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1c77137d4f
A composite literal assignment
x = T{field: v}
may be compiled to
x = T{}
x.field = v
We already do not use this form is RHS uses LHS. If LHS is
address-taken, RHS may uses LHS implicitly, e.g.
v = &x.field
x = T{field: *v}
The lowering above would change the value of RHS (*v).
Fixes #52953.
Change-Id: I3f798e00598aaa550b8c17182c7472fef440d483
Reviewed-on: https://go-review.googlesource.com/c/go/+/407014
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
30 lines
488 B
Go
30 lines
488 B
Go
// run
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// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 52953: miscompilation for composite literal assignment
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// when LHS is address-taken.
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package main
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type T struct {
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Field1 bool
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}
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func main() {
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var ret T
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ret.Field1 = true
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var v *bool = &ret.Field1
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ret = T{Field1: *v}
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check(ret.Field1)
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}
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//go:noinline
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func check(b bool) {
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if !b {
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panic("FAIL")
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}
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}
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