+/* Check OpenMP nesting restrictions. */
+static void
+check_omp_nesting_restrictions (tree t, omp_context *ctx)
+{
+ switch (TREE_CODE (t))
+ {
+ case OMP_FOR:
+ case OMP_SECTIONS:
+ case OMP_SINGLE:
+ for (; ctx != NULL; ctx = ctx->outer)
+ switch (TREE_CODE (ctx->stmt))
+ {
+ case OMP_FOR:
+ case OMP_SECTIONS:
+ case OMP_SINGLE:
+ case OMP_ORDERED:
+ case OMP_MASTER:
+ warning (0, "work-sharing region may not be closely nested inside "
+ "of work-sharing, critical, ordered or master region");
+ return;
+ case OMP_PARALLEL:
+ return;
+ default:
+ break;
+ }
+ break;
+ case OMP_MASTER:
+ for (; ctx != NULL; ctx = ctx->outer)
+ switch (TREE_CODE (ctx->stmt))
+ {
+ case OMP_FOR:
+ case OMP_SECTIONS:
+ case OMP_SINGLE:
+ warning (0, "master region may not be closely nested inside "
+ "of work-sharing region");
+ return;
+ case OMP_PARALLEL:
+ return;
+ default:
+ break;
+ }
+ break;
+ case OMP_ORDERED:
+ for (; ctx != NULL; ctx = ctx->outer)
+ switch (TREE_CODE (ctx->stmt))
+ {
+ case OMP_CRITICAL:
+ warning (0, "ordered region may not be closely nested inside "
+ "of critical region");
+ return;
+ case OMP_FOR:
+ if (find_omp_clause (OMP_CLAUSES (ctx->stmt),
+ OMP_CLAUSE_ORDERED) == NULL)
+ warning (0, "ordered region must be closely nested inside "
+ "a loop region with an ordered clause");
+ return;
+ case OMP_PARALLEL:
+ return;
+ default:
+ break;
+ }
+ break;
+ case OMP_CRITICAL:
+ for (; ctx != NULL; ctx = ctx->outer)
+ if (TREE_CODE (ctx->stmt) == OMP_CRITICAL
+ && OMP_CRITICAL_NAME (t) == OMP_CRITICAL_NAME (ctx->stmt))
+ {
+ warning (0, "critical region may not be nested inside a critical "
+ "region with the same name");
+ return;
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+