perf symbols: Demangle cloned functions

The libbfd C++ demangler doesn't seem to deal with cloned functions,
like symbol.clone.NUM.

Just strip the dot part before demangling and add it back later.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1378998998-10802-1-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 26 insertions, 1 deletions

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index a9c829be5216..d2a888e2e058 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -928,8 +928,33 @@ int dso__load_sym(struct dso *dso, struct map *map,
                  * to it...
                  */
                 if (symbol_conf.demangle) {
-                        demangled = bfd_demangle(NULL, elf_name,
+                        /*
+                         * The demangler doesn't deal with cloned functions.
+                         * XXXX.clone.NUM or similar
+                         * Strip the dot part and readd it later.
+                         */
+                        char *p = (char *)elf_name, *dot;
+                        dot = strchr(elf_name, '.');
+                        if (dot) {
+                                p = strdup(elf_name);
+                                if (!p)
+                                        goto new_symbol;
+                                dot = strchr(p, '.');
+                                *dot = 0;
+                        }
+
+                        demangled = bfd_demangle(NULL, p,
                                                  DMGL_PARAMS | DMGL_ANSI);
+                        if (dot)
+                                *dot = '.';
+                        if (demangled && dot) {
+                                demangled = realloc(demangled, strlen(demangled) + strlen(dot) + 1);
+                                if (!demangled)
+                                        goto new_symbol;
+                                strcpy(demangled + (dot - p), dot);
+                        }
+                        if (p != elf_name)
+                                free(p);
                         if (demangled != NULL)
                                 elf_name = demangled;
                 }