940 // No action needed.
941 return;
942 }
943 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
944 NOT_PRODUCT(if (ex_type==nullptr) tty->print_cr("*** Exception not InstPtr"));
945 if (ex_type == nullptr)
946 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
947
948 // determine potential exception handlers
949 ciExceptionHandlerStream handlers(method(), bci(),
950 ex_type->instance_klass(),
951 ex_type->klass_is_exact());
952
953 // Start executing from the given throw state. (Keep its stack, for now.)
954 // Get the exception oop as known at compile time.
955 ex_node = use_exception_state(ex_map);
956
957 // Get the exception oop klass from its header
958 Node* ex_klass_node = nullptr;
959 if (has_exception_handler() && !ex_type->klass_is_exact()) {
960 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
961 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
962
963 // Compute the exception klass a little more cleverly.
964 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
965 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
966 // each arm of the Phi. If I know something clever about the exceptions
967 // I'm loading the class from, I can replace the LoadKlass with the
968 // klass constant for the exception oop.
969 if (ex_node->is_Phi()) {
970 ex_klass_node = new PhiNode(ex_node->in(0), TypeInstKlassPtr::OBJECT);
971 for (uint i = 1; i < ex_node->req(); i++) {
972 Node* ex_in = ex_node->in(i);
973 if (ex_in == top() || ex_in == nullptr) {
974 // This path was not taken.
975 ex_klass_node->init_req(i, top());
976 continue;
977 }
978 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
979 Node* k = _gvn.transform(LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
980 ex_klass_node->init_req( i, k );
981 }
982 ex_klass_node = _gvn.transform(ex_klass_node);
983 }
984 }
985
986 // Scan the exception table for applicable handlers.
987 // If none, we can call rethrow() and be done!
988 // If precise (loaded with no subklasses), insert a D.S. style
989 // pointer compare to the correct handler and loop back.
990 // If imprecise, switch to the Rethrow VM-call style handling.
991
992 int remaining = handlers.count_remaining();
993
994 // iterate through all entries sequentially
995 for (;!handlers.is_done(); handlers.next()) {
996 ciExceptionHandler* handler = handlers.handler();
997
998 if (handler->is_rethrow()) {
999 // If we fell off the end of the table without finding an imprecise
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940 // No action needed.
941 return;
942 }
943 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
944 NOT_PRODUCT(if (ex_type==nullptr) tty->print_cr("*** Exception not InstPtr"));
945 if (ex_type == nullptr)
946 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
947
948 // determine potential exception handlers
949 ciExceptionHandlerStream handlers(method(), bci(),
950 ex_type->instance_klass(),
951 ex_type->klass_is_exact());
952
953 // Start executing from the given throw state. (Keep its stack, for now.)
954 // Get the exception oop as known at compile time.
955 ex_node = use_exception_state(ex_map);
956
957 // Get the exception oop klass from its header
958 Node* ex_klass_node = nullptr;
959 if (has_exception_handler() && !ex_type->klass_is_exact()) {
960 Node* p = basic_plus_adr( ex_node, ex_node, Type::klass_offset());
961 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
962
963 // Compute the exception klass a little more cleverly.
964 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
965 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
966 // each arm of the Phi. If I know something clever about the exceptions
967 // I'm loading the class from, I can replace the LoadKlass with the
968 // klass constant for the exception oop.
969 if (ex_node->is_Phi()) {
970 ex_klass_node = new PhiNode(ex_node->in(0), TypeInstKlassPtr::OBJECT);
971 for (uint i = 1; i < ex_node->req(); i++) {
972 Node* ex_in = ex_node->in(i);
973 if (ex_in == top() || ex_in == nullptr) {
974 // This path was not taken.
975 ex_klass_node->init_req(i, top());
976 continue;
977 }
978 Node* p = basic_plus_adr(ex_in, ex_in, Type::klass_offset());
979 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
980 ex_klass_node->init_req( i, k );
981 }
982 ex_klass_node = _gvn.transform(ex_klass_node);
983 }
984 }
985
986 // Scan the exception table for applicable handlers.
987 // If none, we can call rethrow() and be done!
988 // If precise (loaded with no subklasses), insert a D.S. style
989 // pointer compare to the correct handler and loop back.
990 // If imprecise, switch to the Rethrow VM-call style handling.
991
992 int remaining = handlers.count_remaining();
993
994 // iterate through all entries sequentially
995 for (;!handlers.is_done(); handlers.next()) {
996 ciExceptionHandler* handler = handlers.handler();
997
998 if (handler->is_rethrow()) {
999 // If we fell off the end of the table without finding an imprecise
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