1 /* Perform non-arithmetic 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/>. */
35 #include "dictionary.h"
36 #include "cp-support.h"
38 #include "tracepoint.h"
41 #include "extension.h"
42 #include "byte-vector.h"
44 extern unsigned int overload_debug;
45 /* Local functions. */
47 static int typecmp (int staticp, int varargs, int nargs,
48 struct field t1[], struct value *t2[]);
50 static struct value *search_struct_field (const char *, struct value *,
53 static struct value *search_struct_method (const char *, struct value **,
55 LONGEST, int *, struct type *);
57 static int find_oload_champ_namespace (struct value **, int,
58 const char *, const char *,
60 struct badness_vector **,
64 int find_oload_champ_namespace_loop (struct value **, int,
65 const char *, const char *,
66 int, struct symbol ***,
67 struct badness_vector **, int *,
70 static int find_oload_champ (struct value **, int, int,
71 struct fn_field *, VEC (xmethod_worker_ptr) *,
72 struct symbol **, struct badness_vector **);
74 static int oload_method_static_p (struct fn_field *, int);
76 enum oload_classification { STANDARD, NON_STANDARD, INCOMPATIBLE };
79 oload_classification classify_oload_match (struct badness_vector *,
82 static struct value *value_struct_elt_for_reference (struct type *,
88 static struct value *value_namespace_elt (const struct type *,
89 const char *, int , enum noside);
91 static struct value *value_maybe_namespace_elt (const struct type *,
95 static CORE_ADDR allocate_space_in_inferior (int);
97 static struct value *cast_into_complex (struct type *, struct value *);
99 static void find_method_list (struct value **, const char *,
100 LONGEST, struct type *, struct fn_field **, int *,
101 VEC (xmethod_worker_ptr) **,
102 struct type **, LONGEST *);
104 void _initialize_valops (void);
107 /* Flag for whether we want to abandon failed expression evals by
110 static int auto_abandon = 0;
113 int overload_resolution = 0;
115 show_overload_resolution (struct ui_file *file, int from_tty,
116 struct cmd_list_element *c,
119 fprintf_filtered (file, _("Overload resolution in evaluating "
120 "C++ functions is %s.\n"),
124 /* Find the address of function name NAME in the inferior. If OBJF_P
125 is non-NULL, *OBJF_P will be set to the OBJFILE where the function
129 find_function_in_inferior (const char *name, struct objfile **objf_p)
131 struct block_symbol sym;
133 sym = lookup_symbol (name, 0, VAR_DOMAIN, 0);
134 if (sym.symbol != NULL)
136 if (SYMBOL_CLASS (sym.symbol) != LOC_BLOCK)
138 error (_("\"%s\" exists in this program but is not a function."),
143 *objf_p = symbol_objfile (sym.symbol);
145 return value_of_variable (sym.symbol, sym.block);
149 struct bound_minimal_symbol msymbol =
150 lookup_bound_minimal_symbol (name);
152 if (msymbol.minsym != NULL)
154 struct objfile *objfile = msymbol.objfile;
155 struct gdbarch *gdbarch = get_objfile_arch (objfile);
159 type = lookup_pointer_type (builtin_type (gdbarch)->builtin_char);
160 type = lookup_function_type (type);
161 type = lookup_pointer_type (type);
162 maddr = BMSYMBOL_VALUE_ADDRESS (msymbol);
167 return value_from_pointer (type, maddr);
171 if (!target_has_execution)
172 error (_("evaluation of this expression "
173 "requires the target program to be active"));
175 error (_("evaluation of this expression requires the "
176 "program to have a function \"%s\"."),
182 /* Allocate NBYTES of space in the inferior using the inferior's
183 malloc and return a value that is a pointer to the allocated
187 value_allocate_space_in_inferior (int len)
189 struct objfile *objf;
190 struct value *val = find_function_in_inferior ("malloc", &objf);
191 struct gdbarch *gdbarch = get_objfile_arch (objf);
192 struct value *blocklen;
194 blocklen = value_from_longest (builtin_type (gdbarch)->builtin_int, len);
195 val = call_function_by_hand (val, 1, &blocklen);
196 if (value_logical_not (val))
198 if (!target_has_execution)
199 error (_("No memory available to program now: "
200 "you need to start the target first"));
202 error (_("No memory available to program: call to malloc failed"));
208 allocate_space_in_inferior (int len)
210 return value_as_long (value_allocate_space_in_inferior (len));
213 /* Cast struct value VAL to type TYPE and return as a value.
214 Both type and val must be of TYPE_CODE_STRUCT or TYPE_CODE_UNION
215 for this to work. Typedef to one of the codes is permitted.
216 Returns NULL if the cast is neither an upcast nor a downcast. */
218 static struct value *
219 value_cast_structs (struct type *type, struct value *v2)
225 gdb_assert (type != NULL && v2 != NULL);
227 t1 = check_typedef (type);
228 t2 = check_typedef (value_type (v2));
230 /* Check preconditions. */
231 gdb_assert ((TYPE_CODE (t1) == TYPE_CODE_STRUCT
232 || TYPE_CODE (t1) == TYPE_CODE_UNION)
233 && !!"Precondition is that type is of STRUCT or UNION kind.");
234 gdb_assert ((TYPE_CODE (t2) == TYPE_CODE_STRUCT
235 || TYPE_CODE (t2) == TYPE_CODE_UNION)
236 && !!"Precondition is that value is of STRUCT or UNION kind");
238 if (TYPE_NAME (t1) != NULL
239 && TYPE_NAME (t2) != NULL
240 && !strcmp (TYPE_NAME (t1), TYPE_NAME (t2)))
243 /* Upcasting: look in the type of the source to see if it contains the
244 type of the target as a superclass. If so, we'll need to
245 offset the pointer rather than just change its type. */
246 if (TYPE_NAME (t1) != NULL)
248 v = search_struct_field (type_name_no_tag (t1),
254 /* Downcasting: look in the type of the target to see if it contains the
255 type of the source as a superclass. If so, we'll need to
256 offset the pointer rather than just change its type. */
257 if (TYPE_NAME (t2) != NULL)
259 /* Try downcasting using the run-time type of the value. */
262 struct type *real_type;
264 real_type = value_rtti_type (v2, &full, &top, &using_enc);
267 v = value_full_object (v2, real_type, full, top, using_enc);
268 v = value_at_lazy (real_type, value_address (v));
269 real_type = value_type (v);
271 /* We might be trying to cast to the outermost enclosing
272 type, in which case search_struct_field won't work. */
273 if (TYPE_NAME (real_type) != NULL
274 && !strcmp (TYPE_NAME (real_type), TYPE_NAME (t1)))
277 v = search_struct_field (type_name_no_tag (t2), v, real_type, 1);
282 /* Try downcasting using information from the destination type
283 T2. This wouldn't work properly for classes with virtual
284 bases, but those were handled above. */
285 v = search_struct_field (type_name_no_tag (t2),
286 value_zero (t1, not_lval), t1, 1);
289 /* Downcasting is possible (t1 is superclass of v2). */
290 CORE_ADDR addr2 = value_address (v2);
292 addr2 -= value_address (v) + value_embedded_offset (v);
293 return value_at (type, addr2);
300 /* Cast one pointer or reference type to another. Both TYPE and
301 the type of ARG2 should be pointer types, or else both should be
302 reference types. If SUBCLASS_CHECK is non-zero, this will force a
303 check to see whether TYPE is a superclass of ARG2's type. If
304 SUBCLASS_CHECK is zero, then the subclass check is done only when
305 ARG2 is itself non-zero. Returns the new pointer or reference. */
308 value_cast_pointers (struct type *type, struct value *arg2,
311 struct type *type1 = check_typedef (type);
312 struct type *type2 = check_typedef (value_type (arg2));
313 struct type *t1 = check_typedef (TYPE_TARGET_TYPE (type1));
314 struct type *t2 = check_typedef (TYPE_TARGET_TYPE (type2));
316 if (TYPE_CODE (t1) == TYPE_CODE_STRUCT
317 && TYPE_CODE (t2) == TYPE_CODE_STRUCT
318 && (subclass_check || !value_logical_not (arg2)))
322 if (TYPE_IS_REFERENCE (type2))
323 v2 = coerce_ref (arg2);
325 v2 = value_ind (arg2);
326 gdb_assert (TYPE_CODE (check_typedef (value_type (v2)))
327 == TYPE_CODE_STRUCT && !!"Why did coercion fail?");
328 v2 = value_cast_structs (t1, v2);
329 /* At this point we have what we can have, un-dereference if needed. */
332 struct value *v = value_addr (v2);
334 deprecated_set_value_type (v, type);
339 /* No superclass found, just change the pointer type. */
340 arg2 = value_copy (arg2);
341 deprecated_set_value_type (arg2, type);
342 set_value_enclosing_type (arg2, type);
343 set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */
347 /* Cast value ARG2 to type TYPE and return as a value.
348 More general than a C cast: accepts any two types of the same length,
349 and if ARG2 is an lvalue it can be cast into anything at all. */
350 /* In C++, casts may change pointer or object representations. */
353 value_cast (struct type *type, struct value *arg2)
355 enum type_code code1;
356 enum type_code code2;
360 int convert_to_boolean = 0;
362 if (value_type (arg2) == type)
365 /* Check if we are casting struct reference to struct reference. */
366 if (TYPE_IS_REFERENCE (check_typedef (type)))
368 /* We dereference type; then we recurse and finally
369 we generate value of the given reference. Nothing wrong with
371 struct type *t1 = check_typedef (type);
372 struct type *dereftype = check_typedef (TYPE_TARGET_TYPE (t1));
373 struct value *val = value_cast (dereftype, arg2);
375 return value_ref (val, TYPE_CODE (t1));
378 if (TYPE_IS_REFERENCE (check_typedef (value_type (arg2))))
379 /* We deref the value and then do the cast. */
380 return value_cast (type, coerce_ref (arg2));
382 type = check_typedef (type);
383 code1 = TYPE_CODE (type);
384 arg2 = coerce_ref (arg2);
385 type2 = check_typedef (value_type (arg2));
387 /* You can't cast to a reference type. See value_cast_pointers
389 gdb_assert (!TYPE_IS_REFERENCE (type));
391 /* A cast to an undetermined-length array_type, such as
392 (TYPE [])OBJECT, is treated like a cast to (TYPE [N])OBJECT,
393 where N is sizeof(OBJECT)/sizeof(TYPE). */
394 if (code1 == TYPE_CODE_ARRAY)
396 struct type *element_type = TYPE_TARGET_TYPE (type);
397 unsigned element_length = TYPE_LENGTH (check_typedef (element_type));
399 if (element_length > 0 && TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))
401 struct type *range_type = TYPE_INDEX_TYPE (type);
402 int val_length = TYPE_LENGTH (type2);
403 LONGEST low_bound, high_bound, new_length;
405 if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
406 low_bound = 0, high_bound = 0;
407 new_length = val_length / element_length;
408 if (val_length % element_length != 0)
409 warning (_("array element type size does not "
410 "divide object size in cast"));
411 /* FIXME-type-allocation: need a way to free this type when
412 we are done with it. */
413 range_type = create_static_range_type ((struct type *) NULL,
414 TYPE_TARGET_TYPE (range_type),
416 new_length + low_bound - 1);
417 deprecated_set_value_type (arg2,
418 create_array_type ((struct type *) NULL,
425 if (current_language->c_style_arrays
426 && TYPE_CODE (type2) == TYPE_CODE_ARRAY
427 && !TYPE_VECTOR (type2))
428 arg2 = value_coerce_array (arg2);
430 if (TYPE_CODE (type2) == TYPE_CODE_FUNC)
431 arg2 = value_coerce_function (arg2);
433 type2 = check_typedef (value_type (arg2));
434 code2 = TYPE_CODE (type2);
436 if (code1 == TYPE_CODE_COMPLEX)
437 return cast_into_complex (type, arg2);
438 if (code1 == TYPE_CODE_BOOL)
440 code1 = TYPE_CODE_INT;
441 convert_to_boolean = 1;
443 if (code1 == TYPE_CODE_CHAR)
444 code1 = TYPE_CODE_INT;
445 if (code2 == TYPE_CODE_BOOL || code2 == TYPE_CODE_CHAR)
446 code2 = TYPE_CODE_INT;
448 scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT
449 || code2 == TYPE_CODE_DECFLOAT || code2 == TYPE_CODE_ENUM
450 || code2 == TYPE_CODE_RANGE);
452 if ((code1 == TYPE_CODE_STRUCT || code1 == TYPE_CODE_UNION)
453 && (code2 == TYPE_CODE_STRUCT || code2 == TYPE_CODE_UNION)
454 && TYPE_NAME (type) != 0)
456 struct value *v = value_cast_structs (type, arg2);
462 if (code1 == TYPE_CODE_FLT && scalar)
463 return value_from_double (type, value_as_double (arg2));
464 else if (code1 == TYPE_CODE_DECFLOAT && scalar)
466 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
467 int dec_len = TYPE_LENGTH (type);
470 if (code2 == TYPE_CODE_FLT)
471 decimal_from_floating (arg2, dec, dec_len, byte_order);
472 else if (code2 == TYPE_CODE_DECFLOAT)
473 decimal_convert (value_contents (arg2), TYPE_LENGTH (type2),
474 byte_order, dec, dec_len, byte_order);
476 /* The only option left is an integral type. */
477 decimal_from_integral (arg2, dec, dec_len, byte_order);
479 return value_from_decfloat (type, dec);
481 else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM
482 || code1 == TYPE_CODE_RANGE)
483 && (scalar || code2 == TYPE_CODE_PTR
484 || code2 == TYPE_CODE_MEMBERPTR))
488 /* When we cast pointers to integers, we mustn't use
489 gdbarch_pointer_to_address to find the address the pointer
490 represents, as value_as_long would. GDB should evaluate
491 expressions just as the compiler would --- and the compiler
492 sees a cast as a simple reinterpretation of the pointer's
494 if (code2 == TYPE_CODE_PTR)
495 longest = extract_unsigned_integer
496 (value_contents (arg2), TYPE_LENGTH (type2),
497 gdbarch_byte_order (get_type_arch (type2)));
499 longest = value_as_long (arg2);
500 return value_from_longest (type, convert_to_boolean ?
501 (LONGEST) (longest ? 1 : 0) : longest);
503 else if (code1 == TYPE_CODE_PTR && (code2 == TYPE_CODE_INT
504 || code2 == TYPE_CODE_ENUM
505 || code2 == TYPE_CODE_RANGE))
507 /* TYPE_LENGTH (type) is the length of a pointer, but we really
508 want the length of an address! -- we are really dealing with
509 addresses (i.e., gdb representations) not pointers (i.e.,
510 target representations) here.
512 This allows things like "print *(int *)0x01000234" to work
513 without printing a misleading message -- which would
514 otherwise occur when dealing with a target having two byte
515 pointers and four byte addresses. */
517 int addr_bit = gdbarch_addr_bit (get_type_arch (type2));
518 LONGEST longest = value_as_long (arg2);
520 if (addr_bit < sizeof (LONGEST) * HOST_CHAR_BIT)
522 if (longest >= ((LONGEST) 1 << addr_bit)
523 || longest <= -((LONGEST) 1 << addr_bit))
524 warning (_("value truncated"));
526 return value_from_longest (type, longest);
528 else if (code1 == TYPE_CODE_METHODPTR && code2 == TYPE_CODE_INT
529 && value_as_long (arg2) == 0)
531 struct value *result = allocate_value (type);
533 cplus_make_method_ptr (type, value_contents_writeable (result), 0, 0);
536 else if (code1 == TYPE_CODE_MEMBERPTR && code2 == TYPE_CODE_INT
537 && value_as_long (arg2) == 0)
539 /* The Itanium C++ ABI represents NULL pointers to members as
540 minus one, instead of biasing the normal case. */
541 return value_from_longest (type, -1);
543 else if (code1 == TYPE_CODE_ARRAY && TYPE_VECTOR (type)
544 && code2 == TYPE_CODE_ARRAY && TYPE_VECTOR (type2)
545 && TYPE_LENGTH (type) != TYPE_LENGTH (type2))
546 error (_("Cannot convert between vector values of different sizes"));
547 else if (code1 == TYPE_CODE_ARRAY && TYPE_VECTOR (type) && scalar
548 && TYPE_LENGTH (type) != TYPE_LENGTH (type2))
549 error (_("can only cast scalar to vector of same size"));
550 else if (code1 == TYPE_CODE_VOID)
552 return value_zero (type, not_lval);
554 else if (TYPE_LENGTH (type) == TYPE_LENGTH (type2))
556 if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
557 return value_cast_pointers (type, arg2, 0);
559 arg2 = value_copy (arg2);
560 deprecated_set_value_type (arg2, type);
561 set_value_enclosing_type (arg2, type);
562 set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */
565 else if (VALUE_LVAL (arg2) == lval_memory)
566 return value_at_lazy (type, value_address (arg2));
569 error (_("Invalid cast."));
574 /* The C++ reinterpret_cast operator. */
577 value_reinterpret_cast (struct type *type, struct value *arg)
579 struct value *result;
580 struct type *real_type = check_typedef (type);
581 struct type *arg_type, *dest_type;
583 enum type_code dest_code, arg_code;
585 /* Do reference, function, and array conversion. */
586 arg = coerce_array (arg);
588 /* Attempt to preserve the type the user asked for. */
591 /* If we are casting to a reference type, transform
592 reinterpret_cast<T&[&]>(V) to *reinterpret_cast<T*>(&V). */
593 if (TYPE_IS_REFERENCE (real_type))
596 arg = value_addr (arg);
597 dest_type = lookup_pointer_type (TYPE_TARGET_TYPE (dest_type));
598 real_type = lookup_pointer_type (real_type);
601 arg_type = value_type (arg);
603 dest_code = TYPE_CODE (real_type);
604 arg_code = TYPE_CODE (arg_type);
606 /* We can convert pointer types, or any pointer type to int, or int
608 if ((dest_code == TYPE_CODE_PTR && arg_code == TYPE_CODE_INT)
609 || (dest_code == TYPE_CODE_INT && arg_code == TYPE_CODE_PTR)
610 || (dest_code == TYPE_CODE_METHODPTR && arg_code == TYPE_CODE_INT)
611 || (dest_code == TYPE_CODE_INT && arg_code == TYPE_CODE_METHODPTR)
612 || (dest_code == TYPE_CODE_MEMBERPTR && arg_code == TYPE_CODE_INT)
613 || (dest_code == TYPE_CODE_INT && arg_code == TYPE_CODE_MEMBERPTR)
614 || (dest_code == arg_code
615 && (dest_code == TYPE_CODE_PTR
616 || dest_code == TYPE_CODE_METHODPTR
617 || dest_code == TYPE_CODE_MEMBERPTR)))
618 result = value_cast (dest_type, arg);
620 error (_("Invalid reinterpret_cast"));
623 result = value_cast (type, value_ref (value_ind (result),
629 /* A helper for value_dynamic_cast. This implements the first of two
630 runtime checks: we iterate over all the base classes of the value's
631 class which are equal to the desired class; if only one of these
632 holds the value, then it is the answer. */
635 dynamic_cast_check_1 (struct type *desired_type,
636 const gdb_byte *valaddr,
637 LONGEST embedded_offset,
640 struct type *search_type,
642 struct type *arg_type,
643 struct value **result)
645 int i, result_count = 0;
647 for (i = 0; i < TYPE_N_BASECLASSES (search_type) && result_count < 2; ++i)
649 LONGEST offset = baseclass_offset (search_type, i, valaddr,
653 if (class_types_same_p (desired_type, TYPE_BASECLASS (search_type, i)))
655 if (address + embedded_offset + offset >= arg_addr
656 && address + embedded_offset + offset < arg_addr + TYPE_LENGTH (arg_type))
660 *result = value_at_lazy (TYPE_BASECLASS (search_type, i),
661 address + embedded_offset + offset);
665 result_count += dynamic_cast_check_1 (desired_type,
667 embedded_offset + offset,
669 TYPE_BASECLASS (search_type, i),
678 /* A helper for value_dynamic_cast. This implements the second of two
679 runtime checks: we look for a unique public sibling class of the
680 argument's declared class. */
683 dynamic_cast_check_2 (struct type *desired_type,
684 const gdb_byte *valaddr,
685 LONGEST embedded_offset,
688 struct type *search_type,
689 struct value **result)
691 int i, result_count = 0;
693 for (i = 0; i < TYPE_N_BASECLASSES (search_type) && result_count < 2; ++i)
697 if (! BASETYPE_VIA_PUBLIC (search_type, i))
700 offset = baseclass_offset (search_type, i, valaddr, embedded_offset,
702 if (class_types_same_p (desired_type, TYPE_BASECLASS (search_type, i)))
706 *result = value_at_lazy (TYPE_BASECLASS (search_type, i),
707 address + embedded_offset + offset);
710 result_count += dynamic_cast_check_2 (desired_type,
712 embedded_offset + offset,
714 TYPE_BASECLASS (search_type, i),
721 /* The C++ dynamic_cast operator. */
724 value_dynamic_cast (struct type *type, struct value *arg)
728 struct type *resolved_type = check_typedef (type);
729 struct type *arg_type = check_typedef (value_type (arg));
730 struct type *class_type, *rtti_type;
731 struct value *result, *tem, *original_arg = arg;
733 int is_ref = TYPE_IS_REFERENCE (resolved_type);
735 if (TYPE_CODE (resolved_type) != TYPE_CODE_PTR
736 && !TYPE_IS_REFERENCE (resolved_type))
737 error (_("Argument to dynamic_cast must be a pointer or reference type"));
738 if (TYPE_CODE (TYPE_TARGET_TYPE (resolved_type)) != TYPE_CODE_VOID
739 && TYPE_CODE (TYPE_TARGET_TYPE (resolved_type)) != TYPE_CODE_STRUCT)
740 error (_("Argument to dynamic_cast must be pointer to class or `void *'"));
742 class_type = check_typedef (TYPE_TARGET_TYPE (resolved_type));
743 if (TYPE_CODE (resolved_type) == TYPE_CODE_PTR)
745 if (TYPE_CODE (arg_type) != TYPE_CODE_PTR
746 && ! (TYPE_CODE (arg_type) == TYPE_CODE_INT
747 && value_as_long (arg) == 0))
748 error (_("Argument to dynamic_cast does not have pointer type"));
749 if (TYPE_CODE (arg_type) == TYPE_CODE_PTR)
751 arg_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
752 if (TYPE_CODE (arg_type) != TYPE_CODE_STRUCT)
753 error (_("Argument to dynamic_cast does "
754 "not have pointer to class type"));
757 /* Handle NULL pointers. */
758 if (value_as_long (arg) == 0)
759 return value_zero (type, not_lval);
761 arg = value_ind (arg);
765 if (TYPE_CODE (arg_type) != TYPE_CODE_STRUCT)
766 error (_("Argument to dynamic_cast does not have class type"));
769 /* If the classes are the same, just return the argument. */
770 if (class_types_same_p (class_type, arg_type))
771 return value_cast (type, arg);
773 /* If the target type is a unique base class of the argument's
774 declared type, just cast it. */
775 if (is_ancestor (class_type, arg_type))
777 if (is_unique_ancestor (class_type, arg))
778 return value_cast (type, original_arg);
779 error (_("Ambiguous dynamic_cast"));
782 rtti_type = value_rtti_type (arg, &full, &top, &using_enc);
784 error (_("Couldn't determine value's most derived type for dynamic_cast"));
786 /* Compute the most derived object's address. */
787 addr = value_address (arg);
795 addr += top + value_embedded_offset (arg);
797 /* dynamic_cast<void *> means to return a pointer to the
798 most-derived object. */
799 if (TYPE_CODE (resolved_type) == TYPE_CODE_PTR
800 && TYPE_CODE (TYPE_TARGET_TYPE (resolved_type)) == TYPE_CODE_VOID)
801 return value_at_lazy (type, addr);
803 tem = value_at (type, addr);
804 type = value_type (tem);
806 /* The first dynamic check specified in 5.2.7. */
807 if (is_public_ancestor (arg_type, TYPE_TARGET_TYPE (resolved_type)))
809 if (class_types_same_p (rtti_type, TYPE_TARGET_TYPE (resolved_type)))
812 if (dynamic_cast_check_1 (TYPE_TARGET_TYPE (resolved_type),
813 value_contents_for_printing (tem),
814 value_embedded_offset (tem),
815 value_address (tem), tem,
819 return value_cast (type,
821 ? value_ref (result, TYPE_CODE (resolved_type))
822 : value_addr (result));
825 /* The second dynamic check specified in 5.2.7. */
827 if (is_public_ancestor (arg_type, rtti_type)
828 && dynamic_cast_check_2 (TYPE_TARGET_TYPE (resolved_type),
829 value_contents_for_printing (tem),
830 value_embedded_offset (tem),
831 value_address (tem), tem,
832 rtti_type, &result) == 1)
833 return value_cast (type,
835 ? value_ref (result, TYPE_CODE (resolved_type))
836 : value_addr (result));
838 if (TYPE_CODE (resolved_type) == TYPE_CODE_PTR)
839 return value_zero (type, not_lval);
841 error (_("dynamic_cast failed"));
844 /* Create a value of type TYPE that is zero, and return it. */
847 value_zero (struct type *type, enum lval_type lv)
849 struct value *val = allocate_value (type);
851 VALUE_LVAL (val) = (lv == lval_computed ? not_lval : lv);
855 /* Create a not_lval value of numeric type TYPE that is one, and return it. */
858 value_one (struct type *type)
860 struct type *type1 = check_typedef (type);
863 if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
865 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
868 decimal_from_string (v, TYPE_LENGTH (type), byte_order, "1");
869 val = value_from_decfloat (type, v);
871 else if (TYPE_CODE (type1) == TYPE_CODE_FLT)
873 val = value_from_double (type, (DOUBLEST) 1);
875 else if (is_integral_type (type1))
877 val = value_from_longest (type, (LONGEST) 1);
879 else if (TYPE_CODE (type1) == TYPE_CODE_ARRAY && TYPE_VECTOR (type1))
881 struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type1));
883 LONGEST low_bound, high_bound;
886 if (!get_array_bounds (type1, &low_bound, &high_bound))
887 error (_("Could not determine the vector bounds"));
889 val = allocate_value (type);
890 for (i = 0; i < high_bound - low_bound + 1; i++)
892 tmp = value_one (eltype);
893 memcpy (value_contents_writeable (val) + i * TYPE_LENGTH (eltype),
894 value_contents_all (tmp), TYPE_LENGTH (eltype));
899 error (_("Not a numeric type."));
902 /* value_one result is never used for assignments to. */
903 gdb_assert (VALUE_LVAL (val) == not_lval);
908 /* Helper function for value_at, value_at_lazy, and value_at_lazy_stack.
909 The type of the created value may differ from the passed type TYPE.
910 Make sure to retrieve the returned values's new type after this call
911 e.g. in case the type is a variable length array. */
913 static struct value *
914 get_value_at (struct type *type, CORE_ADDR addr, int lazy)
918 if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID)
919 error (_("Attempt to dereference a generic pointer."));
921 val = value_from_contents_and_address (type, NULL, addr);
924 value_fetch_lazy (val);
929 /* Return a value with type TYPE located at ADDR.
931 Call value_at only if the data needs to be fetched immediately;
932 if we can be 'lazy' and defer the fetch, perhaps indefinately, call
933 value_at_lazy instead. value_at_lazy simply records the address of
934 the data and sets the lazy-evaluation-required flag. The lazy flag
935 is tested in the value_contents macro, which is used if and when
936 the contents are actually required. The type of the created value
937 may differ from the passed type TYPE. Make sure to retrieve the
938 returned values's new type after this call e.g. in case the type
939 is a variable length array.
941 Note: value_at does *NOT* handle embedded offsets; perform such
942 adjustments before or after calling it. */
945 value_at (struct type *type, CORE_ADDR addr)
947 return get_value_at (type, addr, 0);
950 /* Return a lazy value with type TYPE located at ADDR (cf. value_at).
951 The type of the created value may differ from the passed type TYPE.
952 Make sure to retrieve the returned values's new type after this call
953 e.g. in case the type is a variable length array. */
956 value_at_lazy (struct type *type, CORE_ADDR addr)
958 return get_value_at (type, addr, 1);
962 read_value_memory (struct value *val, LONGEST bit_offset,
963 int stack, CORE_ADDR memaddr,
964 gdb_byte *buffer, size_t length)
966 ULONGEST xfered_total = 0;
967 struct gdbarch *arch = get_value_arch (val);
968 int unit_size = gdbarch_addressable_memory_unit_size (arch);
969 enum target_object object;
971 object = stack ? TARGET_OBJECT_STACK_MEMORY : TARGET_OBJECT_MEMORY;
973 while (xfered_total < length)
975 enum target_xfer_status status;
976 ULONGEST xfered_partial;
978 status = target_xfer_partial (current_target.beneath,
980 buffer + xfered_total * unit_size, NULL,
981 memaddr + xfered_total,
982 length - xfered_total,
985 if (status == TARGET_XFER_OK)
987 else if (status == TARGET_XFER_UNAVAILABLE)
988 mark_value_bits_unavailable (val, (xfered_total * HOST_CHAR_BIT
990 xfered_partial * HOST_CHAR_BIT);
991 else if (status == TARGET_XFER_EOF)
992 memory_error (TARGET_XFER_E_IO, memaddr + xfered_total);
994 memory_error (status, memaddr + xfered_total);
996 xfered_total += xfered_partial;
1001 /* Store the contents of FROMVAL into the location of TOVAL.
1002 Return a new value with the location of TOVAL and contents of FROMVAL. */
1005 value_assign (struct value *toval, struct value *fromval)
1009 struct frame_id old_frame;
1011 if (!deprecated_value_modifiable (toval))
1012 error (_("Left operand of assignment is not a modifiable lvalue."));
1014 toval = coerce_ref (toval);
1016 type = value_type (toval);
1017 if (VALUE_LVAL (toval) != lval_internalvar)
1018 fromval = value_cast (type, fromval);
1021 /* Coerce arrays and functions to pointers, except for arrays
1022 which only live in GDB's storage. */
1023 if (!value_must_coerce_to_target (fromval))
1024 fromval = coerce_array (fromval);
1027 type = check_typedef (type);
1029 /* Since modifying a register can trash the frame chain, and
1030 modifying memory can trash the frame cache, we save the old frame
1031 and then restore the new frame afterwards. */
1032 old_frame = get_frame_id (deprecated_safe_get_selected_frame ());
1034 switch (VALUE_LVAL (toval))
1036 case lval_internalvar:
1037 set_internalvar (VALUE_INTERNALVAR (toval), fromval);
1038 return value_of_internalvar (get_type_arch (type),
1039 VALUE_INTERNALVAR (toval));
1041 case lval_internalvar_component:
1043 LONGEST offset = value_offset (toval);
1045 /* Are we dealing with a bitfield?
1047 It is important to mention that `value_parent (toval)' is
1048 non-NULL iff `value_bitsize (toval)' is non-zero. */
1049 if (value_bitsize (toval))
1051 /* VALUE_INTERNALVAR below refers to the parent value, while
1052 the offset is relative to this parent value. */
1053 gdb_assert (value_parent (value_parent (toval)) == NULL);
1054 offset += value_offset (value_parent (toval));
1057 set_internalvar_component (VALUE_INTERNALVAR (toval),
1059 value_bitpos (toval),
1060 value_bitsize (toval),
1067 const gdb_byte *dest_buffer;
1068 CORE_ADDR changed_addr;
1070 gdb_byte buffer[sizeof (LONGEST)];
1072 if (value_bitsize (toval))
1074 struct value *parent = value_parent (toval);
1076 changed_addr = value_address (parent) + value_offset (toval);
1077 changed_len = (value_bitpos (toval)
1078 + value_bitsize (toval)
1079 + HOST_CHAR_BIT - 1)
1082 /* If we can read-modify-write exactly the size of the
1083 containing type (e.g. short or int) then do so. This
1084 is safer for volatile bitfields mapped to hardware
1086 if (changed_len < TYPE_LENGTH (type)
1087 && TYPE_LENGTH (type) <= (int) sizeof (LONGEST)
1088 && ((LONGEST) changed_addr % TYPE_LENGTH (type)) == 0)
1089 changed_len = TYPE_LENGTH (type);
1091 if (changed_len > (int) sizeof (LONGEST))
1092 error (_("Can't handle bitfields which "
1093 "don't fit in a %d bit word."),
1094 (int) sizeof (LONGEST) * HOST_CHAR_BIT);
1096 read_memory (changed_addr, buffer, changed_len);
1097 modify_field (type, buffer, value_as_long (fromval),
1098 value_bitpos (toval), value_bitsize (toval));
1099 dest_buffer = buffer;
1103 changed_addr = value_address (toval);
1104 changed_len = type_length_units (type);
1105 dest_buffer = value_contents (fromval);
1108 write_memory_with_notification (changed_addr, dest_buffer, changed_len);
1114 struct frame_info *frame;
1115 struct gdbarch *gdbarch;
1118 /* Figure out which frame this is in currently.
1120 We use VALUE_FRAME_ID for obtaining the value's frame id instead of
1121 VALUE_NEXT_FRAME_ID due to requiring a frame which may be passed to
1122 put_frame_register_bytes() below. That function will (eventually)
1123 perform the necessary unwind operation by first obtaining the next
1125 frame = frame_find_by_id (VALUE_FRAME_ID (toval));
1127 value_reg = VALUE_REGNUM (toval);
1130 error (_("Value being assigned to is no longer active."));
1132 gdbarch = get_frame_arch (frame);
1134 if (value_bitsize (toval))
1136 struct value *parent = value_parent (toval);
1137 LONGEST offset = value_offset (parent) + value_offset (toval);
1139 gdb_byte buffer[sizeof (LONGEST)];
1142 changed_len = (value_bitpos (toval)
1143 + value_bitsize (toval)
1144 + HOST_CHAR_BIT - 1)
1147 if (changed_len > (int) sizeof (LONGEST))
1148 error (_("Can't handle bitfields which "
1149 "don't fit in a %d bit word."),
1150 (int) sizeof (LONGEST) * HOST_CHAR_BIT);
1152 if (!get_frame_register_bytes (frame, value_reg, offset,
1153 changed_len, buffer,
1157 throw_error (OPTIMIZED_OUT_ERROR,
1158 _("value has been optimized out"));
1160 throw_error (NOT_AVAILABLE_ERROR,
1161 _("value is not available"));
1164 modify_field (type, buffer, value_as_long (fromval),
1165 value_bitpos (toval), value_bitsize (toval));
1167 put_frame_register_bytes (frame, value_reg, offset,
1168 changed_len, buffer);
1172 if (gdbarch_convert_register_p (gdbarch, VALUE_REGNUM (toval),
1175 /* If TOVAL is a special machine register requiring
1176 conversion of program values to a special raw
1178 gdbarch_value_to_register (gdbarch, frame,
1179 VALUE_REGNUM (toval), type,
1180 value_contents (fromval));
1184 put_frame_register_bytes (frame, value_reg,
1185 value_offset (toval),
1187 value_contents (fromval));
1191 observer_notify_register_changed (frame, value_reg);
1197 const struct lval_funcs *funcs = value_computed_funcs (toval);
1199 if (funcs->write != NULL)
1201 funcs->write (toval, fromval);
1208 error (_("Left operand of assignment is not an lvalue."));
1211 /* Assigning to the stack pointer, frame pointer, and other
1212 (architecture and calling convention specific) registers may
1213 cause the frame cache and regcache to be out of date. Assigning to memory
1214 also can. We just do this on all assignments to registers or
1215 memory, for simplicity's sake; I doubt the slowdown matters. */
1216 switch (VALUE_LVAL (toval))
1222 observer_notify_target_changed (¤t_target);
1224 /* Having destroyed the frame cache, restore the selected
1227 /* FIXME: cagney/2002-11-02: There has to be a better way of
1228 doing this. Instead of constantly saving/restoring the
1229 frame. Why not create a get_selected_frame() function that,
1230 having saved the selected frame's ID can automatically
1231 re-find the previously selected frame automatically. */
1234 struct frame_info *fi = frame_find_by_id (old_frame);
1245 /* If the field does not entirely fill a LONGEST, then zero the sign
1246 bits. If the field is signed, and is negative, then sign
1248 if ((value_bitsize (toval) > 0)
1249 && (value_bitsize (toval) < 8 * (int) sizeof (LONGEST)))
1251 LONGEST fieldval = value_as_long (fromval);
1252 LONGEST valmask = (((ULONGEST) 1) << value_bitsize (toval)) - 1;
1254 fieldval &= valmask;
1255 if (!TYPE_UNSIGNED (type)
1256 && (fieldval & (valmask ^ (valmask >> 1))))
1257 fieldval |= ~valmask;
1259 fromval = value_from_longest (type, fieldval);
1262 /* The return value is a copy of TOVAL so it shares its location
1263 information, but its contents are updated from FROMVAL. This
1264 implies the returned value is not lazy, even if TOVAL was. */
1265 val = value_copy (toval);
1266 set_value_lazy (val, 0);
1267 memcpy (value_contents_raw (val), value_contents (fromval),
1268 TYPE_LENGTH (type));
1270 /* We copy over the enclosing type and pointed-to offset from FROMVAL
1271 in the case of pointer types. For object types, the enclosing type
1272 and embedded offset must *not* be copied: the target object refered
1273 to by TOVAL retains its original dynamic type after assignment. */
1274 if (TYPE_CODE (type) == TYPE_CODE_PTR)
1276 set_value_enclosing_type (val, value_enclosing_type (fromval));
1277 set_value_pointed_to_offset (val, value_pointed_to_offset (fromval));
1283 /* Extend a value VAL to COUNT repetitions of its type. */
1286 value_repeat (struct value *arg1, int count)
1290 if (VALUE_LVAL (arg1) != lval_memory)
1291 error (_("Only values in memory can be extended with '@'."));
1293 error (_("Invalid number %d of repetitions."), count);
1295 val = allocate_repeat_value (value_enclosing_type (arg1), count);
1297 VALUE_LVAL (val) = lval_memory;
1298 set_value_address (val, value_address (arg1));
1300 read_value_memory (val, 0, value_stack (val), value_address (val),
1301 value_contents_all_raw (val),
1302 type_length_units (value_enclosing_type (val)));
1308 value_of_variable (struct symbol *var, const struct block *b)
1310 struct frame_info *frame = NULL;
1312 if (symbol_read_needs_frame (var))
1313 frame = get_selected_frame (_("No frame selected."));
1315 return read_var_value (var, b, frame);
1319 address_of_variable (struct symbol *var, const struct block *b)
1321 struct type *type = SYMBOL_TYPE (var);
1324 /* Evaluate it first; if the result is a memory address, we're fine.
1325 Lazy evaluation pays off here. */
1327 val = value_of_variable (var, b);
1328 type = value_type (val);
1330 if ((VALUE_LVAL (val) == lval_memory && value_lazy (val))
1331 || TYPE_CODE (type) == TYPE_CODE_FUNC)
1333 CORE_ADDR addr = value_address (val);
1335 return value_from_pointer (lookup_pointer_type (type), addr);
1338 /* Not a memory address; check what the problem was. */
1339 switch (VALUE_LVAL (val))
1343 struct frame_info *frame;
1344 const char *regname;
1346 frame = frame_find_by_id (VALUE_NEXT_FRAME_ID (val));
1349 regname = gdbarch_register_name (get_frame_arch (frame),
1350 VALUE_REGNUM (val));
1351 gdb_assert (regname && *regname);
1353 error (_("Address requested for identifier "
1354 "\"%s\" which is in register $%s"),
1355 SYMBOL_PRINT_NAME (var), regname);
1360 error (_("Can't take address of \"%s\" which isn't an lvalue."),
1361 SYMBOL_PRINT_NAME (var));
1368 /* Return one if VAL does not live in target memory, but should in order
1369 to operate on it. Otherwise return zero. */
1372 value_must_coerce_to_target (struct value *val)
1374 struct type *valtype;
1376 /* The only lval kinds which do not live in target memory. */
1377 if (VALUE_LVAL (val) != not_lval
1378 && VALUE_LVAL (val) != lval_internalvar
1379 && VALUE_LVAL (val) != lval_xcallable)
1382 valtype = check_typedef (value_type (val));
1384 switch (TYPE_CODE (valtype))
1386 case TYPE_CODE_ARRAY:
1387 return TYPE_VECTOR (valtype) ? 0 : 1;
1388 case TYPE_CODE_STRING:
1395 /* Make sure that VAL lives in target memory if it's supposed to. For
1396 instance, strings are constructed as character arrays in GDB's
1397 storage, and this function copies them to the target. */
1400 value_coerce_to_target (struct value *val)
1405 if (!value_must_coerce_to_target (val))
1408 length = TYPE_LENGTH (check_typedef (value_type (val)));
1409 addr = allocate_space_in_inferior (length);
1410 write_memory (addr, value_contents (val), length);
1411 return value_at_lazy (value_type (val), addr);
1414 /* Given a value which is an array, return a value which is a pointer
1415 to its first element, regardless of whether or not the array has a
1416 nonzero lower bound.
1418 FIXME: A previous comment here indicated that this routine should
1419 be substracting the array's lower bound. It's not clear to me that
1420 this is correct. Given an array subscripting operation, it would
1421 certainly work to do the adjustment here, essentially computing:
1423 (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0])
1425 However I believe a more appropriate and logical place to account
1426 for the lower bound is to do so in value_subscript, essentially
1429 (&array[0] + ((index - lowerbound) * sizeof array[0]))
1431 As further evidence consider what would happen with operations
1432 other than array subscripting, where the caller would get back a
1433 value that had an address somewhere before the actual first element
1434 of the array, and the information about the lower bound would be
1435 lost because of the coercion to pointer type. */
1438 value_coerce_array (struct value *arg1)
1440 struct type *type = check_typedef (value_type (arg1));
1442 /* If the user tries to do something requiring a pointer with an
1443 array that has not yet been pushed to the target, then this would
1444 be a good time to do so. */
1445 arg1 = value_coerce_to_target (arg1);
1447 if (VALUE_LVAL (arg1) != lval_memory)
1448 error (_("Attempt to take address of value not located in memory."));
1450 return value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
1451 value_address (arg1));
1454 /* Given a value which is a function, return a value which is a pointer
1458 value_coerce_function (struct value *arg1)
1460 struct value *retval;
1462 if (VALUE_LVAL (arg1) != lval_memory)
1463 error (_("Attempt to take address of value not located in memory."));
1465 retval = value_from_pointer (lookup_pointer_type (value_type (arg1)),
1466 value_address (arg1));
1470 /* Return a pointer value for the object for which ARG1 is the
1474 value_addr (struct value *arg1)
1477 struct type *type = check_typedef (value_type (arg1));
1479 if (TYPE_IS_REFERENCE (type))
1481 if (value_bits_synthetic_pointer (arg1, value_embedded_offset (arg1),
1482 TARGET_CHAR_BIT * TYPE_LENGTH (type)))
1483 arg1 = coerce_ref (arg1);
1486 /* Copy the value, but change the type from (T&) to (T*). We
1487 keep the same location information, which is efficient, and
1488 allows &(&X) to get the location containing the reference.
1489 Do the same to its enclosing type for consistency. */
1490 struct type *type_ptr
1491 = lookup_pointer_type (TYPE_TARGET_TYPE (type));
1492 struct type *enclosing_type
1493 = check_typedef (value_enclosing_type (arg1));
1494 struct type *enclosing_type_ptr
1495 = lookup_pointer_type (TYPE_TARGET_TYPE (enclosing_type));
1497 arg2 = value_copy (arg1);
1498 deprecated_set_value_type (arg2, type_ptr);
1499 set_value_enclosing_type (arg2, enclosing_type_ptr);
1504 if (TYPE_CODE (type) == TYPE_CODE_FUNC)
1505 return value_coerce_function (arg1);
1507 /* If this is an array that has not yet been pushed to the target,
1508 then this would be a good time to force it to memory. */
1509 arg1 = value_coerce_to_target (arg1);
1511 if (VALUE_LVAL (arg1) != lval_memory)
1512 error (_("Attempt to take address of value not located in memory."));
1514 /* Get target memory address. */
1515 arg2 = value_from_pointer (lookup_pointer_type (value_type (arg1)),
1516 (value_address (arg1)
1517 + value_embedded_offset (arg1)));
1519 /* This may be a pointer to a base subobject; so remember the
1520 full derived object's type ... */
1521 set_value_enclosing_type (arg2,
1522 lookup_pointer_type (value_enclosing_type (arg1)));
1523 /* ... and also the relative position of the subobject in the full
1525 set_value_pointed_to_offset (arg2, value_embedded_offset (arg1));
1529 /* Return a reference value for the object for which ARG1 is the
1533 value_ref (struct value *arg1, enum type_code refcode)
1536 struct type *type = check_typedef (value_type (arg1));
1538 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
1540 if ((TYPE_CODE (type) == TYPE_CODE_REF
1541 || TYPE_CODE (type) == TYPE_CODE_RVALUE_REF)
1542 && TYPE_CODE (type) == refcode)
1545 arg2 = value_addr (arg1);
1546 deprecated_set_value_type (arg2, lookup_reference_type (type, refcode));
1550 /* Given a value of a pointer type, apply the C unary * operator to
1554 value_ind (struct value *arg1)
1556 struct type *base_type;
1559 arg1 = coerce_array (arg1);
1561 base_type = check_typedef (value_type (arg1));
1563 if (VALUE_LVAL (arg1) == lval_computed)
1565 const struct lval_funcs *funcs = value_computed_funcs (arg1);
1567 if (funcs->indirect)
1569 struct value *result = funcs->indirect (arg1);
1576 if (TYPE_CODE (base_type) == TYPE_CODE_PTR)
1578 struct type *enc_type;
1580 /* We may be pointing to something embedded in a larger object.
1581 Get the real type of the enclosing object. */
1582 enc_type = check_typedef (value_enclosing_type (arg1));
1583 enc_type = TYPE_TARGET_TYPE (enc_type);
1585 if (TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_FUNC
1586 || TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_METHOD)
1587 /* For functions, go through find_function_addr, which knows
1588 how to handle function descriptors. */
1589 arg2 = value_at_lazy (enc_type,
1590 find_function_addr (arg1, NULL));
1592 /* Retrieve the enclosing object pointed to. */
1593 arg2 = value_at_lazy (enc_type,
1594 (value_as_address (arg1)
1595 - value_pointed_to_offset (arg1)));
1597 enc_type = value_type (arg2);
1598 return readjust_indirect_value_type (arg2, enc_type, base_type, arg1);
1601 error (_("Attempt to take contents of a non-pointer value."));
1602 return 0; /* For lint -- never reached. */
1605 /* Create a value for an array by allocating space in GDB, copying the
1606 data into that space, and then setting up an array value.
1608 The array bounds are set from LOWBOUND and HIGHBOUND, and the array
1609 is populated from the values passed in ELEMVEC.
1611 The element type of the array is inherited from the type of the
1612 first element, and all elements must have the same size (though we
1613 don't currently enforce any restriction on their types). */
1616 value_array (int lowbound, int highbound, struct value **elemvec)
1620 ULONGEST typelength;
1622 struct type *arraytype;
1624 /* Validate that the bounds are reasonable and that each of the
1625 elements have the same size. */
1627 nelem = highbound - lowbound + 1;
1630 error (_("bad array bounds (%d, %d)"), lowbound, highbound);
1632 typelength = type_length_units (value_enclosing_type (elemvec[0]));
1633 for (idx = 1; idx < nelem; idx++)
1635 if (type_length_units (value_enclosing_type (elemvec[idx]))
1638 error (_("array elements must all be the same size"));
1642 arraytype = lookup_array_range_type (value_enclosing_type (elemvec[0]),
1643 lowbound, highbound);
1645 if (!current_language->c_style_arrays)
1647 val = allocate_value (arraytype);
1648 for (idx = 0; idx < nelem; idx++)
1649 value_contents_copy (val, idx * typelength, elemvec[idx], 0,
1654 /* Allocate space to store the array, and then initialize it by
1655 copying in each element. */
1657 val = allocate_value (arraytype);
1658 for (idx = 0; idx < nelem; idx++)
1659 value_contents_copy (val, idx * typelength, elemvec[idx], 0, typelength);
1664 value_cstring (const char *ptr, ssize_t len, struct type *char_type)
1667 int lowbound = current_language->string_lower_bound;
1668 ssize_t highbound = len / TYPE_LENGTH (char_type);
1669 struct type *stringtype
1670 = lookup_array_range_type (char_type, lowbound, highbound + lowbound - 1);
1672 val = allocate_value (stringtype);
1673 memcpy (value_contents_raw (val), ptr, len);
1677 /* Create a value for a string constant by allocating space in the
1678 inferior, copying the data into that space, and returning the
1679 address with type TYPE_CODE_STRING. PTR points to the string
1680 constant data; LEN is number of characters.
1682 Note that string types are like array of char types with a lower
1683 bound of zero and an upper bound of LEN - 1. Also note that the
1684 string may contain embedded null bytes. */
1687 value_string (const char *ptr, ssize_t len, struct type *char_type)
1690 int lowbound = current_language->string_lower_bound;
1691 ssize_t highbound = len / TYPE_LENGTH (char_type);
1692 struct type *stringtype
1693 = lookup_string_range_type (char_type, lowbound, highbound + lowbound - 1);
1695 val = allocate_value (stringtype);
1696 memcpy (value_contents_raw (val), ptr, len);
1701 /* See if we can pass arguments in T2 to a function which takes
1702 arguments of types T1. T1 is a list of NARGS arguments, and T2 is
1703 a NULL-terminated vector. If some arguments need coercion of some
1704 sort, then the coerced values are written into T2. Return value is
1705 0 if the arguments could be matched, or the position at which they
1708 STATICP is nonzero if the T1 argument list came from a static
1709 member function. T2 will still include the ``this'' pointer, but
1712 For non-static member functions, we ignore the first argument,
1713 which is the type of the instance variable. This is because we
1714 want to handle calls with objects from derived classes. This is
1715 not entirely correct: we should actually check to make sure that a
1716 requested operation is type secure, shouldn't we? FIXME. */
1719 typecmp (int staticp, int varargs, int nargs,
1720 struct field t1[], struct value *t2[])
1725 internal_error (__FILE__, __LINE__,
1726 _("typecmp: no argument list"));
1728 /* Skip ``this'' argument if applicable. T2 will always include
1734 (i < nargs) && TYPE_CODE (t1[i].type) != TYPE_CODE_VOID;
1737 struct type *tt1, *tt2;
1742 tt1 = check_typedef (t1[i].type);
1743 tt2 = check_typedef (value_type (t2[i]));
1745 if (TYPE_IS_REFERENCE (tt1)
1746 /* We should be doing hairy argument matching, as below. */
1747 && (TYPE_CODE (check_typedef (TYPE_TARGET_TYPE (tt1)))
1748 == TYPE_CODE (tt2)))
1750 if (TYPE_CODE (tt2) == TYPE_CODE_ARRAY)
1751 t2[i] = value_coerce_array (t2[i]);
1753 t2[i] = value_ref (t2[i], TYPE_CODE (tt1));
1757 /* djb - 20000715 - Until the new type structure is in the
1758 place, and we can attempt things like implicit conversions,
1759 we need to do this so you can take something like a map<const
1760 char *>, and properly access map["hello"], because the
1761 argument to [] will be a reference to a pointer to a char,
1762 and the argument will be a pointer to a char. */
1763 while (TYPE_IS_REFERENCE (tt1) || TYPE_CODE (tt1) == TYPE_CODE_PTR)
1765 tt1 = check_typedef( TYPE_TARGET_TYPE(tt1) );
1767 while (TYPE_CODE(tt2) == TYPE_CODE_ARRAY
1768 || TYPE_CODE(tt2) == TYPE_CODE_PTR
1769 || TYPE_IS_REFERENCE (tt2))
1771 tt2 = check_typedef (TYPE_TARGET_TYPE(tt2));
1773 if (TYPE_CODE (tt1) == TYPE_CODE (tt2))
1775 /* Array to pointer is a `trivial conversion' according to the
1778 /* We should be doing much hairier argument matching (see
1779 section 13.2 of the ARM), but as a quick kludge, just check
1780 for the same type code. */
1781 if (TYPE_CODE (t1[i].type) != TYPE_CODE (value_type (t2[i])))
1784 if (varargs || t2[i] == NULL)
1789 /* Helper class for do_search_struct_field that updates *RESULT_PTR
1790 and *LAST_BOFFSET, and possibly throws an exception if the field
1791 search has yielded ambiguous results. */
1794 update_search_result (struct value **result_ptr, struct value *v,
1795 LONGEST *last_boffset, LONGEST boffset,
1796 const char *name, struct type *type)
1800 if (*result_ptr != NULL
1801 /* The result is not ambiguous if all the classes that are
1802 found occupy the same space. */
1803 && *last_boffset != boffset)
1804 error (_("base class '%s' is ambiguous in type '%s'"),
1805 name, TYPE_SAFE_NAME (type));
1807 *last_boffset = boffset;
1811 /* A helper for search_struct_field. This does all the work; most
1812 arguments are as passed to search_struct_field. The result is
1813 stored in *RESULT_PTR, which must be initialized to NULL.
1814 OUTERMOST_TYPE is the type of the initial type passed to
1815 search_struct_field; this is used for error reporting when the
1816 lookup is ambiguous. */
1819 do_search_struct_field (const char *name, struct value *arg1, LONGEST offset,
1820 struct type *type, int looking_for_baseclass,
1821 struct value **result_ptr,
1822 LONGEST *last_boffset,
1823 struct type *outermost_type)
1828 type = check_typedef (type);
1829 nbases = TYPE_N_BASECLASSES (type);
1831 if (!looking_for_baseclass)
1832 for (i = TYPE_NFIELDS (type) - 1; i >= nbases; i--)
1834 const char *t_field_name = TYPE_FIELD_NAME (type, i);
1836 if (t_field_name && (strcmp_iw (t_field_name, name) == 0))
1840 if (field_is_static (&TYPE_FIELD (type, i)))
1841 v = value_static_field (type, i);
1843 v = value_primitive_field (arg1, offset, i, type);
1849 && t_field_name[0] == '\0')
1851 struct type *field_type = TYPE_FIELD_TYPE (type, i);
1853 if (TYPE_CODE (field_type) == TYPE_CODE_UNION
1854 || TYPE_CODE (field_type) == TYPE_CODE_STRUCT)
1856 /* Look for a match through the fields of an anonymous
1857 union, or anonymous struct. C++ provides anonymous
1860 In the GNU Chill (now deleted from GDB)
1861 implementation of variant record types, each
1862 <alternative field> has an (anonymous) union type,
1863 each member of the union represents a <variant
1864 alternative>. Each <variant alternative> is
1865 represented as a struct, with a member for each
1868 struct value *v = NULL;
1869 LONGEST new_offset = offset;
1871 /* This is pretty gross. In G++, the offset in an
1872 anonymous union is relative to the beginning of the
1873 enclosing struct. In the GNU Chill (now deleted
1874 from GDB) implementation of variant records, the
1875 bitpos is zero in an anonymous union field, so we
1876 have to add the offset of the union here. */
1877 if (TYPE_CODE (field_type) == TYPE_CODE_STRUCT
1878 || (TYPE_NFIELDS (field_type) > 0
1879 && TYPE_FIELD_BITPOS (field_type, 0) == 0))
1880 new_offset += TYPE_FIELD_BITPOS (type, i) / 8;
1882 do_search_struct_field (name, arg1, new_offset,
1884 looking_for_baseclass, &v,
1896 for (i = 0; i < nbases; i++)
1898 struct value *v = NULL;
1899 struct type *basetype = check_typedef (TYPE_BASECLASS (type, i));
1900 /* If we are looking for baseclasses, this is what we get when
1901 we hit them. But it could happen that the base part's member
1902 name is not yet filled in. */
1903 int found_baseclass = (looking_for_baseclass
1904 && TYPE_BASECLASS_NAME (type, i) != NULL
1905 && (strcmp_iw (name,
1906 TYPE_BASECLASS_NAME (type,
1908 LONGEST boffset = value_embedded_offset (arg1) + offset;
1910 if (BASETYPE_VIA_VIRTUAL (type, i))
1914 boffset = baseclass_offset (type, i,
1915 value_contents_for_printing (arg1),
1916 value_embedded_offset (arg1) + offset,
1917 value_address (arg1),
1920 /* The virtual base class pointer might have been clobbered
1921 by the user program. Make sure that it still points to a
1922 valid memory location. */
1924 boffset += value_embedded_offset (arg1) + offset;
1926 || boffset >= TYPE_LENGTH (value_enclosing_type (arg1)))
1928 CORE_ADDR base_addr;
1930 base_addr = value_address (arg1) + boffset;
1931 v2 = value_at_lazy (basetype, base_addr);
1932 if (target_read_memory (base_addr,
1933 value_contents_raw (v2),
1934 TYPE_LENGTH (value_type (v2))) != 0)
1935 error (_("virtual baseclass botch"));
1939 v2 = value_copy (arg1);
1940 deprecated_set_value_type (v2, basetype);
1941 set_value_embedded_offset (v2, boffset);
1944 if (found_baseclass)
1948 do_search_struct_field (name, v2, 0,
1949 TYPE_BASECLASS (type, i),
1950 looking_for_baseclass,
1951 result_ptr, last_boffset,
1955 else if (found_baseclass)
1956 v = value_primitive_field (arg1, offset, i, type);
1959 do_search_struct_field (name, arg1,
1960 offset + TYPE_BASECLASS_BITPOS (type,
1962 basetype, looking_for_baseclass,
1963 result_ptr, last_boffset,
1967 update_search_result (result_ptr, v, last_boffset,
1968 boffset, name, outermost_type);
1972 /* Helper function used by value_struct_elt to recurse through
1973 baseclasses. Look for a field NAME in ARG1. Search in it assuming
1974 it has (class) type TYPE. If found, return value, else return NULL.
1976 If LOOKING_FOR_BASECLASS, then instead of looking for struct
1977 fields, look for a baseclass named NAME. */
1979 static struct value *
1980 search_struct_field (const char *name, struct value *arg1,
1981 struct type *type, int looking_for_baseclass)
1983 struct value *result = NULL;
1984 LONGEST boffset = 0;
1986 do_search_struct_field (name, arg1, 0, type, looking_for_baseclass,
1987 &result, &boffset, type);
1991 /* Helper function used by value_struct_elt to recurse through
1992 baseclasses. Look for a field NAME in ARG1. Adjust the address of
1993 ARG1 by OFFSET bytes, and search in it assuming it has (class) type
1996 If found, return value, else if name matched and args not return
1997 (value) -1, else return NULL. */
1999 static struct value *
2000 search_struct_method (const char *name, struct value **arg1p,
2001 struct value **args, LONGEST offset,
2002 int *static_memfuncp, struct type *type)
2006 int name_matched = 0;
2007 char dem_opname[64];
2009 type = check_typedef (type);
2010 for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--)
2012 const char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i);
2014 /* FIXME! May need to check for ARM demangling here. */
2015 if (startswith (t_field_name, "__") ||
2016 startswith (t_field_name, "op") ||
2017 startswith (t_field_name, "type"))
2019 if (cplus_demangle_opname (t_field_name, dem_opname, DMGL_ANSI))
2020 t_field_name = dem_opname;
2021 else if (cplus_demangle_opname (t_field_name, dem_opname, 0))
2022 t_field_name = dem_opname;
2024 if (t_field_name && (strcmp_iw (t_field_name, name) == 0))
2026 int j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1;
2027 struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i);
2030 check_stub_method_group (type, i);
2031 if (j > 0 && args == 0)
2032 error (_("cannot resolve overloaded method "
2033 "`%s': no arguments supplied"), name);
2034 else if (j == 0 && args == 0)
2036 v = value_fn_field (arg1p, f, j, type, offset);
2043 if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j),
2044 TYPE_VARARGS (TYPE_FN_FIELD_TYPE (f, j)),
2045 TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (f, j)),
2046 TYPE_FN_FIELD_ARGS (f, j), args))
2048 if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
2049 return value_virtual_fn_field (arg1p, f, j,
2051 if (TYPE_FN_FIELD_STATIC_P (f, j)
2053 *static_memfuncp = 1;
2054 v = value_fn_field (arg1p, f, j, type, offset);
2063 for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
2065 LONGEST base_offset;
2066 LONGEST this_offset;
2068 if (BASETYPE_VIA_VIRTUAL (type, i))
2070 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
2071 struct value *base_val;
2072 const gdb_byte *base_valaddr;
2074 /* The virtual base class pointer might have been
2075 clobbered by the user program. Make sure that it
2076 still points to a valid memory location. */
2078 if (offset < 0 || offset >= TYPE_LENGTH (type))
2082 gdb::byte_vector tmp (TYPE_LENGTH (baseclass));
2083 address = value_address (*arg1p);
2085 if (target_read_memory (address + offset,
2086 tmp.data (), TYPE_LENGTH (baseclass)) != 0)
2087 error (_("virtual baseclass botch"));
2089 base_val = value_from_contents_and_address (baseclass,
2092 base_valaddr = value_contents_for_printing (base_val);
2098 base_valaddr = value_contents_for_printing (*arg1p);
2099 this_offset = offset;
2102 base_offset = baseclass_offset (type, i, base_valaddr,
2103 this_offset, value_address (base_val),
2108 base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8;
2110 v = search_struct_method (name, arg1p, args, base_offset + offset,
2111 static_memfuncp, TYPE_BASECLASS (type, i));
2112 if (v == (struct value *) - 1)
2118 /* FIXME-bothner: Why is this commented out? Why is it here? */
2119 /* *arg1p = arg1_tmp; */
2124 return (struct value *) - 1;
2129 /* Given *ARGP, a value of type (pointer to a)* structure/union,
2130 extract the component named NAME from the ultimate target
2131 structure/union and return it as a value with its appropriate type.
2132 ERR is used in the error message if *ARGP's type is wrong.
2134 C++: ARGS is a list of argument types to aid in the selection of
2135 an appropriate method. Also, handle derived types.
2137 STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location
2138 where the truthvalue of whether the function that was resolved was
2139 a static member function or not is stored.
2141 ERR is an error message to be printed in case the field is not
2145 value_struct_elt (struct value **argp, struct value **args,
2146 const char *name, int *static_memfuncp, const char *err)
2151 *argp = coerce_array (*argp);
2153 t = check_typedef (value_type (*argp));
2155 /* Follow pointers until we get to a non-pointer. */
2157 while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (t))
2159 *argp = value_ind (*argp);
2160 /* Don't coerce fn pointer to fn and then back again! */
2161 if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
2162 *argp = coerce_array (*argp);
2163 t = check_typedef (value_type (*argp));
2166 if (TYPE_CODE (t) != TYPE_CODE_STRUCT
2167 && TYPE_CODE (t) != TYPE_CODE_UNION)
2168 error (_("Attempt to extract a component of a value that is not a %s."),
2171 /* Assume it's not, unless we see that it is. */
2172 if (static_memfuncp)
2173 *static_memfuncp = 0;
2177 /* if there are no arguments ...do this... */
2179 /* Try as a field first, because if we succeed, there is less
2181 v = search_struct_field (name, *argp, t, 0);
2185 /* C++: If it was not found as a data field, then try to
2186 return it as a pointer to a method. */
2187 v = search_struct_method (name, argp, args, 0,
2188 static_memfuncp, t);
2190 if (v == (struct value *) - 1)
2191 error (_("Cannot take address of method %s."), name);
2194 if (TYPE_NFN_FIELDS (t))
2195 error (_("There is no member or method named %s."), name);
2197 error (_("There is no member named %s."), name);
2202 v = search_struct_method (name, argp, args, 0,
2203 static_memfuncp, t);
2205 if (v == (struct value *) - 1)
2207 error (_("One of the arguments you tried to pass to %s could not "
2208 "be converted to what the function wants."), name);
2212 /* See if user tried to invoke data as function. If so, hand it
2213 back. If it's not callable (i.e., a pointer to function),
2214 gdb should give an error. */
2215 v = search_struct_field (name, *argp, t, 0);
2216 /* If we found an ordinary field, then it is not a method call.
2217 So, treat it as if it were a static member function. */
2218 if (v && static_memfuncp)
2219 *static_memfuncp = 1;
2223 throw_error (NOT_FOUND_ERROR,
2224 _("Structure has no component named %s."), name);
2228 /* Given *ARGP, a value of type structure or union, or a pointer/reference
2229 to a structure or union, extract and return its component (field) of
2230 type FTYPE at the specified BITPOS.
2231 Throw an exception on error. */
2234 value_struct_elt_bitpos (struct value **argp, int bitpos, struct type *ftype,
2240 *argp = coerce_array (*argp);
2242 t = check_typedef (value_type (*argp));
2244 while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (t))
2246 *argp = value_ind (*argp);
2247 if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
2248 *argp = coerce_array (*argp);
2249 t = check_typedef (value_type (*argp));
2252 if (TYPE_CODE (t) != TYPE_CODE_STRUCT
2253 && TYPE_CODE (t) != TYPE_CODE_UNION)
2254 error (_("Attempt to extract a component of a value that is not a %s."),
2257 for (i = TYPE_N_BASECLASSES (t); i < TYPE_NFIELDS (t); i++)
2259 if (!field_is_static (&TYPE_FIELD (t, i))
2260 && bitpos == TYPE_FIELD_BITPOS (t, i)
2261 && types_equal (ftype, TYPE_FIELD_TYPE (t, i)))
2262 return value_primitive_field (*argp, 0, i, t);
2265 error (_("No field with matching bitpos and type."));
2271 /* Search through the methods of an object (and its bases) to find a
2272 specified method. Return the pointer to the fn_field list FN_LIST of
2273 overloaded instances defined in the source language. If available
2274 and matching, a vector of matching xmethods defined in extension
2275 languages are also returned in XM_WORKER_VEC
2277 Helper function for value_find_oload_list.
2278 ARGP is a pointer to a pointer to a value (the object).
2279 METHOD is a string containing the method name.
2280 OFFSET is the offset within the value.
2281 TYPE is the assumed type of the object.
2282 FN_LIST is the pointer to matching overloaded instances defined in
2283 source language. Since this is a recursive function, *FN_LIST
2284 should be set to NULL when calling this function.
2285 NUM_FNS is the number of overloaded instances. *NUM_FNS should be set to
2286 0 when calling this function.
2287 XM_WORKER_VEC is the vector of matching xmethod workers. *XM_WORKER_VEC
2288 should also be set to NULL when calling this function.
2289 BASETYPE is set to the actual type of the subobject where the
2291 BOFFSET is the offset of the base subobject where the method is found. */
2294 find_method_list (struct value **argp, const char *method,
2295 LONGEST offset, struct type *type,
2296 struct fn_field **fn_list, int *num_fns,
2297 VEC (xmethod_worker_ptr) **xm_worker_vec,
2298 struct type **basetype, LONGEST *boffset)
2301 struct fn_field *f = NULL;
2302 VEC (xmethod_worker_ptr) *worker_vec = NULL, *new_vec = NULL;
2304 gdb_assert (fn_list != NULL && xm_worker_vec != NULL);
2305 type = check_typedef (type);
2307 /* First check in object itself.
2308 This function is called recursively to search through base classes.
2309 If there is a source method match found at some stage, then we need not
2310 look for source methods in consequent recursive calls. */
2311 if ((*fn_list) == NULL)
2313 for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--)
2315 /* pai: FIXME What about operators and type conversions? */
2316 const char *fn_field_name = TYPE_FN_FIELDLIST_NAME (type, i);
2318 if (fn_field_name && (strcmp_iw (fn_field_name, method) == 0))
2320 int len = TYPE_FN_FIELDLIST_LENGTH (type, i);
2321 f = TYPE_FN_FIELDLIST1 (type, i);
2328 /* Resolve any stub methods. */
2329 check_stub_method_group (type, i);
2336 /* Unlike source methods, xmethods can be accumulated over successive
2337 recursive calls. In other words, an xmethod named 'm' in a class
2338 will not hide an xmethod named 'm' in its base class(es). We want
2339 it to be this way because xmethods are after all convenience functions
2340 and hence there is no point restricting them with something like method
2341 hiding. Moreover, if hiding is done for xmethods as well, then we will
2342 have to provide a mechanism to un-hide (like the 'using' construct). */
2343 worker_vec = get_matching_xmethod_workers (type, method);
2344 new_vec = VEC_merge (xmethod_worker_ptr, *xm_worker_vec, worker_vec);
2346 VEC_free (xmethod_worker_ptr, *xm_worker_vec);
2347 VEC_free (xmethod_worker_ptr, worker_vec);
2348 *xm_worker_vec = new_vec;
2350 /* If source methods are not found in current class, look for them in the
2351 base classes. We also have to go through the base classes to gather
2352 extension methods. */
2353 for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
2355 LONGEST base_offset;
2357 if (BASETYPE_VIA_VIRTUAL (type, i))
2359 base_offset = baseclass_offset (type, i,
2360 value_contents_for_printing (*argp),
2361 value_offset (*argp) + offset,
2362 value_address (*argp), *argp);
2364 else /* Non-virtual base, simply use bit position from debug
2367 base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8;
2370 find_method_list (argp, method, base_offset + offset,
2371 TYPE_BASECLASS (type, i), fn_list, num_fns,
2372 xm_worker_vec, basetype, boffset);
2376 /* Return the list of overloaded methods of a specified name. The methods
2377 could be those GDB finds in the binary, or xmethod. Methods found in
2378 the binary are returned in FN_LIST, and xmethods are returned in
2381 ARGP is a pointer to a pointer to a value (the object).
2382 METHOD is the method name.
2383 OFFSET is the offset within the value contents.
2384 FN_LIST is the pointer to matching overloaded instances defined in
2386 NUM_FNS is the number of overloaded instances.
2387 XM_WORKER_VEC is the vector of matching xmethod workers defined in
2388 extension languages.
2389 BASETYPE is set to the type of the base subobject that defines the
2391 BOFFSET is the offset of the base subobject which defines the method. */
2394 value_find_oload_method_list (struct value **argp, const char *method,
2395 LONGEST offset, struct fn_field **fn_list,
2397 VEC (xmethod_worker_ptr) **xm_worker_vec,
2398 struct type **basetype, LONGEST *boffset)
2402 t = check_typedef (value_type (*argp));
2404 /* Code snarfed from value_struct_elt. */
2405 while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (t))
2407 *argp = value_ind (*argp);
2408 /* Don't coerce fn pointer to fn and then back again! */
2409 if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
2410 *argp = coerce_array (*argp);
2411 t = check_typedef (value_type (*argp));
2414 if (TYPE_CODE (t) != TYPE_CODE_STRUCT
2415 && TYPE_CODE (t) != TYPE_CODE_UNION)
2416 error (_("Attempt to extract a component of a "
2417 "value that is not a struct or union"));
2419 gdb_assert (fn_list != NULL && xm_worker_vec != NULL);
2421 /* Clear the lists. */
2424 *xm_worker_vec = NULL;
2426 find_method_list (argp, method, 0, t, fn_list, num_fns, xm_worker_vec,
2430 /* Given an array of arguments (ARGS) (which includes an
2431 entry for "this" in the case of C++ methods), the number of
2432 arguments NARGS, the NAME of a function, and whether it's a method or
2433 not (METHOD), find the best function that matches on the argument types
2434 according to the overload resolution rules.
2436 METHOD can be one of three values:
2437 NON_METHOD for non-member functions.
2438 METHOD: for member functions.
2439 BOTH: used for overload resolution of operators where the
2440 candidates are expected to be either member or non member
2441 functions. In this case the first argument ARGTYPES
2442 (representing 'this') is expected to be a reference to the
2443 target object, and will be dereferenced when attempting the
2446 In the case of class methods, the parameter OBJ is an object value
2447 in which to search for overloaded methods.
2449 In the case of non-method functions, the parameter FSYM is a symbol
2450 corresponding to one of the overloaded functions.
2452 Return value is an integer: 0 -> good match, 10 -> debugger applied
2453 non-standard coercions, 100 -> incompatible.
2455 If a method is being searched for, VALP will hold the value.
2456 If a non-method is being searched for, SYMP will hold the symbol
2459 If a method is being searched for, and it is a static method,
2460 then STATICP will point to a non-zero value.
2462 If NO_ADL argument dependent lookup is disabled. This is used to prevent
2463 ADL overload candidates when performing overload resolution for a fully
2466 If NOSIDE is EVAL_AVOID_SIDE_EFFECTS, then OBJP's memory cannot be
2467 read while picking the best overload match (it may be all zeroes and thus
2468 not have a vtable pointer), in which case skip virtual function lookup.
2469 This is ok as typically EVAL_AVOID_SIDE_EFFECTS is only used to determine
2472 Note: This function does *not* check the value of
2473 overload_resolution. Caller must check it to see whether overload
2474 resolution is permitted. */
2477 find_overload_match (struct value **args, int nargs,
2478 const char *name, enum oload_search_type method,
2479 struct value **objp, struct symbol *fsym,
2480 struct value **valp, struct symbol **symp,
2481 int *staticp, const int no_adl,
2482 const enum noside noside)
2484 struct value *obj = (objp ? *objp : NULL);
2485 struct type *obj_type = obj ? value_type (obj) : NULL;
2486 /* Index of best overloaded function. */
2487 int func_oload_champ = -1;
2488 int method_oload_champ = -1;
2489 int src_method_oload_champ = -1;
2490 int ext_method_oload_champ = -1;
2492 /* The measure for the current best match. */
2493 struct badness_vector *method_badness = NULL;
2494 struct badness_vector *func_badness = NULL;
2495 struct badness_vector *ext_method_badness = NULL;
2496 struct badness_vector *src_method_badness = NULL;
2498 struct value *temp = obj;
2499 /* For methods, the list of overloaded methods. */
2500 struct fn_field *fns_ptr = NULL;
2501 /* For non-methods, the list of overloaded function symbols. */
2502 struct symbol **oload_syms = NULL;
2503 /* For xmethods, the VEC of xmethod workers. */
2504 VEC (xmethod_worker_ptr) *xm_worker_vec = NULL;
2505 /* Number of overloaded instances being considered. */
2507 struct type *basetype = NULL;
2510 struct cleanup *all_cleanups = make_cleanup (null_cleanup, NULL);
2512 const char *obj_type_name = NULL;
2513 const char *func_name = NULL;
2514 enum oload_classification match_quality;
2515 enum oload_classification method_match_quality = INCOMPATIBLE;
2516 enum oload_classification src_method_match_quality = INCOMPATIBLE;
2517 enum oload_classification ext_method_match_quality = INCOMPATIBLE;
2518 enum oload_classification func_match_quality = INCOMPATIBLE;
2520 /* Get the list of overloaded methods or functions. */
2521 if (method == METHOD || method == BOTH)
2525 /* OBJ may be a pointer value rather than the object itself. */
2526 obj = coerce_ref (obj);
2527 while (TYPE_CODE (check_typedef (value_type (obj))) == TYPE_CODE_PTR)
2528 obj = coerce_ref (value_ind (obj));
2529 obj_type_name = TYPE_NAME (value_type (obj));
2531 /* First check whether this is a data member, e.g. a pointer to
2533 if (TYPE_CODE (check_typedef (value_type (obj))) == TYPE_CODE_STRUCT)
2535 *valp = search_struct_field (name, obj,
2536 check_typedef (value_type (obj)), 0);
2540 do_cleanups (all_cleanups);
2545 /* Retrieve the list of methods with the name NAME. */
2546 value_find_oload_method_list (&temp, name, 0, &fns_ptr, &num_fns,
2547 &xm_worker_vec, &basetype, &boffset);
2548 /* If this is a method only search, and no methods were found
2549 the search has faild. */
2550 if (method == METHOD && (!fns_ptr || !num_fns) && !xm_worker_vec)
2551 error (_("Couldn't find method %s%s%s"),
2553 (obj_type_name && *obj_type_name) ? "::" : "",
2555 /* If we are dealing with stub method types, they should have
2556 been resolved by find_method_list via
2557 value_find_oload_method_list above. */
2560 gdb_assert (TYPE_SELF_TYPE (fns_ptr[0].type) != NULL);
2562 src_method_oload_champ = find_oload_champ (args, nargs,
2563 num_fns, fns_ptr, NULL,
2564 NULL, &src_method_badness);
2566 src_method_match_quality = classify_oload_match
2567 (src_method_badness, nargs,
2568 oload_method_static_p (fns_ptr, src_method_oload_champ));
2570 make_cleanup (xfree, src_method_badness);
2573 if (VEC_length (xmethod_worker_ptr, xm_worker_vec) > 0)
2575 ext_method_oload_champ = find_oload_champ (args, nargs,
2576 0, NULL, xm_worker_vec,
2577 NULL, &ext_method_badness);
2578 ext_method_match_quality = classify_oload_match (ext_method_badness,
2580 make_cleanup (xfree, ext_method_badness);
2581 make_cleanup (free_xmethod_worker_vec, xm_worker_vec);
2584 if (src_method_oload_champ >= 0 && ext_method_oload_champ >= 0)
2586 switch (compare_badness (ext_method_badness, src_method_badness))
2588 case 0: /* Src method and xmethod are equally good. */
2589 /* If src method and xmethod are equally good, then
2590 xmethod should be the winner. Hence, fall through to the
2591 case where a xmethod is better than the source
2592 method, except when the xmethod match quality is
2595 case 1: /* Src method and ext method are incompatible. */
2596 /* If ext method match is not standard, then let source method
2597 win. Otherwise, fallthrough to let xmethod win. */
2598 if (ext_method_match_quality != STANDARD)
2600 method_oload_champ = src_method_oload_champ;
2601 method_badness = src_method_badness;
2602 ext_method_oload_champ = -1;
2603 method_match_quality = src_method_match_quality;
2607 case 2: /* Ext method is champion. */
2608 method_oload_champ = ext_method_oload_champ;
2609 method_badness = ext_method_badness;
2610 src_method_oload_champ = -1;
2611 method_match_quality = ext_method_match_quality;
2613 case 3: /* Src method is champion. */
2614 method_oload_champ = src_method_oload_champ;
2615 method_badness = src_method_badness;
2616 ext_method_oload_champ = -1;
2617 method_match_quality = src_method_match_quality;
2620 gdb_assert_not_reached ("Unexpected overload comparison "
2625 else if (src_method_oload_champ >= 0)
2627 method_oload_champ = src_method_oload_champ;
2628 method_badness = src_method_badness;
2629 method_match_quality = src_method_match_quality;
2631 else if (ext_method_oload_champ >= 0)
2633 method_oload_champ = ext_method_oload_champ;
2634 method_badness = ext_method_badness;
2635 method_match_quality = ext_method_match_quality;
2639 if (method == NON_METHOD || method == BOTH)
2641 const char *qualified_name = NULL;
2643 /* If the overload match is being search for both as a method
2644 and non member function, the first argument must now be
2647 args[0] = value_ind (args[0]);
2651 qualified_name = SYMBOL_NATURAL_NAME (fsym);
2653 /* If we have a function with a C++ name, try to extract just
2654 the function part. Do not try this for non-functions (e.g.
2655 function pointers). */
2657 && TYPE_CODE (check_typedef (SYMBOL_TYPE (fsym)))
2662 temp = cp_func_name (qualified_name);
2664 /* If cp_func_name did not remove anything, the name of the
2665 symbol did not include scope or argument types - it was
2666 probably a C-style function. */
2669 make_cleanup (xfree, temp);
2670 if (strcmp (temp, qualified_name) == 0)
2680 qualified_name = name;
2683 /* If there was no C++ name, this must be a C-style function or
2684 not a function at all. Just return the same symbol. Do the
2685 same if cp_func_name fails for some reason. */
2686 if (func_name == NULL)
2689 do_cleanups (all_cleanups);
2693 func_oload_champ = find_oload_champ_namespace (args, nargs,
2700 if (func_oload_champ >= 0)
2701 func_match_quality = classify_oload_match (func_badness, nargs, 0);
2703 make_cleanup (xfree, oload_syms);
2704 make_cleanup (xfree, func_badness);
2707 /* Did we find a match ? */
2708 if (method_oload_champ == -1 && func_oload_champ == -1)
2709 throw_error (NOT_FOUND_ERROR,
2710 _("No symbol \"%s\" in current context."),
2713 /* If we have found both a method match and a function
2714 match, find out which one is better, and calculate match
2716 if (method_oload_champ >= 0 && func_oload_champ >= 0)
2718 switch (compare_badness (func_badness, method_badness))
2720 case 0: /* Top two contenders are equally good. */
2721 /* FIXME: GDB does not support the general ambiguous case.
2722 All candidates should be collected and presented the
2724 error (_("Ambiguous overload resolution"));
2726 case 1: /* Incomparable top contenders. */
2727 /* This is an error incompatible candidates
2728 should not have been proposed. */
2729 error (_("Internal error: incompatible "
2730 "overload candidates proposed"));
2732 case 2: /* Function champion. */
2733 method_oload_champ = -1;
2734 match_quality = func_match_quality;
2736 case 3: /* Method champion. */
2737 func_oload_champ = -1;
2738 match_quality = method_match_quality;
2741 error (_("Internal error: unexpected overload comparison result"));
2747 /* We have either a method match or a function match. */
2748 if (method_oload_champ >= 0)
2749 match_quality = method_match_quality;
2751 match_quality = func_match_quality;
2754 if (match_quality == INCOMPATIBLE)
2756 if (method == METHOD)
2757 error (_("Cannot resolve method %s%s%s to any overloaded instance"),
2759 (obj_type_name && *obj_type_name) ? "::" : "",
2762 error (_("Cannot resolve function %s to any overloaded instance"),
2765 else if (match_quality == NON_STANDARD)
2767 if (method == METHOD)
2768 warning (_("Using non-standard conversion to match "
2769 "method %s%s%s to supplied arguments"),
2771 (obj_type_name && *obj_type_name) ? "::" : "",
2774 warning (_("Using non-standard conversion to match "
2775 "function %s to supplied arguments"),
2779 if (staticp != NULL)
2780 *staticp = oload_method_static_p (fns_ptr, method_oload_champ);
2782 if (method_oload_champ >= 0)
2784 if (src_method_oload_champ >= 0)
2786 if (TYPE_FN_FIELD_VIRTUAL_P (fns_ptr, method_oload_champ)
2787 && noside != EVAL_AVOID_SIDE_EFFECTS)
2789 *valp = value_virtual_fn_field (&temp, fns_ptr,
2790 method_oload_champ, basetype,
2794 *valp = value_fn_field (&temp, fns_ptr, method_oload_champ,
2799 *valp = value_of_xmethod (clone_xmethod_worker
2800 (VEC_index (xmethod_worker_ptr, xm_worker_vec,
2801 ext_method_oload_champ)));
2805 *symp = oload_syms[func_oload_champ];
2809 struct type *temp_type = check_typedef (value_type (temp));
2810 struct type *objtype = check_typedef (obj_type);
2812 if (TYPE_CODE (temp_type) != TYPE_CODE_PTR
2813 && (TYPE_CODE (objtype) == TYPE_CODE_PTR
2814 || TYPE_IS_REFERENCE (objtype)))
2816 temp = value_addr (temp);
2821 do_cleanups (all_cleanups);
2823 switch (match_quality)
2829 default: /* STANDARD */
2834 /* Find the best overload match, searching for FUNC_NAME in namespaces
2835 contained in QUALIFIED_NAME until it either finds a good match or
2836 runs out of namespaces. It stores the overloaded functions in
2837 *OLOAD_SYMS, and the badness vector in *OLOAD_CHAMP_BV. The
2838 calling function is responsible for freeing *OLOAD_SYMS and
2839 *OLOAD_CHAMP_BV. If NO_ADL, argument dependent lookup is not
2843 find_oload_champ_namespace (struct value **args, int nargs,
2844 const char *func_name,
2845 const char *qualified_name,
2846 struct symbol ***oload_syms,
2847 struct badness_vector **oload_champ_bv,
2852 find_oload_champ_namespace_loop (args, nargs,
2855 oload_syms, oload_champ_bv,
2862 /* Helper function for find_oload_champ_namespace; NAMESPACE_LEN is
2863 how deep we've looked for namespaces, and the champ is stored in
2864 OLOAD_CHAMP. The return value is 1 if the champ is a good one, 0
2865 if it isn't. Other arguments are the same as in
2866 find_oload_champ_namespace
2868 It is the caller's responsibility to free *OLOAD_SYMS and
2872 find_oload_champ_namespace_loop (struct value **args, int nargs,
2873 const char *func_name,
2874 const char *qualified_name,
2876 struct symbol ***oload_syms,
2877 struct badness_vector **oload_champ_bv,
2881 int next_namespace_len = namespace_len;
2882 int searched_deeper = 0;
2884 struct cleanup *old_cleanups;
2885 int new_oload_champ;
2886 struct symbol **new_oload_syms;
2887 struct badness_vector *new_oload_champ_bv;
2888 char *new_namespace;
2890 if (next_namespace_len != 0)
2892 gdb_assert (qualified_name[next_namespace_len] == ':');
2893 next_namespace_len += 2;
2895 next_namespace_len +=
2896 cp_find_first_component (qualified_name + next_namespace_len);
2898 /* Initialize these to values that can safely be xfree'd. */
2900 *oload_champ_bv = NULL;
2902 /* First, see if we have a deeper namespace we can search in.
2903 If we get a good match there, use it. */
2905 if (qualified_name[next_namespace_len] == ':')
2907 searched_deeper = 1;
2909 if (find_oload_champ_namespace_loop (args, nargs,
2910 func_name, qualified_name,
2912 oload_syms, oload_champ_bv,
2913 oload_champ, no_adl))
2919 /* If we reach here, either we're in the deepest namespace or we
2920 didn't find a good match in a deeper namespace. But, in the
2921 latter case, we still have a bad match in a deeper namespace;
2922 note that we might not find any match at all in the current
2923 namespace. (There's always a match in the deepest namespace,
2924 because this overload mechanism only gets called if there's a
2925 function symbol to start off with.) */
2927 old_cleanups = make_cleanup (xfree, *oload_syms);
2928 make_cleanup (xfree, *oload_champ_bv);
2929 new_namespace = (char *) alloca (namespace_len + 1);
2930 strncpy (new_namespace, qualified_name, namespace_len);
2931 new_namespace[namespace_len] = '\0';
2932 new_oload_syms = make_symbol_overload_list (func_name,
2935 /* If we have reached the deepest level perform argument
2936 determined lookup. */
2937 if (!searched_deeper && !no_adl)
2940 struct type **arg_types;
2942 /* Prepare list of argument types for overload resolution. */
2943 arg_types = (struct type **)
2944 alloca (nargs * (sizeof (struct type *)));
2945 for (ix = 0; ix < nargs; ix++)
2946 arg_types[ix] = value_type (args[ix]);
2947 make_symbol_overload_list_adl (arg_types, nargs, func_name);
2950 while (new_oload_syms[num_fns])
2953 new_oload_champ = find_oload_champ (args, nargs, num_fns,
2954 NULL, NULL, new_oload_syms,
2955 &new_oload_champ_bv);
2957 /* Case 1: We found a good match. Free earlier matches (if any),
2958 and return it. Case 2: We didn't find a good match, but we're
2959 not the deepest function. Then go with the bad match that the
2960 deeper function found. Case 3: We found a bad match, and we're
2961 the deepest function. Then return what we found, even though
2962 it's a bad match. */
2964 if (new_oload_champ != -1
2965 && classify_oload_match (new_oload_champ_bv, nargs, 0) == STANDARD)
2967 *oload_syms = new_oload_syms;
2968 *oload_champ = new_oload_champ;
2969 *oload_champ_bv = new_oload_champ_bv;
2970 do_cleanups (old_cleanups);
2973 else if (searched_deeper)
2975 xfree (new_oload_syms);
2976 xfree (new_oload_champ_bv);
2977 discard_cleanups (old_cleanups);
2982 *oload_syms = new_oload_syms;
2983 *oload_champ = new_oload_champ;
2984 *oload_champ_bv = new_oload_champ_bv;
2985 do_cleanups (old_cleanups);
2990 /* Look for a function to take NARGS args of ARGS. Find
2991 the best match from among the overloaded methods or functions
2992 given by FNS_PTR or OLOAD_SYMS or XM_WORKER_VEC, respectively.
2993 One, and only one of FNS_PTR, OLOAD_SYMS and XM_WORKER_VEC can be
2996 If XM_WORKER_VEC is NULL, then the length of the arrays FNS_PTR
2997 or OLOAD_SYMS (whichever is non-NULL) is specified in NUM_FNS.
2999 Return the index of the best match; store an indication of the
3000 quality of the match in OLOAD_CHAMP_BV.
3002 It is the caller's responsibility to free *OLOAD_CHAMP_BV. */
3005 find_oload_champ (struct value **args, int nargs,
3006 int num_fns, struct fn_field *fns_ptr,
3007 VEC (xmethod_worker_ptr) *xm_worker_vec,
3008 struct symbol **oload_syms,
3009 struct badness_vector **oload_champ_bv)
3013 /* A measure of how good an overloaded instance is. */
3014 struct badness_vector *bv;
3015 /* Index of best overloaded function. */
3016 int oload_champ = -1;
3017 /* Current ambiguity state for overload resolution. */
3018 int oload_ambiguous = 0;
3019 /* 0 => no ambiguity, 1 => two good funcs, 2 => incomparable funcs. */
3021 /* A champion can be found among methods alone, or among functions
3022 alone, or in xmethods alone, but not in more than one of these
3024 gdb_assert ((fns_ptr != NULL) + (oload_syms != NULL) + (xm_worker_vec != NULL)
3027 *oload_champ_bv = NULL;
3029 fn_count = (xm_worker_vec != NULL
3030 ? VEC_length (xmethod_worker_ptr, xm_worker_vec)
3032 /* Consider each candidate in turn. */
3033 for (ix = 0; ix < fn_count; ix++)
3036 int static_offset = 0;
3038 struct type **parm_types;
3039 struct xmethod_worker *worker = NULL;
3041 if (xm_worker_vec != NULL)
3043 worker = VEC_index (xmethod_worker_ptr, xm_worker_vec, ix);
3044 parm_types = get_xmethod_arg_types (worker, &nparms);
3048 if (fns_ptr != NULL)
3050 nparms = TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (fns_ptr, ix));
3051 static_offset = oload_method_static_p (fns_ptr, ix);
3054 nparms = TYPE_NFIELDS (SYMBOL_TYPE (oload_syms[ix]));
3056 parm_types = XNEWVEC (struct type *, nparms);
3057 for (jj = 0; jj < nparms; jj++)
3058 parm_types[jj] = (fns_ptr != NULL
3059 ? (TYPE_FN_FIELD_ARGS (fns_ptr, ix)[jj].type)
3060 : TYPE_FIELD_TYPE (SYMBOL_TYPE (oload_syms[ix]),
3064 /* Compare parameter types to supplied argument types. Skip
3065 THIS for static methods. */
3066 bv = rank_function (parm_types, nparms,
3067 args + static_offset,
3068 nargs - static_offset);
3070 if (!*oload_champ_bv)
3072 *oload_champ_bv = bv;
3075 else /* See whether current candidate is better or worse than
3077 switch (compare_badness (bv, *oload_champ_bv))
3079 case 0: /* Top two contenders are equally good. */
3080 oload_ambiguous = 1;
3082 case 1: /* Incomparable top contenders. */
3083 oload_ambiguous = 2;
3085 case 2: /* New champion, record details. */
3086 *oload_champ_bv = bv;
3087 oload_ambiguous = 0;
3097 if (fns_ptr != NULL)
3098 fprintf_filtered (gdb_stderr,
3099 "Overloaded method instance %s, # of parms %d\n",
3100 fns_ptr[ix].physname, nparms);
3101 else if (xm_worker_vec != NULL)
3102 fprintf_filtered (gdb_stderr,
3103 "Xmethod worker, # of parms %d\n",
3106 fprintf_filtered (gdb_stderr,
3107 "Overloaded function instance "
3108 "%s # of parms %d\n",
3109 SYMBOL_DEMANGLED_NAME (oload_syms[ix]),
3111 for (jj = 0; jj < nargs - static_offset; jj++)
3112 fprintf_filtered (gdb_stderr,
3113 "...Badness @ %d : %d\n",
3114 jj, bv->rank[jj].rank);
3115 fprintf_filtered (gdb_stderr, "Overload resolution "
3116 "champion is %d, ambiguous? %d\n",
3117 oload_champ, oload_ambiguous);
3124 /* Return 1 if we're looking at a static method, 0 if we're looking at
3125 a non-static method or a function that isn't a method. */
3128 oload_method_static_p (struct fn_field *fns_ptr, int index)
3130 if (fns_ptr && index >= 0 && TYPE_FN_FIELD_STATIC_P (fns_ptr, index))
3136 /* Check how good an overload match OLOAD_CHAMP_BV represents. */
3138 static enum oload_classification
3139 classify_oload_match (struct badness_vector *oload_champ_bv,
3144 enum oload_classification worst = STANDARD;
3146 for (ix = 1; ix <= nargs - static_offset; ix++)
3148 /* If this conversion is as bad as INCOMPATIBLE_TYPE_BADNESS
3149 or worse return INCOMPATIBLE. */
3150 if (compare_ranks (oload_champ_bv->rank[ix],
3151 INCOMPATIBLE_TYPE_BADNESS) <= 0)
3152 return INCOMPATIBLE; /* Truly mismatched types. */
3153 /* Otherwise If this conversion is as bad as
3154 NS_POINTER_CONVERSION_BADNESS or worse return NON_STANDARD. */
3155 else if (compare_ranks (oload_champ_bv->rank[ix],
3156 NS_POINTER_CONVERSION_BADNESS) <= 0)
3157 worst = NON_STANDARD; /* Non-standard type conversions
3161 /* If no INCOMPATIBLE classification was found, return the worst one
3162 that was found (if any). */
3166 /* C++: return 1 is NAME is a legitimate name for the destructor of
3167 type TYPE. If TYPE does not have a destructor, or if NAME is
3168 inappropriate for TYPE, an error is signaled. Parameter TYPE should not yet
3169 have CHECK_TYPEDEF applied, this function will apply it itself. */
3172 destructor_name_p (const char *name, struct type *type)
3176 const char *dname = type_name_no_tag_or_error (type);
3177 const char *cp = strchr (dname, '<');
3180 /* Do not compare the template part for template classes. */
3182 len = strlen (dname);
3185 if (strlen (name + 1) != len || strncmp (dname, name + 1, len) != 0)
3186 error (_("name of destructor must equal name of class"));
3193 /* Find an enum constant named NAME in TYPE. TYPE must be an "enum
3194 class". If the name is found, return a value representing it;
3195 otherwise throw an exception. */
3197 static struct value *
3198 enum_constant_from_type (struct type *type, const char *name)
3201 int name_len = strlen (name);
3203 gdb_assert (TYPE_CODE (type) == TYPE_CODE_ENUM
3204 && TYPE_DECLARED_CLASS (type));
3206 for (i = TYPE_N_BASECLASSES (type); i < TYPE_NFIELDS (type); ++i)
3208 const char *fname = TYPE_FIELD_NAME (type, i);
3211 if (TYPE_FIELD_LOC_KIND (type, i) != FIELD_LOC_KIND_ENUMVAL
3215 /* Look for the trailing "::NAME", since enum class constant
3216 names are qualified here. */
3217 len = strlen (fname);
3218 if (len + 2 >= name_len
3219 && fname[len - name_len - 2] == ':'
3220 && fname[len - name_len - 1] == ':'
3221 && strcmp (&fname[len - name_len], name) == 0)
3222 return value_from_longest (type, TYPE_FIELD_ENUMVAL (type, i));
3225 error (_("no constant named \"%s\" in enum \"%s\""),
3226 name, TYPE_TAG_NAME (type));
3229 /* C++: Given an aggregate type CURTYPE, and a member name NAME,
3230 return the appropriate member (or the address of the member, if
3231 WANT_ADDRESS). This function is used to resolve user expressions
3232 of the form "DOMAIN::NAME". For more details on what happens, see
3233 the comment before value_struct_elt_for_reference. */
3236 value_aggregate_elt (struct type *curtype, const char *name,
3237 struct type *expect_type, int want_address,
3240 switch (TYPE_CODE (curtype))
3242 case TYPE_CODE_STRUCT:
3243 case TYPE_CODE_UNION:
3244 return value_struct_elt_for_reference (curtype, 0, curtype,
3246 want_address, noside);
3247 case TYPE_CODE_NAMESPACE:
3248 return value_namespace_elt (curtype, name,
3249 want_address, noside);
3251 case TYPE_CODE_ENUM:
3252 return enum_constant_from_type (curtype, name);
3255 internal_error (__FILE__, __LINE__,
3256 _("non-aggregate type in value_aggregate_elt"));
3260 /* Compares the two method/function types T1 and T2 for "equality"
3261 with respect to the methods' parameters. If the types of the
3262 two parameter lists are the same, returns 1; 0 otherwise. This
3263 comparison may ignore any artificial parameters in T1 if
3264 SKIP_ARTIFICIAL is non-zero. This function will ALWAYS skip
3265 the first artificial parameter in T1, assumed to be a 'this' pointer.
3267 The type T2 is expected to have come from make_params (in eval.c). */
3270 compare_parameters (struct type *t1, struct type *t2, int skip_artificial)
3274 if (TYPE_NFIELDS (t1) > 0 && TYPE_FIELD_ARTIFICIAL (t1, 0))
3277 /* If skipping artificial fields, find the first real field
3279 if (skip_artificial)
3281 while (start < TYPE_NFIELDS (t1)
3282 && TYPE_FIELD_ARTIFICIAL (t1, start))
3286 /* Now compare parameters. */
3288 /* Special case: a method taking void. T1 will contain no
3289 non-artificial fields, and T2 will contain TYPE_CODE_VOID. */
3290 if ((TYPE_NFIELDS (t1) - start) == 0 && TYPE_NFIELDS (t2) == 1
3291 && TYPE_CODE (TYPE_FIELD_TYPE (t2, 0)) == TYPE_CODE_VOID)
3294 if ((TYPE_NFIELDS (t1) - start) == TYPE_NFIELDS (t2))
3298 for (i = 0; i < TYPE_NFIELDS (t2); ++i)
3300 if (compare_ranks (rank_one_type (TYPE_FIELD_TYPE (t1, start + i),
3301 TYPE_FIELD_TYPE (t2, i), NULL),
3302 EXACT_MATCH_BADNESS) != 0)
3312 /* C++: Given an aggregate type CURTYPE, and a member name NAME,
3313 return the address of this member as a "pointer to member" type.
3314 If INTYPE is non-null, then it will be the type of the member we
3315 are looking for. This will help us resolve "pointers to member
3316 functions". This function is used to resolve user expressions of
3317 the form "DOMAIN::NAME". */
3319 static struct value *
3320 value_struct_elt_for_reference (struct type *domain, int offset,
3321 struct type *curtype, const char *name,
3322 struct type *intype,
3326 struct type *t = curtype;
3328 struct value *v, *result;
3330 if (TYPE_CODE (t) != TYPE_CODE_STRUCT
3331 && TYPE_CODE (t) != TYPE_CODE_UNION)
3332 error (_("Internal error: non-aggregate type "
3333 "to value_struct_elt_for_reference"));
3335 for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--)
3337 const char *t_field_name = TYPE_FIELD_NAME (t, i);
3339 if (t_field_name && strcmp (t_field_name, name) == 0)
3341 if (field_is_static (&TYPE_FIELD (t, i)))
3343 v = value_static_field (t, i);
3348 if (TYPE_FIELD_PACKED (t, i))
3349 error (_("pointers to bitfield members not allowed"));
3352 return value_from_longest
3353 (lookup_memberptr_type (TYPE_FIELD_TYPE (t, i), domain),
3354 offset + (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3));
3355 else if (noside != EVAL_NORMAL)
3356 return allocate_value (TYPE_FIELD_TYPE (t, i));
3359 /* Try to evaluate NAME as a qualified name with implicit
3360 this pointer. In this case, attempt to return the
3361 equivalent to `this->*(&TYPE::NAME)'. */
3362 v = value_of_this_silent (current_language);
3367 struct type *type, *tmp;
3369 ptr = value_aggregate_elt (domain, name, NULL, 1, noside);
3370 type = check_typedef (value_type (ptr));
3371 gdb_assert (type != NULL
3372 && TYPE_CODE (type) == TYPE_CODE_MEMBERPTR);
3373 tmp = lookup_pointer_type (TYPE_SELF_TYPE (type));
3374 v = value_cast_pointers (tmp, v, 1);
3375 mem_offset = value_as_long (ptr);
3376 tmp = lookup_pointer_type (TYPE_TARGET_TYPE (type));
3377 result = value_from_pointer (tmp,
3378 value_as_long (v) + mem_offset);
3379 return value_ind (result);
3382 error (_("Cannot reference non-static field \"%s\""), name);
3387 /* C++: If it was not found as a data field, then try to return it
3388 as a pointer to a method. */
3390 /* Perform all necessary dereferencing. */
3391 while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR)
3392 intype = TYPE_TARGET_TYPE (intype);
3394 for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i)
3396 const char *t_field_name = TYPE_FN_FIELDLIST_NAME (t, i);
3397 char dem_opname[64];
3399 if (startswith (t_field_name, "__")
3400 || startswith (t_field_name, "op")
3401 || startswith (t_field_name, "type"))
3403 if (cplus_demangle_opname (t_field_name,
3404 dem_opname, DMGL_ANSI))
3405 t_field_name = dem_opname;
3406 else if (cplus_demangle_opname (t_field_name,
3408 t_field_name = dem_opname;
3410 if (t_field_name && strcmp (t_field_name, name) == 0)
3413 int len = TYPE_FN_FIELDLIST_LENGTH (t, i);
3414 struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i);
3416 check_stub_method_group (t, i);
3420 for (j = 0; j < len; ++j)
3422 if (compare_parameters (TYPE_FN_FIELD_TYPE (f, j), intype, 0)
3423 || compare_parameters (TYPE_FN_FIELD_TYPE (f, j),
3429 error (_("no member function matches "
3430 "that type instantiation"));
3437 for (ii = 0; ii < len; ++ii)
3439 /* Skip artificial methods. This is necessary if,
3440 for example, the user wants to "print
3441 subclass::subclass" with only one user-defined
3442 constructor. There is no ambiguity in this case.
3443 We are careful here to allow artificial methods
3444 if they are the unique result. */
3445 if (TYPE_FN_FIELD_ARTIFICIAL (f, ii))
3452 /* Desired method is ambiguous if more than one
3453 method is defined. */
3454 if (j != -1 && !TYPE_FN_FIELD_ARTIFICIAL (f, j))
3455 error (_("non-unique member `%s' requires "
3456 "type instantiation"), name);
3462 error (_("no matching member function"));
3465 if (TYPE_FN_FIELD_STATIC_P (f, j))
3468 lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
3469 0, VAR_DOMAIN, 0).symbol;
3475 return value_addr (read_var_value (s, 0, 0));
3477 return read_var_value (s, 0, 0);
3480 if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
3484 result = allocate_value
3485 (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j)));
3486 cplus_make_method_ptr (value_type (result),
3487 value_contents_writeable (result),
3488 TYPE_FN_FIELD_VOFFSET (f, j), 1);
3490 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
3491 return allocate_value (TYPE_FN_FIELD_TYPE (f, j));
3493 error (_("Cannot reference virtual member function \"%s\""),
3499 lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
3500 0, VAR_DOMAIN, 0).symbol;
3505 v = read_var_value (s, 0, 0);
3510 result = allocate_value (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j)));
3511 cplus_make_method_ptr (value_type (result),
3512 value_contents_writeable (result),
3513 value_address (v), 0);
3519 for (i = TYPE_N_BASECLASSES (t) - 1; i >= 0; i--)
3524 if (BASETYPE_VIA_VIRTUAL (t, i))
3527 base_offset = TYPE_BASECLASS_BITPOS (t, i) / 8;
3528 v = value_struct_elt_for_reference (domain,
3529 offset + base_offset,
3530 TYPE_BASECLASS (t, i),
3532 want_address, noside);
3537 /* As a last chance, pretend that CURTYPE is a namespace, and look
3538 it up that way; this (frequently) works for types nested inside
3541 return value_maybe_namespace_elt (curtype, name,
3542 want_address, noside);
3545 /* C++: Return the member NAME of the namespace given by the type
3548 static struct value *
3549 value_namespace_elt (const struct type *curtype,
3550 const char *name, int want_address,
3553 struct value *retval = value_maybe_namespace_elt (curtype, name,
3558 error (_("No symbol \"%s\" in namespace \"%s\"."),
3559 name, TYPE_TAG_NAME (curtype));
3564 /* A helper function used by value_namespace_elt and
3565 value_struct_elt_for_reference. It looks up NAME inside the
3566 context CURTYPE; this works if CURTYPE is a namespace or if CURTYPE
3567 is a class and NAME refers to a type in CURTYPE itself (as opposed
3568 to, say, some base class of CURTYPE). */
3570 static struct value *
3571 value_maybe_namespace_elt (const struct type *curtype,
3572 const char *name, int want_address,
3575 const char *namespace_name = TYPE_TAG_NAME (curtype);
3576 struct block_symbol sym;
3577 struct value *result;
3579 sym = cp_lookup_symbol_namespace (namespace_name, name,
3580 get_selected_block (0), VAR_DOMAIN);
3582 if (sym.symbol == NULL)
3584 else if ((noside == EVAL_AVOID_SIDE_EFFECTS)
3585 && (SYMBOL_CLASS (sym.symbol) == LOC_TYPEDEF))
3586 result = allocate_value (SYMBOL_TYPE (sym.symbol));
3588 result = value_of_variable (sym.symbol, sym.block);
3591 result = value_addr (result);
3596 /* Given a pointer or a reference value V, find its real (RTTI) type.
3598 Other parameters FULL, TOP, USING_ENC as with value_rtti_type()
3599 and refer to the values computed for the object pointed to. */
3602 value_rtti_indirect_type (struct value *v, int *full,
3603 LONGEST *top, int *using_enc)
3605 struct value *target = NULL;
3606 struct type *type, *real_type, *target_type;
3608 type = value_type (v);
3609 type = check_typedef (type);
3610 if (TYPE_IS_REFERENCE (type))
3611 target = coerce_ref (v);
3612 else if (TYPE_CODE (type) == TYPE_CODE_PTR)
3617 target = value_ind (v);
3619 CATCH (except, RETURN_MASK_ERROR)
3621 if (except.error == MEMORY_ERROR)
3623 /* value_ind threw a memory error. The pointer is NULL or
3624 contains an uninitialized value: we can't determine any
3628 throw_exception (except);
3635 real_type = value_rtti_type (target, full, top, using_enc);
3639 /* Copy qualifiers to the referenced object. */
3640 target_type = value_type (target);
3641 real_type = make_cv_type (TYPE_CONST (target_type),
3642 TYPE_VOLATILE (target_type), real_type, NULL);
3643 if (TYPE_IS_REFERENCE (type))
3644 real_type = lookup_reference_type (real_type, TYPE_CODE (type));
3645 else if (TYPE_CODE (type) == TYPE_CODE_PTR)
3646 real_type = lookup_pointer_type (real_type);
3648 internal_error (__FILE__, __LINE__, _("Unexpected value type."));
3650 /* Copy qualifiers to the pointer/reference. */
3651 real_type = make_cv_type (TYPE_CONST (type), TYPE_VOLATILE (type),
3658 /* Given a value pointed to by ARGP, check its real run-time type, and
3659 if that is different from the enclosing type, create a new value
3660 using the real run-time type as the enclosing type (and of the same
3661 type as ARGP) and return it, with the embedded offset adjusted to
3662 be the correct offset to the enclosed object. RTYPE is the type,
3663 and XFULL, XTOP, and XUSING_ENC are the other parameters, computed
3664 by value_rtti_type(). If these are available, they can be supplied
3665 and a second call to value_rtti_type() is avoided. (Pass RTYPE ==
3666 NULL if they're not available. */
3669 value_full_object (struct value *argp,
3671 int xfull, int xtop,
3674 struct type *real_type;
3678 struct value *new_val;
3685 using_enc = xusing_enc;
3688 real_type = value_rtti_type (argp, &full, &top, &using_enc);
3690 /* If no RTTI data, or if object is already complete, do nothing. */
3691 if (!real_type || real_type == value_enclosing_type (argp))
3694 /* In a destructor we might see a real type that is a superclass of
3695 the object's type. In this case it is better to leave the object
3698 && TYPE_LENGTH (real_type) < TYPE_LENGTH (value_enclosing_type (argp)))
3701 /* If we have the full object, but for some reason the enclosing
3702 type is wrong, set it. */
3703 /* pai: FIXME -- sounds iffy */
3706 argp = value_copy (argp);
3707 set_value_enclosing_type (argp, real_type);
3711 /* Check if object is in memory. */
3712 if (VALUE_LVAL (argp) != lval_memory)
3714 warning (_("Couldn't retrieve complete object of RTTI "
3715 "type %s; object may be in register(s)."),
3716 TYPE_NAME (real_type));
3721 /* All other cases -- retrieve the complete object. */
3722 /* Go back by the computed top_offset from the beginning of the
3723 object, adjusting for the embedded offset of argp if that's what
3724 value_rtti_type used for its computation. */
3725 new_val = value_at_lazy (real_type, value_address (argp) - top +
3726 (using_enc ? 0 : value_embedded_offset (argp)));
3727 deprecated_set_value_type (new_val, value_type (argp));
3728 set_value_embedded_offset (new_val, (using_enc
3729 ? top + value_embedded_offset (argp)
3735 /* Return the value of the local variable, if one exists. Throw error
3736 otherwise, such as if the request is made in an inappropriate context. */
3739 value_of_this (const struct language_defn *lang)
3741 struct block_symbol sym;
3742 const struct block *b;
3743 struct frame_info *frame;
3745 if (!lang->la_name_of_this)
3746 error (_("no `this' in current language"));
3748 frame = get_selected_frame (_("no frame selected"));
3750 b = get_frame_block (frame, NULL);
3752 sym = lookup_language_this (lang, b);
3753 if (sym.symbol == NULL)
3754 error (_("current stack frame does not contain a variable named `%s'"),
3755 lang->la_name_of_this);
3757 return read_var_value (sym.symbol, sym.block, frame);
3760 /* Return the value of the local variable, if one exists. Return NULL
3761 otherwise. Never throw error. */
3764 value_of_this_silent (const struct language_defn *lang)
3766 struct value *ret = NULL;
3770 ret = value_of_this (lang);
3772 CATCH (except, RETURN_MASK_ERROR)
3780 /* Create a slice (sub-string, sub-array) of ARRAY, that is LENGTH
3781 elements long, starting at LOWBOUND. The result has the same lower
3782 bound as the original ARRAY. */
3785 value_slice (struct value *array, int lowbound, int length)
3787 struct type *slice_range_type, *slice_type, *range_type;
3788 LONGEST lowerbound, upperbound;
3789 struct value *slice;
3790 struct type *array_type;
3792 array_type = check_typedef (value_type (array));
3793 if (TYPE_CODE (array_type) != TYPE_CODE_ARRAY
3794 && TYPE_CODE (array_type) != TYPE_CODE_STRING)
3795 error (_("cannot take slice of non-array"));
3797 range_type = TYPE_INDEX_TYPE (array_type);
3798 if (get_discrete_bounds (range_type, &lowerbound, &upperbound) < 0)
3799 error (_("slice from bad array or bitstring"));
3801 if (lowbound < lowerbound || length < 0
3802 || lowbound + length - 1 > upperbound)
3803 error (_("slice out of range"));
3805 /* FIXME-type-allocation: need a way to free this type when we are
3807 slice_range_type = create_static_range_type ((struct type *) NULL,
3808 TYPE_TARGET_TYPE (range_type),
3810 lowbound + length - 1);
3813 struct type *element_type = TYPE_TARGET_TYPE (array_type);
3815 = (lowbound - lowerbound) * TYPE_LENGTH (check_typedef (element_type));
3817 slice_type = create_array_type ((struct type *) NULL,
3820 TYPE_CODE (slice_type) = TYPE_CODE (array_type);
3822 if (VALUE_LVAL (array) == lval_memory && value_lazy (array))
3823 slice = allocate_value_lazy (slice_type);
3826 slice = allocate_value (slice_type);
3827 value_contents_copy (slice, 0, array, offset,
3828 type_length_units (slice_type));
3831 set_value_component_location (slice, array);
3832 set_value_offset (slice, value_offset (array) + offset);
3838 /* Create a value for a FORTRAN complex number. Currently most of the
3839 time values are coerced to COMPLEX*16 (i.e. a complex number
3840 composed of 2 doubles. This really should be a smarter routine
3841 that figures out precision inteligently as opposed to assuming
3842 doubles. FIXME: fmb */
3845 value_literal_complex (struct value *arg1,
3850 struct type *real_type = TYPE_TARGET_TYPE (type);
3852 val = allocate_value (type);
3853 arg1 = value_cast (real_type, arg1);
3854 arg2 = value_cast (real_type, arg2);
3856 memcpy (value_contents_raw (val),
3857 value_contents (arg1), TYPE_LENGTH (real_type));
3858 memcpy (value_contents_raw (val) + TYPE_LENGTH (real_type),
3859 value_contents (arg2), TYPE_LENGTH (real_type));
3863 /* Cast a value into the appropriate complex data type. */
3865 static struct value *
3866 cast_into_complex (struct type *type, struct value *val)
3868 struct type *real_type = TYPE_TARGET_TYPE (type);
3870 if (TYPE_CODE (value_type (val)) == TYPE_CODE_COMPLEX)
3872 struct type *val_real_type = TYPE_TARGET_TYPE (value_type (val));
3873 struct value *re_val = allocate_value (val_real_type);
3874 struct value *im_val = allocate_value (val_real_type);
3876 memcpy (value_contents_raw (re_val),
3877 value_contents (val), TYPE_LENGTH (val_real_type));
3878 memcpy (value_contents_raw (im_val),
3879 value_contents (val) + TYPE_LENGTH (val_real_type),
3880 TYPE_LENGTH (val_real_type));
3882 return value_literal_complex (re_val, im_val, type);
3884 else if (TYPE_CODE (value_type (val)) == TYPE_CODE_FLT
3885 || TYPE_CODE (value_type (val)) == TYPE_CODE_INT)
3886 return value_literal_complex (val,
3887 value_zero (real_type, not_lval),
3890 error (_("cannot cast non-number to complex"));
3894 _initialize_valops (void)
3896 add_setshow_boolean_cmd ("overload-resolution", class_support,
3897 &overload_resolution, _("\
3898 Set overload resolution in evaluating C++ functions."), _("\
3899 Show overload resolution in evaluating C++ functions."),
3901 show_overload_resolution,
3902 &setlist, &showlist);
3903 overload_resolution = 1;