On October 2, 2014 8:21:51 PM CEST, Aldy Hernandez <[email protected]> wrote:
>On 10/02/14 08:46, Jason Merrill wrote:
>> On 10/01/2014 05:31 PM, Aldy Hernandez wrote:
>>> + for (tree t = level->names; t; t = TREE_CHAIN(t))
>>> + if (TREE_CODE (t) != TYPE_DECL
>>> + && TREE_CODE (t) != PARM_DECL
>>> + && !DECL_IS_BUILTIN (t))
>>> + debug_hooks->early_global_decl (t);
>>
>> What does this do for templates? I think we don't want to send a
>> template off to early_global_decl, but rather walk through its
>> specializations and emit them.
>
>Hmm, I'll look into this.
>
>> Why do you need to check for PARM_DECL? There shouldn't be any
>> PARM_DECL at namespace scope.
>>
>> Why do you want to skip TYPE_DECL? I think we should leave the
>decision
>> about whether to emit a typedef to the debugging back end.
>
>Actually, I think we/I need to rethink this whole globals thing.
>Currently we're early dumping global *_DECLs, and hoping dwarf2out
>recursion will also pick up types and any derivatives from the *_DECLs,
>
>but taking a closer look I've noticed a lot of things are not being
>dumped early.
>
>For instance:
>
>
> foo()
> {
> typedef int ITYPE;
> ITYPE var = 5;
> }
>
>For the above code, var's DIE gets outputted _after_ the compilation
>proper has been run here:
>
>if (! declaration && outer_scope && TREE_CODE (outer_scope) !=
>ERROR_MARK
> && (!DECL_STRUCT_FUNCTION (decl)
> || DECL_STRUCT_FUNCTION (decl)->gimple_df))
> ...
> ...
> decls_for_scope (outer_scope, subr_die, 0);
>
>I think we should be outputting DIEs for locals at the end of parsing,
Yes we should.
>so my patch going through level->names IMO is wrong. We should be
>dumping all *_DECLs created by the FE, not just globally scoped ones.
>
>This means that we'll need to clean up unreachable/unused DIEs after
>the
>flow graph has been built.
If they are there after parsing a debugger should see them. Even if it just
prints <optimized out>.
>Another example currently not being dumped early is...
>
> function()
> {
> class Local {
> public:
> void loc_foo (void) { }
> };
>
> Local l;
> l.loc_foo ();
> }
>
>...since loc_foo() is not in level->names. Again, this seems like an
>argument for early dumping all *_DECLs directly from
>rest_of_decl_compilation() (as you've hinted) and then cleaning up
>unused DIEs after we have flow information.
>
>Does this seem reasonable?
Yes, but I don't see why we need the cleanup step. The decls are real after all.
Richard.
>Aldy
