ust-compiler.h: Implement __LTTNG_COMPOUND_LITERAL

[lttng-ust.git] / include / lttng / ust-compiler.h

diff --git a/include/lttng/ust-compiler.h b/include/lttng/ust-compiler.h
index d93db35e39419c335674ffe4d9d768b3e2aade69..799bca4291d2802ee590ab628dadc4e956fc1ddf 100644 (file)
--- a/include/lttng/ust-compiler.h
+++ b/include/lttng/ust-compiler.h
@@ -25,5 +25,39 @@
  */
 
 #define lttng_ust_notrace __attribute__((no_instrument_function))
+#define LTTNG_PACKED   __attribute__((__packed__))
+
+/*
+ * Clang supports the no_sanitize variable attribute on global variables.
+ * GCC only supports the no_sanitize_address function attribute, which is
+ * not what we need.
+ */
+#if defined(__clang__)
+# if __has_feature(address_sanitizer)
+#  define __lttng_ust_variable_attribute_no_sanitize_address \
+       __attribute__((no_sanitize("address")))
+# else
+#  define __lttng_ust_variable_attribute_no_sanitize_address
+# endif
+#else
+#  define __lttng_ust_variable_attribute_no_sanitize_address
+#endif
+
+/*
+ * Compound literals with static storage are needed by LTTng.
+ * Compound literals are part of the C99 and C11 standards, but not
+ * part of the C++ standards. However, those are supported by both g++ and
+ * clang. In order to be strictly C++11 compliant, defining
+ * LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP before including this header
+ * allocates those on the heap in C++.
+ *
+ * Example use:
+ * static struct mystruct *var = __LTTNG_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 });
+ */
+#if defined (__cplusplus) && defined (LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP)
+#define __LTTNG_COMPOUND_LITERAL(type, ...)    new (type) __VA_ARGS__
+#else
+#define __LTTNG_COMPOUND_LITERAL(type, ...)    (type[]) { __VA_ARGS__ }
+#endif
 
 #endif /* _LTTNG_UST_COMPILER_H */