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Doing this provides significant performance gains for runtime startup (~15% with all the imported modules frozen). We don't yet freeze all the imported modules because there are a few hiccups in the build systems we need to sort out first. (See bpo-45186 and bpo-45188.) Note that in PR GH-28320 we added a command-line flag (-X frozen_modules=[on|off]) that allows users to opt out of (or into) using frozen modules. The default is still "off" but we will change it to "on" as soon as we can do it in a way that does not cause contributors pain. https://bugs.python.org/issue45020
87 lines
3.5 KiB
C
87 lines
3.5 KiB
C
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/* Frozen modules initializer
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*
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* Frozen modules are written to header files by Programs/_freeze_module.
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* These files are typically put in Python/frozen_modules/. Each holds
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* an array of bytes named "_Py_M__<module>", which is used below.
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*
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* These files must be regenerated any time the corresponding .pyc
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* file would change (including with changes to the compiler, bytecode
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* format, marshal format). This can be done with "make regen-frozen".
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* That make target just runs Tools/scripts/freeze_modules.py.
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*
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* The freeze_modules.py script also determines which modules get
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* frozen. Update the list at the top of the script to add, remove,
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* or modify the target modules. Then run the script
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* (or run "make regen-frozen").
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*
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* The script does the following:
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*
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* 1. run Programs/_freeze_module on the target modules
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* 2. update the includes and _PyImport_FrozenModules[] in this file
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* 3. update the FROZEN_FILES variable in Makefile.pre.in
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* 4. update the per-module targets in Makefile.pre.in
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* 5. update the lists of modules in PCbuild/_freeze_module.vcxproj and
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* PCbuild/_freeze_module.vcxproj.filters
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*
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* (Note that most of the data in this file is auto-generated by the script.)
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*
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* Those steps can also be done manually, though this is not recommended.
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* Expect such manual changes to be removed the next time
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* freeze_modules.py runs.
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* */
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/* In order to test the support for frozen modules, by default we
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define some simple frozen modules: __hello__, __phello__ (a package),
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and __phello__.spam. Loading any will print some famous words... */
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#include "Python.h"
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/* Includes for frozen modules: */
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#include "frozen_modules/importlib__bootstrap.h"
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#include "frozen_modules/importlib__bootstrap_external.h"
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#include "frozen_modules/zipimport.h"
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#include "frozen_modules/abc.h"
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#include "frozen_modules/io.h"
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#include "frozen_modules/_collections_abc.h"
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#include "frozen_modules/_sitebuiltins.h"
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#include "frozen_modules/genericpath.h"
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#include "frozen_modules/ntpath.h"
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#include "frozen_modules/posixpath.h"
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#include "frozen_modules/stat.h"
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#include "frozen_modules/hello.h"
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/* End includes */
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/* Note that a negative size indicates a package. */
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static const struct _frozen _PyImport_FrozenModules[] = {
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/* import system */
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{"_frozen_importlib", _Py_M__importlib__bootstrap,
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(int)sizeof(_Py_M__importlib__bootstrap)},
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{"_frozen_importlib_external", _Py_M__importlib__bootstrap_external,
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(int)sizeof(_Py_M__importlib__bootstrap_external)},
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{"zipimport", _Py_M__zipimport, (int)sizeof(_Py_M__zipimport)},
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/* stdlib */
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{"abc", _Py_M__abc, (int)sizeof(_Py_M__abc)},
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{"io", _Py_M__io, (int)sizeof(_Py_M__io)},
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{"_collections_abc", _Py_M___collections_abc,
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(int)sizeof(_Py_M___collections_abc)},
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{"_sitebuiltins", _Py_M___sitebuiltins, (int)sizeof(_Py_M___sitebuiltins)},
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{"genericpath", _Py_M__genericpath, (int)sizeof(_Py_M__genericpath)},
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{"ntpath", _Py_M__ntpath, (int)sizeof(_Py_M__ntpath)},
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{"posixpath", _Py_M__posixpath, (int)sizeof(_Py_M__posixpath)},
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{"stat", _Py_M__stat, (int)sizeof(_Py_M__stat)},
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/* Test module */
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{"__hello__", _Py_M__hello, (int)sizeof(_Py_M__hello)},
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{"__phello__", _Py_M__hello, -(int)sizeof(_Py_M__hello)},
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{"__phello__.spam", _Py_M__hello, (int)sizeof(_Py_M__hello)},
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{0, 0, 0} /* sentinel */
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};
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/* Embedding apps may change this pointer to point to their favorite
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collection of frozen modules: */
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const struct _frozen *PyImport_FrozenModules = _PyImport_FrozenModules;
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