X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=include%2Flttng%2Fust-compiler.h;h=e81246a34b63a2cfb374467e211c93286a749a65;hb=63661b6634527fca365d4ac9e46cc9c8c94c1e49;hp=32fd1bb25ed9ddb3a984b3882969c5c72b348f20;hpb=439f90cfdec9b31db16000c9310b67acb797b93e;p=lttng-ust.git

diff --git a/include/lttng/ust-compiler.h b/include/lttng/ust-compiler.h
index 32fd1bb2..e81246a3 100644
--- a/include/lttng/ust-compiler.h
+++ b/include/lttng/ust-compiler.h
@@ -10,6 +10,16 @@
 
 #include <assert.h>
 
+/*
+ * By default, LTTng-UST uses the priority 150 for the tracepoint and probe
+ * provider constructors to trace tracepoints located within
+ * constructors/destructors with a higher priority value within the same
+ * module. This priority can be overridden by the application.
+ */
+#ifndef LTTNG_UST_CONSTRUCTOR_PRIO
+#define LTTNG_UST_CONSTRUCTOR_PRIO	150
+#endif
+
 #define lttng_ust_notrace __attribute__((no_instrument_function))
 
 /*
@@ -32,8 +42,8 @@
  * g++ 4.8 and prior do not support C99 compound literals. Therefore,
  * force allocating those on the heap with these C++ compilers.
  */
-#if defined (__cplusplus) && defined (__GNUC__) && \
-	(__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ <= 8))
+#if defined (__cplusplus) && !defined (__clang__) && defined (__GNUC__) && \
+	((__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ <= 8)))
 # ifndef LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP
 #  define LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP
 # endif
@@ -65,9 +75,12 @@
  *   static assertion. This parameter must be a valid C identifier as it will
  *   be used as a typedef name.
  */
-#if defined (__cplusplus) || __STDC_VERSION__ >= 201112L
+#ifdef __cplusplus
 #define lttng_ust_static_assert(predicate, msg, c_identifier_msg)  \
 	static_assert(predicate, msg)
+#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
+#define lttng_ust_static_assert(predicate, msg, c_identifier_msg)  \
+	_Static_assert(predicate, msg)
 #else
 /*
  * Evaluates the predicate and emit a compilation error on failure.
@@ -83,4 +96,61 @@
     typedef char lttng_ust_static_assert_##c_identifier_msg[2*!!(predicate)-1]
 #endif
 
+/* Combine two tokens. */
+#define LTTNG_UST_COMPILER__COMBINE_TOKENS(_tokena, _tokenb)			\
+		_tokena##_tokenb
+#define LTTNG_UST_COMPILER_COMBINE_TOKENS(_tokena, _tokenb)			\
+		LTTNG_UST_COMPILER__COMBINE_TOKENS(_tokena, _tokenb)
+/*
+ * Wrap constructor and destructor functions to invoke them as functions with
+ * the constructor/destructor GNU C attributes when building as C, or as the
+ * constructor/destructor of a variable defined within an anonymous namespace
+ * when building as C++.
+ */
+#ifdef __cplusplus
+#define LTTNG_UST_DECLARE_CONSTRUCTOR_DESTRUCTOR(name, constructor_func,	\
+						 destructor_func, ...)		\
+namespace lttng {								\
+namespace ust {									\
+namespace details {								\
+class LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_,      \
+				   name) {					\
+public:										\
+	LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() __VA_ARGS__; \
+	~LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() __VA_ARGS__; \
+};										\
+LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)::LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() \
+{										\
+	constructor_func();							\
+}										\
+LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)::~LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() \
+{										\
+	destructor_func();							\
+}										\
+}										\
+}										\
+}										\
+										\
+namespace {									\
+const lttng::ust::details::LTTNG_UST_COMPILER_COMBINE_TOKENS(			\
+	lttng_ust_constructor_destructor_, name)				\
+		LTTNG_UST_COMPILER_COMBINE_TOKENS(name, registration_instance); \
+}
+#else /* __cplusplus */
+#define LTTNG_UST_DECLARE_CONSTRUCTOR_DESTRUCTOR(name, constructor_func,	\
+						 destructor_func, ...)		\
+	static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_, name)(void) \
+		__attribute__((constructor(LTTNG_UST_CONSTRUCTOR_PRIO))) __VA_ARGS__; \
+	static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_, name)(void) \
+	{									\
+		constructor_func();						\
+	}									\
+	static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_destructor_, name)(void) \
+		__attribute__((destructor(LTTNG_UST_CONSTRUCTOR_PRIO))) __VA_ARGS__; \
+	static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_destructor_, name)(void) \
+	{									\
+		destructor_func();						\
+	}
+#endif
+
 #endif /* _LTTNG_UST_COMPILER_H */