diff options
Diffstat (limited to 'misc/cgo/testplugin/testdata/issue18676')
3 files changed, 55 insertions, 0 deletions
diff --git a/misc/cgo/testplugin/testdata/issue18676/dynamodbstreamsevt/definition.go b/misc/cgo/testplugin/testdata/issue18676/dynamodbstreamsevt/definition.go new file mode 100644 index 0000000..70fd054 --- /dev/null +++ b/misc/cgo/testplugin/testdata/issue18676/dynamodbstreamsevt/definition.go @@ -0,0 +1,13 @@ +// Copyright 2017 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 dynamodbstreamsevt + +import "encoding/json" + +var foo json.RawMessage + +type Event struct{} + +func (e *Event) Dummy() {} diff --git a/misc/cgo/testplugin/testdata/issue18676/main.go b/misc/cgo/testplugin/testdata/issue18676/main.go new file mode 100644 index 0000000..b1dadbe --- /dev/null +++ b/misc/cgo/testplugin/testdata/issue18676/main.go @@ -0,0 +1,31 @@ +// Copyright 2017 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. + +// The bug happened like this: +// 1) The main binary adds an itab for *json.UnsupportedValueError / error +// (concrete type / interface type). This itab goes in hash bucket 0x111. +// 2) The plugin adds that same itab again. That makes a cycle in the itab +// chain rooted at hash bucket 0x111. +// 3) The main binary then asks for the itab for *dynamodbstreamsevt.Event / +// json.Unmarshaler. This itab happens to also live in bucket 0x111. +// The lookup code goes into an infinite loop searching for this itab. +// The code is carefully crafted so that the two itabs are both from the +// same bucket, and so that the second itab doesn't exist in +// the itab hashmap yet (so the entire linked list must be searched). +package main + +import ( + "encoding/json" + "plugin" + "testplugin/issue18676/dynamodbstreamsevt" +) + +func main() { + plugin.Open("plugin.so") + + var x interface{} = (*dynamodbstreamsevt.Event)(nil) + if _, ok := x.(json.Unmarshaler); !ok { + println("something") + } +} diff --git a/misc/cgo/testplugin/testdata/issue18676/plugin.go b/misc/cgo/testplugin/testdata/issue18676/plugin.go new file mode 100644 index 0000000..e7fc74f --- /dev/null +++ b/misc/cgo/testplugin/testdata/issue18676/plugin.go @@ -0,0 +1,11 @@ +// Copyright 2017 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 + +import "C" + +import "testplugin/issue18676/dynamodbstreamsevt" + +func F(evt *dynamodbstreamsevt.Event) {} |