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libstdc++: shrink-to-fit in std::basic_stacktrace::current(skip, max)

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If a large stacktrace is reduced to a max depth that is less than half
the capacity it will now be reallocated to remove the unused capacity.

libstdc++-v3/ChangeLog:

	* include/std/stacktrace (basic_stacktrace::current): Reallocate
	a smaller container if the unused capacity is larger than the
	used size.
This commit is contained in:
Jonathan Wakely 2022-04-12 17:17:20 +01:00
parent 7cf8875995
commit b2c007b87d
1 changed files with 14 additions and 1 deletions
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15
libstdc++-v3/include/std/stacktrace
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@ -289,7 +289,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (__err < 0)
__ret._M_clear();
else if (__ret.size() > __max_depth)
__ret._M_impl._M_resize(__max_depth, __ret._M_alloc);
{
__ret._M_impl._M_resize(__max_depth, __ret._M_alloc);
if (__ret._M_impl._M_capacity / 2 >= __max_depth)
{
// shrink to fit
_Impl __tmp = __ret._M_impl._M_clone(__ret._M_alloc);
if (__tmp._M_capacity)
{
__ret._M_clear();
__ret._M_impl = __tmp;
}
}
}
}
return __ret;
}