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 Free Software
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"
40 /* This is defined in valops.c */
41 extern int overload_resolution;
43 /* JYG: lookup rtti type of STRUCTOP_PTR when this is set to continue
44 on with successful lookup for member/method of the rtti type. */
45 extern int objectprint;
47 /* Prototypes for local functions. */
49 static struct value *evaluate_subexp_for_sizeof (struct expression *, int *);
51 static struct value *evaluate_subexp_for_address (struct expression *,
54 static struct value *evaluate_subexp (struct type *, struct expression *,
57 static char *get_label (struct expression *, int *);
59 static struct value *evaluate_struct_tuple (struct value *,
60 struct expression *, int *,
63 static LONGEST init_array_element (struct value *, struct value *,
64 struct expression *, int *, enum noside,
68 evaluate_subexp (struct type *expect_type, struct expression *exp,
69 int *pos, enum noside noside)
71 return (*exp->language_defn->la_exp_desc->evaluate_exp)
72 (expect_type, exp, pos, noside);
75 /* Parse the string EXP as a C expression, evaluate it,
76 and return the result as a number. */
79 parse_and_eval_address (char *exp)
81 struct expression *expr = parse_expression (exp);
83 struct cleanup *old_chain =
84 make_cleanup (free_current_contents, &expr);
86 addr = value_as_address (evaluate_expression (expr));
87 do_cleanups (old_chain);
91 /* Like parse_and_eval_address but takes a pointer to a char * variable
92 and advanced that variable across the characters parsed. */
95 parse_and_eval_address_1 (char **expptr)
97 struct expression *expr = parse_exp_1 (expptr, (struct block *) 0, 0);
99 struct cleanup *old_chain =
100 make_cleanup (free_current_contents, &expr);
102 addr = value_as_address (evaluate_expression (expr));
103 do_cleanups (old_chain);
107 /* Like parse_and_eval_address, but treats the value of the expression
108 as an integer, not an address, returns a LONGEST, not a CORE_ADDR */
110 parse_and_eval_long (char *exp)
112 struct expression *expr = parse_expression (exp);
114 struct cleanup *old_chain =
115 make_cleanup (free_current_contents, &expr);
117 retval = value_as_long (evaluate_expression (expr));
118 do_cleanups (old_chain);
123 parse_and_eval (char *exp)
125 struct expression *expr = parse_expression (exp);
127 struct cleanup *old_chain =
128 make_cleanup (free_current_contents, &expr);
130 val = evaluate_expression (expr);
131 do_cleanups (old_chain);
135 /* Parse up to a comma (or to a closeparen)
136 in the string EXPP as an expression, evaluate it, and return the value.
137 EXPP is advanced to point to the comma. */
140 parse_to_comma_and_eval (char **expp)
142 struct expression *expr = parse_exp_1 (expp, (struct block *) 0, 1);
144 struct cleanup *old_chain =
145 make_cleanup (free_current_contents, &expr);
147 val = evaluate_expression (expr);
148 do_cleanups (old_chain);
152 /* Evaluate an expression in internal prefix form
153 such as is constructed by parse.y.
155 See expression.h for info on the format of an expression. */
158 evaluate_expression (struct expression *exp)
161 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL);
164 /* Evaluate an expression, avoiding all memory references
165 and getting a value whose type alone is correct. */
168 evaluate_type (struct expression *exp)
171 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
174 /* If the next expression is an OP_LABELED, skips past it,
175 returning the label. Otherwise, does nothing and returns NULL. */
178 get_label (struct expression *exp, int *pos)
180 if (exp->elts[*pos].opcode == OP_LABELED)
183 char *name = &exp->elts[pc + 2].string;
184 int tem = longest_to_int (exp->elts[pc + 1].longconst);
185 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
192 /* This function evaluates tuples (in (the deleted) Chill) or
193 brace-initializers (in C/C++) for structure types. */
195 static struct value *
196 evaluate_struct_tuple (struct value *struct_val,
197 struct expression *exp,
198 int *pos, enum noside noside, int nargs)
200 struct type *struct_type = check_typedef (VALUE_TYPE (struct_val));
201 struct type *substruct_type = struct_type;
202 struct type *field_type;
209 struct value *val = NULL;
214 /* Skip past the labels, and count them. */
215 while (get_label (exp, pos) != NULL)
220 char *label = get_label (exp, &pc);
223 for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
226 char *field_name = TYPE_FIELD_NAME (struct_type, fieldno);
227 if (field_name != NULL && DEPRECATED_STREQ (field_name, label))
230 subfieldno = fieldno;
231 substruct_type = struct_type;
235 for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
238 char *field_name = TYPE_FIELD_NAME (struct_type, fieldno);
239 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
240 if ((field_name == 0 || *field_name == '\0')
241 && TYPE_CODE (field_type) == TYPE_CODE_UNION)
244 for (; variantno < TYPE_NFIELDS (field_type);
248 = TYPE_FIELD_TYPE (field_type, variantno);
249 if (TYPE_CODE (substruct_type) == TYPE_CODE_STRUCT)
252 subfieldno < TYPE_NFIELDS (substruct_type);
255 if (DEPRECATED_STREQ (TYPE_FIELD_NAME (substruct_type,
266 error ("there is no field named %s", label);
272 /* Unlabelled tuple element - go to next field. */
276 if (subfieldno >= TYPE_NFIELDS (substruct_type))
279 substruct_type = struct_type;
285 subfieldno = fieldno;
286 if (fieldno >= TYPE_NFIELDS (struct_type))
287 error ("too many initializers");
288 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
289 if (TYPE_CODE (field_type) == TYPE_CODE_UNION
290 && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0')
291 error ("don't know which variant you want to set");
295 /* Here, struct_type is the type of the inner struct,
296 while substruct_type is the type of the inner struct.
297 These are the same for normal structures, but a variant struct
298 contains anonymous union fields that contain substruct fields.
299 The value fieldno is the index of the top-level (normal or
300 anonymous union) field in struct_field, while the value
301 subfieldno is the index of the actual real (named inner) field
302 in substruct_type. */
304 field_type = TYPE_FIELD_TYPE (substruct_type, subfieldno);
306 val = evaluate_subexp (field_type, exp, pos, noside);
308 /* Now actually set the field in struct_val. */
310 /* Assign val to field fieldno. */
311 if (VALUE_TYPE (val) != field_type)
312 val = value_cast (field_type, val);
314 bitsize = TYPE_FIELD_BITSIZE (substruct_type, subfieldno);
315 bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno);
317 bitpos += TYPE_FIELD_BITPOS (substruct_type, subfieldno);
318 addr = VALUE_CONTENTS (struct_val) + bitpos / 8;
320 modify_field (addr, value_as_long (val),
321 bitpos % 8, bitsize);
323 memcpy (addr, VALUE_CONTENTS (val),
324 TYPE_LENGTH (VALUE_TYPE (val)));
326 while (--nlabels > 0);
331 /* Recursive helper function for setting elements of array tuples for
332 (the deleted) Chill. The target is ARRAY (which has bounds
333 LOW_BOUND to HIGH_BOUND); the element value is ELEMENT; EXP, POS
334 and NOSIDE are as usual. Evaluates index expresions and sets the
335 specified element(s) of ARRAY to ELEMENT. Returns last index
339 init_array_element (struct value *array, struct value *element,
340 struct expression *exp, int *pos,
341 enum noside noside, LONGEST low_bound, LONGEST high_bound)
344 int element_size = TYPE_LENGTH (VALUE_TYPE (element));
345 if (exp->elts[*pos].opcode == BINOP_COMMA)
348 init_array_element (array, element, exp, pos, noside,
349 low_bound, high_bound);
350 return init_array_element (array, element,
351 exp, pos, noside, low_bound, high_bound);
353 else if (exp->elts[*pos].opcode == BINOP_RANGE)
357 low = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
358 high = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
359 if (low < low_bound || high > high_bound)
360 error ("tuple range index out of range");
361 for (index = low; index <= high; index++)
363 memcpy (VALUE_CONTENTS_RAW (array)
364 + (index - low_bound) * element_size,
365 VALUE_CONTENTS (element), element_size);
370 index = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
371 if (index < low_bound || index > high_bound)
372 error ("tuple index out of range");
373 memcpy (VALUE_CONTENTS_RAW (array) + (index - low_bound) * element_size,
374 VALUE_CONTENTS (element), element_size);
380 evaluate_subexp_standard (struct type *expect_type,
381 struct expression *exp, int *pos,
386 int pc, pc2 = 0, oldpos;
387 struct value *arg1 = NULL;
388 struct value *arg2 = NULL;
392 struct value **argvec;
393 int upper, lower, retcode;
397 struct type **arg_types;
401 op = exp->elts[pc].opcode;
406 tem = longest_to_int (exp->elts[pc + 2].longconst);
407 (*pos) += 4 + BYTES_TO_EXP_ELEM (tem + 1);
408 arg1 = value_aggregate_elt (exp->elts[pc + 1].type,
409 &exp->elts[pc + 3].string,
412 error ("There is no field named %s", &exp->elts[pc + 3].string);
417 return value_from_longest (exp->elts[pc + 1].type,
418 exp->elts[pc + 2].longconst);
422 return value_from_double (exp->elts[pc + 1].type,
423 exp->elts[pc + 2].doubleconst);
427 if (noside == EVAL_SKIP)
430 /* JYG: We used to just return value_zero of the symbol type
431 if we're asked to avoid side effects. Otherwise we return
432 value_of_variable (...). However I'm not sure if
433 value_of_variable () has any side effect.
434 We need a full value object returned here for whatis_exp ()
435 to call evaluate_type () and then pass the full value to
436 value_rtti_target_type () if we are dealing with a pointer
437 or reference to a base class and print object is on. */
439 return value_of_variable (exp->elts[pc + 2].symbol,
440 exp->elts[pc + 1].block);
445 access_value_history (longest_to_int (exp->elts[pc + 1].longconst));
449 int regno = longest_to_int (exp->elts[pc + 1].longconst);
450 struct value *val = value_of_register (regno, get_selected_frame ());
453 error ("Value of register %s not available.",
454 frame_map_regnum_to_name (get_selected_frame (), regno));
460 return value_from_longest (LA_BOOL_TYPE,
461 exp->elts[pc + 1].longconst);
465 return value_of_internalvar (exp->elts[pc + 1].internalvar);
468 tem = longest_to_int (exp->elts[pc + 1].longconst);
469 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
470 if (noside == EVAL_SKIP)
472 return value_string (&exp->elts[pc + 2].string, tem);
474 case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant. */
475 tem = longest_to_int (exp->elts[pc + 1].longconst);
476 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
477 if (noside == EVAL_SKIP)
481 return (struct value *) value_nsstring (&exp->elts[pc + 2].string, tem + 1);
484 tem = longest_to_int (exp->elts[pc + 1].longconst);
486 += 3 + BYTES_TO_EXP_ELEM ((tem + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
487 if (noside == EVAL_SKIP)
489 return value_bitstring (&exp->elts[pc + 2].string, tem);
494 tem2 = longest_to_int (exp->elts[pc + 1].longconst);
495 tem3 = longest_to_int (exp->elts[pc + 2].longconst);
496 nargs = tem3 - tem2 + 1;
497 type = expect_type ? check_typedef (expect_type) : NULL_TYPE;
499 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
500 && TYPE_CODE (type) == TYPE_CODE_STRUCT)
502 struct value *rec = allocate_value (expect_type);
503 memset (VALUE_CONTENTS_RAW (rec), '\0', TYPE_LENGTH (type));
504 return evaluate_struct_tuple (rec, exp, pos, noside, nargs);
507 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
508 && TYPE_CODE (type) == TYPE_CODE_ARRAY)
510 struct type *range_type = TYPE_FIELD_TYPE (type, 0);
511 struct type *element_type = TYPE_TARGET_TYPE (type);
512 struct value *array = allocate_value (expect_type);
513 int element_size = TYPE_LENGTH (check_typedef (element_type));
514 LONGEST low_bound, high_bound, index;
515 if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
518 high_bound = (TYPE_LENGTH (type) / element_size) - 1;
521 memset (VALUE_CONTENTS_RAW (array), 0, TYPE_LENGTH (expect_type));
522 for (tem = nargs; --nargs >= 0;)
524 struct value *element;
526 if (exp->elts[*pos].opcode == BINOP_RANGE)
529 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
531 element = evaluate_subexp (element_type, exp, pos, noside);
532 if (VALUE_TYPE (element) != element_type)
533 element = value_cast (element_type, element);
536 int continue_pc = *pos;
538 index = init_array_element (array, element, exp, pos, noside,
539 low_bound, high_bound);
544 if (index > high_bound)
545 /* to avoid memory corruption */
546 error ("Too many array elements");
547 memcpy (VALUE_CONTENTS_RAW (array)
548 + (index - low_bound) * element_size,
549 VALUE_CONTENTS (element),
557 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
558 && TYPE_CODE (type) == TYPE_CODE_SET)
560 struct value *set = allocate_value (expect_type);
561 char *valaddr = VALUE_CONTENTS_RAW (set);
562 struct type *element_type = TYPE_INDEX_TYPE (type);
563 struct type *check_type = element_type;
564 LONGEST low_bound, high_bound;
566 /* get targettype of elementtype */
567 while (TYPE_CODE (check_type) == TYPE_CODE_RANGE ||
568 TYPE_CODE (check_type) == TYPE_CODE_TYPEDEF)
569 check_type = TYPE_TARGET_TYPE (check_type);
571 if (get_discrete_bounds (element_type, &low_bound, &high_bound) < 0)
572 error ("(power)set type with unknown size");
573 memset (valaddr, '\0', TYPE_LENGTH (type));
574 for (tem = 0; tem < nargs; tem++)
576 LONGEST range_low, range_high;
577 struct type *range_low_type, *range_high_type;
578 struct value *elem_val;
579 if (exp->elts[*pos].opcode == BINOP_RANGE)
582 elem_val = evaluate_subexp (element_type, exp, pos, noside);
583 range_low_type = VALUE_TYPE (elem_val);
584 range_low = value_as_long (elem_val);
585 elem_val = evaluate_subexp (element_type, exp, pos, noside);
586 range_high_type = VALUE_TYPE (elem_val);
587 range_high = value_as_long (elem_val);
591 elem_val = evaluate_subexp (element_type, exp, pos, noside);
592 range_low_type = range_high_type = VALUE_TYPE (elem_val);
593 range_low = range_high = value_as_long (elem_val);
595 /* check types of elements to avoid mixture of elements from
596 different types. Also check if type of element is "compatible"
597 with element type of powerset */
598 if (TYPE_CODE (range_low_type) == TYPE_CODE_RANGE)
599 range_low_type = TYPE_TARGET_TYPE (range_low_type);
600 if (TYPE_CODE (range_high_type) == TYPE_CODE_RANGE)
601 range_high_type = TYPE_TARGET_TYPE (range_high_type);
602 if ((TYPE_CODE (range_low_type) != TYPE_CODE (range_high_type)) ||
603 (TYPE_CODE (range_low_type) == TYPE_CODE_ENUM &&
604 (range_low_type != range_high_type)))
605 /* different element modes */
606 error ("POWERSET tuple elements of different mode");
607 if ((TYPE_CODE (check_type) != TYPE_CODE (range_low_type)) ||
608 (TYPE_CODE (check_type) == TYPE_CODE_ENUM &&
609 range_low_type != check_type))
610 error ("incompatible POWERSET tuple elements");
611 if (range_low > range_high)
613 warning ("empty POWERSET tuple range");
616 if (range_low < low_bound || range_high > high_bound)
617 error ("POWERSET tuple element out of range");
618 range_low -= low_bound;
619 range_high -= low_bound;
620 for (; range_low <= range_high; range_low++)
622 int bit_index = (unsigned) range_low % TARGET_CHAR_BIT;
624 bit_index = TARGET_CHAR_BIT - 1 - bit_index;
625 valaddr[(unsigned) range_low / TARGET_CHAR_BIT]
632 argvec = (struct value **) alloca (sizeof (struct value *) * nargs);
633 for (tem = 0; tem < nargs; tem++)
635 /* Ensure that array expressions are coerced into pointer objects. */
636 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
638 if (noside == EVAL_SKIP)
640 return value_array (tem2, tem3, argvec);
644 struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside);
646 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
648 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
649 if (noside == EVAL_SKIP)
651 return value_slice (array, lowbound, upper - lowbound + 1);
654 case TERNOP_SLICE_COUNT:
656 struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside);
658 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
660 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
661 return value_slice (array, lowbound, length);
665 /* Skip third and second args to evaluate the first one. */
666 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
667 if (value_logical_not (arg1))
669 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
670 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
674 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
675 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
679 case OP_OBJC_SELECTOR:
680 { /* Objective C @selector operator. */
681 char *sel = &exp->elts[pc + 2].string;
682 int len = longest_to_int (exp->elts[pc + 1].longconst);
684 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
685 if (noside == EVAL_SKIP)
689 sel[len] = 0; /* Make sure it's terminated. */
690 return value_from_longest (lookup_pointer_type (builtin_type_void),
691 lookup_child_selector (sel));
694 case OP_OBJC_MSGCALL:
695 { /* Objective C message (method) call. */
697 static CORE_ADDR responds_selector = 0;
698 static CORE_ADDR method_selector = 0;
700 CORE_ADDR selector = 0;
703 int struct_return = 0;
706 static struct value *msg_send = NULL;
707 static struct value *msg_send_stret = NULL;
708 static int gnu_runtime = 0;
710 struct value *target = NULL;
711 struct value *method = NULL;
712 struct value *called_method = NULL;
714 struct type *selector_type = NULL;
716 struct value *ret = NULL;
719 selector = exp->elts[pc + 1].longconst;
720 nargs = exp->elts[pc + 2].longconst;
721 argvec = (struct value **) alloca (sizeof (struct value *)
726 selector_type = lookup_pointer_type (builtin_type_void);
727 if (noside == EVAL_AVOID_SIDE_EFFECTS)
728 sub_no_side = EVAL_NORMAL;
730 sub_no_side = noside;
732 target = evaluate_subexp (selector_type, exp, pos, sub_no_side);
734 if (value_as_long (target) == 0)
735 return value_from_longest (builtin_type_long, 0);
737 if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0))
740 /* Find the method dispatch (Apple runtime) or method lookup
741 (GNU runtime) function for Objective-C. These will be used
742 to lookup the symbol information for the method. If we
743 can't find any symbol information, then we'll use these to
744 call the method, otherwise we can call the method
745 directly. The msg_send_stret function is used in the special
746 case of a method that returns a structure (Apple runtime
751 type = lookup_pointer_type (builtin_type_void);
752 type = lookup_function_type (type);
753 type = lookup_pointer_type (type);
754 type = lookup_function_type (type);
755 type = lookup_pointer_type (type);
757 msg_send = find_function_in_inferior ("objc_msg_lookup");
758 msg_send_stret = find_function_in_inferior ("objc_msg_lookup");
760 msg_send = value_from_pointer (type, value_as_address (msg_send));
761 msg_send_stret = value_from_pointer (type,
762 value_as_address (msg_send_stret));
766 msg_send = find_function_in_inferior ("objc_msgSend");
767 /* Special dispatcher for methods returning structs */
768 msg_send_stret = find_function_in_inferior ("objc_msgSend_stret");
771 /* Verify the target object responds to this method. The
772 standard top-level 'Object' class uses a different name for
773 the verification method than the non-standard, but more
774 often used, 'NSObject' class. Make sure we check for both. */
776 responds_selector = lookup_child_selector ("respondsToSelector:");
777 if (responds_selector == 0)
778 responds_selector = lookup_child_selector ("respondsTo:");
780 if (responds_selector == 0)
781 error ("no 'respondsTo:' or 'respondsToSelector:' method");
783 method_selector = lookup_child_selector ("methodForSelector:");
784 if (method_selector == 0)
785 method_selector = lookup_child_selector ("methodFor:");
787 if (method_selector == 0)
788 error ("no 'methodFor:' or 'methodForSelector:' method");
790 /* Call the verification method, to make sure that the target
791 class implements the desired method. */
793 argvec[0] = msg_send;
795 argvec[2] = value_from_longest (builtin_type_long, responds_selector);
796 argvec[3] = value_from_longest (builtin_type_long, selector);
799 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
802 /* Function objc_msg_lookup returns a pointer. */
804 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
806 if (value_as_long (ret) == 0)
807 error ("Target does not respond to this message selector.");
809 /* Call "methodForSelector:" method, to get the address of a
810 function method that implements this selector for this
811 class. If we can find a symbol at that address, then we
812 know the return type, parameter types etc. (that's a good
815 argvec[0] = msg_send;
817 argvec[2] = value_from_longest (builtin_type_long, method_selector);
818 argvec[3] = value_from_longest (builtin_type_long, selector);
821 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
825 ret = call_function_by_hand (argvec[0], 3, argvec + 1);
828 /* ret should now be the selector. */
830 addr = value_as_long (ret);
833 struct symbol *sym = NULL;
834 /* Is it a high_level symbol? */
836 sym = find_pc_function (addr);
838 method = value_of_variable (sym, 0);
841 /* If we found a method with symbol information, check to see
842 if it returns a struct. Otherwise assume it doesn't. */
848 struct type *value_type;
850 funaddr = find_function_addr (method, &value_type);
852 b = block_for_pc (funaddr);
854 /* If compiled without -g, assume GCC 2. */
855 using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b));
857 CHECK_TYPEDEF (value_type);
859 if ((value_type == NULL)
860 || (TYPE_CODE(value_type) == TYPE_CODE_ERROR))
862 if (expect_type != NULL)
863 value_type = expect_type;
866 struct_return = using_struct_return (value_type, using_gcc);
868 else if (expect_type != NULL)
870 struct_return = using_struct_return (check_typedef (expect_type), using_gcc);
873 /* Found a function symbol. Now we will substitute its
874 value in place of the message dispatcher (obj_msgSend),
875 so that we call the method directly instead of thru
876 the dispatcher. The main reason for doing this is that
877 we can now evaluate the return value and parameter values
878 according to their known data types, in case we need to
879 do things like promotion, dereferencing, special handling
880 of structs and doubles, etc.
882 We want to use the type signature of 'method', but still
883 jump to objc_msgSend() or objc_msgSend_stret() to better
884 mimic the behavior of the runtime. */
888 if (TYPE_CODE (VALUE_TYPE (method)) != TYPE_CODE_FUNC)
889 error ("method address has symbol information with non-function type; skipping");
891 VALUE_ADDRESS (method) = value_as_address (msg_send_stret);
893 VALUE_ADDRESS (method) = value_as_address (msg_send);
894 called_method = method;
899 called_method = msg_send_stret;
901 called_method = msg_send;
904 if (noside == EVAL_SKIP)
907 if (noside == EVAL_AVOID_SIDE_EFFECTS)
909 /* If the return type doesn't look like a function type,
910 call an error. This can happen if somebody tries to
911 turn a variable into a function call. This is here
912 because people often want to call, eg, strcmp, which
913 gdb doesn't know is a function. If gdb isn't asked for
914 it's opinion (ie. through "whatis"), it won't offer
917 struct type *type = VALUE_TYPE (called_method);
918 if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
919 type = TYPE_TARGET_TYPE (type);
920 type = TYPE_TARGET_TYPE (type);
924 if ((TYPE_CODE (type) == TYPE_CODE_ERROR) && expect_type)
925 return allocate_value (expect_type);
927 return allocate_value (type);
930 error ("Expression of type other than \"method returning ...\" used as a method");
933 /* Now depending on whether we found a symbol for the method,
934 we will either call the runtime dispatcher or the method
937 argvec[0] = called_method;
939 argvec[2] = value_from_longest (builtin_type_long, selector);
940 /* User-supplied arguments. */
941 for (tem = 0; tem < nargs; tem++)
942 argvec[tem + 3] = evaluate_subexp_with_coercion (exp, pos, noside);
945 if (gnu_runtime && (method != NULL))
947 /* Function objc_msg_lookup returns a pointer. */
948 VALUE_TYPE (argvec[0]) = lookup_function_type
949 (lookup_pointer_type (VALUE_TYPE (argvec[0])));
950 argvec[0] = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
953 ret = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
960 op = exp->elts[*pos].opcode;
961 nargs = longest_to_int (exp->elts[pc + 1].longconst);
962 /* Allocate arg vector, including space for the function to be
963 called in argvec[0] and a terminating NULL */
964 argvec = (struct value **) alloca (sizeof (struct value *) * (nargs + 3));
965 if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
969 /* 1997-08-01 Currently we do not support function invocation
970 via pointers-to-methods with HP aCC. Pointer does not point
971 to the function, but possibly to some thunk. */
972 if (deprecated_hp_som_som_object_present)
974 error ("Not implemented: function invocation through pointer to method with HP aCC");
978 /* First, evaluate the structure into arg2 */
981 if (noside == EVAL_SKIP)
984 if (op == STRUCTOP_MEMBER)
986 arg2 = evaluate_subexp_for_address (exp, pos, noside);
990 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
993 /* If the function is a virtual function, then the
994 aggregate value (providing the structure) plays
995 its part by providing the vtable. Otherwise,
996 it is just along for the ride: call the function
999 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1001 fnptr = value_as_long (arg1);
1003 if (METHOD_PTR_IS_VIRTUAL (fnptr))
1005 int fnoffset = METHOD_PTR_TO_VOFFSET (fnptr);
1006 struct type *basetype;
1007 struct type *domain_type =
1008 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)));
1010 basetype = TYPE_TARGET_TYPE (VALUE_TYPE (arg2));
1011 if (domain_type != basetype)
1012 arg2 = value_cast (lookup_pointer_type (domain_type), arg2);
1013 basetype = TYPE_VPTR_BASETYPE (domain_type);
1014 for (i = TYPE_NFN_FIELDS (basetype) - 1; i >= 0; i--)
1016 struct fn_field *f = TYPE_FN_FIELDLIST1 (basetype, i);
1017 /* If one is virtual, then all are virtual. */
1018 if (TYPE_FN_FIELD_VIRTUAL_P (f, 0))
1019 for (j = TYPE_FN_FIELDLIST_LENGTH (basetype, i) - 1; j >= 0; --j)
1020 if ((int) TYPE_FN_FIELD_VOFFSET (f, j) == fnoffset)
1022 struct value *temp = value_ind (arg2);
1023 arg1 = value_virtual_fn_field (&temp, f, j, domain_type, 0);
1024 arg2 = value_addr (temp);
1029 error ("virtual function at index %d not found", fnoffset);
1033 VALUE_TYPE (arg1) = lookup_pointer_type (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)));
1037 /* Now, say which argument to start evaluating from */
1040 else if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
1042 /* Hair for method invocations */
1046 /* First, evaluate the structure into arg2 */
1048 tem2 = longest_to_int (exp->elts[pc2 + 1].longconst);
1049 *pos += 3 + BYTES_TO_EXP_ELEM (tem2 + 1);
1050 if (noside == EVAL_SKIP)
1053 if (op == STRUCTOP_STRUCT)
1055 /* If v is a variable in a register, and the user types
1056 v.method (), this will produce an error, because v has
1059 A possible way around this would be to allocate a
1060 copy of the variable on the stack, copy in the
1061 contents, call the function, and copy out the
1062 contents. I.e. convert this from call by reference
1063 to call by copy-return (or whatever it's called).
1064 However, this does not work because it is not the
1065 same: the method being called could stash a copy of
1066 the address, and then future uses through that address
1067 (after the method returns) would be expected to
1068 use the variable itself, not some copy of it. */
1069 arg2 = evaluate_subexp_for_address (exp, pos, noside);
1073 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1075 /* Now, say which argument to start evaluating from */
1080 /* Non-method function call */
1082 argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside);
1084 type = VALUE_TYPE (argvec[0]);
1085 if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
1086 type = TYPE_TARGET_TYPE (type);
1087 if (type && TYPE_CODE (type) == TYPE_CODE_FUNC)
1089 for (; tem <= nargs && tem <= TYPE_NFIELDS (type); tem++)
1091 /* pai: FIXME This seems to be coercing arguments before
1092 * overload resolution has been done! */
1093 argvec[tem] = evaluate_subexp (TYPE_FIELD_TYPE (type, tem - 1),
1099 /* Evaluate arguments */
1100 for (; tem <= nargs; tem++)
1102 /* Ensure that array expressions are coerced into pointer objects. */
1103 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
1106 /* signal end of arglist */
1109 if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
1111 int static_memfuncp;
1114 /* Method invocation : stuff "this" as first parameter */
1116 /* Name of method from expression */
1117 strcpy (tstr, &exp->elts[pc2 + 2].string);
1119 if (overload_resolution && (exp->language_defn->la_language == language_cplus))
1121 /* Language is C++, do some overload resolution before evaluation */
1122 struct value *valp = NULL;
1124 /* Prepare list of argument types for overload resolution */
1125 arg_types = (struct type **) alloca (nargs * (sizeof (struct type *)));
1126 for (ix = 1; ix <= nargs; ix++)
1127 arg_types[ix - 1] = VALUE_TYPE (argvec[ix]);
1129 (void) find_overload_match (arg_types, nargs, tstr,
1130 1 /* method */ , 0 /* strict match */ ,
1131 &arg2 /* the object */ , NULL,
1132 &valp, NULL, &static_memfuncp);
1135 argvec[1] = arg2; /* the ``this'' pointer */
1136 argvec[0] = valp; /* use the method found after overload resolution */
1139 /* Non-C++ case -- or no overload resolution */
1141 struct value *temp = arg2;
1142 argvec[0] = value_struct_elt (&temp, argvec + 1, tstr,
1144 op == STRUCTOP_STRUCT
1145 ? "structure" : "structure pointer");
1146 /* value_struct_elt updates temp with the correct value
1147 of the ``this'' pointer if necessary, so modify argvec[1] to
1148 reflect any ``this'' changes. */
1149 arg2 = value_from_longest (lookup_pointer_type(VALUE_TYPE (temp)),
1150 VALUE_ADDRESS (temp) + VALUE_OFFSET (temp)
1151 + VALUE_EMBEDDED_OFFSET (temp));
1152 argvec[1] = arg2; /* the ``this'' pointer */
1155 if (static_memfuncp)
1157 argvec[1] = argvec[0];
1162 else if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
1167 else if (op == OP_VAR_VALUE)
1169 /* Non-member function being called */
1170 /* fn: This can only be done for C++ functions. A C-style function
1171 in a C++ program, for instance, does not have the fields that
1172 are expected here */
1174 if (overload_resolution && (exp->language_defn->la_language == language_cplus))
1176 /* Language is C++, do some overload resolution before evaluation */
1177 struct symbol *symp;
1179 /* Prepare list of argument types for overload resolution */
1180 arg_types = (struct type **) alloca (nargs * (sizeof (struct type *)));
1181 for (ix = 1; ix <= nargs; ix++)
1182 arg_types[ix - 1] = VALUE_TYPE (argvec[ix]);
1184 (void) find_overload_match (arg_types, nargs, NULL /* no need for name */ ,
1185 0 /* not method */ , 0 /* strict match */ ,
1186 NULL, exp->elts[save_pos1+2].symbol /* the function */ ,
1189 /* Now fix the expression being evaluated */
1190 exp->elts[save_pos1+2].symbol = symp;
1191 argvec[0] = evaluate_subexp_with_coercion (exp, &save_pos1, noside);
1195 /* Not C++, or no overload resolution allowed */
1196 /* nothing to be done; argvec already correctly set up */
1201 /* It is probably a C-style function */
1202 /* nothing to be done; argvec already correctly set up */
1207 if (noside == EVAL_SKIP)
1209 if (argvec[0] == NULL)
1210 error ("Cannot evaluate function -- may be inlined");
1211 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1213 /* If the return type doesn't look like a function type, call an
1214 error. This can happen if somebody tries to turn a variable into
1215 a function call. This is here because people often want to
1216 call, eg, strcmp, which gdb doesn't know is a function. If
1217 gdb isn't asked for it's opinion (ie. through "whatis"),
1218 it won't offer it. */
1220 struct type *ftype =
1221 TYPE_TARGET_TYPE (VALUE_TYPE (argvec[0]));
1224 return allocate_value (TYPE_TARGET_TYPE (VALUE_TYPE (argvec[0])));
1226 error ("Expression of type other than \"Function returning ...\" used as function");
1228 return call_function_by_hand (argvec[0], nargs, argvec + 1);
1229 /* pai: FIXME save value from call_function_by_hand, then adjust pc by adjust_fn_pc if +ve */
1231 case OP_F77_UNDETERMINED_ARGLIST:
1233 /* Remember that in F77, functions, substring ops and
1234 array subscript operations cannot be disambiguated
1235 at parse time. We have made all array subscript operations,
1236 substring operations as well as function calls come here
1237 and we now have to discover what the heck this thing actually was.
1238 If it is a function, we process just as if we got an OP_FUNCALL. */
1240 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1243 /* First determine the type code we are dealing with. */
1244 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1245 type = check_typedef (VALUE_TYPE (arg1));
1246 code = TYPE_CODE (type);
1250 case TYPE_CODE_ARRAY:
1251 goto multi_f77_subscript;
1253 case TYPE_CODE_STRING:
1257 case TYPE_CODE_FUNC:
1258 /* It's a function call. */
1259 /* Allocate arg vector, including space for the function to be
1260 called in argvec[0] and a terminating NULL */
1261 argvec = (struct value **) alloca (sizeof (struct value *) * (nargs + 2));
1264 for (; tem <= nargs; tem++)
1265 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
1266 argvec[tem] = 0; /* signal end of arglist */
1270 error ("Cannot perform substring on this type");
1274 /* We have a substring operation on our hands here,
1275 let us get the string we will be dealing with */
1277 /* Now evaluate the 'from' and 'to' */
1279 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1282 return value_subscript (arg1, arg2);
1284 arg3 = evaluate_subexp_with_coercion (exp, pos, noside);
1286 if (noside == EVAL_SKIP)
1289 tem2 = value_as_long (arg2);
1290 tem3 = value_as_long (arg3);
1292 return value_slice (arg1, tem2, tem3 - tem2 + 1);
1295 /* We have a complex number, There should be 2 floating
1296 point numbers that compose it */
1297 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1298 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1300 return value_literal_complex (arg1, arg2, builtin_type_f_complex_s16);
1302 case STRUCTOP_STRUCT:
1303 tem = longest_to_int (exp->elts[pc + 1].longconst);
1304 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
1305 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1306 if (noside == EVAL_SKIP)
1308 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1309 return value_zero (lookup_struct_elt_type (VALUE_TYPE (arg1),
1310 &exp->elts[pc + 2].string,
1315 struct value *temp = arg1;
1316 return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
1321 tem = longest_to_int (exp->elts[pc + 1].longconst);
1322 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
1323 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1324 if (noside == EVAL_SKIP)
1327 /* JYG: if print object is on we need to replace the base type
1328 with rtti type in order to continue on with successful
1329 lookup of member / method only available in the rtti type. */
1331 struct type *type = VALUE_TYPE (arg1);
1332 struct type *real_type;
1333 int full, top, using_enc;
1335 if (objectprint && TYPE_TARGET_TYPE(type) &&
1336 (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
1338 real_type = value_rtti_target_type (arg1, &full, &top, &using_enc);
1341 if (TYPE_CODE (type) == TYPE_CODE_PTR)
1342 real_type = lookup_pointer_type (real_type);
1344 real_type = lookup_reference_type (real_type);
1346 arg1 = value_cast (real_type, arg1);
1351 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1352 return value_zero (lookup_struct_elt_type (VALUE_TYPE (arg1),
1353 &exp->elts[pc + 2].string,
1358 struct value *temp = arg1;
1359 return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
1360 NULL, "structure pointer");
1363 case STRUCTOP_MEMBER:
1364 arg1 = evaluate_subexp_for_address (exp, pos, noside);
1365 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1367 /* With HP aCC, pointers to methods do not point to the function code */
1368 if (deprecated_hp_som_som_object_present &&
1369 (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR) &&
1370 (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg2))) == TYPE_CODE_METHOD))
1371 error ("Pointers to methods not supported with HP aCC"); /* 1997-08-19 */
1373 mem_offset = value_as_long (arg2);
1374 goto handle_pointer_to_member;
1377 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1378 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1380 /* With HP aCC, pointers to methods do not point to the function code */
1381 if (deprecated_hp_som_som_object_present &&
1382 (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR) &&
1383 (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg2))) == TYPE_CODE_METHOD))
1384 error ("Pointers to methods not supported with HP aCC"); /* 1997-08-19 */
1386 mem_offset = value_as_long (arg2);
1388 handle_pointer_to_member:
1389 /* HP aCC generates offsets that have bit #29 set; turn it off to get
1390 a real offset to the member. */
1391 if (deprecated_hp_som_som_object_present)
1393 if (!mem_offset) /* no bias -> really null */
1394 error ("Attempted dereference of null pointer-to-member");
1395 mem_offset &= ~0x20000000;
1397 if (noside == EVAL_SKIP)
1399 type = check_typedef (VALUE_TYPE (arg2));
1400 if (TYPE_CODE (type) != TYPE_CODE_PTR)
1401 goto bad_pointer_to_member;
1402 type = check_typedef (TYPE_TARGET_TYPE (type));
1403 if (TYPE_CODE (type) == TYPE_CODE_METHOD)
1404 error ("not implemented: pointer-to-method in pointer-to-member construct");
1405 if (TYPE_CODE (type) != TYPE_CODE_MEMBER)
1406 goto bad_pointer_to_member;
1407 /* Now, convert these values to an address. */
1408 arg1 = value_cast (lookup_pointer_type (TYPE_DOMAIN_TYPE (type)),
1410 arg3 = value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
1411 value_as_long (arg1) + mem_offset);
1412 return value_ind (arg3);
1413 bad_pointer_to_member:
1414 error ("non-pointer-to-member value used in pointer-to-member construct");
1417 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1418 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1419 if (noside == EVAL_SKIP)
1421 if (binop_user_defined_p (op, arg1, arg2))
1422 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1424 return value_concat (arg1, arg2);
1427 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1428 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1430 /* Do special stuff for HP aCC pointers to members */
1431 if (deprecated_hp_som_som_object_present)
1433 /* 1997-08-19 Can't assign HP aCC pointers to methods. No details of
1434 the implementation yet; but the pointer appears to point to a code
1435 sequence (thunk) in memory -- in any case it is *not* the address
1436 of the function as it would be in a naive implementation. */
1437 if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR) &&
1438 (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_METHOD))
1439 error ("Assignment to pointers to methods not implemented with HP aCC");
1441 /* HP aCC pointers to data members require a constant bias */
1442 if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR) &&
1443 (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_MEMBER))
1445 unsigned int *ptr = (unsigned int *) VALUE_CONTENTS (arg2); /* forces evaluation */
1446 *ptr |= 0x20000000; /* set 29th bit */
1450 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1452 if (binop_user_defined_p (op, arg1, arg2))
1453 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1455 return value_assign (arg1, arg2);
1457 case BINOP_ASSIGN_MODIFY:
1459 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1460 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1461 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1463 op = exp->elts[pc + 1].opcode;
1464 if (binop_user_defined_p (op, arg1, arg2))
1465 return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op, noside);
1466 else if (op == BINOP_ADD)
1467 arg2 = value_add (arg1, arg2);
1468 else if (op == BINOP_SUB)
1469 arg2 = value_sub (arg1, arg2);
1471 arg2 = value_binop (arg1, arg2, op);
1472 return value_assign (arg1, arg2);
1475 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1476 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1477 if (noside == EVAL_SKIP)
1479 if (binop_user_defined_p (op, arg1, arg2))
1480 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1482 return value_add (arg1, arg2);
1485 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1486 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1487 if (noside == EVAL_SKIP)
1489 if (binop_user_defined_p (op, arg1, arg2))
1490 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1492 return value_sub (arg1, arg2);
1500 case BINOP_BITWISE_AND:
1501 case BINOP_BITWISE_IOR:
1502 case BINOP_BITWISE_XOR:
1503 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1504 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1505 if (noside == EVAL_SKIP)
1507 if (binop_user_defined_p (op, arg1, arg2))
1508 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1509 else if (noside == EVAL_AVOID_SIDE_EFFECTS
1510 && (op == BINOP_DIV || op == BINOP_REM || op == BINOP_MOD))
1511 return value_zero (VALUE_TYPE (arg1), not_lval);
1513 return value_binop (arg1, arg2, op);
1516 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1517 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1518 if (noside == EVAL_SKIP)
1520 error ("':' operator used in invalid context");
1522 case BINOP_SUBSCRIPT:
1523 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1524 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1525 if (noside == EVAL_SKIP)
1527 if (binop_user_defined_p (op, arg1, arg2))
1528 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1531 /* If the user attempts to subscript something that is not an
1532 array or pointer type (like a plain int variable for example),
1533 then report this as an error. */
1536 type = check_typedef (VALUE_TYPE (arg1));
1537 if (TYPE_CODE (type) != TYPE_CODE_ARRAY
1538 && TYPE_CODE (type) != TYPE_CODE_PTR)
1540 if (TYPE_NAME (type))
1541 error ("cannot subscript something of type `%s'",
1544 error ("cannot subscript requested type");
1547 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1548 return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
1550 return value_subscript (arg1, arg2);
1554 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1555 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1556 if (noside == EVAL_SKIP)
1558 return value_in (arg1, arg2);
1560 case MULTI_SUBSCRIPT:
1562 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1563 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1566 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1567 /* FIXME: EVAL_SKIP handling may not be correct. */
1568 if (noside == EVAL_SKIP)
1579 /* FIXME: EVAL_AVOID_SIDE_EFFECTS handling may not be correct. */
1580 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1582 /* If the user attempts to subscript something that has no target
1583 type (like a plain int variable for example), then report this
1586 type = TYPE_TARGET_TYPE (check_typedef (VALUE_TYPE (arg1)));
1589 arg1 = value_zero (type, VALUE_LVAL (arg1));
1595 error ("cannot subscript something of type `%s'",
1596 TYPE_NAME (VALUE_TYPE (arg1)));
1600 if (binop_user_defined_p (op, arg1, arg2))
1602 arg1 = value_x_binop (arg1, arg2, op, OP_NULL, noside);
1606 arg1 = value_subscript (arg1, arg2);
1611 multi_f77_subscript:
1613 int subscript_array[MAX_FORTRAN_DIMS + 1]; /* 1-based array of
1614 subscripts, max == 7 */
1615 int array_size_array[MAX_FORTRAN_DIMS + 1];
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 for (i = 1; i <= nargs; i++)
1635 /* Evaluate each subscript, It must be a legal integer in F77 */
1636 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1638 /* Fill in the subscript and array size arrays */
1640 subscript_array[i] = value_as_long (arg2);
1642 retcode = f77_get_dynamic_upperbound (tmp_type, &upper);
1643 if (retcode == BOUND_FETCH_ERROR)
1644 error ("Cannot obtain dynamic upper bound");
1646 retcode = f77_get_dynamic_lowerbound (tmp_type, &lower);
1647 if (retcode == BOUND_FETCH_ERROR)
1648 error ("Cannot obtain dynamic lower bound");
1650 array_size_array[i] = upper - lower + 1;
1652 /* Zero-normalize subscripts so that offsetting will work. */
1654 subscript_array[i] -= lower;
1656 /* If we are at the bottom of a multidimensional
1657 array type then keep a ptr to the last ARRAY
1658 type around for use when calling value_subscript()
1659 below. This is done because we pretend to value_subscript
1660 that we actually have a one-dimensional array
1661 of base element type that we apply a simple
1665 tmp_type = check_typedef (TYPE_TARGET_TYPE (tmp_type));
1668 /* Now let us calculate the offset for this item */
1670 offset_item = subscript_array[ndimensions];
1672 for (i = ndimensions - 1; i >= 1; i--)
1674 array_size_array[i] * offset_item + subscript_array[i];
1676 /* Construct a value node with the value of the offset */
1678 arg2 = value_from_longest (builtin_type_f_integer, offset_item);
1680 /* Let us now play a dirty trick: we will take arg1
1681 which is a value node pointing to the topmost level
1682 of the multidimensional array-set and pretend
1683 that it is actually a array of the final element
1684 type, this will ensure that value_subscript()
1685 returns the correct type value */
1687 VALUE_TYPE (arg1) = tmp_type;
1688 return value_ind (value_add (value_coerce_array (arg1), arg2));
1691 case BINOP_LOGICAL_AND:
1692 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1693 if (noside == EVAL_SKIP)
1695 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1700 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1703 if (binop_user_defined_p (op, arg1, arg2))
1705 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1706 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1710 tem = value_logical_not (arg1);
1711 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
1712 (tem ? EVAL_SKIP : noside));
1713 return value_from_longest (LA_BOOL_TYPE,
1714 (LONGEST) (!tem && !value_logical_not (arg2)));
1717 case BINOP_LOGICAL_OR:
1718 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1719 if (noside == EVAL_SKIP)
1721 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1726 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1729 if (binop_user_defined_p (op, arg1, arg2))
1731 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1732 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1736 tem = value_logical_not (arg1);
1737 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
1738 (!tem ? EVAL_SKIP : noside));
1739 return value_from_longest (LA_BOOL_TYPE,
1740 (LONGEST) (!tem || !value_logical_not (arg2)));
1744 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1745 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1746 if (noside == EVAL_SKIP)
1748 if (binop_user_defined_p (op, arg1, arg2))
1750 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1754 tem = value_equal (arg1, arg2);
1755 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1758 case BINOP_NOTEQUAL:
1759 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1760 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1761 if (noside == EVAL_SKIP)
1763 if (binop_user_defined_p (op, arg1, arg2))
1765 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1769 tem = value_equal (arg1, arg2);
1770 return value_from_longest (LA_BOOL_TYPE, (LONGEST) ! tem);
1774 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1775 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1776 if (noside == EVAL_SKIP)
1778 if (binop_user_defined_p (op, arg1, arg2))
1780 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1784 tem = value_less (arg1, arg2);
1785 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1789 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1790 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1791 if (noside == EVAL_SKIP)
1793 if (binop_user_defined_p (op, arg1, arg2))
1795 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1799 tem = value_less (arg2, arg1);
1800 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1804 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1805 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1806 if (noside == EVAL_SKIP)
1808 if (binop_user_defined_p (op, arg1, arg2))
1810 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1814 tem = value_less (arg2, arg1) || value_equal (arg1, arg2);
1815 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1819 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1820 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1821 if (noside == EVAL_SKIP)
1823 if (binop_user_defined_p (op, arg1, arg2))
1825 return value_x_binop (arg1, arg2, op, OP_NULL, noside);
1829 tem = value_less (arg1, arg2) || value_equal (arg1, arg2);
1830 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1834 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1835 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1836 if (noside == EVAL_SKIP)
1838 type = check_typedef (VALUE_TYPE (arg2));
1839 if (TYPE_CODE (type) != TYPE_CODE_INT)
1840 error ("Non-integral right operand for \"@\" operator.");
1841 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1843 return allocate_repeat_value (VALUE_TYPE (arg1),
1844 longest_to_int (value_as_long (arg2)));
1847 return value_repeat (arg1, longest_to_int (value_as_long (arg2)));
1850 evaluate_subexp (NULL_TYPE, exp, pos, noside);
1851 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
1854 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1855 if (noside == EVAL_SKIP)
1857 if (unop_user_defined_p (op, arg1))
1858 return value_x_unop (arg1, op, noside);
1860 return value_neg (arg1);
1862 case UNOP_COMPLEMENT:
1863 /* C++: check for and handle destructor names. */
1864 op = exp->elts[*pos].opcode;
1866 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1867 if (noside == EVAL_SKIP)
1869 if (unop_user_defined_p (UNOP_COMPLEMENT, arg1))
1870 return value_x_unop (arg1, UNOP_COMPLEMENT, noside);
1872 return value_complement (arg1);
1874 case UNOP_LOGICAL_NOT:
1875 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1876 if (noside == EVAL_SKIP)
1878 if (unop_user_defined_p (op, arg1))
1879 return value_x_unop (arg1, op, noside);
1881 return value_from_longest (LA_BOOL_TYPE,
1882 (LONGEST) value_logical_not (arg1));
1885 if (expect_type && TYPE_CODE (expect_type) == TYPE_CODE_PTR)
1886 expect_type = TYPE_TARGET_TYPE (check_typedef (expect_type));
1887 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1888 if ((TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) &&
1889 ((TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_METHOD) ||
1890 (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_MEMBER)))
1891 error ("Attempt to dereference pointer to member without an object");
1892 if (noside == EVAL_SKIP)
1894 if (unop_user_defined_p (op, arg1))
1895 return value_x_unop (arg1, op, noside);
1896 else if (noside == EVAL_AVOID_SIDE_EFFECTS)
1898 type = check_typedef (VALUE_TYPE (arg1));
1899 if (TYPE_CODE (type) == TYPE_CODE_PTR
1900 || TYPE_CODE (type) == TYPE_CODE_REF
1901 /* In C you can dereference an array to get the 1st elt. */
1902 || TYPE_CODE (type) == TYPE_CODE_ARRAY
1904 return value_zero (TYPE_TARGET_TYPE (type),
1906 else if (TYPE_CODE (type) == TYPE_CODE_INT)
1907 /* GDB allows dereferencing an int. */
1908 return value_zero (builtin_type_int, lval_memory);
1910 error ("Attempt to take contents of a non-pointer value.");
1912 return value_ind (arg1);
1915 /* C++: check for and handle pointer to members. */
1917 op = exp->elts[*pos].opcode;
1919 if (noside == EVAL_SKIP)
1923 int temm = longest_to_int (exp->elts[pc + 3].longconst);
1924 (*pos) += 3 + BYTES_TO_EXP_ELEM (temm + 1);
1927 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
1932 struct value *retvalp = evaluate_subexp_for_address (exp, pos, noside);
1933 /* If HP aCC object, use bias for pointers to members */
1934 if (deprecated_hp_som_som_object_present &&
1935 (TYPE_CODE (VALUE_TYPE (retvalp)) == TYPE_CODE_PTR) &&
1936 (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (retvalp))) == TYPE_CODE_MEMBER))
1938 unsigned int *ptr = (unsigned int *) VALUE_CONTENTS (retvalp); /* forces evaluation */
1939 *ptr |= 0x20000000; /* set 29th bit */
1945 if (noside == EVAL_SKIP)
1947 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
1950 return evaluate_subexp_for_sizeof (exp, pos);
1954 type = exp->elts[pc + 1].type;
1955 arg1 = evaluate_subexp (type, exp, pos, noside);
1956 if (noside == EVAL_SKIP)
1958 if (type != VALUE_TYPE (arg1))
1959 arg1 = value_cast (type, arg1);
1964 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1965 if (noside == EVAL_SKIP)
1967 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1968 return value_zero (exp->elts[pc + 1].type, lval_memory);
1970 return value_at_lazy (exp->elts[pc + 1].type,
1971 value_as_address (arg1),
1974 case UNOP_PREINCREMENT:
1975 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1976 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1978 else if (unop_user_defined_p (op, arg1))
1980 return value_x_unop (arg1, op, noside);
1984 arg2 = value_add (arg1, value_from_longest (builtin_type_char,
1986 return value_assign (arg1, arg2);
1989 case UNOP_PREDECREMENT:
1990 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1991 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1993 else if (unop_user_defined_p (op, arg1))
1995 return value_x_unop (arg1, op, noside);
1999 arg2 = value_sub (arg1, value_from_longest (builtin_type_char,
2001 return value_assign (arg1, arg2);
2004 case UNOP_POSTINCREMENT:
2005 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2006 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2008 else if (unop_user_defined_p (op, arg1))
2010 return value_x_unop (arg1, op, noside);
2014 arg2 = value_add (arg1, value_from_longest (builtin_type_char,
2016 value_assign (arg1, arg2);
2020 case UNOP_POSTDECREMENT:
2021 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
2022 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
2024 else if (unop_user_defined_p (op, arg1))
2026 return value_x_unop (arg1, op, noside);
2030 arg2 = value_sub (arg1, value_from_longest (builtin_type_char,
2032 value_assign (arg1, arg2);
2038 return value_of_this (1);
2042 return value_of_local ("self", 1);
2045 error ("Attempt to use a type name as an expression");
2048 /* Removing this case and compiling with gcc -Wall reveals that
2049 a lot of cases are hitting this case. Some of these should
2050 probably be removed from expression.h; others are legitimate
2051 expressions which are (apparently) not fully implemented.
2053 If there are any cases landing here which mean a user error,
2054 then they should be separate cases, with more descriptive
2058 GDB does not (yet) know how to evaluate that kind of expression");
2062 return value_from_longest (builtin_type_long, (LONGEST) 1);
2065 /* Evaluate a subexpression of EXP, at index *POS,
2066 and return the address of that subexpression.
2067 Advance *POS over the subexpression.
2068 If the subexpression isn't an lvalue, get an error.
2069 NOSIDE may be EVAL_AVOID_SIDE_EFFECTS;
2070 then only the type of the result need be correct. */
2072 static struct value *
2073 evaluate_subexp_for_address (struct expression *exp, int *pos,
2081 op = exp->elts[pc].opcode;
2087 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
2091 return value_cast (lookup_pointer_type (exp->elts[pc + 1].type),
2092 evaluate_subexp (NULL_TYPE, exp, pos, noside));
2095 var = exp->elts[pc + 2].symbol;
2097 /* C++: The "address" of a reference should yield the address
2098 * of the object pointed to. Let value_addr() deal with it. */
2099 if (TYPE_CODE (SYMBOL_TYPE (var)) == TYPE_CODE_REF)
2103 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2106 lookup_pointer_type (SYMBOL_TYPE (var));
2107 enum address_class sym_class = SYMBOL_CLASS (var);
2109 if (sym_class == LOC_CONST
2110 || sym_class == LOC_CONST_BYTES
2111 || sym_class == LOC_REGISTER
2112 || sym_class == LOC_REGPARM)
2113 error ("Attempt to take address of register or constant.");
2116 value_zero (type, not_lval);
2122 block_innermost_frame (exp->elts[pc + 1].block));
2126 if (noside == EVAL_AVOID_SIDE_EFFECTS)
2128 struct value *x = evaluate_subexp (NULL_TYPE, exp, pos, noside);
2129 if (VALUE_LVAL (x) == lval_memory)
2130 return value_zero (lookup_pointer_type (VALUE_TYPE (x)),
2133 error ("Attempt to take address of non-lval");
2135 return value_addr (evaluate_subexp (NULL_TYPE, exp, pos, noside));
2139 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
2140 When used in contexts where arrays will be coerced anyway, this is
2141 equivalent to `evaluate_subexp' but much faster because it avoids
2142 actually fetching array contents (perhaps obsolete now that we have
2145 Note that we currently only do the coercion for C expressions, where
2146 arrays are zero based and the coercion is correct. For other languages,
2147 with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION
2148 to decide if coercion is appropriate.
2153 evaluate_subexp_with_coercion (struct expression *exp,
2154 int *pos, enum noside noside)
2162 op = exp->elts[pc].opcode;
2167 var = exp->elts[pc + 2].symbol;
2168 if (TYPE_CODE (check_typedef (SYMBOL_TYPE (var))) == TYPE_CODE_ARRAY
2169 && CAST_IS_CONVERSION)
2174 (var, block_innermost_frame (exp->elts[pc + 1].block));
2175 return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (check_typedef (SYMBOL_TYPE (var)))),
2181 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
2185 /* Evaluate a subexpression of EXP, at index *POS,
2186 and return a value for the size of that subexpression.
2187 Advance *POS over the subexpression. */
2189 static struct value *
2190 evaluate_subexp_for_sizeof (struct expression *exp, int *pos)
2198 op = exp->elts[pc].opcode;
2202 /* This case is handled specially
2203 so that we avoid creating a value for the result type.
2204 If the result type is very big, it's desirable not to
2205 create a value unnecessarily. */
2208 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2209 type = check_typedef (VALUE_TYPE (val));
2210 if (TYPE_CODE (type) != TYPE_CODE_PTR
2211 && TYPE_CODE (type) != TYPE_CODE_REF
2212 && TYPE_CODE (type) != TYPE_CODE_ARRAY)
2213 error ("Attempt to take contents of a non-pointer value.");
2214 type = check_typedef (TYPE_TARGET_TYPE (type));
2215 return value_from_longest (builtin_type_int, (LONGEST)
2216 TYPE_LENGTH (type));
2220 type = check_typedef (exp->elts[pc + 1].type);
2221 return value_from_longest (builtin_type_int,
2222 (LONGEST) TYPE_LENGTH (type));
2226 type = check_typedef (SYMBOL_TYPE (exp->elts[pc + 2].symbol));
2228 value_from_longest (builtin_type_int, (LONGEST) TYPE_LENGTH (type));
2231 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
2232 return value_from_longest (builtin_type_int,
2233 (LONGEST) TYPE_LENGTH (VALUE_TYPE (val)));
2237 /* Parse a type expression in the string [P..P+LENGTH). */
2240 parse_and_eval_type (char *p, int length)
2242 char *tmp = (char *) alloca (length + 4);
2243 struct expression *expr;
2245 memcpy (tmp + 1, p, length);
2246 tmp[length + 1] = ')';
2247 tmp[length + 2] = '0';
2248 tmp[length + 3] = '\0';
2249 expr = parse_expression (tmp);
2250 if (expr->elts[0].opcode != UNOP_CAST)
2251 error ("Internal error in eval_type.");
2252 return expr->elts[1].type;
2256 calc_f77_array_dims (struct type *array_type)
2259 struct type *tmp_type;
2261 if ((TYPE_CODE (array_type) != TYPE_CODE_ARRAY))
2262 error ("Can't get dimensions for a non-array type");
2264 tmp_type = array_type;
2266 while ((tmp_type = TYPE_TARGET_TYPE (tmp_type)))
2268 if (TYPE_CODE (tmp_type) == TYPE_CODE_ARRAY)