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Prepare libcxx and libcxxabi for pointer field protection. #151651

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Prepare libcxx and libcxxabi for pointer field protection. #151651

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23 changes: 22 additions & 1 deletion libcxx/include/__config
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Original file line number Diff line number Diff line change
Expand Up @@ -484,8 +484,21 @@ typedef __char32_t char32_t;
# define _LIBCPP_EXCEPTIONS_SIG e
# endif

# if !_LIBCPP_HAS_EXCEPTIONS
# define _LIBCPP_EXCEPTIONS_SIG n
# else
# define _LIBCPP_EXCEPTIONS_SIG e
# endif

# if defined(__POINTER_FIELD_PROTECTION__)
# define _LIBCPP_PFP_SIG p
# else
# define _LIBCPP_PFP_SIG
# endif
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My understanding is that pfp changes the layout of certain types? Why should there be an ABI tag for it?

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Yes, the in-memory pointer format changes so it's effectively a layout (ABI) change. Therefore we need an ABI tag change to detect/prevent linking against mismatching ABIs. This was requested by @mordante in #133538.

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That's only for ceses where we want different TUs to link together. Since PFP changes the layout of types that's not something we want users to do, which in turn means that we don't want to make it visible in the ABI tag. We should instead change the whole inline namespace.

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Okay, I removed this logic and added CMake logic to modify the namespace name if PFP is enabled.


# define _LIBCPP_ODR_SIGNATURE \
_LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_VERSION)
_LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_PFP_SIG), \
_LIBCPP_VERSION)

// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved
// on two levels:
Expand Down Expand Up @@ -1262,6 +1275,14 @@ typedef __char32_t char32_t;
# define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 0
# endif

# if defined(__POINTER_FIELD_PROTECTION__)
# define _LIBCPP_PFP [[clang::pointer_field_protection]]
# define _LIBCPP_NO_PFP [[clang::no_field_protection]]
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These should be _Uglified. Do these attributes do anything with pfp disabled? If no, why not simply check for their availability like with other attributes?

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[[clang::pointer_field_protection]] will enable PFP on a type even if the command line flag is not passed, so we should avoid it when PFP is not enabled on the command line to avoid ABI breaks.

Checking attribute availability for [[clang::no_field_protection]] sounds fine to me.

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Done

# else
# define _LIBCPP_PFP
# define _LIBCPP_NO_PFP
# endif

#endif // __cplusplus

#endif // _LIBCPP___CONFIG
3 changes: 3 additions & 0 deletions libcxx/include/__type_traits/is_trivially_relocatable.h
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Original file line number Diff line number Diff line change
Expand Up @@ -34,10 +34,13 @@ template <class _Tp, class = void>
struct __libcpp_is_trivially_relocatable : is_trivially_copyable<_Tp> {};
#endif

// __trivially_relocatable on libc++'s builtin types does not currently return the right answer with PFP.
#if !defined(__POINTER_FIELD_PROTECTION__)
template <class _Tp>
struct __libcpp_is_trivially_relocatable<_Tp,
__enable_if_t<is_same<_Tp, typename _Tp::__trivially_relocatable>::value> >
: true_type {};
#endif

_LIBCPP_END_NAMESPACE_STD

Expand Down
2 changes: 1 addition & 1 deletion libcxx/include/typeinfo
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Expand Up @@ -300,7 +300,7 @@ class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH type_info
protected:
typedef __type_info_implementations::__impl __impl;

__impl::__type_name_t __type_name;
_LIBCPP_NO_PFP __impl::__type_name_t __type_name;

_LIBCPP_HIDE_FROM_ABI explicit type_info(const char* __n) : __type_name(__impl::__string_to_type_name(__n)) {}

Expand Down
15 changes: 15 additions & 0 deletions libcxx/test/libcxx/gdb/gdb_pretty_printer_test.sh.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -256,9 +256,12 @@ void unique_ptr_test() {
ComparePrettyPrintToRegex(std::move(forty_two),
R"(std::unique_ptr<int> containing = {__ptr_ = 0x[a-f0-9]+})");

#if !defined(__POINTER_FIELD_PROTECTION__)
// GDB doesn't know how to read PFP fields correctly yet.
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Does GCC have pfp in general? If not, IMO we should just disable the pretty printer test with pfp enabled.

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The support for this feature in GCC is independent of support in GDB. We could imagine debug info extensions being developed in the future to make it possible for this to pass in GDB even without GCC support.

That being said, disabling the test is also fine with me.

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Done

std::unique_ptr<int> this_is_null;
ComparePrettyPrintToChars(std::move(this_is_null),
R"(std::unique_ptr is nullptr)");
#endif
}

void bitset_test() {
Expand Down Expand Up @@ -354,6 +357,8 @@ void map_test() {
}

void multimap_test() {
#if !defined(__POINTER_FIELD_PROTECTION__)
// GDB doesn't know how to read PFP fields correctly yet.
std::multimap<int, int> i_am_empty{};
ComparePrettyPrintToChars(i_am_empty, "std::multimap is empty");

Expand All @@ -369,6 +374,7 @@ void multimap_test() {
"std::multimap with 6 elements = "
R"({[1] = "one", [1] = "ein", [1] = "bir", )"
R"([2] = "two", [2] = "zwei", [3] = "three"})");
#endif
}

void queue_test() {
Expand Down Expand Up @@ -441,13 +447,16 @@ void stack_test() {
}

void multiset_test() {
#if !defined(__POINTER_FIELD_PROTECTION__)
// GDB doesn't know how to read PFP fields correctly yet.
std::multiset<int> i_am_empty;
ComparePrettyPrintToChars(i_am_empty, "std::multiset is empty");

std::multiset<std::string> one_two_three {"1:one", "2:two", "3:three", "1:one"};
ComparePrettyPrintToChars(one_two_three,
"std::multiset with 4 elements = {"
R"("1:one", "1:one", "2:two", "3:three"})");
#endif
}

void vector_test() {
Expand Down Expand Up @@ -481,10 +490,13 @@ void vector_test() {
"std::vector of length "
"3, capacity 3 = {5, 6, 7}");

#if !defined(__POINTER_FIELD_PROTECTION__)
// GDB doesn't know how to read PFP fields correctly yet.
std::vector<int, UncompressibleAllocator<int>> test3({7, 8});
ComparePrettyPrintToChars(std::move(test3),
"std::vector of length "
"2, capacity 2 = {7, 8}");
#endif
}

void set_iterator_test() {
Expand Down Expand Up @@ -655,8 +667,11 @@ void shared_ptr_test() {
test0,
R"(std::shared_ptr<int> count [3\?], weak [0\?]( \(libc\+\+ missing debug info\))? containing = {__ptr_ = 0x[a-f0-9]+})");

#if !defined(__POINTER_FIELD_PROTECTION__)
// GDB doesn't know how to read PFP fields correctly yet.
std::shared_ptr<const int> test3;
ComparePrettyPrintToChars(test3, "std::shared_ptr is nullptr");
#endif
}

void streampos_test() {
Expand Down
68 changes: 37 additions & 31 deletions libcxx/test/libcxx/type_traits/is_trivially_relocatable.compile.pass.cpp
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Expand Up @@ -26,6 +26,12 @@
# include <locale>
#endif

#if defined(__POINTER_FIELD_PROTECTION__)
constexpr bool pfp_disabled = false;
#else
constexpr bool pfp_disabled = true;
#endif
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Again, can we just disable the test instead?

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That's fine with me I suppose. The correct result for __libcpp_is_trivially_relocatable is implicitly tested by the other tests (which would crash if it was wrong).

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Done


static_assert(std::__libcpp_is_trivially_relocatable<char>::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<int>::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<double>::value, "");
Expand Down Expand Up @@ -68,8 +74,8 @@ static_assert(!std::__libcpp_is_trivially_relocatable<NonTrivialDestructor>::val
// ----------------------

// __split_buffer
static_assert(std::__libcpp_is_trivially_relocatable<std::__split_buffer<int> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::__split_buffer<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::__split_buffer<int> >::value == pfp_disabled, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::__split_buffer<NotTriviallyCopyable> >::value == pfp_disabled, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::__split_buffer<int, test_allocator<int> > >::value, "");

// standard library types
Expand All @@ -82,7 +88,7 @@ static_assert(std::__libcpp_is_trivially_relocatable<std::array<std::unique_ptr<

static_assert(std::__libcpp_is_trivially_relocatable<std::array<int, 1> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::array<NotTriviallyCopyable, 1> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::array<std::unique_ptr<int>, 1> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::array<std::unique_ptr<int>, 1> >::value == pfp_disabled, "");

// basic_string
#if !__has_feature(address_sanitizer) || !_LIBCPP_INSTRUMENTED_WITH_ASAN
Expand All @@ -97,17 +103,17 @@ struct NotTriviallyRelocatableCharTraits : constexpr_char_traits<T> {
};

static_assert(std::__libcpp_is_trivially_relocatable<
std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::value,
std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::value == pfp_disabled,
"");
static_assert(std::__libcpp_is_trivially_relocatable<
std::basic_string<char, NotTriviallyRelocatableCharTraits<char>, std::allocator<char> > >::value,
std::basic_string<char, NotTriviallyRelocatableCharTraits<char>, std::allocator<char> > >::value == pfp_disabled,
"");
static_assert(std::__libcpp_is_trivially_relocatable<
std::basic_string<MyChar, constexpr_char_traits<MyChar>, std::allocator<MyChar> > >::value,
std::basic_string<MyChar, constexpr_char_traits<MyChar>, std::allocator<MyChar> > >::value == pfp_disabled,
"");
static_assert(
std::__libcpp_is_trivially_relocatable<
std::basic_string<MyChar, NotTriviallyRelocatableCharTraits<MyChar>, std::allocator<MyChar> > >::value,
std::basic_string<MyChar, NotTriviallyRelocatableCharTraits<MyChar>, std::allocator<MyChar> > >::value == pfp_disabled,
"");
static_assert(!std::__libcpp_is_trivially_relocatable<
std::basic_string<char, std::char_traits<char>, test_allocator<char> > >::value,
Expand All @@ -119,21 +125,21 @@ static_assert(
#endif

// deque
static_assert(std::__libcpp_is_trivially_relocatable<std::deque<int> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::deque<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::deque<int> >::value == pfp_disabled, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::deque<NotTriviallyCopyable> >::value == pfp_disabled, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::deque<int, test_allocator<int> > >::value, "");

// exception_ptr
#ifndef _LIBCPP_ABI_MICROSOFT // FIXME: Is this also the case on windows?
static_assert(std::__libcpp_is_trivially_relocatable<std::exception_ptr>::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::exception_ptr>::value == pfp_disabled, "");
#endif

// expected
#if TEST_STD_VER >= 23
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<int, int> >::value);
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<std::unique_ptr<int>, int>>::value);
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<int, std::unique_ptr<int>>>::value);
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<std::unique_ptr<int>, std::unique_ptr<int>>>::value);
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<int, int> >::value == pfp_disabled);
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<std::unique_ptr<int>, int>>::value == pfp_disabled);
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<int, std::unique_ptr<int>>>::value == pfp_disabled);
static_assert(std::__libcpp_is_trivially_relocatable<std::expected<std::unique_ptr<int>, std::unique_ptr<int>>>::value == pfp_disabled);

static_assert(!std::__libcpp_is_trivially_relocatable<std::expected<int, NotTriviallyCopyable>>::value);
static_assert(!std::__libcpp_is_trivially_relocatable<std::expected<NotTriviallyCopyable, int>>::value);
Expand All @@ -143,42 +149,42 @@ static_assert(

// locale
#ifndef TEST_HAS_NO_LOCALIZATION
static_assert(std::__libcpp_is_trivially_relocatable<std::locale>::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::locale>::value == pfp_disabled, "");
#endif

// optional
#if TEST_STD_VER >= 17
static_assert(std::__libcpp_is_trivially_relocatable<std::optional<int>>::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::optional<NotTriviallyCopyable>>::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::optional<std::unique_ptr<int>>>::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::optional<std::unique_ptr<int>>>::value == pfp_disabled, "");
#endif // TEST_STD_VER >= 17

// pair
static_assert(std::__libcpp_is_trivially_relocatable<std::pair<int, int> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::pair<int, int> >::value == pfp_disabled, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::pair<NotTriviallyCopyable, int> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::pair<int, NotTriviallyCopyable> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::pair<NotTriviallyCopyable, NotTriviallyCopyable> >::value,
"");
static_assert(std::__libcpp_is_trivially_relocatable<std::pair<std::unique_ptr<int>, std::unique_ptr<int> > >::value,
static_assert(std::__libcpp_is_trivially_relocatable<std::pair<std::unique_ptr<int>, std::unique_ptr<int> > >::value == pfp_disabled,
"");

// shared_ptr
static_assert(std::__libcpp_is_trivially_relocatable<std::shared_ptr<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::shared_ptr<NotTriviallyCopyable> >::value == pfp_disabled, "");

// tuple
#if TEST_STD_VER >= 11
static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<> >::value, "");

static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<int> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<int> >::value == pfp_disabled, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::tuple<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<std::unique_ptr<int> > >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<std::unique_ptr<int> > >::value == pfp_disabled, "");

static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<int, int> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<int, int> >::value == pfp_disabled, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::tuple<NotTriviallyCopyable, int> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::tuple<int, NotTriviallyCopyable> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::tuple<NotTriviallyCopyable, NotTriviallyCopyable> >::value,
"");
static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<std::unique_ptr<int>, std::unique_ptr<int> > >::value,
static_assert(std::__libcpp_is_trivially_relocatable<std::tuple<std::unique_ptr<int>, std::unique_ptr<int> > >::value == pfp_disabled,
"");
#endif // TEST_STD_VER >= 11

Expand All @@ -203,9 +209,9 @@ struct NotTriviallyRelocatablePointer {
void operator()(T*);
};

static_assert(std::__libcpp_is_trivially_relocatable<std::unique_ptr<int> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::unique_ptr<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::unique_ptr<int[]> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::unique_ptr<int> >::value == pfp_disabled, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::unique_ptr<NotTriviallyCopyable> >::value == pfp_disabled, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::unique_ptr<int[]> >::value == pfp_disabled, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::unique_ptr<int, NotTriviallyRelocatableDeleter> >::value,
"");
static_assert(!std::__libcpp_is_trivially_relocatable<std::unique_ptr<int[], NotTriviallyRelocatableDeleter> >::value,
Expand All @@ -219,23 +225,23 @@ static_assert(!std::__libcpp_is_trivially_relocatable<std::unique_ptr<int[], Not
#if TEST_STD_VER >= 17
static_assert(std::__libcpp_is_trivially_relocatable<std::variant<int> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::variant<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::variant<std::unique_ptr<int> > >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::variant<std::unique_ptr<int> > >::value == pfp_disabled, "");

static_assert(std::__libcpp_is_trivially_relocatable<std::variant<int, int> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::variant<NotTriviallyCopyable, int> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::variant<int, NotTriviallyCopyable> >::value, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::variant<NotTriviallyCopyable, NotTriviallyCopyable> >::value,
"");
static_assert(std::__libcpp_is_trivially_relocatable<std::variant<std::unique_ptr<int>, std::unique_ptr<int> > >::value,
static_assert(std::__libcpp_is_trivially_relocatable<std::variant<std::unique_ptr<int>, std::unique_ptr<int> > >::value == pfp_disabled,
"");
#endif // TEST_STD_VER >= 17

// vector
static_assert(std::__libcpp_is_trivially_relocatable<std::vector<int> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::vector<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::vector<int> >::value == pfp_disabled, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::vector<NotTriviallyCopyable> >::value == pfp_disabled, "");
static_assert(!std::__libcpp_is_trivially_relocatable<std::vector<int, test_allocator<int> > >::value, "");

// weak_ptr
static_assert(std::__libcpp_is_trivially_relocatable<std::weak_ptr<NotTriviallyCopyable> >::value, "");
static_assert(std::__libcpp_is_trivially_relocatable<std::weak_ptr<NotTriviallyCopyable> >::value == pfp_disabled, "");

// TODO: Mark all the trivially relocatable STL types as such
10 changes: 10 additions & 0 deletions libcxxabi/include/__cxxabi_config.h
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Expand Up @@ -109,4 +109,14 @@
# define _LIBCXXABI_NOEXCEPT noexcept
#endif

#if defined(_LIBCXXABI_COMPILER_CLANG)
# if defined(__POINTER_FIELD_PROTECTION__)
# define _LIBCXXABI_NO_PFP [[clang::no_field_protection]]
# else
# define _LIBCXXABI_NO_PFP
# endif
#else
# define _LIBCXXABI_NO_PFP
#endif
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Why is this different from the libc++ version?

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It makes sense to change it to be the same. I'll do that. This was a leftover from when __POINTER_FIELD_PROTECTION__ was under __has_extension.

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Done


#endif // ____CXXABI_CONFIG_H
6 changes: 3 additions & 3 deletions libcxxabi/src/private_typeinfo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,7 @@ class _LIBCXXABI_TYPE_VIS __class_type_info : public __shim_type_info {
// Has one non-virtual public base class at offset zero
class _LIBCXXABI_TYPE_VIS __si_class_type_info : public __class_type_info {
public:
const __class_type_info *__base_type;
_LIBCXXABI_NO_PFP const __class_type_info *__base_type;

_LIBCXXABI_HIDDEN virtual ~__si_class_type_info();

Expand Down Expand Up @@ -204,7 +204,7 @@ class _LIBCXXABI_TYPE_VIS __vmi_class_type_info : public __class_type_info {
class _LIBCXXABI_TYPE_VIS __pbase_type_info : public __shim_type_info {
public:
unsigned int __flags;
const __shim_type_info *__pointee;
_LIBCXXABI_NO_PFP const __shim_type_info *__pointee;

enum __masks {
__const_mask = 0x1,
Expand Down Expand Up @@ -245,7 +245,7 @@ class _LIBCXXABI_TYPE_VIS __pointer_type_info : public __pbase_type_info {
class _LIBCXXABI_TYPE_VIS __pointer_to_member_type_info
: public __pbase_type_info {
public:
const __class_type_info *__context;
_LIBCXXABI_NO_PFP const __class_type_info *__context;

_LIBCXXABI_HIDDEN virtual ~__pointer_to_member_type_info();
_LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
Expand Down
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