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