1 /* Evaluate expressions for GDB.
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008
5 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/>. */
23 #include "gdb_string.h"
27 #include "expression.h"
30 #include "language.h" /* For CAST_IS_CONVERSION */
31 #include "f-lang.h" /* for array bound stuff */
34 #include "objc-lang.h"
36 #include "parser-defs.h"
37 #include "cp-support.h"
39 #include "exceptions.h"
41 #include "user-regs.h"
43 #include "gdb_assert.h"
45 /* This is defined in valops.c */
46 extern int overload_resolution
;
48 /* JYG: lookup rtti type of STRUCTOP_PTR when this is set to continue
49 on with successful lookup for member/method of the rtti type. */
50 extern int objectprint
;
52 /* Prototypes for local functions. */
54 static struct value
*evaluate_subexp_for_sizeof (struct expression
*, int *);
56 static struct value
*evaluate_subexp_for_address (struct expression
*,
59 static struct value
*evaluate_subexp (struct type
*, struct expression
*,
62 static char *get_label (struct expression
*, int *);
64 static struct value
*evaluate_struct_tuple (struct value
*,
65 struct expression
*, int *,
68 static LONGEST
init_array_element (struct value
*, struct value
*,
69 struct expression
*, int *, enum noside
,
73 evaluate_subexp (struct type
*expect_type
, struct expression
*exp
,
74 int *pos
, enum noside noside
)
76 return (*exp
->language_defn
->la_exp_desc
->evaluate_exp
)
77 (expect_type
, exp
, pos
, noside
);
80 /* Parse the string EXP as a C expression, evaluate it,
81 and return the result as a number. */
84 parse_and_eval_address (char *exp
)
86 struct expression
*expr
= parse_expression (exp
);
88 struct cleanup
*old_chain
=
89 make_cleanup (free_current_contents
, &expr
);
91 addr
= value_as_address (evaluate_expression (expr
));
92 do_cleanups (old_chain
);
96 /* Like parse_and_eval_address but takes a pointer to a char * variable
97 and advanced that variable across the characters parsed. */
100 parse_and_eval_address_1 (char **expptr
)
102 struct expression
*expr
= parse_exp_1 (expptr
, (struct block
*) 0, 0);
104 struct cleanup
*old_chain
=
105 make_cleanup (free_current_contents
, &expr
);
107 addr
= value_as_address (evaluate_expression (expr
));
108 do_cleanups (old_chain
);
112 /* Like parse_and_eval_address, but treats the value of the expression
113 as an integer, not an address, returns a LONGEST, not a CORE_ADDR */
115 parse_and_eval_long (char *exp
)
117 struct expression
*expr
= parse_expression (exp
);
119 struct cleanup
*old_chain
=
120 make_cleanup (free_current_contents
, &expr
);
122 retval
= value_as_long (evaluate_expression (expr
));
123 do_cleanups (old_chain
);
128 parse_and_eval (char *exp
)
130 struct expression
*expr
= parse_expression (exp
);
132 struct cleanup
*old_chain
=
133 make_cleanup (free_current_contents
, &expr
);
135 val
= evaluate_expression (expr
);
136 do_cleanups (old_chain
);
140 /* Parse up to a comma (or to a closeparen)
141 in the string EXPP as an expression, evaluate it, and return the value.
142 EXPP is advanced to point to the comma. */
145 parse_to_comma_and_eval (char **expp
)
147 struct expression
*expr
= parse_exp_1 (expp
, (struct block
*) 0, 1);
149 struct cleanup
*old_chain
=
150 make_cleanup (free_current_contents
, &expr
);
152 val
= evaluate_expression (expr
);
153 do_cleanups (old_chain
);
157 /* Evaluate an expression in internal prefix form
158 such as is constructed by parse.y.
160 See expression.h for info on the format of an expression. */
163 evaluate_expression (struct expression
*exp
)
166 return evaluate_subexp (NULL_TYPE
, exp
, &pc
, EVAL_NORMAL
);
169 /* Evaluate an expression, avoiding all memory references
170 and getting a value whose type alone is correct. */
173 evaluate_type (struct expression
*exp
)
176 return evaluate_subexp (NULL_TYPE
, exp
, &pc
, EVAL_AVOID_SIDE_EFFECTS
);
179 /* Evaluate a subexpression, avoiding all memory references and
180 getting a value whose type alone is correct. */
183 evaluate_subexpression_type (struct expression
*exp
, int subexp
)
185 return evaluate_subexp (NULL_TYPE
, exp
, &subexp
, EVAL_AVOID_SIDE_EFFECTS
);
188 /* Extract a field operation from an expression. If the subexpression
189 of EXP starting at *SUBEXP is not a structure dereference
190 operation, return NULL. Otherwise, return the name of the
191 dereferenced field, and advance *SUBEXP to point to the
192 subexpression of the left-hand-side of the dereference. This is
193 used when completing field names. */
196 extract_field_op (struct expression
*exp
, int *subexp
)
200 if (exp
->elts
[*subexp
].opcode
!= STRUCTOP_STRUCT
201 && exp
->elts
[*subexp
].opcode
!= STRUCTOP_PTR
)
203 tem
= longest_to_int (exp
->elts
[*subexp
+ 1].longconst
);
204 result
= &exp
->elts
[*subexp
+ 2].string
;
205 (*subexp
) += 1 + 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
209 /* If the next expression is an OP_LABELED, skips past it,
210 returning the label. Otherwise, does nothing and returns NULL. */
213 get_label (struct expression
*exp
, int *pos
)
215 if (exp
->elts
[*pos
].opcode
== OP_LABELED
)
218 char *name
= &exp
->elts
[pc
+ 2].string
;
219 int tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
220 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
227 /* This function evaluates tuples (in (the deleted) Chill) or
228 brace-initializers (in C/C++) for structure types. */
230 static struct value
*
231 evaluate_struct_tuple (struct value
*struct_val
,
232 struct expression
*exp
,
233 int *pos
, enum noside noside
, int nargs
)
235 struct type
*struct_type
= check_typedef (value_type (struct_val
));
236 struct type
*substruct_type
= struct_type
;
237 struct type
*field_type
;
244 struct value
*val
= NULL
;
249 /* Skip past the labels, and count them. */
250 while (get_label (exp
, pos
) != NULL
)
255 char *label
= get_label (exp
, &pc
);
258 for (fieldno
= 0; fieldno
< TYPE_NFIELDS (struct_type
);
261 char *field_name
= TYPE_FIELD_NAME (struct_type
, fieldno
);
262 if (field_name
!= NULL
&& strcmp (field_name
, label
) == 0)
265 subfieldno
= fieldno
;
266 substruct_type
= struct_type
;
270 for (fieldno
= 0; fieldno
< TYPE_NFIELDS (struct_type
);
273 char *field_name
= TYPE_FIELD_NAME (struct_type
, fieldno
);
274 field_type
= TYPE_FIELD_TYPE (struct_type
, fieldno
);
275 if ((field_name
== 0 || *field_name
== '\0')
276 && TYPE_CODE (field_type
) == TYPE_CODE_UNION
)
279 for (; variantno
< TYPE_NFIELDS (field_type
);
283 = TYPE_FIELD_TYPE (field_type
, variantno
);
284 if (TYPE_CODE (substruct_type
) == TYPE_CODE_STRUCT
)
287 subfieldno
< TYPE_NFIELDS (substruct_type
);
290 if (strcmp(TYPE_FIELD_NAME (substruct_type
,
301 error (_("there is no field named %s"), label
);
307 /* Unlabelled tuple element - go to next field. */
311 if (subfieldno
>= TYPE_NFIELDS (substruct_type
))
314 substruct_type
= struct_type
;
320 /* Skip static fields. */
321 while (fieldno
< TYPE_NFIELDS (struct_type
)
322 && TYPE_FIELD_STATIC_KIND (struct_type
, fieldno
))
324 subfieldno
= fieldno
;
325 if (fieldno
>= TYPE_NFIELDS (struct_type
))
326 error (_("too many initializers"));
327 field_type
= TYPE_FIELD_TYPE (struct_type
, fieldno
);
328 if (TYPE_CODE (field_type
) == TYPE_CODE_UNION
329 && TYPE_FIELD_NAME (struct_type
, fieldno
)[0] == '0')
330 error (_("don't know which variant you want to set"));
334 /* Here, struct_type is the type of the inner struct,
335 while substruct_type is the type of the inner struct.
336 These are the same for normal structures, but a variant struct
337 contains anonymous union fields that contain substruct fields.
338 The value fieldno is the index of the top-level (normal or
339 anonymous union) field in struct_field, while the value
340 subfieldno is the index of the actual real (named inner) field
341 in substruct_type. */
343 field_type
= TYPE_FIELD_TYPE (substruct_type
, subfieldno
);
345 val
= evaluate_subexp (field_type
, exp
, pos
, noside
);
347 /* Now actually set the field in struct_val. */
349 /* Assign val to field fieldno. */
350 if (value_type (val
) != field_type
)
351 val
= value_cast (field_type
, val
);
353 bitsize
= TYPE_FIELD_BITSIZE (substruct_type
, subfieldno
);
354 bitpos
= TYPE_FIELD_BITPOS (struct_type
, fieldno
);
356 bitpos
+= TYPE_FIELD_BITPOS (substruct_type
, subfieldno
);
357 addr
= value_contents_writeable (struct_val
) + bitpos
/ 8;
359 modify_field (addr
, value_as_long (val
),
360 bitpos
% 8, bitsize
);
362 memcpy (addr
, value_contents (val
),
363 TYPE_LENGTH (value_type (val
)));
365 while (--nlabels
> 0);
370 /* Recursive helper function for setting elements of array tuples for
371 (the deleted) Chill. The target is ARRAY (which has bounds
372 LOW_BOUND to HIGH_BOUND); the element value is ELEMENT; EXP, POS
373 and NOSIDE are as usual. Evaluates index expresions and sets the
374 specified element(s) of ARRAY to ELEMENT. Returns last index
378 init_array_element (struct value
*array
, struct value
*element
,
379 struct expression
*exp
, int *pos
,
380 enum noside noside
, LONGEST low_bound
, LONGEST high_bound
)
383 int element_size
= TYPE_LENGTH (value_type (element
));
384 if (exp
->elts
[*pos
].opcode
== BINOP_COMMA
)
387 init_array_element (array
, element
, exp
, pos
, noside
,
388 low_bound
, high_bound
);
389 return init_array_element (array
, element
,
390 exp
, pos
, noside
, low_bound
, high_bound
);
392 else if (exp
->elts
[*pos
].opcode
== BINOP_RANGE
)
396 low
= value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
397 high
= value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
398 if (low
< low_bound
|| high
> high_bound
)
399 error (_("tuple range index out of range"));
400 for (index
= low
; index
<= high
; index
++)
402 memcpy (value_contents_raw (array
)
403 + (index
- low_bound
) * element_size
,
404 value_contents (element
), element_size
);
409 index
= value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
410 if (index
< low_bound
|| index
> high_bound
)
411 error (_("tuple index out of range"));
412 memcpy (value_contents_raw (array
) + (index
- low_bound
) * element_size
,
413 value_contents (element
), element_size
);
419 value_f90_subarray (struct value
*array
,
420 struct expression
*exp
, int *pos
, enum noside noside
)
423 LONGEST low_bound
, high_bound
;
424 struct type
*range
= check_typedef (TYPE_INDEX_TYPE (value_type (array
)));
425 enum f90_range_type range_type
= longest_to_int (exp
->elts
[pc
].longconst
);
429 if (range_type
== LOW_BOUND_DEFAULT
|| range_type
== BOTH_BOUND_DEFAULT
)
430 low_bound
= TYPE_LOW_BOUND (range
);
432 low_bound
= value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
434 if (range_type
== HIGH_BOUND_DEFAULT
|| range_type
== BOTH_BOUND_DEFAULT
)
435 high_bound
= TYPE_HIGH_BOUND (range
);
437 high_bound
= value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
439 return value_slice (array
, low_bound
, high_bound
- low_bound
+ 1);
443 evaluate_subexp_standard (struct type
*expect_type
,
444 struct expression
*exp
, int *pos
,
449 int pc
, pc2
= 0, oldpos
;
450 struct value
*arg1
= NULL
;
451 struct value
*arg2
= NULL
;
455 struct value
**argvec
;
456 int upper
, lower
, retcode
;
460 struct type
**arg_types
;
464 op
= exp
->elts
[pc
].opcode
;
469 tem
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
470 (*pos
) += 4 + BYTES_TO_EXP_ELEM (tem
+ 1);
471 if (noside
== EVAL_SKIP
)
473 arg1
= value_aggregate_elt (exp
->elts
[pc
+ 1].type
,
474 &exp
->elts
[pc
+ 3].string
,
477 error (_("There is no field named %s"), &exp
->elts
[pc
+ 3].string
);
482 return value_from_longest (exp
->elts
[pc
+ 1].type
,
483 exp
->elts
[pc
+ 2].longconst
);
487 return value_from_double (exp
->elts
[pc
+ 1].type
,
488 exp
->elts
[pc
+ 2].doubleconst
);
492 return value_from_decfloat (exp
->elts
[pc
+ 1].type
,
493 exp
->elts
[pc
+ 2].decfloatconst
);
497 if (noside
== EVAL_SKIP
)
500 /* JYG: We used to just return value_zero of the symbol type
501 if we're asked to avoid side effects. Otherwise we return
502 value_of_variable (...). However I'm not sure if
503 value_of_variable () has any side effect.
504 We need a full value object returned here for whatis_exp ()
505 to call evaluate_type () and then pass the full value to
506 value_rtti_target_type () if we are dealing with a pointer
507 or reference to a base class and print object is on. */
510 volatile struct gdb_exception except
;
511 struct value
*ret
= NULL
;
513 TRY_CATCH (except
, RETURN_MASK_ERROR
)
515 ret
= value_of_variable (exp
->elts
[pc
+ 2].symbol
,
516 exp
->elts
[pc
+ 1].block
);
519 if (except
.reason
< 0)
521 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
522 ret
= value_zero (SYMBOL_TYPE (exp
->elts
[pc
+ 2].symbol
), not_lval
);
524 throw_exception (except
);
533 access_value_history (longest_to_int (exp
->elts
[pc
+ 1].longconst
));
537 const char *name
= &exp
->elts
[pc
+ 2].string
;
541 (*pos
) += 3 + BYTES_TO_EXP_ELEM (exp
->elts
[pc
+ 1].longconst
+ 1);
542 regno
= user_reg_map_name_to_regnum (current_gdbarch
,
543 name
, strlen (name
));
545 error (_("Register $%s not available."), name
);
547 /* In EVAL_AVOID_SIDE_EFFECTS mode, we only need to return
548 a value with the appropriate register type. Unfortunately,
549 we don't have easy access to the type of user registers.
550 So for these registers, we fetch the register value regardless
551 of the evaluation mode. */
552 if (noside
== EVAL_AVOID_SIDE_EFFECTS
553 && regno
< gdbarch_num_regs (current_gdbarch
)
554 + gdbarch_num_pseudo_regs (current_gdbarch
))
555 val
= value_zero (register_type (current_gdbarch
, regno
), not_lval
);
557 val
= value_of_register (regno
, get_selected_frame (NULL
));
559 error (_("Value of register %s not available."), name
);
565 return value_from_longest (LA_BOOL_TYPE
,
566 exp
->elts
[pc
+ 1].longconst
);
570 return value_of_internalvar (exp
->elts
[pc
+ 1].internalvar
);
573 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
574 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
575 if (noside
== EVAL_SKIP
)
577 return value_string (&exp
->elts
[pc
+ 2].string
, tem
);
579 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class NSString constant. */
580 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
581 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
582 if (noside
== EVAL_SKIP
)
586 return (struct value
*) value_nsstring (&exp
->elts
[pc
+ 2].string
, tem
+ 1);
589 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
591 += 3 + BYTES_TO_EXP_ELEM ((tem
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
);
592 if (noside
== EVAL_SKIP
)
594 return value_bitstring (&exp
->elts
[pc
+ 2].string
, tem
);
599 tem2
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
600 tem3
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
601 nargs
= tem3
- tem2
+ 1;
602 type
= expect_type
? check_typedef (expect_type
) : NULL_TYPE
;
604 if (expect_type
!= NULL_TYPE
&& noside
!= EVAL_SKIP
605 && TYPE_CODE (type
) == TYPE_CODE_STRUCT
)
607 struct value
*rec
= allocate_value (expect_type
);
608 memset (value_contents_raw (rec
), '\0', TYPE_LENGTH (type
));
609 return evaluate_struct_tuple (rec
, exp
, pos
, noside
, nargs
);
612 if (expect_type
!= NULL_TYPE
&& noside
!= EVAL_SKIP
613 && TYPE_CODE (type
) == TYPE_CODE_ARRAY
)
615 struct type
*range_type
= TYPE_FIELD_TYPE (type
, 0);
616 struct type
*element_type
= TYPE_TARGET_TYPE (type
);
617 struct value
*array
= allocate_value (expect_type
);
618 int element_size
= TYPE_LENGTH (check_typedef (element_type
));
619 LONGEST low_bound
, high_bound
, index
;
620 if (get_discrete_bounds (range_type
, &low_bound
, &high_bound
) < 0)
623 high_bound
= (TYPE_LENGTH (type
) / element_size
) - 1;
626 memset (value_contents_raw (array
), 0, TYPE_LENGTH (expect_type
));
627 for (tem
= nargs
; --nargs
>= 0;)
629 struct value
*element
;
631 if (exp
->elts
[*pos
].opcode
== BINOP_RANGE
)
634 evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_SKIP
);
636 element
= evaluate_subexp (element_type
, exp
, pos
, noside
);
637 if (value_type (element
) != element_type
)
638 element
= value_cast (element_type
, element
);
641 int continue_pc
= *pos
;
643 index
= init_array_element (array
, element
, exp
, pos
, noside
,
644 low_bound
, high_bound
);
649 if (index
> high_bound
)
650 /* to avoid memory corruption */
651 error (_("Too many array elements"));
652 memcpy (value_contents_raw (array
)
653 + (index
- low_bound
) * element_size
,
654 value_contents (element
),
662 if (expect_type
!= NULL_TYPE
&& noside
!= EVAL_SKIP
663 && TYPE_CODE (type
) == TYPE_CODE_SET
)
665 struct value
*set
= allocate_value (expect_type
);
666 gdb_byte
*valaddr
= value_contents_raw (set
);
667 struct type
*element_type
= TYPE_INDEX_TYPE (type
);
668 struct type
*check_type
= element_type
;
669 LONGEST low_bound
, high_bound
;
671 /* get targettype of elementtype */
672 while (TYPE_CODE (check_type
) == TYPE_CODE_RANGE
||
673 TYPE_CODE (check_type
) == TYPE_CODE_TYPEDEF
)
674 check_type
= TYPE_TARGET_TYPE (check_type
);
676 if (get_discrete_bounds (element_type
, &low_bound
, &high_bound
) < 0)
677 error (_("(power)set type with unknown size"));
678 memset (valaddr
, '\0', TYPE_LENGTH (type
));
679 for (tem
= 0; tem
< nargs
; tem
++)
681 LONGEST range_low
, range_high
;
682 struct type
*range_low_type
, *range_high_type
;
683 struct value
*elem_val
;
684 if (exp
->elts
[*pos
].opcode
== BINOP_RANGE
)
687 elem_val
= evaluate_subexp (element_type
, exp
, pos
, noside
);
688 range_low_type
= value_type (elem_val
);
689 range_low
= value_as_long (elem_val
);
690 elem_val
= evaluate_subexp (element_type
, exp
, pos
, noside
);
691 range_high_type
= value_type (elem_val
);
692 range_high
= value_as_long (elem_val
);
696 elem_val
= evaluate_subexp (element_type
, exp
, pos
, noside
);
697 range_low_type
= range_high_type
= value_type (elem_val
);
698 range_low
= range_high
= value_as_long (elem_val
);
700 /* check types of elements to avoid mixture of elements from
701 different types. Also check if type of element is "compatible"
702 with element type of powerset */
703 if (TYPE_CODE (range_low_type
) == TYPE_CODE_RANGE
)
704 range_low_type
= TYPE_TARGET_TYPE (range_low_type
);
705 if (TYPE_CODE (range_high_type
) == TYPE_CODE_RANGE
)
706 range_high_type
= TYPE_TARGET_TYPE (range_high_type
);
707 if ((TYPE_CODE (range_low_type
) != TYPE_CODE (range_high_type
)) ||
708 (TYPE_CODE (range_low_type
) == TYPE_CODE_ENUM
&&
709 (range_low_type
!= range_high_type
)))
710 /* different element modes */
711 error (_("POWERSET tuple elements of different mode"));
712 if ((TYPE_CODE (check_type
) != TYPE_CODE (range_low_type
)) ||
713 (TYPE_CODE (check_type
) == TYPE_CODE_ENUM
&&
714 range_low_type
!= check_type
))
715 error (_("incompatible POWERSET tuple elements"));
716 if (range_low
> range_high
)
718 warning (_("empty POWERSET tuple range"));
721 if (range_low
< low_bound
|| range_high
> high_bound
)
722 error (_("POWERSET tuple element out of range"));
723 range_low
-= low_bound
;
724 range_high
-= low_bound
;
725 for (; range_low
<= range_high
; range_low
++)
727 int bit_index
= (unsigned) range_low
% TARGET_CHAR_BIT
;
728 if (gdbarch_bits_big_endian (current_gdbarch
))
729 bit_index
= TARGET_CHAR_BIT
- 1 - bit_index
;
730 valaddr
[(unsigned) range_low
/ TARGET_CHAR_BIT
]
737 argvec
= (struct value
**) alloca (sizeof (struct value
*) * nargs
);
738 for (tem
= 0; tem
< nargs
; tem
++)
740 /* Ensure that array expressions are coerced into pointer objects. */
741 argvec
[tem
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
743 if (noside
== EVAL_SKIP
)
745 return value_array (tem2
, tem3
, argvec
);
749 struct value
*array
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
751 = value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
753 = value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
754 if (noside
== EVAL_SKIP
)
756 return value_slice (array
, lowbound
, upper
- lowbound
+ 1);
759 case TERNOP_SLICE_COUNT
:
761 struct value
*array
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
763 = value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
765 = value_as_long (evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
766 return value_slice (array
, lowbound
, length
);
770 /* Skip third and second args to evaluate the first one. */
771 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
772 if (value_logical_not (arg1
))
774 evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_SKIP
);
775 return evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
779 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
780 evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_SKIP
);
784 case OP_OBJC_SELECTOR
:
785 { /* Objective C @selector operator. */
786 char *sel
= &exp
->elts
[pc
+ 2].string
;
787 int len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
789 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
790 if (noside
== EVAL_SKIP
)
794 sel
[len
] = 0; /* Make sure it's terminated. */
795 return value_from_longest (lookup_pointer_type (builtin_type_void
),
796 lookup_child_selector (sel
));
799 case OP_OBJC_MSGCALL
:
800 { /* Objective C message (method) call. */
802 static CORE_ADDR responds_selector
= 0;
803 static CORE_ADDR method_selector
= 0;
805 CORE_ADDR selector
= 0;
807 int struct_return
= 0;
810 static struct value
*msg_send
= NULL
;
811 static struct value
*msg_send_stret
= NULL
;
812 static int gnu_runtime
= 0;
814 struct value
*target
= NULL
;
815 struct value
*method
= NULL
;
816 struct value
*called_method
= NULL
;
818 struct type
*selector_type
= NULL
;
820 struct value
*ret
= NULL
;
823 selector
= exp
->elts
[pc
+ 1].longconst
;
824 nargs
= exp
->elts
[pc
+ 2].longconst
;
825 argvec
= (struct value
**) alloca (sizeof (struct value
*)
830 selector_type
= lookup_pointer_type (builtin_type_void
);
831 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
832 sub_no_side
= EVAL_NORMAL
;
834 sub_no_side
= noside
;
836 target
= evaluate_subexp (selector_type
, exp
, pos
, sub_no_side
);
838 if (value_as_long (target
) == 0)
839 return value_from_longest (builtin_type_long
, 0);
841 if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0))
844 /* Find the method dispatch (Apple runtime) or method lookup
845 (GNU runtime) function for Objective-C. These will be used
846 to lookup the symbol information for the method. If we
847 can't find any symbol information, then we'll use these to
848 call the method, otherwise we can call the method
849 directly. The msg_send_stret function is used in the special
850 case of a method that returns a structure (Apple runtime
855 type
= lookup_pointer_type (builtin_type_void
);
856 type
= lookup_function_type (type
);
857 type
= lookup_pointer_type (type
);
858 type
= lookup_function_type (type
);
859 type
= lookup_pointer_type (type
);
861 msg_send
= find_function_in_inferior ("objc_msg_lookup");
862 msg_send_stret
= find_function_in_inferior ("objc_msg_lookup");
864 msg_send
= value_from_pointer (type
, value_as_address (msg_send
));
865 msg_send_stret
= value_from_pointer (type
,
866 value_as_address (msg_send_stret
));
870 msg_send
= find_function_in_inferior ("objc_msgSend");
871 /* Special dispatcher for methods returning structs */
872 msg_send_stret
= find_function_in_inferior ("objc_msgSend_stret");
875 /* Verify the target object responds to this method. The
876 standard top-level 'Object' class uses a different name for
877 the verification method than the non-standard, but more
878 often used, 'NSObject' class. Make sure we check for both. */
880 responds_selector
= lookup_child_selector ("respondsToSelector:");
881 if (responds_selector
== 0)
882 responds_selector
= lookup_child_selector ("respondsTo:");
884 if (responds_selector
== 0)
885 error (_("no 'respondsTo:' or 'respondsToSelector:' method"));
887 method_selector
= lookup_child_selector ("methodForSelector:");
888 if (method_selector
== 0)
889 method_selector
= lookup_child_selector ("methodFor:");
891 if (method_selector
== 0)
892 error (_("no 'methodFor:' or 'methodForSelector:' method"));
894 /* Call the verification method, to make sure that the target
895 class implements the desired method. */
897 argvec
[0] = msg_send
;
899 argvec
[2] = value_from_longest (builtin_type_long
, responds_selector
);
900 argvec
[3] = value_from_longest (builtin_type_long
, selector
);
903 ret
= call_function_by_hand (argvec
[0], 3, argvec
+ 1);
906 /* Function objc_msg_lookup returns a pointer. */
908 ret
= call_function_by_hand (argvec
[0], 3, argvec
+ 1);
910 if (value_as_long (ret
) == 0)
911 error (_("Target does not respond to this message selector."));
913 /* Call "methodForSelector:" method, to get the address of a
914 function method that implements this selector for this
915 class. If we can find a symbol at that address, then we
916 know the return type, parameter types etc. (that's a good
919 argvec
[0] = msg_send
;
921 argvec
[2] = value_from_longest (builtin_type_long
, method_selector
);
922 argvec
[3] = value_from_longest (builtin_type_long
, selector
);
925 ret
= call_function_by_hand (argvec
[0], 3, argvec
+ 1);
929 ret
= call_function_by_hand (argvec
[0], 3, argvec
+ 1);
932 /* ret should now be the selector. */
934 addr
= value_as_long (ret
);
937 struct symbol
*sym
= NULL
;
938 /* Is it a high_level symbol? */
940 sym
= find_pc_function (addr
);
942 method
= value_of_variable (sym
, 0);
945 /* If we found a method with symbol information, check to see
946 if it returns a struct. Otherwise assume it doesn't. */
952 struct type
*val_type
;
954 funaddr
= find_function_addr (method
, &val_type
);
956 b
= block_for_pc (funaddr
);
958 CHECK_TYPEDEF (val_type
);
960 if ((val_type
== NULL
)
961 || (TYPE_CODE(val_type
) == TYPE_CODE_ERROR
))
963 if (expect_type
!= NULL
)
964 val_type
= expect_type
;
967 struct_return
= using_struct_return (value_type (method
), val_type
);
969 else if (expect_type
!= NULL
)
971 struct_return
= using_struct_return (NULL
,
972 check_typedef (expect_type
));
975 /* Found a function symbol. Now we will substitute its
976 value in place of the message dispatcher (obj_msgSend),
977 so that we call the method directly instead of thru
978 the dispatcher. The main reason for doing this is that
979 we can now evaluate the return value and parameter values
980 according to their known data types, in case we need to
981 do things like promotion, dereferencing, special handling
982 of structs and doubles, etc.
984 We want to use the type signature of 'method', but still
985 jump to objc_msgSend() or objc_msgSend_stret() to better
986 mimic the behavior of the runtime. */
990 if (TYPE_CODE (value_type (method
)) != TYPE_CODE_FUNC
)
991 error (_("method address has symbol information with non-function type; skipping"));
993 VALUE_ADDRESS (method
) = value_as_address (msg_send_stret
);
995 VALUE_ADDRESS (method
) = value_as_address (msg_send
);
996 called_method
= method
;
1001 called_method
= msg_send_stret
;
1003 called_method
= msg_send
;
1006 if (noside
== EVAL_SKIP
)
1009 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1011 /* If the return type doesn't look like a function type,
1012 call an error. This can happen if somebody tries to
1013 turn a variable into a function call. This is here
1014 because people often want to call, eg, strcmp, which
1015 gdb doesn't know is a function. If gdb isn't asked for
1016 it's opinion (ie. through "whatis"), it won't offer
1019 struct type
*type
= value_type (called_method
);
1020 if (type
&& TYPE_CODE (type
) == TYPE_CODE_PTR
)
1021 type
= TYPE_TARGET_TYPE (type
);
1022 type
= TYPE_TARGET_TYPE (type
);
1026 if ((TYPE_CODE (type
) == TYPE_CODE_ERROR
) && expect_type
)
1027 return allocate_value (expect_type
);
1029 return allocate_value (type
);
1032 error (_("Expression of type other than \"method returning ...\" used as a method"));
1035 /* Now depending on whether we found a symbol for the method,
1036 we will either call the runtime dispatcher or the method
1039 argvec
[0] = called_method
;
1041 argvec
[2] = value_from_longest (builtin_type_long
, selector
);
1042 /* User-supplied arguments. */
1043 for (tem
= 0; tem
< nargs
; tem
++)
1044 argvec
[tem
+ 3] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
1045 argvec
[tem
+ 3] = 0;
1047 if (gnu_runtime
&& (method
!= NULL
))
1049 /* Function objc_msg_lookup returns a pointer. */
1050 deprecated_set_value_type (argvec
[0],
1051 lookup_function_type (lookup_pointer_type (value_type (argvec
[0]))));
1052 argvec
[0] = call_function_by_hand (argvec
[0], nargs
+ 2, argvec
+ 1);
1055 ret
= call_function_by_hand (argvec
[0], nargs
+ 2, argvec
+ 1);
1062 op
= exp
->elts
[*pos
].opcode
;
1063 nargs
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1064 /* Allocate arg vector, including space for the function to be
1065 called in argvec[0] and a terminating NULL */
1066 argvec
= (struct value
**) alloca (sizeof (struct value
*) * (nargs
+ 3));
1067 if (op
== STRUCTOP_MEMBER
|| op
== STRUCTOP_MPTR
)
1070 /* First, evaluate the structure into arg2 */
1073 if (noside
== EVAL_SKIP
)
1076 if (op
== STRUCTOP_MEMBER
)
1078 arg2
= evaluate_subexp_for_address (exp
, pos
, noside
);
1082 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1085 /* If the function is a virtual function, then the
1086 aggregate value (providing the structure) plays
1087 its part by providing the vtable. Otherwise,
1088 it is just along for the ride: call the function
1091 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1093 if (TYPE_CODE (check_typedef (value_type (arg1
)))
1094 != TYPE_CODE_METHODPTR
)
1095 error (_("Non-pointer-to-member value used in pointer-to-member "
1098 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1100 struct type
*method_type
= check_typedef (value_type (arg1
));
1101 arg1
= value_zero (method_type
, not_lval
);
1104 arg1
= cplus_method_ptr_to_value (&arg2
, arg1
);
1106 /* Now, say which argument to start evaluating from */
1109 else if (op
== STRUCTOP_STRUCT
|| op
== STRUCTOP_PTR
)
1111 /* Hair for method invocations */
1115 /* First, evaluate the structure into arg2 */
1117 tem2
= longest_to_int (exp
->elts
[pc2
+ 1].longconst
);
1118 *pos
+= 3 + BYTES_TO_EXP_ELEM (tem2
+ 1);
1119 if (noside
== EVAL_SKIP
)
1122 if (op
== STRUCTOP_STRUCT
)
1124 /* If v is a variable in a register, and the user types
1125 v.method (), this will produce an error, because v has
1128 A possible way around this would be to allocate a
1129 copy of the variable on the stack, copy in the
1130 contents, call the function, and copy out the
1131 contents. I.e. convert this from call by reference
1132 to call by copy-return (or whatever it's called).
1133 However, this does not work because it is not the
1134 same: the method being called could stash a copy of
1135 the address, and then future uses through that address
1136 (after the method returns) would be expected to
1137 use the variable itself, not some copy of it. */
1138 arg2
= evaluate_subexp_for_address (exp
, pos
, noside
);
1142 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1144 /* Now, say which argument to start evaluating from */
1149 /* Non-method function call */
1151 argvec
[0] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
1153 type
= value_type (argvec
[0]);
1154 if (type
&& TYPE_CODE (type
) == TYPE_CODE_PTR
)
1155 type
= TYPE_TARGET_TYPE (type
);
1156 if (type
&& TYPE_CODE (type
) == TYPE_CODE_FUNC
)
1158 for (; tem
<= nargs
&& tem
<= TYPE_NFIELDS (type
); tem
++)
1160 /* pai: FIXME This seems to be coercing arguments before
1161 * overload resolution has been done! */
1162 argvec
[tem
] = evaluate_subexp (TYPE_FIELD_TYPE (type
, tem
- 1),
1168 /* Evaluate arguments */
1169 for (; tem
<= nargs
; tem
++)
1171 /* Ensure that array expressions are coerced into pointer objects. */
1172 argvec
[tem
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
1175 /* signal end of arglist */
1178 if (op
== STRUCTOP_STRUCT
|| op
== STRUCTOP_PTR
)
1180 int static_memfuncp
;
1183 /* Method invocation : stuff "this" as first parameter */
1185 /* Name of method from expression */
1186 strcpy (tstr
, &exp
->elts
[pc2
+ 2].string
);
1188 if (overload_resolution
&& (exp
->language_defn
->la_language
== language_cplus
))
1190 /* Language is C++, do some overload resolution before evaluation */
1191 struct value
*valp
= NULL
;
1193 /* Prepare list of argument types for overload resolution */
1194 arg_types
= (struct type
**) alloca (nargs
* (sizeof (struct type
*)));
1195 for (ix
= 1; ix
<= nargs
; ix
++)
1196 arg_types
[ix
- 1] = value_type (argvec
[ix
]);
1198 (void) find_overload_match (arg_types
, nargs
, tstr
,
1199 1 /* method */ , 0 /* strict match */ ,
1200 &arg2
/* the object */ , NULL
,
1201 &valp
, NULL
, &static_memfuncp
);
1204 argvec
[1] = arg2
; /* the ``this'' pointer */
1205 argvec
[0] = valp
; /* use the method found after overload resolution */
1208 /* Non-C++ case -- or no overload resolution */
1210 struct value
*temp
= arg2
;
1211 argvec
[0] = value_struct_elt (&temp
, argvec
+ 1, tstr
,
1213 op
== STRUCTOP_STRUCT
1214 ? "structure" : "structure pointer");
1215 /* value_struct_elt updates temp with the correct value
1216 of the ``this'' pointer if necessary, so modify argvec[1] to
1217 reflect any ``this'' changes. */
1218 arg2
= value_from_longest (lookup_pointer_type(value_type (temp
)),
1219 VALUE_ADDRESS (temp
) + value_offset (temp
)
1220 + value_embedded_offset (temp
));
1221 argvec
[1] = arg2
; /* the ``this'' pointer */
1224 if (static_memfuncp
)
1226 argvec
[1] = argvec
[0];
1231 else if (op
== STRUCTOP_MEMBER
|| op
== STRUCTOP_MPTR
)
1236 else if (op
== OP_VAR_VALUE
)
1238 /* Non-member function being called */
1239 /* fn: This can only be done for C++ functions. A C-style function
1240 in a C++ program, for instance, does not have the fields that
1241 are expected here */
1243 if (overload_resolution
&& (exp
->language_defn
->la_language
== language_cplus
))
1245 /* Language is C++, do some overload resolution before evaluation */
1246 struct symbol
*symp
;
1248 /* Prepare list of argument types for overload resolution */
1249 arg_types
= (struct type
**) alloca (nargs
* (sizeof (struct type
*)));
1250 for (ix
= 1; ix
<= nargs
; ix
++)
1251 arg_types
[ix
- 1] = value_type (argvec
[ix
]);
1253 (void) find_overload_match (arg_types
, nargs
, NULL
/* no need for name */ ,
1254 0 /* not method */ , 0 /* strict match */ ,
1255 NULL
, exp
->elts
[save_pos1
+2].symbol
/* the function */ ,
1258 /* Now fix the expression being evaluated */
1259 exp
->elts
[save_pos1
+2].symbol
= symp
;
1260 argvec
[0] = evaluate_subexp_with_coercion (exp
, &save_pos1
, noside
);
1264 /* Not C++, or no overload resolution allowed */
1265 /* nothing to be done; argvec already correctly set up */
1270 /* It is probably a C-style function */
1271 /* nothing to be done; argvec already correctly set up */
1276 if (noside
== EVAL_SKIP
)
1278 if (argvec
[0] == NULL
)
1279 error (_("Cannot evaluate function -- may be inlined"));
1280 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1282 /* If the return type doesn't look like a function type, call an
1283 error. This can happen if somebody tries to turn a variable into
1284 a function call. This is here because people often want to
1285 call, eg, strcmp, which gdb doesn't know is a function. If
1286 gdb isn't asked for it's opinion (ie. through "whatis"),
1287 it won't offer it. */
1289 struct type
*ftype
=
1290 TYPE_TARGET_TYPE (value_type (argvec
[0]));
1293 return allocate_value (TYPE_TARGET_TYPE (value_type (argvec
[0])));
1295 error (_("Expression of type other than \"Function returning ...\" used as function"));
1297 return call_function_by_hand (argvec
[0], nargs
, argvec
+ 1);
1298 /* pai: FIXME save value from call_function_by_hand, then adjust pc by adjust_fn_pc if +ve */
1300 case OP_F77_UNDETERMINED_ARGLIST
:
1302 /* Remember that in F77, functions, substring ops and
1303 array subscript operations cannot be disambiguated
1304 at parse time. We have made all array subscript operations,
1305 substring operations as well as function calls come here
1306 and we now have to discover what the heck this thing actually was.
1307 If it is a function, we process just as if we got an OP_FUNCALL. */
1309 nargs
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1312 /* First determine the type code we are dealing with. */
1313 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1314 type
= check_typedef (value_type (arg1
));
1315 code
= TYPE_CODE (type
);
1317 if (code
== TYPE_CODE_PTR
)
1319 /* Fortran always passes variable to subroutines as pointer.
1320 So we need to look into its target type to see if it is
1321 array, string or function. If it is, we need to switch
1322 to the target value the original one points to. */
1323 struct type
*target_type
= check_typedef (TYPE_TARGET_TYPE (type
));
1325 if (TYPE_CODE (target_type
) == TYPE_CODE_ARRAY
1326 || TYPE_CODE (target_type
) == TYPE_CODE_STRING
1327 || TYPE_CODE (target_type
) == TYPE_CODE_FUNC
)
1329 arg1
= value_ind (arg1
);
1330 type
= check_typedef (value_type (arg1
));
1331 code
= TYPE_CODE (type
);
1337 case TYPE_CODE_ARRAY
:
1338 if (exp
->elts
[*pos
].opcode
== OP_F90_RANGE
)
1339 return value_f90_subarray (arg1
, exp
, pos
, noside
);
1341 goto multi_f77_subscript
;
1343 case TYPE_CODE_STRING
:
1344 if (exp
->elts
[*pos
].opcode
== OP_F90_RANGE
)
1345 return value_f90_subarray (arg1
, exp
, pos
, noside
);
1348 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1349 return value_subscript (arg1
, arg2
);
1353 case TYPE_CODE_FUNC
:
1354 /* It's a function call. */
1355 /* Allocate arg vector, including space for the function to be
1356 called in argvec[0] and a terminating NULL */
1357 argvec
= (struct value
**) alloca (sizeof (struct value
*) * (nargs
+ 2));
1360 for (; tem
<= nargs
; tem
++)
1361 argvec
[tem
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
1362 argvec
[tem
] = 0; /* signal end of arglist */
1366 error (_("Cannot perform substring on this type"));
1370 /* We have a complex number, There should be 2 floating
1371 point numbers that compose it */
1372 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1373 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1375 return value_literal_complex (arg1
, arg2
, builtin_type_f_complex_s16
);
1377 case STRUCTOP_STRUCT
:
1378 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1379 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1380 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1381 if (noside
== EVAL_SKIP
)
1383 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1384 return value_zero (lookup_struct_elt_type (value_type (arg1
),
1385 &exp
->elts
[pc
+ 2].string
,
1390 struct value
*temp
= arg1
;
1391 return value_struct_elt (&temp
, NULL
, &exp
->elts
[pc
+ 2].string
,
1396 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1397 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1398 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1399 if (noside
== EVAL_SKIP
)
1402 /* JYG: if print object is on we need to replace the base type
1403 with rtti type in order to continue on with successful
1404 lookup of member / method only available in the rtti type. */
1406 struct type
*type
= value_type (arg1
);
1407 struct type
*real_type
;
1408 int full
, top
, using_enc
;
1410 if (objectprint
&& TYPE_TARGET_TYPE(type
) &&
1411 (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
1413 real_type
= value_rtti_target_type (arg1
, &full
, &top
, &using_enc
);
1416 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
1417 real_type
= lookup_pointer_type (real_type
);
1419 real_type
= lookup_reference_type (real_type
);
1421 arg1
= value_cast (real_type
, arg1
);
1426 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1427 return value_zero (lookup_struct_elt_type (value_type (arg1
),
1428 &exp
->elts
[pc
+ 2].string
,
1433 struct value
*temp
= arg1
;
1434 return value_struct_elt (&temp
, NULL
, &exp
->elts
[pc
+ 2].string
,
1435 NULL
, "structure pointer");
1438 case STRUCTOP_MEMBER
:
1440 if (op
== STRUCTOP_MEMBER
)
1441 arg1
= evaluate_subexp_for_address (exp
, pos
, noside
);
1443 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1445 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1447 if (noside
== EVAL_SKIP
)
1450 type
= check_typedef (value_type (arg2
));
1451 switch (TYPE_CODE (type
))
1453 case TYPE_CODE_METHODPTR
:
1454 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1455 return value_zero (TYPE_TARGET_TYPE (type
), not_lval
);
1458 arg2
= cplus_method_ptr_to_value (&arg1
, arg2
);
1459 gdb_assert (TYPE_CODE (value_type (arg2
)) == TYPE_CODE_PTR
);
1460 return value_ind (arg2
);
1463 case TYPE_CODE_MEMBERPTR
:
1464 /* Now, convert these values to an address. */
1465 arg1
= value_cast (lookup_pointer_type (TYPE_DOMAIN_TYPE (type
)),
1468 mem_offset
= value_as_long (arg2
);
1470 arg3
= value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
1471 value_as_long (arg1
) + mem_offset
);
1472 return value_ind (arg3
);
1475 error (_("non-pointer-to-member value used in pointer-to-member construct"));
1479 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1480 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1481 if (noside
== EVAL_SKIP
)
1483 if (binop_user_defined_p (op
, arg1
, arg2
))
1484 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1486 return value_concat (arg1
, arg2
);
1489 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1490 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1492 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
1494 if (binop_user_defined_p (op
, arg1
, arg2
))
1495 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1497 return value_assign (arg1
, arg2
);
1499 case BINOP_ASSIGN_MODIFY
:
1501 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1502 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1503 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
1505 op
= exp
->elts
[pc
+ 1].opcode
;
1506 if (binop_user_defined_p (op
, arg1
, arg2
))
1507 return value_x_binop (arg1
, arg2
, BINOP_ASSIGN_MODIFY
, op
, noside
);
1508 else if (op
== BINOP_ADD
)
1509 arg2
= value_add (arg1
, arg2
);
1510 else if (op
== BINOP_SUB
)
1511 arg2
= value_sub (arg1
, arg2
);
1513 arg2
= value_binop (arg1
, arg2
, op
);
1514 return value_assign (arg1
, arg2
);
1517 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1518 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1519 if (noside
== EVAL_SKIP
)
1521 if (binop_user_defined_p (op
, arg1
, arg2
))
1522 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1524 return value_add (arg1
, arg2
);
1527 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1528 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1529 if (noside
== EVAL_SKIP
)
1531 if (binop_user_defined_p (op
, arg1
, arg2
))
1532 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1534 return value_sub (arg1
, arg2
);
1544 case BINOP_BITWISE_AND
:
1545 case BINOP_BITWISE_IOR
:
1546 case BINOP_BITWISE_XOR
:
1547 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1548 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1549 if (noside
== EVAL_SKIP
)
1551 if (binop_user_defined_p (op
, arg1
, arg2
))
1552 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1555 /* If EVAL_AVOID_SIDE_EFFECTS and we're dividing by zero,
1556 fudge arg2 to avoid division-by-zero, the caller is
1557 (theoretically) only looking for the type of the result. */
1558 if (noside
== EVAL_AVOID_SIDE_EFFECTS
1559 /* ??? Do we really want to test for BINOP_MOD here?
1560 The implementation of value_binop gives it a well-defined
1563 || op
== BINOP_INTDIV
1566 && value_logical_not (arg2
))
1568 struct value
*v_one
, *retval
;
1570 v_one
= value_one (value_type (arg2
), not_lval
);
1571 retval
= value_binop (arg1
, v_one
, op
);
1575 return value_binop (arg1
, arg2
, op
);
1579 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1580 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1581 if (noside
== EVAL_SKIP
)
1583 error (_("':' operator used in invalid context"));
1585 case BINOP_SUBSCRIPT
:
1586 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1587 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1588 if (noside
== EVAL_SKIP
)
1590 if (binop_user_defined_p (op
, arg1
, arg2
))
1591 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1594 /* If the user attempts to subscript something that is not an
1595 array or pointer type (like a plain int variable for example),
1596 then report this as an error. */
1598 arg1
= coerce_ref (arg1
);
1599 type
= check_typedef (value_type (arg1
));
1600 if (TYPE_CODE (type
) != TYPE_CODE_ARRAY
1601 && TYPE_CODE (type
) != TYPE_CODE_PTR
)
1603 if (TYPE_NAME (type
))
1604 error (_("cannot subscript something of type `%s'"),
1607 error (_("cannot subscript requested type"));
1610 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1611 return value_zero (TYPE_TARGET_TYPE (type
), VALUE_LVAL (arg1
));
1613 return value_subscript (arg1
, arg2
);
1617 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1618 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1619 if (noside
== EVAL_SKIP
)
1621 return value_in (arg1
, arg2
);
1623 case MULTI_SUBSCRIPT
:
1625 nargs
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1626 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1629 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1630 /* FIXME: EVAL_SKIP handling may not be correct. */
1631 if (noside
== EVAL_SKIP
)
1642 /* FIXME: EVAL_AVOID_SIDE_EFFECTS handling may not be correct. */
1643 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1645 /* If the user attempts to subscript something that has no target
1646 type (like a plain int variable for example), then report this
1649 type
= TYPE_TARGET_TYPE (check_typedef (value_type (arg1
)));
1652 arg1
= value_zero (type
, VALUE_LVAL (arg1
));
1658 error (_("cannot subscript something of type `%s'"),
1659 TYPE_NAME (value_type (arg1
)));
1663 if (binop_user_defined_p (op
, arg1
, arg2
))
1665 arg1
= value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1669 arg1
= value_subscript (arg1
, arg2
);
1674 multi_f77_subscript
:
1676 int subscript_array
[MAX_FORTRAN_DIMS
];
1677 int array_size_array
[MAX_FORTRAN_DIMS
];
1678 int ndimensions
= 1, i
;
1679 struct type
*tmp_type
;
1680 int offset_item
; /* The array offset where the item lives */
1682 if (nargs
> MAX_FORTRAN_DIMS
)
1683 error (_("Too many subscripts for F77 (%d Max)"), MAX_FORTRAN_DIMS
);
1685 tmp_type
= check_typedef (value_type (arg1
));
1686 ndimensions
= calc_f77_array_dims (type
);
1688 if (nargs
!= ndimensions
)
1689 error (_("Wrong number of subscripts"));
1691 /* Now that we know we have a legal array subscript expression
1692 let us actually find out where this element exists in the array. */
1695 /* Take array indices left to right */
1696 for (i
= 0; i
< nargs
; i
++)
1698 /* Evaluate each subscript, It must be a legal integer in F77 */
1699 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
1701 /* Fill in the subscript and array size arrays */
1703 subscript_array
[i
] = value_as_long (arg2
);
1706 /* Internal type of array is arranged right to left */
1707 for (i
= 0; i
< nargs
; i
++)
1709 retcode
= f77_get_dynamic_upperbound (tmp_type
, &upper
);
1710 if (retcode
== BOUND_FETCH_ERROR
)
1711 error (_("Cannot obtain dynamic upper bound"));
1713 retcode
= f77_get_dynamic_lowerbound (tmp_type
, &lower
);
1714 if (retcode
== BOUND_FETCH_ERROR
)
1715 error (_("Cannot obtain dynamic lower bound"));
1717 array_size_array
[nargs
- i
- 1] = upper
- lower
+ 1;
1719 /* Zero-normalize subscripts so that offsetting will work. */
1721 subscript_array
[nargs
- i
- 1] -= lower
;
1723 /* If we are at the bottom of a multidimensional
1724 array type then keep a ptr to the last ARRAY
1725 type around for use when calling value_subscript()
1726 below. This is done because we pretend to value_subscript
1727 that we actually have a one-dimensional array
1728 of base element type that we apply a simple
1732 tmp_type
= check_typedef (TYPE_TARGET_TYPE (tmp_type
));
1735 /* Now let us calculate the offset for this item */
1737 offset_item
= subscript_array
[ndimensions
- 1];
1739 for (i
= ndimensions
- 1; i
> 0; --i
)
1741 array_size_array
[i
- 1] * offset_item
+ subscript_array
[i
- 1];
1743 /* Construct a value node with the value of the offset */
1745 arg2
= value_from_longest (builtin_type_f_integer
, offset_item
);
1747 /* Let us now play a dirty trick: we will take arg1
1748 which is a value node pointing to the topmost level
1749 of the multidimensional array-set and pretend
1750 that it is actually a array of the final element
1751 type, this will ensure that value_subscript()
1752 returns the correct type value */
1754 deprecated_set_value_type (arg1
, tmp_type
);
1755 return value_subscripted_rvalue (arg1
, arg2
, 0);
1758 case BINOP_LOGICAL_AND
:
1759 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1760 if (noside
== EVAL_SKIP
)
1762 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1767 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
1770 if (binop_user_defined_p (op
, arg1
, arg2
))
1772 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1773 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1777 tem
= value_logical_not (arg1
);
1778 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
,
1779 (tem
? EVAL_SKIP
: noside
));
1780 return value_from_longest (LA_BOOL_TYPE
,
1781 (LONGEST
) (!tem
&& !value_logical_not (arg2
)));
1784 case BINOP_LOGICAL_OR
:
1785 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1786 if (noside
== EVAL_SKIP
)
1788 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1793 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
1796 if (binop_user_defined_p (op
, arg1
, arg2
))
1798 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1799 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1803 tem
= value_logical_not (arg1
);
1804 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
,
1805 (!tem
? EVAL_SKIP
: noside
));
1806 return value_from_longest (LA_BOOL_TYPE
,
1807 (LONGEST
) (!tem
|| !value_logical_not (arg2
)));
1811 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1812 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1813 if (noside
== EVAL_SKIP
)
1815 if (binop_user_defined_p (op
, arg1
, arg2
))
1817 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1821 tem
= value_equal (arg1
, arg2
);
1822 return value_from_longest (LA_BOOL_TYPE
, (LONGEST
) tem
);
1825 case BINOP_NOTEQUAL
:
1826 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1827 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1828 if (noside
== EVAL_SKIP
)
1830 if (binop_user_defined_p (op
, arg1
, arg2
))
1832 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1836 tem
= value_equal (arg1
, arg2
);
1837 return value_from_longest (LA_BOOL_TYPE
, (LONGEST
) ! tem
);
1841 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1842 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1843 if (noside
== EVAL_SKIP
)
1845 if (binop_user_defined_p (op
, arg1
, arg2
))
1847 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1851 tem
= value_less (arg1
, arg2
);
1852 return value_from_longest (LA_BOOL_TYPE
, (LONGEST
) tem
);
1856 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1857 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1858 if (noside
== EVAL_SKIP
)
1860 if (binop_user_defined_p (op
, arg1
, arg2
))
1862 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1866 tem
= value_less (arg2
, arg1
);
1867 return value_from_longest (LA_BOOL_TYPE
, (LONGEST
) tem
);
1871 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1872 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1873 if (noside
== EVAL_SKIP
)
1875 if (binop_user_defined_p (op
, arg1
, arg2
))
1877 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1881 tem
= value_less (arg2
, arg1
) || value_equal (arg1
, arg2
);
1882 return value_from_longest (LA_BOOL_TYPE
, (LONGEST
) tem
);
1886 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1887 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
1888 if (noside
== EVAL_SKIP
)
1890 if (binop_user_defined_p (op
, arg1
, arg2
))
1892 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1896 tem
= value_less (arg1
, arg2
) || value_equal (arg1
, arg2
);
1897 return value_from_longest (LA_BOOL_TYPE
, (LONGEST
) tem
);
1901 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1902 arg2
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1903 if (noside
== EVAL_SKIP
)
1905 type
= check_typedef (value_type (arg2
));
1906 if (TYPE_CODE (type
) != TYPE_CODE_INT
)
1907 error (_("Non-integral right operand for \"@\" operator."));
1908 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1910 return allocate_repeat_value (value_type (arg1
),
1911 longest_to_int (value_as_long (arg2
)));
1914 return value_repeat (arg1
, longest_to_int (value_as_long (arg2
)));
1917 evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1918 return evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1921 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1922 if (noside
== EVAL_SKIP
)
1924 if (unop_user_defined_p (op
, arg1
))
1925 return value_x_unop (arg1
, op
, noside
);
1927 return value_pos (arg1
);
1930 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1931 if (noside
== EVAL_SKIP
)
1933 if (unop_user_defined_p (op
, arg1
))
1934 return value_x_unop (arg1
, op
, noside
);
1936 return value_neg (arg1
);
1938 case UNOP_COMPLEMENT
:
1939 /* C++: check for and handle destructor names. */
1940 op
= exp
->elts
[*pos
].opcode
;
1942 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1943 if (noside
== EVAL_SKIP
)
1945 if (unop_user_defined_p (UNOP_COMPLEMENT
, arg1
))
1946 return value_x_unop (arg1
, UNOP_COMPLEMENT
, noside
);
1948 return value_complement (arg1
);
1950 case UNOP_LOGICAL_NOT
:
1951 arg1
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
1952 if (noside
== EVAL_SKIP
)
1954 if (unop_user_defined_p (op
, arg1
))
1955 return value_x_unop (arg1
, op
, noside
);
1957 return value_from_longest (LA_BOOL_TYPE
,
1958 (LONGEST
) value_logical_not (arg1
));
1961 if (expect_type
&& TYPE_CODE (expect_type
) == TYPE_CODE_PTR
)
1962 expect_type
= TYPE_TARGET_TYPE (check_typedef (expect_type
));
1963 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
1964 type
= check_typedef (value_type (arg1
));
1965 if (TYPE_CODE (type
) == TYPE_CODE_METHODPTR
1966 || TYPE_CODE (type
) == TYPE_CODE_MEMBERPTR
)
1967 error (_("Attempt to dereference pointer to member without an object"));
1968 if (noside
== EVAL_SKIP
)
1970 if (unop_user_defined_p (op
, arg1
))
1971 return value_x_unop (arg1
, op
, noside
);
1972 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1974 type
= check_typedef (value_type (arg1
));
1975 if (TYPE_CODE (type
) == TYPE_CODE_PTR
1976 || TYPE_CODE (type
) == TYPE_CODE_REF
1977 /* In C you can dereference an array to get the 1st elt. */
1978 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
1980 return value_zero (TYPE_TARGET_TYPE (type
),
1982 else if (TYPE_CODE (type
) == TYPE_CODE_INT
)
1983 /* GDB allows dereferencing an int. */
1984 return value_zero (builtin_type_int
, lval_memory
);
1986 error (_("Attempt to take contents of a non-pointer value."));
1988 return value_ind (arg1
);
1991 /* C++: check for and handle pointer to members. */
1993 op
= exp
->elts
[*pos
].opcode
;
1995 if (noside
== EVAL_SKIP
)
1997 evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_SKIP
);
2002 struct value
*retvalp
= evaluate_subexp_for_address (exp
, pos
, noside
);
2007 if (noside
== EVAL_SKIP
)
2009 evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_SKIP
);
2012 return evaluate_subexp_for_sizeof (exp
, pos
);
2016 type
= exp
->elts
[pc
+ 1].type
;
2017 arg1
= evaluate_subexp (type
, exp
, pos
, noside
);
2018 if (noside
== EVAL_SKIP
)
2020 if (type
!= value_type (arg1
))
2021 arg1
= value_cast (type
, arg1
);
2026 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2027 if (noside
== EVAL_SKIP
)
2029 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2030 return value_zero (exp
->elts
[pc
+ 1].type
, lval_memory
);
2032 return value_at_lazy (exp
->elts
[pc
+ 1].type
,
2033 value_as_address (arg1
));
2035 case UNOP_MEMVAL_TLS
:
2037 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2038 if (noside
== EVAL_SKIP
)
2040 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2041 return value_zero (exp
->elts
[pc
+ 2].type
, lval_memory
);
2045 tls_addr
= target_translate_tls_address (exp
->elts
[pc
+ 1].objfile
,
2046 value_as_address (arg1
));
2047 return value_at_lazy (exp
->elts
[pc
+ 2].type
, tls_addr
);
2050 case UNOP_PREINCREMENT
:
2051 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2052 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2054 else if (unop_user_defined_p (op
, arg1
))
2056 return value_x_unop (arg1
, op
, noside
);
2060 arg2
= value_add (arg1
, value_from_longest (builtin_type_char
,
2062 return value_assign (arg1
, arg2
);
2065 case UNOP_PREDECREMENT
:
2066 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2067 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2069 else if (unop_user_defined_p (op
, arg1
))
2071 return value_x_unop (arg1
, op
, noside
);
2075 arg2
= value_sub (arg1
, value_from_longest (builtin_type_char
,
2077 return value_assign (arg1
, arg2
);
2080 case UNOP_POSTINCREMENT
:
2081 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2082 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2084 else if (unop_user_defined_p (op
, arg1
))
2086 return value_x_unop (arg1
, op
, noside
);
2090 arg2
= value_add (arg1
, value_from_longest (builtin_type_char
,
2092 value_assign (arg1
, arg2
);
2096 case UNOP_POSTDECREMENT
:
2097 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2098 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2100 else if (unop_user_defined_p (op
, arg1
))
2102 return value_x_unop (arg1
, op
, noside
);
2106 arg2
= value_sub (arg1
, value_from_longest (builtin_type_char
,
2108 value_assign (arg1
, arg2
);
2114 return value_of_this (1);
2118 return value_of_local ("self", 1);
2121 /* The value is not supposed to be used. This is here to make it
2122 easier to accommodate expressions that contain types. */
2124 if (noside
== EVAL_SKIP
)
2126 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2127 return allocate_value (exp
->elts
[pc
+ 1].type
);
2129 error (_("Attempt to use a type name as an expression"));
2132 /* Removing this case and compiling with gcc -Wall reveals that
2133 a lot of cases are hitting this case. Some of these should
2134 probably be removed from expression.h; others are legitimate
2135 expressions which are (apparently) not fully implemented.
2137 If there are any cases landing here which mean a user error,
2138 then they should be separate cases, with more descriptive
2142 GDB does not (yet) know how to evaluate that kind of expression"));
2146 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
2149 /* Evaluate a subexpression of EXP, at index *POS,
2150 and return the address of that subexpression.
2151 Advance *POS over the subexpression.
2152 If the subexpression isn't an lvalue, get an error.
2153 NOSIDE may be EVAL_AVOID_SIDE_EFFECTS;
2154 then only the type of the result need be correct. */
2156 static struct value
*
2157 evaluate_subexp_for_address (struct expression
*exp
, int *pos
,
2167 op
= exp
->elts
[pc
].opcode
;
2173 x
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
2175 /* We can't optimize out "&*" if there's a user-defined operator*. */
2176 if (unop_user_defined_p (op
, x
))
2178 x
= value_x_unop (x
, op
, noside
);
2179 goto default_case_after_eval
;
2186 return value_cast (lookup_pointer_type (exp
->elts
[pc
+ 1].type
),
2187 evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
));
2190 var
= exp
->elts
[pc
+ 2].symbol
;
2192 /* C++: The "address" of a reference should yield the address
2193 * of the object pointed to. Let value_addr() deal with it. */
2194 if (TYPE_CODE (SYMBOL_TYPE (var
)) == TYPE_CODE_REF
)
2198 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2201 lookup_pointer_type (SYMBOL_TYPE (var
));
2202 enum address_class sym_class
= SYMBOL_CLASS (var
);
2204 if (sym_class
== LOC_CONST
2205 || sym_class
== LOC_CONST_BYTES
2206 || sym_class
== LOC_REGISTER
)
2207 error (_("Attempt to take address of register or constant."));
2210 value_zero (type
, not_lval
);
2212 else if (symbol_read_needs_frame (var
))
2216 block_innermost_frame (exp
->elts
[pc
+ 1].block
));
2218 return locate_var_value (var
, NULL
);
2221 tem
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
2222 (*pos
) += 5 + BYTES_TO_EXP_ELEM (tem
+ 1);
2223 x
= value_aggregate_elt (exp
->elts
[pc
+ 1].type
,
2224 &exp
->elts
[pc
+ 3].string
,
2227 error (_("There is no field named %s"), &exp
->elts
[pc
+ 3].string
);
2232 x
= evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
2233 default_case_after_eval
:
2234 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2236 struct type
*type
= check_typedef (value_type (x
));
2238 if (VALUE_LVAL (x
) == lval_memory
|| value_must_coerce_to_target (x
))
2239 return value_zero (lookup_pointer_type (value_type (x
)),
2241 else if (TYPE_CODE (type
) == TYPE_CODE_REF
)
2242 return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
2245 error (_("Attempt to take address of value not located in memory."));
2247 return value_addr (x
);
2251 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
2252 When used in contexts where arrays will be coerced anyway, this is
2253 equivalent to `evaluate_subexp' but much faster because it avoids
2254 actually fetching array contents (perhaps obsolete now that we have
2257 Note that we currently only do the coercion for C expressions, where
2258 arrays are zero based and the coercion is correct. For other languages,
2259 with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION
2260 to decide if coercion is appropriate.
2265 evaluate_subexp_with_coercion (struct expression
*exp
,
2266 int *pos
, enum noside noside
)
2274 op
= exp
->elts
[pc
].opcode
;
2279 var
= exp
->elts
[pc
+ 2].symbol
;
2280 if (TYPE_CODE (check_typedef (SYMBOL_TYPE (var
))) == TYPE_CODE_ARRAY
2281 && CAST_IS_CONVERSION
)
2286 (var
, block_innermost_frame (exp
->elts
[pc
+ 1].block
));
2287 return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (check_typedef (SYMBOL_TYPE (var
)))),
2293 return evaluate_subexp (NULL_TYPE
, exp
, pos
, noside
);
2297 /* Evaluate a subexpression of EXP, at index *POS,
2298 and return a value for the size of that subexpression.
2299 Advance *POS over the subexpression. */
2301 static struct value
*
2302 evaluate_subexp_for_sizeof (struct expression
*exp
, int *pos
)
2310 op
= exp
->elts
[pc
].opcode
;
2314 /* This case is handled specially
2315 so that we avoid creating a value for the result type.
2316 If the result type is very big, it's desirable not to
2317 create a value unnecessarily. */
2320 val
= evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2321 type
= check_typedef (value_type (val
));
2322 if (TYPE_CODE (type
) != TYPE_CODE_PTR
2323 && TYPE_CODE (type
) != TYPE_CODE_REF
2324 && TYPE_CODE (type
) != TYPE_CODE_ARRAY
)
2325 error (_("Attempt to take contents of a non-pointer value."));
2326 type
= check_typedef (TYPE_TARGET_TYPE (type
));
2327 return value_from_longest (builtin_type_int
, (LONGEST
)
2328 TYPE_LENGTH (type
));
2332 type
= check_typedef (exp
->elts
[pc
+ 1].type
);
2333 return value_from_longest (builtin_type_int
,
2334 (LONGEST
) TYPE_LENGTH (type
));
2338 type
= check_typedef (SYMBOL_TYPE (exp
->elts
[pc
+ 2].symbol
));
2340 value_from_longest (builtin_type_int
, (LONGEST
) TYPE_LENGTH (type
));
2343 val
= evaluate_subexp (NULL_TYPE
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2344 return value_from_longest (builtin_type_int
,
2345 (LONGEST
) TYPE_LENGTH (value_type (val
)));
2349 /* Parse a type expression in the string [P..P+LENGTH). */
2352 parse_and_eval_type (char *p
, int length
)
2354 char *tmp
= (char *) alloca (length
+ 4);
2355 struct expression
*expr
;
2357 memcpy (tmp
+ 1, p
, length
);
2358 tmp
[length
+ 1] = ')';
2359 tmp
[length
+ 2] = '0';
2360 tmp
[length
+ 3] = '\0';
2361 expr
= parse_expression (tmp
);
2362 if (expr
->elts
[0].opcode
!= UNOP_CAST
)
2363 error (_("Internal error in eval_type."));
2364 return expr
->elts
[1].type
;
2368 calc_f77_array_dims (struct type
*array_type
)
2371 struct type
*tmp_type
;
2373 if ((TYPE_CODE (array_type
) != TYPE_CODE_ARRAY
))
2374 error (_("Can't get dimensions for a non-array type"));
2376 tmp_type
= array_type
;
2378 while ((tmp_type
= TYPE_TARGET_TYPE (tmp_type
)))
2380 if (TYPE_CODE (tmp_type
) == TYPE_CODE_ARRAY
)