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