WARNING! Access to this system is limited to authorised users only.
Unauthorised users may be subject to prosecution.
Unauthorised access to this system is a criminal offence under Australian law (Federal Crimes Act 1914 Part VIA)
It is a criminal offence to:
(1) Obtain access to data without authority. -Penalty 2 years imprisonment.
(2) Damage, delete, alter or insert data without authority. -Penalty 10 years imprisonment.
User activity is monitored and recorded. Anyone using this system expressly consents to such monitoring and recording.

To protect your data, the CISO officer has suggested users to enable 2FA as soon as possible.
Currently 2.4% of users enabled 2FA.

universe.py 22.2 KB
Newer Older
Stefan Marr's avatar
Stefan Marr committed
1
from som.interpreter.interpreter import Interpreter
Stefan Marr's avatar
Stefan Marr committed
2
from som.interpreter.bytecodes   import Bytecodes 
Stefan Marr's avatar
Stefan Marr committed
3 4
from som.vm.symbol_table         import SymbolTable
from som.vmobjects.object        import Object
5 6 7
from som.vmobjects.clazz         import Class
from som.vmobjects.array         import Array
from som.vmobjects.symbol        import Symbol
Stefan Marr's avatar
Stefan Marr committed
8
from som.vmobjects.method        import Method
Stefan Marr's avatar
Stefan Marr committed
9
from som.vmobjects.integer       import Integer
10
from som.vmobjects.string        import String
11
from som.vmobjects.block         import Block, block_evaluation_primitive
12
from som.vmobjects.frame         import Frame
13
from som.vmobjects.biginteger    import BigInteger
14
from som.vmobjects.double        import Double
Stefan Marr's avatar
Stefan Marr committed
15

Stefan Marr's avatar
Stefan Marr committed
16 17
from som.vm.shell import Shell

18 19
import som.compiler.sourcecode_compiler as sourcecode_compiler

Stefan Marr's avatar
Stefan Marr committed
20
import os
21 22 23 24

class Exit(BaseException):
    def __init__(self, code):
        self.code = code
Stefan Marr's avatar
Stefan Marr committed
25 26 27

class Universe(object):
    
28
    def __init__(self, avoid_exit = False):
Stefan Marr's avatar
Stefan Marr committed
29 30 31 32 33
        self._interpreter    = Interpreter(self)
        self._symbol_table   = SymbolTable()
        
        self._globals        = {}
        
Tobias Pape's avatar
Tobias Pape committed
34 35 36 37 38 39
        self.nilObject      = None
        self.trueObject     = None
        self.falseObject    = None
        self.objectClass    = None
        self.classClass     = None
        self.metaclassClass = None
Stefan Marr's avatar
Stefan Marr committed
40
        
Tobias Pape's avatar
Tobias Pape committed
41 42 43 44 45 46 47 48 49 50 51 52
        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.stringClass    = None
        self.doubleClass    = None
Stefan Marr's avatar
Stefan Marr committed
53 54
        
        self._last_exit_code = 0
55
        self._avoid_exit     = avoid_exit
Tobias Pape's avatar
Tobias Pape committed
56 57
        self._dump_bytecodes = False
        self.classpath      = None
58

59 60 61 62
    def exit(self, error_code):
        if self._avoid_exit:
            self._last_exit_code = error_code
        else:
63
            raise Exit(error_code)
64 65 66 67
    
    def last_exit_code(self):
        return self._last_exit_code
    
68 69 70
    def get_interpreter(self):
        return self._interpreter
    
71 72 73 74 75 76 77 78 79 80
    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)
Stefan Marr's avatar
Stefan Marr committed
81
        
82
        return self.start(bootstrap_frame, invokable)
Stefan Marr's avatar
Stefan Marr committed
83
    
84 85 86 87 88 89
    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))
Tobias Pape's avatar
Tobias Pape committed
90
        bootstrap_method.set_holder(self.systemClass)
91
        return bootstrap_method
92
    
93 94 95 96 97 98
    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:
99
            bootstrap_frame.push(arguments)
100
        return bootstrap_frame
101 102
        
    
Stefan Marr's avatar
Stefan Marr committed
103 104
    def interpret(self, arguments):
        # Check for command line switches
105
        arguments = self.handle_arguments(arguments)
Stefan Marr's avatar
Stefan Marr committed
106 107

        # Initialize the known universe
108 109
        system_object = self._initialize_object_system()
        bootstrap_method = self._create_bootstrap_method()
Stefan Marr's avatar
Stefan Marr committed
110
        
111 112 113 114 115 116 117
        # 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:
118 119 120
            # Convert the arguments into an array
            arguments_array = self.new_array_with_strings(arguments)
            bootstrap_frame = self._create_bootstrap_frame(bootstrap_method, system_object, arguments_array)
121
            # Lookup the initialize invokable on the system class
Tobias Pape's avatar
Tobias Pape committed
122
            initialize = self.systemClass.lookup_invokable(self.symbol_for("initialize:"))
123 124 125 126 127 128 129 130 131

            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()
Stefan Marr's avatar
Stefan Marr committed
132
    
133
    def handle_arguments(self, arguments):
Stefan Marr's avatar
Stefan Marr committed
134 135 136 137 138 139 140 141
        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()
142
                self.setup_classpath(arguments[i + 1])
Stefan Marr's avatar
Stefan Marr committed
143 144 145 146 147 148
                i += 1    # skip class path
                got_classpath = True
            elif arguments[i] == "-d":
                self._dump_bytecodes = True
            else:
                remaining_args.append(arguments[i])
Tobias Pape's avatar
Tobias Pape committed
149
            i += 1
Stefan Marr's avatar
Stefan Marr committed
150 151 152
    
        if not got_classpath:
            # Get the default class path of the appropriate size
Tobias Pape's avatar
Tobias Pape committed
153
            self.classpath = self._setup_default_classpath()
Stefan Marr's avatar
Stefan Marr committed
154 155 156 157 158 159 160

        # 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
Tobias Pape's avatar
Tobias Pape committed
161
                self.classpath.insert(0, split[0])
Stefan Marr's avatar
Stefan Marr committed
162 163 164 165 166 167
        
            remaining_args[i] = split[1]
            i += 1
        
        return remaining_args
    
168
    def setup_classpath(self, cp):
Tobias Pape's avatar
Tobias Pape committed
169
        self.classpath = cp.split(os.pathsep)
Stefan Marr's avatar
Stefan Marr committed
170
    
171 172 173
    def _setup_default_classpath(self):
        return ['.']
    
Stefan Marr's avatar
Stefan Marr committed
174 175 176
    # take argument of the form "../foo/Test.som" and return
    # "../foo", "Test", "som"
    def _get_path_class_ext(self, path):
177 178 179 180 181 182 183 184 185 186 187 188
        path_and_file = path.rsplit(os.pathsep, 1)
        if len(path_and_file) <= 1:
            path = ""
        else:
            path = path_and_file[0]
        file_and_ext  = path_and_file[-1].rsplit(".", 1)
        if len(file_and_ext) <= 1:
            ext = ""
        else:
            ext = file_and_ext[-1]
        file_name = file_and_ext[0]
        return (path, file_name, ext)
189 190 191
    
    def _print_usage_and_exit(self):
        # Print the usage
192 193 194 195 196 197
        std_println("Usage: som [-options] [args...]                          ")
        std_println("                                                         ")
        std_println("where options include:                                   ")
        std_println("    -cp <directories separated by " + os.pathsep     + ">")
        std_println("                  set search path for application classes")
        std_println("    -d            enable disassembling")
198 199 200

        # Exit
        self.exit(0)
Stefan Marr's avatar
Stefan Marr committed
201

202
    def _initialize_object_system(self):
Stefan Marr's avatar
Stefan Marr committed
203
        # Allocate the nil object
Tobias Pape's avatar
Tobias Pape committed
204
        self.nilObject = Object(None)
Stefan Marr's avatar
Stefan Marr committed
205 206

        # Allocate the Metaclass classes
Tobias Pape's avatar
Tobias Pape committed
207
        self.metaclassClass = self.new_metaclass_class()
Stefan Marr's avatar
Stefan Marr committed
208 209

        # Allocate the rest of the system classes
Tobias Pape's avatar
Tobias Pape committed
210 211 212 213 214 215 216 217 218 219 220 221
        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()
Stefan Marr's avatar
Stefan Marr committed
222 223

        # Setup the class reference for the nil object
Tobias Pape's avatar
Tobias Pape committed
224
        self.nilObject.set_class(self.nilClass)
Stefan Marr's avatar
Stefan Marr committed
225 226

        # Initialize the system classes
Tobias Pape's avatar
Tobias Pape committed
227 228 229 230 231 232 233 234 235 236 237 238 239
        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")
Stefan Marr's avatar
Stefan Marr committed
240 241

        # Load methods and fields into the system classes
Tobias Pape's avatar
Tobias Pape committed
242 243 244 245 246 247 248 249 250 251 252 253 254
        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)
Stefan Marr's avatar
Stefan Marr committed
255 256

        # Load the generic block class
Tobias Pape's avatar
Tobias Pape committed
257
        self.blockClass = self.load_class(self.symbol_for("Block"))
Stefan Marr's avatar
Stefan Marr committed
258 259

        # Setup the true and false objects
Tobias Pape's avatar
Tobias Pape committed
260 261
        self.trueObject  = self.new_instance(self.load_class(self.symbol_for("True")))
        self.falseObject = self.new_instance(self.load_class(self.symbol_for("False")))
Stefan Marr's avatar
Stefan Marr committed
262 263

        # Load the system class and create an instance of it
Tobias Pape's avatar
Tobias Pape committed
264 265
        self.systemClass = self.load_class(self.symbol_for("System"))
        system_object = self.new_instance(self.systemClass)
Stefan Marr's avatar
Stefan Marr committed
266 267

        # Put special objects and classes into the dictionary of globals
Tobias Pape's avatar
Tobias Pape committed
268 269 270
        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)
271
        self.set_global(self.symbol_for("system"), system_object)
Tobias Pape's avatar
Tobias Pape committed
272 273
        self.set_global(self.symbol_for("System"), self.systemClass)
        self.set_global(self.symbol_for("Block"),  self.blockClass)
274 275
        return system_object
    
276 277 278 279 280 281 282 283 284
    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
285 286 287
    
    def new_array_with_length(self, length):
        # Allocate a new array and set its class to be the array class
Tobias Pape's avatar
Tobias Pape committed
288 289
        result = Array(self.nilObject)
        result.set_class(self.arrayClass)
290 291

        # Set the number of indexable fields to the given value (length)
Tobias Pape's avatar
Tobias Pape committed
292
        result.set_number_of_indexable_fields_and_clear(length, self.nilObject)
293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317

        # 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
318
    
319 320
    def new_block(self, method, context_frame, arguments):
        # Allocate a new block and set its class to be the block class
Tobias Pape's avatar
Tobias Pape committed
321
        result = Block(self.nilObject)
322 323 324 325 326 327 328 329 330 331 332
        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
333
        result = Class(self, class_class.get_number_of_instance_fields())
334 335 336 337 338 339 340
        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
Tobias Pape's avatar
Tobias Pape committed
341 342
        result = Frame(self.nilObject)
        result.set_class(self.frameClass)
343 344 345 346 347 348 349

        # 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)
Tobias Pape's avatar
Tobias Pape committed
350
        result.set_number_of_indexable_fields_and_clear(length, self.nilObject)
351 352 353 354 355 356 357 358 359 360 361 362 363 364 365

        # 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
Tobias Pape's avatar
Tobias Pape committed
366 367
        result = Method(self.nilObject)
        result.set_class(self.methodClass)
368 369 370 371

        # Set the signature and the number of bytecodes
        result.set_signature(signature)
        result.set_number_of_bytecodes(num_bytecodes)
Tobias Pape's avatar
Tobias Pape committed
372
        result.set_number_of_indexable_fields_and_clear(num_literals, self.nilObject)
373 374 375 376 377 378

        # 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
Tobias Pape's avatar
Tobias Pape committed
379
        result = Object(self.nilObject, instance_class.get_number_of_instance_fields())
380 381 382 383 384 385 386 387
        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
Tobias Pape's avatar
Tobias Pape committed
388 389
        result = Integer(self.nilObject)
        result.set_class(self.integerClass)
390 391 392 393 394 395 396
     
        # Set the embedded integer of the newly allocated integer
        result.set_embedded_integer(value)
     
        # Return the freshly allocated integer
        return result
 
397
    def new_biginteger(self, value):
398
        # Allocate a new integer and set its class to be the integer class
Tobias Pape's avatar
Tobias Pape committed
399 400
        result = BigInteger(self.nilObject)
        result.set_class(self.bigintegerClass)
401 402
 
        # Set the embedded integer of the newly allocated integer
403
        result.set_embedded_biginteger(value)
404 405 406 407 408 409 410
 
        # 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
Tobias Pape's avatar
Tobias Pape committed
411 412
        result = Double(self.nilObject)
        result.set_class(self.doubleClass)
413 414 415 416 417 418 419
 
        # Set the embedded double of the newly allocated double
        result.set_embedded_double(value)
 
        # Return the freshly allocated double
        return result
    
420 421 422 423 424 425 426 427 428 429
    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
430 431 432

    def new_string(self, embedded_string):
        # Allocate a new string and set its class to be the string class
Tobias Pape's avatar
Tobias Pape committed
433 434
        result = String(self.nilObject)
        result.set_class(self.stringClass)
435 436 437 438 439 440
 
        # Put the embedded string into the new string
        result.set_embedded_string(embedded_string)
 
        # Return the freshly allocated string
        return result
441
    
442 443
    def new_symbol(self, string):
        # Allocate a new symbol and set its class to be the symbol class
Tobias Pape's avatar
Tobias Pape committed
444 445
        result = Symbol(self.nilObject)
        result.set_class(self.symbolClass)
446 447 448 449 450 451 452 453 454 455

        # 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
      
456 457 458 459 460 461
    def new_system_class(self):
        # Allocate the new system class
        system_class = Class(self)

        # Setup the metaclass hierarchy
        system_class.set_class(Class(self))
Tobias Pape's avatar
Tobias Pape committed
462
        system_class.get_class().set_class(self.metaclassClass)
463 464 465 466 467 468 469

        # 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:
470
            system_class.set_super_class(super_class)
471 472
            system_class.get_class().set_super_class(super_class.get_class())
        else:
Tobias Pape's avatar
Tobias Pape committed
473
            system_class.get_class().set_super_class(self.classClass)
474 475 476 477 478 479 480 481 482 483 484 485
    

        # 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))
486
        system_class.get_class().set_name(self.symbol_for(name + " class"))
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507

        # 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
508
    
509
    def _get_block_class(self, number_of_arguments = None):
510 511
        if not number_of_arguments:
            # Get the generic block class
Tobias Pape's avatar
Tobias Pape committed
512
            return self.blockClass
513 514 515 516 517 518 519 520 521 522 523
        
        # 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
Stefan Marr's avatar
Stefan Marr committed
524
        result = self._load_class(name, None)
525 526

        # Add the appropriate value primitive to the block class
527
        result.add_instance_primitive(block_evaluation_primitive(number_of_arguments, self))
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558

        # 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
Tobias Pape's avatar
Tobias Pape committed
559
        for cpEntry in self.classpath:
560 561
            try:
                # Load the class from a file and return the loaded class
562
                result = sourcecode_compiler.compile_class_from_file(cpEntry, name.get_string(), system_class, self)
563
                if self._dump_bytecodes:
564 565 566
                    from som.compiler.disassembler import dump
                    dump(result.get_class())
                    dump(result)
567 568 569 570 571 572 573 574

                return result
            except IOError:
                # Continue trying different paths
                pass

        # The class could not be found.
        return None
575 576 577 578
    
    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)
Stefan Marr's avatar
Stefan Marr committed
579
        if self._dump_bytecodes:
580 581
            from som.compiler.disassembler import dump
            dump(result)
582 583
        return result

584
def error_print(msg):
585
    os.write(2, msg)
586

587
def error_println(msg = ""):
588
    os.write(2, msg + "\n")
589

590
def std_print(msg):
591
    print msg,
592

593
def std_println(msg=""):
594 595
    print msg

596 597 598 599 600 601 602

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

if __name__ == '__main__':
603 604 605 606 607
    import sys
    try:
        main(sys.argv)
    except Exit as e:
        sys.exit(e.code)