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236 wiersze
6.9 KiB
236 wiersze
6.9 KiB
#include "erl_nif.h"
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#define NIF_ATOM_DECL(a) ERL_NIF_TERM atom_ ## a;
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// #define NIF_ATOM_H_DECL(a) extern ERL_NIF_TERM atom_ ## a;
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#define NIF_ATOM_INIT(a) atom_ ## a = enif_make_atom(env, #a);
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#define NIF_ATOMS(A) \
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A(_nif_thread_ret_) \
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A(call) \
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A(closed) \
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A(cpu_timestamp) \
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A(discard) \
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A(exception_from) \
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A(exit) \
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A(extra) \
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A(gc_major_end) \
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A(gc_major_start) \
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A(gc_minor_end) \
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A(gc_minor_start) \
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A(getting_linked) \
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A(getting_unlinked) \
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A(in) \
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A(in_exiting) \
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A(link) \
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A(match_spec_result) \
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A(mode) \
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A(monotonic) \
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A(ok) \
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A(open) \
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A(out) \
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A(out_exited) \
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A(out_exiting) \
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A(percent) \
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A(profile) \
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A(receive) \
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A(register) \
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A(remove) \
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A(return_from) \
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A(return_to) \
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A(scheduler_id) \
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A(send) \
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A(send_to_non_existing_process) \
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A(spawn) \
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A(spawned) \
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A(strict_monotonic) \
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A(timestamp) \
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A(trace) \
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A(trace_status) \
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A(tracers) \
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A(unlink) \
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A(unregister)
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NIF_ATOMS(NIF_ATOM_DECL)
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static int load(ErlNifEnv *env, void **priv_data, ERL_NIF_TERM load_info) {
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NIF_ATOMS(NIF_ATOM_INIT)
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*priv_data = NULL;
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return 0;
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}
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static int upgrade(ErlNifEnv *env, void **priv_data, void **old_priv_data, ERL_NIF_TERM load_info) {
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*priv_data = *old_priv_data;
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return 0;
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}
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static void unload(ErlNifEnv *env, void *priv_data) {
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}
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// enabled(TraceTag, TracerState, Tracee)
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static ERL_NIF_TERM enabled(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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/* Only generate trace for when tracer != tracee */
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// enif_fprintf(stdout, "IMY************enabled 000:");
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// for (int i = 0; i <= argc - 1; i++) {
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// if (i != 10) {
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// enif_fprintf(stdout, " %d %T", i, argv[i]);
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// }
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// }
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// enif_fprintf(stdout, "\n");
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if (enif_is_identical(argv[1], argv[2])) {
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return atom_discard;
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}
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ErlNifPid tracer_pid;
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// Disable the trace when one of the tracers is not a local process.
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if (!enif_get_local_pid(env, argv[1], &tracer_pid))
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return atom_remove;
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// Disable the trace when one of the tracers is not alive.
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if (!enif_is_process_alive(env, &tracer_pid))
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return atom_remove;
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return atom_discard;
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}
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static ERL_NIF_TERM enabled_call(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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// We want both call and return_to when tracer != tracee.
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// enif_fprintf(stdout, "IMY************enabled_call 000:");
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// for (int i = 0; i <= argc - 1; i++) {
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// if (i != 10) {
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// enif_fprintf(stdout, " %d %T", i, argv[i]);
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// }
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// }
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// enif_fprintf(stdout, "\n");
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if (enif_is_identical(argv[1], argv[2])) {
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return atom_discard;
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}
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return atom_trace;
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}
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static ERL_NIF_TERM enabled_procs(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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// int arity;
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// const ERL_NIF_TERM *tuple;
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// if (!enif_get_tuple(env, argv[1], &arity, &tuple)) {
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// return atom_remove;
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// }
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// // We only want the spawn and exit events when 'profile' mode
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// // is enabled. Technically we only care about exits for callgrind,
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// // but spawn is cheap to keep and useful for message profilers.
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// if (enif_is_identical(atom_profile, tuple[1]) && !(enif_is_identical(atom_spawn, argv[0]) || enif_is_identical(atom_exit, argv[0]))) {
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// return atom_discard;
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// }
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if (enif_is_identical(argv[1], argv[2])) {
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return atom_discard;
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}
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return atom_trace;
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}
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static ERL_NIF_TERM enabled_send(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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// We want both send and send_to_non_existing_process when tracer != tracee.
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if (enif_is_identical(argv[1], argv[2])) {
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return atom_discard;
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}
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return atom_trace;
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}
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static ERL_NIF_TERM enabled_receive(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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// We want receive when tracer != tracee.
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if (enif_is_identical(argv[1], argv[2])) {
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return atom_discard;
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}
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return atom_trace;
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}
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static ERL_NIF_TERM enabled_running_procs(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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// We want both in and out tracer != tracee.
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if (enif_is_identical(argv[1], argv[2])) {
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return atom_discard;
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}
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return atom_trace;
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}
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static ERL_NIF_TERM enabled_garbage_collection(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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// We want both gc_minor_start, gc_max_heap_size, and gc_minor_end tracer != tracee.
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if (enif_is_identical(argv[1], argv[2])) {
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return atom_discard;
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}
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return atom_trace;
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}
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// trace(TraceTag, TracerState, Tracee, TraceTerm, Opts)
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static ERL_NIF_TERM trace(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
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// enif_fprintf(stdout, "IMY************trace:");
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// for (int i = 0; i <= argc - 1; i++) {
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// if (i != 1) {
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// enif_fprintf(stdout, " %d %T", i, argv[i]);
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// }
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// }
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// enif_fprintf(stdout, "\n");
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int has_extra, has_mspec;
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ErlNifPid tracer_pid;
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// Disable the trace when one of the tracers is not a local process.
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if (!enif_get_local_pid(env, argv[1], &tracer_pid))
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return atom_ok;
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ERL_NIF_TERM ts, extra, mspec, msg;
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// Build the message. There can be two different messages
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// depending on whether the extra option was set:
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//
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// - {Tag, Tracee, Ts, Term}
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// - {Tag, Tracee, Ts, Term, Extra}
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//
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// On top of that when match specs are enabled we may have
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// one additional term at the end of the tuple containing
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// the result of the match spec function.
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//
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// - {Tag, Tracee, Ts, Term, Result}
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// - {Tag, Tracee, Ts, Term, Extra, Result}
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has_extra = enif_get_map_value(env, argv[4], atom_extra, &extra);
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has_mspec = enif_get_map_value(env, argv[4], atom_match_spec_result, &mspec);
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ErlNifTime mon = enif_monotonic_time(ERL_NIF_NSEC);
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ts = enif_make_int64(env, mon);
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//ts = enif_cpu_time(env);
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if (has_extra && has_mspec)
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msg = enif_make_tuple6(env, argv[0], argv[2], ts, argv[3], extra, mspec);
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else if (has_extra)
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msg = enif_make_tuple5(env, argv[0], argv[2], ts, argv[3], extra);
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else if (has_mspec)
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msg = enif_make_tuple5(env, argv[0], argv[2], ts, argv[3], mspec);
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else
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msg = enif_make_tuple4(env, argv[0], argv[2], ts, argv[3]);
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// Send the message to the tracer_pid.
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enif_send(env, &tracer_pid, NULL, msg);
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return atom_ok;
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}
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static ErlNifFunc nif_funs[] = {
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{"enabled", 3, enabled},
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{"enabled_call", 3, enabled_call},
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{"enabled_procs", 3, enabled_procs},
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{"enabled_send", 3, enabled_send},
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{"enabled_receive", 3, enabled_receive},
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{"enabled_running_procs", 3, enabled_running_procs},
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{"enabled_garbage_collection", 3, enabled_garbage_collection},
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{"trace", 5, trace},
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};
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ERL_NIF_INIT(tpTracerNif, nif_funs, load, NULL, upgrade, unload)
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