Hi Masami,
On Sun, Nov 5, 2023 at 1:07 AM Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>
> On Wed, 11 Oct 2023 20:50:31 -0700
> Namhyung Kim <namhyung@xxxxxxxxxx> wrote:
>
> > The __die_get_typename() is to get the name of the given DIE in C-style
> > type name. The difference from the die_get_typename() is that it does
> > not retrieve the DW_AT_type and use the given DIE directly. This will
> > be used when users know the type DIE already.
>
> Hmm, I would rather like to have another name for this function.
> What about 'die_get_typename_from_type()' ?
Ok.
> >
> > Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> > Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> > ---
> > tools/perf/util/dwarf-aux.c | 38 ++++++++++++++++++++++++++-----------
> > tools/perf/util/dwarf-aux.h | 3 +++
> > 2 files changed, 30 insertions(+), 11 deletions(-)
> >
> > diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
> > index 652e6e7368a2..5bb05c84d249 100644
> > --- a/tools/perf/util/dwarf-aux.c
> > +++ b/tools/perf/util/dwarf-aux.c
> > @@ -1051,32 +1051,28 @@ Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
> > }
> >
> > /**
> > - * die_get_typename - Get the name of given variable DIE
> > - * @vr_die: a variable DIE
> > + * __die_get_typename - Get the name of given type DIE
> > + * @type: a type DIE
> > * @buf: a strbuf for result type name
> > *
> > - * Get the name of @vr_die and stores it to @buf. Return 0 if succeeded.
> > + * Get the name of @type_die and stores it to @buf. Return 0 if succeeded.
> > * and Return -ENOENT if failed to find type name.
> > * Note that the result will stores typedef name if possible, and stores
> > * "*(function_type)" if the type is a function pointer.
> > */
> > -int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
> > +int __die_get_typename(Dwarf_Die *type, struct strbuf *buf)
>
> Could you use 'type_die' instead of 'type' if it is exposed?
Will change, thanks for your review!
Namhyung
> > {
> > - Dwarf_Die type;
> > int tag, ret;
> > const char *tmp = "";
> >
> > - if (__die_get_real_type(vr_die, &type) == NULL)
> > - return -ENOENT;
> > -
> > - tag = dwarf_tag(&type);
> > + tag = dwarf_tag(type);
> > if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)
> > tmp = "*";
> > else if (tag == DW_TAG_subroutine_type) {
> > /* Function pointer */
> > return strbuf_add(buf, "(function_type)", 15);
> > } else {
> > - const char *name = dwarf_diename(&type);
> > + const char *name = dwarf_diename(type);
> >
> > if (tag == DW_TAG_union_type)
> > tmp = "union ";
> > @@ -1089,7 +1085,7 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
> > /* Write a base name */
> > return strbuf_addf(buf, "%s%s", tmp, name ?: "");
> > }
> > - ret = die_get_typename(&type, buf);
> > + ret = die_get_typename(type, buf);
> > if (ret < 0) {
> > /* void pointer has no type attribute */
> > if (tag == DW_TAG_pointer_type && ret == -ENOENT)
> > @@ -1100,6 +1096,26 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
> > return strbuf_addstr(buf, tmp);
> > }
> >
> > +/**
> > + * die_get_typename - Get the name of given variable DIE
> > + * @vr_die: a variable DIE
> > + * @buf: a strbuf for result type name
> > + *
> > + * Get the name of @vr_die and stores it to @buf. Return 0 if succeeded.
> > + * and Return -ENOENT if failed to find type name.
> > + * Note that the result will stores typedef name if possible, and stores
> > + * "*(function_type)" if the type is a function pointer.
> > + */
> > +int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
> > +{
> > + Dwarf_Die type;
> > +
> > + if (__die_get_real_type(vr_die, &type) == NULL)
> > + return -ENOENT;
> > +
> > + return __die_get_typename(&type, buf);
> > +}
> > +
> > /**
> > * die_get_varname - Get the name and type of given variable DIE
> > * @vr_die: a variable DIE
> > diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
> > index b6f430730bd1..574405c57d3b 100644
> > --- a/tools/perf/util/dwarf-aux.h
> > +++ b/tools/perf/util/dwarf-aux.h
> > @@ -116,6 +116,9 @@ Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
> > Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
> > Dwarf_Die *die_mem);
> >
> > +/* Get the name of given type DIE */
> > +int __die_get_typename(Dwarf_Die *type, struct strbuf *buf);
> > +
> > /* Get the name of given variable DIE */
> > int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf);
> >
> > --
> > 2.42.0.655.g421f12c284-goog
> >
>
>
> --
> Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
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