gdb/scm-valprint.c

   1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
   2
   3    Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2005, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "symtab.h"
  23 #include "gdbtypes.h"
  24 #include "expression.h"
  25 #include "parser-defs.h"
  26 #include "language.h"
  27 #include "value.h"
  28 #include "scm-lang.h"
  29 #include "valprint.h"
  30 #include "gdbcore.h"
  31 #include "c-lang.h"
  32 #include "infcall.h"
  33
  34 static void scm_ipruk (char *, LONGEST, struct ui_file *);
  35 static void scm_scmlist_print (LONGEST, struct ui_file *, int, int,
  36                                int, enum val_prettyprint);
  37 static int scm_inferior_print (LONGEST, struct ui_file *, int, int,
  38                                int, enum val_prettyprint);
  39
  40 /* Prints the SCM value VALUE by invoking the inferior, if appropraite.
  41    Returns >= 0 on success;  return -1 if the inferior cannot/should not
  42    print VALUE. */
  43
  44 static int
  45 scm_inferior_print (LONGEST value, struct ui_file *stream, int format,
  46                     int deref_ref, int recurse, enum val_prettyprint pretty)
  47 {
  48   struct value *func, *arg, *result;
  49   struct symbol *gdb_output_sym, *gdb_output_len_sym;
  50   char *output;
  51   int ret, output_len;
  52
  53   func = find_function_in_inferior ("gdb_print");
  54   arg = value_from_longest (builtin_type_CORE_ADDR, value);
  55
  56   result = call_function_by_hand (func, 1, &arg);
  57   ret = (int) value_as_long (result);
  58   if (ret == 0)
  59     {
  60       /* XXX: Should we cache these symbols?  */
  61       gdb_output_sym =
  62         lookup_symbol_global ("gdb_output", NULL, NULL, VAR_DOMAIN);
  63       gdb_output_len_sym =
  64         lookup_symbol_global ("gdb_output_length", NULL, NULL, VAR_DOMAIN);
  65
  66       if ((gdb_output_sym == NULL) || (gdb_output_len_sym == NULL))
  67         ret = -1;
  68       else
  69         {
  70           struct value *remote_buffer;
  71
  72           read_memory (SYMBOL_VALUE_ADDRESS (gdb_output_len_sym),
  73                        (char *) &output_len, sizeof (output_len));
  74
  75           output = (char *) alloca (output_len);
  76           remote_buffer = value_at (builtin_type_CORE_ADDR,
  77                                     SYMBOL_VALUE_ADDRESS (gdb_output_sym));
  78           read_memory (value_as_address (remote_buffer),
  79                        output, output_len);
  80
  81           ui_file_write (stream, output, output_len);
  82         }
  83     }
  84
  85   return ret;
  86 }
  87
  88 /* {Names of immediate symbols}
  89  * This table must agree with the declarations in scm.h: {Immediate Symbols}.*/
  90
  91 static char *scm_isymnames[] =
  92 {
  93   /* This table must agree with the declarations */
  94   "and",
  95   "begin",
  96   "case",
  97   "cond",
  98   "do",
  99   "if",
 100   "lambda",
 101   "let",
 102   "let*",
 103   "letrec",
 104   "or",
 105   "quote",
 106   "set!",
 107   "define",
 108 #if 0
 109   "literal-variable-ref",
 110   "literal-variable-set!",
 111 #endif
 112   "apply",
 113   "call-with-current-continuation",
 114
 115  /* user visible ISYMS */
 116  /* other keywords */
 117  /* Flags */
 118
 119   "#f",
 120   "#t",
 121   "#<undefined>",
 122   "#<eof>",
 123   "()",
 124   "#<unspecified>"
 125 };
 126
 127 static void
 128 scm_scmlist_print (LONGEST svalue, struct ui_file *stream, int format,
 129                    int deref_ref, int recurse, enum val_prettyprint pretty)
 130 {
 131   unsigned int more = print_max;
 132   if (recurse > 6)
 133     {
 134       fputs_filtered ("...", stream);
 135       return;
 136     }
 137   scm_scmval_print (SCM_CAR (svalue), stream, format,
 138                     deref_ref, recurse + 1, pretty);
 139   svalue = SCM_CDR (svalue);
 140   for (; SCM_NIMP (svalue); svalue = SCM_CDR (svalue))
 141     {
 142       if (SCM_NECONSP (svalue))
 143         break;
 144       fputs_filtered (" ", stream);
 145       if (--more == 0)
 146         {
 147           fputs_filtered ("...", stream);
 148           return;
 149         }
 150       scm_scmval_print (SCM_CAR (svalue), stream, format,
 151                         deref_ref, recurse + 1, pretty);
 152     }
 153   if (SCM_NNULLP (svalue))
 154     {
 155       fputs_filtered (" . ", stream);
 156       scm_scmval_print (svalue, stream, format,
 157                         deref_ref, recurse + 1, pretty);
 158     }
 159 }
 160
 161 static void
 162 scm_ipruk (char *hdr, LONGEST ptr, struct ui_file *stream)
 163 {
 164   fprintf_filtered (stream, "#<unknown-%s", hdr);
 165 #define SCM_SIZE TYPE_LENGTH (builtin_type_scm)
 166   if (SCM_CELLP (ptr))
 167     fprintf_filtered (stream, " (0x%lx . 0x%lx) @",
 168                       (long) SCM_CAR (ptr), (long) SCM_CDR (ptr));
 169   fprintf_filtered (stream, " 0x%s>", paddr_nz (ptr));
 170 }
 171
 172 void
 173 scm_scmval_print (LONGEST svalue, struct ui_file *stream, int format,
 174                   int deref_ref, int recurse, enum val_prettyprint pretty)
 175 {
 176 taloop:
 177   switch (7 & (int) svalue)
 178     {
 179     case 2:
 180     case 6:
 181       print_longest (stream, format ? format : 'd', 1, svalue >> 2);
 182       break;
 183     case 4:
 184       if (SCM_ICHRP (svalue))
 185         {
 186           svalue = SCM_ICHR (svalue);
 187           scm_printchar (svalue, stream);
 188           break;
 189         }
 190       else if (SCM_IFLAGP (svalue)
 191                && (SCM_ISYMNUM (svalue)
 192                    < (sizeof scm_isymnames / sizeof (char *))))
 193         {
 194           fputs_filtered (SCM_ISYMCHARS (svalue), stream);
 195           break;
 196         }
 197       else if (SCM_ILOCP (svalue))
 198         {
 199           fprintf_filtered (stream, "#@%ld%c%ld",
 200                             (long) SCM_IFRAME (svalue),
 201                             SCM_ICDRP (svalue) ? '-' : '+',
 202                             (long) SCM_IDIST (svalue));
 203           break;
 204         }
 205       else
 206         goto idef;
 207       break;
 208     case 1:
 209       /* gloc */
 210       svalue = SCM_CAR (svalue - 1);
 211       goto taloop;
 212     default:
 213     idef:
 214       scm_ipruk ("immediate", svalue, stream);
 215       break;
 216     case 0:
 217
 218       switch (SCM_TYP7 (svalue))
 219         {
 220         case scm_tcs_cons_gloc:
 221           if (SCM_CDR (SCM_CAR (svalue) - 1L) == 0)
 222             {
 223 #if 0
 224               SCM name;
 225 #endif
 226               fputs_filtered ("#<latte ", stream);
 227 #if 1
 228               fputs_filtered ("???", stream);
 229 #else
 230               name = ((SCM n *) (STRUCT_TYPE (exp)))[struct_i_name];
 231               scm_lfwrite (CHARS (name),
 232                            (sizet) sizeof (char),
 233                              (sizet) LENGTH (name),
 234                            port);
 235 #endif
 236               fprintf_filtered (stream, " #X%s>", paddr_nz (svalue));
 237               break;
 238             }
 239         case scm_tcs_cons_imcar:
 240         case scm_tcs_cons_nimcar:
 241           fputs_filtered ("(", stream);
 242           scm_scmlist_print (svalue, stream, format,
 243                              deref_ref, recurse + 1, pretty);
 244           fputs_filtered (")", stream);
 245           break;
 246         case scm_tcs_closures:
 247           fputs_filtered ("#<CLOSURE ", stream);
 248           scm_scmlist_print (SCM_CODE (svalue), stream, format,
 249                              deref_ref, recurse + 1, pretty);
 250           fputs_filtered (">", stream);
 251           break;
 252         case scm_tc7_string:
 253           {
 254             int len = SCM_LENGTH (svalue);
 255             CORE_ADDR addr = (CORE_ADDR) SCM_CDR (svalue);
 256             int i;
 257             int done = 0;
 258             int buf_size;
 259             gdb_byte buffer[64];
 260             int truncate = print_max && len > (int) print_max;
 261             if (truncate)
 262               len = print_max;
 263             fputs_filtered ("\"", stream);
 264             for (; done < len; done += buf_size)
 265               {
 266                 buf_size = min (len - done, 64);
 267                 read_memory (addr + done, buffer, buf_size);
 268
 269                 for (i = 0; i < buf_size; ++i)
 270                   switch (buffer[i])
 271                     {
 272                     case '\"':
 273                     case '\\':
 274                       fputs_filtered ("\\", stream);
 275                     default:
 276                       fprintf_filtered (stream, "%c", buffer[i]);
 277                     }
 278               }
 279             fputs_filtered (truncate ? "...\"" : "\"", stream);
 280             break;
 281           }
 282           break;
 283         case scm_tcs_symbols:
 284           {
 285             int len = SCM_LENGTH (svalue);
 286
 287             char *str = alloca (len);
 288             read_memory (SCM_CDR (svalue), (gdb_byte *) str, len + 1);
 289             /* Should handle weird characters FIXME */
 290             str[len] = '\0';
 291             fputs_filtered (str, stream);
 292             break;
 293           }
 294         case scm_tc7_vector:
 295           {
 296             int len = SCM_LENGTH (svalue);
 297             int i;
 298             LONGEST elements = SCM_CDR (svalue);
 299             fputs_filtered ("#(", stream);
 300             for (i = 0; i < len; ++i)
 301               {
 302                 if (i > 0)
 303                   fputs_filtered (" ", stream);
 304                 scm_scmval_print (scm_get_field (elements, i), stream, format,
 305                                   deref_ref, recurse + 1, pretty);
 306               }
 307             fputs_filtered (")", stream);
 308           }
 309           break;
 310 #if 0
 311         case tc7_lvector:
 312           {
 313             SCM result;
 314             SCM hook;
 315             hook = scm_get_lvector_hook (exp, LV_PRINT_FN);
 316             if (hook == BOOL_F)
 317               {
 318                 scm_puts ("#<locked-vector ", port);
 319                 scm_intprint (CDR (exp), 16, port);
 320                 scm_puts (">", port);
 321               }
 322             else
 323               {
 324                 result
 325                   = scm_apply (hook,
 326                                scm_listify (exp, port,
 327                                             (writing ? BOOL_T : BOOL_F),
 328                                             SCM_UNDEFINED),
 329                                EOL);
 330                 if (result == BOOL_F)
 331                   goto punk;
 332               }
 333             break;
 334           }
 335           break;
 336         case tc7_bvect:
 337         case tc7_ivect:
 338         case tc7_uvect:
 339         case tc7_fvect:
 340         case tc7_dvect:
 341         case tc7_cvect:
 342           scm_raprin1 (exp, port, writing);
 343           break;
 344 #endif
 345         case scm_tcs_subrs:
 346           {
 347             int index = SCM_CAR (svalue) >> 8;
 348 #if 1
 349             char str[20];
 350             sprintf (str, "#%d", index);
 351 #else
 352             char *str = index ? SCM_CHARS (scm_heap_org + index) : "";
 353 #define SCM_CHARS(x) ((char *)(SCM_CDR(x)))
 354             char *str = CHARS (SNAME (exp));
 355 #endif
 356             fprintf_filtered (stream, "#<primitive-procedure %s>",
 357                               str);
 358           }
 359           break;
 360 #if 0
 361 #ifdef CCLO
 362         case tc7_cclo:
 363           scm_puts ("#<compiled-closure ", port);
 364           scm_iprin1 (CCLO_SUBR (exp), port, writing);
 365           scm_putc ('>', port);
 366           break;
 367 #endif
 368         case tc7_contin:
 369           fprintf_filtered (stream, "#<continuation %d @ #X%lx >",
 370                             LENGTH (svalue),
 371                             (long) CHARS (svalue));
 372           break;
 373         case tc7_port:
 374           i = PTOBNUM (exp);
 375           if (i < scm_numptob
 376               && scm_ptobs[i].print
 377               && (scm_ptobs[i].print) (exp, port, writing))
 378             break;
 379           goto punk;
 380         case tc7_smob:
 381           i = SMOBNUM (exp);
 382           if (i < scm_numsmob && scm_smobs[i].print
 383               && (scm_smobs[i].print) (exp, port, writing))
 384             break;
 385           goto punk;
 386 #endif
 387         default:
 388 #if 0
 389         punk:
 390 #endif
 391           scm_ipruk ("type", svalue, stream);
 392         }
 393       break;
 394     }
 395 }
 396
 397 int
 398 scm_val_print (struct type *type, const gdb_byte *valaddr,
 399                int embedded_offset, CORE_ADDR address,
 400                struct ui_file *stream, int format, int deref_ref,
 401                int recurse, enum val_prettyprint pretty)
 402 {
 403   if (is_scmvalue_type (type))
 404     {
 405       LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
 406
 407       if (scm_inferior_print (svalue, stream, format,
 408                               deref_ref, recurse, pretty) >= 0)
 409         {
 410         }
 411       else
 412         {
 413           scm_scmval_print (svalue, stream, format,
 414                             deref_ref, recurse, pretty);
 415         }
 416
 417       gdb_flush (stream);
 418       return (0);
 419     }
 420   else
 421     {
 422       return c_val_print (type, valaddr, 0, address, stream, format,
 423                           deref_ref, recurse, pretty);
 424     }
 425 }
 426
 427 int
 428 scm_value_print (struct value *val, struct ui_file *stream, int format,
 429                  enum val_prettyprint pretty)
 430 {
 431   return (common_val_print (val, stream, format, 1, 0, pretty,
 432                             current_language));
 433 }