Update prebuilt Clang to r416183b from Android.
https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef
clang 12.0.5 (based on r416183b) from build 7284624.
Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/python3/lib/python3.9/asyncio/futures.py b/linux-x64/clang/python3/lib/python3.9/asyncio/futures.py
new file mode 100644
index 0000000..bed4da5
--- /dev/null
+++ b/linux-x64/clang/python3/lib/python3.9/asyncio/futures.py
@@ -0,0 +1,423 @@
+"""A Future class similar to the one in PEP 3148."""
+
+__all__ = (
+ 'Future', 'wrap_future', 'isfuture',
+)
+
+import concurrent.futures
+import contextvars
+import logging
+import sys
+
+from . import base_futures
+from . import events
+from . import exceptions
+from . import format_helpers
+
+
+isfuture = base_futures.isfuture
+
+
+_PENDING = base_futures._PENDING
+_CANCELLED = base_futures._CANCELLED
+_FINISHED = base_futures._FINISHED
+
+
+STACK_DEBUG = logging.DEBUG - 1 # heavy-duty debugging
+
+
+class Future:
+ """This class is *almost* compatible with concurrent.futures.Future.
+
+ Differences:
+
+ - This class is not thread-safe.
+
+ - result() and exception() do not take a timeout argument and
+ raise an exception when the future isn't done yet.
+
+ - Callbacks registered with add_done_callback() are always called
+ via the event loop's call_soon().
+
+ - This class is not compatible with the wait() and as_completed()
+ methods in the concurrent.futures package.
+
+ (In Python 3.4 or later we may be able to unify the implementations.)
+ """
+
+ # Class variables serving as defaults for instance variables.
+ _state = _PENDING
+ _result = None
+ _exception = None
+ _loop = None
+ _source_traceback = None
+ _cancel_message = None
+ # A saved CancelledError for later chaining as an exception context.
+ _cancelled_exc = None
+
+ # This field is used for a dual purpose:
+ # - Its presence is a marker to declare that a class implements
+ # the Future protocol (i.e. is intended to be duck-type compatible).
+ # The value must also be not-None, to enable a subclass to declare
+ # that it is not compatible by setting this to None.
+ # - It is set by __iter__() below so that Task._step() can tell
+ # the difference between
+ # `await Future()` or`yield from Future()` (correct) vs.
+ # `yield Future()` (incorrect).
+ _asyncio_future_blocking = False
+
+ __log_traceback = False
+
+ def __init__(self, *, loop=None):
+ """Initialize the future.
+
+ The optional event_loop argument allows explicitly setting the event
+ loop object used by the future. If it's not provided, the future uses
+ the default event loop.
+ """
+ if loop is None:
+ self._loop = events.get_event_loop()
+ else:
+ self._loop = loop
+ self._callbacks = []
+ if self._loop.get_debug():
+ self._source_traceback = format_helpers.extract_stack(
+ sys._getframe(1))
+
+ _repr_info = base_futures._future_repr_info
+
+ def __repr__(self):
+ return '<{} {}>'.format(self.__class__.__name__,
+ ' '.join(self._repr_info()))
+
+ def __del__(self):
+ if not self.__log_traceback:
+ # set_exception() was not called, or result() or exception()
+ # has consumed the exception
+ return
+ exc = self._exception
+ context = {
+ 'message':
+ f'{self.__class__.__name__} exception was never retrieved',
+ 'exception': exc,
+ 'future': self,
+ }
+ if self._source_traceback:
+ context['source_traceback'] = self._source_traceback
+ self._loop.call_exception_handler(context)
+
+ def __class_getitem__(cls, type):
+ return cls
+
+ @property
+ def _log_traceback(self):
+ return self.__log_traceback
+
+ @_log_traceback.setter
+ def _log_traceback(self, val):
+ if bool(val):
+ raise ValueError('_log_traceback can only be set to False')
+ self.__log_traceback = False
+
+ def get_loop(self):
+ """Return the event loop the Future is bound to."""
+ loop = self._loop
+ if loop is None:
+ raise RuntimeError("Future object is not initialized.")
+ return loop
+
+ def _make_cancelled_error(self):
+ """Create the CancelledError to raise if the Future is cancelled.
+
+ This should only be called once when handling a cancellation since
+ it erases the saved context exception value.
+ """
+ if self._cancel_message is None:
+ exc = exceptions.CancelledError()
+ else:
+ exc = exceptions.CancelledError(self._cancel_message)
+ exc.__context__ = self._cancelled_exc
+ # Remove the reference since we don't need this anymore.
+ self._cancelled_exc = None
+ return exc
+
+ def cancel(self, msg=None):
+ """Cancel the future and schedule callbacks.
+
+ If the future is already done or cancelled, return False. Otherwise,
+ change the future's state to cancelled, schedule the callbacks and
+ return True.
+ """
+ self.__log_traceback = False
+ if self._state != _PENDING:
+ return False
+ self._state = _CANCELLED
+ self._cancel_message = msg
+ self.__schedule_callbacks()
+ return True
+
+ def __schedule_callbacks(self):
+ """Internal: Ask the event loop to call all callbacks.
+
+ The callbacks are scheduled to be called as soon as possible. Also
+ clears the callback list.
+ """
+ callbacks = self._callbacks[:]
+ if not callbacks:
+ return
+
+ self._callbacks[:] = []
+ for callback, ctx in callbacks:
+ self._loop.call_soon(callback, self, context=ctx)
+
+ def cancelled(self):
+ """Return True if the future was cancelled."""
+ return self._state == _CANCELLED
+
+ # Don't implement running(); see http://bugs.python.org/issue18699
+
+ def done(self):
+ """Return True if the future is done.
+
+ Done means either that a result / exception are available, or that the
+ future was cancelled.
+ """
+ return self._state != _PENDING
+
+ def result(self):
+ """Return the result this future represents.
+
+ If the future has been cancelled, raises CancelledError. If the
+ future's result isn't yet available, raises InvalidStateError. If
+ the future is done and has an exception set, this exception is raised.
+ """
+ if self._state == _CANCELLED:
+ exc = self._make_cancelled_error()
+ raise exc
+ if self._state != _FINISHED:
+ raise exceptions.InvalidStateError('Result is not ready.')
+ self.__log_traceback = False
+ if self._exception is not None:
+ raise self._exception
+ return self._result
+
+ def exception(self):
+ """Return the exception that was set on this future.
+
+ The exception (or None if no exception was set) is returned only if
+ the future is done. If the future has been cancelled, raises
+ CancelledError. If the future isn't done yet, raises
+ InvalidStateError.
+ """
+ if self._state == _CANCELLED:
+ exc = self._make_cancelled_error()
+ raise exc
+ if self._state != _FINISHED:
+ raise exceptions.InvalidStateError('Exception is not set.')
+ self.__log_traceback = False
+ return self._exception
+
+ def add_done_callback(self, fn, *, context=None):
+ """Add a callback to be run when the future becomes done.
+
+ The callback is called with a single argument - the future object. If
+ the future is already done when this is called, the callback is
+ scheduled with call_soon.
+ """
+ if self._state != _PENDING:
+ self._loop.call_soon(fn, self, context=context)
+ else:
+ if context is None:
+ context = contextvars.copy_context()
+ self._callbacks.append((fn, context))
+
+ # New method not in PEP 3148.
+
+ def remove_done_callback(self, fn):
+ """Remove all instances of a callback from the "call when done" list.
+
+ Returns the number of callbacks removed.
+ """
+ filtered_callbacks = [(f, ctx)
+ for (f, ctx) in self._callbacks
+ if f != fn]
+ removed_count = len(self._callbacks) - len(filtered_callbacks)
+ if removed_count:
+ self._callbacks[:] = filtered_callbacks
+ return removed_count
+
+ # So-called internal methods (note: no set_running_or_notify_cancel()).
+
+ def set_result(self, result):
+ """Mark the future done and set its result.
+
+ If the future is already done when this method is called, raises
+ InvalidStateError.
+ """
+ if self._state != _PENDING:
+ raise exceptions.InvalidStateError(f'{self._state}: {self!r}')
+ self._result = result
+ self._state = _FINISHED
+ self.__schedule_callbacks()
+
+ def set_exception(self, exception):
+ """Mark the future done and set an exception.
+
+ If the future is already done when this method is called, raises
+ InvalidStateError.
+ """
+ if self._state != _PENDING:
+ raise exceptions.InvalidStateError(f'{self._state}: {self!r}')
+ if isinstance(exception, type):
+ exception = exception()
+ if type(exception) is StopIteration:
+ raise TypeError("StopIteration interacts badly with generators "
+ "and cannot be raised into a Future")
+ self._exception = exception
+ self._state = _FINISHED
+ self.__schedule_callbacks()
+ self.__log_traceback = True
+
+ def __await__(self):
+ if not self.done():
+ self._asyncio_future_blocking = True
+ yield self # This tells Task to wait for completion.
+ if not self.done():
+ raise RuntimeError("await wasn't used with future")
+ return self.result() # May raise too.
+
+ __iter__ = __await__ # make compatible with 'yield from'.
+
+
+# Needed for testing purposes.
+_PyFuture = Future
+
+
+def _get_loop(fut):
+ # Tries to call Future.get_loop() if it's available.
+ # Otherwise fallbacks to using the old '_loop' property.
+ try:
+ get_loop = fut.get_loop
+ except AttributeError:
+ pass
+ else:
+ return get_loop()
+ return fut._loop
+
+
+def _set_result_unless_cancelled(fut, result):
+ """Helper setting the result only if the future was not cancelled."""
+ if fut.cancelled():
+ return
+ fut.set_result(result)
+
+
+def _convert_future_exc(exc):
+ exc_class = type(exc)
+ if exc_class is concurrent.futures.CancelledError:
+ return exceptions.CancelledError(*exc.args)
+ elif exc_class is concurrent.futures.TimeoutError:
+ return exceptions.TimeoutError(*exc.args)
+ elif exc_class is concurrent.futures.InvalidStateError:
+ return exceptions.InvalidStateError(*exc.args)
+ else:
+ return exc
+
+
+def _set_concurrent_future_state(concurrent, source):
+ """Copy state from a future to a concurrent.futures.Future."""
+ assert source.done()
+ if source.cancelled():
+ concurrent.cancel()
+ if not concurrent.set_running_or_notify_cancel():
+ return
+ exception = source.exception()
+ if exception is not None:
+ concurrent.set_exception(_convert_future_exc(exception))
+ else:
+ result = source.result()
+ concurrent.set_result(result)
+
+
+def _copy_future_state(source, dest):
+ """Internal helper to copy state from another Future.
+
+ The other Future may be a concurrent.futures.Future.
+ """
+ assert source.done()
+ if dest.cancelled():
+ return
+ assert not dest.done()
+ if source.cancelled():
+ dest.cancel()
+ else:
+ exception = source.exception()
+ if exception is not None:
+ dest.set_exception(_convert_future_exc(exception))
+ else:
+ result = source.result()
+ dest.set_result(result)
+
+
+def _chain_future(source, destination):
+ """Chain two futures so that when one completes, so does the other.
+
+ The result (or exception) of source will be copied to destination.
+ If destination is cancelled, source gets cancelled too.
+ Compatible with both asyncio.Future and concurrent.futures.Future.
+ """
+ if not isfuture(source) and not isinstance(source,
+ concurrent.futures.Future):
+ raise TypeError('A future is required for source argument')
+ if not isfuture(destination) and not isinstance(destination,
+ concurrent.futures.Future):
+ raise TypeError('A future is required for destination argument')
+ source_loop = _get_loop(source) if isfuture(source) else None
+ dest_loop = _get_loop(destination) if isfuture(destination) else None
+
+ def _set_state(future, other):
+ if isfuture(future):
+ _copy_future_state(other, future)
+ else:
+ _set_concurrent_future_state(future, other)
+
+ def _call_check_cancel(destination):
+ if destination.cancelled():
+ if source_loop is None or source_loop is dest_loop:
+ source.cancel()
+ else:
+ source_loop.call_soon_threadsafe(source.cancel)
+
+ def _call_set_state(source):
+ if (destination.cancelled() and
+ dest_loop is not None and dest_loop.is_closed()):
+ return
+ if dest_loop is None or dest_loop is source_loop:
+ _set_state(destination, source)
+ else:
+ dest_loop.call_soon_threadsafe(_set_state, destination, source)
+
+ destination.add_done_callback(_call_check_cancel)
+ source.add_done_callback(_call_set_state)
+
+
+def wrap_future(future, *, loop=None):
+ """Wrap concurrent.futures.Future object."""
+ if isfuture(future):
+ return future
+ assert isinstance(future, concurrent.futures.Future), \
+ f'concurrent.futures.Future is expected, got {future!r}'
+ if loop is None:
+ loop = events.get_event_loop()
+ new_future = loop.create_future()
+ _chain_future(future, new_future)
+ return new_future
+
+
+try:
+ import _asyncio
+except ImportError:
+ pass
+else:
+ # _CFuture is needed for tests.
+ Future = _CFuture = _asyncio.Future