gdb/valarith.c

   1 /* Perform arithmetic and other operations on values, for GDB.
   2
   3    Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   4    1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
   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 2 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, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #include "defs.h"
  25 #include "value.h"
  26 #include "symtab.h"
  27 #include "gdbtypes.h"
  28 #include "expression.h"
  29 #include "target.h"
  30 #include "language.h"
  31 #include "gdb_string.h"
  32 #include "doublest.h"
  33 #include <math.h>
  34 #include "infcall.h"
  35
  36 /* Define whether or not the C operator '/' truncates towards zero for
  37    differently signed operands (truncation direction is undefined in C). */
  38
  39 #ifndef TRUNCATION_TOWARDS_ZERO
  40 #define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2)
  41 #endif
  42
  43 static struct value *value_subscripted_rvalue (struct value *, struct value *, int);
  44
  45 void _initialize_valarith (void);
  46 \f
  47
  48 /* Given a pointer, return the size of its target.
  49    If the pointer type is void *, then return 1.
  50    If the target type is incomplete, then error out.
  51    This isn't a general purpose function, but just a
  52    helper for value_sub & value_add.
  53 */
  54
  55 static LONGEST
  56 find_size_for_pointer_math (struct type *ptr_type)
  57 {
  58   LONGEST sz = -1;
  59   struct type *ptr_target;
  60
  61   ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
  62
  63   sz = TYPE_LENGTH (ptr_target);
  64   if (sz == 0)
  65     {
  66       if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
  67         sz = 1;
  68       else
  69         {
  70           char *name;
  71
  72           name = TYPE_NAME (ptr_target);
  73           if (name == NULL)
  74             name = TYPE_TAG_NAME (ptr_target);
  75           if (name == NULL)
  76             error (_("Cannot perform pointer math on incomplete types, "
  77                    "try casting to a known type, or void *."));
  78           else
  79             error (_("Cannot perform pointer math on incomplete type \"%s\", "
  80                    "try casting to a known type, or void *."), name);
  81         }
  82     }
  83   return sz;
  84 }
  85
  86 struct value *
  87 value_add (struct value *arg1, struct value *arg2)
  88 {
  89   struct value *valint;
  90   struct value *valptr;
  91   LONGEST sz;
  92   struct type *type1, *type2, *valptrtype;
  93
  94   arg1 = coerce_array (arg1);
  95   arg2 = coerce_array (arg2);
  96   type1 = check_typedef (value_type (arg1));
  97   type2 = check_typedef (value_type (arg2));
  98
  99   if ((TYPE_CODE (type1) == TYPE_CODE_PTR
 100        || TYPE_CODE (type2) == TYPE_CODE_PTR)
 101       &&
 102       (is_integral_type (type1) || is_integral_type (type2)))
 103     /* Exactly one argument is a pointer, and one is an integer.  */
 104     {
 105       struct value *retval;
 106
 107       if (TYPE_CODE (type1) == TYPE_CODE_PTR)
 108         {
 109           valptr = arg1;
 110           valint = arg2;
 111           valptrtype = type1;
 112         }
 113       else
 114         {
 115           valptr = arg2;
 116           valint = arg1;
 117           valptrtype = type2;
 118         }
 119
 120       sz = find_size_for_pointer_math (valptrtype);
 121
 122       retval = value_from_pointer (valptrtype,
 123                                    value_as_address (valptr)
 124                                    + (sz * value_as_long (valint)));
 125       return retval;
 126     }
 127
 128   return value_binop (arg1, arg2, BINOP_ADD);
 129 }
 130
 131 struct value *
 132 value_sub (struct value *arg1, struct value *arg2)
 133 {
 134   struct type *type1, *type2;
 135   arg1 = coerce_array (arg1);
 136   arg2 = coerce_array (arg2);
 137   type1 = check_typedef (value_type (arg1));
 138   type2 = check_typedef (value_type (arg2));
 139
 140   if (TYPE_CODE (type1) == TYPE_CODE_PTR)
 141     {
 142       if (is_integral_type (type2))
 143         {
 144           /* pointer - integer.  */
 145           LONGEST sz = find_size_for_pointer_math (type1);
 146
 147           return value_from_pointer (type1,
 148                                      (value_as_address (arg1)
 149                                       - (sz * value_as_long (arg2))));
 150         }
 151       else if (TYPE_CODE (type2) == TYPE_CODE_PTR
 152                && TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)))
 153                == TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type2))))
 154         {
 155           /* pointer to <type x> - pointer to <type x>.  */
 156           LONGEST sz = TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)));
 157           return value_from_longest
 158             (builtin_type_long, /* FIXME -- should be ptrdiff_t */
 159              (value_as_long (arg1) - value_as_long (arg2)) / sz);
 160         }
 161       else
 162         {
 163           error (_("\
 164 First argument of `-' is a pointer and second argument is neither\n\
 165 an integer nor a pointer of the same type."));
 166         }
 167     }
 168
 169   return value_binop (arg1, arg2, BINOP_SUB);
 170 }
 171
 172 /* Return the value of ARRAY[IDX].
 173    See comments in value_coerce_array() for rationale for reason for
 174    doing lower bounds adjustment here rather than there.
 175    FIXME:  Perhaps we should validate that the index is valid and if
 176    verbosity is set, warn about invalid indices (but still use them). */
 177
 178 struct value *
 179 value_subscript (struct value *array, struct value *idx)
 180 {
 181   struct value *bound;
 182   int c_style = current_language->c_style_arrays;
 183   struct type *tarray;
 184
 185   array = coerce_ref (array);
 186   tarray = check_typedef (value_type (array));
 187
 188   if (TYPE_CODE (tarray) == TYPE_CODE_ARRAY
 189       || TYPE_CODE (tarray) == TYPE_CODE_STRING)
 190     {
 191       struct type *range_type = TYPE_INDEX_TYPE (tarray);
 192       LONGEST lowerbound, upperbound;
 193       get_discrete_bounds (range_type, &lowerbound, &upperbound);
 194
 195       if (VALUE_LVAL (array) != lval_memory)
 196         return value_subscripted_rvalue (array, idx, lowerbound);
 197
 198       if (c_style == 0)
 199         {
 200           LONGEST index = value_as_long (idx);
 201           if (index >= lowerbound && index <= upperbound)
 202             return value_subscripted_rvalue (array, idx, lowerbound);
 203           /* Emit warning unless we have an array of unknown size.
 204              An array of unknown size has lowerbound 0 and upperbound -1.  */
 205           if (upperbound > -1)
 206             warning (_("array or string index out of range"));
 207           /* fall doing C stuff */
 208           c_style = 1;
 209         }
 210
 211       if (lowerbound != 0)
 212         {
 213           bound = value_from_longest (builtin_type_int, (LONGEST) lowerbound);
 214           idx = value_sub (idx, bound);
 215         }
 216
 217       array = value_coerce_array (array);
 218     }
 219
 220   if (TYPE_CODE (tarray) == TYPE_CODE_BITSTRING)
 221     {
 222       struct type *range_type = TYPE_INDEX_TYPE (tarray);
 223       LONGEST index = value_as_long (idx);
 224       struct value *v;
 225       int offset, byte, bit_index;
 226       LONGEST lowerbound, upperbound;
 227       get_discrete_bounds (range_type, &lowerbound, &upperbound);
 228       if (index < lowerbound || index > upperbound)
 229         error (_("bitstring index out of range"));
 230       index -= lowerbound;
 231       offset = index / TARGET_CHAR_BIT;
 232       byte = *((char *) value_contents (array) + offset);
 233       bit_index = index % TARGET_CHAR_BIT;
 234       byte >>= (BITS_BIG_ENDIAN ? TARGET_CHAR_BIT - 1 - bit_index : bit_index);
 235       v = value_from_longest (LA_BOOL_TYPE, byte & 1);
 236       set_value_bitpos (v, bit_index);
 237       set_value_bitsize (v, 1);
 238       VALUE_LVAL (v) = VALUE_LVAL (array);
 239       if (VALUE_LVAL (array) == lval_internalvar)
 240         VALUE_LVAL (v) = lval_internalvar_component;
 241       VALUE_ADDRESS (v) = VALUE_ADDRESS (array);
 242       VALUE_FRAME_ID (v) = VALUE_FRAME_ID (array);
 243       set_value_offset (v, offset + value_offset (array));
 244       return v;
 245     }
 246
 247   if (c_style)
 248     return value_ind (value_add (array, idx));
 249   else
 250     error (_("not an array or string"));
 251 }
 252
 253 /* Return the value of EXPR[IDX], expr an aggregate rvalue
 254    (eg, a vector register).  This routine used to promote floats
 255    to doubles, but no longer does.  */
 256
 257 static struct value *
 258 value_subscripted_rvalue (struct value *array, struct value *idx, int lowerbound)
 259 {
 260   struct type *array_type = check_typedef (value_type (array));
 261   struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
 262   unsigned int elt_size = TYPE_LENGTH (elt_type);
 263   LONGEST index = value_as_long (idx);
 264   unsigned int elt_offs = elt_size * longest_to_int (index - lowerbound);
 265   struct value *v;
 266
 267   if (index < lowerbound || elt_offs >= TYPE_LENGTH (array_type))
 268     error (_("no such vector element"));
 269
 270   v = allocate_value (elt_type);
 271   if (value_lazy (array))
 272     set_value_lazy (v, 1);
 273   else
 274     memcpy (value_contents_writeable (v),
 275             value_contents (array) + elt_offs, elt_size);
 276
 277   if (VALUE_LVAL (array) == lval_internalvar)
 278     VALUE_LVAL (v) = lval_internalvar_component;
 279   else
 280     VALUE_LVAL (v) = VALUE_LVAL (array);
 281   VALUE_ADDRESS (v) = VALUE_ADDRESS (array);
 282   VALUE_REGNUM (v) = VALUE_REGNUM (array);
 283   VALUE_FRAME_ID (v) = VALUE_FRAME_ID (array);
 284   set_value_offset (v, value_offset (array) + elt_offs);
 285   return v;
 286 }
 287 \f
 288 /* Check to see if either argument is a structure.  This is called so
 289    we know whether to go ahead with the normal binop or look for a
 290    user defined function instead.
 291
 292    For now, we do not overload the `=' operator.  */
 293
 294 int
 295 binop_user_defined_p (enum exp_opcode op, struct value *arg1, struct value *arg2)
 296 {
 297   struct type *type1, *type2;
 298   if (op == BINOP_ASSIGN || op == BINOP_CONCAT)
 299     return 0;
 300   type1 = check_typedef (value_type (arg1));
 301   type2 = check_typedef (value_type (arg2));
 302   return (TYPE_CODE (type1) == TYPE_CODE_STRUCT
 303           || TYPE_CODE (type2) == TYPE_CODE_STRUCT
 304           || (TYPE_CODE (type1) == TYPE_CODE_REF
 305               && TYPE_CODE (TYPE_TARGET_TYPE (type1)) == TYPE_CODE_STRUCT)
 306           || (TYPE_CODE (type2) == TYPE_CODE_REF
 307               && TYPE_CODE (TYPE_TARGET_TYPE (type2)) == TYPE_CODE_STRUCT));
 308 }
 309
 310 /* Check to see if argument is a structure.  This is called so
 311    we know whether to go ahead with the normal unop or look for a
 312    user defined function instead.
 313
 314    For now, we do not overload the `&' operator.  */
 315
 316 int
 317 unop_user_defined_p (enum exp_opcode op, struct value *arg1)
 318 {
 319   struct type *type1;
 320   if (op == UNOP_ADDR)
 321     return 0;
 322   type1 = check_typedef (value_type (arg1));
 323   for (;;)
 324     {
 325       if (TYPE_CODE (type1) == TYPE_CODE_STRUCT)
 326         return 1;
 327       else if (TYPE_CODE (type1) == TYPE_CODE_REF)
 328         type1 = TYPE_TARGET_TYPE (type1);
 329       else
 330         return 0;
 331     }
 332 }
 333
 334 /* We know either arg1 or arg2 is a structure, so try to find the right
 335    user defined function.  Create an argument vector that calls
 336    arg1.operator @ (arg1,arg2) and return that value (where '@' is any
 337    binary operator which is legal for GNU C++).
 338
 339    OP is the operatore, and if it is BINOP_ASSIGN_MODIFY, then OTHEROP
 340    is the opcode saying how to modify it.  Otherwise, OTHEROP is
 341    unused.  */
 342
 343 struct value *
 344 value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
 345                enum exp_opcode otherop, enum noside noside)
 346 {
 347   struct value **argvec;
 348   char *ptr;
 349   char tstr[13];
 350   int static_memfuncp;
 351
 352   arg1 = coerce_ref (arg1);
 353   arg2 = coerce_ref (arg2);
 354   arg1 = coerce_enum (arg1);
 355   arg2 = coerce_enum (arg2);
 356
 357   /* now we know that what we have to do is construct our
 358      arg vector and find the right function to call it with.  */
 359
 360   if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
 361     error (_("Can't do that binary op on that type"));  /* FIXME be explicit */
 362
 363   argvec = (struct value **) alloca (sizeof (struct value *) * 4);
 364   argvec[1] = value_addr (arg1);
 365   argvec[2] = arg2;
 366   argvec[3] = 0;
 367
 368   /* make the right function name up */
 369   strcpy (tstr, "operator__");
 370   ptr = tstr + 8;
 371   switch (op)
 372     {
 373     case BINOP_ADD:
 374       strcpy (ptr, "+");
 375       break;
 376     case BINOP_SUB:
 377       strcpy (ptr, "-");
 378       break;
 379     case BINOP_MUL:
 380       strcpy (ptr, "*");
 381       break;
 382     case BINOP_DIV:
 383       strcpy (ptr, "/");
 384       break;
 385     case BINOP_REM:
 386       strcpy (ptr, "%");
 387       break;
 388     case BINOP_LSH:
 389       strcpy (ptr, "<<");
 390       break;
 391     case BINOP_RSH:
 392       strcpy (ptr, ">>");
 393       break;
 394     case BINOP_BITWISE_AND:
 395       strcpy (ptr, "&");
 396       break;
 397     case BINOP_BITWISE_IOR:
 398       strcpy (ptr, "|");
 399       break;
 400     case BINOP_BITWISE_XOR:
 401       strcpy (ptr, "^");
 402       break;
 403     case BINOP_LOGICAL_AND:
 404       strcpy (ptr, "&&");
 405       break;
 406     case BINOP_LOGICAL_OR:
 407       strcpy (ptr, "||");
 408       break;
 409     case BINOP_MIN:
 410       strcpy (ptr, "<?");
 411       break;
 412     case BINOP_MAX:
 413       strcpy (ptr, ">?");
 414       break;
 415     case BINOP_ASSIGN:
 416       strcpy (ptr, "=");
 417       break;
 418     case BINOP_ASSIGN_MODIFY:
 419       switch (otherop)
 420         {
 421         case BINOP_ADD:
 422           strcpy (ptr, "+=");
 423           break;
 424         case BINOP_SUB:
 425           strcpy (ptr, "-=");
 426           break;
 427         case BINOP_MUL:
 428           strcpy (ptr, "*=");
 429           break;
 430         case BINOP_DIV:
 431           strcpy (ptr, "/=");
 432           break;
 433         case BINOP_REM:
 434           strcpy (ptr, "%=");
 435           break;
 436         case BINOP_BITWISE_AND:
 437           strcpy (ptr, "&=");
 438           break;
 439         case BINOP_BITWISE_IOR:
 440           strcpy (ptr, "|=");
 441           break;
 442         case BINOP_BITWISE_XOR:
 443           strcpy (ptr, "^=");
 444           break;
 445         case BINOP_MOD: /* invalid */
 446         default:
 447           error (_("Invalid binary operation specified."));
 448         }
 449       break;
 450     case BINOP_SUBSCRIPT:
 451       strcpy (ptr, "[]");
 452       break;
 453     case BINOP_EQUAL:
 454       strcpy (ptr, "==");
 455       break;
 456     case BINOP_NOTEQUAL:
 457       strcpy (ptr, "!=");
 458       break;
 459     case BINOP_LESS:
 460       strcpy (ptr, "<");
 461       break;
 462     case BINOP_GTR:
 463       strcpy (ptr, ">");
 464       break;
 465     case BINOP_GEQ:
 466       strcpy (ptr, ">=");
 467       break;
 468     case BINOP_LEQ:
 469       strcpy (ptr, "<=");
 470       break;
 471     case BINOP_MOD:             /* invalid */
 472     default:
 473       error (_("Invalid binary operation specified."));
 474     }
 475
 476   argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
 477
 478   if (argvec[0])
 479     {
 480       if (static_memfuncp)
 481         {
 482           argvec[1] = argvec[0];
 483           argvec++;
 484         }
 485       if (noside == EVAL_AVOID_SIDE_EFFECTS)
 486         {
 487           struct type *return_type;
 488           return_type
 489             = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
 490           return value_zero (return_type, VALUE_LVAL (arg1));
 491         }
 492       return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
 493     }
 494   error (_("member function %s not found"), tstr);
 495 #ifdef lint
 496   return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
 497 #endif
 498 }
 499
 500 /* We know that arg1 is a structure, so try to find a unary user
 501    defined operator that matches the operator in question.
 502    Create an argument vector that calls arg1.operator @ (arg1)
 503    and return that value (where '@' is (almost) any unary operator which
 504    is legal for GNU C++).  */
 505
 506 struct value *
 507 value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
 508 {
 509   struct value **argvec;
 510   char *ptr, *mangle_ptr;
 511   char tstr[13], mangle_tstr[13];
 512   int static_memfuncp, nargs;
 513
 514   arg1 = coerce_ref (arg1);
 515   arg1 = coerce_enum (arg1);
 516
 517   /* now we know that what we have to do is construct our
 518      arg vector and find the right function to call it with.  */
 519
 520   if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
 521     error (_("Can't do that unary op on that type"));   /* FIXME be explicit */
 522
 523   argvec = (struct value **) alloca (sizeof (struct value *) * 4);
 524   argvec[1] = value_addr (arg1);
 525   argvec[2] = 0;
 526
 527   nargs = 1;
 528
 529   /* make the right function name up */
 530   strcpy (tstr, "operator__");
 531   ptr = tstr + 8;
 532   strcpy (mangle_tstr, "__");
 533   mangle_ptr = mangle_tstr + 2;
 534   switch (op)
 535     {
 536     case UNOP_PREINCREMENT:
 537       strcpy (ptr, "++");
 538       break;
 539     case UNOP_PREDECREMENT:
 540       strcpy (ptr, "--");
 541       break;
 542     case UNOP_POSTINCREMENT:
 543       strcpy (ptr, "++");
 544       argvec[2] = value_from_longest (builtin_type_int, 0);
 545       argvec[3] = 0;
 546       nargs ++;
 547       break;
 548     case UNOP_POSTDECREMENT:
 549       strcpy (ptr, "--");
 550       argvec[2] = value_from_longest (builtin_type_int, 0);
 551       argvec[3] = 0;
 552       nargs ++;
 553       break;
 554     case UNOP_LOGICAL_NOT:
 555       strcpy (ptr, "!");
 556       break;
 557     case UNOP_COMPLEMENT:
 558       strcpy (ptr, "~");
 559       break;
 560     case UNOP_NEG:
 561       strcpy (ptr, "-");
 562       break;
 563     case UNOP_PLUS:
 564       strcpy (ptr, "+");
 565       break;
 566     case UNOP_IND:
 567       strcpy (ptr, "*");
 568       break;
 569     default:
 570       error (_("Invalid unary operation specified."));
 571     }
 572
 573   argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
 574
 575   if (argvec[0])
 576     {
 577       if (static_memfuncp)
 578         {
 579           argvec[1] = argvec[0];
 580           nargs --;
 581           argvec++;
 582         }
 583       if (noside == EVAL_AVOID_SIDE_EFFECTS)
 584         {
 585           struct type *return_type;
 586           return_type
 587             = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
 588           return value_zero (return_type, VALUE_LVAL (arg1));
 589         }
 590       return call_function_by_hand (argvec[0], nargs, argvec + 1);
 591     }
 592   error (_("member function %s not found"), tstr);
 593   return 0;                     /* For lint -- never reached */
 594 }
 595 \f
 596
 597 /* Concatenate two values with the following conditions:
 598
 599    (1)  Both values must be either bitstring values or character string
 600    values and the resulting value consists of the concatenation of
 601    ARG1 followed by ARG2.
 602
 603    or
 604
 605    One value must be an integer value and the other value must be
 606    either a bitstring value or character string value, which is
 607    to be repeated by the number of times specified by the integer
 608    value.
 609
 610
 611    (2)  Boolean values are also allowed and are treated as bit string
 612    values of length 1.
 613
 614    (3)  Character values are also allowed and are treated as character
 615    string values of length 1.
 616  */
 617
 618 struct value *
 619 value_concat (struct value *arg1, struct value *arg2)
 620 {
 621   struct value *inval1;
 622   struct value *inval2;
 623   struct value *outval = NULL;
 624   int inval1len, inval2len;
 625   int count, idx;
 626   char *ptr;
 627   char inchar;
 628   struct type *type1 = check_typedef (value_type (arg1));
 629   struct type *type2 = check_typedef (value_type (arg2));
 630
 631   /* First figure out if we are dealing with two values to be concatenated
 632      or a repeat count and a value to be repeated.  INVAL1 is set to the
 633      first of two concatenated values, or the repeat count.  INVAL2 is set
 634      to the second of the two concatenated values or the value to be
 635      repeated. */
 636
 637   if (TYPE_CODE (type2) == TYPE_CODE_INT)
 638     {
 639       struct type *tmp = type1;
 640       type1 = tmp;
 641       tmp = type2;
 642       inval1 = arg2;
 643       inval2 = arg1;
 644     }
 645   else
 646     {
 647       inval1 = arg1;
 648       inval2 = arg2;
 649     }
 650
 651   /* Now process the input values. */
 652
 653   if (TYPE_CODE (type1) == TYPE_CODE_INT)
 654     {
 655       /* We have a repeat count.  Validate the second value and then
 656          construct a value repeated that many times. */
 657       if (TYPE_CODE (type2) == TYPE_CODE_STRING
 658           || TYPE_CODE (type2) == TYPE_CODE_CHAR)
 659         {
 660           count = longest_to_int (value_as_long (inval1));
 661           inval2len = TYPE_LENGTH (type2);
 662           ptr = (char *) alloca (count * inval2len);
 663           if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
 664             {
 665               inchar = (char) unpack_long (type2,
 666                                            value_contents (inval2));
 667               for (idx = 0; idx < count; idx++)
 668                 {
 669                   *(ptr + idx) = inchar;
 670                 }
 671             }
 672           else
 673             {
 674               for (idx = 0; idx < count; idx++)
 675                 {
 676                   memcpy (ptr + (idx * inval2len), value_contents (inval2),
 677                           inval2len);
 678                 }
 679             }
 680           outval = value_string (ptr, count * inval2len);
 681         }
 682       else if (TYPE_CODE (type2) == TYPE_CODE_BITSTRING
 683                || TYPE_CODE (type2) == TYPE_CODE_BOOL)
 684         {
 685           error (_("unimplemented support for bitstring/boolean repeats"));
 686         }
 687       else
 688         {
 689           error (_("can't repeat values of that type"));
 690         }
 691     }
 692   else if (TYPE_CODE (type1) == TYPE_CODE_STRING
 693            || TYPE_CODE (type1) == TYPE_CODE_CHAR)
 694     {
 695       /* We have two character strings to concatenate. */
 696       if (TYPE_CODE (type2) != TYPE_CODE_STRING
 697           && TYPE_CODE (type2) != TYPE_CODE_CHAR)
 698         {
 699           error (_("Strings can only be concatenated with other strings."));
 700         }
 701       inval1len = TYPE_LENGTH (type1);
 702       inval2len = TYPE_LENGTH (type2);
 703       ptr = (char *) alloca (inval1len + inval2len);
 704       if (TYPE_CODE (type1) == TYPE_CODE_CHAR)
 705         {
 706           *ptr = (char) unpack_long (type1, value_contents (inval1));
 707         }
 708       else
 709         {
 710           memcpy (ptr, value_contents (inval1), inval1len);
 711         }
 712       if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
 713         {
 714           *(ptr + inval1len) =
 715             (char) unpack_long (type2, value_contents (inval2));
 716         }
 717       else
 718         {
 719           memcpy (ptr + inval1len, value_contents (inval2), inval2len);
 720         }
 721       outval = value_string (ptr, inval1len + inval2len);
 722     }
 723   else if (TYPE_CODE (type1) == TYPE_CODE_BITSTRING
 724            || TYPE_CODE (type1) == TYPE_CODE_BOOL)
 725     {
 726       /* We have two bitstrings to concatenate. */
 727       if (TYPE_CODE (type2) != TYPE_CODE_BITSTRING
 728           && TYPE_CODE (type2) != TYPE_CODE_BOOL)
 729         {
 730           error (_("Bitstrings or booleans can only be concatenated with other bitstrings or booleans."));
 731         }
 732       error (_("unimplemented support for bitstring/boolean concatenation."));
 733     }
 734   else
 735     {
 736       /* We don't know how to concatenate these operands. */
 737       error (_("illegal operands for concatenation."));
 738     }
 739   return (outval);
 740 }
 741 \f
 742
 743
 744 /* Perform a binary operation on two operands which have reasonable
 745    representations as integers or floats.  This includes booleans,
 746    characters, integers, or floats.
 747    Does not support addition and subtraction on pointers;
 748    use value_add or value_sub if you want to handle those possibilities.  */
 749
 750 struct value *
 751 value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
 752 {
 753   struct value *val;
 754   struct type *type1, *type2;
 755
 756   arg1 = coerce_ref (arg1);
 757   arg2 = coerce_ref (arg2);
 758   type1 = check_typedef (value_type (arg1));
 759   type2 = check_typedef (value_type (arg2));
 760
 761   if ((TYPE_CODE (type1) != TYPE_CODE_FLT && !is_integral_type (type1))
 762       ||
 763       (TYPE_CODE (type2) != TYPE_CODE_FLT && !is_integral_type (type2)))
 764     error (_("Argument to arithmetic operation not a number or boolean."));
 765
 766   if (TYPE_CODE (type1) == TYPE_CODE_FLT
 767       ||
 768       TYPE_CODE (type2) == TYPE_CODE_FLT)
 769     {
 770       /* FIXME-if-picky-about-floating-accuracy: Should be doing this
 771          in target format.  real.c in GCC probably has the necessary
 772          code.  */
 773       DOUBLEST v1, v2, v = 0;
 774       v1 = value_as_double (arg1);
 775       v2 = value_as_double (arg2);
 776       switch (op)
 777         {
 778         case BINOP_ADD:
 779           v = v1 + v2;
 780           break;
 781
 782         case BINOP_SUB:
 783           v = v1 - v2;
 784           break;
 785
 786         case BINOP_MUL:
 787           v = v1 * v2;
 788           break;
 789
 790         case BINOP_DIV:
 791           v = v1 / v2;
 792           break;
 793
 794         case BINOP_EXP:
 795           errno = 0;
 796           v = pow (v1, v2);
 797           if (errno)
 798             error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
 799           break;
 800
 801         default:
 802           error (_("Integer-only operation on floating point number."));
 803         }
 804
 805       /* If either arg was long double, make sure that value is also long
 806          double.  */
 807
 808       if (TYPE_LENGTH (type1) * 8 > TARGET_DOUBLE_BIT
 809           || TYPE_LENGTH (type2) * 8 > TARGET_DOUBLE_BIT)
 810         val = allocate_value (builtin_type_long_double);
 811       else
 812         val = allocate_value (builtin_type_double);
 813
 814       store_typed_floating (value_contents_raw (val), value_type (val), v);
 815     }
 816   else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
 817            &&
 818            TYPE_CODE (type2) == TYPE_CODE_BOOL)
 819     {
 820       LONGEST v1, v2, v = 0;
 821       v1 = value_as_long (arg1);
 822       v2 = value_as_long (arg2);
 823
 824       switch (op)
 825         {
 826         case BINOP_BITWISE_AND:
 827           v = v1 & v2;
 828           break;
 829
 830         case BINOP_BITWISE_IOR:
 831           v = v1 | v2;
 832           break;
 833
 834         case BINOP_BITWISE_XOR:
 835           v = v1 ^ v2;
 836           break;
 837
 838         case BINOP_EQUAL:
 839           v = v1 == v2;
 840           break;
 841
 842         case BINOP_NOTEQUAL:
 843           v = v1 != v2;
 844           break;
 845
 846         default:
 847           error (_("Invalid operation on booleans."));
 848         }
 849
 850       val = allocate_value (type1);
 851       store_signed_integer (value_contents_raw (val),
 852                             TYPE_LENGTH (type1),
 853                             v);
 854     }
 855   else
 856     /* Integral operations here.  */
 857     /* FIXME:  Also mixed integral/booleans, with result an integer. */
 858     /* FIXME: This implements ANSI C rules (also correct for C++).
 859        What about FORTRAN and (the deleted) chill ?  */
 860     {
 861       unsigned int promoted_len1 = TYPE_LENGTH (type1);
 862       unsigned int promoted_len2 = TYPE_LENGTH (type2);
 863       int is_unsigned1 = TYPE_UNSIGNED (type1);
 864       int is_unsigned2 = TYPE_UNSIGNED (type2);
 865       unsigned int result_len;
 866       int unsigned_operation;
 867
 868       /* Determine type length and signedness after promotion for
 869          both operands.  */
 870       if (promoted_len1 < TYPE_LENGTH (builtin_type_int))
 871         {
 872           is_unsigned1 = 0;
 873           promoted_len1 = TYPE_LENGTH (builtin_type_int);
 874         }
 875       if (promoted_len2 < TYPE_LENGTH (builtin_type_int))
 876         {
 877           is_unsigned2 = 0;
 878           promoted_len2 = TYPE_LENGTH (builtin_type_int);
 879         }
 880
 881       /* Determine type length of the result, and if the operation should
 882          be done unsigned.
 883          Use the signedness of the operand with the greater length.
 884          If both operands are of equal length, use unsigned operation
 885          if one of the operands is unsigned.  */
 886       if (op == BINOP_RSH || op == BINOP_LSH)
 887         {
 888           /* In case of the shift operators the type of the result only
 889              depends on the type of the left operand.  */
 890           unsigned_operation = is_unsigned1;
 891           result_len = promoted_len1;
 892         }
 893       else if (promoted_len1 > promoted_len2)
 894         {
 895           unsigned_operation = is_unsigned1;
 896           result_len = promoted_len1;
 897         }
 898       else if (promoted_len2 > promoted_len1)
 899         {
 900           unsigned_operation = is_unsigned2;
 901           result_len = promoted_len2;
 902         }
 903       else
 904         {
 905           unsigned_operation = is_unsigned1 || is_unsigned2;
 906           result_len = promoted_len1;
 907         }
 908
 909       if (unsigned_operation)
 910         {
 911           ULONGEST v1, v2, v = 0;
 912           v1 = (ULONGEST) value_as_long (arg1);
 913           v2 = (ULONGEST) value_as_long (arg2);
 914
 915           /* Truncate values to the type length of the result.  */
 916           if (result_len < sizeof (ULONGEST))
 917             {
 918               v1 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
 919               v2 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
 920             }
 921
 922           switch (op)
 923             {
 924             case BINOP_ADD:
 925               v = v1 + v2;
 926               break;
 927
 928             case BINOP_SUB:
 929               v = v1 - v2;
 930               break;
 931
 932             case BINOP_MUL:
 933               v = v1 * v2;
 934               break;
 935
 936             case BINOP_DIV:
 937               v = v1 / v2;
 938               break;
 939
 940             case BINOP_EXP:
 941               errno = 0;
 942               v = pow (v1, v2);
 943               if (errno)
 944                 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
 945               break;
 946
 947             case BINOP_REM:
 948               v = v1 % v2;
 949               break;
 950
 951             case BINOP_MOD:
 952               /* Knuth 1.2.4, integer only.  Note that unlike the C '%' op,
 953                  v1 mod 0 has a defined value, v1. */
 954               if (v2 == 0)
 955                 {
 956                   v = v1;
 957                 }
 958               else
 959                 {
 960                   v = v1 / v2;
 961                   /* Note floor(v1/v2) == v1/v2 for unsigned. */
 962                   v = v1 - (v2 * v);
 963                 }
 964               break;
 965
 966             case BINOP_LSH:
 967               v = v1 << v2;
 968               break;
 969
 970             case BINOP_RSH:
 971               v = v1 >> v2;
 972               break;
 973
 974             case BINOP_BITWISE_AND:
 975               v = v1 & v2;
 976               break;
 977
 978             case BINOP_BITWISE_IOR:
 979               v = v1 | v2;
 980               break;
 981
 982             case BINOP_BITWISE_XOR:
 983               v = v1 ^ v2;
 984               break;
 985
 986             case BINOP_LOGICAL_AND:
 987               v = v1 && v2;
 988               break;
 989
 990             case BINOP_LOGICAL_OR:
 991               v = v1 || v2;
 992               break;
 993
 994             case BINOP_MIN:
 995               v = v1 < v2 ? v1 : v2;
 996               break;
 997
 998             case BINOP_MAX:
 999               v = v1 > v2 ? v1 : v2;
1000               break;
1001
1002             case BINOP_EQUAL:
1003               v = v1 == v2;
1004               break;
1005
1006             case BINOP_NOTEQUAL:
1007               v = v1 != v2;
1008               break;
1009
1010             case BINOP_LESS:
1011               v = v1 < v2;
1012               break;
1013
1014             default:
1015               error (_("Invalid binary operation on numbers."));
1016             }
1017
1018           /* This is a kludge to get around the fact that we don't
1019              know how to determine the result type from the types of
1020              the operands.  (I'm not really sure how much we feel the
1021              need to duplicate the exact rules of the current
1022              language.  They can get really hairy.  But not to do so
1023              makes it hard to document just what we *do* do).  */
1024
1025           /* Can't just call init_type because we wouldn't know what
1026              name to give the type.  */
1027           val = allocate_value
1028             (result_len > TARGET_LONG_BIT / HOST_CHAR_BIT
1029              ? builtin_type_unsigned_long_long
1030              : builtin_type_unsigned_long);
1031           store_unsigned_integer (value_contents_raw (val),
1032                                   TYPE_LENGTH (value_type (val)),
1033                                   v);
1034         }
1035       else
1036         {
1037           LONGEST v1, v2, v = 0;
1038           v1 = value_as_long (arg1);
1039           v2 = value_as_long (arg2);
1040
1041           switch (op)
1042             {
1043             case BINOP_ADD:
1044               v = v1 + v2;
1045               break;
1046
1047             case BINOP_SUB:
1048               v = v1 - v2;
1049               break;
1050
1051             case BINOP_MUL:
1052               v = v1 * v2;
1053               break;
1054
1055             case BINOP_DIV:
1056               if (v2 != 0)
1057                 v = v1 / v2;
1058               else
1059                 error (_("Division by zero"));
1060               break;
1061
1062             case BINOP_EXP:
1063               errno = 0;
1064               v = pow (v1, v2);
1065               if (errno)
1066                 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
1067               break;
1068
1069             case BINOP_REM:
1070               if (v2 != 0)
1071                 v = v1 % v2;
1072               else
1073                 error (_("Division by zero"));
1074               break;
1075
1076             case BINOP_MOD:
1077               /* Knuth 1.2.4, integer only.  Note that unlike the C '%' op,
1078                  X mod 0 has a defined value, X. */
1079               if (v2 == 0)
1080                 {
1081                   v = v1;
1082                 }
1083               else
1084                 {
1085                   v = v1 / v2;
1086                   /* Compute floor. */
1087                   if (TRUNCATION_TOWARDS_ZERO && (v < 0) && ((v1 % v2) != 0))
1088                     {
1089                       v--;
1090                     }
1091                   v = v1 - (v2 * v);
1092                 }
1093               break;
1094
1095             case BINOP_LSH:
1096               v = v1 << v2;
1097               break;
1098
1099             case BINOP_RSH:
1100               v = v1 >> v2;
1101               break;
1102
1103             case BINOP_BITWISE_AND:
1104               v = v1 & v2;
1105               break;
1106
1107             case BINOP_BITWISE_IOR:
1108               v = v1 | v2;
1109               break;
1110
1111             case BINOP_BITWISE_XOR:
1112               v = v1 ^ v2;
1113               break;
1114
1115             case BINOP_LOGICAL_AND:
1116               v = v1 && v2;
1117               break;
1118
1119             case BINOP_LOGICAL_OR:
1120               v = v1 || v2;
1121               break;
1122
1123             case BINOP_MIN:
1124               v = v1 < v2 ? v1 : v2;
1125               break;
1126
1127             case BINOP_MAX:
1128               v = v1 > v2 ? v1 : v2;
1129               break;
1130
1131             case BINOP_EQUAL:
1132               v = v1 == v2;
1133               break;
1134
1135             case BINOP_LESS:
1136               v = v1 < v2;
1137               break;
1138
1139             default:
1140               error (_("Invalid binary operation on numbers."));
1141             }
1142
1143           /* This is a kludge to get around the fact that we don't
1144              know how to determine the result type from the types of
1145              the operands.  (I'm not really sure how much we feel the
1146              need to duplicate the exact rules of the current
1147              language.  They can get really hairy.  But not to do so
1148              makes it hard to document just what we *do* do).  */
1149
1150           /* Can't just call init_type because we wouldn't know what
1151              name to give the type.  */
1152           val = allocate_value
1153             (result_len > TARGET_LONG_BIT / HOST_CHAR_BIT
1154              ? builtin_type_long_long
1155              : builtin_type_long);
1156           store_signed_integer (value_contents_raw (val),
1157                                 TYPE_LENGTH (value_type (val)),
1158                                 v);
1159         }
1160     }
1161
1162   return val;
1163 }
1164 \f
1165 /* Simulate the C operator ! -- return 1 if ARG1 contains zero.  */
1166
1167 int
1168 value_logical_not (struct value *arg1)
1169 {
1170   int len;
1171   const gdb_byte *p;
1172   struct type *type1;
1173
1174   arg1 = coerce_number (arg1);
1175   type1 = check_typedef (value_type (arg1));
1176
1177   if (TYPE_CODE (type1) == TYPE_CODE_FLT)
1178     return 0 == value_as_double (arg1);
1179
1180   len = TYPE_LENGTH (type1);
1181   p = value_contents (arg1);
1182
1183   while (--len >= 0)
1184     {
1185       if (*p++)
1186         break;
1187     }
1188
1189   return len < 0;
1190 }
1191
1192 /* Perform a comparison on two string values (whose content are not
1193    necessarily null terminated) based on their length */
1194
1195 static int
1196 value_strcmp (struct value *arg1, struct value *arg2)
1197 {
1198   int len1 = TYPE_LENGTH (value_type (arg1));
1199   int len2 = TYPE_LENGTH (value_type (arg2));
1200   const gdb_byte *s1 = value_contents (arg1);
1201   const gdb_byte *s2 = value_contents (arg2);
1202   int i, len = len1 < len2 ? len1 : len2;
1203
1204   for (i = 0; i < len; i++)
1205     {
1206       if (s1[i] < s2[i])
1207         return -1;
1208       else if (s1[i] > s2[i])
1209         return 1;
1210       else
1211         continue;
1212     }
1213
1214   if (len1 < len2)
1215     return -1;
1216   else if (len1 > len2)
1217     return 1;
1218   else
1219     return 0;
1220 }
1221
1222 /* Simulate the C operator == by returning a 1
1223    iff ARG1 and ARG2 have equal contents.  */
1224
1225 int
1226 value_equal (struct value *arg1, struct value *arg2)
1227 {
1228   int len;
1229   const gdb_byte *p1;
1230   const gdb_byte *p2;
1231   struct type *type1, *type2;
1232   enum type_code code1;
1233   enum type_code code2;
1234   int is_int1, is_int2;
1235
1236   arg1 = coerce_array (arg1);
1237   arg2 = coerce_array (arg2);
1238
1239   type1 = check_typedef (value_type (arg1));
1240   type2 = check_typedef (value_type (arg2));
1241   code1 = TYPE_CODE (type1);
1242   code2 = TYPE_CODE (type2);
1243   is_int1 = is_integral_type (type1);
1244   is_int2 = is_integral_type (type2);
1245
1246   if (is_int1 && is_int2)
1247     return longest_to_int (value_as_long (value_binop (arg1, arg2,
1248                                                        BINOP_EQUAL)));
1249   else if ((code1 == TYPE_CODE_FLT || is_int1)
1250            && (code2 == TYPE_CODE_FLT || is_int2))
1251     {
1252       /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1253          `long double' values are returned in static storage (m68k).  */
1254       DOUBLEST d = value_as_double (arg1);
1255       return d == value_as_double (arg2);
1256     }
1257
1258   /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1259      is bigger.  */
1260   else if (code1 == TYPE_CODE_PTR && is_int2)
1261     return value_as_address (arg1) == (CORE_ADDR) value_as_long (arg2);
1262   else if (code2 == TYPE_CODE_PTR && is_int1)
1263     return (CORE_ADDR) value_as_long (arg1) == value_as_address (arg2);
1264
1265   else if (code1 == code2
1266            && ((len = (int) TYPE_LENGTH (type1))
1267                == (int) TYPE_LENGTH (type2)))
1268     {
1269       p1 = value_contents (arg1);
1270       p2 = value_contents (arg2);
1271       while (--len >= 0)
1272         {
1273           if (*p1++ != *p2++)
1274             break;
1275         }
1276       return len < 0;
1277     }
1278   else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1279     {
1280       return value_strcmp (arg1, arg2) == 0;
1281     }
1282   else
1283     {
1284       error (_("Invalid type combination in equality test."));
1285       return 0;                 /* For lint -- never reached */
1286     }
1287 }
1288
1289 /* Simulate the C operator < by returning 1
1290    iff ARG1's contents are less than ARG2's.  */
1291
1292 int
1293 value_less (struct value *arg1, struct value *arg2)
1294 {
1295   enum type_code code1;
1296   enum type_code code2;
1297   struct type *type1, *type2;
1298   int is_int1, is_int2;
1299
1300   arg1 = coerce_array (arg1);
1301   arg2 = coerce_array (arg2);
1302
1303   type1 = check_typedef (value_type (arg1));
1304   type2 = check_typedef (value_type (arg2));
1305   code1 = TYPE_CODE (type1);
1306   code2 = TYPE_CODE (type2);
1307   is_int1 = is_integral_type (type1);
1308   is_int2 = is_integral_type (type2);
1309
1310   if (is_int1 && is_int2)
1311     return longest_to_int (value_as_long (value_binop (arg1, arg2,
1312                                                        BINOP_LESS)));
1313   else if ((code1 == TYPE_CODE_FLT || is_int1)
1314            && (code2 == TYPE_CODE_FLT || is_int2))
1315     {
1316       /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1317          `long double' values are returned in static storage (m68k).  */
1318       DOUBLEST d = value_as_double (arg1);
1319       return d < value_as_double (arg2);
1320     }
1321   else if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
1322     return value_as_address (arg1) < value_as_address (arg2);
1323
1324   /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1325      is bigger.  */
1326   else if (code1 == TYPE_CODE_PTR && is_int2)
1327     return value_as_address (arg1) < (CORE_ADDR) value_as_long (arg2);
1328   else if (code2 == TYPE_CODE_PTR && is_int1)
1329     return (CORE_ADDR) value_as_long (arg1) < value_as_address (arg2);
1330   else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1331     return value_strcmp (arg1, arg2) < 0;
1332   else
1333     {
1334       error (_("Invalid type combination in ordering comparison."));
1335       return 0;
1336     }
1337 }
1338 \f
1339 /* The unary operators +, - and ~.  They free the argument ARG1.  */
1340
1341 struct value *
1342 value_pos (struct value *arg1)
1343 {
1344   struct type *type;
1345
1346   arg1 = coerce_ref (arg1);
1347
1348   type = check_typedef (value_type (arg1));
1349
1350   if (TYPE_CODE (type) == TYPE_CODE_FLT)
1351     return value_from_double (type, value_as_double (arg1));
1352   else if (is_integral_type (type))
1353     {
1354       /* Perform integral promotion for ANSI C/C++.  FIXME: What about
1355          FORTRAN and (the deleted) chill ?  */
1356       if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1357         type = builtin_type_int;
1358
1359       return value_from_longest (type, value_as_long (arg1));
1360     }
1361   else
1362     {
1363       error ("Argument to positive operation not a number.");
1364       return 0;                 /* For lint -- never reached */
1365     }
1366 }
1367
1368 struct value *
1369 value_neg (struct value *arg1)
1370 {
1371   struct type *type;
1372   struct type *result_type = value_type (arg1);
1373
1374   arg1 = coerce_ref (arg1);
1375
1376   type = check_typedef (value_type (arg1));
1377
1378   if (TYPE_CODE (type) == TYPE_CODE_FLT)
1379     return value_from_double (result_type, -value_as_double (arg1));
1380   else if (is_integral_type (type))
1381     {
1382       /* Perform integral promotion for ANSI C/C++.  FIXME: What about
1383          FORTRAN and (the deleted) chill ?  */
1384       if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1385         result_type = builtin_type_int;
1386
1387       return value_from_longest (result_type, -value_as_long (arg1));
1388     }
1389   else
1390     {
1391       error (_("Argument to negate operation not a number."));
1392       return 0;                 /* For lint -- never reached */
1393     }
1394 }
1395
1396 struct value *
1397 value_complement (struct value *arg1)
1398 {
1399   struct type *type;
1400   struct type *result_type = value_type (arg1);
1401
1402   arg1 = coerce_ref (arg1);
1403
1404   type = check_typedef (value_type (arg1));
1405
1406   if (!is_integral_type (type))
1407     error (_("Argument to complement operation not an integer or boolean."));
1408
1409   /* Perform integral promotion for ANSI C/C++.
1410      FIXME: What about FORTRAN ?  */
1411   if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1412     result_type = builtin_type_int;
1413
1414   return value_from_longest (result_type, ~value_as_long (arg1));
1415 }
1416 \f
1417 /* The INDEX'th bit of SET value whose value_type is TYPE,
1418    and whose value_contents is valaddr.
1419    Return -1 if out of range, -2 other error. */
1420
1421 int
1422 value_bit_index (struct type *type, const gdb_byte *valaddr, int index)
1423 {
1424   LONGEST low_bound, high_bound;
1425   LONGEST word;
1426   unsigned rel_index;
1427   struct type *range = TYPE_FIELD_TYPE (type, 0);
1428   if (get_discrete_bounds (range, &low_bound, &high_bound) < 0)
1429     return -2;
1430   if (index < low_bound || index > high_bound)
1431     return -1;
1432   rel_index = index - low_bound;
1433   word = unpack_long (builtin_type_unsigned_char,
1434                       valaddr + (rel_index / TARGET_CHAR_BIT));
1435   rel_index %= TARGET_CHAR_BIT;
1436   if (BITS_BIG_ENDIAN)
1437     rel_index = TARGET_CHAR_BIT - 1 - rel_index;
1438   return (word >> rel_index) & 1;
1439 }
1440
1441 struct value *
1442 value_in (struct value *element, struct value *set)
1443 {
1444   int member;
1445   struct type *settype = check_typedef (value_type (set));
1446   struct type *eltype = check_typedef (value_type (element));
1447   if (TYPE_CODE (eltype) == TYPE_CODE_RANGE)
1448     eltype = TYPE_TARGET_TYPE (eltype);
1449   if (TYPE_CODE (settype) != TYPE_CODE_SET)
1450     error (_("Second argument of 'IN' has wrong type"));
1451   if (TYPE_CODE (eltype) != TYPE_CODE_INT
1452       && TYPE_CODE (eltype) != TYPE_CODE_CHAR
1453       && TYPE_CODE (eltype) != TYPE_CODE_ENUM
1454       && TYPE_CODE (eltype) != TYPE_CODE_BOOL)
1455     error (_("First argument of 'IN' has wrong type"));
1456   member = value_bit_index (settype, value_contents (set),
1457                             value_as_long (element));
1458   if (member < 0)
1459     error (_("First argument of 'IN' not in range"));
1460   return value_from_longest (LA_BOOL_TYPE, member);
1461 }
1462
1463 void
1464 _initialize_valarith (void)
1465 {
1466 }