| 1 | // Copyright 2022 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 ssa |
| 6 | |
| 7 | import ( |
| 8 | "go/ast" |
| 9 | "go/parser" |
| 10 | "go/token" |
| 11 | "go/types" |
| 12 | "testing" |
| 13 | |
| 14 | "golang.org/x/tools/internal/typeparams" |
| 15 | ) |
| 16 | |
| 17 | func TestIsParameterized(t *testing.T) { |
| 18 | if !typeparams.Enabled { |
| 19 | return |
| 20 | } |
| 21 | |
| 22 | const source = ` |
| 23 | package P |
| 24 | type A int |
| 25 | func (A) f() |
| 26 | func (*A) g() |
| 27 | |
| 28 | type fer interface { f() } |
| 29 | |
| 30 | func Apply[T fer](x T) T { |
| 31 | x.f() |
| 32 | return x |
| 33 | } |
| 34 | |
| 35 | type V[T any] []T |
| 36 | func (v *V[T]) Push(x T) { *v = append(*v, x) } |
| 37 | ` |
| 38 | |
| 39 | fset := token.NewFileSet() |
| 40 | f, err := parser.ParseFile(fset, "hello.go", source, 0) |
| 41 | if err != nil { |
| 42 | t.Fatal(err) |
| 43 | } |
| 44 | |
| 45 | var conf types.Config |
| 46 | pkg, err := conf.Check("P", fset, []*ast.File{f}, nil) |
| 47 | if err != nil { |
| 48 | t.Fatal(err) |
| 49 | } |
| 50 | |
| 51 | for _, test := range []struct { |
| 52 | expr string // type expression |
| 53 | want bool // expected isParameterized value |
| 54 | }{ |
| 55 | {"A", false}, |
| 56 | {"*A", false}, |
| 57 | {"error", false}, |
| 58 | {"*error", false}, |
| 59 | {"struct{A}", false}, |
| 60 | {"*struct{A}", false}, |
| 61 | {"fer", false}, |
| 62 | {"Apply", true}, |
| 63 | {"Apply[A]", false}, |
| 64 | {"V", true}, |
| 65 | {"V[A]", false}, |
| 66 | {"*V[A]", false}, |
| 67 | {"(*V[A]).Push", false}, |
| 68 | } { |
| 69 | tv, err := types.Eval(fset, pkg, 0, test.expr) |
| 70 | if err != nil { |
| 71 | t.Errorf("Eval(%s) failed: %v", test.expr, err) |
| 72 | } |
| 73 | |
| 74 | param := tpWalker{seen: make(map[types.Type]bool)} |
| 75 | if got := param.isParameterized(tv.Type); got != test.want { |
| 76 | t.Logf("Eval(%s) returned the type %s", test.expr, tv.Type) |
| 77 | t.Errorf("isParameterized(%s) = %v, want %v", test.expr, got, test.want) |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 |
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