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 #define SCM_BYTE_ORDER (gdbarch_byte_order (get_type_arch (type)))
 137   unsigned int more = options->print_max;
 138   if (recurse > 6)
 139     {
 140       fputs_filtered ("...", stream);
 141       return;
 142     }
 143   scm_scmval_print (type, SCM_CAR (svalue), stream, recurse + 1, options);
 144   svalue = SCM_CDR (svalue);
 145   for (; SCM_NIMP (svalue); svalue = SCM_CDR (svalue))
 146     {
 147       if (SCM_NECONSP (svalue))
 148         break;
 149       fputs_filtered (" ", stream);
 150       if (--more == 0)
 151         {
 152           fputs_filtered ("...", stream);
 153           return;
 154         }
 155       scm_scmval_print (type, SCM_CAR (svalue), stream, recurse + 1, options);
 156     }
 157   if (SCM_NNULLP (svalue))
 158     {
 159       fputs_filtered (" . ", stream);
 160       scm_scmval_print (type, svalue, stream, recurse + 1, options);
 161     }
 162 #undef SCM_BYTE_ORDER
 163 #undef SCM_SIZE
 164 }
 165
 166 static void
 167 scm_ipruk (char *hdr, struct type *type, LONGEST ptr,
 168            struct ui_file *stream)
 169 {
 170 #define SCM_SIZE (TYPE_LENGTH (type))
 171 #define SCM_BYTE_ORDER (gdbarch_byte_order (get_type_arch (type)))
 172   fprintf_filtered (stream, "#<unknown-%s", hdr);
 173   if (SCM_CELLP (ptr))
 174     fprintf_filtered (stream, " (0x%lx . 0x%lx) @",
 175                       (long) SCM_CAR (ptr), (long) SCM_CDR (ptr));
 176   fprintf_filtered (stream, " 0x%s>", phex_nz (ptr, SCM_SIZE));
 177 #undef SCM_BYTE_ORDER
 178 #undef SCM_SIZE
 179 }
 180
 181 static void
 182 scm_scmval_print (struct type *type, LONGEST svalue,
 183                   struct ui_file *stream, int recurse,
 184                   const struct value_print_options *options)
 185 {
 186   struct gdbarch *gdbarch = get_type_arch (type);
 187
 188 #define SCM_SIZE (TYPE_LENGTH (type))
 189 #define SCM_BYTE_ORDER (gdbarch_byte_order (gdbarch))
 190 taloop:
 191   switch (7 & (int) svalue)
 192     {
 193     case 2:
 194     case 6:
 195       print_longest (stream,
 196                      options->format ? options->format : 'd',
 197                      1, svalue >> 2);
 198       break;
 199     case 4:
 200       if (SCM_ICHRP (svalue))
 201         {
 202           svalue = SCM_ICHR (svalue);
 203           scm_printchar (svalue, builtin_type (gdbarch)->builtin_char,
 204                          stream);
 205           break;
 206         }
 207       else if (SCM_IFLAGP (svalue)
 208                && (SCM_ISYMNUM (svalue)
 209                    < (sizeof scm_isymnames / sizeof (char *))))
 210         {
 211           fputs_filtered (SCM_ISYMCHARS (svalue), stream);
 212           break;
 213         }
 214       else if (SCM_ILOCP (svalue))
 215         {
 216           fprintf_filtered (stream, "#@%ld%c%ld",
 217                             (long) SCM_IFRAME (svalue),
 218                             SCM_ICDRP (svalue) ? '-' : '+',
 219                             (long) SCM_IDIST (svalue));
 220           break;
 221         }
 222       else
 223         goto idef;
 224       break;
 225     case 1:
 226       /* gloc */
 227       svalue = SCM_CAR (svalue - 1);
 228       goto taloop;
 229     default:
 230     idef:
 231       scm_ipruk ("immediate", type, svalue, stream);
 232       break;
 233     case 0:
 234
 235       switch (SCM_TYP7 (svalue))
 236         {
 237         case scm_tcs_cons_gloc:
 238           if (SCM_CDR (SCM_CAR (svalue) - 1L) == 0)
 239             {
 240 #if 0
 241               SCM name;
 242 #endif
 243               fputs_filtered ("#<latte ", stream);
 244 #if 1
 245               fputs_filtered ("???", stream);
 246 #else
 247               name = ((SCM n *) (STRUCT_TYPE (exp)))[struct_i_name];
 248               scm_lfwrite (CHARS (name),
 249                            (sizet) sizeof (char),
 250                              (sizet) LENGTH (name),
 251                            port);
 252 #endif
 253               fprintf_filtered (stream, " #X%s>", phex_nz (svalue, SCM_SIZE));
 254               break;
 255             }
 256         case scm_tcs_cons_imcar:
 257         case scm_tcs_cons_nimcar:
 258           fputs_filtered ("(", stream);
 259           scm_scmlist_print (type, svalue, stream, recurse + 1, options);
 260           fputs_filtered (")", stream);
 261           break;
 262         case scm_tcs_closures:
 263           fputs_filtered ("#<CLOSURE ", stream);
 264           scm_scmlist_print (type, SCM_CODE (svalue), stream,
 265                              recurse + 1, options);
 266           fputs_filtered (">", stream);
 267           break;
 268         case scm_tc7_string:
 269           {
 270             int len = SCM_LENGTH (svalue);
 271             CORE_ADDR addr = (CORE_ADDR) SCM_CDR (svalue);
 272             int i;
 273             int done = 0;
 274             int buf_size;
 275             gdb_byte buffer[64];
 276             int truncate = options->print_max && len > (int) options->print_max;
 277             if (truncate)
 278               len = options->print_max;
 279             fputs_filtered ("\"", stream);
 280             for (; done < len; done += buf_size)
 281               {
 282                 buf_size = min (len - done, 64);
 283                 read_memory (addr + done, buffer, buf_size);
 284
 285                 for (i = 0; i < buf_size; ++i)
 286                   switch (buffer[i])
 287                     {
 288                     case '\"':
 289                     case '\\':
 290                       fputs_filtered ("\\", stream);
 291                     default:
 292                       fprintf_filtered (stream, "%c", buffer[i]);
 293                     }
 294               }
 295             fputs_filtered (truncate ? "...\"" : "\"", stream);
 296             break;
 297           }
 298           break;
 299         case scm_tcs_symbols:
 300           {
 301             int len = SCM_LENGTH (svalue);
 302
 303             char *str = alloca (len);
 304             read_memory (SCM_CDR (svalue), (gdb_byte *) str, len + 1);
 305             /* Should handle weird characters FIXME */
 306             str[len] = '\0';
 307             fputs_filtered (str, stream);
 308             break;
 309           }
 310         case scm_tc7_vector:
 311           {
 312             int len = SCM_LENGTH (svalue);
 313             int i;
 314             LONGEST elements = SCM_CDR (svalue);
 315             LONGEST val;
 316             fputs_filtered ("#(", stream);
 317             for (i = 0; i < len; ++i)
 318               {
 319                 if (i > 0)
 320                   fputs_filtered (" ", stream);
 321                 val = scm_get_field (elements, i, SCM_SIZE, SCM_BYTE_ORDER);
 322                 scm_scmval_print (type, val, stream, recurse + 1, options);
 323               }
 324             fputs_filtered (")", stream);
 325           }
 326           break;
 327 #if 0
 328         case tc7_lvector:
 329           {
 330             SCM result;
 331             SCM hook;
 332             hook = scm_get_lvector_hook (exp, LV_PRINT_FN);
 333             if (hook == BOOL_F)
 334               {
 335                 scm_puts ("#<locked-vector ", port);
 336                 scm_intprint (CDR (exp), 16, port);
 337                 scm_puts (">", port);
 338               }
 339             else
 340               {
 341                 result
 342                   = scm_apply (hook,
 343                                scm_listify (exp, port,
 344                                             (writing ? BOOL_T : BOOL_F),
 345                                             SCM_UNDEFINED),
 346                                EOL);
 347                 if (result == BOOL_F)
 348                   goto punk;
 349               }
 350             break;
 351           }
 352           break;
 353         case tc7_bvect:
 354         case tc7_ivect:
 355         case tc7_uvect:
 356         case tc7_fvect:
 357         case tc7_dvect:
 358         case tc7_cvect:
 359           scm_raprin1 (exp, port, writing);
 360           break;
 361 #endif
 362         case scm_tcs_subrs:
 363           {
 364             int index = SCM_CAR (svalue) >> 8;
 365 #if 1
 366             char str[20];
 367             sprintf (str, "#%d", index);
 368 #else
 369             char *str = index ? SCM_CHARS (scm_heap_org + index) : "";
 370 #define SCM_CHARS(x) ((char *)(SCM_CDR(x)))
 371             char *str = CHARS (SNAME (exp));
 372 #endif
 373             fprintf_filtered (stream, "#<primitive-procedure %s>",
 374                               str);
 375           }
 376           break;
 377 #if 0
 378 #ifdef CCLO
 379         case tc7_cclo:
 380           scm_puts ("#<compiled-closure ", port);
 381           scm_iprin1 (CCLO_SUBR (exp), port, writing);
 382           scm_putc ('>', port);
 383           break;
 384 #endif
 385         case tc7_contin:
 386           fprintf_filtered (stream, "#<continuation %d @ #X%lx >",
 387                             LENGTH (svalue),
 388                             (long) CHARS (svalue));
 389           break;
 390         case tc7_port:
 391           i = PTOBNUM (exp);
 392           if (i < scm_numptob
 393               && scm_ptobs[i].print
 394               && (scm_ptobs[i].print) (exp, port, writing))
 395             break;
 396           goto punk;
 397         case tc7_smob:
 398           i = SMOBNUM (exp);
 399           if (i < scm_numsmob && scm_smobs[i].print
 400               && (scm_smobs[i].print) (exp, port, writing))
 401             break;
 402           goto punk;
 403 #endif
 404         default:
 405 #if 0
 406         punk:
 407 #endif
 408           scm_ipruk ("type", type, svalue, stream);
 409         }
 410       break;
 411     }
 412 #undef SCM_BYTE_ORDER
 413 #undef SCM_SIZE
 414 }
 415
 416 int
 417 scm_val_print (struct type *type, const gdb_byte *valaddr,
 418                int embedded_offset, CORE_ADDR address,
 419                struct ui_file *stream, int recurse,
 420                const struct value_print_options *options)
 421 {
 422   if (is_scmvalue_type (type))
 423     {
 424       enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
 425       LONGEST svalue
 426         = extract_signed_integer (valaddr, TYPE_LENGTH (type), byte_order);
 427
 428       if (scm_inferior_print (type, svalue, stream, recurse, options) >= 0)
 429         {
 430         }
 431       else
 432         {
 433           scm_scmval_print (type, svalue, stream, recurse, options);
 434         }
 435
 436       gdb_flush (stream);
 437       return (0);
 438     }
 439   else
 440     {
 441       return c_val_print (type, valaddr, 0, address, stream, recurse, options);
 442     }
 443 }
 444
 445 int
 446 scm_value_print (struct value *val, struct ui_file *stream,
 447                  const struct value_print_options *options)
 448 {
 449   struct value_print_options opts = *options;
 450   opts.deref_ref = 1;
 451   return (common_val_print (val, stream, 0, &opts, current_language));
 452 }