When Python is not compiled with PGO, the performance of Python on call_simple
and call_method microbenchmarks depend highly on the code placement. In the
worst case, the performance slowdown can be up to 70%.
The GCC __attribute__((hot)) attribute helps to keep hot code close to reduce
the risk of such major slowdown. This attribute is ignored when Python is
compiled with PGO.
The following functions are considered as hot according to statistics collected
by perf record/perf report:
* _PyEval_EvalFrameDefault()
* call_function()
* _PyFunction_FastCall()
* PyFrame_New()
* frame_dealloc()
* PyErr_Occurred()
Issue #26107: The format of the co_lnotab attribute of code objects changes to
support negative line number delta.
Changes:
* assemble_lnotab(): if line number delta is less than -128 or greater than
127, emit multiple (offset_delta, lineno_delta) in co_lnotab
* update functions decoding co_lnotab to use signed 8-bit integers
- dis.findlinestarts()
- PyCode_Addr2Line()
- _PyCode_CheckLineNumber()
- frame_setlineno()
* update lnotab_notes.txt
* increase importlib MAGIC_NUMBER to 3361
* document the change in What's New in Python 3.6
* cleanup also PyCode_Optimize() to use better variable names
crash when a generator is created in a C thread that is destroyed while the
generator is still used. The issue was that a generator contains a frame, and
the frame kept a reference to the Python state of the destroyed C thread. The
crash occurs when a trace function is setup.
It is now possible to use a custom type for the __builtins__ namespace, instead
of a dict. It can be used for sandboxing for example. Raise also a NameError
instead of ImportError if __build_class__ name if not found in __builtins__.
This allows generators that are using yield from to be seen by debuggers. It
also kills the f_yieldfrom field on frame objects.
Patch mostly from Mark Shannon with a few tweaks by me.
svn+ssh://pythondev@svn.python.org/python/trunk
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r72487 | jeffrey.yasskin | 2009-05-08 17:51:06 -0400 (Fri, 08 May 2009) | 7 lines
PyCode_NewEmpty:
Most uses of PyCode_New found by http://www.google.com/codesearch?q=PyCode_New
are trying to build an empty code object, usually to put it in a dummy frame
object. This patch adds a PyCode_NewEmpty wrapper which lets the user specify
just the filename, function name, and first line number, instead of also
requiring lots of code internals.
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r72488 | jeffrey.yasskin | 2009-05-08 18:23:21 -0400 (Fri, 08 May 2009) | 13 lines
Issue 5954, PyFrame_GetLineNumber:
Most uses of PyCode_Addr2Line
(http://www.google.com/codesearch?q=PyCode_Addr2Line) are just trying to get
the line number of a specified frame, but there's no way to do that directly.
Forcing people to go through the code object makes them know more about the
guts of the interpreter than they should need.
The remaining uses of PyCode_Addr2Line seem to be getting the line from a
traceback (for example,
http://www.google.com/codesearch/p?hl=en#u_9_nDrchrw/pygame-1.7.1release/src/base.c&q=PyCode_Addr2Line),
which is replaced by the tb_lineno field. So we may be able to deprecate
PyCode_Addr2Line entirely for external use.
........
r72879 | jeffrey.yasskin | 2009-05-23 19:23:01 -0400 (Sat, 23 May 2009) | 14 lines
Issue #6042:
lnotab-based tracing is very complicated and isn't documented very well. There
were at least 3 comment blocks purporting to document co_lnotab, and none did a
very good job. This patch unifies them into Objects/lnotab_notes.txt which
tries to completely capture the current state of affairs.
I also discovered that we've attached 2 layers of patches to the basic tracing
scheme. The first layer avoids jumping to instructions that don't start a line,
to avoid problems in if statements and while loops. The second layer
discovered that jumps backward do need to trace at instructions that don't
start a line, so it added extra lnotab entries for 'while' and 'for' loops, and
added a special case for backward jumps within the same line. I replaced these
patches by just treating forward and backward jumps differently.
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svn+ssh://pythondev@svn.python.org/python/trunk
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r73114 | amaury.forgeotdarc | 2009-06-01 22:53:18 +0200 (lun., 01 juin 2009) | 3 lines
#4547: When debugging a very large function, it was not always
possible to update the lineno attribute of the current frame.
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svn+ssh://pythondev@svn.python.org/python/trunk
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r72776 | jeffrey.yasskin | 2009-05-18 14:14:54 -0700 (Mon, 18 May 2009) | 6 lines
While I was modifying test_trace, it threw an exception when I accidentally
made it try to set the line number from the trace callback for a 'call' event.
This patch makes the error message a little more helpful in that case, and
makes it a little less likely that a future editor will make the same mistake
in test_trace.
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r72796 | jeffrey.yasskin | 2009-05-20 10:57:57 -0700 (Wed, 20 May 2009) | 3 lines
Fix issue #1689458 by teaching frame_setlineno how to jump to the first line of
a code object.
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svn+ssh://pythondev@svn.python.org/python/trunk
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r71722 | benjamin.peterson | 2009-04-18 15:12:47 -0500 (Sat, 18 Apr 2009) | 1 line
try to initalize all builtin types with PyType_Ready to avoid problems like #5787
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svn+ssh://pythondev@svn.python.org/python/trunk
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r60790 | raymond.hettinger | 2008-02-14 10:32:45 +0100 (Thu, 14 Feb 2008) | 4 lines
Add diagnostic message to help figure-out why SocketServer tests occasionally crash
when trying to remove a pid that in not in the activechildren list.
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r60791 | raymond.hettinger | 2008-02-14 11:46:57 +0100 (Thu, 14 Feb 2008) | 1 line
Add fixed-point examples to the decimal FAQ
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r60792 | raymond.hettinger | 2008-02-14 12:01:10 +0100 (Thu, 14 Feb 2008) | 1 line
Improve rst markup
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r60794 | raymond.hettinger | 2008-02-14 12:57:25 +0100 (Thu, 14 Feb 2008) | 1 line
Show how to remove exponents.
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r60795 | raymond.hettinger | 2008-02-14 13:05:42 +0100 (Thu, 14 Feb 2008) | 1 line
Fix markup.
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r60797 | christian.heimes | 2008-02-14 13:47:33 +0100 (Thu, 14 Feb 2008) | 1 line
Implemented Martin's suggestion to clear the free lists during the garbage collection of the highest generation.
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r60798 | raymond.hettinger | 2008-02-14 13:49:37 +0100 (Thu, 14 Feb 2008) | 1 line
Simplify moneyfmt() recipe.
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r60810 | raymond.hettinger | 2008-02-14 20:02:39 +0100 (Thu, 14 Feb 2008) | 1 line
Fix markup
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r60811 | raymond.hettinger | 2008-02-14 20:30:30 +0100 (Thu, 14 Feb 2008) | 1 line
No need to register subclass of ABCs.
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r60814 | thomas.heller | 2008-02-14 22:00:28 +0100 (Thu, 14 Feb 2008) | 1 line
Try to correct a markup error that does hide the following paragraph.
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r60822 | christian.heimes | 2008-02-14 23:40:11 +0100 (Thu, 14 Feb 2008) | 1 line
Use a static and interned string for __subclasscheck__ and __instancecheck__ as suggested by Thomas Heller in #2115
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r60827 | christian.heimes | 2008-02-15 07:57:08 +0100 (Fri, 15 Feb 2008) | 1 line
Fixed repr() and str() of complex numbers. Complex suffered from the same problem as floats but I forgot to test and fix them.
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r60830 | christian.heimes | 2008-02-15 09:20:11 +0100 (Fri, 15 Feb 2008) | 2 lines
Bug #2111: mmap segfaults when trying to write a block opened with PROT_READ
Thanks to Thomas Herve for the fix.
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r60835 | eric.smith | 2008-02-15 13:14:32 +0100 (Fri, 15 Feb 2008) | 1 line
In PyNumber_ToBase, changed from an assert to returning an error when PyObject_Index() returns something other than an int or long. It should never be possible to trigger this, as PyObject_Index checks to make sure it returns an int or long.
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r60837 | skip.montanaro | 2008-02-15 20:03:59 +0100 (Fri, 15 Feb 2008) | 8 lines
Two new functions:
* place_summary_first copies the regrtest summary to the front of the file
making it easier to scan quickly for problems.
* count_failures gets the actual count of the number of failing tests, not
just a 1 (some failures) or 0 (no failures).
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r60840 | raymond.hettinger | 2008-02-15 22:21:25 +0100 (Fri, 15 Feb 2008) | 1 line
Update example to match the current syntax.
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r60841 | amaury.forgeotdarc | 2008-02-15 22:22:45 +0100 (Fri, 15 Feb 2008) | 8 lines
Issue #2115: __slot__ attributes setting was 10x slower.
Also correct a possible crash using ABCs.
This change is exactly the same as an optimisation
done 5 years ago, but on slot *access*:
http://svn.python.org/view?view=rev&rev=28297
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r60842 | amaury.forgeotdarc | 2008-02-15 22:27:44 +0100 (Fri, 15 Feb 2008) | 2 lines
Temporarily let these tests pass
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r60843 | kurt.kaiser | 2008-02-15 22:56:36 +0100 (Fri, 15 Feb 2008) | 2 lines
ScriptBinding event handlers weren't returning 'break'. Patch 2050, Tal Einat.
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r60844 | kurt.kaiser | 2008-02-15 23:25:09 +0100 (Fri, 15 Feb 2008) | 4 lines
Configured selection highlighting colors were ignored; updating highlighting
in the config dialog would cause non-Python files to be colored as if they
were Python source; improve use of ColorDelagator. Patch 1334. Tal Einat.
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r60845 | amaury.forgeotdarc | 2008-02-15 23:44:20 +0100 (Fri, 15 Feb 2008) | 9 lines
Re-enable tests, they were failing since gc.collect() clears the various freelists.
They still remain fragile.
For example, a call to assertEqual currently does not make any allocation
(which surprised me at first).
But this can change when gc.collect also deletes the numerous "zombie frames"
attached to each function.
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svn+ssh://pythondev@svn.python.org/python/trunk
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r60568 | christian.heimes | 2008-02-04 19:48:38 +0100 (Mon, 04 Feb 2008) | 1 line
Increase debugging to investige failing tests on some build bots
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r60570 | christian.heimes | 2008-02-04 20:30:05 +0100 (Mon, 04 Feb 2008) | 1 line
Small adjustments for test compact freelist test. It's no passing on Windows as well.
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r60573 | amaury.forgeotdarc | 2008-02-04 21:53:14 +0100 (Mon, 04 Feb 2008) | 2 lines
Correct quotes in NEWS file
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r60575 | amaury.forgeotdarc | 2008-02-04 22:45:05 +0100 (Mon, 04 Feb 2008) | 13 lines
#1750076: Debugger did not step on every iteration of a while statement.
The mapping between bytecode offsets and source lines (lnotab) did not contain
an entry for the beginning of the loop.
Now it does, and the lnotab can be a bit larger:
in particular, several statements on the same line generate several entries.
However, this does not bother the settrace function, which will trigger only
one 'line' event.
The lnotab seems to be exactly the same as with python2.4.
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r60584 | amaury.forgeotdarc | 2008-02-05 01:26:21 +0100 (Tue, 05 Feb 2008) | 3 lines
Change r60575 broke test_compile:
there is no need to emit co_lnotab item when both offsets are zeros.
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r60587 | skip.montanaro | 2008-02-05 03:32:16 +0100 (Tue, 05 Feb 2008) | 1 line
sync with most recent version from python-mode sf project
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r60588 | lars.gustaebel | 2008-02-05 12:51:40 +0100 (Tue, 05 Feb 2008) | 5 lines
Issue #2004: Use mode 0700 for temporary directories and default
permissions for missing directories.
(will backport to 2.5)
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r60590 | georg.brandl | 2008-02-05 13:01:24 +0100 (Tue, 05 Feb 2008) | 2 lines
Convert external links to internal links. Fixes#2010.
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r60592 | marc-andre.lemburg | 2008-02-05 15:50:40 +0100 (Tue, 05 Feb 2008) | 3 lines
Keep distutils Python 2.1 compatible (or even Python 2.4 in this case).
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r60593 | andrew.kuchling | 2008-02-05 17:06:57 +0100 (Tue, 05 Feb 2008) | 5 lines
Update PEP URL.
(This code is duplicated between pydoc and DocXMLRPCServer; maybe it
should be refactored as a GHOP project.)
2.5.2 backport candidate.
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r60596 | guido.van.rossum | 2008-02-05 18:32:15 +0100 (Tue, 05 Feb 2008) | 2 lines
In the experimental 'Scanner' feature, the group count was set wrong.
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r60602 | facundo.batista | 2008-02-05 20:03:32 +0100 (Tue, 05 Feb 2008) | 3 lines
Issue 1951. Converts wave test cases to unittest.
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r60603 | georg.brandl | 2008-02-05 20:07:10 +0100 (Tue, 05 Feb 2008) | 2 lines
Actually run the test.
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r60604 | skip.montanaro | 2008-02-05 20:24:30 +0100 (Tue, 05 Feb 2008) | 2 lines
correct object name
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r60605 | georg.brandl | 2008-02-05 20:58:17 +0100 (Tue, 05 Feb 2008) | 7 lines
* Use the same code to profile for test_profile and test_cprofile.
* Convert both to unittest.
* Use the same unit testing code.
* Include the expected output in both test files.
* Make it possible to regenerate the expected output by running
the file as a script with an '-r' argument.
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r60613 | raymond.hettinger | 2008-02-06 02:49:00 +0100 (Wed, 06 Feb 2008) | 1 line
Sync-up with Py3k work.
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r60614 | christian.heimes | 2008-02-06 13:44:34 +0100 (Wed, 06 Feb 2008) | 1 line
Limit free list of method and builtin function objects to 256 entries each.
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r60616 | christian.heimes | 2008-02-06 14:33:44 +0100 (Wed, 06 Feb 2008) | 7 lines
Unified naming convention for free lists and their limits. All free lists
in Object/ are named ``free_list``, the counter ``numfree`` and the upper
limit is a macro ``PyName_MAXFREELIST`` inside an #ifndef block.
The chances should make it easier to adjust Python for platforms with
less memory, e.g. mobile phones.
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svn+ssh://pythondev@svn.python.org/python/branches/p3yk
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r56497 | kurt.kaiser | 2007-07-22 14:55:16 -0700 (Sun, 22 Jul 2007) | 4 lines
In the case of syntax errors, in py3k format_exception_only()
was including line number and position in the final line of the
exception notification, duplicating info in previous lines.
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r56501 | kurt.kaiser | 2007-07-22 19:35:50 -0700 (Sun, 22 Jul 2007) | 2 lines
Hum, needed a newline in the last change.
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r56536 | kurt.kaiser | 2007-07-24 19:06:48 -0700 (Tue, 24 Jul 2007) | 5 lines
Not all instantiations of SyntaxError set the args attribute.
e.g. symtable.c
Modify format_exception_only() to get SyntaxError attributes directly
instead of unpacking 'args'.
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r56537 | kurt.kaiser | 2007-07-24 19:13:03 -0700 (Tue, 24 Jul 2007) | 3 lines
Update doctest strings: traceback.py no longer prints redundant location
information in the last line of the exception display.
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r56627 | kurt.kaiser | 2007-07-29 21:06:57 -0700 (Sun, 29 Jul 2007) | 2 lines
Interactive interpreter emulator (code.py) failing to print exceptions.
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r56628 | kurt.kaiser | 2007-07-29 21:41:02 -0700 (Sun, 29 Jul 2007) | 2 lines
Eliminate extra lines before and after tracebacks.
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r56638 | kurt.kaiser | 2007-07-31 19:36:45 -0700 (Tue, 31 Jul 2007) | 3 lines
Refactor syntax error display in shell and edit windows; move
colorize_syntax_error() to EditorWindow; update to py3k.
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r56685 | neal.norwitz | 2007-08-02 22:20:23 -0700 (Thu, 02 Aug 2007) | 10 lines
Remove several h/w and o/s specific modules that are undocumented, obsolete,
and/or not widely used:
linuxaudiodev.c, sunaudiodev.c Lib/plat-sunos5/SUNAUDIODEV.py
Lib/audiodev.py Tools/audiopy/audiopy
Move Lib/toaiff.py to Demo.
See PEP 3108 for most of the details.
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r56686 | neal.norwitz | 2007-08-02 22:21:48 -0700 (Thu, 02 Aug 2007) | 4 lines
Missed one module that should have been removed since it relied
on audiodev which was removed.
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r56748 | neal.norwitz | 2007-08-04 19:19:04 -0700 (Sat, 04 Aug 2007) | 1 line
Make from X import * outside module scope an error.
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r56750 | neal.norwitz | 2007-08-04 19:35:01 -0700 (Sat, 04 Aug 2007) | 1 line
Use READONLY consistently instead of RO
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INADA Naoki
Victor Stinner
Serhiy Storchaka
Yury Selivanov
Antoine Pitrou
David Malcolm
Kristjan Valur Jonsson
Benjamin Peterson
Nick Coghlan
Mark Dickinson
Alexandre Vassalotti
Amaury Forgeot d'Arc
Jeffrey Yasskin
Christian Heimes
Georg Brandl
Robert Schuppenies
Martin v. Löwis
Neal Norwitz
Guido van Rossum