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bpo-46608: exclude marshalled-frozen data if deep-freezing to save 300 KB space (GH-31074)

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This reduces the size of the data segment by **300 KB** of the executable because if the modules are deep-frozen then the marshalled frozen data just wastes space. This was inspired by comment by @gvanrossum in https://github.com/python/cpython/pull/29118#issuecomment-958521863. Note: There is a new option `--deepfreeze-only` in `freeze_modules.py` to change this behavior, it is on be default to save disk space.
```console 
# du -s ./python before
27892   ./python
# du -s ./python after
27524   ./python
```

Automerge-Triggered-By: GH:ericsnowcurrently
This commit is contained in:
Kumar Aditya 2022-02-04 23:27:03 +05:30 • committed by GitHub
parent 9b4e3d94a5
commit bf95ff91f2
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 87 additions and 84 deletions
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16
Python/import.c
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@ -1297,13 +1297,21 @@ find_frozen(PyObject *nameobj, struct frozen_info *info)
info->nameobj = nameobj; // borrowed
info->data = (const char *)p->code;
info->get_code = p->get_code;
info->size = p->size < 0 ? -(p->size) : p->size;
info->is_package = p->size < 0 ? true : false;
info->size = p->size;
info->is_package = p->is_package;
if (p->size < 0) {
// backward compatibility with negative size values
info->size = -(p->size);
info->is_package = true;
}
info->origname = name;
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;
@ -2224,7 +2232,7 @@ _imp_get_frozen_object_impl(PyObject *module, PyObject *name,
if (info.nameobj == NULL) {
info.nameobj = name;
}
if (info.size == 0) {
if (info.size == 0 && info.get_code == NULL) {
/* Does not contain executable code. */
set_frozen_error(FROZEN_INVALID, name);
return NULL;