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expression.py
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expression.py
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"""Transform mypy expression ASTs to mypyc IR (Intermediate Representation).
The top-level AST transformation logic is implemented in mypyc.irbuild.visitor
and mypyc.irbuild.builder.
"""
from __future__ import annotations
import math
from typing import Callable, Sequence
from mypy.nodes import (
ARG_POS,
LDEF,
AssertTypeExpr,
AssignmentExpr,
BytesExpr,
CallExpr,
CastExpr,
ComparisonExpr,
ComplexExpr,
ConditionalExpr,
DictExpr,
DictionaryComprehension,
EllipsisExpr,
Expression,
FloatExpr,
GeneratorExpr,
IndexExpr,
IntExpr,
ListComprehension,
ListExpr,
MemberExpr,
MypyFile,
NameExpr,
OpExpr,
RefExpr,
SetComprehension,
SetExpr,
SliceExpr,
StarExpr,
StrExpr,
SuperExpr,
TupleExpr,
TypeApplication,
TypeInfo,
UnaryExpr,
Var,
)
from mypy.types import Instance, ProperType, TupleType, TypeType, get_proper_type
from mypyc.common import MAX_SHORT_INT
from mypyc.ir.class_ir import ClassIR
from mypyc.ir.func_ir import FUNC_CLASSMETHOD, FUNC_STATICMETHOD
from mypyc.ir.ops import (
Assign,
BasicBlock,
ComparisonOp,
Integer,
LoadAddress,
LoadLiteral,
RaiseStandardError,
Register,
TupleGet,
TupleSet,
Value,
)
from mypyc.ir.rtypes import (
RTuple,
bool_rprimitive,
int_rprimitive,
is_fixed_width_rtype,
is_int_rprimitive,
is_list_rprimitive,
is_none_rprimitive,
object_rprimitive,
set_rprimitive,
)
from mypyc.irbuild.ast_helpers import is_borrow_friendly_expr, process_conditional
from mypyc.irbuild.builder import IRBuilder, int_borrow_friendly_op
from mypyc.irbuild.constant_fold import constant_fold_expr
from mypyc.irbuild.for_helpers import (
comprehension_helper,
translate_list_comprehension,
translate_set_comprehension,
)
from mypyc.irbuild.format_str_tokenizer import (
convert_format_expr_to_bytes,
convert_format_expr_to_str,
join_formatted_bytes,
join_formatted_strings,
tokenizer_printf_style,
)
from mypyc.irbuild.specialize import apply_function_specialization, apply_method_specialization
from mypyc.primitives.bytes_ops import bytes_slice_op
from mypyc.primitives.dict_ops import dict_get_item_op, dict_new_op, dict_set_item_op
from mypyc.primitives.generic_ops import iter_op
from mypyc.primitives.int_ops import int_comparison_op_mapping
from mypyc.primitives.list_ops import list_append_op, list_extend_op, list_slice_op
from mypyc.primitives.misc_ops import ellipsis_op, get_module_dict_op, new_slice_op, type_op
from mypyc.primitives.registry import CFunctionDescription, builtin_names
from mypyc.primitives.set_ops import set_add_op, set_in_op, set_update_op
from mypyc.primitives.str_ops import str_slice_op
from mypyc.primitives.tuple_ops import list_tuple_op, tuple_slice_op
# Name and attribute references
def transform_name_expr(builder: IRBuilder, expr: NameExpr) -> Value:
if expr.node is None:
builder.add(
RaiseStandardError(
RaiseStandardError.RUNTIME_ERROR,
"mypyc internal error: should be unreachable",
expr.line,
)
)
return builder.none()
fullname = expr.node.fullname
if fullname in builtin_names:
typ, src = builtin_names[fullname]
return builder.add(LoadAddress(typ, src, expr.line))
# special cases
if fullname == "builtins.None":
return builder.none()
if fullname == "builtins.True":
return builder.true()
if fullname == "builtins.False":
return builder.false()
math_literal = transform_math_literal(builder, fullname)
if math_literal is not None:
return math_literal
if isinstance(expr.node, Var) and expr.node.is_final:
value = builder.emit_load_final(
expr.node,
fullname,
expr.name,
builder.is_native_ref_expr(expr),
builder.types[expr],
expr.line,
)
if value is not None:
return value
if isinstance(expr.node, MypyFile) and expr.node.fullname in builder.imports:
return builder.load_module(expr.node.fullname)
# If the expression is locally defined, then read the result from the corresponding
# assignment target and return it. Otherwise if the expression is a global, load it from
# the globals dictionary.
# Except for imports, that currently always happens in the global namespace.
if expr.kind == LDEF and not (isinstance(expr.node, Var) and expr.node.is_suppressed_import):
# Try to detect and error when we hit the irritating mypy bug
# where a local variable is cast to None. (#5423)
if (
isinstance(expr.node, Var)
and is_none_rprimitive(builder.node_type(expr))
and expr.node.is_inferred
):
builder.error(
'Local variable "{}" has inferred type None; add an annotation'.format(
expr.node.name
),
expr.node.line,
)
# TODO: Behavior currently only defined for Var, FuncDef and MypyFile node types.
if isinstance(expr.node, MypyFile):
# Load reference to a module imported inside function from
# the modules dictionary. It would be closer to Python
# semantics to access modules imported inside functions
# via local variables, but this is tricky since the mypy
# AST doesn't include a Var node for the module. We
# instead load the module separately on each access.
mod_dict = builder.call_c(get_module_dict_op, [], expr.line)
obj = builder.call_c(
dict_get_item_op, [mod_dict, builder.load_str(expr.node.fullname)], expr.line
)
return obj
else:
return builder.read(builder.get_assignment_target(expr, for_read=True), expr.line)
return builder.load_global(expr)
def transform_member_expr(builder: IRBuilder, expr: MemberExpr) -> Value:
# First check if this is maybe a final attribute.
final = builder.get_final_ref(expr)
if final is not None:
fullname, final_var, native = final
value = builder.emit_load_final(
final_var, fullname, final_var.name, native, builder.types[expr], expr.line
)
if value is not None:
return value
math_literal = transform_math_literal(builder, expr.fullname)
if math_literal is not None:
return math_literal
if isinstance(expr.node, MypyFile) and expr.node.fullname in builder.imports:
return builder.load_module(expr.node.fullname)
can_borrow = builder.is_native_attr_ref(expr)
obj = builder.accept(expr.expr, can_borrow=can_borrow)
rtype = builder.node_type(expr)
# Special case: for named tuples transform attribute access to faster index access.
typ = get_proper_type(builder.types.get(expr.expr))
if isinstance(typ, TupleType) and typ.partial_fallback.type.is_named_tuple:
fields = typ.partial_fallback.type.metadata["namedtuple"]["fields"]
if expr.name in fields:
index = builder.builder.load_int(fields.index(expr.name))
return builder.gen_method_call(obj, "__getitem__", [index], rtype, expr.line)
check_instance_attribute_access_through_class(builder, expr, typ)
borrow = can_borrow and builder.can_borrow
return builder.builder.get_attr(obj, expr.name, rtype, expr.line, borrow=borrow)
def check_instance_attribute_access_through_class(
builder: IRBuilder, expr: MemberExpr, typ: ProperType | None
) -> None:
"""Report error if accessing an instance attribute through class object."""
if isinstance(expr.expr, RefExpr):
node = expr.expr.node
if isinstance(typ, TypeType) and isinstance(typ.item, Instance):
# TODO: Handle other item types
node = typ.item.type
if isinstance(node, TypeInfo):
class_ir = builder.mapper.type_to_ir.get(node)
if class_ir is not None and class_ir.is_ext_class:
sym = node.get(expr.name)
if (
sym is not None
and isinstance(sym.node, Var)
and not sym.node.is_classvar
and not sym.node.is_final
):
builder.error(
'Cannot access instance attribute "{}" through class object'.format(
expr.name
),
expr.line,
)
builder.note(
'(Hint: Use "x: Final = ..." or "x: ClassVar = ..." to define '
"a class attribute)",
expr.line,
)
def transform_super_expr(builder: IRBuilder, o: SuperExpr) -> Value:
# warning(builder, 'can not optimize super() expression', o.line)
sup_val = builder.load_module_attr_by_fullname("builtins.super", o.line)
if o.call.args:
args = [builder.accept(arg) for arg in o.call.args]
else:
assert o.info is not None
typ = builder.load_native_type_object(o.info.fullname)
ir = builder.mapper.type_to_ir[o.info]
iter_env = iter(builder.builder.args)
# Grab first argument
vself: Value = next(iter_env)
if builder.fn_info.is_generator:
# grab sixth argument (see comment in translate_super_method_call)
self_targ = list(builder.symtables[-1].values())[6]
vself = builder.read(self_targ, builder.fn_info.fitem.line)
elif not ir.is_ext_class:
vself = next(iter_env) # second argument is self if non_extension class
args = [typ, vself]
res = builder.py_call(sup_val, args, o.line)
return builder.py_get_attr(res, o.name, o.line)
# Calls
def transform_call_expr(builder: IRBuilder, expr: CallExpr) -> Value:
callee = expr.callee
if isinstance(expr.analyzed, CastExpr):
return translate_cast_expr(builder, expr.analyzed)
elif isinstance(expr.analyzed, AssertTypeExpr):
# Compile to a no-op.
return builder.accept(expr.analyzed.expr)
elif (
isinstance(callee, (NameExpr, MemberExpr))
and isinstance(callee.node, TypeInfo)
and callee.node.is_newtype
):
# A call to a NewType type is a no-op at runtime.
return builder.accept(expr.args[0])
if isinstance(callee, IndexExpr) and isinstance(callee.analyzed, TypeApplication):
callee = callee.analyzed.expr # Unwrap type application
if isinstance(callee, MemberExpr):
if isinstance(callee.expr, RefExpr) and isinstance(callee.expr.node, MypyFile):
# Call a module-level function, not a method.
return translate_call(builder, expr, callee)
return apply_method_specialization(builder, expr, callee) or translate_method_call(
builder, expr, callee
)
elif isinstance(callee, SuperExpr):
return translate_super_method_call(builder, expr, callee)
else:
return translate_call(builder, expr, callee)
def translate_call(builder: IRBuilder, expr: CallExpr, callee: Expression) -> Value:
# The common case of calls is refexprs
if isinstance(callee, RefExpr):
return apply_function_specialization(builder, expr, callee) or translate_refexpr_call(
builder, expr, callee
)
function = builder.accept(callee)
args = [builder.accept(arg) for arg in expr.args]
return builder.py_call(
function, args, expr.line, arg_kinds=expr.arg_kinds, arg_names=expr.arg_names
)
def translate_refexpr_call(builder: IRBuilder, expr: CallExpr, callee: RefExpr) -> Value:
"""Translate a non-method call."""
# Gen the argument values
arg_values = [builder.accept(arg) for arg in expr.args]
return builder.call_refexpr_with_args(expr, callee, arg_values)
def translate_method_call(builder: IRBuilder, expr: CallExpr, callee: MemberExpr) -> Value:
"""Generate IR for an arbitrary call of form e.m(...).
This can also deal with calls to module-level functions.
"""
if builder.is_native_ref_expr(callee):
# Call to module-level native function or such
return translate_call(builder, expr, callee)
elif (
isinstance(callee.expr, RefExpr)
and isinstance(callee.expr.node, TypeInfo)
and callee.expr.node in builder.mapper.type_to_ir
and builder.mapper.type_to_ir[callee.expr.node].has_method(callee.name)
):
# Call a method via the *class*
assert isinstance(callee.expr.node, TypeInfo)
ir = builder.mapper.type_to_ir[callee.expr.node]
return call_classmethod(builder, ir, expr, callee)
elif builder.is_module_member_expr(callee):
# Fall back to a PyCall for non-native module calls
function = builder.accept(callee)
args = [builder.accept(arg) for arg in expr.args]
return builder.py_call(
function, args, expr.line, arg_kinds=expr.arg_kinds, arg_names=expr.arg_names
)
else:
if isinstance(callee.expr, RefExpr):
node = callee.expr.node
if isinstance(node, Var) and node.is_cls:
typ = get_proper_type(node.type)
if isinstance(typ, TypeType) and isinstance(typ.item, Instance):
class_ir = builder.mapper.type_to_ir.get(typ.item.type)
if class_ir and class_ir.is_ext_class and class_ir.has_no_subclasses():
# Call a native classmethod via cls that can be statically bound,
# since the class has no subclasses.
return call_classmethod(builder, class_ir, expr, callee)
receiver_typ = builder.node_type(callee.expr)
# If there is a specializer for this method name/type, try calling it.
# We would return the first successful one.
val = apply_method_specialization(builder, expr, callee, receiver_typ)
if val is not None:
return val
obj = builder.accept(callee.expr)
args = [builder.accept(arg) for arg in expr.args]
return builder.gen_method_call(
obj,
callee.name,
args,
builder.node_type(expr),
expr.line,
expr.arg_kinds,
expr.arg_names,
)
def call_classmethod(builder: IRBuilder, ir: ClassIR, expr: CallExpr, callee: MemberExpr) -> Value:
decl = ir.method_decl(callee.name)
args = []
arg_kinds, arg_names = expr.arg_kinds.copy(), expr.arg_names.copy()
# Add the class argument for class methods in extension classes
if decl.kind == FUNC_CLASSMETHOD and ir.is_ext_class:
args.append(builder.load_native_type_object(ir.fullname))
arg_kinds.insert(0, ARG_POS)
arg_names.insert(0, None)
args += [builder.accept(arg) for arg in expr.args]
if ir.is_ext_class:
return builder.builder.call(decl, args, arg_kinds, arg_names, expr.line)
else:
obj = builder.accept(callee.expr)
return builder.gen_method_call(
obj,
callee.name,
args,
builder.node_type(expr),
expr.line,
expr.arg_kinds,
expr.arg_names,
)
def translate_super_method_call(builder: IRBuilder, expr: CallExpr, callee: SuperExpr) -> Value:
if callee.info is None or (len(callee.call.args) != 0 and len(callee.call.args) != 2):
return translate_call(builder, expr, callee)
# We support two-argument super but only when it is super(CurrentClass, self)
# TODO: We could support it when it is a parent class in many cases?
if len(callee.call.args) == 2:
self_arg = callee.call.args[1]
if (
not isinstance(self_arg, NameExpr)
or not isinstance(self_arg.node, Var)
or not self_arg.node.is_self
):
return translate_call(builder, expr, callee)
typ_arg = callee.call.args[0]
if (
not isinstance(typ_arg, NameExpr)
or not isinstance(typ_arg.node, TypeInfo)
or callee.info is not typ_arg.node
):
return translate_call(builder, expr, callee)
ir = builder.mapper.type_to_ir[callee.info]
# Search for the method in the mro, skipping ourselves. We
# determine targets of super calls to native methods statically.
for base in ir.mro[1:]:
if callee.name in base.method_decls:
break
else:
if (
ir.is_ext_class
and ir.builtin_base is None
and not ir.inherits_python
and callee.name == "__init__"
and len(expr.args) == 0
):
# Call translates to object.__init__(self), which is a
# no-op, so omit the call.
return builder.none()
return translate_call(builder, expr, callee)
decl = base.method_decl(callee.name)
arg_values = [builder.accept(arg) for arg in expr.args]
arg_kinds, arg_names = expr.arg_kinds.copy(), expr.arg_names.copy()
if decl.kind != FUNC_STATICMETHOD:
# Grab first argument
vself: Value = builder.self()
if decl.kind == FUNC_CLASSMETHOD:
vself = builder.call_c(type_op, [vself], expr.line)
elif builder.fn_info.is_generator:
# For generator classes, the self target is the 6th value
# in the symbol table (which is an ordered dict). This is sort
# of ugly, but we can't search by name since the 'self' parameter
# could be named anything, and it doesn't get added to the
# environment indexes.
self_targ = list(builder.symtables[-1].values())[6]
vself = builder.read(self_targ, builder.fn_info.fitem.line)
arg_values.insert(0, vself)
arg_kinds.insert(0, ARG_POS)
arg_names.insert(0, None)
return builder.builder.call(decl, arg_values, arg_kinds, arg_names, expr.line)
def translate_cast_expr(builder: IRBuilder, expr: CastExpr) -> Value:
src = builder.accept(expr.expr)
target_type = builder.type_to_rtype(expr.type)
return builder.coerce(src, target_type, expr.line)
# Operators
def transform_unary_expr(builder: IRBuilder, expr: UnaryExpr) -> Value:
folded = try_constant_fold(builder, expr)
if folded:
return folded
return builder.unary_op(builder.accept(expr.expr), expr.op, expr.line)
def transform_op_expr(builder: IRBuilder, expr: OpExpr) -> Value:
if expr.op in ("and", "or"):
return builder.shortcircuit_expr(expr)
# Special case for string formatting
if expr.op == "%" and isinstance(expr.left, (StrExpr, BytesExpr)):
ret = translate_printf_style_formatting(builder, expr.left, expr.right)
if ret is not None:
return ret
folded = try_constant_fold(builder, expr)
if folded:
return folded
borrow_left = False
borrow_right = False
ltype = builder.node_type(expr.left)
rtype = builder.node_type(expr.right)
# Special case some int ops to allow borrowing operands.
if is_int_rprimitive(ltype) and is_int_rprimitive(rtype):
if expr.op == "//":
expr = try_optimize_int_floor_divide(expr)
if expr.op in int_borrow_friendly_op:
borrow_left = is_borrow_friendly_expr(builder, expr.right)
borrow_right = True
elif is_fixed_width_rtype(ltype) and is_fixed_width_rtype(rtype):
borrow_left = is_borrow_friendly_expr(builder, expr.right)
borrow_right = True
left = builder.accept(expr.left, can_borrow=borrow_left)
right = builder.accept(expr.right, can_borrow=borrow_right)
return builder.binary_op(left, right, expr.op, expr.line)
def try_optimize_int_floor_divide(expr: OpExpr) -> OpExpr:
"""Replace // with a power of two with a right shift, if possible."""
if not isinstance(expr.right, IntExpr):
return expr
divisor = expr.right.value
shift = divisor.bit_length() - 1
if 0 < shift < 28 and divisor == (1 << shift):
return OpExpr(">>", expr.left, IntExpr(shift))
return expr
def transform_index_expr(builder: IRBuilder, expr: IndexExpr) -> Value:
index = expr.index
base_type = builder.node_type(expr.base)
is_list = is_list_rprimitive(base_type)
can_borrow_base = is_list and is_borrow_friendly_expr(builder, index)
base = builder.accept(expr.base, can_borrow=can_borrow_base)
if isinstance(base.type, RTuple) and isinstance(index, IntExpr):
return builder.add(TupleGet(base, index.value, expr.line))
if isinstance(index, SliceExpr):
value = try_gen_slice_op(builder, base, index)
if value:
return value
index_reg = builder.accept(expr.index, can_borrow=is_list)
return builder.gen_method_call(
base, "__getitem__", [index_reg], builder.node_type(expr), expr.line
)
def try_constant_fold(builder: IRBuilder, expr: Expression) -> Value | None:
"""Return the constant value of an expression if possible.
Return None otherwise.
"""
value = constant_fold_expr(builder, expr)
if value is not None:
return builder.load_literal_value(value)
return None
def try_gen_slice_op(builder: IRBuilder, base: Value, index: SliceExpr) -> Value | None:
"""Generate specialized slice op for some index expressions.
Return None if a specialized op isn't available.
This supports obj[x:y], obj[:x], and obj[x:] for a few types.
"""
if index.stride:
# We can only handle the default stride of 1.
return None
if index.begin_index:
begin_type = builder.node_type(index.begin_index)
else:
begin_type = int_rprimitive
if index.end_index:
end_type = builder.node_type(index.end_index)
else:
end_type = int_rprimitive
# Both begin and end index must be int (or missing).
if is_int_rprimitive(begin_type) and is_int_rprimitive(end_type):
if index.begin_index:
begin = builder.accept(index.begin_index)
else:
begin = builder.load_int(0)
if index.end_index:
end = builder.accept(index.end_index)
else:
# Replace missing end index with the largest short integer
# (a sequence can't be longer).
end = builder.load_int(MAX_SHORT_INT)
candidates = [list_slice_op, tuple_slice_op, str_slice_op, bytes_slice_op]
return builder.builder.matching_call_c(candidates, [base, begin, end], index.line)
return None
def transform_conditional_expr(builder: IRBuilder, expr: ConditionalExpr) -> Value:
if_body, else_body, next_block = BasicBlock(), BasicBlock(), BasicBlock()
process_conditional(builder, expr.cond, if_body, else_body)
expr_type = builder.node_type(expr)
# Having actual Phi nodes would be really nice here!
target = Register(expr_type)
builder.activate_block(if_body)
true_value = builder.accept(expr.if_expr)
true_value = builder.coerce(true_value, expr_type, expr.line)
builder.add(Assign(target, true_value))
builder.goto(next_block)
builder.activate_block(else_body)
false_value = builder.accept(expr.else_expr)
false_value = builder.coerce(false_value, expr_type, expr.line)
builder.add(Assign(target, false_value))
builder.goto(next_block)
builder.activate_block(next_block)
return target
def set_literal_values(builder: IRBuilder, items: Sequence[Expression]) -> list[object] | None:
values: list[object] = []
for item in items:
const_value = constant_fold_expr(builder, item)
if const_value is not None:
values.append(const_value)
continue
if isinstance(item, RefExpr):
if item.fullname == "builtins.None":
values.append(None)
elif item.fullname == "builtins.True":
values.append(True)
elif item.fullname == "builtins.False":
values.append(False)
elif isinstance(item, TupleExpr):
tuple_values = set_literal_values(builder, item.items)
if tuple_values is not None:
values.append(tuple(tuple_values))
if len(values) != len(items):
# Bail if not all items can be converted into values.
return None
return values
def precompute_set_literal(builder: IRBuilder, s: SetExpr) -> Value | None:
"""Try to pre-compute a frozenset literal during module initialization.
Return None if it's not possible.
Supported items:
- Anything supported by irbuild.constant_fold.constant_fold_expr()
- None, True, and False
- Tuple literals with only items listed above
"""
values = set_literal_values(builder, s.items)
if values is not None:
return builder.add(LoadLiteral(frozenset(values), set_rprimitive))
return None
def transform_comparison_expr(builder: IRBuilder, e: ComparisonExpr) -> Value:
# x in (...)/[...]
# x not in (...)/[...]
first_op = e.operators[0]
if (
first_op in ["in", "not in"]
and len(e.operators) == 1
and isinstance(e.operands[1], (TupleExpr, ListExpr))
):
items = e.operands[1].items
n_items = len(items)
# x in y -> x == y[0] or ... or x == y[n]
# x not in y -> x != y[0] and ... and x != y[n]
# 16 is arbitrarily chosen to limit code size
if 1 < n_items < 16:
if e.operators[0] == "in":
bin_op = "or"
cmp_op = "=="
else:
bin_op = "and"
cmp_op = "!="
lhs = e.operands[0]
mypy_file = builder.graph["builtins"].tree
assert mypy_file is not None
info = mypy_file.names["bool"].node
assert isinstance(info, TypeInfo)
bool_type = Instance(info, [])
exprs = []
for item in items:
expr = ComparisonExpr([cmp_op], [lhs, item])
builder.types[expr] = bool_type
exprs.append(expr)
or_expr: Expression = exprs.pop(0)
for expr in exprs:
or_expr = OpExpr(bin_op, or_expr, expr)
builder.types[or_expr] = bool_type
return builder.accept(or_expr)
# x in [y]/(y) -> x == y
# x not in [y]/(y) -> x != y
elif n_items == 1:
if e.operators[0] == "in":
cmp_op = "=="
else:
cmp_op = "!="
e.operators = [cmp_op]
e.operands[1] = items[0]
# x in []/() -> False
# x not in []/() -> True
elif n_items == 0:
if e.operators[0] == "in":
return builder.false()
else:
return builder.true()
# x in {...}
# x not in {...}
if (
first_op in ("in", "not in")
and len(e.operators) == 1
and isinstance(e.operands[1], SetExpr)
):
set_literal = precompute_set_literal(builder, e.operands[1])
if set_literal is not None:
lhs = e.operands[0]
result = builder.builder.call_c(
set_in_op, [builder.accept(lhs), set_literal], e.line, bool_rprimitive
)
if first_op == "not in":
return builder.unary_op(result, "not", e.line)
return result
if len(e.operators) == 1:
# Special some common simple cases
if first_op in ("is", "is not"):
right_expr = e.operands[1]
if isinstance(right_expr, NameExpr) and right_expr.fullname == "builtins.None":
# Special case 'is None' / 'is not None'.
return translate_is_none(builder, e.operands[0], negated=first_op != "is")
left_expr = e.operands[0]
if is_int_rprimitive(builder.node_type(left_expr)):
right_expr = e.operands[1]
if is_int_rprimitive(builder.node_type(right_expr)):
if first_op in int_borrow_friendly_op:
borrow_left = is_borrow_friendly_expr(builder, right_expr)
left = builder.accept(left_expr, can_borrow=borrow_left)
right = builder.accept(right_expr, can_borrow=True)
return builder.compare_tagged(left, right, first_op, e.line)
# TODO: Don't produce an expression when used in conditional context
# All of the trickiness here is due to support for chained conditionals
# (`e1 < e2 > e3`, etc). `e1 < e2 > e3` is approximately equivalent to
# `e1 < e2 and e2 > e3` except that `e2` is only evaluated once.
expr_type = builder.node_type(e)
# go(i, prev) generates code for `ei opi e{i+1} op{i+1} ... en`,
# assuming that prev contains the value of `ei`.
def go(i: int, prev: Value) -> Value:
if i == len(e.operators) - 1:
return transform_basic_comparison(
builder, e.operators[i], prev, builder.accept(e.operands[i + 1]), e.line
)
next = builder.accept(e.operands[i + 1])
return builder.builder.shortcircuit_helper(
"and",
expr_type,
lambda: transform_basic_comparison(builder, e.operators[i], prev, next, e.line),
lambda: go(i + 1, next),
e.line,
)
return go(0, builder.accept(e.operands[0]))
def translate_is_none(builder: IRBuilder, expr: Expression, negated: bool) -> Value:
v = builder.accept(expr, can_borrow=True)
return builder.binary_op(v, builder.none_object(), "is not" if negated else "is", expr.line)
def transform_basic_comparison(
builder: IRBuilder, op: str, left: Value, right: Value, line: int
) -> Value:
if (
is_int_rprimitive(left.type)
and is_int_rprimitive(right.type)
and op in int_comparison_op_mapping
):
return builder.compare_tagged(left, right, op, line)
if is_fixed_width_rtype(left.type) and op in int_comparison_op_mapping:
if right.type == left.type:
op_id = ComparisonOp.signed_ops[op]
return builder.builder.comparison_op(left, right, op_id, line)
elif isinstance(right, Integer):
op_id = ComparisonOp.signed_ops[op]
return builder.builder.comparison_op(
left, Integer(right.value >> 1, left.type), op_id, line
)
elif (
is_fixed_width_rtype(right.type)
and op in int_comparison_op_mapping
and isinstance(left, Integer)
):
op_id = ComparisonOp.signed_ops[op]
return builder.builder.comparison_op(
Integer(left.value >> 1, right.type), right, op_id, line
)
negate = False
if op == "is not":
op, negate = "is", True
elif op == "not in":
op, negate = "in", True
target = builder.binary_op(left, right, op, line)
if negate:
target = builder.unary_op(target, "not", line)
return target
def translate_printf_style_formatting(
builder: IRBuilder, format_expr: StrExpr | BytesExpr, rhs: Expression
) -> Value | None:
tokens = tokenizer_printf_style(format_expr.value)
if tokens is not None:
literals, format_ops = tokens
exprs = []
if isinstance(rhs, TupleExpr):
exprs = rhs.items
elif isinstance(rhs, Expression):
exprs.append(rhs)
if isinstance(format_expr, BytesExpr):
substitutions = convert_format_expr_to_bytes(
builder, format_ops, exprs, format_expr.line
)
if substitutions is not None:
return join_formatted_bytes(builder, literals, substitutions, format_expr.line)
else:
substitutions = convert_format_expr_to_str(
builder, format_ops, exprs, format_expr.line
)
if substitutions is not None:
return join_formatted_strings(builder, literals, substitutions, format_expr.line)
return None
# Literals
def transform_int_expr(builder: IRBuilder, expr: IntExpr) -> Value:
return builder.builder.load_int(expr.value)
def transform_float_expr(builder: IRBuilder, expr: FloatExpr) -> Value:
return builder.builder.load_float(expr.value)
def transform_complex_expr(builder: IRBuilder, expr: ComplexExpr) -> Value:
return builder.builder.load_complex(expr.value)
def transform_str_expr(builder: IRBuilder, expr: StrExpr) -> Value:
return builder.load_str(expr.value)
def transform_bytes_expr(builder: IRBuilder, expr: BytesExpr) -> Value:
return builder.load_bytes_from_str_literal(expr.value)
def transform_ellipsis(builder: IRBuilder, o: EllipsisExpr) -> Value:
return builder.add(LoadAddress(ellipsis_op.type, ellipsis_op.src, o.line))
# Display expressions
def transform_list_expr(builder: IRBuilder, expr: ListExpr) -> Value:
return _visit_list_display(builder, expr.items, expr.line)
def _visit_list_display(builder: IRBuilder, items: list[Expression], line: int) -> Value:
return _visit_display(
builder, items, builder.new_list_op, list_append_op, list_extend_op, line, True
)
def transform_tuple_expr(builder: IRBuilder, expr: TupleExpr) -> Value:
if any(isinstance(item, StarExpr) for item in expr.items):
# create a tuple of unknown length
return _visit_tuple_display(builder, expr)
# create a tuple of fixed length (RTuple)
tuple_type = builder.node_type(expr)
# When handling NamedTuple et. al we might not have proper type info,
# so make some up if we need it.
types = (
tuple_type.types
if isinstance(tuple_type, RTuple)
else [object_rprimitive] * len(expr.items)
)
items = []
for item_expr, item_type in zip(expr.items, types):
reg = builder.accept(item_expr)
items.append(builder.coerce(reg, item_type, item_expr.line))
return builder.add(TupleSet(items, expr.line))
def _visit_tuple_display(builder: IRBuilder, expr: TupleExpr) -> Value:
"""Create a list, then turn it into a tuple."""
val_as_list = _visit_list_display(builder, expr.items, expr.line)
return builder.call_c(list_tuple_op, [val_as_list], expr.line)
def transform_dict_expr(builder: IRBuilder, expr: DictExpr) -> Value:
"""First accepts all keys and values, then makes a dict out of them."""
key_value_pairs = []
for key_expr, value_expr in expr.items:
key = builder.accept(key_expr) if key_expr is not None else None
value = builder.accept(value_expr)
key_value_pairs.append((key, value))
return builder.builder.make_dict(key_value_pairs, expr.line)
def transform_set_expr(builder: IRBuilder, expr: SetExpr) -> Value:
return _visit_display(
builder, expr.items, builder.new_set_op, set_add_op, set_update_op, expr.line, False
)
def _visit_display(
builder: IRBuilder,
items: list[Expression],
constructor_op: Callable[[list[Value], int], Value],
append_op: CFunctionDescription,
extend_op: CFunctionDescription,
line: int,
is_list: bool,
) -> Value:
accepted_items = []
for item in items:
if isinstance(item, StarExpr):
accepted_items.append((True, builder.accept(item.expr)))
else:
accepted_items.append((False, builder.accept(item)))
result: Value | None = None
initial_items = []
for starred, value in accepted_items:
if result is None and not starred and is_list:
initial_items.append(value)
continue
if result is None:
result = constructor_op(initial_items, line)
builder.call_c(extend_op if starred else append_op, [result, value], line)
if result is None:
result = constructor_op(initial_items, line)
return result
# Comprehensions
def transform_list_comprehension(builder: IRBuilder, o: ListComprehension) -> Value:
return translate_list_comprehension(builder, o.generator)