question: private void aboutToProcess ( int address , int reg ) { boolean first = ( endIndices == null ) ; if ( ( address == lastAddress ) && ! first ) { return ; } if ( address < lastAddress ) { throw new RuntimeException ( "shouldn't happen" ) ; } if ( first || ( reg >= endIndices . length ) ) { int newSz = reg + 1 ; RegisterSpecSet newRegs = new RegisterSpecSet ( newSz ) ; int [ ] newEnds = new int [ newSz ] ; Arrays . fill ( newEnds , - 1 ) ; if ( ! first ) { newRegs . putAll ( regs ) ; System . arraycopy ( endIndices , 0 , newEnds , 0 , endIndices . length ) ; } regs = newRegs ; endIndices = newEnds ; } }
target:  Checks the address and other vitals as a prerequisite to further processing.