gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   4    1998, 1999, 2000, 2003, 2007, 2008, 2009, 2010, 2011
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "symtab.h"
  24 #include "gdbtypes.h"
  25 #include "expression.h"
  26 #include "value.h"
  27 #include "language.h"
  28 #include "parser-defs.h"
  29 #include "user-regs.h"          /* For user_reg_map_regnum_to_name.  */
  30 #include "target.h"
  31 #include "gdb_string.h"
  32 #include "block.h"
  33 #include "objfiles.h"
  34 #include "gdb_assert.h"
  35 #include "valprint.h"
  36
  37 #ifdef HAVE_CTYPE_H
  38 #include <ctype.h>
  39 #endif
  40
  41 void
  42 print_expression (struct expression *exp, struct ui_file *stream)
  43 {
  44   int pc = 0;
  45
  46   print_subexp (exp, &pc, stream, PREC_NULL);
  47 }
  48
  49 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  50    PREC is the precedence of the surrounding operator;
  51    if the precedence of the main operator of this subexpression is less,
  52    parentheses are needed here.  */
  53
  54 void
  55 print_subexp (struct expression *exp, int *pos,
  56               struct ui_file *stream, enum precedence prec)
  57 {
  58   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  59 }
  60
  61 /* Standard implementation of print_subexp for use in language_defn
  62    vectors.  */
  63 void
  64 print_subexp_standard (struct expression *exp, int *pos,
  65                        struct ui_file *stream, enum precedence prec)
  66 {
  67   unsigned tem;
  68   const struct op_print *op_print_tab;
  69   int pc;
  70   unsigned nargs;
  71   char *op_str;
  72   int assign_modify = 0;
  73   enum exp_opcode opcode;
  74   enum precedence myprec = PREC_NULL;
  75   /* Set to 1 for a right-associative operator.  */
  76   int assoc = 0;
  77   struct value *val;
  78   char *tempstr = NULL;
  79
  80   op_print_tab = exp->language_defn->la_op_print_tab;
  81   pc = (*pos)++;
  82   opcode = exp->elts[pc].opcode;
  83   switch (opcode)
  84     {
  85       /* Common ops */
  86
  87     case OP_SCOPE:
  88       myprec = PREC_PREFIX;
  89       assoc = 0;
  90       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  91       fputs_filtered ("::", stream);
  92       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  93       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  94       fputs_filtered (&exp->elts[pc + 3].string, stream);
  95       return;
  96
  97     case OP_LONG:
  98       {
  99         struct value_print_options opts;
 100
 101         get_raw_print_options (&opts);
 102         (*pos) += 3;
 103         value_print (value_from_longest (exp->elts[pc + 1].type,
 104                                          exp->elts[pc + 2].longconst),
 105                      stream, &opts);
 106       }
 107       return;
 108
 109     case OP_DOUBLE:
 110       {
 111         struct value_print_options opts;
 112
 113         get_raw_print_options (&opts);
 114         (*pos) += 3;
 115         value_print (value_from_double (exp->elts[pc + 1].type,
 116                                         exp->elts[pc + 2].doubleconst),
 117                      stream, &opts);
 118       }
 119       return;
 120
 121     case OP_VAR_VALUE:
 122       {
 123         struct block *b;
 124
 125         (*pos) += 3;
 126         b = exp->elts[pc + 1].block;
 127         if (b != NULL
 128             && BLOCK_FUNCTION (b) != NULL
 129             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 130           {
 131             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 132             fputs_filtered ("::", stream);
 133           }
 134         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 135       }
 136       return;
 137
 138     case OP_LAST:
 139       (*pos) += 2;
 140       fprintf_filtered (stream, "$%d",
 141                         longest_to_int (exp->elts[pc + 1].longconst));
 142       return;
 143
 144     case OP_REGISTER:
 145       {
 146         const char *name = &exp->elts[pc + 2].string;
 147
 148         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 149         fprintf_filtered (stream, "$%s", name);
 150         return;
 151       }
 152
 153     case OP_BOOL:
 154       (*pos) += 2;
 155       fprintf_filtered (stream, "%s",
 156                         longest_to_int (exp->elts[pc + 1].longconst)
 157                         ? "TRUE" : "FALSE");
 158       return;
 159
 160     case OP_INTERNALVAR:
 161       (*pos) += 2;
 162       fprintf_filtered (stream, "$%s",
 163                         internalvar_name (exp->elts[pc + 1].internalvar));
 164       return;
 165
 166     case OP_FUNCALL:
 167       (*pos) += 2;
 168       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 169       print_subexp (exp, pos, stream, PREC_SUFFIX);
 170       fputs_filtered (" (", stream);
 171       for (tem = 0; tem < nargs; tem++)
 172         {
 173           if (tem != 0)
 174             fputs_filtered (", ", stream);
 175           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 176         }
 177       fputs_filtered (")", stream);
 178       return;
 179
 180     case OP_NAME:
 181       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 182       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 183       fputs_filtered (&exp->elts[pc + 2].string, stream);
 184       return;
 185
 186     case OP_STRING:
 187       {
 188         struct value_print_options opts;
 189
 190         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 191         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 192         /* LA_PRINT_STRING will print using the current repeat count threshold.
 193            If necessary, we can temporarily set it to zero, or pass it as an
 194            additional parameter to LA_PRINT_STRING.  -fnf */
 195         get_user_print_options (&opts);
 196         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 197                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 198       }
 199       return;
 200
 201     case OP_BITSTRING:
 202       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 203       (*pos)
 204         += 3 + BYTES_TO_EXP_ELEM ((nargs + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
 205       fprintf_unfiltered (stream, "B'<unimplemented>'");
 206       return;
 207
 208     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 209                                    NSString constant.  */
 210       {
 211         struct value_print_options opts;
 212
 213         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 214         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 215         fputs_filtered ("@\"", stream);
 216         get_user_print_options (&opts);
 217         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 218                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 219         fputs_filtered ("\"", stream);
 220       }
 221       return;
 222
 223     case OP_OBJC_MSGCALL:
 224       {                 /* Objective C message (method) call.  */
 225         char *selector;
 226
 227         (*pos) += 3;
 228         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 229         fprintf_unfiltered (stream, "[");
 230         print_subexp (exp, pos, stream, PREC_SUFFIX);
 231         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 232                                      &selector, 1024, NULL))
 233           {
 234             error (_("bad selector"));
 235             return;
 236           }
 237         if (nargs)
 238           {
 239             char *s, *nextS;
 240
 241             s = alloca (strlen (selector) + 1);
 242             strcpy (s, selector);
 243             for (tem = 0; tem < nargs; tem++)
 244               {
 245                 nextS = strchr (s, ':');
 246                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 247                 *nextS = '\0';
 248                 fprintf_unfiltered (stream, " %s: ", s);
 249                 s = nextS + 1;
 250                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 251               }
 252           }
 253         else
 254           {
 255             fprintf_unfiltered (stream, " %s", selector);
 256           }
 257         fprintf_unfiltered (stream, "]");
 258         /* "selector" was malloc'd by target_read_string. Free it.  */
 259         xfree (selector);
 260         return;
 261       }
 262
 263     case OP_ARRAY:
 264       (*pos) += 3;
 265       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 266       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 267       nargs++;
 268       tem = 0;
 269       if (exp->elts[pc + 4].opcode == OP_LONG
 270           && exp->elts[pc + 5].type
 271              == builtin_type (exp->gdbarch)->builtin_char
 272           && exp->language_defn->la_language == language_c)
 273         {
 274           /* Attempt to print C character arrays using string syntax.
 275              Walk through the args, picking up one character from each
 276              of the OP_LONG expression elements.  If any array element
 277              does not match our expection of what we should find for
 278              a simple string, revert back to array printing.  Note that
 279              the last expression element is an explicit null terminator
 280              byte, which doesn't get printed. */
 281           tempstr = alloca (nargs);
 282           pc += 4;
 283           while (tem < nargs)
 284             {
 285               if (exp->elts[pc].opcode != OP_LONG
 286                   || exp->elts[pc + 1].type
 287                      != builtin_type (exp->gdbarch)->builtin_char)
 288                 {
 289                   /* Not a simple array of char, use regular array printing. */
 290                   tem = 0;
 291                   break;
 292                 }
 293               else
 294                 {
 295                   tempstr[tem++] =
 296                     longest_to_int (exp->elts[pc + 2].longconst);
 297                   pc += 4;
 298                 }
 299             }
 300         }
 301       if (tem > 0)
 302         {
 303           struct value_print_options opts;
 304
 305           get_user_print_options (&opts);
 306           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 307                            tempstr, nargs - 1, NULL, 0, &opts);
 308           (*pos) = pc;
 309         }
 310       else
 311         {
 312           fputs_filtered (" {", stream);
 313           for (tem = 0; tem < nargs; tem++)
 314             {
 315               if (tem != 0)
 316                 {
 317                   fputs_filtered (", ", stream);
 318                 }
 319               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 320             }
 321           fputs_filtered ("}", stream);
 322         }
 323       return;
 324
 325     case OP_LABELED:
 326       tem = longest_to_int (exp->elts[pc + 1].longconst);
 327       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 328       /* Gcc support both these syntaxes.  Unsure which is preferred.  */
 329 #if 1
 330       fputs_filtered (&exp->elts[pc + 2].string, stream);
 331       fputs_filtered (": ", stream);
 332 #else
 333       fputs_filtered (".", stream);
 334       fputs_filtered (&exp->elts[pc + 2].string, stream);
 335       fputs_filtered ("=", stream);
 336 #endif
 337       print_subexp (exp, pos, stream, PREC_SUFFIX);
 338       return;
 339
 340     case TERNOP_COND:
 341       if ((int) prec > (int) PREC_COMMA)
 342         fputs_filtered ("(", stream);
 343       /* Print the subexpressions, forcing parentheses
 344          around any binary operations within them.
 345          This is more parentheses than are strictly necessary,
 346          but it looks clearer.  */
 347       print_subexp (exp, pos, stream, PREC_HYPER);
 348       fputs_filtered (" ? ", stream);
 349       print_subexp (exp, pos, stream, PREC_HYPER);
 350       fputs_filtered (" : ", stream);
 351       print_subexp (exp, pos, stream, PREC_HYPER);
 352       if ((int) prec > (int) PREC_COMMA)
 353         fputs_filtered (")", stream);
 354       return;
 355
 356     case TERNOP_SLICE:
 357     case TERNOP_SLICE_COUNT:
 358       print_subexp (exp, pos, stream, PREC_SUFFIX);
 359       fputs_filtered ("(", stream);
 360       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 361       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 362       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 363       fputs_filtered (")", stream);
 364       return;
 365
 366     case STRUCTOP_STRUCT:
 367       tem = longest_to_int (exp->elts[pc + 1].longconst);
 368       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 369       print_subexp (exp, pos, stream, PREC_SUFFIX);
 370       fputs_filtered (".", stream);
 371       fputs_filtered (&exp->elts[pc + 2].string, stream);
 372       return;
 373
 374       /* Will not occur for Modula-2 */
 375     case STRUCTOP_PTR:
 376       tem = longest_to_int (exp->elts[pc + 1].longconst);
 377       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 378       print_subexp (exp, pos, stream, PREC_SUFFIX);
 379       fputs_filtered ("->", stream);
 380       fputs_filtered (&exp->elts[pc + 2].string, stream);
 381       return;
 382
 383     case STRUCTOP_MEMBER:
 384       print_subexp (exp, pos, stream, PREC_SUFFIX);
 385       fputs_filtered (".*", stream);
 386       print_subexp (exp, pos, stream, PREC_SUFFIX);
 387       return;
 388
 389     case STRUCTOP_MPTR:
 390       print_subexp (exp, pos, stream, PREC_SUFFIX);
 391       fputs_filtered ("->*", stream);
 392       print_subexp (exp, pos, stream, PREC_SUFFIX);
 393       return;
 394
 395     case BINOP_SUBSCRIPT:
 396       print_subexp (exp, pos, stream, PREC_SUFFIX);
 397       fputs_filtered ("[", stream);
 398       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 399       fputs_filtered ("]", stream);
 400       return;
 401
 402     case UNOP_POSTINCREMENT:
 403       print_subexp (exp, pos, stream, PREC_SUFFIX);
 404       fputs_filtered ("++", stream);
 405       return;
 406
 407     case UNOP_POSTDECREMENT:
 408       print_subexp (exp, pos, stream, PREC_SUFFIX);
 409       fputs_filtered ("--", stream);
 410       return;
 411
 412     case UNOP_CAST:
 413       (*pos) += 2;
 414       if ((int) prec > (int) PREC_PREFIX)
 415         fputs_filtered ("(", stream);
 416       fputs_filtered ("(", stream);
 417       type_print (exp->elts[pc + 1].type, "", stream, 0);
 418       fputs_filtered (") ", stream);
 419       print_subexp (exp, pos, stream, PREC_PREFIX);
 420       if ((int) prec > (int) PREC_PREFIX)
 421         fputs_filtered (")", stream);
 422       return;
 423
 424     case UNOP_DYNAMIC_CAST:
 425     case UNOP_REINTERPRET_CAST:
 426       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 427                       : "reinterpret_cast", stream);
 428       fputs_filtered ("<", stream);
 429       (*pos) += 2;
 430       type_print (exp->elts[pc + 1].type, "", stream, 0);
 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_TLS:
 467       (*pos) += 3;
 468       if ((int) prec > (int) PREC_PREFIX)
 469         fputs_filtered ("(", stream);
 470       fputs_filtered ("{", stream);
 471       type_print (exp->elts[pc + 2].type, "", stream, 0);
 472       fputs_filtered ("} ", stream);
 473       print_subexp (exp, pos, stream, PREC_PREFIX);
 474       if ((int) prec > (int) PREC_PREFIX)
 475         fputs_filtered (")", stream);
 476       return;
 477
 478     case BINOP_ASSIGN_MODIFY:
 479       opcode = exp->elts[pc + 1].opcode;
 480       (*pos) += 2;
 481       myprec = PREC_ASSIGN;
 482       assoc = 1;
 483       assign_modify = 1;
 484       op_str = "???";
 485       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 486         if (op_print_tab[tem].opcode == opcode)
 487           {
 488             op_str = op_print_tab[tem].string;
 489             break;
 490           }
 491       if (op_print_tab[tem].opcode != opcode)
 492         /* Not found; don't try to keep going because we don't know how
 493            to interpret further elements.  */
 494         error (_("Invalid expression"));
 495       break;
 496
 497       /* C++ ops */
 498
 499     case OP_THIS:
 500       ++(*pos);
 501       fputs_filtered ("this", stream);
 502       return;
 503
 504       /* Objective-C ops */
 505
 506     case OP_OBJC_SELF:
 507       ++(*pos);
 508       fputs_filtered ("self", stream);  /* The ObjC equivalent of "this".  */
 509       return;
 510
 511       /* Modula-2 ops */
 512
 513     case MULTI_SUBSCRIPT:
 514       (*pos) += 2;
 515       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 516       print_subexp (exp, pos, stream, PREC_SUFFIX);
 517       fprintf_unfiltered (stream, " [");
 518       for (tem = 0; tem < nargs; tem++)
 519         {
 520           if (tem != 0)
 521             fprintf_unfiltered (stream, ", ");
 522           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 523         }
 524       fprintf_unfiltered (stream, "]");
 525       return;
 526
 527     case BINOP_VAL:
 528       (*pos) += 2;
 529       fprintf_unfiltered (stream, "VAL(");
 530       type_print (exp->elts[pc + 1].type, "", stream, 0);
 531       fprintf_unfiltered (stream, ",");
 532       print_subexp (exp, pos, stream, PREC_PREFIX);
 533       fprintf_unfiltered (stream, ")");
 534       return;
 535
 536       /* Default ops */
 537
 538     default:
 539       op_str = "???";
 540       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 541         if (op_print_tab[tem].opcode == opcode)
 542           {
 543             op_str = op_print_tab[tem].string;
 544             myprec = op_print_tab[tem].precedence;
 545             assoc = op_print_tab[tem].right_assoc;
 546             break;
 547           }
 548       if (op_print_tab[tem].opcode != opcode)
 549         /* Not found; don't try to keep going because we don't know how
 550            to interpret further elements.  For example, this happens
 551            if opcode is OP_TYPE.  */
 552         error (_("Invalid expression"));
 553     }
 554
 555   /* Note that PREC_BUILTIN will always emit parentheses. */
 556   if ((int) myprec < (int) prec)
 557     fputs_filtered ("(", stream);
 558   if ((int) opcode > (int) BINOP_END)
 559     {
 560       if (assoc)
 561         {
 562           /* Unary postfix operator.  */
 563           print_subexp (exp, pos, stream, PREC_SUFFIX);
 564           fputs_filtered (op_str, stream);
 565         }
 566       else
 567         {
 568           /* Unary prefix operator.  */
 569           fputs_filtered (op_str, stream);
 570           if (myprec == PREC_BUILTIN_FUNCTION)
 571             fputs_filtered ("(", stream);
 572           print_subexp (exp, pos, stream, PREC_PREFIX);
 573           if (myprec == PREC_BUILTIN_FUNCTION)
 574             fputs_filtered (")", stream);
 575         }
 576     }
 577   else
 578     {
 579       /* Binary operator.  */
 580       /* Print left operand.
 581          If operator is right-associative,
 582          increment precedence for this operand.  */
 583       print_subexp (exp, pos, stream,
 584                     (enum precedence) ((int) myprec + assoc));
 585       /* Print the operator itself.  */
 586       if (assign_modify)
 587         fprintf_filtered (stream, " %s= ", op_str);
 588       else if (op_str[0] == ',')
 589         fprintf_filtered (stream, "%s ", op_str);
 590       else
 591         fprintf_filtered (stream, " %s ", op_str);
 592       /* Print right operand.
 593          If operator is left-associative,
 594          increment precedence for this operand.  */
 595       print_subexp (exp, pos, stream,
 596                     (enum precedence) ((int) myprec + !assoc));
 597     }
 598
 599   if ((int) myprec < (int) prec)
 600     fputs_filtered (")", stream);
 601 }
 602
 603 /* Return the operator corresponding to opcode OP as
 604    a string.   NULL indicates that the opcode was not found in the
 605    current language table.  */
 606 char *
 607 op_string (enum exp_opcode op)
 608 {
 609   int tem;
 610   const struct op_print *op_print_tab;
 611
 612   op_print_tab = current_language->la_op_print_tab;
 613   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 614     if (op_print_tab[tem].opcode == op)
 615       return op_print_tab[tem].string;
 616   return NULL;
 617 }
 618
 619 /* Support for dumping the raw data from expressions in a human readable
 620    form.  */
 621
 622 static char *op_name (struct expression *, enum exp_opcode);
 623 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 624
 625 /* Name for OPCODE, when it appears in expression EXP. */
 626
 627 static char *
 628 op_name (struct expression *exp, enum exp_opcode opcode)
 629 {
 630   return exp->language_defn->la_exp_desc->op_name (opcode);
 631 }
 632
 633 /* Default name for the standard operator OPCODE (i.e., one defined in
 634    the definition of enum exp_opcode).  */
 635
 636 char *
 637 op_name_standard (enum exp_opcode opcode)
 638 {
 639   switch (opcode)
 640     {
 641     default:
 642       {
 643         static char buf[30];
 644
 645         sprintf (buf, "<unknown %d>", opcode);
 646         return buf;
 647       }
 648     case OP_NULL:
 649       return "OP_NULL";
 650     case BINOP_ADD:
 651       return "BINOP_ADD";
 652     case BINOP_SUB:
 653       return "BINOP_SUB";
 654     case BINOP_MUL:
 655       return "BINOP_MUL";
 656     case BINOP_DIV:
 657       return "BINOP_DIV";
 658     case BINOP_REM:
 659       return "BINOP_REM";
 660     case BINOP_MOD:
 661       return "BINOP_MOD";
 662     case BINOP_LSH:
 663       return "BINOP_LSH";
 664     case BINOP_RSH:
 665       return "BINOP_RSH";
 666     case BINOP_LOGICAL_AND:
 667       return "BINOP_LOGICAL_AND";
 668     case BINOP_LOGICAL_OR:
 669       return "BINOP_LOGICAL_OR";
 670     case BINOP_BITWISE_AND:
 671       return "BINOP_BITWISE_AND";
 672     case BINOP_BITWISE_IOR:
 673       return "BINOP_BITWISE_IOR";
 674     case BINOP_BITWISE_XOR:
 675       return "BINOP_BITWISE_XOR";
 676     case BINOP_EQUAL:
 677       return "BINOP_EQUAL";
 678     case BINOP_NOTEQUAL:
 679       return "BINOP_NOTEQUAL";
 680     case BINOP_LESS:
 681       return "BINOP_LESS";
 682     case BINOP_GTR:
 683       return "BINOP_GTR";
 684     case BINOP_LEQ:
 685       return "BINOP_LEQ";
 686     case BINOP_GEQ:
 687       return "BINOP_GEQ";
 688     case BINOP_REPEAT:
 689       return "BINOP_REPEAT";
 690     case BINOP_ASSIGN:
 691       return "BINOP_ASSIGN";
 692     case BINOP_COMMA:
 693       return "BINOP_COMMA";
 694     case BINOP_SUBSCRIPT:
 695       return "BINOP_SUBSCRIPT";
 696     case MULTI_SUBSCRIPT:
 697       return "MULTI_SUBSCRIPT";
 698     case BINOP_EXP:
 699       return "BINOP_EXP";
 700     case BINOP_MIN:
 701       return "BINOP_MIN";
 702     case BINOP_MAX:
 703       return "BINOP_MAX";
 704     case STRUCTOP_MEMBER:
 705       return "STRUCTOP_MEMBER";
 706     case STRUCTOP_MPTR:
 707       return "STRUCTOP_MPTR";
 708     case BINOP_INTDIV:
 709       return "BINOP_INTDIV";
 710     case BINOP_ASSIGN_MODIFY:
 711       return "BINOP_ASSIGN_MODIFY";
 712     case BINOP_VAL:
 713       return "BINOP_VAL";
 714     case BINOP_CONCAT:
 715       return "BINOP_CONCAT";
 716     case BINOP_RANGE:
 717       return "BINOP_RANGE";
 718     case BINOP_END:
 719       return "BINOP_END";
 720     case TERNOP_COND:
 721       return "TERNOP_COND";
 722     case TERNOP_SLICE:
 723       return "TERNOP_SLICE";
 724     case TERNOP_SLICE_COUNT:
 725       return "TERNOP_SLICE_COUNT";
 726     case OP_LONG:
 727       return "OP_LONG";
 728     case OP_DOUBLE:
 729       return "OP_DOUBLE";
 730     case OP_VAR_VALUE:
 731       return "OP_VAR_VALUE";
 732     case OP_LAST:
 733       return "OP_LAST";
 734     case OP_REGISTER:
 735       return "OP_REGISTER";
 736     case OP_INTERNALVAR:
 737       return "OP_INTERNALVAR";
 738     case OP_FUNCALL:
 739       return "OP_FUNCALL";
 740     case OP_STRING:
 741       return "OP_STRING";
 742     case OP_BITSTRING:
 743       return "OP_BITSTRING";
 744     case OP_ARRAY:
 745       return "OP_ARRAY";
 746     case UNOP_CAST:
 747       return "UNOP_CAST";
 748     case UNOP_DYNAMIC_CAST:
 749       return "UNOP_DYNAMIC_CAST";
 750     case UNOP_REINTERPRET_CAST:
 751       return "UNOP_REINTERPRET_CAST";
 752     case UNOP_MEMVAL:
 753       return "UNOP_MEMVAL";
 754     case UNOP_MEMVAL_TLS:
 755       return "UNOP_MEMVAL_TLS";
 756     case UNOP_NEG:
 757       return "UNOP_NEG";
 758     case UNOP_LOGICAL_NOT:
 759       return "UNOP_LOGICAL_NOT";
 760     case UNOP_COMPLEMENT:
 761       return "UNOP_COMPLEMENT";
 762     case UNOP_IND:
 763       return "UNOP_IND";
 764     case UNOP_ADDR:
 765       return "UNOP_ADDR";
 766     case UNOP_PREINCREMENT:
 767       return "UNOP_PREINCREMENT";
 768     case UNOP_POSTINCREMENT:
 769       return "UNOP_POSTINCREMENT";
 770     case UNOP_PREDECREMENT:
 771       return "UNOP_PREDECREMENT";
 772     case UNOP_POSTDECREMENT:
 773       return "UNOP_POSTDECREMENT";
 774     case UNOP_SIZEOF:
 775       return "UNOP_SIZEOF";
 776     case UNOP_PLUS:
 777       return "UNOP_PLUS";
 778     case UNOP_CAP:
 779       return "UNOP_CAP";
 780     case UNOP_CHR:
 781       return "UNOP_CHR";
 782     case UNOP_ORD:
 783       return "UNOP_ORD";
 784     case UNOP_ABS:
 785       return "UNOP_ABS";
 786     case UNOP_FLOAT:
 787       return "UNOP_FLOAT";
 788     case UNOP_HIGH:
 789       return "UNOP_HIGH";
 790     case UNOP_MAX:
 791       return "UNOP_MAX";
 792     case UNOP_MIN:
 793       return "UNOP_MIN";
 794     case UNOP_ODD:
 795       return "UNOP_ODD";
 796     case UNOP_TRUNC:
 797       return "UNOP_TRUNC";
 798     case OP_BOOL:
 799       return "OP_BOOL";
 800     case OP_M2_STRING:
 801       return "OP_M2_STRING";
 802     case STRUCTOP_STRUCT:
 803       return "STRUCTOP_STRUCT";
 804     case STRUCTOP_PTR:
 805       return "STRUCTOP_PTR";
 806     case OP_THIS:
 807       return "OP_THIS";
 808     case OP_OBJC_SELF:
 809       return "OP_OBJC_SELF";
 810     case OP_SCOPE:
 811       return "OP_SCOPE";
 812     case OP_TYPE:
 813       return "OP_TYPE";
 814     case OP_LABELED:
 815       return "OP_LABELED";
 816     case OP_ADL_FUNC:
 817       return "OP_ADL_FUNC";
 818     }
 819 }
 820
 821 /* Print a raw dump of expression EXP to STREAM.
 822    NOTE, if non-NULL, is printed as extra explanatory text.  */
 823
 824 void
 825 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 826                      char *note)
 827 {
 828   int elt;
 829   char *opcode_name;
 830   char *eltscan;
 831   int eltsize;
 832
 833   fprintf_filtered (stream, "Dump of expression @ ");
 834   gdb_print_host_address (exp, stream);
 835   if (note)
 836     fprintf_filtered (stream, ", %s:", note);
 837   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 838                     exp->language_defn->la_name, exp->nelts,
 839                     (long) sizeof (union exp_element));
 840   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 841                     "Hex Value", "String Value");
 842   for (elt = 0; elt < exp->nelts; elt++)
 843     {
 844       fprintf_filtered (stream, "\t%5d  ", elt);
 845       opcode_name = op_name (exp, exp->elts[elt].opcode);
 846
 847       fprintf_filtered (stream, "%20s  ", opcode_name);
 848       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 849       fprintf_filtered (stream, "  ");
 850
 851       for (eltscan = (char *) &exp->elts[elt],
 852            eltsize = sizeof (union exp_element);
 853            eltsize-- > 0;
 854            eltscan++)
 855         {
 856           fprintf_filtered (stream, "%c",
 857                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 858         }
 859       fprintf_filtered (stream, "\n");
 860     }
 861 }
 862
 863 /* Dump the subexpression of prefix expression EXP whose operator is at
 864    position ELT onto STREAM.  Returns the position of the next
 865    subexpression in EXP.  */
 866
 867 int
 868 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 869 {
 870   static int indent = 0;
 871   int i;
 872
 873   fprintf_filtered (stream, "\n");
 874   fprintf_filtered (stream, "\t%5d  ", elt);
 875
 876   for (i = 1; i <= indent; i++)
 877     fprintf_filtered (stream, " ");
 878   indent += 2;
 879
 880   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 881
 882   elt = dump_subexp_body (exp, stream, elt);
 883
 884   indent -= 2;
 885
 886   return elt;
 887 }
 888
 889 /* Dump the operands of prefix expression EXP whose opcode is at
 890    position ELT onto STREAM.  Returns the position of the next
 891    subexpression in EXP.  */
 892
 893 static int
 894 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 895 {
 896   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 897 }
 898
 899 /* Default value for subexp_body in exp_descriptor vector.  */
 900
 901 int
 902 dump_subexp_body_standard (struct expression *exp,
 903                            struct ui_file *stream, int elt)
 904 {
 905   int opcode = exp->elts[elt++].opcode;
 906
 907   switch (opcode)
 908     {
 909     case TERNOP_COND:
 910     case TERNOP_SLICE:
 911     case TERNOP_SLICE_COUNT:
 912       elt = dump_subexp (exp, stream, elt);
 913     case BINOP_ADD:
 914     case BINOP_SUB:
 915     case BINOP_MUL:
 916     case BINOP_DIV:
 917     case BINOP_REM:
 918     case BINOP_MOD:
 919     case BINOP_LSH:
 920     case BINOP_RSH:
 921     case BINOP_LOGICAL_AND:
 922     case BINOP_LOGICAL_OR:
 923     case BINOP_BITWISE_AND:
 924     case BINOP_BITWISE_IOR:
 925     case BINOP_BITWISE_XOR:
 926     case BINOP_EQUAL:
 927     case BINOP_NOTEQUAL:
 928     case BINOP_LESS:
 929     case BINOP_GTR:
 930     case BINOP_LEQ:
 931     case BINOP_GEQ:
 932     case BINOP_REPEAT:
 933     case BINOP_ASSIGN:
 934     case BINOP_COMMA:
 935     case BINOP_SUBSCRIPT:
 936     case BINOP_EXP:
 937     case BINOP_MIN:
 938     case BINOP_MAX:
 939     case BINOP_INTDIV:
 940     case BINOP_ASSIGN_MODIFY:
 941     case BINOP_VAL:
 942     case BINOP_CONCAT:
 943     case BINOP_IN:
 944     case BINOP_RANGE:
 945     case BINOP_END:
 946     case STRUCTOP_MEMBER:
 947     case STRUCTOP_MPTR:
 948       elt = dump_subexp (exp, stream, elt);
 949     case UNOP_NEG:
 950     case UNOP_LOGICAL_NOT:
 951     case UNOP_COMPLEMENT:
 952     case UNOP_IND:
 953     case UNOP_ADDR:
 954     case UNOP_PREINCREMENT:
 955     case UNOP_POSTINCREMENT:
 956     case UNOP_PREDECREMENT:
 957     case UNOP_POSTDECREMENT:
 958     case UNOP_SIZEOF:
 959     case UNOP_PLUS:
 960     case UNOP_CAP:
 961     case UNOP_CHR:
 962     case UNOP_ORD:
 963     case UNOP_ABS:
 964     case UNOP_FLOAT:
 965     case UNOP_HIGH:
 966     case UNOP_MAX:
 967     case UNOP_MIN:
 968     case UNOP_ODD:
 969     case UNOP_TRUNC:
 970       elt = dump_subexp (exp, stream, elt);
 971       break;
 972     case OP_LONG:
 973       fprintf_filtered (stream, "Type @");
 974       gdb_print_host_address (exp->elts[elt].type, stream);
 975       fprintf_filtered (stream, " (");
 976       type_print (exp->elts[elt].type, NULL, stream, 0);
 977       fprintf_filtered (stream, "), value %ld (0x%lx)",
 978                         (long) exp->elts[elt + 1].longconst,
 979                         (long) exp->elts[elt + 1].longconst);
 980       elt += 3;
 981       break;
 982     case OP_DOUBLE:
 983       fprintf_filtered (stream, "Type @");
 984       gdb_print_host_address (exp->elts[elt].type, stream);
 985       fprintf_filtered (stream, " (");
 986       type_print (exp->elts[elt].type, NULL, stream, 0);
 987       fprintf_filtered (stream, "), value %g",
 988                         (double) exp->elts[elt + 1].doubleconst);
 989       elt += 3;
 990       break;
 991     case OP_VAR_VALUE:
 992       fprintf_filtered (stream, "Block @");
 993       gdb_print_host_address (exp->elts[elt].block, stream);
 994       fprintf_filtered (stream, ", symbol @");
 995       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 996       fprintf_filtered (stream, " (%s)",
 997                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 998       elt += 3;
 999       break;
1000     case OP_LAST:
1001       fprintf_filtered (stream, "History element %ld",
1002                         (long) exp->elts[elt].longconst);
1003       elt += 2;
1004       break;
1005     case OP_REGISTER:
1006       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
1007       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
1008       break;
1009     case OP_INTERNALVAR:
1010       fprintf_filtered (stream, "Internal var @");
1011       gdb_print_host_address (exp->elts[elt].internalvar, stream);
1012       fprintf_filtered (stream, " (%s)",
1013                         internalvar_name (exp->elts[elt].internalvar));
1014       elt += 2;
1015       break;
1016     case OP_FUNCALL:
1017       {
1018         int i, nargs;
1019
1020         nargs = longest_to_int (exp->elts[elt].longconst);
1021
1022         fprintf_filtered (stream, "Number of args: %d", nargs);
1023         elt += 2;
1024
1025         for (i = 1; i <= nargs + 1; i++)
1026           elt = dump_subexp (exp, stream, elt);
1027       }
1028       break;
1029     case OP_ARRAY:
1030       {
1031         int lower, upper;
1032         int i;
1033
1034         lower = longest_to_int (exp->elts[elt].longconst);
1035         upper = longest_to_int (exp->elts[elt + 1].longconst);
1036
1037         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
1038         elt += 3;
1039
1040         for (i = 1; i <= upper - lower + 1; i++)
1041           elt = dump_subexp (exp, stream, elt);
1042       }
1043       break;
1044     case UNOP_MEMVAL:
1045     case UNOP_CAST:
1046     case UNOP_DYNAMIC_CAST:
1047     case UNOP_REINTERPRET_CAST:
1048       fprintf_filtered (stream, "Type @");
1049       gdb_print_host_address (exp->elts[elt].type, stream);
1050       fprintf_filtered (stream, " (");
1051       type_print (exp->elts[elt].type, NULL, stream, 0);
1052       fprintf_filtered (stream, ")");
1053       elt = dump_subexp (exp, stream, elt + 2);
1054       break;
1055     case UNOP_MEMVAL_TLS:
1056       fprintf_filtered (stream, "TLS type @");
1057       gdb_print_host_address (exp->elts[elt + 1].type, stream);
1058       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
1059                         (exp->elts[elt].objfile == NULL ? "(null)"
1060                          : exp->elts[elt].objfile->name));
1061       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
1062       fprintf_filtered (stream, ")");
1063       elt = dump_subexp (exp, stream, elt + 3);
1064       break;
1065     case OP_TYPE:
1066       fprintf_filtered (stream, "Type @");
1067       gdb_print_host_address (exp->elts[elt].type, stream);
1068       fprintf_filtered (stream, " (");
1069       type_print (exp->elts[elt].type, NULL, stream, 0);
1070       fprintf_filtered (stream, ")");
1071       elt += 2;
1072       break;
1073     case STRUCTOP_STRUCT:
1074     case STRUCTOP_PTR:
1075       {
1076         char *elem_name;
1077         int len;
1078
1079         len = longest_to_int (exp->elts[elt].longconst);
1080         elem_name = &exp->elts[elt + 1].string;
1081
1082         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1083         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1084       }
1085       break;
1086     case OP_SCOPE:
1087       {
1088         char *elem_name;
1089         int len;
1090
1091         fprintf_filtered (stream, "Type @");
1092         gdb_print_host_address (exp->elts[elt].type, stream);
1093         fprintf_filtered (stream, " (");
1094         type_print (exp->elts[elt].type, NULL, stream, 0);
1095         fprintf_filtered (stream, ") ");
1096
1097         len = longest_to_int (exp->elts[elt + 1].longconst);
1098         elem_name = &exp->elts[elt + 2].string;
1099
1100         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1101         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1102       }
1103       break;
1104     default:
1105     case OP_NULL:
1106     case MULTI_SUBSCRIPT:
1107     case OP_F77_UNDETERMINED_ARGLIST:
1108     case OP_COMPLEX:
1109     case OP_STRING:
1110     case OP_BITSTRING:
1111     case OP_BOOL:
1112     case OP_M2_STRING:
1113     case OP_THIS:
1114     case OP_LABELED:
1115     case OP_NAME:
1116       fprintf_filtered (stream, "Unknown format");
1117     }
1118
1119   return elt;
1120 }
1121
1122 void
1123 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1124 {
1125   int elt;
1126
1127   fprintf_filtered (stream, "Dump of expression @ ");
1128   gdb_print_host_address (exp, stream);
1129   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1130   if (exp->elts[0].opcode != OP_TYPE)
1131     print_expression (exp, stream);
1132   else
1133     fputs_filtered ("Type printing not yet supported....", stream);
1134   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1135                     exp->language_defn->la_name, exp->nelts,
1136                     (long) sizeof (union exp_element));
1137   fputs_filtered ("\n", stream);
1138
1139   for (elt = 0; elt < exp->nelts;)
1140     elt = dump_subexp (exp, stream, elt);
1141   fputs_filtered ("\n", stream);
1142 }