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cmd/cgo: exported cgo types not marked as go:notinheap #41761

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randall77 opened this issue Oct 2, 2020 · 7 comments
Closed

cmd/cgo: exported cgo types not marked as go:notinheap #41761

randall77 opened this issue Oct 2, 2020 · 7 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.16

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@randall77
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a.go:

package a

/*
   typedef struct S S;
*/
import "C"

type T struct {
	X *C.S
}

b.go:

package main

/*
   typedef struct S S;
*/
import "C"

import "a"

func main() {
	var x a.T
	_ = (*C.struct_S)(x.X)
}

When trying to build b, we get the error:

./b.go:12:19: cannot convert x.X (type *a._Ctype_struct_S) to type *_Ctype_struct_S:
	_Ctype_struct_S is incomplete (or unallocatable), but a._Ctype_struct_S is not

I think a._Ctype_struct_S should be incomplete as well.

@ianlancetaylor @neild
@randall77
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I believe the problem is just that the notinheap annotation does not survive exporting into an object file and importing back. Should be easy to fix.

@randall77
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@gopherbot please open a backport to 1.15.

@gopherbot
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Change https://golang.org/cl/259297 mentions this issue: cmd/compile: export notinheap annotation to object file

@gopherbot
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Backport issue(s) opened: #41766 (for 1.15).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://golang.org/wiki/MinorReleases.

@gopherbot gopherbot mentioned this issue Oct 2, 2020
Closed
@dmitshur dmitshur added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 6, 2020
@dmitshur dmitshur modified the milestones: Backlog, Go1.16 Oct 6, 2020
@gopherbot
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Change https://golang.org/cl/265258 mentions this issue: compiler, go/internal/gccgoimporter: export notinheap annotation

@tinyzimmer tinyzimmer mentioned this issue Oct 27, 2020
Open
gopherbot pushed a commit to golang/gofrontend that referenced this issue Oct 27, 2020
@ianlancetaylor
compiler, go/internal/gccgoimporter: export notinheap annotation
957591b 
This is the gofrontend version of https://golang.org/cl/259297.
This is required now because that change is in the 1.15.3 release.

This requires changing the go/internal/gccgoimporter package, to skip
the new annotation. This change will need to be ported to the gc and
x/tools repos.

For golang/go#41761

Change-Id: I81d63db7e7c41d168dfa5f1539c063c1c2413568
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/265258
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
@gopherbot
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Change https://golang.org/cl/265702 mentions this issue: go/internal/gccgoimporter: support notinheap annotation

gopherbot pushed a commit that referenced this issue Oct 27, 2020
@ianlancetaylor
go/internal/gccgoimporter: support notinheap annotation
9fcb5e0 
The gofrontend has started emitting a notinheap annotation for types
marked go:notinheap.

For #41761

Change-Id: Ic8f7ffc32dbfe98ec09b3d835957f1be8e6c1208
Reviewed-on: https://go-review.googlesource.com/c/go/+/265702
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
@gopherbot
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Change https://golang.org/cl/265718 mentions this issue: go/internal/gccgoimporter: support notinheap annotation

gopherbot pushed a commit to golang/tools that referenced this issue Oct 27, 2020
@ianlancetaylor
go/internal/gccgoimporter: support notinheap annotation
6312208 
Port https://golang.org/cl/265702 from the main Go repo.

Original CL description:
    The gofrontend has started emitting a notinheap annotation for types
    marked go:notinheap.

For golang/go#41761

Change-Id: Ic14ffda4b0c3eef850ad85dbf9af755283a5196b
Reviewed-on: https://go-review.googlesource.com/c/tools/+/265718
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
@golang golang locked and limited conversation to collaborators Oct 27, 2021
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.16
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@dmitshur @randall77 @gopherbot