1 /* Perform non-arithmetic operations on values, for GDB.
3 Copyright (C) 1986-2019 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"
37 #include "target-float.h"
38 #include "tracepoint.h"
39 #include "observable.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 (gdb::array_view
<value
*> args
,
58 const char *, const char *,
59 std::vector
<symbol
*> *oload_syms
,
63 static int find_oload_champ_namespace_loop (gdb::array_view
<value
*> args
,
64 const char *, const char *,
65 int, std::vector
<symbol
*> *oload_syms
,
66 badness_vector
*, int *,
69 static int find_oload_champ (gdb::array_view
<value
*> args
,
72 xmethod_worker_up
*xmethods
,
74 badness_vector
*oload_champ_bv
);
76 static int oload_method_static_p (struct fn_field
*, int);
78 enum oload_classification
{ STANDARD
, NON_STANDARD
, INCOMPATIBLE
};
80 static enum oload_classification classify_oload_match
81 (const badness_vector
&, int, int);
83 static struct value
*value_struct_elt_for_reference (struct type
*,
89 static struct value
*value_namespace_elt (const struct type
*,
90 const char *, int , enum noside
);
92 static struct value
*value_maybe_namespace_elt (const struct type
*,
96 static CORE_ADDR
allocate_space_in_inferior (int);
98 static struct value
*cast_into_complex (struct type
*, struct value
*);
100 int overload_resolution
= 0;
102 show_overload_resolution (struct ui_file
*file
, int from_tty
,
103 struct cmd_list_element
*c
,
106 fprintf_filtered (file
, _("Overload resolution in evaluating "
107 "C++ functions is %s.\n"),
111 /* Find the address of function name NAME in the inferior. If OBJF_P
112 is non-NULL, *OBJF_P will be set to the OBJFILE where the function
116 find_function_in_inferior (const char *name
, struct objfile
**objf_p
)
118 struct block_symbol sym
;
120 sym
= lookup_symbol (name
, 0, VAR_DOMAIN
, 0);
121 if (sym
.symbol
!= NULL
)
123 if (SYMBOL_CLASS (sym
.symbol
) != LOC_BLOCK
)
125 error (_("\"%s\" exists in this program but is not a function."),
130 *objf_p
= symbol_objfile (sym
.symbol
);
132 return value_of_variable (sym
.symbol
, sym
.block
);
136 struct bound_minimal_symbol msymbol
=
137 lookup_bound_minimal_symbol (name
);
139 if (msymbol
.minsym
!= NULL
)
141 struct objfile
*objfile
= msymbol
.objfile
;
142 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
146 type
= lookup_pointer_type (builtin_type (gdbarch
)->builtin_char
);
147 type
= lookup_function_type (type
);
148 type
= lookup_pointer_type (type
);
149 maddr
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
154 return value_from_pointer (type
, maddr
);
158 if (!target_has_execution
)
159 error (_("evaluation of this expression "
160 "requires the target program to be active"));
162 error (_("evaluation of this expression requires the "
163 "program to have a function \"%s\"."),
169 /* Allocate NBYTES of space in the inferior using the inferior's
170 malloc and return a value that is a pointer to the allocated
174 value_allocate_space_in_inferior (int len
)
176 struct objfile
*objf
;
177 struct value
*val
= find_function_in_inferior ("malloc", &objf
);
178 struct gdbarch
*gdbarch
= get_objfile_arch (objf
);
179 struct value
*blocklen
;
181 blocklen
= value_from_longest (builtin_type (gdbarch
)->builtin_int
, len
);
182 val
= call_function_by_hand (val
, NULL
, blocklen
);
183 if (value_logical_not (val
))
185 if (!target_has_execution
)
186 error (_("No memory available to program now: "
187 "you need to start the target first"));
189 error (_("No memory available to program: call to malloc failed"));
195 allocate_space_in_inferior (int len
)
197 return value_as_long (value_allocate_space_in_inferior (len
));
200 /* Cast struct value VAL to type TYPE and return as a value.
201 Both type and val must be of TYPE_CODE_STRUCT or TYPE_CODE_UNION
202 for this to work. Typedef to one of the codes is permitted.
203 Returns NULL if the cast is neither an upcast nor a downcast. */
205 static struct value
*
206 value_cast_structs (struct type
*type
, struct value
*v2
)
212 gdb_assert (type
!= NULL
&& v2
!= NULL
);
214 t1
= check_typedef (type
);
215 t2
= check_typedef (value_type (v2
));
217 /* Check preconditions. */
218 gdb_assert ((TYPE_CODE (t1
) == TYPE_CODE_STRUCT
219 || TYPE_CODE (t1
) == TYPE_CODE_UNION
)
220 && !!"Precondition is that type is of STRUCT or UNION kind.");
221 gdb_assert ((TYPE_CODE (t2
) == TYPE_CODE_STRUCT
222 || TYPE_CODE (t2
) == TYPE_CODE_UNION
)
223 && !!"Precondition is that value is of STRUCT or UNION kind");
225 if (TYPE_NAME (t1
) != NULL
226 && TYPE_NAME (t2
) != NULL
227 && !strcmp (TYPE_NAME (t1
), TYPE_NAME (t2
)))
230 /* Upcasting: look in the type of the source to see if it contains the
231 type of the target as a superclass. If so, we'll need to
232 offset the pointer rather than just change its type. */
233 if (TYPE_NAME (t1
) != NULL
)
235 v
= search_struct_field (TYPE_NAME (t1
),
241 /* Downcasting: look in the type of the target to see if it contains the
242 type of the source as a superclass. If so, we'll need to
243 offset the pointer rather than just change its type. */
244 if (TYPE_NAME (t2
) != NULL
)
246 /* Try downcasting using the run-time type of the value. */
249 struct type
*real_type
;
251 real_type
= value_rtti_type (v2
, &full
, &top
, &using_enc
);
254 v
= value_full_object (v2
, real_type
, full
, top
, using_enc
);
255 v
= value_at_lazy (real_type
, value_address (v
));
256 real_type
= value_type (v
);
258 /* We might be trying to cast to the outermost enclosing
259 type, in which case search_struct_field won't work. */
260 if (TYPE_NAME (real_type
) != NULL
261 && !strcmp (TYPE_NAME (real_type
), TYPE_NAME (t1
)))
264 v
= search_struct_field (TYPE_NAME (t2
), v
, real_type
, 1);
269 /* Try downcasting using information from the destination type
270 T2. This wouldn't work properly for classes with virtual
271 bases, but those were handled above. */
272 v
= search_struct_field (TYPE_NAME (t2
),
273 value_zero (t1
, not_lval
), t1
, 1);
276 /* Downcasting is possible (t1 is superclass of v2). */
277 CORE_ADDR addr2
= value_address (v2
);
279 addr2
-= value_address (v
) + value_embedded_offset (v
);
280 return value_at (type
, addr2
);
287 /* Cast one pointer or reference type to another. Both TYPE and
288 the type of ARG2 should be pointer types, or else both should be
289 reference types. If SUBCLASS_CHECK is non-zero, this will force a
290 check to see whether TYPE is a superclass of ARG2's type. If
291 SUBCLASS_CHECK is zero, then the subclass check is done only when
292 ARG2 is itself non-zero. Returns the new pointer or reference. */
295 value_cast_pointers (struct type
*type
, struct value
*arg2
,
298 struct type
*type1
= check_typedef (type
);
299 struct type
*type2
= check_typedef (value_type (arg2
));
300 struct type
*t1
= check_typedef (TYPE_TARGET_TYPE (type1
));
301 struct type
*t2
= check_typedef (TYPE_TARGET_TYPE (type2
));
303 if (TYPE_CODE (t1
) == TYPE_CODE_STRUCT
304 && TYPE_CODE (t2
) == TYPE_CODE_STRUCT
305 && (subclass_check
|| !value_logical_not (arg2
)))
309 if (TYPE_IS_REFERENCE (type2
))
310 v2
= coerce_ref (arg2
);
312 v2
= value_ind (arg2
);
313 gdb_assert (TYPE_CODE (check_typedef (value_type (v2
)))
314 == TYPE_CODE_STRUCT
&& !!"Why did coercion fail?");
315 v2
= value_cast_structs (t1
, v2
);
316 /* At this point we have what we can have, un-dereference if needed. */
319 struct value
*v
= value_addr (v2
);
321 deprecated_set_value_type (v
, type
);
326 /* No superclass found, just change the pointer type. */
327 arg2
= value_copy (arg2
);
328 deprecated_set_value_type (arg2
, type
);
329 set_value_enclosing_type (arg2
, type
);
330 set_value_pointed_to_offset (arg2
, 0); /* pai: chk_val */
334 /* Cast value ARG2 to type TYPE and return as a value.
335 More general than a C cast: accepts any two types of the same length,
336 and if ARG2 is an lvalue it can be cast into anything at all. */
337 /* In C++, casts may change pointer or object representations. */
340 value_cast (struct type
*type
, struct value
*arg2
)
342 enum type_code code1
;
343 enum type_code code2
;
347 int convert_to_boolean
= 0;
349 if (value_type (arg2
) == type
)
352 /* Check if we are casting struct reference to struct reference. */
353 if (TYPE_IS_REFERENCE (check_typedef (type
)))
355 /* We dereference type; then we recurse and finally
356 we generate value of the given reference. Nothing wrong with
358 struct type
*t1
= check_typedef (type
);
359 struct type
*dereftype
= check_typedef (TYPE_TARGET_TYPE (t1
));
360 struct value
*val
= value_cast (dereftype
, arg2
);
362 return value_ref (val
, TYPE_CODE (t1
));
365 if (TYPE_IS_REFERENCE (check_typedef (value_type (arg2
))))
366 /* We deref the value and then do the cast. */
367 return value_cast (type
, coerce_ref (arg2
));
369 /* Strip typedefs / resolve stubs in order to get at the type's
370 code/length, but remember the original type, to use as the
371 resulting type of the cast, in case it was a typedef. */
372 struct type
*to_type
= type
;
374 type
= check_typedef (type
);
375 code1
= TYPE_CODE (type
);
376 arg2
= coerce_ref (arg2
);
377 type2
= check_typedef (value_type (arg2
));
379 /* You can't cast to a reference type. See value_cast_pointers
381 gdb_assert (!TYPE_IS_REFERENCE (type
));
383 /* A cast to an undetermined-length array_type, such as
384 (TYPE [])OBJECT, is treated like a cast to (TYPE [N])OBJECT,
385 where N is sizeof(OBJECT)/sizeof(TYPE). */
386 if (code1
== TYPE_CODE_ARRAY
)
388 struct type
*element_type
= TYPE_TARGET_TYPE (type
);
389 unsigned element_length
= TYPE_LENGTH (check_typedef (element_type
));
391 if (element_length
> 0 && TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type
))
393 struct type
*range_type
= TYPE_INDEX_TYPE (type
);
394 int val_length
= TYPE_LENGTH (type2
);
395 LONGEST low_bound
, high_bound
, new_length
;
397 if (get_discrete_bounds (range_type
, &low_bound
, &high_bound
) < 0)
398 low_bound
= 0, high_bound
= 0;
399 new_length
= val_length
/ element_length
;
400 if (val_length
% element_length
!= 0)
401 warning (_("array element type size does not "
402 "divide object size in cast"));
403 /* FIXME-type-allocation: need a way to free this type when
404 we are done with it. */
405 range_type
= create_static_range_type ((struct type
*) NULL
,
406 TYPE_TARGET_TYPE (range_type
),
408 new_length
+ low_bound
- 1);
409 deprecated_set_value_type (arg2
,
410 create_array_type ((struct type
*) NULL
,
417 if (current_language
->c_style_arrays
418 && TYPE_CODE (type2
) == TYPE_CODE_ARRAY
419 && !TYPE_VECTOR (type2
))
420 arg2
= value_coerce_array (arg2
);
422 if (TYPE_CODE (type2
) == TYPE_CODE_FUNC
)
423 arg2
= value_coerce_function (arg2
);
425 type2
= check_typedef (value_type (arg2
));
426 code2
= TYPE_CODE (type2
);
428 if (code1
== TYPE_CODE_COMPLEX
)
429 return cast_into_complex (to_type
, arg2
);
430 if (code1
== TYPE_CODE_BOOL
)
432 code1
= TYPE_CODE_INT
;
433 convert_to_boolean
= 1;
435 if (code1
== TYPE_CODE_CHAR
)
436 code1
= TYPE_CODE_INT
;
437 if (code2
== TYPE_CODE_BOOL
|| code2
== TYPE_CODE_CHAR
)
438 code2
= TYPE_CODE_INT
;
440 scalar
= (code2
== TYPE_CODE_INT
|| code2
== TYPE_CODE_FLT
441 || code2
== TYPE_CODE_DECFLOAT
|| code2
== TYPE_CODE_ENUM
442 || code2
== TYPE_CODE_RANGE
);
444 if ((code1
== TYPE_CODE_STRUCT
|| code1
== TYPE_CODE_UNION
)
445 && (code2
== TYPE_CODE_STRUCT
|| code2
== TYPE_CODE_UNION
)
446 && TYPE_NAME (type
) != 0)
448 struct value
*v
= value_cast_structs (to_type
, arg2
);
454 if (is_floating_type (type
) && scalar
)
456 if (is_floating_value (arg2
))
458 struct value
*v
= allocate_value (to_type
);
459 target_float_convert (value_contents (arg2
), type2
,
460 value_contents_raw (v
), type
);
464 /* The only option left is an integral type. */
465 if (TYPE_UNSIGNED (type2
))
466 return value_from_ulongest (to_type
, value_as_long (arg2
));
468 return value_from_longest (to_type
, value_as_long (arg2
));
470 else if ((code1
== TYPE_CODE_INT
|| code1
== TYPE_CODE_ENUM
471 || code1
== TYPE_CODE_RANGE
)
472 && (scalar
|| code2
== TYPE_CODE_PTR
473 || code2
== TYPE_CODE_MEMBERPTR
))
477 /* When we cast pointers to integers, we mustn't use
478 gdbarch_pointer_to_address to find the address the pointer
479 represents, as value_as_long would. GDB should evaluate
480 expressions just as the compiler would --- and the compiler
481 sees a cast as a simple reinterpretation of the pointer's
483 if (code2
== TYPE_CODE_PTR
)
484 longest
= extract_unsigned_integer
485 (value_contents (arg2
), TYPE_LENGTH (type2
),
486 gdbarch_byte_order (get_type_arch (type2
)));
488 longest
= value_as_long (arg2
);
489 return value_from_longest (to_type
, convert_to_boolean
?
490 (LONGEST
) (longest
? 1 : 0) : longest
);
492 else if (code1
== TYPE_CODE_PTR
&& (code2
== TYPE_CODE_INT
493 || code2
== TYPE_CODE_ENUM
494 || code2
== TYPE_CODE_RANGE
))
496 /* TYPE_LENGTH (type) is the length of a pointer, but we really
497 want the length of an address! -- we are really dealing with
498 addresses (i.e., gdb representations) not pointers (i.e.,
499 target representations) here.
501 This allows things like "print *(int *)0x01000234" to work
502 without printing a misleading message -- which would
503 otherwise occur when dealing with a target having two byte
504 pointers and four byte addresses. */
506 int addr_bit
= gdbarch_addr_bit (get_type_arch (type2
));
507 LONGEST longest
= value_as_long (arg2
);
509 if (addr_bit
< sizeof (LONGEST
) * HOST_CHAR_BIT
)
511 if (longest
>= ((LONGEST
) 1 << addr_bit
)
512 || longest
<= -((LONGEST
) 1 << addr_bit
))
513 warning (_("value truncated"));
515 return value_from_longest (to_type
, longest
);
517 else if (code1
== TYPE_CODE_METHODPTR
&& code2
== TYPE_CODE_INT
518 && value_as_long (arg2
) == 0)
520 struct value
*result
= allocate_value (to_type
);
522 cplus_make_method_ptr (to_type
, value_contents_writeable (result
), 0, 0);
525 else if (code1
== TYPE_CODE_MEMBERPTR
&& code2
== TYPE_CODE_INT
526 && value_as_long (arg2
) == 0)
528 /* The Itanium C++ ABI represents NULL pointers to members as
529 minus one, instead of biasing the normal case. */
530 return value_from_longest (to_type
, -1);
532 else if (code1
== TYPE_CODE_ARRAY
&& TYPE_VECTOR (type
)
533 && code2
== TYPE_CODE_ARRAY
&& TYPE_VECTOR (type2
)
534 && TYPE_LENGTH (type
) != TYPE_LENGTH (type2
))
535 error (_("Cannot convert between vector values of different sizes"));
536 else if (code1
== TYPE_CODE_ARRAY
&& TYPE_VECTOR (type
) && scalar
537 && TYPE_LENGTH (type
) != TYPE_LENGTH (type2
))
538 error (_("can only cast scalar to vector of same size"));
539 else if (code1
== TYPE_CODE_VOID
)
541 return value_zero (to_type
, not_lval
);
543 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (type2
))
545 if (code1
== TYPE_CODE_PTR
&& code2
== TYPE_CODE_PTR
)
546 return value_cast_pointers (to_type
, arg2
, 0);
548 arg2
= value_copy (arg2
);
549 deprecated_set_value_type (arg2
, to_type
);
550 set_value_enclosing_type (arg2
, to_type
);
551 set_value_pointed_to_offset (arg2
, 0); /* pai: chk_val */
554 else if (VALUE_LVAL (arg2
) == lval_memory
)
555 return value_at_lazy (to_type
, value_address (arg2
));
558 error (_("Invalid cast."));
563 /* The C++ reinterpret_cast operator. */
566 value_reinterpret_cast (struct type
*type
, struct value
*arg
)
568 struct value
*result
;
569 struct type
*real_type
= check_typedef (type
);
570 struct type
*arg_type
, *dest_type
;
572 enum type_code dest_code
, arg_code
;
574 /* Do reference, function, and array conversion. */
575 arg
= coerce_array (arg
);
577 /* Attempt to preserve the type the user asked for. */
580 /* If we are casting to a reference type, transform
581 reinterpret_cast<T&[&]>(V) to *reinterpret_cast<T*>(&V). */
582 if (TYPE_IS_REFERENCE (real_type
))
585 arg
= value_addr (arg
);
586 dest_type
= lookup_pointer_type (TYPE_TARGET_TYPE (dest_type
));
587 real_type
= lookup_pointer_type (real_type
);
590 arg_type
= value_type (arg
);
592 dest_code
= TYPE_CODE (real_type
);
593 arg_code
= TYPE_CODE (arg_type
);
595 /* We can convert pointer types, or any pointer type to int, or int
597 if ((dest_code
== TYPE_CODE_PTR
&& arg_code
== TYPE_CODE_INT
)
598 || (dest_code
== TYPE_CODE_INT
&& arg_code
== TYPE_CODE_PTR
)
599 || (dest_code
== TYPE_CODE_METHODPTR
&& arg_code
== TYPE_CODE_INT
)
600 || (dest_code
== TYPE_CODE_INT
&& arg_code
== TYPE_CODE_METHODPTR
)
601 || (dest_code
== TYPE_CODE_MEMBERPTR
&& arg_code
== TYPE_CODE_INT
)
602 || (dest_code
== TYPE_CODE_INT
&& arg_code
== TYPE_CODE_MEMBERPTR
)
603 || (dest_code
== arg_code
604 && (dest_code
== TYPE_CODE_PTR
605 || dest_code
== TYPE_CODE_METHODPTR
606 || dest_code
== TYPE_CODE_MEMBERPTR
)))
607 result
= value_cast (dest_type
, arg
);
609 error (_("Invalid reinterpret_cast"));
612 result
= value_cast (type
, value_ref (value_ind (result
),
618 /* A helper for value_dynamic_cast. This implements the first of two
619 runtime checks: we iterate over all the base classes of the value's
620 class which are equal to the desired class; if only one of these
621 holds the value, then it is the answer. */
624 dynamic_cast_check_1 (struct type
*desired_type
,
625 const gdb_byte
*valaddr
,
626 LONGEST embedded_offset
,
629 struct type
*search_type
,
631 struct type
*arg_type
,
632 struct value
**result
)
634 int i
, result_count
= 0;
636 for (i
= 0; i
< TYPE_N_BASECLASSES (search_type
) && result_count
< 2; ++i
)
638 LONGEST offset
= baseclass_offset (search_type
, i
, valaddr
,
642 if (class_types_same_p (desired_type
, TYPE_BASECLASS (search_type
, i
)))
644 if (address
+ embedded_offset
+ offset
>= arg_addr
645 && address
+ embedded_offset
+ offset
< arg_addr
+ TYPE_LENGTH (arg_type
))
649 *result
= value_at_lazy (TYPE_BASECLASS (search_type
, i
),
650 address
+ embedded_offset
+ offset
);
654 result_count
+= dynamic_cast_check_1 (desired_type
,
656 embedded_offset
+ offset
,
658 TYPE_BASECLASS (search_type
, i
),
667 /* A helper for value_dynamic_cast. This implements the second of two
668 runtime checks: we look for a unique public sibling class of the
669 argument's declared class. */
672 dynamic_cast_check_2 (struct type
*desired_type
,
673 const gdb_byte
*valaddr
,
674 LONGEST embedded_offset
,
677 struct type
*search_type
,
678 struct value
**result
)
680 int i
, result_count
= 0;
682 for (i
= 0; i
< TYPE_N_BASECLASSES (search_type
) && result_count
< 2; ++i
)
686 if (! BASETYPE_VIA_PUBLIC (search_type
, i
))
689 offset
= baseclass_offset (search_type
, i
, valaddr
, embedded_offset
,
691 if (class_types_same_p (desired_type
, TYPE_BASECLASS (search_type
, i
)))
695 *result
= value_at_lazy (TYPE_BASECLASS (search_type
, i
),
696 address
+ embedded_offset
+ offset
);
699 result_count
+= dynamic_cast_check_2 (desired_type
,
701 embedded_offset
+ offset
,
703 TYPE_BASECLASS (search_type
, i
),
710 /* The C++ dynamic_cast operator. */
713 value_dynamic_cast (struct type
*type
, struct value
*arg
)
717 struct type
*resolved_type
= check_typedef (type
);
718 struct type
*arg_type
= check_typedef (value_type (arg
));
719 struct type
*class_type
, *rtti_type
;
720 struct value
*result
, *tem
, *original_arg
= arg
;
722 int is_ref
= TYPE_IS_REFERENCE (resolved_type
);
724 if (TYPE_CODE (resolved_type
) != TYPE_CODE_PTR
725 && !TYPE_IS_REFERENCE (resolved_type
))
726 error (_("Argument to dynamic_cast must be a pointer or reference type"));
727 if (TYPE_CODE (TYPE_TARGET_TYPE (resolved_type
)) != TYPE_CODE_VOID
728 && TYPE_CODE (TYPE_TARGET_TYPE (resolved_type
)) != TYPE_CODE_STRUCT
)
729 error (_("Argument to dynamic_cast must be pointer to class or `void *'"));
731 class_type
= check_typedef (TYPE_TARGET_TYPE (resolved_type
));
732 if (TYPE_CODE (resolved_type
) == TYPE_CODE_PTR
)
734 if (TYPE_CODE (arg_type
) != TYPE_CODE_PTR
735 && ! (TYPE_CODE (arg_type
) == TYPE_CODE_INT
736 && value_as_long (arg
) == 0))
737 error (_("Argument to dynamic_cast does not have pointer type"));
738 if (TYPE_CODE (arg_type
) == TYPE_CODE_PTR
)
740 arg_type
= check_typedef (TYPE_TARGET_TYPE (arg_type
));
741 if (TYPE_CODE (arg_type
) != TYPE_CODE_STRUCT
)
742 error (_("Argument to dynamic_cast does "
743 "not have pointer to class type"));
746 /* Handle NULL pointers. */
747 if (value_as_long (arg
) == 0)
748 return value_zero (type
, not_lval
);
750 arg
= value_ind (arg
);
754 if (TYPE_CODE (arg_type
) != TYPE_CODE_STRUCT
)
755 error (_("Argument to dynamic_cast does not have class type"));
758 /* If the classes are the same, just return the argument. */
759 if (class_types_same_p (class_type
, arg_type
))
760 return value_cast (type
, arg
);
762 /* If the target type is a unique base class of the argument's
763 declared type, just cast it. */
764 if (is_ancestor (class_type
, arg_type
))
766 if (is_unique_ancestor (class_type
, arg
))
767 return value_cast (type
, original_arg
);
768 error (_("Ambiguous dynamic_cast"));
771 rtti_type
= value_rtti_type (arg
, &full
, &top
, &using_enc
);
773 error (_("Couldn't determine value's most derived type for dynamic_cast"));
775 /* Compute the most derived object's address. */
776 addr
= value_address (arg
);
784 addr
+= top
+ value_embedded_offset (arg
);
786 /* dynamic_cast<void *> means to return a pointer to the
787 most-derived object. */
788 if (TYPE_CODE (resolved_type
) == TYPE_CODE_PTR
789 && TYPE_CODE (TYPE_TARGET_TYPE (resolved_type
)) == TYPE_CODE_VOID
)
790 return value_at_lazy (type
, addr
);
792 tem
= value_at (type
, addr
);
793 type
= value_type (tem
);
795 /* The first dynamic check specified in 5.2.7. */
796 if (is_public_ancestor (arg_type
, TYPE_TARGET_TYPE (resolved_type
)))
798 if (class_types_same_p (rtti_type
, TYPE_TARGET_TYPE (resolved_type
)))
801 if (dynamic_cast_check_1 (TYPE_TARGET_TYPE (resolved_type
),
802 value_contents_for_printing (tem
),
803 value_embedded_offset (tem
),
804 value_address (tem
), tem
,
808 return value_cast (type
,
810 ? value_ref (result
, TYPE_CODE (resolved_type
))
811 : value_addr (result
));
814 /* The second dynamic check specified in 5.2.7. */
816 if (is_public_ancestor (arg_type
, rtti_type
)
817 && dynamic_cast_check_2 (TYPE_TARGET_TYPE (resolved_type
),
818 value_contents_for_printing (tem
),
819 value_embedded_offset (tem
),
820 value_address (tem
), tem
,
821 rtti_type
, &result
) == 1)
822 return value_cast (type
,
824 ? value_ref (result
, TYPE_CODE (resolved_type
))
825 : value_addr (result
));
827 if (TYPE_CODE (resolved_type
) == TYPE_CODE_PTR
)
828 return value_zero (type
, not_lval
);
830 error (_("dynamic_cast failed"));
833 /* Create a value of type TYPE that is zero, and return it. */
836 value_zero (struct type
*type
, enum lval_type lv
)
838 struct value
*val
= allocate_value (type
);
840 VALUE_LVAL (val
) = (lv
== lval_computed
? not_lval
: lv
);
844 /* Create a not_lval value of numeric type TYPE that is one, and return it. */
847 value_one (struct type
*type
)
849 struct type
*type1
= check_typedef (type
);
852 if (is_integral_type (type1
) || is_floating_type (type1
))
854 val
= value_from_longest (type
, (LONGEST
) 1);
856 else if (TYPE_CODE (type1
) == TYPE_CODE_ARRAY
&& TYPE_VECTOR (type1
))
858 struct type
*eltype
= check_typedef (TYPE_TARGET_TYPE (type1
));
860 LONGEST low_bound
, high_bound
;
863 if (!get_array_bounds (type1
, &low_bound
, &high_bound
))
864 error (_("Could not determine the vector bounds"));
866 val
= allocate_value (type
);
867 for (i
= 0; i
< high_bound
- low_bound
+ 1; i
++)
869 tmp
= value_one (eltype
);
870 memcpy (value_contents_writeable (val
) + i
* TYPE_LENGTH (eltype
),
871 value_contents_all (tmp
), TYPE_LENGTH (eltype
));
876 error (_("Not a numeric type."));
879 /* value_one result is never used for assignments to. */
880 gdb_assert (VALUE_LVAL (val
) == not_lval
);
885 /* Helper function for value_at, value_at_lazy, and value_at_lazy_stack.
886 The type of the created value may differ from the passed type TYPE.
887 Make sure to retrieve the returned values's new type after this call
888 e.g. in case the type is a variable length array. */
890 static struct value
*
891 get_value_at (struct type
*type
, CORE_ADDR addr
, int lazy
)
895 if (TYPE_CODE (check_typedef (type
)) == TYPE_CODE_VOID
)
896 error (_("Attempt to dereference a generic pointer."));
898 val
= value_from_contents_and_address (type
, NULL
, addr
);
901 value_fetch_lazy (val
);
906 /* Return a value with type TYPE located at ADDR.
908 Call value_at only if the data needs to be fetched immediately;
909 if we can be 'lazy' and defer the fetch, perhaps indefinately, call
910 value_at_lazy instead. value_at_lazy simply records the address of
911 the data and sets the lazy-evaluation-required flag. The lazy flag
912 is tested in the value_contents macro, which is used if and when
913 the contents are actually required. The type of the created value
914 may differ from the passed type TYPE. Make sure to retrieve the
915 returned values's new type after this call e.g. in case the type
916 is a variable length array.
918 Note: value_at does *NOT* handle embedded offsets; perform such
919 adjustments before or after calling it. */
922 value_at (struct type
*type
, CORE_ADDR addr
)
924 return get_value_at (type
, addr
, 0);
927 /* Return a lazy value with type TYPE located at ADDR (cf. value_at).
928 The type of the created value may differ from the passed type TYPE.
929 Make sure to retrieve the returned values's new type after this call
930 e.g. in case the type is a variable length array. */
933 value_at_lazy (struct type
*type
, CORE_ADDR addr
)
935 return get_value_at (type
, addr
, 1);
939 read_value_memory (struct value
*val
, LONGEST bit_offset
,
940 int stack
, CORE_ADDR memaddr
,
941 gdb_byte
*buffer
, size_t length
)
943 ULONGEST xfered_total
= 0;
944 struct gdbarch
*arch
= get_value_arch (val
);
945 int unit_size
= gdbarch_addressable_memory_unit_size (arch
);
946 enum target_object object
;
948 object
= stack
? TARGET_OBJECT_STACK_MEMORY
: TARGET_OBJECT_MEMORY
;
950 while (xfered_total
< length
)
952 enum target_xfer_status status
;
953 ULONGEST xfered_partial
;
955 status
= target_xfer_partial (current_top_target (),
957 buffer
+ xfered_total
* unit_size
, NULL
,
958 memaddr
+ xfered_total
,
959 length
- xfered_total
,
962 if (status
== TARGET_XFER_OK
)
964 else if (status
== TARGET_XFER_UNAVAILABLE
)
965 mark_value_bits_unavailable (val
, (xfered_total
* HOST_CHAR_BIT
967 xfered_partial
* HOST_CHAR_BIT
);
968 else if (status
== TARGET_XFER_EOF
)
969 memory_error (TARGET_XFER_E_IO
, memaddr
+ xfered_total
);
971 memory_error (status
, memaddr
+ xfered_total
);
973 xfered_total
+= xfered_partial
;
978 /* Store the contents of FROMVAL into the location of TOVAL.
979 Return a new value with the location of TOVAL and contents of FROMVAL. */
982 value_assign (struct value
*toval
, struct value
*fromval
)
986 struct frame_id old_frame
;
988 if (!deprecated_value_modifiable (toval
))
989 error (_("Left operand of assignment is not a modifiable lvalue."));
991 toval
= coerce_ref (toval
);
993 type
= value_type (toval
);
994 if (VALUE_LVAL (toval
) != lval_internalvar
)
995 fromval
= value_cast (type
, fromval
);
998 /* Coerce arrays and functions to pointers, except for arrays
999 which only live in GDB's storage. */
1000 if (!value_must_coerce_to_target (fromval
))
1001 fromval
= coerce_array (fromval
);
1004 type
= check_typedef (type
);
1006 /* Since modifying a register can trash the frame chain, and
1007 modifying memory can trash the frame cache, we save the old frame
1008 and then restore the new frame afterwards. */
1009 old_frame
= get_frame_id (deprecated_safe_get_selected_frame ());
1011 switch (VALUE_LVAL (toval
))
1013 case lval_internalvar
:
1014 set_internalvar (VALUE_INTERNALVAR (toval
), fromval
);
1015 return value_of_internalvar (get_type_arch (type
),
1016 VALUE_INTERNALVAR (toval
));
1018 case lval_internalvar_component
:
1020 LONGEST offset
= value_offset (toval
);
1022 /* Are we dealing with a bitfield?
1024 It is important to mention that `value_parent (toval)' is
1025 non-NULL iff `value_bitsize (toval)' is non-zero. */
1026 if (value_bitsize (toval
))
1028 /* VALUE_INTERNALVAR below refers to the parent value, while
1029 the offset is relative to this parent value. */
1030 gdb_assert (value_parent (value_parent (toval
)) == NULL
);
1031 offset
+= value_offset (value_parent (toval
));
1034 set_internalvar_component (VALUE_INTERNALVAR (toval
),
1036 value_bitpos (toval
),
1037 value_bitsize (toval
),
1044 const gdb_byte
*dest_buffer
;
1045 CORE_ADDR changed_addr
;
1047 gdb_byte buffer
[sizeof (LONGEST
)];
1049 if (value_bitsize (toval
))
1051 struct value
*parent
= value_parent (toval
);
1053 changed_addr
= value_address (parent
) + value_offset (toval
);
1054 changed_len
= (value_bitpos (toval
)
1055 + value_bitsize (toval
)
1056 + HOST_CHAR_BIT
- 1)
1059 /* If we can read-modify-write exactly the size of the
1060 containing type (e.g. short or int) then do so. This
1061 is safer for volatile bitfields mapped to hardware
1063 if (changed_len
< TYPE_LENGTH (type
)
1064 && TYPE_LENGTH (type
) <= (int) sizeof (LONGEST
)
1065 && ((LONGEST
) changed_addr
% TYPE_LENGTH (type
)) == 0)
1066 changed_len
= TYPE_LENGTH (type
);
1068 if (changed_len
> (int) sizeof (LONGEST
))
1069 error (_("Can't handle bitfields which "
1070 "don't fit in a %d bit word."),
1071 (int) sizeof (LONGEST
) * HOST_CHAR_BIT
);
1073 read_memory (changed_addr
, buffer
, changed_len
);
1074 modify_field (type
, buffer
, value_as_long (fromval
),
1075 value_bitpos (toval
), value_bitsize (toval
));
1076 dest_buffer
= buffer
;
1080 changed_addr
= value_address (toval
);
1081 changed_len
= type_length_units (type
);
1082 dest_buffer
= value_contents (fromval
);
1085 write_memory_with_notification (changed_addr
, dest_buffer
, changed_len
);
1091 struct frame_info
*frame
;
1092 struct gdbarch
*gdbarch
;
1095 /* Figure out which frame this is in currently.
1097 We use VALUE_FRAME_ID for obtaining the value's frame id instead of
1098 VALUE_NEXT_FRAME_ID due to requiring a frame which may be passed to
1099 put_frame_register_bytes() below. That function will (eventually)
1100 perform the necessary unwind operation by first obtaining the next
1102 frame
= frame_find_by_id (VALUE_FRAME_ID (toval
));
1104 value_reg
= VALUE_REGNUM (toval
);
1107 error (_("Value being assigned to is no longer active."));
1109 gdbarch
= get_frame_arch (frame
);
1111 if (value_bitsize (toval
))
1113 struct value
*parent
= value_parent (toval
);
1114 LONGEST offset
= value_offset (parent
) + value_offset (toval
);
1116 gdb_byte buffer
[sizeof (LONGEST
)];
1119 changed_len
= (value_bitpos (toval
)
1120 + value_bitsize (toval
)
1121 + HOST_CHAR_BIT
- 1)
1124 if (changed_len
> (int) sizeof (LONGEST
))
1125 error (_("Can't handle bitfields which "
1126 "don't fit in a %d bit word."),
1127 (int) sizeof (LONGEST
) * HOST_CHAR_BIT
);
1129 if (!get_frame_register_bytes (frame
, value_reg
, offset
,
1130 changed_len
, buffer
,
1134 throw_error (OPTIMIZED_OUT_ERROR
,
1135 _("value has been optimized out"));
1137 throw_error (NOT_AVAILABLE_ERROR
,
1138 _("value is not available"));
1141 modify_field (type
, buffer
, value_as_long (fromval
),
1142 value_bitpos (toval
), value_bitsize (toval
));
1144 put_frame_register_bytes (frame
, value_reg
, offset
,
1145 changed_len
, buffer
);
1149 if (gdbarch_convert_register_p (gdbarch
, VALUE_REGNUM (toval
),
1152 /* If TOVAL is a special machine register requiring
1153 conversion of program values to a special raw
1155 gdbarch_value_to_register (gdbarch
, frame
,
1156 VALUE_REGNUM (toval
), type
,
1157 value_contents (fromval
));
1161 put_frame_register_bytes (frame
, value_reg
,
1162 value_offset (toval
),
1164 value_contents (fromval
));
1168 gdb::observers::register_changed
.notify (frame
, value_reg
);
1174 const struct lval_funcs
*funcs
= value_computed_funcs (toval
);
1176 if (funcs
->write
!= NULL
)
1178 funcs
->write (toval
, fromval
);
1185 error (_("Left operand of assignment is not an lvalue."));
1188 /* Assigning to the stack pointer, frame pointer, and other
1189 (architecture and calling convention specific) registers may
1190 cause the frame cache and regcache to be out of date. Assigning to memory
1191 also can. We just do this on all assignments to registers or
1192 memory, for simplicity's sake; I doubt the slowdown matters. */
1193 switch (VALUE_LVAL (toval
))
1199 gdb::observers::target_changed
.notify (current_top_target ());
1201 /* Having destroyed the frame cache, restore the selected
1204 /* FIXME: cagney/2002-11-02: There has to be a better way of
1205 doing this. Instead of constantly saving/restoring the
1206 frame. Why not create a get_selected_frame() function that,
1207 having saved the selected frame's ID can automatically
1208 re-find the previously selected frame automatically. */
1211 struct frame_info
*fi
= frame_find_by_id (old_frame
);
1222 /* If the field does not entirely fill a LONGEST, then zero the sign
1223 bits. If the field is signed, and is negative, then sign
1225 if ((value_bitsize (toval
) > 0)
1226 && (value_bitsize (toval
) < 8 * (int) sizeof (LONGEST
)))
1228 LONGEST fieldval
= value_as_long (fromval
);
1229 LONGEST valmask
= (((ULONGEST
) 1) << value_bitsize (toval
)) - 1;
1231 fieldval
&= valmask
;
1232 if (!TYPE_UNSIGNED (type
)
1233 && (fieldval
& (valmask
^ (valmask
>> 1))))
1234 fieldval
|= ~valmask
;
1236 fromval
= value_from_longest (type
, fieldval
);
1239 /* The return value is a copy of TOVAL so it shares its location
1240 information, but its contents are updated from FROMVAL. This
1241 implies the returned value is not lazy, even if TOVAL was. */
1242 val
= value_copy (toval
);
1243 set_value_lazy (val
, 0);
1244 memcpy (value_contents_raw (val
), value_contents (fromval
),
1245 TYPE_LENGTH (type
));
1247 /* We copy over the enclosing type and pointed-to offset from FROMVAL
1248 in the case of pointer types. For object types, the enclosing type
1249 and embedded offset must *not* be copied: the target object refered
1250 to by TOVAL retains its original dynamic type after assignment. */
1251 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
1253 set_value_enclosing_type (val
, value_enclosing_type (fromval
));
1254 set_value_pointed_to_offset (val
, value_pointed_to_offset (fromval
));
1260 /* Extend a value VAL to COUNT repetitions of its type. */
1263 value_repeat (struct value
*arg1
, int count
)
1267 if (VALUE_LVAL (arg1
) != lval_memory
)
1268 error (_("Only values in memory can be extended with '@'."));
1270 error (_("Invalid number %d of repetitions."), count
);
1272 val
= allocate_repeat_value (value_enclosing_type (arg1
), count
);
1274 VALUE_LVAL (val
) = lval_memory
;
1275 set_value_address (val
, value_address (arg1
));
1277 read_value_memory (val
, 0, value_stack (val
), value_address (val
),
1278 value_contents_all_raw (val
),
1279 type_length_units (value_enclosing_type (val
)));
1285 value_of_variable (struct symbol
*var
, const struct block
*b
)
1287 struct frame_info
*frame
= NULL
;
1289 if (symbol_read_needs_frame (var
))
1290 frame
= get_selected_frame (_("No frame selected."));
1292 return read_var_value (var
, b
, frame
);
1296 address_of_variable (struct symbol
*var
, const struct block
*b
)
1298 struct type
*type
= SYMBOL_TYPE (var
);
1301 /* Evaluate it first; if the result is a memory address, we're fine.
1302 Lazy evaluation pays off here. */
1304 val
= value_of_variable (var
, b
);
1305 type
= value_type (val
);
1307 if ((VALUE_LVAL (val
) == lval_memory
&& value_lazy (val
))
1308 || TYPE_CODE (type
) == TYPE_CODE_FUNC
)
1310 CORE_ADDR addr
= value_address (val
);
1312 return value_from_pointer (lookup_pointer_type (type
), addr
);
1315 /* Not a memory address; check what the problem was. */
1316 switch (VALUE_LVAL (val
))
1320 struct frame_info
*frame
;
1321 const char *regname
;
1323 frame
= frame_find_by_id (VALUE_NEXT_FRAME_ID (val
));
1326 regname
= gdbarch_register_name (get_frame_arch (frame
),
1327 VALUE_REGNUM (val
));
1328 gdb_assert (regname
&& *regname
);
1330 error (_("Address requested for identifier "
1331 "\"%s\" which is in register $%s"),
1332 SYMBOL_PRINT_NAME (var
), regname
);
1337 error (_("Can't take address of \"%s\" which isn't an lvalue."),
1338 SYMBOL_PRINT_NAME (var
));
1345 /* Return one if VAL does not live in target memory, but should in order
1346 to operate on it. Otherwise return zero. */
1349 value_must_coerce_to_target (struct value
*val
)
1351 struct type
*valtype
;
1353 /* The only lval kinds which do not live in target memory. */
1354 if (VALUE_LVAL (val
) != not_lval
1355 && VALUE_LVAL (val
) != lval_internalvar
1356 && VALUE_LVAL (val
) != lval_xcallable
)
1359 valtype
= check_typedef (value_type (val
));
1361 switch (TYPE_CODE (valtype
))
1363 case TYPE_CODE_ARRAY
:
1364 return TYPE_VECTOR (valtype
) ? 0 : 1;
1365 case TYPE_CODE_STRING
:
1372 /* Make sure that VAL lives in target memory if it's supposed to. For
1373 instance, strings are constructed as character arrays in GDB's
1374 storage, and this function copies them to the target. */
1377 value_coerce_to_target (struct value
*val
)
1382 if (!value_must_coerce_to_target (val
))
1385 length
= TYPE_LENGTH (check_typedef (value_type (val
)));
1386 addr
= allocate_space_in_inferior (length
);
1387 write_memory (addr
, value_contents (val
), length
);
1388 return value_at_lazy (value_type (val
), addr
);
1391 /* Given a value which is an array, return a value which is a pointer
1392 to its first element, regardless of whether or not the array has a
1393 nonzero lower bound.
1395 FIXME: A previous comment here indicated that this routine should
1396 be substracting the array's lower bound. It's not clear to me that
1397 this is correct. Given an array subscripting operation, it would
1398 certainly work to do the adjustment here, essentially computing:
1400 (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0])
1402 However I believe a more appropriate and logical place to account
1403 for the lower bound is to do so in value_subscript, essentially
1406 (&array[0] + ((index - lowerbound) * sizeof array[0]))
1408 As further evidence consider what would happen with operations
1409 other than array subscripting, where the caller would get back a
1410 value that had an address somewhere before the actual first element
1411 of the array, and the information about the lower bound would be
1412 lost because of the coercion to pointer type. */
1415 value_coerce_array (struct value
*arg1
)
1417 struct type
*type
= check_typedef (value_type (arg1
));
1419 /* If the user tries to do something requiring a pointer with an
1420 array that has not yet been pushed to the target, then this would
1421 be a good time to do so. */
1422 arg1
= value_coerce_to_target (arg1
);
1424 if (VALUE_LVAL (arg1
) != lval_memory
)
1425 error (_("Attempt to take address of value not located in memory."));
1427 return value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
1428 value_address (arg1
));
1431 /* Given a value which is a function, return a value which is a pointer
1435 value_coerce_function (struct value
*arg1
)
1437 struct value
*retval
;
1439 if (VALUE_LVAL (arg1
) != lval_memory
)
1440 error (_("Attempt to take address of value not located in memory."));
1442 retval
= value_from_pointer (lookup_pointer_type (value_type (arg1
)),
1443 value_address (arg1
));
1447 /* Return a pointer value for the object for which ARG1 is the
1451 value_addr (struct value
*arg1
)
1454 struct type
*type
= check_typedef (value_type (arg1
));
1456 if (TYPE_IS_REFERENCE (type
))
1458 if (value_bits_synthetic_pointer (arg1
, value_embedded_offset (arg1
),
1459 TARGET_CHAR_BIT
* TYPE_LENGTH (type
)))
1460 arg1
= coerce_ref (arg1
);
1463 /* Copy the value, but change the type from (T&) to (T*). We
1464 keep the same location information, which is efficient, and
1465 allows &(&X) to get the location containing the reference.
1466 Do the same to its enclosing type for consistency. */
1467 struct type
*type_ptr
1468 = lookup_pointer_type (TYPE_TARGET_TYPE (type
));
1469 struct type
*enclosing_type
1470 = check_typedef (value_enclosing_type (arg1
));
1471 struct type
*enclosing_type_ptr
1472 = lookup_pointer_type (TYPE_TARGET_TYPE (enclosing_type
));
1474 arg2
= value_copy (arg1
);
1475 deprecated_set_value_type (arg2
, type_ptr
);
1476 set_value_enclosing_type (arg2
, enclosing_type_ptr
);
1481 if (TYPE_CODE (type
) == TYPE_CODE_FUNC
)
1482 return value_coerce_function (arg1
);
1484 /* If this is an array that has not yet been pushed to the target,
1485 then this would be a good time to force it to memory. */
1486 arg1
= value_coerce_to_target (arg1
);
1488 if (VALUE_LVAL (arg1
) != lval_memory
)
1489 error (_("Attempt to take address of value not located in memory."));
1491 /* Get target memory address. */
1492 arg2
= value_from_pointer (lookup_pointer_type (value_type (arg1
)),
1493 (value_address (arg1
)
1494 + value_embedded_offset (arg1
)));
1496 /* This may be a pointer to a base subobject; so remember the
1497 full derived object's type ... */
1498 set_value_enclosing_type (arg2
,
1499 lookup_pointer_type (value_enclosing_type (arg1
)));
1500 /* ... and also the relative position of the subobject in the full
1502 set_value_pointed_to_offset (arg2
, value_embedded_offset (arg1
));
1506 /* Return a reference value for the object for which ARG1 is the
1510 value_ref (struct value
*arg1
, enum type_code refcode
)
1513 struct type
*type
= check_typedef (value_type (arg1
));
1515 gdb_assert (refcode
== TYPE_CODE_REF
|| refcode
== TYPE_CODE_RVALUE_REF
);
1517 if ((TYPE_CODE (type
) == TYPE_CODE_REF
1518 || TYPE_CODE (type
) == TYPE_CODE_RVALUE_REF
)
1519 && TYPE_CODE (type
) == refcode
)
1522 arg2
= value_addr (arg1
);
1523 deprecated_set_value_type (arg2
, lookup_reference_type (type
, refcode
));
1527 /* Given a value of a pointer type, apply the C unary * operator to
1531 value_ind (struct value
*arg1
)
1533 struct type
*base_type
;
1536 arg1
= coerce_array (arg1
);
1538 base_type
= check_typedef (value_type (arg1
));
1540 if (VALUE_LVAL (arg1
) == lval_computed
)
1542 const struct lval_funcs
*funcs
= value_computed_funcs (arg1
);
1544 if (funcs
->indirect
)
1546 struct value
*result
= funcs
->indirect (arg1
);
1553 if (TYPE_CODE (base_type
) == TYPE_CODE_PTR
)
1555 struct type
*enc_type
;
1557 /* We may be pointing to something embedded in a larger object.
1558 Get the real type of the enclosing object. */
1559 enc_type
= check_typedef (value_enclosing_type (arg1
));
1560 enc_type
= TYPE_TARGET_TYPE (enc_type
);
1562 if (TYPE_CODE (check_typedef (enc_type
)) == TYPE_CODE_FUNC
1563 || TYPE_CODE (check_typedef (enc_type
)) == TYPE_CODE_METHOD
)
1564 /* For functions, go through find_function_addr, which knows
1565 how to handle function descriptors. */
1566 arg2
= value_at_lazy (enc_type
,
1567 find_function_addr (arg1
, NULL
));
1569 /* Retrieve the enclosing object pointed to. */
1570 arg2
= value_at_lazy (enc_type
,
1571 (value_as_address (arg1
)
1572 - value_pointed_to_offset (arg1
)));
1574 enc_type
= value_type (arg2
);
1575 return readjust_indirect_value_type (arg2
, enc_type
, base_type
, arg1
);
1578 error (_("Attempt to take contents of a non-pointer value."));
1581 /* Create a value for an array by allocating space in GDB, copying the
1582 data into that space, and then setting up an array value.
1584 The array bounds are set from LOWBOUND and HIGHBOUND, and the array
1585 is populated from the values passed in ELEMVEC.
1587 The element type of the array is inherited from the type of the
1588 first element, and all elements must have the same size (though we
1589 don't currently enforce any restriction on their types). */
1592 value_array (int lowbound
, int highbound
, struct value
**elemvec
)
1596 ULONGEST typelength
;
1598 struct type
*arraytype
;
1600 /* Validate that the bounds are reasonable and that each of the
1601 elements have the same size. */
1603 nelem
= highbound
- lowbound
+ 1;
1606 error (_("bad array bounds (%d, %d)"), lowbound
, highbound
);
1608 typelength
= type_length_units (value_enclosing_type (elemvec
[0]));
1609 for (idx
= 1; idx
< nelem
; idx
++)
1611 if (type_length_units (value_enclosing_type (elemvec
[idx
]))
1614 error (_("array elements must all be the same size"));
1618 arraytype
= lookup_array_range_type (value_enclosing_type (elemvec
[0]),
1619 lowbound
, highbound
);
1621 if (!current_language
->c_style_arrays
)
1623 val
= allocate_value (arraytype
);
1624 for (idx
= 0; idx
< nelem
; idx
++)
1625 value_contents_copy (val
, idx
* typelength
, elemvec
[idx
], 0,
1630 /* Allocate space to store the array, and then initialize it by
1631 copying in each element. */
1633 val
= allocate_value (arraytype
);
1634 for (idx
= 0; idx
< nelem
; idx
++)
1635 value_contents_copy (val
, idx
* typelength
, elemvec
[idx
], 0, typelength
);
1640 value_cstring (const char *ptr
, ssize_t len
, struct type
*char_type
)
1643 int lowbound
= current_language
->string_lower_bound
;
1644 ssize_t highbound
= len
/ TYPE_LENGTH (char_type
);
1645 struct type
*stringtype
1646 = lookup_array_range_type (char_type
, lowbound
, highbound
+ lowbound
- 1);
1648 val
= allocate_value (stringtype
);
1649 memcpy (value_contents_raw (val
), ptr
, len
);
1653 /* Create a value for a string constant by allocating space in the
1654 inferior, copying the data into that space, and returning the
1655 address with type TYPE_CODE_STRING. PTR points to the string
1656 constant data; LEN is number of characters.
1658 Note that string types are like array of char types with a lower
1659 bound of zero and an upper bound of LEN - 1. Also note that the
1660 string may contain embedded null bytes. */
1663 value_string (const char *ptr
, ssize_t len
, struct type
*char_type
)
1666 int lowbound
= current_language
->string_lower_bound
;
1667 ssize_t highbound
= len
/ TYPE_LENGTH (char_type
);
1668 struct type
*stringtype
1669 = lookup_string_range_type (char_type
, lowbound
, highbound
+ lowbound
- 1);
1671 val
= allocate_value (stringtype
);
1672 memcpy (value_contents_raw (val
), ptr
, len
);
1677 /* See if we can pass arguments in T2 to a function which takes
1678 arguments of types T1. T1 is a list of NARGS arguments, and T2 is
1679 a NULL-terminated vector. If some arguments need coercion of some
1680 sort, then the coerced values are written into T2. Return value is
1681 0 if the arguments could be matched, or the position at which they
1684 STATICP is nonzero if the T1 argument list came from a static
1685 member function. T2 will still include the ``this'' pointer, but
1688 For non-static member functions, we ignore the first argument,
1689 which is the type of the instance variable. This is because we
1690 want to handle calls with objects from derived classes. This is
1691 not entirely correct: we should actually check to make sure that a
1692 requested operation is type secure, shouldn't we? FIXME. */
1695 typecmp (int staticp
, int varargs
, int nargs
,
1696 struct field t1
[], struct value
*t2
[])
1701 internal_error (__FILE__
, __LINE__
,
1702 _("typecmp: no argument list"));
1704 /* Skip ``this'' argument if applicable. T2 will always include
1710 (i
< nargs
) && TYPE_CODE (t1
[i
].type
) != TYPE_CODE_VOID
;
1713 struct type
*tt1
, *tt2
;
1718 tt1
= check_typedef (t1
[i
].type
);
1719 tt2
= check_typedef (value_type (t2
[i
]));
1721 if (TYPE_IS_REFERENCE (tt1
)
1722 /* We should be doing hairy argument matching, as below. */
1723 && (TYPE_CODE (check_typedef (TYPE_TARGET_TYPE (tt1
)))
1724 == TYPE_CODE (tt2
)))
1726 if (TYPE_CODE (tt2
) == TYPE_CODE_ARRAY
)
1727 t2
[i
] = value_coerce_array (t2
[i
]);
1729 t2
[i
] = value_ref (t2
[i
], TYPE_CODE (tt1
));
1733 /* djb - 20000715 - Until the new type structure is in the
1734 place, and we can attempt things like implicit conversions,
1735 we need to do this so you can take something like a map<const
1736 char *>, and properly access map["hello"], because the
1737 argument to [] will be a reference to a pointer to a char,
1738 and the argument will be a pointer to a char. */
1739 while (TYPE_IS_REFERENCE (tt1
) || TYPE_CODE (tt1
) == TYPE_CODE_PTR
)
1741 tt1
= check_typedef( TYPE_TARGET_TYPE(tt1
) );
1743 while (TYPE_CODE(tt2
) == TYPE_CODE_ARRAY
1744 || TYPE_CODE(tt2
) == TYPE_CODE_PTR
1745 || TYPE_IS_REFERENCE (tt2
))
1747 tt2
= check_typedef (TYPE_TARGET_TYPE(tt2
));
1749 if (TYPE_CODE (tt1
) == TYPE_CODE (tt2
))
1751 /* Array to pointer is a `trivial conversion' according to the
1754 /* We should be doing much hairier argument matching (see
1755 section 13.2 of the ARM), but as a quick kludge, just check
1756 for the same type code. */
1757 if (TYPE_CODE (t1
[i
].type
) != TYPE_CODE (value_type (t2
[i
])))
1760 if (varargs
|| t2
[i
] == NULL
)
1765 /* Helper class for do_search_struct_field that updates *RESULT_PTR
1766 and *LAST_BOFFSET, and possibly throws an exception if the field
1767 search has yielded ambiguous results. */
1770 update_search_result (struct value
**result_ptr
, struct value
*v
,
1771 LONGEST
*last_boffset
, LONGEST boffset
,
1772 const char *name
, struct type
*type
)
1776 if (*result_ptr
!= NULL
1777 /* The result is not ambiguous if all the classes that are
1778 found occupy the same space. */
1779 && *last_boffset
!= boffset
)
1780 error (_("base class '%s' is ambiguous in type '%s'"),
1781 name
, TYPE_SAFE_NAME (type
));
1783 *last_boffset
= boffset
;
1787 /* A helper for search_struct_field. This does all the work; most
1788 arguments are as passed to search_struct_field. The result is
1789 stored in *RESULT_PTR, which must be initialized to NULL.
1790 OUTERMOST_TYPE is the type of the initial type passed to
1791 search_struct_field; this is used for error reporting when the
1792 lookup is ambiguous. */
1795 do_search_struct_field (const char *name
, struct value
*arg1
, LONGEST offset
,
1796 struct type
*type
, int looking_for_baseclass
,
1797 struct value
**result_ptr
,
1798 LONGEST
*last_boffset
,
1799 struct type
*outermost_type
)
1804 type
= check_typedef (type
);
1805 nbases
= TYPE_N_BASECLASSES (type
);
1807 if (!looking_for_baseclass
)
1808 for (i
= TYPE_NFIELDS (type
) - 1; i
>= nbases
; i
--)
1810 const char *t_field_name
= TYPE_FIELD_NAME (type
, i
);
1812 if (t_field_name
&& (strcmp_iw (t_field_name
, name
) == 0))
1816 if (field_is_static (&TYPE_FIELD (type
, i
)))
1817 v
= value_static_field (type
, i
);
1819 v
= value_primitive_field (arg1
, offset
, i
, type
);
1825 && t_field_name
[0] == '\0')
1827 struct type
*field_type
= TYPE_FIELD_TYPE (type
, i
);
1829 if (TYPE_CODE (field_type
) == TYPE_CODE_UNION
1830 || TYPE_CODE (field_type
) == TYPE_CODE_STRUCT
)
1832 /* Look for a match through the fields of an anonymous
1833 union, or anonymous struct. C++ provides anonymous
1836 In the GNU Chill (now deleted from GDB)
1837 implementation of variant record types, each
1838 <alternative field> has an (anonymous) union type,
1839 each member of the union represents a <variant
1840 alternative>. Each <variant alternative> is
1841 represented as a struct, with a member for each
1844 struct value
*v
= NULL
;
1845 LONGEST new_offset
= offset
;
1847 /* This is pretty gross. In G++, the offset in an
1848 anonymous union is relative to the beginning of the
1849 enclosing struct. In the GNU Chill (now deleted
1850 from GDB) implementation of variant records, the
1851 bitpos is zero in an anonymous union field, so we
1852 have to add the offset of the union here. */
1853 if (TYPE_CODE (field_type
) == TYPE_CODE_STRUCT
1854 || (TYPE_NFIELDS (field_type
) > 0
1855 && TYPE_FIELD_BITPOS (field_type
, 0) == 0))
1856 new_offset
+= TYPE_FIELD_BITPOS (type
, i
) / 8;
1858 do_search_struct_field (name
, arg1
, new_offset
,
1860 looking_for_baseclass
, &v
,
1872 for (i
= 0; i
< nbases
; i
++)
1874 struct value
*v
= NULL
;
1875 struct type
*basetype
= check_typedef (TYPE_BASECLASS (type
, i
));
1876 /* If we are looking for baseclasses, this is what we get when
1877 we hit them. But it could happen that the base part's member
1878 name is not yet filled in. */
1879 int found_baseclass
= (looking_for_baseclass
1880 && TYPE_BASECLASS_NAME (type
, i
) != NULL
1881 && (strcmp_iw (name
,
1882 TYPE_BASECLASS_NAME (type
,
1884 LONGEST boffset
= value_embedded_offset (arg1
) + offset
;
1886 if (BASETYPE_VIA_VIRTUAL (type
, i
))
1890 boffset
= baseclass_offset (type
, i
,
1891 value_contents_for_printing (arg1
),
1892 value_embedded_offset (arg1
) + offset
,
1893 value_address (arg1
),
1896 /* The virtual base class pointer might have been clobbered
1897 by the user program. Make sure that it still points to a
1898 valid memory location. */
1900 boffset
+= value_embedded_offset (arg1
) + offset
;
1902 || boffset
>= TYPE_LENGTH (value_enclosing_type (arg1
)))
1904 CORE_ADDR base_addr
;
1906 base_addr
= value_address (arg1
) + boffset
;
1907 v2
= value_at_lazy (basetype
, base_addr
);
1908 if (target_read_memory (base_addr
,
1909 value_contents_raw (v2
),
1910 TYPE_LENGTH (value_type (v2
))) != 0)
1911 error (_("virtual baseclass botch"));
1915 v2
= value_copy (arg1
);
1916 deprecated_set_value_type (v2
, basetype
);
1917 set_value_embedded_offset (v2
, boffset
);
1920 if (found_baseclass
)
1924 do_search_struct_field (name
, v2
, 0,
1925 TYPE_BASECLASS (type
, i
),
1926 looking_for_baseclass
,
1927 result_ptr
, last_boffset
,
1931 else if (found_baseclass
)
1932 v
= value_primitive_field (arg1
, offset
, i
, type
);
1935 do_search_struct_field (name
, arg1
,
1936 offset
+ TYPE_BASECLASS_BITPOS (type
,
1938 basetype
, looking_for_baseclass
,
1939 result_ptr
, last_boffset
,
1943 update_search_result (result_ptr
, v
, last_boffset
,
1944 boffset
, name
, outermost_type
);
1948 /* Helper function used by value_struct_elt to recurse through
1949 baseclasses. Look for a field NAME in ARG1. Search in it assuming
1950 it has (class) type TYPE. If found, return value, else return NULL.
1952 If LOOKING_FOR_BASECLASS, then instead of looking for struct
1953 fields, look for a baseclass named NAME. */
1955 static struct value
*
1956 search_struct_field (const char *name
, struct value
*arg1
,
1957 struct type
*type
, int looking_for_baseclass
)
1959 struct value
*result
= NULL
;
1960 LONGEST boffset
= 0;
1962 do_search_struct_field (name
, arg1
, 0, type
, looking_for_baseclass
,
1963 &result
, &boffset
, type
);
1967 /* Helper function used by value_struct_elt to recurse through
1968 baseclasses. Look for a field NAME in ARG1. Adjust the address of
1969 ARG1 by OFFSET bytes, and search in it assuming it has (class) type
1972 If found, return value, else if name matched and args not return
1973 (value) -1, else return NULL. */
1975 static struct value
*
1976 search_struct_method (const char *name
, struct value
**arg1p
,
1977 struct value
**args
, LONGEST offset
,
1978 int *static_memfuncp
, struct type
*type
)
1982 int name_matched
= 0;
1983 char dem_opname
[64];
1985 type
= check_typedef (type
);
1986 for (i
= TYPE_NFN_FIELDS (type
) - 1; i
>= 0; i
--)
1988 const char *t_field_name
= TYPE_FN_FIELDLIST_NAME (type
, i
);
1990 /* FIXME! May need to check for ARM demangling here. */
1991 if (startswith (t_field_name
, "__") ||
1992 startswith (t_field_name
, "op") ||
1993 startswith (t_field_name
, "type"))
1995 if (cplus_demangle_opname (t_field_name
, dem_opname
, DMGL_ANSI
))
1996 t_field_name
= dem_opname
;
1997 else if (cplus_demangle_opname (t_field_name
, dem_opname
, 0))
1998 t_field_name
= dem_opname
;
2000 if (t_field_name
&& (strcmp_iw (t_field_name
, name
) == 0))
2002 int j
= TYPE_FN_FIELDLIST_LENGTH (type
, i
) - 1;
2003 struct fn_field
*f
= TYPE_FN_FIELDLIST1 (type
, i
);
2006 check_stub_method_group (type
, i
);
2007 if (j
> 0 && args
== 0)
2008 error (_("cannot resolve overloaded method "
2009 "`%s': no arguments supplied"), name
);
2010 else if (j
== 0 && args
== 0)
2012 v
= value_fn_field (arg1p
, f
, j
, type
, offset
);
2019 if (!typecmp (TYPE_FN_FIELD_STATIC_P (f
, j
),
2020 TYPE_VARARGS (TYPE_FN_FIELD_TYPE (f
, j
)),
2021 TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (f
, j
)),
2022 TYPE_FN_FIELD_ARGS (f
, j
), args
))
2024 if (TYPE_FN_FIELD_VIRTUAL_P (f
, j
))
2025 return value_virtual_fn_field (arg1p
, f
, j
,
2027 if (TYPE_FN_FIELD_STATIC_P (f
, j
)
2029 *static_memfuncp
= 1;
2030 v
= value_fn_field (arg1p
, f
, j
, type
, offset
);
2039 for (i
= TYPE_N_BASECLASSES (type
) - 1; i
>= 0; i
--)
2041 LONGEST base_offset
;
2042 LONGEST this_offset
;
2044 if (BASETYPE_VIA_VIRTUAL (type
, i
))
2046 struct type
*baseclass
= check_typedef (TYPE_BASECLASS (type
, i
));
2047 struct value
*base_val
;
2048 const gdb_byte
*base_valaddr
;
2050 /* The virtual base class pointer might have been
2051 clobbered by the user program. Make sure that it
2052 still points to a valid memory location. */
2054 if (offset
< 0 || offset
>= TYPE_LENGTH (type
))
2058 gdb::byte_vector
tmp (TYPE_LENGTH (baseclass
));
2059 address
= value_address (*arg1p
);
2061 if (target_read_memory (address
+ offset
,
2062 tmp
.data (), TYPE_LENGTH (baseclass
)) != 0)
2063 error (_("virtual baseclass botch"));
2065 base_val
= value_from_contents_and_address (baseclass
,
2068 base_valaddr
= value_contents_for_printing (base_val
);
2074 base_valaddr
= value_contents_for_printing (*arg1p
);
2075 this_offset
= offset
;
2078 base_offset
= baseclass_offset (type
, i
, base_valaddr
,
2079 this_offset
, value_address (base_val
),
2084 base_offset
= TYPE_BASECLASS_BITPOS (type
, i
) / 8;
2086 v
= search_struct_method (name
, arg1p
, args
, base_offset
+ offset
,
2087 static_memfuncp
, TYPE_BASECLASS (type
, i
));
2088 if (v
== (struct value
*) - 1)
2094 /* FIXME-bothner: Why is this commented out? Why is it here? */
2095 /* *arg1p = arg1_tmp; */
2100 return (struct value
*) - 1;
2105 /* Given *ARGP, a value of type (pointer to a)* structure/union,
2106 extract the component named NAME from the ultimate target
2107 structure/union and return it as a value with its appropriate type.
2108 ERR is used in the error message if *ARGP's type is wrong.
2110 C++: ARGS is a list of argument types to aid in the selection of
2111 an appropriate method. Also, handle derived types.
2113 STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location
2114 where the truthvalue of whether the function that was resolved was
2115 a static member function or not is stored.
2117 ERR is an error message to be printed in case the field is not
2121 value_struct_elt (struct value
**argp
, struct value
**args
,
2122 const char *name
, int *static_memfuncp
, const char *err
)
2127 *argp
= coerce_array (*argp
);
2129 t
= check_typedef (value_type (*argp
));
2131 /* Follow pointers until we get to a non-pointer. */
2133 while (TYPE_CODE (t
) == TYPE_CODE_PTR
|| TYPE_IS_REFERENCE (t
))
2135 *argp
= value_ind (*argp
);
2136 /* Don't coerce fn pointer to fn and then back again! */
2137 if (TYPE_CODE (check_typedef (value_type (*argp
))) != TYPE_CODE_FUNC
)
2138 *argp
= coerce_array (*argp
);
2139 t
= check_typedef (value_type (*argp
));
2142 if (TYPE_CODE (t
) != TYPE_CODE_STRUCT
2143 && TYPE_CODE (t
) != TYPE_CODE_UNION
)
2144 error (_("Attempt to extract a component of a value that is not a %s."),
2147 /* Assume it's not, unless we see that it is. */
2148 if (static_memfuncp
)
2149 *static_memfuncp
= 0;
2153 /* if there are no arguments ...do this... */
2155 /* Try as a field first, because if we succeed, there is less
2157 v
= search_struct_field (name
, *argp
, t
, 0);
2161 /* C++: If it was not found as a data field, then try to
2162 return it as a pointer to a method. */
2163 v
= search_struct_method (name
, argp
, args
, 0,
2164 static_memfuncp
, t
);
2166 if (v
== (struct value
*) - 1)
2167 error (_("Cannot take address of method %s."), name
);
2170 if (TYPE_NFN_FIELDS (t
))
2171 error (_("There is no member or method named %s."), name
);
2173 error (_("There is no member named %s."), name
);
2178 v
= search_struct_method (name
, argp
, args
, 0,
2179 static_memfuncp
, t
);
2181 if (v
== (struct value
*) - 1)
2183 error (_("One of the arguments you tried to pass to %s could not "
2184 "be converted to what the function wants."), name
);
2188 /* See if user tried to invoke data as function. If so, hand it
2189 back. If it's not callable (i.e., a pointer to function),
2190 gdb should give an error. */
2191 v
= search_struct_field (name
, *argp
, t
, 0);
2192 /* If we found an ordinary field, then it is not a method call.
2193 So, treat it as if it were a static member function. */
2194 if (v
&& static_memfuncp
)
2195 *static_memfuncp
= 1;
2199 throw_error (NOT_FOUND_ERROR
,
2200 _("Structure has no component named %s."), name
);
2204 /* Given *ARGP, a value of type structure or union, or a pointer/reference
2205 to a structure or union, extract and return its component (field) of
2206 type FTYPE at the specified BITPOS.
2207 Throw an exception on error. */
2210 value_struct_elt_bitpos (struct value
**argp
, int bitpos
, struct type
*ftype
,
2216 *argp
= coerce_array (*argp
);
2218 t
= check_typedef (value_type (*argp
));
2220 while (TYPE_CODE (t
) == TYPE_CODE_PTR
|| TYPE_IS_REFERENCE (t
))
2222 *argp
= value_ind (*argp
);
2223 if (TYPE_CODE (check_typedef (value_type (*argp
))) != TYPE_CODE_FUNC
)
2224 *argp
= coerce_array (*argp
);
2225 t
= check_typedef (value_type (*argp
));
2228 if (TYPE_CODE (t
) != TYPE_CODE_STRUCT
2229 && TYPE_CODE (t
) != TYPE_CODE_UNION
)
2230 error (_("Attempt to extract a component of a value that is not a %s."),
2233 for (i
= TYPE_N_BASECLASSES (t
); i
< TYPE_NFIELDS (t
); i
++)
2235 if (!field_is_static (&TYPE_FIELD (t
, i
))
2236 && bitpos
== TYPE_FIELD_BITPOS (t
, i
)
2237 && types_equal (ftype
, TYPE_FIELD_TYPE (t
, i
)))
2238 return value_primitive_field (*argp
, 0, i
, t
);
2241 error (_("No field with matching bitpos and type."));
2250 value_union_variant (struct type
*union_type
, const gdb_byte
*contents
)
2252 gdb_assert (TYPE_CODE (union_type
) == TYPE_CODE_UNION
2253 && TYPE_FLAG_DISCRIMINATED_UNION (union_type
));
2255 struct dynamic_prop
*discriminant_prop
2256 = get_dyn_prop (DYN_PROP_DISCRIMINATED
, union_type
);
2257 gdb_assert (discriminant_prop
!= nullptr);
2259 struct discriminant_info
*info
2260 = (struct discriminant_info
*) discriminant_prop
->data
.baton
;
2261 gdb_assert (info
!= nullptr);
2263 /* If this is a univariant union, just return the sole field. */
2264 if (TYPE_NFIELDS (union_type
) == 1)
2266 /* This should only happen for univariants, which we already dealt
2268 gdb_assert (info
->discriminant_index
!= -1);
2270 /* Compute the discriminant. Note that unpack_field_as_long handles
2271 sign extension when necessary, as does the DWARF reader -- so
2272 signed discriminants will be handled correctly despite the use of
2273 an unsigned type here. */
2274 ULONGEST discriminant
= unpack_field_as_long (union_type
, contents
,
2275 info
->discriminant_index
);
2277 for (int i
= 0; i
< TYPE_NFIELDS (union_type
); ++i
)
2279 if (i
!= info
->default_index
2280 && i
!= info
->discriminant_index
2281 && discriminant
== info
->discriminants
[i
])
2285 if (info
->default_index
== -1)
2286 error (_("Could not find variant corresponding to discriminant %s"),
2287 pulongest (discriminant
));
2288 return info
->default_index
;
2291 /* Search through the methods of an object (and its bases) to find a
2292 specified method. Return a reference to the fn_field list METHODS of
2293 overloaded instances defined in the source language. If available
2294 and matching, a vector of matching xmethods defined in extension
2295 languages are also returned in XMETHODS.
2297 Helper function for value_find_oload_list.
2298 ARGP is a pointer to a pointer to a value (the object).
2299 METHOD is a string containing the method name.
2300 OFFSET is the offset within the value.
2301 TYPE is the assumed type of the object.
2302 METHODS is a pointer to the matching overloaded instances defined
2303 in the source language. Since this is a recursive function,
2304 *METHODS should be set to NULL when calling this function.
2305 NUM_FNS is the number of overloaded instances. *NUM_FNS should be set to
2306 0 when calling this function.
2307 XMETHODS is the vector of matching xmethod workers. *XMETHODS
2308 should also be set to NULL when calling this function.
2309 BASETYPE is set to the actual type of the subobject where the
2311 BOFFSET is the offset of the base subobject where the method is found. */
2314 find_method_list (struct value
**argp
, const char *method
,
2315 LONGEST offset
, struct type
*type
,
2316 gdb::array_view
<fn_field
> *methods
,
2317 std::vector
<xmethod_worker_up
> *xmethods
,
2318 struct type
**basetype
, LONGEST
*boffset
)
2321 struct fn_field
*f
= NULL
;
2323 gdb_assert (methods
!= NULL
&& xmethods
!= NULL
);
2324 type
= check_typedef (type
);
2326 /* First check in object itself.
2327 This function is called recursively to search through base classes.
2328 If there is a source method match found at some stage, then we need not
2329 look for source methods in consequent recursive calls. */
2330 if (methods
->empty ())
2332 for (i
= TYPE_NFN_FIELDS (type
) - 1; i
>= 0; i
--)
2334 /* pai: FIXME What about operators and type conversions? */
2335 const char *fn_field_name
= TYPE_FN_FIELDLIST_NAME (type
, i
);
2337 if (fn_field_name
&& (strcmp_iw (fn_field_name
, method
) == 0))
2339 int len
= TYPE_FN_FIELDLIST_LENGTH (type
, i
);
2340 f
= TYPE_FN_FIELDLIST1 (type
, i
);
2341 *methods
= gdb::make_array_view (f
, len
);
2346 /* Resolve any stub methods. */
2347 check_stub_method_group (type
, i
);
2354 /* Unlike source methods, xmethods can be accumulated over successive
2355 recursive calls. In other words, an xmethod named 'm' in a class
2356 will not hide an xmethod named 'm' in its base class(es). We want
2357 it to be this way because xmethods are after all convenience functions
2358 and hence there is no point restricting them with something like method
2359 hiding. Moreover, if hiding is done for xmethods as well, then we will
2360 have to provide a mechanism to un-hide (like the 'using' construct). */
2361 get_matching_xmethod_workers (type
, method
, xmethods
);
2363 /* If source methods are not found in current class, look for them in the
2364 base classes. We also have to go through the base classes to gather
2365 extension methods. */
2366 for (i
= TYPE_N_BASECLASSES (type
) - 1; i
>= 0; i
--)
2368 LONGEST base_offset
;
2370 if (BASETYPE_VIA_VIRTUAL (type
, i
))
2372 base_offset
= baseclass_offset (type
, i
,
2373 value_contents_for_printing (*argp
),
2374 value_offset (*argp
) + offset
,
2375 value_address (*argp
), *argp
);
2377 else /* Non-virtual base, simply use bit position from debug
2380 base_offset
= TYPE_BASECLASS_BITPOS (type
, i
) / 8;
2383 find_method_list (argp
, method
, base_offset
+ offset
,
2384 TYPE_BASECLASS (type
, i
), methods
,
2385 xmethods
, basetype
, boffset
);
2389 /* Return the list of overloaded methods of a specified name. The methods
2390 could be those GDB finds in the binary, or xmethod. Methods found in
2391 the binary are returned in METHODS, and xmethods are returned in
2394 ARGP is a pointer to a pointer to a value (the object).
2395 METHOD is the method name.
2396 OFFSET is the offset within the value contents.
2397 METHODS is the list of matching overloaded instances defined in
2398 the source language.
2399 XMETHODS is the vector of matching xmethod workers defined in
2400 extension languages.
2401 BASETYPE is set to the type of the base subobject that defines the
2403 BOFFSET is the offset of the base subobject which defines the method. */
2406 value_find_oload_method_list (struct value
**argp
, const char *method
,
2408 gdb::array_view
<fn_field
> *methods
,
2409 std::vector
<xmethod_worker_up
> *xmethods
,
2410 struct type
**basetype
, LONGEST
*boffset
)
2414 t
= check_typedef (value_type (*argp
));
2416 /* Code snarfed from value_struct_elt. */
2417 while (TYPE_CODE (t
) == TYPE_CODE_PTR
|| TYPE_IS_REFERENCE (t
))
2419 *argp
= value_ind (*argp
);
2420 /* Don't coerce fn pointer to fn and then back again! */
2421 if (TYPE_CODE (check_typedef (value_type (*argp
))) != TYPE_CODE_FUNC
)
2422 *argp
= coerce_array (*argp
);
2423 t
= check_typedef (value_type (*argp
));
2426 if (TYPE_CODE (t
) != TYPE_CODE_STRUCT
2427 && TYPE_CODE (t
) != TYPE_CODE_UNION
)
2428 error (_("Attempt to extract a component of a "
2429 "value that is not a struct or union"));
2431 gdb_assert (methods
!= NULL
&& xmethods
!= NULL
);
2433 /* Clear the lists. */
2437 find_method_list (argp
, method
, 0, t
, methods
, xmethods
,
2441 /* Given an array of arguments (ARGS) (which includes an entry for
2442 "this" in the case of C++ methods), the NAME of a function, and
2443 whether it's a method or not (METHOD), find the best function that
2444 matches on the argument types according to the overload resolution
2447 METHOD can be one of three values:
2448 NON_METHOD for non-member functions.
2449 METHOD: for member functions.
2450 BOTH: used for overload resolution of operators where the
2451 candidates are expected to be either member or non member
2452 functions. In this case the first argument ARGTYPES
2453 (representing 'this') is expected to be a reference to the
2454 target object, and will be dereferenced when attempting the
2457 In the case of class methods, the parameter OBJ is an object value
2458 in which to search for overloaded methods.
2460 In the case of non-method functions, the parameter FSYM is a symbol
2461 corresponding to one of the overloaded functions.
2463 Return value is an integer: 0 -> good match, 10 -> debugger applied
2464 non-standard coercions, 100 -> incompatible.
2466 If a method is being searched for, VALP will hold the value.
2467 If a non-method is being searched for, SYMP will hold the symbol
2470 If a method is being searched for, and it is a static method,
2471 then STATICP will point to a non-zero value.
2473 If NO_ADL argument dependent lookup is disabled. This is used to prevent
2474 ADL overload candidates when performing overload resolution for a fully
2477 If NOSIDE is EVAL_AVOID_SIDE_EFFECTS, then OBJP's memory cannot be
2478 read while picking the best overload match (it may be all zeroes and thus
2479 not have a vtable pointer), in which case skip virtual function lookup.
2480 This is ok as typically EVAL_AVOID_SIDE_EFFECTS is only used to determine
2483 Note: This function does *not* check the value of
2484 overload_resolution. Caller must check it to see whether overload
2485 resolution is permitted. */
2488 find_overload_match (gdb::array_view
<value
*> args
,
2489 const char *name
, enum oload_search_type method
,
2490 struct value
**objp
, struct symbol
*fsym
,
2491 struct value
**valp
, struct symbol
**symp
,
2492 int *staticp
, const int no_adl
,
2493 const enum noside noside
)
2495 struct value
*obj
= (objp
? *objp
: NULL
);
2496 struct type
*obj_type
= obj
? value_type (obj
) : NULL
;
2497 /* Index of best overloaded function. */
2498 int func_oload_champ
= -1;
2499 int method_oload_champ
= -1;
2500 int src_method_oload_champ
= -1;
2501 int ext_method_oload_champ
= -1;
2503 /* The measure for the current best match. */
2504 badness_vector method_badness
;
2505 badness_vector func_badness
;
2506 badness_vector ext_method_badness
;
2507 badness_vector src_method_badness
;
2509 struct value
*temp
= obj
;
2510 /* For methods, the list of overloaded methods. */
2511 gdb::array_view
<fn_field
> methods
;
2512 /* For non-methods, the list of overloaded function symbols. */
2513 std::vector
<symbol
*> functions
;
2514 /* For xmethods, the vector of xmethod workers. */
2515 std::vector
<xmethod_worker_up
> xmethods
;
2516 struct type
*basetype
= NULL
;
2519 struct cleanup
*all_cleanups
= make_cleanup (null_cleanup
, NULL
);
2521 const char *obj_type_name
= NULL
;
2522 const char *func_name
= NULL
;
2523 gdb::unique_xmalloc_ptr
<char> temp_func
;
2524 enum oload_classification match_quality
;
2525 enum oload_classification method_match_quality
= INCOMPATIBLE
;
2526 enum oload_classification src_method_match_quality
= INCOMPATIBLE
;
2527 enum oload_classification ext_method_match_quality
= INCOMPATIBLE
;
2528 enum oload_classification func_match_quality
= INCOMPATIBLE
;
2530 /* Get the list of overloaded methods or functions. */
2531 if (method
== METHOD
|| method
== BOTH
)
2535 /* OBJ may be a pointer value rather than the object itself. */
2536 obj
= coerce_ref (obj
);
2537 while (TYPE_CODE (check_typedef (value_type (obj
))) == TYPE_CODE_PTR
)
2538 obj
= coerce_ref (value_ind (obj
));
2539 obj_type_name
= TYPE_NAME (value_type (obj
));
2541 /* First check whether this is a data member, e.g. a pointer to
2543 if (TYPE_CODE (check_typedef (value_type (obj
))) == TYPE_CODE_STRUCT
)
2545 *valp
= search_struct_field (name
, obj
,
2546 check_typedef (value_type (obj
)), 0);
2550 do_cleanups (all_cleanups
);
2555 /* Retrieve the list of methods with the name NAME. */
2556 value_find_oload_method_list (&temp
, name
, 0, &methods
,
2557 &xmethods
, &basetype
, &boffset
);
2558 /* If this is a method only search, and no methods were found
2559 the search has failed. */
2560 if (method
== METHOD
&& methods
.empty () && xmethods
.empty ())
2561 error (_("Couldn't find method %s%s%s"),
2563 (obj_type_name
&& *obj_type_name
) ? "::" : "",
2565 /* If we are dealing with stub method types, they should have
2566 been resolved by find_method_list via
2567 value_find_oload_method_list above. */
2568 if (!methods
.empty ())
2570 gdb_assert (TYPE_SELF_TYPE (methods
[0].type
) != NULL
);
2572 src_method_oload_champ
2573 = find_oload_champ (args
,
2575 methods
.data (), NULL
, NULL
,
2576 &src_method_badness
);
2578 src_method_match_quality
= classify_oload_match
2579 (src_method_badness
, args
.size (),
2580 oload_method_static_p (methods
.data (), src_method_oload_champ
));
2583 if (!xmethods
.empty ())
2585 ext_method_oload_champ
2586 = find_oload_champ (args
,
2588 NULL
, xmethods
.data (), NULL
,
2589 &ext_method_badness
);
2590 ext_method_match_quality
= classify_oload_match (ext_method_badness
,
2594 if (src_method_oload_champ
>= 0 && ext_method_oload_champ
>= 0)
2596 switch (compare_badness (ext_method_badness
, src_method_badness
))
2598 case 0: /* Src method and xmethod are equally good. */
2599 /* If src method and xmethod are equally good, then
2600 xmethod should be the winner. Hence, fall through to the
2601 case where a xmethod is better than the source
2602 method, except when the xmethod match quality is
2605 case 1: /* Src method and ext method are incompatible. */
2606 /* If ext method match is not standard, then let source method
2607 win. Otherwise, fallthrough to let xmethod win. */
2608 if (ext_method_match_quality
!= STANDARD
)
2610 method_oload_champ
= src_method_oload_champ
;
2611 method_badness
= src_method_badness
;
2612 ext_method_oload_champ
= -1;
2613 method_match_quality
= src_method_match_quality
;
2617 case 2: /* Ext method is champion. */
2618 method_oload_champ
= ext_method_oload_champ
;
2619 method_badness
= ext_method_badness
;
2620 src_method_oload_champ
= -1;
2621 method_match_quality
= ext_method_match_quality
;
2623 case 3: /* Src method is champion. */
2624 method_oload_champ
= src_method_oload_champ
;
2625 method_badness
= src_method_badness
;
2626 ext_method_oload_champ
= -1;
2627 method_match_quality
= src_method_match_quality
;
2630 gdb_assert_not_reached ("Unexpected overload comparison "
2635 else if (src_method_oload_champ
>= 0)
2637 method_oload_champ
= src_method_oload_champ
;
2638 method_badness
= src_method_badness
;
2639 method_match_quality
= src_method_match_quality
;
2641 else if (ext_method_oload_champ
>= 0)
2643 method_oload_champ
= ext_method_oload_champ
;
2644 method_badness
= ext_method_badness
;
2645 method_match_quality
= ext_method_match_quality
;
2649 if (method
== NON_METHOD
|| method
== BOTH
)
2651 const char *qualified_name
= NULL
;
2653 /* If the overload match is being search for both as a method
2654 and non member function, the first argument must now be
2657 args
[0] = value_ind (args
[0]);
2661 qualified_name
= SYMBOL_NATURAL_NAME (fsym
);
2663 /* If we have a function with a C++ name, try to extract just
2664 the function part. Do not try this for non-functions (e.g.
2665 function pointers). */
2667 && TYPE_CODE (check_typedef (SYMBOL_TYPE (fsym
)))
2670 temp_func
= cp_func_name (qualified_name
);
2672 /* If cp_func_name did not remove anything, the name of the
2673 symbol did not include scope or argument types - it was
2674 probably a C-style function. */
2675 if (temp_func
!= nullptr)
2677 if (strcmp (temp_func
.get (), qualified_name
) == 0)
2680 func_name
= temp_func
.get ();
2687 qualified_name
= name
;
2690 /* If there was no C++ name, this must be a C-style function or
2691 not a function at all. Just return the same symbol. Do the
2692 same if cp_func_name fails for some reason. */
2693 if (func_name
== NULL
)
2696 do_cleanups (all_cleanups
);
2700 func_oload_champ
= find_oload_champ_namespace (args
,
2707 if (func_oload_champ
>= 0)
2708 func_match_quality
= classify_oload_match (func_badness
,
2712 /* Did we find a match ? */
2713 if (method_oload_champ
== -1 && func_oload_champ
== -1)
2714 throw_error (NOT_FOUND_ERROR
,
2715 _("No symbol \"%s\" in current context."),
2718 /* If we have found both a method match and a function
2719 match, find out which one is better, and calculate match
2721 if (method_oload_champ
>= 0 && func_oload_champ
>= 0)
2723 switch (compare_badness (func_badness
, method_badness
))
2725 case 0: /* Top two contenders are equally good. */
2726 /* FIXME: GDB does not support the general ambiguous case.
2727 All candidates should be collected and presented the
2729 error (_("Ambiguous overload resolution"));
2731 case 1: /* Incomparable top contenders. */
2732 /* This is an error incompatible candidates
2733 should not have been proposed. */
2734 error (_("Internal error: incompatible "
2735 "overload candidates proposed"));
2737 case 2: /* Function champion. */
2738 method_oload_champ
= -1;
2739 match_quality
= func_match_quality
;
2741 case 3: /* Method champion. */
2742 func_oload_champ
= -1;
2743 match_quality
= method_match_quality
;
2746 error (_("Internal error: unexpected overload comparison result"));
2752 /* We have either a method match or a function match. */
2753 if (method_oload_champ
>= 0)
2754 match_quality
= method_match_quality
;
2756 match_quality
= func_match_quality
;
2759 if (match_quality
== INCOMPATIBLE
)
2761 if (method
== METHOD
)
2762 error (_("Cannot resolve method %s%s%s to any overloaded instance"),
2764 (obj_type_name
&& *obj_type_name
) ? "::" : "",
2767 error (_("Cannot resolve function %s to any overloaded instance"),
2770 else if (match_quality
== NON_STANDARD
)
2772 if (method
== METHOD
)
2773 warning (_("Using non-standard conversion to match "
2774 "method %s%s%s to supplied arguments"),
2776 (obj_type_name
&& *obj_type_name
) ? "::" : "",
2779 warning (_("Using non-standard conversion to match "
2780 "function %s to supplied arguments"),
2784 if (staticp
!= NULL
)
2785 *staticp
= oload_method_static_p (methods
.data (), method_oload_champ
);
2787 if (method_oload_champ
>= 0)
2789 if (src_method_oload_champ
>= 0)
2791 if (TYPE_FN_FIELD_VIRTUAL_P (methods
, method_oload_champ
)
2792 && noside
!= EVAL_AVOID_SIDE_EFFECTS
)
2794 *valp
= value_virtual_fn_field (&temp
, methods
.data (),
2795 method_oload_champ
, basetype
,
2799 *valp
= value_fn_field (&temp
, methods
.data (),
2800 method_oload_champ
, basetype
, boffset
);
2803 *valp
= value_from_xmethod
2804 (std::move (xmethods
[ext_method_oload_champ
]));
2807 *symp
= functions
[func_oload_champ
];
2811 struct type
*temp_type
= check_typedef (value_type (temp
));
2812 struct type
*objtype
= check_typedef (obj_type
);
2814 if (TYPE_CODE (temp_type
) != TYPE_CODE_PTR
2815 && (TYPE_CODE (objtype
) == TYPE_CODE_PTR
2816 || TYPE_IS_REFERENCE (objtype
)))
2818 temp
= value_addr (temp
);
2823 do_cleanups (all_cleanups
);
2825 switch (match_quality
)
2831 default: /* STANDARD */
2836 /* Find the best overload match, searching for FUNC_NAME in namespaces
2837 contained in QUALIFIED_NAME until it either finds a good match or
2838 runs out of namespaces. It stores the overloaded functions in
2839 *OLOAD_SYMS, and the badness vector in *OLOAD_CHAMP_BV. If NO_ADL,
2840 argument dependent lookup is not performned. */
2843 find_oload_champ_namespace (gdb::array_view
<value
*> args
,
2844 const char *func_name
,
2845 const char *qualified_name
,
2846 std::vector
<symbol
*> *oload_syms
,
2847 badness_vector
*oload_champ_bv
,
2852 find_oload_champ_namespace_loop (args
,
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. */
2869 find_oload_champ_namespace_loop (gdb::array_view
<value
*> args
,
2870 const char *func_name
,
2871 const char *qualified_name
,
2873 std::vector
<symbol
*> *oload_syms
,
2874 badness_vector
*oload_champ_bv
,
2878 int next_namespace_len
= namespace_len
;
2879 int searched_deeper
= 0;
2880 int new_oload_champ
;
2881 char *new_namespace
;
2883 if (next_namespace_len
!= 0)
2885 gdb_assert (qualified_name
[next_namespace_len
] == ':');
2886 next_namespace_len
+= 2;
2888 next_namespace_len
+=
2889 cp_find_first_component (qualified_name
+ next_namespace_len
);
2891 /* First, see if we have a deeper namespace we can search in.
2892 If we get a good match there, use it. */
2894 if (qualified_name
[next_namespace_len
] == ':')
2896 searched_deeper
= 1;
2898 if (find_oload_champ_namespace_loop (args
,
2899 func_name
, qualified_name
,
2901 oload_syms
, oload_champ_bv
,
2902 oload_champ
, no_adl
))
2908 /* If we reach here, either we're in the deepest namespace or we
2909 didn't find a good match in a deeper namespace. But, in the
2910 latter case, we still have a bad match in a deeper namespace;
2911 note that we might not find any match at all in the current
2912 namespace. (There's always a match in the deepest namespace,
2913 because this overload mechanism only gets called if there's a
2914 function symbol to start off with.) */
2916 new_namespace
= (char *) alloca (namespace_len
+ 1);
2917 strncpy (new_namespace
, qualified_name
, namespace_len
);
2918 new_namespace
[namespace_len
] = '\0';
2920 std::vector
<symbol
*> new_oload_syms
2921 = make_symbol_overload_list (func_name
, new_namespace
);
2923 /* If we have reached the deepest level perform argument
2924 determined lookup. */
2925 if (!searched_deeper
&& !no_adl
)
2928 struct type
**arg_types
;
2930 /* Prepare list of argument types for overload resolution. */
2931 arg_types
= (struct type
**)
2932 alloca (args
.size () * (sizeof (struct type
*)));
2933 for (ix
= 0; ix
< args
.size (); ix
++)
2934 arg_types
[ix
] = value_type (args
[ix
]);
2935 add_symbol_overload_list_adl ({arg_types
, args
.size ()}, func_name
,
2939 badness_vector new_oload_champ_bv
;
2940 new_oload_champ
= find_oload_champ (args
,
2941 new_oload_syms
.size (),
2942 NULL
, NULL
, new_oload_syms
.data (),
2943 &new_oload_champ_bv
);
2945 /* Case 1: We found a good match. Free earlier matches (if any),
2946 and return it. Case 2: We didn't find a good match, but we're
2947 not the deepest function. Then go with the bad match that the
2948 deeper function found. Case 3: We found a bad match, and we're
2949 the deepest function. Then return what we found, even though
2950 it's a bad match. */
2952 if (new_oload_champ
!= -1
2953 && classify_oload_match (new_oload_champ_bv
, args
.size (), 0) == STANDARD
)
2955 *oload_syms
= std::move (new_oload_syms
);
2956 *oload_champ
= new_oload_champ
;
2957 *oload_champ_bv
= std::move (new_oload_champ_bv
);
2960 else if (searched_deeper
)
2966 *oload_syms
= std::move (new_oload_syms
);
2967 *oload_champ
= new_oload_champ
;
2968 *oload_champ_bv
= std::move (new_oload_champ_bv
);
2973 /* Look for a function to take ARGS. Find the best match from among
2974 the overloaded methods or functions given by METHODS or FUNCTIONS
2975 or XMETHODS, respectively. One, and only one of METHODS, FUNCTIONS
2976 and XMETHODS can be non-NULL.
2978 NUM_FNS is the length of the array pointed at by METHODS, FUNCTIONS
2979 or XMETHODS, whichever is non-NULL.
2981 Return the index of the best match; store an indication of the
2982 quality of the match in OLOAD_CHAMP_BV. */
2985 find_oload_champ (gdb::array_view
<value
*> args
,
2988 xmethod_worker_up
*xmethods
,
2990 badness_vector
*oload_champ_bv
)
2992 /* A measure of how good an overloaded instance is. */
2994 /* Index of best overloaded function. */
2995 int oload_champ
= -1;
2996 /* Current ambiguity state for overload resolution. */
2997 int oload_ambiguous
= 0;
2998 /* 0 => no ambiguity, 1 => two good funcs, 2 => incomparable funcs. */
3000 /* A champion can be found among methods alone, or among functions
3001 alone, or in xmethods alone, but not in more than one of these
3003 gdb_assert ((methods
!= NULL
) + (functions
!= NULL
) + (xmethods
!= NULL
)
3006 /* Consider each candidate in turn. */
3007 for (size_t ix
= 0; ix
< num_fns
; ix
++)
3010 int static_offset
= 0;
3011 std::vector
<type
*> parm_types
;
3013 if (xmethods
!= NULL
)
3014 parm_types
= xmethods
[ix
]->get_arg_types ();
3019 if (methods
!= NULL
)
3021 nparms
= TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (methods
, ix
));
3022 static_offset
= oload_method_static_p (methods
, ix
);
3025 nparms
= TYPE_NFIELDS (SYMBOL_TYPE (functions
[ix
]));
3027 parm_types
.reserve (nparms
);
3028 for (jj
= 0; jj
< nparms
; jj
++)
3030 type
*t
= (methods
!= NULL
3031 ? (TYPE_FN_FIELD_ARGS (methods
, ix
)[jj
].type
)
3032 : TYPE_FIELD_TYPE (SYMBOL_TYPE (functions
[ix
]),
3034 parm_types
.push_back (t
);
3038 /* Compare parameter types to supplied argument types. Skip
3039 THIS for static methods. */
3040 bv
= rank_function (parm_types
,
3041 args
.slice (static_offset
));
3043 if (oload_champ_bv
->empty ())
3045 *oload_champ_bv
= std::move (bv
);
3048 else /* See whether current candidate is better or worse than
3050 switch (compare_badness (bv
, *oload_champ_bv
))
3052 case 0: /* Top two contenders are equally good. */
3053 oload_ambiguous
= 1;
3055 case 1: /* Incomparable top contenders. */
3056 oload_ambiguous
= 2;
3058 case 2: /* New champion, record details. */
3059 *oload_champ_bv
= std::move (bv
);
3060 oload_ambiguous
= 0;
3069 if (methods
!= NULL
)
3070 fprintf_filtered (gdb_stderr
,
3071 "Overloaded method instance %s, # of parms %d\n",
3072 methods
[ix
].physname
, (int) parm_types
.size ());
3073 else if (xmethods
!= NULL
)
3074 fprintf_filtered (gdb_stderr
,
3075 "Xmethod worker, # of parms %d\n",
3076 (int) parm_types
.size ());
3078 fprintf_filtered (gdb_stderr
,
3079 "Overloaded function instance "
3080 "%s # of parms %d\n",
3081 SYMBOL_DEMANGLED_NAME (functions
[ix
]),
3082 (int) parm_types
.size ());
3083 for (jj
= 0; jj
< args
.size () - static_offset
; jj
++)
3084 fprintf_filtered (gdb_stderr
,
3085 "...Badness @ %d : %d\n",
3087 fprintf_filtered (gdb_stderr
, "Overload resolution "
3088 "champion is %d, ambiguous? %d\n",
3089 oload_champ
, oload_ambiguous
);
3096 /* Return 1 if we're looking at a static method, 0 if we're looking at
3097 a non-static method or a function that isn't a method. */
3100 oload_method_static_p (struct fn_field
*fns_ptr
, int index
)
3102 if (fns_ptr
&& index
>= 0 && TYPE_FN_FIELD_STATIC_P (fns_ptr
, index
))
3108 /* Check how good an overload match OLOAD_CHAMP_BV represents. */
3110 static enum oload_classification
3111 classify_oload_match (const badness_vector
&oload_champ_bv
,
3116 enum oload_classification worst
= STANDARD
;
3118 for (ix
= 1; ix
<= nargs
- static_offset
; ix
++)
3120 /* If this conversion is as bad as INCOMPATIBLE_TYPE_BADNESS
3121 or worse return INCOMPATIBLE. */
3122 if (compare_ranks (oload_champ_bv
[ix
],
3123 INCOMPATIBLE_TYPE_BADNESS
) <= 0)
3124 return INCOMPATIBLE
; /* Truly mismatched types. */
3125 /* Otherwise If this conversion is as bad as
3126 NS_POINTER_CONVERSION_BADNESS or worse return NON_STANDARD. */
3127 else if (compare_ranks (oload_champ_bv
[ix
],
3128 NS_POINTER_CONVERSION_BADNESS
) <= 0)
3129 worst
= NON_STANDARD
; /* Non-standard type conversions
3133 /* If no INCOMPATIBLE classification was found, return the worst one
3134 that was found (if any). */
3138 /* C++: return 1 is NAME is a legitimate name for the destructor of
3139 type TYPE. If TYPE does not have a destructor, or if NAME is
3140 inappropriate for TYPE, an error is signaled. Parameter TYPE should not yet
3141 have CHECK_TYPEDEF applied, this function will apply it itself. */
3144 destructor_name_p (const char *name
, struct type
*type
)
3148 const char *dname
= type_name_or_error (type
);
3149 const char *cp
= strchr (dname
, '<');
3152 /* Do not compare the template part for template classes. */
3154 len
= strlen (dname
);
3157 if (strlen (name
+ 1) != len
|| strncmp (dname
, name
+ 1, len
) != 0)
3158 error (_("name of destructor must equal name of class"));
3165 /* Find an enum constant named NAME in TYPE. TYPE must be an "enum
3166 class". If the name is found, return a value representing it;
3167 otherwise throw an exception. */
3169 static struct value
*
3170 enum_constant_from_type (struct type
*type
, const char *name
)
3173 int name_len
= strlen (name
);
3175 gdb_assert (TYPE_CODE (type
) == TYPE_CODE_ENUM
3176 && TYPE_DECLARED_CLASS (type
));
3178 for (i
= TYPE_N_BASECLASSES (type
); i
< TYPE_NFIELDS (type
); ++i
)
3180 const char *fname
= TYPE_FIELD_NAME (type
, i
);
3183 if (TYPE_FIELD_LOC_KIND (type
, i
) != FIELD_LOC_KIND_ENUMVAL
3187 /* Look for the trailing "::NAME", since enum class constant
3188 names are qualified here. */
3189 len
= strlen (fname
);
3190 if (len
+ 2 >= name_len
3191 && fname
[len
- name_len
- 2] == ':'
3192 && fname
[len
- name_len
- 1] == ':'
3193 && strcmp (&fname
[len
- name_len
], name
) == 0)
3194 return value_from_longest (type
, TYPE_FIELD_ENUMVAL (type
, i
));
3197 error (_("no constant named \"%s\" in enum \"%s\""),
3198 name
, TYPE_NAME (type
));
3201 /* C++: Given an aggregate type CURTYPE, and a member name NAME,
3202 return the appropriate member (or the address of the member, if
3203 WANT_ADDRESS). This function is used to resolve user expressions
3204 of the form "DOMAIN::NAME". For more details on what happens, see
3205 the comment before value_struct_elt_for_reference. */
3208 value_aggregate_elt (struct type
*curtype
, const char *name
,
3209 struct type
*expect_type
, int want_address
,
3212 switch (TYPE_CODE (curtype
))
3214 case TYPE_CODE_STRUCT
:
3215 case TYPE_CODE_UNION
:
3216 return value_struct_elt_for_reference (curtype
, 0, curtype
,
3218 want_address
, noside
);
3219 case TYPE_CODE_NAMESPACE
:
3220 return value_namespace_elt (curtype
, name
,
3221 want_address
, noside
);
3223 case TYPE_CODE_ENUM
:
3224 return enum_constant_from_type (curtype
, name
);
3227 internal_error (__FILE__
, __LINE__
,
3228 _("non-aggregate type in value_aggregate_elt"));
3232 /* Compares the two method/function types T1 and T2 for "equality"
3233 with respect to the methods' parameters. If the types of the
3234 two parameter lists are the same, returns 1; 0 otherwise. This
3235 comparison may ignore any artificial parameters in T1 if
3236 SKIP_ARTIFICIAL is non-zero. This function will ALWAYS skip
3237 the first artificial parameter in T1, assumed to be a 'this' pointer.
3239 The type T2 is expected to have come from make_params (in eval.c). */
3242 compare_parameters (struct type
*t1
, struct type
*t2
, int skip_artificial
)
3246 if (TYPE_NFIELDS (t1
) > 0 && TYPE_FIELD_ARTIFICIAL (t1
, 0))
3249 /* If skipping artificial fields, find the first real field
3251 if (skip_artificial
)
3253 while (start
< TYPE_NFIELDS (t1
)
3254 && TYPE_FIELD_ARTIFICIAL (t1
, start
))
3258 /* Now compare parameters. */
3260 /* Special case: a method taking void. T1 will contain no
3261 non-artificial fields, and T2 will contain TYPE_CODE_VOID. */
3262 if ((TYPE_NFIELDS (t1
) - start
) == 0 && TYPE_NFIELDS (t2
) == 1
3263 && TYPE_CODE (TYPE_FIELD_TYPE (t2
, 0)) == TYPE_CODE_VOID
)
3266 if ((TYPE_NFIELDS (t1
) - start
) == TYPE_NFIELDS (t2
))
3270 for (i
= 0; i
< TYPE_NFIELDS (t2
); ++i
)
3272 if (compare_ranks (rank_one_type (TYPE_FIELD_TYPE (t1
, start
+ i
),
3273 TYPE_FIELD_TYPE (t2
, i
), NULL
),
3274 EXACT_MATCH_BADNESS
) != 0)
3284 /* C++: Given an aggregate type VT, and a class type CLS, search
3285 recursively for CLS using value V; If found, store the offset
3286 which is either fetched from the virtual base pointer if CLS
3287 is virtual or accumulated offset of its parent classes if
3288 CLS is non-virtual in *BOFFS, set ISVIRT to indicate if CLS
3289 is virtual, and return true. If not found, return false. */
3292 get_baseclass_offset (struct type
*vt
, struct type
*cls
,
3293 struct value
*v
, int *boffs
, bool *isvirt
)
3295 for (int i
= 0; i
< TYPE_N_BASECLASSES (vt
); i
++)
3297 struct type
*t
= TYPE_FIELD_TYPE (vt
, i
);
3298 if (types_equal (t
, cls
))
3300 if (BASETYPE_VIA_VIRTUAL (vt
, i
))
3302 const gdb_byte
*adr
= value_contents_for_printing (v
);
3303 *boffs
= baseclass_offset (vt
, i
, adr
, value_offset (v
),
3304 value_as_long (v
), v
);
3312 if (get_baseclass_offset (check_typedef (t
), cls
, v
, boffs
, isvirt
))
3314 if (*isvirt
== false) /* Add non-virtual base offset. */
3316 const gdb_byte
*adr
= value_contents_for_printing (v
);
3317 *boffs
+= baseclass_offset (vt
, i
, adr
, value_offset (v
),
3318 value_as_long (v
), v
);
3327 /* C++: Given an aggregate type CURTYPE, and a member name NAME,
3328 return the address of this member as a "pointer to member" type.
3329 If INTYPE is non-null, then it will be the type of the member we
3330 are looking for. This will help us resolve "pointers to member
3331 functions". This function is used to resolve user expressions of
3332 the form "DOMAIN::NAME". */
3334 static struct value
*
3335 value_struct_elt_for_reference (struct type
*domain
, int offset
,
3336 struct type
*curtype
, const char *name
,
3337 struct type
*intype
,
3341 struct type
*t
= check_typedef (curtype
);
3343 struct value
*result
;
3345 if (TYPE_CODE (t
) != TYPE_CODE_STRUCT
3346 && TYPE_CODE (t
) != TYPE_CODE_UNION
)
3347 error (_("Internal error: non-aggregate type "
3348 "to value_struct_elt_for_reference"));
3350 for (i
= TYPE_NFIELDS (t
) - 1; i
>= TYPE_N_BASECLASSES (t
); i
--)
3352 const char *t_field_name
= TYPE_FIELD_NAME (t
, i
);
3354 if (t_field_name
&& strcmp (t_field_name
, name
) == 0)
3356 if (field_is_static (&TYPE_FIELD (t
, i
)))
3358 struct value
*v
= value_static_field (t
, i
);
3363 if (TYPE_FIELD_PACKED (t
, i
))
3364 error (_("pointers to bitfield members not allowed"));
3367 return value_from_longest
3368 (lookup_memberptr_type (TYPE_FIELD_TYPE (t
, i
), domain
),
3369 offset
+ (LONGEST
) (TYPE_FIELD_BITPOS (t
, i
) >> 3));
3370 else if (noside
!= EVAL_NORMAL
)
3371 return allocate_value (TYPE_FIELD_TYPE (t
, i
));
3374 /* Try to evaluate NAME as a qualified name with implicit
3375 this pointer. In this case, attempt to return the
3376 equivalent to `this->*(&TYPE::NAME)'. */
3377 struct value
*v
= value_of_this_silent (current_language
);
3380 struct value
*ptr
, *this_v
= v
;
3382 struct type
*type
, *tmp
;
3384 ptr
= value_aggregate_elt (domain
, name
, NULL
, 1, noside
);
3385 type
= check_typedef (value_type (ptr
));
3386 gdb_assert (type
!= NULL
3387 && TYPE_CODE (type
) == TYPE_CODE_MEMBERPTR
);
3388 tmp
= lookup_pointer_type (TYPE_SELF_TYPE (type
));
3389 v
= value_cast_pointers (tmp
, v
, 1);
3390 mem_offset
= value_as_long (ptr
);
3391 if (domain
!= curtype
)
3393 /* Find class offset of type CURTYPE from either its
3394 parent type DOMAIN or the type of implied this. */
3396 bool isvirt
= false;
3397 if (get_baseclass_offset (domain
, curtype
, v
, &boff
,
3402 struct type
*p
= check_typedef (value_type (this_v
));
3403 p
= check_typedef (TYPE_TARGET_TYPE (p
));
3404 if (get_baseclass_offset (p
, curtype
, this_v
,
3409 tmp
= lookup_pointer_type (TYPE_TARGET_TYPE (type
));
3410 result
= value_from_pointer (tmp
,
3411 value_as_long (v
) + mem_offset
);
3412 return value_ind (result
);
3415 error (_("Cannot reference non-static field \"%s\""), name
);
3420 /* C++: If it was not found as a data field, then try to return it
3421 as a pointer to a method. */
3423 /* Perform all necessary dereferencing. */
3424 while (intype
&& TYPE_CODE (intype
) == TYPE_CODE_PTR
)
3425 intype
= TYPE_TARGET_TYPE (intype
);
3427 for (i
= TYPE_NFN_FIELDS (t
) - 1; i
>= 0; --i
)
3429 const char *t_field_name
= TYPE_FN_FIELDLIST_NAME (t
, i
);
3430 char dem_opname
[64];
3432 if (startswith (t_field_name
, "__")
3433 || startswith (t_field_name
, "op")
3434 || startswith (t_field_name
, "type"))
3436 if (cplus_demangle_opname (t_field_name
,
3437 dem_opname
, DMGL_ANSI
))
3438 t_field_name
= dem_opname
;
3439 else if (cplus_demangle_opname (t_field_name
,
3441 t_field_name
= dem_opname
;
3443 if (t_field_name
&& strcmp (t_field_name
, name
) == 0)
3446 int len
= TYPE_FN_FIELDLIST_LENGTH (t
, i
);
3447 struct fn_field
*f
= TYPE_FN_FIELDLIST1 (t
, i
);
3449 check_stub_method_group (t
, i
);
3453 for (j
= 0; j
< len
; ++j
)
3455 if (TYPE_CONST (intype
) != TYPE_FN_FIELD_CONST (f
, j
))
3457 if (TYPE_VOLATILE (intype
) != TYPE_FN_FIELD_VOLATILE (f
, j
))
3460 if (compare_parameters (TYPE_FN_FIELD_TYPE (f
, j
), intype
, 0)
3461 || compare_parameters (TYPE_FN_FIELD_TYPE (f
, j
),
3467 error (_("no member function matches "
3468 "that type instantiation"));
3475 for (ii
= 0; ii
< len
; ++ii
)
3477 /* Skip artificial methods. This is necessary if,
3478 for example, the user wants to "print
3479 subclass::subclass" with only one user-defined
3480 constructor. There is no ambiguity in this case.
3481 We are careful here to allow artificial methods
3482 if they are the unique result. */
3483 if (TYPE_FN_FIELD_ARTIFICIAL (f
, ii
))
3490 /* Desired method is ambiguous if more than one
3491 method is defined. */
3492 if (j
!= -1 && !TYPE_FN_FIELD_ARTIFICIAL (f
, j
))
3493 error (_("non-unique member `%s' requires "
3494 "type instantiation"), name
);
3500 error (_("no matching member function"));
3503 if (TYPE_FN_FIELD_STATIC_P (f
, j
))
3506 lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f
, j
),
3507 0, VAR_DOMAIN
, 0).symbol
;
3513 return value_addr (read_var_value (s
, 0, 0));
3515 return read_var_value (s
, 0, 0);
3518 if (TYPE_FN_FIELD_VIRTUAL_P (f
, j
))
3522 result
= allocate_value
3523 (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f
, j
)));
3524 cplus_make_method_ptr (value_type (result
),
3525 value_contents_writeable (result
),
3526 TYPE_FN_FIELD_VOFFSET (f
, j
), 1);
3528 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3529 return allocate_value (TYPE_FN_FIELD_TYPE (f
, j
));
3531 error (_("Cannot reference virtual member function \"%s\""),
3537 lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f
, j
),
3538 0, VAR_DOMAIN
, 0).symbol
;
3543 struct value
*v
= read_var_value (s
, 0, 0);
3548 result
= allocate_value (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f
, j
)));
3549 cplus_make_method_ptr (value_type (result
),
3550 value_contents_writeable (result
),
3551 value_address (v
), 0);
3557 for (i
= TYPE_N_BASECLASSES (t
) - 1; i
>= 0; i
--)
3562 if (BASETYPE_VIA_VIRTUAL (t
, i
))
3565 base_offset
= TYPE_BASECLASS_BITPOS (t
, i
) / 8;
3566 v
= value_struct_elt_for_reference (domain
,
3567 offset
+ base_offset
,
3568 TYPE_BASECLASS (t
, i
),
3570 want_address
, noside
);
3575 /* As a last chance, pretend that CURTYPE is a namespace, and look
3576 it up that way; this (frequently) works for types nested inside
3579 return value_maybe_namespace_elt (curtype
, name
,
3580 want_address
, noside
);
3583 /* C++: Return the member NAME of the namespace given by the type
3586 static struct value
*
3587 value_namespace_elt (const struct type
*curtype
,
3588 const char *name
, int want_address
,
3591 struct value
*retval
= value_maybe_namespace_elt (curtype
, name
,
3596 error (_("No symbol \"%s\" in namespace \"%s\"."),
3597 name
, TYPE_NAME (curtype
));
3602 /* A helper function used by value_namespace_elt and
3603 value_struct_elt_for_reference. It looks up NAME inside the
3604 context CURTYPE; this works if CURTYPE is a namespace or if CURTYPE
3605 is a class and NAME refers to a type in CURTYPE itself (as opposed
3606 to, say, some base class of CURTYPE). */
3608 static struct value
*
3609 value_maybe_namespace_elt (const struct type
*curtype
,
3610 const char *name
, int want_address
,
3613 const char *namespace_name
= TYPE_NAME (curtype
);
3614 struct block_symbol sym
;
3615 struct value
*result
;
3617 sym
= cp_lookup_symbol_namespace (namespace_name
, name
,
3618 get_selected_block (0), VAR_DOMAIN
);
3620 if (sym
.symbol
== NULL
)
3622 else if ((noside
== EVAL_AVOID_SIDE_EFFECTS
)
3623 && (SYMBOL_CLASS (sym
.symbol
) == LOC_TYPEDEF
))
3624 result
= allocate_value (SYMBOL_TYPE (sym
.symbol
));
3626 result
= value_of_variable (sym
.symbol
, sym
.block
);
3629 result
= value_addr (result
);
3634 /* Given a pointer or a reference value V, find its real (RTTI) type.
3636 Other parameters FULL, TOP, USING_ENC as with value_rtti_type()
3637 and refer to the values computed for the object pointed to. */
3640 value_rtti_indirect_type (struct value
*v
, int *full
,
3641 LONGEST
*top
, int *using_enc
)
3643 struct value
*target
= NULL
;
3644 struct type
*type
, *real_type
, *target_type
;
3646 type
= value_type (v
);
3647 type
= check_typedef (type
);
3648 if (TYPE_IS_REFERENCE (type
))
3649 target
= coerce_ref (v
);
3650 else if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
3655 target
= value_ind (v
);
3657 CATCH (except
, RETURN_MASK_ERROR
)
3659 if (except
.error
== MEMORY_ERROR
)
3661 /* value_ind threw a memory error. The pointer is NULL or
3662 contains an uninitialized value: we can't determine any
3666 throw_exception (except
);
3673 real_type
= value_rtti_type (target
, full
, top
, using_enc
);
3677 /* Copy qualifiers to the referenced object. */
3678 target_type
= value_type (target
);
3679 real_type
= make_cv_type (TYPE_CONST (target_type
),
3680 TYPE_VOLATILE (target_type
), real_type
, NULL
);
3681 if (TYPE_IS_REFERENCE (type
))
3682 real_type
= lookup_reference_type (real_type
, TYPE_CODE (type
));
3683 else if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
3684 real_type
= lookup_pointer_type (real_type
);
3686 internal_error (__FILE__
, __LINE__
, _("Unexpected value type."));
3688 /* Copy qualifiers to the pointer/reference. */
3689 real_type
= make_cv_type (TYPE_CONST (type
), TYPE_VOLATILE (type
),
3696 /* Given a value pointed to by ARGP, check its real run-time type, and
3697 if that is different from the enclosing type, create a new value
3698 using the real run-time type as the enclosing type (and of the same
3699 type as ARGP) and return it, with the embedded offset adjusted to
3700 be the correct offset to the enclosed object. RTYPE is the type,
3701 and XFULL, XTOP, and XUSING_ENC are the other parameters, computed
3702 by value_rtti_type(). If these are available, they can be supplied
3703 and a second call to value_rtti_type() is avoided. (Pass RTYPE ==
3704 NULL if they're not available. */
3707 value_full_object (struct value
*argp
,
3709 int xfull
, int xtop
,
3712 struct type
*real_type
;
3716 struct value
*new_val
;
3723 using_enc
= xusing_enc
;
3726 real_type
= value_rtti_type (argp
, &full
, &top
, &using_enc
);
3728 /* If no RTTI data, or if object is already complete, do nothing. */
3729 if (!real_type
|| real_type
== value_enclosing_type (argp
))
3732 /* In a destructor we might see a real type that is a superclass of
3733 the object's type. In this case it is better to leave the object
3736 && TYPE_LENGTH (real_type
) < TYPE_LENGTH (value_enclosing_type (argp
)))
3739 /* If we have the full object, but for some reason the enclosing
3740 type is wrong, set it. */
3741 /* pai: FIXME -- sounds iffy */
3744 argp
= value_copy (argp
);
3745 set_value_enclosing_type (argp
, real_type
);
3749 /* Check if object is in memory. */
3750 if (VALUE_LVAL (argp
) != lval_memory
)
3752 warning (_("Couldn't retrieve complete object of RTTI "
3753 "type %s; object may be in register(s)."),
3754 TYPE_NAME (real_type
));
3759 /* All other cases -- retrieve the complete object. */
3760 /* Go back by the computed top_offset from the beginning of the
3761 object, adjusting for the embedded offset of argp if that's what
3762 value_rtti_type used for its computation. */
3763 new_val
= value_at_lazy (real_type
, value_address (argp
) - top
+
3764 (using_enc
? 0 : value_embedded_offset (argp
)));
3765 deprecated_set_value_type (new_val
, value_type (argp
));
3766 set_value_embedded_offset (new_val
, (using_enc
3767 ? top
+ value_embedded_offset (argp
)
3773 /* Return the value of the local variable, if one exists. Throw error
3774 otherwise, such as if the request is made in an inappropriate context. */
3777 value_of_this (const struct language_defn
*lang
)
3779 struct block_symbol sym
;
3780 const struct block
*b
;
3781 struct frame_info
*frame
;
3783 if (!lang
->la_name_of_this
)
3784 error (_("no `this' in current language"));
3786 frame
= get_selected_frame (_("no frame selected"));
3788 b
= get_frame_block (frame
, NULL
);
3790 sym
= lookup_language_this (lang
, b
);
3791 if (sym
.symbol
== NULL
)
3792 error (_("current stack frame does not contain a variable named `%s'"),
3793 lang
->la_name_of_this
);
3795 return read_var_value (sym
.symbol
, sym
.block
, frame
);
3798 /* Return the value of the local variable, if one exists. Return NULL
3799 otherwise. Never throw error. */
3802 value_of_this_silent (const struct language_defn
*lang
)
3804 struct value
*ret
= NULL
;
3808 ret
= value_of_this (lang
);
3810 CATCH (except
, RETURN_MASK_ERROR
)
3818 /* Create a slice (sub-string, sub-array) of ARRAY, that is LENGTH
3819 elements long, starting at LOWBOUND. The result has the same lower
3820 bound as the original ARRAY. */
3823 value_slice (struct value
*array
, int lowbound
, int length
)
3825 struct type
*slice_range_type
, *slice_type
, *range_type
;
3826 LONGEST lowerbound
, upperbound
;
3827 struct value
*slice
;
3828 struct type
*array_type
;
3830 array_type
= check_typedef (value_type (array
));
3831 if (TYPE_CODE (array_type
) != TYPE_CODE_ARRAY
3832 && TYPE_CODE (array_type
) != TYPE_CODE_STRING
)
3833 error (_("cannot take slice of non-array"));
3835 range_type
= TYPE_INDEX_TYPE (array_type
);
3836 if (get_discrete_bounds (range_type
, &lowerbound
, &upperbound
) < 0)
3837 error (_("slice from bad array or bitstring"));
3839 if (lowbound
< lowerbound
|| length
< 0
3840 || lowbound
+ length
- 1 > upperbound
)
3841 error (_("slice out of range"));
3843 /* FIXME-type-allocation: need a way to free this type when we are
3845 slice_range_type
= create_static_range_type ((struct type
*) NULL
,
3846 TYPE_TARGET_TYPE (range_type
),
3848 lowbound
+ length
- 1);
3851 struct type
*element_type
= TYPE_TARGET_TYPE (array_type
);
3853 = (lowbound
- lowerbound
) * TYPE_LENGTH (check_typedef (element_type
));
3855 slice_type
= create_array_type ((struct type
*) NULL
,
3858 TYPE_CODE (slice_type
) = TYPE_CODE (array_type
);
3860 if (VALUE_LVAL (array
) == lval_memory
&& value_lazy (array
))
3861 slice
= allocate_value_lazy (slice_type
);
3864 slice
= allocate_value (slice_type
);
3865 value_contents_copy (slice
, 0, array
, offset
,
3866 type_length_units (slice_type
));
3869 set_value_component_location (slice
, array
);
3870 set_value_offset (slice
, value_offset (array
) + offset
);
3876 /* Create a value for a FORTRAN complex number. Currently most of the
3877 time values are coerced to COMPLEX*16 (i.e. a complex number
3878 composed of 2 doubles. This really should be a smarter routine
3879 that figures out precision inteligently as opposed to assuming
3880 doubles. FIXME: fmb */
3883 value_literal_complex (struct value
*arg1
,
3888 struct type
*real_type
= TYPE_TARGET_TYPE (type
);
3890 val
= allocate_value (type
);
3891 arg1
= value_cast (real_type
, arg1
);
3892 arg2
= value_cast (real_type
, arg2
);
3894 memcpy (value_contents_raw (val
),
3895 value_contents (arg1
), TYPE_LENGTH (real_type
));
3896 memcpy (value_contents_raw (val
) + TYPE_LENGTH (real_type
),
3897 value_contents (arg2
), TYPE_LENGTH (real_type
));
3901 /* Cast a value into the appropriate complex data type. */
3903 static struct value
*
3904 cast_into_complex (struct type
*type
, struct value
*val
)
3906 struct type
*real_type
= TYPE_TARGET_TYPE (type
);
3908 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_COMPLEX
)
3910 struct type
*val_real_type
= TYPE_TARGET_TYPE (value_type (val
));
3911 struct value
*re_val
= allocate_value (val_real_type
);
3912 struct value
*im_val
= allocate_value (val_real_type
);
3914 memcpy (value_contents_raw (re_val
),
3915 value_contents (val
), TYPE_LENGTH (val_real_type
));
3916 memcpy (value_contents_raw (im_val
),
3917 value_contents (val
) + TYPE_LENGTH (val_real_type
),
3918 TYPE_LENGTH (val_real_type
));
3920 return value_literal_complex (re_val
, im_val
, type
);
3922 else if (TYPE_CODE (value_type (val
)) == TYPE_CODE_FLT
3923 || TYPE_CODE (value_type (val
)) == TYPE_CODE_INT
)
3924 return value_literal_complex (val
,
3925 value_zero (real_type
, not_lval
),
3928 error (_("cannot cast non-number to complex"));
3932 _initialize_valops (void)
3934 add_setshow_boolean_cmd ("overload-resolution", class_support
,
3935 &overload_resolution
, _("\
3936 Set overload resolution in evaluating C++ functions."), _("\
3937 Show overload resolution in evaluating C++ functions."),
3939 show_overload_resolution
,
3940 &setlist
, &showlist
);
3941 overload_resolution
= 1;