libguile/init.c

   1 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45
  46 /* Everybody has an init function.  */
  47 #include "alist.h"
  48 #include "append.h"
  49 #include "arbiters.h"
  50 #include "async.h"
  51 #include "backtrace.h"
  52 #include "boolean.h"
  53 #include "chars.h"
  54 #include "continuations.h"
  55 #ifdef DEBUG_EXTENSIONS
  56 #include "debug.h"
  57 #endif
  58 #include "dynwind.h"
  59 #include "eq.h"
  60 #include "error.h"
  61 #include "eval.h"
  62 #include "fdsocket.h"
  63 #include "feature.h"
  64 #include "filesys.h"
  65 #include "fports.h"
  66 #include "gc.h"
  67 #include "gdbint.h"
  68 #include "gsubr.h"
  69 #include "hash.h"
  70 #include "hashtab.h"
  71 #include "ioext.h"
  72 #include "kw.h"
  73 #include "list.h"
  74 #include "load.h"
  75 #include "mallocs.h"
  76 #include "mbstrings.h"
  77 #include "numbers.h"
  78 #include "objprop.h"
  79 #include "options.h"
  80 #include "pairs.h"
  81 #include "ports.h"
  82 #include "posix.h"
  83 #include "print.h"
  84 #include "procprop.h"
  85 #include "procs.h"
  86 #include "ramap.h"
  87 #include "read.h"
  88 #include "scmsigs.h"
  89 #include "sequences.h"
  90 #include "simpos.h"
  91 #include "smob.h"
  92 #include "socket.h"
  93 #include "srcprop.h"
  94 #include "stackchk.h"
  95 #include "stacks.h"
  96 #include "stime.h"
  97 #include "strings.h"
  98 #include "strop.h"
  99 #include "strorder.h"
 100 #include "strports.h"
 101 #include "struct.h"
 102 #include "symbols.h"
 103 #include "tag.h"
 104 #include "throw.h"
 105 #include "unif.h"
 106 #include "variable.h"
 107 #include "vectors.h"
 108 #include "version.h"
 109 #include "vports.h"
 110 #include "weaks.h"
 111
 112 #include "init.h"
 113
 114 #ifdef HAVE_STRING_H
 115 #include <string.h>
 116 #endif
 117 #ifdef HAVE_UNISTD_H
 118 #include <unistd.h>
 119 #endif
 120 \f
 121
 122 static void scm_start_stack SCM_P ((void *base));
 123 static void scm_restart_stack SCM_P ((void * base));
 124
 125 static void
 126 scm_start_stack (base)
 127      void * base;
 128 {
 129   SCM root;
 130
 131   root = scm_permanent_object (scm_make_root (SCM_UNDEFINED));
 132   scm_set_root (SCM_ROOT_STATE (root));
 133   scm_stack_base = base;
 134
 135   scm_exitval = SCM_BOOL_F;     /* vestigial */
 136
 137   scm_top_level_lookup_thunk_var = SCM_BOOL_F;
 138   scm_system_transformer = SCM_BOOL_F;
 139
 140   /* Create an object to hold the root continuation.
 141    */
 142   SCM_NEWCELL (scm_rootcont);
 143   SCM_SETJMPBUF (scm_rootcont, scm_must_malloc ((long) sizeof (scm_contregs),
 144                                                 "continuation"));
 145   SCM_SETCAR (scm_rootcont, scm_tc7_contin);
 146   SCM_SEQ (scm_rootcont) = 0;
 147   /* The root continuation if further initialized by scm_restart_stack. */
 148
 149   /* Create the look-aside stack for variables that are shared between
 150    * captured continuations.
 151    */
 152   scm_continuation_stack = scm_make_vector (SCM_MAKINUM (512),
 153                                             SCM_UNDEFINED, SCM_UNDEFINED);
 154   /* The continuation stack is further initialized by scm_restart_stack. */
 155
 156   /* The remainder of stack initialization is factored out to another
 157    * function so that if this stack is ever exitted, it can be
 158    * re-entered using scm_restart_stack.  */
 159   scm_restart_stack (base);
 160 }
 161
 162
 163 static void
 164 scm_restart_stack (base)
 165      void * base;
 166 {
 167   scm_dynwinds = SCM_EOL;
 168   SCM_DYNENV (scm_rootcont) = SCM_EOL;
 169   SCM_THROW_VALUE (scm_rootcont) = SCM_EOL;
 170 #ifdef DEBUG_EXTENSIONS
 171   SCM_DFRAME (scm_rootcont) = scm_last_debug_frame = 0;
 172 #endif
 173   SCM_BASE (scm_rootcont) = base;
 174   scm_continuation_stack_ptr = SCM_MAKINUM (0);
 175 }
 176
 177 #if 0
 178 static char remsg[] = "remove\n#define ", addmsg[] = "add\n#define ";
 179
 180
 181 static void fixconfig SCM_P ((char *s1, char *s2, int s));
 182
 183 static void
 184 fixconfig (s1, s2, s)
 185      char *s1;
 186      char *s2;
 187      int s;
 188 {
 189   fputs (s1, stderr);
 190   fputs (s2, stderr);
 191   fputs ("\nin ", stderr);
 192   fputs (s ? "setjump" : "scmfig", stderr);
 193   fputs (".h and recompile scm\n", stderr);
 194   exit (1);
 195 }
 196
 197
 198 static void check_config SCM_P ((void));
 199
 200 static void
 201 check_config ()
 202 {
 203   scm_sizet j;
 204
 205   j = HEAP_SEG_SIZE;
 206   if (HEAP_SEG_SIZE != j)
 207     fixconfig ("reduce", "size of HEAP_SEG_SIZE", 0);
 208
 209 #ifdef SCM_SINGLES
 210   if (sizeof (float) != sizeof (long))
 211       fixconfig (remsg, "SCM_SINGLES", 0);
 212 #endif /* def SCM_SINGLES */
 213
 214
 215 #ifdef SCM_BIGDIG
 216   if (2 * SCM_BITSPERDIG / SCM_CHAR_BIT > sizeof (long))
 217       fixconfig (remsg, "SCM_BIGDIG", 0);
 218 #ifndef SCM_DIGSTOOBIG
 219   if (SCM_DIGSPERLONG * sizeof (SCM_BIGDIG) > sizeof (long))
 220       fixconfig (addmsg, "SCM_DIGSTOOBIG", 0);
 221 #endif
 222 #endif
 223
 224 #ifdef SCM_STACK_GROWS_UP
 225   if (((SCM_STACKITEM *) & j - stack_start_ptr) < 0)
 226     fixconfig (remsg, "SCM_STACK_GROWS_UP", 1);
 227 #else
 228   if ((stack_start_ptr - (SCM_STACKITEM *) & j) < 0)
 229     fixconfig (addmsg, "SCM_STACK_GROWS_UP", 1);
 230 #endif
 231 }
 232 #endif
 233
 234
 235 \f
 236 /* initializing standard and current I/O ports */
 237
 238 /* Create standard ports from stdio stdin, stdout, and stderr.  */
 239 static void
 240 scm_init_standard_ports ()
 241 {
 242   /* I'm not sure why this should be unbuffered when coming from a
 243      tty; isn't line buffering more common?  */
 244   scm_def_inp = scm_stdio_to_port (stdin,
 245                                    (isatty (fileno (stdin)) ? "r0" : "r"),
 246                                    "standard input");
 247   scm_def_outp = scm_stdio_to_port (stdout, "w", "standard output");
 248   scm_def_errp = scm_stdio_to_port (stderr, "w", "standard error");
 249
 250   scm_cur_inp = scm_def_inp;
 251   scm_cur_outp = scm_def_outp;
 252   scm_cur_errp = scm_def_errp;
 253 }
 254
 255
 256 \f
 257 #ifdef _UNICOS
 258 typedef int setjmp_type;
 259 #else
 260 typedef long setjmp_type;
 261 #endif
 262
 263 static void scm_boot_guile_1 SCM_P ((SCM_STACKITEM *base,
 264                                      int argc, char **argv,
 265                                      void (*main_func) (void *closure,
 266                                                         int argc,
 267                                                         char **argv),
 268                                      void *closure));
 269
 270
 271 /* Fire up the Guile Scheme interpreter.
 272
 273    Call MAIN_FUNC, passing it CLOSURE, ARGC, and ARGV.  MAIN_FUNC
 274    should do all the work of the program (initializing other packages,
 275    reading user input, etc.) before returning.  When MAIN_FUNC
 276    returns, call exit (0); this function never returns.  If you want
 277    some other exit value, MAIN_FUNC may call exit itself.
 278
 279    scm_boot_guile arranges for program-arguments to return the strings
 280    given by ARGC and ARGV.  If MAIN_FUNC modifies ARGC/ARGV, should
 281    call scm_set_program_arguments with the final list, so Scheme code
 282    will know which arguments have been processed.
 283
 284    Why must the caller do all the real work from MAIN_FUNC?  The
 285    garbage collector assumes that all local variables of type SCM will
 286    be above scm_boot_guile's stack frame on the stack.  If you try to
 287    manipulate SCM values after this function returns, it's the luck of
 288    the draw whether the GC will be able to find the objects you
 289    allocate.  So, scm_boot_guile function exits, rather than
 290    returning, to discourage people from making that mistake.  */
 291
 292
 293 void
 294 scm_boot_guile (argc, argv, main_func, closure)
 295      int argc;
 296      char ** argv;
 297      void (*main_func) ();
 298      void *closure;
 299 {
 300   /* The garbage collector uses the address of this variable as one
 301      end of the stack, and the address of one of its own local
 302      variables as the other end.  */
 303   SCM_STACKITEM dummy;
 304
 305   return scm_boot_guile_1 (&dummy, argc, argv, main_func, closure);
 306 }
 307
 308
 309 static void
 310 scm_boot_guile_1 (base, argc, argv, main_func, closure)
 311      SCM_STACKITEM *base;
 312      int argc;
 313      char **argv;
 314      void (*main_func) ();
 315      void *closure;
 316 {
 317   static int initialized = 0;
 318   static int live = 0;
 319   setjmp_type setjmp_val;
 320
 321   /* This function is not re-entrant. */
 322   if (live)
 323     abort ();
 324
 325   live = 1;
 326
 327   scm_ints_disabled = 1;
 328   scm_block_gc = 1;
 329
 330   if (initialized)
 331     {
 332       scm_restart_stack (base);
 333     }
 334   else
 335     {
 336       scm_ports_prehistory ();
 337       scm_smob_prehistory ();
 338       scm_tables_prehistory ();
 339       scm_init_storage (0);
 340       scm_init_root ();
 341 #ifdef USE_THREADS
 342       scm_init_threads (base);
 343 #endif
 344       scm_start_stack (base);
 345       scm_init_gsubr ();
 346       scm_init_feature ();
 347       scm_init_alist ();
 348       scm_init_append ();
 349       scm_init_arbiters ();
 350       scm_init_async ();
 351       scm_init_backtrace ();
 352       scm_init_boolean ();
 353       scm_init_chars ();
 354       scm_init_continuations ();
 355       scm_init_dynwind ();
 356       scm_init_eq ();
 357       scm_init_error ();
 358       scm_init_fdsocket ();
 359       scm_init_fports ();
 360       scm_init_filesys ();
 361       scm_init_gc ();
 362       scm_init_gdbint ();
 363       scm_init_hash ();
 364       scm_init_hashtab ();
 365       scm_init_ioext ();
 366       scm_init_kw ();
 367       scm_init_list ();
 368       scm_init_mallocs ();
 369       scm_init_numbers ();
 370       scm_init_objprop ();
 371 #if DEBUG_EXTENSIONS
 372       /* Excluding this until it's really needed makes the binary
 373        * smaller after linking.  */
 374       scm_init_options ();
 375 #endif
 376       scm_init_pairs ();
 377       scm_init_ports ();
 378       scm_init_posix ();
 379       scm_init_procs ();
 380       scm_init_procprop ();
 381       scm_init_scmsigs ();
 382       scm_init_socket ();
 383 #ifdef DEBUG_EXTENSIONS
 384       scm_init_srcprop ();
 385 #endif
 386       scm_init_stackchk ();
 387       scm_init_struct ();       /* Requires struct */
 388       scm_init_stacks ();
 389       scm_init_strports ();
 390       scm_init_symbols ();
 391       scm_init_tag ();
 392       scm_init_load ();
 393       scm_init_print ();        /* Requires struct */
 394       scm_init_read ();
 395       scm_init_sequences ();
 396       scm_init_stime ();
 397       scm_init_strings ();
 398       scm_init_strorder ();
 399       scm_init_mbstrings ();
 400       scm_init_strop ();
 401       scm_init_throw ();
 402       scm_init_variable ();
 403       scm_init_vectors ();
 404       scm_init_version ();
 405       scm_init_weaks ();
 406       scm_init_vports ();
 407       scm_init_eval ();
 408 #ifdef DEBUG_EXTENSIONS
 409       scm_init_debug ();        /* Requires macro smobs */
 410 #endif
 411       scm_init_ramap ();
 412       scm_init_unif ();
 413       scm_init_simpos ();
 414       scm_init_load_path ();
 415       scm_init_standard_ports ();
 416       initialized = 1;
 417     }
 418
 419   scm_block_gc = 0;             /* permit the gc to run */
 420   /* ints still disabled */
 421
 422 #ifdef STACK_CHECKING
 423   scm_stack_checking_enabled_p = SCM_STACK_CHECKING_P;
 424 #endif
 425
 426   setjmp_val = setjmp (SCM_JMPBUF (scm_rootcont));
 427   if (!setjmp_val)
 428     {
 429       scm_init_signals ();
 430
 431       scm_set_program_arguments (argc, argv, 0);
 432       (*main_func) (closure, argc, argv);
 433     }
 434
 435   scm_restore_signals ();
 436
 437   /* This tick gives any pending
 438    * asyncs a chance to run.  This must be done after
 439    * the call to scm_restore_signals.
 440    */
 441   SCM_ASYNC_TICK;
 442
 443   /* If the caller doesn't want this, they should return from
 444      main_func themselves.  */
 445   exit (0);
 446 }