Re: [PATCH 05/14] perf tools: Add dsos__new function

From: Arnaldo Carvalho de Melo
Date: Tue Mar 03 2015 - 11:21:48 EST


Em Tue, Mar 03, 2015 at 04:29:32PM +0100, Jiri Olsa escreveu:
> Separate the creation of new dso object and its addition
> to the dsos list. It will be used in following patch.
>
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
> Cc: David Ahern <dsahern@xxxxxxxxx>
> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> Cc: Stephane Eranian <eranian@xxxxxxxxxx>
> ---
> tools/perf/util/dso.c | 21 ++++++++++++---------
> tools/perf/util/dso.h | 1 +
> 2 files changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index be368414036c..fc54cb81c7f8 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -1005,21 +1005,24 @@ struct dso *dsos__find(const struct dsos *dsos, const char *name,
> return dso__find_by_longname(&dsos->root, name);
> }
>
> -struct dso *__dsos__findnew(struct dsos *dsos, const char *name)
> +struct dso *dsos__new(struct dsos *dsos, const char *name)

When I read dsos__new() I think that it will surely return a 'struct dsos'
pointer, as it is the constructor ('__new') for the 'dsos' class. :-)

Right now we don't have a constructor for dsos, because its only used in
machine where they are not m'allocated, i.e. we use just dsos__init(),
but if we ever need a constructor for it, it will be called dsos__new().

So, to use the same rationale for dsos__findnew(), we can call it
dsos__addnew(), because it will not find anything, just add a new dso.

- Arnaldo

> {
> - struct dso *dso = dsos__find(dsos, name, false);
> + struct dso *dso = dso__new(name);
>
> - if (!dso) {
> - dso = dso__new(name);
> - if (dso != NULL) {
> - dsos__add(dsos, dso);
> - dso__set_basename(dso);
> - }
> + if (dso != NULL) {
> + dsos__add(dsos, dso);
> + dso__set_basename(dso);
> }
> -
> return dso;
> }
>
> +struct dso *__dsos__findnew(struct dsos *dsos, const char *name)
> +{
> + struct dso *dso = dsos__find(dsos, name, false);
> +
> + return dso ? dso : dsos__new(dsos, name);
> +}
> +
> size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
> bool (skip)(struct dso *dso, int parm), int parm)
> {
> diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
> index ced92841ff97..a712cbcd3a72 100644
> --- a/tools/perf/util/dso.h
> +++ b/tools/perf/util/dso.h
> @@ -249,6 +249,7 @@ struct dso *dso__kernel_findnew(struct machine *machine, const char *name,
> const char *short_name, int dso_type);
>
> void dsos__add(struct dsos *dsos, struct dso *dso);
> +struct dso *dsos__new(struct dsos *dsos, const char *name);
> struct dso *dsos__find(const struct dsos *dsos, const char *name,
> bool cmp_short);
> struct dso *__dsos__findnew(struct dsos *dsos, const char *name);
> --
> 1.9.3
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