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
 290                      printing.  */
 291                   tem = 0;
 292                   break;
 293                 }
 294               else
 295                 {
 296                   tempstr[tem++] =
 297                     longest_to_int (exp->elts[pc + 2].longconst);
 298                   pc += 4;
 299                 }
 300             }
 301         }
 302       if (tem > 0)
 303         {
 304           struct value_print_options opts;
 305
 306           get_user_print_options (&opts);
 307           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 308                            tempstr, nargs - 1, NULL, 0, &opts);
 309           (*pos) = pc;
 310         }
 311       else
 312         {
 313           fputs_filtered (" {", stream);
 314           for (tem = 0; tem < nargs; tem++)
 315             {
 316               if (tem != 0)
 317                 {
 318                   fputs_filtered (", ", stream);
 319                 }
 320               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 321             }
 322           fputs_filtered ("}", stream);
 323         }
 324       return;
 325
 326     case OP_LABELED:
 327       tem = longest_to_int (exp->elts[pc + 1].longconst);
 328       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 329       /* Gcc support both these syntaxes.  Unsure which is preferred.  */
 330 #if 1
 331       fputs_filtered (&exp->elts[pc + 2].string, stream);
 332       fputs_filtered (": ", stream);
 333 #else
 334       fputs_filtered (".", stream);
 335       fputs_filtered (&exp->elts[pc + 2].string, stream);
 336       fputs_filtered ("=", stream);
 337 #endif
 338       print_subexp (exp, pos, stream, PREC_SUFFIX);
 339       return;
 340
 341     case TERNOP_COND:
 342       if ((int) prec > (int) PREC_COMMA)
 343         fputs_filtered ("(", stream);
 344       /* Print the subexpressions, forcing parentheses
 345          around any binary operations within them.
 346          This is more parentheses than are strictly necessary,
 347          but it looks clearer.  */
 348       print_subexp (exp, pos, stream, PREC_HYPER);
 349       fputs_filtered (" ? ", stream);
 350       print_subexp (exp, pos, stream, PREC_HYPER);
 351       fputs_filtered (" : ", stream);
 352       print_subexp (exp, pos, stream, PREC_HYPER);
 353       if ((int) prec > (int) PREC_COMMA)
 354         fputs_filtered (")", stream);
 355       return;
 356
 357     case TERNOP_SLICE:
 358     case TERNOP_SLICE_COUNT:
 359       print_subexp (exp, pos, stream, PREC_SUFFIX);
 360       fputs_filtered ("(", stream);
 361       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 362       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 363       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 364       fputs_filtered (")", stream);
 365       return;
 366
 367     case STRUCTOP_STRUCT:
 368       tem = longest_to_int (exp->elts[pc + 1].longconst);
 369       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 370       print_subexp (exp, pos, stream, PREC_SUFFIX);
 371       fputs_filtered (".", stream);
 372       fputs_filtered (&exp->elts[pc + 2].string, stream);
 373       return;
 374
 375       /* Will not occur for Modula-2.  */
 376     case STRUCTOP_PTR:
 377       tem = longest_to_int (exp->elts[pc + 1].longconst);
 378       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 379       print_subexp (exp, pos, stream, PREC_SUFFIX);
 380       fputs_filtered ("->", stream);
 381       fputs_filtered (&exp->elts[pc + 2].string, stream);
 382       return;
 383
 384     case STRUCTOP_MEMBER:
 385       print_subexp (exp, pos, stream, PREC_SUFFIX);
 386       fputs_filtered (".*", stream);
 387       print_subexp (exp, pos, stream, PREC_SUFFIX);
 388       return;
 389
 390     case STRUCTOP_MPTR:
 391       print_subexp (exp, pos, stream, PREC_SUFFIX);
 392       fputs_filtered ("->*", stream);
 393       print_subexp (exp, pos, stream, PREC_SUFFIX);
 394       return;
 395
 396     case BINOP_SUBSCRIPT:
 397       print_subexp (exp, pos, stream, PREC_SUFFIX);
 398       fputs_filtered ("[", stream);
 399       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 400       fputs_filtered ("]", stream);
 401       return;
 402
 403     case UNOP_POSTINCREMENT:
 404       print_subexp (exp, pos, stream, PREC_SUFFIX);
 405       fputs_filtered ("++", stream);
 406       return;
 407
 408     case UNOP_POSTDECREMENT:
 409       print_subexp (exp, pos, stream, PREC_SUFFIX);
 410       fputs_filtered ("--", stream);
 411       return;
 412
 413     case UNOP_CAST:
 414       (*pos) += 2;
 415       if ((int) prec > (int) PREC_PREFIX)
 416         fputs_filtered ("(", stream);
 417       fputs_filtered ("(", stream);
 418       type_print (exp->elts[pc + 1].type, "", stream, 0);
 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       (*pos) += 2;
 431       type_print (exp->elts[pc + 1].type, "", stream, 0);
 432       fputs_filtered ("> (", stream);
 433       print_subexp (exp, pos, stream, PREC_PREFIX);
 434       fputs_filtered (")", stream);
 435       return;
 436
 437     case UNOP_MEMVAL:
 438       (*pos) += 2;
 439       if ((int) prec > (int) PREC_PREFIX)
 440         fputs_filtered ("(", stream);
 441       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 442           && exp->elts[pc + 3].opcode == OP_LONG)
 443         {
 444           struct value_print_options opts;
 445
 446           /* We have a minimal symbol fn, probably.  It's encoded
 447              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 448              Swallow the OP_LONG (including both its opcodes); ignore
 449              its type; print the value in the type of the MEMVAL.  */
 450           (*pos) += 4;
 451           val = value_at_lazy (exp->elts[pc + 1].type,
 452                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 453           get_raw_print_options (&opts);
 454           value_print (val, stream, &opts);
 455         }
 456       else
 457         {
 458           fputs_filtered ("{", stream);
 459           type_print (exp->elts[pc + 1].type, "", stream, 0);
 460           fputs_filtered ("} ", stream);
 461           print_subexp (exp, pos, stream, PREC_PREFIX);
 462         }
 463       if ((int) prec > (int) PREC_PREFIX)
 464         fputs_filtered (")", stream);
 465       return;
 466
 467     case UNOP_MEMVAL_TLS:
 468       (*pos) += 3;
 469       if ((int) prec > (int) PREC_PREFIX)
 470         fputs_filtered ("(", stream);
 471       fputs_filtered ("{", stream);
 472       type_print (exp->elts[pc + 2].type, "", stream, 0);
 473       fputs_filtered ("} ", stream);
 474       print_subexp (exp, pos, stream, PREC_PREFIX);
 475       if ((int) prec > (int) PREC_PREFIX)
 476         fputs_filtered (")", stream);
 477       return;
 478
 479     case BINOP_ASSIGN_MODIFY:
 480       opcode = exp->elts[pc + 1].opcode;
 481       (*pos) += 2;
 482       myprec = PREC_ASSIGN;
 483       assoc = 1;
 484       assign_modify = 1;
 485       op_str = "???";
 486       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 487         if (op_print_tab[tem].opcode == opcode)
 488           {
 489             op_str = op_print_tab[tem].string;
 490             break;
 491           }
 492       if (op_print_tab[tem].opcode != opcode)
 493         /* Not found; don't try to keep going because we don't know how
 494            to interpret further elements.  */
 495         error (_("Invalid expression"));
 496       break;
 497
 498       /* C++ ops */
 499
 500     case OP_THIS:
 501       ++(*pos);
 502       fputs_filtered ("this", stream);
 503       return;
 504
 505       /* Objective-C ops */
 506
 507     case OP_OBJC_SELF:
 508       ++(*pos);
 509       fputs_filtered ("self", stream);  /* The ObjC equivalent of "this".  */
 510       return;
 511
 512       /* Modula-2 ops */
 513
 514     case MULTI_SUBSCRIPT:
 515       (*pos) += 2;
 516       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 517       print_subexp (exp, pos, stream, PREC_SUFFIX);
 518       fprintf_unfiltered (stream, " [");
 519       for (tem = 0; tem < nargs; tem++)
 520         {
 521           if (tem != 0)
 522             fprintf_unfiltered (stream, ", ");
 523           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 524         }
 525       fprintf_unfiltered (stream, "]");
 526       return;
 527
 528     case BINOP_VAL:
 529       (*pos) += 2;
 530       fprintf_unfiltered (stream, "VAL(");
 531       type_print (exp->elts[pc + 1].type, "", stream, 0);
 532       fprintf_unfiltered (stream, ",");
 533       print_subexp (exp, pos, stream, PREC_PREFIX);
 534       fprintf_unfiltered (stream, ")");
 535       return;
 536
 537       /* Default ops */
 538
 539     default:
 540       op_str = "???";
 541       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 542         if (op_print_tab[tem].opcode == opcode)
 543           {
 544             op_str = op_print_tab[tem].string;
 545             myprec = op_print_tab[tem].precedence;
 546             assoc = op_print_tab[tem].right_assoc;
 547             break;
 548           }
 549       if (op_print_tab[tem].opcode != opcode)
 550         /* Not found; don't try to keep going because we don't know how
 551            to interpret further elements.  For example, this happens
 552            if opcode is OP_TYPE.  */
 553         error (_("Invalid expression"));
 554     }
 555
 556   /* Note that PREC_BUILTIN will always emit parentheses.  */
 557   if ((int) myprec < (int) prec)
 558     fputs_filtered ("(", stream);
 559   if ((int) opcode > (int) BINOP_END)
 560     {
 561       if (assoc)
 562         {
 563           /* Unary postfix operator.  */
 564           print_subexp (exp, pos, stream, PREC_SUFFIX);
 565           fputs_filtered (op_str, stream);
 566         }
 567       else
 568         {
 569           /* Unary prefix operator.  */
 570           fputs_filtered (op_str, stream);
 571           if (myprec == PREC_BUILTIN_FUNCTION)
 572             fputs_filtered ("(", stream);
 573           print_subexp (exp, pos, stream, PREC_PREFIX);
 574           if (myprec == PREC_BUILTIN_FUNCTION)
 575             fputs_filtered (")", stream);
 576         }
 577     }
 578   else
 579     {
 580       /* Binary operator.  */
 581       /* Print left operand.
 582          If operator is right-associative,
 583          increment precedence for this operand.  */
 584       print_subexp (exp, pos, stream,
 585                     (enum precedence) ((int) myprec + assoc));
 586       /* Print the operator itself.  */
 587       if (assign_modify)
 588         fprintf_filtered (stream, " %s= ", op_str);
 589       else if (op_str[0] == ',')
 590         fprintf_filtered (stream, "%s ", op_str);
 591       else
 592         fprintf_filtered (stream, " %s ", op_str);
 593       /* Print right operand.
 594          If operator is left-associative,
 595          increment precedence for this operand.  */
 596       print_subexp (exp, pos, stream,
 597                     (enum precedence) ((int) myprec + !assoc));
 598     }
 599
 600   if ((int) myprec < (int) prec)
 601     fputs_filtered (")", stream);
 602 }
 603
 604 /* Return the operator corresponding to opcode OP as
 605    a string.   NULL indicates that the opcode was not found in the
 606    current language table.  */
 607 char *
 608 op_string (enum exp_opcode op)
 609 {
 610   int tem;
 611   const struct op_print *op_print_tab;
 612
 613   op_print_tab = current_language->la_op_print_tab;
 614   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 615     if (op_print_tab[tem].opcode == op)
 616       return op_print_tab[tem].string;
 617   return NULL;
 618 }
 619
 620 /* Support for dumping the raw data from expressions in a human readable
 621    form.  */
 622
 623 static char *op_name (struct expression *, enum exp_opcode);
 624 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 625
 626 /* Name for OPCODE, when it appears in expression EXP.  */
 627
 628 static char *
 629 op_name (struct expression *exp, enum exp_opcode opcode)
 630 {
 631   return exp->language_defn->la_exp_desc->op_name (opcode);
 632 }
 633
 634 /* Default name for the standard operator OPCODE (i.e., one defined in
 635    the definition of enum exp_opcode).  */
 636
 637 char *
 638 op_name_standard (enum exp_opcode opcode)
 639 {
 640   switch (opcode)
 641     {
 642     default:
 643       {
 644         static char buf[30];
 645
 646         sprintf (buf, "<unknown %d>", opcode);
 647         return buf;
 648       }
 649     case OP_NULL:
 650       return "OP_NULL";
 651     case BINOP_ADD:
 652       return "BINOP_ADD";
 653     case BINOP_SUB:
 654       return "BINOP_SUB";
 655     case BINOP_MUL:
 656       return "BINOP_MUL";
 657     case BINOP_DIV:
 658       return "BINOP_DIV";
 659     case BINOP_REM:
 660       return "BINOP_REM";
 661     case BINOP_MOD:
 662       return "BINOP_MOD";
 663     case BINOP_LSH:
 664       return "BINOP_LSH";
 665     case BINOP_RSH:
 666       return "BINOP_RSH";
 667     case BINOP_LOGICAL_AND:
 668       return "BINOP_LOGICAL_AND";
 669     case BINOP_LOGICAL_OR:
 670       return "BINOP_LOGICAL_OR";
 671     case BINOP_BITWISE_AND:
 672       return "BINOP_BITWISE_AND";
 673     case BINOP_BITWISE_IOR:
 674       return "BINOP_BITWISE_IOR";
 675     case BINOP_BITWISE_XOR:
 676       return "BINOP_BITWISE_XOR";
 677     case BINOP_EQUAL:
 678       return "BINOP_EQUAL";
 679     case BINOP_NOTEQUAL:
 680       return "BINOP_NOTEQUAL";
 681     case BINOP_LESS:
 682       return "BINOP_LESS";
 683     case BINOP_GTR:
 684       return "BINOP_GTR";
 685     case BINOP_LEQ:
 686       return "BINOP_LEQ";
 687     case BINOP_GEQ:
 688       return "BINOP_GEQ";
 689     case BINOP_REPEAT:
 690       return "BINOP_REPEAT";
 691     case BINOP_ASSIGN:
 692       return "BINOP_ASSIGN";
 693     case BINOP_COMMA:
 694       return "BINOP_COMMA";
 695     case BINOP_SUBSCRIPT:
 696       return "BINOP_SUBSCRIPT";
 697     case MULTI_SUBSCRIPT:
 698       return "MULTI_SUBSCRIPT";
 699     case BINOP_EXP:
 700       return "BINOP_EXP";
 701     case BINOP_MIN:
 702       return "BINOP_MIN";
 703     case BINOP_MAX:
 704       return "BINOP_MAX";
 705     case STRUCTOP_MEMBER:
 706       return "STRUCTOP_MEMBER";
 707     case STRUCTOP_MPTR:
 708       return "STRUCTOP_MPTR";
 709     case BINOP_INTDIV:
 710       return "BINOP_INTDIV";
 711     case BINOP_ASSIGN_MODIFY:
 712       return "BINOP_ASSIGN_MODIFY";
 713     case BINOP_VAL:
 714       return "BINOP_VAL";
 715     case BINOP_CONCAT:
 716       return "BINOP_CONCAT";
 717     case BINOP_RANGE:
 718       return "BINOP_RANGE";
 719     case BINOP_END:
 720       return "BINOP_END";
 721     case TERNOP_COND:
 722       return "TERNOP_COND";
 723     case TERNOP_SLICE:
 724       return "TERNOP_SLICE";
 725     case TERNOP_SLICE_COUNT:
 726       return "TERNOP_SLICE_COUNT";
 727     case OP_LONG:
 728       return "OP_LONG";
 729     case OP_DOUBLE:
 730       return "OP_DOUBLE";
 731     case OP_VAR_VALUE:
 732       return "OP_VAR_VALUE";
 733     case OP_LAST:
 734       return "OP_LAST";
 735     case OP_REGISTER:
 736       return "OP_REGISTER";
 737     case OP_INTERNALVAR:
 738       return "OP_INTERNALVAR";
 739     case OP_FUNCALL:
 740       return "OP_FUNCALL";
 741     case OP_STRING:
 742       return "OP_STRING";
 743     case OP_BITSTRING:
 744       return "OP_BITSTRING";
 745     case OP_ARRAY:
 746       return "OP_ARRAY";
 747     case UNOP_CAST:
 748       return "UNOP_CAST";
 749     case UNOP_DYNAMIC_CAST:
 750       return "UNOP_DYNAMIC_CAST";
 751     case UNOP_REINTERPRET_CAST:
 752       return "UNOP_REINTERPRET_CAST";
 753     case UNOP_MEMVAL:
 754       return "UNOP_MEMVAL";
 755     case UNOP_MEMVAL_TLS:
 756       return "UNOP_MEMVAL_TLS";
 757     case UNOP_NEG:
 758       return "UNOP_NEG";
 759     case UNOP_LOGICAL_NOT:
 760       return "UNOP_LOGICAL_NOT";
 761     case UNOP_COMPLEMENT:
 762       return "UNOP_COMPLEMENT";
 763     case UNOP_IND:
 764       return "UNOP_IND";
 765     case UNOP_ADDR:
 766       return "UNOP_ADDR";
 767     case UNOP_PREINCREMENT:
 768       return "UNOP_PREINCREMENT";
 769     case UNOP_POSTINCREMENT:
 770       return "UNOP_POSTINCREMENT";
 771     case UNOP_PREDECREMENT:
 772       return "UNOP_PREDECREMENT";
 773     case UNOP_POSTDECREMENT:
 774       return "UNOP_POSTDECREMENT";
 775     case UNOP_SIZEOF:
 776       return "UNOP_SIZEOF";
 777     case UNOP_PLUS:
 778       return "UNOP_PLUS";
 779     case UNOP_CAP:
 780       return "UNOP_CAP";
 781     case UNOP_CHR:
 782       return "UNOP_CHR";
 783     case UNOP_ORD:
 784       return "UNOP_ORD";
 785     case UNOP_ABS:
 786       return "UNOP_ABS";
 787     case UNOP_FLOAT:
 788       return "UNOP_FLOAT";
 789     case UNOP_HIGH:
 790       return "UNOP_HIGH";
 791     case UNOP_MAX:
 792       return "UNOP_MAX";
 793     case UNOP_MIN:
 794       return "UNOP_MIN";
 795     case UNOP_ODD:
 796       return "UNOP_ODD";
 797     case UNOP_TRUNC:
 798       return "UNOP_TRUNC";
 799     case OP_BOOL:
 800       return "OP_BOOL";
 801     case OP_M2_STRING:
 802       return "OP_M2_STRING";
 803     case STRUCTOP_STRUCT:
 804       return "STRUCTOP_STRUCT";
 805     case STRUCTOP_PTR:
 806       return "STRUCTOP_PTR";
 807     case OP_THIS:
 808       return "OP_THIS";
 809     case OP_OBJC_SELF:
 810       return "OP_OBJC_SELF";
 811     case OP_SCOPE:
 812       return "OP_SCOPE";
 813     case OP_TYPE:
 814       return "OP_TYPE";
 815     case OP_LABELED:
 816       return "OP_LABELED";
 817     case OP_ADL_FUNC:
 818       return "OP_ADL_FUNC";
 819     }
 820 }
 821
 822 /* Print a raw dump of expression EXP to STREAM.
 823    NOTE, if non-NULL, is printed as extra explanatory text.  */
 824
 825 void
 826 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 827                      char *note)
 828 {
 829   int elt;
 830   char *opcode_name;
 831   char *eltscan;
 832   int eltsize;
 833
 834   fprintf_filtered (stream, "Dump of expression @ ");
 835   gdb_print_host_address (exp, stream);
 836   if (note)
 837     fprintf_filtered (stream, ", %s:", note);
 838   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 839                     exp->language_defn->la_name, exp->nelts,
 840                     (long) sizeof (union exp_element));
 841   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 842                     "Hex Value", "String Value");
 843   for (elt = 0; elt < exp->nelts; elt++)
 844     {
 845       fprintf_filtered (stream, "\t%5d  ", elt);
 846       opcode_name = op_name (exp, exp->elts[elt].opcode);
 847
 848       fprintf_filtered (stream, "%20s  ", opcode_name);
 849       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 850       fprintf_filtered (stream, "  ");
 851
 852       for (eltscan = (char *) &exp->elts[elt],
 853            eltsize = sizeof (union exp_element);
 854            eltsize-- > 0;
 855            eltscan++)
 856         {
 857           fprintf_filtered (stream, "%c",
 858                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 859         }
 860       fprintf_filtered (stream, "\n");
 861     }
 862 }
 863
 864 /* Dump the subexpression of prefix expression EXP whose operator is at
 865    position ELT onto STREAM.  Returns the position of the next
 866    subexpression in EXP.  */
 867
 868 int
 869 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 870 {
 871   static int indent = 0;
 872   int i;
 873
 874   fprintf_filtered (stream, "\n");
 875   fprintf_filtered (stream, "\t%5d  ", elt);
 876
 877   for (i = 1; i <= indent; i++)
 878     fprintf_filtered (stream, " ");
 879   indent += 2;
 880
 881   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 882
 883   elt = dump_subexp_body (exp, stream, elt);
 884
 885   indent -= 2;
 886
 887   return elt;
 888 }
 889
 890 /* Dump the operands of prefix expression EXP whose opcode is at
 891    position ELT onto STREAM.  Returns the position of the next
 892    subexpression in EXP.  */
 893
 894 static int
 895 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 896 {
 897   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 898 }
 899
 900 /* Default value for subexp_body in exp_descriptor vector.  */
 901
 902 int
 903 dump_subexp_body_standard (struct expression *exp,
 904                            struct ui_file *stream, int elt)
 905 {
 906   int opcode = exp->elts[elt++].opcode;
 907
 908   switch (opcode)
 909     {
 910     case TERNOP_COND:
 911     case TERNOP_SLICE:
 912     case TERNOP_SLICE_COUNT:
 913       elt = dump_subexp (exp, stream, elt);
 914     case BINOP_ADD:
 915     case BINOP_SUB:
 916     case BINOP_MUL:
 917     case BINOP_DIV:
 918     case BINOP_REM:
 919     case BINOP_MOD:
 920     case BINOP_LSH:
 921     case BINOP_RSH:
 922     case BINOP_LOGICAL_AND:
 923     case BINOP_LOGICAL_OR:
 924     case BINOP_BITWISE_AND:
 925     case BINOP_BITWISE_IOR:
 926     case BINOP_BITWISE_XOR:
 927     case BINOP_EQUAL:
 928     case BINOP_NOTEQUAL:
 929     case BINOP_LESS:
 930     case BINOP_GTR:
 931     case BINOP_LEQ:
 932     case BINOP_GEQ:
 933     case BINOP_REPEAT:
 934     case BINOP_ASSIGN:
 935     case BINOP_COMMA:
 936     case BINOP_SUBSCRIPT:
 937     case BINOP_EXP:
 938     case BINOP_MIN:
 939     case BINOP_MAX:
 940     case BINOP_INTDIV:
 941     case BINOP_ASSIGN_MODIFY:
 942     case BINOP_VAL:
 943     case BINOP_CONCAT:
 944     case BINOP_IN:
 945     case BINOP_RANGE:
 946     case BINOP_END:
 947     case STRUCTOP_MEMBER:
 948     case STRUCTOP_MPTR:
 949       elt = dump_subexp (exp, stream, elt);
 950     case UNOP_NEG:
 951     case UNOP_LOGICAL_NOT:
 952     case UNOP_COMPLEMENT:
 953     case UNOP_IND:
 954     case UNOP_ADDR:
 955     case UNOP_PREINCREMENT:
 956     case UNOP_POSTINCREMENT:
 957     case UNOP_PREDECREMENT:
 958     case UNOP_POSTDECREMENT:
 959     case UNOP_SIZEOF:
 960     case UNOP_PLUS:
 961     case UNOP_CAP:
 962     case UNOP_CHR:
 963     case UNOP_ORD:
 964     case UNOP_ABS:
 965     case UNOP_FLOAT:
 966     case UNOP_HIGH:
 967     case UNOP_MAX:
 968     case UNOP_MIN:
 969     case UNOP_ODD:
 970     case UNOP_TRUNC:
 971       elt = dump_subexp (exp, stream, elt);
 972       break;
 973     case OP_LONG:
 974       fprintf_filtered (stream, "Type @");
 975       gdb_print_host_address (exp->elts[elt].type, stream);
 976       fprintf_filtered (stream, " (");
 977       type_print (exp->elts[elt].type, NULL, stream, 0);
 978       fprintf_filtered (stream, "), value %ld (0x%lx)",
 979                         (long) exp->elts[elt + 1].longconst,
 980                         (long) exp->elts[elt + 1].longconst);
 981       elt += 3;
 982       break;
 983     case OP_DOUBLE:
 984       fprintf_filtered (stream, "Type @");
 985       gdb_print_host_address (exp->elts[elt].type, stream);
 986       fprintf_filtered (stream, " (");
 987       type_print (exp->elts[elt].type, NULL, stream, 0);
 988       fprintf_filtered (stream, "), value %g",
 989                         (double) exp->elts[elt + 1].doubleconst);
 990       elt += 3;
 991       break;
 992     case OP_VAR_VALUE:
 993       fprintf_filtered (stream, "Block @");
 994       gdb_print_host_address (exp->elts[elt].block, stream);
 995       fprintf_filtered (stream, ", symbol @");
 996       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 997       fprintf_filtered (stream, " (%s)",
 998                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 999       elt += 3;
1000       break;
1001     case OP_LAST:
1002       fprintf_filtered (stream, "History element %ld",
1003                         (long) exp->elts[elt].longconst);
1004       elt += 2;
1005       break;
1006     case OP_REGISTER:
1007       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
1008       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
1009       break;
1010     case OP_INTERNALVAR:
1011       fprintf_filtered (stream, "Internal var @");
1012       gdb_print_host_address (exp->elts[elt].internalvar, stream);
1013       fprintf_filtered (stream, " (%s)",
1014                         internalvar_name (exp->elts[elt].internalvar));
1015       elt += 2;
1016       break;
1017     case OP_FUNCALL:
1018       {
1019         int i, nargs;
1020
1021         nargs = longest_to_int (exp->elts[elt].longconst);
1022
1023         fprintf_filtered (stream, "Number of args: %d", nargs);
1024         elt += 2;
1025
1026         for (i = 1; i <= nargs + 1; i++)
1027           elt = dump_subexp (exp, stream, elt);
1028       }
1029       break;
1030     case OP_ARRAY:
1031       {
1032         int lower, upper;
1033         int i;
1034
1035         lower = longest_to_int (exp->elts[elt].longconst);
1036         upper = longest_to_int (exp->elts[elt + 1].longconst);
1037
1038         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
1039         elt += 3;
1040
1041         for (i = 1; i <= upper - lower + 1; i++)
1042           elt = dump_subexp (exp, stream, elt);
1043       }
1044       break;
1045     case UNOP_MEMVAL:
1046     case UNOP_CAST:
1047     case UNOP_DYNAMIC_CAST:
1048     case UNOP_REINTERPRET_CAST:
1049       fprintf_filtered (stream, "Type @");
1050       gdb_print_host_address (exp->elts[elt].type, stream);
1051       fprintf_filtered (stream, " (");
1052       type_print (exp->elts[elt].type, NULL, stream, 0);
1053       fprintf_filtered (stream, ")");
1054       elt = dump_subexp (exp, stream, elt + 2);
1055       break;
1056     case UNOP_MEMVAL_TLS:
1057       fprintf_filtered (stream, "TLS type @");
1058       gdb_print_host_address (exp->elts[elt + 1].type, stream);
1059       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
1060                         (exp->elts[elt].objfile == NULL ? "(null)"
1061                          : exp->elts[elt].objfile->name));
1062       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
1063       fprintf_filtered (stream, ")");
1064       elt = dump_subexp (exp, stream, elt + 3);
1065       break;
1066     case OP_TYPE:
1067       fprintf_filtered (stream, "Type @");
1068       gdb_print_host_address (exp->elts[elt].type, stream);
1069       fprintf_filtered (stream, " (");
1070       type_print (exp->elts[elt].type, NULL, stream, 0);
1071       fprintf_filtered (stream, ")");
1072       elt += 2;
1073       break;
1074     case STRUCTOP_STRUCT:
1075     case STRUCTOP_PTR:
1076       {
1077         char *elem_name;
1078         int len;
1079
1080         len = longest_to_int (exp->elts[elt].longconst);
1081         elem_name = &exp->elts[elt + 1].string;
1082
1083         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1084         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1085       }
1086       break;
1087     case OP_SCOPE:
1088       {
1089         char *elem_name;
1090         int len;
1091
1092         fprintf_filtered (stream, "Type @");
1093         gdb_print_host_address (exp->elts[elt].type, stream);
1094         fprintf_filtered (stream, " (");
1095         type_print (exp->elts[elt].type, NULL, stream, 0);
1096         fprintf_filtered (stream, ") ");
1097
1098         len = longest_to_int (exp->elts[elt + 1].longconst);
1099         elem_name = &exp->elts[elt + 2].string;
1100
1101         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1102         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1103       }
1104       break;
1105     default:
1106     case OP_NULL:
1107     case MULTI_SUBSCRIPT:
1108     case OP_F77_UNDETERMINED_ARGLIST:
1109     case OP_COMPLEX:
1110     case OP_STRING:
1111     case OP_BITSTRING:
1112     case OP_BOOL:
1113     case OP_M2_STRING:
1114     case OP_THIS:
1115     case OP_LABELED:
1116     case OP_NAME:
1117       fprintf_filtered (stream, "Unknown format");
1118     }
1119
1120   return elt;
1121 }
1122
1123 void
1124 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1125 {
1126   int elt;
1127
1128   fprintf_filtered (stream, "Dump of expression @ ");
1129   gdb_print_host_address (exp, stream);
1130   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1131   if (exp->elts[0].opcode != OP_TYPE)
1132     print_expression (exp, stream);
1133   else
1134     fputs_filtered ("Type printing not yet supported....", stream);
1135   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1136                     exp->language_defn->la_name, exp->nelts,
1137                     (long) sizeof (union exp_element));
1138   fputs_filtered ("\n", stream);
1139
1140   for (elt = 0; elt < exp->nelts;)
1141     elt = dump_subexp (exp, stream, elt);
1142   fputs_filtered ("\n", stream);
1143 }