1 #!/usr/bin/env python 2 3 """ 4 Inspect source files, obtaining details of classes and attributes. 5 6 Copyright (C) 2007, 2008, 2009, 2010, 2011 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 21 -------- 22 23 The results of inspecting a module are as follows: 24 25 Constants 26 --------- 27 28 All constants identified within the code shall be registered. 29 30 Classes 31 ------- 32 33 All global classes shall be registered; local classes (within functions) or 34 nested classes (within classes) are not currently registered. 35 36 Base classes must be detected and constant. 37 38 All classes without bases are made to inherit from __builtins__.object in order 39 to support some standard methods. 40 41 Functions 42 --------- 43 44 All functions and lambda definitions shall be registered. 45 46 Namespaces 47 ---------- 48 49 Modules define their own "global" namespace, within which classes, functions 50 and lambda definitions establish a hierarchy of namespaces. 51 52 Only local, global and built-in namespaces are recognised; closures are not 53 supported. 54 55 Assignments 56 ----------- 57 58 Name assignment and attribute assignment involving modules and classes cause 59 names to be associated with values within namespaces. 60 61 Any assignments within loops are considered to cause the targets of such 62 assignments to provide non-constant values. 63 64 Assignments to names are only really considered to cause the targets of such 65 assignments to provide constant values if the targets reside in the module 66 namespace or in class namespaces, subject to the above conditions. 67 68 Assignments to names within functions are not generally considered to cause the 69 targets of such assignments to provide constant values since functions can be 70 invoked many times with different inputs. This affects particularly the 71 definition of functions or lambdas within functions. However, there may be 72 benefits in considering a local to be constant within a single invocation. 73 """ 74 75 from micropython.common import * 76 from micropython.data import * 77 import compiler.ast 78 79 # Program visitors. 80 81 class InspectedModule(ASTVisitor, Module): 82 83 """ 84 An inspected module, providing core details via the Module superclass, but 85 capable of being used as an AST visitor. 86 """ 87 88 def __init__(self, name, importer): 89 90 """ 91 Initialise this visitor with a module 'name' and an 'importer' which is 92 used to provide access to other modules when required. 93 """ 94 95 ASTVisitor.__init__(self) 96 Module.__init__(self, name, importer) 97 self.visitor = self 98 99 # Import machinery links. 100 101 self.optimisations = self.importer.optimisations 102 self.builtins = self.importer.modules.get("__builtins__") 103 self.loaded = 0 104 105 # Current expression state. 106 107 self.expr = None 108 self.in_assignment = 0 # For slice and subscript handling. 109 110 # Namespace state. 111 112 self.in_method = 0 # Find instance attributes in all methods. 113 self.in_function = 0 # Note function presence, affecting definitions. 114 self.in_loop = 0 # Note loop "membership", affecting assignments. 115 self.namespaces = [] 116 self.functions = [] 117 118 def parse(self, filename): 119 120 "Parse the file having the given 'filename'." 121 122 module = compiler.parseFile(filename) 123 self.process(module) 124 125 def process(self, module): 126 127 "Process the given 'module'." 128 129 self.astnode = module 130 131 # Add __name__ to the namespace by adding an explicit assignment to the 132 # module. 133 134 module.node.nodes.insert(0, compiler.ast.Assign( 135 [compiler.ast.AssName("__name__", 0)], 136 compiler.ast.Const(self.full_name()) 137 )) 138 139 # First, visit module-level code, recording global names. 140 141 processed = self.dispatch(module) 142 143 # Then, for each function, detect and record globals declared in those 144 # functions. 145 146 for node, namespaces in self.functions: 147 self.process_globals(node) 148 149 self.finalise_attribute_usage() 150 151 # Then, visit each function, recording other names. 152 153 for node, namespaces in self.functions: 154 self._visitFunctionBody(node, namespaces) 155 namespaces[-1].finalise_attribute_usage() 156 157 # Add references to other modules declared using the __all__ global. 158 159 if self.has_key("__all__"): 160 all = self["__all__"] 161 if isinstance(all, compiler.ast.List): 162 for n in all.nodes: 163 self.store(n.value, self.importer.add_module(self.name + "." + n.value)) 164 165 return processed 166 167 def process_globals(self, node): 168 169 """ 170 Within the given 'node', process global declarations, adjusting the 171 module namespace. 172 """ 173 174 for n in node.getChildNodes(): 175 if isinstance(n, compiler.ast.Global): 176 for name in n.names: 177 if not self.has_key(name): 178 self[name] = None 179 else: 180 self.process_globals(n) 181 182 def vacuum(self): 183 184 """ 185 Vacuum the module namespace, removing unreferenced objects and unused 186 names. 187 """ 188 189 if self.should_optimise_unused_objects(): 190 self.vacuum_object(self) 191 192 all_objects = list(self.all_objects) 193 194 for obj in all_objects: 195 self.vacuum_object(obj) 196 197 def vacuum_object(self, obj, delete_all=0): 198 199 "Vacuum the given object 'obj'." 200 201 for name, attr in obj.items_for_vacuum(): 202 203 # Only consider deleting entire unused objects or things accessible 204 # via names which are never used. 205 206 if delete_all or not self.importer.uses_attribute(obj.full_name(), name): 207 obj.vacuum_item(name) 208 209 # Delete any unambiguous attribute value. Such values can only 210 # have been defined within the object and therefore are not 211 # redefined by other code regions. 212 213 if attr is not None and attr.assignments == 1: 214 value = attr.get_value() 215 216 # The value must have this object as a parent. 217 218 if value is not obj and value.parent is obj and value in self.all_objects: 219 self.all_objects.remove(value) 220 221 # Delete class contents and lambdas from functions. 222 223 self.vacuum_object(value, 1) 224 225 def unfinalise(self): 226 227 "Reset finalised information for the module." 228 229 for obj in self.all_objects: 230 obj.unfinalise_attributes() 231 232 def finalise(self): 233 234 "Finalise the module." 235 236 for obj in self.all_objects: 237 obj.finalise_attributes() 238 239 def add_object(self, obj, any_scope=0): 240 241 """ 242 Record 'obj' if non-local or if the optional 'any_scope' is set to a 243 true value. 244 """ 245 246 if any_scope or not (self.namespaces and isinstance(self.namespaces[-1], Function)): 247 self.all_objects.add(obj) 248 249 # Optimisation tests. 250 251 def should_optimise_unused_objects(self): 252 return "unused_objects" in self.optimisations 253 254 # Namespace methods. 255 256 def in_class(self, namespaces=None): 257 namespaces = namespaces or self.namespaces 258 return len(namespaces) > 1 and isinstance(namespaces[-2], Class) 259 260 def store(self, name, obj): 261 262 "Record attribute or local 'name', storing 'obj'." 263 264 # Store in the module. 265 266 if not self.namespaces: 267 if self.in_loop and self.used_in_scope(name, "builtins"): 268 raise InspectError("Name %r already used as a built-in." % name) 269 else: 270 self.set(name, obj, not self.in_loop) 271 272 # Or store locally. 273 274 else: 275 locals = self.namespaces[-1] 276 277 if self.in_loop and locals.used_in_scope(name, "global") and not name in locals.globals: 278 raise InspectError("Name %r already used as global." % name) 279 elif self.in_loop and locals.used_in_scope(name, "builtins"): 280 raise InspectError("Name %r already used as a built-in." % name) 281 else: 282 locals.set(name, obj, not self.in_loop) 283 284 def store_lambda(self, obj): 285 286 "Store a lambda function 'obj'." 287 288 self.add_object(obj) 289 self.get_namespace().add_lambda(obj) 290 291 def store_module_attr(self, name, module): 292 293 """ 294 Record module attribute 'name' in the given 'module' using the current 295 expression. 296 """ 297 298 module.set(name, self.expr, 0) 299 self.use_specific_attribute(module.full_name(), name) 300 301 def store_class_attr(self, name, cls): 302 303 """ 304 Record class attribute 'name' in the given class 'cls' using the current 305 expression. 306 """ 307 308 cls.set(name, self.expr, 0) 309 self.use_specific_attribute(cls.full_name(), name) 310 311 def store_instance_attr(self, name): 312 313 "Record instance attribute 'name' in the current class." 314 315 if self.in_method: 316 317 # Current namespace is the function. 318 # Previous namespace is the class. 319 320 cls = self.namespaces[-2] 321 cls.add_instance_attribute(name) 322 323 # NOTE: The instance attribute, although defined in a specific 324 # NOTE: class, obviously appears in all descendant classes. 325 326 self.use_specific_attribute(cls.full_name(), name) 327 328 def get_namespace(self): 329 330 "Return the parent (or most recent) namespace currently exposed." 331 332 return (self.namespaces[-1:] or [self])[0] 333 334 def use_name(self, name, node=None, value=None): 335 336 """ 337 Use the given 'name' within the current namespace/unit, either in 338 conjunction with a particular object (if 'node' is specified and not 339 None) or unconditionally. 340 """ 341 342 if node is not None and isinstance(node, compiler.ast.Name): 343 self.use_attribute(node.name, name, value) 344 345 # For general name usage, declare usage of the given name from this 346 # particular unit. 347 348 else: 349 unit = self.get_namespace() 350 self.importer.use_name(name, unit.full_name(), value) 351 352 # Attribute usage methods. 353 # These are convenience methods which refer to the specific namespace's 354 # implementation of these operations. 355 356 def new_branchpoint(self, loop_node=None): 357 self.get_namespace()._new_branchpoint(loop_node) 358 359 def new_branch(self, node): 360 self.get_namespace()._new_branch(node) 361 362 def abandon_branch(self): 363 self.get_namespace()._abandon_branch() 364 365 def suspend_broken_branch(self): 366 self.get_namespace()._suspend_broken_branch() 367 368 def suspend_continuing_branch(self): 369 self.get_namespace()._suspend_continuing_branch() 370 371 def shelve_branch(self): 372 self.get_namespace()._shelve_branch() 373 374 def merge_branches(self): 375 self.get_namespace()._merge_branches() 376 377 def resume_broken_branches(self): 378 self.get_namespace()._resume_broken_branches() 379 380 def resume_continuing_branches(self): 381 self.get_namespace()._resume_continuing_branches() 382 383 def define_attribute_user(self, node): 384 385 """ 386 Define 'node' as the user of attributes, indicating the point where the 387 user is defined. 388 """ 389 390 self.get_namespace()._define_attribute_user(node) 391 392 def use_attribute(self, name, attrname, value=None): 393 394 """ 395 Note usage on the attribute user 'name' of the attribute 'attrname', 396 noting an assignment if 'value' is specified. 397 """ 398 399 return self.get_namespace()._use_attribute(name, attrname, value) 400 401 def use_specific_attribute(self, objname, attrname): 402 403 """ 404 Note usage on the object having the given 'objname' of the attribute 405 'attrname'. If 'objname' is None, the current namespace is chosen as the 406 object providing the attribute. 407 """ 408 409 return self.get_namespace()._use_specific_attribute(objname, attrname) 410 411 # Visitor methods. 412 413 def default(self, node, *args): 414 raise InspectError("Node class %r is not supported." % node.__class__) 415 416 def NOP(self, node): 417 for n in node.getChildNodes(): 418 self.dispatch(n) 419 return None 420 421 def NOP_ABANDON(self, node): 422 self.NOP(node) 423 self.abandon_branch() 424 425 def OP(self, node): 426 for n in node.getChildNodes(): 427 self.dispatch(n) 428 return Instance() 429 430 # Generic support for classes of operations. 431 432 def _ensureOperators(self): 433 attr, scope, namespace = self._get_with_scope("$operator") 434 if attr is None: 435 module = self.importer.load("operator") 436 self["$operator"] = module 437 else: 438 module = attr.get_value() 439 return module 440 441 def _visitOperator(self, node, operator_name=None): 442 443 "Accounting method for the operator 'node'." 444 445 operator_module = self._ensureOperators() 446 operator_fn = operator_functions[operator_name or node.__class__.__name__] 447 self.use_specific_attribute(operator_module.full_name(), operator_fn) 448 return self.OP(node) 449 450 _visitBinary = _visitOperator 451 _visitUnary = _visitOperator 452 453 def _visitAttr(self, expr, attrname, node): 454 455 # Attempt to identify the nature of the attribute. 456 457 if isinstance(expr, Attr): 458 value = expr.get_value() 459 460 # Get the attribute and record its usage. 461 462 if isinstance(value, (Class, Module)): 463 464 # Check for class.__class__. 465 466 if attrname == "__class__" and isinstance(value, Class): 467 attr = type_class 468 else: 469 attr = value.get(attrname) 470 self.use_specific_attribute(value.full_name(), attrname) 471 472 elif isinstance(value, UnresolvedName): 473 attr = UnresolvedName(attrname, value.full_name(), self) 474 475 else: 476 attr = None 477 478 # Note usage of the attribute where a local is involved. 479 480 self._visitAttrUser(expr, attrname, node) 481 482 elif self.builtins is not None: 483 attr = self.builtins.get(attrname) 484 self.use_specific_attribute(self.builtins.full_name(), attrname) 485 486 else: 487 attr = None 488 self.use_name(attrname, node) 489 490 return attr 491 492 def _visitAttrUser(self, expr, attrname, node, value=None): 493 494 """ 495 Note usage of the attribute provided by 'expr' with the given 'attrname' 496 where a local is involved, annotating the given 'node'. If the optional 497 'value' is given, note an assignment for future effects on attributes 498 where such attributes are inferred from the usage. 499 """ 500 501 if expr.parent is self.get_namespace(): 502 503 # NOTE: Revisiting of nodes may occur for loops. 504 505 if not hasattr(node, "_attrusers"): 506 node._attrusers = set() 507 508 node._attrusers.update(self.use_attribute(expr.name, attrname, value)) 509 node._username = expr.name 510 else: 511 self.use_name(attrname, node.expr, value) 512 513 def _visitFunction(self, node, name): 514 515 """ 516 Return a function object for the function defined by 'node' with the 517 given 'name'. If a lambda expression is being visited, 'name' should be 518 None. 519 """ 520 521 # Define the function object. 522 523 function = Function( 524 name, 525 self.get_namespace(), 526 node.argnames, 527 node.defaults, 528 (node.flags & 4 != 0), 529 (node.flags & 8 != 0), 530 self.in_loop or self.in_function, 531 self, 532 node 533 ) 534 535 self.add_object(function, any_scope=1) 536 537 # Make a back reference from the node for code generation. 538 539 node.unit = function 540 541 # Process the defaults. 542 543 for n in node.defaults: 544 self.expr = self.dispatch(n) 545 function.store_default(self.expr) 546 547 # Note attribute usage where tuple parameters are involved. 548 549 if function.tuple_parameters(): 550 self.use_name("__getitem__", node) 551 552 # Record the namespace context of the function for later processing. 553 554 self.functions.append((node, self.namespaces + [function])) 555 556 # Store the function. 557 558 if name is not None: 559 self.store(name, function) 560 else: 561 self.store_lambda(function) 562 563 # Test the defaults and assess whether an dynamic object will result. 564 565 function.make_dynamic() 566 return function 567 568 def _visitFunctionBody(self, node, namespaces): 569 570 "Enter the function." 571 572 # Current namespace is the function. 573 # Previous namespace is the class. 574 575 if self.in_class(namespaces): 576 self.in_method = 1 577 578 in_function = self.in_function 579 in_loop = self.in_loop 580 self.in_function = 1 581 self.in_loop = 0 582 583 self.namespaces = namespaces 584 self.dispatch(node.code) 585 586 self.in_loop = in_loop 587 self.in_function = in_function 588 self.in_method = 0 589 590 # Specific handler methods. 591 592 visitAdd = _visitBinary 593 594 visitAnd = OP 595 596 visitAssert = NOP 597 598 def visitAssign(self, node): 599 self.expr = self.dispatch(node.expr) 600 self.in_assignment = 1 601 for n in node.nodes: 602 self.dispatch(n) 603 self.in_assignment = 0 604 return None 605 606 def visitAssAttr(self, node): 607 expr = self.dispatch(node.expr) 608 attrname = node.attrname 609 610 # Record the attribute on the presumed target. 611 612 if isinstance(expr, Attr): 613 value = expr.get_value() 614 615 if expr.name == "self": 616 self.store_instance_attr(attrname) 617 618 elif isinstance(value, Module): 619 self.store_module_attr(attrname, value) 620 print "Warning: attribute %r of module %r set outside the module." % (node.attrname, expr.get_value().name) 621 622 elif isinstance(value, Class): 623 self.store_class_attr(attrname, value) 624 625 # Note usage of the attribute where a local is involved. 626 627 else: 628 self._visitAttrUser(expr, attrname, node, self.expr) 629 630 else: 631 self.use_name(attrname, node) 632 633 return None 634 635 def visitAssList(self, node): 636 637 # Declare names which will be used by generated code. 638 639 self.use_name("__getitem__", node) 640 641 # Process the assignment. 642 643 for i, n in enumerate(node.nodes): 644 self.dispatch(n) 645 self.importer.make_constant(i) # for __getitem__(i) at run-time 646 return None 647 648 def visitAssName(self, node): 649 if hasattr(node, "flags") and node.flags == "OP_DELETE": 650 print "Warning: deletion of attribute %r in %r is not supported." % (node.name, self.full_name()) 651 #raise InspectError("Deletion of attribute %r is not supported." % node.name) 652 653 self.store(node.name, self.expr) 654 self.define_attribute_user(node) 655 656 # Ensure the presence of the given name in this namespace. 657 # NOTE: Consider not registering assignments involving methods, since 658 # NOTE: this is merely creating aliases for such methods. 659 660 self.use_specific_attribute(None, node.name) 661 662 return None 663 664 visitAssTuple = visitAssList 665 666 def visitAugAssign(self, node): 667 668 # Accounting. 669 670 operator_fn = operator_functions.get(node.op) 671 operator_module = self._ensureOperators() 672 self.use_specific_attribute(operator_module.full_name(), operator_fn) 673 674 # Process the assignment. 675 676 self.expr = self.dispatch(node.expr) 677 678 # NOTE: Similar to micropython.ast handler code. 679 # NOTE: Slices and subscripts are supported by __setitem__(slice) and 680 # NOTE: not __setslice__. 681 682 if isinstance(node.node, compiler.ast.Name): 683 self.visitAssName(node.node) 684 elif isinstance(node.node, compiler.ast.Getattr): 685 self.visitAssAttr(node.node) 686 else: 687 self.use_specific_attribute("__builtins__", "slice") 688 self.use_name("__setitem__", node) 689 690 return None 691 692 visitBackquote = OP 693 694 visitBitand = _visitBinary 695 696 visitBitor = _visitBinary 697 698 visitBitxor = _visitBinary 699 700 def visitBreak(self, node): 701 self.NOP(node) 702 self.suspend_broken_branch() 703 704 visitCallFunc = OP 705 706 def visitClass(self, node): 707 708 """ 709 Register the class at the given 'node' subject to the restrictions 710 mentioned in the module docstring. 711 """ 712 713 if self.namespaces: 714 print "Warning: class %r in %r is not global: ignored." % (node.name, self.namespaces[-1].full_name()) 715 return None 716 else: 717 if self.in_loop: 718 print "Warning: class %r in %r defined in a loop." % (node.name, self.full_name()) 719 720 cls = get_class(node.name, self.get_namespace(), self, node) 721 722 # Make a back reference from the node for code generation. 723 724 node.unit = cls 725 726 # Process base classes in the context of the class's namespace. 727 # This confines references to such classes to the class instead of 728 # the namespace in which it is defined. 729 730 self.namespaces.append(cls) 731 732 # Visit the base class expressions, attempting to find concrete 733 # definitions of classes. 734 735 for base in node.bases: 736 expr = self.dispatch(base) 737 738 # Each base class must be constant and known at compile-time. 739 740 if isinstance(expr, Attr): 741 if expr.assignments != 1: 742 raise InspectError("Base class %r for %r is not constant." % (base, cls.full_name())) 743 else: 744 cls.add_base(expr.get_value()) 745 746 # Where no expression value is available, the base class is 747 # not identifiable. 748 749 else: 750 raise InspectError("Base class %r for %r is not found: it may be hidden in some way." % (base, cls.full_name())) 751 752 # NOTE: Potentially dubious measure to permit __init__ availability. 753 # If no bases exist, adopt the 'object' class. 754 755 if not node.bases and not (self.name == "__builtins__" and node.name == "object") : 756 expr = self.dispatch(compiler.ast.Name("object")) 757 cls.add_base(expr.get_value()) 758 759 # Make an entry for the class in the parent namespace. 760 761 self.namespaces.pop() 762 self.store(node.name, cls) 763 self.add_object(cls) 764 765 # Process the class body in its own namespace. 766 767 self.namespaces.append(cls) 768 self.dispatch(node.code) 769 self.namespaces.pop() 770 771 cls.finalise_attribute_usage() 772 return cls 773 774 def visitCompare(self, node): 775 776 # Accounting. 777 # NOTE: Replicates some code in micropython.ast.visitCompare. 778 779 this_node = node 780 781 for op in node.ops: 782 op_name, next_node = op 783 784 # Define name/attribute usage. 785 # Get the applicable operation. 786 787 operator_fn = operator_functions.get(op_name) 788 789 # For operators, reference the specific function involved. 790 791 if operator_fn is not None: 792 operator_module = self._ensureOperators() 793 self.use_specific_attribute(operator_module.full_name(), operator_fn) 794 795 # Define __contains__ usage on the next node. 796 797 elif op_name.endswith("in"): 798 self.use_name("__contains__", next_node) 799 800 this_node = next_node 801 802 return self.OP(node) 803 804 def visitConst(self, node): 805 806 # Register the constant, if necessary, returning the resulting object. 807 # The type name is noted as being used, thus preserving the class in any 808 # generated program. 809 810 self.use_specific_attribute("__builtins__", self.importer.get_constant_type_name(node.value)) 811 return self.importer.make_constant(node.value) 812 813 def visitContinue(self, node): 814 self.NOP(node) 815 self.suspend_continuing_branch() 816 817 visitDecorators = NOP 818 819 visitDict = OP 820 821 visitDiscard = NOP 822 823 visitDiv = _visitBinary 824 825 visitEllipsis = NOP 826 827 visitExec = NOP 828 829 visitExpression = OP 830 831 visitFloorDiv = _visitBinary 832 833 def visitFor(self, node): 834 self.new_branchpoint(node) 835 836 # Declare names which will be used by generated code. 837 838 self.use_name("__iter__", node.list) 839 self.use_name("next") 840 self.use_name("StopIteration") 841 842 in_loop = self.in_loop 843 self.in_loop = 1 844 self.dispatch(node.list) 845 self.dispatch(node.assign) 846 847 # Enter the loop. 848 # Propagate attribute usage to branches. 849 850 self.new_branch(node) 851 self.dispatch(node.body) 852 853 self.resume_continuing_branches() 854 855 self.shelve_branch() 856 857 self.in_loop = in_loop 858 859 # A null branch is used to record a path around the loop. 860 861 self.new_branch(node.else_ or NullBranch()) 862 self.shelve_branch() 863 864 self.merge_branches() 865 866 # The else clause is evaluated outside any branch. 867 868 if node.else_ is not None: 869 self.dispatch(node.else_) 870 871 # Any suspended branches from the loop can now be resumed. 872 873 self.resume_broken_branches() 874 875 return None 876 877 def visitFrom(self, node): 878 module = self.importer.load(node.modname, 1) 879 880 #if module is None: 881 # print "Warning:", node.modname, "not imported." 882 883 for name, alias in node.names: 884 if name != "*": 885 if module is not None and module.has_key(name): 886 attr = module[name] 887 self.store(alias or name, attr) 888 self.use_specific_attribute(module.full_name(), name) 889 if isinstance(attr.get_value(), Module) and not attr.get_value().loaded: 890 self.importer.load(attr.get_value().name) 891 892 # Support the import of names from missing modules. 893 894 else: 895 self.store(alias or name, UnresolvedName(name, node.modname, self)) 896 else: 897 if module is not None: 898 for n in module.keys(): 899 attr = module[n] 900 self.store(n, attr) 901 self.use_specific_attribute(module.full_name(), n) 902 if isinstance(attr.get_value(), Module) and not attr.get_value().loaded: 903 self.importer.load(attr.get_value().name) 904 905 return None 906 907 def visitFunction(self, node): 908 return self._visitFunction(node, node.name) 909 910 visitGenExpr = OP 911 912 visitGenExprFor = NOP 913 914 visitGenExprIf = NOP 915 916 visitGenExprInner = NOP 917 918 def visitGetattr(self, node): 919 expr = self.dispatch(node.expr) 920 attrname = node.attrname 921 return self._visitAttr(expr, attrname, node) 922 923 def visitGlobal(self, node): 924 if self.namespaces: 925 for name in node.names: 926 ns = self.namespaces[-1] 927 if not ns.make_global(name): 928 raise InspectError("Name %r is global and local in %r" % (name, ns.full_name())) 929 930 # The name is recorded in an earlier process. 931 932 def visitIf(self, node): 933 self.new_branchpoint() 934 935 # Propagate attribute usage to branches. 936 937 for test, body in node.tests: 938 self.dispatch(test) 939 940 self.new_branch(body) 941 self.dispatch(body) 942 self.shelve_branch() 943 944 # Maintain a branch for the else clause. 945 946 self.new_branch(node.else_ or NullBranch()) 947 if node.else_ is not None: 948 self.dispatch(node.else_) 949 self.shelve_branch() 950 951 self.merge_branches() 952 return None 953 954 visitIfExp = NOP 955 956 def visitImport(self, node): 957 for name, alias in node.names: 958 if alias is not None: 959 module = self.importer.load(name, 1) or UnresolvedName(None, name, self) 960 self.store(alias, module) 961 else: 962 module = self.importer.load(name) or UnresolvedName(None, name.split(".")[0], self) 963 self.store(name.split(".")[0], module) 964 965 return None 966 967 visitInvert = _visitUnary 968 969 def visitKeyword(self, node): 970 self.dispatch(node.expr) 971 self.importer.make_constant(node.name) 972 self.keyword_names.add(node.name) 973 return None 974 975 def visitLambda(self, node): 976 fn = self._visitFunction(node, None) 977 self.use_specific_attribute(None, fn.name) 978 return fn 979 980 visitLeftShift = _visitBinary 981 982 def visitList(self, node): 983 self.use_specific_attribute("__builtins__", "list") 984 self.OP(node) 985 986 def visitListComp(self, node): 987 for qual in node.quals: 988 self.dispatch(qual) 989 self.dispatch(node.expr) 990 991 def visitListCompFor(self, node): 992 self.new_branchpoint() 993 994 # Declare names which will be used by generated code. 995 996 self.use_name("__iter__", node.list) 997 self.use_name("next") 998 999 in_loop = self.in_loop 1000 self.in_loop = 1 1001 self.dispatch(node.list) 1002 self.dispatch(node.assign) 1003 1004 # Enter the loop. 1005 # Propagate attribute usage to branches. 1006 1007 self.new_branch(node) 1008 1009 for if_ in node.ifs: 1010 self.dispatch(if_) 1011 1012 self.shelve_branch() 1013 self.in_loop = in_loop 1014 1015 self.merge_branches() 1016 return None 1017 1018 visitListCompIf = NOP 1019 1020 visitMod = _visitBinary 1021 1022 def visitModule(self, node): 1023 1024 # Make a back reference from the node for code generation. 1025 1026 node.unit = self 1027 return self.dispatch(node.node) 1028 1029 visitMul = _visitBinary 1030 1031 def visitName(self, node): 1032 return self.get_namespace().get_using_node(node.name, node) 1033 1034 visitNot = OP 1035 1036 visitOr = OP 1037 1038 visitPass = NOP 1039 1040 visitPower = _visitBinary 1041 1042 def _visitPrint(self, node, function_name): 1043 self.NOP(node) 1044 self.use_specific_attribute("__builtins__", function_name) 1045 1046 def visitPrint(self, node): 1047 self._visitPrint(node, "_print") 1048 1049 def visitPrintnl(self, node): 1050 self._visitPrint(node, "_printnl") 1051 1052 visitRaise = NOP_ABANDON 1053 1054 visitReturn = NOP_ABANDON 1055 1056 visitRightShift = _visitBinary 1057 1058 def visitSlice(self, node): 1059 self._visitOperator(node, self.in_assignment and "AssSlice" or "Slice") 1060 1061 visitSliceobj = OP 1062 1063 def visitStmt(self, node): 1064 for n in node.nodes: 1065 self.dispatch(n) 1066 return None 1067 1068 visitSub = _visitBinary 1069 1070 def visitSubscript(self, node): 1071 self._visitOperator(node, self.in_assignment and "AssSubscript" or "Subscript") 1072 1073 def visitTryExcept(self, node): 1074 self.dispatch(node.body) 1075 1076 self.new_branchpoint() 1077 1078 for name, var, n in node.handlers: 1079 self.new_branch(node) 1080 1081 # Establish the local for the handler. 1082 1083 if var is not None: 1084 self.dispatch(var) 1085 if n is not None: 1086 self.dispatch(n) 1087 1088 self.shelve_branch() 1089 1090 self.new_branch(node.else_ or NullBranch()) 1091 if node.else_ is not None: 1092 self.dispatch(node.else_) 1093 self.shelve_branch() 1094 1095 self.merge_branches() 1096 return None 1097 1098 visitTryFinally = NOP 1099 1100 visitTuple = OP 1101 1102 visitUnaryAdd = _visitUnary 1103 1104 visitUnarySub = _visitUnary 1105 1106 def visitWhile(self, node): 1107 self.new_branchpoint(node) 1108 1109 # Propagate attribute usage to branches. 1110 1111 in_loop = self.in_loop 1112 self.in_loop = 1 1113 1114 # The test is evaluated initially and again in the loop. 1115 1116 self.dispatch(node.test) 1117 1118 self.new_branch(node) 1119 self.dispatch(node.body) 1120 1121 self.resume_continuing_branches() 1122 1123 self.dispatch(node.test) 1124 self.shelve_branch() 1125 1126 self.in_loop = in_loop 1127 1128 # A null branch is used to record a path around the loop. 1129 1130 self.new_branch(node.else_ or NullBranch()) 1131 self.shelve_branch() 1132 1133 self.merge_branches() 1134 1135 # The else clause is evaluated outside any branch. 1136 1137 if node.else_ is not None: 1138 self.dispatch(node.else_) 1139 1140 # Any suspended branches from the loop can now be resumed. 1141 1142 self.resume_broken_branches() 1143 1144 return None 1145 1146 visitWith = NOP 1147 1148 visitYield = NOP 1149 1150 # vim: tabstop=4 expandtab shiftwidth=4