On Tue, Mar 19, 2024 at 6:56 AM Arnaldo Carvalho de Melo
<acme@xxxxxxxxxx> wrote:
>
> On Mon, Mar 18, 2024 at 10:50:56PM -0700, Namhyung Kim wrote:
> > The die_find_func_rettype() is to find a debug entry for the given
> > function name and sets the type information of the return value. By
> > convention, it'd return the pointer to the type die (should be the
> > same as the given mem_die argument) if found, or NULL otherwise.
> >
> > Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> > Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> > ---
> > tools/perf/util/dwarf-aux.c | 43 +++++++++++++++++++++++++++++++++++++
> > tools/perf/util/dwarf-aux.h | 4 ++++
> > 2 files changed, 47 insertions(+)
> >
> > diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
> > index cd9364d296b6..9080119a258c 100644
> > --- a/tools/perf/util/dwarf-aux.c
> > +++ b/tools/perf/util/dwarf-aux.c
> > @@ -696,6 +696,49 @@ Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
> > return die_mem;
> > }
> >
> > +static int __die_find_func_rettype_cb(Dwarf_Die *die_mem, void *data)
> > +{
> > + const char *func_name;
> > +
> > + if (dwarf_tag(die_mem) != DW_TAG_subprogram)
> > + return DIE_FIND_CB_SIBLING;
> > +
> > + func_name = dwarf_diename(die_mem);
> > + if (func_name && !strcmp(func_name, data))
> > + return DIE_FIND_CB_END;
> > +
> > + return DIE_FIND_CB_SIBLING;
> > +}
> > +
> > +/**
> > + * die_find_func_rettype - Search a return type of function
> > + * @cu_die: a CU DIE
> > + * @name: target function name
> > + * @die_mem: a buffer for result DIE
> > + *
> > + * Search a non-inlined function which matches to @name and stores the
> > + * return type of the function to @die_mem and returns it if found.
> > + * Returns NULL if failed. Note that it doesn't needs to find a
> > + * definition of the function, so it doesn't match with address.
> > + * Most likely, it can find a declaration at the top level. Thus the
> > + * callback function continues to sibling entries only.
> > + */
> > +Dwarf_Die *die_find_func_rettype(Dwarf_Die *cu_die, const char *name,
> > + Dwarf_Die *die_mem)
> > +{
> > + Dwarf_Die tmp_die;
> > +
> > + cu_die = die_find_child(cu_die, __die_find_func_rettype_cb,
> > + (void *)name, &tmp_die);
> > + if (!cu_die)
> > + return NULL;
> > +
> > + if (die_get_real_type(&tmp_die, die_mem) == NULL)
> > + return NULL;
>
>
> Here you check die_get_real_type() return, may I go and do the same for
> the previous patch to address my review comment?
Sure thing! :)
|