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|
CALL_ASM = """@{return_address}
D=A
@SP
A=M
M=D
@LCL
D=A
@SP
AM=M+1
M=D
@ARG
D=A
@SP
AM=M+1
M=D
@THIS
D=A
@SP
AM=M+1
M=D
@THAT
D=A
@SP
AM=M+1
M=D
@SP
DM=M+1
@LCL
M=D
@{arg_lcl_offset}
D=D-A
@ARG
M=D
@{function_label}
0;JMP
({return_address})
"""
FUNCTION_ASM = """({function_label})
@SP
A=M
M=0
{init_vars}@SP
M=M+1
"""
# repeated for each local variable of function
INIT_VAR_ASM = """@SP
AM=M+1
M=0
"""
RETURN_ASM = """@ARG
A=M
D=M
@{tmp}
M=D
@SP
A=M-1
D=M
@ARG
A=M
M=D
@ARG
D=M+1
@SP
M=D
@LCL
AM=M-1
D=M
@THAT
M=D
@LCL
AM=M-1
D=M
@THIS
M=D
@LCL
AM=M-1
D=M
@ARG
M=D
@LCL
AM=M-1
D=M
@LCL
M=D
@{tmp}
A=M
0;JMP
"""
ret_idx = {}
def translate_function(action, function, n, prog, verbose=False):
global ret_idx
try:
n = int(n)
except ValueError:
exit_on_error(f"Syntax error: not an integer: {n}", EXIT_CODE_SYNTAX_ERROR)
asm = f"// {action} {function} {n}\n" if verbose else ""
if action == "call":
if prog not in ret_idx:
ret_idx[prog] = 0
else:
ret_idx[prog] += 1
asm += CALL_ASM.format(
return_address=f"{prog}$ret.{ret_idx[prog]}",
arg_lcl_offset=(5 + n),
function_label=f"{function}",
)
else:
asm += FUNCTION_ASM.format(
function_label=f"{function}", init_vars=INIT_VAR_ASM * (n - 1)
)
return asm
def translate_return(verbose=False):
asm = "// return\n" if verbose else ""
asm += RETURN_ASM.format(tmp="R13")
return asm
|
