gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986-2013 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 "gdb_string.h"
  30 #include "block.h"
  31 #include "objfiles.h"
  32 #include "gdb_assert.h"
  33 #include "valprint.h"
  34
  35 #include <ctype.h>
  36
  37 void
  38 print_expression (struct expression *exp, struct ui_file *stream)
  39 {
  40   int pc = 0;
  41
  42   print_subexp (exp, &pc, stream, PREC_NULL);
  43 }
  44
  45 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  46    PREC is the precedence of the surrounding operator;
  47    if the precedence of the main operator of this subexpression is less,
  48    parentheses are needed here.  */
  49
  50 void
  51 print_subexp (struct expression *exp, int *pos,
  52               struct ui_file *stream, enum precedence prec)
  53 {
  54   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  55 }
  56
  57 /* Standard implementation of print_subexp for use in language_defn
  58    vectors.  */
  59 void
  60 print_subexp_standard (struct expression *exp, int *pos,
  61                        struct ui_file *stream, enum precedence prec)
  62 {
  63   unsigned tem;
  64   const struct op_print *op_print_tab;
  65   int pc;
  66   unsigned nargs;
  67   char *op_str;
  68   int assign_modify = 0;
  69   enum exp_opcode opcode;
  70   enum precedence myprec = PREC_NULL;
  71   /* Set to 1 for a right-associative operator.  */
  72   int assoc = 0;
  73   struct value *val;
  74   char *tempstr = NULL;
  75
  76   op_print_tab = exp->language_defn->la_op_print_tab;
  77   pc = (*pos)++;
  78   opcode = exp->elts[pc].opcode;
  79   switch (opcode)
  80     {
  81       /* Common ops */
  82
  83     case OP_TYPE:
  84       (*pos) += 2;
  85       type_print (exp->elts[pc + 1].type, "", stream, 0);
  86       return;
  87
  88     case OP_SCOPE:
  89       myprec = PREC_PREFIX;
  90       assoc = 0;
  91       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  92       fputs_filtered ("::", stream);
  93       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  94       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  95       fputs_filtered (&exp->elts[pc + 3].string, stream);
  96       return;
  97
  98     case OP_LONG:
  99       {
 100         struct value_print_options opts;
 101
 102         get_raw_print_options (&opts);
 103         (*pos) += 3;
 104         value_print (value_from_longest (exp->elts[pc + 1].type,
 105                                          exp->elts[pc + 2].longconst),
 106                      stream, &opts);
 107       }
 108       return;
 109
 110     case OP_DOUBLE:
 111       {
 112         struct value_print_options opts;
 113
 114         get_raw_print_options (&opts);
 115         (*pos) += 3;
 116         value_print (value_from_double (exp->elts[pc + 1].type,
 117                                         exp->elts[pc + 2].doubleconst),
 118                      stream, &opts);
 119       }
 120       return;
 121
 122     case OP_VAR_VALUE:
 123       {
 124         const struct block *b;
 125
 126         (*pos) += 3;
 127         b = exp->elts[pc + 1].block;
 128         if (b != NULL
 129             && BLOCK_FUNCTION (b) != NULL
 130             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 131           {
 132             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 133             fputs_filtered ("::", stream);
 134           }
 135         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 136       }
 137       return;
 138
 139     case OP_VAR_ENTRY_VALUE:
 140       {
 141         (*pos) += 2;
 142         fprintf_filtered (stream, "%s@entry",
 143                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 144       }
 145       return;
 146
 147     case OP_LAST:
 148       (*pos) += 2;
 149       fprintf_filtered (stream, "$%d",
 150                         longest_to_int (exp->elts[pc + 1].longconst));
 151       return;
 152
 153     case OP_REGISTER:
 154       {
 155         const char *name = &exp->elts[pc + 2].string;
 156
 157         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 158         fprintf_filtered (stream, "$%s", name);
 159         return;
 160       }
 161
 162     case OP_BOOL:
 163       (*pos) += 2;
 164       fprintf_filtered (stream, "%s",
 165                         longest_to_int (exp->elts[pc + 1].longconst)
 166                         ? "TRUE" : "FALSE");
 167       return;
 168
 169     case OP_INTERNALVAR:
 170       (*pos) += 2;
 171       fprintf_filtered (stream, "$%s",
 172                         internalvar_name (exp->elts[pc + 1].internalvar));
 173       return;
 174
 175     case OP_FUNCALL:
 176       (*pos) += 2;
 177       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 178       print_subexp (exp, pos, stream, PREC_SUFFIX);
 179       fputs_filtered (" (", stream);
 180       for (tem = 0; tem < nargs; tem++)
 181         {
 182           if (tem != 0)
 183             fputs_filtered (", ", stream);
 184           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 185         }
 186       fputs_filtered (")", stream);
 187       return;
 188
 189     case OP_NAME:
 190       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 191       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 192       fputs_filtered (&exp->elts[pc + 2].string, stream);
 193       return;
 194
 195     case OP_STRING:
 196       {
 197         struct value_print_options opts;
 198
 199         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 200         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 201         /* LA_PRINT_STRING will print using the current repeat count threshold.
 202            If necessary, we can temporarily set it to zero, or pass it as an
 203            additional parameter to LA_PRINT_STRING.  -fnf */
 204         get_user_print_options (&opts);
 205         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 206                          &exp->elts[pc + 2].string, nargs, 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                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 221         fputs_filtered ("\"", stream);
 222       }
 223       return;
 224
 225     case OP_OBJC_MSGCALL:
 226       {                 /* Objective C message (method) call.  */
 227         char *selector;
 228
 229         (*pos) += 3;
 230         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 231         fprintf_unfiltered (stream, "[");
 232         print_subexp (exp, pos, stream, PREC_SUFFIX);
 233         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 234                                      &selector, 1024, NULL))
 235           {
 236             error (_("bad selector"));
 237             return;
 238           }
 239         if (nargs)
 240           {
 241             char *s, *nextS;
 242
 243             s = alloca (strlen (selector) + 1);
 244             strcpy (s, selector);
 245             for (tem = 0; tem < nargs; tem++)
 246               {
 247                 nextS = strchr (s, ':');
 248                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 249                 *nextS = '\0';
 250                 fprintf_unfiltered (stream, " %s: ", s);
 251                 s = nextS + 1;
 252                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 253               }
 254           }
 255         else
 256           {
 257             fprintf_unfiltered (stream, " %s", selector);
 258           }
 259         fprintf_unfiltered (stream, "]");
 260         /* "selector" was malloc'd by target_read_string.  Free it.  */
 261         xfree (selector);
 262         return;
 263       }
 264
 265     case OP_ARRAY:
 266       (*pos) += 3;
 267       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 268       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 269       nargs++;
 270       tem = 0;
 271       if (exp->elts[pc + 4].opcode == OP_LONG
 272           && exp->elts[pc + 5].type
 273              == builtin_type (exp->gdbarch)->builtin_char
 274           && exp->language_defn->la_language == language_c)
 275         {
 276           /* Attempt to print C character arrays using string syntax.
 277              Walk through the args, picking up one character from each
 278              of the OP_LONG expression elements.  If any array element
 279              does not match our expection of what we should find for
 280              a simple string, revert back to array printing.  Note that
 281              the last expression element is an explicit null terminator
 282              byte, which doesn't get printed.  */
 283           tempstr = alloca (nargs);
 284           pc += 4;
 285           while (tem < nargs)
 286             {
 287               if (exp->elts[pc].opcode != OP_LONG
 288                   || exp->elts[pc + 1].type
 289                      != builtin_type (exp->gdbarch)->builtin_char)
 290                 {
 291                   /* Not a simple array of char, use regular array
 292                      printing.  */
 293                   tem = 0;
 294                   break;
 295                 }
 296               else
 297                 {
 298                   tempstr[tem++] =
 299                     longest_to_int (exp->elts[pc + 2].longconst);
 300                   pc += 4;
 301                 }
 302             }
 303         }
 304       if (tem > 0)
 305         {
 306           struct value_print_options opts;
 307
 308           get_user_print_options (&opts);
 309           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 310                            tempstr, nargs - 1, NULL, 0, &opts);
 311           (*pos) = pc;
 312         }
 313       else
 314         {
 315           fputs_filtered (" {", stream);
 316           for (tem = 0; tem < nargs; tem++)
 317             {
 318               if (tem != 0)
 319                 {
 320                   fputs_filtered (", ", stream);
 321                 }
 322               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 323             }
 324           fputs_filtered ("}", stream);
 325         }
 326       return;
 327
 328     case TERNOP_COND:
 329       if ((int) prec > (int) PREC_COMMA)
 330         fputs_filtered ("(", stream);
 331       /* Print the subexpressions, forcing parentheses
 332          around any binary operations within them.
 333          This is more parentheses than are strictly necessary,
 334          but it looks clearer.  */
 335       print_subexp (exp, pos, stream, PREC_HYPER);
 336       fputs_filtered (" ? ", stream);
 337       print_subexp (exp, pos, stream, PREC_HYPER);
 338       fputs_filtered (" : ", stream);
 339       print_subexp (exp, pos, stream, PREC_HYPER);
 340       if ((int) prec > (int) PREC_COMMA)
 341         fputs_filtered (")", stream);
 342       return;
 343
 344     case TERNOP_SLICE:
 345       print_subexp (exp, pos, stream, PREC_SUFFIX);
 346       fputs_filtered ("(", stream);
 347       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 348       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 349       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 350       fputs_filtered (")", stream);
 351       return;
 352
 353     case STRUCTOP_STRUCT:
 354       tem = longest_to_int (exp->elts[pc + 1].longconst);
 355       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 356       print_subexp (exp, pos, stream, PREC_SUFFIX);
 357       fputs_filtered (".", stream);
 358       fputs_filtered (&exp->elts[pc + 2].string, stream);
 359       return;
 360
 361       /* Will not occur for Modula-2.  */
 362     case STRUCTOP_PTR:
 363       tem = longest_to_int (exp->elts[pc + 1].longconst);
 364       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 365       print_subexp (exp, pos, stream, PREC_SUFFIX);
 366       fputs_filtered ("->", stream);
 367       fputs_filtered (&exp->elts[pc + 2].string, stream);
 368       return;
 369
 370     case STRUCTOP_MEMBER:
 371       print_subexp (exp, pos, stream, PREC_SUFFIX);
 372       fputs_filtered (".*", stream);
 373       print_subexp (exp, pos, stream, PREC_SUFFIX);
 374       return;
 375
 376     case STRUCTOP_MPTR:
 377       print_subexp (exp, pos, stream, PREC_SUFFIX);
 378       fputs_filtered ("->*", stream);
 379       print_subexp (exp, pos, stream, PREC_SUFFIX);
 380       return;
 381
 382     case BINOP_SUBSCRIPT:
 383       print_subexp (exp, pos, stream, PREC_SUFFIX);
 384       fputs_filtered ("[", stream);
 385       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 386       fputs_filtered ("]", stream);
 387       return;
 388
 389     case UNOP_POSTINCREMENT:
 390       print_subexp (exp, pos, stream, PREC_SUFFIX);
 391       fputs_filtered ("++", stream);
 392       return;
 393
 394     case UNOP_POSTDECREMENT:
 395       print_subexp (exp, pos, stream, PREC_SUFFIX);
 396       fputs_filtered ("--", stream);
 397       return;
 398
 399     case UNOP_CAST:
 400       (*pos) += 2;
 401       if ((int) prec > (int) PREC_PREFIX)
 402         fputs_filtered ("(", stream);
 403       fputs_filtered ("(", stream);
 404       type_print (exp->elts[pc + 1].type, "", stream, 0);
 405       fputs_filtered (") ", stream);
 406       print_subexp (exp, pos, stream, PREC_PREFIX);
 407       if ((int) prec > (int) PREC_PREFIX)
 408         fputs_filtered (")", stream);
 409       return;
 410
 411     case UNOP_CAST_TYPE:
 412       if ((int) prec > (int) PREC_PREFIX)
 413         fputs_filtered ("(", stream);
 414       fputs_filtered ("(", stream);
 415       print_subexp (exp, pos, stream, PREC_PREFIX);
 416       fputs_filtered (") ", stream);
 417       print_subexp (exp, pos, stream, PREC_PREFIX);
 418       if ((int) prec > (int) PREC_PREFIX)
 419         fputs_filtered (")", stream);
 420       return;
 421
 422     case UNOP_DYNAMIC_CAST:
 423     case UNOP_REINTERPRET_CAST:
 424       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 425                       : "reinterpret_cast", stream);
 426       fputs_filtered ("<", stream);
 427       print_subexp (exp, pos, stream, PREC_PREFIX);
 428       fputs_filtered ("> (", stream);
 429       print_subexp (exp, pos, stream, PREC_PREFIX);
 430       fputs_filtered (")", stream);
 431       return;
 432
 433     case UNOP_MEMVAL:
 434       (*pos) += 2;
 435       if ((int) prec > (int) PREC_PREFIX)
 436         fputs_filtered ("(", stream);
 437       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 438           && exp->elts[pc + 3].opcode == OP_LONG)
 439         {
 440           struct value_print_options opts;
 441
 442           /* We have a minimal symbol fn, probably.  It's encoded
 443              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 444              Swallow the OP_LONG (including both its opcodes); ignore
 445              its type; print the value in the type of the MEMVAL.  */
 446           (*pos) += 4;
 447           val = value_at_lazy (exp->elts[pc + 1].type,
 448                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 449           get_raw_print_options (&opts);
 450           value_print (val, stream, &opts);
 451         }
 452       else
 453         {
 454           fputs_filtered ("{", stream);
 455           type_print (exp->elts[pc + 1].type, "", stream, 0);
 456           fputs_filtered ("} ", stream);
 457           print_subexp (exp, pos, stream, PREC_PREFIX);
 458         }
 459       if ((int) prec > (int) PREC_PREFIX)
 460         fputs_filtered (")", stream);
 461       return;
 462
 463     case UNOP_MEMVAL_TYPE:
 464       if ((int) prec > (int) PREC_PREFIX)
 465         fputs_filtered ("(", stream);
 466       fputs_filtered ("{", stream);
 467       print_subexp (exp, pos, stream, PREC_PREFIX);
 468       fputs_filtered ("} ", stream);
 469       print_subexp (exp, pos, stream, PREC_PREFIX);
 470       if ((int) prec > (int) PREC_PREFIX)
 471         fputs_filtered (")", stream);
 472       return;
 473
 474     case UNOP_MEMVAL_TLS:
 475       (*pos) += 3;
 476       if ((int) prec > (int) PREC_PREFIX)
 477         fputs_filtered ("(", stream);
 478       fputs_filtered ("{", stream);
 479       type_print (exp->elts[pc + 2].type, "", stream, 0);
 480       fputs_filtered ("} ", stream);
 481       print_subexp (exp, pos, stream, PREC_PREFIX);
 482       if ((int) prec > (int) PREC_PREFIX)
 483         fputs_filtered (")", stream);
 484       return;
 485
 486     case BINOP_ASSIGN_MODIFY:
 487       opcode = exp->elts[pc + 1].opcode;
 488       (*pos) += 2;
 489       myprec = PREC_ASSIGN;
 490       assoc = 1;
 491       assign_modify = 1;
 492       op_str = "???";
 493       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 494         if (op_print_tab[tem].opcode == opcode)
 495           {
 496             op_str = op_print_tab[tem].string;
 497             break;
 498           }
 499       if (op_print_tab[tem].opcode != opcode)
 500         /* Not found; don't try to keep going because we don't know how
 501            to interpret further elements.  */
 502         error (_("Invalid expression"));
 503       break;
 504
 505       /* C++ ops */
 506
 507     case OP_THIS:
 508       ++(*pos);
 509       if (exp->language_defn->la_name_of_this)
 510         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 511       else
 512         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 513                           exp->language_defn->la_name);
 514       return;
 515
 516       /* Modula-2 ops */
 517
 518     case MULTI_SUBSCRIPT:
 519       (*pos) += 2;
 520       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 521       print_subexp (exp, pos, stream, PREC_SUFFIX);
 522       fprintf_unfiltered (stream, " [");
 523       for (tem = 0; tem < nargs; tem++)
 524         {
 525           if (tem != 0)
 526             fprintf_unfiltered (stream, ", ");
 527           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 528         }
 529       fprintf_unfiltered (stream, "]");
 530       return;
 531
 532     case BINOP_VAL:
 533       (*pos) += 2;
 534       fprintf_unfiltered (stream, "VAL(");
 535       type_print (exp->elts[pc + 1].type, "", stream, 0);
 536       fprintf_unfiltered (stream, ",");
 537       print_subexp (exp, pos, stream, PREC_PREFIX);
 538       fprintf_unfiltered (stream, ")");
 539       return;
 540
 541     case TYPE_INSTANCE:
 542       {
 543         LONGEST count = exp->elts[pc + 1].longconst;
 544
 545         /* The COUNT.  */
 546         (*pos)++;
 547         fputs_unfiltered ("TypesInstance(", stream);
 548         while (count-- > 0)
 549           {
 550             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 551             if (count > 0)
 552               fputs_unfiltered (",", stream);
 553           }
 554         fputs_unfiltered (",", stream);
 555         /* Ending COUNT and ending TYPE_INSTANCE.  */
 556         (*pos) += 2;
 557         print_subexp (exp, pos, stream, PREC_PREFIX);
 558         fputs_unfiltered (")", stream);
 559         return;
 560       }
 561
 562       /* Default ops */
 563
 564     default:
 565       op_str = "???";
 566       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 567         if (op_print_tab[tem].opcode == opcode)
 568           {
 569             op_str = op_print_tab[tem].string;
 570             myprec = op_print_tab[tem].precedence;
 571             assoc = op_print_tab[tem].right_assoc;
 572             break;
 573           }
 574       if (op_print_tab[tem].opcode != opcode)
 575         /* Not found; don't try to keep going because we don't know how
 576            to interpret further elements.  For example, this happens
 577            if opcode is OP_TYPE.  */
 578         error (_("Invalid expression"));
 579     }
 580
 581   /* Note that PREC_BUILTIN will always emit parentheses.  */
 582   if ((int) myprec < (int) prec)
 583     fputs_filtered ("(", stream);
 584   if ((int) opcode > (int) BINOP_END)
 585     {
 586       if (assoc)
 587         {
 588           /* Unary postfix operator.  */
 589           print_subexp (exp, pos, stream, PREC_SUFFIX);
 590           fputs_filtered (op_str, stream);
 591         }
 592       else
 593         {
 594           /* Unary prefix operator.  */
 595           fputs_filtered (op_str, stream);
 596           if (myprec == PREC_BUILTIN_FUNCTION)
 597             fputs_filtered ("(", stream);
 598           print_subexp (exp, pos, stream, PREC_PREFIX);
 599           if (myprec == PREC_BUILTIN_FUNCTION)
 600             fputs_filtered (")", stream);
 601         }
 602     }
 603   else
 604     {
 605       /* Binary operator.  */
 606       /* Print left operand.
 607          If operator is right-associative,
 608          increment precedence for this operand.  */
 609       print_subexp (exp, pos, stream,
 610                     (enum precedence) ((int) myprec + assoc));
 611       /* Print the operator itself.  */
 612       if (assign_modify)
 613         fprintf_filtered (stream, " %s= ", op_str);
 614       else if (op_str[0] == ',')
 615         fprintf_filtered (stream, "%s ", op_str);
 616       else
 617         fprintf_filtered (stream, " %s ", op_str);
 618       /* Print right operand.
 619          If operator is left-associative,
 620          increment precedence for this operand.  */
 621       print_subexp (exp, pos, stream,
 622                     (enum precedence) ((int) myprec + !assoc));
 623     }
 624
 625   if ((int) myprec < (int) prec)
 626     fputs_filtered (")", stream);
 627 }
 628
 629 /* Return the operator corresponding to opcode OP as
 630    a string.   NULL indicates that the opcode was not found in the
 631    current language table.  */
 632 char *
 633 op_string (enum exp_opcode op)
 634 {
 635   int tem;
 636   const struct op_print *op_print_tab;
 637
 638   op_print_tab = current_language->la_op_print_tab;
 639   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 640     if (op_print_tab[tem].opcode == op)
 641       return op_print_tab[tem].string;
 642   return NULL;
 643 }
 644
 645 /* Support for dumping the raw data from expressions in a human readable
 646    form.  */
 647
 648 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 649
 650 /* Name for OPCODE, when it appears in expression EXP.  */
 651
 652 char *
 653 op_name (struct expression *exp, enum exp_opcode opcode)
 654 {
 655   return exp->language_defn->la_exp_desc->op_name (opcode);
 656 }
 657
 658 /* Default name for the standard operator OPCODE (i.e., one defined in
 659    the definition of enum exp_opcode).  */
 660
 661 char *
 662 op_name_standard (enum exp_opcode opcode)
 663 {
 664   switch (opcode)
 665     {
 666     default:
 667       {
 668         static char buf[30];
 669
 670         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 671         return buf;
 672       }
 673 #define OP(name)        \
 674     case name:          \
 675       return #name ;
 676 #include "std-operator.def"
 677 #undef OP
 678     }
 679 }
 680
 681 /* Print a raw dump of expression EXP to STREAM.
 682    NOTE, if non-NULL, is printed as extra explanatory text.  */
 683
 684 void
 685 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 686                      char *note)
 687 {
 688   int elt;
 689   char *opcode_name;
 690   char *eltscan;
 691   int eltsize;
 692
 693   fprintf_filtered (stream, "Dump of expression @ ");
 694   gdb_print_host_address (exp, stream);
 695   if (note)
 696     fprintf_filtered (stream, ", %s:", note);
 697   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 698                     exp->language_defn->la_name, exp->nelts,
 699                     (long) sizeof (union exp_element));
 700   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 701                     "Hex Value", "String Value");
 702   for (elt = 0; elt < exp->nelts; elt++)
 703     {
 704       fprintf_filtered (stream, "\t%5d  ", elt);
 705       opcode_name = op_name (exp, exp->elts[elt].opcode);
 706
 707       fprintf_filtered (stream, "%20s  ", opcode_name);
 708       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 709       fprintf_filtered (stream, "  ");
 710
 711       for (eltscan = (char *) &exp->elts[elt],
 712            eltsize = sizeof (union exp_element);
 713            eltsize-- > 0;
 714            eltscan++)
 715         {
 716           fprintf_filtered (stream, "%c",
 717                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 718         }
 719       fprintf_filtered (stream, "\n");
 720     }
 721 }
 722
 723 /* Dump the subexpression of prefix expression EXP whose operator is at
 724    position ELT onto STREAM.  Returns the position of the next
 725    subexpression in EXP.  */
 726
 727 int
 728 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 729 {
 730   static int indent = 0;
 731   int i;
 732
 733   fprintf_filtered (stream, "\n");
 734   fprintf_filtered (stream, "\t%5d  ", elt);
 735
 736   for (i = 1; i <= indent; i++)
 737     fprintf_filtered (stream, " ");
 738   indent += 2;
 739
 740   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 741
 742   elt = dump_subexp_body (exp, stream, elt);
 743
 744   indent -= 2;
 745
 746   return elt;
 747 }
 748
 749 /* Dump the operands of prefix expression EXP whose opcode is at
 750    position ELT onto STREAM.  Returns the position of the next
 751    subexpression in EXP.  */
 752
 753 static int
 754 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 755 {
 756   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 757 }
 758
 759 /* Default value for subexp_body in exp_descriptor vector.  */
 760
 761 int
 762 dump_subexp_body_standard (struct expression *exp,
 763                            struct ui_file *stream, int elt)
 764 {
 765   int opcode = exp->elts[elt++].opcode;
 766
 767   switch (opcode)
 768     {
 769     case TERNOP_COND:
 770     case TERNOP_SLICE:
 771       elt = dump_subexp (exp, stream, elt);
 772       /* FALL THROUGH */
 773     case BINOP_ADD:
 774     case BINOP_SUB:
 775     case BINOP_MUL:
 776     case BINOP_DIV:
 777     case BINOP_REM:
 778     case BINOP_MOD:
 779     case BINOP_LSH:
 780     case BINOP_RSH:
 781     case BINOP_LOGICAL_AND:
 782     case BINOP_LOGICAL_OR:
 783     case BINOP_BITWISE_AND:
 784     case BINOP_BITWISE_IOR:
 785     case BINOP_BITWISE_XOR:
 786     case BINOP_EQUAL:
 787     case BINOP_NOTEQUAL:
 788     case BINOP_LESS:
 789     case BINOP_GTR:
 790     case BINOP_LEQ:
 791     case BINOP_GEQ:
 792     case BINOP_REPEAT:
 793     case BINOP_ASSIGN:
 794     case BINOP_COMMA:
 795     case BINOP_SUBSCRIPT:
 796     case BINOP_EXP:
 797     case BINOP_MIN:
 798     case BINOP_MAX:
 799     case BINOP_INTDIV:
 800     case BINOP_ASSIGN_MODIFY:
 801     case BINOP_VAL:
 802     case BINOP_CONCAT:
 803     case BINOP_IN:
 804     case BINOP_RANGE:
 805     case BINOP_END:
 806     case STRUCTOP_MEMBER:
 807     case STRUCTOP_MPTR:
 808       elt = dump_subexp (exp, stream, elt);
 809       /* FALL THROUGH */
 810     case UNOP_NEG:
 811     case UNOP_LOGICAL_NOT:
 812     case UNOP_COMPLEMENT:
 813     case UNOP_IND:
 814     case UNOP_ADDR:
 815     case UNOP_PREINCREMENT:
 816     case UNOP_POSTINCREMENT:
 817     case UNOP_PREDECREMENT:
 818     case UNOP_POSTDECREMENT:
 819     case UNOP_SIZEOF:
 820     case UNOP_PLUS:
 821     case UNOP_CAP:
 822     case UNOP_CHR:
 823     case UNOP_ORD:
 824     case UNOP_ABS:
 825     case UNOP_FLOAT:
 826     case UNOP_HIGH:
 827     case UNOP_MAX:
 828     case UNOP_MIN:
 829     case UNOP_ODD:
 830     case UNOP_TRUNC:
 831       elt = dump_subexp (exp, stream, elt);
 832       break;
 833     case OP_LONG:
 834       fprintf_filtered (stream, "Type @");
 835       gdb_print_host_address (exp->elts[elt].type, stream);
 836       fprintf_filtered (stream, " (");
 837       type_print (exp->elts[elt].type, NULL, stream, 0);
 838       fprintf_filtered (stream, "), value %ld (0x%lx)",
 839                         (long) exp->elts[elt + 1].longconst,
 840                         (long) exp->elts[elt + 1].longconst);
 841       elt += 3;
 842       break;
 843     case OP_DOUBLE:
 844       fprintf_filtered (stream, "Type @");
 845       gdb_print_host_address (exp->elts[elt].type, stream);
 846       fprintf_filtered (stream, " (");
 847       type_print (exp->elts[elt].type, NULL, stream, 0);
 848       fprintf_filtered (stream, "), value %g",
 849                         (double) exp->elts[elt + 1].doubleconst);
 850       elt += 3;
 851       break;
 852     case OP_VAR_VALUE:
 853       fprintf_filtered (stream, "Block @");
 854       gdb_print_host_address (exp->elts[elt].block, stream);
 855       fprintf_filtered (stream, ", symbol @");
 856       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 857       fprintf_filtered (stream, " (%s)",
 858                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 859       elt += 3;
 860       break;
 861     case OP_VAR_ENTRY_VALUE:
 862       fprintf_filtered (stream, "Entry value of symbol @");
 863       gdb_print_host_address (exp->elts[elt].symbol, stream);
 864       fprintf_filtered (stream, " (%s)",
 865                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 866       elt += 2;
 867       break;
 868     case OP_LAST:
 869       fprintf_filtered (stream, "History element %ld",
 870                         (long) exp->elts[elt].longconst);
 871       elt += 2;
 872       break;
 873     case OP_REGISTER:
 874       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 875       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 876       break;
 877     case OP_INTERNALVAR:
 878       fprintf_filtered (stream, "Internal var @");
 879       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 880       fprintf_filtered (stream, " (%s)",
 881                         internalvar_name (exp->elts[elt].internalvar));
 882       elt += 2;
 883       break;
 884     case OP_FUNCALL:
 885       {
 886         int i, nargs;
 887
 888         nargs = longest_to_int (exp->elts[elt].longconst);
 889
 890         fprintf_filtered (stream, "Number of args: %d", nargs);
 891         elt += 2;
 892
 893         for (i = 1; i <= nargs + 1; i++)
 894           elt = dump_subexp (exp, stream, elt);
 895       }
 896       break;
 897     case OP_ARRAY:
 898       {
 899         int lower, upper;
 900         int i;
 901
 902         lower = longest_to_int (exp->elts[elt].longconst);
 903         upper = longest_to_int (exp->elts[elt + 1].longconst);
 904
 905         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 906         elt += 3;
 907
 908         for (i = 1; i <= upper - lower + 1; i++)
 909           elt = dump_subexp (exp, stream, elt);
 910       }
 911       break;
 912     case UNOP_DYNAMIC_CAST:
 913     case UNOP_REINTERPRET_CAST:
 914     case UNOP_CAST_TYPE:
 915     case UNOP_MEMVAL_TYPE:
 916       fprintf_filtered (stream, " (");
 917       elt = dump_subexp (exp, stream, elt);
 918       fprintf_filtered (stream, ")");
 919       elt = dump_subexp (exp, stream, elt);
 920       break;
 921     case UNOP_MEMVAL:
 922     case UNOP_CAST:
 923       fprintf_filtered (stream, "Type @");
 924       gdb_print_host_address (exp->elts[elt].type, stream);
 925       fprintf_filtered (stream, " (");
 926       type_print (exp->elts[elt].type, NULL, stream, 0);
 927       fprintf_filtered (stream, ")");
 928       elt = dump_subexp (exp, stream, elt + 2);
 929       break;
 930     case UNOP_MEMVAL_TLS:
 931       fprintf_filtered (stream, "TLS type @");
 932       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 933       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 934                         (exp->elts[elt].objfile == NULL ? "(null)"
 935                          : exp->elts[elt].objfile->name));
 936       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 937       fprintf_filtered (stream, ")");
 938       elt = dump_subexp (exp, stream, elt + 3);
 939       break;
 940     case OP_TYPE:
 941       fprintf_filtered (stream, "Type @");
 942       gdb_print_host_address (exp->elts[elt].type, stream);
 943       fprintf_filtered (stream, " (");
 944       type_print (exp->elts[elt].type, NULL, stream, 0);
 945       fprintf_filtered (stream, ")");
 946       elt += 2;
 947       break;
 948     case OP_TYPEOF:
 949     case OP_DECLTYPE:
 950       fprintf_filtered (stream, "Typeof (");
 951       elt = dump_subexp (exp, stream, elt);
 952       fprintf_filtered (stream, ")");
 953       break;
 954     case STRUCTOP_STRUCT:
 955     case STRUCTOP_PTR:
 956       {
 957         char *elem_name;
 958         int len;
 959
 960         len = longest_to_int (exp->elts[elt].longconst);
 961         elem_name = &exp->elts[elt + 1].string;
 962
 963         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 964         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 965       }
 966       break;
 967     case OP_SCOPE:
 968       {
 969         char *elem_name;
 970         int len;
 971
 972         fprintf_filtered (stream, "Type @");
 973         gdb_print_host_address (exp->elts[elt].type, stream);
 974         fprintf_filtered (stream, " (");
 975         type_print (exp->elts[elt].type, NULL, stream, 0);
 976         fprintf_filtered (stream, ") ");
 977
 978         len = longest_to_int (exp->elts[elt + 1].longconst);
 979         elem_name = &exp->elts[elt + 2].string;
 980
 981         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
 982         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
 983       }
 984       break;
 985     case TYPE_INSTANCE:
 986       {
 987         LONGEST len;
 988
 989         len = exp->elts[elt++].longconst;
 990         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
 991         while (len-- > 0)
 992           {
 993             fprintf_filtered (stream, "Type @");
 994             gdb_print_host_address (exp->elts[elt].type, stream);
 995             fprintf_filtered (stream, " (");
 996             type_print (exp->elts[elt].type, NULL, stream, 0);
 997             fprintf_filtered (stream, ")");
 998             elt++;
 999             if (len > 0)
1000               fputs_filtered (", ", stream);
1001           }
1002         /* Ending LEN and ending TYPE_INSTANCE.  */
1003         elt += 2;
1004         elt = dump_subexp (exp, stream, elt);
1005       }
1006       break;
1007     default:
1008     case OP_NULL:
1009     case MULTI_SUBSCRIPT:
1010     case OP_F77_UNDETERMINED_ARGLIST:
1011     case OP_COMPLEX:
1012     case OP_STRING:
1013     case OP_BOOL:
1014     case OP_M2_STRING:
1015     case OP_THIS:
1016     case OP_NAME:
1017       fprintf_filtered (stream, "Unknown format");
1018     }
1019
1020   return elt;
1021 }
1022
1023 void
1024 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1025 {
1026   int elt;
1027
1028   fprintf_filtered (stream, "Dump of expression @ ");
1029   gdb_print_host_address (exp, stream);
1030   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1031   print_expression (exp, stream);
1032   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1033                     exp->language_defn->la_name, exp->nelts,
1034                     (long) sizeof (union exp_element));
1035   fputs_filtered ("\n", stream);
1036
1037   for (elt = 0; elt < exp->nelts;)
1038     elt = dump_subexp (exp, stream, elt);
1039   fputs_filtered ("\n", stream);
1040 }