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Split helper functions

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This splits a couple of address-of and sizeof functions, so that the
body can be reused by the (coming) new expression code.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

	* eval.c (evaluate_subexp_for_address_base): New function.
	(evaluate_subexp_for_address): Use it.
	(evaluate_subexp_for_sizeof_base): New function.
	(evaluate_subexp_for_sizeof): Use it.
This commit is contained in:
Tom Tromey
2021-03-08 07:27:57 -07:00
parent 1fa41fc710
commit 13ea014aee
2 changed files with 49 additions and 23 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2021-03-08 Tom Tromey <tom@tromey.com>
* eval.c (evaluate_subexp_for_address_base): New function.
(evaluate_subexp_for_address): Use it.
(evaluate_subexp_for_sizeof_base): New function.
(evaluate_subexp_for_sizeof): Use it.
2021-03-08 Tom Tromey <tom@tromey.com> 2021-03-08 Tom Tromey <tom@tromey.com>
* rust-lang.c (eval_op_rust_structop): New function. * rust-lang.c (eval_op_rust_structop): New function.

65
gdb/eval.c
View File

@ -3081,6 +3081,29 @@ evaluate_subexp_standard (struct type *expect_type,
gdb_assert_not_reached ("missed return?"); gdb_assert_not_reached ("missed return?");
} }
/* Helper for evaluate_subexp_for_address. */
static value *
evaluate_subexp_for_address_base (struct expression *exp, enum noside noside,
value *x)
{
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
struct type *type = check_typedef (value_type (x));
if (TYPE_IS_REFERENCE (type))
return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
not_lval);
else if (VALUE_LVAL (x) == lval_memory || value_must_coerce_to_target (x))
return value_zero (lookup_pointer_type (value_type (x)),
not_lval);
else
error (_("Attempt to take address of "
"value not located in memory."));
}
return value_addr (x);
}
/* Evaluate a subexpression of EXP, at index *POS, /* Evaluate a subexpression of EXP, at index *POS,
and return the address of that subexpression. and return the address of that subexpression.
Advance *POS over the subexpression. Advance *POS over the subexpression.
@ -3188,21 +3211,7 @@ evaluate_subexp_for_address (struct expression *exp, int *pos,
default_case: default_case:
x = evaluate_subexp (nullptr, exp, pos, noside); x = evaluate_subexp (nullptr, exp, pos, noside);
default_case_after_eval: default_case_after_eval:
if (noside == EVAL_AVOID_SIDE_EFFECTS) return evaluate_subexp_for_address_base (exp, noside, x);
{
struct type *type = check_typedef (value_type (x));
if (TYPE_IS_REFERENCE (type))
return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type)),
not_lval);
else if (VALUE_LVAL (x) == lval_memory || value_must_coerce_to_target (x))
return value_zero (lookup_pointer_type (value_type (x)),
not_lval);
else
error (_("Attempt to take address of "
"value not located in memory."));
}
return value_addr (x);
} }
} }
@ -3251,6 +3260,23 @@ evaluate_subexp_with_coercion (struct expression *exp,
} }
} }
/* Helper function for evaluating the size of a type. */
static value *
evaluate_subexp_for_sizeof_base (struct expression *exp, struct type *type)
{
/* FIXME: This should be size_t. */
struct type *size_type = builtin_type (exp->gdbarch)->builtin_int;
/* $5.3.3/2 of the C++ Standard (n3290 draft) says of sizeof:
"When applied to a reference or a reference type, the result is
the size of the referenced type." */
type = check_typedef (type);
if (exp->language_defn->la_language == language_cplus
&& (TYPE_IS_REFERENCE (type)))
type = check_typedef (TYPE_TARGET_TYPE (type));
return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
}
/* Evaluate a subexpression of EXP, at index *POS, /* Evaluate a subexpression of EXP, at index *POS,
and return a value for the size of that subexpression. and return a value for the size of that subexpression.
Advance *POS over the subexpression. If NOSIDE is EVAL_NORMAL Advance *POS over the subexpression. If NOSIDE is EVAL_NORMAL
@ -3374,14 +3400,7 @@ evaluate_subexp_for_sizeof (struct expression *exp, int *pos,
break; break;
} }
/* $5.3.3/2 of the C++ Standard (n3290 draft) says of sizeof: return evaluate_subexp_for_sizeof_base (exp, type);
"When applied to a reference or a reference type, the result is
the size of the referenced type." */
type = check_typedef (type);
if (exp->language_defn->la_language == language_cplus
&& (TYPE_IS_REFERENCE (type)))
type = check_typedef (TYPE_TARGET_TYPE (type));
return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
} }
/* Evaluate a subexpression of EXP, at index *POS, and return a value /* Evaluate a subexpression of EXP, at index *POS, and return a value