1 /* Perform arithmetic and other operations on values, for GDB.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "expression.h"
32 /* Define whether or not the C operator '/' truncates towards zero for
33 differently signed operands (truncation direction is undefined in C). */
35 #ifndef TRUNCATION_TOWARDS_ZERO
36 #define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2)
39 void _initialize_valarith (void);
42 /* Given a pointer, return the size of its target.
43 If the pointer type is void *, then return 1.
44 If the target type is incomplete, then error out.
45 This isn't a general purpose function, but just a
46 helper for value_ptradd. */
49 find_size_for_pointer_math (struct type *ptr_type)
52 struct type *ptr_target;
54 gdb_assert (TYPE_CODE (ptr_type) == TYPE_CODE_PTR);
55 ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
57 sz = type_length_units (ptr_target);
60 if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
66 name = TYPE_NAME (ptr_target);
68 name = TYPE_TAG_NAME (ptr_target);
70 error (_("Cannot perform pointer math on incomplete types, "
71 "try casting to a known type, or void *."));
73 error (_("Cannot perform pointer math on incomplete type \"%s\", "
74 "try casting to a known type, or void *."), name);
80 /* Given a pointer ARG1 and an integral value ARG2, return the
81 result of C-style pointer arithmetic ARG1 + ARG2. */
84 value_ptradd (struct value *arg1, LONGEST arg2)
86 struct type *valptrtype;
90 arg1 = coerce_array (arg1);
91 valptrtype = check_typedef (value_type (arg1));
92 sz = find_size_for_pointer_math (valptrtype);
94 result = value_from_pointer (valptrtype,
95 value_as_address (arg1) + sz * arg2);
96 if (VALUE_LVAL (result) != lval_internalvar)
97 set_value_component_location (result, arg1);
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))))
120 error (_("First argument of `-' is a pointer and "
121 "second argument is neither\n"
122 "an integer nor a pointer of the same type."));
124 sz = type_length_units (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.
140 See comments in value_coerce_array() for rationale for reason for
141 doing lower bounds adjustment here rather than there.
142 FIXME: Perhaps we should validate that the index is valid and if
143 verbosity is set, warn about invalid indices (but still use them). */
146 value_subscript (struct value *array, LONGEST index)
148 int c_style = current_language->c_style_arrays;
151 array = coerce_ref (array);
152 tarray = check_typedef (value_type (array));
154 if (TYPE_CODE (tarray) == TYPE_CODE_ARRAY
155 || TYPE_CODE (tarray) == TYPE_CODE_STRING)
157 struct type *range_type = TYPE_INDEX_TYPE (tarray);
158 LONGEST lowerbound, upperbound;
160 get_discrete_bounds (range_type, &lowerbound, &upperbound);
161 if (VALUE_LVAL (array) != lval_memory)
162 return value_subscripted_rvalue (array, index, lowerbound);
166 if (index >= lowerbound && index <= upperbound)
167 return value_subscripted_rvalue (array, index, lowerbound);
168 /* Emit warning unless we have an array of unknown size.
169 An array of unknown size has lowerbound 0 and upperbound -1. */
171 warning (_("array or string index out of range"));
172 /* fall doing C stuff */
177 array = value_coerce_array (array);
181 return value_ind (value_ptradd (array, index));
183 error (_("not an array or string"));
186 /* Return the value of EXPR[IDX], expr an aggregate rvalue
187 (eg, a vector register). This routine used to promote floats
188 to doubles, but no longer does. */
191 value_subscripted_rvalue (struct value *array, LONGEST index, int lowerbound)
193 struct type *array_type = check_typedef (value_type (array));
194 struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
195 ULONGEST elt_size = type_length_units (elt_type);
196 ULONGEST elt_offs = elt_size * (index - lowerbound);
198 if (index < lowerbound || (!TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (array_type)
199 && elt_offs >= type_length_units (array_type)))
201 if (type_not_associated (array_type))
202 error (_("no such vector element (vector not associated)"));
203 else if (type_not_allocated (array_type))
204 error (_("no such vector element (vector not allocated)"));
206 error (_("no such vector element"));
209 if (is_dynamic_type (elt_type))
213 address = value_address (array) + elt_offs;
214 elt_type = resolve_dynamic_type (elt_type, NULL, address);
217 return value_from_component (array, elt_type, elt_offs);
221 /* Check to see if either argument is a structure, or a reference to
222 one. This is called so we know whether to go ahead with the normal
223 binop or look for a user defined function instead.
225 For now, we do not overload the `=' operator. */
228 binop_types_user_defined_p (enum exp_opcode op,
229 struct type *type1, struct type *type2)
231 if (op == BINOP_ASSIGN || op == BINOP_CONCAT)
234 type1 = check_typedef (type1);
235 if (TYPE_IS_REFERENCE (type1))
236 type1 = check_typedef (TYPE_TARGET_TYPE (type1));
238 type2 = check_typedef (type2);
239 if (TYPE_IS_REFERENCE (type2))
240 type2 = check_typedef (TYPE_TARGET_TYPE (type2));
242 return (TYPE_CODE (type1) == TYPE_CODE_STRUCT
243 || TYPE_CODE (type2) == TYPE_CODE_STRUCT);
246 /* Check to see if either argument is a structure, or a reference to
247 one. This is called so we know whether to go ahead with the normal
248 binop or look for a user defined function instead.
250 For now, we do not overload the `=' operator. */
253 binop_user_defined_p (enum exp_opcode op,
254 struct value *arg1, struct value *arg2)
256 return binop_types_user_defined_p (op, value_type (arg1), value_type (arg2));
259 /* Check to see if argument is a structure. This is called so
260 we know whether to go ahead with the normal unop or look for a
261 user defined function instead.
263 For now, we do not overload the `&' operator. */
266 unop_user_defined_p (enum exp_opcode op, struct value *arg1)
272 type1 = check_typedef (value_type (arg1));
273 if (TYPE_IS_REFERENCE (type1))
274 type1 = check_typedef (TYPE_TARGET_TYPE (type1));
275 return TYPE_CODE (type1) == TYPE_CODE_STRUCT;
278 /* Try to find an operator named OPERATOR which takes NARGS arguments
279 specified in ARGS. If the operator found is a static member operator
280 *STATIC_MEMFUNP will be set to 1, and otherwise 0.
281 The search if performed through find_overload_match which will handle
282 member operators, non member operators, operators imported implicitly or
283 explicitly, and perform correct overload resolution in all of the above
284 situations or combinations thereof. */
286 static struct value *
287 value_user_defined_cpp_op (struct value **args, int nargs, char *oper,
288 int *static_memfuncp, enum noside noside)
291 struct symbol *symp = NULL;
292 struct value *valp = NULL;
294 find_overload_match (args, nargs, oper, BOTH /* could be method */,
296 NULL /* pass NULL symbol since symbol is unknown */,
297 &valp, &symp, static_memfuncp, 0, noside);
304 /* This is a non member function and does not
305 expect a reference as its first argument
306 rather the explicit structure. */
307 args[0] = value_ind (args[0]);
308 return value_of_variable (symp, 0);
311 error (_("Could not find %s."), oper);
314 /* Lookup user defined operator NAME. Return a value representing the
315 function, otherwise return NULL. */
317 static struct value *
318 value_user_defined_op (struct value **argp, struct value **args, char *name,
319 int *static_memfuncp, int nargs, enum noside noside)
321 struct value *result = NULL;
323 if (current_language->la_language == language_cplus)
325 result = value_user_defined_cpp_op (args, nargs, name, static_memfuncp,
329 result = value_struct_elt (argp, args, name, static_memfuncp,
335 /* We know either arg1 or arg2 is a structure, so try to find the right
336 user defined function. Create an argument vector that calls
337 arg1.operator @ (arg1,arg2) and return that value (where '@' is any
338 binary operator which is legal for GNU C++).
340 OP is the operatore, and if it is BINOP_ASSIGN_MODIFY, then OTHEROP
341 is the opcode saying how to modify it. Otherwise, OTHEROP is
345 value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
346 enum exp_opcode otherop, enum noside noside)
348 struct value **argvec;
353 arg1 = coerce_ref (arg1);
354 arg2 = coerce_ref (arg2);
356 /* now we know that what we have to do is construct our
357 arg vector and find the right function to call it with. */
359 if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
360 error (_("Can't do that binary op on that type")); /* FIXME be explicit */
362 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
363 argvec[1] = value_addr (arg1);
367 /* Make the right function name up. */
368 strcpy (tstr, "operator__");
393 case BINOP_BITWISE_AND:
396 case BINOP_BITWISE_IOR:
399 case BINOP_BITWISE_XOR:
402 case BINOP_LOGICAL_AND:
405 case BINOP_LOGICAL_OR:
417 case BINOP_ASSIGN_MODIFY:
435 case BINOP_BITWISE_AND:
438 case BINOP_BITWISE_IOR:
441 case BINOP_BITWISE_XOR:
444 case BINOP_MOD: /* invalid */
446 error (_("Invalid binary operation specified."));
449 case BINOP_SUBSCRIPT:
470 case BINOP_MOD: /* invalid */
472 error (_("Invalid binary operation specified."));
475 argvec[0] = value_user_defined_op (&arg1, argvec + 1, tstr,
476 &static_memfuncp, 2, noside);
482 argvec[1] = argvec[0];
485 if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_XMETHOD)
487 /* Static xmethods are not supported yet. */
488 gdb_assert (static_memfuncp == 0);
489 if (noside == EVAL_AVOID_SIDE_EFFECTS)
491 struct type *return_type
492 = result_type_of_xmethod (argvec[0], 2, argvec + 1);
494 if (return_type == NULL)
495 error (_("Xmethod is missing return type."));
496 return value_zero (return_type, VALUE_LVAL (arg1));
498 return call_xmethod (argvec[0], 2, argvec + 1);
500 if (noside == EVAL_AVOID_SIDE_EFFECTS)
502 struct type *return_type;
505 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
506 return value_zero (return_type, VALUE_LVAL (arg1));
508 return call_function_by_hand (argvec[0], 2 - static_memfuncp,
511 throw_error (NOT_FOUND_ERROR,
512 _("member function %s not found"), tstr);
514 return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
518 /* We know that arg1 is a structure, so try to find a unary user
519 defined operator that matches the operator in question.
520 Create an argument vector that calls arg1.operator @ (arg1)
521 and return that value (where '@' is (almost) any unary operator which
522 is legal for GNU C++). */
525 value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
527 struct gdbarch *gdbarch = get_type_arch (value_type (arg1));
528 struct value **argvec;
530 char tstr[13], mangle_tstr[13];
531 int static_memfuncp, nargs;
533 arg1 = coerce_ref (arg1);
535 /* now we know that what we have to do is construct our
536 arg vector and find the right function to call it with. */
538 if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
539 error (_("Can't do that unary op on that type")); /* FIXME be explicit */
541 argvec = (struct value **) alloca (sizeof (struct value *) * 4);
542 argvec[1] = value_addr (arg1);
547 /* Make the right function name up. */
548 strcpy (tstr, "operator__");
550 strcpy (mangle_tstr, "__");
553 case UNOP_PREINCREMENT:
556 case UNOP_PREDECREMENT:
559 case UNOP_POSTINCREMENT:
561 argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
565 case UNOP_POSTDECREMENT:
567 argvec[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
571 case UNOP_LOGICAL_NOT:
574 case UNOP_COMPLEMENT:
590 error (_("Invalid unary operation specified."));
593 argvec[0] = value_user_defined_op (&arg1, argvec + 1, tstr,
594 &static_memfuncp, nargs, noside);
600 argvec[1] = argvec[0];
604 if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_XMETHOD)
606 /* Static xmethods are not supported yet. */
607 gdb_assert (static_memfuncp == 0);
608 if (noside == EVAL_AVOID_SIDE_EFFECTS)
610 struct type *return_type
611 = result_type_of_xmethod (argvec[0], 1, argvec + 1);
613 if (return_type == NULL)
614 error (_("Xmethod is missing return type."));
615 return value_zero (return_type, VALUE_LVAL (arg1));
617 return call_xmethod (argvec[0], 1, argvec + 1);
619 if (noside == EVAL_AVOID_SIDE_EFFECTS)
621 struct type *return_type;
624 = TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
625 return value_zero (return_type, VALUE_LVAL (arg1));
627 return call_function_by_hand (argvec[0], nargs, argvec + 1);
629 throw_error (NOT_FOUND_ERROR,
630 _("member function %s not found"), tstr);
632 return 0; /* For lint -- never reached */
636 /* Concatenate two values with the following conditions:
638 (1) Both values must be either bitstring values or character string
639 values and the resulting value consists of the concatenation of
640 ARG1 followed by ARG2.
644 One value must be an integer value and the other value must be
645 either a bitstring value or character string value, which is
646 to be repeated by the number of times specified by the integer
650 (2) Boolean values are also allowed and are treated as bit string
653 (3) Character values are also allowed and are treated as character
654 string values of length 1. */
657 value_concat (struct value *arg1, struct value *arg2)
659 struct value *inval1;
660 struct value *inval2;
661 struct value *outval = NULL;
662 int inval1len, inval2len;
666 struct type *type1 = check_typedef (value_type (arg1));
667 struct type *type2 = check_typedef (value_type (arg2));
668 struct type *char_type;
670 /* First figure out if we are dealing with two values to be concatenated
671 or a repeat count and a value to be repeated. INVAL1 is set to the
672 first of two concatenated values, or the repeat count. INVAL2 is set
673 to the second of the two concatenated values or the value to be
676 if (TYPE_CODE (type2) == TYPE_CODE_INT)
678 struct type *tmp = type1;
691 /* Now process the input values. */
693 if (TYPE_CODE (type1) == TYPE_CODE_INT)
695 /* We have a repeat count. Validate the second value and then
696 construct a value repeated that many times. */
697 if (TYPE_CODE (type2) == TYPE_CODE_STRING
698 || TYPE_CODE (type2) == TYPE_CODE_CHAR)
700 count = longest_to_int (value_as_long (inval1));
701 inval2len = TYPE_LENGTH (type2);
702 std::vector<char> ptr (count * inval2len);
703 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
707 inchar = (char) unpack_long (type2,
708 value_contents (inval2));
709 for (idx = 0; idx < count; idx++)
716 char_type = TYPE_TARGET_TYPE (type2);
718 for (idx = 0; idx < count; idx++)
720 memcpy (&ptr[idx * inval2len], value_contents (inval2),
724 outval = value_string (ptr.data (), count * inval2len, char_type);
726 else if (TYPE_CODE (type2) == TYPE_CODE_BOOL)
728 error (_("unimplemented support for boolean repeats"));
732 error (_("can't repeat values of that type"));
735 else if (TYPE_CODE (type1) == TYPE_CODE_STRING
736 || TYPE_CODE (type1) == TYPE_CODE_CHAR)
738 /* We have two character strings to concatenate. */
739 if (TYPE_CODE (type2) != TYPE_CODE_STRING
740 && TYPE_CODE (type2) != TYPE_CODE_CHAR)
742 error (_("Strings can only be concatenated with other strings."));
744 inval1len = TYPE_LENGTH (type1);
745 inval2len = TYPE_LENGTH (type2);
746 std::vector<char> ptr (inval1len + inval2len);
747 if (TYPE_CODE (type1) == TYPE_CODE_CHAR)
751 ptr[0] = (char) unpack_long (type1, value_contents (inval1));
755 char_type = TYPE_TARGET_TYPE (type1);
757 memcpy (ptr.data (), value_contents (inval1), inval1len);
759 if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
762 (char) unpack_long (type2, value_contents (inval2));
766 memcpy (&ptr[inval1len], value_contents (inval2), inval2len);
768 outval = value_string (ptr.data (), inval1len + inval2len, char_type);
770 else if (TYPE_CODE (type1) == TYPE_CODE_BOOL)
772 /* We have two bitstrings to concatenate. */
773 if (TYPE_CODE (type2) != TYPE_CODE_BOOL)
775 error (_("Booleans can only be concatenated "
776 "with other bitstrings or booleans."));
778 error (_("unimplemented support for boolean concatenation."));
782 /* We don't know how to concatenate these operands. */
783 error (_("illegal operands for concatenation."));
788 /* Integer exponentiation: V1**V2, where both arguments are
789 integers. Requires V1 != 0 if V2 < 0. Returns 1 for 0 ** 0. */
792 integer_pow (LONGEST v1, LONGEST v2)
797 error (_("Attempt to raise 0 to negative power."));
803 /* The Russian Peasant's Algorithm. */
819 /* Integer exponentiation: V1**V2, where both arguments are
820 integers. Requires V1 != 0 if V2 < 0. Returns 1 for 0 ** 0. */
823 uinteger_pow (ULONGEST v1, LONGEST v2)
828 error (_("Attempt to raise 0 to negative power."));
834 /* The Russian Peasant's Algorithm. */
850 /* Obtain decimal value of arguments for binary operation, converting from
851 other types if one of them is not decimal floating point. */
853 value_args_as_decimal (struct value *arg1, struct value *arg2,
854 gdb_byte *x, int *len_x, enum bfd_endian *byte_order_x,
855 gdb_byte *y, int *len_y, enum bfd_endian *byte_order_y)
857 struct type *type1, *type2;
859 type1 = check_typedef (value_type (arg1));
860 type2 = check_typedef (value_type (arg2));
862 /* At least one of the arguments must be of decimal float type. */
863 gdb_assert (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
864 || TYPE_CODE (type2) == TYPE_CODE_DECFLOAT);
866 if (TYPE_CODE (type1) == TYPE_CODE_FLT
867 || TYPE_CODE (type2) == TYPE_CODE_FLT)
868 /* The DFP extension to the C language does not allow mixing of
869 * decimal float types with other float types in expressions
870 * (see WDTR 24732, page 12). */
871 error (_("Mixing decimal floating types with "
872 "other floating types is not allowed."));
874 /* Obtain decimal value of arg1, converting from other types
877 if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
879 *byte_order_x = gdbarch_byte_order (get_type_arch (type1));
880 *len_x = TYPE_LENGTH (type1);
881 memcpy (x, value_contents (arg1), *len_x);
883 else if (is_integral_type (type1))
885 *byte_order_x = gdbarch_byte_order (get_type_arch (type2));
886 *len_x = TYPE_LENGTH (type2);
887 decimal_from_integral (arg1, x, *len_x, *byte_order_x);
890 error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
893 /* Obtain decimal value of arg2, converting from other types
896 if (TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
898 *byte_order_y = gdbarch_byte_order (get_type_arch (type2));
899 *len_y = TYPE_LENGTH (type2);
900 memcpy (y, value_contents (arg2), *len_y);
902 else if (is_integral_type (type2))
904 *byte_order_y = gdbarch_byte_order (get_type_arch (type1));
905 *len_y = TYPE_LENGTH (type1);
906 decimal_from_integral (arg2, y, *len_y, *byte_order_y);
909 error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
913 /* Perform a binary operation on two operands which have reasonable
914 representations as integers or floats. This includes booleans,
915 characters, integers, or floats.
916 Does not support addition and subtraction on pointers;
917 use value_ptradd, value_ptrsub or value_ptrdiff for those operations. */
919 static struct value *
920 scalar_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
923 struct type *type1, *type2, *result_type;
925 arg1 = coerce_ref (arg1);
926 arg2 = coerce_ref (arg2);
928 type1 = check_typedef (value_type (arg1));
929 type2 = check_typedef (value_type (arg2));
931 if ((TYPE_CODE (type1) != TYPE_CODE_FLT
932 && TYPE_CODE (type1) != TYPE_CODE_DECFLOAT
933 && !is_integral_type (type1))
934 || (TYPE_CODE (type2) != TYPE_CODE_FLT
935 && TYPE_CODE (type2) != TYPE_CODE_DECFLOAT
936 && !is_integral_type (type2)))
937 error (_("Argument to arithmetic operation not a number or boolean."));
939 if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
940 || TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
942 int len_v1, len_v2, len_v;
943 enum bfd_endian byte_order_v1, byte_order_v2, byte_order_v;
944 gdb_byte v1[16], v2[16];
947 /* If only one type is decimal float, use its type.
948 Otherwise use the bigger type. */
949 if (TYPE_CODE (type1) != TYPE_CODE_DECFLOAT)
951 else if (TYPE_CODE (type2) != TYPE_CODE_DECFLOAT)
953 else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
958 len_v = TYPE_LENGTH (result_type);
959 byte_order_v = gdbarch_byte_order (get_type_arch (result_type));
961 value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
962 v2, &len_v2, &byte_order_v2);
971 decimal_binop (op, v1, len_v1, byte_order_v1,
972 v2, len_v2, byte_order_v2,
973 v, len_v, byte_order_v);
977 error (_("Operation not valid for decimal floating point number."));
980 val = value_from_decfloat (result_type, v);
982 else if (TYPE_CODE (type1) == TYPE_CODE_FLT
983 || TYPE_CODE (type2) == TYPE_CODE_FLT)
985 /* FIXME-if-picky-about-floating-accuracy: Should be doing this
986 in target format. real.c in GCC probably has the necessary
988 DOUBLEST v1, v2, v = 0;
990 v1 = value_as_double (arg1);
991 v2 = value_as_double (arg2);
1015 error (_("Cannot perform exponentiation: %s"),
1016 safe_strerror (errno));
1020 v = v1 < v2 ? v1 : v2;
1024 v = v1 > v2 ? v1 : v2;
1028 error (_("Integer-only operation on floating point number."));
1031 /* If only one type is float, use its type.
1032 Otherwise use the bigger type. */
1033 if (TYPE_CODE (type1) != TYPE_CODE_FLT)
1034 result_type = type2;
1035 else if (TYPE_CODE (type2) != TYPE_CODE_FLT)
1036 result_type = type1;
1037 else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
1038 result_type = type2;
1040 result_type = type1;
1042 val = allocate_value (result_type);
1043 store_typed_floating (value_contents_raw (val), value_type (val), v);
1045 else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
1046 || TYPE_CODE (type2) == TYPE_CODE_BOOL)
1048 LONGEST v1, v2, v = 0;
1050 v1 = value_as_long (arg1);
1051 v2 = value_as_long (arg2);
1055 case BINOP_BITWISE_AND:
1059 case BINOP_BITWISE_IOR:
1063 case BINOP_BITWISE_XOR:
1071 case BINOP_NOTEQUAL:
1076 error (_("Invalid operation on booleans."));
1079 result_type = type1;
1081 val = allocate_value (result_type);
1082 store_signed_integer (value_contents_raw (val),
1083 TYPE_LENGTH (result_type),
1084 gdbarch_byte_order (get_type_arch (result_type)),
1088 /* Integral operations here. */
1090 /* Determine type length of the result, and if the operation should
1091 be done unsigned. For exponentiation and shift operators,
1092 use the length and type of the left operand. Otherwise,
1093 use the signedness of the operand with the greater length.
1094 If both operands are of equal length, use unsigned operation
1095 if one of the operands is unsigned. */
1096 if (op == BINOP_RSH || op == BINOP_LSH || op == BINOP_EXP)
1097 result_type = type1;
1098 else if (TYPE_LENGTH (type1) > TYPE_LENGTH (type2))
1099 result_type = type1;
1100 else if (TYPE_LENGTH (type2) > TYPE_LENGTH (type1))
1101 result_type = type2;
1102 else if (TYPE_UNSIGNED (type1))
1103 result_type = type1;
1104 else if (TYPE_UNSIGNED (type2))
1105 result_type = type2;
1107 result_type = type1;
1109 if (TYPE_UNSIGNED (result_type))
1111 LONGEST v2_signed = value_as_long (arg2);
1112 ULONGEST v1, v2, v = 0;
1114 v1 = (ULONGEST) value_as_long (arg1);
1115 v2 = (ULONGEST) v2_signed;
1136 error (_("Division by zero"));
1140 v = uinteger_pow (v1, v2_signed);
1147 error (_("Division by zero"));
1151 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1152 v1 mod 0 has a defined value, v1. */
1160 /* Note floor(v1/v2) == v1/v2 for unsigned. */
1173 case BINOP_BITWISE_AND:
1177 case BINOP_BITWISE_IOR:
1181 case BINOP_BITWISE_XOR:
1185 case BINOP_LOGICAL_AND:
1189 case BINOP_LOGICAL_OR:
1194 v = v1 < v2 ? v1 : v2;
1198 v = v1 > v2 ? v1 : v2;
1205 case BINOP_NOTEQUAL:
1226 error (_("Invalid binary operation on numbers."));
1229 val = allocate_value (result_type);
1230 store_unsigned_integer (value_contents_raw (val),
1231 TYPE_LENGTH (value_type (val)),
1233 (get_type_arch (result_type)),
1238 LONGEST v1, v2, v = 0;
1240 v1 = value_as_long (arg1);
1241 v2 = value_as_long (arg2);
1262 error (_("Division by zero"));
1266 v = integer_pow (v1, v2);
1273 error (_("Division by zero"));
1277 /* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
1278 X mod 0 has a defined value, X. */
1286 /* Compute floor. */
1287 if (TRUNCATION_TOWARDS_ZERO && (v < 0) && ((v1 % v2) != 0))
1303 case BINOP_BITWISE_AND:
1307 case BINOP_BITWISE_IOR:
1311 case BINOP_BITWISE_XOR:
1315 case BINOP_LOGICAL_AND:
1319 case BINOP_LOGICAL_OR:
1324 v = v1 < v2 ? v1 : v2;
1328 v = v1 > v2 ? v1 : v2;
1335 case BINOP_NOTEQUAL:
1356 error (_("Invalid binary operation on numbers."));
1359 val = allocate_value (result_type);
1360 store_signed_integer (value_contents_raw (val),
1361 TYPE_LENGTH (value_type (val)),
1363 (get_type_arch (result_type)),
1371 /* Widen a scalar value SCALAR_VALUE to vector type VECTOR_TYPE by
1372 replicating SCALAR_VALUE for each element of the vector. Only scalar
1373 types that can be cast to the type of one element of the vector are
1374 acceptable. The newly created vector value is returned upon success,
1375 otherwise an error is thrown. */
1378 value_vector_widen (struct value *scalar_value, struct type *vector_type)
1380 /* Widen the scalar to a vector. */
1381 struct type *eltype, *scalar_type;
1382 struct value *val, *elval;
1383 LONGEST low_bound, high_bound;
1386 vector_type = check_typedef (vector_type);
1388 gdb_assert (TYPE_CODE (vector_type) == TYPE_CODE_ARRAY
1389 && TYPE_VECTOR (vector_type));
1391 if (!get_array_bounds (vector_type, &low_bound, &high_bound))
1392 error (_("Could not determine the vector bounds"));
1394 eltype = check_typedef (TYPE_TARGET_TYPE (vector_type));
1395 elval = value_cast (eltype, scalar_value);
1397 scalar_type = check_typedef (value_type (scalar_value));
1399 /* If we reduced the length of the scalar then check we didn't loose any
1401 if (TYPE_LENGTH (eltype) < TYPE_LENGTH (scalar_type)
1402 && !value_equal (elval, scalar_value))
1403 error (_("conversion of scalar to vector involves truncation"));
1405 val = allocate_value (vector_type);
1406 for (i = 0; i < high_bound - low_bound + 1; i++)
1407 /* Duplicate the contents of elval into the destination vector. */
1408 memcpy (value_contents_writeable (val) + (i * TYPE_LENGTH (eltype)),
1409 value_contents_all (elval), TYPE_LENGTH (eltype));
1414 /* Performs a binary operation on two vector operands by calling scalar_binop
1415 for each pair of vector components. */
1417 static struct value *
1418 vector_binop (struct value *val1, struct value *val2, enum exp_opcode op)
1420 struct value *val, *tmp, *mark;
1421 struct type *type1, *type2, *eltype1, *eltype2;
1422 int t1_is_vec, t2_is_vec, elsize, i;
1423 LONGEST low_bound1, high_bound1, low_bound2, high_bound2;
1425 type1 = check_typedef (value_type (val1));
1426 type2 = check_typedef (value_type (val2));
1428 t1_is_vec = (TYPE_CODE (type1) == TYPE_CODE_ARRAY
1429 && TYPE_VECTOR (type1)) ? 1 : 0;
1430 t2_is_vec = (TYPE_CODE (type2) == TYPE_CODE_ARRAY
1431 && TYPE_VECTOR (type2)) ? 1 : 0;
1433 if (!t1_is_vec || !t2_is_vec)
1434 error (_("Vector operations are only supported among vectors"));
1436 if (!get_array_bounds (type1, &low_bound1, &high_bound1)
1437 || !get_array_bounds (type2, &low_bound2, &high_bound2))
1438 error (_("Could not determine the vector bounds"));
1440 eltype1 = check_typedef (TYPE_TARGET_TYPE (type1));
1441 eltype2 = check_typedef (TYPE_TARGET_TYPE (type2));
1442 elsize = TYPE_LENGTH (eltype1);
1444 if (TYPE_CODE (eltype1) != TYPE_CODE (eltype2)
1445 || elsize != TYPE_LENGTH (eltype2)
1446 || TYPE_UNSIGNED (eltype1) != TYPE_UNSIGNED (eltype2)
1447 || low_bound1 != low_bound2 || high_bound1 != high_bound2)
1448 error (_("Cannot perform operation on vectors with different types"));
1450 val = allocate_value (type1);
1451 mark = value_mark ();
1452 for (i = 0; i < high_bound1 - low_bound1 + 1; i++)
1454 tmp = value_binop (value_subscript (val1, i),
1455 value_subscript (val2, i), op);
1456 memcpy (value_contents_writeable (val) + i * elsize,
1457 value_contents_all (tmp),
1460 value_free_to_mark (mark);
1465 /* Perform a binary operation on two operands. */
1468 value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
1471 struct type *type1 = check_typedef (value_type (arg1));
1472 struct type *type2 = check_typedef (value_type (arg2));
1473 int t1_is_vec = (TYPE_CODE (type1) == TYPE_CODE_ARRAY
1474 && TYPE_VECTOR (type1));
1475 int t2_is_vec = (TYPE_CODE (type2) == TYPE_CODE_ARRAY
1476 && TYPE_VECTOR (type2));
1478 if (!t1_is_vec && !t2_is_vec)
1479 val = scalar_binop (arg1, arg2, op);
1480 else if (t1_is_vec && t2_is_vec)
1481 val = vector_binop (arg1, arg2, op);
1484 /* Widen the scalar operand to a vector. */
1485 struct value **v = t1_is_vec ? &arg2 : &arg1;
1486 struct type *t = t1_is_vec ? type2 : type1;
1488 if (TYPE_CODE (t) != TYPE_CODE_FLT
1489 && TYPE_CODE (t) != TYPE_CODE_DECFLOAT
1490 && !is_integral_type (t))
1491 error (_("Argument to operation not a number or boolean."));
1493 /* Replicate the scalar value to make a vector value. */
1494 *v = value_vector_widen (*v, t1_is_vec ? type1 : type2);
1496 val = vector_binop (arg1, arg2, op);
1502 /* Simulate the C operator ! -- return 1 if ARG1 contains zero. */
1505 value_logical_not (struct value *arg1)
1511 arg1 = coerce_array (arg1);
1512 type1 = check_typedef (value_type (arg1));
1514 if (TYPE_CODE (type1) == TYPE_CODE_FLT)
1515 return 0 == value_as_double (arg1);
1516 else if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
1517 return decimal_is_zero (value_contents (arg1), TYPE_LENGTH (type1),
1518 gdbarch_byte_order (get_type_arch (type1)));
1520 len = TYPE_LENGTH (type1);
1521 p = value_contents (arg1);
1532 /* Perform a comparison on two string values (whose content are not
1533 necessarily null terminated) based on their length. */
1536 value_strcmp (struct value *arg1, struct value *arg2)
1538 int len1 = TYPE_LENGTH (value_type (arg1));
1539 int len2 = TYPE_LENGTH (value_type (arg2));
1540 const gdb_byte *s1 = value_contents (arg1);
1541 const gdb_byte *s2 = value_contents (arg2);
1542 int i, len = len1 < len2 ? len1 : len2;
1544 for (i = 0; i < len; i++)
1548 else if (s1[i] > s2[i])
1556 else if (len1 > len2)
1562 /* Simulate the C operator == by returning a 1
1563 iff ARG1 and ARG2 have equal contents. */
1566 value_equal (struct value *arg1, struct value *arg2)
1571 struct type *type1, *type2;
1572 enum type_code code1;
1573 enum type_code code2;
1574 int is_int1, is_int2;
1576 arg1 = coerce_array (arg1);
1577 arg2 = coerce_array (arg2);
1579 type1 = check_typedef (value_type (arg1));
1580 type2 = check_typedef (value_type (arg2));
1581 code1 = TYPE_CODE (type1);
1582 code2 = TYPE_CODE (type2);
1583 is_int1 = is_integral_type (type1);
1584 is_int2 = is_integral_type (type2);
1586 if (is_int1 && is_int2)
1587 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1589 else if ((code1 == TYPE_CODE_FLT || is_int1)
1590 && (code2 == TYPE_CODE_FLT || is_int2))
1592 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1593 `long double' values are returned in static storage (m68k). */
1594 DOUBLEST d = value_as_double (arg1);
1596 return d == value_as_double (arg2);
1598 else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
1599 && (code2 == TYPE_CODE_DECFLOAT || is_int2))
1601 gdb_byte v1[16], v2[16];
1603 enum bfd_endian byte_order_v1, byte_order_v2;
1605 value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
1606 v2, &len_v2, &byte_order_v2);
1608 return decimal_compare (v1, len_v1, byte_order_v1,
1609 v2, len_v2, byte_order_v2) == 0;
1612 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1614 else if (code1 == TYPE_CODE_PTR && is_int2)
1615 return value_as_address (arg1) == (CORE_ADDR) value_as_long (arg2);
1616 else if (code2 == TYPE_CODE_PTR && is_int1)
1617 return (CORE_ADDR) value_as_long (arg1) == value_as_address (arg2);
1619 else if (code1 == code2
1620 && ((len = (int) TYPE_LENGTH (type1))
1621 == (int) TYPE_LENGTH (type2)))
1623 p1 = value_contents (arg1);
1624 p2 = value_contents (arg2);
1632 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1634 return value_strcmp (arg1, arg2) == 0;
1638 error (_("Invalid type combination in equality test."));
1639 return 0; /* For lint -- never reached. */
1643 /* Compare values based on their raw contents. Useful for arrays since
1644 value_equal coerces them to pointers, thus comparing just the address
1645 of the array instead of its contents. */
1648 value_equal_contents (struct value *arg1, struct value *arg2)
1650 struct type *type1, *type2;
1652 type1 = check_typedef (value_type (arg1));
1653 type2 = check_typedef (value_type (arg2));
1655 return (TYPE_CODE (type1) == TYPE_CODE (type2)
1656 && TYPE_LENGTH (type1) == TYPE_LENGTH (type2)
1657 && memcmp (value_contents (arg1), value_contents (arg2),
1658 TYPE_LENGTH (type1)) == 0);
1661 /* Simulate the C operator < by returning 1
1662 iff ARG1's contents are less than ARG2's. */
1665 value_less (struct value *arg1, struct value *arg2)
1667 enum type_code code1;
1668 enum type_code code2;
1669 struct type *type1, *type2;
1670 int is_int1, is_int2;
1672 arg1 = coerce_array (arg1);
1673 arg2 = coerce_array (arg2);
1675 type1 = check_typedef (value_type (arg1));
1676 type2 = check_typedef (value_type (arg2));
1677 code1 = TYPE_CODE (type1);
1678 code2 = TYPE_CODE (type2);
1679 is_int1 = is_integral_type (type1);
1680 is_int2 = is_integral_type (type2);
1682 if (is_int1 && is_int2)
1683 return longest_to_int (value_as_long (value_binop (arg1, arg2,
1685 else if ((code1 == TYPE_CODE_FLT || is_int1)
1686 && (code2 == TYPE_CODE_FLT || is_int2))
1688 /* NOTE: kettenis/20050816: Avoid compiler bug on systems where
1689 `long double' values are returned in static storage (m68k). */
1690 DOUBLEST d = value_as_double (arg1);
1692 return d < value_as_double (arg2);
1694 else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
1695 && (code2 == TYPE_CODE_DECFLOAT || is_int2))
1697 gdb_byte v1[16], v2[16];
1699 enum bfd_endian byte_order_v1, byte_order_v2;
1701 value_args_as_decimal (arg1, arg2, v1, &len_v1, &byte_order_v1,
1702 v2, &len_v2, &byte_order_v2);
1704 return decimal_compare (v1, len_v1, byte_order_v1,
1705 v2, len_v2, byte_order_v2) == -1;
1707 else if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
1708 return value_as_address (arg1) < value_as_address (arg2);
1710 /* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
1712 else if (code1 == TYPE_CODE_PTR && is_int2)
1713 return value_as_address (arg1) < (CORE_ADDR) value_as_long (arg2);
1714 else if (code2 == TYPE_CODE_PTR && is_int1)
1715 return (CORE_ADDR) value_as_long (arg1) < value_as_address (arg2);
1716 else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
1717 return value_strcmp (arg1, arg2) < 0;
1720 error (_("Invalid type combination in ordering comparison."));
1725 /* The unary operators +, - and ~. They free the argument ARG1. */
1728 value_pos (struct value *arg1)
1732 arg1 = coerce_ref (arg1);
1733 type = check_typedef (value_type (arg1));
1735 if (TYPE_CODE (type) == TYPE_CODE_FLT)
1736 return value_from_double (type, value_as_double (arg1));
1737 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
1738 return value_from_decfloat (type, value_contents (arg1));
1739 else if (is_integral_type (type))
1741 return value_from_longest (type, value_as_long (arg1));
1743 else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
1745 struct value *val = allocate_value (type);
1747 memcpy (value_contents_raw (val), value_contents (arg1),
1748 TYPE_LENGTH (type));
1753 error (_("Argument to positive operation not a number."));
1754 return 0; /* For lint -- never reached. */
1759 value_neg (struct value *arg1)
1763 arg1 = coerce_ref (arg1);
1764 type = check_typedef (value_type (arg1));
1766 if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
1768 struct value *val = allocate_value (type);
1769 int len = TYPE_LENGTH (type);
1770 gdb_byte decbytes[16]; /* a decfloat is at most 128 bits long. */
1772 memcpy (decbytes, value_contents (arg1), len);
1774 if (gdbarch_byte_order (get_type_arch (type)) == BFD_ENDIAN_LITTLE)
1775 decbytes[len-1] = decbytes[len - 1] | 0x80;
1777 decbytes[0] = decbytes[0] | 0x80;
1779 memcpy (value_contents_raw (val), decbytes, len);
1782 else if (TYPE_CODE (type) == TYPE_CODE_FLT)
1783 return value_from_double (type, -value_as_double (arg1));
1784 else if (is_integral_type (type))
1786 return value_from_longest (type, -value_as_long (arg1));
1788 else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
1790 struct value *tmp, *val = allocate_value (type);
1791 struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type));
1793 LONGEST low_bound, high_bound;
1795 if (!get_array_bounds (type, &low_bound, &high_bound))
1796 error (_("Could not determine the vector bounds"));
1798 for (i = 0; i < high_bound - low_bound + 1; i++)
1800 tmp = value_neg (value_subscript (arg1, i));
1801 memcpy (value_contents_writeable (val) + i * TYPE_LENGTH (eltype),
1802 value_contents_all (tmp), TYPE_LENGTH (eltype));
1808 error (_("Argument to negate operation not a number."));
1809 return 0; /* For lint -- never reached. */
1814 value_complement (struct value *arg1)
1819 arg1 = coerce_ref (arg1);
1820 type = check_typedef (value_type (arg1));
1822 if (is_integral_type (type))
1823 val = value_from_longest (type, ~value_as_long (arg1));
1824 else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
1827 struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type));
1829 LONGEST low_bound, high_bound;
1831 if (!get_array_bounds (type, &low_bound, &high_bound))
1832 error (_("Could not determine the vector bounds"));
1834 val = allocate_value (type);
1835 for (i = 0; i < high_bound - low_bound + 1; i++)
1837 tmp = value_complement (value_subscript (arg1, i));
1838 memcpy (value_contents_writeable (val) + i * TYPE_LENGTH (eltype),
1839 value_contents_all (tmp), TYPE_LENGTH (eltype));
1843 error (_("Argument to complement operation not an integer, boolean."));
1848 /* The INDEX'th bit of SET value whose value_type is TYPE,
1849 and whose value_contents is valaddr.
1850 Return -1 if out of range, -2 other error. */
1853 value_bit_index (struct type *type, const gdb_byte *valaddr, int index)
1855 struct gdbarch *gdbarch = get_type_arch (type);
1856 LONGEST low_bound, high_bound;
1859 struct type *range = TYPE_INDEX_TYPE (type);
1861 if (get_discrete_bounds (range, &low_bound, &high_bound) < 0)
1863 if (index < low_bound || index > high_bound)
1865 rel_index = index - low_bound;
1866 word = extract_unsigned_integer (valaddr + (rel_index / TARGET_CHAR_BIT), 1,
1867 gdbarch_byte_order (gdbarch));
1868 rel_index %= TARGET_CHAR_BIT;
1869 if (gdbarch_bits_big_endian (gdbarch))
1870 rel_index = TARGET_CHAR_BIT - 1 - rel_index;
1871 return (word >> rel_index) & 1;
1875 value_in (struct value *element, struct value *set)
1878 struct type *settype = check_typedef (value_type (set));
1879 struct type *eltype = check_typedef (value_type (element));
1881 if (TYPE_CODE (eltype) == TYPE_CODE_RANGE)
1882 eltype = TYPE_TARGET_TYPE (eltype);
1883 if (TYPE_CODE (settype) != TYPE_CODE_SET)
1884 error (_("Second argument of 'IN' has wrong type"));
1885 if (TYPE_CODE (eltype) != TYPE_CODE_INT
1886 && TYPE_CODE (eltype) != TYPE_CODE_CHAR
1887 && TYPE_CODE (eltype) != TYPE_CODE_ENUM
1888 && TYPE_CODE (eltype) != TYPE_CODE_BOOL)
1889 error (_("First argument of 'IN' has wrong type"));
1890 member = value_bit_index (settype, value_contents (set),
1891 value_as_long (element));
1893 error (_("First argument of 'IN' not in range"));
1898 _initialize_valarith (void)