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cmd/cgo: erroneously allows methods declared on C types #39205

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mdempsky opened this issue May 21, 2020 · 1 comment
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cmd/cgo: erroneously allows methods declared on C types #39205

mdempsky opened this issue May 21, 2020 · 1 comment
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsDecision Feedback is required from experts, contributors, and/or the community before a change can be made.
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@mdempsky
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As reported at #35721 (comment), this code currently builds:

package p

import "C"

func (C.int) m() {}

This is because cmd/cgo rewrites C.int into _Ctype_int, which is a valid type to declare as a receiver parameter. However, this violates the abstraction of treating "C" as a separate package, as you can't normally declare methods on types imported from other packages.

Fixing this probably just amounts to having cmd/cgo reject C.foo identifiers within receiver parameter types, but this also risks breaking existing code that relies on this.

/cc @ianlancetaylor
@mdempsky mdempsky added the NeedsDecision Feedback is required from experts, contributors, and/or the community before a change can be made. label May 21, 2020
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Jul 13, 2022
@mknyszek mknyszek moved this to Triage Backlog in Go Compiler / Runtime Jul 15, 2022
@seankhliao seankhliao added this to the Unplanned milestone Aug 27, 2022
@mdempsky
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Duplicated as #57926. (Closing in favor of that issue, because it has more discussion.)

@github-project-automation github-project-automation bot moved this from Triage Backlog to Done in Go Compiler / Runtime Apr 26, 2023
@golang golang locked and limited conversation to collaborators Apr 25, 2024
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsDecision Feedback is required from experts, contributors, and/or the community before a change can be made.
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