perf addr_location: Add init/exit/copy functions

struct addr_location holds references to multiple reference counted
objects. Add init/exit functions to make maintenance of those more
consistent with the rest of the code and to try to avoid
leaks. Modification of thread reference counts isn't included in this
change.

Committer notes:

I needed to initialize result to sample->ip to make sure is set to
something, fixing a compile time error, mostly keeping the previous
logic as build_alloc_func_list() already does debugging/error prints
about what went wrong if it takes the 'goto out'.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Brian Robbins <brianrob@linux.microsoft.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Fangrui Song <maskray@google.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ivan Babrou <ivan@cloudflare.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Wenyu Liu <liuwenyu7@huawei.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Ye Xingchen <ye.xingchen@zte.com.cn>
Cc: Yuan Can <yuancan@huawei.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230608232823.4027869-7-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index f3d262e871ac..d7c99028c6e6 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -469,9 +469,11 @@ static PyObject *python_process_callchain(struct perf_sample *sample,
 				struct addr_location node_al;
 				unsigned long offset;
 
+				addr_location__init(&node_al);
 				node_al.addr = map__map_ip(map, node->ip);
-				node_al.map  = map;
+				node_al.map  = map__get(map);
 				offset = get_offset(node->ms.sym, &node_al);
+				addr_location__exit(&node_al);
 
 				pydict_set_item_string_decref(
 					pyelem, "sym_off",
@@ -539,6 +541,7 @@ static PyObject *python_process_brstack(struct perf_sample *sample,
 		pydict_set_item_string_decref(pyelem, "cycles",
 		    PyLong_FromUnsignedLongLong(entries[i].flags.cycles));
 
+		addr_location__init(&al);
 		thread__find_map_fb(thread, sample->cpumode,
 				    entries[i].from, &al);
 		dsoname = get_dsoname(al.map);
@@ -551,6 +554,7 @@ static PyObject *python_process_brstack(struct perf_sample *sample,
 		pydict_set_item_string_decref(pyelem, "to_dsoname",
 					      _PyUnicode_FromString(dsoname));
 
+		addr_location__exit(&al);
 		PyList_Append(pylist, pyelem);
 		Py_DECREF(pyelem);
 	}
@@ -594,7 +598,6 @@ static PyObject *python_process_brstacksym(struct perf_sample *sample,
 	PyObject *pylist;
 	u64 i;
 	char bf[512];
-	struct addr_location al;
 
 	pylist = PyList_New(0);
 	if (!pylist)
@@ -605,7 +608,9 @@ static PyObject *python_process_brstacksym(struct perf_sample *sample,
 
 	for (i = 0; i < br->nr; i++) {
 		PyObject *pyelem;
+		struct addr_location al;
 
+		addr_location__init(&al);
 		pyelem = PyDict_New();
 		if (!pyelem)
 			Py_FatalError("couldn't create Python dictionary");
@@ -644,6 +649,7 @@ static PyObject *python_process_brstacksym(struct perf_sample *sample,
 
 		PyList_Append(pylist, pyelem);
 		Py_DECREF(pyelem);
+		addr_location__exit(&al);
 	}
 
 exit: