cpython/Lib/dis.py

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"""Disassembler of Python byte code into mnemonics."""
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import sys
import types
import collections
import io
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from opcode import *
from opcode import __all__ as _opcodes_all
__all__ = ["code_info", "dis", "disassemble", "distb", "disco",
"findlinestarts", "findlabels", "show_code",
"get_instructions", "Instruction", "Bytecode"] + _opcodes_all
del _opcodes_all
_have_code = (types.MethodType, types.FunctionType, types.CodeType,
classmethod, staticmethod, type)
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FORMAT_VALUE = opmap['FORMAT_VALUE']
FORMAT_VALUE_CONVERTERS = (
(None, ''),
(str, 'str'),
(repr, 'repr'),
(ascii, 'ascii'),
)
MAKE_FUNCTION = opmap['MAKE_FUNCTION']
MAKE_FUNCTION_FLAGS = ('defaults', 'kwdefaults', 'annotations', 'closure')
def _try_compile(source, name):
"""Attempts to compile the given source, first as an expression and
then as a statement if the first approach fails.
Utility function to accept strings in functions that otherwise
expect code objects
"""
try:
c = compile(source, name, 'eval')
except SyntaxError:
c = compile(source, name, 'exec')
return c
def dis(x=None, *, file=None, depth=None):
"""Disassemble classes, methods, functions, and other compiled objects.
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With no argument, disassemble the last traceback.
Compiled objects currently include generator objects, async generator
objects, and coroutine objects, all of which store their code object
in a special attribute.
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"""
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if x is None:
distb(file=file)
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return
# Extract functions from methods.
if hasattr(x, '__func__'):
x = x.__func__
# Extract compiled code objects from...
if hasattr(x, '__code__'): # ...a function, or
x = x.__code__
elif hasattr(x, 'gi_code'): #...a generator object, or
x = x.gi_code
elif hasattr(x, 'ag_code'): #...an asynchronous generator object, or
x = x.ag_code
elif hasattr(x, 'cr_code'): #...a coroutine.
x = x.cr_code
# Perform the disassembly.
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if hasattr(x, '__dict__'): # Class or module
Merged revisions 55631-55794 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/p3yk ................ r55636 | neal.norwitz | 2007-05-29 00:06:39 -0700 (Tue, 29 May 2007) | 149 lines Merged revisions 55506-55635 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r55507 | georg.brandl | 2007-05-22 07:28:17 -0700 (Tue, 22 May 2007) | 2 lines Remove the "panel" module doc file which has been ignored since 1994. ........ r55522 | mark.hammond | 2007-05-22 19:04:28 -0700 (Tue, 22 May 2007) | 4 lines Remove definition of PY_UNICODE_TYPE from pyconfig.h, allowing the definition in unicodeobject.h to be used, giving us the desired wchar_t in place of 'unsigned short'. As discussed on python-dev. ........ r55525 | neal.norwitz | 2007-05-22 23:35:32 -0700 (Tue, 22 May 2007) | 6 lines Add -3 option to the interpreter to warn about features that are deprecated and will be changed/removed in Python 3.0. This patch is mostly from Anthony. I tweaked some format and added a little doc. ........ r55527 | neal.norwitz | 2007-05-22 23:57:35 -0700 (Tue, 22 May 2007) | 1 line Whitespace cleanup ........ r55528 | neal.norwitz | 2007-05-22 23:58:36 -0700 (Tue, 22 May 2007) | 1 line Add a bunch more deprecation warnings for builtins that are going away in 3.0 ........ r55549 | georg.brandl | 2007-05-24 09:49:29 -0700 (Thu, 24 May 2007) | 2 lines shlex.split() now has an optional "posix" parameter. ........ r55550 | georg.brandl | 2007-05-24 10:33:33 -0700 (Thu, 24 May 2007) | 2 lines Fix parameter passing. ........ r55555 | facundo.batista | 2007-05-24 10:50:54 -0700 (Thu, 24 May 2007) | 6 lines Added an optional timeout parameter to urllib.ftpwrapper, with tests (for this and a basic one, because there weren't any). Changed also NEWS, but didn't find documentation for this function, assumed it wasn't public... ........ r55563 | facundo.batista | 2007-05-24 13:01:59 -0700 (Thu, 24 May 2007) | 4 lines Removed the .recv() in the test, is not necessary, and was causing problems that didn't have anything to do with was actually being tested... ........ r55564 | facundo.batista | 2007-05-24 13:51:19 -0700 (Thu, 24 May 2007) | 5 lines Let's see if reading exactly what is written allow this live test to pass (now I know why there were so few tests in ftp, http, etc, :( ). ........ r55567 | facundo.batista | 2007-05-24 20:10:28 -0700 (Thu, 24 May 2007) | 4 lines Trying to make the tests work in Windows and Solaris, everywhere else just works ........ r55568 | facundo.batista | 2007-05-24 20:47:19 -0700 (Thu, 24 May 2007) | 4 lines Fixing stupid error, and introducing a sleep, to see if the other thread is awakened and finish sending data. ........ r55569 | facundo.batista | 2007-05-24 21:20:22 -0700 (Thu, 24 May 2007) | 4 lines Commenting out the tests until find out who can test them in one of the problematic enviroments. ........ r55570 | neal.norwitz | 2007-05-24 22:13:40 -0700 (Thu, 24 May 2007) | 2 lines Get test passing again by commenting out the reference to the test class. ........ r55575 | vinay.sajip | 2007-05-25 00:05:59 -0700 (Fri, 25 May 2007) | 1 line Updated docstring for SysLogHandler (#1720726). ........ r55576 | vinay.sajip | 2007-05-25 00:06:55 -0700 (Fri, 25 May 2007) | 1 line Updated documentation for SysLogHandler (#1720726). ........ r55592 | brett.cannon | 2007-05-25 13:17:15 -0700 (Fri, 25 May 2007) | 3 lines Remove direct call's to file's constructor and replace them with calls to open() as ths is considered best practice. ........ r55601 | kristjan.jonsson | 2007-05-26 12:19:50 -0700 (Sat, 26 May 2007) | 1 line Remove the rgbimgmodule from PCBuild8 ........ r55602 | kristjan.jonsson | 2007-05-26 12:31:39 -0700 (Sat, 26 May 2007) | 1 line Include <windows.h> after python.h, so that WINNT is properly set before windows.h is included. Fixes warnings in PC builds. ........ r55603 | walter.doerwald | 2007-05-26 14:04:13 -0700 (Sat, 26 May 2007) | 2 lines Fix typo. ........ r55604 | peter.astrand | 2007-05-26 15:18:20 -0700 (Sat, 26 May 2007) | 1 line Applied patch 1669481, slightly modified: Support close_fds on Win32 ........ r55606 | neal.norwitz | 2007-05-26 21:08:54 -0700 (Sat, 26 May 2007) | 2 lines Add the new function object attribute names from py3k. ........ r55617 | lars.gustaebel | 2007-05-27 12:49:30 -0700 (Sun, 27 May 2007) | 20 lines Added errors argument to TarFile class that allows the user to specify an error handling scheme for character conversion. Additional scheme "utf-8" in read mode. Unicode input filenames are now supported by design. The values of the pax_headers dictionary are now limited to unicode objects. Fixed: The prefix field is no longer used in PAX_FORMAT (in conformance with POSIX). Fixed: In read mode use a possible pax header size field. Fixed: Strip trailing slashes from pax header name values. Fixed: Give values in user-specified pax_headers precedence when writing. Added unicode tests. Added pax/regtype4 member to testtar.tar all possible number fields in a pax header. Added two chapters to the documentation about the different formats tarfile.py supports and how unicode issues are handled. ........ r55618 | raymond.hettinger | 2007-05-27 22:23:22 -0700 (Sun, 27 May 2007) | 1 line Explain when groupby() issues a new group. ........ r55634 | martin.v.loewis | 2007-05-28 21:01:29 -0700 (Mon, 28 May 2007) | 2 lines Test pre-commit hook for a link to a .py file. ........ r55635 | martin.v.loewis | 2007-05-28 21:02:03 -0700 (Mon, 28 May 2007) | 2 lines Revert 55634. ........ ................ r55639 | neal.norwitz | 2007-05-29 00:58:11 -0700 (Tue, 29 May 2007) | 1 line Remove sys.exc_{type,exc_value,exc_traceback} ................ r55641 | neal.norwitz | 2007-05-29 01:03:50 -0700 (Tue, 29 May 2007) | 1 line Missed one sys.exc_type. I wonder why exc_{value,traceback} were already gone ................ r55642 | neal.norwitz | 2007-05-29 01:08:33 -0700 (Tue, 29 May 2007) | 1 line Missed more doc for sys.exc_* attrs. ................ r55643 | neal.norwitz | 2007-05-29 01:18:19 -0700 (Tue, 29 May 2007) | 1 line Remove sys.exc_clear() ................ r55665 | guido.van.rossum | 2007-05-29 19:45:43 -0700 (Tue, 29 May 2007) | 4 lines Make None, True, False keywords. We can now also delete all the other places that explicitly forbid assignment to None, but I'm not going to bother right now. ................ r55666 | guido.van.rossum | 2007-05-29 20:01:51 -0700 (Tue, 29 May 2007) | 3 lines Found another place that needs check for forbidden names. Fixed test_syntax.py accordingly (it helped me find that one). ................ r55668 | guido.van.rossum | 2007-05-29 20:41:48 -0700 (Tue, 29 May 2007) | 2 lines Mark None, True, False as keywords. ................ r55673 | neal.norwitz | 2007-05-29 23:28:25 -0700 (Tue, 29 May 2007) | 3 lines Get the dis module working on modules again after changing dicts to not return lists and also new-style classes. Add a test. ................ r55674 | neal.norwitz | 2007-05-29 23:35:45 -0700 (Tue, 29 May 2007) | 1 line Umm, it helps to add the module that the test uses ................ r55675 | neal.norwitz | 2007-05-29 23:53:05 -0700 (Tue, 29 May 2007) | 4 lines Try to fix up all the other places that were assigning to True/False. There's at least one more problem in test.test_xmlrpc. I have other changes in that file and that should be fixed soon (I hope). ................ r55679 | neal.norwitz | 2007-05-30 00:31:55 -0700 (Wed, 30 May 2007) | 1 line Fix up another place that was assigning to True/False. ................ r55688 | brett.cannon | 2007-05-30 14:19:47 -0700 (Wed, 30 May 2007) | 2 lines Ditch MimeWriter. ................ r55692 | brett.cannon | 2007-05-30 14:52:00 -0700 (Wed, 30 May 2007) | 2 lines Remove the mimify module. ................ r55707 | guido.van.rossum | 2007-05-31 05:08:45 -0700 (Thu, 31 May 2007) | 2 lines Backport the addition of show_code() to dis.py -- it's too handy. ................ r55708 | guido.van.rossum | 2007-05-31 06:22:57 -0700 (Thu, 31 May 2007) | 7 lines Fix a fairly long-standing bug in the check for assignment to None (and other keywords, these days). In 2.5, you could write foo(None=1) without getting a SyntaxError (although foo()'s definition would have to use **kwds to avoid getting a runtime error complaining about an unknown keyword of course). This ought to be backported to 2.5.2 or at least 2.6. ................ r55724 | brett.cannon | 2007-05-31 19:32:41 -0700 (Thu, 31 May 2007) | 2 lines Remove the cfmfile. ................ r55727 | neal.norwitz | 2007-05-31 22:19:44 -0700 (Thu, 31 May 2007) | 1 line Remove reload() builtin. ................ r55729 | neal.norwitz | 2007-05-31 22:51:30 -0700 (Thu, 31 May 2007) | 59 lines Merged revisions 55636-55728 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r55637 | georg.brandl | 2007-05-29 00:16:47 -0700 (Tue, 29 May 2007) | 2 lines Fix rst markup. ........ r55638 | neal.norwitz | 2007-05-29 00:51:39 -0700 (Tue, 29 May 2007) | 1 line Fix typo in doc ........ r55671 | neal.norwitz | 2007-05-29 21:53:41 -0700 (Tue, 29 May 2007) | 1 line Fix indentation (whitespace only). ........ r55676 | thomas.heller | 2007-05-29 23:58:30 -0700 (Tue, 29 May 2007) | 1 line Fix compiler warnings. ........ r55677 | thomas.heller | 2007-05-30 00:01:25 -0700 (Wed, 30 May 2007) | 2 lines Correct the name of a field in the WIN32_FIND_DATAA and WIN32_FIND_DATAW structures. Closes bug #1726026. ........ r55686 | brett.cannon | 2007-05-30 13:46:26 -0700 (Wed, 30 May 2007) | 2 lines Have MimeWriter raise a DeprecationWarning as per PEP 4 and its documentation. ........ r55690 | brett.cannon | 2007-05-30 14:48:58 -0700 (Wed, 30 May 2007) | 3 lines Have mimify raise a DeprecationWarning. The docs and PEP 4 have listed the module as deprecated for a while. ........ r55696 | brett.cannon | 2007-05-30 15:24:28 -0700 (Wed, 30 May 2007) | 2 lines Have md5 raise a DeprecationWarning as per PEP 4. ........ r55705 | neal.norwitz | 2007-05-30 21:14:22 -0700 (Wed, 30 May 2007) | 1 line Add some spaces in the example code. ........ r55716 | brett.cannon | 2007-05-31 12:20:00 -0700 (Thu, 31 May 2007) | 2 lines Have the sha module raise a DeprecationWarning as specified in PEP 4. ........ r55719 | brett.cannon | 2007-05-31 12:40:42 -0700 (Thu, 31 May 2007) | 2 lines Cause buildtools to raise a DeprecationWarning. ........ r55721 | brett.cannon | 2007-05-31 13:01:11 -0700 (Thu, 31 May 2007) | 2 lines Have cfmfile raise a DeprecationWarning as per PEP 4. ........ r55726 | neal.norwitz | 2007-05-31 21:56:47 -0700 (Thu, 31 May 2007) | 1 line Mail if there is an installation failure. ........ ................ r55730 | neal.norwitz | 2007-05-31 23:22:07 -0700 (Thu, 31 May 2007) | 2 lines Remove the code that was missed in rev 55303. ................ r55738 | neal.norwitz | 2007-06-01 19:10:43 -0700 (Fri, 01 Jun 2007) | 1 line Fix doc breakage ................ r55741 | neal.norwitz | 2007-06-02 00:41:58 -0700 (Sat, 02 Jun 2007) | 1 line Remove timing module (plus some remnants of other modules). ................ r55742 | neal.norwitz | 2007-06-02 00:51:44 -0700 (Sat, 02 Jun 2007) | 1 line Remove posixfile module (plus some remnants of other modules). ................ r55744 | neal.norwitz | 2007-06-02 10:18:56 -0700 (Sat, 02 Jun 2007) | 1 line Fix doc breakage. ................ r55745 | neal.norwitz | 2007-06-02 11:32:16 -0700 (Sat, 02 Jun 2007) | 1 line Make a whatsnew 3.0 template. ................ r55754 | neal.norwitz | 2007-06-03 23:24:18 -0700 (Sun, 03 Jun 2007) | 1 line SF #1730441, os._execvpe raises UnboundLocal due to new try/except semantics ................ r55755 | neal.norwitz | 2007-06-03 23:26:00 -0700 (Sun, 03 Jun 2007) | 1 line Get rid of extra whitespace ................ r55794 | guido.van.rossum | 2007-06-06 15:29:22 -0700 (Wed, 06 Jun 2007) | 3 lines Make this compile in GCC 2.96, which does not allow interspersing declarations and code. ................
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items = sorted(x.__dict__.items())
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for name, x1 in items:
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if isinstance(x1, _have_code):
print("Disassembly of %s:" % name, file=file)
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try:
dis(x1, file=file, depth=depth)
except TypeError as msg:
print("Sorry:", msg, file=file)
print(file=file)
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elif hasattr(x, 'co_code'): # Code object
_disassemble_recursive(x, file=file, depth=depth)
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elif isinstance(x, (bytes, bytearray)): # Raw bytecode
_disassemble_bytes(x, file=file)
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elif isinstance(x, str): # Source code
_disassemble_str(x, file=file, depth=depth)
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else:
Merged revisions 55631-55794 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/p3yk ................ r55636 | neal.norwitz | 2007-05-29 00:06:39 -0700 (Tue, 29 May 2007) | 149 lines Merged revisions 55506-55635 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r55507 | georg.brandl | 2007-05-22 07:28:17 -0700 (Tue, 22 May 2007) | 2 lines Remove the "panel" module doc file which has been ignored since 1994. ........ r55522 | mark.hammond | 2007-05-22 19:04:28 -0700 (Tue, 22 May 2007) | 4 lines Remove definition of PY_UNICODE_TYPE from pyconfig.h, allowing the definition in unicodeobject.h to be used, giving us the desired wchar_t in place of 'unsigned short'. As discussed on python-dev. ........ r55525 | neal.norwitz | 2007-05-22 23:35:32 -0700 (Tue, 22 May 2007) | 6 lines Add -3 option to the interpreter to warn about features that are deprecated and will be changed/removed in Python 3.0. This patch is mostly from Anthony. I tweaked some format and added a little doc. ........ r55527 | neal.norwitz | 2007-05-22 23:57:35 -0700 (Tue, 22 May 2007) | 1 line Whitespace cleanup ........ r55528 | neal.norwitz | 2007-05-22 23:58:36 -0700 (Tue, 22 May 2007) | 1 line Add a bunch more deprecation warnings for builtins that are going away in 3.0 ........ r55549 | georg.brandl | 2007-05-24 09:49:29 -0700 (Thu, 24 May 2007) | 2 lines shlex.split() now has an optional "posix" parameter. ........ r55550 | georg.brandl | 2007-05-24 10:33:33 -0700 (Thu, 24 May 2007) | 2 lines Fix parameter passing. ........ r55555 | facundo.batista | 2007-05-24 10:50:54 -0700 (Thu, 24 May 2007) | 6 lines Added an optional timeout parameter to urllib.ftpwrapper, with tests (for this and a basic one, because there weren't any). Changed also NEWS, but didn't find documentation for this function, assumed it wasn't public... ........ r55563 | facundo.batista | 2007-05-24 13:01:59 -0700 (Thu, 24 May 2007) | 4 lines Removed the .recv() in the test, is not necessary, and was causing problems that didn't have anything to do with was actually being tested... ........ r55564 | facundo.batista | 2007-05-24 13:51:19 -0700 (Thu, 24 May 2007) | 5 lines Let's see if reading exactly what is written allow this live test to pass (now I know why there were so few tests in ftp, http, etc, :( ). ........ r55567 | facundo.batista | 2007-05-24 20:10:28 -0700 (Thu, 24 May 2007) | 4 lines Trying to make the tests work in Windows and Solaris, everywhere else just works ........ r55568 | facundo.batista | 2007-05-24 20:47:19 -0700 (Thu, 24 May 2007) | 4 lines Fixing stupid error, and introducing a sleep, to see if the other thread is awakened and finish sending data. ........ r55569 | facundo.batista | 2007-05-24 21:20:22 -0700 (Thu, 24 May 2007) | 4 lines Commenting out the tests until find out who can test them in one of the problematic enviroments. ........ r55570 | neal.norwitz | 2007-05-24 22:13:40 -0700 (Thu, 24 May 2007) | 2 lines Get test passing again by commenting out the reference to the test class. ........ r55575 | vinay.sajip | 2007-05-25 00:05:59 -0700 (Fri, 25 May 2007) | 1 line Updated docstring for SysLogHandler (#1720726). ........ r55576 | vinay.sajip | 2007-05-25 00:06:55 -0700 (Fri, 25 May 2007) | 1 line Updated documentation for SysLogHandler (#1720726). ........ r55592 | brett.cannon | 2007-05-25 13:17:15 -0700 (Fri, 25 May 2007) | 3 lines Remove direct call's to file's constructor and replace them with calls to open() as ths is considered best practice. ........ r55601 | kristjan.jonsson | 2007-05-26 12:19:50 -0700 (Sat, 26 May 2007) | 1 line Remove the rgbimgmodule from PCBuild8 ........ r55602 | kristjan.jonsson | 2007-05-26 12:31:39 -0700 (Sat, 26 May 2007) | 1 line Include <windows.h> after python.h, so that WINNT is properly set before windows.h is included. Fixes warnings in PC builds. ........ r55603 | walter.doerwald | 2007-05-26 14:04:13 -0700 (Sat, 26 May 2007) | 2 lines Fix typo. ........ r55604 | peter.astrand | 2007-05-26 15:18:20 -0700 (Sat, 26 May 2007) | 1 line Applied patch 1669481, slightly modified: Support close_fds on Win32 ........ r55606 | neal.norwitz | 2007-05-26 21:08:54 -0700 (Sat, 26 May 2007) | 2 lines Add the new function object attribute names from py3k. ........ r55617 | lars.gustaebel | 2007-05-27 12:49:30 -0700 (Sun, 27 May 2007) | 20 lines Added errors argument to TarFile class that allows the user to specify an error handling scheme for character conversion. Additional scheme "utf-8" in read mode. Unicode input filenames are now supported by design. The values of the pax_headers dictionary are now limited to unicode objects. Fixed: The prefix field is no longer used in PAX_FORMAT (in conformance with POSIX). Fixed: In read mode use a possible pax header size field. Fixed: Strip trailing slashes from pax header name values. Fixed: Give values in user-specified pax_headers precedence when writing. Added unicode tests. Added pax/regtype4 member to testtar.tar all possible number fields in a pax header. Added two chapters to the documentation about the different formats tarfile.py supports and how unicode issues are handled. ........ r55618 | raymond.hettinger | 2007-05-27 22:23:22 -0700 (Sun, 27 May 2007) | 1 line Explain when groupby() issues a new group. ........ r55634 | martin.v.loewis | 2007-05-28 21:01:29 -0700 (Mon, 28 May 2007) | 2 lines Test pre-commit hook for a link to a .py file. ........ r55635 | martin.v.loewis | 2007-05-28 21:02:03 -0700 (Mon, 28 May 2007) | 2 lines Revert 55634. ........ ................ r55639 | neal.norwitz | 2007-05-29 00:58:11 -0700 (Tue, 29 May 2007) | 1 line Remove sys.exc_{type,exc_value,exc_traceback} ................ r55641 | neal.norwitz | 2007-05-29 01:03:50 -0700 (Tue, 29 May 2007) | 1 line Missed one sys.exc_type. I wonder why exc_{value,traceback} were already gone ................ r55642 | neal.norwitz | 2007-05-29 01:08:33 -0700 (Tue, 29 May 2007) | 1 line Missed more doc for sys.exc_* attrs. ................ r55643 | neal.norwitz | 2007-05-29 01:18:19 -0700 (Tue, 29 May 2007) | 1 line Remove sys.exc_clear() ................ r55665 | guido.van.rossum | 2007-05-29 19:45:43 -0700 (Tue, 29 May 2007) | 4 lines Make None, True, False keywords. We can now also delete all the other places that explicitly forbid assignment to None, but I'm not going to bother right now. ................ r55666 | guido.van.rossum | 2007-05-29 20:01:51 -0700 (Tue, 29 May 2007) | 3 lines Found another place that needs check for forbidden names. Fixed test_syntax.py accordingly (it helped me find that one). ................ r55668 | guido.van.rossum | 2007-05-29 20:41:48 -0700 (Tue, 29 May 2007) | 2 lines Mark None, True, False as keywords. ................ r55673 | neal.norwitz | 2007-05-29 23:28:25 -0700 (Tue, 29 May 2007) | 3 lines Get the dis module working on modules again after changing dicts to not return lists and also new-style classes. Add a test. ................ r55674 | neal.norwitz | 2007-05-29 23:35:45 -0700 (Tue, 29 May 2007) | 1 line Umm, it helps to add the module that the test uses ................ r55675 | neal.norwitz | 2007-05-29 23:53:05 -0700 (Tue, 29 May 2007) | 4 lines Try to fix up all the other places that were assigning to True/False. There's at least one more problem in test.test_xmlrpc. I have other changes in that file and that should be fixed soon (I hope). ................ r55679 | neal.norwitz | 2007-05-30 00:31:55 -0700 (Wed, 30 May 2007) | 1 line Fix up another place that was assigning to True/False. ................ r55688 | brett.cannon | 2007-05-30 14:19:47 -0700 (Wed, 30 May 2007) | 2 lines Ditch MimeWriter. ................ r55692 | brett.cannon | 2007-05-30 14:52:00 -0700 (Wed, 30 May 2007) | 2 lines Remove the mimify module. ................ r55707 | guido.van.rossum | 2007-05-31 05:08:45 -0700 (Thu, 31 May 2007) | 2 lines Backport the addition of show_code() to dis.py -- it's too handy. ................ r55708 | guido.van.rossum | 2007-05-31 06:22:57 -0700 (Thu, 31 May 2007) | 7 lines Fix a fairly long-standing bug in the check for assignment to None (and other keywords, these days). In 2.5, you could write foo(None=1) without getting a SyntaxError (although foo()'s definition would have to use **kwds to avoid getting a runtime error complaining about an unknown keyword of course). This ought to be backported to 2.5.2 or at least 2.6. ................ r55724 | brett.cannon | 2007-05-31 19:32:41 -0700 (Thu, 31 May 2007) | 2 lines Remove the cfmfile. ................ r55727 | neal.norwitz | 2007-05-31 22:19:44 -0700 (Thu, 31 May 2007) | 1 line Remove reload() builtin. ................ r55729 | neal.norwitz | 2007-05-31 22:51:30 -0700 (Thu, 31 May 2007) | 59 lines Merged revisions 55636-55728 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r55637 | georg.brandl | 2007-05-29 00:16:47 -0700 (Tue, 29 May 2007) | 2 lines Fix rst markup. ........ r55638 | neal.norwitz | 2007-05-29 00:51:39 -0700 (Tue, 29 May 2007) | 1 line Fix typo in doc ........ r55671 | neal.norwitz | 2007-05-29 21:53:41 -0700 (Tue, 29 May 2007) | 1 line Fix indentation (whitespace only). ........ r55676 | thomas.heller | 2007-05-29 23:58:30 -0700 (Tue, 29 May 2007) | 1 line Fix compiler warnings. ........ r55677 | thomas.heller | 2007-05-30 00:01:25 -0700 (Wed, 30 May 2007) | 2 lines Correct the name of a field in the WIN32_FIND_DATAA and WIN32_FIND_DATAW structures. Closes bug #1726026. ........ r55686 | brett.cannon | 2007-05-30 13:46:26 -0700 (Wed, 30 May 2007) | 2 lines Have MimeWriter raise a DeprecationWarning as per PEP 4 and its documentation. ........ r55690 | brett.cannon | 2007-05-30 14:48:58 -0700 (Wed, 30 May 2007) | 3 lines Have mimify raise a DeprecationWarning. The docs and PEP 4 have listed the module as deprecated for a while. ........ r55696 | brett.cannon | 2007-05-30 15:24:28 -0700 (Wed, 30 May 2007) | 2 lines Have md5 raise a DeprecationWarning as per PEP 4. ........ r55705 | neal.norwitz | 2007-05-30 21:14:22 -0700 (Wed, 30 May 2007) | 1 line Add some spaces in the example code. ........ r55716 | brett.cannon | 2007-05-31 12:20:00 -0700 (Thu, 31 May 2007) | 2 lines Have the sha module raise a DeprecationWarning as specified in PEP 4. ........ r55719 | brett.cannon | 2007-05-31 12:40:42 -0700 (Thu, 31 May 2007) | 2 lines Cause buildtools to raise a DeprecationWarning. ........ r55721 | brett.cannon | 2007-05-31 13:01:11 -0700 (Thu, 31 May 2007) | 2 lines Have cfmfile raise a DeprecationWarning as per PEP 4. ........ r55726 | neal.norwitz | 2007-05-31 21:56:47 -0700 (Thu, 31 May 2007) | 1 line Mail if there is an installation failure. ........ ................ r55730 | neal.norwitz | 2007-05-31 23:22:07 -0700 (Thu, 31 May 2007) | 2 lines Remove the code that was missed in rev 55303. ................ r55738 | neal.norwitz | 2007-06-01 19:10:43 -0700 (Fri, 01 Jun 2007) | 1 line Fix doc breakage ................ r55741 | neal.norwitz | 2007-06-02 00:41:58 -0700 (Sat, 02 Jun 2007) | 1 line Remove timing module (plus some remnants of other modules). ................ r55742 | neal.norwitz | 2007-06-02 00:51:44 -0700 (Sat, 02 Jun 2007) | 1 line Remove posixfile module (plus some remnants of other modules). ................ r55744 | neal.norwitz | 2007-06-02 10:18:56 -0700 (Sat, 02 Jun 2007) | 1 line Fix doc breakage. ................ r55745 | neal.norwitz | 2007-06-02 11:32:16 -0700 (Sat, 02 Jun 2007) | 1 line Make a whatsnew 3.0 template. ................ r55754 | neal.norwitz | 2007-06-03 23:24:18 -0700 (Sun, 03 Jun 2007) | 1 line SF #1730441, os._execvpe raises UnboundLocal due to new try/except semantics ................ r55755 | neal.norwitz | 2007-06-03 23:26:00 -0700 (Sun, 03 Jun 2007) | 1 line Get rid of extra whitespace ................ r55794 | guido.van.rossum | 2007-06-06 15:29:22 -0700 (Wed, 06 Jun 2007) | 3 lines Make this compile in GCC 2.96, which does not allow interspersing declarations and code. ................
2007-06-06 20:52:48 -03:00
raise TypeError("don't know how to disassemble %s objects" %
type(x).__name__)
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def distb(tb=None, *, file=None):
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"""Disassemble a traceback (default: last traceback)."""
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if tb is None:
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try:
tb = sys.last_traceback
except AttributeError:
raise RuntimeError("no last traceback to disassemble") from None
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while tb.tb_next: tb = tb.tb_next
disassemble(tb.tb_frame.f_code, tb.tb_lasti, file=file)
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# The inspect module interrogates this dictionary to build its
# list of CO_* constants. It is also used by pretty_flags to
# turn the co_flags field into a human readable list.
COMPILER_FLAG_NAMES = {
1: "OPTIMIZED",
2: "NEWLOCALS",
4: "VARARGS",
8: "VARKEYWORDS",
16: "NESTED",
32: "GENERATOR",
64: "NOFREE",
128: "COROUTINE",
256: "ITERABLE_COROUTINE",
512: "ASYNC_GENERATOR",
}
def pretty_flags(flags):
"""Return pretty representation of code flags."""
names = []
for i in range(32):
flag = 1<<i
if flags & flag:
names.append(COMPILER_FLAG_NAMES.get(flag, hex(flag)))
flags ^= flag
if not flags:
break
else:
names.append(hex(flags))
return ", ".join(names)
def _get_code_object(x):
"""Helper to handle methods, compiled or raw code objects, and strings."""
# Extract functions from methods.
if hasattr(x, '__func__'):
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x = x.__func__
# Extract compiled code objects from...
if hasattr(x, '__code__'): # ...a function, or
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x = x.__code__
elif hasattr(x, 'gi_code'): #...a generator object, or
x = x.gi_code
elif hasattr(x, 'ag_code'): #...an asynchronous generator object, or
x = x.ag_code
elif hasattr(x, 'cr_code'): #...a coroutine.
x = x.cr_code
# Handle source code.
if isinstance(x, str):
x = _try_compile(x, "<disassembly>")
# By now, if we don't have a code object, we can't disassemble x.
if hasattr(x, 'co_code'):
return x
raise TypeError("don't know how to disassemble %s objects" %
type(x).__name__)
def code_info(x):
"""Formatted details of methods, functions, or code."""
return _format_code_info(_get_code_object(x))
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def _format_code_info(co):
lines = []
lines.append("Name: %s" % co.co_name)
lines.append("Filename: %s" % co.co_filename)
lines.append("Argument count: %s" % co.co_argcount)
lines.append("Positional-only arguments: %s" % co.co_posonlyargcount)
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lines.append("Kw-only arguments: %s" % co.co_kwonlyargcount)
lines.append("Number of locals: %s" % co.co_nlocals)
lines.append("Stack size: %s" % co.co_stacksize)
lines.append("Flags: %s" % pretty_flags(co.co_flags))
if co.co_consts:
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lines.append("Constants:")
for i_c in enumerate(co.co_consts):
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lines.append("%4d: %r" % i_c)
if co.co_names:
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lines.append("Names:")
for i_n in enumerate(co.co_names):
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lines.append("%4d: %s" % i_n)
if co.co_varnames:
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lines.append("Variable names:")
for i_n in enumerate(co.co_varnames):
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lines.append("%4d: %s" % i_n)
if co.co_freevars:
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lines.append("Free variables:")
for i_n in enumerate(co.co_freevars):
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lines.append("%4d: %s" % i_n)
if co.co_cellvars:
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lines.append("Cell variables:")
for i_n in enumerate(co.co_cellvars):
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lines.append("%4d: %s" % i_n)
return "\n".join(lines)
def show_code(co, *, file=None):
"""Print details of methods, functions, or code to *file*.
If *file* is not provided, the output is printed on stdout.
"""
print(code_info(co), file=file)
Positions = collections.namedtuple(
'Positions',
[
'lineno',
'end_lineno',
'col_offset',
'end_col_offset',
],
defaults=[None] * 4
)
_Instruction = collections.namedtuple(
"_Instruction",
[
'opname',
'opcode',
'arg',
'argval',
'argrepr',
'offset',
'starts_line',
'is_jump_target',
'positions'
],
defaults=[None]
)
_Instruction.opname.__doc__ = "Human readable name for operation"
_Instruction.opcode.__doc__ = "Numeric code for operation"
_Instruction.arg.__doc__ = "Numeric argument to operation (if any), otherwise None"
_Instruction.argval.__doc__ = "Resolved arg value (if known), otherwise same as arg"
_Instruction.argrepr.__doc__ = "Human readable description of operation argument"
_Instruction.offset.__doc__ = "Start index of operation within bytecode sequence"
_Instruction.starts_line.__doc__ = "Line started by this opcode (if any), otherwise None"
_Instruction.is_jump_target.__doc__ = "True if other code jumps to here, otherwise False"
_Instruction.positions.__doc__ = "dis.Positions object holding the span of source code covered by this instruction"
_ExceptionTableEntry = collections.namedtuple("_ExceptionTableEntry",
"start end target depth lasti")
_OPNAME_WIDTH = 20
_OPARG_WIDTH = 5
class Instruction(_Instruction):
"""Details for a bytecode operation
Defined fields:
opname - human readable name for operation
opcode - numeric code for operation
arg - numeric argument to operation (if any), otherwise None
argval - resolved arg value (if known), otherwise same as arg
argrepr - human readable description of operation argument
offset - start index of operation within bytecode sequence
starts_line - line started by this opcode (if any), otherwise None
is_jump_target - True if other code jumps to here, otherwise False
positions - Optional dis.Positions object holding the span of source code
covered by this instruction
"""
def _disassemble(self, lineno_width=3, mark_as_current=False, offset_width=4):
"""Format instruction details for inclusion in disassembly output
*lineno_width* sets the width of the line number field (0 omits it)
*mark_as_current* inserts a '-->' marker arrow as part of the line
*offset_width* sets the width of the instruction offset field
"""
fields = []
# Column: Source code line number
if lineno_width:
if self.starts_line is not None:
lineno_fmt = "%%%dd" % lineno_width
fields.append(lineno_fmt % self.starts_line)
else:
fields.append(' ' * lineno_width)
# Column: Current instruction indicator
if mark_as_current:
fields.append('-->')
else:
fields.append(' ')
# Column: Jump target marker
if self.is_jump_target:
fields.append('>>')
else:
fields.append(' ')
# Column: Instruction offset from start of code sequence
fields.append(repr(self.offset).rjust(offset_width))
# Column: Opcode name
fields.append(self.opname.ljust(_OPNAME_WIDTH))
# Column: Opcode argument
if self.arg is not None:
fields.append(repr(self.arg).rjust(_OPARG_WIDTH))
# Column: Opcode argument details
if self.argrepr:
fields.append('(' + self.argrepr + ')')
return ' '.join(fields).rstrip()
def get_instructions(x, *, first_line=None):
"""Iterator for the opcodes in methods, functions or code
Generates a series of Instruction named tuples giving the details of
each operations in the supplied code.
If *first_line* is not None, it indicates the line number that should
be reported for the first source line in the disassembled code.
Otherwise, the source line information (if any) is taken directly from
the disassembled code object.
"""
co = _get_code_object(x)
linestarts = dict(findlinestarts(co))
if first_line is not None:
line_offset = first_line - co.co_firstlineno
else:
line_offset = 0
return _get_instructions_bytes(co.co_code,
co._varname_from_oparg,
co.co_names, co.co_consts,
linestarts, line_offset, co_positions=co.co_positions())
def _get_const_info(const_index, const_list):
"""Helper to get optional details about const references
Returns the dereferenced constant and its repr if the constant
list is defined.
Otherwise returns the constant index and its repr().
"""
argval = const_index
if const_list is not None:
argval = const_list[const_index]
return argval, repr(argval)
def _get_name_info(name_index, get_name, **extrainfo):
"""Helper to get optional details about named references
Returns the dereferenced name as both value and repr if the name
list is defined.
Otherwise returns the name index and its repr().
"""
argval = name_index
if get_name is not None:
argval = get_name(name_index, **extrainfo)
argrepr = argval
else:
argrepr = repr(argval)
return argval, argrepr
def parse_varint(iterator):
b = next(iterator)
val = b & 63
while b&64:
val <<= 6
b = next(iterator)
val |= b&63
return val
def parse_exception_table(code):
iterator = iter(code.co_exceptiontable)
entries = []
try:
while True:
start = parse_varint(iterator)*2
length = parse_varint(iterator)*2
end = start + length
target = parse_varint(iterator)*2
dl = parse_varint(iterator)
depth = dl >> 1
lasti = bool(dl&1)
entries.append(_ExceptionTableEntry(start, end, target, depth, lasti))
except StopIteration:
return entries
def _get_instructions_bytes(code, varname_from_oparg=None,
names=None, constants=None,
linestarts=None, line_offset=0,
exception_entries=(), co_positions=None):
"""Iterate over the instructions in a bytecode string.
Generates a sequence of Instruction namedtuples giving the details of each
opcode. Additional information about the code's runtime environment
(e.g. variable names, constants) can be specified using optional
arguments.
"""
co_positions = co_positions or iter(())
get_name = None if names is None else names.__getitem__
labels = set(findlabels(code))
for start, end, target, _, _ in exception_entries:
for i in range(start, end):
labels.add(target)
starts_line = None
for offset, op, arg in _unpack_opargs(code):
if linestarts is not None:
starts_line = linestarts.get(offset, None)
if starts_line is not None:
starts_line += line_offset
is_jump_target = offset in labels
argval = None
argrepr = ''
try:
positions = next(co_positions)
except StopIteration:
positions = None
if arg is not None:
# Set argval to the dereferenced value of the argument when
# available, and argrepr to the string representation of argval.
# _disassemble_bytes needs the string repr of the
# raw name index for LOAD_GLOBAL, LOAD_CONST, etc.
argval = arg
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if op in hasconst:
argval, argrepr = _get_const_info(arg, constants)
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elif op in hasname:
argval, argrepr = _get_name_info(arg, get_name)
elif op in hasjabs:
argval = arg*2
argrepr = "to " + repr(argval)
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elif op in hasjrel:
argval = offset + 2 + arg*2
argrepr = "to " + repr(argval)
elif op in haslocal or op in hasfree:
argval, argrepr = _get_name_info(arg, varname_from_oparg)
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elif op in hascompare:
argval = cmp_op[arg]
argrepr = argval
elif op == FORMAT_VALUE:
argval, argrepr = FORMAT_VALUE_CONVERTERS[arg & 0x3]
argval = (argval, bool(arg & 0x4))
if argval[1]:
if argrepr:
argrepr += ', '
argrepr += 'with format'
elif op == MAKE_FUNCTION:
argrepr = ', '.join(s for i, s in enumerate(MAKE_FUNCTION_FLAGS)
if arg & (1<<i))
yield Instruction(opname[op], op,
arg, argval, argrepr,
offset, starts_line, is_jump_target, positions)
def disassemble(co, lasti=-1, *, file=None):
"""Disassemble a code object."""
linestarts = dict(findlinestarts(co))
exception_entries = parse_exception_table(co)
_disassemble_bytes(co.co_code, lasti,
co._varname_from_oparg,
co.co_names, co.co_consts, linestarts, file=file,
exception_entries=exception_entries, co_positions=co.co_positions())
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def _disassemble_recursive(co, *, file=None, depth=None):
disassemble(co, file=file)
if depth is None or depth > 0:
if depth is not None:
depth = depth - 1
for x in co.co_consts:
if hasattr(x, 'co_code'):
print(file=file)
print("Disassembly of %r:" % (x,), file=file)
_disassemble_recursive(x, file=file, depth=depth)
def _disassemble_bytes(code, lasti=-1, varname_from_oparg=None,
names=None, constants=None, linestarts=None,
*, file=None, line_offset=0, exception_entries=(),
co_positions=None):
# Omit the line number column entirely if we have no line number info
show_lineno = bool(linestarts)
if show_lineno:
maxlineno = max(linestarts.values()) + line_offset
if maxlineno >= 1000:
lineno_width = len(str(maxlineno))
else:
lineno_width = 3
else:
lineno_width = 0
maxoffset = len(code) - 2
if maxoffset >= 10000:
offset_width = len(str(maxoffset))
else:
offset_width = 4
for instr in _get_instructions_bytes(code, varname_from_oparg, names,
constants, linestarts,
line_offset=line_offset, exception_entries=exception_entries,
co_positions=co_positions):
new_source_line = (show_lineno and
instr.starts_line is not None and
instr.offset > 0)
if new_source_line:
print(file=file)
is_current_instr = instr.offset == lasti
print(instr._disassemble(lineno_width, is_current_instr, offset_width),
file=file)
if exception_entries:
print("ExceptionTable:", file=file)
for entry in exception_entries:
lasti = " lasti" if entry.lasti else ""
end = entry.end-2
print(f" {entry.start} to {end} -> {entry.target} [{entry.depth}]{lasti}", file=file)
def _disassemble_str(source, **kwargs):
"""Compile the source string, then disassemble the code object."""
_disassemble_recursive(_try_compile(source, '<dis>'), **kwargs)
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disco = disassemble # XXX For backwards compatibility
def _unpack_opargs(code):
extended_arg = 0
for i in range(0, len(code), 2):
op = code[i]
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if op >= HAVE_ARGUMENT:
arg = code[i+1] | extended_arg
extended_arg = (arg << 8) if op == EXTENDED_ARG else 0
else:
arg = None
yield (i, op, arg)
def findlabels(code):
"""Detect all offsets in a byte code which are jump targets.
Return the list of offsets.
"""
labels = []
for offset, op, arg in _unpack_opargs(code):
if arg is not None:
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if op in hasjrel:
label = offset + 2 + arg*2
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elif op in hasjabs:
label = arg*2
else:
continue
if label not in labels:
labels.append(label)
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return labels
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def findlinestarts(code):
"""Find the offsets in a byte code which are start of lines in the source.
Generate pairs (offset, lineno)
"""
lastline = None
for start, end, line in code.co_lines():
if line is not None and line != lastline:
lastline = line
yield start, line
return
class Bytecode:
"""The bytecode operations of a piece of code
Instantiate this with a function, method, other compiled object, string of
code, or a code object (as returned by compile()).
Iterating over this yields the bytecode operations as Instruction instances.
"""
def __init__(self, x, *, first_line=None, current_offset=None):
self.codeobj = co = _get_code_object(x)
if first_line is None:
self.first_line = co.co_firstlineno
self._line_offset = 0
else:
self.first_line = first_line
self._line_offset = first_line - co.co_firstlineno
self._linestarts = dict(findlinestarts(co))
self._original_object = x
self.current_offset = current_offset
self.exception_entries = parse_exception_table(co)
def __iter__(self):
co = self.codeobj
return _get_instructions_bytes(co.co_code,
co._varname_from_oparg,
co.co_names, co.co_consts,
self._linestarts,
line_offset=self._line_offset,
exception_entries=self.exception_entries)
def __repr__(self):
return "{}({!r})".format(self.__class__.__name__,
self._original_object)
@classmethod
def from_traceback(cls, tb):
""" Construct a Bytecode from the given traceback """
while tb.tb_next:
tb = tb.tb_next
return cls(tb.tb_frame.f_code, current_offset=tb.tb_lasti)
def info(self):
"""Return formatted information about the code object."""
return _format_code_info(self.codeobj)
def dis(self):
"""Return a formatted view of the bytecode operations."""
co = self.codeobj
if self.current_offset is not None:
offset = self.current_offset
else:
offset = -1
with io.StringIO() as output:
_disassemble_bytes(co.co_code,
varname_from_oparg=co._varname_from_oparg,
names=co.co_names, constants=co.co_consts,
linestarts=self._linestarts,
line_offset=self._line_offset,
file=output,
lasti=offset,
exception_entries=self.exception_entries,
co_positions=co.co_positions())
return output.getvalue()
def _test():
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"""Simple test program to disassemble a file."""
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('infile', type=argparse.FileType('rb'), nargs='?', default='-')
args = parser.parse_args()
with args.infile as infile:
source = infile.read()
code = compile(source, args.infile.name, "exec")
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dis(code)
if __name__ == "__main__":
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_test()