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cpython/Python/import.c
Guido van Rossum 197346fafe New policy for package imports: only a directory containing 
__init__.py (or __init__.pyc/.pyo, whichever applies) is considered a
package.  All other subdirectories are left alone.  Should make Konrad
Hinsen happy!
1997-10-31 18:38:52 +00:00

1926 lines
43 KiB
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/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI or Corporation for National Research Initiatives or
CNRI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.
While CWI is the initial source for this software, a modified version
is made available by the Corporation for National Research Initiatives
(CNRI) at the Internet address ftp://ftp.python.org.
STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
******************************************************************/
/* Module definition and import implementation */
#include "Python.h"
#include "node.h"
#include "token.h"
#include "errcode.h"
#include "marshal.h"
#include "compile.h"
#include "eval.h"
#include "osdefs.h"
#include "importdl.h"
#ifdef macintosh
#include "macglue.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/* We expect that stat exists on most systems.
It's confirmed on Unix, Mac and Windows.
If you don't have it, add #define DONT_HAVE_STAT to your config.h. */
#ifndef DONT_HAVE_STAT
#define HAVE_STAT
#include <sys/types.h>
#include <sys/stat.h>
#ifndef S_ISDIR
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif
#endif
extern long PyOS_GetLastModificationTime(); /* In getmtime.c */
/* Magic word to reject .pyc files generated by other Python versions */
/* Change for each incompatible change */
/* The value of CR and LF is incorporated so if you ever read or write
a .pyc file in text mode the magic number will be wrong; also, the
Apple MPW compiler swaps their values, botching string constants */
/* XXX Perhaps the magic number should be frozen and a version field
added to the .pyc file header? */
/* New way to come up with the magic number: (YEAR-1995), MONTH, DAY */
#define MAGIC (20121 | ((long)'\r'<<16) | ((long)'\n'<<24))
/* See _PyImport_FixupExtension() below */
static PyObject *extensions = NULL;
/* This table is defined in config.c: */
extern struct _inittab _PyImport_Inittab[];
struct _inittab *PyImport_Inittab = _PyImport_Inittab;
/* Initialize things */
void
_PyImport_Init()
{
if (Py_OptimizeFlag) {
/* Replace ".pyc" with ".pyo" in import_filetab */
struct filedescr *p;
for (p = _PyImport_Filetab; p->suffix != NULL; p++) {
if (strcmp(p->suffix, ".pyc") == 0)
p->suffix = ".pyo";
}
}
}
void
_PyImport_Fini()
{
Py_XDECREF(extensions);
extensions = NULL;
}
/* Helper for sys */
PyObject *
PyImport_GetModuleDict()
{
PyInterpreterState *interp = PyThreadState_Get()->interp;
if (interp->modules == NULL)
Py_FatalError("PyImport_GetModuleDict: no module dictionary!");
return interp->modules;
}
/* Helper for PyImport_Cleanup */
static void
clear_carefully(d)
PyObject *d;
{
/* To make the execution order of destructors for global
objects a bit more predictable, we first zap all objects
whose name starts with a single underscore, before we clear
the entire dictionary. We zap them by replacing them with
None, rather than deleting them from the dictionary, to
avoid rehashing the dictionary (to some extent). */
int pos;
PyObject *key, *value;
pos = 0;
while (PyDict_Next(d, &pos, &key, &value)) {
if (value != Py_None && PyString_Check(key)) {
char *s = PyString_AsString(key);
if (s[0] == '_' && s[1] != '_')
PyDict_SetItem(d, key, Py_None);
}
}
PyDict_Clear(d);
}
/* Un-initialize things, as good as we can */
void
PyImport_Cleanup()
{
PyInterpreterState *interp = PyThreadState_Get()->interp;
PyObject *tmp = interp->modules;
if (tmp != NULL) {
int pos;
PyObject *key, *value;
interp->modules = NULL;
pos = 0;
while (PyDict_Next(tmp, &pos, &key, &value)) {
if (PyModule_Check(value)) {
PyObject *d = PyModule_GetDict(value);
clear_carefully(d);
}
}
PyDict_Clear(tmp);
Py_DECREF(tmp);
}
}
/* Helper for pythonrun.c -- return magic number */
long
PyImport_GetMagicNumber()
{
return MAGIC;
}
/* 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 module name
(for built-in modules) or by filename (for dynamically loaded
modules), containing these modules. A copy od the module's
dictionary is stored by calling _PyImport_FixupExtension()
immediately after the module initialization function succeeds. A
copy can be retrieved from there by calling
_PyImport_FindExtension(). */
PyObject *
_PyImport_FixupExtension(name, filename)
char *name;
char *filename;
{
PyObject *modules, *mod, *dict, *copy;
if (extensions == NULL) {
extensions = PyDict_New();
if (extensions == NULL)
return NULL;
}
modules = PyImport_GetModuleDict();
mod = PyDict_GetItemString(modules, name);
if (mod == NULL || !PyModule_Check(mod)) {
PyErr_Format(PyExc_SystemError,
"_PyImport_FixupExtension: module %.200s not loaded", name);
return NULL;
}
dict = PyModule_GetDict(mod);
if (dict == NULL)
return NULL;
copy = PyObject_CallMethod(dict, "copy", "");
if (copy == NULL)
return NULL;
PyDict_SetItemString(extensions, filename, copy);
Py_DECREF(copy);
return copy;
}
PyObject *
_PyImport_FindExtension(name, filename)
char *name;
char *filename;
{
PyObject *dict, *mod, *mdict, *result;
if (extensions == NULL)
return NULL;
dict = PyDict_GetItemString(extensions, filename);
if (dict == NULL)
return NULL;
mod = PyImport_AddModule(name);
if (mod == NULL)
return NULL;
mdict = PyModule_GetDict(mod);
if (mdict == NULL)
return NULL;
result = PyObject_CallMethod(mdict, "update", "O", dict);
if (result == NULL)
return NULL;
Py_DECREF(result);
if (Py_VerboseFlag)
fprintf(stderr, "import %s # previously loaded (%s)\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 in in the modules dictionary.
Because the former action is most common, THIS DOES NOT RETURN A
'NEW' REFERENCE! */
PyObject *
PyImport_AddModule(name)
char *name;
{
PyObject *modules = PyImport_GetModuleDict();
PyObject *m;
if ((m = PyDict_GetItemString(modules, name)) != NULL &&
PyModule_Check(m))
return m;
m = PyModule_New(name);
if (m == NULL)
return NULL;
if (PyDict_SetItemString(modules, name, m) != 0) {
Py_DECREF(m);
return NULL;
}
Py_DECREF(m); /* Yes, it still exists, in modules! */
return m;
}
/* Execute a code object in a module and return the module object
WITH INCREMENTED REFERENCE COUNT */
PyObject *
PyImport_ExecCodeModule(name, co)
char *name;
PyObject *co;
{
PyObject *modules = PyImport_GetModuleDict();
PyObject *m, *d, *v;
m = PyImport_AddModule(name);
if (m == NULL)
return NULL;
d = PyModule_GetDict(m);
if (PyDict_GetItemString(d, "__builtins__") == NULL) {
if (PyDict_SetItemString(d, "__builtins__",
PyEval_GetBuiltins()) != 0)
return NULL;
}
/* Remember the filename as the __file__ attribute */
if (PyDict_SetItemString(d, "__file__",
((PyCodeObject *)co)->co_filename) != 0)
PyErr_Clear(); /* Not important enough to report */
v = PyEval_EvalCode((PyCodeObject *)co, d, d);
if (v == NULL)
return NULL;
Py_DECREF(v);
if ((m = PyDict_GetItemString(modules, name)) == NULL) {
PyErr_Format(PyExc_ImportError,
"Loaded module %.200s not found in sys.modules",
name);
return NULL;
}
Py_INCREF(m);
return m;
}
/* Given a pathname for a Python source file, fill a buffer with the
pathname for the corresponding compiled file. Return the pathname
for the compiled file, or NULL if there's no space in the buffer.
Doesn't set an exception. */
static char *
make_compiled_pathname(pathname, buf, buflen)
char *pathname;
char *buf;
int buflen;
{
int len;
len = strlen(pathname);
if (len+2 > buflen)
return NULL;
strcpy(buf, pathname);
strcpy(buf+len, Py_OptimizeFlag ? "o" : "c");
return buf;
}
/* Given a pathname for a Python source file, its time of last
modification, and a pathname for a compiled file, check whether the
compiled file represents the same version of the source. If so,
return a FILE pointer for the compiled file, positioned just after
the header; if not, return NULL.
Doesn't set an exception. */
static FILE *
check_compiled_module(pathname, mtime, cpathname)
char *pathname;
long mtime;
char *cpathname;
{
FILE *fp;
long magic;
long pyc_mtime;
fp = fopen(cpathname, "rb");
if (fp == NULL)
return NULL;
magic = PyMarshal_ReadLongFromFile(fp);
if (magic != MAGIC) {
if (Py_VerboseFlag)
fprintf(stderr, "# %s has bad magic\n", cpathname);
fclose(fp);
return NULL;
}
pyc_mtime = PyMarshal_ReadLongFromFile(fp);
if (pyc_mtime != mtime) {
if (Py_VerboseFlag)
fprintf(stderr, "# %s has bad mtime\n", cpathname);
fclose(fp);
return NULL;
}
if (Py_VerboseFlag)
fprintf(stderr, "# %s matches %s\n", cpathname, pathname);
return fp;
}
/* Read a code object from a file and check it for validity */
static PyCodeObject *
read_compiled_module(cpathname, fp)
char *cpathname;
FILE *fp;
{
PyObject *co;
co = PyMarshal_ReadObjectFromFile(fp);
/* Ugly: rd_object() may return NULL with or without error */
if (co == NULL || !PyCode_Check(co)) {
if (!PyErr_Occurred())
PyErr_Format(PyExc_ImportError,
"Non-code object in %.200s", cpathname);
Py_XDECREF(co);
return NULL;
}
return (PyCodeObject *)co;
}
/* Load a module from a compiled file, execute it, and return its
module object WITH INCREMENTED REFERENCE COUNT */
static PyObject *
load_compiled_module(name, cpathname, fp)
char *name;
char *cpathname;
FILE *fp;
{
long magic;
PyCodeObject *co;
PyObject *m;
magic = PyMarshal_ReadLongFromFile(fp);
if (magic != MAGIC) {
PyErr_Format(PyExc_ImportError,
"Bad magic number in %.200s", cpathname);
return NULL;
}
(void) PyMarshal_ReadLongFromFile(fp);
co = read_compiled_module(cpathname, fp);
if (co == NULL)
return NULL;
if (Py_VerboseFlag)
fprintf(stderr, "import %s # precompiled from %s\n",
name, cpathname);
m = PyImport_ExecCodeModule(name, (PyObject *)co);
Py_DECREF(co);
return m;
}
/* Parse a source file and return the corresponding code object */
static PyCodeObject *
parse_source_module(pathname, fp)
char *pathname;
FILE *fp;
{
PyCodeObject *co;
node *n;
n = PyParser_SimpleParseFile(fp, pathname, Py_file_input);
if (n == NULL)
return NULL;
co = PyNode_Compile(n, pathname);
PyNode_Free(n);
return co;
}
/* Write a compiled module to a file, placing the time of last
modification of its source into the header.
Errors are ignored, if a write error occurs an attempt is made to
remove the file. */
static void
write_compiled_module(co, cpathname, mtime)
PyCodeObject *co;
char *cpathname;
long mtime;
{
FILE *fp;
fp = fopen(cpathname, "wb");
if (fp == NULL) {
if (Py_VerboseFlag)
fprintf(stderr,
"# can't create %s\n", cpathname);
return;
}
PyMarshal_WriteLongToFile(MAGIC, fp);
/* First write a 0 for mtime */
PyMarshal_WriteLongToFile(0L, fp);
PyMarshal_WriteObjectToFile((PyObject *)co, fp);
if (ferror(fp)) {
if (Py_VerboseFlag)
fprintf(stderr, "# can't write %s\n", cpathname);
/* Don't keep partial file */
fclose(fp);
(void) unlink(cpathname);
return;
}
/* Now write the true mtime */
fseek(fp, 4L, 0);
PyMarshal_WriteLongToFile(mtime, fp);
fflush(fp);
fclose(fp);
if (Py_VerboseFlag)
fprintf(stderr, "# wrote %s\n", cpathname);
#ifdef macintosh
setfiletype(cpathname, 'Pyth', 'PYC ');
#endif
}
/* Load a source module from a given file and return its module
object WITH INCREMENTED REFERENCE COUNT. If there's a matching
byte-compiled file, use that instead. */
static PyObject *
load_source_module(name, pathname, fp)
char *name;
char *pathname;
FILE *fp;
{
long mtime;
FILE *fpc;
char buf[MAXPATHLEN+1];
char *cpathname;
PyCodeObject *co;
PyObject *m;
mtime = PyOS_GetLastModificationTime(pathname, fp);
cpathname = make_compiled_pathname(pathname, buf, MAXPATHLEN+1);
if (cpathname != NULL &&
(fpc = check_compiled_module(pathname, mtime, cpathname))) {
co = read_compiled_module(cpathname, fpc);
fclose(fpc);
if (co == NULL)
return NULL;
if (Py_VerboseFlag)
fprintf(stderr, "import %s # precompiled from %s\n",
name, cpathname);
}
else {
co = parse_source_module(pathname, fp);
if (co == NULL)
return NULL;
if (Py_VerboseFlag)
fprintf(stderr, "import %s # from %s\n",
name, pathname);
write_compiled_module(co, cpathname, mtime);
}
m = PyImport_ExecCodeModule(name, (PyObject *)co);
Py_DECREF(co);
return m;
}
/* Forward */
static PyObject *load_module Py_PROTO((char *, FILE *, char *, int));
static struct filedescr *find_module Py_PROTO((char *, PyObject *,
char *, int, FILE **));
static struct _frozen *find_frozen Py_PROTO((char *name));
/* Load a package and return its module object WITH INCREMENTED
REFERENCE COUNT */
static PyObject *
load_package(name, pathname)
char *name;
char *pathname;
{
PyObject *m, *d, *file, *path;
int err;
char buf[MAXPATHLEN+1];
FILE *fp = NULL;
struct filedescr *fdp;
m = PyImport_AddModule(name);
if (m == NULL)
return NULL;
if (Py_VerboseFlag)
fprintf(stderr, "import %s # directory %s\n",
name, pathname);
d = PyModule_GetDict(m);
file = PyString_FromString(pathname);
if (file == NULL)
return NULL;
path = Py_BuildValue("[O]", file);
if (path == NULL) {
Py_DECREF(file);
return NULL;
}
err = PyDict_SetItemString(d, "__file__", file);
if (err == 0)
err = PyDict_SetItemString(d, "__path__", path);
if (err != 0) {
m = NULL;
goto cleanup;
}
buf[0] = '\0';
fdp = find_module("__init__", path, buf, sizeof(buf), &fp);
if (fdp == NULL) {
if (PyErr_ExceptionMatches(PyExc_ImportError)) {
PyErr_Clear();
}
else
m = NULL;
goto cleanup;
}
m = load_module(name, fp, buf, fdp->type);
if (fp != NULL)
fclose(fp);
cleanup:
Py_XINCREF(m);
Py_XDECREF(path);
Py_XDECREF(file);
return m;
}
/* Helper to test for built-in module */
static int
is_builtin(name)
char *name;
{
int i;
for (i = 0; PyImport_Inittab[i].name != NULL; i++) {
if (strcmp(name, PyImport_Inittab[i].name) == 0) {
if (PyImport_Inittab[i].initfunc == NULL)
return -1;
else
return 1;
}
}
return 0;
}
/* Search the path (default sys.path) for a module. Return the
corresponding filedescr struct, and (via return arguments) the
pathname and an open file. Return NULL if the module is not found. */
#ifdef MS_COREDLL
extern FILE *PyWin_FindRegisteredModule();
#endif
static int find_init_module Py_PROTO((char *)); /* Forward */
static struct filedescr *
find_module(name, path, buf, buflen, p_fp)
char *name;
PyObject *path;
/* Output parameters: */
char *buf;
int buflen;
FILE **p_fp;
{
int i, npath, len, namelen;
struct filedescr *fdp = NULL;
FILE *fp = NULL;
struct stat statbuf;
if (path == NULL) {
if (is_builtin(name)) {
static struct filedescr fd = {"", "", C_BUILTIN};
return &fd;
}
if (find_frozen(name) != NULL) {
static struct filedescr fd = {"", "", PY_FROZEN};
return &fd;
}
#ifdef MS_COREDLL
fp = PyWin_FindRegisteredModule(name, &fdp, buf, buflen);
if (fp != NULL) {
*p_fp = fp;
return fdp;
}
#endif
}
if (path == NULL)
path = PySys_GetObject("path");
if (path == NULL || !PyList_Check(path)) {
PyErr_SetString(PyExc_ImportError,
"sys.path must be a list of directory names");
return NULL;
}
npath = PyList_Size(path);
namelen = strlen(name);
for (i = 0; i < npath; i++) {
PyObject *v = PyList_GetItem(path, i);
if (!PyString_Check(v))
continue;
len = PyString_Size(v);
if (len + 2 + namelen + MAXSUFFIXSIZE >= buflen)
continue; /* Too long */
strcpy(buf, PyString_AsString(v));
if ((int)strlen(buf) != len)
continue; /* v contains '\0' */
#ifdef macintosh
#ifdef INTERN_STRINGS
/*
** Speedup: each sys.path item is interned, and
** FindResourceModule remembers which items refer to
** folders (so we don't have to bother trying to look
** into them for resources).
*/
PyString_InternInPlace(&PyList_GET_ITEM(path, i));
v = PyList_GET_ITEM(path, i);
#endif
if (PyMac_FindResourceModule((PyStringObject *)v, name, buf)) {
static struct filedescr resfiledescr =
{"", "", PY_RESOURCE};
return &resfiledescr;
}
#endif
if (len > 0 && buf[len-1] != SEP
#ifdef ALTSEP
&& buf[len-1] != ALTSEP
#endif
)
buf[len++] = SEP;
#ifdef IMPORT_8x3_NAMES
/* see if we are searching in directory dos_8x3 */
if (len > 7 && !strncmp(buf + len - 8, "dos_8x3", 7)){
int j;
char ch; /* limit name to 8 lower-case characters */
for (j = 0; (ch = name[j]) && j < 8; j++)
if (isupper(ch))
buf[len++] = tolower(ch);
else
buf[len++] = ch;
}
else /* Not in dos_8x3, use the full name */
#endif
{
strcpy(buf+len, name);
len += namelen;
}
#ifdef HAVE_STAT
if (stat(buf, &statbuf) == 0) {
static struct filedescr fd = {"", "", PKG_DIRECTORY};
if (S_ISDIR(statbuf.st_mode)) {
if (find_init_module(buf))
return &fd;
}
}
#else
/* XXX How are you going to test for directories? */
#endif
#ifdef macintosh
fdp = PyMac_FindModuleExtension(buf, &len, name);
if (fdp)
fp = fopen(buf, fdp->mode);
#else
for (fdp = _PyImport_Filetab; fdp->suffix != NULL; fdp++) {
strcpy(buf+len, fdp->suffix);
if (Py_VerboseFlag > 1)
fprintf(stderr, "# trying %s\n", buf);
fp = fopen(buf, fdp->mode);
if (fp != NULL)
break;
}
#endif /* !macintosh */
if (fp != NULL)
break;
}
if (fp == NULL) {
PyErr_Format(PyExc_ImportError,
"No module named %.200s", name);
return NULL;
}
*p_fp = fp;
return fdp;
}
#ifdef HAVE_STAT
/* Helper to look for __init__.py or __init__.py[co] in potential package */
static int
find_init_module(buf)
char *buf;
{
int save_len = strlen(buf);
int i = save_len;
struct stat statbuf;
if (save_len + 13 >= MAXPATHLEN)
return 0;
buf[i++] = SEP;
strcpy(buf+i, "__init__.py");
if (stat(buf, &statbuf) == 0) {
buf[save_len] = '\0';
return 1;
}
i += strlen(buf+i);
if (Py_OptimizeFlag)
strcpy(buf+i, "o");
else
strcpy(buf+i, "c");
if (stat(buf, &statbuf) == 0) {
buf[save_len] = '\0';
return 1;
}
buf[save_len] = '\0';
return 0;
}
#endif /* HAVE_STAT */
static int init_builtin Py_PROTO((char *)); /* Forward */
/* Load an external module using the default search path and return
its module object WITH INCREMENTED REFERENCE COUNT */
static PyObject *
load_module(name, fp, buf, type)
char *name;
FILE *fp;
char *buf;
int type;
{
PyObject *modules;
PyObject *m;
int err;
/* First check that there's an open file (if we need one) */
switch (type) {
case PY_SOURCE:
case PY_COMPILED:
if (fp == NULL) {
PyErr_Format(PyExc_ValueError,
"file object required for import (type code %d)",
type);
return NULL;
}
}
switch (type) {
case PY_SOURCE:
m = load_source_module(name, buf, fp);
break;
case PY_COMPILED:
m = load_compiled_module(name, buf, fp);
break;
case C_EXTENSION:
m = _PyImport_LoadDynamicModule(name, buf, fp);
break;
#ifdef macintosh
case PY_RESOURCE:
m = PyMac_LoadResourceModule(name, buf);
break;
#endif
case PKG_DIRECTORY:
m = load_package(name, buf);
break;
case C_BUILTIN:
case PY_FROZEN:
if (type == C_BUILTIN)
err = init_builtin(name);
else
err = PyImport_ImportFrozenModule(name);
if (err < 0)
return NULL;
if (err == 0) {
PyErr_Format(PyExc_ImportError,
"Purported %s module %.200s not found",
type == C_BUILTIN ?
"builtin" : "frozen",
name);
return NULL;
}
modules = PyImport_GetModuleDict();
m = PyDict_GetItemString(modules, name);
if (m == NULL) {
PyErr_Format(
PyExc_ImportError,
"%s module %.200s not properly initialized",
type == C_BUILTIN ?
"builtin" : "frozen",
name);
return NULL;
}
Py_INCREF(m);
break;
default:
PyErr_Format(PyExc_ImportError,
"Don't know how to import %.200s (type code %d)",
name, type);
m = NULL;
}
return m;
}
/* Initialize a built-in module.
Return 1 for succes, 0 if the module is not found, and -1 with
an exception set if the initialization failed. */
static int
init_builtin(name)
char *name;
{
struct _inittab *p;
PyObject *mod;
if ((mod = _PyImport_FindExtension(name, name)) != NULL)
return 1;
for (p = PyImport_Inittab; p->name != NULL; p++) {
if (strcmp(name, p->name) == 0) {
if (p->initfunc == NULL) {
PyErr_Format(PyExc_ImportError,
"Cannot re-init internal module %.200s",
name);
return -1;
}
if (Py_VerboseFlag)
fprintf(stderr, "import %s # builtin\n", name);
(*p->initfunc)();
if (PyErr_Occurred())
return -1;
if (_PyImport_FixupExtension(name, name) == NULL)
return -1;
return 1;
}
}
return 0;
}
/* Frozen modules */
static struct _frozen *
find_frozen(name)
char *name;
{
struct _frozen *p;
for (p = PyImport_FrozenModules; ; p++) {
if (p->name == NULL)
return NULL;
if (strcmp(p->name, name) == 0)
break;
}
return p;
}
static PyObject *
get_frozen_object(name)
char *name;
{
struct _frozen *p = find_frozen(name);
if (p == NULL) {
PyErr_Format(PyExc_ImportError,
"No such frozen object named %.200s",
name);
return NULL;
}
return PyMarshal_ReadObjectFromString((char *)p->code, p->size);
}
/* Initialize a frozen module.
Return 1 for succes, 0 if the module is not found, and -1 with
an exception set if the initialization failed.
This function is also used from frozenmain.c */
int
PyImport_ImportFrozenModule(name)
char *name;
{
struct _frozen *p = find_frozen(name);
PyObject *co;
PyObject *m;
if (p == NULL)
return 0;
if (Py_VerboseFlag)
fprintf(stderr, "import %s # frozen\n", name);
co = PyMarshal_ReadObjectFromString((char *)p->code, p->size);
if (co == NULL)
return -1;
if (!PyCode_Check(co)) {
Py_DECREF(co);
PyErr_Format(PyExc_TypeError,
"frozen object %.200s is not a code object",
name);
return -1;
}
m = PyImport_ExecCodeModule(name, co);
Py_DECREF(co);
if (m == NULL)
return -1;
Py_DECREF(m);
return 1;
}
/* Import a module, either built-in, frozen, or external, and return
its module object WITH INCREMENTED REFERENCE COUNT */
PyObject *
PyImport_ImportModule(name)
char *name;
{
static PyObject *fromlist = NULL;
if (fromlist == NULL && strchr(name, '.') != NULL) {
fromlist = Py_BuildValue("[s]", "*");
if (fromlist == NULL)
return NULL;
}
return PyImport_ImportModuleEx(name, NULL, NULL, fromlist);
}
/* Forward declarations for helper routines */
static PyObject *get_parent Py_PROTO((PyObject *globals,
char *buf, int *p_buflen));
static PyObject *load_next Py_PROTO((PyObject *mod, PyObject *altmod,
char **p_name, char *buf, int *p_buflen));
static int mark_miss Py_PROTO((char *name));
static int ensure_fromlist Py_PROTO((PyObject *mod, PyObject *fromlist,
char *buf, int buflen, int recursive));
static PyObject * import_submodule Py_PROTO((PyObject *mod,
char *name, char *fullname));
/* The Magnum Opus of dotted-name import :-) */
/* XXX TO DO:
- Remember misses in package directories so package submodules
that all import the same toplevel module don't keep hitting on the
package directory first
*/
PyObject *
PyImport_ImportModuleEx(name, globals, locals, fromlist)
char *name;
PyObject *globals;
PyObject *locals;
PyObject *fromlist;
{
char buf[MAXPATHLEN+1];
int buflen = 0;
PyObject *parent, *head, *next, *tail;
parent = get_parent(globals, buf, &buflen);
if (parent == NULL)
return NULL;
head = load_next(parent, Py_None, &name, buf, &buflen);
if (head == NULL)
return NULL;
tail = head;
Py_INCREF(tail);
while (name) {
next = load_next(tail, tail, &name, buf, &buflen);
Py_DECREF(tail);
if (next == NULL) {
Py_DECREF(head);
return NULL;
}
tail = next;
}
if (fromlist != NULL) {
if (fromlist == Py_None || !PyObject_IsTrue(fromlist))
fromlist = NULL;
}
if (fromlist == NULL) {
Py_DECREF(tail);
return head;
}
Py_DECREF(head);
if (!ensure_fromlist(tail, fromlist, buf, buflen, 0)) {
Py_DECREF(tail);
return NULL;
}
return tail;
}
static PyObject *
get_parent(globals, buf, p_buflen)
PyObject *globals;
char *buf;
int *p_buflen;
{
static PyObject *namestr = NULL;
static PyObject *pathstr = NULL;
PyObject *modname, *modpath, *modules, *parent;
if (globals == NULL || !PyDict_Check(globals))
return Py_None;
if (namestr == NULL) {
namestr = PyString_InternFromString("__name__");
if (namestr == NULL)
return NULL;
}
if (pathstr == NULL) {
pathstr = PyString_InternFromString("__path__");
if (pathstr == NULL)
return NULL;
}
*buf = '\0';
*p_buflen = 0;
modname = PyDict_GetItem(globals, namestr);
if (modname == NULL || !PyString_Check(modname))
return Py_None;
modpath = PyDict_GetItem(globals, pathstr);
if (modpath != NULL) {
int len = PyString_GET_SIZE(modname);
if (len > MAXPATHLEN) {
PyErr_SetString(PyExc_ValueError,
"Module name too long");
return NULL;
}
strcpy(buf, PyString_AS_STRING(modname));
*p_buflen = len;
}
else {
char *start = PyString_AS_STRING(modname);
char *lastdot = strrchr(start, '.');
int len;
if (lastdot == NULL)
return Py_None;
len = lastdot - start;
if (len >= MAXPATHLEN) {
PyErr_SetString(PyExc_ValueError,
"Module name too long");
return NULL;
}
strncpy(buf, start, len);
buf[len] = '\0';
*p_buflen = len;
}
modules = PyImport_GetModuleDict();
parent = PyDict_GetItemString(modules, buf);
if (parent == NULL)
parent = Py_None;
return parent;
/* We expect, but can't guarantee, if parent != None, that:
- parent.__name__ == buf
- parent.__dict__ is globals
If this is violated... Who cares? */
}
static PyObject *
load_next(mod, altmod, p_name, buf, p_buflen)
PyObject *mod;
PyObject *altmod; /* Either None or same as mod */
char **p_name;
char *buf;
int *p_buflen;
{
char *name = *p_name;
char *dot = strchr(name, '.');
int len;
char *p;
PyObject *result;
if (dot == NULL) {
*p_name = NULL;
len = strlen(name);
}
else {
*p_name = dot+1;
len = dot-name;
}
p = buf + *p_buflen;
if (p != buf)
*p++ = '.';
if (p+len-buf >= MAXPATHLEN) {
PyErr_SetString(PyExc_ValueError,
"Module name too long");
return NULL;
}
strncpy(p, name, len);
p[len] = '\0';
*p_buflen = p+len-buf;
result = import_submodule(mod, p, buf);
if (result == Py_None && altmod != mod) {
Py_DECREF(result);
/* Here, altmod must be None and mod must not be None */
result = import_submodule(altmod, p, p);
if (result != NULL && result != Py_None) {
if (mark_miss(buf) != 0) {
Py_DECREF(result);
return NULL;
}
strncpy(buf, name, len);
buf[len] = '\0';
*p_buflen = len;
}
}
if (result == NULL)
return NULL;
if (result == Py_None) {
Py_DECREF(result);
PyErr_Format(PyExc_ImportError,
"No module named %.200s", name);
return NULL;
}
return result;
}
static int
mark_miss(name)
char *name;
{
PyObject *modules = PyImport_GetModuleDict();
return PyDict_SetItemString(modules, name, Py_None);
}
static int
ensure_fromlist(mod, fromlist, buf, buflen, recursive)
PyObject *mod;
PyObject *fromlist;
char *buf;
int buflen;
int recursive;
{
int i;
if (!PyObject_HasAttrString(mod, "__path__"))
return 1;
for (i = 0; ; i++) {
PyObject *item = PySequence_GetItem(fromlist, i);
int hasit;
if (item == NULL) {
if (PyErr_ExceptionMatches(PyExc_IndexError)) {
PyErr_Clear();
return 1;
}
return 0;
}
if (!PyString_Check(item)) {
PyErr_SetString(PyExc_TypeError,
"Item in ``from list'' not a string");
Py_DECREF(item);
return 0;
}
if (PyString_AS_STRING(item)[0] == '*') {
PyObject *all;
Py_DECREF(item);
/* See if the package defines __all__ */
if (recursive)
continue; /* Avoid endless recursion */
all = PyObject_GetAttrString(mod, "__all__");
if (all == NULL)
PyErr_Clear();
else {
if (!ensure_fromlist(mod, all, buf, buflen, 1))
return 0;
Py_DECREF(all);
}
continue;
}
hasit = PyObject_HasAttr(mod, item);
if (!hasit) {
char *subname = PyString_AS_STRING(item);
PyObject *submod;
char *p;
if (buflen + strlen(subname) >= MAXPATHLEN) {
PyErr_SetString(PyExc_ValueError,
"Module name too long");
Py_DECREF(item);
return 0;
}
p = buf + buflen;
*p++ = '.';
strcpy(p, subname);
submod = import_submodule(mod, subname, buf);
Py_XDECREF(submod);
if (submod == NULL) {
Py_DECREF(item);
return 0;
}
}
Py_DECREF(item);
}
/* NOTREACHED */
}
static PyObject *
import_submodule(mod, subname, fullname)
PyObject *mod; /* May be None */
char *subname;
char *fullname;
{
PyObject *modules = PyImport_GetModuleDict();
PyObject *m;
/* Require:
if mod == None: subname == fullname
else: mod.__name__ + "." + subname == fullname
*/
if ((m = PyDict_GetItemString(modules, fullname)) != NULL) {
Py_INCREF(m);
}
else {
PyObject *path;
char buf[MAXPATHLEN+1];
struct filedescr *fdp;
FILE *fp = NULL;
path = PyObject_GetAttrString(mod, "__path__");
if (path == NULL)
PyErr_Clear();
buf[0] = '\0';
fdp = find_module(subname, path,
buf, MAXPATHLEN+1, &fp);
if (fdp == NULL) {
if (!PyErr_ExceptionMatches(PyExc_ImportError))
return NULL;
PyErr_Clear();
Py_INCREF(Py_None);
return Py_None;
}
m = load_module(fullname, fp, buf, fdp->type);
if (fp)
fclose(fp);
if (m != NULL && mod != Py_None) {
if (PyObject_SetAttrString(mod, subname, m) < 0) {
Py_DECREF(m);
m = NULL;
}
}
}
return m;
}
/* Re-import a module of any kind and return its module object, WITH
INCREMENTED REFERENCE COUNT */
PyObject *
PyImport_ReloadModule(m)
PyObject *m;
{
PyObject *modules = PyImport_GetModuleDict();
PyObject *path = NULL;
char *name, *subname;
char buf[MAXPATHLEN+1];
struct filedescr *fdp;
FILE *fp = NULL;
if (m == NULL || !PyModule_Check(m)) {
PyErr_SetString(PyExc_TypeError,
"reload() argument must be module");
return NULL;
}
name = PyModule_GetName(m);
if (name == NULL)
return NULL;
if (m != PyDict_GetItemString(modules, name)) {
PyErr_Format(PyExc_ImportError,
"reload(): module %.200s not in sys.modules",
name);
return NULL;
}
subname = strrchr(name, '.');
if (subname == NULL)
subname = name;
else {
PyObject *parentname, *parent;
parentname = PyString_FromStringAndSize(name, (subname-name));
if (parentname == NULL)
return NULL;
parent = PyDict_GetItem(modules, parentname);
if (parent == NULL) {
PyErr_Format(PyExc_ImportError,
"reload(): parent %.200s not in sys.modules",
name);
return NULL;
}
subname++;
path = PyObject_GetAttrString(parent, "__path__");
if (path == NULL)
PyErr_Clear();
}
buf[0] = '\0';
fdp = find_module(subname, path, buf, MAXPATHLEN+1, &fp);
Py_XDECREF(path);
if (fdp == NULL)
return NULL;
m = load_module(name, fp, buf, fdp->type);
if (fp)
fclose(fp);
return m;
}
/* Higher-level import emulator which emulates the "import" statement
more accurately -- it invokes the __import__() function from the
builtins of the current globals. This means that the import is
done using whatever import hooks are installed in the current
environment, e.g. by "ni" or "rexec". */
PyObject *
PyImport_Import(module_name)
PyObject *module_name;
{
static PyObject *silly_list = NULL;
static PyObject *builtins_str = NULL;
static PyObject *import_str = NULL;
static PyObject *standard_builtins = NULL;
PyObject *globals = NULL;
PyObject *import = NULL;
PyObject *builtins = NULL;
PyObject *r = NULL;
/* Initialize constant string objects */
if (silly_list == NULL) {
import_str = PyString_InternFromString("__import__");
if (import_str == NULL)
return NULL;
builtins_str = PyString_InternFromString("__builtins__");
if (builtins_str == NULL)
return NULL;
silly_list = Py_BuildValue("[s]", "__doc__");
if (silly_list == NULL)
return NULL;
}
/* Get the builtins from current globals */
globals = PyEval_GetGlobals();
if(globals != NULL) {
builtins = PyObject_GetItem(globals, builtins_str);
if (builtins == NULL)
goto err;
}
else {
/* No globals -- use standard builtins, and fake globals */
PyErr_Clear();
if (standard_builtins == NULL) {
standard_builtins =
PyImport_ImportModule("__builtin__");
if (standard_builtins == NULL)
return NULL;
}
builtins = standard_builtins;
Py_INCREF(builtins);
globals = Py_BuildValue("{OO}", builtins_str, builtins);
if (globals == NULL)
goto err;
}
/* Get the __import__ function from the builtins */
if (PyDict_Check(builtins))
import=PyObject_GetItem(builtins, import_str);
else
import=PyObject_GetAttr(builtins, import_str);
if (import == NULL)
goto err;
/* Call the _import__ function with the proper argument list */
r = PyObject_CallFunction(import, "OOOO",
module_name, globals, globals, silly_list);
err:
Py_XDECREF(globals);
Py_XDECREF(builtins);
Py_XDECREF(import);
return r;
}
/* Module 'imp' provides Python access to the primitives used for
importing modules.
*/
static PyObject *
imp_get_magic(self, args)
PyObject *self;
PyObject *args;
{
char buf[4];
if (!PyArg_ParseTuple(args, ""))
return NULL;
buf[0] = (char) ((MAGIC >> 0) & 0xff);
buf[1] = (char) ((MAGIC >> 8) & 0xff);
buf[2] = (char) ((MAGIC >> 16) & 0xff);
buf[3] = (char) ((MAGIC >> 24) & 0xff);
return PyString_FromStringAndSize(buf, 4);
}
static PyObject *
imp_get_suffixes(self, args)
PyObject *self;
PyObject *args;
{
PyObject *list;
struct filedescr *fdp;
if (!PyArg_ParseTuple(args, ""))
return NULL;
list = PyList_New(0);
if (list == NULL)
return NULL;
for (fdp = _PyImport_Filetab; fdp->suffix != NULL; fdp++) {
PyObject *item = Py_BuildValue("ssi",
fdp->suffix, fdp->mode, fdp->type);
if (item == NULL) {
Py_DECREF(list);
return NULL;
}
if (PyList_Append(list, item) < 0) {
Py_DECREF(list);
Py_DECREF(item);
return NULL;
}
Py_DECREF(item);
}
return list;
}
static PyObject *
call_find_module(name, path)
char *name;
PyObject *path; /* list or None or NULL */
{
extern int fclose Py_PROTO((FILE *));
PyObject *fob, *ret;
struct filedescr *fdp;
char pathname[MAXPATHLEN+1];
FILE *fp = NULL;
pathname[0] = '\0';
if (path == Py_None)
path = NULL;
fdp = find_module(name, path, pathname, MAXPATHLEN+1, &fp);
if (fdp == NULL)
return NULL;
if (fp != NULL) {
fob = PyFile_FromFile(fp, pathname, fdp->mode, fclose);
if (fob == NULL) {
fclose(fp);
return NULL;
}
}
else {
fob = Py_None;
Py_INCREF(fob);
}
ret = Py_BuildValue("Os(ssi)",
fob, pathname, fdp->suffix, fdp->mode, fdp->type);
Py_DECREF(fob);
return ret;
}
static PyObject *
imp_find_module(self, args)
PyObject *self;
PyObject *args;
{
char *name;
PyObject *path = NULL;
if (!PyArg_ParseTuple(args, "s|O", &name, &path))
return NULL;
return call_find_module(name, path);
}
static PyObject *
imp_init_builtin(self, args)
PyObject *self;
PyObject *args;
{
char *name;
int ret;
PyObject *m;
if (!PyArg_ParseTuple(args, "s", &name))
return NULL;
ret = init_builtin(name);
if (ret < 0)
return NULL;
if (ret == 0) {
Py_INCREF(Py_None);
return Py_None;
}
m = PyImport_AddModule(name);
Py_XINCREF(m);
return m;
}
static PyObject *
imp_init_frozen(self, args)
PyObject *self;
PyObject *args;
{
char *name;
int ret;
PyObject *m;
if (!PyArg_ParseTuple(args, "s", &name))
return NULL;
ret = PyImport_ImportFrozenModule(name);
if (ret < 0)
return NULL;
if (ret == 0) {
Py_INCREF(Py_None);
return Py_None;
}
m = PyImport_AddModule(name);
Py_XINCREF(m);
return m;
}
static PyObject *
imp_get_frozen_object(self, args)
PyObject *self;
PyObject *args;
{
char *name;
if (!PyArg_ParseTuple(args, "s", &name))
return NULL;
return get_frozen_object(name);
}
static PyObject *
imp_is_builtin(self, args)
PyObject *self;
PyObject *args;
{
char *name;
if (!PyArg_ParseTuple(args, "s", &name))
return NULL;
return PyInt_FromLong(is_builtin(name));
}
static PyObject *
imp_is_frozen(self, args)
PyObject *self;
PyObject *args;
{
char *name;
if (!PyArg_ParseTuple(args, "s", &name))
return NULL;
return PyInt_FromLong(find_frozen(name) != NULL);
}
static FILE *
get_file(pathname, fob, mode)
char *pathname;
PyObject *fob;
char *mode;
{
FILE *fp;
if (fob == NULL) {
fp = fopen(pathname, mode);
if (fp == NULL)
PyErr_SetFromErrno(PyExc_IOError);
}
else {
fp = PyFile_AsFile(fob);
if (fp == NULL)
PyErr_SetString(PyExc_ValueError,
"bad/closed file object");
}
return fp;
}
static PyObject *
imp_load_compiled(self, args)
PyObject *self;
PyObject *args;
{
char *name;
char *pathname;
PyObject *fob = NULL;
PyObject *m;
FILE *fp;
if (!PyArg_ParseTuple(args, "ss|O!", &name, &pathname,
&PyFile_Type, &fob))
return NULL;
fp = get_file(pathname, fob, "rb");
if (fp == NULL)
return NULL;
m = load_compiled_module(name, pathname, fp);
if (fob == NULL)
fclose(fp);
return m;
}
static PyObject *
imp_load_dynamic(self, args)
PyObject *self;
PyObject *args;
{
char *name;
char *pathname;
PyObject *fob = NULL;
PyObject *m;
FILE *fp = NULL;
if (!PyArg_ParseTuple(args, "ss|O!", &name, &pathname,
&PyFile_Type, &fob))
return NULL;
if (fob) {
fp = get_file(pathname, fob, "r");
if (fp == NULL)
return NULL;
}
m = _PyImport_LoadDynamicModule(name, pathname, fp);
return m;
}
static PyObject *
imp_load_source(self, args)
PyObject *self;
PyObject *args;
{
char *name;
char *pathname;
PyObject *fob = NULL;
PyObject *m;
FILE *fp;
if (!PyArg_ParseTuple(args, "ss|O!", &name, &pathname,
&PyFile_Type, &fob))
return NULL;
fp = get_file(pathname, fob, "r");
if (fp == NULL)
return NULL;
m = load_source_module(name, pathname, fp);
if (fob == NULL)
fclose(fp);
return m;
}
#ifdef macintosh
static PyObject *
imp_load_resource(self, args)
PyObject *self;
PyObject *args;
{
char *name;
char *pathname;
PyObject *m;
if (!PyArg_ParseTuple(args, "ss", &name, &pathname))
return NULL;
m = PyMac_LoadResourceModule(name, pathname);
return m;
}
#endif /* macintosh */
static PyObject *
imp_load_module(self, args)
PyObject *self;
PyObject *args;
{
char *name;
PyObject *fob;
char *pathname;
char *suffix; /* Unused */
char *mode;
int type;
FILE *fp;
if (!PyArg_ParseTuple(args, "sOs(ssi)",
&name, &fob, &pathname,
&suffix, &mode, &type))
return NULL;
if (*mode && (*mode != 'r' || strchr(mode, '+') != NULL)) {
PyErr_Format(PyExc_ValueError,
"invalid file open mode %.200s", mode);
return NULL;
}
if (fob == Py_None)
fp = NULL;
else {
if (!PyFile_Check(fob)) {
PyErr_SetString(PyExc_ValueError,
"load_module arg#2 should be a file or None");
return NULL;
}
fp = get_file(pathname, fob, mode);
if (fp == NULL)
return NULL;
}
return load_module(name, fp, pathname, type);
}
static PyObject *
imp_load_package(self, args)
PyObject *self;
PyObject *args;
{
char *name;
char *pathname;
if (!PyArg_ParseTuple(args, "ss", &name, &pathname))
return NULL;
return load_package(name, pathname);
}
static PyObject *
imp_new_module(self, args)
PyObject *self;
PyObject *args;
{
char *name;
if (!PyArg_ParseTuple(args, "s", &name))
return NULL;
return PyModule_New(name);
}
/* Doc strings */
static char doc_imp[] = "\
This module provides the components needed to build your own\n\
__import__ function. Undocumented functions are obsolete.\n\
";
static char doc_find_module[] = "\
find_module(name, [path]) -> (file, filename, (suffix, mode, type))\n\
Search for a module. If path is omitted or None, search for a\n\
built-in, frozen or special module and continue search in sys.path.\n\
The module name cannot contain '.'; to search for a submodule of a\n\
package, pass the submodule name and the package's __path__.\
";
static char doc_load_module[] = "\
load_module(name, file, filename, (suffix, mode, type)) -> module\n\
Load a module, given information returned by find_module().\n\
The module name must include the full package name, if any.\
";
static char doc_get_magic[] = "\
get_magic() -> string\n\
Return the magic number for .pyc or .pyo files.\
";
static char doc_get_suffixes[] = "\
get_suffixes() -> [(suffix, mode, type), ...]\n\
Return a list of (suffix, mode, type) tuples describing the files\n\
that find_module() looks for.\
";
static char doc_new_module[] = "\
new_module(name) -> module\n\
Create a new module. Do not enter it in sys.modules.\n\
The module name must include the full package name, if any.\
";
static PyMethodDef imp_methods[] = {
{"find_module", imp_find_module, 1, doc_find_module},
{"get_magic", imp_get_magic, 1, doc_get_magic},
{"get_suffixes", imp_get_suffixes, 1, doc_get_suffixes},
{"load_module", imp_load_module, 1, doc_load_module},
{"new_module", imp_new_module, 1, doc_new_module},
/* The rest are obsolete */
{"get_frozen_object", imp_get_frozen_object, 1},
{"init_builtin", imp_init_builtin, 1},
{"init_frozen", imp_init_frozen, 1},
{"is_builtin", imp_is_builtin, 1},
{"is_frozen", imp_is_frozen, 1},
{"load_compiled", imp_load_compiled, 1},
{"load_dynamic", imp_load_dynamic, 1},
{"load_package", imp_load_package, 1},
#ifdef macintosh
{"load_resource", imp_load_resource, 1},
#endif
{"load_source", imp_load_source, 1},
{NULL, NULL} /* sentinel */
};
int
setint(d, name, value)
PyObject *d;
char *name;
int value;
{
PyObject *v;
int err;
v = PyInt_FromLong((long)value);
err = PyDict_SetItemString(d, name, v);
Py_XDECREF(v);
return err;
}
void
initimp()
{
PyObject *m, *d;
m = Py_InitModule4("imp", imp_methods, doc_imp,
NULL, PYTHON_API_VERSION);
d = PyModule_GetDict(m);
if (setint(d, "SEARCH_ERROR", SEARCH_ERROR) < 0) goto failure;
if (setint(d, "PY_SOURCE", PY_SOURCE) < 0) goto failure;
if (setint(d, "PY_COMPILED", PY_COMPILED) < 0) goto failure;
if (setint(d, "C_EXTENSION", C_EXTENSION) < 0) goto failure;
if (setint(d, "PY_RESOURCE", PY_RESOURCE) < 0) goto failure;
if (setint(d, "PKG_DIRECTORY", PKG_DIRECTORY) < 0) goto failure;
if (setint(d, "C_BUILTIN", C_BUILTIN) < 0) goto failure;
if (setint(d, "PY_FROZEN", PY_FROZEN) < 0) goto failure;
failure:
;
}
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