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https://github.com/python/cpython.git
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341 lines
6.9 KiB
C
341 lines
6.9 KiB
C
/***********************************************************
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Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
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Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Module definition and import implementation */
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#include "allobjects.h"
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#include "node.h"
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#include "token.h"
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#include "graminit.h"
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#include "import.h"
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#include "errcode.h"
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#include "sysmodule.h"
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#include "pythonrun.h"
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#include "marshal.h"
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#include "compile.h"
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#include "ceval.h"
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/* Magic word to reject pre-0.9.4 .pyc files */
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#define MAGIC 0x949494L
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/* Define pathname separator used in file names */
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#ifdef macintosh
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#define SEP ':'
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#endif
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#ifdef MSDOS
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#define SEP '\\'
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#endif
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#ifndef SEP
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#define SEP '/'
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#endif
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static object *modules;
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/* Forward */
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static int init_builtin PROTO((char *));
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/* Initialization */
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void
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initimport()
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{
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if ((modules = newdictobject()) == NULL)
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fatal("no mem for dictionary of modules");
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}
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object *
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get_modules()
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{
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return modules;
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}
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object *
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add_module(name)
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char *name;
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{
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object *m;
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if ((m = dictlookup(modules, name)) != NULL && is_moduleobject(m))
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return m;
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m = newmoduleobject(name);
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if (m == NULL)
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return NULL;
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if (dictinsert(modules, name, m) != 0) {
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DECREF(m);
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return NULL;
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}
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DECREF(m); /* Yes, it still exists, in modules! */
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return m;
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}
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static FILE *
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open_module(name, suffix, namebuf)
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char *name;
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char *suffix;
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char *namebuf; /* XXX No buffer overflow checks! */
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{
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object *path;
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FILE *fp;
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path = sysget("path");
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if (path == NULL || !is_listobject(path)) {
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strcpy(namebuf, name);
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strcat(namebuf, suffix);
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fp = fopen(namebuf, "r");
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}
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else {
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int npath = getlistsize(path);
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int i;
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fp = NULL;
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for (i = 0; i < npath; i++) {
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object *v = getlistitem(path, i);
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int len;
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if (!is_stringobject(v))
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continue;
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strcpy(namebuf, getstringvalue(v));
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len = getstringsize(v);
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if (len > 0 && namebuf[len-1] != SEP)
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namebuf[len++] = SEP;
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strcpy(namebuf+len, name);
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strcat(namebuf, suffix);
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fp = fopen(namebuf, "r");
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if (fp != NULL)
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break;
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}
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}
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return fp;
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}
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static object *
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get_module(m, name, m_ret)
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/*module*/object *m;
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char *name;
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object **m_ret;
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{
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codeobject *co = NULL;
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object *v, *d;
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FILE *fp, *fpc;
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node *n;
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int err;
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char namebuf[258];
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int namelen;
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long mtime;
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extern long getmtime();
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fp = open_module(name, ".py", namebuf);
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if (fp == NULL) {
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if (m == NULL) {
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sprintf(namebuf, "no module named %.200s", name);
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err_setstr(ImportError, namebuf);
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}
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else {
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sprintf(namebuf, "no source for module %.200s", name);
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err_setstr(ImportError, namebuf);
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}
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return NULL;
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}
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/* Get mtime -- always useful */
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mtime = getmtime(namebuf);
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/* Check ".pyc" file first */
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namelen = strlen(namebuf);
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namebuf[namelen] = 'c';
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namebuf[namelen+1] = '\0';
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fpc = fopen(namebuf, "rb");
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if (fpc != NULL) {
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long pyc_mtime;
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long magic;
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magic = rd_long(fpc);
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pyc_mtime = rd_long(fpc);
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if (magic == MAGIC && pyc_mtime == mtime && mtime != 0 && mtime != -1) {
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v = rd_object(fpc);
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if (v == NULL || err_occurred() || !is_codeobject(v)) {
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err_clear();
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XDECREF(v);
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}
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else
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co = (codeobject *)v;
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}
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fclose(fpc);
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}
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namebuf[namelen] = '\0';
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if (co == NULL)
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err = parse_file(fp, namebuf, file_input, &n);
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else
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err = E_DONE;
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fclose(fp);
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if (err != E_DONE) {
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err_input(err);
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return NULL;
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}
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if (m == NULL) {
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m = add_module(name);
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if (m == NULL) {
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freetree(n);
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return NULL;
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}
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*m_ret = m;
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}
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d = getmoduledict(m);
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if (co == NULL) {
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co = compile(n, namebuf);
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freetree(n);
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if (co == NULL)
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return NULL;
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/* Now write the code object to the ".pyc" file */
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namebuf[namelen] = 'c';
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namebuf[namelen+1] = '\0';
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fpc = fopen(namebuf, "wb");
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if (fpc != NULL) {
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wr_long(MAGIC, fpc);
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/* First write a 0 for mtime */
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wr_long(0L, fpc);
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wr_object((object *)co, fpc);
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if (ferror(fpc)) {
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/* Don't keep partial file */
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fclose(fpc);
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(void) unlink(namebuf);
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}
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else {
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/* Now write the true mtime */
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fseek(fpc, 4L, 0);
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wr_long(mtime, fpc);
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fflush(fpc);
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fclose(fpc);
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}
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}
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}
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v = eval_code(co, d, d, (object *)NULL);
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DECREF(co);
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return v;
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}
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static object *
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load_module(name)
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char *name;
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{
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object *m, *v;
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v = get_module((object *)NULL, name, &m);
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if (v == NULL)
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return NULL;
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DECREF(v);
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return m;
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}
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object *
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import_module(name)
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char *name;
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{
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object *m;
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if ((m = dictlookup(modules, name)) == NULL) {
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if (init_builtin(name)) {
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if ((m = dictlookup(modules, name)) == NULL)
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err_setstr(SystemError, "builtin module missing");
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}
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else {
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m = load_module(name);
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}
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}
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return m;
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}
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object *
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reload_module(m)
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object *m;
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{
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if (m == NULL || !is_moduleobject(m)) {
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err_setstr(TypeError, "reload() argument must be module");
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return NULL;
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}
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/* XXX Ought to check for builtin modules -- can't reload these... */
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return get_module(m, getmodulename(m), (object **)NULL);
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}
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static void
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cleardict(d)
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object *d;
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{
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int i;
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for (i = getdictsize(d); --i >= 0; ) {
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char *k;
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k = getdictkey(d, i);
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if (k != NULL)
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(void) dictremove(d, k);
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}
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}
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void
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doneimport()
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{
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if (modules != NULL) {
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int i;
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/* Explicitly erase all modules; this is the safest way
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to get rid of at least *some* circular dependencies */
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for (i = getdictsize(modules); --i >= 0; ) {
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object *k;
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k = getdict2key(modules, i);
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if (k != NULL) {
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object *m;
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m = dict2lookup(modules, k);
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if (m == NULL)
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err_clear();
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else if (is_moduleobject(m)) {
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object *d;
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d = getmoduledict(m);
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if (d != NULL && is_dictobject(d)) {
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cleardict(d);
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}
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}
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}
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}
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cleardict(modules);
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}
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DECREF(modules);
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}
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/* Initialize built-in modules when first imported */
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extern struct {
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char *name;
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void (*initfunc)();
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} inittab[];
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static int
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init_builtin(name)
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char *name;
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{
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int i;
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for (i = 0; inittab[i].name != NULL; i++) {
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if (strcmp(name, inittab[i].name) == 0) {
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(*inittab[i].initfunc)();
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return 1;
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}
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}
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return 0;
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}
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