1 #!/usr/bin/env python 2 3 """ 4 A really simple virtual processor employing a simple set of instructions which 5 ignore low-level operations and merely concentrate on variable access, structure 6 access, structure allocation and function invocations. 7 8 Copyright (C) 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 The execution model of the virtual processor involves the following things: 26 27 * Memory contains constants, global variable 28 references and program code 29 30 * PC (program counter) stack contains the return address associated 31 with each function invocation 32 33 * Frame stack contains invocation frames in use and in 34 preparation plus temporary storage 35 36 * Local frame pointer stack refers to the frames in the frame stack 37 38 * Invocation frame pointer stack 39 40 * Exception handler stack 41 42 * Exception handler locals stack refers to the state of the local frame 43 pointer stack 44 45 * Exception handler PC stack refers to the state of the PC stack 46 47 * Registers: current value, 48 boolean status value, 49 source value, 50 current result, 51 current exception, 52 current callable 53 """ 54 55 from micropython.program import DataObject # for creating "nice" new objects 56 57 class IllegalInstruction(Exception): 58 pass 59 60 class IllegalAddress(Exception): 61 def __init__(self, address): 62 self.address = address 63 def __repr__(self): 64 return "IllegalAddress(%r)" % self.address 65 def __str__(self): 66 return repr(self) 67 68 class EmptyPCStack(Exception): 69 pass 70 71 class EmptyFrameStack(Exception): 72 pass 73 74 class BreakpointReached(Exception): 75 pass 76 77 class RSVPMachine: 78 79 "A really simple virtual processor." 80 81 def __init__(self, memory, objlist, paramlist, true_constant, false_constant, pc=None, debug=0): 82 83 """ 84 Initialise the processor with a 'memory' (a list of values containing 85 instructions and data), the object and parameter lists 'objlist' and 86 'paramlist', the addresses 'true_constant' and 'false_constant', and the 87 optional program counter 'pc'. 88 """ 89 90 self.memory = memory 91 self._objlist = objlist 92 self._paramlist = paramlist 93 self.objlist = objlist.as_raw() 94 self.paramlist = paramlist.as_raw() 95 self.true_constant = true_constant 96 self.false_constant = false_constant 97 98 self.pc = pc or 0 99 self.debug = debug 100 101 # Stacks. 102 103 self.pc_stack = [] 104 self.frame_stack = [] 105 self.local_sp_stack = [0] 106 self.invocation_sp_stack = [] 107 self.handler_stack = [len(self.memory) - 1] # final handler is the end of the code 108 self.handler_local_sp_stack = [] 109 self.handler_pc_stack = [] 110 111 # Registers. 112 113 self.instruction = None 114 self.operand = None 115 self.value = None 116 self.status = None 117 self.source = None 118 self.callable = None 119 self.result = None 120 self.exception = None 121 122 # Constants. 123 124 cls = self._get_class("__builtins__", "AttributeError") 125 self.attr_error = cls.location 126 self.attr_error_instance = cls.instance_template_location 127 cls = self._get_class("__builtins__", "TypeError") 128 self.type_error = cls.location 129 self.type_error_instance = cls.instance_template_location 130 cls = self._get_class("__builtins__", "IndexError") 131 self.index_error = cls.location 132 self.index_error_instance = cls.instance_template_location 133 134 # Native class constants. 135 136 cls = self._get_class("__builtins__", "int") 137 self.int_class = cls.location 138 self.int_instance = cls.instance_template_location 139 cls = self._get_class("__builtins__", "list") 140 self.list_instance = cls.instance_template_location 141 142 # Debugging attributes. 143 144 self.breakpoints = set() 145 146 def _get_class(self, module, name): 147 return self._objlist.access(module, name).get_value() 148 149 # Debugging methods. 150 151 def dump(self): 152 print "PC", self.pc, "->", self.load(self.pc) 153 print "PC stack", self.pc_stack 154 print "Frame stack", self.frame_stack 155 print "Local stack pointers", self.local_sp_stack 156 print "Invocation stack pointers", self.invocation_sp_stack 157 print "Handler stack", self.handler_stack 158 print "Handler frame stack", self.handler_local_sp_stack 159 print "Handler PC stack", self.handler_pc_stack 160 print 161 print "Instruction", self.instruction 162 print "Operand", self.operand 163 print "Value", self.value 164 print "Status", self.status 165 print "Source", self.source 166 print "Callable", self.callable 167 print "Result", self.result 168 print "Exception", self.exception 169 170 def show(self): 171 self.show_memory(self.memory, 0) 172 173 def show_pc(self, run_in=10): 174 start = max(0, self.pc - run_in) 175 end = self.pc + run_in 176 memory = self.memory[start:end] 177 self.show_memory(memory, start) 178 179 def show_memory(self, memory, start): 180 for i, x in enumerate(memory): 181 location = start + i 182 if location == self.pc: 183 print "->", 184 else: 185 print " ", 186 print "%5d %r" % (location, x) 187 188 def step(self, dump=0): 189 self.execute() 190 self.show_pc() 191 if dump: 192 self.dump() 193 194 def set_break(self, location): 195 self.breakpoints.add(location) 196 197 # Internal operations. 198 199 def load(self, address): 200 201 "Return the value at the given 'address'." 202 203 try: 204 return self.memory[address] 205 except IndexError: 206 raise IllegalAddress(address) 207 except TypeError: 208 raise IllegalAddress(address) 209 210 def save(self, address, value): 211 212 "Save to the given 'address' the specified 'value'." 213 214 try: 215 self.memory[address] = value 216 except IndexError: 217 raise IllegalAddress(address) 218 except TypeError: 219 raise IllegalAddress(address) 220 221 def new(self, size): 222 223 """ 224 Allocate space of the given 'size', returning the address of the space. 225 """ 226 227 addr = len(self.memory) 228 for i in range(0, size): 229 self.memory.append(None) 230 return addr 231 232 def push_pc(self, data): 233 234 "Push 'data' onto the PC stack." 235 236 self.pc_stack.append(data) 237 238 def pull_pc(self): 239 240 "Pull a value from the PC stack and return it." 241 242 try: 243 return self.pc_stack.pop() 244 except IndexError: 245 raise EmptyPCStack 246 247 def run(self): 248 249 "Execute code in the memory, starting from the current PC address." 250 251 try: 252 while 1: 253 self.execute() 254 except EmptyPCStack: 255 pass 256 257 print "Execution terminated", 258 if self.exception is not None: 259 ref = self.exception 260 addr = self.load(ref + 1) 261 print "with exception:", self.load(ref) 262 print "At address %d: %r" % (addr, self.load(addr)) 263 else: 264 print "successfully." 265 266 def execute(self): 267 268 "Execute code in the memory at the current PC address." 269 270 if self.pc in self.breakpoints: 271 self.breakpoints.remove(self.pc) 272 raise BreakpointReached 273 274 self.instruction = self.load(self.pc) 275 276 # Process any inputs of the instruction. 277 278 self.process_inputs() 279 280 # Perform the instruction itself. 281 282 next_pc = self.perform(self.instruction) 283 284 # Update the program counter. 285 286 if next_pc is None: 287 self.pc += 1 288 else: 289 self.pc = next_pc 290 291 def get_method(self, instruction): 292 293 "Return the handler method for the given 'instruction'." 294 295 instruction_name = instruction.__class__.__name__ 296 if self.debug: 297 print "%8d %s" % (self.pc, instruction_name) 298 method = getattr(self, instruction_name, None) 299 if method is None: 300 raise IllegalInstruction, (self.pc, instruction_name) 301 return method 302 303 def perform(self, instruction): 304 305 "Perform the 'instruction', returning the next PC value or None." 306 307 self.operand = instruction.get_operand() 308 method = self.get_method(instruction) 309 return method() 310 311 def process_inputs(self): 312 313 """ 314 Process any inputs of the current instruction. This permits any directly 315 connected sub-instructions to produce the effects that separate 316 instructions would otherwise have. 317 """ 318 319 value = self.value 320 if self.instruction.source is not None: 321 self.perform(self.instruction.source) 322 self.source = self.value 323 self.value = value 324 if self.instruction.input is not None: 325 self.perform(self.instruction.input) 326 327 def jump(self, addr, next): 328 329 """ 330 Jump to the subroutine at (or identified by) 'addr'. If 'addr' 331 identifies a library function then invoke the library function and set 332 PC to 'next' afterwards; otherwise, set PC to 'addr'. 333 """ 334 335 # Trap library functions introduced through the use of strings instead 336 # of proper locations. 337 338 if isinstance(addr, str): 339 handler = self.native_functions[addr](self) 340 if handler is None: 341 return next 342 else: 343 return handler 344 else: 345 self.push_pc(self.pc + 1) 346 return addr 347 348 # Instructions. 349 350 def LoadConst(self): 351 self.value = self.operand, self.operand 352 353 def LoadFunction(self): 354 self.value = None, self.operand # context of constant is not interesting 355 356 def LoadName(self): 357 frame = self.local_sp_stack[-1] 358 self.value = self.frame_stack[frame + self.operand] 359 360 def StoreName(self): 361 frame = self.local_sp_stack[-1] 362 self.frame_stack[frame + self.operand] = self.source 363 364 LoadTemp = LoadName 365 366 def StoreTemp(self): 367 frame = self.local_sp_stack[-1] 368 self.frame_stack[frame + self.operand] = self.value 369 370 def LoadAddress(self): 371 # Preserve context (potentially null). 372 self.value = self.load(self.operand) 373 374 def LoadAddressContext(self): 375 context, ref = self.load(self.operand) 376 inst_context, inst_ref = self.value 377 self.value = inst_ref, ref 378 379 def LoadAddressContextCond(self): 380 context, ref = self.load(self.operand) 381 inst_context, inst_ref = self.value 382 self.value = self._LoadAddressContextCond(context, ref, inst_ref) 383 384 def StoreAddress(self): 385 # Preserve context. 386 self.save(self.operand, self.source) 387 388 def StoreAddressContext(self): 389 # Overwrite context if null. 390 context_context, context_ref = self.value 391 source_context, source_ref = self.source 392 if source_context is None: 393 context = context_ref 394 else: 395 context = source_context 396 self.save(self.operand, (context, source_ref)) 397 398 def MakeObject(self): 399 size = self.operand 400 context, ref = self.value 401 # NOTE: Referencing the instance template. 402 addr = self._MakeObject(size, ref - 1) 403 # Introduce object as context for the new object. 404 self.value = addr, addr 405 406 def LoadAttr(self): 407 context, ref = self.value 408 # Retrieved context should already be appropriate for the instance. 409 # NOTE: Adding 1 to skip any header. 410 self.value = self.load(ref + self.operand + 1) 411 412 def StoreAttr(self): 413 context, ref = self.value 414 # Target should already be an instance. 415 # NOTE: Adding 1 to skip any header. 416 self.save(ref + self.operand + 1, self.source) 417 418 def LoadAttrIndex(self): 419 context, ref = self.value 420 data = self.load(ref) 421 element = self.objlist[data.classcode + self.operand] 422 attr_index, class_attr, offset = element 423 if attr_index == self.operand: 424 if class_attr: 425 self.value = self.load(offset) # offset is address of class attribute 426 else: 427 self.value = self.load(ref + offset) 428 else: 429 self.exception = self._MakeObject(2, self.attr_error_instance) 430 return self.RaiseException() 431 432 def LoadAttrIndexContext(self): 433 context, ref = self.value 434 data = self.load(ref) 435 element = self.objlist[data.classcode + self.operand] 436 attr_index, class_attr, offset = element 437 if attr_index == self.operand: 438 loaded_context, loaded_ref = self.load(offset) # offset is address of class attribute 439 self.value = ref, loaded_ref 440 else: 441 self.exception = self._MakeObject(2, self.attr_error_instance) 442 return self.RaiseException() 443 444 def LoadAttrIndexContextCond(self): 445 context, ref = self.value 446 data = self.load(ref) 447 element = self.objlist[data.classcode + self.operand] 448 attr_index, class_attr, offset = element 449 if attr_index == self.operand: 450 if class_attr: 451 loaded_context, loaded_ref = self.load(offset) # offset is address of class attribute 452 if data.attrcode is None: # absent attrcode == class 453 self.value = loaded_context, loaded_ref 454 else: 455 self.value = self._LoadAddressContextCond(loaded_context, loaded_ref, ref) 456 else: 457 self.value = self.load(ref + offset) 458 else: 459 self.exception = self._MakeObject(2, self.attr_error_instance) 460 return self.RaiseException() 461 462 def StoreAttrIndex(self): 463 context, ref = self.value 464 data = self.load(ref) 465 element = self.objlist[data.classcode + self.operand] 466 attr_index, class_attr, offset = element 467 if attr_index == self.operand: 468 if class_attr: 469 self.exception = self._MakeObject(2, self.type_error_instance) 470 return self.RaiseException() 471 else: 472 self.save(ref + offset, self.source) 473 else: 474 self.exception = self._MakeObject(2, self.attr_error_instance) 475 return self.RaiseException() 476 477 # NOTE: LoadAttrIndexContext is a possibility if a particular attribute can always be overridden. 478 479 def MakeFrame(self): 480 self.invocation_sp_stack.append(len(self.frame_stack)) 481 self.frame_stack.extend([None] * self.operand) 482 483 def DropFrame(self): 484 self.local_sp_stack.pop() 485 frame = self.invocation_sp_stack.pop() 486 self.frame_stack = self.frame_stack[:frame] # reset stack before call 487 488 def RecoverFrame(self): 489 self.local_sp_stack.pop() 490 491 def StoreFrame(self): 492 frame = self.invocation_sp_stack[-1] # different from the current frame after MakeFrame 493 self.frame_stack[frame + self.operand] = self.value 494 495 def StoreFrameIndex(self): 496 context, ref = self.value 497 frame = self.invocation_sp_stack[-1] # different from the current frame after MakeFrame 498 data = self.load(ref) 499 element = self.paramlist[data.funccode + self.operand] 500 # NOTE: Need to ensure correct positioning where a context has been generated. 501 param_index, offset = element 502 if param_index == self.operand: 503 self.frame_stack[frame + offset + 1] = self.source # add 1 to skip the context always generated 504 else: 505 self.exception = self._MakeObject(2, self.type_error_instance) 506 return self.RaiseException() 507 508 def LoadCallable(self): 509 context, ref = self.value 510 data = self.load(ref) 511 self.callable = data.codeaddr 512 513 def StoreCallable(self): 514 context, ref = self.value 515 # NOTE: Should improve the representation and permit direct saving. 516 data = self.load(ref) 517 self.save(ref, (data.classcode, data.attrcode) + self.callable) 518 519 def LoadContext(self): 520 context, ref = self.value 521 # NOTE: Omission of the context of the context would make things like 522 # NOTE: self() inside methods impossible. 523 self.value = context, context 524 525 def CheckContext(self): 526 self.status = self.value[1] is not None 527 528 def CheckClassContext(self): 529 context_context, context_ref = self.value 530 context_data = self.load(context_ref) 531 532 # Classes are not themselves usable as the self argument. 533 # NOTE: This may change at some point. 534 # However, where classes appear as the context, instance 535 # compatibility is required in the first argument. 536 537 self.status = context_data.attrcode is None # absent attrcode == class 538 539 def CheckFrame(self): 540 (nargs, ndefaults, has_star) = self.operand 541 542 # The frame is actually installed as the locals. 543 # Retrieve the context from the first local. 544 545 frame = self.local_sp_stack[-1] 546 nlocals = len(self.frame_stack[frame:]) 547 548 if not ((nargs - ndefaults) <= nlocals and (nlocals <= nargs or has_star)): 549 #raise Exception, "CheckFrame %r (%r <= %r <= %r)" % (self.operand, nargs - ndefaults, nlocals, nargs) 550 self.exception = self._MakeObject(2, self.type_error_instance) 551 return self.RaiseException() 552 553 def FillDefaults(self): 554 # NOTE: Make the get_operand method of the instruction provide the 555 # NOTE: function location. 556 (nargs, ndefaults, fn) = self.operand 557 558 # The frame is actually installed as the locals. 559 560 frame = self.local_sp_stack[-1] 561 nlocals = len(self.frame_stack[frame:]) 562 563 # Support population of defaults. 564 # This involves copying the "attributes" of a function into the frame. 565 566 default = nlocals - (nargs - ndefaults) 567 self.frame_stack.extend([None] * (nargs - nlocals)) 568 pos = nlocals 569 ref = fn.location 570 571 while pos < nargs: 572 self.frame_stack[frame + pos] = self.load(ref + default + 1) # skip header 573 default += 1 574 pos += 1 575 576 def CheckSelf(self): 577 context, ref = self.value 578 target_context, target_ref = self.source 579 580 # Check the details of the proposed context and the target's context. 581 582 self.status = self._CheckInstance(ref, target_context) 583 584 def JumpWithFrame(self): 585 codeaddr = self.callable 586 self.local_sp_stack.append(self.invocation_sp_stack[-1]) # adopt the invocation frame 587 return self.jump(codeaddr, self.pc + 1) # return to the instruction after this one 588 589 def JumpWithFrameDirect(self): 590 operand = self.operand 591 self.local_sp_stack.append(self.invocation_sp_stack[-1]) # adopt the invocation frame 592 return self.jump(operand, self.pc + 1) # return to the instruction after this one 593 594 def ExtendFrame(self): 595 self.frame_stack.extend([None] * self.operand) 596 597 def AdjustFrame(self): 598 self.invocation_sp_stack[-1] += self.operand 599 600 def Return(self): 601 return self.pull_pc() 602 603 def LoadResult(self): 604 self.value = self.result 605 606 def StoreResult(self): 607 self.result = self.value 608 609 def Jump(self): 610 return self.operand 611 612 def JumpIfTrue(self): 613 if self.status: 614 return self.operand 615 616 def JumpIfFalse(self): 617 if not self.status: 618 return self.operand 619 620 def LoadException(self): 621 self.value = self.exception, self.exception 622 623 def StoreException(self): 624 self.exception = self.value[1] 625 626 def RaiseException(self): 627 # NOTE: Adding the program counter as the first attribute. 628 self.save(self.exception + 1, self.pc) 629 # Jumping to the current handler. 630 return self.handler_stack[-1] 631 632 def PushHandler(self): 633 self.handler_stack.append(self.operand) 634 self.handler_local_sp_stack.append(len(self.local_sp_stack)) 635 self.handler_pc_stack.append(len(self.pc_stack)) 636 637 def PopHandler(self): 638 # Reduce the local frame pointer stack to refer to the handler's frame. 639 self.local_sp_stack = self.local_sp_stack[:self.handler_local_sp_stack.pop()] 640 # Reduce the PC stack to discard all superfluous return addresses. 641 self.pc_stack = self.pc_stack[:self.handler_pc_stack.pop()] 642 self.handler_stack.pop() 643 644 def CheckException(self): 645 self.status = self.exception is not None and self._CheckInstance(self.exception, self.value[1]) 646 647 def TestIdentity(self): 648 self.status = self.value[1] == self.source[1] 649 650 def TestIdentityAddress(self): 651 self.status = self.value[1] == self.operand 652 653 # LoadBoolean is implemented in the generated code. 654 # StoreBoolean is implemented by testing against the True value. 655 656 def InvertBoolean(self): 657 self.status = not self.status 658 659 # Common implementation details. 660 661 def _CheckInstance(self, ref, cls): 662 data = self.load(ref) 663 target_data = self.load(cls) 664 665 # Insist on instance vs. class. 666 667 if data.attrcode is None: # absent attrcode == class 668 return 0 669 670 if target_data.attrcode is not None: # present attrcode == instance 671 return 0 672 673 # Find the table entry for the descendant. 674 675 element = self.objlist[target_data.classcode + data.attrcode] 676 if element is not None: 677 attr_index, class_attr, offset = element 678 return attr_index == data.attrcode 679 else: 680 return 0 681 682 def _MakeObject(self, size, ref): 683 # Load the template. 684 data = self.load(ref) 685 addr = self.new(size) 686 # Save the header, overriding the size. 687 self.save(addr, data.with_size(size)) 688 return addr 689 690 def _LoadAddressContextCond(self, context, ref, inst_ref): 691 692 # Check the instance context against the target's context. 693 694 if self._CheckInstance(inst_ref, context): 695 # Replace the context with the instance. 696 return inst_ref, ref 697 else: 698 return context, ref 699 700 # Native function implementations. 701 702 def builtins_int_add(self): 703 frame = self.local_sp_stack[-1] 704 705 # Get operands addresses. 706 707 left_context, left = self.frame_stack[frame] 708 right_context, right = self.frame_stack[frame + 1] 709 710 # Test operand suitability. 711 712 if not self._CheckInstance(left, self.int_class) and self._CheckInstance(right, self.int_class): 713 self.exception = self._MakeObject(2, self.type_error_instance) 714 return self.RaiseException() 715 716 # NOTE: Assume single location for data. 717 718 left_data = left + 1 719 right_data = right + 1 720 721 # Make a new object. 722 723 addr = self._MakeObject(2, self.int_instance) 724 725 # Store the result. 726 # NOTE: The data is considered ready to use. 727 728 self.save(addr + 1, self.load(left_data) + self.load(right_data)) 729 730 # Return the new object. 731 # Introduce object as context for the new object. 732 733 self.result = addr, addr 734 735 def builtins_int_bool(self): 736 frame = self.local_sp_stack[-1] 737 738 # Get operands addresses. 739 740 left_context, left = self.frame_stack[frame] 741 742 # Test operand suitability. 743 744 if not self._CheckInstance(left, self.int_class): 745 self.exception = self._MakeObject(2, self.type_error_instance) 746 return self.RaiseException() 747 748 # NOTE: Assume single location for data. 749 750 left_data = left + 1 751 752 # Test the data. 753 # NOTE: The data is considered ready to use. 754 755 if self.load(left_data) != 0: 756 self.result = self.true_constant, self.true_constant 757 else: 758 self.result = self.false_constant, self.false_constant 759 760 def builtins_int_neg(self): 761 frame = self.local_sp_stack[-1] 762 763 # Get operands addresses. 764 765 left_context, left = self.frame_stack[frame] 766 767 # Test operand suitability. 768 769 if not self._CheckInstance(left, self.int_class): 770 self.exception = self._MakeObject(2, self.type_error_instance) 771 return self.RaiseException() 772 773 # NOTE: Assume single location for data. 774 775 left_data = left + 1 776 777 # Make a new object. 778 779 addr = self._MakeObject(2, self.int_instance) 780 781 # Store the result. 782 # NOTE: The data is considered ready to use. 783 784 self.save(addr + 1, -self.load(left_data)) 785 786 # Return the new object. 787 # Introduce object as context for the new object. 788 789 self.result = addr, addr 790 791 def builtins_bool_bool(self): 792 frame = self.local_sp_stack[-1] 793 794 # Get operands addresses. 795 796 left_context, left = self.frame_stack[frame] 797 self.result = left, left 798 799 def builtins_list_new(self): 800 frame = self.local_sp_stack[-1] 801 802 # NOTE: Specific copying of tuples/lists. 803 804 args_context, args = self.frame_stack[frame] 805 header = self.load(args) 806 807 list = self._MakeObject(header.size, self.list_instance) 808 for i in range(1, header.size): 809 self.save(list + i, self.load(args + i)) 810 811 self.result = list, list 812 813 def builtins_list_getitem(self): 814 frame = self.local_sp_stack[-1] 815 816 # Get operands addresses. 817 818 obj_context, obj = self.frame_stack[frame] 819 item_context, item = self.frame_stack[frame + 1] 820 821 header = self.load(obj) 822 nelements = header.size - 1 823 824 # NOTE: Assume single location for data. 825 826 item_pos = self.load(item + 1) 827 if item_pos >= 0 and item_pos < nelements: 828 pass 829 elif item_pos < 0 and item_pos >= -nelements: 830 item_pos = nelements + item_pos 831 else: 832 self.exception = self._MakeObject(2, self.index_error_instance) 833 return self.RaiseException() 834 835 self.result = self.load(obj + 1 + item_pos) 836 837 def builtins_object_init(self): 838 pass 839 840 native_functions = { 841 "__builtins__.int.__add__" : builtins_int_add, 842 "__builtins__.int.__bool__" : builtins_int_bool, 843 "__builtins__.int.__neg__" : builtins_int_neg, 844 "__builtins__.bool.__bool__" : builtins_bool_bool, 845 "__builtins__.list" : builtins_list_new, 846 "__builtins__.list.__getitem__" : builtins_list_getitem, 847 "__builtins__.object.__init__" : builtins_object_init, 848 } 849 850 # vim: tabstop=4 expandtab shiftwidth=4