Skip to content

[lldb][test] Synchronize __compressed_pair_padding with libc++ #142516

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 4 commits into from
Jul 3, 2025
Merged

[lldb][test] Synchronize __compressed_pair_padding with libc++ #142516

Changes from 1 commit
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
3e8a4bf
[lldb][test] Synchronize `__compressed_pair_padding` with libc++
frederick-vs-ja Jun 3, 2025
a755d83
Bump `COMPRESSED_PAIR_REV`
frederick-vs-ja Jun 18, 2025
21f55cc
Merge branch 'main' into lldb-test-sync-compressed-pair
frederick-vs-ja Jun 18, 2025
6b8a63a
Restore one missed line
frederick-vs-ja Jun 18, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 16 additions & 6 deletions lldb/packages/Python/lldbsuite/test/make/libcxx-simulators-common/compressed_pair.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -72,14 +72,24 @@ inline const size_t __datasizeof_v =
template <class _Tp>
struct __lldb_is_final : public integral_constant<bool, __is_final(_Tp)> {};

template <class _ToPad> class __compressed_pair_padding {
char __padding_[((is_empty<_ToPad>::value &&
!__lldb_is_final<_ToPad>::value) ||
is_reference<_ToPad>::value)
? 0
: sizeof(_ToPad) - __datasizeof_v<_ToPad>];
template <class _ToPad>
inline const bool __is_reference_or_unpadded_object =
(std::is_empty<_ToPad>::value && !__lldb_is_final<_ToPad>::value) ||
sizeof(_ToPad) == __datasizeof_v<_ToPad>;

template <class _Tp>
inline const bool __is_reference_or_unpadded_object<_Tp &> = true;

template <class _Tp>
inline const bool __is_reference_or_unpadded_object<_Tp &&> = true;

template <class _ToPad, bool _Empty = __is_reference_or_unpadded_object<_ToPad>>
class __compressed_pair_padding {
char __padding_[sizeof(_ToPad) - __datasizeof_v<_ToPad>] = {};
};

template <class _ToPad> class __compressed_pair_padding<_ToPad, true> {};
Copy link
Member

@Michael137 Michael137 Jun 3, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks for keeping this in sync! What we would usually do with these simulators is to add the new implementation behind a ifdef COMPRESSED_PAIR_REV == <new version>. To make sure we don't regress users still on the older layout. Do you mind doing that? If it's too finicky I'm happy to give it a shot

Copy link
Contributor Author

@frederick-vs-ja frederick-vs-ja Jun 18, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Sorry for late replying. I'll do this soon I've done this, although this seems unnecessary as there doesn't seem any case where the layout will change.


#define _LLDB_COMPRESSED_PAIR(T1, Initializer1, T2, Initializer2) \
[[__gnu__::__aligned__( \
alignof(T2))]] _LLDB_NO_UNIQUE_ADDRESS T1 Initializer1; \
Expand Down
Loading