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bpo-28411: Isolate PyInterpreterState.modules (#3575)

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A bunch of code currently uses PyInterpreterState.modules directly instead of PyImport_GetModuleDict(). This complicates efforts to make changes relative to sys.modules. This patch switches to using PyImport_GetModuleDict() uniformly. Also, a number of related uses of sys.modules are updated for uniformity for the same reason.

Note that this code was already reviewed and merged as part of #1638. I reverted that and am now splitting it up into more focused parts.
This commit is contained in:
Eric Snow 2017-09-14 12:18:12 -06:00 • committed by GitHub
parent 8dcf22f442
commit d393c1b227
10 changed files with 116 additions and 55 deletions
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60
Python/pylifecycle.c
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@ -675,9 +675,20 @@ void _Py_InitializeCore(const _PyCoreConfig *config)
if (!_PyFloat_Init())
Py_FatalError("Py_InitializeCore: can't init float");
interp->modules = PyDict_New();
if (interp->modules == NULL)
PyObject *modules = PyDict_New();
if (modules == NULL)
Py_FatalError("Py_InitializeCore: can't make modules dictionary");
interp->modules = modules;
sysmod = _PySys_BeginInit();
if (sysmod == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys");
interp->sysdict = PyModule_GetDict(sysmod);
if (interp->sysdict == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys dict");
Py_INCREF(interp->sysdict);
PyDict_SetItemString(interp->sysdict, "modules", modules);
_PyImport_FixupBuiltin(sysmod, "sys", modules);
/* Init Unicode implementation; relies on the codec registry */
if (_PyUnicode_Init() < 0)
@ -689,7 +700,7 @@ void _Py_InitializeCore(const _PyCoreConfig *config)
bimod = _PyBuiltin_Init();
if (bimod == NULL)
Py_FatalError("Py_InitializeCore: can't initialize builtins modules");
_PyImport_FixupBuiltin(bimod, "builtins");
_PyImport_FixupBuiltin(bimod, "builtins", modules);
interp->builtins = PyModule_GetDict(bimod);
if (interp->builtins == NULL)
Py_FatalError("Py_InitializeCore: can't initialize builtins dict");
@ -698,17 +709,6 @@ void _Py_InitializeCore(const _PyCoreConfig *config)
/* initialize builtin exceptions */
_PyExc_Init(bimod);
sysmod = _PySys_BeginInit();
if (sysmod == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys");
interp->sysdict = PyModule_GetDict(sysmod);
if (interp->sysdict == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys dict");
Py_INCREF(interp->sysdict);
_PyImport_FixupBuiltin(sysmod, "sys");
PyDict_SetItemString(interp->sysdict, "modules",
interp->modules);
/* Set up a preliminary stderr printer until we have enough
infrastructure for the io module in place. */
pstderr = PyFile_NewStdPrinter(fileno(stderr));
@ -1211,9 +1211,23 @@ Py_NewInterpreter(void)
/* XXX The following is lax in error checking */
interp->modules = PyDict_New();
PyObject *modules = PyDict_New();
if (modules == NULL)
Py_FatalError("Py_NewInterpreter: can't make modules dictionary");
interp->modules = modules;
bimod = _PyImport_FindBuiltin("builtins");
sysmod = _PyImport_FindBuiltin("sys", modules);
if (sysmod != NULL) {
interp->sysdict = PyModule_GetDict(sysmod);
if (interp->sysdict == NULL)
goto handle_error;
Py_INCREF(interp->sysdict);
PyDict_SetItemString(interp->sysdict, "modules", modules);
PySys_SetPath(Py_GetPath());
_PySys_EndInit(interp->sysdict);
}
bimod = _PyImport_FindBuiltin("builtins", modules);
if (bimod != NULL) {
interp->builtins = PyModule_GetDict(bimod);
if (interp->builtins == NULL)
@ -1224,18 +1238,9 @@ Py_NewInterpreter(void)
/* initialize builtin exceptions */
_PyExc_Init(bimod);
sysmod = _PyImport_FindBuiltin("sys");
if (bimod != NULL && sysmod != NULL) {
PyObject *pstderr;
interp->sysdict = PyModule_GetDict(sysmod);
if (interp->sysdict == NULL)
goto handle_error;
Py_INCREF(interp->sysdict);
_PySys_EndInit(interp->sysdict);
PySys_SetPath(Py_GetPath());
PyDict_SetItemString(interp->sysdict, "modules",
interp->modules);
/* Set up a preliminary stderr printer until we have enough
infrastructure for the io module in place. */
pstderr = PyFile_NewStdPrinter(fileno(stderr));
@ -1911,9 +1916,8 @@ wait_for_thread_shutdown(void)
{
_Py_IDENTIFIER(_shutdown);
PyObject *result;
PyThreadState *tstate = PyThreadState_GET();
PyObject *threading = PyMapping_GetItemString(tstate->interp->modules,
"threading");
PyObject *modules = PyImport_GetModuleDict();
PyObject *threading = PyMapping_GetItemString(modules, "threading");
if (threading == NULL) {
/* threading not imported */
PyErr_Clear();