1 /* Perform arithmetic and other operations on values, for GDB.
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.
7 This file is part of GDB.
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.
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.
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. */
28 #include "expression.h"
31 #include "gdb_string.h"
36 /* Define whether or not the C operator '/' truncates towards zero for
37 differently signed operands (truncation direction is undefined in C). */
39 #ifndef TRUNCATION_TOWARDS_ZERO
40 #define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2)
43 static struct value *value_subscripted_rvalue (struct value *, struct value *, int);
45 void _initialize_valarith (void);
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.
56 find_size_for_pointer_math (struct type *ptr_type)
59 struct type *ptr_target;
61 ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
63 sz = TYPE_LENGTH (ptr_target);
66 if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
72 name = TYPE_NAME (ptr_target);
74 name = TYPE_TAG_NAME (ptr_target);
76 error (_("Cannot perform pointer math on incomplete types, "
77 "try casting to a known type, or void *."));
79 error (_("Cannot perform pointer math on incomplete type \"%s\", "
80 "try casting to a known type, or void *."), name);
87 value_add (struct value *arg1, struct value *arg2)
92 struct type *type1, *type2, *valptrtype;
94 arg1 = coerce_array (arg1);
95 arg2 = coerce_array (arg2);
96 type1 = check_typedef (value_type (arg1));
97 type2 = check_typedef (value_type (arg2));
99 if ((TYPE_CODE (type1) == TYPE_CODE_PTR
100 || TYPE_CODE (type2) == TYPE_CODE_PTR)
102 (is_integral_type (type1) || is_integral_type (type2)))
103 /* Exactly one argument is a pointer, and one is an integer. */
105 struct value *retval;
107 if (TYPE_CODE (type1) == TYPE_CODE_PTR)
120 sz = find_size_for_pointer_math (valptrtype);
122 retval = value_from_pointer (valptrtype,
123 value_as_address (valptr)
124 + (sz * value_as_long (valint)));
128 return value_binop (arg1, arg2, BINOP_ADD);
132 value_sub (struct value *arg1, struct value *arg2)
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));
140 if (TYPE_CODE (type1) == TYPE_CODE_PTR)
142 if (is_integral_type (type2))
144 /* pointer - integer. */
145 LONGEST sz = find_size_for_pointer_math (type1);
147 return value_from_pointer (type1,
148 (value_as_address (arg1)
149 - (sz * value_as_long (arg2))));
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))))
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);
164 First argument of `-' is a pointer and second argument is neither\n\
165 an integer nor a pointer of the same type."));
169 return value_binop (arg1, arg2, BINOP_SUB);
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). */
179 value_subscript (struct value *array, struct value *idx)
182 int c_style = current_language->c_style_arrays;
185 array = coerce_ref (array);
186 tarray = check_typedef (value_type (array));
188 if (TYPE_CODE (tarray) == TYPE_CODE_ARRAY
189 || TYPE_CODE (tarray) == TYPE_CODE_STRING)
191 struct type *range_type = TYPE_INDEX_TYPE (tarray);
192 LONGEST lowerbound, upperbound;
193 get_discrete_bounds (range_type, &lowerbound, &upperbound);
195 if (VALUE_LVAL (array) != lval_memory)
196 return value_subscripted_rvalue (array, idx, lowerbound);
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. */
206 warning (_("array or string index out of range"));
207 /* fall doing C stuff */
213 bound = value_from_longest (builtin_type_int, (LONGEST) lowerbound);
214 idx = value_sub (idx, bound);
217 array = value_coerce_array (array);
220 if (TYPE_CODE (tarray) == TYPE_CODE_BITSTRING)
222 struct type *range_type = TYPE_INDEX_TYPE (tarray);
223 LONGEST index = value_as_long (idx);
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"));
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));
248 return value_ind (value_add (array, idx));
250 error (_("not an array or string"));
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. */
257 static struct value *
258 value_subscripted_rvalue (struct value *array, struct value *idx, int lowerbound)
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);
267 if (index < lowerbound || elt_offs >= TYPE_LENGTH (array_type))
268 error (_("no such vector element"));
270 v = allocate_value (elt_type);
271 if (value_lazy (array))
272 set_value_lazy (v, 1);
274 memcpy (value_contents_writeable (v),
275 value_contents (array) + elt_offs, elt_size);
277 if (VALUE_LVAL (array) == lval_internalvar)
278 VALUE_LVAL (v) = lval_internalvar_component;
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);
288 /* Check to see if either argument is a structure, or a reference to
289 one. This is called so we know whether to go ahead with the normal
290 binop or look for a user defined function instead.
292 For now, we do not overload the `=' operator. */
295 binop_user_defined_p (enum exp_opcode op, struct value *arg1, struct value *arg2)
297 struct type *type1, *type2;
298 if (op == BINOP_ASSIGN || op == BINOP_CONCAT)
301 type1 = check_typedef (value_type (arg1));
302 if (TYPE_CODE (type1) == TYPE_CODE_REF)
303 type1 = check_typedef (TYPE_TARGET_TYPE (type1));
305 type2 = check_typedef (value_type (arg2));
306 if (TYPE_CODE (type2) == TYPE_CODE_REF)
307 type2 = check_typedef (TYPE_TARGET_TYPE (type2));
309 return (TYPE_CODE (type1) == TYPE_CODE_STRUCT
310 || TYPE_CODE (type2) == TYPE_CODE_STRUCT);
313 /* Check to see if argument is a structure. This is called so
314 we know whether to go ahead with the normal unop or look for a
315 user defined function instead.
317 For now, we do not overload the `&' operator. */
320 unop_user_defined_p (enum exp_opcode op, struct value *arg1)
325 type1 = check_typedef (value_type (arg1));
328 if (TYPE_CODE (type1) == TYPE_CODE_STRUCT)
330 else if (TYPE_CODE (type1) == TYPE_CODE_REF)
331 type1 = TYPE_TARGET_TYPE (type1);
337 /* We know either arg1 or arg2 is a structure, so try to find the right
338 user defined function. Create an argument vector that calls
339 arg1.operator @ (arg1,arg2) and return that value (where '@' is any
340 binary operator which is legal for GNU C++).
342 OP is the operatore, and if it is BINOP_ASSIGN_MODIFY, then OTHEROP
343 is the opcode saying how to modify it. Otherwise, OTHEROP is
347 value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
348 enum exp_opcode otherop, enum noside noside)
350 struct value **argvec;
355 arg1 = coerce_ref (arg1);
356 arg2 = coerce_ref (arg2);
357 arg1 = coerce_enum (arg1);
358 arg2 = coerce_enum (arg2);
360 /* now we know that what we have to do is construct our
361 arg vector and find the right function to call it with. */
363 if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
364 error (_("Can't do that binary op on that type")); /* FIXME be explicit */
366 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
367 argvec[1] = value_addr (arg1);
371 /* make the right function name up */
372 strcpy (tstr, "operator__");
397 case BINOP_BITWISE_AND:
400 case BINOP_BITWISE_IOR:
403 case BINOP_BITWISE_XOR:
406 case BINOP_LOGICAL_AND:
409 case BINOP_LOGICAL_OR:
421 case BINOP_ASSIGN_MODIFY:
439 case BINOP_BITWISE_AND:
442 case BINOP_BITWISE_IOR:
445 case BINOP_BITWISE_XOR:
448 case BINOP_MOD: /* invalid */
450 error (_("Invalid binary operation specified."));
453 case BINOP_SUBSCRIPT:
474 case BINOP_MOD: /* invalid */
476 error (_("Invalid binary operation specified."));
479 argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
485 argvec[1] = argvec[0];
488 if (noside == EVAL_AVOID_SIDE_EFFECTS)
490 struct type *return_type;
492 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
493 return value_zero (return_type, VALUE_LVAL (arg1));
495 return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
497 error (_("member function %s not found"), tstr);
499 return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
503 /* We know that arg1 is a structure, so try to find a unary user
504 defined operator that matches the operator in question.
505 Create an argument vector that calls arg1.operator @ (arg1)
506 and return that value (where '@' is (almost) any unary operator which
507 is legal for GNU C++). */
510 value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
512 struct value **argvec;
513 char *ptr, *mangle_ptr;
514 char tstr[13], mangle_tstr[13];
515 int static_memfuncp, nargs;
517 arg1 = coerce_ref (arg1);
518 arg1 = coerce_enum (arg1);
520 /* now we know that what we have to do is construct our
521 arg vector and find the right function to call it with. */
523 if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
524 error (_("Can't do that unary op on that type")); /* FIXME be explicit */
526 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
527 argvec[1] = value_addr (arg1);
532 /* make the right function name up */
533 strcpy (tstr, "operator__");
535 strcpy (mangle_tstr, "__");
536 mangle_ptr = mangle_tstr + 2;
539 case UNOP_PREINCREMENT:
542 case UNOP_PREDECREMENT:
545 case UNOP_POSTINCREMENT:
547 argvec[2] = value_from_longest (builtin_type_int, 0);
551 case UNOP_POSTDECREMENT:
553 argvec[2] = value_from_longest (builtin_type_int, 0);
557 case UNOP_LOGICAL_NOT:
560 case UNOP_COMPLEMENT:
573 error (_("Invalid unary operation specified."));
576 argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
582 argvec[1] = argvec[0];
586 if (noside == EVAL_AVOID_SIDE_EFFECTS)
588 struct type *return_type;
590 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
591 return value_zero (return_type, VALUE_LVAL (arg1));
593 return call_function_by_hand (argvec[0], nargs, argvec + 1);
595 error (_("member function %s not found"), tstr);
596 return 0; /* For lint -- never reached */
600 /* Concatenate two values with the following conditions:
602 (1) Both values must be either bitstring values or character string
603 values and the resulting value consists of the concatenation of
604 ARG1 followed by ARG2.
608 One value must be an integer value and the other value must be
609 either a bitstring value or character string value, which is
610 to be repeated by the number of times specified by the integer
614 (2) Boolean values are also allowed and are treated as bit string
617 (3) Character values are also allowed and are treated as character
618 string values of length 1.
622 value_concat (struct value *arg1, struct value *arg2)
624 struct value *inval1;
625 struct value *inval2;
626 struct value *outval = NULL;
627 int inval1len, inval2len;
631 struct type *type1 = check_typedef (value_type (arg1));
632 struct type *type2 = check_typedef (value_type (arg2));
634 /* First figure out if we are dealing with two values to be concatenated
635 or a repeat count and a value to be repeated. INVAL1 is set to the
636 first of two concatenated values, or the repeat count. INVAL2 is set
637 to the second of the two concatenated values or the value to be
640 if (TYPE_CODE (type2) == TYPE_CODE_INT)
642 struct type *tmp = type1;
654 /* Now process the input values. */
656 if (TYPE_CODE (type1) == TYPE_CODE_INT)
658 /* We have a repeat count. Validate the second value and then
659 construct a value repeated that many times. */
660 if (TYPE_CODE (type2) == TYPE_CODE_STRING
661 || TYPE_CODE (type2) == TYPE_CODE_CHAR)
663 count = longest_to_int (value_as_long (inval1));
664 inval2len = TYPE_LENGTH (type2);
665 ptr = (char *) alloca (count * inval2len);
666 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
668 inchar = (char) unpack_long (type2,
669 value_contents (inval2));
670 for (idx = 0; idx < count; idx++)
672 *(ptr + idx) = inchar;
677 for (idx = 0; idx < count; idx++)
679 memcpy (ptr + (idx * inval2len), value_contents (inval2),
683 outval = value_string (ptr, count * inval2len);
685 else if (TYPE_CODE (type2) == TYPE_CODE_BITSTRING
686 || TYPE_CODE (type2) == TYPE_CODE_BOOL)
688 error (_("unimplemented support for bitstring/boolean repeats"));
692 error (_("can't repeat values of that type"));
695 else if (TYPE_CODE (type1) == TYPE_CODE_STRING
696 || TYPE_CODE (type1) == TYPE_CODE_CHAR)
698 /* We have two character strings to concatenate. */
699 if (TYPE_CODE (type2) != TYPE_CODE_STRING
700 && TYPE_CODE (type2) != TYPE_CODE_CHAR)
702 error (_("Strings can only be concatenated with other strings."));
704 inval1len = TYPE_LENGTH (type1);
705 inval2len = TYPE_LENGTH (type2);
706 ptr = (char *) alloca (inval1len + inval2len);
707 if (TYPE_CODE (type1) == TYPE_CODE_CHAR)
709 *ptr = (char) unpack_long (type1, value_contents (inval1));
713 memcpy (ptr, value_contents (inval1), inval1len);
715 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
718 (char) unpack_long (type2, value_contents (inval2));
722 memcpy (ptr + inval1len, value_contents (inval2), inval2len);
724 outval = value_string (ptr, inval1len + inval2len);
726 else if (TYPE_CODE (type1) == TYPE_CODE_BITSTRING
727 || TYPE_CODE (type1) == TYPE_CODE_BOOL)
729 /* We have two bitstrings to concatenate. */
730 if (TYPE_CODE (type2) != TYPE_CODE_BITSTRING
731 && TYPE_CODE (type2) != TYPE_CODE_BOOL)
733 error (_("Bitstrings or booleans can only be concatenated with other bitstrings or booleans."));
735 error (_("unimplemented support for bitstring/boolean concatenation."));
739 /* We don't know how to concatenate these operands. */
740 error (_("illegal operands for concatenation."));
747 /* Perform a binary operation on two operands which have reasonable
748 representations as integers or floats. This includes booleans,
749 characters, integers, or floats.
750 Does not support addition and subtraction on pointers;
751 use value_add or value_sub if you want to handle those possibilities. */
754 value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
757 struct type *type1, *type2;
759 arg1 = coerce_ref (arg1);
760 arg2 = coerce_ref (arg2);
761 type1 = check_typedef (value_type (arg1));
762 type2 = check_typedef (value_type (arg2));
764 if ((TYPE_CODE (type1) != TYPE_CODE_FLT && !is_integral_type (type1))
766 (TYPE_CODE (type2) != TYPE_CODE_FLT && !is_integral_type (type2)))
767 error (_("Argument to arithmetic operation not a number or boolean."));
769 if (TYPE_CODE (type1) == TYPE_CODE_FLT
771 TYPE_CODE (type2) == TYPE_CODE_FLT)
773 /* FIXME-if-picky-about-floating-accuracy: Should be doing this
774 in target format. real.c in GCC probably has the necessary
776 DOUBLEST v1, v2, v = 0;
777 v1 = value_as_double (arg1);
778 v2 = value_as_double (arg2);
801 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
805 error (_("Integer-only operation on floating point number."));
808 /* If either arg was long double, make sure that value is also long
811 if (TYPE_LENGTH (type1) * 8 > TARGET_DOUBLE_BIT
812 || TYPE_LENGTH (type2) * 8 > TARGET_DOUBLE_BIT)
813 val = allocate_value (builtin_type_long_double);
815 val = allocate_value (builtin_type_double);
817 store_typed_floating (value_contents_raw (val), value_type (val), v);
819 else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
821 TYPE_CODE (type2) == TYPE_CODE_BOOL)
823 LONGEST v1, v2, v = 0;
824 v1 = value_as_long (arg1);
825 v2 = value_as_long (arg2);
829 case BINOP_BITWISE_AND:
833 case BINOP_BITWISE_IOR:
837 case BINOP_BITWISE_XOR:
850 error (_("Invalid operation on booleans."));
853 val = allocate_value (type1);
854 store_signed_integer (value_contents_raw (val),
859 /* Integral operations here. */
860 /* FIXME: Also mixed integral/booleans, with result an integer. */
861 /* FIXME: This implements ANSI C rules (also correct for C++).
862 What about FORTRAN and (the deleted) chill ? */
864 unsigned int promoted_len1 = TYPE_LENGTH (type1);
865 unsigned int promoted_len2 = TYPE_LENGTH (type2);
866 int is_unsigned1 = TYPE_UNSIGNED (type1);
867 int is_unsigned2 = TYPE_UNSIGNED (type2);
868 unsigned int result_len;
869 int unsigned_operation;
871 /* Determine type length and signedness after promotion for
873 if (promoted_len1 < TYPE_LENGTH (builtin_type_int))
876 promoted_len1 = TYPE_LENGTH (builtin_type_int);
878 if (promoted_len2 < TYPE_LENGTH (builtin_type_int))
881 promoted_len2 = TYPE_LENGTH (builtin_type_int);
884 /* Determine type length of the result, and if the operation should
886 Use the signedness of the operand with the greater length.
887 If both operands are of equal length, use unsigned operation
888 if one of the operands is unsigned. */
889 if (op == BINOP_RSH || op == BINOP_LSH)
891 /* In case of the shift operators the type of the result only
892 depends on the type of the left operand. */
893 unsigned_operation = is_unsigned1;
894 result_len = promoted_len1;
896 else if (promoted_len1 > promoted_len2)
898 unsigned_operation = is_unsigned1;
899 result_len = promoted_len1;
901 else if (promoted_len2 > promoted_len1)
903 unsigned_operation = is_unsigned2;
904 result_len = promoted_len2;
908 unsigned_operation = is_unsigned1 || is_unsigned2;
909 result_len = promoted_len1;
912 if (unsigned_operation)
914 ULONGEST v1, v2, v = 0;
915 v1 = (ULONGEST) value_as_long (arg1);
916 v2 = (ULONGEST) value_as_long (arg2);
918 /* Truncate values to the type length of the result. */
919 if (result_len < sizeof (ULONGEST))
921 v1 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
922 v2 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
947 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
955 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
956 v1 mod 0 has a defined value, v1. */
964 /* Note floor(v1/v2) == v1/v2 for unsigned. */
977 case BINOP_BITWISE_AND:
981 case BINOP_BITWISE_IOR:
985 case BINOP_BITWISE_XOR:
989 case BINOP_LOGICAL_AND:
993 case BINOP_LOGICAL_OR:
998 v = v1 < v2 ? v1 : v2;
1002 v = v1 > v2 ? v1 : v2;
1009 case BINOP_NOTEQUAL:
1018 error (_("Invalid binary operation on numbers."));
1021 /* This is a kludge to get around the fact that we don't
1022 know how to determine the result type from the types of
1023 the operands. (I'm not really sure how much we feel the
1024 need to duplicate the exact rules of the current
1025 language. They can get really hairy. But not to do so
1026 makes it hard to document just what we *do* do). */
1028 /* Can't just call init_type because we wouldn't know what
1029 name to give the type. */
1030 val = allocate_value
1031 (result_len > TARGET_LONG_BIT / HOST_CHAR_BIT
1032 ? builtin_type_unsigned_long_long
1033 : builtin_type_unsigned_long);
1034 store_unsigned_integer (value_contents_raw (val),
1035 TYPE_LENGTH (value_type (val)),
1040 LONGEST v1, v2, v = 0;
1041 v1 = value_as_long (arg1);
1042 v2 = value_as_long (arg2);
1062 error (_("Division by zero"));
1069 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
1076 error (_("Division by zero"));
1080 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1081 X mod 0 has a defined value, X. */
1089 /* Compute floor. */
1090 if (TRUNCATION_TOWARDS_ZERO && (v < 0) && ((v1 % v2) != 0))
1106 case BINOP_BITWISE_AND:
1110 case BINOP_BITWISE_IOR:
1114 case BINOP_BITWISE_XOR:
1118 case BINOP_LOGICAL_AND:
1122 case BINOP_LOGICAL_OR:
1127 v = v1 < v2 ? v1 : v2;
1131 v = v1 > v2 ? v1 : v2;
1143 error (_("Invalid binary operation on numbers."));
1146 /* This is a kludge to get around the fact that we don't
1147 know how to determine the result type from the types of
1148 the operands. (I'm not really sure how much we feel the
1149 need to duplicate the exact rules of the current
1150 language. They can get really hairy. But not to do so
1151 makes it hard to document just what we *do* do). */
1153 /* Can't just call init_type because we wouldn't know what
1154 name to give the type. */
1155 val = allocate_value
1156 (result_len > TARGET_LONG_BIT / HOST_CHAR_BIT
1157 ? builtin_type_long_long
1158 : builtin_type_long);
1159 store_signed_integer (value_contents_raw (val),
1160 TYPE_LENGTH (value_type (val)),
1168 /* Simulate the C operator ! -- return 1 if ARG1 contains zero. */
1171 value_logical_not (struct value *arg1)
1177 arg1 = coerce_number (arg1);
1178 type1 = check_typedef (value_type (arg1));
1180 if (TYPE_CODE (type1) == TYPE_CODE_FLT)
1181 return 0 == value_as_double (arg1);
1183 len = TYPE_LENGTH (type1);
1184 p = value_contents (arg1);
1195 /* Perform a comparison on two string values (whose content are not
1196 necessarily null terminated) based on their length */
1199 value_strcmp (struct value *arg1, struct value *arg2)
1201 int len1 = TYPE_LENGTH (value_type (arg1));
1202 int len2 = TYPE_LENGTH (value_type (arg2));
1203 const gdb_byte *s1 = value_contents (arg1);
1204 const gdb_byte *s2 = value_contents (arg2);
1205 int i, len = len1 < len2 ? len1 : len2;
1207 for (i = 0; i < len; i++)
1211 else if (s1[i] > s2[i])
1219 else if (len1 > len2)
1225 /* Simulate the C operator == by returning a 1
1226 iff ARG1 and ARG2 have equal contents. */
1229 value_equal (struct value *arg1, struct value *arg2)
1234 struct type *type1, *type2;
1235 enum type_code code1;
1236 enum type_code code2;
1237 int is_int1, is_int2;
1239 arg1 = coerce_array (arg1);
1240 arg2 = coerce_array (arg2);
1242 type1 = check_typedef (value_type (arg1));
1243 type2 = check_typedef (value_type (arg2));
1244 code1 = TYPE_CODE (type1);
1245 code2 = TYPE_CODE (type2);
1246 is_int1 = is_integral_type (type1);
1247 is_int2 = is_integral_type (type2);
1249 if (is_int1 && is_int2)
1250 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1252 else if ((code1 == TYPE_CODE_FLT || is_int1)
1253 && (code2 == TYPE_CODE_FLT || is_int2))
1255 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1256 `long double' values are returned in static storage (m68k). */
1257 DOUBLEST d = value_as_double (arg1);
1258 return d == value_as_double (arg2);
1261 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1263 else if (code1 == TYPE_CODE_PTR && is_int2)
1264 return value_as_address (arg1) == (CORE_ADDR) value_as_long (arg2);
1265 else if (code2 == TYPE_CODE_PTR && is_int1)
1266 return (CORE_ADDR) value_as_long (arg1) == value_as_address (arg2);
1268 else if (code1 == code2
1269 && ((len = (int) TYPE_LENGTH (type1))
1270 == (int) TYPE_LENGTH (type2)))
1272 p1 = value_contents (arg1);
1273 p2 = value_contents (arg2);
1281 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1283 return value_strcmp (arg1, arg2) == 0;
1287 error (_("Invalid type combination in equality test."));
1288 return 0; /* For lint -- never reached */
1292 /* Simulate the C operator < by returning 1
1293 iff ARG1's contents are less than ARG2's. */
1296 value_less (struct value *arg1, struct value *arg2)
1298 enum type_code code1;
1299 enum type_code code2;
1300 struct type *type1, *type2;
1301 int is_int1, is_int2;
1303 arg1 = coerce_array (arg1);
1304 arg2 = coerce_array (arg2);
1306 type1 = check_typedef (value_type (arg1));
1307 type2 = check_typedef (value_type (arg2));
1308 code1 = TYPE_CODE (type1);
1309 code2 = TYPE_CODE (type2);
1310 is_int1 = is_integral_type (type1);
1311 is_int2 = is_integral_type (type2);
1313 if (is_int1 && is_int2)
1314 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1316 else if ((code1 == TYPE_CODE_FLT || is_int1)
1317 && (code2 == TYPE_CODE_FLT || is_int2))
1319 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1320 `long double' values are returned in static storage (m68k). */
1321 DOUBLEST d = value_as_double (arg1);
1322 return d < value_as_double (arg2);
1324 else if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
1325 return value_as_address (arg1) < value_as_address (arg2);
1327 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1329 else if (code1 == TYPE_CODE_PTR && is_int2)
1330 return value_as_address (arg1) < (CORE_ADDR) value_as_long (arg2);
1331 else if (code2 == TYPE_CODE_PTR && is_int1)
1332 return (CORE_ADDR) value_as_long (arg1) < value_as_address (arg2);
1333 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1334 return value_strcmp (arg1, arg2) < 0;
1337 error (_("Invalid type combination in ordering comparison."));
1342 /* The unary operators +, - and ~. They free the argument ARG1. */
1345 value_pos (struct value *arg1)
1349 arg1 = coerce_ref (arg1);
1351 type = check_typedef (value_type (arg1));
1353 if (TYPE_CODE (type) == TYPE_CODE_FLT)
1354 return value_from_double (type, value_as_double (arg1));
1355 else if (is_integral_type (type))
1357 /* Perform integral promotion for ANSI C/C++. FIXME: What about
1358 FORTRAN and (the deleted) chill ? */
1359 if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1360 type = builtin_type_int;
1362 return value_from_longest (type, value_as_long (arg1));
1366 error ("Argument to positive operation not a number.");
1367 return 0; /* For lint -- never reached */
1372 value_neg (struct value *arg1)
1375 struct type *result_type = value_type (arg1);
1377 arg1 = coerce_ref (arg1);
1379 type = check_typedef (value_type (arg1));
1381 if (TYPE_CODE (type) == TYPE_CODE_FLT)
1382 return value_from_double (result_type, -value_as_double (arg1));
1383 else if (is_integral_type (type))
1385 /* Perform integral promotion for ANSI C/C++. FIXME: What about
1386 FORTRAN and (the deleted) chill ? */
1387 if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1388 result_type = builtin_type_int;
1390 return value_from_longest (result_type, -value_as_long (arg1));
1394 error (_("Argument to negate operation not a number."));
1395 return 0; /* For lint -- never reached */
1400 value_complement (struct value *arg1)
1403 struct type *result_type = value_type (arg1);
1405 arg1 = coerce_ref (arg1);
1407 type = check_typedef (value_type (arg1));
1409 if (!is_integral_type (type))
1410 error (_("Argument to complement operation not an integer or boolean."));
1412 /* Perform integral promotion for ANSI C/C++.
1413 FIXME: What about FORTRAN ? */
1414 if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1415 result_type = builtin_type_int;
1417 return value_from_longest (result_type, ~value_as_long (arg1));
1420 /* The INDEX'th bit of SET value whose value_type is TYPE,
1421 and whose value_contents is valaddr.
1422 Return -1 if out of range, -2 other error. */
1425 value_bit_index (struct type *type, const gdb_byte *valaddr, int index)
1427 LONGEST low_bound, high_bound;
1430 struct type *range = TYPE_FIELD_TYPE (type, 0);
1431 if (get_discrete_bounds (range, &low_bound, &high_bound) < 0)
1433 if (index < low_bound || index > high_bound)
1435 rel_index = index - low_bound;
1436 word = unpack_long (builtin_type_unsigned_char,
1437 valaddr + (rel_index / TARGET_CHAR_BIT));
1438 rel_index %= TARGET_CHAR_BIT;
1439 if (BITS_BIG_ENDIAN)
1440 rel_index = TARGET_CHAR_BIT - 1 - rel_index;
1441 return (word >> rel_index) & 1;
1445 value_in (struct value *element, struct value *set)
1448 struct type *settype = check_typedef (value_type (set));
1449 struct type *eltype = check_typedef (value_type (element));
1450 if (TYPE_CODE (eltype) == TYPE_CODE_RANGE)
1451 eltype = TYPE_TARGET_TYPE (eltype);
1452 if (TYPE_CODE (settype) != TYPE_CODE_SET)
1453 error (_("Second argument of 'IN' has wrong type"));
1454 if (TYPE_CODE (eltype) != TYPE_CODE_INT
1455 && TYPE_CODE (eltype) != TYPE_CODE_CHAR
1456 && TYPE_CODE (eltype) != TYPE_CODE_ENUM
1457 && TYPE_CODE (eltype) != TYPE_CODE_BOOL)
1458 error (_("First argument of 'IN' has wrong type"));
1459 member = value_bit_index (settype, value_contents (set),
1460 value_as_long (element));
1462 error (_("First argument of 'IN' not in range"));
1463 return value_from_longest (LA_BOOL_TYPE, member);
1467 _initialize_valarith (void)