1 /* Perform arithmetic and other operations on values, for GDB.
3 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009,
5 2010 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 3 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, see <http://www.gnu.org/licenses/>. */
26 #include "expression.h"
29 #include "gdb_string.h"
35 /* Define whether or not the C operator '/' truncates towards zero for
36 differently signed operands (truncation direction is undefined in C). */
38 #ifndef TRUNCATION_TOWARDS_ZERO
39 #define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2)
42 void _initialize_valarith (void);
45 /* Given a pointer, return the size of its target.
46 If the pointer type is void *, then return 1.
47 If the target type is incomplete, then error out.
48 This isn't a general purpose function, but just a
49 helper for value_ptradd.
53 find_size_for_pointer_math (struct type *ptr_type)
56 struct type *ptr_target;
58 gdb_assert (TYPE_CODE (ptr_type) == TYPE_CODE_PTR);
59 ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
61 sz = TYPE_LENGTH (ptr_target);
64 if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
70 name = TYPE_NAME (ptr_target);
72 name = TYPE_TAG_NAME (ptr_target);
74 error (_("Cannot perform pointer math on incomplete types, "
75 "try casting to a known type, or void *."));
77 error (_("Cannot perform pointer math on incomplete type \"%s\", "
78 "try casting to a known type, or void *."), name);
84 /* Given a pointer ARG1 and an integral value ARG2, return the
85 result of C-style pointer arithmetic ARG1 + ARG2. */
88 value_ptradd (struct value *arg1, LONGEST arg2)
90 struct type *valptrtype;
93 arg1 = coerce_array (arg1);
94 valptrtype = check_typedef (value_type (arg1));
95 sz = find_size_for_pointer_math (valptrtype);
97 return value_from_pointer (valptrtype,
98 value_as_address (arg1) + sz * arg2);
101 /* Given two compatible pointer values ARG1 and ARG2, return the
102 result of C-style pointer arithmetic ARG1 - ARG2. */
105 value_ptrdiff (struct value *arg1, struct value *arg2)
107 struct type *type1, *type2;
110 arg1 = coerce_array (arg1);
111 arg2 = coerce_array (arg2);
112 type1 = check_typedef (value_type (arg1));
113 type2 = check_typedef (value_type (arg2));
115 gdb_assert (TYPE_CODE (type1) == TYPE_CODE_PTR);
116 gdb_assert (TYPE_CODE (type2) == TYPE_CODE_PTR);
118 if (TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)))
119 != TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type2))))
121 First argument of `-' is a pointer and second argument is neither\n\
122 an integer nor a pointer of the same type."));
124 sz = TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)));
127 warning (_("Type size unknown, assuming 1. "
128 "Try casting to a known type, or void *."));
132 return (value_as_long (arg1) - value_as_long (arg2)) / sz;
135 /* Return the value of ARRAY[IDX].
137 ARRAY may be of type TYPE_CODE_ARRAY or TYPE_CODE_STRING. If the
138 current language supports C-style arrays, it may also be TYPE_CODE_PTR.
139 To access TYPE_CODE_BITSTRING values, use value_bitstring_subscript.
141 See comments in value_coerce_array() for rationale for reason for
142 doing lower bounds adjustment here rather than there.
143 FIXME: Perhaps we should validate that the index is valid and if
144 verbosity is set, warn about invalid indices (but still use them). */
147 value_subscript (struct value *array, LONGEST index)
149 int c_style = current_language->c_style_arrays;
152 array = coerce_ref (array);
153 tarray = check_typedef (value_type (array));
155 if (TYPE_CODE (tarray) == TYPE_CODE_ARRAY
156 || TYPE_CODE (tarray) == TYPE_CODE_STRING)
158 struct type *range_type = TYPE_INDEX_TYPE (tarray);
159 LONGEST lowerbound, upperbound;
161 get_discrete_bounds (range_type, &lowerbound, &upperbound);
162 if (VALUE_LVAL (array) != lval_memory)
163 return value_subscripted_rvalue (array, index, lowerbound);
167 if (index >= lowerbound && index <= upperbound)
168 return value_subscripted_rvalue (array, index, lowerbound);
169 /* Emit warning unless we have an array of unknown size.
170 An array of unknown size has lowerbound 0 and upperbound -1. */
172 warning (_("array or string index out of range"));
173 /* fall doing C stuff */
178 array = value_coerce_array (array);
182 return value_ind (value_ptradd (array, index));
184 error (_("not an array or string"));
187 /* Return the value of EXPR[IDX], expr an aggregate rvalue
188 (eg, a vector register). This routine used to promote floats
189 to doubles, but no longer does. */
192 value_subscripted_rvalue (struct value *array, LONGEST index, int lowerbound)
194 struct type *array_type = check_typedef (value_type (array));
195 struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
196 unsigned int elt_size = TYPE_LENGTH (elt_type);
197 unsigned int elt_offs = elt_size * longest_to_int (index - lowerbound);
200 if (index < lowerbound || (!TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)
201 && elt_offs >= TYPE_LENGTH (array_type)))
202 error (_("no such vector element"));
204 v = allocate_value (elt_type);
205 if (VALUE_LVAL (array) == lval_memory && value_lazy (array))
206 set_value_lazy (v, 1);
208 memcpy (value_contents_writeable (v),
209 value_contents (array) + elt_offs, elt_size);
211 set_value_component_location (v, array);
212 VALUE_REGNUM (v) = VALUE_REGNUM (array);
213 VALUE_FRAME_ID (v) = VALUE_FRAME_ID (array);
214 set_value_offset (v, value_offset (array) + elt_offs);
218 /* Return the value of BITSTRING[IDX] as (boolean) type TYPE. */
221 value_bitstring_subscript (struct type *type,
222 struct value *bitstring, LONGEST index)
225 struct type *bitstring_type, *range_type;
227 int offset, byte, bit_index;
228 LONGEST lowerbound, upperbound;
230 bitstring_type = check_typedef (value_type (bitstring));
231 gdb_assert (TYPE_CODE (bitstring_type) == TYPE_CODE_BITSTRING);
233 range_type = TYPE_INDEX_TYPE (bitstring_type);
234 get_discrete_bounds (range_type, &lowerbound, &upperbound);
235 if (index < lowerbound || index > upperbound)
236 error (_("bitstring index out of range"));
239 offset = index / TARGET_CHAR_BIT;
240 byte = *((char *) value_contents (bitstring) + offset);
242 bit_index = index % TARGET_CHAR_BIT;
243 byte >>= (gdbarch_bits_big_endian (get_type_arch (bitstring_type)) ?
244 TARGET_CHAR_BIT - 1 - bit_index : bit_index);
246 v = value_from_longest (type, byte & 1);
248 set_value_bitpos (v, bit_index);
249 set_value_bitsize (v, 1);
250 set_value_component_location (v, bitstring);
251 VALUE_FRAME_ID (v) = VALUE_FRAME_ID (bitstring);
253 set_value_offset (v, offset + value_offset (bitstring));
259 /* Check to see if either argument is a structure, or a reference to
260 one. This is called so we know whether to go ahead with the normal
261 binop or look for a user defined function instead.
263 For now, we do not overload the `=' operator. */
266 binop_types_user_defined_p (enum exp_opcode op,
267 struct type *type1, struct type *type2)
269 if (op == BINOP_ASSIGN || op == BINOP_CONCAT)
272 type1 = check_typedef (type1);
273 if (TYPE_CODE (type1) == TYPE_CODE_REF)
274 type1 = check_typedef (TYPE_TARGET_TYPE (type1));
276 type2 = check_typedef (type1);
277 if (TYPE_CODE (type2) == TYPE_CODE_REF)
278 type2 = check_typedef (TYPE_TARGET_TYPE (type2));
280 return (TYPE_CODE (type1) == TYPE_CODE_STRUCT
281 || TYPE_CODE (type2) == TYPE_CODE_STRUCT);
284 /* Check to see if either argument is a structure, or a reference to
285 one. This is called so we know whether to go ahead with the normal
286 binop or look for a user defined function instead.
288 For now, we do not overload the `=' operator. */
291 binop_user_defined_p (enum exp_opcode op,
292 struct value *arg1, struct value *arg2)
294 return binop_types_user_defined_p (op, value_type (arg1), value_type (arg2));
297 /* Check to see if argument is a structure. This is called so
298 we know whether to go ahead with the normal unop or look for a
299 user defined function instead.
301 For now, we do not overload the `&' operator. */
304 unop_user_defined_p (enum exp_opcode op, struct value *arg1)
310 type1 = check_typedef (value_type (arg1));
313 if (TYPE_CODE (type1) == TYPE_CODE_STRUCT)
315 else if (TYPE_CODE (type1) == TYPE_CODE_REF)
316 type1 = TYPE_TARGET_TYPE (type1);
322 /* We know either arg1 or arg2 is a structure, so try to find the right
323 user defined function. Create an argument vector that calls
324 arg1.operator @ (arg1,arg2) and return that value (where '@' is any
325 binary operator which is legal for GNU C++).
327 OP is the operatore, and if it is BINOP_ASSIGN_MODIFY, then OTHEROP
328 is the opcode saying how to modify it. Otherwise, OTHEROP is
332 value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
333 enum exp_opcode otherop, enum noside noside)
335 struct value **argvec;
340 arg1 = coerce_ref (arg1);
341 arg2 = coerce_ref (arg2);
343 /* now we know that what we have to do is construct our
344 arg vector and find the right function to call it with. */
346 if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
347 error (_("Can't do that binary op on that type")); /* FIXME be explicit */
349 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
350 argvec[1] = value_addr (arg1);
354 /* make the right function name up */
355 strcpy (tstr, "operator__");
380 case BINOP_BITWISE_AND:
383 case BINOP_BITWISE_IOR:
386 case BINOP_BITWISE_XOR:
389 case BINOP_LOGICAL_AND:
392 case BINOP_LOGICAL_OR:
404 case BINOP_ASSIGN_MODIFY:
422 case BINOP_BITWISE_AND:
425 case BINOP_BITWISE_IOR:
428 case BINOP_BITWISE_XOR:
431 case BINOP_MOD: /* invalid */
433 error (_("Invalid binary operation specified."));
436 case BINOP_SUBSCRIPT:
457 case BINOP_MOD: /* invalid */
459 error (_("Invalid binary operation specified."));
462 argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
468 argvec[1] = argvec[0];
471 if (noside == EVAL_AVOID_SIDE_EFFECTS)
473 struct type *return_type;
476 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
477 return value_zero (return_type, VALUE_LVAL (arg1));
479 return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
481 error (_("member function %s not found"), tstr);
483 return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
487 /* We know that arg1 is a structure, so try to find a unary user
488 defined operator that matches the operator in question.
489 Create an argument vector that calls arg1.operator @ (arg1)
490 and return that value (where '@' is (almost) any unary operator which
491 is legal for GNU C++). */
494 value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
496 struct gdbarch *gdbarch = get_type_arch (value_type (arg1));
497 struct value **argvec;
498 char *ptr, *mangle_ptr;
499 char tstr[13], mangle_tstr[13];
500 int static_memfuncp, nargs;
502 arg1 = coerce_ref (arg1);
504 /* now we know that what we have to do is construct our
505 arg vector and find the right function to call it with. */
507 if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
508 error (_("Can't do that unary op on that type")); /* FIXME be explicit */
510 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
511 argvec[1] = value_addr (arg1);
516 /* make the right function name up */
517 strcpy (tstr, "operator__");
519 strcpy (mangle_tstr, "__");
520 mangle_ptr = mangle_tstr + 2;
523 case UNOP_PREINCREMENT:
526 case UNOP_PREDECREMENT:
529 case UNOP_POSTINCREMENT:
531 argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
535 case UNOP_POSTDECREMENT:
537 argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
541 case UNOP_LOGICAL_NOT:
544 case UNOP_COMPLEMENT:
557 error (_("Invalid unary operation specified."));
560 argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
566 argvec[1] = argvec[0];
570 if (noside == EVAL_AVOID_SIDE_EFFECTS)
572 struct type *return_type;
575 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
576 return value_zero (return_type, VALUE_LVAL (arg1));
578 return call_function_by_hand (argvec[0], nargs, argvec + 1);
580 error (_("member function %s not found"), tstr);
581 return 0; /* For lint -- never reached */
585 /* Concatenate two values with the following conditions:
587 (1) Both values must be either bitstring values or character string
588 values and the resulting value consists of the concatenation of
589 ARG1 followed by ARG2.
593 One value must be an integer value and the other value must be
594 either a bitstring value or character string value, which is
595 to be repeated by the number of times specified by the integer
599 (2) Boolean values are also allowed and are treated as bit string
602 (3) Character values are also allowed and are treated as character
603 string values of length 1.
607 value_concat (struct value *arg1, struct value *arg2)
609 struct value *inval1;
610 struct value *inval2;
611 struct value *outval = NULL;
612 int inval1len, inval2len;
616 struct type *type1 = check_typedef (value_type (arg1));
617 struct type *type2 = check_typedef (value_type (arg2));
618 struct type *char_type;
620 /* First figure out if we are dealing with two values to be concatenated
621 or a repeat count and a value to be repeated. INVAL1 is set to the
622 first of two concatenated values, or the repeat count. INVAL2 is set
623 to the second of the two concatenated values or the value to be
626 if (TYPE_CODE (type2) == TYPE_CODE_INT)
628 struct type *tmp = type1;
641 /* Now process the input values. */
643 if (TYPE_CODE (type1) == TYPE_CODE_INT)
645 /* We have a repeat count. Validate the second value and then
646 construct a value repeated that many times. */
647 if (TYPE_CODE (type2) == TYPE_CODE_STRING
648 || TYPE_CODE (type2) == TYPE_CODE_CHAR)
650 count = longest_to_int (value_as_long (inval1));
651 inval2len = TYPE_LENGTH (type2);
652 ptr = (char *) alloca (count * inval2len);
653 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
657 inchar = (char) unpack_long (type2,
658 value_contents (inval2));
659 for (idx = 0; idx < count; idx++)
661 *(ptr + idx) = inchar;
666 char_type = TYPE_TARGET_TYPE (type2);
668 for (idx = 0; idx < count; idx++)
670 memcpy (ptr + (idx * inval2len), value_contents (inval2),
674 outval = value_string (ptr, count * inval2len, char_type);
676 else if (TYPE_CODE (type2) == TYPE_CODE_BITSTRING
677 || TYPE_CODE (type2) == TYPE_CODE_BOOL)
679 error (_("unimplemented support for bitstring/boolean repeats"));
683 error (_("can't repeat values of that type"));
686 else if (TYPE_CODE (type1) == TYPE_CODE_STRING
687 || TYPE_CODE (type1) == TYPE_CODE_CHAR)
689 /* We have two character strings to concatenate. */
690 if (TYPE_CODE (type2) != TYPE_CODE_STRING
691 && TYPE_CODE (type2) != TYPE_CODE_CHAR)
693 error (_("Strings can only be concatenated with other strings."));
695 inval1len = TYPE_LENGTH (type1);
696 inval2len = TYPE_LENGTH (type2);
697 ptr = (char *) alloca (inval1len + inval2len);
698 if (TYPE_CODE (type1) == TYPE_CODE_CHAR)
702 *ptr = (char) unpack_long (type1, value_contents (inval1));
706 char_type = TYPE_TARGET_TYPE (type1);
708 memcpy (ptr, value_contents (inval1), inval1len);
710 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
713 (char) unpack_long (type2, value_contents (inval2));
717 memcpy (ptr + inval1len, value_contents (inval2), inval2len);
719 outval = value_string (ptr, inval1len + inval2len, char_type);
721 else if (TYPE_CODE (type1) == TYPE_CODE_BITSTRING
722 || TYPE_CODE (type1) == TYPE_CODE_BOOL)
724 /* We have two bitstrings to concatenate. */
725 if (TYPE_CODE (type2) != TYPE_CODE_BITSTRING
726 && TYPE_CODE (type2) != TYPE_CODE_BOOL)
728 error (_("Bitstrings or booleans can only be concatenated with other bitstrings or booleans."));
730 error (_("unimplemented support for bitstring/boolean concatenation."));
734 /* We don't know how to concatenate these operands. */
735 error (_("illegal operands for concatenation."));
740 /* Integer exponentiation: V1**V2, where both arguments are
741 integers. Requires V1 != 0 if V2 < 0. Returns 1 for 0 ** 0. */
743 integer_pow (LONGEST v1, LONGEST v2)
748 error (_("Attempt to raise 0 to negative power."));
754 /* The Russian Peasant's Algorithm */
770 /* Integer exponentiation: V1**V2, where both arguments are
771 integers. Requires V1 != 0 if V2 < 0. Returns 1 for 0 ** 0. */
773 uinteger_pow (ULONGEST v1, LONGEST v2)
778 error (_("Attempt to raise 0 to negative power."));
784 /* The Russian Peasant's Algorithm */
800 /* Obtain decimal value of arguments for binary operation, converting from
801 other types if one of them is not decimal floating point. */
803 value_args_as_decimal (struct value *arg1, struct value *arg2,
804 gdb_byte *x, int *len_x, enum bfd_endian *byte_order_x,
805 gdb_byte *y, int *len_y, enum bfd_endian *byte_order_y)
807 struct type *type1, *type2;
809 type1 = check_typedef (value_type (arg1));
810 type2 = check_typedef (value_type (arg2));
812 /* At least one of the arguments must be of decimal float type. */
813 gdb_assert (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
814 || TYPE_CODE (type2) == TYPE_CODE_DECFLOAT);
816 if (TYPE_CODE (type1) == TYPE_CODE_FLT
817 || TYPE_CODE (type2) == TYPE_CODE_FLT)
818 /* The DFP extension to the C language does not allow mixing of
819 * decimal float types with other float types in expressions
820 * (see WDTR 24732, page 12). */
821 error (_("Mixing decimal floating types with other floating types is not allowed."));
823 /* Obtain decimal value of arg1, converting from other types
826 if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
828 *byte_order_x = gdbarch_byte_order (get_type_arch (type1));
829 *len_x = TYPE_LENGTH (type1);
830 memcpy (x, value_contents (arg1), *len_x);
832 else if (is_integral_type (type1))
834 *byte_order_x = gdbarch_byte_order (get_type_arch (type2));
835 *len_x = TYPE_LENGTH (type2);
836 decimal_from_integral (arg1, x, *len_x, *byte_order_x);
839 error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
842 /* Obtain decimal value of arg2, converting from other types
845 if (TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
847 *byte_order_y = gdbarch_byte_order (get_type_arch (type2));
848 *len_y = TYPE_LENGTH (type2);
849 memcpy (y, value_contents (arg2), *len_y);
851 else if (is_integral_type (type2))
853 *byte_order_y = gdbarch_byte_order (get_type_arch (type1));
854 *len_y = TYPE_LENGTH (type1);
855 decimal_from_integral (arg2, y, *len_y, *byte_order_y);
858 error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
862 /* Perform a binary operation on two operands which have reasonable
863 representations as integers or floats. This includes booleans,
864 characters, integers, or floats.
865 Does not support addition and subtraction on pointers;
866 use value_ptradd, value_ptrsub or value_ptrdiff for those operations. */
869 value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
872 struct type *type1, *type2, *result_type;
874 arg1 = coerce_ref (arg1);
875 arg2 = coerce_ref (arg2);
877 type1 = check_typedef (value_type (arg1));
878 type2 = check_typedef (value_type (arg2));
880 if ((TYPE_CODE (type1) != TYPE_CODE_FLT
881 && TYPE_CODE (type1) != TYPE_CODE_DECFLOAT
882 && !is_integral_type (type1))
883 || (TYPE_CODE (type2) != TYPE_CODE_FLT
884 && TYPE_CODE (type2) != TYPE_CODE_DECFLOAT
885 && !is_integral_type (type2)))
886 error (_("Argument to arithmetic operation not a number or boolean."));
888 if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
889 || TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
891 int len_v1, len_v2, len_v;
892 enum bfd_endian byte_order_v1, byte_order_v2, byte_order_v;
893 gdb_byte v1[16], v2[16];
896 /* If only one type is decimal float, use its type.
897 Otherwise use the bigger type. */
898 if (TYPE_CODE (type1) != TYPE_CODE_DECFLOAT)
900 else if (TYPE_CODE (type2) != TYPE_CODE_DECFLOAT)
902 else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
907 len_v = TYPE_LENGTH (result_type);
908 byte_order_v = gdbarch_byte_order (get_type_arch (result_type));
910 value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
911 v2, &len_v2, &byte_order_v2);
920 decimal_binop (op, v1, len_v1, byte_order_v1,
921 v2, len_v2, byte_order_v2,
922 v, len_v, byte_order_v);
926 error (_("Operation not valid for decimal floating point number."));
929 val = value_from_decfloat (result_type, v);
931 else if (TYPE_CODE (type1) == TYPE_CODE_FLT
932 || TYPE_CODE (type2) == TYPE_CODE_FLT)
934 /* FIXME-if-picky-about-floating-accuracy: Should be doing this
935 in target format. real.c in GCC probably has the necessary
937 DOUBLEST v1, v2, v = 0;
939 v1 = value_as_double (arg1);
940 v2 = value_as_double (arg2);
964 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
968 v = v1 < v2 ? v1 : v2;
972 v = v1 > v2 ? v1 : v2;
976 error (_("Integer-only operation on floating point number."));
979 /* If only one type is float, use its type.
980 Otherwise use the bigger type. */
981 if (TYPE_CODE (type1) != TYPE_CODE_FLT)
983 else if (TYPE_CODE (type2) != TYPE_CODE_FLT)
985 else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
990 val = allocate_value (result_type);
991 store_typed_floating (value_contents_raw (val), value_type (val), v);
993 else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
994 || TYPE_CODE (type2) == TYPE_CODE_BOOL)
996 LONGEST v1, v2, v = 0;
998 v1 = value_as_long (arg1);
999 v2 = value_as_long (arg2);
1003 case BINOP_BITWISE_AND:
1007 case BINOP_BITWISE_IOR:
1011 case BINOP_BITWISE_XOR:
1019 case BINOP_NOTEQUAL:
1024 error (_("Invalid operation on booleans."));
1027 result_type = type1;
1029 val = allocate_value (result_type);
1030 store_signed_integer (value_contents_raw (val),
1031 TYPE_LENGTH (result_type),
1032 gdbarch_byte_order (get_type_arch (result_type)),
1036 /* Integral operations here. */
1038 /* Determine type length of the result, and if the operation should
1039 be done unsigned. For exponentiation and shift operators,
1040 use the length and type of the left operand. Otherwise,
1041 use the signedness of the operand with the greater length.
1042 If both operands are of equal length, use unsigned operation
1043 if one of the operands is unsigned. */
1044 if (op == BINOP_RSH || op == BINOP_LSH || op == BINOP_EXP)
1045 result_type = type1;
1046 else if (TYPE_LENGTH (type1) > TYPE_LENGTH (type2))
1047 result_type = type1;
1048 else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
1049 result_type = type2;
1050 else if (TYPE_UNSIGNED (type1))
1051 result_type = type1;
1052 else if (TYPE_UNSIGNED (type2))
1053 result_type = type2;
1055 result_type = type1;
1057 if (TYPE_UNSIGNED (result_type))
1059 LONGEST v2_signed = value_as_long (arg2);
1060 ULONGEST v1, v2, v = 0;
1062 v1 = (ULONGEST) value_as_long (arg1);
1063 v2 = (ULONGEST) v2_signed;
1084 error (_("Division by zero"));
1088 v = uinteger_pow (v1, v2_signed);
1095 error (_("Division by zero"));
1099 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1100 v1 mod 0 has a defined value, v1. */
1108 /* Note floor(v1/v2) == v1/v2 for unsigned. */
1121 case BINOP_BITWISE_AND:
1125 case BINOP_BITWISE_IOR:
1129 case BINOP_BITWISE_XOR:
1133 case BINOP_LOGICAL_AND:
1137 case BINOP_LOGICAL_OR:
1142 v = v1 < v2 ? v1 : v2;
1146 v = v1 > v2 ? v1 : v2;
1153 case BINOP_NOTEQUAL:
1174 error (_("Invalid binary operation on numbers."));
1177 val = allocate_value (result_type);
1178 store_unsigned_integer (value_contents_raw (val),
1179 TYPE_LENGTH (value_type (val)),
1181 (get_type_arch (result_type)),
1186 LONGEST v1, v2, v = 0;
1188 v1 = value_as_long (arg1);
1189 v2 = value_as_long (arg2);
1210 error (_("Division by zero"));
1214 v = integer_pow (v1, v2);
1221 error (_("Division by zero"));
1225 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1226 X mod 0 has a defined value, X. */
1234 /* Compute floor. */
1235 if (TRUNCATION_TOWARDS_ZERO && (v < 0) && ((v1 % v2) != 0))
1251 case BINOP_BITWISE_AND:
1255 case BINOP_BITWISE_IOR:
1259 case BINOP_BITWISE_XOR:
1263 case BINOP_LOGICAL_AND:
1267 case BINOP_LOGICAL_OR:
1272 v = v1 < v2 ? v1 : v2;
1276 v = v1 > v2 ? v1 : v2;
1283 case BINOP_NOTEQUAL:
1304 error (_("Invalid binary operation on numbers."));
1307 val = allocate_value (result_type);
1308 store_signed_integer (value_contents_raw (val),
1309 TYPE_LENGTH (value_type (val)),
1311 (get_type_arch (result_type)),
1319 /* Simulate the C operator ! -- return 1 if ARG1 contains zero. */
1322 value_logical_not (struct value *arg1)
1328 arg1 = coerce_array (arg1);
1329 type1 = check_typedef (value_type (arg1));
1331 if (TYPE_CODE (type1) == TYPE_CODE_FLT)
1332 return 0 == value_as_double (arg1);
1333 else if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
1334 return decimal_is_zero (value_contents (arg1), TYPE_LENGTH (type1),
1335 gdbarch_byte_order (get_type_arch (type1)));
1337 len = TYPE_LENGTH (type1);
1338 p = value_contents (arg1);
1349 /* Perform a comparison on two string values (whose content are not
1350 necessarily null terminated) based on their length */
1353 value_strcmp (struct value *arg1, struct value *arg2)
1355 int len1 = TYPE_LENGTH (value_type (arg1));
1356 int len2 = TYPE_LENGTH (value_type (arg2));
1357 const gdb_byte *s1 = value_contents (arg1);
1358 const gdb_byte *s2 = value_contents (arg2);
1359 int i, len = len1 < len2 ? len1 : len2;
1361 for (i = 0; i < len; i++)
1365 else if (s1[i] > s2[i])
1373 else if (len1 > len2)
1379 /* Simulate the C operator == by returning a 1
1380 iff ARG1 and ARG2 have equal contents. */
1383 value_equal (struct value *arg1, struct value *arg2)
1388 struct type *type1, *type2;
1389 enum type_code code1;
1390 enum type_code code2;
1391 int is_int1, is_int2;
1393 arg1 = coerce_array (arg1);
1394 arg2 = coerce_array (arg2);
1396 type1 = check_typedef (value_type (arg1));
1397 type2 = check_typedef (value_type (arg2));
1398 code1 = TYPE_CODE (type1);
1399 code2 = TYPE_CODE (type2);
1400 is_int1 = is_integral_type (type1);
1401 is_int2 = is_integral_type (type2);
1403 if (is_int1 && is_int2)
1404 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1406 else if ((code1 == TYPE_CODE_FLT || is_int1)
1407 && (code2 == TYPE_CODE_FLT || is_int2))
1409 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1410 `long double' values are returned in static storage (m68k). */
1411 DOUBLEST d = value_as_double (arg1);
1413 return d == value_as_double (arg2);
1415 else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
1416 && (code2 == TYPE_CODE_DECFLOAT || is_int2))
1418 gdb_byte v1[16], v2[16];
1420 enum bfd_endian byte_order_v1, byte_order_v2;
1422 value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
1423 v2, &len_v2, &byte_order_v2);
1425 return decimal_compare (v1, len_v1, byte_order_v1,
1426 v2, len_v2, byte_order_v2) == 0;
1429 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1431 else if (code1 == TYPE_CODE_PTR && is_int2)
1432 return value_as_address (arg1) == (CORE_ADDR) value_as_long (arg2);
1433 else if (code2 == TYPE_CODE_PTR && is_int1)
1434 return (CORE_ADDR) value_as_long (arg1) == value_as_address (arg2);
1436 else if (code1 == code2
1437 && ((len = (int) TYPE_LENGTH (type1))
1438 == (int) TYPE_LENGTH (type2)))
1440 p1 = value_contents (arg1);
1441 p2 = value_contents (arg2);
1449 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1451 return value_strcmp (arg1, arg2) == 0;
1455 error (_("Invalid type combination in equality test."));
1456 return 0; /* For lint -- never reached */
1460 /* Compare values based on their raw contents. Useful for arrays since
1461 value_equal coerces them to pointers, thus comparing just the address
1462 of the array instead of its contents. */
1465 value_equal_contents (struct value *arg1, struct value *arg2)
1467 struct type *type1, *type2;
1469 type1 = check_typedef (value_type (arg1));
1470 type2 = check_typedef (value_type (arg2));
1472 return (TYPE_CODE (type1) == TYPE_CODE (type2)
1473 && TYPE_LENGTH (type1) == TYPE_LENGTH (type2)
1474 && memcmp (value_contents (arg1), value_contents (arg2),
1475 TYPE_LENGTH (type1)) == 0);
1478 /* Simulate the C operator < by returning 1
1479 iff ARG1's contents are less than ARG2's. */
1482 value_less (struct value *arg1, struct value *arg2)
1484 enum type_code code1;
1485 enum type_code code2;
1486 struct type *type1, *type2;
1487 int is_int1, is_int2;
1489 arg1 = coerce_array (arg1);
1490 arg2 = coerce_array (arg2);
1492 type1 = check_typedef (value_type (arg1));
1493 type2 = check_typedef (value_type (arg2));
1494 code1 = TYPE_CODE (type1);
1495 code2 = TYPE_CODE (type2);
1496 is_int1 = is_integral_type (type1);
1497 is_int2 = is_integral_type (type2);
1499 if (is_int1 && is_int2)
1500 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1502 else if ((code1 == TYPE_CODE_FLT || is_int1)
1503 && (code2 == TYPE_CODE_FLT || is_int2))
1505 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1506 `long double' values are returned in static storage (m68k). */
1507 DOUBLEST d = value_as_double (arg1);
1509 return d < value_as_double (arg2);
1511 else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
1512 && (code2 == TYPE_CODE_DECFLOAT || is_int2))
1514 gdb_byte v1[16], v2[16];
1516 enum bfd_endian byte_order_v1, byte_order_v2;
1518 value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
1519 v2, &len_v2, &byte_order_v2);
1521 return decimal_compare (v1, len_v1, byte_order_v1,
1522 v2, len_v2, byte_order_v2) == -1;
1524 else if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
1525 return value_as_address (arg1) < value_as_address (arg2);
1527 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1529 else if (code1 == TYPE_CODE_PTR && is_int2)
1530 return value_as_address (arg1) < (CORE_ADDR) value_as_long (arg2);
1531 else if (code2 == TYPE_CODE_PTR && is_int1)
1532 return (CORE_ADDR) value_as_long (arg1) < value_as_address (arg2);
1533 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1534 return value_strcmp (arg1, arg2) < 0;
1537 error (_("Invalid type combination in ordering comparison."));
1542 /* The unary operators +, - and ~. They free the argument ARG1. */
1545 value_pos (struct value *arg1)
1549 arg1 = coerce_ref (arg1);
1550 type = check_typedef (value_type (arg1));
1552 if (TYPE_CODE (type) == TYPE_CODE_FLT)
1553 return value_from_double (type, value_as_double (arg1));
1554 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
1555 return value_from_decfloat (type, value_contents (arg1));
1556 else if (is_integral_type (type))
1558 return value_from_longest (type, value_as_long (arg1));
1562 error ("Argument to positive operation not a number.");
1563 return 0; /* For lint -- never reached */
1568 value_neg (struct value *arg1)
1572 arg1 = coerce_ref (arg1);
1573 type = check_typedef (value_type (arg1));
1575 if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
1577 struct value *val = allocate_value (type);
1578 int len = TYPE_LENGTH (type);
1579 gdb_byte decbytes[16]; /* a decfloat is at most 128 bits long */
1581 memcpy (decbytes, value_contents (arg1), len);
1583 if (gdbarch_byte_order (get_type_arch (type)) == BFD_ENDIAN_LITTLE)
1584 decbytes[len-1] = decbytes[len - 1] | 0x80;
1586 decbytes[0] = decbytes[0] | 0x80;
1588 memcpy (value_contents_raw (val), decbytes, len);
1591 else if (TYPE_CODE (type) == TYPE_CODE_FLT)
1592 return value_from_double (type, -value_as_double (arg1));
1593 else if (is_integral_type (type))
1595 return value_from_longest (type, -value_as_long (arg1));
1599 error (_("Argument to negate operation not a number."));
1600 return 0; /* For lint -- never reached */
1605 value_complement (struct value *arg1)
1609 arg1 = coerce_ref (arg1);
1610 type = check_typedef (value_type (arg1));
1612 if (!is_integral_type (type))
1613 error (_("Argument to complement operation not an integer or boolean."));
1615 return value_from_longest (type, ~value_as_long (arg1));
1618 /* The INDEX'th bit of SET value whose value_type is TYPE,
1619 and whose value_contents is valaddr.
1620 Return -1 if out of range, -2 other error. */
1623 value_bit_index (struct type *type, const gdb_byte *valaddr, int index)
1625 struct gdbarch *gdbarch = get_type_arch (type);
1626 LONGEST low_bound, high_bound;
1629 struct type *range = TYPE_INDEX_TYPE (type);
1631 if (get_discrete_bounds (range, &low_bound, &high_bound) < 0)
1633 if (index < low_bound || index > high_bound)
1635 rel_index = index - low_bound;
1636 word = extract_unsigned_integer (valaddr + (rel_index / TARGET_CHAR_BIT), 1,
1637 gdbarch_byte_order (gdbarch));
1638 rel_index %= TARGET_CHAR_BIT;
1639 if (gdbarch_bits_big_endian (gdbarch))
1640 rel_index = TARGET_CHAR_BIT - 1 - rel_index;
1641 return (word >> rel_index) & 1;
1645 value_in (struct value *element, struct value *set)
1648 struct type *settype = check_typedef (value_type (set));
1649 struct type *eltype = check_typedef (value_type (element));
1651 if (TYPE_CODE (eltype) == TYPE_CODE_RANGE)
1652 eltype = TYPE_TARGET_TYPE (eltype);
1653 if (TYPE_CODE (settype) != TYPE_CODE_SET)
1654 error (_("Second argument of 'IN' has wrong type"));
1655 if (TYPE_CODE (eltype) != TYPE_CODE_INT
1656 && TYPE_CODE (eltype) != TYPE_CODE_CHAR
1657 && TYPE_CODE (eltype) != TYPE_CODE_ENUM
1658 && TYPE_CODE (eltype) != TYPE_CODE_BOOL)
1659 error (_("First argument of 'IN' has wrong type"));
1660 member = value_bit_index (settype, value_contents (set),
1661 value_as_long (element));
1663 error (_("First argument of 'IN' not in range"));
1668 _initialize_valarith (void)