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Diffstat (limited to 'src/pkg/reflect/all_test.go')
-rw-r--r-- | src/pkg/reflect/all_test.go | 1564 |
1 files changed, 1564 insertions, 0 deletions
diff --git a/src/pkg/reflect/all_test.go b/src/pkg/reflect/all_test.go new file mode 100644 index 000000000..257278e8f --- /dev/null +++ b/src/pkg/reflect/all_test.go @@ -0,0 +1,1564 @@ +// 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" + "container/vector" + "fmt" + "io" + "os" + . "reflect" + "runtime" + "testing" + "unsafe" +) + +type integer int +type T struct { + a int + b float64 + c string + d *int +} + +type pair struct { + i interface{} + s string +} + +func isDigit(c uint8) bool { return '0' <= c && c <= '9' } + +func assert(t *testing.T, s, want string) { + if s != want { + t.Errorf("have %#q want %#q", s, want) + } +} + +func typestring(i interface{}) string { return TypeOf(i).String() } + +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 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() }", + }, +} + +var valueTests = []pair{ + {new(int8), "8"}, + {new(int16), "16"}, + {new(int32), "32"}, + {new(int64), "64"}, + {new(uint8), "8"}, + {new(uint16), "16"}, + {new(uint32), "32"}, + {new(uint64), "64"}, + {new(float32), "256.25"}, + {new(float64), "512.125"}, + {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).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) + } + } +} + +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 v.Interface() != v.Interface() || v.Interface() != x { + t.Fatalf("TestFunction != itself") + } + 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 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 +} + +var deepEqualTests = []DeepEqualTest{ + // Equalities + {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}, + {os.Error(nil), os.Error(nil), true}, + {map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, 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}, + + // 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}, +} + +func TestDeepEqual(t *testing.T) { + for _, test := range deepEqualTests { + 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) { + 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 }{}, + } + 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 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() + i := 0 + 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, + // but they are in this implementation, which makes + // the test easier. + if i >= len(keys) { + t.Errorf("Missing key #%d %q", i, k) + } else if kv := keys[i]; kv.String() != k { + t.Errorf("Keys[%q] = %d, want %d", i, kv.Int(), k) + } + i++ + + // 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", newm, 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 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") + } 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)) + } + +} + +// Difficult test for function call because of +// implicit padding between arguments. +func dummy(b byte, c int, d byte) (i byte, j int, k byte) { + return b, c, d +} + +func TestFunc(t *testing.T) { + ret := ValueOf(dummy).Call([]Value{ValueOf(byte(10)), ValueOf(20), ValueOf(byte(30))}) + if len(ret) != 3 { + t.Fatalf("Call returned %d values, want 3", len(ret)) + } + + i := byte(ret[0].Uint()) + j := int(ret[1].Int()) + k := byte(ret[2].Uint()) + if i != 10 || j != 20 || k != 30 { + t.Errorf("Call returned %d, %d, %d; want 10, 20, 30", i, j, k) + } +} + +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 +} + +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") + } + m.Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Type MethodByName returned %d; want 250", i) + } + + i = TypeOf(&p).Method(1).Func.Call([]Value{ValueOf(&p), ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Pointer Type Method returned %d; want 250", i) + } + + m, ok = TypeOf(&p).MethodByName("Dist") + if !ok { + t.Fatalf("ptr method by name failed") + } + i = m.Func.Call([]Value{ValueOf(&p), ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Pointer Type MethodByName returned %d; want 250", i) + } + + // Curried method of value. + i = ValueOf(p).Method(1).Call([]Value{ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Value Method returned %d; want 250", i) + } + i = ValueOf(p).MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Value MethodByName returned %d; want 250", i) + } + + // Curried method of pointer. + i = ValueOf(&p).Method(1).Call([]Value{ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Pointer Value Method returned %d; want 250", i) + } + i = ValueOf(&p).MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Pointer Value MethodByName returned %d; want 250", 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) + i = pv.Method(0).Call([]Value{ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Interface Method returned %d; want 250", i) + } + i = pv.MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int() + if i != 250 { + t.Errorf("Interface MethodByName returned %d; want 250", i) + } +} + +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.Error("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 +} + +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}, +} + +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", s.Name(), test.name, len(f.Index), len(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) { + if path := TypeOf(vector.Vector{}).PkgPath(); path != "container/vector" { + t.Errorf("TypeOf(vector.Vector{}).PkgPath() = %q, want \"container/vector\"", path) + } +} + +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 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) + } +} + +func TestPtrTo(t *testing.T) { + var i int + + typ := TypeOf(i) + for i = 0; i < 100; i++ { + typ = PtrTo(typ) + } + for i = 0; i < 100; i++ { + typ = typ.Elem() + } + if typ != TypeOf(i) { + t.Errorf("after 100 PtrTo and Elem, have %s, want %s", typ, TypeOf(i)) + } +} + +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") + } +} + +func noAlloc(t *testing.T, n int, f func(int)) { + // once to prime everything + f(-1) + runtime.MemStats.Mallocs = 0 + + for j := 0; j < n; j++ { + f(j) + } + // A few allocs may happen in the testing package when GOMAXPROCS > 1, so don't + // require zero mallocs. + if runtime.MemStats.Mallocs > 5 { + t.Fatalf("%d mallocs after %d iterations", runtime.MemStats.Mallocs, n) + } +} + +func TestAllocations(t *testing.T) { + noAlloc(t, 100, func(j int) { + var i interface{} + var v Value + i = 42 + j + v = ValueOf(i) + if int(v.Int()) != 42+j { + panic("wrong int") + } + }) +} + +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 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 || v[0] != 4 || v[1] != 5 { + t.Errorf("xs.Slice(3, 5) = %v", v) + } + + xa := [7]int{10, 20, 30, 40, 50, 60, 70} + v = ValueOf(&xa).Elem().Slice(2, 5).Interface().([]int) + if len(v) != 3 || v[0] != 30 || v[1] != 40 || v[2] != 50 { + t.Errorf("xa.Slice(2, 5) = %v", v) + } +} + +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") + } +} + +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)`}, +} + +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) + } + } +} |