| // Copyright 2023 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. |
| |
| // Methods of reflect.rtype use StructOf and FuncOf which in turn depend on |
| // reflect.Value.Method. StructOf and FuncOf must not disable the DCE. |
| |
| package main |
| |
| import "reflect" |
| |
| type S int |
| |
| func (s S) M() { println("S.M") } |
| |
| func (s S) N() { println("S.N") } |
| |
| type T float64 |
| |
| func (t T) F(s S) {} |
| |
| func useStructOf() { |
| t := reflect.StructOf([]reflect.StructField{ |
| { |
| Name: "X", |
| Type: reflect.TypeOf(int(0)), |
| }, |
| }) |
| println(t.Name()) |
| } |
| |
| func useFuncOf() { |
| t := reflect.FuncOf( |
| []reflect.Type{reflect.TypeOf(int(0))}, |
| []reflect.Type{reflect.TypeOf(int(0))}, |
| false, |
| ) |
| println(t.Name()) |
| } |
| |
| func main() { |
| useStructOf() |
| useFuncOf() |
| |
| var t T |
| meth, _ := reflect.TypeOf(t).MethodByName("F") |
| ft := meth.Type |
| at := ft.In(1) |
| v := reflect.New(at).Elem() |
| methV := v.MethodByName("M") |
| methV.Call([]reflect.Value{v}) |
| } |