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-rw-r--r--test/fixedbugs/issue27695c.go65
1 files changed, 65 insertions, 0 deletions
diff --git a/test/fixedbugs/issue27695c.go b/test/fixedbugs/issue27695c.go
new file mode 100644
index 0000000..948191c
--- /dev/null
+++ b/test/fixedbugs/issue27695c.go
@@ -0,0 +1,65 @@
+// run
+
+// Copyright 2018 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.
+
+// Make sure return values aren't scanned until they
+// are initialized, when calling functions and methods
+// via reflect.
+
+package main
+
+import (
+ "io"
+ "reflect"
+ "runtime"
+ "unsafe"
+)
+
+var badPtr uintptr
+
+var sink []byte
+
+func init() {
+ // Allocate large enough to use largeAlloc.
+ b := make([]byte, 1<<16-1)
+ sink = b // force heap allocation
+ // Any space between the object and the end of page is invalid to point to.
+ badPtr = uintptr(unsafe.Pointer(&b[len(b)-1])) + 1
+}
+
+func f(d func(error) error) error {
+ // Initialize callee args section with a bad pointer.
+ g(badPtr, badPtr, badPtr, badPtr)
+
+ // Then call a function which returns a pointer.
+ // That return slot starts out holding a bad pointer.
+ return d(io.EOF)
+}
+
+//go:noinline
+func g(x, y, z, w uintptr) {
+}
+
+type T struct {
+}
+
+func (t *T) Foo(e error) error {
+ runtime.GC()
+ return e
+}
+
+func main() {
+ // Functions
+ d := reflect.MakeFunc(reflect.TypeOf(func(e error) error { return e }),
+ func(args []reflect.Value) []reflect.Value {
+ runtime.GC()
+ return args
+ }).Interface().(func(error) error)
+ f(d)
+
+ // Methods
+ x := reflect.ValueOf(&T{}).Method(0).Interface().(func(error) error)
+ f(x)
+}