Help needed in output relocations

Help needed in output relocations

[Rishi Raj]

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Hello,
I have almost completed the output of relocation entries. The only thing
that remains is to output the corresponding symbols in .symtab. In my
current design, I store the info about relocation entry and the symbol
name. However, the problem I am facing with this approach is that many
relocation entries will have the same name, so we will need a hash table
with the key as symbol name and value as symbol index in symtab. It would
be really helpful if you could point out the relevant docs or help me
figure out how to use the hash table in GCC.
Another approach is, as we have only 4-5 unique relocation symbol names. We
can output just those and store their .symtab index somewhere.

--
Rishi

Re: Help needed in output relocations

[Jan Hubicka]

> Hello,
Hi,
> I have almost completed the output of relocation entries. The only thing
> that remains is to output the corresponding symbols in .symtab. In my
> current design, I store the info about relocation entry and the symbol
> name. However, the problem I am facing with this approach is that many
> relocation entries will have the same name, so we will need a hash table
> with the key as symbol name and value as symbol index in symtab. It would
> be really helpful if you could point out the relevant docs or help me
> figure out how to use the hash table in GCC.
> Another approach is, as we have only 4-5 unique relocation symbol names. We
> can output just those and store their .symtab index somewhere.

I am not 100% sure what precisely you need, but if you need just
hashtable translating strings to integers, you can probably just
follow section_name_hash in symtab.cc which is doing pretty much
the same.

In case you can already rely on the fact that the strings are unified
(which is the case for GCC's identifiers) you can also simply use
hash_map<tree,unsigned_int> which has bit easier to set up.

Honza
> 
> --
> Rishi