def push_static_to_stack(file, index):
file_name = file.replace('.vm', '').split('.vm')[0]
segment_name = file_name.replace('Test', '').split('Test')[0]
return '//push {} {}\n'.format(segment_name, index) + \
'@{}.{}\n'.format(file_name, index) + \
'D=M\n' + \
push_segmentValue_to_stack()
def handling_call(functionName, nArgs):
'''
push returnAddress \\ Ussing the label declarated below
Save frame of the caller \\ LCL, ARG, THIS, THAT
ARG= SP -5 - nArgs \\ Repositions ARG
LCL=SP \\ Repositions LCL
goto function Name \\ Transfers control to the called function
(return Addres) \\ Declares a label for the return - address
'''
call_counter = 0
label_addr = '{}_{}'.format(functionName, str(call_counter))
call_counter += 1
return '// call {} locals: {}\n'.format(functionName, nArgs) + \
'@{}\n'.format(label_addr) + \
'D=A\n' + \
push_segmentValue_to_stack() + \
saved_frame_of_the_caller() + \
'@SP\n' + \
'D=M\n' + \
'@5\n' + \
'D=D-A\n' + \
'@{}\n'.format(nArgs) + \
'D=D-A\n' + \
'@ARG\n' + \
'M=D\n' + \
'@SP\n' + \
'D=M\n' + \
'@LCL\n' + \
'M=D\n' + \
handling_goto(functionName) + \
handling_label(label_addr)
def push_constant_to_stack(constant):
'''
push constant to stack
incrementing the stack by one
'''
return '//push constant {}\n'.format(constant) + \
'@{}\n'.format(constant) + \
'D=A\n' + \
push_segmentValue_to_stack()
def push_segmentAddr_to_stack(segment, index):
'''
temp:
addr = 5 + i, *SP=*addr, SP++
pointer:
*SP=THIS/THAT, SP++
'''
address = baseAddress_segment(segment)
addr = address.get(segment)
register = str(addr + int(index))
return '//push {} {}\n'.format(segment, index) + \
'@R{}\n'.format(register) + \
'D=M\n' + \
push_segmentValue_to_stack()
def push_segment_i(segment, index):
'''
1. compute target addr
addr = segment pointer(base addr) + index
2. push segment value to stack
*SP=*addr
3. incrementing stak by one
SP++
'''
address = baseAddress_segment(segment)
addr = address.get(segment)
return '//push {} {}\n'.format(segment, index) + \
'@{}\n'.format(index) + \
'D=A\n' + \
'@{}\n'.format(addr) + \
'A=M+D\n' + \
'D=M\n' + \
push_segmentValue_to_stack()