[LLVMdev] llvm-dwarfdump offsets

[David Blaikie]

llvm-dwarfdump currently outputs the offset of each DIE relative to the
entire debug_info section. But type/DIE references within a unit are
relative to that unit.

Should we emit unit-relative offsets instead?

I've prototyped this and end up with output something like this:

0x00000051:   DW_TAG_base_type [24]
                DW_AT_name [DW_FORM_strp]       ( .debug_str[0x00000051] =
"int")
                DW_AT_encoding [DW_FORM_data1]  (0x05)
                DW_AT_byte_size [DW_FORM_data1] (0x04)

0x00000058:   NULL
0x000001ec: Compile Unit: length = 0x0000002b version = 0x0004 abbr_offset
= 0x0000 addr_size = 0x08 (next unit at 0x0000021b)

0x0000000b: DW_TAG_type_unit [25] *
              DW_AT_language [DW_FORM_data2]    (0x0004)

0x0000000e:   DW_TAG_namespace [9] *

It is a bit weird using the same syntax to print the section relative
offest for the unit header, then unit-relative offsets for the DIEs, but
other than that this seems to me like a useful improvement.

(I was going to use this change to help me print out the unit-relative
offsets for types in type units to test pubnames + type units - obviously
in the end the type units will be in their own section and unit relative
and section relative will be synonymous again, but the change seems like
goodness regardless)

yes/no/maybe?
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