linux-kernel - [PATCH 07/13] perf scripting python: Add perf_sample

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Message-Id: <20210530192308.7382-8-adrian.hunter@intel.com>
Date:   Sun, 30 May 2021 22:23:02 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 07/13] perf scripting python: Add perf_sample_insn()

Add perf_sample_insn() to the perf_trace_context module so that a script
can get the instruction bytes.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 .../scripts/python/Perf-Trace-Util/Context.c  | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/tools/perf/scripts/python/Perf-Trace-Util/Context.c b/tools/perf/scripts/python/Perf-Trace-Util/Context.c
index 26a45ae78be4..d7f044259f9b 100644
--- a/tools/perf/scripts/python/Perf-Trace-Util/Context.c
+++ b/tools/perf/scripts/python/Perf-Trace-Util/Context.c
@@ -7,15 +7,23 @@
 
 #include <Python.h>
 #include "../../../util/trace-event.h"
+#include "../../../util/event.h"
+#include "../../../util/symbol.h"
+#include "../../../util/thread.h"
+#include "../../../util/maps.h"
 
 #if PY_MAJOR_VERSION < 3
 #define _PyCapsule_GetPointer(arg1, arg2) \
   PyCObject_AsVoidPtr(arg1)
+#define _PyBytes_FromStringAndSize(arg1, arg2) \
+  PyString_FromStringAndSize((arg1), (arg2))
 
 PyMODINIT_FUNC initperf_trace_context(void);
 #else
 #define _PyCapsule_GetPointer(arg1, arg2) \
   PyCapsule_GetPointer((arg1), (arg2))
+#define _PyBytes_FromStringAndSize(arg1, arg2) \
+  PyBytes_FromStringAndSize((arg1), (arg2))
 
 PyMODINIT_FUNC PyInit_perf_trace_context(void);
 #endif
@@ -62,6 +70,23 @@ static PyObject *perf_trace_context_common_lock_depth(PyObject *obj,
 	return Py_BuildValue("i", common_lock_depth(c));
 }
 
+static PyObject *perf_sample_insn(PyObject *obj, PyObject *args)
+{
+	struct scripting_context *c = get_scripting_context(args);
+
+	if (!c)
+		return NULL;
+
+	if (c->sample->ip && !c->sample->insn_len &&
+	    c->al->thread->maps && c->al->thread->maps->machine)
+		script_fetch_insn(c->sample, c->al->thread, c->al->thread->maps->machine);
+
+	if (!c->sample->insn_len)
+		Py_RETURN_NONE; /* N.B. This is a return statement */
+
+	return _PyBytes_FromStringAndSize(c->sample->insn, c->sample->insn_len);
+}
+
 static PyMethodDef ContextMethods[] = {
 	{ "common_pc", perf_trace_context_common_pc, METH_VARARGS,
 	  "Get the common preempt count event field value."},
@@ -69,6 +94,8 @@ static PyMethodDef ContextMethods[] = {
 	  "Get the common flags event field value."},
 	{ "common_lock_depth", perf_trace_context_common_lock_depth,
 	  METH_VARARGS,	"Get the common lock depth event field value."},
+	{ "perf_sample_insn", perf_sample_insn,
+	  METH_VARARGS,	"Get the machine code instruction."},
 	{ NULL, NULL, 0, NULL}
 };
 
-- 
2.17.1