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/*
* %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_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_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;
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");
atom_gc_start = enif_make_atom(env,"gc_start");
atom_gc_end = enif_make_atom(env,"gc_end");
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
/*
int i;
erts_fprintf(stderr, "enabled:\r\n");
for (i = 0; i < argc; i++) {
erts_fprintf(stderr, " %T\r\n", argv[i]);
}
*/
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_receive(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_send(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_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
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;
}
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