mirror of
https://github.com/python/cpython
synced 2024-11-05 18:12:54 +00:00
5b7221849e
f_fastlocals in a traceback object (this is a core dump hazard if there are <nil> entries), but instead eval_code() merges the fast locals back into the locals dictionary if it looks like the local variables will be retained. Also, the merge routines save exceptions since this is sometimes needed (alas!). * Added id() to bltinmodule.c, which returns an object's address (identity). Useful to walk arbitrary data structures containing cycles. * Added compile() to bltinmodule.c and compile_string() to pythonrun.[ch]: support to exec/eval arbitrary code objects. The code that defaults globals and locals is moved from run_node in pythonrun.c (which is now identical to eval_node) to eval_code in ceval.c. [XXX For elegance a clean-up session is necessary.]
515 lines
9.3 KiB
C
515 lines
9.3 KiB
C
/***********************************************************
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Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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Amsterdam, The 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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/* Python interpreter top-level routines, including init/exit */
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#include "allobjects.h"
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#include "grammar.h"
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#include "node.h"
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#include "parsetok.h"
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#include "graminit.h"
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#include "errcode.h"
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#include "sysmodule.h"
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#include "compile.h"
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#include "eval.h"
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#include "ceval.h"
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#include "pythonrun.h"
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#include "import.h"
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#ifdef unix
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#define HANDLE_SIGNALS
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#endif
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#ifdef HANDLE_SIGNALS
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#include <signal.h>
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#include "sigtype.h"
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#endif
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extern char *getpythonpath();
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extern grammar gram; /* From graminit.c */
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void initsigs(); /* Forward */
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int debugging; /* Needed by parser.c */
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int verbose; /* Needed by import.c */
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/* Initialize all */
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void
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initall()
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{
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static int inited;
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if (inited)
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return;
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inited = 1;
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initimport();
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/* Modules 'builtin' and 'sys' are initialized here,
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they are needed by random bits of the interpreter.
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All other modules are optional and are initialized
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when they are first imported. */
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initbuiltin(); /* Also initializes builtin exceptions */
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initsys();
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initcalls(); /* Configuration-dependent initializations */
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setpythonpath(getpythonpath());
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initsigs(); /* Signal handling stuff, including initintr() */
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}
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/* Parse input from a file and execute it */
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int
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run(fp, filename)
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FILE *fp;
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char *filename;
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{
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if (filename == NULL)
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filename = "???";
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if (isatty((int)fileno(fp)))
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return run_tty_loop(fp, filename);
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else
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return run_script(fp, filename);
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}
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int
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run_tty_loop(fp, filename)
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FILE *fp;
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char *filename;
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{
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object *v;
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int ret;
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v = sysget("ps1");
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if (v == NULL) {
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sysset("ps1", v = newstringobject(">>> "));
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XDECREF(v);
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}
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v = sysget("ps2");
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if (v == NULL) {
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sysset("ps2", v = newstringobject("... "));
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XDECREF(v);
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}
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for (;;) {
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ret = run_tty_1(fp, filename);
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#ifdef REF_DEBUG
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fprintf(stderr, "[%ld refs]\n", ref_total);
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#endif
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if (ret == E_EOF)
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return 0;
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/*
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if (ret == E_NOMEM)
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return -1;
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*/
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}
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}
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int
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run_tty_1(fp, filename)
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FILE *fp;
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char *filename;
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{
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object *m, *d, *v, *w;
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node *n;
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char *ps1, *ps2;
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int err;
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v = sysget("ps1");
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w = sysget("ps2");
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if (v != NULL && is_stringobject(v)) {
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INCREF(v);
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ps1 = getstringvalue(v);
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}
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else {
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v = NULL;
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ps1 = "";
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}
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if (w != NULL && is_stringobject(w)) {
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INCREF(w);
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ps2 = getstringvalue(w);
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}
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else {
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w = NULL;
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ps2 = "";
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}
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BGN_SAVE
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err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n);
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END_SAVE
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XDECREF(v);
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XDECREF(w);
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if (err == E_EOF)
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return E_EOF;
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if (err != E_DONE) {
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err_input(err);
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print_error();
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return err;
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}
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m = add_module("__main__");
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if (m == NULL)
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return -1;
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d = getmoduledict(m);
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v = run_node(n, filename, d, d);
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flushline();
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if (v == NULL) {
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print_error();
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return -1;
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}
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DECREF(v);
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return 0;
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}
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int
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run_script(fp, filename)
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FILE *fp;
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char *filename;
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{
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object *m, *d, *v;
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m = add_module("__main__");
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if (m == NULL)
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return -1;
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d = getmoduledict(m);
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v = run_file(fp, filename, file_input, d, d);
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flushline();
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if (v == NULL) {
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print_error();
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return -1;
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}
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DECREF(v);
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return 0;
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}
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int
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run_command(command)
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char *command;
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{
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object *m, *d, *v;
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m = add_module("__main__");
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if (m == NULL)
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return -1;
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d = getmoduledict(m);
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v = run_string(command, file_input, d, d);
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flushline();
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if (v == NULL) {
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print_error();
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return -1;
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}
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DECREF(v);
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return 0;
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}
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void
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print_error()
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{
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object *exception, *v, *f;
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err_get(&exception, &v);
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if (exception == SystemExit) {
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if (v == NULL || v == None)
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goaway(0);
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if (is_intobject(v))
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goaway((int)getintvalue(v));
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else {
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/* OK to use real stderr here */
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printobject(v, stderr, PRINT_RAW);
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fprintf(stderr, "\n");
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goaway(1);
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}
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}
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sysset("last_type", exception);
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sysset("last_value", v);
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f = sysget("stderr");
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if (f == NULL)
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fprintf(stderr, "lost sys.stderr\n");
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else {
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if (writeobject(exception, f, PRINT_RAW) != 0)
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err_clear();
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if (v != NULL && v != None) {
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writestring(": ", f);
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if (writeobject(v, f, PRINT_RAW) != 0)
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err_clear();
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}
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writestring("\n", f);
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printtraceback(f);
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}
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XDECREF(exception);
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XDECREF(v);
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}
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object *
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run_string(str, start, globals, locals)
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char *str;
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int start;
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object *globals, *locals;
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{
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node *n;
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int err;
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err = parse_string(str, start, &n);
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return run_err_node(err, n, "<string>", globals, locals);
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}
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object *
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run_file(fp, filename, start, globals, locals)
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FILE *fp;
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char *filename;
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int start;
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object *globals, *locals;
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{
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node *n;
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int err;
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err = parse_file(fp, filename, start, &n);
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return run_err_node(err, n, filename, globals, locals);
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}
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object *
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run_err_node(err, n, filename, globals, locals)
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int err;
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node *n;
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char *filename;
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object *globals, *locals;
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{
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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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return run_node(n, filename, globals, locals);
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}
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object *
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run_node(n, filename, globals, locals)
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node *n;
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char *filename;
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object *globals, *locals;
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{
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return eval_node(n, filename, globals, locals);
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}
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object *
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eval_node(n, filename, globals, locals)
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node *n;
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char *filename;
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object *globals;
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object *locals;
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{
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codeobject *co;
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object *v;
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co = compile(n, filename);
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freetree(n);
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if (co == NULL)
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return NULL;
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v = eval_code(co, globals, locals, (object *)NULL);
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DECREF(co);
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return v;
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}
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object *
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compile_string(str, filename, start)
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char *str;
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char *filename;
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int start;
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{
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node *n;
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int err;
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codeobject *co;
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err = parse_string(str, start, &n);
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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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co = compile(n, filename);
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freetree(n);
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return (object *)co;
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}
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/* Simplified interface to parsefile */
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int
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parse_file(fp, filename, start, n_ret)
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FILE *fp;
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char *filename;
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int start;
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node **n_ret;
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{
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int ret;
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BGN_SAVE
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ret = parsefile(fp, filename, &gram, start,
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(char *)0, (char *)0, n_ret);
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END_SAVE
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return ret;
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}
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/* Simplified interface to parsestring */
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int
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parse_string(str, start, n_ret)
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char *str;
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int start;
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node **n_ret;
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{
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int err = parsestring(str, &gram, start, n_ret);
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/* Don't confuse early end of string with early end of input */
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if (err == E_EOF)
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err = E_SYNTAX;
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return err;
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}
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/* Print fatal error message and abort */
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void
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fatal(msg)
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char *msg;
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{
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fprintf(stderr, "Fatal error: %s\n", msg);
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abort();
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}
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/* Clean up and exit */
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#ifdef USE_THREAD
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extern int threads_started;
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#endif
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void
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cleanup()
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{
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object *exitfunc = sysget("exitfunc");
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if (exitfunc) {
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object *arg;
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object *res;
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sysset("exitfunc", (object *)NULL);
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arg = newtupleobject(0);
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if (arg == NULL)
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res = NULL;
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else {
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res = call_object(exitfunc, arg);
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DECREF(arg);
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}
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if (res == NULL) {
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fprintf(stderr, "Error in sys.exitfunc:\n");
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print_error();
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}
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}
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flushline();
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}
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void
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goaway(sts)
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int sts;
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{
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cleanup();
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#ifdef USE_THREAD
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/* Other threads may still be active, so skip most of the
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cleanup actions usually done (these are mostly for
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debugging anyway). */
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(void) save_thread();
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donecalls();
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if (threads_started)
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_exit_prog(sts);
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else
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exit_prog(sts);
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#else /* USE_THREAD */
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/* XXX Call doneimport() before donecalls(), since donecalls()
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calls wdone(), and doneimport() may close windows */
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doneimport();
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donecalls();
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err_clear();
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#ifdef REF_DEBUG
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fprintf(stderr, "[%ld refs]\n", ref_total);
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#endif
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#ifdef TRACE_REFS
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if (askyesno("Print left references?")) {
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printrefs(stderr);
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}
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#endif /* TRACE_REFS */
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exit(sts);
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#endif /* USE_THREAD */
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/*NOTREACHED*/
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}
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#ifdef HANDLE_SIGNALS
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SIGTYPE
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sighandler(sig)
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int sig;
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{
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signal(sig, SIG_DFL); /* Don't catch recursive signals */
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cleanup(); /* Do essential clean-up */
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kill(getpid(), sig); /* Pretend the signal killed us */
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/*NOTREACHED*/
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}
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#endif
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void
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initsigs()
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{
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initintr();
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#ifdef HANDLE_SIGNALS
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if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
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signal(SIGHUP, sighandler);
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if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
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signal(SIGTERM, sighandler);
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#endif
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}
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#ifdef TRACE_REFS
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/* Ask a yes/no question */
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int
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askyesno(prompt)
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char *prompt;
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{
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char buf[256];
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printf("%s [ny] ", prompt);
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if (fgets(buf, sizeof buf, stdin) == NULL)
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return 0;
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return buf[0] == 'y' || buf[0] == 'Y';
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}
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#endif
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#ifdef applec /* MPW (also usable for Think C 3.0) */
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/* Check for file descriptor connected to interactive device.
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Pretend that stdin is always interactive, other files never. */
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int
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isatty(fd)
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int fd;
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{
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return fd == fileno(stdin);
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}
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#endif
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