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[linux.git] / tools / perf / scripts / python / Perf-Trace-Util / Context.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Context.c.  Python interfaces for perf script.
4  *
5  * Copyright (C) 2010 Tom Zanussi <[email protected]>
6  */
7
8 /*
9  * Use Py_ssize_t for '#' formats to avoid DeprecationWarning: PY_SSIZE_T_CLEAN
10  * will be required for '#' formats.
11  */
12 #define PY_SSIZE_T_CLEAN
13
14 #include <Python.h>
15 #include "../../../util/trace-event.h"
16 #include "../../../util/event.h"
17 #include "../../../util/symbol.h"
18 #include "../../../util/thread.h"
19 #include "../../../util/map.h"
20 #include "../../../util/maps.h"
21 #include "../../../util/auxtrace.h"
22 #include "../../../util/session.h"
23 #include "../../../util/srcline.h"
24 #include "../../../util/srccode.h"
25
26 #if PY_MAJOR_VERSION < 3
27 #define _PyCapsule_GetPointer(arg1, arg2) \
28   PyCObject_AsVoidPtr(arg1)
29 #define _PyBytes_FromStringAndSize(arg1, arg2) \
30   PyString_FromStringAndSize((arg1), (arg2))
31 #define _PyUnicode_AsUTF8(arg) \
32   PyString_AsString(arg)
33
34 PyMODINIT_FUNC initperf_trace_context(void);
35 #else
36 #define _PyCapsule_GetPointer(arg1, arg2) \
37   PyCapsule_GetPointer((arg1), (arg2))
38 #define _PyBytes_FromStringAndSize(arg1, arg2) \
39   PyBytes_FromStringAndSize((arg1), (arg2))
40 #define _PyUnicode_AsUTF8(arg) \
41   PyUnicode_AsUTF8(arg)
42
43 PyMODINIT_FUNC PyInit_perf_trace_context(void);
44 #endif
45
46 static struct scripting_context *get_args(PyObject *args, const char *name, PyObject **arg2)
47 {
48         int cnt = 1 + !!arg2;
49         PyObject *context;
50
51         if (!PyArg_UnpackTuple(args, name, 1, cnt, &context, arg2))
52                 return NULL;
53
54         return _PyCapsule_GetPointer(context, NULL);
55 }
56
57 static struct scripting_context *get_scripting_context(PyObject *args)
58 {
59         return get_args(args, "context", NULL);
60 }
61
62 #ifdef HAVE_LIBTRACEEVENT
63 static PyObject *perf_trace_context_common_pc(PyObject *obj, PyObject *args)
64 {
65         struct scripting_context *c = get_scripting_context(args);
66
67         if (!c)
68                 return NULL;
69
70         return Py_BuildValue("i", common_pc(c));
71 }
72
73 static PyObject *perf_trace_context_common_flags(PyObject *obj,
74                                                  PyObject *args)
75 {
76         struct scripting_context *c = get_scripting_context(args);
77
78         if (!c)
79                 return NULL;
80
81         return Py_BuildValue("i", common_flags(c));
82 }
83
84 static PyObject *perf_trace_context_common_lock_depth(PyObject *obj,
85                                                       PyObject *args)
86 {
87         struct scripting_context *c = get_scripting_context(args);
88
89         if (!c)
90                 return NULL;
91
92         return Py_BuildValue("i", common_lock_depth(c));
93 }
94 #endif
95
96 static PyObject *perf_sample_insn(PyObject *obj, PyObject *args)
97 {
98         struct scripting_context *c = get_scripting_context(args);
99
100         if (!c)
101                 return NULL;
102
103         if (c->sample->ip && !c->sample->insn_len && thread__maps(c->al->thread)) {
104                 struct machine *machine =  maps__machine(thread__maps(c->al->thread));
105
106                 script_fetch_insn(c->sample, c->al->thread, machine);
107         }
108         if (!c->sample->insn_len)
109                 Py_RETURN_NONE; /* N.B. This is a return statement */
110
111         return _PyBytes_FromStringAndSize(c->sample->insn, c->sample->insn_len);
112 }
113
114 static PyObject *perf_set_itrace_options(PyObject *obj, PyObject *args)
115 {
116         struct scripting_context *c;
117         const char *itrace_options;
118         int retval = -1;
119         PyObject *str;
120
121         c = get_args(args, "itrace_options", &str);
122         if (!c)
123                 return NULL;
124
125         if (!c->session || !c->session->itrace_synth_opts)
126                 goto out;
127
128         if (c->session->itrace_synth_opts->set) {
129                 retval = 1;
130                 goto out;
131         }
132
133         itrace_options = _PyUnicode_AsUTF8(str);
134
135         retval = itrace_do_parse_synth_opts(c->session->itrace_synth_opts, itrace_options, 0);
136 out:
137         return Py_BuildValue("i", retval);
138 }
139
140 static PyObject *perf_sample_src(PyObject *obj, PyObject *args, bool get_srccode)
141 {
142         struct scripting_context *c = get_scripting_context(args);
143         unsigned int line = 0;
144         char *srcfile = NULL;
145         char *srccode = NULL;
146         PyObject *result;
147         struct map *map;
148         struct dso *dso;
149         int len = 0;
150         u64 addr;
151
152         if (!c)
153                 return NULL;
154
155         map = c->al->map;
156         addr = c->al->addr;
157         dso = map ? map__dso(map) : NULL;
158
159         if (dso)
160                 srcfile = get_srcline_split(dso, map__rip_2objdump(map, addr), &line);
161
162         if (get_srccode) {
163                 if (srcfile)
164                         srccode = find_sourceline(srcfile, line, &len);
165                 result = Py_BuildValue("(sIs#)", srcfile, line, srccode, (Py_ssize_t)len);
166         } else {
167                 result = Py_BuildValue("(sI)", srcfile, line);
168         }
169
170         free(srcfile);
171
172         return result;
173 }
174
175 static PyObject *perf_sample_srcline(PyObject *obj, PyObject *args)
176 {
177         return perf_sample_src(obj, args, false);
178 }
179
180 static PyObject *perf_sample_srccode(PyObject *obj, PyObject *args)
181 {
182         return perf_sample_src(obj, args, true);
183 }
184
185 static PyMethodDef ContextMethods[] = {
186 #ifdef HAVE_LIBTRACEEVENT
187         { "common_pc", perf_trace_context_common_pc, METH_VARARGS,
188           "Get the common preempt count event field value."},
189         { "common_flags", perf_trace_context_common_flags, METH_VARARGS,
190           "Get the common flags event field value."},
191         { "common_lock_depth", perf_trace_context_common_lock_depth,
192           METH_VARARGS, "Get the common lock depth event field value."},
193 #endif
194         { "perf_sample_insn", perf_sample_insn,
195           METH_VARARGS, "Get the machine code instruction."},
196         { "perf_set_itrace_options", perf_set_itrace_options,
197           METH_VARARGS, "Set --itrace options."},
198         { "perf_sample_srcline", perf_sample_srcline,
199           METH_VARARGS, "Get source file name and line number."},
200         { "perf_sample_srccode", perf_sample_srccode,
201           METH_VARARGS, "Get source file name, line number and line."},
202         { NULL, NULL, 0, NULL}
203 };
204
205 #if PY_MAJOR_VERSION < 3
206 PyMODINIT_FUNC initperf_trace_context(void)
207 {
208         (void) Py_InitModule("perf_trace_context", ContextMethods);
209 }
210 #else
211 PyMODINIT_FUNC PyInit_perf_trace_context(void)
212 {
213         static struct PyModuleDef moduledef = {
214                 PyModuleDef_HEAD_INIT,
215                 "perf_trace_context",   /* m_name */
216                 "",                     /* m_doc */
217                 -1,                     /* m_size */
218                 ContextMethods,         /* m_methods */
219                 NULL,                   /* m_reload */
220                 NULL,                   /* m_traverse */
221                 NULL,                   /* m_clear */
222                 NULL,                   /* m_free */
223         };
224         PyObject *mod;
225
226         mod = PyModule_Create(&moduledef);
227         /* Add perf_script_context to the module so it can be imported */
228         PyObject_SetAttrString(mod, "perf_script_context", Py_None);
229
230         return mod;
231 }
232 #endif
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