| 1 | """
|
| 2 | conversion_pass.py - forward declarations, and virtuals
|
| 3 | """
|
| 4 | import mypy
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| 5 |
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| 6 | from mypy.nodes import (Expression, NameExpr, MemberExpr, TupleExpr, CallExpr,
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| 7 | ClassDef, FuncDef, Argument)
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| 8 | from mypy.types import Type, Instance, TupleType, NoneType, PartialType
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| 9 |
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| 10 | from mycpp import util
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| 11 | from mycpp.util import log, SplitPyName
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| 12 | from mycpp import pass_state
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| 13 | from mycpp import visitor
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| 14 | from mycpp import cppgen_pass
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| 15 |
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| 16 | from typing import Dict, List, Tuple, Optional, TYPE_CHECKING
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| 17 |
|
| 18 | if TYPE_CHECKING:
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| 19 | #from mycpp import cppgen_pass
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| 20 | pass
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| 21 |
|
| 22 | _ = log
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| 23 |
|
| 24 | DotExprs = Dict[MemberExpr, pass_state.member_t]
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| 25 |
|
| 26 |
|
| 27 | class MyTypeInfo:
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| 28 | """Like mypy.nodes.TypeInfo"""
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| 29 |
|
| 30 | def __init__(self, fullname: str) -> None:
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| 31 | self.fullname = fullname
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| 32 |
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| 33 |
|
| 34 | class Primitive(Instance):
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| 35 |
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| 36 | def __init__(self, name: str, args: List[Type] = None) -> None:
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| 37 | self.type = MyTypeInfo(name) # type: ignore
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| 38 | self.args = args if args is not None else []
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| 39 |
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| 40 |
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| 41 | MYCPP_INT = Primitive('builtins.int')
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| 42 |
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| 43 |
|
| 44 | class Pass(visitor.TypedVisitor):
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| 45 |
|
| 46 | def __init__(
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| 47 | self,
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| 48 | types: Dict[Expression, Type],
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| 49 | virtual: pass_state.Virtual,
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| 50 | forward_decls: List[str],
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| 51 | all_member_vars: 'cppgen_pass.AllMemberVars',
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| 52 | all_local_vars: 'cppgen_pass.AllLocalVars',
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| 53 | module_dot_exprs: DotExprs,
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| 54 | yield_out_params: Dict[FuncDef, Tuple[str, str]], # output
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| 55 | dunder_exit_special: Dict[ClassDef, bool],
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| 56 | ) -> None:
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| 57 | visitor.TypedVisitor.__init__(self, types)
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| 58 |
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| 59 | # These are all outputs we compute
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| 60 | self.virtual = virtual
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| 61 | self.forward_decls = forward_decls
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| 62 | self.all_member_vars = all_member_vars
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| 63 | self.all_local_vars = all_local_vars
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| 64 | self.module_dot_exprs = module_dot_exprs
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| 65 | # Used to add another param to definition, and
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| 66 | # yield x --> YIELD->append(x)
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| 67 | self.yield_out_params = yield_out_params
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| 68 | self.dunder_exit_special = dunder_exit_special
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| 69 |
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| 70 | # Internal state
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| 71 | self.inside_dunder_exit = None # type: Optional[ClassDef]
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| 72 | self.current_member_vars: Dict[str, 'cppgen_pass.MemberVar'] = {}
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| 73 | self.current_local_vars: List[Tuple[str, Type]] = []
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| 74 |
|
| 75 | # Where do we need to update current_local_vars?
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| 76 | #
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| 77 | # x = 42 # oils_visit_assignment_stmt
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| 78 | # a, b = foo
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| 79 |
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| 80 | # x = [y for y in other] # oils_visit_assign_to_listcomp_:
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| 81 | #
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| 82 | # Special case for enumerate:
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| 83 | # for i, x in enumerate(other):
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| 84 | #
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| 85 | # def f(p, q): # params are locals, _WriteFuncParams
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| 86 | # # but only if update_locals
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| 87 |
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| 88 | self.imported_names = set() # MemberExpr -> module::Foo() or self->foo
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| 89 | # HACK for conditional import inside mylib.PYTHON
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| 90 | # in core/shell.py
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| 91 | self.imported_names.add('help_meta')
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| 92 |
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| 93 | def visit_import(self, o: 'mypy.nodes.Import') -> None:
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| 94 | for name, as_name in o.ids:
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| 95 | if as_name is not None:
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| 96 | # import time as time_
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| 97 | self.imported_names.add(as_name)
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| 98 | else:
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| 99 | # import libc
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| 100 | self.imported_names.add(name)
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| 101 |
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| 102 | def visit_import_from(self, o: 'mypy.nodes.ImportFrom') -> None:
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| 103 | """
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| 104 | Write C++ namespace aliases and 'using' for imports.
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| 105 | We need them in the 'decl' phase for default arguments like
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| 106 | runtime_asdl::scope_e -> scope_e
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| 107 | """
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| 108 | # For MemberExpr . -> module::func() or this->field. Also needed in
|
| 109 | # the decl phase for default arg values.
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| 110 | for name, alias in o.names:
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| 111 | if alias:
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| 112 | self.imported_names.add(alias)
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| 113 | else:
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| 114 | self.imported_names.add(name)
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| 115 |
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| 116 | def oils_visit_member_expr(self, o: 'mypy.nodes.MemberExpr') -> None:
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| 117 | # asdl/runtime.py is missing types, so call GetTypeOptional
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| 118 | lhs_type = self._GetTypeOptional(o.expr) # type: Optional[Type]
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| 119 |
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| 120 | is_small_str = False
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| 121 | if util.SMALL_STR:
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| 122 | if util.IsStr(lhs_type):
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| 123 | is_small_str = True
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| 124 |
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| 125 | # This is an approximate hack that assumes that locals don't shadow
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| 126 | # imported names. Might be a problem with names like 'word'?
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| 127 | if is_small_str:
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| 128 | # mystr.upper()
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| 129 | dot = pass_state.StackObjectMember(
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| 130 | o.expr, lhs_type, o.name) # type: pass_state.member_t
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| 131 |
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| 132 | elif o.name in ('CreateNull', 'Take'):
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| 133 | # heuristic for MyType::CreateNull()
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| 134 | # MyType::Take(other)
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| 135 | type_name = self.types[o].ret_type.type.fullname
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| 136 | dot = pass_state.StaticClassMember(type_name, o.name)
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| 137 | elif (isinstance(o.expr, NameExpr) and
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| 138 | o.expr.name in self.imported_names):
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| 139 | # heuristic for state::Mem()
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| 140 | module_path = SplitPyName(o.expr.fullname or o.expr.name)
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| 141 | dot = pass_state.ModuleMember(module_path, o.name)
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| 142 | else:
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| 143 | # mylist->append(42)
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| 144 | dot = pass_state.HeapObjectMember(o.expr, lhs_type, o.name)
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| 145 |
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| 146 | self.module_dot_exprs[o] = dot
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| 147 |
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| 148 | self.accept(o.expr)
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| 149 |
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| 150 | def oils_visit_mypy_file(self, o: 'mypy.nodes.MypyFile') -> None:
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| 151 | mod_parts = o.fullname.split('.')
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| 152 | comment = 'forward declare'
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| 153 |
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| 154 | self.write('namespace %s { // %s\n', mod_parts[-1], comment)
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| 155 |
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| 156 | # Do default traversal
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| 157 | self.indent += 1
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| 158 | super().oils_visit_mypy_file(o)
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| 159 | self.indent -= 1
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| 160 |
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| 161 | self.write('}\n')
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| 162 | self.write('\n')
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| 163 |
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| 164 | def oils_visit_class_def(
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| 165 | self, o: 'mypy.nodes.ClassDef',
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| 166 | base_class_sym: Optional[util.SymbolPath],
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| 167 | current_class_name: Optional[util.SymbolPath]) -> None:
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| 168 | self.write_ind('class %s;\n', o.name)
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| 169 | if base_class_sym:
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| 170 | self.virtual.OnSubclass(base_class_sym, current_class_name)
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| 171 |
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| 172 | # Do default traversal of methods, associating member vars with the
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| 173 | # ClassDef node
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| 174 | self.current_member_vars = {}
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| 175 | super().oils_visit_class_def(o, base_class_sym, current_class_name)
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| 176 | self.all_member_vars[o] = self.current_member_vars
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| 177 |
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| 178 | def _ValidateDefaultArg(self, arg: Argument) -> None:
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| 179 | t = self._GetType(arg.initializer)
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| 180 |
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| 181 | valid = False
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| 182 | if isinstance(t, NoneType):
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| 183 | valid = True
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| 184 | if isinstance(t, Instance):
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| 185 | # Allowing strings since they're immutable, e.g.
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| 186 | # prefix='' seems OK
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| 187 | if t.type.fullname in ('builtins.bool', 'builtins.int',
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| 188 | 'builtins.float', 'builtins.str'):
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| 189 | valid = True
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| 190 |
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| 191 | # ASDL enums lex_mode_t, scope_t, ...
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| 192 | if t.type.fullname.endswith('_t'):
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| 193 | valid = True
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| 194 |
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| 195 | # Hack for loc__Missing. Should detect the general case.
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| 196 | if t.type.fullname.endswith('loc__Missing'):
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| 197 | valid = True
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| 198 |
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| 199 | if not valid:
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| 200 | self.report_error(
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| 201 | arg,
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| 202 | 'Invalid default arg %r of type %s (not None, bool, int, float, ASDL enum)'
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| 203 | % (arg.initializer, t))
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| 204 |
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| 205 | def _ValidateDefaultArgs(self, func_def: FuncDef) -> None:
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| 206 | arguments = func_def.arguments
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| 207 |
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| 208 | num_defaults = 0
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| 209 | for arg in arguments:
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| 210 | if arg.initializer:
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| 211 | self._ValidateDefaultArg(arg)
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| 212 | num_defaults += 1
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| 213 |
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| 214 | if num_defaults > 1:
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| 215 | # Report on first arg
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| 216 | self.report_error(
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| 217 | arg, '%s has %d default arguments. Only 1 is allowed' %
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| 218 | (func_def.name, num_defaults))
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| 219 | return
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| 220 |
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| 221 | def oils_visit_func_def(self, o: 'mypy.nodes.FuncDef',
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| 222 | current_class_name: Optional[util.SymbolPath],
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| 223 | current_method_name: Optional[str]) -> None:
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| 224 | self._ValidateDefaultArgs(o)
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| 225 |
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| 226 | self.virtual.OnMethod(current_class_name, o.name)
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| 227 |
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| 228 | self.current_local_vars = []
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| 229 |
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| 230 | # Add params as local vars, but only if we're NOT in a constructor.
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| 231 | # This is borrowed from cppgen_pass -
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| 232 | # _ConstructorImpl has update_locals=False, likewise for decl
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| 233 | # Is this just a convention?
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| 234 | # Counterexample: what if locals are used in __init__ after allocation?
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| 235 | # Are we assuming we never do mylib.MaybeCollect() inside a
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| 236 | # constructor? We can check that too.
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| 237 |
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| 238 | if current_method_name != '__init__':
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| 239 | # Add function params as locals, to be rooted
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| 240 | arg_types = o.type.arg_types
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| 241 | arg_names = [arg.variable.name for arg in o.arguments]
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| 242 | for name, typ in zip(arg_names, arg_types):
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| 243 | if name == 'self':
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| 244 | continue
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| 245 | self.current_local_vars.append((name, typ))
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| 246 |
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| 247 | # Traverse to collect member variables
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| 248 | super().oils_visit_func_def(o, current_class_name, current_method_name)
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| 249 | self.all_local_vars[o] = self.current_local_vars
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| 250 |
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| 251 | # Is this function is a generator? Then associate the node with an
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| 252 | # accumulator param (name and type).
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| 253 | # This is info is consumed by both the Decl and Impl passes
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| 254 | _, _, c_iter_list_type = cppgen_pass.GetCReturnType(o.type.ret_type)
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| 255 | if c_iter_list_type is not None:
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| 256 | self.yield_out_params[o] = ('YIELD', c_iter_list_type)
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| 257 |
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| 258 | def oils_visit_dunder_exit(self, o: ClassDef, stmt: FuncDef,
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| 259 | base_class_sym: util.SymbolPath) -> None:
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| 260 | self.inside_dunder_exit = o
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| 261 | super().oils_visit_dunder_exit(o, stmt, base_class_sym)
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| 262 | self.inside_dunder_exit = None
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| 263 |
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| 264 | def visit_return_stmt(self, o: 'mypy.nodes.ReturnStmt') -> None:
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| 265 | # Mark special destructors
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| 266 | if self.inside_dunder_exit:
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| 267 | self.dunder_exit_special[self.inside_dunder_exit] = True
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| 268 | super().visit_return_stmt(o)
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| 269 |
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| 270 | def visit_raise_stmt(self, o: 'mypy.nodes.RaiseStmt') -> None:
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| 271 | if self.inside_dunder_exit:
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| 272 | # Note: this doesn't check function calls that raise, but it's
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| 273 | # better than nothing
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| 274 | self.report_error(
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| 275 | o, "raise not allowed within __exit__ (C++ doesn't allow it)")
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| 276 | return
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| 277 | super().visit_raise_stmt(o)
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| 278 |
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| 279 | def oils_visit_assign_to_listcomp(self, lval: NameExpr,
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| 280 | left_expr: Expression,
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| 281 | index_expr: Expression, seq: Expression,
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| 282 | cond: Expression) -> None:
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| 283 | # We need to consider 'result' a local var:
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| 284 | # result = [x for x in other]
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| 285 |
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| 286 | # what about yield accumulator, like
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| 287 | # it_g = g(n)
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| 288 | self.current_local_vars.append((lval.name, self._GetType(lval)))
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| 289 |
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| 290 | super().oils_visit_assign_to_listcomp(lval, left_expr, index_expr, seq,
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| 291 | cond)
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| 292 |
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| 293 | def _MaybeAddMember(self, lval: MemberExpr,
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| 294 | current_method_name: Optional[str],
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| 295 | at_global_scope: bool) -> None:
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| 296 | assert not at_global_scope, "Members shouldn't be assigned at the top level"
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| 297 |
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| 298 | # Collect statements that look like self.foo = 1
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| 299 | # Only do this in __init__ so that a derived class mutating a field
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| 300 | # from the base class doesn't cause duplicate C++ fields. (C++
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| 301 | # allows two fields of the same name!)
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| 302 | #
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| 303 | # HACK for WordParser: also include Reset(). We could change them
|
| 304 | # all up front but I kinda like this.
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| 305 | if current_method_name not in ('__init__', 'Reset'):
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| 306 | return
|
| 307 |
|
| 308 | if isinstance(lval.expr, NameExpr) and lval.expr.name == 'self':
|
| 309 | #log(' lval.name %s', lval.name)
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| 310 | lval_type = self._GetType(lval)
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| 311 | c_type = cppgen_pass.GetCType(lval_type)
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| 312 | is_managed = cppgen_pass.CTypeIsManaged(c_type)
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| 313 | self.current_member_vars[lval.name] = (lval_type, c_type,
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| 314 | is_managed)
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| 315 |
|
| 316 | def oils_visit_assignment_stmt(self, o: 'mypy.nodes.AssignmentStmt',
|
| 317 | lval: Expression, rval: Expression,
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| 318 | current_method_name: Optional[str],
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| 319 | at_global_scope: bool) -> None:
|
| 320 |
|
| 321 | if isinstance(lval, MemberExpr):
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| 322 | self._MaybeAddMember(lval, current_method_name, at_global_scope)
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| 323 |
|
| 324 | # TupleExpr will not be in self.types
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| 325 | t = self._GetTypeOptional(lval) # type: Optional[Type]
|
| 326 | if isinstance(t, PartialType):
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| 327 | self.report_error(
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| 328 | o,
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| 329 | "Mismatched types: trying to assign expression of type '%s' to "
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| 330 | "a PartialType variable '%s' (was likely assigned None before).\n"
|
| 331 | "Tip: If your type translates to a heap-allocated type (e.g. str "
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| 332 | "or class), you can annotate it with '# type: Optional[T]'. "
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| 333 | "If your type is allocated on the stack (int), then you can use "
|
| 334 | "-1 or similar as an in-band null value" %
|
| 335 | (t.var.type.type.name, t.var.name))
|
| 336 | return
|
| 337 |
|
| 338 | # Handle:
|
| 339 | # x = y
|
| 340 | # These two are special cases in cppgen_pass, but not here
|
| 341 | # x = NewDict()
|
| 342 | # x = cast(T, y)
|
| 343 | #
|
| 344 | # Note: this has duplicates: the 'done' set in visit_block() handles
|
| 345 | # it. Could make it a Dict.
|
| 346 | if isinstance(lval, NameExpr):
|
| 347 | rval_type = self._GetType(rval)
|
| 348 |
|
| 349 | # Two pieces of logic adapted from cppgen_pass: is_iterator and is_cast.
|
| 350 | # Can we simplify them?
|
| 351 |
|
| 352 | is_iterator = (isinstance(rval_type, Instance) and
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| 353 | rval_type.type.fullname == 'typing.Iterator')
|
| 354 |
|
| 355 | # Downcasted vars are BLOCK-scoped, not FUNCTION-scoped, so they
|
| 356 | # don't become local vars. They are also ALIASED, so they don't
|
| 357 | # need to be rooted.
|
| 358 | is_downcast_and_shadow = False
|
| 359 | if (isinstance(rval, CallExpr) and
|
| 360 | isinstance(rval.callee, NameExpr) and
|
| 361 | rval.callee.name == 'cast'):
|
| 362 | to_cast = rval.args[1]
|
| 363 | if (isinstance(to_cast, NameExpr) and
|
| 364 | to_cast.name.startswith('UP_')):
|
| 365 | is_downcast_and_shadow = True
|
| 366 |
|
| 367 | if (not at_global_scope and not is_iterator and
|
| 368 | not is_downcast_and_shadow):
|
| 369 | self.current_local_vars.append((lval.name, self._GetType(lval)))
|
| 370 |
|
| 371 | # Handle local vars, like _write_tuple_unpacking
|
| 372 |
|
| 373 | # This handles:
|
| 374 | # a, b = func_that_returns_tuple()
|
| 375 | if isinstance(lval, TupleExpr):
|
| 376 | if isinstance(rval, TupleExpr):
|
| 377 | self.report_error(
|
| 378 | o, "mycpp currently does not handle code like "
|
| 379 | "'a, b = x, y'. You can move each assignment to its own line "
|
| 380 | "or return (x, y) from a function instead.")
|
| 381 | return
|
| 382 |
|
| 383 | rval_type = self._GetType(rval)
|
| 384 | assert isinstance(rval_type, TupleType), rval_type
|
| 385 |
|
| 386 | for i, (lval_item,
|
| 387 | item_type) in enumerate(zip(lval.items, rval_type.items)):
|
| 388 | #self.log('*** %s :: %s', lval_item, item_type)
|
| 389 | if isinstance(lval_item, NameExpr):
|
| 390 | if util.SkipAssignment(lval_item.name):
|
| 391 | continue
|
| 392 | self.current_local_vars.append((lval_item.name, item_type))
|
| 393 |
|
| 394 | # self.a, self.b = foo()
|
| 395 | if isinstance(lval_item, MemberExpr):
|
| 396 | self._MaybeAddMember(lval_item, current_method_name,
|
| 397 | at_global_scope)
|
| 398 |
|
| 399 | super().oils_visit_assignment_stmt(o, lval, rval, current_method_name,
|
| 400 | at_global_scope)
|
| 401 |
|
| 402 | def oils_visit_for_stmt(self, o: 'mypy.nodes.ForStmt',
|
| 403 | func_name: Optional[str]) -> None:
|
| 404 | # TODO: this variable should be BLOCK scoped, not function scoped, like
|
| 405 | # the tuple variables for i, x
|
| 406 | index0_name: Optional[str] = None
|
| 407 | if func_name == 'enumerate':
|
| 408 | assert isinstance(o.index, TupleExpr), o.index
|
| 409 | index0 = o.index.items[0]
|
| 410 | assert isinstance(index0, NameExpr), index0
|
| 411 | index0_name = index0.name # generate int i = 0; ; ++i
|
| 412 |
|
| 413 | if index0_name:
|
| 414 | # can't initialize two things in a for loop, so do it on a separate line
|
| 415 | self.current_local_vars.append((index0_name, MYCPP_INT))
|
| 416 |
|
| 417 | super().oils_visit_for_stmt(o, func_name)
|