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Split out eval_op_m2_subscript

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This splits BINOP_SUBSCRIPT into a new function for future use.

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

	* m2-lang.c (eval_op_m2_subscript): New function.
	(evaluate_subexp_modula2): Use it.
This commit is contained in:
Tom Tromey 2021-03-08 07:27:57 -07:00
parent 41bdced5ae
commit a49881f73e
2 changed files with 56 additions and 48 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2021-03-08 Tom Tromey <tom@tromey.com>
* m2-lang.c (eval_op_m2_subscript): New function.
(evaluate_subexp_modula2): Use it.
2021-03-08 Tom Tromey <tom@tromey.com>
* m2-lang.c (eval_op_m2_high): New function.

99
gdb/m2-lang.c
View File

@ -60,6 +60,56 @@ eval_op_m2_high (struct type *expect_type, struct expression *exp,
return arg1;
}
/* A helper function for BINOP_SUBSCRIPT. */
static struct value *
eval_op_m2_subscript (struct type *expect_type, struct expression *exp,
enum noside noside,
struct value *arg1, struct value *arg2)
{
if (noside == EVAL_SKIP)
return eval_skip_value (exp);
/* If the user attempts to subscript something that is not an
array or pointer type (like a plain int variable for example),
then report this as an error. */
arg1 = coerce_ref (arg1);
struct type *type = check_typedef (value_type (arg1));
if (m2_is_unbounded_array (type))
{
struct value *temp = arg1;
type = type->field (0).type ();
if (type == NULL || (type->code () != TYPE_CODE_PTR))
error (_("internal error: unbounded "
"array structure is unknown"));
/* i18n: Do not translate the "_m2_contents" part! */
arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
_("unbounded structure "
"missing _m2_contents field"));
if (value_type (arg1) != type)
arg1 = value_cast (type, arg1);
check_typedef (value_type (arg1));
return value_ind (value_ptradd (arg1, value_as_long (arg2)));
}
else
if (type->code () != TYPE_CODE_ARRAY)
{
if (type->name ())
error (_("cannot subscript something of type `%s'"),
type->name ());
else
error (_("cannot subscript requested type"));
}
if (noside == EVAL_AVOID_SIDE_EFFECTS)
return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
else
return value_subscript (arg1, value_as_long (arg2));
}
static struct value *
evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
int *pos, enum noside noside)
@ -67,7 +117,6 @@ evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
enum exp_opcode op = exp->elts[*pos].opcode;
struct value *arg1;
struct value *arg2;
struct type *type;
switch (op)
{
@ -80,57 +129,11 @@ evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
(*pos)++;
arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
if (noside == EVAL_SKIP)
goto nosideret;
/* If the user attempts to subscript something that is not an
array or pointer type (like a plain int variable for example),
then report this as an error. */
arg1 = coerce_ref (arg1);
type = check_typedef (value_type (arg1));
if (m2_is_unbounded_array (type))
{
struct value *temp = arg1;
type = type->field (0).type ();
if (type == NULL || (type->code () != TYPE_CODE_PTR))
{
warning (_("internal error: unbounded "
"array structure is unknown"));
return evaluate_subexp_standard (expect_type, exp, pos, noside);
}
/* i18n: Do not translate the "_m2_contents" part! */
arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
_("unbounded structure "
"missing _m2_contents field"));
if (value_type (arg1) != type)
arg1 = value_cast (type, arg1);
check_typedef (value_type (arg1));
return value_ind (value_ptradd (arg1, value_as_long (arg2)));
}
else
if (type->code () != TYPE_CODE_ARRAY)
{
if (type->name ())
error (_("cannot subscript something of type `%s'"),
type->name ());
else
error (_("cannot subscript requested type"));
}
if (noside == EVAL_AVOID_SIDE_EFFECTS)
return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
else
return value_subscript (arg1, value_as_long (arg2));
return eval_op_m2_subscript (expect_type, exp, noside, arg1, arg2);
default:
return evaluate_subexp_standard (expect_type, exp, pos, noside);
}
nosideret:
return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
}