X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/b7dc075d2c3bdf2b384cb8897d16a4c0aa8ab0f7..8006a03b1ef66a0ddd4a4983ef170781a87a7225:/teshsuite/smpi/mpich3-test/datatype/contents.c

diff --git a/teshsuite/smpi/mpich3-test/datatype/contents.c b/teshsuite/smpi/mpich3-test/datatype/contents.c
new file mode 100644
index 0000000000..fb513c30a8
--- /dev/null
+++ b/teshsuite/smpi/mpich3-test/datatype/contents.c
@@ -0,0 +1,867 @@
+/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
+/*
+ *  (C) 2001 by Argonne National Laboratory.
+ *      See COPYRIGHT in top-level directory.
+ */
+#include "mpi.h"
+#include "mpitestconf.h"
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+
+static int verbose = 0;
+
+/* tests */
+int builtin_float_test(void);
+int vector_of_vectors_test(void);
+int optimizable_vector_of_basics_test(void);
+int indexed_of_basics_test(void);
+int indexed_of_vectors_test(void);
+int struct_of_basics_test(void);
+
+/* helper functions */
+char *combiner_to_string(int combiner);
+int parse_args(int argc, char **argv);
+
+int main(int argc, char **argv)
+{
+    int err, errs = 0;
+
+    MPI_Init(&argc, &argv); /* MPI-1.2 doesn't allow for MPI_Init(0,0) */
+    parse_args(argc, argv);
+
+    /* To improve reporting of problems about operations, we
+       change the error handler to errors return */
+    MPI_Comm_set_errhandler( MPI_COMM_WORLD, MPI_ERRORS_RETURN );
+
+    /* perform some tests */
+    err = builtin_float_test();
+    errs += err;
+    if (err) {
+	fprintf(stderr, "Found %d errors in builtin float test.\n", err);
+    }
+
+    err = vector_of_vectors_test();
+    errs += err;
+    if (err) {
+	fprintf(stderr, "Found %d errors in vector of vectors test.\n", err);
+    }
+
+    err = optimizable_vector_of_basics_test();
+    errs += err;
+    if (err) {
+	fprintf(stderr, "Found %d errors in vector of basics test.\n", err);
+    }
+
+    err = indexed_of_basics_test();
+    errs += err;
+    if (err) {
+	fprintf(stderr, "Found %d errors in indexed of basics test.\n", err);
+    }
+
+    err = indexed_of_vectors_test();
+    errs += err;
+    if (err) {
+	fprintf(stderr, "Found %d errors in indexed of vectors test.\n", err);
+    }
+
+#ifdef HAVE_MPI_TYPE_CREATE_STRUCT
+    err = struct_of_basics_test();
+    errs += err;
+#endif
+
+    /* print message and exit */
+    if (errs) {
+	fprintf(stderr, "Found %d errors\n", errs);
+    }
+    else {
+	printf(" No Errors\n");
+    }
+    MPI_Finalize();
+    return 0;
+}
+
+/* builtin_float_test()
+ *
+ * Tests functionality of get_envelope() and get_contents() on a MPI_FLOAT.
+ *
+ * Returns the number of errors encountered.
+ */
+int builtin_float_test(void)
+{
+    int nints, nadds, ntypes, combiner;
+
+    int err, errs = 0;
+
+    err = MPI_Type_get_envelope(MPI_FLOAT,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+    
+    if (combiner != MPI_COMBINER_NAMED) errs++;
+    if (verbose && combiner != MPI_COMBINER_NAMED)
+	fprintf(stderr, "combiner = %s; should be named\n", 
+		combiner_to_string(combiner));
+
+    /* Note: it is erroneous to call MPI_Type_get_contents() on a basic. */
+    return errs;
+}
+
+/* vector_of_vectors_test()
+ *
+ * Builds a vector of a vector of ints.  Assuming an int array of size 9 
+ * integers, and treating the array as a 3x3 2D array, this will grab the 
+ * corners.
+ *
+ * Returns the number of errors encountered.
+ */
+int vector_of_vectors_test(void)
+{
+    MPI_Datatype inner_vector, inner_vector_copy;
+    MPI_Datatype outer_vector;
+
+    int nints, nadds, ntypes, combiner, *ints;
+    MPI_Aint *adds = NULL;
+    MPI_Datatype *types;
+
+    int err, errs = 0;
+
+    /* set up type */
+    err = MPI_Type_vector(2,
+			  1,
+			  2,
+			  MPI_INT,
+			  &inner_vector);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    err = MPI_Type_vector(2,
+			  1,
+			  2,
+			  inner_vector,
+			  &outer_vector);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    /* decode outer vector (get envelope, then contents) */
+    err = MPI_Type_get_envelope(outer_vector,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    if (nints != 3) errs++;
+    if (nadds != 0) errs++;
+    if (ntypes != 1) errs++;
+    if (combiner != MPI_COMBINER_VECTOR) errs++;
+
+    if (verbose) {
+	if (nints != 3) fprintf(stderr, 
+				"outer vector nints = %d; should be 3\n",
+				nints);
+	if (nadds != 0) fprintf(stderr, 
+				"outer vector nadds = %d; should be 0\n",
+				nadds);
+	if (ntypes != 1) fprintf(stderr, 
+				 "outer vector ntypes = %d; should be 1\n",
+				 ntypes);
+	if (combiner != MPI_COMBINER_VECTOR)
+	    fprintf(stderr, "outer vector combiner = %s; should be vector\n",
+		    combiner_to_string(combiner));
+    }
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    ints = malloc(nints * sizeof(*ints));
+    if (nadds) adds = malloc(nadds * sizeof(*adds));
+    types = malloc(ntypes * sizeof(*types));
+
+    /* get contents of outer vector */
+    err = MPI_Type_get_contents(outer_vector,
+				nints,
+				nadds,
+				ntypes,
+				ints,
+				adds,
+				types);
+
+    if (ints[0] != 2) errs++;
+    if (ints[1] != 1) errs++;
+    if (ints[2] != 2) errs++;
+
+    if (verbose) {
+	if (ints[0] != 2) fprintf(stderr, 
+				  "outer vector count = %d; should be 2\n",
+				  ints[0]);
+	if (ints[1] != 1) fprintf(stderr,
+				  "outer vector blocklength = %d; should be 1\n",
+				  ints[1]);
+	if (ints[2] != 2) fprintf(stderr, "outer vector stride = %d; should be 2\n",
+				  ints[2]);
+    }
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    inner_vector_copy = types[0];
+    free(ints);
+    if (nadds) free(adds);
+    free(types);
+
+    /* decode inner vector */
+    err = MPI_Type_get_envelope(inner_vector_copy,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    if (nints != 3) errs++;
+    if (nadds != 0) errs++;
+    if (ntypes != 1) errs++;
+    if (combiner != MPI_COMBINER_VECTOR) errs++;
+
+    if (verbose) {
+	if (nints != 3) fprintf(stderr, 
+				"inner vector nints = %d; should be 3\n",
+				nints);
+	if (nadds != 0) fprintf(stderr, 
+				"inner vector nadds = %d; should be 0\n",
+				nadds);
+	if (ntypes != 1) fprintf(stderr, 
+				 "inner vector ntypes = %d; should be 1\n",
+				 ntypes);
+	if (combiner != MPI_COMBINER_VECTOR)
+	    fprintf(stderr, "inner vector combiner = %s; should be vector\n",
+		    combiner_to_string(combiner));
+    }
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    ints = malloc(nints * sizeof(*ints));
+    if (nadds) adds = malloc(nadds * sizeof(*adds));
+    types = malloc(ntypes * sizeof(*types));
+
+    err = MPI_Type_get_contents(inner_vector_copy,
+				nints,
+				nadds,
+				ntypes,
+				ints,
+				adds,
+				types);
+
+    if (ints[0] != 2) errs++;
+    if (ints[1] != 1) errs++;
+    if (ints[2] != 2) errs++;
+
+    if (verbose) {
+	if (ints[0] != 2) fprintf(stderr, 
+				  "inner vector count = %d; should be 2\n",
+				  ints[0]);
+	if (ints[1] != 1) fprintf(stderr,
+				  "inner vector blocklength = %d; should be 1\n",
+				  ints[1]);
+	if (ints[2] != 2) fprintf(stderr, 
+				  "inner vector stride = %d; should be 2\n",
+				  ints[2]);
+    }
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    free(ints);
+    if (nadds) free(adds);
+    free(types);
+
+    MPI_Type_free( &inner_vector_copy );
+    MPI_Type_free( &inner_vector );
+    MPI_Type_free( &outer_vector );
+
+    return 0;
+}
+
+/* optimizable_vector_of_basics_test()
+ *
+ * Builds a vector of ints.  Count is 10, blocksize is 2, stride is 2, so this
+ * is equivalent to a contig of 20.  But remember...we should get back our
+ * suboptimal values under MPI-2.
+ *
+ * Returns the number of errors encountered.
+ */
+int optimizable_vector_of_basics_test(void)
+{
+    MPI_Datatype parent_type;
+
+    int nints, nadds, ntypes, combiner, *ints;
+    MPI_Aint *adds = NULL;
+    MPI_Datatype *types;
+
+    int err, errs = 0;
+
+    /* set up type */
+    err = MPI_Type_vector(10,
+			  2,
+			  2,
+			  MPI_INT,
+			  &parent_type);
+
+    /* decode */
+    err = MPI_Type_get_envelope(parent_type,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+
+    if (nints != 3) errs++;
+    if (nadds != 0) errs++;
+    if (ntypes != 1) errs++;
+    if (combiner != MPI_COMBINER_VECTOR) errs++;
+
+    if (verbose) {
+        if (nints != 3) fprintf(stderr, "nints = %d; should be 3\n", nints);
+	if (nadds != 0) fprintf(stderr, "nadds = %d; should be 0\n", nadds);
+	if (ntypes != 1) fprintf(stderr, "ntypes = %d; should be 1\n", ntypes);
+	if (combiner != MPI_COMBINER_VECTOR)
+	    fprintf(stderr, "combiner = %s; should be vector\n",
+		    combiner_to_string(combiner));
+    }
+
+    ints = malloc(nints * sizeof(*ints));
+    if (nadds) adds = malloc(nadds * sizeof(*adds));
+    types = malloc(ntypes *sizeof(*types));
+
+    err = MPI_Type_get_contents(parent_type,
+				nints,
+				nadds,
+				ntypes,
+				ints,
+				adds,
+				types);
+
+    if (ints[0] != 10) errs++;
+    if (ints[1] != 2) errs++;
+    if (ints[2] != 2) errs++;
+    if (types[0] != MPI_INT) errs++;
+
+    if (verbose) {
+	if (ints[0] != 10) fprintf(stderr, "count = %d; should be 10\n",
+				   ints[0]);
+	if (ints[1] != 2) fprintf(stderr, "blocklength = %d; should be 2\n",
+				  ints[1]);
+	if (ints[2] != 2) fprintf(stderr, "stride = %d; should be 2\n",
+				  ints[2]);
+	if (types[0] != MPI_INT) fprintf(stderr, "type is not MPI_INT\n");
+    }
+
+    free(ints);
+    if (nadds) free(adds);
+    free(types);
+
+    MPI_Type_free( &parent_type );
+
+    return errs;
+}
+
+
+/* indexed_of_basics_test(void)
+ *
+ * Simple indexed type.
+ *
+ * Returns number of errors encountered.
+ */
+int indexed_of_basics_test(void)
+{
+    MPI_Datatype parent_type;
+    int s_count = 3, s_blocklengths[3] = { 3, 2, 1 };
+    int s_displacements[3] = { 10, 20, 30 };
+
+    int nints, nadds, ntypes, combiner, *ints;
+    MPI_Aint *adds = NULL;
+    MPI_Datatype *types;
+
+    int err, errs = 0;
+
+    /* set up type */
+    err = MPI_Type_indexed(s_count,
+			   s_blocklengths,
+			   s_displacements,
+			   MPI_INT,
+			   &parent_type);
+
+    /* decode */
+    err = MPI_Type_get_envelope(parent_type,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+
+    if (nints != 7) errs++;
+    if (nadds != 0) errs++;
+    if (ntypes != 1) errs++;
+    if (combiner != MPI_COMBINER_INDEXED) errs++;
+
+    if (verbose) {
+        if (nints != 7) fprintf(stderr, "nints = %d; should be 7\n", nints);
+	if (nadds != 0) fprintf(stderr, "nadds = %d; should be 0\n", nadds);
+	if (ntypes != 1) fprintf(stderr, "ntypes = %d; should be 1\n", ntypes);
+	if (combiner != MPI_COMBINER_INDEXED)
+	    fprintf(stderr, "combiner = %s; should be indexed\n",
+		    combiner_to_string(combiner));
+    }
+
+    ints = malloc(nints * sizeof(*ints));
+    if (nadds) adds = malloc(nadds * sizeof(*adds));
+    types = malloc(ntypes *sizeof(*types));
+
+    err = MPI_Type_get_contents(parent_type,
+				nints,
+				nadds,
+				ntypes,
+				ints,
+				adds,
+				types);
+
+    if (ints[0] != s_count) errs++;
+    if (ints[1] != s_blocklengths[0]) errs++;
+    if (ints[2] != s_blocklengths[1]) errs++;
+    if (ints[3] != s_blocklengths[2]) errs++;
+    if (ints[4] != s_displacements[0]) errs++;
+    if (ints[5] != s_displacements[1]) errs++;
+    if (ints[6] != s_displacements[2]) errs++;
+    if (types[0] != MPI_INT) errs++;
+
+    if (verbose) {
+	if (ints[0] != s_count) 
+	    fprintf(stderr, "count = %d; should be %d\n", ints[0], s_count);
+	if (ints[1] != s_blocklengths[0]) 
+	    fprintf(stderr, "blocklength[0] = %d; should be %d\n", ints[1], s_blocklengths[0]);
+	if (ints[2] != s_blocklengths[1]) 
+	    fprintf(stderr, "blocklength[1] = %d; should be %d\n", ints[2], s_blocklengths[1]);
+	if (ints[3] != s_blocklengths[2]) 
+	    fprintf(stderr, "blocklength[2] = %d; should be %d\n", ints[3], s_blocklengths[2]);
+	if (ints[4] != s_displacements[0]) 
+	    fprintf(stderr, "displacement[0] = %d; should be %d\n", ints[4], s_displacements[0]);
+	if (ints[5] != s_displacements[1]) 
+	    fprintf(stderr, "displacement[1] = %d; should be %d\n", ints[5], s_displacements[1]);
+	if (ints[6] != s_displacements[2]) 
+	    fprintf(stderr, "displacement[2] = %d; should be %d\n", ints[6], s_displacements[2]);
+	if (types[0] != MPI_INT) fprintf(stderr, "type[0] does not match\n");
+    }
+
+    free(ints);
+    if (nadds) free(adds);
+    free(types);
+
+    MPI_Type_free( &parent_type );
+    return errs;
+}
+
+/* indexed_of_vectors_test()
+ *
+ * Builds an indexed type of vectors of ints.
+ *
+ * Returns the number of errors encountered.
+ */
+int indexed_of_vectors_test(void)
+{
+    MPI_Datatype inner_vector, inner_vector_copy;
+    MPI_Datatype outer_indexed;
+    
+    int i_count = 3, i_blocklengths[3] = { 3, 2, 1 };
+    int i_displacements[3] = { 10, 20, 30 };
+
+    int nints, nadds, ntypes, combiner, *ints;
+    MPI_Aint *adds = NULL;
+    MPI_Datatype *types;
+
+    int err, errs = 0;
+
+    /* set up type */
+    err = MPI_Type_vector(2,
+			  1,
+			  2,
+			  MPI_INT,
+			  &inner_vector);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    err = MPI_Type_indexed(i_count,
+			   i_blocklengths,
+			   i_displacements,
+			   inner_vector,
+			   &outer_indexed);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    /* decode outer vector (get envelope, then contents) */
+    err = MPI_Type_get_envelope(outer_indexed,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    if (nints != 7) errs++;
+    if (nadds != 0) errs++;
+    if (ntypes != 1) errs++;
+    if (combiner != MPI_COMBINER_INDEXED) errs++;
+
+    if (verbose) {
+        if (nints != 7) fprintf(stderr, "nints = %d; should be 7\n", nints);
+	if (nadds != 0) fprintf(stderr, "nadds = %d; should be 0\n", nadds);
+	if (ntypes != 1) fprintf(stderr, "ntypes = %d; should be 1\n", ntypes);
+	if (combiner != MPI_COMBINER_INDEXED)
+	    fprintf(stderr, "combiner = %s; should be indexed\n",
+		    combiner_to_string(combiner));
+    }
+
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    ints = malloc(nints * sizeof(*ints));
+    if (nadds) adds = malloc(nadds * sizeof(*adds));
+    types = malloc(ntypes * sizeof(*types));
+
+    /* get contents of outer vector */
+    err = MPI_Type_get_contents(outer_indexed,
+				nints,
+				nadds,
+				ntypes,
+				ints,
+				adds,
+				types);
+
+    if (ints[0] != i_count) errs++;
+    if (ints[1] != i_blocklengths[0]) errs++;
+    if (ints[2] != i_blocklengths[1]) errs++;
+    if (ints[3] != i_blocklengths[2]) errs++;
+    if (ints[4] != i_displacements[0]) errs++;
+    if (ints[5] != i_displacements[1]) errs++;
+    if (ints[6] != i_displacements[2]) errs++;
+
+    if (verbose) {
+	if (ints[0] != i_count) 
+	    fprintf(stderr, "count = %d; should be %d\n", ints[0], i_count);
+	if (ints[1] != i_blocklengths[0]) 
+	    fprintf(stderr, "blocklength[0] = %d; should be %d\n", ints[1], i_blocklengths[0]);
+	if (ints[2] != i_blocklengths[1]) 
+	    fprintf(stderr, "blocklength[1] = %d; should be %d\n", ints[2], i_blocklengths[1]);
+	if (ints[3] != i_blocklengths[2]) 
+	    fprintf(stderr, "blocklength[2] = %d; should be %d\n", ints[3], i_blocklengths[2]);
+	if (ints[4] != i_displacements[0]) 
+	    fprintf(stderr, "displacement[0] = %d; should be %d\n", ints[4], i_displacements[0]);
+	if (ints[5] != i_displacements[1]) 
+	    fprintf(stderr, "displacement[1] = %d; should be %d\n", ints[5], i_displacements[1]);
+	if (ints[6] != i_displacements[2]) 
+	    fprintf(stderr, "displacement[2] = %d; should be %d\n", ints[6], i_displacements[2]);
+    }
+
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    inner_vector_copy = types[0];
+    free(ints);
+    if (nadds) free(adds);
+    free(types);
+
+    /* decode inner vector */
+    err = MPI_Type_get_envelope(inner_vector_copy,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+    if (err != MPI_SUCCESS) {
+	if (verbose) fprintf(stderr, 
+			     "error in MPI call; aborting after %d errors\n",
+			     errs+1);
+	return errs+1;
+    }
+
+    if (nints != 3) errs++;
+    if (nadds != 0) errs++;
+    if (ntypes != 1) errs++;
+    if (combiner != MPI_COMBINER_VECTOR) errs++;
+
+    if (verbose) {
+	if (nints != 3) fprintf(stderr, 
+				"inner vector nints = %d; should be 3\n",
+				nints);
+	if (nadds != 0) fprintf(stderr, 
+				"inner vector nadds = %d; should be 0\n",
+				nadds);
+	if (ntypes != 1) fprintf(stderr, 
+				 "inner vector ntypes = %d; should be 1\n",
+				 ntypes);
+	if (combiner != MPI_COMBINER_VECTOR)
+	    fprintf(stderr, "inner vector combiner = %s; should be vector\n",
+		    combiner_to_string(combiner));
+    }
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    ints = malloc(nints * sizeof(*ints));
+    if (nadds) adds = malloc(nadds * sizeof(*adds));
+    types = malloc(ntypes * sizeof(*types));
+
+    err = MPI_Type_get_contents(inner_vector_copy,
+				nints,
+				nadds,
+				ntypes,
+				ints,
+				adds,
+				types);
+
+    if (ints[0] != 2) errs++;
+    if (ints[1] != 1) errs++;
+    if (ints[2] != 2) errs++;
+
+    if (verbose) {
+	if (ints[0] != 2) fprintf(stderr, 
+				  "inner vector count = %d; should be 2\n",
+				  ints[0]);
+	if (ints[1] != 1) fprintf(stderr,
+				  "inner vector blocklength = %d; should be 1\n",
+				  ints[1]);
+	if (ints[2] != 2) fprintf(stderr, 
+				  "inner vector stride = %d; should be 2\n",
+				  ints[2]);
+    }
+    if (errs) {
+	if (verbose) fprintf(stderr, "aborting after %d errors\n", errs);
+	return errs;
+    }
+
+    free(ints);
+    if (nadds) free(adds);
+    free(types);
+
+    MPI_Type_free( &inner_vector_copy );
+    MPI_Type_free( &inner_vector );
+    MPI_Type_free( &outer_indexed );
+
+    return 0;
+}
+
+
+#ifdef HAVE_MPI_TYPE_CREATE_STRUCT
+/* struct_of_basics_test(void)
+ *
+ * There's nothing simple about structs :).  Although this is an easy one.
+ *
+ * Returns number of errors encountered.
+ *
+ * NOT TESTED.
+ */
+int struct_of_basics_test(void)
+{
+    MPI_Datatype parent_type;
+    int s_count = 3, s_blocklengths[3] = { 3, 2, 1 };
+    MPI_Aint s_displacements[3] = { 10, 20, 30 };
+    MPI_Datatype s_types[3] = { MPI_CHAR, MPI_INT, MPI_FLOAT };
+
+    int nints, nadds, ntypes, combiner, *ints;
+    MPI_Aint *adds = NULL;
+    MPI_Datatype *types;
+
+    int err, errs = 0;
+
+    /* set up type */
+    err = MPI_Type_create_struct(s_count,
+				 s_blocklengths,
+				 s_displacements,
+				 s_types,
+				 &parent_type);
+
+    /* decode */
+    err = MPI_Type_get_envelope(parent_type,
+				&nints,
+				&nadds,
+				&ntypes,
+				&combiner);
+
+    if (nints != 4) errs++;
+    if (nadds != 3) errs++;
+    if (ntypes != 3) errs++;
+    if (combiner != MPI_COMBINER_STRUCT) errs++;
+
+    if (verbose) {
+        if (nints != 4) fprintf(stderr, "nints = %d; should be 3\n", nints);
+	if (nadds != 3) fprintf(stderr, "nadds = %d; should be 0\n", nadds);
+	if (ntypes != 3) fprintf(stderr, "ntypes = %d; should be 3\n", ntypes);
+	if (combiner != MPI_COMBINER_STRUCT)
+	    fprintf(stderr, "combiner = %s; should be struct\n",
+		    combiner_to_string(combiner));
+    }
+
+    ints = malloc(nints * sizeof(*ints));
+    adds = malloc(nadds * sizeof(*adds));
+    types = malloc(ntypes *sizeof(*types));
+
+    err = MPI_Type_get_contents(parent_type,
+				nints,
+				nadds,
+				ntypes,
+				ints,
+				adds,
+				types);
+
+    if (ints[0] != s_count) errs++;
+    if (ints[1] != s_blocklengths[0]) errs++;
+    if (ints[2] != s_blocklengths[1]) errs++;
+    if (ints[3] != s_blocklengths[2]) errs++;
+    if (adds[0] != s_displacements[0]) errs++;
+    if (adds[1] != s_displacements[1]) errs++;
+    if (adds[2] != s_displacements[2]) errs++;
+    if (types[0] != s_types[0]) errs++;
+    if (types[1] != s_types[1]) errs++;
+    if (types[2] != s_types[2]) errs++;
+
+    if (verbose) {
+	if (ints[0] != s_count) 
+	    fprintf(stderr, "count = %d; should be %d\n", ints[0], s_count);
+	if (ints[1] != s_blocklengths[0])
+	    fprintf(stderr, "blocklength[0] = %d; should be %d\n", ints[1], s_blocklengths[0]);
+	if (ints[2] != s_blocklengths[1]) 
+	    fprintf(stderr, "blocklength[1] = %d; should be %d\n", ints[2], s_blocklengths[1]);
+	if (ints[3] != s_blocklengths[2]) 
+	    fprintf(stderr, "blocklength[2] = %d; should be %d\n", ints[3], s_blocklengths[2]);
+	if (adds[0] != s_displacements[0]) 
+	    fprintf(stderr, "displacement[0] = %d; should be %d\n", adds[0], s_displacements[0]);
+	if (adds[1] != s_displacements[1]) 
+	    fprintf(stderr, "displacement[1] = %d; should be %d\n", adds[1], s_displacements[1]);
+	if (adds[2] != s_displacements[2]) 
+	    fprintf(stderr, "displacement[2] = %d; should be %d\n", adds[2], s_displacements[2]);
+	if (types[0] != s_types[0]) 
+	    fprintf(stderr, "type[0] does not match\n");
+	if (types[1] != s_types[1]) 
+	    fprintf(stderr, "type[1] does not match\n");
+	if (types[2] != s_types[2]) 
+	    fprintf(stderr, "type[2] does not match\n");
+    }
+
+    free(ints);
+    free(adds);
+    free(types);
+
+    MPI_Type_free( &parent_type );
+
+    return errs;
+}
+#endif
+
+/* combiner_to_string(combiner)
+ *
+ * Converts a numeric combiner into a pointer to a string used for printing.
+ */
+char *combiner_to_string(int combiner)
+{
+    static char c_named[]    = "named";
+    static char c_contig[]   = "contig";
+    static char c_vector[]   = "vector";
+    static char c_hvector[]  = "hvector";
+    static char c_indexed[]  = "indexed";
+    static char c_hindexed[] = "hindexed";
+    static char c_struct[]   = "struct";
+#ifdef HAVE_MPI2_COMBINERS
+    static char c_dup[]              = "dup";
+    static char c_hvector_integer[]  = "hvector_integer";
+    static char c_hindexed_integer[] = "hindexed_integer";
+    static char c_indexed_block[]    = "indexed_block";
+    static char c_struct_integer[]   = "struct_integer";
+    static char c_subarray[]         = "subarray";
+    static char c_darray[]           = "darray";
+    static char c_f90_real[]         = "f90_real";
+    static char c_f90_complex[]      = "f90_complex";
+    static char c_f90_integer[]      = "f90_integer";
+    static char c_resized[]          = "resized";
+#endif
+
+    if (combiner == MPI_COMBINER_NAMED)      return c_named;
+    if (combiner == MPI_COMBINER_CONTIGUOUS) return c_contig;
+    if (combiner == MPI_COMBINER_VECTOR)     return c_vector;
+    if (combiner == MPI_COMBINER_HVECTOR)    return c_hvector;
+    if (combiner == MPI_COMBINER_INDEXED)    return c_indexed;
+    if (combiner == MPI_COMBINER_HINDEXED)   return c_hindexed;
+    if (combiner == MPI_COMBINER_STRUCT)     return c_struct;
+#ifdef HAVE_MPI2_COMBINERS
+    if (combiner == MPI_COMBINER_DUP)              return c_dup;
+    if (combiner == MPI_COMBINER_HVECTOR_INTEGER)  return c_hvector_integer;
+    if (combiner == MPI_COMBINER_HINDEXED_INTEGER) return c_hindexed_integer;
+    if (combiner == MPI_COMBINER_INDEXED_BLOCK)    return c_indexed_block;
+    if (combiner == MPI_COMBINER_STRUCT_INTEGER)   return c_struct_integer;
+    if (combiner == MPI_COMBINER_SUBARRAY)         return c_subarray;
+    if (combiner == MPI_COMBINER_DARRAY)           return c_darray;
+    if (combiner == MPI_COMBINER_F90_REAL)         return c_f90_real;
+    if (combiner == MPI_COMBINER_F90_COMPLEX)      return c_f90_complex;
+    if (combiner == MPI_COMBINER_F90_INTEGER)      return c_f90_integer;
+    if (combiner == MPI_COMBINER_RESIZED)          return c_resized;
+#endif
+    
+    return NULL;
+}
+
+int parse_args(int argc, char **argv)
+{
+#ifdef HAVE_GET_OPT
+    int ret;
+
+    while ((ret = getopt(argc, argv, "v")) >= 0)
+    {
+	switch (ret) {
+	    case 'v':
+		verbose = 1;
+		break;
+	}
+    }
+#else
+#endif
+    return 0;
+}
+