1 /* Perform arithmetic and other operations on values, for GDB.
3 Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free
5 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., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, 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. This is called so
289 we know whether to go ahead with the normal binop or look for a
290 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)
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));
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.
314 For now, we do not overload the `&' operator. */
317 unop_user_defined_p (enum exp_opcode op, struct value *arg1)
322 type1 = check_typedef (value_type (arg1));
325 if (TYPE_CODE (type1) == TYPE_CODE_STRUCT)
327 else if (TYPE_CODE (type1) == TYPE_CODE_REF)
328 type1 = TYPE_TARGET_TYPE (type1);
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++).
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
344 value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
345 enum exp_opcode otherop, enum noside noside)
347 struct value **argvec;
352 arg1 = coerce_ref (arg1);
353 arg2 = coerce_ref (arg2);
354 arg1 = coerce_enum (arg1);
355 arg2 = coerce_enum (arg2);
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. */
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 */
363 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
364 argvec[1] = value_addr (arg1);
368 /* make the right function name up */
369 strcpy (tstr, "operator__");
394 case BINOP_BITWISE_AND:
397 case BINOP_BITWISE_IOR:
400 case BINOP_BITWISE_XOR:
403 case BINOP_LOGICAL_AND:
406 case BINOP_LOGICAL_OR:
418 case BINOP_ASSIGN_MODIFY:
436 case BINOP_BITWISE_AND:
439 case BINOP_BITWISE_IOR:
442 case BINOP_BITWISE_XOR:
445 case BINOP_MOD: /* invalid */
447 error ("Invalid binary operation specified.");
450 case BINOP_SUBSCRIPT:
471 case BINOP_MOD: /* invalid */
473 error ("Invalid binary operation specified.");
476 argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
482 argvec[1] = argvec[0];
485 if (noside == EVAL_AVOID_SIDE_EFFECTS)
487 struct type *return_type;
489 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
490 return value_zero (return_type, VALUE_LVAL (arg1));
492 return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
494 error ("member function %s not found", tstr);
496 return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
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++). */
507 value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
509 struct value **argvec;
510 char *ptr, *mangle_ptr;
511 char tstr[13], mangle_tstr[13];
512 int static_memfuncp, nargs;
514 arg1 = coerce_ref (arg1);
515 arg1 = coerce_enum (arg1);
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. */
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 */
523 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
524 argvec[1] = value_addr (arg1);
529 /* make the right function name up */
530 strcpy (tstr, "operator__");
532 strcpy (mangle_tstr, "__");
533 mangle_ptr = mangle_tstr + 2;
536 case UNOP_PREINCREMENT:
539 case UNOP_PREDECREMENT:
542 case UNOP_POSTINCREMENT:
544 argvec[2] = value_from_longest (builtin_type_int, 0);
548 case UNOP_POSTDECREMENT:
550 argvec[2] = value_from_longest (builtin_type_int, 0);
554 case UNOP_LOGICAL_NOT:
557 case UNOP_COMPLEMENT:
567 error ("Invalid unary operation specified.");
570 argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
576 argvec[1] = argvec[0];
580 if (noside == EVAL_AVOID_SIDE_EFFECTS)
582 struct type *return_type;
584 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
585 return value_zero (return_type, VALUE_LVAL (arg1));
587 return call_function_by_hand (argvec[0], nargs, argvec + 1);
589 error ("member function %s not found", tstr);
590 return 0; /* For lint -- never reached */
594 /* Concatenate two values with the following conditions:
596 (1) Both values must be either bitstring values or character string
597 values and the resulting value consists of the concatenation of
598 ARG1 followed by ARG2.
602 One value must be an integer value and the other value must be
603 either a bitstring value or character string value, which is
604 to be repeated by the number of times specified by the integer
608 (2) Boolean values are also allowed and are treated as bit string
611 (3) Character values are also allowed and are treated as character
612 string values of length 1.
616 value_concat (struct value *arg1, struct value *arg2)
618 struct value *inval1;
619 struct value *inval2;
620 struct value *outval = NULL;
621 int inval1len, inval2len;
625 struct type *type1 = check_typedef (value_type (arg1));
626 struct type *type2 = check_typedef (value_type (arg2));
628 /* First figure out if we are dealing with two values to be concatenated
629 or a repeat count and a value to be repeated. INVAL1 is set to the
630 first of two concatenated values, or the repeat count. INVAL2 is set
631 to the second of the two concatenated values or the value to be
634 if (TYPE_CODE (type2) == TYPE_CODE_INT)
636 struct type *tmp = type1;
648 /* Now process the input values. */
650 if (TYPE_CODE (type1) == TYPE_CODE_INT)
652 /* We have a repeat count. Validate the second value and then
653 construct a value repeated that many times. */
654 if (TYPE_CODE (type2) == TYPE_CODE_STRING
655 || TYPE_CODE (type2) == TYPE_CODE_CHAR)
657 count = longest_to_int (value_as_long (inval1));
658 inval2len = TYPE_LENGTH (type2);
659 ptr = (char *) alloca (count * inval2len);
660 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
662 inchar = (char) unpack_long (type2,
663 value_contents (inval2));
664 for (idx = 0; idx < count; idx++)
666 *(ptr + idx) = inchar;
671 for (idx = 0; idx < count; idx++)
673 memcpy (ptr + (idx * inval2len), value_contents (inval2),
677 outval = value_string (ptr, count * inval2len);
679 else if (TYPE_CODE (type2) == TYPE_CODE_BITSTRING
680 || TYPE_CODE (type2) == TYPE_CODE_BOOL)
682 error ("unimplemented support for bitstring/boolean repeats");
686 error ("can't repeat values of that type");
689 else if (TYPE_CODE (type1) == TYPE_CODE_STRING
690 || TYPE_CODE (type1) == TYPE_CODE_CHAR)
692 /* We have two character strings to concatenate. */
693 if (TYPE_CODE (type2) != TYPE_CODE_STRING
694 && TYPE_CODE (type2) != TYPE_CODE_CHAR)
696 error ("Strings can only be concatenated with other strings.");
698 inval1len = TYPE_LENGTH (type1);
699 inval2len = TYPE_LENGTH (type2);
700 ptr = (char *) alloca (inval1len + inval2len);
701 if (TYPE_CODE (type1) == TYPE_CODE_CHAR)
703 *ptr = (char) unpack_long (type1, value_contents (inval1));
707 memcpy (ptr, value_contents (inval1), inval1len);
709 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
712 (char) unpack_long (type2, value_contents (inval2));
716 memcpy (ptr + inval1len, value_contents (inval2), inval2len);
718 outval = value_string (ptr, inval1len + inval2len);
720 else if (TYPE_CODE (type1) == TYPE_CODE_BITSTRING
721 || TYPE_CODE (type1) == TYPE_CODE_BOOL)
723 /* We have two bitstrings to concatenate. */
724 if (TYPE_CODE (type2) != TYPE_CODE_BITSTRING
725 && TYPE_CODE (type2) != TYPE_CODE_BOOL)
727 error ("Bitstrings or booleans can only be concatenated with other bitstrings or booleans.");
729 error ("unimplemented support for bitstring/boolean concatenation.");
733 /* We don't know how to concatenate these operands. */
734 error ("illegal operands for concatenation.");
741 /* Perform a binary operation on two operands which have reasonable
742 representations as integers or floats. This includes booleans,
743 characters, integers, or floats.
744 Does not support addition and subtraction on pointers;
745 use value_add or value_sub if you want to handle those possibilities. */
748 value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
751 struct type *type1, *type2;
753 arg1 = coerce_ref (arg1);
754 arg2 = coerce_ref (arg2);
755 type1 = check_typedef (value_type (arg1));
756 type2 = check_typedef (value_type (arg2));
758 if ((TYPE_CODE (type1) != TYPE_CODE_FLT && !is_integral_type (type1))
760 (TYPE_CODE (type2) != TYPE_CODE_FLT && !is_integral_type (type2)))
761 error ("Argument to arithmetic operation not a number or boolean.");
763 if (TYPE_CODE (type1) == TYPE_CODE_FLT
765 TYPE_CODE (type2) == TYPE_CODE_FLT)
767 /* FIXME-if-picky-about-floating-accuracy: Should be doing this
768 in target format. real.c in GCC probably has the necessary
770 DOUBLEST v1, v2, v = 0;
771 v1 = value_as_double (arg1);
772 v2 = value_as_double (arg2);
794 error ("Cannot perform exponentiation: %s", safe_strerror (errno));
798 error ("Integer-only operation on floating point number.");
801 /* If either arg was long double, make sure that value is also long
804 if (TYPE_LENGTH (type1) * 8 > TARGET_DOUBLE_BIT
805 || TYPE_LENGTH (type2) * 8 > TARGET_DOUBLE_BIT)
806 val = allocate_value (builtin_type_long_double);
808 val = allocate_value (builtin_type_double);
810 store_typed_floating (value_contents_raw (val), value_type (val), v);
812 else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
814 TYPE_CODE (type2) == TYPE_CODE_BOOL)
816 LONGEST v1, v2, v = 0;
817 v1 = value_as_long (arg1);
818 v2 = value_as_long (arg2);
822 case BINOP_BITWISE_AND:
826 case BINOP_BITWISE_IOR:
830 case BINOP_BITWISE_XOR:
843 error ("Invalid operation on booleans.");
846 val = allocate_value (type1);
847 store_signed_integer (value_contents_raw (val),
852 /* Integral operations here. */
853 /* FIXME: Also mixed integral/booleans, with result an integer. */
854 /* FIXME: This implements ANSI C rules (also correct for C++).
855 What about FORTRAN and (the deleted) chill ? */
857 unsigned int promoted_len1 = TYPE_LENGTH (type1);
858 unsigned int promoted_len2 = TYPE_LENGTH (type2);
859 int is_unsigned1 = TYPE_UNSIGNED (type1);
860 int is_unsigned2 = TYPE_UNSIGNED (type2);
861 unsigned int result_len;
862 int unsigned_operation;
864 /* Determine type length and signedness after promotion for
866 if (promoted_len1 < TYPE_LENGTH (builtin_type_int))
869 promoted_len1 = TYPE_LENGTH (builtin_type_int);
871 if (promoted_len2 < TYPE_LENGTH (builtin_type_int))
874 promoted_len2 = TYPE_LENGTH (builtin_type_int);
877 /* Determine type length of the result, and if the operation should
879 Use the signedness of the operand with the greater length.
880 If both operands are of equal length, use unsigned operation
881 if one of the operands is unsigned. */
882 if (promoted_len1 > promoted_len2)
884 unsigned_operation = is_unsigned1;
885 result_len = promoted_len1;
887 else if (promoted_len2 > promoted_len1)
889 unsigned_operation = is_unsigned2;
890 result_len = promoted_len2;
894 unsigned_operation = is_unsigned1 || is_unsigned2;
895 result_len = promoted_len1;
898 if (unsigned_operation)
900 ULONGEST v1, v2, v = 0;
901 v1 = (ULONGEST) value_as_long (arg1);
902 v2 = (ULONGEST) value_as_long (arg2);
904 /* Truncate values to the type length of the result. */
905 if (result_len < sizeof (ULONGEST))
907 v1 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
908 v2 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
932 error ("Cannot perform exponentiation: %s", safe_strerror (errno));
940 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
941 v1 mod 0 has a defined value, v1. */
949 /* Note floor(v1/v2) == v1/v2 for unsigned. */
962 case BINOP_BITWISE_AND:
966 case BINOP_BITWISE_IOR:
970 case BINOP_BITWISE_XOR:
974 case BINOP_LOGICAL_AND:
978 case BINOP_LOGICAL_OR:
983 v = v1 < v2 ? v1 : v2;
987 v = v1 > v2 ? v1 : v2;
1003 error ("Invalid binary operation on numbers.");
1006 /* This is a kludge to get around the fact that we don't
1007 know how to determine the result type from the types of
1008 the operands. (I'm not really sure how much we feel the
1009 need to duplicate the exact rules of the current
1010 language. They can get really hairy. But not to do so
1011 makes it hard to document just what we *do* do). */
1013 /* Can't just call init_type because we wouldn't know what
1014 name to give the type. */
1015 val = allocate_value
1016 (result_len > TARGET_LONG_BIT / HOST_CHAR_BIT
1017 ? builtin_type_unsigned_long_long
1018 : builtin_type_unsigned_long);
1019 store_unsigned_integer (value_contents_raw (val),
1020 TYPE_LENGTH (value_type (val)),
1025 LONGEST v1, v2, v = 0;
1026 v1 = value_as_long (arg1);
1027 v2 = value_as_long (arg2);
1047 error ("Division by zero");
1053 error ("Cannot perform exponentiation: %s", safe_strerror (errno));
1060 error ("Division by zero");
1064 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1065 X mod 0 has a defined value, X. */
1073 /* Compute floor. */
1074 if (TRUNCATION_TOWARDS_ZERO && (v < 0) && ((v1 % v2) != 0))
1090 case BINOP_BITWISE_AND:
1094 case BINOP_BITWISE_IOR:
1098 case BINOP_BITWISE_XOR:
1102 case BINOP_LOGICAL_AND:
1106 case BINOP_LOGICAL_OR:
1111 v = v1 < v2 ? v1 : v2;
1115 v = v1 > v2 ? v1 : v2;
1127 error ("Invalid binary operation on numbers.");
1130 /* This is a kludge to get around the fact that we don't
1131 know how to determine the result type from the types of
1132 the operands. (I'm not really sure how much we feel the
1133 need to duplicate the exact rules of the current
1134 language. They can get really hairy. But not to do so
1135 makes it hard to document just what we *do* do). */
1137 /* Can't just call init_type because we wouldn't know what
1138 name to give the type. */
1139 val = allocate_value
1140 (result_len > TARGET_LONG_BIT / HOST_CHAR_BIT
1141 ? builtin_type_long_long
1142 : builtin_type_long);
1143 store_signed_integer (value_contents_raw (val),
1144 TYPE_LENGTH (value_type (val)),
1152 /* Simulate the C operator ! -- return 1 if ARG1 contains zero. */
1155 value_logical_not (struct value *arg1)
1161 arg1 = coerce_number (arg1);
1162 type1 = check_typedef (value_type (arg1));
1164 if (TYPE_CODE (type1) == TYPE_CODE_FLT)
1165 return 0 == value_as_double (arg1);
1167 len = TYPE_LENGTH (type1);
1168 p = value_contents (arg1);
1179 /* Perform a comparison on two string values (whose content are not
1180 necessarily null terminated) based on their length */
1183 value_strcmp (struct value *arg1, struct value *arg2)
1185 int len1 = TYPE_LENGTH (value_type (arg1));
1186 int len2 = TYPE_LENGTH (value_type (arg2));
1187 const bfd_byte *s1 = value_contents (arg1);
1188 const bfd_byte *s2 = value_contents (arg2);
1189 int i, len = len1 < len2 ? len1 : len2;
1191 for (i = 0; i < len; i++)
1195 else if (s1[i] > s2[i])
1203 else if (len1 > len2)
1209 /* Simulate the C operator == by returning a 1
1210 iff ARG1 and ARG2 have equal contents. */
1213 value_equal (struct value *arg1, struct value *arg2)
1218 struct type *type1, *type2;
1219 enum type_code code1;
1220 enum type_code code2;
1221 int is_int1, is_int2;
1223 arg1 = coerce_array (arg1);
1224 arg2 = coerce_array (arg2);
1226 type1 = check_typedef (value_type (arg1));
1227 type2 = check_typedef (value_type (arg2));
1228 code1 = TYPE_CODE (type1);
1229 code2 = TYPE_CODE (type2);
1230 is_int1 = is_integral_type (type1);
1231 is_int2 = is_integral_type (type2);
1233 if (is_int1 && is_int2)
1234 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1236 else if ((code1 == TYPE_CODE_FLT || is_int1)
1237 && (code2 == TYPE_CODE_FLT || is_int2))
1238 return value_as_double (arg1) == value_as_double (arg2);
1240 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1242 else if (code1 == TYPE_CODE_PTR && is_int2)
1243 return value_as_address (arg1) == (CORE_ADDR) value_as_long (arg2);
1244 else if (code2 == TYPE_CODE_PTR && is_int1)
1245 return (CORE_ADDR) value_as_long (arg1) == value_as_address (arg2);
1247 else if (code1 == code2
1248 && ((len = (int) TYPE_LENGTH (type1))
1249 == (int) TYPE_LENGTH (type2)))
1251 p1 = value_contents (arg1);
1252 p2 = value_contents (arg2);
1260 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1262 return value_strcmp (arg1, arg2) == 0;
1266 error ("Invalid type combination in equality test.");
1267 return 0; /* For lint -- never reached */
1271 /* Simulate the C operator < by returning 1
1272 iff ARG1's contents are less than ARG2's. */
1275 value_less (struct value *arg1, struct value *arg2)
1277 enum type_code code1;
1278 enum type_code code2;
1279 struct type *type1, *type2;
1280 int is_int1, is_int2;
1282 arg1 = coerce_array (arg1);
1283 arg2 = coerce_array (arg2);
1285 type1 = check_typedef (value_type (arg1));
1286 type2 = check_typedef (value_type (arg2));
1287 code1 = TYPE_CODE (type1);
1288 code2 = TYPE_CODE (type2);
1289 is_int1 = is_integral_type (type1);
1290 is_int2 = is_integral_type (type2);
1292 if (is_int1 && is_int2)
1293 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1295 else if ((code1 == TYPE_CODE_FLT || is_int1)
1296 && (code2 == TYPE_CODE_FLT || is_int2))
1297 return value_as_double (arg1) < value_as_double (arg2);
1298 else if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
1299 return value_as_address (arg1) < value_as_address (arg2);
1301 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1303 else if (code1 == TYPE_CODE_PTR && is_int2)
1304 return value_as_address (arg1) < (CORE_ADDR) value_as_long (arg2);
1305 else if (code2 == TYPE_CODE_PTR && is_int1)
1306 return (CORE_ADDR) value_as_long (arg1) < value_as_address (arg2);
1307 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1308 return value_strcmp (arg1, arg2) < 0;
1311 error ("Invalid type combination in ordering comparison.");
1316 /* The unary operators - and ~. Both free the argument ARG1. */
1319 value_neg (struct value *arg1)
1322 struct type *result_type = value_type (arg1);
1324 arg1 = coerce_ref (arg1);
1326 type = check_typedef (value_type (arg1));
1328 if (TYPE_CODE (type) == TYPE_CODE_FLT)
1329 return value_from_double (result_type, -value_as_double (arg1));
1330 else if (is_integral_type (type))
1332 /* Perform integral promotion for ANSI C/C++. FIXME: What about
1333 FORTRAN and (the deleted) chill ? */
1334 if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1335 result_type = builtin_type_int;
1337 return value_from_longest (result_type, -value_as_long (arg1));
1341 error ("Argument to negate operation not a number.");
1342 return 0; /* For lint -- never reached */
1347 value_complement (struct value *arg1)
1350 struct type *result_type = value_type (arg1);
1352 arg1 = coerce_ref (arg1);
1354 type = check_typedef (value_type (arg1));
1356 if (!is_integral_type (type))
1357 error ("Argument to complement operation not an integer or boolean.");
1359 /* Perform integral promotion for ANSI C/C++.
1360 FIXME: What about FORTRAN ? */
1361 if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
1362 result_type = builtin_type_int;
1364 return value_from_longest (result_type, ~value_as_long (arg1));
1367 /* The INDEX'th bit of SET value whose value_type is TYPE,
1368 and whose value_contents is valaddr.
1369 Return -1 if out of range, -2 other error. */
1372 value_bit_index (struct type *type, const bfd_byte *valaddr, int index)
1374 LONGEST low_bound, high_bound;
1377 struct type *range = TYPE_FIELD_TYPE (type, 0);
1378 if (get_discrete_bounds (range, &low_bound, &high_bound) < 0)
1380 if (index < low_bound || index > high_bound)
1382 rel_index = index - low_bound;
1383 word = unpack_long (builtin_type_unsigned_char,
1384 valaddr + (rel_index / TARGET_CHAR_BIT));
1385 rel_index %= TARGET_CHAR_BIT;
1386 if (BITS_BIG_ENDIAN)
1387 rel_index = TARGET_CHAR_BIT - 1 - rel_index;
1388 return (word >> rel_index) & 1;
1392 value_in (struct value *element, struct value *set)
1395 struct type *settype = check_typedef (value_type (set));
1396 struct type *eltype = check_typedef (value_type (element));
1397 if (TYPE_CODE (eltype) == TYPE_CODE_RANGE)
1398 eltype = TYPE_TARGET_TYPE (eltype);
1399 if (TYPE_CODE (settype) != TYPE_CODE_SET)
1400 error ("Second argument of 'IN' has wrong type");
1401 if (TYPE_CODE (eltype) != TYPE_CODE_INT
1402 && TYPE_CODE (eltype) != TYPE_CODE_CHAR
1403 && TYPE_CODE (eltype) != TYPE_CODE_ENUM
1404 && TYPE_CODE (eltype) != TYPE_CODE_BOOL)
1405 error ("First argument of 'IN' has wrong type");
1406 member = value_bit_index (settype, value_contents (set),
1407 value_as_long (element));
1409 error ("First argument of 'IN' not in range");
1410 return value_from_longest (LA_BOOL_TYPE, member);
1414 _initialize_valarith (void)