[libvirt] [PATCH v3 01/35] util: alloc: add macros for implementing automatic cleanup functionality

[Sukrit Bhatnagar]

New macros are introduced which help in adding GNU C's cleanup
attribute to variable declarations. Variables declared with these
macros will have their allocated memory freed automatically when
they go out of scope.

Signed-off-by: Sukrit Bhatnagar <skrtbhtngr at gmail.com>
---
 src/util/viralloc.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/src/util/viralloc.h b/src/util/viralloc.h
index 69d0f90..5c1d0d5 100644
--- a/src/util/viralloc.h
+++ b/src/util/viralloc.h
@@ -596,4 +596,48 @@ void virAllocTestInit(void);
 int virAllocTestCount(void);
 void virAllocTestOOM(int n, int m);
 void virAllocTestHook(void (*func)(int, void*), void *data);
+
+# define VIR_AUTOPTR_TYPE_NAME(type) type##AutoPtr
+# define VIR_AUTOPTR_FUNC_NAME(type) type##AutoPtrFree
+
+/**
+ * VIR_DEFINE_AUTOPTR_FUNC:
+ * @type: type of the variable to be freed automatically
+ * @func: cleanup function to be automatically called
+ *
+ * This macro defines a function for automatic freeing of
+ * resources allocated to a variable of type @type. This newly
+ * defined function works as a necessary wrapper around @func.
+ */
+# define VIR_DEFINE_AUTOPTR_FUNC(type, func) \
+    typedef type *VIR_AUTOPTR_TYPE_NAME(type); \
+    static inline void VIR_AUTOPTR_FUNC_NAME(type)(type **_ptr) \
+    { \
+        if (*_ptr) \
+            (func)(*_ptr); \
+        *_ptr = NULL; \
+    } \
+
+/**
+ * VIR_AUTOFREE:
+ * @type: type of the variable to be freed automatically
+ *
+ * Macro to automatically free the memory allocated to
+ * the variable declared with it by calling virFree
+ * when the variable goes out of scope.
+ */
+# define VIR_AUTOFREE(type) __attribute__((cleanup(virFree))) type
+
+/**
+ * VIR_AUTOPTR:
+ * @type: type of the variable to be freed automatically
+ *
+ * Macro to automatically free the memory allocated to
+ * the variable declared with it by calling the function
+ * defined by VIR_DEFINE_AUTOPTR_FUNC when the variable
+ * goes out of scope.
+ */
+# define VIR_AUTOPTR(type) \
+    __attribute__((cleanup(VIR_AUTOPTR_FUNC_NAME(type)))) VIR_AUTOPTR_TYPE_NAME(type)
+
 #endif /* __VIR_MEMORY_H_ */
-- 
1.8.3.1