DWARF size overhead

I made today simple script to estimate size overhead due types duplication. This is hard task for C++ - bcs some types can have specialized (or partially specialized) template parameters and sure this types should be considered as different. But for plain C we can safely get all high-level types and assume that types with the same name and declared at the same line and column are equal

Next I ran this script on objdump -g dump for linux kernel. Script gave me digit 252741370

Lets find size of .debug_info section

objdump -h vmlinux | grep debug_info
 35 .debug_info   118205ec  0000000000000000  0000000000000000  03037230  2**0

Size is 0x118205ec = 293733868

And finally lets calculate share of unnecessary info: 252741370 /  293733868 = 0,8604

I am shocked - 86%!!! Looks like hd manufacturers conspiracy 

Update: for C++ I made another version of this script to support namespaces and got following results:

• cc1 from gcc 111858917 / 130272407 = 0,8587
• gdb 105034993 / 139899598 = 0,7508
• llvm-dwarfdump 194031570 / 263053224 = 0,7376