From 86954d5246339231dc0c45f5547c37a1c3650264 Mon Sep 17 00:00:00 2001 From: Cherry Zhang Date: Fri, 13 Nov 2020 14:42:45 -0500 Subject: cmd/compile: mark plugin-exported types as used in interface Plugin exports symbols as interfaces. Mark their types as used in interfaces, so their methods will be kept alive by the linker. Fixes #42579. Change-Id: If1b5aacc21510c20c25f88bb131bca61db6f1d56 Reviewed-on: https://go-review.googlesource.com/c/go/+/269819 Trust: Cherry Zhang Reviewed-by: Than McIntosh --- misc/cgo/testplugin/testdata/method/main.go | 26 ++++++++++++++++++++++++++ misc/cgo/testplugin/testdata/method/plugin.go | 13 +++++++++++++ 2 files changed, 39 insertions(+) create mode 100644 misc/cgo/testplugin/testdata/method/main.go create mode 100644 misc/cgo/testplugin/testdata/method/plugin.go (limited to 'misc/cgo/testplugin/testdata') diff --git a/misc/cgo/testplugin/testdata/method/main.go b/misc/cgo/testplugin/testdata/method/main.go new file mode 100644 index 0000000000..5e9189b450 --- /dev/null +++ b/misc/cgo/testplugin/testdata/method/main.go @@ -0,0 +1,26 @@ +// Copyright 2020 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. + +// Issue 42579: methods of symbols exported from plugin must be live. + +package main + +import ( + "plugin" + "reflect" +) + +func main() { + p, err := plugin.Open("plugin.so") + if err != nil { + panic(err) + } + + x, err := p.Lookup("X") + if err != nil { + panic(err) + } + + reflect.ValueOf(x).Elem().MethodByName("M").Call(nil) +} diff --git a/misc/cgo/testplugin/testdata/method/plugin.go b/misc/cgo/testplugin/testdata/method/plugin.go new file mode 100644 index 0000000000..240edd3bc4 --- /dev/null +++ b/misc/cgo/testplugin/testdata/method/plugin.go @@ -0,0 +1,13 @@ +// Copyright 2020 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. + +package main + +func main() {} + +type T int + +func (T) M() { println("M") } + +var X T -- cgit v1.3