1 #!/usr/bin/env python 2 3 """ 4 The micropython package for processing Python source code. The code originates 5 from the simplify package but has had various details related to that package 6 removed. 7 8 Copyright (C) 2006, 2007, 2008, 2009 Paul Boddie <paul@boddie.org.uk> 9 10 This program is free software; you can redistribute it and/or modify it under 11 the terms of the GNU General Public License as published by the Free Software 12 Foundation; either version 3 of the License, or (at your option) any later 13 version. 14 15 This program is distributed in the hope that it will be useful, but WITHOUT 16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 17 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 18 details. 19 20 You should have received a copy of the GNU General Public License along with 21 this program. If not, see <http://www.gnu.org/licenses/>. 22 23 -------- 24 25 To use this module, an importer should be constructed. Here, the standard path 26 for module searching is employed: 27 28 importer = Importer(sys.path) 29 30 To generate programs, the above importer should be supplied in the 31 initialisation of a program instance, and then various methods are called: 32 33 program = Program(importer) 34 image = program.get_raw_image() 35 36 Such importer and program objects are the most convenient mechanism through 37 which the functionality of the micropython package may be accessed. 38 """ 39 40 from micropython.common import ProcessingError, TableGenerationError 41 import micropython.ast 42 import micropython.data 43 import micropython.opt 44 import micropython.inspect 45 import micropython.table 46 import os 47 48 try: 49 set 50 except NameError: 51 from sets import Set as set 52 53 class Program: 54 55 "This class supports the generation of a program image." 56 57 supported_optimisations = micropython.opt.Optimiser.supported_optimisations 58 59 def __init__(self, importer, optimisations=None): 60 61 """ 62 Initialise the program representation with an 'importer' which is able 63 to locate and load Python modules. 64 65 The optional 'optimisations' cause certain techniques to be used in 66 reducing program size and improving program efficiency. 67 """ 68 69 self.importer = importer 70 self.optimisations = optimisations or set() 71 72 # Remember the tables once generated. 73 74 self.objtable = None 75 self.paramtable = None 76 77 # Main program information. 78 79 self.code = None 80 self.code_location = None 81 82 def get_importer(self): 83 return self.importer 84 85 # Access to finalised program information. 86 87 def get_image(self, with_builtins=0): 88 89 """ 90 Return the program image including built-in objects if 'with_builtins' 91 is specified and set to a true value. 92 """ 93 94 if self.code is not None: 95 return self.code 96 97 objtable = self.get_object_table() 98 paramtable = self.get_parameter_table() 99 100 # Optimise and regenerate the object table. 101 102 self.importer.vacuum(objtable) 103 self.importer.finalise() 104 105 objtable = self.get_object_table(reset=1) 106 paramtable = self.get_parameter_table(reset=1) 107 108 self.code = [] 109 110 # Append constants to the image. 111 112 for const in self.importer.constants(): 113 self.code.append(const) 114 115 last_module = self.importer.modules_ordered[-1] 116 117 for module in self.importer.modules_ordered: 118 suppress_builtins = not with_builtins and module.name == "__builtins__" 119 120 # Position the module in the image and make a translation. 121 122 trans = micropython.ast.Translation(module, self) 123 124 # Add header details. 125 126 self.code.append(module) 127 128 # Append module attributes to the image. 129 130 attributes = module.module_attributes() 131 self.code += module.attributes_as_list() 132 133 # Append classes and functions to the image. 134 135 for obj in module.all_objects: 136 if isinstance(obj, micropython.inspect.Class): 137 138 # Add header details. 139 140 self.code.append(obj) 141 142 # Append class attributes to the image. 143 144 attributes = obj.class_attributes() 145 self.code += obj.attributes_as_list() 146 147 # Omit built-in function code where requested. 148 149 if suppress_builtins and obj.astnode.doc is None: 150 continue 151 152 # Generate the instantiator/initialiser. 153 # Append the function code to the image. 154 155 instantiator = obj.get_instantiator() 156 code = trans.get_instantiator_code(obj) 157 self.code += code 158 159 # Class-level code is generated separately at the module 160 # level, and the code location is set within the code 161 # generation process for the module. 162 163 elif isinstance(obj, micropython.inspect.Function): 164 165 # Add header details. 166 167 self.code.append(obj) 168 169 # Append any default values to the image. 170 # Only do this for named functions (not lambdas). 171 172 if obj.name is not None: 173 self.code += obj.default_attrs 174 175 # Omit built-in function code where requested. 176 177 if suppress_builtins and obj.astnode.doc is None: 178 pass 179 180 # Append the function code to the image. 181 182 else: 183 code = trans.get_code(obj) 184 self.code += code 185 186 # Omit built-in module code where requested. 187 188 if suppress_builtins: 189 pass 190 191 # Append the module top-level code to the image. 192 193 else: 194 code = trans.get_module_code() 195 self.code += code 196 197 return self.code 198 199 def get_raw_image(self, architecture=None, with_builtins=0): 200 201 "Return the raw image representation of the program." 202 203 architecture = architecture or micropython.rsvp 204 205 self.get_image(with_builtins) 206 207 objtable = self.get_object_table() 208 paramtable = self.get_parameter_table() 209 210 # Position the objects. 211 212 pos = 0 213 214 for item in self.code: 215 arch_item = architecture.get_object(item) 216 217 # Get the raw version for the architecture. 218 219 if arch_item is not None: 220 pos = arch_item.set_location(pos, with_builtins) 221 else: 222 pos += 1 223 224 # Generate the raw code. 225 226 self.raw_code = [] 227 228 for item in self.code: 229 arch_item = architecture.get_object(item) 230 231 # Get the raw version for the architecture. 232 233 if arch_item is not None: 234 self.raw_code += arch_item.as_raw(objtable, paramtable, with_builtins) 235 arch_item.finalise_location(with_builtins) 236 else: 237 self.raw_code.append(item) 238 239 # Fix the module locations. 240 241 for module in self.importer.modules_ordered: 242 243 if not with_builtins and module.name == "__builtins__": 244 continue 245 246 module.code_location = module.blocks[0].location 247 248 self.code_location = self.importer.modules["__main__"].code_location 249 return self.raw_code 250 251 def get_object_table(self, reset=0): 252 253 "Return a table with details of attributes for classes and modules." 254 255 if self.objtable is None or reset: 256 257 t = self.objtable = micropython.table.ObjectTable() 258 for module in self.importer.get_modules(): 259 t.add(module.full_name(), module.module_attributes()) 260 261 # Add class and instance attributes for all classes, together 262 # with descendant information. 263 264 for obj in module.all_objects: 265 if isinstance(obj, micropython.inspect.Class): 266 267 # Prevent ambiguous classes. 268 269 full_name = obj.full_name() 270 name = obj.name 271 272 if module.has_key(name) and module[name].defines_ambiguous_class(): 273 raise TableGenerationError, "Class %r in module %r is ambiguously defined." % (name, module.full_name()) 274 275 # Define a table entry for the class. 276 277 attributes = {full_name : obj} 278 attributes.update(obj.all_attributes()) 279 attributes.update(obj.all_descendants()) 280 t.add(full_name, attributes) 281 282 return self.objtable 283 284 def get_parameter_table(self, reset=0): 285 286 "Return a table with details of parameters for functions and methods." 287 288 # Need the object table to get at class details. 289 290 if self.paramtable is None or reset: 291 t = self.paramtable = micropython.table.ParameterTable() 292 293 # Visit each module, getting function and method details. 294 295 for module in self.importer.get_modules(): 296 for obj in module.all_objects: 297 if isinstance(obj, micropython.inspect.Function): 298 t.add(obj.full_name(), obj.parameters()) 299 300 # Classes are callable, too. 301 # Take details of the appropriate __init__ method to make an 302 # entry for an instantiation function for the class. 303 304 elif isinstance(obj, micropython.inspect.Class): 305 t.add(obj.get_instantiator().full_name(), obj.get_instantiator().parameters()) 306 307 # Filter out all parameter table entries not referenced by keyword 308 # arguments. 309 310 keyword_names = set() 311 312 for module in self.importer.get_modules(): 313 keyword_names.update(module.keyword_names) 314 315 for function_name, parameters in t.table.items(): 316 for name in parameters.keys(): 317 if name in keyword_names: 318 break 319 else: 320 del t.table[function_name] 321 322 return self.paramtable 323 324 class Importer: 325 326 "An import machine, searching for and loading modules." 327 328 predefined_constants = { 329 "None" : None, 330 "True" : True, 331 "False" : False, 332 #"Ellipsis" : Ellipsis, 333 "NotImplemented" : NotImplemented 334 } 335 336 names_always_used = [ 337 "bool", "__init__", "__call__", "__bool__", "__builtins__", "__main__" 338 ] 339 340 def __init__(self, path=None, verbose=0, optimisations=None): 341 342 """ 343 Initialise the importer with the given search 'path' - a list of 344 directories to search for Python modules. 345 346 The optional 'verbose' parameter causes output concerning the activities 347 of the object to be produced if set to a true value (not the default). 348 349 The optional 'optimisations' cause certain techniques to be used in 350 reducing program size and improving program efficiency. 351 """ 352 353 self.path = path or [os.getcwd()] 354 self.verbose = verbose 355 self.optimisations = optimisations or set() 356 357 self.modules = {} 358 self.modules_ordered = [] 359 self.loading = set() 360 361 # Constant records. 362 363 self.constant_values = {} 364 self.constant_list = None # cache for constants 365 self.init_predefined_constants() 366 367 # Attribute usage. 368 369 self.attributes_used = {} 370 self.name_references = {} 371 self.specific_name_references = {} 372 self.attribute_users_visited = set() 373 374 # Status information. 375 376 self.vacuumed = 0 377 self.finalised = 0 378 379 def get_modules(self): 380 381 "Return all modules known to the importer." 382 383 return self.modules.values() 384 385 def get_module(self, name): 386 387 "Return the module with the given 'name'." 388 389 return self.modules[name] 390 391 # General maintenance. 392 393 def vacuum(self, objtable): 394 395 "Tidy up the modules." 396 397 if self.vacuumed: 398 return 399 400 # Complete the list of attribute names used in the program. 401 402 self.collect_attributes(objtable) 403 404 for name, module in self.modules.items(): 405 if module.loaded: 406 module.vacuum() 407 else: 408 del self.modules[name] 409 410 self.vacuumed = 1 411 412 def finalise(self): 413 414 "Finalise the program (which should have been vacuumed first)." 415 416 if self.finalised: 417 return 418 419 # Reset any previously compiled information. 420 421 for module in self.get_modules(): 422 module.unfinalise() 423 424 # Prepare module information again. 425 426 for module in self.get_modules(): 427 module.finalise() 428 429 self.finalised = 1 430 431 # Name accounting. 432 433 def use_name(self, name, from_name): 434 435 """ 436 Register the given 'name' as being used in the program from within an 437 object with the specified 'from_name'. 438 """ 439 440 if not self.name_references.has_key(from_name): 441 self.name_references[from_name] = set() 442 self.name_references[from_name].add((name,)) 443 444 def use_names(self, names, from_name): 445 446 """ 447 Register the given 'names' as being used in the program from within an 448 object with the specified 'from_name'. 449 """ 450 451 if not self.name_references.has_key(from_name): 452 self.name_references[from_name] = set() 453 self.name_references[from_name].add(names) 454 455 def use_specific_name(self, objname, attrname, from_name): 456 457 """ 458 Register the given 'objname' (for an object) whose 'attrname' is being 459 used in the program from within an object with the specified 460 'from_name'. 461 """ 462 463 if not self.specific_name_references.has_key(from_name): 464 self.specific_name_references[from_name] = set() 465 self.specific_name_references[from_name].add((objname, attrname)) 466 467 # Name accounting products. 468 469 def uses_attribute(self, obj, name): 470 471 """ 472 Return whether the attribute of object 'obj' having the given 'name' is 473 used as an attribute in the program. 474 """ 475 476 return name in self.attributes_used.get(obj.full_name(), []) 477 478 def use_attribute(self, objname, name): 479 480 """ 481 Indicate that in the object with the given 'objname', the attribute of 482 the given 'name' is used. 483 """ 484 485 if not self.attributes_used.has_key(objname): 486 self.attributes_used[objname] = set() 487 self.attributes_used[objname].add(name) 488 489 def collect_attributes(self, objtable): 490 491 "Collect attribute references for the entire program." 492 493 # Start with the "root" modules, finding referenced objects. 494 495 self._collect_attributes("__builtins__", objtable) 496 self._collect_attributes("__main__", objtable) 497 498 # Include names which may not be explicitly used in programs. 499 # NOTE: Potentially declare these when inspecting. 500 501 for name in self.names_always_used: 502 for objname in objtable.all_possible_objects([name]): 503 self.use_attribute(objname, name) 504 505 def _collect_attributes(self, from_name, objtable): 506 507 """ 508 Given an object called 'from_name', find all names referenced from such 509 an object according to the register of names. 510 """ 511 512 if from_name in self.attribute_users_visited: 513 return 514 515 # Get name references and find possible objects which support such 516 # combinations of attribute names. 517 518 for names in self.name_references.get(from_name, []): 519 for objname in objtable.all_possible_objects(names): 520 for name in names: 521 self.use_attribute(objname, name) 522 self._collect_attributes(objname + "." + name, objtable) 523 524 # Get specific name references and visit the referenced objects. 525 526 for objname, attrname in self.specific_name_references.get(from_name, []): 527 self.use_attribute(objname, attrname) 528 self._collect_attributes(objname + "." + attrname, objtable) 529 530 self.attribute_users_visited.add(from_name) 531 532 # Constant accounting. 533 534 def init_predefined_constants(self): 535 536 "Ensure the predefined constants." 537 538 for name, value in self.predefined_constants.items(): 539 self.make_constant(value) 540 541 def get_predefined_constant(self, name): 542 543 "Return the predefined constant for the given 'name'." 544 545 return self.make_constant(self.predefined_constants[name]) 546 547 def get_constant(self, value): 548 549 "Return a constant for the given 'value'." 550 551 const = micropython.data.Const(value) 552 return self.constant_values[const] 553 554 def get_constant_type_name(self, value): 555 return value.__class__.__name__ 556 557 def make_constant(self, value): 558 559 "Make and return a constant for the given 'value'." 560 561 # Ensure the presence of the constant's type. 562 563 name = self.get_constant_type_name(value) 564 if self.modules.has_key("__builtins__"): 565 attr = self.modules["__builtins__"].get(name) 566 567 # Make a constant object and return it. 568 569 const = micropython.data.Const(value) 570 if not self.constant_values.has_key(const): 571 self.constant_values[const] = const 572 return self.constant_values[const] 573 574 def constants(self): 575 576 "Return a list of constants." 577 578 if self.constant_list is None: 579 self.constant_list = list(self.constant_values.values()) 580 581 return self.constant_list 582 583 # Import methods. 584 585 def find_in_path(self, name): 586 587 """ 588 Find the given module 'name' in the search path, returning None where no 589 such module could be found, or a 2-tuple from the 'find' method 590 otherwise. 591 """ 592 593 for d in self.path: 594 m = self.find(d, name) 595 if m: return m 596 return None 597 598 def find(self, d, name): 599 600 """ 601 In the directory 'd', find the given module 'name', where 'name' can 602 either refer to a single file module or to a package. Return None if the 603 'name' cannot be associated with either a file or a package directory, 604 or a 2-tuple from '_find_package' or '_find_module' otherwise. 605 """ 606 607 m = self._find_package(d, name) 608 if m: return m 609 m = self._find_module(d, name) 610 if m: return m 611 return None 612 613 def _find_module(self, d, name): 614 615 """ 616 In the directory 'd', find the given module 'name', returning None where 617 no suitable file exists in the directory, or a 2-tuple consisting of 618 None (indicating that no package directory is involved) and a filename 619 indicating the location of the module. 620 """ 621 622 name_py = name + os.extsep + "py" 623 filename = self._find_file(d, name_py) 624 if filename: 625 return None, filename 626 return None 627 628 def _find_package(self, d, name): 629 630 """ 631 In the directory 'd', find the given package 'name', returning None 632 where no suitable package directory exists, or a 2-tuple consisting of 633 a directory (indicating the location of the package directory itself) 634 and a filename indicating the location of the __init__.py module which 635 declares the package's top-level contents. 636 """ 637 638 filename = self._find_file(d, name) 639 if filename: 640 init_py = "__init__" + os.path.extsep + "py" 641 init_py_filename = self._find_file(filename, init_py) 642 if init_py_filename: 643 return filename, init_py_filename 644 return None 645 646 def _find_file(self, d, filename): 647 648 """ 649 Return the filename obtained when searching the directory 'd' for the 650 given 'filename', or None if no actual file exists for the filename. 651 """ 652 653 filename = os.path.join(d, filename) 654 if os.path.exists(filename): 655 return filename 656 else: 657 return None 658 659 def load(self, name, return_leaf=0): 660 661 """ 662 Load the module or package with the given 'name'. Return an object 663 referencing the loaded module or package, or None if no such module or 664 package exists. 665 """ 666 667 if self.modules.has_key(name) and self.modules[name].loaded: 668 #print "Cached (%s)" % name 669 return self.modules[name] 670 if self.verbose: 671 print "Loading", name 672 673 # Split the name into path components, and try to find the uppermost in 674 # the search path. 675 676 path = name.split(".") 677 m = self.find_in_path(path[0]) 678 if not m: 679 if self.verbose: 680 print "Not found (%s)" % path[0] 681 return None # NOTE: Import error. 682 d, filename = m 683 684 # Either acquire a reference to an already-imported module, or load the 685 # module from a file. 686 687 top = module = self.load_from_file(filename, path[0]) 688 689 # For hierarchical names, traverse each path component... 690 691 if len(path) > 1: 692 if not d: 693 if self.verbose: 694 print "No package (%s)" % filename 695 return None # NOTE: Import error (package not found). 696 else: 697 self.add_submodules(d, module) 698 699 path_so_far = path[:1] 700 for p in path[1:]: 701 path_so_far.append(p) 702 703 # Find the package or module concerned. 704 705 m = self.find(d, p) 706 if not m: 707 if self.verbose: 708 print "Not found (%s)" % p 709 return None # NOTE: Import error. 710 d, filename = m 711 module_name = ".".join(path_so_far) 712 713 # Either reference an imported module or load one from a file. 714 715 submodule = self.load_from_file(filename, module_name) 716 717 if d: 718 self.add_submodules(d, module) 719 720 # Store the submodule within its parent module. 721 722 module.set_module(p, submodule) 723 module = submodule 724 725 # Return either the deepest or the uppermost module. 726 727 if return_leaf: 728 return module 729 else: 730 return top 731 732 def load_from_file(self, name, module_name=None): 733 734 """ 735 Load the module with the given 'name' (which may be a full module path). 736 """ 737 738 if module_name is None: 739 module_name = "__main__" 740 741 module = self.add_module(module_name) 742 if not module.loaded and module not in self.loading: 743 self.loading.add(module) 744 #print "Parsing", name 745 module.parse(name) 746 #print "Done", name 747 self.loading.remove(module) 748 module.loaded = 1 749 750 # Record the module. 751 752 #print "Loaded", module_name, "with namespace", module.namespace.keys() 753 return module 754 755 def add_module(self, module_name): 756 757 """ 758 Return the module with the given 'module_name', adding a new module 759 object if one does not already exist. 760 """ 761 762 if not self.modules.has_key(module_name): 763 self.modules[module_name] = module = micropython.inspect.InspectedModule(module_name, self) 764 self.modules_ordered.append(module) 765 else: 766 module = self.modules[module_name] 767 return module 768 769 def add_submodules(self, pathname, module): 770 771 """ 772 Work around insufficient __all__ declarations and examine the directory 773 with the given 'pathname', adding submodules to the given 'module'. 774 """ 775 776 for filename in os.listdir(pathname): 777 submodule, ext = os.path.splitext(filename) 778 if ext not in ("", ".py"): 779 continue 780 module.set_module(submodule, self.add_module(module.name + "." + submodule)) 781 782 # vim: tabstop=4 expandtab shiftwidth=4