1 /* Evaluate expressions for GDB.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include "gdb_string.h"
26 #include "expression.h"
30 #include "language.h" /* For CAST_IS_CONVERSION */
31 #include "f-lang.h" /* for array bound stuff */
32 /* start-sanitize-gm */
35 #endif /* GENERAL_MAGIC */
38 /* Prototypes for local functions. */
40 static value_ptr evaluate_subexp_for_sizeof PARAMS ((struct expression *,
43 static value_ptr evaluate_subexp_for_address PARAMS ((struct expression *,
50 evaluate_subexp (expect_type, exp, pos, noside)
51 struct type *expect_type;
52 register struct expression *exp;
56 return (*exp->language_defn->evaluate_exp) (expect_type, exp, pos, noside);
59 /* Parse the string EXP as a C expression, evaluate it,
60 and return the result as a number. */
63 parse_and_eval_address (exp)
66 struct expression *expr = parse_expression (exp);
67 register CORE_ADDR addr;
68 register struct cleanup *old_chain =
69 make_cleanup (free_current_contents, &expr);
71 addr = value_as_pointer (evaluate_expression (expr));
72 do_cleanups (old_chain);
76 /* Like parse_and_eval_address but takes a pointer to a char * variable
77 and advanced that variable across the characters parsed. */
80 parse_and_eval_address_1 (expptr)
83 struct expression *expr = parse_exp_1 (expptr, (struct block *)0, 0);
84 register CORE_ADDR addr;
85 register struct cleanup *old_chain =
86 make_cleanup (free_current_contents, &expr);
88 addr = value_as_pointer (evaluate_expression (expr));
89 do_cleanups (old_chain);
97 struct expression *expr = parse_expression (exp);
98 register value_ptr val;
99 register struct cleanup *old_chain
100 = make_cleanup (free_current_contents, &expr);
102 val = evaluate_expression (expr);
103 do_cleanups (old_chain);
107 /* Parse up to a comma (or to a closeparen)
108 in the string EXPP as an expression, evaluate it, and return the value.
109 EXPP is advanced to point to the comma. */
112 parse_to_comma_and_eval (expp)
115 struct expression *expr = parse_exp_1 (expp, (struct block *) 0, 1);
116 register value_ptr val;
117 register struct cleanup *old_chain
118 = make_cleanup (free_current_contents, &expr);
120 val = evaluate_expression (expr);
121 do_cleanups (old_chain);
125 /* Evaluate an expression in internal prefix form
126 such as is constructed by parse.y.
128 See expression.h for info on the format of an expression. */
131 evaluate_expression (exp)
132 struct expression *exp;
135 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL);
138 /* Evaluate an expression, avoiding all memory references
139 and getting a value whose type alone is correct. */
143 struct expression *exp;
146 return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
149 /* If the next expression is an OP_LABELED, skips past it,
150 returning the label. Otherwise, does nothing and returns NULL. */
154 register struct expression *exp;
157 if (exp->elts[*pos].opcode == OP_LABELED)
160 char *name = &exp->elts[pc + 2].string;
161 int tem = longest_to_int (exp->elts[pc + 1].longconst);
162 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
169 /* This function evaluates tupes (in Chill) or brace-initializers
170 (in C/C++) for structure types. */
173 evaluate_struct_tuple (struct_val, exp, pos, noside, nargs)
174 value_ptr struct_val;
175 register struct expression *exp;
180 struct type *struct_type = check_typedef (VALUE_TYPE (struct_val));
181 struct type *substruct_type = struct_type;
182 struct type *field_type;
189 value_ptr val = NULL;
194 /* Skip past the labels, and count them. */
195 while (get_label (exp, pos) != NULL)
200 char *label = get_label (exp, &pc);
203 for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
206 char *field_name = TYPE_FIELD_NAME (struct_type, fieldno);
207 if (field_name != NULL && STREQ (field_name, label))
210 subfieldno = fieldno;
211 substruct_type = struct_type;
215 for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type);
218 char *field_name = TYPE_FIELD_NAME (struct_type, fieldno);
219 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
220 if ((field_name == 0 || *field_name == '\0')
221 && TYPE_CODE (field_type) == TYPE_CODE_UNION)
224 for (; variantno < TYPE_NFIELDS (field_type);
228 = TYPE_FIELD_TYPE (field_type, variantno);
229 if (TYPE_CODE (substruct_type) == TYPE_CODE_STRUCT)
232 subfieldno < TYPE_NFIELDS (substruct_type);
235 if (STREQ (TYPE_FIELD_NAME (substruct_type,
246 error ("there is no field named %s", label);
252 /* Unlabelled tuple element - go to next field. */
256 if (subfieldno >= TYPE_NFIELDS (substruct_type))
259 substruct_type = struct_type;
265 subfieldno = fieldno;
266 if (fieldno >= TYPE_NFIELDS (struct_type))
267 error ("too many initializers");
268 field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
269 if (TYPE_CODE (field_type) == TYPE_CODE_UNION
270 && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0')
271 error ("don't know which variant you want to set");
275 /* Here, struct_type is the type of the inner struct,
276 while substruct_type is the type of the inner struct.
277 These are the same for normal structures, but a variant struct
278 contains anonymous union fields that contain substruct fields.
279 The value fieldno is the index of the top-level (normal or
280 anonymous union) field in struct_field, while the value
281 subfieldno is the index of the actual real (named inner) field
282 in substruct_type. */
284 field_type = TYPE_FIELD_TYPE (substruct_type, subfieldno);
286 val = evaluate_subexp (field_type, exp, pos, noside);
288 /* Now actually set the field in struct_val. */
290 /* Assign val to field fieldno. */
291 if (VALUE_TYPE (val) != field_type)
292 val = value_cast (field_type, val);
294 bitsize = TYPE_FIELD_BITSIZE (substruct_type, subfieldno);
295 bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno);
297 bitpos += TYPE_FIELD_BITPOS (substruct_type, subfieldno);
298 addr = VALUE_CONTENTS (struct_val) + bitpos / 8;
300 modify_field (addr, value_as_long (val),
301 bitpos % 8, bitsize);
303 memcpy (addr, VALUE_CONTENTS (val),
304 TYPE_LENGTH (VALUE_TYPE (val)));
305 } while (--nlabels > 0);
310 /* Recursive helper function for setting elements of array tuples for Chill.
311 The target is ARRAY (which has bounds LOW_BOUND to HIGH_BOUND);
312 the element value is ELEMENT;
313 EXP, POS and NOSIDE are as usual.
314 Evaluates index expresions and sets the specified element(s) of
316 Returns last index value. */
319 init_array_element (array, element, exp, pos, noside, low_bound, high_bound)
320 value_ptr array, element;
321 register struct expression *exp;
326 int element_size = TYPE_LENGTH (VALUE_TYPE (element));
327 if (exp->elts[*pos].opcode == BINOP_COMMA)
330 init_array_element (array, element, exp, pos, noside,
331 low_bound, high_bound);
332 return init_array_element (array, element,
333 exp, pos, noside, low_bound, high_bound);
335 else if (exp->elts[*pos].opcode == BINOP_RANGE)
339 low = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
340 high = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
341 if (low < low_bound || high > high_bound)
342 error ("tuple range index out of range");
343 for (index = low ; index <= high; index++)
345 memcpy (VALUE_CONTENTS_RAW (array)
346 + (index - low_bound) * element_size,
347 VALUE_CONTENTS (element), element_size);
352 index = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
353 if (index < low_bound || index > high_bound)
354 error ("tuple index out of range");
355 memcpy (VALUE_CONTENTS_RAW (array) + (index - low_bound) * element_size,
356 VALUE_CONTENTS (element), element_size);
362 evaluate_subexp_standard (expect_type, exp, pos, noside)
363 struct type *expect_type;
364 register struct expression *exp;
370 register int pc, pc2 = 0, oldpos;
371 register value_ptr arg1 = NULL, arg2 = NULL, arg3;
375 int upper, lower, retcode;
378 /* This expect_type crap should not be used for C. C expressions do
379 not have any notion of expected types, never has and (goddess
380 willing) never will. The C++ code uses it for some twisted
381 purpose (I haven't investigated but I suspect it just the usual
382 combination of Stroustrup figuring out some crazy language
383 feature and Tiemann figuring out some crazier way to try to
384 implement it). CHILL has the tuple stuff; I don't know enough
385 about CHILL to know whether expected types is the way to do it.
386 FORTRAN I don't know. */
387 if (exp->language_defn->la_language != language_cplus
388 && exp->language_defn->la_language != language_chill)
389 expect_type = NULL_TYPE;
392 op = exp->elts[pc].opcode;
397 tem = longest_to_int (exp->elts[pc + 2].longconst);
398 (*pos) += 4 + BYTES_TO_EXP_ELEM (tem + 1);
399 arg1 = value_struct_elt_for_reference (exp->elts[pc + 1].type,
401 exp->elts[pc + 1].type,
402 &exp->elts[pc + 3].string,
405 error ("There is no field named %s", &exp->elts[pc + 3].string);
410 return value_from_longest (exp->elts[pc + 1].type,
411 exp->elts[pc + 2].longconst);
415 return value_from_double (exp->elts[pc + 1].type,
416 exp->elts[pc + 2].doubleconst);
420 if (noside == EVAL_SKIP)
422 if (noside == EVAL_AVOID_SIDE_EFFECTS)
424 struct symbol * sym = exp->elts[pc + 2].symbol;
427 switch (SYMBOL_CLASS (sym))
431 case LOC_CONST_BYTES:
445 return value_zero (SYMBOL_TYPE (sym), lv);
448 return value_of_variable (exp->elts[pc + 2].symbol,
449 exp->elts[pc + 1].block);
454 access_value_history (longest_to_int (exp->elts[pc + 1].longconst));
458 return value_of_register (longest_to_int (exp->elts[pc + 1].longconst));
462 return value_from_longest (LA_BOOL_TYPE,
463 exp->elts[pc + 1].longconst);
467 return value_of_internalvar (exp->elts[pc + 1].internalvar);
470 tem = longest_to_int (exp->elts[pc + 1].longconst);
471 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
472 if (noside == EVAL_SKIP)
474 return value_string (&exp->elts[pc + 2].string, tem);
477 tem = longest_to_int (exp->elts[pc + 1].longconst);
479 += 3 + BYTES_TO_EXP_ELEM ((tem + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
480 if (noside == EVAL_SKIP)
482 return value_bitstring (&exp->elts[pc + 2].string, tem);
487 tem2 = longest_to_int (exp->elts[pc + 1].longconst);
488 tem3 = longest_to_int (exp->elts[pc + 2].longconst);
489 nargs = tem3 - tem2 + 1;
490 type = expect_type ? check_typedef (expect_type) : NULL_TYPE;
492 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
493 && TYPE_CODE (type) == TYPE_CODE_STRUCT)
495 value_ptr rec = allocate_value (expect_type);
496 memset (VALUE_CONTENTS_RAW (rec), '\0', TYPE_LENGTH (type));
497 return evaluate_struct_tuple (rec, exp, pos, noside, nargs);
500 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
501 && TYPE_CODE (type) == TYPE_CODE_ARRAY)
503 struct type *range_type = TYPE_FIELD_TYPE (type, 0);
504 struct type *element_type = TYPE_TARGET_TYPE (type);
505 value_ptr array = allocate_value (expect_type);
506 int element_size = TYPE_LENGTH (check_typedef (element_type));
507 LONGEST low_bound, high_bound, index;
508 if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
511 high_bound = (TYPE_LENGTH (type) / element_size) - 1;
514 memset (VALUE_CONTENTS_RAW (array), 0, TYPE_LENGTH (expect_type));
515 for (tem = nargs; --nargs >= 0; )
519 if (exp->elts[*pos].opcode == BINOP_RANGE)
522 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
524 element = evaluate_subexp (element_type, exp, pos, noside);
525 if (VALUE_TYPE (element) != element_type)
526 element = value_cast (element_type, element);
529 int continue_pc = *pos;
531 index = init_array_element (array, element, exp, pos, noside,
532 low_bound, high_bound);
537 memcpy (VALUE_CONTENTS_RAW (array)
538 + (index - low_bound) * element_size,
539 VALUE_CONTENTS (element),
547 if (expect_type != NULL_TYPE && noside != EVAL_SKIP
548 && TYPE_CODE (type) == TYPE_CODE_SET)
550 value_ptr set = allocate_value (expect_type);
551 char *valaddr = VALUE_CONTENTS_RAW (set);
552 struct type *element_type = TYPE_INDEX_TYPE (type);
553 struct type *check_type = element_type;
554 LONGEST low_bound, high_bound;
556 /* get targettype of elementtype */
557 while (TYPE_CODE (check_type) == TYPE_CODE_RANGE ||
558 TYPE_CODE (check_type) == TYPE_CODE_TYPEDEF)
559 check_type = TYPE_TARGET_TYPE (check_type);
561 if (get_discrete_bounds (element_type, &low_bound, &high_bound) < 0)
562 error ("(power)set type with unknown size");
563 memset (valaddr, '\0', TYPE_LENGTH (type));
564 for (tem = 0; tem < nargs; tem++)
566 LONGEST range_low, range_high;
567 struct type *range_low_type, *range_high_type;
569 if (exp->elts[*pos].opcode == BINOP_RANGE)
572 elem_val = evaluate_subexp (element_type, exp, pos, noside);
573 range_low_type = VALUE_TYPE (elem_val);
574 range_low = value_as_long (elem_val);
575 elem_val = evaluate_subexp (element_type, exp, pos, noside);
576 range_high_type = VALUE_TYPE (elem_val);
577 range_high = value_as_long (elem_val);
581 elem_val = evaluate_subexp (element_type, exp, pos, noside);
582 range_low_type = range_high_type = VALUE_TYPE (elem_val);
583 range_low = range_high = value_as_long (elem_val);
585 /* check types of elements to avoid mixture of elements from
586 different types. Also check if type of element is "compatible"
587 with element type of powerset */
588 if (TYPE_CODE (range_low_type) == TYPE_CODE_RANGE)
589 range_low_type = TYPE_TARGET_TYPE (range_low_type);
590 if (TYPE_CODE (range_high_type) == TYPE_CODE_RANGE)
591 range_high_type = TYPE_TARGET_TYPE (range_high_type);
592 if ((TYPE_CODE (range_low_type) != TYPE_CODE (range_high_type)) ||
593 (TYPE_CODE (range_low_type) == TYPE_CODE_ENUM &&
594 (range_low_type != range_high_type)))
595 /* different element modes */
596 error ("POWERSET tuple elements of different mode");
597 if ((TYPE_CODE (check_type) != TYPE_CODE (range_low_type)) ||
598 (TYPE_CODE (check_type) == TYPE_CODE_ENUM &&
599 range_low_type != check_type))
600 error ("incompatible POWERSET tuple elements");
601 if (range_low > range_high)
603 warning ("empty POWERSET tuple range");
606 if (range_low < low_bound || range_high > high_bound)
607 error ("POWERSET tuple element out of range");
608 range_low -= low_bound;
609 range_high -= low_bound;
610 for ( ; range_low <= range_high; range_low++)
612 int bit_index = (unsigned) range_low % TARGET_CHAR_BIT;
614 bit_index = TARGET_CHAR_BIT - 1 - bit_index;
615 valaddr [(unsigned) range_low / TARGET_CHAR_BIT]
622 argvec = (value_ptr *) alloca (sizeof (value_ptr) * nargs);
623 for (tem = 0; tem < nargs; tem++)
625 /* Ensure that array expressions are coerced into pointer objects. */
626 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
628 if (noside == EVAL_SKIP)
630 return value_array (tem2, tem3, argvec);
634 value_ptr array = evaluate_subexp (NULL_TYPE, exp, pos, noside);
636 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
638 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
639 if (noside == EVAL_SKIP)
641 return value_slice (array, lowbound, upper - lowbound + 1);
644 case TERNOP_SLICE_COUNT:
646 value_ptr array = evaluate_subexp (NULL_TYPE, exp, pos, noside);
648 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
650 = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
651 return value_slice (array, lowbound, length);
655 /* Skip third and second args to evaluate the first one. */
656 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
657 if (value_logical_not (arg1))
659 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
660 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
664 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
665 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
671 op = exp->elts[*pos].opcode;
672 nargs = longest_to_int (exp->elts[pc + 1].longconst);
673 /* Allocate arg vector, including space for the function to be
674 called in argvec[0] and a terminating NULL */
675 argvec = (value_ptr *) alloca (sizeof (value_ptr) * (nargs + 3));
676 if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
681 /* First, evaluate the structure into arg2 */
684 if (noside == EVAL_SKIP)
687 if (op == STRUCTOP_MEMBER)
689 arg2 = evaluate_subexp_for_address (exp, pos, noside);
693 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
696 /* If the function is a virtual function, then the
697 aggregate value (providing the structure) plays
698 its part by providing the vtable. Otherwise,
699 it is just along for the ride: call the function
702 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
704 fnptr = value_as_long (arg1);
706 if (METHOD_PTR_IS_VIRTUAL(fnptr))
708 int fnoffset = METHOD_PTR_TO_VOFFSET(fnptr);
709 struct type *basetype;
710 struct type *domain_type =
711 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)));
713 basetype = TYPE_TARGET_TYPE (VALUE_TYPE (arg2));
714 if (domain_type != basetype)
715 arg2 = value_cast(lookup_pointer_type (domain_type), arg2);
716 basetype = TYPE_VPTR_BASETYPE (domain_type);
717 for (i = TYPE_NFN_FIELDS (basetype) - 1; i >= 0; i--)
719 struct fn_field *f = TYPE_FN_FIELDLIST1 (basetype, i);
720 /* If one is virtual, then all are virtual. */
721 if (TYPE_FN_FIELD_VIRTUAL_P (f, 0))
722 for (j = TYPE_FN_FIELDLIST_LENGTH (basetype, i) - 1; j >= 0; --j)
723 if ((int) TYPE_FN_FIELD_VOFFSET (f, j) == fnoffset)
725 value_ptr temp = value_ind (arg2);
726 arg1 = value_virtual_fn_field (&temp, f, j, domain_type, 0);
727 arg2 = value_addr (temp);
732 error ("virtual function at index %d not found", fnoffset);
736 VALUE_TYPE (arg1) = lookup_pointer_type (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)));
740 /* Now, say which argument to start evaluating from */
743 else if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
745 /* Hair for method invocations */
749 /* First, evaluate the structure into arg2 */
751 tem2 = longest_to_int (exp->elts[pc2 + 1].longconst);
752 *pos += 3 + BYTES_TO_EXP_ELEM (tem2 + 1);
753 if (noside == EVAL_SKIP)
756 if (op == STRUCTOP_STRUCT)
758 /* If v is a variable in a register, and the user types
759 v.method (), this will produce an error, because v has
762 A possible way around this would be to allocate a
763 copy of the variable on the stack, copy in the
764 contents, call the function, and copy out the
765 contents. I.e. convert this from call by reference
766 to call by copy-return (or whatever it's called).
767 However, this does not work because it is not the
768 same: the method being called could stash a copy of
769 the address, and then future uses through that address
770 (after the method returns) would be expected to
771 use the variable itself, not some copy of it. */
772 arg2 = evaluate_subexp_for_address (exp, pos, noside);
776 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
778 /* Now, say which argument to start evaluating from */
783 argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside);
785 type = VALUE_TYPE (argvec[0]);
786 if (type && TYPE_CODE (type) == TYPE_CODE_PTR)
787 type = TYPE_TARGET_TYPE (type);
788 if (type && TYPE_CODE (type) == TYPE_CODE_FUNC)
790 for (; tem <= nargs && tem <= TYPE_NFIELDS (type); tem++)
792 argvec[tem] = evaluate_subexp (TYPE_FIELD_TYPE (type, tem-1),
798 for (; tem <= nargs; tem++)
800 /* Ensure that array expressions are coerced into pointer objects. */
802 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
805 /* signal end of arglist */
808 if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR)
811 value_ptr temp = arg2;
816 strcpy(tstr, &exp->elts[pc2+2].string);
821 value_struct_elt (&temp, argvec+1, tstr,
823 op == STRUCTOP_STRUCT
824 ? "structure" : "structure pointer");
826 arg2 = value_from_longest (lookup_pointer_type(VALUE_TYPE (temp)),
827 VALUE_ADDRESS (temp)+VALUE_OFFSET (temp));
832 argvec[1] = argvec[0];
837 else if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR)
845 if (noside == EVAL_SKIP)
847 if (noside == EVAL_AVOID_SIDE_EFFECTS)
849 /* If the return type doesn't look like a function type, call an
850 error. This can happen if somebody tries to turn a variable into
851 a function call. This is here because people often want to
852 call, eg, strcmp, which gdb doesn't know is a function. If
853 gdb isn't asked for it's opinion (ie. through "whatis"),
854 it won't offer it. */
857 TYPE_TARGET_TYPE (VALUE_TYPE (argvec[0]));
860 return allocate_value (TYPE_TARGET_TYPE (VALUE_TYPE (argvec[0])));
862 error ("Expression of type other than \"Function returning ...\" used as function");
864 return call_function_by_hand (argvec[0], nargs, argvec + 1);
866 case OP_F77_UNDETERMINED_ARGLIST:
868 /* Remember that in F77, functions, substring ops and
869 array subscript operations cannot be disambiguated
870 at parse time. We have made all array subscript operations,
871 substring operations as well as function calls come here
872 and we now have to discover what the heck this thing actually was.
873 If it is a function, we process just as if we got an OP_FUNCALL. */
875 nargs = longest_to_int (exp->elts[pc+1].longconst);
878 /* First determine the type code we are dealing with. */
879 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
880 type = check_typedef (VALUE_TYPE (arg1));
881 code = TYPE_CODE (type);
885 case TYPE_CODE_ARRAY:
886 goto multi_f77_subscript;
888 case TYPE_CODE_STRING:
893 /* It's a function call. */
894 /* Allocate arg vector, including space for the function to be
895 called in argvec[0] and a terminating NULL */
896 argvec = (value_ptr *) alloca (sizeof (value_ptr) * (nargs + 2));
899 for (; tem <= nargs; tem++)
900 argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside);
901 argvec[tem] = 0; /* signal end of arglist */
905 error ("Cannot perform substring on this type");
909 /* We have a substring operation on our hands here,
910 let us get the string we will be dealing with */
912 /* Now evaluate the 'from' and 'to' */
914 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
917 return value_subscript (arg1, arg2);
919 arg3 = evaluate_subexp_with_coercion (exp, pos, noside);
921 if (noside == EVAL_SKIP)
924 tem2 = value_as_long (arg2);
925 tem3 = value_as_long (arg3);
927 return value_slice (arg1, tem2, tem3 - tem2 + 1);
930 /* We have a complex number, There should be 2 floating
931 point numbers that compose it */
932 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
933 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
935 return value_literal_complex (arg1, arg2, builtin_type_f_complex_s16);
937 case STRUCTOP_STRUCT:
938 tem = longest_to_int (exp->elts[pc + 1].longconst);
939 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
940 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
941 if (noside == EVAL_SKIP)
943 if (noside == EVAL_AVOID_SIDE_EFFECTS)
944 return value_zero (lookup_struct_elt_type (VALUE_TYPE (arg1),
945 &exp->elts[pc + 2].string,
950 value_ptr temp = arg1;
951 return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
956 tem = longest_to_int (exp->elts[pc + 1].longconst);
957 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
958 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
959 if (noside == EVAL_SKIP)
961 if (noside == EVAL_AVOID_SIDE_EFFECTS)
962 return value_zero (lookup_struct_elt_type (VALUE_TYPE (arg1),
963 &exp->elts[pc + 2].string,
968 value_ptr temp = arg1;
969 return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
970 NULL, "structure pointer");
973 /* start-sanitize-gm */
976 tem = longest_to_int (exp->elts[pc + 1].longconst);
977 (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
978 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
979 if (noside == EVAL_SKIP)
982 CORE_ADDR object = value_as_long (arg1);
983 struct type *type = type_of_object (object);
985 if (noside == EVAL_AVOID_SIDE_EFFECTS)
986 return value_zero (lookup_struct_elt_type (type,
987 &exp->elts[pc + 2].string,
992 value_ptr temp = value_from_longest (builtin_type_unsigned_long,
993 baseptr_of_object (value_as_long(arg1)));
995 VALUE_TYPE (temp) = type;
996 return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string,
997 NULL, "structure pointer");
1000 #endif /* GENERAL_MAGIC */
1001 /* end-sanitize-gm */
1003 case STRUCTOP_MEMBER:
1004 arg1 = evaluate_subexp_for_address (exp, pos, noside);
1005 goto handle_pointer_to_member;
1007 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1008 handle_pointer_to_member:
1009 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1010 if (noside == EVAL_SKIP)
1012 type = check_typedef (VALUE_TYPE (arg2));
1013 if (TYPE_CODE (type) != TYPE_CODE_PTR)
1014 goto bad_pointer_to_member;
1015 type = check_typedef (TYPE_TARGET_TYPE (type));
1016 if (TYPE_CODE (type) == TYPE_CODE_METHOD)
1017 error ("not implemented: pointer-to-method in pointer-to-member construct");
1018 if (TYPE_CODE (type) != TYPE_CODE_MEMBER)
1019 goto bad_pointer_to_member;
1020 /* Now, convert these values to an address. */
1021 arg1 = value_cast (lookup_pointer_type (TYPE_DOMAIN_TYPE (type)),
1023 arg3 = value_from_longest (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
1024 value_as_long (arg1) + value_as_long (arg2));
1025 return value_ind (arg3);
1026 bad_pointer_to_member:
1027 error("non-pointer-to-member value used in pointer-to-member construct");
1030 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1031 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1032 if (noside == EVAL_SKIP)
1034 if (binop_user_defined_p (op, arg1, arg2))
1035 return value_x_binop (arg1, arg2, op, OP_NULL);
1037 return value_concat (arg1, arg2);
1040 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1041 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1042 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1044 if (binop_user_defined_p (op, arg1, arg2))
1045 return value_x_binop (arg1, arg2, op, OP_NULL);
1047 return value_assign (arg1, arg2);
1049 case BINOP_ASSIGN_MODIFY:
1051 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1052 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1053 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1055 op = exp->elts[pc + 1].opcode;
1056 if (binop_user_defined_p (op, arg1, arg2))
1057 return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op);
1058 else if (op == BINOP_ADD)
1059 arg2 = value_add (arg1, arg2);
1060 else if (op == BINOP_SUB)
1061 arg2 = value_sub (arg1, arg2);
1063 arg2 = value_binop (arg1, arg2, op);
1064 return value_assign (arg1, arg2);
1067 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1068 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1069 if (noside == EVAL_SKIP)
1071 if (binop_user_defined_p (op, arg1, arg2))
1072 return value_x_binop (arg1, arg2, op, OP_NULL);
1074 return value_add (arg1, arg2);
1077 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1078 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1079 if (noside == EVAL_SKIP)
1081 if (binop_user_defined_p (op, arg1, arg2))
1082 return value_x_binop (arg1, arg2, op, OP_NULL);
1084 return value_sub (arg1, arg2);
1092 case BINOP_BITWISE_AND:
1093 case BINOP_BITWISE_IOR:
1094 case BINOP_BITWISE_XOR:
1095 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1096 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1097 if (noside == EVAL_SKIP)
1099 if (binop_user_defined_p (op, arg1, arg2))
1100 return value_x_binop (arg1, arg2, op, OP_NULL);
1102 if (noside == EVAL_AVOID_SIDE_EFFECTS
1103 && (op == BINOP_DIV || op == BINOP_REM || op == BINOP_MOD))
1104 return value_zero (VALUE_TYPE (arg1), not_lval);
1106 return value_binop (arg1, arg2, op);
1109 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1110 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1111 if (noside == EVAL_SKIP)
1113 error ("':' operator used in invalid context");
1115 case BINOP_SUBSCRIPT:
1116 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1117 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1118 if (noside == EVAL_SKIP)
1120 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1122 /* If the user attempts to subscript something that has no target
1123 type (like a plain int variable for example), then report this
1126 type = TYPE_TARGET_TYPE (check_typedef (VALUE_TYPE (arg1)));
1128 return value_zero (type, VALUE_LVAL (arg1));
1130 error ("cannot subscript something of type `%s'",
1131 TYPE_NAME (VALUE_TYPE (arg1)));
1134 if (binop_user_defined_p (op, arg1, arg2))
1135 return value_x_binop (arg1, arg2, op, OP_NULL);
1137 return value_subscript (arg1, arg2);
1140 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1141 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1142 if (noside == EVAL_SKIP)
1144 return value_in (arg1, arg2);
1146 case MULTI_SUBSCRIPT:
1148 nargs = longest_to_int (exp->elts[pc + 1].longconst);
1149 arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
1152 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1153 /* FIXME: EVAL_SKIP handling may not be correct. */
1154 if (noside == EVAL_SKIP)
1165 /* FIXME: EVAL_AVOID_SIDE_EFFECTS handling may not be correct. */
1166 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1168 /* If the user attempts to subscript something that has no target
1169 type (like a plain int variable for example), then report this
1172 type = TYPE_TARGET_TYPE (check_typedef (VALUE_TYPE (arg1)));
1175 arg1 = value_zero (type, VALUE_LVAL (arg1));
1181 error ("cannot subscript something of type `%s'",
1182 TYPE_NAME (VALUE_TYPE (arg1)));
1186 if (binop_user_defined_p (op, arg1, arg2))
1188 arg1 = value_x_binop (arg1, arg2, op, OP_NULL);
1192 arg1 = value_subscript (arg1, arg2);
1197 multi_f77_subscript:
1199 int subscript_array[MAX_FORTRAN_DIMS+1]; /* 1-based array of
1200 subscripts, max == 7 */
1201 int array_size_array[MAX_FORTRAN_DIMS+1];
1202 int ndimensions=1,i;
1203 struct type *tmp_type;
1204 int offset_item; /* The array offset where the item lives */
1206 if (nargs > MAX_FORTRAN_DIMS)
1207 error ("Too many subscripts for F77 (%d Max)", MAX_FORTRAN_DIMS);
1209 tmp_type = check_typedef (VALUE_TYPE (arg1));
1210 ndimensions = calc_f77_array_dims (type);
1212 if (nargs != ndimensions)
1213 error ("Wrong number of subscripts");
1215 /* Now that we know we have a legal array subscript expression
1216 let us actually find out where this element exists in the array. */
1219 for (i = 1; i <= nargs; i++)
1221 /* Evaluate each subscript, It must be a legal integer in F77 */
1222 arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
1224 /* Fill in the subscript and array size arrays */
1226 subscript_array[i] = value_as_long (arg2);
1228 retcode = f77_get_dynamic_upperbound (tmp_type, &upper);
1229 if (retcode == BOUND_FETCH_ERROR)
1230 error ("Cannot obtain dynamic upper bound");
1232 retcode = f77_get_dynamic_lowerbound (tmp_type, &lower);
1233 if (retcode == BOUND_FETCH_ERROR)
1234 error("Cannot obtain dynamic lower bound");
1236 array_size_array[i] = upper - lower + 1;
1238 /* Zero-normalize subscripts so that offsetting will work. */
1240 subscript_array[i] -= lower;
1242 /* If we are at the bottom of a multidimensional
1243 array type then keep a ptr to the last ARRAY
1244 type around for use when calling value_subscript()
1245 below. This is done because we pretend to value_subscript
1246 that we actually have a one-dimensional array
1247 of base element type that we apply a simple
1251 tmp_type = check_typedef (TYPE_TARGET_TYPE (tmp_type));
1254 /* Now let us calculate the offset for this item */
1256 offset_item = subscript_array[ndimensions];
1258 for (i = ndimensions - 1; i >= 1; i--)
1260 array_size_array[i] * offset_item + subscript_array[i];
1262 /* Construct a value node with the value of the offset */
1264 arg2 = value_from_longest (builtin_type_f_integer, offset_item);
1266 /* Let us now play a dirty trick: we will take arg1
1267 which is a value node pointing to the topmost level
1268 of the multidimensional array-set and pretend
1269 that it is actually a array of the final element
1270 type, this will ensure that value_subscript()
1271 returns the correct type value */
1273 VALUE_TYPE (arg1) = tmp_type;
1274 return value_ind (value_add (value_coerce_array (arg1), arg2));
1277 case BINOP_LOGICAL_AND:
1278 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1279 if (noside == EVAL_SKIP)
1281 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1286 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1289 if (binop_user_defined_p (op, arg1, arg2))
1291 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1292 return value_x_binop (arg1, arg2, op, OP_NULL);
1296 tem = value_logical_not (arg1);
1297 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
1298 (tem ? EVAL_SKIP : noside));
1299 return value_from_longest (LA_BOOL_TYPE,
1300 (LONGEST) (!tem && !value_logical_not (arg2)));
1303 case BINOP_LOGICAL_OR:
1304 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1305 if (noside == EVAL_SKIP)
1307 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1312 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1315 if (binop_user_defined_p (op, arg1, arg2))
1317 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1318 return value_x_binop (arg1, arg2, op, OP_NULL);
1322 tem = value_logical_not (arg1);
1323 arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
1324 (!tem ? EVAL_SKIP : noside));
1325 return value_from_longest (LA_BOOL_TYPE,
1326 (LONGEST) (!tem || !value_logical_not (arg2)));
1330 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1331 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1332 if (noside == EVAL_SKIP)
1334 if (binop_user_defined_p (op, arg1, arg2))
1336 return value_x_binop (arg1, arg2, op, OP_NULL);
1340 tem = value_equal (arg1, arg2);
1341 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1344 case BINOP_NOTEQUAL:
1345 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1346 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1347 if (noside == EVAL_SKIP)
1349 if (binop_user_defined_p (op, arg1, arg2))
1351 return value_x_binop (arg1, arg2, op, OP_NULL);
1355 tem = value_equal (arg1, arg2);
1356 return value_from_longest (LA_BOOL_TYPE, (LONGEST) ! tem);
1360 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1361 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1362 if (noside == EVAL_SKIP)
1364 if (binop_user_defined_p (op, arg1, arg2))
1366 return value_x_binop (arg1, arg2, op, OP_NULL);
1370 tem = value_less (arg1, arg2);
1371 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1375 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1376 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1377 if (noside == EVAL_SKIP)
1379 if (binop_user_defined_p (op, arg1, arg2))
1381 return value_x_binop (arg1, arg2, op, OP_NULL);
1385 tem = value_less (arg2, arg1);
1386 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1390 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1391 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1392 if (noside == EVAL_SKIP)
1394 if (binop_user_defined_p (op, arg1, arg2))
1396 return value_x_binop (arg1, arg2, op, OP_NULL);
1400 tem = value_less (arg2, arg1) || value_equal (arg1, arg2);
1401 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1405 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1406 arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside);
1407 if (noside == EVAL_SKIP)
1409 if (binop_user_defined_p (op, arg1, arg2))
1411 return value_x_binop (arg1, arg2, op, OP_NULL);
1415 tem = value_less (arg1, arg2) || value_equal (arg1, arg2);
1416 return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem);
1420 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1421 arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1422 if (noside == EVAL_SKIP)
1424 if (TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_INT)
1425 error ("Non-integral right operand for \"@\" operator.");
1426 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1428 return allocate_repeat_value (VALUE_TYPE (arg1),
1429 longest_to_int (value_as_long (arg2)));
1432 return value_repeat (arg1, longest_to_int (value_as_long (arg2)));
1435 evaluate_subexp (NULL_TYPE, exp, pos, noside);
1436 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
1439 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1440 if (noside == EVAL_SKIP)
1442 if (unop_user_defined_p (op, arg1))
1443 return value_x_unop (arg1, op);
1445 return value_neg (arg1);
1447 case UNOP_COMPLEMENT:
1448 /* C++: check for and handle destructor names. */
1449 op = exp->elts[*pos].opcode;
1451 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1452 if (noside == EVAL_SKIP)
1454 if (unop_user_defined_p (UNOP_COMPLEMENT, arg1))
1455 return value_x_unop (arg1, UNOP_COMPLEMENT);
1457 return value_complement (arg1);
1459 case UNOP_LOGICAL_NOT:
1460 arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1461 if (noside == EVAL_SKIP)
1463 if (unop_user_defined_p (op, arg1))
1464 return value_x_unop (arg1, op);
1466 return value_from_longest (builtin_type_int,
1467 (LONGEST) value_logical_not (arg1));
1470 if (expect_type && TYPE_CODE (expect_type) == TYPE_CODE_PTR)
1471 expect_type = TYPE_TARGET_TYPE (check_typedef (expect_type));
1472 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1473 if (noside == EVAL_SKIP)
1475 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1477 type = check_typedef (VALUE_TYPE (arg1));
1478 if (TYPE_CODE (type) == TYPE_CODE_PTR
1479 || TYPE_CODE (type) == TYPE_CODE_REF
1480 /* In C you can dereference an array to get the 1st elt. */
1481 || TYPE_CODE (type) == TYPE_CODE_ARRAY
1483 return value_zero (TYPE_TARGET_TYPE (type),
1485 else if (TYPE_CODE (type) == TYPE_CODE_INT)
1486 /* GDB allows dereferencing an int. */
1487 return value_zero (builtin_type_int, lval_memory);
1489 error ("Attempt to take contents of a non-pointer value.");
1491 return value_ind (arg1);
1494 /* C++: check for and handle pointer to members. */
1496 op = exp->elts[*pos].opcode;
1498 if (noside == EVAL_SKIP)
1502 int temm = longest_to_int (exp->elts[pc+3].longconst);
1503 (*pos) += 3 + BYTES_TO_EXP_ELEM (temm + 1);
1506 evaluate_subexp (expect_type, exp, pos, EVAL_SKIP);
1510 return evaluate_subexp_for_address (exp, pos, noside);
1513 if (noside == EVAL_SKIP)
1515 evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP);
1518 return evaluate_subexp_for_sizeof (exp, pos);
1522 type = exp->elts[pc + 1].type;
1523 arg1 = evaluate_subexp (type, exp, pos, noside);
1524 if (noside == EVAL_SKIP)
1526 if (type != VALUE_TYPE (arg1))
1527 arg1 = value_cast (type, arg1);
1532 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1533 if (noside == EVAL_SKIP)
1535 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1536 return value_zero (exp->elts[pc + 1].type, lval_memory);
1538 return value_at_lazy (exp->elts[pc + 1].type,
1539 value_as_pointer (arg1));
1541 case UNOP_PREINCREMENT:
1542 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1543 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1545 else if (unop_user_defined_p (op, arg1))
1547 return value_x_unop (arg1, op);
1551 arg2 = value_add (arg1, value_from_longest (builtin_type_char,
1553 return value_assign (arg1, arg2);
1556 case UNOP_PREDECREMENT:
1557 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1558 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1560 else if (unop_user_defined_p (op, arg1))
1562 return value_x_unop (arg1, op);
1566 arg2 = value_sub (arg1, value_from_longest (builtin_type_char,
1568 return value_assign (arg1, arg2);
1571 case UNOP_POSTINCREMENT:
1572 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1573 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1575 else if (unop_user_defined_p (op, arg1))
1577 return value_x_unop (arg1, op);
1581 arg2 = value_add (arg1, value_from_longest (builtin_type_char,
1583 value_assign (arg1, arg2);
1587 case UNOP_POSTDECREMENT:
1588 arg1 = evaluate_subexp (expect_type, exp, pos, noside);
1589 if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
1591 else if (unop_user_defined_p (op, arg1))
1593 return value_x_unop (arg1, op);
1597 arg2 = value_sub (arg1, value_from_longest (builtin_type_char,
1599 value_assign (arg1, arg2);
1605 return value_of_this (1);
1608 error ("Attempt to use a type name as an expression");
1611 /* Removing this case and compiling with gcc -Wall reveals that
1612 a lot of cases are hitting this case. Some of these should
1613 probably be removed from expression.h (e.g. do we need a BINOP_SCOPE
1614 and an OP_SCOPE?); others are legitimate expressions which are
1615 (apparently) not fully implemented.
1617 If there are any cases landing here which mean a user error,
1618 then they should be separate cases, with more descriptive
1622 GDB does not (yet) know how to evaluate that kind of expression");
1626 return value_from_longest (builtin_type_long, (LONGEST) 1);
1629 /* Evaluate a subexpression of EXP, at index *POS,
1630 and return the address of that subexpression.
1631 Advance *POS over the subexpression.
1632 If the subexpression isn't an lvalue, get an error.
1633 NOSIDE may be EVAL_AVOID_SIDE_EFFECTS;
1634 then only the type of the result need be correct. */
1637 evaluate_subexp_for_address (exp, pos, noside)
1638 register struct expression *exp;
1647 op = exp->elts[pc].opcode;
1653 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
1657 return value_cast (lookup_pointer_type (exp->elts[pc + 1].type),
1658 evaluate_subexp (NULL_TYPE, exp, pos, noside));
1661 var = exp->elts[pc + 2].symbol;
1663 /* C++: The "address" of a reference should yield the address
1664 * of the object pointed to. Let value_addr() deal with it. */
1665 if (TYPE_CODE (SYMBOL_TYPE (var)) == TYPE_CODE_REF)
1669 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1672 lookup_pointer_type (SYMBOL_TYPE (var));
1673 enum address_class sym_class = SYMBOL_CLASS (var);
1675 if (sym_class == LOC_CONST
1676 || sym_class == LOC_CONST_BYTES
1677 || sym_class == LOC_REGISTER
1678 || sym_class == LOC_REGPARM)
1679 error ("Attempt to take address of register or constant.");
1682 value_zero (type, not_lval);
1688 block_innermost_frame (exp->elts[pc + 1].block));
1692 if (noside == EVAL_AVOID_SIDE_EFFECTS)
1694 value_ptr x = evaluate_subexp (NULL_TYPE, exp, pos, noside);
1695 if (VALUE_LVAL (x) == lval_memory)
1696 return value_zero (lookup_pointer_type (VALUE_TYPE (x)),
1699 error ("Attempt to take address of non-lval");
1701 return value_addr (evaluate_subexp (NULL_TYPE, exp, pos, noside));
1705 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
1706 When used in contexts where arrays will be coerced anyway, this is
1707 equivalent to `evaluate_subexp' but much faster because it avoids
1708 actually fetching array contents (perhaps obsolete now that we have
1711 Note that we currently only do the coercion for C expressions, where
1712 arrays are zero based and the coercion is correct. For other languages,
1713 with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION
1714 to decide if coercion is appropriate.
1719 evaluate_subexp_with_coercion (exp, pos, noside)
1720 register struct expression *exp;
1724 register enum exp_opcode op;
1726 register value_ptr val;
1730 op = exp->elts[pc].opcode;
1735 var = exp->elts[pc + 2].symbol;
1736 if (TYPE_CODE (check_typedef (SYMBOL_TYPE (var))) == TYPE_CODE_ARRAY
1737 && CAST_IS_CONVERSION)
1742 (var, block_innermost_frame (exp->elts[pc + 1].block));
1743 return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (SYMBOL_TYPE (var))),
1749 return evaluate_subexp (NULL_TYPE, exp, pos, noside);
1753 /* Evaluate a subexpression of EXP, at index *POS,
1754 and return a value for the size of that subexpression.
1755 Advance *POS over the subexpression. */
1758 evaluate_subexp_for_sizeof (exp, pos)
1759 register struct expression *exp;
1768 op = exp->elts[pc].opcode;
1772 /* This case is handled specially
1773 so that we avoid creating a value for the result type.
1774 If the result type is very big, it's desirable not to
1775 create a value unnecessarily. */
1778 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1779 type = check_typedef (VALUE_TYPE (val));
1780 type = check_typedef (TYPE_TARGET_TYPE (type));
1781 return value_from_longest (builtin_type_int, (LONGEST)
1782 TYPE_LENGTH (type));
1786 type = check_typedef (exp->elts[pc + 1].type);
1787 return value_from_longest (builtin_type_int,
1788 (LONGEST) TYPE_LENGTH (type));
1792 type = check_typedef (SYMBOL_TYPE (exp->elts[pc + 2].symbol));
1794 value_from_longest (builtin_type_int, (LONGEST) TYPE_LENGTH (type));
1797 val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
1798 return value_from_longest (builtin_type_int,
1799 (LONGEST) TYPE_LENGTH (VALUE_TYPE (val)));
1803 /* Parse a type expression in the string [P..P+LENGTH). */
1806 parse_and_eval_type (p, length)
1810 char *tmp = (char *)alloca (length + 4);
1811 struct expression *expr;
1813 memcpy (tmp+1, p, length);
1814 tmp[length+1] = ')';
1815 tmp[length+2] = '0';
1816 tmp[length+3] = '\0';
1817 expr = parse_expression (tmp);
1818 if (expr->elts[0].opcode != UNOP_CAST)
1819 error ("Internal error in eval_type.");
1820 return expr->elts[1].type;
1824 calc_f77_array_dims (array_type)
1825 struct type *array_type;
1828 struct type *tmp_type;
1830 if ((TYPE_CODE(array_type) != TYPE_CODE_ARRAY))
1831 error ("Can't get dimensions for a non-array type");
1833 tmp_type = array_type;
1835 while ((tmp_type = TYPE_TARGET_TYPE (tmp_type)))
1837 if (TYPE_CODE (tmp_type) == TYPE_CODE_ARRAY)