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
   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 NSString constant.  */
 209       {
 210         struct value_print_options opts;
 211
 212         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 213         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 214         fputs_filtered ("@\"", stream);
 215         get_user_print_options (&opts);
 216         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 217                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 218         fputs_filtered ("\"", stream);
 219       }
 220       return;
 221
 222     case OP_OBJC_MSGCALL:
 223       {                 /* Objective C message (method) call.  */
 224         char *selector;
 225
 226         (*pos) += 3;
 227         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 228         fprintf_unfiltered (stream, "[");
 229         print_subexp (exp, pos, stream, PREC_SUFFIX);
 230         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 231                                      &selector, 1024, NULL))
 232           {
 233             error (_("bad selector"));
 234             return;
 235           }
 236         if (nargs)
 237           {
 238             char *s, *nextS;
 239
 240             s = alloca (strlen (selector) + 1);
 241             strcpy (s, selector);
 242             for (tem = 0; tem < nargs; tem++)
 243               {
 244                 nextS = strchr (s, ':');
 245                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 246                 *nextS = '\0';
 247                 fprintf_unfiltered (stream, " %s: ", s);
 248                 s = nextS + 1;
 249                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 250               }
 251           }
 252         else
 253           {
 254             fprintf_unfiltered (stream, " %s", selector);
 255           }
 256         fprintf_unfiltered (stream, "]");
 257         /* "selector" was malloc'd by target_read_string. Free it.  */
 258         xfree (selector);
 259         return;
 260       }
 261
 262     case OP_ARRAY:
 263       (*pos) += 3;
 264       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 265       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 266       nargs++;
 267       tem = 0;
 268       if (exp->elts[pc + 4].opcode == OP_LONG
 269           && exp->elts[pc + 5].type
 270              == builtin_type (exp->gdbarch)->builtin_char
 271           && exp->language_defn->la_language == language_c)
 272         {
 273           /* Attempt to print C character arrays using string syntax.
 274              Walk through the args, picking up one character from each
 275              of the OP_LONG expression elements.  If any array element
 276              does not match our expection of what we should find for
 277              a simple string, revert back to array printing.  Note that
 278              the last expression element is an explicit null terminator
 279              byte, which doesn't get printed. */
 280           tempstr = alloca (nargs);
 281           pc += 4;
 282           while (tem < nargs)
 283             {
 284               if (exp->elts[pc].opcode != OP_LONG
 285                   || exp->elts[pc + 1].type
 286                      != builtin_type (exp->gdbarch)->builtin_char)
 287                 {
 288                   /* Not a simple array of char, use regular array printing. */
 289                   tem = 0;
 290                   break;
 291                 }
 292               else
 293                 {
 294                   tempstr[tem++] =
 295                     longest_to_int (exp->elts[pc + 2].longconst);
 296                   pc += 4;
 297                 }
 298             }
 299         }
 300       if (tem > 0)
 301         {
 302           struct value_print_options opts;
 303
 304           get_user_print_options (&opts);
 305           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 306                            tempstr, nargs - 1, NULL, 0, &opts);
 307           (*pos) = pc;
 308         }
 309       else
 310         {
 311           fputs_filtered (" {", stream);
 312           for (tem = 0; tem < nargs; tem++)
 313             {
 314               if (tem != 0)
 315                 {
 316                   fputs_filtered (", ", stream);
 317                 }
 318               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 319             }
 320           fputs_filtered ("}", stream);
 321         }
 322       return;
 323
 324     case OP_LABELED:
 325       tem = longest_to_int (exp->elts[pc + 1].longconst);
 326       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 327       /* Gcc support both these syntaxes.  Unsure which is preferred.  */
 328 #if 1
 329       fputs_filtered (&exp->elts[pc + 2].string, stream);
 330       fputs_filtered (": ", stream);
 331 #else
 332       fputs_filtered (".", stream);
 333       fputs_filtered (&exp->elts[pc + 2].string, stream);
 334       fputs_filtered ("=", stream);
 335 #endif
 336       print_subexp (exp, pos, stream, PREC_SUFFIX);
 337       return;
 338
 339     case TERNOP_COND:
 340       if ((int) prec > (int) PREC_COMMA)
 341         fputs_filtered ("(", stream);
 342       /* Print the subexpressions, forcing parentheses
 343          around any binary operations within them.
 344          This is more parentheses than are strictly necessary,
 345          but it looks clearer.  */
 346       print_subexp (exp, pos, stream, PREC_HYPER);
 347       fputs_filtered (" ? ", stream);
 348       print_subexp (exp, pos, stream, PREC_HYPER);
 349       fputs_filtered (" : ", stream);
 350       print_subexp (exp, pos, stream, PREC_HYPER);
 351       if ((int) prec > (int) PREC_COMMA)
 352         fputs_filtered (")", stream);
 353       return;
 354
 355     case TERNOP_SLICE:
 356     case TERNOP_SLICE_COUNT:
 357       print_subexp (exp, pos, stream, PREC_SUFFIX);
 358       fputs_filtered ("(", stream);
 359       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 360       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 361       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 362       fputs_filtered (")", stream);
 363       return;
 364
 365     case STRUCTOP_STRUCT:
 366       tem = longest_to_int (exp->elts[pc + 1].longconst);
 367       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 368       print_subexp (exp, pos, stream, PREC_SUFFIX);
 369       fputs_filtered (".", stream);
 370       fputs_filtered (&exp->elts[pc + 2].string, stream);
 371       return;
 372
 373       /* Will not occur for Modula-2 */
 374     case STRUCTOP_PTR:
 375       tem = longest_to_int (exp->elts[pc + 1].longconst);
 376       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 377       print_subexp (exp, pos, stream, PREC_SUFFIX);
 378       fputs_filtered ("->", stream);
 379       fputs_filtered (&exp->elts[pc + 2].string, stream);
 380       return;
 381
 382     case STRUCTOP_MEMBER:
 383       print_subexp (exp, pos, stream, PREC_SUFFIX);
 384       fputs_filtered (".*", stream);
 385       print_subexp (exp, pos, stream, PREC_SUFFIX);
 386       return;
 387
 388     case STRUCTOP_MPTR:
 389       print_subexp (exp, pos, stream, PREC_SUFFIX);
 390       fputs_filtered ("->*", stream);
 391       print_subexp (exp, pos, stream, PREC_SUFFIX);
 392       return;
 393
 394     case BINOP_SUBSCRIPT:
 395       print_subexp (exp, pos, stream, PREC_SUFFIX);
 396       fputs_filtered ("[", stream);
 397       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 398       fputs_filtered ("]", stream);
 399       return;
 400
 401     case UNOP_POSTINCREMENT:
 402       print_subexp (exp, pos, stream, PREC_SUFFIX);
 403       fputs_filtered ("++", stream);
 404       return;
 405
 406     case UNOP_POSTDECREMENT:
 407       print_subexp (exp, pos, stream, PREC_SUFFIX);
 408       fputs_filtered ("--", stream);
 409       return;
 410
 411     case UNOP_CAST:
 412       (*pos) += 2;
 413       if ((int) prec > (int) PREC_PREFIX)
 414         fputs_filtered ("(", stream);
 415       fputs_filtered ("(", stream);
 416       type_print (exp->elts[pc + 1].type, "", stream, 0);
 417       fputs_filtered (") ", stream);
 418       print_subexp (exp, pos, stream, PREC_PREFIX);
 419       if ((int) prec > (int) PREC_PREFIX)
 420         fputs_filtered (")", stream);
 421       return;
 422
 423     case UNOP_DYNAMIC_CAST:
 424     case UNOP_REINTERPRET_CAST:
 425       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 426                       : "reinterpret_cast", stream);
 427       fputs_filtered ("<", stream);
 428       (*pos) += 2;
 429       type_print (exp->elts[pc + 1].type, "", stream, 0);
 430       fputs_filtered ("> (", stream);
 431       print_subexp (exp, pos, stream, PREC_PREFIX);
 432       fputs_filtered (")", stream);
 433       return;
 434
 435     case UNOP_MEMVAL:
 436       (*pos) += 2;
 437       if ((int) prec > (int) PREC_PREFIX)
 438         fputs_filtered ("(", stream);
 439       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 440           && exp->elts[pc + 3].opcode == OP_LONG)
 441         {
 442           struct value_print_options opts;
 443
 444           /* We have a minimal symbol fn, probably.  It's encoded
 445              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 446              Swallow the OP_LONG (including both its opcodes); ignore
 447              its type; print the value in the type of the MEMVAL.  */
 448           (*pos) += 4;
 449           val = value_at_lazy (exp->elts[pc + 1].type,
 450                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 451           get_raw_print_options (&opts);
 452           value_print (val, stream, &opts);
 453         }
 454       else
 455         {
 456           fputs_filtered ("{", stream);
 457           type_print (exp->elts[pc + 1].type, "", stream, 0);
 458           fputs_filtered ("} ", stream);
 459           print_subexp (exp, pos, stream, PREC_PREFIX);
 460         }
 461       if ((int) prec > (int) PREC_PREFIX)
 462         fputs_filtered (")", stream);
 463       return;
 464
 465     case UNOP_MEMVAL_TLS:
 466       (*pos) += 3;
 467       if ((int) prec > (int) PREC_PREFIX)
 468         fputs_filtered ("(", stream);
 469       fputs_filtered ("{", stream);
 470       type_print (exp->elts[pc + 2].type, "", stream, 0);
 471       fputs_filtered ("} ", stream);
 472       print_subexp (exp, pos, stream, PREC_PREFIX);
 473       if ((int) prec > (int) PREC_PREFIX)
 474         fputs_filtered (")", stream);
 475       return;
 476
 477     case BINOP_ASSIGN_MODIFY:
 478       opcode = exp->elts[pc + 1].opcode;
 479       (*pos) += 2;
 480       myprec = PREC_ASSIGN;
 481       assoc = 1;
 482       assign_modify = 1;
 483       op_str = "???";
 484       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 485         if (op_print_tab[tem].opcode == opcode)
 486           {
 487             op_str = op_print_tab[tem].string;
 488             break;
 489           }
 490       if (op_print_tab[tem].opcode != opcode)
 491         /* Not found; don't try to keep going because we don't know how
 492            to interpret further elements.  */
 493         error (_("Invalid expression"));
 494       break;
 495
 496       /* C++ ops */
 497
 498     case OP_THIS:
 499       ++(*pos);
 500       fputs_filtered ("this", stream);
 501       return;
 502
 503       /* Objective-C ops */
 504
 505     case OP_OBJC_SELF:
 506       ++(*pos);
 507       fputs_filtered ("self", stream);  /* The ObjC equivalent of "this".  */
 508       return;
 509
 510       /* Modula-2 ops */
 511
 512     case MULTI_SUBSCRIPT:
 513       (*pos) += 2;
 514       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 515       print_subexp (exp, pos, stream, PREC_SUFFIX);
 516       fprintf_unfiltered (stream, " [");
 517       for (tem = 0; tem < nargs; tem++)
 518         {
 519           if (tem != 0)
 520             fprintf_unfiltered (stream, ", ");
 521           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 522         }
 523       fprintf_unfiltered (stream, "]");
 524       return;
 525
 526     case BINOP_VAL:
 527       (*pos) += 2;
 528       fprintf_unfiltered (stream, "VAL(");
 529       type_print (exp->elts[pc + 1].type, "", stream, 0);
 530       fprintf_unfiltered (stream, ",");
 531       print_subexp (exp, pos, stream, PREC_PREFIX);
 532       fprintf_unfiltered (stream, ")");
 533       return;
 534
 535     case BINOP_INCL:
 536     case BINOP_EXCL:
 537       error (_("print_subexp:  Not implemented."));
 538
 539       /* Default ops */
 540
 541     default:
 542       op_str = "???";
 543       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 544         if (op_print_tab[tem].opcode == opcode)
 545           {
 546             op_str = op_print_tab[tem].string;
 547             myprec = op_print_tab[tem].precedence;
 548             assoc = op_print_tab[tem].right_assoc;
 549             break;
 550           }
 551       if (op_print_tab[tem].opcode != opcode)
 552         /* Not found; don't try to keep going because we don't know how
 553            to interpret further elements.  For example, this happens
 554            if opcode is OP_TYPE.  */
 555         error (_("Invalid expression"));
 556     }
 557
 558   /* Note that PREC_BUILTIN will always emit parentheses. */
 559   if ((int) myprec < (int) prec)
 560     fputs_filtered ("(", stream);
 561   if ((int) opcode > (int) BINOP_END)
 562     {
 563       if (assoc)
 564         {
 565           /* Unary postfix operator.  */
 566           print_subexp (exp, pos, stream, PREC_SUFFIX);
 567           fputs_filtered (op_str, stream);
 568         }
 569       else
 570         {
 571           /* Unary prefix operator.  */
 572           fputs_filtered (op_str, stream);
 573           if (myprec == PREC_BUILTIN_FUNCTION)
 574             fputs_filtered ("(", stream);
 575           print_subexp (exp, pos, stream, PREC_PREFIX);
 576           if (myprec == PREC_BUILTIN_FUNCTION)
 577             fputs_filtered (")", stream);
 578         }
 579     }
 580   else
 581     {
 582       /* Binary operator.  */
 583       /* Print left operand.
 584          If operator is right-associative,
 585          increment precedence for this operand.  */
 586       print_subexp (exp, pos, stream,
 587                     (enum precedence) ((int) myprec + assoc));
 588       /* Print the operator itself.  */
 589       if (assign_modify)
 590         fprintf_filtered (stream, " %s= ", op_str);
 591       else if (op_str[0] == ',')
 592         fprintf_filtered (stream, "%s ", op_str);
 593       else
 594         fprintf_filtered (stream, " %s ", op_str);
 595       /* Print right operand.
 596          If operator is left-associative,
 597          increment precedence for this operand.  */
 598       print_subexp (exp, pos, stream,
 599                     (enum precedence) ((int) myprec + !assoc));
 600     }
 601
 602   if ((int) myprec < (int) prec)
 603     fputs_filtered (")", stream);
 604 }
 605
 606 /* Return the operator corresponding to opcode OP as
 607    a string.   NULL indicates that the opcode was not found in the
 608    current language table.  */
 609 char *
 610 op_string (enum exp_opcode op)
 611 {
 612   int tem;
 613   const struct op_print *op_print_tab;
 614
 615   op_print_tab = current_language->la_op_print_tab;
 616   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 617     if (op_print_tab[tem].opcode == op)
 618       return op_print_tab[tem].string;
 619   return NULL;
 620 }
 621
 622 /* Support for dumping the raw data from expressions in a human readable
 623    form.  */
 624
 625 static char *op_name (struct expression *, enum exp_opcode);
 626 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 627
 628 /* Name for OPCODE, when it appears in expression EXP. */
 629
 630 static char *
 631 op_name (struct expression *exp, enum exp_opcode opcode)
 632 {
 633   return exp->language_defn->la_exp_desc->op_name (opcode);
 634 }
 635
 636 /* Default name for the standard operator OPCODE (i.e., one defined in
 637    the definition of enum exp_opcode).  */
 638
 639 char *
 640 op_name_standard (enum exp_opcode opcode)
 641 {
 642   switch (opcode)
 643     {
 644     default:
 645       {
 646         static char buf[30];
 647
 648         sprintf (buf, "<unknown %d>", opcode);
 649         return buf;
 650       }
 651     case OP_NULL:
 652       return "OP_NULL";
 653     case BINOP_ADD:
 654       return "BINOP_ADD";
 655     case BINOP_SUB:
 656       return "BINOP_SUB";
 657     case BINOP_MUL:
 658       return "BINOP_MUL";
 659     case BINOP_DIV:
 660       return "BINOP_DIV";
 661     case BINOP_REM:
 662       return "BINOP_REM";
 663     case BINOP_MOD:
 664       return "BINOP_MOD";
 665     case BINOP_LSH:
 666       return "BINOP_LSH";
 667     case BINOP_RSH:
 668       return "BINOP_RSH";
 669     case BINOP_LOGICAL_AND:
 670       return "BINOP_LOGICAL_AND";
 671     case BINOP_LOGICAL_OR:
 672       return "BINOP_LOGICAL_OR";
 673     case BINOP_BITWISE_AND:
 674       return "BINOP_BITWISE_AND";
 675     case BINOP_BITWISE_IOR:
 676       return "BINOP_BITWISE_IOR";
 677     case BINOP_BITWISE_XOR:
 678       return "BINOP_BITWISE_XOR";
 679     case BINOP_EQUAL:
 680       return "BINOP_EQUAL";
 681     case BINOP_NOTEQUAL:
 682       return "BINOP_NOTEQUAL";
 683     case BINOP_LESS:
 684       return "BINOP_LESS";
 685     case BINOP_GTR:
 686       return "BINOP_GTR";
 687     case BINOP_LEQ:
 688       return "BINOP_LEQ";
 689     case BINOP_GEQ:
 690       return "BINOP_GEQ";
 691     case BINOP_REPEAT:
 692       return "BINOP_REPEAT";
 693     case BINOP_ASSIGN:
 694       return "BINOP_ASSIGN";
 695     case BINOP_COMMA:
 696       return "BINOP_COMMA";
 697     case BINOP_SUBSCRIPT:
 698       return "BINOP_SUBSCRIPT";
 699     case MULTI_SUBSCRIPT:
 700       return "MULTI_SUBSCRIPT";
 701     case BINOP_EXP:
 702       return "BINOP_EXP";
 703     case BINOP_MIN:
 704       return "BINOP_MIN";
 705     case BINOP_MAX:
 706       return "BINOP_MAX";
 707     case STRUCTOP_MEMBER:
 708       return "STRUCTOP_MEMBER";
 709     case STRUCTOP_MPTR:
 710       return "STRUCTOP_MPTR";
 711     case BINOP_INTDIV:
 712       return "BINOP_INTDIV";
 713     case BINOP_ASSIGN_MODIFY:
 714       return "BINOP_ASSIGN_MODIFY";
 715     case BINOP_VAL:
 716       return "BINOP_VAL";
 717     case BINOP_INCL:
 718       return "BINOP_INCL";
 719     case BINOP_EXCL:
 720       return "BINOP_EXCL";
 721     case BINOP_CONCAT:
 722       return "BINOP_CONCAT";
 723     case BINOP_RANGE:
 724       return "BINOP_RANGE";
 725     case BINOP_END:
 726       return "BINOP_END";
 727     case TERNOP_COND:
 728       return "TERNOP_COND";
 729     case TERNOP_SLICE:
 730       return "TERNOP_SLICE";
 731     case TERNOP_SLICE_COUNT:
 732       return "TERNOP_SLICE_COUNT";
 733     case OP_LONG:
 734       return "OP_LONG";
 735     case OP_DOUBLE:
 736       return "OP_DOUBLE";
 737     case OP_VAR_VALUE:
 738       return "OP_VAR_VALUE";
 739     case OP_LAST:
 740       return "OP_LAST";
 741     case OP_REGISTER:
 742       return "OP_REGISTER";
 743     case OP_INTERNALVAR:
 744       return "OP_INTERNALVAR";
 745     case OP_FUNCALL:
 746       return "OP_FUNCALL";
 747     case OP_STRING:
 748       return "OP_STRING";
 749     case OP_BITSTRING:
 750       return "OP_BITSTRING";
 751     case OP_ARRAY:
 752       return "OP_ARRAY";
 753     case UNOP_CAST:
 754       return "UNOP_CAST";
 755     case UNOP_DYNAMIC_CAST:
 756       return "UNOP_DYNAMIC_CAST";
 757     case UNOP_REINTERPRET_CAST:
 758       return "UNOP_REINTERPRET_CAST";
 759     case UNOP_MEMVAL:
 760       return "UNOP_MEMVAL";
 761     case UNOP_MEMVAL_TLS:
 762       return "UNOP_MEMVAL_TLS";
 763     case UNOP_NEG:
 764       return "UNOP_NEG";
 765     case UNOP_LOGICAL_NOT:
 766       return "UNOP_LOGICAL_NOT";
 767     case UNOP_COMPLEMENT:
 768       return "UNOP_COMPLEMENT";
 769     case UNOP_IND:
 770       return "UNOP_IND";
 771     case UNOP_ADDR:
 772       return "UNOP_ADDR";
 773     case UNOP_PREINCREMENT:
 774       return "UNOP_PREINCREMENT";
 775     case UNOP_POSTINCREMENT:
 776       return "UNOP_POSTINCREMENT";
 777     case UNOP_PREDECREMENT:
 778       return "UNOP_PREDECREMENT";
 779     case UNOP_POSTDECREMENT:
 780       return "UNOP_POSTDECREMENT";
 781     case UNOP_SIZEOF:
 782       return "UNOP_SIZEOF";
 783     case UNOP_LOWER:
 784       return "UNOP_LOWER";
 785     case UNOP_UPPER:
 786       return "UNOP_UPPER";
 787     case UNOP_LENGTH:
 788       return "UNOP_LENGTH";
 789     case UNOP_PLUS:
 790       return "UNOP_PLUS";
 791     case UNOP_CAP:
 792       return "UNOP_CAP";
 793     case UNOP_CHR:
 794       return "UNOP_CHR";
 795     case UNOP_ORD:
 796       return "UNOP_ORD";
 797     case UNOP_ABS:
 798       return "UNOP_ABS";
 799     case UNOP_FLOAT:
 800       return "UNOP_FLOAT";
 801     case UNOP_HIGH:
 802       return "UNOP_HIGH";
 803     case UNOP_MAX:
 804       return "UNOP_MAX";
 805     case UNOP_MIN:
 806       return "UNOP_MIN";
 807     case UNOP_ODD:
 808       return "UNOP_ODD";
 809     case UNOP_TRUNC:
 810       return "UNOP_TRUNC";
 811     case OP_BOOL:
 812       return "OP_BOOL";
 813     case OP_M2_STRING:
 814       return "OP_M2_STRING";
 815     case STRUCTOP_STRUCT:
 816       return "STRUCTOP_STRUCT";
 817     case STRUCTOP_PTR:
 818       return "STRUCTOP_PTR";
 819     case OP_THIS:
 820       return "OP_THIS";
 821     case OP_OBJC_SELF:
 822       return "OP_OBJC_SELF";
 823     case OP_SCOPE:
 824       return "OP_SCOPE";
 825     case OP_TYPE:
 826       return "OP_TYPE";
 827     case OP_LABELED:
 828       return "OP_LABELED";
 829     case OP_ADL_FUNC:
 830       return "OP_ADL_FUNC";
 831     }
 832 }
 833
 834 /* Print a raw dump of expression EXP to STREAM.
 835    NOTE, if non-NULL, is printed as extra explanatory text.  */
 836
 837 void
 838 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 839                      char *note)
 840 {
 841   int elt;
 842   char *opcode_name;
 843   char *eltscan;
 844   int eltsize;
 845
 846   fprintf_filtered (stream, "Dump of expression @ ");
 847   gdb_print_host_address (exp, stream);
 848   if (note)
 849     fprintf_filtered (stream, ", %s:", note);
 850   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 851                     exp->language_defn->la_name, exp->nelts,
 852                     (long) sizeof (union exp_element));
 853   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 854                     "Hex Value", "String Value");
 855   for (elt = 0; elt < exp->nelts; elt++)
 856     {
 857       fprintf_filtered (stream, "\t%5d  ", elt);
 858       opcode_name = op_name (exp, exp->elts[elt].opcode);
 859
 860       fprintf_filtered (stream, "%20s  ", opcode_name);
 861       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 862       fprintf_filtered (stream, "  ");
 863
 864       for (eltscan = (char *) &exp->elts[elt],
 865            eltsize = sizeof (union exp_element);
 866            eltsize-- > 0;
 867            eltscan++)
 868         {
 869           fprintf_filtered (stream, "%c",
 870                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 871         }
 872       fprintf_filtered (stream, "\n");
 873     }
 874 }
 875
 876 /* Dump the subexpression of prefix expression EXP whose operator is at
 877    position ELT onto STREAM.  Returns the position of the next
 878    subexpression in EXP.  */
 879
 880 int
 881 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 882 {
 883   static int indent = 0;
 884   int i;
 885
 886   fprintf_filtered (stream, "\n");
 887   fprintf_filtered (stream, "\t%5d  ", elt);
 888
 889   for (i = 1; i <= indent; i++)
 890     fprintf_filtered (stream, " ");
 891   indent += 2;
 892
 893   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 894
 895   elt = dump_subexp_body (exp, stream, elt);
 896
 897   indent -= 2;
 898
 899   return elt;
 900 }
 901
 902 /* Dump the operands of prefix expression EXP whose opcode is at
 903    position ELT onto STREAM.  Returns the position of the next
 904    subexpression in EXP.  */
 905
 906 static int
 907 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 908 {
 909   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 910 }
 911
 912 /* Default value for subexp_body in exp_descriptor vector.  */
 913
 914 int
 915 dump_subexp_body_standard (struct expression *exp,
 916                            struct ui_file *stream, int elt)
 917 {
 918   int opcode = exp->elts[elt++].opcode;
 919
 920   switch (opcode)
 921     {
 922     case TERNOP_COND:
 923     case TERNOP_SLICE:
 924     case TERNOP_SLICE_COUNT:
 925       elt = dump_subexp (exp, stream, elt);
 926     case BINOP_ADD:
 927     case BINOP_SUB:
 928     case BINOP_MUL:
 929     case BINOP_DIV:
 930     case BINOP_REM:
 931     case BINOP_MOD:
 932     case BINOP_LSH:
 933     case BINOP_RSH:
 934     case BINOP_LOGICAL_AND:
 935     case BINOP_LOGICAL_OR:
 936     case BINOP_BITWISE_AND:
 937     case BINOP_BITWISE_IOR:
 938     case BINOP_BITWISE_XOR:
 939     case BINOP_EQUAL:
 940     case BINOP_NOTEQUAL:
 941     case BINOP_LESS:
 942     case BINOP_GTR:
 943     case BINOP_LEQ:
 944     case BINOP_GEQ:
 945     case BINOP_REPEAT:
 946     case BINOP_ASSIGN:
 947     case BINOP_COMMA:
 948     case BINOP_SUBSCRIPT:
 949     case BINOP_EXP:
 950     case BINOP_MIN:
 951     case BINOP_MAX:
 952     case BINOP_INTDIV:
 953     case BINOP_ASSIGN_MODIFY:
 954     case BINOP_VAL:
 955     case BINOP_INCL:
 956     case BINOP_EXCL:
 957     case BINOP_CONCAT:
 958     case BINOP_IN:
 959     case BINOP_RANGE:
 960     case BINOP_END:
 961     case STRUCTOP_MEMBER:
 962     case STRUCTOP_MPTR:
 963       elt = dump_subexp (exp, stream, elt);
 964     case UNOP_NEG:
 965     case UNOP_LOGICAL_NOT:
 966     case UNOP_COMPLEMENT:
 967     case UNOP_IND:
 968     case UNOP_ADDR:
 969     case UNOP_PREINCREMENT:
 970     case UNOP_POSTINCREMENT:
 971     case UNOP_PREDECREMENT:
 972     case UNOP_POSTDECREMENT:
 973     case UNOP_SIZEOF:
 974     case UNOP_PLUS:
 975     case UNOP_CAP:
 976     case UNOP_CHR:
 977     case UNOP_ORD:
 978     case UNOP_ABS:
 979     case UNOP_FLOAT:
 980     case UNOP_HIGH:
 981     case UNOP_MAX:
 982     case UNOP_MIN:
 983     case UNOP_ODD:
 984     case UNOP_TRUNC:
 985     case UNOP_LOWER:
 986     case UNOP_UPPER:
 987     case UNOP_LENGTH:
 988     case UNOP_CARD:
 989     case UNOP_CHMAX:
 990     case UNOP_CHMIN:
 991       elt = dump_subexp (exp, stream, elt);
 992       break;
 993     case OP_LONG:
 994       fprintf_filtered (stream, "Type @");
 995       gdb_print_host_address (exp->elts[elt].type, stream);
 996       fprintf_filtered (stream, " (");
 997       type_print (exp->elts[elt].type, NULL, stream, 0);
 998       fprintf_filtered (stream, "), value %ld (0x%lx)",
 999                         (long) exp->elts[elt + 1].longconst,
1000                         (long) exp->elts[elt + 1].longconst);
1001       elt += 3;
1002       break;
1003     case OP_DOUBLE:
1004       fprintf_filtered (stream, "Type @");
1005       gdb_print_host_address (exp->elts[elt].type, stream);
1006       fprintf_filtered (stream, " (");
1007       type_print (exp->elts[elt].type, NULL, stream, 0);
1008       fprintf_filtered (stream, "), value %g",
1009                         (double) exp->elts[elt + 1].doubleconst);
1010       elt += 3;
1011       break;
1012     case OP_VAR_VALUE:
1013       fprintf_filtered (stream, "Block @");
1014       gdb_print_host_address (exp->elts[elt].block, stream);
1015       fprintf_filtered (stream, ", symbol @");
1016       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
1017       fprintf_filtered (stream, " (%s)",
1018                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
1019       elt += 3;
1020       break;
1021     case OP_LAST:
1022       fprintf_filtered (stream, "History element %ld",
1023                         (long) exp->elts[elt].longconst);
1024       elt += 2;
1025       break;
1026     case OP_REGISTER:
1027       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
1028       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
1029       break;
1030     case OP_INTERNALVAR:
1031       fprintf_filtered (stream, "Internal var @");
1032       gdb_print_host_address (exp->elts[elt].internalvar, stream);
1033       fprintf_filtered (stream, " (%s)",
1034                         internalvar_name (exp->elts[elt].internalvar));
1035       elt += 2;
1036       break;
1037     case OP_FUNCALL:
1038       {
1039         int i, nargs;
1040
1041         nargs = longest_to_int (exp->elts[elt].longconst);
1042
1043         fprintf_filtered (stream, "Number of args: %d", nargs);
1044         elt += 2;
1045
1046         for (i = 1; i <= nargs + 1; i++)
1047           elt = dump_subexp (exp, stream, elt);
1048       }
1049       break;
1050     case OP_ARRAY:
1051       {
1052         int lower, upper;
1053         int i;
1054
1055         lower = longest_to_int (exp->elts[elt].longconst);
1056         upper = longest_to_int (exp->elts[elt + 1].longconst);
1057
1058         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
1059         elt += 3;
1060
1061         for (i = 1; i <= upper - lower + 1; i++)
1062           elt = dump_subexp (exp, stream, elt);
1063       }
1064       break;
1065     case UNOP_MEMVAL:
1066     case UNOP_CAST:
1067     case UNOP_DYNAMIC_CAST:
1068     case UNOP_REINTERPRET_CAST:
1069       fprintf_filtered (stream, "Type @");
1070       gdb_print_host_address (exp->elts[elt].type, stream);
1071       fprintf_filtered (stream, " (");
1072       type_print (exp->elts[elt].type, NULL, stream, 0);
1073       fprintf_filtered (stream, ")");
1074       elt = dump_subexp (exp, stream, elt + 2);
1075       break;
1076     case UNOP_MEMVAL_TLS:
1077       fprintf_filtered (stream, "TLS type @");
1078       gdb_print_host_address (exp->elts[elt + 1].type, stream);
1079       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
1080                         (exp->elts[elt].objfile == NULL ? "(null)"
1081                          : exp->elts[elt].objfile->name));
1082       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
1083       fprintf_filtered (stream, ")");
1084       elt = dump_subexp (exp, stream, elt + 3);
1085       break;
1086     case OP_TYPE:
1087       fprintf_filtered (stream, "Type @");
1088       gdb_print_host_address (exp->elts[elt].type, stream);
1089       fprintf_filtered (stream, " (");
1090       type_print (exp->elts[elt].type, NULL, stream, 0);
1091       fprintf_filtered (stream, ")");
1092       elt += 2;
1093       break;
1094     case STRUCTOP_STRUCT:
1095     case STRUCTOP_PTR:
1096       {
1097         char *elem_name;
1098         int len;
1099
1100         len = longest_to_int (exp->elts[elt].longconst);
1101         elem_name = &exp->elts[elt + 1].string;
1102
1103         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1104         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1105       }
1106       break;
1107     case OP_SCOPE:
1108       {
1109         char *elem_name;
1110         int len;
1111
1112         fprintf_filtered (stream, "Type @");
1113         gdb_print_host_address (exp->elts[elt].type, stream);
1114         fprintf_filtered (stream, " (");
1115         type_print (exp->elts[elt].type, NULL, stream, 0);
1116         fprintf_filtered (stream, ") ");
1117
1118         len = longest_to_int (exp->elts[elt + 1].longconst);
1119         elem_name = &exp->elts[elt + 2].string;
1120
1121         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1122         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1123       }
1124       break;
1125     default:
1126     case OP_NULL:
1127     case MULTI_SUBSCRIPT:
1128     case OP_F77_UNDETERMINED_ARGLIST:
1129     case OP_COMPLEX:
1130     case OP_STRING:
1131     case OP_BITSTRING:
1132     case OP_BOOL:
1133     case OP_M2_STRING:
1134     case OP_THIS:
1135     case OP_LABELED:
1136     case OP_NAME:
1137       fprintf_filtered (stream, "Unknown format");
1138     }
1139
1140   return elt;
1141 }
1142
1143 void
1144 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1145 {
1146   int elt;
1147
1148   fprintf_filtered (stream, "Dump of expression @ ");
1149   gdb_print_host_address (exp, stream);
1150   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1151   if (exp->elts[0].opcode != OP_TYPE)
1152     print_expression (exp, stream);
1153   else
1154     fputs_filtered ("Type printing not yet supported....", stream);
1155   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1156                     exp->language_defn->la_name, exp->nelts,
1157                     (long) sizeof (union exp_element));
1158   fputs_filtered ("\n", stream);
1159
1160   for (elt = 0; elt < exp->nelts;)
1161     elt = dump_subexp (exp, stream, elt);
1162   fputs_filtered ("\n", stream);
1163 }