1 /* Evaluate expressions for GDB.
3 Copyright (C) 1986-2021 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 3 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, see <http://www.gnu.org/licenses/>. */
24 #include "expression.h"
27 #include "gdbthread.h"
28 #include "language.h" /* For CAST_IS_CONVERSION. */
31 #include "objc-lang.h"
33 #include "parser-defs.h"
34 #include "cp-support.h"
37 #include "user-regs.h"
39 #include "gdb_obstack.h"
41 #include "typeprint.h"
44 /* Prototypes for local functions. */
46 static struct value
*evaluate_subexp_for_sizeof (struct expression
*, int *,
49 static struct value
*evaluate_subexp_for_address (struct expression
*,
52 static value
*evaluate_subexp_for_cast (expression
*exp
, int *pos
,
56 static struct value
*evaluate_struct_tuple (struct value
*,
57 struct expression
*, int *,
61 evaluate_subexp (struct type
*expect_type
, struct expression
*exp
,
62 int *pos
, enum noside noside
)
64 return ((*exp
->language_defn
->expression_ops ()->evaluate_exp
)
65 (expect_type
, exp
, pos
, noside
));
68 /* Parse the string EXP as a C expression, evaluate it,
69 and return the result as a number. */
72 parse_and_eval_address (const char *exp
)
74 expression_up expr
= parse_expression (exp
);
76 return value_as_address (evaluate_expression (expr
.get ()));
79 /* Like parse_and_eval_address, but treats the value of the expression
80 as an integer, not an address, returns a LONGEST, not a CORE_ADDR. */
82 parse_and_eval_long (const char *exp
)
84 expression_up expr
= parse_expression (exp
);
86 return value_as_long (evaluate_expression (expr
.get ()));
90 parse_and_eval (const char *exp
)
92 expression_up expr
= parse_expression (exp
);
94 return evaluate_expression (expr
.get ());
97 /* Parse up to a comma (or to a closeparen)
98 in the string EXPP as an expression, evaluate it, and return the value.
99 EXPP is advanced to point to the comma. */
102 parse_to_comma_and_eval (const char **expp
)
104 expression_up expr
= parse_exp_1 (expp
, 0, nullptr, 1);
106 return evaluate_expression (expr
.get ());
110 /* See expression.h. */
113 expression::evaluate (struct type
*expect_type
, enum noside noside
)
115 gdb::optional
<enable_thread_stack_temporaries
> stack_temporaries
;
116 if (target_has_execution ()
117 && language_defn
->la_language
== language_cplus
118 && !thread_stack_temporaries_enabled_p (inferior_thread ()))
119 stack_temporaries
.emplace (inferior_thread ());
122 struct value
*retval
= evaluate_subexp (expect_type
, this, &pos
, noside
);
124 if (stack_temporaries
.has_value ()
125 && value_in_thread_stack_temporaries (retval
, inferior_thread ()))
126 retval
= value_non_lval (retval
);
134 evaluate_expression (struct expression
*exp
, struct type
*expect_type
)
136 return exp
->evaluate (expect_type
, EVAL_NORMAL
);
139 /* Evaluate an expression, avoiding all memory references
140 and getting a value whose type alone is correct. */
143 evaluate_type (struct expression
*exp
)
145 return exp
->evaluate (nullptr, EVAL_AVOID_SIDE_EFFECTS
);
148 /* Evaluate a subexpression, avoiding all memory references and
149 getting a value whose type alone is correct. */
152 evaluate_subexpression_type (struct expression
*exp
, int subexp
)
154 return evaluate_subexp (nullptr, exp
, &subexp
, EVAL_AVOID_SIDE_EFFECTS
);
157 /* Find the current value of a watchpoint on EXP. Return the value in
158 *VALP and *RESULTP and the chain of intermediate and final values
159 in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does
162 If PRESERVE_ERRORS is true, then exceptions are passed through.
163 Otherwise, if PRESERVE_ERRORS is false, then if a memory error
164 occurs while evaluating the expression, *RESULTP will be set to
165 NULL. *RESULTP may be a lazy value, if the result could not be
166 read from memory. It is used to determine whether a value is
167 user-specified (we should watch the whole value) or intermediate
168 (we should watch only the bit used to locate the final value).
170 If the final value, or any intermediate value, could not be read
171 from memory, *VALP will be set to NULL. *VAL_CHAIN will still be
172 set to any referenced values. *VALP will never be a lazy value.
173 This is the value which we store in struct breakpoint.
175 If VAL_CHAIN is non-NULL, the values put into *VAL_CHAIN will be
176 released from the value chain. If VAL_CHAIN is NULL, all generated
177 values will be left on the value chain. */
180 fetch_subexp_value (struct expression
*exp
, int *pc
, struct value
**valp
,
181 struct value
**resultp
,
182 std::vector
<value_ref_ptr
> *val_chain
,
183 bool preserve_errors
)
185 struct value
*mark
, *new_mark
, *result
;
193 /* Evaluate the expression. */
194 mark
= value_mark ();
199 result
= evaluate_subexp (nullptr, exp
, pc
, EVAL_NORMAL
);
201 catch (const gdb_exception
&ex
)
203 /* Ignore memory errors if we want watchpoints pointing at
204 inaccessible memory to still be created; otherwise, throw the
205 error to some higher catcher. */
209 if (!preserve_errors
)
218 new_mark
= value_mark ();
219 if (mark
== new_mark
)
224 /* Make sure it's not lazy, so that after the target stops again we
225 have a non-lazy previous value to compare with. */
228 if (!value_lazy (result
))
235 value_fetch_lazy (result
);
238 catch (const gdb_exception_error
&except
)
246 /* Return the chain of intermediate values. We use this to
247 decide which addresses to watch. */
248 *val_chain
= value_release_to_mark (mark
);
252 /* Extract a field operation from an expression. If the subexpression
253 of EXP starting at *SUBEXP is not a structure dereference
254 operation, return NULL. Otherwise, return the name of the
255 dereferenced field, and advance *SUBEXP to point to the
256 subexpression of the left-hand-side of the dereference. This is
257 used when completing field names. */
260 extract_field_op (struct expression
*exp
, int *subexp
)
265 if (exp
->elts
[*subexp
].opcode
!= STRUCTOP_STRUCT
266 && exp
->elts
[*subexp
].opcode
!= STRUCTOP_PTR
)
268 tem
= longest_to_int (exp
->elts
[*subexp
+ 1].longconst
);
269 result
= &exp
->elts
[*subexp
+ 2].string
;
270 (*subexp
) += 1 + 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
274 /* This function evaluates brace-initializers (in C/C++) for
277 static struct value
*
278 evaluate_struct_tuple (struct value
*struct_val
,
279 struct expression
*exp
,
280 int *pos
, enum noside noside
, int nargs
)
282 struct type
*struct_type
= check_typedef (value_type (struct_val
));
283 struct type
*field_type
;
288 struct value
*val
= NULL
;
293 /* Skip static fields. */
294 while (fieldno
< struct_type
->num_fields ()
295 && field_is_static (&struct_type
->field (fieldno
)))
297 if (fieldno
>= struct_type
->num_fields ())
298 error (_("too many initializers"));
299 field_type
= struct_type
->field (fieldno
).type ();
300 if (field_type
->code () == TYPE_CODE_UNION
301 && TYPE_FIELD_NAME (struct_type
, fieldno
)[0] == '0')
302 error (_("don't know which variant you want to set"));
304 /* Here, struct_type is the type of the inner struct,
305 while substruct_type is the type of the inner struct.
306 These are the same for normal structures, but a variant struct
307 contains anonymous union fields that contain substruct fields.
308 The value fieldno is the index of the top-level (normal or
309 anonymous union) field in struct_field, while the value
310 subfieldno is the index of the actual real (named inner) field
311 in substruct_type. */
313 field_type
= struct_type
->field (fieldno
).type ();
315 val
= evaluate_subexp (field_type
, exp
, pos
, noside
);
317 /* Now actually set the field in struct_val. */
319 /* Assign val to field fieldno. */
320 if (value_type (val
) != field_type
)
321 val
= value_cast (field_type
, val
);
323 bitsize
= TYPE_FIELD_BITSIZE (struct_type
, fieldno
);
324 bitpos
= TYPE_FIELD_BITPOS (struct_type
, fieldno
);
325 addr
= value_contents_writeable (struct_val
) + bitpos
/ 8;
327 modify_field (struct_type
, addr
,
328 value_as_long (val
), bitpos
% 8, bitsize
);
330 memcpy (addr
, value_contents (val
),
331 TYPE_LENGTH (value_type (val
)));
337 /* Promote value ARG1 as appropriate before performing a unary operation
339 If the result is not appropriate for any particular language then it
340 needs to patch this function. */
343 unop_promote (const struct language_defn
*language
, struct gdbarch
*gdbarch
,
348 *arg1
= coerce_ref (*arg1
);
349 type1
= check_typedef (value_type (*arg1
));
351 if (is_integral_type (type1
))
353 switch (language
->la_language
)
356 /* Perform integral promotion for ANSI C/C++.
357 If not appropriate for any particular language
358 it needs to modify this function. */
360 struct type
*builtin_int
= builtin_type (gdbarch
)->builtin_int
;
362 if (TYPE_LENGTH (type1
) < TYPE_LENGTH (builtin_int
))
363 *arg1
= value_cast (builtin_int
, *arg1
);
370 /* Promote values ARG1 and ARG2 as appropriate before performing a binary
371 operation on those two operands.
372 If the result is not appropriate for any particular language then it
373 needs to patch this function. */
376 binop_promote (const struct language_defn
*language
, struct gdbarch
*gdbarch
,
377 struct value
**arg1
, struct value
**arg2
)
379 struct type
*promoted_type
= NULL
;
383 *arg1
= coerce_ref (*arg1
);
384 *arg2
= coerce_ref (*arg2
);
386 type1
= check_typedef (value_type (*arg1
));
387 type2
= check_typedef (value_type (*arg2
));
389 if ((type1
->code () != TYPE_CODE_FLT
390 && type1
->code () != TYPE_CODE_DECFLOAT
391 && !is_integral_type (type1
))
392 || (type2
->code () != TYPE_CODE_FLT
393 && type2
->code () != TYPE_CODE_DECFLOAT
394 && !is_integral_type (type2
)))
397 if (is_fixed_point_type (type1
) || is_fixed_point_type (type2
))
400 if (type1
->code () == TYPE_CODE_DECFLOAT
401 || type2
->code () == TYPE_CODE_DECFLOAT
)
403 /* No promotion required. */
405 else if (type1
->code () == TYPE_CODE_FLT
406 || type2
->code () == TYPE_CODE_FLT
)
408 switch (language
->la_language
)
414 case language_opencl
:
415 /* No promotion required. */
419 /* For other languages the result type is unchanged from gdb
420 version 6.7 for backward compatibility.
421 If either arg was long double, make sure that value is also long
422 double. Otherwise use double. */
423 if (TYPE_LENGTH (type1
) * 8 > gdbarch_double_bit (gdbarch
)
424 || TYPE_LENGTH (type2
) * 8 > gdbarch_double_bit (gdbarch
))
425 promoted_type
= builtin_type (gdbarch
)->builtin_long_double
;
427 promoted_type
= builtin_type (gdbarch
)->builtin_double
;
431 else if (type1
->code () == TYPE_CODE_BOOL
432 && type2
->code () == TYPE_CODE_BOOL
)
434 /* No promotion required. */
437 /* Integral operations here. */
438 /* FIXME: Also mixed integral/booleans, with result an integer. */
440 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
441 unsigned int promoted_len1
= TYPE_LENGTH (type1
);
442 unsigned int promoted_len2
= TYPE_LENGTH (type2
);
443 int is_unsigned1
= type1
->is_unsigned ();
444 int is_unsigned2
= type2
->is_unsigned ();
445 unsigned int result_len
;
446 int unsigned_operation
;
448 /* Determine type length and signedness after promotion for
450 if (promoted_len1
< TYPE_LENGTH (builtin
->builtin_int
))
453 promoted_len1
= TYPE_LENGTH (builtin
->builtin_int
);
455 if (promoted_len2
< TYPE_LENGTH (builtin
->builtin_int
))
458 promoted_len2
= TYPE_LENGTH (builtin
->builtin_int
);
461 if (promoted_len1
> promoted_len2
)
463 unsigned_operation
= is_unsigned1
;
464 result_len
= promoted_len1
;
466 else if (promoted_len2
> promoted_len1
)
468 unsigned_operation
= is_unsigned2
;
469 result_len
= promoted_len2
;
473 unsigned_operation
= is_unsigned1
|| is_unsigned2
;
474 result_len
= promoted_len1
;
477 switch (language
->la_language
)
483 if (result_len
<= TYPE_LENGTH (builtin
->builtin_int
))
485 promoted_type
= (unsigned_operation
486 ? builtin
->builtin_unsigned_int
487 : builtin
->builtin_int
);
489 else if (result_len
<= TYPE_LENGTH (builtin
->builtin_long
))
491 promoted_type
= (unsigned_operation
492 ? builtin
->builtin_unsigned_long
493 : builtin
->builtin_long
);
497 promoted_type
= (unsigned_operation
498 ? builtin
->builtin_unsigned_long_long
499 : builtin
->builtin_long_long
);
502 case language_opencl
:
503 if (result_len
<= TYPE_LENGTH (lookup_signed_typename
508 ? lookup_unsigned_typename (language
, "int")
509 : lookup_signed_typename (language
, "int"));
511 else if (result_len
<= TYPE_LENGTH (lookup_signed_typename
516 ? lookup_unsigned_typename (language
, "long")
517 : lookup_signed_typename (language
,"long"));
521 /* For other languages the result type is unchanged from gdb
522 version 6.7 for backward compatibility.
523 If either arg was long long, make sure that value is also long
524 long. Otherwise use long. */
525 if (unsigned_operation
)
527 if (result_len
> gdbarch_long_bit (gdbarch
) / HOST_CHAR_BIT
)
528 promoted_type
= builtin
->builtin_unsigned_long_long
;
530 promoted_type
= builtin
->builtin_unsigned_long
;
534 if (result_len
> gdbarch_long_bit (gdbarch
) / HOST_CHAR_BIT
)
535 promoted_type
= builtin
->builtin_long_long
;
537 promoted_type
= builtin
->builtin_long
;
545 /* Promote both operands to common type. */
546 *arg1
= value_cast (promoted_type
, *arg1
);
547 *arg2
= value_cast (promoted_type
, *arg2
);
552 ptrmath_type_p (const struct language_defn
*lang
, struct type
*type
)
554 type
= check_typedef (type
);
555 if (TYPE_IS_REFERENCE (type
))
556 type
= TYPE_TARGET_TYPE (type
);
558 switch (type
->code ())
564 case TYPE_CODE_ARRAY
:
565 return type
->is_vector () ? 0 : lang
->c_style_arrays_p ();
572 /* Represents a fake method with the given parameter types. This is
573 used by the parser to construct a temporary "expected" type for
574 method overload resolution. FLAGS is used as instance flags of the
575 new type, in order to be able to make the new type represent a
576 const/volatile overload. */
581 fake_method (type_instance_flags flags
,
582 int num_types
, struct type
**param_types
);
585 /* The constructed type. */
586 struct type
*type () { return &m_type
; }
589 struct type m_type
{};
590 main_type m_main_type
{};
593 fake_method::fake_method (type_instance_flags flags
,
594 int num_types
, struct type
**param_types
)
596 struct type
*type
= &m_type
;
598 TYPE_MAIN_TYPE (type
) = &m_main_type
;
599 TYPE_LENGTH (type
) = 1;
600 type
->set_code (TYPE_CODE_METHOD
);
601 TYPE_CHAIN (type
) = type
;
602 type
->set_instance_flags (flags
);
605 if (param_types
[num_types
- 1] == NULL
)
608 type
->set_has_varargs (true);
610 else if (check_typedef (param_types
[num_types
- 1])->code ()
614 /* Caller should have ensured this. */
615 gdb_assert (num_types
== 0);
616 type
->set_is_prototyped (true);
620 /* We don't use TYPE_ZALLOC here to allocate space as TYPE is owned by
621 neither an objfile nor a gdbarch. As a result we must manually
622 allocate memory for auxiliary fields, and free the memory ourselves
623 when we are done with it. */
624 type
->set_num_fields (num_types
);
626 ((struct field
*) xzalloc (sizeof (struct field
) * num_types
));
628 while (num_types
-- > 0)
629 type
->field (num_types
).set_type (param_types
[num_types
]);
632 fake_method::~fake_method ()
634 xfree (m_type
.fields ());
637 /* Helper for evaluating an OP_VAR_VALUE. */
640 evaluate_var_value (enum noside noside
, const block
*blk
, symbol
*var
)
642 /* JYG: We used to just return value_zero of the symbol type if
643 we're asked to avoid side effects. Otherwise we return
644 value_of_variable (...). However I'm not sure if
645 value_of_variable () has any side effect. We need a full value
646 object returned here for whatis_exp () to call evaluate_type ()
647 and then pass the full value to value_rtti_target_type () if we
648 are dealing with a pointer or reference to a base class and print
651 struct value
*ret
= NULL
;
655 ret
= value_of_variable (var
, blk
);
658 catch (const gdb_exception_error
&except
)
660 if (noside
!= EVAL_AVOID_SIDE_EFFECTS
)
663 ret
= value_zero (SYMBOL_TYPE (var
), not_lval
);
669 /* Helper for evaluating an OP_VAR_MSYM_VALUE. */
672 evaluate_var_msym_value (enum noside noside
,
673 struct objfile
*objfile
, minimal_symbol
*msymbol
)
676 type
*the_type
= find_minsym_type_and_address (msymbol
, objfile
, &address
);
678 if (noside
== EVAL_AVOID_SIDE_EFFECTS
&& !the_type
->is_gnu_ifunc ())
679 return value_zero (the_type
, not_lval
);
681 return value_at_lazy (the_type
, address
);
684 /* Helper for returning a value when handling EVAL_SKIP. */
687 eval_skip_value (expression
*exp
)
689 return value_from_longest (builtin_type (exp
->gdbarch
)->builtin_int
, 1);
692 /* See expression.h. */
695 evaluate_subexp_do_call (expression
*exp
, enum noside noside
,
697 gdb::array_view
<value
*> argvec
,
698 const char *function_name
,
699 type
*default_return_type
)
702 error (_("Cannot evaluate function -- may be inlined"));
703 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
705 /* If the return type doesn't look like a function type,
706 call an error. This can happen if somebody tries to turn
707 a variable into a function call. */
709 type
*ftype
= value_type (callee
);
711 if (ftype
->code () == TYPE_CODE_INTERNAL_FUNCTION
)
713 /* We don't know anything about what the internal
714 function might return, but we have to return
716 return value_zero (builtin_type (exp
->gdbarch
)->builtin_int
,
719 else if (ftype
->code () == TYPE_CODE_XMETHOD
)
721 type
*return_type
= result_type_of_xmethod (callee
, argvec
);
723 if (return_type
== NULL
)
724 error (_("Xmethod is missing return type."));
725 return value_zero (return_type
, not_lval
);
727 else if (ftype
->code () == TYPE_CODE_FUNC
728 || ftype
->code () == TYPE_CODE_METHOD
)
730 if (ftype
->is_gnu_ifunc ())
732 CORE_ADDR address
= value_address (callee
);
733 type
*resolved_type
= find_gnu_ifunc_target_type (address
);
735 if (resolved_type
!= NULL
)
736 ftype
= resolved_type
;
739 type
*return_type
= TYPE_TARGET_TYPE (ftype
);
741 if (return_type
== NULL
)
742 return_type
= default_return_type
;
744 if (return_type
== NULL
)
745 error_call_unknown_return_type (function_name
);
747 return allocate_value (return_type
);
750 error (_("Expression of type other than "
751 "\"Function returning ...\" used as function"));
753 switch (value_type (callee
)->code ())
755 case TYPE_CODE_INTERNAL_FUNCTION
:
756 return call_internal_function (exp
->gdbarch
, exp
->language_defn
,
757 callee
, argvec
.size (), argvec
.data ());
758 case TYPE_CODE_XMETHOD
:
759 return call_xmethod (callee
, argvec
);
761 return call_function_by_hand (callee
, default_return_type
, argvec
);
765 /* Helper for evaluating an OP_FUNCALL. */
768 evaluate_funcall (type
*expect_type
, expression
*exp
, int *pos
,
776 symbol
*function
= NULL
;
777 char *function_name
= NULL
;
778 const char *var_func_name
= NULL
;
783 exp_opcode op
= exp
->elts
[*pos
].opcode
;
784 int nargs
= longest_to_int (exp
->elts
[pc
].longconst
);
785 /* Allocate arg vector, including space for the function to be
786 called in argvec[0], a potential `this', and a terminating
788 value
**argvec
= (value
**) alloca (sizeof (value
*) * (nargs
+ 3));
789 if (op
== STRUCTOP_MEMBER
|| op
== STRUCTOP_MPTR
)
791 /* First, evaluate the structure into arg2. */
794 if (op
== STRUCTOP_MEMBER
)
796 arg2
= evaluate_subexp_for_address (exp
, pos
, noside
);
800 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
803 /* If the function is a virtual function, then the aggregate
804 value (providing the structure) plays its part by providing
805 the vtable. Otherwise, it is just along for the ride: call
806 the function directly. */
808 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
810 type
*a1_type
= check_typedef (value_type (arg1
));
811 if (noside
== EVAL_SKIP
)
812 tem
= 1; /* Set it to the right arg index so that all
813 arguments can also be skipped. */
814 else if (a1_type
->code () == TYPE_CODE_METHODPTR
)
816 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
817 arg1
= value_zero (TYPE_TARGET_TYPE (a1_type
), not_lval
);
819 arg1
= cplus_method_ptr_to_value (&arg2
, arg1
);
821 /* Now, say which argument to start evaluating from. */
826 else if (a1_type
->code () == TYPE_CODE_MEMBERPTR
)
828 struct type
*type_ptr
829 = lookup_pointer_type (TYPE_SELF_TYPE (a1_type
));
830 struct type
*target_type_ptr
831 = lookup_pointer_type (TYPE_TARGET_TYPE (a1_type
));
833 /* Now, convert these values to an address. */
834 arg2
= value_cast (type_ptr
, arg2
);
836 long mem_offset
= value_as_long (arg1
);
838 arg1
= value_from_pointer (target_type_ptr
,
839 value_as_long (arg2
) + mem_offset
);
840 arg1
= value_ind (arg1
);
844 error (_("Non-pointer-to-member value used in pointer-to-member "
847 else if (op
== STRUCTOP_STRUCT
|| op
== STRUCTOP_PTR
)
849 /* Hair for method invocations. */
853 /* First, evaluate the structure into arg2. */
855 tem2
= longest_to_int (exp
->elts
[pc2
+ 1].longconst
);
856 *pos
+= 3 + BYTES_TO_EXP_ELEM (tem2
+ 1);
858 if (op
== STRUCTOP_STRUCT
)
860 /* If v is a variable in a register, and the user types
861 v.method (), this will produce an error, because v has no
864 A possible way around this would be to allocate a copy of
865 the variable on the stack, copy in the contents, call the
866 function, and copy out the contents. I.e. convert this
867 from call by reference to call by copy-return (or
868 whatever it's called). However, this does not work
869 because it is not the same: the method being called could
870 stash a copy of the address, and then future uses through
871 that address (after the method returns) would be expected
872 to use the variable itself, not some copy of it. */
873 arg2
= evaluate_subexp_for_address (exp
, pos
, noside
);
877 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
879 /* Check to see if the operator '->' has been overloaded.
880 If the operator has been overloaded replace arg2 with the
881 value returned by the custom operator and continue
883 while (unop_user_defined_p (op
, arg2
))
885 struct value
*value
= NULL
;
888 value
= value_x_unop (arg2
, op
, noside
);
891 catch (const gdb_exception_error
&except
)
893 if (except
.error
== NOT_FOUND_ERROR
)
902 /* Now, say which argument to start evaluating from. */
905 else if (op
== OP_SCOPE
906 && overload_resolution
907 && (exp
->language_defn
->la_language
== language_cplus
))
909 /* Unpack it locally so we can properly handle overload
915 local_tem
= longest_to_int (exp
->elts
[pc2
+ 2].longconst
);
916 (*pos
) += 4 + BYTES_TO_EXP_ELEM (local_tem
+ 1);
917 struct type
*type
= exp
->elts
[pc2
+ 1].type
;
918 name
= &exp
->elts
[pc2
+ 3].string
;
921 function_name
= NULL
;
922 if (type
->code () == TYPE_CODE_NAMESPACE
)
924 function
= cp_lookup_symbol_namespace (type
->name (),
926 get_selected_block (0),
928 if (function
== NULL
)
929 error (_("No symbol \"%s\" in namespace \"%s\"."),
930 name
, type
->name ());
933 /* arg2 is left as NULL on purpose. */
937 gdb_assert (type
->code () == TYPE_CODE_STRUCT
938 || type
->code () == TYPE_CODE_UNION
);
939 function_name
= name
;
941 /* We need a properly typed value for method lookup. For
942 static methods arg2 is otherwise unused. */
943 arg2
= value_zero (type
, lval_memory
);
948 else if (op
== OP_ADL_FUNC
)
950 /* Save the function position and move pos so that the arguments
957 func_name_len
= longest_to_int (exp
->elts
[save_pos1
+ 3].longconst
);
958 (*pos
) += 6 + BYTES_TO_EXP_ELEM (func_name_len
+ 1);
962 /* Non-method function call. */
966 /* If this is a C++ function wait until overload resolution. */
967 if (op
== OP_VAR_VALUE
968 && overload_resolution
969 && (exp
->language_defn
->la_language
== language_cplus
))
971 (*pos
) += 4; /* Skip the evaluation of the symbol. */
976 if (op
== OP_VAR_MSYM_VALUE
)
978 minimal_symbol
*msym
= exp
->elts
[*pos
+ 2].msymbol
;
979 var_func_name
= msym
->print_name ();
981 else if (op
== OP_VAR_VALUE
)
983 symbol
*sym
= exp
->elts
[*pos
+ 2].symbol
;
984 var_func_name
= sym
->print_name ();
987 argvec
[0] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
988 type
*type
= value_type (argvec
[0]);
989 if (type
&& type
->code () == TYPE_CODE_PTR
)
990 type
= TYPE_TARGET_TYPE (type
);
991 if (type
&& type
->code () == TYPE_CODE_FUNC
)
993 for (; tem
<= nargs
&& tem
<= type
->num_fields (); tem
++)
995 argvec
[tem
] = evaluate_subexp (type
->field (tem
- 1).type (),
1002 /* Evaluate arguments (if not already done, e.g., namespace::func()
1003 and overload-resolution is off). */
1004 for (; tem
<= nargs
; tem
++)
1006 /* Ensure that array expressions are coerced into pointer
1008 argvec
[tem
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
1011 /* Signal end of arglist. */
1014 if (noside
== EVAL_SKIP
)
1015 return eval_skip_value (exp
);
1017 if (op
== OP_ADL_FUNC
)
1019 struct symbol
*symp
;
1022 int string_pc
= save_pos1
+ 3;
1024 /* Extract the function name. */
1025 name_len
= longest_to_int (exp
->elts
[string_pc
].longconst
);
1026 func_name
= (char *) alloca (name_len
+ 1);
1027 strcpy (func_name
, &exp
->elts
[string_pc
+ 1].string
);
1029 find_overload_match (gdb::make_array_view (&argvec
[1], nargs
),
1031 NON_METHOD
, /* not method */
1032 NULL
, NULL
, /* pass NULL symbol since
1033 symbol is unknown */
1034 NULL
, &symp
, NULL
, 0, noside
);
1036 /* Now fix the expression being evaluated. */
1037 exp
->elts
[save_pos1
+ 2].symbol
= symp
;
1038 argvec
[0] = evaluate_subexp_with_coercion (exp
, &save_pos1
, noside
);
1041 if (op
== STRUCTOP_STRUCT
|| op
== STRUCTOP_PTR
1042 || (op
== OP_SCOPE
&& function_name
!= NULL
))
1044 int static_memfuncp
;
1047 /* Method invocation: stuff "this" as first parameter. If the
1048 method turns out to be static we undo this below. */
1053 /* Name of method from expression. */
1054 tstr
= &exp
->elts
[pc2
+ 2].string
;
1057 tstr
= function_name
;
1059 if (overload_resolution
&& (exp
->language_defn
->la_language
1062 /* Language is C++, do some overload resolution before
1064 struct value
*valp
= NULL
;
1066 (void) find_overload_match (gdb::make_array_view (&argvec
[1], nargs
),
1068 METHOD
, /* method */
1069 &arg2
, /* the object */
1071 &static_memfuncp
, 0, noside
);
1073 if (op
== OP_SCOPE
&& !static_memfuncp
)
1075 /* For the time being, we don't handle this. */
1076 error (_("Call to overloaded function %s requires "
1080 argvec
[1] = arg2
; /* the ``this'' pointer */
1081 argvec
[0] = valp
; /* Use the method found after overload
1085 /* Non-C++ case -- or no overload resolution. */
1087 struct value
*temp
= arg2
;
1089 argvec
[0] = value_struct_elt (&temp
, argvec
+ 1, tstr
,
1091 op
== STRUCTOP_STRUCT
1092 ? "structure" : "structure pointer");
1093 /* value_struct_elt updates temp with the correct value of
1094 the ``this'' pointer if necessary, so modify argvec[1] to
1095 reflect any ``this'' changes. */
1097 = value_from_longest (lookup_pointer_type(value_type (temp
)),
1098 value_address (temp
)
1099 + value_embedded_offset (temp
));
1100 argvec
[1] = arg2
; /* the ``this'' pointer */
1103 /* Take out `this' if needed. */
1104 if (static_memfuncp
)
1106 argvec
[1] = argvec
[0];
1111 else if (op
== STRUCTOP_MEMBER
|| op
== STRUCTOP_MPTR
)
1113 /* Pointer to member. argvec[1] is already set up. */
1116 else if (op
== OP_VAR_VALUE
|| (op
== OP_SCOPE
&& function
!= NULL
))
1118 /* Non-member function being called. */
1119 /* fn: This can only be done for C++ functions. A C-style
1120 function in a C++ program, for instance, does not have the
1121 fields that are expected here. */
1123 if (overload_resolution
&& (exp
->language_defn
->la_language
1126 /* Language is C++, do some overload resolution before
1128 struct symbol
*symp
;
1131 /* If a scope has been specified disable ADL. */
1135 if (op
== OP_VAR_VALUE
)
1136 function
= exp
->elts
[save_pos1
+2].symbol
;
1138 (void) find_overload_match (gdb::make_array_view (&argvec
[1], nargs
),
1139 NULL
, /* no need for name */
1140 NON_METHOD
, /* not method */
1141 NULL
, function
, /* the function */
1142 NULL
, &symp
, NULL
, no_adl
, noside
);
1144 if (op
== OP_VAR_VALUE
)
1146 /* Now fix the expression being evaluated. */
1147 exp
->elts
[save_pos1
+2].symbol
= symp
;
1148 argvec
[0] = evaluate_subexp_with_coercion (exp
, &save_pos1
,
1152 argvec
[0] = value_of_variable (symp
, get_selected_block (0));
1156 /* Not C++, or no overload resolution allowed. */
1157 /* Nothing to be done; argvec already correctly set up. */
1162 /* It is probably a C-style function. */
1163 /* Nothing to be done; argvec already correctly set up. */
1166 return evaluate_subexp_do_call (exp
, noside
, argvec
[0],
1167 gdb::make_array_view (argvec
+ 1, nargs
),
1168 var_func_name
, expect_type
);
1171 /* Return true if type is integral or reference to integral */
1174 is_integral_or_integral_reference (struct type
*type
)
1176 if (is_integral_type (type
))
1179 type
= check_typedef (type
);
1180 return (type
!= nullptr
1181 && TYPE_IS_REFERENCE (type
)
1182 && is_integral_type (TYPE_TARGET_TYPE (type
)));
1185 /* Helper function that implements the body of OP_SCOPE. */
1187 static struct value
*
1188 eval_op_scope (struct type
*expect_type
, struct expression
*exp
,
1190 struct type
*type
, const char *string
)
1192 if (noside
== EVAL_SKIP
)
1193 return eval_skip_value (exp
);
1194 struct value
*arg1
= value_aggregate_elt (type
, string
, expect_type
,
1197 error (_("There is no field named %s"), string
);
1201 /* Helper function that implements the body of OP_VAR_ENTRY_VALUE. */
1203 static struct value
*
1204 eval_op_var_entry_value (struct type
*expect_type
, struct expression
*exp
,
1205 enum noside noside
, symbol
*sym
)
1207 if (noside
== EVAL_SKIP
)
1208 return eval_skip_value (exp
);
1209 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1210 return value_zero (SYMBOL_TYPE (sym
), not_lval
);
1212 if (SYMBOL_COMPUTED_OPS (sym
) == NULL
1213 || SYMBOL_COMPUTED_OPS (sym
)->read_variable_at_entry
== NULL
)
1214 error (_("Symbol \"%s\" does not have any specific entry value"),
1215 sym
->print_name ());
1217 struct frame_info
*frame
= get_selected_frame (NULL
);
1218 return SYMBOL_COMPUTED_OPS (sym
)->read_variable_at_entry (sym
, frame
);
1221 /* Helper function that implements the body of OP_VAR_MSYM_VALUE. */
1223 static struct value
*
1224 eval_op_var_msym_value (struct type
*expect_type
, struct expression
*exp
,
1225 enum noside noside
, bool outermost_p
,
1226 minimal_symbol
*msymbol
, struct objfile
*objfile
)
1228 value
*val
= evaluate_var_msym_value (noside
, objfile
, msymbol
);
1230 struct type
*type
= value_type (val
);
1231 if (type
->code () == TYPE_CODE_ERROR
1232 && (noside
!= EVAL_AVOID_SIDE_EFFECTS
|| !outermost_p
))
1233 error_unknown_type (msymbol
->print_name ());
1237 /* Helper function that implements the body of OP_FUNC_STATIC_VAR. */
1239 static struct value
*
1240 eval_op_func_static_var (struct type
*expect_type
, struct expression
*exp
,
1242 value
*func
, const char *var
)
1244 if (noside
== EVAL_SKIP
)
1245 return eval_skip_value (exp
);
1246 CORE_ADDR addr
= value_address (func
);
1247 const block
*blk
= block_for_pc (addr
);
1248 struct block_symbol sym
= lookup_symbol (var
, blk
, VAR_DOMAIN
, NULL
);
1249 if (sym
.symbol
== NULL
)
1250 error (_("No symbol \"%s\" in specified context."), var
);
1251 return evaluate_var_value (noside
, sym
.block
, sym
.symbol
);
1254 /* Helper function that implements the body of OP_REGISTER. */
1256 static struct value
*
1257 eval_op_register (struct type
*expect_type
, struct expression
*exp
,
1258 enum noside noside
, const char *name
)
1263 regno
= user_reg_map_name_to_regnum (exp
->gdbarch
,
1264 name
, strlen (name
));
1266 error (_("Register $%s not available."), name
);
1268 /* In EVAL_AVOID_SIDE_EFFECTS mode, we only need to return
1269 a value with the appropriate register type. Unfortunately,
1270 we don't have easy access to the type of user registers.
1271 So for these registers, we fetch the register value regardless
1272 of the evaluation mode. */
1273 if (noside
== EVAL_AVOID_SIDE_EFFECTS
1274 && regno
< gdbarch_num_cooked_regs (exp
->gdbarch
))
1275 val
= value_zero (register_type (exp
->gdbarch
, regno
), not_lval
);
1277 val
= value_of_register (regno
, get_selected_frame (NULL
));
1279 error (_("Value of register %s not available."), name
);
1284 /* Helper function that implements the body of OP_STRING. */
1286 static struct value
*
1287 eval_op_string (struct type
*expect_type
, struct expression
*exp
,
1288 enum noside noside
, int len
, const char *string
)
1290 if (noside
== EVAL_SKIP
)
1291 return eval_skip_value (exp
);
1292 struct type
*type
= language_string_char_type (exp
->language_defn
,
1294 return value_string (string
, len
, type
);
1297 /* Helper function that implements the body of OP_OBJC_SELECTOR. */
1299 static struct value
*
1300 eval_op_objc_selector (struct type
*expect_type
, struct expression
*exp
,
1304 if (noside
== EVAL_SKIP
)
1305 return eval_skip_value (exp
);
1307 struct type
*selector_type
= builtin_type (exp
->gdbarch
)->builtin_data_ptr
;
1308 return value_from_longest (selector_type
,
1309 lookup_child_selector (exp
->gdbarch
, sel
));
1312 /* Helper function that implements the body of BINOP_CONCAT. */
1314 static struct value
*
1315 eval_op_concat (struct type
*expect_type
, struct expression
*exp
,
1317 enum exp_opcode op
, struct value
*arg1
, struct value
*arg2
)
1319 if (noside
== EVAL_SKIP
)
1320 return eval_skip_value (exp
);
1321 if (binop_user_defined_p (op
, arg1
, arg2
))
1322 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1324 return value_concat (arg1
, arg2
);
1327 /* A helper function for TERNOP_SLICE. */
1329 static struct value
*
1330 eval_op_ternop (struct type
*expect_type
, struct expression
*exp
,
1332 struct value
*array
, struct value
*low
, struct value
*upper
)
1334 if (noside
== EVAL_SKIP
)
1335 return eval_skip_value (exp
);
1336 int lowbound
= value_as_long (low
);
1337 int upperbound
= value_as_long (upper
);
1338 return value_slice (array
, lowbound
, upperbound
- lowbound
+ 1);
1341 /* A helper function for STRUCTOP_STRUCT. */
1343 static struct value
*
1344 eval_op_structop_struct (struct type
*expect_type
, struct expression
*exp
,
1346 struct value
*arg1
, const char *string
)
1348 if (noside
== EVAL_SKIP
)
1349 return eval_skip_value (exp
);
1350 struct value
*arg3
= value_struct_elt (&arg1
, NULL
, string
,
1352 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1353 arg3
= value_zero (value_type (arg3
), VALUE_LVAL (arg3
));
1357 /* A helper function for STRUCTOP_PTR. */
1359 static struct value
*
1360 eval_op_structop_ptr (struct type
*expect_type
, struct expression
*exp
,
1361 enum noside noside
, enum exp_opcode op
,
1362 struct value
*arg1
, const char *string
)
1364 if (noside
== EVAL_SKIP
)
1365 return eval_skip_value (exp
);
1367 /* Check to see if operator '->' has been overloaded. If so replace
1368 arg1 with the value returned by evaluating operator->(). */
1369 while (unop_user_defined_p (op
, arg1
))
1371 struct value
*value
= NULL
;
1374 value
= value_x_unop (arg1
, op
, noside
);
1377 catch (const gdb_exception_error
&except
)
1379 if (except
.error
== NOT_FOUND_ERROR
)
1388 /* JYG: if print object is on we need to replace the base type
1389 with rtti type in order to continue on with successful
1390 lookup of member / method only available in the rtti type. */
1392 struct type
*arg_type
= value_type (arg1
);
1393 struct type
*real_type
;
1394 int full
, using_enc
;
1396 struct value_print_options opts
;
1398 get_user_print_options (&opts
);
1399 if (opts
.objectprint
&& TYPE_TARGET_TYPE (arg_type
)
1400 && (TYPE_TARGET_TYPE (arg_type
)->code () == TYPE_CODE_STRUCT
))
1402 real_type
= value_rtti_indirect_type (arg1
, &full
, &top
,
1405 arg1
= value_cast (real_type
, arg1
);
1409 struct value
*arg3
= value_struct_elt (&arg1
, NULL
, string
,
1410 NULL
, "structure pointer");
1411 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1412 arg3
= value_zero (value_type (arg3
), VALUE_LVAL (arg3
));
1416 /* A helper function for STRUCTOP_MEMBER. */
1418 static struct value
*
1419 eval_op_member (struct type
*expect_type
, struct expression
*exp
,
1421 struct value
*arg1
, struct value
*arg2
)
1425 if (noside
== EVAL_SKIP
)
1426 return eval_skip_value (exp
);
1429 struct type
*type
= check_typedef (value_type (arg2
));
1430 switch (type
->code ())
1432 case TYPE_CODE_METHODPTR
:
1433 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1434 return value_zero (TYPE_TARGET_TYPE (type
), not_lval
);
1437 arg2
= cplus_method_ptr_to_value (&arg1
, arg2
);
1438 gdb_assert (value_type (arg2
)->code () == TYPE_CODE_PTR
);
1439 return value_ind (arg2
);
1442 case TYPE_CODE_MEMBERPTR
:
1443 /* Now, convert these values to an address. */
1444 arg1
= value_cast_pointers (lookup_pointer_type (TYPE_SELF_TYPE (type
)),
1447 mem_offset
= value_as_long (arg2
);
1449 arg3
= value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
1450 value_as_long (arg1
) + mem_offset
);
1451 return value_ind (arg3
);
1454 error (_("non-pointer-to-member value used "
1455 "in pointer-to-member construct"));
1459 /* A helper function for BINOP_ADD. */
1461 static struct value
*
1462 eval_op_add (struct type
*expect_type
, struct expression
*exp
,
1463 enum noside noside
, enum exp_opcode op
,
1464 struct value
*arg1
, struct value
*arg2
)
1466 if (noside
== EVAL_SKIP
)
1467 return eval_skip_value (exp
);
1468 if (binop_user_defined_p (op
, arg1
, arg2
))
1469 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1470 else if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
))
1471 && is_integral_or_integral_reference (value_type (arg2
)))
1472 return value_ptradd (arg1
, value_as_long (arg2
));
1473 else if (ptrmath_type_p (exp
->language_defn
, value_type (arg2
))
1474 && is_integral_or_integral_reference (value_type (arg1
)))
1475 return value_ptradd (arg2
, value_as_long (arg1
));
1478 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1479 return value_binop (arg1
, arg2
, BINOP_ADD
);
1483 /* A helper function for BINOP_SUB. */
1485 static struct value
*
1486 eval_op_sub (struct type
*expect_type
, struct expression
*exp
,
1487 enum noside noside
, enum exp_opcode op
,
1488 struct value
*arg1
, struct value
*arg2
)
1490 if (noside
== EVAL_SKIP
)
1491 return eval_skip_value (exp
);
1492 if (binop_user_defined_p (op
, arg1
, arg2
))
1493 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1494 else if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
))
1495 && ptrmath_type_p (exp
->language_defn
, value_type (arg2
)))
1497 /* FIXME -- should be ptrdiff_t */
1498 struct type
*type
= builtin_type (exp
->gdbarch
)->builtin_long
;
1499 return value_from_longest (type
, value_ptrdiff (arg1
, arg2
));
1501 else if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
))
1502 && is_integral_or_integral_reference (value_type (arg2
)))
1503 return value_ptradd (arg1
, - value_as_long (arg2
));
1506 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1507 return value_binop (arg1
, arg2
, BINOP_SUB
);
1511 /* Helper function for several different binary operations. */
1513 static struct value
*
1514 eval_op_binary (struct type
*expect_type
, struct expression
*exp
,
1515 enum noside noside
, enum exp_opcode op
,
1516 struct value
*arg1
, struct value
*arg2
)
1518 if (noside
== EVAL_SKIP
)
1519 return eval_skip_value (exp
);
1520 if (binop_user_defined_p (op
, arg1
, arg2
))
1521 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1524 /* If EVAL_AVOID_SIDE_EFFECTS and we're dividing by zero,
1525 fudge arg2 to avoid division-by-zero, the caller is
1526 (theoretically) only looking for the type of the result. */
1527 if (noside
== EVAL_AVOID_SIDE_EFFECTS
1528 /* ??? Do we really want to test for BINOP_MOD here?
1529 The implementation of value_binop gives it a well-defined
1532 || op
== BINOP_INTDIV
1535 && value_logical_not (arg2
))
1537 struct value
*v_one
;
1539 v_one
= value_one (value_type (arg2
));
1540 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &v_one
);
1541 return value_binop (arg1
, v_one
, op
);
1545 /* For shift and integer exponentiation operations,
1546 only promote the first argument. */
1547 if ((op
== BINOP_LSH
|| op
== BINOP_RSH
|| op
== BINOP_EXP
)
1548 && is_integral_type (value_type (arg2
)))
1549 unop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
);
1551 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1553 return value_binop (arg1
, arg2
, op
);
1558 /* A helper function for BINOP_SUBSCRIPT. */
1560 static struct value
*
1561 eval_op_subscript (struct type
*expect_type
, struct expression
*exp
,
1562 enum noside noside
, enum exp_opcode op
,
1563 struct value
*arg1
, struct value
*arg2
)
1565 if (noside
== EVAL_SKIP
)
1566 return eval_skip_value (exp
);
1567 if (binop_user_defined_p (op
, arg1
, arg2
))
1568 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1571 /* If the user attempts to subscript something that is not an
1572 array or pointer type (like a plain int variable for example),
1573 then report this as an error. */
1575 arg1
= coerce_ref (arg1
);
1576 struct type
*type
= check_typedef (value_type (arg1
));
1577 if (type
->code () != TYPE_CODE_ARRAY
1578 && type
->code () != TYPE_CODE_PTR
)
1581 error (_("cannot subscript something of type `%s'"),
1584 error (_("cannot subscript requested type"));
1587 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1588 return value_zero (TYPE_TARGET_TYPE (type
), VALUE_LVAL (arg1
));
1590 return value_subscript (arg1
, value_as_long (arg2
));
1594 /* A helper function for BINOP_EQUAL. */
1596 static struct value
*
1597 eval_op_equal (struct type
*expect_type
, struct expression
*exp
,
1598 enum noside noside
, enum exp_opcode op
,
1599 struct value
*arg1
, struct value
*arg2
)
1601 if (noside
== EVAL_SKIP
)
1602 return eval_skip_value (exp
);
1603 if (binop_user_defined_p (op
, arg1
, arg2
))
1605 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1609 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1610 int tem
= value_equal (arg1
, arg2
);
1611 struct type
*type
= language_bool_type (exp
->language_defn
,
1613 return value_from_longest (type
, (LONGEST
) tem
);
1617 /* A helper function for BINOP_NOTEQUAL. */
1619 static struct value
*
1620 eval_op_notequal (struct type
*expect_type
, struct expression
*exp
,
1621 enum noside noside
, enum exp_opcode op
,
1622 struct value
*arg1
, struct value
*arg2
)
1624 if (noside
== EVAL_SKIP
)
1625 return eval_skip_value (exp
);
1626 if (binop_user_defined_p (op
, arg1
, arg2
))
1628 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1632 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1633 int tem
= value_equal (arg1
, arg2
);
1634 struct type
*type
= language_bool_type (exp
->language_defn
,
1636 return value_from_longest (type
, (LONGEST
) ! tem
);
1640 /* A helper function for BINOP_LESS. */
1642 static struct value
*
1643 eval_op_less (struct type
*expect_type
, struct expression
*exp
,
1644 enum noside noside
, enum exp_opcode op
,
1645 struct value
*arg1
, struct value
*arg2
)
1647 if (noside
== EVAL_SKIP
)
1648 return eval_skip_value (exp
);
1649 if (binop_user_defined_p (op
, arg1
, arg2
))
1651 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1655 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1656 int tem
= value_less (arg1
, arg2
);
1657 struct type
*type
= language_bool_type (exp
->language_defn
,
1659 return value_from_longest (type
, (LONGEST
) tem
);
1663 /* A helper function for BINOP_GTR. */
1665 static struct value
*
1666 eval_op_gtr (struct type
*expect_type
, struct expression
*exp
,
1667 enum noside noside
, enum exp_opcode op
,
1668 struct value
*arg1
, struct value
*arg2
)
1670 if (noside
== EVAL_SKIP
)
1671 return eval_skip_value (exp
);
1672 if (binop_user_defined_p (op
, arg1
, arg2
))
1674 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1678 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1679 int tem
= value_less (arg2
, arg1
);
1680 struct type
*type
= language_bool_type (exp
->language_defn
,
1682 return value_from_longest (type
, (LONGEST
) tem
);
1686 /* A helper function for BINOP_GEQ. */
1688 static struct value
*
1689 eval_op_geq (struct type
*expect_type
, struct expression
*exp
,
1690 enum noside noside
, enum exp_opcode op
,
1691 struct value
*arg1
, struct value
*arg2
)
1693 if (noside
== EVAL_SKIP
)
1694 return eval_skip_value (exp
);
1695 if (binop_user_defined_p (op
, arg1
, arg2
))
1697 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1701 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1702 int tem
= value_less (arg2
, arg1
) || value_equal (arg1
, arg2
);
1703 struct type
*type
= language_bool_type (exp
->language_defn
,
1705 return value_from_longest (type
, (LONGEST
) tem
);
1709 /* A helper function for BINOP_LEQ. */
1711 static struct value
*
1712 eval_op_leq (struct type
*expect_type
, struct expression
*exp
,
1713 enum noside noside
, enum exp_opcode op
,
1714 struct value
*arg1
, struct value
*arg2
)
1716 if (noside
== EVAL_SKIP
)
1717 return eval_skip_value (exp
);
1718 if (binop_user_defined_p (op
, arg1
, arg2
))
1720 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
1724 binop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
, &arg2
);
1725 int tem
= value_less (arg1
, arg2
) || value_equal (arg1
, arg2
);
1726 struct type
*type
= language_bool_type (exp
->language_defn
,
1728 return value_from_longest (type
, (LONGEST
) tem
);
1732 /* A helper function for BINOP_REPEAT. */
1734 static struct value
*
1735 eval_op_repeat (struct type
*expect_type
, struct expression
*exp
,
1737 struct value
*arg1
, struct value
*arg2
)
1739 if (noside
== EVAL_SKIP
)
1740 return eval_skip_value (exp
);
1741 struct type
*type
= check_typedef (value_type (arg2
));
1742 if (type
->code () != TYPE_CODE_INT
1743 && type
->code () != TYPE_CODE_ENUM
)
1744 error (_("Non-integral right operand for \"@\" operator."));
1745 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
1747 return allocate_repeat_value (value_type (arg1
),
1748 longest_to_int (value_as_long (arg2
)));
1751 return value_repeat (arg1
, longest_to_int (value_as_long (arg2
)));
1754 /* A helper function for UNOP_PLUS. */
1756 static struct value
*
1757 eval_op_plus (struct type
*expect_type
, struct expression
*exp
,
1758 enum noside noside
, enum exp_opcode op
,
1761 if (noside
== EVAL_SKIP
)
1762 return eval_skip_value (exp
);
1763 if (unop_user_defined_p (op
, arg1
))
1764 return value_x_unop (arg1
, op
, noside
);
1767 unop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
);
1768 return value_pos (arg1
);
1772 /* A helper function for UNOP_NEG. */
1774 static struct value
*
1775 eval_op_neg (struct type
*expect_type
, struct expression
*exp
,
1776 enum noside noside
, enum exp_opcode op
,
1779 if (noside
== EVAL_SKIP
)
1780 return eval_skip_value (exp
);
1781 if (unop_user_defined_p (op
, arg1
))
1782 return value_x_unop (arg1
, op
, noside
);
1785 unop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
);
1786 return value_neg (arg1
);
1790 /* A helper function for UNOP_COMPLEMENT. */
1792 static struct value
*
1793 eval_op_complement (struct type
*expect_type
, struct expression
*exp
,
1794 enum noside noside
, enum exp_opcode op
,
1797 if (noside
== EVAL_SKIP
)
1798 return eval_skip_value (exp
);
1799 if (unop_user_defined_p (UNOP_COMPLEMENT
, arg1
))
1800 return value_x_unop (arg1
, UNOP_COMPLEMENT
, noside
);
1803 unop_promote (exp
->language_defn
, exp
->gdbarch
, &arg1
);
1804 return value_complement (arg1
);
1809 evaluate_subexp_standard (struct type
*expect_type
,
1810 struct expression
*exp
, int *pos
,
1814 int tem
, tem2
, tem3
;
1816 struct value
*arg1
= NULL
;
1817 struct value
*arg2
= NULL
;
1821 struct value
**argvec
;
1823 struct type
**arg_types
;
1826 op
= exp
->elts
[pc
].opcode
;
1831 tem
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
1832 (*pos
) += 4 + BYTES_TO_EXP_ELEM (tem
+ 1);
1833 return eval_op_scope (expect_type
, exp
, noside
,
1834 exp
->elts
[pc
+ 1].type
,
1835 &exp
->elts
[pc
+ 3].string
);
1839 return value_from_longest (exp
->elts
[pc
+ 1].type
,
1840 exp
->elts
[pc
+ 2].longconst
);
1844 return value_from_contents (exp
->elts
[pc
+ 1].type
,
1845 exp
->elts
[pc
+ 2].floatconst
);
1851 symbol
*var
= exp
->elts
[pc
+ 2].symbol
;
1852 if (SYMBOL_TYPE (var
)->code () == TYPE_CODE_ERROR
)
1853 error_unknown_type (var
->print_name ());
1854 if (noside
!= EVAL_SKIP
)
1855 return evaluate_var_value (noside
, exp
->elts
[pc
+ 1].block
, var
);
1858 /* Return a dummy value of the correct type when skipping, so
1859 that parent functions know what is to be skipped. */
1860 return allocate_value (SYMBOL_TYPE (var
));
1864 case OP_VAR_MSYM_VALUE
:
1868 minimal_symbol
*msymbol
= exp
->elts
[pc
+ 2].msymbol
;
1869 return eval_op_var_msym_value (expect_type
, exp
, noside
,
1871 exp
->elts
[pc
+ 1].objfile
);
1874 case OP_VAR_ENTRY_VALUE
:
1878 struct symbol
*sym
= exp
->elts
[pc
+ 1].symbol
;
1880 return eval_op_var_entry_value (expect_type
, exp
, noside
, sym
);
1883 case OP_FUNC_STATIC_VAR
:
1884 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1885 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1886 if (noside
== EVAL_SKIP
)
1887 return eval_skip_value (exp
);
1890 value
*func
= evaluate_subexp_standard (NULL
, exp
, pos
, noside
);
1892 return eval_op_func_static_var (expect_type
, exp
, noside
, func
,
1893 &exp
->elts
[pc
+ 2].string
);
1899 access_value_history (longest_to_int (exp
->elts
[pc
+ 1].longconst
));
1903 const char *name
= &exp
->elts
[pc
+ 2].string
;
1905 (*pos
) += 3 + BYTES_TO_EXP_ELEM (exp
->elts
[pc
+ 1].longconst
+ 1);
1906 return eval_op_register (expect_type
, exp
, noside
, name
);
1910 type
= language_bool_type (exp
->language_defn
, exp
->gdbarch
);
1911 return value_from_longest (type
, exp
->elts
[pc
+ 1].longconst
);
1913 case OP_INTERNALVAR
:
1915 return value_of_internalvar (exp
->gdbarch
,
1916 exp
->elts
[pc
+ 1].internalvar
);
1919 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1920 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1921 return eval_op_string (expect_type
, exp
, noside
, tem
,
1922 &exp
->elts
[pc
+ 2].string
);
1924 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class
1925 NSString constant. */
1926 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1927 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1928 if (noside
== EVAL_SKIP
)
1929 return eval_skip_value (exp
);
1930 return value_nsstring (exp
->gdbarch
, &exp
->elts
[pc
+ 2].string
, tem
+ 1);
1934 tem2
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1935 tem3
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
1936 nargs
= tem3
- tem2
+ 1;
1937 type
= expect_type
? check_typedef (expect_type
) : nullptr;
1939 if (expect_type
!= nullptr && noside
!= EVAL_SKIP
1940 && type
->code () == TYPE_CODE_STRUCT
)
1942 struct value
*rec
= allocate_value (expect_type
);
1944 memset (value_contents_raw (rec
), '\0', TYPE_LENGTH (type
));
1945 return evaluate_struct_tuple (rec
, exp
, pos
, noside
, nargs
);
1948 if (expect_type
!= nullptr && noside
!= EVAL_SKIP
1949 && type
->code () == TYPE_CODE_ARRAY
)
1951 struct type
*range_type
= type
->index_type ();
1952 struct type
*element_type
= TYPE_TARGET_TYPE (type
);
1953 struct value
*array
= allocate_value (expect_type
);
1954 int element_size
= TYPE_LENGTH (check_typedef (element_type
));
1955 LONGEST low_bound
, high_bound
, index
;
1957 if (!get_discrete_bounds (range_type
, &low_bound
, &high_bound
))
1960 high_bound
= (TYPE_LENGTH (type
) / element_size
) - 1;
1963 memset (value_contents_raw (array
), 0, TYPE_LENGTH (expect_type
));
1964 for (tem
= nargs
; --nargs
>= 0;)
1966 struct value
*element
;
1968 element
= evaluate_subexp (element_type
, exp
, pos
, noside
);
1969 if (value_type (element
) != element_type
)
1970 element
= value_cast (element_type
, element
);
1971 if (index
> high_bound
)
1972 /* To avoid memory corruption. */
1973 error (_("Too many array elements"));
1974 memcpy (value_contents_raw (array
)
1975 + (index
- low_bound
) * element_size
,
1976 value_contents (element
),
1983 if (expect_type
!= nullptr && noside
!= EVAL_SKIP
1984 && type
->code () == TYPE_CODE_SET
)
1986 struct value
*set
= allocate_value (expect_type
);
1987 gdb_byte
*valaddr
= value_contents_raw (set
);
1988 struct type
*element_type
= type
->index_type ();
1989 struct type
*check_type
= element_type
;
1990 LONGEST low_bound
, high_bound
;
1992 /* Get targettype of elementtype. */
1993 while (check_type
->code () == TYPE_CODE_RANGE
1994 || check_type
->code () == TYPE_CODE_TYPEDEF
)
1995 check_type
= TYPE_TARGET_TYPE (check_type
);
1997 if (!get_discrete_bounds (element_type
, &low_bound
, &high_bound
))
1998 error (_("(power)set type with unknown size"));
1999 memset (valaddr
, '\0', TYPE_LENGTH (type
));
2000 for (tem
= 0; tem
< nargs
; tem
++)
2002 LONGEST range_low
, range_high
;
2003 struct type
*range_low_type
, *range_high_type
;
2004 struct value
*elem_val
;
2006 elem_val
= evaluate_subexp (element_type
, exp
, pos
, noside
);
2007 range_low_type
= range_high_type
= value_type (elem_val
);
2008 range_low
= range_high
= value_as_long (elem_val
);
2010 /* Check types of elements to avoid mixture of elements from
2011 different types. Also check if type of element is "compatible"
2012 with element type of powerset. */
2013 if (range_low_type
->code () == TYPE_CODE_RANGE
)
2014 range_low_type
= TYPE_TARGET_TYPE (range_low_type
);
2015 if (range_high_type
->code () == TYPE_CODE_RANGE
)
2016 range_high_type
= TYPE_TARGET_TYPE (range_high_type
);
2017 if ((range_low_type
->code () != range_high_type
->code ())
2018 || (range_low_type
->code () == TYPE_CODE_ENUM
2019 && (range_low_type
!= range_high_type
)))
2020 /* different element modes. */
2021 error (_("POWERSET tuple elements of different mode"));
2022 if ((check_type
->code () != range_low_type
->code ())
2023 || (check_type
->code () == TYPE_CODE_ENUM
2024 && range_low_type
!= check_type
))
2025 error (_("incompatible POWERSET tuple elements"));
2026 if (range_low
> range_high
)
2028 warning (_("empty POWERSET tuple range"));
2031 if (range_low
< low_bound
|| range_high
> high_bound
)
2032 error (_("POWERSET tuple element out of range"));
2033 range_low
-= low_bound
;
2034 range_high
-= low_bound
;
2035 for (; range_low
<= range_high
; range_low
++)
2037 int bit_index
= (unsigned) range_low
% TARGET_CHAR_BIT
;
2039 if (gdbarch_byte_order (exp
->gdbarch
) == BFD_ENDIAN_BIG
)
2040 bit_index
= TARGET_CHAR_BIT
- 1 - bit_index
;
2041 valaddr
[(unsigned) range_low
/ TARGET_CHAR_BIT
]
2048 argvec
= XALLOCAVEC (struct value
*, nargs
);
2049 for (tem
= 0; tem
< nargs
; tem
++)
2051 /* Ensure that array expressions are coerced into pointer
2053 argvec
[tem
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
2055 if (noside
== EVAL_SKIP
)
2056 return eval_skip_value (exp
);
2057 return value_array (tem2
, tem3
, argvec
);
2061 struct value
*array
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2062 struct value
*low
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2063 struct value
*upper
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2064 return eval_op_ternop (expect_type
, exp
, noside
, array
, low
, upper
);
2068 /* Skip third and second args to evaluate the first one. */
2069 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2070 if (value_logical_not (arg1
))
2072 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2073 return evaluate_subexp (nullptr, exp
, pos
, noside
);
2077 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2078 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2082 case OP_OBJC_SELECTOR
:
2083 { /* Objective C @selector operator. */
2084 char *sel
= &exp
->elts
[pc
+ 2].string
;
2085 int len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2087 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
2089 sel
[len
] = 0; /* Make sure it's terminated. */
2091 return eval_op_objc_selector (expect_type
, exp
, noside
, sel
);
2094 case OP_OBJC_MSGCALL
:
2095 { /* Objective C message (method) call. */
2097 CORE_ADDR responds_selector
= 0;
2098 CORE_ADDR method_selector
= 0;
2100 CORE_ADDR selector
= 0;
2102 int struct_return
= 0;
2103 enum noside sub_no_side
= EVAL_NORMAL
;
2105 struct value
*msg_send
= NULL
;
2106 struct value
*msg_send_stret
= NULL
;
2107 int gnu_runtime
= 0;
2109 struct value
*target
= NULL
;
2110 struct value
*method
= NULL
;
2111 struct value
*called_method
= NULL
;
2113 struct type
*selector_type
= NULL
;
2114 struct type
*long_type
;
2116 struct value
*ret
= NULL
;
2119 selector
= exp
->elts
[pc
+ 1].longconst
;
2120 nargs
= exp
->elts
[pc
+ 2].longconst
;
2121 argvec
= XALLOCAVEC (struct value
*, nargs
+ 5);
2125 long_type
= builtin_type (exp
->gdbarch
)->builtin_long
;
2126 selector_type
= builtin_type (exp
->gdbarch
)->builtin_data_ptr
;
2128 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2129 sub_no_side
= EVAL_NORMAL
;
2131 sub_no_side
= noside
;
2133 target
= evaluate_subexp (selector_type
, exp
, pos
, sub_no_side
);
2135 if (value_as_long (target
) == 0)
2136 return value_from_longest (long_type
, 0);
2138 if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0).minsym
)
2141 /* Find the method dispatch (Apple runtime) or method lookup
2142 (GNU runtime) function for Objective-C. These will be used
2143 to lookup the symbol information for the method. If we
2144 can't find any symbol information, then we'll use these to
2145 call the method, otherwise we can call the method
2146 directly. The msg_send_stret function is used in the special
2147 case of a method that returns a structure (Apple runtime
2151 type
= selector_type
;
2153 type
= lookup_function_type (type
);
2154 type
= lookup_pointer_type (type
);
2155 type
= lookup_function_type (type
);
2156 type
= lookup_pointer_type (type
);
2158 msg_send
= find_function_in_inferior ("objc_msg_lookup", NULL
);
2160 = find_function_in_inferior ("objc_msg_lookup", NULL
);
2162 msg_send
= value_from_pointer (type
, value_as_address (msg_send
));
2163 msg_send_stret
= value_from_pointer (type
,
2164 value_as_address (msg_send_stret
));
2168 msg_send
= find_function_in_inferior ("objc_msgSend", NULL
);
2169 /* Special dispatcher for methods returning structs. */
2171 = find_function_in_inferior ("objc_msgSend_stret", NULL
);
2174 /* Verify the target object responds to this method. The
2175 standard top-level 'Object' class uses a different name for
2176 the verification method than the non-standard, but more
2177 often used, 'NSObject' class. Make sure we check for both. */
2180 = lookup_child_selector (exp
->gdbarch
, "respondsToSelector:");
2181 if (responds_selector
== 0)
2183 = lookup_child_selector (exp
->gdbarch
, "respondsTo:");
2185 if (responds_selector
== 0)
2186 error (_("no 'respondsTo:' or 'respondsToSelector:' method"));
2189 = lookup_child_selector (exp
->gdbarch
, "methodForSelector:");
2190 if (method_selector
== 0)
2192 = lookup_child_selector (exp
->gdbarch
, "methodFor:");
2194 if (method_selector
== 0)
2195 error (_("no 'methodFor:' or 'methodForSelector:' method"));
2197 /* Call the verification method, to make sure that the target
2198 class implements the desired method. */
2200 argvec
[0] = msg_send
;
2202 argvec
[2] = value_from_longest (long_type
, responds_selector
);
2203 argvec
[3] = value_from_longest (long_type
, selector
);
2206 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2209 /* Function objc_msg_lookup returns a pointer. */
2211 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2213 if (value_as_long (ret
) == 0)
2214 error (_("Target does not respond to this message selector."));
2216 /* Call "methodForSelector:" method, to get the address of a
2217 function method that implements this selector for this
2218 class. If we can find a symbol at that address, then we
2219 know the return type, parameter types etc. (that's a good
2222 argvec
[0] = msg_send
;
2224 argvec
[2] = value_from_longest (long_type
, method_selector
);
2225 argvec
[3] = value_from_longest (long_type
, selector
);
2228 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2232 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2235 /* ret should now be the selector. */
2237 addr
= value_as_long (ret
);
2240 struct symbol
*sym
= NULL
;
2242 /* The address might point to a function descriptor;
2243 resolve it to the actual code address instead. */
2244 addr
= gdbarch_convert_from_func_ptr_addr (exp
->gdbarch
, addr
,
2245 current_top_target ());
2247 /* Is it a high_level symbol? */
2248 sym
= find_pc_function (addr
);
2250 method
= value_of_variable (sym
, 0);
2253 /* If we found a method with symbol information, check to see
2254 if it returns a struct. Otherwise assume it doesn't. */
2259 struct type
*val_type
;
2261 funaddr
= find_function_addr (method
, &val_type
);
2263 block_for_pc (funaddr
);
2265 val_type
= check_typedef (val_type
);
2267 if ((val_type
== NULL
)
2268 || (val_type
->code () == TYPE_CODE_ERROR
))
2270 if (expect_type
!= NULL
)
2271 val_type
= expect_type
;
2274 struct_return
= using_struct_return (exp
->gdbarch
, method
,
2277 else if (expect_type
!= NULL
)
2279 struct_return
= using_struct_return (exp
->gdbarch
, NULL
,
2280 check_typedef (expect_type
));
2283 /* Found a function symbol. Now we will substitute its
2284 value in place of the message dispatcher (obj_msgSend),
2285 so that we call the method directly instead of thru
2286 the dispatcher. The main reason for doing this is that
2287 we can now evaluate the return value and parameter values
2288 according to their known data types, in case we need to
2289 do things like promotion, dereferencing, special handling
2290 of structs and doubles, etc.
2292 We want to use the type signature of 'method', but still
2293 jump to objc_msgSend() or objc_msgSend_stret() to better
2294 mimic the behavior of the runtime. */
2298 if (value_type (method
)->code () != TYPE_CODE_FUNC
)
2299 error (_("method address has symbol information "
2300 "with non-function type; skipping"));
2302 /* Create a function pointer of the appropriate type, and
2303 replace its value with the value of msg_send or
2304 msg_send_stret. We must use a pointer here, as
2305 msg_send and msg_send_stret are of pointer type, and
2306 the representation may be different on systems that use
2307 function descriptors. */
2310 = value_from_pointer (lookup_pointer_type (value_type (method
)),
2311 value_as_address (msg_send_stret
));
2314 = value_from_pointer (lookup_pointer_type (value_type (method
)),
2315 value_as_address (msg_send
));
2320 called_method
= msg_send_stret
;
2322 called_method
= msg_send
;
2325 if (noside
== EVAL_SKIP
)
2326 return eval_skip_value (exp
);
2328 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2330 /* If the return type doesn't look like a function type,
2331 call an error. This can happen if somebody tries to
2332 turn a variable into a function call. This is here
2333 because people often want to call, eg, strcmp, which
2334 gdb doesn't know is a function. If gdb isn't asked for
2335 it's opinion (ie. through "whatis"), it won't offer
2338 struct type
*callee_type
= value_type (called_method
);
2340 if (callee_type
&& callee_type
->code () == TYPE_CODE_PTR
)
2341 callee_type
= TYPE_TARGET_TYPE (callee_type
);
2342 callee_type
= TYPE_TARGET_TYPE (callee_type
);
2346 if ((callee_type
->code () == TYPE_CODE_ERROR
) && expect_type
)
2347 return allocate_value (expect_type
);
2349 return allocate_value (callee_type
);
2352 error (_("Expression of type other than "
2353 "\"method returning ...\" used as a method"));
2356 /* Now depending on whether we found a symbol for the method,
2357 we will either call the runtime dispatcher or the method
2360 argvec
[0] = called_method
;
2362 argvec
[2] = value_from_longest (long_type
, selector
);
2363 /* User-supplied arguments. */
2364 for (tem
= 0; tem
< nargs
; tem
++)
2365 argvec
[tem
+ 3] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
2366 argvec
[tem
+ 3] = 0;
2368 auto call_args
= gdb::make_array_view (argvec
+ 1, nargs
+ 2);
2370 if (gnu_runtime
&& (method
!= NULL
))
2372 /* Function objc_msg_lookup returns a pointer. */
2373 deprecated_set_value_type (argvec
[0],
2374 lookup_pointer_type (lookup_function_type (value_type (argvec
[0]))));
2375 argvec
[0] = call_function_by_hand (argvec
[0], NULL
, call_args
);
2378 return call_function_by_hand (argvec
[0], NULL
, call_args
);
2383 return evaluate_funcall (expect_type
, exp
, pos
, noside
);
2386 /* We have a complex number, There should be 2 floating
2387 point numbers that compose it. */
2389 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2390 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2392 return value_literal_complex (arg1
, arg2
, exp
->elts
[pc
+ 1].type
);
2394 case STRUCTOP_STRUCT
:
2395 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2396 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
2397 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2398 return eval_op_structop_struct (expect_type
, exp
, noside
, arg1
,
2399 &exp
->elts
[pc
+ 2].string
);
2402 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2403 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
2404 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2405 return eval_op_structop_ptr (expect_type
, exp
, noside
, op
, arg1
,
2406 &exp
->elts
[pc
+ 2].string
);
2408 case STRUCTOP_MEMBER
:
2410 if (op
== STRUCTOP_MEMBER
)
2411 arg1
= evaluate_subexp_for_address (exp
, pos
, noside
);
2413 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2415 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2417 return eval_op_member (expect_type
, exp
, noside
, arg1
, arg2
);
2421 type_instance_flags flags
2422 = (type_instance_flag_value
) longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2423 nargs
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
2424 arg_types
= (struct type
**) alloca (nargs
* sizeof (struct type
*));
2425 for (ix
= 0; ix
< nargs
; ++ix
)
2426 arg_types
[ix
] = exp
->elts
[pc
+ 2 + ix
+ 1].type
;
2428 fake_method
fake_expect_type (flags
, nargs
, arg_types
);
2429 *(pos
) += 4 + nargs
;
2430 return evaluate_subexp_standard (fake_expect_type
.type (), exp
, pos
,
2435 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2436 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2437 return eval_op_concat (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2440 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2441 /* Special-case assignments where the left-hand-side is a
2442 convenience variable -- in these, don't bother setting an
2443 expected type. This avoids a weird case where re-assigning a
2444 string or array to an internal variable could error with "Too
2445 many array elements". */
2446 arg2
= evaluate_subexp (VALUE_LVAL (arg1
) == lval_internalvar
2448 : value_type (arg1
),
2451 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2453 if (binop_user_defined_p (op
, arg1
, arg2
))
2454 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2456 return value_assign (arg1
, arg2
);
2458 case BINOP_ASSIGN_MODIFY
:
2460 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2461 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2462 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2464 op
= exp
->elts
[pc
+ 1].opcode
;
2465 if (binop_user_defined_p (op
, arg1
, arg2
))
2466 return value_x_binop (arg1
, arg2
, BINOP_ASSIGN_MODIFY
, op
, noside
);
2467 else if (op
== BINOP_ADD
&& ptrmath_type_p (exp
->language_defn
,
2469 && is_integral_type (value_type (arg2
)))
2470 arg2
= value_ptradd (arg1
, value_as_long (arg2
));
2471 else if (op
== BINOP_SUB
&& ptrmath_type_p (exp
->language_defn
,
2473 && is_integral_type (value_type (arg2
)))
2474 arg2
= value_ptradd (arg1
, - value_as_long (arg2
));
2477 struct value
*tmp
= arg1
;
2479 /* For shift and integer exponentiation operations,
2480 only promote the first argument. */
2481 if ((op
== BINOP_LSH
|| op
== BINOP_RSH
|| op
== BINOP_EXP
)
2482 && is_integral_type (value_type (arg2
)))
2483 unop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
);
2485 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2487 arg2
= value_binop (tmp
, arg2
, op
);
2489 return value_assign (arg1
, arg2
);
2492 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2493 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2494 return eval_op_add (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2497 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2498 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2499 return eval_op_sub (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2509 case BINOP_BITWISE_AND
:
2510 case BINOP_BITWISE_IOR
:
2511 case BINOP_BITWISE_XOR
:
2512 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2513 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2514 return eval_op_binary (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2516 case BINOP_SUBSCRIPT
:
2517 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2518 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2519 return eval_op_subscript (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2521 case MULTI_SUBSCRIPT
:
2523 nargs
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2524 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2525 argvec
= XALLOCAVEC (struct value
*, nargs
);
2526 for (ix
= 0; ix
< nargs
; ++ix
)
2527 argvec
[ix
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
2528 if (noside
== EVAL_SKIP
)
2530 for (ix
= 0; ix
< nargs
; ++ix
)
2534 if (binop_user_defined_p (op
, arg1
, arg2
))
2536 arg1
= value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2540 arg1
= coerce_ref (arg1
);
2541 type
= check_typedef (value_type (arg1
));
2543 switch (type
->code ())
2546 case TYPE_CODE_ARRAY
:
2547 case TYPE_CODE_STRING
:
2548 arg1
= value_subscript (arg1
, value_as_long (arg2
));
2553 error (_("cannot subscript something of type `%s'"),
2556 error (_("cannot subscript requested type"));
2562 case BINOP_LOGICAL_AND
:
2563 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2564 if (noside
== EVAL_SKIP
)
2566 evaluate_subexp (nullptr, exp
, pos
, noside
);
2567 return eval_skip_value (exp
);
2571 arg2
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2574 if (binop_user_defined_p (op
, arg1
, arg2
))
2576 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2577 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2581 tem
= value_logical_not (arg1
);
2583 = evaluate_subexp (nullptr, exp
, pos
, (tem
? EVAL_SKIP
: noside
));
2584 type
= language_bool_type (exp
->language_defn
, exp
->gdbarch
);
2585 return value_from_longest (type
,
2586 (LONGEST
) (!tem
&& !value_logical_not (arg2
)));
2589 case BINOP_LOGICAL_OR
:
2590 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2591 if (noside
== EVAL_SKIP
)
2593 evaluate_subexp (nullptr, exp
, pos
, noside
);
2594 return eval_skip_value (exp
);
2598 arg2
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2601 if (binop_user_defined_p (op
, arg1
, arg2
))
2603 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2604 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2608 tem
= value_logical_not (arg1
);
2610 = evaluate_subexp (nullptr, exp
, pos
, (!tem
? EVAL_SKIP
: noside
));
2611 type
= language_bool_type (exp
->language_defn
, exp
->gdbarch
);
2612 return value_from_longest (type
,
2613 (LONGEST
) (!tem
|| !value_logical_not (arg2
)));
2617 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2618 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2619 return eval_op_equal (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2621 case BINOP_NOTEQUAL
:
2622 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2623 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2624 return eval_op_notequal (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2627 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2628 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2629 return eval_op_less (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2632 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2633 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2634 return eval_op_gtr (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2637 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2638 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2639 return eval_op_geq (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2642 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2643 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2644 return eval_op_leq (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2647 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2648 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2649 return eval_op_repeat (expect_type
, exp
, noside
, arg1
, arg2
);
2652 evaluate_subexp (nullptr, exp
, pos
, noside
);
2653 return evaluate_subexp (nullptr, exp
, pos
, noside
);
2656 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2657 return eval_op_plus (expect_type
, exp
, noside
, op
, arg1
);
2660 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2661 return eval_op_neg (expect_type
, exp
, noside
, op
, arg1
);
2663 case UNOP_COMPLEMENT
:
2664 /* C++: check for and handle destructor names. */
2666 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2667 return eval_op_complement (expect_type
, exp
, noside
, op
, arg1
);
2669 case UNOP_LOGICAL_NOT
:
2670 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2671 if (noside
== EVAL_SKIP
)
2672 return eval_skip_value (exp
);
2673 if (unop_user_defined_p (op
, arg1
))
2674 return value_x_unop (arg1
, op
, noside
);
2677 type
= language_bool_type (exp
->language_defn
, exp
->gdbarch
);
2678 return value_from_longest (type
, (LONGEST
) value_logical_not (arg1
));
2682 if (expect_type
&& expect_type
->code () == TYPE_CODE_PTR
)
2683 expect_type
= TYPE_TARGET_TYPE (check_typedef (expect_type
));
2684 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2685 type
= check_typedef (value_type (arg1
));
2686 if (type
->code () == TYPE_CODE_METHODPTR
2687 || type
->code () == TYPE_CODE_MEMBERPTR
)
2688 error (_("Attempt to dereference pointer "
2689 "to member without an object"));
2690 if (noside
== EVAL_SKIP
)
2691 return eval_skip_value (exp
);
2692 if (unop_user_defined_p (op
, arg1
))
2693 return value_x_unop (arg1
, op
, noside
);
2694 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2696 type
= check_typedef (value_type (arg1
));
2698 /* If the type pointed to is dynamic then in order to resolve the
2699 dynamic properties we must actually dereference the pointer.
2700 There is a risk that this dereference will have side-effects
2701 in the inferior, but being able to print accurate type
2702 information seems worth the risk. */
2703 if ((type
->code () != TYPE_CODE_PTR
2704 && !TYPE_IS_REFERENCE (type
))
2705 || !is_dynamic_type (TYPE_TARGET_TYPE (type
)))
2707 if (type
->code () == TYPE_CODE_PTR
2708 || TYPE_IS_REFERENCE (type
)
2709 /* In C you can dereference an array to get the 1st elt. */
2710 || type
->code () == TYPE_CODE_ARRAY
)
2711 return value_zero (TYPE_TARGET_TYPE (type
),
2713 else if (type
->code () == TYPE_CODE_INT
)
2714 /* GDB allows dereferencing an int. */
2715 return value_zero (builtin_type (exp
->gdbarch
)->builtin_int
,
2718 error (_("Attempt to take contents of a non-pointer value."));
2722 /* Allow * on an integer so we can cast it to whatever we want.
2723 This returns an int, which seems like the most C-like thing to
2724 do. "long long" variables are rare enough that
2725 BUILTIN_TYPE_LONGEST would seem to be a mistake. */
2726 if (type
->code () == TYPE_CODE_INT
)
2727 return value_at_lazy (builtin_type (exp
->gdbarch
)->builtin_int
,
2728 (CORE_ADDR
) value_as_address (arg1
));
2729 return value_ind (arg1
);
2732 /* C++: check for and handle pointer to members. */
2734 if (noside
== EVAL_SKIP
)
2736 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2737 return eval_skip_value (exp
);
2740 return evaluate_subexp_for_address (exp
, pos
, noside
);
2743 if (noside
== EVAL_SKIP
)
2745 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2746 return eval_skip_value (exp
);
2748 return evaluate_subexp_for_sizeof (exp
, pos
, noside
);
2753 evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
));
2754 /* FIXME: This should be size_t. */
2755 struct type
*size_type
= builtin_type (exp
->gdbarch
)->builtin_int
;
2756 ULONGEST align
= type_align (type
);
2758 error (_("could not determine alignment of type"));
2759 return value_from_longest (size_type
, align
);
2764 type
= exp
->elts
[pc
+ 1].type
;
2765 return evaluate_subexp_for_cast (exp
, pos
, noside
, type
);
2767 case UNOP_CAST_TYPE
:
2768 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2769 type
= value_type (arg1
);
2770 return evaluate_subexp_for_cast (exp
, pos
, noside
, type
);
2772 case UNOP_DYNAMIC_CAST
:
2773 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2774 type
= value_type (arg1
);
2775 arg1
= evaluate_subexp (type
, exp
, pos
, noside
);
2776 if (noside
== EVAL_SKIP
)
2777 return eval_skip_value (exp
);
2778 return value_dynamic_cast (type
, arg1
);
2780 case UNOP_REINTERPRET_CAST
:
2781 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2782 type
= value_type (arg1
);
2783 arg1
= evaluate_subexp (type
, exp
, pos
, noside
);
2784 if (noside
== EVAL_SKIP
)
2785 return eval_skip_value (exp
);
2786 return value_reinterpret_cast (type
, arg1
);
2790 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2791 if (noside
== EVAL_SKIP
)
2792 return eval_skip_value (exp
);
2793 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2794 return value_zero (exp
->elts
[pc
+ 1].type
, lval_memory
);
2796 return value_at_lazy (exp
->elts
[pc
+ 1].type
,
2797 value_as_address (arg1
));
2799 case UNOP_MEMVAL_TYPE
:
2800 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2801 type
= value_type (arg1
);
2802 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2803 if (noside
== EVAL_SKIP
)
2804 return eval_skip_value (exp
);
2805 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2806 return value_zero (type
, lval_memory
);
2808 return value_at_lazy (type
, value_as_address (arg1
));
2810 case UNOP_PREINCREMENT
:
2811 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2812 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2814 else if (unop_user_defined_p (op
, arg1
))
2816 return value_x_unop (arg1
, op
, noside
);
2820 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2821 arg2
= value_ptradd (arg1
, 1);
2824 struct value
*tmp
= arg1
;
2826 arg2
= value_one (value_type (arg1
));
2827 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2828 arg2
= value_binop (tmp
, arg2
, BINOP_ADD
);
2831 return value_assign (arg1
, arg2
);
2834 case UNOP_PREDECREMENT
:
2835 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2836 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2838 else if (unop_user_defined_p (op
, arg1
))
2840 return value_x_unop (arg1
, op
, noside
);
2844 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2845 arg2
= value_ptradd (arg1
, -1);
2848 struct value
*tmp
= arg1
;
2850 arg2
= value_one (value_type (arg1
));
2851 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2852 arg2
= value_binop (tmp
, arg2
, BINOP_SUB
);
2855 return value_assign (arg1
, arg2
);
2858 case UNOP_POSTINCREMENT
:
2859 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2860 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2862 else if (unop_user_defined_p (op
, arg1
))
2864 return value_x_unop (arg1
, op
, noside
);
2868 arg3
= value_non_lval (arg1
);
2870 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2871 arg2
= value_ptradd (arg1
, 1);
2874 struct value
*tmp
= arg1
;
2876 arg2
= value_one (value_type (arg1
));
2877 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2878 arg2
= value_binop (tmp
, arg2
, BINOP_ADD
);
2881 value_assign (arg1
, arg2
);
2885 case UNOP_POSTDECREMENT
:
2886 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2887 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2889 else if (unop_user_defined_p (op
, arg1
))
2891 return value_x_unop (arg1
, op
, noside
);
2895 arg3
= value_non_lval (arg1
);
2897 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2898 arg2
= value_ptradd (arg1
, -1);
2901 struct value
*tmp
= arg1
;
2903 arg2
= value_one (value_type (arg1
));
2904 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2905 arg2
= value_binop (tmp
, arg2
, BINOP_SUB
);
2908 value_assign (arg1
, arg2
);
2914 return value_of_this (exp
->language_defn
);
2917 /* The value is not supposed to be used. This is here to make it
2918 easier to accommodate expressions that contain types. */
2920 if (noside
== EVAL_SKIP
)
2921 return eval_skip_value (exp
);
2922 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2923 return allocate_value (exp
->elts
[pc
+ 1].type
);
2925 error (_("Attempt to use a type name as an expression"));
2929 if (noside
== EVAL_SKIP
)
2931 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2932 return eval_skip_value (exp
);
2934 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2936 enum exp_opcode sub_op
= exp
->elts
[*pos
].opcode
;
2937 struct value
*result
;
2939 result
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2941 /* 'decltype' has special semantics for lvalues. */
2942 if (op
== OP_DECLTYPE
2943 && (sub_op
== BINOP_SUBSCRIPT
2944 || sub_op
== STRUCTOP_MEMBER
2945 || sub_op
== STRUCTOP_MPTR
2946 || sub_op
== UNOP_IND
2947 || sub_op
== STRUCTOP_STRUCT
2948 || sub_op
== STRUCTOP_PTR
2949 || sub_op
== OP_SCOPE
))
2951 type
= value_type (result
);
2953 if (!TYPE_IS_REFERENCE (type
))
2955 type
= lookup_lvalue_reference_type (type
);
2956 result
= allocate_value (type
);
2963 error (_("Attempt to use a type as an expression"));
2967 struct value
*result
;
2968 enum exp_opcode sub_op
= exp
->elts
[*pos
].opcode
;
2970 if (sub_op
== OP_TYPE
|| sub_op
== OP_DECLTYPE
|| sub_op
== OP_TYPEOF
)
2971 result
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2973 result
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2975 if (noside
!= EVAL_NORMAL
)
2976 return allocate_value (cplus_typeid_type (exp
->gdbarch
));
2978 return cplus_typeid (result
);
2982 /* Removing this case and compiling with gcc -Wall reveals that
2983 a lot of cases are hitting this case. Some of these should
2984 probably be removed from expression.h; others are legitimate
2985 expressions which are (apparently) not fully implemented.
2987 If there are any cases landing here which mean a user error,
2988 then they should be separate cases, with more descriptive
2991 error (_("GDB does not (yet) know how to "
2992 "evaluate that kind of expression"));
2995 gdb_assert_not_reached ("missed return?");
2998 /* Evaluate a subexpression of EXP, at index *POS,
2999 and return the address of that subexpression.
3000 Advance *POS over the subexpression.
3001 If the subexpression isn't an lvalue, get an error.
3002 NOSIDE may be EVAL_AVOID_SIDE_EFFECTS;
3003 then only the type of the result need be correct. */
3005 static struct value
*
3006 evaluate_subexp_for_address (struct expression
*exp
, int *pos
,
3016 op
= exp
->elts
[pc
].opcode
;
3022 x
= evaluate_subexp (nullptr, exp
, pos
, noside
);
3024 /* We can't optimize out "&*" if there's a user-defined operator*. */
3025 if (unop_user_defined_p (op
, x
))
3027 x
= value_x_unop (x
, op
, noside
);
3028 goto default_case_after_eval
;
3031 return coerce_array (x
);
3035 return value_cast (lookup_pointer_type (exp
->elts
[pc
+ 1].type
),
3036 evaluate_subexp (nullptr, exp
, pos
, noside
));
3038 case UNOP_MEMVAL_TYPE
:
3043 x
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3044 type
= value_type (x
);
3045 return value_cast (lookup_pointer_type (type
),
3046 evaluate_subexp (nullptr, exp
, pos
, noside
));
3050 var
= exp
->elts
[pc
+ 2].symbol
;
3052 /* C++: The "address" of a reference should yield the address
3053 * of the object pointed to. Let value_addr() deal with it. */
3054 if (TYPE_IS_REFERENCE (SYMBOL_TYPE (var
)))
3058 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3061 lookup_pointer_type (SYMBOL_TYPE (var
));
3062 enum address_class sym_class
= SYMBOL_CLASS (var
);
3064 if (sym_class
== LOC_CONST
3065 || sym_class
== LOC_CONST_BYTES
3066 || sym_class
== LOC_REGISTER
)
3067 error (_("Attempt to take address of register or constant."));
3070 value_zero (type
, not_lval
);
3073 return address_of_variable (var
, exp
->elts
[pc
+ 1].block
);
3075 case OP_VAR_MSYM_VALUE
:
3079 value
*val
= evaluate_var_msym_value (noside
,
3080 exp
->elts
[pc
+ 1].objfile
,
3081 exp
->elts
[pc
+ 2].msymbol
);
3082 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3084 struct type
*type
= lookup_pointer_type (value_type (val
));
3085 return value_zero (type
, not_lval
);
3088 return value_addr (val
);
3092 tem
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
3093 (*pos
) += 5 + BYTES_TO_EXP_ELEM (tem
+ 1);
3094 x
= value_aggregate_elt (exp
->elts
[pc
+ 1].type
,
3095 &exp
->elts
[pc
+ 3].string
,
3098 error (_("There is no field named %s"), &exp
->elts
[pc
+ 3].string
);
3103 x
= evaluate_subexp (nullptr, exp
, pos
, noside
);
3104 default_case_after_eval
:
3105 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3107 struct type
*type
= check_typedef (value_type (x
));
3109 if (TYPE_IS_REFERENCE (type
))
3110 return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
3112 else if (VALUE_LVAL (x
) == lval_memory
|| value_must_coerce_to_target (x
))
3113 return value_zero (lookup_pointer_type (value_type (x
)),
3116 error (_("Attempt to take address of "
3117 "value not located in memory."));
3119 return value_addr (x
);
3123 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
3124 When used in contexts where arrays will be coerced anyway, this is
3125 equivalent to `evaluate_subexp' but much faster because it avoids
3126 actually fetching array contents (perhaps obsolete now that we have
3129 Note that we currently only do the coercion for C expressions, where
3130 arrays are zero based and the coercion is correct. For other languages,
3131 with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION
3132 to decide if coercion is appropriate. */
3135 evaluate_subexp_with_coercion (struct expression
*exp
,
3136 int *pos
, enum noside noside
)
3145 op
= exp
->elts
[pc
].opcode
;
3150 var
= exp
->elts
[pc
+ 2].symbol
;
3151 type
= check_typedef (SYMBOL_TYPE (var
));
3152 if (type
->code () == TYPE_CODE_ARRAY
3153 && !type
->is_vector ()
3154 && CAST_IS_CONVERSION (exp
->language_defn
))
3157 val
= address_of_variable (var
, exp
->elts
[pc
+ 1].block
);
3158 return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
3164 return evaluate_subexp (nullptr, exp
, pos
, noside
);
3168 /* Evaluate a subexpression of EXP, at index *POS,
3169 and return a value for the size of that subexpression.
3170 Advance *POS over the subexpression. If NOSIDE is EVAL_NORMAL
3171 we allow side-effects on the operand if its type is a variable
3174 static struct value
*
3175 evaluate_subexp_for_sizeof (struct expression
*exp
, int *pos
,
3178 /* FIXME: This should be size_t. */
3179 struct type
*size_type
= builtin_type (exp
->gdbarch
)->builtin_int
;
3186 op
= exp
->elts
[pc
].opcode
;
3190 /* This case is handled specially
3191 so that we avoid creating a value for the result type.
3192 If the result type is very big, it's desirable not to
3193 create a value unnecessarily. */
3196 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3197 type
= check_typedef (value_type (val
));
3198 if (type
->code () != TYPE_CODE_PTR
3199 && !TYPE_IS_REFERENCE (type
)
3200 && type
->code () != TYPE_CODE_ARRAY
)
3201 error (_("Attempt to take contents of a non-pointer value."));
3202 type
= TYPE_TARGET_TYPE (type
);
3203 if (is_dynamic_type (type
))
3204 type
= value_type (value_ind (val
));
3205 return value_from_longest (size_type
, (LONGEST
) TYPE_LENGTH (type
));
3209 type
= exp
->elts
[pc
+ 1].type
;
3212 case UNOP_MEMVAL_TYPE
:
3214 val
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3215 type
= value_type (val
);
3219 type
= SYMBOL_TYPE (exp
->elts
[pc
+ 2].symbol
);
3220 if (is_dynamic_type (type
))
3222 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_NORMAL
);
3223 type
= value_type (val
);
3224 if (type
->code () == TYPE_CODE_ARRAY
)
3226 if (type_not_allocated (type
) || type_not_associated (type
))
3227 return value_zero (size_type
, not_lval
);
3228 else if (is_dynamic_type (type
->index_type ())
3229 && type
->bounds ()->high
.kind () == PROP_UNDEFINED
)
3230 return allocate_optimized_out_value (size_type
);
3237 case OP_VAR_MSYM_VALUE
:
3241 minimal_symbol
*msymbol
= exp
->elts
[pc
+ 2].msymbol
;
3242 value
*mval
= evaluate_var_msym_value (noside
,
3243 exp
->elts
[pc
+ 1].objfile
,
3246 type
= value_type (mval
);
3247 if (type
->code () == TYPE_CODE_ERROR
)
3248 error_unknown_type (msymbol
->print_name ());
3250 return value_from_longest (size_type
, TYPE_LENGTH (type
));
3254 /* Deal with the special case if NOSIDE is EVAL_NORMAL and the resulting
3255 type of the subscript is a variable length array type. In this case we
3256 must re-evaluate the right hand side of the subscription to allow
3258 case BINOP_SUBSCRIPT
:
3259 if (noside
== EVAL_NORMAL
)
3261 int npc
= (*pos
) + 1;
3263 val
= evaluate_subexp (nullptr, exp
, &npc
, EVAL_AVOID_SIDE_EFFECTS
);
3264 type
= check_typedef (value_type (val
));
3265 if (type
->code () == TYPE_CODE_ARRAY
)
3267 type
= check_typedef (TYPE_TARGET_TYPE (type
));
3268 if (type
->code () == TYPE_CODE_ARRAY
)
3270 type
= type
->index_type ();
3271 /* Only re-evaluate the right hand side if the resulting type
3272 is a variable length type. */
3273 if (type
->bounds ()->flag_bound_evaluated
)
3275 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_NORMAL
);
3276 return value_from_longest
3277 (size_type
, (LONGEST
) TYPE_LENGTH (value_type (val
)));
3286 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3287 type
= value_type (val
);
3291 /* $5.3.3/2 of the C++ Standard (n3290 draft) says of sizeof:
3292 "When applied to a reference or a reference type, the result is
3293 the size of the referenced type." */
3294 type
= check_typedef (type
);
3295 if (exp
->language_defn
->la_language
== language_cplus
3296 && (TYPE_IS_REFERENCE (type
)))
3297 type
= check_typedef (TYPE_TARGET_TYPE (type
));
3298 return value_from_longest (size_type
, (LONGEST
) TYPE_LENGTH (type
));
3301 /* Evaluate a subexpression of EXP, at index *POS, and return a value
3302 for that subexpression cast to TO_TYPE. Advance *POS over the
3306 evaluate_subexp_for_cast (expression
*exp
, int *pos
,
3308 struct type
*to_type
)
3312 /* Don't let symbols be evaluated with evaluate_subexp because that
3313 throws an "unknown type" error for no-debug data symbols.
3314 Instead, we want the cast to reinterpret the symbol. */
3315 if (exp
->elts
[pc
].opcode
== OP_VAR_MSYM_VALUE
3316 || exp
->elts
[pc
].opcode
== OP_VAR_VALUE
)
3321 if (exp
->elts
[pc
].opcode
== OP_VAR_MSYM_VALUE
)
3323 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3324 return value_zero (to_type
, not_lval
);
3326 val
= evaluate_var_msym_value (noside
,
3327 exp
->elts
[pc
+ 1].objfile
,
3328 exp
->elts
[pc
+ 2].msymbol
);
3331 val
= evaluate_var_value (noside
,
3332 exp
->elts
[pc
+ 1].block
,
3333 exp
->elts
[pc
+ 2].symbol
);
3335 if (noside
== EVAL_SKIP
)
3336 return eval_skip_value (exp
);
3338 val
= value_cast (to_type
, val
);
3340 /* Don't allow e.g. '&(int)var_with_no_debug_info'. */
3341 if (VALUE_LVAL (val
) == lval_memory
)
3343 if (value_lazy (val
))
3344 value_fetch_lazy (val
);
3345 VALUE_LVAL (val
) = not_lval
;
3350 value
*val
= evaluate_subexp (to_type
, exp
, pos
, noside
);
3351 if (noside
== EVAL_SKIP
)
3352 return eval_skip_value (exp
);
3353 return value_cast (to_type
, val
);
3356 /* Parse a type expression in the string [P..P+LENGTH). */
3359 parse_and_eval_type (const char *p
, int length
)
3361 char *tmp
= (char *) alloca (length
+ 4);
3364 memcpy (tmp
+ 1, p
, length
);
3365 tmp
[length
+ 1] = ')';
3366 tmp
[length
+ 2] = '0';
3367 tmp
[length
+ 3] = '\0';
3368 expression_up expr
= parse_expression (tmp
);
3369 if (expr
->first_opcode () != UNOP_CAST
)
3370 error (_("Internal error in eval_type."));
3371 return expr
->elts
[1].type
;