[PATCH 113/203] Introduce unop_alignof_operation

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

This adds class unop_alignof_operation, which implements UNOP_ALIGNOF.

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

* expop.h (class unop_alignof_operation): New.
* eval.c (eval_op_alignof): No longer static.
---
gdb/ChangeLog | 5 +++++
gdb/eval.c | 2 +-
gdb/expop.h | 25 +++++++++++++++++++++++++
3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/gdb/eval.c b/gdb/eval.c
index f07990932b9..526c80de92b 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -1856,7 +1856,7 @@ eval_op_ind (struct type *expect_type, struct expression *exp,

/* A helper function for UNOP_ALIGNOF. */

-static struct value *
+struct value *
eval_op_alignof (struct type *expect_type, struct expression *exp,
enum noside noside,
struct value *arg1)
diff --git a/gdb/expop.h b/gdb/expop.h
index 22af0c824e2..b5f01550d85 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -188,6 +188,10 @@ extern struct value *eval_op_ind (struct type *expect_type,
extern struct value *eval_op_type (struct type *expect_type,
struct expression *exp,
enum noside noside, struct type *type);
+extern struct value *eval_op_alignof (struct type *expect_type,
+ struct expression *exp,
+ enum noside noside,
+ struct value *arg1);

namespace expr
{
@@ -1600,6 +1604,27 @@ class unop_sizeof_operation
override;
};

+/* Implement 'alignof'. */
+class unop_alignof_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
+ {
+ value *val = std::get<0> (m_storage)->evaluate (nullptr, exp,
+ EVAL_AVOID_SIDE_EFFECTS);
+ return eval_op_alignof (expect_type, exp, noside, val);
+ }
+
+ enum exp_opcode opcode () const override
+ { return UNOP_ALIGNOF; }
+};
+
} /* namespace expr */

#endif /* EXPOP_H */
--
2.26.2