mirror of
https://github.com/golang/go
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63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
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// run
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Make sure return values are always scanned, when
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// calling methods (+functions, TODO) with reflect.
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package main
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import (
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"reflect"
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"runtime/debug"
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"sync"
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)
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func main() {
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debug.SetGCPercent(1) // run GC frequently
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var wg sync.WaitGroup
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for i := 0; i < 20; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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for i := 0; i < 2000; i++ {
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_test()
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}
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}()
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}
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wg.Wait()
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}
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type Stt struct {
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Data interface{}
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}
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type My struct {
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b byte
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}
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func (this *My) Run(rawData []byte) (Stt, error) {
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var data string = "hello"
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stt := Stt{
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Data: data,
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}
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return stt, nil
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}
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func _test() (interface{}, error) {
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f := reflect.ValueOf(&My{}).MethodByName("Run")
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if method, ok := f.Interface().(func([]byte) (Stt, error)); ok {
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s, e := method(nil)
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// The bug in issue27695 happens here, during the return
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// from the above call (at the end of reflect.callMethod
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// when preparing to return). The result value that
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// is assigned to s was not being scanned if GC happens
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// to occur there.
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i := interface{}(s)
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return i, e
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}
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return nil, nil
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}
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