#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))
/*
#ifdef __cplusplus
#define lttng_ust_static_assert(predicate, msg, c_identifier_msg) \
static_assert(predicate, msg)
-#elif __STDC_VERSION__ >= 201112L
+#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.
*
- * If the predicate evaluates to true, this macro emits a typedef of an array
- * of size 0.
+ * If the predicate evaluates to true, this macro emits a function
+ * prototype with an argument type which is an array of size 0.
*
- * If the predicate evaluates to false, this macro emits a typedef of an array
- * of negative size which is invalid in C and forces a compiler error. The msg
- * parameter is used in the tentative typedef so it is printed to the user.
+ * If the predicate evaluates to false, this macro emits a function
+ * prototype with an argument type which is an array of negative size
+ * which is invalid in C and forces a compiler error. The
+ * c_identifier_msg parameter is used as the argument identifier so it
+ * is printed to the user when the error is reported.
*/
#define lttng_ust_static_assert(predicate, msg, c_identifier_msg) \
- typedef char lttng_ust_static_assert_##c_identifier_msg[2*!!(predicate)-1]
+ void lttng_ust_static_assert_proto(char c_identifier_msg[2*!!(predicate)-1])
#endif
/* Combine two tokens. */
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++.
+ * the constructor/destructor GNU C attributes, which ensures that those
+ * constructors/destructors are ordered before/after C++
+ * constructors/destructors.
+ *
+ * Wrap constructor and destructor functions as the constructor/destructor of a
+ * variable defined within an anonymous namespace when building as C++ with
+ * LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP defined. With this option,
+ * there are no guarantees that the events in C++ constructors/destructors will
+ * be traced.
*/
-#ifdef __cplusplus
+#if defined (__cplusplus) && defined (LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP)
#define LTTNG_UST_DECLARE_CONSTRUCTOR_DESTRUCTOR(name, constructor_func, \
destructor_func, ...) \
namespace lttng { \
class LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, \
name) { \
public: \
- LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, \
- name)() __VA_ARGS__ \
- { \
- constructor_func(); \
- } \
- ~LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, \
- name)() __VA_ARGS__ \
- { \
- destructor_func(); \
- } \
+ 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(); \
+} \
} \
} \
} \
lttng_ust_constructor_destructor_, name) \
LTTNG_UST_COMPILER_COMBINE_TOKENS(name, registration_instance); \
}
-#else /* __cplusplus */
+#else
#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)) __VA_ARGS__; \
+ __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)) __VA_ARGS__; \
+ __attribute__((destructor(LTTNG_UST_CONSTRUCTOR_PRIO))) __VA_ARGS__; \
static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_destructor_, name)(void) \
{ \
destructor_func(); \