def p_while_stmt(p):
"while_stmt : WHILE LEFTPAREN cond RIGHTPAREN decl_block_var stmt_list ENDWHILE"
global currentScope, currentBlock
currentScope = currentScope.getParent()
blockScope = SymbolTable("BLOCK " + str(currentBlock), currentScope)
lastBlock = "BLOCK " + str(currentBlock)
currentScope.addChild(blockScope)
currentBlock += 1
#currentScope = blockScope
if len(blockList.getValues()) > 0:
for var in blockList.getValues():
blockScope.addVariable(var)
blockList.clear()
tempRep = IRRep()
tempLabel = irlist.nextLabel()
tempNode1 = IRNode("LABEL", tempLabel, "", "", None, None)
tempRep.addToEnd(tempNode1)
tempRep.addToEnd(p[3][0].first)
tempRep.addToEnd(p[6][0].first)
tempNode2 = IRNode("JUMP", tempLabel, "", "", None, None)
tempRep.addToEnd(tempNode2)
tempNode3 = IRNode("LABEL", p[3][1], "", "", None, None)
tempRep.addToEnd(tempNode3)
p[0] = [tempRep]
def p_if_stmt(p):
"if_stmt : IF LEFTPAREN cond RIGHTPAREN decl_block_var stmt_list else_part ENDIF"
global currentScope, currentBlock, lastBlock
currentScope = currentScope.getParent()
blockScope = SymbolTable("BLOCK " + str(currentBlock), currentScope)
lastBlock = "BLOCK " + str(currentBlock)
currentScope.addChild(blockScope)
currentBlock += 1
# currentScope = blockScope
# currentBlock
if len(blockList.getValues()) > 0:
for var in blockList.getValues():
blockScope.addVariable(var)
blockList.clear()
tempRep = IRRep()
tempRep.addToEnd(p[3][0].first)
tempRep.addToEnd(p[6][0].first)
if(p[7] is not None):
skipLabel = irlist.nextLabel()
tempNode1 = IRNode("JUMP", skipLabel, "", "", None, None)
tempNode2 = IRNode("LABEL", p[3][1], "", "", None, None)
tempRep.addToEnd(tempNode1)
tempRep.addToEnd(tempNode2)
tempRep.addToEnd(p[7][0].first)
tempNode3 = IRNode("LABEL", skipLabel, "", "", None, None)
tempRep.addToEnd(tempNode3)
else:
tempNode = IRNode("LABEL", p[3][1], "", "", None, None)
tempRep.addToEnd(tempNode)
p[0] = [tempRep]
class Assembler:
"""Handles file I/O"""
def __init__(self, files):
self.files = files
self.symtable = SymbolTable()
def hasFiles(self):
"""Are there more files to process?"""
return len(self.files) > 0
def dummyPass(self):
"""Do a soft pass to determine the location for labels (Xxx)"""
filename = self.files[0]
p = Parser(filename)
current_address = 0
while p.hasMoreCommands():
p.advance()
cmd_type = p.commandType()
if cmd_type is A_COMMAND or cmd_type is C_COMMAND:
current_address += 1
elif cmd_type is L_COMMAND:
self.symtable.addEntry(p.symbol(), current_address)
def processFile(self):
"""Translates the next file in the queue"""
filename = self.files.pop(0)
p = Parser(filename)
if filename.endswith('.asm'):
fileout = filename.replace('.asm', '.hack')
else:
fileout = filename + '.hack'
f = open(fileout, 'w')
print("Translating %s" % (filename))
self.current_address = 16
while p.hasMoreCommands():
p.advance()
if p.commandType() is A_COMMAND:
address = self._getAddress(p.symbol())
instruction = '{0:016b}'.format(int(address))
elif p.commandType() is C_COMMAND: # dest=comp;jump
instruction = ''.join(['111', Code.comp(p.comp()),
Code.dest(p.dest()), Code.jump(p.jump())])
else: # L_COMMAND (Xxx)
continue
#print("Symbol: %s. Instruction: %s" % (p.symbol(), instruction))
print(instruction, end='\n', file=f)
f.close()
def _getAddress(self, symbol):
if symbol.isdigit():
return symbol
else:
if not self.symtable.contains(symbol):
self.symtable.addEntry(symbol, self.current_address)
self.current_address += 1
return self.symtable.GetAddress(symbol)
def collect(self):
table = SymbolTable()
offset = 1
global label
for decl in self.decls:
if type(decl) == M_var:
table.insert(decl.name,decl.internalType, "VAR", offset)
offset += 1
elif type(decl) == M_fun:
table.insert(decl.name,decl.returnType, "FUN", ("fn" + str(label),decl.params))
label += 1
return table
def subroutineCall(tokens):
global pos,fpw
# something about subroutine call, if:(1) a(...), then a is a method;
# (2) a.b(...) in such case, if a is a variable, is a method, else if function or constructor
if tokens[pos+1] == '.': # subroutine call, may be a method or a function
# if symbol is of kind field, static ot var, then this will be a method
kind = SymbolTable.kindOf(tokens[pos])
# if kind is a variable
if kind != 'none':
index = SymbolTable.indexOf(tokens[pos])
type_ = SymbolTable.typeOf(tokens[pos])
# funcName = className.funcName
funcName = type_ + tokens[pos+1]+tokens[pos+2]
pos += 4 # parameterList
# push arguments onto stack
if kind == 'var':
kind = 'local'
elif kind == 'field':
kind = 'this'
fpw.write('push '+kind+' '+str(index)+'\n')
argNum = CompileExpressionList(tokens)
# call funcName argNum
fpw.write('call '+funcName+' '+str(argNum+1)+'\n') # call function
pos += 1
# if kind is a classname
else:
funcName = tokens[pos] + tokens[pos+1] + tokens[pos+2] # 'className.funcName'
pos += 4 # parameterList
# push arguments onto stack
argNum = CompileExpressionList(tokens)
# call funcName argNum
fpw.write('call '+funcName+' '+str(argNum)+'\n')
# ')'
pos += 1
# not have '.', then it is a method
elif tokens[pos+1] == '(':
funcName = tokens[pos]
# push this on the stack
fpw.write('push pointer 0\n') # same with 'push pointer 0'
pos += 2
argNum = CompileExpressionList(tokens)
# ')'
fpw.write('call '+className+'.'+funcName+' '+str(argNum+1)+'\n')
pos += 1
def LookUp(symbol):
#Is symbol in hash table? returns True or False.
Display("Lookup", _list)
pointer = SymbolTable.getPointer(symbol)
if pointer != None:
return True
return False
def __init__(self, file):
self.lex = Lex(file)
self.symbols = SymbolTable()
self.vm = VMWriter()
self.openout(file)
self.compile_class()
self.closeout()
def visit_CompoundInstruction(self, compInstr):
if __debug__: print "visit_CompoundInstruction in line",compInstr.lineno
prevTable = self.symbolTable
self.symbolTable = SymbolTable(prevTable,"compInstr("+str(compInstr.lineno)+") scope")
self.analyzeDeclarations(compInstr.decl)
self.analyzeInstrBlock(compInstr.instr)
self.symbolTable = prevTable
return 'void'
def CompileSubroutine(tokens): # subroutine declaration begins
global pos,className
# clear previous subroutine symbol table, and start a new one
SymbolTable.startSubroutine()
# constructor void funcName(parameterList){...}
funcKind = tokens[pos] # get function kind: method, function, or constructor
pos += 1
funcType = tokens[pos]
pos += 1
funcName = className + '.' + tokens[pos] # set subroutine name
if funcKind == 'method':
# firstly put 'this' into symbol table
SymbolTable.Define('this',funcType,'argument')
pos += 2
# parameter list of this function
CompileParameterList(tokens)
pos += 1
# begin subroutineBody '{'
pos += 1
# count number of local variables
var_num = 0
if tokens[pos] == 'var':
# begin VarDec*
while (tokens[pos] == 'var'):
var_num += CompileVarDec(tokens)
# function funcName var_num
fpw.write('function '+ funcName+' '+str(var_num)+'\n')
if funcKind == 'method':
# each method should start with these two VM conmands
fpw.write('push argument 0\n'+'pop pointer 0\n')
elif funcKind == 'constructor':
# get the number of fields in this class and alloc memory for this instance
size = SymbolTable.field_index
fpw.write('push constant '+str(size)+'\n')
fpw.write('call Memory.alloc 1\n')
fpw.write('pop pointer 0\n')
if (tokens[pos] in ['do','let','return','if','while']): # begin statements
CompileStatements(tokens)
# '}' subroutine body ends
pos += 1 # subroutine declaration ends
def visit_FunctionDef(self, node, table):
symbol = FunctionSymbol(node.rettype, node.name, node.fmlparams)
if not table.put(symbol):
self.handle_error(node.pos, 'Symbol ' + symbol.name + ' is already defined')
#else:
#print 'DEBUG: Added function symbol ' + symbol.name + ' with return type ' + symbol.rettype
subtable = SymbolTable(table, symbol)
for fmlparam in node.fmlparams.args:
type = fmlparam.type
id = fmlparam.id
symbol = VariableSymbol(type, id)
if not subtable.put(symbol):
self.handle_error(node.pos, 'Parameter ' + id + ' already declared')
node.body.accept(self, subtable)
def visit_Program(self, program):
if __debug__: print "visit_Program in line",program.lineno
self.symbolTable = SymbolTable(None,"program scope")
self.analyzeDeclarations(program.decl)
self.analyzeFunDeclarations(program.fundef)
self.analyzeInstrBlock(program.instr)
#if __debug__:
print "symbolTable: ", self.symbolTable.currentScope
return self.errors is 0
def p_else_part(p):
'''else_part : ELSE decl_block_var stmt_list
| empty'''
global currentScope, currentBlock, lastBlock
if len(p) > 2:
currentScope = currentScope.getParent()
blockScope = SymbolTable("BLOCK " + str(currentBlock), currentScope)
lastBlock = "BLOCK " + str(currentBlock)
currentScope.addChild(blockScope)
currentBlock += 1
# currentScope = blockScope
if len(blockList.getValues()) > 0:
for var in blockList.getValues():
blockScope.addVariable(var)
blockList.clear()
if(p[1] is not None):
p[0] = [p[3][0]]
else:
p[0] = None
def __init__(self, filename):
i = filename.find('.')
if i != -1:
self.filename = filename[:i]
else:
self.filename = filename
self.p = Parser(filename)
self.buff = []
self.ops = []
self.table = SymbolTable()
def visit_FunctionDefinition(self, funDef):
if __debug__: print "visit_FunctionDefinition in line",funDef.lineno
prevTable = self.symbolTable
self.symbolTable = SymbolTable(prevTable, "fundef("+funDef.ident+") scope")
if funDef.args is not None:
for arg in funDef.args:
self.symbolTable.put(arg.ident, VariableSymbol(arg.ident, arg.typ, arg))
self.analyzeInstrBlock(funDef.instr)
self.symbolTable = prevTable
return funDef.typ
def p_func_declaration(p):
'''func_declaration : FUNCTION any_type IDENTIFIER LEFTPAREN param_decl_list RIGHTPAREN BEGIN func_body END '''
global currentScope, lastFunc
currentScope = currentScope.getParent()
funcScope = SymbolTable(p[3], currentScope)
currentScope.insertChild(funcScope, lastFunc)
if not lastBlock == "":
lastFunc = lastBlock
else:
lastFunc = p[3]
# currentScope = funcScope
params = parameterList.getValues()
if len(params) > 0:
for p in params:
funcScope.addVariable(p)
parameterList.clear()
if len(funcList.getValues()) > 0:
for v in funcList.getValues():
funcScope.addVariable(v)
funcList.clear()
def main():
"""Drives the entire translation process."""
"""Preprocess the file"""
pp = Preprocessor()
pp.remove_white_spaces_comments()
pp.write_temp_file()
"""First pass - adds labels to the symbol table."""
parser = Parser(sys.argv[1] + '.tmp')
symbol_table = SymbolTable()
pc = -1
while parser.has_more_commands():
parser.advance()
command_type = parser.command_type()
if command_type == 'A_COMMAND' or command_type == 'C_COMMAND':
pc += 1
elif command_type == 'L_COMMAND':
label = parser.symbol()
symbol_table.addEntry(label, pc + 1)
"""Second pass - handles variables names and writes the *.hack file."""
ram_address = 16
parser = Parser(sys.argv[1] + '.tmp')
code = Code()
file_name = parser.get_file_name()
hack_file = open(file_name + '.hack', 'w')
while parser.has_more_commands():
parser.advance()
command_type = parser.command_type()
if command_type == 'A_COMMAND':
a_symbol = parser.symbol()
if a_symbol[0] in '0123456789':
a_symbol_binary = code.convert_to_binary(a_symbol)
hack_file.write('0' + a_symbol_binary + '\n')
else:
if symbol_table.contains(a_symbol) is False:
symbol_table.addEntry(a_symbol, ram_address)
ram_address += 1
address = symbol_table.GetAddress(a_symbol)
address_binary = code.convert_to_binary(address)
hack_file.write('0' + address_binary + '\n')
elif command_type == 'C_COMMAND':
comp = code.comp(parser.comp())
dest = code.dest(parser.dest())
jump = code.jump(parser.jump())
hack_file.write('111' + comp + dest + jump + '\n')
hack_file.close()
def functiondec(op):
varList = []
if int(op[3]) > 1:
print("Error: cannot have several out parameters")
exit()
if (op[1] in funcSt):
print("Error: " + op[1] + " is defined")
exit()
inPar = []
for i in range(int(op[2])):
global currentLine
currentLine += 1
temp = code[currentLine].split(' ')
if temp[2] in varList:
print("Error: parameter cannot be the same name")
exit()
inPar.append(createSymbol(code[currentLine]))
varList.append(temp[2])
currentLine += 1
if code[currentLine][0:3] == "OPT":
temp = code[currentLine].split(' ')
if temp[2] in varList:
print("Error: parameter cannot be the same name")
exit()
outPar = createSymbol(code[currentLine])
varList.append(temp[2])
currentLine += 1
else:
outPar = None
par = SymbolTable.parList(inPar,outPar)
startLine = currentLine
funcSt[op[1]] = SymbolTable.Function(par,startLine)
while code[currentLine][0:3] != "SRT":
temp = code[currentLine].split(' ')
if(temp[0] == "LBL" and temp[1] == op[1] + "END"):
break
currentLine += 1
class Syntax():
def __init__(self,lexicalAnalysis):
self.Lexical = lexicalAnalysis
self.SymbolTable = SymbolTable()
self.FirstPass = None
self.Next = False
def run(self,firstPass =True):
if(firstPass):
self.Lexical.Run()
else:
print "reset"
self.Lexical.reset();
self.FirstPass = firstPass
self.Compilation_Unit()
def HandleException(self, exception):
traceback.print_exc()
print str(exception)
os._exit(0)
def expression(self):
if(self.Lexical.getToken().lexem == "("):
try:
self.Lexical.GetNextToken()
self.expression()
except Exception as e:
raise e
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ")"):
raise Exception(TossError(self,")"))
self.Lexical.GetNextToken()
try:
self.expressionz()
except Exception as e:
self.HandleException(e)
elif(self.Lexical.getToken().lexem == "true" or self.Lexical.getToken().lexem == "false" or self.Lexical.getToken().lexem == "null" or self.Lexical.getToken().myType == "number" or self.Lexical.getToken().myType == "char" ):
try:
self.Lexical.GetNextToken()
ret = self.expressionz()
except Exception as e:
self.HandleException(e)
elif(self.Lexical.getToken().myType == "Identifier"):
try:
self.Lexical.GetNextToken()
ret = self.fn_arr_member()
if (ret != None):
self.Lexical.GetNextToken()
ret = self.member_refz()
if (ret != None):
self.Lexical.GetNextToken()
ret = self.expressionz()
except Exception as e:
self.HandleException(e)
else:
raise Exception()
def expressionz(self):
token = self.Lexical.getToken()
if(token.lexem == '='):
self.Lexical.GetNextToken()
self.assignment_expression()
elif(token.lexem == "&&" or token.lexem == '||'):
self.Lexical.GetNextToken()
self.expression()
elif(token.lexem == "==" or token.lexem == "!=" or token.lexem == '<=' or token.lexem == '>=' or token.lexem == '<' or token.lexem == '>'):
self.Lexical.GetNextToken()
print "EJG"+ self.Lexical.getToken().lexem
self.expression()
elif(token.myType == 'math'):
self.Lexical.GetNextToken()
self.expression()
return 1
def fn_arr_member(self):
if(self.Lexical.getToken().lexem == "("):
self.Lexical.GetNextToken()
try:
self.argument_list()
except Exception as e:
if e.msg != "NoneExistant":
self.HandleException(e)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ")"):
raise Exception(TossError(self,")"));
return 1
elif( self.Lexical.getToken().lexem == "["):
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
self.HandleException(e)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != "]"):
raise Exception(TossError(self,"]"))
return 1
else:
return None
def member_refz(self):
if(self.Lexical.getToken().lexem != "."):
return
self.Lexical.GetNextToken()
if(self.Lexical.getToken().myType != "Identifier"):
raise Exception(TossError(self,"Identifier"))
try:
self.Lexical.GetNextToken()
ret = self.fn_arr_member()
if( ret != None):
self.Lexical.GetNextToken()
ret = self.member_refz()
if(ret != None):
self.Lexical.GetNextToken()
except Exception as e:
self.HandleException(e)
return 1
def assignment_expression(self):
if self.Lexical.getToken().lexem == 'this':
self.Lexical.GetNextToken()
return
elif self.Lexical.getToken().lexem == 'new':
self.Lexical.GetNextToken()
try:
self.isType()
self.Lexical.GetNextToken()
self.new_declaration()
except Exception as e:
self.HandleException(e)
elif self.Lexical.getToken().lexem == 'atoi':
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != '('):
self.HandleException(TossError(self,'('))
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
self.HandleException(e)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ')'):
self.HandleException(TossError(self,')'))
elif(self.Lexical.getToken().lexem == 'itoa'):
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != '('):
self.HandleException(TossError(self,'('))
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
self.HandleException(e)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ')'):
self.HandleException(TossError(self,')'))
else:
try:
self.expression()
except Exception as e:
raise e
def ClassNameExists(self):
return self.SymbolTable.Exists(self.Lexical.getToken().lexem)
def new_declaration(self):
if(self.Lexical.getToken().lexem == "("):
self.Lexical.GetNextToken()
try:
self.argument_list()
except Exception as e:
self.HandleException(e)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ")"):
raise Exception(TossError(self,")"))
if(self.Lexical.getToken().lexem == "["):
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
self.HandleException(e)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != "]"):
raise Exception(TossError(self,"]"))
def argument_list(self):
try:
self.expression()
except Exception as e:
raise e
while(self.Lexical.Peek.lexem != ","):
self.Lexical.GetNextToken()
try:
self.Lexical.GetNextToken()
self.expression()
except Exception as e:
raise Exception(TossError(self,"Exception"))
def Compilation_Unit(self):
ret = -1
while ret != 0:
try:
ret =self.Class_declaration()
except Exception as e:
self.HandleException(e)
print "Here"
if( self.Lexical.getToken().lexem != "void"):
raise Exception(TossError(self,"void"))
else:
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem == "main"):
if(not self.SymbolTable.Exists("main")):
symid = self.SymbolTable.getSymID("method")
self.SymbolTable.addNode(SymbolNode(self.SymbolTable.getScope(),symid,"main","method",{"Return Type":"void"}))
self.SymbolTable.startScope("main")
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != "("):
raise Exception(TossError(self, '('))
else:
self.Lexical.GetNextToken()
if self.Lexical.getToken().lexem != ')':
raise Exception(TossError(self,')'))
else:
self.Lexical.GetNextToken()
try:
self.method_body()
except Exception as e:
self.HandleException(e)
self.SymbolTable.endScope()
else:
raise Exception(TossError(self,"Main"))
def Class_declaration(self):
if(self.Lexical.getToken().lexem != "class"):
return 0
try:
self.Lexical.GetNextToken()
ret =self.class_name()
if(ret == 0):
raise Exception(TossError(self,"ClassName"))
self.SymbolTable.startScope(self.Lexical.getToken().lexem)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != "{"):
raise Exception(TossError(self,"{"))
except Exception as e:
self.HandleException(e)
self.Lexical.GetNextToken()
count =0
while(True):
try:
self.class_member_declaration()
if(self.Lexical.getToken().lexem == "}"and self.Lexical.Peek().lexem == "void"):
break
self.Lexical.GetNextToken()
except Exception as e:
break
if(self.Lexical.getToken().lexem != "}"):
raise Exception(TossError(self,"}"))
else:
self.Lexical.GetNextToken()
self.SymbolTable.endScope()
def class_name(self):
if(self.Lexical.getToken().myType != "Identifier"):
return 0
if(self.FirstPass):
if (self.SymbolTable.Exists(self.Lexical.getToken().lexem)):
return 1
else:
symId = self.SymbolTable.getSymID("Class")
node = self.Lexical.getToken()
self.SymbolTable.addNode(SymbolNode(self.SymbolTable.getScope(),symId,node.lexem,"Class",None))
return 1
else:
if (self.SymbolTable.Exists(self.Lexical.getToken().lexem)):
return 1
else:
return 0
def class_member_declaration(self):
try:
self.isModifier()
except:
try:
self.constructor_declaration()
return
except Exception as e:
raise Exception()
modifier = self.Lexical.getToken().lexem
self.Lexical.GetNextToken()
method = False
try:
myType =self.isType()
self.Lexical.GetNextToken()
if(self.Lexical.getToken().myType != 'Identifier'):
raise Exception(TossError(self,'Identifier'))
if(not self.SymbolTable.Exists(self.Lexical.getToken().lexem)):
if(self.Lexical.Peek().lexem != "("):
symId = self.SymbolTable.getSymID("Variable")
node = self.Lexical.getToken()
self.SymbolTable.addNode(SymbolNode(self.SymbolTable.getScope(),symId,node.lexem,"ivar", {"Type":myType, "modifier":modifier}))
else:
symId = self.SymbolTable.getSymID("method")
method = True
node = self.Lexical.getToken()
self.SymbolTable.addNode(SymbolNode(self.SymbolTable.getScope(),symId,node.lexem,"method", {"return Type":myType, "modifier":modifier}))
self.SymbolTable.startScope(node.lexem)
self.Lexical.GetNextToken()
self.field_declaration()
if(method):
self.SymbolTable.endScope()
except Exception as e:
self.HandleException(e)
def isType(self):
token = self.Lexical.getToken()
if(self.FirstPass):
if token.myType == 'type':
return token.lexem
else:
ret = self.ClassNameExists()
if(ret == 0):
raise Exception("TESTING")
else:
pass
return None
else:
if token.myType == 'type':
return token.lexem
else:
ret = self.ClassNameExists()
if ret == 0 :
raise Exception(TossError(self,"Type"))
def ClassNameExists(self):
if(self.FirstPass):
return 1
else:
if( self.SymbolTable.ClassExists(self.Lexical.getToken().lexem)):
return 1
else:
return 0
def isModifier(self):
token = self.Lexical.getToken()
print token.lexem
if( token.lexem == "public"):
return
elif(token.lexem == 'private'):
return
else:
raise Exception()
def field_declaration(self):
token = self.Lexical.getToken()
if(token.lexem == '('):
self.Lexical.GetNextToken()
if(self.parameter_list()):
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ')'):
raise Exception(TossError(self,')'))
try:
self.Lexical.GetNextToken()
self.method_body()
except Exception as e:
self.HandleException(e)
else:
if token.lexem == '[':
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ']'):
raise Exception(TossError(self,']'))
self.Lexical.GetNextToken()
elif(token.lexem == '='):
try:
self.Lexical.GetNextToken()
self.assignment_expression()
self.Lexical.GetNextToken()
except Exception as e:
self.HandleException(e)
if(self.Lexical.getToken().lexem != ';'):
raise Exception(TossError(self,';'))
def constructor_declaration(self):
try:
ret = self.SymbolTable.ClassExists(self.Lexical.getToken().lexem)
if(not ret):
raise Exception()
if(not self.FirstPass):
symId = self.SymbolTable.getSymID("method")
token = self.Lexical.getToken()
try:
node = SymbolNode(self.SymbolTable.getScope(),symId,token.lexem,"method",None)
self.SymbolTable.addNode(node)
except Exception as e:
print str(e)
self.SymbolTable.startScope(self.Lexical.getToken().lexem)
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != '('):
raise Exception(TossError(self,'('))
self.Lexical.GetNextToken()
if(self.parameter_list() ):
self.Lexical.GetNextToken()
if (self.Lexical.getToken().lexem != ')'):
raise Exception(TossError(self,')'))
self.Lexical.GetNextToken()
self.method_body()
print self.Lexical.getToken().lexem
self.SymbolTable.endScope()
except Exception as e:
raise e
def method_body(self):
if(self.Lexical.getToken().lexem != '{'):
raise Exception(TossError(self,'{'))
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem == "}"):
return
while(True):
try:
self.variable_declaration()
self.Lexical.GetNextToken()
except Exception as e:
break
while(True):
try:
self.statement()
print "self = %s" % self.Lexical.getToken()
self.Lexical.GetNextToken()
print "self2 = %s" % self.Lexical.getToken()
except:
print "self3 = %s" % self.Lexical.getToken()
break
if(self.Lexical.getToken().lexem != '}'):
raise Exception(TossError(self,'}'))
def variable_declaration(self):
try:
mytype = self.isType()
except Exception as e:
raise e
if(self.Lexical.Peek().myType != 'Identifier'):
raise self.handleException(Exception(TossError(self,'Identifier')))
self.Lexical.GetNextToken()
if(self.Lexical.getToken().myType != 'Identifier'):
self.handleException(Exception(TossError(self,'Identifier')))
if( not self.SymbolTable.Exists(self.Lexical.getToken().lexem)):
symid = self.SymbolTable.getSymID("local")
self.SymbolTable.addNode(SymbolNode(self.SymbolTable.getScope(),symid,self.Lexical.getToken().lexem,"lvar",{"type":mytype}))
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem == '['):
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ']'):
self.HandleException(Exception(TossError(self,']')))
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem == '='):
self.Lexical.GetNextToken()
try:
self.assignment_expression()
except Exception as e:
self.HandleException(e)
if(self.Lexical.getToken().lexem != ';'):
self.HandleException(Exception(TossError(self,';')))
def statement(self):
if(self.Next ):
print self.Lexical.getToken().lexem
if(self.Lexical.getToken().lexem == "{"):
self.Lexical.GetNextToken()
try:
self.statement()
except Exception as e:
raise e
self.Lexical.GetNextToken()
if self.Lexical.getToken().lexem != "}":
raise Exception(TossError(self,"}"))
elif(self.Lexical.getToken().lexem == "if"):
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != "("):
raise Exception(TossError(self,"("))
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
raise e
if self.Lexical.getToken().lexem != ")":
raise Exception(TossError(self,")"))
try:
self.Lexical.GetNextToken()
self.statement()
except Exception as e:
raise e
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem == "else"):
try:
self.Lexical.GetNextToken()
self.statement()
except Exception as e:
raise e
return
elif(self.Lexical.getToken().lexem == "while"):
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != "("):
raise Exception(TossError(self,"("))
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
raise e
if(self.Lexical.getToken().lexem != ")"):
raise Exception(TossError(self,")"))
self.Lexical.GetNextToken()
try:
self.statement()
except Exception as e:
raise e
elif (self.Lexical.getToken().lexem == "return"):
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
raise e
if(self.Lexical.getToken().lexem != ";"):
raise Exception(TossError(self,";"))
elif (self.Lexical.getToken().lexem == "cout"):
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != "<<"):
raise Exception(TossError(self,"<<"))
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
raise e
if(self.Lexical.getToken().lexem != ";"):
raise Exception(TossError(self,";"))
elif self.Lexical.getToken().lexem == "cin":
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ">>"):
raise Exception(TossError(self,">>"))
self.Lexical.GetNextToken()
try:
self.expression()
except Exception as e:
raise e
else:
print 'Here'
try:
print "selfExpre = %s" % self.Lexical.getToken()
ret =self.expression()
print "sele:w1 = %s" % self.Lexical.getToken()
if(self.Lexical.Peek().lexem == "sum"):
print "h123:ere"
self.Next = True
except Exception as e:
print "Raising"
raise e
def parameter_list(self):
if(self.Lexical.getToken().lexem == ")"):
return False
while(True):
try:
self.parameter()
self.Lexical.GetNextToken()
if(self.Lexical.getToken().lexem != ","):
break
self.Lexical.GetNextToken()
except Exception as e:
self.HandleException(e)
return False
def parameter(self):
try:
myType = self.isType()
except:
raise Exception(TossError(self,"Type"))
self.Lexical.GetNextToken()
if(self.Lexical.getToken().myType != "Identifier" ):
raise Exception(TossError(self,"Identifier"))
if(not self.SymbolTable.Exists(self.Lexical.getToken().lexem)):
symid = self.SymbolTable.getSymID("parameter")
node = self.Lexical.getToken()
self.SymbolTable.addNode(SymbolNode(self.SymbolTable.getScope(),symid,node.lexem,"parameter",{"type": myType}))
def printTable(self):
print self.SymbolTable.getScope()
print self.SymbolTable
import SymbolTable
f = open('test.asm')
code = f.readlines()
f.close()
lines = []
for line in code:
lines.append(line[:-1])
symbols = SymbolTable.SymbolTable()
class Parser(object):
def __init__(self, file):
self.lex = Lex(file)
self.symbols = SymbolTable()
self.vm = VMWriter()
self.openout(file)
self.compile_class()
self.closeout()
# VMWriter support
def openout(self, path):
outdir = os.path.join(os.path.dirname(path), 'output')
file = os.path.join(outdir, os.path.basename(path))
try:
os.mkdir(outdir)
except OSError as e:
pass
self.vm.openout(file)
def closeout(self):
self.vm.closeout()
def vm_function_name(self):
return self._cur_class+'.'+self._cur_subroutine
def vm_push_variable(self, name):
(type, kind, index) = self.symbols.lookup(name)
self.vm.write_push(segments[kind], index)
def vm_pop_variable(self, name):
(type, kind, index) = self.symbols.lookup(name)
self.vm.write_pop(segments[kind], index)
# Routines to advance the token
def _require(self, tok, val=None):
lextok, lexval = self._advance()
if tok != lextok or tok in (T_KEYWORD, T_SYM) and val != lexval:
raise ParserError(self._require_failed_msg(tok, val))
else:
return lexval
def _require_failed_msg(self, tok, val):
if val == None: val = tokens[tok]
return 'Expected '+val
def _advance(self):
return self.lex.advance()
def _is_token(self, tok, val=None):
lextok, lexval = self.lex.peek()
return val == None and lextok == tok or (lextok, lexval) == (tok, val)
def _is_keyword(self, *keywords):
lextok, lexval = self.lex.peek()
return lextok == T_KEYWORD and lexval in keywords
def _is_sym(self, symbols):
lextok, lexval = self.lex.peek()
return lextok == T_SYM and lexval in symbols
# Parser and compile Jack code
# class: 'class' className '{' classVarDec* subroutineDec* '}'
def compile_class(self):
self._require(T_KEYWORD, KW_CLASS)
self.compile_class_name()
self._require(T_SYM, '{')
while self._is_class_var_dec():
self.compile_class_var_dec()
while self._is_subroutine():
self.compile_subroutine()
self._require(T_SYM, '}')
# className: identifier
def compile_class_name(self):
self._cur_class = self.compile_var_name() # Class names don't have to go into the symbol table
# Variable declarations
def _is_class_var_dec(self):
return self._is_keyword(KW_STATIC, KW_FIELD)
# classVarDec: {'static'|'field'} type varName (',' varName)* ';'
def compile_class_var_dec(self):
tok, kwd = self._advance() # static | field
self._compile_dec(kwd_to_kind[kwd])
# type varName (',' varName)* ';'
def _compile_dec(self, kind):
type = self.compile_type();
name = self.compile_var_name()
self.symbols.define(name, type, kind)
while self._is_sym(','):
self._advance()
name = self.compile_var_name()
self.symbols.define(name, type, kind)
self._require(T_SYM, ';')
def _is_type(self):
return self._is_token(T_ID) or self._is_keyword(KW_INT, KW_CHAR, KW_BOOLEAN)
# 'void' | type
def compile_void_or_type(self):
if self._is_keyword(KW_VOID):
return self._advance()[1]
else:
return self.compile_type()
# type: 'int' | 'char' | 'boolean' | className
def compile_type(self):
if self._is_type():
return self._advance()[1]
else:
raise ParserError(self._require_failed_msg(*self.lex.peek()))
def _is_var_name(self):
return self._is_token(T_ID)
# varName: identifier
def compile_var_name(self):
return self._require(T_ID)
# Subroutine declarations
def _is_subroutine(self):
return self._is_keyword(KW_CONSTRUCTOR, KW_FUNCTION, KW_METHOD)
# subroutineDec: ('constructor'|'function'|'method') ('void'|type)
# subroutineName '(' parameterList ')' subroutineBody
def compile_subroutine(self):
tok, kwd = self._advance()
type = self.compile_void_or_type()
self.compile_subroutine_name()
self.symbols.start_subroutine()
if kwd == KW_METHOD:
self.symbols.define('this', self._cur_class, SK_ARG)
self._require(T_SYM, '(')
self.compile_parameter_list()
self._require(T_SYM, ')')
self.compile_subroutine_body(kwd)
# subroutineName: identifier
def compile_subroutine_name(self):
self._cur_subroutine = self.compile_var_name() # subroutine names don't have to go in the symbol table
# parameterList: (parameter (',' parameter)*)?
def compile_parameter_list(self):
if self._is_type():
self.compile_parameter()
while self._is_sym(','):
self._advance()
self.compile_parameter()
# parameter: type varName
def compile_parameter(self):
if self._is_type():
type = self.compile_type()
name = self.compile_var_name()
self.symbols.define(name, type, SK_ARG)
# subroutineBody: '{' varDec* statements '}'
def compile_subroutine_body(self, kwd):
self._require(T_SYM, '{')
while self._is_var_dec():
self.compile_var_dec()
self.write_func_decl(kwd)
self.compile_statements()
self._require(T_SYM, '}')
def write_func_decl(self, kwd):
self.vm.write_function(self.vm_function_name(), self.symbols.var_count(SK_VAR))
self.load_this_ptr(kwd)
def load_this_ptr(self, kwd):
if kwd == KW_METHOD:
self.vm.push_arg(0)
self.vm.pop_this_ptr() # set up 'this' pointer to point to new object
elif kwd == KW_CONSTRUCTOR:
self.vm.push_const(self.symbols.var_count(SK_FIELD)) # object size
self.vm.write_call('Memory.alloc', 1)
self.vm.pop_this_ptr() # set up 'this' pointer to point to new object
def _is_var_dec(self):
return self._is_keyword(KW_VAR)
# varDec: 'var' type varName (',' varName)* ';'
def compile_var_dec(self):
self._require(T_KEYWORD, KW_VAR)
return self._compile_dec(SK_VAR)
# Statements
# statement: statement*
def compile_statements(self):
while self._is_statement():
self._compile_statement()
def _is_statement(self):
return self._is_let() or self._is_if() or self._is_while() or self._is_do() or self._is_return()
# statement: letStatement | ifStatement | whileStatement | doStatement | returnStatement
def _compile_statement(self):
if self._is_let(): self.compile_let()
elif self._is_if(): self.compile_if()
elif self._is_while(): self.compile_while()
elif self._is_do(): self.compile_do()
elif self._is_return(): self.compile_return()
def _is_let(self):
return self._is_keyword(KW_LET)
# letStatement: 'let' varName ('[' expression ']')? '=' expression ';'
def compile_let(self):
self._require(T_KEYWORD, KW_LET)
name = self.compile_var_name()
subscript = self._is_sym('[')
if subscript:
self.compile_base_plus_index(name) # calculate base+index
self._require(T_SYM, '=')
self.compile_expression() # calculate expression to assign
self._require(T_SYM, ';')
if subscript:
self.pop_array_element() # *(base+index) = expr
else:
self.vm_pop_variable(name) # pop value directly into variable
# ('[' expression ']')?
def compile_base_plus_index(self, name):
self.vm_push_variable(name) # push array ptr onto stack
self._advance()
self.compile_expression() # push index onto stack
self._require(T_SYM, ']')
self.vm.write_vm_cmd('add') # base+index - leave on the stack for later
def pop_array_element(self):
self.vm.pop_temp(TEMP_ARRAY) # Pop expr value to temp register
self.vm.pop_that_ptr() # Pop base+index into 'that' register
self.vm.push_temp(TEMP_ARRAY) # Push expr back onto stack
self.vm.pop_that() # Pop value into *(base+index)
def _is_if(self):
return self._is_keyword(KW_IF)
# ifStatement: 'if' '(' expression ')' '{' statements '}'
# ('else' '{' statements '}')?
def compile_if(self):
self._require(T_KEYWORD, KW_IF)
end_label = self.new_label()
self._compile_cond_expression_statements(end_label) # VM code for condition and if statements
if self._is_keyword(KW_ELSE):
self._advance()
self._require(T_SYM, '{')
self.compile_statements() # VM code for else statements
self._require(T_SYM, "}")
self.vm.write_label(end_label) # label end_label
def _is_while(self):
return self._is_keyword(KW_WHILE)
# whileStatement: 'while' '(' expression ')' '{' statements '}'
def compile_while(self):
self._require(T_KEYWORD, KW_WHILE)
top_label = self.new_label()
self.vm.write_label(top_label) # label top_label
self._compile_cond_expression_statements(top_label) # VM code for condition and while statements
# '(' expression ')' '{' statements '}'
def _compile_cond_expression_statements(self, label):
self._require(T_SYM, '(')
self.compile_expression()
self._require(T_SYM, ')')
self.vm.write_vm_cmd('not') # ~(cond)
notif_label = self.new_label()
self.vm.write_if(notif_label) # if-goto notif_label
self._require(T_SYM, '{')
self.compile_statements() # VM code for if statements
self._require(T_SYM, '}')
self.vm.write_goto(label) # goto label
self.vm.write_label(notif_label)# label notif_label
label_num = 0
def new_label(self):
self.label_num += 1
return 'label'+str(self.label_num)
def _is_do(self):
return self._is_keyword(KW_DO)
# do_statement: 'do' subroutineCall ';'
def compile_do(self):
self._require(T_KEYWORD, KW_DO)
name = self._require(T_ID)
self.compile_subroutine_call(name) # VM code for subroutine call
self.vm.pop_temp(TEMP_RETURN) # Pop return value and discard
self._require(T_SYM, ';')
def _is_return(self):
return self._is_keyword(KW_RETURN)
# returnStatement: 'return' expression? ';'
def compile_return(self):
self._require(T_KEYWORD, KW_RETURN)
if not self._is_sym(';'):
self.compile_expression() # VM code for return expression if any
else:
self.vm.push_const(0) # push 0 if not returning a value
self._require(T_SYM, ';')
self.vm.write_return() # return
# Expressions
# expression: term (op term)*
def compile_expression(self):
self.compile_term()
# Doesn't handle normal order of operations - just left to right for now
while self._is_op():
op = self._advance()
self.compile_term()
self.vm.write_vm_cmd(vm_cmds[op[1]]) # op
def _is_term(self):
return self._is_const() or self._is_var_name() or self._is_sym('(') or self._is_unary_op()
# term: integerConstant | stringConstant | keywordConstant | varName
# | varName '[' expression ']' | subroutineCall | '(' expression ')'
# | unaryOp term
def compile_term(self):
if self._is_const():
self.compile_const()
elif self._is_sym('('):
self._advance()
self.compile_expression() # VM code to evaluate expression
self._require(T_SYM, ')')
elif self._is_unary_op():
tok, op = self._advance()
self.compile_term()
self.vm.write_vm_cmd(vm_unary_cmds[op]) # op
elif self._is_var_name():
tok, name = self._advance()
if self._is_sym('['):
self.compile_array_subscript(name) # VM code for array subscript
elif self._is_sym('(.'):
self.compile_subroutine_call(name) # VM code for subroutine call
else:
self.vm_push_variable(name) # push variable on stack
def _is_const(self):
return self._is_token(T_NUM) or self._is_token(T_STR) or self._is_keyword_constant()
def _is_keyword_constant(self):
return self._is_keyword(KW_TRUE, KW_FALSE, KW_NULL, KW_THIS)
def _is_op(self):
return self._is_sym('+-*/&|<>=')
def _is_unary_op(self):
return self._is_sym('-~')
# integerConstant | stringConstant | keywordConstant
def compile_const(self):
tok, val = self._advance()
if tok == T_NUM:
self.vm.push_const(val) # push constant val
elif tok == T_STR:
self.write_string_const_init(val) # initialize string & push str addr
elif tok == T_KEYWORD:
self.compile_kwd_const(val) # push TRUE, FALSE, NULL etc.
def write_string_const_init(self, val):
self.vm.push_const(len(val))
self.vm.write_call('String.new', 1) # String.new(len(str))
for c in val:
self.vm.push_const(ord(c))
self.vm.write_call('String.appendChar', 2) # String.appendChar(nextchar)
# keywordConstant: 'true' | 'false' | 'null' | 'this'
def compile_kwd_const(self, kwd):
if kwd == KW_THIS:
self.vm.push_this_ptr()
elif kwd == KW_TRUE:
self.vm.push_const(1)
self.vm.write_vm_cmd('neg')
else: # KW_FALSE or KW_NULL
self.vm.push_const(0)
# '[' expression ']'
def compile_array_subscript(self, name):
self.vm_push_variable(name) # push array ptr onto stack
self._require(T_SYM, '[')
self.compile_expression() # push index onto stack
self._require(T_SYM, ']')
self.vm.write_vm_cmd('add') # base+index
self.vm.pop_that_ptr() # pop into 'that' ptr
self.vm.push_that() # push *(base+index) onto stack
# subroutineCall: subroutineName '(' expressionList ')'
# | (className | varName) '.' subroutineName '(' expressionList ')'
def compile_subroutine_call(self, name):
(type, kind, index) = self.symbols.lookup(name)
if self._is_sym('.'):
num_args, name = self.compile_dotted_subroutine_call(name, type)
else:
num_args = 1
self.vm.push_this_ptr()
name = self._cur_class+'.'+name
self._require(T_SYM, '(')
num_args += self.compile_expr_list() # VM code to push arguments
self._require(T_SYM, ')')
self.vm.write_call(name, num_args) # call name num_args
def compile_dotted_subroutine_call(self, name, type):
num_args = 0
obj_name = name
self._advance()
name = self.compile_var_name()
if self._is_builtin_type(type): # e.g. int.func(123) not allowed
ParserError('Cannot use "." operator on builtin type')
elif type == None: # Calling using class name
name = obj_name+'.'+name
else: # Calling using object variable name
num_args = 1
self.vm_push_variable(obj_name) # push object ptr onto stack
name = self.symbols.type_of(obj_name)+'.'+name
return num_args, name
def _is_builtin_type(self, type):
return type in [KW_INT, KW_CHAR, KW_BOOLEAN, KW_VOID]
# expressionList: (expression (',' expression)*)?
def compile_expr_list(self):
num_args = 0
if self._is_term():
self.compile_expression()
num_args = 1
while self._is_sym(','):
self._advance()
self.compile_expression()
num_args += 1
return num_args
class CompilationEngine:
def __init__(self, files):
self.classes = [file[:-5] for file in files]
self.variables = []
self.counter = {
LOOP_LABEL: 0,
EXIT_LABEL: 0,
IF_LABEL: 0,
ELSE_LABEL: 0
}
def get_label(self, label):
generated_label = label + str(self.counter.get(label))
self.counter[label] += 1
return generated_label
def get_segment(self, var_name):
segment = self.st.kindOf(var_name)
segment_dict = {
VAR_CONSTANT: SEGMENT_LOCAL,
ARG_CONSTANT: SEGMENT_ARGUMENT,
FIELD_CONSTANT: 'this',
STATIC_CONSTANT: SEGMENT_STATIC,
}
return segment_dict.get(segment)
def closeFile(self, file):
self.vm.close()
def hasMoreTokens(self):
return len(self.tokens) > 0
def advance(self):
if(self.hasMoreTokens()):
self.current_token = self.tokens.pop()
return self.current_token
def openXMLFile(self, xml_file):
self.xml_tree = ET.parse(xml_file)
self.tokens = list(self.xml_tree.getroot())
self.tokens.reverse()
self.st = SymbolTable()
self.current_class = xml_file[:-5]
self.vm = VMWriter(self.current_class + '.vm')
def compileClass(self):
self.root = ET.Element('class')
self.advance()
self.advance()
while True:
self.advance()
if self.current_token.text == 'static' or self.current_token.text == 'field':
self.compileClassVarDec()
else:
break
while True:
if self.current_token.text == '}':
break
else:
self.compileSubroutine()
self.advance()
def compileClassVarDec(self):
kind = self.current_token.text
self.advance()
type = self.current_token.text
while True:
self.advance()
if self.current_token.tag == IDENTIFIER:
name = self.current_token.text
self.st.define(name, type, kind)
elif self.current_token.text == ';':
break
# Check if there are more declarations
elif(self.current_token.text == ','):
pass
def compileSubroutine(self):
self.st.startSubroutine()
subroutine_type = self.current_token.text
self.advance()
self.advance()
if subroutine_type == 'method':
self.st.define('this', self.current_class, ARG_CONSTANT)
subroutine_name = self.current_token.text
self.advance() # Skip opening (
self.compileParameterList()
if self.advance().text == '{':
self.compileSubroutineBody(
subroutine_name, subroutine_type)
def compileSubroutineBody(self, subroutine_name, subroutine_type):
while True:
self.advance()
if self.current_token.text == 'var':
self.compileVarDec()
else:
break
self.vm.writeFunction(subroutine_name, self.st.varCount(VAR_CONSTANT))
if subroutine_type == 'constructor': # If constructor allocate memory for obj
object_size = self.st.varCount(FIELD_CONSTANT)
# Push the memory size reqd
# Call Memory.alloc
self.vm.writePush(SEGMENT_CONSTANT, object_size)
self.vm.writeCall('Memory.alloc', 1)
self.vm.writePop(SEGMENT_POINTER, 0) # Setup 'this'
elif subroutine_type == 'method':
self.vm.writePush(SEGMENT_ARGUMENT, 0)
self.vm.writePop(SEGMENT_POINTER, 0) # Setup THIS
self.compileStatements()
def compileType(self):
if self.current_token.text == 'int' or self.current_token.text == 'char' or self.current_token.text == 'boolean':
self.add_sub_element(root, KEYWORD)
return True
elif self.compileClassName(root):
return True
elif self.current_token.text == 'void':
self.add_sub_element(root, KEYWORD)
return True
return False
def compileParameterList(self,):
count_parameters = 0
while True:
self.advance()
if self.current_token.tag == KEYWORD or self.current_token.tag == IDENTIFIER:
type = self.current_token.text
self.advance()
name = self.current_token.text
self.st.define(name, type, ARG_CONSTANT)
count_parameters += 1
elif self.current_token.text == ')':
return count_parameters
elif self.current_token.text == ',':
pass
def compileVarDec(self):
self.advance()
type = self.current_token.text
while True:
self.advance()
if self.current_token.tag == IDENTIFIER:
name = self.current_token.text
self.st.define(name, type, VAR_CONSTANT)
elif self.current_token.text == ',':
pass
elif self.current_token.text == ';':
break
def compileStatements(self):
while True:
if self.current_token.text == 'let':
self.compileLet()
elif self.current_token.text == 'if':
self.compileIf()
elif self.current_token.text == 'while':
self.compileWhile()
elif self.current_token.text == 'do':
self.compileDo()
elif self.current_token.text == 'return':
self.compileReturn()
elif self.current_token.text == '}':
break
self.advance()
def compileDo(self):
self.advance()
self.compileExpression()
self.vm.writePop(SEGMENT_TEMP, 0)
def compileLet(self):
self.advance()
var_name = self.current_token.text
self.advance()
array_flag = False
if self.current_token.text == '[':
self.vm.writePush(self.get_segment(var_name),
self.st.indexOf(var_name))
self.advance()
self.compileExpression()
self.vm.writeArithmetic('add')
self.advance()
array_flag = True
if self.current_token.text == '=':
self.advance()
self.compileExpression()
if self.current_token.text == ';':
if array_flag:
self.vm.writePop(SEGMENT_TEMP, 0)
self.vm.writePop(SEGMENT_POINTER, 1)
self.vm.writePush(SEGMENT_TEMP, 0)
self.vm.writePop(SEGMENT_THAT, 0)
else:
self.vm.writePop(self.get_segment(var_name),
self.st.indexOf(var_name))
def compileWhile(self):
self.advance()
while_label = self.get_label(LOOP_LABEL)
exit_label = self.get_label(EXIT_LABEL)
self.vm.writeLabel(while_label)
self.advance()
self.compileExpression()
self.vm.writeArithmetic('not')
self.vm.writeIf(exit_label)
if self.advance().text == '{':
self.advance() # skip opening {
self.compileStatements()
# Add closing }
self.vm.writeGoto(while_label)
self.vm.writeLabel(exit_label)
def compileReturn(self):
self.advance()
if self.current_token.text != ';':
self.compileExpression()
else:
self.vm.writePush(SEGMENT_CONSTANT, 0)
self.vm.writeReturn()
def compileIf(self):
if_label = self.get_label(IF_LABEL)
else_label = self.get_label(ELSE_LABEL)
self.advance() # Skip if statement
self.advance() # Skip opening (
self.compileExpression()
self.vm.writeArithmetic('not')
self.vm.writeIf(if_label)
self.advance() # Skip closing )
self.advance() # Skip opening {
self.compileStatements()
self.vm.writeGoto(else_label)
self.vm.writeLabel(if_label)
if self.tokens[-1].text == 'else':
# Skip closing }
self.advance()
self.advance() # Skip else statement
self.advance() # Skip opening {
self.compileStatements()
self.vm.writeLabel(else_label)
def compileExpression(self):
self.compileTerm()
self.advance()
while self.current_token.text in '+-*/&|<>=':
operator = self.current_token
self.advance()
self.compileTerm()
self.tokens.append(operator)
self.advance()
self.compileOp()
self.advance()
def compileOp(self):
if (self.current_token.text == '+'):
self.vm.writeArithmetic('add')
elif (self.current_token.text == '-'):
self.vm.writeArithmetic('sub')
elif (self.current_token.text == '*'):
self.vm.writeCall('Math.multiply', 2)
elif (self.current_token.text == '/'):
self.vm.writeCall('Math.divide', 2)
elif (self.current_token.text == '&'):
self.vm.writeArithmetic('and')
elif (self.current_token.text == '|'):
self.vm.writeArithmetic('or')
elif (self.current_token.text == '<'):
self.vm.writeArithmetic('lt')
elif (self.current_token.text == '>'):
self.vm.writeArithmetic('gt')
elif (self.current_token.text == '='):
self.vm.writeArithmetic('eq')
def compileClassName(self, root):
if self.current_token.text in self.classes:
return True
return False
def compileTerm(self):
if self.current_token.tag == INTEGER: # Integer Constant
self.vm.writePush(SEGMENT_CONSTANT, int(self.current_token.text))
return True
elif self.current_token.tag == STRING: # String Constant
string = self.current_token.text
self.vm.writePush(SEGMENT_CONSTANT, len(string))
self.vm.writeCall('String.new', 1)
for c in string:
self.vm.writePush(SEGMENT_CONSTANT, ord(c))
self.vm.writeCall('String.appendChar', 2)
return True
elif self.current_token.text == 'true': # Keyword Constant
self.vm.writePush(SEGMENT_CONSTANT, 1)
self.vm.writeArithmetic('neg')
return True
elif self.current_token.text == 'false':
self.vm.writePush(SEGMENT_CONSTANT, 0)
return True
elif self.current_token.text == 'null':
self.vm.writePush(SEGMENT_CONSTANT, 0)
return True
elif self.current_token.text == 'this':
self.vm.writePush(SEGMENT_POINTER, 0)
return True
elif self.current_token.tag == IDENTIFIER: # var Name
if self.tokens[-1].text == '[':
var_name = self.current_token.text
self.vm.writePush(self.get_segment(var_name),
self.st.indexOf(var_name))
self.advance()
self.advance()
self.compileExpression()
self.vm.writeArithmetic('add')
self.vm.writePop(SEGMENT_POINTER, 1)
self.vm.writePush(SEGMENT_THAT, 0)
elif self.tokens[-1].text == '.':
call_function = self.current_token.text
nArgs = 0
# Method Call, push obj as first arg
if self.st.kindOf(call_function) is not None:
self.vm.writePush(self.get_segment(
call_function), self.st.indexOf(call_function))
nArgs = 1 # Obj is first argument
call_function = self.st.typeOf(call_function)
self.advance()
self.advance()
call_function += '.' + self.current_token.text
self.advance()
self.advance() # Skip opening (
if self.current_token.text != ')':
nArgs += self.compileExpressionList()
self.vm.writeCall(call_function, nArgs)
elif self.tokens[-1].text == '(':
call_function = self.current_class + '.' + self.current_token.text
self.advance()
self.advance() # Skip opening (
nArgs = 1
self.vm.writePush(SEGMENT_POINTER, 0)
if self.current_token.text != ')':
nArgs += self.compileExpressionList()
self.vm.writeCall(call_function, nArgs)
else: # Regular Variable Name
var_name = self.current_token.text
self.vm.writePush(self.get_segment(var_name),
self.st.indexOf(var_name))
elif self.current_token.text == '-': # unaryOp
self.advance()
self.compileTerm()
self.vm.writeArithmetic('neg')
elif self.current_token.text == '~':
self.advance()
self.compileTerm()
self.vm.writeArithmetic('not')
# Recurse call expression
elif self.current_token.text == '(':
self.advance()
self.compileExpression()
def compileExpressionList(self):
count_expressions = 1
while True:
self.compileExpression()
if self.current_token.text == ',':
self.advance()
count_expressions += 1
else:
return count_expressions
def __init__(self):
self.table = SymbolTable(None, 'Program')
self.a = AllowedOperations()
self.in_loop = 0
class Parser(object):
def __init__(self, file):
self.lex = Lex(file)
self.symbols = SymbolTable()
self.vm = VMWriter()
self.openout(file)
self.compile_class()
self.closeout()
# VMWriter support
def openout(self, path):
outdir = os.path.join(os.path.dirname(path), "output")
file = os.path.join(outdir, os.path.basename(path))
try:
os.mkdir(outdir)
except OSError as e:
pass
self.vm.openout(file)
def closeout(self):
self.vm.closeout()
def vm_function_name(self):
return self._cur_class + "." + self._cur_subroutine
def vm_push_variable(self, name):
(type, kind, index) = self.symbols.lookup(name)
self.vm.write_push(segments[kind], index)
def vm_pop_variable(self, name):
(type, kind, index) = self.symbols.lookup(name)
self.vm.write_pop(segments[kind], index)
# Routines to advance the token
def _require(self, tok, val=None):
lextok, lexval = self._advance()
if tok != lextok or tok in (T_KEYWORD, T_SYM) and val != lexval:
raise ParserError(self._require_failed_msg(tok, val))
else:
return lexval
def _require_failed_msg(self, tok, val):
if val == None:
val = tokens[tok]
return "Expected " + val
def _advance(self):
return self.lex.advance()
def _is_token(self, tok, val=None):
lextok, lexval = self.lex.peek()
return val == None and lextok == tok or (lextok, lexval) == (tok, val)
def _is_keyword(self, *keywords):
lextok, lexval = self.lex.peek()
return lextok == T_KEYWORD and lexval in keywords
def _is_sym(self, symbols):
lextok, lexval = self.lex.peek()
return lextok == T_SYM and lexval in symbols
# Parser and compile Jack code
# class: 'class' className '{' classVarDec* subroutineDec* '}'
def compile_class(self):
self._require(T_KEYWORD, KW_CLASS)
self.compile_class_name()
self._require(T_SYM, "{")
while self._is_class_var_dec():
self.compile_class_var_dec()
while self._is_subroutine():
self.compile_subroutine()
self._require(T_SYM, "}")
# className: identifier
def compile_class_name(self):
self._cur_class = self.compile_var_name() # Class names don't have to go into the symbol table
# Variable declarations
def _is_class_var_dec(self):
return self._is_keyword(KW_STATIC, KW_FIELD)
# classVarDec: {'static'|'field'} type varName (',' varName)* ';'
def compile_class_var_dec(self):
tok, kwd = self._advance() # static | field
self._compile_dec(kwd_to_kind[kwd])
# type varName (',' varName)* ';'
def _compile_dec(self, kind):
type = self.compile_type()
name = self.compile_var_name()
self.symbols.define(name, type, kind)
while self._is_sym(","):
self._advance()
name = self.compile_var_name()
self.symbols.define(name, type, kind)
self._require(T_SYM, ";")
def _is_type(self):
return self._is_token(T_ID) or self._is_keyword(KW_INT, KW_CHAR, KW_BOOLEAN)
# 'void' | type
def compile_void_or_type(self):
if self._is_keyword(KW_VOID):
return self._advance()[1]
else:
return self.compile_type()
# type: 'int' | 'char' | 'boolean' | className
def compile_type(self):
if self._is_type():
return self._advance()[1]
else:
raise ParserError(self._require_failed_msg(*self.lex.peek()))
def _is_var_name(self):
return self._is_token(T_ID)
# varName: identifier
def compile_var_name(self):
return self._require(T_ID)
# Subroutine declarations
def _is_subroutine(self):
return self._is_keyword(KW_CONSTRUCTOR, KW_FUNCTION, KW_METHOD)
# subroutineDec: ('constructor'|'function'|'method') ('void'|type)
# subroutineName '(' parameterList ')' subroutineBody
def compile_subroutine(self):
tok, kwd = self._advance()
type = self.compile_void_or_type()
self.compile_subroutine_name()
self.symbols.start_subroutine()
if kwd == KW_METHOD:
self.symbols.define("this", self._cur_class, SK_ARG)
self._require(T_SYM, "(")
self.compile_parameter_list()
self._require(T_SYM, ")")
self.compile_subroutine_body(kwd)
# subroutineName: identifier
def compile_subroutine_name(self):
self._cur_subroutine = self.compile_var_name() # subroutine names don't have to go in the symbol table
# parameterList: (parameter (',' parameter)*)?
def compile_parameter_list(self):
if self._is_type():
self.compile_parameter()
while self._is_sym(","):
self._advance()
self.compile_parameter()
# parameter: type varName
def compile_parameter(self):
if self._is_type():
type = self.compile_type()
name = self.compile_var_name()
self.symbols.define(name, type, SK_ARG)
# subroutineBody: '{' varDec* statements '}'
def compile_subroutine_body(self, kwd):
self._require(T_SYM, "{")
while self._is_var_dec():
self.compile_var_dec()
self.write_func_decl(kwd)
self.compile_statements()
self._require(T_SYM, "}")
def write_func_decl(self, kwd):
self.vm.write_function(self.vm_function_name(), self.symbols.var_count(SK_VAR))
self.load_this_ptr(kwd)
def load_this_ptr(self, kwd):
if kwd == KW_METHOD:
self.vm.push_arg(0)
self.vm.pop_this_ptr() # set up 'this' pointer to point to new object
elif kwd == KW_CONSTRUCTOR:
self.vm.push_const(self.symbols.var_count(SK_FIELD)) # object size
self.vm.write_call("Memory.alloc", 1)
self.vm.pop_this_ptr() # set up 'this' pointer to point to new object
def _is_var_dec(self):
return self._is_keyword(KW_VAR)
# varDec: 'var' type varName (',' varName)* ';'
def compile_var_dec(self):
self._require(T_KEYWORD, KW_VAR)
return self._compile_dec(SK_VAR)
# Statements
# statement: statement*
def compile_statements(self):
while self._is_statement():
self._compile_statement()
def _is_statement(self):
return self._is_let() or self._is_if() or self._is_while() or self._is_do() or self._is_return()
# statement: letStatement | ifStatement | whileStatement | doStatement | returnStatement
def _compile_statement(self):
if self._is_let():
self.compile_let()
elif self._is_if():
self.compile_if()
elif self._is_while():
self.compile_while()
elif self._is_do():
self.compile_do()
elif self._is_return():
self.compile_return()
def _is_let(self):
return self._is_keyword(KW_LET)
# letStatement: 'let' varName ('[' expression ']')? '=' expression ';'
def compile_let(self):
self._require(T_KEYWORD, KW_LET)
name = self.compile_var_name()
subscript = self._is_sym("[")
if subscript:
self.compile_base_plus_index(name) # calculate base+index
self._require(T_SYM, "=")
self.compile_expression() # calculate expression to assign
self._require(T_SYM, ";")
if subscript:
self.pop_array_element() # *(base+index) = expr
else:
self.vm_pop_variable(name) # pop value directly into variable
# ('[' expression ']')?
def compile_base_plus_index(self, name):
self.vm_push_variable(name) # push array ptr onto stack
self._advance()
self.compile_expression() # push index onto stack
self._require(T_SYM, "]")
self.vm.write_vm_cmd("add") # base+index - leave on the stack for later
def pop_array_element(self):
self.vm.pop_temp(TEMP_ARRAY) # Pop expr value to temp register
self.vm.pop_that_ptr() # Pop base+index into 'that' register
self.vm.push_temp(TEMP_ARRAY) # Push expr back onto stack
self.vm.pop_that() # Pop value into *(base+index)
def _is_if(self):
return self._is_keyword(KW_IF)
# ifStatement: 'if' '(' expression ')' '{' statements '}'
# ('else' '{' statements '}')?
def compile_if(self):
self._require(T_KEYWORD, KW_IF)
end_label = self.new_label()
self._compile_cond_expression_statements(end_label) # VM code for condition and if statements
if self._is_keyword(KW_ELSE):
self._advance()
self._require(T_SYM, "{")
self.compile_statements() # VM code for else statements
self._require(T_SYM, "}")
self.vm.write_label(end_label) # label end_label
def _is_while(self):
return self._is_keyword(KW_WHILE)
# whileStatement: 'while' '(' expression ')' '{' statements '}'
def compile_while(self):
self._require(T_KEYWORD, KW_WHILE)
top_label = self.new_label()
self.vm.write_label(top_label) # label top_label
self._compile_cond_expression_statements(top_label) # VM code for condition and while statements
# '(' expression ')' '{' statements '}'
def _compile_cond_expression_statements(self, label):
self._require(T_SYM, "(")
self.compile_expression()
self._require(T_SYM, ")")
self.vm.write_vm_cmd("not") # ~(cond)
notif_label = self.new_label()
self.vm.write_if(notif_label) # if-goto notif_label
self._require(T_SYM, "{")
self.compile_statements() # VM code for if statements
self._require(T_SYM, "}")
self.vm.write_goto(label) # goto label
self.vm.write_label(notif_label) # label notif_label
label_num = 0
def new_label(self):
self.label_num += 1
return "label" + str(self.label_num)
def _is_do(self):
return self._is_keyword(KW_DO)
# do_statement: 'do' subroutineCall ';'
def compile_do(self):
self._require(T_KEYWORD, KW_DO)
name = self._require(T_ID)
self.compile_subroutine_call(name) # VM code for subroutine call
self.vm.pop_temp(TEMP_RETURN) # Pop return value and discard
self._require(T_SYM, ";")
def _is_return(self):
return self._is_keyword(KW_RETURN)
# returnStatement: 'return' expression? ';'
def compile_return(self):
self._require(T_KEYWORD, KW_RETURN)
if not self._is_sym(";"):
self.compile_expression() # VM code for return expression if any
else:
self.vm.push_const(0) # push 0 if not returning a value
self._require(T_SYM, ";")
self.vm.write_return() # return
# Expressions
# expression: term (op term)*
def compile_expression(self):
self.compile_term()
# Doesn't handle normal order of operations - just left to right for now
while self._is_op():
op = self._advance()
self.compile_term()
self.vm.write_vm_cmd(vm_cmds[op[1]]) # op
def _is_term(self):
return self._is_const() or self._is_var_name() or self._is_sym("(") or self._is_unary_op()
# term: integerConstant | stringConstant | keywordConstant | varName
# | varName '[' expression ']' | subroutineCall | '(' expression ')'
# | unaryOp term
def compile_term(self):
if self._is_const():
self.compile_const()
elif self._is_sym("("):
self._advance()
self.compile_expression() # VM code to evaluate expression
self._require(T_SYM, ")")
elif self._is_unary_op():
tok, op = self._advance()
self.compile_term()
self.vm.write_vm_cmd(vm_unary_cmds[op]) # op
elif self._is_var_name():
tok, name = self._advance()
if self._is_sym("["):
self.compile_array_subscript(name) # VM code for array subscript
elif self._is_sym("(."):
self.compile_subroutine_call(name) # VM code for subroutine call
else:
self.vm_push_variable(name) # push variable on stack
def _is_const(self):
return self._is_token(T_NUM) or self._is_token(T_STR) or self._is_keyword_constant()
def _is_keyword_constant(self):
return self._is_keyword(KW_TRUE, KW_FALSE, KW_NULL, KW_THIS)
def _is_op(self):
return self._is_sym("+-*/&|<>=")
def _is_unary_op(self):
return self._is_sym("-~")
# integerConstant | stringConstant | keywordConstant
def compile_const(self):
tok, val = self._advance()
if tok == T_NUM:
self.vm.push_const(val) # push constant val
elif tok == T_STR:
self.write_string_const_init(val) # initialize string & push str addr
elif tok == T_KEYWORD:
self.compile_kwd_const(val) # push TRUE, FALSE, NULL etc.
def write_string_const_init(self, val):
self.vm.push_const(len(val))
self.vm.write_call("String.new", 1) # String.new(len(str))
for c in val:
self.vm.push_const(ord(c))
self.vm.write_call("String.appendChar", 2) # String.appendChar(nextchar)
# keywordConstant: 'true' | 'false' | 'null' | 'this'
def compile_kwd_const(self, kwd):
if kwd == KW_THIS:
self.vm.push_this_ptr()
elif kwd == KW_TRUE:
self.vm.push_const(1)
self.vm.write_vm_cmd("neg")
else: # KW_FALSE or KW_NULL
self.vm.push_const(0)
# '[' expression ']'
def compile_array_subscript(self, name):
self.vm_push_variable(name) # push array ptr onto stack
self._require(T_SYM, "[")
self.compile_expression() # push index onto stack
self._require(T_SYM, "]")
self.vm.write_vm_cmd("add") # base+index
self.vm.pop_that_ptr() # pop into 'that' ptr
self.vm.push_that() # push *(base+index) onto stack
# subroutineCall: subroutineName '(' expressionList ')'
# | (className | varName) '.' subroutineName '(' expressionList ')'
def compile_subroutine_call(self, name):
(type, kind, index) = self.symbols.lookup(name)
if self._is_sym("."):
num_args, name = self.compile_dotted_subroutine_call(name, type)
else:
num_args = 1
self.vm.push_this_ptr()
name = self._cur_class + "." + name
self._require(T_SYM, "(")
num_args += self.compile_expr_list() # VM code to push arguments
self._require(T_SYM, ")")
self.vm.write_call(name, num_args) # call name num_args
def compile_dotted_subroutine_call(self, name, type):
num_args = 0
obj_name = name
self._advance()
name = self.compile_var_name()
if self._is_builtin_type(type): # e.g. int.func(123) not allowed
ParserError('Cannot use "." operator on builtin type')
elif type == None: # Calling using class name
name = obj_name + "." + name
else: # Calling using object variable name
num_args = 1
self.vm_push_variable(obj_name) # push object ptr onto stack
name = self.symbols.type_of(obj_name) + "." + name
return num_args, name
def _is_builtin_type(self, type):
return type in [KW_INT, KW_CHAR, KW_BOOLEAN, KW_VOID]
# expressionList: (expression (',' expression)*)?
def compile_expr_list(self):
num_args = 0
if self._is_term():
self.compile_expression()
num_args = 1
while self._is_sym(","):
self._advance()
self.compile_expression()
num_args += 1
return num_args
def __init__(self):
self.symbols = SymbolTable.SymbolTable()
self.symbol_addr = 16
class Assembler(object):
##########################################
#Constructor
def __init__(self, target):
index = target.find('.asm')
if (index < 1):
raise RuntimeError("error, cannot use the filename: " + target)
self.inputFileName = target
self.outputFileName = self.inputFileName[:index] + '.hack'
self.parser = Parser(self.inputFileName)
self.code = Code()
self.st = SymbolTable()
##########################################
#public methods
def assemble(self):
'''Does the assembly and creates the file of machine commands,
returning the name of that file '''
self.__firstPass__()
return self.__output__(self.__secondPass__())
##########################################
#private/local methods
def __output__(self, codeList):
''' outpute the machine code codeList into a file and returns the filename'''
file = open(self.outputFileName, "w")
file.write("\n".join(codeList))
file.close()
return self.outputFileName
def __firstPass__(self):
''' Passes over the file contents to populate the symbol table'''
#MUST prevent the Assembler reaching into the parser
#while also not requiring the parser to become semantically aware
#so let parser do mechanical work
# and let Assembler do the semantic part on the returned results
#TODO complete this function
#update the symbol table with the processLabels dict
self.st.table.update(self.parser.processLabels())
def __secondPass__(self):
''' Manage the translation to machine code, returning a list of machine instructions'''
machineCode = []
command = self.parser.advance()
while (command):
if (True):
#TODO complete this loop body
if self.parser.commandType(command) == Parser.C_COMMAND:
bitString = self.__assembleC__(
command) #translate C command
result = bitString
elif self.parser.commandType(command) == Parser.A_COMMAND:
if self.st.contains(command[1:]):
bitString = self.__assembleA__(
command) #if A command in table, process
elif self.parser.symbol(command).isdigit():
bitString = self.__assembleA__(
command[1:]) #if A command is digit, process
else:
self.st.addEntry(command[1:],
self.st.getNextVariableAddress())
bitString = self.__assembleA__(
command
) #if A command is new variable, add it to table and process
result = bitString
machineCode.append(result)
else:
symStr = self.parser.symbol()
raise RuntimeError(
'There should be no labels on second pass, errant symbol is '
+ symStr)
command = self.parser.advance()
return machineCode
def __assembleC__(self, command):
''' Do the mechanical work to translate a C_COMMAND, returns a string representation
of a 16-bit binary word.'''
#TODO complete this function
return '111' + self.code.comp(
self.parser.comp(command)) + self.code.dest(
self.parser.dest(command)) + self.code.jump(
self.parser.jump(command))
pass
def __assembleA__(self, command):
''' Do the mechanical work to translate an A_COMMAND, returns a string representation
of a 16-bit binary word.'''
#TODO complete this function
if command.isdigit():
symVal = command
result = '0' + "{0:015b}".format(int(symVal)) #translate the digit
else:
symVal = self.st.getAddress(self.parser.symbol(command))
result = '0' + "{0:015b}".format(
symVal) #translate the address from symbol table
return result
def __init__(self, name):
super().__init__("ATOMIC_CONCEPT")
self.name = name
SymbolTable().add_to_table(self.name)
def __init__(self):
self.symbol_table = SymbolTable.SymbolTable()
# store variable values starting at index 16.
self.var_addr_count = 16
import Parser import Code import SymbolTable as st from sys import argv st.Constructor() f = open(argv[1]) lines = f.readlines() symbol_count = 0 cmd_count = 0 bin_output = '' # loop 1, check and build jump table for l in lines: cleaned_str = Parser.clean(l) cmd_type = Parser.commandType(cleaned_str) if cmd_type == Parser.A_COMMAND: cmd_count = cmd_count + 1 if cmd_type == Parser.C_COMMAND: cmd_count = cmd_count + 1 if cmd_type == Parser.L_COMMAND: symbol = cleaned_str[1:-1] st.addEntry(symbol, cmd_count) for l in lines: cleaned_str = Parser.clean(l) cmd_type = Parser.commandType(cleaned_str) # A command
def __init__(self):
self.table = SymbolTable(None, "root")
self.currentType = ""
self.currentFun = None
self.isInLoop = False
class TypeChecker(NodeVisitor):
def __init__(self):
self.table = SymbolTable(None, "root")
self.currentType = ""
self.currentFun = None
self.isInLoop = False
def visit_Integer(self, node):
return 'int'
def visit_Float(self, node):
return 'float'
def visit_String(self, node):
return 'string'
def visit_Variable(self, node):
definition = self.table.getGlobal(node.id)
if definition is None:
print("Error: Usage of undeclared variable '{}': line {}".format(node.id, node.line))
else:
return definition.type
def visit_Declaration(self, node):
self.currentType = node.type
self.visit(node.inits)
self.currentType = ""
def visit_Init(self, node):
exprType = self.visit(node.expression)
if (self.currentType == exprType) or (self.currentType == "int" and exprType == "float") or (self.currentType == "float" and exprType == "int"):
if self.table.get(node.id) is not None:
print("Error: Variable '{}' already declared: line {}".format(node.id, node.line))
else:
self.table.put(node.id, VariableSymbol(node.id, self.currentType))
else:
print("Error: Assignment of '{}' to '{}': line {}".format(exprType, self.currentType, node.line))
def visit_FunDef(self, node):
if self.table.get(node.id) is not None:
print("Error: Redefinition of function '{}': line {}".format(node.id, node.line))
else:
function = FunctionSymbol(node.type, node.id, SymbolTable(self.table, node.id))
self.table.put(node.id, function)
self.table = function.symbolTable
self.currentFun = function
if node.args is not None:
self.visit(node.args)
function.extractParams()
self.visit(node.body)
self.table = self.table.getParentScope()
self.currentFun = None
def visit_Arg(self, node):
if self.table.get(node.id) is not None:
print("Error: Variable '{}' already declared: line {}".format(node.id, node.line))
else:
self.table.put(node.id, VariableSymbol(node.id, node.type))
def visit_Assignment(self, node):
declaration = self.table.getGlobal(node.id)
exprType = self.visit(node.expression)
if declaration is None:
print("Error: Variable '{}' undefined in current scope: line {}".format(node.id, node.line))
elif declaration.type == "int" and exprType == "float":
print("Warning: Assignment of '{}' to '{}' may cause loss of precision: line {}".format(exprType, declaration.type, node.line))
elif declaration.type == "float" and exprType == "int":
pass
elif exprType != declaration.type:
print("Error: Assignment of '{}' to '{}': line {}". format(exprType, declaration.type, node.line))
def visit_InstructionPrint(self, node):
self.visit(node.expression)
def visit_InstructionIf(self, node):
self.visit(node.condition)
self.visit(node.instructionIf)
if node.instructionElse is not None:
self.visit(node.instructionElse)
def visit_InstructionWhile(self, node):
self.visit(node.condition)
self.isInLoop = True
self.visit(node.instruction)
self.isInLoop = False
def visit_Repeat(self, node):
self.isInLoop = True
self.visit(node.instructions)
self.isInLoop = False
self.visit(node.condition)
def visit_Return(self, node):
if self.currentFun is None:
print("Error: return instruction outside a function: line {}".format(node.line))
else:
retType = self.visit(node.expression)
if retType != self.currentFun.type and (self.currentFun.type != "float" or retType != "int"):
print("Error: Improper returned type, expected {}, got {}: line {}".format(self.currentFun.type, retType, node.line))
def visit_Continue(self, node):
if not self.isInLoop:
print("Error: continue instruction outside a loop: line {}".format(node.line))
def visit_Break(self, node):
if not self.isInLoop:
print("Error: break instruction outside a loop: line {}".format(node.line))
def visit_CompoundInstruction(self, node):
innerScope = SymbolTable(self.table, "innerScope")
self.table = innerScope
if node.declarations is not None:
self.visit(node.declarations)
self.visit(node.instructions)
self.table = self.table.getParentScope()
def visit_Expression(self):
pass
def visit_BinExpr(self, node):
type1 = self.visit(node.left)
type2 = self.visit(node.right)
op = node.op;
if ttype[op][type1][type2] is None:
print("Error: Illegal operation, '{} {} {}': line {}".format(type1, op, type2, node.line))
return ttype[op][type1][type2]
def visit_FunCall(self, node):
funDef = self.table.getGlobal(node.id)
if funDef is None or not isinstance(funDef, FunctionSymbol):
print("Error: Call of undefined fun: '{}': line {}".format(node.id, node.line))
else:
if len(node.arglist.children) != len(funDef.params):
print("Error: Improper number of args in '{}' call: line {}".format(funDef.id, node.line))
else:
types = [self.visit(x) for x in node.arglist.children]
expectedTypes = funDef.params
for actual, expected in zip(types, expectedTypes):
if actual != expected and not (actual == "int" and expected == "float"):
print("Error: Improper type of args in {} call: line {}".format(node.id, node.line))
return funDef.type
def Start():
Display("Start", _list)
global _max_symbol
_max_symbol = 256
if not SymbolTable._initilized : SymbolTable.initilize(0, 32)
SymbolTable.newScope()
def pass1(self):
token_index = 0
for line in self.line_list:
if "START" in line:
self.program_number = 0
self.locctr = 0
token_index = 0
self.sym_tab_list.append(SymbolTable.SymbolTable())
self.literal_tab_list.append(SymbolTable.SymbolTable())
self.external_tab_list.append(SymbolTable.SymbolTable())
self.modif_tab_list.append(SymbolTable.SymbolTable())
self.token_tab_list.append(TokenTable.TokenTable())
self.token_tab_list[self.program_number].set_table(
self.sym_tab_list[self.program_number],
self.literal_tab_list[self.program_number],
self.external_tab_list[self.program_number],
self.inst_table)
elif "CSECT" in line:
self.program_number += 1
self.locctr = 0
token_index = 0
self.sym_tab_list.append(SymbolTable.SymbolTable())
self.literal_tab_list.append(SymbolTable.SymbolTable())
self.external_tab_list.append(SymbolTable.SymbolTable())
self.modif_tab_list.append(SymbolTable.SymbolTable())
self.token_tab_list.append(TokenTable.TokenTable())
self.token_tab_list[self.program_number].set_table(
self.sym_tab_list[self.program_number],
self.literal_tab_list[self.program_number],
self.external_tab_list[self.program_number],
self.inst_table)
self.token_tab_list[self.program_number].put_token(line)
current_token = self.token_tab_list[self.program_number].get_token(
token_index)
if (not eq(current_token.label, "")) and (not eq(
current_token.label, ".")):
if eq(current_token.operator, "EQU"):
self.sym_tab_list[self.program_number].put_symbol(
current_token.label,
self.operate_address(current_token.operand[0]))
else:
self.sym_tab_list[self.program_number].put_symbol(
current_token.label, self.locctr)
if (not eq(current_token.label,
"")) and ("=" in current_token.operand[0]):
self.literal_tab_list[self.program_number].put_symbol(
current_token.operand[0], 0)
if not eq(current_token.operator, ""):
if eq(current_token.operator, "LTORG") or eq(
current_token.operator, "END"):
for j in range(
0, self.literal_tab_list[
self.program_number].get_size()):
literal = self.literal_tab_list[
self.program_number].get_symbol(j)
self.literal_tab_list[
self.program_number].modif_symbol(
literal, self.locctr)
if "X" in literal:
self.locctr += 1
elif "C" in literal:
literal = literal.replace("C", "")
literal = literal.replace("\'", "")
self.locctr += len(literal)
elif eq(current_token.operator, "EXTREF"):
for j in range(0, len(current_token.operand)):
self.external_tab_list[self.program_number].put_symbol(
current_token.operand[j], 0)
elif len(current_token.operand) > 0:
for j in range(
0, self.external_tab_list[
self.program_number].get_size()):
if self.external_tab_list[
self.program_number].get_symbol(
j) in current_token.operand[0]:
modif_size = 6
if "+" in current_token.operator:
modif_size = 5
if "-" in current_token.operand[0]:
op_symbols = current_token.operand[0].split(
"-")
self.modif_tab_list[
self.program_number].put_modif_symbol(
"+" + op_symbols[0],
self.locctr + (6 - modif_size),
modif_size)
self.modif_tab_list[
self.program_number].put_modif_symbol(
"-" + op_symbols[1],
self.locctr + (6 - modif_size),
modif_size)
else:
self.modif_tab_list[
self.program_number].put_modif_symbol(
"+" + current_token.operand[0],
self.locctr + (6 - modif_size),
modif_size)
break
self.locctr += current_token.byte_size
token_index += 1
def Declaration_(instruction, ts, textEdit):
#print(str(instruction))
try:
global la, co, contador
la = instruction.line
co = instruction.column
val = valueExpression(instruction.val, ts, textEdit)
if val == '#':
seob = seOb(
f'Error Semantico: No se pudo declarar {instruction.id}.',
instruction.line, instruction.column)
semanticErrorList.append(seob)
return
if val != 'array':
type_ = getType(val)
sym = TS.Symbol(instruction.id, type_, val, currentAmbit)
if isinstance(instruction.val, ReferenceBit):
if isinstance(instruction.val.expression, Identifier):
sym.referencia = instruction.val.expression.id
#elif isinstance(instruction.val.expression, IdentifierArray):
#sym.referencia = instruction.val.expression.id
if ts.exist(instruction.id) != 1:
ts.add(sym)
else:
ts.update(sym)
if sym.id[1] == 'a': #params, update label to procediment
currentParams.append(sym.id)
ts.updateFunction(currentAmbit, TS.TypeData.PROCEDIMIENTO)
elif sym.id[1] == 'v':
#update label to function
ts.updateFunction(currentAmbit, TS.TypeData.FUNCION)
else:
#print(instruction.id)
valor = {}
if ts.exist(instruction.id) == 1:
valor = ts.get(instruction.id).valor
if isinstance(instruction.val, ExpressionsDeclarationArray):
valor = valueArray(instruction.id, instruction.val, ts, valor,
textEdit)
if isinstance(valor, str):
type_ = TS.TypeData.STRING
listaKeys = []
else:
type_ = TS.TypeData.ARRAY
listaKeys = valor.values()
sym = TS.Symbol(instruction.id, type_, valor, currentAmbit, 0,
len(listaKeys))
#valueArray(sym, instruction.val, ts,textEdit)
if ts.exist(instruction.id) != 1:
ts.add(sym)
else:
ts.update(sym)
#print("var " + str(sym.id) + ": "+str(ts.get(instruction.id).valor))
#validar las referencias
UpdateReferences(instruction.id, val, ts)
except:
print("error en la declaracion de variable")
def process(instructions, ts, printList, textEdit):
global currentAmbit, pasadas, currentParams, contador
try:
i = 0
while i < len(instructions):
#isinstance verificar tipos
b = instructions[i]
if isinstance(b, Print_):
Print(b, ts, printList, textEdit)
elif isinstance(b, Declaration):
Declaration_(b, ts, textEdit)
elif isinstance(b, If):
result = valueExpression(b.expression, ts, textEdit)
if result == 1:
tmp = i
i = goto(i + 1, instructions, b.label)
if i != 0:
pasadas = 0
#print("realizando salto a: "+ str(b.label))
else:
i = tmp
#print("error semantico, etiqueta no existe")
se = seOb(f"Error: etiqueta {b.label} no existe",
b.line, b.column)
semanticErrorList.append(se)
elif result == '#':
se = seOb(f"Error: Condicion no valida", b.line, b.column)
semanticErrorList.append(se)
elif isinstance(b, Goto):
#seteamos la instruccion anterior como la llamada al goto
tmp = i
i = goto(i, instructions, b.label)
if i != 0:
pasadas = 0
#print("realizando salto a: "+ str(b.label))
else:
i = tmp
#print("error semantico, etiqueta no existe")
se = seOb(f"Error: etiqueta {b.label} no existe", b.line,
b.column)
semanticErrorList.append(se)
elif isinstance(b, Label):
#insert to symbols table
#type_ = 0
if len(currentParams) > 0:
#procedimiento tipo 7, cambiara a funcion si lee un $Vn
if ts.exist(b.label) == 1:
#print("exists: "+ str(b.label))
type_ = ts.get(b.label).tipo
else:
type_ = TS.TypeData.PROCEDIMIENTO
else:
type_ = TS.TypeData.CONTROL
#print("antes de insertar funcion: " + str(currentParams))
symbol = TS.Symbol(b.label, type_, 0, currentAmbit,
currentParams.copy())
currentParams[:] = [] #clean to current Params
#print("despues de insertar funcion: " + str(symbol.parametros))
if ts.exist(symbol.id) != 1:
ts.add(symbol)
else:
ts.update(symbol)
currentAmbit = b.label
elif isinstance(b, Exit):
break
elif isinstance(b, Unset):
if ts.delete(b.id) == 1:
print('variable eliminada.')
else:
se = seOb(
f'Error Semantico: No se pudo eliminar {b.id}, en funcion unset.',
b.line, b.column)
semanticErrorList.append(se)
i += 1
except:
if isinstance(instructions, Print_):
Print(instructions, ts, printList, textEdit)
elif isinstance(instructions, Declaration):
Declaration_(instructions, ts, textEdit)
elif isinstance(instructions, If):
result = valueExpression(instructions.expression, ts, textEdit)
if result == 1:
tmp = i
i = goto(i + 1, instructions, instructions.label)
if i != 0:
pasadas = 0
#print("realizando salto a: "+ str(b.label))
else:
i = tmp
#print("error semantico, etiqueta no existe")
se = seOb(
f"Error: etiqueta {instructions.label} no existe",
instructions.line, instructions.column)
semanticErrorList.append(se)
elif result == '#':
se = seOb(f"Error: Condicion no valida", instructions.line,
instructions.column)
semanticErrorList.append(se)
elif isinstance(instructions, Goto):
#seteamos la instruccion anterior como la llamada al goto
tmp = i
i = goto(i, instructions, instructions.label)
if i != 0:
pasadas = 0
#print("realizando salto a: "+ str(b.label))
else:
i = tmp
#print("error semantico, etiqueta no existe")
se = seOb(f"Error: etiqueta {instructions.label} no existe",
instructions.line, instructions.column)
semanticErrorList.append(se)
elif isinstance(instructions, Label):
#insert to symbols table
#type_ = 0
if len(currentParams) > 0:
#procedimiento tipo 7, cambiara a funcion si lee un $Vn
if ts.exist(instructions.label) == 1:
#print("exists: "+ str(b.label))
type_ = ts.get(instructions.label).tipo
else:
type_ = TS.TypeData.PROCEDIMIENTO
else:
type_ = TS.TypeData.CONTROL
#print("antes de insertar funcion: " + str(currentParams))
symbol = TS.Symbol(instructions.label, type_, 0, currentAmbit,
currentParams.copy())
currentParams[:] = [] #clean to current Params
#print("despues de insertar funcion: " + str(symbol.parametros))
if ts.exist(symbol.id) != 1:
ts.add(symbol)
else:
ts.update(symbol)
currentAmbit = instructions.label
elif isinstance(instructions, Exit):
return
elif isinstance(instructions, Unset):
if ts.delete(instructions.id) == 1:
print('variable eliminada.')
else:
se = seOb(
f'Error Semantico: No se pudo eliminar {b.id}, en funcion unset.',
b.line, b.column)
semanticErrorList.append(se)
def pass1(self):
"""
pass1의 과정을 수행한다.
1) 프로그램 소스를 스캔하여 토큰 단위로 분리한 뒤 section별로 tokenList에 저장
2) 주소를 할당하고 SYMTAB과 LITTAB 생성
"""
section = -1
locctr = 0
# 한 줄씩 읽어나가며 tokenList에 저장
for line in self.lineList:
temp = line.split("\t")
# 주석 생략
if temp[0] == ".":
continue
# section별로 구분하여 저장
if temp[1] == "START" or temp[1] == "CSECT":
if temp[1] == "CSECT":
self.tokenList[section].tokenList[0].byteSize = locctr
section += 1
locctr = 0
self.symtabList.append(SymbolTable.SymbolTable())
self.littabList.append(LiteralTable.LiteralTable())
self.tokenList.append(
TokenTable.TokenTable(self.symtabList[section],
self.littabList[section],
self.instTable))
self.tokenList[section].puttoken(line, locctr)
# symbol 저장
if len(temp[0]) > 0:
self.tokenList[section].symtab.putsymbol(temp[0], locctr)
# literal 임시 저장
if len(temp) > 2:
if temp[2].startswith("="):
self.tokenList[section].littab.putliteral(temp[2], locctr)
# 주소계산
if self.instTable.instMap.get(temp[1].replace("+",
"")) is not None:
locctr += self.instTable.instMap[temp[1].replace("+",
"")].format
if temp[1].startswith("+"):
locctr += 1
elif temp[1] == "RESB":
locctr += int(temp[2])
elif temp[1] == "RESW":
locctr += int(temp[2]) * 3
elif temp[1] == "BYTE":
# X인 경우
if temp[2].startswith("X"):
locctr += int((len(temp[2]) - 3) / 2)
# C인 경우
else:
locctr += len(temp[2]) - 3
elif temp[1] == "WORD":
locctr += 3
# literal 주소 할당
elif temp[1] == "LTORG" or temp[1] == "END":
for literal in self.littabList[section].littab.keys():
self.littabList[section].modifyliteral(literal, locctr)
if literal.startswith("=X"):
locctr += int((len(literal) - 4) / 2)
else:
locctr += len(literal) - 4
# EQU 값 계산
elif temp[1] == "EQU" and temp[2] != "*":
symbol = temp[2].split("-")
# 다항(-)이면
if len(symbol) > 1:
addr1 = self.symtabList[section].symtab.get(symbol[0])
addr2 = self.symtabList[section].symtab.get(symbol[1])
if addr1 is not None and addr2 is not None:
self.tokenList[section].symtab.modifysymbol(
temp[0], addr1 - addr2)
else:
self.tokenList[section].symtab.modifysymbol(temp[0], 0)
# 단항이면
else:
addr = self.symtabList[section].symtab.get(symbol[0])
if addr is not None:
self.tokenList[section].symtab.modifysymbol(
temp[0], addr)
else:
self.tokenList[section].symtab.modifysymbol(temp[0], 0)
self.tokenList[section].tokenList[0].byteSize = locctr
import JackTokenizer import CompilationEngine import os import VMWriter import SymbolTable rfile = r"C:\Users\Liu_100\Desktop\nand2tetris\nand2tetris\projects\11\Pong\Ball.jack" xml = os.path.splitext(rfile)[0] + 'MyVersion.xml' vm = os.path.splitext(rfile)[0] + 'MyVersion.vm' xml = open(xml, 'w') vm = open(vm, 'w') jackTokenizer = JackTokenizer.jacktokenizer(rfile, xml) vmWriter = VMWriter.VMWriter(vm) symbolTable = SymbolTable.SymbolTable() compiler = CompilationEngine.compilationengine(xml, symbolTable, vmWriter) compiler.compileClass(jackTokenizer) xml.close() vmWriter.close()
class TypeChecker(NodeVisitor):
def __init__(self):
self.table = SymbolTable(None, 'Program')
self.a = AllowedOperations()
self.in_loop = 0
def visit_Program(self, node):
logger.debug("Visiting program")
self.visit(node.instructions_opt)
def visit_InstructionsOpt(self, node):
if node.instructions is not None:
self.visit(node.instructions)
else:
logger.info("No instructions in instructions opt.")
def visit_Instructions(self, node):
self.visit(node.instruction)
if node.instructions is not None:
self.visit(node.instructions)
def visit_Instruction(self, node):
self.visit(node.instruction)
def visit_InstructionIf(self, node):
self.visit(node.condition)
self.visit(node.instruction)
def visit_InstructionIfElse(self, node):
self.visit(node.condition)
self.visit(node.then_part)
self.visit(node.else_part)
def visit_For(self, node):
self.visit(node.iterator)
self.visit(node.range_start)
self.visit(node.range_end)
self.in_loop += 1
self.visit(node.instruction)
self.in_loop -= 1
def visit_While(self, node):
self.visit(node.condition)
self.in_loop += 1
self.visit(node.instruction)
self.in_loop -= 1
def visit_Assign(self, node):
left_symbol = self.visit(node.left)
op = node.op
right_symbol = self.visit(node.right)
type = self.a.get_type_from_symbols(op, left_symbol, right_symbol)
if type is not None:
# right hand side equals to something
if type is 'array':
# assigning an array, check if it is legal
new_dim = self.a.new_array_dimensions(op, left_symbol,
right_symbol)
if new_dim is not None:
print("Line ", node.line, " array assignment l: ",
left_symbol, "op: ", op, "r: ", right_symbol)
self.table.put(
left_symbol.name,
ArraySymbol(left_symbol.name, right_symbol.dimensions))
else:
print("Line ", node.line, "! wrong array assignment: l: ",
left_symbol, "op: \"", op, "\" r: ", right_symbol)
else:
# assigning variable, not an array
print("Line ", node.line, " assignment l: ", left_symbol,
"op: ", op, "r: ", right_symbol)
self.table.put(
left_symbol.name,
VariableSymbol(left_symbol.name, right_symbol.type))
else:
# right hand side is wrong, cannot assign
print("Line ", node.line, "! wrong assignment: l: ", left_symbol,
"op: \"", op, "\" r: ", right_symbol)
logger.debug(str(["l: ", left_symbol, "op: ", op, "r: ",
right_symbol]))
def visit_KeyPhrase(self, node):
if (node.word == 'continue'
or node.word == 'break') and not self.in_loop > 0:
print("Line ", node.line, "! BREAK or CONTINUE outside a loop")
else:
# self.visit(node.word)
if node.argument is not None:
self.visit(node.argument)
def visit_Condition(self, node):
sym_left = self.visit(node.left)
op = node.op
sym_right = self.visit(node.right)
new_type = self.a.get_type_from_symbols(op, sym_left, sym_right)
if new_type != 'int':
print(new_type, op, sym_left, sym_right)
print("Wrong condition")
#return VariableSymbol(None, 'int')
def visit_Expressions(self, node):
#
self.visit(node.expression)
if node.expressions is not None:
self.visit(node.expressions)
def visit_NumericExpression(self, node):
return self.visit(node.number)
def visit_IntNum(self, node):
logger.debug('int: ' + str(node.value))
#print('int', node.value)
return VariableSymbol(None, 'int')
def visit_FloatNum(self, node):
return VariableSymbol(None, 'float')
def visit_LValue(self, node):
return self.visit(node.value)
def visit_ID(self, node):
logger.debug("ID: " + node.id)
#print("ID: " + node.id + " " + str(node.line))
ret = self.table.get(node.id)
#print(ret)
if ret is None:
new_id_symbol = VariableSymbol(node.id, None)
self.table.put(node.id, new_id_symbol)
return new_id_symbol
else:
return ret
def visit_Number(self, node):
return self.visit(node.number)
def visit_MatrixExpression(self, node):
return self.visit(node.matrix)
def visit_Matrix(self, node):
#print("MATRIX")
vector = self.visit(node.elements)
# unpacking vectors to check sizes... not so great
while isinstance(vector.dimensions[0], ArraySymbol):
for i, dim in enumerate(vector.dimensions):
vector.dimensions[i] = dim.dimensions
if all(dim == vector.dimensions[0] for dim in vector.dimensions):
return vector
else:
if vector.name is not None:
print("Line ", node.line, "! wrong dimensions in ",
vector.name)
else:
print("Line ", node.line,
"! wrong dimensions in unnamed vector.",
vector.dimensions)
return ArraySymbol(None, None)
def visit_IntNumbers(self, node):
#print("INTNUMBERS")
self.visit(node.number)
if node.numbers is not None:
self.visit(node.numbers)
def visit_Matrices(self, node):
#print("MATRICES")
if node.matrices is not None:
return ArraySymbol(None, [self.visit(node.matrix)] +
self.visit(node.matrices).dimensions)
return ArraySymbol(None, [self.visit(node.matrix)])
def visit_Vectors(self, node):
#print("VECTORS")
if node.vectors is not None:
return ArraySymbol(None, [self.visit(node.vector)] +
self.visit(node.vectors).dimensions)
else:
return ArraySymbol(None, [self.visit(node.vector)])
def visit_AllNumbers(self, node):
# returns size of the vector
if node.numbers is not None:
return 1 + self.visit(node.numbers)
return 1
def visit_BinOp(self, node):
# alternative usage,
# requires definition of accept method in class Node
left_symbol = self.visit(node.left) # type1 = node.left.accept(self)
right_symbol = self.visit(
node.right) # type2 = node.right.accept(self)
op = node.op
return_type = self.a.get_type_from_symbols(op, left_symbol,
right_symbol)
if return_type is 'array':
new_dim = self.a.new_array_dimensions(op, left_symbol,
right_symbol)
if new_dim is None:
print("Line ", node.line, "! wrong array binop: ", op,
" left: ", left_symbol, "right: ", right_symbol)
return ArraySymbol(None, None)
else:
return ArraySymbol(None, new_dim)
if return_type is None:
print("Line ", node.line, "! wrong binop: ", op, " left: ",
left_symbol, "right: ", right_symbol)
#print("BINOP", return_type)
return VariableSymbol(None, return_type)
def visit_DotOp(self, node):
left_symbol = self.visit(node.left)
right_symbol = self.visit(node.right)
op = node.op
#op = self.visit(node.op)
return_type = self.a.get_type_from_symbols(op, left_symbol,
right_symbol)
if return_type is 'array':
new_dim = self.a.new_array_dimensions(op, left_symbol,
right_symbol)
if new_dim is None:
print("Line ", node.line, "! wrong dotop: ", op, " left: ",
left_symbol, "right: ", right_symbol)
return ArraySymbol(None, None)
else:
return ArraySymbol(None, new_dim)
if return_type is None:
print("Line ", node.line, "! wrong dotop: ", op, " left: ",
left_symbol, "right: ", right_symbol)
# print("DotOp", return_type)
return VariableSymbol(None, return_type)
def visit_Transpose(self, node):
# TODO change sizes? check if matrix
return self.visit(node.expression)
def visit_Negation(self, node):
# TODO check if can be negated?
return self.visit(node.expression)
def visit_String(self, node):
return VariableSymbol(None, 'string')
def visit_Function(self, node):
#print("FUN", node.function, node.argument.number.number.value)
args = get_matrix_size(node.argument)
#print("ARGS: ", args)
return ArraySymbol(None, args)
def visit_ArrayIndex(self, node):
# TODO nie wiem jak i kiedy wnioskować,
# na pewno nie zawsze się da...
# returns type of elements in array
array_symbol = self.table.get(node.id.id)
if array_symbol is not None:
if array_symbol.type != 'array':
print("Line ", node.line, ": ", node.id.id,
"! is not an array!")
return VariableSymbol(None, None)
else:
size = []
append_int_numbers_to_list(node.numbers, size)
if len(size) != len(array_symbol.dimensions):
print("Line ", node.line, "! wrong dimensions in",
node.id.id)
return VariableSymbol(None, None)
elif not all(a < b
for a, b in zip(size, array_symbol.dimensions)):
print("Line ", node.line, "! out of bounds in", node.id.id)
return VariableSymbol(None, None)
else:
print("Line ", node.line, "! no such array: ", node.id.id)
return VariableSymbol(None, None)
return VariableSymbol(None, 'float')
def get_symbol_table(self):
return self.table
import SymbolTable
filename = sys.argv[1]
ifile = open(filename, 'r')
strfile = ifile.read()
instr = strfile.split('\n')
i = 0
l1 = ['', '\r', '\n']
instr_str = []
for x in instr:
if not x.startwith('//'):
if x not in l1:
instr_str.append(x.strip('\r'))
address = 16
sym = SymbolTable.Constructor()
for x in instr_str:
if x.find('@') >= 0 or x.find('(') >= 0:
symbol = Parser.symbol(x)
if not SymbolTable.contains(symbol, sym) and not symbol.isdigit():
sym = SymbolTable.addEntry(symbol, address, sym)
address = address + 1
while Parser.hasMoreCommands(i, instr_str):
c_type = Parser.commandType(instr_str[i])
if c_type == 'A':
str1 = Parser.symbol(instr_str[i])
if str1.isdigit():
str1 = bin(int(str1))[2:]
address = str1.zfill(16)
def create_signalGroups(string, name = "", file = "", debug=False):
func = "SignalGroups.create_signalGroups"
tokens = sutils.lex(string=string, debug=debug)
sytbl = STBL.SymbolTable(tokens=tokens, debug=debug)
if debug:
print("DEBUG: (%s): Tokens: %s "% (func, tokens))
print("DEBUG: (%s): SymbolTable: %s"%(func, sytbl))
signalGroups = {}
signalGroupName = ""
if not name:
_start, _end = sytbl.get_next_set(0, 'curly-brackets')
if _start == 1: name = KLU.References.GLOBAL
elif _start == 2: name = tokens[1]["token"]
else: raise ValueError("Unable to extract domain-name.")
else:
if debug: print("DEBUG: (%s): Received domain name: %s"%(func, name))
# Get list of single quote parings:
singleQuotePairs = sytbl.get_list(category="single-quotes")
i = 0; end = len(singleQuotePairs) - 1;
while i <= end:
signalGroupName = ""
signalGroupSignals = []
_start, _end = singleQuotePairs[i]
# TODO: Can place some sanity checks here: length= 1|3|5|etc. even not allowed
# NOTE: Evaluate left side: extract signalGroup name
if tokens[_start-1]['tag'] != '=':
raise SyntaxError("Must invalid syntax: Expected '='.")
if tokens[_start-2]['tag'] != 'identifier':
raise SyntaxError("Must invalid syntax: Expected signal group name.")
else: signalGroupName = tokens[_start-2]['token']
if debug: print("DEBUG: (%s): Found signalgroup name: %s"%(func, signalGroupName))
# NOTE: Check contents:
j = _start + 1; jend = _end - 1
while j <= jend :
if j == (_start + 1): # First element
if tokens[j]['tag'] != 'identifier': raise SyntaxError("Expecting an identifier")
entity = tokens[j]['token']
if entity in signalGroups:
entity = signalGroups[entity]["signals"]
if debug: print("DEBUG: (%s): Found a group name within content '%s', Expandng to '%s'"%(func, tokens[j]['token'], entity))
signalGroupSignals += entity
else:
signalGroupSignals.append(entity)
j+=1; continue
if tokens[j]['tag'] == '+':
if tokens[j+1]['tag'] != 'identifier': raise SyntaxError("An identifier must follow a '+'.")
entity = tokens[j+1]['token']
if entity in signalGroups:
entity = signalGroups[entity]["signals"]
if debug: print("DEBUG: (%s): Found a group name within content '%s', Expandng to '%s'"%(func, tokens[j]['token'], entity))
signalGroupSignals += entity
else:
signalGroupSignals.append(entity)
j += 2; continue
if tokens[j]['tag'] == '-':
if tokens[j+1]['tag'] != 'identifier': raise SyntaxError("An identifier must follow a '+'.")
entity = tokens[j+1]['token']
if entity in signalGroups:
entity = signalGroups[entity]["signals"]
if debug: print("DEBUG: (%s): Found a group name within content '%s', Expandng to '%s'"%(func, tokens[j]['token'], entity))
for substractSignal in entity:
signalGroupSignals.remove(substractSignal)
else:
signalGroupSignals.remove(entity)
j += 2; continue
j+=1
# NOTE: Check right-hand side:
if tokens[_end+1]['tag'] == ';':
if signalGroupName == "": raise RuntimeError("SignalGroup name is not set.")
if signalGroupSignals == []: raise RuntimeError("SignalGroup list is empty.")
signalGroups[signalGroupName] = {"signals": signalGroupSignals,
"properties" : {}}
if debug: print("DEBUG: (%s): Added '%s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
elif tokens[_end+1]['tag'] == '{':
#print("Continuing")
# TODO: Grab next set of curly....
cs , ce = sytbl.get_next_set(_end, category='curly-brackets')
j = cs + 1; jend = ce -1;
while (j <= jend):
if tokens[j]['tag'] == "Base":
if tokens[j+1]['tag'] == "Hex" or tokens[j+1]['tag'] == "Dec":
if tokens[j+2]['tag'] == 'identifier':
if tokens[j+3]['tag'] == ';':
if signalGroupName == "": raise RuntimeError("SignalGroup name is not set.")
if signalGroupSignals == []: raise RuntimeError("SignalGroup list is empty.")
if signalGroupName in signalGroups:
signalGroups[signalGroupName]['properties']['Base'] = [tokens[j+1]['token'], tokens[j+2]['token']]
if debug: print("DEBUG: (%s): Added 'Base' to signal %s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
else:
signalGroups[signalGroupName] = {"signals": signalGroupSignals,
"properties" : {
"Base": [tokens[j+1]['token'], tokens[j+2]['token']]
}}
if debug: print("DEBUG: (%s): Added '%s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
j += 4; continue
else: raise SyntaxError("Base needs to be terminated with semicolon.")
else: raise SyntaxError("Base needs waveform characters.")
else: raise SyntaxError("Expecting 'Hex' or 'Dec' directly after 'Base'.")
if tokens[j]['tag'] == 'Alignment':
if tokens[j+1]['tag'] == 'MSB' or tokens[j+1]['tag'] == 'LSB':
if tokens[j+2]['tag'] == ';':
if signalGroupName == "": raise RuntimeError("SignalGroup name is not set.")
if signalGroupSignals == []: raise RuntimeError("SignalGroup list is empty.")
if signalGroupName in signalGroups:
signalGroups[signalGroupName]['properties']['Alignment'] = tokens[j+1]['token']
if debug: print("DEBUG: (%s): Added 'Alignment' to signal %s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
else:
signalGroups[signalGroupName] = {"signals": signalGroupSignals,
"properties" : {
"Alignment": tokens[j+1]
}}
if debug: print("DEBUG: (%s): Added '%s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
j += 3; continue
else: raise SyntaxError("Alignment must end in semicolon")
else: raise SyntaxError("Alignment is only allowed 'MSB' or 'LSB'")
if tokens[j]['tag'] == "ScanOut":
if tokens[j+1]['tag'] == "digits":
if tokens[j+2]['tag'] == ';':
if signalGroupName == "": raise RuntimeError("SignalGroup name is not set.")
if signalGroupSignals == []: raise RuntimeError("SignalGroup list is empty.")
if signalGroupName in signalGroups:
signalGroups[signalGroupName]['properties']['ScanOut'] = tokens[j+1]['token']
if debug: print("DEBUG: (%s): Added 'ScanOut' to signal %s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
else:
signalGroups[signalGroupName] = {"signals": signalGroupSignals,
"properties" : {
"ScanOut": tokens[j+1]['token']
}}
if debug: print("DEBUG: (%s): Added '%s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
j += 3; continue
else: raise SyntaxError("Alignment must end in semicolon")
elif tokens[j+1]['tag'] == ';':
if signalGroupName == "": raise RuntimeError("SignalGroup name is not set.")
if signalGroupSignals == []: raise RuntimeError("SignalGroup list is empty.")
if signalGroupName in signalGroups:
signalGroups[signalGroupName]['properties']['ScanOut'] = True
if debug: print("DEBUG: (%s): Added 'ScanOut' to signal %s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
else:
signalGroups[signalGroupName] = {"signals": signalGroupSignals,
"properties" : {
"ScanOut": True
}}
if debug: print("DEBUG: (%s): Added '%s' to signalGroups: %s"%(func, signalGroupName, signalGroups[signalGroupName]))
j += 2; continue
else: raise SyntaxError("Expecting ; or digit after ScanOut")
j += 1
else: raise SyntaxError("Expected ';' or '{'")
i += 1
if debug:
for grp in signalGroups:
print("DEBUG: (%s): Signal Group: %s"%(func, grp))
print("DEBUG: (%s): -> %s"%(func, signalGroups[grp]))
return SignalGroups(name = name, file = file, mapping = signalGroups)
def __init__(self):
self._symbolTable = SymbolTable.SymbolTable()
#!/usr/bin/python
import sys
import Parser
import Code
import SymbolTable
filename = sys.argv[1]
symboldict = SymbolTable.Constructor()
rfile = open(filename, 'r')
i = 0
linepre = rfile.readline()
flag = Parser.hasMoreCommands(linepre)
while flag:
while linepre == '\r\n' or linepre.startswith('//'):
linepre = rfile.readline()
if linepre.find('(') >= 0:
linepre = linepre.strip()
symbol = linepre.strip('()\n')
if not SymbolTable.contains(symbol, symboldict):
symboldict = SymbolTable.addEntry(symbol, i, symboldict)
else:
i += 1
linepre = Parser.advance(rfile, linepre)
flag = Parser.hasMoreCommands(linepre)
rfile.close()
j = 0
def ClearScope():
# Clears the local variables from SymbolTable upon competion of subprogram
Display("ClearScope",_list)
SymbolTable.clearScope()
class CompilationEngine:
def __init__(self, inpath, outpath):
self.tokenizer = Tokenizer(inpath)
self.symboltable = SymbolTable()
self.vmwriter = VMWriter(outpath)
self._class_name = None
if self.tokenizer.has_more_tokens():
self.compile_class()
self.vmwriter.close()
print("{0} completed.".format(outpath))
def _subroutine_init(self):
self._sub_kind = None
self._sub_name = None
self._ret_type = None
def _advance(self):
self._check_EOF()
self.tokenizer.advance()
@property
def _current_token(self):
t_type = self.tokenizer.token_type
return (self.tokenizer.keyword if t_type == T_KEYWORD else
self.tokenizer.symbol if t_type == T_SYMBOL else
self.tokenizer.identifier if t_type == T_ID else self.tokenizer
.intval if t_type == T_INTEGER else self.tokenizer.stringval)
@property
def _current_tok_type(self):
return self.tokenizer.token_type
@property
def _current_tok_tag(self):
return token_tags[self._current_tok_type]
@property
def _next_token(self):
"""return raw next_token in the tokenizer"""
return str(self.tokenizer.next_token)
def _require_token(self, tok_type, token=None):
"""Check whether the next_token(terminal) in the tokenizer meets the
requirement (specific token or just token type). If meets, tokenizer
advances (update current_token and next_token) and terminal will be
writed into outfile; If not, report an error."""
self._advance()
if token and self._current_token != token:
return self._error(expect_toks=(token, ))
elif self._current_tok_type != tok_type:
return self._error(expect_types=(tok_type, ))
def _require_id(self):
self._require_token(T_ID)
def _require_kw(self, token):
return self._require_token(T_KEYWORD, token=token)
def _require_sym(self, token):
return self._require_token(T_SYMBOL, token=token)
def _require_brackets(self, brackets, procedure):
front, back = brackets
self._require_sym(front)
procedure()
self._require_sym(back)
def _fol_by_class_vardec(self):
return self._next_token in (KW_STATIC, KW_FIELD)
def _fol_by_subroutine(self):
return self._next_token in (KW_CONSTRUCTOR, KW_FUNCTION, KW_METHOD)
def _fol_by_vardec(self):
return self._next_token == KW_VAR
#########################
# structure compilation #
#########################
def compile_class_name(self):
self._require_id()
self._class_name = self._current_token
def compile_subroutine_name(self):
self._require_id()
self._sub_name = self._current_token
def compile_var_name(self, kind=None, type=None, declare=False):
self._require_id()
name = self._current_token
if declare is True: # kind and type are not None
self.symboltable.define(name, type, kind)
else:
self.check_var_name(name, type)
def check_var_name(self, name, type=None):
recorded_kind = self.symboltable.kindof(name)
if recorded_kind is None:
self._traceback('name used before declared: {0}'.format(name))
elif type is not None:
recorded_type = self.symboltable.typeof(name)
if recorded_type != type:
get = '{0} "{1}"'.format(recorded_type, name)
self._error(expect_types=(type, ), get=get)
def compile_type(self, advanced=False, expect='type'):
# int, string, boolean or identifier(className)
if advanced is False:
self._advance()
if (self._current_token not in SymbolTable.builtIn_types
and self._current_tok_type != T_ID):
return self._error(expect=expect)
def compile_return_type(self):
# void or type
self._advance()
if self._current_token != KW_VOID:
self.compile_type(True, '"void" or type')
self._ret_type = self._current_token
if self._sub_kind == KW_CONSTRUCTOR and self._ret_type != self._class_name:
me = 'constructor expect current class as return type'
self._traceback(me)
@record_non_terminal('class')
def compile_class(self):
# 'class' className '{' classVarDec* subroutineDec* '}'
self._require_kw(KW_CLASS)
self.compile_class_name()
self._require_sym('{')
while self._fol_by_class_vardec():
self.compile_class_vardec()
while self._fol_by_subroutine():
self.compile_subroutine()
self._advance()
if self._current_token != '}':
self._traceback("Except classVarDec first, subroutineDec second.")
if self.tokenizer.has_more_tokens():
if self._next_token == KW_CLASS:
self._traceback('Only expect one classDec.')
self._traceback('Unexpected extra tokens.')
def compile_declare(self):
self._advance()
id_kind = self._current_token # ('static | field | var')
# type varName (',' varName)* ';'
self.compile_type()
id_type = self._current_token
self.compile_var_name(id_kind, id_type, declare=True)
# compile ',' or ';'
self._advance()
while self._current_token == ',':
self.compile_var_name(id_kind, id_type, declare=True)
self._advance()
if self._current_token != ';':
return self._error((',', ';'))
@record_non_terminal('classVarDec')
def compile_class_vardec(self):
# ('static|field') type varName (',' varName)* ';'
self.compile_declare()
@record_non_terminal('subroutineDec')
def compile_subroutine(self):
# ('constructor'|'function'|'method')
# ('void'|type) subroutineName '(' parameterList ')' subroutineBody
self._subroutine_init()
self.symboltable.start_subroutine()
self._advance()
self._sub_kind = self._current_token
if self._sub_kind == KW_METHOD:
self.symboltable.define('this', self._class_name, 'argument')
self.compile_return_type()
self.compile_subroutine_name()
self._require_brackets('()', self.compile_parameter_list)
self.compile_subroutine_body()
@record_non_terminal('parameterList')
def compile_parameter_list(self):
# ((type varName) (',' type varName)*)?
if self._next_token == ')':
return
self.compile_type()
self.compile_var_name('argument', self._current_token, True)
while self._next_token != ')':
self._require_sym(',')
self.compile_type()
self.compile_var_name('argument', self._current_token, True)
@record_non_terminal('subroutineBody')
def compile_subroutine_body(self):
# '{' varDec* statements '}'
self._require_sym('{')
while self._fol_by_vardec():
self.compile_vardec()
self.compile_function()
self.compile_statements()
self._require_sym('}')
def compile_function(self):
fn_name = '.'.join((self._class_name, self._sub_name))
num_locals = self.symboltable.varcount(KW_VAR)
self.vmwriter.write_function(fn_name,
num_locals) # function fn_name num_locals
# set up pointer this
if self._sub_kind == KW_CONSTRUCTOR:
num_fields = self.symboltable.varcount(KW_FIELD)
self.vmwriter.write_push('constant', num_fields)
self.vmwriter.write_call('Memory.alloc', 1)
self.vmwriter.write_pop('pointer', 0)
elif self._sub_kind == KW_METHOD:
self.vmwriter.write_push('argument', 0)
self.vmwriter.write_pop('pointer', 0)
@record_non_terminal('varDec')
def compile_vardec(self):
# 'var' type varName (',' varName)* ';'
self.compile_declare()
#########################
# statement compilation #
#########################
@record_non_terminal('statements')
def compile_statements(self):
# (letStatement | ifStatement | whileStatement | doStatement |
# returnStatement)*
last_statement = None
while self._next_token != '}':
self._advance()
last_statement = self._current_token
if last_statement == 'do':
self.compile_do()
elif last_statement == 'let':
self.compile_let()
elif last_statement == 'while':
self.compile_while()
elif last_statement == 'return':
self.compile_return()
elif last_statement == 'if':
self.compile_if()
else:
return self._error(expect='statement expression')
#if STACK[-2] == 'subroutineBody' and last_statement != 'return':
# self._error(expect='return statement', get=last_statement)
@record_non_terminal('doStatement')
def compile_do(self):
# 'do' subroutineCall ';'
self._advance()
self.compile_subroutine_call()
self.vmwriter.write_pop('temp', 0) # temp[0] store useless value
self._require_sym(';')
@record_non_terminal('letStatement')
def compile_let(self):
# 'let' varName ('[' expression ']')? '=' expression ';'
self.compile_var_name()
var_name = self._current_token
array = (self._next_token == '[')
if array:
self.compile_array_subscript(
var_name) # push (array base + subscript)
self._require_sym('=')
self.compile_expression() # push expression value
self._require_sym(';')
if array:
self.vmwriter.write_pop('temp', 1) # pop exp value to temp[1]
self.vmwriter.write_pop('pointer',
1) # that = array base + subscript
self.vmwriter.write_push('temp', 1)
self.vmwriter.write_pop('that', 0)
else:
self.assign_variable(var_name)
kind_segment = {
'static': 'static',
'field': 'this',
'argument': 'argument',
'var': 'local'
}
def assign_variable(self, name):
kind = self.symboltable.kindof(name)
index = self.symboltable.indexof(name)
self.vmwriter.write_pop(self.kind_segment[kind], index)
def load_variable(self, name):
kind = self.symboltable.kindof(name)
index = self.symboltable.indexof(name)
self.vmwriter.write_push(self.kind_segment[kind], index)
label_num = 0
@record_non_terminal('whileStatement')
def compile_while(self):
# 'while' '(' expression ')' '{' statements '}'
start_label = 'WHILE_START_' + str(self.label_num)
end_label = 'WHILE_END_' + str(self.label_num)
self.label_num += 1
self.vmwriter.write_label(start_label)
self.compile_cond_expression(start_label, end_label)
@record_non_terminal('ifStatement')
def compile_if(self):
# 'if' '(' expression ')' '{' statements '}'
# ('else' '{' statements '}')?
else_label = 'IF_ELSE_' + str(self.label_num)
end_label = 'IF_END_' + str(self.label_num)
self.label_num += 1
self.compile_cond_expression(end_label, else_label)
# else clause
if self._next_token == KW_ELSE:
self._require_kw(KW_ELSE)
self._require_brackets('{}', self.compile_statements)
self.vmwriter.write_label(end_label)
def compile_cond_expression(self, goto_label, end_label):
self._require_brackets('()', self.compile_expression)
self.vmwriter.write_arithmetic('not')
self.vmwriter.write_if(end_label)
self._require_brackets('{}', self.compile_statements)
self.vmwriter.write_goto(goto_label) # meet
self.vmwriter.write_label(end_label)
@record_non_terminal('returnStatement')
def compile_return(self):
# 'return' expression? ';'
if self._sub_kind == KW_CONSTRUCTOR:
self._require_kw(KW_THIS) # constructor must return 'this'
self.vmwriter.write_push('pointer', 0)
elif self._next_token != ';':
self.compile_expression()
else:
if self._ret_type != KW_VOID:
self._traceback('expect return ' + self._ret_type)
self.vmwriter.write_push('constant', 0)
self._require_sym(';')
self.vmwriter.write_return()
##########################
# expression compilation #
##########################
unary_ops = {'-': 'neg', '~': 'not'}
binary_ops = {
'+': 'add',
'-': 'sub',
'*': None,
'/': None,
'&': 'and',
'|': 'or',
'<': 'lt',
'>': 'gt',
'=': 'eq'
}
@record_non_terminal('expression')
def compile_expression(self):
# term (op term)*
self.compile_term()
while self._next_token in self.binary_ops:
self._advance()
if self._current_tok_type != T_SYMBOL:
self._error(expect_types=(T_SYMBOL, ))
op = self._current_token
self.compile_term()
self.compile_binaryop(op)
def compile_binaryop(self, op):
if op == '*':
self.vmwriter.write_call('Math.multiply', 2)
elif op == '/':
self.vmwriter.write_call('Math.divide', 2)
else:
self.vmwriter.write_arithmetic(self.binary_ops[op])
kw_consts = (KW_TRUE, KW_FALSE, KW_NULL, KW_THIS)
@record_non_terminal('term')
def compile_term(self):
# integerConstant | stringConstant | keywordConstant |
# varName | varName '[' expression ']' | subroutineCall |
# '(' expression ')' | unaryOp term
if self._next_token == '(':
self._require_brackets('()', self.compile_expression)
else:
self._advance()
tok = self._current_token
tok_type = self._current_tok_type
if tok_type == T_KEYWORD and tok in self.kw_consts:
self.compile_kw_consts(tok)
elif tok_type == T_INTEGER:
self.vmwriter.write_push('constant', tok)
elif tok_type == T_STRING:
self.compile_string(tok)
elif tok_type == T_ID:
if self._next_token in '(.':
self.compile_subroutine_call()
elif self._next_token == '[':
self.check_var_name(tok)
self.compile_array_subscript(tok)
self.vmwriter.write_pop('pointer', 1)
self.vmwriter.write_push('that', 0)
else:
self.check_var_name(tok)
self.load_variable(tok)
elif tok_type == T_SYMBOL and tok in self.unary_ops:
self.compile_term()
self.vmwriter.write_arithmetic(self.unary_ops[tok])
else:
self._error(expect='term')
# keywordConstant: 'true' | 'false' | 'null' | 'this'
def compile_kw_consts(self, kw):
if kw == KW_THIS:
self.vmwriter.write_push('pointer', 0)
elif kw == KW_TRUE:
self.vmwriter.write_push('constant', 1)
self.vmwriter.write_arithmetic('neg')
else:
self.vmwriter.write_push('constant', 0)
def compile_string(self, string):
self.vmwriter.write_push('constant', len(string))
self.vmwriter.write_call('String.new', 1)
for char in string:
self.vmwriter.write_push('constant', ord(char))
self.vmwriter.write_call('String.appendChar', 2)
def compile_subroutine_call(self):
# subroutineName '(' expressionList ')' |
# (className | varName) '.' subroutineName '(' expressionList ')'
## the first element of structure has already been compiled.
fn_name, num_args = self.compile_call_name()
self._require_sym('(')
num_args = self.compile_expressionlist(num_args)
self._require_sym(')')
self.vmwriter.write_call(fn_name, num_args)
def compile_call_name(self):
# the fisrt name of subroutine call could be (className or varName) if
# it is followed by '.', or subroutineName if followed by '('.
# return name of function call and num_args (1: means pushing this, 0:
# means don't)
if self._current_tok_type != T_ID:
self._error(expect_types=(T_ID, ))
name = self._current_token
if self._next_token == '.':
self._require_sym('.')
self.compile_subroutine_name()
sub_name = self._current_token
if (name in self.symboltable.all_class_types()
or name in SymbolTable.builtIn_class
or name == self._class_name):
return '.'.join((name, sub_name)), 0 # className
else:
self.check_var_name(name) # varName with class type
type = self.symboltable.typeof(name)
if type in SymbolTable.builtIn_types:
return self._error(expect='class instance or class',
get=type)
self.load_variable(name)
return '.'.join((type, sub_name)), 1
elif self._next_token == '(':
self.vmwriter.write_push('pointer', 0) # push this to be 1st arg
return '.'.join((self._class_name, name)), 1 # subroutineName
@record_non_terminal('expressionList')
def compile_expressionlist(self, num_args):
# (expression (',' expression)*)?
if self._next_token != ')':
self.compile_expression()
num_args += 1
while self._next_token != ')':
self._require_sym(',')
self.compile_expression()
num_args += 1
return num_args
def compile_array_subscript(self, var_name):
# varName '[' expression ']'
self.check_var_name(var_name, 'Array')
self._require_brackets(
'[]', self.compile_expression) # push expression value
self.load_variable(var_name)
self.vmwriter.write_arithmetic('add') # base + subscript
def _check_EOF(self):
if not self.tokenizer.has_more_tokens():
self._traceback("Unexpected EOF.")
def _error(self, expect_toks=(), expect_types=(), expect=None, get=None):
if expect is None:
exp_tok = ' or '.join(('"{0}"'.format(t) for t in expect_toks))
exp_types = ('type {0}'.format(token_tags[t])
for t in expect_types)
exp_type = ' or '.join(exp_types)
if exp_tok and exp_type:
expect = ' or '.join(exp_tok, exp_type)
else:
expect = exp_tok + exp_type
if get is None:
get = self._current_token
me = 'Expect {0} but get "{1}"'.format(expect, get)
return self._traceback(me)
def _traceback(self, message):
if DEBUG:
print('--------------------------------------------')
print(self.symboltable)
print(self.symboltable.all_class_types())
print('--------------------------------------------')
file_info = 'file: "{0}"'.format(self.tokenizer.filename)
line_info = 'line {0}'.format(self.tokenizer.line_count)
raise CompileError("{0}, {1}: {2}".format(file_info, line_info,
message))
def visit_Arg(self, node):
self.current_symbol_table.put(
node.name, SymbolTable.VariableSymbol(node.name, node.type))
self.carried_info["funsymbol"].argtypes.append(node.type)
return node.type
def GenNewContext(self):
newContext = Context(self.name, self.context, self.startPos)
newContext.symbTable = SymbolTable(newContext.parent.symbTable)
return newContext
def CompileLet(tokens): # let statement
global pos
global fpw
#'let'
pos += 1
# variable name
varName = tokens[pos]
if varName in SymbolTable.subroutineTable.keys(): # local scope
index = SymbolTable.indexOf(varName) # get index of this variable
kind = SymbolTable.kindOf(varName) # get kind of this variable
if tokens[pos+1] == '[': # variable is an array
if kind == 'var':
fpw.write('push local '+ str(index)+'\n') # push base address onto stack
else:
fpw.write('push '+kind +' '+ str(index)+'\n')
pos += 2 # compile expresion in [exp]
CompileExpression(tokens)
fpw.write('add\n') # add these two parts, then get a target address
# push expression value of on the left of '='
pos += 2 # jump off '='
CompileExpression(tokens)
# assignment
fpw.write('pop temp 0\n')
fpw.write('pop pointer 1\n') # pop into that, now that points to the address of a[exp]
# ']'
fpw.write('push temp 0\n')
fpw.write('pop that 0\n')
else: # just an variable, simply push it
pos += 1 # comes to '='
pos += 1 # comes to expression
CompileExpression(tokens)
if kind == 'var':
fpw.write('pop local '+ str(index)+'\n') # pop x
else:
fpw.write('pop ' + kind+' '+str(index)+ ' \n') # pop x
elif varName in SymbolTable.classTable.keys(): # global scope
index = SymbolTable.indexOf(varName) # get index of this variable
kind = SymbolTable.kindOf(varName) # get kind of this variable
if tokens[pos+1] == '[': # variable is an array
if kind == 'field':
fpw.write('push this '+str(index) +' \n')
else:
fpw.write('push '+kind +' '+ str(index)+'\n')
pos += 2 # compile expresion in [exp]
CompileExpression(tokens)
fpw.write('add\n') # add these two parts, then get a target address
# push expression value of on the left of '='
pos += 2 # jump off '='
CompileExpression(tokens)
# assignment
fpw.write('pop temp 0\n')
fpw.write('pop pointer 1\n') # pop into that, now that points to the address of a[exp]
# ']'
fpw.write('push temp 0\n')
fpw.write('pop that 0\n')
else: # just an variable, simply push it
pos += 1 # comes to '='
pos += 1 # comes to expression
CompileExpression(tokens)
if kind == 'field':
fpw.write('pop this '+str(index)+ ' \n') # pop field x
else:
fpw.write('pop '+kind +' '+str(index)+ ' \n') # pop static x
pos += 1
def __init__(self,lexicalAnalysis): self.Lexical = lexicalAnalysis self.SymbolTable = SymbolTable() self.FirstPass = None self.Next = False
def Enter(symbol):
#add a variable to the hash table and string space
Display("Enter", _list)
SymbolTable.enterSymbol(symbol)
def __init__(self, files):
self.files = files
self.symtable = SymbolTable()
import sys
sys.path.append("../")
import Compiler
from SymbolTable import *
from Symbol import *
s = SymbolTable()
i = 0
while i < 100:
sym = Symbol("var" + str(i), SymbolType.VARIABLE, i % 2)
s.insert(sym)
i += 1
Compiler.Compiler.debugOn()
s.clearLocalTable()
s.dump()
print s.get("var2").toString()
def symbol_phase1(expression, line_count):
if "(" in expression:
SymbolTable.addEntry(expression[1:-1], line_count)
return SymbolTable.getAddress(expression[1:-1])
class Parser:
def __init__(self):
self.cmd_path = None
self.IS_directory = None
self.input_file_path = None # input file used to parse code
self.output_file_path = None # output file where xml will be written
self.current_file_read = None
self.lexer = None
#-------------------------------------------------------------------
# iterative data structures
#-------------------------------------------------------------------
self.token_list = None
self.ITERABLE_token_list = None
self.current_token = None
self.previous_token = None
self.next_token = None
self.token_index = -1
#-------------------------------------------------------------------
# XML tree variables
#-------------------------------------------------------------------
self.xml_root = None
self.tree_list = []
#-------------------------------------------------------------------
# variables for compiling VM code
#-------------------------------------------------------------------
self.symbol_table = None
self.VMwriter = VMwriter()
def get_token_list(self):
# initialise and clean up previous iterations
self.token_list = None
self.ITERABLE_token_list = None
self.current_token = None
self.previous_token = None
self.next_token = None
self.token_index = -1
# create and store tokens
self.lexer = Lexer(self.input_file_path)
self.token_list = self.lexer.get_token_types()
self.ITERABLE_token_list = iter(self.token_list)
self.token_PEEKING_list = self.ITERABLE_token_list
return
def print_iterated_tokens(self):
print("| Current token:", self.current_token.ascii,
" | Current token type:", self.current_token.type,
"| Next token val:", self.next_token.ascii, " |")
def print_all_tokens(self):
for t in self.token_list:
print("|", "Token val: ", t.ascii, " | ", "Token type: ", t.type,
" |")
def create_xml(self):
""" Writes the tokens in XML format """
# compile all statements
self.parse()
# create tree
self.tree_list.append((self.xml_root, self.output_file_path))
return
def write_xml(self):
from xml.dom import minidom
for root in self.tree_list:
pretty_tree = self.prettify(root[0])
pretty_tree = pretty_tree[22:].lstrip()
# print(pretty_tree)
with open(root[1], "w") as f:
f.write(pretty_tree)
self.VMwriter.print_VM_code()
self.VMwriter.write_VM_code()
return
def prettify(self, elem):
"""Return a pretty-printed XML string for the Element """
# with great help from: https://stackoverflow.com/a/17402424
from xml.dom import minidom
rough_string = ET.tostring(elem, 'utf-8')
reparsed = minidom.parseString(rough_string)
return reparsed.toprettyxml(indent="\t")
def add_xml_element(self, parent_node):
ET.SubElement(parent_node, self.current_token.type
).text = ' ' + self.current_token.ascii + ' '
return
#-------------------------------------------------------------------
# fetching, checking and adding xml tokens
#-------------------------------------------------------------------
def get_token(self):
self.previous_token = self.current_token
self.current_token = next(self.ITERABLE_token_list)
self.token_index += 1
self.peek_next_token()
# self.print_iterated_tokens()
return self.current_token
def peek_next_token(self):
if self.token_index < len(self.token_list) - 1:
self.next_token = next(self.token_PEEKING_list)
self.ITERABLE_token_list = (value
for g in ([self.next_token],
self.ITERABLE_token_list)
for value in g)
return self.next_token
def consume(self,
tkn_val=[],
tkn_type=None,
parent_node=None,
ast_parent=None):
""" Consume a token of a given type and get the next token """
if len(tkn_val) > 0:
if self.current_token.ascii in tkn_val and self.current_token.type == tkn_type:
self.add_xml_element(parent_node)
self.get_token()
else:
if self.current_token.type == tkn_type:
self.add_xml_element(parent_node)
self.get_token()
return
#-------------------------------------------------------------------
# key driver: parse
#-------------------------------------------------------------------
def parse(self):
self.get_token()
# initialise key data structures
self.symbol_table = SymbolTable()
self.VMwriter.symbol_table = self.symbol_table
# begin compiling
self.compile_class()
return
#--------------------------------------------------------
# recursive descent: class
#--------------------------------------------------------
def compile_class(self):
""" 'class' className '{' classVarDec* subroutineDec* '}' """
# intialise the tree
Class_node = ET.Element("class")
self.xml_root = Class_node
#--------------------------------------------------------
# component: 'class'
self.consume(tkn_val=["class"],
tkn_type="keyword",
parent_node=Class_node)
# component: className
self.symbol_table.new_class_scope(self.current_token.ascii)
self.compile_className(parent_node=Class_node)
# component: '{'
self.consume(tkn_val=["{"], tkn_type="symbol", parent_node=Class_node)
# component: classVarDec* subroutineDec*
while not (self.next_token.type == "EOF"):
# component: classVarDec*
self.compile_classVarDec(parent_node=Class_node)
# component: subroutineDec*
self.compile_subroutineDec(parent_node=Class_node)
# component: '}'
self.consume(tkn_val=["}"], tkn_type="symbol", parent_node=Class_node)
# component: EOF
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: className
#--------------------------------------------------------
def compile_className(self, parent_node):
"""identifier"""
self.consume(tkn_val=[],
tkn_type="identifier",
parent_node=parent_node) # component: 'class'
return
#--------------------------------------------------------
# recursive descent: classVarDec
#--------------------------------------------------------
def compile_classVarDec(self, parent_node):
""" ('static' | 'field' ) type varName (',' varName)* ';' """
while self.current_token.ascii in ['static', 'field']:
# new XML parent
classVarDec_node = ET.SubElement(parent_node, "classVarDec")
#--------------------------------------------------------
# component: ('static' | 'field' )
self.symbol_table.update_class_table(self.token_index,
self.current_token.ascii,
self.previous_token.ascii,
self.next_token.ascii)
self.consume(tkn_val=[],
tkn_type="keyword",
parent_node=classVarDec_node)
# component: type
self.symbol_table.update_class_table(self.token_index,
self.current_token.ascii,
self.previous_token.ascii,
self.next_token.ascii)
self.compile_type(parent_node=classVarDec_node)
while ";" not in self.current_token.ascii:
# component: varName
self.symbol_table.update_class_table(self.token_index,
self.current_token.ascii,
self.previous_token.ascii,
self.next_token.ascii)
self.compile_varName(parent_node=classVarDec_node)
# component: ,
self.consume(tkn_val=[","],
tkn_type="symbol",
parent_node=classVarDec_node)
self.consume(tkn_val=[";"],
tkn_type="symbol",
parent_node=classVarDec_node)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: type
#--------------------------------------------------------
def compile_type(self, parent_node):
""" 'int' | 'char' | 'boolean' | className """
# component:'int' | 'char' | 'boolean'
if self.current_token.ascii in ['int', 'char', 'boolean']:
self.consume(tkn_val=['int', 'char', 'boolean'],
tkn_type="keyword",
parent_node=parent_node)
# component: | className
else:
self.compile_className(parent_node=parent_node)
return
#--------------------------------------------------------
# recursive descent: varName
#--------------------------------------------------------
def compile_varName(self, parent_node):
"""identifier"""
self.consume(tkn_val=[],
tkn_type="identifier",
parent_node=parent_node)
return
#--------------------------------------------------------
# recursive descent: subroutineName
#--------------------------------------------------------
def compile_subroutineName(self, parent_node):
"""identifier"""
self.consume(tkn_val=[],
tkn_type="identifier",
parent_node=parent_node)
return
#--------------------------------------------------------
# recursive descent: subroutineDec
#--------------------------------------------------------
def compile_subroutineDec(self, parent_node):
"""
('constructor' | 'function' | 'method') ('void' | type)
subroutineName'(' parameterList ')' subroutineBody
"""
#--------------------------------------------------------
f = open("permanent_variables.txt", "w+")
f.write(self.current_token.ascii) # write permanent variable
f = open("permanent_variables.txt", "r")
subroutine_kind = f.read() # save permanent variable
f = open("permanent_variables.txt", "w+")
f.seek(0)
f.truncate()
f.close() # delete file contents and close file
#--------------------------------------------------------
# new XML parent
subroutineDec_node = ET.SubElement(parent_node, "subroutineDec")
#--------------------------------------------------------
# component: ('constructor' | 'function' | 'method')
self.consume(tkn_val=['constructor', 'function', 'method'],
tkn_type="keyword",
parent_node=subroutineDec_node)
self.VMwriter.num_functions["if"] = -1
self.VMwriter.num_functions["while"] = -1
# component: ('void' | type)
if self.current_token.ascii == "void":
self.consume(tkn_val=["void"],
tkn_type="keyword",
parent_node=subroutineDec_node)
else:
self.compile_type(parent_node=subroutineDec_node)
# component: subroutineName
self.symbol_table.new_subroutine_scope(subroutine_kind,
self.previous_token.ascii,
self.current_token.ascii)
self.compile_subroutineName(parent_node=subroutineDec_node)
# check if list is empty (print space with closing tag if empty)
if self.current_token.ascii == "(" and self.next_token.ascii == ")":
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=subroutineDec_node)
# component: parameterList
self.compile_parameterList(empty=True,
parent_node=subroutineDec_node)
# component: ')'
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=subroutineDec_node)
else:
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=subroutineDec_node)
# component: parameterList
self.symbol_table.compiling_state = "args"
self.compile_parameterList(empty=False,
parent_node=subroutineDec_node)
# component: ')'
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=subroutineDec_node)
# component: subroutineBody
self.compile_subroutineBody(parent_node=subroutineDec_node)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: parameterList
#--------------------------------------------------------
def compile_parameterList(self, empty, parent_node):
""" : ( (type varName) (',' type varName)*)? """
# new XML parent
if empty:
parameterList_node = ET.SubElement(
parent_node, "parameterList").text = " " + "\n"
if not empty:
parameterList_node = ET.SubElement(parent_node, "parameterList")
#--------------------------------------------------------
while not (self.current_token.ascii == ")"):
# component: type
self.compile_type(parent_node=parameterList_node)
# component: varName
self.symbol_table.update_subroutine_table(
self.token_index, self.current_token.ascii,
self.previous_token.ascii, self.next_token.ascii)
self.compile_varName(parent_node=parameterList_node)
# component: ,
self.consume(tkn_val=[","],
tkn_type="symbol",
parent_node=parameterList_node)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: subroutineBody
#--------------------------------------------------------
def compile_subroutineBody(self, parent_node):
""" '{' varDec* statements '}' """
# new XML parent
subroutineBody_node = ET.SubElement(parent_node, "subroutineBody")
#--------------------------------------------------------
# component: '{'
self.consume(tkn_val=["{"],
tkn_type="symbol",
parent_node=subroutineBody_node)
# component: varDec*
self.compile_varDec(parent_node=subroutineBody_node)
self.VMwriter.writeFunction(self.symbol_table.class_name,
self.symbol_table.subroutine_name,
self.symbol_table.var_count["var"])
# component: statements
self.compile_statements(parent_node=subroutineBody_node)
# component: '}'
self.consume(tkn_val=["}"],
tkn_type="symbol",
parent_node=subroutineBody_node)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: varDec
#--------------------------------------------------------
def compile_varDec(self, parent_node):
""" 'var' type varName (',' varName)* ';' """
while self.current_token.ascii == "var":
# new XML parent
varDec_node = ET.SubElement(parent_node, "varDec")
#--------------------------------------------------------
self.symbol_table.compiling_state = "vars"
self.symbol_table.update_subroutine_table(
self.token_index, self.current_token.ascii,
self.previous_token.ascii, self.next_token.ascii)
# component: 'var'
self.consume(tkn_val=["var"],
tkn_type="keyword",
parent_node=varDec_node)
# component: type
self.symbol_table.update_subroutine_table(
self.token_index, self.current_token.ascii,
self.previous_token.ascii, self.next_token.ascii)
self.compile_type(parent_node=varDec_node)
# component: varName
self.symbol_table.update_subroutine_table(
self.token_index, self.current_token.ascii,
self.previous_token.ascii, self.next_token.ascii)
self.compile_varName(parent_node=varDec_node)
while self.current_token.ascii == ',':
# component: ','
self.consume(tkn_val=[","],
tkn_type="symbol",
parent_node=varDec_node)
# component: varName
self.symbol_table.update_subroutine_table(
self.token_index, self.current_token.ascii,
self.previous_token.ascii, self.next_token.ascii)
self.compile_varName(parent_node=varDec_node)
# component: ';'
self.consume(tkn_val=[";"],
tkn_type="symbol",
parent_node=varDec_node)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: statements
#--------------------------------------------------------
def compile_statements(self, parent_node):
""" statement* """
# new XML parent
statements_node = ET.SubElement(parent_node, "statements")
#--------------------------------------------------------
while self.current_token.ascii in [
"let", "if", "while", "do", "return"
]:
self.compile_statement(parent_node=statements_node)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: statement
#--------------------------------------------------------
def compile_statement(self, parent_node):
""" letStatement | ifStatement | whileStatement | doStatement | returnStatement """
if self.current_token.ascii == "let":
self.compile_letStatement(parent_node=parent_node)
elif self.current_token.ascii == "if":
self.compile_ifStatement(parent_node=parent_node)
elif self.current_token.ascii == "while":
self.compile_whileStatement(parent_node=parent_node)
elif self.current_token.ascii == "do":
self.compile_doStatement(parent_node=parent_node)
elif self.current_token.ascii == "return":
self.compile_returnStatement(parent_node=parent_node)
return
#--------------------------------------------------------
# recursive descent: letStatement
#--------------------------------------------------------
def compile_letStatement(self, parent_node):
""" 'let' varName ('[' expression ']')? '=' expression ';' """
# new XML parent
letStatement_node = ET.SubElement(parent_node, "letStatement")
#--------------------------------------------------------
# component: 'let'
self.consume(tkn_val=["let"],
tkn_type="keyword",
parent_node=letStatement_node)
# component:varName ('[' expression ']')?
if self.next_token.ascii == "[":
token = self.token_list[self.token_index]
self.compile_varName(
parent_node=letStatement_node) # component: varName
# component: '['
self.consume(tkn_val=["["],
tkn_type="symbol",
parent_node=letStatement_node)
# component: expression
self.compile_expression(parent_node=letStatement_node)
# component: ']'
self.consume(tkn_val=["]"],
tkn_type="symbol",
parent_node=letStatement_node)
self.VMwriter.writePush(token=token)
self.VMwriter.WriteArithmetic("+")
Array_status = True
# component: subroutineCall
else:
Array_status = False
token = self.token_list[self.token_index]
self.compile_varName(parent_node=letStatement_node)
# component: '='
self.consume(tkn_val=["="],
tkn_type="symbol",
parent_node=letStatement_node)
# component: 'expression'
self.compile_expression(parent_node=letStatement_node)
# component: component: ';'
self.consume(tkn_val=[";"],
tkn_type="symbol",
parent_node=letStatement_node)
if Array_status:
self.VMwriter.writePop(segment="temp",
index=0) # pop the expression into a temp
self.VMwriter.writePop(
segment="pointer",
index=1) # store the topmost stack element in RAM[addr]
self.VMwriter.writePush(segment="temp", index=0)
self.VMwriter.writePop(segment="that", index=0)
else:
self.VMwriter.writePop(token=token)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: doStatement
#--------------------------------------------------------
def compile_doStatement(self, parent_node):
""" 'do' subroutineCall ';' """
# new XML parent
doStatement_node = ET.SubElement(parent_node, "doStatement")
#--------------------------------------------------------
# component: 'do'
self.consume(tkn_val=["do"],
tkn_type="keyword",
parent_node=doStatement_node)
# subroutineCall
self.compile_subroutineCall(parent_node=doStatement_node)
# component: ';'
self.consume(tkn_val=[";"],
tkn_type="symbol",
parent_node=doStatement_node)
#--------------------------------------------------------
self.VMwriter.writePop(segment="temp", index=0) # return a pop temp
return
#--------------------------------------------------------
# recursive descent: returnStatement
#--------------------------------------------------------
def compile_returnStatement(self, parent_node):
""" 'return' expression? ';' """
# new XML parent
returnStatement_node = ET.SubElement(parent_node, "returnStatement")
#--------------------------------------------------------
# component: 'return'
self.consume(tkn_val=["return"],
tkn_type="keyword",
parent_node=returnStatement_node)
# component: expression?
if not self.current_token.ascii == ";":
self.compile_expression(returnStatement_node)
self.VMwriter.writeReturn(self.symbol_table.subroutine_type)
# component: ';'
self.consume(tkn_val=[";"],
tkn_type="symbol",
parent_node=returnStatement_node)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: ifStatement
#--------------------------------------------------------
def compile_ifStatement(self, parent_node):
""" 'if' '(' expression ')' '{' statements '}' ( 'else' '{' statements '}' )? """
if_count = 0
# new XML parent
ifStatement_node = ET.SubElement(parent_node, "ifStatement")
#--------------------------------------------------------
# component: 'if' '(' expression ')' '{' statements '}'
# component: 'if'
self.VMwriter.num_functions["if"] += 1
self.consume(tkn_val=["if"],
tkn_type="keyword",
parent_node=ifStatement_node)
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=ifStatement_node)
# component: expression
self.compile_expression(parent_node=ifStatement_node)
# component: ')'
self.VMwriter.WriteIf(label="IF_TRUE", function="if")
self.VMwriter.WriteGoto(label="IF_FALSE", function="if")
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=ifStatement_node)
# component: '{'
self.consume(tkn_val=["{"],
tkn_type="symbol",
parent_node=ifStatement_node)
self.VMwriter.WriteLabel(label="IF_TRUE", function="if")
# component: 'statements'
if self.current_token.ascii == "if": if_count += 1
self.compile_statements(parent_node=ifStatement_node)
# component: '}'
self.consume(tkn_val=["}"],
tkn_type="symbol",
parent_node=ifStatement_node)
self.VMwriter.WriteGoto(label="IF_END", function="if", count=if_count)
self.VMwriter.WriteLabel(label="IF_FALSE",
function="if",
count=if_count)
# component: ( 'else' '{' statements '}' )?
if self.current_token.ascii == "else":
# component: 'else'
self.consume(tkn_val=["else"],
tkn_type="keyword",
parent_node=ifStatement_node)
# component: '{'
self.consume(tkn_val=["{"],
tkn_type="symbol",
parent_node=ifStatement_node)
# component: 'statements'
if self.current_token.ascii == "if": if_count += 1
self.compile_statements(parent_node=ifStatement_node)
# component: '}'
self.consume(tkn_val=["}"],
tkn_type="symbol",
parent_node=ifStatement_node)
#--------------------------------------------------------
self.VMwriter.WriteLabel(label="IF_END", function="if", count=if_count)
return if_count
#--------------------------------------------------------
# recursive descent: whileStatement
#--------------------------------------------------------
def compile_whileStatement(self, parent_node):
""" 'while' '(' expression ')' '{' statements '}' """
while_count = 0
# new XML parent
whileStatement_node = ET.SubElement(parent_node, "whileStatement")
#--------------------------------------------------------
# component: 'while'
self.VMwriter.num_functions["while"] += 1
self.VMwriter.WriteLabel(label="WHILE_EXP", function="while")
self.consume(tkn_val=["while"],
tkn_type="keyword",
parent_node=whileStatement_node)
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=whileStatement_node)
# component: expression
self.compile_expression(whileStatement_node)
# component: ')'
self.VMwriter.WriteArithmetic("~")
self.VMwriter.WriteIf(label="WHILE_END",
function="while",
count=while_count)
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=whileStatement_node)
# component: '{'
self.consume(tkn_val=["{"],
tkn_type="symbol",
parent_node=whileStatement_node)
# component: 'statements'
if self.current_token.ascii == "while": while_count += 1
self.compile_statements(whileStatement_node)
# component: '}'
self.consume(tkn_val=["}"],
tkn_type="symbol",
parent_node=whileStatement_node)
#--------------------------------------------------------
self.VMwriter.WriteGoto(label="WHILE_EXP",
function="while",
count=while_count)
self.VMwriter.WriteLabel(label="WHILE_END",
function="while",
count=while_count)
return while_count
#--------------------------------------------------------
# recursive descent: expression
#--------------------------------------------------------
def compile_expression(self, parent_node):
""" term (op term)* """
term_count = 0
neg = False
# new XML parent
expression_node = ET.SubElement(parent_node, "expression")
#--------------------------------------------------------
if self.current_token.ascii in self.lexer.symbols.unary_op and self.previous_token.ascii in [
"=", ",", ", ", "("
]:
operator = self.current_token.ascii
# component: term
self.compile_term(parent_node=expression_node)
if operator == "-":
self.VMwriter.WriteArithmetic(operator="neg",
term_count=term_count)
else:
self.VMwriter.WriteArithmetic(operator=operator,
term_count=term_count)
else:
# component: term
self.compile_term(parent_node=expression_node)
term_count += 1
# component: term (op term)*
while (self.current_token.ascii in self.lexer.symbols.operator):
#--------------------------------------------------------
f = open("permanent_variables.txt", "w+")
f.write(self.current_token.ascii) # write permanent variable
f = open("permanent_variables.txt", "r")
operator = f.read() # save permanent variable
f = open("permanent_variables.txt", "w+")
f.seek(0)
f.truncate()
f.close() # delete file contents and close file
#--------------------------------------------------------
# component: component: op
self.consume(tkn_val=self.lexer.symbols.operator,
tkn_type="symbol",
parent_node=expression_node)
# component: term
self.compile_term(parent_node=expression_node)
term_count += 1
self.VMwriter.WriteArithmetic(operator=operator,
term_count=term_count)
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: expressionList
#--------------------------------------------------------
def compile_expressionList(self, empty, parent_node):
""" (expression (',' expression)* )? """
expression_counter = 0
# new XML parent
if empty:
expressionList_node = ET.SubElement(
parent_node, "expressionList").text = " " + "\n"
if not empty:
expressionList_node = ET.SubElement(parent_node, "expressionList")
#--------------------------------------------------------
while not (self.current_token.ascii in [")"]):
# component: expression
self.compile_expression(parent_node=expressionList_node)
expression_counter += 1
# component: ,
self.consume(tkn_val=[", ", ","],
tkn_type="symbol",
parent_node=expressionList_node)
#--------------------------------------------------------
return expression_counter
#--------------------------------------------------------
# recursive descent: term
#--------------------------------------------------------
def compile_term(self, parent_node):
"""
integerConstant | stringConstant | keywordConstant | varName |
varName '[' expression ']' | subroutineCall | '(' expression ')' | unaryOp term
"""
# new XML parent
if not self.current_token.ascii in [")", "]"]:
term_node = ET.SubElement(parent_node, "term")
#--------------------------------------------------------
if self.current_token.type == "integerConstant": # component: integerConstant
self.VMwriter.writePush(self.current_token,
segment=None,
index=None)
return self.consume(tkn_val=[],
tkn_type="integerConstant",
parent_node=term_node)
elif self.current_token.type == "stringConstant": # component: stringConstant
self.VMwriter.writePush(self.current_token,
segment=None,
index=None)
return self.consume(tkn_val=[],
tkn_type="stringConstant",
parent_node=term_node)
elif self.current_token.ascii in self.lexer.symbols.keyword_constant: # component: keywordConstant
self.VMwriter.writePush(self.current_token,
segment=None,
index=None)
return self.consume(tkn_val=[],
tkn_type="keyword",
parent_node=term_node)
elif self.current_token.type == "identifier":
# component: varName '[' expression ']'
if self.next_token.ascii == "[":
token = self.token_list[self.token_index]
self.compile_varName(
parent_node=term_node) # component: varName
# component: '['
self.consume(tkn_val=["["],
tkn_type="symbol",
parent_node=term_node)
# component: expression
self.compile_expression(parent_node=term_node)
# component: ']'
self.consume(tkn_val=["]"],
tkn_type="symbol",
parent_node=term_node)
self.VMwriter.writePush(token=token)
self.VMwriter.WriteArithmetic("+")
self.VMwriter.writePop(
segment="pointer",
index=1) # store the topmost stack element in RAM[addr]
self.VMwriter.writePush(segment="that", index=0)
return
# component: subroutineCall
elif self.next_token.ascii == "(" or self.next_token.ascii == ".":
return self.compile_subroutineCall(
parent_node=term_node) # subroutineCall
# component: varName
else:
self.VMwriter.writePush(self.current_token)
return self.compile_varName(parent_node=term_node)
elif self.current_token.ascii == "(": # '(' expression ')'
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=term_node) # component: '('
self.compile_expression(
parent_node=term_node) # component: expression
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=term_node) # component: ')'
return
# component: unaryOp term
elif self.current_token.ascii in self.lexer.symbols.unary_op:
self.consume(tkn_val=['-', '~'],
tkn_type="symbol",
parent_node=term_node) # component: unaryOp
self.compile_term(parent_node=term_node) # component: term
return
#--------------------------------------------------------
return
#--------------------------------------------------------
# recursive descent: subroutineCall
#--------------------------------------------------------
def compile_subroutineCall(self, parent_node):
"""
subroutineName '(' expressionList ')' | ( className | varName) '.' subroutineName
'(' expressionList ')'
"""
# component: subroutineName '(' expressionList ')'
if self.next_token.ascii == "(":
#--------------------------------------------------------
f = open("permanent_variables.txt", "w+")
f.write(self.current_token.ascii) # write permanent variable
f = open("permanent_variables.txt", "r")
subroutineName = f.read() # save permanent variable
f = open("permanent_variables.txt", "w+")
f.seek(0)
f.truncate()
f.close() # delete file contents and close file
#--------------------------------------------------------
# component: subroutineName
self.compile_subroutineName(parent_node=parent_node)
# check if list is empty (print space with closing tag if empty)
if (self.current_token.ascii == "(") and (self.next_token.ascii
== ")"):
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=parent_node)
# component: expressionList
nArgs = self.compile_expressionList(empty=True,
parent_node=parent_node)
# component: ')'
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=parent_node)
self.VMwriter.writeCall(subroutineName=subroutineName,
nArgs=nArgs)
else:
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=parent_node)
# component: expressionList
nArgs = self.compile_expressionList(empty=False,
parent_node=parent_node)
# component: ')'
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=parent_node)
self.VMwriter.writeCall(subroutineName=subroutineName,
nArgs=nArgs)
# component: ( className | varName) '.' subroutineName '(' expressionList ')'
if self.next_token.ascii == ".":
#--------------------------------------------------------
f = open("permanent_variables.txt", "w+")
f.write(self.current_token.ascii) # write permanent variable
f = open("permanent_variables.txt", "r")
className = f.read() # save permanent variable
f = open("permanent_variables.txt", "w+")
f.seek(0)
f.truncate()
f.close() # delete file contents and close file
#--------------------------------------------------------
# component: ( className | varName)
self.consume(tkn_val=[],
tkn_type="identifier",
parent_node=parent_node)
# component: '.'
self.consume(tkn_val=["."],
tkn_type="symbol",
parent_node=parent_node)
#--------------------------------------------------------
f = open("permanent_variables.txt", "w+")
f.write(self.current_token.ascii) # write permanent variable
f = open("permanent_variables.txt", "r")
subroutineName = f.read() # save permanent variable
f = open("permanent_variables.txt", "w+")
f.seek(0)
f.truncate()
f.close() # delete file contents and close file
#--------------------------------------------------------
# component: subroutineName
self.compile_subroutineName(parent_node=parent_node)
# check if list is empty (print space with closing tag if empty)
if (self.current_token.ascii == "(") and (self.next_token.ascii
== ")"):
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=parent_node)
# component: expressionList
nArgs = self.compile_expressionList(empty=True,
parent_node=parent_node)
# component: ')'
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=parent_node)
self.VMwriter.writeCall(className=className,
subroutineName=subroutineName,
nArgs=nArgs)
else:
# component: '('
self.consume(tkn_val=["("],
tkn_type="symbol",
parent_node=parent_node)
# component: expressionList
nArgs = self.compile_expressionList(empty=False,
parent_node=parent_node)
# component: ')'
self.consume(tkn_val=[")"],
tkn_type="symbol",
parent_node=parent_node)
self.VMwriter.writeCall(className=className,
subroutineName=subroutineName,
nArgs=nArgs)
#--------------------------------------------------------
return
def assemble():
logging.debug(sys.argv)
if (len(sys.argv) != 2) or (not sys.argv[1].endswith(".asm")):
raise Exception("Usage: {} src_file".format(__file__))
parser = Parser.Parser(sys.argv[1])
code = Code.Code()
symbol_table = SymbolTable.SymbolTable()
dst_file = open(re.sub("\.asm$", ".hack", sys.argv[1]), "w")
# 1st Path
## L_Symbol
PC = 0
while parser.advance():
cmd_type = parser.commandType()
if cmd_type is parser.A_COMMAND:
PC += 1
elif cmd_type is parser.L_COMMAND:
symbol = parser.symbol()
if not symbol_table.contains(symbol):
symbol_table.addEntry(symbol, PC)
else:
raise Exception("Error: Dual Definition of l_symbol: {}".format(symbol))
elif cmd_type is parser.C_COMMAND:
PC += 1
else:
raise Exception("Error")
parser = Parser.Parser(sys.argv[1])
# 2nd Path
while parser.advance():
cmd_type = parser.commandType()
logging.debug("cmd_type: {}".format(cmd_type))
if cmd_type is parser.A_COMMAND:
symbol = parser.symbol()
try:
const_num = int(symbol)
ostr = "{:016b}\n".format(const_num)
logging.debug("output: {}".format(ostr))
dst_file.write(ostr)
except ValueError:
if symbol_table.contains(symbol):
address = symbol_table.getAddress(symbol)
ostr = "{:016b}\n".format(address)
dst_file.write(ostr)
else:
# new local varialble
address = symbol_table.addLocalVar(symbol)
ostr = "{:016b}\n".format(address)
dst_file.write(ostr)
elif cmd_type is parser.L_COMMAND:
pass
elif cmd_type is parser.C_COMMAND:
dest = parser.dest()
comp = parser.comp()
jump = parser.jump()
logging.debug("dest: {}, comp: {}, jump: {}".format(dest, comp, jump))
ostr = "111{comp}{dest}{jump}\n".format( \
comp=code.comp(comp), dest=code.dest(dest), jump=code.jump(jump))
logging.debug("output: {}".format(ostr))
dst_file.write(ostr)
else:
raise Exception("Error")
dst_file.close()
def __init__(self, filename):
self.symbolTable = SymbolTable.SymbolTable()
self.code = Code.Code()
self.filename = filename
self.outputFile = open(self.filename.replace('.asm', '.hack'), 'w')
class CompilationEngine:
OP_DICT_BIN = {
'+': 'add',
'-': 'sub',
'=': 'eq',
'>': 'gt',
'<': 'lt',
'&': 'and',
'|': 'or'
}
OP_DICT_UN = {'-': 'neg', '~': 'not'}
KEYWORD_DICT = {
'true': ('constant', -1),
'false': ('constant', 0),
'null': ('constant', 0),
'this': ('pointer', 0)
}
VAR_DICT = {
'static': 'static',
'field': 'this',
'var': 'local',
'argument': 'argument'
}
def __init__(self, tokenizer, output):
"""Creates a new compilation engine with the given input and output.
The next routine called must be compileClass(). """
self.tokenizer = tokenizer
self.tags = []
self.scope = 0
self.writer = VMWriter(output)
self.class_table = SymbolTable()
self.method_table = SymbolTable()
self.class_name = ''
self.method_or_constructor = False
def compile_class(self):
"""Compiles a complete class."""
self.tokenizer.advance() # class
self.class_name = self.tokenizer.get_token() # class name
self.tokenizer.advance()
self.tokenizer.advance() # {
while self.tokenizer.get_token() == 'static' or \
self.tokenizer.get_token() == 'field':
self.compile_class_var_dec()
while self.tokenizer.get_token() == 'constructor' or \
self.tokenizer.get_token() == 'function' or \
self.tokenizer.get_token() == 'method':
self.compile_subroutine()
self.tokenizer.advance() # }
self.writer.close()
self.writer.close()
return
def compile_class_var_dec(self):
"""Compiles a static declaration or a field declaration. """
kind = self.tokenizer.get_token() # var
self.tokenizer.advance()
var_type = self.tokenizer.get_token() # type
self.tokenizer.advance()
name = self.tokenizer.get_token() # var name
self.class_table.define(name, var_type, kind)
self.tokenizer.advance()
while self.tokenizer.get_token() == ',':
self.tokenizer.advance() # ,
name = self.tokenizer.get_token() # var name
self.class_table.define(name, var_type, kind)
self.tokenizer.advance() # var name
self.tokenizer.advance() # ;
return
def compile_subroutine(self):
"""Compiles a complete method, function, or constructor. """
func_type = self.tokenizer.get_token() # method/function/constructor
self.tokenizer.advance()
self.tokenizer.advance() # type/void
func_name = self.tokenizer.get_token() # subroutineName
self.tokenizer.advance() # (
self.tokenizer.advance()
self.method_table.start_subroutine()
if func_type == 'method':
self.method_or_constructor = True
self.method_table.define('this', self.class_name, 'argument')
self.compile_parameter_list()
num_locals = 0
self.tokenizer.advance() # {
while self.tokenizer.get_token() == 'var':
num_locals += self.compile_var_dec()
self.writer.write_function(self.class_name + '.' + func_name,
num_locals)
self.writer.write_push('argument', 0)
self.writer.write_pop('pointer', 0)
elif func_type == 'function':
self.method_or_constructor = False
self.compile_parameter_list()
num_locals = 0
self.tokenizer.advance() # {
while self.tokenizer.get_token() == 'var':
num_locals += self.compile_var_dec()
self.writer.write_function(self.class_name + '.' + func_name,
num_locals)
elif func_type == 'constructor':
self.method_or_constructor = True
self.compile_parameter_list()
num_locals = 0
self.tokenizer.advance() # {
while self.tokenizer.get_token() == 'var':
num_locals += self.compile_var_dec()
self.writer.write_function(self.class_name + '.' + func_name,
num_locals)
self.writer.write_push('constant',
self.class_table.var_count('field'))
self.writer.write_call('Memory.alloc', 1)
self.writer.write_pop('pointer', 0)
self.compile_subroutine_body()
return
def compile_subroutine_body(self):
"""Compiles the subroutine's body - the statements. """
self.compile_statements()
self.tokenizer.advance() # }
return
def compile_parameter_list(self):
"""Compiles a (possibly empty) parameter list, not including the
enclosing . """
if self.tokenizer.get_token() == ')':
self.tokenizer.advance() # )
return 0
var_type = self.tokenizer.get_token() # type
self.tokenizer.advance()
name = self.tokenizer.get_token() # var name
self.tokenizer.advance()
num = 1
self.method_table.define(name, var_type, 'argument')
while self.tokenizer.get_token() == ',':
self.tokenizer.advance() # ,
var_type = self.tokenizer.get_token() # type
self.tokenizer.advance()
name = self.tokenizer.get_token() # var nam
self.tokenizer.advance()
num += 1
self.method_table.define(name, var_type, 'argument')
self.tokenizer.advance() # )
return num
def compile_var_dec(self):
"""Compiles a var declaration. """
var = self.tokenizer.get_token() # var
self.tokenizer.advance()
var_type = self.tokenizer.get_token() # type
self.tokenizer.advance()
name = self.tokenizer.get_token() # var name
self.method_table.define(name, var_type, var)
self.tokenizer.advance()
num_vars = 1
while self.tokenizer.get_token() == ',':
num_vars += 1
self.tokenizer.advance() # ,
name = self.tokenizer.get_token() # var name
self.method_table.define(name, var_type, var)
self.tokenizer.advance() # var name
self.tokenizer.advance() # ;
return num_vars
def compile_statements(self):
"""Compiles a sequence of statements, not including the enclosing . """
current_token = self.tokenizer.get_token()
while current_token == 'let' or current_token == 'if' or \
current_token == 'while' or current_token == 'do' \
or current_token == 'return':
if current_token == 'let':
self.compile_let()
elif current_token == 'if':
self.compile_if()
elif current_token == 'while':
self.compile_while()
elif current_token == 'do':
self.compile_do()
elif current_token == 'return':
self.compile_return()
current_token = self.tokenizer.get_token()
return
def compile_do(self):
"""Compiles a do statement. """
self.tokenizer.advance() # do
name = self.tokenizer.get_token()
self.tokenizer.advance() # function name
if self.tokenizer.get_token() == '(':
name = self.class_name + '.' + name # *************************
self.writer.write_comment('//function call')
self.compile_subroutine_call(name, False)
elif self.tokenizer.get_token() == '.':
self.writer.write_comment('//function object call')
if name in self.method_table.symbol_table:
self.compile_var_name(name)
elif name in self.class_table.symbol_table:
self.compile_var_name(name)
self.compile_subroutine_call(name, True)
self.tokenizer.advance() # ;
self.writer.write_pop('temp', 0)
return
def compile_let(self):
"""Compiles a let statement. """
self.writer.write_comment('//let statement')
self.tokenizer.advance() # let
name = self.tokenizer.get_token() # var name
self.tokenizer.advance()
if self.tokenizer.get_token() == '[':
self.compile_var_name(name)
self.tokenizer.advance() # [
self.compile_expression()
self.writer.write_arithmetic('add')
self.tokenizer.advance() # ]
self.tokenizer.advance() # =
self.compile_expression()
self.writer.write_pop('temp', 0)
self.writer.write_pop('pointer', 1)
self.writer.write_push('temp', 0)
self.writer.write_pop('that', 0)
else:
self.tokenizer.advance() # = symbol
self.compile_expression()
self.compile_pop_var_name(name)
self.tokenizer.advance() # ;
return
def compile_while(self):
"""Compiles a while statement. """
self.writer.write_comment('//while statement')
self.tokenizer.advance() # while
num_while = str(self.tokenizer.current_token)
self.writer.write_label('while' + num_while)
self.tokenizer.advance() # (
self.compile_expression()
self.writer.write_arithmetic('not')
self.tokenizer.advance() # )
end_num = str(self.tokenizer.current_token)
self.writer.write_if('end' + end_num)
self.tokenizer.advance() # {
self.compile_statements()
self.tokenizer.advance() # }
self.writer.write_go_to('while' + num_while)
self.writer.write_label('end' + end_num)
return
def compile_return(self):
"""Compiles a return statement. """
self.writer.write_comment('//return statement')
self.tokenizer.advance() # return
if self.tokenizer.get_token() != ';':
self.compile_expression()
else:
self.writer.write_push('constant', 0)
self.writer.write_return()
self.tokenizer.advance() # ;
return
def compile_if(self):
"""Compiles an if statement, possibly with a trailing else clause. """
self.writer.write_comment('//if statement')
self.tokenizer.advance() # if
self.tokenizer.advance() # (
self.compile_expression()
self.writer.write_arithmetic('not')
self.tokenizer.advance() # )
else_num = str(self.tokenizer.current_token)
self.writer.write_if('else' + else_num)
self.tokenizer.advance() # {
self.compile_statements()
end_num = str(self.tokenizer.current_token)
self.writer.write_go_to('end' + end_num)
self.tokenizer.advance() # }
self.writer.write_label('else' + else_num)
if self.tokenizer.get_token() == 'else':
self.tokenizer.advance() # else
self.tokenizer.advance() # {
self.compile_statements()
self.tokenizer.advance() # }
self.writer.write_label('end' + end_num)
return
def compile_expression(self):
"""Compiles an expression. """
self.compile_term()
while self.tokenizer.operator():
bin_op = self.tokenizer.get_token()
self.tokenizer.advance()
self.compile_term()
if bin_op == '*':
self.writer.write_multiply()
elif bin_op == '/':
self.writer.write_divide()
else:
self.writer.write_arithmetic(self.OP_DICT_BIN[bin_op])
return
def compile_term(self):
"""Compiles a term. """
if self.tokenizer.int_val():
self.writer.write_push('constant', self.tokenizer.get_token())
self.tokenizer.advance()
elif self.tokenizer.string_val():
self.writer.write_string(self.tokenizer.get_token())
self.tokenizer.advance()
elif self.tokenizer.keyword_constant():
self.compile_keyword_const()
elif self.tokenizer.identifier():
name = self.tokenizer.get_token()
self.tokenizer.advance()
if self.tokenizer.get_token() == '[':
self.tokenizer.advance() # '['
self.compile_array(name)
elif self.tokenizer.get_token() == '(':
self.writer.write_comment('//function call')
self.compile_subroutine_call(name, False)
elif self.tokenizer.get_token() == '.':
self.writer.write_comment('//function object call')
self.compile_subroutine_call(name, True)
else:
self.compile_var_name(name)
elif self.tokenizer.unary_op():
unary_op = self.tokenizer.get_token()
self.tokenizer.advance()
self.compile_term()
self.compile_un_op(unary_op)
elif self.tokenizer.get_token() == '(':
self.tokenizer.advance() # (
self.compile_expression()
self.tokenizer.advance() # )
return
def compile_expression_list(self):
"""Compiles a (possibly empty) comma-separated list of expressions. """
if self.tokenizer.get_token() == ')':
return 0
self.compile_expression()
num = 1
while self.tokenizer.get_token() == ',':
self.tokenizer.advance()
self.compile_expression()
num += 1
return num
def compile_bin_op(self, operator):
"""compiles a binary operator"""
self.writer.write_arithmetic(self.OP_DICT_BIN[operator])
def compile_un_op(self, operator):
"""compiles an unary operator"""
self.writer.write_arithmetic(self.OP_DICT_UN[operator])
def compile_keyword_const(self):
"""compiles a keyword constant"""
if self.tokenizer.get_token() == 'true':
self.writer.write_push('constant', 1)
self.writer.write_arithmetic('neg')
else:
self.writer.write_push(
self.KEYWORD_DICT[self.tokenizer.get_token()][0],
self.KEYWORD_DICT[self.tokenizer.get_token()][1])
self.tokenizer.advance()
def compile_var_name(self, name):
"""compile a identifier push command"""
if name in self.method_table.symbol_table:
self.writer.write_push(
self.VAR_DICT[self.method_table.kind_of(name)],
self.method_table.index_of(name))
else:
self.writer.write_push(
self.VAR_DICT[self.class_table.kind_of(name)],
self.class_table.index_of(name))
def compile_pop_var_name(self, name):
"""compile a identifier pop command"""
if name in self.method_table.symbol_table:
self.writer.write_pop(
self.VAR_DICT[self.method_table.kind_of(name)],
self.method_table.index_of(name))
else:
self.writer.write_pop(
self.VAR_DICT[self.class_table.kind_of(name)],
self.class_table.index_of(name))
def compile_array(self, name):
"""compiles an array operation"""
self.compile_expression()
self.tokenizer.advance() # ']'
self.compile_var_name(name)
self.writer.write_arithmetic('add')
self.writer.write_pop('pointer', 1)
self.writer.write_push('that', 0)
def compile_subroutine_call(self, name, obj):
"""compiles a subroutine call. obj is true if the call command was:
obj_name.func_name(), and false if the call command was func_name() """
var_type = ''
if obj:
if name in self.method_table.symbol_table:
self.compile_var_name(name)
var_type = self.method_table.type_of(name)
self.tokenizer.advance()
name = self.tokenizer.get_token()
self.tokenizer.advance()
elif name in self.class_table.symbol_table:
self.compile_var_name(name)
var_type = self.class_table.type_of(name)
self.tokenizer.advance()
name = self.tokenizer.get_token()
self.tokenizer.advance()
elif self.tokenizer.get_token() == '.':
self.tokenizer.advance()
name += '.' + self.tokenizer.get_token()
self.tokenizer.advance()
else:
self.tokenizer.advance()
if obj:
self.tokenizer.advance() # (
else:
self.writer.write_push('pointer', 0)
num_args = self.compile_expression_list()
#todo 11/27 could be problematic for the case 'do Output.printInt(1 + (2 * 3));'
if var_type:
num_args += 1
name = var_type + '.' + name
if not obj and self.method_or_constructor:
num_args += 1
self.writer.write_call(name, num_args)
self.tokenizer.advance()
def ExtractRec(Record):
#Record must be tuple (<token>,<name/token>)
#retrieves the memory location for the symbol (variable)
Display("ExtractRec", _list)
return SymbolTable.getLocationString(Record)
def CompileTerm(tokens):
global fpw,pos
# if exp is a number
if JackTokenizer.findIntConst.match((tokens[pos])): # integer constant
fpw.write('push constant '+tokens[pos]+'\n')
pos += 1
# exp is string constant,string constant, using os routine String.append(nextchar)
elif JackTokenizer.findStrConst.match((tokens[pos])):
#print('StrConst: %s' %tokens[pos])
size = len(tokens[pos])-2
fpw.write('push constant '+str(size)+'\n')
fpw.write('call String.new 1\n')
for ch in tokens[pos]:
if ch != r'"':
fpw.write('push constant '+str(ord(ch))+'\n')
fpw.write('call String.appendChar 2\n')
pos += 1
# sub exp, recursively compile it
elif tokens[pos] == '(':
pos += 1
CompileExpression(tokens)
#')'
pos += 1 # jump off ')'
# unary term
elif tokens[pos] in ['-','~']:
op = tokens[pos]
pos += 1
CompileTerm(tokens)
if op == '-':
fpw.write('neg\n')
if op == '~':
fpw.write('not\n')
#pos += 1
# keyword constant
elif JackTokenizer.findKeyword.match((tokens[pos])):
if tokens[pos] == 'true':
fpw.write('push constant 0\n')
fpw.write('not\n')
elif tokens[pos] in ['null','false']:
fpw.write('push constant 0\n')
elif tokens[pos] == 'this':
fpw.write('push pointer 0\n')
pos += 1
# an variable, simply push it
elif JackTokenizer.findIdentifier.match(tokens[pos]) and (tokens[pos+1] not in ['.','[','(']):
varName = tokens[pos]
kind = SymbolTable.kindOf(varName)
index = SymbolTable.indexOf(varName)
if kind == 'var':
fpw.write('push local '+ str(index)+'\n')
elif kind == 'field':
fpw.write('push this '+ str(index)+'\n')
else:
fpw.write('push ' + kind+' '+str(index)+ ' \n')
pos += 1
# a[], a(), a.b(), array, subroutine call
else:
# array
if tokens[pos+1] == '[':
varName = tokens[pos]
kind = SymbolTable.kindOf(varName)
index = SymbolTable.indexOf(varName)
# push base address onto stack
if kind == 'var':
fpw.write('push local '+ str(index)+'\n')
elif kind == 'field':
fpw.write('push this '+ str(index)+'\n')
else:
fpw.write('push '+kind+' '+str(index)+' \n')
pos += 2 # compile expresion in [exp]
CompileExpression(tokens)
# add these two parts, then get a target address
fpw.write('add\n')
fpw.write('pop pointer 1\n')
fpw.write('push that 0\n') # put the value of x[k] on to stack
pos += 1
# subroutine call
else:
subroutineCall(tokens)
def CompileSubroutine(self):
#initializiing function symbol table and helper variable
self.isVoid = False
self.function_sym_table = SymbolTable.SymbolTable()
if not (self.tokenizer.tokenType() == Config.TType.KEYWORD
and self.tokenizer.keyword()
in ["constructor", "function", "method"]):
raise Exception(
"Syntax Error; expected \"constructor\",\"function\" or \"method\" or class instead of:"
+ self.tokenizer.currentToken)
#identifier
subroutine_type = self.tokenizer.tokenType()
self.tokenizer.advance()
if self.tokenizer.tokenType(
) == Config.TType.KEYWORD and self.tokenizer.keyword() in [
"int", "char", "boolean"
]:
pass
elif self.tokenizer.tokenType(
) == Config.TType.KEYWORD and self.tokenizer.keyword() == "void":
self.isVoid = True
elif self.tokenizer.tokenType() == Config.TType.IDENTIFIER:
pass
else:
raise Exception(
"Syntax Error; expected void, primitive type or class instead of:"
+ self.tokenizer.currentToken)
self.tokenizer.advance()
if not (self.tokenizer.tokenType() == Config.TType.IDENTIFIER):
raise Exception("Syntax Error; expected identifier instead of:" +
self.tokenizer.currentToken)
tmp_name = self.tokenizer.currentToken
if self.isVoid:
self.void_functions.append(self.class_name + "." + tmp_name)
self.tokenizer.advance()
if not (self.tokenizer.tokenType() == Config.TType.SYMBOL
and self.tokenizer.symbol() == "("):
raise Exception("Syntax Error; expected ( instead of: " +
self.tokenizer.currentToken)
self.tokenizer.advance()
self.CompileParameterList()
if not (self.tokenizer.tokenType() == Config.TType.SYMBOL
and self.tokenizer.symbol() == ")"):
raise Exception("Syntax Error; expected ) instead of: " +
self.tokenizer.currentToken)
self.tokenizer.advance()
if not (self.tokenizer.tokenType() == Config.TType.SYMBOL
and self.tokenizer.symbol() == "{"):
raise Exception("Syntax Error; expected { instead of: " +
self.tokenizer.currentToken)
self.tokenizer.advance()
self.varCount = 0
while self.tokenizer.tokenType(
) == Config.TType.KEYWORD and self.tokenizer.keyword() == "var":
self.CompileVarDec()
if subroutine_type == "method":
self.varCount = self.varCount + 1
self.out.WriteFunction(self.class_name + "." + tmp_name,
self.varCount)
self.out.writePop("pointer", 0)
elif subroutine_type == "constructor":
#TODO
pass
else:
self.out.WriteFunction(self.class_name + "." + tmp_name,
self.varCount)
self.CompileStatements()
if not (self.tokenizer.tokenType() == Config.TType.SYMBOL
and self.tokenizer.symbol() == "}"):
raise Exception("Syntax Error; expected } instead of: " +
self.tokenizer.currentToken)
self.tokenizer.advance()
def symbolToBinary(symbolString):
if st.contains(symbolString):
symbol = st.getAddress(symbolString)
else:
symbol = int(symbolString)
return decimalToBinary(symbol, 15)
def toBinary(decNum):
num = int(decNum)
ans = ""
while (num > 0):
ans = str(num % 2) + ans
num = num / 2
return ans
while Parser.hasMoreCommands():
Parser.advance()
if Parser.commandType() is "L_COMMAND":
SymbolTable.addEntry(Parser.symbol(), Parser.current)
Parser.lines.pop(Parser.current)
Parser.current -= 1
Parser.current = -1
while Parser.hasMoreCommands():
Parser.advance()
if Parser.commandType() is "A_COMMAND":
if Parser.symbol().isdigit():
bin = toBinary(Parser.symbol())
print "0" * (16 - len(bin)) + bin
else:
if SymbolTable.contains(Parser.symbol()):
bin = toBinary(SymbolTable.getAddress(Parser.symbol()))
print "0" * (16 - len(bin)) + bin