universe.py 21.4 KB
Newer Older
1 2
from __future__ import print_function

3
from som.interpreter.interpreter import Interpreter
Stefan Marr's avatar
Stefan Marr committed
4
from som.interpreter.bytecodes   import Bytecodes 
5 6
from som.vm.symbol_table         import SymbolTable
from som.vmobjects.object        import Object
7 8 9
from som.vmobjects.clazz         import Class
from som.vmobjects.array         import Array
from som.vmobjects.symbol        import Symbol
10
from som.vmobjects.method        import Method
Stefan Marr's avatar
Stefan Marr committed
11
from som.vmobjects.integer       import Integer
12 13 14 15 16
from som.vmobjects.string        import String
from som.vmobjects.block         import Block
from som.vmobjects.frame         import Frame
from som.vmobjects.big_integer   import BigInteger
from som.vmobjects.double        import Double
17

18 19
import som.compiler.sourcecode_compiler as sourcecode_compiler

20
import os
21
import sys
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

class Universe(object):
    
    def __init__(self):
        self._interpreter    = Interpreter(self)
        self._symbol_table   = SymbolTable()
        
        self._globals        = {}
        
        self._nilObject      = None
        self._trueObject     = None
        self._falseObject    = None
        self._objectClass    = None
        self._classClass     = None
        self._metaclassClass = None
        
        self._nilClass       = None
        self._integerClass   = None
        self._bigintegerClass= None
        self._arrayClass     = None
        self._methodClass    = None
        self._symbolClass    = None
        self._frameClass     = None
        self._primitiveClass = None
        self._systemClass    = None
        self._blockClass     = None
        self._doubleClass    = None
        
        self._last_exit_code = 0
        self._classpath      = None
        self._dump_bytecodes = False        
53 54 55 56
    
    @property
    def nilObject(self):
        return self._nilObject
Stefan Marr's avatar
Stefan Marr committed
57
    
58 59 60 61 62 63 64 65
    @property
    def trueObject(self):
        return self._trueObject
    
    @property
    def falseObject(self):
        return self._falseObject
    
Stefan Marr's avatar
Stefan Marr committed
66 67 68
    @property
    def primitiveClass(self):
        return self._primitiveClass
69 70 71 72
    
    @property
    def metaclassClass(self):
        return self._metaclassClass
73 74 75 76 77 78 79 80 81 82 83
    
    def execute_method(self, class_name, selector):
        self._initialize_object_system()

        clazz = self.load_class(self.symbol_for(class_name))

        # Lookup the invokable on class
        invokable = clazz.get_class().lookup_invokable(self.symbol_for(selector))

        bootstrap_method = self._create_bootstrap_method()
        bootstrap_frame  = self._create_bootstrap_frame(bootstrap_method, clazz)
84
        
85
        return self.start(bootstrap_frame, invokable)
86
    
87 88 89 90 91 92 93 94
    def _create_bootstrap_method(self):
        # Create a fake bootstrap method to simplify later frame traversal
        bootstrap_method = self.new_method(self.symbol_for("bootstrap"), 1, 0)
        bootstrap_method.set_bytecode(0, Bytecodes.halt)
        bootstrap_method.set_number_of_locals(self.new_integer(0))
        bootstrap_method.set_maximum_number_of_stack_elements(self.new_integer(2))
        bootstrap_method.set_holder(self._systemClass)
    
95 96 97 98 99 100 101 102 103 104 105
    def _create_bootstrap_frame(self, bootstrap_method, receiver, arguments = None):
        # Create a fake bootstrap frame with the system object on the stack
        bootstrap_frame = self._interpreter.push_new_frame(bootstrap_method)
        bootstrap_frame.push(receiver)
        
        if arguments:
            # Convert the arguments into an array
            arguments_array = self.new_array_from_list(arguments)
            bootstrap_frame.push(arguments_array)
        
    
106 107
    def interpret(self, arguments):
        # Check for command line switches
108
        arguments = self.handle_arguments(arguments)
109 110

        # Initialize the known universe
111 112
        system_object = self._initialize_object_system()
        bootstrap_method = self._create_bootstrap_method()
113
        
114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132
        # Start the shell if no filename is given
        if len(arguments) == 0:
            shell = Shell(self, self._interpreter)
            shell.set_bootstrap_method(bootstrap_method)
            shell.start()
            return
        else:
            bootstrap_frame = self._create_bootstrap_frame(bootstrap_method, system_object, arguments)
            # Lookup the initialize invokable on the system class
            initialize = self._systemClass.lookup_invokable(self.symbol_for("initialize:"))

            self.start(bootstrap_frame, initialize)
    
    def start(self, bootstrap_frame, invokable):
        # Invoke the initialize invokable
        invokable.invoke(bootstrap_frame, self._interpreter)

        # Start the interpreter
        return self._interpreter.start()
133
    
134
    def handle_arguments(self, arguments):
135 136 137 138 139 140 141 142
        got_classpath  = False
        remaining_args = []

        i = 0
        while i < len(arguments):
            if arguments[i] == "-cp":
                if i + 1 >= len(arguments):
                    self._print_usage_and_exit()
143
                self.setup_classpath(arguments[i + 1])
144 145 146 147 148 149 150 151 152 153
                i += 1    # skip class path
                got_classpath = True
            elif arguments[i] == "-d":
                self._dump_bytecodes = True
            else:
                remaining_args.append(arguments[i])
            i += 1 
    
        if not got_classpath:
            # Get the default class path of the appropriate size
154
            self._classpath = self._setup_default_classpath()
155 156 157 158 159 160 161 162 163 164 165 166 167 168

        # check remaining args for class paths, and strip file extension
        i = 0
        while i < len(remaining_args):
            split = self._get_path_class_ext(remaining_args[i])

            if split[0] != "":  # there was a path
                self._classpath.insert(0, split[0])
        
            remaining_args[i] = split[1]
            i += 1
        
        return remaining_args
    
169
    def setup_classpath(self, cp):
170 171
        self._classpath = cp.split(os.pathsep)
    
172 173 174
    def _setup_default_classpath(self):
        return ['.']
    
175 176 177 178 179 180 181
    # take argument of the form "../foo/Test.som" and return
    # "../foo", "Test", "som"
    def _get_path_class_ext(self, path):
        (path, file_name) = os.path.split(path)
        (file_name, ext)  = os.path.splitext(file_name)
        return (path, file_name, ext[1:])

182
    def _initialize_object_system(self):
183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203
        # Allocate the nil object
        self._nilObject = Object(None)

        # Allocate the Metaclass classes
        self._metaclassClass = self.new_metaclass_class()

        # Allocate the rest of the system classes
        self._objectClass     = self.new_system_class()
        self._nilClass        = self.new_system_class()
        self._classClass      = self.new_system_class()
        self._arrayClass      = self.new_system_class()
        self._symbolClass     = self.new_system_class()
        self._methodClass     = self.new_system_class()
        self._integerClass    = self.new_system_class()
        self._bigintegerClass = self.new_system_class()
        self._frameClass      = self.new_system_class()
        self._primitiveClass  = self.new_system_class()
        self._stringClass     = self.new_system_class()
        self._doubleClass     = self.new_system_class()

        # Setup the class reference for the nil object
204
        self._nilObject.set_class(self._nilClass)
205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236

        # Initialize the system classes
        self._initialize_system_class(self._objectClass,                  None, "Object")
        self._initialize_system_class(self._classClass,      self._objectClass, "Class")
        self._initialize_system_class(self._metaclassClass,   self._classClass, "Metaclass")
        self._initialize_system_class(self._nilClass,        self._objectClass, "Nil")
        self._initialize_system_class(self._arrayClass,      self._objectClass, "Array")
        self._initialize_system_class(self._methodClass,      self._arrayClass, "Method")
        self._initialize_system_class(self._symbolClass,     self._objectClass, "Symbol")
        self._initialize_system_class(self._integerClass,    self._objectClass, "Integer")
        self._initialize_system_class(self._bigintegerClass, self._objectClass, "BigInteger")
        self._initialize_system_class(self._frameClass,       self._arrayClass, "Frame")
        self._initialize_system_class(self._primitiveClass,  self._objectClass, "Primitive")
        self._initialize_system_class(self._stringClass,     self._objectClass, "String")
        self._initialize_system_class(self._doubleClass,     self._objectClass, "Double")

        # Load methods and fields into the system classes
        self._load_system_class(self._objectClass)
        self._load_system_class(self._classClass)
        self._load_system_class(self._metaclassClass)
        self._load_system_class(self._nilClass)
        self._load_system_class(self._arrayClass)
        self._load_system_class(self._methodClass)
        self._load_system_class(self._symbolClass)
        self._load_system_class(self._integerClass)
        self._load_system_class(self._bigintegerClass)
        self._load_system_class(self._frameClass)
        self._load_system_class(self._primitiveClass)
        self._load_system_class(self._stringClass)
        self._load_system_class(self._doubleClass)

        # Load the generic block class
Stefan Marr's avatar
Stefan Marr committed
237
        self._blockClass = self.load_class(self.symbol_for("Block"))
238 239

        # Setup the true and false objects
Stefan Marr's avatar
Stefan Marr committed
240 241
        self._trueObject  = self.new_instance(self.load_class(self.symbol_for("True")))
        self._falseObject = self.new_instance(self.load_class(self.symbol_for("False")))
242 243

        # Load the system class and create an instance of it
Stefan Marr's avatar
Stefan Marr committed
244
        self._systemClass = self.load_class(self.symbol_for("System"))
Stefan Marr's avatar
Stefan Marr committed
245
        system_object = self.new_instance(self._systemClass)
246 247

        # Put special objects and classes into the dictionary of globals
248 249 250
        self.set_global(self.symbol_for("nil"),    self._nilObject)
        self.set_global(self.symbol_for("true"),   self._trueObject)
        self.set_global(self.symbol_for("false"),  self._falseObject)
251
        self.set_global(self.symbol_for("system"), system_object)
252 253
        self.set_global(self.symbol_for("System"), self._systemClass)
        self.set_global(self.symbol_for("Block"),  self._blockClass)
254 255
        return system_object
    
256 257 258 259 260 261 262 263 264
    def symbol_for(self, string):
        # Lookup the symbol in the symbol table
        result = self._symbol_table.lookup(string)
        if result:
            return result
        
        # Create a new symbol and return it
        result = self.new_symbol(string)
        return result
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
    
    def new_array_with_length(self, length):
        # Allocate a new array and set its class to be the array class
        result = Array(self._nilObject)
        result.set_class(self._arrayClass)

        # Set the number of indexable fields to the given value (length)
        result.set_number_of_indexable_fields_and_clear(length, self._nilObject)

        # Return the freshly allocated array
        return result
  
    def new_array_from_list(self, values):
        # Allocate a new array with the same length as the list
        result = self.new_array_with_length(len(values))

        # Copy all elements from the list into the array
        for i in range(len(values)):
            result.set_indexable_field(i, values[i])
    
        # Return the allocated and initialized array
        return result
  
    def new_array_with_strings(self, strings):
        # Allocate a new array with the same length as the string array
        result = self.new_array_with_length(len(strings))

        # Copy all elements from the string array into the array
        for i in range(len(strings)):
            result.set_indexable_field(i, self.new_string(strings[i]))
    
        # Return the allocated and initialized array
        return result
298
    
299 300 301 302 303 304 305 306 307 308 309 310 311 312
    def new_block(self, method, context_frame, arguments):
        # Allocate a new block and set its class to be the block class
        result = Block(self._nilObject)
        result.set_class(self._get_block_class(arguments))

        # Set the method and context of block
        result.set_method(method)
        result.set_context(context_frame)

        # Return the freshly allocated block
        return result

    def new_class(self, class_class):
        # Allocate a new class and set its class to be the given class class
Stefan Marr's avatar
Stefan Marr committed
313
        result = Class(self, class_class.get_number_of_instance_fields())
314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
        result.set_class(class_class)

        # Return the freshly allocated class
        return result

    def new_frame(self, previous_frame, method):
        # Allocate a new frame and set its class to be the frame class
        result = Frame(self._nilObject)
        result.set_class(self._frameClass)

        # Compute the maximum number of stack locations (including arguments,
        # locals and extra buffer to support doesNotUnderstand) and set the
        # number of indexable fields accordingly
        length = (method.get_number_of_arguments() +
                  method.get_number_of_locals().get_embedded_integer() +
                  method.get_maximum_number_of_stack_elements().get_embedded_integer() + 2)
        result.set_number_of_indexable_fields_and_clear(length, self._nilObject)

        # Set the method of the frame and the previous frame
        result.set_method(method)
        if previous_frame:
            result.set_previous_frame(previous_frame)

        # Reset the stack pointer and the bytecode index
        result.reset_stack_pointer()
        result.set_bytecode_index(0)

        # Return the freshly allocated frame
        return result

    def new_method(self, signature, num_bytecodes, num_literals):
        # Allocate a new method and set its class to be the method class
        result = Method(self._nilObject)
        result.set_class(self._methodClass)

        # Set the signature and the number of bytecodes
        result.set_signature(signature)
        result.set_number_of_bytecodes(num_bytecodes)
        result.set_number_of_indexable_fields_and_clear(num_literals, self._nilObject)

        # Return the freshly allocated method
        return result

    def new_instance(self, instance_class):
        # Allocate a new instance and set its class to be the given class
359
        result = Object(self._nilObject, instance_class.get_number_of_instance_fields())
360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382
        result.set_class(instance_class)
 
        # Return the freshly allocated instance
        return result

 
    def new_integer(self, value):
        # Allocate a new integer and set its class to be the integer class
        result = Integer(self._nilObject)
        result.set_class(self._integerClass)
     
        # Set the embedded integer of the newly allocated integer
        result.set_embedded_integer(value)
     
        # Return the freshly allocated integer
        return result
 
    def new_big_integer(self, value):
        # Allocate a new integer and set its class to be the integer class
        result = BigInteger(self._nilObject)
        result.set_class(self._bigintegerClass)
 
        # Set the embedded integer of the newly allocated integer
383
        result.set_embedded_big_integer(value)
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
 
        # Return the freshly allocated integer
        return result
 
 
    def new_double(self, value):
        # Allocate a new integer and set its class to be the double class
        result = Double(self._nilObject)
        result.set_class(self._doubleClass)
 
        # Set the embedded double of the newly allocated double
        result.set_embedded_double(value)
 
        # Return the freshly allocated double
        return result
    
400 401 402 403 404 405 406 407 408 409
    def new_metaclass_class(self):
        # Allocate the metaclass classes
        result = Class(self)
        result.set_class(Class(self))

        # Setup the metaclass hierarchy
        result.get_class().set_class(result)

        # Return the freshly allocated metaclass class
        return result
410 411 412 413 414 415 416 417 418 419 420

    def new_string(self, embedded_string):
        # Allocate a new string and set its class to be the string class
        result = String(self._nilObject)
        result.set_class(self._stringClass)
 
        # Put the embedded string into the new string
        result.set_embedded_string(embedded_string)
 
        # Return the freshly allocated string
        return result
421
    
422 423 424 425 426 427 428 429 430 431 432 433 434 435
    def new_symbol(self, string):
        # Allocate a new symbol and set its class to be the symbol class
        result = Symbol(self._nilObject)
        result.set_class(self._symbolClass)

        # Put the string into the symbol
        result.set_string(string)

        # Insert the new symbol into the symbol table
        self._symbol_table.insert(result)

        # Return the freshly allocated symbol
        return result
      
436 437 438 439 440 441 442 443 444 445 446 447 448 449
    def new_system_class(self):
        # Allocate the new system class
        system_class = Class(self)

        # Setup the metaclass hierarchy
        system_class.set_class(Class(self))
        system_class.get_class().set_class(self._metaclassClass)

        # Return the freshly allocated system class
        return system_class
    
    def _initialize_system_class(self, system_class, super_class, name):
        # Initialize the superclass hierarchy
        if super_class:
450
            system_class.set_super_class(super_class)
451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
            system_class.get_class().set_super_class(super_class.get_class())
        else:
            system_class.get_class().set_super_class(self._classClass)
    

        # Initialize the array of instance fields
        system_class.set_instance_fields(self.new_array_with_length(0))
        system_class.get_class().set_instance_fields(self.new_array_with_length(0))

        # Initialize the array of instance invokables
        system_class.set_instance_invokables(self.new_array_with_length(0))
        system_class.get_class().set_instance_invokables(self.new_array_with_length(0))

        # Initialize the name of the system class
        system_class.set_name(self.symbol_for(name))
466
        system_class.get_class().set_name(self.symbol_for(name + " class"))
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487

        # Insert the system class into the dictionary of globals
        self.set_global(system_class.get_name(), system_class)
    
    
    def get_global(self, name):
        # Return the global with the given name if it's in the dictionary of globals
        if self.has_global(name):
            return self._globals[name]

        # Global not found
        return None

    def set_global(self, name, value):
        # Insert the given value into the dictionary of globals
        self._globals[name] = value
  

    def has_global(self, name):
        # Returns if the universe has a value for the global of the given name
        return name in self._globals
488
    
489
    def _get_block_class(self, number_of_arguments = None):
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541
        if not number_of_arguments:
            # Get the generic block class
            return self._blockClass
        
        # Compute the name of the block class with the given number of
        # arguments
        name = self.symbol_for("Block" + str(number_of_arguments))

        # Lookup the specific block class in the dictionary of globals and
        # return it
        if self.has_global(name):
            return self.get_global(name)

        # Get the block class for blocks with the given number of arguments
        result = self._loadClass(name, None)

        # Add the appropriate value primitive to the block class
        result.add_instance_primitive(Block.get_evaluation_primitive(number_of_arguments, self))

        # Insert the block class into the dictionary of globals
        self.set_global(name, result)

        # Return the loaded block class
        return result

    def load_class(self, name):
        # Check if the requested class is already in the dictionary of globals
        if self.has_global(name):
            return self.get_global(name)

        # Load the class
        result = self._load_class(name, None)

        # Load primitives (if necessary) and return the resulting class
        if result and result.has_primitives():
            result.load_primitives()
    
        return result

    def _load_system_class(self, system_class):
        # Load the system class
        result = self._load_class(system_class.get_name(), system_class)

        # Load primitives if necessary
        if result.has_primitives():
            result.load_primitives()

    def _load_class(self, name, system_class):
        # Try loading the class from all different paths
        for cpEntry in self._classpath:
            try:
                # Load the class from a file and return the loaded class
542
                result = sourcecode_compiler.compile_class_from_file(cpEntry, name.get_string(), system_class, self)
543
                if self._dump_bytecodes:
544 545
                    Disassembler.dump(result.get_class())
                    Disassembler.dump(result)
546 547 548 549 550 551 552 553

                return result
            except IOError:
                # Continue trying different paths
                pass

        # The class could not be found.
        return None
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570
    
    def load_shell_class(self, stmt):
        # Load the class from a stream and return the loaded class
        result = sourcecode_compiler.compile_class_from_string(stmt, None, self)
        if self._dumpBytecodes:
            Disassembler.dump(result)
        return result

    @classmethod
    def error_print(cls, msg):
        print(msg, file=sys.stderr, end="")

    @classmethod
    def error_println(cls, msg = ""):
        print(msg, file=sys.stderr)

    @classmethod
571
    def std_print(cls, msg):
572
        print(msg, end="")
573

574
    @classmethod
575
    def std_println(cls, msg=""):
576
        print(msg)
577 578 579 580 581 582 583 584

def main(args):
    u = Universe()
    u.interpret(args[1:])
    u.exit(0)

if __name__ == '__main__':
    main(sys.argv)