diff mbox series

[2/5] fsdev/p9array.h: check scalar type in P9ARRAY_NEW()

Message ID c1965e2a096835dc9e1d4d659dfb15d96755cbe0.1633097129.git.qemu_oss@crudebyte.com
State New
Headers show
Series 9pfs: introduce P9Array | expand

Commit Message

Christian Schoenebeck Oct. 1, 2021, 2:27 p.m. UTC 
Make sure at compile time that the scalar type of the array
requested to be created via P9ARRAY_NEW() matches the scalar
type of the passed auto reference variable (unique pointer).

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
---
 fsdev/p9array.h | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/fsdev/p9array.h b/fsdev/p9array.h
index fff946a3d7..6aa25327ca 100644
--- a/fsdev/p9array.h
+++ b/fsdev/p9array.h
@@ -27,6 +27,8 @@ 
 #ifndef QEMU_P9ARRAY_H
 #define QEMU_P9ARRAY_H
 
+#include "qemu/compiler.h"
+
 /**
  * P9Array provides a mechanism to access arrays in common C-style (e.g. by
  * square bracket [] operator) in conjunction with reference variables that
@@ -149,6 +151,10 @@ 
  * @param len - amount of array elements to be allocated immediately
  */
 #define P9ARRAY_NEW(scalar_type, auto_var, len) \
+    QEMU_BUILD_BUG_MSG( \
+        !__builtin_types_compatible_p(scalar_type, typeof(*auto_var)), \
+        "P9Array scalar type mismatch" \
+    ); \
     p9array_new_##scalar_type((&auto_var), len)
 
 #endif /* QEMU_P9ARRAY_H */