gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   4    1998, 1999, 2000, 2003, 2007, 2008, 2009, 2010
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "symtab.h"
  24 #include "gdbtypes.h"
  25 #include "expression.h"
  26 #include "value.h"
  27 #include "language.h"
  28 #include "parser-defs.h"
  29 #include "user-regs.h"          /* For user_reg_map_regnum_to_name.  */
  30 #include "target.h"
  31 #include "gdb_string.h"
  32 #include "block.h"
  33 #include "objfiles.h"
  34 #include "gdb_assert.h"
  35 #include "valprint.h"
  36
  37 #ifdef HAVE_CTYPE_H
  38 #include <ctype.h>
  39 #endif
  40
  41 void
  42 print_expression (struct expression *exp, struct ui_file *stream)
  43 {
  44   int pc = 0;
  45   print_subexp (exp, &pc, stream, PREC_NULL);
  46 }
  47
  48 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  49    PREC is the precedence of the surrounding operator;
  50    if the precedence of the main operator of this subexpression is less,
  51    parentheses are needed here.  */
  52
  53 void
  54 print_subexp (struct expression *exp, int *pos,
  55               struct ui_file *stream, enum precedence prec)
  56 {
  57   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  58 }
  59
  60 /* Standard implementation of print_subexp for use in language_defn
  61    vectors.  */
  62 void
  63 print_subexp_standard (struct expression *exp, int *pos,
  64                        struct ui_file *stream, enum precedence prec)
  65 {
  66   unsigned tem;
  67   const struct op_print *op_print_tab;
  68   int pc;
  69   unsigned nargs;
  70   char *op_str;
  71   int assign_modify = 0;
  72   enum exp_opcode opcode;
  73   enum precedence myprec = PREC_NULL;
  74   /* Set to 1 for a right-associative operator.  */
  75   int assoc = 0;
  76   struct value *val;
  77   char *tempstr = NULL;
  78
  79   op_print_tab = exp->language_defn->la_op_print_tab;
  80   pc = (*pos)++;
  81   opcode = exp->elts[pc].opcode;
  82   switch (opcode)
  83     {
  84       /* Common ops */
  85
  86     case OP_SCOPE:
  87       myprec = PREC_PREFIX;
  88       assoc = 0;
  89       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  90       fputs_filtered ("::", stream);
  91       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  92       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  93       fputs_filtered (&exp->elts[pc + 3].string, stream);
  94       return;
  95
  96     case OP_LONG:
  97       {
  98         struct value_print_options opts;
  99         get_raw_print_options (&opts);
 100         (*pos) += 3;
 101         value_print (value_from_longest (exp->elts[pc + 1].type,
 102                                          exp->elts[pc + 2].longconst),
 103                      stream, &opts);
 104       }
 105       return;
 106
 107     case OP_DOUBLE:
 108       {
 109         struct value_print_options opts;
 110         get_raw_print_options (&opts);
 111         (*pos) += 3;
 112         value_print (value_from_double (exp->elts[pc + 1].type,
 113                                         exp->elts[pc + 2].doubleconst),
 114                      stream, &opts);
 115       }
 116       return;
 117
 118     case OP_VAR_VALUE:
 119       {
 120         struct block *b;
 121         (*pos) += 3;
 122         b = exp->elts[pc + 1].block;
 123         if (b != NULL
 124             && BLOCK_FUNCTION (b) != NULL
 125             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 126           {
 127             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 128             fputs_filtered ("::", stream);
 129           }
 130         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 131       }
 132       return;
 133
 134     case OP_LAST:
 135       (*pos) += 2;
 136       fprintf_filtered (stream, "$%d",
 137                         longest_to_int (exp->elts[pc + 1].longconst));
 138       return;
 139
 140     case OP_REGISTER:
 141       {
 142         const char *name = &exp->elts[pc + 2].string;
 143         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 144         fprintf_filtered (stream, "$%s", name);
 145         return;
 146       }
 147
 148     case OP_BOOL:
 149       (*pos) += 2;
 150       fprintf_filtered (stream, "%s",
 151                         longest_to_int (exp->elts[pc + 1].longconst)
 152                         ? "TRUE" : "FALSE");
 153       return;
 154
 155     case OP_INTERNALVAR:
 156       (*pos) += 2;
 157       fprintf_filtered (stream, "$%s",
 158                         internalvar_name (exp->elts[pc + 1].internalvar));
 159       return;
 160
 161     case OP_FUNCALL:
 162       (*pos) += 2;
 163       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 164       print_subexp (exp, pos, stream, PREC_SUFFIX);
 165       fputs_filtered (" (", stream);
 166       for (tem = 0; tem < nargs; tem++)
 167         {
 168           if (tem != 0)
 169             fputs_filtered (", ", stream);
 170           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 171         }
 172       fputs_filtered (")", stream);
 173       return;
 174
 175     case OP_NAME:
 176       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 177       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 178       fputs_filtered (&exp->elts[pc + 2].string, stream);
 179       return;
 180
 181     case OP_STRING:
 182       {
 183         struct value_print_options opts;
 184         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 185         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 186         /* LA_PRINT_STRING will print using the current repeat count threshold.
 187            If necessary, we can temporarily set it to zero, or pass it as an
 188            additional parameter to LA_PRINT_STRING.  -fnf */
 189         get_user_print_options (&opts);
 190         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 191                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 192       }
 193       return;
 194
 195     case OP_BITSTRING:
 196       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 197       (*pos)
 198         += 3 + BYTES_TO_EXP_ELEM ((nargs + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
 199       fprintf_unfiltered (stream, "B'<unimplemented>'");
 200       return;
 201
 202     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class NSString constant.  */
 203       {
 204         struct value_print_options opts;
 205         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 206         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 207         fputs_filtered ("@\"", stream);
 208         get_user_print_options (&opts);
 209         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 210                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 211         fputs_filtered ("\"", stream);
 212       }
 213       return;
 214
 215     case OP_OBJC_MSGCALL:
 216       {                 /* Objective C message (method) call.  */
 217         char *selector;
 218         (*pos) += 3;
 219         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 220         fprintf_unfiltered (stream, "[");
 221         print_subexp (exp, pos, stream, PREC_SUFFIX);
 222         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 223                                      &selector, 1024, NULL))
 224           {
 225             error (_("bad selector"));
 226             return;
 227           }
 228         if (nargs)
 229           {
 230             char *s, *nextS;
 231             s = alloca (strlen (selector) + 1);
 232             strcpy (s, selector);
 233             for (tem = 0; tem < nargs; tem++)
 234               {
 235                 nextS = strchr (s, ':');
 236                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 237                 *nextS = '\0';
 238                 fprintf_unfiltered (stream, " %s: ", s);
 239                 s = nextS + 1;
 240                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 241               }
 242           }
 243         else
 244           {
 245             fprintf_unfiltered (stream, " %s", selector);
 246           }
 247         fprintf_unfiltered (stream, "]");
 248         /* "selector" was malloc'd by target_read_string. Free it.  */
 249         xfree (selector);
 250         return;
 251       }
 252
 253     case OP_ARRAY:
 254       (*pos) += 3;
 255       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 256       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 257       nargs++;
 258       tem = 0;
 259       if (exp->elts[pc + 4].opcode == OP_LONG
 260           && exp->elts[pc + 5].type
 261              == builtin_type (exp->gdbarch)->builtin_char
 262           && exp->language_defn->la_language == language_c)
 263         {
 264           /* Attempt to print C character arrays using string syntax.
 265              Walk through the args, picking up one character from each
 266              of the OP_LONG expression elements.  If any array element
 267              does not match our expection of what we should find for
 268              a simple string, revert back to array printing.  Note that
 269              the last expression element is an explicit null terminator
 270              byte, which doesn't get printed. */
 271           tempstr = alloca (nargs);
 272           pc += 4;
 273           while (tem < nargs)
 274             {
 275               if (exp->elts[pc].opcode != OP_LONG
 276                   || exp->elts[pc + 1].type
 277                      != builtin_type (exp->gdbarch)->builtin_char)
 278                 {
 279                   /* Not a simple array of char, use regular array printing. */
 280                   tem = 0;
 281                   break;
 282                 }
 283               else
 284                 {
 285                   tempstr[tem++] =
 286                     longest_to_int (exp->elts[pc + 2].longconst);
 287                   pc += 4;
 288                 }
 289             }
 290         }
 291       if (tem > 0)
 292         {
 293           struct value_print_options opts;
 294           get_user_print_options (&opts);
 295           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 296                            tempstr, nargs - 1, NULL, 0, &opts);
 297           (*pos) = pc;
 298         }
 299       else
 300         {
 301           fputs_filtered (" {", stream);
 302           for (tem = 0; tem < nargs; tem++)
 303             {
 304               if (tem != 0)
 305                 {
 306                   fputs_filtered (", ", stream);
 307                 }
 308               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 309             }
 310           fputs_filtered ("}", stream);
 311         }
 312       return;
 313
 314     case OP_LABELED:
 315       tem = longest_to_int (exp->elts[pc + 1].longconst);
 316       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 317       /* Gcc support both these syntaxes.  Unsure which is preferred.  */
 318 #if 1
 319       fputs_filtered (&exp->elts[pc + 2].string, stream);
 320       fputs_filtered (": ", stream);
 321 #else
 322       fputs_filtered (".", stream);
 323       fputs_filtered (&exp->elts[pc + 2].string, stream);
 324       fputs_filtered ("=", stream);
 325 #endif
 326       print_subexp (exp, pos, stream, PREC_SUFFIX);
 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     case TERNOP_SLICE_COUNT:
 347       print_subexp (exp, pos, stream, PREC_SUFFIX);
 348       fputs_filtered ("(", stream);
 349       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 350       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 351       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 352       fputs_filtered (")", stream);
 353       return;
 354
 355     case STRUCTOP_STRUCT:
 356       tem = longest_to_int (exp->elts[pc + 1].longconst);
 357       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 358       print_subexp (exp, pos, stream, PREC_SUFFIX);
 359       fputs_filtered (".", stream);
 360       fputs_filtered (&exp->elts[pc + 2].string, stream);
 361       return;
 362
 363       /* Will not occur for Modula-2 */
 364     case STRUCTOP_PTR:
 365       tem = longest_to_int (exp->elts[pc + 1].longconst);
 366       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 367       print_subexp (exp, pos, stream, PREC_SUFFIX);
 368       fputs_filtered ("->", stream);
 369       fputs_filtered (&exp->elts[pc + 2].string, stream);
 370       return;
 371
 372     case STRUCTOP_MEMBER:
 373       print_subexp (exp, pos, stream, PREC_SUFFIX);
 374       fputs_filtered (".*", stream);
 375       print_subexp (exp, pos, stream, PREC_SUFFIX);
 376       return;
 377
 378     case STRUCTOP_MPTR:
 379       print_subexp (exp, pos, stream, PREC_SUFFIX);
 380       fputs_filtered ("->*", stream);
 381       print_subexp (exp, pos, stream, PREC_SUFFIX);
 382       return;
 383
 384     case BINOP_SUBSCRIPT:
 385       print_subexp (exp, pos, stream, PREC_SUFFIX);
 386       fputs_filtered ("[", stream);
 387       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 388       fputs_filtered ("]", stream);
 389       return;
 390
 391     case UNOP_POSTINCREMENT:
 392       print_subexp (exp, pos, stream, PREC_SUFFIX);
 393       fputs_filtered ("++", stream);
 394       return;
 395
 396     case UNOP_POSTDECREMENT:
 397       print_subexp (exp, pos, stream, PREC_SUFFIX);
 398       fputs_filtered ("--", stream);
 399       return;
 400
 401     case UNOP_CAST:
 402       (*pos) += 2;
 403       if ((int) prec > (int) PREC_PREFIX)
 404         fputs_filtered ("(", stream);
 405       fputs_filtered ("(", stream);
 406       type_print (exp->elts[pc + 1].type, "", stream, 0);
 407       fputs_filtered (") ", stream);
 408       print_subexp (exp, pos, stream, PREC_PREFIX);
 409       if ((int) prec > (int) PREC_PREFIX)
 410         fputs_filtered (")", stream);
 411       return;
 412
 413     case UNOP_DYNAMIC_CAST:
 414     case UNOP_REINTERPRET_CAST:
 415       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 416                       : "reinterpret_cast", stream);
 417       fputs_filtered ("<", stream);
 418       (*pos) += 2;
 419       type_print (exp->elts[pc + 1].type, "", stream, 0);
 420       fputs_filtered ("> (", stream);
 421       print_subexp (exp, pos, stream, PREC_PREFIX);
 422       fputs_filtered (")", stream);
 423       return;
 424
 425     case UNOP_MEMVAL:
 426       (*pos) += 2;
 427       if ((int) prec > (int) PREC_PREFIX)
 428         fputs_filtered ("(", stream);
 429       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 430           && exp->elts[pc + 3].opcode == OP_LONG)
 431         {
 432           struct value_print_options opts;
 433
 434           /* We have a minimal symbol fn, probably.  It's encoded
 435              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 436              Swallow the OP_LONG (including both its opcodes); ignore
 437              its type; print the value in the type of the MEMVAL.  */
 438           (*pos) += 4;
 439           val = value_at_lazy (exp->elts[pc + 1].type,
 440                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 441           get_raw_print_options (&opts);
 442           value_print (val, stream, &opts);
 443         }
 444       else
 445         {
 446           fputs_filtered ("{", stream);
 447           type_print (exp->elts[pc + 1].type, "", stream, 0);
 448           fputs_filtered ("} ", stream);
 449           print_subexp (exp, pos, stream, PREC_PREFIX);
 450         }
 451       if ((int) prec > (int) PREC_PREFIX)
 452         fputs_filtered (")", stream);
 453       return;
 454
 455     case UNOP_MEMVAL_TLS:
 456       (*pos) += 3;
 457       if ((int) prec > (int) PREC_PREFIX)
 458         fputs_filtered ("(", stream);
 459       fputs_filtered ("{", stream);
 460       type_print (exp->elts[pc + 2].type, "", stream, 0);
 461       fputs_filtered ("} ", stream);
 462       print_subexp (exp, pos, stream, PREC_PREFIX);
 463       if ((int) prec > (int) PREC_PREFIX)
 464         fputs_filtered (")", stream);
 465       return;
 466
 467     case BINOP_ASSIGN_MODIFY:
 468       opcode = exp->elts[pc + 1].opcode;
 469       (*pos) += 2;
 470       myprec = PREC_ASSIGN;
 471       assoc = 1;
 472       assign_modify = 1;
 473       op_str = "???";
 474       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 475         if (op_print_tab[tem].opcode == opcode)
 476           {
 477             op_str = op_print_tab[tem].string;
 478             break;
 479           }
 480       if (op_print_tab[tem].opcode != opcode)
 481         /* Not found; don't try to keep going because we don't know how
 482            to interpret further elements.  */
 483         error (_("Invalid expression"));
 484       break;
 485
 486       /* C++ ops */
 487
 488     case OP_THIS:
 489       ++(*pos);
 490       fputs_filtered ("this", stream);
 491       return;
 492
 493       /* Objective-C ops */
 494
 495     case OP_OBJC_SELF:
 496       ++(*pos);
 497       fputs_filtered ("self", stream);  /* The ObjC equivalent of "this".  */
 498       return;
 499
 500       /* Modula-2 ops */
 501
 502     case MULTI_SUBSCRIPT:
 503       (*pos) += 2;
 504       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 505       print_subexp (exp, pos, stream, PREC_SUFFIX);
 506       fprintf_unfiltered (stream, " [");
 507       for (tem = 0; tem < nargs; tem++)
 508         {
 509           if (tem != 0)
 510             fprintf_unfiltered (stream, ", ");
 511           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 512         }
 513       fprintf_unfiltered (stream, "]");
 514       return;
 515
 516     case BINOP_VAL:
 517       (*pos) += 2;
 518       fprintf_unfiltered (stream, "VAL(");
 519       type_print (exp->elts[pc + 1].type, "", stream, 0);
 520       fprintf_unfiltered (stream, ",");
 521       print_subexp (exp, pos, stream, PREC_PREFIX);
 522       fprintf_unfiltered (stream, ")");
 523       return;
 524
 525     case BINOP_INCL:
 526     case BINOP_EXCL:
 527       error (_("print_subexp:  Not implemented."));
 528
 529       /* Default ops */
 530
 531     default:
 532       op_str = "???";
 533       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 534         if (op_print_tab[tem].opcode == opcode)
 535           {
 536             op_str = op_print_tab[tem].string;
 537             myprec = op_print_tab[tem].precedence;
 538             assoc = op_print_tab[tem].right_assoc;
 539             break;
 540           }
 541       if (op_print_tab[tem].opcode != opcode)
 542         /* Not found; don't try to keep going because we don't know how
 543            to interpret further elements.  For example, this happens
 544            if opcode is OP_TYPE.  */
 545         error (_("Invalid expression"));
 546     }
 547
 548   /* Note that PREC_BUILTIN will always emit parentheses. */
 549   if ((int) myprec < (int) prec)
 550     fputs_filtered ("(", stream);
 551   if ((int) opcode > (int) BINOP_END)
 552     {
 553       if (assoc)
 554         {
 555           /* Unary postfix operator.  */
 556           print_subexp (exp, pos, stream, PREC_SUFFIX);
 557           fputs_filtered (op_str, stream);
 558         }
 559       else
 560         {
 561           /* Unary prefix operator.  */
 562           fputs_filtered (op_str, stream);
 563           if (myprec == PREC_BUILTIN_FUNCTION)
 564             fputs_filtered ("(", stream);
 565           print_subexp (exp, pos, stream, PREC_PREFIX);
 566           if (myprec == PREC_BUILTIN_FUNCTION)
 567             fputs_filtered (")", stream);
 568         }
 569     }
 570   else
 571     {
 572       /* Binary operator.  */
 573       /* Print left operand.
 574          If operator is right-associative,
 575          increment precedence for this operand.  */
 576       print_subexp (exp, pos, stream,
 577                     (enum precedence) ((int) myprec + assoc));
 578       /* Print the operator itself.  */
 579       if (assign_modify)
 580         fprintf_filtered (stream, " %s= ", op_str);
 581       else if (op_str[0] == ',')
 582         fprintf_filtered (stream, "%s ", op_str);
 583       else
 584         fprintf_filtered (stream, " %s ", op_str);
 585       /* Print right operand.
 586          If operator is left-associative,
 587          increment precedence for this operand.  */
 588       print_subexp (exp, pos, stream,
 589                     (enum precedence) ((int) myprec + !assoc));
 590     }
 591
 592   if ((int) myprec < (int) prec)
 593     fputs_filtered (")", stream);
 594 }
 595
 596 /* Return the operator corresponding to opcode OP as
 597    a string.   NULL indicates that the opcode was not found in the
 598    current language table.  */
 599 char *
 600 op_string (enum exp_opcode op)
 601 {
 602   int tem;
 603   const struct op_print *op_print_tab;
 604
 605   op_print_tab = current_language->la_op_print_tab;
 606   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 607     if (op_print_tab[tem].opcode == op)
 608       return op_print_tab[tem].string;
 609   return NULL;
 610 }
 611
 612 /* Support for dumping the raw data from expressions in a human readable
 613    form.  */
 614
 615 static char *op_name (struct expression *, enum exp_opcode);
 616 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 617
 618 /* Name for OPCODE, when it appears in expression EXP. */
 619
 620 static char *
 621 op_name (struct expression *exp, enum exp_opcode opcode)
 622 {
 623   return exp->language_defn->la_exp_desc->op_name (opcode);
 624 }
 625
 626 /* Default name for the standard operator OPCODE (i.e., one defined in
 627    the definition of enum exp_opcode).  */
 628
 629 char *
 630 op_name_standard (enum exp_opcode opcode)
 631 {
 632   switch (opcode)
 633     {
 634     default:
 635       {
 636         static char buf[30];
 637
 638         sprintf (buf, "<unknown %d>", opcode);
 639         return buf;
 640       }
 641     case OP_NULL:
 642       return "OP_NULL";
 643     case BINOP_ADD:
 644       return "BINOP_ADD";
 645     case BINOP_SUB:
 646       return "BINOP_SUB";
 647     case BINOP_MUL:
 648       return "BINOP_MUL";
 649     case BINOP_DIV:
 650       return "BINOP_DIV";
 651     case BINOP_REM:
 652       return "BINOP_REM";
 653     case BINOP_MOD:
 654       return "BINOP_MOD";
 655     case BINOP_LSH:
 656       return "BINOP_LSH";
 657     case BINOP_RSH:
 658       return "BINOP_RSH";
 659     case BINOP_LOGICAL_AND:
 660       return "BINOP_LOGICAL_AND";
 661     case BINOP_LOGICAL_OR:
 662       return "BINOP_LOGICAL_OR";
 663     case BINOP_BITWISE_AND:
 664       return "BINOP_BITWISE_AND";
 665     case BINOP_BITWISE_IOR:
 666       return "BINOP_BITWISE_IOR";
 667     case BINOP_BITWISE_XOR:
 668       return "BINOP_BITWISE_XOR";
 669     case BINOP_EQUAL:
 670       return "BINOP_EQUAL";
 671     case BINOP_NOTEQUAL:
 672       return "BINOP_NOTEQUAL";
 673     case BINOP_LESS:
 674       return "BINOP_LESS";
 675     case BINOP_GTR:
 676       return "BINOP_GTR";
 677     case BINOP_LEQ:
 678       return "BINOP_LEQ";
 679     case BINOP_GEQ:
 680       return "BINOP_GEQ";
 681     case BINOP_REPEAT:
 682       return "BINOP_REPEAT";
 683     case BINOP_ASSIGN:
 684       return "BINOP_ASSIGN";
 685     case BINOP_COMMA:
 686       return "BINOP_COMMA";
 687     case BINOP_SUBSCRIPT:
 688       return "BINOP_SUBSCRIPT";
 689     case MULTI_SUBSCRIPT:
 690       return "MULTI_SUBSCRIPT";
 691     case BINOP_EXP:
 692       return "BINOP_EXP";
 693     case BINOP_MIN:
 694       return "BINOP_MIN";
 695     case BINOP_MAX:
 696       return "BINOP_MAX";
 697     case STRUCTOP_MEMBER:
 698       return "STRUCTOP_MEMBER";
 699     case STRUCTOP_MPTR:
 700       return "STRUCTOP_MPTR";
 701     case BINOP_INTDIV:
 702       return "BINOP_INTDIV";
 703     case BINOP_ASSIGN_MODIFY:
 704       return "BINOP_ASSIGN_MODIFY";
 705     case BINOP_VAL:
 706       return "BINOP_VAL";
 707     case BINOP_INCL:
 708       return "BINOP_INCL";
 709     case BINOP_EXCL:
 710       return "BINOP_EXCL";
 711     case BINOP_CONCAT:
 712       return "BINOP_CONCAT";
 713     case BINOP_RANGE:
 714       return "BINOP_RANGE";
 715     case BINOP_END:
 716       return "BINOP_END";
 717     case TERNOP_COND:
 718       return "TERNOP_COND";
 719     case TERNOP_SLICE:
 720       return "TERNOP_SLICE";
 721     case TERNOP_SLICE_COUNT:
 722       return "TERNOP_SLICE_COUNT";
 723     case OP_LONG:
 724       return "OP_LONG";
 725     case OP_DOUBLE:
 726       return "OP_DOUBLE";
 727     case OP_VAR_VALUE:
 728       return "OP_VAR_VALUE";
 729     case OP_LAST:
 730       return "OP_LAST";
 731     case OP_REGISTER:
 732       return "OP_REGISTER";
 733     case OP_INTERNALVAR:
 734       return "OP_INTERNALVAR";
 735     case OP_FUNCALL:
 736       return "OP_FUNCALL";
 737     case OP_STRING:
 738       return "OP_STRING";
 739     case OP_BITSTRING:
 740       return "OP_BITSTRING";
 741     case OP_ARRAY:
 742       return "OP_ARRAY";
 743     case UNOP_CAST:
 744       return "UNOP_CAST";
 745     case UNOP_DYNAMIC_CAST:
 746       return "UNOP_DYNAMIC_CAST";
 747     case UNOP_REINTERPRET_CAST:
 748       return "UNOP_REINTERPRET_CAST";
 749     case UNOP_MEMVAL:
 750       return "UNOP_MEMVAL";
 751     case UNOP_MEMVAL_TLS:
 752       return "UNOP_MEMVAL_TLS";
 753     case UNOP_NEG:
 754       return "UNOP_NEG";
 755     case UNOP_LOGICAL_NOT:
 756       return "UNOP_LOGICAL_NOT";
 757     case UNOP_COMPLEMENT:
 758       return "UNOP_COMPLEMENT";
 759     case UNOP_IND:
 760       return "UNOP_IND";
 761     case UNOP_ADDR:
 762       return "UNOP_ADDR";
 763     case UNOP_PREINCREMENT:
 764       return "UNOP_PREINCREMENT";
 765     case UNOP_POSTINCREMENT:
 766       return "UNOP_POSTINCREMENT";
 767     case UNOP_PREDECREMENT:
 768       return "UNOP_PREDECREMENT";
 769     case UNOP_POSTDECREMENT:
 770       return "UNOP_POSTDECREMENT";
 771     case UNOP_SIZEOF:
 772       return "UNOP_SIZEOF";
 773     case UNOP_LOWER:
 774       return "UNOP_LOWER";
 775     case UNOP_UPPER:
 776       return "UNOP_UPPER";
 777     case UNOP_LENGTH:
 778       return "UNOP_LENGTH";
 779     case UNOP_PLUS:
 780       return "UNOP_PLUS";
 781     case UNOP_CAP:
 782       return "UNOP_CAP";
 783     case UNOP_CHR:
 784       return "UNOP_CHR";
 785     case UNOP_ORD:
 786       return "UNOP_ORD";
 787     case UNOP_ABS:
 788       return "UNOP_ABS";
 789     case UNOP_FLOAT:
 790       return "UNOP_FLOAT";
 791     case UNOP_HIGH:
 792       return "UNOP_HIGH";
 793     case UNOP_MAX:
 794       return "UNOP_MAX";
 795     case UNOP_MIN:
 796       return "UNOP_MIN";
 797     case UNOP_ODD:
 798       return "UNOP_ODD";
 799     case UNOP_TRUNC:
 800       return "UNOP_TRUNC";
 801     case OP_BOOL:
 802       return "OP_BOOL";
 803     case OP_M2_STRING:
 804       return "OP_M2_STRING";
 805     case STRUCTOP_STRUCT:
 806       return "STRUCTOP_STRUCT";
 807     case STRUCTOP_PTR:
 808       return "STRUCTOP_PTR";
 809     case OP_THIS:
 810       return "OP_THIS";
 811     case OP_OBJC_SELF:
 812       return "OP_OBJC_SELF";
 813     case OP_SCOPE:
 814       return "OP_SCOPE";
 815     case OP_TYPE:
 816       return "OP_TYPE";
 817     case OP_LABELED:
 818       return "OP_LABELED";
 819     }
 820 }
 821
 822 /* Print a raw dump of expression EXP to STREAM.
 823    NOTE, if non-NULL, is printed as extra explanatory text.  */
 824
 825 void
 826 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 827                      char *note)
 828 {
 829   int elt;
 830   char *opcode_name;
 831   char *eltscan;
 832   int eltsize;
 833
 834   fprintf_filtered (stream, "Dump of expression @ ");
 835   gdb_print_host_address (exp, stream);
 836   if (note)
 837     fprintf_filtered (stream, ", %s:", note);
 838   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 839                     exp->language_defn->la_name, exp->nelts,
 840                     (long) sizeof (union exp_element));
 841   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 842                     "Hex Value", "String Value");
 843   for (elt = 0; elt < exp->nelts; elt++)
 844     {
 845       fprintf_filtered (stream, "\t%5d  ", elt);
 846       opcode_name = op_name (exp, exp->elts[elt].opcode);
 847
 848       fprintf_filtered (stream, "%20s  ", opcode_name);
 849       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 850       fprintf_filtered (stream, "  ");
 851
 852       for (eltscan = (char *) &exp->elts[elt],
 853            eltsize = sizeof (union exp_element);
 854            eltsize-- > 0;
 855            eltscan++)
 856         {
 857           fprintf_filtered (stream, "%c",
 858                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 859         }
 860       fprintf_filtered (stream, "\n");
 861     }
 862 }
 863
 864 /* Dump the subexpression of prefix expression EXP whose operator is at
 865    position ELT onto STREAM.  Returns the position of the next
 866    subexpression in EXP.  */
 867
 868 int
 869 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 870 {
 871   static int indent = 0;
 872   int i;
 873
 874   fprintf_filtered (stream, "\n");
 875   fprintf_filtered (stream, "\t%5d  ", elt);
 876
 877   for (i = 1; i <= indent; i++)
 878     fprintf_filtered (stream, " ");
 879   indent += 2;
 880
 881   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 882
 883   elt = dump_subexp_body (exp, stream, elt);
 884
 885   indent -= 2;
 886
 887   return elt;
 888 }
 889
 890 /* Dump the operands of prefix expression EXP whose opcode is at
 891    position ELT onto STREAM.  Returns the position of the next
 892    subexpression in EXP.  */
 893
 894 static int
 895 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 896 {
 897   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 898 }
 899
 900 /* Default value for subexp_body in exp_descriptor vector.  */
 901
 902 int
 903 dump_subexp_body_standard (struct expression *exp,
 904                            struct ui_file *stream, int elt)
 905 {
 906   int opcode = exp->elts[elt++].opcode;
 907
 908   switch (opcode)
 909     {
 910     case TERNOP_COND:
 911     case TERNOP_SLICE:
 912     case TERNOP_SLICE_COUNT:
 913       elt = dump_subexp (exp, stream, elt);
 914     case BINOP_ADD:
 915     case BINOP_SUB:
 916     case BINOP_MUL:
 917     case BINOP_DIV:
 918     case BINOP_REM:
 919     case BINOP_MOD:
 920     case BINOP_LSH:
 921     case BINOP_RSH:
 922     case BINOP_LOGICAL_AND:
 923     case BINOP_LOGICAL_OR:
 924     case BINOP_BITWISE_AND:
 925     case BINOP_BITWISE_IOR:
 926     case BINOP_BITWISE_XOR:
 927     case BINOP_EQUAL:
 928     case BINOP_NOTEQUAL:
 929     case BINOP_LESS:
 930     case BINOP_GTR:
 931     case BINOP_LEQ:
 932     case BINOP_GEQ:
 933     case BINOP_REPEAT:
 934     case BINOP_ASSIGN:
 935     case BINOP_COMMA:
 936     case BINOP_SUBSCRIPT:
 937     case BINOP_EXP:
 938     case BINOP_MIN:
 939     case BINOP_MAX:
 940     case BINOP_INTDIV:
 941     case BINOP_ASSIGN_MODIFY:
 942     case BINOP_VAL:
 943     case BINOP_INCL:
 944     case BINOP_EXCL:
 945     case BINOP_CONCAT:
 946     case BINOP_IN:
 947     case BINOP_RANGE:
 948     case BINOP_END:
 949     case STRUCTOP_MEMBER:
 950     case STRUCTOP_MPTR:
 951       elt = dump_subexp (exp, stream, elt);
 952     case UNOP_NEG:
 953     case UNOP_LOGICAL_NOT:
 954     case UNOP_COMPLEMENT:
 955     case UNOP_IND:
 956     case UNOP_ADDR:
 957     case UNOP_PREINCREMENT:
 958     case UNOP_POSTINCREMENT:
 959     case UNOP_PREDECREMENT:
 960     case UNOP_POSTDECREMENT:
 961     case UNOP_SIZEOF:
 962     case UNOP_PLUS:
 963     case UNOP_CAP:
 964     case UNOP_CHR:
 965     case UNOP_ORD:
 966     case UNOP_ABS:
 967     case UNOP_FLOAT:
 968     case UNOP_HIGH:
 969     case UNOP_MAX:
 970     case UNOP_MIN:
 971     case UNOP_ODD:
 972     case UNOP_TRUNC:
 973     case UNOP_LOWER:
 974     case UNOP_UPPER:
 975     case UNOP_LENGTH:
 976     case UNOP_CARD:
 977     case UNOP_CHMAX:
 978     case UNOP_CHMIN:
 979       elt = dump_subexp (exp, stream, elt);
 980       break;
 981     case OP_LONG:
 982       fprintf_filtered (stream, "Type @");
 983       gdb_print_host_address (exp->elts[elt].type, stream);
 984       fprintf_filtered (stream, " (");
 985       type_print (exp->elts[elt].type, NULL, stream, 0);
 986       fprintf_filtered (stream, "), value %ld (0x%lx)",
 987                         (long) exp->elts[elt + 1].longconst,
 988                         (long) exp->elts[elt + 1].longconst);
 989       elt += 3;
 990       break;
 991     case OP_DOUBLE:
 992       fprintf_filtered (stream, "Type @");
 993       gdb_print_host_address (exp->elts[elt].type, stream);
 994       fprintf_filtered (stream, " (");
 995       type_print (exp->elts[elt].type, NULL, stream, 0);
 996       fprintf_filtered (stream, "), value %g",
 997                         (double) exp->elts[elt + 1].doubleconst);
 998       elt += 3;
 999       break;
1000     case OP_VAR_VALUE:
1001       fprintf_filtered (stream, "Block @");
1002       gdb_print_host_address (exp->elts[elt].block, stream);
1003       fprintf_filtered (stream, ", symbol @");
1004       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
1005       fprintf_filtered (stream, " (%s)",
1006                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
1007       elt += 3;
1008       break;
1009     case OP_LAST:
1010       fprintf_filtered (stream, "History element %ld",
1011                         (long) exp->elts[elt].longconst);
1012       elt += 2;
1013       break;
1014     case OP_REGISTER:
1015       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
1016       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
1017       break;
1018     case OP_INTERNALVAR:
1019       fprintf_filtered (stream, "Internal var @");
1020       gdb_print_host_address (exp->elts[elt].internalvar, stream);
1021       fprintf_filtered (stream, " (%s)",
1022                         internalvar_name (exp->elts[elt].internalvar));
1023       elt += 2;
1024       break;
1025     case OP_FUNCALL:
1026       {
1027         int i, nargs;
1028
1029         nargs = longest_to_int (exp->elts[elt].longconst);
1030
1031         fprintf_filtered (stream, "Number of args: %d", nargs);
1032         elt += 2;
1033
1034         for (i = 1; i <= nargs + 1; i++)
1035           elt = dump_subexp (exp, stream, elt);
1036       }
1037       break;
1038     case OP_ARRAY:
1039       {
1040         int lower, upper;
1041         int i;
1042
1043         lower = longest_to_int (exp->elts[elt].longconst);
1044         upper = longest_to_int (exp->elts[elt + 1].longconst);
1045
1046         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
1047         elt += 3;
1048
1049         for (i = 1; i <= upper - lower + 1; i++)
1050           elt = dump_subexp (exp, stream, elt);
1051       }
1052       break;
1053     case UNOP_MEMVAL:
1054     case UNOP_CAST:
1055     case UNOP_DYNAMIC_CAST:
1056     case UNOP_REINTERPRET_CAST:
1057       fprintf_filtered (stream, "Type @");
1058       gdb_print_host_address (exp->elts[elt].type, stream);
1059       fprintf_filtered (stream, " (");
1060       type_print (exp->elts[elt].type, NULL, stream, 0);
1061       fprintf_filtered (stream, ")");
1062       elt = dump_subexp (exp, stream, elt + 2);
1063       break;
1064     case UNOP_MEMVAL_TLS:
1065       fprintf_filtered (stream, "TLS type @");
1066       gdb_print_host_address (exp->elts[elt + 1].type, stream);
1067       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
1068                         (exp->elts[elt].objfile == NULL ? "(null)"
1069                          : exp->elts[elt].objfile->name));
1070       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
1071       fprintf_filtered (stream, ")");
1072       elt = dump_subexp (exp, stream, elt + 3);
1073       break;
1074     case OP_TYPE:
1075       fprintf_filtered (stream, "Type @");
1076       gdb_print_host_address (exp->elts[elt].type, stream);
1077       fprintf_filtered (stream, " (");
1078       type_print (exp->elts[elt].type, NULL, stream, 0);
1079       fprintf_filtered (stream, ")");
1080       elt += 2;
1081       break;
1082     case STRUCTOP_STRUCT:
1083     case STRUCTOP_PTR:
1084       {
1085         char *elem_name;
1086         int len;
1087
1088         len = longest_to_int (exp->elts[elt].longconst);
1089         elem_name = &exp->elts[elt + 1].string;
1090
1091         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
1092         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
1093       }
1094       break;
1095     case OP_SCOPE:
1096       {
1097         char *elem_name;
1098         int len;
1099
1100         fprintf_filtered (stream, "Type @");
1101         gdb_print_host_address (exp->elts[elt].type, stream);
1102         fprintf_filtered (stream, " (");
1103         type_print (exp->elts[elt].type, NULL, stream, 0);
1104         fprintf_filtered (stream, ") ");
1105
1106         len = longest_to_int (exp->elts[elt + 1].longconst);
1107         elem_name = &exp->elts[elt + 2].string;
1108
1109         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1110         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1111       }
1112       break;
1113     default:
1114     case OP_NULL:
1115     case MULTI_SUBSCRIPT:
1116     case OP_F77_UNDETERMINED_ARGLIST:
1117     case OP_COMPLEX:
1118     case OP_STRING:
1119     case OP_BITSTRING:
1120     case OP_BOOL:
1121     case OP_M2_STRING:
1122     case OP_THIS:
1123     case OP_LABELED:
1124     case OP_NAME:
1125       fprintf_filtered (stream, "Unknown format");
1126     }
1127
1128   return elt;
1129 }
1130
1131 void
1132 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1133 {
1134   int elt;
1135
1136   fprintf_filtered (stream, "Dump of expression @ ");
1137   gdb_print_host_address (exp, stream);
1138   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1139   if (exp->elts[0].opcode != OP_TYPE)
1140     print_expression (exp, stream);
1141   else
1142     fputs_filtered ("Type printing not yet supported....", stream);
1143   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1144                     exp->language_defn->la_name, exp->nelts,
1145                     (long) sizeof (union exp_element));
1146   fputs_filtered ("\n", stream);
1147
1148   for (elt = 0; elt < exp->nelts;)
1149     elt = dump_subexp (exp, stream, elt);
1150   fputs_filtered ("\n", stream);
1151 }