gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986-2014 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 <string.h>
  30 #include "block.h"
  31 #include "objfiles.h"
  32 #include "valprint.h"
  33
  34 #include <ctype.h>
  35
  36 void
  37 print_expression (struct expression *exp, struct ui_file *stream)
  38 {
  39   int pc = 0;
  40
  41   print_subexp (exp, &pc, stream, PREC_NULL);
  42 }
  43
  44 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  45    PREC is the precedence of the surrounding operator;
  46    if the precedence of the main operator of this subexpression is less,
  47    parentheses are needed here.  */
  48
  49 void
  50 print_subexp (struct expression *exp, int *pos,
  51               struct ui_file *stream, enum precedence prec)
  52 {
  53   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  54 }
  55
  56 /* Standard implementation of print_subexp for use in language_defn
  57    vectors.  */
  58 void
  59 print_subexp_standard (struct expression *exp, int *pos,
  60                        struct ui_file *stream, enum precedence prec)
  61 {
  62   unsigned tem;
  63   const struct op_print *op_print_tab;
  64   int pc;
  65   unsigned nargs;
  66   char *op_str;
  67   int assign_modify = 0;
  68   enum exp_opcode opcode;
  69   enum precedence myprec = PREC_NULL;
  70   /* Set to 1 for a right-associative operator.  */
  71   int assoc = 0;
  72   struct value *val;
  73   char *tempstr = NULL;
  74
  75   op_print_tab = exp->language_defn->la_op_print_tab;
  76   pc = (*pos)++;
  77   opcode = exp->elts[pc].opcode;
  78   switch (opcode)
  79     {
  80       /* Common ops */
  81
  82     case OP_TYPE:
  83       (*pos) += 2;
  84       type_print (exp->elts[pc + 1].type, "", stream, 0);
  85       return;
  86
  87     case OP_SCOPE:
  88       myprec = PREC_PREFIX;
  89       assoc = 0;
  90       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  91       fputs_filtered ("::", stream);
  92       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  93       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  94       fputs_filtered (&exp->elts[pc + 3].string, stream);
  95       return;
  96
  97     case OP_LONG:
  98       {
  99         struct value_print_options opts;
 100
 101         get_no_prettyformat_print_options (&opts);
 102         (*pos) += 3;
 103         value_print (value_from_longest (exp->elts[pc + 1].type,
 104                                          exp->elts[pc + 2].longconst),
 105                      stream, &opts);
 106       }
 107       return;
 108
 109     case OP_DOUBLE:
 110       {
 111         struct value_print_options opts;
 112
 113         get_no_prettyformat_print_options (&opts);
 114         (*pos) += 3;
 115         value_print (value_from_double (exp->elts[pc + 1].type,
 116                                         exp->elts[pc + 2].doubleconst),
 117                      stream, &opts);
 118       }
 119       return;
 120
 121     case OP_VAR_VALUE:
 122       {
 123         const struct block *b;
 124
 125         (*pos) += 3;
 126         b = exp->elts[pc + 1].block;
 127         if (b != NULL
 128             && BLOCK_FUNCTION (b) != NULL
 129             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 130           {
 131             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 132             fputs_filtered ("::", stream);
 133           }
 134         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 135       }
 136       return;
 137
 138     case OP_VAR_ENTRY_VALUE:
 139       {
 140         (*pos) += 2;
 141         fprintf_filtered (stream, "%s@entry",
 142                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 143       }
 144       return;
 145
 146     case OP_LAST:
 147       (*pos) += 2;
 148       fprintf_filtered (stream, "$%d",
 149                         longest_to_int (exp->elts[pc + 1].longconst));
 150       return;
 151
 152     case OP_REGISTER:
 153       {
 154         const char *name = &exp->elts[pc + 2].string;
 155
 156         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 157         fprintf_filtered (stream, "$%s", name);
 158         return;
 159       }
 160
 161     case OP_BOOL:
 162       (*pos) += 2;
 163       fprintf_filtered (stream, "%s",
 164                         longest_to_int (exp->elts[pc + 1].longconst)
 165                         ? "TRUE" : "FALSE");
 166       return;
 167
 168     case OP_INTERNALVAR:
 169       (*pos) += 2;
 170       fprintf_filtered (stream, "$%s",
 171                         internalvar_name (exp->elts[pc + 1].internalvar));
 172       return;
 173
 174     case OP_FUNCALL:
 175       (*pos) += 2;
 176       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 177       print_subexp (exp, pos, stream, PREC_SUFFIX);
 178       fputs_filtered (" (", stream);
 179       for (tem = 0; tem < nargs; tem++)
 180         {
 181           if (tem != 0)
 182             fputs_filtered (", ", stream);
 183           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 184         }
 185       fputs_filtered (")", stream);
 186       return;
 187
 188     case OP_NAME:
 189       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 190       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 191       fputs_filtered (&exp->elts[pc + 2].string, stream);
 192       return;
 193
 194     case OP_STRING:
 195       {
 196         struct value_print_options opts;
 197
 198         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 199         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 200         /* LA_PRINT_STRING will print using the current repeat count threshold.
 201            If necessary, we can temporarily set it to zero, or pass it as an
 202            additional parameter to LA_PRINT_STRING.  -fnf */
 203         get_user_print_options (&opts);
 204         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 205                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 206                          NULL, 0, &opts);
 207       }
 208       return;
 209
 210     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 211                                    NSString constant.  */
 212       {
 213         struct value_print_options opts;
 214
 215         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 216         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 217         fputs_filtered ("@\"", stream);
 218         get_user_print_options (&opts);
 219         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 220                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
 221                          NULL, 0, &opts);
 222         fputs_filtered ("\"", stream);
 223       }
 224       return;
 225
 226     case OP_OBJC_MSGCALL:
 227       {                 /* Objective C message (method) call.  */
 228         char *selector;
 229
 230         (*pos) += 3;
 231         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 232         fprintf_unfiltered (stream, "[");
 233         print_subexp (exp, pos, stream, PREC_SUFFIX);
 234         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 235                                      &selector, 1024, NULL))
 236           {
 237             error (_("bad selector"));
 238             return;
 239           }
 240         if (nargs)
 241           {
 242             char *s, *nextS;
 243
 244             s = alloca (strlen (selector) + 1);
 245             strcpy (s, selector);
 246             for (tem = 0; tem < nargs; tem++)
 247               {
 248                 nextS = strchr (s, ':');
 249                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 250                 *nextS = '\0';
 251                 fprintf_unfiltered (stream, " %s: ", s);
 252                 s = nextS + 1;
 253                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 254               }
 255           }
 256         else
 257           {
 258             fprintf_unfiltered (stream, " %s", selector);
 259           }
 260         fprintf_unfiltered (stream, "]");
 261         /* "selector" was malloc'd by target_read_string.  Free it.  */
 262         xfree (selector);
 263         return;
 264       }
 265
 266     case OP_ARRAY:
 267       (*pos) += 3;
 268       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 269       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 270       nargs++;
 271       tem = 0;
 272       if (exp->elts[pc + 4].opcode == OP_LONG
 273           && exp->elts[pc + 5].type
 274              == builtin_type (exp->gdbarch)->builtin_char
 275           && exp->language_defn->la_language == language_c)
 276         {
 277           /* Attempt to print C character arrays using string syntax.
 278              Walk through the args, picking up one character from each
 279              of the OP_LONG expression elements.  If any array element
 280              does not match our expection of what we should find for
 281              a simple string, revert back to array printing.  Note that
 282              the last expression element is an explicit null terminator
 283              byte, which doesn't get printed.  */
 284           tempstr = alloca (nargs);
 285           pc += 4;
 286           while (tem < nargs)
 287             {
 288               if (exp->elts[pc].opcode != OP_LONG
 289                   || exp->elts[pc + 1].type
 290                      != builtin_type (exp->gdbarch)->builtin_char)
 291                 {
 292                   /* Not a simple array of char, use regular array
 293                      printing.  */
 294                   tem = 0;
 295                   break;
 296                 }
 297               else
 298                 {
 299                   tempstr[tem++] =
 300                     longest_to_int (exp->elts[pc + 2].longconst);
 301                   pc += 4;
 302                 }
 303             }
 304         }
 305       if (tem > 0)
 306         {
 307           struct value_print_options opts;
 308
 309           get_user_print_options (&opts);
 310           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 311                            (gdb_byte *) tempstr, nargs - 1, NULL, 0, &opts);
 312           (*pos) = pc;
 313         }
 314       else
 315         {
 316           fputs_filtered (" {", stream);
 317           for (tem = 0; tem < nargs; tem++)
 318             {
 319               if (tem != 0)
 320                 {
 321                   fputs_filtered (", ", stream);
 322                 }
 323               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 324             }
 325           fputs_filtered ("}", stream);
 326         }
 327       return;
 328
 329     case TERNOP_COND:
 330       if ((int) prec > (int) PREC_COMMA)
 331         fputs_filtered ("(", stream);
 332       /* Print the subexpressions, forcing parentheses
 333          around any binary operations within them.
 334          This is more parentheses than are strictly necessary,
 335          but it looks clearer.  */
 336       print_subexp (exp, pos, stream, PREC_HYPER);
 337       fputs_filtered (" ? ", stream);
 338       print_subexp (exp, pos, stream, PREC_HYPER);
 339       fputs_filtered (" : ", stream);
 340       print_subexp (exp, pos, stream, PREC_HYPER);
 341       if ((int) prec > (int) PREC_COMMA)
 342         fputs_filtered (")", stream);
 343       return;
 344
 345     case TERNOP_SLICE:
 346       print_subexp (exp, pos, stream, PREC_SUFFIX);
 347       fputs_filtered ("(", stream);
 348       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 349       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 350       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 351       fputs_filtered (")", stream);
 352       return;
 353
 354     case STRUCTOP_STRUCT:
 355       tem = longest_to_int (exp->elts[pc + 1].longconst);
 356       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 357       print_subexp (exp, pos, stream, PREC_SUFFIX);
 358       fputs_filtered (".", stream);
 359       fputs_filtered (&exp->elts[pc + 2].string, stream);
 360       return;
 361
 362       /* Will not occur for Modula-2.  */
 363     case STRUCTOP_PTR:
 364       tem = longest_to_int (exp->elts[pc + 1].longconst);
 365       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 366       print_subexp (exp, pos, stream, PREC_SUFFIX);
 367       fputs_filtered ("->", stream);
 368       fputs_filtered (&exp->elts[pc + 2].string, stream);
 369       return;
 370
 371     case STRUCTOP_MEMBER:
 372       print_subexp (exp, pos, stream, PREC_SUFFIX);
 373       fputs_filtered (".*", stream);
 374       print_subexp (exp, pos, stream, PREC_SUFFIX);
 375       return;
 376
 377     case STRUCTOP_MPTR:
 378       print_subexp (exp, pos, stream, PREC_SUFFIX);
 379       fputs_filtered ("->*", stream);
 380       print_subexp (exp, pos, stream, PREC_SUFFIX);
 381       return;
 382
 383     case BINOP_SUBSCRIPT:
 384       print_subexp (exp, pos, stream, PREC_SUFFIX);
 385       fputs_filtered ("[", stream);
 386       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 387       fputs_filtered ("]", stream);
 388       return;
 389
 390     case UNOP_POSTINCREMENT:
 391       print_subexp (exp, pos, stream, PREC_SUFFIX);
 392       fputs_filtered ("++", stream);
 393       return;
 394
 395     case UNOP_POSTDECREMENT:
 396       print_subexp (exp, pos, stream, PREC_SUFFIX);
 397       fputs_filtered ("--", stream);
 398       return;
 399
 400     case UNOP_CAST:
 401       (*pos) += 2;
 402       if ((int) prec > (int) PREC_PREFIX)
 403         fputs_filtered ("(", stream);
 404       fputs_filtered ("(", stream);
 405       type_print (exp->elts[pc + 1].type, "", stream, 0);
 406       fputs_filtered (") ", stream);
 407       print_subexp (exp, pos, stream, PREC_PREFIX);
 408       if ((int) prec > (int) PREC_PREFIX)
 409         fputs_filtered (")", stream);
 410       return;
 411
 412     case UNOP_CAST_TYPE:
 413       if ((int) prec > (int) PREC_PREFIX)
 414         fputs_filtered ("(", stream);
 415       fputs_filtered ("(", stream);
 416       print_subexp (exp, pos, stream, PREC_PREFIX);
 417       fputs_filtered (") ", stream);
 418       print_subexp (exp, pos, stream, PREC_PREFIX);
 419       if ((int) prec > (int) PREC_PREFIX)
 420         fputs_filtered (")", stream);
 421       return;
 422
 423     case UNOP_DYNAMIC_CAST:
 424     case UNOP_REINTERPRET_CAST:
 425       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 426                       : "reinterpret_cast", stream);
 427       fputs_filtered ("<", stream);
 428       print_subexp (exp, pos, stream, PREC_PREFIX);
 429       fputs_filtered ("> (", stream);
 430       print_subexp (exp, pos, stream, PREC_PREFIX);
 431       fputs_filtered (")", stream);
 432       return;
 433
 434     case UNOP_MEMVAL:
 435       (*pos) += 2;
 436       if ((int) prec > (int) PREC_PREFIX)
 437         fputs_filtered ("(", stream);
 438       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 439           && exp->elts[pc + 3].opcode == OP_LONG)
 440         {
 441           struct value_print_options opts;
 442
 443           /* We have a minimal symbol fn, probably.  It's encoded
 444              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 445              Swallow the OP_LONG (including both its opcodes); ignore
 446              its type; print the value in the type of the MEMVAL.  */
 447           (*pos) += 4;
 448           val = value_at_lazy (exp->elts[pc + 1].type,
 449                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 450           get_no_prettyformat_print_options (&opts);
 451           value_print (val, stream, &opts);
 452         }
 453       else
 454         {
 455           fputs_filtered ("{", stream);
 456           type_print (exp->elts[pc + 1].type, "", stream, 0);
 457           fputs_filtered ("} ", stream);
 458           print_subexp (exp, pos, stream, PREC_PREFIX);
 459         }
 460       if ((int) prec > (int) PREC_PREFIX)
 461         fputs_filtered (")", stream);
 462       return;
 463
 464     case UNOP_MEMVAL_TYPE:
 465       if ((int) prec > (int) PREC_PREFIX)
 466         fputs_filtered ("(", stream);
 467       fputs_filtered ("{", stream);
 468       print_subexp (exp, pos, stream, PREC_PREFIX);
 469       fputs_filtered ("} ", stream);
 470       print_subexp (exp, pos, stream, PREC_PREFIX);
 471       if ((int) prec > (int) PREC_PREFIX)
 472         fputs_filtered (")", stream);
 473       return;
 474
 475     case UNOP_MEMVAL_TLS:
 476       (*pos) += 3;
 477       if ((int) prec > (int) PREC_PREFIX)
 478         fputs_filtered ("(", stream);
 479       fputs_filtered ("{", stream);
 480       type_print (exp->elts[pc + 2].type, "", stream, 0);
 481       fputs_filtered ("} ", stream);
 482       print_subexp (exp, pos, stream, PREC_PREFIX);
 483       if ((int) prec > (int) PREC_PREFIX)
 484         fputs_filtered (")", stream);
 485       return;
 486
 487     case BINOP_ASSIGN_MODIFY:
 488       opcode = exp->elts[pc + 1].opcode;
 489       (*pos) += 2;
 490       myprec = PREC_ASSIGN;
 491       assoc = 1;
 492       assign_modify = 1;
 493       op_str = "???";
 494       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 495         if (op_print_tab[tem].opcode == opcode)
 496           {
 497             op_str = op_print_tab[tem].string;
 498             break;
 499           }
 500       if (op_print_tab[tem].opcode != opcode)
 501         /* Not found; don't try to keep going because we don't know how
 502            to interpret further elements.  */
 503         error (_("Invalid expression"));
 504       break;
 505
 506       /* C++ ops */
 507
 508     case OP_THIS:
 509       ++(*pos);
 510       if (exp->language_defn->la_name_of_this)
 511         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 512       else
 513         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 514                           exp->language_defn->la_name);
 515       return;
 516
 517       /* Modula-2 ops */
 518
 519     case MULTI_SUBSCRIPT:
 520       (*pos) += 2;
 521       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 522       print_subexp (exp, pos, stream, PREC_SUFFIX);
 523       fprintf_unfiltered (stream, " [");
 524       for (tem = 0; tem < nargs; tem++)
 525         {
 526           if (tem != 0)
 527             fprintf_unfiltered (stream, ", ");
 528           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 529         }
 530       fprintf_unfiltered (stream, "]");
 531       return;
 532
 533     case BINOP_VAL:
 534       (*pos) += 2;
 535       fprintf_unfiltered (stream, "VAL(");
 536       type_print (exp->elts[pc + 1].type, "", stream, 0);
 537       fprintf_unfiltered (stream, ",");
 538       print_subexp (exp, pos, stream, PREC_PREFIX);
 539       fprintf_unfiltered (stream, ")");
 540       return;
 541
 542     case TYPE_INSTANCE:
 543       {
 544         LONGEST count = exp->elts[pc + 1].longconst;
 545
 546         /* The COUNT.  */
 547         (*pos)++;
 548         fputs_unfiltered ("TypesInstance(", stream);
 549         while (count-- > 0)
 550           {
 551             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 552             if (count > 0)
 553               fputs_unfiltered (",", stream);
 554           }
 555         fputs_unfiltered (",", stream);
 556         /* Ending COUNT and ending TYPE_INSTANCE.  */
 557         (*pos) += 2;
 558         print_subexp (exp, pos, stream, PREC_PREFIX);
 559         fputs_unfiltered (")", stream);
 560         return;
 561       }
 562
 563       /* Default ops */
 564
 565     default:
 566       op_str = "???";
 567       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 568         if (op_print_tab[tem].opcode == opcode)
 569           {
 570             op_str = op_print_tab[tem].string;
 571             myprec = op_print_tab[tem].precedence;
 572             assoc = op_print_tab[tem].right_assoc;
 573             break;
 574           }
 575       if (op_print_tab[tem].opcode != opcode)
 576         /* Not found; don't try to keep going because we don't know how
 577            to interpret further elements.  For example, this happens
 578            if opcode is OP_TYPE.  */
 579         error (_("Invalid expression"));
 580     }
 581
 582   /* Note that PREC_BUILTIN will always emit parentheses.  */
 583   if ((int) myprec < (int) prec)
 584     fputs_filtered ("(", stream);
 585   if ((int) opcode > (int) BINOP_END)
 586     {
 587       if (assoc)
 588         {
 589           /* Unary postfix operator.  */
 590           print_subexp (exp, pos, stream, PREC_SUFFIX);
 591           fputs_filtered (op_str, stream);
 592         }
 593       else
 594         {
 595           /* Unary prefix operator.  */
 596           fputs_filtered (op_str, stream);
 597           if (myprec == PREC_BUILTIN_FUNCTION)
 598             fputs_filtered ("(", stream);
 599           print_subexp (exp, pos, stream, PREC_PREFIX);
 600           if (myprec == PREC_BUILTIN_FUNCTION)
 601             fputs_filtered (")", stream);
 602         }
 603     }
 604   else
 605     {
 606       /* Binary operator.  */
 607       /* Print left operand.
 608          If operator is right-associative,
 609          increment precedence for this operand.  */
 610       print_subexp (exp, pos, stream,
 611                     (enum precedence) ((int) myprec + assoc));
 612       /* Print the operator itself.  */
 613       if (assign_modify)
 614         fprintf_filtered (stream, " %s= ", op_str);
 615       else if (op_str[0] == ',')
 616         fprintf_filtered (stream, "%s ", op_str);
 617       else
 618         fprintf_filtered (stream, " %s ", op_str);
 619       /* Print right operand.
 620          If operator is left-associative,
 621          increment precedence for this operand.  */
 622       print_subexp (exp, pos, stream,
 623                     (enum precedence) ((int) myprec + !assoc));
 624     }
 625
 626   if ((int) myprec < (int) prec)
 627     fputs_filtered (")", stream);
 628 }
 629
 630 /* Return the operator corresponding to opcode OP as
 631    a string.   NULL indicates that the opcode was not found in the
 632    current language table.  */
 633 char *
 634 op_string (enum exp_opcode op)
 635 {
 636   int tem;
 637   const struct op_print *op_print_tab;
 638
 639   op_print_tab = current_language->la_op_print_tab;
 640   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 641     if (op_print_tab[tem].opcode == op)
 642       return op_print_tab[tem].string;
 643   return NULL;
 644 }
 645
 646 /* Support for dumping the raw data from expressions in a human readable
 647    form.  */
 648
 649 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 650
 651 /* Name for OPCODE, when it appears in expression EXP.  */
 652
 653 char *
 654 op_name (struct expression *exp, enum exp_opcode opcode)
 655 {
 656   return exp->language_defn->la_exp_desc->op_name (opcode);
 657 }
 658
 659 /* Default name for the standard operator OPCODE (i.e., one defined in
 660    the definition of enum exp_opcode).  */
 661
 662 char *
 663 op_name_standard (enum exp_opcode opcode)
 664 {
 665   switch (opcode)
 666     {
 667     default:
 668       {
 669         static char buf[30];
 670
 671         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 672         return buf;
 673       }
 674 #define OP(name)        \
 675     case name:          \
 676       return #name ;
 677 #include "std-operator.def"
 678 #undef OP
 679     }
 680 }
 681
 682 /* Print a raw dump of expression EXP to STREAM.
 683    NOTE, if non-NULL, is printed as extra explanatory text.  */
 684
 685 void
 686 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 687                      char *note)
 688 {
 689   int elt;
 690   char *opcode_name;
 691   char *eltscan;
 692   int eltsize;
 693
 694   fprintf_filtered (stream, "Dump of expression @ ");
 695   gdb_print_host_address (exp, stream);
 696   if (note)
 697     fprintf_filtered (stream, ", %s:", note);
 698   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 699                     exp->language_defn->la_name, exp->nelts,
 700                     (long) sizeof (union exp_element));
 701   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 702                     "Hex Value", "String Value");
 703   for (elt = 0; elt < exp->nelts; elt++)
 704     {
 705       fprintf_filtered (stream, "\t%5d  ", elt);
 706       opcode_name = op_name (exp, exp->elts[elt].opcode);
 707
 708       fprintf_filtered (stream, "%20s  ", opcode_name);
 709       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 710       fprintf_filtered (stream, "  ");
 711
 712       for (eltscan = (char *) &exp->elts[elt],
 713            eltsize = sizeof (union exp_element);
 714            eltsize-- > 0;
 715            eltscan++)
 716         {
 717           fprintf_filtered (stream, "%c",
 718                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 719         }
 720       fprintf_filtered (stream, "\n");
 721     }
 722 }
 723
 724 /* Dump the subexpression of prefix expression EXP whose operator is at
 725    position ELT onto STREAM.  Returns the position of the next
 726    subexpression in EXP.  */
 727
 728 int
 729 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 730 {
 731   static int indent = 0;
 732   int i;
 733
 734   fprintf_filtered (stream, "\n");
 735   fprintf_filtered (stream, "\t%5d  ", elt);
 736
 737   for (i = 1; i <= indent; i++)
 738     fprintf_filtered (stream, " ");
 739   indent += 2;
 740
 741   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 742
 743   elt = dump_subexp_body (exp, stream, elt);
 744
 745   indent -= 2;
 746
 747   return elt;
 748 }
 749
 750 /* Dump the operands of prefix expression EXP whose opcode is at
 751    position ELT onto STREAM.  Returns the position of the next
 752    subexpression in EXP.  */
 753
 754 static int
 755 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 756 {
 757   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 758 }
 759
 760 /* Default value for subexp_body in exp_descriptor vector.  */
 761
 762 int
 763 dump_subexp_body_standard (struct expression *exp,
 764                            struct ui_file *stream, int elt)
 765 {
 766   int opcode = exp->elts[elt++].opcode;
 767
 768   switch (opcode)
 769     {
 770     case TERNOP_COND:
 771     case TERNOP_SLICE:
 772       elt = dump_subexp (exp, stream, elt);
 773       /* FALL THROUGH */
 774     case BINOP_ADD:
 775     case BINOP_SUB:
 776     case BINOP_MUL:
 777     case BINOP_DIV:
 778     case BINOP_REM:
 779     case BINOP_MOD:
 780     case BINOP_LSH:
 781     case BINOP_RSH:
 782     case BINOP_LOGICAL_AND:
 783     case BINOP_LOGICAL_OR:
 784     case BINOP_BITWISE_AND:
 785     case BINOP_BITWISE_IOR:
 786     case BINOP_BITWISE_XOR:
 787     case BINOP_EQUAL:
 788     case BINOP_NOTEQUAL:
 789     case BINOP_LESS:
 790     case BINOP_GTR:
 791     case BINOP_LEQ:
 792     case BINOP_GEQ:
 793     case BINOP_REPEAT:
 794     case BINOP_ASSIGN:
 795     case BINOP_COMMA:
 796     case BINOP_SUBSCRIPT:
 797     case BINOP_EXP:
 798     case BINOP_MIN:
 799     case BINOP_MAX:
 800     case BINOP_INTDIV:
 801     case BINOP_ASSIGN_MODIFY:
 802     case BINOP_VAL:
 803     case BINOP_CONCAT:
 804     case BINOP_END:
 805     case STRUCTOP_MEMBER:
 806     case STRUCTOP_MPTR:
 807       elt = dump_subexp (exp, stream, elt);
 808       /* FALL THROUGH */
 809     case UNOP_NEG:
 810     case UNOP_LOGICAL_NOT:
 811     case UNOP_COMPLEMENT:
 812     case UNOP_IND:
 813     case UNOP_ADDR:
 814     case UNOP_PREINCREMENT:
 815     case UNOP_POSTINCREMENT:
 816     case UNOP_PREDECREMENT:
 817     case UNOP_POSTDECREMENT:
 818     case UNOP_SIZEOF:
 819     case UNOP_PLUS:
 820     case UNOP_CAP:
 821     case UNOP_CHR:
 822     case UNOP_ORD:
 823     case UNOP_ABS:
 824     case UNOP_FLOAT:
 825     case UNOP_HIGH:
 826     case UNOP_MAX:
 827     case UNOP_MIN:
 828     case UNOP_ODD:
 829     case UNOP_TRUNC:
 830       elt = dump_subexp (exp, stream, elt);
 831       break;
 832     case OP_LONG:
 833       fprintf_filtered (stream, "Type @");
 834       gdb_print_host_address (exp->elts[elt].type, stream);
 835       fprintf_filtered (stream, " (");
 836       type_print (exp->elts[elt].type, NULL, stream, 0);
 837       fprintf_filtered (stream, "), value %ld (0x%lx)",
 838                         (long) exp->elts[elt + 1].longconst,
 839                         (long) exp->elts[elt + 1].longconst);
 840       elt += 3;
 841       break;
 842     case OP_DOUBLE:
 843       fprintf_filtered (stream, "Type @");
 844       gdb_print_host_address (exp->elts[elt].type, stream);
 845       fprintf_filtered (stream, " (");
 846       type_print (exp->elts[elt].type, NULL, stream, 0);
 847       fprintf_filtered (stream, "), value %g",
 848                         (double) exp->elts[elt + 1].doubleconst);
 849       elt += 3;
 850       break;
 851     case OP_VAR_VALUE:
 852       fprintf_filtered (stream, "Block @");
 853       gdb_print_host_address (exp->elts[elt].block, stream);
 854       fprintf_filtered (stream, ", symbol @");
 855       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 856       fprintf_filtered (stream, " (%s)",
 857                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 858       elt += 3;
 859       break;
 860     case OP_VAR_ENTRY_VALUE:
 861       fprintf_filtered (stream, "Entry value of symbol @");
 862       gdb_print_host_address (exp->elts[elt].symbol, stream);
 863       fprintf_filtered (stream, " (%s)",
 864                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 865       elt += 2;
 866       break;
 867     case OP_LAST:
 868       fprintf_filtered (stream, "History element %ld",
 869                         (long) exp->elts[elt].longconst);
 870       elt += 2;
 871       break;
 872     case OP_REGISTER:
 873       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 874       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 875       break;
 876     case OP_INTERNALVAR:
 877       fprintf_filtered (stream, "Internal var @");
 878       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 879       fprintf_filtered (stream, " (%s)",
 880                         internalvar_name (exp->elts[elt].internalvar));
 881       elt += 2;
 882       break;
 883     case OP_FUNCALL:
 884       {
 885         int i, nargs;
 886
 887         nargs = longest_to_int (exp->elts[elt].longconst);
 888
 889         fprintf_filtered (stream, "Number of args: %d", nargs);
 890         elt += 2;
 891
 892         for (i = 1; i <= nargs + 1; i++)
 893           elt = dump_subexp (exp, stream, elt);
 894       }
 895       break;
 896     case OP_ARRAY:
 897       {
 898         int lower, upper;
 899         int i;
 900
 901         lower = longest_to_int (exp->elts[elt].longconst);
 902         upper = longest_to_int (exp->elts[elt + 1].longconst);
 903
 904         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 905         elt += 3;
 906
 907         for (i = 1; i <= upper - lower + 1; i++)
 908           elt = dump_subexp (exp, stream, elt);
 909       }
 910       break;
 911     case UNOP_DYNAMIC_CAST:
 912     case UNOP_REINTERPRET_CAST:
 913     case UNOP_CAST_TYPE:
 914     case UNOP_MEMVAL_TYPE:
 915       fprintf_filtered (stream, " (");
 916       elt = dump_subexp (exp, stream, elt);
 917       fprintf_filtered (stream, ")");
 918       elt = dump_subexp (exp, stream, elt);
 919       break;
 920     case UNOP_MEMVAL:
 921     case UNOP_CAST:
 922       fprintf_filtered (stream, "Type @");
 923       gdb_print_host_address (exp->elts[elt].type, stream);
 924       fprintf_filtered (stream, " (");
 925       type_print (exp->elts[elt].type, NULL, stream, 0);
 926       fprintf_filtered (stream, ")");
 927       elt = dump_subexp (exp, stream, elt + 2);
 928       break;
 929     case UNOP_MEMVAL_TLS:
 930       fprintf_filtered (stream, "TLS type @");
 931       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 932       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 933                         (exp->elts[elt].objfile == NULL ? "(null)"
 934                          : objfile_name (exp->elts[elt].objfile)));
 935       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 936       fprintf_filtered (stream, ")");
 937       elt = dump_subexp (exp, stream, elt + 3);
 938       break;
 939     case OP_TYPE:
 940       fprintf_filtered (stream, "Type @");
 941       gdb_print_host_address (exp->elts[elt].type, stream);
 942       fprintf_filtered (stream, " (");
 943       type_print (exp->elts[elt].type, NULL, stream, 0);
 944       fprintf_filtered (stream, ")");
 945       elt += 2;
 946       break;
 947     case OP_TYPEOF:
 948     case OP_DECLTYPE:
 949       fprintf_filtered (stream, "Typeof (");
 950       elt = dump_subexp (exp, stream, elt);
 951       fprintf_filtered (stream, ")");
 952       break;
 953     case OP_TYPEID:
 954       fprintf_filtered (stream, "typeid (");
 955       elt = dump_subexp (exp, stream, elt);
 956       fprintf_filtered (stream, ")");
 957       break;
 958     case STRUCTOP_STRUCT:
 959     case STRUCTOP_PTR:
 960       {
 961         char *elem_name;
 962         int len;
 963
 964         len = longest_to_int (exp->elts[elt].longconst);
 965         elem_name = &exp->elts[elt + 1].string;
 966
 967         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 968         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 969       }
 970       break;
 971     case OP_SCOPE:
 972       {
 973         char *elem_name;
 974         int len;
 975
 976         fprintf_filtered (stream, "Type @");
 977         gdb_print_host_address (exp->elts[elt].type, stream);
 978         fprintf_filtered (stream, " (");
 979         type_print (exp->elts[elt].type, NULL, stream, 0);
 980         fprintf_filtered (stream, ") ");
 981
 982         len = longest_to_int (exp->elts[elt + 1].longconst);
 983         elem_name = &exp->elts[elt + 2].string;
 984
 985         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
 986         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
 987       }
 988       break;
 989     case TYPE_INSTANCE:
 990       {
 991         LONGEST len;
 992
 993         len = exp->elts[elt++].longconst;
 994         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
 995         while (len-- > 0)
 996           {
 997             fprintf_filtered (stream, "Type @");
 998             gdb_print_host_address (exp->elts[elt].type, stream);
 999             fprintf_filtered (stream, " (");
1000             type_print (exp->elts[elt].type, NULL, stream, 0);
1001             fprintf_filtered (stream, ")");
1002             elt++;
1003             if (len > 0)
1004               fputs_filtered (", ", stream);
1005           }
1006         /* Ending LEN and ending TYPE_INSTANCE.  */
1007         elt += 2;
1008         elt = dump_subexp (exp, stream, elt);
1009       }
1010       break;
1011     case OP_STRING:
1012       {
1013         LONGEST len = exp->elts[elt].longconst;
1014         LONGEST type = exp->elts[elt + 1].longconst;
1015
1016         fprintf_filtered (stream, "Language-specific string type: %s",
1017                           plongest (type));
1018
1019         /* Skip length.  */
1020         elt += 1;
1021
1022         /* Skip string content. */
1023         elt += BYTES_TO_EXP_ELEM (len);
1024
1025         /* Skip length and ending OP_STRING. */
1026         elt += 2;
1027       }
1028       break;
1029     default:
1030     case OP_NULL:
1031     case MULTI_SUBSCRIPT:
1032     case OP_F77_UNDETERMINED_ARGLIST:
1033     case OP_COMPLEX:
1034     case OP_BOOL:
1035     case OP_M2_STRING:
1036     case OP_THIS:
1037     case OP_NAME:
1038       fprintf_filtered (stream, "Unknown format");
1039     }
1040
1041   return elt;
1042 }
1043
1044 void
1045 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1046 {
1047   int elt;
1048
1049   fprintf_filtered (stream, "Dump of expression @ ");
1050   gdb_print_host_address (exp, stream);
1051   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1052   print_expression (exp, stream);
1053   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1054                     exp->language_defn->la_name, exp->nelts,
1055                     (long) sizeof (union exp_element));
1056   fputs_filtered ("\n", stream);
1057
1058   for (elt = 0; elt < exp->nelts;)
1059     elt = dump_subexp (exp, stream, elt);
1060   fputs_filtered ("\n", stream);
1061 }