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cc158403d6
In addition to reflect.Value.Call, exported methods can be invoked by the Func value in the reflect.Method struct. This CL has the compiler track what functions get access to a legitimate reflect.Method struct by looking for interface calls to either of: Method(int) reflect.Method MethodByName(string) (reflect.Method, bool) This is a little overly conservative. If a user implements a type with one of these methods without using the underlying calls on reflect.Type, the linker will assume the worst and include all exported methods. But it's cheap. No change to any of the binary sizes reported in cl/20483. For #14740 Change-Id: Ie17786395d0453ce0384d8b240ecb043b7726137 Reviewed-on: https://go-review.googlesource.com/20489 Reviewed-by: Matthew Dempsky <mdempsky@google.com>
37 lines
719 B
Go
37 lines
719 B
Go
// run
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// Copyright 2016 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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// The linker can prune methods that are not directly called or
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// assigned to interfaces, but only if reflect.Type.MethodByName is
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// never used. Test it here.
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package main
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import reflect1 "reflect"
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var called = false
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type M int
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func (m M) UniqueMethodName() {
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called = true
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}
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var v M
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type MyType interface {
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MethodByName(string) (reflect1.Method, bool)
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}
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func main() {
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var t MyType = reflect1.TypeOf(v)
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m, _ := t.MethodByName("UniqueMethodName")
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m.Func.Interface().(func(M))(v)
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if !called {
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panic("UniqueMethodName not called")
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}
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}
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