Hello, I've implemented a patch for clang that enables compile-time checking of <pointer, type tag> arguments to functions. When applied to MPI, this enables the compiler to check that buffer type and MPI_Datatype match.
Latest version of clang patch can be found here. [1] Please note that
clang patch was not yet accepted to clang trunk.
On the OpenMPI side we need to:
* add attributes to MPI functions to mark them as accepting pointers
with type tags;
* add attributes to ompi_mpi_* declarations to mark them as type tags.
All in all, the changes boil down to:
1. Annotate type tags:
OMPI_DECLSPEC extern struct ompi_predefined_datatype_t
ompi_mpi_float OMPI_ATTR_TYPE_TAG(float);
2. Annotate functions:
OMPI_DECLSPEC int MPI_Send(void *buf, int count, MPI_Datatype
datatype, int dest,
int tag, MPI_Comm comm)
OMPI_ATTR_POINTER_WITH_TYPE_TAG(1,3);
where OMPI_ATTR* are macros that are defined to attributes when
compiling under clang with this feature.
Attached is the OpenMPI patch I've arrived to. Although I tried to be
attentive, changes to mpi.h are very repetitive and error-prone, so
please review them closely.
I've implemented a similar patch for MPICH2. [2] OpenMPI developers
might want to follow that discussion, too.
Dmitri
[1]
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20120521/058137.html
[2] http://lists.mcs.anl.gov/pipermail/mpich2-dev/2012-May/000938.html
--
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <griboz...@gmail.com>*/
ompi-v2.patch
Description: Binary data
