[PATCH 078/203] Introduce long_const_operation

Tom Tromey
2021-01-01T21:48:18Z

This adds class long_const_operation, which holds a scalar constant.

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

* expop.h (class long_const_operation): New.
* ax-gdb.c (long_const_operation::do_generate_ax): New method.
---
gdb/ChangeLog | 5 +++++
gdb/ax-gdb.c | 10 ++++++++++
gdb/expop.h | 30 ++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+)

diff --git a/gdb/ax-gdb.c b/gdb/ax-gdb.c
index 6d568a71e03..7640b1ba925 100644
--- a/gdb/ax-gdb.c
+++ b/gdb/ax-gdb.c
@@ -2314,6 +2314,16 @@ scope_operation::do_generate_ax (struct expression *exp,
error (_("There is no field named %s"), name.c_str ());
}

+void
+long_const_operation::do_generate_ax (struct expression *exp,
+ struct agent_expr *ax,
+ struct axs_value *value,
+ struct type *cast_type)
+{
+ gen_int_literal (ax, value, std::get<1> (m_storage),
+ std::get<0> (m_storage));
+}
+
}

/* This handles the middle-to-right-side of code generation for binary
diff --git a/gdb/expop.h b/gdb/expop.h
index 3fcd25ddcea..ede075b44d8 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -449,6 +449,36 @@ class scope_operation
override;
};

+class long_const_operation
+ : public tuple_holding_operation<struct type *, LONGEST>
+{
+public:
+
+ using tuple_holding_operation::tuple_holding_operation;
+
+ value *evaluate (struct type *expect_type,
+ struct expression *exp,
+ enum noside noside) override
+ {
+ return value_from_longest (std::get<0> (m_storage),
+ std::get<1> (m_storage));
+ }
+
+ enum exp_opcode opcode () const override
+ { return OP_LONG; }
+
+ bool constant_p () const override
+ { return true; }
+
+protected:
+
+ void do_generate_ax (struct expression *exp,
+ struct agent_expr *ax,
+ struct axs_value *value,
+ struct type *cast_type)
+ override;
+};
+
} /* namespace expr */

#endif /* EXPOP_H */
--
2.26.2