1 /* Perform non-arithmetic operations on values, for GDB.
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
5 2008, 2009 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
37 #include "dictionary.h"
38 #include "cp-support.h"
40 #include "user-regs.h"
43 #include "gdb_string.h"
44 #include "gdb_assert.h"
45 #include "cp-support.h"
50 extern int overload_debug;
51 /* Local functions. */
53 static int typecmp (int staticp, int varargs, int nargs,
54 struct field t1[], struct value *t2[]);
56 static struct value *search_struct_field (char *, struct value *,
57 int, struct type *, int);
59 static struct value *search_struct_method (char *, struct value **,
61 int, int *, struct type *);
63 static int find_oload_champ_namespace (struct type **, int,
64 const char *, const char *,
66 struct badness_vector **);
69 int find_oload_champ_namespace_loop (struct type **, int,
70 const char *, const char *,
71 int, struct symbol ***,
72 struct badness_vector **, int *);
74 static int find_oload_champ (struct type **, int, int, int,
75 struct fn_field *, struct symbol **,
76 struct badness_vector **);
78 static int oload_method_static (int, struct fn_field *, int);
80 enum oload_classification { STANDARD, NON_STANDARD, INCOMPATIBLE };
83 oload_classification classify_oload_match (struct badness_vector *,
86 static struct value *value_struct_elt_for_reference (struct type *,
92 static struct value *value_namespace_elt (const struct type *,
93 char *, int , enum noside);
95 static struct value *value_maybe_namespace_elt (const struct type *,
99 static CORE_ADDR allocate_space_in_inferior (int);
101 static struct value *cast_into_complex (struct type *, struct value *);
103 static struct fn_field *find_method_list (struct value **, char *,
104 int, struct type *, int *,
105 struct type **, int *);
107 void _initialize_valops (void);
110 /* Flag for whether we want to abandon failed expression evals by
113 static int auto_abandon = 0;
116 int overload_resolution = 0;
118 show_overload_resolution (struct ui_file *file, int from_tty,
119 struct cmd_list_element *c,
122 fprintf_filtered (file, _("\
123 Overload resolution in evaluating C++ functions is %s.\n"),
127 /* Find the address of function name NAME in the inferior. If OBJF_P
128 is non-NULL, *OBJF_P will be set to the OBJFILE where the function
132 find_function_in_inferior (const char *name, struct objfile **objf_p)
135 sym = lookup_symbol (name, 0, VAR_DOMAIN, 0);
138 if (SYMBOL_CLASS (sym) != LOC_BLOCK)
140 error (_("\"%s\" exists in this program but is not a function."),
145 *objf_p = SYMBOL_SYMTAB (sym)->objfile;
147 return value_of_variable (sym, NULL);
151 struct minimal_symbol *msymbol =
152 lookup_minimal_symbol (name, NULL, NULL);
155 struct objfile *objfile = msymbol_objfile (msymbol);
156 struct gdbarch *gdbarch = get_objfile_arch (objfile);
160 type = lookup_pointer_type (builtin_type (gdbarch)->builtin_char);
161 type = lookup_function_type (type);
162 type = lookup_pointer_type (type);
163 maddr = SYMBOL_VALUE_ADDRESS (msymbol);
168 return value_from_pointer (type, maddr);
172 if (!target_has_execution)
173 error (_("evaluation of this expression requires the target program to be active"));
175 error (_("evaluation of this expression requires the program to have a function \"%s\"."), name);
180 /* Allocate NBYTES of space in the inferior using the inferior's
181 malloc and return a value that is a pointer to the allocated
185 value_allocate_space_in_inferior (int len)
187 struct objfile *objf;
188 struct value *val = find_function_in_inferior ("malloc", &objf);
189 struct gdbarch *gdbarch = get_objfile_arch (objf);
190 struct value *blocklen;
192 blocklen = value_from_longest (builtin_type (gdbarch)->builtin_int, len);
193 val = call_function_by_hand (val, 1, &blocklen);
194 if (value_logical_not (val))
196 if (!target_has_execution)
197 error (_("No memory available to program now: you need to start the target first"));
199 error (_("No memory available to program: call to malloc failed"));
205 allocate_space_in_inferior (int len)
207 return value_as_long (value_allocate_space_in_inferior (len));
210 /* Cast struct value VAL to type TYPE and return as a value.
211 Both type and val must be of TYPE_CODE_STRUCT or TYPE_CODE_UNION
212 for this to work. Typedef to one of the codes is permitted.
213 Returns NULL if the cast is neither an upcast nor a downcast. */
215 static struct value *
216 value_cast_structs (struct type *type, struct value *v2)
222 gdb_assert (type != NULL && v2 != NULL);
224 t1 = check_typedef (type);
225 t2 = check_typedef (value_type (v2));
227 /* Check preconditions. */
228 gdb_assert ((TYPE_CODE (t1) == TYPE_CODE_STRUCT
229 || TYPE_CODE (t1) == TYPE_CODE_UNION)
230 && !!"Precondition is that type is of STRUCT or UNION kind.");
231 gdb_assert ((TYPE_CODE (t2) == TYPE_CODE_STRUCT
232 || TYPE_CODE (t2) == TYPE_CODE_UNION)
233 && !!"Precondition is that value is of STRUCT or UNION kind");
235 /* Upcasting: look in the type of the source to see if it contains the
236 type of the target as a superclass. If so, we'll need to
237 offset the pointer rather than just change its type. */
238 if (TYPE_NAME (t1) != NULL)
240 v = search_struct_field (type_name_no_tag (t1),
246 /* Downcasting: look in the type of the target to see if it contains the
247 type of the source as a superclass. If so, we'll need to
248 offset the pointer rather than just change its type.
249 FIXME: This fails silently with virtual inheritance. */
250 if (TYPE_NAME (t2) != NULL)
252 v = search_struct_field (type_name_no_tag (t2),
253 value_zero (t1, not_lval), 0, t1, 1);
256 /* Downcasting is possible (t1 is superclass of v2). */
257 CORE_ADDR addr2 = VALUE_ADDRESS (v2);
258 addr2 -= (VALUE_ADDRESS (v)
260 + value_embedded_offset (v));
261 return value_at (type, addr2);
268 /* Cast one pointer or reference type to another. Both TYPE and
269 the type of ARG2 should be pointer types, or else both should be
270 reference types. Returns the new pointer or reference. */
273 value_cast_pointers (struct type *type, struct value *arg2)
275 struct type *type1 = check_typedef (type);
276 struct type *type2 = check_typedef (value_type (arg2));
277 struct type *t1 = check_typedef (TYPE_TARGET_TYPE (type));
278 struct type *t2 = check_typedef (TYPE_TARGET_TYPE (type2));
280 if (TYPE_CODE (t1) == TYPE_CODE_STRUCT
281 && TYPE_CODE (t2) == TYPE_CODE_STRUCT
282 && !value_logical_not (arg2))
286 if (TYPE_CODE (type2) == TYPE_CODE_REF)
287 v2 = coerce_ref (arg2);
289 v2 = value_ind (arg2);
290 gdb_assert (TYPE_CODE (check_typedef (value_type (v2))) == TYPE_CODE_STRUCT
291 && !!"Why did coercion fail?");
292 v2 = value_cast_structs (t1, v2);
293 /* At this point we have what we can have, un-dereference if needed. */
296 struct value *v = value_addr (v2);
297 deprecated_set_value_type (v, type);
302 /* No superclass found, just change the pointer type. */
303 arg2 = value_copy (arg2);
304 deprecated_set_value_type (arg2, type);
305 arg2 = value_change_enclosing_type (arg2, type);
306 set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */
310 /* Cast value ARG2 to type TYPE and return as a value.
311 More general than a C cast: accepts any two types of the same length,
312 and if ARG2 is an lvalue it can be cast into anything at all. */
313 /* In C++, casts may change pointer or object representations. */
316 value_cast (struct type *type, struct value *arg2)
318 enum type_code code1;
319 enum type_code code2;
323 int convert_to_boolean = 0;
325 if (value_type (arg2) == type)
328 code1 = TYPE_CODE (check_typedef (type));
330 /* Check if we are casting struct reference to struct reference. */
331 if (code1 == TYPE_CODE_REF)
333 /* We dereference type; then we recurse and finally
334 we generate value of the given reference. Nothing wrong with
336 struct type *t1 = check_typedef (type);
337 struct type *dereftype = check_typedef (TYPE_TARGET_TYPE (t1));
338 struct value *val = value_cast (dereftype, arg2);
339 return value_ref (val);
342 code2 = TYPE_CODE (check_typedef (value_type (arg2)));
344 if (code2 == TYPE_CODE_REF)
345 /* We deref the value and then do the cast. */
346 return value_cast (type, coerce_ref (arg2));
348 CHECK_TYPEDEF (type);
349 code1 = TYPE_CODE (type);
350 arg2 = coerce_ref (arg2);
351 type2 = check_typedef (value_type (arg2));
353 /* You can't cast to a reference type. See value_cast_pointers
355 gdb_assert (code1 != TYPE_CODE_REF);
357 /* A cast to an undetermined-length array_type, such as
358 (TYPE [])OBJECT, is treated like a cast to (TYPE [N])OBJECT,
359 where N is sizeof(OBJECT)/sizeof(TYPE). */
360 if (code1 == TYPE_CODE_ARRAY)
362 struct type *element_type = TYPE_TARGET_TYPE (type);
363 unsigned element_length = TYPE_LENGTH (check_typedef (element_type));
364 if (element_length > 0 && TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))
366 struct type *range_type = TYPE_INDEX_TYPE (type);
367 int val_length = TYPE_LENGTH (type2);
368 LONGEST low_bound, high_bound, new_length;
369 if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
370 low_bound = 0, high_bound = 0;
371 new_length = val_length / element_length;
372 if (val_length % element_length != 0)
373 warning (_("array element type size does not divide object size in cast"));
374 /* FIXME-type-allocation: need a way to free this type when
375 we are done with it. */
376 range_type = create_range_type ((struct type *) NULL,
377 TYPE_TARGET_TYPE (range_type),
379 new_length + low_bound - 1);
380 deprecated_set_value_type (arg2,
381 create_array_type ((struct type *) NULL,
388 if (current_language->c_style_arrays
389 && TYPE_CODE (type2) == TYPE_CODE_ARRAY)
390 arg2 = value_coerce_array (arg2);
392 if (TYPE_CODE (type2) == TYPE_CODE_FUNC)
393 arg2 = value_coerce_function (arg2);
395 type2 = check_typedef (value_type (arg2));
396 code2 = TYPE_CODE (type2);
398 if (code1 == TYPE_CODE_COMPLEX)
399 return cast_into_complex (type, arg2);
400 if (code1 == TYPE_CODE_BOOL)
402 code1 = TYPE_CODE_INT;
403 convert_to_boolean = 1;
405 if (code1 == TYPE_CODE_CHAR)
406 code1 = TYPE_CODE_INT;
407 if (code2 == TYPE_CODE_BOOL || code2 == TYPE_CODE_CHAR)
408 code2 = TYPE_CODE_INT;
410 scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT
411 || code2 == TYPE_CODE_DECFLOAT || code2 == TYPE_CODE_ENUM
412 || code2 == TYPE_CODE_RANGE);
414 if ((code1 == TYPE_CODE_STRUCT || code1 == TYPE_CODE_UNION)
415 && (code2 == TYPE_CODE_STRUCT || code2 == TYPE_CODE_UNION)
416 && TYPE_NAME (type) != 0)
418 struct value *v = value_cast_structs (type, arg2);
423 if (code1 == TYPE_CODE_FLT && scalar)
424 return value_from_double (type, value_as_double (arg2));
425 else if (code1 == TYPE_CODE_DECFLOAT && scalar)
427 int dec_len = TYPE_LENGTH (type);
430 if (code2 == TYPE_CODE_FLT)
431 decimal_from_floating (arg2, dec, dec_len);
432 else if (code2 == TYPE_CODE_DECFLOAT)
433 decimal_convert (value_contents (arg2), TYPE_LENGTH (type2),
436 /* The only option left is an integral type. */
437 decimal_from_integral (arg2, dec, dec_len);
439 return value_from_decfloat (type, dec);
441 else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM
442 || code1 == TYPE_CODE_RANGE)
443 && (scalar || code2 == TYPE_CODE_PTR
444 || code2 == TYPE_CODE_MEMBERPTR))
448 /* When we cast pointers to integers, we mustn't use
449 gdbarch_pointer_to_address to find the address the pointer
450 represents, as value_as_long would. GDB should evaluate
451 expressions just as the compiler would --- and the compiler
452 sees a cast as a simple reinterpretation of the pointer's
454 if (code2 == TYPE_CODE_PTR)
455 longest = extract_unsigned_integer (value_contents (arg2),
456 TYPE_LENGTH (type2));
458 longest = value_as_long (arg2);
459 return value_from_longest (type, convert_to_boolean ?
460 (LONGEST) (longest ? 1 : 0) : longest);
462 else if (code1 == TYPE_CODE_PTR && (code2 == TYPE_CODE_INT
463 || code2 == TYPE_CODE_ENUM
464 || code2 == TYPE_CODE_RANGE))
466 /* TYPE_LENGTH (type) is the length of a pointer, but we really
467 want the length of an address! -- we are really dealing with
468 addresses (i.e., gdb representations) not pointers (i.e.,
469 target representations) here.
471 This allows things like "print *(int *)0x01000234" to work
472 without printing a misleading message -- which would
473 otherwise occur when dealing with a target having two byte
474 pointers and four byte addresses. */
476 int addr_bit = gdbarch_addr_bit (current_gdbarch);
478 LONGEST longest = value_as_long (arg2);
479 if (addr_bit < sizeof (LONGEST) * HOST_CHAR_BIT)
481 if (longest >= ((LONGEST) 1 << addr_bit)
482 || longest <= -((LONGEST) 1 << addr_bit))
483 warning (_("value truncated"));
485 return value_from_longest (type, longest);
487 else if (code1 == TYPE_CODE_METHODPTR && code2 == TYPE_CODE_INT
488 && value_as_long (arg2) == 0)
490 struct value *result = allocate_value (type);
491 cplus_make_method_ptr (type, value_contents_writeable (result), 0, 0);
494 else if (code1 == TYPE_CODE_MEMBERPTR && code2 == TYPE_CODE_INT
495 && value_as_long (arg2) == 0)
497 /* The Itanium C++ ABI represents NULL pointers to members as
498 minus one, instead of biasing the normal case. */
499 return value_from_longest (type, -1);
501 else if (TYPE_LENGTH (type) == TYPE_LENGTH (type2))
503 if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
504 return value_cast_pointers (type, arg2);
506 arg2 = value_copy (arg2);
507 deprecated_set_value_type (arg2, type);
508 arg2 = value_change_enclosing_type (arg2, type);
509 set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */
512 else if (VALUE_LVAL (arg2) == lval_memory)
513 return value_at_lazy (type,
514 VALUE_ADDRESS (arg2) + value_offset (arg2));
515 else if (code1 == TYPE_CODE_VOID)
517 return value_zero (builtin_type_void, not_lval);
521 error (_("Invalid cast."));
526 /* Create a value of type TYPE that is zero, and return it. */
529 value_zero (struct type *type, enum lval_type lv)
531 struct value *val = allocate_value (type);
532 VALUE_LVAL (val) = lv;
537 /* Create a value of numeric type TYPE that is one, and return it. */
540 value_one (struct type *type, enum lval_type lv)
542 struct type *type1 = check_typedef (type);
543 struct value *val = NULL; /* avoid -Wall warning */
545 if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
547 struct value *int_one = value_from_longest (builtin_type_int32, 1);
551 decimal_from_integral (int_one, v, TYPE_LENGTH (builtin_type_int32));
552 val = value_from_decfloat (type, v);
554 else if (TYPE_CODE (type1) == TYPE_CODE_FLT)
556 val = value_from_double (type, (DOUBLEST) 1);
558 else if (is_integral_type (type1))
560 val = value_from_longest (type, (LONGEST) 1);
564 error (_("Not a numeric type."));
567 VALUE_LVAL (val) = lv;
571 /* Return a value with type TYPE located at ADDR.
573 Call value_at only if the data needs to be fetched immediately;
574 if we can be 'lazy' and defer the fetch, perhaps indefinately, call
575 value_at_lazy instead. value_at_lazy simply records the address of
576 the data and sets the lazy-evaluation-required flag. The lazy flag
577 is tested in the value_contents macro, which is used if and when
578 the contents are actually required.
580 Note: value_at does *NOT* handle embedded offsets; perform such
581 adjustments before or after calling it. */
584 value_at (struct type *type, CORE_ADDR addr)
588 if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID)
589 error (_("Attempt to dereference a generic pointer."));
591 val = allocate_value (type);
593 read_memory (addr, value_contents_all_raw (val), TYPE_LENGTH (type));
595 VALUE_LVAL (val) = lval_memory;
596 VALUE_ADDRESS (val) = addr;
601 /* Return a lazy value with type TYPE located at ADDR (cf. value_at). */
604 value_at_lazy (struct type *type, CORE_ADDR addr)
608 if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID)
609 error (_("Attempt to dereference a generic pointer."));
611 val = allocate_value_lazy (type);
613 VALUE_LVAL (val) = lval_memory;
614 VALUE_ADDRESS (val) = addr;
619 /* Called only from the value_contents and value_contents_all()
620 macros, if the current data for a variable needs to be loaded into
621 value_contents(VAL). Fetches the data from the user's process, and
622 clears the lazy flag to indicate that the data in the buffer is
625 If the value is zero-length, we avoid calling read_memory, which
626 would abort. We mark the value as fetched anyway -- all 0 bytes of
629 This function returns a value because it is used in the
630 value_contents macro as part of an expression, where a void would
631 not work. The value is ignored. */
634 value_fetch_lazy (struct value *val)
636 gdb_assert (value_lazy (val));
637 allocate_value_contents (val);
638 if (VALUE_LVAL (val) == lval_memory)
640 CORE_ADDR addr = VALUE_ADDRESS (val) + value_offset (val);
641 int length = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
644 read_memory (addr, value_contents_all_raw (val), length);
646 else if (VALUE_LVAL (val) == lval_register)
648 struct frame_info *frame;
650 struct type *type = check_typedef (value_type (val));
651 struct value *new_val = val, *mark = value_mark ();
653 /* Offsets are not supported here; lazy register values must
654 refer to the entire register. */
655 gdb_assert (value_offset (val) == 0);
657 while (VALUE_LVAL (new_val) == lval_register && value_lazy (new_val))
659 frame = frame_find_by_id (VALUE_FRAME_ID (new_val));
660 regnum = VALUE_REGNUM (new_val);
662 gdb_assert (frame != NULL);
664 /* Convertible register routines are used for multi-register
665 values and for interpretation in different types
666 (e.g. float or int from a double register). Lazy
667 register values should have the register's natural type,
668 so they do not apply. */
669 gdb_assert (!gdbarch_convert_register_p (get_frame_arch (frame),
672 new_val = get_frame_register_value (frame, regnum);
675 /* If it's still lazy (for instance, a saved register on the
677 if (value_lazy (new_val))
678 value_fetch_lazy (new_val);
680 /* If the register was not saved, mark it unavailable. */
681 if (value_optimized_out (new_val))
682 set_value_optimized_out (val, 1);
684 memcpy (value_contents_raw (val), value_contents (new_val),
689 struct gdbarch *gdbarch;
690 frame = frame_find_by_id (VALUE_FRAME_ID (val));
691 regnum = VALUE_REGNUM (val);
692 gdbarch = get_frame_arch (frame);
694 fprintf_unfiltered (gdb_stdlog, "\
695 { value_fetch_lazy (frame=%d,regnum=%d(%s),...) ",
696 frame_relative_level (frame), regnum,
697 user_reg_map_regnum_to_name (gdbarch, regnum));
699 fprintf_unfiltered (gdb_stdlog, "->");
700 if (value_optimized_out (new_val))
701 fprintf_unfiltered (gdb_stdlog, " optimized out");
705 const gdb_byte *buf = value_contents (new_val);
707 if (VALUE_LVAL (new_val) == lval_register)
708 fprintf_unfiltered (gdb_stdlog, " register=%d",
709 VALUE_REGNUM (new_val));
710 else if (VALUE_LVAL (new_val) == lval_memory)
711 fprintf_unfiltered (gdb_stdlog, " address=0x%s",
712 paddr_nz (VALUE_ADDRESS (new_val)));
714 fprintf_unfiltered (gdb_stdlog, " computed");
716 fprintf_unfiltered (gdb_stdlog, " bytes=");
717 fprintf_unfiltered (gdb_stdlog, "[");
718 for (i = 0; i < register_size (gdbarch, regnum); i++)
719 fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
720 fprintf_unfiltered (gdb_stdlog, "]");
723 fprintf_unfiltered (gdb_stdlog, " }\n");
726 /* Dispose of the intermediate values. This prevents
727 watchpoints from trying to watch the saved frame pointer. */
728 value_free_to_mark (mark);
731 internal_error (__FILE__, __LINE__, "Unexpected lazy value type.");
733 set_value_lazy (val, 0);
738 /* Store the contents of FROMVAL into the location of TOVAL.
739 Return a new value with the location of TOVAL and contents of FROMVAL. */
742 value_assign (struct value *toval, struct value *fromval)
746 struct frame_id old_frame;
748 if (!deprecated_value_modifiable (toval))
749 error (_("Left operand of assignment is not a modifiable lvalue."));
751 toval = coerce_ref (toval);
753 type = value_type (toval);
754 if (VALUE_LVAL (toval) != lval_internalvar)
756 toval = value_coerce_to_target (toval);
757 fromval = value_cast (type, fromval);
761 /* Coerce arrays and functions to pointers, except for arrays
762 which only live in GDB's storage. */
763 if (!value_must_coerce_to_target (fromval))
764 fromval = coerce_array (fromval);
767 CHECK_TYPEDEF (type);
769 /* Since modifying a register can trash the frame chain, and
770 modifying memory can trash the frame cache, we save the old frame
771 and then restore the new frame afterwards. */
772 old_frame = get_frame_id (deprecated_safe_get_selected_frame ());
774 switch (VALUE_LVAL (toval))
776 case lval_internalvar:
777 set_internalvar (VALUE_INTERNALVAR (toval), fromval);
778 val = value_copy (VALUE_INTERNALVAR (toval)->value);
779 val = value_change_enclosing_type (val,
780 value_enclosing_type (fromval));
781 set_value_embedded_offset (val, value_embedded_offset (fromval));
782 set_value_pointed_to_offset (val,
783 value_pointed_to_offset (fromval));
786 case lval_internalvar_component:
787 set_internalvar_component (VALUE_INTERNALVAR (toval),
788 value_offset (toval),
789 value_bitpos (toval),
790 value_bitsize (toval),
796 const gdb_byte *dest_buffer;
797 CORE_ADDR changed_addr;
799 gdb_byte buffer[sizeof (LONGEST)];
801 if (value_bitsize (toval))
803 /* We assume that the argument to read_memory is in units
804 of host chars. FIXME: Is that correct? */
805 changed_len = (value_bitpos (toval)
806 + value_bitsize (toval)
810 if (changed_len > (int) sizeof (LONGEST))
811 error (_("Can't handle bitfields which don't fit in a %d bit word."),
812 (int) sizeof (LONGEST) * HOST_CHAR_BIT);
814 read_memory (VALUE_ADDRESS (toval) + value_offset (toval),
815 buffer, changed_len);
816 modify_field (buffer, value_as_long (fromval),
817 value_bitpos (toval), value_bitsize (toval));
818 changed_addr = VALUE_ADDRESS (toval) + value_offset (toval);
819 dest_buffer = buffer;
823 changed_addr = VALUE_ADDRESS (toval) + value_offset (toval);
824 changed_len = TYPE_LENGTH (type);
825 dest_buffer = value_contents (fromval);
828 write_memory (changed_addr, dest_buffer, changed_len);
829 if (deprecated_memory_changed_hook)
830 deprecated_memory_changed_hook (changed_addr, changed_len);
836 struct frame_info *frame;
839 /* Figure out which frame this is in currently. */
840 frame = frame_find_by_id (VALUE_FRAME_ID (toval));
841 value_reg = VALUE_REGNUM (toval);
844 error (_("Value being assigned to is no longer active."));
846 if (gdbarch_convert_register_p
847 (current_gdbarch, VALUE_REGNUM (toval), type))
849 /* If TOVAL is a special machine register requiring
850 conversion of program values to a special raw
852 gdbarch_value_to_register (current_gdbarch, frame,
853 VALUE_REGNUM (toval), type,
854 value_contents (fromval));
858 if (value_bitsize (toval))
861 gdb_byte buffer[sizeof (LONGEST)];
863 changed_len = (value_bitpos (toval)
864 + value_bitsize (toval)
868 if (changed_len > (int) sizeof (LONGEST))
869 error (_("Can't handle bitfields which don't fit in a %d bit word."),
870 (int) sizeof (LONGEST) * HOST_CHAR_BIT);
872 get_frame_register_bytes (frame, value_reg,
873 value_offset (toval),
874 changed_len, buffer);
876 modify_field (buffer, value_as_long (fromval),
877 value_bitpos (toval),
878 value_bitsize (toval));
880 put_frame_register_bytes (frame, value_reg,
881 value_offset (toval),
882 changed_len, buffer);
886 put_frame_register_bytes (frame, value_reg,
887 value_offset (toval),
889 value_contents (fromval));
893 if (deprecated_register_changed_hook)
894 deprecated_register_changed_hook (-1);
895 observer_notify_target_changed (¤t_target);
900 error (_("Left operand of assignment is not an lvalue."));
903 /* Assigning to the stack pointer, frame pointer, and other
904 (architecture and calling convention specific) registers may
905 cause the frame cache to be out of date. Assigning to memory
906 also can. We just do this on all assignments to registers or
907 memory, for simplicity's sake; I doubt the slowdown matters. */
908 switch (VALUE_LVAL (toval))
913 reinit_frame_cache ();
915 /* Having destroyed the frame cache, restore the selected
918 /* FIXME: cagney/2002-11-02: There has to be a better way of
919 doing this. Instead of constantly saving/restoring the
920 frame. Why not create a get_selected_frame() function that,
921 having saved the selected frame's ID can automatically
922 re-find the previously selected frame automatically. */
925 struct frame_info *fi = frame_find_by_id (old_frame);
935 /* If the field does not entirely fill a LONGEST, then zero the sign
936 bits. If the field is signed, and is negative, then sign
938 if ((value_bitsize (toval) > 0)
939 && (value_bitsize (toval) < 8 * (int) sizeof (LONGEST)))
941 LONGEST fieldval = value_as_long (fromval);
942 LONGEST valmask = (((ULONGEST) 1) << value_bitsize (toval)) - 1;
945 if (!TYPE_UNSIGNED (type)
946 && (fieldval & (valmask ^ (valmask >> 1))))
947 fieldval |= ~valmask;
949 fromval = value_from_longest (type, fieldval);
952 val = value_copy (toval);
953 memcpy (value_contents_raw (val), value_contents (fromval),
955 deprecated_set_value_type (val, type);
956 val = value_change_enclosing_type (val,
957 value_enclosing_type (fromval));
958 set_value_embedded_offset (val, value_embedded_offset (fromval));
959 set_value_pointed_to_offset (val, value_pointed_to_offset (fromval));
964 /* Extend a value VAL to COUNT repetitions of its type. */
967 value_repeat (struct value *arg1, int count)
971 if (VALUE_LVAL (arg1) != lval_memory)
972 error (_("Only values in memory can be extended with '@'."));
974 error (_("Invalid number %d of repetitions."), count);
976 val = allocate_repeat_value (value_enclosing_type (arg1), count);
978 read_memory (VALUE_ADDRESS (arg1) + value_offset (arg1),
979 value_contents_all_raw (val),
980 TYPE_LENGTH (value_enclosing_type (val)));
981 VALUE_LVAL (val) = lval_memory;
982 VALUE_ADDRESS (val) = VALUE_ADDRESS (arg1) + value_offset (arg1);
988 value_of_variable (struct symbol *var, struct block *b)
991 struct frame_info *frame;
993 if (!symbol_read_needs_frame (var))
996 frame = get_selected_frame (_("No frame selected."));
999 frame = block_innermost_frame (b);
1002 if (BLOCK_FUNCTION (b)
1003 && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)))
1004 error (_("No frame is currently executing in block %s."),
1005 SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)));
1007 error (_("No frame is currently executing in specified block"));
1011 val = read_var_value (var, frame);
1013 error (_("Address of symbol \"%s\" is unknown."), SYMBOL_PRINT_NAME (var));
1019 address_of_variable (struct symbol *var, struct block *b)
1021 struct type *type = SYMBOL_TYPE (var);
1024 /* Evaluate it first; if the result is a memory address, we're fine.
1025 Lazy evaluation pays off here. */
1027 val = value_of_variable (var, b);
1029 if ((VALUE_LVAL (val) == lval_memory && value_lazy (val))
1030 || TYPE_CODE (type) == TYPE_CODE_FUNC)
1032 CORE_ADDR addr = VALUE_ADDRESS (val);
1033 return value_from_pointer (lookup_pointer_type (type), addr);
1036 /* Not a memory address; check what the problem was. */
1037 switch (VALUE_LVAL (val))
1041 struct frame_info *frame;
1042 const char *regname;
1044 frame = frame_find_by_id (VALUE_FRAME_ID (val));
1047 regname = gdbarch_register_name (get_frame_arch (frame),
1048 VALUE_REGNUM (val));
1049 gdb_assert (regname && *regname);
1051 error (_("Address requested for identifier "
1052 "\"%s\" which is in register $%s"),
1053 SYMBOL_PRINT_NAME (var), regname);
1058 error (_("Can't take address of \"%s\" which isn't an lvalue."),
1059 SYMBOL_PRINT_NAME (var));
1066 /* Return one if VAL does not live in target memory, but should in order
1067 to operate on it. Otherwise return zero. */
1070 value_must_coerce_to_target (struct value *val)
1072 struct type *valtype;
1074 /* The only lval kinds which do not live in target memory. */
1075 if (VALUE_LVAL (val) != not_lval
1076 && VALUE_LVAL (val) != lval_internalvar)
1079 valtype = check_typedef (value_type (val));
1081 switch (TYPE_CODE (valtype))
1083 case TYPE_CODE_ARRAY:
1084 case TYPE_CODE_STRING:
1091 /* Make sure that VAL lives in target memory if it's supposed to. For instance,
1092 strings are constructed as character arrays in GDB's storage, and this
1093 function copies them to the target. */
1096 value_coerce_to_target (struct value *val)
1101 if (!value_must_coerce_to_target (val))
1104 length = TYPE_LENGTH (check_typedef (value_type (val)));
1105 addr = allocate_space_in_inferior (length);
1106 write_memory (addr, value_contents (val), length);
1107 return value_at_lazy (value_type (val), addr);
1110 /* Given a value which is an array, return a value which is a pointer
1111 to its first element, regardless of whether or not the array has a
1112 nonzero lower bound.
1114 FIXME: A previous comment here indicated that this routine should
1115 be substracting the array's lower bound. It's not clear to me that
1116 this is correct. Given an array subscripting operation, it would
1117 certainly work to do the adjustment here, essentially computing:
1119 (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0])
1121 However I believe a more appropriate and logical place to account
1122 for the lower bound is to do so in value_subscript, essentially
1125 (&array[0] + ((index - lowerbound) * sizeof array[0]))
1127 As further evidence consider what would happen with operations
1128 other than array subscripting, where the caller would get back a
1129 value that had an address somewhere before the actual first element
1130 of the array, and the information about the lower bound would be
1131 lost because of the coercion to pointer type.
1135 value_coerce_array (struct value *arg1)
1137 struct type *type = check_typedef (value_type (arg1));
1139 /* If the user tries to do something requiring a pointer with an
1140 array that has not yet been pushed to the target, then this would
1141 be a good time to do so. */
1142 arg1 = value_coerce_to_target (arg1);
1144 if (VALUE_LVAL (arg1) != lval_memory)
1145 error (_("Attempt to take address of value not located in memory."));
1147 return value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
1148 (VALUE_ADDRESS (arg1) + value_offset (arg1)));
1151 /* Given a value which is a function, return a value which is a pointer
1155 value_coerce_function (struct value *arg1)
1157 struct value *retval;
1159 if (VALUE_LVAL (arg1) != lval_memory)
1160 error (_("Attempt to take address of value not located in memory."));
1162 retval = value_from_pointer (lookup_pointer_type (value_type (arg1)),
1163 (VALUE_ADDRESS (arg1) + value_offset (arg1)));
1167 /* Return a pointer value for the object for which ARG1 is the
1171 value_addr (struct value *arg1)
1175 struct type *type = check_typedef (value_type (arg1));
1176 if (TYPE_CODE (type) == TYPE_CODE_REF)
1178 /* Copy the value, but change the type from (T&) to (T*). We
1179 keep the same location information, which is efficient, and
1180 allows &(&X) to get the location containing the reference. */
1181 arg2 = value_copy (arg1);
1182 deprecated_set_value_type (arg2,
1183 lookup_pointer_type (TYPE_TARGET_TYPE (type)));
1186 if (TYPE_CODE (type) == TYPE_CODE_FUNC)
1187 return value_coerce_function (arg1);
1189 /* If this is an array that has not yet been pushed to the target,
1190 then this would be a good time to force it to memory. */
1191 arg1 = value_coerce_to_target (arg1);
1193 if (VALUE_LVAL (arg1) != lval_memory)
1194 error (_("Attempt to take address of value not located in memory."));
1196 /* Get target memory address */
1197 arg2 = value_from_pointer (lookup_pointer_type (value_type (arg1)),
1198 (VALUE_ADDRESS (arg1)
1199 + value_offset (arg1)
1200 + value_embedded_offset (arg1)));
1202 /* This may be a pointer to a base subobject; so remember the
1203 full derived object's type ... */
1204 arg2 = value_change_enclosing_type (arg2, lookup_pointer_type (value_enclosing_type (arg1)));
1205 /* ... and also the relative position of the subobject in the full
1207 set_value_pointed_to_offset (arg2, value_embedded_offset (arg1));
1211 /* Return a reference value for the object for which ARG1 is the
1215 value_ref (struct value *arg1)
1219 struct type *type = check_typedef (value_type (arg1));
1220 if (TYPE_CODE (type) == TYPE_CODE_REF)
1223 arg2 = value_addr (arg1);
1224 deprecated_set_value_type (arg2, lookup_reference_type (type));
1228 /* Given a value of a pointer type, apply the C unary * operator to
1232 value_ind (struct value *arg1)
1234 struct type *base_type;
1237 arg1 = coerce_array (arg1);
1239 base_type = check_typedef (value_type (arg1));
1241 if (TYPE_CODE (base_type) == TYPE_CODE_PTR)
1243 struct type *enc_type;
1244 /* We may be pointing to something embedded in a larger object.
1245 Get the real type of the enclosing object. */
1246 enc_type = check_typedef (value_enclosing_type (arg1));
1247 enc_type = TYPE_TARGET_TYPE (enc_type);
1249 if (TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_FUNC
1250 || TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_METHOD)
1251 /* For functions, go through find_function_addr, which knows
1252 how to handle function descriptors. */
1253 arg2 = value_at_lazy (enc_type,
1254 find_function_addr (arg1, NULL));
1256 /* Retrieve the enclosing object pointed to */
1257 arg2 = value_at_lazy (enc_type,
1258 (value_as_address (arg1)
1259 - value_pointed_to_offset (arg1)));
1261 /* Re-adjust type. */
1262 deprecated_set_value_type (arg2, TYPE_TARGET_TYPE (base_type));
1263 /* Add embedding info. */
1264 arg2 = value_change_enclosing_type (arg2, enc_type);
1265 set_value_embedded_offset (arg2, value_pointed_to_offset (arg1));
1267 /* We may be pointing to an object of some derived type. */
1268 arg2 = value_full_object (arg2, NULL, 0, 0, 0);
1272 error (_("Attempt to take contents of a non-pointer value."));
1273 return 0; /* For lint -- never reached. */
1276 /* Create a value for an array by allocating space in GDB, copying
1277 copying the data into that space, and then setting up an array
1280 The array bounds are set from LOWBOUND and HIGHBOUND, and the array
1281 is populated from the values passed in ELEMVEC.
1283 The element type of the array is inherited from the type of the
1284 first element, and all elements must have the same size (though we
1285 don't currently enforce any restriction on their types). */
1288 value_array (int lowbound, int highbound, struct value **elemvec)
1292 unsigned int typelength;
1294 struct type *rangetype;
1295 struct type *arraytype;
1298 /* Validate that the bounds are reasonable and that each of the
1299 elements have the same size. */
1301 nelem = highbound - lowbound + 1;
1304 error (_("bad array bounds (%d, %d)"), lowbound, highbound);
1306 typelength = TYPE_LENGTH (value_enclosing_type (elemvec[0]));
1307 for (idx = 1; idx < nelem; idx++)
1309 if (TYPE_LENGTH (value_enclosing_type (elemvec[idx])) != typelength)
1311 error (_("array elements must all be the same size"));
1315 rangetype = create_range_type ((struct type *) NULL,
1317 lowbound, highbound);
1318 arraytype = create_array_type ((struct type *) NULL,
1319 value_enclosing_type (elemvec[0]),
1322 if (!current_language->c_style_arrays)
1324 val = allocate_value (arraytype);
1325 for (idx = 0; idx < nelem; idx++)
1327 memcpy (value_contents_all_raw (val) + (idx * typelength),
1328 value_contents_all (elemvec[idx]),
1334 /* Allocate space to store the array, and then initialize it by
1335 copying in each element. */
1337 val = allocate_value (arraytype);
1338 for (idx = 0; idx < nelem; idx++)
1339 memcpy (value_contents_writeable (val) + (idx * typelength),
1340 value_contents_all (elemvec[idx]),
1345 /* Create a value for a string constant by allocating space in the
1346 inferior, copying the data into that space, and returning the
1347 address with type TYPE_CODE_STRING. PTR points to the string
1348 constant data; LEN is number of characters.
1350 Note that string types are like array of char types with a lower
1351 bound of zero and an upper bound of LEN - 1. Also note that the
1352 string may contain embedded null bytes. */
1355 value_string (char *ptr, int len)
1358 int lowbound = current_language->string_lower_bound;
1359 struct type *rangetype = create_range_type ((struct type *) NULL,
1362 len + lowbound - 1);
1363 struct type *stringtype
1364 = create_string_type ((struct type *) NULL, rangetype);
1367 if (current_language->c_style_arrays == 0)
1369 val = allocate_value (stringtype);
1370 memcpy (value_contents_raw (val), ptr, len);
1375 /* Allocate space to store the string in the inferior, and then copy
1376 LEN bytes from PTR in gdb to that address in the inferior. */
1378 addr = allocate_space_in_inferior (len);
1379 write_memory (addr, (gdb_byte *) ptr, len);
1381 val = value_at_lazy (stringtype, addr);
1386 value_bitstring (char *ptr, int len)
1389 struct type *domain_type = create_range_type (NULL,
1392 struct type *type = create_set_type ((struct type *) NULL,
1394 TYPE_CODE (type) = TYPE_CODE_BITSTRING;
1395 val = allocate_value (type);
1396 memcpy (value_contents_raw (val), ptr, TYPE_LENGTH (type));
1400 /* See if we can pass arguments in T2 to a function which takes
1401 arguments of types T1. T1 is a list of NARGS arguments, and T2 is
1402 a NULL-terminated vector. If some arguments need coercion of some
1403 sort, then the coerced values are written into T2. Return value is
1404 0 if the arguments could be matched, or the position at which they
1407 STATICP is nonzero if the T1 argument list came from a static
1408 member function. T2 will still include the ``this'' pointer, but
1411 For non-static member functions, we ignore the first argument,
1412 which is the type of the instance variable. This is because we
1413 want to handle calls with objects from derived classes. This is
1414 not entirely correct: we should actually check to make sure that a
1415 requested operation is type secure, shouldn't we? FIXME. */
1418 typecmp (int staticp, int varargs, int nargs,
1419 struct field t1[], struct value *t2[])
1424 internal_error (__FILE__, __LINE__,
1425 _("typecmp: no argument list"));
1427 /* Skip ``this'' argument if applicable. T2 will always include
1433 (i < nargs) && TYPE_CODE (t1[i].type) != TYPE_CODE_VOID;
1436 struct type *tt1, *tt2;
1441 tt1 = check_typedef (t1[i].type);
1442 tt2 = check_typedef (value_type (t2[i]));
1444 if (TYPE_CODE (tt1) == TYPE_CODE_REF
1445 /* We should be doing hairy argument matching, as below. */
1446 && (TYPE_CODE (check_typedef (TYPE_TARGET_TYPE (tt1))) == TYPE_CODE (tt2)))
1448 if (TYPE_CODE (tt2) == TYPE_CODE_ARRAY)
1449 t2[i] = value_coerce_array (t2[i]);
1451 t2[i] = value_ref (t2[i]);
1455 /* djb - 20000715 - Until the new type structure is in the
1456 place, and we can attempt things like implicit conversions,
1457 we need to do this so you can take something like a map<const
1458 char *>, and properly access map["hello"], because the
1459 argument to [] will be a reference to a pointer to a char,
1460 and the argument will be a pointer to a char. */
1461 while (TYPE_CODE(tt1) == TYPE_CODE_REF
1462 || TYPE_CODE (tt1) == TYPE_CODE_PTR)
1464 tt1 = check_typedef( TYPE_TARGET_TYPE(tt1) );
1466 while (TYPE_CODE(tt2) == TYPE_CODE_ARRAY
1467 || TYPE_CODE(tt2) == TYPE_CODE_PTR
1468 || TYPE_CODE(tt2) == TYPE_CODE_REF)
1470 tt2 = check_typedef (TYPE_TARGET_TYPE(tt2));
1472 if (TYPE_CODE (tt1) == TYPE_CODE (tt2))
1474 /* Array to pointer is a `trivial conversion' according to the
1477 /* We should be doing much hairier argument matching (see
1478 section 13.2 of the ARM), but as a quick kludge, just check
1479 for the same type code. */
1480 if (TYPE_CODE (t1[i].type) != TYPE_CODE (value_type (t2[i])))
1483 if (varargs || t2[i] == NULL)
1488 /* Helper function used by value_struct_elt to recurse through
1489 baseclasses. Look for a field NAME in ARG1. Adjust the address of
1490 ARG1 by OFFSET bytes, and search in it assuming it has (class) type
1491 TYPE. If found, return value, else return NULL.
1493 If LOOKING_FOR_BASECLASS, then instead of looking for struct
1494 fields, look for a baseclass named NAME. */
1496 static struct value *
1497 search_struct_field (char *name, struct value *arg1, int offset,
1498 struct type *type, int looking_for_baseclass)
1501 int nbases = TYPE_N_BASECLASSES (type);
1503 CHECK_TYPEDEF (type);
1505 if (!looking_for_baseclass)
1506 for (i = TYPE_NFIELDS (type) - 1; i >= nbases; i--)
1508 char *t_field_name = TYPE_FIELD_NAME (type, i);
1510 if (t_field_name && (strcmp_iw (t_field_name, name) == 0))
1513 if (field_is_static (&TYPE_FIELD (type, i)))
1515 v = value_static_field (type, i);
1517 error (_("field %s is nonexistent or has been optimised out"),
1522 v = value_primitive_field (arg1, offset, i, type);
1524 error (_("there is no field named %s"), name);
1530 && (t_field_name[0] == '\0'
1531 || (TYPE_CODE (type) == TYPE_CODE_UNION
1532 && (strcmp_iw (t_field_name, "else") == 0))))
1534 struct type *field_type = TYPE_FIELD_TYPE (type, i);
1535 if (TYPE_CODE (field_type) == TYPE_CODE_UNION
1536 || TYPE_CODE (field_type) == TYPE_CODE_STRUCT)
1538 /* Look for a match through the fields of an anonymous
1539 union, or anonymous struct. C++ provides anonymous
1542 In the GNU Chill (now deleted from GDB)
1543 implementation of variant record types, each
1544 <alternative field> has an (anonymous) union type,
1545 each member of the union represents a <variant
1546 alternative>. Each <variant alternative> is
1547 represented as a struct, with a member for each
1551 int new_offset = offset;
1553 /* This is pretty gross. In G++, the offset in an
1554 anonymous union is relative to the beginning of the
1555 enclosing struct. In the GNU Chill (now deleted
1556 from GDB) implementation of variant records, the
1557 bitpos is zero in an anonymous union field, so we
1558 have to add the offset of the union here. */
1559 if (TYPE_CODE (field_type) == TYPE_CODE_STRUCT
1560 || (TYPE_NFIELDS (field_type) > 0
1561 && TYPE_FIELD_BITPOS (field_type, 0) == 0))
1562 new_offset += TYPE_FIELD_BITPOS (type, i) / 8;
1564 v = search_struct_field (name, arg1, new_offset,
1566 looking_for_baseclass);
1573 for (i = 0; i < nbases; i++)
1576 struct type *basetype = check_typedef (TYPE_BASECLASS (type, i));
1577 /* If we are looking for baseclasses, this is what we get when
1578 we hit them. But it could happen that the base part's member
1579 name is not yet filled in. */
1580 int found_baseclass = (looking_for_baseclass
1581 && TYPE_BASECLASS_NAME (type, i) != NULL
1582 && (strcmp_iw (name,
1583 TYPE_BASECLASS_NAME (type,
1586 if (BASETYPE_VIA_VIRTUAL (type, i))
1591 boffset = baseclass_offset (type, i,
1592 value_contents (arg1) + offset,
1593 VALUE_ADDRESS (arg1)
1594 + value_offset (arg1) + offset);
1596 error (_("virtual baseclass botch"));
1598 /* The virtual base class pointer might have been clobbered
1599 by the user program. Make sure that it still points to a
1600 valid memory location. */
1603 if (boffset < 0 || boffset >= TYPE_LENGTH (type))
1605 CORE_ADDR base_addr;
1607 v2 = allocate_value (basetype);
1609 VALUE_ADDRESS (arg1) + value_offset (arg1) + boffset;
1610 if (target_read_memory (base_addr,
1611 value_contents_raw (v2),
1612 TYPE_LENGTH (basetype)) != 0)
1613 error (_("virtual baseclass botch"));
1614 VALUE_LVAL (v2) = lval_memory;
1615 VALUE_ADDRESS (v2) = base_addr;
1619 if (VALUE_LVAL (arg1) == lval_memory && value_lazy (arg1))
1620 v2 = allocate_value_lazy (basetype);
1623 v2 = allocate_value (basetype);
1624 memcpy (value_contents_raw (v2),
1625 value_contents_raw (arg1) + boffset,
1626 TYPE_LENGTH (basetype));
1628 set_value_component_location (v2, arg1);
1629 VALUE_FRAME_ID (v2) = VALUE_FRAME_ID (arg1);
1630 set_value_offset (v2, value_offset (arg1) + boffset);
1633 if (found_baseclass)
1635 v = search_struct_field (name, v2, 0,
1636 TYPE_BASECLASS (type, i),
1637 looking_for_baseclass);
1639 else if (found_baseclass)
1640 v = value_primitive_field (arg1, offset, i, type);
1642 v = search_struct_field (name, arg1,
1643 offset + TYPE_BASECLASS_BITPOS (type,
1645 basetype, looking_for_baseclass);
1652 /* Helper function used by value_struct_elt to recurse through
1653 baseclasses. Look for a field NAME in ARG1. Adjust the address of
1654 ARG1 by OFFSET bytes, and search in it assuming it has (class) type
1657 If found, return value, else if name matched and args not return
1658 (value) -1, else return NULL. */
1660 static struct value *
1661 search_struct_method (char *name, struct value **arg1p,
1662 struct value **args, int offset,
1663 int *static_memfuncp, struct type *type)
1667 int name_matched = 0;
1668 char dem_opname[64];
1670 CHECK_TYPEDEF (type);
1671 for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--)
1673 char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i);
1674 /* FIXME! May need to check for ARM demangling here */
1675 if (strncmp (t_field_name, "__", 2) == 0 ||
1676 strncmp (t_field_name, "op", 2) == 0 ||
1677 strncmp (t_field_name, "type", 4) == 0)
1679 if (cplus_demangle_opname (t_field_name, dem_opname, DMGL_ANSI))
1680 t_field_name = dem_opname;
1681 else if (cplus_demangle_opname (t_field_name, dem_opname, 0))
1682 t_field_name = dem_opname;
1684 if (t_field_name && (strcmp_iw (t_field_name, name) == 0))
1686 int j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1;
1687 struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i);
1690 check_stub_method_group (type, i);
1691 if (j > 0 && args == 0)
1692 error (_("cannot resolve overloaded method `%s': no arguments supplied"), name);
1693 else if (j == 0 && args == 0)
1695 v = value_fn_field (arg1p, f, j, type, offset);
1702 if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j),
1703 TYPE_VARARGS (TYPE_FN_FIELD_TYPE (f, j)),
1704 TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (f, j)),
1705 TYPE_FN_FIELD_ARGS (f, j), args))
1707 if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
1708 return value_virtual_fn_field (arg1p, f, j,
1710 if (TYPE_FN_FIELD_STATIC_P (f, j)
1712 *static_memfuncp = 1;
1713 v = value_fn_field (arg1p, f, j, type, offset);
1722 for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
1726 if (BASETYPE_VIA_VIRTUAL (type, i))
1728 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
1729 const gdb_byte *base_valaddr;
1731 /* The virtual base class pointer might have been
1732 clobbered by the user program. Make sure that it
1733 still points to a valid memory location. */
1735 if (offset < 0 || offset >= TYPE_LENGTH (type))
1737 gdb_byte *tmp = alloca (TYPE_LENGTH (baseclass));
1738 if (target_read_memory (VALUE_ADDRESS (*arg1p)
1739 + value_offset (*arg1p) + offset,
1740 tmp, TYPE_LENGTH (baseclass)) != 0)
1741 error (_("virtual baseclass botch"));
1745 base_valaddr = value_contents (*arg1p) + offset;
1747 base_offset = baseclass_offset (type, i, base_valaddr,
1748 VALUE_ADDRESS (*arg1p)
1749 + value_offset (*arg1p) + offset);
1750 if (base_offset == -1)
1751 error (_("virtual baseclass botch"));
1755 base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8;
1757 v = search_struct_method (name, arg1p, args, base_offset + offset,
1758 static_memfuncp, TYPE_BASECLASS (type, i));
1759 if (v == (struct value *) - 1)
1765 /* FIXME-bothner: Why is this commented out? Why is it here? */
1766 /* *arg1p = arg1_tmp; */
1771 return (struct value *) - 1;
1776 /* Given *ARGP, a value of type (pointer to a)* structure/union,
1777 extract the component named NAME from the ultimate target
1778 structure/union and return it as a value with its appropriate type.
1779 ERR is used in the error message if *ARGP's type is wrong.
1781 C++: ARGS is a list of argument types to aid in the selection of
1782 an appropriate method. Also, handle derived types.
1784 STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location
1785 where the truthvalue of whether the function that was resolved was
1786 a static member function or not is stored.
1788 ERR is an error message to be printed in case the field is not
1792 value_struct_elt (struct value **argp, struct value **args,
1793 char *name, int *static_memfuncp, char *err)
1798 *argp = coerce_array (*argp);
1800 t = check_typedef (value_type (*argp));
1802 /* Follow pointers until we get to a non-pointer. */
1804 while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF)
1806 *argp = value_ind (*argp);
1807 /* Don't coerce fn pointer to fn and then back again! */
1808 if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
1809 *argp = coerce_array (*argp);
1810 t = check_typedef (value_type (*argp));
1813 if (TYPE_CODE (t) != TYPE_CODE_STRUCT
1814 && TYPE_CODE (t) != TYPE_CODE_UNION)
1815 error (_("Attempt to extract a component of a value that is not a %s."), err);
1817 /* Assume it's not, unless we see that it is. */
1818 if (static_memfuncp)
1819 *static_memfuncp = 0;
1823 /* if there are no arguments ...do this... */
1825 /* Try as a field first, because if we succeed, there is less
1827 v = search_struct_field (name, *argp, 0, t, 0);
1831 /* C++: If it was not found as a data field, then try to
1832 return it as a pointer to a method. */
1834 if (destructor_name_p (name, t))
1835 error (_("Cannot get value of destructor"));
1837 v = search_struct_method (name, argp, args, 0,
1838 static_memfuncp, t);
1840 if (v == (struct value *) - 1)
1841 error (_("Cannot take address of method %s."), name);
1844 if (TYPE_NFN_FIELDS (t))
1845 error (_("There is no member or method named %s."), name);
1847 error (_("There is no member named %s."), name);
1852 if (destructor_name_p (name, t))
1856 /* Destructors are a special case. */
1857 int m_index, f_index;
1860 if (get_destructor_fn_field (t, &m_index, &f_index))
1862 v = value_fn_field (NULL,
1863 TYPE_FN_FIELDLIST1 (t, m_index),
1867 error (_("could not find destructor function named %s."),
1874 error (_("destructor should not have any argument"));
1878 v = search_struct_method (name, argp, args, 0,
1879 static_memfuncp, t);
1881 if (v == (struct value *) - 1)
1883 error (_("One of the arguments you tried to pass to %s could not be converted to what the function wants."), name);
1887 /* See if user tried to invoke data as function. If so, hand it
1888 back. If it's not callable (i.e., a pointer to function),
1889 gdb should give an error. */
1890 v = search_struct_field (name, *argp, 0, t, 0);
1891 /* If we found an ordinary field, then it is not a method call.
1892 So, treat it as if it were a static member function. */
1893 if (v && static_memfuncp)
1894 *static_memfuncp = 1;
1898 error (_("Structure has no component named %s."), name);
1902 /* Search through the methods of an object (and its bases) to find a
1903 specified method. Return the pointer to the fn_field list of
1904 overloaded instances.
1906 Helper function for value_find_oload_list.
1907 ARGP is a pointer to a pointer to a value (the object).
1908 METHOD is a string containing the method name.
1909 OFFSET is the offset within the value.
1910 TYPE is the assumed type of the object.
1911 NUM_FNS is the number of overloaded instances.
1912 BASETYPE is set to the actual type of the subobject where the
1914 BOFFSET is the offset of the base subobject where the method is found.
1917 static struct fn_field *
1918 find_method_list (struct value **argp, char *method,
1919 int offset, struct type *type, int *num_fns,
1920 struct type **basetype, int *boffset)
1924 CHECK_TYPEDEF (type);
1928 /* First check in object itself. */
1929 for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--)
1931 /* pai: FIXME What about operators and type conversions? */
1932 char *fn_field_name = TYPE_FN_FIELDLIST_NAME (type, i);
1933 if (fn_field_name && (strcmp_iw (fn_field_name, method) == 0))
1935 int len = TYPE_FN_FIELDLIST_LENGTH (type, i);
1936 struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i);
1942 /* Resolve any stub methods. */
1943 check_stub_method_group (type, i);
1949 /* Not found in object, check in base subobjects. */
1950 for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
1953 if (BASETYPE_VIA_VIRTUAL (type, i))
1955 base_offset = value_offset (*argp) + offset;
1956 base_offset = baseclass_offset (type, i,
1957 value_contents (*argp) + base_offset,
1958 VALUE_ADDRESS (*argp) + base_offset);
1959 if (base_offset == -1)
1960 error (_("virtual baseclass botch"));
1962 else /* Non-virtual base, simply use bit position from debug
1965 base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8;
1967 f = find_method_list (argp, method, base_offset + offset,
1968 TYPE_BASECLASS (type, i), num_fns,
1976 /* Return the list of overloaded methods of a specified name.
1978 ARGP is a pointer to a pointer to a value (the object).
1979 METHOD is the method name.
1980 OFFSET is the offset within the value contents.
1981 NUM_FNS is the number of overloaded instances.
1982 BASETYPE is set to the type of the base subobject that defines the
1984 BOFFSET is the offset of the base subobject which defines the method.
1988 value_find_oload_method_list (struct value **argp, char *method,
1989 int offset, int *num_fns,
1990 struct type **basetype, int *boffset)
1994 t = check_typedef (value_type (*argp));
1996 /* Code snarfed from value_struct_elt. */
1997 while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF)
1999 *argp = value_ind (*argp);
2000 /* Don't coerce fn pointer to fn and then back again! */
2001 if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
2002 *argp = coerce_array (*argp);
2003 t = check_typedef (value_type (*argp));
2006 if (TYPE_CODE (t) != TYPE_CODE_STRUCT
2007 && TYPE_CODE (t) != TYPE_CODE_UNION)
2008 error (_("Attempt to extract a component of a value that is not a struct or union"));
2010 return find_method_list (argp, method, 0, t, num_fns,
2014 /* Given an array of argument types (ARGTYPES) (which includes an
2015 entry for "this" in the case of C++ methods), the number of
2016 arguments NARGS, the NAME of a function whether it's a method or
2017 not (METHOD), and the degree of laxness (LAX) in conforming to
2018 overload resolution rules in ANSI C++, find the best function that
2019 matches on the argument types according to the overload resolution
2022 In the case of class methods, the parameter OBJ is an object value
2023 in which to search for overloaded methods.
2025 In the case of non-method functions, the parameter FSYM is a symbol
2026 corresponding to one of the overloaded functions.
2028 Return value is an integer: 0 -> good match, 10 -> debugger applied
2029 non-standard coercions, 100 -> incompatible.
2031 If a method is being searched for, VALP will hold the value.
2032 If a non-method is being searched for, SYMP will hold the symbol
2035 If a method is being searched for, and it is a static method,
2036 then STATICP will point to a non-zero value.
2038 Note: This function does *not* check the value of
2039 overload_resolution. Caller must check it to see whether overload
2040 resolution is permitted.
2044 find_overload_match (struct type **arg_types, int nargs,
2045 char *name, int method, int lax,
2046 struct value **objp, struct symbol *fsym,
2047 struct value **valp, struct symbol **symp,
2050 struct value *obj = (objp ? *objp : NULL);
2051 /* Index of best overloaded function. */
2053 /* The measure for the current best match. */
2054 struct badness_vector *oload_champ_bv = NULL;
2055 struct value *temp = obj;
2056 /* For methods, the list of overloaded methods. */
2057 struct fn_field *fns_ptr = NULL;
2058 /* For non-methods, the list of overloaded function symbols. */
2059 struct symbol **oload_syms = NULL;
2060 /* Number of overloaded instances being considered. */
2062 struct type *basetype = NULL;
2066 struct cleanup *old_cleanups = NULL;
2068 const char *obj_type_name = NULL;
2069 char *func_name = NULL;
2070 enum oload_classification match_quality;
2072 /* Get the list of overloaded methods or functions. */
2076 obj_type_name = TYPE_NAME (value_type (obj));
2077 /* Hack: evaluate_subexp_standard often passes in a pointer
2078 value rather than the object itself, so try again. */
2079 if ((!obj_type_name || !*obj_type_name)
2080 && (TYPE_CODE (value_type (obj)) == TYPE_CODE_PTR))
2081 obj_type_name = TYPE_NAME (TYPE_TARGET_TYPE (value_type (obj)));
2083 fns_ptr = value_find_oload_method_list (&temp, name,
2085 &basetype, &boffset);
2086 if (!fns_ptr || !num_fns)
2087 error (_("Couldn't find method %s%s%s"),
2089 (obj_type_name && *obj_type_name) ? "::" : "",
2091 /* If we are dealing with stub method types, they should have
2092 been resolved by find_method_list via
2093 value_find_oload_method_list above. */
2094 gdb_assert (TYPE_DOMAIN_TYPE (fns_ptr[0].type) != NULL);
2095 oload_champ = find_oload_champ (arg_types, nargs, method,
2097 oload_syms, &oload_champ_bv);
2101 const char *qualified_name = SYMBOL_CPLUS_DEMANGLED_NAME (fsym);
2103 /* If we have a C++ name, try to extract just the function
2106 func_name = cp_func_name (qualified_name);
2108 /* If there was no C++ name, this must be a C-style function.
2109 Just return the same symbol. Do the same if cp_func_name
2110 fails for some reason. */
2111 if (func_name == NULL)
2117 old_cleanups = make_cleanup (xfree, func_name);
2118 make_cleanup (xfree, oload_syms);
2119 make_cleanup (xfree, oload_champ_bv);
2121 oload_champ = find_oload_champ_namespace (arg_types, nargs,
2128 /* Check how bad the best match is. */
2131 classify_oload_match (oload_champ_bv, nargs,
2132 oload_method_static (method, fns_ptr,
2135 if (match_quality == INCOMPATIBLE)
2138 error (_("Cannot resolve method %s%s%s to any overloaded instance"),
2140 (obj_type_name && *obj_type_name) ? "::" : "",
2143 error (_("Cannot resolve function %s to any overloaded instance"),
2146 else if (match_quality == NON_STANDARD)
2149 warning (_("Using non-standard conversion to match method %s%s%s to supplied arguments"),
2151 (obj_type_name && *obj_type_name) ? "::" : "",
2154 warning (_("Using non-standard conversion to match function %s to supplied arguments"),
2160 if (staticp != NULL)
2161 *staticp = oload_method_static (method, fns_ptr, oload_champ);
2162 if (TYPE_FN_FIELD_VIRTUAL_P (fns_ptr, oload_champ))
2163 *valp = value_virtual_fn_field (&temp, fns_ptr, oload_champ,
2166 *valp = value_fn_field (&temp, fns_ptr, oload_champ,
2171 *symp = oload_syms[oload_champ];
2176 struct type *temp_type = check_typedef (value_type (temp));
2177 struct type *obj_type = check_typedef (value_type (*objp));
2178 if (TYPE_CODE (temp_type) != TYPE_CODE_PTR
2179 && (TYPE_CODE (obj_type) == TYPE_CODE_PTR
2180 || TYPE_CODE (obj_type) == TYPE_CODE_REF))
2182 temp = value_addr (temp);
2186 if (old_cleanups != NULL)
2187 do_cleanups (old_cleanups);
2189 switch (match_quality)
2195 default: /* STANDARD */
2200 /* Find the best overload match, searching for FUNC_NAME in namespaces
2201 contained in QUALIFIED_NAME until it either finds a good match or
2202 runs out of namespaces. It stores the overloaded functions in
2203 *OLOAD_SYMS, and the badness vector in *OLOAD_CHAMP_BV. The
2204 calling function is responsible for freeing *OLOAD_SYMS and
2208 find_oload_champ_namespace (struct type **arg_types, int nargs,
2209 const char *func_name,
2210 const char *qualified_name,
2211 struct symbol ***oload_syms,
2212 struct badness_vector **oload_champ_bv)
2216 find_oload_champ_namespace_loop (arg_types, nargs,
2219 oload_syms, oload_champ_bv,
2225 /* Helper function for find_oload_champ_namespace; NAMESPACE_LEN is
2226 how deep we've looked for namespaces, and the champ is stored in
2227 OLOAD_CHAMP. The return value is 1 if the champ is a good one, 0
2230 It is the caller's responsibility to free *OLOAD_SYMS and
2234 find_oload_champ_namespace_loop (struct type **arg_types, int nargs,
2235 const char *func_name,
2236 const char *qualified_name,
2238 struct symbol ***oload_syms,
2239 struct badness_vector **oload_champ_bv,
2242 int next_namespace_len = namespace_len;
2243 int searched_deeper = 0;
2245 struct cleanup *old_cleanups;
2246 int new_oload_champ;
2247 struct symbol **new_oload_syms;
2248 struct badness_vector *new_oload_champ_bv;
2249 char *new_namespace;
2251 if (next_namespace_len != 0)
2253 gdb_assert (qualified_name[next_namespace_len] == ':');
2254 next_namespace_len += 2;
2256 next_namespace_len +=
2257 cp_find_first_component (qualified_name + next_namespace_len);
2259 /* Initialize these to values that can safely be xfree'd. */
2261 *oload_champ_bv = NULL;
2263 /* First, see if we have a deeper namespace we can search in.
2264 If we get a good match there, use it. */
2266 if (qualified_name[next_namespace_len] == ':')
2268 searched_deeper = 1;
2270 if (find_oload_champ_namespace_loop (arg_types, nargs,
2271 func_name, qualified_name,
2273 oload_syms, oload_champ_bv,
2280 /* If we reach here, either we're in the deepest namespace or we
2281 didn't find a good match in a deeper namespace. But, in the
2282 latter case, we still have a bad match in a deeper namespace;
2283 note that we might not find any match at all in the current
2284 namespace. (There's always a match in the deepest namespace,
2285 because this overload mechanism only gets called if there's a
2286 function symbol to start off with.) */
2288 old_cleanups = make_cleanup (xfree, *oload_syms);
2289 old_cleanups = make_cleanup (xfree, *oload_champ_bv);
2290 new_namespace = alloca (namespace_len + 1);
2291 strncpy (new_namespace, qualified_name, namespace_len);
2292 new_namespace[namespace_len] = '\0';
2293 new_oload_syms = make_symbol_overload_list (func_name,
2295 while (new_oload_syms[num_fns])
2298 new_oload_champ = find_oload_champ (arg_types, nargs, 0, num_fns,
2299 NULL, new_oload_syms,
2300 &new_oload_champ_bv);
2302 /* Case 1: We found a good match. Free earlier matches (if any),
2303 and return it. Case 2: We didn't find a good match, but we're
2304 not the deepest function. Then go with the bad match that the
2305 deeper function found. Case 3: We found a bad match, and we're
2306 the deepest function. Then return what we found, even though
2307 it's a bad match. */
2309 if (new_oload_champ != -1
2310 && classify_oload_match (new_oload_champ_bv, nargs, 0) == STANDARD)
2312 *oload_syms = new_oload_syms;
2313 *oload_champ = new_oload_champ;
2314 *oload_champ_bv = new_oload_champ_bv;
2315 do_cleanups (old_cleanups);
2318 else if (searched_deeper)
2320 xfree (new_oload_syms);
2321 xfree (new_oload_champ_bv);
2322 discard_cleanups (old_cleanups);
2327 gdb_assert (new_oload_champ != -1);
2328 *oload_syms = new_oload_syms;
2329 *oload_champ = new_oload_champ;
2330 *oload_champ_bv = new_oload_champ_bv;
2331 discard_cleanups (old_cleanups);
2336 /* Look for a function to take NARGS args of types ARG_TYPES. Find
2337 the best match from among the overloaded methods or functions
2338 (depending on METHOD) given by FNS_PTR or OLOAD_SYMS, respectively.
2339 The number of methods/functions in the list is given by NUM_FNS.
2340 Return the index of the best match; store an indication of the
2341 quality of the match in OLOAD_CHAMP_BV.
2343 It is the caller's responsibility to free *OLOAD_CHAMP_BV. */
2346 find_oload_champ (struct type **arg_types, int nargs, int method,
2347 int num_fns, struct fn_field *fns_ptr,
2348 struct symbol **oload_syms,
2349 struct badness_vector **oload_champ_bv)
2352 /* A measure of how good an overloaded instance is. */
2353 struct badness_vector *bv;
2354 /* Index of best overloaded function. */
2355 int oload_champ = -1;
2356 /* Current ambiguity state for overload resolution. */
2357 int oload_ambiguous = 0;
2358 /* 0 => no ambiguity, 1 => two good funcs, 2 => incomparable funcs. */
2360 *oload_champ_bv = NULL;
2362 /* Consider each candidate in turn. */
2363 for (ix = 0; ix < num_fns; ix++)
2366 int static_offset = oload_method_static (method, fns_ptr, ix);
2368 struct type **parm_types;
2372 nparms = TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (fns_ptr, ix));
2376 /* If it's not a method, this is the proper place. */
2377 nparms = TYPE_NFIELDS (SYMBOL_TYPE (oload_syms[ix]));
2380 /* Prepare array of parameter types. */
2381 parm_types = (struct type **)
2382 xmalloc (nparms * (sizeof (struct type *)));
2383 for (jj = 0; jj < nparms; jj++)
2384 parm_types[jj] = (method
2385 ? (TYPE_FN_FIELD_ARGS (fns_ptr, ix)[jj].type)
2386 : TYPE_FIELD_TYPE (SYMBOL_TYPE (oload_syms[ix]),
2389 /* Compare parameter types to supplied argument types. Skip
2390 THIS for static methods. */
2391 bv = rank_function (parm_types, nparms,
2392 arg_types + static_offset,
2393 nargs - static_offset);
2395 if (!*oload_champ_bv)
2397 *oload_champ_bv = bv;
2400 else /* See whether current candidate is better or worse than
2402 switch (compare_badness (bv, *oload_champ_bv))
2404 case 0: /* Top two contenders are equally good. */
2405 oload_ambiguous = 1;
2407 case 1: /* Incomparable top contenders. */
2408 oload_ambiguous = 2;
2410 case 2: /* New champion, record details. */
2411 *oload_champ_bv = bv;
2412 oload_ambiguous = 0;
2423 fprintf_filtered (gdb_stderr,
2424 "Overloaded method instance %s, # of parms %d\n",
2425 fns_ptr[ix].physname, nparms);
2427 fprintf_filtered (gdb_stderr,
2428 "Overloaded function instance %s # of parms %d\n",
2429 SYMBOL_DEMANGLED_NAME (oload_syms[ix]),
2431 for (jj = 0; jj < nargs - static_offset; jj++)
2432 fprintf_filtered (gdb_stderr,
2433 "...Badness @ %d : %d\n",
2435 fprintf_filtered (gdb_stderr,
2436 "Overload resolution champion is %d, ambiguous? %d\n",
2437 oload_champ, oload_ambiguous);
2444 /* Return 1 if we're looking at a static method, 0 if we're looking at
2445 a non-static method or a function that isn't a method. */
2448 oload_method_static (int method, struct fn_field *fns_ptr, int index)
2450 if (method && TYPE_FN_FIELD_STATIC_P (fns_ptr, index))
2456 /* Check how good an overload match OLOAD_CHAMP_BV represents. */
2458 static enum oload_classification
2459 classify_oload_match (struct badness_vector *oload_champ_bv,
2465 for (ix = 1; ix <= nargs - static_offset; ix++)
2467 if (oload_champ_bv->rank[ix] >= 100)
2468 return INCOMPATIBLE; /* Truly mismatched types. */
2469 else if (oload_champ_bv->rank[ix] >= 10)
2470 return NON_STANDARD; /* Non-standard type conversions
2474 return STANDARD; /* Only standard conversions needed. */
2477 /* C++: return 1 is NAME is a legitimate name for the destructor of
2478 type TYPE. If TYPE does not have a destructor, or if NAME is
2479 inappropriate for TYPE, an error is signaled. */
2481 destructor_name_p (const char *name, const struct type *type)
2483 /* Destructors are a special case. */
2487 char *dname = type_name_no_tag (type);
2488 char *cp = strchr (dname, '<');
2491 /* Do not compare the template part for template classes. */
2493 len = strlen (dname);
2496 if (strlen (name + 1) != len || strncmp (dname, name + 1, len) != 0)
2497 error (_("name of destructor must equal name of class"));
2504 /* Given TYPE, a structure/union,
2505 return 1 if the component named NAME from the ultimate target
2506 structure/union is defined, otherwise, return 0. */
2509 check_field (struct type *type, const char *name)
2513 for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--)
2515 char *t_field_name = TYPE_FIELD_NAME (type, i);
2516 if (t_field_name && (strcmp_iw (t_field_name, name) == 0))
2520 /* C++: If it was not found as a data field, then try to return it
2521 as a pointer to a method. */
2523 /* Destructors are a special case. */
2524 if (destructor_name_p (name, type))
2526 int m_index, f_index;
2528 return get_destructor_fn_field (type, &m_index, &f_index);
2531 for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i)
2533 if (strcmp_iw (TYPE_FN_FIELDLIST_NAME (type, i), name) == 0)
2537 for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
2538 if (check_field (TYPE_BASECLASS (type, i), name))
2544 /* C++: Given an aggregate type CURTYPE, and a member name NAME,
2545 return the appropriate member (or the address of the member, if
2546 WANT_ADDRESS). This function is used to resolve user expressions
2547 of the form "DOMAIN::NAME". For more details on what happens, see
2548 the comment before value_struct_elt_for_reference. */
2551 value_aggregate_elt (struct type *curtype,
2552 char *name, int want_address,
2555 switch (TYPE_CODE (curtype))
2557 case TYPE_CODE_STRUCT:
2558 case TYPE_CODE_UNION:
2559 return value_struct_elt_for_reference (curtype, 0, curtype,
2561 want_address, noside);
2562 case TYPE_CODE_NAMESPACE:
2563 return value_namespace_elt (curtype, name,
2564 want_address, noside);
2566 internal_error (__FILE__, __LINE__,
2567 _("non-aggregate type in value_aggregate_elt"));
2571 /* C++: Given an aggregate type CURTYPE, and a member name NAME,
2572 return the address of this member as a "pointer to member" type.
2573 If INTYPE is non-null, then it will be the type of the member we
2574 are looking for. This will help us resolve "pointers to member
2575 functions". This function is used to resolve user expressions of
2576 the form "DOMAIN::NAME". */
2578 static struct value *
2579 value_struct_elt_for_reference (struct type *domain, int offset,
2580 struct type *curtype, char *name,
2581 struct type *intype,
2585 struct type *t = curtype;
2587 struct value *v, *result;
2589 if (TYPE_CODE (t) != TYPE_CODE_STRUCT
2590 && TYPE_CODE (t) != TYPE_CODE_UNION)
2591 error (_("Internal error: non-aggregate type to value_struct_elt_for_reference"));
2593 for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--)
2595 char *t_field_name = TYPE_FIELD_NAME (t, i);
2597 if (t_field_name && strcmp (t_field_name, name) == 0)
2599 if (field_is_static (&TYPE_FIELD (t, i)))
2601 v = value_static_field (t, i);
2603 error (_("static field %s has been optimized out"),
2609 if (TYPE_FIELD_PACKED (t, i))
2610 error (_("pointers to bitfield members not allowed"));
2613 return value_from_longest
2614 (lookup_memberptr_type (TYPE_FIELD_TYPE (t, i), domain),
2615 offset + (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3));
2616 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
2617 return allocate_value (TYPE_FIELD_TYPE (t, i));
2619 error (_("Cannot reference non-static field \"%s\""), name);
2623 /* C++: If it was not found as a data field, then try to return it
2624 as a pointer to a method. */
2626 /* Destructors are a special case. */
2627 if (destructor_name_p (name, t))
2629 error (_("member pointers to destructors not implemented yet"));
2632 /* Perform all necessary dereferencing. */
2633 while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR)
2634 intype = TYPE_TARGET_TYPE (intype);
2636 for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i)
2638 char *t_field_name = TYPE_FN_FIELDLIST_NAME (t, i);
2639 char dem_opname[64];
2641 if (strncmp (t_field_name, "__", 2) == 0
2642 || strncmp (t_field_name, "op", 2) == 0
2643 || strncmp (t_field_name, "type", 4) == 0)
2645 if (cplus_demangle_opname (t_field_name,
2646 dem_opname, DMGL_ANSI))
2647 t_field_name = dem_opname;
2648 else if (cplus_demangle_opname (t_field_name,
2650 t_field_name = dem_opname;
2652 if (t_field_name && strcmp (t_field_name, name) == 0)
2654 int j = TYPE_FN_FIELDLIST_LENGTH (t, i);
2655 struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i);
2657 check_stub_method_group (t, i);
2659 if (intype == 0 && j > 1)
2660 error (_("non-unique member `%s' requires type instantiation"), name);
2664 if (TYPE_FN_FIELD_TYPE (f, j) == intype)
2667 error (_("no member function matches that type instantiation"));
2672 if (TYPE_FN_FIELD_STATIC_P (f, j))
2675 lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
2681 return value_addr (read_var_value (s, 0));
2683 return read_var_value (s, 0);
2686 if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
2690 result = allocate_value
2691 (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j)));
2692 cplus_make_method_ptr (value_type (result),
2693 value_contents_writeable (result),
2694 TYPE_FN_FIELD_VOFFSET (f, j), 1);
2696 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
2697 return allocate_value (TYPE_FN_FIELD_TYPE (f, j));
2699 error (_("Cannot reference virtual member function \"%s\""),
2705 lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
2710 v = read_var_value (s, 0);
2715 result = allocate_value (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j)));
2716 cplus_make_method_ptr (value_type (result),
2717 value_contents_writeable (result),
2718 VALUE_ADDRESS (v), 0);
2724 for (i = TYPE_N_BASECLASSES (t) - 1; i >= 0; i--)
2729 if (BASETYPE_VIA_VIRTUAL (t, i))
2732 base_offset = TYPE_BASECLASS_BITPOS (t, i) / 8;
2733 v = value_struct_elt_for_reference (domain,
2734 offset + base_offset,
2735 TYPE_BASECLASS (t, i),
2737 want_address, noside);
2742 /* As a last chance, pretend that CURTYPE is a namespace, and look
2743 it up that way; this (frequently) works for types nested inside
2746 return value_maybe_namespace_elt (curtype, name,
2747 want_address, noside);
2750 /* C++: Return the member NAME of the namespace given by the type
2753 static struct value *
2754 value_namespace_elt (const struct type *curtype,
2755 char *name, int want_address,
2758 struct value *retval = value_maybe_namespace_elt (curtype, name,
2763 error (_("No symbol \"%s\" in namespace \"%s\"."),
2764 name, TYPE_TAG_NAME (curtype));
2769 /* A helper function used by value_namespace_elt and
2770 value_struct_elt_for_reference. It looks up NAME inside the
2771 context CURTYPE; this works if CURTYPE is a namespace or if CURTYPE
2772 is a class and NAME refers to a type in CURTYPE itself (as opposed
2773 to, say, some base class of CURTYPE). */
2775 static struct value *
2776 value_maybe_namespace_elt (const struct type *curtype,
2777 char *name, int want_address,
2780 const char *namespace_name = TYPE_TAG_NAME (curtype);
2782 struct value *result;
2784 sym = cp_lookup_symbol_namespace (namespace_name, name, NULL,
2785 get_selected_block (0),
2790 else if ((noside == EVAL_AVOID_SIDE_EFFECTS)
2791 && (SYMBOL_CLASS (sym) == LOC_TYPEDEF))
2792 result = allocate_value (SYMBOL_TYPE (sym));
2794 result = value_of_variable (sym, get_selected_block (0));
2796 if (result && want_address)
2797 result = value_addr (result);
2802 /* Given a pointer value V, find the real (RTTI) type of the object it
2805 Other parameters FULL, TOP, USING_ENC as with value_rtti_type()
2806 and refer to the values computed for the object pointed to. */
2809 value_rtti_target_type (struct value *v, int *full,
2810 int *top, int *using_enc)
2812 struct value *target;
2814 target = value_ind (v);
2816 return value_rtti_type (target, full, top, using_enc);
2819 /* Given a value pointed to by ARGP, check its real run-time type, and
2820 if that is different from the enclosing type, create a new value
2821 using the real run-time type as the enclosing type (and of the same
2822 type as ARGP) and return it, with the embedded offset adjusted to
2823 be the correct offset to the enclosed object. RTYPE is the type,
2824 and XFULL, XTOP, and XUSING_ENC are the other parameters, computed
2825 by value_rtti_type(). If these are available, they can be supplied
2826 and a second call to value_rtti_type() is avoided. (Pass RTYPE ==
2827 NULL if they're not available. */
2830 value_full_object (struct value *argp,
2832 int xfull, int xtop,
2835 struct type *real_type;
2839 struct value *new_val;
2846 using_enc = xusing_enc;
2849 real_type = value_rtti_type (argp, &full, &top, &using_enc);
2851 /* If no RTTI data, or if object is already complete, do nothing. */
2852 if (!real_type || real_type == value_enclosing_type (argp))
2855 /* If we have the full object, but for some reason the enclosing
2856 type is wrong, set it. */
2857 /* pai: FIXME -- sounds iffy */
2860 argp = value_change_enclosing_type (argp, real_type);
2864 /* Check if object is in memory */
2865 if (VALUE_LVAL (argp) != lval_memory)
2867 warning (_("Couldn't retrieve complete object of RTTI type %s; object may be in register(s)."),
2868 TYPE_NAME (real_type));
2873 /* All other cases -- retrieve the complete object. */
2874 /* Go back by the computed top_offset from the beginning of the
2875 object, adjusting for the embedded offset of argp if that's what
2876 value_rtti_type used for its computation. */
2877 new_val = value_at_lazy (real_type, VALUE_ADDRESS (argp) - top +
2878 (using_enc ? 0 : value_embedded_offset (argp)));
2879 deprecated_set_value_type (new_val, value_type (argp));
2880 set_value_embedded_offset (new_val, (using_enc
2881 ? top + value_embedded_offset (argp)
2887 /* Return the value of the local variable, if one exists.
2888 Flag COMPLAIN signals an error if the request is made in an
2889 inappropriate context. */
2892 value_of_local (const char *name, int complain)
2894 struct symbol *func, *sym;
2897 struct frame_info *frame;
2900 frame = get_selected_frame (_("no frame selected"));
2903 frame = deprecated_safe_get_selected_frame ();
2908 func = get_frame_function (frame);
2912 error (_("no `%s' in nameless context"), name);
2917 b = SYMBOL_BLOCK_VALUE (func);
2918 if (dict_empty (BLOCK_DICT (b)))
2921 error (_("no args, no `%s'"), name);
2926 /* Calling lookup_block_symbol is necessary to get the LOC_REGISTER
2927 symbol instead of the LOC_ARG one (if both exist). */
2928 sym = lookup_block_symbol (b, name, NULL, VAR_DOMAIN);
2932 error (_("current stack frame does not contain a variable named `%s'"),
2938 ret = read_var_value (sym, frame);
2939 if (ret == 0 && complain)
2940 error (_("`%s' argument unreadable"), name);
2944 /* C++/Objective-C: return the value of the class instance variable,
2945 if one exists. Flag COMPLAIN signals an error if the request is
2946 made in an inappropriate context. */
2949 value_of_this (int complain)
2951 if (!current_language->la_name_of_this)
2953 return value_of_local (current_language->la_name_of_this, complain);
2956 /* Create a slice (sub-string, sub-array) of ARRAY, that is LENGTH
2957 elements long, starting at LOWBOUND. The result has the same lower
2958 bound as the original ARRAY. */
2961 value_slice (struct value *array, int lowbound, int length)
2963 struct type *slice_range_type, *slice_type, *range_type;
2964 LONGEST lowerbound, upperbound;
2965 struct value *slice;
2966 struct type *array_type;
2968 array_type = check_typedef (value_type (array));
2969 if (TYPE_CODE (array_type) != TYPE_CODE_ARRAY
2970 && TYPE_CODE (array_type) != TYPE_CODE_STRING
2971 && TYPE_CODE (array_type) != TYPE_CODE_BITSTRING)
2972 error (_("cannot take slice of non-array"));
2974 range_type = TYPE_INDEX_TYPE (array_type);
2975 if (get_discrete_bounds (range_type, &lowerbound, &upperbound) < 0)
2976 error (_("slice from bad array or bitstring"));
2978 if (lowbound < lowerbound || length < 0
2979 || lowbound + length - 1 > upperbound)
2980 error (_("slice out of range"));
2982 /* FIXME-type-allocation: need a way to free this type when we are
2984 slice_range_type = create_range_type ((struct type *) NULL,
2985 TYPE_TARGET_TYPE (range_type),
2987 lowbound + length - 1);
2988 if (TYPE_CODE (array_type) == TYPE_CODE_BITSTRING)
2992 slice_type = create_set_type ((struct type *) NULL,
2994 TYPE_CODE (slice_type) = TYPE_CODE_BITSTRING;
2995 slice = value_zero (slice_type, not_lval);
2997 for (i = 0; i < length; i++)
2999 int element = value_bit_index (array_type,
3000 value_contents (array),
3003 error (_("internal error accessing bitstring"));
3004 else if (element > 0)
3006 int j = i % TARGET_CHAR_BIT;
3007 if (gdbarch_bits_big_endian (current_gdbarch))
3008 j = TARGET_CHAR_BIT - 1 - j;
3009 value_contents_raw (slice)[i / TARGET_CHAR_BIT] |= (1 << j);
3012 /* We should set the address, bitssize, and bitspos, so the
3013 slice can be used on the LHS, but that may require extensions
3014 to value_assign. For now, just leave as a non_lval.
3019 struct type *element_type = TYPE_TARGET_TYPE (array_type);
3021 (lowbound - lowerbound) * TYPE_LENGTH (check_typedef (element_type));
3023 slice_type = create_array_type ((struct type *) NULL,
3026 TYPE_CODE (slice_type) = TYPE_CODE (array_type);
3028 if (VALUE_LVAL (array) == lval_memory && value_lazy (array))
3029 slice = allocate_value_lazy (slice_type);
3032 slice = allocate_value (slice_type);
3033 memcpy (value_contents_writeable (slice),
3034 value_contents (array) + offset,
3035 TYPE_LENGTH (slice_type));
3038 set_value_component_location (slice, array);
3039 VALUE_FRAME_ID (slice) = VALUE_FRAME_ID (array);
3040 set_value_offset (slice, value_offset (array) + offset);
3045 /* Create a value for a FORTRAN complex number. Currently most of the
3046 time values are coerced to COMPLEX*16 (i.e. a complex number
3047 composed of 2 doubles. This really should be a smarter routine
3048 that figures out precision inteligently as opposed to assuming
3049 doubles. FIXME: fmb */
3052 value_literal_complex (struct value *arg1,
3057 struct type *real_type = TYPE_TARGET_TYPE (type);
3059 val = allocate_value (type);
3060 arg1 = value_cast (real_type, arg1);
3061 arg2 = value_cast (real_type, arg2);
3063 memcpy (value_contents_raw (val),
3064 value_contents (arg1), TYPE_LENGTH (real_type));
3065 memcpy (value_contents_raw (val) + TYPE_LENGTH (real_type),
3066 value_contents (arg2), TYPE_LENGTH (real_type));
3070 /* Cast a value into the appropriate complex data type. */
3072 static struct value *
3073 cast_into_complex (struct type *type, struct value *val)
3075 struct type *real_type = TYPE_TARGET_TYPE (type);
3077 if (TYPE_CODE (value_type (val)) == TYPE_CODE_COMPLEX)
3079 struct type *val_real_type = TYPE_TARGET_TYPE (value_type (val));
3080 struct value *re_val = allocate_value (val_real_type);
3081 struct value *im_val = allocate_value (val_real_type);
3083 memcpy (value_contents_raw (re_val),
3084 value_contents (val), TYPE_LENGTH (val_real_type));
3085 memcpy (value_contents_raw (im_val),
3086 value_contents (val) + TYPE_LENGTH (val_real_type),
3087 TYPE_LENGTH (val_real_type));
3089 return value_literal_complex (re_val, im_val, type);
3091 else if (TYPE_CODE (value_type (val)) == TYPE_CODE_FLT
3092 || TYPE_CODE (value_type (val)) == TYPE_CODE_INT)
3093 return value_literal_complex (val,
3094 value_zero (real_type, not_lval),
3097 error (_("cannot cast non-number to complex"));
3101 _initialize_valops (void)
3103 add_setshow_boolean_cmd ("overload-resolution", class_support,
3104 &overload_resolution, _("\
3105 Set overload resolution in evaluating C++ functions."), _("\
3106 Show overload resolution in evaluating C++ functions."),
3108 show_overload_resolution,
3109 &setlist, &showlist);
3110 overload_resolution = 1;