Finally can dump out the parameter type from dwarf standard. Some parameter is store recursively, so need to read out DW_AT_type and get the right die and decode again. Personally I think dwarf is just too hard to parse.

Here is the code
https://sourceforge.net/p/peter-dwarf/code/254/tree//trunk/src/main/java/com/peterdwarf/dwarf/DwarfLib.java
https://sourceforge.net/p/peter-dwarf/code/254/tree//trunk/src/main/java/com/peterdwarf/dwarf/Dwarf.java