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     case TYPE_INSTANCE:
 538       {
 539         LONGEST count = exp->elts[pc + 1].longconst;
 540
 541         /* The COUNT.  */
 542         (*pos)++;
 543         fputs_unfiltered ("TypesInstance(", stream);
 544         while (count-- > 0)
 545           {
 546             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 547             if (count > 0)
 548               fputs_unfiltered (",", stream);
 549           }
 550         fputs_unfiltered (",", stream);
 551         /* Ending COUNT and ending TYPE_INSTANCE.  */
 552         (*pos) += 2;
 553         print_subexp (exp, pos, stream, PREC_PREFIX);
 554         fputs_unfiltered (")", stream);
 555         return;
 556       }
 557
 558       /* Default ops */
 559
 560     default:
 561       op_str = "???";
 562       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 563         if (op_print_tab[tem].opcode == opcode)
 564           {
 565             op_str = op_print_tab[tem].string;
 566             myprec = op_print_tab[tem].precedence;
 567             assoc = op_print_tab[tem].right_assoc;
 568             break;
 569           }
 570       if (op_print_tab[tem].opcode != opcode)
 571         /* Not found; don't try to keep going because we don't know how
 572            to interpret further elements.  For example, this happens
 573            if opcode is OP_TYPE.  */
 574         error (_("Invalid expression"));
 575     }
 576
 577   /* Note that PREC_BUILTIN will always emit parentheses.  */
 578   if ((int) myprec < (int) prec)
 579     fputs_filtered ("(", stream);
 580   if ((int) opcode > (int) BINOP_END)
 581     {
 582       if (assoc)
 583         {
 584           /* Unary postfix operator.  */
 585           print_subexp (exp, pos, stream, PREC_SUFFIX);
 586           fputs_filtered (op_str, stream);
 587         }
 588       else
 589         {
 590           /* Unary prefix operator.  */
 591           fputs_filtered (op_str, stream);
 592           if (myprec == PREC_BUILTIN_FUNCTION)
 593             fputs_filtered ("(", stream);
 594           print_subexp (exp, pos, stream, PREC_PREFIX);
 595           if (myprec == PREC_BUILTIN_FUNCTION)
 596             fputs_filtered (")", stream);
 597         }
 598     }
 599   else
 600     {
 601       /* Binary operator.  */
 602       /* Print left operand.
 603          If operator is right-associative,
 604          increment precedence for this operand.  */
 605       print_subexp (exp, pos, stream,
 606                     (enum precedence) ((int) myprec + assoc));
 607       /* Print the operator itself.  */
 608       if (assign_modify)
 609         fprintf_filtered (stream, " %s= ", op_str);
 610       else if (op_str[0] == ',')
 611         fprintf_filtered (stream, "%s ", op_str);
 612       else
 613         fprintf_filtered (stream, " %s ", op_str);
 614       /* Print right operand.
 615          If operator is left-associative,
 616          increment precedence for this operand.  */
 617       print_subexp (exp, pos, stream,
 618                     (enum precedence) ((int) myprec + !assoc));
 619     }
 620
 621   if ((int) myprec < (int) prec)
 622     fputs_filtered (")", stream);
 623 }
 624
 625 /* Return the operator corresponding to opcode OP as
 626    a string.   NULL indicates that the opcode was not found in the
 627    current language table.  */
 628 char *
 629 op_string (enum exp_opcode op)
 630 {
 631   int tem;
 632   const struct op_print *op_print_tab;
 633
 634   op_print_tab = current_language->la_op_print_tab;
 635   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 636     if (op_print_tab[tem].opcode == op)
 637       return op_print_tab[tem].string;
 638   return NULL;
 639 }
 640
 641 /* Support for dumping the raw data from expressions in a human readable
 642    form.  */
 643
 644 static char *op_name (struct expression *, enum exp_opcode);
 645 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 646
 647 /* Name for OPCODE, when it appears in expression EXP.  */
 648
 649 static char *
 650 op_name (struct expression *exp, enum exp_opcode opcode)
 651 {
 652   return exp->language_defn->la_exp_desc->op_name (opcode);
 653 }
 654
 655 /* Default name for the standard operator OPCODE (i.e., one defined in
 656    the definition of enum exp_opcode).  */
 657
 658 char *
 659 op_name_standard (enum exp_opcode opcode)
 660 {
 661   switch (opcode)
 662     {
 663     default:
 664       {
 665         static char buf[30];
 666
 667         sprintf (buf, "<unknown %d>", opcode);
 668         return buf;
 669       }
 670 #define OP(name)        \
 671     case name:          \
 672       return #name ;
 673 #include "std-operator.def"
 674 #undef OP
 675     }
 676 }
 677
 678 /* Print a raw dump of expression EXP to STREAM.
 679    NOTE, if non-NULL, is printed as extra explanatory text.  */
 680
 681 void
 682 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 683                      char *note)
 684 {
 685   int elt;
 686   char *opcode_name;
 687   char *eltscan;
 688   int eltsize;
 689
 690   fprintf_filtered (stream, "Dump of expression @ ");
 691   gdb_print_host_address (exp, stream);
 692   if (note)
 693     fprintf_filtered (stream, ", %s:", note);
 694   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 695                     exp->language_defn->la_name, exp->nelts,
 696                     (long) sizeof (union exp_element));
 697   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 698                     "Hex Value", "String Value");
 699   for (elt = 0; elt < exp->nelts; elt++)
 700     {
 701       fprintf_filtered (stream, "\t%5d  ", elt);
 702       opcode_name = op_name (exp, exp->elts[elt].opcode);
 703
 704       fprintf_filtered (stream, "%20s  ", opcode_name);
 705       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 706       fprintf_filtered (stream, "  ");
 707
 708       for (eltscan = (char *) &exp->elts[elt],
 709            eltsize = sizeof (union exp_element);
 710            eltsize-- > 0;
 711            eltscan++)
 712         {
 713           fprintf_filtered (stream, "%c",
 714                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 715         }
 716       fprintf_filtered (stream, "\n");
 717     }
 718 }
 719
 720 /* Dump the subexpression of prefix expression EXP whose operator is at
 721    position ELT onto STREAM.  Returns the position of the next
 722    subexpression in EXP.  */
 723
 724 int
 725 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 726 {
 727   static int indent = 0;
 728   int i;
 729
 730   fprintf_filtered (stream, "\n");
 731   fprintf_filtered (stream, "\t%5d  ", elt);
 732
 733   for (i = 1; i <= indent; i++)
 734     fprintf_filtered (stream, " ");
 735   indent += 2;
 736
 737   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 738
 739   elt = dump_subexp_body (exp, stream, elt);
 740
 741   indent -= 2;
 742
 743   return elt;
 744 }
 745
 746 /* Dump the operands of prefix expression EXP whose opcode is at
 747    position ELT onto STREAM.  Returns the position of the next
 748    subexpression in EXP.  */
 749
 750 static int
 751 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 752 {
 753   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 754 }
 755
 756 /* Default value for subexp_body in exp_descriptor vector.  */
 757
 758 int
 759 dump_subexp_body_standard (struct expression *exp,
 760                            struct ui_file *stream, int elt)
 761 {
 762   int opcode = exp->elts[elt++].opcode;
 763
 764   switch (opcode)
 765     {
 766     case TERNOP_COND:
 767     case TERNOP_SLICE:
 768     case TERNOP_SLICE_COUNT:
 769       elt = dump_subexp (exp, stream, elt);
 770     case BINOP_ADD:
 771     case BINOP_SUB:
 772     case BINOP_MUL:
 773     case BINOP_DIV:
 774     case BINOP_REM:
 775     case BINOP_MOD:
 776     case BINOP_LSH:
 777     case BINOP_RSH:
 778     case BINOP_LOGICAL_AND:
 779     case BINOP_LOGICAL_OR:
 780     case BINOP_BITWISE_AND:
 781     case BINOP_BITWISE_IOR:
 782     case BINOP_BITWISE_XOR:
 783     case BINOP_EQUAL:
 784     case BINOP_NOTEQUAL:
 785     case BINOP_LESS:
 786     case BINOP_GTR:
 787     case BINOP_LEQ:
 788     case BINOP_GEQ:
 789     case BINOP_REPEAT:
 790     case BINOP_ASSIGN:
 791     case BINOP_COMMA:
 792     case BINOP_SUBSCRIPT:
 793     case BINOP_EXP:
 794     case BINOP_MIN:
 795     case BINOP_MAX:
 796     case BINOP_INTDIV:
 797     case BINOP_ASSIGN_MODIFY:
 798     case BINOP_VAL:
 799     case BINOP_CONCAT:
 800     case BINOP_IN:
 801     case BINOP_RANGE:
 802     case BINOP_END:
 803     case STRUCTOP_MEMBER:
 804     case STRUCTOP_MPTR:
 805       elt = dump_subexp (exp, stream, elt);
 806     case UNOP_NEG:
 807     case UNOP_LOGICAL_NOT:
 808     case UNOP_COMPLEMENT:
 809     case UNOP_IND:
 810     case UNOP_ADDR:
 811     case UNOP_PREINCREMENT:
 812     case UNOP_POSTINCREMENT:
 813     case UNOP_PREDECREMENT:
 814     case UNOP_POSTDECREMENT:
 815     case UNOP_SIZEOF:
 816     case UNOP_PLUS:
 817     case UNOP_CAP:
 818     case UNOP_CHR:
 819     case UNOP_ORD:
 820     case UNOP_ABS:
 821     case UNOP_FLOAT:
 822     case UNOP_HIGH:
 823     case UNOP_MAX:
 824     case UNOP_MIN:
 825     case UNOP_ODD:
 826     case UNOP_TRUNC:
 827       elt = dump_subexp (exp, stream, elt);
 828       break;
 829     case OP_LONG:
 830       fprintf_filtered (stream, "Type @");
 831       gdb_print_host_address (exp->elts[elt].type, stream);
 832       fprintf_filtered (stream, " (");
 833       type_print (exp->elts[elt].type, NULL, stream, 0);
 834       fprintf_filtered (stream, "), value %ld (0x%lx)",
 835                         (long) exp->elts[elt + 1].longconst,
 836                         (long) exp->elts[elt + 1].longconst);
 837       elt += 3;
 838       break;
 839     case OP_DOUBLE:
 840       fprintf_filtered (stream, "Type @");
 841       gdb_print_host_address (exp->elts[elt].type, stream);
 842       fprintf_filtered (stream, " (");
 843       type_print (exp->elts[elt].type, NULL, stream, 0);
 844       fprintf_filtered (stream, "), value %g",
 845                         (double) exp->elts[elt + 1].doubleconst);
 846       elt += 3;
 847       break;
 848     case OP_VAR_VALUE:
 849       fprintf_filtered (stream, "Block @");
 850       gdb_print_host_address (exp->elts[elt].block, stream);
 851       fprintf_filtered (stream, ", symbol @");
 852       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 853       fprintf_filtered (stream, " (%s)",
 854                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 855       elt += 3;
 856       break;
 857     case OP_LAST:
 858       fprintf_filtered (stream, "History element %ld",
 859                         (long) exp->elts[elt].longconst);
 860       elt += 2;
 861       break;
 862     case OP_REGISTER:
 863       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 864       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 865       break;
 866     case OP_INTERNALVAR:
 867       fprintf_filtered (stream, "Internal var @");
 868       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 869       fprintf_filtered (stream, " (%s)",
 870                         internalvar_name (exp->elts[elt].internalvar));
 871       elt += 2;
 872       break;
 873     case OP_FUNCALL:
 874       {
 875         int i, nargs;
 876
 877         nargs = longest_to_int (exp->elts[elt].longconst);
 878
 879         fprintf_filtered (stream, "Number of args: %d", nargs);
 880         elt += 2;
 881
 882         for (i = 1; i <= nargs + 1; i++)
 883           elt = dump_subexp (exp, stream, elt);
 884       }
 885       break;
 886     case OP_ARRAY:
 887       {
 888         int lower, upper;
 889         int i;
 890
 891         lower = longest_to_int (exp->elts[elt].longconst);
 892         upper = longest_to_int (exp->elts[elt + 1].longconst);
 893
 894         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 895         elt += 3;
 896
 897         for (i = 1; i <= upper - lower + 1; i++)
 898           elt = dump_subexp (exp, stream, elt);
 899       }
 900       break;
 901     case UNOP_MEMVAL:
 902     case UNOP_CAST:
 903     case UNOP_DYNAMIC_CAST:
 904     case UNOP_REINTERPRET_CAST:
 905       fprintf_filtered (stream, "Type @");
 906       gdb_print_host_address (exp->elts[elt].type, stream);
 907       fprintf_filtered (stream, " (");
 908       type_print (exp->elts[elt].type, NULL, stream, 0);
 909       fprintf_filtered (stream, ")");
 910       elt = dump_subexp (exp, stream, elt + 2);
 911       break;
 912     case UNOP_MEMVAL_TLS:
 913       fprintf_filtered (stream, "TLS type @");
 914       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 915       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 916                         (exp->elts[elt].objfile == NULL ? "(null)"
 917                          : exp->elts[elt].objfile->name));
 918       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 919       fprintf_filtered (stream, ")");
 920       elt = dump_subexp (exp, stream, elt + 3);
 921       break;
 922     case OP_TYPE:
 923       fprintf_filtered (stream, "Type @");
 924       gdb_print_host_address (exp->elts[elt].type, stream);
 925       fprintf_filtered (stream, " (");
 926       type_print (exp->elts[elt].type, NULL, stream, 0);
 927       fprintf_filtered (stream, ")");
 928       elt += 2;
 929       break;
 930     case STRUCTOP_STRUCT:
 931     case STRUCTOP_PTR:
 932       {
 933         char *elem_name;
 934         int len;
 935
 936         len = longest_to_int (exp->elts[elt].longconst);
 937         elem_name = &exp->elts[elt + 1].string;
 938
 939         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 940         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 941       }
 942       break;
 943     case OP_SCOPE:
 944       {
 945         char *elem_name;
 946         int len;
 947
 948         fprintf_filtered (stream, "Type @");
 949         gdb_print_host_address (exp->elts[elt].type, stream);
 950         fprintf_filtered (stream, " (");
 951         type_print (exp->elts[elt].type, NULL, stream, 0);
 952         fprintf_filtered (stream, ") ");
 953
 954         len = longest_to_int (exp->elts[elt + 1].longconst);
 955         elem_name = &exp->elts[elt + 2].string;
 956
 957         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
 958         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
 959       }
 960       break;
 961     case TYPE_INSTANCE:
 962       {
 963         char *elem_name;
 964         LONGEST len;
 965
 966         len = exp->elts[elt++].longconst;
 967         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
 968         while (len-- > 0)
 969           {
 970             fprintf_filtered (stream, "Type @");
 971             gdb_print_host_address (exp->elts[elt].type, stream);
 972             fprintf_filtered (stream, " (");
 973             type_print (exp->elts[elt].type, NULL, stream, 0);
 974             fprintf_filtered (stream, ")");
 975             elt++;
 976             if (len > 0)
 977               fputs_filtered (", ", stream);
 978           }
 979         /* Ending LEN and ending TYPE_INSTANCE.  */
 980         elt += 2;
 981         elt = dump_subexp (exp, stream, elt);
 982       }
 983       break;
 984     default:
 985     case OP_NULL:
 986     case MULTI_SUBSCRIPT:
 987     case OP_F77_UNDETERMINED_ARGLIST:
 988     case OP_COMPLEX:
 989     case OP_STRING:
 990     case OP_BITSTRING:
 991     case OP_BOOL:
 992     case OP_M2_STRING:
 993     case OP_THIS:
 994     case OP_LABELED:
 995     case OP_NAME:
 996       fprintf_filtered (stream, "Unknown format");
 997     }
 998
 999   return elt;
1000 }
1001
1002 void
1003 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1004 {
1005   int elt;
1006
1007   fprintf_filtered (stream, "Dump of expression @ ");
1008   gdb_print_host_address (exp, stream);
1009   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1010   if (exp->elts[0].opcode != OP_TYPE)
1011     print_expression (exp, stream);
1012   else
1013     fputs_filtered ("Type printing not yet supported....", stream);
1014   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1015                     exp->language_defn->la_name, exp->nelts,
1016                     (long) sizeof (union exp_element));
1017   fputs_filtered ("\n", stream);
1018
1019   for (elt = 0; elt < exp->nelts;)
1020     elt = dump_subexp (exp, stream, elt);
1021   fputs_filtered ("\n", stream);
1022 }