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. 657 658 self.use_specific_attribute(None, node.name) 659 return None 660 661 visitAssTuple = visitAssList 662 663 def visitAugAssign(self, node): 664 665 # Accounting. 666 667 operator_fn = operator_functions.get(node.op) 668 operator_module = self._ensureOperators() 669 self.use_specific_attribute(operator_module.full_name(), operator_fn) 670 671 # Process the assignment. 672 673 self.expr = self.dispatch(node.expr) 674 675 # NOTE: Similar to micropython.ast handler code. 676 # NOTE: Slices and subscripts are supported by __setitem__(slice) and 677 # NOTE: not __setslice__. 678 679 if isinstance(node.node, compiler.ast.Name): 680 self.visitAssName(node.node) 681 elif isinstance(node.node, compiler.ast.Getattr): 682 self.visitAssAttr(node.node) 683 else: 684 self.use_specific_attribute("__builtins__", "slice") 685 self.use_name("__setitem__", node) 686 687 return None 688 689 visitBackquote = OP 690 691 visitBitand = _visitBinary 692 693 visitBitor = _visitBinary 694 695 visitBitxor = _visitBinary 696 697 def visitBreak(self, node): 698 self.NOP(node) 699 self.suspend_broken_branch() 700 701 visitCallFunc = OP 702 703 def visitClass(self, node): 704 705 """ 706 Register the class at the given 'node' subject to the restrictions 707 mentioned in the module docstring. 708 """ 709 710 if self.namespaces: 711 print "Warning: class %r in %r is not global: ignored." % (node.name, self.namespaces[-1].full_name()) 712 return None 713 else: 714 if self.in_loop: 715 print "Warning: class %r in %r defined in a loop." % (node.name, self.full_name()) 716 717 cls = get_class(node.name, self.get_namespace(), self, node) 718 719 # Make a back reference from the node for code generation. 720 721 node.unit = cls 722 723 # Process base classes in the context of the class's namespace. 724 # This confines references to such classes to the class instead of 725 # the namespace in which it is defined. 726 727 self.namespaces.append(cls) 728 729 # Visit the base class expressions, attempting to find concrete 730 # definitions of classes. 731 732 for base in node.bases: 733 expr = self.dispatch(base) 734 735 # Each base class must be constant and known at compile-time. 736 737 if isinstance(expr, Attr): 738 if expr.assignments != 1: 739 raise InspectError("Base class %r for %r is not constant." % (base, cls.full_name())) 740 else: 741 cls.add_base(expr.get_value()) 742 743 # Where no expression value is available, the base class is 744 # not identifiable. 745 746 else: 747 raise InspectError("Base class %r for %r is not found: it may be hidden in some way." % (base, cls.full_name())) 748 749 # NOTE: Potentially dubious measure to permit __init__ availability. 750 # If no bases exist, adopt the 'object' class. 751 752 if not node.bases and not (self.name == "__builtins__" and node.name == "object") : 753 expr = self.dispatch(compiler.ast.Name("object")) 754 cls.add_base(expr.get_value()) 755 756 # Make an entry for the class in the parent namespace. 757 758 self.namespaces.pop() 759 self.store(node.name, cls) 760 self.add_object(cls) 761 762 # Process the class body in its own namespace. 763 764 self.namespaces.append(cls) 765 self.dispatch(node.code) 766 self.namespaces.pop() 767 768 cls.finalise_attribute_usage() 769 return cls 770 771 def visitCompare(self, node): 772 773 # Accounting. 774 # NOTE: Replicates some code in micropython.ast.visitCompare. 775 776 this_node = node 777 778 for op in node.ops: 779 op_name, next_node = op 780 781 # Define name/attribute usage. 782 # Get the applicable operation. 783 784 operator_fn = operator_functions.get(op_name) 785 786 # For operators, reference the specific function involved. 787 788 if operator_fn is not None: 789 operator_module = self._ensureOperators() 790 self.use_specific_attribute(operator_module.full_name(), operator_fn) 791 792 # Define __contains__ usage on the next node. 793 794 elif op_name.endswith("in"): 795 self.use_name("__contains__", next_node) 796 797 this_node = next_node 798 799 return self.OP(node) 800 801 def visitConst(self, node): 802 803 # Register the constant, if necessary, returning the resulting object. 804 # The type name is noted as being used, thus preserving the class in any 805 # generated program. 806 807 self.use_name(self.importer.get_constant_type_name(node.value), node) 808 return self.importer.make_constant(node.value) 809 810 def visitContinue(self, node): 811 self.NOP(node) 812 self.suspend_continuing_branch() 813 814 visitDecorators = NOP 815 816 visitDict = OP 817 818 visitDiscard = NOP 819 820 visitDiv = _visitBinary 821 822 visitEllipsis = NOP 823 824 visitExec = NOP 825 826 visitExpression = OP 827 828 visitFloorDiv = _visitBinary 829 830 def visitFor(self, node): 831 self.new_branchpoint(node) 832 833 # Declare names which will be used by generated code. 834 835 self.use_name("__iter__", node.list) 836 self.use_name("next") 837 self.use_name("StopIteration") 838 839 in_loop = self.in_loop 840 self.in_loop = 1 841 self.dispatch(node.list) 842 self.dispatch(node.assign) 843 844 # Enter the loop. 845 # Propagate attribute usage to branches. 846 847 self.new_branch(node) 848 self.dispatch(node.body) 849 850 self.resume_continuing_branches() 851 852 self.shelve_branch() 853 854 self.in_loop = in_loop 855 856 # A null branch is used to record a path around the loop. 857 858 self.new_branch(node.else_ or NullBranch()) 859 self.shelve_branch() 860 861 self.merge_branches() 862 863 # The else clause is evaluated outside any branch. 864 865 if node.else_ is not None: 866 self.dispatch(node.else_) 867 868 # Any suspended branches from the loop can now be resumed. 869 870 self.resume_broken_branches() 871 872 return None 873 874 def visitFrom(self, node): 875 module = self.importer.load(node.modname, 1) 876 877 #if module is None: 878 # print "Warning:", node.modname, "not imported." 879 880 for name, alias in node.names: 881 if name != "*": 882 if module is not None and module.has_key(name): 883 attr = module[name] 884 self.store(alias or name, attr) 885 self.use_specific_attribute(module.full_name(), name) 886 if isinstance(attr.get_value(), Module) and not attr.get_value().loaded: 887 self.importer.load(attr.get_value().name) 888 889 # Support the import of names from missing modules. 890 891 else: 892 self.store(alias or name, UnresolvedName(name, node.modname, self)) 893 else: 894 if module is not None: 895 for n in module.keys(): 896 attr = module[n] 897 self.store(n, attr) 898 self.use_specific_attribute(module.full_name(), n) 899 if isinstance(attr.get_value(), Module) and not attr.get_value().loaded: 900 self.importer.load(attr.get_value().name) 901 902 return None 903 904 def visitFunction(self, node): 905 return self._visitFunction(node, node.name) 906 907 visitGenExpr = OP 908 909 visitGenExprFor = NOP 910 911 visitGenExprIf = NOP 912 913 visitGenExprInner = NOP 914 915 def visitGetattr(self, node): 916 expr = self.dispatch(node.expr) 917 attrname = node.attrname 918 return self._visitAttr(expr, attrname, node) 919 920 def visitGlobal(self, node): 921 if self.namespaces: 922 for name in node.names: 923 ns = self.namespaces[-1] 924 if not ns.make_global(name): 925 raise InspectError("Name %r is global and local in %r" % (name, ns.full_name())) 926 927 # The name is recorded in an earlier process. 928 929 def visitIf(self, node): 930 self.new_branchpoint() 931 932 # Propagate attribute usage to branches. 933 934 for test, body in node.tests: 935 self.dispatch(test) 936 937 self.new_branch(body) 938 self.dispatch(body) 939 self.shelve_branch() 940 941 # Maintain a branch for the else clause. 942 943 self.new_branch(node.else_ or NullBranch()) 944 if node.else_ is not None: 945 self.dispatch(node.else_) 946 self.shelve_branch() 947 948 self.merge_branches() 949 return None 950 951 visitIfExp = NOP 952 953 def visitImport(self, node): 954 for name, alias in node.names: 955 if alias is not None: 956 module = self.importer.load(name, 1) or UnresolvedName(None, name, self) 957 self.store(alias, module) 958 else: 959 module = self.importer.load(name) or UnresolvedName(None, name.split(".")[0], self) 960 self.store(name.split(".")[0], module) 961 962 return None 963 964 visitInvert = _visitUnary 965 966 def visitKeyword(self, node): 967 self.dispatch(node.expr) 968 self.importer.make_constant(node.name) 969 self.keyword_names.add(node.name) 970 return None 971 972 def visitLambda(self, node): 973 fn = self._visitFunction(node, None) 974 self.use_specific_attribute(None, fn.name) 975 return fn 976 977 visitLeftShift = _visitBinary 978 979 def visitList(self, node): 980 self.use_specific_attribute("__builtins__", "list") 981 self.OP(node) 982 983 def visitListComp(self, node): 984 for qual in node.quals: 985 self.dispatch(qual) 986 self.dispatch(node.expr) 987 988 def visitListCompFor(self, node): 989 self.new_branchpoint() 990 991 # Declare names which will be used by generated code. 992 993 self.use_name("__iter__", node.list) 994 self.use_name("next") 995 996 in_loop = self.in_loop 997 self.in_loop = 1 998 self.dispatch(node.list) 999 self.dispatch(node.assign) 1000 1001 # Enter the loop. 1002 # Propagate attribute usage to branches. 1003 1004 self.new_branch(node) 1005 1006 for if_ in node.ifs: 1007 self.dispatch(if_) 1008 1009 self.shelve_branch() 1010 self.in_loop = in_loop 1011 1012 self.merge_branches() 1013 return None 1014 1015 visitListCompIf = NOP 1016 1017 visitMod = _visitBinary 1018 1019 def visitModule(self, node): 1020 1021 # Make a back reference from the node for code generation. 1022 1023 node.unit = self 1024 return self.dispatch(node.node) 1025 1026 visitMul = _visitBinary 1027 1028 def visitName(self, node): 1029 return self.get_namespace().get_using_node(node.name, node) 1030 1031 visitNot = OP 1032 1033 visitOr = OP 1034 1035 visitPass = NOP 1036 1037 visitPower = _visitBinary 1038 1039 def _visitPrint(self, node, function_name): 1040 self.NOP(node) 1041 self.use_specific_attribute("__builtins__", function_name) 1042 1043 def visitPrint(self, node): 1044 self._visitPrint(node, "_print") 1045 1046 def visitPrintnl(self, node): 1047 self._visitPrint(node, "_printnl") 1048 1049 visitRaise = NOP_ABANDON 1050 1051 visitReturn = NOP_ABANDON 1052 1053 visitRightShift = _visitBinary 1054 1055 def visitSlice(self, node): 1056 self._visitOperator(node, self.in_assignment and "AssSlice" or "Slice") 1057 1058 visitSliceobj = OP 1059 1060 def visitStmt(self, node): 1061 for n in node.nodes: 1062 self.dispatch(n) 1063 return None 1064 1065 visitSub = _visitBinary 1066 1067 def visitSubscript(self, node): 1068 self._visitOperator(node, self.in_assignment and "AssSubscript" or "Subscript") 1069 1070 def visitTryExcept(self, node): 1071 self.dispatch(node.body) 1072 1073 self.new_branchpoint() 1074 1075 for name, var, n in node.handlers: 1076 self.new_branch(node) 1077 1078 # Establish the local for the handler. 1079 1080 if var is not None: 1081 self.dispatch(var) 1082 if n is not None: 1083 self.dispatch(n) 1084 1085 self.shelve_branch() 1086 1087 self.new_branch(node.else_ or NullBranch()) 1088 if node.else_ is not None: 1089 self.dispatch(node.else_) 1090 self.shelve_branch() 1091 1092 self.merge_branches() 1093 return None 1094 1095 visitTryFinally = NOP 1096 1097 visitTuple = OP 1098 1099 visitUnaryAdd = _visitUnary 1100 1101 visitUnarySub = _visitUnary 1102 1103 def visitWhile(self, node): 1104 self.new_branchpoint(node) 1105 1106 # Propagate attribute usage to branches. 1107 1108 in_loop = self.in_loop 1109 self.in_loop = 1 1110 1111 # The test is evaluated initially and again in the loop. 1112 1113 self.dispatch(node.test) 1114 1115 self.new_branch(node) 1116 self.dispatch(node.body) 1117 1118 self.resume_continuing_branches() 1119 1120 self.dispatch(node.test) 1121 self.shelve_branch() 1122 1123 self.in_loop = in_loop 1124 1125 # A null branch is used to record a path around the loop. 1126 1127 self.new_branch(node.else_ or NullBranch()) 1128 self.shelve_branch() 1129 1130 self.merge_branches() 1131 1132 # The else clause is evaluated outside any branch. 1133 1134 if node.else_ is not None: 1135 self.dispatch(node.else_) 1136 1137 # Any suspended branches from the loop can now be resumed. 1138 1139 self.resume_broken_branches() 1140 1141 return None 1142 1143 visitWith = NOP 1144 1145 visitYield = NOP 1146 1147 # vim: tabstop=4 expandtab shiftwidth=4