Easy way to get type info out of STABS?

Easy way to get type info out of STABS?

[Justin McCann]

I'm looking for an easy-to-use API to get the type
information out of a Sparc ELF-32 executable with full
debugging symbols. I've read through all of the STABS
documentation I could find, as well as the GDB and
libbfd docs and source code; I've also looked at Sun's
gelf and libelf. 

I could write my own STABS parser, but I'm lazy and
believe in code reuse. I figure there has to be one
that isn't totally dependent on four dozen other
include files. Anyone have any suggestions?

What I'm aiming for is something that I can use to
make an API along the lines of:
  char *lookupfieldname(typenumber, offset)

So, given the type of a variable and an offset to a
field within that variable (some arbitrary nesting
deep) I need to determine what the field name is that
corresponds to that offset.

For example:
  struct {
     int a;
     struct {
           int b;
           int q;
     } foo;
  } myvar;

For the address &(myvar) + 8, I'd like to be able to
say that it is "myvar.foo.q".

Anyone know of a library that has all the info in an
easy-enough place to put that together?

Thanks in advance,
   Justin



		
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Re: Easy way to get type info out of STABS?

[Ian Lance Taylor]

Justin McCann <jneilm@yahoo.com> writes:

> I'm looking for an easy-to-use API to get the type
> information out of a Sparc ELF-32 executable with full
> debugging symbols. I've read through all of the STABS
> documentation I could find, as well as the GDB and
> libbfd docs and source code; I've also looked at Sun's
> gelf and libelf. 

Look at the debugging library which objdump and objcopy use.  The
interface is binutils/debug.h.  Look at read_debugging_info in
binutils/rddbg.c to get debugging information for a file.  Then call,
e.g., debug_find_tagged_type to get the struct you want, call
debug_get_fields to get the fields, and call debug_get_field_bitpos on
each field to get the bit position within the struct.

Ian