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cmd/compile: miscompilation in pointer operations [1.17 backport] #52960

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gopherbot opened this issue May 18, 2022 · 3 comments
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cmd/compile: miscompilation in pointer operations [1.17 backport] #52960

gopherbot opened this issue May 18, 2022 · 3 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
Milestone
Go1.17.13

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@gopherbot
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@bcmills requested issue #52953 to be considered for backport to the next 1.17 minor release.

@gopherbot, please backport to Go 1.17 and 1.18. This bug causes miscompilation of otherwise-correct Go programs.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label May 18, 2022
@gopherbot gopherbot mentioned this issue May 18, 2022
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@gopherbot gopherbot added this to the Go1.17.11 milestone May 18, 2022
@randall77
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See my comment on #52961

@dmitshur dmitshur modified the milestones: Go1.17.11, Go1.17.12 Jun 1, 2022
@heschi heschi added the CherryPickApproved Used during the release process for point releases label Jun 15, 2022
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Jun 15, 2022
@gopherbot gopherbot modified the milestones: Go1.17.12, Go1.17.13 Jul 12, 2022
@knz knz mentioned this issue Jul 18, 2022
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@gopherbot
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Change https://go.dev/cl/419451 mentions this issue: [release-branch.go1.17] cmd/compile: do not use special literal assignment if LHS is address-taken

@gopherbot
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Closed by merging d9242f7 to release-branch.go1.17.

gopherbot pushed a commit that referenced this issue Jul 26, 2022
@cherrymui
[release-branch.go1.17] cmd/compile: do not use special literal assig…
d9242f7 
…nment if LHS is address-taken

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).

Updates #52953.
Fixes #52960.

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>
(cherry picked from commit 1c77137)
Reviewed-on: https://go-review.googlesource.com/c/go/+/419451
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
@golang golang locked and limited conversation to collaborators Jul 26, 2023
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