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perf symbols: Fix comparision of build_ids 

When we read the build_id from the DSO name to then index into
/usr/lib/debug/.buildid/DSO_BUILD_ID[0:2]/DSO_BUILD_ID[2:], we
were jumping directly to the comparision with the buildid we
already have in dso->build_id (that came from the perf.data
build_id section, collected at perf record time)
unconditionally, even if we didn't had recorded it, and
furthermore, comparing a formatted buildid with a rawbuildid, yikes.

Fix it by deleting the dso__read_build_id() function, that was
really misdesigned anyway, and do the necessary checks and
correct comparison of raw buildids.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1258582853-8579-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2009-11-18 20:20:50 -02:00 committed by Ingo Molnar
parent b269876c8d
commit d3379ab905
1 changed files with 16 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
tools/perf/util/symbol.c
View File

@ -962,25 +962,6 @@ out:
return err;
}
static char *dso__read_build_id(struct dso *self)
{
int len;
char *build_id = NULL;
unsigned char rawbf[BUILD_ID_SIZE];
len = filename__read_build_id(self->long_name, rawbf, sizeof(rawbf));
if (len < 0)
goto out;
build_id = malloc(len * 2 + 1);
if (build_id == NULL)
goto out;
build_id__sprintf(rawbf, len, build_id);
out:
return build_id;
}
char dso__symtab_origin(const struct dso *self)
{
static const char origin[] = {
@ -1001,7 +982,8 @@ char dso__symtab_origin(const struct dso *self)
int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
{
int size = PATH_MAX;
char *name = malloc(size), *build_id = NULL;
char *name = malloc(size);
u8 build_id[BUILD_ID_SIZE];
int ret = -1;
int fd;
@ -1023,8 +1005,6 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
more:
do {
int berr = 0;
self->origin++;
switch (self->origin) {
case DSO__ORIG_FEDORA:
@ -1036,12 +1016,18 @@ more:
self->long_name);
break;
case DSO__ORIG_BUILDID:
build_id = dso__read_build_id(self);
if (build_id != NULL) {
if (filename__read_build_id(self->long_name, build_id,
sizeof(build_id))) {
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
build_id__sprintf(build_id, sizeof(build_id),
build_id_hex);
snprintf(name, size,
"/usr/lib/debug/.build-id/%.2s/%s.debug",
build_id, build_id + 2);
goto compare_build_id;
build_id_hex, build_id_hex + 2);
if (self->has_build_id)
goto compare_build_id;
break;
}
self->origin++;
/* Fall thru */
@ -1054,18 +1040,12 @@ more:
}
if (self->has_build_id) {
bool match;
build_id = malloc(BUILD_ID_SIZE);
if (build_id == NULL)
if (filename__read_build_id(name, build_id,
sizeof(build_id)) < 0)
goto more;
berr = filename__read_build_id(name, build_id,
BUILD_ID_SIZE);
compare_build_id:
match = berr > 0 && memcmp(build_id, self->build_id,
sizeof(self->build_id)) == 0;
free(build_id);
build_id = NULL;
if (!match)
if (memcmp(build_id, self->build_id,
sizeof(self->build_id)) != 0)
goto more;
}