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2681 lines (2329 loc) · 72.7 KB
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/* Module definition and import implementation */
#include "Python.h"
#include "pycore_import.h" // _PyImport_BootstrapImp()
#include "pycore_initconfig.h" // _PyStatus_OK()
#include "pycore_interp.h" // _PyInterpreterState_ClearModules()
#include "pycore_namespace.h" // _PyNamespace_Type
#include "pycore_pyerrors.h" // _PyErr_SetString()
#include "pycore_pyhash.h" // _Py_KeyedHash()
#include "pycore_pylifecycle.h"
#include "pycore_pymem.h" // _PyMem_SetDefaultAllocator()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_sysmodule.h" // _PySys_Audit()
#include "marshal.h" // PyMarshal_ReadObjectFromString()
#include "importdl.h" // _PyImport_DynLoadFiletab
#include "pydtrace.h" // PyDTrace_IMPORT_FIND_LOAD_START_ENABLED()
#include <stdbool.h> // bool
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* Forward references */
static PyObject *import_add_module(PyThreadState *tstate, PyObject *name);
/* 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 struct _inittab *inittab_copy = NULL;
/*[clinic input]
module _imp
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=9c332475d8686284]*/
#include "clinic/import.c.h"
/* Initialize things */
PyStatus
_PyImportZip_Init(PyThreadState *tstate)
{
PyObject *path_hooks, *zipimport;
int err = 0;
path_hooks = PySys_GetObject("path_hooks");
if (path_hooks == NULL) {
_PyErr_SetString(tstate, PyExc_RuntimeError,
"unable to get sys.path_hooks");
goto error;
}
int verbose = _PyInterpreterState_GetConfig(tstate->interp)->verbose;
if (verbose) {
PySys_WriteStderr("# installing zipimport hook\n");
}
zipimport = PyImport_ImportModule("zipimport");
if (zipimport == NULL) {
_PyErr_Clear(tstate); /* No zip import module -- okay */
if (verbose) {
PySys_WriteStderr("# can't import zipimport\n");
}
}
else {
PyObject *zipimporter = PyObject_GetAttr(zipimport, &_Py_ID(zipimporter));
Py_DECREF(zipimport);
if (zipimporter == NULL) {
_PyErr_Clear(tstate); /* No zipimporter object -- okay */
if (verbose) {
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 (verbose) {
PySys_WriteStderr("# installed zipimport hook\n");
}
}
}
return _PyStatus_OK();
error:
PyErr_Print();
return _PyStatus_ERR("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. */
static PyThread_type_lock import_lock = NULL;
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, WAIT_LOCK);
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;
}
#ifdef HAVE_FORK
/* 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. */
PyStatus
_PyImport_ReInitLock(void)
{
if (import_lock != NULL) {
if (_PyThread_at_fork_reinit(&import_lock) < 0) {
return _PyStatus_ERR("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();
PyThread_acquire_lock(import_lock, WAIT_LOCK);
import_lock_thread = me;
import_lock_level--;
} else {
import_lock_thread = PYTHREAD_INVALID_THREAD_ID;
import_lock_level = 0;
}
return _PyStatus_OK();
}
#endif
/*[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;
}
}
void
_PyImport_Fini2(void)
{
/* Use the same memory allocator than PyImport_ExtendInittab(). */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
// Reset PyImport_Inittab
PyImport_Inittab = _PyImport_Inittab;
/* Free memory allocated by PyImport_ExtendInittab() */
PyMem_RawFree(inittab_copy);
inittab_copy = NULL;
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
}
/* Helper for sys */
PyObject *
PyImport_GetModuleDict(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp->modules == NULL) {
Py_FatalError("interpreter has no modules 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(_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)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
PyObject *modules = interp->modules;
return PyObject_SetItem(modules, name, m);
}
int
_PyImport_SetModuleString(const char *name, PyObject *m)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
PyObject *modules = interp->modules;
return PyMapping_SetItemString(modules, name, m);
}
static PyObject *
import_get_module(PyThreadState *tstate, PyObject *name)
{
PyObject *modules = tstate->interp->modules;
if (modules == NULL) {
_PyErr_SetString(tstate, PyExc_RuntimeError,
"unable to get sys.modules");
return NULL;
}
PyObject *m;
Py_INCREF(modules);
if (PyDict_CheckExact(modules)) {
m = PyDict_GetItemWithError(modules, name); /* borrowed */
Py_XINCREF(m);
}
else {
m = PyObject_GetItem(modules, name);
if (m == NULL && _PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
_PyErr_Clear(tstate);
}
}
Py_DECREF(modules);
return m;
}
static int
import_ensure_initialized(PyInterpreterState *interp, PyObject *mod, PyObject *name)
{
PyObject *spec;
/* Optimization: only call _bootstrap._lock_unlock_module() if
__spec__._initializing is true.
NOTE: because of this, initializing must be set *before*
stuffing the new module in sys.modules.
*/
spec = PyObject_GetAttr(mod, &_Py_ID(__spec__));
int busy = _PyModuleSpec_IsInitializing(spec);
Py_XDECREF(spec);
if (busy) {
/* Wait until module is done importing. */
PyObject *value = _PyObject_CallMethodOneArg(
interp->importlib, &_Py_ID(_lock_unlock_module), name);
if (value == NULL) {
return -1;
}
Py_DECREF(value);
}
return 0;
}
/* Helper for pythonrun.c -- return magic number and tag. */
long
PyImport_GetMagicNumber(void)
{
long res;
PyInterpreterState *interp = _PyInterpreterState_GET();
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
import_find_extension().
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)
{
if (mod == NULL || !PyModule_Check(mod)) {
PyErr_BadInternalCall();
return -1;
}
struct PyModuleDef *def = PyModule_GetDef(mod);
if (!def) {
PyErr_BadInternalCall();
return -1;
}
PyThreadState *tstate = _PyThreadState_GET();
if (PyObject_SetItem(modules, name, mod) < 0) {
return -1;
}
if (_PyState_AddModule(tstate, mod, def) < 0) {
PyMapping_DelItem(modules, name);
return -1;
}
// bpo-44050: Extensions and def->m_base.m_copy can be updated
// when the extension module doesn't support sub-interpreters.
if (_Py_IsMainInterpreter(tstate->interp) || def->m_size == -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);
}
PyObject *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;
}
}
if (extensions == NULL) {
extensions = PyDict_New();
if (extensions == NULL) {
return -1;
}
}
PyObject *key = PyTuple_Pack(2, filename, name);
if (key == NULL) {
return -1;
}
int 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;
}
static PyObject *
import_find_extension(PyThreadState *tstate, PyObject *name,
PyObject *filename)
{
if (extensions == NULL) {
return NULL;
}
PyObject *key = PyTuple_Pack(2, filename, name);
if (key == NULL) {
return NULL;
}
PyModuleDef* def = (PyModuleDef *)PyDict_GetItemWithError(extensions, key);
Py_DECREF(key);
if (def == NULL) {
return NULL;
}
PyObject *mod, *mdict;
PyObject *modules = tstate->interp->modules;
if (def->m_size == -1) {
/* Module does not support repeated initialization */
if (def->m_base.m_copy == NULL)
return NULL;
mod = import_add_module(tstate, name);
if (mod == NULL)
return NULL;
mdict = PyModule_GetDict(mod);
if (mdict == NULL) {
Py_DECREF(mod);
return NULL;
}
if (PyDict_Update(mdict, def->m_base.m_copy)) {
Py_DECREF(mod);
return NULL;
}
}
else {
if (def->m_base.m_init == NULL)
return NULL;
mod = _PyImport_InitFunc_TrampolineCall(def->m_base.m_init);
if (mod == NULL)
return NULL;
if (PyObject_SetItem(modules, name, mod) == -1) {
Py_DECREF(mod);
return NULL;
}
}
if (_PyState_AddModule(tstate, mod, def) < 0) {
PyMapping_DelItem(modules, name);
Py_DECREF(mod);
return NULL;
}
int verbose = _PyInterpreterState_GetConfig(tstate->interp)->verbose;
if (verbose) {
PySys_FormatStderr("import %U # previously loaded (%R)\n",
name, filename);
}
return mod;
}
/* 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. */
static PyObject *
import_add_module(PyThreadState *tstate, PyObject *name)
{
PyObject *modules = tstate->interp->modules;
if (modules == NULL) {
_PyErr_SetString(tstate, PyExc_RuntimeError,
"no import module dictionary");
return NULL;
}
PyObject *m;
if (PyDict_CheckExact(modules)) {
m = PyDict_GetItemWithError(modules, name);
Py_XINCREF(m);
}
else {
m = PyObject_GetItem(modules, name);
// For backward-compatibility we copy the behavior
// of PyDict_GetItemWithError().
if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
_PyErr_Clear(tstate);
}
}
if (_PyErr_Occurred(tstate)) {
return NULL;
}
if (m != NULL && PyModule_Check(m)) {
return m;
}
Py_XDECREF(m);
m = PyModule_NewObject(name);
if (m == NULL)
return NULL;
if (PyObject_SetItem(modules, name, m) != 0) {
Py_DECREF(m);
return NULL;
}
return m;
}
PyObject *
PyImport_AddModuleObject(PyObject *name)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *mod = import_add_module(tstate, name);
if (mod) {
PyObject *ref = PyWeakref_NewRef(mod, NULL);
Py_DECREF(mod);
if (ref == NULL) {
return NULL;
}
mod = PyWeakref_GetObject(ref);
Py_DECREF(ref);
}
return mod; /* borrowed reference */
}
PyObject *
PyImport_AddModule(const char *name)
{
PyObject *nameobj = PyUnicode_FromString(name);
if (nameobj == NULL) {
return NULL;
}
PyObject *module = PyImport_AddModuleObject(nameobj);
Py_DECREF(nameobj);
return module;
}
/* Remove name from sys.modules, if it's there.
* Can be called with an exception raised.
* If fail to remove name a new exception will be chained with the old
* exception, otherwise the old exception is preserved.
*/
static void
remove_module(PyThreadState *tstate, PyObject *name)
{
PyObject *type, *value, *traceback;
_PyErr_Fetch(tstate, &type, &value, &traceback);
PyObject *modules = tstate->interp->modules;
if (PyDict_CheckExact(modules)) {
PyObject *mod = _PyDict_Pop(modules, name, Py_None);
Py_XDECREF(mod);
}
else if (PyMapping_DelItem(modules, name) < 0) {
if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
_PyErr_Clear(tstate);
}
}
_PyErr_ChainExceptions(type, value, traceback);
}
/* 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 = _PyInterpreterState_GET();
if (interp == NULL) {
Py_FatalError("no current interpreter");
}
external= PyObject_GetAttrString(interp->importlib,
"_bootstrap_external");
if (external != NULL) {
pathobj = _PyObject_CallMethodOneArg(
external, &_Py_ID(_get_sourcefile), cpathobj);
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(PyThreadState *tstate, PyObject *name)
{
PyObject *m, *d;
m = import_add_module(tstate, 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);
int r = PyDict_Contains(d, &_Py_ID(__builtins__));
if (r == 0) {
r = PyDict_SetItem(d, &_Py_ID(__builtins__), PyEval_GetBuiltins());
}
if (r < 0) {
remove_module(tstate, name);
Py_DECREF(m);
return NULL;
}
Py_INCREF(d);
Py_DECREF(m);
return d;
}
static PyObject *
exec_code_in_module(PyThreadState *tstate, 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(tstate, name);
return NULL;
}
Py_DECREF(v);
m = import_get_module(tstate, name);
if (m == NULL && !_PyErr_Occurred(tstate)) {
_PyErr_Format(tstate, PyExc_ImportError,
"Loaded module %R not found in sys.modules",
name);
}
return m;
}
PyObject*
PyImport_ExecCodeModuleObject(PyObject *name, PyObject *co, PyObject *pathname,
PyObject *cpathname)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *d, *external, *res;
d = module_dict_for_exec(tstate, name);
if (d == NULL) {
return NULL;
}
if (pathname == NULL) {
pathname = ((PyCodeObject *)co)->co_filename;
}
external = PyObject_GetAttrString(tstate->interp->importlib,
"_bootstrap_external");
if (external == NULL) {
Py_DECREF(d);
return NULL;
}
res = PyObject_CallMethodObjArgs(external, &_Py_ID(_fix_up_module),
d, name, pathname, cpathname, NULL);
Py_DECREF(external);
if (res != NULL) {
Py_DECREF(res);
res = exec_code_in_module(tstate, name, d, co);
}
Py_DECREF(d);
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);
Py_DECREF(oldname);
}
/*[clinic input]
_imp._fix_co_filename
code: object(type="PyCodeObject *", subclass_of="&PyCode_Type")
Code object to change.
path: unicode
File path to use.
/
Changes code.co_filename to specify the passed-in file path.
[clinic start generated code]*/
static PyObject *
_imp__fix_co_filename_impl(PyObject *module, PyCodeObject *code,
PyObject *path)
/*[clinic end generated code: output=1d002f100235587d input=895ba50e78b82f05]*/
{
update_compiled_module(code, path);
Py_RETURN_NONE;
}
/* Helper to test for built-in module */
static int
is_builtin(PyObject *name)
{
int i;
for (i = 0; PyImport_Inittab[i].name != NULL; i++) {
if (_PyUnicode_EqualToASCIIString(name, PyImport_Inittab[i].name)) {
if (PyImport_Inittab[i].initfunc == NULL)
return -1;
else
return 1;
}
}
return 0;
}
/* Return a finder object for a sys.path/pkg.__path__ item 'p',
possibly by fetching it from the path_importer_cache dict. If it
wasn't yet cached, traverse path_hooks until a hook is found
that can handle the path item. Return None if no hook could;
this tells our caller that the path based finder could not find
a finder for this path item. Cache the result in
path_importer_cache. */
static PyObject *
get_path_importer(PyThreadState *tstate, PyObject *path_importer_cache,
PyObject *path_hooks, PyObject *p)
{
PyObject *importer;
Py_ssize_t j, nhooks;
/* These conditions are the caller's responsibility: */
assert(PyList_Check(path_hooks));
assert(PyDict_Check(path_importer_cache));
nhooks = PyList_Size(path_hooks);
if (nhooks < 0)
return NULL; /* Shouldn't happen */
importer = PyDict_GetItemWithError(path_importer_cache, p);
if (importer != NULL || _PyErr_Occurred(tstate)) {
Py_XINCREF(importer);
return importer;
}
/* set path_importer_cache[p] to None to avoid recursion */
if (PyDict_SetItem(path_importer_cache, p, Py_None) != 0)
return NULL;
for (j = 0; j < nhooks; j++) {
PyObject *hook = PyList_GetItem(path_hooks, j);
if (hook == NULL)
return NULL;
importer = PyObject_CallOneArg(hook, p);
if (importer != NULL)
break;
if (!_PyErr_ExceptionMatches(tstate, PyExc_ImportError)) {
return NULL;
}
_PyErr_Clear(tstate);
}
if (importer == NULL) {
Py_RETURN_NONE;
}
if (PyDict_SetItem(path_importer_cache, p, importer) < 0) {
Py_DECREF(importer);
return NULL;
}
return importer;
}
PyObject *
PyImport_GetImporter(PyObject *path)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *path_importer_cache = PySys_GetObject("path_importer_cache");
if (path_importer_cache == NULL) {
PyErr_SetString(PyExc_RuntimeError, "lost sys.path_importer_cache");
return NULL;
}
Py_INCREF(path_importer_cache);
PyObject *path_hooks = PySys_GetObject("path_hooks");
if (path_hooks == NULL) {
PyErr_SetString(PyExc_RuntimeError, "lost sys.path_hooks");
Py_DECREF(path_importer_cache);
return NULL;
}
Py_INCREF(path_hooks);
PyObject *importer = get_path_importer(tstate, path_importer_cache, path_hooks, path);
Py_DECREF(path_hooks);
Py_DECREF(path_importer_cache);
return importer;
}
#if defined(__EMSCRIPTEN__) && defined(PY_CALL_TRAMPOLINE)
#include <emscripten.h>
EM_JS(PyObject*, _PyImport_InitFunc_TrampolineCall, (PyModInitFunction func), {
return wasmTable.get(func)();
});
#endif // __EMSCRIPTEN__ && PY_CALL_TRAMPOLINE
static PyObject*
create_builtin(PyThreadState *tstate, PyObject *name, PyObject *spec)
{
PyObject *mod = import_find_extension(tstate, name, name);
if (mod || _PyErr_Occurred(tstate)) {
return mod;
}
PyObject *modules = tstate->interp->modules;
for (struct _inittab *p = PyImport_Inittab; p->name != NULL; p++) {
if (_PyUnicode_EqualToASCIIString(name, p->name)) {
if (p->initfunc == NULL) {
/* Cannot re-init internal module ("sys" or "builtins") */
mod = PyImport_AddModuleObject(name);
return Py_XNewRef(mod);
}
mod = _PyImport_InitFunc_TrampolineCall(*p->initfunc);
if (mod == NULL) {
return NULL;
}
if (PyObject_TypeCheck(mod, &PyModuleDef_Type)) {
You can’t perform that action at this time.