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erl_bif_trace.c
2401 lines (2191 loc) · 61.6 KB
/
erl_bif_trace.c
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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1999-2013. 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%
*/
/*
* Trace BIFs.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "erl_driver.h"
#include "bif.h"
#include "big.h"
#include "dist.h"
#include "erl_version.h"
#include "beam_bp.h"
#include "erl_binary.h"
#include "erl_thr_progress.h"
#include "erl_bif_unique.h"
#define DECL_AM(S) Eterm AM_ ## S = am_atom_put(#S, sizeof(#S) - 1)
const struct trace_pattern_flags erts_trace_pattern_flags_off = {0, 0, 0, 0, 0};
/*
* The following variables are protected by code write permission.
*/
static int erts_default_trace_pattern_is_on;
static Binary *erts_default_match_spec;
static Binary *erts_default_meta_match_spec;
static struct trace_pattern_flags erts_default_trace_pattern_flags;
static Eterm erts_default_meta_tracer_pid;
static struct { /* Protected by code write permission */
int current;
int install;
int local;
BpFunctions f; /* Local functions */
BpFunctions e; /* Export entries */
#ifdef ERTS_SMP
Process* stager;
ErtsThrPrgrLaterOp lop;
#endif
} finish_bp;
static Eterm
trace_pattern(Process* p, Eterm MFA, Eterm Pattern, Eterm flaglist);
#ifdef ERTS_SMP
static void smp_bp_finisher(void* arg);
#endif
static BIF_RETTYPE
system_monitor(Process *p, Eterm monitor_pid, Eterm list);
static void new_seq_trace_token(Process* p); /* help func for seq_trace_2*/
static int already_traced(Process *p, Process *tracee_p, Eterm tracer);
static int port_already_traced(Process *p, Port *tracee_port, Eterm tracer);
static Eterm trace_info_pid(Process* p, Eterm pid_spec, Eterm key);
static Eterm trace_info_func(Process* p, Eterm pid_spec, Eterm key);
static Eterm trace_info_on_load(Process* p, Eterm key);
static void reset_bif_trace(void);
static void setup_bif_trace(void);
static void install_exp_breakpoints(BpFunctions* f);
static void uninstall_exp_breakpoints(BpFunctions* f);
static void clean_export_entries(BpFunctions* f);
void
erts_bif_trace_init(void)
{
erts_default_trace_pattern_is_on = 0;
erts_default_match_spec = NULL;
erts_default_meta_match_spec = NULL;
erts_default_trace_pattern_flags = erts_trace_pattern_flags_off;
erts_default_meta_tracer_pid = NIL;
}
/*
* Turn on/off call tracing for the given function(s).
*/
Eterm
trace_pattern_2(BIF_ALIST_2)
{
return trace_pattern(BIF_P, BIF_ARG_1, BIF_ARG_2, NIL);
}
Eterm
trace_pattern_3(BIF_ALIST_3)
{
return trace_pattern(BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);
}
static Eterm
trace_pattern(Process* p, Eterm MFA, Eterm Pattern, Eterm flaglist)
{
DeclareTmpHeap(mfa,3,p); /* Not really heap here, but might be when setting pattern */
int i;
int matches = -1;
int specified = 0;
enum erts_break_op on;
Binary* match_prog_set;
Eterm l;
struct trace_pattern_flags flags = erts_trace_pattern_flags_off;
int is_global;
Process *meta_tracer_proc = p;
Eterm meta_tracer_pid = p->common.id;
if (!erts_try_seize_code_write_permission(p)) {
ERTS_BIF_YIELD3(bif_export[BIF_trace_pattern_3], p, MFA, Pattern, flaglist);
}
finish_bp.current = -1;
UseTmpHeap(3,p);
/*
* Check and compile the match specification.
*/
if (Pattern == am_false) {
match_prog_set = NULL;
on = 0;
} else if (is_nil(Pattern) || Pattern == am_true) {
match_prog_set = NULL;
on = 1;
} else if (Pattern == am_restart) {
match_prog_set = NULL;
on = erts_break_reset;
} else if (Pattern == am_pause) {
match_prog_set = NULL;
on = erts_break_stop;
} else if ((match_prog_set = erts_match_set_compile(p, Pattern)) != NULL) {
MatchSetRef(match_prog_set);
on = 1;
} else{
goto error;
}
is_global = 0;
for(l = flaglist; is_list(l); l = CDR(list_val(l))) {
if (is_tuple(CAR(list_val(l)))) {
Eterm *tp = tuple_val(CAR(list_val(l)));
if (arityval(tp[0]) != 2 || tp[1] != am_meta) {
goto error;
}
meta_tracer_pid = tp[2];
if (is_internal_pid(meta_tracer_pid)) {
meta_tracer_proc = erts_pid2proc(NULL, 0, meta_tracer_pid, 0);
if (!meta_tracer_proc) {
goto error;
}
} else if (is_internal_port(meta_tracer_pid)) {
Port *meta_tracer_port;
meta_tracer_proc = NULL;
meta_tracer_port = (erts_port_lookup(
meta_tracer_pid,
ERTS_PORT_SFLGS_INVALID_TRACER_LOOKUP));
if (!meta_tracer_port)
goto error;
} else {
goto error;
}
if (is_global) {
goto error;
}
flags.breakpoint = 1;
flags.meta = 1;
} else {
switch (CAR(list_val(l))) {
case am_local:
if (is_global) {
goto error;
}
flags.breakpoint = 1;
flags.local = 1;
break;
case am_meta:
if (is_global) {
goto error;
}
flags.breakpoint = 1;
flags.meta = 1;
break;
case am_global:
if (flags.breakpoint) {
goto error;
}
is_global = !0;
break;
case am_call_count:
if (is_global) {
goto error;
}
flags.breakpoint = 1;
flags.call_count = 1;
break;
case am_call_time:
if (is_global) {
goto error;
}
flags.breakpoint = 1;
flags.call_time = 1;
break;
default:
goto error;
}
}
}
if (l != NIL) {
goto error;
}
if (match_prog_set && !flags.local && !flags.meta && (flags.call_count || flags.call_time)) {
/* A match prog is not allowed with just call_count or call_time*/
goto error;
}
/*
* Check the MFA specification.
*/
if (MFA == am_on_load) {
if (flags.local || (! flags.breakpoint)) {
MatchSetUnref(erts_default_match_spec);
erts_default_match_spec = match_prog_set;
MatchSetRef(erts_default_match_spec);
}
if (flags.meta) {
MatchSetUnref(erts_default_meta_match_spec);
erts_default_meta_match_spec = match_prog_set;
MatchSetRef(erts_default_meta_match_spec);
erts_default_meta_tracer_pid = meta_tracer_pid;
if (meta_tracer_proc) {
ERTS_TRACE_FLAGS(meta_tracer_proc) |= F_TRACER;
}
} else if (! flags.breakpoint) {
MatchSetUnref(erts_default_meta_match_spec);
erts_default_meta_match_spec = NULL;
erts_default_meta_tracer_pid = NIL;
}
if (erts_default_trace_pattern_flags.breakpoint &&
flags.breakpoint) {
/* Breakpoint trace -> breakpoint trace */
ASSERT(erts_default_trace_pattern_is_on);
if (on) {
erts_default_trace_pattern_flags.local
|= flags.local;
erts_default_trace_pattern_flags.meta
|= flags.meta;
erts_default_trace_pattern_flags.call_count
|= (on == 1) ? flags.call_count : 0;
erts_default_trace_pattern_flags.call_time
|= (on == 1) ? flags.call_time : 0;
} else {
erts_default_trace_pattern_flags.local
&= ~flags.local;
erts_default_trace_pattern_flags.meta
&= ~flags.meta;
erts_default_trace_pattern_flags.call_count
&= ~flags.call_count;
erts_default_trace_pattern_flags.call_time
&= ~flags.call_time;
if (! (erts_default_trace_pattern_flags.breakpoint =
erts_default_trace_pattern_flags.local |
erts_default_trace_pattern_flags.meta |
erts_default_trace_pattern_flags.call_count |
erts_default_trace_pattern_flags.call_time)) {
erts_default_trace_pattern_is_on = !!on; /* i.e off */
}
}
} else if (! erts_default_trace_pattern_flags.breakpoint &&
! flags.breakpoint) {
/* Global call trace -> global call trace */
erts_default_trace_pattern_is_on = !!on;
} else if (erts_default_trace_pattern_flags.breakpoint &&
! flags.breakpoint) {
/* Breakpoint trace -> global call trace */
if (on) {
erts_default_trace_pattern_flags = flags; /* Struct copy */
erts_default_trace_pattern_is_on = !!on;
}
} else {
ASSERT(! erts_default_trace_pattern_flags.breakpoint &&
flags.breakpoint);
/* Global call trace -> breakpoint trace */
if (on) {
if (on != 1) {
flags.call_count = 0;
flags.call_time = 0;
}
flags.breakpoint = flags.local | flags.meta | flags.call_count | flags.call_time;
erts_default_trace_pattern_flags = flags; /* Struct copy */
erts_default_trace_pattern_is_on = !!flags.breakpoint;
}
}
matches = 0;
} else if (is_tuple(MFA)) {
Eterm *tp = tuple_val(MFA);
if (tp[0] != make_arityval(3)) {
goto error;
}
mfa[0] = tp[1];
mfa[1] = tp[2];
mfa[2] = tp[3];
if (!is_atom(mfa[0]) || !is_atom(mfa[1]) ||
(!is_small(mfa[2]) && mfa[2] != am_Underscore)) {
goto error;
}
for (i = 0; i < 3 && mfa[i] != am_Underscore; i++, specified++) {
/* Empty loop body */
}
for (i = specified; i < 3; i++) {
if (mfa[i] != am_Underscore) {
goto error;
}
}
if (is_small(mfa[2])) {
mfa[2] = signed_val(mfa[2]);
}
if (meta_tracer_proc) {
ERTS_TRACE_FLAGS(meta_tracer_proc) |= F_TRACER;
}
matches = erts_set_trace_pattern(p, mfa, specified,
match_prog_set, match_prog_set,
on, flags, meta_tracer_pid, 0);
}
error:
MatchSetUnref(match_prog_set);
UnUseTmpHeap(3,p);
#ifdef ERTS_SMP
if (finish_bp.current >= 0) {
ASSERT(matches >= 0);
ASSERT(finish_bp.stager == NULL);
finish_bp.stager = p;
erts_schedule_thr_prgr_later_op(smp_bp_finisher, NULL, &finish_bp.lop);
erts_proc_inc_refc(p);
erts_suspend(p, ERTS_PROC_LOCK_MAIN, NULL);
ERTS_BIF_YIELD_RETURN(p, make_small(matches));
}
#endif
erts_release_code_write_permission();
if (matches >= 0) {
return make_small(matches);
}
else {
BIF_ERROR(p, BADARG);
}
}
#ifdef ERTS_SMP
static void smp_bp_finisher(void* null)
{
if (erts_finish_breakpointing()) { /* Not done */
/* Arrange for being called again */
erts_schedule_thr_prgr_later_op(smp_bp_finisher, NULL, &finish_bp.lop);
}
else { /* Done */
Process* p = finish_bp.stager;
#ifdef DEBUG
finish_bp.stager = NULL;
#endif
erts_release_code_write_permission();
erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(p)) {
erts_resume(p, ERTS_PROC_LOCK_STATUS);
}
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS);
erts_proc_dec_refc(p);
}
}
#endif /* ERTS_SMP */
void
erts_get_default_trace_pattern(int *trace_pattern_is_on,
Binary **match_spec,
Binary **meta_match_spec,
struct trace_pattern_flags *trace_pattern_flags,
Eterm *meta_tracer_pid)
{
ERTS_SMP_LC_ASSERT(erts_has_code_write_permission() ||
erts_smp_thr_progress_is_blocking());
if (trace_pattern_is_on)
*trace_pattern_is_on = erts_default_trace_pattern_is_on;
if (match_spec)
*match_spec = erts_default_match_spec;
if (meta_match_spec)
*meta_match_spec = erts_default_meta_match_spec;
if (trace_pattern_flags)
*trace_pattern_flags = erts_default_trace_pattern_flags;
if (meta_tracer_pid)
*meta_tracer_pid = erts_default_meta_tracer_pid;
}
int erts_is_default_trace_enabled(void)
{
ERTS_SMP_LC_ASSERT(erts_has_code_write_permission() ||
erts_smp_thr_progress_is_blocking());
return erts_default_trace_pattern_is_on;
}
Uint
erts_trace_flag2bit(Eterm flag)
{
switch (flag) {
case am_timestamp: return F_NOW_TS;
case am_strict_monotonic_timestamp: return F_STRICT_MON_TS;
case am_monotonic_timestamp: return F_MON_TS;
case am_all: return TRACEE_FLAGS;
case am_send: return F_TRACE_SEND;
case am_receive: return F_TRACE_RECEIVE;
case am_set_on_spawn: return F_TRACE_SOS;
case am_procs: return F_TRACE_PROCS;
case am_set_on_first_spawn: return F_TRACE_SOS1;
case am_set_on_link: return F_TRACE_SOL;
case am_set_on_first_link: return F_TRACE_SOL1;
case am_running: return F_TRACE_SCHED;
case am_exiting: return F_TRACE_SCHED_EXIT;
case am_garbage_collection: return F_TRACE_GC;
case am_call: return F_TRACE_CALLS;
case am_arity: return F_TRACE_ARITY_ONLY;
case am_return_to: return F_TRACE_RETURN_TO;
case am_silent: return F_TRACE_SILENT;
case am_scheduler_id: return F_TRACE_SCHED_NO;
case am_running_ports: return F_TRACE_SCHED_PORTS;
case am_running_procs: return F_TRACE_SCHED_PROCS;
case am_ports: return F_TRACE_PORTS;
default: return 0;
}
}
/* Scan the argument list and sort out the trace flags.
**
** Returns !0 on success, 0 on failure.
**
** Sets the result variables on success, if their flags has
** occurred in the argument list.
*/
int
erts_trace_flags(Eterm List,
Uint *pMask, Eterm *pTracer, int *pCpuTimestamp)
{
Eterm list = List;
Uint mask = 0;
Eterm tracer = NIL;
int cpu_timestamp = 0;
while (is_list(list)) {
Uint bit;
Eterm item = CAR(list_val(list));
if (is_atom(item) && (bit = erts_trace_flag2bit(item))) {
mask |= bit;
#ifdef HAVE_ERTS_NOW_CPU
} else if (item == am_cpu_timestamp) {
cpu_timestamp = !0;
#endif
} else if (is_tuple(item)) {
Eterm* tp = tuple_val(item);
if (arityval(tp[0]) != 2 || tp[1] != am_tracer) goto error;
if (is_internal_pid(tp[2]) || is_internal_port(tp[2])) {
tracer = tp[2];
} else goto error;
} else goto error;
list = CDR(list_val(list));
}
if (is_not_nil(list)) goto error;
if (pMask && mask) *pMask = mask;
if (pTracer && tracer != NIL) *pTracer = tracer;
if (pCpuTimestamp && cpu_timestamp) *pCpuTimestamp = cpu_timestamp;
return !0;
error:
return 0;
}
Eterm trace_3(BIF_ALIST_3)
{
Process* p = BIF_P;
Eterm pid_spec = BIF_ARG_1;
Eterm how = BIF_ARG_2;
Eterm list = BIF_ARG_3;
int on;
Eterm tracer = NIL;
int matches = 0;
Uint mask = 0;
int cpu_ts = 0;
#ifdef ERTS_SMP
int system_blocked = 0;
#endif
if (! erts_trace_flags(list, &mask, &tracer, &cpu_ts)) {
BIF_ERROR(p, BADARG);
}
if (!erts_try_seize_code_write_permission(BIF_P)) {
ERTS_BIF_YIELD3(bif_export[BIF_trace_3], BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);
}
if (is_nil(tracer) || is_internal_pid(tracer)) {
Process *tracer_proc = erts_pid2proc(p,
ERTS_PROC_LOCK_MAIN,
is_nil(tracer) ? p->common.id : tracer,
ERTS_PROC_LOCKS_ALL);
if (!tracer_proc)
goto error;
ERTS_TRACE_FLAGS(tracer_proc) |= F_TRACER;
erts_smp_proc_unlock(tracer_proc,
(tracer_proc == p
? ERTS_PROC_LOCKS_ALL_MINOR
: ERTS_PROC_LOCKS_ALL));
} else if (is_internal_port(tracer)) {
Port *tracer_port = erts_id2port_sflgs(tracer,
p,
ERTS_PROC_LOCK_MAIN,
ERTS_PORT_SFLGS_INVALID_TRACER_LOOKUP);
if (!tracer_port)
goto error;
ERTS_TRACE_FLAGS(tracer_port) |= F_TRACER;
erts_port_release(tracer_port);
} else
goto error;
switch (how) {
case am_false:
on = 0;
break;
case am_true:
on = 1;
if (is_nil(tracer))
tracer = p->common.id;
break;
default:
goto error;
}
/*
* Set/reset the call trace flag for the given Pids.
*/
if (is_port(pid_spec)) {
Port *tracee_port;
#ifdef HAVE_ERTS_NOW_CPU
if (cpu_ts) {
goto error;
}
#endif
if (pid_spec == tracer)
goto error;
tracee_port = erts_id2port_sflgs(pid_spec,
p,
ERTS_PROC_LOCK_MAIN,
ERTS_PORT_SFLGS_INVALID_LOOKUP);
if (!tracee_port)
goto error;
if (tracer != NIL && port_already_traced(p, tracee_port, tracer)) {
erts_port_release(tracee_port);
goto already_traced;
}
if (on)
ERTS_TRACE_FLAGS(tracee_port) |= mask;
else
ERTS_TRACE_FLAGS(tracee_port) &= ~mask;
if (!ERTS_TRACE_FLAGS(tracee_port))
ERTS_TRACER_PROC(tracee_port) = NIL;
else if (tracer != NIL)
ERTS_TRACER_PROC(tracee_port) = tracer;
erts_port_release(tracee_port);
matches = 1;
} else if (is_pid(pid_spec)) {
Process *tracee_p;
#ifdef HAVE_ERTS_NOW_CPU
if (cpu_ts) {
goto error;
}
#endif
/* Check that the tracee is not dead, not tracing
* and not about to be tracing.
*/
if (pid_spec == tracer)
goto error;
tracee_p = erts_pid2proc(p, ERTS_PROC_LOCK_MAIN,
pid_spec, ERTS_PROC_LOCKS_ALL);
if (!tracee_p)
goto error;
if (tracer != NIL && already_traced(p, tracee_p, tracer)) {
erts_smp_proc_unlock(tracee_p,
(tracee_p == p
? ERTS_PROC_LOCKS_ALL_MINOR
: ERTS_PROC_LOCKS_ALL));
goto already_traced;
}
if (on)
ERTS_TRACE_FLAGS(tracee_p) |= mask;
else
ERTS_TRACE_FLAGS(tracee_p) &= ~mask;
if ((ERTS_TRACE_FLAGS(tracee_p) & TRACEE_FLAGS) == 0)
ERTS_TRACER_PROC(tracee_p) = NIL;
else if (tracer != NIL)
ERTS_TRACER_PROC(tracee_p) = tracer;
erts_smp_proc_unlock(tracee_p,
(tracee_p == p
? ERTS_PROC_LOCKS_ALL_MINOR
: ERTS_PROC_LOCKS_ALL));
matches = 1;
} else {
int ok = 0;
#ifdef HAVE_ERTS_NOW_CPU
if (cpu_ts) {
if (pid_spec == am_all) {
if (on) {
if (!erts_cpu_timestamp) {
#ifdef HAVE_CLOCK_GETTIME_CPU_TIME
/*
Perhaps clock_gettime was found during config
on a different machine than this. We check
if it works here and now, then don't bother
about checking return value for error later.
*/
{
SysCpuTime start, stop;
SysTimespec tp;
int i;
if (sys_get_proc_cputime(start, tp) < 0)
goto error;
start = ((SysCpuTime)tp.tv_sec * 1000000000LL) +
(SysCpuTime)tp.tv_nsec;
for (i = 0; i < 100; i++)
sys_get_proc_cputime(stop, tp);
stop = ((SysCpuTime)tp.tv_sec * 1000000000LL) +
(SysCpuTime)tp.tv_nsec;
if (start == 0) goto error;
if (start == stop) goto error;
}
#else /* HAVE_GETHRVTIME */
if (erts_start_now_cpu() < 0) {
goto error;
}
#endif /* HAVE_CLOCK_GETTIME_CPU_TIME */
erts_cpu_timestamp = !0;
}
}
} else {
goto error;
}
}
#endif
if (pid_spec == am_all || pid_spec == am_existing) {
int i;
int procs = 0;
int ports = 0;
int mods = 0;
if (mask & (ERTS_PROC_TRACEE_FLAGS & ~ERTS_TRACEE_MODIFIER_FLAGS))
procs = 1;
if (mask & (ERTS_PORT_TRACEE_FLAGS & ~ERTS_TRACEE_MODIFIER_FLAGS))
ports = 1;
if (mask & ERTS_TRACEE_MODIFIER_FLAGS)
mods = 1;
#ifdef ERTS_SMP
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN);
erts_smp_thr_progress_block();
system_blocked = 1;
#endif
ok = 1;
if (procs || mods) {
int max = erts_ptab_max(&erts_proc);
/* tracing of processes */
for (i = 0; i < max; i++) {
Process* tracee_p = erts_pix2proc(i);
if (! tracee_p)
continue;
if (tracer != NIL) {
if (tracee_p->common.id == tracer)
continue;
if (already_traced(NULL, tracee_p, tracer))
continue;
}
if (on) {
ERTS_TRACE_FLAGS(tracee_p) |= mask;
} else {
ERTS_TRACE_FLAGS(tracee_p) &= ~mask;
}
if(!(ERTS_TRACE_FLAGS(tracee_p) & TRACEE_FLAGS)) {
ERTS_TRACER_PROC(tracee_p) = NIL;
} else if (tracer != NIL) {
ERTS_TRACER_PROC(tracee_p) = tracer;
}
matches++;
}
}
if (ports || mods) {
int max = erts_ptab_max(&erts_port);
/* tracing of ports */
for (i = 0; i < max; i++) {
erts_aint32_t state;
Port *tracee_port = erts_pix2port(i);
if (!tracee_port)
continue;
state = erts_atomic32_read_nob(&tracee_port->state);
if (state & ERTS_PORT_SFLGS_DEAD)
continue;
if (tracer != NIL) {
if (tracee_port->common.id == tracer)
continue;
if (port_already_traced(NULL, tracee_port, tracer))
continue;
}
if (on) ERTS_TRACE_FLAGS(tracee_port) |= mask;
else ERTS_TRACE_FLAGS(tracee_port) &= ~mask;
if (!(ERTS_TRACE_FLAGS(tracee_port) & TRACEE_FLAGS)) {
ERTS_TRACER_PROC(tracee_port) = NIL;
} else if (tracer != NIL) {
ERTS_TRACER_PROC(tracee_port) = tracer;
}
/* matches are not counted for ports since it would violate compatibility */
/* This could be a reason to modify this function or make a new one. */
}
}
}
if (pid_spec == am_all || pid_spec == am_new) {
Uint def_flags = mask;
Eterm def_tracer = tracer;
ok = 1;
erts_change_default_tracing(on, &def_flags, &def_tracer);
#ifdef HAVE_ERTS_NOW_CPU
if (cpu_ts && !on) {
/* cpu_ts => pid_spec == am_all */
if (erts_cpu_timestamp) {
#ifdef HAVE_GETHRVTIME
erts_stop_now_cpu();
#endif
erts_cpu_timestamp = 0;
}
}
#endif
}
if (!ok)
goto error;
}
#ifdef ERTS_SMP
if (system_blocked) {
erts_smp_thr_progress_unblock();
erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN);
}
#endif
erts_release_code_write_permission();
BIF_RET(make_small(matches));
already_traced:
erts_send_error_to_logger_str(p->group_leader,
"** can only have one tracer per process\n");
error:
#ifdef ERTS_SMP
if (system_blocked) {
erts_smp_thr_progress_unblock();
erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN);
}
#endif
erts_release_code_write_permission();
BIF_ERROR(p, BADARG);
}
/* Check that the process to be traced is not already traced
* by a valid other tracer than the tracer to be.
*/
static int port_already_traced(Process *c_p, Port *tracee_port, Eterm tracer)
{
/*
* SMP build assumes that either system is blocked or:
* * main lock is held on c_p
* * all locks are held on port tracee_p
*/
if ((ERTS_TRACE_FLAGS(tracee_port) & TRACEE_FLAGS)
&& ERTS_TRACER_PROC(tracee_port) != tracer) {
/* This tracee is already being traced, and not by the
* tracer to be */
if (is_internal_port(ERTS_TRACER_PROC(tracee_port))) {
if (!erts_is_valid_tracer_port(ERTS_TRACER_PROC(tracee_port))) {
/* Current trace port now invalid
* - discard it and approve the new. */
goto remove_tracer;
} else
return 1;
}
else if(is_internal_pid(ERTS_TRACER_PROC(tracee_port))) {
Process *tracer_p = erts_proc_lookup(ERTS_TRACER_PROC(tracee_port));
if (!tracer_p) {
/* Current trace process now invalid
* - discard it and approve the new. */
goto remove_tracer;
} else
return 1;
}
else {
remove_tracer:
ERTS_TRACE_FLAGS(tracee_port) &= ~TRACEE_FLAGS;
ERTS_TRACER_PROC(tracee_port) = NIL;
}
}
return 0;
}
/* Check that the process to be traced is not already traced
* by a valid other tracer than the tracer to be.
*/
static int already_traced(Process *c_p, Process *tracee_p, Eterm tracer)
{
/*
* SMP build assumes that either system is blocked or:
* * main lock is held on c_p
* * all locks multiple are held on tracee_p
*/
if ((ERTS_TRACE_FLAGS(tracee_p) & TRACEE_FLAGS)
&& ERTS_TRACER_PROC(tracee_p) != tracer) {
/* This tracee is already being traced, and not by the
* tracer to be */
if (is_internal_port(ERTS_TRACER_PROC(tracee_p))) {
if (!erts_is_valid_tracer_port(ERTS_TRACER_PROC(tracee_p))) {
/* Current trace port now invalid
* - discard it and approve the new. */
goto remove_tracer;
} else
return 1;
}
else if(is_internal_pid(ERTS_TRACER_PROC(tracee_p))) {
Process *tracer_p;
tracer_p = erts_proc_lookup(ERTS_TRACER_PROC(tracee_p));
if (!tracer_p) {
/* Current trace process now invalid
* - discard it and approve the new. */
goto remove_tracer;
} else
return 1;
}
else {
remove_tracer:
ERTS_TRACE_FLAGS(tracee_p) &= ~TRACEE_FLAGS;
ERTS_TRACER_PROC(tracee_p) = NIL;
}
}
return 0;
}
/*
* Return information about a process or an external function being traced.
*/
Eterm trace_info_2(BIF_ALIST_2)
{
Process* p = BIF_P;
Eterm What = BIF_ARG_1;
Eterm Key = BIF_ARG_2;
Eterm res;
if (!erts_try_seize_code_write_permission(p)) {
ERTS_BIF_YIELD2(bif_export[BIF_trace_info_2], p, What, Key);
}
if (What == am_on_load) {
res = trace_info_on_load(p, Key);
} else if (is_atom(What) || is_pid(What)) {
res = trace_info_pid(p, What, Key);
} else if (is_tuple(What)) {
res = trace_info_func(p, What, Key);
} else {
erts_release_code_write_permission();
BIF_ERROR(p, BADARG);
}
erts_release_code_write_permission();
BIF_RET(res);
}
static Eterm
trace_info_pid(Process* p, Eterm pid_spec, Eterm key)
{
Eterm tracer;
Uint trace_flags;
Eterm* hp;
if (pid_spec == am_new) {
erts_get_default_tracing(&trace_flags, &tracer);
} else if (is_internal_pid(pid_spec)) {
Process *tracee;
tracee = erts_pid2proc(p, ERTS_PROC_LOCK_MAIN,
pid_spec, ERTS_PROC_LOCKS_ALL);
if (!tracee) {
return am_undefined;
} else {
tracer = ERTS_TRACER_PROC(tracee);
trace_flags = ERTS_TRACE_FLAGS(tracee);
}
if (is_internal_pid(tracer)) {
if (!erts_proc_lookup(tracer)) {
reset_tracer:
ERTS_TRACE_FLAGS(tracee) &= ~TRACEE_FLAGS;
trace_flags = ERTS_TRACE_FLAGS(tracee);
tracer = ERTS_TRACER_PROC(tracee) = NIL;
}
}
else if (is_internal_port(tracer)) {
if (!erts_is_valid_tracer_port(tracer))
goto reset_tracer;
}
#ifdef ERTS_SMP
erts_smp_proc_unlock(tracee,
(tracee == p
? ERTS_PROC_LOCKS_ALL_MINOR
: ERTS_PROC_LOCKS_ALL));
#endif
} else if (is_external_pid(pid_spec)
&& external_pid_dist_entry(pid_spec) == erts_this_dist_entry) {
return am_undefined;
} else {
error:
BIF_ERROR(p, BADARG);
}
if (key == am_flags) {
int num_flags = 21; /* MAXIMUM number of flags. */
Uint needed = 3+2*num_flags;
Eterm flag_list = NIL;
Eterm* limit;
#define FLAG0(flag_mask,flag) \
if (trace_flags & (flag_mask)) { flag_list = CONS(hp, flag, flag_list); hp += 2; } else {}
#if defined(DEBUG)
/*
* Check num_flags if this assertion fires.
*/
# define FLAG ASSERT(num_flags-- > 0); FLAG0
#else
# define FLAG FLAG0
#endif
hp = HAlloc(p, needed);
limit = hp+needed;