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import.c
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import.c
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/* Module definition and import implementation */
#include "Python.h"
#include "Python-ast.h"
#undef Yield /* undefine macro conflicting with winbase.h */
#include "internal/pystate.h"
#include "errcode.h"
#include "marshal.h"
#include "code.h"
#include "frameobject.h"
#include "osdefs.h"
#include "importdl.h"
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define CACHEDIR "__pycache__"
/* See _PyImport_FixupExtensionObject() below */
static PyObject *extensions = NULL;
/* This table is defined in config.c: */
extern struct _inittab _PyImport_Inittab[];
struct _inittab *PyImport_Inittab = _PyImport_Inittab;
static PyObject *initstr = NULL;
/*[clinic input]
module _imp
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=9c332475d8686284]*/
#include "clinic/import.c.h"
/* Initialize things */
void
_PyImport_Init(void)
{
PyInterpreterState *interp = PyThreadState_Get()->interp;
initstr = PyUnicode_InternFromString("__init__");
if (initstr == NULL)
Py_FatalError("Can't initialize import variables");
interp->builtins_copy = PyDict_Copy(interp->builtins);
if (interp->builtins_copy == NULL)
Py_FatalError("Can't backup builtins dict");
}
void
_PyImportHooks_Init(void)
{
PyObject *v, *path_hooks = NULL;
int err = 0;
/* adding sys.path_hooks and sys.path_importer_cache */
v = PyList_New(0);
if (v == NULL)
goto error;
err = PySys_SetObject("meta_path", v);
Py_DECREF(v);
if (err)
goto error;
v = PyDict_New();
if (v == NULL)
goto error;
err = PySys_SetObject("path_importer_cache", v);
Py_DECREF(v);
if (err)
goto error;
path_hooks = PyList_New(0);
if (path_hooks == NULL)
goto error;
err = PySys_SetObject("path_hooks", path_hooks);
if (err) {
error:
PyErr_Print();
Py_FatalError("initializing sys.meta_path, sys.path_hooks, "
"or path_importer_cache failed");
}
Py_DECREF(path_hooks);
}
void
_PyImportZip_Init(void)
{
PyObject *path_hooks, *zimpimport;
int err = 0;
path_hooks = PySys_GetObject("path_hooks");
if (path_hooks == NULL) {
PyErr_SetString(PyExc_RuntimeError, "unable to get sys.path_hooks");
goto error;
}
if (Py_VerboseFlag)
PySys_WriteStderr("# installing zipimport hook\n");
zimpimport = PyImport_ImportModule("zipimport");
if (zimpimport == NULL) {
PyErr_Clear(); /* No zip import module -- okay */
if (Py_VerboseFlag)
PySys_WriteStderr("# can't import zipimport\n");
}
else {
_Py_IDENTIFIER(zipimporter);
PyObject *zipimporter = _PyObject_GetAttrId(zimpimport,
&PyId_zipimporter);
Py_DECREF(zimpimport);
if (zipimporter == NULL) {
PyErr_Clear(); /* No zipimporter object -- okay */
if (Py_VerboseFlag)
PySys_WriteStderr(
"# can't import zipimport.zipimporter\n");
}
else {
/* sys.path_hooks.insert(0, zipimporter) */
err = PyList_Insert(path_hooks, 0, zipimporter);
Py_DECREF(zipimporter);
if (err < 0) {
goto error;
}
if (Py_VerboseFlag)
PySys_WriteStderr(
"# installed zipimport hook\n");
}
}
return;
error:
PyErr_Print();
Py_FatalError("initializing zipimport failed");
}
/* Locking primitives to prevent parallel imports of the same module
in different threads to return with a partially loaded module.
These calls are serialized by the global interpreter lock. */
#include "pythread.h"
static PyThread_type_lock import_lock = 0;
static unsigned long import_lock_thread = PYTHREAD_INVALID_THREAD_ID;
static int import_lock_level = 0;
void
_PyImport_AcquireLock(void)
{
unsigned long me = PyThread_get_thread_ident();
if (me == PYTHREAD_INVALID_THREAD_ID)
return; /* Too bad */
if (import_lock == NULL) {
import_lock = PyThread_allocate_lock();
if (import_lock == NULL)
return; /* Nothing much we can do. */
}
if (import_lock_thread == me) {
import_lock_level++;
return;
}
if (import_lock_thread != PYTHREAD_INVALID_THREAD_ID ||
!PyThread_acquire_lock(import_lock, 0))
{
PyThreadState *tstate = PyEval_SaveThread();
PyThread_acquire_lock(import_lock, 1);
PyEval_RestoreThread(tstate);
}
assert(import_lock_level == 0);
import_lock_thread = me;
import_lock_level = 1;
}
int
_PyImport_ReleaseLock(void)
{
unsigned long me = PyThread_get_thread_ident();
if (me == PYTHREAD_INVALID_THREAD_ID || import_lock == NULL)
return 0; /* Too bad */
if (import_lock_thread != me)
return -1;
import_lock_level--;
assert(import_lock_level >= 0);
if (import_lock_level == 0) {
import_lock_thread = PYTHREAD_INVALID_THREAD_ID;
PyThread_release_lock(import_lock);
}
return 1;
}
/* This function is called from PyOS_AfterFork_Child to ensure that newly
created child processes do not share locks with the parent.
We now acquire the import lock around fork() calls but on some platforms
(Solaris 9 and earlier? see isue7242) that still left us with problems. */
void
_PyImport_ReInitLock(void)
{
if (import_lock != NULL) {
import_lock = PyThread_allocate_lock();
if (import_lock == NULL) {
Py_FatalError("PyImport_ReInitLock failed to create a new lock");
}
}
if (import_lock_level > 1) {
/* Forked as a side effect of import */
unsigned long me = PyThread_get_thread_ident();
/* The following could fail if the lock is already held, but forking as
a side-effect of an import is a) rare, b) nuts, and c) difficult to
do thanks to the lock only being held when doing individual module
locks per import. */
PyThread_acquire_lock(import_lock, NOWAIT_LOCK);
import_lock_thread = me;
import_lock_level--;
} else {
import_lock_thread = PYTHREAD_INVALID_THREAD_ID;
import_lock_level = 0;
}
}
/*[clinic input]
_imp.lock_held
Return True if the import lock is currently held, else False.
On platforms without threads, return False.
[clinic start generated code]*/
static PyObject *
_imp_lock_held_impl(PyObject *module)
/*[clinic end generated code: output=8b89384b5e1963fc input=9b088f9b217d9bdf]*/
{
return PyBool_FromLong(import_lock_thread != PYTHREAD_INVALID_THREAD_ID);
}
/*[clinic input]
_imp.acquire_lock
Acquires the interpreter's import lock for the current thread.
This lock should be used by import hooks to ensure thread-safety when importing
modules. On platforms without threads, this function does nothing.
[clinic start generated code]*/
static PyObject *
_imp_acquire_lock_impl(PyObject *module)
/*[clinic end generated code: output=1aff58cb0ee1b026 input=4a2d4381866d5fdc]*/
{
_PyImport_AcquireLock();
Py_RETURN_NONE;
}
/*[clinic input]
_imp.release_lock
Release the interpreter's import lock.
On platforms without threads, this function does nothing.
[clinic start generated code]*/
static PyObject *
_imp_release_lock_impl(PyObject *module)
/*[clinic end generated code: output=7faab6d0be178b0a input=934fb11516dd778b]*/
{
if (_PyImport_ReleaseLock() < 0) {
PyErr_SetString(PyExc_RuntimeError,
"not holding the import lock");
return NULL;
}
Py_RETURN_NONE;
}
void
_PyImport_Fini(void)
{
Py_CLEAR(extensions);
if (import_lock != NULL) {
PyThread_free_lock(import_lock);
import_lock = NULL;
}
}
/* Helper for sys */
PyObject *
PyImport_GetModuleDict(void)
{
PyInterpreterState *interp = PyThreadState_GET()->interp;
if (interp->modules == NULL) {
Py_FatalError("PyImport_GetModuleDict: no module dictionary!");
}
return interp->modules;
}
/* In some corner cases it is important to be sure that the import
machinery has been initialized (or not cleaned up yet). For
example, see issue #4236 and PyModule_Create2(). */
int
_PyImport_IsInitialized(PyInterpreterState *interp)
{
if (interp->modules == NULL)
return 0;
return 1;
}
PyObject *
_PyImport_GetModuleId(struct _Py_Identifier *nameid)
{
PyObject *name = _PyUnicode_FromId(nameid); /* borrowed */
if (name == NULL) {
return NULL;
}
return PyImport_GetModule(name);
}
int
_PyImport_SetModule(PyObject *name, PyObject *m)
{
PyObject *modules = PyImport_GetModuleDict();
return PyObject_SetItem(modules, name, m);
}
int
_PyImport_SetModuleString(const char *name, PyObject *m)
{
PyObject *modules = PyImport_GetModuleDict();
return PyMapping_SetItemString(modules, name, m);
}
PyObject *
PyImport_GetModule(PyObject *name)
{
PyObject *m;
PyObject *modules = PyImport_GetModuleDict();
if (modules == NULL) {
PyErr_SetString(PyExc_RuntimeError, "unable to get sys.modules");
return NULL;
}
Py_INCREF(modules);
if (PyDict_CheckExact(modules)) {
m = PyDict_GetItemWithError(modules, name); /* borrowed */
Py_XINCREF(m);
}
else {
m = PyObject_GetItem(modules, name);
if (PyErr_ExceptionMatches(PyExc_KeyError)) {
PyErr_Clear();
}
}
Py_DECREF(modules);
return m;
}
/* List of names to clear in sys */
static const char * const sys_deletes[] = {
"path", "argv", "ps1", "ps2",
"last_type", "last_value", "last_traceback",
"path_hooks", "path_importer_cache", "meta_path",
"__interactivehook__",
/* misc stuff */
"flags", "float_info",
NULL
};
static const char * const sys_files[] = {
"stdin", "__stdin__",
"stdout", "__stdout__",
"stderr", "__stderr__",
NULL
};
/* Un-initialize things, as good as we can */
void
PyImport_Cleanup(void)
{
Py_ssize_t pos;
PyObject *key, *value, *dict;
PyInterpreterState *interp = PyThreadState_GET()->interp;
PyObject *modules = PyImport_GetModuleDict();
PyObject *weaklist = NULL;
const char * const *p;
if (modules == NULL)
return; /* Already done */
/* Delete some special variables first. These are common
places where user values hide and people complain when their
destructors fail. Since the modules containing them are
deleted *last* of all, they would come too late in the normal
destruction order. Sigh. */
/* XXX Perhaps these precautions are obsolete. Who knows? */
if (Py_VerboseFlag)
PySys_WriteStderr("# clear builtins._\n");
PyDict_SetItemString(interp->builtins, "_", Py_None);
for (p = sys_deletes; *p != NULL; p++) {
if (Py_VerboseFlag)
PySys_WriteStderr("# clear sys.%s\n", *p);
PyDict_SetItemString(interp->sysdict, *p, Py_None);
}
for (p = sys_files; *p != NULL; p+=2) {
if (Py_VerboseFlag)
PySys_WriteStderr("# restore sys.%s\n", *p);
value = PyDict_GetItemString(interp->sysdict, *(p+1));
if (value == NULL)
value = Py_None;
PyDict_SetItemString(interp->sysdict, *p, value);
}
/* We prepare a list which will receive (name, weakref) tuples of
modules when they are removed from sys.modules. The name is used
for diagnosis messages (in verbose mode), while the weakref helps
detect those modules which have been held alive. */
weaklist = PyList_New(0);
if (weaklist == NULL)
PyErr_Clear();
#define STORE_MODULE_WEAKREF(name, mod) \
if (weaklist != NULL) { \
PyObject *wr = PyWeakref_NewRef(mod, NULL); \
if (name && wr) { \
PyObject *tup = PyTuple_Pack(2, name, wr); \
PyList_Append(weaklist, tup); \
Py_XDECREF(tup); \
} \
Py_XDECREF(wr); \
if (PyErr_Occurred()) \
PyErr_Clear(); \
}
#define CLEAR_MODULE(name, mod) \
if (PyModule_Check(mod)) { \
if (Py_VerboseFlag && PyUnicode_Check(name)) \
PySys_FormatStderr("# cleanup[2] removing %U\n", name); \
STORE_MODULE_WEAKREF(name, mod); \
PyObject_SetItem(modules, name, Py_None); \
}
/* Remove all modules from sys.modules, hoping that garbage collection
can reclaim most of them. */
if (PyDict_CheckExact(modules)) {
pos = 0;
while (PyDict_Next(modules, &pos, &key, &value)) {
CLEAR_MODULE(key, value);
}
}
else {
PyObject *iterator = PyObject_GetIter(modules);
if (iterator == NULL) {
PyErr_Clear();
}
else {
while ((key = PyIter_Next(iterator))) {
value = PyObject_GetItem(modules, key);
if (value == NULL) {
PyErr_Clear();
continue;
}
CLEAR_MODULE(key, value);
Py_DECREF(value);
Py_DECREF(key);
}
Py_DECREF(iterator);
}
}
/* Clear the modules dict. */
if (PyDict_CheckExact(modules)) {
PyDict_Clear(modules);
}
else {
_Py_IDENTIFIER(clear);
if (_PyObject_CallMethodId(modules, &PyId_clear, "") == NULL)
PyErr_Clear();
}
/* Restore the original builtins dict, to ensure that any
user data gets cleared. */
dict = PyDict_Copy(interp->builtins);
if (dict == NULL)
PyErr_Clear();
PyDict_Clear(interp->builtins);
if (PyDict_Update(interp->builtins, interp->builtins_copy))
PyErr_Clear();
Py_XDECREF(dict);
/* Clear module dict copies stored in the interpreter state */
_PyState_ClearModules();
/* Collect references */
_PyGC_CollectNoFail();
/* Dump GC stats before it's too late, since it uses the warnings
machinery. */
_PyGC_DumpShutdownStats();
/* Now, if there are any modules left alive, clear their globals to
minimize potential leaks. All C extension modules actually end
up here, since they are kept alive in the interpreter state.
The special treatment of "builtins" here is because even
when it's not referenced as a module, its dictionary is
referenced by almost every module's __builtins__. Since
deleting a module clears its dictionary (even if there are
references left to it), we need to delete the "builtins"
module last. Likewise, we don't delete sys until the very
end because it is implicitly referenced (e.g. by print). */
if (weaklist != NULL) {
Py_ssize_t i, n;
n = PyList_GET_SIZE(weaklist);
for (i = 0; i < n; i++) {
PyObject *tup = PyList_GET_ITEM(weaklist, i);
PyObject *name = PyTuple_GET_ITEM(tup, 0);
PyObject *mod = PyWeakref_GET_OBJECT(PyTuple_GET_ITEM(tup, 1));
if (mod == Py_None)
continue;
assert(PyModule_Check(mod));
dict = PyModule_GetDict(mod);
if (dict == interp->builtins || dict == interp->sysdict)
continue;
Py_INCREF(mod);
if (Py_VerboseFlag && PyUnicode_Check(name))
PySys_FormatStderr("# cleanup[3] wiping %U\n", name);
_PyModule_Clear(mod);
Py_DECREF(mod);
}
Py_DECREF(weaklist);
}
/* Next, delete sys and builtins (in that order) */
if (Py_VerboseFlag)
PySys_FormatStderr("# cleanup[3] wiping sys\n");
_PyModule_ClearDict(interp->sysdict);
if (Py_VerboseFlag)
PySys_FormatStderr("# cleanup[3] wiping builtins\n");
_PyModule_ClearDict(interp->builtins);
/* Clear and delete the modules directory. Actual modules will
still be there only if imported during the execution of some
destructor. */
interp->modules = NULL;
Py_DECREF(modules);
/* Once more */
_PyGC_CollectNoFail();
#undef STORE_MODULE_WEAKREF
}
/* Helper for pythonrun.c -- return magic number and tag. */
long
PyImport_GetMagicNumber(void)
{
long res;
PyInterpreterState *interp = PyThreadState_Get()->interp;
PyObject *external, *pyc_magic;
external = PyObject_GetAttrString(interp->importlib, "_bootstrap_external");
if (external == NULL)
return -1;
pyc_magic = PyObject_GetAttrString(external, "_RAW_MAGIC_NUMBER");
Py_DECREF(external);
if (pyc_magic == NULL)
return -1;
res = PyLong_AsLong(pyc_magic);
Py_DECREF(pyc_magic);
return res;
}
extern const char * _PySys_ImplCacheTag;
const char *
PyImport_GetMagicTag(void)
{
return _PySys_ImplCacheTag;
}
/* Magic for extension modules (built-in as well as dynamically
loaded). To prevent initializing an extension module more than
once, we keep a static dictionary 'extensions' keyed by the tuple
(module name, module name) (for built-in modules) or by
(filename, module name) (for dynamically loaded modules), containing these
modules. A copy of the module's dictionary is stored by calling
_PyImport_FixupExtensionObject() immediately after the module initialization
function succeeds. A copy can be retrieved from there by calling
_PyImport_FindExtensionObject().
Modules which do support multiple initialization set their m_size
field to a non-negative number (indicating the size of the
module-specific state). They are still recorded in the extensions
dictionary, to avoid loading shared libraries twice.
*/
int
_PyImport_FixupExtensionObject(PyObject *mod, PyObject *name,
PyObject *filename, PyObject *modules)
{
PyObject *dict, *key;
struct PyModuleDef *def;
int res;
if (extensions == NULL) {
extensions = PyDict_New();
if (extensions == NULL)
return -1;
}
if (mod == NULL || !PyModule_Check(mod)) {
PyErr_BadInternalCall();
return -1;
}
def = PyModule_GetDef(mod);
if (!def) {
PyErr_BadInternalCall();
return -1;
}
if (PyObject_SetItem(modules, name, mod) < 0)
return -1;
if (_PyState_AddModule(mod, def) < 0) {
PyMapping_DelItem(modules, name);
return -1;
}
if (def->m_size == -1) {
if (def->m_base.m_copy) {
/* Somebody already imported the module,
likely under a different name.
XXX this should really not happen. */
Py_CLEAR(def->m_base.m_copy);
}
dict = PyModule_GetDict(mod);
if (dict == NULL)
return -1;
def->m_base.m_copy = PyDict_Copy(dict);
if (def->m_base.m_copy == NULL)
return -1;
}
key = PyTuple_Pack(2, filename, name);
if (key == NULL)
return -1;
res = PyDict_SetItem(extensions, key, (PyObject *)def);
Py_DECREF(key);
if (res < 0)
return -1;
return 0;
}
int
_PyImport_FixupBuiltin(PyObject *mod, const char *name, PyObject *modules)
{
int res;
PyObject *nameobj;
nameobj = PyUnicode_InternFromString(name);
if (nameobj == NULL)
return -1;
res = _PyImport_FixupExtensionObject(mod, nameobj, nameobj, modules);
Py_DECREF(nameobj);
return res;
}
PyObject *
_PyImport_FindExtensionObject(PyObject *name, PyObject *filename)
{
PyObject *modules = PyImport_GetModuleDict();
return _PyImport_FindExtensionObjectEx(name, filename, modules);
}
PyObject *
_PyImport_FindExtensionObjectEx(PyObject *name, PyObject *filename,
PyObject *modules)
{
PyObject *mod, *mdict, *key;
PyModuleDef* def;
if (extensions == NULL)
return NULL;
key = PyTuple_Pack(2, filename, name);
if (key == NULL)
return NULL;
def = (PyModuleDef *)PyDict_GetItem(extensions, key);
Py_DECREF(key);
if (def == NULL)
return NULL;
if (def->m_size == -1) {
/* Module does not support repeated initialization */
if (def->m_base.m_copy == NULL)
return NULL;
mod = _PyImport_AddModuleObject(name, modules);
if (mod == NULL)
return NULL;
mdict = PyModule_GetDict(mod);
if (mdict == NULL)
return NULL;
if (PyDict_Update(mdict, def->m_base.m_copy))
return NULL;
}
else {
if (def->m_base.m_init == NULL)
return NULL;
mod = def->m_base.m_init();
if (mod == NULL)
return NULL;
if (PyObject_SetItem(modules, name, mod) == -1) {
Py_DECREF(mod);
return NULL;
}
Py_DECREF(mod);
}
if (_PyState_AddModule(mod, def) < 0) {
PyMapping_DelItem(modules, name);
Py_DECREF(mod);
return NULL;
}
if (Py_VerboseFlag)
PySys_FormatStderr("import %U # previously loaded (%R)\n",
name, filename);
return mod;
}
PyObject *
_PyImport_FindBuiltin(const char *name, PyObject *modules)
{
PyObject *res, *nameobj;
nameobj = PyUnicode_InternFromString(name);
if (nameobj == NULL)
return NULL;
res = _PyImport_FindExtensionObjectEx(nameobj, nameobj, modules);
Py_DECREF(nameobj);
return res;
}
/* Get the module object corresponding to a module name.
First check the modules dictionary if there's one there,
if not, create a new one and insert it in the modules dictionary.
Because the former action is most common, THIS DOES NOT RETURN A
'NEW' REFERENCE! */
PyObject *
PyImport_AddModuleObject(PyObject *name)
{
PyObject *modules = PyImport_GetModuleDict();
return _PyImport_AddModuleObject(name, modules);
}
PyObject *
_PyImport_AddModuleObject(PyObject *name, PyObject *modules)
{
PyObject *m;
if (PyDict_CheckExact(modules)) {
m = PyDict_GetItemWithError(modules, name);
}
else {
m = PyObject_GetItem(modules, name);
// For backward-comaptibility we copy the behavior
// of PyDict_GetItemWithError().
if (PyErr_ExceptionMatches(PyExc_KeyError)) {
PyErr_Clear();
}
}
if (PyErr_Occurred()) {
return NULL;
}
if (m != NULL && PyModule_Check(m)) {
return m;
}
m = PyModule_NewObject(name);
if (m == NULL)
return NULL;
if (PyObject_SetItem(modules, name, m) != 0) {
Py_DECREF(m);
return NULL;
}
Py_DECREF(m); /* Yes, it still exists, in modules! */
return m;
}
PyObject *
PyImport_AddModule(const char *name)
{
PyObject *nameobj, *module;
nameobj = PyUnicode_FromString(name);
if (nameobj == NULL)
return NULL;
module = PyImport_AddModuleObject(nameobj);
Py_DECREF(nameobj);
return module;
}
/* Remove name from sys.modules, if it's there. */
static void
remove_module(PyObject *name)
{
PyObject *modules = PyImport_GetModuleDict();
if (PyMapping_DelItem(modules, name) < 0) {
if (!PyMapping_HasKey(modules, name)) {
return;
}
Py_FatalError("import: deleting existing key in"
"sys.modules failed");
}
}
/* Execute a code object in a module and return the module object
* WITH INCREMENTED REFERENCE COUNT. If an error occurs, name is
* removed from sys.modules, to avoid leaving damaged module objects
* in sys.modules. The caller may wish to restore the original
* module object (if any) in this case; PyImport_ReloadModule is an
* example.
*
* Note that PyImport_ExecCodeModuleWithPathnames() is the preferred, richer
* interface. The other two exist primarily for backward compatibility.
*/
PyObject *
PyImport_ExecCodeModule(const char *name, PyObject *co)
{
return PyImport_ExecCodeModuleWithPathnames(
name, co, (char *)NULL, (char *)NULL);
}
PyObject *
PyImport_ExecCodeModuleEx(const char *name, PyObject *co, const char *pathname)
{
return PyImport_ExecCodeModuleWithPathnames(
name, co, pathname, (char *)NULL);
}
PyObject *
PyImport_ExecCodeModuleWithPathnames(const char *name, PyObject *co,
const char *pathname,
const char *cpathname)
{
PyObject *m = NULL;
PyObject *nameobj, *pathobj = NULL, *cpathobj = NULL, *external= NULL;
nameobj = PyUnicode_FromString(name);
if (nameobj == NULL)
return NULL;
if (cpathname != NULL) {
cpathobj = PyUnicode_DecodeFSDefault(cpathname);
if (cpathobj == NULL)
goto error;
}
else
cpathobj = NULL;
if (pathname != NULL) {
pathobj = PyUnicode_DecodeFSDefault(pathname);
if (pathobj == NULL)
goto error;
}
else if (cpathobj != NULL) {
PyInterpreterState *interp = PyThreadState_GET()->interp;
_Py_IDENTIFIER(_get_sourcefile);
if (interp == NULL) {
Py_FatalError("PyImport_ExecCodeModuleWithPathnames: "
"no interpreter!");
}
external= PyObject_GetAttrString(interp->importlib,
"_bootstrap_external");
if (external != NULL) {
pathobj = _PyObject_CallMethodIdObjArgs(external,
&PyId__get_sourcefile, cpathobj,
NULL);
Py_DECREF(external);
}
if (pathobj == NULL)
PyErr_Clear();
}
else
pathobj = NULL;
m = PyImport_ExecCodeModuleObject(nameobj, co, pathobj, cpathobj);
error:
Py_DECREF(nameobj);
Py_XDECREF(pathobj);
Py_XDECREF(cpathobj);
return m;
}
static PyObject *
module_dict_for_exec(PyObject *name)
{
PyObject *m, *d = NULL;
m = PyImport_AddModuleObject(name);
if (m == NULL)
return NULL;
/* If the module is being reloaded, we get the old module back
and re-use its dict to exec the new code. */
d = PyModule_GetDict(m);
if (PyDict_GetItemString(d, "__builtins__") == NULL) {
if (PyDict_SetItemString(d, "__builtins__",
PyEval_GetBuiltins()) != 0) {
remove_module(name);
return NULL;
}
}
return d; /* Return a borrowed reference. */
}
static PyObject *
exec_code_in_module(PyObject *name, PyObject *module_dict, PyObject *code_object)
{
PyObject *v, *m;
v = PyEval_EvalCode(code_object, module_dict, module_dict);
if (v == NULL) {
remove_module(name);
return NULL;
}
Py_DECREF(v);
m = PyImport_GetModule(name);
if (m == NULL) {
PyErr_Format(PyExc_ImportError,
"Loaded module %R not found in sys.modules",
name);
return NULL;
}
return m;
}
PyObject*
PyImport_ExecCodeModuleObject(PyObject *name, PyObject *co, PyObject *pathname,
PyObject *cpathname)
{
PyObject *d, *external, *res;
PyInterpreterState *interp = PyThreadState_GET()->interp;
_Py_IDENTIFIER(_fix_up_module);
d = module_dict_for_exec(name);
if (d == NULL) {
return NULL;
}
if (pathname == NULL) {
pathname = ((PyCodeObject *)co)->co_filename;
}
external = PyObject_GetAttrString(interp->importlib, "_bootstrap_external");
if (external == NULL)
return NULL;
res = _PyObject_CallMethodIdObjArgs(external,
&PyId__fix_up_module,
d, name, pathname, cpathname, NULL);
Py_DECREF(external);
if (res != NULL) {
Py_DECREF(res);
res = exec_code_in_module(name, d, co);
}
return res;
}
static void
update_code_filenames(PyCodeObject *co, PyObject *oldname, PyObject *newname)
{
PyObject *constants, *tmp;
Py_ssize_t i, n;
if (PyUnicode_Compare(co->co_filename, oldname))
return;
Py_INCREF(newname);
Py_XSETREF(co->co_filename, newname);
constants = co->co_consts;
n = PyTuple_GET_SIZE(constants);
for (i = 0; i < n; i++) {
tmp = PyTuple_GET_ITEM(constants, i);
if (PyCode_Check(tmp))
update_code_filenames((PyCodeObject *)tmp,
oldname, newname);
}
}
static void
update_compiled_module(PyCodeObject *co, PyObject *newname)
{
PyObject *oldname;
if (PyUnicode_Compare(co->co_filename, newname) == 0)
return;
oldname = co->co_filename;
Py_INCREF(oldname);
update_code_filenames(co, oldname, newname);