perf script: Refine printing of dso offset (dsoff)

Print dso offset only for object files, and in those cases force using the
dso->long_name if the dso->name starts with '[' or the dso is kcore, in
order to avoid special names such as [vdso], or mixing up kcore with
vmlinux.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230424055107.12105-3-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/dso.c

@@ -67,6 +67,39 @@ char dso__symtab_origin(const struct dso *dso)
 	return origin[dso->symtab_type];
 }
 
+bool dso__is_object_file(const struct dso *dso)
+{
+	switch (dso->binary_type) {
+	case DSO_BINARY_TYPE__KALLSYMS:
+	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
+	case DSO_BINARY_TYPE__JAVA_JIT:
+	case DSO_BINARY_TYPE__BPF_PROG_INFO:
+	case DSO_BINARY_TYPE__BPF_IMAGE:
+	case DSO_BINARY_TYPE__OOL:
+		return false;
+	case DSO_BINARY_TYPE__VMLINUX:
+	case DSO_BINARY_TYPE__GUEST_VMLINUX:
+	case DSO_BINARY_TYPE__DEBUGLINK:
+	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
+	case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
+	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
+	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
+	case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
+	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
+	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
+	case DSO_BINARY_TYPE__GUEST_KMODULE:
+	case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
+	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
+	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
+	case DSO_BINARY_TYPE__KCORE:
+	case DSO_BINARY_TYPE__GUEST_KCORE:
+	case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
+	case DSO_BINARY_TYPE__NOT_FOUND:
+	default:
+		return true;
+	}
+}
+
 int dso__read_binary_type_filename(const struct dso *dso,
 				   enum dso_binary_type type,
 				   char *root_dir, char *filename, size_t size)

tools/perf/util/dso.h

@@ -396,6 +396,8 @@ static inline bool dso__is_kallsyms(const struct dso *dso)
 	return dso->kernel && dso->long_name[0] != '/';
 }
 
+bool dso__is_object_file(const struct dso *dso);
+
 void dso__free_a2l(struct dso *dso);
 
 enum dso_type dso__type(struct dso *dso, struct machine *machine);

tools/perf/util/map.c

@@ -431,14 +431,21 @@ size_t map__fprintf(struct map *map, FILE *fp)
 		       map__start(map), map__end(map), map__pgoff(map), dso->name);
 }
 
-size_t map__fprintf_dsoname(struct map *map, FILE *fp)
+static bool prefer_dso_long_name(const struct dso *dso, bool print_off)
+{
+	return dso->long_name &&
+	       (symbol_conf.show_kernel_path ||
+		(print_off && (dso->name[0] == '[' || dso__is_kcore(dso))));
+}
+
+static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp)
 {
 	char buf[symbol_conf.pad_output_len_dso + 1];
 	const char *dsoname = "[unknown]";
 	const struct dso *dso = map ? map__dso(map) : NULL;
 
 	if (dso) {
-		if (symbol_conf.show_kernel_path && dso->long_name)
+		if (prefer_dso_long_name(dso, print_off))
 			dsoname = dso->long_name;
 		else
 			dsoname = dso->name;
@@ -452,13 +459,21 @@ size_t map__fprintf_dsoname(struct map *map, FILE *fp)
 	return fprintf(fp, "%s", dsoname);
 }
 
+size_t map__fprintf_dsoname(struct map *map, FILE *fp)
+{
+	return __map__fprintf_dsoname(map, false, fp);
+}
+
 size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp)
 {
+	const struct dso *dso = map ? map__dso(map) : NULL;
 	int printed = 0;
 
+	if (print_off && (!dso || !dso__is_object_file(dso)))
+		print_off = false;
 	printed += fprintf(fp, " (");
-	printed += map__fprintf_dsoname(map, fp);
-	if (print_off && map && map__dso(map) && !map__dso(map)->kernel)
+	printed += __map__fprintf_dsoname(map, print_off, fp);
+	if (print_off)
 		printed += fprintf(fp, "+0x%" PRIx64, addr);
 	printed += fprintf(fp, ")");