/*
static int checkCompatibility(ADIOS_QUERY* q)
{
if ((q->left != NULL) && (q->right != NULL)) {
return isCompatible(q->left, q->right);
}
return 0; // ok, no need to check
}
*/
static ADIOS_VARBLOCK * computePGBounds(ADIOS_QUERY *q, int wbindex, int timestep, int *out_ndim)
{
if (!q->left && !q->right) {
// In this case, we have reached a leaf query node, so directly
// retrieve the varblock from the varinfo
assert(q->varinfo);
// Read the blockinfo if not already present
if (!q->varinfo->blockinfo) {
adios_read_set_data_view(q->file, LOGICAL_DATA_VIEW);
common_read_inq_var_blockinfo(q->file, q->varinfo);
}
// Note: adios_get_absolute_writeblock_index ensures that timestep and wbindex
// are both in bounds, signalling an adios_error if not. However, there will be
// no variable name cited in the error, so perhaps better error handling would
// be desirable in the future
//const int abs_wbindex = adios_get_absolute_writeblock_index(q->varinfo, wbindex, timestep);
int abs_wbindex = wbindex;
if (q->varinfo->nsteps > 1) { // varinfo contains ALL timesteps, not just one step, so streaming mode files will not need call this func
abs_wbindex = adios_get_absolute_writeblock_index(q->varinfo, wbindex, timestep);
}
// Finally, return ndim and the varblock
*out_ndim = q->varinfo->ndim;
return &q->varinfo->blockinfo[abs_wbindex];
} else if (!q->left || !q->right) {
// In this case, we have only one subtree, so just return the
// ndim and varblock from that subtree directly, since there's
// nothing to compare against
ADIOS_QUERY *present_subtree = q->left ? (ADIOS_QUERY*)q->left : (ADIOS_QUERY*)q->right;
return computePGBounds(present_subtree, wbindex, timestep, out_ndim);
} else {
// In this final case, we have two subtrees, and we must compare
// the resultant varblock from each one to ensure they are equal
// before returning
ADIOS_QUERY *left = (ADIOS_QUERY *)q->left;
ADIOS_QUERY *right = (ADIOS_QUERY *)q->right;
// Next, retrieve the ndim and varblock for each subtree
int left_ndim, right_ndim;
ADIOS_VARBLOCK *left_vb = computePGBounds(left, wbindex, timestep, &left_ndim);
ADIOS_VARBLOCK *right_vb = computePGBounds(right, wbindex, timestep, &right_ndim);
// If either subtree returns an invalid (NULL) varblock, fail immediately
if (!left_vb || !right_vb) {
return NULL;
}
// Check that the ndims are equal, failing if not
int ndim;
if (left_ndim != right_ndim) {
return NULL;
} else {
ndim = left_ndim;
}
// Check the start/count coordinate in each dimension for equality,
// failing if any coordinate is not equal between the subtrees
int i;
for (i = 0; i < ndim; i++) {
if (left_vb->start[i] != right_vb->start[i] ||
left_vb->count[i] != right_vb->count[i]) {
return NULL;
}
}
// Finally, we have ensured that both subtrees yield valid and equal
// varblocks, so return the common ndim and varblock (arbitrarily use
// left_vb, since right and left equal)
*out_ndim = ndim;
return left_vb;
}
}
ADIOS_PG_INTERSECTIONS * adios_find_intersecting_pgs(const ADIOS_FILE *fp, int varid, const ADIOS_SELECTION *sel, const int from_step, const int nsteps) {
// Declares
adios_transform_read_request *new_reqgroup;
int blockidx, timestep, timestep_blockidx;
int curblocks, start_blockidx, end_blockidx;
int intersects;
ADIOS_VARBLOCK *raw_vb, *vb;
enum ADIOS_FLAG swap_endianness = (fp->endianness == get_system_endianness()) ? adios_flag_no : adios_flag_yes;
int to_steps = from_step + nsteps;
// As long as we don't free/destroy it, using the infocache from the file will have no effect on future
// operations using the file (except possibly speeding them up, so "constness" is still respected
adios_infocache *infocache = common_read_get_file_infocache((ADIOS_FILE*)fp);
ADIOS_PG_INTERSECTIONS *resulting_intersections = (ADIOS_PG_INTERSECTIONS *)calloc(1, sizeof(ADIOS_PG_INTERSECTIONS));
resulting_intersections->npg = 0;
int intersection_capacity = INITIAL_INTERSECTION_CAPACITY;
resulting_intersections->intersections = (ADIOS_PG_INTERSECTION *)calloc(intersection_capacity, sizeof(ADIOS_PG_INTERSECTION));
// Precondition checking
if (sel->type != ADIOS_SELECTION_BOUNDINGBOX &&
sel->type != ADIOS_SELECTION_POINTS) {
adios_error(err_operation_not_supported, "Only bounding box and point selections are currently supported during read on transformed variables.");
}
// Still respecting constness, since we're going to undo this
const data_view_t old_view = adios_read_set_data_view((ADIOS_FILE*)fp, LOGICAL_DATA_VIEW); // Temporarily go to logical data view
const ADIOS_VARINFO *varinfo = adios_infocache_inq_varinfo(fp, infocache, varid);
assert(from_step >= 0 && to_steps <= varinfo->nsteps);
// Compute the blockidx range, given the timesteps
compute_blockidx_range(varinfo, from_step, to_steps, &start_blockidx, &end_blockidx);
// Retrieve blockinfos, if they haven't been done retrieved
if (!varinfo->blockinfo)
common_read_inq_var_blockinfo(fp, (ADIOS_VARINFO *)varinfo);
// Undoing view set (returning to const state)
adios_read_set_data_view((ADIOS_FILE*)fp, old_view); // Reset the data view to whatever it was before
// Assemble read requests for each varblock
blockidx = start_blockidx;
timestep = from_step;
timestep_blockidx = 0;
while (blockidx != end_blockidx) { //for (blockidx = startblock_idx; blockidx != endblock_idx; blockidx++) {
ADIOS_SELECTION *pg_bounds_sel;
ADIOS_SELECTION *pg_intersection_sel;
vb = &varinfo->blockinfo[blockidx];
pg_bounds_sel = create_pg_bounds(varinfo->ndim, vb);
// Find the intersection, if any
pg_intersection_sel = adios_selection_intersect_global(pg_bounds_sel, sel);
if (pg_intersection_sel) {
// Expand the PG intersection array, if needed
if (resulting_intersections->npg == intersection_capacity) {
intersection_capacity *= 2;
resulting_intersections->intersections = (ADIOS_PG_INTERSECTION *)realloc(resulting_intersections->intersections, intersection_capacity * sizeof(ADIOS_PG_INTERSECTION));
if (!resulting_intersections->intersections) {
adios_error (err_no_memory, "Cannot allocate buffer for PG intersection results in adios_find_intersecting_pgs (required %llu bytes)\n", intersection_capacity * sizeof(ADIOS_PG_INTERSECTION));
return NULL;
}
}
ADIOS_PG_INTERSECTION *intersection = &resulting_intersections->intersections[resulting_intersections->npg];
intersection->timestep = timestep;
intersection->blockidx = blockidx;
intersection->blockidx_in_timestep = timestep_blockidx;
intersection->intersection_sel = pg_intersection_sel;
intersection->pg_bounds_sel = pg_bounds_sel;
resulting_intersections->npg++;
} else {
// Cleanup
common_read_selection_delete(pg_bounds_sel); // OK to delete, because this function only frees the outer struct, not the arrays within
}
// Increment block indexes
blockidx++;
timestep_blockidx++;
if (timestep_blockidx == varinfo->nblocks[timestep]) {
timestep_blockidx = 0;
timestep++;
}
}
return resulting_intersections;
}
