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, 2009
   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 #include "objfiles.h"
  34
  35 static void scm_ipruk (char *, struct type *, LONGEST, struct ui_file *);
  36 static void scm_scmval_print (struct type *, LONGEST, struct ui_file *,
  37                               int, const struct value_print_options *);
  38 static void scm_scmlist_print (struct type *, LONGEST, struct ui_file *,
  39                                int, const struct value_print_options *);
  40 static int scm_inferior_print (struct type *, LONGEST, struct ui_file *,
  41                                int, const struct value_print_options *);
  42
  43 /* Prints the SCM value VALUE by invoking the inferior, if appropraite.
  44    Returns >= 0 on success;  return -1 if the inferior cannot/should not
  45    print VALUE. */
  46
  47 static int
  48 scm_inferior_print (struct type *type, LONGEST value, struct ui_file *stream,
  49                     int recurse, const struct value_print_options *options)
  50 {
  51   struct value *func, *arg, *result;
  52   struct symbol *gdb_output_sym, *gdb_output_len_sym;
  53   char *output;
  54   int ret, output_len;
  55
  56   func = find_function_in_inferior ("gdb_print", NULL);
  57   arg = value_from_longest (type, value);
  58
  59   result = call_function_by_hand (func, 1, &arg);
  60   ret = (int) value_as_long (result);
  61   if (ret == 0)
  62     {
  63       /* XXX: Should we cache these symbols?  */
  64       gdb_output_sym =
  65         lookup_symbol_global ("gdb_output", NULL, NULL, VAR_DOMAIN);
  66       gdb_output_len_sym =
  67         lookup_symbol_global ("gdb_output_length", NULL, NULL, VAR_DOMAIN);
  68
  69       if ((gdb_output_sym == NULL) || (gdb_output_len_sym == NULL))
  70         ret = -1;
  71       else
  72         {
  73           struct value *remote_buffer;
  74
  75           read_memory (SYMBOL_VALUE_ADDRESS (gdb_output_len_sym),
  76                        (char *) &output_len, sizeof (output_len));
  77
  78           output = (char *) alloca (output_len);
  79           remote_buffer = value_at (type,
  80                                     SYMBOL_VALUE_ADDRESS (gdb_output_sym));
  81           read_memory (value_as_address (remote_buffer),
  82                        output, output_len);
  83
  84           ui_file_write (stream, output, output_len);
  85         }
  86     }
  87
  88   return ret;
  89 }
  90
  91 /* {Names of immediate symbols}
  92  * This table must agree with the declarations in scm.h: {Immediate Symbols}.*/
  93
  94 static char *scm_isymnames[] =
  95 {
  96   /* This table must agree with the declarations */
  97   "and",
  98   "begin",
  99   "case",
 100   "cond",
 101   "do",
 102   "if",
 103   "lambda",
 104   "let",
 105   "let*",
 106   "letrec",
 107   "or",
 108   "quote",
 109   "set!",
 110   "define",
 111 #if 0
 112   "literal-variable-ref",
 113   "literal-variable-set!",
 114 #endif
 115   "apply",
 116   "call-with-current-continuation",
 117
 118  /* user visible ISYMS */
 119  /* other keywords */
 120  /* Flags */
 121
 122   "#f",
 123   "#t",
 124   "#<undefined>",
 125   "#<eof>",
 126   "()",
 127   "#<unspecified>"
 128 };
 129
 130 static void
 131 scm_scmlist_print (struct type *type, LONGEST svalue,
 132                    struct ui_file *stream, int recurse,
 133                    const struct value_print_options *options)
 134 {
 135 #define SCM_SIZE (TYPE_LENGTH (type))
 136   unsigned int more = options->print_max;
 137   if (recurse > 6)
 138     {
 139       fputs_filtered ("...", stream);
 140       return;
 141     }
 142   scm_scmval_print (type, SCM_CAR (svalue), stream, recurse + 1, options);
 143   svalue = SCM_CDR (svalue);
 144   for (; SCM_NIMP (svalue); svalue = SCM_CDR (svalue))
 145     {
 146       if (SCM_NECONSP (svalue))
 147         break;
 148       fputs_filtered (" ", stream);
 149       if (--more == 0)
 150         {
 151           fputs_filtered ("...", stream);
 152           return;
 153         }
 154       scm_scmval_print (type, SCM_CAR (svalue), stream, recurse + 1, options);
 155     }
 156   if (SCM_NNULLP (svalue))
 157     {
 158       fputs_filtered (" . ", stream);
 159       scm_scmval_print (type, svalue, stream, recurse + 1, options);
 160     }
 161 #undef SCM_SIZE
 162 }
 163
 164 static void
 165 scm_ipruk (char *hdr, struct type *type, LONGEST ptr,
 166            struct ui_file *stream)
 167 {
 168 #define SCM_SIZE (TYPE_LENGTH (type))
 169   fprintf_filtered (stream, "#<unknown-%s", hdr);
 170   if (SCM_CELLP (ptr))
 171     fprintf_filtered (stream, " (0x%lx . 0x%lx) @",
 172                       (long) SCM_CAR (ptr), (long) SCM_CDR (ptr));
 173   fprintf_filtered (stream, " 0x%s>", paddr_nz (ptr));
 174 #undef SCM_SIZE
 175 }
 176
 177 static void
 178 scm_scmval_print (struct type *type, LONGEST svalue,
 179                   struct ui_file *stream, int recurse,
 180                   const struct value_print_options *options)
 181 {
 182 #define SCM_SIZE (TYPE_LENGTH (type))
 183 taloop:
 184   switch (7 & (int) svalue)
 185     {
 186     case 2:
 187     case 6:
 188       print_longest (stream,
 189                      options->format ? options->format : 'd',
 190                      1, svalue >> 2);
 191       break;
 192     case 4:
 193       if (SCM_ICHRP (svalue))
 194         {
 195           svalue = SCM_ICHR (svalue);
 196           scm_printchar (svalue, builtin_type (current_gdbarch)->builtin_char,
 197                          stream);
 198           break;
 199         }
 200       else if (SCM_IFLAGP (svalue)
 201                && (SCM_ISYMNUM (svalue)
 202                    < (sizeof scm_isymnames / sizeof (char *))))
 203         {
 204           fputs_filtered (SCM_ISYMCHARS (svalue), stream);
 205           break;
 206         }
 207       else if (SCM_ILOCP (svalue))
 208         {
 209           fprintf_filtered (stream, "#@%ld%c%ld",
 210                             (long) SCM_IFRAME (svalue),
 211                             SCM_ICDRP (svalue) ? '-' : '+',
 212                             (long) SCM_IDIST (svalue));
 213           break;
 214         }
 215       else
 216         goto idef;
 217       break;
 218     case 1:
 219       /* gloc */
 220       svalue = SCM_CAR (svalue - 1);
 221       goto taloop;
 222     default:
 223     idef:
 224       scm_ipruk ("immediate", type, svalue, stream);
 225       break;
 226     case 0:
 227
 228       switch (SCM_TYP7 (svalue))
 229         {
 230         case scm_tcs_cons_gloc:
 231           if (SCM_CDR (SCM_CAR (svalue) - 1L) == 0)
 232             {
 233 #if 0
 234               SCM name;
 235 #endif
 236               fputs_filtered ("#<latte ", stream);
 237 #if 1
 238               fputs_filtered ("???", stream);
 239 #else
 240               name = ((SCM n *) (STRUCT_TYPE (exp)))[struct_i_name];
 241               scm_lfwrite (CHARS (name),
 242                            (sizet) sizeof (char),
 243                              (sizet) LENGTH (name),
 244                            port);
 245 #endif
 246               fprintf_filtered (stream, " #X%s>", paddr_nz (svalue));
 247               break;
 248             }
 249         case scm_tcs_cons_imcar:
 250         case scm_tcs_cons_nimcar:
 251           fputs_filtered ("(", stream);
 252           scm_scmlist_print (type, svalue, stream, recurse + 1, options);
 253           fputs_filtered (")", stream);
 254           break;
 255         case scm_tcs_closures:
 256           fputs_filtered ("#<CLOSURE ", stream);
 257           scm_scmlist_print (type, SCM_CODE (svalue), stream,
 258                              recurse + 1, options);
 259           fputs_filtered (">", stream);
 260           break;
 261         case scm_tc7_string:
 262           {
 263             int len = SCM_LENGTH (svalue);
 264             CORE_ADDR addr = (CORE_ADDR) SCM_CDR (svalue);
 265             int i;
 266             int done = 0;
 267             int buf_size;
 268             gdb_byte buffer[64];
 269             int truncate = options->print_max && len > (int) options->print_max;
 270             if (truncate)
 271               len = options->print_max;
 272             fputs_filtered ("\"", stream);
 273             for (; done < len; done += buf_size)
 274               {
 275                 buf_size = min (len - done, 64);
 276                 read_memory (addr + done, buffer, buf_size);
 277
 278                 for (i = 0; i < buf_size; ++i)
 279                   switch (buffer[i])
 280                     {
 281                     case '\"':
 282                     case '\\':
 283                       fputs_filtered ("\\", stream);
 284                     default:
 285                       fprintf_filtered (stream, "%c", buffer[i]);
 286                     }
 287               }
 288             fputs_filtered (truncate ? "...\"" : "\"", stream);
 289             break;
 290           }
 291           break;
 292         case scm_tcs_symbols:
 293           {
 294             int len = SCM_LENGTH (svalue);
 295
 296             char *str = alloca (len);
 297             read_memory (SCM_CDR (svalue), (gdb_byte *) str, len + 1);
 298             /* Should handle weird characters FIXME */
 299             str[len] = '\0';
 300             fputs_filtered (str, stream);
 301             break;
 302           }
 303         case scm_tc7_vector:
 304           {
 305             int len = SCM_LENGTH (svalue);
 306             int i;
 307             LONGEST elements = SCM_CDR (svalue);
 308             fputs_filtered ("#(", stream);
 309             for (i = 0; i < len; ++i)
 310               {
 311                 if (i > 0)
 312                   fputs_filtered (" ", stream);
 313                 scm_scmval_print (type, scm_get_field (elements, i, SCM_SIZE),
 314                                   stream, recurse + 1, options);
 315               }
 316             fputs_filtered (")", stream);
 317           }
 318           break;
 319 #if 0
 320         case tc7_lvector:
 321           {
 322             SCM result;
 323             SCM hook;
 324             hook = scm_get_lvector_hook (exp, LV_PRINT_FN);
 325             if (hook == BOOL_F)
 326               {
 327                 scm_puts ("#<locked-vector ", port);
 328                 scm_intprint (CDR (exp), 16, port);
 329                 scm_puts (">", port);
 330               }
 331             else
 332               {
 333                 result
 334                   = scm_apply (hook,
 335                                scm_listify (exp, port,
 336                                             (writing ? BOOL_T : BOOL_F),
 337                                             SCM_UNDEFINED),
 338                                EOL);
 339                 if (result == BOOL_F)
 340                   goto punk;
 341               }
 342             break;
 343           }
 344           break;
 345         case tc7_bvect:
 346         case tc7_ivect:
 347         case tc7_uvect:
 348         case tc7_fvect:
 349         case tc7_dvect:
 350         case tc7_cvect:
 351           scm_raprin1 (exp, port, writing);
 352           break;
 353 #endif
 354         case scm_tcs_subrs:
 355           {
 356             int index = SCM_CAR (svalue) >> 8;
 357 #if 1
 358             char str[20];
 359             sprintf (str, "#%d", index);
 360 #else
 361             char *str = index ? SCM_CHARS (scm_heap_org + index) : "";
 362 #define SCM_CHARS(x) ((char *)(SCM_CDR(x)))
 363             char *str = CHARS (SNAME (exp));
 364 #endif
 365             fprintf_filtered (stream, "#<primitive-procedure %s>",
 366                               str);
 367           }
 368           break;
 369 #if 0
 370 #ifdef CCLO
 371         case tc7_cclo:
 372           scm_puts ("#<compiled-closure ", port);
 373           scm_iprin1 (CCLO_SUBR (exp), port, writing);
 374           scm_putc ('>', port);
 375           break;
 376 #endif
 377         case tc7_contin:
 378           fprintf_filtered (stream, "#<continuation %d @ #X%lx >",
 379                             LENGTH (svalue),
 380                             (long) CHARS (svalue));
 381           break;
 382         case tc7_port:
 383           i = PTOBNUM (exp);
 384           if (i < scm_numptob
 385               && scm_ptobs[i].print
 386               && (scm_ptobs[i].print) (exp, port, writing))
 387             break;
 388           goto punk;
 389         case tc7_smob:
 390           i = SMOBNUM (exp);
 391           if (i < scm_numsmob && scm_smobs[i].print
 392               && (scm_smobs[i].print) (exp, port, writing))
 393             break;
 394           goto punk;
 395 #endif
 396         default:
 397 #if 0
 398         punk:
 399 #endif
 400           scm_ipruk ("type", type, svalue, stream);
 401         }
 402       break;
 403     }
 404 #undef SCM_SIZE
 405 }
 406
 407 int
 408 scm_val_print (struct type *type, const gdb_byte *valaddr,
 409                int embedded_offset, CORE_ADDR address,
 410                struct ui_file *stream, int recurse,
 411                const struct value_print_options *options)
 412 {
 413   if (is_scmvalue_type (type))
 414     {
 415       LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
 416
 417       if (scm_inferior_print (type, svalue, stream, recurse, options) >= 0)
 418         {
 419         }
 420       else
 421         {
 422           scm_scmval_print (type, svalue, stream, recurse, options);
 423         }
 424
 425       gdb_flush (stream);
 426       return (0);
 427     }
 428   else
 429     {
 430       return c_val_print (type, valaddr, 0, address, stream, recurse, options);
 431     }
 432 }
 433
 434 int
 435 scm_value_print (struct value *val, struct ui_file *stream,
 436                  const struct value_print_options *options)
 437 {
 438   struct value_print_options opts = *options;
 439   opts.deref_ref = 1;
 440   return (common_val_print (val, stream, 0, &opts, current_language));
 441 }