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-rw-r--r--erts/emulator/nifs/common/erl_tracer_nif.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/erts/emulator/nifs/common/erl_tracer_nif.c b/erts/emulator/nifs/common/erl_tracer_nif.c
new file mode 100644
index 0000000000..c0cc48ff42
--- /dev/null
+++ b/erts/emulator/nifs/common/erl_tracer_nif.c
@@ -0,0 +1,257 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson 2015. 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: NIF library for process/port tracer
+ *
+ */
+
+
+#define STATIC_ERLANG_NIF 1
+
+#include "erl_nif.h"
+#include "config.h"
+#include "sys.h"
+
+#ifdef VALGRIND
+# include <valgrind/memcheck.h>
+#endif
+
+/* NIF interface declarations */
+static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info);
+static int upgrade(ErlNifEnv* env, void** priv_data, void** old_priv_data, ERL_NIF_TERM load_info);
+static void unload(ErlNifEnv* env, void* priv_data);
+
+/* The NIFs: */
+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 ErlNifFunc nif_funcs[] = {
+ {"enabled", 3, enabled},
+ {"trace", 5, trace}
+};
+
+
+ERL_NIF_INIT(erl_tracer, nif_funcs, load, NULL, upgrade, unload)
+
+#define ATOMS \
+ ATOM_DECL(call); \
+ ATOM_DECL(command); \
+ ATOM_DECL(cpu_timestamp); \
+ ATOM_DECL(discard); \
+ ATOM_DECL(exception_from); \
+ ATOM_DECL(extra); \
+ ATOM_DECL(match_spec_result); \
+ ATOM_DECL(monotonic); \
+ ATOM_DECL(ok); \
+ ATOM_DECL(remove); \
+ ATOM_DECL(return_from); \
+ ATOM_DECL(scheduler_id); \
+ ATOM_DECL(send); \
+ ATOM_DECL(send_to_non_existing_process); \
+ ATOM_DECL(seq_trace); \
+ ATOM_DECL(spawn); \
+ ATOM_DECL(strict_monotonic); \
+ ATOM_DECL(timestamp); \
+ ATOM_DECL(trace); \
+ ATOM_DECL(trace_status); \
+ ATOM_DECL(trace_ts); \
+ ATOM_DECL(true); \
+ ATOM_DECL(gc_minor_start); \
+ ATOM_DECL(gc_minor_end); \
+ ATOM_DECL(gc_major_start); \
+ ATOM_DECL(gc_major_end);
+
+#define ATOM_DECL(A) static ERL_NIF_TERM atom_##A
+ATOMS
+#undef ATOM_DECL
+
+static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
+{
+
+#define ATOM_DECL(A) atom_##A = enif_make_atom(env, #A)
+ATOMS
+#undef ATOM_DECL
+
+ *priv_data = NULL;
+
+ return 0;
+}
+
+static void unload(ErlNifEnv* env, void* priv_data)
+{
+
+}
+
+static int upgrade(ErlNifEnv* env, void** priv_data, void** old_priv_data,
+ ERL_NIF_TERM load_info)
+{
+ if (*old_priv_data != NULL) {
+ return -1; /* Don't know how to do that */
+ }
+ if (*priv_data != NULL) {
+ return -1; /* Don't know how to do that */
+ }
+ if (load(env, priv_data, load_info)) {
+ return -1;
+ }
+ return 0;
+}
+
+static ERL_NIF_TERM enabled(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+ ErlNifPid to_pid;
+ ErlNifPort to_port;
+ ERL_NIF_TERM ret = enif_is_identical(argv[0], atom_trace_status) ?
+ atom_remove : atom_discard;
+
+ ASSERT(argc == 3);
+
+ if (enif_get_local_pid(env, argv[1], &to_pid)) {
+ if (!enif_is_process_alive(env, &to_pid))
+ /* tracer is dead so we should remove this trace point */
+ return ret;
+ } else if (enif_get_local_port(env, argv[1], &to_port)) {
+ if (!enif_is_port_alive(env, &to_port))
+ /* tracer is dead so we should remove this trace point */
+ return ret;
+ } else {
+ /* The state was not a pid or a port */
+ return ret;
+ }
+
+ /* Only generate trace for when tracer != tracee */
+ if (enif_is_identical(argv[1], argv[2])) {
+ return atom_discard;
+ }
+
+ return atom_trace;
+}
+
+/*
+ -spec trace(seq_trace, TracerState :: pid() | port(),
+ Label :: non_neg_integer(),
+ Msg :: term(),
+ Opts :: map()) -> ignored();
+ trace(Tag :: atom(), TracerState :: pid() | port(),
+ Tracee :: pid() || port() || undefined,
+ Msg :: term(),
+ Opts :: map()) -> ignored().
+*/
+static ERL_NIF_TERM trace(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+ ERL_NIF_TERM value, msg, tt[8], opts;
+ ErlNifPid to_pid;
+ ErlNifPort to_port;
+ size_t tt_sz = 0;
+ int is_port = 0;
+ size_t opts_sz = 0;
+ ASSERT(argc == 5);
+
+ if (!enif_get_local_pid(env, argv[1], &to_pid)) {
+ if (!enif_get_local_port(env, argv[1], &to_port)) {
+ /* This only fails if argv[1] is a not a local port/pid
+ which should not happen as it is checked in enabled */
+ ASSERT(0);
+ return atom_ok;
+ }
+ is_port = 1;
+ }
+
+ opts = argv[4];
+
+ if (!enif_get_map_size(env, opts, &opts_sz))
+ opts_sz = 0;
+
+ if (opts_sz && enif_get_map_value(env, opts, atom_extra, &value)) {
+ tt[tt_sz++] = atom_trace;
+ tt[tt_sz++] = argv[2];
+ tt[tt_sz++] = argv[0];
+ tt[tt_sz++] = argv[3];
+ tt[tt_sz++] = value;
+ } else {
+ if (enif_is_identical(argv[0], atom_seq_trace)) {
+ tt[tt_sz++] = atom_seq_trace;
+ tt[tt_sz++] = argv[2];
+ tt[tt_sz++] = argv[3];
+ } else {
+ tt[tt_sz++] = atom_trace;
+ tt[tt_sz++] = argv[2];
+ tt[tt_sz++] = argv[0];
+ tt[tt_sz++] = argv[3];
+ }
+ }
+
+
+ if (opts_sz && enif_get_map_value(env, opts, atom_match_spec_result, &value)) {
+ tt[tt_sz++] = value;
+ }
+
+ if (opts_sz && enif_get_map_value(env, opts, atom_scheduler_id, &value)) {
+ tt[tt_sz++] = value;
+ }
+
+ if (opts_sz && enif_get_map_value(env, opts, atom_timestamp, &value)) {
+ ERL_NIF_TERM ts;
+ if (enif_is_identical(value, atom_monotonic)) {
+ ErlNifTime mon = enif_monotonic_time(ERL_NIF_NSEC);
+ ts = enif_make_int64(env, mon);
+ } else if (enif_is_identical(value, atom_strict_monotonic)) {
+ ErlNifTime mon = enif_monotonic_time(ERL_NIF_NSEC);
+ ERL_NIF_TERM unique = enif_make_unique_integer(
+ env, ERL_NIF_UNIQUE_MONOTONIC);
+ ts = enif_make_tuple2(env, enif_make_int64(env, mon), unique);
+ } else if (enif_is_identical(value, atom_timestamp)) {
+ ts = enif_now_time(env);
+ } else if (enif_is_identical(value, atom_cpu_timestamp)) {
+ ts = enif_cpu_time(env);
+ } else {
+ ASSERT(0);
+ goto error;
+ }
+ tt[tt_sz++] = ts;
+ if (tt[0] == atom_trace)
+ tt[0] = atom_trace_ts;
+ }
+
+ msg = enif_make_tuple_from_array(env, tt, tt_sz);
+
+ if (is_port) {
+ ErlNifBinary bin;
+
+ if (!enif_term_to_binary(env, msg, &bin))
+ goto error;
+
+ msg = enif_make_binary(env, &bin);
+
+ if (!enif_port_command(env, &to_port, NULL, msg))
+ /* port has probably died, enabled will clean up */;
+
+ enif_release_binary(&bin);
+ } else {
+
+ if (!enif_send(env, &to_pid, NULL, msg))
+ /* process has probably died, enabled will clean up */;
+ }
+
+error:
+
+ return atom_ok;
+}