#ifndef _MACROS_H
#define _MACROS_H
-#include <stdlib.h>
+#include <common/compat/string.hpp>
+
#include <stddef.h>
+#include <stdlib.h>
#include <string.h>
-#include <common/compat/string.hpp>
+
+#include <memory>
+#include <pthread.h>
+#include <type_traits>
/*
* Takes a pointer x and transform it so we can use it to access members
*/
#define LTTNG_REF(x) ((typeof(*x) *)(x))
+#ifdef NDEBUG
+/*
+* Force usage of the assertion condition to prevent unused variable warnings
+* when `assert()` are disabled by the `NDEBUG` definition.
+*/
+# define LTTNG_ASSERT(_cond) ((void) sizeof((void) (_cond), 0))
+#else
+# include <assert.h>
+# define LTTNG_ASSERT(_cond) assert(_cond)
+#endif
+
/*
* Memory allocation zeroed
*/
+
static inline
-void *zmalloc(size_t len)
+void *zmalloc_internal(size_t size)
{
- return calloc(1, len);
+ return calloc(1, size);
}
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0])))
+template <typename T>
+struct can_malloc
+{
+ /*
+ * gcc versions before 5.0 lack some type traits defined in C++11.
+ * Since in this instance we use the trait to prevent misuses
+ * of malloc (and statically assert) and not to generate different
+ * code based on this property, simply set value to true and allow
+ * the code to compile. Anyone using a contemporary compiler will
+ * catch the error.
+ */
+#if __GNUG__ && __GNUC__ < 5
+ static constexpr bool value = true;
+#else
+ static constexpr bool value = std::is_trivially_constructible<T>::value;
+#endif
+};
+
+/*
+ * Malloc and zero-initialize an object of type T, asserting that T can be
+ * safely malloc-ed (is trivially constructible).
+ */
+template<typename T>
+T *zmalloc()
+{
+ static_assert (can_malloc<T>::value, "type can be malloc'ed");
+ return (T *) zmalloc_internal(sizeof(T));
+}
+
+/*
+ * Malloc and zero-initialize a buffer of size `size`, asserting that type T
+ * can be safely malloc-ed (is trivially constructible).
+ */
+template<typename T>
+T *zmalloc(size_t size)
+{
+ static_assert (can_malloc<T>::value, "type can be malloc'ed");
+ LTTNG_ASSERT(size >= sizeof(T));
+ return (T *) zmalloc_internal(size);
+}
+
+/*
+ * Malloc and zero-initialize an array of `nmemb` elements of type T,
+ * asserting that T can be safely malloc-ed (is trivially constructible).
+ */
+template<typename T>
+T *calloc(size_t nmemb)
+{
+ static_assert (can_malloc<T>::value, "type can be malloc'ed");
+ return (T *) zmalloc_internal(nmemb * sizeof(T));
+}
+
+/*
+ * Malloc an object of type T, asserting that T can be safely malloc-ed (is
+ * trivially constructible).
+ */
+template<typename T>
+T *malloc()
+{
+ static_assert (can_malloc<T>::value, "type can be malloc'ed");
+ return (T *) malloc(sizeof(T));
+}
+
+/*
+ * Malloc a buffer of size `size`, asserting that type T can be safely
+ * malloc-ed (is trivially constructible).
+ */
+template<typename T>
+T *malloc(size_t size)
+{
+ static_assert (can_malloc<T>::value, "type can be malloc'ed");
+ return (T *) malloc(size);
+}
+
+/*
+ * Prevent using `free` on types that are non-POD.
+ *
+ * Declare a delete prototype of free if the parameter type is not safe to free
+ * (non-POD).
+ *
+ * If the parameter is a pointer to void, we can't check if what is pointed
+ * to is safe to free or not, as we don't know what is pointed to. Ideally,
+ * all calls to free would be with a typed pointer, but there are too many
+ * instances of passing a pointer to void to enforce that right now. So allow
+ * pointers to void, these will not be checked.
+ */
+
+template<typename T>
+struct can_free
+{
+ /*
+ * gcc versions before 5.0 lack some type traits defined in C++11.
+ * Since in this instance we use the trait to prevent misuses
+ * of free (and statically assert) and not to generate different
+ * code based on this property, simply set value to true and allow
+ * the code to compile. Anyone using a contemporary compiler will
+ * catch the error.
+ */
+#if __GNUG__ && __GNUC__ < 5
+ static constexpr bool value = true;
+#else
+ static constexpr bool value = std::is_trivially_destructible<T>::value || std::is_void<T>::value;
#endif
+};
+
+template<typename T, typename = typename std::enable_if<!can_free<T>::value>::type>
+void free(T *p) = delete;
+
+template<typename T>
+struct can_memset
+{
+ static constexpr bool value = std::is_pod<T>::value || std::is_void<T>::value;
+};
+
+template <typename T, typename = typename std::enable_if<!can_memset<T>::value>::type>
+void *memset(T *s, int c, size_t n) = delete;
-#ifndef container_of
-#define container_of(ptr, type, member) \
- ({ \
- const typeof(((type *)NULL)->member) * __ptr = (ptr); \
- (type *)((char *)__ptr - offsetof(type, member)); \
- })
+template<typename T>
+struct can_memcpy
+{
+ /*
+ * gcc versions before 5.0 lack some type traits defined in C++11.
+ * Since in this instance we use the trait to prevent misuses
+ * of memcpy (and statically assert) and not to generate different
+ * code based on this property, simply set value to true and allow
+ * the code to compile. Anyone using a contemporary compiler will
+ * catch the error.
+ */
+#if __GNUG__ && __GNUC__ < 5
+ static constexpr bool value = true;
+#else
+ static constexpr bool value = std::is_trivially_copyable<T>::value;
+#endif
+};
+
+template <typename T, typename U,
+ typename = typename std::enable_if<!can_memcpy<T>::value>::type,
+ typename = typename std::enable_if<!can_memcpy<U>::value>::type>
+void *memcpy(T *d, const U *s, size_t n) = delete;
+
+template<typename T>
+struct can_memmove
+{
+ /*
+ * gcc versions before 5.0 lack some type traits defined in C++11.
+ * Since in this instance we use the trait to prevent misuses
+ * of memmove (and statically assert) and not to generate different
+ * code based on this property, simply set value to true and allow
+ * the code to compile. Anyone using a contemporary compiler will
+ * catch the error.
+ */
+#if __GNUG__ && __GNUC__ < 5
+ static constexpr bool value = true;
+#else
+ static constexpr bool value = std::is_trivially_copyable<T>::value;
+#endif
+};
+
+template <typename T, typename U,
+ typename = typename std::enable_if<!can_memmove<T>::value>::type,
+ typename = typename std::enable_if<!can_memmove<U>::value>::type>
+void *memmove(T *d, const U *s, size_t n) = delete;
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0])))
#endif
#ifndef LTTNG_PACKED
# define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL \
_Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
# define DIAGNOSTIC_IGNORE_LOGICAL_OP
+# define DIAGNOSTIC_IGNORE_DUPLICATED_BRANCHES
+# define DIAGNOSTIC_IGNORE_INVALID_OFFSETOF
+ _Pragma("GCC diagnostic ignored \"-Winvalid-offsetof\"")
#else
/* GCC */
# define DIAGNOSTIC_IGNORE_SUGGEST_ATTRIBUTE_FORMAT \
_Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
# define DIAGNOSTIC_IGNORE_LOGICAL_OP \
_Pragma("GCC diagnostic ignored \"-Wlogical-op\"")
+#if __GNUG__ && __GNUC__ >= 7
+# define DIAGNOSTIC_IGNORE_DUPLICATED_BRANCHES \
+ _Pragma("GCC diagnostic ignored \"-Wduplicated-branches\"")
+#else
+# define DIAGNOSTIC_IGNORE_DUPLICATED_BRANCHES
+#endif /* __GNUG__ && __GNUC__ >= 7 */
+# define DIAGNOSTIC_IGNORE_INVALID_OFFSETOF \
+ _Pragma("GCC diagnostic ignored \"-Winvalid-offsetof\"")
#endif
/* Used to make specific C++ functions to C code. */
return 0;
}
-#ifdef NDEBUG
-/*
-* Force usage of the assertion condition to prevent unused variable warnings
-* when `assert()` are disabled by the `NDEBUG` definition.
-*/
-# define LTTNG_ASSERT(_cond) ((void) sizeof((void) (_cond), 0))
-#else
-# include <assert.h>
-# define LTTNG_ASSERT(_cond) assert(_cond)
-#endif
+namespace lttng {
+namespace utils {
+template <class Parent, class Member>
+Parent *container_of(const Member *member, const Member Parent::*ptr_to_member)
+{
+ const Parent *dummy_parent = nullptr;
+ auto *offset_of_member = reinterpret_cast<const char *>(&(dummy_parent->*ptr_to_member));
+ auto address_of_parent = reinterpret_cast<const char *>(member) - offset_of_member;
+
+ return reinterpret_cast<Parent *>(address_of_parent);
+}
+} /* namespace utils */
+} /* namespace lttng */
#endif /* _MACROS_H */
projects / lttng-tools.git / blobdiff