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Diffstat (limited to 'Asm.py')
| -rw-r--r-- | Asm.py | 67 |
1 files changed, 67 insertions, 0 deletions
@@ -0,0 +1,67 @@ +#!/usr/bin/env python +"""Compiles C into assembly for the practicum processor (PP2) + +All rights reserved, you may not redistribute or use this program without prior +permission from Peter Wu or Xander Houtman. Use of this program is entirely +your own risk. In no circumstances can the authors of this program be held +responsible for any damage including, but not limited to, financial damage or +data loss. Modification of this program is not allowed without prior +permission. The generated output (assembly and messages) are not subject to +this license. +""" + +__author__ = "Peter Wu" +__copyright__ = "Copyright 2011, Peter Wu" +__credits__ = ["Peter Wu"] +__license__ = "Proprietary" +__version__ = "1.0" +__maintainer__ = "Peter Wu" +__email__ = "uwretep@gmail.com" + +import re + +class Asm(object): + def __init__(self): + self.level = 0 + self.re_identifier = re.compile("^[0-9a-zA-Z_][0-9a-zA-Z_]*$") + def is_identifier(self, text): + return self.re_identifier.match(text) + def format_line(self, line, label="", indent_size=-1): + """Returns an indented line optionally prefixed with label""" + if indent_size < 0: + indent_size = 8 + self.level * 4 + if label: + indent_size -= len(label) + 2 + if indent_size >= 0: + label += ": " + else: + label += ":" + # whitespace is generated if indent_size > 0 + indent = indent_size * " " + return indent + label + line + def binary_op(self, binop, reg, operand, label=""): + # output format: BBBB RR OO... + return self.format_line("{:<4} {:<2} {}".format(binop, reg, operand), label) + def unary_op(self, unop, operand, label=""): + # output format: UUUU OO... + return self.format_line("{:<4} {}".format(unop, operand), label) + def branch_op(self, brop, branch_label, label=""): + # output format: BBB LL... + return self.format_line("{:<4} {}".format(brop, branch_label), label) + def push(self, register, label=""): + return self.format_line("PUSH " + register, label) + def pull(self, register, label=""): + return self.format_line("PULL " + register, label) + def insert_label(self, instruction, label): + new_instruction = instruction.lstrip(" ") + indent_size = len(instruction) - len(new_instruction) + return self.format_line(new_instruction, label, indent_size) + def has_label(self, line): + """"Returns True if a line appears to contain a label, False otherwise""" + return self.is_identifier(line.split(":", 1)[0].strip()) + def noop(self, label, register="R0"): + """Returns a labelled no operation operator + + Note that the Zero, Negative and oVerflow flags are modified + """ + return self.binary_op("LOAD", register, register, label) + " ; NOOP" |