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From: tip-bot for Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: linux-tip-commits@vger.kernel.org
Cc: acme@redhat.com, linux-kernel@vger.kernel.org, paulus@samba.org,
	hpa@zytor.com, mingo@redhat.com, peterz@infradead.org,
	penberg@kernel.org, masami.hiramatsu.pt@hitachi.com,
	fweisbec@gmail.com, tglx@linutronix.de, mingo@elte.hu
Subject: [tip:perf/core] perf probe: Avoid searching variables in intermediate scopes
Date: Sun, 14 Aug 2011 15:47:09 GMT	[thread overview]
Message-ID: <tip-f182e3e13ca71b64b40fab1aef31fa6a78271648@git.kernel.org> (raw)
In-Reply-To: <20110811110305.19900.94374.stgit@fedora15>

Commit-ID:  f182e3e13ca71b64b40fab1aef31fa6a78271648
Gitweb:     http://git.kernel.org/tip/f182e3e13ca71b64b40fab1aef31fa6a78271648
Author:     Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
AuthorDate: Thu, 11 Aug 2011 20:03:05 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 12 Aug 2011 09:29:34 -0300

perf probe: Avoid searching variables in intermediate scopes

Fix variable searching logic to search one in inner than local scope or
global(CU) scope. In the other words, skip searching in intermediate
scopes.

e.g., in the following code,

int var1;

void inline infunc(int i)
{
    i++;   <--- [A]
}

void func(void)
{
   int var1, var2;
   infunc(var2);
}

At [A], "var1" should point the global variable "var1", however, if user
mis-typed as "var2", variable search should be failed. However, current
logic searches variable infunc() scope, global scope, and then func()
scope. Thus, it can find "var2" variable in func() scope. This may not
be what user expects.

So, it would better not search outer scopes except outermost (compile
unit) scope which contains only global variables, when it failed to find
given variable in local scope.

E.g.

Without this:
$ perf probe -V pre_schedule --externs > without.vars

With this:
$ perf probe -V pre_schedule --externs > with.vars

Check the diff:
$ diff without.vars with.vars
88d87
<               int     cpu
133d131
<               long unsigned int*      switch_count

These vars are actually in the scope of schedule(), the caller of
pre_schedule().

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20110811110305.19900.94374.stgit@fedora15
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/probe-finder.c |   44 +++++++++++----------------------------
 1 files changed, 13 insertions(+), 31 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 5c83b7d..114542a 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -615,9 +615,9 @@ static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
 /* Find a variable in a scope DIE */
 static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
 {
-	Dwarf_Die vr_die, *scopes;
+	Dwarf_Die vr_die;
 	char buf[32], *ptr;
-	int ret, nscopes;
+	int ret = 0;
 
 	if (!is_c_varname(pf->pvar->var)) {
 		/* Copy raw parameters */
@@ -652,29 +652,16 @@ static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
 	if (pf->tvar->name == NULL)
 		return -ENOMEM;
 
-	pr_debug("Searching '%s' variable in context.\n",
-		 pf->pvar->var);
+	pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
 	/* Search child die for local variables and parameters. */
-	if (die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die))
-		ret = convert_variable(&vr_die, pf);
-	else {
-		/* Search upper class */
-		nscopes = dwarf_getscopes_die(sc_die, &scopes);
-		ret = -ENOENT;
-		while (nscopes-- > 1) {
-			pr_debug("Searching variables in %s\n",
-				 dwarf_diename(&scopes[nscopes]));
-			/* We should check this scope, so give dummy address */
-			if (die_find_variable_at(&scopes[nscopes],
-						 pf->pvar->var, 0,
-						 &vr_die)) {
-				ret = convert_variable(&vr_die, pf);
-				break;
-			}
-		}
-		if (scopes)
-			free(scopes);
+	if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
+		/* Search again in global variables */
+		if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die))
+			ret = -ENOENT;
 	}
+	if (ret == 0)
+		ret = convert_variable(&vr_die, pf);
+
 	if (ret < 0)
 		pr_warning("Failed to find '%s' in this function.\n",
 			   pf->pvar->var);
@@ -1242,8 +1229,8 @@ static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
 	struct available_var_finder *af =
 			container_of(pf, struct available_var_finder, pf);
 	struct variable_list *vl;
-	Dwarf_Die die_mem, *scopes = NULL;
-	int ret, nscopes;
+	Dwarf_Die die_mem;
+	int ret;
 
 	/* Check number of tevs */
 	if (af->nvls == af->max_vls) {
@@ -1273,12 +1260,7 @@ static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
 		goto out;
 	/* Don't need to search child DIE for externs. */
 	af->child = false;
-	nscopes = dwarf_getscopes_die(sc_die, &scopes);
-	while (nscopes-- > 1)
-		die_find_child(&scopes[nscopes], collect_variables_cb,
-			       (void *)af, &die_mem);
-	if (scopes)
-		free(scopes);
+	die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);
 
 out:
 	if (strlist__empty(vl->vars)) {

  reply	other threads:[~2011-08-14 15:47 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-11 11:02 [PATCH -tip v2 0/9]perf probe bugfixes Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 1/9] [BUGFIX] perf-probe: Fix a memory leak for scopes array Masami Hiramatsu
2011-08-14 15:39   ` [tip:perf/core] perf probe: " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 2/9] [BUGFIX] perf probe: Fix line walker to check CU correctly Masami Hiramatsu
2011-08-14 15:40   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 3/9] [BUGFIX] perf probe: Fix to search nested inlined functions in CU Masami Hiramatsu
2011-08-14 15:41   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 4/9] [BUGFIX] perf probe: Fix to walk all inline instances Masami Hiramatsu
2011-08-14 15:42   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 5/9] [BUGFIX] perf probe: Warn when more than one line are given Masami Hiramatsu
2011-08-14 15:44   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:02 ` [PATCH -tip v2 6/9] [BUGFIX] perf probe: Fix to search local variables in appropriate scope Masami Hiramatsu
2011-08-14 15:45   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:03 ` [PATCH -tip v2 7/9] [BUGFIX] perf probe: Avoid searching variables in intermediate scopes Masami Hiramatsu
2011-08-14 15:47   ` tip-bot for Masami Hiramatsu [this message]
2011-08-11 11:03 ` [PATCH -tip v2 8/9] [BUGFIX] perf probe: Search concrete out-of-line instances Masami Hiramatsu
2011-08-14 15:48   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2011-08-11 11:03 ` [PATCH -tip v2 9/9] [BUGFIX] perf probe: Filter out redundant inline-instances Masami Hiramatsu
2011-08-14 15:50   ` [tip:perf/core] " tip-bot for Masami Hiramatsu

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