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Flynnon
2019-03-10 15:40:46 +08:00
committed by GitHub
parent dc582e28cb
commit fa4bcc6ccc
1 changed files with 30 additions and 7 deletions
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37
source/c09/p25_disassembling_python_byte_code.rst
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@@ -15,14 +15,38 @@
.. code-block:: python .. code-block:: python
>>> def countdown(n): >>> def countdown(n):
... while n > 0: ... while n > 0:
... print('T-minus', n) ... print('T-minus', n)
... n -= 1 ... n -= 1
... print('Blastoff!') ... print('Blastoff!')
... ...
>>> import dis >>> import dis
>>> dis.dis(countdown) >>> dis.dis(countdown)
... 2 0 SETUP_LOOP 30 (to 32)
>> 2 LOAD_FAST 0 (n)
4 LOAD_CONST 1 (0)
6 COMPARE_OP 4 (>)
8 POP_JUMP_IF_FALSE 30
3 10 LOAD_GLOBAL 0 (print)
12 LOAD_CONST 2 ('T-minus')
14 LOAD_FAST 0 (n)
16 CALL_FUNCTION 2
18 POP_TOP
4 20 LOAD_FAST 0 (n)
22 LOAD_CONST 3 (1)
24 INPLACE_SUBTRACT
26 STORE_FAST 0 (n)
28 JUMP_ABSOLUTE 2
>> 30 POP_BLOCK
5 >> 32 LOAD_GLOBAL 0 (print)
34 LOAD_CONST 4 ('Blastoff!')
36 CALL_FUNCTION 1
38 POP_TOP
40 LOAD_CONST 0 (None)
42 RETURN_VALUE
>>> >>>
---------- ----------
@@ -46,9 +70,8 @@
>>> c = countdown.__code__.co_code >>> c = countdown.__code__.co_code
>>> import opcode >>> import opcode
>>> opcode.opname[c[0]] >>> opcode.opname[c[0]]
>>> opcode.opname[c[0]]
'SETUP_LOOP' 'SETUP_LOOP'
>>> opcode.opname[c[3]] >>> opcode.opname[c[2]]
'LOAD_FAST' 'LOAD_FAST'
>>> >>>