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Eric Snow 2c1e2583fd
bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 
A number of places in the code base (notably ceval.c and frameobject.c) rely on mapping variable names to indices in the frame "locals plus" array (AKA fast locals), and thus opargs.  Currently the compiler indirectly encodes that information on the code object as the tuples co_varnames, co_cellvars, and co_freevars.  At runtime the dependent code must calculate the proper mapping from those, which isn't ideal and impacts performance-sensitive sections.  This is something we can easily address in the compiler instead.

This change addresses the situation by replacing internal use of co_varnames, etc. with a single combined tuple of names in locals-plus order, along with a minimal array mapping each to its kind (local vs. cell vs. free).  These two new PyCodeObject fields, co_fastlocalnames and co_fastllocalkinds, are not exposed to Python code for now, but co_varnames, etc. are still available with the same values as before (though computed lazily).

Aside from the (mild) performance impact, there are a number of other benefits:

* there's now a clear, direct relationship between locals-plus and variables
* code that relies on the locals-plus-to-name mapping is simpler
* marshaled code objects are smaller and serialize/de-serialize faster

Also note that we can take this approach further by expanding the possible values in co_fastlocalkinds to include specific argument types (e.g. positional-only, kwargs).  Doing so would allow further speed-ups in _PyEval_MakeFrameVector(), which is where args get unpacked into the locals-plus array.  It would also allow us to shrink marshaled code objects even further.

https://bugs.python.org/issue43693
2021-06-03 10:28:27 -06:00
..
clinic bpo-31861: Add aiter and anext to builtins (#23847) 2021-03-23 15:47:21 -07:00
_warnings.c bpo-44032: Move data stack to thread from FrameObject. (GH-26076) 2021-05-21 10:57:35 +01:00
asdl.c bpo-43244: Remove ast.h, asdl.h, Python-ast.h headers (GH-24933) 2021-03-23 20:47:40 +01:00
ast.c bpo-43892: Make match patterns explicit in the AST (GH-25585) 2021-04-28 22:58:44 -07:00
ast_opt.c bpo-28307: Tests and fixes for optimization of C-style formatting (GH-26318) 2021-05-23 19:06:48 +03:00
ast_unparse.c bpo-43892: Make match patterns explicit in the AST (GH-25585) 2021-04-28 22:58:44 -07:00
bltinmodule.c bpo-43892: Make match patterns explicit in the AST (GH-25585) 2021-04-28 22:58:44 -07:00
bootstrap_hash.c bpo-41100: Support macOS 11 and Apple Silicon (GH-22855) 2020-11-08 10:05:27 +01:00
ceval.c bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
ceval_gil.h bpo-43268: Pass interp rather than tstate to internal functions (GH-24580) 2021-02-19 15:10:45 +01:00
codecs.c bpo-42157: unicodedata avoids references to UCD_Type (GH-22990) 2020-10-26 19:19:36 +01:00
compile.c bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
condvar.h Typo fix: "throuhgh" should be "through". (GH-16704) 2019-10-10 20:43:13 -07:00
context.c bpo-43268: Pass interp rather than tstate to internal functions (GH-24580) 2021-02-19 15:10:45 +01:00
dtoa.c Revert "bpo-40521: Make dtoa bigint free list per-interpreter (GH-24821)" (GH-24964) 2021-03-22 11:58:59 +01:00
dup2.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
dynamic_annotations.c bpo-32241: Add the const qualifire to declarations of umodifiable strings. (#4748) 2017-12-12 13:55:04 +02:00
dynload_hpux.c bpo-41894: Fix UnicodeDecodeError while loading native module (GH-22466) 2020-10-15 10:53:27 +09:00
dynload_shlib.c bpo-41894: Fix UnicodeDecodeError while loading native module (GH-22466) 2020-10-15 10:53:27 +09:00
dynload_stub.c
dynload_win.c bpo-36346: Make using the legacy Unicode C API optional (GH-21437) 2020-07-10 23:26:06 +03:00
errors.c bpo-44094: Remove deprecated PyErr_ APIs. (GH-26011) 2021-05-13 13:45:26 -07:00
fileutils.c bpo-43667: Fix broken Unicode encoding in non-UTF locales on Solaris (GH-25096) 2021-04-30 15:21:42 +02:00
formatter_unicode.c bpo-28146: Fix a confusing error message in str.format() (GH-24213) 2021-05-13 13:55:55 -07:00
frozen.c bpo-43372: Use _freeze_importlib for regen-frozen. (GH-24759) 2021-03-06 13:34:03 -08:00
frozen_hello.h bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
frozenmain.c bpo-44131: Py_FrozenMain() uses PyConfig_SetBytesArgv() (GH-26201) 2021-05-20 12:08:05 +02:00
future.c bpo-38605: Revert making 'from __future__ import annotations' the default (GH-25490) 2021-04-21 12:41:19 +01:00
getargs.c bpo-40943: Fix skipitem() didn't raise SystemError (GH-25937) 2021-05-07 11:56:48 +09:00
getcompiler.c closes bpo-43278: remove unnecessary leading '\n' from COMPILER when build with GCC/Clang (GH-24606) 2021-02-25 20:24:21 -08:00
getcopyright.c Bring Python into the new year. (GH-24036) 2021-01-02 00:37:23 +09:00
getopt.c bpo-40527: Fix command line argument parsing (GH-19955) 2020-05-06 22:22:17 +09:00
getplatform.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
getversion.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
hamt.c bpo-29882: Add _Py_popcount32() function (GH-20518) 2020-06-08 16:30:33 +02:00
hashtable.c bpo-41061: Fix incorrect expressions in hashtable (GH-21028) 2020-06-22 00:41:48 -07:00
import.c bpo-43244: Remove Yield macro from pycore_ast.h (GH-25243) 2021-04-07 13:01:09 +02:00
importdl.c bpo-1635741: Fix ref leak in _PyWarnings_Init() error path (GH-23151) 2020-11-04 17:33:06 +01:00
importdl.h PEP 489: Multi-phase extension module initialization 2015-05-23 22:24:10 +10:00
importlib.h bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
importlib_external.h bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
importlib_zipimport.h bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
initconfig.c bpo-43510: Implement PEP 597 opt-in EncodingWarning. (GH-19481) 2021-03-29 12:28:14 +09:00
makeopcodetargets.py makeopcodetargets.py: we need to import Lib/opcode.py 2016-03-26 01:04:37 +01:00
marshal.c bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
modsupport.c bpo-1635741: Add PyModule_AddObjectRef() function (GH-23122) 2020-11-04 13:59:15 +01:00
mysnprintf.c bpo-36020: Require vsnprintf() to build Python (GH-20899) 2020-06-16 00:54:44 +02:00
mystrtoul.c bpo-37752: Delete redundant Py_CHARMASK in normalizestring() (GH-15095) 2019-09-10 17:04:08 +01:00
opcode_targets.h bpo-26110: Add `CALL_METHOD_KW` opcode to speedup method calls with keywords (GH-26014) 2021-05-15 16:15:23 +01:00
pathconfig.c bpo-42260: Fix _PyConfig_Read() if compute_path_config=0 (GH-23220) 2020-11-10 21:10:22 +01:00
preconfig.c bpo-43510: Implement PEP 597 opt-in EncodingWarning. (GH-19481) 2021-03-29 12:28:14 +09:00
pyarena.c bpo-43244: Remove the pyarena.h header (GH-25007) 2021-03-24 02:23:01 +01:00
pyctype.c
pyfpe.c bpo-29137: Remove fpectl module (#4789) 2018-01-05 23:15:34 -08:00
pyhash.c bpo-43475: Fix worst case collision behavior for NaN instances (GH-25493) 2021-04-22 08:34:57 -07:00
pylifecycle.c bpo-43680: _pyio.open() becomes a static method (GH-25354) 2021-04-12 10:44:53 +02:00
pymath.c bpo-29782: Consolidate _Py_Bit_Length() (GH-20739) 2020-06-15 14:33:48 +02:00
pystate.c bpo-43879: Add native_thread_id field to PyThreadState (GH-25458) 2021-05-26 16:40:14 +02:00
pystrcmp.c bpo-41524: fix pointer bug in PyOS_mystr{n}icmp (GH-21845) 2020-08-27 14:45:25 +09:00
pystrhex.c bpo-40313: speed up bytes.hex() (GH-19594) 2020-04-20 17:17:52 -07:00
pystrtod.c bpo-42519: Replace PyMem_MALLOC() with PyMem_Malloc() (GH-23586) 2020-12-01 09:56:42 +01:00
Python-ast.c bpo-43892: Make match patterns explicit in the AST (GH-25585) 2021-04-28 22:58:44 -07:00
pythonrun.c bpo-43914: Highlight invalid ranges in SyntaxErrors (#25525) 2021-04-23 14:27:05 +01:00
pytime.c bpo-37205: time.time() cannot fail with fatal error (GH-23314) 2020-11-16 16:08:05 +01:00
README Issue #18093: Factor out the programs that embed the runtime 2014-07-25 21:52:14 +10:00
stdlib_module_names.h bpo-42955: Add _overlapped to sys.stdlib_module_names (GH-25122) 2021-04-01 02:28:23 +02:00
structmember.c bpo-40268: Remove unused structmember.h includes (GH-19530) 2020-04-15 02:35:41 +02:00
suggestions.c bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) 2021-06-03 10:28:27 -06:00
symtable.c bpo-42725: Render annotations effectless on symbol table with PEP 563 (GH-25583) 2021-05-03 10:43:00 +03:00
sysmodule.c bpo-44113: Fix compiler warning in PySys_AddWarnOption() (GH-26084) 2021-05-13 02:27:56 +02:00
thread.c bpo-40268: Remove explicit pythread.h includes (#19529) 2020-04-15 02:04:42 +02:00
thread_nt.h bpo-40268: Rename _PyInterpreterState_GET_UNSAFE() (GH-19509) 2020-04-14 15:14:01 +02:00
thread_pthread.h bpo-31904: Define THREAD_STACK_SIZE for VxWorks (GH-23718) 2020-12-09 22:47:28 +01:00
traceback.c bpo-42800: Rename AUDIT_READ to PY_AUDIT_READ (GH-25736) 2021-04-30 01:08:55 +01:00
wordcode_helpers.h bpo-31338 (#3374) 2017-09-14 18:13:16 -07:00

README 

Miscellaneous source files for the main Python shared library