universe.py 19.6 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
    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)
    
83 84
    def interpret(self, arguments):
        # Check for command line switches
85
        arguments = self.handle_arguments(arguments)
86 87 88 89 90 91

        # Initialize the known universe
        self.initialize(arguments)
        
        self.start()
    
92
    def handle_arguments(self, arguments):
93 94 95 96 97 98 99 100
        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()
101
                self.setup_classpath(arguments[i + 1])
102 103 104 105 106 107 108 109 110 111
                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
112
            self._classpath = self._setup_default_classpath()
113 114 115 116 117 118 119 120 121 122 123 124 125 126

        # 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
    
127
    def setup_classpath(self, cp):
128 129
        self._classpath = cp.split(os.pathsep)
    
130 131 132
    def _setup_default_classpath(self):
        return ['.']
    
133 134 135 136 137 138 139
    # 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:])

140
    def _initialize_object_system(self):
141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
        # 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
162
        self._nilObject.set_class(self._nilClass)
163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194

        # 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
195
        self._blockClass = self.load_class(self.symbol_for("Block"))
196 197

        # Setup the true and false objects
Stefan Marr's avatar
Stefan Marr committed
198 199
        self._trueObject  = self.new_instance(self.load_class(self.symbol_for("True")))
        self._falseObject = self.new_instance(self.load_class(self.symbol_for("False")))
200 201

        # Load the system class and create an instance of it
Stefan Marr's avatar
Stefan Marr committed
202
        self._systemClass = self.load_class(self.symbol_for("System"))
Stefan Marr's avatar
Stefan Marr committed
203
        system_object = self.new_instance(self._systemClass)
204 205

        # Put special objects and classes into the dictionary of globals
206 207 208
        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)
209
        self.set_global(self.symbol_for("system"), system_object)
210 211
        self.set_global(self.symbol_for("System"), self._systemClass)
        self.set_global(self.symbol_for("Block"),  self._blockClass)
212 213
        return system_object
    
214 215 216 217 218 219 220 221 222
    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
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
    
    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
256
    
257 258 259 260 261 262 263 264 265 266 267 268 269 270
    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
271
        result = Class(self, class_class.get_number_of_instance_fields())
272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316
        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
317
        result = Object(self._nilObject, instance_class.get_number_of_instance_fields())
318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340
        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
341
        result.set_embedded_big_integer(value)
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
 
        # 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
    
358 359 360 361 362 363 364 365 366 367
    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
368 369 370 371 372 373 374 375 376 377 378

    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
379
    
380 381 382 383 384 385 386 387 388 389 390 391 392 393
    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
      
394 395 396 397 398 399 400 401 402 403 404 405 406 407
    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:
408
            system_class.set_super_class(super_class)
409 410 411 412 413 414 415 416 417 418 419 420 421 422 423
            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))
424
        system_class.get_class().set_name(self.symbol_for(name + " class"))
425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445

        # 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
446
    
447
    def _get_block_class(self, number_of_arguments = None):
448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499
        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
500
                result = sourcecode_compiler.compile_class_from_file(cpEntry, name.get_string(), system_class, self)
501
                if self._dump_bytecodes:
502 503
                    Disassembler.dump(result.get_class())
                    Disassembler.dump(result)
504 505 506 507 508 509 510 511

                return result
            except IOError:
                # Continue trying different paths
                pass

        # The class could not be found.
        return None
512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528
    
    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
529
    def std_print(cls, msg):
530
        print(msg, end="")
531

532
    @classmethod
533
    def std_println(cls, msg=""):
534
        print(msg)
535 536 537 538 539 540 541 542

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

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