aboutsummaryrefslogtreecommitdiffstats
path: root/lib/runtime_tools/c_src/dyntrace.c
blob: 43d61266cc952455d28f09fe21937ca242772b56 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
/*
 * %CopyrightBegin%
 *
 * Copyright Scott Lystig Fritchie 2011-2016. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * %CopyrightEnd%
 */

/*
 * Purpose:  Dynamically loadable NIF library for DTrace
 */



#include "erl_nif.h"
#include "config.h"
#include "sys.h"
#include "dtrace-wrapper.h"
#if defined(USE_DYNAMIC_TRACE) && (defined(USE_DTRACE) || defined(USE_SYSTEMTAP))
#  define HAVE_USE_DTRACE 1
#endif
#if defined(USE_LTTNG)
#  define HAVE_USE_LTTNG 1
#  define TRACEPOINT_DEFINE
#  define TRACEPOINT_CREATE_PROBES
#  include "dyntrace_lttng.h"
#endif

void dtrace_nifenv_str(ErlNifEnv *env, char *process_buf);
void get_string_maybe(ErlNifEnv *env, const ERL_NIF_TERM term, char **ptr, char *buf, int bufsiz);
#ifdef HAVE_USE_DTRACE
ERL_NIF_TERM erl_nif_user_trace_s1(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
ERL_NIF_TERM erl_nif_user_trace_i4s4(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
#endif

#ifdef VALGRIND
    #  include <valgrind/memcheck.h>
#endif

#ifdef __GNUC__
    #  define INLINE __inline__
#else
    #  define INLINE
#endif

#define MESSAGE_BUFSIZ 1024

/* NIF interface declarations */
static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info);

/* The NIFs: */
static ERL_NIF_TERM available(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM user_trace_s1(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM user_trace_i4s4(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM user_trace_n(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);

static ERL_NIF_TERM enabled(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM trace(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM trace_procs(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM trace_ports(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM trace_running(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM trace_send(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM trace_receive(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM trace_garbage_collection(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);

static ErlNifFunc nif_funcs[] = {
    {"available", 0, available},
    {"user_trace_s1", 1, user_trace_s1},
    {"user_trace_i4s4", 9, user_trace_i4s4},
    {"user_trace_n", 10, user_trace_n}
    {"enabled", 3, enabled},
    {"trace", 5, trace},
    {"trace", 6, trace},
    {"trace_procs", 6, trace_procs},
    {"trace_ports", 6, trace_ports},
    {"trace_running", 6, trace_running},
    {"trace_send", 6, trace_send},
    {"trace_receive", 6, trace_receive},
    {"trace_garbage_collection", 6, trace_garbage_collection}
};

ERL_NIF_INIT(dyntrace, nif_funcs, load, NULL, NULL, NULL)

static ERL_NIF_TERM atom_true;
static ERL_NIF_TERM atom_false;
static ERL_NIF_TERM atom_error;
static ERL_NIF_TERM atom_not_available;
static ERL_NIF_TERM atom_badarg;
static ERL_NIF_TERM atom_ok;

static ERL_NIF_TERM atom_trace;
static ERL_NIF_TERM atom_remove;
static ERL_NIF_TERM atom_discard;

/* gc atoms */

static ERL_NIF_TERM atom_gc_start;
static ERL_NIF_TERM atom_gc_end;

/* process 'procs' */

static ERL_NIF_TERM atom_spawn;
static ERL_NIF_TERM atom_exit;
static ERL_NIF_TERM atom_register;
static ERL_NIF_TERM atom_unregister;
static ERL_NIF_TERM atom_link;
static ERL_NIF_TERM atom_unlink;
static ERL_NIF_TERM atom_getting_linked;
static ERL_NIF_TERM atom_getting_unlinked;

/* process 'running' and 'exiting' */

static ERL_NIF_TERM atom_in;
static ERL_NIF_TERM atom_out;
static ERL_NIF_TERM atom_in_exiting;
static ERL_NIF_TERM atom_out_exiting;
static ERL_NIF_TERM atom_out_exited;

/* process messages 'send' and 'receive' */

static ERL_NIF_TERM atom_send;
static ERL_NIF_TERM atom_receive;
static ERL_NIF_TERM atom_send_to_non_existing_process;

/* ports 'ports' */

static ERL_NIF_TERM atom_open;
static ERL_NIF_TERM atom_closed;

static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
{
    atom_true = enif_make_atom(env,"true");
    atom_false = enif_make_atom(env,"false");
    atom_error = enif_make_atom(env,"error");
    atom_not_available = enif_make_atom(env,"not_available");
    atom_badarg = enif_make_atom(env,"badarg");
    atom_ok = enif_make_atom(env,"ok");

    atom_trace = enif_make_atom(env,"trace");
    atom_remove = enif_make_atom(env,"remove");
    atom_discard = enif_make_atom(env,"discard");

    /* gc */

    atom_gc_start = enif_make_atom(env,"gc_start");
    atom_gc_end = enif_make_atom(env,"gc_end");

    /* process 'proc' */

    atom_spawn = enif_make_atom(env,"spawn");
    atom_exit = enif_make_atom(env,"exit");
    atom_register = enif_make_atom(env,"register");
    atom_unregister = enif_make_atom(env,"unregister");
    atom_link = enif_make_atom(env,"link");
    atom_unlink = enif_make_atom(env,"unlink");
    atom_getting_unlinked = enif_make_atom(env,"getting_unlinked");
    atom_getting_linked = enif_make_atom(env,"getting_linked");

    /* process 'running' and 'exiting' */

    atom_in = enif_make_atom(env,"in");
    atom_out = enif_make_atom(env,"out");
    atom_in_exiting = enif_make_atom(env,"in_exiting");
    atom_out_exiting = enif_make_atom(env,"out_exiting");
    atom_out_exited = enif_make_atom(env,"out_exited");

    /* process messages 'send' and 'receive' */

    atom_send = enif_make_atom(env,"send");
    atom_receive = enif_make_atom(env,"receive");
    atom_send_to_non_existing_process = enif_make_atom(env,"send_to_non_existing_process");

    /* ports 'ports' */

    atom_open = enif_make_atom(env,"open");
    atom_closed = enif_make_atom(env,"closed");

    return 0;
}

static ERL_NIF_TERM available(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef	HAVE_USE_DTRACE
    return atom_true;
#else
    return atom_false;
#endif
}

static ERL_NIF_TERM user_trace_s1(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef	HAVE_USE_DTRACE
    return erl_nif_user_trace_s1(env, argc, argv);
#else
    return atom_error;
#endif
}

static ERL_NIF_TERM user_trace_i4s4(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef	HAVE_USE_DTRACE
    return erl_nif_user_trace_i4s4(env, argc, argv);
#else
    return atom_error;
#endif
}

static ERL_NIF_TERM user_trace_n(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef	HAVE_USE_DTRACE
    return erl_nif_user_trace_n(env, argc, argv);
#else
    return atom_error;
#endif
}

static ERL_NIF_TERM enabled(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
    ErlNifPid to;
    ASSERT(argc == 3);
    /* Only generate trace events when probe is enabled */
    if (argv[0] == atom_seq_trace) {
        if (!erlang_trace_seq_enabled())
            return atom_discard;
    } else if (!erlang_trace_enabled()) {
        return atom_discard;
    }

    return atom_trace;
#elif HAVE_USE_LTTNG
    return atom_trace;
#endif
    return atom_remove;
}

static ERL_NIF_TERM trace(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
#define BUFF_SIZE 1024
    size_t sz = BUFF_SIZE;
    char buff[BUFF_SIZE];
    ASSERT(argc == 6);

    if (argv[0] == atom_seq_trace) {
        if (erlang_trace_seq_enabled()) {
            char *label = buff,
                *seq_info = buff + BUFF_SIZE/4;
            erts_snprintf(label, 1*BUFF_SIZE/4, "%T", argv[2]);
            erts_snprintf(seq_info, 3*BUFF_SIZE/4, "%T", argv[3]);
            erlang_trace_seq(label, seq_info);
        }
    } else {
        char *event, p[DTRACE_TERM_BUF_SIZE], state, arg1, arg2, arg3;

        event = buff + BUFF_SIZE - sz;
        sz -= enif_get_atom(env, argv[0], event, sz, ERL_NIF_LATIN1);

        state = buff + BUFF_SIZE - sz;
        sz -= erts_snprintf(state, sz, "%T", argv[1]);

        if (enif_is_pid(argv[2]) || enif_is_port(argv[2]))
            dtrace_pid_str(argv[2], p);
        else
            p = NULL;

        arg1 = buff + BUFF_SIZE - sz;
        sz -= erts_snprintf(arg1, sz, "%T", argv[3]);

        if (argc == 6) {
            arg2 = buff + BUFF_SIZE - sz;
            sz -= erts_snprintf(arg2, sz, "%T", argv[4]);
        } else
            args2 = NULL;

        erlang_trace(p, event, state, arg1, arg2);

    }
#elif HAVE_USE_LTTNG
    int i;
    erts_fprintf(stderr, "trace:\r\n");
    for (i = 0; i < argc; i++) {
        erts_fprintf(stderr, "  %T\r\n", argv[i]);
    }
#endif
    return atom_ok;
}


static ERL_NIF_TERM trace_garbage_collection(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
#elif HAVE_USE_LTTNG
    lttng_decl_procbuf(pid);

    lttng_pid_to_str(argv[2], pid);

    if (argv[0] == atom_gc_start) {
        LTTNG2(gc_minor_start, pid, 0);
    } else if (argv[0] == atom_gc_end) {
        LTTNG2(gc_minor_end, pid, 0);
    } else {
        int i;
        erts_fprintf(stderr, "trace send:\r\n");
        for (i = 0; i < argc; i++) {
            erts_fprintf(stderr, "  %T\r\n", argv[i]);
        }
    }
#endif
    return atom_ok;
}


static ERL_NIF_TERM trace_send(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
#elif HAVE_USE_LTTNG
    lttng_decl_procbuf(pid);
    lttng_pid_to_str(argv[2], pid);

    if (argv[0] == atom_send) {
        lttng_decl_procbuf(to);
        char msg[LTTNG_BUFFER_SZ];

        lttng_pid_to_str(argv[4], to);
        erts_snprintf(msg, LTTNG_BUFFER_SZ, "%T", argv[3]);

        LTTNG3(message_send, pid, to, msg);
    } else if (argv[0] == atom_send_to_non_existing_process) {
        lttng_decl_procbuf(to);
        char msg[LTTNG_BUFFER_SZ];

        lttng_pid_to_str(argv[4], to);
        erts_snprintf(msg, LTTNG_BUFFER_SZ, "%T", argv[3]);
        /* mark it as non existing ? */

        LTTNG3(message_send, pid, to, msg);
    } else {
        int i;
        erts_fprintf(stderr, "trace send:\r\n");
        for (i = 0; i < argc; i++) {
            erts_fprintf(stderr, "  %T\r\n", argv[i]);
        }
    }
#endif
    return atom_ok;
}


static ERL_NIF_TERM trace_receive(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
#elif HAVE_USE_LTTNG
    if (argv[0] == atom_receive) {
        lttng_decl_procbuf(pid);
        char msg[LTTNG_BUFFER_SZ];

        lttng_pid_to_str(argv[2], pid);
        erts_snprintf(msg, LTTNG_BUFFER_SZ, "%T", argv[3]);

        LTTNG2(message_receive, pid, msg);
    } else {
        int i;
        erts_fprintf(stderr, "trace receive:\r\n");
        for (i = 0; i < argc; i++) {
            erts_fprintf(stderr, "  %T\r\n", argv[i]);
        }
    }
#endif
    return atom_ok;
}

static ERL_NIF_TERM trace_procs(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
#define BUFF_SIZE 1024
    size_t sz = BUFF_SIZE;
    char buff[BUFF_SIZE];
    ASSERT(argc == 6);

    if (argv[0] == atom_seq_trace) {
        if (erlang_trace_seq_enabled()) {
            char *label = buff,
                *seq_info = buff + BUFF_SIZE/4;
            erts_snprintf(label, 1*BUFF_SIZE/4, "%T", argv[2]);
            erts_snprintf(seq_info, 3*BUFF_SIZE/4, "%T", argv[3]);
            erlang_trace_seq(label, seq_info);
        }
    } else {
        char *event, p[DTRACE_TERM_BUF_SIZE], state, arg1, arg2, arg3;

        event = buff + BUFF_SIZE - sz;
        sz -= enif_get_atom(env, argv[0], event, sz, ERL_NIF_LATIN1);

        state = buff + BUFF_SIZE - sz;
        sz -= erts_snprintf(state, sz, "%T", argv[1]);

        if (enif_is_pid(argv[2]) || enif_is_port(argv[2]))
            dtrace_pid_str(argv[2], p);
        else
            p = NULL;

        arg1 = buff + BUFF_SIZE - sz;
        sz -= erts_snprintf(arg1, sz, "%T", argv[3]);

        if (argc == 6) {
            arg2 = buff + BUFF_SIZE - sz;
            sz -= erts_snprintf(arg2, sz, "%T", argv[4]);
        } else
            args2 = NULL;

        erlang_trace(p, event, state, arg1, arg2);

    }
#elif HAVE_USE_LTTNG
    lttng_decl_procbuf(pid);
    lttng_decl_procbuf(to);

    lttng_pid_to_str(argv[2], pid);

    /* spawn */
    if (argv[0] == atom_spawn) {
        char undef[] = "undefined";
        const ERL_NIF_TERM* tuple;
        int arity;
        unsigned int len;
        lttng_decl_mfabuf(mfa);

        lttng_pid_to_str(argv[3], to);

        if (enif_get_tuple(env, argv[4], &arity, &tuple)) {
            enif_get_list_length(env, tuple[2], &len);
            lttng_mfa_to_str(tuple[0], tuple[1], len, mfa);
            LTTNG3(process_spawn, to, pid, mfa);
        } else {
            LTTNG3(process_spawn, to, pid, undef);
        }

    /* register */
    } else if (argv[0] == atom_register) {
        char name[LTTNG_BUFFER_SZ];
        erts_snprintf(name, LTTNG_BUFFER_SZ, "%T", argv[3]);
        LTTNG3(process_register, pid, name, "register");
    } else if (argv[0] == atom_unregister) {
        char name[LTTNG_BUFFER_SZ];
        erts_snprintf(name, LTTNG_BUFFER_SZ, "%T", argv[3]);
        LTTNG3(process_register, pid, name, "unregister");
    /* link */
    } else if (argv[0] == atom_link) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(process_link, pid, to, "link");
    } else if (argv[0] == atom_unlink) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(process_link, pid, to, "unlink");
    } else if (argv[0] == atom_getting_linked) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(process_link, to, pid, "link");
    } else if (argv[0] == atom_getting_unlinked) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(process_link, to, pid, "unlink");
    /* exit */
    } else if (argv[0] == atom_exit) {
        char reason[LTTNG_BUFFER_SZ];
        erts_snprintf(reason, LTTNG_BUFFER_SZ, "%T", argv[3]);
        LTTNG2(process_exit, pid, reason);
    } else {
        int i;
        erts_fprintf(stderr, "proc trace:\r\n");
        for (i = 0; i < argc; i++) {
            erts_fprintf(stderr, "  %T\r\n", argv[i]);
        }
    }
#endif
    return atom_ok;
}

static ERL_NIF_TERM trace_ports(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
#elif HAVE_USE_LTTNG
    lttng_decl_portbuf(port);
    lttng_decl_procbuf(to);

    lttng_portid_to_str(argv[2], port);

    /* open and closed */
    if (argv[0] == atom_open) {
        char driver[LTTNG_BUFFER_SZ];
        lttng_decl_procbuf(pid);
        lttng_pid_to_str(argv[3], pid);

        erts_snprintf(driver, LTTNG_BUFFER_SZ, "%T", argv[4]);
        LTTNG3(port_open, pid, driver, port);
    } else if (argv[0] == atom_closed) {
        char reason[LTTNG_BUFFER_SZ];
        erts_snprintf(reason, LTTNG_BUFFER_SZ, "%T", argv[3]);

        LTTNG2(port_exit, port, reason);
    /* link */
    } else if (argv[0] == atom_link) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(port_link, port, to, "link");
    } else if (argv[0] == atom_unlink) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(port_link, port, to, "unlink");
    } else if (argv[0] == atom_getting_linked) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(port_link, to, port, "link");
    } else if (argv[0] == atom_getting_unlinked) {
        lttng_pid_to_str(argv[3], to);
        LTTNG3(port_link, to, port, "unlink");
    } else {
        int i;
        erts_fprintf(stderr, "ports trace:\r\n");
        for (i = 0; i < argc; i++) {
            erts_fprintf(stderr, "  %T\r\n", argv[i]);
        }
    }
#endif
    return atom_ok;
}


static ERL_NIF_TERM trace_running(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_USE_DTRACE
#elif HAVE_USE_LTTNG
    lttng_decl_procbuf(pid);
    const ERL_NIF_TERM* tuple;
    char *mfastr = "undefined";
    int arity;

    lttng_pid_to_str(argv[2], pid);
    lttng_decl_mfabuf(mfa);

    if (enif_get_tuple(env, argv[3], &arity, &tuple)) {
        int val;
        enif_get_int(env, tuple[2], &val);
        lttng_mfa_to_str(tuple[0], tuple[1], val, mfa);
        mfastr = mfa;
    }

    /* running */
    if (argv[0] == atom_in) {
        LTTNG3(process_scheduled, pid, mfastr, "in");
    } else if (argv[0] == atom_out) {
        LTTNG3(process_scheduled, pid, mfastr, "out");
    /* exiting */
    } else if (argv[0] == atom_in_exiting) {
        LTTNG3(process_scheduled, pid, mfastr, "in_exiting");
    } else if (argv[0] == atom_out_exiting) {
        LTTNG3(process_scheduled, pid, mfastr, "out_exiting");
    } else if (argv[0] == atom_out_exited) {
        LTTNG3(process_scheduled, pid, mfastr, "out_exited");
    }
#endif
    return atom_ok;
}