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BUG: sparse.linalg: add re-entrancy checks to fortran-based solvers (#…
…1426) The iterative REVCOM solvers use SAVE variables, and are therefore not re-entrant. Add checks to catch if someone tries to call them nested, since in those cases the solvers may produce garbage as output.
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| ########################## LICENCE ############################### | ||
| ## | ||
| ## Copyright (c) 2005-2011, Michele Simionato | ||
| ## All rights reserved. | ||
| ## | ||
| ## Redistributions of source code must retain the above copyright | ||
| ## notice, this list of conditions and the following disclaimer. | ||
| ## Redistributions in bytecode form must reproduce the above copyright | ||
| ## notice, this list of conditions and the following disclaimer in | ||
| ## the documentation and/or other materials provided with the | ||
| ## distribution. | ||
|
|
||
| ## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| ## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| ## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| ## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| ## HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| ## INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| ## BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | ||
| ## OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | ||
| ## ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR | ||
| ## TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE | ||
| ## USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | ||
| ## DAMAGE. | ||
|
|
||
| """ | ||
| Decorator module, see http://pypi.python.org/pypi/decorator | ||
| for the documentation. | ||
| """ | ||
|
|
||
| __version__ = '3.3.2' | ||
|
|
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| __all__ = ["decorator", "FunctionMaker", "partial"] | ||
|
|
||
| import sys, re, inspect | ||
|
|
||
| try: | ||
| from functools import partial | ||
| except ImportError: # for Python version < 2.5 | ||
| class partial(object): | ||
| "A simple replacement of functools.partial" | ||
| def __init__(self, func, *args, **kw): | ||
| self.func = func | ||
| self.args = args | ||
| self.keywords = kw | ||
| def __call__(self, *otherargs, **otherkw): | ||
| kw = self.keywords.copy() | ||
| kw.update(otherkw) | ||
| return self.func(*(self.args + otherargs), **kw) | ||
|
|
||
| if sys.version >= '3': | ||
| from inspect import getfullargspec | ||
| else: | ||
| class getfullargspec(object): | ||
| "A quick and dirty replacement for getfullargspec for Python 2.X" | ||
| def __init__(self, f): | ||
| self.args, self.varargs, self.varkw, self.defaults = \ | ||
| inspect.getargspec(f) | ||
| self.kwonlyargs = [] | ||
| self.kwonlydefaults = None | ||
| self.annotations = getattr(f, '__annotations__', {}) | ||
| def __iter__(self): | ||
| yield self.args | ||
| yield self.varargs | ||
| yield self.varkw | ||
| yield self.defaults | ||
|
|
||
| DEF = re.compile('\s*def\s*([_\w][_\w\d]*)\s*\(') | ||
|
|
||
| # basic functionality | ||
| class FunctionMaker(object): | ||
| """ | ||
| An object with the ability to create functions with a given signature. | ||
| It has attributes name, doc, module, signature, defaults, dict and | ||
| methods update and make. | ||
| """ | ||
| def __init__(self, func=None, name=None, signature=None, | ||
| defaults=None, doc=None, module=None, funcdict=None): | ||
| self.shortsignature = signature | ||
| if func: | ||
| # func can be a class or a callable, but not an instance method | ||
| self.name = func.__name__ | ||
| if self.name == '<lambda>': # small hack for lambda functions | ||
| self.name = '_lambda_' | ||
| self.doc = func.__doc__ | ||
| self.module = func.__module__ | ||
| if inspect.isfunction(func): | ||
| argspec = getfullargspec(func) | ||
| for a in ('args', 'varargs', 'varkw', 'defaults', 'kwonlyargs', | ||
| 'kwonlydefaults', 'annotations'): | ||
| setattr(self, a, getattr(argspec, a)) | ||
| for i, arg in enumerate(self.args): | ||
| setattr(self, 'arg%d' % i, arg) | ||
| self.signature = inspect.formatargspec( | ||
| formatvalue=lambda val: "", *argspec)[1:-1] | ||
| allargs = list(self.args) | ||
| if self.varargs: | ||
| allargs.append('*' + self.varargs) | ||
| if self.varkw: | ||
| allargs.append('**' + self.varkw) | ||
| try: | ||
| self.shortsignature = ', '.join(allargs) | ||
| except TypeError: # exotic signature, valid only in Python 2.X | ||
| self.shortsignature = self.signature | ||
| self.dict = func.__dict__.copy() | ||
| # func=None happens when decorating a caller | ||
| if name: | ||
| self.name = name | ||
| if signature is not None: | ||
| self.signature = signature | ||
| if defaults: | ||
| self.defaults = defaults | ||
| if doc: | ||
| self.doc = doc | ||
| if module: | ||
| self.module = module | ||
| if funcdict: | ||
| self.dict = funcdict | ||
| # check existence required attributes | ||
| assert hasattr(self, 'name') | ||
| if not hasattr(self, 'signature'): | ||
| raise TypeError('You are decorating a non function: %s' % func) | ||
|
|
||
| def update(self, func, **kw): | ||
| "Update the signature of func with the data in self" | ||
| func.__name__ = self.name | ||
| func.__doc__ = getattr(self, 'doc', None) | ||
| func.__dict__ = getattr(self, 'dict', {}) | ||
| func.func_defaults = getattr(self, 'defaults', ()) | ||
| func.__kwdefaults__ = getattr(self, 'kwonlydefaults', None) | ||
| callermodule = sys._getframe(3).f_globals.get('__name__', '?') | ||
| func.__module__ = getattr(self, 'module', callermodule) | ||
| func.__dict__.update(kw) | ||
|
|
||
| def make(self, src_templ, evaldict=None, addsource=False, **attrs): | ||
| "Make a new function from a given template and update the signature" | ||
| src = src_templ % vars(self) # expand name and signature | ||
| evaldict = evaldict or {} | ||
| mo = DEF.match(src) | ||
| if mo is None: | ||
| raise SyntaxError('not a valid function template\n%s' % src) | ||
| name = mo.group(1) # extract the function name | ||
| names = set([name] + [arg.strip(' *') for arg in | ||
| self.shortsignature.split(',')]) | ||
| for n in names: | ||
| if n in ('_func_', '_call_'): | ||
| raise NameError('%s is overridden in\n%s' % (n, src)) | ||
| if not src.endswith('\n'): # add a newline just for safety | ||
| src += '\n' # this is needed in old versions of Python | ||
| try: | ||
| code = compile(src, '<string>', 'single') | ||
| # print >> sys.stderr, 'Compiling %s' % src | ||
| exec code in evaldict | ||
| except: | ||
| print >> sys.stderr, 'Error in generated code:' | ||
| print >> sys.stderr, src | ||
| raise | ||
| func = evaldict[name] | ||
| if addsource: | ||
| attrs['__source__'] = src | ||
| self.update(func, **attrs) | ||
| return func | ||
|
|
||
| @classmethod | ||
| def create(cls, obj, body, evaldict, defaults=None, | ||
| doc=None, module=None, addsource=True, **attrs): | ||
| """ | ||
| Create a function from the strings name, signature and body. | ||
| evaldict is the evaluation dictionary. If addsource is true an attribute | ||
| __source__ is added to the result. The attributes attrs are added, | ||
| if any. | ||
| """ | ||
| if isinstance(obj, str): # "name(signature)" | ||
| name, rest = obj.strip().split('(', 1) | ||
| signature = rest[:-1] #strip a right parens | ||
| func = None | ||
| else: # a function | ||
| name = None | ||
| signature = None | ||
| func = obj | ||
| self = cls(func, name, signature, defaults, doc, module) | ||
| ibody = '\n'.join(' ' + line for line in body.splitlines()) | ||
| return self.make('def %(name)s(%(signature)s):\n' + ibody, | ||
| evaldict, addsource, **attrs) | ||
|
|
||
| def decorator(caller, func=None): | ||
| """ | ||
| decorator(caller) converts a caller function into a decorator; | ||
| decorator(caller, func) decorates a function using a caller. | ||
| """ | ||
| if func is not None: # returns a decorated function | ||
| evaldict = func.func_globals.copy() | ||
| evaldict['_call_'] = caller | ||
| evaldict['_func_'] = func | ||
| return FunctionMaker.create( | ||
| func, "return _call_(_func_, %(shortsignature)s)", | ||
| evaldict, undecorated=func, __wrapped__=func) | ||
| else: # returns a decorator | ||
| if isinstance(caller, partial): | ||
| return partial(decorator, caller) | ||
| # otherwise assume caller is a function | ||
| first = inspect.getargspec(caller)[0][0] # first arg | ||
| evaldict = caller.func_globals.copy() | ||
| evaldict['_call_'] = caller | ||
| evaldict['decorator'] = decorator | ||
| return FunctionMaker.create( | ||
| '%s(%s)' % (caller.__name__, first), | ||
| 'return decorator(_call_, %s)' % first, | ||
| evaldict, undecorated=caller, __wrapped__=caller, | ||
| doc=caller.__doc__, module=caller.__module__) |
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