gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   4    1998, 1999, 2000, 2003 Free 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 2 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, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "symtab.h"
  25 #include "gdbtypes.h"
  26 #include "expression.h"
  27 #include "value.h"
  28 #include "language.h"
  29 #include "parser-defs.h"
  30 #include "user-regs.h"          /* For user_reg_map_regnum_to_name.  */
  31 #include "target.h"
  32 #include "gdb_string.h"
  33 #include "block.h"
  34
  35 #ifdef HAVE_CTYPE_H
  36 #include <ctype.h>
  37 #endif
  38
  39 void
  40 print_expression (struct expression *exp, struct ui_file *stream)
  41 {
  42   int pc = 0;
  43   print_subexp (exp, &pc, stream, PREC_NULL);
  44 }
  45
  46 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  47    PREC is the precedence of the surrounding operator;
  48    if the precedence of the main operator of this subexpression is less,
  49    parentheses are needed here.  */
  50
  51 void
  52 print_subexp (struct expression *exp, int *pos,
  53               struct ui_file *stream, enum precedence prec)
  54 {
  55   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  56 }
  57
  58 /* Standard implementation of print_subexp for use in language_defn
  59    vectors.  */
  60 void
  61 print_subexp_standard (struct expression *exp, int *pos,
  62                        struct ui_file *stream, enum precedence prec)
  63 {
  64   unsigned tem;
  65   const struct op_print *op_print_tab;
  66   int pc;
  67   unsigned nargs;
  68   char *op_str;
  69   int assign_modify = 0;
  70   enum exp_opcode opcode;
  71   enum precedence myprec = PREC_NULL;
  72   /* Set to 1 for a right-associative operator.  */
  73   int assoc = 0;
  74   struct value *val;
  75   char *tempstr = NULL;
  76
  77   op_print_tab = exp->language_defn->la_op_print_tab;
  78   pc = (*pos)++;
  79   opcode = exp->elts[pc].opcode;
  80   switch (opcode)
  81     {
  82       /* Common ops */
  83
  84     case OP_SCOPE:
  85       myprec = PREC_PREFIX;
  86       assoc = 0;
  87       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  88       fputs_filtered ("::", stream);
  89       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  90       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  91       fputs_filtered (&exp->elts[pc + 3].string, stream);
  92       return;
  93
  94     case OP_LONG:
  95       (*pos) += 3;
  96       value_print (value_from_longest (exp->elts[pc + 1].type,
  97                                        exp->elts[pc + 2].longconst),
  98                    stream, 0, Val_no_prettyprint);
  99       return;
 100
 101     case OP_DOUBLE:
 102       (*pos) += 3;
 103       value_print (value_from_double (exp->elts[pc + 1].type,
 104                                       exp->elts[pc + 2].doubleconst),
 105                    stream, 0, Val_no_prettyprint);
 106       return;
 107
 108     case OP_VAR_VALUE:
 109       {
 110         struct block *b;
 111         (*pos) += 3;
 112         b = exp->elts[pc + 1].block;
 113         if (b != NULL
 114             && BLOCK_FUNCTION (b) != NULL
 115             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 116           {
 117             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 118             fputs_filtered ("::", stream);
 119           }
 120         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 121       }
 122       return;
 123
 124     case OP_LAST:
 125       (*pos) += 2;
 126       fprintf_filtered (stream, "$%d",
 127                         longest_to_int (exp->elts[pc + 1].longconst));
 128       return;
 129
 130     case OP_REGISTER:
 131       {
 132         int regnum = longest_to_int (exp->elts[pc + 1].longconst);
 133         const char *name = user_reg_map_regnum_to_name (current_gdbarch,
 134                                                         regnum);
 135         (*pos) += 2;
 136         fprintf_filtered (stream, "$%s", name);
 137         return;
 138       }
 139
 140     case OP_BOOL:
 141       (*pos) += 2;
 142       fprintf_filtered (stream, "%s",
 143                         longest_to_int (exp->elts[pc + 1].longconst)
 144                         ? "TRUE" : "FALSE");
 145       return;
 146
 147     case OP_INTERNALVAR:
 148       (*pos) += 2;
 149       fprintf_filtered (stream, "$%s",
 150                         internalvar_name (exp->elts[pc + 1].internalvar));
 151       return;
 152
 153     case OP_FUNCALL:
 154       (*pos) += 2;
 155       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 156       print_subexp (exp, pos, stream, PREC_SUFFIX);
 157       fputs_filtered (" (", stream);
 158       for (tem = 0; tem < nargs; tem++)
 159         {
 160           if (tem != 0)
 161             fputs_filtered (", ", stream);
 162           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 163         }
 164       fputs_filtered (")", stream);
 165       return;
 166
 167     case OP_NAME:
 168     case OP_EXPRSTRING:
 169       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 170       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 171       fputs_filtered (&exp->elts[pc + 2].string, stream);
 172       return;
 173
 174     case OP_STRING:
 175       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 176       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 177       /* LA_PRINT_STRING will print using the current repeat count threshold.
 178          If necessary, we can temporarily set it to zero, or pass it as an
 179          additional parameter to LA_PRINT_STRING.  -fnf */
 180       LA_PRINT_STRING (stream, &exp->elts[pc + 2].string, nargs, 1, 0);
 181       return;
 182
 183     case OP_BITSTRING:
 184       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 185       (*pos)
 186         += 3 + BYTES_TO_EXP_ELEM ((nargs + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
 187       fprintf_unfiltered (stream, "B'<unimplemented>'");
 188       return;
 189
 190     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class NSString constant.  */
 191       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 192       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 193       fputs_filtered ("@\"", stream);
 194       LA_PRINT_STRING (stream, &exp->elts[pc + 2].string, nargs, 1, 0);
 195       fputs_filtered ("\"", stream);
 196       return;
 197
 198     case OP_OBJC_MSGCALL:
 199       {                 /* Objective C message (method) call.  */
 200         char *selector;
 201         (*pos) += 3;
 202         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 203         fprintf_unfiltered (stream, "[");
 204         print_subexp (exp, pos, stream, PREC_SUFFIX);
 205         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 206                                      &selector, 1024, NULL))
 207           {
 208             error ("bad selector");
 209             return;
 210           }
 211         if (nargs)
 212           {
 213             char *s, *nextS;
 214             s = alloca (strlen (selector) + 1);
 215             strcpy (s, selector);
 216             for (tem = 0; tem < nargs; tem++)
 217               {
 218                 nextS = strchr (s, ':');
 219                 *nextS = '\0';
 220                 fprintf_unfiltered (stream, " %s: ", s);
 221                 s = nextS + 1;
 222                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 223               }
 224           }
 225         else
 226           {
 227             fprintf_unfiltered (stream, " %s", selector);
 228           }
 229         fprintf_unfiltered (stream, "]");
 230         /* "selector" was malloc'd by target_read_string. Free it.  */
 231         xfree (selector);
 232         return;
 233       }
 234
 235     case OP_ARRAY:
 236       (*pos) += 3;
 237       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 238       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 239       nargs++;
 240       tem = 0;
 241       if (exp->elts[pc + 4].opcode == OP_LONG
 242           && exp->elts[pc + 5].type == builtin_type_char
 243           && exp->language_defn->la_language == language_c)
 244         {
 245           /* Attempt to print C character arrays using string syntax.
 246              Walk through the args, picking up one character from each
 247              of the OP_LONG expression elements.  If any array element
 248              does not match our expection of what we should find for
 249              a simple string, revert back to array printing.  Note that
 250              the last expression element is an explicit null terminator
 251              byte, which doesn't get printed. */
 252           tempstr = alloca (nargs);
 253           pc += 4;
 254           while (tem < nargs)
 255             {
 256               if (exp->elts[pc].opcode != OP_LONG
 257                   || exp->elts[pc + 1].type != builtin_type_char)
 258                 {
 259                   /* Not a simple array of char, use regular array printing. */
 260                   tem = 0;
 261                   break;
 262                 }
 263               else
 264                 {
 265                   tempstr[tem++] =
 266                     longest_to_int (exp->elts[pc + 2].longconst);
 267                   pc += 4;
 268                 }
 269             }
 270         }
 271       if (tem > 0)
 272         {
 273           LA_PRINT_STRING (stream, tempstr, nargs - 1, 1, 0);
 274           (*pos) = pc;
 275         }
 276       else
 277         {
 278           fputs_filtered (" {", stream);
 279           for (tem = 0; tem < nargs; tem++)
 280             {
 281               if (tem != 0)
 282                 {
 283                   fputs_filtered (", ", stream);
 284                 }
 285               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 286             }
 287           fputs_filtered ("}", stream);
 288         }
 289       return;
 290
 291     case OP_LABELED:
 292       tem = longest_to_int (exp->elts[pc + 1].longconst);
 293       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 294       /* Gcc support both these syntaxes.  Unsure which is preferred.  */
 295 #if 1
 296       fputs_filtered (&exp->elts[pc + 2].string, stream);
 297       fputs_filtered (": ", stream);
 298 #else
 299       fputs_filtered (".", stream);
 300       fputs_filtered (&exp->elts[pc + 2].string, stream);
 301       fputs_filtered ("=", stream);
 302 #endif
 303       print_subexp (exp, pos, stream, PREC_SUFFIX);
 304       return;
 305
 306     case TERNOP_COND:
 307       if ((int) prec > (int) PREC_COMMA)
 308         fputs_filtered ("(", stream);
 309       /* Print the subexpressions, forcing parentheses
 310          around any binary operations within them.
 311          This is more parentheses than are strictly necessary,
 312          but it looks clearer.  */
 313       print_subexp (exp, pos, stream, PREC_HYPER);
 314       fputs_filtered (" ? ", stream);
 315       print_subexp (exp, pos, stream, PREC_HYPER);
 316       fputs_filtered (" : ", stream);
 317       print_subexp (exp, pos, stream, PREC_HYPER);
 318       if ((int) prec > (int) PREC_COMMA)
 319         fputs_filtered (")", stream);
 320       return;
 321
 322     case TERNOP_SLICE:
 323     case TERNOP_SLICE_COUNT:
 324       print_subexp (exp, pos, stream, PREC_SUFFIX);
 325       fputs_filtered ("(", stream);
 326       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 327       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 328       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 329       fputs_filtered (")", stream);
 330       return;
 331
 332     case STRUCTOP_STRUCT:
 333       tem = longest_to_int (exp->elts[pc + 1].longconst);
 334       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 335       print_subexp (exp, pos, stream, PREC_SUFFIX);
 336       fputs_filtered (".", stream);
 337       fputs_filtered (&exp->elts[pc + 2].string, stream);
 338       return;
 339
 340       /* Will not occur for Modula-2 */
 341     case STRUCTOP_PTR:
 342       tem = longest_to_int (exp->elts[pc + 1].longconst);
 343       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 344       print_subexp (exp, pos, stream, PREC_SUFFIX);
 345       fputs_filtered ("->", stream);
 346       fputs_filtered (&exp->elts[pc + 2].string, stream);
 347       return;
 348
 349     case BINOP_SUBSCRIPT:
 350       print_subexp (exp, pos, stream, PREC_SUFFIX);
 351       fputs_filtered ("[", stream);
 352       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 353       fputs_filtered ("]", stream);
 354       return;
 355
 356     case UNOP_POSTINCREMENT:
 357       print_subexp (exp, pos, stream, PREC_SUFFIX);
 358       fputs_filtered ("++", stream);
 359       return;
 360
 361     case UNOP_POSTDECREMENT:
 362       print_subexp (exp, pos, stream, PREC_SUFFIX);
 363       fputs_filtered ("--", stream);
 364       return;
 365
 366     case UNOP_CAST:
 367       (*pos) += 2;
 368       if ((int) prec > (int) PREC_PREFIX)
 369         fputs_filtered ("(", stream);
 370       fputs_filtered ("(", stream);
 371       type_print (exp->elts[pc + 1].type, "", stream, 0);
 372       fputs_filtered (") ", stream);
 373       print_subexp (exp, pos, stream, PREC_PREFIX);
 374       if ((int) prec > (int) PREC_PREFIX)
 375         fputs_filtered (")", stream);
 376       return;
 377
 378     case UNOP_MEMVAL:
 379       (*pos) += 2;
 380       if ((int) prec > (int) PREC_PREFIX)
 381         fputs_filtered ("(", stream);
 382       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC &&
 383           exp->elts[pc + 3].opcode == OP_LONG)
 384         {
 385           /* We have a minimal symbol fn, probably.  It's encoded
 386              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 387              Swallow the OP_LONG (including both its opcodes); ignore
 388              its type; print the value in the type of the MEMVAL.  */
 389           (*pos) += 4;
 390           val = value_at_lazy (exp->elts[pc + 1].type,
 391                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 392           value_print (val, stream, 0, Val_no_prettyprint);
 393         }
 394       else
 395         {
 396           fputs_filtered ("{", stream);
 397           type_print (exp->elts[pc + 1].type, "", stream, 0);
 398           fputs_filtered ("} ", stream);
 399           print_subexp (exp, pos, stream, PREC_PREFIX);
 400         }
 401       if ((int) prec > (int) PREC_PREFIX)
 402         fputs_filtered (")", stream);
 403       return;
 404
 405     case BINOP_ASSIGN_MODIFY:
 406       opcode = exp->elts[pc + 1].opcode;
 407       (*pos) += 2;
 408       myprec = PREC_ASSIGN;
 409       assoc = 1;
 410       assign_modify = 1;
 411       op_str = "???";
 412       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 413         if (op_print_tab[tem].opcode == opcode)
 414           {
 415             op_str = op_print_tab[tem].string;
 416             break;
 417           }
 418       if (op_print_tab[tem].opcode != opcode)
 419         /* Not found; don't try to keep going because we don't know how
 420            to interpret further elements.  */
 421         error ("Invalid expression");
 422       break;
 423
 424       /* C++ ops */
 425
 426     case OP_THIS:
 427       ++(*pos);
 428       fputs_filtered ("this", stream);
 429       return;
 430
 431       /* Objective-C ops */
 432
 433     case OP_OBJC_SELF:
 434       ++(*pos);
 435       fputs_filtered ("self", stream);  /* The ObjC equivalent of "this".  */
 436       return;
 437
 438       /* Modula-2 ops */
 439
 440     case MULTI_SUBSCRIPT:
 441       (*pos) += 2;
 442       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 443       print_subexp (exp, pos, stream, PREC_SUFFIX);
 444       fprintf_unfiltered (stream, " [");
 445       for (tem = 0; tem < nargs; tem++)
 446         {
 447           if (tem != 0)
 448             fprintf_unfiltered (stream, ", ");
 449           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 450         }
 451       fprintf_unfiltered (stream, "]");
 452       return;
 453
 454     case BINOP_VAL:
 455       (*pos) += 2;
 456       fprintf_unfiltered (stream, "VAL(");
 457       type_print (exp->elts[pc + 1].type, "", stream, 0);
 458       fprintf_unfiltered (stream, ",");
 459       print_subexp (exp, pos, stream, PREC_PREFIX);
 460       fprintf_unfiltered (stream, ")");
 461       return;
 462
 463     case BINOP_INCL:
 464     case BINOP_EXCL:
 465       error ("print_subexp:  Not implemented.");
 466
 467       /* Default ops */
 468
 469     default:
 470       op_str = "???";
 471       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 472         if (op_print_tab[tem].opcode == opcode)
 473           {
 474             op_str = op_print_tab[tem].string;
 475             myprec = op_print_tab[tem].precedence;
 476             assoc = op_print_tab[tem].right_assoc;
 477             break;
 478           }
 479       if (op_print_tab[tem].opcode != opcode)
 480         /* Not found; don't try to keep going because we don't know how
 481            to interpret further elements.  For example, this happens
 482            if opcode is OP_TYPE.  */
 483         error ("Invalid expression");
 484     }
 485
 486   /* Note that PREC_BUILTIN will always emit parentheses. */
 487   if ((int) myprec < (int) prec)
 488     fputs_filtered ("(", stream);
 489   if ((int) opcode > (int) BINOP_END)
 490     {
 491       if (assoc)
 492         {
 493           /* Unary postfix operator.  */
 494           print_subexp (exp, pos, stream, PREC_SUFFIX);
 495           fputs_filtered (op_str, stream);
 496         }
 497       else
 498         {
 499           /* Unary prefix operator.  */
 500           fputs_filtered (op_str, stream);
 501           if (myprec == PREC_BUILTIN_FUNCTION)
 502             fputs_filtered ("(", stream);
 503           print_subexp (exp, pos, stream, PREC_PREFIX);
 504           if (myprec == PREC_BUILTIN_FUNCTION)
 505             fputs_filtered (")", stream);
 506         }
 507     }
 508   else
 509     {
 510       /* Binary operator.  */
 511       /* Print left operand.
 512          If operator is right-associative,
 513          increment precedence for this operand.  */
 514       print_subexp (exp, pos, stream,
 515                     (enum precedence) ((int) myprec + assoc));
 516       /* Print the operator itself.  */
 517       if (assign_modify)
 518         fprintf_filtered (stream, " %s= ", op_str);
 519       else if (op_str[0] == ',')
 520         fprintf_filtered (stream, "%s ", op_str);
 521       else
 522         fprintf_filtered (stream, " %s ", op_str);
 523       /* Print right operand.
 524          If operator is left-associative,
 525          increment precedence for this operand.  */
 526       print_subexp (exp, pos, stream,
 527                     (enum precedence) ((int) myprec + !assoc));
 528     }
 529
 530   if ((int) myprec < (int) prec)
 531     fputs_filtered (")", stream);
 532 }
 533
 534 /* Return the operator corresponding to opcode OP as
 535    a string.   NULL indicates that the opcode was not found in the
 536    current language table.  */
 537 char *
 538 op_string (enum exp_opcode op)
 539 {
 540   int tem;
 541   const struct op_print *op_print_tab;
 542
 543   op_print_tab = current_language->la_op_print_tab;
 544   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 545     if (op_print_tab[tem].opcode == op)
 546       return op_print_tab[tem].string;
 547   return NULL;
 548 }
 549
 550 /* Support for dumping the raw data from expressions in a human readable
 551    form.  */
 552
 553 static char *op_name (struct expression *, enum exp_opcode);
 554 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 555
 556 /* Name for OPCODE, when it appears in expression EXP. */
 557
 558 static char *
 559 op_name (struct expression *exp, enum exp_opcode opcode)
 560 {
 561   return exp->language_defn->la_exp_desc->op_name (opcode);
 562 }
 563
 564 /* Default name for the standard operator OPCODE (i.e., one defined in
 565    the definition of enum exp_opcode).  */
 566
 567 char *
 568 op_name_standard (enum exp_opcode opcode)
 569 {
 570   switch (opcode)
 571     {
 572     default:
 573       {
 574         static char buf[30];
 575
 576         sprintf (buf, "<unknown %d>", opcode);
 577         return buf;
 578       }
 579     case OP_NULL:
 580       return "OP_NULL";
 581     case BINOP_ADD:
 582       return "BINOP_ADD";
 583     case BINOP_SUB:
 584       return "BINOP_SUB";
 585     case BINOP_MUL:
 586       return "BINOP_MUL";
 587     case BINOP_DIV:
 588       return "BINOP_DIV";
 589     case BINOP_REM:
 590       return "BINOP_REM";
 591     case BINOP_MOD:
 592       return "BINOP_MOD";
 593     case BINOP_LSH:
 594       return "BINOP_LSH";
 595     case BINOP_RSH:
 596       return "BINOP_RSH";
 597     case BINOP_LOGICAL_AND:
 598       return "BINOP_LOGICAL_AND";
 599     case BINOP_LOGICAL_OR:
 600       return "BINOP_LOGICAL_OR";
 601     case BINOP_BITWISE_AND:
 602       return "BINOP_BITWISE_AND";
 603     case BINOP_BITWISE_IOR:
 604       return "BINOP_BITWISE_IOR";
 605     case BINOP_BITWISE_XOR:
 606       return "BINOP_BITWISE_XOR";
 607     case BINOP_EQUAL:
 608       return "BINOP_EQUAL";
 609     case BINOP_NOTEQUAL:
 610       return "BINOP_NOTEQUAL";
 611     case BINOP_LESS:
 612       return "BINOP_LESS";
 613     case BINOP_GTR:
 614       return "BINOP_GTR";
 615     case BINOP_LEQ:
 616       return "BINOP_LEQ";
 617     case BINOP_GEQ:
 618       return "BINOP_GEQ";
 619     case BINOP_REPEAT:
 620       return "BINOP_REPEAT";
 621     case BINOP_ASSIGN:
 622       return "BINOP_ASSIGN";
 623     case BINOP_COMMA:
 624       return "BINOP_COMMA";
 625     case BINOP_SUBSCRIPT:
 626       return "BINOP_SUBSCRIPT";
 627     case MULTI_SUBSCRIPT:
 628       return "MULTI_SUBSCRIPT";
 629     case BINOP_EXP:
 630       return "BINOP_EXP";
 631     case BINOP_MIN:
 632       return "BINOP_MIN";
 633     case BINOP_MAX:
 634       return "BINOP_MAX";
 635     case STRUCTOP_MEMBER:
 636       return "STRUCTOP_MEMBER";
 637     case STRUCTOP_MPTR:
 638       return "STRUCTOP_MPTR";
 639     case BINOP_INTDIV:
 640       return "BINOP_INTDIV";
 641     case BINOP_ASSIGN_MODIFY:
 642       return "BINOP_ASSIGN_MODIFY";
 643     case BINOP_VAL:
 644       return "BINOP_VAL";
 645     case BINOP_INCL:
 646       return "BINOP_INCL";
 647     case BINOP_EXCL:
 648       return "BINOP_EXCL";
 649     case BINOP_CONCAT:
 650       return "BINOP_CONCAT";
 651     case BINOP_RANGE:
 652       return "BINOP_RANGE";
 653     case BINOP_END:
 654       return "BINOP_END";
 655     case TERNOP_COND:
 656       return "TERNOP_COND";
 657     case TERNOP_SLICE:
 658       return "TERNOP_SLICE";
 659     case TERNOP_SLICE_COUNT:
 660       return "TERNOP_SLICE_COUNT";
 661     case OP_LONG:
 662       return "OP_LONG";
 663     case OP_DOUBLE:
 664       return "OP_DOUBLE";
 665     case OP_VAR_VALUE:
 666       return "OP_VAR_VALUE";
 667     case OP_LAST:
 668       return "OP_LAST";
 669     case OP_REGISTER:
 670       return "OP_REGISTER";
 671     case OP_INTERNALVAR:
 672       return "OP_INTERNALVAR";
 673     case OP_FUNCALL:
 674       return "OP_FUNCALL";
 675     case OP_STRING:
 676       return "OP_STRING";
 677     case OP_BITSTRING:
 678       return "OP_BITSTRING";
 679     case OP_ARRAY:
 680       return "OP_ARRAY";
 681     case UNOP_CAST:
 682       return "UNOP_CAST";
 683     case UNOP_MEMVAL:
 684       return "UNOP_MEMVAL";
 685     case UNOP_NEG:
 686       return "UNOP_NEG";
 687     case UNOP_LOGICAL_NOT:
 688       return "UNOP_LOGICAL_NOT";
 689     case UNOP_COMPLEMENT:
 690       return "UNOP_COMPLEMENT";
 691     case UNOP_IND:
 692       return "UNOP_IND";
 693     case UNOP_ADDR:
 694       return "UNOP_ADDR";
 695     case UNOP_PREINCREMENT:
 696       return "UNOP_PREINCREMENT";
 697     case UNOP_POSTINCREMENT:
 698       return "UNOP_POSTINCREMENT";
 699     case UNOP_PREDECREMENT:
 700       return "UNOP_PREDECREMENT";
 701     case UNOP_POSTDECREMENT:
 702       return "UNOP_POSTDECREMENT";
 703     case UNOP_SIZEOF:
 704       return "UNOP_SIZEOF";
 705     case UNOP_LOWER:
 706       return "UNOP_LOWER";
 707     case UNOP_UPPER:
 708       return "UNOP_UPPER";
 709     case UNOP_LENGTH:
 710       return "UNOP_LENGTH";
 711     case UNOP_PLUS:
 712       return "UNOP_PLUS";
 713     case UNOP_CAP:
 714       return "UNOP_CAP";
 715     case UNOP_CHR:
 716       return "UNOP_CHR";
 717     case UNOP_ORD:
 718       return "UNOP_ORD";
 719     case UNOP_ABS:
 720       return "UNOP_ABS";
 721     case UNOP_FLOAT:
 722       return "UNOP_FLOAT";
 723     case UNOP_HIGH:
 724       return "UNOP_HIGH";
 725     case UNOP_MAX:
 726       return "UNOP_MAX";
 727     case UNOP_MIN:
 728       return "UNOP_MIN";
 729     case UNOP_ODD:
 730       return "UNOP_ODD";
 731     case UNOP_TRUNC:
 732       return "UNOP_TRUNC";
 733     case OP_BOOL:
 734       return "OP_BOOL";
 735     case OP_M2_STRING:
 736       return "OP_M2_STRING";
 737     case STRUCTOP_STRUCT:
 738       return "STRUCTOP_STRUCT";
 739     case STRUCTOP_PTR:
 740       return "STRUCTOP_PTR";
 741     case OP_THIS:
 742       return "OP_THIS";
 743     case OP_OBJC_SELF:
 744       return "OP_OBJC_SELF";
 745     case OP_SCOPE:
 746       return "OP_SCOPE";
 747     case OP_TYPE:
 748       return "OP_TYPE";
 749     case OP_LABELED:
 750       return "OP_LABELED";
 751     }
 752 }
 753
 754 void
 755 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 756                      char *note)
 757 {
 758   int elt;
 759   char *opcode_name;
 760   char *eltscan;
 761   int eltsize;
 762
 763   fprintf_filtered (stream, "Dump of expression @ ");
 764   gdb_print_host_address (exp, stream);
 765   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
 766                     exp->language_defn->la_name, exp->nelts,
 767                     (long) sizeof (union exp_element));
 768   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 769                     "Hex Value", "String Value");
 770   for (elt = 0; elt < exp->nelts; elt++)
 771     {
 772       fprintf_filtered (stream, "\t%5d  ", elt);
 773       opcode_name = op_name (exp, exp->elts[elt].opcode);
 774
 775       fprintf_filtered (stream, "%20s  ", opcode_name);
 776       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 777       fprintf_filtered (stream, "  ");
 778
 779       for (eltscan = (char *) &exp->elts[elt],
 780            eltsize = sizeof (union exp_element);
 781            eltsize-- > 0;
 782            eltscan++)
 783         {
 784           fprintf_filtered (stream, "%c",
 785                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 786         }
 787       fprintf_filtered (stream, "\n");
 788     }
 789 }
 790
 791 /* Dump the subexpression of prefix expression EXP whose operator is at
 792    position ELT onto STREAM.  Returns the position of the next
 793    subexpression in EXP.  */
 794
 795 int
 796 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 797 {
 798   static int indent = 0;
 799   int i;
 800
 801   fprintf_filtered (stream, "\n");
 802   fprintf_filtered (stream, "\t%5d  ", elt);
 803
 804   for (i = 1; i <= indent; i++)
 805     fprintf_filtered (stream, " ");
 806   indent += 2;
 807
 808   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 809
 810   elt = dump_subexp_body (exp, stream, elt);
 811
 812   indent -= 2;
 813
 814   return elt;
 815 }
 816
 817 /* Dump the operands of prefix expression EXP whose opcode is at
 818    position ELT onto STREAM.  Returns the position of the next
 819    subexpression in EXP.  */
 820
 821 static int
 822 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 823 {
 824   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 825 }
 826
 827 /* Default value for subexp_body in exp_descriptor vector.  */
 828
 829 int
 830 dump_subexp_body_standard (struct expression *exp,
 831                            struct ui_file *stream, int elt)
 832 {
 833   int opcode = exp->elts[elt++].opcode;
 834
 835   switch (opcode)
 836     {
 837     case TERNOP_COND:
 838     case TERNOP_SLICE:
 839     case TERNOP_SLICE_COUNT:
 840       elt = dump_subexp (exp, stream, elt);
 841     case BINOP_ADD:
 842     case BINOP_SUB:
 843     case BINOP_MUL:
 844     case BINOP_DIV:
 845     case BINOP_REM:
 846     case BINOP_MOD:
 847     case BINOP_LSH:
 848     case BINOP_RSH:
 849     case BINOP_LOGICAL_AND:
 850     case BINOP_LOGICAL_OR:
 851     case BINOP_BITWISE_AND:
 852     case BINOP_BITWISE_IOR:
 853     case BINOP_BITWISE_XOR:
 854     case BINOP_EQUAL:
 855     case BINOP_NOTEQUAL:
 856     case BINOP_LESS:
 857     case BINOP_GTR:
 858     case BINOP_LEQ:
 859     case BINOP_GEQ:
 860     case BINOP_REPEAT:
 861     case BINOP_ASSIGN:
 862     case BINOP_COMMA:
 863     case BINOP_SUBSCRIPT:
 864     case BINOP_EXP:
 865     case BINOP_MIN:
 866     case BINOP_MAX:
 867     case BINOP_INTDIV:
 868     case BINOP_ASSIGN_MODIFY:
 869     case BINOP_VAL:
 870     case BINOP_INCL:
 871     case BINOP_EXCL:
 872     case BINOP_CONCAT:
 873     case BINOP_IN:
 874     case BINOP_RANGE:
 875     case BINOP_END:
 876       elt = dump_subexp (exp, stream, elt);
 877     case UNOP_NEG:
 878     case UNOP_LOGICAL_NOT:
 879     case UNOP_COMPLEMENT:
 880     case UNOP_IND:
 881     case UNOP_ADDR:
 882     case UNOP_PREINCREMENT:
 883     case UNOP_POSTINCREMENT:
 884     case UNOP_PREDECREMENT:
 885     case UNOP_POSTDECREMENT:
 886     case UNOP_SIZEOF:
 887     case UNOP_PLUS:
 888     case UNOP_CAP:
 889     case UNOP_CHR:
 890     case UNOP_ORD:
 891     case UNOP_ABS:
 892     case UNOP_FLOAT:
 893     case UNOP_HIGH:
 894     case UNOP_MAX:
 895     case UNOP_MIN:
 896     case UNOP_ODD:
 897     case UNOP_TRUNC:
 898     case UNOP_LOWER:
 899     case UNOP_UPPER:
 900     case UNOP_LENGTH:
 901     case UNOP_CARD:
 902     case UNOP_CHMAX:
 903     case UNOP_CHMIN:
 904       elt = dump_subexp (exp, stream, elt);
 905       break;
 906     case OP_LONG:
 907       fprintf_filtered (stream, "Type @");
 908       gdb_print_host_address (exp->elts[elt].type, stream);
 909       fprintf_filtered (stream, " (");
 910       type_print (exp->elts[elt].type, NULL, stream, 0);
 911       fprintf_filtered (stream, "), value %ld (0x%lx)",
 912                         (long) exp->elts[elt + 1].longconst,
 913                         (long) exp->elts[elt + 1].longconst);
 914       elt += 3;
 915       break;
 916     case OP_DOUBLE:
 917       fprintf_filtered (stream, "Type @");
 918       gdb_print_host_address (exp->elts[elt].type, stream);
 919       fprintf_filtered (stream, " (");
 920       type_print (exp->elts[elt].type, NULL, stream, 0);
 921       fprintf_filtered (stream, "), value %g",
 922                         (double) exp->elts[elt + 1].doubleconst);
 923       elt += 3;
 924       break;
 925     case OP_VAR_VALUE:
 926       fprintf_filtered (stream, "Block @");
 927       gdb_print_host_address (exp->elts[elt].block, stream);
 928       fprintf_filtered (stream, ", symbol @");
 929       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 930       fprintf_filtered (stream, " (%s)",
 931                         DEPRECATED_SYMBOL_NAME (exp->elts[elt + 1].symbol));
 932       elt += 3;
 933       break;
 934     case OP_LAST:
 935       fprintf_filtered (stream, "History element %ld",
 936                         (long) exp->elts[elt].longconst);
 937       elt += 2;
 938       break;
 939     case OP_REGISTER:
 940       fprintf_filtered (stream, "Register %ld",
 941                         (long) exp->elts[elt].longconst);
 942       elt += 2;
 943       break;
 944     case OP_INTERNALVAR:
 945       fprintf_filtered (stream, "Internal var @");
 946       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 947       fprintf_filtered (stream, " (%s)",
 948                         exp->elts[elt].internalvar->name);
 949       elt += 2;
 950       break;
 951     case OP_FUNCALL:
 952       {
 953         int i, nargs;
 954
 955         nargs = longest_to_int (exp->elts[elt].longconst);
 956
 957         fprintf_filtered (stream, "Number of args: %d", nargs);
 958         elt += 2;
 959
 960         for (i = 1; i <= nargs + 1; i++)
 961           elt = dump_subexp (exp, stream, elt);
 962       }
 963       break;
 964     case OP_ARRAY:
 965       {
 966         int lower, upper;
 967         int i;
 968
 969         lower = longest_to_int (exp->elts[elt].longconst);
 970         upper = longest_to_int (exp->elts[elt + 1].longconst);
 971
 972         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 973         elt += 3;
 974
 975         for (i = 1; i <= upper - lower + 1; i++)
 976           elt = dump_subexp (exp, stream, elt);
 977       }
 978       break;
 979     case UNOP_MEMVAL:
 980     case UNOP_CAST:
 981       fprintf_filtered (stream, "Type @");
 982       gdb_print_host_address (exp->elts[elt].type, stream);
 983       fprintf_filtered (stream, " (");
 984       type_print (exp->elts[elt].type, NULL, stream, 0);
 985       fprintf_filtered (stream, ")");
 986       elt = dump_subexp (exp, stream, elt + 2);
 987       break;
 988     case OP_TYPE:
 989       fprintf_filtered (stream, "Type @");
 990       gdb_print_host_address (exp->elts[elt].type, stream);
 991       fprintf_filtered (stream, " (");
 992       type_print (exp->elts[elt].type, NULL, stream, 0);
 993       fprintf_filtered (stream, ")");
 994       elt += 2;
 995       break;
 996     case STRUCTOP_STRUCT:
 997     case STRUCTOP_PTR:
 998       {
 999         char *elem_name;
1000         int len;
1001
1002         len = longest_to_int (exp->elts[elt].longconst);
1003         elem_name = &exp->elts[elt + 1].string;
1004
1005         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1006         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1007       }
1008       break;
1009     case OP_SCOPE:
1010       {
1011         char *elem_name;
1012         int len;
1013
1014         fprintf_filtered (stream, "Type @");
1015         gdb_print_host_address (exp->elts[elt].type, stream);
1016         fprintf_filtered (stream, " (");
1017         type_print (exp->elts[elt].type, NULL, stream, 0);
1018         fprintf_filtered (stream, ") ");
1019
1020         len = longest_to_int (exp->elts[elt + 1].longconst);
1021         elem_name = &exp->elts[elt + 2].string;
1022
1023         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1024         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1025       }
1026       break;
1027     default:
1028     case OP_NULL:
1029     case STRUCTOP_MEMBER:
1030     case STRUCTOP_MPTR:
1031     case MULTI_SUBSCRIPT:
1032     case OP_F77_UNDETERMINED_ARGLIST:
1033     case OP_COMPLEX:
1034     case OP_STRING:
1035     case OP_BITSTRING:
1036     case OP_BOOL:
1037     case OP_M2_STRING:
1038     case OP_THIS:
1039     case OP_LABELED:
1040     case OP_NAME:
1041     case OP_EXPRSTRING:
1042       fprintf_filtered (stream, "Unknown format");
1043     }
1044
1045   return elt;
1046 }
1047
1048 void
1049 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1050 {
1051   int elt;
1052
1053   fprintf_filtered (stream, "Dump of expression @ ");
1054   gdb_print_host_address (exp, stream);
1055   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1056   if (exp->elts[0].opcode != OP_TYPE)
1057     print_expression (exp, stream);
1058   else
1059     fputs_filtered ("Type printing not yet supported....", stream);
1060   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1061                     exp->language_defn->la_name, exp->nelts,
1062                     (long) sizeof (union exp_element));
1063   fputs_filtered ("\n", stream);
1064
1065   for (elt = 0; elt < exp->nelts;)
1066     elt = dump_subexp (exp, stream, elt);
1067   fputs_filtered ("\n", stream);
1068 }