LABEL E FUNZIONI ROTTE. RISCRITTO TUTTO
This commit is contained in:
Giulio De Pasquale
parent
536773bc9e
commit
adf7ca002d
@ -49,20 +49,54 @@ class InvalidValue(AssemblerException):
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class VMAssembler:
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def __init__(self, key):
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def __init__(self, key, data):
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self.data = data
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self.assembled_code = bytearray()
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self.encrypt_ops(key)
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self.functions = []
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self.decrypt_ops(key)
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self.parse_functions()
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print(self.functions)
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main = next((x for x in self.functions if x.name == "main"), None)
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if main == None:
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print("Main has to be defined")
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return
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def parse(self, instruction):
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action = getattr(self, "{}".format(instruction.opcode.method))
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action(instruction)
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def parse_functions(self):
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cur_fun_size = 0
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cur_fun_name = None
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fun_start = 0
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def process_code_line(self, line):
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components = [x for x in re.split('\W', line) if x]
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instruction = VMInstruction(components[0], components[1:])
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sys.stdout.write(str(instruction) + "\n")
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self.parse(instruction)
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# first parse to get every function name
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for i, line in enumerate(self.data):
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match = function_re.match(line)
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if match:
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if cur_fun_name:
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f = VMFunction(cur_fun_name, self.data[fun_start:i])
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self.functions.append(f)
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cur_fun_name = match.group(1)
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fun_start = i + 1
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f = VMFunction(cur_fun_name, self.data[fun_start:i + 1])
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self.functions.append(f)
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# putting main in first position in order to assemble it first
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for i, f in enumerate(self.functions):
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if f.name == "main" and i is not 0:
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self.functions[0], self.functions[i] = self.functions[i], self.functions[0]
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break
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# calculating functions offsets
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for i in range(1, len(self.functions)):
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prev_fun_tot_size = self.functions[i-1].size + self.functions[i-1].offset
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cur_fun_size = self.functions[i].size
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self.functions[i].set_offset(prev_fun_tot_size)
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return
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def parse(self):
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for f in self.functions:
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for i in f.instructions:
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action = getattr(self, "{}".format(i.opcode.method))
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action(i)
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def imm2reg(self, instruction):
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"""
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@ -169,11 +203,26 @@ class VMAssembler:
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def jump(self, instruction):
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imm_op_re = re.compile(".*[iI]$")
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reg_op_re = re.compile(".*[rR]$")
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arg = instruction.args[0]
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section = next((x for x in functions if x.name == arg.name), None)
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# TODO this is due the VMComponent structure
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instruction.args[0].name = section.offset
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instruction.args[0].value = section.offset
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symcall = symcall_re.match(str(instruction))
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dst = instruction.args[0]
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# let's check if the jump is to a label or a function
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if symcall:
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# the symbal has not been resolved
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if dst.name == dst.value:
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# check whether it is a function
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val = next((x.offset for x in self.functions if x.name == dst.name), None)
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# check whether it is a label
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if val == None:
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for f in self.functions:
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for i in f.instructions:
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if i.label == dst.name:
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val = f.offset_of_label(dst) + f.offset
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if val == None:
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raise AssemblerException()
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# resolving the symbol
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instruction.args[0].set_value(val)
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# define the kind of jump: to immediate or to register
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if imm_op_re.match(instruction.opcode.name):
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self.immonly(instruction)
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elif reg_op_re.match(instruction.opcode.name):
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@ -189,7 +238,7 @@ class VMAssembler:
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self.assembled_code += opcode.uint8()
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return
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def encrypt_ops(self, key):
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def decrypt_ops(self, key):
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key_ba = bytearray(key, 'utf-8')
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olds = copy.deepcopy(ops)
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@ -206,13 +255,95 @@ class VMAssembler:
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for o, n in zip(olds, ops):
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print("{} : {}->{}".format(o.name, hex(o.value), hex(n.value)))
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class VMFunction:
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def __init__(self, name, code):
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self.name = name
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self.size = 0
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self.offset = 0
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self.instructions = []
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# populating instructions
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i = 0
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while i < len(code):
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line = code[i]
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ins = instruction_re.match(line)
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label = label_re.match(line)
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if label:
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label_name = label.group(1)
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self.instructions.append(VMInstruction(code[i+1], label_name))
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i += 2
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elif ins:
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self.instructions.append(VMInstruction(line))
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i+=1
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self.calc_size()
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def calc_size(self):
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for i in self.instructions:
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self.size += i.size
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def set_offset(self, offset):
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self.offset = offset
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def offset_of_label(self, label):
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offset = 0
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for i in self.instructions:
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offset += i.size
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if i.label == label:
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break
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return offset
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def __repr__(self):
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return "{}: size {}, offset {}".format(self.name, hex(self.size), hex(self.offset))
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class VMInstruction:
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"""
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Represents an instruction the VM recognizes.
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e.g: MOVI [R0, 2]
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^ ^
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opcode args
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"""
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def __init__(self, line, label = None):
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self.opcode = None
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self.args = []
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self.size = 1
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self.label = label
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ins = instruction_re.match(line)
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symcall = symcall_re.match(line)
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opcode = ins.group(1)
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self.opcode = next((x for x in ops if x.name == opcode), None)
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if self.opcode == None:
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raise InvalidOperation(opcode)
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args = [x for x in ins.groups()[1:] if x is not None]
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for a in args:
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if immediate_re.match(a) or symcall:
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# directly append the immediate
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self.args.append(VMComponent(a, a))
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self.size += 2
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continue
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elif register_re.match(a):
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# create a VM component for a register
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reg = next((x for x in regs if x.name == a), None)
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if reg == None:
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raise InvalidRegister(a)
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self.args.append(reg)
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self.size += 1
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continue
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def __repr__(self):
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return "{} {}".format(self.opcode.name, ", ".join([x.name for x in self.args]))
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class VMComponent:
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"""
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Represents a register, operation or an immediate the VM recognizes
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"""
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def __init__(self, name, value, method=None):
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def __init__(self, name, value, method = None):
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self.name = name.casefold()
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self.value = value
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self.method = method
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@ -257,84 +388,15 @@ class VMComponent:
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return True
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def isimm(self):
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if not immediate_re.match(str(self.name)):
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name_alpha = alpha_re.match(str(self.name))
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value_alpha = alpha_re.match(str(self.value))
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name_imm = immediate_re.match(str(self.name))
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value_imm = immediate_re.match(str(self.value))
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if name_alpha and value_alpha and not name_imm and not value_imm:
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return False
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return True
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class VMInstruction:
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"""
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Represents an instruction the VM recognizes.
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e.g: MOVI [R0, 2]
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^ ^
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opcode args
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"""
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def __init__(self, opcode, instr_list):
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self.opcode = None
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self.args = None
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self.size = 1
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self.opcode = next((x for x in ops if x.name == opcode), None)
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if self.opcode == None:
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raise InvalidOperation(opcode)
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self.args = []
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for el in instr_list:
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if immediate_re.match(el):
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# directly append the immediate
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self.args.append(VMComponent(el, el))
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self.size += 2
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continue
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elif register_re.match(el):
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# create a VM component for a register
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reg_comp = next((x for x in regs if x.name == el), None)
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self.args.append(reg_comp)
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self.size += 1
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continue
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else:
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# section
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print(el)
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sec_comp = next((x for x in functions if x.name == el), None)
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if sec_comp:
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self.args.append(VMComponent(
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sec_comp.name, sec_comp.offset))
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self.size += 2
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continue
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raise AssemblerException()
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def __repr__(self):
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return "{} {}".format(self.opcode.name, ", ".join([x.name for x in self.args]))
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class VMFunction:
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"""
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Represents a code section or "label" such as "main:"
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"""
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def __init__(self, name, line_start):
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self.name = name
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self.size = 0
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self.offset = 0
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self.line_start = line_start
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self.line_end = 0
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self.labels = []
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def set_size(self, size):
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self.size = size
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def set_offset(self, offset):
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self.offset = offset
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def set_line_start(self, start):
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self.line_start = start
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def set_line_end(self, end):
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self.line_end = end
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def __repr__(self):
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return "{} | ls: {}, le: {}, s: {}, o: {}".format(self.name, hex(self.line_start), hex(self.line_end), hex(self.size), hex(self.offset))
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op_names = [["MOVI", "imm2reg"],
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["MOVR", "reg2reg"],
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["LOAD", "imm2reg"],
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@ -379,61 +441,13 @@ op_names = [["MOVI", "imm2reg"],
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reg_names = ["R0", "R1", "R2", "R3", "S0", "S1", "S2", "S3", "IP", "BP", "SP"]
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ops = [VMComponent(le[0], i, le[1]) for i, le in enumerate(op_names)]
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regs = [VMComponent(s.casefold(), i) for i, s in enumerate(reg_names)]
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functions = []
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instruction_re = re.compile("([\w]{4})(?:\ +(?:([\w]+)\ *(?:,[\ ]*([\w]+))*))?") # 1: opcode 2+: args
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instruction_re = re.compile("^([\w]{4})(?:\ +(?:([\w]+)\ *(?:,[\ ]*([\w]+))*))?$") # 1: opcode 2+: args
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function_re = re.compile("(?:def\ )([a-zA-Z]*)\:")
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immediate_re = re.compile("(?:0x)?[0-9]*[0-9]$")
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register_re = re.compile("(^[rRsS]{1}[0-4]{1}$)|([iIrRsS]{1}[pP]{1}$)")
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labeldef_re = re.compile("([a-zA-Z]*)\:")
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labelcall_re = re.compile("(?:[jJ]{1}[pPmM]{1}[pPaAbBeEnN]{1}[iIrR]{1}\ *)([\w]*)")
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def parse_functions(lines):
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current_size = 0
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cur_func = None
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# first parsing to get functions' names
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for i, line in enumerate(lines):
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match = function_re.match(line)
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if match:
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if cur_func:
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tmp = next(x for x in functions if x.name == cur_func)
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tmp.set_line_end(i-1)
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cur_func = match.group(2)
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functions.append(VMFunction(cur_func, i + 1))
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continue
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tmp = next(x for x in functions if x.name == cur_func)
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tmp.set_line_end(i)
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# calculating sizes and offsets
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for line in lines:
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match = function_re.match(line)
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if match:
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if cur_func:
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tmp = next(x for x in functions if x.name == cur_func)
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tmp.set_size(current_size)
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cur_func = match.group(2)
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current_size = 0
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continue
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components = [x for x in instruction_re.match(line).groups() if x is not None]
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current_size += VMInstruction(components[0], components[1:]).size
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tmp = next(x for x in functions if x.name == cur_func)
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tmp.set_size(current_size)
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# if not, main as to be the first entry
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for i in range(len(functions)):
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if functions[i].name == "main" and i is not 0:
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functions[0], functions[i] = functions[i], functions[0]
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break
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calc_fun_offsets()
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def calc_fun_offsets():
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current_offset = 0
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for i in range(1, len(functions)):
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prev_size = functions[i - 1].size
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current_offset += prev_size
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functions[i].set_offset(current_offset)
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alpha_re = re.compile("^[a-zA-Z]*$")
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register_re = re.compile("(^[rRsS][0-4]$)|([iIrRsS][pP]$)")
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label_re = re.compile("^([a-zA-Z]+)\:$")
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symcall_re = re.compile("^([jJ][pPmM][pPaAbBeEnN][iIrR])\ +([\w]*)$")
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def main():
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if len(sys.argv) < 4:
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@ -441,22 +455,12 @@ def main():
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sys.argv[0]))
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return
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vma = VMAssembler(sys.argv[1])
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with open(sys.argv[2], 'r') as f:
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filedata = f.readlines()
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filedata = [x.strip() for x in filedata if x.strip()]
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# let's parse the whole file for labels
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parse_functions(filedata)
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if "main" not in [x.name for x in functions]:
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sys.stderr.write("No main specified!")
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return
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for s in functions:
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section_code = filedata[s.line_start:s.line_end+1]
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for line in section_code:
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vma.process_code_line(line)
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vma = VMAssembler(sys.argv[1], filedata)
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vma.parse()
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with open(sys.argv[3], 'wb') as f:
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f.write(vma.assembled_code)
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