[PATCH V2 08/10] perf dlfilter: Add srcline() to perf_dlfilter_fns

Adrian Hunter
2021-06-27T13:18:30Z

Add a function, for use by dlfilters, to return source code file name and
line number.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/Documentation/perf-dlfilter.txt | 5 +++-
tools/perf/util/dlfilter.c | 28 ++++++++++++++++++++++
tools/perf/util/perf_dlfilter.h | 4 +++-
3 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-dlfilter.txt b/tools/perf/Documentation/perf-dlfilter.txt
index bc4dba0995d8..df118ddcd7f4 100644
--- a/tools/perf/Documentation/perf-dlfilter.txt
+++ b/tools/perf/Documentation/perf-dlfilter.txt
@@ -125,7 +125,8 @@ struct perf_dlfilter_fns {
char **(*args)(void *ctx, int *dlargc);
__s32 (*resolve_address)(void *ctx, __u64 address, struct perf_dlfilter_al *al);
const __u8 *(*insn)(void *ctx, __u32 *length);
- void *(*reserved[123])(void *);
+ const char *(*srcline)(void *ctx, __u32 *line_number);
+ void *(*reserved[122])(void *);
};
----

@@ -140,6 +141,8 @@ before calling. Returns 0 on success, -1 otherwise.

'insn' returns instruction bytes and length.

+'srcline' return source file name and line number.
+
The perf_dlfilter_al structure
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

diff --git a/tools/perf/util/dlfilter.c b/tools/perf/util/dlfilter.c
index 79a899255c01..f4ce1a80bddc 100644
--- a/tools/perf/util/dlfilter.c
+++ b/tools/perf/util/dlfilter.c
@@ -19,6 +19,7 @@
#include "thread.h"
#include "trace-event.h"
#include "symbol.h"
+#include "srcline.h"
#include "dlfilter.h"
#include "perf_dlfilter.h"

@@ -208,12 +209,39 @@ static const __u8 *dlfilter__insn(void *ctx, __u32 *len)
return (__u8 *)d->sample->insn;
}

+static const char *dlfilter__srcline(void *ctx, __u32 *line_no)
+{
+ struct dlfilter *d = (struct dlfilter *)ctx;
+ struct addr_location *al;
+ unsigned int line = 0;
+ char *srcfile = NULL;
+ struct map *map;
+ u64 addr;
+
+ if (!d->ctx_valid || !line_no)
+ return NULL;
+
+ al = get_al(d);
+ if (!al)
+ return NULL;
+
+ map = al->map;
+ addr = al->addr;
+
+ if (map && map->dso)
+ srcfile = get_srcline_split(map->dso, map__rip_2objdump(map, addr), &line);
+
+ *line_no = line;
+ return srcfile;
+}
+
static const struct perf_dlfilter_fns perf_dlfilter_fns = {
.resolve_ip = dlfilter__resolve_ip,
.resolve_addr = dlfilter__resolve_addr,
.args = dlfilter__args,
.resolve_address = dlfilter__resolve_address,
.insn = dlfilter__insn,
+ .srcline = dlfilter__srcline,
};

static char *find_dlfilter(const char *file)
diff --git a/tools/perf/util/perf_dlfilter.h b/tools/perf/util/perf_dlfilter.h
index 763c5af3c5f7..b989918056e2 100644
--- a/tools/perf/util/perf_dlfilter.h
+++ b/tools/perf/util/perf_dlfilter.h
@@ -99,8 +99,10 @@ struct perf_dlfilter_fns {
__s32 (*resolve_address)(void *ctx, __u64 address, struct perf_dlfilter_al *al);
/* Return instruction bytes and length */
const __u8 *(*insn)(void *ctx, __u32 *length);
+ /* Return source file name and line number */
+ const char *(*srcline)(void *ctx, __u32 *line_number);
/* Reserved */
- void *(*reserved[123])(void *);
+ void *(*reserved[122])(void *);
};

/*
--
2.17.1