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 #include "f-lang.h"
  33
  34 #include <ctype.h>
  35
  36 void
  37 print_expression (struct expression *exp, struct ui_file *stream)
  38 {
  39   int pc = 0;
  40
  41   print_subexp (exp, &pc, stream, PREC_NULL);
  42 }
  43
  44 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  45    PREC is the precedence of the surrounding operator;
  46    if the precedence of the main operator of this subexpression is less,
  47    parentheses are needed here.  */
  48
  49 void
  50 print_subexp (struct expression *exp, int *pos,
  51               struct ui_file *stream, enum precedence prec)
  52 {
  53   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  54 }
  55
  56 /* Standard implementation of print_subexp for use in language_defn
  57    vectors.  */
  58 void
  59 print_subexp_standard (struct expression *exp, int *pos,
  60                        struct ui_file *stream, enum precedence prec)
  61 {
  62   unsigned tem;
  63   const struct op_print *op_print_tab;
  64   int pc;
  65   unsigned nargs;
  66   char *op_str;
  67   int assign_modify = 0;
  68   enum exp_opcode opcode;
  69   enum precedence myprec = PREC_NULL;
  70   /* Set to 1 for a right-associative operator.  */
  71   int assoc = 0;
  72   struct value *val;
  73   char *tempstr = NULL;
  74
  75   op_print_tab = exp->language_defn->la_op_print_tab;
  76   pc = (*pos)++;
  77   opcode = exp->elts[pc].opcode;
  78   switch (opcode)
  79     {
  80       /* Common ops */
  81
  82     case OP_TYPE:
  83       (*pos) += 2;
  84       type_print (exp->elts[pc + 1].type, "", stream, 0);
  85       return;
  86
  87     case OP_SCOPE:
  88       myprec = PREC_PREFIX;
  89       assoc = 0;
  90       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  91       fputs_filtered ("::", stream);
  92       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  93       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  94       fputs_filtered (&exp->elts[pc + 3].string, stream);
  95       return;
  96
  97     case OP_LONG:
  98       {
  99         struct value_print_options opts;
 100
 101         get_no_prettyformat_print_options (&opts);
 102         (*pos) += 3;
 103         value_print (value_from_longest (exp->elts[pc + 1].type,
 104                                          exp->elts[pc + 2].longconst),
 105                      stream, &opts);
 106       }
 107       return;
 108
 109     case OP_DOUBLE:
 110       {
 111         struct value_print_options opts;
 112
 113         get_no_prettyformat_print_options (&opts);
 114         (*pos) += 3;
 115         value_print (value_from_double (exp->elts[pc + 1].type,
 116                                         exp->elts[pc + 2].doubleconst),
 117                      stream, &opts);
 118       }
 119       return;
 120
 121     case OP_VAR_VALUE:
 122       {
 123         const struct block *b;
 124
 125         (*pos) += 3;
 126         b = exp->elts[pc + 1].block;
 127         if (b != NULL
 128             && BLOCK_FUNCTION (b) != NULL
 129             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 130           {
 131             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 132             fputs_filtered ("::", stream);
 133           }
 134         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 135       }
 136       return;
 137
 138     case OP_VAR_ENTRY_VALUE:
 139       {
 140         (*pos) += 2;
 141         fprintf_filtered (stream, "%s@entry",
 142                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 143       }
 144       return;
 145
 146     case OP_LAST:
 147       (*pos) += 2;
 148       fprintf_filtered (stream, "$%d",
 149                         longest_to_int (exp->elts[pc + 1].longconst));
 150       return;
 151
 152     case OP_REGISTER:
 153       {
 154         const char *name = &exp->elts[pc + 2].string;
 155
 156         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 157         fprintf_filtered (stream, "$%s", name);
 158         return;
 159       }
 160
 161     case OP_BOOL:
 162       (*pos) += 2;
 163       fprintf_filtered (stream, "%s",
 164                         longest_to_int (exp->elts[pc + 1].longconst)
 165                         ? "TRUE" : "FALSE");
 166       return;
 167
 168     case OP_INTERNALVAR:
 169       (*pos) += 2;
 170       fprintf_filtered (stream, "$%s",
 171                         internalvar_name (exp->elts[pc + 1].internalvar));
 172       return;
 173
 174     case OP_FUNCALL:
 175       (*pos) += 2;
 176       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 177       print_subexp (exp, pos, stream, PREC_SUFFIX);
 178       fputs_filtered (" (", stream);
 179       for (tem = 0; tem < nargs; tem++)
 180         {
 181           if (tem != 0)
 182             fputs_filtered (", ", stream);
 183           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 184         }
 185       fputs_filtered (")", stream);
 186       return;
 187
 188     case OP_NAME:
 189       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 190       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 191       fputs_filtered (&exp->elts[pc + 2].string, stream);
 192       return;
 193
 194     case OP_STRING:
 195       {
 196         struct value_print_options opts;
 197
 198         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 199         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 200         /* LA_PRINT_STRING will print using the current repeat count threshold.
 201            If necessary, we can temporarily set it to zero, or pass it as an
 202            additional parameter to LA_PRINT_STRING.  -fnf */
 203         get_user_print_options (&opts);
 204         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 205                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 206                          NULL, 0, &opts);
 207       }
 208       return;
 209
 210     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 211                                    NSString constant.  */
 212       {
 213         struct value_print_options opts;
 214
 215         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 216         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 217         fputs_filtered ("@\"", stream);
 218         get_user_print_options (&opts);
 219         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 220                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 221                          NULL, 0, &opts);
 222         fputs_filtered ("\"", stream);
 223       }
 224       return;
 225
 226     case OP_OBJC_MSGCALL:
 227       {                 /* Objective C message (method) call.  */
 228         char *selector;
 229
 230         (*pos) += 3;
 231         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 232         fprintf_unfiltered (stream, "[");
 233         print_subexp (exp, pos, stream, PREC_SUFFIX);
 234         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 235                                      &selector, 1024, NULL))
 236           {
 237             error (_("bad selector"));
 238             return;
 239           }
 240         if (nargs)
 241           {
 242             char *s, *nextS;
 243
 244             s = (char *) alloca (strlen (selector) + 1);
 245             strcpy (s, selector);
 246             for (tem = 0; tem < nargs; tem++)
 247               {
 248                 nextS = strchr (s, ':');
 249                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 250                 *nextS = '\0';
 251                 fprintf_unfiltered (stream, " %s: ", s);
 252                 s = nextS + 1;
 253                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 254               }
 255           }
 256         else
 257           {
 258             fprintf_unfiltered (stream, " %s", selector);
 259           }
 260         fprintf_unfiltered (stream, "]");
 261         /* "selector" was malloc'd by target_read_string.  Free it.  */
 262         xfree (selector);
 263         return;
 264       }
 265
 266     case OP_ARRAY:
 267       (*pos) += 3;
 268       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 269       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 270       nargs++;
 271       tem = 0;
 272       if (exp->elts[pc + 4].opcode == OP_LONG
 273           && exp->elts[pc + 5].type
 274              == builtin_type (exp->gdbarch)->builtin_char
 275           && exp->language_defn->la_language == language_c)
 276         {
 277           /* Attempt to print C character arrays using string syntax.
 278              Walk through the args, picking up one character from each
 279              of the OP_LONG expression elements.  If any array element
 280              does not match our expection of what we should find for
 281              a simple string, revert back to array printing.  Note that
 282              the last expression element is an explicit null terminator
 283              byte, which doesn't get printed.  */
 284           tempstr = (char *) alloca (nargs);
 285           pc += 4;
 286           while (tem < nargs)
 287             {
 288               if (exp->elts[pc].opcode != OP_LONG
 289                   || exp->elts[pc + 1].type
 290                      != builtin_type (exp->gdbarch)->builtin_char)
 291                 {
 292                   /* Not a simple array of char, use regular array
 293                      printing.  */
 294                   tem = 0;
 295                   break;
 296                 }
 297               else
 298                 {
 299                   tempstr[tem++] =
 300                     longest_to_int (exp->elts[pc + 2].longconst);
 301                   pc += 4;
 302                 }
 303             }
 304         }
 305       if (tem > 0)
 306         {
 307           struct value_print_options opts;
 308
 309           get_user_print_options (&opts);
 310           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 311                            (gdb_byte *) tempstr, nargs - 1, NULL, 0, &opts);
 312           (*pos) = pc;
 313         }
 314       else
 315         {
 316           fputs_filtered (" {", stream);
 317           for (tem = 0; tem < nargs; tem++)
 318             {
 319               if (tem != 0)
 320                 {
 321                   fputs_filtered (", ", stream);
 322                 }
 323               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 324             }
 325           fputs_filtered ("}", stream);
 326         }
 327       return;
 328
 329     case TERNOP_COND:
 330       if ((int) prec > (int) PREC_COMMA)
 331         fputs_filtered ("(", stream);
 332       /* Print the subexpressions, forcing parentheses
 333          around any binary operations within them.
 334          This is more parentheses than are strictly necessary,
 335          but it looks clearer.  */
 336       print_subexp (exp, pos, stream, PREC_HYPER);
 337       fputs_filtered (" ? ", stream);
 338       print_subexp (exp, pos, stream, PREC_HYPER);
 339       fputs_filtered (" : ", stream);
 340       print_subexp (exp, pos, stream, PREC_HYPER);
 341       if ((int) prec > (int) PREC_COMMA)
 342         fputs_filtered (")", stream);
 343       return;
 344
 345     case TERNOP_SLICE:
 346       print_subexp (exp, pos, stream, PREC_SUFFIX);
 347       fputs_filtered ("(", stream);
 348       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 349       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 350       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 351       fputs_filtered (")", stream);
 352       return;
 353
 354     case STRUCTOP_STRUCT:
 355       tem = longest_to_int (exp->elts[pc + 1].longconst);
 356       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 357       print_subexp (exp, pos, stream, PREC_SUFFIX);
 358       fputs_filtered (".", stream);
 359       fputs_filtered (&exp->elts[pc + 2].string, stream);
 360       return;
 361
 362       /* Will not occur for Modula-2.  */
 363     case STRUCTOP_PTR:
 364       tem = longest_to_int (exp->elts[pc + 1].longconst);
 365       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 366       print_subexp (exp, pos, stream, PREC_SUFFIX);
 367       fputs_filtered ("->", stream);
 368       fputs_filtered (&exp->elts[pc + 2].string, stream);
 369       return;
 370
 371     case STRUCTOP_MEMBER:
 372       print_subexp (exp, pos, stream, PREC_SUFFIX);
 373       fputs_filtered (".*", stream);
 374       print_subexp (exp, pos, stream, PREC_SUFFIX);
 375       return;
 376
 377     case STRUCTOP_MPTR:
 378       print_subexp (exp, pos, stream, PREC_SUFFIX);
 379       fputs_filtered ("->*", stream);
 380       print_subexp (exp, pos, stream, PREC_SUFFIX);
 381       return;
 382
 383     case BINOP_SUBSCRIPT:
 384       print_subexp (exp, pos, stream, PREC_SUFFIX);
 385       fputs_filtered ("[", stream);
 386       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 387       fputs_filtered ("]", stream);
 388       return;
 389
 390     case UNOP_POSTINCREMENT:
 391       print_subexp (exp, pos, stream, PREC_SUFFIX);
 392       fputs_filtered ("++", stream);
 393       return;
 394
 395     case UNOP_POSTDECREMENT:
 396       print_subexp (exp, pos, stream, PREC_SUFFIX);
 397       fputs_filtered ("--", stream);
 398       return;
 399
 400     case UNOP_CAST:
 401       (*pos) += 2;
 402       if ((int) prec > (int) PREC_PREFIX)
 403         fputs_filtered ("(", stream);
 404       fputs_filtered ("(", stream);
 405       type_print (exp->elts[pc + 1].type, "", stream, 0);
 406       fputs_filtered (") ", stream);
 407       print_subexp (exp, pos, stream, PREC_PREFIX);
 408       if ((int) prec > (int) PREC_PREFIX)
 409         fputs_filtered (")", stream);
 410       return;
 411
 412     case UNOP_CAST_TYPE:
 413       if ((int) prec > (int) PREC_PREFIX)
 414         fputs_filtered ("(", stream);
 415       fputs_filtered ("(", stream);
 416       print_subexp (exp, pos, stream, PREC_PREFIX);
 417       fputs_filtered (") ", stream);
 418       print_subexp (exp, pos, stream, PREC_PREFIX);
 419       if ((int) prec > (int) PREC_PREFIX)
 420         fputs_filtered (")", stream);
 421       return;
 422
 423     case UNOP_DYNAMIC_CAST:
 424     case UNOP_REINTERPRET_CAST:
 425       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 426                       : "reinterpret_cast", stream);
 427       fputs_filtered ("<", stream);
 428       print_subexp (exp, pos, stream, PREC_PREFIX);
 429       fputs_filtered ("> (", stream);
 430       print_subexp (exp, pos, stream, PREC_PREFIX);
 431       fputs_filtered (")", stream);
 432       return;
 433
 434     case UNOP_MEMVAL:
 435       (*pos) += 2;
 436       if ((int) prec > (int) PREC_PREFIX)
 437         fputs_filtered ("(", stream);
 438       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 439           && exp->elts[pc + 3].opcode == OP_LONG)
 440         {
 441           struct value_print_options opts;
 442
 443           /* We have a minimal symbol fn, probably.  It's encoded
 444              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 445              Swallow the OP_LONG (including both its opcodes); ignore
 446              its type; print the value in the type of the MEMVAL.  */
 447           (*pos) += 4;
 448           val = value_at_lazy (exp->elts[pc + 1].type,
 449                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 450           get_no_prettyformat_print_options (&opts);
 451           value_print (val, stream, &opts);
 452         }
 453       else
 454         {
 455           fputs_filtered ("{", stream);
 456           type_print (exp->elts[pc + 1].type, "", stream, 0);
 457           fputs_filtered ("} ", stream);
 458           print_subexp (exp, pos, stream, PREC_PREFIX);
 459         }
 460       if ((int) prec > (int) PREC_PREFIX)
 461         fputs_filtered (")", stream);
 462       return;
 463
 464     case UNOP_MEMVAL_TYPE:
 465       if ((int) prec > (int) PREC_PREFIX)
 466         fputs_filtered ("(", stream);
 467       fputs_filtered ("{", stream);
 468       print_subexp (exp, pos, stream, PREC_PREFIX);
 469       fputs_filtered ("} ", stream);
 470       print_subexp (exp, pos, stream, PREC_PREFIX);
 471       if ((int) prec > (int) PREC_PREFIX)
 472         fputs_filtered (")", stream);
 473       return;
 474
 475     case UNOP_MEMVAL_TLS:
 476       (*pos) += 3;
 477       if ((int) prec > (int) PREC_PREFIX)
 478         fputs_filtered ("(", stream);
 479       fputs_filtered ("{", stream);
 480       type_print (exp->elts[pc + 2].type, "", stream, 0);
 481       fputs_filtered ("} ", stream);
 482       print_subexp (exp, pos, stream, PREC_PREFIX);
 483       if ((int) prec > (int) PREC_PREFIX)
 484         fputs_filtered (")", stream);
 485       return;
 486
 487     case BINOP_ASSIGN_MODIFY:
 488       opcode = exp->elts[pc + 1].opcode;
 489       (*pos) += 2;
 490       myprec = PREC_ASSIGN;
 491       assoc = 1;
 492       assign_modify = 1;
 493       op_str = "???";
 494       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 495         if (op_print_tab[tem].opcode == opcode)
 496           {
 497             op_str = op_print_tab[tem].string;
 498             break;
 499           }
 500       if (op_print_tab[tem].opcode != opcode)
 501         /* Not found; don't try to keep going because we don't know how
 502            to interpret further elements.  */
 503         error (_("Invalid expression"));
 504       break;
 505
 506       /* C++ ops */
 507
 508     case OP_THIS:
 509       ++(*pos);
 510       if (exp->language_defn->la_name_of_this)
 511         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 512       else
 513         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 514                           exp->language_defn->la_name);
 515       return;
 516
 517       /* Modula-2 ops */
 518
 519     case MULTI_SUBSCRIPT:
 520       (*pos) += 2;
 521       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 522       print_subexp (exp, pos, stream, PREC_SUFFIX);
 523       fprintf_unfiltered (stream, " [");
 524       for (tem = 0; tem < nargs; tem++)
 525         {
 526           if (tem != 0)
 527             fprintf_unfiltered (stream, ", ");
 528           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 529         }
 530       fprintf_unfiltered (stream, "]");
 531       return;
 532
 533     case BINOP_VAL:
 534       (*pos) += 2;
 535       fprintf_unfiltered (stream, "VAL(");
 536       type_print (exp->elts[pc + 1].type, "", stream, 0);
 537       fprintf_unfiltered (stream, ",");
 538       print_subexp (exp, pos, stream, PREC_PREFIX);
 539       fprintf_unfiltered (stream, ")");
 540       return;
 541
 542     case TYPE_INSTANCE:
 543       {
 544         LONGEST count = exp->elts[pc + 1].longconst;
 545
 546         /* The COUNT.  */
 547         (*pos)++;
 548         fputs_unfiltered ("TypesInstance(", stream);
 549         while (count-- > 0)
 550           {
 551             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 552             if (count > 0)
 553               fputs_unfiltered (",", stream);
 554           }
 555         fputs_unfiltered (",", stream);
 556         /* Ending COUNT and ending TYPE_INSTANCE.  */
 557         (*pos) += 2;
 558         print_subexp (exp, pos, stream, PREC_PREFIX);
 559         fputs_unfiltered (")", stream);
 560         return;
 561       }
 562
 563     case OP_F90_RANGE:
 564       {
 565         enum f90_range_type range_type;
 566
 567         range_type = (enum f90_range_type)
 568           longest_to_int (exp->elts[pc + 1].longconst);
 569         *pos += 2;
 570
 571         fputs_filtered ("RANGE(", stream);
 572         if (range_type == HIGH_BOUND_DEFAULT
 573             || range_type == NONE_BOUND_DEFAULT)
 574           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 575         fputs_filtered ("..", stream);
 576         if (range_type == LOW_BOUND_DEFAULT
 577             || range_type == NONE_BOUND_DEFAULT)
 578           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 579         fputs_filtered (")", stream);
 580         return;
 581       }
 582
 583       /* Default ops */
 584
 585     default:
 586       op_str = "???";
 587       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 588         if (op_print_tab[tem].opcode == opcode)
 589           {
 590             op_str = op_print_tab[tem].string;
 591             myprec = op_print_tab[tem].precedence;
 592             assoc = op_print_tab[tem].right_assoc;
 593             break;
 594           }
 595       if (op_print_tab[tem].opcode != opcode)
 596         /* Not found; don't try to keep going because we don't know how
 597            to interpret further elements.  For example, this happens
 598            if opcode is OP_TYPE.  */
 599         error (_("Invalid expression"));
 600     }
 601
 602   /* Note that PREC_BUILTIN will always emit parentheses.  */
 603   if ((int) myprec < (int) prec)
 604     fputs_filtered ("(", stream);
 605   if ((int) opcode > (int) BINOP_END)
 606     {
 607       if (assoc)
 608         {
 609           /* Unary postfix operator.  */
 610           print_subexp (exp, pos, stream, PREC_SUFFIX);
 611           fputs_filtered (op_str, stream);
 612         }
 613       else
 614         {
 615           /* Unary prefix operator.  */
 616           fputs_filtered (op_str, stream);
 617           if (myprec == PREC_BUILTIN_FUNCTION)
 618             fputs_filtered ("(", stream);
 619           print_subexp (exp, pos, stream, PREC_PREFIX);
 620           if (myprec == PREC_BUILTIN_FUNCTION)
 621             fputs_filtered (")", stream);
 622         }
 623     }
 624   else
 625     {
 626       /* Binary operator.  */
 627       /* Print left operand.
 628          If operator is right-associative,
 629          increment precedence for this operand.  */
 630       print_subexp (exp, pos, stream,
 631                     (enum precedence) ((int) myprec + assoc));
 632       /* Print the operator itself.  */
 633       if (assign_modify)
 634         fprintf_filtered (stream, " %s= ", op_str);
 635       else if (op_str[0] == ',')
 636         fprintf_filtered (stream, "%s ", op_str);
 637       else
 638         fprintf_filtered (stream, " %s ", op_str);
 639       /* Print right operand.
 640          If operator is left-associative,
 641          increment precedence for this operand.  */
 642       print_subexp (exp, pos, stream,
 643                     (enum precedence) ((int) myprec + !assoc));
 644     }
 645
 646   if ((int) myprec < (int) prec)
 647     fputs_filtered (")", stream);
 648 }
 649
 650 /* Return the operator corresponding to opcode OP as
 651    a string.   NULL indicates that the opcode was not found in the
 652    current language table.  */
 653 char *
 654 op_string (enum exp_opcode op)
 655 {
 656   int tem;
 657   const struct op_print *op_print_tab;
 658
 659   op_print_tab = current_language->la_op_print_tab;
 660   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 661     if (op_print_tab[tem].opcode == op)
 662       return op_print_tab[tem].string;
 663   return NULL;
 664 }
 665
 666 /* Support for dumping the raw data from expressions in a human readable
 667    form.  */
 668
 669 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 670
 671 /* Name for OPCODE, when it appears in expression EXP.  */
 672
 673 char *
 674 op_name (struct expression *exp, enum exp_opcode opcode)
 675 {
 676   return exp->language_defn->la_exp_desc->op_name (opcode);
 677 }
 678
 679 /* Default name for the standard operator OPCODE (i.e., one defined in
 680    the definition of enum exp_opcode).  */
 681
 682 char *
 683 op_name_standard (enum exp_opcode opcode)
 684 {
 685   switch (opcode)
 686     {
 687     default:
 688       {
 689         static char buf[30];
 690
 691         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 692         return buf;
 693       }
 694 #define OP(name)        \
 695     case name:          \
 696       return #name ;
 697 #include "std-operator.def"
 698 #undef OP
 699     }
 700 }
 701
 702 /* Print a raw dump of expression EXP to STREAM.
 703    NOTE, if non-NULL, is printed as extra explanatory text.  */
 704
 705 void
 706 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 707                      char *note)
 708 {
 709   int elt;
 710   char *opcode_name;
 711   char *eltscan;
 712   int eltsize;
 713
 714   fprintf_filtered (stream, "Dump of expression @ ");
 715   gdb_print_host_address (exp, stream);
 716   if (note)
 717     fprintf_filtered (stream, ", %s:", note);
 718   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 719                     exp->language_defn->la_name, exp->nelts,
 720                     (long) sizeof (union exp_element));
 721   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 722                     "Hex Value", "String Value");
 723   for (elt = 0; elt < exp->nelts; elt++)
 724     {
 725       fprintf_filtered (stream, "\t%5d  ", elt);
 726       opcode_name = op_name (exp, exp->elts[elt].opcode);
 727
 728       fprintf_filtered (stream, "%20s  ", opcode_name);
 729       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 730       fprintf_filtered (stream, "  ");
 731
 732       for (eltscan = (char *) &exp->elts[elt],
 733            eltsize = sizeof (union exp_element);
 734            eltsize-- > 0;
 735            eltscan++)
 736         {
 737           fprintf_filtered (stream, "%c",
 738                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 739         }
 740       fprintf_filtered (stream, "\n");
 741     }
 742 }
 743
 744 /* Dump the subexpression of prefix expression EXP whose operator is at
 745    position ELT onto STREAM.  Returns the position of the next
 746    subexpression in EXP.  */
 747
 748 int
 749 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 750 {
 751   static int indent = 0;
 752   int i;
 753
 754   fprintf_filtered (stream, "\n");
 755   fprintf_filtered (stream, "\t%5d  ", elt);
 756
 757   for (i = 1; i <= indent; i++)
 758     fprintf_filtered (stream, " ");
 759   indent += 2;
 760
 761   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 762
 763   elt = dump_subexp_body (exp, stream, elt);
 764
 765   indent -= 2;
 766
 767   return elt;
 768 }
 769
 770 /* Dump the operands of prefix expression EXP whose opcode is at
 771    position ELT onto STREAM.  Returns the position of the next
 772    subexpression in EXP.  */
 773
 774 static int
 775 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 776 {
 777   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 778 }
 779
 780 /* Default value for subexp_body in exp_descriptor vector.  */
 781
 782 int
 783 dump_subexp_body_standard (struct expression *exp,
 784                            struct ui_file *stream, int elt)
 785 {
 786   int opcode = exp->elts[elt++].opcode;
 787
 788   switch (opcode)
 789     {
 790     case TERNOP_COND:
 791     case TERNOP_SLICE:
 792       elt = dump_subexp (exp, stream, elt);
 793       /* FALL THROUGH */
 794     case BINOP_ADD:
 795     case BINOP_SUB:
 796     case BINOP_MUL:
 797     case BINOP_DIV:
 798     case BINOP_REM:
 799     case BINOP_MOD:
 800     case BINOP_LSH:
 801     case BINOP_RSH:
 802     case BINOP_LOGICAL_AND:
 803     case BINOP_LOGICAL_OR:
 804     case BINOP_BITWISE_AND:
 805     case BINOP_BITWISE_IOR:
 806     case BINOP_BITWISE_XOR:
 807     case BINOP_EQUAL:
 808     case BINOP_NOTEQUAL:
 809     case BINOP_LESS:
 810     case BINOP_GTR:
 811     case BINOP_LEQ:
 812     case BINOP_GEQ:
 813     case BINOP_REPEAT:
 814     case BINOP_ASSIGN:
 815     case BINOP_COMMA:
 816     case BINOP_SUBSCRIPT:
 817     case BINOP_EXP:
 818     case BINOP_MIN:
 819     case BINOP_MAX:
 820     case BINOP_INTDIV:
 821     case BINOP_ASSIGN_MODIFY:
 822     case BINOP_VAL:
 823     case BINOP_CONCAT:
 824     case BINOP_END:
 825     case STRUCTOP_MEMBER:
 826     case STRUCTOP_MPTR:
 827       elt = dump_subexp (exp, stream, elt);
 828       /* FALL THROUGH */
 829     case UNOP_NEG:
 830     case UNOP_LOGICAL_NOT:
 831     case UNOP_COMPLEMENT:
 832     case UNOP_IND:
 833     case UNOP_ADDR:
 834     case UNOP_PREINCREMENT:
 835     case UNOP_POSTINCREMENT:
 836     case UNOP_PREDECREMENT:
 837     case UNOP_POSTDECREMENT:
 838     case UNOP_SIZEOF:
 839     case UNOP_PLUS:
 840     case UNOP_CAP:
 841     case UNOP_CHR:
 842     case UNOP_ORD:
 843     case UNOP_ABS:
 844     case UNOP_FLOAT:
 845     case UNOP_HIGH:
 846     case UNOP_MAX:
 847     case UNOP_MIN:
 848     case UNOP_ODD:
 849     case UNOP_TRUNC:
 850       elt = dump_subexp (exp, stream, elt);
 851       break;
 852     case OP_LONG:
 853       fprintf_filtered (stream, "Type @");
 854       gdb_print_host_address (exp->elts[elt].type, stream);
 855       fprintf_filtered (stream, " (");
 856       type_print (exp->elts[elt].type, NULL, stream, 0);
 857       fprintf_filtered (stream, "), value %ld (0x%lx)",
 858                         (long) exp->elts[elt + 1].longconst,
 859                         (long) exp->elts[elt + 1].longconst);
 860       elt += 3;
 861       break;
 862     case OP_DOUBLE:
 863       fprintf_filtered (stream, "Type @");
 864       gdb_print_host_address (exp->elts[elt].type, stream);
 865       fprintf_filtered (stream, " (");
 866       type_print (exp->elts[elt].type, NULL, stream, 0);
 867       fprintf_filtered (stream, "), value %g",
 868                         (double) exp->elts[elt + 1].doubleconst);
 869       elt += 3;
 870       break;
 871     case OP_VAR_VALUE:
 872       fprintf_filtered (stream, "Block @");
 873       gdb_print_host_address (exp->elts[elt].block, stream);
 874       fprintf_filtered (stream, ", symbol @");
 875       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 876       fprintf_filtered (stream, " (%s)",
 877                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 878       elt += 3;
 879       break;
 880     case OP_VAR_ENTRY_VALUE:
 881       fprintf_filtered (stream, "Entry value of symbol @");
 882       gdb_print_host_address (exp->elts[elt].symbol, stream);
 883       fprintf_filtered (stream, " (%s)",
 884                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 885       elt += 2;
 886       break;
 887     case OP_LAST:
 888       fprintf_filtered (stream, "History element %ld",
 889                         (long) exp->elts[elt].longconst);
 890       elt += 2;
 891       break;
 892     case OP_REGISTER:
 893       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 894       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 895       break;
 896     case OP_INTERNALVAR:
 897       fprintf_filtered (stream, "Internal var @");
 898       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 899       fprintf_filtered (stream, " (%s)",
 900                         internalvar_name (exp->elts[elt].internalvar));
 901       elt += 2;
 902       break;
 903     case OP_FUNCALL:
 904       {
 905         int i, nargs;
 906
 907         nargs = longest_to_int (exp->elts[elt].longconst);
 908
 909         fprintf_filtered (stream, "Number of args: %d", nargs);
 910         elt += 2;
 911
 912         for (i = 1; i <= nargs + 1; i++)
 913           elt = dump_subexp (exp, stream, elt);
 914       }
 915       break;
 916     case OP_ARRAY:
 917       {
 918         int lower, upper;
 919         int i;
 920
 921         lower = longest_to_int (exp->elts[elt].longconst);
 922         upper = longest_to_int (exp->elts[elt + 1].longconst);
 923
 924         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 925         elt += 3;
 926
 927         for (i = 1; i <= upper - lower + 1; i++)
 928           elt = dump_subexp (exp, stream, elt);
 929       }
 930       break;
 931     case UNOP_DYNAMIC_CAST:
 932     case UNOP_REINTERPRET_CAST:
 933     case UNOP_CAST_TYPE:
 934     case UNOP_MEMVAL_TYPE:
 935       fprintf_filtered (stream, " (");
 936       elt = dump_subexp (exp, stream, elt);
 937       fprintf_filtered (stream, ")");
 938       elt = dump_subexp (exp, stream, elt);
 939       break;
 940     case UNOP_MEMVAL:
 941     case UNOP_CAST:
 942       fprintf_filtered (stream, "Type @");
 943       gdb_print_host_address (exp->elts[elt].type, stream);
 944       fprintf_filtered (stream, " (");
 945       type_print (exp->elts[elt].type, NULL, stream, 0);
 946       fprintf_filtered (stream, ")");
 947       elt = dump_subexp (exp, stream, elt + 2);
 948       break;
 949     case UNOP_MEMVAL_TLS:
 950       fprintf_filtered (stream, "TLS type @");
 951       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 952       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 953                         (exp->elts[elt].objfile == NULL ? "(null)"
 954                          : objfile_name (exp->elts[elt].objfile)));
 955       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 956       fprintf_filtered (stream, ")");
 957       elt = dump_subexp (exp, stream, elt + 3);
 958       break;
 959     case OP_TYPE:
 960       fprintf_filtered (stream, "Type @");
 961       gdb_print_host_address (exp->elts[elt].type, stream);
 962       fprintf_filtered (stream, " (");
 963       type_print (exp->elts[elt].type, NULL, stream, 0);
 964       fprintf_filtered (stream, ")");
 965       elt += 2;
 966       break;
 967     case OP_TYPEOF:
 968     case OP_DECLTYPE:
 969       fprintf_filtered (stream, "Typeof (");
 970       elt = dump_subexp (exp, stream, elt);
 971       fprintf_filtered (stream, ")");
 972       break;
 973     case OP_TYPEID:
 974       fprintf_filtered (stream, "typeid (");
 975       elt = dump_subexp (exp, stream, elt);
 976       fprintf_filtered (stream, ")");
 977       break;
 978     case STRUCTOP_STRUCT:
 979     case STRUCTOP_PTR:
 980       {
 981         char *elem_name;
 982         int len;
 983
 984         len = longest_to_int (exp->elts[elt].longconst);
 985         elem_name = &exp->elts[elt + 1].string;
 986
 987         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 988         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 989       }
 990       break;
 991     case OP_SCOPE:
 992       {
 993         char *elem_name;
 994         int len;
 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
1002         len = longest_to_int (exp->elts[elt + 1].longconst);
1003         elem_name = &exp->elts[elt + 2].string;
1004
1005         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1006         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1007       }
1008       break;
1009     case TYPE_INSTANCE:
1010       {
1011         LONGEST len;
1012
1013         len = exp->elts[elt++].longconst;
1014         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
1015         while (len-- > 0)
1016           {
1017             fprintf_filtered (stream, "Type @");
1018             gdb_print_host_address (exp->elts[elt].type, stream);
1019             fprintf_filtered (stream, " (");
1020             type_print (exp->elts[elt].type, NULL, stream, 0);
1021             fprintf_filtered (stream, ")");
1022             elt++;
1023             if (len > 0)
1024               fputs_filtered (", ", stream);
1025           }
1026         /* Ending LEN and ending TYPE_INSTANCE.  */
1027         elt += 2;
1028         elt = dump_subexp (exp, stream, elt);
1029       }
1030       break;
1031     case OP_STRING:
1032       {
1033         LONGEST len = exp->elts[elt].longconst;
1034         LONGEST type = exp->elts[elt + 1].longconst;
1035
1036         fprintf_filtered (stream, "Language-specific string type: %s",
1037                           plongest (type));
1038
1039         /* Skip length.  */
1040         elt += 1;
1041
1042         /* Skip string content. */
1043         elt += BYTES_TO_EXP_ELEM (len);
1044
1045         /* Skip length and ending OP_STRING. */
1046         elt += 2;
1047       }
1048       break;
1049     case OP_F90_RANGE:
1050       {
1051         enum f90_range_type range_type;
1052
1053         range_type = (enum f90_range_type)
1054           longest_to_int (exp->elts[elt].longconst);
1055         elt += 2;
1056
1057         switch (range_type)
1058           {
1059           case BOTH_BOUND_DEFAULT:
1060             fputs_filtered ("Range '..'", stream);
1061             break;
1062           case LOW_BOUND_DEFAULT:
1063             fputs_filtered ("Range '..EXP'", stream);
1064             break;
1065           case HIGH_BOUND_DEFAULT:
1066             fputs_filtered ("Range 'EXP..'", stream);
1067             break;
1068           case NONE_BOUND_DEFAULT:
1069             fputs_filtered ("Range 'EXP..EXP'", stream);
1070             break;
1071           default:
1072             fputs_filtered ("Invalid Range!", stream);
1073             break;
1074           }
1075
1076         if (range_type == HIGH_BOUND_DEFAULT
1077             || range_type == NONE_BOUND_DEFAULT)
1078           elt = dump_subexp (exp, stream, elt);
1079         if (range_type == LOW_BOUND_DEFAULT
1080             || range_type == NONE_BOUND_DEFAULT)
1081           elt = dump_subexp (exp, stream, elt);
1082       }
1083       break;
1084
1085     default:
1086     case OP_NULL:
1087     case MULTI_SUBSCRIPT:
1088     case OP_F77_UNDETERMINED_ARGLIST:
1089     case OP_COMPLEX:
1090     case OP_BOOL:
1091     case OP_M2_STRING:
1092     case OP_THIS:
1093     case OP_NAME:
1094       fprintf_filtered (stream, "Unknown format");
1095     }
1096
1097   return elt;
1098 }
1099
1100 void
1101 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1102 {
1103   int elt;
1104
1105   fprintf_filtered (stream, "Dump of expression @ ");
1106   gdb_print_host_address (exp, stream);
1107   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1108   print_expression (exp, stream);
1109   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1110                     exp->language_defn->la_name, exp->nelts,
1111                     (long) sizeof (union exp_element));
1112   fputs_filtered ("\n", stream);
1113
1114   for (elt = 0; elt < exp->nelts;)
1115     elt = dump_subexp (exp, stream, elt);
1116   fputs_filtered ("\n", stream);
1117 }