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bpo-38304: Add PyConfig.struct_size (GH-16451)

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Add a new struct_size field to PyPreConfig and PyConfig structures to
allow to modify these structures in the future without breaking the
backward compatibility.

* Replace private _config_version field with public struct_size field
  in PyPreConfig and PyConfig.
* Public PyPreConfig_InitIsolatedConfig() and
  PyPreConfig_InitPythonConfig()
  return type becomes PyStatus, instead of void.
* Internal _PyConfig_InitCompatConfig(),
  _PyPreConfig_InitCompatConfig(), _PyPreConfig_InitFromConfig(),
  _PyPreConfig_InitFromPreConfig() return type becomes PyStatus,
  instead of void.
* Remove _Py_CONFIG_VERSION
* Update the Initialization Configuration documentation.
This commit is contained in:
Victor Stinner 2019-09-28 04:28:35 +02:00 • committed by GitHub
parent 52d1b86bde
commit 441b10cf28
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GPG key ID: 4AEE18F83AFDEB23
13 changed files with 350 additions and 60 deletions
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88
Python/preconfig.c
View file

@ -269,12 +269,30 @@ _PyPreCmdline_Read(_PyPreCmdline *cmdline, const PyPreConfig *preconfig)
/* --- PyPreConfig ----------------------------------------------- */
void
static PyStatus
preconfig_check_struct_size(PyPreConfig *config)
{
if (config->struct_size != sizeof(PyPreConfig)) {
return _PyStatus_ERR("unsupported PyPreConfig structure size "
"(Python version mismatch?)");
}
return _PyStatus_OK();
}
PyStatus
_PyPreConfig_InitCompatConfig(PyPreConfig *config)
{
size_t struct_size = config->struct_size;
memset(config, 0, sizeof(*config));
config->struct_size = struct_size;
PyStatus status = preconfig_check_struct_size(config);
if (_PyStatus_EXCEPTION(status)) {
_PyStatus_UPDATE_FUNC(status);
return status;
}
config->_config_version = _Py_CONFIG_VERSION;
config->_config_init = (int)_PyConfig_INIT_COMPAT;
config->parse_argv = 0;
config->isolated = -1;
@ -295,13 +313,18 @@ _PyPreConfig_InitCompatConfig(PyPreConfig *config)
#ifdef MS_WINDOWS
config->legacy_windows_fs_encoding = -1;
#endif
return _PyStatus_OK();
}
void
PyStatus
PyPreConfig_InitPythonConfig(PyPreConfig *config)
{
_PyPreConfig_InitCompatConfig(config);
PyStatus status = _PyPreConfig_InitCompatConfig(config);
if (_PyStatus_EXCEPTION(status)) {
_PyStatus_UPDATE_FUNC(status);
return status;
}
config->_config_init = (int)_PyConfig_INIT_PYTHON;
config->isolated = 0;
@ -316,13 +339,18 @@ PyPreConfig_InitPythonConfig(PyPreConfig *config)
#ifdef MS_WINDOWS
config->legacy_windows_fs_encoding = 0;
#endif
return _PyStatus_OK();
}
void
PyStatus
PyPreConfig_InitIsolatedConfig(PyPreConfig *config)
{
_PyPreConfig_InitCompatConfig(config);
PyStatus status = _PyPreConfig_InitCompatConfig(config);
if (_PyStatus_EXCEPTION(status)) {
_PyStatus_UPDATE_FUNC(status);
return status;
}
config->_config_init = (int)_PyConfig_INIT_ISOLATED;
config->configure_locale = 0;
@ -333,41 +361,55 @@ PyPreConfig_InitIsolatedConfig(PyPreConfig *config)
#ifdef MS_WINDOWS
config->legacy_windows_fs_encoding = 0;
#endif
return _PyStatus_OK();
}
void
PyStatus
_PyPreConfig_InitFromPreConfig(PyPreConfig *config,
const PyPreConfig *config2)
{
PyPreConfig_InitPythonConfig(config);
PyStatus status = PyPreConfig_InitPythonConfig(config);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
preconfig_copy(config, config2);
return _PyStatus_OK();
}
void
PyStatus
_PyPreConfig_InitFromConfig(PyPreConfig *preconfig, const PyConfig *config)
{
PyStatus status;
_PyConfigInitEnum config_init = (_PyConfigInitEnum)config->_config_init;
switch (config_init) {
case _PyConfig_INIT_PYTHON:
PyPreConfig_InitPythonConfig(preconfig);
status = PyPreConfig_InitPythonConfig(preconfig);
break;
case _PyConfig_INIT_ISOLATED:
PyPreConfig_InitIsolatedConfig(preconfig);
status = PyPreConfig_InitIsolatedConfig(preconfig);
break;
case _PyConfig_INIT_COMPAT:
default:
_PyPreConfig_InitCompatConfig(preconfig);
status = _PyPreConfig_InitCompatConfig(preconfig);
}
if (_PyStatus_EXCEPTION(status)) {
return status;
}
_PyPreConfig_GetConfig(preconfig, config);
return _PyStatus_OK();
}
static void
preconfig_copy(PyPreConfig *config, const PyPreConfig *config2)
{
assert(config2->_config_version == _Py_CONFIG_VERSION);
assert(config->struct_size == sizeof(PyPreConfig));
#define COPY_ATTR(ATTR) config->ATTR = config2->ATTR
COPY_ATTR(_config_init);
@ -787,6 +829,12 @@ _PyPreConfig_Read(PyPreConfig *config, const _PyArgv *args)
return status;
}
status = preconfig_check_struct_size(config);
if (_PyStatus_EXCEPTION(status)) {
_PyStatus_UPDATE_FUNC(status);
return status;
}
preconfig_get_global_vars(config);
/* Copy LC_CTYPE locale, since it's modified later */
@ -801,7 +849,12 @@ _PyPreConfig_Read(PyPreConfig *config, const _PyArgv *args)
/* Save the config to be able to restore it if encodings change */
PyPreConfig save_config;
_PyPreConfig_InitFromPreConfig(&save_config, config);
save_config.struct_size = sizeof(PyPreConfig);
status = _PyPreConfig_InitFromPreConfig(&save_config, config);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
/* Set LC_CTYPE to the user preferred locale */
if (config->configure_locale) {
@ -923,7 +976,12 @@ PyStatus
_PyPreConfig_Write(const PyPreConfig *src_config)
{
PyPreConfig config;
_PyPreConfig_InitFromPreConfig(&config, src_config);
config.struct_size = sizeof(PyPreConfig);
PyStatus status = _PyPreConfig_InitFromPreConfig(&config, src_config);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (_PyRuntime.core_initialized) {
/* bpo-34008: Calling this functions after Py_Initialize() ignores