On OpenBSD, malloc introspection (e.g., malloc_usable_size or
malloc_size) is not provided by the platform allocator. Since allocator
introspection is currently a load-bearing piece of functionality for
ManagedBuffer and ManagedBufferPointer, pending any API changes, as a
stopgap measure, this commit marks methods in ManagedBuffer and
ManagedBufferPointer calling _swift_stdlib_malloc_size and methods
dependent thereon unavailable on OpenBSD.
This may induce some compatibility issues for some files, but at least
this change ensures that we can get stdlib to build on this platform
until the evolution process addresses this problem more thoroughly.
The removed check was dependent on the malloc implementation of the target operating system, because it asks for a real size of the allocated memory block. Usually, there is only a minor over-allocation due to the way how most malloc implementations work. But this is not guaranteed to hold for any malloc implementation.
rdar://problem/32315336
This decreases total testing time by over a minute on my old Mac Pro.
It probably has much less effect on systems with fewer cores, but shouldn't
be any worse there.
Swift SVN r22745
A revamped version of HeapBuffer that doesn't allow null buffer
references. Something like this is needed for killing the null array
state.
Swift SVN r22683
Make unique reference checking available to users, making ManagedBuffer
a complete facility for building COW value types. Also rationalize the
way we name and organize the runtime primitives we ultimately call.
Swift SVN r22594
