unix-cpy: Remove unix-cpy. It's no longer needed.

unix-cpy was originally written to get semantic equivalent with CPython
without writing functional tests.  When writing the initial
implementation of uPy it was a long way between lexer and functional
tests, so the half-way test was to make sure that the bytecode was
correct.  The idea was that if the uPy bytecode matched CPython 1-1 then
uPy would be proper Python if the bytecodes acted correctly.  And having
matching bytecode meant that it was less likely to miss some deep
subtlety in the Python semantics that would require an architectural
change later on.

But that is all history and it no longer makes sense to retain the
ability to output CPython bytecode, because:

1. It outputs CPython 3.3 compatible bytecode.  CPython's bytecode
changes from version to version, and seems to have changed quite a bit
in 3.5.  There's no point in changing the bytecode output to match
CPython anymore.

2. uPy and CPy do different optimisations to the bytecode which makes it
harder to match.

3. The bytecode tests are not run.  They were never part of Travis and
are not run locally anymore.

4. The EMIT_CPYTHON option needs a lot of extra source code which adds
heaps of noise, especially in compile.c.

5. Now that there is an extensive test suite (which tests functionality)
there is no need to match the bytecode.  Some very subtle behaviour is
tested with the test suite and passing these tests is a much better
way to stay Python-language compliant, rather than trying to match
CPy bytecode.

1 files changed, 0 insertions, 232 deletions

diff --git a/tests/bytecode/pylib-tests/shelve.py b/tests/bytecode/pylib-tests/shelve.py
deleted file mode 100644
index 1b9bae1c13..0000000000
--- a/tests/bytecode/pylib-tests/shelve.py
+++ /dev/null
@@ -1,232 +0,0 @@
-"""Manage shelves of pickled objects.
-
-A "shelf" is a persistent, dictionary-like object.  The difference
-with dbm databases is that the values (not the keys!) in a shelf can
-be essentially arbitrary Python objects -- anything that the "pickle"
-module can handle.  This includes most class instances, recursive data
-types, and objects containing lots of shared sub-objects.  The keys
-are ordinary strings.
-
-To summarize the interface (key is a string, data is an arbitrary
-object):
-
-        import shelve
-        d = shelve.open(filename) # open, with (g)dbm filename -- no suffix
-
-        d[key] = data   # store data at key (overwrites old data if
-                        # using an existing key)
-        data = d[key]   # retrieve a COPY of the data at key (raise
-                        # KeyError if no such key) -- NOTE that this
-                        # access returns a *copy* of the entry!
-        del d[key]      # delete data stored at key (raises KeyError
-                        # if no such key)
-        flag = key in d # true if the key exists
-        list = d.keys() # a list of all existing keys (slow!)
-
-        d.close()       # close it
-
-Dependent on the implementation, closing a persistent dictionary may
-or may not be necessary to flush changes to disk.
-
-Normally, d[key] returns a COPY of the entry.  This needs care when
-mutable entries are mutated: for example, if d[key] is a list,
-        d[key].append(anitem)
-does NOT modify the entry d[key] itself, as stored in the persistent
-mapping -- it only modifies the copy, which is then immediately
-discarded, so that the append has NO effect whatsoever.  To append an
-item to d[key] in a way that will affect the persistent mapping, use:
-        data = d[key]
-        data.append(anitem)
-        d[key] = data
-
-To avoid the problem with mutable entries, you may pass the keyword
-argument writeback=True in the call to shelve.open.  When you use:
-        d = shelve.open(filename, writeback=True)
-then d keeps a cache of all entries you access, and writes them all back
-to the persistent mapping when you call d.close().  This ensures that
-such usage as d[key].append(anitem) works as intended.
-
-However, using keyword argument writeback=True may consume vast amount
-of memory for the cache, and it may make d.close() very slow, if you
-access many of d's entries after opening it in this way: d has no way to
-check which of the entries you access are mutable and/or which ones you
-actually mutate, so it must cache, and write back at close, all of the
-entries that you access.  You can call d.sync() to write back all the
-entries in the cache, and empty the cache (d.sync() also synchronizes
-the persistent dictionary on disk, if feasible).
-"""
-
-from pickle import Pickler, Unpickler
-from io import BytesIO
-
-import collections
-
-__all__ = ["Shelf","BsdDbShelf","DbfilenameShelf","open"]
-
-class _ClosedDict(collections.MutableMapping):
-    """Marker for a closed dict.  Access attempts raise a ValueError."""
-
-    def closed(self, *args):
-        raise ValueError('invalid operation on closed shelf')
-    __iter__ = __len__ = __getitem__ = __setitem__ = __delitem__ = keys = closed
-
-    def __repr__(self):
-        return '<Closed Dictionary>'
-
-
-class Shelf(collections.MutableMapping):
-    """Base class for shelf implementations.
-
-    This is initialized with a dictionary-like object.
-    See the module's __doc__ string for an overview of the interface.
-    """
-
-    def __init__(self, dict, protocol=None, writeback=False,
-                 keyencoding="utf-8"):
-        self.dict = dict
-        if protocol is None:
-            protocol = 3
-        self._protocol = protocol
-        self.writeback = writeback
-        self.cache = {}
-        self.keyencoding = keyencoding
-
-    def __iter__(self):
-        for k in self.dict.keys():
-            yield k.decode(self.keyencoding)
-
-    def __len__(self):
-        return len(self.dict)
-
-    def __contains__(self, key):
-        return key.encode(self.keyencoding) in self.dict
-
-    def get(self, key, default=None):
-        if key.encode(self.keyencoding) in self.dict:
-            return self[key]
-        return default
-
-    def __getitem__(self, key):
-        try:
-            value = self.cache[key]
-        except KeyError:
-            f = BytesIO(self.dict[key.encode(self.keyencoding)])
-            value = Unpickler(f).load()
-            if self.writeback:
-                self.cache[key] = value
-        return value
-
-    def __setitem__(self, key, value):
-        if self.writeback:
-            self.cache[key] = value
-        f = BytesIO()
-        p = Pickler(f, self._protocol)
-        p.dump(value)
-        self.dict[key.encode(self.keyencoding)] = f.getvalue()
-
-    def __delitem__(self, key):
-        del self.dict[key.encode(self.keyencoding)]
-        try:
-            del self.cache[key]
-        except KeyError:
-            pass
-
-    def close(self):
-        self.sync()
-        try:
-            self.dict.close()
-        except AttributeError:
-            pass
-        # Catch errors that may happen when close is called from __del__
-        # because CPython is in interpreter shutdown.
-        try:
-            self.dict = _ClosedDict()
-        except (NameError, TypeError):
-            self.dict = None
-
-    def __del__(self):
-        if not hasattr(self, 'writeback'):
-            # __init__ didn't succeed, so don't bother closing
-            return
-        self.close()
-
-    def sync(self):
-        if self.writeback and self.cache:
-            self.writeback = False
-            for key, entry in self.cache.items():
-                self[key] = entry
-            self.writeback = True
-            self.cache = {}
-        if hasattr(self.dict, 'sync'):
-            self.dict.sync()
-
-
-class BsdDbShelf(Shelf):
-    """Shelf implementation using the "BSD" db interface.
-
-    This adds methods first(), next(), previous(), last() and
-    set_location() that have no counterpart in [g]dbm databases.
-
-    The actual database must be opened using one of the "bsddb"
-    modules "open" routines (i.e. bsddb.hashopen, bsddb.btopen or
-    bsddb.rnopen) and passed to the constructor.
-
-    See the module's __doc__ string for an overview of the interface.
-    """
-
-    def __init__(self, dict, protocol=None, writeback=False,
-                 keyencoding="utf-8"):
-        Shelf.__init__(self, dict, protocol, writeback, keyencoding)
-
-    def set_location(self, key):
-        (key, value) = self.dict.set_location(key)
-        f = BytesIO(value)
-        return (key.decode(self.keyencoding), Unpickler(f).load())
-
-    def next(self):
-        (key, value) = next(self.dict)
-        f = BytesIO(value)
-        return (key.decode(self.keyencoding), Unpickler(f).load())
-
-    def previous(self):
-        (key, value) = self.dict.previous()
-        f = BytesIO(value)
-        return (key.decode(self.keyencoding), Unpickler(f).load())
-
-    def first(self):
-        (key, value) = self.dict.first()
-        f = BytesIO(value)
-        return (key.decode(self.keyencoding), Unpickler(f).load())
-
-    def last(self):
-        (key, value) = self.dict.last()
-        f = BytesIO(value)
-        return (key.decode(self.keyencoding), Unpickler(f).load())
-
-
-class DbfilenameShelf(Shelf):
-    """Shelf implementation using the "dbm" generic dbm interface.
-
-    This is initialized with the filename for the dbm database.
-    See the module's __doc__ string for an overview of the interface.
-    """
-
-    def __init__(self, filename, flag='c', protocol=None, writeback=False):
-        import dbm
-        Shelf.__init__(self, dbm.open(filename, flag), protocol, writeback)
-
-
-def open(filename, flag='c', protocol=None, writeback=False):
-    """Open a persistent dictionary for reading and writing.
-
-    The filename parameter is the base filename for the underlying
-    database.  As a side-effect, an extension may be added to the
-    filename and more than one file may be created.  The optional flag
-    parameter has the same interpretation as the flag parameter of
-    dbm.open(). The optional protocol parameter specifies the
-    version of the pickle protocol (0, 1, or 2).
-
-    See the module's __doc__ string for an overview of the interface.
-    """
-
-    return DbfilenameShelf(filename, flag, protocol, writeback)