gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986, 1988-1989, 1991-2000, 2003, 2007-2012 Free
   4    Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "symtab.h"
  23 #include "gdbtypes.h"
  24 #include "expression.h"
  25 #include "value.h"
  26 #include "language.h"
  27 #include "parser-defs.h"
  28 #include "user-regs.h"          /* For user_reg_map_regnum_to_name.  */
  29 #include "target.h"
  30 #include "gdb_string.h"
  31 #include "block.h"
  32 #include "objfiles.h"
  33 #include "gdb_assert.h"
  34 #include "valprint.h"
  35
  36 #ifdef HAVE_CTYPE_H
  37 #include <ctype.h>
  38 #endif
  39
  40 void
  41 print_expression (struct expression *exp, struct ui_file *stream)
  42 {
  43   int pc = 0;
  44
  45   print_subexp (exp, &pc, stream, PREC_NULL);
  46 }
  47
  48 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  49    PREC is the precedence of the surrounding operator;
  50    if the precedence of the main operator of this subexpression is less,
  51    parentheses are needed here.  */
  52
  53 void
  54 print_subexp (struct expression *exp, int *pos,
  55               struct ui_file *stream, enum precedence prec)
  56 {
  57   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  58 }
  59
  60 /* Standard implementation of print_subexp for use in language_defn
  61    vectors.  */
  62 void
  63 print_subexp_standard (struct expression *exp, int *pos,
  64                        struct ui_file *stream, enum precedence prec)
  65 {
  66   unsigned tem;
  67   const struct op_print *op_print_tab;
  68   int pc;
  69   unsigned nargs;
  70   char *op_str;
  71   int assign_modify = 0;
  72   enum exp_opcode opcode;
  73   enum precedence myprec = PREC_NULL;
  74   /* Set to 1 for a right-associative operator.  */
  75   int assoc = 0;
  76   struct value *val;
  77   char *tempstr = NULL;
  78
  79   op_print_tab = exp->language_defn->la_op_print_tab;
  80   pc = (*pos)++;
  81   opcode = exp->elts[pc].opcode;
  82   switch (opcode)
  83     {
  84       /* Common ops */
  85
  86     case OP_SCOPE:
  87       myprec = PREC_PREFIX;
  88       assoc = 0;
  89       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  90       fputs_filtered ("::", stream);
  91       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  92       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  93       fputs_filtered (&exp->elts[pc + 3].string, stream);
  94       return;
  95
  96     case OP_LONG:
  97       {
  98         struct value_print_options opts;
  99
 100         get_raw_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_DOUBLE:
 109       {
 110         struct value_print_options opts;
 111
 112         get_raw_print_options (&opts);
 113         (*pos) += 3;
 114         value_print (value_from_double (exp->elts[pc + 1].type,
 115                                         exp->elts[pc + 2].doubleconst),
 116                      stream, &opts);
 117       }
 118       return;
 119
 120     case OP_VAR_VALUE:
 121       {
 122         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_ENTRY_VALUE:
 138       {
 139         (*pos) += 2;
 140         fprintf_filtered (stream, "%s@entry",
 141                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 142       }
 143       return;
 144
 145     case OP_LAST:
 146       (*pos) += 2;
 147       fprintf_filtered (stream, "$%d",
 148                         longest_to_int (exp->elts[pc + 1].longconst));
 149       return;
 150
 151     case OP_REGISTER:
 152       {
 153         const char *name = &exp->elts[pc + 2].string;
 154
 155         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 156         fprintf_filtered (stream, "$%s", name);
 157         return;
 158       }
 159
 160     case OP_BOOL:
 161       (*pos) += 2;
 162       fprintf_filtered (stream, "%s",
 163                         longest_to_int (exp->elts[pc + 1].longconst)
 164                         ? "TRUE" : "FALSE");
 165       return;
 166
 167     case OP_INTERNALVAR:
 168       (*pos) += 2;
 169       fprintf_filtered (stream, "$%s",
 170                         internalvar_name (exp->elts[pc + 1].internalvar));
 171       return;
 172
 173     case OP_FUNCALL:
 174       (*pos) += 2;
 175       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 176       print_subexp (exp, pos, stream, PREC_SUFFIX);
 177       fputs_filtered (" (", stream);
 178       for (tem = 0; tem < nargs; tem++)
 179         {
 180           if (tem != 0)
 181             fputs_filtered (", ", stream);
 182           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 183         }
 184       fputs_filtered (")", stream);
 185       return;
 186
 187     case OP_NAME:
 188       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 189       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 190       fputs_filtered (&exp->elts[pc + 2].string, stream);
 191       return;
 192
 193     case OP_STRING:
 194       {
 195         struct value_print_options opts;
 196
 197         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 198         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 199         /* LA_PRINT_STRING will print using the current repeat count threshold.
 200            If necessary, we can temporarily set it to zero, or pass it as an
 201            additional parameter to LA_PRINT_STRING.  -fnf */
 202         get_user_print_options (&opts);
 203         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 204                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 205       }
 206       return;
 207
 208     case OP_BITSTRING:
 209       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 210       (*pos)
 211         += 3 + BYTES_TO_EXP_ELEM ((nargs + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
 212       fprintf_unfiltered (stream, "B'<unimplemented>'");
 213       return;
 214
 215     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 216                                    NSString constant.  */
 217       {
 218         struct value_print_options opts;
 219
 220         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 221         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 222         fputs_filtered ("@\"", stream);
 223         get_user_print_options (&opts);
 224         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 225                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 226         fputs_filtered ("\"", stream);
 227       }
 228       return;
 229
 230     case OP_OBJC_MSGCALL:
 231       {                 /* Objective C message (method) call.  */
 232         char *selector;
 233
 234         (*pos) += 3;
 235         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 236         fprintf_unfiltered (stream, "[");
 237         print_subexp (exp, pos, stream, PREC_SUFFIX);
 238         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 239                                      &selector, 1024, NULL))
 240           {
 241             error (_("bad selector"));
 242             return;
 243           }
 244         if (nargs)
 245           {
 246             char *s, *nextS;
 247
 248             s = alloca (strlen (selector) + 1);
 249             strcpy (s, selector);
 250             for (tem = 0; tem < nargs; tem++)
 251               {
 252                 nextS = strchr (s, ':');
 253                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 254                 *nextS = '\0';
 255                 fprintf_unfiltered (stream, " %s: ", s);
 256                 s = nextS + 1;
 257                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 258               }
 259           }
 260         else
 261           {
 262             fprintf_unfiltered (stream, " %s", selector);
 263           }
 264         fprintf_unfiltered (stream, "]");
 265         /* "selector" was malloc'd by target_read_string.  Free it.  */
 266         xfree (selector);
 267         return;
 268       }
 269
 270     case OP_ARRAY:
 271       (*pos) += 3;
 272       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 273       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 274       nargs++;
 275       tem = 0;
 276       if (exp->elts[pc + 4].opcode == OP_LONG
 277           && exp->elts[pc + 5].type
 278              == builtin_type (exp->gdbarch)->builtin_char
 279           && exp->language_defn->la_language == language_c)
 280         {
 281           /* Attempt to print C character arrays using string syntax.
 282              Walk through the args, picking up one character from each
 283              of the OP_LONG expression elements.  If any array element
 284              does not match our expection of what we should find for
 285              a simple string, revert back to array printing.  Note that
 286              the last expression element is an explicit null terminator
 287              byte, which doesn't get printed.  */
 288           tempstr = alloca (nargs);
 289           pc += 4;
 290           while (tem < nargs)
 291             {
 292               if (exp->elts[pc].opcode != OP_LONG
 293                   || exp->elts[pc + 1].type
 294                      != builtin_type (exp->gdbarch)->builtin_char)
 295                 {
 296                   /* Not a simple array of char, use regular array
 297                      printing.  */
 298                   tem = 0;
 299                   break;
 300                 }
 301               else
 302                 {
 303                   tempstr[tem++] =
 304                     longest_to_int (exp->elts[pc + 2].longconst);
 305                   pc += 4;
 306                 }
 307             }
 308         }
 309       if (tem > 0)
 310         {
 311           struct value_print_options opts;
 312
 313           get_user_print_options (&opts);
 314           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 315                            tempstr, nargs - 1, NULL, 0, &opts);
 316           (*pos) = pc;
 317         }
 318       else
 319         {
 320           fputs_filtered (" {", stream);
 321           for (tem = 0; tem < nargs; tem++)
 322             {
 323               if (tem != 0)
 324                 {
 325                   fputs_filtered (", ", stream);
 326                 }
 327               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 328             }
 329           fputs_filtered ("}", stream);
 330         }
 331       return;
 332
 333     case OP_LABELED:
 334       tem = longest_to_int (exp->elts[pc + 1].longconst);
 335       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 336       /* Gcc support both these syntaxes.  Unsure which is preferred.  */
 337 #if 1
 338       fputs_filtered (&exp->elts[pc + 2].string, stream);
 339       fputs_filtered (": ", stream);
 340 #else
 341       fputs_filtered (".", stream);
 342       fputs_filtered (&exp->elts[pc + 2].string, stream);
 343       fputs_filtered ("=", stream);
 344 #endif
 345       print_subexp (exp, pos, stream, PREC_SUFFIX);
 346       return;
 347
 348     case TERNOP_COND:
 349       if ((int) prec > (int) PREC_COMMA)
 350         fputs_filtered ("(", stream);
 351       /* Print the subexpressions, forcing parentheses
 352          around any binary operations within them.
 353          This is more parentheses than are strictly necessary,
 354          but it looks clearer.  */
 355       print_subexp (exp, pos, stream, PREC_HYPER);
 356       fputs_filtered (" ? ", stream);
 357       print_subexp (exp, pos, stream, PREC_HYPER);
 358       fputs_filtered (" : ", stream);
 359       print_subexp (exp, pos, stream, PREC_HYPER);
 360       if ((int) prec > (int) PREC_COMMA)
 361         fputs_filtered (")", stream);
 362       return;
 363
 364     case TERNOP_SLICE:
 365     case TERNOP_SLICE_COUNT:
 366       print_subexp (exp, pos, stream, PREC_SUFFIX);
 367       fputs_filtered ("(", stream);
 368       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 369       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 370       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 371       fputs_filtered (")", stream);
 372       return;
 373
 374     case STRUCTOP_STRUCT:
 375       tem = longest_to_int (exp->elts[pc + 1].longconst);
 376       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 377       print_subexp (exp, pos, stream, PREC_SUFFIX);
 378       fputs_filtered (".", stream);
 379       fputs_filtered (&exp->elts[pc + 2].string, stream);
 380       return;
 381
 382       /* Will not occur for Modula-2.  */
 383     case STRUCTOP_PTR:
 384       tem = longest_to_int (exp->elts[pc + 1].longconst);
 385       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 386       print_subexp (exp, pos, stream, PREC_SUFFIX);
 387       fputs_filtered ("->", stream);
 388       fputs_filtered (&exp->elts[pc + 2].string, stream);
 389       return;
 390
 391     case STRUCTOP_MEMBER:
 392       print_subexp (exp, pos, stream, PREC_SUFFIX);
 393       fputs_filtered (".*", stream);
 394       print_subexp (exp, pos, stream, PREC_SUFFIX);
 395       return;
 396
 397     case STRUCTOP_MPTR:
 398       print_subexp (exp, pos, stream, PREC_SUFFIX);
 399       fputs_filtered ("->*", stream);
 400       print_subexp (exp, pos, stream, PREC_SUFFIX);
 401       return;
 402
 403     case BINOP_SUBSCRIPT:
 404       print_subexp (exp, pos, stream, PREC_SUFFIX);
 405       fputs_filtered ("[", stream);
 406       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 407       fputs_filtered ("]", stream);
 408       return;
 409
 410     case UNOP_POSTINCREMENT:
 411       print_subexp (exp, pos, stream, PREC_SUFFIX);
 412       fputs_filtered ("++", stream);
 413       return;
 414
 415     case UNOP_POSTDECREMENT:
 416       print_subexp (exp, pos, stream, PREC_SUFFIX);
 417       fputs_filtered ("--", stream);
 418       return;
 419
 420     case UNOP_CAST:
 421       (*pos) += 2;
 422       if ((int) prec > (int) PREC_PREFIX)
 423         fputs_filtered ("(", stream);
 424       fputs_filtered ("(", stream);
 425       type_print (exp->elts[pc + 1].type, "", stream, 0);
 426       fputs_filtered (") ", stream);
 427       print_subexp (exp, pos, stream, PREC_PREFIX);
 428       if ((int) prec > (int) PREC_PREFIX)
 429         fputs_filtered (")", stream);
 430       return;
 431
 432     case UNOP_CAST_TYPE:
 433       (*pos) += 1;
 434       if ((int) prec > (int) PREC_PREFIX)
 435         fputs_filtered ("(", stream);
 436       fputs_filtered ("(", stream);
 437       print_subexp (exp, pos, stream, PREC_PREFIX);
 438       fputs_filtered (") ", stream);
 439       print_subexp (exp, pos, stream, PREC_PREFIX);
 440       if ((int) prec > (int) PREC_PREFIX)
 441         fputs_filtered (")", stream);
 442       return;
 443
 444     case UNOP_DYNAMIC_CAST:
 445     case UNOP_REINTERPRET_CAST:
 446       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 447                       : "reinterpret_cast", stream);
 448       fputs_filtered ("<", stream);
 449       (*pos) += 1;
 450       print_subexp (exp, pos, stream, PREC_PREFIX);
 451       fputs_filtered ("> (", stream);
 452       print_subexp (exp, pos, stream, PREC_PREFIX);
 453       fputs_filtered (")", stream);
 454       return;
 455
 456     case UNOP_MEMVAL:
 457       (*pos) += 2;
 458       if ((int) prec > (int) PREC_PREFIX)
 459         fputs_filtered ("(", stream);
 460       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 461           && exp->elts[pc + 3].opcode == OP_LONG)
 462         {
 463           struct value_print_options opts;
 464
 465           /* We have a minimal symbol fn, probably.  It's encoded
 466              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 467              Swallow the OP_LONG (including both its opcodes); ignore
 468              its type; print the value in the type of the MEMVAL.  */
 469           (*pos) += 4;
 470           val = value_at_lazy (exp->elts[pc + 1].type,
 471                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 472           get_raw_print_options (&opts);
 473           value_print (val, stream, &opts);
 474         }
 475       else
 476         {
 477           fputs_filtered ("{", stream);
 478           type_print (exp->elts[pc + 1].type, "", stream, 0);
 479           fputs_filtered ("} ", stream);
 480           print_subexp (exp, pos, stream, PREC_PREFIX);
 481         }
 482       if ((int) prec > (int) PREC_PREFIX)
 483         fputs_filtered (")", stream);
 484       return;
 485
 486     case UNOP_MEMVAL_TYPE:
 487       (*pos) += 1;
 488       if ((int) prec > (int) PREC_PREFIX)
 489         fputs_filtered ("(", stream);
 490       fputs_filtered ("{", stream);
 491       print_subexp (exp, pos, stream, PREC_PREFIX);
 492       fputs_filtered ("} ", stream);
 493       print_subexp (exp, pos, stream, PREC_PREFIX);
 494       if ((int) prec > (int) PREC_PREFIX)
 495         fputs_filtered (")", stream);
 496       return;
 497
 498     case UNOP_MEMVAL_TLS:
 499       (*pos) += 3;
 500       if ((int) prec > (int) PREC_PREFIX)
 501         fputs_filtered ("(", stream);
 502       fputs_filtered ("{", stream);
 503       type_print (exp->elts[pc + 2].type, "", stream, 0);
 504       fputs_filtered ("} ", stream);
 505       print_subexp (exp, pos, stream, PREC_PREFIX);
 506       if ((int) prec > (int) PREC_PREFIX)
 507         fputs_filtered (")", stream);
 508       return;
 509
 510     case BINOP_ASSIGN_MODIFY:
 511       opcode = exp->elts[pc + 1].opcode;
 512       (*pos) += 2;
 513       myprec = PREC_ASSIGN;
 514       assoc = 1;
 515       assign_modify = 1;
 516       op_str = "???";
 517       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 518         if (op_print_tab[tem].opcode == opcode)
 519           {
 520             op_str = op_print_tab[tem].string;
 521             break;
 522           }
 523       if (op_print_tab[tem].opcode != opcode)
 524         /* Not found; don't try to keep going because we don't know how
 525            to interpret further elements.  */
 526         error (_("Invalid expression"));
 527       break;
 528
 529       /* C++ ops */
 530
 531     case OP_THIS:
 532       ++(*pos);
 533       if (exp->language_defn->la_name_of_this)
 534         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 535       else
 536         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 537                           exp->language_defn->la_name);
 538       return;
 539
 540       /* Modula-2 ops */
 541
 542     case MULTI_SUBSCRIPT:
 543       (*pos) += 2;
 544       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 545       print_subexp (exp, pos, stream, PREC_SUFFIX);
 546       fprintf_unfiltered (stream, " [");
 547       for (tem = 0; tem < nargs; tem++)
 548         {
 549           if (tem != 0)
 550             fprintf_unfiltered (stream, ", ");
 551           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 552         }
 553       fprintf_unfiltered (stream, "]");
 554       return;
 555
 556     case BINOP_VAL:
 557       (*pos) += 2;
 558       fprintf_unfiltered (stream, "VAL(");
 559       type_print (exp->elts[pc + 1].type, "", stream, 0);
 560       fprintf_unfiltered (stream, ",");
 561       print_subexp (exp, pos, stream, PREC_PREFIX);
 562       fprintf_unfiltered (stream, ")");
 563       return;
 564
 565     case TYPE_INSTANCE:
 566       {
 567         LONGEST count = exp->elts[pc + 1].longconst;
 568
 569         /* The COUNT.  */
 570         (*pos)++;
 571         fputs_unfiltered ("TypesInstance(", stream);
 572         while (count-- > 0)
 573           {
 574             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 575             if (count > 0)
 576               fputs_unfiltered (",", stream);
 577           }
 578         fputs_unfiltered (",", stream);
 579         /* Ending COUNT and ending TYPE_INSTANCE.  */
 580         (*pos) += 2;
 581         print_subexp (exp, pos, stream, PREC_PREFIX);
 582         fputs_unfiltered (")", stream);
 583         return;
 584       }
 585
 586       /* Default ops */
 587
 588     default:
 589       op_str = "???";
 590       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 591         if (op_print_tab[tem].opcode == opcode)
 592           {
 593             op_str = op_print_tab[tem].string;
 594             myprec = op_print_tab[tem].precedence;
 595             assoc = op_print_tab[tem].right_assoc;
 596             break;
 597           }
 598       if (op_print_tab[tem].opcode != opcode)
 599         /* Not found; don't try to keep going because we don't know how
 600            to interpret further elements.  For example, this happens
 601            if opcode is OP_TYPE.  */
 602         error (_("Invalid expression"));
 603     }
 604
 605   /* Note that PREC_BUILTIN will always emit parentheses.  */
 606   if ((int) myprec < (int) prec)
 607     fputs_filtered ("(", stream);
 608   if ((int) opcode > (int) BINOP_END)
 609     {
 610       if (assoc)
 611         {
 612           /* Unary postfix operator.  */
 613           print_subexp (exp, pos, stream, PREC_SUFFIX);
 614           fputs_filtered (op_str, stream);
 615         }
 616       else
 617         {
 618           /* Unary prefix operator.  */
 619           fputs_filtered (op_str, stream);
 620           if (myprec == PREC_BUILTIN_FUNCTION)
 621             fputs_filtered ("(", stream);
 622           print_subexp (exp, pos, stream, PREC_PREFIX);
 623           if (myprec == PREC_BUILTIN_FUNCTION)
 624             fputs_filtered (")", stream);
 625         }
 626     }
 627   else
 628     {
 629       /* Binary operator.  */
 630       /* Print left operand.
 631          If operator is right-associative,
 632          increment precedence for this operand.  */
 633       print_subexp (exp, pos, stream,
 634                     (enum precedence) ((int) myprec + assoc));
 635       /* Print the operator itself.  */
 636       if (assign_modify)
 637         fprintf_filtered (stream, " %s= ", op_str);
 638       else if (op_str[0] == ',')
 639         fprintf_filtered (stream, "%s ", op_str);
 640       else
 641         fprintf_filtered (stream, " %s ", op_str);
 642       /* Print right operand.
 643          If operator is left-associative,
 644          increment precedence for this operand.  */
 645       print_subexp (exp, pos, stream,
 646                     (enum precedence) ((int) myprec + !assoc));
 647     }
 648
 649   if ((int) myprec < (int) prec)
 650     fputs_filtered (")", stream);
 651 }
 652
 653 /* Return the operator corresponding to opcode OP as
 654    a string.   NULL indicates that the opcode was not found in the
 655    current language table.  */
 656 char *
 657 op_string (enum exp_opcode op)
 658 {
 659   int tem;
 660   const struct op_print *op_print_tab;
 661
 662   op_print_tab = current_language->la_op_print_tab;
 663   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 664     if (op_print_tab[tem].opcode == op)
 665       return op_print_tab[tem].string;
 666   return NULL;
 667 }
 668
 669 /* Support for dumping the raw data from expressions in a human readable
 670    form.  */
 671
 672 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 673
 674 /* Name for OPCODE, when it appears in expression EXP.  */
 675
 676 char *
 677 op_name (struct expression *exp, enum exp_opcode opcode)
 678 {
 679   return exp->language_defn->la_exp_desc->op_name (opcode);
 680 }
 681
 682 /* Default name for the standard operator OPCODE (i.e., one defined in
 683    the definition of enum exp_opcode).  */
 684
 685 char *
 686 op_name_standard (enum exp_opcode opcode)
 687 {
 688   switch (opcode)
 689     {
 690     default:
 691       {
 692         static char buf[30];
 693
 694         sprintf (buf, "<unknown %d>", opcode);
 695         return buf;
 696       }
 697 #define OP(name)        \
 698     case name:          \
 699       return #name ;
 700 #include "std-operator.def"
 701 #undef OP
 702     }
 703 }
 704
 705 /* Print a raw dump of expression EXP to STREAM.
 706    NOTE, if non-NULL, is printed as extra explanatory text.  */
 707
 708 void
 709 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 710                      char *note)
 711 {
 712   int elt;
 713   char *opcode_name;
 714   char *eltscan;
 715   int eltsize;
 716
 717   fprintf_filtered (stream, "Dump of expression @ ");
 718   gdb_print_host_address (exp, stream);
 719   if (note)
 720     fprintf_filtered (stream, ", %s:", note);
 721   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 722                     exp->language_defn->la_name, exp->nelts,
 723                     (long) sizeof (union exp_element));
 724   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 725                     "Hex Value", "String Value");
 726   for (elt = 0; elt < exp->nelts; elt++)
 727     {
 728       fprintf_filtered (stream, "\t%5d  ", elt);
 729       opcode_name = op_name (exp, exp->elts[elt].opcode);
 730
 731       fprintf_filtered (stream, "%20s  ", opcode_name);
 732       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 733       fprintf_filtered (stream, "  ");
 734
 735       for (eltscan = (char *) &exp->elts[elt],
 736            eltsize = sizeof (union exp_element);
 737            eltsize-- > 0;
 738            eltscan++)
 739         {
 740           fprintf_filtered (stream, "%c",
 741                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 742         }
 743       fprintf_filtered (stream, "\n");
 744     }
 745 }
 746
 747 /* Dump the subexpression of prefix expression EXP whose operator is at
 748    position ELT onto STREAM.  Returns the position of the next
 749    subexpression in EXP.  */
 750
 751 int
 752 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 753 {
 754   static int indent = 0;
 755   int i;
 756
 757   fprintf_filtered (stream, "\n");
 758   fprintf_filtered (stream, "\t%5d  ", elt);
 759
 760   for (i = 1; i <= indent; i++)
 761     fprintf_filtered (stream, " ");
 762   indent += 2;
 763
 764   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 765
 766   elt = dump_subexp_body (exp, stream, elt);
 767
 768   indent -= 2;
 769
 770   return elt;
 771 }
 772
 773 /* Dump the operands of prefix expression EXP whose opcode is at
 774    position ELT onto STREAM.  Returns the position of the next
 775    subexpression in EXP.  */
 776
 777 static int
 778 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 779 {
 780   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 781 }
 782
 783 /* Default value for subexp_body in exp_descriptor vector.  */
 784
 785 int
 786 dump_subexp_body_standard (struct expression *exp,
 787                            struct ui_file *stream, int elt)
 788 {
 789   int opcode = exp->elts[elt++].opcode;
 790
 791   switch (opcode)
 792     {
 793     case TERNOP_COND:
 794     case TERNOP_SLICE:
 795     case TERNOP_SLICE_COUNT:
 796       elt = dump_subexp (exp, stream, elt);
 797       /* FALL THROUGH */
 798     case BINOP_ADD:
 799     case BINOP_SUB:
 800     case BINOP_MUL:
 801     case BINOP_DIV:
 802     case BINOP_REM:
 803     case BINOP_MOD:
 804     case BINOP_LSH:
 805     case BINOP_RSH:
 806     case BINOP_LOGICAL_AND:
 807     case BINOP_LOGICAL_OR:
 808     case BINOP_BITWISE_AND:
 809     case BINOP_BITWISE_IOR:
 810     case BINOP_BITWISE_XOR:
 811     case BINOP_EQUAL:
 812     case BINOP_NOTEQUAL:
 813     case BINOP_LESS:
 814     case BINOP_GTR:
 815     case BINOP_LEQ:
 816     case BINOP_GEQ:
 817     case BINOP_REPEAT:
 818     case BINOP_ASSIGN:
 819     case BINOP_COMMA:
 820     case BINOP_SUBSCRIPT:
 821     case BINOP_EXP:
 822     case BINOP_MIN:
 823     case BINOP_MAX:
 824     case BINOP_INTDIV:
 825     case BINOP_ASSIGN_MODIFY:
 826     case BINOP_VAL:
 827     case BINOP_CONCAT:
 828     case BINOP_IN:
 829     case BINOP_RANGE:
 830     case BINOP_END:
 831     case STRUCTOP_MEMBER:
 832     case STRUCTOP_MPTR:
 833       elt = dump_subexp (exp, stream, elt);
 834       /* FALL THROUGH */
 835     case UNOP_NEG:
 836     case UNOP_LOGICAL_NOT:
 837     case UNOP_COMPLEMENT:
 838     case UNOP_IND:
 839     case UNOP_ADDR:
 840     case UNOP_PREINCREMENT:
 841     case UNOP_POSTINCREMENT:
 842     case UNOP_PREDECREMENT:
 843     case UNOP_POSTDECREMENT:
 844     case UNOP_SIZEOF:
 845     case UNOP_PLUS:
 846     case UNOP_CAP:
 847     case UNOP_CHR:
 848     case UNOP_ORD:
 849     case UNOP_ABS:
 850     case UNOP_FLOAT:
 851     case UNOP_HIGH:
 852     case UNOP_MAX:
 853     case UNOP_MIN:
 854     case UNOP_ODD:
 855     case UNOP_TRUNC:
 856       elt = dump_subexp (exp, stream, elt);
 857       break;
 858     case OP_LONG:
 859       fprintf_filtered (stream, "Type @");
 860       gdb_print_host_address (exp->elts[elt].type, stream);
 861       fprintf_filtered (stream, " (");
 862       type_print (exp->elts[elt].type, NULL, stream, 0);
 863       fprintf_filtered (stream, "), value %ld (0x%lx)",
 864                         (long) exp->elts[elt + 1].longconst,
 865                         (long) exp->elts[elt + 1].longconst);
 866       elt += 3;
 867       break;
 868     case OP_DOUBLE:
 869       fprintf_filtered (stream, "Type @");
 870       gdb_print_host_address (exp->elts[elt].type, stream);
 871       fprintf_filtered (stream, " (");
 872       type_print (exp->elts[elt].type, NULL, stream, 0);
 873       fprintf_filtered (stream, "), value %g",
 874                         (double) exp->elts[elt + 1].doubleconst);
 875       elt += 3;
 876       break;
 877     case OP_VAR_VALUE:
 878       fprintf_filtered (stream, "Block @");
 879       gdb_print_host_address (exp->elts[elt].block, stream);
 880       fprintf_filtered (stream, ", symbol @");
 881       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 882       fprintf_filtered (stream, " (%s)",
 883                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 884       elt += 3;
 885       break;
 886     case OP_VAR_ENTRY_VALUE:
 887       fprintf_filtered (stream, "Entry value of symbol @");
 888       gdb_print_host_address (exp->elts[elt].symbol, stream);
 889       fprintf_filtered (stream, " (%s)",
 890                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 891       elt += 2;
 892       break;
 893     case OP_LAST:
 894       fprintf_filtered (stream, "History element %ld",
 895                         (long) exp->elts[elt].longconst);
 896       elt += 2;
 897       break;
 898     case OP_REGISTER:
 899       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 900       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 901       break;
 902     case OP_INTERNALVAR:
 903       fprintf_filtered (stream, "Internal var @");
 904       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 905       fprintf_filtered (stream, " (%s)",
 906                         internalvar_name (exp->elts[elt].internalvar));
 907       elt += 2;
 908       break;
 909     case OP_FUNCALL:
 910       {
 911         int i, nargs;
 912
 913         nargs = longest_to_int (exp->elts[elt].longconst);
 914
 915         fprintf_filtered (stream, "Number of args: %d", nargs);
 916         elt += 2;
 917
 918         for (i = 1; i <= nargs + 1; i++)
 919           elt = dump_subexp (exp, stream, elt);
 920       }
 921       break;
 922     case OP_ARRAY:
 923       {
 924         int lower, upper;
 925         int i;
 926
 927         lower = longest_to_int (exp->elts[elt].longconst);
 928         upper = longest_to_int (exp->elts[elt + 1].longconst);
 929
 930         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 931         elt += 3;
 932
 933         for (i = 1; i <= upper - lower + 1; i++)
 934           elt = dump_subexp (exp, stream, elt);
 935       }
 936       break;
 937     case UNOP_DYNAMIC_CAST:
 938     case UNOP_REINTERPRET_CAST:
 939     case UNOP_CAST_TYPE:
 940     case UNOP_MEMVAL_TYPE:
 941       ++elt;
 942       fprintf_filtered (stream, " (");
 943       elt = dump_subexp (exp, stream, elt);
 944       fprintf_filtered (stream, ")");
 945       elt = dump_subexp (exp, stream, elt);
 946       break;
 947     case UNOP_MEMVAL:
 948     case UNOP_CAST:
 949       fprintf_filtered (stream, "Type @");
 950       gdb_print_host_address (exp->elts[elt].type, stream);
 951       fprintf_filtered (stream, " (");
 952       type_print (exp->elts[elt].type, NULL, stream, 0);
 953       fprintf_filtered (stream, ")");
 954       elt = dump_subexp (exp, stream, elt + 2);
 955       break;
 956     case UNOP_MEMVAL_TLS:
 957       fprintf_filtered (stream, "TLS type @");
 958       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 959       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 960                         (exp->elts[elt].objfile == NULL ? "(null)"
 961                          : exp->elts[elt].objfile->name));
 962       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 963       fprintf_filtered (stream, ")");
 964       elt = dump_subexp (exp, stream, elt + 3);
 965       break;
 966     case OP_TYPE:
 967       fprintf_filtered (stream, "Type @");
 968       gdb_print_host_address (exp->elts[elt].type, stream);
 969       fprintf_filtered (stream, " (");
 970       type_print (exp->elts[elt].type, NULL, stream, 0);
 971       fprintf_filtered (stream, ")");
 972       elt += 2;
 973       break;
 974     case OP_TYPEOF:
 975     case OP_DECLTYPE:
 976       fprintf_filtered (stream, "Typeof (");
 977       elt = dump_subexp (exp, stream, elt);
 978       fprintf_filtered (stream, ")");
 979       break;
 980     case STRUCTOP_STRUCT:
 981     case STRUCTOP_PTR:
 982       {
 983         char *elem_name;
 984         int len;
 985
 986         len = longest_to_int (exp->elts[elt].longconst);
 987         elem_name = &exp->elts[elt + 1].string;
 988
 989         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 990         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 991       }
 992       break;
 993     case OP_SCOPE:
 994       {
 995         char *elem_name;
 996         int len;
 997
 998         fprintf_filtered (stream, "Type @");
 999         gdb_print_host_address (exp->elts[elt].type, stream);
1000         fprintf_filtered (stream, " (");
1001         type_print (exp->elts[elt].type, NULL, stream, 0);
1002         fprintf_filtered (stream, ") ");
1003
1004         len = longest_to_int (exp->elts[elt + 1].longconst);
1005         elem_name = &exp->elts[elt + 2].string;
1006
1007         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1008         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1009       }
1010       break;
1011     case TYPE_INSTANCE:
1012       {
1013         LONGEST len;
1014
1015         len = exp->elts[elt++].longconst;
1016         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
1017         while (len-- > 0)
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             elt++;
1025             if (len > 0)
1026               fputs_filtered (", ", stream);
1027           }
1028         /* Ending LEN and ending TYPE_INSTANCE.  */
1029         elt += 2;
1030         elt = dump_subexp (exp, stream, elt);
1031       }
1032       break;
1033     default:
1034     case OP_NULL:
1035     case MULTI_SUBSCRIPT:
1036     case OP_F77_UNDETERMINED_ARGLIST:
1037     case OP_COMPLEX:
1038     case OP_STRING:
1039     case OP_BITSTRING:
1040     case OP_BOOL:
1041     case OP_M2_STRING:
1042     case OP_THIS:
1043     case OP_LABELED:
1044     case OP_NAME:
1045       fprintf_filtered (stream, "Unknown format");
1046     }
1047
1048   return elt;
1049 }
1050
1051 void
1052 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1053 {
1054   int elt;
1055
1056   fprintf_filtered (stream, "Dump of expression @ ");
1057   gdb_print_host_address (exp, stream);
1058   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1059   if (exp->elts[0].opcode != OP_TYPE)
1060     print_expression (exp, stream);
1061   else
1062     fputs_filtered ("Type printing not yet supported....", stream);
1063   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1064                     exp->language_defn->la_name, exp->nelts,
1065                     (long) sizeof (union exp_element));
1066   fputs_filtered ("\n", stream);
1067
1068   for (elt = 0; elt < exp->nelts;)
1069     elt = dump_subexp (exp, stream, elt);
1070   fputs_filtered ("\n", stream);
1071 }