gprofng: remove memset() in libcollector

ChangeLog
2024-05-20  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	* libcollector/collector.c: Use static initialization instead of memset.
	* libcollector/dispatcher.c: Likewise.
	* libcollector/hwprofile.c: Likewise.
	* libcollector/jprofile.c: Likewise.
	* libcollector/profile.c: Likewise.
	* libcollector/synctrace.c: Likewise.

6 files changed, 24 insertions, 50 deletions

diff --git a/gprofng/libcollector/collector.c b/gprofng/libcollector/collector.c
index 3952975..3a8f27a 100644
--- a/gprofng/libcollector/collector.c
+++ b/gprofng/libcollector/collector.c
@@ -1344,10 +1344,9 @@ __collector_close_experiment ()
       return;
     }
 
-  struct sigaction sa;
-  CALL_UTIL (memset)(&sa, 0, sizeof (struct sigaction));
+  static struct sigaction sigaction_0 = {.sa_flags = SA_SIGINFO };
+  struct sigaction sa = sigaction_0;
   sa.sa_sigaction = __collector_SIGCHLD_signal_handler;
-  sa.sa_flags = SA_SIGINFO;
   __collector_sigaction (SIGCHLD, &sa, &original_sigchld_sigaction);
 
   /* linetrace interposition takes care of unsetting Environment variables */
@@ -2319,7 +2318,6 @@ ovw_write ()
     return 0;
   int fd;
   int res;
-  struct prusage usage;
   struct rusage rusage;
   hrtime_t hrt, delta;
 
@@ -2335,9 +2333,9 @@ ovw_write ()
       return ( hrt);
     }
 
-  CALL_UTIL (memset)(&usage, 0, sizeof (struct prusage));
+  static struct prusage usage_0 = { .pr_count = 1 };
+  struct prusage usage = usage_0;
   usage.pr_lwpid = getpid ();
-  usage.pr_count = 1;
   usage.pr_tstamp.tv_sec = hrt / NANOSEC;
   usage.pr_tstamp.tv_nsec = hrt % NANOSEC;
   usage.pr_create.tv_sec = starttime / NANOSEC;
diff --git a/gprofng/libcollector/dispatcher.c b/gprofng/libcollector/dispatcher.c
index d2a4ad0..8b8ad77 100644
--- a/gprofng/libcollector/dispatcher.c
+++ b/gprofng/libcollector/dispatcher.c
@@ -109,6 +109,7 @@ enum
   DISPATCH_TST = 2      /* dispatcher installed, and enabled in testing mode */
 };
 
+static struct sigaction sigaction_0;
 static int dispatch_mode = DISPATCH_NYI;   /* controls SIGPROF dispatching */
 static int itimer_period_requested = 0;    /* dispatcher itimer period */
 static int itimer_period_actual = 0;       /* actual dispatcher itimer period */
@@ -263,8 +264,7 @@ __collector_sigprof_install ()
     TprintfT (DBG_LT1, "dispatcher: __collector_ext_dispatcher_install() collector_sigprof_dispatcher already installed\n");
   else
     {
-      struct sigaction c_act;
-      CALL_UTIL (memset)(&c_act, 0, sizeof c_act);
+      struct sigaction c_act = sigaction_0;
       sigemptyset (&c_act.sa_mask);
       sigaddset (&c_act.sa_mask, HWCFUNCS_SIGNAL); /* block SIGEMT delivery in handler */
       c_act.sa_sigaction = collector_sigprof_dispatcher;
@@ -358,8 +358,7 @@ void
 __collector_SIGDFL_handler (int sig)
 {
   /* remove our dispatcher, replacing it with the default disposition */
-  struct sigaction act;
-  CALL_UTIL (memset)(&act, 0, sizeof (act));
+  struct sigaction act =  sigaction_0;
   act.sa_handler = SIG_DFL;
   if (__collector_sigaction (sig, &act, NULL))
     {
diff --git a/gprofng/libcollector/hwprofile.c b/gprofng/libcollector/hwprofile.c
index 364c600..cfe0d84 100644
--- a/gprofng/libcollector/hwprofile.c
+++ b/gprofng/libcollector/hwprofile.c
@@ -32,7 +32,6 @@
 #include <signal.h>
 
 #include "gp-defs.h"
-#define _STRING_H 1  /* XXX MEZ: temporary workaround */
 #include "hwcdrv.h"
 #include "collector_module.h"
 #include "gp-experiment.h"
@@ -409,8 +408,8 @@ hwc_initialize_handlers (void)
   else
     {
       /* set our signal handler */
-      struct sigaction c_act;
-      CALL_UTIL (memset)(&c_act, 0, sizeof c_act);
+      static struct sigaction c_act_0 = {.sa_flags = SA_RESTART | SA_SIGINFO};
+      struct sigaction c_act = c_act_0;
       sigemptyset (&c_act.sa_mask);
       sigaddset (&c_act.sa_mask, SIGPROF); /* block SIGPROF delivery in handler */
       /* XXXX should probably also block sample_sig & pause_sig */
@@ -531,8 +530,9 @@ collector_record_counter_internal (ucontext_t *ucp, int timecvt,
 				   uint64_t va, uint64_t latency,
 				   uint64_t data_source)
 {
-  MHwcntr_packet pckt;
-  CALL_UTIL (memset)(&pckt, 0, sizeof ( MHwcntr_packet));
+  static MHwcntr_packet hwc_packet_0 = {.comm.type = HW_PCKT,
+					.comm.tsize = sizeof (Hwcntr_packet)};
+  MHwcntr_packet pckt = hwc_packet_0;
   pckt.comm.tstamp = time;
   pckt.tag = tag;
   if (timecvt > 1)
@@ -547,8 +547,6 @@ collector_record_counter_internal (ucontext_t *ucp, int timecvt,
 	value *= timecvt;
     }
   pckt.interval = value;
-  pckt.comm.type = HW_PCKT;
-  pckt.comm.tsize = sizeof (Hwcntr_packet);
   TprintfT (DBG_LT4, "hwprofile: %llu sample %lld tag %u recorded\n",
 	    (unsigned long long) time, (long long) value, tag);
   if (ABS_memop == ABST_NOPC)
diff --git a/gprofng/libcollector/jprofile.c b/gprofng/libcollector/jprofile.c
index 2cabb1a..cd498be 100644
--- a/gprofng/libcollector/jprofile.c
+++ b/gprofng/libcollector/jprofile.c
@@ -361,8 +361,8 @@ JVM_OnLoad (JavaVM *vm, char *options, void *reserved)
       err = (*jvmti)->GetPotentialCapabilities (jvmti, &cpblts);
       if (err == JVMTI_ERROR_NONE)
 	{
-	  jvmtiCapabilities cpblts_set;
-	  CALL_UTIL (memset)(&cpblts_set, 0, sizeof (cpblts_set));
+	  static jvmtiCapabilities cpblts_set_0;
+	  jvmtiCapabilities cpblts_set = cpblts_set_0;
 
 	  /* Add only those capabilities that are among potential ones */
 	  cpblts_set.can_get_source_file_name = cpblts.can_get_source_file_name;
diff --git a/gprofng/libcollector/profile.c b/gprofng/libcollector/profile.c
index 127fd69..f654623 100644
--- a/gprofng/libcollector/profile.c
+++ b/gprofng/libcollector/profile.c
@@ -272,10 +272,9 @@ __collector_ext_profile_handler (siginfo_t *info, ucontext_t *context)
       CALL_UTIL (getcontext) (context);     /* initialize dummy context */
       SETFUNCTIONCONTEXT (context, &__collector_lost_profile_context);
     }
-  ClockPacket pckt;
-  CALL_UTIL (memset)(&pckt, 0, sizeof ( pckt));
-  pckt.comm.tsize = sizeof ( pckt);
-  pckt.comm.type = CLOCK_TYPE;
+  static ClockPacket clock_pckt_0 = {.comm.type = CLOCK_TYPE,
+				     .comm.tsize = sizeof (ClockPacket)};
+  ClockPacket pckt = clock_pckt_0;
   pckt.lwp_id = __collector_lwp_self ();
   pckt.thr_id = __collector_thr_self ();
   pckt.cpu_id = CALL_UTIL (getcpuid)();
diff --git a/gprofng/libcollector/synctrace.c b/gprofng/libcollector/synctrace.c
index a304188..2f3097f 100644
--- a/gprofng/libcollector/synctrace.c
+++ b/gprofng/libcollector/synctrace.c
@@ -75,6 +75,7 @@ static unsigned sync_key = COLLECTOR_TSD_INVALID_KEY;
 static long sync_threshold = -1; /* calibrate the value */
 static int init_thread_intf_started = 0;
 static int init_thread_intf_finished = 0;
+static Sync_packet spacket_0 = { .comm.tsize = sizeof ( Sync_packet) };
 
 #define CHCK_NREENTRANCE(x)     (!sync_native || !sync_mode || ((x) = collector_interface->getKey( sync_key )) == NULL || (*(x) != 0))
 #define RECHCK_NREENTRANCE(x)   (!sync_native || !sync_mode || ((x) = collector_interface->getKey( sync_key )) == NULL || (*(x) == 0))
@@ -137,15 +138,6 @@ static int (*__real_pthread_cond_timedwait_2_0) (pthread_cond_t *restrict cond,
 			pthread_mutex_t *restrict mutex,
 			const struct timespec *restrict abstime) = NULL;
 
-
-static void
-collector_memset (void *s, int c, size_t n)
-{
-  unsigned char *s1 = s;
-  while (n--)
-    *s1++ = (unsigned char) c;
-}
-
 void
 __collector_module_init (CollectorInterface *_collector_interface)
 {
@@ -568,9 +560,7 @@ __collector_jsync_end (hrtime_t reqt, void *object)
   hrtime_t grnt = gethrtime ();
   if (grnt - reqt >= sync_threshold)
     {
-      Sync_packet spacket;
-      collector_memset (&spacket, 0, sizeof (Sync_packet));
-      spacket.comm.tsize = sizeof (Sync_packet);
+      Sync_packet spacket = spacket_0;
       spacket.comm.tstamp = grnt;
       spacket.requested = reqt;
       spacket.objp = (intptr_t) object;
@@ -600,9 +590,7 @@ gprofng_pthread_mutex_lock (int (real_func) (pthread_mutex_t *),
   hrtime_t grnt = gethrtime ();
   if (grnt - reqt >= sync_threshold)
     {
-      Sync_packet spacket;
-      collector_memset (&spacket, 0, sizeof (Sync_packet));
-      spacket.comm.tsize = sizeof (Sync_packet);
+      Sync_packet spacket = spacket_0;
       spacket.comm.tstamp = grnt;
       spacket.requested = reqt;
       spacket.objp = (intptr_t) mp;
@@ -647,9 +635,7 @@ gprofng_pthread_cond_wait (int(real_func) (pthread_cond_t *, pthread_mutex_t *),
   hrtime_t grnt = gethrtime ();
   if (grnt - reqt >= sync_threshold)
     {
-      Sync_packet spacket;
-      collector_memset (&spacket, 0, sizeof (Sync_packet));
-      spacket.comm.tsize = sizeof (Sync_packet);
+      Sync_packet spacket = spacket_0;
       spacket.comm.tstamp = grnt;
       spacket.requested = reqt;
       spacket.objp = (intptr_t) mutex;
@@ -697,9 +683,7 @@ gprofng_pthread_cond_timedwait (int(real_func) (pthread_cond_t *,
   hrtime_t grnt = gethrtime ();
   if (grnt - reqt >= sync_threshold)
     {
-      Sync_packet spacket;
-      collector_memset (&spacket, 0, sizeof (Sync_packet));
-      spacket.comm.tsize = sizeof (Sync_packet);
+      Sync_packet spacket = spacket_0;
       spacket.comm.tstamp = grnt;
       spacket.requested = reqt;
       spacket.objp = (intptr_t) mutex;
@@ -746,9 +730,7 @@ gprofng_pthread_join (int(real_func) (pthread_t, void **),
   hrtime_t grnt = gethrtime ();
   if (grnt - reqt >= sync_threshold)
     {
-      Sync_packet spacket;
-      collector_memset (&spacket, 0, sizeof (Sync_packet));
-      spacket.comm.tsize = sizeof (Sync_packet);
+      Sync_packet spacket = spacket_0;
       spacket.comm.tstamp = grnt;
       spacket.requested = reqt;
       spacket.objp = (Vaddr_type) target_thread;
@@ -793,9 +775,7 @@ gprofng_sem_wait (int (real_func) (sem_t *), sem_t *sp)
   hrtime_t grnt = gethrtime ();
   if (grnt - reqt >= sync_threshold)
     {
-      Sync_packet spacket;
-      collector_memset (&spacket, 0, sizeof (Sync_packet));
-      spacket.comm.tsize = sizeof (Sync_packet);
+      Sync_packet spacket = spacket_0;
       spacket.comm.tstamp = grnt;
       spacket.requested = reqt;
       spacket.objp = (intptr_t) sp;