def template_member_access(class_expr: ir0.Expr, member_name: str,
num_args: int):
return ir0.ClassMemberAccess(
class_type_expr=class_expr,
member_name=member_name,
member_type=ir0.TemplateType(
args=[ir0.TemplateArgType(ir0.TypeType(), is_variadic=False)] *
num_args))
def transform_class_member_access(
self, class_member_access: ir0.ClassMemberAccess):
if (isinstance(class_member_access.expr, ir0.TemplateInstantiation)
and isinstance(class_member_access.expr.template_expr,
ir0.AtomicTypeLiteral)
and class_member_access.expr.template_expr.cpp_type
in self.movable_arg_indexes_by_template_name):
assert isinstance(class_member_access.expr.template_expr.expr_type,
ir0.TemplateType)
# F<X, Y>::type -> F<X>::type<Y> (if X is used in non-trivial patterns and Y isn't)
args = self.transform_exprs(class_member_access.expr.args,
class_member_access.expr)
movable_arg_indexes = self.movable_arg_indexes_by_template_name[
class_member_access.expr.template_expr.cpp_type]
template_instantiation_arg_exprs = [
arg for index, arg in enumerate(args)
if index not in movable_arg_indexes
]
typedef_instantiation_arg_exprs = [
arg for index, arg in enumerate(args)
if index in movable_arg_indexes
]
typedef_instantiation_arg_types = [
arg_type for index, arg_type in enumerate(
class_member_access.expr.template_expr.expr_type.args)
if index in movable_arg_indexes
]
template_instantiation = ir0.TemplateInstantiation(
template_expr=ir0.AtomicTypeLiteral.for_nonlocal_template(
cpp_type=class_member_access.expr.template_expr.cpp_type,
args=[
arg for index, arg in
enumerate(class_member_access.expr.template_expr.
expr_type.args)
if index not in movable_arg_indexes
],
is_metafunction_that_may_return_error=class_member_access.
expr.template_expr.is_metafunction_that_may_return_error,
may_be_alias=True),
args=template_instantiation_arg_exprs,
instantiation_might_trigger_static_asserts=class_member_access.
expr.instantiation_might_trigger_static_asserts)
new_class_member_access = ir0.ClassMemberAccess(
class_type_expr=template_instantiation,
member_name=class_member_access.member_name,
member_type=ir0.TemplateType(typedef_instantiation_arg_types))
return ir0.TemplateInstantiation(
template_expr=new_class_member_access,
args=typedef_instantiation_arg_exprs,
instantiation_might_trigger_static_asserts=class_member_access.
expr.instantiation_might_trigger_static_asserts)
else:
return super().transform_class_member_access(class_member_access)
def _local_metafunction_call(template_var_name: str,
arg_types: Sequence[ir0.TemplateArgType],
args: Sequence[ir0.Expr],
instantiation_might_trigger_static_asserts: bool,
member_name: str, member_type: ir0.ExprType):
return _metafunction_call(template_expr=ir0.AtomicTypeLiteral.for_local(
template_var_name, ir0.TemplateType(args=arg_types),
is_variadic=False),
args=args,
instantiation_might_trigger_static_asserts=
instantiation_might_trigger_static_asserts,
member_name=member_name,
member_type=member_type)
def transform_type_literal(self, type_literal: ir.AtomicTypeLiteral):
if self.additional_typedef_args_in_current_template and type_literal.cpp_type in self.locals_to_instantiate:
assert isinstance(type_literal.expr_type, ir0.TypeType)
# X5 -> X5<T, U>, if X5 is defined by a local typedef and we're moving {X,U} to be typedef template args
# instead of args of the template defn.
return ir0.TemplateInstantiation(
template_expr=ir.AtomicTypeLiteral.for_local(
cpp_type=type_literal.cpp_type,
expr_type=ir0.TemplateType([
ir0.TemplateArgType(expr_type=arg.expr_type,
is_variadic=arg.is_variadic) for
arg in self.additional_typedef_args_in_current_template
]),
is_variadic=False),
args=[
ir0.AtomicTypeLiteral.for_local(
cpp_type=arg.name,
expr_type=arg.expr_type,
is_variadic=arg.is_variadic)
for arg in self.additional_typedef_args_in_current_template
],
instantiation_might_trigger_static_asserts=False)
else:
return type_literal
def _template_template_arg_type(*args: ir0.TemplateArgType):
return ir0.TemplateArgType(expr_type=ir0.TemplateType(args),
is_variadic=False)
def _template_template_arg_decl(name: str, *args: ir0.TemplateArgType):
return ir0.TemplateArgDecl(expr_type=ir0.TemplateType(args),
name=name,
is_variadic=False)
],
type_expr=_local_type('Acc')),
specializations=[
_specialization(
args=[
_type_arg_decl('Acc'),
_template_template_arg_decl('F', _type_arg_type(),
_bool_arg_type()),
_bool_arg_decl('b'),
_variadic_bool_arg_decl('bs')
],
patterns=[
_local_type('Acc'),
ir0.AtomicTypeLiteral.for_local(
'F',
ir0.TemplateType([_type_arg_type(),
_bool_arg_type()]),
is_variadic=False),
_local_bool('b'),
ir0.VariadicTypeExpansion(_local_variadic_bool('bs'))
],
type_expr=_fold_bools_to_type(
_local_metafunction_call(
'F',
arg_types=[_type_arg_type(),
_bool_arg_type()],
args=[_local_type('Acc'),
_local_bool('b')],
instantiation_might_trigger_static_asserts=True,
member_name='type',
member_type=ir0.TypeType()),
ir0.AtomicTypeLiteral.for_local(
def template_instantiation_to_cpp(instantiation_expr: ir0.TemplateInstantiation,
enclosing_function_defn_args: List[ir0.TemplateArgDecl],
writer: Writer,
omit_typename=False):
args = instantiation_expr.args
if instantiation_expr.instantiation_might_trigger_static_asserts and enclosing_function_defn_args and args:
bound_variables = {arg_decl.name
for arg_decl in enclosing_function_defn_args}
assert bound_variables
# TODO: We could avoid adding a param dependency in more cases by checking for references to local variables
# that depend (directly or indirectly) on a param.
if not any(arg.references_any_of(bound_variables)
for arg in args):
# All template arguments are (or might be) constants, we need to add a reference to a variable bound in this
# function to prevent the instantiation from happening early, potentially triggering static asserts.
arg_decl = _select_best_arg_decl_for_select1st(enclosing_function_defn_args)
arg_index = _select_best_arg_expr_index_for_select1st(args)
arg_to_replace = args[arg_index]
is_variadic = is_expr_variadic(arg_to_replace)
if arg_decl.expr_type.kind != ir0.ExprKind.TEMPLATE and arg_to_replace.expr_type.kind != ir0.ExprKind.TEMPLATE:
# We use lambdas here just to make sure we collect code coverage of each "branch". They are not necessary.
# Note that we use the *Type variants for variadic types too. That's ok, since e.g.
# Select1stBoolType<b, Args> will be expanded as e.g. Select1stBoolType<b, Args>... so it's exactly what
# we want in the variadic case too.
select1st_variant = {
(ir0.ExprKind.BOOL, ir0.ExprKind.BOOL): lambda: 'Select1stBoolBool',
(ir0.ExprKind.BOOL, ir0.ExprKind.INT64): lambda: 'Select1stBoolInt64',
(ir0.ExprKind.BOOL, ir0.ExprKind.TYPE): lambda: 'Select1stBoolType',
(ir0.ExprKind.INT64, ir0.ExprKind.BOOL): lambda: 'Select1stInt64Bool',
(ir0.ExprKind.INT64, ir0.ExprKind.INT64): lambda: 'Select1stInt64Int64',
(ir0.ExprKind.INT64, ir0.ExprKind.TYPE): lambda: 'Select1stInt64Type',
(ir0.ExprKind.TYPE, ir0.ExprKind.BOOL): lambda: 'Select1stTypeBool',
(ir0.ExprKind.TYPE, ir0.ExprKind.INT64): lambda: 'Select1stTypeInt64',
(ir0.ExprKind.TYPE, ir0.ExprKind.TYPE): lambda: 'Select1stTypeType',
}[(arg_to_replace.expr_type.kind, arg_decl.expr_type.kind)]()
else:
# We need to define a new Select1st variant for the desired function type.
select1st_variant = writer.new_id()
forwarded_param_id = writer.new_id()
template_param_decl1 = _type_to_template_param_declaration(expr_type=arg_to_replace.expr_type, is_variadic=is_variadic)
template_param_decl2 = _type_to_template_param_declaration(expr_type=arg_decl.expr_type, is_variadic=arg_decl.is_variadic)
select1st_variant_body_writer = TemplateElemWriter(writer.get_toplevel_writer())
if arg_to_replace.expr_type.kind in (ir0.ExprKind.BOOL, ir0.ExprKind.INT64):
select1st_variant_body = ir0.ConstantDef(name='value',
expr=ir0.AtomicTypeLiteral.for_local(cpp_type=forwarded_param_id,
expr_type=arg_to_replace.expr_type,
is_variadic=is_variadic))
constant_def_to_cpp(select1st_variant_body, enclosing_function_defn_args, select1st_variant_body_writer)
else:
replaced_type = arg_to_replace.expr_type
assert replaced_type.kind in (ir0.ExprKind.TYPE, ir0.ExprKind.TEMPLATE)
select1st_variant_body = ir0.Typedef(name='value',
expr=ir0.AtomicTypeLiteral.for_local(cpp_type=forwarded_param_id,
expr_type=replaced_type,
is_variadic=is_variadic))
typedef_to_cpp(select1st_variant_body, enclosing_function_defn_args, select1st_variant_body_writer)
select1st_variant_body_str = ''.join(select1st_variant_body_writer.strings)
writer.write_template_body_elem('''
// Custom Select1st* template
template <{template_param_decl1} {forwarded_param_id}, {template_param_decl2}>
struct {select1st_variant} {{
{select1st_variant_body_str}
}};
'''.format(**locals()))
select1st_type = ir0.TemplateType(args=[
ir0.TemplateArgType(expr_type=arg_to_replace.expr_type, is_variadic=is_variadic),
arg_decl])
select1st_instantiation = ir0.TemplateInstantiation(template_expr=ir0.AtomicTypeLiteral.for_local(cpp_type=select1st_variant,
expr_type=select1st_type,
is_variadic=False),
args=[arg_to_replace,
ir0.AtomicTypeLiteral.for_local(cpp_type=arg_decl.name,
expr_type=arg_decl.expr_type,
is_variadic=arg_decl.is_variadic)],
instantiation_might_trigger_static_asserts=False)
new_arg = ir0.ClassMemberAccess(class_type_expr=select1st_instantiation,
member_name='value',
member_type=arg_to_replace.expr_type)
args = args[:arg_index] + (new_arg,) + args[arg_index + 1:]
template_params = ', '.join(expr_to_cpp(arg, enclosing_function_defn_args, writer)
for arg in args)
if isinstance(instantiation_expr.template_expr, ir0.ClassMemberAccess):
cpp_fun = class_member_access_to_cpp(instantiation_expr.template_expr,
enclosing_function_defn_args,
writer,
omit_typename=omit_typename,
parent_expr_is_template_instantiation=True)
else:
cpp_fun = expr_to_cpp(instantiation_expr.template_expr, enclosing_function_defn_args, writer)
return '{cpp_fun}<{template_params}>'.format(**locals())
# using type = typename FoldBoolsToType<typename F<Acc, b>::type,
# F,
# bs...>::type;
# };
_define_template(name='FoldBoolsToType',
result_element_name='type',
main_definition=_specialization(args=(_type_arg_decl('Acc'),
_template_template_arg_decl('F', _type_arg_type(), _bool_arg_type()),
_variadic_bool_arg_decl('bs')),
type_expr=_local_type('Acc')),
specializations=(_specialization(args=(_type_arg_decl('Acc'),
_template_template_arg_decl('F', _type_arg_type(), _bool_arg_type()),
_bool_arg_decl('b'),
_variadic_bool_arg_decl('bs'),),
patterns=(_local_type('Acc'),
ir0.AtomicTypeLiteral.for_local('F', ir0.TemplateType((_type_arg_type(), _bool_arg_type())), is_variadic=False),
_local_bool('b'),
ir0.VariadicTypeExpansion(_local_variadic_bool('bs')),),
type_expr=_fold_bools_to_type(_local_metafunction_call('F',
arg_types=(_type_arg_type(), _bool_arg_type()),
args=(_local_type('Acc'),
_local_bool('b')),
instantiation_might_trigger_static_asserts=True,
member_name='type',
member_type=ir0.TypeType()),
ir0.AtomicTypeLiteral.for_local('F', ir0.TemplateType((_type_arg_type(), _bool_arg_type())), is_variadic=False),
ir0.VariadicTypeExpansion(_local_variadic_bool('bs')))),))
# template <typename L>
