1 #!/usr/bin/env python 2 3 """ 4 Translate programs. 5 6 Copyright (C) 2015-2018, 2023, 2024 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 from common import AccessLocation, CommonModule, CommonOutput, Location, \ 23 first, get_builtin_class, init_item, is_newer, \ 24 predefined_constants 25 from encoders import encode_access_instruction, encode_access_instruction_arg, \ 26 encode_function_pointer, encode_literal_instantiator, \ 27 encode_instantiator_pointer, encode_path, encode_symbol, \ 28 encode_type_attribute, is_type_attribute, \ 29 type_ops, typename_ops 30 from errors import InspectError, TranslateError 31 from os.path import exists, join 32 from os import makedirs 33 from referencing import Reference, combine_types 34 from results import Result 35 from transresults import TrConstantValueRef, TrInstanceRef, \ 36 TrLiteralSequenceRef, TrResolvedNameRef, \ 37 AliasResult, AttrResult, Expression, InstantiationResult, \ 38 InvocationResult, LogicalOperationResult, \ 39 LogicalResult, NegationResult, PredefinedConstantRef, \ 40 ReturnRef 41 from StringIO import StringIO 42 import compiler 43 import sys 44 45 class Translator(CommonOutput): 46 47 "A program translator." 48 49 def __init__(self, importer, deducer, optimiser, output): 50 self.importer = importer 51 self.deducer = deducer 52 self.optimiser = optimiser 53 self.output = output 54 55 def to_output(self, reset=False, debug=False, gc_sections=False): 56 57 "Write a program to the configured output directory." 58 59 # Make a directory for the final sources. 60 61 output = join(self.output, "src") 62 63 if not exists(output): 64 makedirs(output) 65 66 # Clean the output directory of irrelevant data. 67 68 self.check_output("debug=%r gc_sections=%r" % (debug, gc_sections)) 69 70 for module in self.importer.modules.values(): 71 output_filename = join(output, "%s.c" % module.name) 72 73 # Do not generate modules in the native package. They are provided 74 # by native functionality source files. 75 76 parts = module.name.split(".") 77 78 if parts[0] != "native" and \ 79 (reset or is_newer(module.filename, output_filename)): 80 81 tm = TranslatedModule(module.name, self.importer, self.deducer, self.optimiser) 82 tm.translate(module.filename, output_filename) 83 84 85 86 def make_expression(expr): 87 88 "Make a new expression from the existing 'expr'." 89 90 if isinstance(expr, Result): 91 return expr 92 else: 93 return Expression(str(expr)) 94 95 96 97 # The actual translation process itself. 98 99 class TranslatedModule(CommonModule): 100 101 "A module translator." 102 103 def __init__(self, name, importer, deducer, optimiser): 104 CommonModule.__init__(self, name, importer) 105 self.deducer = deducer 106 self.optimiser = optimiser 107 108 # Output stream. 109 110 self.out_toplevel = self.out = None 111 self.indent = 0 112 self.tabstop = " " 113 114 # Recorded namespaces. 115 116 self.namespaces = [] 117 self.in_conditional = False 118 self.in_parameter_list = False 119 120 # Exception raising adjustments. 121 122 self.in_try_finally = False 123 self.in_try_except = False 124 125 # Attribute access and accessor counting. 126 127 self.attr_accesses = {} 128 self.attr_accessors = {} 129 130 # Special variable usage. 131 132 self.temp_usage = {} 133 134 # Initialise some data used for attribute access generation. 135 136 self.init_substitutions() 137 138 def __repr__(self): 139 return "TranslatedModule(%r, %r)" % (self.name, self.importer) 140 141 def translate(self, filename, output_filename): 142 143 """ 144 Parse the file having the given 'filename', writing the translation to 145 the given 'output_filename'. 146 """ 147 148 self.parse_file(filename) 149 150 # Collect function namespaces for separate processing. 151 152 self.record_namespaces(self.astnode) 153 154 # Reset the lambda naming (in order to obtain the same names again) and 155 # translate the program. 156 157 self.reset_lambdas() 158 159 self.out_toplevel = self.out = open(output_filename, "w") 160 try: 161 self.start_output() 162 163 # Process namespaces, writing the translation. 164 165 for path, node in self.namespaces: 166 self.process_namespace(path, node) 167 168 # Process the module namespace including class namespaces. 169 170 self.process_namespace([], self.astnode) 171 172 finally: 173 self.out.close() 174 175 def have_object(self): 176 177 "Return whether a namespace is a recorded object." 178 179 return self.importer.objects.get(self.get_namespace_path()) 180 181 def get_builtin_class(self, name): 182 183 "Return a reference to the actual object providing 'name'." 184 185 return self.importer.get_object(get_builtin_class(name)) 186 187 def is_method(self, path): 188 189 "Return whether 'path' is a method." 190 191 class_name, method_name = path.rsplit(".", 1) 192 return self.importer.classes.has_key(class_name) and class_name or None 193 194 def in_method(self): 195 196 "Return whether the current namespace provides a method." 197 198 return self.in_function and self.is_method(self.get_namespace_path()) 199 200 # Namespace recording. 201 202 def record_namespaces(self, node): 203 204 "Process the program structure 'node', recording namespaces." 205 206 for n in node.getChildNodes(): 207 self.record_namespaces_in_node(n) 208 209 def record_namespaces_in_node(self, node): 210 211 "Process the program structure 'node', recording namespaces." 212 213 # Function namespaces within modules, classes and other functions. 214 # Functions appearing within conditional statements are given arbitrary 215 # names. 216 217 if isinstance(node, compiler.ast.Function): 218 self.record_function_node(node, (self.in_conditional or self.in_function) and self.get_lambda_name() or node.name) 219 220 elif isinstance(node, compiler.ast.Lambda): 221 self.record_function_node(node, self.get_lambda_name()) 222 223 # Classes are visited, but may be ignored if inside functions. 224 225 elif isinstance(node, compiler.ast.Class): 226 self.enter_namespace(node.name) 227 if self.have_object(): 228 self.record_namespaces(node) 229 self.exit_namespace() 230 231 # Conditional nodes are tracked so that function definitions may be 232 # handled. Since "for" loops are converted to "while" loops, they are 233 # included here. 234 235 elif isinstance(node, (compiler.ast.For, compiler.ast.If, compiler.ast.While)): 236 in_conditional = self.in_conditional 237 self.in_conditional = True 238 self.record_namespaces(node) 239 self.in_conditional = in_conditional 240 241 # All other nodes are processed depth-first. 242 243 else: 244 self.record_namespaces(node) 245 246 def record_function_node(self, n, name): 247 248 """ 249 Record the given function, lambda, if expression or list comprehension 250 node 'n' with the given 'name'. 251 """ 252 253 self.in_function = True 254 self.enter_namespace(name) 255 256 if self.have_object(): 257 258 # Record the namespace path and the node itself. 259 260 self.namespaces.append((self.namespace_path[:], n)) 261 self.record_namespaces_in_node(n.code) 262 263 self.exit_namespace() 264 self.in_function = False 265 266 # Constant referencing. 267 268 def get_literal_instance(self, n, name=None): 269 270 """ 271 For node 'n', return a reference for the type of the given 'name', or if 272 'name' is not specified, deduce the type from the value. 273 """ 274 275 # Handle stray None constants (Sliceobj seems to produce them). 276 277 if name is None and n.value is None: 278 return self.process_name_node(compiler.ast.Name("None")) 279 280 if name in ("dict", "list", "tuple"): 281 ref = self.get_builtin_class(name) 282 return self.process_literal_sequence_node(n, name, ref, TrLiteralSequenceRef) 283 else: 284 value, typename, encoding = self.get_constant_value(n.value, n.literals) 285 ref = self.get_builtin_class(typename) 286 value_type = ref.get_origin() 287 288 path = self.get_namespace_path() 289 290 # Obtain the local numbering of the constant and thus the 291 # locally-qualified name. 292 293 local_number = self.importer.all_constants[path][(value, value_type, encoding)] 294 constant_name = "$c%d" % local_number 295 objpath = self.get_object_path(constant_name) 296 297 # Obtain the unique identifier for the constant. 298 299 number = self.optimiser.constant_numbers[objpath] 300 return TrConstantValueRef(constant_name, ref.instance_of(), value, number) 301 302 # Namespace translation. 303 304 def process_namespace(self, path, node): 305 306 """ 307 Process the namespace for the given 'path' defined by the given 'node'. 308 """ 309 310 self.namespace_path = path 311 312 if isinstance(node, (compiler.ast.Function, compiler.ast.Lambda)): 313 self.in_function = True 314 self.process_function_body_node(node) 315 else: 316 self.in_function = False 317 self.reset_temp_limits() 318 319 self.start_module() 320 self.process_structure(node) 321 self.end_module() 322 323 def process_structure(self, node): 324 325 "Process the given 'node' or result." 326 327 # Handle processing requests on results. 328 329 if isinstance(node, Result): 330 return node 331 332 # Handle processing requests on nodes. 333 334 else: 335 l = CommonModule.process_structure(self, node) 336 337 # Return indications of return statement usage. 338 339 if l and isinstance(l[-1], ReturnRef): 340 return l[-1] 341 else: 342 return None 343 344 def process_statement_node(self, node, is_lambda=False): 345 346 "Process the given statement 'node'." 347 348 self.reset_temp_counters() 349 350 if is_lambda: 351 self.result_target_name = "__result" 352 353 return CommonModule.process_statement_node(self, node) 354 355 def process_structure_node(self, n): 356 357 "Process the individual node 'n'." 358 359 # Plain statements emit their expressions. 360 361 if isinstance(n, compiler.ast.Discard): 362 expr = self.process_structure_node(n.expr) 363 self.statement(expr) 364 365 # Module import declarations. 366 367 elif isinstance(n, compiler.ast.From): 368 self.process_from_node(n) 369 370 # Nodes using operator module functions. 371 372 elif isinstance(n, compiler.ast.Operator): 373 return self.process_operator_node(n) 374 375 elif isinstance(n, compiler.ast.AugAssign): 376 self.process_augassign_node(n) 377 378 elif isinstance(n, compiler.ast.Compare): 379 return self.process_compare_node(n) 380 381 elif isinstance(n, compiler.ast.Slice): 382 return self.process_slice_node(n) 383 384 elif isinstance(n, compiler.ast.Sliceobj): 385 return self.process_sliceobj_node(n) 386 387 elif isinstance(n, compiler.ast.Subscript): 388 return self.process_subscript_node(n) 389 390 # Classes are visited, but may be ignored if inside functions. 391 392 elif isinstance(n, compiler.ast.Class): 393 self.process_class_node(n) 394 395 # Functions within namespaces have any dynamic defaults initialised. 396 397 elif isinstance(n, compiler.ast.Function): 398 self.process_function_node(n) 399 400 # Lambdas are replaced with references to separately-generated 401 # functions. 402 403 elif isinstance(n, compiler.ast.Lambda): 404 return self.process_lambda_node(n) 405 406 # Assignments. 407 408 elif isinstance(n, compiler.ast.Assign): 409 410 # Handle each assignment node. 411 412 for node in n.nodes: 413 self.process_assignment_node(node, n.expr) 414 415 # Accesses. 416 417 elif isinstance(n, compiler.ast.Getattr): 418 return self.process_attribute_access(n) 419 420 # Names. 421 422 elif isinstance(n, compiler.ast.Name): 423 return self.process_name_node(n) 424 425 # Loops and conditionals. 426 427 elif isinstance(n, compiler.ast.For): 428 self.process_for_node(n) 429 430 elif isinstance(n, compiler.ast.While): 431 self.process_while_node(n) 432 433 elif isinstance(n, compiler.ast.If): 434 self.process_if_node(n) 435 436 elif isinstance(n, (compiler.ast.And, compiler.ast.Or)): 437 return self.process_logical_node(n) 438 439 elif isinstance(n, compiler.ast.Not): 440 return self.process_not_node(n) 441 442 # Exception control-flow tracking. 443 444 elif isinstance(n, compiler.ast.TryExcept): 445 self.process_try_node(n) 446 447 elif isinstance(n, compiler.ast.TryFinally): 448 self.process_try_finally_node(n) 449 450 # Control-flow modification statements. 451 452 elif isinstance(n, compiler.ast.Break): 453 self.writestmt("break;") 454 455 elif isinstance(n, compiler.ast.Continue): 456 self.writestmt("continue;") 457 458 elif isinstance(n, compiler.ast.Raise): 459 self.process_raise_node(n) 460 461 elif isinstance(n, compiler.ast.Return): 462 return self.process_return_node(n) 463 464 # Print statements. 465 466 elif isinstance(n, (compiler.ast.Print, compiler.ast.Printnl)): 467 self.statement(self.process_print_node(n)) 468 469 # Invocations. 470 471 elif isinstance(n, compiler.ast.CallFunc): 472 return self.process_invocation_node(n) 473 474 elif isinstance(n, compiler.ast.Keyword): 475 return self.process_structure_node(n.expr) 476 477 # Constant usage. 478 479 elif isinstance(n, compiler.ast.Const): 480 return self.get_literal_instance(n) 481 482 elif isinstance(n, compiler.ast.Dict): 483 return self.get_literal_instance(n, "dict") 484 485 elif isinstance(n, compiler.ast.List): 486 return self.get_literal_instance(n, "list") 487 488 elif isinstance(n, compiler.ast.Tuple): 489 return self.get_literal_instance(n, "tuple") 490 491 # All other nodes are processed depth-first. 492 493 else: 494 return self.process_structure(n) 495 496 def process_assignment_node(self, n, expr): 497 498 "Process the individual node 'n' to be assigned the contents of 'expr'." 499 500 # Names and attributes are assigned the entire expression. 501 502 if isinstance(n, compiler.ast.AssName): 503 name_ref = self.process_name_node(n, expr, True) 504 self.statement(name_ref) 505 506 # Employ guards after assignments if required. 507 508 if expr and name_ref.is_name(): 509 self.generate_guard(name_ref.name) 510 511 elif isinstance(n, compiler.ast.AssAttr): 512 in_assignment = self.in_assignment 513 self.result_target_name = "*__get_attr_ref(%d)" % self.attribute_ref_index 514 self.in_assignment = self.process_structure_node(expr) 515 self.statement(self.process_attribute_access(n)) 516 self.in_assignment = in_assignment 517 518 # Lists and tuples are matched against the expression and their 519 # items assigned to expression items. 520 521 elif isinstance(n, (compiler.ast.AssList, compiler.ast.AssTuple)): 522 self.process_assignment_node_items(n, expr) 523 524 # Slices and subscripts are permitted within assignment nodes. 525 526 elif isinstance(n, compiler.ast.Slice): 527 self.statement(self.process_slice_node(n, expr)) 528 529 elif isinstance(n, compiler.ast.Subscript): 530 self.statement(self.process_subscript_node(n, expr)) 531 532 def process_attribute_access(self, n): 533 534 "Process the given attribute access node 'n'." 535 536 # Obtain any completed chain and return the reference to it. 537 538 attr_expr = self.process_attribute_chain(n) 539 if self.have_access_expression(n): 540 return attr_expr 541 542 # Where the start of the chain of attributes has been reached, process 543 # the complete access. 544 545 name_ref = attr_expr and attr_expr.is_name() and attr_expr 546 name = name_ref and self.get_name_for_tracking(name_ref.name, name_ref) or None 547 548 location = self.get_access_location(name, self.attrs) 549 refs = self.get_referenced_attributes(location) 550 551 # Generate access instructions. 552 553 subs = { 554 "<expr>" : attr_expr, 555 "<name>" : attr_expr, 556 "<assexpr>" : self.in_assignment, 557 } 558 559 subs.update(self.temp_subs) 560 subs.update(self.op_subs) 561 562 output = [] 563 substituted = set() 564 565 # The context set or retrieved will be that used by any enclosing 566 # invocation. 567 568 accessor_index = self.accessor_index 569 attribute_ref_index = self.attribute_ref_index 570 context_index = self.context_index 571 context_identity = None 572 context_identity_verified = False 573 final_identity = None 574 accessor_test = False 575 accessor_stored = False 576 attribute_ref_stored = False 577 578 # Obtain encoded versions of each instruction, accumulating temporary 579 # variables. 580 581 for instruction in self.deducer.access_instructions[location]: 582 583 # Intercept a special instruction identifying the context. 584 585 if instruction[0] in ("<context_identity>", "<context_identity_verified>"): 586 context_identity, _substituted = \ 587 encode_access_instruction_arg(instruction[1], subs, instruction[0], 588 accessor_index, context_index, 589 attribute_ref_index) 590 context_identity_verified = instruction[0] == "<context_identity_verified>" 591 continue 592 593 # Intercept a special instruction identifying the target. The value 594 # is not encoded since it is used internally. 595 596 elif instruction[0] == "<final_identity>": 597 final_identity = instruction[1] 598 continue 599 600 # Modify test instructions. 601 602 elif instruction[0] in typename_ops or instruction[0] in type_ops: 603 instruction = ("__to_error", instruction) 604 accessor_test = True 605 606 # Intercept accessor storage. 607 608 elif instruction[0] == "<set_accessor>": 609 accessor_stored = True 610 611 # Intercept attribute reference storage. 612 613 elif instruction[0] == "<set_attr_ref>": 614 attribute_ref_stored = True 615 616 # Collect the encoded instruction, noting any temporary variables 617 # required by it. 618 619 encoded, _substituted = encode_access_instruction(instruction, subs, 620 accessor_index, context_index, 621 attribute_ref_index) 622 output.append(encoded) 623 substituted.update(_substituted) 624 625 # Record temporary name usage. 626 627 temps = set() 628 629 for sub in substituted: 630 if self.temp_subs.has_key(sub): 631 temps.add(self.temp_subs[sub]) 632 633 for temp in temps: 634 self.next_temp(temp) 635 636 # Get full final identity details. 637 638 if final_identity and not refs: 639 refs = set([self.importer.identify(final_identity)]) 640 641 del self.attrs[0] 642 return AttrResult(output, refs, location, 643 context_identity, context_identity_verified, 644 accessor_test, accessor_stored, attribute_ref_stored) 645 646 def init_substitutions(self): 647 648 """ 649 Initialise substitutions, defining temporary variable mappings, some of 650 which are also used as substitutions, together with operation mappings 651 used as substitutions in instructions defined by the optimiser. 652 """ 653 654 self.temp_subs = { 655 656 # Substitutions used by instructions. 657 658 "<private_context>" : "__tmp_private_context", 659 "<target_accessor>" : "__tmp_target_value", 660 661 # Mappings to be replaced by those given below. 662 663 "<accessor>" : "__tmp_values", 664 "<attr_ref>" : "__tmp_attr_refs", 665 "<context>" : "__tmp_contexts", 666 "<test_context_revert>" : "__tmp_contexts", 667 "<test_context_static>" : "__tmp_contexts", 668 "<set_context>" : "__tmp_contexts", 669 "<set_private_context>" : "__tmp_private_context", 670 "<set_accessor>" : "__tmp_values", 671 "<set_attr_ref>" : "__tmp_attr_refs", 672 "<set_target_accessor>" : "__tmp_target_value", 673 } 674 675 self.op_subs = { 676 "<accessor>" : "__get_accessor", 677 "<attr_ref>" : "__get_attr_ref", 678 "<context>" : "__get_context", 679 "<test_context_revert>" : "__test_context_revert", 680 "<test_context_static>" : "__test_context_static", 681 "<set_context>" : "__set_context", 682 "<set_private_context>" : "__set_private_context", 683 "<set_accessor>" : "__set_accessor", 684 "<set_attr_ref>" : "__set_attr_ref", 685 "<set_target_accessor>" : "__set_target_accessor", 686 } 687 688 def get_referenced_attributes(self, location): 689 690 """ 691 Convert 'location' to the form used by the deducer and retrieve any 692 identified attributes. 693 """ 694 695 # Determine whether any deduced references refer to the accessed 696 # attribute. 697 698 attrnames = location.attrnames 699 attrnames = attrnames and attrnames.split(".") 700 remaining = attrnames and len(attrnames) > 1 701 702 access_location = self.deducer.const_accesses.get(location) 703 704 if remaining and not access_location: 705 return set() 706 707 return self.deducer.get_references_for_access(access_location or location) 708 709 def get_referenced_attribute_invocations(self, location): 710 711 """ 712 Convert 'location' to the form used by the deducer and retrieve any 713 identified attribute invocation details. 714 """ 715 716 access_location = self.deducer.const_accesses.get(location) 717 return self.deducer.reference_invocations_unsuitable.get(access_location or location) 718 719 def get_accessor_kinds(self, location): 720 721 "Return the accessor kinds for 'location'." 722 723 return self.deducer.accessor_kinds.get(location) 724 725 def get_access_location(self, name, attrnames=None): 726 727 """ 728 Using the current namespace, the given 'name', and the 'attrnames' 729 employed in an access, return the access location. 730 """ 731 732 path = self.get_path_for_access() 733 734 # Get the location used by the deducer and optimiser and find any 735 # recorded access. 736 737 attrnames = attrnames and ".".join(self.attrs) 738 access_number = self.get_access_number(path, name, attrnames) 739 self.update_access_number(path, name, attrnames) 740 return AccessLocation(path, name, attrnames, access_number) 741 742 def get_access_number(self, path, name, attrnames): 743 access = name, attrnames 744 if self.attr_accesses.has_key(path) and self.attr_accesses[path].has_key(access): 745 return self.attr_accesses[path][access] 746 else: 747 return 0 748 749 def update_access_number(self, path, name, attrnames): 750 access = name, attrnames 751 if name: 752 init_item(self.attr_accesses, path, dict) 753 init_item(self.attr_accesses[path], access, lambda: 0) 754 self.attr_accesses[path][access] += 1 755 756 def get_accessor_location(self, name): 757 758 """ 759 Using the current namespace and the given 'name', return the accessor 760 location. 761 """ 762 763 path = self.get_path_for_access() 764 765 # Get the location used by the deducer and optimiser and find any 766 # recorded accessor. 767 768 version = self.get_accessor_number(path, name) 769 self.update_accessor_number(path, name) 770 return Location(path, name, None, version) 771 772 def get_accessor_number(self, path, name): 773 if self.attr_accessors.has_key(path) and self.attr_accessors[path].has_key(name): 774 return self.attr_accessors[path][name] 775 else: 776 return 0 777 778 def update_accessor_number(self, path, name): 779 if name: 780 init_item(self.attr_accessors, path, dict) 781 init_item(self.attr_accessors[path], name, lambda: 0) 782 self.attr_accessors[path][name] += 1 783 784 def process_class_node(self, n): 785 786 "Process the given class node 'n'." 787 788 class_name = self.get_object_path(n.name) 789 790 # Where a class is set conditionally or where the name may refer to 791 # different values, assign the name. 792 793 ref = self.importer.identify(class_name) 794 795 if not ref.static(): 796 self.process_assignment_for_object(n.name, 797 make_expression("__ATTRVALUE(&%s)" % encode_path(class_name))) 798 799 self.enter_namespace(n.name) 800 801 if self.have_object(): 802 self.write_comment("Class: %s" % class_name) 803 804 self.initialise_inherited_members(class_name) 805 806 self.process_structure(n) 807 self.write_comment("End class: %s" % class_name) 808 809 self.exit_namespace() 810 811 def initialise_inherited_members(self, class_name): 812 813 "Initialise members of 'class_name' inherited from its ancestors." 814 815 for name, path in self.importer.all_class_attrs[class_name].items(): 816 target = "%s.%s" % (class_name, name) 817 818 # Ignore attributes with definitions. 819 820 ref = self.importer.identify(target) 821 if ref: 822 continue 823 824 # Ignore special type attributes. 825 826 if is_type_attribute(name): 827 continue 828 829 # Reference inherited attributes. 830 831 ref = self.importer.identify(path) 832 if ref and not ref.static(): 833 parent, attrname = path.rsplit(".", 1) 834 835 self.writestmt("__store_via_attr_ref(__get_object_attr_ref(&%s, %s), __load_via_object(&%s, %s));" % ( 836 encode_path(class_name), name, 837 encode_path(parent), attrname 838 )) 839 840 def process_from_node(self, n): 841 842 "Process the given node 'n', importing from another module." 843 844 path = self.get_namespace_path() 845 846 # Attempt to obtain the referenced objects. 847 848 for name, alias in n.names: 849 if name == "*": 850 raise InspectError("Only explicitly specified names can be imported from modules.", path, n) 851 852 # Obtain the path of the assigned name. 853 854 objpath = self.get_object_path(alias or name) 855 856 # Obtain the identity of the name. 857 858 ref = self.importer.identify(objpath) 859 860 # Where the name is not static, assign the value. 861 862 if ref and not ref.static() and ref.get_name(): 863 self.writestmt("%s;" % 864 TrResolvedNameRef(alias or name, Reference("<var>", None, objpath), 865 expr=TrResolvedNameRef(name, ref))) 866 867 def process_function_body_node(self, n): 868 869 """ 870 Process the given function, lambda, if expression or list comprehension 871 node 'n', generating the body. 872 """ 873 874 function_name = self.get_namespace_path() 875 self.start_function(function_name) 876 877 # Process the function body. 878 879 in_conditional = self.in_conditional 880 self.in_conditional = False 881 882 # Reset temporary storage counters and limits. 883 884 self.reset_temp_limits() 885 886 # Reset result target storage details. To be effective, storage 887 # locations are not reused between statements. 888 889 self.max_result_target = 0 890 self.result_target = 0 891 892 # Volatile locals for exception handling. 893 894 self.volatile_locals = set() 895 896 # Process any guards defined for the parameters. 897 898 for name in self.importer.function_parameters.get(function_name): 899 self.generate_guard(name) 900 901 # Also support self in methods, since some mix-in methods may only work 902 # with certain descendant classes. 903 904 if self.in_method(): 905 self.generate_guard("self") 906 907 # Make assignments for .name entries in the parameters, provided this is 908 # a method. 909 910 if self.in_method(): 911 for name in self.importer.function_attr_initialisers.get(function_name) or []: 912 913 # Treat each assignment as a separate statement. 914 915 self.reset_temp_counters() 916 917 self.process_assignment_node( 918 compiler.ast.AssAttr(compiler.ast.Name("self"), name, "OP_ASSIGN"), 919 compiler.ast.Name(name)) 920 921 # Produce the body and any additional return statement. 922 923 is_lambda = isinstance(n, compiler.ast.Lambda) 924 925 expr = self.process_statement_node(n.code, is_lambda) or \ 926 self.in_method() and \ 927 function_name.rsplit(".", 1)[-1] == "__init__" and \ 928 TrResolvedNameRef("self", self.importer.function_locals[function_name]["self"]) or \ 929 PredefinedConstantRef("None") 930 931 if not isinstance(expr, ReturnRef): 932 self.writestmt("return %s;" % expr) 933 934 self.in_conditional = in_conditional 935 936 self.end_function(function_name) 937 938 def generate_guard(self, name): 939 940 """ 941 Get the accessor details for 'name', found in the current namespace, and 942 generate any guards defined for it. 943 """ 944 945 # Obtain the location, keeping track of assignment versions. 946 947 location = self.get_accessor_location(name) 948 test = self.deducer.accessor_guard_tests.get(location) 949 950 # Generate any guard from the deduced information. 951 952 if test: 953 guard, guard_type = test 954 955 if guard == "specific": 956 ref = first(self.deducer.accessor_all_types[location]) 957 argstr = "&%s" % encode_path(ref.get_origin()) 958 elif guard == "common": 959 ref = first(self.deducer.accessor_all_general_types[location]) 960 argstr = encode_path(encode_type_attribute(ref.get_origin())) 961 else: 962 return 963 964 # Write a test that raises a TypeError upon failure. 965 966 self.writestmt("if (!__test_%s_%s(__VALUE(%s), %s)) __raise_type_error();" % ( 967 guard, guard_type, encode_path(name), argstr)) 968 969 def process_function_node(self, n): 970 971 """ 972 Process the given function, lambda, if expression or list comprehension 973 node 'n', generating any initialisation statements. 974 """ 975 976 # Where a function is declared conditionally, use a separate name for 977 # the definition, and assign the definition to the stated name. 978 979 original_name = n.name 980 981 if self.in_conditional or self.in_function: 982 name = self.get_lambda_name() 983 else: 984 name = n.name 985 986 objpath = self.get_object_path(name) 987 988 # Obtain details of the defaults. 989 990 defaults = self.process_function_defaults(n, name, objpath) 991 if defaults: 992 for default in defaults: 993 self.writeline("%s;" % default) 994 995 # Where a function is set conditionally or where the name may refer to 996 # different values, assign the name. 997 998 ref = self.importer.identify(objpath) 999 1000 if self.in_conditional or self.in_function: 1001 self.process_assignment_for_object(original_name, compiler.ast.Name(name)) 1002 elif not ref.static(): 1003 context = self.is_method(objpath) 1004 1005 self.process_assignment_for_object(original_name, 1006 make_expression("__ATTRVALUE(&%s)" % encode_path(objpath))) 1007 1008 def process_function_defaults(self, n, name, objpath, instance_name=None): 1009 1010 """ 1011 Process the given function or lambda node 'n', initialising defaults 1012 that are dynamically set. The given 'name' indicates the name of the 1013 function. The given 'objpath' indicates the origin of the function. 1014 The given 'instance_name' indicates the name of any separate instance 1015 of the function created to hold the defaults. 1016 1017 Return a list of operations setting defaults on a function instance. 1018 """ 1019 1020 function_name = self.get_object_path(name) 1021 function_defaults = self.importer.function_defaults.get(function_name) 1022 if not function_defaults: 1023 return None 1024 1025 # Determine whether any unidentified defaults are involved. 1026 1027 for argname, default in function_defaults: 1028 if not default.static(): 1029 break 1030 else: 1031 return None 1032 1033 # Handle bound methods. 1034 1035 if not instance_name: 1036 instance_name = "&%s" % encode_path(objpath) 1037 else: 1038 instance_name = "__VALUE(%s)" % instance_name 1039 1040 # Where defaults are involved but cannot be identified, obtain a new 1041 # instance of the lambda and populate the defaults. 1042 1043 defaults = [] 1044 1045 # Join the original defaults with the inspected defaults. 1046 1047 original_defaults = [(argname, default) for (argname, default) in compiler.ast.get_defaults(n) if default] 1048 1049 for i, (original, inspected) in enumerate(map(None, original_defaults, function_defaults)): 1050 1051 # Obtain any reference for the default. 1052 1053 if original: 1054 argname, default = original 1055 name_ref = self.process_structure_node(default) 1056 elif inspected: 1057 argname, default = inspected 1058 name_ref = TrResolvedNameRef(argname, default) 1059 else: 1060 continue 1061 1062 # Generate default initialisers except when constants are employed. 1063 # Constants should be used when populating the function structures. 1064 1065 if name_ref and not isinstance(name_ref, TrConstantValueRef): 1066 defaults.append("__SETDEFAULT(%s, %s, %s)" % (instance_name, i, name_ref)) 1067 1068 return defaults 1069 1070 def process_if_node(self, n): 1071 1072 """ 1073 Process the given "if" node 'n'. 1074 """ 1075 1076 first = True 1077 for test, body in n.tests: 1078 test_ref = self.process_statement_node(test) 1079 self.start_if(first, test_ref) 1080 1081 in_conditional = self.in_conditional 1082 self.in_conditional = True 1083 self.process_statement_node(body) 1084 self.in_conditional = in_conditional 1085 1086 self.end_if() 1087 first = False 1088 1089 if n.else_: 1090 self.start_else() 1091 self.process_statement_node(n.else_) 1092 self.end_else() 1093 1094 print >>self.out 1095 1096 def process_invocation_node(self, n): 1097 1098 "Process the given invocation node 'n'." 1099 1100 # Process the expression. 1101 1102 expr = self.process_structure_node(n.node) 1103 1104 # Obtain details of the invocation expression. 1105 1106 objpath = expr.get_origin() 1107 location = expr.access_location() 1108 refs = expr.references() 1109 1110 # Identified target details. 1111 1112 target = None 1113 target_structure = None 1114 1115 # Specific function target information. 1116 1117 function = None 1118 1119 # Instantiation involvement. 1120 1121 instantiation = False 1122 literal_instantiation = False 1123 1124 # Invocation requirements. 1125 1126 context_required = True 1127 have_access_context = isinstance(expr, AttrResult) 1128 1129 # The context identity is merely the thing providing the context. 1130 # A verified context is one that does not need further testing for 1131 # suitability. 1132 1133 context_identity = have_access_context and expr.context() 1134 context_verified = have_access_context and expr.context_verified() 1135 1136 # The presence of any test operations in the accessor expression. 1137 # With such operations present, the expression cannot be eliminated. 1138 1139 tests_accessor = have_access_context and expr.tests_accessor() 1140 stores_accessor = have_access_context and expr.stores_accessor() 1141 1142 # Parameter details and parameter list dimensions. 1143 1144 parameters = None 1145 num_parameters = None 1146 num_defaults = None 1147 1148 # Obtain details of the callable and of its parameters. 1149 1150 # Literals may be instantiated specially. 1151 1152 if expr.is_name() and expr.name.startswith("$L") and objpath: 1153 instantiation = literal_instantiation = objpath 1154 target = encode_literal_instantiator(objpath) 1155 context_required = False 1156 1157 # Identified targets employ function pointers directly. 1158 1159 elif objpath: 1160 parameters = self.importer.function_parameters.get(objpath) 1161 function_defaults = self.importer.function_defaults.get(objpath) 1162 num_parameters = parameters and len(parameters) or 0 1163 num_defaults = function_defaults and len(function_defaults) or 0 1164 1165 # Class invocation involves instantiators. 1166 1167 if expr.has_kind("<class>"): 1168 instantiation = objpath 1169 target = encode_instantiator_pointer(objpath) 1170 init_ref = self.importer.all_class_attrs[objpath]["__init__"] 1171 target_structure = "&%s" % encode_path(init_ref) 1172 context_required = False 1173 1174 # Only plain functions and bound methods employ function pointers. 1175 1176 elif expr.has_kind("<function>"): 1177 function = objpath 1178 1179 # Test for functions and methods. 1180 1181 context_required = self.is_method(objpath) 1182 1183 accessor_kinds = location and self.get_accessor_kinds(location) 1184 1185 instance_accessor = accessor_kinds and \ 1186 len(accessor_kinds) == 1 and \ 1187 first(accessor_kinds) == "<instance>" 1188 1189 # Only identify certain bound methods or functions. 1190 1191 if not context_required or instance_accessor: 1192 target = encode_function_pointer(objpath) 1193 1194 # Access bound method defaults even if it is not clear whether 1195 # the accessor is appropriate. 1196 1197 target_structure = "&%s" % encode_path(objpath) 1198 1199 # Other targets are retrieved at run-time. 1200 1201 else: 1202 if location: 1203 attrnames = location.attrnames 1204 attrname = attrnames and attrnames.rsplit(".", 1)[-1] 1205 1206 # Determine common aspects of any identifiable targets. 1207 1208 if attrname or refs: 1209 all_params = set() 1210 all_defaults = set() 1211 min_params = set() 1212 max_params = set() 1213 1214 # Employ references from the expression or find all 1215 # possible attributes for the given attribute name. 1216 1217 refs = refs or self.get_attributes_for_attrname(attrname) 1218 1219 # Obtain parameters and defaults for each possible target. 1220 1221 for ref in refs: 1222 origin = ref.get_origin() 1223 params = self.importer.function_parameters.get(origin) 1224 1225 defaults = self.importer.function_defaults.get(origin) 1226 if defaults is not None: 1227 all_defaults.add(tuple(defaults)) 1228 1229 if params is not None: 1230 all_params.add(tuple(params)) 1231 min_params.add(len(params) - (defaults and len(defaults) or 0)) 1232 max_params.add(len(params)) 1233 else: 1234 refs = set() 1235 break 1236 1237 # Where the parameters and defaults are always the same, 1238 # permit populating them in advance. 1239 1240 if refs: 1241 if self.uses_keyword_arguments(n): 1242 if len(all_params) == 1 and (not all_defaults or len(all_defaults) == 1): 1243 parameters = first(all_params) 1244 function_defaults = all_defaults and first(all_defaults) or [] 1245 num_parameters = parameters and len(parameters) or 0 1246 num_defaults = function_defaults and len(function_defaults) or 0 1247 else: 1248 if len(min_params) == 1 and len(max_params) == 1: 1249 num_parameters = first(max_params) 1250 num_defaults = first(max_params) - first(min_params) 1251 1252 # Some information about the target may be available and be used to 1253 # provide warnings about argument compatibility. 1254 1255 if self.importer.give_warning("args"): 1256 unsuitable = self.get_referenced_attribute_invocations(location) 1257 1258 if unsuitable: 1259 for ref in unsuitable: 1260 _objpath = ref.get_origin() 1261 print >>sys.stderr, \ 1262 "In %s, at line %d, inappropriate number of " \ 1263 "arguments given. Need %d arguments to call %s." % ( 1264 self.get_namespace_path(), n.lineno, 1265 len(self.importer.function_parameters[_objpath]), 1266 _objpath) 1267 1268 # Logical statement about available parameter information. 1269 1270 known_parameters = num_parameters is not None 1271 1272 # The source of context information: target or temporary. 1273 1274 need_context_target = context_required and not have_access_context 1275 1276 need_context_stored = context_required and context_identity and \ 1277 context_identity.startswith("__get_context") 1278 1279 # Determine any readily-accessible target identity. 1280 1281 target_named = expr.is_name() and str(expr) or None 1282 target_identity = target or target_named 1283 1284 # Use of target information to populate defaults. 1285 1286 defaults_target_var = not (parameters and function_defaults is not None) and \ 1287 known_parameters and len(n.args) < num_parameters 1288 1289 # Use of a temporary target variable in these situations: 1290 # 1291 # A target provided by an expression needed for defaults. 1292 # 1293 # A target providing the context but not using a name to do so. 1294 # 1295 # A target expression involving the definition of a context which may 1296 # then be evaluated and stored to ensure that the context is available 1297 # during argument evaluation. 1298 # 1299 # An expression featuring an accessor test. 1300 1301 need_target_stored = defaults_target_var and not target_identity or \ 1302 need_context_target and not target_identity or \ 1303 need_context_stored or \ 1304 tests_accessor and not target 1305 1306 # Define stored target details. 1307 1308 target_stored = "__tmp_targets[%d]" % self.function_target 1309 target_var = need_target_stored and target_stored or target_identity 1310 1311 if need_target_stored: 1312 self.record_temp("__tmp_targets") 1313 1314 if need_context_stored: 1315 self.record_temp("__tmp_contexts") 1316 1317 if stores_accessor: 1318 self.record_temp("__tmp_values") 1319 1320 # Employ result targets only in functions. 1321 1322 if self.in_function: 1323 if self.result_target_name: 1324 result_target = self.result_target_name 1325 self.result_target_name = None 1326 else: 1327 result_target = "__tmp_results[%d]" % self.result_target 1328 1329 # Reserve a temporary result target only if it will be used. 1330 1331 if not literal_instantiation: 1332 self.next_temp("__tmp_results") 1333 else: 1334 result_target = None 1335 1336 # Arguments are presented in a temporary frame array with any context 1337 # always being the first argument. Where it would be unused, it may be 1338 # set to null. 1339 1340 if context_required: 1341 if have_access_context: 1342 context_arg = context_identity 1343 else: 1344 context_arg = "__CONTEXT_AS_VALUE(%s)" % target_var 1345 else: 1346 context_arg = "__NULL" 1347 1348 # Start with result target and context arguments for each invocation. 1349 1350 args = [result_target or "__NULL", context_arg] 1351 reserved_args = 2 1352 1353 # Complete the array with null values, permitting tests for a complete 1354 # set of arguments. 1355 1356 args += [None] * (num_parameters is None and len(n.args) or num_parameters is not None and num_parameters or 0) 1357 kwcodes = [] 1358 kwargs = [] 1359 1360 # Any invocations in the arguments will store target details in a 1361 # different location. 1362 1363 function_target = self.function_target 1364 context_index = self.context_index 1365 accessor_index = self.accessor_index 1366 1367 if need_target_stored: 1368 self.next_target() 1369 1370 if need_context_stored: 1371 self.next_context() 1372 1373 if stores_accessor: 1374 self.next_accessor() 1375 1376 in_parameter_list = self.in_parameter_list 1377 self.in_parameter_list = True 1378 1379 for i, arg in enumerate(n.args): 1380 argexpr = self.process_structure_node(arg) 1381 1382 # Convert any attributes indicating value replacement. 1383 1384 if isinstance(argexpr, InvocationResult) and argexpr.result_target: 1385 argexprstr = "__set_attr(&%s, %s)" % (argexpr.result_target, argexpr) 1386 else: 1387 argexprstr = str(argexpr) 1388 1389 # Store a keyword argument, either in the argument list or 1390 # in a separate keyword argument list for subsequent lookup. 1391 1392 if isinstance(arg, compiler.ast.Keyword): 1393 1394 # With knowledge of the target, store the keyword 1395 # argument directly. 1396 1397 if parameters: 1398 try: 1399 argnum = parameters.index(arg.name) 1400 except ValueError: 1401 raise TranslateError("Argument %s is not recognised." % arg.name, 1402 self.get_namespace_path(), n) 1403 args[argnum + reserved_args] = argexprstr 1404 1405 # Otherwise, store the details in a separate collection. 1406 1407 else: 1408 kwargs.append(argexprstr) 1409 kwcodes.append("{%s, %s}" % ( 1410 encode_ppos(arg.name), encode_pcode(arg.name))) 1411 1412 # Store non-keyword arguments in the argument list, rejecting 1413 # superfluous arguments. 1414 1415 else: 1416 try: 1417 args[i + reserved_args] = argexprstr 1418 except IndexError: 1419 raise TranslateError("Too many arguments specified.", 1420 self.get_namespace_path(), n) 1421 1422 # Reference the current target again. 1423 1424 self.in_parameter_list = in_parameter_list 1425 1426 if not self.in_parameter_list: 1427 self.function_target = function_target 1428 self.context_index = context_index 1429 self.accessor_index = accessor_index 1430 1431 # Defaults are added to the frame where arguments are missing. 1432 1433 if parameters and function_defaults is not None: 1434 1435 # Visit each default and set any missing arguments. Where keyword 1436 # arguments have been used, the defaults must be inspected and, if 1437 # necessary, inserted into gaps in the argument list. 1438 1439 for i, (argname, default) in enumerate(function_defaults): 1440 argnum = parameters.index(argname) 1441 if not args[argnum + reserved_args]: 1442 args[argnum + reserved_args] = "__GETDEFAULT(%s, %d)" % (target_structure, i) 1443 1444 elif known_parameters: 1445 1446 # No specific parameter details are provided, but no keyword 1447 # arguments are used. Thus, defaults can be supplied using position 1448 # information only. 1449 1450 i = len(n.args) 1451 pos = i - (num_parameters - num_defaults) 1452 while i < num_parameters: 1453 args[i + reserved_args] = "__GETDEFAULT(%s.value, %d)" % (target_var, pos) 1454 i += 1 1455 pos += 1 1456 1457 # Test for missing arguments. 1458 1459 if None in args: 1460 raise TranslateError("Not all arguments supplied.", 1461 self.get_namespace_path(), n) 1462 1463 # Encode the arguments. 1464 1465 # Where literal instantiation is occurring, add an argument indicating 1466 # the number of values. The result target and context are excluded. 1467 1468 if literal_instantiation: 1469 argstr = "%d, %s" % (len(args) - reserved_args, ", ".join(args[reserved_args:])) 1470 else: 1471 argstr = ", ".join(args) 1472 1473 kwargstr = kwargs and ("__ARGS(%s)" % ", ".join(kwargs)) or "0" 1474 kwcodestr = kwcodes and ("__KWARGS(%s)" % ", ".join(kwcodes)) or "0" 1475 1476 # First, the invocation expression is presented. 1477 1478 stages = [] 1479 emit = stages.append 1480 1481 # Assign and yield any stored target. 1482 # The context may be set in the expression. 1483 1484 if need_target_stored: 1485 emit("%s = %s" % (target_var, expr)) 1486 target_expr = target_var 1487 1488 # Otherwise, retain the expression for later use. 1489 1490 else: 1491 target_expr = str(expr) 1492 1493 # Any specific callable is then obtained for invocation. 1494 1495 if target: 1496 1497 # An expression involving a test of the accessor providing the target. 1498 # This must be emitted in order to perform the test. 1499 1500 if tests_accessor: 1501 emit(str(expr)) 1502 1503 emit(target) 1504 1505 # Methods accessed via unidentified accessors are obtained for 1506 # invocation. 1507 1508 elif function: 1509 if context_required: 1510 1511 # Avoid further context testing if appropriate. 1512 1513 if have_access_context and context_verified: 1514 emit("__get_function_member(%s)" % target_expr) 1515 1516 # Otherwise, test the context for the function/method. 1517 1518 else: 1519 emit("__get_function(%s, %s)" % (context_arg, target_expr)) 1520 else: 1521 emit("_get_function_member(%s)" % target_expr) 1522 1523 # With known parameters, the target can be tested. 1524 1525 elif known_parameters: 1526 if self.always_callable(refs): 1527 if context_verified: 1528 emit("__get_function_member(%s)" % target_expr) 1529 else: 1530 emit("__get_function(%s, %s)" % (context_arg, target_expr)) 1531 else: 1532 emit("__check_and_get_function(%s, %s)" % (context_arg, target_expr)) 1533 1534 # With a known target, the function is obtained directly and called. 1535 # By putting the invocation at the end of the final element in the 1536 # instruction sequence (the stages), the result becomes the result of 1537 # the sequence. Moreover, the parameters become part of the sequence 1538 # and thereby participate in a guaranteed evaluation order. 1539 1540 if target or function or known_parameters: 1541 stages[-1] += "(%s)" % argstr 1542 if instantiation: 1543 return InstantiationResult(instantiation, stages) 1544 else: 1545 return InvocationResult(result_target, stages) 1546 1547 # With unknown targets, the generic invocation function is applied to 1548 # the callable and argument collections. 1549 1550 else: 1551 emit("__invoke(\n%s,\n%d, %d, %s, %s,\n%d, %s\n)" % ( 1552 target_expr, 1553 self.always_callable(refs) and 1 or 0, 1554 len(kwargs), kwcodestr, kwargstr, 1555 len(args), "__ARGS(%s)" % argstr)) 1556 return InvocationResult(result_target, stages) 1557 1558 def reset_temp_counters(self): 1559 1560 "Reset the target counters." 1561 1562 self.function_target = 0 1563 self.context_index = 0 1564 self.accessor_index = 0 1565 self.attribute_ref_index = 0 1566 self.result_target_name = None 1567 1568 def reset_temp_limits(self): 1569 1570 "Reset the target counter limits." 1571 1572 self.max_function_target = 0 1573 self.max_context_index = 0 1574 self.max_accessor_index = 0 1575 self.max_attribute_ref_index = 0 1576 1577 def next_temp(self, name): 1578 1579 "Allocate the next temporary storage element for 'name'." 1580 1581 if name == "__tmp_results": 1582 self.next_result() 1583 elif name == "__tmp_targets": 1584 self.next_target() 1585 elif name == "__tmp_contexts": 1586 self.next_context() 1587 elif name == "__tmp_values": 1588 self.next_accessor() 1589 elif name == "__tmp_attr_refs": 1590 self.next_attribute_ref() 1591 elif name in ("__tmp_private_context", "__tmp_target_value", "__tmp_result"): 1592 pass 1593 else: 1594 raise TranslateError("Temporary storage %s is not recognised." % name, 1595 self.get_namespace_path()) 1596 1597 self.record_temp(name) 1598 1599 def next_result(self): 1600 1601 "Allocate the next result target storage." 1602 1603 self.result_target += 1 1604 self.max_result_target = max(self.result_target, self.max_result_target) 1605 1606 def next_target(self): 1607 1608 "Allocate the next function target storage." 1609 1610 self.function_target += 1 1611 self.max_function_target = max(self.function_target, self.max_function_target) 1612 1613 def next_context(self): 1614 1615 "Allocate the next context value storage." 1616 1617 self.context_index += 1 1618 self.max_context_index = max(self.context_index, self.max_context_index) 1619 1620 def next_accessor(self): 1621 1622 "Allocate the next accessor value storage." 1623 1624 self.accessor_index += 1 1625 self.max_accessor_index = max(self.accessor_index, self.max_accessor_index) 1626 1627 def next_attribute_ref(self): 1628 1629 "Allocate the next attribute reference value storage." 1630 1631 self.attribute_ref_index += 1 1632 self.max_attribute_ref_index = max(self.attribute_ref_index, self.max_attribute_ref_index) 1633 1634 def always_callable(self, refs): 1635 1636 "Determine whether all 'refs' are callable." 1637 1638 if not refs: 1639 return False 1640 1641 for ref in refs: 1642 if not ref.has_kind("<function>") and not self.importer.get_attributes(ref, "__fn__"): 1643 return False 1644 1645 return True 1646 1647 def need_default_arguments(self, objpath, nargs): 1648 1649 """ 1650 Return whether any default arguments are needed when invoking the object 1651 given by 'objpath'. 1652 """ 1653 1654 parameters = self.importer.function_parameters.get(objpath) 1655 return nargs < len(parameters) 1656 1657 def uses_keyword_arguments(self, n): 1658 1659 "Return whether invocation node 'n' uses keyword arguments." 1660 1661 for arg in enumerate(n.args): 1662 if isinstance(arg, compiler.ast.Keyword): 1663 return True 1664 1665 return False 1666 1667 def get_attributes_for_attrname(self, attrname): 1668 1669 "Return a set of all attributes exposed by 'attrname'." 1670 1671 usage = [(attrname, True, False)] 1672 class_types = self.deducer.get_class_types_for_usage(usage) 1673 instance_types = self.deducer.get_instance_types_for_usage(usage) 1674 module_types = self.deducer.get_module_types_for_usage(usage) 1675 attrs = set() 1676 1677 for ref in combine_types(class_types, instance_types, module_types): 1678 attrs.update(self.importer.get_attributes(ref, attrname)) 1679 1680 return attrs 1681 1682 def process_lambda_node(self, n): 1683 1684 "Process the given lambda node 'n'." 1685 1686 name = self.get_lambda_name() 1687 function_name = self.get_object_path(name) 1688 instance_name = "__get_accessor(%d)" % self.accessor_index 1689 1690 defaults = self.process_function_defaults(n, name, function_name, instance_name) 1691 1692 # Without defaults, produce an attribute referring to the function. 1693 1694 if not defaults: 1695 return make_expression("__ATTRVALUE(&%s)" % encode_path(function_name)) 1696 1697 # With defaults, copy the function structure and set the defaults on the 1698 # copy. 1699 1700 else: 1701 self.record_temp("__tmp_values") 1702 accessor_index = self.accessor_index 1703 self.next_accessor() 1704 return make_expression("""\ 1705 (__set_accessor(%d, __ATTRVALUE(__COPY(&%s, sizeof(%s)))), 1706 %s, 1707 __get_accessor(%d))""" % ( 1708 accessor_index, 1709 encode_path(function_name), 1710 encode_symbol("obj", function_name), 1711 ", ".join(defaults), 1712 accessor_index)) 1713 1714 def process_logical_node(self, n): 1715 1716 "Process the given operator node 'n'." 1717 1718 self.record_temp("__tmp_result") 1719 1720 conjunction = isinstance(n, compiler.ast.And) 1721 results = [] 1722 1723 for node in n.nodes: 1724 results.append(self.process_structure_node(node)) 1725 1726 return LogicalOperationResult(results, conjunction) 1727 1728 def process_name_node(self, n, expr=None, process_expr=False): 1729 1730 "Process the given name node 'n' with the optional assignment 'expr'." 1731 1732 # Determine whether the name refers to a static external entity. 1733 1734 if n.name in predefined_constants: 1735 return PredefinedConstantRef(n.name, expr) 1736 1737 # Convert literal references, operator function names, and print 1738 # function names to references. 1739 1740 elif n.name.startswith("$L") or n.name.startswith("$op") or \ 1741 n.name.startswith("$seq") or n.name.startswith("$print"): 1742 1743 ref, paths = self.importer.get_module(self.name).special[n.name] 1744 return TrResolvedNameRef(n.name, ref) 1745 1746 # Get the appropriate name for the name reference, using the same method 1747 # as in the inspector. 1748 1749 path = self.get_namespace_path() 1750 objpath = self.get_object_path(n.name) 1751 1752 # Determine any assigned globals. 1753 1754 globals = self.importer.get_module(self.name).scope_globals.get(path) 1755 1756 # Explicitly declared globals. 1757 1758 if globals and n.name in globals: 1759 objpath = self.get_global_path(n.name) 1760 is_global = True 1761 1762 # Implicitly referenced globals in functions. 1763 1764 elif self.in_function: 1765 is_global = n.name not in self.importer.function_locals[path] 1766 1767 # Implicitly referenced globals elsewhere. 1768 1769 else: 1770 namespace = self.importer.identify(path) 1771 is_global = not self.importer.get_attributes(namespace, n.name) 1772 1773 # Get the static identity of the name. 1774 1775 ref = self.importer.identify(objpath) 1776 if ref and not ref.get_name(): 1777 ref = ref.alias(objpath) 1778 1779 # Obtain any resolved names for non-assignment names. 1780 1781 if not expr and not ref and self.in_function: 1782 locals = self.importer.function_locals.get(path) 1783 ref = locals and locals.get(n.name) 1784 1785 # Find any invocation or alias details. 1786 1787 name = self.get_name_for_tracking(n.name, is_global=is_global) 1788 location = not expr and self.get_access_location(name) or None 1789 1790 # Mark any local assignments as volatile in exception blocks. 1791 1792 if expr and self.in_function and not is_global and self.in_try_except: 1793 self.make_volatile(n.name) 1794 1795 # Set the replacement target. Note that this will not apply to all 1796 # objects, with only floats supporting replaceable values. 1797 1798 if expr: 1799 # Prevent parameters from becoming result targets. Otherwise, they 1800 # may inadvertently cause the modification of the supplied object. 1801 1802 parameters = self.importer.function_parameters.get(path) 1803 1804 if not parameters or n.name not in parameters: 1805 target_ref = TrResolvedNameRef(n.name, ref, is_global=is_global, 1806 location=location) 1807 self.result_target_name = str(target_ref) 1808 else: 1809 self.result_target_name = None 1810 1811 # Expression processing is deferred until after any result target has 1812 # been set. 1813 1814 if process_expr: 1815 expr = self.process_structure_node(expr) 1816 1817 # Qualified names are used for resolved static references or for 1818 # static namespace members. The reference should be configured to return 1819 # such names. 1820 1821 name_ref = TrResolvedNameRef(n.name, ref, expr=expr, is_global=is_global, 1822 location=location) 1823 1824 return not expr and self.get_aliases(name_ref) or name_ref 1825 1826 def get_aliases(self, name_ref): 1827 1828 "Return alias references for the given 'name_ref'." 1829 1830 location = name_ref.access_location() 1831 accessor_locations = self.deducer.access_index.get(location) 1832 1833 if not accessor_locations: 1834 return None 1835 1836 refs = set() 1837 1838 for accessor_location in accessor_locations: 1839 alias_refs = self.deducer.referenced_objects.get(accessor_location) 1840 if alias_refs: 1841 refs.update(alias_refs) 1842 1843 if refs: 1844 return AliasResult(name_ref, refs, location) 1845 else: 1846 return None 1847 1848 def make_volatile(self, name): 1849 1850 "Record 'name' as volatile in the current namespace." 1851 1852 self.volatile_locals.add(name) 1853 1854 def process_not_node(self, n): 1855 1856 "Process the given operator node 'n'." 1857 1858 return self.make_negation(self.process_structure_node(n.expr)) 1859 1860 def process_raise_node(self, n): 1861 1862 "Process the given raise node 'n'." 1863 1864 # NOTE: Determine which raise statement variants should be permitted. 1865 1866 if n.expr1: 1867 1868 # Names with accompanying arguments are treated like invocations. 1869 1870 if n.expr2: 1871 call = compiler.ast.CallFunc(n.expr1, [n.expr2]) 1872 exc = self.process_structure_node(call) 1873 self.writestmt("__Raise(%s);" % exc) 1874 1875 # Raise instances, testing the kind at run-time if necessary and 1876 # instantiating any non-instance. 1877 1878 else: 1879 exc = self.process_structure_node(n.expr1) 1880 1881 if isinstance(exc, TrInstanceRef) or exc.is_well_defined_instance(): 1882 self.writestmt("__Raise(%s);" % exc) 1883 else: 1884 self.writestmt("__Raise(__ensure_instance(%s));" % exc) 1885 else: 1886 self.writestmt("__Throw(__tmp_exc);") 1887 1888 def process_return_node(self, n): 1889 1890 "Process the given return node 'n'." 1891 1892 if self.in_function: 1893 self.result_target_name = "__result" 1894 1895 expr = self.process_structure_node(n.value) or PredefinedConstantRef("None") 1896 1897 if self.in_try_finally or self.in_try_except: 1898 self.writestmt("__Return(%s);" % expr) 1899 else: 1900 self.writestmt("return %s;" % expr) 1901 1902 return ReturnRef() 1903 1904 def process_try_node(self, n): 1905 1906 """ 1907 Process the given "try...except" node 'n'. 1908 """ 1909 1910 in_try_except = self.in_try_except 1911 self.in_try_except = True 1912 1913 # Use macros to implement exception handling. 1914 1915 self.writestmt("__Try") 1916 self.writeline("{") 1917 self.indent += 1 1918 self.process_statement_node(n.body) 1919 1920 # Put the else statement in another try block that handles any raised 1921 # exceptions and converts them to exceptions that will not be handled by 1922 # the main handling block. 1923 1924 if n.else_: 1925 self.writestmt("__Try") 1926 self.writeline("{") 1927 self.indent += 1 1928 self.process_statement_node(n.else_) 1929 self.indent -= 1 1930 self.writeline("}") 1931 self.writeline("__Catch (__tmp_exc)") 1932 self.writeline("{") 1933 self.indent += 1 1934 self.writeline("if (__tmp_exc.raising) __RaiseElse(__tmp_exc.arg);") 1935 self.writeline("else if (__tmp_exc.completing) __Throw(__tmp_exc);") 1936 self.indent -= 1 1937 self.writeline("}") 1938 1939 # Complete the try block and enter the finally block, if appropriate. 1940 1941 if self.in_try_finally: 1942 self.writestmt("__Complete;") 1943 1944 self.indent -= 1 1945 self.writeline("}") 1946 1947 self.in_try_except = in_try_except 1948 1949 # Handlers are tests within a common handler block. 1950 1951 self.writeline("__Catch (__tmp_exc)") 1952 self.writeline("{") 1953 self.indent += 1 1954 1955 # Introduce an if statement to handle the completion of a try block. 1956 1957 self.process_try_completion() 1958 1959 # Handle exceptions in else blocks converted to __RaiseElse, converting 1960 # them back to normal exceptions. 1961 1962 if n.else_: 1963 self.writeline("else if (__tmp_exc.raising_else) __Raise(__tmp_exc.arg);") 1964 1965 # Exception handling. 1966 1967 for name, var, handler in n.handlers: 1968 1969 # Test for specific exceptions. 1970 1971 if name is not None: 1972 name_ref = self.process_statement_node(name) 1973 self.writeline("else if (__ISINSTANCE(__tmp_exc.arg, %s))" % name_ref) 1974 else: 1975 self.writeline("else if (1)") 1976 1977 self.writeline("{") 1978 self.indent += 1 1979 1980 # Establish the local for the handler. 1981 1982 if var is not None: 1983 self.writestmt("%s;" % self.process_name_node(var, make_expression("__tmp_exc.arg"))) 1984 1985 if handler is not None: 1986 self.process_statement_node(handler) 1987 1988 self.indent -= 1 1989 self.writeline("}") 1990 1991 # Re-raise unhandled exceptions. 1992 1993 self.writeline("else __Throw(__tmp_exc);") 1994 1995 # End the handler block. 1996 1997 self.indent -= 1 1998 self.writeline("}") 1999 print >>self.out 2000 2001 def process_try_finally_node(self, n): 2002 2003 """ 2004 Process the given "try...finally" node 'n'. 2005 """ 2006 2007 in_try_finally = self.in_try_finally 2008 self.in_try_finally = True 2009 2010 # Use macros to implement exception handling. 2011 2012 self.writestmt("__Try") 2013 self.writeline("{") 2014 self.indent += 1 2015 self.process_statement_node(n.body) 2016 self.indent -= 1 2017 self.writeline("}") 2018 2019 self.in_try_finally = in_try_finally 2020 2021 # Finally clauses handle special exceptions. 2022 2023 self.writeline("__Catch (__tmp_exc)") 2024 self.writeline("{") 2025 self.indent += 1 2026 self.process_statement_node(n.final) 2027 2028 # Introduce an if statement to handle the completion of a try block. 2029 2030 self.process_try_completion() 2031 self.writeline("else __Throw(__tmp_exc);") 2032 2033 self.indent -= 1 2034 self.writeline("}") 2035 print >>self.out 2036 2037 def process_try_completion(self): 2038 2039 "Generate a test for the completion of a try block." 2040 2041 self.writestmt("if (__tmp_exc.completing)") 2042 self.writeline("{") 2043 self.indent += 1 2044 2045 # Do not return anything at the module level. 2046 2047 if self.get_namespace_path() != self.name: 2048 2049 # Only use the normal return statement if no surrounding try blocks 2050 # apply. 2051 2052 if not self.in_try_finally and not self.in_try_except: 2053 self.writeline("if (!__ISNULL(__tmp_exc.arg)) return __tmp_exc.arg;") 2054 else: 2055 self.writeline("if (!__ISNULL(__tmp_exc.arg)) __Throw(__tmp_exc);") 2056 2057 self.indent -= 1 2058 self.writeline("}") 2059 2060 def process_while_node(self, n): 2061 2062 "Process the given while node 'n'." 2063 2064 self.writeline("while (1)") 2065 self.writeline("{") 2066 self.indent += 1 2067 test = self.process_statement_node(n.test) 2068 2069 # Emit the loop termination condition unless "while <true value>" is 2070 # indicated. 2071 2072 if not (isinstance(test, PredefinedConstantRef) and test.value): 2073 2074 # Emit a negated test of the continuation condition. 2075 2076 self.start_if(True, self.make_negation(test)) 2077 if n.else_: 2078 self.process_statement_node(n.else_) 2079 self.writestmt("break;") 2080 self.end_if() 2081 2082 in_conditional = self.in_conditional 2083 self.in_conditional = True 2084 self.process_statement_node(n.body) 2085 self.in_conditional = in_conditional 2086 2087 self.indent -= 1 2088 self.writeline("}") 2089 print >>self.out 2090 2091 # Special variable usage. 2092 2093 def get_temp_path(self): 2094 2095 """ 2096 Return the appropriate namespace path for temporary names in the current 2097 namespace. 2098 """ 2099 2100 if self.in_function: 2101 return self.get_namespace_path() 2102 else: 2103 return self.name 2104 2105 def record_temp(self, name): 2106 2107 """ 2108 Record the use of the temporary 'name' in the current namespace. At the 2109 class or module level, the temporary name is associated with the module, 2110 since the variable will then be allocated in the module's own main 2111 program. 2112 """ 2113 2114 path = self.get_temp_path() 2115 2116 init_item(self.temp_usage, path, list) 2117 self.temp_usage[path].append(name) 2118 2119 def remove_temps(self, names): 2120 2121 """ 2122 Remove 'names' from temporary storage allocations, each instance 2123 removing each request for storage. 2124 """ 2125 2126 path = self.get_temp_path() 2127 2128 for name in names: 2129 if self.uses_temp(path, name): 2130 self.temp_usage[path].remove(name) 2131 2132 def uses_temp(self, path, name): 2133 2134 """ 2135 Return whether the given namespace 'path' employs a temporary variable 2136 with the given 'name'. Note that 'path' should only be a module or a 2137 function or method, not a class. 2138 """ 2139 2140 return self.temp_usage.has_key(path) and name in self.temp_usage[path] 2141 2142 def make_negation(self, expr): 2143 2144 "Return a negated form of 'expr'." 2145 2146 result = NegationResult(expr) 2147 2148 # Negation discards the temporary results of its operand. 2149 2150 temps = expr.discards_temporary() 2151 if temps: 2152 self.remove_temps(temps) 2153 2154 return result 2155 2156 # Output generation. 2157 2158 def start_output(self): 2159 2160 "Write the declarations at the top of each source file." 2161 2162 print >>self.out, """\ 2163 #include "types.h" 2164 #include "exceptions.h" 2165 #include "ops.h" 2166 #include "progconsts.h" 2167 #include "progops.h" 2168 #include "progtypes.h" 2169 #include "main.h" 2170 """ 2171 2172 def start_unit(self): 2173 2174 "Record output within a generated function for later use." 2175 2176 self.out = StringIO() 2177 2178 def end_unit(self): 2179 2180 "Restore the output stream." 2181 2182 out = self.out 2183 self.out = self.out_toplevel 2184 return out 2185 2186 def flush_unit(self, name, out): 2187 2188 "Add declarations and generated code." 2189 2190 self.write_temporaries(name) 2191 print >>self.out 2192 out.seek(0) 2193 self.out.write(out.read()) 2194 2195 def start_module(self): 2196 2197 "Write the start of each module's main function." 2198 2199 print >>self.out, "void __main_%s()" % encode_path(self.name) 2200 print >>self.out, "{" 2201 self.indent += 1 2202 2203 # Define temporary variables, excluded from the module structure itself. 2204 2205 tempnames = [] 2206 2207 for n in self.importer.all_module_attrs[self.name]: 2208 if n.startswith("$t"): 2209 tempnames.append(encode_path(n)) 2210 2211 if tempnames: 2212 tempnames.sort() 2213 self.writeline("__attr %s;" % ", ".join(tempnames)) 2214 2215 self.start_unit() 2216 2217 def end_module(self): 2218 2219 "End each module by closing its main function." 2220 2221 out = self.end_unit() 2222 self.flush_unit(self.name, out) 2223 2224 self.indent -= 1 2225 print >>self.out, "}" 2226 2227 def start_function(self, name): 2228 2229 "Start the function having the given 'name'." 2230 2231 self.indent += 1 2232 2233 self.start_unit() 2234 2235 def end_function(self, name): 2236 2237 "End the function having the given 'name'." 2238 2239 out = self.end_unit() 2240 2241 # Write the signature at the top indentation level. 2242 2243 self.indent -= 1 2244 self.write_parameters(name) 2245 print >>self.out, "{" 2246 2247 # Obtain local names from parameters. 2248 2249 parameters = self.importer.function_parameters[name] 2250 locals = self.importer.function_locals[name].keys() 2251 names = [] 2252 volatile_names = [] 2253 2254 for n in locals: 2255 2256 # Filter out special names and parameters. Note that self is a local 2257 # regardless of whether it originally appeared in the parameters or 2258 # not. 2259 2260 if n.startswith("$l") or n in parameters or n == "self": 2261 continue 2262 if n in self.volatile_locals: 2263 volatile_names.append("%s = __NULL" % encode_path(n)) 2264 else: 2265 names.append("%s = __NULL" % encode_path(n)) 2266 2267 # Emit required local names at the function indentation level. 2268 2269 self.indent += 1 2270 2271 if names: 2272 names.sort() 2273 self.writeline("__attr %s;" % ", ".join(names)) 2274 2275 if volatile_names: 2276 volatile_names.sort() 2277 self.writeline("volatile __attr %s;" % ", ".join(volatile_names)) 2278 2279 self.flush_unit(name, out) 2280 2281 self.indent -= 1 2282 print >>self.out, "}" 2283 print >>self.out 2284 2285 def write_parameters(self, name): 2286 2287 """ 2288 For the function having the given 'name', write definitions of 2289 parameters found in the arguments array. 2290 """ 2291 2292 # Generate any self reference. 2293 2294 l = [] 2295 l.append("__attr __result") 2296 2297 if self.is_method(name): 2298 l.append("__attr self") 2299 else: 2300 l.append("__attr __self") 2301 2302 # Generate aliases for the parameters. 2303 2304 for parameter in self.importer.function_parameters[name]: 2305 l.append("%s__attr %s" % ( 2306 parameter in self.volatile_locals and "volatile " or "", 2307 encode_path(parameter))) 2308 2309 self.writeline("__attr %s(%s)" % ( 2310 encode_function_pointer(name), ", ".join(l))) 2311 2312 def write_temporaries(self, name): 2313 2314 "Write temporary storage employed by 'name'." 2315 2316 # Provide space for the recorded number of temporary variables. 2317 2318 if self.uses_temp(name, "__tmp_targets") and self.max_function_target: 2319 self.writeline("__attr __tmp_targets[%d];" % self.max_function_target) 2320 2321 if self.uses_temp(name, "__tmp_contexts") and self.max_context_index: 2322 self.writeline("__attr __tmp_contexts[%d];" % self.max_context_index) 2323 2324 if self.uses_temp(name, "__tmp_values") and self.max_accessor_index: 2325 self.writeline("__attr __tmp_values[%d];" % self.max_accessor_index) 2326 2327 if self.uses_temp(name, "__tmp_attr_refs") and self.max_attribute_ref_index: 2328 self.writeline("__attr *__tmp_attr_refs[%d];" % self.max_attribute_ref_index) 2329 2330 if self.uses_temp(name, "__tmp_results") and self.max_result_target: 2331 self.writeline("__attr __tmp_results[%d] = {0};" % self.max_result_target) 2332 2333 if self.uses_temp(name, "__tmp_private_context"): 2334 self.writeline("__attr __tmp_private_context;") 2335 if self.uses_temp(name, "__tmp_target_value"): 2336 self.writeline("__attr __tmp_target_value;") 2337 if self.uses_temp(name, "__tmp_result"): 2338 self.writeline("__attr __tmp_result;") 2339 2340 module = self.importer.get_module(self.name) 2341 2342 if name in module.exception_namespaces: 2343 self.writeline("__exc __tmp_exc;") 2344 2345 def start_if(self, first, test_ref): 2346 statement = "%sif" % (not first and "else " or "") 2347 2348 # Consume logical results directly. 2349 2350 if isinstance(test_ref, LogicalResult): 2351 self.writeline("%s %s" % (statement, test_ref.apply_test())) 2352 temps = test_ref.discards_temporary() 2353 if temps: 2354 self.remove_temps(temps) 2355 else: 2356 self.writeline("%s (__BOOL(%s))" % (statement, test_ref)) 2357 2358 self.writeline("{") 2359 self.indent += 1 2360 2361 def end_if(self): 2362 self.indent -= 1 2363 self.writeline("}") 2364 2365 def start_else(self): 2366 self.writeline("else") 2367 self.writeline("{") 2368 self.indent += 1 2369 2370 def end_else(self): 2371 self.indent -= 1 2372 self.writeline("}") 2373 2374 def statement(self, expr): 2375 s = str(expr) 2376 if s: 2377 self.writestmt("%s;" % s) 2378 2379 def statements(self, results): 2380 for result in results: 2381 self.statement(result) 2382 2383 def writeline(self, s): 2384 print >>self.out, "%s%s" % (self.pad(), self.indenttext(s, self.indent + 1)) 2385 2386 def writestmt(self, s): 2387 self.writeline(s) 2388 2389 def write_comment(self, s): 2390 self.writestmt("/* %s */" % s) 2391 2392 def pad(self, extra=0): 2393 return (self.indent + extra) * self.tabstop 2394 2395 def indenttext(self, s, levels): 2396 lines = s.split("\n") 2397 out = [lines[0]] 2398 for line in lines[1:]: 2399 out.append(levels * self.tabstop + line) 2400 if line.endswith("("): 2401 levels += 1 2402 elif line.startswith(")"): 2403 levels -= 1 2404 return "\n".join(out) 2405 2406 # vim: tabstop=4 expandtab shiftwidth=4