def translateFile(self, filename):
""" Translates a single .vm file to a .asm file """
parser = Parser(filename)
self.codeWriter.setFileName(os.path.basename(filename).replace(".vm", ""))
while parser.hasMoreCommands():
parser.advance()
command = parser.commandType()
if command == parser.C_ARITHMETIC:
self.codeWriter.writeArithmetic(parser.arg1())
elif command == parser.C_PUSH or command == parser.C_POP:
self.codeWriter.writePushPop(parser.command[0], parser.arg1(), parser.arg2())
elif command == parser.C_LABEL:
self.codeWriter.writeLabel(parser.arg1())
elif command == parser.C_GOTO:
self.codeWriter.writeGoTo(parser.arg1())
elif command == parser.C_IF:
self.codeWriter.writeIf(parser.arg1())
elif command == parser.C_FUNCTION:
self.codeWriter.writeFunction(parser.arg1(), parser.arg2())
elif command == parser.C_CALL:
self.codeWriter.writeCall(parser.arg1(), parser.arg2())
elif command == parser.C_RETURN:
self.codeWriter.writeReturn()
parser.close()
def secondPass(self):
""" Converts commands from Hack assembly to binary instructions """
parser = Parser(self.inFile)
code = Code()
address = 16
try:
output = open(self.outFile, 'wb')
except IOError:
print "Unable to open output file"
exit(-2)
while parser.hasMoreCommands():
parser.advance()
command = parser.commandType()
if command is parser.A_COMMAND:
# If the command is an A instruction, write the symbol's
# binary number to the output file
symbol = parser.symbol()
toWrite = '0'
# Get decimal number to write
if symbol.isdigit():
symbol = bin(int(symbol))[2:]
else:
if not symbol in self.symbols:
# If A instruction create temporary variable
self.symbols[symbol] = address
address = address + 1
symbol = bin(self.symbols[symbol])[2:]
# Add 0s until the length is appropriate
toWrite = toWrite + symbol
toWrite = toWrite.zfill(16)
# Write to output file
output.write(toWrite+'\n')
elif command is parser.C_COMMAND:
# If the command is a C instruction, write
# dest, comp and jump to the output file
# Write first 3 bits
output.write('111')
# Write 'a' bit
comp = parser.comp()
if comp.find('M') is not -1:
output.write('1')
else:
output.write('0')
# Write 'comp', 'dest' and 'jump' bits
output.write(code.comp(comp))
output.write(code.dest(parser.dest()))
output.write(code.jump(parser.jump()))
output.write('\n')
parser.close()
def translateFile(self, filename):
""" Translates a single .vm file to a .asm file """
parser = Parser(filename)
self.codeWriter.setFileName(os.path.basename(filename).replace('.vm', ""))
while parser.hasMoreCommands():
parser.advance()
command = parser.commandType()
if command == parser.C_ARITHMETIC:
self.codeWriter.writeArithmetic(parser.arg1())
elif command == parser.C_PUSH or command == parser.C_POP:
self.codeWriter.writePushPop(parser.command[0], parser.arg1(), parser.arg2())
parser.close()
def firstPass(self):
""" Adds all user-defined symbols to symbols dictionary """
parser = Parser(self.inFile)
commandLine = 0
while parser.hasMoreCommands():
parser.advance()
command = parser.commandType()
if command is parser.L_COMMAND:
newSymbol = parser.symbol()
if not newSymbol in self.symbols:
self.symbols[newSymbol] = commandLine
elif command is parser.C_COMMAND or command is parser.A_COMMAND:
# If C instruction add 1 to the # of commands
commandLine = commandLine + 1
parser.close()
