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225 lines
6.5 KiB
225 lines
6.5 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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{
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NIF_ATOMS(NIF_ATOM_INIT)
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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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{
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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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}
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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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ERL_NIF_TERM tracers, value;
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ErlNifPid tracer;
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// @todo We can go one step further by having the one pid
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// in its own value in the map, skipping a get_map_value step.
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// This function will only be called for trace_status.
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// We can take a few shortcuts knowing this.
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// Disable the trace when the tracers option is missing.
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if (!enif_get_map_value(env, argv[1], atom_tracers, &tracers))
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return atom_remove;
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// Because the tracers supervisor is a one_for_all, we only need
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// to check one of the tracer processes to confirm all are alive.
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// We know for a fact that this key exists because
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// there's at least one tracer process.
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enif_get_map_value(env, tracers, enif_make_int(env, 0), &value);
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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, value, &tracer))
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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))
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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 always want both call and return_to.
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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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ERL_NIF_TERM mode;
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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_get_map_value(env, argv[1], atom_mode, &mode)
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&& enif_is_identical(atom_profile, mode)
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&& !(enif_is_identical(atom_spawn, argv[0])
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|| enif_is_identical(atom_exit, argv[0]))) {
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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 always want both in and out.
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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 always want both send and send_to_non_existing_process.
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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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ERL_NIF_TERM tracers, head, ts, extra, mspec, msg;
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ErlNifPid tracer;
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unsigned int nth;
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size_t len;
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int has_extra, has_mspec;
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if (!enif_get_map_value(env, argv[1], atom_tracers, &tracers))
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return atom_ok;
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// We know for a fact that the argument is a map. And if not,
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// no problem because we will return when trying to get a value from it.
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enif_get_map_size(env, tracers, &len);
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#if (ERL_NIF_MAJOR_VERSION >= 2) && (ERL_NIF_MINOR_VERSION >= 12)
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nth = enif_hash(ERL_NIF_INTERNAL_HASH, argv[2], 0) % len;
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#else
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// Select the correct tracer for this process.
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//
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// The pid value is detailed in:
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// 5b6dd0e84cf0f1dc19ddd05f86cf04b2695d8a9e/erts/emulator/beam/erl_term.h#L498
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//
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// As can be seen there, the first four bits of the pid value
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// are always the same. We therefore shift them out.
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ErlNifPid tracee;
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if (!enif_get_local_pid(env, argv[2], &tracee))
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return atom_ok;
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nth = (tracee.pid >> 4) % len;
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#endif
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if (!enif_get_map_value(env, tracers, enif_make_int(env, nth), &head))
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return atom_ok;
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if (!enif_get_local_pid(env, head, &tracer))
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return atom_ok;
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// Everything good. Generate a timestamp to include in the message.
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ts = enif_make_int64(env, enif_monotonic_time(ERL_NIF_USEC));
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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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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 selected tracer.
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enif_send(env, &tracer, NULL, msg);
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return atom_ok;
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}
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static ErlNifFunc nifFuns[] = {
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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_running_procs", 3, enabled_running_procs},
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{"enabled_send", 3, enabled_send},
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{"trace", 5, trace},
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};
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ERL_NIF_INIT(tpTracerNif, nifFuns, load, NULL, upgrade, unload)
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