1 /* Evaluate expressions for GDB.
3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005 Free
5 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 2 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, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
25 #include "gdb_string.h"
29 #include "expression.h"
32 #include "language.h" /* For CAST_IS_CONVERSION */
33 #include "f-lang.h" /* for array bound stuff */
36 #include "objc-lang.h"
38 #include "parser-defs.h"
39 #include "cp-support.h"
41 /* This is defined in valops.c */
42 extern int overload_resolution;
44 /* JYG: lookup rtti type of STRUCTOP_PTR when this is set to continue
45 on with successful lookup for member/method of the rtti type. */
46 extern int objectprint;
48 /* Prototypes for local functions. */
50 static struct value *evaluate_subexp_for_sizeof (struct expression *, int *);
52 static struct value *evaluate_subexp_for_address (struct expression *,
55 static struct value *evaluate_subexp (struct type *, struct expression *,
58 static char *get_label (struct expression *, int *);
60 static struct value *evaluate_struct_tuple (struct value *,
61 struct expression *, int *,
64 static LONGEST init_array_element (struct value *, struct value *,
65 struct expression *, int *, enum noside,
69 evaluate_subexp (struct type *expect_type, struct expression *exp,
70 int *pos, enum noside noside)
72 return (*exp->language_defn->la_exp_desc->evaluate_exp)
73 (expect_type, exp, pos, noside);
76 /* Parse the string EXP as a C expression, evaluate it,
77 and return the result as a number. */
80 parse_and_eval_address (char *exp)
82 struct expression *expr = parse_expression (exp);
84 struct cleanup *old_chain =
85 make_cleanup (free_current_contents, &expr);
87 addr = value_as_address (evaluate_expression (expr));
88 do_cleanups (old_chain);
92 /* Like parse_and_eval_address but takes a pointer to a char * variable
93 and advanced that variable across the characters parsed. */
96 parse_and_eval_address_1 (char **expptr)
98 struct expression *expr = parse_exp_1 (expptr, (struct block *) 0, 0);
100 struct cleanup *old_chain =
101 make_cleanup (free_current_contents, &expr);
103 addr = value_as_address (evaluate_expression (expr));
104 do_cleanups (old_chain);
108 /* Like parse_and_eval_address, but treats the value of the expression
109 as an integer, not an address, returns a LONGEST, not a CORE_ADDR */
111 parse_and_eval_long (char *exp)
113 struct expression *expr = parse_expression (exp);
115 struct cleanup *old_chain =
116 make_cleanup (free_current_contents, &expr);
118 retval = value_as_long (evaluate_expression (expr));
119 do_cleanups (old_chain);
124 parse_and_eval (char *exp)
126 struct expression *expr = parse_expression (exp);
128 struct cleanup *old_chain =
129 make_cleanup (free_current_contents, &expr);
131 val = evaluate_expression (expr);
132 do_cleanups (old_chain);
136 /* Parse up to a comma (or to a closeparen)
137 in the string EXPP as an expression, evaluate it, and return the value.
138 EXPP is advanced to point to the comma. */
141 parse_to_comma_and_eval (char **expp)
143 struct expression *expr = parse_exp_1 (expp, (struct block *) 0, 1);
145 struct cleanup *old_chain =
146 make_cleanup (free_current_contents, &expr);
148 val = evaluate_expression (expr);
149 do_cleanups (old_chain);
153 /* Evaluate an expression in internal prefix form
154 such as is constructed by parse.y.
156 See expression.h for info on the format of an expression. */
159 evaluate_expression (struct expression *exp)
162 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL);
165 /* Evaluate an expression, avoiding all memory references
166 and getting a value whose type alone is correct. */
169 evaluate_type (struct expression *exp)
172 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
175 /* If the next expression is an OP_LABELED, skips past it,
176 returning the label. Otherwise, does nothing and returns NULL. */
179 get_label (struct expression *exp, int *pos)
181 if (exp->elts[*pos].opcode == OP_LABELED)
184 char *name = &exp->elts[pc + 2].string;
185 int tem = longest_to_int (exp->elts[pc + 1].longconst);
186 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
193 /* This function evaluates tuples (in (the deleted) Chill) or
194 brace-initializers (in C/C++) for structure types. */
196 static struct value *
197 evaluate_struct_tuple (struct value *struct_val,
198 struct expression *exp,
199 int *pos, enum noside noside, int nargs)
201 struct type *struct_type = check_typedef (value_type (struct_val));
202 struct type *substruct_type = struct_type;
203 struct type *field_type;
210 struct value *val = NULL;
215 /* Skip past the labels, and count them. */
216 while (get_label (exp, pos) != NULL)
221 char *label = get_label (exp, &pc);
224 for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
227 char *field_name = TYPE_FIELD_NAME (struct_type, fieldno);
228 if (field_name != NULL && DEPRECATED_STREQ (field_name, label))
231 subfieldno = fieldno;
232 substruct_type = struct_type;
236 for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
239 char *field_name = TYPE_FIELD_NAME (struct_type, fieldno);
240 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
241 if ((field_name == 0 || *field_name == '\0')
242 && TYPE_CODE (field_type) == TYPE_CODE_UNION)
245 for (; variantno < TYPE_NFIELDS (field_type);
249 = TYPE_FIELD_TYPE (field_type, variantno);
250 if (TYPE_CODE (substruct_type) == TYPE_CODE_STRUCT)
253 subfieldno < TYPE_NFIELDS (substruct_type);
256 if (DEPRECATED_STREQ (TYPE_FIELD_NAME (substruct_type,
267 error (_("there is no field named %s"), label);
273 /* Unlabelled tuple element - go to next field. */
277 if (subfieldno >= TYPE_NFIELDS (substruct_type))
280 substruct_type = struct_type;
286 subfieldno = fieldno;
287 if (fieldno >= TYPE_NFIELDS (struct_type))
288 error (_("too many initializers"));
289 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
290 if (TYPE_CODE (field_type) == TYPE_CODE_UNION
291 && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0')
292 error (_("don't know which variant you want to set"));
296 /* Here, struct_type is the type of the inner struct,
297 while substruct_type is the type of the inner struct.
298 These are the same for normal structures, but a variant struct
299 contains anonymous union fields that contain substruct fields.
300 The value fieldno is the index of the top-level (normal or
301 anonymous union) field in struct_field, while the value
302 subfieldno is the index of the actual real (named inner) field
303 in substruct_type. */
305 field_type = TYPE_FIELD_TYPE (substruct_type, subfieldno);
307 val = evaluate_subexp (field_type, exp, pos, noside);
309 /* Now actually set the field in struct_val. */
311 /* Assign val to field fieldno. */
312 if (value_type (val) != field_type)
313 val = value_cast (field_type, val);
315 bitsize = TYPE_FIELD_BITSIZE (substruct_type, subfieldno);
316 bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno);
318 bitpos += TYPE_FIELD_BITPOS (substruct_type, subfieldno);
319 addr = value_contents_writeable (struct_val) + bitpos / 8;
321 modify_field (addr, value_as_long (val),
322 bitpos % 8, bitsize);
324 memcpy (addr, value_contents (val),
325 TYPE_LENGTH (value_type (val)));
327 while (--nlabels > 0);
332 /* Recursive helper function for setting elements of array tuples for
333 (the deleted) Chill. The target is ARRAY (which has bounds
334 LOW_BOUND to HIGH_BOUND); the element value is ELEMENT; EXP, POS
335 and NOSIDE are as usual. Evaluates index expresions and sets the
336 specified element(s) of ARRAY to ELEMENT. Returns last index
340 init_array_element (struct value *array, struct value *element,
341 struct expression *exp, int *pos,
342 enum noside noside, LONGEST low_bound, LONGEST high_bound)
345 int element_size = TYPE_LENGTH (value_type (element));
346 if (exp->elts[*pos].opcode == BINOP_COMMA)
349 init_array_element (array, element, exp, pos, noside,
350 low_bound, high_bound);
351 return init_array_element (array, element,
352 exp, pos, noside, low_bound, high_bound);
354 else if (exp->elts[*pos].opcode == BINOP_RANGE)
358 low = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
359 high = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
360 if (low < low_bound || high > high_bound)
361 error (_("tuple range index out of range"));
362 for (index = low; index <= high; index++)
364 memcpy (value_contents_raw (array)
365 + (index - low_bound) * element_size,
366 value_contents (element), element_size);
371 index = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
372 if (index < low_bound || index > high_bound)
373 error (_("tuple index out of range"));
374 memcpy (value_contents_raw (array) + (index - low_bound) * element_size,
375 value_contents (element), element_size);
381 evaluate_subexp_standard (struct type *expect_type,
382 struct expression *exp, int *pos,
387 int pc, pc2 = 0, oldpos;
388 struct value *arg1 = NULL;
389 struct value *arg2 = NULL;
393 struct value **argvec;
394 int upper, lower, retcode;
398 struct type **arg_types;
402 op = exp->elts[pc].opcode;
407 tem = longest_to_int (exp->elts[pc + 2].longconst);
408 (*pos) += 4 + BYTES_TO_EXP_ELEM (tem + 1);
409 arg1 = value_aggregate_elt (exp->elts[pc + 1].type,
410 &exp->elts[pc + 3].string,
413 error (_("There is no field named %s"), &exp->elts[pc + 3].string);
418 return value_from_longest (exp->elts[pc + 1].type,
419 exp->elts[pc + 2].longconst);
423 return value_from_double (exp->elts[pc + 1].type,
424 exp->elts[pc + 2].doubleconst);
428 if (noside == EVAL_SKIP)
431 /* JYG: We used to just return value_zero of the symbol type
432 if we're asked to avoid side effects. Otherwise we return
433 value_of_variable (...). However I'm not sure if
434 value_of_variable () has any side effect.
435 We need a full value object returned here for whatis_exp ()
436 to call evaluate_type () and then pass the full value to
437 value_rtti_target_type () if we are dealing with a pointer
438 or reference to a base class and print object is on. */
440 return value_of_variable (exp->elts[pc + 2].symbol,
441 exp->elts[pc + 1].block);
446 access_value_history (longest_to_int (exp->elts[pc + 1].longconst));
450 int regno = longest_to_int (exp->elts[pc + 1].longconst);
451 struct value *val = value_of_register (regno, get_selected_frame (NULL));
454 error (_("Value of register %s not available."),
455 frame_map_regnum_to_name (get_selected_frame (NULL), regno));
461 return value_from_longest (LA_BOOL_TYPE,
462 exp->elts[pc + 1].longconst);
466 return value_of_internalvar (exp->elts[pc + 1].internalvar);
469 tem = longest_to_int (exp->elts[pc + 1].longconst);
470 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
471 if (noside == EVAL_SKIP)
473 return value_string (&exp->elts[pc + 2].string, tem);
475 case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant. */
476 tem = longest_to_int (exp->elts[pc + 1].longconst);
477 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
478 if (noside == EVAL_SKIP)
482 return (struct value *) value_nsstring (&exp->elts[pc + 2].string, tem + 1);
485 tem = longest_to_int (exp->elts[pc + 1].longconst);
487 += 3 + BYTES_TO_EXP_ELEM ((tem + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
488 if (noside == EVAL_SKIP)
490 return value_bitstring (&exp->elts[pc + 2].string, tem);
495 tem2 = longest_to_int (exp->elts[pc + 1].longconst);
496 tem3 = longest_to_int (exp->elts[pc + 2].longconst);
497 nargs = tem3 - tem2 + 1;
498 type = expect_type ? check_typedef (expect_type) : NULL_TYPE;
500 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
501 && TYPE_CODE (type) == TYPE_CODE_STRUCT)
503 struct value *rec = allocate_value (expect_type);
504 memset (value_contents_raw (rec), '\0', TYPE_LENGTH (type));
505 return evaluate_struct_tuple (rec, exp, pos, noside, nargs);
508 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
509 && TYPE_CODE (type) == TYPE_CODE_ARRAY)
511 struct type *range_type = TYPE_FIELD_TYPE (type, 0);
512 struct type *element_type = TYPE_TARGET_TYPE (type);
513 struct value *array = allocate_value (expect_type);
514 int element_size = TYPE_LENGTH (check_typedef (element_type));
515 LONGEST low_bound, high_bound, index;
516 if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
519 high_bound = (TYPE_LENGTH (type) / element_size) - 1;
522 memset (value_contents_raw (array), 0, TYPE_LENGTH (expect_type));
523 for (tem = nargs; --nargs >= 0;)
525 struct value *element;
527 if (exp->elts[*pos].opcode == BINOP_RANGE)
530 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
532 element = evaluate_subexp (element_type, exp, pos, noside);
533 if (value_type (element) != element_type)
534 element = value_cast (element_type, element);
537 int continue_pc = *pos;
539 index = init_array_element (array, element, exp, pos, noside,
540 low_bound, high_bound);
545 if (index > high_bound)
546 /* to avoid memory corruption */
547 error (_("Too many array elements"));
548 memcpy (value_contents_raw (array)
549 + (index - low_bound) * element_size,
550 value_contents (element),
558 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
559 && TYPE_CODE (type) == TYPE_CODE_SET)
561 struct value *set = allocate_value (expect_type);
562 char *valaddr = value_contents_raw (set);
563 struct type *element_type = TYPE_INDEX_TYPE (type);
564 struct type *check_type = element_type;
565 LONGEST low_bound, high_bound;
567 /* get targettype of elementtype */
568 while (TYPE_CODE (check_type) == TYPE_CODE_RANGE ||
569 TYPE_CODE (check_type) == TYPE_CODE_TYPEDEF)
570 check_type = TYPE_TARGET_TYPE (check_type);
572 if (get_discrete_bounds (element_type, &low_bound, &high_bound) < 0)
573 error (_("(power)set type with unknown size"));
574 memset (valaddr, '\0', TYPE_LENGTH (type));
575 for (tem = 0; tem < nargs; tem++)
577 LONGEST range_low, range_high;
578 struct type *range_low_type, *range_high_type;
579 struct value *elem_val;
580 if (exp->elts[*pos].opcode == BINOP_RANGE)
583 elem_val = evaluate_subexp (element_type, exp, pos, noside);
584 range_low_type = value_type (elem_val);
585 range_low = value_as_long (elem_val);
586 elem_val = evaluate_subexp (element_type, exp, pos, noside);
587 range_high_type = value_type (elem_val);
588 range_high = value_as_long (elem_val);
592 elem_val = evaluate_subexp (element_type, exp, pos, noside);
593 range_low_type = range_high_type = value_type (elem_val);
594 range_low = range_high = value_as_long (elem_val);
596 /* check types of elements to avoid mixture of elements from
597 different types. Also check if type of element is "compatible"
598 with element type of powerset */
599 if (TYPE_CODE (range_low_type) == TYPE_CODE_RANGE)
600 range_low_type = TYPE_TARGET_TYPE (range_low_type);
601 if (TYPE_CODE (range_high_type) == TYPE_CODE_RANGE)
602 range_high_type = TYPE_TARGET_TYPE (range_high_type);
603 if ((TYPE_CODE (range_low_type) != TYPE_CODE (range_high_type)) ||
604 (TYPE_CODE (range_low_type) == TYPE_CODE_ENUM &&
605 (range_low_type != range_high_type)))
606 /* different element modes */
607 error (_("POWERSET tuple elements of different mode"));
608 if ((TYPE_CODE (check_type) != TYPE_CODE (range_low_type)) ||
609 (TYPE_CODE (check_type) == TYPE_CODE_ENUM &&
610 range_low_type != check_type))
611 error (_("incompatible POWERSET tuple elements"));
612 if (range_low > range_high)
614 warning (_("empty POWERSET tuple range"));
617 if (range_low < low_bound || range_high > high_bound)
618 error (_("POWERSET tuple element out of range"));
619 range_low -= low_bound;
620 range_high -= low_bound;
621 for (; range_low <= range_high; range_low++)
623 int bit_index = (unsigned) range_low % TARGET_CHAR_BIT;
625 bit_index = TARGET_CHAR_BIT - 1 - bit_index;
626 valaddr[(unsigned) range_low / TARGET_CHAR_BIT]
633 argvec = (struct value **) alloca (sizeof (struct value *) * nargs);
634 for (tem = 0; tem < nargs; tem++)
636 /* Ensure that array expressions are coerced into pointer objects. */
637 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
639 if (noside == EVAL_SKIP)
641 return value_array (tem2, tem3, argvec);
645 struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside);
647 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
649 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
650 if (noside == EVAL_SKIP)
652 return value_slice (array, lowbound, upper - lowbound + 1);
655 case TERNOP_SLICE_COUNT:
657 struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside);
659 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
661 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
662 return value_slice (array, lowbound, length);
666 /* Skip third and second args to evaluate the first one. */
667 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
668 if (value_logical_not (arg1))
670 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
671 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
675 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
676 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
680 case OP_OBJC_SELECTOR:
681 { /* Objective C @selector operator. */
682 char *sel = &exp->elts[pc + 2].string;
683 int len = longest_to_int (exp->elts[pc + 1].longconst);
685 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
686 if (noside == EVAL_SKIP)
690 sel[len] = 0; /* Make sure it's terminated. */
691 return value_from_longest (lookup_pointer_type (builtin_type_void),
692 lookup_child_selector (sel));
695 case OP_OBJC_MSGCALL:
696 { /* Objective C message (method) call. */
698 static CORE_ADDR responds_selector = 0;
699 static CORE_ADDR method_selector = 0;
701 CORE_ADDR selector = 0;
704 int struct_return = 0;
707 static struct value *msg_send = NULL;
708 static struct value *msg_send_stret = NULL;
709 static int gnu_runtime = 0;
711 struct value *target = NULL;
712 struct value *method = NULL;
713 struct value *called_method = NULL;
715 struct type *selector_type = NULL;
717 struct value *ret = NULL;
720 selector = exp->elts[pc + 1].longconst;
721 nargs = exp->elts[pc + 2].longconst;
722 argvec = (struct value **) alloca (sizeof (struct value *)
727 selector_type = lookup_pointer_type (builtin_type_void);
728 if (noside == EVAL_AVOID_SIDE_EFFECTS)
729 sub_no_side = EVAL_NORMAL;
731 sub_no_side = noside;
733 target = evaluate_subexp (selector_type, exp, pos, sub_no_side);
735 if (value_as_long (target) == 0)
736 return value_from_longest (builtin_type_long, 0);
738 if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0))
741 /* Find the method dispatch (Apple runtime) or method lookup
742 (GNU runtime) function for Objective-C. These will be used
743 to lookup the symbol information for the method. If we
744 can't find any symbol information, then we'll use these to
745 call the method, otherwise we can call the method
746 directly. The msg_send_stret function is used in the special
747 case of a method that returns a structure (Apple runtime
752 type = lookup_pointer_type (builtin_type_void);
753 type = lookup_function_type (type);
754 type = lookup_pointer_type (type);
755 type = lookup_function_type (type);
756 type = lookup_pointer_type (type);
758 msg_send = find_function_in_inferior ("objc_msg_lookup");
759 msg_send_stret = find_function_in_inferior ("objc_msg_lookup");
761 msg_send = value_from_pointer (type, value_as_address (msg_send));
762 msg_send_stret = value_from_pointer (type,
763 value_as_address (msg_send_stret));
767 msg_send = find_function_in_inferior ("objc_msgSend");
768 /* Special dispatcher for methods returning structs */
769 msg_send_stret = find_function_in_inferior ("objc_msgSend_stret");
772 /* Verify the target object responds to this method. The
773 standard top-level 'Object' class uses a different name for
774 the verification method than the non-standard, but more
775 often used, 'NSObject' class. Make sure we check for both. */
777 responds_selector = lookup_child_selector ("respondsToSelector:");
778 if (responds_selector == 0)
779 responds_selector = lookup_child_selector ("respondsTo:");
781 if (responds_selector == 0)
782 error (_("no 'respondsTo:' or 'respondsToSelector:' method"));
784 method_selector = lookup_child_selector ("methodForSelector:");
785 if (method_selector == 0)
786 method_selector = lookup_child_selector ("methodFor:");
788 if (method_selector == 0)
789 error (_("no 'methodFor:' or 'methodForSelector:' method"));
791 /* Call the verification method, to make sure that the target
792 class implements the desired method. */
794 argvec[0] = msg_send;
796 argvec[2] = value_from_longest (builtin_type_long, responds_selector);
797 argvec[3] = value_from_longest (builtin_type_long, selector);
800 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
803 /* Function objc_msg_lookup returns a pointer. */
805 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
807 if (value_as_long (ret) == 0)
808 error (_("Target does not respond to this message selector."));
810 /* Call "methodForSelector:" method, to get the address of a
811 function method that implements this selector for this
812 class. If we can find a symbol at that address, then we
813 know the return type, parameter types etc. (that's a good
816 argvec[0] = msg_send;
818 argvec[2] = value_from_longest (builtin_type_long, method_selector);
819 argvec[3] = value_from_longest (builtin_type_long, selector);
822 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
826 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
829 /* ret should now be the selector. */
831 addr = value_as_long (ret);
834 struct symbol *sym = NULL;
835 /* Is it a high_level symbol? */
837 sym = find_pc_function (addr);
839 method = value_of_variable (sym, 0);
842 /* If we found a method with symbol information, check to see
843 if it returns a struct. Otherwise assume it doesn't. */
849 struct type *value_type;
851 funaddr = find_function_addr (method, &value_type);
853 b = block_for_pc (funaddr);
855 /* If compiled without -g, assume GCC 2. */
856 using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b));
858 CHECK_TYPEDEF (value_type);
860 if ((value_type == NULL)
861 || (TYPE_CODE(value_type) == TYPE_CODE_ERROR))
863 if (expect_type != NULL)
864 value_type = expect_type;
867 struct_return = using_struct_return (value_type, using_gcc);
869 else if (expect_type != NULL)
871 struct_return = using_struct_return (check_typedef (expect_type), using_gcc);
874 /* Found a function symbol. Now we will substitute its
875 value in place of the message dispatcher (obj_msgSend),
876 so that we call the method directly instead of thru
877 the dispatcher. The main reason for doing this is that
878 we can now evaluate the return value and parameter values
879 according to their known data types, in case we need to
880 do things like promotion, dereferencing, special handling
881 of structs and doubles, etc.
883 We want to use the type signature of 'method', but still
884 jump to objc_msgSend() or objc_msgSend_stret() to better
885 mimic the behavior of the runtime. */
889 if (TYPE_CODE (value_type (method)) != TYPE_CODE_FUNC)
890 error (_("method address has symbol information with non-function type; skipping"));
892 VALUE_ADDRESS (method) = value_as_address (msg_send_stret);
894 VALUE_ADDRESS (method) = value_as_address (msg_send);
895 called_method = method;
900 called_method = msg_send_stret;
902 called_method = msg_send;
905 if (noside == EVAL_SKIP)
908 if (noside == EVAL_AVOID_SIDE_EFFECTS)
910 /* If the return type doesn't look like a function type,
911 call an error. This can happen if somebody tries to
912 turn a variable into a function call. This is here
913 because people often want to call, eg, strcmp, which
914 gdb doesn't know is a function. If gdb isn't asked for
915 it's opinion (ie. through "whatis"), it won't offer
918 struct type *type = value_type (called_method);
919 if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
920 type = TYPE_TARGET_TYPE (type);
921 type = TYPE_TARGET_TYPE (type);
925 if ((TYPE_CODE (type) == TYPE_CODE_ERROR) && expect_type)
926 return allocate_value (expect_type);
928 return allocate_value (type);
931 error (_("Expression of type other than \"method returning ...\" used as a method"));
934 /* Now depending on whether we found a symbol for the method,
935 we will either call the runtime dispatcher or the method
938 argvec[0] = called_method;
940 argvec[2] = value_from_longest (builtin_type_long, selector);
941 /* User-supplied arguments. */
942 for (tem = 0; tem < nargs; tem++)
943 argvec[tem + 3] = evaluate_subexp_with_coercion (exp, pos, noside);
946 if (gnu_runtime && (method != NULL))
948 /* Function objc_msg_lookup returns a pointer. */
949 deprecated_set_value_type (argvec[0],
950 lookup_function_type (lookup_pointer_type (value_type (argvec[0]))));
951 argvec[0] = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
954 ret = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
961 op = exp->elts[*pos].opcode;
962 nargs = longest_to_int (exp->elts[pc + 1].longconst);
963 /* Allocate arg vector, including space for the function to be
964 called in argvec[0] and a terminating NULL */
965 argvec = (struct value **) alloca (sizeof (struct value *) * (nargs + 3));
966 if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
970 /* 1997-08-01 Currently we do not support function invocation
971 via pointers-to-methods with HP aCC. Pointer does not point
972 to the function, but possibly to some thunk. */
973 if (deprecated_hp_som_som_object_present)
975 error (_("Not implemented: function invocation through pointer to method with HP aCC"));
979 /* First, evaluate the structure into arg2 */
982 if (noside == EVAL_SKIP)
985 if (op == STRUCTOP_MEMBER)
987 arg2 = evaluate_subexp_for_address (exp, pos, noside);
991 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
994 /* If the function is a virtual function, then the
995 aggregate value (providing the structure) plays
996 its part by providing the vtable. Otherwise,
997 it is just along for the ride: call the function
1000 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1002 fnptr = value_as_long (arg1);
1004 if (METHOD_PTR_IS_VIRTUAL (fnptr))
1006 int fnoffset = METHOD_PTR_TO_VOFFSET (fnptr);
1007 struct type *basetype;
1008 struct type *domain_type =
1009 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (value_type (arg1)));
1011 basetype = TYPE_TARGET_TYPE (value_type (arg2));
1012 if (domain_type != basetype)
1013 arg2 = value_cast (lookup_pointer_type (domain_type), arg2);
1014 basetype = TYPE_VPTR_BASETYPE (domain_type);
1015 for (i = TYPE_NFN_FIELDS (basetype) - 1; i >= 0; i--)
1017 struct fn_field *f = TYPE_FN_FIELDLIST1 (basetype, i);
1018 /* If one is virtual, then all are virtual. */
1019 if (TYPE_FN_FIELD_VIRTUAL_P (f, 0))
1020 for (j = TYPE_FN_FIELDLIST_LENGTH (basetype, i) - 1; j >= 0; --j)
1021 if ((int) TYPE_FN_FIELD_VOFFSET (f, j) == fnoffset)
1023 struct value *temp = value_ind (arg2);
1024 arg1 = value_virtual_fn_field (&temp, f, j, domain_type, 0);
1025 arg2 = value_addr (temp);
1030 error (_("virtual function at index %d not found"), fnoffset);
1034 deprecated_set_value_type (arg1, lookup_pointer_type (TYPE_TARGET_TYPE (value_type (arg1))));
1038 /* Now, say which argument to start evaluating from */
1041 else if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
1043 /* Hair for method invocations */
1047 /* First, evaluate the structure into arg2 */
1049 tem2 = longest_to_int (exp->elts[pc2 + 1].longconst);
1050 *pos += 3 + BYTES_TO_EXP_ELEM (tem2 + 1);
1051 if (noside == EVAL_SKIP)
1054 if (op == STRUCTOP_STRUCT)
1056 /* If v is a variable in a register, and the user types
1057 v.method (), this will produce an error, because v has
1060 A possible way around this would be to allocate a
1061 copy of the variable on the stack, copy in the
1062 contents, call the function, and copy out the
1063 contents. I.e. convert this from call by reference
1064 to call by copy-return (or whatever it's called).
1065 However, this does not work because it is not the
1066 same: the method being called could stash a copy of
1067 the address, and then future uses through that address
1068 (after the method returns) would be expected to
1069 use the variable itself, not some copy of it. */
1070 arg2 = evaluate_subexp_for_address (exp, pos, noside);
1074 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1076 /* Now, say which argument to start evaluating from */
1081 /* Non-method function call */
1083 argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside);
1085 type = value_type (argvec[0]);
1086 if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
1087 type = TYPE_TARGET_TYPE (type);
1088 if (type && TYPE_CODE (type) == TYPE_CODE_FUNC)
1090 for (; tem <= nargs && tem <= TYPE_NFIELDS (type); tem++)
1092 /* pai: FIXME This seems to be coercing arguments before
1093 * overload resolution has been done! */
1094 argvec[tem] = evaluate_subexp (TYPE_FIELD_TYPE (type, tem - 1),
1100 /* Evaluate arguments */
1101 for (; tem <= nargs; tem++)
1103 /* Ensure that array expressions are coerced into pointer objects. */
1104 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
1107 /* signal end of arglist */
1110 if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
1112 int static_memfuncp;
1115 /* Method invocation : stuff "this" as first parameter */
1117 /* Name of method from expression */
1118 strcpy (tstr, &exp->elts[pc2 + 2].string);
1120 if (overload_resolution && (exp->language_defn->la_language == language_cplus))
1122 /* Language is C++, do some overload resolution before evaluation */
1123 struct value *valp = NULL;
1125 /* Prepare list of argument types for overload resolution */
1126 arg_types = (struct type **) alloca (nargs * (sizeof (struct type *)));
1127 for (ix = 1; ix <= nargs; ix++)
1128 arg_types[ix - 1] = value_type (argvec[ix]);
1130 (void) find_overload_match (arg_types, nargs, tstr,
1131 1 /* method */ , 0 /* strict match */ ,
1132 &arg2 /* the object */ , NULL,
1133 &valp, NULL, &static_memfuncp);
1136 argvec[1] = arg2; /* the ``this'' pointer */
1137 argvec[0] = valp; /* use the method found after overload resolution */
1140 /* Non-C++ case -- or no overload resolution */
1142 struct value *temp = arg2;
1143 argvec[0] = value_struct_elt (&temp, argvec + 1, tstr,
1145 op == STRUCTOP_STRUCT
1146 ? "structure" : "structure pointer");
1147 /* value_struct_elt updates temp with the correct value
1148 of the ``this'' pointer if necessary, so modify argvec[1] to
1149 reflect any ``this'' changes. */
1150 arg2 = value_from_longest (lookup_pointer_type(value_type (temp)),
1151 VALUE_ADDRESS (temp) + value_offset (temp)
1152 + value_embedded_offset (temp));
1153 argvec[1] = arg2; /* the ``this'' pointer */
1156 if (static_memfuncp)
1158 argvec[1] = argvec[0];
1163 else if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
1168 else if (op == OP_VAR_VALUE)
1170 /* Non-member function being called */
1171 /* fn: This can only be done for C++ functions. A C-style function
1172 in a C++ program, for instance, does not have the fields that
1173 are expected here */
1175 if (overload_resolution && (exp->language_defn->la_language == language_cplus))
1177 /* Language is C++, do some overload resolution before evaluation */
1178 struct symbol *symp;
1180 /* Prepare list of argument types for overload resolution */
1181 arg_types = (struct type **) alloca (nargs * (sizeof (struct type *)));
1182 for (ix = 1; ix <= nargs; ix++)
1183 arg_types[ix - 1] = value_type (argvec[ix]);
1185 (void) find_overload_match (arg_types, nargs, NULL /* no need for name */ ,
1186 0 /* not method */ , 0 /* strict match */ ,
1187 NULL, exp->elts[save_pos1+2].symbol /* the function */ ,
1190 /* Now fix the expression being evaluated */
1191 exp->elts[save_pos1+2].symbol = symp;
1192 argvec[0] = evaluate_subexp_with_coercion (exp, &save_pos1, noside);
1196 /* Not C++, or no overload resolution allowed */
1197 /* nothing to be done; argvec already correctly set up */
1202 /* It is probably a C-style function */
1203 /* nothing to be done; argvec already correctly set up */
1208 if (noside == EVAL_SKIP)
1210 if (argvec[0] == NULL)
1211 error (_("Cannot evaluate function -- may be inlined"));
1212 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1214 /* If the return type doesn't look like a function type, call an
1215 error. This can happen if somebody tries to turn a variable into
1216 a function call. This is here because people often want to
1217 call, eg, strcmp, which gdb doesn't know is a function. If
1218 gdb isn't asked for it's opinion (ie. through "whatis"),
1219 it won't offer it. */
1221 struct type *ftype =
1222 TYPE_TARGET_TYPE (value_type (argvec[0]));
1225 return allocate_value (TYPE_TARGET_TYPE (value_type (argvec[0])));
1227 error (_("Expression of type other than \"Function returning ...\" used as function"));
1229 return call_function_by_hand (argvec[0], nargs, argvec + 1);
1230 /* pai: FIXME save value from call_function_by_hand, then adjust pc by adjust_fn_pc if +ve */
1232 case OP_F77_UNDETERMINED_ARGLIST:
1234 /* Remember that in F77, functions, substring ops and
1235 array subscript operations cannot be disambiguated
1236 at parse time. We have made all array subscript operations,
1237 substring operations as well as function calls come here
1238 and we now have to discover what the heck this thing actually was.
1239 If it is a function, we process just as if we got an OP_FUNCALL. */
1241 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1244 /* First determine the type code we are dealing with. */
1245 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1246 type = check_typedef (value_type (arg1));
1247 code = TYPE_CODE (type);
1251 case TYPE_CODE_ARRAY:
1252 goto multi_f77_subscript;
1254 case TYPE_CODE_STRING:
1258 case TYPE_CODE_FUNC:
1259 /* It's a function call. */
1260 /* Allocate arg vector, including space for the function to be
1261 called in argvec[0] and a terminating NULL */
1262 argvec = (struct value **) alloca (sizeof (struct value *) * (nargs + 2));
1265 for (; tem <= nargs; tem++)
1266 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
1267 argvec[tem] = 0; /* signal end of arglist */
1271 error (_("Cannot perform substring on this type"));
1275 /* We have a substring operation on our hands here,
1276 let us get the string we will be dealing with */
1278 /* Now evaluate the 'from' and 'to' */
1280 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1283 return value_subscript (arg1, arg2);
1285 arg3 = evaluate_subexp_with_coercion (exp, pos, noside);
1287 if (noside == EVAL_SKIP)
1290 tem2 = value_as_long (arg2);
1291 tem3 = value_as_long (arg3);
1293 return value_slice (arg1, tem2, tem3 - tem2 + 1);
1296 /* We have a complex number, There should be 2 floating
1297 point numbers that compose it */
1298 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1299 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1301 return value_literal_complex (arg1, arg2, builtin_type_f_complex_s16);
1303 case STRUCTOP_STRUCT:
1304 tem = longest_to_int (exp->elts[pc + 1].longconst);
1305 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
1306 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1307 if (noside == EVAL_SKIP)
1309 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1310 return value_zero (lookup_struct_elt_type (value_type (arg1),
1311 &exp->elts[pc + 2].string,
1316 struct value *temp = arg1;
1317 return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
1322 tem = longest_to_int (exp->elts[pc + 1].longconst);
1323 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
1324 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1325 if (noside == EVAL_SKIP)
1328 /* JYG: if print object is on we need to replace the base type
1329 with rtti type in order to continue on with successful
1330 lookup of member / method only available in the rtti type. */
1332 struct type *type = value_type (arg1);
1333 struct type *real_type;
1334 int full, top, using_enc;
1336 if (objectprint && TYPE_TARGET_TYPE(type) &&
1337 (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
1339 real_type = value_rtti_target_type (arg1, &full, &top, &using_enc);
1342 if (TYPE_CODE (type) == TYPE_CODE_PTR)
1343 real_type = lookup_pointer_type (real_type);
1345 real_type = lookup_reference_type (real_type);
1347 arg1 = value_cast (real_type, arg1);
1352 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1353 return value_zero (lookup_struct_elt_type (value_type (arg1),
1354 &exp->elts[pc + 2].string,
1359 struct value *temp = arg1;
1360 return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
1361 NULL, "structure pointer");
1364 case STRUCTOP_MEMBER:
1365 arg1 = evaluate_subexp_for_address (exp, pos, noside);
1366 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1368 /* With HP aCC, pointers to methods do not point to the function code */
1369 if (deprecated_hp_som_som_object_present &&
1370 (TYPE_CODE (value_type (arg2)) == TYPE_CODE_PTR) &&
1371 (TYPE_CODE (TYPE_TARGET_TYPE (value_type (arg2))) == TYPE_CODE_METHOD))
1372 error (_("Pointers to methods not supported with HP aCC")); /* 1997-08-19 */
1374 mem_offset = value_as_long (arg2);
1375 goto handle_pointer_to_member;
1378 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1379 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1381 /* With HP aCC, pointers to methods do not point to the function code */
1382 if (deprecated_hp_som_som_object_present &&
1383 (TYPE_CODE (value_type (arg2)) == TYPE_CODE_PTR) &&
1384 (TYPE_CODE (TYPE_TARGET_TYPE (value_type (arg2))) == TYPE_CODE_METHOD))
1385 error (_("Pointers to methods not supported with HP aCC")); /* 1997-08-19 */
1387 mem_offset = value_as_long (arg2);
1389 handle_pointer_to_member:
1390 /* HP aCC generates offsets that have bit #29 set; turn it off to get
1391 a real offset to the member. */
1392 if (deprecated_hp_som_som_object_present)
1394 if (!mem_offset) /* no bias -> really null */
1395 error (_("Attempted dereference of null pointer-to-member"));
1396 mem_offset &= ~0x20000000;
1398 if (noside == EVAL_SKIP)
1400 type = check_typedef (value_type (arg2));
1401 if (TYPE_CODE (type) != TYPE_CODE_PTR)
1402 goto bad_pointer_to_member;
1403 type = check_typedef (TYPE_TARGET_TYPE (type));
1404 if (TYPE_CODE (type) == TYPE_CODE_METHOD)
1405 error (_("not implemented: pointer-to-method in pointer-to-member construct"));
1406 if (TYPE_CODE (type) != TYPE_CODE_MEMBER)
1407 goto bad_pointer_to_member;
1408 /* Now, convert these values to an address. */
1409 arg1 = value_cast (lookup_pointer_type (TYPE_DOMAIN_TYPE (type)),
1411 arg3 = value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
1412 value_as_long (arg1) + mem_offset);
1413 return value_ind (arg3);
1414 bad_pointer_to_member:
1415 error (_("non-pointer-to-member value used in pointer-to-member construct"));
1418 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1419 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1420 if (noside == EVAL_SKIP)
1422 if (binop_user_defined_p (op, arg1, arg2))
1423 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1425 return value_concat (arg1, arg2);
1428 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1429 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1431 /* Do special stuff for HP aCC pointers to members */
1432 if (deprecated_hp_som_som_object_present)
1434 /* 1997-08-19 Can't assign HP aCC pointers to methods. No details of
1435 the implementation yet; but the pointer appears to point to a code
1436 sequence (thunk) in memory -- in any case it is *not* the address
1437 of the function as it would be in a naive implementation. */
1438 if ((TYPE_CODE (value_type (arg1)) == TYPE_CODE_PTR) &&
1439 (TYPE_CODE (TYPE_TARGET_TYPE (value_type (arg1))) == TYPE_CODE_METHOD))
1440 error (_("Assignment to pointers to methods not implemented with HP aCC"));
1442 /* HP aCC pointers to data members require a constant bias */
1443 if ((TYPE_CODE (value_type (arg1)) == TYPE_CODE_PTR) &&
1444 (TYPE_CODE (TYPE_TARGET_TYPE (value_type (arg1))) == TYPE_CODE_MEMBER))
1446 unsigned int *ptr = (unsigned int *) value_contents (arg2); /* forces evaluation */
1447 *ptr |= 0x20000000; /* set 29th bit */
1451 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1453 if (binop_user_defined_p (op, arg1, arg2))
1454 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1456 return value_assign (arg1, arg2);
1458 case BINOP_ASSIGN_MODIFY:
1460 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1461 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1462 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1464 op = exp->elts[pc + 1].opcode;
1465 if (binop_user_defined_p (op, arg1, arg2))
1466 return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op, noside);
1467 else if (op == BINOP_ADD)
1468 arg2 = value_add (arg1, arg2);
1469 else if (op == BINOP_SUB)
1470 arg2 = value_sub (arg1, arg2);
1472 arg2 = value_binop (arg1, arg2, op);
1473 return value_assign (arg1, arg2);
1476 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1477 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1478 if (noside == EVAL_SKIP)
1480 if (binop_user_defined_p (op, arg1, arg2))
1481 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1483 return value_add (arg1, arg2);
1486 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1487 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1488 if (noside == EVAL_SKIP)
1490 if (binop_user_defined_p (op, arg1, arg2))
1491 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1493 return value_sub (arg1, arg2);
1501 case BINOP_BITWISE_AND:
1502 case BINOP_BITWISE_IOR:
1503 case BINOP_BITWISE_XOR:
1504 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1505 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1506 if (noside == EVAL_SKIP)
1508 if (binop_user_defined_p (op, arg1, arg2))
1509 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1510 else if (noside == EVAL_AVOID_SIDE_EFFECTS
1511 && (op == BINOP_DIV || op == BINOP_REM || op == BINOP_MOD))
1512 return value_zero (value_type (arg1), not_lval);
1514 return value_binop (arg1, arg2, op);
1517 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1518 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1519 if (noside == EVAL_SKIP)
1521 error (_("':' operator used in invalid context"));
1523 case BINOP_SUBSCRIPT:
1524 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1525 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1526 if (noside == EVAL_SKIP)
1528 if (binop_user_defined_p (op, arg1, arg2))
1529 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1532 /* If the user attempts to subscript something that is not an
1533 array or pointer type (like a plain int variable for example),
1534 then report this as an error. */
1536 arg1 = coerce_ref (arg1);
1537 type = check_typedef (value_type (arg1));
1538 if (TYPE_CODE (type) != TYPE_CODE_ARRAY
1539 && TYPE_CODE (type) != TYPE_CODE_PTR)
1541 if (TYPE_NAME (type))
1542 error (_("cannot subscript something of type `%s'"),
1545 error (_("cannot subscript requested type"));
1548 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1549 return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
1551 return value_subscript (arg1, arg2);
1555 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1556 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1557 if (noside == EVAL_SKIP)
1559 return value_in (arg1, arg2);
1561 case MULTI_SUBSCRIPT:
1563 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1564 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1567 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1568 /* FIXME: EVAL_SKIP handling may not be correct. */
1569 if (noside == EVAL_SKIP)
1580 /* FIXME: EVAL_AVOID_SIDE_EFFECTS handling may not be correct. */
1581 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1583 /* If the user attempts to subscript something that has no target
1584 type (like a plain int variable for example), then report this
1587 type = TYPE_TARGET_TYPE (check_typedef (value_type (arg1)));
1590 arg1 = value_zero (type, VALUE_LVAL (arg1));
1596 error (_("cannot subscript something of type `%s'"),
1597 TYPE_NAME (value_type (arg1)));
1601 if (binop_user_defined_p (op, arg1, arg2))
1603 arg1 = value_x_binop (arg1, arg2, op, OP_NULL, noside);
1607 arg1 = value_subscript (arg1, arg2);
1612 multi_f77_subscript:
1614 int subscript_array[MAX_FORTRAN_DIMS];
1615 int array_size_array[MAX_FORTRAN_DIMS];
1616 int ndimensions = 1, i;
1617 struct type *tmp_type;
1618 int offset_item; /* The array offset where the item lives */
1620 if (nargs > MAX_FORTRAN_DIMS)
1621 error (_("Too many subscripts for F77 (%d Max)"), MAX_FORTRAN_DIMS);
1623 tmp_type = check_typedef (value_type (arg1));
1624 ndimensions = calc_f77_array_dims (type);
1626 if (nargs != ndimensions)
1627 error (_("Wrong number of subscripts"));
1629 /* Now that we know we have a legal array subscript expression
1630 let us actually find out where this element exists in the array. */
1633 /* Take array indices left to right */
1634 for (i = 0; i < nargs; i++)
1636 /* Evaluate each subscript, It must be a legal integer in F77 */
1637 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1639 /* Fill in the subscript and array size arrays */
1641 subscript_array[i] = value_as_long (arg2);
1644 /* Internal type of array is arranged right to left */
1645 for (i = 0; i < nargs; i++)
1647 retcode = f77_get_dynamic_upperbound (tmp_type, &upper);
1648 if (retcode == BOUND_FETCH_ERROR)
1649 error (_("Cannot obtain dynamic upper bound"));
1651 retcode = f77_get_dynamic_lowerbound (tmp_type, &lower);
1652 if (retcode == BOUND_FETCH_ERROR)
1653 error (_("Cannot obtain dynamic lower bound"));
1655 array_size_array[nargs - i - 1] = upper - lower + 1;
1657 /* Zero-normalize subscripts so that offsetting will work. */
1659 subscript_array[nargs - i - 1] -= lower;
1661 /* If we are at the bottom of a multidimensional
1662 array type then keep a ptr to the last ARRAY
1663 type around for use when calling value_subscript()
1664 below. This is done because we pretend to value_subscript
1665 that we actually have a one-dimensional array
1666 of base element type that we apply a simple
1670 tmp_type = check_typedef (TYPE_TARGET_TYPE (tmp_type));
1673 /* Now let us calculate the offset for this item */
1675 offset_item = subscript_array[ndimensions - 1];
1677 for (i = ndimensions - 1; i > 0; --i)
1679 array_size_array[i - 1] * offset_item + subscript_array[i - 1];
1681 /* Construct a value node with the value of the offset */
1683 arg2 = value_from_longest (builtin_type_f_integer, offset_item);
1685 /* Let us now play a dirty trick: we will take arg1
1686 which is a value node pointing to the topmost level
1687 of the multidimensional array-set and pretend
1688 that it is actually a array of the final element
1689 type, this will ensure that value_subscript()
1690 returns the correct type value */
1692 deprecated_set_value_type (arg1, tmp_type);
1693 return value_ind (value_add (value_coerce_array (arg1), arg2));
1696 case BINOP_LOGICAL_AND:
1697 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1698 if (noside == EVAL_SKIP)
1700 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1705 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1708 if (binop_user_defined_p (op, arg1, arg2))
1710 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1711 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1715 tem = value_logical_not (arg1);
1716 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
1717 (tem ? EVAL_SKIP : noside));
1718 return value_from_longest (LA_BOOL_TYPE,
1719 (LONGEST) (!tem && !value_logical_not (arg2)));
1722 case BINOP_LOGICAL_OR:
1723 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1724 if (noside == EVAL_SKIP)
1726 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1731 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1734 if (binop_user_defined_p (op, arg1, arg2))
1736 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1737 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1741 tem = value_logical_not (arg1);
1742 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
1743 (!tem ? EVAL_SKIP : noside));
1744 return value_from_longest (LA_BOOL_TYPE,
1745 (LONGEST) (!tem || !value_logical_not (arg2)));
1749 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1750 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1751 if (noside == EVAL_SKIP)
1753 if (binop_user_defined_p (op, arg1, arg2))
1755 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1759 tem = value_equal (arg1, arg2);
1760 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1763 case BINOP_NOTEQUAL:
1764 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1765 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1766 if (noside == EVAL_SKIP)
1768 if (binop_user_defined_p (op, arg1, arg2))
1770 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1774 tem = value_equal (arg1, arg2);
1775 return value_from_longest (LA_BOOL_TYPE, (LONGEST) ! tem);
1779 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1780 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1781 if (noside == EVAL_SKIP)
1783 if (binop_user_defined_p (op, arg1, arg2))
1785 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1789 tem = value_less (arg1, arg2);
1790 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1794 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1795 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1796 if (noside == EVAL_SKIP)
1798 if (binop_user_defined_p (op, arg1, arg2))
1800 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1804 tem = value_less (arg2, arg1);
1805 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1809 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1810 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1811 if (noside == EVAL_SKIP)
1813 if (binop_user_defined_p (op, arg1, arg2))
1815 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1819 tem = value_less (arg2, arg1) || value_equal (arg1, arg2);
1820 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1824 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1825 arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
1826 if (noside == EVAL_SKIP)
1828 if (binop_user_defined_p (op, arg1, arg2))
1830 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1834 tem = value_less (arg1, arg2) || value_equal (arg1, arg2);
1835 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1839 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1840 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1841 if (noside == EVAL_SKIP)
1843 type = check_typedef (value_type (arg2));
1844 if (TYPE_CODE (type) != TYPE_CODE_INT)
1845 error (_("Non-integral right operand for \"@\" operator."));
1846 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1848 return allocate_repeat_value (value_type (arg1),
1849 longest_to_int (value_as_long (arg2)));
1852 return value_repeat (arg1, longest_to_int (value_as_long (arg2)));
1855 evaluate_subexp (NULL_TYPE, exp, pos, noside);
1856 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
1859 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1860 if (noside == EVAL_SKIP)
1862 if (unop_user_defined_p (op, arg1))
1863 return value_x_unop (arg1, op, noside);
1865 return value_pos (arg1);
1868 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1869 if (noside == EVAL_SKIP)
1871 if (unop_user_defined_p (op, arg1))
1872 return value_x_unop (arg1, op, noside);
1874 return value_neg (arg1);
1876 case UNOP_COMPLEMENT:
1877 /* C++: check for and handle destructor names. */
1878 op = exp->elts[*pos].opcode;
1880 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1881 if (noside == EVAL_SKIP)
1883 if (unop_user_defined_p (UNOP_COMPLEMENT, arg1))
1884 return value_x_unop (arg1, UNOP_COMPLEMENT, noside);
1886 return value_complement (arg1);
1888 case UNOP_LOGICAL_NOT:
1889 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1890 if (noside == EVAL_SKIP)
1892 if (unop_user_defined_p (op, arg1))
1893 return value_x_unop (arg1, op, noside);
1895 return value_from_longest (LA_BOOL_TYPE,
1896 (LONGEST) value_logical_not (arg1));
1899 if (expect_type && TYPE_CODE (expect_type) == TYPE_CODE_PTR)
1900 expect_type = TYPE_TARGET_TYPE (check_typedef (expect_type));
1901 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1902 if ((TYPE_TARGET_TYPE (value_type (arg1))) &&
1903 ((TYPE_CODE (TYPE_TARGET_TYPE (value_type (arg1))) == TYPE_CODE_METHOD) ||
1904 (TYPE_CODE (TYPE_TARGET_TYPE (value_type (arg1))) == TYPE_CODE_MEMBER)))
1905 error (_("Attempt to dereference pointer to member without an object"));
1906 if (noside == EVAL_SKIP)
1908 if (unop_user_defined_p (op, arg1))
1909 return value_x_unop (arg1, op, noside);
1910 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
1912 type = check_typedef (value_type (arg1));
1913 if (TYPE_CODE (type) == TYPE_CODE_PTR
1914 || TYPE_CODE (type) == TYPE_CODE_REF
1915 /* In C you can dereference an array to get the 1st elt. */
1916 || TYPE_CODE (type) == TYPE_CODE_ARRAY
1918 return value_zero (TYPE_TARGET_TYPE (type),
1920 else if (TYPE_CODE (type) == TYPE_CODE_INT)
1921 /* GDB allows dereferencing an int. */
1922 return value_zero (builtin_type_int, lval_memory);
1924 error (_("Attempt to take contents of a non-pointer value."));
1926 return value_ind (arg1);
1929 /* C++: check for and handle pointer to members. */
1931 op = exp->elts[*pos].opcode;
1933 if (noside == EVAL_SKIP)
1937 int temm = longest_to_int (exp->elts[pc + 3].longconst);
1938 (*pos) += 3 + BYTES_TO_EXP_ELEM (temm + 1);
1941 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
1946 struct value *retvalp = evaluate_subexp_for_address (exp, pos, noside);
1947 /* If HP aCC object, use bias for pointers to members */
1948 if (deprecated_hp_som_som_object_present &&
1949 (TYPE_CODE (value_type (retvalp)) == TYPE_CODE_PTR) &&
1950 (TYPE_CODE (TYPE_TARGET_TYPE (value_type (retvalp))) == TYPE_CODE_MEMBER))
1952 unsigned int *ptr = (unsigned int *) value_contents (retvalp); /* forces evaluation */
1953 *ptr |= 0x20000000; /* set 29th bit */
1959 if (noside == EVAL_SKIP)
1961 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
1964 return evaluate_subexp_for_sizeof (exp, pos);
1968 type = exp->elts[pc + 1].type;
1969 arg1 = evaluate_subexp (type, exp, pos, noside);
1970 if (noside == EVAL_SKIP)
1972 if (type != value_type (arg1))
1973 arg1 = value_cast (type, arg1);
1978 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1979 if (noside == EVAL_SKIP)
1981 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1982 return value_zero (exp->elts[pc + 1].type, lval_memory);
1984 return value_at_lazy (exp->elts[pc + 1].type,
1985 value_as_address (arg1));
1987 case UNOP_PREINCREMENT:
1988 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1989 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1991 else if (unop_user_defined_p (op, arg1))
1993 return value_x_unop (arg1, op, noside);
1997 arg2 = value_add (arg1, value_from_longest (builtin_type_char,
1999 return value_assign (arg1, arg2);
2002 case UNOP_PREDECREMENT:
2003 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2004 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2006 else if (unop_user_defined_p (op, arg1))
2008 return value_x_unop (arg1, op, noside);
2012 arg2 = value_sub (arg1, value_from_longest (builtin_type_char,
2014 return value_assign (arg1, arg2);
2017 case UNOP_POSTINCREMENT:
2018 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2019 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2021 else if (unop_user_defined_p (op, arg1))
2023 return value_x_unop (arg1, op, noside);
2027 arg2 = value_add (arg1, value_from_longest (builtin_type_char,
2029 value_assign (arg1, arg2);
2033 case UNOP_POSTDECREMENT:
2034 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2035 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2037 else if (unop_user_defined_p (op, arg1))
2039 return value_x_unop (arg1, op, noside);
2043 arg2 = value_sub (arg1, value_from_longest (builtin_type_char,
2045 value_assign (arg1, arg2);
2051 return value_of_this (1);
2055 return value_of_local ("self", 1);
2058 error (_("Attempt to use a type name as an expression"));
2061 /* Removing this case and compiling with gcc -Wall reveals that
2062 a lot of cases are hitting this case. Some of these should
2063 probably be removed from expression.h; others are legitimate
2064 expressions which are (apparently) not fully implemented.
2066 If there are any cases landing here which mean a user error,
2067 then they should be separate cases, with more descriptive
2071 GDB does not (yet) know how to evaluate that kind of expression"));
2075 return value_from_longest (builtin_type_long, (LONGEST) 1);
2078 /* Evaluate a subexpression of EXP, at index *POS,
2079 and return the address of that subexpression.
2080 Advance *POS over the subexpression.
2081 If the subexpression isn't an lvalue, get an error.
2082 NOSIDE may be EVAL_AVOID_SIDE_EFFECTS;
2083 then only the type of the result need be correct. */
2085 static struct value *
2086 evaluate_subexp_for_address (struct expression *exp, int *pos,
2094 op = exp->elts[pc].opcode;
2100 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
2104 return value_cast (lookup_pointer_type (exp->elts[pc + 1].type),
2105 evaluate_subexp (NULL_TYPE, exp, pos, noside));
2108 var = exp->elts[pc + 2].symbol;
2110 /* C++: The "address" of a reference should yield the address
2111 * of the object pointed to. Let value_addr() deal with it. */
2112 if (TYPE_CODE (SYMBOL_TYPE (var)) == TYPE_CODE_REF)
2116 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2119 lookup_pointer_type (SYMBOL_TYPE (var));
2120 enum address_class sym_class = SYMBOL_CLASS (var);
2122 if (sym_class == LOC_CONST
2123 || sym_class == LOC_CONST_BYTES
2124 || sym_class == LOC_REGISTER
2125 || sym_class == LOC_REGPARM)
2126 error (_("Attempt to take address of register or constant."));
2129 value_zero (type, not_lval);
2135 block_innermost_frame (exp->elts[pc + 1].block));
2139 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2141 struct value *x = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2142 if (VALUE_LVAL (x) == lval_memory)
2143 return value_zero (lookup_pointer_type (value_type (x)),
2146 error (_("Attempt to take address of non-lval"));
2148 return value_addr (evaluate_subexp (NULL_TYPE, exp, pos, noside));
2152 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
2153 When used in contexts where arrays will be coerced anyway, this is
2154 equivalent to `evaluate_subexp' but much faster because it avoids
2155 actually fetching array contents (perhaps obsolete now that we have
2158 Note that we currently only do the coercion for C expressions, where
2159 arrays are zero based and the coercion is correct. For other languages,
2160 with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION
2161 to decide if coercion is appropriate.
2166 evaluate_subexp_with_coercion (struct expression *exp,
2167 int *pos, enum noside noside)
2175 op = exp->elts[pc].opcode;
2180 var = exp->elts[pc + 2].symbol;
2181 if (TYPE_CODE (check_typedef (SYMBOL_TYPE (var))) == TYPE_CODE_ARRAY
2182 && CAST_IS_CONVERSION)
2187 (var, block_innermost_frame (exp->elts[pc + 1].block));
2188 return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (check_typedef (SYMBOL_TYPE (var)))),
2194 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
2198 /* Evaluate a subexpression of EXP, at index *POS,
2199 and return a value for the size of that subexpression.
2200 Advance *POS over the subexpression. */
2202 static struct value *
2203 evaluate_subexp_for_sizeof (struct expression *exp, int *pos)
2211 op = exp->elts[pc].opcode;
2215 /* This case is handled specially
2216 so that we avoid creating a value for the result type.
2217 If the result type is very big, it's desirable not to
2218 create a value unnecessarily. */
2221 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2222 type = check_typedef (value_type (val));
2223 if (TYPE_CODE (type) != TYPE_CODE_PTR
2224 && TYPE_CODE (type) != TYPE_CODE_REF
2225 && TYPE_CODE (type) != TYPE_CODE_ARRAY)
2226 error (_("Attempt to take contents of a non-pointer value."));
2227 type = check_typedef (TYPE_TARGET_TYPE (type));
2228 return value_from_longest (builtin_type_int, (LONGEST)
2229 TYPE_LENGTH (type));
2233 type = check_typedef (exp->elts[pc + 1].type);
2234 return value_from_longest (builtin_type_int,
2235 (LONGEST) TYPE_LENGTH (type));
2239 type = check_typedef (SYMBOL_TYPE (exp->elts[pc + 2].symbol));
2241 value_from_longest (builtin_type_int, (LONGEST) TYPE_LENGTH (type));
2244 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2245 return value_from_longest (builtin_type_int,
2246 (LONGEST) TYPE_LENGTH (value_type (val)));
2250 /* Parse a type expression in the string [P..P+LENGTH). */
2253 parse_and_eval_type (char *p, int length)
2255 char *tmp = (char *) alloca (length + 4);
2256 struct expression *expr;
2258 memcpy (tmp + 1, p, length);
2259 tmp[length + 1] = ')';
2260 tmp[length + 2] = '0';
2261 tmp[length + 3] = '\0';
2262 expr = parse_expression (tmp);
2263 if (expr->elts[0].opcode != UNOP_CAST)
2264 error (_("Internal error in eval_type."));
2265 return expr->elts[1].type;
2269 calc_f77_array_dims (struct type *array_type)
2272 struct type *tmp_type;
2274 if ((TYPE_CODE (array_type) != TYPE_CODE_ARRAY))
2275 error (_("Can't get dimensions for a non-array type"));
2277 tmp_type = array_type;
2279 while ((tmp_type = TYPE_TARGET_TYPE (tmp_type)))
2281 if (TYPE_CODE (tmp_type) == TYPE_CODE_ARRAY)