/*
- * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#ifndef __has_feature
#define __has_feature(x) 0
#endif
+#ifndef __has_extension
+ #define __has_extension(x) 0
+#endif
#if __GNUC__ && !__CHECKER__
#define NO_RETURN __attribute__((__noreturn__))
#define OVS_UNUSED __attribute__((__unused__))
#define PRINTF_FORMAT(FMT, ARG1) __attribute__((__format__(printf, FMT, ARG1)))
+#define SCANF_FORMAT(FMT, ARG1) __attribute__((__format__(scanf, FMT, ARG1)))
#define STRFTIME_FORMAT(FMT) __attribute__((__format__(__strftime__, FMT, 0)))
#define MALLOC_LIKE __attribute__((__malloc__))
#define ALWAYS_INLINE __attribute__((always_inline))
#define NO_RETURN
#define OVS_UNUSED
#define PRINTF_FORMAT(FMT, ARG1)
+#define SCANF_FORMAT(FMT, ARG1)
#define STRFTIME_FORMAT(FMT)
#define MALLOC_LIKE
#define ALWAYS_INLINE
* while the specific MUTEX is held.
*
*
+ * On a variable A of mutex type:
+ *
+ * - OVS_ACQ_BEFORE(B), where B is a mutex or a comma-separated list of
+ * mutexes, declare that if both A and B are acquired at the same time,
+ * then A must be acquired before B. That is, B nests inside A.
+ *
+ * - OVS_ACQ_AFTER(B) is the opposite of OVS_ACQ_BEFORE(B), that is, it
+ * declares that A nests inside B.
+ *
+ *
* On a function, the following attributes apply to mutexes:
*
* - OVS_ACQUIRES(MUTEX) indicate that the function must be called without
* - OVS_REQUIRES(MUTEX) indicate that the function may only be called with
* MUTEX held and that the function does not release MUTEX.
*
- * - OVS_LOCKS_EXCLUDED(MUTEX) indicates that the function may only be
- * called when MUTEX is not held.
+ * - OVS_EXCLUDED(MUTEX) indicates that the function may only be called when
+ * MUTEX is not held.
+ *
*
* The following variants, with the same syntax, apply to reader-writer locks:
*
* OVS_RELEASES OVS_RELEASES OVS_RELEASES
* OVS_TRY_LOCK OVS_TRY_RDLOCK OVS_TRY_WRLOCK
* OVS_REQUIRES OVS_REQ_RDLOCK OVS_REQ_WRLOCK
- * OVS_LOCKS_EXCLUDED OVS_LOCKS_EXCLUDED OVS_LOCKS_EXCLUDED
+ * OVS_EXCLUDED OVS_EXCLUDED OVS_EXCLUDED
*/
#define OVS_LOCKABLE __attribute__((lockable))
#define OVS_REQ_RDLOCK(...) __attribute__((shared_locks_required(__VA_ARGS__)))
#define OVS_GUARDED __attribute__((guarded_var))
#define OVS_GUARDED_BY(...) __attribute__((guarded_by(__VA_ARGS__)))
#define OVS_RELEASES(...) __attribute__((unlock_function(__VA_ARGS__)))
-#define OVS_LOCKS_EXCLUDED(...) __attribute__((locks_excluded(__VA_ARGS__)))
-#elif __CHECKER__
-/* "sparse" annotations for mutexes and mutex-like constructs.
- *
- * Change the thread-safety check annotations to use "context" attribute.
- *
- * OVS_MACRO_LOCK and OVS_MACRO_RELEASE are suitable for use within macros,
- * where there is no function prototype to annotate. */
-#define OVS_LOCKABLE
-#define OVS_REQ_RDLOCK(...) __attribute__((context(MUTEX, 1, 1)))
-#define OVS_ACQ_RDLOCK(...) __attribute__((context(MUTEX, 0, 1)))
-#define OVS_REQ_WRLOCK(...) __attribute__((context(MUTEX, 1, 1)))
-#define OVS_ACQ_WRLOCK(...) __attribute__((context(MUTEX, 0, 1)))
-#define OVS_REQUIRES(...) __attribute__((context(MUTEX, 1, 1)))
-#define OVS_ACQUIRES(...) __attribute__((context(MUTEX, 0, 1)))
-#define OVS_TRY_WRLOCK(RETVAL, ...)
-#define OVS_TRY_RDLOCK(RETVAL, ...)
-#define OVS_TRY_LOCK(REVAL, ...)
-#define OVS_GUARDED
-#define OVS_GUARDED_BY(...)
-#define OVS_RELEASES(...) __attribute__((context(MUTEX, 1, 0)))
-#define OVS_MACRO_LOCK(...) __context__(MUTEX, 0, 1)
-#define OVS_MACRO_RELEASE(...) __context__(MUTEX, 1, 0)
-#else
+#define OVS_EXCLUDED(...) __attribute__((locks_excluded(__VA_ARGS__)))
+#define OVS_ACQ_BEFORE(...) __attribute__((acquired_before(__VA_ARGS__)))
+#define OVS_ACQ_AFTER(...) __attribute__((acquired_after(__VA_ARGS__)))
+#define OVS_NO_THREAD_SAFETY_ANALYSIS \
+ __attribute__((no_thread_safety_analysis))
+#else /* not Clang */
#define OVS_LOCKABLE
#define OVS_REQ_RDLOCK(...)
#define OVS_ACQ_RDLOCK(...)
#define OVS_TRY_LOCK(...)
#define OVS_GUARDED
#define OVS_GUARDED_BY(...)
+#define OVS_EXCLUDED(...)
#define OVS_RELEASES(...)
-#define OVS_MACRO_LOCK(...)
-#define OVS_MACRO_RELEASE(...)
+#define OVS_ACQ_BEFORE(...)
+#define OVS_ACQ_AFTER(...)
+#define OVS_NO_THREAD_SAFETY_ANALYSIS
#endif
/* ISO C says that a C implementation may choose any integer type for an enum
#define OVS_PACKED(DECL) __pragma(pack(push, 1)) DECL __pragma(pack(pop))
#endif
+/* For defining a structure whose instances should aligned on an N-byte
+ * boundary.
+ *
+ * e.g. The following:
+ * OVS_ALIGNED_STRUCT(64, mystruct) { ... };
+ * is equivalent to the following except that it specifies 64-byte alignment:
+ * struct mystruct { ... };
+ */
+#ifndef _MSC_VER
+#define OVS_ALIGNED_STRUCT(N, TAG) struct __attribute__((aligned(N))) TAG
+#else
+#define OVS_ALIGNED_STRUCT(N, TAG) __declspec(align(N)) struct TAG
+#endif
+
+#ifdef _MSC_VER
+#define CCALL __cdecl
+#pragma section(".CRT$XCU",read)
+#define OVS_CONSTRUCTOR(f) \
+ static void __cdecl f(void); \
+ __declspec(allocate(".CRT$XCU")) void (__cdecl*f##_)(void) = f; \
+ static void __cdecl f(void)
+#else
+#define OVS_CONSTRUCTOR(f) \
+ static void f(void) __attribute__((constructor)); \
+ static void f(void)
+#endif
+
+/* OVS_PREFETCH() can be used to instruct the CPU to fetch the cache
+ * line containing the given address to a CPU cache.
+ * OVS_PREFETCH_WRITE() should be used when the memory is going to be
+ * written to. Depending on the target CPU, this can generate the same
+ * instruction as OVS_PREFETCH(), or bring the data into the cache in an
+ * exclusive state. */
+#if __GNUC__
+#define OVS_PREFETCH(addr) __builtin_prefetch((addr))
+#define OVS_PREFETCH_WRITE(addr) __builtin_prefetch((addr), 1)
+#else
+#define OVS_PREFETCH(addr)
+#define OVS_PREFETCH_WRITE(addr)
+#endif
+
#endif /* compiler.h */
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