tidy - mpi-buffer-deref — Extra Clang Tools 22.0.0git documentation (original) (raw)

This check verifies if a buffer passed to an MPI (Message Passing Interface) function is sufficiently dereferenced. Buffers should be passed as a single pointer or array. As MPI function signatures specify void * for their buffer types, insufficiently dereferenced buffers can be passed, like for example as double pointers or multidimensional arrays, without a compiler warning emitted.

Examples:

// A double pointer is passed to the MPI function. char *buf; MPI_Send(&buf, 1, MPI_CHAR, 0, 0, MPI_COMM_WORLD);

// A multidimensional array is passed to the MPI function. short buf[1][1]; MPI_Send(buf, 1, MPI_SHORT, 0, 0, MPI_COMM_WORLD);

// A pointer to an array is passed to the MPI function. short *buf[1]; MPI_Send(buf, 1, MPI_SHORT, 0, 0, MPI_COMM_WORLD);