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Python disassemblerPython disassembler converts byte codes to a human-readable representation for analysis.
>>> import dis
# Small example
>>> def tmpFunc():
... x = 2
... y = 3
... return x+y
...
# The disassembler produces the output in the following format:
# source line no, the instruction 'address' within the code object, opcode name, arguments passed to the opcode.
>>> dis.dis(tmpFunc)
2 0 LOAD_CONST 1 (2)
3 STORE_FAST 0 (x)
3 6 LOAD_CONST 2 (3)
9 STORE_FAST 1 (y)
4 12 LOAD_FAST 0 (x)
15 LOAD_FAST 1 (y)
18 BINARY_ADD
19 RETURN_VALUE
# Slightly bigger example
>>> def dummyFunc():
... print (2*2)
... a = 1
... b = 2
... if (a < b):
... print (a, ">", b)
... else:
... print (b, ">", a)
...
# source line no, the instruction 'address' within the code object, opcode name, arguments passed to the opcode.
>>> dis.dis (dummyFunc)
2 0 LOAD_GLOBAL 0 (print)
3 LOAD_CONST 4 (4)
6 CALL_FUNCTION 1 (1 positional, 0 keyword pair)
9 POP_TOP
3 10 LOAD_CONST 2 (1)
13 STORE_FAST 0 (a)
4 16 LOAD_CONST 1 (2)
19 STORE_FAST 1 (b)
5 22 LOAD_FAST 0 (a)
25 LOAD_FAST 1 (b)
28 COMPARE_OP 0 (<)
31 POP_JUMP_IF_FALSE 53
6 34 LOAD_GLOBAL 0 (print)
37 LOAD_FAST 0 (a)
40 LOAD_CONST 3 ('>')
43 LOAD_FAST 1 (b)
46 CALL_FUNCTION 3 (3 positional, 0 keyword pair)
49 POP_TOP
50 JUMP_FORWARD 16 (to 69)
8 >> 53 LOAD_GLOBAL 0 (print)
56 LOAD_FAST 1 (b)
59 LOAD_CONST 3 ('>')
62 LOAD_FAST 0 (a)
65 CALL_FUNCTION 3 (3 positional, 0 keyword pair)
68 POP_TOP
>> 69 LOAD_CONST 0 (None)
72 RETURN_VALUE
>>>
# One can also use show_code to get more code metrics
>>> dis.show_code(tmpFunc)
Name: tmpFunc
Filename: <stdin>
Argument count: 0
Kw-only arguments: 0
Number of locals: 2
Stack size: 2
Flags: OPTIMIZED, NEWLOCALS, NOFREE
Constants:
0: None
1: 2
2: 3
Variable names:
0: x
1: y
Serious disassemblers must try help(dis) Disassembler opcodes
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