def decode(singlefile):
print(singlefile)
with open(singlefile, 'r') as f:
name = os.path.basename(singlefile).split('.')[0]
asmname = os.path.join(os.path.dirname(singlefile), "%s.asm" % name)
asm = open(asmname, 'w')
print(asmname)
print()
n = 0
while True:
line = f.readline()
if line == '':
break
line = parser.removeun(line)
if line == '':
continue
n += 1
line = parser.removeun(line)
command = line.split()[0]
ctype = parser.commandType(command)
a1 = parser.arg1(line, ctype)
if ctype == 'C_ARITHMETIC':
code = writeArithmetic(command)
if command in ['eq', 'gt', 'lt']:
code = code % (n, n, n, n, n, n, n)
elif ctype == 'C_PUSH' or ctype == "C_POP":
a2 = parser.arg2(line)
code = writepushpop(name, command, a1, a2)
asm.write("%s\n" % code)
asm.close()
def getASM(self, parser, code_writer):
CT = parser.commandType()
if CT == parser.C_ARITHMETIC:
# print(parser.arg1())
code_writer.writeArithmetic(parser.arg1())
elif CT == parser.C_PUSH or CT == parser.C_POP:
# print (parser.arg1(), parser.arg2())
code_writer.writePushPop(CT, parser.arg1(), parser.arg2())
elif CT == parser.C_LABEL:
# print(parser.arg1())
code_writer.writeLabel(parser.arg1())
elif CT == parser.C_GOTO:
# print(parser.arg1())
code_writer.writeGoTo(parser.arg1())
elif CT == parser.C_IF:
# print(parser.arg1())
code_writer.writeIf(parser.arg1())
elif CT == parser.C_RETURN:
# print("return")
code_writer.writeReturn()
elif CT == parser.C_FUNCTION:
# print(parser.arg1(), parser.arg2())
code_writer.writeFunction(parser.arg1(), parser.arg2())
elif CT == parser.C_CALL:
# print(parser.arg1(), parser.arg2())
code_writer.writeCall(parser.arg1(), parser.arg2())
def write_push_pop():
base = arg1()
if base == 'static':
f.write('@16' + '\n')
f.write('D=A' + '\n')
elif base == 'local':
f.write('@LCL' + '\n')
f.write('D=M' + '\n')
elif base == 'argument':
f.write('@ARG' + '\n')
f.write('D=M' + '\n')
elif base == 'this':
f.write('@THIS' + '\n')
f.write('D=M' + '\n')
elif base == 'that':
f.write('@THAT' + '\n')
f.write('D=M' + '\n')
elif base == 'constant':
f.write('@SP' + '\n')
f.write('D=A' + '\n')
elif base == 'temp':
f.write('@5' + '\n')
f.write('D=A' + '\n')
f.write('@R13' + '\n')
f.write('M=D' + '\n')
index = arg2()
f.write('@' + index + '\n')
f.write('D=A' + '\n')
f.write('@R13' + '\n')
f.write('M=M+D' + '\n')
command = command_type()
if command == 'C_PUSH':
f.write('D=M' + '\n')
if base != 'constant':
f.write('A=D' + '\n')
f.write('D=M' + '\n')
f.write('@SP' + '\n')
f.write('M=M+1' + '\n')
f.write('A=M-1' + '\n')
f.write('M=D' + '\n')
else: # (if command == 'C_POP')
f.write('@SP' + '\n')
f.write('M=M-1' + '\n')
f.write('A=M+1' + '\n')
f.write('D=M' + '\n')
f.write('@R13' + '\n')
f.write('A=M' + '\n')
f.write('M=D' + '\n')
def write_push_pop () :
base = arg1()
if base == 'static' :
f.write('@16' + '\n')
f.write('D=A' + '\n')
elif base == 'local' :
f.write('@LCL' + '\n')
f.write('D=M' + '\n')
elif base == 'argument' :
f.write('@ARG' + '\n')
f.write('D=M' + '\n')
elif base == 'this' :
f.write('@THIS' + '\n')
f.write('D=M' + '\n')
elif base == 'that' :
f.write('@THAT' + '\n')
f.write('D=M' + '\n')
elif base == 'constant' :
f.write('@SP' + '\n')
f.write('D=A' + '\n')
elif base == 'temp' :
f.write('@5' + '\n')
f.write('D=A' + '\n')
f.write('@R13' + '\n')
f.write('M=D' + '\n')
index = arg2()
f.write('@' + index + '\n')
f.write('D=A' + '\n')
f.write('@R13' + '\n')
f.write('M=M+D' + '\n')
command = command_type()
if command == 'C_PUSH' :
f.write('D=M' + '\n')
if base != 'constant' :
f.write('A=D' + '\n')
f.write('D=M' + '\n')
f.write('@SP' + '\n')
f.write('M=M+1' + '\n')
f.write('A=M-1' + '\n')
f.write('M=D' + '\n')
else : # (if command == 'C_POP')
f.write('@SP' + '\n')
f.write('M=M-1' + '\n')
f.write('A=M+1' + '\n')
f.write('D=M' + '\n')
f.write('@R13' + '\n')
f.write('A=M' + '\n')
f.write('M=D' + '\n')
def write_arithmetic():
command = arg1()
# (if command operates on single value)
if command == 'not' or command == 'neg':
f.write('@SP' + '\n')
f.write('A=M' + '\n')
if command == 'not':
f.write('M=!M' + '\n')
else:
f.write('M=-M' + '\n')
else: # (if command operates on two values)
f.write('@SP' + '\n')
f.write('M=M-1' + '\n')
f.write('A=M+1' + '\n')
f.write('D=M' + '\n')
f.write('A=A-1' + '\n')
if command == 'add':
f.write('M=M+D' + '\n')
elif command == 'sub':
f.write('M=M-D' + '\n')
elif command == 'and':
f.write('M=M&D' + '\n')
elif command == 'or':
f.write('M=M|D' + '\n')
else: # (if operation is comparative)
f.write('D=M-D' + '\n')
global set_true_count, continue_count
f.write('@SET_TRUE.' + str(set_true_count) + '\n')
if command == 'eq':
f.write('D;JEQ' + '\n')
if command == 'gt':
f.write('D;JGT' + '\n')
if command == 'lt':
f.write('D;JLT' + '\n')
f.write('@SP' + '\n')
f.write('A=M' + '\n')
f.write('M=0' + '\n')
f.write('@CONTINUE.' + str(continue_count) + '\n')
f.write('0;JMP' + '\n')
f.write('(SET_TRUE.' + str(set_true_count) + ')' + '\n')
f.write('@SP' + '\n')
f.write('A=M' + '\n')
f.write('M=1' + '\n')
f.write('(CONTINUE.' + str(continue_count) + ')' + '\n')
set_true_count += 1
continue_count += 1
def write_arithmetic () :
command = arg1()
# (if command operates on single value)
if command == 'not' or command == 'neg' :
f.write('@SP' + '\n')
f.write('A=M' + '\n')
if command =='not' :
f.write('M=!M' + '\n')
else :
f.write('M=-M' + '\n')
else : # (if command operates on two values)
f.write('@SP' + '\n')
f.write('M=M-1' + '\n')
f.write('A=M+1' + '\n')
f.write('D=M' + '\n')
f.write('A=A-1' + '\n')
if command == 'add' :
f.write('M=M+D' + '\n')
elif command == 'sub' :
f.write('M=M-D' + '\n')
elif command == 'and' :
f.write('M=M&D' + '\n')
elif command == 'or' :
f.write('M=M|D' + '\n')
else : # (if operation is comparative)
f.write('D=M-D' + '\n')
global set_true_count, continue_count
f.write('@SET_TRUE.' + str(set_true_count) + '\n')
if command == 'eq' :
f.write('D;JEQ' + '\n')
if command == 'gt' :
f.write('D;JGT' + '\n')
if command == 'lt' :
f.write('D;JLT' + '\n')
f.write('@SP' + '\n')
f.write('A=M' + '\n')
f.write('M=0' + '\n')
f.write('@CONTINUE.' + str(continue_count) + '\n')
f.write('0;JMP' + '\n')
f.write('(SET_TRUE.' + str(set_true_count) + ')' + '\n')
f.write('@SP' + '\n')
f.write('A=M' + '\n')
f.write('M=1' + '\n')
f.write('(CONTINUE.' + str(continue_count) + ')' + '\n')
set_true_count += 1
continue_count += 1