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
);
1808 /* A helper function for UNOP_LOGICAL_NOT. */
1810 static struct value
*
1811 eval_op_lognot (struct type
*expect_type
, struct expression
*exp
,
1812 enum noside noside
, enum exp_opcode op
,
1815 if (noside
== EVAL_SKIP
)
1816 return eval_skip_value (exp
);
1817 if (unop_user_defined_p (op
, arg1
))
1818 return value_x_unop (arg1
, op
, noside
);
1821 struct type
*type
= language_bool_type (exp
->language_defn
,
1823 return value_from_longest (type
, (LONGEST
) value_logical_not (arg1
));
1828 evaluate_subexp_standard (struct type
*expect_type
,
1829 struct expression
*exp
, int *pos
,
1833 int tem
, tem2
, tem3
;
1835 struct value
*arg1
= NULL
;
1836 struct value
*arg2
= NULL
;
1840 struct value
**argvec
;
1842 struct type
**arg_types
;
1845 op
= exp
->elts
[pc
].opcode
;
1850 tem
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
1851 (*pos
) += 4 + BYTES_TO_EXP_ELEM (tem
+ 1);
1852 return eval_op_scope (expect_type
, exp
, noside
,
1853 exp
->elts
[pc
+ 1].type
,
1854 &exp
->elts
[pc
+ 3].string
);
1858 return value_from_longest (exp
->elts
[pc
+ 1].type
,
1859 exp
->elts
[pc
+ 2].longconst
);
1863 return value_from_contents (exp
->elts
[pc
+ 1].type
,
1864 exp
->elts
[pc
+ 2].floatconst
);
1870 symbol
*var
= exp
->elts
[pc
+ 2].symbol
;
1871 if (SYMBOL_TYPE (var
)->code () == TYPE_CODE_ERROR
)
1872 error_unknown_type (var
->print_name ());
1873 if (noside
!= EVAL_SKIP
)
1874 return evaluate_var_value (noside
, exp
->elts
[pc
+ 1].block
, var
);
1877 /* Return a dummy value of the correct type when skipping, so
1878 that parent functions know what is to be skipped. */
1879 return allocate_value (SYMBOL_TYPE (var
));
1883 case OP_VAR_MSYM_VALUE
:
1887 minimal_symbol
*msymbol
= exp
->elts
[pc
+ 2].msymbol
;
1888 return eval_op_var_msym_value (expect_type
, exp
, noside
,
1890 exp
->elts
[pc
+ 1].objfile
);
1893 case OP_VAR_ENTRY_VALUE
:
1897 struct symbol
*sym
= exp
->elts
[pc
+ 1].symbol
;
1899 return eval_op_var_entry_value (expect_type
, exp
, noside
, sym
);
1902 case OP_FUNC_STATIC_VAR
:
1903 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1904 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1905 if (noside
== EVAL_SKIP
)
1906 return eval_skip_value (exp
);
1909 value
*func
= evaluate_subexp_standard (NULL
, exp
, pos
, noside
);
1911 return eval_op_func_static_var (expect_type
, exp
, noside
, func
,
1912 &exp
->elts
[pc
+ 2].string
);
1918 access_value_history (longest_to_int (exp
->elts
[pc
+ 1].longconst
));
1922 const char *name
= &exp
->elts
[pc
+ 2].string
;
1924 (*pos
) += 3 + BYTES_TO_EXP_ELEM (exp
->elts
[pc
+ 1].longconst
+ 1);
1925 return eval_op_register (expect_type
, exp
, noside
, name
);
1929 type
= language_bool_type (exp
->language_defn
, exp
->gdbarch
);
1930 return value_from_longest (type
, exp
->elts
[pc
+ 1].longconst
);
1932 case OP_INTERNALVAR
:
1934 return value_of_internalvar (exp
->gdbarch
,
1935 exp
->elts
[pc
+ 1].internalvar
);
1938 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1939 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1940 return eval_op_string (expect_type
, exp
, noside
, tem
,
1941 &exp
->elts
[pc
+ 2].string
);
1943 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class
1944 NSString constant. */
1945 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1946 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
1947 if (noside
== EVAL_SKIP
)
1948 return eval_skip_value (exp
);
1949 return value_nsstring (exp
->gdbarch
, &exp
->elts
[pc
+ 2].string
, tem
+ 1);
1953 tem2
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
1954 tem3
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
1955 nargs
= tem3
- tem2
+ 1;
1956 type
= expect_type
? check_typedef (expect_type
) : nullptr;
1958 if (expect_type
!= nullptr && noside
!= EVAL_SKIP
1959 && type
->code () == TYPE_CODE_STRUCT
)
1961 struct value
*rec
= allocate_value (expect_type
);
1963 memset (value_contents_raw (rec
), '\0', TYPE_LENGTH (type
));
1964 return evaluate_struct_tuple (rec
, exp
, pos
, noside
, nargs
);
1967 if (expect_type
!= nullptr && noside
!= EVAL_SKIP
1968 && type
->code () == TYPE_CODE_ARRAY
)
1970 struct type
*range_type
= type
->index_type ();
1971 struct type
*element_type
= TYPE_TARGET_TYPE (type
);
1972 struct value
*array
= allocate_value (expect_type
);
1973 int element_size
= TYPE_LENGTH (check_typedef (element_type
));
1974 LONGEST low_bound
, high_bound
, index
;
1976 if (!get_discrete_bounds (range_type
, &low_bound
, &high_bound
))
1979 high_bound
= (TYPE_LENGTH (type
) / element_size
) - 1;
1982 memset (value_contents_raw (array
), 0, TYPE_LENGTH (expect_type
));
1983 for (tem
= nargs
; --nargs
>= 0;)
1985 struct value
*element
;
1987 element
= evaluate_subexp (element_type
, exp
, pos
, noside
);
1988 if (value_type (element
) != element_type
)
1989 element
= value_cast (element_type
, element
);
1990 if (index
> high_bound
)
1991 /* To avoid memory corruption. */
1992 error (_("Too many array elements"));
1993 memcpy (value_contents_raw (array
)
1994 + (index
- low_bound
) * element_size
,
1995 value_contents (element
),
2002 if (expect_type
!= nullptr && noside
!= EVAL_SKIP
2003 && type
->code () == TYPE_CODE_SET
)
2005 struct value
*set
= allocate_value (expect_type
);
2006 gdb_byte
*valaddr
= value_contents_raw (set
);
2007 struct type
*element_type
= type
->index_type ();
2008 struct type
*check_type
= element_type
;
2009 LONGEST low_bound
, high_bound
;
2011 /* Get targettype of elementtype. */
2012 while (check_type
->code () == TYPE_CODE_RANGE
2013 || check_type
->code () == TYPE_CODE_TYPEDEF
)
2014 check_type
= TYPE_TARGET_TYPE (check_type
);
2016 if (!get_discrete_bounds (element_type
, &low_bound
, &high_bound
))
2017 error (_("(power)set type with unknown size"));
2018 memset (valaddr
, '\0', TYPE_LENGTH (type
));
2019 for (tem
= 0; tem
< nargs
; tem
++)
2021 LONGEST range_low
, range_high
;
2022 struct type
*range_low_type
, *range_high_type
;
2023 struct value
*elem_val
;
2025 elem_val
= evaluate_subexp (element_type
, exp
, pos
, noside
);
2026 range_low_type
= range_high_type
= value_type (elem_val
);
2027 range_low
= range_high
= value_as_long (elem_val
);
2029 /* Check types of elements to avoid mixture of elements from
2030 different types. Also check if type of element is "compatible"
2031 with element type of powerset. */
2032 if (range_low_type
->code () == TYPE_CODE_RANGE
)
2033 range_low_type
= TYPE_TARGET_TYPE (range_low_type
);
2034 if (range_high_type
->code () == TYPE_CODE_RANGE
)
2035 range_high_type
= TYPE_TARGET_TYPE (range_high_type
);
2036 if ((range_low_type
->code () != range_high_type
->code ())
2037 || (range_low_type
->code () == TYPE_CODE_ENUM
2038 && (range_low_type
!= range_high_type
)))
2039 /* different element modes. */
2040 error (_("POWERSET tuple elements of different mode"));
2041 if ((check_type
->code () != range_low_type
->code ())
2042 || (check_type
->code () == TYPE_CODE_ENUM
2043 && range_low_type
!= check_type
))
2044 error (_("incompatible POWERSET tuple elements"));
2045 if (range_low
> range_high
)
2047 warning (_("empty POWERSET tuple range"));
2050 if (range_low
< low_bound
|| range_high
> high_bound
)
2051 error (_("POWERSET tuple element out of range"));
2052 range_low
-= low_bound
;
2053 range_high
-= low_bound
;
2054 for (; range_low
<= range_high
; range_low
++)
2056 int bit_index
= (unsigned) range_low
% TARGET_CHAR_BIT
;
2058 if (gdbarch_byte_order (exp
->gdbarch
) == BFD_ENDIAN_BIG
)
2059 bit_index
= TARGET_CHAR_BIT
- 1 - bit_index
;
2060 valaddr
[(unsigned) range_low
/ TARGET_CHAR_BIT
]
2067 argvec
= XALLOCAVEC (struct value
*, nargs
);
2068 for (tem
= 0; tem
< nargs
; tem
++)
2070 /* Ensure that array expressions are coerced into pointer
2072 argvec
[tem
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
2074 if (noside
== EVAL_SKIP
)
2075 return eval_skip_value (exp
);
2076 return value_array (tem2
, tem3
, argvec
);
2080 struct value
*array
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2081 struct value
*low
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2082 struct value
*upper
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2083 return eval_op_ternop (expect_type
, exp
, noside
, array
, low
, upper
);
2087 /* Skip third and second args to evaluate the first one. */
2088 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2089 if (value_logical_not (arg1
))
2091 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2092 return evaluate_subexp (nullptr, exp
, pos
, noside
);
2096 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2097 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2101 case OP_OBJC_SELECTOR
:
2102 { /* Objective C @selector operator. */
2103 char *sel
= &exp
->elts
[pc
+ 2].string
;
2104 int len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2106 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
2108 sel
[len
] = 0; /* Make sure it's terminated. */
2110 return eval_op_objc_selector (expect_type
, exp
, noside
, sel
);
2113 case OP_OBJC_MSGCALL
:
2114 { /* Objective C message (method) call. */
2116 CORE_ADDR responds_selector
= 0;
2117 CORE_ADDR method_selector
= 0;
2119 CORE_ADDR selector
= 0;
2121 int struct_return
= 0;
2122 enum noside sub_no_side
= EVAL_NORMAL
;
2124 struct value
*msg_send
= NULL
;
2125 struct value
*msg_send_stret
= NULL
;
2126 int gnu_runtime
= 0;
2128 struct value
*target
= NULL
;
2129 struct value
*method
= NULL
;
2130 struct value
*called_method
= NULL
;
2132 struct type
*selector_type
= NULL
;
2133 struct type
*long_type
;
2135 struct value
*ret
= NULL
;
2138 selector
= exp
->elts
[pc
+ 1].longconst
;
2139 nargs
= exp
->elts
[pc
+ 2].longconst
;
2140 argvec
= XALLOCAVEC (struct value
*, nargs
+ 5);
2144 long_type
= builtin_type (exp
->gdbarch
)->builtin_long
;
2145 selector_type
= builtin_type (exp
->gdbarch
)->builtin_data_ptr
;
2147 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2148 sub_no_side
= EVAL_NORMAL
;
2150 sub_no_side
= noside
;
2152 target
= evaluate_subexp (selector_type
, exp
, pos
, sub_no_side
);
2154 if (value_as_long (target
) == 0)
2155 return value_from_longest (long_type
, 0);
2157 if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0).minsym
)
2160 /* Find the method dispatch (Apple runtime) or method lookup
2161 (GNU runtime) function for Objective-C. These will be used
2162 to lookup the symbol information for the method. If we
2163 can't find any symbol information, then we'll use these to
2164 call the method, otherwise we can call the method
2165 directly. The msg_send_stret function is used in the special
2166 case of a method that returns a structure (Apple runtime
2170 type
= selector_type
;
2172 type
= lookup_function_type (type
);
2173 type
= lookup_pointer_type (type
);
2174 type
= lookup_function_type (type
);
2175 type
= lookup_pointer_type (type
);
2177 msg_send
= find_function_in_inferior ("objc_msg_lookup", NULL
);
2179 = find_function_in_inferior ("objc_msg_lookup", NULL
);
2181 msg_send
= value_from_pointer (type
, value_as_address (msg_send
));
2182 msg_send_stret
= value_from_pointer (type
,
2183 value_as_address (msg_send_stret
));
2187 msg_send
= find_function_in_inferior ("objc_msgSend", NULL
);
2188 /* Special dispatcher for methods returning structs. */
2190 = find_function_in_inferior ("objc_msgSend_stret", NULL
);
2193 /* Verify the target object responds to this method. The
2194 standard top-level 'Object' class uses a different name for
2195 the verification method than the non-standard, but more
2196 often used, 'NSObject' class. Make sure we check for both. */
2199 = lookup_child_selector (exp
->gdbarch
, "respondsToSelector:");
2200 if (responds_selector
== 0)
2202 = lookup_child_selector (exp
->gdbarch
, "respondsTo:");
2204 if (responds_selector
== 0)
2205 error (_("no 'respondsTo:' or 'respondsToSelector:' method"));
2208 = lookup_child_selector (exp
->gdbarch
, "methodForSelector:");
2209 if (method_selector
== 0)
2211 = lookup_child_selector (exp
->gdbarch
, "methodFor:");
2213 if (method_selector
== 0)
2214 error (_("no 'methodFor:' or 'methodForSelector:' method"));
2216 /* Call the verification method, to make sure that the target
2217 class implements the desired method. */
2219 argvec
[0] = msg_send
;
2221 argvec
[2] = value_from_longest (long_type
, responds_selector
);
2222 argvec
[3] = value_from_longest (long_type
, selector
);
2225 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2228 /* Function objc_msg_lookup returns a pointer. */
2230 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2232 if (value_as_long (ret
) == 0)
2233 error (_("Target does not respond to this message selector."));
2235 /* Call "methodForSelector:" method, to get the address of a
2236 function method that implements this selector for this
2237 class. If we can find a symbol at that address, then we
2238 know the return type, parameter types etc. (that's a good
2241 argvec
[0] = msg_send
;
2243 argvec
[2] = value_from_longest (long_type
, method_selector
);
2244 argvec
[3] = value_from_longest (long_type
, selector
);
2247 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2251 ret
= call_function_by_hand (argvec
[0], NULL
, {argvec
+ 1, 3});
2254 /* ret should now be the selector. */
2256 addr
= value_as_long (ret
);
2259 struct symbol
*sym
= NULL
;
2261 /* The address might point to a function descriptor;
2262 resolve it to the actual code address instead. */
2263 addr
= gdbarch_convert_from_func_ptr_addr (exp
->gdbarch
, addr
,
2264 current_top_target ());
2266 /* Is it a high_level symbol? */
2267 sym
= find_pc_function (addr
);
2269 method
= value_of_variable (sym
, 0);
2272 /* If we found a method with symbol information, check to see
2273 if it returns a struct. Otherwise assume it doesn't. */
2278 struct type
*val_type
;
2280 funaddr
= find_function_addr (method
, &val_type
);
2282 block_for_pc (funaddr
);
2284 val_type
= check_typedef (val_type
);
2286 if ((val_type
== NULL
)
2287 || (val_type
->code () == TYPE_CODE_ERROR
))
2289 if (expect_type
!= NULL
)
2290 val_type
= expect_type
;
2293 struct_return
= using_struct_return (exp
->gdbarch
, method
,
2296 else if (expect_type
!= NULL
)
2298 struct_return
= using_struct_return (exp
->gdbarch
, NULL
,
2299 check_typedef (expect_type
));
2302 /* Found a function symbol. Now we will substitute its
2303 value in place of the message dispatcher (obj_msgSend),
2304 so that we call the method directly instead of thru
2305 the dispatcher. The main reason for doing this is that
2306 we can now evaluate the return value and parameter values
2307 according to their known data types, in case we need to
2308 do things like promotion, dereferencing, special handling
2309 of structs and doubles, etc.
2311 We want to use the type signature of 'method', but still
2312 jump to objc_msgSend() or objc_msgSend_stret() to better
2313 mimic the behavior of the runtime. */
2317 if (value_type (method
)->code () != TYPE_CODE_FUNC
)
2318 error (_("method address has symbol information "
2319 "with non-function type; skipping"));
2321 /* Create a function pointer of the appropriate type, and
2322 replace its value with the value of msg_send or
2323 msg_send_stret. We must use a pointer here, as
2324 msg_send and msg_send_stret are of pointer type, and
2325 the representation may be different on systems that use
2326 function descriptors. */
2329 = value_from_pointer (lookup_pointer_type (value_type (method
)),
2330 value_as_address (msg_send_stret
));
2333 = value_from_pointer (lookup_pointer_type (value_type (method
)),
2334 value_as_address (msg_send
));
2339 called_method
= msg_send_stret
;
2341 called_method
= msg_send
;
2344 if (noside
== EVAL_SKIP
)
2345 return eval_skip_value (exp
);
2347 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2349 /* If the return type doesn't look like a function type,
2350 call an error. This can happen if somebody tries to
2351 turn a variable into a function call. This is here
2352 because people often want to call, eg, strcmp, which
2353 gdb doesn't know is a function. If gdb isn't asked for
2354 it's opinion (ie. through "whatis"), it won't offer
2357 struct type
*callee_type
= value_type (called_method
);
2359 if (callee_type
&& callee_type
->code () == TYPE_CODE_PTR
)
2360 callee_type
= TYPE_TARGET_TYPE (callee_type
);
2361 callee_type
= TYPE_TARGET_TYPE (callee_type
);
2365 if ((callee_type
->code () == TYPE_CODE_ERROR
) && expect_type
)
2366 return allocate_value (expect_type
);
2368 return allocate_value (callee_type
);
2371 error (_("Expression of type other than "
2372 "\"method returning ...\" used as a method"));
2375 /* Now depending on whether we found a symbol for the method,
2376 we will either call the runtime dispatcher or the method
2379 argvec
[0] = called_method
;
2381 argvec
[2] = value_from_longest (long_type
, selector
);
2382 /* User-supplied arguments. */
2383 for (tem
= 0; tem
< nargs
; tem
++)
2384 argvec
[tem
+ 3] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
2385 argvec
[tem
+ 3] = 0;
2387 auto call_args
= gdb::make_array_view (argvec
+ 1, nargs
+ 2);
2389 if (gnu_runtime
&& (method
!= NULL
))
2391 /* Function objc_msg_lookup returns a pointer. */
2392 deprecated_set_value_type (argvec
[0],
2393 lookup_pointer_type (lookup_function_type (value_type (argvec
[0]))));
2394 argvec
[0] = call_function_by_hand (argvec
[0], NULL
, call_args
);
2397 return call_function_by_hand (argvec
[0], NULL
, call_args
);
2402 return evaluate_funcall (expect_type
, exp
, pos
, noside
);
2405 /* We have a complex number, There should be 2 floating
2406 point numbers that compose it. */
2408 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2409 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2411 return value_literal_complex (arg1
, arg2
, exp
->elts
[pc
+ 1].type
);
2413 case STRUCTOP_STRUCT
:
2414 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2415 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
2416 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2417 return eval_op_structop_struct (expect_type
, exp
, noside
, arg1
,
2418 &exp
->elts
[pc
+ 2].string
);
2421 tem
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2422 (*pos
) += 3 + BYTES_TO_EXP_ELEM (tem
+ 1);
2423 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2424 return eval_op_structop_ptr (expect_type
, exp
, noside
, op
, arg1
,
2425 &exp
->elts
[pc
+ 2].string
);
2427 case STRUCTOP_MEMBER
:
2429 if (op
== STRUCTOP_MEMBER
)
2430 arg1
= evaluate_subexp_for_address (exp
, pos
, noside
);
2432 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2434 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2436 return eval_op_member (expect_type
, exp
, noside
, arg1
, arg2
);
2440 type_instance_flags flags
2441 = (type_instance_flag_value
) longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2442 nargs
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
2443 arg_types
= (struct type
**) alloca (nargs
* sizeof (struct type
*));
2444 for (ix
= 0; ix
< nargs
; ++ix
)
2445 arg_types
[ix
] = exp
->elts
[pc
+ 2 + ix
+ 1].type
;
2447 fake_method
fake_expect_type (flags
, nargs
, arg_types
);
2448 *(pos
) += 4 + nargs
;
2449 return evaluate_subexp_standard (fake_expect_type
.type (), exp
, pos
,
2454 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2455 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2456 return eval_op_concat (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2459 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2460 /* Special-case assignments where the left-hand-side is a
2461 convenience variable -- in these, don't bother setting an
2462 expected type. This avoids a weird case where re-assigning a
2463 string or array to an internal variable could error with "Too
2464 many array elements". */
2465 arg2
= evaluate_subexp (VALUE_LVAL (arg1
) == lval_internalvar
2467 : value_type (arg1
),
2470 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2472 if (binop_user_defined_p (op
, arg1
, arg2
))
2473 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2475 return value_assign (arg1
, arg2
);
2477 case BINOP_ASSIGN_MODIFY
:
2479 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2480 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2481 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2483 op
= exp
->elts
[pc
+ 1].opcode
;
2484 if (binop_user_defined_p (op
, arg1
, arg2
))
2485 return value_x_binop (arg1
, arg2
, BINOP_ASSIGN_MODIFY
, op
, noside
);
2486 else if (op
== BINOP_ADD
&& ptrmath_type_p (exp
->language_defn
,
2488 && is_integral_type (value_type (arg2
)))
2489 arg2
= value_ptradd (arg1
, value_as_long (arg2
));
2490 else if (op
== BINOP_SUB
&& ptrmath_type_p (exp
->language_defn
,
2492 && is_integral_type (value_type (arg2
)))
2493 arg2
= value_ptradd (arg1
, - value_as_long (arg2
));
2496 struct value
*tmp
= arg1
;
2498 /* For shift and integer exponentiation operations,
2499 only promote the first argument. */
2500 if ((op
== BINOP_LSH
|| op
== BINOP_RSH
|| op
== BINOP_EXP
)
2501 && is_integral_type (value_type (arg2
)))
2502 unop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
);
2504 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2506 arg2
= value_binop (tmp
, arg2
, op
);
2508 return value_assign (arg1
, arg2
);
2511 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2512 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2513 return eval_op_add (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2516 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2517 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2518 return eval_op_sub (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2528 case BINOP_BITWISE_AND
:
2529 case BINOP_BITWISE_IOR
:
2530 case BINOP_BITWISE_XOR
:
2531 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2532 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2533 return eval_op_binary (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2535 case BINOP_SUBSCRIPT
:
2536 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2537 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2538 return eval_op_subscript (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2540 case MULTI_SUBSCRIPT
:
2542 nargs
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
2543 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
2544 argvec
= XALLOCAVEC (struct value
*, nargs
);
2545 for (ix
= 0; ix
< nargs
; ++ix
)
2546 argvec
[ix
] = evaluate_subexp_with_coercion (exp
, pos
, noside
);
2547 if (noside
== EVAL_SKIP
)
2549 for (ix
= 0; ix
< nargs
; ++ix
)
2553 if (binop_user_defined_p (op
, arg1
, arg2
))
2555 arg1
= value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2559 arg1
= coerce_ref (arg1
);
2560 type
= check_typedef (value_type (arg1
));
2562 switch (type
->code ())
2565 case TYPE_CODE_ARRAY
:
2566 case TYPE_CODE_STRING
:
2567 arg1
= value_subscript (arg1
, value_as_long (arg2
));
2572 error (_("cannot subscript something of type `%s'"),
2575 error (_("cannot subscript requested type"));
2581 case BINOP_LOGICAL_AND
:
2582 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2583 if (noside
== EVAL_SKIP
)
2585 evaluate_subexp (nullptr, exp
, pos
, noside
);
2586 return eval_skip_value (exp
);
2590 arg2
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2593 if (binop_user_defined_p (op
, arg1
, arg2
))
2595 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2596 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2600 tem
= value_logical_not (arg1
);
2602 = evaluate_subexp (nullptr, exp
, pos
, (tem
? EVAL_SKIP
: noside
));
2603 type
= language_bool_type (exp
->language_defn
, exp
->gdbarch
);
2604 return value_from_longest (type
,
2605 (LONGEST
) (!tem
&& !value_logical_not (arg2
)));
2608 case BINOP_LOGICAL_OR
:
2609 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2610 if (noside
== EVAL_SKIP
)
2612 evaluate_subexp (nullptr, exp
, pos
, noside
);
2613 return eval_skip_value (exp
);
2617 arg2
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2620 if (binop_user_defined_p (op
, arg1
, arg2
))
2622 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2623 return value_x_binop (arg1
, arg2
, op
, OP_NULL
, noside
);
2627 tem
= value_logical_not (arg1
);
2629 = evaluate_subexp (nullptr, exp
, pos
, (!tem
? EVAL_SKIP
: noside
));
2630 type
= language_bool_type (exp
->language_defn
, exp
->gdbarch
);
2631 return value_from_longest (type
,
2632 (LONGEST
) (!tem
|| !value_logical_not (arg2
)));
2636 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2637 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2638 return eval_op_equal (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2640 case BINOP_NOTEQUAL
:
2641 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2642 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2643 return eval_op_notequal (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2646 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2647 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2648 return eval_op_less (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2651 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2652 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2653 return eval_op_gtr (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2656 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2657 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2658 return eval_op_geq (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2661 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2662 arg2
= evaluate_subexp (value_type (arg1
), exp
, pos
, noside
);
2663 return eval_op_leq (expect_type
, exp
, noside
, op
, arg1
, arg2
);
2666 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2667 arg2
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2668 return eval_op_repeat (expect_type
, exp
, noside
, arg1
, arg2
);
2671 evaluate_subexp (nullptr, exp
, pos
, noside
);
2672 return evaluate_subexp (nullptr, exp
, pos
, noside
);
2675 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2676 return eval_op_plus (expect_type
, exp
, noside
, op
, arg1
);
2679 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2680 return eval_op_neg (expect_type
, exp
, noside
, op
, arg1
);
2682 case UNOP_COMPLEMENT
:
2683 /* C++: check for and handle destructor names. */
2685 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2686 return eval_op_complement (expect_type
, exp
, noside
, op
, arg1
);
2688 case UNOP_LOGICAL_NOT
:
2689 arg1
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2690 return eval_op_lognot (expect_type
, exp
, noside
, op
, arg1
);
2693 if (expect_type
&& expect_type
->code () == TYPE_CODE_PTR
)
2694 expect_type
= TYPE_TARGET_TYPE (check_typedef (expect_type
));
2695 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2696 type
= check_typedef (value_type (arg1
));
2697 if (type
->code () == TYPE_CODE_METHODPTR
2698 || type
->code () == TYPE_CODE_MEMBERPTR
)
2699 error (_("Attempt to dereference pointer "
2700 "to member without an object"));
2701 if (noside
== EVAL_SKIP
)
2702 return eval_skip_value (exp
);
2703 if (unop_user_defined_p (op
, arg1
))
2704 return value_x_unop (arg1
, op
, noside
);
2705 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2707 type
= check_typedef (value_type (arg1
));
2709 /* If the type pointed to is dynamic then in order to resolve the
2710 dynamic properties we must actually dereference the pointer.
2711 There is a risk that this dereference will have side-effects
2712 in the inferior, but being able to print accurate type
2713 information seems worth the risk. */
2714 if ((type
->code () != TYPE_CODE_PTR
2715 && !TYPE_IS_REFERENCE (type
))
2716 || !is_dynamic_type (TYPE_TARGET_TYPE (type
)))
2718 if (type
->code () == TYPE_CODE_PTR
2719 || TYPE_IS_REFERENCE (type
)
2720 /* In C you can dereference an array to get the 1st elt. */
2721 || type
->code () == TYPE_CODE_ARRAY
)
2722 return value_zero (TYPE_TARGET_TYPE (type
),
2724 else if (type
->code () == TYPE_CODE_INT
)
2725 /* GDB allows dereferencing an int. */
2726 return value_zero (builtin_type (exp
->gdbarch
)->builtin_int
,
2729 error (_("Attempt to take contents of a non-pointer value."));
2733 /* Allow * on an integer so we can cast it to whatever we want.
2734 This returns an int, which seems like the most C-like thing to
2735 do. "long long" variables are rare enough that
2736 BUILTIN_TYPE_LONGEST would seem to be a mistake. */
2737 if (type
->code () == TYPE_CODE_INT
)
2738 return value_at_lazy (builtin_type (exp
->gdbarch
)->builtin_int
,
2739 (CORE_ADDR
) value_as_address (arg1
));
2740 return value_ind (arg1
);
2743 /* C++: check for and handle pointer to members. */
2745 if (noside
== EVAL_SKIP
)
2747 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2748 return eval_skip_value (exp
);
2751 return evaluate_subexp_for_address (exp
, pos
, noside
);
2754 if (noside
== EVAL_SKIP
)
2756 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2757 return eval_skip_value (exp
);
2759 return evaluate_subexp_for_sizeof (exp
, pos
, noside
);
2764 evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
));
2765 /* FIXME: This should be size_t. */
2766 struct type
*size_type
= builtin_type (exp
->gdbarch
)->builtin_int
;
2767 ULONGEST align
= type_align (type
);
2769 error (_("could not determine alignment of type"));
2770 return value_from_longest (size_type
, align
);
2775 type
= exp
->elts
[pc
+ 1].type
;
2776 return evaluate_subexp_for_cast (exp
, pos
, noside
, type
);
2778 case UNOP_CAST_TYPE
:
2779 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2780 type
= value_type (arg1
);
2781 return evaluate_subexp_for_cast (exp
, pos
, noside
, type
);
2783 case UNOP_DYNAMIC_CAST
:
2784 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2785 type
= value_type (arg1
);
2786 arg1
= evaluate_subexp (type
, exp
, pos
, noside
);
2787 if (noside
== EVAL_SKIP
)
2788 return eval_skip_value (exp
);
2789 return value_dynamic_cast (type
, arg1
);
2791 case UNOP_REINTERPRET_CAST
:
2792 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2793 type
= value_type (arg1
);
2794 arg1
= evaluate_subexp (type
, exp
, pos
, noside
);
2795 if (noside
== EVAL_SKIP
)
2796 return eval_skip_value (exp
);
2797 return value_reinterpret_cast (type
, arg1
);
2801 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2802 if (noside
== EVAL_SKIP
)
2803 return eval_skip_value (exp
);
2804 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2805 return value_zero (exp
->elts
[pc
+ 1].type
, lval_memory
);
2807 return value_at_lazy (exp
->elts
[pc
+ 1].type
,
2808 value_as_address (arg1
));
2810 case UNOP_MEMVAL_TYPE
:
2811 arg1
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2812 type
= value_type (arg1
);
2813 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2814 if (noside
== EVAL_SKIP
)
2815 return eval_skip_value (exp
);
2816 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2817 return value_zero (type
, lval_memory
);
2819 return value_at_lazy (type
, value_as_address (arg1
));
2821 case UNOP_PREINCREMENT
:
2822 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2823 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2825 else if (unop_user_defined_p (op
, arg1
))
2827 return value_x_unop (arg1
, op
, noside
);
2831 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2832 arg2
= value_ptradd (arg1
, 1);
2835 struct value
*tmp
= arg1
;
2837 arg2
= value_one (value_type (arg1
));
2838 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2839 arg2
= value_binop (tmp
, arg2
, BINOP_ADD
);
2842 return value_assign (arg1
, arg2
);
2845 case UNOP_PREDECREMENT
:
2846 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2847 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2849 else if (unop_user_defined_p (op
, arg1
))
2851 return value_x_unop (arg1
, op
, noside
);
2855 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2856 arg2
= value_ptradd (arg1
, -1);
2859 struct value
*tmp
= arg1
;
2861 arg2
= value_one (value_type (arg1
));
2862 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2863 arg2
= value_binop (tmp
, arg2
, BINOP_SUB
);
2866 return value_assign (arg1
, arg2
);
2869 case UNOP_POSTINCREMENT
:
2870 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2871 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2873 else if (unop_user_defined_p (op
, arg1
))
2875 return value_x_unop (arg1
, op
, noside
);
2879 arg3
= value_non_lval (arg1
);
2881 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2882 arg2
= value_ptradd (arg1
, 1);
2885 struct value
*tmp
= arg1
;
2887 arg2
= value_one (value_type (arg1
));
2888 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2889 arg2
= value_binop (tmp
, arg2
, BINOP_ADD
);
2892 value_assign (arg1
, arg2
);
2896 case UNOP_POSTDECREMENT
:
2897 arg1
= evaluate_subexp (expect_type
, exp
, pos
, noside
);
2898 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
2900 else if (unop_user_defined_p (op
, arg1
))
2902 return value_x_unop (arg1
, op
, noside
);
2906 arg3
= value_non_lval (arg1
);
2908 if (ptrmath_type_p (exp
->language_defn
, value_type (arg1
)))
2909 arg2
= value_ptradd (arg1
, -1);
2912 struct value
*tmp
= arg1
;
2914 arg2
= value_one (value_type (arg1
));
2915 binop_promote (exp
->language_defn
, exp
->gdbarch
, &tmp
, &arg2
);
2916 arg2
= value_binop (tmp
, arg2
, BINOP_SUB
);
2919 value_assign (arg1
, arg2
);
2925 return value_of_this (exp
->language_defn
);
2928 /* The value is not supposed to be used. This is here to make it
2929 easier to accommodate expressions that contain types. */
2931 if (noside
== EVAL_SKIP
)
2932 return eval_skip_value (exp
);
2933 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2934 return allocate_value (exp
->elts
[pc
+ 1].type
);
2936 error (_("Attempt to use a type name as an expression"));
2940 if (noside
== EVAL_SKIP
)
2942 evaluate_subexp (nullptr, exp
, pos
, EVAL_SKIP
);
2943 return eval_skip_value (exp
);
2945 else if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
2947 enum exp_opcode sub_op
= exp
->elts
[*pos
].opcode
;
2948 struct value
*result
;
2950 result
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2952 /* 'decltype' has special semantics for lvalues. */
2953 if (op
== OP_DECLTYPE
2954 && (sub_op
== BINOP_SUBSCRIPT
2955 || sub_op
== STRUCTOP_MEMBER
2956 || sub_op
== STRUCTOP_MPTR
2957 || sub_op
== UNOP_IND
2958 || sub_op
== STRUCTOP_STRUCT
2959 || sub_op
== STRUCTOP_PTR
2960 || sub_op
== OP_SCOPE
))
2962 type
= value_type (result
);
2964 if (!TYPE_IS_REFERENCE (type
))
2966 type
= lookup_lvalue_reference_type (type
);
2967 result
= allocate_value (type
);
2974 error (_("Attempt to use a type as an expression"));
2978 struct value
*result
;
2979 enum exp_opcode sub_op
= exp
->elts
[*pos
].opcode
;
2981 if (sub_op
== OP_TYPE
|| sub_op
== OP_DECLTYPE
|| sub_op
== OP_TYPEOF
)
2982 result
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
2984 result
= evaluate_subexp (nullptr, exp
, pos
, noside
);
2986 if (noside
!= EVAL_NORMAL
)
2987 return allocate_value (cplus_typeid_type (exp
->gdbarch
));
2989 return cplus_typeid (result
);
2993 /* Removing this case and compiling with gcc -Wall reveals that
2994 a lot of cases are hitting this case. Some of these should
2995 probably be removed from expression.h; others are legitimate
2996 expressions which are (apparently) not fully implemented.
2998 If there are any cases landing here which mean a user error,
2999 then they should be separate cases, with more descriptive
3002 error (_("GDB does not (yet) know how to "
3003 "evaluate that kind of expression"));
3006 gdb_assert_not_reached ("missed return?");
3009 /* Evaluate a subexpression of EXP, at index *POS,
3010 and return the address of that subexpression.
3011 Advance *POS over the subexpression.
3012 If the subexpression isn't an lvalue, get an error.
3013 NOSIDE may be EVAL_AVOID_SIDE_EFFECTS;
3014 then only the type of the result need be correct. */
3016 static struct value
*
3017 evaluate_subexp_for_address (struct expression
*exp
, int *pos
,
3027 op
= exp
->elts
[pc
].opcode
;
3033 x
= evaluate_subexp (nullptr, exp
, pos
, noside
);
3035 /* We can't optimize out "&*" if there's a user-defined operator*. */
3036 if (unop_user_defined_p (op
, x
))
3038 x
= value_x_unop (x
, op
, noside
);
3039 goto default_case_after_eval
;
3042 return coerce_array (x
);
3046 return value_cast (lookup_pointer_type (exp
->elts
[pc
+ 1].type
),
3047 evaluate_subexp (nullptr, exp
, pos
, noside
));
3049 case UNOP_MEMVAL_TYPE
:
3054 x
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3055 type
= value_type (x
);
3056 return value_cast (lookup_pointer_type (type
),
3057 evaluate_subexp (nullptr, exp
, pos
, noside
));
3061 var
= exp
->elts
[pc
+ 2].symbol
;
3063 /* C++: The "address" of a reference should yield the address
3064 * of the object pointed to. Let value_addr() deal with it. */
3065 if (TYPE_IS_REFERENCE (SYMBOL_TYPE (var
)))
3069 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3072 lookup_pointer_type (SYMBOL_TYPE (var
));
3073 enum address_class sym_class
= SYMBOL_CLASS (var
);
3075 if (sym_class
== LOC_CONST
3076 || sym_class
== LOC_CONST_BYTES
3077 || sym_class
== LOC_REGISTER
)
3078 error (_("Attempt to take address of register or constant."));
3081 value_zero (type
, not_lval
);
3084 return address_of_variable (var
, exp
->elts
[pc
+ 1].block
);
3086 case OP_VAR_MSYM_VALUE
:
3090 value
*val
= evaluate_var_msym_value (noside
,
3091 exp
->elts
[pc
+ 1].objfile
,
3092 exp
->elts
[pc
+ 2].msymbol
);
3093 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3095 struct type
*type
= lookup_pointer_type (value_type (val
));
3096 return value_zero (type
, not_lval
);
3099 return value_addr (val
);
3103 tem
= longest_to_int (exp
->elts
[pc
+ 2].longconst
);
3104 (*pos
) += 5 + BYTES_TO_EXP_ELEM (tem
+ 1);
3105 x
= value_aggregate_elt (exp
->elts
[pc
+ 1].type
,
3106 &exp
->elts
[pc
+ 3].string
,
3109 error (_("There is no field named %s"), &exp
->elts
[pc
+ 3].string
);
3114 x
= evaluate_subexp (nullptr, exp
, pos
, noside
);
3115 default_case_after_eval
:
3116 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3118 struct type
*type
= check_typedef (value_type (x
));
3120 if (TYPE_IS_REFERENCE (type
))
3121 return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
3123 else if (VALUE_LVAL (x
) == lval_memory
|| value_must_coerce_to_target (x
))
3124 return value_zero (lookup_pointer_type (value_type (x
)),
3127 error (_("Attempt to take address of "
3128 "value not located in memory."));
3130 return value_addr (x
);
3134 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
3135 When used in contexts where arrays will be coerced anyway, this is
3136 equivalent to `evaluate_subexp' but much faster because it avoids
3137 actually fetching array contents (perhaps obsolete now that we have
3140 Note that we currently only do the coercion for C expressions, where
3141 arrays are zero based and the coercion is correct. For other languages,
3142 with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION
3143 to decide if coercion is appropriate. */
3146 evaluate_subexp_with_coercion (struct expression
*exp
,
3147 int *pos
, enum noside noside
)
3156 op
= exp
->elts
[pc
].opcode
;
3161 var
= exp
->elts
[pc
+ 2].symbol
;
3162 type
= check_typedef (SYMBOL_TYPE (var
));
3163 if (type
->code () == TYPE_CODE_ARRAY
3164 && !type
->is_vector ()
3165 && CAST_IS_CONVERSION (exp
->language_defn
))
3168 val
= address_of_variable (var
, exp
->elts
[pc
+ 1].block
);
3169 return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (type
)),
3175 return evaluate_subexp (nullptr, exp
, pos
, noside
);
3179 /* Evaluate a subexpression of EXP, at index *POS,
3180 and return a value for the size of that subexpression.
3181 Advance *POS over the subexpression. If NOSIDE is EVAL_NORMAL
3182 we allow side-effects on the operand if its type is a variable
3185 static struct value
*
3186 evaluate_subexp_for_sizeof (struct expression
*exp
, int *pos
,
3189 /* FIXME: This should be size_t. */
3190 struct type
*size_type
= builtin_type (exp
->gdbarch
)->builtin_int
;
3197 op
= exp
->elts
[pc
].opcode
;
3201 /* This case is handled specially
3202 so that we avoid creating a value for the result type.
3203 If the result type is very big, it's desirable not to
3204 create a value unnecessarily. */
3207 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3208 type
= check_typedef (value_type (val
));
3209 if (type
->code () != TYPE_CODE_PTR
3210 && !TYPE_IS_REFERENCE (type
)
3211 && type
->code () != TYPE_CODE_ARRAY
)
3212 error (_("Attempt to take contents of a non-pointer value."));
3213 type
= TYPE_TARGET_TYPE (type
);
3214 if (is_dynamic_type (type
))
3215 type
= value_type (value_ind (val
));
3216 return value_from_longest (size_type
, (LONGEST
) TYPE_LENGTH (type
));
3220 type
= exp
->elts
[pc
+ 1].type
;
3223 case UNOP_MEMVAL_TYPE
:
3225 val
= evaluate_subexp (NULL
, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3226 type
= value_type (val
);
3230 type
= SYMBOL_TYPE (exp
->elts
[pc
+ 2].symbol
);
3231 if (is_dynamic_type (type
))
3233 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_NORMAL
);
3234 type
= value_type (val
);
3235 if (type
->code () == TYPE_CODE_ARRAY
)
3237 if (type_not_allocated (type
) || type_not_associated (type
))
3238 return value_zero (size_type
, not_lval
);
3239 else if (is_dynamic_type (type
->index_type ())
3240 && type
->bounds ()->high
.kind () == PROP_UNDEFINED
)
3241 return allocate_optimized_out_value (size_type
);
3248 case OP_VAR_MSYM_VALUE
:
3252 minimal_symbol
*msymbol
= exp
->elts
[pc
+ 2].msymbol
;
3253 value
*mval
= evaluate_var_msym_value (noside
,
3254 exp
->elts
[pc
+ 1].objfile
,
3257 type
= value_type (mval
);
3258 if (type
->code () == TYPE_CODE_ERROR
)
3259 error_unknown_type (msymbol
->print_name ());
3261 return value_from_longest (size_type
, TYPE_LENGTH (type
));
3265 /* Deal with the special case if NOSIDE is EVAL_NORMAL and the resulting
3266 type of the subscript is a variable length array type. In this case we
3267 must re-evaluate the right hand side of the subscription to allow
3269 case BINOP_SUBSCRIPT
:
3270 if (noside
== EVAL_NORMAL
)
3272 int npc
= (*pos
) + 1;
3274 val
= evaluate_subexp (nullptr, exp
, &npc
, EVAL_AVOID_SIDE_EFFECTS
);
3275 type
= check_typedef (value_type (val
));
3276 if (type
->code () == TYPE_CODE_ARRAY
)
3278 type
= check_typedef (TYPE_TARGET_TYPE (type
));
3279 if (type
->code () == TYPE_CODE_ARRAY
)
3281 type
= type
->index_type ();
3282 /* Only re-evaluate the right hand side if the resulting type
3283 is a variable length type. */
3284 if (type
->bounds ()->flag_bound_evaluated
)
3286 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_NORMAL
);
3287 return value_from_longest
3288 (size_type
, (LONGEST
) TYPE_LENGTH (value_type (val
)));
3297 val
= evaluate_subexp (nullptr, exp
, pos
, EVAL_AVOID_SIDE_EFFECTS
);
3298 type
= value_type (val
);
3302 /* $5.3.3/2 of the C++ Standard (n3290 draft) says of sizeof:
3303 "When applied to a reference or a reference type, the result is
3304 the size of the referenced type." */
3305 type
= check_typedef (type
);
3306 if (exp
->language_defn
->la_language
== language_cplus
3307 && (TYPE_IS_REFERENCE (type
)))
3308 type
= check_typedef (TYPE_TARGET_TYPE (type
));
3309 return value_from_longest (size_type
, (LONGEST
) TYPE_LENGTH (type
));
3312 /* Evaluate a subexpression of EXP, at index *POS, and return a value
3313 for that subexpression cast to TO_TYPE. Advance *POS over the
3317 evaluate_subexp_for_cast (expression
*exp
, int *pos
,
3319 struct type
*to_type
)
3323 /* Don't let symbols be evaluated with evaluate_subexp because that
3324 throws an "unknown type" error for no-debug data symbols.
3325 Instead, we want the cast to reinterpret the symbol. */
3326 if (exp
->elts
[pc
].opcode
== OP_VAR_MSYM_VALUE
3327 || exp
->elts
[pc
].opcode
== OP_VAR_VALUE
)
3332 if (exp
->elts
[pc
].opcode
== OP_VAR_MSYM_VALUE
)
3334 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
3335 return value_zero (to_type
, not_lval
);
3337 val
= evaluate_var_msym_value (noside
,
3338 exp
->elts
[pc
+ 1].objfile
,
3339 exp
->elts
[pc
+ 2].msymbol
);
3342 val
= evaluate_var_value (noside
,
3343 exp
->elts
[pc
+ 1].block
,
3344 exp
->elts
[pc
+ 2].symbol
);
3346 if (noside
== EVAL_SKIP
)
3347 return eval_skip_value (exp
);
3349 val
= value_cast (to_type
, val
);
3351 /* Don't allow e.g. '&(int)var_with_no_debug_info'. */
3352 if (VALUE_LVAL (val
) == lval_memory
)
3354 if (value_lazy (val
))
3355 value_fetch_lazy (val
);
3356 VALUE_LVAL (val
) = not_lval
;
3361 value
*val
= evaluate_subexp (to_type
, exp
, pos
, noside
);
3362 if (noside
== EVAL_SKIP
)
3363 return eval_skip_value (exp
);
3364 return value_cast (to_type
, val
);
3367 /* Parse a type expression in the string [P..P+LENGTH). */
3370 parse_and_eval_type (const char *p
, int length
)
3372 char *tmp
= (char *) alloca (length
+ 4);
3375 memcpy (tmp
+ 1, p
, length
);
3376 tmp
[length
+ 1] = ')';
3377 tmp
[length
+ 2] = '0';
3378 tmp
[length
+ 3] = '\0';
3379 expression_up expr
= parse_expression (tmp
);
3380 if (expr
->first_opcode () != UNOP_CAST
)
3381 error (_("Internal error in eval_type."));
3382 return expr
->elts
[1].type
;