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| 1 | +// Copyright 2021 The Go Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by a BSD-style |
| 3 | +// license that can be found in the LICENSE file. |
| 4 | + |
| 5 | +package types_test |
| 6 | + |
| 7 | +import ( |
| 8 | + "testing" |
| 9 | + |
| 10 | + "go/internal/typeparams" |
| 11 | + . "go/types" |
| 12 | +) |
| 13 | + |
| 14 | +func TestNewMethodSet(t *testing.T) { |
| 15 | + type method struct { |
| 16 | + name string |
| 17 | + index []int |
| 18 | + indirect bool |
| 19 | + } |
| 20 | + |
| 21 | + // Tests are expressed src -> methods, for simplifying the composite literal. |
| 22 | + // Should be kept in sync with TestLookupFieldOrMethod. |
| 23 | + tests := map[string][]method{ |
| 24 | + // Named types |
| 25 | + "var a T; type T struct{}; func (T) f() {}": {{"f", []int{0}, false}}, |
| 26 | + "var a *T; type T struct{}; func (T) f() {}": {{"f", []int{0}, true}}, |
| 27 | + "var a T; type T struct{}; func (*T) f() {}": {}, |
| 28 | + "var a *T; type T struct{}; func (*T) f() {}": {{"f", []int{0}, true}}, |
| 29 | + |
| 30 | + // Interfaces |
| 31 | + "var a T; type T interface{ f() }": {{"f", []int{0}, true}}, |
| 32 | + "var a T1; type ( T1 T2; T2 interface{ f() } )": {{"f", []int{0}, true}}, |
| 33 | + "var a T1; type ( T1 interface{ T2 }; T2 interface{ f() } )": {{"f", []int{0}, true}}, |
| 34 | + |
| 35 | + // Embedding |
| 36 | + "var a struct{ E }; type E interface{ f() }": {{"f", []int{0, 0}, true}}, |
| 37 | + "var a *struct{ E }; type E interface{ f() }": {{"f", []int{0, 0}, true}}, |
| 38 | + "var a struct{ E }; type E struct{}; func (E) f() {}": {{"f", []int{0, 0}, false}}, |
| 39 | + "var a struct{ *E }; type E struct{}; func (E) f() {}": {{"f", []int{0, 0}, true}}, |
| 40 | + "var a struct{ E }; type E struct{}; func (*E) f() {}": {}, |
| 41 | + "var a struct{ *E }; type E struct{}; func (*E) f() {}": {{"f", []int{0, 0}, true}}, |
| 42 | + |
| 43 | + // collisions |
| 44 | + "var a struct{ E1; *E2 }; type ( E1 interface{ f() }; E2 struct{ f int })": {}, |
| 45 | + "var a struct{ E1; *E2 }; type ( E1 struct{ f int }; E2 struct{} ); func (E2) f() {}": {}, |
| 46 | + } |
| 47 | + |
| 48 | + genericTests := map[string][]method{ |
| 49 | + // By convention, look up a in the scope of "g" |
| 50 | + "type C interface{ f() }; func g[T C](a T){}": {{"f", []int{0}, true}}, |
| 51 | + "type C interface{ f() }; func g[T C]() { var a T; _ = a }": {{"f", []int{0}, true}}, |
| 52 | + "type C interface{ f() }; func g[T C]() { var a struct{T}; _ = a }": {{"f", []int{0, 0}, true}}, |
| 53 | + |
| 54 | + // Issue #45639. |
| 55 | + "type C interface{ f() }; func g[T C]() { type Y T; var a Y; _ = a }": {}, |
| 56 | + } |
| 57 | + |
| 58 | + check := func(src string, methods []method, generic bool) { |
| 59 | + pkgName := "p" |
| 60 | + if generic { |
| 61 | + // The generic_ prefix causes pkgFor to allow generic code. |
| 62 | + pkgName = "generic_p" |
| 63 | + } |
| 64 | + pkg, err := pkgFor("test", "package "+pkgName+";"+src, nil) |
| 65 | + if err != nil { |
| 66 | + t.Errorf("%s: incorrect test case: %s", src, err) |
| 67 | + return |
| 68 | + } |
| 69 | + |
| 70 | + scope := pkg.Scope() |
| 71 | + if generic { |
| 72 | + fn := pkg.Scope().Lookup("g").(*Func) |
| 73 | + scope = fn.Scope() |
| 74 | + } |
| 75 | + obj := scope.Lookup("a") |
| 76 | + if obj == nil { |
| 77 | + t.Errorf("%s: incorrect test case - no object a", src) |
| 78 | + return |
| 79 | + } |
| 80 | + |
| 81 | + ms := NewMethodSet(obj.Type()) |
| 82 | + if got, want := ms.Len(), len(methods); got != want { |
| 83 | + t.Errorf("%s: got %d methods, want %d", src, got, want) |
| 84 | + return |
| 85 | + } |
| 86 | + for i, m := range methods { |
| 87 | + sel := ms.At(i) |
| 88 | + if got, want := sel.Obj().Name(), m.name; got != want { |
| 89 | + t.Errorf("%s [method %d]: got name = %q at, want %q", src, i, got, want) |
| 90 | + } |
| 91 | + if got, want := sel.Index(), m.index; !sameSlice(got, want) { |
| 92 | + t.Errorf("%s [method %d]: got index = %v, want %v", src, i, got, want) |
| 93 | + } |
| 94 | + if got, want := sel.Indirect(), m.indirect; got != want { |
| 95 | + t.Errorf("%s [method %d]: got indirect = %v, want %v", src, i, got, want) |
| 96 | + } |
| 97 | + } |
| 98 | + } |
| 99 | + |
| 100 | + for src, methods := range tests { |
| 101 | + check(src, methods, false) |
| 102 | + } |
| 103 | + |
| 104 | + if typeparams.Enabled { |
| 105 | + for src, methods := range genericTests { |
| 106 | + check(src, methods, true) |
| 107 | + } |
| 108 | + } |
| 109 | +} |
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