Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/test/fixedbugs/issue15747.go b/test/fixedbugs/issue15747.go
new file mode 100644
index 0000000..7825958
--- /dev/null
+++ b/test/fixedbugs/issue15747.go
@@ -0,0 +1,45 @@
+// errorcheck -0 -live
+
+//go:build !goexperiment.cgocheck2
+// +build !goexperiment.cgocheck2
+
+// Copyright 2016 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 15747: liveness analysis was marking heap-escaped params live too much,
+// and worse was using the wrong bitmap bits to do so.
+
+package p
+
+var global *[]byte
+
+type Q struct{}
+
+type T struct{ M string }
+
+var b bool
+
+func f1(q *Q, xx []byte) interface{} { // ERROR "live at call to newobject: xx$" "live at entry to f1: xx$"
+	// xx was copied from the stack to the heap on the previous line:
+	// xx was live for the first two prints but then it switched to &xx
+	// being live. We should not see plain xx again.
+	if b {
+		global = &xx
+	}
+	xx, _, err := f2(xx, 5) // ERROR "live at call to f2: &xx$"
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+//go:noinline
+func f2(d []byte, n int) (odata, res []byte, e interface{}) { // ERROR "live at entry to f2: d$"
+	if n > len(d) {
+		return d, nil, &T{M: "hello"} // ERROR "live at call to newobject: d"
+	}
+	res = d[:n]
+	odata = d[n:]
+	return
+}