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35f68a733c
This reworks structs.py's internal dwarf-info parser to be a bit more
flexible. The eventual plan is to adopt this parser in other scripts.
The main difference is we now parse the dwarf-info into a full tree,
with optional filtering, before extracting the fields we care about.
This is both more flexible and gives us more confidence the parser is
not misparsing something.
(Unrelated but apparently misparsing is a real word.)
This also extends structs.py to include field info for structs and
unions. This is quite useful for understanding the size of things:
$ ./scripts/structs.py thumb/lfs.o -Dstruct=lfsr_bptr_t -z
struct size
lfsr_bptr_t 20
|-> cksize 4
|-> cksum 4
'-> data 12
|-> size 4
'-> u 8
|-> buffer 4
'-> disk 8
|-> block 4
'-> off 4
TOTAL 20
The field info uses the same -z/--depth flag from stack.py/perf.py/
perbd.py, however the cycle detector needed a bit of tweaking. Detecting
cycles purely by name doesn't quite work with structs:
file->o.o.flags
^ |
'-' not a cycle!
Unfortunately, we do lose the field order in structs. But this info is
still useful.
Oh, we also prefer typedef names over struct/union names now. These are
a bit easier to read since they are more common in the codebase.