linux-kernel - [PATCH v7 20/22] perf python: Add __str__ and __repr_

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Message-Id: <20241119011644.971342-21-irogers@google.com>
Date: Mon, 18 Nov 2024 17:16:42 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Howard Chu <howardchu95@...il.com>, Athira Jajeev <atrajeev@...ux.vnet.ibm.com>, 
	Michael Petlan <mpetlan@...hat.com>, Veronika Molnarova <vmolnaro@...hat.com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>, Thomas Richter <tmricht@...ux.ibm.com>, 
	Ilya Leoshkevich <iii@...ux.ibm.com>, Colin Ian King <colin.i.king@...il.com>, 
	Weilin Wang <weilin.wang@...el.com>, Andi Kleen <ak@...ux.intel.com>, 
	Josh Poimboeuf <jpoimboe@...hat.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH v7 20/22] perf python: Add __str__ and __repr__ functions to evlist

This allows the values in the evlist to be shown in the REPL like:
```
Python 3.11.9 (main, Jun 19 2024, 00:38:48) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path.insert(0,'/tmp/perf/python')
>>> import perf
>>> perf.parse_events('cycles,data_read')
evlist([cycles,uncore_imc_free_running_0/data_read/,uncore_imc_free_running_1/data_read/])
```

Signed-off-by: Ian Rogers <irogers@...gle.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/python.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index c84c912874b7..c556cbc582ae 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -1069,6 +1069,30 @@ static PyObject *pyrf_evlist__item(PyObject *obj, Py_ssize_t i)
 	return Py_BuildValue("O", container_of(pos, struct pyrf_evsel, evsel));
 }
 
+static PyObject *pyrf_evlist__str(PyObject *self)
+{
+	struct pyrf_evlist *pevlist = (void *)self;
+	struct evsel *pos;
+	struct strbuf sb = STRBUF_INIT;
+	bool first = true;
+	PyObject *result;
+
+	strbuf_addstr(&sb, "evlist([");
+	evlist__for_each_entry(&pevlist->evlist, pos) {
+		if (!first)
+			strbuf_addch(&sb, ',');
+		if (!pos->pmu)
+			strbuf_addstr(&sb, evsel__name(pos));
+		else
+			strbuf_addf(&sb, "%s/%s/", pos->pmu->name, evsel__name(pos));
+		first = false;
+	}
+	strbuf_addstr(&sb, "])");
+	result = PyUnicode_FromString(sb.buf);
+	strbuf_release(&sb);
+	return result;
+}
+
 static PySequenceMethods pyrf_evlist__sequence_methods = {
 	.sq_length = pyrf_evlist__length,
 	.sq_item   = pyrf_evlist__item,
@@ -1086,6 +1110,8 @@ static PyTypeObject pyrf_evlist__type = {
 	.tp_doc		= pyrf_evlist__doc,
 	.tp_methods	= pyrf_evlist__methods,
 	.tp_init	= (initproc)pyrf_evlist__init,
+	.tp_repr        = pyrf_evlist__str,
+	.tp_str         = pyrf_evlist__str,
 };
 
 static int pyrf_evlist__setup_types(void)
-- 
2.47.0.338.g60cca15819-goog