3 struct { |
| S1x |
| S2 |
| D, E int |
| *S1y |
| } |
| |
| type S4 struct { |
| *S4 |
| A int |
| } |
| |
| // The X in S6 and S7 annihilate, but they also block the X in S8.S9. |
| type S5 struct { |
| S6 |
| S7 |
| S8 |
| } |
| |
| type S6 struct { |
| X int |
| } |
| |
| type S7 S6 |
| |
| type S8 struct { |
| S9 |
| } |
| |
| type S9 struct { |
| X int |
| Y int |
| } |
| |
| // The X in S11.S6 and S12.S6 annihilate, but they also block the X in S13.S8.S9. |
| type S10 struct { |
| S11 |
| S12 |
| S13 |
| } |
| |
| type S11 struct { |
| S6 |
| } |
| |
| type S12 struct { |
| S6 |
| } |
| |
| type S13 struct { |
| S8 |
| } |
| |
| // The X in S15.S11.S1 and S16.S11.S1 annihilate. |
| type S14 struct { |
| S15 |
| S16 |
| } |
| |
| type S15 struct { |
| S11 |
| } |
| |
| type S16 struct { |
| S11 |
| } |
| |
| var fieldTests = []FTest{ |
| {struct{}{}, "", nil, 0}, |
| {struct{}{}, "Foo", nil, 0}, |
| {S0{A: 'a'}, "A", []int{0}, 'a'}, |
| {S0{}, "D", nil, 0}, |
| {S1{S0: S0{A: 'a'}}, "A", []int{1, 0}, 'a'}, |
| {S1{B: 'b'}, "B", []int{0}, 'b'}, |
| {S1{}, "S0", []int{1}, 0}, |
| {S1{S0: S0{C: 'c'}}, "C", []int{1, 2}, 'c'}, |
| {S2{A: 'a'}, "A", []int{0}, 'a'}, |
| {S2{}, "S1", []int{1}, 0}, |
| {S2{S1: &S1{B: 'b'}}, "B", []int{1, 0}, 'b'}, |
| {S2{S1: &S1{S0: S0{C: 'c'}}}, "C", []int{1, 1, 2}, 'c'}, |
| {S2{}, "D", nil, 0}, |
| {S3{}, "S1", nil, 0}, |
| {S3{S2: S2{A: 'a'}}, "A", []int{1, 0}, 'a'}, |
| {S3{}, "B", nil, 0}, |
| {S3{D: 'd'}, "D", []int{2}, 0}, |
| {S3{E: 'e'}, "E", []int{3}, 'e'}, |
| {S4{A: 'a'}, "A", []int{1}, 'a'}, |
| {S4{}, "B", nil, 0}, |
| {S5{}, "X", nil, 0}, |
| {S5{}, "Y", []int{2, 0, 1}, 0}, |
| {S10{}, "X", nil, 0}, |
| {S10{}, "Y", []int{2, 0, 0, 1}, 0}, |
| {S14{}, "X", nil, 0}, |
| } |
| |
| func TestFieldByIndex(t *testing.T) { |
| for _, test := range fieldTests { |
| s := TypeOf(test.s) |
| f := s.FieldByIndex(test.index) |
| if f.Name != "" { |
| if test.index != nil { |
| if f.Name != test.name { |
| t.Errorf("%s.%s found; want %s", s.Name(), f.Name, test.name) |
| } |
| } else { |
| t.Errorf("%s.%s found", s.Name(), f.Name) |
| } |
| } else if len(test.index) > 0 { |
| t.Errorf("%s.%s not found", s.Name(), test.name) |
| } |
| |
| if test.value != 0 { |
| v := ValueOf(test.s).FieldByIndex(test.index) |
| if v.IsValid() { |
| if x, ok := v.Interface().(int); ok { |
| if x != test.value { |
| t.Errorf("%s%v is %d; want %d", s.Name(), test.index, x, test.value) |
| } |
| } else { |
| t.Errorf("%s%v value not an int", s.Name(), test.index) |
| } |
| } else { |
| t.Errorf("%s%v value not found", s.Name(), test.index) |
| } |
| } |
| } |
| } |
| |
| func TestFieldByName(t *testing.T) { |
| for _, test := range fieldTests { |
| s := TypeOf(test.s) |
| f, found := s.FieldByName(test.name) |
| if found { |
| if test.index != nil { |
| // Verify field depth and index. |
| if len(f.Index) != len(test.index) { |
| 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) |
| } else { |
| for i, x := range f.Index { |
| if x != test.index[i] { |
| t.Errorf("%s.%s.Index[%d] is %d; want %d", s.Name(), test.name, i, x, test.index[i]) |
| } |
| } |
| } |
| } else { |
| t.Errorf("%s.%s found", s.Name(), f.Name) |
| } |
| } else if len(test.index) > 0 { |
| t.Errorf("%s.%s not found", s.Name(), test.name) |
| } |
| |
| if test.value != 0 { |
| v := ValueOf(test.s).FieldByName(test.name) |
| if v.IsValid() { |
| if x, ok := v.Interface().(int); ok { |
| if x != test.value { |
| t.Errorf("%s.%s is %d; want %d", s.Name(), test.name, x, test.value) |
| } |
| } else { |
| t.Errorf("%s.%s value not an int", s.Name(), test.name) |
| } |
| } else { |
| t.Errorf("%s.%s value not found", s.Name(), test.name) |
| } |
| } |
| } |
| } |
| |
| func TestImportPath(t *testing.T) { |
| tests := []struct { |
| t Type |
| path string |
| }{ |
| {TypeOf(&base64.Encoding{}).Elem(), "encoding/base64"}, |
| {TypeOf(int(0)), ""}, |
| {TypeOf(int8(0)), ""}, |
| {TypeOf(int16(0)), ""}, |
| {TypeOf(int32(0)), ""}, |
| {TypeOf(int64(0)), ""}, |
| {TypeOf(uint(0)), ""}, |
| {TypeOf(uint8(0)), ""}, |
| {TypeOf(uint16(0)), ""}, |
| {TypeOf(uint32(0)), ""}, |
| {TypeOf(uint64(0)), ""}, |
| {TypeOf(uintptr(0)), ""}, |
| {TypeOf(float32(0)), ""}, |
| {TypeOf(float64(0)), ""}, |
| {TypeOf(complex64(0)), ""}, |
| {TypeOf(complex128(0)), ""}, |
| {TypeOf(byte(0)), ""}, |
| {TypeOf(rune(0)), ""}, |
| {TypeOf([]byte(nil)), ""}, |
| {TypeOf([]rune(nil)), ""}, |
| {TypeOf(string("")), ""}, |
| {TypeOf((*interface{})(nil)).Elem(), ""}, |
| {TypeOf((*byte)(nil)), ""}, |
| {TypeOf((*rune)(nil)), ""}, |
| {TypeOf((*int64)(nil)), ""}, |
| {TypeOf(map[string]int{}), ""}, |
| {TypeOf((*error)(nil)).Elem(), ""}, |
| {TypeOf((*Point)(nil)), ""}, |
| {TypeOf((*Point)(nil)).Elem(), "reflect_test"}, |
| } |
| for _, test := range tests { |
| if path := test.t.PkgPath(); path != test.path { |
| t.Errorf("%v.PkgPath() = %q, want %q", test.t, path, test.path) |
| } |
| } |
| } |
| |
| func TestFieldPkgPath(t *testing.T) { |
| type x int |
| typ := TypeOf(struct { |
| Exported string |
| unexported string |
| OtherPkgFields |
| int // issue 21702 |
| *x // issue 21122 |
| }{}) |
| |
| type pkgpathTest struct { |
| index []int |
| pkgPath string |
| embedded bool |
| } |
| |
| checkPkgPath := func(name string, s []pkgpathTest) { |
| for _, test := range s { |
| f := typ.FieldByIndex(test.index) |
| if got, want := f.PkgPath, test.pkgPath; got != want { |
| t.Errorf("%s: Field(%d).PkgPath = %q, want %q", name, test.index, got, want) |
| } |
| if got, want := f.Anonymous, test.embedded; got != want { |
| t.Errorf("%s: Field(%d).Anonymous = %v, want %v", name, test.index, got, want) |
| } |
| } |
| } |
| |
| checkPkgPath("testStruct", []pkgpathTest{ |
| {[]int{0}, "", false}, // Exported |
| {[]int{1}, "reflect_test", false}, // unexported |
| {[]int{2}, "", true}, // OtherPkgFields |
| {[]int{2, 0}, "", false}, // OtherExported |
| {[]int{2, 1}, "reflect", false}, // otherUnexported |
| {[]int{3}, "reflect_test", true}, // int |
| {[]int{4}, "reflect_test", true}, // *x |
| }) |
| |
| type localOtherPkgFields OtherPkgFields |
| typ = TypeOf(localOtherPkgFields{}) |
| checkPkgPath("localOtherPkgFields", []pkgpathTest{ |
| {[]int{0}, "", false}, // OtherExported |
| {[]int{1}, "reflect", false}, // otherUnexported |
| }) |
| } |
| |
| func TestVariadicType(t *testing.T) { |
| // Test example from Type documentation. |
| var f func(x int, y ...float64) |
| typ := TypeOf(f) |
| if typ.NumIn() == 2 && typ.In(0) == TypeOf(int(0)) { |
| sl := typ.In(1) |
| if sl.Kind() == Slice { |
| if sl.Elem() == TypeOf(0.0) { |
| // ok |
| return |
| } |
| } |
| } |
| |
| // Failed |
| t.Errorf("want NumIn() = 2, In(0) = int, In(1) = []float64") |
| s := fmt.Sprintf("have NumIn() = %d", typ.NumIn()) |
| for i := 0; i < typ.NumIn(); i++ { |
| s += fmt.Sprintf(", In(%d) = %s", i, typ.In(i)) |
| } |
| t.Error(s) |
| } |
| |
| type inner struct { |
| x int |
| } |
| |
| type outer struct { |
| y int |
| inner |
| } |
| |
| func (*inner) M() {} |
| func (*outer) M() {} |
| |
| func TestNestedMethods(t *testing.T) { |
| typ := TypeOf((*outer)(nil)) |
| if typ.NumMethod() != 1 || typ.Method(0).Func.Pointer() != ValueOf((*outer).M).Pointer() { |
| t.Errorf("Wrong method table for outer: (M=%p)", (*outer).M) |
| for i := 0; i < typ.NumMethod(); i++ { |
| m := typ.Method(i) |
| t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Pointer()) |
| } |
| } |
| } |
| |
| type unexp struct{} |
| |
| func (*unexp) f() (int32, int8) { return 7, 7 } |
| func (*unexp) g() (int64, int8) { return 8, 8 } |
| |
| type unexpI interface { |
| f() (int32, int8) |
| } |
| |
| var unexpi unexpI = new(unexp) |
| |
| func TestUnexportedMethods(t *testing.T) { |
| typ := TypeOf(unexpi) |
| |
| if got := typ.NumMethod(); got != 0 { |
| t.Errorf("NumMethod=%d, want 0 satisfied methods", got) |
| } |
| } |
| |
| type InnerInt struct { |
| X int |
| } |
| |
| type OuterInt struct { |
| Y int |
| InnerInt |
| } |
| |
| func (i *InnerInt) M() int { |
| return i.X |
| } |
| |
| func TestEmbeddedMethods(t *testing.T) { |
| typ := TypeOf((*OuterInt)(nil)) |
| if typ.NumMethod() != 1 || typ.Method(0).Func.Pointer() != ValueOf((*OuterInt).M).Pointer() { |
| t.Errorf("Wrong method table for OuterInt: (m=%p)", (*OuterInt).M) |
| for i := 0; i < typ.NumMethod(); i++ { |
| m := typ.Method(i) |
| t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Pointer()) |
| } |
| } |
| |
| i := &InnerInt{3} |
| if v := ValueOf(i).Method(0).Call(nil)[0].Int(); v != 3 { |
| t.Errorf("i.M() = %d, want 3", v) |
| } |
| |
| o := &OuterInt{1, InnerInt{2}} |
| if v := ValueOf(o).Method(0).Call(nil)[0].Int(); v != 2 { |
| t.Errorf("i.M() = %d, want 2", v) |
| } |
| |
| f := (*OuterInt).M |
| if v := f(o); v != 2 { |
| t.Errorf("f(o) = %d, want 2", v) |
| } |
| } |
| |
| type FuncDDD func(...interface{}) error |
| |
| func (f FuncDDD) M() {} |
| |
| func TestNumMethodOnDDD(t *testing.T) { |
| rv := ValueOf((FuncDDD)(nil)) |
| if n := rv.NumMethod(); n != 1 { |
| t.Fatalf("NumMethod()=%d, want 1", n) |
| } |
| } |
| |
| func TestPtrTo(t *testing.T) { |
| // This block of code means that the ptrToThis field of the |
| // reflect data for *unsafe.Pointer is non zero, see |
| // https://golang.org/issue/19003 |
| var x unsafe.Pointer |
| var y = &x |
| var z = &y |
| |
| var i int |
| |
| typ := TypeOf(z) |
| for i = 0; i < 100; i++ { |
| typ = PtrTo(typ) |
| } |
| for i = 0; i < 100; i++ { |
| typ = typ.Elem() |
| } |
| if typ != TypeOf(z) { |
| t.Errorf("after 100 PtrTo and Elem, have %s, want %s", typ, TypeOf(z)) |
| } |
| } |
| |
| func TestPtrToGC(t *testing.T) { |
| type T *uintptr |
| tt := TypeOf(T(nil)) |
| pt := PtrTo(tt) |
| const n = 100 |
| var x []interface{} |
| for i := 0; i < n; i++ { |
| v := New(pt) |
| p := new(*uintptr) |
| *p = new(uintptr) |
| **p = uintptr(i) |
| v.Elem().Set(ValueOf(p).Convert(pt)) |
| x = append(x, v.Interface()) |
| } |
| runtime.GC() |
| |
| for i, xi := range x { |
| k := ValueOf(xi).Elem().Elem().Elem().Interface().(uintptr) |
| if k != uintptr(i) { |
| t.Errorf("lost x[%d] = %d, want %d", i, k, i) |
| } |
| } |
| } |
| |
| func BenchmarkPtrTo(b *testing.B) { |
| // Construct a type with a zero ptrToThis. |
| type T struct{ int } |
| t := SliceOf(TypeOf(T{})) |
| ptrToThis := ValueOf(t).Elem().FieldByName("ptrToThis") |
| if !ptrToThis.IsValid() { |
| b.Fatalf("%v has no ptrToThis field; was it removed from rtype?", t) |
| } |
| if ptrToThis.Int() != 0 { |
| b.Fatalf("%v.ptrToThis unexpectedly nonzero", t) |
| } |
| b.ResetTimer() |
| |
| // Now benchmark calling PtrTo on it: we'll have to hit the ptrMap cache on |
| // every call. |
| b.RunParallel(func(pb *testing.PB) { |
| for pb.Next() { |
| PtrTo(t) |
| } |
| }) |
| } |
| |
| func TestAddr(t *testing.T) { |
| var p struct { |
| X, Y int |
| } |
| |
| v := ValueOf(&p) |
| v = v.Elem() |
| v = v.Addr() |
| v = v.Elem() |
| v = v.Field(0) |
| v.SetInt(2) |
| if p.X != 2 { |
| t.Errorf("Addr.Elem.Set failed to set value") |
| } |
| |
| // Again but take address of the ValueOf value. |
| // Exercises generation of PtrTypes not present in the binary. |
| q := &p |
| v = ValueOf(&q).Elem() |
| v = v.Addr() |
| v = v.Elem() |
| v = v.Elem() |
| v = v.Addr() |
| v = v.Elem() |
| v = v.Field(0) |
| v.SetInt(3) |
| if p.X != 3 { |
| t.Errorf("Addr.Elem.Set failed to set value") |
| } |
| |
| // Starting without pointer we should get changed value |
| // in interface. |
| qq := p |
| v = ValueOf(&qq).Elem() |
| v0 := v |
| v = v.Addr() |
| v = v.Elem() |
| v = v.Field(0) |
| v.SetInt(4) |
| if p.X != 3 { // should be unchanged from last time |
| t.Errorf("somehow value Set changed original p") |
| } |
| p = v0.Interface().(struct { |
| X, Y int |
| }) |
| if p.X != 4 { |
| t.Errorf("Addr.Elem.Set valued to set value in top value") |
| } |
| |
| // Verify that taking the address of a type gives us a pointer |
| // which we can convert back using the usual interface |
| // notation. |
| var s struct { |
| B *bool |
| } |
| ps := ValueOf(&s).Elem().Field(0).Addr().Interface() |
| *(ps.(**bool)) = new(bool) |
| if s.B == nil { |
| t.Errorf("Addr.Interface direct assignment failed") |
| } |
| } |
| |
| func noAlloc(t *testing.T, n int, f func(int)) { |
| if testing.Short() { |
| t.Skip("skipping malloc count in short mode") |
| } |
| if runtime.GOMAXPROCS(0) > 1 { |
| t.Skip("skipping; GOMAXPROCS>1") |
| } |
| i := -1 |
| allocs := testing.AllocsPerRun(n, func() { |
| f(i) |
| i++ |
| }) |
| if allocs > 0 { |
| t.Errorf("%d iterations: got %v mallocs, want 0", n, allocs) |
| } |
| } |
| |
| func TestAllocations(t *testing.T) { |
| noAlloc(t, 100, func(j int) { |
| var i interface{} |
| var v Value |
| |
| // We can uncomment this when compiler escape analysis |
| // is good enough to see that the integer assigned to i |
| // does not escape and therefore need not be allocated. |
| // |
| // i = 42 + j |
| // v = ValueOf(i) |
| // if int(v.Int()) != 42+j { |
| // panic("wrong int") |
| // } |
| |
| i = func(j int) int { return j } |
| v = ValueOf(i) |
| if v.Interface().(func(int) int)(j) != j { |
| panic("wrong result") |
| } |
| }) |
| } |
| |
| func TestSmallNegativeInt(t *testing.T) { |
| i := int16(-1) |
| v := ValueOf(i) |
| if v.Int() != -1 { |
| t.Errorf("int16(-1).Int() returned %v", v.Int()) |
| } |
| } |
| |
| func TestIndex(t *testing.T) { |
| xs := []byte{1, 2, 3, 4, 5, 6, 7, 8} |
| v := ValueOf(xs).Index(3).Interface().(byte) |
| if v != xs[3] { |
| t.Errorf("xs.Index(3) = %v; expected %v", v, xs[3]) |
| } |
| xa := [8]byte{10, 20, 30, 40, 50, 60, 70, 80} |
| v = ValueOf(xa).Index(2).Interface().(byte) |
| if v != xa[2] { |
| t.Errorf("xa.Index(2) = %v; expected %v", v, xa[2]) |
| } |
| s := "0123456789" |
| v = ValueOf(s).Index(3).Interface().(byte) |
| if v != s[3] { |
| t.Errorf("s.Index(3) = %v; expected %v", v, s[3]) |
| } |
| } |
| |
| func TestSlice(t *testing.T) { |
| xs := []int{1, 2, 3, 4, 5, 6, 7, 8} |
| v := ValueOf(xs).Slice(3, 5).Interface().([]int) |
| if len(v) != 2 { |
| t.Errorf("len(xs.Slice(3, 5)) = %d", len(v)) |
| } |
| if cap(v) != 5 { |
| t.Errorf("cap(xs.Slice(3, 5)) = %d", cap(v)) |
| } |
| if !DeepEqual(v[0:5], xs[3:]) { |
| t.Errorf("xs.Slice(3, 5)[0:5] = %v", v[0:5]) |
| } |
| xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} |
| v = ValueOf(&xa).Elem().Slice(2, 5).Interface().([]int) |
| if len(v) != 3 { |
| t.Errorf("len(xa.Slice(2, 5)) = %d", len(v)) |
| } |
| if cap(v) != 6 { |
| t.Errorf("cap(xa.Slice(2, 5)) = %d", cap(v)) |
| } |
| if !DeepEqual(v[0:6], xa[2:]) { |
| t.Errorf("xs.Slice(2, 5)[0:6] = %v", v[0:6]) |
| } |
| s := "0123456789" |
| vs := ValueOf(s).Slice(3, 5).Interface().(string) |
| if vs != s[3:5] { |
| t.Errorf("s.Slice(3, 5) = %q; expected %q", vs, s[3:5]) |
| } |
| |
| rv := ValueOf(&xs).Elem() |
| rv = rv.Slice(3, 4) |
| ptr2 := rv.Pointer() |
| rv = rv.Slice(5, 5) |
| ptr3 := rv.Pointer() |
| if ptr3 != ptr2 { |
| t.Errorf("xs.Slice(3,4).Slice3(5,5).Pointer() = %#x, want %#x", ptr3, ptr2) |
| } |
| } |
| |
| func TestSlice3(t *testing.T) { |
| xs := []int{1, 2, 3, 4, 5, 6, 7, 8} |
| v := ValueOf(xs).Slice3(3, 5, 7).Interface().([]int) |
| if len(v) != 2 { |
| t.Errorf("len(xs.Slice3(3, 5, 7)) = %d", len(v)) |
| } |
| if cap(v) != 4 { |
| t.Errorf("cap(xs.Slice3(3, 5, 7)) = %d", cap(v)) |
| } |
| if !DeepEqual(v[0:4], xs[3:7:7]) { |
| t.Errorf("xs.Slice3(3, 5, 7)[0:4] = %v", v[0:4]) |
| } |
| rv := ValueOf(&xs).Elem() |
| shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) }) |
| shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) }) |
| shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) }) |
| |
| xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} |
| v = ValueOf(&xa).Elem().Slice3(2, 5, 6).Interface().([]int) |
| if len(v) != 3 { |
| t.Errorf("len(xa.Slice(2, 5, 6)) = %d", len(v)) |
| } |
| if cap(v) != 4 { |
| t.Errorf("cap(xa.Slice(2, 5, 6)) = %d", cap(v)) |
| } |
| if !DeepEqual(v[0:4], xa[2:6:6]) { |
| t.Errorf("xs.Slice(2, 5, 6)[0:4] = %v", v[0:4]) |
| } |
| rv = ValueOf(&xa).Elem() |
| shouldPanic("Slice3", func() { rv.Slice3(1, 2, 1) }) |
| shouldPanic("Slice3", func() { rv.Slice3(1, 1, 11) }) |
| shouldPanic("Slice3", func() { rv.Slice3(2, 2, 1) }) |
| |
| s := "hello world" |
| rv = ValueOf(&s).Elem() |
| shouldPanic("Slice3", func() { rv.Slice3(1, 2, 3) }) |
| |
| rv = ValueOf(&xs).Elem() |
| rv = rv.Slice3(3, 5, 7) |
| ptr2 := rv.Pointer() |
| rv = rv.Slice3(4, 4, 4) |
| ptr3 := rv.Pointer() |
| if ptr3 != ptr2 { |
| t.Errorf("xs.Slice3(3,5,7).Slice3(4,4,4).Pointer() = %#x, want %#x", ptr3, ptr2) |
| } |
| } |
| |
| func TestSetLenCap(t *testing.T) { |
| xs := []int{1, 2, 3, 4, 5, 6, 7, 8} |
| xa := [8]int{10, 20, 30, 40, 50, 60, 70, 80} |
| |
| vs := ValueOf(&xs).Elem() |
| shouldPanic("SetLen", func() { vs.SetLen(10) }) |
| shouldPanic("SetCap", func() { vs.SetCap(10) }) |
| shouldPanic("SetLen", func() { vs.SetLen(-1) }) |
| shouldPanic("SetCap", func() { vs.SetCap(-1) }) |
| shouldPanic("SetCap", func() { vs.SetCap(6) }) // smaller than len |
| vs.SetLen(5) |
| if len(xs) != 5 || cap(xs) != 8 { |
| t.Errorf("after SetLen(5), len, cap = %d, %d, want 5, 8", len(xs), cap(xs)) |
| } |
| vs.SetCap(6) |
| if len(xs) != 5 || cap(xs) != 6 { |
| t.Errorf("after SetCap(6), len, cap = %d, %d, want 5, 6", len(xs), cap(xs)) |
| } |
| vs.SetCap(5) |
| if len(xs) != 5 || cap(xs) != 5 { |
| t.Errorf("after SetCap(5), len, cap = %d, %d, want 5, 5", len(xs), cap(xs)) |
| } |
| shouldPanic("SetCap", func() { vs.SetCap(4) }) // smaller than len |
| shouldPanic("SetLen", func() { vs.SetLen(6) }) // bigger than cap |
| |
| va := ValueOf(&xa).Elem() |
| shouldPanic("SetLen", func() { va.SetLen(8) }) |
| shouldPanic("SetCap", func() { va.SetCap(8) }) |
| } |
| |
| func TestVariadic(t *testing.T) { |
| var b bytes.Buffer |
| V := ValueOf |
| |
| b.Reset() |
| V(fmt.Fprintf).Call([]Value{V(&b), V("%s, %d world"), V("hello"), V(42)}) |
| if b.String() != "hello, 42 world" { |
| t.Errorf("after Fprintf Call: %q != %q", b.String(), "hello 42 world") |
| } |
| |
| b.Reset() |
| V(fmt.Fprintf).CallSlice([]Value{V(&b), V("%s, %d world"), V([]interface{}{"hello", 42})}) |
| if b.String() != "hello, 42 world" { |
| t.Errorf("after Fprintf CallSlice: %q != %q", b.String(), "hello 42 world") |
| } |
| } |
| |
| func TestFuncArg(t *testing.T) { |
| f1 := func(i int, f func(int) int) int { return f(i) } |
| f2 := func(i int) int { return i + 1 } |
| r := ValueOf(f1).Call([]Value{ValueOf(100), ValueOf(f2)}) |
| if r[0].Int() != 101 { |
| t.Errorf("function returned %d, want 101", r[0].Int()) |
| } |
| } |
| |
| func TestStructArg(t *testing.T) { |
| type padded struct { |
| B string |
| C int32 |
| } |
| var ( |
| gotA padded |
| gotB uint32 |
| wantA = padded{"3", 4} |
| wantB = uint32(5) |
| ) |
| f := func(a padded, b uint32) { |
| gotA, gotB = a, b |
| } |
| ValueOf(f).Call([]Value{ValueOf(wantA), ValueOf(wantB)}) |
| if gotA != wantA || gotB != wantB { |
| t.Errorf("function called with (%v, %v), want (%v, %v)", gotA, gotB, wantA, wantB) |
| } |
| } |
| |
| var tagGetTests = []struct { |
| Tag StructTag |
| Key string |
| Value string |
| }{ |
| {`protobuf:"PB(1,2)"`, `protobuf`, `PB(1,2)`}, |
| {`protobuf:"PB(1,2)"`, `foo`, ``}, |
| {`protobuf:"PB(1,2)"`, `rotobuf`, ``}, |
| {`protobuf:"PB(1,2)" json:"name"`, `json`, `name`}, |
| {`protobuf:"PB(1,2)" json:"name"`, `protobuf`, `PB(1,2)`}, |
| {`k0:"values contain spaces" k1:"and\ttabs"`, "k0", "values contain spaces"}, |
| {`k0:"values contain spaces" k1:"and\ttabs"`, "k1", "and\ttabs"}, |
| } |
| |
| func TestTagGet(t *testing.T) { |
| for _, tt := range tagGetTests { |
| if v := tt.Tag.Get(tt.Key); v != tt.Value { |
| t.Errorf("StructTag(%#q).Get(%#q) = %#q, want %#q", tt.Tag, tt.Key, v, tt.Value) |
| } |
| } |
| } |
| |
| func TestBytes(t *testing.T) { |
| type B []byte |
| x := B{1, 2, 3, 4} |
| y := ValueOf(x).Bytes() |
| if !bytes.Equal(x, y) { |
| t.Fatalf("ValueOf(%v).Bytes() = %v", x, y) |
| } |
| if &x[0] != &y[0] { |
| t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0]) |
| } |
| } |
| |
| func TestSetBytes(t *testing.T) { |
| type B []byte |
| var x B |
| y := []byte{1, 2, 3, 4} |
| ValueOf(&x).Elem().SetBytes(y) |
| if !bytes.Equal(x, y) { |
| t.Fatalf("ValueOf(%v).Bytes() = %v", x, y) |
| } |
| if &x[0] != &y[0] { |
| t.Errorf("ValueOf(%p).Bytes() = %p", &x[0], &y[0]) |
| } |
| } |
| |
| type Private struct { |
| x int |
| y **int |
| Z int |
| } |
| |
| func (p *Private) m() { |
| } |
| |
| type private struct { |
| Z int |
| z int |
| S string |
| A [1]Private |
| T []Private |
| } |
| |
| func (p *private) P() { |
| } |
| |
| type Public struct { |
| X int |
| Y **int |
| private |
| } |
| |
| func (p *Public) M() { |
| } |
| |
| func TestUnexported(t *testing.T) { |
| var pub Public |
| pub.S = "S" |
| pub.T = pub.A[:] |
| v := ValueOf(&pub) |
| isValid(v.Elem().Field(0)) |
| isValid(v.Elem().Field(1)) |
| isValid(v.Elem().Field(2)) |
| isValid(v.Elem().FieldByName("X")) |
| isValid(v.Elem().FieldByName("Y")) |
| isValid(v.Elem().FieldByName("Z")) |
| isValid(v.Type().Method(0).Func) |
| m, _ := v.Type().MethodByName("M") |
| isValid(m.Func) |
| m, _ = v.Type().MethodByName("P") |
| isValid(m.Func) |
| isNonNil(v.Elem().Field(0).Interface()) |
| isNonNil(v.Elem().Field(1).Interface()) |
| isNonNil(v.Elem().Field(2).Field(2).Index(0)) |
| isNonNil(v.Elem().FieldByName("X").Interface()) |
| isNonNil(v.Elem().FieldByName("Y").Interface()) |
| isNonNil(v.Elem().FieldByName("Z").Interface()) |
| isNonNil(v.Elem().FieldByName("S").Index(0).Interface()) |
| isNonNil(v.Type().Method(0).Func.Interface()) |
| m, _ = v.Type().MethodByName("P") |
| isNonNil(m.Func.Interface()) |
| |
| var priv Private |
| v = ValueOf(&priv) |
| isValid(v.Elem().Field(0)) |
| isValid(v.Elem().Field(1)) |
| isValid(v.Elem().FieldByName("x")) |
| isValid(v.Elem().FieldByName("y")) |
| shouldPanic("Interface", func() { v.Elem().Field(0).Interface() }) |
| shouldPanic("Interface", func() { v.Elem().Field(1).Interface() }) |
| shouldPanic("Interface", func() { v.Elem().FieldByName("x").Interface() }) |
| shouldPanic("Interface", func() { v.Elem().FieldByName("y").Interface() }) |
| shouldPanic("Method", func() { v.Type().Method(0) }) |
| } |
| |
| func TestSetPanic(t *testing.T) { |
| ok := func(f func()) { f() } |
| bad := func(f func()) { shouldPanic("Set", f) } |
| clear := func(v Value) { v.Set(Zero(v.Type())) } |
| |
| type t0 struct { |
| W int |
| } |
| |
| type t1 struct { |
| Y int |
| t0 |
| } |
| |
| type T2 struct { |
| Z int |
| namedT0 t0 |
| } |
| |
| type T struct { |
| X int |
| t1 |
| T2 |
| NamedT1 t1 |
| NamedT2 T2 |
| namedT1 t1 |
| namedT2 T2 |
| } |
| |
| // not addressable |
| v := ValueOf(T{}) |
| bad(func() { clear(v.Field(0)) }) // .X |
| bad(func() { clear(v.Field(1)) }) // .t1 |
| bad(func() { clear(v.Field(1).Field(0)) }) // .t1.Y |
| bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0 |
| bad(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W |
| bad(func() { clear(v.Field(2)) }) // .T2 |
| bad(func() { clear(v.Field(2).Field(0)) }) // .T2.Z |
| bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0 |
| bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W |
| bad(func() { clear(v.Field(3)) }) // .NamedT1 |
| bad(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y |
| bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0 |
| bad(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W |
| bad(func() { clear(v.Field(4)) }) // .NamedT2 |
| bad(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z |
| bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0 |
| bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W |
| bad(func() { clear(v.Field(5)) }) // .namedT1 |
| bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y |
| bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0 |
| bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W |
| bad(func() { clear(v.Field(6)) }) // .namedT2 |
| bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z |
| bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0 |
| bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W |
| |
| // addressable |
| v = ValueOf(&T{}).Elem() |
| ok(func() { clear(v.Field(0)) }) // .X |
| bad(func() { clear(v.Field(1)) }) // .t1 |
| ok(func() { clear(v.Field(1).Field(0)) }) // .t1.Y |
| bad(func() { clear(v.Field(1).Field(1)) }) // .t1.t0 |
| ok(func() { clear(v.Field(1).Field(1).Field(0)) }) // .t1.t0.W |
| ok(func() { clear(v.Field(2)) }) // .T2 |
| ok(func() { clear(v.Field(2).Field(0)) }) // .T2.Z |
| bad(func() { clear(v.Field(2).Field(1)) }) // .T2.namedT0 |
| bad(func() { clear(v.Field(2).Field(1).Field(0)) }) // .T2.namedT0.W |
| ok(func() { clear(v.Field(3)) }) // .NamedT1 |
| ok(func() { clear(v.Field(3).Field(0)) }) // .NamedT1.Y |
| bad(func() { clear(v.Field(3).Field(1)) }) // .NamedT1.t0 |
| ok(func() { clear(v.Field(3).Field(1).Field(0)) }) // .NamedT1.t0.W |
| ok(func() { clear(v.Field(4)) }) // .NamedT2 |
| ok(func() { clear(v.Field(4).Field(0)) }) // .NamedT2.Z |
| bad(func() { clear(v.Field(4).Field(1)) }) // .NamedT2.namedT0 |
| bad(func() { clear(v.Field(4).Field(1).Field(0)) }) // .NamedT2.namedT0.W |
| bad(func() { clear(v.Field(5)) }) // .namedT1 |
| bad(func() { clear(v.Field(5).Field(0)) }) // .namedT1.Y |
| bad(func() { clear(v.Field(5).Field(1)) }) // .namedT1.t0 |
| bad(func() { clear(v.Field(5).Field(1).Field(0)) }) // .namedT1.t0.W |
| bad(func() { clear(v.Field(6)) }) // .namedT2 |
| bad(func() { clear(v.Field(6).Field(0)) }) // .namedT2.Z |
| bad(func() { clear(v.Field(6).Field(1)) }) // .namedT2.namedT0 |
| bad(func() { clear(v.Field(6).Field(1).Field(0)) }) // .namedT2.namedT0.W |
| } |
| |
| type timp int |
| |
| func (t timp) W() {} |
| func (t timp) Y() {} |
| func (t timp) w() {} |
| func (t timp) y() {} |
| |
| func TestCallPanic(t *testing.T) { |
| type t0 interface { |
| W() |
| w() |
| } |
| type T1 interface { |
| Y() |
| y() |
| } |
| type T2 struct { |
| T1 |
| t0 |
| } |
| type T struct { |
| t0 // 0 |
| T1 // 1 |
| |
| NamedT0 t0 // 2 |
| NamedT1 T1 // 3 |
| NamedT2 T2 // 4 |
| |
| namedT0 t0 // 5 |
| namedT1 T1 // 6 |
| namedT2 T2 // 7 |
| } |
| ok := func(f func()) { f() } |
| badCall := func(f func()) { shouldPanic("Call", f) } |
| badMethod := func(f func()) { shouldPanic("Method", f) } |
| call := func(v Value) { v.Call(nil) } |
| |
| i := timp(0) |
| v := ValueOf(T{i, i, i, i, T2{i, i}, i, i, T2{i, i}}) |
| badCall(func() { call(v.Field(0).Method(0)) }) // .t0.W |
| badCall(func() { call(v.Field(0).Elem().Method(0)) }) // .t0.W |
| badCall(func() { call(v.Field(0).Method(1)) }) // .t0.w |
| badMethod(func() { call(v.Field(0).Elem().Method(2)) }) // .t0.w |
| ok(func() { call(v.Field(1).Method(0)) }) // .T1.Y |
| ok(func() { call(v.Field(1).Elem().Method(0)) }) // .T1.Y |
| badCall(func() { call(v.Field(1).Method(1)) }) // .T1.y |
| badMethod(func() { call(v.Field(1).Elem().Method(2)) }) // .T1.y |
| |
| ok(func() { call(v.Field(2).Method(0)) }) // .NamedT0.W |
| ok(func() { call(v.Field(2).Elem().Method(0)) }) // .NamedT0.W |
| badCall(func() { call(v.Field(2).Method(1)) }) // .NamedT0.w |
| badMethod(func() { call(v.Field(2).Elem().Method(2)) }) // .NamedT0.w |
| |
| ok(func() { call(v.Field(3).Method(0)) }) // .NamedT1.Y |
| ok(func() { call(v.Field(3).Elem().Method(0)) }) // .NamedT1.Y |
| badCall(func() { call(v.Field(3).Method(1)) }) // .NamedT1.y |
| badMethod(func() { call(v.Field(3).Elem().Method(3)) }) // .NamedT1.y |
| |
| ok(func() { call(v.Field(4).Field(0).Method(0)) }) // .NamedT2.T1.Y |
| ok(func() { call(v.Field(4).Field(0).Elem().Method(0)) }) // .NamedT2.T1.W |
| badCall(func() { call(v.Field(4).Field(1).Method(0)) }) // .NamedT2.t0.W |
| badCall(func() { call(v.Field(4).Field(1).Elem().Method(0)) }) // .NamedT2.t0.W |
| |
| badCall(func() { call(v.Field(5).Method(0)) }) // .namedT0.W |
| badCall(func() { call(v.Field(5).Elem().Method(0)) }) // .namedT0.W |
| badCall(func() { call(v.Field(5).Method(1)) }) // .namedT0.w |
| badMethod(func() { call(v.Field(5).Elem().Method(2)) }) // .namedT0.w |
| |
| badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.Y |
| badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.Y |
| badCall(func() { call(v.Field(6).Method(0)) }) // .namedT1.y |
| badCall(func() { call(v.Field(6).Elem().Method(0)) }) // .namedT1.y |
| |
| badCall(func() { call(v.Field(7).Field(0).Method(0)) }) // .namedT2.T1.Y |
| badCall(func() { call(v.Field(7).Field(0).Elem().Method(0)) }) // .namedT2.T1.W |
| badCall(func() { call(v.Field(7).Field(1).Method(0)) }) // .namedT2.t0.W |
| badCall(func() { call(v.Field(7).Field(1).Elem().Method(0)) }) // .namedT2.t0.W |
| } |
| |
| func shouldPanic(expect string, f func()) { |
| defer func() { |
| r := recover() |
| if r == nil { |
| panic("did not panic") |
| } |
| if expect != "" { |
| var s string |
| switch r := r.(type) { |
| case string: |
| s = r |
| case *ValueError: |
| s = r.Error() |
| default: |
| panic(fmt.Sprintf("panicked with unexpected type %T", r)) |
| } |
| if !strings.HasPrefix(s, "reflect") { |
| panic(`panic string does not start with "reflect": ` + s) |
| } |
| if !strings.Contains(s, expect) { |
| panic(`panic string does not contain "` + expect + `": ` + s) |
| } |
| } |
| }() |
| f() |
| } |
| |
| func isNonNil(x interface{}) { |
| if x == nil { |
| panic("nil interface") |
| } |
| } |
| |
| func isValid(v Value) { |
| if !v.IsValid() { |
| panic("zero Value") |
| } |
| } |
| |
| func TestAlias(t *testing.T) { |
| x := string("hello") |
| v := ValueOf(&x).Elem() |
| oldvalue := v.Interface() |
| v.SetString("world") |
| newvalue := v.Interface() |
| |
| if oldvalue != "hello" || newvalue != "world" { |
| t.Errorf("aliasing: old=%q new=%q, want hello, world", oldvalue, newvalue) |
| } |
| } |
| |
| var V = ValueOf |
| |
| func EmptyInterfaceV(x interface{}) Value { |
| return ValueOf(&x).Elem() |
| } |
| |
| func ReaderV(x io.Reader) Value { |
| return ValueOf(&x).Elem() |
| } |
| |
| func ReadWriterV(x io.ReadWriter) Value { |
| return ValueOf(&x).Elem() |
| } |
| |
| type Empty struct{} |
| type MyStruct struct { |
| x int `some:"tag"` |
| } |
| type MyString string |
| type MyBytes []byte |
| type MyRunes []int32 |
| type MyFunc func() |
| type MyByte byte |
| |
| type IntChan chan int |
| type IntChanRecv <-chan int |
| type IntChanSend chan<- int |
| type BytesChan chan []byte |
| type BytesChanRecv <-chan []byte |
| type BytesChanSend chan<- []byte |
| |
| var convertTests = []struct { |
| in Value |
| out Value |
| }{ |
| // numbers |
| /* |
| Edit .+1,/\*\//-1>cat >/tmp/x.go && go run /tmp/x.go |
| |
| package main |
| |
| import "fmt" |
| |
| var numbers = []string{ |
| "int8", "uint8", "int16", "uint16", |
| "int32", "uint32", "int64", "uint64", |
| "int", "uint", "uintptr", |
| "float32", "float64", |
| } |
| |
| func main() { |
| // all pairs but in an unusual order, |
| // to emit all the int8, uint8 cases |
| // before n grows too big. |
| n := 1 |
| for i, f := range numbers { |
| for _, g := range numbers[i:] { |
| fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", f, n, g, n) |
| n++ |
| if f != g { |
| fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", g, n, f, n) |
| n++ |
| } |
| } |
| } |
| } |
| */ |
| {V(int8(1)), V(int8(1))}, |
| {V(int8(2)), V(uint8(2))}, |
| {V(uint8(3)), V(int8(3))}, |
| {V(int8(4)), V(int16(4))}, |
| {V(int16(5)), V(int8(5))}, |
| {V(int8(6)), V(uint16(6))}, |
| {V(uint16(7)), V(int8(7))}, |
| {V(int8(8)), V(int32(8))}, |
| {V(int32(9)), V(int8(9))}, |
| {V(int8(10)), V(uint32(10))}, |
| {V(uint32(11)), V(int8(11))}, |
| {V(int8(12)), V(int64(12))}, |
| {V(int64(13)), V(int8(13))}, |
| {V(int8(14)), V(uint64(14))}, |
| {V(uint64(15)), V(int8(15))}, |
| {V(int8(16)), V(int(16))}, |
| {V(int(17)), V(int8(17))}, |
| {V(int8(18)), V(uint(18))}, |
| {V(uint(19)), V(int8(19))}, |
| {V(int8(20)), V(uintptr(20))}, |
| {V(uintptr(21)), V(int8(21))}, |
| {V(int8(22)), V(float32(22))}, |
| {V(float32(23)), V(int8(23))}, |
| {V(int8(24)), V(float64(24))}, |
| {V(float64(25)), V(int8(25))}, |
| {V(uint8(26)), V(uint8(26))}, |
| {V(uint8(27)), V(int16(27))}, |
| {V(int16(28)), V(uint8(28))}, |
| {V(uint8(29)), V(uint16(29))}, |
| {V(uint16(30)), V(uint8(30))}, |
| {V(uint8(31)), V(int32(31))}, |
| {V(int32(32)), V(uint8(32))}, |
| {V(uint8(33)), V(uint32(33))}, |
| {V(uint32(34)), V(uint8(34))}, |
| {V(uint8(35)), V(int64(35))}, |
| {V(int64(36)), V(uint8(36))}, |
| {V(uint8(37)), V(uint64(37))}, |
| {V(uint64(38)), V(uint8(38))}, |
| {V(uint8(39)), V(int(39))}, |
| {V(int(40)), V(uint8(40))}, |
| {V(uint8(41)), V(uint(41))}, |
| {V(uint(42)), V(uint8(42))}, |
| {V(uint8(43)), V(uintptr(43))}, |
| {V(uintptr(44)), V(uint8(44))}, |
| {V(uint8(45)), V(float32(45))}, |
| {V(float32(46)), V(uint8(46))}, |
| {V(uint8(47)), V(float64(47))}, |
| {V(float64(48)), V(uint8(48))}, |
| {V(int16(49)), V(int16(49))}, |
| {V(int16(50)), V(uint16(50))}, |
| {V(uint16(51)), V(int16(51))}, |
| {V(int16(52)), V(int32(52))}, |
| {V(int32(53)), V(int16(53))}, |
| {V(int16(54)), V(uint32(54))}, |
| {V(uint32(55)), V(int16(55))}, |
| {V(int16(56)), V(int64(56))}, |
| {V(int64(57)), V(int16(57))}, |
| {V(int16(58)), V(uint64(58))}, |
| {V(uint64(59)), V(int16(59))}, |
| {V(int16(60)), V(int(60))}, |
| {V(int(61)), V(int16(61))}, |
| {V(int16(62)), V(uint(62))}, |
| {V(uint(63)), V(int16(63))}, |
| {V(int16(64)), V(uintptr(64))}, |
| {V(uintptr(65)), V(int16(65))}, |
| {V(int16(66)), V(float32(66))}, |
| {V(float32(67)), V(int16(67))}, |
| {V(int16(68)), V(float64(68))}, |
| {V(float64(69)), V(int16(69))}, |
| {V(uint16(70)), V(uint16(70))}, |
| {V(uint16(71)), V(int32(71))}, |
| {V(int32(72)), V(uint16(72))}, |
| {V(uint16(73)), V(uint32(73))}, |
| {V(uint32(74)), V(uint16(74))}, |
| {V(uint16(75)), V(int64(75))}, |
| {V(int64(76)), V(uint16(76))}, |
| {V(uint16(77)), V(uint64(77))}, |
| {V(uint64(78)), V(uint16(78))}, |
| {V(uint16(79)), V(int(79))}, |
| {V(int(80)), V(uint16(80))}, |
| {V(uint16(81)), V(uint(81))}, |
| {V(uint(82)), V(uint16(82))}, |
| {V(uint16(83)), V(uintptr(83))}, |
| {V(uintptr(84)), V(uint16(84))}, |
| {V(uint16(85)), V(float32(85))}, |
| {V(float32(86)), V(uint16(86))}, |
| {V(uint16(87)), V(float64(87))}, |
| {V(float64(88)), V(uint16(88))}, |
| {V(int32(89)), V(int32(89))}, |
| {V(int32(90)), V(uint32(90))}, |
| {V(uint32(91)), V(int32(91))}, |
| {V(int32(92)), V(int64(92))}, |
| {V(int64(93)), V(int32(93))}, |
| {V(int32(94)), V(uint64(94))}, |
| {V(uint64(95)), V(int32(95))}, |
| {V(int32(96)), V(int(96))}, |
| {V(int(97)), V(int32(97))}, |
| {V(int32(98)), V(uint(98))}, |
| {V(uint(99)), V(int32(99))}, |
| {V(int32(100)), V(uintptr(100))}, |
| {V(uintptr(101)), V(int32(101))}, |
| {V(int32(102)), V(float32(102))}, |
| {V(float32(103)), V(int32(103))}, |
| {V(int32(104)), V(float64(104))}, |
| {V(float64(105)), V(int32(105))}, |
| {V(uint32(106)), V(uint32(106))}, |
| {V(uint32(107)), V(int64(107))}, |
| {V(int64(108)), V(uint32(108))}, |
| {V(uint32(109)), V(uint64(109))}, |
| {V(uint64(110)), V(uint32(110))}, |
| {V(uint32(111)), V(int(111))}, |
| {V(int(112)), V(uint32(112))}, |
| {V(uint32(113)), V(uint(113))}, |
| {V(uint(114)), V(uint32(114))}, |
| {V(uint32(115)), V(uintptr(115))}, |
| {V(uintptr(116)), V(uint32(116))}, |
| {V(uint32(117)), V(float32(117))}, |
| {V(float32(118)), V(uint32(118))}, |
| {V(uint32(119)), V(float64(119))}, |
| {V(float64(120)), V(uint32(120))}, |
| {V(int64(121)), V(int64(121))}, |
| {V(int64(122)), V(uint64(122))}, |
| {V(uint64(123)), V(int64(123))}, |
| {V(int64(124)), V(int(124))}, |
| {V(int(125)), V(int64(125))}, |
| {V(int64(126)), V(uint(126))}, |
| {V(uint(127)), V(int64(127))}, |
| {V(int64(128)), V(uintptr(128))}, |
| {V(uintptr(129)), V(int64(129))}, |
| {V(int64(130)), V(float32(130))}, |
| {V(float32(131)), V(int64(131))}, |
| {V(int64(132)), V(float64(132))}, |
| {V(float64(133)), V(int64(133))}, |
| {V(uint64(134)), V(uint64(134))}, |
| {V(uint64(135)), V(int(135))}, |
| {V(int(136)), V(uint64(136))}, |
| {V(uint64(137)), V(uint(137))}, |
| {V(uint(138)), V(uint64(138))}, |
| {V(uint64(139)), V(uintptr(139))}, |
| {V(uintptr(140)), V(uint64(140))}, |
| {V(uint64(141)), V(float32(141))}, |
| {V(float32(142)), V(uint64(142))}, |
| {V(uint64(143)), V(float64(143))}, |
| {V(float64(144)), V(uint64(144))}, |
| {V(int(145)), V(int(145))}, |
| {V(int(146)), V(uint(146))}, |
| {V(uint(147)), V(int(147))}, |
| {V(int(148)), V(uintptr(148))}, |
| {V(uintptr(149)), V(int(149))}, |
| {V(int(150)), V(float32(150))}, |
| {V(float32(151)), V(int(151))}, |
| {V(int(152)), V(float64(152))}, |
| {V(float64(153)), V(int(153))}, |
| {V(uint(154)), V(uint(154))}, |
| {V(uint(155)), V(uintptr(155))}, |
| {V(uintptr(156)), V(uint(156))}, |
| {V(uint(157)), V(float32(157))}, |
| {V(float32(158)), V(uint(158))}, |
| {V(uint(159)), V(float64(159))}, |
| {V(float64(160)), V(uint(160))}, |
| {V(uintptr(161)), V(uintptr(161))}, |
| {V(uintptr(162)), V(float32(162))}, |
| {V(float32(163)), V(uintptr(163))}, |
| {V(uintptr(164)), V(float64(164))}, |
| {V(float64(165)), V(uintptr(165))}, |
| {V(float32(166)), V(float32(166))}, |
| {V(float32(167)), V(float64(167))}, |
| {V(float64(168)), V(float32(168))}, |
| {V(float64(169)), V(float64(169))}, |
| |
| // truncation |
| {V(float64(1.5)), V(int(1))}, |
| |
| // complex |
| {V(complex64(1i)), V(complex64(1i))}, |
| {V(complex64(2i)), V(complex128(2i))}, |
| {V(complex128(3i)), V(complex64(3i))}, |
| {V(complex128(4i)), V(complex128(4i))}, |
| |
| // string |
| {V(string("hello")), V(string("hello"))}, |
| {V(string("bytes1")), V([]byte("bytes1"))}, |
| {V([]byte("bytes2")), V(string("bytes2"))}, |
| {V([]byte("bytes3")), V([]byte("bytes3"))}, |
| {V(string("runes♝")), V([]rune("runes♝"))}, |
| {V([]rune("runes♕")), V(string("runes♕"))}, |
| {V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))}, |
| {V(int('a')), V(string("a"))}, |
| {V(int8('a')), V(string("a"))}, |
| {V(int16('a')), V(string("a"))}, |
| {V(int32('a')), V(string("a"))}, |
| {V(int64('a')), V(string("a"))}, |
| {V(uint('a')), V(string("a"))}, |
| {V(uint8('a')), V(string("a"))}, |
| {V(uint16('a')), V(string("a"))}, |
| {V(uint32('a')), V(string("a"))}, |
| {V(uint64('a')), V(string("a"))}, |
| {V(uintptr('a')), V(string("a"))}, |
| {V(int(-1)), V(string("\uFFFD"))}, |
| {V(int8(-2)), V(string("\uFFFD"))}, |
| {V(int16(-3)), V(string("\uFFFD"))}, |
| {V(int32(-4)), V(string("\uFFFD"))}, |
| {V(int64(-5)), V(string("\uFFFD"))}, |
| {V(uint(0x110001)), V(string("\uFFFD"))}, |
| {V(uint32(0x110002)), V(string("\uFFFD"))}, |
| {V(uint64(0x110003)), V(string("\uFFFD"))}, |
| {V(uintptr(0x110004)), V(string("\uFFFD"))}, |
| |
| // named string |
| {V(MyString("hello")), V(string("hello"))}, |
| {V(string("hello")), V(MyString("hello"))}, |
| {V(string("hello")), V(string("hello"))}, |
| {V(MyString("hello")), V(MyString("hello"))}, |
| {V(MyString("bytes1")), V([]byte("bytes1"))}, |
| {V([]byte("bytes2")), V(MyString("bytes2"))}, |
| {V([]byte("bytes3")), V([]byte("bytes3"))}, |
| {V(MyString("runes♝")), V([]rune("runes♝"))}, |
| {V([]rune("runes♕")), V(MyString("runes♕"))}, |
| {V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))}, |
| {V([]rune("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))}, |
| {V(MyRunes("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))}, |
| {V(int('a')), V(MyString("a"))}, |
| {V(int8('a')), V(MyString("a"))}, |
| {V(int16('a')), V(MyString("a"))}, |
| {V(int32('a')), V(MyString("a"))}, |
| {V(int64('a')), V(MyString("a"))}, |
| {V(uint('a')), V(MyString("a"))}, |
| {V(uint8('a')), V(MyString("a"))}, |
| {V(uint16('a')), V(MyString("a"))}, |
| {V(uint32('a')), V(MyString("a"))}, |
| {V(uint64('a')), V(MyString("a"))}, |
| {V(uintptr('a')), V(MyString("a"))}, |
| {V(int(-1)), V(MyString("\uFFFD"))}, |
| {V(int8(-2)), V(MyString("\uFFFD"))}, |
| {V(int16(-3)), V(MyString("\uFFFD"))}, |
| {V(int32(-4)), V(MyString("\uFFFD"))}, |
| {V(int64(-5)), V(MyString("\uFFFD"))}, |
| {V(uint(0x110001)), V(MyString("\uFFFD"))}, |
| {V(uint32(0x110002)), V(MyString("\uFFFD"))}, |
| {V(uint64(0x110003)), V(MyString("\uFFFD"))}, |
| {V(uintptr(0x110004)), V(MyString("\uFFFD"))}, |
| |
| // named []byte |
| {V(string("bytes1")), V(MyBytes("bytes1"))}, |
| {V(MyBytes("bytes2")), V(string("bytes2"))}, |
| {V(MyBytes("bytes3")), V(MyBytes("bytes3"))}, |
| {V(MyString("bytes1")), V(MyBytes("bytes1"))}, |
| {V(MyBytes("bytes2")), V(MyString("bytes2"))}, |
| |
| // named []rune |
| {V(string("runes♝")), V(MyRunes("runes♝"))}, |
| {V(MyRunes("runes♕")), V(string("runes♕"))}, |
| {V(MyRunes("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))}, |
| {V(MyString("runes♝")), V(MyRunes("runes♝"))}, |
| {V(MyRunes("runes♕")), V(MyString("runes♕"))}, |
| |
| // named types and equal underlying types |
| {V(new(int)), V(new(integer))}, |
| {V(new(integer)), V(new(int))}, |
| {V(Empty{}), V(struct{}{})}, |
| {V(new(Empty)), V(new(struct{}))}, |
| {V(struct{}{}), V(Empty{})}, |
| {V(new(struct{})), V(new(Empty))}, |
| {V(Empty{}), V(Empty{})}, |
| {V(MyBytes{}), V([]byte{})}, |
| {V([]byte{}), V(MyBytes{})}, |
| {V((func())(nil)), V(MyFunc(nil))}, |
| {V((MyFunc)(nil)), V((func())(nil))}, |
| |
| // structs with different tags |
| {V(struct { |
| x int `some:"foo"` |
| }{}), V(struct { |
| x int `some:"bar"` |
| }{})}, |
| |
| {V(struct { |
| x int `some:"bar"` |
| }{}), V(struct { |
| x int `some:"foo"` |
| }{})}, |
| |
| {V(MyStruct{}), V(struct { |
| x int `some:"foo"` |
| }{})}, |
| |
| {V(struct { |
| x int `some:"foo"` |
| }{}), V(MyStruct{})}, |
| |
| {V(MyStruct{}), V(struct { |
| x int `some:"bar"` |
| }{})}, |
| |
| {V(struct { |
| x int `some:"bar"` |
| }{}), V(MyStruct{})}, |
| |
| // can convert *byte and *MyByte |
| {V((*byte)(nil)), V((*MyByte)(nil))}, |
| {V((*MyByte)(nil)), V((*byte)(nil))}, |
| |
| // cannot convert mismatched array sizes |
| {V([2]byte{}), V([2]byte{})}, |
| {V([3]byte{}), V([3]byte{})}, |
| |
| // cannot convert other instances |
| {V((**byte)(nil)), V((**byte)(nil))}, |
| {V((**MyByte)(nil)), V((**MyByte)(nil))}, |
| {V((chan byte)(nil)), V((chan byte)(nil))}, |
| {V((chan MyByte)(nil)), V((chan MyByte)(nil))}, |
| {V(([]byte)(nil)), V(([]byte)(nil))}, |
| {V(([]MyByte)(nil)), V(([]MyByte)(nil))}, |
| {V((map[int]byte)(nil)), V((map[int]byte)(nil))}, |
| {V((map[int]MyByte)(nil)), V((map[int]MyByte)(nil))}, |
| {V((map[byte]int)(nil)), V((map[byte]int)(nil))}, |
| {V((map[MyByte]int)(nil)), V((map[MyByte]int)(nil))}, |
| {V([2]byte{}), V([2]byte{})}, |
| {V([2]MyByte{}), V([2]MyByte{})}, |
| |
| // other |
| {V((***int)(nil)), V((***int)(nil))}, |
| {V((***byte)(nil)), V((***byte)(nil))}, |
| {V((***int32)(nil)), V((***int32)(nil))}, |
| {V((***int64)(nil)), V((***int64)(nil))}, |
| {V((chan byte)(nil)), V((chan byte)(nil))}, |
| {V((chan MyByte)(nil)), V((chan MyByte)(nil))}, |
| {V((map[int]bool)(nil)), V((map[int]bool)(nil))}, |
| {V((map[int]byte)(nil)), V((map[int]byte)(nil))}, |
| {V((map[uint]bool)(nil)), V((map[uint]bool)(nil))}, |
| {V([]uint(nil)), V([]uint(nil))}, |
| {V([]int(nil)), V([]int(nil))}, |
| {V(new(interface{})), V(new(interface{}))}, |
| {V(new(io.Reader)), V(new(io.Reader))}, |
| {V(new(io.Writer)), V(new(io.Writer))}, |
| |
| // channels |
| {V(IntChan(nil)), V((chan<- int)(nil))}, |
| {V(IntChan(nil)), V((<-chan int)(nil))}, |
| {V((chan int)(nil)), V(IntChanRecv(nil))}, |
| {V((chan int)(nil)), V(IntChanSend(nil))}, |
| {V(IntChanRecv(nil)), V((<-chan int)(nil))}, |
| {V((<-chan int)(nil)), V(IntChanRecv(nil))}, |
| {V(IntChanSend(nil)), V((chan<- int)(nil))}, |
| {V((chan<- int)(nil)), V(IntChanSend(nil))}, |
| {V(IntChan(nil)), V((chan int)(nil))}, |
| {V((chan int)(nil)), V(IntChan(nil))}, |
| {V((chan int)(nil)), V((<-chan int)(nil))}, |
| {V((chan int)(nil)), V((chan<- int)(nil))}, |
| {V(BytesChan(nil)), V((chan<- []byte)(nil))}, |
| {V(BytesChan(nil)), V((<-chan []byte)(nil))}, |
| {V((chan []byte)(nil)), V(BytesChanRecv(nil))}, |
| {V((chan []byte)(nil)), V(BytesChanSend(nil))}, |
| {V(BytesChanRecv(nil)), V((<-chan []byte)(nil))}, |
| {V((<-chan []byte)(nil)), V(BytesChanRecv(nil))}, |
| {V(BytesChanSend(nil)), V((chan<- []byte)(nil))}, |
| {V((chan<- []byte)(nil)), V(BytesChanSend(nil))}, |
| {V(BytesChan(nil)), V((chan []byte)(nil))}, |
| {V((chan []byte)(nil)), V(BytesChan(nil))}, |
| {V((chan []byte)(nil)), V((<-chan []byte)(nil))}, |
| {V((chan []byte)(nil)), V((chan<- []byte)(nil))}, |
| |
| // cannot convert other instances (channels) |
| {V(IntChan(nil)), V(IntChan(nil))}, |
| {V(IntChanRecv(nil)), V(IntChanRecv(nil))}, |
| {V(IntChanSend(nil)), V(IntChanSend(nil))}, |
| {V(BytesChan(nil)), V(BytesChan(nil))}, |
| {V(BytesChanRecv(nil)), V(BytesChanRecv(nil))}, |
| {V(BytesChanSend(nil)), V(BytesChanSend(nil))}, |
| |
| // interfaces |
| {V(int(1)), EmptyInterfaceV(int(1))}, |
| {V(string("hello")), EmptyInterfaceV(string("hello"))}, |
| {V(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))}, |
| {ReadWriterV(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))}, |
| {V(new(bytes.Buffer)), ReadWriterV(new(bytes.Buffer))}, |
| } |
| |
| func TestConvert(t *testing.T) { |
| canConvert := map[[2]Type]bool{} |
| all := map[Type]bool{} |
| |
| for _, tt := range convertTests { |
| t1 := tt.in.Type() |
| if !t1.ConvertibleTo(t1) { |
| t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t1) |
| continue |
| } |
| |
| t2 := tt.out.Type() |
| if !t1.ConvertibleTo(t2) { |
| t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t2) |
| continue |
| } |
| |
| all[t1] = true |
| all[t2] = true |
| canConvert[[2]Type{t1, t2}] = true |
| |
| // vout1 represents the in value converted to the in type. |
| v1 := tt.in |
| vout1 := v1.Convert(t1) |
| out1 := vout1.Interface() |
| if vout1.Type() != tt.in.Type() || !DeepEqual(out1, tt.in.Interface()) { |
| t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t1, out1, tt.in.Interface()) |
| } |
| |
| // vout2 represents the in value converted to the out type. |
| vout2 := v1.Convert(t2) |
| out2 := vout2.Interface() |
| if vout2.Type() != tt.out.Type() || !DeepEqual(out2, tt.out.Interface()) { |
| t.Errorf("ValueOf(%T(%[1]v)).Convert(%s) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out2, tt.out.Interface()) |
| } |
| |
| // vout3 represents a new value of the out type, set to vout2. This makes |
| // sure the converted value vout2 is really usable as a regular value. |
| vout3 := New(t2).Elem() |
| vout3.Set(vout2) |
| out3 := vout3.Interface() |
| if vout3.Type() != tt.out.Type() || !DeepEqual(out3, tt.out.Interface()) { |
| t.Errorf("Set(ValueOf(%T(%[1]v)).Convert(%s)) = %T(%[3]v), want %T(%[4]v)", tt.in.Interface(), t2, out3, tt.out.Interface()) |
| } |
| |
| if IsRO(v1) { |
| t.Errorf("table entry %v is RO, should not be", v1) |
| } |
| if IsRO(vout1) { |
| t.Errorf("self-conversion output %v is RO, should not be", vout1) |
| } |
| if IsRO(vout2) { |
| t.Errorf("conversion output %v is RO, should not be", vout2) |
| } |
| if IsRO(vout3) { |
| t.Errorf("set(conversion output) %v is RO, should not be", vout3) |
| } |
| if !IsRO(MakeRO(v1).Convert(t1)) { |
| t.Errorf("RO self-conversion output %v is not RO, should be", v1) |
| } |
| if !IsRO(MakeRO(v1).Convert(t2)) { |
| t.Errorf("RO conversion output %v is not RO, should be", v1) |
| } |
| } |
| |
| // Assume that of all the types we saw during the tests, |
| // if there wasn't an explicit entry for a conversion between |
| // a pair of types, then it's not to be allowed. This checks for |
| // things like 'int64' converting to '*int'. |
| for t1 := range all { |
| for t2 := range all { |
| expectOK := t1 == t2 || canConvert[[2]Type{t1, t2}] || t2.Kind() == Interface && t2.NumMethod() == 0 |
| if ok := t1.ConvertibleTo(t2); ok != expectOK { |
| t.Errorf("(%s).ConvertibleTo(%s) = %v, want %v", t1, t2, ok, expectOK) |
| } |
| } |
| } |
| } |
| |
| var gFloat32 float32 |
| |
| func TestConvertNaNs(t *testing.T) { |
| const snan uint32 = 0x7f800001 |
| type myFloat32 float32 |
| x := V(myFloat32(math.Float32frombits(snan))) |
| y := x.Convert(TypeOf(float32(0))) |
| z := y.Interface().(float32) |
| if got := math.Float32bits(z); got != snan { |
| t.Errorf("signaling nan conversion got %x, want %x", got, snan) |
| } |
| } |
| |
| type ComparableStruct struct { |
| X int |
| } |
| |
| type NonComparableStruct struct { |
| X int |
| Y map[string]int |
| } |
| |
| var comparableTests = []struct { |
| typ Type |
| ok bool |
| }{ |
| {TypeOf(1), true}, |
| {TypeOf("hello"), true}, |
| {TypeOf(new(byte)), true}, |
| {TypeOf((func())(nil)), false}, |
| {TypeOf([]byte{}), false}, |
| {TypeOf(map[string]int{}), false}, |
| {TypeOf(make(chan int)), true}, |
| {TypeOf(1.5), true}, |
| {TypeOf(false), true}, |
| {TypeOf(1i), true}, |
| {TypeOf(ComparableStruct{}), true}, |
| {TypeOf(NonComparableStruct{}), false}, |
| {TypeOf([10]map[string]int{}), false}, |
| {TypeOf([10]string{}), true}, |
| {TypeOf(new(interface{})).Elem(), true}, |
| } |
| |
| func TestComparable(t *testing.T) { |
| for _, tt := range comparableTests { |
| if ok := tt.typ.Comparable(); ok != tt.ok { |
| t.Errorf("TypeOf(%v).Comparable() = %v, want %v", tt.typ, ok, tt.ok) |
| } |
| } |
| } |
| |
| func TestOverflow(t *testing.T) { |
| if ovf := V(float64(0)).OverflowFloat(1e300); ovf { |
| t.Errorf("%v wrongly overflows float64", 1e300) |
| } |
| |
| maxFloat32 := float64((1<<24 - 1) << (127 - 23)) |
| if ovf := V(float32(0)).OverflowFloat(maxFloat32); ovf { |
| t.Errorf("%v wrongly overflows float32", maxFloat32) |
| } |
| ovfFloat32 := float64((1<<24-1)<<(127-23) + 1<<(127-52)) |
| if ovf := V(float32(0)).OverflowFloat(ovfFloat32); !ovf { |
| t.Errorf("%v should overflow float32", ovfFloat32) |
| } |
| if ovf := V(float32(0)).OverflowFloat(-ovfFloat32); !ovf { |
| t.Errorf("%v should overflow float32", -ovfFloat32) |
| } |
| |
| maxInt32 := int64(0x7fffffff) |
| if ovf := V(int32(0)).OverflowInt(maxInt32); ovf { |
| t.Errorf("%v wrongly overflows int32", maxInt32) |
| } |
| if ovf := V(int32(0)).OverflowInt(-1 << 31); ovf { |
| t.Errorf("%v wrongly overflows int32", -int64(1)<<31) |
| } |
| ovfInt32 := int64(1 << 31) |
| if ovf := V(int32(0)).OverflowInt(ovfInt32); !ovf { |
| t.Errorf("%v should overflow int32", ovfInt32) |
| } |
| |
| maxUint32 := uint64(0xffffffff) |
| if ovf := V(uint32(0)).OverflowUint(maxUint32); ovf { |
| t.Errorf("%v wrongly overflows uint32", maxUint32) |
| } |
| ovfUint32 := uint64(1 << 32) |
| if ovf := V(uint32(0)).OverflowUint(ovfUint32); !ovf { |
| t.Errorf("%v should overflow uint32", ovfUint32) |
| } |
| } |
| |
| func checkSameType(t *testing.T, x Type, y interface{}) { |
| if x != TypeOf(y) || TypeOf(Zero(x).Interface()) != TypeOf(y) { |
| t.Errorf("did not find preexisting type for %s (vs %s)", TypeOf(x), TypeOf(y)) |
| } |
| } |
| |
| func TestArrayOf(t *testing.T) { |
| // check construction and use of type not in binary |
| tests := []struct { |
| n int |
| value func(i int) interface{} |
| comparable bool |
| want string |
| }{ |
| { |
| n: 0, |
| value: func(i int) interface{} { type Tint int; return Tint(i) }, |
| comparable: true, |
| want: "[]", |
| }, |
| { |
| n: 10, |
| value: func(i int) interface{} { type Tint int; return Tint(i) }, |
| comparable: true, |
| want: "[0 1 2 3 4 5 6 7 8 9]", |
| }, |
| { |
| n: 10, |
| value: func(i int) interface{} { type Tfloat float64; return Tfloat(i) }, |
| comparable: true, |
| want: "[0 1 2 3 4 5 6 7 8 9]", |
| }, |
| { |
| n: 10, |
| value: func(i int) interface{} { type Tstring string; return Tstring(strconv.Itoa(i)) }, |
| comparable: true, |
| want: "[0 1 2 3 4 5 6 7 8 9]", |
| }, |
| { |
| n: 10, |
| value: func(i int) interface{} { type Tstruct struct{ V int }; return Tstruct{i} }, |
| comparable: true, |
| want: "[{0} {1} {2} {3} {4} {5} {6} {7} {8} {9}]", |
| }, |
| { |
| n: 10, |
| value: func(i int
|