perf probe: Fix handling of arguments names

Don't make argument names from raw parameters (means the parameters are written
in kprobe-tracer syntax), because the argument syntax may include special
characters.  Just leave it, then kprobe-tracer gives a new name.

Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100827113859.22882.75598.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 9b0e1b1f975579e7ef9b73d4f834d34e4e75a11d..32b81f707ff5eb5d950a2d233d6c00c6b90fedb2 100644 (file)
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -686,6 +686,25 @@ static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
        char buf[32], *ptr;
        int ret, nscopes;
 
+       if (!is_c_varname(pf->pvar->var)) {
+               /* Copy raw parameters */
+               pf->tvar->value = strdup(pf->pvar->var);
+               if (pf->tvar->value == NULL)
+                       return -ENOMEM;
+               if (pf->pvar->type) {
+                       pf->tvar->type = strdup(pf->pvar->type);
+                       if (pf->tvar->type == NULL)
+                               return -ENOMEM;
+               }
+               if (pf->pvar->name) {
+                       pf->tvar->name = strdup(pf->pvar->name);
+                       if (pf->tvar->name == NULL)
+                               return -ENOMEM;
+               } else
+                       pf->tvar->name = NULL;
+               return 0;
+       }
+
        if (pf->pvar->name)
                pf->tvar->name = strdup(pf->pvar->name);
        else {
@@ -700,19 +719,6 @@ static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
        if (pf->tvar->name == NULL)
                return -ENOMEM;
 
-       if (!is_c_varname(pf->pvar->var)) {
-               /* Copy raw parameters */
-               pf->tvar->value = strdup(pf->pvar->var);
-               if (pf->tvar->value == NULL)
-                       return -ENOMEM;
-               if (pf->pvar->type) {
-                       pf->tvar->type = strdup(pf->pvar->type);
-                       if (pf->tvar->type == NULL)
-                               return -ENOMEM;
-               }
-               return 0;
-       }
-
        pr_debug("Searching '%s' variable in context.\n",
                 pf->pvar->var);
        /* Search child die for local variables and parameters. */