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

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Merged
merged 4 commits into from
Jul 3, 2025
Merged

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

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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
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22 changes: 16 additions & 6 deletions lldb/packages/Python/lldbsuite/test/make/libcxx-simulators-common/compressed_pair.h
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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> {};
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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

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@frederick-vs-ja frederick-vs-ja Jun 18, 2025 •
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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; \
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