/***********************************************************

Copyright 1991, 1992, 1993 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 not be used in advertising or publicity pertaining to

distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO

THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM 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 "allobjects.h"

#include "node.h"

#include "token.h"

#include "graminit.h"

#include "import.h"

#include "errcode.h"

#include "sysmodule.h"

#include "pythonrun.h"

#include "marshal.h"

#include "compile.h"

#include "eval.h"

#include "osdefs.h"

extern int verbose; /* Defined in pythonmain.c */

#ifdef DEBUG

#define D(x) x

#else

#define D(x)

#endif

#ifdef USE_DL

#include "dl.h"

extern char *argv0;

#endif

/* Magic word to reject .pyc files generated by other Python versions */

#define MAGIC 0x999901L /* Increment by one for each incompatible change */

static object *modules;

/* Forward */

static int init_builtin PROTO((char *));

/* Initialization */

void

initimport()

{

if ((modules = newdictobject()) == NULL)

fatal("no mem for dictionary of modules");

}

object *

get_modules()

{

return modules;

}

object *

add_module(name)

char *name;

{

object *m;

if ((m = dictlookup(modules, name)) != NULL && is_moduleobject(m))

return m;

m = newmoduleobject(name);

if (m == NULL)

return NULL;

if (dictinsert(modules, name, m) != 0) {

DECREF(m);

return NULL;

}

DECREF(m); /* Yes, it still exists, in modules! */

return m;

}

/* Suffixes used by open_module: */

#define PY_SUFFIX ".py"

#ifdef USE_DL

#define O_SUFFIX "module.o"

#endif

/* Find and open a module file, using sys.path.

Return a NULL pointer if no module file is found.

When dynamic loading is enabled, the contents of namebuf

is important when NULL is returned: if namebuf[0] != '\0'

a dl-able object file was found and namebuf is its pathname. */

static FILE *

open_module(name, namebuf)

char *name;

char *namebuf; /* XXX No buffer overflow checks! */

{

object *path;

FILE *fp;

path = sysget("path");

if (path == NULL || !is_listobject(path)) {

/* No path -- at least try current directory */

#ifdef USE_DL

strcpy(namebuf, name);

strcat(namebuf, O_SUFFIX);

if (getmtime(namebuf) > 0)

return NULL;

#endif

strcpy(namebuf, name);

strcat(namebuf, PY_SUFFIX);

fp = fopen(namebuf, "r");

}

else {

int npath = getlistsize(path);

int i;

fp = NULL;

for (i = 0; i < npath; i++) {

object *v = getlistitem(path, i);

int len;

if (!is_stringobject(v))

continue;

strcpy(namebuf, getstringvalue(v));

len = getstringsize(v);

if (len > 0 && namebuf[len-1] != SEP)

namebuf[len++] = SEP;

#ifdef USE_DL

strcpy(namebuf+len, name);

strcat(namebuf, O_SUFFIX);

if (getmtime(namebuf) > 0)

return NULL;

#endif

strcpy(namebuf+len, name);

strcat(namebuf, PY_SUFFIX);

fp = fopen(namebuf, "r");

if (fp != NULL)

break;

}

}

if (fp == NULL)

namebuf[0] = '\0';

return fp;

}

static object *

get_module(m, name, m_ret)

/*module*/object *m;

char *name;

object **m_ret;

{

codeobject *co = NULL;

object *v, *d;

FILE *fp, *fpc;

node *n;

int err;

char namebuf[MAXPATHLEN+1];

int namelen;

long mtime;

extern long getmtime();

fp = open_module(name, namebuf);

if (fp == NULL) {

#ifdef USE_DL

if (namebuf[0] != '\0') {

char funcname[258];

dl_funcptr p;

D(fprintf(stderr, "Found %s\n", namebuf));

sprintf(funcname, "init%s", name);

p = dl_loadmod(argv0, namebuf, funcname);

if (p == NULL) {

D(fprintf(stderr, "dl_loadmod failed\n"));

}

else {

if (verbose)

fprintf(stderr,

"import %s # dynamically loaded from \"%s\"\n",

name, namebuf);

(*p)();

*m_ret = m = dictlookup(modules, name);

if (m == NULL) {

err_setstr(SystemError,

"dynamic module missing");

return NULL;

}

else {

D(fprintf(stderr,

"module %s loaded!\n", name));

INCREF(None);

return None;

}

}

}

#endif

if (m == NULL) {

sprintf(namebuf, "no module named %.200s", name);

err_setstr(ImportError, namebuf);

}

else {

sprintf(namebuf, "no source for module %.200s", name);

err_setstr(ImportError, namebuf);

}

return NULL;

}

/* Get mtime -- always useful */

mtime = getmtime(namebuf);

/* Check ".pyc" file first */

namelen = strlen(namebuf);

namebuf[namelen] = 'c';

namebuf[namelen+1] = '\0';

fpc = fopen(namebuf, "rb");

if (fpc != NULL) {

long pyc_mtime;

long magic;

magic = rd_long(fpc);

pyc_mtime = rd_long(fpc);

if (magic == MAGIC && pyc_mtime == mtime && mtime != 0 && mtime != -1) {

v = rd_object(fpc);

if (v == NULL || err_occurred() || !is_codeobject(v)) {

err_clear();

XDECREF(v);

}

else

co = (codeobject *)v;

}

fclose(fpc);

if (verbose) {

if (co != NULL)

fprintf(stderr,

"import %s # precompiled from \"%s\"\n",

name, namebuf);

else

fprintf(stderr,

"# invalid precompiled file \"%s\"\n",

namebuf);

}

}

namebuf[namelen] = '\0';

if (co == NULL) {

if (verbose)

fprintf(stderr,

"import %s # from \"%s\"\n",

name, namebuf);

err = parse_file(fp, namebuf, file_input, &n);

}

else

err = E_DONE;

fclose(fp);

if (err != E_DONE) {

err_input(err);

return NULL;

}

if (m == NULL) {

m = add_module(name);

if (m == NULL) {

freetree(n);

return NULL;

}

*m_ret = m;

}

d = getmoduledict(m);

if (co == NULL) {

co = compile(n, namebuf);

freetree(n);

if (co == NULL)

return NULL;

/* Now write the code object to the ".pyc" file */

namebuf[namelen] = 'c';

namebuf[namelen+1] = '\0';

fpc = fopen(namebuf, "wb");

if (fpc != NULL) {

wr_long(MAGIC, fpc);

/* First write a 0 for mtime */

wr_long(0L, fpc);

wr_object((object *)co, fpc);

if (ferror(fpc)) {

/* Don't keep partial file */

fclose(fpc);

(void) unlink(namebuf);

}

else {

/* Now write the true mtime */

fseek(fpc, 4L, 0);

wr_long(mtime, fpc);

fflush(fpc);

fclose(fpc);

}

}

}

v = eval_code(co, d, d, (object *)NULL, (object *)NULL);

DECREF(co);

return v;

}

static object *

load_module(name)

char *name;

{

object *m, *v;

v = get_module((object *)NULL, name, &m);

if (v == NULL)

return NULL;

DECREF(v);

return m;

}

object *

import_module(name)

char *name;

{

object *m;

int n;

if ((m = dictlookup(modules, name)) == NULL) {

if ((n = init_builtin(name)) || (n = init_frozen(name))) {

if (n < 0)

return NULL;

if ((m = dictlookup(modules, name)) == NULL)

err_setstr(SystemError,

"builtin module missing");

}

else {

m = load_module(name);

}

}

return m;

}

object *

reload_module(m)

object *m;

{

if (m == NULL || !is_moduleobject(m)) {

err_setstr(TypeError, "reload() argument must be module");

return NULL;

}

/* XXX Ought to check for builtin modules -- can't reload these... */

return get_module(m, getmodulename(m), (object **)NULL);

}

void

doneimport()

{

if (modules != NULL) {

int pos;

object *modname, *module;

/* Explicitly erase all modules; this is the safest way

to get rid of at least *some* circular dependencies */

pos = 0;

while (mappinggetnext(modules, &pos, &modname, &module)) {

if (is_moduleobject(module)) {

object *dict;

dict = getmoduledict(module);

if (dict != NULL && is_dictobject(dict))

mappingclear(dict);

}

}

mappingclear(modules);

}

DECREF(modules);

modules = NULL;

}

/* Initialize built-in modules when first imported */

static int

init_builtin(name)

char *name;

{

int i;

for (i = 0; inittab[i].name != NULL; i++) {

if (strcmp(name, inittab[i].name) == 0) {

if (verbose)

fprintf(stderr, "import %s # builtin\n",

name);

(*inittab[i].initfunc)();

return 1;

}

}

return 0;

}

extern struct frozen {

char *name;

char *code;

int size;

} frozen_modules[];

int

init_frozen(name)

char *name;

{

struct frozen *p;

codeobject *co;

object *m, *d, *v;

for (p = frozen_modules; ; p++) {

if (p->name == NULL)

return 0;

if (strcmp(p->name, name) == 0)

break;

}

if (verbose)

fprintf(stderr, "import %s # frozen\n", name);

co = (codeobject *) rds_object(p->code, p->size);

if (co == NULL)

return -1;

if ((m = add_module(name)) == NULL ||

(d = getmoduledict(m)) == NULL ||

(v = eval_code(co, d, d, (object*)NULL, (object*)NULL)) == NULL) {

DECREF(co);

return -1;

}

DECREF(co);

DECREF(v);

return 1;

}