X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fcompiler.h;h=cfe90666017bf4aeed4ab04aabb8b1c5724292dc;hb=124f09c9279ae41eba4bf0d6419387e8ec9a1a78;hp=1c01fd1d6a78d18b643d095afbf20659259a1de7;hpb=97be153858b4cd175cbe7862b8e1624bf22ab98a;p=sliver-openvswitch.git

diff --git a/lib/compiler.h b/lib/compiler.h
index 1c01fd1d6..cfe906660 100644
--- a/lib/compiler.h
+++ b/lib/compiler.h
@@ -1,5 +1,5 @@
 /*
- * 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.
@@ -20,11 +20,15 @@
 #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))
@@ -36,6 +40,7 @@
 #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
@@ -65,6 +70,16 @@
  *      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
@@ -81,8 +96,9 @@
  *    - 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:
  *
@@ -92,7 +108,7 @@
  *    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__)))
@@ -114,30 +130,12 @@
 #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(...)
@@ -150,9 +148,11 @@
 #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
@@ -179,4 +179,45 @@
 #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 */