| 1 | """
|
| 2 | control_flow_pass.py - AST pass that builds a control flow graph.
|
| 3 | """
|
| 4 | import collections
|
| 5 | from typing import overload, Union, Optional, Dict
|
| 6 |
|
| 7 | import mypy
|
| 8 | from mypy.nodes import (Block, Expression, Statement, ExpressionStmt, StrExpr,
|
| 9 | CallExpr, FuncDef, IfStmt, NameExpr, MemberExpr,
|
| 10 | IndexExpr, TupleExpr, IntExpr)
|
| 11 |
|
| 12 | from mypy.types import CallableType, Instance, Type, UnionType, NoneTyp, TupleType
|
| 13 |
|
| 14 | from mycpp.crash import catch_errors
|
| 15 | from mycpp.util import join_name, split_py_name
|
| 16 | from mycpp.visitor import SimpleVisitor, T
|
| 17 | from mycpp import util
|
| 18 | from mycpp import pass_state
|
| 19 |
|
| 20 |
|
| 21 | class UnsupportedException(Exception):
|
| 22 | pass
|
| 23 |
|
| 24 |
|
| 25 | def GetObjectTypeName(t: Type) -> util.SymbolPath:
|
| 26 | if isinstance(t, Instance):
|
| 27 | return split_py_name(t.type.fullname)
|
| 28 |
|
| 29 | elif isinstance(t, UnionType):
|
| 30 | assert len(t.items) == 2
|
| 31 | if isinstance(t.items[0], NoneTyp):
|
| 32 | return GetObjectTypeName(t.items[1])
|
| 33 |
|
| 34 | return GetObjectTypeName(t.items[0])
|
| 35 |
|
| 36 | assert False, t
|
| 37 |
|
| 38 |
|
| 39 | class Build(SimpleVisitor):
|
| 40 |
|
| 41 | def __init__(self, types: Dict[Expression, Type], virtual, local_vars,
|
| 42 | dot_exprs):
|
| 43 |
|
| 44 | self.types = types
|
| 45 | self.cfgs = collections.defaultdict(pass_state.ControlFlowGraph)
|
| 46 | self.current_statement_id = None
|
| 47 | self.current_class_name = None
|
| 48 | self.current_func_node = None
|
| 49 | self.loop_stack = []
|
| 50 | self.virtual = virtual
|
| 51 | self.local_vars = local_vars
|
| 52 | self.dot_exprs = dot_exprs
|
| 53 | self.heap_counter = 0
|
| 54 | self.callees = {} # statement object -> SymbolPath of the callee
|
| 55 | self.current_lval = None
|
| 56 |
|
| 57 | def current_cfg(self):
|
| 58 | if not self.current_func_node:
|
| 59 | return None
|
| 60 |
|
| 61 | return self.cfgs[split_py_name(self.current_func_node.fullname)]
|
| 62 |
|
| 63 | def resolve_callee(self, o: CallExpr) -> Optional[util.SymbolPath]:
|
| 64 | """
|
| 65 | Returns the fully qualified name of the callee in the given call
|
| 66 | expression.
|
| 67 |
|
| 68 | Member functions are prefixed by the names of the classes that contain
|
| 69 | them. For example, the name of the callee in the last statement of the
|
| 70 | snippet below is `module.SomeObject.Foo`.
|
| 71 |
|
| 72 | x = module.SomeObject()
|
| 73 | x.Foo()
|
| 74 |
|
| 75 | Free-functions defined in the local module are referred to by their
|
| 76 | normal fully qualified names. The function `foo` in a module called
|
| 77 | `moduleA` would is named `moduleA.foo`. Calls to free-functions defined
|
| 78 | in imported modules are named the same way.
|
| 79 | """
|
| 80 |
|
| 81 | if isinstance(o.callee, NameExpr):
|
| 82 | return split_py_name(o.callee.fullname)
|
| 83 |
|
| 84 | elif isinstance(o.callee, MemberExpr):
|
| 85 | if isinstance(o.callee.expr, NameExpr):
|
| 86 | is_module = isinstance(self.dot_exprs.get(o.callee),
|
| 87 | pass_state.ModuleMember)
|
| 88 | if is_module:
|
| 89 | return split_py_name(
|
| 90 | o.callee.expr.fullname) + (o.callee.name, )
|
| 91 |
|
| 92 | elif o.callee.expr.name == 'self':
|
| 93 | assert self.current_class_name
|
| 94 | return self.current_class_name + (o.callee.name, )
|
| 95 |
|
| 96 | else:
|
| 97 | local_type = None
|
| 98 | for name, t in self.local_vars.get(self.current_func_node,
|
| 99 | []):
|
| 100 | if name == o.callee.expr.name:
|
| 101 | local_type = t
|
| 102 | break
|
| 103 |
|
| 104 | if local_type:
|
| 105 | if isinstance(local_type, str):
|
| 106 | return split_py_name(local_type) + (
|
| 107 | o.callee.name, )
|
| 108 |
|
| 109 | elif isinstance(local_type, Instance):
|
| 110 | return split_py_name(
|
| 111 | local_type.type.fullname) + (o.callee.name, )
|
| 112 |
|
| 113 | elif isinstance(local_type, UnionType):
|
| 114 | assert len(local_type.items) == 2
|
| 115 | return split_py_name(
|
| 116 | local_type.items[0].type.fullname) + (
|
| 117 | o.callee.expr.name, )
|
| 118 |
|
| 119 | else:
|
| 120 | assert not isinstance(local_type, CallableType)
|
| 121 | # primitive type or string. don't care.
|
| 122 | return None
|
| 123 |
|
| 124 | else:
|
| 125 | # context or exception handler. probably safe to ignore.
|
| 126 | return None
|
| 127 |
|
| 128 | else:
|
| 129 | t = self.types.get(o.callee.expr)
|
| 130 | if isinstance(t, Instance):
|
| 131 | return split_py_name(t.type.fullname) + (o.callee.name, )
|
| 132 |
|
| 133 | elif isinstance(t, UnionType):
|
| 134 | assert len(t.items) == 2
|
| 135 | return split_py_name(
|
| 136 | t.items[0].type.fullname) + (o.callee.name, )
|
| 137 |
|
| 138 | elif o.callee.expr and getattr(o.callee.expr, 'fullname',
|
| 139 | None):
|
| 140 | return split_py_name(
|
| 141 | o.callee.expr.fullname) + (o.callee.name, )
|
| 142 |
|
| 143 | else:
|
| 144 | # constructors of things that we don't care about.
|
| 145 | return None
|
| 146 |
|
| 147 | # Don't currently get here
|
| 148 | raise AssertionError()
|
| 149 |
|
| 150 | def get_ref_name(self, expr: Expression) -> Optional[util.SymbolPath]:
|
| 151 | """
|
| 152 | To do dataflow analysis we need to track changes to objects, which
|
| 153 | requires naming them. This function returns the name of the object
|
| 154 | referred to by the given expression. If the expression doesn't refer to
|
| 155 | an object or variable it returns None.
|
| 156 |
|
| 157 | Objects are named slightly differently than they appear in the source
|
| 158 | code.
|
| 159 |
|
| 160 | Objects referenced by local variables are referred to by the name of the
|
| 161 | local. For example, the name of the object in both statements below is
|
| 162 | `x`.
|
| 163 |
|
| 164 | x = module.SomeObject()
|
| 165 | x = None
|
| 166 |
|
| 167 | Member expressions are named after the parent object's type. For
|
| 168 | example, the names of the objects in the member assignment statements
|
| 169 | below are both `module.SomeObject.member_a`. This makes it possible to
|
| 170 | track data flow across object members without having to track individual
|
| 171 | heap objects, which would increase the search space for analyses and
|
| 172 | slow things down.
|
| 173 |
|
| 174 | x = module.SomeObject()
|
| 175 | y = module.SomeObject()
|
| 176 | x.member_a = 'foo'
|
| 177 | y.member_a = 'bar'
|
| 178 |
|
| 179 | Index expressions are named after their bases, for the same reasons as
|
| 180 | member expressions. The coarse-grained precision should lead to an
|
| 181 | over-approximation of where objects are in use, but should not miss any
|
| 182 | references. This should be fine for our purposes. In the snippet below
|
| 183 | the last two assignments are named `x` and `module.SomeObject.a_list`.
|
| 184 |
|
| 185 | x = [None] # list[Thing]
|
| 186 | y = module.SomeObject()
|
| 187 | x[0] = Thing()
|
| 188 | y.a_list[1] = Blah()
|
| 189 |
|
| 190 | Index expressions over tuples are treated differently, though. Tuples
|
| 191 | have a fixed size, tend to be small, and their elements have distinct
|
| 192 | types. So, each element can be (and probably needs to be) individually
|
| 193 | named. In the snippet below, the name of the RHS in the second
|
| 194 | assignment is `t.0`.
|
| 195 |
|
| 196 | t = (1, 2, 3, 4)
|
| 197 | x = t[0]
|
| 198 |
|
| 199 | The examples above all deal with assignments, but these rules apply to
|
| 200 | any expression that uses an object or variable.
|
| 201 | """
|
| 202 | if isinstance(expr,
|
| 203 | NameExpr) and expr.name not in {'True', 'False', 'None'}:
|
| 204 | return (expr.name, )
|
| 205 |
|
| 206 | elif isinstance(expr, MemberExpr):
|
| 207 | dot_expr = self.dot_exprs[expr]
|
| 208 | if isinstance(dot_expr, pass_state.ModuleMember):
|
| 209 | return dot_expr.module_path + (dot_expr.member, )
|
| 210 |
|
| 211 | elif isinstance(dot_expr, pass_state.HeapObjectMember):
|
| 212 | obj_name = self.get_ref_name(dot_expr.object_expr)
|
| 213 | if obj_name:
|
| 214 | # XXX: add a new case like pass_state.ExpressionMember for
|
| 215 | # cases when the LHS of . isn't a reference (e.g.
|
| 216 | # builtin/assign_osh.py:54)
|
| 217 | return obj_name + (dot_expr.member, )
|
| 218 |
|
| 219 | elif isinstance(dot_expr, pass_state.StackObjectMember):
|
| 220 | return self.get_ref_name(
|
| 221 | dot_expr.object_expr) + (dot_expr.member, )
|
| 222 |
|
| 223 | elif isinstance(expr, IndexExpr):
|
| 224 | if isinstance(self.types[expr.base], TupleType):
|
| 225 | assert isinstance(expr.index, IntExpr)
|
| 226 | return self.get_ref_name(expr.base) + (str(expr.index.value), )
|
| 227 |
|
| 228 | return self.get_ref_name(expr.base)
|
| 229 |
|
| 230 | return None
|
| 231 |
|
| 232 | #
|
| 233 | # COPIED from IRBuilder
|
| 234 | #
|
| 235 |
|
| 236 | @overload
|
| 237 | def accept(self, node: Expression) -> T:
|
| 238 | ...
|
| 239 |
|
| 240 | @overload
|
| 241 | def accept(self, node: Statement) -> None:
|
| 242 | ...
|
| 243 |
|
| 244 | def accept(self, node: Union[Statement, Expression]) -> Optional[T]:
|
| 245 | with catch_errors(self.module_path, node.line):
|
| 246 | if isinstance(node, Expression):
|
| 247 | try:
|
| 248 | res = node.accept(self)
|
| 249 | #res = self.coerce(res, self.node_type(node), node.line)
|
| 250 |
|
| 251 | # If we hit an error during compilation, we want to
|
| 252 | # keep trying, so we can produce more error
|
| 253 | # messages. Generate a temp of the right type to keep
|
| 254 | # from causing more downstream trouble.
|
| 255 | except UnsupportedException:
|
| 256 | res = self.alloc_temp(self.node_type(node))
|
| 257 | return res
|
| 258 | else:
|
| 259 | try:
|
| 260 | cfg = self.current_cfg()
|
| 261 | # Most statements have empty visitors because they don't
|
| 262 | # require any special logic. Create statements for them
|
| 263 | # here. Don't create statements from blocks to avoid
|
| 264 | # stuttering.
|
| 265 | if cfg and not isinstance(node, Block):
|
| 266 | self.current_statement_id = cfg.AddStatement()
|
| 267 |
|
| 268 | node.accept(self)
|
| 269 | except UnsupportedException:
|
| 270 | pass
|
| 271 | return None
|
| 272 |
|
| 273 | # Not in superclasses:
|
| 274 |
|
| 275 | def visit_mypy_file(self, o: 'mypy.nodes.MypyFile') -> T:
|
| 276 | if util.ShouldSkipPyFile(o):
|
| 277 | return
|
| 278 |
|
| 279 | self.module_path = o.path
|
| 280 |
|
| 281 | for node in o.defs:
|
| 282 | # skip module docstring
|
| 283 | if isinstance(node, ExpressionStmt) and isinstance(
|
| 284 | node.expr, StrExpr):
|
| 285 | continue
|
| 286 | self.accept(node)
|
| 287 |
|
| 288 | # Statements
|
| 289 |
|
| 290 | def visit_for_stmt(self, o: 'mypy.nodes.ForStmt') -> T:
|
| 291 | cfg = self.current_cfg()
|
| 292 | with pass_state.CfgLoopContext(
|
| 293 | cfg, entry=self.current_statement_id) as loop:
|
| 294 | self.accept(o.expr)
|
| 295 | self.loop_stack.append(loop)
|
| 296 | self.accept(o.body)
|
| 297 | self.loop_stack.pop()
|
| 298 |
|
| 299 | def _handle_switch(self, expr, o, cfg):
|
| 300 | assert len(o.body.body) == 1, o.body.body
|
| 301 | if_node = o.body.body[0]
|
| 302 | assert isinstance(if_node, IfStmt), if_node
|
| 303 | cases = []
|
| 304 | default_block = util._collect_cases(self.module_path, if_node, cases)
|
| 305 | with pass_state.CfgBranchContext(
|
| 306 | cfg, self.current_statement_id) as branch_ctx:
|
| 307 | for expr, body in cases:
|
| 308 | self.accept(expr)
|
| 309 | assert expr is not None, expr
|
| 310 | with branch_ctx.AddBranch():
|
| 311 | self.accept(body)
|
| 312 |
|
| 313 | if default_block:
|
| 314 | with branch_ctx.AddBranch():
|
| 315 | self.accept(default_block)
|
| 316 |
|
| 317 | def visit_with_stmt(self, o: 'mypy.nodes.WithStmt') -> T:
|
| 318 | cfg = self.current_cfg()
|
| 319 | assert len(o.expr) == 1, o.expr
|
| 320 | expr = o.expr[0]
|
| 321 | assert isinstance(expr, CallExpr), expr
|
| 322 | self.accept(expr)
|
| 323 |
|
| 324 | callee_name = expr.callee.name
|
| 325 | if callee_name == 'switch':
|
| 326 | self._handle_switch(expr, o, cfg)
|
| 327 | elif callee_name == 'str_switch':
|
| 328 | self._handle_switch(expr, o, cfg)
|
| 329 | elif callee_name == 'tagswitch':
|
| 330 | self._handle_switch(expr, o, cfg)
|
| 331 | else:
|
| 332 | with pass_state.CfgBlockContext(cfg, self.current_statement_id):
|
| 333 | self.accept(o.body)
|
| 334 |
|
| 335 | def visit_func_def(self, o: 'mypy.nodes.FuncDef') -> T:
|
| 336 | if o.name == '__repr__': # Don't translate
|
| 337 | return
|
| 338 |
|
| 339 | # For virtual methods, pretend that the method on the base class calls
|
| 340 | # the same method on every subclass. This way call sites using the
|
| 341 | # abstract base class will over-approximate the set of call paths they
|
| 342 | # can take when checking if they can reach MaybeCollect().
|
| 343 | if self.current_class_name and self.virtual.IsVirtual(
|
| 344 | self.current_class_name, o.name):
|
| 345 | key = (self.current_class_name, o.name)
|
| 346 | base = self.virtual.virtuals[key]
|
| 347 | if base:
|
| 348 | sub = join_name(self.current_class_name + (o.name, ),
|
| 349 | delim='.')
|
| 350 | base_key = base[0] + (base[1], )
|
| 351 | cfg = self.cfgs[base_key]
|
| 352 | cfg.AddFact(0, pass_state.FunctionCall(sub))
|
| 353 |
|
| 354 | self.current_func_node = o
|
| 355 | cfg = self.current_cfg()
|
| 356 | for arg in o.arguments:
|
| 357 | cfg.AddFact(0,
|
| 358 | pass_state.Definition((arg.variable.name, ), '$Empty'))
|
| 359 |
|
| 360 | self.accept(o.body)
|
| 361 | self.current_func_node = None
|
| 362 | self.current_statement_id = None
|
| 363 |
|
| 364 | def visit_class_def(self, o: 'mypy.nodes.ClassDef') -> T:
|
| 365 | self.current_class_name = split_py_name(o.fullname)
|
| 366 | for stmt in o.defs.body:
|
| 367 | # Ignore things that look like docstrings
|
| 368 | if (isinstance(stmt, ExpressionStmt) and
|
| 369 | isinstance(stmt.expr, StrExpr)):
|
| 370 | continue
|
| 371 |
|
| 372 | if isinstance(stmt, FuncDef) and stmt.name == '__repr__':
|
| 373 | continue
|
| 374 |
|
| 375 | self.accept(stmt)
|
| 376 |
|
| 377 | self.current_class_name = None
|
| 378 |
|
| 379 | def visit_while_stmt(self, o: 'mypy.nodes.WhileStmt') -> T:
|
| 380 | cfg = self.current_cfg()
|
| 381 | with pass_state.CfgLoopContext(
|
| 382 | cfg, entry=self.current_statement_id) as loop:
|
| 383 | self.accept(o.expr)
|
| 384 | self.loop_stack.append(loop)
|
| 385 | self.accept(o.body)
|
| 386 | self.loop_stack.pop()
|
| 387 |
|
| 388 | def visit_return_stmt(self, o: 'mypy.nodes.ReturnStmt') -> T:
|
| 389 | cfg = self.current_cfg()
|
| 390 | if cfg:
|
| 391 | cfg.AddDeadend(self.current_statement_id)
|
| 392 |
|
| 393 | if o.expr:
|
| 394 | self.accept(o.expr)
|
| 395 |
|
| 396 | def visit_if_stmt(self, o: 'mypy.nodes.IfStmt') -> T:
|
| 397 | cfg = self.current_cfg()
|
| 398 |
|
| 399 | if util.ShouldVisitIfExpr(o):
|
| 400 | for expr in o.expr:
|
| 401 | self.accept(expr)
|
| 402 |
|
| 403 | with pass_state.CfgBranchContext(
|
| 404 | cfg, self.current_statement_id) as branch_ctx:
|
| 405 | if util.ShouldVisitIfBody(o):
|
| 406 | with branch_ctx.AddBranch():
|
| 407 | for node in o.body:
|
| 408 | self.accept(node)
|
| 409 |
|
| 410 | if util.ShouldVisitElseBody(o):
|
| 411 | with branch_ctx.AddBranch():
|
| 412 | self.accept(o.else_body)
|
| 413 |
|
| 414 | def visit_break_stmt(self, o: 'mypy.nodes.BreakStmt') -> T:
|
| 415 | if len(self.loop_stack):
|
| 416 | self.loop_stack[-1].AddBreak(self.current_statement_id)
|
| 417 |
|
| 418 | def visit_continue_stmt(self, o: 'mypy.nodes.ContinueStmt') -> T:
|
| 419 | if len(self.loop_stack):
|
| 420 | self.loop_stack[-1].AddContinue(self.current_statement_id)
|
| 421 |
|
| 422 | def visit_raise_stmt(self, o: 'mypy.nodes.RaiseStmt') -> T:
|
| 423 | cfg = self.current_cfg()
|
| 424 | if cfg:
|
| 425 | cfg.AddDeadend(self.current_statement_id)
|
| 426 |
|
| 427 | if o.expr:
|
| 428 | self.accept(o.expr)
|
| 429 |
|
| 430 | def visit_try_stmt(self, o: 'mypy.nodes.TryStmt') -> T:
|
| 431 | cfg = self.current_cfg()
|
| 432 | with pass_state.CfgBranchContext(cfg,
|
| 433 | self.current_statement_id) as try_ctx:
|
| 434 | with try_ctx.AddBranch() as try_block:
|
| 435 | self.accept(o.body)
|
| 436 |
|
| 437 | for t, v, handler in zip(o.types, o.vars, o.handlers):
|
| 438 | with try_ctx.AddBranch(try_block.exit):
|
| 439 | self.accept(handler)
|
| 440 |
|
| 441 | def visit_assignment_stmt(self, o: 'mypy.nodes.AssignmentStmt') -> T:
|
| 442 | cfg = self.current_cfg()
|
| 443 | if cfg:
|
| 444 | assert len(o.lvalues) == 1
|
| 445 | lval = o.lvalues[0]
|
| 446 | lval_names = []
|
| 447 | if isinstance(lval, TupleExpr):
|
| 448 | lval_names.extend(
|
| 449 | [self.get_ref_name(item) for item in lval.items])
|
| 450 |
|
| 451 | else:
|
| 452 | lval_names.append(self.get_ref_name(lval))
|
| 453 |
|
| 454 | assert lval_names, o
|
| 455 |
|
| 456 | rval_type = self.types[o.rvalue]
|
| 457 | rval_names = []
|
| 458 | if isinstance(o.rvalue, CallExpr):
|
| 459 | # The RHS is either an object constructor or something that
|
| 460 | # returns a primitive type (e.g. Tuple[int, int] or str).
|
| 461 | # XXX: When we add inter-procedural analysis we should treat
|
| 462 | # these not as definitions but as some new kind of assignment.
|
| 463 | rval_names = [None for _ in lval_names]
|
| 464 |
|
| 465 | elif isinstance(o.rvalue, TupleExpr) and len(lval_names) == 1:
|
| 466 | # We're constructing a tuple. Since tuples have have a fixed
|
| 467 | # (and usually small) size, we can name each of the
|
| 468 | # elements.
|
| 469 | base = lval_names[0]
|
| 470 | lval_names = [
|
| 471 | base + (str(i), ) for i in range(len(o.rvalue.items))
|
| 472 | ]
|
| 473 | rval_names = [
|
| 474 | self.get_ref_name(item) for item in o.rvalue.items
|
| 475 | ]
|
| 476 |
|
| 477 | elif isinstance(rval_type, TupleType):
|
| 478 | # We're unpacking a tuple. Like the tuple construction case,
|
| 479 | # give each element a name.
|
| 480 | rval_name = self.get_ref_name(o.rvalue)
|
| 481 | assert rval_name, o.rvalue
|
| 482 | rval_names = [
|
| 483 | rval_name + (str(i), ) for i in range(len(lval_names))
|
| 484 | ]
|
| 485 |
|
| 486 | else:
|
| 487 | rval_names = [self.get_ref_name(o.rvalue)]
|
| 488 |
|
| 489 | assert len(rval_names) == len(lval_names)
|
| 490 |
|
| 491 | for lhs, rhs in zip(lval_names, rval_names):
|
| 492 | assert lhs, lval
|
| 493 | if rhs:
|
| 494 | # In this case rhe RHS is another variable. Record the
|
| 495 | # assignment so we can keep track of aliases.
|
| 496 | cfg.AddFact(self.current_statement_id,
|
| 497 | pass_state.Assignment(lhs, rhs))
|
| 498 | else:
|
| 499 | # In this case the RHS is either some kind of literal (e.g.
|
| 500 | # [] or 'foo') or a call to an object constructor. Mark this
|
| 501 | # statement as an (re-)definition of a variable.
|
| 502 | cfg.AddFact(
|
| 503 | self.current_statement_id,
|
| 504 | pass_state.Definition(
|
| 505 | lhs, '$HeapObject(h{})'.format(self.heap_counter)),
|
| 506 | )
|
| 507 | self.heap_counter += 1
|
| 508 |
|
| 509 | for lval in o.lvalues:
|
| 510 | self.current_lval = lval
|
| 511 | self.accept(lval)
|
| 512 | self.current_lval = None
|
| 513 |
|
| 514 | self.accept(o.rvalue)
|
| 515 |
|
| 516 | # Expressions
|
| 517 |
|
| 518 | def visit_member_expr(self, o: 'mypy.nodes.MemberExpr') -> T:
|
| 519 | self.accept(o.expr)
|
| 520 | cfg = self.current_cfg()
|
| 521 | if cfg and not isinstance(
|
| 522 | self.dot_exprs[o],
|
| 523 | pass_state.ModuleMember) and o != self.current_lval:
|
| 524 | ref = self.get_ref_name(o)
|
| 525 | if ref:
|
| 526 | cfg.AddFact(self.current_statement_id, pass_state.Use(ref))
|
| 527 |
|
| 528 | def visit_name_expr(self, o: 'mypy.nodes.NameExpr') -> T:
|
| 529 | cfg = self.current_cfg()
|
| 530 | if cfg and o != self.current_lval:
|
| 531 | is_local = False
|
| 532 | for name, t in self.local_vars.get(self.current_func_node, []):
|
| 533 | if name == o.name:
|
| 534 | is_local = True
|
| 535 | break
|
| 536 |
|
| 537 | ref = self.get_ref_name(o)
|
| 538 | if ref and is_local:
|
| 539 | cfg.AddFact(self.current_statement_id, pass_state.Use(ref))
|
| 540 |
|
| 541 | def visit_call_expr(self, o: 'mypy.nodes.CallExpr') -> T:
|
| 542 | cfg = self.current_cfg()
|
| 543 | if self.current_func_node:
|
| 544 | full_callee = self.resolve_callee(o)
|
| 545 | if full_callee:
|
| 546 | self.callees[o] = full_callee
|
| 547 | cfg.AddFact(
|
| 548 | self.current_statement_id,
|
| 549 | pass_state.FunctionCall(join_name(full_callee, delim='.')))
|
| 550 |
|
| 551 | self.accept(o.callee)
|
| 552 | for arg in o.args:
|
| 553 | self.accept(arg)
|