[PATCH 111/203] Introduce unop_addr_operation

Tom Tromey
2021-01-01T21:48:46Z

This adds class unop_addr_operation, which implements UNOP_ADDR.

gdb/ChangeLog
2021-01-01 Tom Tromey <tom@tromey.com>

* expop.h (class unop_addr_operation): New.
* ax-gdb.c (gen_expr_unop) <case UNOP_ADDR>: New.
---
gdb/ChangeLog | 5 +++++
gdb/ax-gdb.c | 5 +++++
gdb/expop.h | 36 ++++++++++++++++++++++++++++++++++++
3 files changed, 46 insertions(+)

diff --git a/gdb/ax-gdb.c b/gdb/ax-gdb.c
index f7ab50f8cde..64710887534 100644
--- a/gdb/ax-gdb.c
+++ b/gdb/ax-gdb.c
@@ -2744,6 +2744,11 @@ gen_expr_unop (struct expression *exp,
gen_deref (value);
break;

+ case UNOP_ADDR:
+ lhs->generate_ax (exp, ax, value);
+ gen_address_of (value);
+ break;
+
default:
gdb_assert_not_reached ("invalid case in gen_expr_unop");
}
diff --git a/gdb/expop.h b/gdb/expop.h
index 9f23b8afd7c..8ddc26d329a 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -1535,6 +1535,42 @@ class typeid_operation
{ return OP_TYPEID; }
};

+/* Implement the address-of operation. */
+class unop_addr_operation
+ : public maybe_constant_operation<operation_up>
+{
+public:
+
+ using maybe_constant_operation::maybe_constant_operation;
+
+ value *evaluate (struct type *expect_type,
+ struct expression *exp,
+ enum noside noside) override
+ {
+ /* C++: check for and handle pointer to members. */
+ if (noside == EVAL_SKIP)
+ return eval_skip_value (exp);
+ else
+ return std::get<0> (m_storage)->evaluate_for_address (exp, noside);
+ }
+
+ enum exp_opcode opcode () const override
+ { return UNOP_ADDR; }
+
+protected:
+
+ void do_generate_ax (struct expression *exp,
+ struct agent_expr *ax,
+ struct axs_value *value,
+ struct type *cast_type)
+ override
+ {
+ gen_expr_unop (exp, UNOP_ADDR,
+ std::get<0> (this->m_storage).get (),
+ ax, value);
+ }
+};
+
} /* namespace expr */

#endif /* EXPOP_H */
--
2.26.2