gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986-2019 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
  22 /* Standard C includes.  */
  23 #include <ctype.h>
  24
  25 /* Local non-gdb includes.  */
  26 #include "block.h"
  27 #include "expression.h"
  28 #include "gdbtypes.h"
  29 #include "language.h"
  30 #include "objfiles.h"
  31 #include "parser-defs.h"
  32 #include "symtab.h"
  33 #include "target.h"
  34 #include "user-regs.h"
  35 #include "valprint.h"
  36 #include "value.h"
  37
  38 void
  39 print_expression (struct expression *exp, struct ui_file *stream)
  40 {
  41   int pc = 0;
  42
  43   print_subexp (exp, &pc, stream, PREC_NULL);
  44 }
  45
  46 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  47    PREC is the precedence of the surrounding operator;
  48    if the precedence of the main operator of this subexpression is less,
  49    parentheses are needed here.  */
  50
  51 void
  52 print_subexp (struct expression *exp, int *pos,
  53               struct ui_file *stream, enum precedence prec)
  54 {
  55   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  56 }
  57
  58 /* Standard implementation of print_subexp for use in language_defn
  59    vectors.  */
  60 void
  61 print_subexp_standard (struct expression *exp, int *pos,
  62                        struct ui_file *stream, enum precedence prec)
  63 {
  64   unsigned tem;
  65   const struct op_print *op_print_tab;
  66   int pc;
  67   unsigned nargs;
  68   const char *op_str;
  69   int assign_modify = 0;
  70   enum exp_opcode opcode;
  71   enum precedence myprec = PREC_NULL;
  72   /* Set to 1 for a right-associative operator.  */
  73   int assoc = 0;
  74   struct value *val;
  75   char *tempstr = NULL;
  76
  77   op_print_tab = exp->language_defn->la_op_print_tab;
  78   pc = (*pos)++;
  79   opcode = exp->elts[pc].opcode;
  80   switch (opcode)
  81     {
  82       /* Common ops */
  83
  84     case OP_TYPE:
  85       (*pos) += 2;
  86       type_print (exp->elts[pc + 1].type, "", stream, 0);
  87       return;
  88
  89     case OP_SCOPE:
  90       myprec = PREC_PREFIX;
  91       assoc = 0;
  92       fputs_filtered (TYPE_NAME (exp->elts[pc + 1].type), stream);
  93       fputs_filtered ("::", stream);
  94       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  95       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  96       fputs_filtered (&exp->elts[pc + 3].string, stream);
  97       return;
  98
  99     case OP_LONG:
 100       {
 101         struct value_print_options opts;
 102
 103         get_no_prettyformat_print_options (&opts);
 104         (*pos) += 3;
 105         value_print (value_from_longest (exp->elts[pc + 1].type,
 106                                          exp->elts[pc + 2].longconst),
 107                      stream, &opts);
 108       }
 109       return;
 110
 111     case OP_FLOAT:
 112       {
 113         struct value_print_options opts;
 114
 115         get_no_prettyformat_print_options (&opts);
 116         (*pos) += 3;
 117         value_print (value_from_contents (exp->elts[pc + 1].type,
 118                                           exp->elts[pc + 2].floatconst),
 119                      stream, &opts);
 120       }
 121       return;
 122
 123     case OP_VAR_VALUE:
 124       {
 125         const struct block *b;
 126
 127         (*pos) += 3;
 128         b = exp->elts[pc + 1].block;
 129         if (b != NULL
 130             && BLOCK_FUNCTION (b) != NULL
 131             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 132           {
 133             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 134             fputs_filtered ("::", stream);
 135           }
 136         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 137       }
 138       return;
 139
 140     case OP_VAR_MSYM_VALUE:
 141       {
 142         (*pos) += 3;
 143         fputs_filtered (MSYMBOL_PRINT_NAME (exp->elts[pc + 2].msymbol), stream);
 144       }
 145       return;
 146
 147     case OP_FUNC_STATIC_VAR:
 148       {
 149         tem = longest_to_int (exp->elts[pc + 1].longconst);
 150         (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 151         fputs_filtered (&exp->elts[pc + 1].string, stream);
 152       }
 153       return;
 154
 155     case OP_VAR_ENTRY_VALUE:
 156       {
 157         (*pos) += 2;
 158         fprintf_filtered (stream, "%s@entry",
 159                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 160       }
 161       return;
 162
 163     case OP_LAST:
 164       (*pos) += 2;
 165       fprintf_filtered (stream, "$%d",
 166                         longest_to_int (exp->elts[pc + 1].longconst));
 167       return;
 168
 169     case OP_REGISTER:
 170       {
 171         const char *name = &exp->elts[pc + 2].string;
 172
 173         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 174         fprintf_filtered (stream, "$%s", name);
 175         return;
 176       }
 177
 178     case OP_BOOL:
 179       (*pos) += 2;
 180       fprintf_filtered (stream, "%s",
 181                         longest_to_int (exp->elts[pc + 1].longconst)
 182                         ? "TRUE" : "FALSE");
 183       return;
 184
 185     case OP_INTERNALVAR:
 186       (*pos) += 2;
 187       fprintf_filtered (stream, "$%s",
 188                         internalvar_name (exp->elts[pc + 1].internalvar));
 189       return;
 190
 191     case OP_FUNCALL:
 192     case OP_F77_UNDETERMINED_ARGLIST:
 193       (*pos) += 2;
 194       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 195       print_subexp (exp, pos, stream, PREC_SUFFIX);
 196       fputs_filtered (" (", stream);
 197       for (tem = 0; tem < nargs; tem++)
 198         {
 199           if (tem != 0)
 200             fputs_filtered (", ", stream);
 201           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 202         }
 203       fputs_filtered (")", stream);
 204       return;
 205
 206     case OP_NAME:
 207       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 208       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 209       fputs_filtered (&exp->elts[pc + 2].string, stream);
 210       return;
 211
 212     case OP_STRING:
 213       {
 214         struct value_print_options opts;
 215
 216         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 217         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 218         /* LA_PRINT_STRING will print using the current repeat count threshold.
 219            If necessary, we can temporarily set it to zero, or pass it as an
 220            additional parameter to LA_PRINT_STRING.  -fnf */
 221         get_user_print_options (&opts);
 222         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 223                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 224                          NULL, 0, &opts);
 225       }
 226       return;
 227
 228     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 229                                    NSString constant.  */
 230       {
 231         struct value_print_options opts;
 232
 233         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 234         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 235         fputs_filtered ("@\"", stream);
 236         get_user_print_options (&opts);
 237         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 238                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 239                          NULL, 0, &opts);
 240         fputs_filtered ("\"", stream);
 241       }
 242       return;
 243
 244     case OP_OBJC_MSGCALL:
 245       {                 /* Objective C message (method) call.  */
 246         gdb::unique_xmalloc_ptr<char> selector;
 247
 248         (*pos) += 3;
 249         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 250         fprintf_unfiltered (stream, "[");
 251         print_subexp (exp, pos, stream, PREC_SUFFIX);
 252         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 253                                      &selector, 1024, NULL))
 254           {
 255             error (_("bad selector"));
 256             return;
 257           }
 258         if (nargs)
 259           {
 260             char *s, *nextS;
 261
 262             s = selector.get ();
 263             for (tem = 0; tem < nargs; tem++)
 264               {
 265                 nextS = strchr (s, ':');
 266                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 267                 *nextS = '\0';
 268                 fprintf_unfiltered (stream, " %s: ", s);
 269                 s = nextS + 1;
 270                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 271               }
 272           }
 273         else
 274           {
 275             fprintf_unfiltered (stream, " %s", selector.get ());
 276           }
 277         fprintf_unfiltered (stream, "]");
 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         if (range_type == NONE_BOUND_DEFAULT_EXCLUSIVE
 585             || range_type == LOW_BOUND_DEFAULT_EXCLUSIVE)
 586           fputs_filtered ("EXCLUSIVE_", stream);
 587         fputs_filtered ("RANGE(", stream);
 588         if (range_type == HIGH_BOUND_DEFAULT
 589             || range_type == NONE_BOUND_DEFAULT
 590             || range_type == NONE_BOUND_DEFAULT_EXCLUSIVE)
 591           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 592         fputs_filtered ("..", stream);
 593         if (range_type == LOW_BOUND_DEFAULT
 594             || range_type == NONE_BOUND_DEFAULT)
 595           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 596         fputs_filtered (")", stream);
 597         return;
 598       }
 599
 600       /* Default ops */
 601
 602     default:
 603       op_str = "???";
 604       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 605         if (op_print_tab[tem].opcode == opcode)
 606           {
 607             op_str = op_print_tab[tem].string;
 608             myprec = op_print_tab[tem].precedence;
 609             assoc = op_print_tab[tem].right_assoc;
 610             break;
 611           }
 612       if (op_print_tab[tem].opcode != opcode)
 613         /* Not found; don't try to keep going because we don't know how
 614            to interpret further elements.  For example, this happens
 615            if opcode is OP_TYPE.  */
 616         error (_("Invalid expression"));
 617     }
 618
 619   /* Note that PREC_BUILTIN will always emit parentheses.  */
 620   if ((int) myprec < (int) prec)
 621     fputs_filtered ("(", stream);
 622   if ((int) opcode > (int) BINOP_END)
 623     {
 624       if (assoc)
 625         {
 626           /* Unary postfix operator.  */
 627           print_subexp (exp, pos, stream, PREC_SUFFIX);
 628           fputs_filtered (op_str, stream);
 629         }
 630       else
 631         {
 632           /* Unary prefix operator.  */
 633           fputs_filtered (op_str, stream);
 634           if (myprec == PREC_BUILTIN_FUNCTION)
 635             fputs_filtered ("(", stream);
 636           print_subexp (exp, pos, stream, PREC_PREFIX);
 637           if (myprec == PREC_BUILTIN_FUNCTION)
 638             fputs_filtered (")", stream);
 639         }
 640     }
 641   else
 642     {
 643       /* Binary operator.  */
 644       /* Print left operand.
 645          If operator is right-associative,
 646          increment precedence for this operand.  */
 647       print_subexp (exp, pos, stream,
 648                     (enum precedence) ((int) myprec + assoc));
 649       /* Print the operator itself.  */
 650       if (assign_modify)
 651         fprintf_filtered (stream, " %s= ", op_str);
 652       else if (op_str[0] == ',')
 653         fprintf_filtered (stream, "%s ", op_str);
 654       else
 655         fprintf_filtered (stream, " %s ", op_str);
 656       /* Print right operand.
 657          If operator is left-associative,
 658          increment precedence for this operand.  */
 659       print_subexp (exp, pos, stream,
 660                     (enum precedence) ((int) myprec + !assoc));
 661     }
 662
 663   if ((int) myprec < (int) prec)
 664     fputs_filtered (")", stream);
 665 }
 666
 667 /* Return the operator corresponding to opcode OP as
 668    a string.   NULL indicates that the opcode was not found in the
 669    current language table.  */
 670 const char *
 671 op_string (enum exp_opcode op)
 672 {
 673   int tem;
 674   const struct op_print *op_print_tab;
 675
 676   op_print_tab = current_language->la_op_print_tab;
 677   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 678     if (op_print_tab[tem].opcode == op)
 679       return op_print_tab[tem].string;
 680   return NULL;
 681 }
 682
 683 /* Support for dumping the raw data from expressions in a human readable
 684    form.  */
 685
 686 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 687
 688 /* Name for OPCODE, when it appears in expression EXP.  */
 689
 690 const char *
 691 op_name (struct expression *exp, enum exp_opcode opcode)
 692 {
 693   if (opcode >= OP_UNUSED_LAST)
 694     {
 695       char *cell = get_print_cell ();
 696       xsnprintf (cell, PRINT_CELL_SIZE, "unknown opcode: %u",
 697                  unsigned (opcode));
 698       return cell;
 699     }
 700   return exp->language_defn->la_exp_desc->op_name (opcode);
 701 }
 702
 703 /* Default name for the standard operator OPCODE (i.e., one defined in
 704    the definition of enum exp_opcode).  */
 705
 706 const char *
 707 op_name_standard (enum exp_opcode opcode)
 708 {
 709   switch (opcode)
 710     {
 711     default:
 712       {
 713         static char buf[30];
 714
 715         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 716         return buf;
 717       }
 718 #define OP(name)        \
 719     case name:          \
 720       return #name ;
 721 #include "std-operator.def"
 722 #undef OP
 723     }
 724 }
 725
 726 /* Print a raw dump of expression EXP to STREAM.
 727    NOTE, if non-NULL, is printed as extra explanatory text.  */
 728
 729 void
 730 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 731                      const char *note)
 732 {
 733   int elt;
 734   char *eltscan;
 735   int eltsize;
 736
 737   fprintf_filtered (stream, "Dump of expression @ ");
 738   gdb_print_host_address (exp, stream);
 739   if (note)
 740     fprintf_filtered (stream, ", %s:", note);
 741   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 742                     exp->language_defn->la_name, exp->nelts,
 743                     (long) sizeof (union exp_element));
 744   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 745                     "Hex Value", "String Value");
 746   for (elt = 0; elt < exp->nelts; elt++)
 747     {
 748       fprintf_filtered (stream, "\t%5d  ", elt);
 749
 750       const char *opcode_name = op_name (exp, exp->elts[elt].opcode);
 751       fprintf_filtered (stream, "%20s  ", opcode_name);
 752
 753       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 754       fprintf_filtered (stream, "  ");
 755
 756       for (eltscan = (char *) &exp->elts[elt],
 757            eltsize = sizeof (union exp_element);
 758            eltsize-- > 0;
 759            eltscan++)
 760         {
 761           fprintf_filtered (stream, "%c",
 762                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 763         }
 764       fprintf_filtered (stream, "\n");
 765     }
 766 }
 767
 768 /* Dump the subexpression of prefix expression EXP whose operator is at
 769    position ELT onto STREAM.  Returns the position of the next
 770    subexpression in EXP.  */
 771
 772 int
 773 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 774 {
 775   static int indent = 0;
 776   int i;
 777
 778   fprintf_filtered (stream, "\n");
 779   fprintf_filtered (stream, "\t%5d  ", elt);
 780
 781   for (i = 1; i <= indent; i++)
 782     fprintf_filtered (stream, " ");
 783   indent += 2;
 784
 785   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 786
 787   elt = dump_subexp_body (exp, stream, elt);
 788
 789   indent -= 2;
 790
 791   return elt;
 792 }
 793
 794 /* Dump the operands of prefix expression EXP whose opcode is at
 795    position ELT onto STREAM.  Returns the position of the next
 796    subexpression in EXP.  */
 797
 798 static int
 799 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 800 {
 801   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 802 }
 803
 804 /* Default value for subexp_body in exp_descriptor vector.  */
 805
 806 int
 807 dump_subexp_body_standard (struct expression *exp,
 808                            struct ui_file *stream, int elt)
 809 {
 810   int opcode = exp->elts[elt++].opcode;
 811
 812   switch (opcode)
 813     {
 814     case TERNOP_COND:
 815     case TERNOP_SLICE:
 816       elt = dump_subexp (exp, stream, elt);
 817       /* FALL THROUGH */
 818     case BINOP_ADD:
 819     case BINOP_SUB:
 820     case BINOP_MUL:
 821     case BINOP_DIV:
 822     case BINOP_REM:
 823     case BINOP_MOD:
 824     case BINOP_LSH:
 825     case BINOP_RSH:
 826     case BINOP_LOGICAL_AND:
 827     case BINOP_LOGICAL_OR:
 828     case BINOP_BITWISE_AND:
 829     case BINOP_BITWISE_IOR:
 830     case BINOP_BITWISE_XOR:
 831     case BINOP_EQUAL:
 832     case BINOP_NOTEQUAL:
 833     case BINOP_LESS:
 834     case BINOP_GTR:
 835     case BINOP_LEQ:
 836     case BINOP_GEQ:
 837     case BINOP_REPEAT:
 838     case BINOP_ASSIGN:
 839     case BINOP_COMMA:
 840     case BINOP_SUBSCRIPT:
 841     case BINOP_EXP:
 842     case BINOP_MIN:
 843     case BINOP_MAX:
 844     case BINOP_INTDIV:
 845     case BINOP_ASSIGN_MODIFY:
 846     case BINOP_VAL:
 847     case BINOP_CONCAT:
 848     case BINOP_END:
 849     case STRUCTOP_MEMBER:
 850     case STRUCTOP_MPTR:
 851       elt = dump_subexp (exp, stream, elt);
 852       /* FALL THROUGH */
 853     case UNOP_NEG:
 854     case UNOP_LOGICAL_NOT:
 855     case UNOP_COMPLEMENT:
 856     case UNOP_IND:
 857     case UNOP_ADDR:
 858     case UNOP_PREINCREMENT:
 859     case UNOP_POSTINCREMENT:
 860     case UNOP_PREDECREMENT:
 861     case UNOP_POSTDECREMENT:
 862     case UNOP_SIZEOF:
 863     case UNOP_ALIGNOF:
 864     case UNOP_PLUS:
 865     case UNOP_CAP:
 866     case UNOP_CHR:
 867     case UNOP_ORD:
 868     case UNOP_ABS:
 869     case UNOP_FLOAT:
 870     case UNOP_HIGH:
 871     case UNOP_MAX:
 872     case UNOP_MIN:
 873     case UNOP_ODD:
 874     case UNOP_TRUNC:
 875     case UNOP_KIND:
 876       elt = dump_subexp (exp, stream, elt);
 877       break;
 878     case OP_LONG:
 879       fprintf_filtered (stream, "Type @");
 880       gdb_print_host_address (exp->elts[elt].type, stream);
 881       fprintf_filtered (stream, " (");
 882       type_print (exp->elts[elt].type, NULL, stream, 0);
 883       fprintf_filtered (stream, "), value %ld (0x%lx)",
 884                         (long) exp->elts[elt + 1].longconst,
 885                         (long) exp->elts[elt + 1].longconst);
 886       elt += 3;
 887       break;
 888     case OP_FLOAT:
 889       fprintf_filtered (stream, "Type @");
 890       gdb_print_host_address (exp->elts[elt].type, stream);
 891       fprintf_filtered (stream, " (");
 892       type_print (exp->elts[elt].type, NULL, stream, 0);
 893       fprintf_filtered (stream, "), value ");
 894       print_floating (exp->elts[elt + 1].floatconst,
 895                       exp->elts[elt].type, stream);
 896       elt += 3;
 897       break;
 898     case OP_VAR_VALUE:
 899       fprintf_filtered (stream, "Block @");
 900       gdb_print_host_address (exp->elts[elt].block, stream);
 901       fprintf_filtered (stream, ", symbol @");
 902       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 903       fprintf_filtered (stream, " (%s)",
 904                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 905       elt += 3;
 906       break;
 907     case OP_VAR_MSYM_VALUE:
 908       fprintf_filtered (stream, "Objfile @");
 909       gdb_print_host_address (exp->elts[elt].objfile, stream);
 910       fprintf_filtered (stream, ", msymbol @");
 911       gdb_print_host_address (exp->elts[elt + 1].msymbol, stream);
 912       fprintf_filtered (stream, " (%s)",
 913                         MSYMBOL_PRINT_NAME (exp->elts[elt + 1].msymbol));
 914       elt += 3;
 915       break;
 916     case OP_VAR_ENTRY_VALUE:
 917       fprintf_filtered (stream, "Entry value of symbol @");
 918       gdb_print_host_address (exp->elts[elt].symbol, stream);
 919       fprintf_filtered (stream, " (%s)",
 920                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 921       elt += 2;
 922       break;
 923     case OP_LAST:
 924       fprintf_filtered (stream, "History element %ld",
 925                         (long) exp->elts[elt].longconst);
 926       elt += 2;
 927       break;
 928     case OP_REGISTER:
 929       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 930       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 931       break;
 932     case OP_INTERNALVAR:
 933       fprintf_filtered (stream, "Internal var @");
 934       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 935       fprintf_filtered (stream, " (%s)",
 936                         internalvar_name (exp->elts[elt].internalvar));
 937       elt += 2;
 938       break;
 939     case OP_FUNCALL:
 940     case OP_F77_UNDETERMINED_ARGLIST:
 941       {
 942         int i, nargs;
 943
 944         nargs = longest_to_int (exp->elts[elt].longconst);
 945
 946         fprintf_filtered (stream, "Number of args: %d", nargs);
 947         elt += 2;
 948
 949         for (i = 1; i <= nargs + 1; i++)
 950           elt = dump_subexp (exp, stream, elt);
 951       }
 952       break;
 953     case OP_ARRAY:
 954       {
 955         int lower, upper;
 956         int i;
 957
 958         lower = longest_to_int (exp->elts[elt].longconst);
 959         upper = longest_to_int (exp->elts[elt + 1].longconst);
 960
 961         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 962         elt += 3;
 963
 964         for (i = 1; i <= upper - lower + 1; i++)
 965           elt = dump_subexp (exp, stream, elt);
 966       }
 967       break;
 968     case UNOP_DYNAMIC_CAST:
 969     case UNOP_REINTERPRET_CAST:
 970     case UNOP_CAST_TYPE:
 971     case UNOP_MEMVAL_TYPE:
 972       fprintf_filtered (stream, " (");
 973       elt = dump_subexp (exp, stream, elt);
 974       fprintf_filtered (stream, ")");
 975       elt = dump_subexp (exp, stream, elt);
 976       break;
 977     case UNOP_MEMVAL:
 978     case UNOP_CAST:
 979       fprintf_filtered (stream, "Type @");
 980       gdb_print_host_address (exp->elts[elt].type, stream);
 981       fprintf_filtered (stream, " (");
 982       type_print (exp->elts[elt].type, NULL, stream, 0);
 983       fprintf_filtered (stream, ")");
 984       elt = dump_subexp (exp, stream, elt + 2);
 985       break;
 986     case OP_TYPE:
 987       fprintf_filtered (stream, "Type @");
 988       gdb_print_host_address (exp->elts[elt].type, stream);
 989       fprintf_filtered (stream, " (");
 990       type_print (exp->elts[elt].type, NULL, stream, 0);
 991       fprintf_filtered (stream, ")");
 992       elt += 2;
 993       break;
 994     case OP_TYPEOF:
 995     case OP_DECLTYPE:
 996       fprintf_filtered (stream, "Typeof (");
 997       elt = dump_subexp (exp, stream, elt);
 998       fprintf_filtered (stream, ")");
 999       break;
1000     case OP_TYPEID:
1001       fprintf_filtered (stream, "typeid (");
1002       elt = dump_subexp (exp, stream, elt);
1003       fprintf_filtered (stream, ")");
1004       break;
1005     case STRUCTOP_STRUCT:
1006     case STRUCTOP_PTR:
1007       {
1008         char *elem_name;
1009         int len;
1010
1011         len = longest_to_int (exp->elts[elt].longconst);
1012         elem_name = &exp->elts[elt + 1].string;
1013
1014         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1015         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1016       }
1017       break;
1018     case OP_SCOPE:
1019       {
1020         char *elem_name;
1021         int len;
1022
1023         fprintf_filtered (stream, "Type @");
1024         gdb_print_host_address (exp->elts[elt].type, stream);
1025         fprintf_filtered (stream, " (");
1026         type_print (exp->elts[elt].type, NULL, stream, 0);
1027         fprintf_filtered (stream, ") ");
1028
1029         len = longest_to_int (exp->elts[elt + 1].longconst);
1030         elem_name = &exp->elts[elt + 2].string;
1031
1032         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1033         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1034       }
1035       break;
1036
1037     case OP_FUNC_STATIC_VAR:
1038       {
1039         int len = longest_to_int (exp->elts[elt].longconst);
1040         const char *var_name = &exp->elts[elt + 1].string;
1041         fprintf_filtered (stream, "Field name: `%.*s'", len, var_name);
1042         elt += 3 + BYTES_TO_EXP_ELEM (len + 1);
1043       }
1044       break;
1045
1046     case TYPE_INSTANCE:
1047       {
1048         type_instance_flags flags
1049           = (type_instance_flag_value) longest_to_int (exp->elts[elt++].longconst);
1050         LONGEST len = exp->elts[elt++].longconst;
1051         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
1052         while (len-- > 0)
1053           {
1054             fprintf_filtered (stream, "Type @");
1055             gdb_print_host_address (exp->elts[elt].type, stream);
1056             fprintf_filtered (stream, " (");
1057             type_print (exp->elts[elt].type, NULL, stream, 0);
1058             fprintf_filtered (stream, ")");
1059             elt++;
1060             if (len > 0)
1061               fputs_filtered (", ", stream);
1062           }
1063
1064         fprintf_filtered (stream, " Flags: %s (", hex_string (flags));
1065         bool space = false;
1066         auto print_one = [&] (const char *mod)
1067           {
1068             if (space)
1069               fputs_filtered (" ", stream);
1070             space = true;
1071             fprintf_filtered (stream, "%s", mod);
1072           };
1073         if (flags & TYPE_INSTANCE_FLAG_CONST)
1074           print_one ("const");
1075         if (flags & TYPE_INSTANCE_FLAG_VOLATILE)
1076           print_one ("volatile");
1077         fprintf_filtered (stream, ")");
1078
1079         /* Ending LEN and ending TYPE_INSTANCE.  */
1080         elt += 2;
1081         elt = dump_subexp (exp, stream, elt);
1082       }
1083       break;
1084     case OP_STRING:
1085       {
1086         LONGEST len = exp->elts[elt].longconst;
1087         LONGEST type = exp->elts[elt + 1].longconst;
1088
1089         fprintf_filtered (stream, "Language-specific string type: %s",
1090                           plongest (type));
1091
1092         /* Skip length.  */
1093         elt += 1;
1094
1095         /* Skip string content. */
1096         elt += BYTES_TO_EXP_ELEM (len);
1097
1098         /* Skip length and ending OP_STRING. */
1099         elt += 2;
1100       }
1101       break;
1102     case OP_RANGE:
1103       {
1104         enum range_type range_type;
1105
1106         range_type = (enum range_type)
1107           longest_to_int (exp->elts[elt].longconst);
1108         elt += 2;
1109
1110         switch (range_type)
1111           {
1112           case BOTH_BOUND_DEFAULT:
1113             fputs_filtered ("Range '..'", stream);
1114             break;
1115           case LOW_BOUND_DEFAULT:
1116             fputs_filtered ("Range '..EXP'", stream);
1117             break;
1118           case LOW_BOUND_DEFAULT_EXCLUSIVE:
1119             fputs_filtered ("ExclusiveRange '..EXP'", stream);
1120             break;
1121           case HIGH_BOUND_DEFAULT:
1122             fputs_filtered ("Range 'EXP..'", stream);
1123             break;
1124           case NONE_BOUND_DEFAULT:
1125             fputs_filtered ("Range 'EXP..EXP'", stream);
1126             break;
1127           case NONE_BOUND_DEFAULT_EXCLUSIVE:
1128             fputs_filtered ("ExclusiveRange 'EXP..EXP'", stream);
1129             break;
1130           default:
1131             fputs_filtered ("Invalid Range!", stream);
1132             break;
1133           }
1134
1135         if (range_type == HIGH_BOUND_DEFAULT
1136             || range_type == NONE_BOUND_DEFAULT)
1137           elt = dump_subexp (exp, stream, elt);
1138         if (range_type == LOW_BOUND_DEFAULT
1139             || range_type == NONE_BOUND_DEFAULT)
1140           elt = dump_subexp (exp, stream, elt);
1141       }
1142       break;
1143
1144     default:
1145     case OP_NULL:
1146     case MULTI_SUBSCRIPT:
1147     case OP_COMPLEX:
1148     case OP_BOOL:
1149     case OP_M2_STRING:
1150     case OP_THIS:
1151     case OP_NAME:
1152       fprintf_filtered (stream, "Unknown format");
1153     }
1154
1155   return elt;
1156 }
1157
1158 void
1159 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1160 {
1161   int elt;
1162
1163   fprintf_filtered (stream, "Dump of expression @ ");
1164   gdb_print_host_address (exp, stream);
1165   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1166   print_expression (exp, stream);
1167   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1168                     exp->language_defn->la_name, exp->nelts,
1169                     (long) sizeof (union exp_element));
1170   fputs_filtered ("\n", stream);
1171
1172   for (elt = 0; elt < exp->nelts;)
1173     elt = dump_subexp (exp, stream, elt);
1174   fputs_filtered ("\n", stream);
1175 }