# cython: language_level = 2 # cython: auto_pickle=False # # Code output module # from __future__ import absolute_import import cython cython.declare(os=object, re=object, operator=object, textwrap=object, Template=object, Naming=object, Options=object, StringEncoding=object, Utils=object, SourceDescriptor=object, StringIOTree=object, DebugFlags=object, basestring=object, defaultdict=object, closing=object, partial=object) import os import re import shutil import sys import operator import textwrap from string import Template from functools import partial from contextlib import closing from collections import defaultdict try: import hashlib except ImportError: import md5 as hashlib from . import Naming from . import Options from . import DebugFlags from . import StringEncoding from . import Version from .. import Utils from .Scanning import SourceDescriptor from ..StringIOTree import StringIOTree try: from __builtin__ import basestring except ImportError: from builtins import str as basestring KEYWORDS_MUST_BE_BYTES = sys.version_info < (2, 7) non_portable_builtins_map = { # builtins that have different names in different Python versions 'bytes' : ('PY_MAJOR_VERSION < 3', 'str'), 'unicode' : ('PY_MAJOR_VERSION >= 3', 'str'), 'basestring' : ('PY_MAJOR_VERSION >= 3', 'str'), 'xrange' : ('PY_MAJOR_VERSION >= 3', 'range'), 'raw_input' : ('PY_MAJOR_VERSION >= 3', 'input'), } ctypedef_builtins_map = { # types of builtins in "ctypedef class" statements which we don't # import either because the names conflict with C types or because # the type simply is not exposed. 'py_int' : '&PyInt_Type', 'py_long' : '&PyLong_Type', 'py_float' : '&PyFloat_Type', 'wrapper_descriptor' : '&PyWrapperDescr_Type', } basicsize_builtins_map = { # builtins whose type has a different tp_basicsize than sizeof(...) 'PyTypeObject': 'PyHeapTypeObject', } uncachable_builtins = [ # Global/builtin names that cannot be cached because they may or may not # be available at import time, for various reasons: ## - Py3.7+ 'breakpoint', # might deserve an implementation in Cython ## - Py3.4+ '__loader__', '__spec__', ## - Py3+ 'BlockingIOError', 'BrokenPipeError', 'ChildProcessError', 'ConnectionAbortedError', 'ConnectionError', 'ConnectionRefusedError', 'ConnectionResetError', 'FileExistsError', 'FileNotFoundError', 'InterruptedError', 'IsADirectoryError', 'ModuleNotFoundError', 'NotADirectoryError', 'PermissionError', 'ProcessLookupError', 'RecursionError', 'ResourceWarning', #'StopAsyncIteration', # backported 'TimeoutError', '__build_class__', 'ascii', # might deserve an implementation in Cython #'exec', # implemented in Cython ## - Py2.7+ 'memoryview', ## - platform specific 'WindowsError', ## - others '_', # e.g. used by gettext ] special_py_methods = set([ '__cinit__', '__dealloc__', '__richcmp__', '__next__', '__await__', '__aiter__', '__anext__', '__getreadbuffer__', '__getwritebuffer__', '__getsegcount__', '__getcharbuffer__', '__getbuffer__', '__releasebuffer__' ]) modifier_output_mapper = { 'inline': 'CYTHON_INLINE' }.get class IncludeCode(object): """ An include file and/or verbatim C code to be included in the generated sources. """ # attributes: # # pieces {order: unicode}: pieces of C code to be generated. # For the included file, the key "order" is zero. # For verbatim include code, the "order" is the "order" # attribute of the original IncludeCode where this piece # of C code was first added. This is needed to prevent # duplication if the same include code is found through # multiple cimports. # location int: where to put this include in the C sources, one # of the constants INITIAL, EARLY, LATE # order int: sorting order (automatically set by increasing counter) # Constants for location. If the same include occurs with different # locations, the earliest one takes precedense. INITIAL = 0 EARLY = 1 LATE = 2 counter = 1 # Counter for "order" def __init__(self, include=None, verbatim=None, late=True, initial=False): self.order = self.counter type(self).counter += 1 self.pieces = {} if include: if include[0] == '<' and include[-1] == '>': self.pieces[0] = u'#include {0}'.format(include) late = False # system include is never late else: self.pieces[0] = u'#include "{0}"'.format(include) if verbatim: self.pieces[self.order] = verbatim if initial: self.location = self.INITIAL elif late: self.location = self.LATE else: self.location = self.EARLY def dict_update(self, d, key): """ Insert `self` in dict `d` with key `key`. If that key already exists, update the attributes of the existing value with `self`. """ if key in d: other = d[key] other.location = min(self.location, other.location) other.pieces.update(self.pieces) else: d[key] = self def sortkey(self): return self.order def mainpiece(self): """ Return the main piece of C code, corresponding to the include file. If there was no include file, return None. """ return self.pieces.get(0) def write(self, code): # Write values of self.pieces dict, sorted by the keys for k in sorted(self.pieces): code.putln(self.pieces[k]) def get_utility_dir(): # make this a function and not global variables: # http://trac.cython.org/cython_trac/ticket/475 Cython_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) return os.path.join(Cython_dir, "Utility") class UtilityCodeBase(object): """ Support for loading utility code from a file. Code sections in the file can be specified as follows: ##### MyUtility.proto ##### [proto declarations] ##### MyUtility.init ##### [code run at module initialization] ##### MyUtility ##### #@requires: MyOtherUtility #@substitute: naming [definitions] for prototypes and implementation respectively. For non-python or -cython files backslashes should be used instead. 5 to 30 comment characters may be used on either side. If the @cname decorator is not used and this is a CythonUtilityCode, one should pass in the 'name' keyword argument to be used for name mangling of such entries. """ is_cython_utility = False _utility_cache = {} @classmethod def _add_utility(cls, utility, type, lines, begin_lineno, tags=None): if utility is None: return code = '\n'.join(lines) if tags and 'substitute' in tags and tags['substitute'] == set(['naming']): del tags['substitute'] try: code = Template(code).substitute(vars(Naming)) except (KeyError, ValueError) as e: raise RuntimeError("Error parsing templated utility code of type '%s' at line %d: %s" % ( type, begin_lineno, e)) # remember correct line numbers at least until after templating code = '\n' * begin_lineno + code if type == 'proto': utility[0] = code elif type == 'impl': utility[1] = code else: all_tags = utility[2] if KEYWORDS_MUST_BE_BYTES: type = type.encode('ASCII') all_tags[type] = code if tags: all_tags = utility[2] for name, values in tags.items(): if KEYWORDS_MUST_BE_BYTES: name = name.encode('ASCII') all_tags.setdefault(name, set()).update(values) @classmethod def load_utilities_from_file(cls, path): utilities = cls._utility_cache.get(path) if utilities: return utilities filename = os.path.join(get_utility_dir(), path) _, ext = os.path.splitext(path) if ext in ('.pyx', '.py', '.pxd', '.pxi'): comment = '#' strip_comments = partial(re.compile(r'^\s*#(?!\s*cython\s*:).*').sub, '') rstrip = StringEncoding._unicode.rstrip else: comment = '/' strip_comments = partial(re.compile(r'^\s*//.*|/\*[^*]*\*/').sub, '') rstrip = partial(re.compile(r'\s+(\\?)$').sub, r'\1') match_special = re.compile( (r'^%(C)s{5,30}\s*(?P(?:\w|\.)+)\s*%(C)s{5,30}|' r'^%(C)s+@(?P\w+)\s*:\s*(?P(?:\w|[.:])+)') % {'C': comment}).match match_type = re.compile(r'(.+)[.](proto(?:[.]\S+)?|impl|init|cleanup)$').match with closing(Utils.open_source_file(filename, encoding='UTF-8')) as f: all_lines = f.readlines() utilities = defaultdict(lambda: [None, None, {}]) lines = [] tags = defaultdict(set) utility = type = None begin_lineno = 0 for lineno, line in enumerate(all_lines): m = match_special(line) if m: if m.group('name'): cls._add_utility(utility, type, lines, begin_lineno, tags) begin_lineno = lineno + 1 del lines[:] tags.clear() name = m.group('name') mtype = match_type(name) if mtype: name, type = mtype.groups() else: type = 'impl' utility = utilities[name] else: tags[m.group('tag')].add(m.group('value')) lines.append('') # keep line number correct else: lines.append(rstrip(strip_comments(line))) if utility is None: raise ValueError("Empty utility code file") # Don't forget to add the last utility code cls._add_utility(utility, type, lines, begin_lineno, tags) utilities = dict(utilities) # un-defaultdict-ify cls._utility_cache[path] = utilities return utilities @classmethod def load(cls, util_code_name, from_file=None, **kwargs): """ Load utility code from a file specified by from_file (relative to Cython/Utility) and name util_code_name. If from_file is not given, load it from the file util_code_name.*. There should be only one file matched by this pattern. """ if '::' in util_code_name: from_file, util_code_name = util_code_name.rsplit('::', 1) if not from_file: utility_dir = get_utility_dir() prefix = util_code_name + '.' try: listing = os.listdir(utility_dir) except OSError: # XXX the code below assumes as 'zipimport.zipimporter' instance # XXX should be easy to generalize, but too lazy right now to write it import zipfile global __loader__ loader = __loader__ archive = loader.archive with closing(zipfile.ZipFile(archive)) as fileobj: listing = [os.path.basename(name) for name in fileobj.namelist() if os.path.join(archive, name).startswith(utility_dir)] files = [filename for filename in listing if filename.startswith(prefix)] if not files: raise ValueError("No match found for utility code " + util_code_name) if len(files) > 1: raise ValueError("More than one filename match found for utility code " + util_code_name) from_file = files[0] utilities = cls.load_utilities_from_file(from_file) proto, impl, tags = utilities[util_code_name] if tags: orig_kwargs = kwargs.copy() for name, values in tags.items(): if name in kwargs: continue # only pass lists when we have to: most argument expect one value or None if name == 'requires': if orig_kwargs: values = [cls.load(dep, from_file, **orig_kwargs) for dep in sorted(values)] else: # dependencies are rarely unique, so use load_cached() when we can values = [cls.load_cached(dep, from_file) for dep in sorted(values)] elif not values: values = None elif len(values) == 1: values = list(values)[0] kwargs[name] = values if proto is not None: kwargs['proto'] = proto if impl is not None: kwargs['impl'] = impl if 'name' not in kwargs: kwargs['name'] = util_code_name if 'file' not in kwargs and from_file: kwargs['file'] = from_file return cls(**kwargs) @classmethod def load_cached(cls, utility_code_name, from_file=None, __cache={}): """ Calls .load(), but using a per-type cache based on utility name and file name. """ key = (cls, from_file, utility_code_name) try: return __cache[key] except KeyError: pass code = __cache[key] = cls.load(utility_code_name, from_file) return code @classmethod def load_as_string(cls, util_code_name, from_file=None, **kwargs): """ Load a utility code as a string. Returns (proto, implementation) """ util = cls.load(util_code_name, from_file, **kwargs) proto, impl = util.proto, util.impl return util.format_code(proto), util.format_code(impl) def format_code(self, code_string, replace_empty_lines=re.compile(r'\n\n+').sub): """ Format a code section for output. """ if code_string: code_string = replace_empty_lines('\n', code_string.strip()) + '\n\n' return code_string def __str__(self): return "<%s(%s)>" % (type(self).__name__, self.name) def get_tree(self, **kwargs): pass def __deepcopy__(self, memodict=None): # No need to deep-copy utility code since it's essentially immutable. return self class UtilityCode(UtilityCodeBase): """ Stores utility code to add during code generation. See GlobalState.put_utility_code. hashes/equals by instance proto C prototypes impl implementation code init code to call on module initialization requires utility code dependencies proto_block the place in the resulting file where the prototype should end up name name of the utility code (or None) file filename of the utility code file this utility was loaded from (or None) """ def __init__(self, proto=None, impl=None, init=None, cleanup=None, requires=None, proto_block='utility_code_proto', name=None, file=None): # proto_block: Which code block to dump prototype in. See GlobalState. self.proto = proto self.impl = impl self.init = init self.cleanup = cleanup self.requires = requires self._cache = {} self.specialize_list = [] self.proto_block = proto_block self.name = name self.file = file def __hash__(self): return hash((self.proto, self.impl)) def __eq__(self, other): if self is other: return True self_type, other_type = type(self), type(other) if self_type is not other_type and not (isinstance(other, self_type) or isinstance(self, other_type)): return False self_proto = getattr(self, 'proto', None) other_proto = getattr(other, 'proto', None) return (self_proto, self.impl) == (other_proto, other.impl) def none_or_sub(self, s, context): """ Format a string in this utility code with context. If None, do nothing. """ if s is None: return None return s % context def specialize(self, pyrex_type=None, **data): # Dicts aren't hashable... name = self.name if pyrex_type is not None: data['type'] = pyrex_type.empty_declaration_code() data['type_name'] = pyrex_type.specialization_name() name = "%s[%s]" % (name, data['type_name']) key = tuple(sorted(data.items())) try: return self._cache[key] except KeyError: if self.requires is None: requires = None else: requires = [r.specialize(data) for r in self.requires] s = self._cache[key] = UtilityCode( self.none_or_sub(self.proto, data), self.none_or_sub(self.impl, data), self.none_or_sub(self.init, data), self.none_or_sub(self.cleanup, data), requires, self.proto_block, name, ) self.specialize_list.append(s) return s def inject_string_constants(self, impl, output): """Replace 'PYIDENT("xyz")' by a constant Python identifier cname. """ if 'PYIDENT(' not in impl and 'PYUNICODE(' not in impl: return False, impl replacements = {} def externalise(matchobj): key = matchobj.groups() try: cname = replacements[key] except KeyError: str_type, name = key cname = replacements[key] = output.get_py_string_const( StringEncoding.EncodedString(name), identifier=str_type == 'IDENT').cname return cname impl = re.sub(r'PY(IDENT|UNICODE)\("([^"]+)"\)', externalise, impl) assert 'PYIDENT(' not in impl and 'PYUNICODE(' not in impl return True, impl def inject_unbound_methods(self, impl, output): """Replace 'UNBOUND_METHOD(type, "name")' by a constant Python identifier cname. """ if 'CALL_UNBOUND_METHOD(' not in impl: return False, impl def externalise(matchobj): type_cname, method_name, obj_cname, args = matchobj.groups() args = [arg.strip() for arg in args[1:].split(',')] if args else [] assert len(args) < 3, "CALL_UNBOUND_METHOD() does not support %d call arguments" % len(args) return output.cached_unbound_method_call_code(obj_cname, type_cname, method_name, args) impl = re.sub( r'CALL_UNBOUND_METHOD\(' r'([a-zA-Z_]+),' # type cname r'\s*"([^"]+)",' # method name r'\s*([^),]+)' # object cname r'((?:,\s*[^),]+)*)' # args* r'\)', externalise, impl) assert 'CALL_UNBOUND_METHOD(' not in impl return True, impl def wrap_c_strings(self, impl): """Replace CSTRING('''xyz''') by a C compatible string """ if 'CSTRING(' not in impl: return impl def split_string(matchobj): content = matchobj.group(1).replace('"', '\042') return ''.join( '"%s\\n"\n' % line if not line.endswith('\\') or line.endswith('\\\\') else '"%s"\n' % line[:-1] for line in content.splitlines()) impl = re.sub(r'CSTRING\(\s*"""([^"]*(?:"[^"]+)*)"""\s*\)', split_string, impl) assert 'CSTRING(' not in impl return impl def put_code(self, output): if self.requires: for dependency in self.requires: output.use_utility_code(dependency) if self.proto: writer = output[self.proto_block] writer.putln("/* %s.proto */" % self.name) writer.put_or_include( self.format_code(self.proto), '%s_proto' % self.name) if self.impl: impl = self.format_code(self.wrap_c_strings(self.impl)) is_specialised1, impl = self.inject_string_constants(impl, output) is_specialised2, impl = self.inject_unbound_methods(impl, output) writer = output['utility_code_def'] writer.putln("/* %s */" % self.name) if not (is_specialised1 or is_specialised2): # no module specific adaptations => can be reused writer.put_or_include(impl, '%s_impl' % self.name) else: writer.put(impl) if self.init: writer = output['init_globals'] writer.putln("/* %s.init */" % self.name) if isinstance(self.init, basestring): writer.put(self.format_code(self.init)) else: self.init(writer, output.module_pos) writer.putln(writer.error_goto_if_PyErr(output.module_pos)) writer.putln() if self.cleanup and Options.generate_cleanup_code: writer = output['cleanup_globals'] writer.putln("/* %s.cleanup */" % self.name) if isinstance(self.cleanup, basestring): writer.put_or_include( self.format_code(self.cleanup), '%s_cleanup' % self.name) else: self.cleanup(writer, output.module_pos) def sub_tempita(s, context, file=None, name=None): "Run tempita on string s with given context." if not s: return None if file: context['__name'] = "%s:%s" % (file, name) elif name: context['__name'] = name from ..Tempita import sub return sub(s, **context) class TempitaUtilityCode(UtilityCode): def __init__(self, name=None, proto=None, impl=None, init=None, file=None, context=None, **kwargs): if context is None: context = {} proto = sub_tempita(proto, context, file, name) impl = sub_tempita(impl, context, file, name) init = sub_tempita(init, context, file, name) super(TempitaUtilityCode, self).__init__( proto, impl, init=init, name=name, file=file, **kwargs) @classmethod def load_cached(cls, utility_code_name, from_file=None, context=None, __cache={}): context_key = tuple(sorted(context.items())) if context else None assert hash(context_key) is not None # raise TypeError if not hashable key = (cls, from_file, utility_code_name, context_key) try: return __cache[key] except KeyError: pass code = __cache[key] = cls.load(utility_code_name, from_file, context=context) return code def none_or_sub(self, s, context): """ Format a string in this utility code with context. If None, do nothing. """ if s is None: return None return sub_tempita(s, context, self.file, self.name) class LazyUtilityCode(UtilityCodeBase): """ Utility code that calls a callback with the root code writer when available. Useful when you only have 'env' but not 'code'. """ __name__ = '' requires = None def __init__(self, callback): self.callback = callback def put_code(self, globalstate): utility = self.callback(globalstate.rootwriter) globalstate.use_utility_code(utility) class FunctionState(object): # return_label string function return point label # error_label string error catch point label # continue_label string loop continue point label # break_label string loop break point label # return_from_error_cleanup_label string # label_counter integer counter for naming labels # in_try_finally boolean inside try of try...finally # exc_vars (string * 3) exception variables for reraise, or None # can_trace boolean line tracing is supported in the current context # scope Scope the scope object of the current function # Not used for now, perhaps later def __init__(self, owner, names_taken=set(), scope=None): self.names_taken = names_taken self.owner = owner self.scope = scope self.error_label = None self.label_counter = 0 self.labels_used = set() self.return_label = self.new_label() self.new_error_label() self.continue_label = None self.break_label = None self.yield_labels = [] self.in_try_finally = 0 self.exc_vars = None self.current_except = None self.can_trace = False self.gil_owned = True self.temps_allocated = [] # of (name, type, manage_ref, static) self.temps_free = {} # (type, manage_ref) -> list of free vars with same type/managed status self.temps_used_type = {} # name -> (type, manage_ref) self.zombie_temps = set() # temps that must not be reused after release self.temp_counter = 0 self.closure_temps = None # This is used to collect temporaries, useful to find out which temps # need to be privatized in parallel sections self.collect_temps_stack = [] # This is used for the error indicator, which needs to be local to the # function. It used to be global, which relies on the GIL being held. # However, exceptions may need to be propagated through 'nogil' # sections, in which case we introduce a race condition. self.should_declare_error_indicator = False self.uses_error_indicator = False # safety checks def validate_exit(self): # validate that all allocated temps have been freed if self.temps_allocated: leftovers = self.temps_in_use() if leftovers: msg = "TEMPGUARD: Temps left over at end of '%s': %s" % (self.scope.name, ', '.join([ '%s [%s]' % (name, ctype) for name, ctype, is_pytemp in sorted(leftovers)]), ) #print(msg) raise RuntimeError(msg) # labels def new_label(self, name=None): n = self.label_counter self.label_counter = n + 1 label = "%s%d" % (Naming.label_prefix, n) if name is not None: label += '_' + name return label def new_yield_label(self, expr_type='yield'): label = self.new_label('resume_from_%s' % expr_type) num_and_label = (len(self.yield_labels) + 1, label) self.yield_labels.append(num_and_label) return num_and_label def new_error_label(self): old_err_lbl = self.error_label self.error_label = self.new_label('error') return old_err_lbl def get_loop_labels(self): return ( self.continue_label, self.break_label) def set_loop_labels(self, labels): (self.continue_label, self.break_label) = labels def new_loop_labels(self): old_labels = self.get_loop_labels() self.set_loop_labels( (self.new_label("continue"), self.new_label("break"))) return old_labels def get_all_labels(self): return ( self.continue_label, self.break_label, self.return_label, self.error_label) def set_all_labels(self, labels): (self.continue_label, self.break_label, self.return_label, self.error_label) = labels def all_new_labels(self): old_labels = self.get_all_labels() new_labels = [] for old_label, name in zip(old_labels, ['continue', 'break', 'return', 'error']): if old_label: new_labels.append(self.new_label(name)) else: new_labels.append(old_label) self.set_all_labels(new_labels) return old_labels def use_label(self, lbl): self.labels_used.add(lbl) def label_used(self, lbl): return lbl in self.labels_used # temp handling def allocate_temp(self, type, manage_ref, static=False, reusable=True): """ Allocates a temporary (which may create a new one or get a previously allocated and released one of the same type). Type is simply registered and handed back, but will usually be a PyrexType. If type.is_pyobject, manage_ref comes into play. If manage_ref is set to True, the temp will be decref-ed on return statements and in exception handling clauses. Otherwise the caller has to deal with any reference counting of the variable. If not type.is_pyobject, then manage_ref will be ignored, but it still has to be passed. It is recommended to pass False by convention if it is known that type will never be a Python object. static=True marks the temporary declaration with "static". This is only used when allocating backing store for a module-level C array literals. if reusable=False, the temp will not be reused after release. A C string referring to the variable is returned. """ if type.is_const and not type.is_reference: type = type.const_base_type elif type.is_reference and not type.is_fake_reference: type = type.ref_base_type elif type.is_cfunction: from . import PyrexTypes type = PyrexTypes.c_ptr_type(type) # A function itself isn't an l-value if not type.is_pyobject and not type.is_memoryviewslice: # Make manage_ref canonical, so that manage_ref will always mean # a decref is needed. manage_ref = False freelist = self.temps_free.get((type, manage_ref)) if reusable and freelist is not None and freelist[0]: result = freelist[0].pop() freelist[1].remove(result) else: while True: self.temp_counter += 1 result = "%s%d" % (Naming.codewriter_temp_prefix, self.temp_counter) if result not in self.names_taken: break self.temps_allocated.append((result, type, manage_ref, static)) if not reusable: self.zombie_temps.add(result) self.temps_used_type[result] = (type, manage_ref) if DebugFlags.debug_temp_code_comments: self.owner.putln("/* %s allocated (%s)%s */" % (result, type, "" if reusable else " - zombie")) if self.collect_temps_stack: self.collect_temps_stack[-1].add((result, type)) return result def release_temp(self, name): """ Releases a temporary so that it can be reused by other code needing a temp of the same type. """ type, manage_ref = self.temps_used_type[name] freelist = self.temps_free.get((type, manage_ref)) if freelist is None: freelist = ([], set()) # keep order in list and make lookups in set fast self.temps_free[(type, manage_ref)] = freelist if name in freelist[1]: raise RuntimeError("Temp %s freed twice!" % name) if name not in self.zombie_temps: freelist[0].append(name) freelist[1].add(name) if DebugFlags.debug_temp_code_comments: self.owner.putln("/* %s released %s*/" % ( name, " - zombie" if name in self.zombie_temps else "")) def temps_in_use(self): """Return a list of (cname,type,manage_ref) tuples of temp names and their type that are currently in use. """ used = [] for name, type, manage_ref, static in self.temps_allocated: freelist = self.temps_free.get((type, manage_ref)) if freelist is None or name not in freelist[1]: used.append((name, type, manage_ref and type.is_pyobject)) return used def temps_holding_reference(self): """Return a list of (cname,type) tuples of temp names and their type that are currently in use. This includes only temps of a Python object type which owns its reference. """ return [(name, type) for name, type, manage_ref in self.temps_in_use() if manage_ref and type.is_pyobject] def all_managed_temps(self): """Return a list of (cname, type) tuples of refcount-managed Python objects. """ return [(cname, type) for cname, type, manage_ref, static in self.temps_allocated if manage_ref] def all_free_managed_temps(self): """Return a list of (cname, type) tuples of refcount-managed Python objects that are not currently in use. This is used by try-except and try-finally blocks to clean up temps in the error case. """ return sorted([ # Enforce deterministic order. (cname, type) for (type, manage_ref), freelist in self.temps_free.items() if manage_ref for cname in freelist[0] ]) def start_collecting_temps(self): """ Useful to find out which temps were used in a code block """ self.collect_temps_stack.append(set()) def stop_collecting_temps(self): return self.collect_temps_stack.pop() def init_closure_temps(self, scope): self.closure_temps = ClosureTempAllocator(scope) class NumConst(object): """Global info about a Python number constant held by GlobalState. cname string value string py_type string int, long, float value_code string evaluation code if different from value """ def __init__(self, cname, value, py_type, value_code=None): self.cname = cname self.value = value self.py_type = py_type self.value_code = value_code or value class PyObjectConst(object): """Global info about a generic constant held by GlobalState. """ # cname string # type PyrexType def __init__(self, cname, type): self.cname = cname self.type = type cython.declare(possible_unicode_identifier=object, possible_bytes_identifier=object, replace_identifier=object, find_alphanums=object) possible_unicode_identifier = re.compile(br"(?![0-9])\w+$".decode('ascii'), re.U).match possible_bytes_identifier = re.compile(r"(?![0-9])\w+$".encode('ASCII')).match replace_identifier = re.compile(r'[^a-zA-Z0-9_]+').sub find_alphanums = re.compile('([a-zA-Z0-9]+)').findall class StringConst(object): """Global info about a C string constant held by GlobalState. """ # cname string # text EncodedString or BytesLiteral # py_strings {(identifier, encoding) : PyStringConst} def __init__(self, cname, text, byte_string): self.cname = cname self.text = text self.escaped_value = StringEncoding.escape_byte_string(byte_string) self.py_strings = None self.py_versions = [] def add_py_version(self, version): if not version: self.py_versions = [2, 3] elif version not in self.py_versions: self.py_versions.append(version) def get_py_string_const(self, encoding, identifier=None, is_str=False, py3str_cstring=None): py_strings = self.py_strings text = self.text is_str = bool(identifier or is_str) is_unicode = encoding is None and not is_str if encoding is None: # unicode string encoding_key = None else: # bytes or str encoding = encoding.lower() if encoding in ('utf8', 'utf-8', 'ascii', 'usascii', 'us-ascii'): encoding = None encoding_key = None else: encoding_key = ''.join(find_alphanums(encoding)) key = (is_str, is_unicode, encoding_key, py3str_cstring) if py_strings is not None: try: return py_strings[key] except KeyError: pass else: self.py_strings = {} if identifier: intern = True elif identifier is None: if isinstance(text, bytes): intern = bool(possible_bytes_identifier(text)) else: intern = bool(possible_unicode_identifier(text)) else: intern = False if intern: prefix = Naming.interned_prefixes['str'] else: prefix = Naming.py_const_prefix if encoding_key: encoding_prefix = '_%s' % encoding_key else: encoding_prefix = '' pystring_cname = "%s%s%s_%s" % ( prefix, (is_str and 's') or (is_unicode and 'u') or 'b', encoding_prefix, self.cname[len(Naming.const_prefix):]) py_string = PyStringConst( pystring_cname, encoding, is_unicode, is_str, py3str_cstring, intern) self.py_strings[key] = py_string return py_string class PyStringConst(object): """Global info about a Python string constant held by GlobalState. """ # cname string # py3str_cstring string # encoding string # intern boolean # is_unicode boolean # is_str boolean def __init__(self, cname, encoding, is_unicode, is_str=False, py3str_cstring=None, intern=False): self.cname = cname self.py3str_cstring = py3str_cstring self.encoding = encoding self.is_str = is_str self.is_unicode = is_unicode self.intern = intern def __lt__(self, other): return self.cname < other.cname class GlobalState(object): # filename_table {string : int} for finding filename table indexes # filename_list [string] filenames in filename table order # input_file_contents dict contents (=list of lines) of any file that was used as input # to create this output C code. This is # used to annotate the comments. # # utility_codes set IDs of used utility code (to avoid reinsertion) # # declared_cnames {string:Entry} used in a transition phase to merge pxd-declared # constants etc. into the pyx-declared ones (i.e, # check if constants are already added). # In time, hopefully the literals etc. will be # supplied directly instead. # # const_cnames_used dict global counter for unique constant identifiers # # parts {string:CCodeWriter} # interned_strings # consts # interned_nums # directives set Temporary variable used to track # the current set of directives in the code generation # process. directives = {} code_layout = [ 'h_code', 'filename_table', 'utility_code_proto_before_types', 'numeric_typedefs', # Let these detailed individual parts stay!, 'complex_type_declarations', # as the proper solution is to make a full DAG... 'type_declarations', # More coarse-grained blocks would simply hide 'utility_code_proto', # the ugliness, not fix it 'module_declarations', 'typeinfo', 'before_global_var', 'global_var', 'string_decls', 'decls', 'late_includes', 'all_the_rest', 'pystring_table', 'cached_builtins', 'cached_constants', 'init_globals', 'init_module', 'cleanup_globals', 'cleanup_module', 'main_method', 'utility_code_def', 'end' ] def __init__(self, writer, module_node, code_config, common_utility_include_dir=None): self.filename_table = {} self.filename_list = [] self.input_file_contents = {} self.utility_codes = set() self.declared_cnames = {} self.in_utility_code_generation = False self.code_config = code_config self.common_utility_include_dir = common_utility_include_dir self.parts = {} self.module_node = module_node # because some utility code generation needs it # (generating backwards-compatible Get/ReleaseBuffer self.const_cnames_used = {} self.string_const_index = {} self.dedup_const_index = {} self.pyunicode_ptr_const_index = {} self.num_const_index = {} self.py_constants = [] self.cached_cmethods = {} self.initialised_constants = set() writer.set_global_state(self) self.rootwriter = writer def initialize_main_c_code(self): rootwriter = self.rootwriter for part in self.code_layout: self.parts[part] = rootwriter.insertion_point() if not Options.cache_builtins: del self.parts['cached_builtins'] else: w = self.parts['cached_builtins'] w.enter_cfunc_scope() w.putln("static CYTHON_SMALL_CODE int __Pyx_InitCachedBuiltins(void) {") w = self.parts['cached_constants'] w.enter_cfunc_scope() w.putln("") w.putln("static CYTHON_SMALL_CODE int __Pyx_InitCachedConstants(void) {") w.put_declare_refcount_context() w.put_setup_refcount_context("__Pyx_InitCachedConstants") w = self.parts['init_globals'] w.enter_cfunc_scope() w.putln("") w.putln("static CYTHON_SMALL_CODE int __Pyx_InitGlobals(void) {") if not Options.generate_cleanup_code: del self.parts['cleanup_globals'] else: w = self.parts['cleanup_globals'] w.enter_cfunc_scope() w.putln("") w.putln("static CYTHON_SMALL_CODE void __Pyx_CleanupGlobals(void) {") code = self.parts['utility_code_proto'] code.putln("") code.putln("/* --- Runtime support code (head) --- */") code = self.parts['utility_code_def'] if self.code_config.emit_linenums: code.write('\n#line 1 "cython_utility"\n') code.putln("") code.putln("/* --- Runtime support code --- */") def finalize_main_c_code(self): self.close_global_decls() # # utility_code_def # code = self.parts['utility_code_def'] util = TempitaUtilityCode.load_cached("TypeConversions", "TypeConversion.c") code.put(util.format_code(util.impl)) code.putln("") def __getitem__(self, key): return self.parts[key] # # Global constants, interned objects, etc. # def close_global_decls(self): # This is called when it is known that no more global declarations will # declared. self.generate_const_declarations() if Options.cache_builtins: w = self.parts['cached_builtins'] w.putln("return 0;") if w.label_used(w.error_label): w.put_label(w.error_label) w.putln("return -1;") w.putln("}") w.exit_cfunc_scope() w = self.parts['cached_constants'] w.put_finish_refcount_context() w.putln("return 0;") if w.label_used(w.error_label): w.put_label(w.error_label) w.put_finish_refcount_context() w.putln("return -1;") w.putln("}") w.exit_cfunc_scope() w = self.parts['init_globals'] w.putln("return 0;") if w.label_used(w.error_label): w.put_label(w.error_label) w.putln("return -1;") w.putln("}") w.exit_cfunc_scope() if Options.generate_cleanup_code: w = self.parts['cleanup_globals'] w.putln("}") w.exit_cfunc_scope() if Options.generate_cleanup_code: w = self.parts['cleanup_module'] w.putln("}") w.exit_cfunc_scope() def put_pyobject_decl(self, entry): self['global_var'].putln("static PyObject *%s;" % entry.cname) # constant handling at code generation time def get_cached_constants_writer(self, target=None): if target is not None: if target in self.initialised_constants: # Return None on second/later calls to prevent duplicate creation code. return None self.initialised_constants.add(target) return self.parts['cached_constants'] def get_int_const(self, str_value, longness=False): py_type = longness and 'long' or 'int' try: c = self.num_const_index[(str_value, py_type)] except KeyError: c = self.new_num_const(str_value, py_type) return c def get_float_const(self, str_value, value_code): try: c = self.num_const_index[(str_value, 'float')] except KeyError: c = self.new_num_const(str_value, 'float', value_code) return c def get_py_const(self, type, prefix='', cleanup_level=None, dedup_key=None): if dedup_key is not None: const = self.dedup_const_index.get(dedup_key) if const is not None: return const # create a new Python object constant const = self.new_py_const(type, prefix) if cleanup_level is not None \ and cleanup_level <= Options.generate_cleanup_code: cleanup_writer = self.parts['cleanup_globals'] cleanup_writer.putln('Py_CLEAR(%s);' % const.cname) if dedup_key is not None: self.dedup_const_index[dedup_key] = const return const def get_string_const(self, text, py_version=None): # return a C string constant, creating a new one if necessary if text.is_unicode: byte_string = text.utf8encode() else: byte_string = text.byteencode() try: c = self.string_const_index[byte_string] except KeyError: c = self.new_string_const(text, byte_string) c.add_py_version(py_version) return c def get_pyunicode_ptr_const(self, text): # return a Py_UNICODE[] constant, creating a new one if necessary assert text.is_unicode try: c = self.pyunicode_ptr_const_index[text] except KeyError: c = self.pyunicode_ptr_const_index[text] = self.new_const_cname() return c def get_py_string_const(self, text, identifier=None, is_str=False, unicode_value=None): # return a Python string constant, creating a new one if necessary py3str_cstring = None if is_str and unicode_value is not None \ and unicode_value.utf8encode() != text.byteencode(): py3str_cstring = self.get_string_const(unicode_value, py_version=3) c_string = self.get_string_const(text, py_version=2) else: c_string = self.get_string_const(text) py_string = c_string.get_py_string_const( text.encoding, identifier, is_str, py3str_cstring) return py_string def get_interned_identifier(self, text): return self.get_py_string_const(text, identifier=True) def new_string_const(self, text, byte_string): cname = self.new_string_const_cname(byte_string) c = StringConst(cname, text, byte_string) self.string_const_index[byte_string] = c return c def new_num_const(self, value, py_type, value_code=None): cname = self.new_num_const_cname(value, py_type) c = NumConst(cname, value, py_type, value_code) self.num_const_index[(value, py_type)] = c return c def new_py_const(self, type, prefix=''): cname = self.new_const_cname(prefix) c = PyObjectConst(cname, type) self.py_constants.append(c) return c def new_string_const_cname(self, bytes_value): # Create a new globally-unique nice name for a C string constant. value = bytes_value.decode('ASCII', 'ignore') return self.new_const_cname(value=value) def new_num_const_cname(self, value, py_type): if py_type == 'long': value += 'L' py_type = 'int' prefix = Naming.interned_prefixes[py_type] cname = "%s%s" % (prefix, value) cname = cname.replace('+', '_').replace('-', 'neg_').replace('.', '_') return cname def new_const_cname(self, prefix='', value=''): value = replace_identifier('_', value)[:32].strip('_') used = self.const_cnames_used name_suffix = value while name_suffix in used: counter = used[value] = used[value] + 1 name_suffix = '%s_%d' % (value, counter) used[name_suffix] = 1 if prefix: prefix = Naming.interned_prefixes[prefix] else: prefix = Naming.const_prefix return "%s%s" % (prefix, name_suffix) def get_cached_unbound_method(self, type_cname, method_name): key = (type_cname, method_name) try: cname = self.cached_cmethods[key] except KeyError: cname = self.cached_cmethods[key] = self.new_const_cname( 'umethod', '%s_%s' % (type_cname, method_name)) return cname def cached_unbound_method_call_code(self, obj_cname, type_cname, method_name, arg_cnames): # admittedly, not the best place to put this method, but it is reused by UtilityCode and ExprNodes ... utility_code_name = "CallUnboundCMethod%d" % len(arg_cnames) self.use_utility_code(UtilityCode.load_cached(utility_code_name, "ObjectHandling.c")) cache_cname = self.get_cached_unbound_method(type_cname, method_name) args = [obj_cname] + arg_cnames return "__Pyx_%s(&%s, %s)" % ( utility_code_name, cache_cname, ', '.join(args), ) def add_cached_builtin_decl(self, entry): if entry.is_builtin and entry.is_const: if self.should_declare(entry.cname, entry): self.put_pyobject_decl(entry) w = self.parts['cached_builtins'] condition = None if entry.name in non_portable_builtins_map: condition, replacement = non_portable_builtins_map[entry.name] w.putln('#if %s' % condition) self.put_cached_builtin_init( entry.pos, StringEncoding.EncodedString(replacement), entry.cname) w.putln('#else') self.put_cached_builtin_init( entry.pos, StringEncoding.EncodedString(entry.name), entry.cname) if condition: w.putln('#endif') def put_cached_builtin_init(self, pos, name, cname): w = self.parts['cached_builtins'] interned_cname = self.get_interned_identifier(name).cname self.use_utility_code( UtilityCode.load_cached("GetBuiltinName", "ObjectHandling.c")) w.putln('%s = __Pyx_GetBuiltinName(%s); if (!%s) %s' % ( cname, interned_cname, cname, w.error_goto(pos))) def generate_const_declarations(self): self.generate_cached_methods_decls() self.generate_string_constants() self.generate_num_constants() self.generate_object_constant_decls() def generate_object_constant_decls(self): consts = [(len(c.cname), c.cname, c) for c in self.py_constants] consts.sort() decls_writer = self.parts['decls'] for _, cname, c in consts: decls_writer.putln( "static %s;" % c.type.declaration_code(cname)) def generate_cached_methods_decls(self): if not self.cached_cmethods: return decl = self.parts['decls'] init = self.parts['init_globals'] cnames = [] for (type_cname, method_name), cname in sorted(self.cached_cmethods.items()): cnames.append(cname) method_name_cname = self.get_interned_identifier(StringEncoding.EncodedString(method_name)).cname decl.putln('static __Pyx_CachedCFunction %s = {0, &%s, 0, 0, 0};' % ( cname, method_name_cname)) # split type reference storage as it might not be static init.putln('%s.type = (PyObject*)&%s;' % ( cname, type_cname)) if Options.generate_cleanup_code: cleanup = self.parts['cleanup_globals'] for cname in cnames: cleanup.putln("Py_CLEAR(%s.method);" % cname) def generate_string_constants(self): c_consts = [(len(c.cname), c.cname, c) for c in self.string_const_index.values()] c_consts.sort() py_strings = [] decls_writer = self.parts['string_decls'] for _, cname, c in c_consts: conditional = False if c.py_versions and (2 not in c.py_versions or 3 not in c.py_versions): conditional = True decls_writer.putln("#if PY_MAJOR_VERSION %s 3" % ( (2 in c.py_versions) and '<' or '>=')) decls_writer.putln('static const char %s[] = "%s";' % ( cname, StringEncoding.split_string_literal(c.escaped_value))) if conditional: decls_writer.putln("#endif") if c.py_strings is not None: for py_string in c.py_strings.values(): py_strings.append((c.cname, len(py_string.cname), py_string)) for c, cname in sorted(self.pyunicode_ptr_const_index.items()): utf16_array, utf32_array = StringEncoding.encode_pyunicode_string(c) if utf16_array: # Narrow and wide representations differ decls_writer.putln("#ifdef Py_UNICODE_WIDE") decls_writer.putln("static Py_UNICODE %s[] = { %s };" % (cname, utf32_array)) if utf16_array: decls_writer.putln("#else") decls_writer.putln("static Py_UNICODE %s[] = { %s };" % (cname, utf16_array)) decls_writer.putln("#endif") if py_strings: self.use_utility_code(UtilityCode.load_cached("InitStrings", "StringTools.c")) py_strings.sort() w = self.parts['pystring_table'] w.putln("") w.putln("static __Pyx_StringTabEntry %s[] = {" % Naming.stringtab_cname) for c_cname, _, py_string in py_strings: if not py_string.is_str or not py_string.encoding or \ py_string.encoding in ('ASCII', 'USASCII', 'US-ASCII', 'UTF8', 'UTF-8'): encoding = '0' else: encoding = '"%s"' % py_string.encoding.lower() decls_writer.putln( "static PyObject *%s;" % py_string.cname) if py_string.py3str_cstring: w.putln("#if PY_MAJOR_VERSION >= 3") w.putln("{&%s, %s, sizeof(%s), %s, %d, %d, %d}," % ( py_string.cname, py_string.py3str_cstring.cname, py_string.py3str_cstring.cname, '0', 1, 0, py_string.intern )) w.putln("#else") w.putln("{&%s, %s, sizeof(%s), %s, %d, %d, %d}," % ( py_string.cname, c_cname, c_cname, encoding, py_string.is_unicode, py_string.is_str, py_string.intern )) if py_string.py3str_cstring: w.putln("#endif") w.putln("{0, 0, 0, 0, 0, 0, 0}") w.putln("};") init_globals = self.parts['init_globals'] init_globals.putln( "if (__Pyx_InitStrings(%s) < 0) %s" % ( Naming.stringtab_cname, init_globals.error_goto(self.module_pos))) def generate_num_constants(self): consts = [(c.py_type, c.value[0] == '-', len(c.value), c.value, c.value_code, c) for c in self.num_const_index.values()] consts.sort() decls_writer = self.parts['decls'] init_globals = self.parts['init_globals'] for py_type, _, _, value, value_code, c in consts: cname = c.cname decls_writer.putln("static PyObject *%s;" % cname) if py_type == 'float': function = 'PyFloat_FromDouble(%s)' elif py_type == 'long': function = 'PyLong_FromString((char *)"%s", 0, 0)' elif Utils.long_literal(value): function = 'PyInt_FromString((char *)"%s", 0, 0)' elif len(value.lstrip('-')) > 4: function = "PyInt_FromLong(%sL)" else: function = "PyInt_FromLong(%s)" init_globals.putln('%s = %s; %s' % ( cname, function % value_code, init_globals.error_goto_if_null(cname, self.module_pos))) # The functions below are there in a transition phase only # and will be deprecated. They are called from Nodes.BlockNode. # The copy&paste duplication is intentional in order to be able # to see quickly how BlockNode worked, until this is replaced. def should_declare(self, cname, entry): if cname in self.declared_cnames: other = self.declared_cnames[cname] assert str(entry.type) == str(other.type) assert entry.init == other.init return False else: self.declared_cnames[cname] = entry return True # # File name state # def lookup_filename(self, source_desc): entry = source_desc.get_filenametable_entry() try: index = self.filename_table[entry] except KeyError: index = len(self.filename_list) self.filename_list.append(source_desc) self.filename_table[entry] = index return index def commented_file_contents(self, source_desc): try: return self.input_file_contents[source_desc] except KeyError: pass source_file = source_desc.get_lines(encoding='ASCII', error_handling='ignore') try: F = [u' * ' + line.rstrip().replace( u'*/', u'*[inserted by cython to avoid comment closer]/' ).replace( u'/*', u'/[inserted by cython to avoid comment start]*' ) for line in source_file] finally: if hasattr(source_file, 'close'): source_file.close() if not F: F.append(u'') self.input_file_contents[source_desc] = F return F # # Utility code state # def use_utility_code(self, utility_code): """ Adds code to the C file. utility_code should a) implement __eq__/__hash__ for the purpose of knowing whether the same code has already been included b) implement put_code, which takes a globalstate instance See UtilityCode. """ if utility_code and utility_code not in self.utility_codes: self.utility_codes.add(utility_code) utility_code.put_code(self) def use_entry_utility_code(self, entry): if entry is None: return if entry.utility_code: self.use_utility_code(entry.utility_code) if entry.utility_code_definition: self.use_utility_code(entry.utility_code_definition) def funccontext_property(func): name = func.__name__ attribute_of = operator.attrgetter(name) def get(self): return attribute_of(self.funcstate) def set(self, value): setattr(self.funcstate, name, value) return property(get, set) class CCodeConfig(object): # emit_linenums boolean write #line pragmas? # emit_code_comments boolean copy the original code into C comments? # c_line_in_traceback boolean append the c file and line number to the traceback for exceptions? def __init__(self, emit_linenums=True, emit_code_comments=True, c_line_in_traceback=True): self.emit_code_comments = emit_code_comments self.emit_linenums = emit_linenums self.c_line_in_traceback = c_line_in_traceback class CCodeWriter(object): """ Utility class to output C code. When creating an insertion point one must care about the state that is kept: - formatting state (level, bol) is cloned and used in insertion points as well - labels, temps, exc_vars: One must construct a scope in which these can exist by calling enter_cfunc_scope/exit_cfunc_scope (these are for sanity checking and forward compatibility). Created insertion points looses this scope and cannot access it. - marker: Not copied to insertion point - filename_table, filename_list, input_file_contents: All codewriters coming from the same root share the same instances simultaneously. """ # f file output file # buffer StringIOTree # level int indentation level # bol bool beginning of line? # marker string comment to emit before next line # funcstate FunctionState contains state local to a C function used for code # generation (labels and temps state etc.) # globalstate GlobalState contains state global for a C file (input file info, # utility code, declared constants etc.) # pyclass_stack list used during recursive code generation to pass information # about the current class one is in # code_config CCodeConfig configuration options for the C code writer @cython.locals(create_from='CCodeWriter') def __init__(self, create_from=None, buffer=None, copy_formatting=False): if buffer is None: buffer = StringIOTree() self.buffer = buffer self.last_pos = None self.last_marked_pos = None self.pyclass_stack = [] self.funcstate = None self.globalstate = None self.code_config = None self.level = 0 self.call_level = 0 self.bol = 1 if create_from is not None: # Use same global state self.set_global_state(create_from.globalstate) self.funcstate = create_from.funcstate # Clone formatting state if copy_formatting: self.level = create_from.level self.bol = create_from.bol self.call_level = create_from.call_level self.last_pos = create_from.last_pos self.last_marked_pos = create_from.last_marked_pos def create_new(self, create_from, buffer, copy_formatting): # polymorphic constructor -- very slightly more versatile # than using __class__ result = CCodeWriter(create_from, buffer, copy_formatting) return result def set_global_state(self, global_state): assert self.globalstate is None # prevent overwriting once it's set self.globalstate = global_state self.code_config = global_state.code_config def copyto(self, f): self.buffer.copyto(f) def getvalue(self): return self.buffer.getvalue() def write(self, s): # also put invalid markers (lineno 0), to indicate that those lines # have no Cython source code correspondence cython_lineno = self.last_marked_pos[1] if self.last_marked_pos else 0 self.buffer.markers.extend([cython_lineno] * s.count('\n')) self.buffer.write(s) def insertion_point(self): other = self.create_new(create_from=self, buffer=self.buffer.insertion_point(), copy_formatting=True) return other def new_writer(self): """ Creates a new CCodeWriter connected to the same global state, which can later be inserted using insert. """ return CCodeWriter(create_from=self) def insert(self, writer): """ Inserts the contents of another code writer (created with the same global state) in the current location. It is ok to write to the inserted writer also after insertion. """ assert writer.globalstate is self.globalstate self.buffer.insert(writer.buffer) # Properties delegated to function scope @funccontext_property def label_counter(self): pass @funccontext_property def return_label(self): pass @funccontext_property def error_label(self): pass @funccontext_property def labels_used(self): pass @funccontext_property def continue_label(self): pass @funccontext_property def break_label(self): pass @funccontext_property def return_from_error_cleanup_label(self): pass @funccontext_property def yield_labels(self): pass # Functions delegated to function scope def new_label(self, name=None): return self.funcstate.new_label(name) def new_error_label(self): return self.funcstate.new_error_label() def new_yield_label(self, *args): return self.funcstate.new_yield_label(*args) def get_loop_labels(self): return self.funcstate.get_loop_labels() def set_loop_labels(self, labels): return self.funcstate.set_loop_labels(labels) def new_loop_labels(self): return self.funcstate.new_loop_labels() def get_all_labels(self): return self.funcstate.get_all_labels() def set_all_labels(self, labels): return self.funcstate.set_all_labels(labels) def all_new_labels(self): return self.funcstate.all_new_labels() def use_label(self, lbl): return self.funcstate.use_label(lbl) def label_used(self, lbl): return self.funcstate.label_used(lbl) def enter_cfunc_scope(self, scope=None): self.funcstate = FunctionState(self, scope=scope) def exit_cfunc_scope(self): self.funcstate = None # constant handling def get_py_int(self, str_value, longness): return self.globalstate.get_int_const(str_value, longness).cname def get_py_float(self, str_value, value_code): return self.globalstate.get_float_const(str_value, value_code).cname def get_py_const(self, type, prefix='', cleanup_level=None, dedup_key=None): return self.globalstate.get_py_const(type, prefix, cleanup_level, dedup_key).cname def get_string_const(self, text): return self.globalstate.get_string_const(text).cname def get_pyunicode_ptr_const(self, text): return self.globalstate.get_pyunicode_ptr_const(text) def get_py_string_const(self, text, identifier=None, is_str=False, unicode_value=None): return self.globalstate.get_py_string_const( text, identifier, is_str, unicode_value).cname def get_argument_default_const(self, type): return self.globalstate.get_py_const(type).cname def intern(self, text): return self.get_py_string_const(text) def intern_identifier(self, text): return self.get_py_string_const(text, identifier=True) def get_cached_constants_writer(self, target=None): return self.globalstate.get_cached_constants_writer(target) # code generation def putln(self, code="", safe=False): if self.last_pos and self.bol: self.emit_marker() if self.code_config.emit_linenums and self.last_marked_pos: source_desc, line, _ = self.last_marked_pos self.write('\n#line %s "%s"\n' % (line, source_desc.get_escaped_description())) if code: if safe: self.put_safe(code) else: self.put(code) self.write("\n") self.bol = 1 def mark_pos(self, pos, trace=True): if pos is None: return if self.last_marked_pos and self.last_marked_pos[:2] == pos[:2]: return self.last_pos = (pos, trace) def emit_marker(self): pos, trace = self.last_pos self.last_marked_pos = pos self.last_pos = None self.write("\n") if self.code_config.emit_code_comments: self.indent() self.write("/* %s */\n" % self._build_marker(pos)) if trace and self.funcstate and self.funcstate.can_trace and self.globalstate.directives['linetrace']: self.indent() self.write('__Pyx_TraceLine(%d,%d,%s)\n' % ( pos[1], not self.funcstate.gil_owned, self.error_goto(pos))) def _build_marker(self, pos): source_desc, line, col = pos assert isinstance(source_desc, SourceDescriptor) contents = self.globalstate.commented_file_contents(source_desc) lines = contents[max(0, line-3):line] # line numbers start at 1 lines[-1] += u' # <<<<<<<<<<<<<<' lines += contents[line:line+2] return u'"%s":%d\n%s\n' % (source_desc.get_escaped_description(), line, u'\n'.join(lines)) def put_safe(self, code): # put code, but ignore {} self.write(code) self.bol = 0 def put_or_include(self, code, name): include_dir = self.globalstate.common_utility_include_dir if include_dir and len(code) > 1024: include_file = "%s_%s.h" % ( name, hashlib.md5(code.encode('utf8')).hexdigest()) path = os.path.join(include_dir, include_file) if not os.path.exists(path): tmp_path = '%s.tmp%s' % (path, os.getpid()) with closing(Utils.open_new_file(tmp_path)) as f: f.write(code) shutil.move(tmp_path, path) code = '#include "%s"\n' % path self.put(code) def put(self, code): fix_indent = False if "{" in code: dl = code.count("{") else: dl = 0 if "}" in code: dl -= code.count("}") if dl < 0: self.level += dl elif dl == 0 and code[0] == "}": # special cases like "} else {" need a temporary dedent fix_indent = True self.level -= 1 if self.bol: self.indent() self.write(code) self.bol = 0 if dl > 0: self.level += dl elif fix_indent: self.level += 1 def putln_tempita(self, code, **context): from ..Tempita import sub self.putln(sub(code, **context)) def put_tempita(self, code, **context): from ..Tempita import sub self.put(sub(code, **context)) def increase_indent(self): self.level += 1 def decrease_indent(self): self.level -= 1 def begin_block(self): self.putln("{") self.increase_indent() def end_block(self): self.decrease_indent() self.putln("}") def indent(self): self.write(" " * self.level) def get_py_version_hex(self, pyversion): return "0x%02X%02X%02X%02X" % (tuple(pyversion) + (0,0,0,0))[:4] def put_label(self, lbl): if lbl in self.funcstate.labels_used: self.putln("%s:;" % lbl) def put_goto(self, lbl): self.funcstate.use_label(lbl) self.putln("goto %s;" % lbl) def put_var_declaration(self, entry, storage_class="", dll_linkage=None, definition=True): #print "Code.put_var_declaration:", entry.name, "definition =", definition ### if entry.visibility == 'private' and not (definition or entry.defined_in_pxd): #print "...private and not definition, skipping", entry.cname ### return if entry.visibility == "private" and not entry.used: #print "...private and not used, skipping", entry.cname ### return if storage_class: self.put("%s " % storage_class) if not entry.cf_used: self.put('CYTHON_UNUSED ') self.put(entry.type.declaration_code( entry.cname, dll_linkage=dll_linkage)) if entry.init is not None: self.put_safe(" = %s" % entry.type.literal_code(entry.init)) elif entry.type.is_pyobject: self.put(" = NULL") self.putln(";") def put_temp_declarations(self, func_context): for name, type, manage_ref, static in func_context.temps_allocated: decl = type.declaration_code(name) if type.is_pyobject: self.putln("%s = NULL;" % decl) elif type.is_memoryviewslice: from . import MemoryView self.putln("%s = %s;" % (decl, MemoryView.memslice_entry_init)) else: self.putln("%s%s;" % (static and "static " or "", decl)) if func_context.should_declare_error_indicator: if self.funcstate.uses_error_indicator: unused = '' else: unused = 'CYTHON_UNUSED ' # Initialize these variables to silence compiler warnings self.putln("%sint %s = 0;" % (unused, Naming.lineno_cname)) self.putln("%sconst char *%s = NULL;" % (unused, Naming.filename_cname)) self.putln("%sint %s = 0;" % (unused, Naming.clineno_cname)) def put_generated_by(self): self.putln("/* Generated by Cython %s */" % Version.watermark) self.putln("") def put_h_guard(self, guard): self.putln("#ifndef %s" % guard) self.putln("#define %s" % guard) def unlikely(self, cond): if Options.gcc_branch_hints: return 'unlikely(%s)' % cond else: return cond def build_function_modifiers(self, modifiers, mapper=modifier_output_mapper): if not modifiers: return '' return '%s ' % ' '.join([mapper(m,m) for m in modifiers]) # Python objects and reference counting def entry_as_pyobject(self, entry): type = entry.type if (not entry.is_self_arg and not entry.type.is_complete() or entry.type.is_extension_type): return "(PyObject *)" + entry.cname else: return entry.cname def as_pyobject(self, cname, type): from .PyrexTypes import py_object_type, typecast return typecast(py_object_type, type, cname) def put_gotref(self, cname): self.putln("__Pyx_GOTREF(%s);" % cname) def put_giveref(self, cname): self.putln("__Pyx_GIVEREF(%s);" % cname) def put_xgiveref(self, cname): self.putln("__Pyx_XGIVEREF(%s);" % cname) def put_xgotref(self, cname): self.putln("__Pyx_XGOTREF(%s);" % cname) def put_incref(self, cname, type, nanny=True): if nanny: self.putln("__Pyx_INCREF(%s);" % self.as_pyobject(cname, type)) else: self.putln("Py_INCREF(%s);" % self.as_pyobject(cname, type)) def put_decref(self, cname, type, nanny=True): self._put_decref(cname, type, nanny, null_check=False, clear=False) def put_var_gotref(self, entry): if entry.type.is_pyobject: self.putln("__Pyx_GOTREF(%s);" % self.entry_as_pyobject(entry)) def put_var_giveref(self, entry): if entry.type.is_pyobject: self.putln("__Pyx_GIVEREF(%s);" % self.entry_as_pyobject(entry)) def put_var_xgotref(self, entry): if entry.type.is_pyobject: self.putln("__Pyx_XGOTREF(%s);" % self.entry_as_pyobject(entry)) def put_var_xgiveref(self, entry): if entry.type.is_pyobject: self.putln("__Pyx_XGIVEREF(%s);" % self.entry_as_pyobject(entry)) def put_var_incref(self, entry, nanny=True): if entry.type.is_pyobject: if nanny: self.putln("__Pyx_INCREF(%s);" % self.entry_as_pyobject(entry)) else: self.putln("Py_INCREF(%s);" % self.entry_as_pyobject(entry)) def put_var_xincref(self, entry): if entry.type.is_pyobject: self.putln("__Pyx_XINCREF(%s);" % self.entry_as_pyobject(entry)) def put_decref_clear(self, cname, type, nanny=True, clear_before_decref=False): self._put_decref(cname, type, nanny, null_check=False, clear=True, clear_before_decref=clear_before_decref) def put_xdecref(self, cname, type, nanny=True, have_gil=True): self._put_decref(cname, type, nanny, null_check=True, have_gil=have_gil, clear=False) def put_xdecref_clear(self, cname, type, nanny=True, clear_before_decref=False): self._put_decref(cname, type, nanny, null_check=True, clear=True, clear_before_decref=clear_before_decref) def _put_decref(self, cname, type, nanny=True, null_check=False, have_gil=True, clear=False, clear_before_decref=False): if type.is_memoryviewslice: self.put_xdecref_memoryviewslice(cname, have_gil=have_gil) return prefix = '__Pyx' if nanny else 'Py' X = 'X' if null_check else '' if clear: if clear_before_decref: if not nanny: X = '' # CPython doesn't have a Py_XCLEAR() self.putln("%s_%sCLEAR(%s);" % (prefix, X, cname)) else: self.putln("%s_%sDECREF(%s); %s = 0;" % ( prefix, X, self.as_pyobject(cname, type), cname)) else: self.putln("%s_%sDECREF(%s);" % ( prefix, X, self.as_pyobject(cname, type))) def put_decref_set(self, cname, rhs_cname): self.putln("__Pyx_DECREF_SET(%s, %s);" % (cname, rhs_cname)) def put_xdecref_set(self, cname, rhs_cname): self.putln("__Pyx_XDECREF_SET(%s, %s);" % (cname, rhs_cname)) def put_var_decref(self, entry): if entry.type.is_pyobject: self.putln("__Pyx_XDECREF(%s);" % self.entry_as_pyobject(entry)) def put_var_xdecref(self, entry, nanny=True): if entry.type.is_pyobject: if nanny: self.putln("__Pyx_XDECREF(%s);" % self.entry_as_pyobject(entry)) else: self.putln("Py_XDECREF(%s);" % self.entry_as_pyobject(entry)) def put_var_decref_clear(self, entry): self._put_var_decref_clear(entry, null_check=False) def put_var_xdecref_clear(self, entry): self._put_var_decref_clear(entry, null_check=True) def _put_var_decref_clear(self, entry, null_check): if entry.type.is_pyobject: if entry.in_closure: # reset before DECREF to make sure closure state is # consistent during call to DECREF() self.putln("__Pyx_%sCLEAR(%s);" % ( null_check and 'X' or '', entry.cname)) else: self.putln("__Pyx_%sDECREF(%s); %s = 0;" % ( null_check and 'X' or '', self.entry_as_pyobject(entry), entry.cname)) def put_var_decrefs(self, entries, used_only = 0): for entry in entries: if not used_only or entry.used: if entry.xdecref_cleanup: self.put_var_xdecref(entry) else: self.put_var_decref(entry) def put_var_xdecrefs(self, entries): for entry in entries: self.put_var_xdecref(entry) def put_var_xdecrefs_clear(self, entries): for entry in entries: self.put_var_xdecref_clear(entry) def put_incref_memoryviewslice(self, slice_cname, have_gil=False): from . import MemoryView self.globalstate.use_utility_code(MemoryView.memviewslice_init_code) self.putln("__PYX_INC_MEMVIEW(&%s, %d);" % (slice_cname, int(have_gil))) def put_xdecref_memoryviewslice(self, slice_cname, have_gil=False): from . import MemoryView self.globalstate.use_utility_code(MemoryView.memviewslice_init_code) self.putln("__PYX_XDEC_MEMVIEW(&%s, %d);" % (slice_cname, int(have_gil))) def put_xgiveref_memoryviewslice(self, slice_cname): self.put_xgiveref("%s.memview" % slice_cname) def put_init_to_py_none(self, cname, type, nanny=True): from .PyrexTypes import py_object_type, typecast py_none = typecast(type, py_object_type, "Py_None") if nanny: self.putln("%s = %s; __Pyx_INCREF(Py_None);" % (cname, py_none)) else: self.putln("%s = %s; Py_INCREF(Py_None);" % (cname, py_none)) def put_init_var_to_py_none(self, entry, template = "%s", nanny=True): code = template % entry.cname #if entry.type.is_extension_type: # code = "((PyObject*)%s)" % code self.put_init_to_py_none(code, entry.type, nanny) if entry.in_closure: self.put_giveref('Py_None') def put_pymethoddef(self, entry, term, allow_skip=True, wrapper_code_writer=None): if entry.is_special or entry.name == '__getattribute__': if entry.name not in special_py_methods: if entry.name == '__getattr__' and not self.globalstate.directives['fast_getattr']: pass # Python's typeobject.c will automatically fill in our slot # in add_operators() (called by PyType_Ready) with a value # that's better than ours. elif allow_skip: return method_flags = entry.signature.method_flags() if not method_flags: return from . import TypeSlots if entry.is_special or TypeSlots.is_reverse_number_slot(entry.name): method_flags += [TypeSlots.method_coexist] func_ptr = wrapper_code_writer.put_pymethoddef_wrapper(entry) if wrapper_code_writer else entry.func_cname # Add required casts, but try not to shadow real warnings. cast = '__Pyx_PyCFunctionFast' if 'METH_FASTCALL' in method_flags else 'PyCFunction' if 'METH_KEYWORDS' in method_flags: cast += 'WithKeywords' if cast != 'PyCFunction': func_ptr = '(void*)(%s)%s' % (cast, func_ptr) self.putln( '{"%s", (PyCFunction)%s, %s, %s}%s' % ( entry.name, func_ptr, "|".join(method_flags), entry.doc_cname if entry.doc else '0', term)) def put_pymethoddef_wrapper(self, entry): func_cname = entry.func_cname if entry.is_special: method_flags = entry.signature.method_flags() if method_flags and 'METH_NOARGS' in method_flags: # Special NOARGS methods really take no arguments besides 'self', but PyCFunction expects one. func_cname = Naming.method_wrapper_prefix + func_cname self.putln("static PyObject *%s(PyObject *self, CYTHON_UNUSED PyObject *arg) {return %s(self);}" % ( func_cname, entry.func_cname)) return func_cname # GIL methods def put_ensure_gil(self, declare_gilstate=True, variable=None): """ Acquire the GIL. The generated code is safe even when no PyThreadState has been allocated for this thread (for threads not initialized by using the Python API). Additionally, the code generated by this method may be called recursively. """ self.globalstate.use_utility_code( UtilityCode.load_cached("ForceInitThreads", "ModuleSetupCode.c")) if self.globalstate.directives['fast_gil']: self.globalstate.use_utility_code(UtilityCode.load_cached("FastGil", "ModuleSetupCode.c")) else: self.globalstate.use_utility_code(UtilityCode.load_cached("NoFastGil", "ModuleSetupCode.c")) self.putln("#ifdef WITH_THREAD") if not variable: variable = '__pyx_gilstate_save' if declare_gilstate: self.put("PyGILState_STATE ") self.putln("%s = __Pyx_PyGILState_Ensure();" % variable) self.putln("#endif") def put_release_ensured_gil(self, variable=None): """ Releases the GIL, corresponds to `put_ensure_gil`. """ if self.globalstate.directives['fast_gil']: self.globalstate.use_utility_code(UtilityCode.load_cached("FastGil", "ModuleSetupCode.c")) else: self.globalstate.use_utility_code(UtilityCode.load_cached("NoFastGil", "ModuleSetupCode.c")) if not variable: variable = '__pyx_gilstate_save' self.putln("#ifdef WITH_THREAD") self.putln("__Pyx_PyGILState_Release(%s);" % variable) self.putln("#endif") def put_acquire_gil(self, variable=None): """ Acquire the GIL. The thread's thread state must have been initialized by a previous `put_release_gil` """ if self.globalstate.directives['fast_gil']: self.globalstate.use_utility_code(UtilityCode.load_cached("FastGil", "ModuleSetupCode.c")) else: self.globalstate.use_utility_code(UtilityCode.load_cached("NoFastGil", "ModuleSetupCode.c")) self.putln("#ifdef WITH_THREAD") self.putln("__Pyx_FastGIL_Forget();") if variable: self.putln('_save = %s;' % variable) self.putln("Py_BLOCK_THREADS") self.putln("#endif") def put_release_gil(self, variable=None): "Release the GIL, corresponds to `put_acquire_gil`." if self.globalstate.directives['fast_gil']: self.globalstate.use_utility_code(UtilityCode.load_cached("FastGil", "ModuleSetupCode.c")) else: self.globalstate.use_utility_code(UtilityCode.load_cached("NoFastGil", "ModuleSetupCode.c")) self.putln("#ifdef WITH_THREAD") self.putln("PyThreadState *_save;") self.putln("Py_UNBLOCK_THREADS") if variable: self.putln('%s = _save;' % variable) self.putln("__Pyx_FastGIL_Remember();") self.putln("#endif") def declare_gilstate(self): self.putln("#ifdef WITH_THREAD") self.putln("PyGILState_STATE __pyx_gilstate_save;") self.putln("#endif") # error handling def put_error_if_neg(self, pos, value): # TODO this path is almost _never_ taken, yet this macro makes is slower! # return self.putln("if (unlikely(%s < 0)) %s" % (value, self.error_goto(pos))) return self.putln("if (%s < 0) %s" % (value, self.error_goto(pos))) def put_error_if_unbound(self, pos, entry, in_nogil_context=False): from . import ExprNodes if entry.from_closure: func = '__Pyx_RaiseClosureNameError' self.globalstate.use_utility_code( ExprNodes.raise_closure_name_error_utility_code) elif entry.type.is_memoryviewslice and in_nogil_context: func = '__Pyx_RaiseUnboundMemoryviewSliceNogil' self.globalstate.use_utility_code( ExprNodes.raise_unbound_memoryview_utility_code_nogil) else: func = '__Pyx_RaiseUnboundLocalError' self.globalstate.use_utility_code( ExprNodes.raise_unbound_local_error_utility_code) self.putln('if (unlikely(!%s)) { %s("%s"); %s }' % ( entry.type.check_for_null_code(entry.cname), func, entry.name, self.error_goto(pos))) def set_error_info(self, pos, used=False): self.funcstate.should_declare_error_indicator = True if used: self.funcstate.uses_error_indicator = True return "__PYX_MARK_ERR_POS(%s, %s)" % ( self.lookup_filename(pos[0]), pos[1]) def error_goto(self, pos, used=True): lbl = self.funcstate.error_label self.funcstate.use_label(lbl) if pos is None: return 'goto %s;' % lbl self.funcstate.should_declare_error_indicator = True if used: self.funcstate.uses_error_indicator = True return "__PYX_ERR(%s, %s, %s)" % ( self.lookup_filename(pos[0]), pos[1], lbl) def error_goto_if(self, cond, pos): return "if (%s) %s" % (self.unlikely(cond), self.error_goto(pos)) def error_goto_if_null(self, cname, pos): return self.error_goto_if("!%s" % cname, pos) def error_goto_if_neg(self, cname, pos): return self.error_goto_if("%s < 0" % cname, pos) def error_goto_if_PyErr(self, pos): return self.error_goto_if("PyErr_Occurred()", pos) def lookup_filename(self, filename): return self.globalstate.lookup_filename(filename) def put_declare_refcount_context(self): self.putln('__Pyx_RefNannyDeclarations') def put_setup_refcount_context(self, name, acquire_gil=False): if acquire_gil: self.globalstate.use_utility_code( UtilityCode.load_cached("ForceInitThreads", "ModuleSetupCode.c")) self.putln('__Pyx_RefNannySetupContext("%s", %d);' % (name, acquire_gil and 1 or 0)) def put_finish_refcount_context(self): self.putln("__Pyx_RefNannyFinishContext();") def put_add_traceback(self, qualified_name, include_cline=True): """ Build a Python traceback for propagating exceptions. qualified_name should be the qualified name of the function. """ format_tuple = ( qualified_name, Naming.clineno_cname if include_cline else 0, Naming.lineno_cname, Naming.filename_cname, ) self.funcstate.uses_error_indicator = True self.putln('__Pyx_AddTraceback("%s", %s, %s, %s);' % format_tuple) def put_unraisable(self, qualified_name, nogil=False): """ Generate code to print a Python warning for an unraisable exception. qualified_name should be the qualified name of the function. """ format_tuple = ( qualified_name, Naming.clineno_cname, Naming.lineno_cname, Naming.filename_cname, self.globalstate.directives['unraisable_tracebacks'], nogil, ) self.funcstate.uses_error_indicator = True self.putln('__Pyx_WriteUnraisable("%s", %s, %s, %s, %d, %d);' % format_tuple) self.globalstate.use_utility_code( UtilityCode.load_cached("WriteUnraisableException", "Exceptions.c")) def put_trace_declarations(self): self.putln('__Pyx_TraceDeclarations') def put_trace_frame_init(self, codeobj=None): if codeobj: self.putln('__Pyx_TraceFrameInit(%s)' % codeobj) def put_trace_call(self, name, pos, nogil=False): self.putln('__Pyx_TraceCall("%s", %s[%s], %s, %d, %s);' % ( name, Naming.filetable_cname, self.lookup_filename(pos[0]), pos[1], nogil, self.error_goto(pos))) def put_trace_exception(self): self.putln("__Pyx_TraceException();") def put_trace_return(self, retvalue_cname, nogil=False): self.putln("__Pyx_TraceReturn(%s, %d);" % (retvalue_cname, nogil)) def putln_openmp(self, string): self.putln("#ifdef _OPENMP") self.putln(string) self.putln("#endif /* _OPENMP */") def undef_builtin_expect(self, cond): """ Redefine the macros likely() and unlikely to no-ops, depending on condition 'cond' """ self.putln("#if %s" % cond) self.putln(" #undef likely") self.putln(" #undef unlikely") self.putln(" #define likely(x) (x)") self.putln(" #define unlikely(x) (x)") self.putln("#endif") def redef_builtin_expect(self, cond): self.putln("#if %s" % cond) self.putln(" #undef likely") self.putln(" #undef unlikely") self.putln(" #define likely(x) __builtin_expect(!!(x), 1)") self.putln(" #define unlikely(x) __builtin_expect(!!(x), 0)") self.putln("#endif") class PyrexCodeWriter(object): # f file output file # level int indentation level def __init__(self, outfile_name): self.f = Utils.open_new_file(outfile_name) self.level = 0 def putln(self, code): self.f.write("%s%s\n" % (" " * self.level, code)) def indent(self): self.level += 1 def dedent(self): self.level -= 1 class PyxCodeWriter(object): """ Can be used for writing out some Cython code. To use the indenter functionality, the Cython.Compiler.Importer module will have to be used to load the code to support python 2.4 """ def __init__(self, buffer=None, indent_level=0, context=None, encoding='ascii'): self.buffer = buffer or StringIOTree() self.level = indent_level self.context = context self.encoding = encoding def indent(self, levels=1): self.level += levels return True def dedent(self, levels=1): self.level -= levels def indenter(self, line): """ Instead of with pyx_code.indenter("for i in range(10):"): pyx_code.putln("print i") write if pyx_code.indenter("for i in range(10);"): pyx_code.putln("print i") pyx_code.dedent() """ self.putln(line) self.indent() return True def getvalue(self): result = self.buffer.getvalue() if isinstance(result, bytes): result = result.decode(self.encoding) return result def putln(self, line, context=None): context = context or self.context if context: line = sub_tempita(line, context) self._putln(line) def _putln(self, line): self.buffer.write("%s%s\n" % (self.level * " ", line)) def put_chunk(self, chunk, context=None): context = context or self.context if context: chunk = sub_tempita(chunk, context) chunk = textwrap.dedent(chunk) for line in chunk.splitlines(): self._putln(line) def insertion_point(self): return PyxCodeWriter(self.buffer.insertion_point(), self.level, self.context) def named_insertion_point(self, name): setattr(self, name, self.insertion_point()) class ClosureTempAllocator(object): def __init__(self, klass): self.klass = klass self.temps_allocated = {} self.temps_free = {} self.temps_count = 0 def reset(self): for type, cnames in self.temps_allocated.items(): self.temps_free[type] = list(cnames) def allocate_temp(self, type): if type not in self.temps_allocated: self.temps_allocated[type] = [] self.temps_free[type] = [] elif self.temps_free[type]: return self.temps_free[type].pop(0) cname = '%s%d' % (Naming.codewriter_temp_prefix, self.temps_count) self.klass.declare_var(pos=None, name=cname, cname=cname, type=type, is_cdef=True) self.temps_allocated[type].append(cname) self.temps_count += 1 return cname