1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
#!/usr/bin/python3
from enum import Enum
class MalformedArgument(Exception):
pass
class ArgType(Enum):
IMM = 1
REG = 2
VAL = 3
LAB = 4
def gettype(s):
if s.isnumeric():
return (ArgType.IMM, int(s))
elif s[0] == 'r' and s[1:].isnumeric():
return (ArgType.REG, int(s[1:]))
elif s[0] == 'l' and s[1:].isnumeric():
return (ArgType.LAB, int(s[1:]))
else:
raise MalformedArgument(s)
def typecheck(self, s):
t = ArgType.gettype(s)
if self == ArgType.VAL:
return t[0] == ArgType.REG or t[0] == ArgType.IMM
else:
return t[0] == self
class OpcodeException(Exception):
pass
class TypecheckLenException(Exception):
pass
class TypecheckException(Exception):
pass
class Instruction:
def __init__(self, opcode, argtypes):
if opcode > 0x7F or opcode < 0:
raise OpcodeException(opcode)
self.opcode = opcode
self.argtypes = argtypes
def typecheck(self, sargs):
rargs = []
if len(sargs) != len(self.argtypes):
raise TypecheckLenException(sargs, self.argtypes)
for i in range(0, len(sargs)):
if not self.argtypes[i].typecheck(sargs[i]):
raise TypecheckException(self.argtypes[i],
sargs[i])
rargs.append(ArgType.gettype(sargs[i]))
return rargs
instructions = {
"nop" : Instruction(0, []),
"push" : Instruction(1, [ArgType.REG]),
"pop" : Instruction(2, [ArgType.REG]),
"add" : Instruction(3, [ArgType.VAL, ArgType.VAL, ArgType.VAL]),
"mul" : Instruction(4, [ArgType.VAL, ArgType.VAL, ArgType.VAL]),
"div" : Instruction(5, [ArgType.VAL, ArgType.VAL, ArgType.VAL]),
"jl" : Instruction(6, [ArgType.LAB, ArgType.VAL, ArgType.VAL]),
"clb" : Instruction(7, [ArgType.LAB]),
"sys" : Instruction(8, [ArgType.VAL])
}
encoding_types = {
# start mask A B
2: (0x7F, 0xC0, 7),
3: (0xFFF, 0xE0, 12),
4: (0x1FFFF, 0xF0, 16),
5: (0x3FFFFF, 0xF8, 21),
6: (0x7FFFFFF, 0xFC, 26),
7: (0xFFFFFFFF, 0xFE, 36),
# A : number of bits in start byte
# B : Total number of bits excluding high bits
}
class InvalidNumberException(Exception):
pass
class InvalidLengthException(Exception):
pass
def encode_pseudo_utf8(n, high_bits, to):
if n < 0:
raise InvalidNumberException(n)
if to is None or to < 0:
for k in sorted(encoding_types):
if n <= encoding_types[k][0]:
to = k
break
if to is None:
raise InvalidNumberException(n)
if to > 8 or to < 0:
raise InvalidLengthException(to)
elif to == 1:
if n < 0x80:
return bytes([n])
else:
raise InvalidNumberException(n,to)
(maxval, start_byte, n_tot) = encoding_types[to]
if n > maxval or high_bits > 15:
raise InvalidNumberException(n, high_bits)
n = n | (high_bits << n_tot)
all_bytes = []
for i in range(0, to - 1):
all_bytes.append(0x80 | (n & 0x3F))
n >>= 6
all_bytes.append(start_byte | n)
return bytes(reversed(all_bytes))
class RangeCheckException(Exception):
pass
class Line:
def __init__(self, opcode, args, labnum, regnum):
self.opcode = opcode
self.args = args
for a in args:
if a[0] == ArgType.REG:
if a[1] < 0 or a[1] >= regnum:
raise RangeCheckException(a[0],
a[1],
regnum)
elif a[0] == ArgType.LAB:
if a[1] < 0 or a[1] >= labnum:
raise RangeCheckException(a[0],
a[1],
regnum)
def __call__(self):
b = bytes([self.opcode])
for a in self.args:
l = 2 if a[1] < 0x80 else None
if a[0] == ArgType.REG:
b = b + encode_pseudo_utf8(a[1],1,l)
else:
b = b + encode_pseudo_utf8(a[1],0,l)
return b + bytes([0])
class InstructionNotFoundException(Exception):
pass
class Program:
def asm_push_line(self, ins, args):
self.asm.append(Line(ins, args, self.labnum, self.regnum))
def parse_asm_line(self, line):
line = line.split()
line[0] = line[0].casefold()
if line[0] not in instructions:
raise InstructionNotFoundException(line[0])
else:
ins = instructions[line[0]]
args_w_type = ins.typecheck(line[1:])
self.asm_push_line(ins.opcode, args_w_type)
def __call__(self):
b = bytes()
for line in self.asm:
b = b + line()
return b
def __init__(self, labnum=16, regnum=16):
self.asm = []
self.labnum = labnum
self.regnum = regnum
|
