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-rw-r--r--test/fixedbugs/issue26407.go58
1 files changed, 58 insertions, 0 deletions
diff --git a/test/fixedbugs/issue26407.go b/test/fixedbugs/issue26407.go
new file mode 100644
index 0000000..aa8e79c
--- /dev/null
+++ b/test/fixedbugs/issue26407.go
@@ -0,0 +1,58 @@
+// 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.
+
+// Issue 26407: ensure that stack variables which have
+// had their address taken and then used in a comparison,
+// but are otherwise unused, are cleared.
+
+package main
+
+func main() {
+ poison()
+ test()
+}
+
+//go:noinline
+func poison() {
+ // initialise the stack with invalid pointers
+ var large [256]uintptr
+ for i := range large {
+ large[i] = 1
+ }
+ use(large[:])
+}
+
+//go:noinline
+func test() {
+ a := 2
+ x := &a
+ if x != compare(&x) {
+ panic("not possible")
+ }
+}
+
+//go:noinline
+func compare(x **int) *int {
+ var y *int
+ if x == &y {
+ panic("not possible")
+ }
+ // grow the stack to trigger a check for invalid pointers
+ grow()
+ if x == &y {
+ panic("not possible")
+ }
+ return *x
+}
+
+//go:noinline
+func grow() {
+ var large [1 << 16]uintptr
+ use(large[:])
+}
+
+//go:noinline
+func use(_ []uintptr) { }