gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986-2018 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   const 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_FLOAT:
 109       {
 110         struct value_print_options opts;
 111
 112         get_no_prettyformat_print_options (&opts);
 113         (*pos) += 3;
 114         value_print (value_from_contents (exp->elts[pc + 1].type,
 115                                           exp->elts[pc + 2].floatconst),
 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_MSYM_VALUE:
 138       {
 139         (*pos) += 3;
 140         fputs_filtered (MSYMBOL_PRINT_NAME (exp->elts[pc + 2].msymbol), stream);
 141       }
 142       return;
 143
 144     case OP_FUNC_STATIC_VAR:
 145       {
 146         tem = longest_to_int (exp->elts[pc + 1].longconst);
 147         (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 148         fputs_filtered (&exp->elts[pc + 1].string, stream);
 149       }
 150       return;
 151
 152     case OP_VAR_ENTRY_VALUE:
 153       {
 154         (*pos) += 2;
 155         fprintf_filtered (stream, "%s@entry",
 156                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 157       }
 158       return;
 159
 160     case OP_LAST:
 161       (*pos) += 2;
 162       fprintf_filtered (stream, "$%d",
 163                         longest_to_int (exp->elts[pc + 1].longconst));
 164       return;
 165
 166     case OP_REGISTER:
 167       {
 168         const char *name = &exp->elts[pc + 2].string;
 169
 170         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 171         fprintf_filtered (stream, "$%s", name);
 172         return;
 173       }
 174
 175     case OP_BOOL:
 176       (*pos) += 2;
 177       fprintf_filtered (stream, "%s",
 178                         longest_to_int (exp->elts[pc + 1].longconst)
 179                         ? "TRUE" : "FALSE");
 180       return;
 181
 182     case OP_INTERNALVAR:
 183       (*pos) += 2;
 184       fprintf_filtered (stream, "$%s",
 185                         internalvar_name (exp->elts[pc + 1].internalvar));
 186       return;
 187
 188     case OP_FUNCALL:
 189     case OP_F77_UNDETERMINED_ARGLIST:
 190       (*pos) += 2;
 191       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 192       print_subexp (exp, pos, stream, PREC_SUFFIX);
 193       fputs_filtered (" (", stream);
 194       for (tem = 0; tem < nargs; tem++)
 195         {
 196           if (tem != 0)
 197             fputs_filtered (", ", stream);
 198           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 199         }
 200       fputs_filtered (")", stream);
 201       return;
 202
 203     case OP_NAME:
 204       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 205       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 206       fputs_filtered (&exp->elts[pc + 2].string, stream);
 207       return;
 208
 209     case OP_STRING:
 210       {
 211         struct value_print_options opts;
 212
 213         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 214         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 215         /* LA_PRINT_STRING will print using the current repeat count threshold.
 216            If necessary, we can temporarily set it to zero, or pass it as an
 217            additional parameter to LA_PRINT_STRING.  -fnf */
 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       }
 223       return;
 224
 225     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 226                                    NSString constant.  */
 227       {
 228         struct value_print_options opts;
 229
 230         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 231         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 232         fputs_filtered ("@\"", stream);
 233         get_user_print_options (&opts);
 234         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 235                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 236                          NULL, 0, &opts);
 237         fputs_filtered ("\"", stream);
 238       }
 239       return;
 240
 241     case OP_OBJC_MSGCALL:
 242       {                 /* Objective C message (method) call.  */
 243         char *selector;
 244
 245         (*pos) += 3;
 246         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 247         fprintf_unfiltered (stream, "[");
 248         print_subexp (exp, pos, stream, PREC_SUFFIX);
 249         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 250                                      &selector, 1024, NULL))
 251           {
 252             error (_("bad selector"));
 253             return;
 254           }
 255         if (nargs)
 256           {
 257             char *s, *nextS;
 258
 259             s = (char *) alloca (strlen (selector) + 1);
 260             strcpy (s, selector);
 261             for (tem = 0; tem < nargs; tem++)
 262               {
 263                 nextS = strchr (s, ':');
 264                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 265                 *nextS = '\0';
 266                 fprintf_unfiltered (stream, " %s: ", s);
 267                 s = nextS + 1;
 268                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 269               }
 270           }
 271         else
 272           {
 273             fprintf_unfiltered (stream, " %s", selector);
 274           }
 275         fprintf_unfiltered (stream, "]");
 276         /* "selector" was malloc'd by target_read_string.  Free it.  */
 277         xfree (selector);
 278         return;
 279       }
 280
 281     case OP_ARRAY:
 282       (*pos) += 3;
 283       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 284       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 285       nargs++;
 286       tem = 0;
 287       if (exp->elts[pc + 4].opcode == OP_LONG
 288           && exp->elts[pc + 5].type
 289              == builtin_type (exp->gdbarch)->builtin_char
 290           && exp->language_defn->la_language == language_c)
 291         {
 292           /* Attempt to print C character arrays using string syntax.
 293              Walk through the args, picking up one character from each
 294              of the OP_LONG expression elements.  If any array element
 295              does not match our expection of what we should find for
 296              a simple string, revert back to array printing.  Note that
 297              the last expression element is an explicit null terminator
 298              byte, which doesn't get printed.  */
 299           tempstr = (char *) alloca (nargs);
 300           pc += 4;
 301           while (tem < nargs)
 302             {
 303               if (exp->elts[pc].opcode != OP_LONG
 304                   || exp->elts[pc + 1].type
 305                      != builtin_type (exp->gdbarch)->builtin_char)
 306                 {
 307                   /* Not a simple array of char, use regular array
 308                      printing.  */
 309                   tem = 0;
 310                   break;
 311                 }
 312               else
 313                 {
 314                   tempstr[tem++] =
 315                     longest_to_int (exp->elts[pc + 2].longconst);
 316                   pc += 4;
 317                 }
 318             }
 319         }
 320       if (tem > 0)
 321         {
 322           struct value_print_options opts;
 323
 324           get_user_print_options (&opts);
 325           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 326                            (gdb_byte *) tempstr, nargs - 1, NULL, 0, &opts);
 327           (*pos) = pc;
 328         }
 329       else
 330         {
 331           fputs_filtered (" {", stream);
 332           for (tem = 0; tem < nargs; tem++)
 333             {
 334               if (tem != 0)
 335                 {
 336                   fputs_filtered (", ", stream);
 337                 }
 338               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 339             }
 340           fputs_filtered ("}", stream);
 341         }
 342       return;
 343
 344     case TERNOP_COND:
 345       if ((int) prec > (int) PREC_COMMA)
 346         fputs_filtered ("(", stream);
 347       /* Print the subexpressions, forcing parentheses
 348          around any binary operations within them.
 349          This is more parentheses than are strictly necessary,
 350          but it looks clearer.  */
 351       print_subexp (exp, pos, stream, PREC_HYPER);
 352       fputs_filtered (" ? ", stream);
 353       print_subexp (exp, pos, stream, PREC_HYPER);
 354       fputs_filtered (" : ", stream);
 355       print_subexp (exp, pos, stream, PREC_HYPER);
 356       if ((int) prec > (int) PREC_COMMA)
 357         fputs_filtered (")", stream);
 358       return;
 359
 360     case TERNOP_SLICE:
 361       print_subexp (exp, pos, stream, PREC_SUFFIX);
 362       fputs_filtered ("(", stream);
 363       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 364       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 365       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 366       fputs_filtered (")", stream);
 367       return;
 368
 369     case STRUCTOP_STRUCT:
 370       tem = longest_to_int (exp->elts[pc + 1].longconst);
 371       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 372       print_subexp (exp, pos, stream, PREC_SUFFIX);
 373       fputs_filtered (".", stream);
 374       fputs_filtered (&exp->elts[pc + 2].string, stream);
 375       return;
 376
 377       /* Will not occur for Modula-2.  */
 378     case STRUCTOP_PTR:
 379       tem = longest_to_int (exp->elts[pc + 1].longconst);
 380       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 381       print_subexp (exp, pos, stream, PREC_SUFFIX);
 382       fputs_filtered ("->", stream);
 383       fputs_filtered (&exp->elts[pc + 2].string, stream);
 384       return;
 385
 386     case STRUCTOP_MEMBER:
 387       print_subexp (exp, pos, stream, PREC_SUFFIX);
 388       fputs_filtered (".*", stream);
 389       print_subexp (exp, pos, stream, PREC_SUFFIX);
 390       return;
 391
 392     case STRUCTOP_MPTR:
 393       print_subexp (exp, pos, stream, PREC_SUFFIX);
 394       fputs_filtered ("->*", stream);
 395       print_subexp (exp, pos, stream, PREC_SUFFIX);
 396       return;
 397
 398     case BINOP_SUBSCRIPT:
 399       print_subexp (exp, pos, stream, PREC_SUFFIX);
 400       fputs_filtered ("[", stream);
 401       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 402       fputs_filtered ("]", stream);
 403       return;
 404
 405     case UNOP_POSTINCREMENT:
 406       print_subexp (exp, pos, stream, PREC_SUFFIX);
 407       fputs_filtered ("++", stream);
 408       return;
 409
 410     case UNOP_POSTDECREMENT:
 411       print_subexp (exp, pos, stream, PREC_SUFFIX);
 412       fputs_filtered ("--", stream);
 413       return;
 414
 415     case UNOP_CAST:
 416       (*pos) += 2;
 417       if ((int) prec > (int) PREC_PREFIX)
 418         fputs_filtered ("(", stream);
 419       fputs_filtered ("(", stream);
 420       type_print (exp->elts[pc + 1].type, "", stream, 0);
 421       fputs_filtered (") ", stream);
 422       print_subexp (exp, pos, stream, PREC_PREFIX);
 423       if ((int) prec > (int) PREC_PREFIX)
 424         fputs_filtered (")", stream);
 425       return;
 426
 427     case UNOP_CAST_TYPE:
 428       if ((int) prec > (int) PREC_PREFIX)
 429         fputs_filtered ("(", stream);
 430       fputs_filtered ("(", stream);
 431       print_subexp (exp, pos, stream, PREC_PREFIX);
 432       fputs_filtered (") ", stream);
 433       print_subexp (exp, pos, stream, PREC_PREFIX);
 434       if ((int) prec > (int) PREC_PREFIX)
 435         fputs_filtered (")", stream);
 436       return;
 437
 438     case UNOP_DYNAMIC_CAST:
 439     case UNOP_REINTERPRET_CAST:
 440       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 441                       : "reinterpret_cast", stream);
 442       fputs_filtered ("<", stream);
 443       print_subexp (exp, pos, stream, PREC_PREFIX);
 444       fputs_filtered ("> (", stream);
 445       print_subexp (exp, pos, stream, PREC_PREFIX);
 446       fputs_filtered (")", stream);
 447       return;
 448
 449     case UNOP_MEMVAL:
 450       (*pos) += 2;
 451       if ((int) prec > (int) PREC_PREFIX)
 452         fputs_filtered ("(", stream);
 453       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 454           && exp->elts[pc + 3].opcode == OP_LONG)
 455         {
 456           struct value_print_options opts;
 457
 458           /* We have a minimal symbol fn, probably.  It's encoded
 459              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 460              Swallow the OP_LONG (including both its opcodes); ignore
 461              its type; print the value in the type of the MEMVAL.  */
 462           (*pos) += 4;
 463           val = value_at_lazy (exp->elts[pc + 1].type,
 464                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 465           get_no_prettyformat_print_options (&opts);
 466           value_print (val, stream, &opts);
 467         }
 468       else
 469         {
 470           fputs_filtered ("{", stream);
 471           type_print (exp->elts[pc + 1].type, "", stream, 0);
 472           fputs_filtered ("} ", stream);
 473           print_subexp (exp, pos, stream, PREC_PREFIX);
 474         }
 475       if ((int) prec > (int) PREC_PREFIX)
 476         fputs_filtered (")", stream);
 477       return;
 478
 479     case UNOP_MEMVAL_TYPE:
 480       if ((int) prec > (int) PREC_PREFIX)
 481         fputs_filtered ("(", stream);
 482       fputs_filtered ("{", stream);
 483       print_subexp (exp, pos, stream, PREC_PREFIX);
 484       fputs_filtered ("} ", stream);
 485       print_subexp (exp, pos, stream, PREC_PREFIX);
 486       if ((int) prec > (int) PREC_PREFIX)
 487         fputs_filtered (")", stream);
 488       return;
 489
 490     case BINOP_ASSIGN_MODIFY:
 491       opcode = exp->elts[pc + 1].opcode;
 492       (*pos) += 2;
 493       myprec = PREC_ASSIGN;
 494       assoc = 1;
 495       assign_modify = 1;
 496       op_str = "???";
 497       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 498         if (op_print_tab[tem].opcode == opcode)
 499           {
 500             op_str = op_print_tab[tem].string;
 501             break;
 502           }
 503       if (op_print_tab[tem].opcode != opcode)
 504         /* Not found; don't try to keep going because we don't know how
 505            to interpret further elements.  */
 506         error (_("Invalid expression"));
 507       break;
 508
 509       /* C++ ops */
 510
 511     case OP_THIS:
 512       ++(*pos);
 513       if (exp->language_defn->la_name_of_this)
 514         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 515       else
 516         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 517                           exp->language_defn->la_name);
 518       return;
 519
 520       /* Modula-2 ops */
 521
 522     case MULTI_SUBSCRIPT:
 523       (*pos) += 2;
 524       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 525       print_subexp (exp, pos, stream, PREC_SUFFIX);
 526       fprintf_unfiltered (stream, " [");
 527       for (tem = 0; tem < nargs; tem++)
 528         {
 529           if (tem != 0)
 530             fprintf_unfiltered (stream, ", ");
 531           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 532         }
 533       fprintf_unfiltered (stream, "]");
 534       return;
 535
 536     case BINOP_VAL:
 537       (*pos) += 2;
 538       fprintf_unfiltered (stream, "VAL(");
 539       type_print (exp->elts[pc + 1].type, "", stream, 0);
 540       fprintf_unfiltered (stream, ",");
 541       print_subexp (exp, pos, stream, PREC_PREFIX);
 542       fprintf_unfiltered (stream, ")");
 543       return;
 544
 545     case TYPE_INSTANCE:
 546       {
 547         type_instance_flags flags
 548           = (type_instance_flag_value) longest_to_int (exp->elts[pc + 1].longconst);
 549         LONGEST count = exp->elts[pc + 2].longconst;
 550
 551         /* The FLAGS.  */
 552         (*pos)++;
 553         /* The COUNT.  */
 554         (*pos)++;
 555         fputs_unfiltered ("TypeInstance(", stream);
 556         while (count-- > 0)
 557           {
 558             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 559             if (count > 0)
 560               fputs_unfiltered (",", stream);
 561           }
 562         fputs_unfiltered (",", stream);
 563         /* Ending COUNT and ending TYPE_INSTANCE.  */
 564         (*pos) += 2;
 565         print_subexp (exp, pos, stream, PREC_PREFIX);
 566
 567         if (flags & TYPE_INSTANCE_FLAG_CONST)
 568           fputs_unfiltered (",const", stream);
 569         if (flags & TYPE_INSTANCE_FLAG_VOLATILE)
 570           fputs_unfiltered (",volatile", stream);
 571
 572         fputs_unfiltered (")", stream);
 573         return;
 574       }
 575
 576     case OP_RANGE:
 577       {
 578         enum range_type range_type;
 579
 580         range_type = (enum range_type)
 581           longest_to_int (exp->elts[pc + 1].longconst);
 582         *pos += 2;
 583
 584         fputs_filtered ("RANGE(", stream);
 585         if (range_type == HIGH_BOUND_DEFAULT
 586             || range_type == NONE_BOUND_DEFAULT)
 587           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 588         fputs_filtered ("..", stream);
 589         if (range_type == LOW_BOUND_DEFAULT
 590             || range_type == NONE_BOUND_DEFAULT)
 591           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 592         fputs_filtered (")", stream);
 593         return;
 594       }
 595
 596       /* Default ops */
 597
 598     default:
 599       op_str = "???";
 600       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 601         if (op_print_tab[tem].opcode == opcode)
 602           {
 603             op_str = op_print_tab[tem].string;
 604             myprec = op_print_tab[tem].precedence;
 605             assoc = op_print_tab[tem].right_assoc;
 606             break;
 607           }
 608       if (op_print_tab[tem].opcode != opcode)
 609         /* Not found; don't try to keep going because we don't know how
 610            to interpret further elements.  For example, this happens
 611            if opcode is OP_TYPE.  */
 612         error (_("Invalid expression"));
 613     }
 614
 615   /* Note that PREC_BUILTIN will always emit parentheses.  */
 616   if ((int) myprec < (int) prec)
 617     fputs_filtered ("(", stream);
 618   if ((int) opcode > (int) BINOP_END)
 619     {
 620       if (assoc)
 621         {
 622           /* Unary postfix operator.  */
 623           print_subexp (exp, pos, stream, PREC_SUFFIX);
 624           fputs_filtered (op_str, stream);
 625         }
 626       else
 627         {
 628           /* Unary prefix operator.  */
 629           fputs_filtered (op_str, stream);
 630           if (myprec == PREC_BUILTIN_FUNCTION)
 631             fputs_filtered ("(", stream);
 632           print_subexp (exp, pos, stream, PREC_PREFIX);
 633           if (myprec == PREC_BUILTIN_FUNCTION)
 634             fputs_filtered (")", stream);
 635         }
 636     }
 637   else
 638     {
 639       /* Binary operator.  */
 640       /* Print left operand.
 641          If operator is right-associative,
 642          increment precedence for this operand.  */
 643       print_subexp (exp, pos, stream,
 644                     (enum precedence) ((int) myprec + assoc));
 645       /* Print the operator itself.  */
 646       if (assign_modify)
 647         fprintf_filtered (stream, " %s= ", op_str);
 648       else if (op_str[0] == ',')
 649         fprintf_filtered (stream, "%s ", op_str);
 650       else
 651         fprintf_filtered (stream, " %s ", op_str);
 652       /* Print right operand.
 653          If operator is left-associative,
 654          increment precedence for this operand.  */
 655       print_subexp (exp, pos, stream,
 656                     (enum precedence) ((int) myprec + !assoc));
 657     }
 658
 659   if ((int) myprec < (int) prec)
 660     fputs_filtered (")", stream);
 661 }
 662
 663 /* Return the operator corresponding to opcode OP as
 664    a string.   NULL indicates that the opcode was not found in the
 665    current language table.  */
 666 const char *
 667 op_string (enum exp_opcode op)
 668 {
 669   int tem;
 670   const struct op_print *op_print_tab;
 671
 672   op_print_tab = current_language->la_op_print_tab;
 673   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 674     if (op_print_tab[tem].opcode == op)
 675       return op_print_tab[tem].string;
 676   return NULL;
 677 }
 678
 679 /* Support for dumping the raw data from expressions in a human readable
 680    form.  */
 681
 682 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 683
 684 /* Name for OPCODE, when it appears in expression EXP.  */
 685
 686 const char *
 687 op_name (struct expression *exp, enum exp_opcode opcode)
 688 {
 689   return exp->language_defn->la_exp_desc->op_name (opcode);
 690 }
 691
 692 /* Default name for the standard operator OPCODE (i.e., one defined in
 693    the definition of enum exp_opcode).  */
 694
 695 const char *
 696 op_name_standard (enum exp_opcode opcode)
 697 {
 698   switch (opcode)
 699     {
 700     default:
 701       {
 702         static char buf[30];
 703
 704         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 705         return buf;
 706       }
 707 #define OP(name)        \
 708     case name:          \
 709       return #name ;
 710 #include "std-operator.def"
 711 #undef OP
 712     }
 713 }
 714
 715 /* Print a raw dump of expression EXP to STREAM.
 716    NOTE, if non-NULL, is printed as extra explanatory text.  */
 717
 718 void
 719 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 720                      const char *note)
 721 {
 722   int elt;
 723   char *eltscan;
 724   int eltsize;
 725
 726   fprintf_filtered (stream, "Dump of expression @ ");
 727   gdb_print_host_address (exp, stream);
 728   if (note)
 729     fprintf_filtered (stream, ", %s:", note);
 730   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 731                     exp->language_defn->la_name, exp->nelts,
 732                     (long) sizeof (union exp_element));
 733   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 734                     "Hex Value", "String Value");
 735   for (elt = 0; elt < exp->nelts; elt++)
 736     {
 737       fprintf_filtered (stream, "\t%5d  ", elt);
 738
 739       const char *opcode_name = op_name (exp, exp->elts[elt].opcode);
 740       fprintf_filtered (stream, "%20s  ", opcode_name);
 741
 742       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 743       fprintf_filtered (stream, "  ");
 744
 745       for (eltscan = (char *) &exp->elts[elt],
 746            eltsize = sizeof (union exp_element);
 747            eltsize-- > 0;
 748            eltscan++)
 749         {
 750           fprintf_filtered (stream, "%c",
 751                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 752         }
 753       fprintf_filtered (stream, "\n");
 754     }
 755 }
 756
 757 /* Dump the subexpression of prefix expression EXP whose operator is at
 758    position ELT onto STREAM.  Returns the position of the next
 759    subexpression in EXP.  */
 760
 761 int
 762 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 763 {
 764   static int indent = 0;
 765   int i;
 766
 767   fprintf_filtered (stream, "\n");
 768   fprintf_filtered (stream, "\t%5d  ", elt);
 769
 770   for (i = 1; i <= indent; i++)
 771     fprintf_filtered (stream, " ");
 772   indent += 2;
 773
 774   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 775
 776   elt = dump_subexp_body (exp, stream, elt);
 777
 778   indent -= 2;
 779
 780   return elt;
 781 }
 782
 783 /* Dump the operands of prefix expression EXP whose opcode is at
 784    position ELT onto STREAM.  Returns the position of the next
 785    subexpression in EXP.  */
 786
 787 static int
 788 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 789 {
 790   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 791 }
 792
 793 /* Default value for subexp_body in exp_descriptor vector.  */
 794
 795 int
 796 dump_subexp_body_standard (struct expression *exp,
 797                            struct ui_file *stream, int elt)
 798 {
 799   int opcode = exp->elts[elt++].opcode;
 800
 801   switch (opcode)
 802     {
 803     case TERNOP_COND:
 804     case TERNOP_SLICE:
 805       elt = dump_subexp (exp, stream, elt);
 806       /* FALL THROUGH */
 807     case BINOP_ADD:
 808     case BINOP_SUB:
 809     case BINOP_MUL:
 810     case BINOP_DIV:
 811     case BINOP_REM:
 812     case BINOP_MOD:
 813     case BINOP_LSH:
 814     case BINOP_RSH:
 815     case BINOP_LOGICAL_AND:
 816     case BINOP_LOGICAL_OR:
 817     case BINOP_BITWISE_AND:
 818     case BINOP_BITWISE_IOR:
 819     case BINOP_BITWISE_XOR:
 820     case BINOP_EQUAL:
 821     case BINOP_NOTEQUAL:
 822     case BINOP_LESS:
 823     case BINOP_GTR:
 824     case BINOP_LEQ:
 825     case BINOP_GEQ:
 826     case BINOP_REPEAT:
 827     case BINOP_ASSIGN:
 828     case BINOP_COMMA:
 829     case BINOP_SUBSCRIPT:
 830     case BINOP_EXP:
 831     case BINOP_MIN:
 832     case BINOP_MAX:
 833     case BINOP_INTDIV:
 834     case BINOP_ASSIGN_MODIFY:
 835     case BINOP_VAL:
 836     case BINOP_CONCAT:
 837     case BINOP_END:
 838     case STRUCTOP_MEMBER:
 839     case STRUCTOP_MPTR:
 840       elt = dump_subexp (exp, stream, elt);
 841       /* FALL THROUGH */
 842     case UNOP_NEG:
 843     case UNOP_LOGICAL_NOT:
 844     case UNOP_COMPLEMENT:
 845     case UNOP_IND:
 846     case UNOP_ADDR:
 847     case UNOP_PREINCREMENT:
 848     case UNOP_POSTINCREMENT:
 849     case UNOP_PREDECREMENT:
 850     case UNOP_POSTDECREMENT:
 851     case UNOP_SIZEOF:
 852     case UNOP_PLUS:
 853     case UNOP_CAP:
 854     case UNOP_CHR:
 855     case UNOP_ORD:
 856     case UNOP_ABS:
 857     case UNOP_FLOAT:
 858     case UNOP_HIGH:
 859     case UNOP_MAX:
 860     case UNOP_MIN:
 861     case UNOP_ODD:
 862     case UNOP_TRUNC:
 863       elt = dump_subexp (exp, stream, elt);
 864       break;
 865     case OP_LONG:
 866       fprintf_filtered (stream, "Type @");
 867       gdb_print_host_address (exp->elts[elt].type, stream);
 868       fprintf_filtered (stream, " (");
 869       type_print (exp->elts[elt].type, NULL, stream, 0);
 870       fprintf_filtered (stream, "), value %ld (0x%lx)",
 871                         (long) exp->elts[elt + 1].longconst,
 872                         (long) exp->elts[elt + 1].longconst);
 873       elt += 3;
 874       break;
 875     case OP_FLOAT:
 876       fprintf_filtered (stream, "Type @");
 877       gdb_print_host_address (exp->elts[elt].type, stream);
 878       fprintf_filtered (stream, " (");
 879       type_print (exp->elts[elt].type, NULL, stream, 0);
 880       fprintf_filtered (stream, "), value ");
 881       print_floating (exp->elts[elt + 1].floatconst,
 882                       exp->elts[elt].type, stream);
 883       elt += 3;
 884       break;
 885     case OP_VAR_VALUE:
 886       fprintf_filtered (stream, "Block @");
 887       gdb_print_host_address (exp->elts[elt].block, stream);
 888       fprintf_filtered (stream, ", symbol @");
 889       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 890       fprintf_filtered (stream, " (%s)",
 891                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 892       elt += 3;
 893       break;
 894     case OP_VAR_MSYM_VALUE:
 895       fprintf_filtered (stream, "Objfile @");
 896       gdb_print_host_address (exp->elts[elt].objfile, stream);
 897       fprintf_filtered (stream, ", msymbol @");
 898       gdb_print_host_address (exp->elts[elt + 1].msymbol, stream);
 899       fprintf_filtered (stream, " (%s)",
 900                         MSYMBOL_PRINT_NAME (exp->elts[elt + 1].msymbol));
 901       elt += 3;
 902       break;
 903     case OP_VAR_ENTRY_VALUE:
 904       fprintf_filtered (stream, "Entry value of symbol @");
 905       gdb_print_host_address (exp->elts[elt].symbol, stream);
 906       fprintf_filtered (stream, " (%s)",
 907                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 908       elt += 2;
 909       break;
 910     case OP_LAST:
 911       fprintf_filtered (stream, "History element %ld",
 912                         (long) exp->elts[elt].longconst);
 913       elt += 2;
 914       break;
 915     case OP_REGISTER:
 916       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 917       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 918       break;
 919     case OP_INTERNALVAR:
 920       fprintf_filtered (stream, "Internal var @");
 921       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 922       fprintf_filtered (stream, " (%s)",
 923                         internalvar_name (exp->elts[elt].internalvar));
 924       elt += 2;
 925       break;
 926     case OP_FUNCALL:
 927     case OP_F77_UNDETERMINED_ARGLIST:
 928       {
 929         int i, nargs;
 930
 931         nargs = longest_to_int (exp->elts[elt].longconst);
 932
 933         fprintf_filtered (stream, "Number of args: %d", nargs);
 934         elt += 2;
 935
 936         for (i = 1; i <= nargs + 1; i++)
 937           elt = dump_subexp (exp, stream, elt);
 938       }
 939       break;
 940     case OP_ARRAY:
 941       {
 942         int lower, upper;
 943         int i;
 944
 945         lower = longest_to_int (exp->elts[elt].longconst);
 946         upper = longest_to_int (exp->elts[elt + 1].longconst);
 947
 948         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 949         elt += 3;
 950
 951         for (i = 1; i <= upper - lower + 1; i++)
 952           elt = dump_subexp (exp, stream, elt);
 953       }
 954       break;
 955     case UNOP_DYNAMIC_CAST:
 956     case UNOP_REINTERPRET_CAST:
 957     case UNOP_CAST_TYPE:
 958     case UNOP_MEMVAL_TYPE:
 959       fprintf_filtered (stream, " (");
 960       elt = dump_subexp (exp, stream, elt);
 961       fprintf_filtered (stream, ")");
 962       elt = dump_subexp (exp, stream, elt);
 963       break;
 964     case UNOP_MEMVAL:
 965     case UNOP_CAST:
 966       fprintf_filtered (stream, "Type @");
 967       gdb_print_host_address (exp->elts[elt].type, stream);
 968       fprintf_filtered (stream, " (");
 969       type_print (exp->elts[elt].type, NULL, stream, 0);
 970       fprintf_filtered (stream, ")");
 971       elt = dump_subexp (exp, stream, elt + 2);
 972       break;
 973     case OP_TYPE:
 974       fprintf_filtered (stream, "Type @");
 975       gdb_print_host_address (exp->elts[elt].type, stream);
 976       fprintf_filtered (stream, " (");
 977       type_print (exp->elts[elt].type, NULL, stream, 0);
 978       fprintf_filtered (stream, ")");
 979       elt += 2;
 980       break;
 981     case OP_TYPEOF:
 982     case OP_DECLTYPE:
 983       fprintf_filtered (stream, "Typeof (");
 984       elt = dump_subexp (exp, stream, elt);
 985       fprintf_filtered (stream, ")");
 986       break;
 987     case OP_TYPEID:
 988       fprintf_filtered (stream, "typeid (");
 989       elt = dump_subexp (exp, stream, elt);
 990       fprintf_filtered (stream, ")");
 991       break;
 992     case STRUCTOP_STRUCT:
 993     case STRUCTOP_PTR:
 994       {
 995         char *elem_name;
 996         int len;
 997
 998         len = longest_to_int (exp->elts[elt].longconst);
 999         elem_name = &exp->elts[elt + 1].string;
1000
1001         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1002         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1003       }
1004       break;
1005     case OP_SCOPE:
1006       {
1007         char *elem_name;
1008         int len;
1009
1010         fprintf_filtered (stream, "Type @");
1011         gdb_print_host_address (exp->elts[elt].type, stream);
1012         fprintf_filtered (stream, " (");
1013         type_print (exp->elts[elt].type, NULL, stream, 0);
1014         fprintf_filtered (stream, ") ");
1015
1016         len = longest_to_int (exp->elts[elt + 1].longconst);
1017         elem_name = &exp->elts[elt + 2].string;
1018
1019         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1020         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1021       }
1022       break;
1023
1024     case OP_FUNC_STATIC_VAR:
1025       {
1026         int len = longest_to_int (exp->elts[elt].longconst);
1027         const char *var_name = &exp->elts[elt + 1].string;
1028         fprintf_filtered (stream, "Field name: `%.*s'", len, var_name);
1029         elt += 3 + BYTES_TO_EXP_ELEM (len + 1);
1030       }
1031       break;
1032
1033     case TYPE_INSTANCE:
1034       {
1035         type_instance_flags flags
1036           = (type_instance_flag_value) longest_to_int (exp->elts[elt++].longconst);
1037         LONGEST len = exp->elts[elt++].longconst;
1038         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
1039         while (len-- > 0)
1040           {
1041             fprintf_filtered (stream, "Type @");
1042             gdb_print_host_address (exp->elts[elt].type, stream);
1043             fprintf_filtered (stream, " (");
1044             type_print (exp->elts[elt].type, NULL, stream, 0);
1045             fprintf_filtered (stream, ")");
1046             elt++;
1047             if (len > 0)
1048               fputs_filtered (", ", stream);
1049           }
1050
1051         fprintf_filtered (stream, " Flags: %s (", hex_string (flags));
1052         bool space = false;
1053         auto print_one = [&] (const char *mod)
1054           {
1055             if (space)
1056               fputs_filtered (" ", stream);
1057             space = true;
1058             fprintf_filtered (stream, "%s", mod);
1059           };
1060         if (flags & TYPE_INSTANCE_FLAG_CONST)
1061           print_one ("const");
1062         if (flags & TYPE_INSTANCE_FLAG_VOLATILE)
1063           print_one ("volatile");
1064         fprintf_filtered (stream, ")");
1065
1066         /* Ending LEN and ending TYPE_INSTANCE.  */
1067         elt += 2;
1068         elt = dump_subexp (exp, stream, elt);
1069       }
1070       break;
1071     case OP_STRING:
1072       {
1073         LONGEST len = exp->elts[elt].longconst;
1074         LONGEST type = exp->elts[elt + 1].longconst;
1075
1076         fprintf_filtered (stream, "Language-specific string type: %s",
1077                           plongest (type));
1078
1079         /* Skip length.  */
1080         elt += 1;
1081
1082         /* Skip string content. */
1083         elt += BYTES_TO_EXP_ELEM (len);
1084
1085         /* Skip length and ending OP_STRING. */
1086         elt += 2;
1087       }
1088       break;
1089     case OP_RANGE:
1090       {
1091         enum range_type range_type;
1092
1093         range_type = (enum range_type)
1094           longest_to_int (exp->elts[elt].longconst);
1095         elt += 2;
1096
1097         switch (range_type)
1098           {
1099           case BOTH_BOUND_DEFAULT:
1100             fputs_filtered ("Range '..'", stream);
1101             break;
1102           case LOW_BOUND_DEFAULT:
1103             fputs_filtered ("Range '..EXP'", stream);
1104             break;
1105           case HIGH_BOUND_DEFAULT:
1106             fputs_filtered ("Range 'EXP..'", stream);
1107             break;
1108           case NONE_BOUND_DEFAULT:
1109             fputs_filtered ("Range 'EXP..EXP'", stream);
1110             break;
1111           default:
1112             fputs_filtered ("Invalid Range!", stream);
1113             break;
1114           }
1115
1116         if (range_type == HIGH_BOUND_DEFAULT
1117             || range_type == NONE_BOUND_DEFAULT)
1118           elt = dump_subexp (exp, stream, elt);
1119         if (range_type == LOW_BOUND_DEFAULT
1120             || range_type == NONE_BOUND_DEFAULT)
1121           elt = dump_subexp (exp, stream, elt);
1122       }
1123       break;
1124
1125     default:
1126     case OP_NULL:
1127     case MULTI_SUBSCRIPT:
1128     case OP_COMPLEX:
1129     case OP_BOOL:
1130     case OP_M2_STRING:
1131     case OP_THIS:
1132     case OP_NAME:
1133       fprintf_filtered (stream, "Unknown format");
1134     }
1135
1136   return elt;
1137 }
1138
1139 void
1140 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1141 {
1142   int elt;
1143
1144   fprintf_filtered (stream, "Dump of expression @ ");
1145   gdb_print_host_address (exp, stream);
1146   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1147   print_expression (exp, stream);
1148   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1149                     exp->language_defn->la_name, exp->nelts,
1150                     (long) sizeof (union exp_element));
1151   fputs_filtered ("\n", stream);
1152
1153   for (elt = 0; elt < exp->nelts;)
1154     elt = dump_subexp (exp, stream, elt);
1155   fputs_filtered ("\n", stream);
1156 }