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GH-108716: Turn off deep-freezing of code objects. (GH-108722)

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Mark Shannon 2023-09-08 10:34:40 +01:00 committed by GitHub
parent 00cf626cd4
commit 15d4c9fabc
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15 changed files with 50 additions and 86 deletions
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1
Include/cpython/import.h
View file

@ -17,7 +17,6 @@ struct _frozen {
const unsigned char *code;
int size;
int is_package;
PyObject *(*get_code)(void);
};
/* Embedding apps may change this pointer to point to their favorite

2
Include/internal/pycore_code.h
View file

@ -465,8 +465,6 @@ adaptive_counter_backoff(uint16_t counter) {
return adaptive_counter_bits(value, backoff);
}
extern uint32_t _Py_next_func_version;
/* Comparison bit masks. */

1
Include/internal/pycore_interp.h
View file

@ -186,6 +186,7 @@ struct _is {
_PyOptimizerObject *optimizer;
uint16_t optimizer_resume_threshold;
uint16_t optimizer_backedge_threshold;
uint32_t next_func_version;
_Py_GlobalMonitors monitors;
bool f_opcode_trace_set;

1
Lib/test/test_ctypes/test_values.py
View file

@ -58,7 +58,6 @@ class struct_frozen(Structure):
("code", POINTER(c_ubyte)),
("size", c_int),
("is_package", c_int),
("get_code", POINTER(c_ubyte)), # Function ptr
]
FrozenTable = POINTER(struct_frozen)

1
Makefile.pre.in
View file

@ -505,7 +505,6 @@ LIBRARY_OBJS_OMIT_FROZEN= \
LIBRARY_OBJS= \
$(LIBRARY_OBJS_OMIT_FROZEN) \
$(DEEPFREEZE_OBJS) \
Modules/getpath.o \
Python/frozen.o

2
Misc/NEWS.d/next/Core and Builtins/2023-08-28-03-38-28.gh-issue-108716.HJBPwt.rst Normal file
View file

@ -0,0 +1,2 @@
Turn off deep-freezing of code objects. Modules are still frozen, so that a
file system search is not needed for common modules.

7
Objects/codeobject.c
View file

@ -427,9 +427,10 @@ init_code(PyCodeObject *co, struct _PyCodeConstructor *con)
co->co_framesize = nlocalsplus + con->stacksize + FRAME_SPECIALS_SIZE;
co->co_ncellvars = ncellvars;
co->co_nfreevars = nfreevars;
co->co_version = _Py_next_func_version;
if (_Py_next_func_version != 0) {
_Py_next_func_version++;
PyInterpreterState *interp = _PyInterpreterState_GET();
co->co_version = interp->next_func_version;
if (interp->next_func_version != 0) {
interp->next_func_version++;
}
co->_co_monitoring = NULL;
co->_co_instrumentation_version = 0;

9
Objects/funcobject.c
View file

@ -3,7 +3,6 @@
#include "Python.h"
#include "pycore_ceval.h" // _PyEval_BuiltinsFromGlobals()
#include "pycore_code.h" // _Py_next_func_version
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "pycore_pyerrors.h" // _PyErr_Occurred()
@ -252,11 +251,9 @@ When the function version is 0, the `CALL` bytecode is not specialized.
Code object versions
--------------------
So where to code objects get their `co_version`? There is a single
static global counter, `_Py_next_func_version`. This is initialized in
the generated (!) file `Python/deepfreeze/deepfreeze.c`, to 1 plus the
number of deep-frozen function objects in that file.
(In `_bootstrap_python.c` and `freeze_module.c` it is initialized to 1.)
So where to code objects get their `co_version`?
There is a per-interpreter counter, `next_func_version`.
This is initialized to 1 when the interpreter is created.
Code objects get a new `co_version` allocated from this counter upon
creation. Since code objects are nominally immutable, `co_version` can

2
Programs/_bootstrap_python.c
View file

@ -15,8 +15,6 @@
#include "Python/frozen_modules/zipimport.h"
/* End includes */
uint32_t _Py_next_func_version = 1;
/* Empty initializer for deepfrozen modules */
int _Py_Deepfreeze_Init(void)
{

2
Programs/_freeze_module.c
View file

@ -22,8 +22,6 @@
# include <unistd.h>
#endif
uint32_t _Py_next_func_version = 1;
/* Empty initializer for deepfrozen modules */
int _Py_Deepfreeze_Init(void)
{

58
Python/frozen.c
View file

@ -101,46 +101,46 @@ extern PyObject *_Py_get_frozen_only_toplevel(void);
/* End extern declarations */
static const struct _frozen bootstrap_modules[] = {
{"_frozen_importlib", _Py_M__importlib__bootstrap, (int)sizeof(_Py_M__importlib__bootstrap), false, GET_CODE(importlib__bootstrap)},
{"_frozen_importlib_external", _Py_M__importlib__bootstrap_external, (int)sizeof(_Py_M__importlib__bootstrap_external), false, GET_CODE(importlib__bootstrap_external)},
{"zipimport", _Py_M__zipimport, (int)sizeof(_Py_M__zipimport), false, GET_CODE(zipimport)},
{"_frozen_importlib", _Py_M__importlib__bootstrap, (int)sizeof(_Py_M__importlib__bootstrap), false},
{"_frozen_importlib_external", _Py_M__importlib__bootstrap_external, (int)sizeof(_Py_M__importlib__bootstrap_external), false},
{"zipimport", _Py_M__zipimport, (int)sizeof(_Py_M__zipimport), false},
{0, 0, 0} /* bootstrap sentinel */
};
static const struct _frozen stdlib_modules[] = {
/* stdlib - startup, without site (python -S) */
{"abc", _Py_M__abc, (int)sizeof(_Py_M__abc), false, GET_CODE(abc)},
{"codecs", _Py_M__codecs, (int)sizeof(_Py_M__codecs), false, GET_CODE(codecs)},
{"io", _Py_M__io, (int)sizeof(_Py_M__io), false, GET_CODE(io)},
{"abc", _Py_M__abc, (int)sizeof(_Py_M__abc), false},
{"codecs", _Py_M__codecs, (int)sizeof(_Py_M__codecs), false},
{"io", _Py_M__io, (int)sizeof(_Py_M__io), false},
/* stdlib - startup, with site */
{"_collections_abc", _Py_M___collections_abc, (int)sizeof(_Py_M___collections_abc), false, GET_CODE(_collections_abc)},
{"_sitebuiltins", _Py_M___sitebuiltins, (int)sizeof(_Py_M___sitebuiltins), false, GET_CODE(_sitebuiltins)},
{"genericpath", _Py_M__genericpath, (int)sizeof(_Py_M__genericpath), false, GET_CODE(genericpath)},
{"ntpath", _Py_M__ntpath, (int)sizeof(_Py_M__ntpath), false, GET_CODE(ntpath)},
{"posixpath", _Py_M__posixpath, (int)sizeof(_Py_M__posixpath), false, GET_CODE(posixpath)},
{"os.path", _Py_M__posixpath, (int)sizeof(_Py_M__posixpath), false, GET_CODE(posixpath)},
{"os", _Py_M__os, (int)sizeof(_Py_M__os), false, GET_CODE(os)},
{"site", _Py_M__site, (int)sizeof(_Py_M__site), false, GET_CODE(site)},
{"stat", _Py_M__stat, (int)sizeof(_Py_M__stat), false, GET_CODE(stat)},
{"_collections_abc", _Py_M___collections_abc, (int)sizeof(_Py_M___collections_abc), false},
{"_sitebuiltins", _Py_M___sitebuiltins, (int)sizeof(_Py_M___sitebuiltins), false},
{"genericpath", _Py_M__genericpath, (int)sizeof(_Py_M__genericpath), false},
{"ntpath", _Py_M__ntpath, (int)sizeof(_Py_M__ntpath), false},
{"posixpath", _Py_M__posixpath, (int)sizeof(_Py_M__posixpath), false},
{"os.path", _Py_M__posixpath, (int)sizeof(_Py_M__posixpath), false},
{"os", _Py_M__os, (int)sizeof(_Py_M__os), false},
{"site", _Py_M__site, (int)sizeof(_Py_M__site), false},
{"stat", _Py_M__stat, (int)sizeof(_Py_M__stat), false},
/* runpy - run module with -m */
{"importlib.util", _Py_M__importlib_util, (int)sizeof(_Py_M__importlib_util), false, GET_CODE(importlib_util)},
{"importlib.machinery", _Py_M__importlib_machinery, (int)sizeof(_Py_M__importlib_machinery), false, GET_CODE(importlib_machinery)},
{"runpy", _Py_M__runpy, (int)sizeof(_Py_M__runpy), false, GET_CODE(runpy)},
{"importlib.util", _Py_M__importlib_util, (int)sizeof(_Py_M__importlib_util), false},
{"importlib.machinery", _Py_M__importlib_machinery, (int)sizeof(_Py_M__importlib_machinery), false},
{"runpy", _Py_M__runpy, (int)sizeof(_Py_M__runpy), false},
{0, 0, 0} /* stdlib sentinel */
};
static const struct _frozen test_modules[] = {
{"__hello__", _Py_M____hello__, (int)sizeof(_Py_M____hello__), false, GET_CODE(__hello__)},
{"__hello_alias__", _Py_M____hello__, (int)sizeof(_Py_M____hello__), false, GET_CODE(__hello__)},
{"__phello_alias__", _Py_M____hello__, (int)sizeof(_Py_M____hello__), true, GET_CODE(__hello__)},
{"__phello_alias__.spam", _Py_M____hello__, (int)sizeof(_Py_M____hello__), false, GET_CODE(__hello__)},
{"__phello__", _Py_M____phello__, (int)sizeof(_Py_M____phello__), true, GET_CODE(__phello__)},
{"__phello__.__init__", _Py_M____phello__, (int)sizeof(_Py_M____phello__), false, GET_CODE(__phello__)},
{"__phello__.ham", _Py_M____phello___ham, (int)sizeof(_Py_M____phello___ham), true, GET_CODE(__phello___ham)},
{"__phello__.ham.__init__", _Py_M____phello___ham, (int)sizeof(_Py_M____phello___ham), false, GET_CODE(__phello___ham)},
{"__phello__.ham.eggs", _Py_M____phello___ham_eggs, (int)sizeof(_Py_M____phello___ham_eggs), false, GET_CODE(__phello___ham_eggs)},
{"__phello__.spam", _Py_M____phello___spam, (int)sizeof(_Py_M____phello___spam), false, GET_CODE(__phello___spam)},
{"__hello_only__", _Py_M__frozen_only, (int)sizeof(_Py_M__frozen_only), false, GET_CODE(frozen_only)},
{"__hello__", _Py_M____hello__, (int)sizeof(_Py_M____hello__), false},
{"__hello_alias__", _Py_M____hello__, (int)sizeof(_Py_M____hello__), false},
{"__phello_alias__", _Py_M____hello__, (int)sizeof(_Py_M____hello__), true},
{"__phello_alias__.spam", _Py_M____hello__, (int)sizeof(_Py_M____hello__), false},
{"__phello__", _Py_M____phello__, (int)sizeof(_Py_M____phello__), true},
{"__phello__.__init__", _Py_M____phello__, (int)sizeof(_Py_M____phello__), false},
{"__phello__.ham", _Py_M____phello___ham, (int)sizeof(_Py_M____phello___ham), true},
{"__phello__.ham.__init__", _Py_M____phello___ham, (int)sizeof(_Py_M____phello___ham), false},
{"__phello__.ham.eggs", _Py_M____phello___ham_eggs, (int)sizeof(_Py_M____phello___ham_eggs), false},
{"__phello__.spam", _Py_M____phello___spam, (int)sizeof(_Py_M____phello___spam), false},
{"__hello_only__", _Py_M__frozen_only, (int)sizeof(_Py_M__frozen_only), false},
{0, 0, 0} /* test sentinel */
};
const struct _frozen *_PyImport_FrozenBootstrap = bootstrap_modules;

13
Python/import.c
View file

@ -2006,7 +2006,6 @@ look_up_frozen(const char *name)
struct frozen_info {
PyObject *nameobj;
const char *data;
PyObject *(*get_code)(void);
Py_ssize_t size;
bool is_package;
bool is_alias;
@ -2040,7 +2039,6 @@ find_frozen(PyObject *nameobj, struct frozen_info *info)
if (info != NULL) {
info->nameobj = nameobj; // borrowed
info->data = (const char *)p->code;
info->get_code = p->get_code;
info->size = p->size;
info->is_package = p->is_package;
if (p->size < 0) {
@ -2052,10 +2050,6 @@ find_frozen(PyObject *nameobj, struct frozen_info *info)
info->is_alias = resolve_module_alias(name, _PyImport_FrozenAliases,
&info->origname);
}
if (p->code == NULL && p->size == 0 && p->get_code != NULL) {
/* It is only deepfrozen. */
return FROZEN_OKAY;
}
if (p->code == NULL) {
/* It is frozen but marked as un-importable. */
return FROZEN_EXCLUDED;
@ -2070,11 +2064,6 @@ find_frozen(PyObject *nameobj, struct frozen_info *info)
static PyObject *
unmarshal_frozen_code(PyInterpreterState *interp, struct frozen_info *info)
{
if (info->get_code && _Py_IsMainInterpreter(interp)) {
PyObject *code = info->get_code();
assert(code != NULL);
return code;
}
PyObject *co = PyMarshal_ReadObjectFromString(info->data, info->size);
if (co == NULL) {
/* Does not contain executable code. */
@ -3567,7 +3556,7 @@ _imp_get_frozen_object_impl(PyObject *module, PyObject *name,
if (info.nameobj == NULL) {
info.nameobj = name;
}
if (info.size == 0 && info.get_code == NULL) {
if (info.size == 0) {
/* Does not contain executable code. */
set_frozen_error(FROZEN_INVALID, name);
return NULL;

6
Python/pylifecycle.c
View file

@ -832,11 +832,6 @@ pycore_interp_init(PyThreadState *tstate)
if (_PyStatus_EXCEPTION(status)) {
return status;
}
// Intern strings in deep-frozen modules first so that others
// can use it instead of creating a heap allocated string.
if (_Py_Deepfreeze_Init() < 0) {
return _PyStatus_ERR("failed to initialize deep-frozen modules");
}
status = pycore_init_types(interp);
if (_PyStatus_EXCEPTION(status)) {
@ -1743,7 +1738,6 @@ finalize_interp_clear(PyThreadState *tstate)
_Py_HashRandomization_Fini();
_PyArg_Fini();
_Py_ClearFileSystemEncoding();
_Py_Deepfreeze_Fini();
_PyPerfTrampoline_Fini();
}

1
Python/pystate.c
View file

@ -697,6 +697,7 @@ init_interpreter(PyInterpreterState *interp,
interp->optimizer = &_PyOptimizer_Default;
interp->optimizer_backedge_threshold = _PyOptimizer_Default.backedge_threshold;
interp->optimizer_resume_threshold = _PyOptimizer_Default.backedge_threshold;
interp->next_func_version = 1;
if (interp != &runtime->_main_interpreter) {
/* Fix the self-referential, statically initialized fields. */
interp->dtoa = (struct _dtoa_state)_dtoa_state_INIT(interp);

30
Tools/build/freeze_modules.py
View file

@ -467,15 +467,14 @@ def replace_block(lines, start_marker, end_marker, replacements, file):
return lines[:start_pos + 1] + replacements + lines[end_pos:]
def regen_frozen(modules, frozen_modules: bool):
def regen_frozen(modules):
headerlines = []
parentdir = os.path.dirname(FROZEN_FILE)
if frozen_modules:
for src in _iter_sources(modules):
# Adding a comment to separate sections here doesn't add much,
# so we don't.
header = relpath_for_posix_display(src.frozenfile, parentdir)
headerlines.append(f'#include "{header}"')
for src in _iter_sources(modules):
# Adding a comment to separate sections here doesn't add much,
# so we don't.
header = relpath_for_posix_display(src.frozenfile, parentdir)
headerlines.append(f'#include "{header}"')
externlines = []
bootstraplines = []
@ -504,14 +503,9 @@ def regen_frozen(modules, frozen_modules: bool):
get_code_name = "_Py_get_%s_toplevel" % code_name
externlines.append("extern PyObject *%s(void);" % get_code_name)
symbol = mod.symbol
pkg = 'true' if mod.ispkg else 'false'
if not frozen_modules:
line = ('{"%s", NULL, 0, %s, GET_CODE(%s)},'
) % (mod.name, pkg, code_name)
else:
line = ('{"%s", %s, (int)sizeof(%s), %s, GET_CODE(%s)},'
) % (mod.name, symbol, symbol, pkg, code_name)
size = f"(int)sizeof({mod.symbol})"
line = f'{{"{mod.name}", {mod.symbol}, {size}, {pkg}}},'
lines.append(line)
if mod.isalias:
@ -718,20 +712,14 @@ def regen_pcbuild(modules):
#######################################
# the script
parser = argparse.ArgumentParser()
parser.add_argument("--frozen-modules", action="store_true",
help="Use both frozen and deepfrozen modules. (default: uses only deepfrozen modules)")
def main():
args = parser.parse_args()
frozen_modules: bool = args.frozen_modules
# Expand the raw specs, preserving order.
modules = list(parse_frozen_specs())
# Regen build-related files.
regen_makefile(modules)
regen_pcbuild(modules)
regen_frozen(modules, frozen_modules)
regen_frozen(modules)
if __name__ == '__main__':