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cpython/Python/pythonrun.c

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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.
******************************************************************/
/* Python interpreter top-level routines, including init/exit */
#include "allobjects.h"
#include "grammar.h"
#include "node.h"
#include "parsetok.h"
#include "graminit.h"
#undef argument /* Avoid conflict on Mac */
#include "errcode.h"
#include "sysmodule.h"
#include "bltinmodule.h"
#include "compile.h"
#include "eval.h"
#include "ceval.h"
#include "import.h"
#include "marshal.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef MS_WIN32
#undef BYTE
#undef arglist
#include "windows.h"
#endif
extern char *getpythonpath();
extern grammar gram; /* From graminit.c */
/* Forward */
static void initmain PROTO((void));
static object *run_err_node PROTO((node *n, char *filename,
object *globals, object *locals));
static object *run_node PROTO((node *n, char *filename,
object *globals, object *locals));
static object *run_pyc_file PROTO((FILE *fp, char *filename,
object *globals, object *locals));
static void err_input PROTO((perrdetail *));
static void initsigs PROTO((void));
int debugging; /* Needed by parser.c */
int verbose; /* Needed by import.c */
int suppress_print; /* Needed by ceval.c */
int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */
/* Initialize all */
void
initall()
{
static int inited;
if (inited)
return;
inited = 1;
initimport();
/* Modules '__builtin__' and 'sys' are initialized here,
they are needed by random bits of the interpreter.
All other modules are optional and are initialized
when they are first imported. */
initbuiltin(); /* Also initializes builtin exceptions */
initsys();
setpythonpath(getpythonpath());
initsigs(); /* Signal handling stuff, including initintr() */
initmain();
}
/* Create __main__ module */
static void
initmain()
{
object *m, *d;
m = add_module("__main__");
if (m == NULL)
fatal("can't create __main__ module");
d = getmoduledict(m);
if (dictlookup(d, "__builtins__") == NULL) {
if (dictinsert(d, "__builtins__", getbuiltins()))
fatal("can't add __builtins__ to __main__");
}
}
/* Parse input from a file and execute it */
int
run(fp, filename)
FILE *fp;
char *filename;
{
if (filename == NULL)
filename = "???";
if (Py_FdIsInteractive(fp, filename))
return run_tty_loop(fp, filename);
else
return run_script(fp, filename);
}
int
run_tty_loop(fp, filename)
FILE *fp;
char *filename;
{
object *v;
int ret;
v = sysget("ps1");
if (v == NULL) {
sysset("ps1", v = newstringobject(">>> "));
XDECREF(v);
}
v = sysget("ps2");
if (v == NULL) {
sysset("ps2", v = newstringobject("... "));
XDECREF(v);
}
for (;;) {
ret = run_tty_1(fp, filename);
#ifdef Py_REF_DEBUG
fprintf(stderr, "[%ld refs]\n", _Py_RefTotal);
#endif
if (ret == E_EOF)
return 0;
/*
if (ret == E_NOMEM)
return -1;
*/
}
}
int
run_tty_1(fp, filename)
FILE *fp;
char *filename;
{
object *m, *d, *v, *w;
node *n;
perrdetail err;
char *ps1, *ps2;
v = sysget("ps1");
w = sysget("ps2");
if (v != NULL && is_stringobject(v)) {
INCREF(v);
ps1 = getstringvalue(v);
}
else {
v = NULL;
ps1 = "";
}
if (w != NULL && is_stringobject(w)) {
INCREF(w);
ps2 = getstringvalue(w);
}
else {
w = NULL;
ps2 = "";
}
BGN_SAVE
n = parsefile(fp, filename, &gram, single_input, ps1, ps2, &err);
END_SAVE
XDECREF(v);
XDECREF(w);
if (n == NULL) {
if (err.error == E_EOF) {
if (err.text)
free(err.text);
return E_EOF;
}
err_input(&err);
print_error();
return err.error;
}
m = add_module("__main__");
if (m == NULL)
return -1;
d = getmoduledict(m);
v = run_node(n, filename, d, d);
if (v == NULL) {
print_error();
return -1;
}
DECREF(v);
flushline();
return 0;
}
int
run_script(fp, filename)
FILE *fp;
char *filename;
{
object *m, *d, *v;
char *ext;
m = add_module("__main__");
if (m == NULL)
return -1;
d = getmoduledict(m);
ext = filename + strlen(filename) - 4;
#ifdef macintosh
/* On a mac, we also assume a pyc file for types 'PYC ' and 'APPL' */
if ( strcmp(ext, ".pyc") == 0 || getfiletype(filename) == 'PYC ' ||
getfiletype(filename) == 'APPL' ) {
#else
if ( strcmp(ext, ".pyc") == 0 ) {
#endif /* macintosh */
/* Try to run a pyc file. First, re-open in binary */
/* Don't close, done in main: fclose(fp); */
if( (fp = fopen(filename, "rb")) == NULL ) {
fprintf(stderr, "python: Can't reopen .pyc file\n");
return -1;
}
v = run_pyc_file(fp, filename, d, d);
} else {
v = run_file(fp, filename, file_input, d, d);
}
if (v == NULL) {
print_error();
return -1;
}
DECREF(v);
flushline();
return 0;
}
int
run_command(command)
char *command;
{
object *m, *d, *v;
m = add_module("__main__");
if (m == NULL)
return -1;
d = getmoduledict(m);
v = run_string(command, file_input, d, d);
if (v == NULL) {
print_error();
return -1;
}
DECREF(v);
flushline();
return 0;
}
void
print_error()
{
object *exception, *v, *tb, *f;
err_fetch(&exception, &v, &tb);
flushline();
fflush(stdout);
if (exception == NULL)
fatal("print_error called but no exception");
if (exception == SystemExit) {
if (v == NULL || v == None)
goaway(0);
if (is_intobject(v))
goaway((int)getintvalue(v));
else {
/* OK to use real stderr here */
printobject(v, stderr, PRINT_RAW);
fprintf(stderr, "\n");
goaway(1);
}
}
sysset("last_type", exception);
sysset("last_value", v);
sysset("last_traceback", tb);
f = sysget("stderr");
if (f == NULL)
fprintf(stderr, "lost sys.stderr\n");
else {
tb_print(tb, f);
if (exception == SyntaxError) {
object *message;
char *filename, *text;
int lineno, offset;
if (!getargs(v, "(O(ziiz))", &message,
&filename, &lineno, &offset, &text))
err_clear();
else {
char buf[10];
writestring(" File \"", f);
if (filename == NULL)
writestring("<string>", f);
else
writestring(filename, f);
writestring("\", line ", f);
sprintf(buf, "%d", lineno);
writestring(buf, f);
writestring("\n", f);
if (text != NULL) {
char *nl;
if (offset > 0 &&
offset == strlen(text))
offset--;
for (;;) {
nl = strchr(text, '\n');
if (nl == NULL ||
nl-text >= offset)
break;
offset -= (nl+1-text);
text = nl+1;
}
while (*text == ' ' || *text == '\t') {
text++;
offset--;
}
writestring(" ", f);
writestring(text, f);
if (*text == '\0' ||
text[strlen(text)-1] != '\n')
writestring("\n", f);
writestring(" ", f);
offset--;
while (offset > 0) {
writestring(" ", f);
offset--;
}
writestring("^\n", f);
}
INCREF(message);
DECREF(v);
v = message;
}
}
if (is_classobject(exception)) {
object* className = ((classobject*)exception)->cl_name;
if (className == NULL)
writestring("<unknown>", f);
else {
if (writeobject(className, f, PRINT_RAW) != 0)
err_clear();
}
} else {
if (writeobject(exception, f, PRINT_RAW) != 0)
err_clear();
}
if (v != NULL && v != None) {
writestring(": ", f);
if (writeobject(v, f, PRINT_RAW) != 0)
err_clear();
}
writestring("\n", f);
}
XDECREF(exception);
XDECREF(v);
XDECREF(tb);
}
object *
run_string(str, start, globals, locals)
char *str;
int start;
object *globals, *locals;
{
return run_err_node(parse_string(str, start),
"<string>", globals, locals);
}
object *
run_file(fp, filename, start, globals, locals)
FILE *fp;
char *filename;
int start;
object *globals, *locals;
{
return run_err_node(parse_file(fp, filename, start),
filename, globals, locals);
}
static object *
run_err_node(n, filename, globals, locals)
node *n;
char *filename;
object *globals, *locals;
{
if (n == NULL)
return NULL;
return run_node(n, filename, globals, locals);
}
static object *
run_node(n, filename, globals, locals)
node *n;
char *filename;
object *globals, *locals;
{
codeobject *co;
object *v;
co = compile(n, filename);
freetree(n);
if (co == NULL)
return NULL;
v = eval_code(co, globals, locals);
DECREF(co);
return v;
}
static object *
run_pyc_file(fp, filename, globals, locals)
FILE *fp;
char *filename;
object *globals, *locals;
{
codeobject *co;
object *v;
long magic;
long get_pyc_magic();
magic = rd_long(fp);
if (magic != get_pyc_magic()) {
err_setstr(RuntimeError,
"Bad magic number in .pyc file");
return NULL;
}
(void) rd_long(fp);
v = rd_object(fp);
fclose(fp);
if (v == NULL || !is_codeobject(v)) {
XDECREF(v);
err_setstr(RuntimeError,
"Bad code object in .pyc file");
return NULL;
}
co = (codeobject *)v;
v = eval_code(co, globals, locals);
DECREF(co);
return v;
}
object *
compile_string(str, filename, start)
char *str;
char *filename;
int start;
{
node *n;
codeobject *co;
n = parse_string(str, start);
if (n == NULL)
return NULL;
co = compile(n, filename);
freetree(n);
return (object *)co;
}
/* Simplified interface to parsefile -- return node or set exception */
node *
parse_file(fp, filename, start)
FILE *fp;
char *filename;
int start;
{
node *n;
perrdetail err;
BGN_SAVE
n = parsefile(fp, filename, &gram, start,
(char *)0, (char *)0, &err);
END_SAVE
if (n == NULL)
err_input(&err);
return n;
}
/* Simplified interface to parsestring -- return node or set exception */
node *
parse_string(str, start)
char *str;
int start;
{
node *n;
perrdetail err;
n = parsestring(str, &gram, start, &err);
if (n == NULL)
err_input(&err);
return n;
}
/* Set the error appropriate to the given input error code (see errcode.h) */
static void
err_input(err)
perrdetail *err;
{
object *v, *w;
char *msg = NULL;
v = mkvalue("(ziiz)", err->filename,
err->lineno, err->offset, err->text);
if (err->text != NULL) {
free(err->text);
err->text = NULL;
}
switch (err->error) {
case E_SYNTAX:
msg = "invalid syntax";
break;
case E_TOKEN:
msg = "invalid token";
break;
case E_INTR:
err_set(KeyboardInterrupt);
return;
case E_NOMEM:
err_nomem();
return;
case E_EOF:
msg = "unexpected EOF while parsing";
break;
default:
fprintf(stderr, "error=%d\n", err->error);
msg = "unknown parsing error";
break;
}
w = mkvalue("(sO)", msg, v);
XDECREF(v);
err_setval(SyntaxError, w);
XDECREF(w);
}
/* Print fatal error message and abort */
void
fatal(msg)
char *msg;
{
fprintf(stderr, "Fatal Python error: %s\n", msg);
#ifdef macintosh
for (;;);
#endif
#ifdef MS_WIN32
OutputDebugString("Fatal Python error:");
OutputDebugString(msg);
OutputDebugString("\n");
#endif
abort();
}
/* Clean up and exit */
#ifdef WITH_THREAD
#include "thread.h"
int threads_started = 0; /* Set by threadmodule.c and maybe others */
#endif
#define NEXITFUNCS 32
static void (*exitfuncs[NEXITFUNCS])();
static int nexitfuncs = 0;
int Py_AtExit(func)
void (*func) PROTO((void));
{
if (nexitfuncs >= NEXITFUNCS)
return -1;
exitfuncs[nexitfuncs++] = func;
return 0;
}
void
cleanup()
{
object *exitfunc = sysget("exitfunc");
if (exitfunc) {
object *res;
INCREF(exitfunc);
sysset("exitfunc", (object *)NULL);
res = call_object(exitfunc, (object *)NULL);
if (res == NULL) {
fprintf(stderr, "Error in sys.exitfunc:\n");
print_error();
}
DECREF(exitfunc);
}
flushline();
while (nexitfuncs > 0)
(*exitfuncs[--nexitfuncs])();
}
#ifdef COUNT_ALLOCS
extern void dump_counts PROTO((void));
#endif
void
goaway(sts)
int sts;
{
cleanup();
#ifdef COUNT_ALLOCS
dump_counts();
#endif
#ifdef WITH_THREAD
/* Other threads may still be active, so skip most of the
cleanup actions usually done (these are mostly for
debugging anyway). */
(void) save_thread();
#ifndef NO_EXIT_PROG
if (threads_started)
_exit_prog(sts);
else
exit_prog(sts);
#else /* !NO_EXIT_PROG */
if (threads_started)
_exit(sts);
else
exit(sts);
#endif /* !NO_EXIT_PROG */
#else /* WITH_THREAD */
doneimport();
err_clear();
#ifdef Py_REF_DEBUG
fprintf(stderr, "[%ld refs]\n", _Py_RefTotal);
#endif
#ifdef Py_TRACE_REFS
if (askyesno("Print left references?")) {
_Py_PrintReferences(stderr);
}
#endif /* Py_TRACE_REFS */
#ifdef macintosh
PyMac_Exit(sts);
#else
exit(sts);
#endif
#endif /* WITH_THREAD */
/*NOTREACHED*/
}
#ifdef HAVE_SIGNAL_H
static RETSIGTYPE
sighandler(sig)
int sig;
{
signal(sig, SIG_DFL); /* Don't catch recursive signals */
cleanup(); /* Do essential clean-up */
#ifdef HAVE_GETPID
kill(getpid(), sig); /* Pretend the signal killed us */
#else
exit(1);
#endif
/*NOTREACHED*/
}
#endif
static void
initsigs()
{
RETSIGTYPE (*t)();
#ifdef HAVE_SIGNAL_H
#ifdef SIGPIPE
signal(SIGPIPE, SIG_IGN);
#endif
#ifdef SIGHUP
t = signal(SIGHUP, SIG_IGN);
if (t == SIG_DFL)
signal(SIGHUP, sighandler);
else
signal(SIGHUP, t);
#endif
#ifdef SIGTERM
t = signal(SIGTERM, SIG_IGN);
if (t == SIG_DFL)
signal(SIGTERM, sighandler);
else
signal(SIGTERM, t);
#endif
#endif /* HAVE_SIGNAL_H */
initintr(); /* May imply initsignal() */
}
#ifdef Py_TRACE_REFS
/* Ask a yes/no question */
int
askyesno(prompt)
char *prompt;
{
char buf[256];
printf("%s [ny] ", prompt);
if (fgets(buf, sizeof buf, stdin) == NULL)
return 0;
return buf[0] == 'y' || buf[0] == 'Y';
}
#endif
#ifdef MPW
/* Check for file descriptor connected to interactive device.
Pretend that stdin is always interactive, other files never. */
int
isatty(fd)
int fd;
{
return fd == fileno(stdin);
}
#endif
/*
* The file descriptor fd is considered ``interactive'' if either
* a) isatty(fd) is TRUE, or
* b) the -i flag was given, and the filename associated with
* the descriptor is NULL or "<stdin>" or "???".
*/
int
Py_FdIsInteractive(fp, filename)
FILE *fp;
char *filename;
{
if (isatty((int)fileno(fp)))
return 1;
if (!Py_InteractiveFlag)
return 0;
return (filename == NULL) ||
(strcmp(filename, "<stdin>") == 0) ||
(strcmp(filename, "???") == 0);
}
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