diff options
author | Keith Randall <khr@golang.org> | 2023-12-20 15:38:50 -0800 |
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committer | Keith Randall <khr@golang.org> | 2023-12-21 00:15:58 +0000 |
commit | f6509cf5cdbb5787061b784973782933c47f1782 (patch) | |
tree | ccfccc1031dbd0e0be172e1ea7303e827531742d /test | |
parent | adec22b9f7c9d9cfb95ff6af1c63ec489d6e9bb8 (diff) | |
download | go-f6509cf5cdbb5787061b784973782933c47f1782.tar.gz go-f6509cf5cdbb5787061b784973782933c47f1782.zip |
cmd/compile: handle constant-folding of an out-of-range jump table index
The input index to a jump table can be out of range for unreachable code.
Dynamically the compiler ensures that an out-of-range index can never
reach a jump table, but that guarantee doesn't extend to the static
realm.
Fixes #64826
Change-Id: I5829f3933ae5124ffad8337dfd7dd75e67a8ec33
Reviewed-on: https://go-review.googlesource.com/c/go/+/552055
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Diffstat (limited to 'test')
-rw-r--r-- | test/fixedbugs/issue64826.go | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/fixedbugs/issue64826.go b/test/fixedbugs/issue64826.go new file mode 100644 index 0000000000..864c474a64 --- /dev/null +++ b/test/fixedbugs/issue64826.go @@ -0,0 +1,38 @@ +// build + +// Copyright 2023 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. + +package main + +func main() { + f(g(false)) +} +func g(b bool) string { + if b { + return "z" + } + return "q" +} +func f(x string) int { + switch len(x) { + case 4: + return 4 + case 5: + return 5 + case 6: + return 6 + case 7: + return 7 + case 8: + return 8 + case 9: + return 9 + case 10: + return 10 + case 11: + return 11 + } + return 0 +} |