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