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@fitzgen fitzgen commented May 5, 2017

This makes generated generic structs lifetime invariant, since we cannot know
the C++ type's true variance.

Fixes #506

Rebased + squashed version of #635; cc @Kowasaki

To resolve the conflicts and rebase and squash, I did essentially these commands:

$ git fetch servo
$ git checkout -b Kowasaki-master servo/master
$ git merge --squash --edit Kowasaki/master
$ cargo test
$ cd tests/expectations
$ cargo test
$ cd -
$ git commit --author="Kowasaki"
$ git push fitzgen Kowasaki-master

Hopefully that is useful for you in the future :) Thanks for fixing this issue!

This makes generated generic structs lifetime invariant, since we cannot know
the C++ type's true variance.

Fixes rust-lang#506
@highfive
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highfive commented May 5, 2017

warning Warning warning

  • These commits modify unsafe code. Please review it carefully!

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fitzgen commented May 5, 2017

@bors-servo r+

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📌 Commit c779297 has been approved by fitzgen

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⌛ Testing commit c779297 with merge 3eb8f70...

bors-servo pushed a commit that referenced this pull request May 5, 2017
Emit `PhantomData<UnsafeCell<T>>` members for all generic parameters

This makes generated generic structs lifetime invariant, since we cannot know
the C++ type's true variance.

Fixes #506

Rebased + squashed version of #635; cc @Kowasaki

To resolve the conflicts and rebase and squash, I did essentially these commands:

```
$ git fetch servo
$ git checkout -b Kowasaki-master servo/master
$ git merge --squash --edit Kowasaki/master
$ cargo test
$ cd tests/expectations
$ cargo test
$ cd -
$ git commit --author="Kowasaki"
$ git push fitzgen Kowasaki-master
```

Hopefully that is useful for you in the future :) Thanks for fixing this issue!
@bors-servo
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☀️ Test successful - status-travis
Approved by: fitzgen
Pushing 3eb8f70 to master...

@bors-servo bors-servo merged commit c779297 into rust-lang:master May 5, 2017
@fitzgen fitzgen deleted the Kowasaki-master branch May 5, 2017 18:38
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Generate PhantomData<UnsafeCell<T>> to make generic FFI structs lifetime invariant

4 participants