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""" Inlining inline functions body. """
from pythran.analyses import Inlinable, Aliases
from pythran.passmanager import Transformation
import gast as ast
import copy
class Inlining(Transformation):
"""
Inline one line functions.
>>> import gast as ast
>>> from pythran import passmanager, backend
>>> pm = passmanager.PassManager("test")
>>> node = ast.parse('''
... def foo(a, b):
... return b + b * a
... def bar(b):
... return foo(2 * b, b) * foo(b, b)''')
>>> _, node = pm.apply(Inlining, node)
>>> print(pm.dump(backend.Python, node))
def foo(a, b):
return (b + (b * a))
def bar(b):
__pythran_inlinefooa0 = (2 * b)
__pythran_inlinefoob0 = b
__pythran_inlinefooa1 = b
__pythran_inlinefoob1 = b
return ((__pythran_inlinefoob0 + (__pythran_inlinefoob0 * \
__pythran_inlinefooa0)) * (__pythran_inlinefoob1 + \
(__pythran_inlinefoob1 * __pythran_inlinefooa1)))
"""
def __init__(self):
""" fun : Function {name :body} for inlinable functions. """
self.update = False
self.defs = list()
self.call_count = 0
super(Inlining, self).__init__(Inlinable, Aliases)
def visit_Stmt(self, node):
""" Add new variable definition before the Statement. """
save_defs, self.defs = self.defs or list(), list()
self.generic_visit(node)
new_defs, self.defs = self.defs, save_defs
return new_defs + [node]
visit_Return = visit_Stmt
visit_Assign = visit_Stmt
visit_AugAssign = visit_Stmt
visit_Print = visit_Stmt
visit_For = visit_Stmt
visit_While = visit_Stmt
visit_If = visit_Stmt
visit_With = visit_Stmt
visit_Assert = visit_Stmt
visit_Expr = visit_Stmt
def visit_Call(self, node):
"""
Replace function call by inlined function's body.
We can inline if it aliases on only one function.
"""
func_aliases = self.aliases[node.func]
if len(func_aliases) == 1:
function_def = next(iter(func_aliases))
if (isinstance(function_def, ast.FunctionDef) and
function_def.name in self.inlinable):
self.update = True
to_inline = copy.deepcopy(self.inlinable[function_def.name])
arg_to_value = dict()
values = node.args
values += to_inline.args.defaults[len(node.args) -
len(to_inline.args.args):]
for arg_fun, arg_call in zip(to_inline.args.args, values):
v_name = "__pythran_inline{}{}{}".format(function_def.name,
arg_fun.id,
self.call_count)
new_var = ast.Name(id=v_name,
ctx=ast.Store(),
annotation=None, type_comment=None)
self.defs.append(ast.Assign(targets=[new_var],
value=arg_call,
type_comment=None))
arg_to_value[arg_fun.id] = ast.Name(id=v_name,
ctx=ast.Load(),
annotation=None,
type_comment=None)
self.call_count += 1
return Inliner(arg_to_value).visit(to_inline.body[0])
return node
class Inliner(ast.NodeTransformer):
""" Helper transform that performed inlined body transformation. """
def __init__(self, match):
""" match : {original_variable_name : Arguments use on call}. """
self.match = match
super(Inliner, self).__init__()
def visit_Name(self, node):
""" Transform name from match values if available. """
return self.match.get(node.id, node)
def visit_Return(self, node):
""" Remove return keyword after inline. """
return self.visit(node.value)
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