Update.

1998-06-08 13:34  Ulrich Drepper  <drepper@cygnus.com>

	* elf/sprof.c: Implement call graph profiling.

	* sysdeps/generic/getenv.c: Optimize to use strncmp less often.

1998-06-07  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* pwd/fgetpwent_r.c (__fgetpwent_r): Correct buffer overflow fix.
	* grp/fgetgrent_r.c (__fgetgrent_r): Likewise.
	* shadow/fgetspent_r.c (__fgetspent_r): Likewise.
	Noticed by Jake Garver <garver@valkyrie.net>.

1998-06-07  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* libio/genops.c (__underflow): Read character from read pointer
	as unsigned.
	(__uflow): Likewise.

7 files changed, 291 insertions, 35 deletions

diff --git a/ChangeLog b/ChangeLog
index cc8ba2f..f50ad34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,22 @@
+1998-06-08 13:34  Ulrich Drepper  <drepper@cygnus.com>
+
+	* elf/sprof.c: Implement call graph profiling.
+
+	* sysdeps/generic/getenv.c: Optimize to use strncmp less often.
+
+1998-06-07  Andreas Jaeger  <aj@arthur.rhein-neckar.de>
+
+	* pwd/fgetpwent_r.c (__fgetpwent_r): Correct buffer overflow fix.
+	* grp/fgetgrent_r.c (__fgetgrent_r): Likewise.
+	* shadow/fgetspent_r.c (__fgetspent_r): Likewise.
+	Noticed by Jake Garver <garver@valkyrie.net>.
+
+1998-06-07  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
+
+	* libio/genops.c (__underflow): Read character from read pointer
+	as unsigned.
+	(__uflow): Likewise.
+
 1998-06-07 13:32  Ulrich Drepper  <drepper@cygnus.com>
 
 	* libc.map: Add _dl_profile.
diff --git a/elf/sprof.c b/elf/sprof.c
index 477d95a..f54a616 100644
--- a/elf/sprof.c
+++ b/elf/sprof.c
@@ -76,6 +76,7 @@ static const struct argp_option options[] =
   { NULL, 0, NULL, 0, N_("Output selection:") },
   { "flat-profile", 'p', NULL, 0,
     N_("generate flat profile with counts and ticks") },
+  { "graph", 'q', NULL, 0, N_("generate call graph") },
 
   { "test", OPT_TEST, NULL, OPTION_HIDDEN, NULL },
   { NULL, 0, NULL, 0, NULL }
@@ -102,8 +103,9 @@ static enum
 {
   NONE = 0,
   FLAT_MODE = 1 << 0,
+  CALL_GRAPH_MODE = 1 << 1,
 
-  DEFAULT_MODE = FLAT_MODE
+  DEFAULT_MODE = FLAT_MODE | CALL_GRAPH_MODE
 } mode;
 
 /* If nonzero the total number of invocations of a function is emitted.  */
@@ -114,20 +116,32 @@ int do_test;
 
 /* Strcuture describing calls.  */
 struct here_fromstruct
-  {
-    struct here_cg_arc_record volatile *here;
-    uint16_t link;
-  };
+{
+  struct here_cg_arc_record volatile *here;
+  uint16_t link;
+};
 
 /* We define a special type to address the elements of the arc table.
    This is basically the `gmon_cg_arc_record' format but it includes
    the room for the tag and it uses real types.  */
 struct here_cg_arc_record
-  {
-    uintptr_t from_pc;
-    uintptr_t self_pc;
-    uint32_t count;
-  } __attribute__ ((packed));
+{
+  uintptr_t from_pc;
+  uintptr_t self_pc;
+  uint32_t count;
+} __attribute__ ((packed));
+
+
+struct known_symbol;
+struct arc_list
+{
+  size_t idx;
+  uintmax_t count;
+
+  struct arc_list *next;
+};
+
+static struct obstack ob_list;
 
 
 struct known_symbol
@@ -138,6 +152,9 @@ struct known_symbol
 
   uintmax_t ticks;
   uintmax_t calls;
+
+  struct arc_list *froms;
+  struct arc_list *tos;
 };
 
 
@@ -198,7 +215,9 @@ static void unload_profdata (struct profdata *profdata);
 static void count_total_ticks (struct shobj *shobj, struct profdata *profdata);
 static void count_calls (struct shobj *shobj, struct profdata *profdata);
 static void read_symbols (struct shobj *shobj);
+static void add_arcs (struct profdata *profdata);
 static void generate_flat_profile (struct profdata *profdata);
+static void generate_call_graph (struct profdata *profdata);
 
 
 int
@@ -278,6 +297,9 @@ no filename for profiling data given and shared object `%s' has no soname"),
   /* Count the calls.  */
   count_calls (shobj_handle, profdata_handle);
 
+  /* Add the arc information.  */
+  add_arcs (profdata_handle);
+
   /* If no mode is specified fall back to the default mode.  */
   if (mode == NONE)
     mode = DEFAULT_MODE;
@@ -286,6 +308,9 @@ no filename for profiling data given and shared object `%s' has no soname"),
   if (mode & FLAT_MODE)
     generate_flat_profile (profdata_handle);
 
+  if (mode & CALL_GRAPH_MODE)
+    generate_call_graph (profdata_handle);
+
   /* Free the resources.  */
   unload_shobj (shobj_handle);
   unload_profdata (profdata_handle);
@@ -300,6 +325,12 @@ parse_opt (int key, char *arg, struct argp_state *state)
 {
   switch (key)
     {
+    case 'p':
+      mode |= FLAT_MODE;
+      break;
+    case 'q':
+      mode |= CALL_GRAPH_MODE;
+      break;
     case OPT_TEST:
       do_test = 1;
       break;
@@ -800,7 +831,7 @@ count_total_ticks (struct shobj *shobj, struct profdata *profdata)
 }
 
 
-static struct known_symbol *
+static size_t
 find_symbol (uintptr_t addr)
 {
   size_t sidx = 0;
@@ -811,7 +842,7 @@ find_symbol (uintptr_t addr)
       uintptr_t end = start + sortsym[sidx]->size;
 
       if (addr >= start && addr < end)
-	return sortsym[sidx];
+	return sidx;
 
       if (addr < start)
 	break;
@@ -819,7 +850,7 @@ find_symbol (uintptr_t addr)
       ++sidx;
     }
 
-  return NULL;
+  return (size_t) -1l;
 }
 
 
@@ -833,12 +864,12 @@ count_calls (struct shobj *shobj, struct profdata *profdata)
   for (cnt = 0; cnt < narcs; ++cnt)
     {
       uintptr_t here = data[cnt].self_pc;
-      struct known_symbol *symbol;
+      size_t symbol_idx;
 
       /* Find the symbol for this address.  */
-      symbol = find_symbol (here);
-      if (symbol != NULL)
-	symbol->calls += data[cnt].count;
+      symbol_idx = find_symbol (here);
+      if (symbol_idx != (size_t) -1l)
+	sortsym[symbol_idx]->calls += data[cnt].count;
     }
 }
 
@@ -846,8 +877,8 @@ count_calls (struct shobj *shobj, struct profdata *profdata)
 static int
 symorder (const void *o1, const void *o2)
 {
-  const struct known_symbol *p1 = (struct known_symbol *) o1;
-  const struct known_symbol *p2 = (struct known_symbol *) o2;
+  const struct known_symbol *p1 = (const struct known_symbol *) o1;
+  const struct known_symbol *p2 = (const struct known_symbol *) o2;
 
   return p1->addr - p2->addr;
 }
@@ -872,6 +903,7 @@ read_symbols (struct shobj *shobj)
 #define obstack_chunk_free free
   obstack_init (&shobj->ob_str);
   obstack_init (&shobj->ob_sym);
+  obstack_init (&ob_list);
 
   /* Process the symbols.  */
   if (shobj->symtab)
@@ -947,6 +979,8 @@ read_symbols (struct shobj *shobj)
 	      newsym->addr = symtab->st_value;
 	      newsym->size = symtab->st_size;
 	      newsym->ticks = 0;
+	      newsym->froms = NULL;
+	      newsym->tos = NULL;
 
 	      existp = tfind (newsym, &symroot, symorder);
 	      if (existp == NULL)
@@ -979,6 +1013,85 @@ read_symbols (struct shobj *shobj)
 }
 
 
+static void
+add_arcs (struct profdata *profdata)
+{
+  uint32_t narcs = profdata->narcs;
+  struct here_cg_arc_record *data = profdata->data;
+  uint32_t cnt;
+
+  for (cnt = 0; cnt < narcs; ++cnt)
+    {
+      /* First add the incoming arc.  */
+      size_t sym_idx = find_symbol (data[cnt].self_pc);
+
+      if (sym_idx != (size_t) -1l)
+	{
+	  struct known_symbol *sym = sortsym[sym_idx];
+	  struct arc_list *runp = sym->froms;
+
+	  while (runp != NULL
+		 && ((data[cnt].from_pc == 0 && runp->idx != (size_t) -1l)
+		     || (data[cnt].from_pc != 0
+			 && (runp->idx == (size_t) -1l
+			     || data[cnt].from_pc < sortsym[runp->idx]->addr
+			     || (data[cnt].from_pc
+				 >= (sortsym[runp->idx]->addr
+				     + sortsym[runp->idx]->size))))))
+	    runp = runp->next;
+
+	  if (runp == NULL)
+	    {
+	      /* We need a new entry.  */
+	      struct arc_list *newp = (struct arc_list *)
+		obstack_alloc (&ob_list, sizeof (struct arc_list));
+
+	      if (data[cnt].from_pc == 0)
+		newp->idx = (size_t) -1l;
+	      else
+		newp->idx = find_symbol (data[cnt].from_pc);
+	      newp->count = data[cnt].count;
+	      newp->next = sym->froms;
+	      sym->froms = newp;
+	    }
+	  else
+	    /* Increment the counter for the found entry.  */
+	    runp->count += data[cnt].count;
+	}
+
+      /* Now add it to the appropriate outgoing list.  */
+      sym_idx = find_symbol (data[cnt].from_pc);
+      if (sym_idx != (size_t) -1l)
+	{
+	  struct known_symbol *sym = sortsym[sym_idx];
+	  struct arc_list *runp = sym->tos;
+
+	  while (runp != NULL
+		 && (runp->idx == (size_t) -1l
+		     || data[cnt].self_pc < sortsym[runp->idx]->addr
+		     || data[cnt].self_pc >= (sortsym[runp->idx]->addr
+					      + sortsym[runp->idx]->size)))
+	    runp = runp->next;
+
+	  if (runp == NULL)
+	    {
+	      /* We need a new entry.  */
+	      struct arc_list *newp = (struct arc_list *)
+		obstack_alloc (&ob_list, sizeof (struct arc_list));
+
+	      newp->idx = find_symbol (data[cnt].self_pc);
+	      newp->count = data[cnt].count;
+	      newp->next = sym->tos;
+	      sym->tos = newp;
+	    }
+	  else
+	    /* Increment the counter for the found entry.  */
+	    runp->count += data[cnt].count;
+	}
+    }
+}
+
+
 static int
 countorder (const void *p1, const void *p2)
 {
@@ -1007,13 +1120,13 @@ printflat (const void *node, VISIT value, int level)
 
       cumu_ticks += s->ticks;
 
-      printf ("%6.2f%10.2f%9.2f%9" PRIdMAX "%9.2f%9.2f  %s\n",
+      printf ("%6.2f%10.2f%9.2f%9" PRIdMAX "%9.2f           %s\n",
 	      total_ticks ? (100.0 * s->ticks) / total_ticks : 0.0,
 	      tick_unit * cumu_ticks,
 	      tick_unit * s->ticks,
 	      s->calls,
 	      s->calls ? (s->ticks * 1000000) * tick_unit / s->calls : 0,
-	      0.0,	/* FIXME: don't know about called functions.  */
+	      /* FIXME: don't know about called functions.  */
 	      s->name);
     }
 }
@@ -1049,3 +1162,71 @@ generate_flat_profile (struct profdata *profdata)
 
   tdestroy (data, freenoop);
 }
+
+
+static void
+generate_call_graph (struct profdata *profdata)
+{
+  size_t cnt;
+
+  puts ("\nindex % time    self  children    called     name\n");
+
+  for (cnt = 0; cnt < symidx; ++cnt)
+    if (sortsym[cnt]->froms != NULL || sortsym[cnt]->tos != NULL)
+      {
+	struct arc_list *runp;
+	size_t n;
+
+	/* First print the from-information.  */
+	runp = sortsym[cnt]->froms;
+	while (runp != NULL)
+	  {
+	    printf ("            %8.2f%8.2f%9" PRIdMAX "/%-9" PRIdMAX "   %s",
+		    (runp->idx != (size_t) -1l
+		     ? sortsym[runp->idx]->ticks * tick_unit : 0.0),
+		    0.0, /* FIXME: what's time for the childern, recursive */
+		    runp->count, sortsym[cnt]->calls,
+		    (runp->idx != (size_t) -1l ?
+		     sortsym[runp->idx]->name : "<UNKNOWN>"));
+
+	    if (runp->idx != (size_t) -1l)
+	      printf (" [%Zd]", runp->idx);
+	    putchar_unlocked ('\n');
+
+	    runp = runp->next;
+	  }
+
+	/* Info abount the function itself.  */
+	n = printf ("[%d]", cnt);
+	printf ("%*s%5.1f%8.2f%8.2f%9" PRIdMAX "         %s [%Zd]\n",
+		7 - n, " ",
+		total_ticks ? (100.0 * sortsym[cnt]->ticks) / total_ticks : 0,
+		sortsym[cnt]->ticks * tick_unit,
+		0.0, /* FIXME: what's time for the childern, recursive */
+		sortsym[cnt]->calls,
+		sortsym[cnt]->name, cnt);
+
+	/* Info about the functions this function calls.  */
+	runp = sortsym[cnt]->tos;
+	while (runp != NULL)
+	  {
+	    printf ("            %8.2f%8.2f%9" PRIdMAX "/",
+		    (runp->idx != (size_t) -1l
+		     ? sortsym[runp->idx]->ticks * tick_unit : 0.0),
+		    0.0, /* FIXME: what's time for the childern, recursive */
+		    runp->count);
+
+	    if (runp->idx != (size_t) -1l)
+	      printf ("%-9" PRIdMAX "   %s [%Zd]\n",
+		      sortsym[runp->idx]->calls,
+		      sortsym[runp->idx]->name,
+		      runp->idx);
+	    else
+	      fputs ("???         <UNKNOWN>\n\n", stdout);
+
+	    runp = runp->next;
+	  }
+
+	fputs ("-----------------------------------------------\n", stdout);
+      }
+}
diff --git a/grp/fgetgrent_r.c b/grp/fgetgrent_r.c
index de11326..0c87815 100644
--- a/grp/fgetgrent_r.c
+++ b/grp/fgetgrent_r.c
@@ -61,14 +61,14 @@ __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen,
 
   do
     {
-      buffer[buflen] = '\xff';
+      buffer[buflen - 1] = '\xff';
       p = fgets (buffer, buflen, stream);
       if (p == NULL && feof (stream))
 	{
 	  *result = NULL;
 	  return errno;
 	}
-      if (p == NULL || buffer[buflen] != '\xff')
+      if (p == NULL || buffer[buflen - 1] != '\xff')
 	{
 	  *result = NULL;
 	  return errno = ERANGE;
diff --git a/libio/genops.c b/libio/genops.c
index b0334d6..4286eef 100644
--- a/libio/genops.c
+++ b/libio/genops.c
@@ -273,7 +273,7 @@ __underflow (fp)
     {
       _IO_switch_to_main_get_area (fp);
       if (fp->_IO_read_ptr < fp->_IO_read_end)
-	return *fp->_IO_read_ptr;
+	return *(unsigned char *) fp->_IO_read_ptr;
     }
   if (_IO_have_markers (fp))
     {
@@ -298,7 +298,7 @@ __uflow (fp)
     {
       _IO_switch_to_main_get_area (fp);
       if (fp->_IO_read_ptr < fp->_IO_read_end)
-	return *fp->_IO_read_ptr++;
+	return *(unsigned char *) fp->_IO_read_ptr++;
     }
   if (_IO_have_markers (fp))
     {
diff --git a/pwd/fgetpwent_r.c b/pwd/fgetpwent_r.c
index 534afd5..87ea1de 100644
--- a/pwd/fgetpwent_r.c
+++ b/pwd/fgetpwent_r.c
@@ -74,14 +74,14 @@ __fgetpwent_r (FILE *stream, struct passwd *resbuf, char *buffer,
 
   do
     {
-      buffer[buflen] = '\xff';
+      buffer[buflen - 1] = '\xff';
       p = fgets (buffer, buflen, stream);
       if (p == NULL && feof (stream))
 	{
 	  *result = NULL;
 	  return errno;
 	}
-      if (p == NULL || buffer[buflen] != '\xff')
+      if (p == NULL || buffer[buflen - 1] != '\xff')
 	{
 	  *result = NULL;
 	  return errno = ERANGE;
diff --git a/shadow/fgetspent_r.c b/shadow/fgetspent_r.c
index cb14a23..bf4a3f8 100644
--- a/shadow/fgetspent_r.c
+++ b/shadow/fgetspent_r.c
@@ -41,14 +41,14 @@ __fgetspent_r (FILE *stream, struct spwd *resbuf, char *buffer, size_t buflen,
 
   do
     {
-      buffer[buflen] = '\xff';
+      buffer[buflen - 1] = '\xff';
       p = fgets (buffer, buflen, stream);
       if (p == NULL && feof (stream))
 	{
 	  *result = NULL;
 	  return errno;
 	}
-      if (p == NULL || buffer[buflen] != '\xff')
+      if (p == NULL || buffer[buflen - 1] != '\xff')
 	{
 	  *result = NULL;
 	  return errno = ERANGE;
diff --git a/sysdeps/generic/getenv.c b/sysdeps/generic/getenv.c
index 990ddfd..b6f405d 100644
--- a/sysdeps/generic/getenv.c
+++ b/sysdeps/generic/getenv.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1992, 1994, 1996 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1992, 1994, 1996, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -16,7 +16,9 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
+#include <endian.h>
 #include <errno.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -25,20 +27,74 @@
 #define	__environ	environ
 #endif
 
-/* Return the value of the environment variable NAME.  */
+/* Return the value of the environment variable NAME.  This implementation
+   is tuned a bit in that it assumes no environment variable has an empty
+   name which of course should always be true.  We have a special case for
+   one character names so that for the general case we can assume at least
+   two characters which we can access.  By doing this we can avoid using the
+   `strncmp' most of the time.  */
 char *
 getenv (name)
      const char *name;
 {
   const size_t len = strlen (name);
   char **ep;
+  uint16_t name_start;
 
-  if (__environ == NULL)
+  if (__environ == NULL || name[0] == '\0')
     return NULL;
 
-  for (ep = __environ; *ep != NULL; ++ep)
-    if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
-      return &(*ep)[len + 1];
+  if (name[1] == '\0')
+    {
+      /* The name of the variable consists of only one character.  Therefore
+	 the first two characters of the environment entry are this character
+	 and a '=' character.  */
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+      name_start = ('=' << 8) | *(const unsigned char *) name;
+#else
+# if __BYTE_ORDER == __BIG_ENDIAN
+      name_start = '=' | ((*(const unsigned char *) name) << 8);
+# else
+ #error "Funny byte order."
+# endif
+#endif
+      for (ep = __environ; *ep != NULL; ++ep)
+	{
+#if _STRING_ARCH_unaligned
+	  uint16_t ep_start = *(uint16_t *) *ep;
+#else
+	  uint16_t ep_start = (((unsigned char *) *ep)[0]
+			       | (((unsigned char *) *ep)[1] << 8));
+#endif
+	  if (name_start == ep_start)
+	    return &(*ep)[2];
+	}
+    }
+  else
+    {
+#if _STRING_ARCH_unaligned
+      name_start = *(const uint16_t *) name;
+#else
+      name_start = (((const unsigned char *) name)[0]
+		    | (((const unsigned char *) name)[1] << 8));
+#endif
+      len -= 2;
+      name += 2;
+
+      for (ep = __environ; *ep != NULL; ++ep)
+	{
+#if _STRING_ARCH_unaligned
+	  uint16_t ep_start = *(uint16_t *) *ep;
+#else
+	  uint16_t ep_start = (((unsigned char *) *ep)[0]
+			       | (((unsigned char *) *ep)[1] << 8));
+#endif
+
+	  if (name_start == ep_start && !strncmp (*ep + 2, name, len)
+	      && (*ep)[len + 2] == '=')
+	    return &(*ep)[len + 3];
+	}
+    }
 
   return NULL;
 }