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       if (exp->language_defn->la_name_of_this)
 503         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 504       else
 505         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 506                           exp->language_defn->la_name);
 507       return;
 508
 509       /* Modula-2 ops */
 510
 511     case MULTI_SUBSCRIPT:
 512       (*pos) += 2;
 513       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 514       print_subexp (exp, pos, stream, PREC_SUFFIX);
 515       fprintf_unfiltered (stream, " [");
 516       for (tem = 0; tem < nargs; tem++)
 517         {
 518           if (tem != 0)
 519             fprintf_unfiltered (stream, ", ");
 520           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 521         }
 522       fprintf_unfiltered (stream, "]");
 523       return;
 524
 525     case BINOP_VAL:
 526       (*pos) += 2;
 527       fprintf_unfiltered (stream, "VAL(");
 528       type_print (exp->elts[pc + 1].type, "", stream, 0);
 529       fprintf_unfiltered (stream, ",");
 530       print_subexp (exp, pos, stream, PREC_PREFIX);
 531       fprintf_unfiltered (stream, ")");
 532       return;
 533
 534     case TYPE_INSTANCE:
 535       {
 536         LONGEST count = exp->elts[pc + 1].longconst;
 537
 538         /* The COUNT.  */
 539         (*pos)++;
 540         fputs_unfiltered ("TypesInstance(", stream);
 541         while (count-- > 0)
 542           {
 543             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 544             if (count > 0)
 545               fputs_unfiltered (",", stream);
 546           }
 547         fputs_unfiltered (",", stream);
 548         /* Ending COUNT and ending TYPE_INSTANCE.  */
 549         (*pos) += 2;
 550         print_subexp (exp, pos, stream, PREC_PREFIX);
 551         fputs_unfiltered (")", stream);
 552         return;
 553       }
 554
 555       /* Default ops */
 556
 557     default:
 558       op_str = "???";
 559       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 560         if (op_print_tab[tem].opcode == opcode)
 561           {
 562             op_str = op_print_tab[tem].string;
 563             myprec = op_print_tab[tem].precedence;
 564             assoc = op_print_tab[tem].right_assoc;
 565             break;
 566           }
 567       if (op_print_tab[tem].opcode != opcode)
 568         /* Not found; don't try to keep going because we don't know how
 569            to interpret further elements.  For example, this happens
 570            if opcode is OP_TYPE.  */
 571         error (_("Invalid expression"));
 572     }
 573
 574   /* Note that PREC_BUILTIN will always emit parentheses.  */
 575   if ((int) myprec < (int) prec)
 576     fputs_filtered ("(", stream);
 577   if ((int) opcode > (int) BINOP_END)
 578     {
 579       if (assoc)
 580         {
 581           /* Unary postfix operator.  */
 582           print_subexp (exp, pos, stream, PREC_SUFFIX);
 583           fputs_filtered (op_str, stream);
 584         }
 585       else
 586         {
 587           /* Unary prefix operator.  */
 588           fputs_filtered (op_str, stream);
 589           if (myprec == PREC_BUILTIN_FUNCTION)
 590             fputs_filtered ("(", stream);
 591           print_subexp (exp, pos, stream, PREC_PREFIX);
 592           if (myprec == PREC_BUILTIN_FUNCTION)
 593             fputs_filtered (")", stream);
 594         }
 595     }
 596   else
 597     {
 598       /* Binary operator.  */
 599       /* Print left operand.
 600          If operator is right-associative,
 601          increment precedence for this operand.  */
 602       print_subexp (exp, pos, stream,
 603                     (enum precedence) ((int) myprec + assoc));
 604       /* Print the operator itself.  */
 605       if (assign_modify)
 606         fprintf_filtered (stream, " %s= ", op_str);
 607       else if (op_str[0] == ',')
 608         fprintf_filtered (stream, "%s ", op_str);
 609       else
 610         fprintf_filtered (stream, " %s ", op_str);
 611       /* Print right operand.
 612          If operator is left-associative,
 613          increment precedence for this operand.  */
 614       print_subexp (exp, pos, stream,
 615                     (enum precedence) ((int) myprec + !assoc));
 616     }
 617
 618   if ((int) myprec < (int) prec)
 619     fputs_filtered (")", stream);
 620 }
 621
 622 /* Return the operator corresponding to opcode OP as
 623    a string.   NULL indicates that the opcode was not found in the
 624    current language table.  */
 625 char *
 626 op_string (enum exp_opcode op)
 627 {
 628   int tem;
 629   const struct op_print *op_print_tab;
 630
 631   op_print_tab = current_language->la_op_print_tab;
 632   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 633     if (op_print_tab[tem].opcode == op)
 634       return op_print_tab[tem].string;
 635   return NULL;
 636 }
 637
 638 /* Support for dumping the raw data from expressions in a human readable
 639    form.  */
 640
 641 static char *op_name (struct expression *, enum exp_opcode);
 642 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 643
 644 /* Name for OPCODE, when it appears in expression EXP.  */
 645
 646 static char *
 647 op_name (struct expression *exp, enum exp_opcode opcode)
 648 {
 649   return exp->language_defn->la_exp_desc->op_name (opcode);
 650 }
 651
 652 /* Default name for the standard operator OPCODE (i.e., one defined in
 653    the definition of enum exp_opcode).  */
 654
 655 char *
 656 op_name_standard (enum exp_opcode opcode)
 657 {
 658   switch (opcode)
 659     {
 660     default:
 661       {
 662         static char buf[30];
 663
 664         sprintf (buf, "<unknown %d>", opcode);
 665         return buf;
 666       }
 667 #define OP(name)        \
 668     case name:          \
 669       return #name ;
 670 #include "std-operator.def"
 671 #undef OP
 672     }
 673 }
 674
 675 /* Print a raw dump of expression EXP to STREAM.
 676    NOTE, if non-NULL, is printed as extra explanatory text.  */
 677
 678 void
 679 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 680                      char *note)
 681 {
 682   int elt;
 683   char *opcode_name;
 684   char *eltscan;
 685   int eltsize;
 686
 687   fprintf_filtered (stream, "Dump of expression @ ");
 688   gdb_print_host_address (exp, stream);
 689   if (note)
 690     fprintf_filtered (stream, ", %s:", note);
 691   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 692                     exp->language_defn->la_name, exp->nelts,
 693                     (long) sizeof (union exp_element));
 694   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 695                     "Hex Value", "String Value");
 696   for (elt = 0; elt < exp->nelts; elt++)
 697     {
 698       fprintf_filtered (stream, "\t%5d  ", elt);
 699       opcode_name = op_name (exp, exp->elts[elt].opcode);
 700
 701       fprintf_filtered (stream, "%20s  ", opcode_name);
 702       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 703       fprintf_filtered (stream, "  ");
 704
 705       for (eltscan = (char *) &exp->elts[elt],
 706            eltsize = sizeof (union exp_element);
 707            eltsize-- > 0;
 708            eltscan++)
 709         {
 710           fprintf_filtered (stream, "%c",
 711                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 712         }
 713       fprintf_filtered (stream, "\n");
 714     }
 715 }
 716
 717 /* Dump the subexpression of prefix expression EXP whose operator is at
 718    position ELT onto STREAM.  Returns the position of the next
 719    subexpression in EXP.  */
 720
 721 int
 722 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 723 {
 724   static int indent = 0;
 725   int i;
 726
 727   fprintf_filtered (stream, "\n");
 728   fprintf_filtered (stream, "\t%5d  ", elt);
 729
 730   for (i = 1; i <= indent; i++)
 731     fprintf_filtered (stream, " ");
 732   indent += 2;
 733
 734   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 735
 736   elt = dump_subexp_body (exp, stream, elt);
 737
 738   indent -= 2;
 739
 740   return elt;
 741 }
 742
 743 /* Dump the operands of prefix expression EXP whose opcode is at
 744    position ELT onto STREAM.  Returns the position of the next
 745    subexpression in EXP.  */
 746
 747 static int
 748 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 749 {
 750   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 751 }
 752
 753 /* Default value for subexp_body in exp_descriptor vector.  */
 754
 755 int
 756 dump_subexp_body_standard (struct expression *exp,
 757                            struct ui_file *stream, int elt)
 758 {
 759   int opcode = exp->elts[elt++].opcode;
 760
 761   switch (opcode)
 762     {
 763     case TERNOP_COND:
 764     case TERNOP_SLICE:
 765     case TERNOP_SLICE_COUNT:
 766       elt = dump_subexp (exp, stream, elt);
 767       /* FALL THROUGH */
 768     case BINOP_ADD:
 769     case BINOP_SUB:
 770     case BINOP_MUL:
 771     case BINOP_DIV:
 772     case BINOP_REM:
 773     case BINOP_MOD:
 774     case BINOP_LSH:
 775     case BINOP_RSH:
 776     case BINOP_LOGICAL_AND:
 777     case BINOP_LOGICAL_OR:
 778     case BINOP_BITWISE_AND:
 779     case BINOP_BITWISE_IOR:
 780     case BINOP_BITWISE_XOR:
 781     case BINOP_EQUAL:
 782     case BINOP_NOTEQUAL:
 783     case BINOP_LESS:
 784     case BINOP_GTR:
 785     case BINOP_LEQ:
 786     case BINOP_GEQ:
 787     case BINOP_REPEAT:
 788     case BINOP_ASSIGN:
 789     case BINOP_COMMA:
 790     case BINOP_SUBSCRIPT:
 791     case BINOP_EXP:
 792     case BINOP_MIN:
 793     case BINOP_MAX:
 794     case BINOP_INTDIV:
 795     case BINOP_ASSIGN_MODIFY:
 796     case BINOP_VAL:
 797     case BINOP_CONCAT:
 798     case BINOP_IN:
 799     case BINOP_RANGE:
 800     case BINOP_END:
 801     case STRUCTOP_MEMBER:
 802     case STRUCTOP_MPTR:
 803       elt = dump_subexp (exp, stream, elt);
 804       /* FALL THROUGH */
 805     case UNOP_NEG:
 806     case UNOP_LOGICAL_NOT:
 807     case UNOP_COMPLEMENT:
 808     case UNOP_IND:
 809     case UNOP_ADDR:
 810     case UNOP_PREINCREMENT:
 811     case UNOP_POSTINCREMENT:
 812     case UNOP_PREDECREMENT:
 813     case UNOP_POSTDECREMENT:
 814     case UNOP_SIZEOF:
 815     case UNOP_PLUS:
 816     case UNOP_CAP:
 817     case UNOP_CHR:
 818     case UNOP_ORD:
 819     case UNOP_ABS:
 820     case UNOP_FLOAT:
 821     case UNOP_HIGH:
 822     case UNOP_MAX:
 823     case UNOP_MIN:
 824     case UNOP_ODD:
 825     case UNOP_TRUNC:
 826       elt = dump_subexp (exp, stream, elt);
 827       break;
 828     case OP_LONG:
 829       fprintf_filtered (stream, "Type @");
 830       gdb_print_host_address (exp->elts[elt].type, stream);
 831       fprintf_filtered (stream, " (");
 832       type_print (exp->elts[elt].type, NULL, stream, 0);
 833       fprintf_filtered (stream, "), value %ld (0x%lx)",
 834                         (long) exp->elts[elt + 1].longconst,
 835                         (long) exp->elts[elt + 1].longconst);
 836       elt += 3;
 837       break;
 838     case OP_DOUBLE:
 839       fprintf_filtered (stream, "Type @");
 840       gdb_print_host_address (exp->elts[elt].type, stream);
 841       fprintf_filtered (stream, " (");
 842       type_print (exp->elts[elt].type, NULL, stream, 0);
 843       fprintf_filtered (stream, "), value %g",
 844                         (double) exp->elts[elt + 1].doubleconst);
 845       elt += 3;
 846       break;
 847     case OP_VAR_VALUE:
 848       fprintf_filtered (stream, "Block @");
 849       gdb_print_host_address (exp->elts[elt].block, stream);
 850       fprintf_filtered (stream, ", symbol @");
 851       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 852       fprintf_filtered (stream, " (%s)",
 853                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 854       elt += 3;
 855       break;
 856     case OP_LAST:
 857       fprintf_filtered (stream, "History element %ld",
 858                         (long) exp->elts[elt].longconst);
 859       elt += 2;
 860       break;
 861     case OP_REGISTER:
 862       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 863       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 864       break;
 865     case OP_INTERNALVAR:
 866       fprintf_filtered (stream, "Internal var @");
 867       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 868       fprintf_filtered (stream, " (%s)",
 869                         internalvar_name (exp->elts[elt].internalvar));
 870       elt += 2;
 871       break;
 872     case OP_FUNCALL:
 873       {
 874         int i, nargs;
 875
 876         nargs = longest_to_int (exp->elts[elt].longconst);
 877
 878         fprintf_filtered (stream, "Number of args: %d", nargs);
 879         elt += 2;
 880
 881         for (i = 1; i <= nargs + 1; i++)
 882           elt = dump_subexp (exp, stream, elt);
 883       }
 884       break;
 885     case OP_ARRAY:
 886       {
 887         int lower, upper;
 888         int i;
 889
 890         lower = longest_to_int (exp->elts[elt].longconst);
 891         upper = longest_to_int (exp->elts[elt + 1].longconst);
 892
 893         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 894         elt += 3;
 895
 896         for (i = 1; i <= upper - lower + 1; i++)
 897           elt = dump_subexp (exp, stream, elt);
 898       }
 899       break;
 900     case UNOP_MEMVAL:
 901     case UNOP_CAST:
 902     case UNOP_DYNAMIC_CAST:
 903     case UNOP_REINTERPRET_CAST:
 904       fprintf_filtered (stream, "Type @");
 905       gdb_print_host_address (exp->elts[elt].type, stream);
 906       fprintf_filtered (stream, " (");
 907       type_print (exp->elts[elt].type, NULL, stream, 0);
 908       fprintf_filtered (stream, ")");
 909       elt = dump_subexp (exp, stream, elt + 2);
 910       break;
 911     case UNOP_MEMVAL_TLS:
 912       fprintf_filtered (stream, "TLS type @");
 913       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 914       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 915                         (exp->elts[elt].objfile == NULL ? "(null)"
 916                          : exp->elts[elt].objfile->name));
 917       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 918       fprintf_filtered (stream, ")");
 919       elt = dump_subexp (exp, stream, elt + 3);
 920       break;
 921     case OP_TYPE:
 922       fprintf_filtered (stream, "Type @");
 923       gdb_print_host_address (exp->elts[elt].type, stream);
 924       fprintf_filtered (stream, " (");
 925       type_print (exp->elts[elt].type, NULL, stream, 0);
 926       fprintf_filtered (stream, ")");
 927       elt += 2;
 928       break;
 929     case STRUCTOP_STRUCT:
 930     case STRUCTOP_PTR:
 931       {
 932         char *elem_name;
 933         int len;
 934
 935         len = longest_to_int (exp->elts[elt].longconst);
 936         elem_name = &exp->elts[elt + 1].string;
 937
 938         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 939         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 940       }
 941       break;
 942     case OP_SCOPE:
 943       {
 944         char *elem_name;
 945         int len;
 946
 947         fprintf_filtered (stream, "Type @");
 948         gdb_print_host_address (exp->elts[elt].type, stream);
 949         fprintf_filtered (stream, " (");
 950         type_print (exp->elts[elt].type, NULL, stream, 0);
 951         fprintf_filtered (stream, ") ");
 952
 953         len = longest_to_int (exp->elts[elt + 1].longconst);
 954         elem_name = &exp->elts[elt + 2].string;
 955
 956         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
 957         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
 958       }
 959       break;
 960     case TYPE_INSTANCE:
 961       {
 962         char *elem_name;
 963         LONGEST len;
 964
 965         len = exp->elts[elt++].longconst;
 966         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
 967         while (len-- > 0)
 968           {
 969             fprintf_filtered (stream, "Type @");
 970             gdb_print_host_address (exp->elts[elt].type, stream);
 971             fprintf_filtered (stream, " (");
 972             type_print (exp->elts[elt].type, NULL, stream, 0);
 973             fprintf_filtered (stream, ")");
 974             elt++;
 975             if (len > 0)
 976               fputs_filtered (", ", stream);
 977           }
 978         /* Ending LEN and ending TYPE_INSTANCE.  */
 979         elt += 2;
 980         elt = dump_subexp (exp, stream, elt);
 981       }
 982       break;
 983     default:
 984     case OP_NULL:
 985     case MULTI_SUBSCRIPT:
 986     case OP_F77_UNDETERMINED_ARGLIST:
 987     case OP_COMPLEX:
 988     case OP_STRING:
 989     case OP_BITSTRING:
 990     case OP_BOOL:
 991     case OP_M2_STRING:
 992     case OP_THIS:
 993     case OP_LABELED:
 994     case OP_NAME:
 995       fprintf_filtered (stream, "Unknown format");
 996     }
 997
 998   return elt;
 999 }
1000
1001 void
1002 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1003 {
1004   int elt;
1005
1006   fprintf_filtered (stream, "Dump of expression @ ");
1007   gdb_print_host_address (exp, stream);
1008   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1009   if (exp->elts[0].opcode != OP_TYPE)
1010     print_expression (exp, stream);
1011   else
1012     fputs_filtered ("Type printing not yet supported....", stream);
1013   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1014                     exp->language_defn->la_name, exp->nelts,
1015                     (long) sizeof (union exp_element));
1016   fputs_filtered ("\n", stream);
1017
1018   for (elt = 0; elt < exp->nelts;)
1019     elt = dump_subexp (exp, stream, elt);
1020   fputs_filtered ("\n", stream);
1021 }