[PATCH 108/203] Introduce typeof_operation

Tom Tromey
2021-01-01T21:48:45Z

This adds class typeof_operation, which implements OP_TYPEOF.

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

* expop.h (class typeof_operation): New.
---
gdb/ChangeLog | 4 ++++
gdb/expop.h | 25 +++++++++++++++++++++++++
2 files changed, 29 insertions(+)

diff --git a/gdb/expop.h b/gdb/expop.h
index aac3e729de9..502ad71d067 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -1434,6 +1434,31 @@ class type_operation
{ return true; }
};

+/* Implement the "typeof" operation. */
+class typeof_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
+ {
+ if (noside == EVAL_SKIP)
+ return eval_skip_value (exp);
+ else if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ return std::get<0> (m_storage)->evaluate (nullptr, exp,
+ EVAL_AVOID_SIDE_EFFECTS);
+ else
+ error (_("Attempt to use a type as an expression"));
+ }
+
+ enum exp_opcode opcode () const override
+ { return OP_TYPEOF; }
+};
+
} /* namespace expr */

#endif /* EXPOP_H */
--
2.26.2