A user pointed out that, in DAP mode, gdb would hang while trying to
display a certain vector.  See

    https://sourceware.org/bugzilla/show_bug.cgi?id=33594

This is caused by a combination of things: the vector is
uninitialized, DAP requires a count of the number of children of a
variable, and libstdc++ printers don't implement the 'num_children'
method, so gdb tries to count children by iterating.

In this case, the vector has a nonsensical size:

    (gdb) p myVector
    $1 = std::vector of length -34979931, capacity -33992726

This patch adds a 'num_children' method to a subset of the
pretty-printers, in particular ones where I thought the length might
be arbitrarily large and susceptible to being garbage when the object
isn't initialized.

I've also specifically added a check to the vector printer for the
case where the length is negative.

These container printers could be further improved by adding the
'child' method, allowing random access to child objects.  However I
haven't done that here.

libstdc++-v3/ChangeLog

	* python/libstdcxx/v6/printers.py (StdVectorPrinter._bounds):
	New method.
	(StdVectorPrinter.to_string): Use it.
	(StdVectorPrinter.num_children): New method.
	(StdStackOrQueuePrinter.num_children): New method.
	(StdMapPrinter.num_children): New method.
	(StdSetPrinter.num_children): New method.
	(StdDequePrinter._size): New method.
	(StdDequePrinter.to_string): Use it.
	(StdDequePrinter.num_children): New method.
	(Tr1UnorderedSetPrinter.num_children): New method.
	(Tr1UnorderedMapPrinter.num_children): New method.
	(StdSpanPrinter.num_children): New method.

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py (StdStacktraceEntryPrinter):
	New printer for std::stacktrace_entry.
	(StdStacktracePrinter): New printer for std::basic_stacktrace.

Previously, atomic<shared_ptr<T>>::wait (and the weak_ptr version) was
equivalent to waiting directly on _M_val, which corresponds to the pointer
to the control block (_M_pi). Consequently, wakeups were not triggered if
the stored pointer value was changed to a pointer that uses the same control
block but stores pointer to a different object. Such a pointer can be
constructed using an aliasing constructor.

To address this, wait now uses a generic proxy wait
std::__atomic_wait_address function, which supports waiting until any
predicate is satisfied. The provided predicate now compares both the control
block (_M_pi) and the stored pointer (_M_ptr). Comparing the latter requires
locking the pointer.

Since this function operates on raw pointers, the type of _M_val was changed
from __atomic_base<uintptr_t> to uintptr_t. Invocations of the corresponding
member functions are now replaced with direct use of __atomic builtins.

	PR libstdc++/118757

libstdc++-v3/ChangeLog:

	* include/bits/shared_ptr_atomic.h (_Atomic_count::_M_wait_unlock):
	Add parameter capturing reference to _M_ptr. Reimplement in terms
	of __atomic_wait_address.
	(_Atomic_count::~_Atomic_count, _Atomic_count::lock)
	(_Atomic_count::unlock, _Atomic_count::_M_swap_unlock): Replace
	invocation of atomic member funcitons with __atomic builtins.
	(_Atomic_count::notify_one, _Atomic_count::notify_all):
	Use __atomic_notify_address.
	(_Sp_atomic::element_type): Define.
	(_Sp_atomic::_M_val): Change type to uintptr_t.
	(_Sp_atomic::wait): Pass _M_ptr to _M_wait_unlock.
	* python/libstdcxx/v6/printers.py:
	* testsuite/20_util/shared_ptr/atomic/pr118757.cc: New test.
	* testsuite/20_util/weak_ptr/pr118757.cc: New test.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>

libatomic/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* testsuite/Makefile.in: Regenerate.

libcc1/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.

libffi/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* include/Makefile.in: Regenerate.
	* man/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

libgcobol/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.

libgfortran/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.

libgm2/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* libm2cor/Makefile.in: Regenerate.
	* libm2iso/Makefile.in: Regenerate.
	* libm2log/Makefile.in: Regenerate.
	* libm2min/Makefile.in: Regenerate.
	* libm2pim/Makefile.in: Regenerate.

libgomp/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* testsuite/Makefile.in: Regenerate.

libgrust/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* libformat_parser/Makefile.in: Regenerate.
	* libproc_macro_internal/Makefile.in: Regenerate.

libitm/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* testsuite/Makefile.in: Regenerate.

libobjc/ChangeLog:

	* aclocal.m4: Regenerate.
	* configure: Regenerate.

libphobos/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* libdruntime/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

libquadmath/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.

libsanitizer/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* asan/Makefile.in: Regenerate.
	* configure: Regenerate.
	* hwasan/Makefile.in: Regenerate.
	* interception/Makefile.in: Regenerate.
	* libbacktrace/Makefile.in: Regenerate.
	* lsan/Makefile.in: Regenerate.
	* sanitizer_common/Makefile.in: Regenerate.
	* tsan/Makefile.in: Regenerate.
	* ubsan/Makefile.in: Regenerate.

libssp/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* doc/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++20/Makefile.in: Regenerate.
	* src/c++23/Makefile.in: Regenerate.
	* src/c++26/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/experimental/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* src/libbacktrace/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

libvtv/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* testsuite/Makefile.in: Regenerate.

lto-plugin/ChangeLog:

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.

For any minimum value of a signed type, its negation (with wraparound) results
in the same value, behaving like zero. Representing the unordered result with
this minimum value, along with 0 for equal, 1 for greater, and -1 for less
in partial_ordering, allows its value to be reversed using unary negation.

The operator<=(partial_order, 0) now checks if the reversed value is positive.
This works correctly because the unordered value remains unchanged and thus
negative.

libstdc++-v3/ChangeLog:

	* libsupc++/compare (_Ncmp::_Unordered): Rename and change the value
	to minimum value of signed char.
	(_Ncomp::unordered): Renamed from _Unordered, the name is reserved
	by partial_ordered::unordered.
	(partial_ordering::_M_reverse()): Define.
	(operator<=(partial_ordering, __cmp_cat::__unspec))
	(operator>=(__cmp_cat::__unspec, partial_ordering)): Implemented
	in terms of negated _M_value.
	(operator>=(partial_ordering, __cmp_cat::__unspec))
	(operator<=(__cmp_cat::__unspec, partial_ordering)): Directly
	compare _M_value, as unordered value is negative.
	(partial_ordering::unordered): Handle _Ncmp::unoredred rename.
	* python/libstdcxx/v6/printers.py: Add -128 as integer value
	for unordered, keeping 2 to preserve backward compatibility.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>

I added some gdb.execute('skip -rfu ...') commands to the Python hook
loaded with libstdc++.so but this makes GDB print output like:

Function(s) ^std::(move|forward|as_const|(__)?addressof) will be skipped when stepping.

This probably aren't interesting to users, so this change suppresses
that output by capturing the output into the gdb.execute return value
(which is then ignored). An exception is thrown if the gdb.execute
command fails, so this doesn't suppress any errors which might be
meaningful to users or libstdc++ developers.

libstdc++-v3/ChangeLog:

	PR libstdc++/118260
	* python/hook.in: Suppress output from gdb.execute calls to
	register skips.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/118260
	* python/hook.in: Run 'skip' commands for some simple accessor
	functions.

Register StdIntegralConstantPrinter with the other C++11 printers, and
register StdTextEncodingPrinter after C++20 printers.

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py: Reorder registrations.

python/libstdcxx/v6/printers.py:1355: DeprecationWarning: 'count' is passed as positional argument

The Python docs say:

  Deprecated since version 3.13: Passing count and flags as positional
  arguments is deprecated. In future Python versions they will be
  keyword-only parameters.

Using a keyword argument for count only became possible with Python 3.1
so introduce a new function to do the substitution.

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py (strip_fundts_namespace): New.
	(StdExpAnyPrinter, StdExpOptionalPrinter): Use it.