1 /* Evaluate expressions for GDB.
3 Copyright (C) 1986-2016 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"
27 #include "gdbthread.h"
28 #include "language.h" /* For CAST_IS_CONVERSION. */
29 #include "f-lang.h" /* For array bound stuff. */
32 #include "objc-lang.h"
34 #include "parser-defs.h"
35 #include "cp-support.h"
38 #include "user-regs.h"
40 #include "gdb_obstack.h"
44 /* This is defined in valops.c */
45 extern int overload_resolution;
47 /* Prototypes for local functions. */
49 static struct value *evaluate_subexp_for_sizeof (struct expression *, int *,
52 static struct value *evaluate_subexp_for_address (struct expression *,
55 static struct value *evaluate_struct_tuple (struct value *,
56 struct expression *, int *,
59 static LONGEST init_array_element (struct value *, struct value *,
60 struct expression *, int *, enum noside,
64 evaluate_subexp (struct type *expect_type, struct expression *exp,
65 int *pos, enum noside noside)
67 struct cleanup *cleanups;
69 int cleanup_temps = 0;
71 if (*pos == 0 && target_has_execution
72 && exp->language_defn->la_language == language_cplus
73 && !thread_stack_temporaries_enabled_p (inferior_ptid))
75 cleanups = enable_thread_stack_temporaries (inferior_ptid);
79 retval = (*exp->language_defn->la_exp_desc->evaluate_exp)
80 (expect_type, exp, pos, noside);
84 if (value_in_thread_stack_temporaries (retval, inferior_ptid))
85 retval = value_non_lval (retval);
86 do_cleanups (cleanups);
92 /* Parse the string EXP as a C expression, evaluate it,
93 and return the result as a number. */
96 parse_and_eval_address (const char *exp)
98 struct expression *expr = parse_expression (exp);
100 struct cleanup *old_chain =
101 make_cleanup (free_current_contents, &expr);
103 addr = value_as_address (evaluate_expression (expr));
104 do_cleanups (old_chain);
108 /* Like parse_and_eval_address, but treats the value of the expression
109 as an integer, not an address, returns a LONGEST, not a CORE_ADDR. */
111 parse_and_eval_long (const char *exp)
113 struct expression *expr = parse_expression (exp);
115 struct cleanup *old_chain =
116 make_cleanup (free_current_contents, &expr);
118 retval = value_as_long (evaluate_expression (expr));
119 do_cleanups (old_chain);
124 parse_and_eval (const char *exp)
126 struct expression *expr = parse_expression (exp);
128 struct cleanup *old_chain =
129 make_cleanup (free_current_contents, &expr);
131 val = evaluate_expression (expr);
132 do_cleanups (old_chain);
136 /* Parse up to a comma (or to a closeparen)
137 in the string EXPP as an expression, evaluate it, and return the value.
138 EXPP is advanced to point to the comma. */
141 parse_to_comma_and_eval (const char **expp)
143 struct expression *expr = parse_exp_1 (expp, 0, (struct block *) 0, 1);
145 struct cleanup *old_chain =
146 make_cleanup (free_current_contents, &expr);
148 val = evaluate_expression (expr);
149 do_cleanups (old_chain);
153 /* Evaluate an expression in internal prefix form
154 such as is constructed by parse.y.
156 See expression.h for info on the format of an expression. */
159 evaluate_expression (struct expression *exp)
163 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL);
166 /* Evaluate an expression, avoiding all memory references
167 and getting a value whose type alone is correct. */
170 evaluate_type (struct expression *exp)
174 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
177 /* Evaluate a subexpression, avoiding all memory references and
178 getting a value whose type alone is correct. */
181 evaluate_subexpression_type (struct expression *exp, int subexp)
183 return evaluate_subexp (NULL_TYPE, exp, &subexp, EVAL_AVOID_SIDE_EFFECTS);
186 /* Find the current value of a watchpoint on EXP. Return the value in
187 *VALP and *RESULTP and the chain of intermediate and final values
188 in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does
191 If PRESERVE_ERRORS is true, then exceptions are passed through.
192 Otherwise, if PRESERVE_ERRORS is false, then if a memory error
193 occurs while evaluating the expression, *RESULTP will be set to
194 NULL. *RESULTP may be a lazy value, if the result could not be
195 read from memory. It is used to determine whether a value is
196 user-specified (we should watch the whole value) or intermediate
197 (we should watch only the bit used to locate the final value).
199 If the final value, or any intermediate value, could not be read
200 from memory, *VALP will be set to NULL. *VAL_CHAIN will still be
201 set to any referenced values. *VALP will never be a lazy value.
202 This is the value which we store in struct breakpoint.
204 If VAL_CHAIN is non-NULL, *VAL_CHAIN will be released from the
205 value chain. The caller must free the values individually. If
206 VAL_CHAIN is NULL, all generated values will be left on the value
210 fetch_subexp_value (struct expression *exp, int *pc, struct value **valp,
211 struct value **resultp, struct value **val_chain,
214 struct value *mark, *new_mark, *result;
222 /* Evaluate the expression. */
223 mark = value_mark ();
228 result = evaluate_subexp (NULL_TYPE, exp, pc, EVAL_NORMAL);
230 CATCH (ex, RETURN_MASK_ALL)
232 /* Ignore memory errors if we want watchpoints pointing at
233 inaccessible memory to still be created; otherwise, throw the
234 error to some higher catcher. */
238 if (!preserve_errors)
241 throw_exception (ex);
247 new_mark = value_mark ();
248 if (mark == new_mark)
253 /* Make sure it's not lazy, so that after the target stops again we
254 have a non-lazy previous value to compare with. */
257 if (!value_lazy (result))
264 value_fetch_lazy (result);
267 CATCH (except, RETURN_MASK_ERROR)
276 /* Return the chain of intermediate values. We use this to
277 decide which addresses to watch. */
278 *val_chain = new_mark;
279 value_release_to_mark (mark);
283 /* Extract a field operation from an expression. If the subexpression
284 of EXP starting at *SUBEXP is not a structure dereference
285 operation, return NULL. Otherwise, return the name of the
286 dereferenced field, and advance *SUBEXP to point to the
287 subexpression of the left-hand-side of the dereference. This is
288 used when completing field names. */
291 extract_field_op (struct expression *exp, int *subexp)
296 if (exp->elts[*subexp].opcode != STRUCTOP_STRUCT
297 && exp->elts[*subexp].opcode != STRUCTOP_PTR)
299 tem = longest_to_int (exp->elts[*subexp + 1].longconst);
300 result = &exp->elts[*subexp + 2].string;
301 (*subexp) += 1 + 3 + BYTES_TO_EXP_ELEM (tem + 1);
305 /* This function evaluates brace-initializers (in C/C++) for
308 static struct value *
309 evaluate_struct_tuple (struct value *struct_val,
310 struct expression *exp,
311 int *pos, enum noside noside, int nargs)
313 struct type *struct_type = check_typedef (value_type (struct_val));
314 struct type *field_type;
319 struct value *val = NULL;
324 /* Skip static fields. */
325 while (fieldno < TYPE_NFIELDS (struct_type)
326 && field_is_static (&TYPE_FIELD (struct_type,
329 if (fieldno >= TYPE_NFIELDS (struct_type))
330 error (_("too many initializers"));
331 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
332 if (TYPE_CODE (field_type) == TYPE_CODE_UNION
333 && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0')
334 error (_("don't know which variant you want to set"));
336 /* Here, struct_type is the type of the inner struct,
337 while substruct_type is the type of the inner struct.
338 These are the same for normal structures, but a variant struct
339 contains anonymous union fields that contain substruct fields.
340 The value fieldno is the index of the top-level (normal or
341 anonymous union) field in struct_field, while the value
342 subfieldno is the index of the actual real (named inner) field
343 in substruct_type. */
345 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
347 val = evaluate_subexp (field_type, exp, pos, noside);
349 /* Now actually set the field in struct_val. */
351 /* Assign val to field fieldno. */
352 if (value_type (val) != field_type)
353 val = value_cast (field_type, val);
355 bitsize = TYPE_FIELD_BITSIZE (struct_type, fieldno);
356 bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno);
357 addr = value_contents_writeable (struct_val) + bitpos / 8;
359 modify_field (struct_type, addr,
360 value_as_long (val), bitpos % 8, bitsize);
362 memcpy (addr, value_contents (val),
363 TYPE_LENGTH (value_type (val)));
369 /* Recursive helper function for setting elements of array tuples.
370 The target is ARRAY (which has bounds LOW_BOUND to HIGH_BOUND); the
371 element value is ELEMENT; EXP, POS and NOSIDE are as usual.
372 Evaluates index expresions and sets the specified element(s) of
373 ARRAY to ELEMENT. Returns last index value. */
376 init_array_element (struct value *array, struct value *element,
377 struct expression *exp, int *pos,
378 enum noside noside, LONGEST low_bound, LONGEST high_bound)
381 int element_size = TYPE_LENGTH (value_type (element));
383 if (exp->elts[*pos].opcode == BINOP_COMMA)
386 init_array_element (array, element, exp, pos, noside,
387 low_bound, high_bound);
388 return init_array_element (array, element,
389 exp, pos, noside, low_bound, high_bound);
393 index = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
394 if (index < low_bound || index > high_bound)
395 error (_("tuple index out of range"));
396 memcpy (value_contents_raw (array) + (index - low_bound) * element_size,
397 value_contents (element), element_size);
402 static struct value *
403 value_f90_subarray (struct value *array,
404 struct expression *exp, int *pos, enum noside noside)
407 LONGEST low_bound, high_bound;
408 struct type *range = check_typedef (TYPE_INDEX_TYPE (value_type (array)));
409 enum f90_range_type range_type
410 = (enum f90_range_type) longest_to_int (exp->elts[pc].longconst);
414 if (range_type == LOW_BOUND_DEFAULT || range_type == BOTH_BOUND_DEFAULT)
415 low_bound = TYPE_LOW_BOUND (range);
417 low_bound = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
419 if (range_type == HIGH_BOUND_DEFAULT || range_type == BOTH_BOUND_DEFAULT)
420 high_bound = TYPE_HIGH_BOUND (range);
422 high_bound = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
424 return value_slice (array, low_bound, high_bound - low_bound + 1);
428 /* Promote value ARG1 as appropriate before performing a unary operation
430 If the result is not appropriate for any particular language then it
431 needs to patch this function. */
434 unop_promote (const struct language_defn *language, struct gdbarch *gdbarch,
439 *arg1 = coerce_ref (*arg1);
440 type1 = check_typedef (value_type (*arg1));
442 if (is_integral_type (type1))
444 switch (language->la_language)
447 /* Perform integral promotion for ANSI C/C++.
448 If not appropropriate for any particular language
449 it needs to modify this function. */
451 struct type *builtin_int = builtin_type (gdbarch)->builtin_int;
453 if (TYPE_LENGTH (type1) < TYPE_LENGTH (builtin_int))
454 *arg1 = value_cast (builtin_int, *arg1);
461 /* Promote values ARG1 and ARG2 as appropriate before performing a binary
462 operation on those two operands.
463 If the result is not appropriate for any particular language then it
464 needs to patch this function. */
467 binop_promote (const struct language_defn *language, struct gdbarch *gdbarch,
468 struct value **arg1, struct value **arg2)
470 struct type *promoted_type = NULL;
474 *arg1 = coerce_ref (*arg1);
475 *arg2 = coerce_ref (*arg2);
477 type1 = check_typedef (value_type (*arg1));
478 type2 = check_typedef (value_type (*arg2));
480 if ((TYPE_CODE (type1) != TYPE_CODE_FLT
481 && TYPE_CODE (type1) != TYPE_CODE_DECFLOAT
482 && !is_integral_type (type1))
483 || (TYPE_CODE (type2) != TYPE_CODE_FLT
484 && TYPE_CODE (type2) != TYPE_CODE_DECFLOAT
485 && !is_integral_type (type2)))
488 if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
489 || TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
491 /* No promotion required. */
493 else if (TYPE_CODE (type1) == TYPE_CODE_FLT
494 || TYPE_CODE (type2) == TYPE_CODE_FLT)
496 switch (language->la_language)
502 case language_opencl:
503 /* No promotion required. */
507 /* For other languages the result type is unchanged from gdb
508 version 6.7 for backward compatibility.
509 If either arg was long double, make sure that value is also long
510 double. Otherwise use double. */
511 if (TYPE_LENGTH (type1) * 8 > gdbarch_double_bit (gdbarch)
512 || TYPE_LENGTH (type2) * 8 > gdbarch_double_bit (gdbarch))
513 promoted_type = builtin_type (gdbarch)->builtin_long_double;
515 promoted_type = builtin_type (gdbarch)->builtin_double;
519 else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
520 && TYPE_CODE (type2) == TYPE_CODE_BOOL)
522 /* No promotion required. */
525 /* Integral operations here. */
526 /* FIXME: Also mixed integral/booleans, with result an integer. */
528 const struct builtin_type *builtin = builtin_type (gdbarch);
529 unsigned int promoted_len1 = TYPE_LENGTH (type1);
530 unsigned int promoted_len2 = TYPE_LENGTH (type2);
531 int is_unsigned1 = TYPE_UNSIGNED (type1);
532 int is_unsigned2 = TYPE_UNSIGNED (type2);
533 unsigned int result_len;
534 int unsigned_operation;
536 /* Determine type length and signedness after promotion for
538 if (promoted_len1 < TYPE_LENGTH (builtin->builtin_int))
541 promoted_len1 = TYPE_LENGTH (builtin->builtin_int);
543 if (promoted_len2 < TYPE_LENGTH (builtin->builtin_int))
546 promoted_len2 = TYPE_LENGTH (builtin->builtin_int);
549 if (promoted_len1 > promoted_len2)
551 unsigned_operation = is_unsigned1;
552 result_len = promoted_len1;
554 else if (promoted_len2 > promoted_len1)
556 unsigned_operation = is_unsigned2;
557 result_len = promoted_len2;
561 unsigned_operation = is_unsigned1 || is_unsigned2;
562 result_len = promoted_len1;
565 switch (language->la_language)
571 if (result_len <= TYPE_LENGTH (builtin->builtin_int))
573 promoted_type = (unsigned_operation
574 ? builtin->builtin_unsigned_int
575 : builtin->builtin_int);
577 else if (result_len <= TYPE_LENGTH (builtin->builtin_long))
579 promoted_type = (unsigned_operation
580 ? builtin->builtin_unsigned_long
581 : builtin->builtin_long);
585 promoted_type = (unsigned_operation
586 ? builtin->builtin_unsigned_long_long
587 : builtin->builtin_long_long);
590 case language_opencl:
591 if (result_len <= TYPE_LENGTH (lookup_signed_typename
592 (language, gdbarch, "int")))
596 ? lookup_unsigned_typename (language, gdbarch, "int")
597 : lookup_signed_typename (language, gdbarch, "int"));
599 else if (result_len <= TYPE_LENGTH (lookup_signed_typename
600 (language, gdbarch, "long")))
604 ? lookup_unsigned_typename (language, gdbarch, "long")
605 : lookup_signed_typename (language, gdbarch,"long"));
609 /* For other languages the result type is unchanged from gdb
610 version 6.7 for backward compatibility.
611 If either arg was long long, make sure that value is also long
612 long. Otherwise use long. */
613 if (unsigned_operation)
615 if (result_len > gdbarch_long_bit (gdbarch) / HOST_CHAR_BIT)
616 promoted_type = builtin->builtin_unsigned_long_long;
618 promoted_type = builtin->builtin_unsigned_long;
622 if (result_len > gdbarch_long_bit (gdbarch) / HOST_CHAR_BIT)
623 promoted_type = builtin->builtin_long_long;
625 promoted_type = builtin->builtin_long;
633 /* Promote both operands to common type. */
634 *arg1 = value_cast (promoted_type, *arg1);
635 *arg2 = value_cast (promoted_type, *arg2);
640 ptrmath_type_p (const struct language_defn *lang, struct type *type)
642 type = check_typedef (type);
643 if (TYPE_CODE (type) == TYPE_CODE_REF)
644 type = TYPE_TARGET_TYPE (type);
646 switch (TYPE_CODE (type))
652 case TYPE_CODE_ARRAY:
653 return TYPE_VECTOR (type) ? 0 : lang->c_style_arrays;
660 /* Constructs a fake method with the given parameter types.
661 This function is used by the parser to construct an "expected"
662 type for method overload resolution. */
665 make_params (int num_types, struct type **param_types)
667 struct type *type = XCNEW (struct type);
668 TYPE_MAIN_TYPE (type) = XCNEW (struct main_type);
669 TYPE_LENGTH (type) = 1;
670 TYPE_CODE (type) = TYPE_CODE_METHOD;
671 TYPE_CHAIN (type) = type;
674 if (param_types[num_types - 1] == NULL)
677 TYPE_VARARGS (type) = 1;
679 else if (TYPE_CODE (check_typedef (param_types[num_types - 1]))
683 /* Caller should have ensured this. */
684 gdb_assert (num_types == 0);
685 TYPE_PROTOTYPED (type) = 1;
689 TYPE_NFIELDS (type) = num_types;
690 TYPE_FIELDS (type) = (struct field *)
691 TYPE_ZALLOC (type, sizeof (struct field) * num_types);
693 while (num_types-- > 0)
694 TYPE_FIELD_TYPE (type, num_types) = param_types[num_types];
700 evaluate_subexp_standard (struct type *expect_type,
701 struct expression *exp, int *pos,
706 int pc, pc2 = 0, oldpos;
707 struct value *arg1 = NULL;
708 struct value *arg2 = NULL;
712 struct value **argvec;
716 struct type **arg_types;
718 struct symbol *function = NULL;
719 char *function_name = NULL;
722 op = exp->elts[pc].opcode;
727 tem = longest_to_int (exp->elts[pc + 2].longconst);
728 (*pos) += 4 + BYTES_TO_EXP_ELEM (tem + 1);
729 if (noside == EVAL_SKIP)
731 arg1 = value_aggregate_elt (exp->elts[pc + 1].type,
732 &exp->elts[pc + 3].string,
733 expect_type, 0, noside);
735 error (_("There is no field named %s"), &exp->elts[pc + 3].string);
740 return value_from_longest (exp->elts[pc + 1].type,
741 exp->elts[pc + 2].longconst);
745 return value_from_double (exp->elts[pc + 1].type,
746 exp->elts[pc + 2].doubleconst);
750 return value_from_decfloat (exp->elts[pc + 1].type,
751 exp->elts[pc + 2].decfloatconst);
756 if (noside == EVAL_SKIP)
759 /* JYG: We used to just return value_zero of the symbol type
760 if we're asked to avoid side effects. Otherwise we return
761 value_of_variable (...). However I'm not sure if
762 value_of_variable () has any side effect.
763 We need a full value object returned here for whatis_exp ()
764 to call evaluate_type () and then pass the full value to
765 value_rtti_target_type () if we are dealing with a pointer
766 or reference to a base class and print object is on. */
769 struct value *ret = NULL;
773 ret = value_of_variable (exp->elts[pc + 2].symbol,
774 exp->elts[pc + 1].block);
777 CATCH (except, RETURN_MASK_ERROR)
779 if (noside == EVAL_AVOID_SIDE_EFFECTS)
780 ret = value_zero (SYMBOL_TYPE (exp->elts[pc + 2].symbol),
783 throw_exception (except);
790 case OP_VAR_ENTRY_VALUE:
792 if (noside == EVAL_SKIP)
796 struct symbol *sym = exp->elts[pc + 1].symbol;
797 struct frame_info *frame;
799 if (noside == EVAL_AVOID_SIDE_EFFECTS)
800 return value_zero (SYMBOL_TYPE (sym), not_lval);
802 if (SYMBOL_COMPUTED_OPS (sym) == NULL
803 || SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry == NULL)
804 error (_("Symbol \"%s\" does not have any specific entry value"),
805 SYMBOL_PRINT_NAME (sym));
807 frame = get_selected_frame (NULL);
808 return SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry (sym, frame);
814 access_value_history (longest_to_int (exp->elts[pc + 1].longconst));
818 const char *name = &exp->elts[pc + 2].string;
822 (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
823 regno = user_reg_map_name_to_regnum (exp->gdbarch,
824 name, strlen (name));
826 error (_("Register $%s not available."), name);
828 /* In EVAL_AVOID_SIDE_EFFECTS mode, we only need to return
829 a value with the appropriate register type. Unfortunately,
830 we don't have easy access to the type of user registers.
831 So for these registers, we fetch the register value regardless
832 of the evaluation mode. */
833 if (noside == EVAL_AVOID_SIDE_EFFECTS
834 && regno < gdbarch_num_regs (exp->gdbarch)
835 + gdbarch_num_pseudo_regs (exp->gdbarch))
836 val = value_zero (register_type (exp->gdbarch, regno), not_lval);
838 val = value_of_register (regno, get_selected_frame (NULL));
840 error (_("Value of register %s not available."), name);
846 type = language_bool_type (exp->language_defn, exp->gdbarch);
847 return value_from_longest (type, exp->elts[pc + 1].longconst);
851 return value_of_internalvar (exp->gdbarch,
852 exp->elts[pc + 1].internalvar);
855 tem = longest_to_int (exp->elts[pc + 1].longconst);
856 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
857 if (noside == EVAL_SKIP)
859 type = language_string_char_type (exp->language_defn, exp->gdbarch);
860 return value_string (&exp->elts[pc + 2].string, tem, type);
862 case OP_OBJC_NSSTRING: /* Objective C Foundation Class
863 NSString constant. */
864 tem = longest_to_int (exp->elts[pc + 1].longconst);
865 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
866 if (noside == EVAL_SKIP)
870 return value_nsstring (exp->gdbarch, &exp->elts[pc + 2].string, tem + 1);
874 tem2 = longest_to_int (exp->elts[pc + 1].longconst);
875 tem3 = longest_to_int (exp->elts[pc + 2].longconst);
876 nargs = tem3 - tem2 + 1;
877 type = expect_type ? check_typedef (expect_type) : NULL_TYPE;
879 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
880 && TYPE_CODE (type) == TYPE_CODE_STRUCT)
882 struct value *rec = allocate_value (expect_type);
884 memset (value_contents_raw (rec), '\0', TYPE_LENGTH (type));
885 return evaluate_struct_tuple (rec, exp, pos, noside, nargs);
888 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
889 && TYPE_CODE (type) == TYPE_CODE_ARRAY)
891 struct type *range_type = TYPE_INDEX_TYPE (type);
892 struct type *element_type = TYPE_TARGET_TYPE (type);
893 struct value *array = allocate_value (expect_type);
894 int element_size = TYPE_LENGTH (check_typedef (element_type));
895 LONGEST low_bound, high_bound, index;
897 if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
900 high_bound = (TYPE_LENGTH (type) / element_size) - 1;
903 memset (value_contents_raw (array), 0, TYPE_LENGTH (expect_type));
904 for (tem = nargs; --nargs >= 0;)
906 struct value *element;
909 element = evaluate_subexp (element_type, exp, pos, noside);
910 if (value_type (element) != element_type)
911 element = value_cast (element_type, element);
914 int continue_pc = *pos;
917 index = init_array_element (array, element, exp, pos, noside,
918 low_bound, high_bound);
923 if (index > high_bound)
924 /* To avoid memory corruption. */
925 error (_("Too many array elements"));
926 memcpy (value_contents_raw (array)
927 + (index - low_bound) * element_size,
928 value_contents (element),
936 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
937 && TYPE_CODE (type) == TYPE_CODE_SET)
939 struct value *set = allocate_value (expect_type);
940 gdb_byte *valaddr = value_contents_raw (set);
941 struct type *element_type = TYPE_INDEX_TYPE (type);
942 struct type *check_type = element_type;
943 LONGEST low_bound, high_bound;
945 /* Get targettype of elementtype. */
946 while (TYPE_CODE (check_type) == TYPE_CODE_RANGE
947 || TYPE_CODE (check_type) == TYPE_CODE_TYPEDEF)
948 check_type = TYPE_TARGET_TYPE (check_type);
950 if (get_discrete_bounds (element_type, &low_bound, &high_bound) < 0)
951 error (_("(power)set type with unknown size"));
952 memset (valaddr, '\0', TYPE_LENGTH (type));
953 for (tem = 0; tem < nargs; tem++)
955 LONGEST range_low, range_high;
956 struct type *range_low_type, *range_high_type;
957 struct value *elem_val;
959 elem_val = evaluate_subexp (element_type, exp, pos, noside);
960 range_low_type = range_high_type = value_type (elem_val);
961 range_low = range_high = value_as_long (elem_val);
963 /* Check types of elements to avoid mixture of elements from
964 different types. Also check if type of element is "compatible"
965 with element type of powerset. */
966 if (TYPE_CODE (range_low_type) == TYPE_CODE_RANGE)
967 range_low_type = TYPE_TARGET_TYPE (range_low_type);
968 if (TYPE_CODE (range_high_type) == TYPE_CODE_RANGE)
969 range_high_type = TYPE_TARGET_TYPE (range_high_type);
970 if ((TYPE_CODE (range_low_type) != TYPE_CODE (range_high_type))
971 || (TYPE_CODE (range_low_type) == TYPE_CODE_ENUM
972 && (range_low_type != range_high_type)))
973 /* different element modes. */
974 error (_("POWERSET tuple elements of different mode"));
975 if ((TYPE_CODE (check_type) != TYPE_CODE (range_low_type))
976 || (TYPE_CODE (check_type) == TYPE_CODE_ENUM
977 && range_low_type != check_type))
978 error (_("incompatible POWERSET tuple elements"));
979 if (range_low > range_high)
981 warning (_("empty POWERSET tuple range"));
984 if (range_low < low_bound || range_high > high_bound)
985 error (_("POWERSET tuple element out of range"));
986 range_low -= low_bound;
987 range_high -= low_bound;
988 for (; range_low <= range_high; range_low++)
990 int bit_index = (unsigned) range_low % TARGET_CHAR_BIT;
992 if (gdbarch_bits_big_endian (exp->gdbarch))
993 bit_index = TARGET_CHAR_BIT - 1 - bit_index;
994 valaddr[(unsigned) range_low / TARGET_CHAR_BIT]
1001 argvec = XALLOCAVEC (struct value *, nargs);
1002 for (tem = 0; tem < nargs; tem++)
1004 /* Ensure that array expressions are coerced into pointer
1006 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
1008 if (noside == EVAL_SKIP)
1010 return value_array (tem2, tem3, argvec);
1014 struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1016 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
1018 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
1020 if (noside == EVAL_SKIP)
1022 return value_slice (array, lowbound, upper - lowbound + 1);
1026 /* Skip third and second args to evaluate the first one. */
1027 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1028 if (value_logical_not (arg1))
1030 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
1031 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
1035 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1036 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
1040 case OP_OBJC_SELECTOR:
1041 { /* Objective C @selector operator. */
1042 char *sel = &exp->elts[pc + 2].string;
1043 int len = longest_to_int (exp->elts[pc + 1].longconst);
1044 struct type *selector_type;
1046 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
1047 if (noside == EVAL_SKIP)
1051 sel[len] = 0; /* Make sure it's terminated. */
1053 selector_type = builtin_type (exp->gdbarch)->builtin_data_ptr;
1054 return value_from_longest (selector_type,
1055 lookup_child_selector (exp->gdbarch, sel));
1058 case OP_OBJC_MSGCALL:
1059 { /* Objective C message (method) call. */
1061 CORE_ADDR responds_selector = 0;
1062 CORE_ADDR method_selector = 0;
1064 CORE_ADDR selector = 0;
1066 int struct_return = 0;
1067 enum noside sub_no_side = EVAL_NORMAL;
1069 struct value *msg_send = NULL;
1070 struct value *msg_send_stret = NULL;
1071 int gnu_runtime = 0;
1073 struct value *target = NULL;
1074 struct value *method = NULL;
1075 struct value *called_method = NULL;
1077 struct type *selector_type = NULL;
1078 struct type *long_type;
1080 struct value *ret = NULL;
1083 selector = exp->elts[pc + 1].longconst;
1084 nargs = exp->elts[pc + 2].longconst;
1085 argvec = XALLOCAVEC (struct value *, nargs + 5);
1089 long_type = builtin_type (exp->gdbarch)->builtin_long;
1090 selector_type = builtin_type (exp->gdbarch)->builtin_data_ptr;
1092 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1093 sub_no_side = EVAL_NORMAL;
1095 sub_no_side = noside;
1097 target = evaluate_subexp (selector_type, exp, pos, sub_no_side);
1099 if (value_as_long (target) == 0)
1100 return value_from_longest (long_type, 0);
1102 if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0).minsym)
1105 /* Find the method dispatch (Apple runtime) or method lookup
1106 (GNU runtime) function for Objective-C. These will be used
1107 to lookup the symbol information for the method. If we
1108 can't find any symbol information, then we'll use these to
1109 call the method, otherwise we can call the method
1110 directly. The msg_send_stret function is used in the special
1111 case of a method that returns a structure (Apple runtime
1115 struct type *type = selector_type;
1117 type = lookup_function_type (type);
1118 type = lookup_pointer_type (type);
1119 type = lookup_function_type (type);
1120 type = lookup_pointer_type (type);
1122 msg_send = find_function_in_inferior ("objc_msg_lookup", NULL);
1124 = find_function_in_inferior ("objc_msg_lookup", NULL);
1126 msg_send = value_from_pointer (type, value_as_address (msg_send));
1127 msg_send_stret = value_from_pointer (type,
1128 value_as_address (msg_send_stret));
1132 msg_send = find_function_in_inferior ("objc_msgSend", NULL);
1133 /* Special dispatcher for methods returning structs. */
1135 = find_function_in_inferior ("objc_msgSend_stret", NULL);
1138 /* Verify the target object responds to this method. The
1139 standard top-level 'Object' class uses a different name for
1140 the verification method than the non-standard, but more
1141 often used, 'NSObject' class. Make sure we check for both. */
1144 = lookup_child_selector (exp->gdbarch, "respondsToSelector:");
1145 if (responds_selector == 0)
1147 = lookup_child_selector (exp->gdbarch, "respondsTo:");
1149 if (responds_selector == 0)
1150 error (_("no 'respondsTo:' or 'respondsToSelector:' method"));
1153 = lookup_child_selector (exp->gdbarch, "methodForSelector:");
1154 if (method_selector == 0)
1156 = lookup_child_selector (exp->gdbarch, "methodFor:");
1158 if (method_selector == 0)
1159 error (_("no 'methodFor:' or 'methodForSelector:' method"));
1161 /* Call the verification method, to make sure that the target
1162 class implements the desired method. */
1164 argvec[0] = msg_send;
1166 argvec[2] = value_from_longest (long_type, responds_selector);
1167 argvec[3] = value_from_longest (long_type, selector);
1170 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
1173 /* Function objc_msg_lookup returns a pointer. */
1175 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
1177 if (value_as_long (ret) == 0)
1178 error (_("Target does not respond to this message selector."));
1180 /* Call "methodForSelector:" method, to get the address of a
1181 function method that implements this selector for this
1182 class. If we can find a symbol at that address, then we
1183 know the return type, parameter types etc. (that's a good
1186 argvec[0] = msg_send;
1188 argvec[2] = value_from_longest (long_type, method_selector);
1189 argvec[3] = value_from_longest (long_type, selector);
1192 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
1196 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
1199 /* ret should now be the selector. */
1201 addr = value_as_long (ret);
1204 struct symbol *sym = NULL;
1206 /* The address might point to a function descriptor;
1207 resolve it to the actual code address instead. */
1208 addr = gdbarch_convert_from_func_ptr_addr (exp->gdbarch, addr,
1211 /* Is it a high_level symbol? */
1212 sym = find_pc_function (addr);
1214 method = value_of_variable (sym, 0);
1217 /* If we found a method with symbol information, check to see
1218 if it returns a struct. Otherwise assume it doesn't. */
1223 struct type *val_type;
1225 funaddr = find_function_addr (method, &val_type);
1227 block_for_pc (funaddr);
1229 val_type = check_typedef (val_type);
1231 if ((val_type == NULL)
1232 || (TYPE_CODE(val_type) == TYPE_CODE_ERROR))
1234 if (expect_type != NULL)
1235 val_type = expect_type;
1238 struct_return = using_struct_return (exp->gdbarch, method,
1241 else if (expect_type != NULL)
1243 struct_return = using_struct_return (exp->gdbarch, NULL,
1244 check_typedef (expect_type));
1247 /* Found a function symbol. Now we will substitute its
1248 value in place of the message dispatcher (obj_msgSend),
1249 so that we call the method directly instead of thru
1250 the dispatcher. The main reason for doing this is that
1251 we can now evaluate the return value and parameter values
1252 according to their known data types, in case we need to
1253 do things like promotion, dereferencing, special handling
1254 of structs and doubles, etc.
1256 We want to use the type signature of 'method', but still
1257 jump to objc_msgSend() or objc_msgSend_stret() to better
1258 mimic the behavior of the runtime. */
1262 if (TYPE_CODE (value_type (method)) != TYPE_CODE_FUNC)
1263 error (_("method address has symbol information "
1264 "with non-function type; skipping"));
1266 /* Create a function pointer of the appropriate type, and
1267 replace its value with the value of msg_send or
1268 msg_send_stret. We must use a pointer here, as
1269 msg_send and msg_send_stret are of pointer type, and
1270 the representation may be different on systems that use
1271 function descriptors. */
1274 = value_from_pointer (lookup_pointer_type (value_type (method)),
1275 value_as_address (msg_send_stret));
1278 = value_from_pointer (lookup_pointer_type (value_type (method)),
1279 value_as_address (msg_send));
1284 called_method = msg_send_stret;
1286 called_method = msg_send;
1289 if (noside == EVAL_SKIP)
1292 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1294 /* If the return type doesn't look like a function type,
1295 call an error. This can happen if somebody tries to
1296 turn a variable into a function call. This is here
1297 because people often want to call, eg, strcmp, which
1298 gdb doesn't know is a function. If gdb isn't asked for
1299 it's opinion (ie. through "whatis"), it won't offer
1302 struct type *type = value_type (called_method);
1304 if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
1305 type = TYPE_TARGET_TYPE (type);
1306 type = TYPE_TARGET_TYPE (type);
1310 if ((TYPE_CODE (type) == TYPE_CODE_ERROR) && expect_type)
1311 return allocate_value (expect_type);
1313 return allocate_value (type);
1316 error (_("Expression of type other than "
1317 "\"method returning ...\" used as a method"));
1320 /* Now depending on whether we found a symbol for the method,
1321 we will either call the runtime dispatcher or the method
1324 argvec[0] = called_method;
1326 argvec[2] = value_from_longest (long_type, selector);
1327 /* User-supplied arguments. */
1328 for (tem = 0; tem < nargs; tem++)
1329 argvec[tem + 3] = evaluate_subexp_with_coercion (exp, pos, noside);
1330 argvec[tem + 3] = 0;
1332 if (gnu_runtime && (method != NULL))
1334 /* Function objc_msg_lookup returns a pointer. */
1335 deprecated_set_value_type (argvec[0],
1336 lookup_pointer_type (lookup_function_type (value_type (argvec[0]))));
1338 = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
1341 ret = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
1348 op = exp->elts[*pos].opcode;
1349 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1350 /* Allocate arg vector, including space for the function to be
1351 called in argvec[0], a potential `this', and a terminating NULL. */
1352 argvec = (struct value **)
1353 alloca (sizeof (struct value *) * (nargs + 3));
1354 if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
1356 /* First, evaluate the structure into arg2. */
1359 if (op == STRUCTOP_MEMBER)
1361 arg2 = evaluate_subexp_for_address (exp, pos, noside);
1365 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1368 /* If the function is a virtual function, then the
1369 aggregate value (providing the structure) plays
1370 its part by providing the vtable. Otherwise,
1371 it is just along for the ride: call the function
1374 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1376 type = check_typedef (value_type (arg1));
1377 if (noside == EVAL_SKIP)
1378 tem = 1; /* Set it to the right arg index so that all arguments
1379 can also be skipped. */
1380 else if (TYPE_CODE (type) == TYPE_CODE_METHODPTR)
1382 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1383 arg1 = value_zero (TYPE_TARGET_TYPE (type), not_lval);
1385 arg1 = cplus_method_ptr_to_value (&arg2, arg1);
1387 /* Now, say which argument to start evaluating from. */
1392 else if (TYPE_CODE (type) == TYPE_CODE_MEMBERPTR)
1394 struct type *type_ptr
1395 = lookup_pointer_type (TYPE_SELF_TYPE (type));
1396 struct type *target_type_ptr
1397 = lookup_pointer_type (TYPE_TARGET_TYPE (type));
1399 /* Now, convert these values to an address. */
1400 arg2 = value_cast (type_ptr, arg2);
1402 mem_offset = value_as_long (arg1);
1404 arg1 = value_from_pointer (target_type_ptr,
1405 value_as_long (arg2) + mem_offset);
1406 arg1 = value_ind (arg1);
1410 error (_("Non-pointer-to-member value used in pointer-to-member "
1413 else if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
1415 /* Hair for method invocations. */
1419 /* First, evaluate the structure into arg2. */
1421 tem2 = longest_to_int (exp->elts[pc2 + 1].longconst);
1422 *pos += 3 + BYTES_TO_EXP_ELEM (tem2 + 1);
1424 if (op == STRUCTOP_STRUCT)
1426 /* If v is a variable in a register, and the user types
1427 v.method (), this will produce an error, because v has
1430 A possible way around this would be to allocate a
1431 copy of the variable on the stack, copy in the
1432 contents, call the function, and copy out the
1433 contents. I.e. convert this from call by reference
1434 to call by copy-return (or whatever it's called).
1435 However, this does not work because it is not the
1436 same: the method being called could stash a copy of
1437 the address, and then future uses through that address
1438 (after the method returns) would be expected to
1439 use the variable itself, not some copy of it. */
1440 arg2 = evaluate_subexp_for_address (exp, pos, noside);
1444 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1446 /* Check to see if the operator '->' has been
1447 overloaded. If the operator has been overloaded
1448 replace arg2 with the value returned by the custom
1449 operator and continue evaluation. */
1450 while (unop_user_defined_p (op, arg2))
1452 struct value *value = NULL;
1455 value = value_x_unop (arg2, op, noside);
1458 CATCH (except, RETURN_MASK_ERROR)
1460 if (except.error == NOT_FOUND_ERROR)
1463 throw_exception (except);
1470 /* Now, say which argument to start evaluating from. */
1473 else if (op == OP_SCOPE
1474 && overload_resolution
1475 && (exp->language_defn->la_language == language_cplus))
1477 /* Unpack it locally so we can properly handle overload
1483 local_tem = longest_to_int (exp->elts[pc2 + 2].longconst);
1484 (*pos) += 4 + BYTES_TO_EXP_ELEM (local_tem + 1);
1485 type = exp->elts[pc2 + 1].type;
1486 name = &exp->elts[pc2 + 3].string;
1489 function_name = NULL;
1490 if (TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
1492 function = cp_lookup_symbol_namespace (TYPE_TAG_NAME (type),
1494 get_selected_block (0),
1496 if (function == NULL)
1497 error (_("No symbol \"%s\" in namespace \"%s\"."),
1498 name, TYPE_TAG_NAME (type));
1501 /* arg2 is left as NULL on purpose. */
1505 gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT
1506 || TYPE_CODE (type) == TYPE_CODE_UNION);
1507 function_name = name;
1509 /* We need a properly typed value for method lookup. For
1510 static methods arg2 is otherwise unused. */
1511 arg2 = value_zero (type, lval_memory);
1516 else if (op == OP_ADL_FUNC)
1518 /* Save the function position and move pos so that the arguments
1519 can be evaluated. */
1525 func_name_len = longest_to_int (exp->elts[save_pos1 + 3].longconst);
1526 (*pos) += 6 + BYTES_TO_EXP_ELEM (func_name_len + 1);
1530 /* Non-method function call. */
1534 /* If this is a C++ function wait until overload resolution. */
1535 if (op == OP_VAR_VALUE
1536 && overload_resolution
1537 && (exp->language_defn->la_language == language_cplus))
1539 (*pos) += 4; /* Skip the evaluation of the symbol. */
1544 argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside);
1545 type = value_type (argvec[0]);
1546 if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
1547 type = TYPE_TARGET_TYPE (type);
1548 if (type && TYPE_CODE (type) == TYPE_CODE_FUNC)
1550 for (; tem <= nargs && tem <= TYPE_NFIELDS (type); tem++)
1552 argvec[tem] = evaluate_subexp (TYPE_FIELD_TYPE (type,
1560 /* Evaluate arguments (if not already done, e.g., namespace::func()
1561 and overload-resolution is off). */
1562 for (; tem <= nargs; tem++)
1564 /* Ensure that array expressions are coerced into pointer
1566 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
1569 /* Signal end of arglist. */
1572 if (noside == EVAL_SKIP)
1575 if (op == OP_ADL_FUNC)
1577 struct symbol *symp;
1580 int string_pc = save_pos1 + 3;
1582 /* Extract the function name. */
1583 name_len = longest_to_int (exp->elts[string_pc].longconst);
1584 func_name = (char *) alloca (name_len + 1);
1585 strcpy (func_name, &exp->elts[string_pc + 1].string);
1587 find_overload_match (&argvec[1], nargs, func_name,
1588 NON_METHOD, /* not method */
1589 NULL, NULL, /* pass NULL symbol since
1590 symbol is unknown */
1591 NULL, &symp, NULL, 0, noside);
1593 /* Now fix the expression being evaluated. */
1594 exp->elts[save_pos1 + 2].symbol = symp;
1595 argvec[0] = evaluate_subexp_with_coercion (exp, &save_pos1, noside);
1598 if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR
1599 || (op == OP_SCOPE && function_name != NULL))
1601 int static_memfuncp;
1604 /* Method invocation: stuff "this" as first parameter.
1605 If the method turns out to be static we undo this below. */
1610 /* Name of method from expression. */
1611 tstr = &exp->elts[pc2 + 2].string;
1614 tstr = function_name;
1616 if (overload_resolution && (exp->language_defn->la_language
1619 /* Language is C++, do some overload resolution before
1621 struct value *valp = NULL;
1623 (void) find_overload_match (&argvec[1], nargs, tstr,
1624 METHOD, /* method */
1625 &arg2, /* the object */
1627 &static_memfuncp, 0, noside);
1629 if (op == OP_SCOPE && !static_memfuncp)
1631 /* For the time being, we don't handle this. */
1632 error (_("Call to overloaded function %s requires "
1636 argvec[1] = arg2; /* the ``this'' pointer */
1637 argvec[0] = valp; /* Use the method found after overload
1641 /* Non-C++ case -- or no overload resolution. */
1643 struct value *temp = arg2;
1645 argvec[0] = value_struct_elt (&temp, argvec + 1, tstr,
1647 op == STRUCTOP_STRUCT
1648 ? "structure" : "structure pointer");
1649 /* value_struct_elt updates temp with the correct value
1650 of the ``this'' pointer if necessary, so modify argvec[1] to
1651 reflect any ``this'' changes. */
1653 = value_from_longest (lookup_pointer_type(value_type (temp)),
1654 value_address (temp)
1655 + value_embedded_offset (temp));
1656 argvec[1] = arg2; /* the ``this'' pointer */
1659 /* Take out `this' if needed. */
1660 if (static_memfuncp)
1662 argvec[1] = argvec[0];
1667 else if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
1669 /* Pointer to member. argvec[1] is already set up. */
1672 else if (op == OP_VAR_VALUE || (op == OP_SCOPE && function != NULL))
1674 /* Non-member function being called. */
1675 /* fn: This can only be done for C++ functions. A C-style function
1676 in a C++ program, for instance, does not have the fields that
1677 are expected here. */
1679 if (overload_resolution && (exp->language_defn->la_language
1682 /* Language is C++, do some overload resolution before
1684 struct symbol *symp;
1687 /* If a scope has been specified disable ADL. */
1691 if (op == OP_VAR_VALUE)
1692 function = exp->elts[save_pos1+2].symbol;
1694 (void) find_overload_match (&argvec[1], nargs,
1695 NULL, /* no need for name */
1696 NON_METHOD, /* not method */
1697 NULL, function, /* the function */
1698 NULL, &symp, NULL, no_adl, noside);
1700 if (op == OP_VAR_VALUE)
1702 /* Now fix the expression being evaluated. */
1703 exp->elts[save_pos1+2].symbol = symp;
1704 argvec[0] = evaluate_subexp_with_coercion (exp, &save_pos1,
1708 argvec[0] = value_of_variable (symp, get_selected_block (0));
1712 /* Not C++, or no overload resolution allowed. */
1713 /* Nothing to be done; argvec already correctly set up. */
1718 /* It is probably a C-style function. */
1719 /* Nothing to be done; argvec already correctly set up. */
1724 if (argvec[0] == NULL)
1725 error (_("Cannot evaluate function -- may be inlined"));
1726 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1728 /* If the return type doesn't look like a function type, call an
1729 error. This can happen if somebody tries to turn a variable into
1730 a function call. This is here because people often want to
1731 call, eg, strcmp, which gdb doesn't know is a function. If
1732 gdb isn't asked for it's opinion (ie. through "whatis"),
1733 it won't offer it. */
1735 struct type *ftype = value_type (argvec[0]);
1737 if (TYPE_CODE (ftype) == TYPE_CODE_INTERNAL_FUNCTION)
1739 /* We don't know anything about what the internal
1740 function might return, but we have to return
1742 return value_zero (builtin_type (exp->gdbarch)->builtin_int,
1745 else if (TYPE_CODE (ftype) == TYPE_CODE_XMETHOD)
1747 struct type *return_type
1748 = result_type_of_xmethod (argvec[0], nargs, argvec + 1);
1750 if (return_type == NULL)
1751 error (_("Xmethod is missing return type."));
1752 return value_zero (return_type, not_lval);
1754 else if (TYPE_GNU_IFUNC (ftype))
1755 return allocate_value (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (ftype)));
1756 else if (TYPE_TARGET_TYPE (ftype))
1757 return allocate_value (TYPE_TARGET_TYPE (ftype));
1759 error (_("Expression of type other than "
1760 "\"Function returning ...\" used as function"));
1762 switch (TYPE_CODE (value_type (argvec[0])))
1764 case TYPE_CODE_INTERNAL_FUNCTION:
1765 return call_internal_function (exp->gdbarch, exp->language_defn,
1766 argvec[0], nargs, argvec + 1);
1767 case TYPE_CODE_XMETHOD:
1768 return call_xmethod (argvec[0], nargs, argvec + 1);
1770 return call_function_by_hand (argvec[0], nargs, argvec + 1);
1772 /* pai: FIXME save value from call_function_by_hand, then adjust
1773 pc by adjust_fn_pc if +ve. */
1775 case OP_F77_UNDETERMINED_ARGLIST:
1777 /* Remember that in F77, functions, substring ops and
1778 array subscript operations cannot be disambiguated
1779 at parse time. We have made all array subscript operations,
1780 substring operations as well as function calls come here
1781 and we now have to discover what the heck this thing actually was.
1782 If it is a function, we process just as if we got an OP_FUNCALL. */
1784 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1787 /* First determine the type code we are dealing with. */
1788 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1789 type = check_typedef (value_type (arg1));
1790 code = TYPE_CODE (type);
1792 if (code == TYPE_CODE_PTR)
1794 /* Fortran always passes variable to subroutines as pointer.
1795 So we need to look into its target type to see if it is
1796 array, string or function. If it is, we need to switch
1797 to the target value the original one points to. */
1798 struct type *target_type = check_typedef (TYPE_TARGET_TYPE (type));
1800 if (TYPE_CODE (target_type) == TYPE_CODE_ARRAY
1801 || TYPE_CODE (target_type) == TYPE_CODE_STRING
1802 || TYPE_CODE (target_type) == TYPE_CODE_FUNC)
1804 arg1 = value_ind (arg1);
1805 type = check_typedef (value_type (arg1));
1806 code = TYPE_CODE (type);
1812 case TYPE_CODE_ARRAY:
1813 if (exp->elts[*pos].opcode == OP_F90_RANGE)
1814 return value_f90_subarray (arg1, exp, pos, noside);
1816 goto multi_f77_subscript;
1818 case TYPE_CODE_STRING:
1819 if (exp->elts[*pos].opcode == OP_F90_RANGE)
1820 return value_f90_subarray (arg1, exp, pos, noside);
1823 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1824 return value_subscript (arg1, value_as_long (arg2));
1828 case TYPE_CODE_FUNC:
1829 /* It's a function call. */
1830 /* Allocate arg vector, including space for the function to be
1831 called in argvec[0] and a terminating NULL. */
1832 argvec = (struct value **)
1833 alloca (sizeof (struct value *) * (nargs + 2));
1836 for (; tem <= nargs; tem++)
1837 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
1838 argvec[tem] = 0; /* signal end of arglist */
1839 if (noside == EVAL_SKIP)
1844 error (_("Cannot perform substring on this type"));
1848 /* We have a complex number, There should be 2 floating
1849 point numbers that compose it. */
1851 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1852 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1854 return value_literal_complex (arg1, arg2, exp->elts[pc + 1].type);
1856 case STRUCTOP_STRUCT:
1857 tem = longest_to_int (exp->elts[pc + 1].longconst);
1858 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
1859 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1860 if (noside == EVAL_SKIP)
1862 arg3 = value_struct_elt (&arg1, NULL, &exp->elts[pc + 2].string,
1864 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1865 arg3 = value_zero (value_type (arg3), VALUE_LVAL (arg3));
1869 tem = longest_to_int (exp->elts[pc + 1].longconst);
1870 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
1871 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1872 if (noside == EVAL_SKIP)
1875 /* Check to see if operator '->' has been overloaded. If so replace
1876 arg1 with the value returned by evaluating operator->(). */
1877 while (unop_user_defined_p (op, arg1))
1879 struct value *value = NULL;
1882 value = value_x_unop (arg1, op, noside);
1885 CATCH (except, RETURN_MASK_ERROR)
1887 if (except.error == NOT_FOUND_ERROR)
1890 throw_exception (except);
1897 /* JYG: if print object is on we need to replace the base type
1898 with rtti type in order to continue on with successful
1899 lookup of member / method only available in the rtti type. */
1901 struct type *type = value_type (arg1);
1902 struct type *real_type;
1903 int full, top, using_enc;
1904 struct value_print_options opts;
1906 get_user_print_options (&opts);
1907 if (opts.objectprint && TYPE_TARGET_TYPE(type)
1908 && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT))
1910 real_type = value_rtti_indirect_type (arg1, &full, &top,
1913 arg1 = value_cast (real_type, arg1);
1917 arg3 = value_struct_elt (&arg1, NULL, &exp->elts[pc + 2].string,
1918 NULL, "structure pointer");
1919 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1920 arg3 = value_zero (value_type (arg3), not_lval);
1923 case STRUCTOP_MEMBER:
1925 if (op == STRUCTOP_MEMBER)
1926 arg1 = evaluate_subexp_for_address (exp, pos, noside);
1928 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1930 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1932 if (noside == EVAL_SKIP)
1935 type = check_typedef (value_type (arg2));
1936 switch (TYPE_CODE (type))
1938 case TYPE_CODE_METHODPTR:
1939 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1940 return value_zero (TYPE_TARGET_TYPE (type), not_lval);
1943 arg2 = cplus_method_ptr_to_value (&arg1, arg2);
1944 gdb_assert (TYPE_CODE (value_type (arg2)) == TYPE_CODE_PTR);
1945 return value_ind (arg2);
1948 case TYPE_CODE_MEMBERPTR:
1949 /* Now, convert these values to an address. */
1950 arg1 = value_cast_pointers (lookup_pointer_type (TYPE_SELF_TYPE (type)),
1953 mem_offset = value_as_long (arg2);
1955 arg3 = value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
1956 value_as_long (arg1) + mem_offset);
1957 return value_ind (arg3);
1960 error (_("non-pointer-to-member value used "
1961 "in pointer-to-member construct"));
1965 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1966 arg_types = (struct type **) alloca (nargs * sizeof (struct type *));
1967 for (ix = 0; ix < nargs; ++ix)
1968 arg_types[ix] = exp->elts[pc + 1 + ix + 1].type;
1970 expect_type = make_params (nargs, arg_types);
1971 *(pos) += 3 + nargs;
1972 arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside);
1973 xfree (TYPE_FIELDS (expect_type));
1974 xfree (TYPE_MAIN_TYPE (expect_type));
1975 xfree (expect_type);
1979 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1980 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1981 if (noside == EVAL_SKIP)
1983 if (binop_user_defined_p (op, arg1, arg2))
1984 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1986 return value_concat (arg1, arg2);
1989 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1990 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1992 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1994 if (binop_user_defined_p (op, arg1, arg2))
1995 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1997 return value_assign (arg1, arg2);
1999 case BINOP_ASSIGN_MODIFY:
2001 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2002 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
2003 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2005 op = exp->elts[pc + 1].opcode;
2006 if (binop_user_defined_p (op, arg1, arg2))
2007 return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op, noside);
2008 else if (op == BINOP_ADD && ptrmath_type_p (exp->language_defn,
2010 && is_integral_type (value_type (arg2)))
2011 arg2 = value_ptradd (arg1, value_as_long (arg2));
2012 else if (op == BINOP_SUB && ptrmath_type_p (exp->language_defn,
2014 && is_integral_type (value_type (arg2)))
2015 arg2 = value_ptradd (arg1, - value_as_long (arg2));
2018 struct value *tmp = arg1;
2020 /* For shift and integer exponentiation operations,
2021 only promote the first argument. */
2022 if ((op == BINOP_LSH || op == BINOP_RSH || op == BINOP_EXP)
2023 && is_integral_type (value_type (arg2)))
2024 unop_promote (exp->language_defn, exp->gdbarch, &tmp);
2026 binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2);
2028 arg2 = value_binop (tmp, arg2, op);
2030 return value_assign (arg1, arg2);
2033 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
2034 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
2035 if (noside == EVAL_SKIP)
2037 if (binop_user_defined_p (op, arg1, arg2))
2038 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2039 else if (ptrmath_type_p (exp->language_defn, value_type (arg1))
2040 && is_integral_type (value_type (arg2)))
2041 return value_ptradd (arg1, value_as_long (arg2));
2042 else if (ptrmath_type_p (exp->language_defn, value_type (arg2))
2043 && is_integral_type (value_type (arg1)))
2044 return value_ptradd (arg2, value_as_long (arg1));
2047 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2048 return value_binop (arg1, arg2, BINOP_ADD);
2052 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
2053 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
2054 if (noside == EVAL_SKIP)
2056 if (binop_user_defined_p (op, arg1, arg2))
2057 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2058 else if (ptrmath_type_p (exp->language_defn, value_type (arg1))
2059 && ptrmath_type_p (exp->language_defn, value_type (arg2)))
2061 /* FIXME -- should be ptrdiff_t */
2062 type = builtin_type (exp->gdbarch)->builtin_long;
2063 return value_from_longest (type, value_ptrdiff (arg1, arg2));
2065 else if (ptrmath_type_p (exp->language_defn, value_type (arg1))
2066 && is_integral_type (value_type (arg2)))
2067 return value_ptradd (arg1, - value_as_long (arg2));
2070 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2071 return value_binop (arg1, arg2, BINOP_SUB);
2082 case BINOP_BITWISE_AND:
2083 case BINOP_BITWISE_IOR:
2084 case BINOP_BITWISE_XOR:
2085 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2086 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2087 if (noside == EVAL_SKIP)
2089 if (binop_user_defined_p (op, arg1, arg2))
2090 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2093 /* If EVAL_AVOID_SIDE_EFFECTS and we're dividing by zero,
2094 fudge arg2 to avoid division-by-zero, the caller is
2095 (theoretically) only looking for the type of the result. */
2096 if (noside == EVAL_AVOID_SIDE_EFFECTS
2097 /* ??? Do we really want to test for BINOP_MOD here?
2098 The implementation of value_binop gives it a well-defined
2101 || op == BINOP_INTDIV
2104 && value_logical_not (arg2))
2106 struct value *v_one, *retval;
2108 v_one = value_one (value_type (arg2));
2109 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &v_one);
2110 retval = value_binop (arg1, v_one, op);
2115 /* For shift and integer exponentiation operations,
2116 only promote the first argument. */
2117 if ((op == BINOP_LSH || op == BINOP_RSH || op == BINOP_EXP)
2118 && is_integral_type (value_type (arg2)))
2119 unop_promote (exp->language_defn, exp->gdbarch, &arg1);
2121 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2123 return value_binop (arg1, arg2, op);
2127 case BINOP_SUBSCRIPT:
2128 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2129 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2130 if (noside == EVAL_SKIP)
2132 if (binop_user_defined_p (op, arg1, arg2))
2133 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2136 /* If the user attempts to subscript something that is not an
2137 array or pointer type (like a plain int variable for example),
2138 then report this as an error. */
2140 arg1 = coerce_ref (arg1);
2141 type = check_typedef (value_type (arg1));
2142 if (TYPE_CODE (type) != TYPE_CODE_ARRAY
2143 && TYPE_CODE (type) != TYPE_CODE_PTR)
2145 if (TYPE_NAME (type))
2146 error (_("cannot subscript something of type `%s'"),
2149 error (_("cannot subscript requested type"));
2152 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2153 return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
2155 return value_subscript (arg1, value_as_long (arg2));
2157 case MULTI_SUBSCRIPT:
2159 nargs = longest_to_int (exp->elts[pc + 1].longconst);
2160 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
2163 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
2164 /* FIXME: EVAL_SKIP handling may not be correct. */
2165 if (noside == EVAL_SKIP)
2176 /* FIXME: EVAL_AVOID_SIDE_EFFECTS handling may not be correct. */
2177 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2179 /* If the user attempts to subscript something that has no target
2180 type (like a plain int variable for example), then report this
2183 type = TYPE_TARGET_TYPE (check_typedef (value_type (arg1)));
2186 arg1 = value_zero (type, VALUE_LVAL (arg1));
2192 error (_("cannot subscript something of type `%s'"),
2193 TYPE_NAME (value_type (arg1)));
2197 if (binop_user_defined_p (op, arg1, arg2))
2199 arg1 = value_x_binop (arg1, arg2, op, OP_NULL, noside);
2203 arg1 = coerce_ref (arg1);
2204 type = check_typedef (value_type (arg1));
2206 switch (TYPE_CODE (type))
2209 case TYPE_CODE_ARRAY:
2210 case TYPE_CODE_STRING:
2211 arg1 = value_subscript (arg1, value_as_long (arg2));
2215 if (TYPE_NAME (type))
2216 error (_("cannot subscript something of type `%s'"),
2219 error (_("cannot subscript requested type"));
2225 multi_f77_subscript:
2227 LONGEST subscript_array[MAX_FORTRAN_DIMS];
2228 int ndimensions = 1, i;
2229 struct value *array = arg1;
2231 if (nargs > MAX_FORTRAN_DIMS)
2232 error (_("Too many subscripts for F77 (%d Max)"), MAX_FORTRAN_DIMS);
2234 ndimensions = calc_f77_array_dims (type);
2236 if (nargs != ndimensions)
2237 error (_("Wrong number of subscripts"));
2239 gdb_assert (nargs > 0);
2241 /* Now that we know we have a legal array subscript expression
2242 let us actually find out where this element exists in the array. */
2244 /* Take array indices left to right. */
2245 for (i = 0; i < nargs; i++)
2247 /* Evaluate each subscript; it must be a legal integer in F77. */
2248 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
2250 /* Fill in the subscript array. */
2252 subscript_array[i] = value_as_long (arg2);
2255 /* Internal type of array is arranged right to left. */
2256 for (i = nargs; i > 0; i--)
2258 struct type *array_type = check_typedef (value_type (array));
2259 LONGEST index = subscript_array[i - 1];
2261 array = value_subscripted_rvalue (array, index,
2262 f77_get_lowerbound (array_type));
2268 case BINOP_LOGICAL_AND:
2269 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2270 if (noside == EVAL_SKIP)
2272 evaluate_subexp (NULL_TYPE, exp, pos, noside);
2277 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2280 if (binop_user_defined_p (op, arg1, arg2))
2282 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2283 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2287 tem = value_logical_not (arg1);
2288 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
2289 (tem ? EVAL_SKIP : noside));
2290 type = language_bool_type (exp->language_defn, exp->gdbarch);
2291 return value_from_longest (type,
2292 (LONGEST) (!tem && !value_logical_not (arg2)));
2295 case BINOP_LOGICAL_OR:
2296 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2297 if (noside == EVAL_SKIP)
2299 evaluate_subexp (NULL_TYPE, exp, pos, noside);
2304 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2307 if (binop_user_defined_p (op, arg1, arg2))
2309 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2310 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2314 tem = value_logical_not (arg1);
2315 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
2316 (!tem ? EVAL_SKIP : noside));
2317 type = language_bool_type (exp->language_defn, exp->gdbarch);
2318 return value_from_longest (type,
2319 (LONGEST) (!tem || !value_logical_not (arg2)));
2323 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2324 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
2325 if (noside == EVAL_SKIP)
2327 if (binop_user_defined_p (op, arg1, arg2))
2329 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2333 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2334 tem = value_equal (arg1, arg2);
2335 type = language_bool_type (exp->language_defn, exp->gdbarch);
2336 return value_from_longest (type, (LONGEST) tem);
2339 case BINOP_NOTEQUAL:
2340 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2341 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
2342 if (noside == EVAL_SKIP)
2344 if (binop_user_defined_p (op, arg1, arg2))
2346 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2350 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2351 tem = value_equal (arg1, arg2);
2352 type = language_bool_type (exp->language_defn, exp->gdbarch);
2353 return value_from_longest (type, (LONGEST) ! tem);
2357 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2358 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
2359 if (noside == EVAL_SKIP)
2361 if (binop_user_defined_p (op, arg1, arg2))
2363 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2367 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2368 tem = value_less (arg1, arg2);
2369 type = language_bool_type (exp->language_defn, exp->gdbarch);
2370 return value_from_longest (type, (LONGEST) tem);
2374 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2375 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
2376 if (noside == EVAL_SKIP)
2378 if (binop_user_defined_p (op, arg1, arg2))
2380 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2384 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2385 tem = value_less (arg2, arg1);
2386 type = language_bool_type (exp->language_defn, exp->gdbarch);
2387 return value_from_longest (type, (LONGEST) tem);
2391 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2392 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
2393 if (noside == EVAL_SKIP)
2395 if (binop_user_defined_p (op, arg1, arg2))
2397 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2401 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2402 tem = value_less (arg2, arg1) || value_equal (arg1, arg2);
2403 type = language_bool_type (exp->language_defn, exp->gdbarch);
2404 return value_from_longest (type, (LONGEST) tem);
2408 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2409 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
2410 if (noside == EVAL_SKIP)
2412 if (binop_user_defined_p (op, arg1, arg2))
2414 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
2418 binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
2419 tem = value_less (arg1, arg2) || value_equal (arg1, arg2);
2420 type = language_bool_type (exp->language_defn, exp->gdbarch);
2421 return value_from_longest (type, (LONGEST) tem);
2425 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2426 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2427 if (noside == EVAL_SKIP)
2429 type = check_typedef (value_type (arg2));
2430 if (TYPE_CODE (type) != TYPE_CODE_INT
2431 && TYPE_CODE (type) != TYPE_CODE_ENUM)
2432 error (_("Non-integral right operand for \"@\" operator."));
2433 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2435 return allocate_repeat_value (value_type (arg1),
2436 longest_to_int (value_as_long (arg2)));
2439 return value_repeat (arg1, longest_to_int (value_as_long (arg2)));
2442 evaluate_subexp (NULL_TYPE, exp, pos, noside);
2443 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
2446 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2447 if (noside == EVAL_SKIP)
2449 if (unop_user_defined_p (op, arg1))
2450 return value_x_unop (arg1, op, noside);
2453 unop_promote (exp->language_defn, exp->gdbarch, &arg1);
2454 return value_pos (arg1);
2458 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2459 if (noside == EVAL_SKIP)
2461 if (unop_user_defined_p (op, arg1))
2462 return value_x_unop (arg1, op, noside);
2465 unop_promote (exp->language_defn, exp->gdbarch, &arg1);
2466 return value_neg (arg1);
2469 case UNOP_COMPLEMENT:
2470 /* C++: check for and handle destructor names. */
2471 op = exp->elts[*pos].opcode;
2473 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2474 if (noside == EVAL_SKIP)
2476 if (unop_user_defined_p (UNOP_COMPLEMENT, arg1))
2477 return value_x_unop (arg1, UNOP_COMPLEMENT, noside);
2480 unop_promote (exp->language_defn, exp->gdbarch, &arg1);
2481 return value_complement (arg1);
2484 case UNOP_LOGICAL_NOT:
2485 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2486 if (noside == EVAL_SKIP)
2488 if (unop_user_defined_p (op, arg1))
2489 return value_x_unop (arg1, op, noside);
2492 type = language_bool_type (exp->language_defn, exp->gdbarch);
2493 return value_from_longest (type, (LONGEST) value_logical_not (arg1));
2497 if (expect_type && TYPE_CODE (expect_type) == TYPE_CODE_PTR)
2498 expect_type = TYPE_TARGET_TYPE (check_typedef (expect_type));
2499 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2500 type = check_typedef (value_type (arg1));
2501 if (TYPE_CODE (type) == TYPE_CODE_METHODPTR
2502 || TYPE_CODE (type) == TYPE_CODE_MEMBERPTR)
2503 error (_("Attempt to dereference pointer "
2504 "to member without an object"));
2505 if (noside == EVAL_SKIP)
2507 if (unop_user_defined_p (op, arg1))
2508 return value_x_unop (arg1, op, noside);
2509 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
2511 type = check_typedef (value_type (arg1));
2512 if (TYPE_CODE (type) == TYPE_CODE_PTR
2513 || TYPE_CODE (type) == TYPE_CODE_REF
2514 /* In C you can dereference an array to get the 1st elt. */
2515 || TYPE_CODE (type) == TYPE_CODE_ARRAY
2517 return value_zero (TYPE_TARGET_TYPE (type),
2519 else if (TYPE_CODE (type) == TYPE_CODE_INT)
2520 /* GDB allows dereferencing an int. */
2521 return value_zero (builtin_type (exp->gdbarch)->builtin_int,
2524 error (_("Attempt to take contents of a non-pointer value."));
2527 /* Allow * on an integer so we can cast it to whatever we want.
2528 This returns an int, which seems like the most C-like thing to
2529 do. "long long" variables are rare enough that
2530 BUILTIN_TYPE_LONGEST would seem to be a mistake. */
2531 if (TYPE_CODE (type) == TYPE_CODE_INT)
2532 return value_at_lazy (builtin_type (exp->gdbarch)->builtin_int,
2533 (CORE_ADDR) value_as_address (arg1));
2534 return value_ind (arg1);
2537 /* C++: check for and handle pointer to members. */
2539 op = exp->elts[*pos].opcode;
2541 if (noside == EVAL_SKIP)
2543 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
2548 struct value *retvalp = evaluate_subexp_for_address (exp, pos,
2555 if (noside == EVAL_SKIP)
2557 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
2560 return evaluate_subexp_for_sizeof (exp, pos, noside);
2564 type = exp->elts[pc + 1].type;
2565 arg1 = evaluate_subexp (type, exp, pos, noside);
2566 if (noside == EVAL_SKIP)
2568 if (type != value_type (arg1))
2569 arg1 = value_cast (type, arg1);
2572 case UNOP_CAST_TYPE:
2573 arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2574 type = value_type (arg1);
2575 arg1 = evaluate_subexp (type, exp, pos, noside);
2576 if (noside == EVAL_SKIP)
2578 if (type != value_type (arg1))
2579 arg1 = value_cast (type, arg1);
2582 case UNOP_DYNAMIC_CAST:
2583 arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2584 type = value_type (arg1);
2585 arg1 = evaluate_subexp (type, exp, pos, noside);
2586 if (noside == EVAL_SKIP)
2588 return value_dynamic_cast (type, arg1);
2590 case UNOP_REINTERPRET_CAST:
2591 arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2592 type = value_type (arg1);
2593 arg1 = evaluate_subexp (type, exp, pos, noside);
2594 if (noside == EVAL_SKIP)
2596 return value_reinterpret_cast (type, arg1);
2600 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2601 if (noside == EVAL_SKIP)
2603 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2604 return value_zero (exp->elts[pc + 1].type, lval_memory);
2606 return value_at_lazy (exp->elts[pc + 1].type,
2607 value_as_address (arg1));
2609 case UNOP_MEMVAL_TYPE:
2610 arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2611 type = value_type (arg1);
2612 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2613 if (noside == EVAL_SKIP)
2615 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2616 return value_zero (type, lval_memory);
2618 return value_at_lazy (type, value_as_address (arg1));
2620 case UNOP_MEMVAL_TLS:
2622 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2623 if (noside == EVAL_SKIP)
2625 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2626 return value_zero (exp->elts[pc + 2].type, lval_memory);
2631 tls_addr = target_translate_tls_address (exp->elts[pc + 1].objfile,
2632 value_as_address (arg1));
2633 return value_at_lazy (exp->elts[pc + 2].type, tls_addr);
2636 case UNOP_PREINCREMENT:
2637 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2638 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2640 else if (unop_user_defined_p (op, arg1))
2642 return value_x_unop (arg1, op, noside);
2646 if (ptrmath_type_p (exp->language_defn, value_type (arg1)))
2647 arg2 = value_ptradd (arg1, 1);
2650 struct value *tmp = arg1;
2652 arg2 = value_one (value_type (arg1));
2653 binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2);
2654 arg2 = value_binop (tmp, arg2, BINOP_ADD);
2657 return value_assign (arg1, arg2);
2660 case UNOP_PREDECREMENT:
2661 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2662 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2664 else if (unop_user_defined_p (op, arg1))
2666 return value_x_unop (arg1, op, noside);
2670 if (ptrmath_type_p (exp->language_defn, value_type (arg1)))
2671 arg2 = value_ptradd (arg1, -1);
2674 struct value *tmp = arg1;
2676 arg2 = value_one (value_type (arg1));
2677 binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2);
2678 arg2 = value_binop (tmp, arg2, BINOP_SUB);
2681 return value_assign (arg1, arg2);
2684 case UNOP_POSTINCREMENT:
2685 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2686 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2688 else if (unop_user_defined_p (op, arg1))
2690 return value_x_unop (arg1, op, noside);
2694 arg3 = value_non_lval (arg1);
2696 if (ptrmath_type_p (exp->language_defn, value_type (arg1)))
2697 arg2 = value_ptradd (arg1, 1);
2700 struct value *tmp = arg1;
2702 arg2 = value_one (value_type (arg1));
2703 binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2);
2704 arg2 = value_binop (tmp, arg2, BINOP_ADD);
2707 value_assign (arg1, arg2);
2711 case UNOP_POSTDECREMENT:
2712 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2713 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2715 else if (unop_user_defined_p (op, arg1))
2717 return value_x_unop (arg1, op, noside);
2721 arg3 = value_non_lval (arg1);
2723 if (ptrmath_type_p (exp->language_defn, value_type (arg1)))
2724 arg2 = value_ptradd (arg1, -1);
2727 struct value *tmp = arg1;
2729 arg2 = value_one (value_type (arg1));
2730 binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2);
2731 arg2 = value_binop (tmp, arg2, BINOP_SUB);
2734 value_assign (arg1, arg2);
2740 return value_of_this (exp->language_defn);
2743 /* The value is not supposed to be used. This is here to make it
2744 easier to accommodate expressions that contain types. */
2746 if (noside == EVAL_SKIP)
2748 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
2750 struct type *type = exp->elts[pc + 1].type;
2752 /* If this is a typedef, then find its immediate target. We
2753 use check_typedef to resolve stubs, but we ignore its
2754 result because we do not want to dig past all
2756 check_typedef (type);
2757 if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF)
2758 type = TYPE_TARGET_TYPE (type);
2759 return allocate_value (type);
2762 error (_("Attempt to use a type name as an expression"));
2766 if (noside == EVAL_SKIP)
2768 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
2771 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
2773 enum exp_opcode sub_op = exp->elts[*pos].opcode;
2774 struct value *result;
2776 result = evaluate_subexp (NULL_TYPE, exp, pos,
2777 EVAL_AVOID_SIDE_EFFECTS);
2779 /* 'decltype' has special semantics for lvalues. */
2780 if (op == OP_DECLTYPE
2781 && (sub_op == BINOP_SUBSCRIPT
2782 || sub_op == STRUCTOP_MEMBER
2783 || sub_op == STRUCTOP_MPTR
2784 || sub_op == UNOP_IND
2785 || sub_op == STRUCTOP_STRUCT
2786 || sub_op == STRUCTOP_PTR
2787 || sub_op == OP_SCOPE))
2789 struct type *type = value_type (result);
2791 if (TYPE_CODE (check_typedef (type)) != TYPE_CODE_REF)
2793 type = lookup_reference_type (type);
2794 result = allocate_value (type);
2801 error (_("Attempt to use a type as an expression"));
2805 struct value *result;
2806 enum exp_opcode sub_op = exp->elts[*pos].opcode;
2808 if (sub_op == OP_TYPE || sub_op == OP_DECLTYPE || sub_op == OP_TYPEOF)
2809 result = evaluate_subexp (NULL_TYPE, exp, pos,
2810 EVAL_AVOID_SIDE_EFFECTS);
2812 result = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2814 if (noside != EVAL_NORMAL)
2815 return allocate_value (cplus_typeid_type (exp->gdbarch));
2817 return cplus_typeid (result);
2821 /* Removing this case and compiling with gcc -Wall reveals that
2822 a lot of cases are hitting this case. Some of these should
2823 probably be removed from expression.h; others are legitimate
2824 expressions which are (apparently) not fully implemented.
2826 If there are any cases landing here which mean a user error,
2827 then they should be separate cases, with more descriptive
2830 error (_("GDB does not (yet) know how to "
2831 "evaluate that kind of expression"));
2835 return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
2838 /* Evaluate a subexpression of EXP, at index *POS,
2839 and return the address of that subexpression.
2840 Advance *POS over the subexpression.
2841 If the subexpression isn't an lvalue, get an error.
2842 NOSIDE may be EVAL_AVOID_SIDE_EFFECTS;
2843 then only the type of the result need be correct. */
2845 static struct value *
2846 evaluate_subexp_for_address (struct expression *exp, int *pos,
2856 op = exp->elts[pc].opcode;
2862 x = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2864 /* We can't optimize out "&*" if there's a user-defined operator*. */
2865 if (unop_user_defined_p (op, x))
2867 x = value_x_unop (x, op, noside);
2868 goto default_case_after_eval;
2871 return coerce_array (x);
2875 return value_cast (lookup_pointer_type (exp->elts[pc + 1].type),
2876 evaluate_subexp (NULL_TYPE, exp, pos, noside));
2878 case UNOP_MEMVAL_TYPE:
2883 x = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2884 type = value_type (x);
2885 return value_cast (lookup_pointer_type (type),
2886 evaluate_subexp (NULL_TYPE, exp, pos, noside));
2890 var = exp->elts[pc + 2].symbol;
2892 /* C++: The "address" of a reference should yield the address
2893 * of the object pointed to. Let value_addr() deal with it. */
2894 if (TYPE_CODE (SYMBOL_TYPE (var)) == TYPE_CODE_REF)
2898 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2901 lookup_pointer_type (SYMBOL_TYPE (var));
2902 enum address_class sym_class = SYMBOL_CLASS (var);
2904 if (sym_class == LOC_CONST
2905 || sym_class == LOC_CONST_BYTES
2906 || sym_class == LOC_REGISTER)
2907 error (_("Attempt to take address of register or constant."));
2910 value_zero (type, not_lval);
2913 return address_of_variable (var, exp->elts[pc + 1].block);
2916 tem = longest_to_int (exp->elts[pc + 2].longconst);
2917 (*pos) += 5 + BYTES_TO_EXP_ELEM (tem + 1);
2918 x = value_aggregate_elt (exp->elts[pc + 1].type,
2919 &exp->elts[pc + 3].string,
2922 error (_("There is no field named %s"), &exp->elts[pc + 3].string);
2927 x = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2928 default_case_after_eval:
2929 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2931 struct type *type = check_typedef (value_type (x));
2933 if (TYPE_CODE (type) == TYPE_CODE_REF)
2934 return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
2936 else if (VALUE_LVAL (x) == lval_memory || value_must_coerce_to_target (x))
2937 return value_zero (lookup_pointer_type (value_type (x)),
2940 error (_("Attempt to take address of "
2941 "value not located in memory."));
2943 return value_addr (x);
2947 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
2948 When used in contexts where arrays will be coerced anyway, this is
2949 equivalent to `evaluate_subexp' but much faster because it avoids
2950 actually fetching array contents (perhaps obsolete now that we have
2953 Note that we currently only do the coercion for C expressions, where
2954 arrays are zero based and the coercion is correct. For other languages,
2955 with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION
2956 to decide if coercion is appropriate. */
2959 evaluate_subexp_with_coercion (struct expression *exp,
2960 int *pos, enum noside noside)
2969 op = exp->elts[pc].opcode;
2974 var = exp->elts[pc + 2].symbol;
2975 type = check_typedef (SYMBOL_TYPE (var));
2976 if (TYPE_CODE (type) == TYPE_CODE_ARRAY
2977 && !TYPE_VECTOR (type)
2978 && CAST_IS_CONVERSION (exp->language_defn))
2981 val = address_of_variable (var, exp->elts[pc + 1].block);
2982 return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
2988 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
2992 /* Evaluate a subexpression of EXP, at index *POS,
2993 and return a value for the size of that subexpression.
2994 Advance *POS over the subexpression. If NOSIDE is EVAL_NORMAL
2995 we allow side-effects on the operand if its type is a variable
2998 static struct value *
2999 evaluate_subexp_for_sizeof (struct expression *exp, int *pos,
3002 /* FIXME: This should be size_t. */
3003 struct type *size_type = builtin_type (exp->gdbarch)->builtin_int;
3010 op = exp->elts[pc].opcode;
3014 /* This case is handled specially
3015 so that we avoid creating a value for the result type.
3016 If the result type is very big, it's desirable not to
3017 create a value unnecessarily. */
3020 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
3021 type = check_typedef (value_type (val));
3022 if (TYPE_CODE (type) != TYPE_CODE_PTR
3023 && TYPE_CODE (type) != TYPE_CODE_REF
3024 && TYPE_CODE (type) != TYPE_CODE_ARRAY)
3025 error (_("Attempt to take contents of a non-pointer value."));
3026 type = TYPE_TARGET_TYPE (type);
3027 if (is_dynamic_type (type))
3028 type = value_type (value_ind (val));
3029 return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
3033 type = exp->elts[pc + 1].type;
3036 case UNOP_MEMVAL_TYPE:
3038 val = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
3039 type = value_type (val);
3043 type = SYMBOL_TYPE (exp->elts[pc + 2].symbol);
3044 if (is_dynamic_type (type))
3046 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL);
3047 type = value_type (val);
3053 /* Deal with the special case if NOSIDE is EVAL_NORMAL and the resulting
3054 type of the subscript is a variable length array type. In this case we
3055 must re-evaluate the right hand side of the subcription to allow
3057 case BINOP_SUBSCRIPT:
3058 if (noside == EVAL_NORMAL)
3060 int pc = (*pos) + 1;
3062 val = evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
3063 type = check_typedef (value_type (val));
3064 if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
3066 type = check_typedef (TYPE_TARGET_TYPE (type));
3067 if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
3069 type = TYPE_INDEX_TYPE (type);
3070 /* Only re-evaluate the right hand side if the resulting type
3071 is a variable length type. */
3072 if (TYPE_RANGE_DATA (type)->flag_bound_evaluated)
3074 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL);
3075 return value_from_longest
3076 (size_type, (LONGEST) TYPE_LENGTH (value_type (val)));
3085 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
3086 type = value_type (val);
3090 /* $5.3.3/2 of the C++ Standard (n3290 draft) says of sizeof:
3091 "When applied to a reference or a reference type, the result is
3092 the size of the referenced type." */
3093 type = check_typedef (type);
3094 if (exp->language_defn->la_language == language_cplus
3095 && TYPE_CODE (type) == TYPE_CODE_REF)
3096 type = check_typedef (TYPE_TARGET_TYPE (type));
3097 return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
3100 /* Parse a type expression in the string [P..P+LENGTH). */
3103 parse_and_eval_type (char *p, int length)
3105 char *tmp = (char *) alloca (length + 4);
3106 struct expression *expr;
3109 memcpy (tmp + 1, p, length);
3110 tmp[length + 1] = ')';
3111 tmp[length + 2] = '0';
3112 tmp[length + 3] = '\0';
3113 expr = parse_expression (tmp);
3114 if (expr->elts[0].opcode != UNOP_CAST)
3115 error (_("Internal error in eval_type."));
3116 return expr->elts[1].type;
3120 calc_f77_array_dims (struct type *array_type)
3123 struct type *tmp_type;
3125 if ((TYPE_CODE (array_type) != TYPE_CODE_ARRAY))
3126 error (_("Can't get dimensions for a non-array type"));
3128 tmp_type = array_type;
3130 while ((tmp_type = TYPE_TARGET_TYPE (tmp_type)))
3132 if (TYPE_CODE (tmp_type) == TYPE_CODE_ARRAY)