1087   RegisterMap map(thread(), true);
1088   frame caller_fr = stub_fr.sender(&map);
1089 
1090   // Should only be poll_return or poll
1091   assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" );
1092 
1093   // This is a poll immediately before a return. The exception handling code
1094   // has already had the effect of causing the return to occur, so the execution
1095   // will continue immediately after the call. In addition, the oopmap at the
1096   // return point does not mark the return value as an oop (if it is), so
1097   // it needs a handle here to be updated.
1098   if( nm->is_at_poll_return(real_return_addr) ) {
1099     // See if return type is an oop.
1100     bool return_oop = nm->method()->is_returning_oop();
1101     Handle return_value;
1102     if (return_oop) {
1103       // The oop result has been saved on the stack together with all
1104       // the other registers. In order to preserve it over GCs we need
1105       // to keep it in a handle.
1106       oop result = caller_fr.saved_oop_result(&map);
1107       assert(result == NULL || result->is_oop(), "must be oop");
1108       return_value = Handle(thread(), result);
1109       assert(Universe::heap()->is_in_or_null(result), "must be heap pointer");
1110     }
1111 
1112     // Block the thread
1113     SafepointSynchronize::block(thread());
1114 
1115     // restore oop result, if any
1116     if (return_oop) {
1117       caller_fr.set_saved_oop_result(&map, return_value());
1118     }
1119   }
1120 
1121   // This is a safepoint poll. Verify the return address and block.
1122   else {
1123     set_at_poll_safepoint(true);
1124 
1125     // verify the blob built the "return address" correctly
1126     assert(real_return_addr == caller_fr.pc(), "must match");
1127 

1087   RegisterMap map(thread(), true);
1088   frame caller_fr = stub_fr.sender(&map);
1089 
1090   // Should only be poll_return or poll
1091   assert( nm->is_at_poll_or_poll_return(real_return_addr), "should not be at call" );
1092 
1093   // This is a poll immediately before a return. The exception handling code
1094   // has already had the effect of causing the return to occur, so the execution
1095   // will continue immediately after the call. In addition, the oopmap at the
1096   // return point does not mark the return value as an oop (if it is), so
1097   // it needs a handle here to be updated.
1098   if( nm->is_at_poll_return(real_return_addr) ) {
1099     // See if return type is an oop.
1100     bool return_oop = nm->method()->is_returning_oop();
1101     Handle return_value;
1102     if (return_oop) {
1103       // The oop result has been saved on the stack together with all
1104       // the other registers. In order to preserve it over GCs we need
1105       // to keep it in a handle.
1106       oop result = caller_fr.saved_oop_result(&map);
1107       assert(result == NULL || oopDesc::is_oop(result), "must be oop");
1108       return_value = Handle(thread(), result);
1109       assert(Universe::heap()->is_in_or_null(result), "must be heap pointer");
1110     }
1111 
1112     // Block the thread
1113     SafepointSynchronize::block(thread());
1114 
1115     // restore oop result, if any
1116     if (return_oop) {
1117       caller_fr.set_saved_oop_result(&map, return_value());
1118     }
1119   }
1120 
1121   // This is a safepoint poll. Verify the return address and block.
1122   else {
1123     set_at_poll_safepoint(true);
1124 
1125     // verify the blob built the "return address" correctly
1126     assert(real_return_addr == caller_fr.pc(), "must match");
1127