文件操作 - remove_dead_functions.py

文件: /usr/lib/python3/dist-packages/pythran/optimizations/remove_dead_functions.py

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""" DeadCodeElimination remove useless code. """

from pythran.analyses import DefUseChains
from pythran.passmanager import Transformation
import pythran.metadata as metadata

class RemoveDeadFunctions(Transformation):
    """
    Remove useless local functions

>>> import gast as ast
    >>> from pythran import passmanager, backend, metadata
    >>> pm = passmanager.PassManager("test")
    >>> node = ast.parse("def foo(): return 1")
    >>> _, node = pm.apply(RemoveDeadFunctions, node)
    >>> print(pm.dump(backend.Python, node))
    def foo():
        return 1
    >>> node = ast.parse("def foo(): return 1")
    >>> metadata.add(node.body[0], metadata.Local())
    >>> _, node = pm.apply(RemoveDeadFunctions, node)
    >>> print(pm.dump(backend.Python, node))
    <BLANKLINE>
    """

def __init__(self):
        super(RemoveDeadFunctions, self).__init__(DefUseChains)

def visit_FunctionDef(self, node):
        if metadata.get(node, metadata.Local):
            if not self.def_use_chains.chains[node].users():
                self.update = True
                return None

return node

文件操作 - remove_dead_functions.py

文件: /usr/lib/python3/dist-packages/pythran/optimizations/remove_dead_functions.py

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