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_unify.py
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_unify.py
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# Copyright 2017 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import itertools
import traceback
from enum import Enum
from typing import List, Tuple, Set, Optional, Union, MutableMapping, Mapping, Dict, TypeVar, overload, \
Iterator
from bidict import bidict
from _py2tmp.compiler.stages import expr_to_cpp_simple
from _py2tmp.ir0 import NameReplacementTransformation, ir
from _py2tmp.ir0_optimization._replace_var_with_expr import replace_var_with_expr_in_expr
from _py2tmp.unification import TupleExpansion, UnificationStrategyForCanonicalization, UnificationStrategy, \
UnificationFailedException, unify, UnificationAmbiguousException, CanonicalizationFailedException, canonicalize
from _py2tmp.utils import ir_to_string
def _unpack_if_variable(expr: ir.Expr,
var_names: Set[str],
literal_expr_by_unique_name: MutableMapping[str, ir.AtomicTypeLiteral]):
if isinstance(expr, ir.VariadicTypeExpansion):
return TupleExpansion(_unpack_if_variable(expr.inner_expr, var_names, literal_expr_by_unique_name))
if isinstance(expr, ir.AtomicTypeLiteral) and expr.cpp_type in var_names:
# We keep track of the expr so that we can re-pack this later.
# If there are multiple they must be the same.
if expr.cpp_type in literal_expr_by_unique_name:
assert expr == literal_expr_by_unique_name[expr.cpp_type], '%s vs %s. Detailed:\n%s\n-- vs --\n%s' % (
expr_to_cpp_simple(expr),
expr_to_cpp_simple(literal_expr_by_unique_name[expr.cpp_type]),
ir_to_string(expr),
ir_to_string(literal_expr_by_unique_name[expr.cpp_type]))
else:
literal_expr_by_unique_name[expr.cpp_type] = expr
return expr.cpp_type
else:
return expr
@overload
def _pack_if_variable(var_or_expr: str,
literal_expr_by_unique_name: Mapping[str, ir.AtomicTypeLiteral]) -> Union[ir.Expr, Tuple[ir.Expr, ...]]: ...
@overload
def _pack_if_variable(var_or_expr: ir.Expr,
literal_expr_by_unique_name: Mapping[str, ir.AtomicTypeLiteral]) -> ir.Expr: ...
@overload
def _pack_if_variable(var_or_expr: TupleExpansion[ir.Expr],
literal_expr_by_unique_name: Mapping[str, ir.AtomicTypeLiteral]) -> ir.VariadicTypeExpansion: ...
def _pack_if_variable(var_or_expr: Union[str, ir.Expr, TupleExpansion[ir.Expr]],
literal_expr_by_unique_name: Mapping[str, ir.AtomicTypeLiteral]) -> Union[ir.Expr, Tuple[ir.Expr, ...]]:
assert not isinstance(var_or_expr, tuple)
if isinstance(var_or_expr, str):
return literal_expr_by_unique_name[var_or_expr]
elif isinstance(var_or_expr, TupleExpansion):
return ir.VariadicTypeExpansion(_pack_if_variable(var_or_expr.expr, literal_expr_by_unique_name))
else:
return var_or_expr
class _ExprUnificationStrategy(UnificationStrategyForCanonicalization[ir.Expr]):
def __init__(self,
var_names: Set[str],
pattern_var_names: Set[str],
literal_expr_by_unique_name: MutableMapping[str, ir.AtomicTypeLiteral]):
self.var_names = var_names
self.pattern_var_names = pattern_var_names
self.literal_expr_by_unique_name = literal_expr_by_unique_name
def is_same_term_excluding_args(self, term1: ir.Expr, term2: ir.Expr):
return term1.is_same_expr_excluding_subexpressions(term2)
def get_term_args(self, term: ir.Expr) -> Tuple[Union[str, ir.Expr]]:
return tuple(_unpack_if_variable(expr, self.var_names, self.literal_expr_by_unique_name)
for expr in term.direct_subexpressions)
def replace_variables_in_expr(self, expr: UnificationStrategy.Expr,
replacements: Dict[str, Tuple[UnificationStrategy.Expr, ...]],
expanded_var_replacements: Dict[str, Tuple[UnificationStrategy.Expr, ...]]) -> UnificationStrategy.Expr:
replacements = {var: (tuple(_pack_if_variable(value, self.literal_expr_by_unique_name) for value in values)
if isinstance(values, tuple)
else _pack_if_variable(values, self.literal_expr_by_unique_name))
for var, values in replacements.items()}
expanded_var_replacements = {var: (tuple(_pack_if_variable(value, self.literal_expr_by_unique_name) for value in values)
if isinstance(values, tuple)
else _pack_if_variable(values, self.literal_expr_by_unique_name))
for var, values in expanded_var_replacements.items()}
expr = replace_var_with_expr_in_expr(expr=_pack_if_variable(expr, self.literal_expr_by_unique_name),
replacement_expr_by_var=replacements,
replacement_expr_by_expanded_var=expanded_var_replacements)
if isinstance(expr, tuple):
return tuple(_unpack_if_variable(expr1,
self.var_names,
self.literal_expr_by_unique_name)
for expr1 in expr)
else:
return _unpack_if_variable(expr,
self.var_names,
self.literal_expr_by_unique_name)
def can_var_be_on_lhs(self, var: str) -> bool:
return var in self.pattern_var_names
def term_to_string(self, term: ir.Expr):
return '"' + expr_to_cpp_simple(term) + '"\n' + ir_to_string(term)
def equality_requires_syntactical_equality(self, term: ir.Expr):
return {
ir.Literal: lambda t: True,
ir.PointerTypeExpr: lambda t: True,
ir.ConstTypeExpr: lambda t: True,
ir.ArrayTypeExpr: lambda t: True,
ir.FunctionTypeExpr: lambda t: True,
ir.TemplateInstantiation: lambda t: True,
# This is False because different expansions might expand to the same things (even a different number of
# them).
ir.VariadicTypeExpansion: lambda t: False,
# These are False because they operate on values, not types, the result can be expressed with a literal too.
ir.ComparisonExpr: lambda t: False,
ir.Int64BinaryOpExpr: lambda t: False,
ir.BoolBinaryOpExpr: lambda t: False,
ir.NotExpr: lambda t: False,
ir.UnaryMinusExpr: lambda t: False,
# This is False in general because the result can be any type/value, but it's true in the special case of
# nonlocal classes/templates (note: this assumes that they are actually classes/templates, not just
# possibly-templated using declarations).
ir.AtomicTypeLiteral: lambda t: not t.is_local and not t.may_be_alias,
# This is False because the result can be any type/value
ir.ClassMemberAccess: lambda t: False,
# These two are False because of collapsing: std::is_same<int&, (int&) &&>
ir.ReferenceTypeExpr: lambda t: False,
ir.RvalueReferenceTypeExpr: lambda t: False,
}[term.__class__](term)
def may_be_equal(self, term1: ir.Expr, term2: ir.Expr):
assert not self.is_same_term_excluding_args(term1, term2)
assert not self.equality_requires_syntactical_equality(term1) or not self.equality_requires_syntactical_equality(term2)
if not self.equality_requires_syntactical_equality(term1) and not self.equality_requires_syntactical_equality(term2):
return True
if self.equality_requires_syntactical_equality(term2):
term2, term1 = term1, term2
assert self.equality_requires_syntactical_equality(term1)
assert not self.equality_requires_syntactical_equality(term2)
if term2.__class__ in (ir.ReferenceTypeExpr, ir.RvalueReferenceTypeExpr) and term1.__class__ != ir.AtomicTypeLiteral:
# A reference/rvalue-reference can't be equal to a non-reference, non-atomic expr.
return False
return True
ExprOrExprTuple = TypeVar('ExprOrExprTuple', ir.Expr, Tuple[ir.Expr, ...])
def _replace_var_names_in_expr(expr: ExprOrExprTuple, new_name_by_old_name: Mapping[str, str]) -> ExprOrExprTuple:
if isinstance(expr, tuple):
return tuple(_replace_var_names_in_expr(elem, new_name_by_old_name)
for elem in expr)
return NameReplacementTransformation(new_name_by_old_name).transform_expr(expr)
class UnificationResultKind(Enum):
CERTAIN = 1
POSSIBLE = 2
IMPOSSIBLE = 3
class UnificationResult:
def __init__(self,
kind: UnificationResultKind,
pattern_var_expr_equations: Optional[Tuple[Tuple[ir.AtomicTypeLiteral,
Tuple[ir.Expr, ...]], ...]] = None,
value_by_expanded_pattern_variable: Optional[Tuple[Tuple[ir.VariadicTypeExpansion,
Tuple[ir.Expr, ...]], ...]] = None):
assert (pattern_var_expr_equations is not None) == (kind == UnificationResultKind.CERTAIN)
self.kind = kind
self.value_by_pattern_variable = pattern_var_expr_equations
self.value_by_expanded_pattern_variable = value_by_expanded_pattern_variable
def find_matches_in_unification_of_template_instantiation_with_definition(template_instantiation: ir.TemplateInstantiation,
local_var_definitions: Mapping[str, ir.Expr],
template_defn: ir.TemplateDefn,
identifier_generator: Iterator[str],
verbose: bool) -> Tuple[Tuple[Tuple[ir.TemplateSpecialization,
Tuple[Tuple[ir.AtomicTypeLiteral, Tuple[ir.Expr, ...]], ...],
Tuple[Tuple[ir.AtomicTypeLiteral, Tuple[ir.Expr, ...]], ...]], ...],
Tuple[ir.TemplateSpecialization, ...]]:
instantiation_vars = {var.cpp_type
for var in template_instantiation.free_vars}
certain_matches: List[Tuple[ir.TemplateSpecialization,
Tuple[Tuple[ir.AtomicTypeLiteral,
Tuple[ir.Expr, ...]], ...], ...]] = []
possible_matches: List[ir.TemplateSpecialization] = []
for specialization in template_defn.specializations:
result = _unify(template_instantiation.args,
local_var_definitions,
specialization.patterns,
instantiation_vars,
{arg.name
for arg in specialization.args},
identifier_generator,
verbose)
if result.kind == UnificationResultKind.CERTAIN:
certain_matches.append((specialization, result.value_by_pattern_variable, result.value_by_expanded_pattern_variable))
elif result.kind == UnificationResultKind.POSSIBLE:
possible_matches.append(specialization)
if template_defn.main_definition and template_defn.main_definition.body:
patterns = tuple(ir.VariadicTypeExpansion(ir.AtomicTypeLiteral.for_local(var.name,
var.expr_type,
is_variadic=var.is_variadic))
if var.is_variadic
else ir.AtomicTypeLiteral.for_local(var.name, var.expr_type, is_variadic=var.is_variadic)
for var in template_defn.main_definition.args)
result = _unify(template_instantiation.args,
local_var_definitions,
patterns,
instantiation_vars,
{var.name
for var in template_defn.main_definition.args},
identifier_generator,
verbose)
assert result.kind != UnificationResultKind.IMPOSSIBLE
if result.kind == UnificationResultKind.CERTAIN:
certain_matches.append((template_defn.main_definition,
result.value_by_pattern_variable,
result.value_by_expanded_pattern_variable))
else:
possible_matches.append(template_defn.main_definition)
if not certain_matches:
return (), tuple(possible_matches)
might_be_best_match = [True for _ in certain_matches]
for i, (specialization1, _, _) in enumerate(certain_matches):
specialization1_arg_vars = {var.name for var in specialization1.args}
for j, (specialization2, _, _) in enumerate(certain_matches):
if i != j and might_be_best_match[i] and might_be_best_match[j]:
specialization2_arg_vars = {var.name for var in specialization2.args}
# Let's see if we can prove that certain_matches[i] is more strict than certain_matches[j]
if not specialization1.patterns:
might_be_best_match[i] = False
continue
if not specialization2.patterns:
might_be_best_match[j] = False
continue
result = _unify(specialization1.patterns,
dict(),
specialization2.patterns,
specialization1_arg_vars,
specialization2_arg_vars,
identifier_generator,
verbose)
if result.kind == UnificationResultKind.CERTAIN:
might_be_best_match[j] = False
indexes = tuple(index
for index, might_be_best in enumerate(might_be_best_match)
if might_be_best)
assert indexes
return tuple(certain_matches[i]
for i in indexes), tuple(possible_matches)
def is_syntactically_equal(expr1: ir.Expr, expr2: ir.Expr):
if not expr1.is_same_expr_excluding_subexpressions(expr2):
return False
subexpressions1 = list(expr1.direct_subexpressions)
subexpressions2 = list(expr2.direct_subexpressions)
if len(subexpressions1) != len(subexpressions2):
return False
return all(is_syntactically_equal(expr1, expr2)
for expr1, expr2 in zip(subexpressions1, subexpressions2))
def unify_template_instantiation_with_definition(template_instantiation: ir.TemplateInstantiation,
local_var_definitions: Mapping[str, ir.Expr],
result_elem_name: str,
template_defn: ir.TemplateDefn,
identifier_generator: Iterator[str],
verbose: bool) -> Union[None,
Tuple[ir.TemplateSpecialization,
Optional[Tuple[Tuple[
ir.AtomicTypeLiteral, Tuple[
ir.Expr, ...]], ...]]],
Tuple[ir.TemplateSpecialization,
Optional[Tuple[Tuple[
ir.AtomicTypeLiteral, Tuple[
ir.Expr, ...]], ...]]],
ir.Expr]:
certain_matches, possible_matches = find_matches_in_unification_of_template_instantiation_with_definition(template_instantiation=template_instantiation,
local_var_definitions=local_var_definitions,
template_defn=template_defn,
identifier_generator=identifier_generator,
verbose=verbose)
possible_matches = [(specialization, None, None)
for specialization in possible_matches]
if certain_matches or possible_matches:
result_exprs: List[ir.Expr] = []
for specialization, _, _ in itertools.chain(certain_matches, possible_matches):
if any(isinstance(elem, ir.StaticAssert)
for elem in specialization.body):
break
[result_elem] = [elem
for elem in specialization.body
if isinstance(elem, (ir.ConstantDef, ir.Typedef)) and elem.name == result_elem_name]
assert isinstance(result_elem, (ir.ConstantDef, ir.Typedef))
if any(True for _ in result_elem.expr.free_vars):
break
result_exprs.append(result_elem.expr)
else:
# If we didn't break out of the loop, it means that all certain/possible matches would lead to a result
# expr with no free vars.
first_result_expr = result_exprs[0]
for expr in result_exprs:
if not is_syntactically_equal(expr, first_result_expr):
break
else:
# If we didn't break out of the loop, it means that all certain/possible matches would lead to *the same*
# result expr with no free vars.
return first_result_expr
if possible_matches:
# This must be stricter than all certain matches (if any) so we can't pick one for sure.
if verbose:
print('No unification found for template %s because there was a result with kind POSSIBLE, so we can\'t inline that.' % template_defn.name)
return None
if not certain_matches:
if verbose:
print('No unification found for template %s because there were no matches with kind==CERTAIN, so we can\'t inline that.' % template_defn.name)
return None
if len(certain_matches) == 1:
return certain_matches[0]
# We've found multiple specializations that definitely match and aren't stricter than each other.
# We can't say for certain which one will be chosen (it probably depends on the specific arguments of the caller
# template).
if verbose:
print('No unification found for template %s because there were multiple specializations with kind==CERTAIN and none of them was stricter than the others. Solutions:\n%s' % (
template_defn.name,
'\n'.join('{%s}' % ', '.join('%s = [%s]' % (pattern_var.cpp_type, ', '.join(expr_to_cpp_simple(value) for value in values))
for pattern_var, values in replacements)
for specialization, replacements in certain_matches)))
return None
def _unify(initial_exprs: Tuple[ir.Expr, ...],
local_var_definitions: Mapping[str, ir.Expr],
patterns: Tuple[ir.Expr, ...],
expr_variables: Set[str],
pattern_variables: Set[str],
identifier_generator: Iterator[str],
verbose: bool) -> UnificationResult:
# We need to replace local literals before doing the unification, to avoid assuming that e.g. T in an expr
# is equal to T in a pattern just because they have the same name.
lhs_type_literal_names = set(local_var_definitions.keys())
for expr in itertools.chain(initial_exprs, local_var_definitions.values()):
for expr_literal in expr.free_vars:
lhs_type_literal_names.add(expr_literal.cpp_type)
unique_var_name_by_expr_type_literal_name = bidict({lhs_type_literal_name: next(identifier_generator)
for lhs_type_literal_name in lhs_type_literal_names})
unique_var_name_by_pattern_type_literal_name = bidict({pattern_literal.cpp_type: next(identifier_generator)
for pattern in patterns
for pattern_literal in pattern.free_vars})
unique_var_names = set()
for expr_var_name, unique_var_name in unique_var_name_by_expr_type_literal_name.items():
if expr_var_name in expr_variables or expr_var_name in local_var_definitions:
unique_var_names.add(unique_var_name)
for pattern_var_name, unique_var_name in unique_var_name_by_pattern_type_literal_name.items():
if pattern_var_name in pattern_variables:
unique_var_names.add(unique_var_name)
literal_expr_by_unique_name: Dict[str, ir.AtomicTypeLiteral] = dict()
lhs = tuple(_replace_var_names_in_expr(expr, unique_var_name_by_expr_type_literal_name)
for expr in initial_exprs)
rhs = tuple(_replace_var_names_in_expr(pattern, unique_var_name_by_pattern_type_literal_name)
for pattern in patterns)
context = [(unique_var_name_by_expr_type_literal_name[local_var_name], _replace_var_names_in_expr(value, unique_var_name_by_expr_type_literal_name))
for local_var_name, value in local_var_definitions.items()]
lhs = tuple(_unpack_if_variable(expr, unique_var_names, literal_expr_by_unique_name)
for expr in lhs)
rhs = tuple(_unpack_if_variable(pattern, unique_var_names, literal_expr_by_unique_name)
for pattern in rhs)
context = {_unpack_if_variable(var, unique_var_names, literal_expr_by_unique_name): _unpack_if_variable(expr, unique_var_names, literal_expr_by_unique_name)
for var, expr in context}
unification_strategy = _ExprUnificationStrategy(unique_var_names,
set(unique_var_name_by_pattern_type_literal_name.inv.keys()),
literal_expr_by_unique_name)
try:
var_expr_equations, expanded_var_expr_equations = unify([(lhs, rhs)],
context,
unification_strategy) # type: Tuple[Dict[str, Union[str, ExprOrExprTuple]], Dict[str, List[ir.Expr]]]
except UnificationFailedException:
if verbose:
print('unify(exprs=[%s], local_var_definitions={%s}, patterns=[%s], expr_variables=[%s], pattern_variables=[%s], ...):\nUsing name mappings: %s, %s\nReturning IMPOSSIBLE due to exception: %s' % (
', '.join(expr_to_cpp_simple(expr) for expr in initial_exprs),
', '.join('%s = %s' % (var, expr_to_cpp_simple(expr)) for var, expr in local_var_definitions.items()),
', '.join(expr_to_cpp_simple(pattern) for pattern in patterns),
', '.join(expr_variable for expr_variable in expr_variables),
', '.join(pattern_variable for pattern_variable in pattern_variables),
unique_var_name_by_expr_type_literal_name,
unique_var_name_by_pattern_type_literal_name,
traceback.format_exc()))
return UnificationResult(UnificationResultKind.IMPOSSIBLE)
except UnificationAmbiguousException:
if verbose:
print('unify(exprs=[%s], local_var_definitions={%s}, patterns=[%s], expr_variables=[%s], pattern_variables=[%s], ...):\nUsing name mappings: %s, %s\nReturning POSSIBLE due to exception: %s' % (
', '.join(expr_to_cpp_simple(expr) for expr in initial_exprs),
', '.join('%s = %s' % (var, expr_to_cpp_simple(expr)) for var, expr in local_var_definitions.items()),
', '.join(expr_to_cpp_simple(pattern) for pattern in patterns),
', '.join(expr_variable for expr_variable in expr_variables),
', '.join(pattern_variable for pattern_variable in pattern_variables),
unique_var_name_by_expr_type_literal_name,
unique_var_name_by_pattern_type_literal_name,
traceback.format_exc()))
return UnificationResult(UnificationResultKind.POSSIBLE)
except AssertionError as e:
if verbose:
print('unify(exprs=[%s], local_var_definitions={%s}, patterns=[%s], expr_variables=[%s], pattern_variables=[%s], ...):\nUsing name mappings: %s, %s\nAssertionError' % (
', '.join(expr_to_cpp_simple(expr) for expr in initial_exprs),
', '.join('%s = %s' % (var, expr_to_cpp_simple(expr)) for var, expr in local_var_definitions.items()),
', '.join(expr_to_cpp_simple(pattern) for pattern in patterns),
', '.join(expr_variable for expr_variable in expr_variables),
', '.join(pattern_variable for pattern_variable in pattern_variables),
unique_var_name_by_expr_type_literal_name,
unique_var_name_by_pattern_type_literal_name))
raise
try:
var_expr_equations = canonicalize(var_expr_equations, expanded_var_expr_equations, unification_strategy)
except CanonicalizationFailedException:
if verbose:
print('unify(exprs=[%s], local_var_definitions={%s}, patterns=[%s], expr_variables=[%s], pattern_variables=[%s], ...):\nUsing name mappings: %s, %s\nReturning POSSIBLE due to exception: %s' % (
', '.join(expr_to_cpp_simple(expr) for expr in initial_exprs),
', '.join('%s = %s' % (var, expr_to_cpp_simple(expr)) for var, expr in local_var_definitions.items()),
', '.join(expr_to_cpp_simple(pattern) for pattern in patterns),
', '.join(expr_variable for expr_variable in expr_variables),
', '.join(pattern_variable for pattern_variable in pattern_variables),
unique_var_name_by_expr_type_literal_name,
unique_var_name_by_pattern_type_literal_name,
traceback.format_exc()))
return UnificationResult(UnificationResultKind.POSSIBLE)
except AssertionError as e:
if verbose:
print('unify(exprs=[%s], local_var_definitions={%s}, patterns=[%s], expr_variables=[%s], pattern_variables=[%s], ...):\nUsing name mappings: %s, %s\nvar_expr_equations = %s\nAssertionError' % (
', '.join(expr_to_cpp_simple(expr) for expr in initial_exprs),
', '.join('%s = %s' % (var, expr_to_cpp_simple(expr)) for var, expr in local_var_definitions.items()),
', '.join(expr_to_cpp_simple(pattern) for pattern in patterns),
', '.join(expr_variable for expr_variable in expr_variables),
', '.join(pattern_variable for pattern_variable in pattern_variables),
unique_var_name_by_expr_type_literal_name,
unique_var_name_by_pattern_type_literal_name,
var_expr_equations))
raise
var_expr_equations: List[Tuple[Union[ir.Expr, Tuple[ir.Expr, ...]],
Union[Tuple[ExprOrExprTuple, ...],
ExprOrExprTuple]]] \
= [(_pack_if_variable(var, literal_expr_by_unique_name),
tuple(_pack_if_variable(expr, literal_expr_by_unique_name) for expr in exprs)
if isinstance(exprs, tuple)
else _pack_if_variable(exprs, literal_expr_by_unique_name))
for var, exprs in var_expr_equations]
# At this point all equations should be of the form var=expr, with var a variable from a pattern and expr containing
# no vars from patterns.
for lhs_var, exprs in var_expr_equations:
if isinstance(lhs_var, ir.VariadicTypeExpansion):
lhs_var = lhs_var.inner_expr
assert isinstance(lhs_var, ir.AtomicTypeLiteral)
if lhs_var.cpp_type in unique_var_name_by_pattern_type_literal_name.inv:
if isinstance(exprs, tuple):
for expr in exprs:
for rhs_var in expr.free_vars:
assert rhs_var.cpp_type not in unique_var_name_by_pattern_type_literal_name.inv
else:
for rhs_var in exprs.free_vars:
assert rhs_var.cpp_type not in unique_var_name_by_pattern_type_literal_name.inv
# We reverse the var renaming done above
result_var_expr_equations: List[Tuple[ir.AtomicTypeLiteral, Tuple[ir.Expr, ...]]] = []
result_expanded_var_expr_equations: List[Tuple[ir.VariadicTypeExpansion, Tuple[ir.Expr, ...]]] = []
for var, exprs in var_expr_equations:
if isinstance(var, ir.VariadicTypeExpansion):
assert isinstance(exprs, tuple)
result_expanded_var_expr_equations.append((_replace_var_names_in_expr(var, unique_var_name_by_pattern_type_literal_name.inv),
tuple(_replace_var_names_in_expr(expr, unique_var_name_by_expr_type_literal_name.inv)
for expr in exprs)))
else:
assert isinstance(var, ir.AtomicTypeLiteral)
result_var_expr_equations.append((_replace_var_names_in_expr(var, unique_var_name_by_pattern_type_literal_name.inv),
_replace_var_names_in_expr(exprs, unique_var_name_by_expr_type_literal_name.inv)))
for var, exprs in var_expr_equations:
for expr in (exprs if isinstance(exprs, tuple) else (exprs,)):
if var.expr_type != expr.expr_type:
if verbose:
print('unify(exprs=[%s], local_var_definitions={%s}, patterns=[%s], expr_variables=[%s], pattern_variables=[%s], ...):\nUsing name mappings: %s, %s\nReturning IMPOSSIBLE due to type mismatch:\n%s\nwith type:\n%s\n=== vs ===\n%s\nwith type:\n%s' % (
', '.join(expr_to_cpp_simple(expr) for expr in initial_exprs),
', '.join('%s = %s' % (var, expr_to_cpp_simple(expr)) for var, expr in local_var_definitions.items()),
', '.join(expr_to_cpp_simple(pattern) for pattern in patterns),
', '.join(expr_variable for expr_variable in expr_variables),
', '.join(pattern_variable for pattern_variable in pattern_variables),
unique_var_name_by_expr_type_literal_name,
unique_var_name_by_pattern_type_literal_name,
expr_to_cpp_simple(var),
str(var.expr_type),
expr_to_cpp_simple(expr),
str(expr.expr_type)))
return UnificationResult(UnificationResultKind.IMPOSSIBLE)
for var, _ in result_var_expr_equations:
assert isinstance(var, ir.AtomicTypeLiteral)
for var, _ in result_expanded_var_expr_equations:
assert isinstance(var, ir.VariadicTypeExpansion) and isinstance(var.inner_expr, ir.AtomicTypeLiteral)
if verbose:
print('unify(exprs=[%s], local_var_definitions={%s}, patterns=[%s], expr_variables=[%s], pattern_variables=[%s], ...):\nUsing name mappings: %s, %s\nReturning CERTAIN with result_var_expr_equations:\n%s\nresult_expanded_var_expr_equations:\n%s' % (
', '.join(expr_to_cpp_simple(expr) for expr in initial_exprs),
', '.join('%s = %s' % (var, expr_to_cpp_simple(expr)) for var, expr in local_var_definitions.items()),
', '.join(expr_to_cpp_simple(pattern) for pattern in patterns),
', '.join(expr_variable for expr_variable in expr_variables),
', '.join(pattern_variable for pattern_variable in pattern_variables),
unique_var_name_by_expr_type_literal_name,
unique_var_name_by_pattern_type_literal_name,
'\n'.join(expr_to_cpp_simple(var) + ' = [' + ', '.join(expr_to_cpp_simple(expr)
for expr in (exprs if isinstance(exprs, tuple) else (exprs,))) + ']'
for var, exprs in result_var_expr_equations),
'\n'.join(expr_to_cpp_simple(var) + ' = [' + ', '.join(expr_to_cpp_simple(expr)
for expr in (exprs if isinstance(exprs, tuple) else (exprs,))) + ']'
for var, exprs in result_expanded_var_expr_equations)))
return UnificationResult(UnificationResultKind.CERTAIN, tuple(result_var_expr_equations), tuple(result_expanded_var_expr_equations))