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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
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