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