#include <xbt/misc.h> // xbt_procname
#include <xbt/virtu.h> // xbt_getpid
+/** @addtogroup XBT_ex
+ * @brief Exceptions support
+ */
+
namespace simgrid {
namespace xbt {
+/** A backtrace
+ *
+ * This is used (among other things) in exceptions to store the associated
+ * backtrace.
+ *
+ * @ingroup XBT_ex
+ */
typedef std::vector<xbt_backtrace_location_t> Backtrace;
-/** A polymorphic mixin class for adding context to an exception */
+/** The location of where an exception has been throwed
+ *
+ * This is a tuple (__FILE__, __LINE__, __func__) and can be created with
+ * @ref XBT_THROW_POINT.
+ *
+ * @ingroup XBT_ex
+ */
+class ThrowPoint {
+ public:
+ ThrowPoint() = default;
+ explicit ThrowPoint(const char* file, int line, const char* function) : file(file), line(line), function(function) {}
+ const char* file = nullptr;
+ int line = 0;
+ const char* function = nullptr;
+};
+
+/** Create a ThrowPoint with (__FILE__, __LINE__, __func__) */
+#define XBT_THROW_POINT ::simgrid::xbt::ThrowPoint(__FILE__, __LINE__, __func__)
+
+/** A base class for exceptions with context
+ *
+ * This is a base class for exceptions which store additional contextual
+ * infomations about them: backtrace, throw point, simulated process name
+ * and PID, etc.
+ *
+ * You are not expected to inherit from it. Instead of you use should
+ * @ref XBT_THROW an exception which will throw a subclass of your original
+ * exception with those additional features.
+ *
+ * However, you can try `dynamic_cast` an exception to this type in order to
+ * get contextual information about the exception.
+ */
XBT_PUBLIC_CLASS WithContextException {
public:
WithContextException() :
procname_(xbt_procname()),
pid_(xbt_getpid())
{}
+ WithContextException(ThrowPoint throwpoint, Backtrace bt) :
+ backtrace_(std::move(bt)),
+ procname_(xbt_procname()),
+ pid_(xbt_getpid()),
+ throwpoint_(throwpoint)
+ {}
virtual ~WithContextException();
Backtrace const& backtrace() const
{
}
int pid() const { return pid_; }
std::string const& processName() const { return procname_; }
+ ThrowPoint& throwPoint() { return throwpoint_; }
private:
Backtrace backtrace_;
std::string procname_; /**< Name of the process who thrown this */
int pid_; /**< PID of the process who thrown this */
+ ThrowPoint throwpoint_;
};
-/** Internal class used to mixin the two classes */
+/** Internal class used to mixin an exception E with WithContextException */
template<class E>
class WithContext : public E, public WithContextException
{
public:
- WithContext(E exception)
- : E(std::move(exception)) {}
- WithContext(E exception, Backtrace backtrace)
- : E(std::move(exception)), WithContextException(std::move(backtrace)) {}
- WithContext(E exception, WithContextException context)
- : E(std::move(exception)), WithContextException(std::move(context)) {}
+ static_assert(not std::is_base_of<WithContextException, E>::value, "Trying to appli WithContext twice");
+
+ WithContext(E exception) :
+ E(std::move(exception)) {}
+ WithContext(E exception, ThrowPoint throwpoint, Backtrace backtrace) :
+ E(std::move(exception)),
+ WithContextException(throwpoint, std::move(backtrace)) {}
+ WithContext(E exception, Backtrace backtrace) :
+ E(std::move(exception)),
+ WithContextException(std::move(backtrace)) {}
+ WithContext(E exception, WithContextException context) :
+ E(std::move(exception)),
+ WithContextException(std::move(context)) {}
~WithContext() override {}
};
-/** Throw a given exception a context
+/** Throw a C++ exception with some context
*
- * @param exception exception to throw
- * @param backtrace backtrace to attach
+ * @param e Exception to throw
+ * @ingroup XBT_ex
*/
-template<class E>
-[[noreturn]] inline
-typename std::enable_if< !std::is_base_of<WithContextException,E>::value >::type
-throwWithContext(
- E exception,
- // Thanks to the default argument, we are taking the backtrace in the caller:
- Backtrace backtrace = simgrid::xbt::backtrace())
-{
- throw WithContext<E>(std::move(exception), std::move(backtrace));
-}
+#define XBT_THROW(e) \
+ throw WithContext<E>(std::move(exception), throwpoint, simgrid::xbt::backtrace())
+
+/** Throw a C++ exception with a context and a nexted exception/cause
+ *
+ * @param e Exception to throw
+ * @ingroup XBT_ex
+ */
+#define XBT_THROW_NESTED(e) \
+ std::throw_with_nested(WithContext<E>(std::move(exception), throwpoint, simgrid::xbt::backtrace()))
}
}
