def __init__(self, avoid_exit=False):
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._stringClass = None
self._doubleClass = None
self._last_exit_code = 0
self._avoid_exit = avoid_exit
self._classpath = None
self._dump_bytecodes = False
def __init__(self, avoid_exit = False):
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._stringClass = None
self._doubleClass = None
self._last_exit_code = 0
self._avoid_exit = avoid_exit
self._classpath = None
self._dump_bytecodes = False
class SymbolTableTestCase(unittest.TestCase):
def setUp(self):
self.table = SymbolTable()
self.symbol = Symbol(nilObject=Object(None), value="foo")
def test_insert(self):
self.assertIsNone(self.table.lookup("foo"))
self.table.insert(self.symbol)
self.assertEqual(self.symbol, self.table._map["foo"])
def test_lookup(self):
self.table.insert(self.symbol)
self.assertEqual(self.table.lookup("foo"), self.symbol)
class Universe(object):
def __init__(self, avoid_exit = False):
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._stringClass = None
self._doubleClass = None
self._last_exit_code = 0
self._avoid_exit = avoid_exit
self._classpath = None
self._dump_bytecodes = False
@property
def nilObject(self):
return self._nilObject
@property
def trueObject(self):
return self._trueObject
@property
def falseObject(self):
return self._falseObject
@property
def objectClass(self):
return self._objectClass
@property
def classClass(self):
return self._classClass
@property
def nilClass(self):
return self._nilClass
@property
def integerClass(self):
return self._integerClass
@property
def bigintegerClass(self):
return self._bigintegerClass
@property
def arrayClass(self):
return self._arrayClass
@property
def methodClass(self):
return self._methodClass
@property
def symbolClass(self):
return self._symbolClass
@property
def frameClass(self):
return self._frameClass
@property
def systemClass(self):
return self._systemClass
@property
def blockClass(self):
return self._blockClass
@property
def stringClass(self):
return self._stringClass
@property
def doubleClass(self):
return self._doubleClass
@property
def primitiveClass(self):
return self._primitiveClass
@property
def metaclassClass(self):
return self._metaclassClass
def exit(self, error_code):
if self._avoid_exit:
self._last_exit_code = error_code
else:
sys.exit(error_code)
def last_exit_code(self):
return self._last_exit_code
def get_interpreter(self):
return self._interpreter
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)
return self.start(bootstrap_frame, invokable)
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,
self.new_integer(0),
self.new_integer(2))
bootstrap_method.set_bytecode(0, Bytecodes.halt)
bootstrap_method.set_holder(self._systemClass)
return bootstrap_method
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, self._nilObject)
bootstrap_frame.push(receiver)
if arguments:
bootstrap_frame.push(arguments)
return bootstrap_frame
def interpret(self, arguments):
# Check for command line switches
arguments = self.handle_arguments(arguments)
# Initialize the known universe
system_object = self._initialize_object_system()
bootstrap_method = self._create_bootstrap_method()
# 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:
# 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)
# 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()
def handle_arguments(self, arguments):
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()
self.setup_classpath(arguments[i + 1])
i += 1 # skip class path
got_classpath = True
elif arguments[i] == "-d":
self._dump_bytecodes = True
elif arguments[i] in ["-h", "--help", "-?"]:
self._print_usage_and_exit()
else:
remaining_args.append(arguments[i])
i += 1
if not got_classpath:
# Get the default class path of the appropriate size
self._classpath = self._setup_default_classpath()
# 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
def setup_classpath(self, cp):
self._classpath = cp.split(os.pathsep)
def _setup_default_classpath(self):
return ['.']
# 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:])
def _print_usage_and_exit(self):
# Print the usage
self.std_println("Usage: som [-options] [args...] ")
self.std_println(" ")
self.std_println("where options include: ")
self.std_println(" -cp <directories separated by " + os.pathsep + ">")
self.std_println(" set search path for application classes")
self.std_println(" -d enable disassembling")
self.std_println(" -h print this help")
# Exit
self.exit(0)
def _initialize_object_system(self):
# 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
self._nilObject.set_class(self._nilClass)
# 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
self._blockClass = self.load_class(self.symbol_for("Block"))
# Setup the true and false objects
trueClassName = self.symbol_for("True")
trueClass = self.load_class(trueClassName)
self._trueObject = self.new_instance(trueClass)
falseClassName = self.symbol_for("False")
falseClass = self.load_class(falseClassName)
self._falseObject = self.new_instance(falseClass)
# Load the system class and create an instance of it
self._systemClass = self.load_class(self.symbol_for("System"))
system_object = self.new_instance(self._systemClass)
# Put special objects and classes into the dictionary of globals
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)
self.set_global(self.symbol_for("system"), system_object)
self.set_global(self.symbol_for("System"), self._systemClass)
self.set_global(self.symbol_for("Block"), self._blockClass)
self.set_global(self.symbol_for("Nil"), self.nilClass)
self.set_global( trueClassName, trueClass)
self.set_global(falseClassName, falseClass)
return system_object
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
def new_array_with_length(self, length):
# Allocate a new array and set its class to be the array class
result = Array(self._nilObject, length)
result.set_class(self._arrayClass)
# 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
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, method, context_frame)
result.set_class(self._get_block_class(arguments))
# 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
result = Class(self, class_class.get_number_of_instance_fields())
result.set_class(class_class)
# Return the freshly allocated class
return result
def new_frame(self, previous_frame, method, context):
# 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)
# Allocate a new frame and set its class to be the frame class
result = Frame(self._nilObject, length, method, context, previous_frame)
result.set_class(self._frameClass)
# 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,
num_locals, maximum_number_of_stack_elements):
# Allocate a new method and set its class to be the method class
result = Method(self._nilObject,
num_literals,
num_locals,
maximum_number_of_stack_elements,
num_bytecodes,
signature)
result.set_class(self._methodClass)
# 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
result = Object(self._nilObject, instance_class.get_number_of_instance_fields())
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, value)
result.set_class(self._integerClass)
# Return the freshly allocated integer
return result
def new_biginteger(self, value):
# Allocate a new integer and set its class to be the integer class
result = BigInteger(self._nilObject, value)
result.set_class(self._bigintegerClass)
# 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, value)
result.set_class(self._doubleClass)
# Return the freshly allocated double
return result
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
def new_string(self, embedded_string):
# Allocate a new string and set its class to be the string class
result = String(self._nilObject, embedded_string)
result.set_class(self._stringClass)
# Return the freshly allocated string
return result
def new_symbol(self, string):
# Allocate a new symbol and set its class to be the symbol class
result = Symbol(self._nilObject, string)
result.set_class(self._symbolClass)
# Insert the new symbol into the symbol table
self._symbol_table.insert(result)
# Return the freshly allocated symbol
return result
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:
system_class.set_super_class(super_class)
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))
system_class.get_class().set_name(self.symbol_for(name + " class"))
# 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
def _get_block_class(self, number_of_arguments = None):
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._load_class(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)
if not result:
error_println(system_class.get_name().get_string()
+ " class could not be loaded. It is likely that the "
+ " class path has not been initialized properly. "
+ "Please make sure that the '-cp' parameter is given on the command-line.")
self.exit(200)
# 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
result = sourcecode_compiler.compile_class_from_file(cpEntry, name.get_string(), system_class, self)
if self._dump_bytecodes:
from som.compiler.disassembler import Disassembler
Disassembler.dump(result.get_class())
Disassembler.dump(result)
return result
except IOError:
# Continue trying different paths
pass
# The class could not be found.
return None
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._dump_bytecodes:
from som.compiler.disassembler import Disassembler
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
def std_print(cls, msg):
print(msg, end="")
@classmethod
def std_println(cls, msg=""):
print(msg)
def setUp(self):
self.table = SymbolTable()
self.symbol = Symbol(nilObject=Object(None), value="foo")
class Universe(object):
def __init__(self, avoid_exit=False):
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._stringClass = None
self._doubleClass = None
self._last_exit_code = 0
self._avoid_exit = avoid_exit
self._classpath = None
self._dump_bytecodes = False
@property
def nilObject(self):
return self._nilObject
@property
def trueObject(self):
return self._trueObject
@property
def falseObject(self):
return self._falseObject
@property
def objectClass(self):
return self._objectClass
@property
def classClass(self):
return self._classClass
@property
def nilClass(self):
return self._nilClass
@property
def integerClass(self):
return self._integerClass
@property
def bigintegerClass(self):
return self._bigintegerClass
@property
def arrayClass(self):
return self._arrayClass
@property
def methodClass(self):
return self._methodClass
@property
def symbolClass(self):
return self._symbolClass
@property
def frameClass(self):
return self._frameClass
@property
def systemClass(self):
return self._systemClass
@property
def blockClass(self):
return self._blockClass
@property
def stringClass(self):
return self._stringClass
@property
def doubleClass(self):
return self._doubleClass
@property
def primitiveClass(self):
return self._primitiveClass
@property
def metaclassClass(self):
return self._metaclassClass
def exit(self, error_code):
if self._avoid_exit:
self._last_exit_code = error_code
else:
sys.exit(error_code)
def last_exit_code(self):
return self._last_exit_code
def get_interpreter(self):
return self._interpreter
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)
return self.start(bootstrap_frame, invokable)
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,
self.new_integer(0),
self.new_integer(2))
bootstrap_method.set_bytecode(0, Bytecodes.halt)
bootstrap_method.set_holder(self._systemClass)
return bootstrap_method
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, self._nilObject)
bootstrap_frame.push(receiver)
if arguments:
bootstrap_frame.push(arguments)
return bootstrap_frame
def interpret(self, arguments):
# Check for command line switches
arguments = self.handle_arguments(arguments)
# Initialize the known universe
system_object = self._initialize_object_system()
bootstrap_method = self._create_bootstrap_method()
# 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:
# 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)
# 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()
def handle_arguments(self, arguments):
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()
self.setup_classpath(arguments[i + 1])
i += 1 # skip class path
got_classpath = True
elif arguments[i] == "-d":
self._dump_bytecodes = True
elif arguments[i] in ["-h", "--help", "-?"]:
self._print_usage_and_exit()
else:
remaining_args.append(arguments[i])
i += 1
if not got_classpath:
# Get the default class path of the appropriate size
self._classpath = self._setup_default_classpath()
# 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
def setup_classpath(self, cp):
self._classpath = cp.split(os.pathsep)
def _setup_default_classpath(self):
return ['.']
# 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:])
def _print_usage_and_exit(self):
# Print the usage
self.std_println(
"Usage: som [-options] [args...] ")
self.std_println(
" ")
self.std_println(
"where options include: ")
self.std_println(" -cp <directories separated by " + os.pathsep +
">")
self.std_println(
" set search path for application classes")
self.std_println(" -d enable disassembling")
self.std_println(" -h print this help")
# Exit
self.exit(0)
def _initialize_object_system(self):
# 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
self._nilObject.set_class(self._nilClass)
# 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
self._blockClass = self.load_class(self.symbol_for("Block"))
# Setup the true and false objects
trueClassName = self.symbol_for("True")
trueClass = self.load_class(trueClassName)
self._trueObject = self.new_instance(trueClass)
falseClassName = self.symbol_for("False")
falseClass = self.load_class(falseClassName)
self._falseObject = self.new_instance(falseClass)
# Load the system class and create an instance of it
self._systemClass = self.load_class(self.symbol_for("System"))
system_object = self.new_instance(self._systemClass)
# Put special objects and classes into the dictionary of globals
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)
self.set_global(self.symbol_for("system"), system_object)
self.set_global(self.symbol_for("System"), self._systemClass)
self.set_global(self.symbol_for("Block"), self._blockClass)
self.set_global(self.symbol_for("Nil"), self.nilClass)
self.set_global(trueClassName, trueClass)
self.set_global(falseClassName, falseClass)
return system_object
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
def new_array_with_length(self, length):
# Allocate a new array and set its class to be the array class
result = Array(self._nilObject, length)
result.set_class(self._arrayClass)
# 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
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, method, context_frame)
result.set_class(self._get_block_class(arguments))
# 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
result = Class(self, class_class.get_number_of_instance_fields())
result.set_class(class_class)
# Return the freshly allocated class
return result
def new_frame(self, previous_frame, method, context):
# 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)
# Allocate a new frame and set its class to be the frame class
result = Frame(self._nilObject, length, method, context,
previous_frame)
result.set_class(self._frameClass)
# 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, num_locals,
maximum_number_of_stack_elements):
# Allocate a new method and set its class to be the method class
result = Method(self._nilObject, num_literals, num_locals,
maximum_number_of_stack_elements, num_bytecodes,
signature)
result.set_class(self._methodClass)
# 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
result = Object(self._nilObject,
instance_class.get_number_of_instance_fields())
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, value)
result.set_class(self._integerClass)
# Return the freshly allocated integer
return result
def new_biginteger(self, value):
# Allocate a new integer and set its class to be the integer class
result = BigInteger(self._nilObject, value)
result.set_class(self._bigintegerClass)
# 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, value)
result.set_class(self._doubleClass)
# Return the freshly allocated double
return result
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
def new_string(self, embedded_string):
# Allocate a new string and set its class to be the string class
result = String(self._nilObject, embedded_string)
result.set_class(self._stringClass)
# Return the freshly allocated string
return result
def new_symbol(self, string):
# Allocate a new symbol and set its class to be the symbol class
result = Symbol(self._nilObject, string)
result.set_class(self._symbolClass)
# Insert the new symbol into the symbol table
self._symbol_table.insert(result)
# Return the freshly allocated symbol
return result
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:
system_class.set_super_class(super_class)
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))
system_class.get_class().set_name(self.symbol_for(name + " class"))
# 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
def _get_block_class(self, number_of_arguments=None):
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._load_class(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)
if not result:
error_println(
system_class.get_name().get_string() +
" class could not be loaded. It is likely that the " +
" class path has not been initialized properly. " +
"Please make sure that the '-cp' parameter is given on the command-line."
)
self.exit(200)
# 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
result = sourcecode_compiler.compile_class_from_file(
cpEntry, name.get_string(), system_class, self)
if self._dump_bytecodes:
from som.compiler.disassembler import Disassembler
Disassembler.dump(result.get_class())
Disassembler.dump(result)
return result
except IOError:
# Continue trying different paths
pass
# The class could not be found.
return None
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._dump_bytecodes:
from som.compiler.disassembler import Disassembler
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
def std_print(cls, msg):
print(msg, end="")
@classmethod
def std_println(cls, msg=""):
print(msg)
