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 #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 (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         if (range_type == NONE_BOUND_DEFAULT_EXCLUSIVE
 582             || range_type == LOW_BOUND_DEFAULT_EXCLUSIVE)
 583           fputs_filtered ("EXCLUSIVE_", stream);
 584         fputs_filtered ("RANGE(", stream);
 585         if (range_type == HIGH_BOUND_DEFAULT
 586             || range_type == NONE_BOUND_DEFAULT
 587             || range_type == NONE_BOUND_DEFAULT_EXCLUSIVE)
 588           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 589         fputs_filtered ("..", stream);
 590         if (range_type == LOW_BOUND_DEFAULT
 591             || range_type == NONE_BOUND_DEFAULT)
 592           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 593         fputs_filtered (")", stream);
 594         return;
 595       }
 596
 597       /* Default ops */
 598
 599     default:
 600       op_str = "???";
 601       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 602         if (op_print_tab[tem].opcode == opcode)
 603           {
 604             op_str = op_print_tab[tem].string;
 605             myprec = op_print_tab[tem].precedence;
 606             assoc = op_print_tab[tem].right_assoc;
 607             break;
 608           }
 609       if (op_print_tab[tem].opcode != opcode)
 610         /* Not found; don't try to keep going because we don't know how
 611            to interpret further elements.  For example, this happens
 612            if opcode is OP_TYPE.  */
 613         error (_("Invalid expression"));
 614     }
 615
 616   /* Note that PREC_BUILTIN will always emit parentheses.  */
 617   if ((int) myprec < (int) prec)
 618     fputs_filtered ("(", stream);
 619   if ((int) opcode > (int) BINOP_END)
 620     {
 621       if (assoc)
 622         {
 623           /* Unary postfix operator.  */
 624           print_subexp (exp, pos, stream, PREC_SUFFIX);
 625           fputs_filtered (op_str, stream);
 626         }
 627       else
 628         {
 629           /* Unary prefix operator.  */
 630           fputs_filtered (op_str, stream);
 631           if (myprec == PREC_BUILTIN_FUNCTION)
 632             fputs_filtered ("(", stream);
 633           print_subexp (exp, pos, stream, PREC_PREFIX);
 634           if (myprec == PREC_BUILTIN_FUNCTION)
 635             fputs_filtered (")", stream);
 636         }
 637     }
 638   else
 639     {
 640       /* Binary operator.  */
 641       /* Print left operand.
 642          If operator is right-associative,
 643          increment precedence for this operand.  */
 644       print_subexp (exp, pos, stream,
 645                     (enum precedence) ((int) myprec + assoc));
 646       /* Print the operator itself.  */
 647       if (assign_modify)
 648         fprintf_filtered (stream, " %s= ", op_str);
 649       else if (op_str[0] == ',')
 650         fprintf_filtered (stream, "%s ", op_str);
 651       else
 652         fprintf_filtered (stream, " %s ", op_str);
 653       /* Print right operand.
 654          If operator is left-associative,
 655          increment precedence for this operand.  */
 656       print_subexp (exp, pos, stream,
 657                     (enum precedence) ((int) myprec + !assoc));
 658     }
 659
 660   if ((int) myprec < (int) prec)
 661     fputs_filtered (")", stream);
 662 }
 663
 664 /* Return the operator corresponding to opcode OP as
 665    a string.   NULL indicates that the opcode was not found in the
 666    current language table.  */
 667 const char *
 668 op_string (enum exp_opcode op)
 669 {
 670   int tem;
 671   const struct op_print *op_print_tab;
 672
 673   op_print_tab = current_language->la_op_print_tab;
 674   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 675     if (op_print_tab[tem].opcode == op)
 676       return op_print_tab[tem].string;
 677   return NULL;
 678 }
 679
 680 /* Support for dumping the raw data from expressions in a human readable
 681    form.  */
 682
 683 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 684
 685 /* Name for OPCODE, when it appears in expression EXP.  */
 686
 687 const char *
 688 op_name (struct expression *exp, enum exp_opcode opcode)
 689 {
 690   if (opcode >= OP_UNUSED_LAST)
 691     {
 692       char *cell = get_print_cell ();
 693       xsnprintf (cell, PRINT_CELL_SIZE, "unknown opcode: %u",
 694                  unsigned (opcode));
 695       return cell;
 696     }
 697   return exp->language_defn->la_exp_desc->op_name (opcode);
 698 }
 699
 700 /* Default name for the standard operator OPCODE (i.e., one defined in
 701    the definition of enum exp_opcode).  */
 702
 703 const char *
 704 op_name_standard (enum exp_opcode opcode)
 705 {
 706   switch (opcode)
 707     {
 708     default:
 709       {
 710         static char buf[30];
 711
 712         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 713         return buf;
 714       }
 715 #define OP(name)        \
 716     case name:          \
 717       return #name ;
 718 #include "std-operator.def"
 719 #undef OP
 720     }
 721 }
 722
 723 /* Print a raw dump of expression EXP to STREAM.
 724    NOTE, if non-NULL, is printed as extra explanatory text.  */
 725
 726 void
 727 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 728                      const char *note)
 729 {
 730   int elt;
 731   char *eltscan;
 732   int eltsize;
 733
 734   fprintf_filtered (stream, "Dump of expression @ ");
 735   gdb_print_host_address (exp, stream);
 736   if (note)
 737     fprintf_filtered (stream, ", %s:", note);
 738   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 739                     exp->language_defn->la_name, exp->nelts,
 740                     (long) sizeof (union exp_element));
 741   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 742                     "Hex Value", "String Value");
 743   for (elt = 0; elt < exp->nelts; elt++)
 744     {
 745       fprintf_filtered (stream, "\t%5d  ", elt);
 746
 747       const char *opcode_name = op_name (exp, exp->elts[elt].opcode);
 748       fprintf_filtered (stream, "%20s  ", opcode_name);
 749
 750       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 751       fprintf_filtered (stream, "  ");
 752
 753       for (eltscan = (char *) &exp->elts[elt],
 754            eltsize = sizeof (union exp_element);
 755            eltsize-- > 0;
 756            eltscan++)
 757         {
 758           fprintf_filtered (stream, "%c",
 759                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 760         }
 761       fprintf_filtered (stream, "\n");
 762     }
 763 }
 764
 765 /* Dump the subexpression of prefix expression EXP whose operator is at
 766    position ELT onto STREAM.  Returns the position of the next
 767    subexpression in EXP.  */
 768
 769 int
 770 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 771 {
 772   static int indent = 0;
 773   int i;
 774
 775   fprintf_filtered (stream, "\n");
 776   fprintf_filtered (stream, "\t%5d  ", elt);
 777
 778   for (i = 1; i <= indent; i++)
 779     fprintf_filtered (stream, " ");
 780   indent += 2;
 781
 782   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 783
 784   elt = dump_subexp_body (exp, stream, elt);
 785
 786   indent -= 2;
 787
 788   return elt;
 789 }
 790
 791 /* Dump the operands of prefix expression EXP whose opcode is at
 792    position ELT onto STREAM.  Returns the position of the next
 793    subexpression in EXP.  */
 794
 795 static int
 796 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 797 {
 798   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 799 }
 800
 801 /* Default value for subexp_body in exp_descriptor vector.  */
 802
 803 int
 804 dump_subexp_body_standard (struct expression *exp,
 805                            struct ui_file *stream, int elt)
 806 {
 807   int opcode = exp->elts[elt++].opcode;
 808
 809   switch (opcode)
 810     {
 811     case TERNOP_COND:
 812     case TERNOP_SLICE:
 813       elt = dump_subexp (exp, stream, elt);
 814       /* FALL THROUGH */
 815     case BINOP_ADD:
 816     case BINOP_SUB:
 817     case BINOP_MUL:
 818     case BINOP_DIV:
 819     case BINOP_REM:
 820     case BINOP_MOD:
 821     case BINOP_LSH:
 822     case BINOP_RSH:
 823     case BINOP_LOGICAL_AND:
 824     case BINOP_LOGICAL_OR:
 825     case BINOP_BITWISE_AND:
 826     case BINOP_BITWISE_IOR:
 827     case BINOP_BITWISE_XOR:
 828     case BINOP_EQUAL:
 829     case BINOP_NOTEQUAL:
 830     case BINOP_LESS:
 831     case BINOP_GTR:
 832     case BINOP_LEQ:
 833     case BINOP_GEQ:
 834     case BINOP_REPEAT:
 835     case BINOP_ASSIGN:
 836     case BINOP_COMMA:
 837     case BINOP_SUBSCRIPT:
 838     case BINOP_EXP:
 839     case BINOP_MIN:
 840     case BINOP_MAX:
 841     case BINOP_INTDIV:
 842     case BINOP_ASSIGN_MODIFY:
 843     case BINOP_VAL:
 844     case BINOP_CONCAT:
 845     case BINOP_END:
 846     case STRUCTOP_MEMBER:
 847     case STRUCTOP_MPTR:
 848       elt = dump_subexp (exp, stream, elt);
 849       /* FALL THROUGH */
 850     case UNOP_NEG:
 851     case UNOP_LOGICAL_NOT:
 852     case UNOP_COMPLEMENT:
 853     case UNOP_IND:
 854     case UNOP_ADDR:
 855     case UNOP_PREINCREMENT:
 856     case UNOP_POSTINCREMENT:
 857     case UNOP_PREDECREMENT:
 858     case UNOP_POSTDECREMENT:
 859     case UNOP_SIZEOF:
 860     case UNOP_ALIGNOF:
 861     case UNOP_PLUS:
 862     case UNOP_CAP:
 863     case UNOP_CHR:
 864     case UNOP_ORD:
 865     case UNOP_ABS:
 866     case UNOP_FLOAT:
 867     case UNOP_HIGH:
 868     case UNOP_MAX:
 869     case UNOP_MIN:
 870     case UNOP_ODD:
 871     case UNOP_TRUNC:
 872       elt = dump_subexp (exp, stream, elt);
 873       break;
 874     case OP_LONG:
 875       fprintf_filtered (stream, "Type @");
 876       gdb_print_host_address (exp->elts[elt].type, stream);
 877       fprintf_filtered (stream, " (");
 878       type_print (exp->elts[elt].type, NULL, stream, 0);
 879       fprintf_filtered (stream, "), value %ld (0x%lx)",
 880                         (long) exp->elts[elt + 1].longconst,
 881                         (long) exp->elts[elt + 1].longconst);
 882       elt += 3;
 883       break;
 884     case OP_FLOAT:
 885       fprintf_filtered (stream, "Type @");
 886       gdb_print_host_address (exp->elts[elt].type, stream);
 887       fprintf_filtered (stream, " (");
 888       type_print (exp->elts[elt].type, NULL, stream, 0);
 889       fprintf_filtered (stream, "), value ");
 890       print_floating (exp->elts[elt + 1].floatconst,
 891                       exp->elts[elt].type, stream);
 892       elt += 3;
 893       break;
 894     case OP_VAR_VALUE:
 895       fprintf_filtered (stream, "Block @");
 896       gdb_print_host_address (exp->elts[elt].block, stream);
 897       fprintf_filtered (stream, ", symbol @");
 898       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 899       fprintf_filtered (stream, " (%s)",
 900                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 901       elt += 3;
 902       break;
 903     case OP_VAR_MSYM_VALUE:
 904       fprintf_filtered (stream, "Objfile @");
 905       gdb_print_host_address (exp->elts[elt].objfile, stream);
 906       fprintf_filtered (stream, ", msymbol @");
 907       gdb_print_host_address (exp->elts[elt + 1].msymbol, stream);
 908       fprintf_filtered (stream, " (%s)",
 909                         MSYMBOL_PRINT_NAME (exp->elts[elt + 1].msymbol));
 910       elt += 3;
 911       break;
 912     case OP_VAR_ENTRY_VALUE:
 913       fprintf_filtered (stream, "Entry value of symbol @");
 914       gdb_print_host_address (exp->elts[elt].symbol, stream);
 915       fprintf_filtered (stream, " (%s)",
 916                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 917       elt += 2;
 918       break;
 919     case OP_LAST:
 920       fprintf_filtered (stream, "History element %ld",
 921                         (long) exp->elts[elt].longconst);
 922       elt += 2;
 923       break;
 924     case OP_REGISTER:
 925       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 926       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 927       break;
 928     case OP_INTERNALVAR:
 929       fprintf_filtered (stream, "Internal var @");
 930       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 931       fprintf_filtered (stream, " (%s)",
 932                         internalvar_name (exp->elts[elt].internalvar));
 933       elt += 2;
 934       break;
 935     case OP_FUNCALL:
 936     case OP_F77_UNDETERMINED_ARGLIST:
 937       {
 938         int i, nargs;
 939
 940         nargs = longest_to_int (exp->elts[elt].longconst);
 941
 942         fprintf_filtered (stream, "Number of args: %d", nargs);
 943         elt += 2;
 944
 945         for (i = 1; i <= nargs + 1; i++)
 946           elt = dump_subexp (exp, stream, elt);
 947       }
 948       break;
 949     case OP_ARRAY:
 950       {
 951         int lower, upper;
 952         int i;
 953
 954         lower = longest_to_int (exp->elts[elt].longconst);
 955         upper = longest_to_int (exp->elts[elt + 1].longconst);
 956
 957         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 958         elt += 3;
 959
 960         for (i = 1; i <= upper - lower + 1; i++)
 961           elt = dump_subexp (exp, stream, elt);
 962       }
 963       break;
 964     case UNOP_DYNAMIC_CAST:
 965     case UNOP_REINTERPRET_CAST:
 966     case UNOP_CAST_TYPE:
 967     case UNOP_MEMVAL_TYPE:
 968       fprintf_filtered (stream, " (");
 969       elt = dump_subexp (exp, stream, elt);
 970       fprintf_filtered (stream, ")");
 971       elt = dump_subexp (exp, stream, elt);
 972       break;
 973     case UNOP_MEMVAL:
 974     case UNOP_CAST:
 975       fprintf_filtered (stream, "Type @");
 976       gdb_print_host_address (exp->elts[elt].type, stream);
 977       fprintf_filtered (stream, " (");
 978       type_print (exp->elts[elt].type, NULL, stream, 0);
 979       fprintf_filtered (stream, ")");
 980       elt = dump_subexp (exp, stream, elt + 2);
 981       break;
 982     case OP_TYPE:
 983       fprintf_filtered (stream, "Type @");
 984       gdb_print_host_address (exp->elts[elt].type, stream);
 985       fprintf_filtered (stream, " (");
 986       type_print (exp->elts[elt].type, NULL, stream, 0);
 987       fprintf_filtered (stream, ")");
 988       elt += 2;
 989       break;
 990     case OP_TYPEOF:
 991     case OP_DECLTYPE:
 992       fprintf_filtered (stream, "Typeof (");
 993       elt = dump_subexp (exp, stream, elt);
 994       fprintf_filtered (stream, ")");
 995       break;
 996     case OP_TYPEID:
 997       fprintf_filtered (stream, "typeid (");
 998       elt = dump_subexp (exp, stream, elt);
 999       fprintf_filtered (stream, ")");
1000       break;
1001     case STRUCTOP_STRUCT:
1002     case STRUCTOP_PTR:
1003       {
1004         char *elem_name;
1005         int len;
1006
1007         len = longest_to_int (exp->elts[elt].longconst);
1008         elem_name = &exp->elts[elt + 1].string;
1009
1010         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1011         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1012       }
1013       break;
1014     case OP_SCOPE:
1015       {
1016         char *elem_name;
1017         int len;
1018
1019         fprintf_filtered (stream, "Type @");
1020         gdb_print_host_address (exp->elts[elt].type, stream);
1021         fprintf_filtered (stream, " (");
1022         type_print (exp->elts[elt].type, NULL, stream, 0);
1023         fprintf_filtered (stream, ") ");
1024
1025         len = longest_to_int (exp->elts[elt + 1].longconst);
1026         elem_name = &exp->elts[elt + 2].string;
1027
1028         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1029         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1030       }
1031       break;
1032
1033     case OP_FUNC_STATIC_VAR:
1034       {
1035         int len = longest_to_int (exp->elts[elt].longconst);
1036         const char *var_name = &exp->elts[elt + 1].string;
1037         fprintf_filtered (stream, "Field name: `%.*s'", len, var_name);
1038         elt += 3 + BYTES_TO_EXP_ELEM (len + 1);
1039       }
1040       break;
1041
1042     case TYPE_INSTANCE:
1043       {
1044         type_instance_flags flags
1045           = (type_instance_flag_value) longest_to_int (exp->elts[elt++].longconst);
1046         LONGEST len = exp->elts[elt++].longconst;
1047         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
1048         while (len-- > 0)
1049           {
1050             fprintf_filtered (stream, "Type @");
1051             gdb_print_host_address (exp->elts[elt].type, stream);
1052             fprintf_filtered (stream, " (");
1053             type_print (exp->elts[elt].type, NULL, stream, 0);
1054             fprintf_filtered (stream, ")");
1055             elt++;
1056             if (len > 0)
1057               fputs_filtered (", ", stream);
1058           }
1059
1060         fprintf_filtered (stream, " Flags: %s (", hex_string (flags));
1061         bool space = false;
1062         auto print_one = [&] (const char *mod)
1063           {
1064             if (space)
1065               fputs_filtered (" ", stream);
1066             space = true;
1067             fprintf_filtered (stream, "%s", mod);
1068           };
1069         if (flags & TYPE_INSTANCE_FLAG_CONST)
1070           print_one ("const");
1071         if (flags & TYPE_INSTANCE_FLAG_VOLATILE)
1072           print_one ("volatile");
1073         fprintf_filtered (stream, ")");
1074
1075         /* Ending LEN and ending TYPE_INSTANCE.  */
1076         elt += 2;
1077         elt = dump_subexp (exp, stream, elt);
1078       }
1079       break;
1080     case OP_STRING:
1081       {
1082         LONGEST len = exp->elts[elt].longconst;
1083         LONGEST type = exp->elts[elt + 1].longconst;
1084
1085         fprintf_filtered (stream, "Language-specific string type: %s",
1086                           plongest (type));
1087
1088         /* Skip length.  */
1089         elt += 1;
1090
1091         /* Skip string content. */
1092         elt += BYTES_TO_EXP_ELEM (len);
1093
1094         /* Skip length and ending OP_STRING. */
1095         elt += 2;
1096       }
1097       break;
1098     case OP_RANGE:
1099       {
1100         enum range_type range_type;
1101
1102         range_type = (enum range_type)
1103           longest_to_int (exp->elts[elt].longconst);
1104         elt += 2;
1105
1106         switch (range_type)
1107           {
1108           case BOTH_BOUND_DEFAULT:
1109             fputs_filtered ("Range '..'", stream);
1110             break;
1111           case LOW_BOUND_DEFAULT:
1112             fputs_filtered ("Range '..EXP'", stream);
1113             break;
1114           case LOW_BOUND_DEFAULT_EXCLUSIVE:
1115             fputs_filtered ("ExclusiveRange '..EXP'", stream);
1116             break;
1117           case HIGH_BOUND_DEFAULT:
1118             fputs_filtered ("Range 'EXP..'", stream);
1119             break;
1120           case NONE_BOUND_DEFAULT:
1121             fputs_filtered ("Range 'EXP..EXP'", stream);
1122             break;
1123           case NONE_BOUND_DEFAULT_EXCLUSIVE:
1124             fputs_filtered ("ExclusiveRange 'EXP..EXP'", stream);
1125             break;
1126           default:
1127             fputs_filtered ("Invalid Range!", stream);
1128             break;
1129           }
1130
1131         if (range_type == HIGH_BOUND_DEFAULT
1132             || range_type == NONE_BOUND_DEFAULT)
1133           elt = dump_subexp (exp, stream, elt);
1134         if (range_type == LOW_BOUND_DEFAULT
1135             || range_type == NONE_BOUND_DEFAULT)
1136           elt = dump_subexp (exp, stream, elt);
1137       }
1138       break;
1139
1140     default:
1141     case OP_NULL:
1142     case MULTI_SUBSCRIPT:
1143     case OP_COMPLEX:
1144     case OP_BOOL:
1145     case OP_M2_STRING:
1146     case OP_THIS:
1147     case OP_NAME:
1148       fprintf_filtered (stream, "Unknown format");
1149     }
1150
1151   return elt;
1152 }
1153
1154 void
1155 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1156 {
1157   int elt;
1158
1159   fprintf_filtered (stream, "Dump of expression @ ");
1160   gdb_print_host_address (exp, stream);
1161   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1162   print_expression (exp, stream);
1163   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1164                     exp->language_defn->la_name, exp->nelts,
1165                     (long) sizeof (union exp_element));
1166   fputs_filtered ("\n", stream);
1167
1168   for (elt = 0; elt < exp->nelts;)
1169     elt = dump_subexp (exp, stream, elt);
1170   fputs_filtered ("\n", stream);
1171 }