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
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 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 static struct value
*value_subscripted_rvalue (struct value
*, struct value
*, int);
44 void _initialize_valarith (void);
47 /* Given a pointer, return the size of its target.
48 If the pointer type is void *, then return 1.
49 If the target type is incomplete, then error out.
50 This isn't a general purpose function, but just a
51 helper for value_sub & value_add.
55 find_size_for_pointer_math (struct type
*ptr_type
)
58 struct type
*ptr_target
;
60 ptr_target
= check_typedef (TYPE_TARGET_TYPE (ptr_type
));
62 sz
= TYPE_LENGTH (ptr_target
);
65 if (TYPE_CODE (ptr_type
) == TYPE_CODE_VOID
)
71 name
= TYPE_NAME (ptr_target
);
73 name
= TYPE_TAG_NAME (ptr_target
);
75 error (_("Cannot perform pointer math on incomplete types, "
76 "try casting to a known type, or void *."));
78 error (_("Cannot perform pointer math on incomplete type \"%s\", "
79 "try casting to a known type, or void *."), name
);
86 value_add (struct value
*arg1
, struct value
*arg2
)
91 struct type
*type1
, *type2
, *valptrtype
;
93 arg1
= coerce_array (arg1
);
94 arg2
= coerce_array (arg2
);
95 type1
= check_typedef (value_type (arg1
));
96 type2
= check_typedef (value_type (arg2
));
98 if ((TYPE_CODE (type1
) == TYPE_CODE_PTR
99 || TYPE_CODE (type2
) == TYPE_CODE_PTR
)
101 (is_integral_type (type1
) || is_integral_type (type2
)))
102 /* Exactly one argument is a pointer, and one is an integer. */
104 struct value
*retval
;
106 if (TYPE_CODE (type1
) == TYPE_CODE_PTR
)
119 sz
= find_size_for_pointer_math (valptrtype
);
121 retval
= value_from_pointer (valptrtype
,
122 value_as_address (valptr
)
123 + (sz
* value_as_long (valint
)));
127 return value_binop (arg1
, arg2
, BINOP_ADD
);
131 value_sub (struct value
*arg1
, struct value
*arg2
)
133 struct type
*type1
, *type2
;
134 arg1
= coerce_array (arg1
);
135 arg2
= coerce_array (arg2
);
136 type1
= check_typedef (value_type (arg1
));
137 type2
= check_typedef (value_type (arg2
));
139 if (TYPE_CODE (type1
) == TYPE_CODE_PTR
)
141 if (is_integral_type (type2
))
143 /* pointer - integer. */
144 LONGEST sz
= find_size_for_pointer_math (type1
);
146 return value_from_pointer (type1
,
147 (value_as_address (arg1
)
148 - (sz
* value_as_long (arg2
))));
150 else if (TYPE_CODE (type2
) == TYPE_CODE_PTR
151 && TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1
)))
152 == TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type2
))))
154 /* pointer to <type x> - pointer to <type x>. */
155 LONGEST sz
= TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1
)));
156 return value_from_longest
157 (builtin_type_long
, /* FIXME -- should be ptrdiff_t */
158 (value_as_long (arg1
) - value_as_long (arg2
)) / sz
);
163 First argument of `-' is a pointer and second argument is neither\n\
164 an integer nor a pointer of the same type."));
168 return value_binop (arg1
, arg2
, BINOP_SUB
);
171 /* Return the value of ARRAY[IDX].
172 See comments in value_coerce_array() for rationale for reason for
173 doing lower bounds adjustment here rather than there.
174 FIXME: Perhaps we should validate that the index is valid and if
175 verbosity is set, warn about invalid indices (but still use them). */
178 value_subscript (struct value
*array
, struct value
*idx
)
181 int c_style
= current_language
->c_style_arrays
;
184 array
= coerce_ref (array
);
185 tarray
= check_typedef (value_type (array
));
187 if (TYPE_CODE (tarray
) == TYPE_CODE_ARRAY
188 || TYPE_CODE (tarray
) == TYPE_CODE_STRING
)
190 struct type
*range_type
= TYPE_INDEX_TYPE (tarray
);
191 LONGEST lowerbound
, upperbound
;
192 get_discrete_bounds (range_type
, &lowerbound
, &upperbound
);
194 if (VALUE_LVAL (array
) != lval_memory
)
195 return value_subscripted_rvalue (array
, idx
, lowerbound
);
199 LONGEST index
= value_as_long (idx
);
200 if (index
>= lowerbound
&& index
<= upperbound
)
201 return value_subscripted_rvalue (array
, idx
, lowerbound
);
202 /* Emit warning unless we have an array of unknown size.
203 An array of unknown size has lowerbound 0 and upperbound -1. */
205 warning (_("array or string index out of range"));
206 /* fall doing C stuff */
212 bound
= value_from_longest (builtin_type_int
, (LONGEST
) lowerbound
);
213 idx
= value_sub (idx
, bound
);
216 array
= value_coerce_array (array
);
219 if (TYPE_CODE (tarray
) == TYPE_CODE_BITSTRING
)
221 struct type
*range_type
= TYPE_INDEX_TYPE (tarray
);
222 LONGEST index
= value_as_long (idx
);
224 int offset
, byte
, bit_index
;
225 LONGEST lowerbound
, upperbound
;
226 get_discrete_bounds (range_type
, &lowerbound
, &upperbound
);
227 if (index
< lowerbound
|| index
> upperbound
)
228 error (_("bitstring index out of range"));
230 offset
= index
/ TARGET_CHAR_BIT
;
231 byte
= *((char *) value_contents (array
) + offset
);
232 bit_index
= index
% TARGET_CHAR_BIT
;
233 byte
>>= (gdbarch_bits_big_endian (current_gdbarch
) ?
234 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."));
746 /* Obtain decimal value of arguments for binary operation, converting from
747 other types if one of them is not decimal floating point. */
749 value_args_as_decimal (struct value
*arg1
, struct value
*arg2
,
750 gdb_byte
*x
, int *len_x
, gdb_byte
*y
, int *len_y
)
752 struct type
*type1
, *type2
;
754 type1
= check_typedef (value_type (arg1
));
755 type2
= check_typedef (value_type (arg2
));
757 /* At least one of the arguments must be of decimal float type. */
758 gdb_assert (TYPE_CODE (type1
) == TYPE_CODE_DECFLOAT
759 || TYPE_CODE (type2
) == TYPE_CODE_DECFLOAT
);
761 if (TYPE_CODE (type1
) == TYPE_CODE_FLT
762 || TYPE_CODE (type2
) == TYPE_CODE_FLT
)
763 /* The DFP extension to the C language does not allow mixing of
764 * decimal float types with other float types in expressions
765 * (see WDTR 24732, page 12). */
766 error (_("Mixing decimal floating types with other floating types is not allowed."));
768 /* Obtain decimal value of arg1, converting from other types
771 if (TYPE_CODE (type1
) == TYPE_CODE_DECFLOAT
)
773 *len_x
= TYPE_LENGTH (type1
);
774 memcpy (x
, value_contents (arg1
), *len_x
);
776 else if (is_integral_type (type1
))
778 *len_x
= TYPE_LENGTH (type2
);
779 decimal_from_integral (arg1
, x
, *len_x
);
782 error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1
),
785 /* Obtain decimal value of arg2, converting from other types
788 if (TYPE_CODE (type2
) == TYPE_CODE_DECFLOAT
)
790 *len_y
= TYPE_LENGTH (type2
);
791 memcpy (y
, value_contents (arg2
), *len_y
);
793 else if (is_integral_type (type2
))
795 *len_y
= TYPE_LENGTH (type1
);
796 decimal_from_integral (arg2
, y
, *len_y
);
799 error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1
),
803 /* Perform a binary operation on two operands which have reasonable
804 representations as integers or floats. This includes booleans,
805 characters, integers, or floats.
806 Does not support addition and subtraction on pointers;
807 use value_add or value_sub if you want to handle those possibilities. */
810 value_binop (struct value
*arg1
, struct value
*arg2
, enum exp_opcode op
)
813 struct type
*type1
, *type2
;
815 arg1
= coerce_ref (arg1
);
816 arg2
= coerce_ref (arg2
);
817 type1
= check_typedef (value_type (arg1
));
818 type2
= check_typedef (value_type (arg2
));
820 if ((TYPE_CODE (type1
) != TYPE_CODE_FLT
821 && TYPE_CODE (type1
) != TYPE_CODE_DECFLOAT
&& !is_integral_type (type1
))
823 (TYPE_CODE (type2
) != TYPE_CODE_FLT
824 && TYPE_CODE (type2
) != TYPE_CODE_DECFLOAT
&& !is_integral_type (type2
)))
825 error (_("Argument to arithmetic operation not a number or boolean."));
827 if (TYPE_CODE (type1
) == TYPE_CODE_DECFLOAT
829 TYPE_CODE (type2
) == TYPE_CODE_DECFLOAT
)
832 int len_v1
, len_v2
, len_v
;
833 gdb_byte v1
[16], v2
[16];
836 value_args_as_decimal (arg1
, arg2
, v1
, &len_v1
, v2
, &len_v2
);
845 decimal_binop (op
, v1
, len_v1
, v2
, len_v2
, v
, &len_v
);
849 error (_("Operation not valid for decimal floating point number."));
852 if (TYPE_CODE (type1
) != TYPE_CODE_DECFLOAT
)
853 /* If arg1 is not a decimal float, the type of the result is the type
854 of the decimal float argument, arg2. */
856 else if (TYPE_CODE (type2
) != TYPE_CODE_DECFLOAT
)
857 /* Same logic, for the case where arg2 is not a decimal float. */
860 /* len_v is equal either to len_v1 or to len_v2. the type of the
861 result is the type of the argument with the same length as v. */
862 v_type
= (len_v
== len_v1
)? type1
: type2
;
864 val
= value_from_decfloat (v_type
, v
);
866 else if (TYPE_CODE (type1
) == TYPE_CODE_FLT
868 TYPE_CODE (type2
) == TYPE_CODE_FLT
)
870 /* FIXME-if-picky-about-floating-accuracy: Should be doing this
871 in target format. real.c in GCC probably has the necessary
873 DOUBLEST v1
, v2
, v
= 0;
874 v1
= value_as_double (arg1
);
875 v2
= value_as_double (arg2
);
898 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno
));
902 error (_("Integer-only operation on floating point number."));
905 /* If either arg was long double, make sure that value is also long
908 if (TYPE_LENGTH (type1
) * 8 > gdbarch_double_bit (current_gdbarch
)
909 || TYPE_LENGTH (type2
) * 8 > gdbarch_double_bit (current_gdbarch
))
910 val
= allocate_value (builtin_type_long_double
);
912 val
= allocate_value (builtin_type_double
);
914 store_typed_floating (value_contents_raw (val
), value_type (val
), v
);
916 else if (TYPE_CODE (type1
) == TYPE_CODE_BOOL
918 TYPE_CODE (type2
) == TYPE_CODE_BOOL
)
920 LONGEST v1
, v2
, v
= 0;
921 v1
= value_as_long (arg1
);
922 v2
= value_as_long (arg2
);
926 case BINOP_BITWISE_AND
:
930 case BINOP_BITWISE_IOR
:
934 case BINOP_BITWISE_XOR
:
947 error (_("Invalid operation on booleans."));
950 val
= allocate_value (type1
);
951 store_signed_integer (value_contents_raw (val
),
956 /* Integral operations here. */
957 /* FIXME: Also mixed integral/booleans, with result an integer. */
958 /* FIXME: This implements ANSI C rules (also correct for C++).
959 What about FORTRAN and (the deleted) chill ? */
961 unsigned int promoted_len1
= TYPE_LENGTH (type1
);
962 unsigned int promoted_len2
= TYPE_LENGTH (type2
);
963 int is_unsigned1
= TYPE_UNSIGNED (type1
);
964 int is_unsigned2
= TYPE_UNSIGNED (type2
);
965 unsigned int result_len
;
966 int unsigned_operation
;
968 /* Determine type length and signedness after promotion for
970 if (promoted_len1
< TYPE_LENGTH (builtin_type_int
))
973 promoted_len1
= TYPE_LENGTH (builtin_type_int
);
975 if (promoted_len2
< TYPE_LENGTH (builtin_type_int
))
978 promoted_len2
= TYPE_LENGTH (builtin_type_int
);
981 /* Determine type length of the result, and if the operation should
983 Use the signedness of the operand with the greater length.
984 If both operands are of equal length, use unsigned operation
985 if one of the operands is unsigned. */
986 if (op
== BINOP_RSH
|| op
== BINOP_LSH
)
988 /* In case of the shift operators the type of the result only
989 depends on the type of the left operand. */
990 unsigned_operation
= is_unsigned1
;
991 result_len
= promoted_len1
;
993 else if (promoted_len1
> promoted_len2
)
995 unsigned_operation
= is_unsigned1
;
996 result_len
= promoted_len1
;
998 else if (promoted_len2
> promoted_len1
)
1000 unsigned_operation
= is_unsigned2
;
1001 result_len
= promoted_len2
;
1005 unsigned_operation
= is_unsigned1
|| is_unsigned2
;
1006 result_len
= promoted_len1
;
1009 if (unsigned_operation
)
1011 ULONGEST v1
, v2
, v
= 0;
1012 v1
= (ULONGEST
) value_as_long (arg1
);
1013 v2
= (ULONGEST
) value_as_long (arg2
);
1015 /* Truncate values to the type length of the result. */
1016 if (result_len
< sizeof (ULONGEST
))
1018 v1
&= ((LONGEST
) 1 << HOST_CHAR_BIT
* result_len
) - 1;
1019 v2
&= ((LONGEST
) 1 << HOST_CHAR_BIT
* result_len
) - 1;
1041 error (_("Division by zero"));
1048 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno
));
1056 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1057 v1 mod 0 has a defined value, v1. */
1065 /* Note floor(v1/v2) == v1/v2 for unsigned. */
1078 case BINOP_BITWISE_AND
:
1082 case BINOP_BITWISE_IOR
:
1086 case BINOP_BITWISE_XOR
:
1090 case BINOP_LOGICAL_AND
:
1094 case BINOP_LOGICAL_OR
:
1099 v
= v1
< v2
? v1
: v2
;
1103 v
= v1
> v2
? v1
: v2
;
1110 case BINOP_NOTEQUAL
:
1119 error (_("Invalid binary operation on numbers."));
1122 /* This is a kludge to get around the fact that we don't
1123 know how to determine the result type from the types of
1124 the operands. (I'm not really sure how much we feel the
1125 need to duplicate the exact rules of the current
1126 language. They can get really hairy. But not to do so
1127 makes it hard to document just what we *do* do). */
1129 /* Can't just call init_type because we wouldn't know what
1130 name to give the type. */
1131 val
= allocate_value
1132 (result_len
> gdbarch_long_bit (current_gdbarch
) / HOST_CHAR_BIT
1133 ? builtin_type_unsigned_long_long
1134 : builtin_type_unsigned_long
);
1135 store_unsigned_integer (value_contents_raw (val
),
1136 TYPE_LENGTH (value_type (val
)),
1141 LONGEST v1
, v2
, v
= 0;
1142 v1
= value_as_long (arg1
);
1143 v2
= value_as_long (arg2
);
1164 error (_("Division by zero"));
1171 error (_("Cannot perform exponentiation: %s"), safe_strerror (errno
));
1178 error (_("Division by zero"));
1182 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1183 X mod 0 has a defined value, X. */
1191 /* Compute floor. */
1192 if (TRUNCATION_TOWARDS_ZERO
&& (v
< 0) && ((v1
% v2
) != 0))
1208 case BINOP_BITWISE_AND
:
1212 case BINOP_BITWISE_IOR
:
1216 case BINOP_BITWISE_XOR
:
1220 case BINOP_LOGICAL_AND
:
1224 case BINOP_LOGICAL_OR
:
1229 v
= v1
< v2
? v1
: v2
;
1233 v
= v1
> v2
? v1
: v2
;
1245 error (_("Invalid binary operation on numbers."));
1248 /* This is a kludge to get around the fact that we don't
1249 know how to determine the result type from the types of
1250 the operands. (I'm not really sure how much we feel the
1251 need to duplicate the exact rules of the current
1252 language. They can get really hairy. But not to do so
1253 makes it hard to document just what we *do* do). */
1255 /* Can't just call init_type because we wouldn't know what
1256 name to give the type. */
1257 val
= allocate_value
1258 (result_len
> gdbarch_long_bit (current_gdbarch
) / HOST_CHAR_BIT
1259 ? builtin_type_long_long
1260 : builtin_type_long
);
1261 store_signed_integer (value_contents_raw (val
),
1262 TYPE_LENGTH (value_type (val
)),
1270 /* Simulate the C operator ! -- return 1 if ARG1 contains zero. */
1273 value_logical_not (struct value
*arg1
)
1279 arg1
= coerce_number (arg1
);
1280 type1
= check_typedef (value_type (arg1
));
1282 if (TYPE_CODE (type1
) == TYPE_CODE_FLT
)
1283 return 0 == value_as_double (arg1
);
1284 else if (TYPE_CODE (type1
) == TYPE_CODE_DECFLOAT
)
1285 return decimal_is_zero (value_contents (arg1
), TYPE_LENGTH (type1
));
1287 len
= TYPE_LENGTH (type1
);
1288 p
= value_contents (arg1
);
1299 /* Perform a comparison on two string values (whose content are not
1300 necessarily null terminated) based on their length */
1303 value_strcmp (struct value
*arg1
, struct value
*arg2
)
1305 int len1
= TYPE_LENGTH (value_type (arg1
));
1306 int len2
= TYPE_LENGTH (value_type (arg2
));
1307 const gdb_byte
*s1
= value_contents (arg1
);
1308 const gdb_byte
*s2
= value_contents (arg2
);
1309 int i
, len
= len1
< len2
? len1
: len2
;
1311 for (i
= 0; i
< len
; i
++)
1315 else if (s1
[i
] > s2
[i
])
1323 else if (len1
> len2
)
1329 /* Simulate the C operator == by returning a 1
1330 iff ARG1 and ARG2 have equal contents. */
1333 value_equal (struct value
*arg1
, struct value
*arg2
)
1338 struct type
*type1
, *type2
;
1339 enum type_code code1
;
1340 enum type_code code2
;
1341 int is_int1
, is_int2
;
1343 arg1
= coerce_array (arg1
);
1344 arg2
= coerce_array (arg2
);
1346 type1
= check_typedef (value_type (arg1
));
1347 type2
= check_typedef (value_type (arg2
));
1348 code1
= TYPE_CODE (type1
);
1349 code2
= TYPE_CODE (type2
);
1350 is_int1
= is_integral_type (type1
);
1351 is_int2
= is_integral_type (type2
);
1353 if (is_int1
&& is_int2
)
1354 return longest_to_int (value_as_long (value_binop (arg1
, arg2
,
1356 else if ((code1
== TYPE_CODE_FLT
|| is_int1
)
1357 && (code2
== TYPE_CODE_FLT
|| is_int2
))
1359 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1360 `long double' values are returned in static storage (m68k). */
1361 DOUBLEST d
= value_as_double (arg1
);
1362 return d
== value_as_double (arg2
);
1364 else if ((code1
== TYPE_CODE_DECFLOAT
|| is_int1
)
1365 && (code2
== TYPE_CODE_DECFLOAT
|| is_int2
))
1367 gdb_byte v1
[16], v2
[16];
1370 value_args_as_decimal (arg1
, arg2
, v1
, &len_v1
, v2
, &len_v2
);
1372 return decimal_compare (v1
, len_v1
, v2
, len_v2
) == 0;
1375 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1377 else if (code1
== TYPE_CODE_PTR
&& is_int2
)
1378 return value_as_address (arg1
) == (CORE_ADDR
) value_as_long (arg2
);
1379 else if (code2
== TYPE_CODE_PTR
&& is_int1
)
1380 return (CORE_ADDR
) value_as_long (arg1
) == value_as_address (arg2
);
1382 else if (code1
== code2
1383 && ((len
= (int) TYPE_LENGTH (type1
))
1384 == (int) TYPE_LENGTH (type2
)))
1386 p1
= value_contents (arg1
);
1387 p2
= value_contents (arg2
);
1395 else if (code1
== TYPE_CODE_STRING
&& code2
== TYPE_CODE_STRING
)
1397 return value_strcmp (arg1
, arg2
) == 0;
1401 error (_("Invalid type combination in equality test."));
1402 return 0; /* For lint -- never reached */
1406 /* Simulate the C operator < by returning 1
1407 iff ARG1's contents are less than ARG2's. */
1410 value_less (struct value
*arg1
, struct value
*arg2
)
1412 enum type_code code1
;
1413 enum type_code code2
;
1414 struct type
*type1
, *type2
;
1415 int is_int1
, is_int2
;
1417 arg1
= coerce_array (arg1
);
1418 arg2
= coerce_array (arg2
);
1420 type1
= check_typedef (value_type (arg1
));
1421 type2
= check_typedef (value_type (arg2
));
1422 code1
= TYPE_CODE (type1
);
1423 code2
= TYPE_CODE (type2
);
1424 is_int1
= is_integral_type (type1
);
1425 is_int2
= is_integral_type (type2
);
1427 if (is_int1
&& is_int2
)
1428 return longest_to_int (value_as_long (value_binop (arg1
, arg2
,
1430 else if ((code1
== TYPE_CODE_FLT
|| is_int1
)
1431 && (code2
== TYPE_CODE_FLT
|| is_int2
))
1433 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1434 `long double' values are returned in static storage (m68k). */
1435 DOUBLEST d
= value_as_double (arg1
);
1436 return d
< value_as_double (arg2
);
1438 else if ((code1
== TYPE_CODE_DECFLOAT
|| is_int1
)
1439 && (code2
== TYPE_CODE_DECFLOAT
|| is_int2
))
1441 gdb_byte v1
[16], v2
[16];
1444 value_args_as_decimal (arg1
, arg2
, v1
, &len_v1
, v2
, &len_v2
);
1446 return decimal_compare (v1
, len_v1
, v2
, len_v2
) == -1;
1448 else if (code1
== TYPE_CODE_PTR
&& code2
== TYPE_CODE_PTR
)
1449 return value_as_address (arg1
) < value_as_address (arg2
);
1451 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1453 else if (code1
== TYPE_CODE_PTR
&& is_int2
)
1454 return value_as_address (arg1
) < (CORE_ADDR
) value_as_long (arg2
);
1455 else if (code2
== TYPE_CODE_PTR
&& is_int1
)
1456 return (CORE_ADDR
) value_as_long (arg1
) < value_as_address (arg2
);
1457 else if (code1
== TYPE_CODE_STRING
&& code2
== TYPE_CODE_STRING
)
1458 return value_strcmp (arg1
, arg2
) < 0;
1461 error (_("Invalid type combination in ordering comparison."));
1466 /* The unary operators +, - and ~. They free the argument ARG1. */
1469 value_pos (struct value
*arg1
)
1473 arg1
= coerce_ref (arg1
);
1475 type
= check_typedef (value_type (arg1
));
1477 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1478 return value_from_double (type
, value_as_double (arg1
));
1479 else if (TYPE_CODE (type
) == TYPE_CODE_DECFLOAT
)
1480 return value_from_decfloat (type
, value_contents (arg1
));
1481 else if (is_integral_type (type
))
1483 /* Perform integral promotion for ANSI C/C++. FIXME: What about
1484 FORTRAN and (the deleted) chill ? */
1485 if (TYPE_LENGTH (type
) < TYPE_LENGTH (builtin_type_int
))
1486 type
= builtin_type_int
;
1488 return value_from_longest (type
, value_as_long (arg1
));
1492 error ("Argument to positive operation not a number.");
1493 return 0; /* For lint -- never reached */
1498 value_neg (struct value
*arg1
)
1501 struct type
*result_type
= value_type (arg1
);
1503 arg1
= coerce_ref (arg1
);
1505 type
= check_typedef (value_type (arg1
));
1507 if (TYPE_CODE (type
) == TYPE_CODE_DECFLOAT
)
1509 struct value
*val
= allocate_value (result_type
);
1510 int len
= TYPE_LENGTH (type
);
1511 gdb_byte decbytes
[16]; /* a decfloat is at most 128 bits long */
1513 memcpy (decbytes
, value_contents (arg1
), len
);
1515 if (gdbarch_byte_order (current_gdbarch
) == BFD_ENDIAN_LITTLE
)
1516 decbytes
[len
-1] = decbytes
[len
- 1] | 0x80;
1518 decbytes
[0] = decbytes
[0] | 0x80;
1520 memcpy (value_contents_raw (val
), decbytes
, len
);
1524 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
1525 return value_from_double (result_type
, -value_as_double (arg1
));
1526 else if (is_integral_type (type
))
1528 /* Perform integral promotion for ANSI C/C++. FIXME: What about
1529 FORTRAN and (the deleted) chill ? */
1530 if (TYPE_LENGTH (type
) < TYPE_LENGTH (builtin_type_int
))
1531 result_type
= builtin_type_int
;
1533 return value_from_longest (result_type
, -value_as_long (arg1
));
1537 error (_("Argument to negate operation not a number."));
1538 return 0; /* For lint -- never reached */
1543 value_complement (struct value
*arg1
)
1546 struct type
*result_type
= value_type (arg1
);
1548 arg1
= coerce_ref (arg1
);
1550 type
= check_typedef (value_type (arg1
));
1552 if (!is_integral_type (type
))
1553 error (_("Argument to complement operation not an integer or boolean."));
1555 /* Perform integral promotion for ANSI C/C++.
1556 FIXME: What about FORTRAN ? */
1557 if (TYPE_LENGTH (type
) < TYPE_LENGTH (builtin_type_int
))
1558 result_type
= builtin_type_int
;
1560 return value_from_longest (result_type
, ~value_as_long (arg1
));
1563 /* The INDEX'th bit of SET value whose value_type is TYPE,
1564 and whose value_contents is valaddr.
1565 Return -1 if out of range, -2 other error. */
1568 value_bit_index (struct type
*type
, const gdb_byte
*valaddr
, int index
)
1570 LONGEST low_bound
, high_bound
;
1573 struct type
*range
= TYPE_FIELD_TYPE (type
, 0);
1574 if (get_discrete_bounds (range
, &low_bound
, &high_bound
) < 0)
1576 if (index
< low_bound
|| index
> high_bound
)
1578 rel_index
= index
- low_bound
;
1579 word
= unpack_long (builtin_type_unsigned_char
,
1580 valaddr
+ (rel_index
/ TARGET_CHAR_BIT
));
1581 rel_index
%= TARGET_CHAR_BIT
;
1582 if (gdbarch_bits_big_endian (current_gdbarch
))
1583 rel_index
= TARGET_CHAR_BIT
- 1 - rel_index
;
1584 return (word
>> rel_index
) & 1;
1588 value_in (struct value
*element
, struct value
*set
)
1591 struct type
*settype
= check_typedef (value_type (set
));
1592 struct type
*eltype
= check_typedef (value_type (element
));
1593 if (TYPE_CODE (eltype
) == TYPE_CODE_RANGE
)
1594 eltype
= TYPE_TARGET_TYPE (eltype
);
1595 if (TYPE_CODE (settype
) != TYPE_CODE_SET
)
1596 error (_("Second argument of 'IN' has wrong type"));
1597 if (TYPE_CODE (eltype
) != TYPE_CODE_INT
1598 && TYPE_CODE (eltype
) != TYPE_CODE_CHAR
1599 && TYPE_CODE (eltype
) != TYPE_CODE_ENUM
1600 && TYPE_CODE (eltype
) != TYPE_CODE_BOOL
)
1601 error (_("First argument of 'IN' has wrong type"));
1602 member
= value_bit_index (settype
, value_contents (set
),
1603 value_as_long (element
));
1605 error (_("First argument of 'IN' not in range"));
1606 return value_from_longest (LA_BOOL_TYPE
, member
);
1610 _initialize_valarith (void)