[Xen-devel] [PATCH 06/22] tools: move CONTAINER_OF to xentoolcore_internal.h

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
---
 tools/libs/toolcore/include/xentoolcore_internal.h | 42 ++++++++++++++++++++++
 tools/libxl/libxl_internal.h                       | 30 ----------------
 2 files changed, 42 insertions(+), 30 deletions(-)

diff --git a/tools/libs/toolcore/include/xentoolcore_internal.h 
b/tools/libs/toolcore/include/xentoolcore_internal.h
index 670e29d..27497d6 100644
--- a/tools/libs/toolcore/include/xentoolcore_internal.h
+++ b/tools/libs/toolcore/include/xentoolcore_internal.h
@@ -24,6 +24,8 @@
 #ifndef XENTOOLCORE_INTERNAL_H
 #define XENTOOLCORE_INTERNAL_H
 
+#include <stddef.h>
+
 #include "xentoolcore.h"
 #include "_xentoolcore_list.h"
 
@@ -89,6 +91,46 @@ struct Xentoolcore__Active_Handle {
 void xentoolcore__register_active_handle(Xentoolcore__Active_Handle*);
 void xentoolcore__deregister_active_handle(Xentoolcore__Active_Handle*);
 
+/* ---------- convenient stuff ---------- */
+
+/*
+ * This does not appear in xentoolcore.h because it is a bit
+ * namespace-unclean.
+ */
+
+/*
+ * Convenience macros.
+ */
+
+/*
+ * CONTAINER_OF work like this.  Given:
+ *    typedef struct {
+ *      ...
+ *      member_type member_name;
+ *      ...
+ *    } outer_type;
+ *    outer_type outer, *outer_var;
+ *    member_type *inner_ptr = &outer->member_name;
+ *
+ * Then, effectively:
+ *    outer_type *CONTAINER_OF(member_type *inner_ptr,
+ *                             *outer_var, // or type name for outer_type
+ *                             member_name);
+ *
+ * So that:
+ *    CONTAINER_OF(inner_ptr, *outer_var, member_name) == &outer
+ *    CONTAINER_OF(inner_ptr, outer_type, member_name) == &outer
+ */
+#define CONTAINER_OF(inner_ptr, outer, member_name)                     \
+    ({                                                                  \
+        typeof(outer) *container_of_;                                   \
+        container_of_ = (void*)((char*)(inner_ptr) -                    \
+                                offsetof(typeof(outer), member_name));  \
+        (void)(&container_of_->member_name ==                           \
+               (typeof(inner_ptr))0) /* type check */;                  \
+        container_of_;                                                  \
+    })
+
 #endif /* XENTOOLCORE_INTERNAL_H */
 
 /*
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 04be10a..4f2f433 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -3804,36 +3804,6 @@ _hidden void libxl__remus_restore_setup(libxl__egc *egc,
  * Convenience macros.
  */
 
-/*
- * CONTAINER_OF work like this.  Given:
- *    typedef struct {
- *      ...
- *      member_type member_name;
- *      ...
- *    } outer_type;
- *    outer_type outer, *outer_var;
- *    member_type *inner_ptr = &outer->member_name;
- *
- * Then, effectively:
- *    outer_type *CONTAINER_OF(member_type *inner_ptr,
- *                             *outer_var, // or type name for outer_type
- *                             member_name);
- *
- * So that:
- *    CONTAINER_OF(inner_ptr, *outer_var, member_name) == &outer
- *    CONTAINER_OF(inner_ptr, outer_type, member_name) == &outer
- */
-#define CONTAINER_OF(inner_ptr, outer, member_name)                     \
-    ({                                                                  \
-        typeof(outer) *container_of_;                                   \
-        container_of_ = (void*)((char*)(inner_ptr) -                    \
-                                offsetof(typeof(outer), member_name));  \
-        (void)(&container_of_->member_name ==                           \
-               (typeof(inner_ptr))0) /* type check */;                  \
-        container_of_;                                                  \
-    })
-
-
 #define FILLZERO LIBXL_FILLZERO
 
 
-- 
2.1.4


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