gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986, 1988-1989, 1991-2000, 2003, 2007-2012 Free
   4    Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "symtab.h"
  23 #include "gdbtypes.h"
  24 #include "expression.h"
  25 #include "value.h"
  26 #include "language.h"
  27 #include "parser-defs.h"
  28 #include "user-regs.h"          /* For user_reg_map_regnum_to_name.  */
  29 #include "target.h"
  30 #include "gdb_string.h"
  31 #include "block.h"
  32 #include "objfiles.h"
  33 #include "gdb_assert.h"
  34 #include "valprint.h"
  35
  36 #include <ctype.h>
  37
  38 void
  39 print_expression (struct expression *exp, struct ui_file *stream)
  40 {
  41   int pc = 0;
  42
  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_TYPE:
  85       (*pos) += 2;
  86       type_print (exp->elts[pc + 1].type, "", stream, 0);
  87       return;
  88
  89     case OP_SCOPE:
  90       myprec = PREC_PREFIX;
  91       assoc = 0;
  92       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  93       fputs_filtered ("::", stream);
  94       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  95       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  96       fputs_filtered (&exp->elts[pc + 3].string, stream);
  97       return;
  98
  99     case OP_LONG:
 100       {
 101         struct value_print_options opts;
 102
 103         get_raw_print_options (&opts);
 104         (*pos) += 3;
 105         value_print (value_from_longest (exp->elts[pc + 1].type,
 106                                          exp->elts[pc + 2].longconst),
 107                      stream, &opts);
 108       }
 109       return;
 110
 111     case OP_DOUBLE:
 112       {
 113         struct value_print_options opts;
 114
 115         get_raw_print_options (&opts);
 116         (*pos) += 3;
 117         value_print (value_from_double (exp->elts[pc + 1].type,
 118                                         exp->elts[pc + 2].doubleconst),
 119                      stream, &opts);
 120       }
 121       return;
 122
 123     case OP_VAR_VALUE:
 124       {
 125         struct block *b;
 126
 127         (*pos) += 3;
 128         b = exp->elts[pc + 1].block;
 129         if (b != NULL
 130             && BLOCK_FUNCTION (b) != NULL
 131             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 132           {
 133             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 134             fputs_filtered ("::", stream);
 135           }
 136         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 137       }
 138       return;
 139
 140     case OP_VAR_ENTRY_VALUE:
 141       {
 142         (*pos) += 2;
 143         fprintf_filtered (stream, "%s@entry",
 144                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 145       }
 146       return;
 147
 148     case OP_LAST:
 149       (*pos) += 2;
 150       fprintf_filtered (stream, "$%d",
 151                         longest_to_int (exp->elts[pc + 1].longconst));
 152       return;
 153
 154     case OP_REGISTER:
 155       {
 156         const char *name = &exp->elts[pc + 2].string;
 157
 158         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 159         fprintf_filtered (stream, "$%s", name);
 160         return;
 161       }
 162
 163     case OP_BOOL:
 164       (*pos) += 2;
 165       fprintf_filtered (stream, "%s",
 166                         longest_to_int (exp->elts[pc + 1].longconst)
 167                         ? "TRUE" : "FALSE");
 168       return;
 169
 170     case OP_INTERNALVAR:
 171       (*pos) += 2;
 172       fprintf_filtered (stream, "$%s",
 173                         internalvar_name (exp->elts[pc + 1].internalvar));
 174       return;
 175
 176     case OP_FUNCALL:
 177       (*pos) += 2;
 178       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 179       print_subexp (exp, pos, stream, PREC_SUFFIX);
 180       fputs_filtered (" (", stream);
 181       for (tem = 0; tem < nargs; tem++)
 182         {
 183           if (tem != 0)
 184             fputs_filtered (", ", stream);
 185           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 186         }
 187       fputs_filtered (")", stream);
 188       return;
 189
 190     case OP_NAME:
 191       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 192       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 193       fputs_filtered (&exp->elts[pc + 2].string, stream);
 194       return;
 195
 196     case OP_STRING:
 197       {
 198         struct value_print_options opts;
 199
 200         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 201         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 202         /* LA_PRINT_STRING will print using the current repeat count threshold.
 203            If necessary, we can temporarily set it to zero, or pass it as an
 204            additional parameter to LA_PRINT_STRING.  -fnf */
 205         get_user_print_options (&opts);
 206         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 207                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 208       }
 209       return;
 210
 211     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 212                                    NSString constant.  */
 213       {
 214         struct value_print_options opts;
 215
 216         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 217         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 218         fputs_filtered ("@\"", stream);
 219         get_user_print_options (&opts);
 220         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 221                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 222         fputs_filtered ("\"", stream);
 223       }
 224       return;
 225
 226     case OP_OBJC_MSGCALL:
 227       {                 /* Objective C message (method) call.  */
 228         char *selector;
 229
 230         (*pos) += 3;
 231         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 232         fprintf_unfiltered (stream, "[");
 233         print_subexp (exp, pos, stream, PREC_SUFFIX);
 234         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 235                                      &selector, 1024, NULL))
 236           {
 237             error (_("bad selector"));
 238             return;
 239           }
 240         if (nargs)
 241           {
 242             char *s, *nextS;
 243
 244             s = alloca (strlen (selector) + 1);
 245             strcpy (s, selector);
 246             for (tem = 0; tem < nargs; tem++)
 247               {
 248                 nextS = strchr (s, ':');
 249                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 250                 *nextS = '\0';
 251                 fprintf_unfiltered (stream, " %s: ", s);
 252                 s = nextS + 1;
 253                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 254               }
 255           }
 256         else
 257           {
 258             fprintf_unfiltered (stream, " %s", selector);
 259           }
 260         fprintf_unfiltered (stream, "]");
 261         /* "selector" was malloc'd by target_read_string.  Free it.  */
 262         xfree (selector);
 263         return;
 264       }
 265
 266     case OP_ARRAY:
 267       (*pos) += 3;
 268       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 269       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 270       nargs++;
 271       tem = 0;
 272       if (exp->elts[pc + 4].opcode == OP_LONG
 273           && exp->elts[pc + 5].type
 274              == builtin_type (exp->gdbarch)->builtin_char
 275           && exp->language_defn->la_language == language_c)
 276         {
 277           /* Attempt to print C character arrays using string syntax.
 278              Walk through the args, picking up one character from each
 279              of the OP_LONG expression elements.  If any array element
 280              does not match our expection of what we should find for
 281              a simple string, revert back to array printing.  Note that
 282              the last expression element is an explicit null terminator
 283              byte, which doesn't get printed.  */
 284           tempstr = alloca (nargs);
 285           pc += 4;
 286           while (tem < nargs)
 287             {
 288               if (exp->elts[pc].opcode != OP_LONG
 289                   || exp->elts[pc + 1].type
 290                      != builtin_type (exp->gdbarch)->builtin_char)
 291                 {
 292                   /* Not a simple array of char, use regular array
 293                      printing.  */
 294                   tem = 0;
 295                   break;
 296                 }
 297               else
 298                 {
 299                   tempstr[tem++] =
 300                     longest_to_int (exp->elts[pc + 2].longconst);
 301                   pc += 4;
 302                 }
 303             }
 304         }
 305       if (tem > 0)
 306         {
 307           struct value_print_options opts;
 308
 309           get_user_print_options (&opts);
 310           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 311                            tempstr, nargs - 1, NULL, 0, &opts);
 312           (*pos) = pc;
 313         }
 314       else
 315         {
 316           fputs_filtered (" {", stream);
 317           for (tem = 0; tem < nargs; tem++)
 318             {
 319               if (tem != 0)
 320                 {
 321                   fputs_filtered (", ", stream);
 322                 }
 323               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 324             }
 325           fputs_filtered ("}", stream);
 326         }
 327       return;
 328
 329     case TERNOP_COND:
 330       if ((int) prec > (int) PREC_COMMA)
 331         fputs_filtered ("(", stream);
 332       /* Print the subexpressions, forcing parentheses
 333          around any binary operations within them.
 334          This is more parentheses than are strictly necessary,
 335          but it looks clearer.  */
 336       print_subexp (exp, pos, stream, PREC_HYPER);
 337       fputs_filtered (" ? ", stream);
 338       print_subexp (exp, pos, stream, PREC_HYPER);
 339       fputs_filtered (" : ", stream);
 340       print_subexp (exp, pos, stream, PREC_HYPER);
 341       if ((int) prec > (int) PREC_COMMA)
 342         fputs_filtered (")", stream);
 343       return;
 344
 345     case TERNOP_SLICE:
 346       print_subexp (exp, pos, stream, PREC_SUFFIX);
 347       fputs_filtered ("(", stream);
 348       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 349       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 350       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 351       fputs_filtered (")", stream);
 352       return;
 353
 354     case STRUCTOP_STRUCT:
 355       tem = longest_to_int (exp->elts[pc + 1].longconst);
 356       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 357       print_subexp (exp, pos, stream, PREC_SUFFIX);
 358       fputs_filtered (".", stream);
 359       fputs_filtered (&exp->elts[pc + 2].string, stream);
 360       return;
 361
 362       /* Will not occur for Modula-2.  */
 363     case STRUCTOP_PTR:
 364       tem = longest_to_int (exp->elts[pc + 1].longconst);
 365       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 366       print_subexp (exp, pos, stream, PREC_SUFFIX);
 367       fputs_filtered ("->", stream);
 368       fputs_filtered (&exp->elts[pc + 2].string, stream);
 369       return;
 370
 371     case STRUCTOP_MEMBER:
 372       print_subexp (exp, pos, stream, PREC_SUFFIX);
 373       fputs_filtered (".*", stream);
 374       print_subexp (exp, pos, stream, PREC_SUFFIX);
 375       return;
 376
 377     case STRUCTOP_MPTR:
 378       print_subexp (exp, pos, stream, PREC_SUFFIX);
 379       fputs_filtered ("->*", stream);
 380       print_subexp (exp, pos, stream, PREC_SUFFIX);
 381       return;
 382
 383     case BINOP_SUBSCRIPT:
 384       print_subexp (exp, pos, stream, PREC_SUFFIX);
 385       fputs_filtered ("[", stream);
 386       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 387       fputs_filtered ("]", stream);
 388       return;
 389
 390     case UNOP_POSTINCREMENT:
 391       print_subexp (exp, pos, stream, PREC_SUFFIX);
 392       fputs_filtered ("++", stream);
 393       return;
 394
 395     case UNOP_POSTDECREMENT:
 396       print_subexp (exp, pos, stream, PREC_SUFFIX);
 397       fputs_filtered ("--", stream);
 398       return;
 399
 400     case UNOP_CAST:
 401       (*pos) += 2;
 402       if ((int) prec > (int) PREC_PREFIX)
 403         fputs_filtered ("(", stream);
 404       fputs_filtered ("(", stream);
 405       type_print (exp->elts[pc + 1].type, "", stream, 0);
 406       fputs_filtered (") ", stream);
 407       print_subexp (exp, pos, stream, PREC_PREFIX);
 408       if ((int) prec > (int) PREC_PREFIX)
 409         fputs_filtered (")", stream);
 410       return;
 411
 412     case UNOP_CAST_TYPE:
 413       if ((int) prec > (int) PREC_PREFIX)
 414         fputs_filtered ("(", stream);
 415       fputs_filtered ("(", stream);
 416       print_subexp (exp, pos, stream, PREC_PREFIX);
 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       print_subexp (exp, pos, stream, PREC_PREFIX);
 429       fputs_filtered ("> (", stream);
 430       print_subexp (exp, pos, stream, PREC_PREFIX);
 431       fputs_filtered (")", stream);
 432       return;
 433
 434     case UNOP_MEMVAL:
 435       (*pos) += 2;
 436       if ((int) prec > (int) PREC_PREFIX)
 437         fputs_filtered ("(", stream);
 438       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 439           && exp->elts[pc + 3].opcode == OP_LONG)
 440         {
 441           struct value_print_options opts;
 442
 443           /* We have a minimal symbol fn, probably.  It's encoded
 444              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 445              Swallow the OP_LONG (including both its opcodes); ignore
 446              its type; print the value in the type of the MEMVAL.  */
 447           (*pos) += 4;
 448           val = value_at_lazy (exp->elts[pc + 1].type,
 449                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 450           get_raw_print_options (&opts);
 451           value_print (val, stream, &opts);
 452         }
 453       else
 454         {
 455           fputs_filtered ("{", stream);
 456           type_print (exp->elts[pc + 1].type, "", stream, 0);
 457           fputs_filtered ("} ", stream);
 458           print_subexp (exp, pos, stream, PREC_PREFIX);
 459         }
 460       if ((int) prec > (int) PREC_PREFIX)
 461         fputs_filtered (")", stream);
 462       return;
 463
 464     case UNOP_MEMVAL_TYPE:
 465       if ((int) prec > (int) PREC_PREFIX)
 466         fputs_filtered ("(", stream);
 467       fputs_filtered ("{", stream);
 468       print_subexp (exp, pos, stream, PREC_PREFIX);
 469       fputs_filtered ("} ", stream);
 470       print_subexp (exp, pos, stream, PREC_PREFIX);
 471       if ((int) prec > (int) PREC_PREFIX)
 472         fputs_filtered (")", stream);
 473       return;
 474
 475     case UNOP_MEMVAL_TLS:
 476       (*pos) += 3;
 477       if ((int) prec > (int) PREC_PREFIX)
 478         fputs_filtered ("(", stream);
 479       fputs_filtered ("{", stream);
 480       type_print (exp->elts[pc + 2].type, "", stream, 0);
 481       fputs_filtered ("} ", stream);
 482       print_subexp (exp, pos, stream, PREC_PREFIX);
 483       if ((int) prec > (int) PREC_PREFIX)
 484         fputs_filtered (")", stream);
 485       return;
 486
 487     case BINOP_ASSIGN_MODIFY:
 488       opcode = exp->elts[pc + 1].opcode;
 489       (*pos) += 2;
 490       myprec = PREC_ASSIGN;
 491       assoc = 1;
 492       assign_modify = 1;
 493       op_str = "???";
 494       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 495         if (op_print_tab[tem].opcode == opcode)
 496           {
 497             op_str = op_print_tab[tem].string;
 498             break;
 499           }
 500       if (op_print_tab[tem].opcode != opcode)
 501         /* Not found; don't try to keep going because we don't know how
 502            to interpret further elements.  */
 503         error (_("Invalid expression"));
 504       break;
 505
 506       /* C++ ops */
 507
 508     case OP_THIS:
 509       ++(*pos);
 510       if (exp->language_defn->la_name_of_this)
 511         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 512       else
 513         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 514                           exp->language_defn->la_name);
 515       return;
 516
 517       /* Modula-2 ops */
 518
 519     case MULTI_SUBSCRIPT:
 520       (*pos) += 2;
 521       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 522       print_subexp (exp, pos, stream, PREC_SUFFIX);
 523       fprintf_unfiltered (stream, " [");
 524       for (tem = 0; tem < nargs; tem++)
 525         {
 526           if (tem != 0)
 527             fprintf_unfiltered (stream, ", ");
 528           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 529         }
 530       fprintf_unfiltered (stream, "]");
 531       return;
 532
 533     case BINOP_VAL:
 534       (*pos) += 2;
 535       fprintf_unfiltered (stream, "VAL(");
 536       type_print (exp->elts[pc + 1].type, "", stream, 0);
 537       fprintf_unfiltered (stream, ",");
 538       print_subexp (exp, pos, stream, PREC_PREFIX);
 539       fprintf_unfiltered (stream, ")");
 540       return;
 541
 542     case TYPE_INSTANCE:
 543       {
 544         LONGEST count = exp->elts[pc + 1].longconst;
 545
 546         /* The COUNT.  */
 547         (*pos)++;
 548         fputs_unfiltered ("TypesInstance(", stream);
 549         while (count-- > 0)
 550           {
 551             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 552             if (count > 0)
 553               fputs_unfiltered (",", stream);
 554           }
 555         fputs_unfiltered (",", stream);
 556         /* Ending COUNT and ending TYPE_INSTANCE.  */
 557         (*pos) += 2;
 558         print_subexp (exp, pos, stream, PREC_PREFIX);
 559         fputs_unfiltered (")", stream);
 560         return;
 561       }
 562
 563       /* Default ops */
 564
 565     default:
 566       op_str = "???";
 567       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 568         if (op_print_tab[tem].opcode == opcode)
 569           {
 570             op_str = op_print_tab[tem].string;
 571             myprec = op_print_tab[tem].precedence;
 572             assoc = op_print_tab[tem].right_assoc;
 573             break;
 574           }
 575       if (op_print_tab[tem].opcode != opcode)
 576         /* Not found; don't try to keep going because we don't know how
 577            to interpret further elements.  For example, this happens
 578            if opcode is OP_TYPE.  */
 579         error (_("Invalid expression"));
 580     }
 581
 582   /* Note that PREC_BUILTIN will always emit parentheses.  */
 583   if ((int) myprec < (int) prec)
 584     fputs_filtered ("(", stream);
 585   if ((int) opcode > (int) BINOP_END)
 586     {
 587       if (assoc)
 588         {
 589           /* Unary postfix operator.  */
 590           print_subexp (exp, pos, stream, PREC_SUFFIX);
 591           fputs_filtered (op_str, stream);
 592         }
 593       else
 594         {
 595           /* Unary prefix operator.  */
 596           fputs_filtered (op_str, stream);
 597           if (myprec == PREC_BUILTIN_FUNCTION)
 598             fputs_filtered ("(", stream);
 599           print_subexp (exp, pos, stream, PREC_PREFIX);
 600           if (myprec == PREC_BUILTIN_FUNCTION)
 601             fputs_filtered (")", stream);
 602         }
 603     }
 604   else
 605     {
 606       /* Binary operator.  */
 607       /* Print left operand.
 608          If operator is right-associative,
 609          increment precedence for this operand.  */
 610       print_subexp (exp, pos, stream,
 611                     (enum precedence) ((int) myprec + assoc));
 612       /* Print the operator itself.  */
 613       if (assign_modify)
 614         fprintf_filtered (stream, " %s= ", op_str);
 615       else if (op_str[0] == ',')
 616         fprintf_filtered (stream, "%s ", op_str);
 617       else
 618         fprintf_filtered (stream, " %s ", op_str);
 619       /* Print right operand.
 620          If operator is left-associative,
 621          increment precedence for this operand.  */
 622       print_subexp (exp, pos, stream,
 623                     (enum precedence) ((int) myprec + !assoc));
 624     }
 625
 626   if ((int) myprec < (int) prec)
 627     fputs_filtered (")", stream);
 628 }
 629
 630 /* Return the operator corresponding to opcode OP as
 631    a string.   NULL indicates that the opcode was not found in the
 632    current language table.  */
 633 char *
 634 op_string (enum exp_opcode op)
 635 {
 636   int tem;
 637   const struct op_print *op_print_tab;
 638
 639   op_print_tab = current_language->la_op_print_tab;
 640   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 641     if (op_print_tab[tem].opcode == op)
 642       return op_print_tab[tem].string;
 643   return NULL;
 644 }
 645
 646 /* Support for dumping the raw data from expressions in a human readable
 647    form.  */
 648
 649 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 650
 651 /* Name for OPCODE, when it appears in expression EXP.  */
 652
 653 char *
 654 op_name (struct expression *exp, enum exp_opcode opcode)
 655 {
 656   return exp->language_defn->la_exp_desc->op_name (opcode);
 657 }
 658
 659 /* Default name for the standard operator OPCODE (i.e., one defined in
 660    the definition of enum exp_opcode).  */
 661
 662 char *
 663 op_name_standard (enum exp_opcode opcode)
 664 {
 665   switch (opcode)
 666     {
 667     default:
 668       {
 669         static char buf[30];
 670
 671         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
 672         return buf;
 673       }
 674 #define OP(name)        \
 675     case name:          \
 676       return #name ;
 677 #include "std-operator.def"
 678 #undef OP
 679     }
 680 }
 681
 682 /* Print a raw dump of expression EXP to STREAM.
 683    NOTE, if non-NULL, is printed as extra explanatory text.  */
 684
 685 void
 686 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 687                      char *note)
 688 {
 689   int elt;
 690   char *opcode_name;
 691   char *eltscan;
 692   int eltsize;
 693
 694   fprintf_filtered (stream, "Dump of expression @ ");
 695   gdb_print_host_address (exp, stream);
 696   if (note)
 697     fprintf_filtered (stream, ", %s:", note);
 698   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 699                     exp->language_defn->la_name, exp->nelts,
 700                     (long) sizeof (union exp_element));
 701   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 702                     "Hex Value", "String Value");
 703   for (elt = 0; elt < exp->nelts; elt++)
 704     {
 705       fprintf_filtered (stream, "\t%5d  ", elt);
 706       opcode_name = op_name (exp, exp->elts[elt].opcode);
 707
 708       fprintf_filtered (stream, "%20s  ", opcode_name);
 709       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 710       fprintf_filtered (stream, "  ");
 711
 712       for (eltscan = (char *) &exp->elts[elt],
 713            eltsize = sizeof (union exp_element);
 714            eltsize-- > 0;
 715            eltscan++)
 716         {
 717           fprintf_filtered (stream, "%c",
 718                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 719         }
 720       fprintf_filtered (stream, "\n");
 721     }
 722 }
 723
 724 /* Dump the subexpression of prefix expression EXP whose operator is at
 725    position ELT onto STREAM.  Returns the position of the next
 726    subexpression in EXP.  */
 727
 728 int
 729 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 730 {
 731   static int indent = 0;
 732   int i;
 733
 734   fprintf_filtered (stream, "\n");
 735   fprintf_filtered (stream, "\t%5d  ", elt);
 736
 737   for (i = 1; i <= indent; i++)
 738     fprintf_filtered (stream, " ");
 739   indent += 2;
 740
 741   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 742
 743   elt = dump_subexp_body (exp, stream, elt);
 744
 745   indent -= 2;
 746
 747   return elt;
 748 }
 749
 750 /* Dump the operands of prefix expression EXP whose opcode is at
 751    position ELT onto STREAM.  Returns the position of the next
 752    subexpression in EXP.  */
 753
 754 static int
 755 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 756 {
 757   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 758 }
 759
 760 /* Default value for subexp_body in exp_descriptor vector.  */
 761
 762 int
 763 dump_subexp_body_standard (struct expression *exp,
 764                            struct ui_file *stream, int elt)
 765 {
 766   int opcode = exp->elts[elt++].opcode;
 767
 768   switch (opcode)
 769     {
 770     case TERNOP_COND:
 771     case TERNOP_SLICE:
 772       elt = dump_subexp (exp, stream, elt);
 773       /* FALL THROUGH */
 774     case BINOP_ADD:
 775     case BINOP_SUB:
 776     case BINOP_MUL:
 777     case BINOP_DIV:
 778     case BINOP_REM:
 779     case BINOP_MOD:
 780     case BINOP_LSH:
 781     case BINOP_RSH:
 782     case BINOP_LOGICAL_AND:
 783     case BINOP_LOGICAL_OR:
 784     case BINOP_BITWISE_AND:
 785     case BINOP_BITWISE_IOR:
 786     case BINOP_BITWISE_XOR:
 787     case BINOP_EQUAL:
 788     case BINOP_NOTEQUAL:
 789     case BINOP_LESS:
 790     case BINOP_GTR:
 791     case BINOP_LEQ:
 792     case BINOP_GEQ:
 793     case BINOP_REPEAT:
 794     case BINOP_ASSIGN:
 795     case BINOP_COMMA:
 796     case BINOP_SUBSCRIPT:
 797     case BINOP_EXP:
 798     case BINOP_MIN:
 799     case BINOP_MAX:
 800     case BINOP_INTDIV:
 801     case BINOP_ASSIGN_MODIFY:
 802     case BINOP_VAL:
 803     case BINOP_CONCAT:
 804     case BINOP_IN:
 805     case BINOP_RANGE:
 806     case BINOP_END:
 807     case STRUCTOP_MEMBER:
 808     case STRUCTOP_MPTR:
 809       elt = dump_subexp (exp, stream, elt);
 810       /* FALL THROUGH */
 811     case UNOP_NEG:
 812     case UNOP_LOGICAL_NOT:
 813     case UNOP_COMPLEMENT:
 814     case UNOP_IND:
 815     case UNOP_ADDR:
 816     case UNOP_PREINCREMENT:
 817     case UNOP_POSTINCREMENT:
 818     case UNOP_PREDECREMENT:
 819     case UNOP_POSTDECREMENT:
 820     case UNOP_SIZEOF:
 821     case UNOP_PLUS:
 822     case UNOP_CAP:
 823     case UNOP_CHR:
 824     case UNOP_ORD:
 825     case UNOP_ABS:
 826     case UNOP_FLOAT:
 827     case UNOP_HIGH:
 828     case UNOP_MAX:
 829     case UNOP_MIN:
 830     case UNOP_ODD:
 831     case UNOP_TRUNC:
 832       elt = dump_subexp (exp, stream, elt);
 833       break;
 834     case OP_LONG:
 835       fprintf_filtered (stream, "Type @");
 836       gdb_print_host_address (exp->elts[elt].type, stream);
 837       fprintf_filtered (stream, " (");
 838       type_print (exp->elts[elt].type, NULL, stream, 0);
 839       fprintf_filtered (stream, "), value %ld (0x%lx)",
 840                         (long) exp->elts[elt + 1].longconst,
 841                         (long) exp->elts[elt + 1].longconst);
 842       elt += 3;
 843       break;
 844     case OP_DOUBLE:
 845       fprintf_filtered (stream, "Type @");
 846       gdb_print_host_address (exp->elts[elt].type, stream);
 847       fprintf_filtered (stream, " (");
 848       type_print (exp->elts[elt].type, NULL, stream, 0);
 849       fprintf_filtered (stream, "), value %g",
 850                         (double) exp->elts[elt + 1].doubleconst);
 851       elt += 3;
 852       break;
 853     case OP_VAR_VALUE:
 854       fprintf_filtered (stream, "Block @");
 855       gdb_print_host_address (exp->elts[elt].block, stream);
 856       fprintf_filtered (stream, ", symbol @");
 857       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 858       fprintf_filtered (stream, " (%s)",
 859                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 860       elt += 3;
 861       break;
 862     case OP_VAR_ENTRY_VALUE:
 863       fprintf_filtered (stream, "Entry value of symbol @");
 864       gdb_print_host_address (exp->elts[elt].symbol, stream);
 865       fprintf_filtered (stream, " (%s)",
 866                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 867       elt += 2;
 868       break;
 869     case OP_LAST:
 870       fprintf_filtered (stream, "History element %ld",
 871                         (long) exp->elts[elt].longconst);
 872       elt += 2;
 873       break;
 874     case OP_REGISTER:
 875       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 876       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 877       break;
 878     case OP_INTERNALVAR:
 879       fprintf_filtered (stream, "Internal var @");
 880       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 881       fprintf_filtered (stream, " (%s)",
 882                         internalvar_name (exp->elts[elt].internalvar));
 883       elt += 2;
 884       break;
 885     case OP_FUNCALL:
 886       {
 887         int i, nargs;
 888
 889         nargs = longest_to_int (exp->elts[elt].longconst);
 890
 891         fprintf_filtered (stream, "Number of args: %d", nargs);
 892         elt += 2;
 893
 894         for (i = 1; i <= nargs + 1; i++)
 895           elt = dump_subexp (exp, stream, elt);
 896       }
 897       break;
 898     case OP_ARRAY:
 899       {
 900         int lower, upper;
 901         int i;
 902
 903         lower = longest_to_int (exp->elts[elt].longconst);
 904         upper = longest_to_int (exp->elts[elt + 1].longconst);
 905
 906         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 907         elt += 3;
 908
 909         for (i = 1; i <= upper - lower + 1; i++)
 910           elt = dump_subexp (exp, stream, elt);
 911       }
 912       break;
 913     case UNOP_DYNAMIC_CAST:
 914     case UNOP_REINTERPRET_CAST:
 915     case UNOP_CAST_TYPE:
 916     case UNOP_MEMVAL_TYPE:
 917       fprintf_filtered (stream, " (");
 918       elt = dump_subexp (exp, stream, elt);
 919       fprintf_filtered (stream, ")");
 920       elt = dump_subexp (exp, stream, elt);
 921       break;
 922     case UNOP_MEMVAL:
 923     case UNOP_CAST:
 924       fprintf_filtered (stream, "Type @");
 925       gdb_print_host_address (exp->elts[elt].type, stream);
 926       fprintf_filtered (stream, " (");
 927       type_print (exp->elts[elt].type, NULL, stream, 0);
 928       fprintf_filtered (stream, ")");
 929       elt = dump_subexp (exp, stream, elt + 2);
 930       break;
 931     case UNOP_MEMVAL_TLS:
 932       fprintf_filtered (stream, "TLS type @");
 933       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 934       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 935                         (exp->elts[elt].objfile == NULL ? "(null)"
 936                          : exp->elts[elt].objfile->name));
 937       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 938       fprintf_filtered (stream, ")");
 939       elt = dump_subexp (exp, stream, elt + 3);
 940       break;
 941     case OP_TYPE:
 942       fprintf_filtered (stream, "Type @");
 943       gdb_print_host_address (exp->elts[elt].type, stream);
 944       fprintf_filtered (stream, " (");
 945       type_print (exp->elts[elt].type, NULL, stream, 0);
 946       fprintf_filtered (stream, ")");
 947       elt += 2;
 948       break;
 949     case OP_TYPEOF:
 950     case OP_DECLTYPE:
 951       fprintf_filtered (stream, "Typeof (");
 952       elt = dump_subexp (exp, stream, elt);
 953       fprintf_filtered (stream, ")");
 954       break;
 955     case STRUCTOP_STRUCT:
 956     case STRUCTOP_PTR:
 957       {
 958         char *elem_name;
 959         int len;
 960
 961         len = longest_to_int (exp->elts[elt].longconst);
 962         elem_name = &exp->elts[elt + 1].string;
 963
 964         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 965         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 966       }
 967       break;
 968     case OP_SCOPE:
 969       {
 970         char *elem_name;
 971         int len;
 972
 973         fprintf_filtered (stream, "Type @");
 974         gdb_print_host_address (exp->elts[elt].type, stream);
 975         fprintf_filtered (stream, " (");
 976         type_print (exp->elts[elt].type, NULL, stream, 0);
 977         fprintf_filtered (stream, ") ");
 978
 979         len = longest_to_int (exp->elts[elt + 1].longconst);
 980         elem_name = &exp->elts[elt + 2].string;
 981
 982         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
 983         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
 984       }
 985       break;
 986     case TYPE_INSTANCE:
 987       {
 988         LONGEST len;
 989
 990         len = exp->elts[elt++].longconst;
 991         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
 992         while (len-- > 0)
 993           {
 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, ")");
 999             elt++;
1000             if (len > 0)
1001               fputs_filtered (", ", stream);
1002           }
1003         /* Ending LEN and ending TYPE_INSTANCE.  */
1004         elt += 2;
1005         elt = dump_subexp (exp, stream, elt);
1006       }
1007       break;
1008     default:
1009     case OP_NULL:
1010     case MULTI_SUBSCRIPT:
1011     case OP_F77_UNDETERMINED_ARGLIST:
1012     case OP_COMPLEX:
1013     case OP_STRING:
1014     case OP_BOOL:
1015     case OP_M2_STRING:
1016     case OP_THIS:
1017     case OP_NAME:
1018       fprintf_filtered (stream, "Unknown format");
1019     }
1020
1021   return elt;
1022 }
1023
1024 void
1025 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1026 {
1027   int elt;
1028
1029   fprintf_filtered (stream, "Dump of expression @ ");
1030   gdb_print_host_address (exp, stream);
1031   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1032   print_expression (exp, stream);
1033   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1034                     exp->language_defn->la_name, exp->nelts,
1035                     (long) sizeof (union exp_element));
1036   fputs_filtered ("\n", stream);
1037
1038   for (elt = 0; elt < exp->nelts;)
1039     elt = dump_subexp (exp, stream, elt);
1040   fputs_filtered ("\n", stream);
1041 }