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@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210530192308.7382-8-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/scripts/python/Perf-Trace-Util/Context.c b/tools/perf/scripts/python/Perf-Trace-Util/Context.c
index 26a45ae..d7f0442 100644 (file)
--- 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}
 };