gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986-2016 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "symtab.h"
  22 #include "gdbtypes.h"
  23 #include "expression.h"
  24 #include "value.h"
  25 #include "language.h"
  26 #include "parser-defs.h"
  27 #include "user-regs.h"          /* For user_reg_map_regnum_to_name.  */
  28 #include "target.h"
  29 #include "block.h"
  30 #include "objfiles.h"
  31 #include "valprint.h"
  32
  33 #include <ctype.h>
  34
  35 void
  36 print_expression (struct expression *exp, struct ui_file *stream)
  37 {
  38   int pc = 0;
  39
  40   print_subexp (exp, &pc, stream, PREC_NULL);
  41 }
  42
  43 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  44    PREC is the precedence of the surrounding operator;
  45    if the precedence of the main operator of this subexpression is less,
  46    parentheses are needed here.  */
  47
  48 void
  49 print_subexp (struct expression *exp, int *pos,
  50               struct ui_file *stream, enum precedence prec)
  51 {
  52   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  53 }
  54
  55 /* Standard implementation of print_subexp for use in language_defn
  56    vectors.  */
  57 void
  58 print_subexp_standard (struct expression *exp, int *pos,
  59                        struct ui_file *stream, enum precedence prec)
  60 {
  61   unsigned tem;
  62   const struct op_print *op_print_tab;
  63   int pc;
  64   unsigned nargs;
  65   char *op_str;
  66   int assign_modify = 0;
  67   enum exp_opcode opcode;
  68   enum precedence myprec = PREC_NULL;
  69   /* Set to 1 for a right-associative operator.  */
  70   int assoc = 0;
  71   struct value *val;
  72   char *tempstr = NULL;
  73
  74   op_print_tab = exp->language_defn->la_op_print_tab;
  75   pc = (*pos)++;
  76   opcode = exp->elts[pc].opcode;
  77   switch (opcode)
  78     {
  79       /* Common ops */
  80
  81     case OP_TYPE:
  82       (*pos) += 2;
  83       type_print (exp->elts[pc + 1].type, "", stream, 0);
  84       return;
  85
  86     case OP_SCOPE:
  87       myprec = PREC_PREFIX;
  88       assoc = 0;
  89       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  90       fputs_filtered ("::", stream);
  91       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  92       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  93       fputs_filtered (&exp->elts[pc + 3].string, stream);
  94       return;
  95
  96     case OP_LONG:
  97       {
  98         struct value_print_options opts;
  99
 100         get_no_prettyformat_print_options (&opts);
 101         (*pos) += 3;
 102         value_print (value_from_longest (exp->elts[pc + 1].type,
 103                                          exp->elts[pc + 2].longconst),
 104                      stream, &opts);
 105       }
 106       return;
 107
 108     case OP_DOUBLE:
 109       {
 110         struct value_print_options opts;
 111
 112         get_no_prettyformat_print_options (&opts);
 113         (*pos) += 3;
 114         value_print (value_from_double (exp->elts[pc + 1].type,
 115                                         exp->elts[pc + 2].doubleconst),
 116                      stream, &opts);
 117       }
 118       return;
 119
 120     case OP_VAR_VALUE:
 121       {
 122         const struct block *b;
 123
 124         (*pos) += 3;
 125         b = exp->elts[pc + 1].block;
 126         if (b != NULL
 127             && BLOCK_FUNCTION (b) != NULL
 128             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 129           {
 130             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 131             fputs_filtered ("::", stream);
 132           }
 133         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 134       }
 135       return;
 136
 137     case OP_VAR_ENTRY_VALUE:
 138       {
 139         (*pos) += 2;
 140         fprintf_filtered (stream, "%s@entry",
 141                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 142       }
 143       return;
 144
 145     case OP_LAST:
 146       (*pos) += 2;
 147       fprintf_filtered (stream, "$%d",
 148                         longest_to_int (exp->elts[pc + 1].longconst));
 149       return;
 150
 151     case OP_REGISTER:
 152       {
 153         const char *name = &exp->elts[pc + 2].string;
 154
 155         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 156         fprintf_filtered (stream, "$%s", name);
 157         return;
 158       }
 159
 160     case OP_BOOL:
 161       (*pos) += 2;
 162       fprintf_filtered (stream, "%s",
 163                         longest_to_int (exp->elts[pc + 1].longconst)
 164                         ? "TRUE" : "FALSE");
 165       return;
 166
 167     case OP_INTERNALVAR:
 168       (*pos) += 2;
 169       fprintf_filtered (stream, "$%s",
 170                         internalvar_name (exp->elts[pc + 1].internalvar));
 171       return;
 172
 173     case OP_FUNCALL:
 174       (*pos) += 2;
 175       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 176       print_subexp (exp, pos, stream, PREC_SUFFIX);
 177       fputs_filtered (" (", stream);
 178       for (tem = 0; tem < nargs; tem++)
 179         {
 180           if (tem != 0)
 181             fputs_filtered (", ", stream);
 182           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 183         }
 184       fputs_filtered (")", stream);
 185       return;
 186
 187     case OP_NAME:
 188       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 189       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 190       fputs_filtered (&exp->elts[pc + 2].string, stream);
 191       return;
 192
 193     case OP_STRING:
 194       {
 195         struct value_print_options opts;
 196
 197         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 198         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 199         /* LA_PRINT_STRING will print using the current repeat count threshold.
 200            If necessary, we can temporarily set it to zero, or pass it as an
 201            additional parameter to LA_PRINT_STRING.  -fnf */
 202         get_user_print_options (&opts);
 203         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 204                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 205                          NULL, 0, &opts);
 206       }
 207       return;
 208
 209     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 210                                    NSString constant.  */
 211       {
 212         struct value_print_options opts;
 213
 214         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 215         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 216         fputs_filtered ("@\"", stream);
 217         get_user_print_options (&opts);
 218         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 219                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 220                          NULL, 0, &opts);
 221         fputs_filtered ("\"", stream);
 222       }
 223       return;
 224
 225     case OP_OBJC_MSGCALL:
 226       {                 /* Objective C message (method) call.  */
 227         char *selector;
 228
 229         (*pos) += 3;
 230         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 231         fprintf_unfiltered (stream, "[");
 232         print_subexp (exp, pos, stream, PREC_SUFFIX);
 233         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 234                                      &selector, 1024, NULL))
 235           {
 236             error (_("bad selector"));
 237             return;
 238           }
 239         if (nargs)
 240           {
 241             char *s, *nextS;
 242
 243             s = (char *) alloca (strlen (selector) + 1);
 244             strcpy (s, selector);
 245             for (tem = 0; tem < nargs; tem++)
 246               {
 247                 nextS = strchr (s, ':');
 248                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 249                 *nextS = '\0';
 250                 fprintf_unfiltered (stream, " %s: ", s);
 251                 s = nextS + 1;
 252                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 253               }
 254           }
 255         else
 256           {
 257             fprintf_unfiltered (stream, " %s", selector);
 258           }
 259         fprintf_unfiltered (stream, "]");
 260         /* "selector" was malloc'd by target_read_string.  Free it.  */
 261         xfree (selector);
 262         return;
 263       }
 264
 265     case OP_ARRAY:
 266       (*pos) += 3;
 267       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 268       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 269       nargs++;
 270       tem = 0;
 271       if (exp->elts[pc + 4].opcode == OP_LONG
 272           && exp->elts[pc + 5].type
 273              == builtin_type (exp->gdbarch)->builtin_char
 274           && exp->language_defn->la_language == language_c)
 275         {
 276           /* Attempt to print C character arrays using string syntax.
 277              Walk through the args, picking up one character from each
 278              of the OP_LONG expression elements.  If any array element
 279              does not match our expection of what we should find for
 280              a simple string, revert back to array printing.  Note that
 281              the last expression element is an explicit null terminator
 282              byte, which doesn't get printed.  */
 283           tempstr = (char *) alloca (nargs);
 284           pc += 4;
 285           while (tem < nargs)
 286             {
 287               if (exp->elts[pc].opcode != OP_LONG
 288                   || exp->elts[pc + 1].type
 289                      != builtin_type (exp->gdbarch)->builtin_char)
 290                 {
 291                   /* Not a simple array of char, use regular array
 292                      printing.  */
 293                   tem = 0;
 294                   break;
 295                 }
 296               else
 297                 {
 298                   tempstr[tem++] =
 299                     longest_to_int (exp->elts[pc + 2].longconst);
 300                   pc += 4;
 301                 }
 302             }
 303         }
 304       if (tem > 0)
 305         {
 306           struct value_print_options opts;
 307
 308           get_user_print_options (&opts);
 309           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 310                            (gdb_byte *) tempstr, nargs - 1, NULL, 0, &opts);
 311           (*pos) = pc;
 312         }
 313       else
 314         {
 315           fputs_filtered (" {", stream);
 316           for (tem = 0; tem < nargs; tem++)
 317             {
 318               if (tem != 0)
 319                 {
 320                   fputs_filtered (", ", stream);
 321                 }
 322               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 323             }
 324           fputs_filtered ("}", stream);
 325         }
 326       return;
 327
 328     case TERNOP_COND:
 329       if ((int) prec > (int) PREC_COMMA)
 330         fputs_filtered ("(", stream);
 331       /* Print the subexpressions, forcing parentheses
 332          around any binary operations within them.
 333          This is more parentheses than are strictly necessary,
 334          but it looks clearer.  */
 335       print_subexp (exp, pos, stream, PREC_HYPER);
 336       fputs_filtered (" ? ", stream);
 337       print_subexp (exp, pos, stream, PREC_HYPER);
 338       fputs_filtered (" : ", stream);
 339       print_subexp (exp, pos, stream, PREC_HYPER);
 340       if ((int) prec > (int) PREC_COMMA)
 341         fputs_filtered (")", stream);
 342       return;
 343
 344     case TERNOP_SLICE:
 345       print_subexp (exp, pos, stream, PREC_SUFFIX);
 346       fputs_filtered ("(", stream);
 347       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 348       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 349       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 350       fputs_filtered (")", stream);
 351       return;
 352
 353     case STRUCTOP_STRUCT:
 354       tem = longest_to_int (exp->elts[pc + 1].longconst);
 355       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 356       print_subexp (exp, pos, stream, PREC_SUFFIX);
 357       fputs_filtered (".", stream);
 358       fputs_filtered (&exp->elts[pc + 2].string, stream);
 359       return;
 360
 361       /* Will not occur for Modula-2.  */
 362     case STRUCTOP_PTR:
 363       tem = longest_to_int (exp->elts[pc + 1].longconst);
 364       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 365       print_subexp (exp, pos, stream, PREC_SUFFIX);
 366       fputs_filtered ("->", stream);
 367       fputs_filtered (&exp->elts[pc + 2].string, stream);
 368       return;
 369
 370     case STRUCTOP_MEMBER:
 371       print_subexp (exp, pos, stream, PREC_SUFFIX);
 372       fputs_filtered (".*", stream);
 373       print_subexp (exp, pos, stream, PREC_SUFFIX);
 374       return;
 375
 376     case STRUCTOP_MPTR:
 377       print_subexp (exp, pos, stream, PREC_SUFFIX);
 378       fputs_filtered ("->*", stream);
 379       print_subexp (exp, pos, stream, PREC_SUFFIX);
 380       return;
 381
 382     case BINOP_SUBSCRIPT:
 383       print_subexp (exp, pos, stream, PREC_SUFFIX);
 384       fputs_filtered ("[", stream);
 385       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 386       fputs_filtered ("]", stream);
 387       return;
 388
 389     case UNOP_POSTINCREMENT:
 390       print_subexp (exp, pos, stream, PREC_SUFFIX);
 391       fputs_filtered ("++", stream);
 392       return;
 393
 394     case UNOP_POSTDECREMENT:
 395       print_subexp (exp, pos, stream, PREC_SUFFIX);
 396       fputs_filtered ("--", stream);
 397       return;
 398
 399     case UNOP_CAST:
 400       (*pos) += 2;
 401       if ((int) prec > (int) PREC_PREFIX)
 402         fputs_filtered ("(", stream);
 403       fputs_filtered ("(", stream);
 404       type_print (exp->elts[pc + 1].type, "", stream, 0);
 405       fputs_filtered (") ", stream);
 406       print_subexp (exp, pos, stream, PREC_PREFIX);
 407       if ((int) prec > (int) PREC_PREFIX)
 408         fputs_filtered (")", stream);
 409       return;
 410
 411     case UNOP_CAST_TYPE:
 412       if ((int) prec > (int) PREC_PREFIX)
 413         fputs_filtered ("(", stream);
 414       fputs_filtered ("(", stream);
 415       print_subexp (exp, pos, stream, PREC_PREFIX);
 416       fputs_filtered (") ", stream);
 417       print_subexp (exp, pos, stream, PREC_PREFIX);
 418       if ((int) prec > (int) PREC_PREFIX)
 419         fputs_filtered (")", stream);
 420       return;
 421
 422     case UNOP_DYNAMIC_CAST:
 423     case UNOP_REINTERPRET_CAST:
 424       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 425                       : "reinterpret_cast", stream);
 426       fputs_filtered ("<", stream);
 427       print_subexp (exp, pos, stream, PREC_PREFIX);
 428       fputs_filtered ("> (", stream);
 429       print_subexp (exp, pos, stream, PREC_PREFIX);
 430       fputs_filtered (")", stream);
 431       return;
 432
 433     case UNOP_MEMVAL:
 434       (*pos) += 2;
 435       if ((int) prec > (int) PREC_PREFIX)
 436         fputs_filtered ("(", stream);
 437       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 438           && exp->elts[pc + 3].opcode == OP_LONG)
 439         {
 440           struct value_print_options opts;
 441
 442           /* We have a minimal symbol fn, probably.  It's encoded
 443              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 444              Swallow the OP_LONG (including both its opcodes); ignore
 445              its type; print the value in the type of the MEMVAL.  */
 446           (*pos) += 4;
 447           val = value_at_lazy (exp->elts[pc + 1].type,
 448                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 449           get_no_prettyformat_print_options (&opts);
 450           value_print (val, stream, &opts);
 451         }
 452       else
 453         {
 454           fputs_filtered ("{", stream);
 455           type_print (exp->elts[pc + 1].type, "", stream, 0);
 456           fputs_filtered ("} ", stream);
 457           print_subexp (exp, pos, stream, PREC_PREFIX);
 458         }
 459       if ((int) prec > (int) PREC_PREFIX)
 460         fputs_filtered (")", stream);
 461       return;
 462
 463     case UNOP_MEMVAL_TYPE:
 464       if ((int) prec > (int) PREC_PREFIX)
 465         fputs_filtered ("(", stream);
 466       fputs_filtered ("{", stream);
 467       print_subexp (exp, pos, stream, PREC_PREFIX);
 468       fputs_filtered ("} ", stream);
 469       print_subexp (exp, pos, stream, PREC_PREFIX);
 470       if ((int) prec > (int) PREC_PREFIX)
 471         fputs_filtered (")", stream);
 472       return;
 473
 474     case UNOP_MEMVAL_TLS:
 475       (*pos) += 3;
 476       if ((int) prec > (int) PREC_PREFIX)
 477         fputs_filtered ("(", stream);
 478       fputs_filtered ("{", stream);
 479       type_print (exp->elts[pc + 2].type, "", stream, 0);
 480       fputs_filtered ("} ", stream);
 481       print_subexp (exp, pos, stream, PREC_PREFIX);
 482       if ((int) prec > (int) PREC_PREFIX)
 483         fputs_filtered (")", stream);
 484       return;
 485
 486     case BINOP_ASSIGN_MODIFY:
 487       opcode = exp->elts[pc + 1].opcode;
 488       (*pos) += 2;
 489       myprec = PREC_ASSIGN;
 490       assoc = 1;
 491       assign_modify = 1;
 492       op_str = "???";
 493       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 494         if (op_print_tab[tem].opcode == opcode)
 495           {
 496             op_str = op_print_tab[tem].string;
 497             break;
 498           }
 499       if (op_print_tab[tem].opcode != opcode)
 500         /* Not found; don't try to keep going because we don't know how
 501            to interpret further elements.  */
 502         error (_("Invalid expression"));
 503       break;
 504
 505       /* C++ ops */
 506
 507     case OP_THIS:
 508       ++(*pos);
 509       if (exp->language_defn->la_name_of_this)
 510         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 511       else
 512         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 513                           exp->language_defn->la_name);
 514       return;
 515
 516       /* Modula-2 ops */
 517
 518     case MULTI_SUBSCRIPT:
 519       (*pos) += 2;
 520       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 521       print_subexp (exp, pos, stream, PREC_SUFFIX);
 522       fprintf_unfiltered (stream, " [");
 523       for (tem = 0; tem < nargs; tem++)
 524         {
 525           if (tem != 0)
 526             fprintf_unfiltered (stream, ", ");
 527           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 528         }
 529       fprintf_unfiltered (stream, "]");
 530       return;
 531
 532     case BINOP_VAL:
 533       (*pos) += 2;
 534       fprintf_unfiltered (stream, "VAL(");
 535       type_print (exp->elts[pc + 1].type, "", stream, 0);
 536       fprintf_unfiltered (stream, ",");
 537       print_subexp (exp, pos, stream, PREC_PREFIX);
 538       fprintf_unfiltered (stream, ")");
 539       return;
 540
 541     case TYPE_INSTANCE:
 542       {
 543         LONGEST count = exp->elts[pc + 1].longconst;
 544
 545         /* The COUNT.  */
 546         (*pos)++;
 547         fputs_unfiltered ("TypesInstance(", stream);
 548         while (count-- > 0)
 549           {
 550             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 551             if (count > 0)
 552               fputs_unfiltered (",", stream);
 553           }
 554         fputs_unfiltered (",", stream);
 555         /* Ending COUNT and ending TYPE_INSTANCE.  */
 556         (*pos) += 2;
 557         print_subexp (exp, pos, stream, PREC_PREFIX);
 558         fputs_unfiltered (")", stream);
 559         return;
 560       }
 561
 562       /* Default ops */
 563
 564     default:
 565       op_str = "???";
 566       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 567         if (op_print_tab[tem].opcode == opcode)
 568           {
 569             op_str = op_print_tab[tem].string;
 570             myprec = op_print_tab[tem].precedence;
 571             assoc = op_print_tab[tem].right_assoc;
 572             break;
 573           }
 574       if (op_print_tab[tem].opcode != opcode)
 575         /* Not found; don't try to keep going because we don't know how
 576            to interpret further elements.  For example, this happens
 577            if opcode is OP_TYPE.  */
 578         error (_("Invalid expression"));
 579     }
 580
 581   /* Note that PREC_BUILTIN will always emit parentheses.  */
 582   if ((int) myprec < (int) prec)
 583     fputs_filtered ("(", stream);
 584   if ((int) opcode > (int) BINOP_END)
 585     {
 586       if (assoc)
 587         {
 588           /* Unary postfix operator.  */
 589           print_subexp (exp, pos, stream, PREC_SUFFIX);
 590           fputs_filtered (op_str, stream);
 591         }
 592       else
 593         {
 594           /* Unary prefix operator.  */
 595           fputs_filtered (op_str, stream);
 596           if (myprec == PREC_BUILTIN_FUNCTION)
 597             fputs_filtered ("(", stream);
 598           print_subexp (exp, pos, stream, PREC_PREFIX);
 599           if (myprec == PREC_BUILTIN_FUNCTION)
 600             fputs_filtered (")", stream);
 601         }
 602     }
 603   else
 604     {
 605       /* Binary operator.  */
 606       /* Print left operand.
 607          If operator is right-associative,
 608          increment precedence for this operand.  */
 609       print_subexp (exp, pos, stream,
 610                     (enum precedence) ((int) myprec + assoc));
 611       /* Print the operator itself.  */
 612       if (assign_modify)
 613         fprintf_filtered (stream, " %s= ", op_str);
 614       else if (op_str[0] == ',')
 615         fprintf_filtered (stream, "%s ", op_str);
 616       else
 617         fprintf_filtered (stream, " %s ", op_str);
 618       /* Print right operand.
 619          If operator is left-associative,
 620          increment precedence for this operand.  */
 621       print_subexp (exp, pos, stream,
 622                     (enum precedence) ((int) myprec + !assoc));
 623     }
 624
 625   if ((int) myprec < (int) prec)
 626     fputs_filtered (")", stream);
 627 }
 628
 629 /* Return the operator corresponding to opcode OP as
 630    a string.   NULL indicates that the opcode was not found in the
 631    current language table.  */
 632 char *
 633 op_string (enum exp_opcode op)
 634 {
 635   int tem;
 636   const struct op_print *op_print_tab;
 637
 638   op_print_tab = current_language->la_op_print_tab;
 639   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 640     if (op_print_tab[tem].opcode == op)
 641       return op_print_tab[tem].string;
 642   return NULL;
 643 }
 644
 645 /* Support for dumping the raw data from expressions in a human readable
 646    form.  */
 647
 648 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 649
 650 /* Name for OPCODE, when it appears in expression EXP.  */
 651
 652 char *
 653 op_name (struct expression *exp, enum exp_opcode opcode)
 654 {
 655   return exp->language_defn->la_exp_desc->op_name (opcode);
 656 }
 657
 658 /* Default name for the standard operator OPCODE (i.e., one defined in
 659    the definition of enum exp_opcode).  */
 660
 661 char *
 662 op_name_standard (enum exp_opcode opcode)
 663 {
 664   switch (opcode)
 665     {
 666     default:
 667       {
 668         static char buf[30];
 669
 670         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 671         return buf;
 672       }
 673 #define OP(name)        \
 674     case name:          \
 675       return #name ;
 676 #include "std-operator.def"
 677 #undef OP
 678     }
 679 }
 680
 681 /* Print a raw dump of expression EXP to STREAM.
 682    NOTE, if non-NULL, is printed as extra explanatory text.  */
 683
 684 void
 685 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 686                      char *note)
 687 {
 688   int elt;
 689   char *opcode_name;
 690   char *eltscan;
 691   int eltsize;
 692
 693   fprintf_filtered (stream, "Dump of expression @ ");
 694   gdb_print_host_address (exp, stream);
 695   if (note)
 696     fprintf_filtered (stream, ", %s:", note);
 697   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 698                     exp->language_defn->la_name, exp->nelts,
 699                     (long) sizeof (union exp_element));
 700   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 701                     "Hex Value", "String Value");
 702   for (elt = 0; elt < exp->nelts; elt++)
 703     {
 704       fprintf_filtered (stream, "\t%5d  ", elt);
 705       opcode_name = op_name (exp, exp->elts[elt].opcode);
 706
 707       fprintf_filtered (stream, "%20s  ", opcode_name);
 708       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 709       fprintf_filtered (stream, "  ");
 710
 711       for (eltscan = (char *) &exp->elts[elt],
 712            eltsize = sizeof (union exp_element);
 713            eltsize-- > 0;
 714            eltscan++)
 715         {
 716           fprintf_filtered (stream, "%c",
 717                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 718         }
 719       fprintf_filtered (stream, "\n");
 720     }
 721 }
 722
 723 /* Dump the subexpression of prefix expression EXP whose operator is at
 724    position ELT onto STREAM.  Returns the position of the next
 725    subexpression in EXP.  */
 726
 727 int
 728 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 729 {
 730   static int indent = 0;
 731   int i;
 732
 733   fprintf_filtered (stream, "\n");
 734   fprintf_filtered (stream, "\t%5d  ", elt);
 735
 736   for (i = 1; i <= indent; i++)
 737     fprintf_filtered (stream, " ");
 738   indent += 2;
 739
 740   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 741
 742   elt = dump_subexp_body (exp, stream, elt);
 743
 744   indent -= 2;
 745
 746   return elt;
 747 }
 748
 749 /* Dump the operands of prefix expression EXP whose opcode is at
 750    position ELT onto STREAM.  Returns the position of the next
 751    subexpression in EXP.  */
 752
 753 static int
 754 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 755 {
 756   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 757 }
 758
 759 /* Default value for subexp_body in exp_descriptor vector.  */
 760
 761 int
 762 dump_subexp_body_standard (struct expression *exp,
 763                            struct ui_file *stream, int elt)
 764 {
 765   int opcode = exp->elts[elt++].opcode;
 766
 767   switch (opcode)
 768     {
 769     case TERNOP_COND:
 770     case TERNOP_SLICE:
 771       elt = dump_subexp (exp, stream, elt);
 772       /* FALL THROUGH */
 773     case BINOP_ADD:
 774     case BINOP_SUB:
 775     case BINOP_MUL:
 776     case BINOP_DIV:
 777     case BINOP_REM:
 778     case BINOP_MOD:
 779     case BINOP_LSH:
 780     case BINOP_RSH:
 781     case BINOP_LOGICAL_AND:
 782     case BINOP_LOGICAL_OR:
 783     case BINOP_BITWISE_AND:
 784     case BINOP_BITWISE_IOR:
 785     case BINOP_BITWISE_XOR:
 786     case BINOP_EQUAL:
 787     case BINOP_NOTEQUAL:
 788     case BINOP_LESS:
 789     case BINOP_GTR:
 790     case BINOP_LEQ:
 791     case BINOP_GEQ:
 792     case BINOP_REPEAT:
 793     case BINOP_ASSIGN:
 794     case BINOP_COMMA:
 795     case BINOP_SUBSCRIPT:
 796     case BINOP_EXP:
 797     case BINOP_MIN:
 798     case BINOP_MAX:
 799     case BINOP_INTDIV:
 800     case BINOP_ASSIGN_MODIFY:
 801     case BINOP_VAL:
 802     case BINOP_CONCAT:
 803     case BINOP_END:
 804     case STRUCTOP_MEMBER:
 805     case STRUCTOP_MPTR:
 806       elt = dump_subexp (exp, stream, elt);
 807       /* FALL THROUGH */
 808     case UNOP_NEG:
 809     case UNOP_LOGICAL_NOT:
 810     case UNOP_COMPLEMENT:
 811     case UNOP_IND:
 812     case UNOP_ADDR:
 813     case UNOP_PREINCREMENT:
 814     case UNOP_POSTINCREMENT:
 815     case UNOP_PREDECREMENT:
 816     case UNOP_POSTDECREMENT:
 817     case UNOP_SIZEOF:
 818     case UNOP_PLUS:
 819     case UNOP_CAP:
 820     case UNOP_CHR:
 821     case UNOP_ORD:
 822     case UNOP_ABS:
 823     case UNOP_FLOAT:
 824     case UNOP_HIGH:
 825     case UNOP_MAX:
 826     case UNOP_MIN:
 827     case UNOP_ODD:
 828     case UNOP_TRUNC:
 829       elt = dump_subexp (exp, stream, elt);
 830       break;
 831     case OP_LONG:
 832       fprintf_filtered (stream, "Type @");
 833       gdb_print_host_address (exp->elts[elt].type, stream);
 834       fprintf_filtered (stream, " (");
 835       type_print (exp->elts[elt].type, NULL, stream, 0);
 836       fprintf_filtered (stream, "), value %ld (0x%lx)",
 837                         (long) exp->elts[elt + 1].longconst,
 838                         (long) exp->elts[elt + 1].longconst);
 839       elt += 3;
 840       break;
 841     case OP_DOUBLE:
 842       fprintf_filtered (stream, "Type @");
 843       gdb_print_host_address (exp->elts[elt].type, stream);
 844       fprintf_filtered (stream, " (");
 845       type_print (exp->elts[elt].type, NULL, stream, 0);
 846       fprintf_filtered (stream, "), value %g",
 847                         (double) exp->elts[elt + 1].doubleconst);
 848       elt += 3;
 849       break;
 850     case OP_VAR_VALUE:
 851       fprintf_filtered (stream, "Block @");
 852       gdb_print_host_address (exp->elts[elt].block, stream);
 853       fprintf_filtered (stream, ", symbol @");
 854       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 855       fprintf_filtered (stream, " (%s)",
 856                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 857       elt += 3;
 858       break;
 859     case OP_VAR_ENTRY_VALUE:
 860       fprintf_filtered (stream, "Entry value of symbol @");
 861       gdb_print_host_address (exp->elts[elt].symbol, stream);
 862       fprintf_filtered (stream, " (%s)",
 863                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 864       elt += 2;
 865       break;
 866     case OP_LAST:
 867       fprintf_filtered (stream, "History element %ld",
 868                         (long) exp->elts[elt].longconst);
 869       elt += 2;
 870       break;
 871     case OP_REGISTER:
 872       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 873       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 874       break;
 875     case OP_INTERNALVAR:
 876       fprintf_filtered (stream, "Internal var @");
 877       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 878       fprintf_filtered (stream, " (%s)",
 879                         internalvar_name (exp->elts[elt].internalvar));
 880       elt += 2;
 881       break;
 882     case OP_FUNCALL:
 883       {
 884         int i, nargs;
 885
 886         nargs = longest_to_int (exp->elts[elt].longconst);
 887
 888         fprintf_filtered (stream, "Number of args: %d", nargs);
 889         elt += 2;
 890
 891         for (i = 1; i <= nargs + 1; i++)
 892           elt = dump_subexp (exp, stream, elt);
 893       }
 894       break;
 895     case OP_ARRAY:
 896       {
 897         int lower, upper;
 898         int i;
 899
 900         lower = longest_to_int (exp->elts[elt].longconst);
 901         upper = longest_to_int (exp->elts[elt + 1].longconst);
 902
 903         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 904         elt += 3;
 905
 906         for (i = 1; i <= upper - lower + 1; i++)
 907           elt = dump_subexp (exp, stream, elt);
 908       }
 909       break;
 910     case UNOP_DYNAMIC_CAST:
 911     case UNOP_REINTERPRET_CAST:
 912     case UNOP_CAST_TYPE:
 913     case UNOP_MEMVAL_TYPE:
 914       fprintf_filtered (stream, " (");
 915       elt = dump_subexp (exp, stream, elt);
 916       fprintf_filtered (stream, ")");
 917       elt = dump_subexp (exp, stream, elt);
 918       break;
 919     case UNOP_MEMVAL:
 920     case UNOP_CAST:
 921       fprintf_filtered (stream, "Type @");
 922       gdb_print_host_address (exp->elts[elt].type, stream);
 923       fprintf_filtered (stream, " (");
 924       type_print (exp->elts[elt].type, NULL, stream, 0);
 925       fprintf_filtered (stream, ")");
 926       elt = dump_subexp (exp, stream, elt + 2);
 927       break;
 928     case UNOP_MEMVAL_TLS:
 929       fprintf_filtered (stream, "TLS type @");
 930       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 931       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 932                         (exp->elts[elt].objfile == NULL ? "(null)"
 933                          : objfile_name (exp->elts[elt].objfile)));
 934       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 935       fprintf_filtered (stream, ")");
 936       elt = dump_subexp (exp, stream, elt + 3);
 937       break;
 938     case OP_TYPE:
 939       fprintf_filtered (stream, "Type @");
 940       gdb_print_host_address (exp->elts[elt].type, stream);
 941       fprintf_filtered (stream, " (");
 942       type_print (exp->elts[elt].type, NULL, stream, 0);
 943       fprintf_filtered (stream, ")");
 944       elt += 2;
 945       break;
 946     case OP_TYPEOF:
 947     case OP_DECLTYPE:
 948       fprintf_filtered (stream, "Typeof (");
 949       elt = dump_subexp (exp, stream, elt);
 950       fprintf_filtered (stream, ")");
 951       break;
 952     case OP_TYPEID:
 953       fprintf_filtered (stream, "typeid (");
 954       elt = dump_subexp (exp, stream, elt);
 955       fprintf_filtered (stream, ")");
 956       break;
 957     case STRUCTOP_STRUCT:
 958     case STRUCTOP_PTR:
 959       {
 960         char *elem_name;
 961         int len;
 962
 963         len = longest_to_int (exp->elts[elt].longconst);
 964         elem_name = &exp->elts[elt + 1].string;
 965
 966         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 967         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 968       }
 969       break;
 970     case OP_SCOPE:
 971       {
 972         char *elem_name;
 973         int len;
 974
 975         fprintf_filtered (stream, "Type @");
 976         gdb_print_host_address (exp->elts[elt].type, stream);
 977         fprintf_filtered (stream, " (");
 978         type_print (exp->elts[elt].type, NULL, stream, 0);
 979         fprintf_filtered (stream, ") ");
 980
 981         len = longest_to_int (exp->elts[elt + 1].longconst);
 982         elem_name = &exp->elts[elt + 2].string;
 983
 984         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
 985         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
 986       }
 987       break;
 988     case TYPE_INSTANCE:
 989       {
 990         LONGEST len;
 991
 992         len = exp->elts[elt++].longconst;
 993         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
 994         while (len-- > 0)
 995           {
 996             fprintf_filtered (stream, "Type @");
 997             gdb_print_host_address (exp->elts[elt].type, stream);
 998             fprintf_filtered (stream, " (");
 999             type_print (exp->elts[elt].type, NULL, stream, 0);
1000             fprintf_filtered (stream, ")");
1001             elt++;
1002             if (len > 0)
1003               fputs_filtered (", ", stream);
1004           }
1005         /* Ending LEN and ending TYPE_INSTANCE.  */
1006         elt += 2;
1007         elt = dump_subexp (exp, stream, elt);
1008       }
1009       break;
1010     case OP_STRING:
1011       {
1012         LONGEST len = exp->elts[elt].longconst;
1013         LONGEST type = exp->elts[elt + 1].longconst;
1014
1015         fprintf_filtered (stream, "Language-specific string type: %s",
1016                           plongest (type));
1017
1018         /* Skip length.  */
1019         elt += 1;
1020
1021         /* Skip string content. */
1022         elt += BYTES_TO_EXP_ELEM (len);
1023
1024         /* Skip length and ending OP_STRING. */
1025         elt += 2;
1026       }
1027       break;
1028     default:
1029     case OP_NULL:
1030     case MULTI_SUBSCRIPT:
1031     case OP_F77_UNDETERMINED_ARGLIST:
1032     case OP_COMPLEX:
1033     case OP_BOOL:
1034     case OP_M2_STRING:
1035     case OP_THIS:
1036     case OP_NAME:
1037       fprintf_filtered (stream, "Unknown format");
1038     }
1039
1040   return elt;
1041 }
1042
1043 void
1044 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1045 {
1046   int elt;
1047
1048   fprintf_filtered (stream, "Dump of expression @ ");
1049   gdb_print_host_address (exp, stream);
1050   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1051   print_expression (exp, stream);
1052   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1053                     exp->language_defn->la_name, exp->nelts,
1054                     (long) sizeof (union exp_element));
1055   fputs_filtered ("\n", stream);
1056
1057   for (elt = 0; elt < exp->nelts;)
1058     elt = dump_subexp (exp, stream, elt);
1059   fputs_filtered ("\n", stream);
1060 }