diff options
author | Cuong Manh Le <cuong.manhle.vn@gmail.com> | 2021-06-13 22:28:44 +0700 |
---|---|---|
committer | Cuong Manh Le <cuong.manhle.vn@gmail.com> | 2021-06-14 07:12:37 +0000 |
commit | 326ea438bb579a2010e38e00f515a04344ff96b0 (patch) | |
tree | da29b2c3285e8299cc3936b2ec5691edea006bcf /test/fixedbugs | |
parent | 3249b645c986849bbf72c1dc71efc4f90df465ec (diff) | |
download | go-326ea438bb579a2010e38e00f515a04344ff96b0.tar.gz go-326ea438bb579a2010e38e00f515a04344ff96b0.zip |
cmd/compile: rewrite a, b = f() to use temporaries when type not identical
If any of the LHS expressions of an OAS2FUNC are not identical to the
respective function call results, escape analysis mishandles the
implicit conversion, causes memory corruption.
Instead, we should insert autotmps like we already do for f(g()) calls
and return g() statements.
Fixes #46725
Change-Id: I71a08da0bf1a03d09a023da5b6f78fb37a4a4690
Reviewed-on: https://go-review.googlesource.com/c/go/+/327651
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Diffstat (limited to 'test/fixedbugs')
-rw-r--r-- | test/fixedbugs/issue46725.go | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/test/fixedbugs/issue46725.go b/test/fixedbugs/issue46725.go new file mode 100644 index 0000000000..29799c7d7e --- /dev/null +++ b/test/fixedbugs/issue46725.go @@ -0,0 +1,48 @@ +// 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. + +package main + +import "runtime" + +type T [4]int + +//go:noinline +func g(x []*T) ([]*T, []*T) { return x, x } + +func main() { + const Jenny = 8675309 + s := [10]*T{{Jenny}} + + done := make(chan struct{}) + runtime.SetFinalizer(s[0], func(p *T) { close(done) }) + + var h, _ interface{} = g(s[:]) + + if wait(done) { + panic("GC'd early") + } + + if h.([]*T)[0][0] != Jenny { + panic("lost Jenny's number") + } + + if !wait(done) { + panic("never GC'd") + } +} + +func wait(done <-chan struct{}) bool { + for i := 0; i < 10; i++ { + runtime.GC() + select { + case <-done: + return true + default: + } + } + return false +} |