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Implement UNOP_MEMVAL and UNOP_MEMVAL_TYPE

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This adds class unop_memval_operation and unop_memval_type_operation,
which implement UNOP_MEMVAL and UNOP_MEMVAL_TYPE.

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

	* expop.h (class unop_memval_operation)
	(class unop_memval_type_operation): New.
	* eval.c (eval_op_memval): No longer static.
	(unop_memval_operation::evaluate_for_address)
	(unop_memval_type_operation::evaluate_for_address)
	(unop_memval_operation::evaluate_for_sizeof)
	(unop_memval_type_operation::evaluate_for_sizeof): New methods.
	* ax-gdb.c (unop_memval_operation::do_generate_ax)
	(unop_memval_type_operation::do_generate_ax): New methods.
This commit is contained in:
Tom Tromey
2021-03-08 07:27:57 -07:00
parent ae4bb61e19
commit cbc18219d3
4 changed files with 165 additions and 1 deletions
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37
gdb/eval.c
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@ -1897,7 +1897,7 @@ eval_op_alignof (struct type *expect_type, struct expression *exp,
/* A helper function for UNOP_MEMVAL. */
static struct value *
struct value *
eval_op_memval (struct type *expect_type, struct expression *exp,
enum noside noside,
struct value *arg1, struct type *type)
@ -3333,6 +3333,25 @@ var_msym_value_operation::evaluate_for_address (struct expression *exp,
return value_addr (val);
}
value *
unop_memval_operation::evaluate_for_address (struct expression *exp,
enum noside noside)
{
return value_cast (lookup_pointer_type (std::get<1> (m_storage)),
std::get<0> (m_storage)->evaluate (nullptr, exp, noside));
}
value *
unop_memval_type_operation::evaluate_for_address (struct expression *exp,
enum noside noside)
{
value *typeval = std::get<0> (m_storage)->evaluate (nullptr, exp,
EVAL_AVOID_SIDE_EFFECTS);
struct type *type = value_type (typeval);
return value_cast (lookup_pointer_type (type),
std::get<1> (m_storage)->evaluate (nullptr, exp, noside));
}
}
/* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
@ -3604,6 +3623,22 @@ unop_ind_base_operation::evaluate_for_sizeof (struct expression *exp,
return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
}
value *
unop_memval_operation::evaluate_for_sizeof (struct expression *exp,
enum noside noside)
{
return evaluate_subexp_for_sizeof_base (exp, std::get<1> (m_storage));
}
value *
unop_memval_type_operation::evaluate_for_sizeof (struct expression *exp,
enum noside noside)
{
value *typeval = std::get<0> (m_storage)->evaluate (nullptr, exp,
EVAL_AVOID_SIDE_EFFECTS);
return evaluate_subexp_for_sizeof_base (exp, value_type (typeval));
}
}
/* Evaluate a subexpression of EXP, at index *POS, and return a value