perf python: Add parse_events function

Add basic parse_events function that takes a string and returns an
evlist. As the python evlist is embedded in a pyrf_evlist, and the
evsels are embedded in pyrf_evsels, copy the parsed data into those
structs and update evsel__clone to enable this.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Veronika Molnarova <vmolnaro@redhat.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Link: https://lore.kernel.org/r/20241119011644.971342-20-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 3e32a502a41c..c84c912874b7 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -13,6 +13,7 @@
 #include "evsel.h"
 #include "event.h"
 #include "print_binary.h"
+#include "strbuf.h"
 #include "thread_map.h"
 #include "trace-event.h"
 #include "mmap.h"
@@ -1201,6 +1202,60 @@ static PyObject *pyrf__tracepoint(struct pyrf_evsel *pevsel,
 #endif // HAVE_LIBTRACEEVENT
 }
 
+static PyObject *pyrf_evsel__from_evsel(struct evsel *evsel)
+{
+	struct pyrf_evsel *pevsel = PyObject_New(struct pyrf_evsel, &pyrf_evsel__type);
+
+	if (!pevsel)
+		return NULL;
+
+	memset(&pevsel->evsel, 0, sizeof(pevsel->evsel));
+	evsel__init(&pevsel->evsel, &evsel->core.attr, evsel->core.idx);
+
+	evsel__clone(&pevsel->evsel, evsel);
+	return (PyObject *)pevsel;
+}
+
+static PyObject *pyrf_evlist__from_evlist(struct evlist *evlist)
+{
+	struct pyrf_evlist *pevlist = PyObject_New(struct pyrf_evlist, &pyrf_evlist__type);
+	struct evsel *pos;
+
+	if (!pevlist)
+		return NULL;
+
+	memset(&pevlist->evlist, 0, sizeof(pevlist->evlist));
+	evlist__init(&pevlist->evlist, evlist->core.all_cpus, evlist->core.threads);
+	evlist__for_each_entry(evlist, pos) {
+		struct pyrf_evsel *pevsel = (void *)pyrf_evsel__from_evsel(pos);
+
+		evlist__add(&pevlist->evlist, &pevsel->evsel);
+	}
+	return (PyObject *)pevlist;
+}
+
+static PyObject *pyrf__parse_events(PyObject *self, PyObject *args)
+{
+	const char *input;
+	struct evlist evlist = {};
+	struct parse_events_error err;
+	PyObject *result;
+
+	if (!PyArg_ParseTuple(args, "s", &input))
+		return NULL;
+
+	parse_events_error__init(&err);
+	evlist__init(&evlist, NULL, NULL);
+	if (parse_events(&evlist, input, &err)) {
+		parse_events_error__print(&err, input);
+		PyErr_SetFromErrno(PyExc_OSError);
+		return NULL;
+	}
+	result = pyrf_evlist__from_evlist(&evlist);
+	evlist__exit(&evlist);
+	return result;
+}
+
 static PyMethodDef perf__methods[] = {
 	{
 		.ml_name  = "tracepoint",
@@ -1208,6 +1263,12 @@ static PyMethodDef perf__methods[] = {
 		.ml_flags = METH_VARARGS | METH_KEYWORDS,
 		.ml_doc	  = PyDoc_STR("Get tracepoint config.")
 	},
+	{
+		.ml_name  = "parse_events",
+		.ml_meth  = (PyCFunction) pyrf__parse_events,
+		.ml_flags = METH_VARARGS,
+		.ml_doc	  = PyDoc_STR("Parse a string of events and return an evlist.")
+	},
 	{ .ml_name = NULL, }
 };