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Optimize.py
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Optimize.py
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import re
import copy
import codecs
import itertools
from . import TypeSlots
from .ExprNodes import not_a_constant
import cython
cython.declare(UtilityCode=object, EncodedString=object, bytes_literal=object, encoded_string=object,
Nodes=object, ExprNodes=object, PyrexTypes=object, Builtin=object,
UtilNodes=object, _py_int_types=object)
_py_string_types = (bytes, str)
from . import Nodes
from . import ExprNodes
from . import PyrexTypes
from . import Visitor
from . import Builtin
from . import UtilNodes
from . import Options
from .Code import UtilityCode, TempitaUtilityCode
from .StringEncoding import EncodedString, bytes_literal, encoded_string
from .Errors import error, warning
from .ParseTreeTransforms import SkipDeclarations
from .. import Utils
from functools import reduce
def load_c_utility(name):
return UtilityCode.load_cached(name, "Optimize.c")
def unwrap_coerced_node(node, coercion_nodes=(ExprNodes.CoerceToPyTypeNode, ExprNodes.CoerceFromPyTypeNode)):
if isinstance(node, coercion_nodes):
return node.arg
return node
def unwrap_node(node):
while isinstance(node, UtilNodes.ResultRefNode):
node = node.expression
return node
def is_common_value(a, b):
a = unwrap_node(a)
b = unwrap_node(b)
if isinstance(a, ExprNodes.NameNode) and isinstance(b, ExprNodes.NameNode):
return a.name == b.name
if isinstance(a, ExprNodes.AttributeNode) and isinstance(b, ExprNodes.AttributeNode):
return not a.is_py_attr and is_common_value(a.obj, b.obj) and a.attribute == b.attribute
return False
def filter_none_node(node):
if node is not None and node.constant_result is None:
return None
return node
class _YieldNodeCollector(Visitor.TreeVisitor):
"""
YieldExprNode finder for generator expressions.
"""
def __init__(self):
Visitor.TreeVisitor.__init__(self)
self.yield_stat_nodes = {}
self.yield_nodes = []
visit_Node = Visitor.TreeVisitor.visitchildren
def visit_YieldExprNode(self, node):
self.yield_nodes.append(node)
self.visitchildren(node)
def visit_ExprStatNode(self, node):
self.visitchildren(node)
if node.expr in self.yield_nodes:
self.yield_stat_nodes[node.expr] = node
# everything below these nodes is out of scope:
def visit_GeneratorExpressionNode(self, node):
pass
def visit_LambdaNode(self, node):
pass
def visit_FuncDefNode(self, node):
pass
def _find_single_yield_expression(node):
yield_statements = _find_yield_statements(node)
if len(yield_statements) != 1:
return None, None
return yield_statements[0]
def _find_yield_statements(node):
collector = _YieldNodeCollector()
collector.visitchildren(node)
try:
yield_statements = [
(yield_node.arg, collector.yield_stat_nodes[yield_node])
for yield_node in collector.yield_nodes
]
except KeyError:
# found YieldExprNode without ExprStatNode (i.e. a non-statement usage of 'yield')
yield_statements = []
return yield_statements
class IterationTransform(Visitor.EnvTransform):
"""Transform some common for-in loop patterns into efficient C loops:
- for-in-dict loop becomes a while loop calling PyDict_Next()
- for-in-enumerate is replaced by an external counter variable
- for-in-range loop becomes a plain C for loop
"""
def visit_PrimaryCmpNode(self, node):
if node.is_ptr_contains():
# for t in operand2:
# if operand1 == t:
# res = True
# break
# else:
# res = False
pos = node.pos
result_ref = UtilNodes.ResultRefNode(node)
if node.operand2.is_subscript:
base_type = node.operand2.base.type.base_type
else:
base_type = node.operand2.type.base_type
target_handle = UtilNodes.TempHandle(base_type)
target = target_handle.ref(pos)
cmp_node = ExprNodes.PrimaryCmpNode(
pos, operator='==', operand1=node.operand1, operand2=target)
if_body = Nodes.StatListNode(
pos,
stats = [Nodes.SingleAssignmentNode(pos, lhs=result_ref, rhs=ExprNodes.BoolNode(pos, value=1)),
Nodes.BreakStatNode(pos)])
if_node = Nodes.IfStatNode(
pos,
if_clauses=[Nodes.IfClauseNode(pos, condition=cmp_node, body=if_body)],
else_clause=None)
for_loop = UtilNodes.TempsBlockNode(
pos,
temps = [target_handle],
body = Nodes.ForInStatNode(
pos,
target=target,
iterator=ExprNodes.IteratorNode(node.operand2.pos, sequence=node.operand2),
body=if_node,
else_clause=Nodes.SingleAssignmentNode(pos, lhs=result_ref, rhs=ExprNodes.BoolNode(pos, value=0))))
for_loop = for_loop.analyse_expressions(self.current_env())
for_loop = self.visit(for_loop)
new_node = UtilNodes.TempResultFromStatNode(result_ref, for_loop)
if node.operator == 'not_in':
new_node = ExprNodes.NotNode(pos, operand=new_node)
return new_node
else:
self.visitchildren(node)
return node
def visit_ForInStatNode(self, node):
self.visitchildren(node)
return self._optimise_for_loop(node, node.iterator.sequence)
def _optimise_for_loop(self, node, iterable, reversed=False):
annotation_type = None
if (iterable.is_name or iterable.is_attribute) and iterable.entry and iterable.entry.annotation:
annotation = iterable.entry.annotation.expr
if annotation.is_subscript:
annotation = annotation.base # container base type
if Builtin.dict_type in (iterable.type, annotation_type):
# like iterating over dict.keys()
if reversed:
# CPython raises an error here: not a sequence
return node
return self._transform_dict_iteration(
node, dict_obj=iterable, method=None, keys=True, values=False)
if (Builtin.set_type in (iterable.type, annotation_type) or
Builtin.frozenset_type in (iterable.type, annotation_type)):
if reversed:
# CPython raises an error here: not a sequence
return node
return self._transform_set_iteration(node, iterable)
# C array (slice) iteration?
if iterable.type.is_ptr or iterable.type.is_array:
return self._transform_carray_iteration(node, iterable, reversed=reversed)
if iterable.type is Builtin.bytes_type:
return self._transform_bytes_iteration(node, iterable, reversed=reversed)
if iterable.type is Builtin.unicode_type:
return self._transform_unicode_iteration(node, iterable, reversed=reversed)
# in principle _transform_indexable_iteration would work on most of the above, and
# also tuple and list. However, it probably isn't quite as optimized
if iterable.type is Builtin.bytearray_type:
return self._transform_indexable_iteration(node, iterable, is_mutable=True, reversed=reversed)
if isinstance(iterable, ExprNodes.CoerceToPyTypeNode) and iterable.arg.type.is_memoryviewslice:
return self._transform_indexable_iteration(node, iterable.arg, is_mutable=False, reversed=reversed)
# the rest is based on function calls
if not isinstance(iterable, ExprNodes.SimpleCallNode):
return node
if iterable.args is None:
arg_count = iterable.arg_tuple and len(iterable.arg_tuple.args) or 0
else:
arg_count = len(iterable.args)
if arg_count and iterable.self is not None:
arg_count -= 1
function = iterable.function
# dict iteration?
if function.is_attribute and not reversed and not arg_count:
base_obj = iterable.self or function.obj
method = function.attribute
# in Py3, items() is equivalent to Py2's iteritems()
is_safe_iter = self.global_scope().context.language_level >= 3
if not is_safe_iter and method in ('keys', 'values', 'items'):
# try to reduce this to the corresponding .iter*() methods
if isinstance(base_obj, ExprNodes.CallNode):
inner_function = base_obj.function
if (inner_function.is_name and inner_function.name == 'dict'
and inner_function.entry
and inner_function.entry.is_builtin):
# e.g. dict(something).items() => safe to use .iter*()
is_safe_iter = True
keys = values = False
if method == 'iterkeys' or (is_safe_iter and method == 'keys'):
keys = True
elif method == 'itervalues' or (is_safe_iter and method == 'values'):
values = True
elif method == 'iteritems' or (is_safe_iter and method == 'items'):
keys = values = True
if keys or values:
return self._transform_dict_iteration(
node, base_obj, method, keys, values)
# enumerate/reversed ?
if iterable.self is None and function.is_name and \
function.entry and function.entry.is_builtin:
if function.name == 'enumerate':
if reversed:
# CPython raises an error here: not a sequence
return node
return self._transform_enumerate_iteration(node, iterable)
elif function.name == 'reversed':
if reversed:
# CPython raises an error here: not a sequence
return node
return self._transform_reversed_iteration(node, iterable)
# range() iteration?
if Options.convert_range and 1 <= arg_count <= 3 and (
iterable.self is None and
function.is_name and function.name in ('range', 'xrange') and
function.entry and function.entry.is_builtin):
if node.target.type.is_int or node.target.type.is_enum:
return self._transform_range_iteration(node, iterable, reversed=reversed)
if node.target.type.is_pyobject:
# Assume that small integer ranges (C long >= 32bit) are best handled in C as well.
for arg in (iterable.arg_tuple.args if iterable.args is None else iterable.args):
if isinstance(arg, ExprNodes.IntNode):
if arg.has_constant_result() and -2**30 <= arg.constant_result < 2**30:
continue
break
else:
return self._transform_range_iteration(node, iterable, reversed=reversed)
return node
def _transform_reversed_iteration(self, node, reversed_function):
args = reversed_function.arg_tuple.args
if len(args) == 0:
error(reversed_function.pos,
"reversed() requires an iterable argument")
return node
elif len(args) > 1:
error(reversed_function.pos,
"reversed() takes exactly 1 argument")
return node
arg = args[0]
# reversed(list/tuple) ?
if arg.type in (Builtin.tuple_type, Builtin.list_type):
node.iterator.sequence = arg.as_none_safe_node("'NoneType' object is not iterable")
node.iterator.reversed = True
return node
return self._optimise_for_loop(node, arg, reversed=True)
def _transform_indexable_iteration(self, node, slice_node, is_mutable, reversed=False):
"""In principle can handle any iterable that Cython has a len() for and knows how to index"""
unpack_temp_node = UtilNodes.LetRefNode(
slice_node.as_none_safe_node("'NoneType' is not iterable"),
may_hold_none=False, is_temp=True
)
start_node = ExprNodes.IntNode(
node.pos, value='0', constant_result=0, type=PyrexTypes.c_py_ssize_t_type)
def make_length_call():
# helper function since we need to create this node for a couple of places
builtin_len = ExprNodes.NameNode(node.pos, name="len",
entry=Builtin.builtin_scope.lookup("len"))
return ExprNodes.SimpleCallNode(node.pos,
function=builtin_len,
args=[unpack_temp_node]
)
length_temp = UtilNodes.LetRefNode(make_length_call(), type=PyrexTypes.c_py_ssize_t_type, is_temp=True)
end_node = length_temp
if reversed:
relation1, relation2 = '>', '>='
start_node, end_node = end_node, start_node
else:
relation1, relation2 = '<=', '<'
counter_ref = UtilNodes.LetRefNode(pos=node.pos, type=PyrexTypes.c_py_ssize_t_type)
target_value = ExprNodes.IndexNode(slice_node.pos, base=unpack_temp_node,
index=counter_ref)
target_assign = Nodes.SingleAssignmentNode(
pos = node.target.pos,
lhs = node.target,
rhs = target_value)
# analyse with boundscheck and wraparound
# off (because we're confident we know the size)
env = self.current_env()
new_directives = Options.copy_inherited_directives(env.directives, boundscheck=False, wraparound=False)
target_assign = Nodes.CompilerDirectivesNode(
target_assign.pos,
directives=new_directives,
body=target_assign,
)
body = Nodes.StatListNode(
node.pos,
stats = [target_assign]) # exclude node.body for now to not reanalyse it
if is_mutable:
# We need to be slightly careful here that we are actually modifying the loop
# bounds and not a temp copy of it. Setting is_temp=True on length_temp seems
# to ensure this.
# If this starts to fail then we could insert an "if out_of_bounds: break" instead
loop_length_reassign = Nodes.SingleAssignmentNode(node.pos,
lhs = length_temp,
rhs = make_length_call())
body.stats.append(loop_length_reassign)
loop_node = Nodes.ForFromStatNode(
node.pos,
bound1=start_node, relation1=relation1,
target=counter_ref,
relation2=relation2, bound2=end_node,
step=None, body=body,
else_clause=node.else_clause,
from_range=True)
ret = UtilNodes.LetNode(
unpack_temp_node,
UtilNodes.LetNode(
length_temp,
# TempResultFromStatNode provides the framework where the "counter_ref"
# temp is set up and can be assigned to. However, we don't need the
# result it returns so wrap it in an ExprStatNode.
Nodes.ExprStatNode(node.pos,
expr=UtilNodes.TempResultFromStatNode(
counter_ref,
loop_node
)
)
)
).analyse_expressions(env)
body.stats.insert(1, node.body)
return ret
PyBytes_AS_STRING_func_type = PyrexTypes.CFuncType(
PyrexTypes.c_char_ptr_type, [
PyrexTypes.CFuncTypeArg("s", Builtin.bytes_type, None)
], exception_value="NULL")
PyBytes_GET_SIZE_func_type = PyrexTypes.CFuncType(
PyrexTypes.c_py_ssize_t_type, [
PyrexTypes.CFuncTypeArg("s", Builtin.bytes_type, None)
], exception_value="-1")
def _transform_bytes_iteration(self, node, slice_node, reversed=False):
target_type = node.target.type
if not target_type.is_int and target_type is not Builtin.bytes_type:
# bytes iteration returns bytes objects in Py2, but
# integers in Py3
return node
unpack_temp_node = UtilNodes.LetRefNode(
slice_node.as_none_safe_node("'NoneType' is not iterable"))
slice_base_node = ExprNodes.PythonCapiCallNode(
slice_node.pos, "__Pyx_PyBytes_AsWritableString",
self.PyBytes_AS_STRING_func_type,
args = [unpack_temp_node],
is_temp = 1,
# TypeConversions utility code is always included
)
len_node = ExprNodes.PythonCapiCallNode(
slice_node.pos, "__Pyx_PyBytes_GET_SIZE",
self.PyBytes_GET_SIZE_func_type,
args = [unpack_temp_node],
is_temp = 1,
)
return UtilNodes.LetNode(
unpack_temp_node,
self._transform_carray_iteration(
node,
ExprNodes.SliceIndexNode(
slice_node.pos,
base = slice_base_node,
start = None,
step = None,
stop = len_node,
type = slice_base_node.type,
is_temp = 1,
),
reversed = reversed))
PyUnicode_READ_func_type = PyrexTypes.CFuncType(
PyrexTypes.c_py_ucs4_type, [
PyrexTypes.CFuncTypeArg("kind", PyrexTypes.c_int_type, None),
PyrexTypes.CFuncTypeArg("data", PyrexTypes.c_void_ptr_type, None),
PyrexTypes.CFuncTypeArg("index", PyrexTypes.c_py_ssize_t_type, None)
])
init_unicode_iteration_func_type = PyrexTypes.CFuncType(
PyrexTypes.c_int_type, [
PyrexTypes.CFuncTypeArg("s", PyrexTypes.py_object_type, None),
PyrexTypes.CFuncTypeArg("length", PyrexTypes.c_py_ssize_t_ptr_type, None),
PyrexTypes.CFuncTypeArg("data", PyrexTypes.c_void_ptr_ptr_type, None),
PyrexTypes.CFuncTypeArg("kind", PyrexTypes.c_int_ptr_type, None)
],
exception_value = '-1')
def _transform_unicode_iteration(self, node, slice_node, reversed=False):
if slice_node.is_literal:
# try to reduce to byte iteration for plain Latin-1 strings
try:
bytes_value = bytes_literal(slice_node.value.encode('latin1'), 'iso8859-1')
except UnicodeEncodeError:
pass
else:
bytes_slice = ExprNodes.SliceIndexNode(
slice_node.pos,
base=ExprNodes.BytesNode(
slice_node.pos, value=bytes_value,
constant_result=bytes_value,
type=PyrexTypes.c_const_char_ptr_type).coerce_to(
PyrexTypes.c_const_uchar_ptr_type, self.current_env()),
start=None,
stop=ExprNodes.IntNode(
slice_node.pos, value=str(len(bytes_value)),
constant_result=len(bytes_value),
type=PyrexTypes.c_py_ssize_t_type),
type=Builtin.unicode_type, # hint for Python conversion
)
return self._transform_carray_iteration(node, bytes_slice, reversed)
unpack_temp_node = UtilNodes.LetRefNode(
slice_node.as_none_safe_node("'NoneType' is not iterable"))
start_node = ExprNodes.IntNode(
node.pos, value='0', constant_result=0, type=PyrexTypes.c_py_ssize_t_type)
length_temp = UtilNodes.TempHandle(PyrexTypes.c_py_ssize_t_type)
end_node = length_temp.ref(node.pos)
if reversed:
relation1, relation2 = '>', '>='
start_node, end_node = end_node, start_node
else:
relation1, relation2 = '<=', '<'
kind_temp = UtilNodes.TempHandle(PyrexTypes.c_int_type)
data_temp = UtilNodes.TempHandle(PyrexTypes.c_void_ptr_type)
counter_temp = UtilNodes.TempHandle(PyrexTypes.c_py_ssize_t_type)
target_value = ExprNodes.PythonCapiCallNode(
slice_node.pos, "__Pyx_PyUnicode_READ",
self.PyUnicode_READ_func_type,
args = [kind_temp.ref(slice_node.pos),
data_temp.ref(slice_node.pos),
counter_temp.ref(node.target.pos)],
is_temp = False,
)
if target_value.type != node.target.type:
target_value = target_value.coerce_to(node.target.type,
self.current_env())
target_assign = Nodes.SingleAssignmentNode(
pos = node.target.pos,
lhs = node.target,
rhs = target_value)
body = Nodes.StatListNode(
node.pos,
stats = [target_assign, node.body])
loop_node = Nodes.ForFromStatNode(
node.pos,
bound1=start_node, relation1=relation1,
target=counter_temp.ref(node.target.pos),
relation2=relation2, bound2=end_node,
step=None, body=body,
else_clause=node.else_clause,
from_range=True)
setup_node = Nodes.ExprStatNode(
node.pos,
expr = ExprNodes.PythonCapiCallNode(
slice_node.pos, "__Pyx_init_unicode_iteration",
self.init_unicode_iteration_func_type,
args = [unpack_temp_node,
ExprNodes.AmpersandNode(slice_node.pos, operand=length_temp.ref(slice_node.pos),
type=PyrexTypes.c_py_ssize_t_ptr_type),
ExprNodes.AmpersandNode(slice_node.pos, operand=data_temp.ref(slice_node.pos),
type=PyrexTypes.c_void_ptr_ptr_type),
ExprNodes.AmpersandNode(slice_node.pos, operand=kind_temp.ref(slice_node.pos),
type=PyrexTypes.c_int_ptr_type),
],
is_temp = True,
result_is_used = False,
utility_code=UtilityCode.load_cached("unicode_iter", "Optimize.c"),
))
return UtilNodes.LetNode(
unpack_temp_node,
UtilNodes.TempsBlockNode(
node.pos, temps=[counter_temp, length_temp, data_temp, kind_temp],
body=Nodes.StatListNode(node.pos, stats=[setup_node, loop_node])))
def _transform_carray_iteration(self, node, slice_node, reversed=False):
neg_step = False
if isinstance(slice_node, ExprNodes.SliceIndexNode):
slice_base = slice_node.base
start = filter_none_node(slice_node.start)
stop = filter_none_node(slice_node.stop)
step = None
if not stop:
if not slice_base.type.is_pyobject:
error(slice_node.pos, "C array iteration requires known end index")
return node
elif slice_node.is_subscript:
assert isinstance(slice_node.index, ExprNodes.SliceNode)
slice_base = slice_node.base
index = slice_node.index
start = filter_none_node(index.start)
stop = filter_none_node(index.stop)
step = filter_none_node(index.step)
if step:
if not isinstance(step.constant_result, int) \
or step.constant_result == 0 \
or step.constant_result > 0 and not stop \
or step.constant_result < 0 and not start:
if not slice_base.type.is_pyobject:
error(step.pos, "C array iteration requires known step size and end index")
return node
else:
# step sign is handled internally by ForFromStatNode
step_value = step.constant_result
if reversed:
step_value = -step_value
neg_step = step_value < 0
step = ExprNodes.IntNode(step.pos, type=PyrexTypes.c_py_ssize_t_type,
value=str(abs(step_value)),
constant_result=abs(step_value))
elif slice_node.type.is_array:
if slice_node.type.size is None:
error(slice_node.pos, "C array iteration requires known end index")
return node
slice_base = slice_node
start = None
stop = ExprNodes.IntNode(
slice_node.pos, value=str(slice_node.type.size),
type=PyrexTypes.c_py_ssize_t_type, constant_result=slice_node.type.size)
step = None
else:
if not slice_node.type.is_pyobject:
error(slice_node.pos, "C array iteration requires known end index")
return node
if start:
start = start.coerce_to(PyrexTypes.c_py_ssize_t_type, self.current_env())
if stop:
stop = stop.coerce_to(PyrexTypes.c_py_ssize_t_type, self.current_env())
if stop is None:
if neg_step:
stop = ExprNodes.IntNode(
slice_node.pos, value='-1', type=PyrexTypes.c_py_ssize_t_type, constant_result=-1)
else:
error(slice_node.pos, "C array iteration requires known step size and end index")
return node
if reversed:
if not start:
start = ExprNodes.IntNode(slice_node.pos, value="0", constant_result=0,
type=PyrexTypes.c_py_ssize_t_type)
# if step was provided, it was already negated above
start, stop = stop, start
ptr_type = slice_base.type
if ptr_type.is_array:
ptr_type = ptr_type.element_ptr_type()
carray_ptr = slice_base.coerce_to_simple(self.current_env())
if start and start.constant_result != 0:
start_ptr_node = ExprNodes.AddNode(
start.pos,
operand1=carray_ptr,
operator='+',
operand2=start,
type=ptr_type)
else:
start_ptr_node = carray_ptr
if stop and stop.constant_result != 0:
stop_ptr_node = ExprNodes.AddNode(
stop.pos,
operand1=ExprNodes.CloneNode(carray_ptr),
operator='+',
operand2=stop,
type=ptr_type
).coerce_to_simple(self.current_env())
else:
stop_ptr_node = ExprNodes.CloneNode(carray_ptr)
counter = UtilNodes.TempHandle(ptr_type)
counter_temp = counter.ref(node.target.pos)
if slice_base.type.is_string and node.target.type.is_pyobject:
# special case: char* -> bytes/unicode
if slice_node.type is Builtin.unicode_type:
target_value = ExprNodes.CastNode(
ExprNodes.DereferenceNode(
node.target.pos, operand=counter_temp,
type=ptr_type.base_type),
PyrexTypes.c_py_ucs4_type).coerce_to(
node.target.type, self.current_env())
else:
# char* -> bytes coercion requires slicing, not indexing
target_value = ExprNodes.SliceIndexNode(
node.target.pos,
start=ExprNodes.IntNode(node.target.pos, value='0',
constant_result=0,
type=PyrexTypes.c_int_type),
stop=ExprNodes.IntNode(node.target.pos, value='1',
constant_result=1,
type=PyrexTypes.c_int_type),
base=counter_temp,
type=Builtin.bytes_type,
is_temp=1)
elif node.target.type.is_ptr and not node.target.type.assignable_from(ptr_type.base_type):
# Allow iteration with pointer target to avoid copy.
target_value = counter_temp
else:
# TODO: can this safely be replaced with DereferenceNode() as above?
target_value = ExprNodes.IndexNode(
node.target.pos,
index=ExprNodes.IntNode(node.target.pos, value='0',
constant_result=0,
type=PyrexTypes.c_int_type),
base=counter_temp,
type=ptr_type.base_type)
if target_value.type != node.target.type:
target_value = target_value.coerce_to(node.target.type,
self.current_env())
target_assign = Nodes.SingleAssignmentNode(
pos = node.target.pos,
lhs = node.target,
rhs = target_value)
body = Nodes.StatListNode(
node.pos,
stats = [target_assign, node.body])
relation1, relation2 = self._find_for_from_node_relations(neg_step, reversed)
for_node = Nodes.ForFromStatNode(
node.pos,
bound1=start_ptr_node, relation1=relation1,
target=counter_temp,
relation2=relation2, bound2=stop_ptr_node,
step=step, body=body,
else_clause=node.else_clause,
from_range=True)
return UtilNodes.TempsBlockNode(
node.pos, temps=[counter],
body=for_node)
def _transform_enumerate_iteration(self, node, enumerate_function):
args = enumerate_function.arg_tuple.args
if len(args) == 0:
error(enumerate_function.pos,
"enumerate() requires an iterable argument")
return node
elif len(args) > 2:
error(enumerate_function.pos,
"enumerate() takes at most 2 arguments")
return node
if not node.target.is_sequence_constructor:
# leave this untouched for now
return node
targets = node.target.args
if len(targets) != 2:
# leave this untouched for now
return node
enumerate_target, iterable_target = targets
counter_type = enumerate_target.type
if not counter_type.is_pyobject and not counter_type.is_int:
# nothing we can do here, I guess
return node
if len(args) == 2:
start = unwrap_coerced_node(args[1]).coerce_to(counter_type, self.current_env())
else:
start = ExprNodes.IntNode(enumerate_function.pos,
value='0',
type=counter_type,
constant_result=0)
temp = UtilNodes.LetRefNode(start)
inc_expression = ExprNodes.AddNode(
enumerate_function.pos,
operand1 = temp,
operand2 = ExprNodes.IntNode(node.pos, value='1',
type=counter_type,
constant_result=1),
operator = '+',
type = counter_type,
#inplace = True, # not worth using in-place operation for Py ints
is_temp = counter_type.is_pyobject
)
loop_body = [
Nodes.SingleAssignmentNode(
pos = enumerate_target.pos,
lhs = enumerate_target,
rhs = temp),
Nodes.SingleAssignmentNode(
pos = enumerate_target.pos,
lhs = temp,
rhs = inc_expression)
]
if isinstance(node.body, Nodes.StatListNode):
node.body.stats = loop_body + node.body.stats
else:
loop_body.append(node.body)
node.body = Nodes.StatListNode(
node.body.pos,
stats = loop_body)
node.target = iterable_target
node.item = node.item.coerce_to(iterable_target.type, self.current_env())
node.iterator.sequence = args[0]
# recurse into loop to check for further optimisations
return UtilNodes.LetNode(temp, self._optimise_for_loop(node, node.iterator.sequence))
def _find_for_from_node_relations(self, neg_step_value, reversed):
if reversed:
if neg_step_value:
return '<', '<='
else:
return '>', '>='
else:
if neg_step_value:
return '>=', '>'
else:
return '<=', '<'
def _transform_range_iteration(self, node, range_function, reversed=False):
args = range_function.arg_tuple.args
if len(args) < 3:
step_pos = range_function.pos
step_value = 1
step = ExprNodes.IntNode(step_pos, value='1', constant_result=1)
else:
step = args[2]
step_pos = step.pos
if not isinstance(step.constant_result, int):
# cannot determine step direction
return node
step_value = step.constant_result
if step_value == 0:
# will lead to an error elsewhere
return node
step = ExprNodes.IntNode(step_pos, value=str(step_value),
constant_result=step_value)
if len(args) == 1:
bound1 = ExprNodes.IntNode(range_function.pos, value='0',
constant_result=0)
bound2 = args[0].coerce_to_index(self.current_env())
else:
bound1 = args[0].coerce_to_index(self.current_env())
bound2 = args[1].coerce_to_index(self.current_env())
relation1, relation2 = self._find_for_from_node_relations(step_value < 0, reversed)
bound2_ref_node = None
if reversed:
bound1, bound2 = bound2, bound1
abs_step = abs(step_value)
if abs_step != 1:
if (isinstance(bound1.constant_result, int) and
isinstance(bound2.constant_result, int)):
# calculate final bounds now
if step_value < 0:
begin_value = bound2.constant_result
end_value = bound1.constant_result
bound1_value = begin_value - abs_step * ((begin_value - end_value - 1) // abs_step) - 1
else:
begin_value = bound1.constant_result
end_value = bound2.constant_result
bound1_value = end_value + abs_step * ((begin_value - end_value - 1) // abs_step) + 1
bound1 = ExprNodes.IntNode(
bound1.pos, value=str(bound1_value), constant_result=bound1_value,
type=PyrexTypes.spanning_type(bound1.type, bound2.type))
else:
# evaluate the same expression as above at runtime
bound2_ref_node = UtilNodes.LetRefNode(bound2)
bound1 = self._build_range_step_calculation(
bound1, bound2_ref_node, step, step_value)
if step_value < 0:
step_value = -step_value
step.value = str(step_value)
step.constant_result = step_value
step = step.coerce_to_index(self.current_env())
if not bound2.is_literal:
# stop bound must be immutable => keep it in a temp var
bound2_is_temp = True
bound2 = bound2_ref_node or UtilNodes.LetRefNode(bound2)
else:
bound2_is_temp = False
for_node = Nodes.ForFromStatNode(
node.pos,
target=node.target,
bound1=bound1, relation1=relation1,
relation2=relation2, bound2=bound2,
step=step, body=node.body,
else_clause=node.else_clause,
from_range=True)
for_node.set_up_loop(self.current_env())
if bound2_is_temp:
for_node = UtilNodes.LetNode(bound2, for_node)
return for_node
def _build_range_step_calculation(self, bound1, bound2_ref_node, step, step_value):
abs_step = abs(step_value)
spanning_type = PyrexTypes.spanning_type(bound1.type, bound2_ref_node.type)
if step.type.is_int and abs_step < 0x7FFF:
# Avoid loss of integer precision warnings.
spanning_step_type = PyrexTypes.spanning_type(spanning_type, PyrexTypes.c_int_type)
else:
spanning_step_type = PyrexTypes.spanning_type(spanning_type, step.type)
if step_value < 0:
begin_value = bound2_ref_node
end_value = bound1
final_op = '-'
else:
begin_value = bound1
end_value = bound2_ref_node
final_op = '+'
step_calculation_node = ExprNodes.binop_node(
bound1.pos,
operand1=ExprNodes.binop_node(
bound1.pos,
operand1=bound2_ref_node,
operator=final_op, # +/-
operand2=ExprNodes.MulNode(
bound1.pos,
operand1=ExprNodes.IntNode(
bound1.pos,
value=str(abs_step),
constant_result=abs_step,
type=spanning_step_type),
operator='*',
operand2=ExprNodes.DivNode(
bound1.pos,
operand1=ExprNodes.SubNode(
bound1.pos,
operand1=ExprNodes.SubNode(
bound1.pos,
operand1=begin_value,
operator='-',
operand2=end_value,
type=spanning_type),
operator='-',
operand2=ExprNodes.IntNode(
bound1.pos,
value='1',
constant_result=1),
type=spanning_step_type),
operator='//',
operand2=ExprNodes.IntNode(
bound1.pos,
value=str(abs_step),
constant_result=abs_step,
type=spanning_step_type),
type=spanning_step_type),
type=spanning_step_type),
type=spanning_step_type),
operator=final_op, # +/-
operand2=ExprNodes.IntNode(
bound1.pos,
value='1',
constant_result=1),
type=spanning_type)
return step_calculation_node
def _transform_dict_iteration(self, node, dict_obj, method, keys, values):
temps = []
temp = UtilNodes.TempHandle(PyrexTypes.py_object_type)
temps.append(temp)
dict_temp = temp.ref(dict_obj.pos)
temp = UtilNodes.TempHandle(PyrexTypes.c_py_ssize_t_type)
temps.append(temp)
pos_temp = temp.ref(node.pos)
key_target = value_target = tuple_target = None
if keys and values:
if node.target.is_sequence_constructor:
if len(node.target.args) == 2:
key_target, value_target = node.target.args
else:
# unusual case that may or may not lead to an error
return node
else:
tuple_target = node.target
elif keys:
key_target = node.target
else:
value_target = node.target
if isinstance(node.body, Nodes.StatListNode):
body = node.body
else:
body = Nodes.StatListNode(pos = node.body.pos,
stats = [node.body])
# keep original length to guard against dict modification
dict_len_temp = UtilNodes.TempHandle(PyrexTypes.c_py_ssize_t_type)
temps.append(dict_len_temp)
dict_len_temp_addr = ExprNodes.AmpersandNode(
node.pos, operand=dict_len_temp.ref(dict_obj.pos),
type=PyrexTypes.c_ptr_type(dict_len_temp.type))
temp = UtilNodes.TempHandle(PyrexTypes.c_int_type)
temps.append(temp)
is_dict_temp = temp.ref(node.pos)
is_dict_temp_addr = ExprNodes.AmpersandNode(
node.pos, operand=is_dict_temp,
type=PyrexTypes.c_ptr_type(temp.type))
iter_next_node = Nodes.DictIterationNextNode(
dict_temp, dict_len_temp.ref(dict_obj.pos), pos_temp,
key_target, value_target, tuple_target,
is_dict_temp)
iter_next_node = iter_next_node.analyse_expressions(self.current_env())
body.stats[0:0] = [iter_next_node]
if method:
method_node = ExprNodes.StringNode(
dict_obj.pos, is_identifier=True, value=method)
dict_obj = dict_obj.as_none_safe_node(