Sun Feb 25 22:36:10 1996 David Mosberger-Tang <davidm@azstarnet.com>
[kopensolaris-gnu/glibc.git] / gmon / gmon.c
index 3428016..8e47c52 100644 (file)
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
-
-#if !defined(lint) && defined(LIBC_SCCS)
-static char sccsid[] = "@(#)gmon.c     8.1 (Berkeley) 6/4/93";
-#endif
-
 #include <sys/param.h>
 #include <sys/time.h>
 #include <sys/gmon.h>
+#include <sys/gmon_out.h>
 
+#include <ansidecl.h>
 #include <stdio.h>
 #include <fcntl.h>
+#include <unistd.h>
+
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
+struct __bb *__bb_head;        /*  Head of basic-block list or NULL. */
+
 struct gmonparam _gmonparam = { GMON_PROF_OFF };
 
+/*
+ * See profil(2) where this is described:
+ */
 static int     s_scale;
-/* see profil(2) where this is describe (incorrectly) */
 #define                SCALE_1_TO_1    0x10000L
 
-#define ERR(s) write(2, s, sizeof(s) - 1)
+#define ERR(s) write(2, s, sizeof(s))
+
+/*
+ * Discover the tick frequency of the machine if something goes wrong,
+ * we return 0, an impossible hertz.
+ */
+static int
+DEFUN_VOID(hertz)
+{
+  struct itimerval tim;
+    
+  tim.it_interval.tv_sec = 0;
+  tim.it_interval.tv_usec = 1;
+  tim.it_value.tv_sec = 0;
+  tim.it_value.tv_usec = 0;
+  setitimer(ITIMER_REAL, &tim, 0);
+  setitimer(ITIMER_REAL, 0, &tim);
+  if (tim.it_interval.tv_usec < 2)
+    return 0;
+  return (1000000 / tim.it_interval.tv_usec);
+}
+
+
+/*
+ * Control profiling
+ *     profiling is what mcount checks to see if
+ *     all the data structures are ready.
+ */
+void
+DEFUN(moncontrol, (mode), int mode)
+{
+  struct gmonparam *p = &_gmonparam;
+
+  if (mode)
+    {
+      /* start */
+      profil((void *) p->kcount, p->kcountsize, p->lowpc, s_scale);
+      p->state = GMON_PROF_ON;
+    }
+  else
+    {
+      /* stop */
+      profil((void *) 0, 0, 0, 0);
+      p->state = GMON_PROF_OFF;
+    }
+}
 
-void   moncontrol __P((int));
-static int hertz __P((void));
 
 void
-monstartup(lowpc, highpc)
-       u_long lowpc;
-       u_long highpc;
+DEFUN(monstartup, (lowpc, highpc), u_long lowpc AND u_long highpc)
 {
-       register int o;
-       char *cp;
-       struct gmonparam *p = &_gmonparam;
-
-       /*
-        * round lowpc and highpc to multiples of the density we're using
-        * so the rest of the scaling (here and in gprof) stays in ints.
-        */
-       p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
-       p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
-       p->textsize = p->highpc - p->lowpc;
-       p->kcountsize = p->textsize / HISTFRACTION;
-       p->hashfraction = HASHFRACTION;
-       p->fromssize = p->textsize / HASHFRACTION;
-       p->tolimit = p->textsize * ARCDENSITY / 100;
-       if (p->tolimit < MINARCS)
-               p->tolimit = MINARCS;
-       else if (p->tolimit > MAXARCS)
-               p->tolimit = MAXARCS;
-       p->tossize = p->tolimit * sizeof(struct tostruct);
-
-       cp = malloc (p->kcountsize + p->fromssize + p->tossize);
-       if (! cp) {
-               ERR("monstartup: out of memory\n");
-               return;
-       }
-       bzero(cp, p->kcountsize + p->fromssize + p->tossize);
-       p->tos = (struct tostruct *)cp;
-       cp += p->tossize;
-       p->kcount = (u_short *)cp;
-       cp += p->kcountsize;
-       p->froms = (u_short *)cp;
+  register int o;
+  char *cp;
+  struct gmonparam *p = &_gmonparam;
+
+  /*
+   * round lowpc and highpc to multiples of the density we're using
+   * so the rest of the scaling (here and in gprof) stays in ints.
+   */
+  p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
+  p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
+  p->textsize = p->highpc - p->lowpc;
+  p->kcountsize = p->textsize / HISTFRACTION;
+  p->hashfraction = HASHFRACTION;
+  p->log_hashfraction = -1;
+  if ((HASHFRACTION & (HASHFRACTION - 1)) == 0) {
+      /* if HASHFRACTION is a power of two, mcount can use shifting
+        instead of integer division.  Precompute shift amount. */
+      p->log_hashfraction = ffs(p->hashfraction * sizeof(*p->froms)) - 1;
+  }
+  p->fromssize = p->textsize / HASHFRACTION;
+  p->tolimit = p->textsize * ARCDENSITY / 100;
+  if (p->tolimit < MINARCS)
+    p->tolimit = MINARCS;
+  else if (p->tolimit > MAXARCS)
+    p->tolimit = MAXARCS;
+  p->tossize = p->tolimit * sizeof(struct tostruct);
 
-       p->tos[0].link = 0;
+  cp = malloc (p->kcountsize + p->fromssize + p->tossize);
+  if (! cp)
+    {
+      ERR("monstartup: out of memory\n");
+      return;
+    }
+  bzero(cp, p->kcountsize + p->fromssize + p->tossize);
+  p->tos = (struct tostruct *)cp;
+  cp += p->tossize;
+  p->kcount = (u_short *)cp;
+  cp += p->kcountsize;
+  p->froms = (u_short *)cp;
 
-       o = p->highpc - p->lowpc;
-       if (p->kcountsize < o) {
+  p->tos[0].link = 0;
+
+  o = p->highpc - p->lowpc;
+  if (p->kcountsize < o)
+    {
 #ifndef hp300
-               s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
-#else /* avoid floating point */
-               int quot = o / p->kcountsize;
-               
-               if (quot >= 0x10000)
-                       s_scale = 1;
-               else if (quot >= 0x100)
-                       s_scale = 0x10000 / quot;
-               else if (o >= 0x800000)
-                       s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
-               else
-                       s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
+      s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
+#else
+      /* avoid floating point operations */
+      int quot = o / p->kcountsize;
+
+      if (quot >= 0x10000)
+       s_scale = 1;
+      else if (quot >= 0x100)
+       s_scale = 0x10000 / quot;
+      else if (o >= 0x800000)
+       s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
+      else
+       s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
 #endif
-       } else
-               s_scale = SCALE_1_TO_1;
+    } else
+      s_scale = SCALE_1_TO_1;
 
-       moncontrol(1);
+  moncontrol(1);
 }
 
-void
-_mcleanup()
+
+static void
+DEFUN(write_hist, (fd), int fd)
 {
-       int fd;
-       int fromindex;
-       int endfrom;
-       u_long frompc;
-       int toindex;
-       struct rawarc rawarc;
-       struct gmonparam *p = &_gmonparam;
-       struct gmonhdr gmonhdr, *hdr;
-#ifdef DEBUG
-       int log, len;
-       char buf[200];
-#endif
+  const u_char tag = GMON_TAG_TIME_HIST;
+  struct gmon_hist_hdr thdr;
+  int size, rate;
 
-       if (p->state == GMON_PROF_ERROR)
-               ERR("_mcleanup: tos overflow\n");
+  if (_gmonparam.kcountsize > 0)
+    {
+      size = _gmonparam.kcountsize / sizeof(HISTCOUNTER);
+      rate = hertz();
+      bcopy(&_gmonparam.lowpc, &thdr.low_pc, sizeof(thdr.low_pc));
+      bcopy(&_gmonparam.highpc, &thdr.high_pc, sizeof(thdr.high_pc));
+      bcopy(&size, &thdr.hist_size, sizeof(thdr.hist_size));
+      bcopy(&rate, &thdr.prof_rate, sizeof(thdr.prof_rate));
+      strcpy(thdr.dimen, "seconds");
+      thdr.dimen_abbrev = 's';
 
-       moncontrol(0);
-       fd = open("gmon.out", O_CREAT|O_TRUNC|O_WRONLY, 0666);
-       if (fd < 0) {
-               perror("mcount: gmon.out");
-               return;
-       }
-#ifdef DEBUG
-       log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
-       if (log < 0) {
-               perror("mcount: gmon.log");
-               return;
-       }
-       len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n",
-           p->kcount, p->kcountsize);
-       write(log, buf, len);
-#endif
-       hdr = (struct gmonhdr *)&gmonhdr;
-       hdr->lpc = p->lowpc;
-       hdr->hpc = p->highpc;
-       hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
-       hdr->version = GMONVERSION;
-       hdr->profrate = hertz();
-       write(fd, (char *)hdr, sizeof *hdr);
-       write(fd, p->kcount, p->kcountsize);
-       endfrom = p->fromssize / sizeof(*p->froms);
-       for (fromindex = 0; fromindex < endfrom; fromindex++) {
-               if (p->froms[fromindex] == 0)
-                       continue;
-
-               frompc = p->lowpc;
-               frompc += fromindex * p->hashfraction * sizeof(*p->froms);
-               for (toindex = p->froms[fromindex]; toindex != 0;
-                    toindex = p->tos[toindex].link) {
-#ifdef DEBUG
-                       len = sprintf(buf,
-                       "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" ,
-                               frompc, p->tos[toindex].selfpc,
-                               p->tos[toindex].count);
-                       write(log, buf, len);
-#endif
-                       rawarc.raw_frompc = frompc;
-                       rawarc.raw_selfpc = p->tos[toindex].selfpc;
-                       rawarc.raw_count = p->tos[toindex].count;
-                       write(fd, &rawarc, sizeof rawarc);
-               }
-       }
-       close(fd);
+      write(fd, &tag, sizeof(tag));
+      write(fd, &thdr, sizeof(thdr));
+      write(fd, _gmonparam.kcount, _gmonparam.kcountsize);
+    }
 }
 
-/*
- * Control profiling
- *     profiling is what mcount checks to see if
- *     all the data structures are ready.
- */
-void
-moncontrol(mode)
-       int mode;
+
+static void
+DEFUN(write_call_graph, (fd), int fd)
 {
-       struct gmonparam *p = &_gmonparam;
-
-       if (mode) {
-               /* start */
-               profil(p->kcount, p->kcountsize, (int)p->lowpc,
-                   s_scale);
-               p->state = GMON_PROF_ON;
-       } else {
-               /* stop */
-               profil(0, 0, 0, 0);
-               p->state = GMON_PROF_OFF;
+  const u_char tag = GMON_TAG_CG_ARC;
+  struct gmon_cg_arc_record raw_arc;
+  int from_index, to_index, from_len;
+  u_long frompc;
+
+  from_len = _gmonparam.fromssize / sizeof(*_gmonparam.froms);
+  for (from_index = 0; from_index < from_len; ++from_index)
+    {
+      if (_gmonparam.froms[from_index] == 0)
+       continue;
+
+      frompc = _gmonparam.lowpc;
+      frompc += (from_index * _gmonparam.hashfraction
+                * sizeof(*_gmonparam.froms));
+      for (to_index = _gmonparam.froms[from_index];
+          to_index != 0;
+          to_index = _gmonparam.tos[to_index].link)
+       {
+         bcopy(&frompc, &raw_arc.from_pc, sizeof(raw_arc.from_pc));
+         bcopy(&_gmonparam.tos[to_index].selfpc, &raw_arc.self_pc,
+               sizeof(raw_arc.self_pc));
+         bcopy(&_gmonparam.tos[to_index].count, &raw_arc.count,
+               sizeof(raw_arc.count));
+
+         write(fd, &tag, sizeof(tag));
+         write(fd, &raw_arc, sizeof(raw_arc));
        }
+    }
 }
 
-/*
- * discover the tick frequency of the machine
- * if something goes wrong, we return 0, an impossible hertz.
- */
-static int
-hertz()
+
+static void
+DEFUN(write_bb_counts, (fd), int fd)
 {
-       struct itimerval tim;
-       
-       tim.it_interval.tv_sec = 0;
-       tim.it_interval.tv_usec = 1;
-       tim.it_value.tv_sec = 0;
-       tim.it_value.tv_usec = 0;
-       setitimer(ITIMER_REAL, &tim, 0);
-       setitimer(ITIMER_REAL, 0, &tim);
-       if (tim.it_interval.tv_usec < 2)
-               return(0);
-       return (1000000 / tim.it_interval.tv_usec);
+  struct __bb *grp;
+  const u_char tag = GMON_TAG_BB_COUNT;
+  int ncounts;
+  int i;
+
+  /* Write each group of basic-block info (all basic-blocks in a
+     compilation unit form a single group). */
+
+  for (grp = __bb_head; grp; grp = grp->next)
+    {
+      ncounts = grp->ncounts;
+      write(fd, &tag, sizeof(tag));
+      write(fd, &ncounts, sizeof(ncounts));
+      for (i = 0; i < ncounts; ++i)
+       {
+         write(fd, &grp->addresses[i], sizeof(grp->addresses[0]));
+         write(fd, &grp->counts[i], sizeof(grp->counts[0]));
+       }
+    }
 }
 
 
+void
+DEFUN_VOID(_mcleanup)
+{
+    const int version = GMON_VERSION;
+    struct gmon_hdr ghdr;
+    int fd;
+
+    moncontrol(0);
+    fd = open("gmon.out", O_CREAT|O_TRUNC|O_WRONLY, 0666);
+    if (fd < 0)
+      {
+       perror("_mcleanup: gmon.out");
+       return;
+      }
+
+    /* write gmon.out header: */
+    bcopy(GMON_MAGIC, &ghdr.cookie[0], 4);
+    bcopy(&version, &ghdr.version, sizeof(version));
+    write(fd, &ghdr, sizeof(ghdr));
+
+    /* write PC histogram: */
+    write_hist(fd);
+
+    /* write call-graph: */
+    write_call_graph(fd);
+
+    /* write basic-block execution counts: */
+    write_bb_counts(fd);
+
+    close(fd);
+}