libguile/debug.c

   1  /* Debugging extensions for Guile
   2  * Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this software; see the file COPYING.  If not, write to
  16  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  17  * Boston, MA 02111-1307 USA
  18  *
  19  * As a special exception, the Free Software Foundation gives permission
  20  * for additional uses of the text contained in its release of GUILE.
  21  *
  22  * The exception is that, if you link the GUILE library with other files
  23  * to produce an executable, this does not by itself cause the
  24  * resulting executable to be covered by the GNU General Public License.
  25  * Your use of that executable is in no way restricted on account of
  26  * linking the GUILE library code into it.
  27  *
  28  * This exception does not however invalidate any other reasons why
  29  * the executable file might be covered by the GNU General Public License.
  30  *
  31  * This exception applies only to the code released by the
  32  * Free Software Foundation under the name GUILE.  If you copy
  33  * code from other Free Software Foundation releases into a copy of
  34  * GUILE, as the General Public License permits, the exception does
  35  * not apply to the code that you add in this way.  To avoid misleading
  36  * anyone as to the status of such modified files, you must delete
  37  * this exception notice from them.
  38  *
  39  * If you write modifications of your own for GUILE, it is your choice
  40  * whether to permit this exception to apply to your modifications.
  41  * If you do not wish that, delete this exception notice.
  42  *
  43  * The author can be reached at djurfeldt@nada.kth.se
  44  * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */
  45
  46 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  47    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  48
  49
  50 #include <stdio.h>
  51 #include "_scm.h"
  52 #include "eval.h"
  53 #include "stackchk.h"
  54 #include "throw.h"
  55 #include "genio.h"
  56 #include "macros.h"
  57 #include "smob.h"
  58 #include "procprop.h"
  59 #include "srcprop.h"
  60 #include "alist.h"
  61 #include "continuations.h"
  62 #include "strports.h"
  63 #include "read.h"
  64 #include "feature.h"
  65 #include "dynwind.h"
  66 #include "modules.h"
  67
  68 #include "scm_validate.h"
  69 #include "debug.h"
  70 \f
  71
  72 /* {Run time control of the debugging evaluator}
  73  */
  74
  75 GUILE_PROC (scm_debug_options, "debug-options-interface", 0, 1, 0,
  76             (SCM setting),
  77 "")
  78 #define FUNC_NAME s_scm_debug_options
  79 {
  80   SCM ans;
  81   SCM_DEFER_INTS;
  82   ans = scm_options (setting,
  83                      scm_debug_opts,
  84                      SCM_N_DEBUG_OPTIONS,
  85                      FUNC_NAME);
  86 #ifndef SCM_RECKLESS
  87   if (!(1 <= SCM_N_FRAMES && SCM_N_FRAMES <= SCM_MAX_FRAME_SIZE))
  88     {
  89       scm_options (ans, scm_debug_opts, SCM_N_DEBUG_OPTIONS, FUNC_NAME);
  90       scm_out_of_range (FUNC_NAME, setting);
  91     }
  92 #endif
  93   SCM_RESET_DEBUG_MODE;
  94   scm_stack_checking_enabled_p = SCM_STACK_CHECKING_P;
  95   scm_debug_eframe_size = 2 * SCM_N_FRAMES;
  96   SCM_ALLOW_INTS;
  97   return ans;
  98 }
  99 #undef FUNC_NAME
 100
 101 static void
 102 with_traps_before (void *data)
 103 {
 104   int *trap_flag = data;
 105   *trap_flag = SCM_TRAPS_P;
 106   SCM_TRAPS_P = 1;
 107 }
 108
 109 static void
 110 with_traps_after (void *data)
 111 {
 112   int *trap_flag = data;
 113   SCM_TRAPS_P = *trap_flag;
 114 }
 115
 116 static SCM
 117 with_traps_inner (void *data)
 118 {
 119   SCM thunk = (SCM) data;
 120   return scm_apply (thunk, SCM_EOL, SCM_EOL);
 121 }
 122
 123 GUILE_PROC (scm_with_traps, "with-traps", 1, 0, 0,
 124             (SCM thunk),
 125 "")
 126 #define FUNC_NAME s_scm_with_traps
 127 {
 128   int trap_flag;
 129   SCM_VALIDATE_THUNK(1,thunk);
 130   return scm_internal_dynamic_wind (with_traps_before,
 131                                     with_traps_inner,
 132                                     with_traps_after,
 133                                     (void *) thunk,
 134                                     &trap_flag);
 135 }
 136 #undef FUNC_NAME
 137
 138 \f
 139 static SCM scm_sym_source, scm_sym_dots;
 140 static SCM scm_sym_procname;
 141
 142 /* {Memoized Source}
 143  */
 144
 145 long scm_tc16_memoized;
 146
 147
 148 static int
 149 prinmemoized (SCM obj,SCM port,scm_print_state *pstate)
 150 {
 151   int writingp = SCM_WRITINGP (pstate);
 152   scm_puts ("#<memoized ", port);
 153   SCM_SET_WRITINGP (pstate, 1);
 154 #ifdef GUILE_DEBUG
 155   scm_iprin1 (SCM_MEMOIZED_EXP (obj), port, pstate);
 156 #else
 157   scm_iprin1 (scm_unmemoize (obj), port, pstate);
 158 #endif
 159   SCM_SET_WRITINGP (pstate, writingp);
 160   scm_putc ('>', port);
 161   return 1;
 162 }
 163
 164 GUILE_PROC (scm_memoized_p, "memoized?", 1, 0, 0,
 165             (SCM obj),
 166 "")
 167 #define FUNC_NAME s_scm_memoized_p
 168 {
 169   return SCM_BOOL(SCM_MEMOIZEDP (obj));
 170 }
 171 #undef FUNC_NAME
 172
 173 SCM
 174 scm_make_memoized (SCM exp, SCM env)
 175 {
 176   /* *fixme* Check that env is a valid environment. */
 177   register SCM z, ans;
 178   SCM_ENTER_A_SECTION;
 179   SCM_NEWSMOB (z, exp, env);
 180   SCM_NEWSMOB (ans, scm_tc16_memoized, z);
 181   SCM_EXIT_A_SECTION;
 182   return ans;
 183 }
 184
 185 #ifdef GUILE_DEBUG
 186 /*
 187  * Some primitives for construction of memoized code
 188  *
 189  * - procedure: memcons CAR CDR [ENV]
 190  *
 191  *     Construct a pair, encapsulated in a memoized object.
 192  *
 193  *     The CAR and CDR can be either normal or memoized.  If ENV isn't
 194  *     specified, the top-level environment of the current module will
 195  *     be assumed.  All environments must match.
 196  *
 197  * - procedure: make-gloc VARIABLE [ENV]
 198  *
 199  *     Return a gloc, encapsulated in a memoized object.
 200  *
 201  *     (Glocs can't exist in normal list structures, since they will
 202  *     be mistaken for structs.)
 203  *
 204  * - procedure: gloc? OBJECT
 205  *
 206  *     Return #t if OBJECT is a memoized gloc.
 207  *
 208  * - procedure: make-iloc FRAME BINDING CDRP
 209  *
 210  *     Return an iloc referring to frame no. FRAME, binding
 211  *     no. BINDING.  If CDRP is non-#f, the iloc is referring to a
 212  *     frame consisting of a single pair, with the value stored in the
 213  *     CDR.
 214  *
 215  * - procedure: iloc? OBJECT
 216  *
 217  *     Return #t if OBJECT is an iloc.
 218  *
 219  * - procedure: mem->proc MEMOIZED
 220  *
 221  *     Construct a closure from the memoized lambda expression MEMOIZED
 222  *
 223  *     WARNING! The code is not copied!
 224  *
 225  * - procedure: proc->mem CLOSURE
 226  *
 227  *     Turn the closure CLOSURE into a memoized object.
 228  *
 229  *     WARNING! The code is not copied!
 230  *
 231  * - constant: SCM_IM_AND
 232  * - constant: SCM_IM_BEGIN
 233  * - constant: SCM_IM_CASE
 234  * - constant: SCM_IM_COND
 235  * - constant: SCM_IM_DO
 236  * - constant: SCM_IM_IF
 237  * - constant: SCM_IM_LAMBDA
 238  * - constant: SCM_IM_LET
 239  * - constant: SCM_IM_LETSTAR
 240  * - constant: SCM_IM_LETREC
 241  * - constant: SCM_IM_OR
 242  * - constant: SCM_IM_QUOTE
 243  * - constant: SCM_IM_SET
 244  * - constant: SCM_IM_DEFINE
 245  * - constant: SCM_IM_APPLY
 246  * - constant: SCM_IM_CONT
 247  * - constant: SCM_IM_DISPATCH
 248  */
 249
 250 #include "variable.h"
 251 #include "procs.h"
 252
 253 GUILE_PROC (scm_make_gloc, "make-gloc", 1, 1, 0,
 254             (SCM var, SCM env),
 255 "")
 256 #define FUNC_NAME s_scm_make_gloc
 257 {
 258 #if 1 /* Unsafe */
 259   if (SCM_CONSP (var))
 260     var = scm_cons (SCM_BOOL_F, var);
 261   else
 262 #endif
 263     SCM_VALIDATE_VARIABLE(1,var);
 264   if (SCM_UNBNDP (env))
 265     env = scm_top_level_env (SCM_CDR (scm_top_level_lookup_closure_var));
 266   else
 267     SCM_VALIDATE_NULLORCONS(2,env);
 268   return scm_make_memoized (SCM_VARVCELL (var) + 1, env);
 269 }
 270 #undef FUNC_NAME
 271
 272 GUILE_PROC (scm_gloc_p, "gloc?", 1, 0, 0,
 273             (SCM obj),
 274 "")
 275 #define FUNC_NAME s_scm_gloc_p
 276 {
 277   return SCM_BOOL((SCM_NIMP (obj)
 278                    && SCM_MEMOIZEDP (obj)
 279                    && (SCM_MEMOIZED_EXP (obj) & 7) == 1));
 280 }
 281 #undef FUNC_NAME
 282
 283 GUILE_PROC (scm_make_iloc, "make-iloc", 3, 0, 0,
 284             (SCM frame, SCM binding, SCM cdrp),
 285 "")
 286 #define FUNC_NAME s_scm_make_iloc
 287 {
 288   SCM_VALIDATE_INT(1,frame);
 289   SCM_VALIDATE_INT(2,binding);
 290   return (SCM_ILOC00
 291           + SCM_IFRINC * SCM_INUM (frame)
 292           + (SCM_NFALSEP (cdrp) ? SCM_ICDR : 0)
 293           + SCM_IDINC * SCM_INUM (binding));
 294 }
 295 #undef FUNC_NAME
 296
 297 GUILE_PROC (scm_iloc_p, "iloc?", 1, 0, 0,
 298           (SCM obj),
 299 "")
 300 #define FUNC_NAME s_scm_iGUILE_p
 301 {
 302   return SCM_BOOL(SCM_ILOCP (obj));
 303 }
 304 #undef FUNC_NAME
 305
 306 GUILE_PROC (scm_memcons, "memcons", 2, 1, 0,
 307             (SCM car, SCM cdr, SCM env),
 308 "")
 309 #define FUNC_NAME s_scm_memcons
 310 {
 311   if (SCM_MEMOIZEDP (car))
 312     {
 313       /*fixme* environments may be two different but equal top-level envs */
 314       if (!SCM_UNBNDP (env) && SCM_MEMOIZED_ENV (car) != env)
 315         SCM_MISC_ERROR ("environment mismatch arg1 <-> arg3",
 316                         scm_cons2 (car, env, SCM_EOL));
 317       else
 318         env = SCM_MEMOIZED_ENV (car);
 319       car = SCM_MEMOIZED_EXP (car);
 320     }
 321   if (SCM_MEMOIZEDP (cdr))
 322     {
 323       if (!SCM_UNBNDP (env) && SCM_MEMOIZED_ENV (cdr) != env)
 324         SCM_MISC_ERROR ("environment mismatch arg2 <-> arg3",
 325                         scm_cons2 (cdr, env, SCM_EOL));
 326       else
 327         env = SCM_MEMOIZED_ENV (cdr);
 328       cdr = SCM_MEMOIZED_EXP (cdr);
 329     }
 330   if (SCM_UNBNDP (env))
 331     env = scm_top_level_env (SCM_CDR (scm_top_level_lookup_closure_var));
 332   else
 333     SCM_VALIDATE_NULLORCONS(3,env);
 334   return scm_make_memoized (scm_cons (car, cdr), env);
 335 }
 336 #undef FUNC_NAME
 337
 338 GUILE_PROC (scm_mem_to_proc, "mem->proc", 1, 0, 0,
 339             (SCM obj),
 340 "")
 341 #define FUNC_NAME s_scm_mem_to_proc
 342 {
 343   SCM env;
 344   SCM_VALIDATE_MEMOIZED(1,obj);
 345   env = SCM_MEMOIZED_ENV (obj);
 346   obj = SCM_MEMOIZED_EXP (obj);
 347   if (!(SCM_NIMP (obj) && SCM_CAR (obj) == SCM_IM_LAMBDA))
 348     SCM_MISC_ERROR ("expected lambda expression",
 349                     scm_cons (obj, SCM_EOL));
 350   return scm_closure (SCM_CDR (obj), env);
 351 }
 352 #undef FUNC_NAME
 353
 354 GUILE_PROC (scm_proc_to_mem, "proc->mem", 1, 0, 0,
 355             (SCM obj),
 356 "")
 357 #define FUNC_NAME s_scm_proc_to_mem
 358 {
 359   SCM_VALIDATE_CLOSURE (1, obj);
 360   return scm_make_memoized (scm_cons (SCM_IM_LAMBDA, SCM_CODE (obj)),
 361                             SCM_ENV (obj));
 362 }
 363 #undef FUNC_NAME
 364
 365 #endif /* GUILE_DEBUG */
 366
 367 GUILE_PROC (scm_unmemoize, "unmemoize", 1, 0, 0,
 368             (SCM m),
 369 "")
 370 #define FUNC_NAME s_scm_unmemoize
 371 {
 372   SCM_VALIDATE_MEMOIZED(1,m);
 373   return scm_unmemocopy (SCM_MEMOIZED_EXP (m), SCM_MEMOIZED_ENV (m));
 374 }
 375 #undef FUNC_NAME
 376
 377 GUILE_PROC (scm_memoized_environment, "memoized-environment", 1, 0, 0,
 378             (SCM m),
 379 "")
 380 #define FUNC_NAME s_scm_memoized_environment
 381 {
 382   SCM_VALIDATE_MEMOIZED(1,m);
 383   return SCM_MEMOIZED_ENV (m);
 384 }
 385 #undef FUNC_NAME
 386
 387 GUILE_PROC (scm_procedure_name, "procedure-name", 1, 0, 0,
 388             (SCM proc),
 389 "")
 390 #define FUNC_NAME s_scm_procedure_name
 391 {
 392   SCM_VALIDATE_PROC(1,proc);
 393   switch (SCM_TYP7 (proc)) {
 394   case scm_tcs_subrs:
 395     return SCM_SNAME (proc);
 396   default:
 397     {
 398       SCM name = scm_procedure_property (proc, scm_sym_name);
 399 #if 0
 400       /* Source property scm_sym_procname not implemented yet... */
 401       SCM name = scm_source_property (SCM_CAR (SCM_CDR (SCM_CODE (proc))), scm_sym_procname);
 402       if (SCM_FALSEP (name))
 403         name = scm_procedure_property (proc, scm_sym_name);
 404 #endif
 405       if (SCM_FALSEP (name) && SCM_CLOSUREP (proc))
 406         name = scm_reverse_lookup (SCM_ENV (proc), proc);
 407       return name;
 408     }
 409   }
 410 }
 411 #undef FUNC_NAME
 412
 413 GUILE_PROC (scm_procedure_source, "procedure-source", 1, 0, 0,
 414             (SCM proc),
 415 "")
 416 #define FUNC_NAME s_scm_procedure_source
 417 {
 418   SCM_VALIDATE_NIM (1,proc);
 419   switch (SCM_TYP7 (proc)) {
 420   case scm_tcs_closures:
 421     {
 422       SCM src;
 423       src = scm_source_property (SCM_CDR (SCM_CODE (proc)), scm_sym_copy);
 424       if (src != SCM_BOOL_F)
 425         return scm_cons2 (scm_sym_lambda, SCM_CAR (SCM_CODE (proc)), src);
 426       src = SCM_CODE (proc);
 427       return scm_cons (scm_sym_lambda,
 428                        scm_unmemocopy (src,
 429                                        SCM_EXTEND_ENV (SCM_CAR (src),
 430                                                            SCM_EOL,
 431                                                            SCM_ENV (proc))));
 432     }
 433   case scm_tc7_contin:
 434   case scm_tcs_subrs:
 435 #ifdef CCLO
 436   case scm_tc7_cclo:
 437 #endif
 438     /* It would indeed be a nice thing if we supplied source even for
 439        built in procedures! */
 440     return scm_procedure_property (proc, scm_sym_source);
 441   default:
 442     SCM_WTA(1,proc);
 443     return 0;
 444   }
 445 }
 446 #undef FUNC_NAME
 447
 448 GUILE_PROC (scm_procedure_environment, "procedure-environment", 1, 0, 0,
 449             (SCM proc),
 450 "")
 451 #define FUNC_NAME s_scm_procedure_environment
 452 {
 453   SCM_VALIDATE_NIM (1,proc);
 454   switch (SCM_TYP7 (proc)) {
 455   case scm_tcs_closures:
 456     return SCM_ENV (proc);
 457   case scm_tc7_contin:
 458   case scm_tcs_subrs:
 459 #ifdef CCLO
 460   case scm_tc7_cclo:
 461 #endif
 462     return SCM_EOL;
 463   default:
 464     SCM_WTA(1,proc);
 465     return 0;
 466   }
 467 }
 468 #undef FUNC_NAME
 469
 470 \f
 471
 472 /* Eval in a local environment.  We would like to have the ability to
 473  * evaluate in a specified local environment, but due to the
 474  * memoization this isn't normally possible.  We solve it by copying
 475  * the code before evaluating.  One solution would be to have eval.c
 476  * generate yet another evaluator.  They are not very big actually.
 477  */
 478 GUILE_PROC (scm_local_eval, "local-eval", 1, 1, 0,
 479             (SCM exp, SCM env),
 480 "Evaluate @var{exp} in its environment.  If @var{env} is supplied,
 481 it is the environment in which to evaluate @var{exp}.  Otherwise,
 482 @var{exp} must be a memoized code object (in which case, its environment
 483 is implicit).")
 484 #define FUNC_NAME s_scm_local_eval
 485 {
 486   if (SCM_UNBNDP (env))
 487   {
 488     SCM_VALIDATE_MEMOIZED(1,exp);
 489     return scm_eval_3 (SCM_MEMOIZED_EXP (exp), 0, SCM_MEMOIZED_ENV (exp));
 490   }
 491   return scm_eval_3 (exp, 1, env);
 492 }
 493 #undef FUNC_NAME
 494
 495 #if 0
 496 SCM_REGISTER_PROC (s_reverse_lookup, "reverse-lookup", 2, 0, 0, scm_reverse_lookup);
 497 #endif
 498
 499 SCM
 500 scm_reverse_lookup (SCM env, SCM data)
 501 {
 502   SCM names, values;
 503   while (SCM_CONSP (SCM_CAR (env)))
 504     {
 505       names = SCM_CAAR (env);
 506       values = SCM_CDAR (env);
 507       while (SCM_CONSP (names))
 508         {
 509           if (SCM_CAR (values) == data)
 510             return SCM_CAR (names);
 511           names = SCM_CDR (names);
 512           values = SCM_CDR (values);
 513         }
 514       if (names != SCM_EOL && values == data)
 515         return names;
 516       env = SCM_CDR (env);
 517     }
 518   return SCM_BOOL_F;
 519 }
 520
 521 SCM
 522 scm_start_stack (SCM id, SCM exp, SCM env)
 523 {
 524   SCM answer;
 525   scm_debug_frame vframe;
 526   scm_debug_info vframe_vect_body;
 527   vframe.prev = scm_last_debug_frame;
 528   vframe.status = SCM_VOIDFRAME;
 529   vframe.vect = &vframe_vect_body;
 530   vframe.vect[0].id = id;
 531   scm_last_debug_frame = &vframe;
 532   answer = scm_eval_3 (exp, 1, env);
 533   scm_last_debug_frame = vframe.prev;
 534   return answer;
 535 }
 536
 537 SCM_SYNTAX(s_start_stack, "start-stack", scm_makacro, scm_m_start_stack);
 538
 539 static SCM
 540 scm_m_start_stack (SCM exp, SCM env)
 541 {
 542   exp = SCM_CDR (exp);
 543   SCM_ASSERT (SCM_NIMP (exp)
 544               && SCM_ECONSP (exp)
 545               && SCM_NIMP (SCM_CDR (exp))
 546               && SCM_ECONSP (SCM_CDR (exp))
 547               && SCM_NULLP (SCM_CDDR (exp)),
 548               exp,
 549               SCM_WNA,
 550               s_start_stack);
 551   return scm_start_stack (scm_eval_car (exp, env), SCM_CADR (exp), env);
 552 }
 553
 554 /* {Debug Objects}
 555  *
 556  * The debugging evaluator throws these on frame traps.
 557  */
 558
 559 long scm_tc16_debugobj;
 560
 561 static int
 562 prindebugobj (SCM obj,SCM port,scm_print_state *pstate)
 563 {
 564   scm_puts ("#<debug-object ", port);
 565   scm_intprint (SCM_DEBUGOBJ_FRAME (obj), 16, port);
 566   scm_putc ('>', port);
 567   return 1;
 568 }
 569
 570 GUILE_PROC (scm_debug_object_p, "debug-object?", 1, 0, 0,
 571             (SCM obj),
 572 "")
 573 #define FUNC_NAME s_scm_debug_object_p
 574 {
 575   return SCM_BOOL(SCM_DEBUGOBJP (obj));
 576 }
 577 #undef FUNC_NAME
 578
 579
 580 SCM
 581 scm_make_debugobj (scm_debug_frame *frame)
 582 {
 583   register SCM z;
 584   SCM_NEWCELL (z);
 585   SCM_ENTER_A_SECTION;
 586   SCM_SET_DEBUGOBJ_FRAME (z, (SCM) frame);
 587   SCM_SETCAR (z, scm_tc16_debugobj);
 588   SCM_EXIT_A_SECTION;
 589   return z;
 590 }
 591
 592 \f
 593
 594 /* Undocumented debugging procedure */
 595 #ifdef GUILE_DEBUG
 596 GUILE_PROC (scm_debug_hang, "debug-hang", 0, 1, 0,
 597             (SCM obj),
 598 "")
 599 #define FUNC_NAME s_scm_debug_hang
 600 {
 601   int go = 0;
 602   while (!go) ;
 603   return SCM_UNSPECIFIED;
 604 }
 605 #undef FUNC_NAME
 606 #endif
 607
 608 \f
 609
 610 void
 611 scm_init_debug ()
 612 {
 613   scm_init_opts (scm_debug_options, scm_debug_opts, SCM_N_DEBUG_OPTIONS);
 614
 615   scm_tc16_memoized = scm_make_smob_type_mfpe ("memoized", 0,
 616                                               scm_markcdr, NULL, prinmemoized, NULL);
 617
 618   scm_tc16_debugobj = scm_make_smob_type_mfpe ("debug-object", 0,
 619                                               NULL, NULL, prindebugobj, NULL);
 620
 621   scm_sym_procname = SCM_CAR (scm_sysintern ("procname", SCM_UNDEFINED));
 622   scm_sym_dots = SCM_CAR (scm_sysintern ("...", SCM_UNDEFINED));
 623   scm_sym_source = SCM_CAR (scm_sysintern ("source", SCM_UNDEFINED));
 624
 625 #ifdef GUILE_DEBUG
 626   scm_sysintern ("SCM_IM_AND", SCM_IM_AND);
 627   scm_sysintern ("SCM_IM_BEGIN", SCM_IM_BEGIN);
 628   scm_sysintern ("SCM_IM_CASE", SCM_IM_CASE);
 629   scm_sysintern ("SCM_IM_COND", SCM_IM_COND);
 630   scm_sysintern ("SCM_IM_DO", SCM_IM_DO);
 631   scm_sysintern ("SCM_IM_IF", SCM_IM_IF);
 632   scm_sysintern ("SCM_IM_LAMBDA", SCM_IM_LAMBDA);
 633   scm_sysintern ("SCM_IM_LET", SCM_IM_LET);
 634   scm_sysintern ("SCM_IM_LETSTAR", SCM_IM_LETSTAR);
 635   scm_sysintern ("SCM_IM_LETREC", SCM_IM_LETREC);
 636   scm_sysintern ("SCM_IM_OR", SCM_IM_OR);
 637   scm_sysintern ("SCM_IM_QUOTE", SCM_IM_QUOTE);
 638   scm_sysintern ("SCM_IM_SET_X", SCM_IM_SET_X);
 639   scm_sysintern ("SCM_IM_DEFINE", SCM_IM_DEFINE);
 640   scm_sysintern ("SCM_IM_APPLY", SCM_IM_APPLY);
 641   scm_sysintern ("SCM_IM_CONT", SCM_IM_CONT);
 642   scm_sysintern ("SCM_IM_DISPATCH", SCM_IM_DISPATCH);
 643 #endif
 644   scm_add_feature ("debug-extensions");
 645
 646 #include "debug.x"
 647 }