linux-kernel - Re: [PATCH v2 2/4] perf tools: Add link argument to dso__find_symbol_by

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Message-ID: <20150115002359.GB2096@sejong>
Date:	Thu, 15 Jan 2015 09:23:59 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH v2 2/4] perf tools: Add link argument to
 dso__find_symbol_by_name()

On Wed, Jan 14, 2015 at 09:36:34AM -0700, David Ahern wrote:
> On 1/14/15 4:18 AM, Namhyung Kim wrote:
> >@@ -414,10 +414,24 @@ static struct symbol *symbols__find_by_name(struct rb_root *symbols,
> >  		else if (cmp > 0)
> >  			n = n->rb_right;
> >  		else
> >-			return &s->sym;
> >+			break;
> >  	}
> >
> >-	return NULL;
> >+	if (n == NULL)
> >+		return NULL;
> >+
> >+	/* return first symbol that has same name (if any) */
> >+	for (n = rb_prev(n); n; n = rb_prev(n)) {
> >+		struct symbol_name_rb_node *tmp;
> >+
> >+		tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
> >+		if (strcmp(tmp->sym.name, s->sym.name))
> 
> strcmp() == 0?

No, at this point the 's' points to the first symbol that has same
name.  And if it finds another symbol (tmp) that has same name, it
updates the s to point to the tmp and continues.  Otherwise it returns
with the existing symbol (s).

Thanks,
Namhyung


> 
> >+			break;
> >+
> >+		s = tmp;
> >+	}
> >+
> >+	return &s->sym;
> >  }
> >
> >  struct symbol *dso__find_symbol(struct dso *dso,
> 
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