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-rw-r--r--test/fixedbugs/issue46304.go76
1 files changed, 76 insertions, 0 deletions
diff --git a/test/fixedbugs/issue46304.go b/test/fixedbugs/issue46304.go
new file mode 100644
index 0000000..b8ecfc9
--- /dev/null
+++ b/test/fixedbugs/issue46304.go
@@ -0,0 +1,76 @@
+// run
+
+// 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.
+
+// This testcase caused a crash when the register ABI was in effect,
+// on amd64 (problem with register allocation).
+
+package main
+
+type Op struct {
+ tag string
+ _x []string
+ _q [20]uint64
+ plist []P
+}
+
+type P struct {
+ tag string
+ _x [10]uint64
+ b bool
+}
+
+type M int
+
+//go:noinline
+func (w *M) walkP(p *P) *P {
+ np := &P{}
+ *np = *p
+ np.tag += "new"
+ return np
+}
+
+func (w *M) walkOp(op *Op) *Op {
+ if op == nil {
+ return nil
+ }
+
+ orig := op
+ cloned := false
+ clone := func() {
+ if !cloned {
+ cloned = true
+ op = &Op{}
+ *op = *orig
+ }
+ }
+
+ pCloned := false
+ for i := range op.plist {
+ if s := w.walkP(&op.plist[i]); s != &op.plist[i] {
+ if !pCloned {
+ pCloned = true
+ clone()
+ op.plist = make([]P, len(orig.plist))
+ copy(op.plist, orig.plist)
+ }
+ op.plist[i] = *s
+ }
+ }
+
+ return op
+}
+
+func main() {
+ var ww M
+ w := &ww
+ p1 := P{tag: "a"}
+ p1._x[1] = 9
+ o := Op{tag: "old", plist: []P{p1}}
+ no := w.walkOp(&o)
+ if no.plist[0].tag != "anew" {
+ panic("bad")
+ }
+}