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 TERNOP_COND:
 332       if ((int) prec > (int) PREC_COMMA)
 333         fputs_filtered ("(", stream);
 334       /* Print the subexpressions, forcing parentheses
 335          around any binary operations within them.
 336          This is more parentheses than are strictly necessary,
 337          but it looks clearer.  */
 338       print_subexp (exp, pos, stream, PREC_HYPER);
 339       fputs_filtered (" ? ", stream);
 340       print_subexp (exp, pos, stream, PREC_HYPER);
 341       fputs_filtered (" : ", stream);
 342       print_subexp (exp, pos, stream, PREC_HYPER);
 343       if ((int) prec > (int) PREC_COMMA)
 344         fputs_filtered (")", stream);
 345       return;
 346
 347     case TERNOP_SLICE:
 348       print_subexp (exp, pos, stream, PREC_SUFFIX);
 349       fputs_filtered ("(", stream);
 350       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 351       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 352       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 353       fputs_filtered (")", stream);
 354       return;
 355
 356     case STRUCTOP_STRUCT:
 357       tem = longest_to_int (exp->elts[pc + 1].longconst);
 358       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 359       print_subexp (exp, pos, stream, PREC_SUFFIX);
 360       fputs_filtered (".", stream);
 361       fputs_filtered (&exp->elts[pc + 2].string, stream);
 362       return;
 363
 364       /* Will not occur for Modula-2.  */
 365     case STRUCTOP_PTR:
 366       tem = longest_to_int (exp->elts[pc + 1].longconst);
 367       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 368       print_subexp (exp, pos, stream, PREC_SUFFIX);
 369       fputs_filtered ("->", stream);
 370       fputs_filtered (&exp->elts[pc + 2].string, stream);
 371       return;
 372
 373     case STRUCTOP_MEMBER:
 374       print_subexp (exp, pos, stream, PREC_SUFFIX);
 375       fputs_filtered (".*", stream);
 376       print_subexp (exp, pos, stream, PREC_SUFFIX);
 377       return;
 378
 379     case STRUCTOP_MPTR:
 380       print_subexp (exp, pos, stream, PREC_SUFFIX);
 381       fputs_filtered ("->*", stream);
 382       print_subexp (exp, pos, stream, PREC_SUFFIX);
 383       return;
 384
 385     case BINOP_SUBSCRIPT:
 386       print_subexp (exp, pos, stream, PREC_SUFFIX);
 387       fputs_filtered ("[", stream);
 388       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 389       fputs_filtered ("]", stream);
 390       return;
 391
 392     case UNOP_POSTINCREMENT:
 393       print_subexp (exp, pos, stream, PREC_SUFFIX);
 394       fputs_filtered ("++", stream);
 395       return;
 396
 397     case UNOP_POSTDECREMENT:
 398       print_subexp (exp, pos, stream, PREC_SUFFIX);
 399       fputs_filtered ("--", stream);
 400       return;
 401
 402     case UNOP_CAST:
 403       (*pos) += 2;
 404       if ((int) prec > (int) PREC_PREFIX)
 405         fputs_filtered ("(", stream);
 406       fputs_filtered ("(", stream);
 407       type_print (exp->elts[pc + 1].type, "", stream, 0);
 408       fputs_filtered (") ", stream);
 409       print_subexp (exp, pos, stream, PREC_PREFIX);
 410       if ((int) prec > (int) PREC_PREFIX)
 411         fputs_filtered (")", stream);
 412       return;
 413
 414     case UNOP_CAST_TYPE:
 415       if ((int) prec > (int) PREC_PREFIX)
 416         fputs_filtered ("(", stream);
 417       fputs_filtered ("(", stream);
 418       print_subexp (exp, pos, stream, PREC_PREFIX);
 419       fputs_filtered (") ", stream);
 420       print_subexp (exp, pos, stream, PREC_PREFIX);
 421       if ((int) prec > (int) PREC_PREFIX)
 422         fputs_filtered (")", stream);
 423       return;
 424
 425     case UNOP_DYNAMIC_CAST:
 426     case UNOP_REINTERPRET_CAST:
 427       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 428                       : "reinterpret_cast", stream);
 429       fputs_filtered ("<", stream);
 430       print_subexp (exp, pos, stream, PREC_PREFIX);
 431       fputs_filtered ("> (", stream);
 432       print_subexp (exp, pos, stream, PREC_PREFIX);
 433       fputs_filtered (")", stream);
 434       return;
 435
 436     case UNOP_MEMVAL:
 437       (*pos) += 2;
 438       if ((int) prec > (int) PREC_PREFIX)
 439         fputs_filtered ("(", stream);
 440       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 441           && exp->elts[pc + 3].opcode == OP_LONG)
 442         {
 443           struct value_print_options opts;
 444
 445           /* We have a minimal symbol fn, probably.  It's encoded
 446              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 447              Swallow the OP_LONG (including both its opcodes); ignore
 448              its type; print the value in the type of the MEMVAL.  */
 449           (*pos) += 4;
 450           val = value_at_lazy (exp->elts[pc + 1].type,
 451                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 452           get_raw_print_options (&opts);
 453           value_print (val, stream, &opts);
 454         }
 455       else
 456         {
 457           fputs_filtered ("{", stream);
 458           type_print (exp->elts[pc + 1].type, "", stream, 0);
 459           fputs_filtered ("} ", stream);
 460           print_subexp (exp, pos, stream, PREC_PREFIX);
 461         }
 462       if ((int) prec > (int) PREC_PREFIX)
 463         fputs_filtered (")", stream);
 464       return;
 465
 466     case UNOP_MEMVAL_TYPE:
 467       if ((int) prec > (int) PREC_PREFIX)
 468         fputs_filtered ("(", stream);
 469       fputs_filtered ("{", stream);
 470       print_subexp (exp, pos, stream, PREC_PREFIX);
 471       fputs_filtered ("} ", stream);
 472       print_subexp (exp, pos, stream, PREC_PREFIX);
 473       if ((int) prec > (int) PREC_PREFIX)
 474         fputs_filtered (")", stream);
 475       return;
 476
 477     case UNOP_MEMVAL_TLS:
 478       (*pos) += 3;
 479       if ((int) prec > (int) PREC_PREFIX)
 480         fputs_filtered ("(", stream);
 481       fputs_filtered ("{", stream);
 482       type_print (exp->elts[pc + 2].type, "", stream, 0);
 483       fputs_filtered ("} ", stream);
 484       print_subexp (exp, pos, stream, PREC_PREFIX);
 485       if ((int) prec > (int) PREC_PREFIX)
 486         fputs_filtered (")", stream);
 487       return;
 488
 489     case BINOP_ASSIGN_MODIFY:
 490       opcode = exp->elts[pc + 1].opcode;
 491       (*pos) += 2;
 492       myprec = PREC_ASSIGN;
 493       assoc = 1;
 494       assign_modify = 1;
 495       op_str = "???";
 496       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 497         if (op_print_tab[tem].opcode == opcode)
 498           {
 499             op_str = op_print_tab[tem].string;
 500             break;
 501           }
 502       if (op_print_tab[tem].opcode != opcode)
 503         /* Not found; don't try to keep going because we don't know how
 504            to interpret further elements.  */
 505         error (_("Invalid expression"));
 506       break;
 507
 508       /* C++ ops */
 509
 510     case OP_THIS:
 511       ++(*pos);
 512       if (exp->language_defn->la_name_of_this)
 513         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 514       else
 515         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 516                           exp->language_defn->la_name);
 517       return;
 518
 519       /* Modula-2 ops */
 520
 521     case MULTI_SUBSCRIPT:
 522       (*pos) += 2;
 523       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 524       print_subexp (exp, pos, stream, PREC_SUFFIX);
 525       fprintf_unfiltered (stream, " [");
 526       for (tem = 0; tem < nargs; tem++)
 527         {
 528           if (tem != 0)
 529             fprintf_unfiltered (stream, ", ");
 530           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 531         }
 532       fprintf_unfiltered (stream, "]");
 533       return;
 534
 535     case BINOP_VAL:
 536       (*pos) += 2;
 537       fprintf_unfiltered (stream, "VAL(");
 538       type_print (exp->elts[pc + 1].type, "", stream, 0);
 539       fprintf_unfiltered (stream, ",");
 540       print_subexp (exp, pos, stream, PREC_PREFIX);
 541       fprintf_unfiltered (stream, ")");
 542       return;
 543
 544     case TYPE_INSTANCE:
 545       {
 546         LONGEST count = exp->elts[pc + 1].longconst;
 547
 548         /* The COUNT.  */
 549         (*pos)++;
 550         fputs_unfiltered ("TypesInstance(", stream);
 551         while (count-- > 0)
 552           {
 553             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 554             if (count > 0)
 555               fputs_unfiltered (",", stream);
 556           }
 557         fputs_unfiltered (",", stream);
 558         /* Ending COUNT and ending TYPE_INSTANCE.  */
 559         (*pos) += 2;
 560         print_subexp (exp, pos, stream, PREC_PREFIX);
 561         fputs_unfiltered (")", stream);
 562         return;
 563       }
 564
 565       /* Default ops */
 566
 567     default:
 568       op_str = "???";
 569       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 570         if (op_print_tab[tem].opcode == opcode)
 571           {
 572             op_str = op_print_tab[tem].string;
 573             myprec = op_print_tab[tem].precedence;
 574             assoc = op_print_tab[tem].right_assoc;
 575             break;
 576           }
 577       if (op_print_tab[tem].opcode != opcode)
 578         /* Not found; don't try to keep going because we don't know how
 579            to interpret further elements.  For example, this happens
 580            if opcode is OP_TYPE.  */
 581         error (_("Invalid expression"));
 582     }
 583
 584   /* Note that PREC_BUILTIN will always emit parentheses.  */
 585   if ((int) myprec < (int) prec)
 586     fputs_filtered ("(", stream);
 587   if ((int) opcode > (int) BINOP_END)
 588     {
 589       if (assoc)
 590         {
 591           /* Unary postfix operator.  */
 592           print_subexp (exp, pos, stream, PREC_SUFFIX);
 593           fputs_filtered (op_str, stream);
 594         }
 595       else
 596         {
 597           /* Unary prefix operator.  */
 598           fputs_filtered (op_str, stream);
 599           if (myprec == PREC_BUILTIN_FUNCTION)
 600             fputs_filtered ("(", stream);
 601           print_subexp (exp, pos, stream, PREC_PREFIX);
 602           if (myprec == PREC_BUILTIN_FUNCTION)
 603             fputs_filtered (")", stream);
 604         }
 605     }
 606   else
 607     {
 608       /* Binary operator.  */
 609       /* Print left operand.
 610          If operator is right-associative,
 611          increment precedence for this operand.  */
 612       print_subexp (exp, pos, stream,
 613                     (enum precedence) ((int) myprec + assoc));
 614       /* Print the operator itself.  */
 615       if (assign_modify)
 616         fprintf_filtered (stream, " %s= ", op_str);
 617       else if (op_str[0] == ',')
 618         fprintf_filtered (stream, "%s ", op_str);
 619       else
 620         fprintf_filtered (stream, " %s ", op_str);
 621       /* Print right operand.
 622          If operator is left-associative,
 623          increment precedence for this operand.  */
 624       print_subexp (exp, pos, stream,
 625                     (enum precedence) ((int) myprec + !assoc));
 626     }
 627
 628   if ((int) myprec < (int) prec)
 629     fputs_filtered (")", stream);
 630 }
 631
 632 /* Return the operator corresponding to opcode OP as
 633    a string.   NULL indicates that the opcode was not found in the
 634    current language table.  */
 635 char *
 636 op_string (enum exp_opcode op)
 637 {
 638   int tem;
 639   const struct op_print *op_print_tab;
 640
 641   op_print_tab = current_language->la_op_print_tab;
 642   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 643     if (op_print_tab[tem].opcode == op)
 644       return op_print_tab[tem].string;
 645   return NULL;
 646 }
 647
 648 /* Support for dumping the raw data from expressions in a human readable
 649    form.  */
 650
 651 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 652
 653 /* Name for OPCODE, when it appears in expression EXP.  */
 654
 655 char *
 656 op_name (struct expression *exp, enum exp_opcode opcode)
 657 {
 658   return exp->language_defn->la_exp_desc->op_name (opcode);
 659 }
 660
 661 /* Default name for the standard operator OPCODE (i.e., one defined in
 662    the definition of enum exp_opcode).  */
 663
 664 char *
 665 op_name_standard (enum exp_opcode opcode)
 666 {
 667   switch (opcode)
 668     {
 669     default:
 670       {
 671         static char buf[30];
 672
 673         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 674         return buf;
 675       }
 676 #define OP(name)        \
 677     case name:          \
 678       return #name ;
 679 #include "std-operator.def"
 680 #undef OP
 681     }
 682 }
 683
 684 /* Print a raw dump of expression EXP to STREAM.
 685    NOTE, if non-NULL, is printed as extra explanatory text.  */
 686
 687 void
 688 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 689                      char *note)
 690 {
 691   int elt;
 692   char *opcode_name;
 693   char *eltscan;
 694   int eltsize;
 695
 696   fprintf_filtered (stream, "Dump of expression @ ");
 697   gdb_print_host_address (exp, stream);
 698   if (note)
 699     fprintf_filtered (stream, ", %s:", note);
 700   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 701                     exp->language_defn->la_name, exp->nelts,
 702                     (long) sizeof (union exp_element));
 703   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 704                     "Hex Value", "String Value");
 705   for (elt = 0; elt < exp->nelts; elt++)
 706     {
 707       fprintf_filtered (stream, "\t%5d  ", elt);
 708       opcode_name = op_name (exp, exp->elts[elt].opcode);
 709
 710       fprintf_filtered (stream, "%20s  ", opcode_name);
 711       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 712       fprintf_filtered (stream, "  ");
 713
 714       for (eltscan = (char *) &exp->elts[elt],
 715            eltsize = sizeof (union exp_element);
 716            eltsize-- > 0;
 717            eltscan++)
 718         {
 719           fprintf_filtered (stream, "%c",
 720                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 721         }
 722       fprintf_filtered (stream, "\n");
 723     }
 724 }
 725
 726 /* Dump the subexpression of prefix expression EXP whose operator is at
 727    position ELT onto STREAM.  Returns the position of the next
 728    subexpression in EXP.  */
 729
 730 int
 731 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 732 {
 733   static int indent = 0;
 734   int i;
 735
 736   fprintf_filtered (stream, "\n");
 737   fprintf_filtered (stream, "\t%5d  ", elt);
 738
 739   for (i = 1; i <= indent; i++)
 740     fprintf_filtered (stream, " ");
 741   indent += 2;
 742
 743   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 744
 745   elt = dump_subexp_body (exp, stream, elt);
 746
 747   indent -= 2;
 748
 749   return elt;
 750 }
 751
 752 /* Dump the operands of prefix expression EXP whose opcode is at
 753    position ELT onto STREAM.  Returns the position of the next
 754    subexpression in EXP.  */
 755
 756 static int
 757 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 758 {
 759   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 760 }
 761
 762 /* Default value for subexp_body in exp_descriptor vector.  */
 763
 764 int
 765 dump_subexp_body_standard (struct expression *exp,
 766                            struct ui_file *stream, int elt)
 767 {
 768   int opcode = exp->elts[elt++].opcode;
 769
 770   switch (opcode)
 771     {
 772     case TERNOP_COND:
 773     case TERNOP_SLICE:
 774       elt = dump_subexp (exp, stream, elt);
 775       /* FALL THROUGH */
 776     case BINOP_ADD:
 777     case BINOP_SUB:
 778     case BINOP_MUL:
 779     case BINOP_DIV:
 780     case BINOP_REM:
 781     case BINOP_MOD:
 782     case BINOP_LSH:
 783     case BINOP_RSH:
 784     case BINOP_LOGICAL_AND:
 785     case BINOP_LOGICAL_OR:
 786     case BINOP_BITWISE_AND:
 787     case BINOP_BITWISE_IOR:
 788     case BINOP_BITWISE_XOR:
 789     case BINOP_EQUAL:
 790     case BINOP_NOTEQUAL:
 791     case BINOP_LESS:
 792     case BINOP_GTR:
 793     case BINOP_LEQ:
 794     case BINOP_GEQ:
 795     case BINOP_REPEAT:
 796     case BINOP_ASSIGN:
 797     case BINOP_COMMA:
 798     case BINOP_SUBSCRIPT:
 799     case BINOP_EXP:
 800     case BINOP_MIN:
 801     case BINOP_MAX:
 802     case BINOP_INTDIV:
 803     case BINOP_ASSIGN_MODIFY:
 804     case BINOP_VAL:
 805     case BINOP_CONCAT:
 806     case BINOP_IN:
 807     case BINOP_RANGE:
 808     case BINOP_END:
 809     case STRUCTOP_MEMBER:
 810     case STRUCTOP_MPTR:
 811       elt = dump_subexp (exp, stream, elt);
 812       /* FALL THROUGH */
 813     case UNOP_NEG:
 814     case UNOP_LOGICAL_NOT:
 815     case UNOP_COMPLEMENT:
 816     case UNOP_IND:
 817     case UNOP_ADDR:
 818     case UNOP_PREINCREMENT:
 819     case UNOP_POSTINCREMENT:
 820     case UNOP_PREDECREMENT:
 821     case UNOP_POSTDECREMENT:
 822     case UNOP_SIZEOF:
 823     case UNOP_PLUS:
 824     case UNOP_CAP:
 825     case UNOP_CHR:
 826     case UNOP_ORD:
 827     case UNOP_ABS:
 828     case UNOP_FLOAT:
 829     case UNOP_HIGH:
 830     case UNOP_MAX:
 831     case UNOP_MIN:
 832     case UNOP_ODD:
 833     case UNOP_TRUNC:
 834       elt = dump_subexp (exp, stream, elt);
 835       break;
 836     case OP_LONG:
 837       fprintf_filtered (stream, "Type @");
 838       gdb_print_host_address (exp->elts[elt].type, stream);
 839       fprintf_filtered (stream, " (");
 840       type_print (exp->elts[elt].type, NULL, stream, 0);
 841       fprintf_filtered (stream, "), value %ld (0x%lx)",
 842                         (long) exp->elts[elt + 1].longconst,
 843                         (long) exp->elts[elt + 1].longconst);
 844       elt += 3;
 845       break;
 846     case OP_DOUBLE:
 847       fprintf_filtered (stream, "Type @");
 848       gdb_print_host_address (exp->elts[elt].type, stream);
 849       fprintf_filtered (stream, " (");
 850       type_print (exp->elts[elt].type, NULL, stream, 0);
 851       fprintf_filtered (stream, "), value %g",
 852                         (double) exp->elts[elt + 1].doubleconst);
 853       elt += 3;
 854       break;
 855     case OP_VAR_VALUE:
 856       fprintf_filtered (stream, "Block @");
 857       gdb_print_host_address (exp->elts[elt].block, stream);
 858       fprintf_filtered (stream, ", symbol @");
 859       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 860       fprintf_filtered (stream, " (%s)",
 861                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 862       elt += 3;
 863       break;
 864     case OP_VAR_ENTRY_VALUE:
 865       fprintf_filtered (stream, "Entry value of symbol @");
 866       gdb_print_host_address (exp->elts[elt].symbol, stream);
 867       fprintf_filtered (stream, " (%s)",
 868                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 869       elt += 2;
 870       break;
 871     case OP_LAST:
 872       fprintf_filtered (stream, "History element %ld",
 873                         (long) exp->elts[elt].longconst);
 874       elt += 2;
 875       break;
 876     case OP_REGISTER:
 877       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 878       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 879       break;
 880     case OP_INTERNALVAR:
 881       fprintf_filtered (stream, "Internal var @");
 882       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 883       fprintf_filtered (stream, " (%s)",
 884                         internalvar_name (exp->elts[elt].internalvar));
 885       elt += 2;
 886       break;
 887     case OP_FUNCALL:
 888       {
 889         int i, nargs;
 890
 891         nargs = longest_to_int (exp->elts[elt].longconst);
 892
 893         fprintf_filtered (stream, "Number of args: %d", nargs);
 894         elt += 2;
 895
 896         for (i = 1; i <= nargs + 1; i++)
 897           elt = dump_subexp (exp, stream, elt);
 898       }
 899       break;
 900     case OP_ARRAY:
 901       {
 902         int lower, upper;
 903         int i;
 904
 905         lower = longest_to_int (exp->elts[elt].longconst);
 906         upper = longest_to_int (exp->elts[elt + 1].longconst);
 907
 908         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 909         elt += 3;
 910
 911         for (i = 1; i <= upper - lower + 1; i++)
 912           elt = dump_subexp (exp, stream, elt);
 913       }
 914       break;
 915     case UNOP_DYNAMIC_CAST:
 916     case UNOP_REINTERPRET_CAST:
 917     case UNOP_CAST_TYPE:
 918     case UNOP_MEMVAL_TYPE:
 919       fprintf_filtered (stream, " (");
 920       elt = dump_subexp (exp, stream, elt);
 921       fprintf_filtered (stream, ")");
 922       elt = dump_subexp (exp, stream, elt);
 923       break;
 924     case UNOP_MEMVAL:
 925     case UNOP_CAST:
 926       fprintf_filtered (stream, "Type @");
 927       gdb_print_host_address (exp->elts[elt].type, stream);
 928       fprintf_filtered (stream, " (");
 929       type_print (exp->elts[elt].type, NULL, stream, 0);
 930       fprintf_filtered (stream, ")");
 931       elt = dump_subexp (exp, stream, elt + 2);
 932       break;
 933     case UNOP_MEMVAL_TLS:
 934       fprintf_filtered (stream, "TLS type @");
 935       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 936       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 937                         (exp->elts[elt].objfile == NULL ? "(null)"
 938                          : exp->elts[elt].objfile->name));
 939       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 940       fprintf_filtered (stream, ")");
 941       elt = dump_subexp (exp, stream, elt + 3);
 942       break;
 943     case OP_TYPE:
 944       fprintf_filtered (stream, "Type @");
 945       gdb_print_host_address (exp->elts[elt].type, stream);
 946       fprintf_filtered (stream, " (");
 947       type_print (exp->elts[elt].type, NULL, stream, 0);
 948       fprintf_filtered (stream, ")");
 949       elt += 2;
 950       break;
 951     case OP_TYPEOF:
 952     case OP_DECLTYPE:
 953       fprintf_filtered (stream, "Typeof (");
 954       elt = dump_subexp (exp, stream, elt);
 955       fprintf_filtered (stream, ")");
 956       break;
 957     case STRUCTOP_STRUCT:
 958     case STRUCTOP_PTR:
 959       {
 960         char *elem_name;
 961         int len;
 962
 963         len = longest_to_int (exp->elts[elt].longconst);
 964         elem_name = &exp->elts[elt + 1].string;
 965
 966         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 967         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 968       }
 969       break;
 970     case OP_SCOPE:
 971       {
 972         char *elem_name;
 973         int len;
 974
 975         fprintf_filtered (stream, "Type @");
 976         gdb_print_host_address (exp->elts[elt].type, stream);
 977         fprintf_filtered (stream, " (");
 978         type_print (exp->elts[elt].type, NULL, stream, 0);
 979         fprintf_filtered (stream, ") ");
 980
 981         len = longest_to_int (exp->elts[elt + 1].longconst);
 982         elem_name = &exp->elts[elt + 2].string;
 983
 984         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
 985         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
 986       }
 987       break;
 988     case TYPE_INSTANCE:
 989       {
 990         LONGEST len;
 991
 992         len = exp->elts[elt++].longconst;
 993         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
 994         while (len-- > 0)
 995           {
 996             fprintf_filtered (stream, "Type @");
 997             gdb_print_host_address (exp->elts[elt].type, stream);
 998             fprintf_filtered (stream, " (");
 999             type_print (exp->elts[elt].type, NULL, stream, 0);
1000             fprintf_filtered (stream, ")");
1001             elt++;
1002             if (len > 0)
1003               fputs_filtered (", ", stream);
1004           }
1005         /* Ending LEN and ending TYPE_INSTANCE.  */
1006         elt += 2;
1007         elt = dump_subexp (exp, stream, elt);
1008       }
1009       break;
1010     default:
1011     case OP_NULL:
1012     case MULTI_SUBSCRIPT:
1013     case OP_F77_UNDETERMINED_ARGLIST:
1014     case OP_COMPLEX:
1015     case OP_STRING:
1016     case OP_BOOL:
1017     case OP_M2_STRING:
1018     case OP_THIS:
1019     case OP_NAME:
1020       fprintf_filtered (stream, "Unknown format");
1021     }
1022
1023   return elt;
1024 }
1025
1026 void
1027 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1028 {
1029   int elt;
1030
1031   fprintf_filtered (stream, "Dump of expression @ ");
1032   gdb_print_host_address (exp, stream);
1033   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1034   print_expression (exp, stream);
1035   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1036                     exp->language_defn->la_name, exp->nelts,
1037                     (long) sizeof (union exp_element));
1038   fputs_filtered ("\n", stream);
1039
1040   for (elt = 0; elt < exp->nelts;)
1041     elt = dump_subexp (exp, stream, elt);
1042   fputs_filtered ("\n", stream);
1043 }