Snap for 8383211 from f10932f763d058b0dcb3acfb795c869996fef47b to build-tools-release

Change-Id: I0969e0c20848f202469acc85c3681437b8b62fdc

1 files changed, 66 insertions, 0 deletions

diff --git a/go/callgraph/vta/testdata/src/panic.go b/go/callgraph/vta/testdata/src/panic.go
new file mode 100644
index 000000000..2d39c70ea
--- /dev/null
+++ b/go/callgraph/vta/testdata/src/panic.go
@@ -0,0 +1,66 @@
+// Copyright 2021 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.
+
+// go:build ignore
+
+package testdata
+
+type I interface {
+	foo()
+}
+
+type A struct{}
+
+func (a A) foo() {}
+
+func recover1() {
+	print("only this recover should execute")
+	if r, ok := recover().(I); ok {
+		r.foo()
+	}
+}
+
+func recover2() {
+	recover()
+}
+
+func Baz(a A) {
+	defer recover1()
+	panic(a)
+}
+
+// Relevant SSA:
+// func recover1():
+// 	0:
+//   t0 = print("only this recover...":string)
+//   t1 = recover()
+//   t2 = typeassert,ok t1.(I)
+//   t3 = extract t2 #0
+//   t4 = extract t2 #1
+//   if t4 goto 1 else 2
+//  1:
+//   t5 = invoke t3.foo()
+//   jump 2
+//  2:
+//   return
+//
+// func recover2():
+//   t0 = recover()
+//   return
+//
+// func Baz(i I):
+//   t0 = local A (a)
+//   *t0 = a
+//   defer recover1()
+//   t1 = *t0
+//   t2 = make interface{} <- A (t1)
+//   panic t2
+
+// t2 argument to panic in Baz gets ultimately connected to recover
+// registers t1 in recover1() and t0 in recover2().
+
+// WANT:
+// Panic -> Recover
+// Local(t2) -> Panic
+// Recover -> Local(t0), Local(t1)