2 * Copyright (c) 1983, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
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15 * without specific prior written permission.
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29 #include <sys/param.h>
32 #include <sys/gmon_out.h>
45 extern int __profile_frequency
__P ((void));
47 struct __bb
*__bb_head
; /* Head of basic-block list or NULL. */
49 struct gmonparam _gmonparam
= { GMON_PROF_OFF
};
52 * See profil(2) where this is described:
55 #define SCALE_1_TO_1 0x10000L
57 #define ERR(s) __write(2, s, sizeof(s) - 1)
59 void moncontrol
__P ((int mode
));
60 void __moncontrol
__P ((int mode
));
61 static void write_hist
__P ((int fd
)) internal_function
;
62 static void write_call_graph
__P ((int fd
)) internal_function
;
63 static void write_bb_counts
__P ((int fd
)) internal_function
;
67 * profiling is what mcount checks to see if
68 * all the data structures are ready.
74 struct gmonparam
*p
= &_gmonparam
;
76 /* Don't change the state if we ran into an error. */
77 if (p
->state
== GMON_PROF_ERROR
)
83 __profil((void *) p
->kcount
, p
->kcountsize
, p
->lowpc
, s_scale
);
84 p
->state
= GMON_PROF_ON
;
89 __profil(NULL
, 0, 0, 0);
90 p
->state
= GMON_PROF_OFF
;
93 weak_alias (__moncontrol
, moncontrol
)
97 __monstartup (lowpc
, highpc
)
103 struct gmonparam
*p
= &_gmonparam
;
106 * round lowpc and highpc to multiples of the density we're using
107 * so the rest of the scaling (here and in gprof) stays in ints.
109 p
->lowpc
= ROUNDDOWN(lowpc
, HISTFRACTION
* sizeof(HISTCOUNTER
));
110 p
->highpc
= ROUNDUP(highpc
, HISTFRACTION
* sizeof(HISTCOUNTER
));
111 p
->textsize
= p
->highpc
- p
->lowpc
;
112 p
->kcountsize
= p
->textsize
/ HISTFRACTION
;
113 p
->hashfraction
= HASHFRACTION
;
114 p
->log_hashfraction
= -1;
115 /* The following test must be kept in sync with the corresponding
117 if ((HASHFRACTION
& (HASHFRACTION
- 1)) == 0) {
118 /* if HASHFRACTION is a power of two, mcount can use shifting
119 instead of integer division. Precompute shift amount. */
120 p
->log_hashfraction
= ffs(p
->hashfraction
* sizeof(*p
->froms
)) - 1;
122 p
->fromssize
= p
->textsize
/ HASHFRACTION
;
123 p
->tolimit
= p
->textsize
* ARCDENSITY
/ 100;
124 if (p
->tolimit
< MINARCS
)
125 p
->tolimit
= MINARCS
;
126 else if (p
->tolimit
> MAXARCS
)
127 p
->tolimit
= MAXARCS
;
128 p
->tossize
= p
->tolimit
* sizeof(struct tostruct
);
130 cp
= calloc (p
->kcountsize
+ p
->fromssize
+ p
->tossize
, 1);
133 ERR("monstartup: out of memory\n");
135 p
->state
= GMON_PROF_ERROR
;
138 p
->tos
= (struct tostruct
*)cp
;
140 p
->kcount
= (u_short
*)cp
;
142 p
->froms
= (u_short
*)cp
;
146 o
= p
->highpc
- p
->lowpc
;
147 if (p
->kcountsize
< (u_long
) o
)
150 s_scale
= ((float)p
->kcountsize
/ o
) * SCALE_1_TO_1
;
152 /* avoid floating point operations */
153 int quot
= o
/ p
->kcountsize
;
157 else if (quot
>= 0x100)
158 s_scale
= 0x10000 / quot
;
159 else if (o
>= 0x800000)
160 s_scale
= 0x1000000 / (o
/ (p
->kcountsize
>> 8));
162 s_scale
= 0x1000000 / ((o
<< 8) / p
->kcountsize
);
165 s_scale
= SCALE_1_TO_1
;
169 weak_alias(__monstartup
, monstartup
)
177 u_char tag
= GMON_TAG_TIME_HIST
;
178 struct gmon_hist_hdr thdr
__attribute__ ((aligned (__alignof__ (char *))));
180 if (_gmonparam
.kcountsize
> 0)
182 struct iovec iov
[3] =
184 { &tag
, sizeof (tag
) },
185 { &thdr
, sizeof (struct gmon_hist_hdr
) },
186 { _gmonparam
.kcount
, _gmonparam
.kcountsize
}
189 *(char **) thdr
.low_pc
= (char *) _gmonparam
.lowpc
;
190 *(char **) thdr
.high_pc
= (char *) _gmonparam
.highpc
;
191 *(int32_t *) thdr
.hist_size
= (_gmonparam
.kcountsize
192 / sizeof (HISTCOUNTER
));
193 *(int32_t *) thdr
.prof_rate
= __profile_frequency ();
194 strncpy (thdr
.dimen
, "seconds", sizeof (thdr
.dimen
));
195 thdr
.dimen_abbrev
= 's';
197 __writev (fd
, iov
, 3);
204 write_call_graph (fd
)
207 #define NARCS_PER_WRITEV 32
208 u_char tag
= GMON_TAG_CG_ARC
;
209 struct gmon_cg_arc_record raw_arc
[NARCS_PER_WRITEV
]
210 __attribute__ ((aligned (__alignof__ (char*))));
211 int from_index
, to_index
, from_len
;
213 struct iovec iov
[2 * NARCS_PER_WRITEV
];
216 for (nfilled
= 0; nfilled
< NARCS_PER_WRITEV
; ++nfilled
)
218 iov
[2 * nfilled
].iov_base
= &tag
;
219 iov
[2 * nfilled
].iov_len
= sizeof (tag
);
221 iov
[2 * nfilled
+ 1].iov_base
= &raw_arc
[nfilled
];
222 iov
[2 * nfilled
+ 1].iov_len
= sizeof (struct gmon_cg_arc_record
);
226 from_len
= _gmonparam
.fromssize
/ sizeof (*_gmonparam
.froms
);
227 for (from_index
= 0; from_index
< from_len
; ++from_index
)
229 if (_gmonparam
.froms
[from_index
] == 0)
232 frompc
= _gmonparam
.lowpc
;
233 frompc
+= (from_index
* _gmonparam
.hashfraction
234 * sizeof (*_gmonparam
.froms
));
235 for (to_index
= _gmonparam
.froms
[from_index
];
237 to_index
= _gmonparam
.tos
[to_index
].link
)
239 *(char **) raw_arc
[nfilled
].from_pc
= (char *) frompc
;
240 *(char **) raw_arc
[nfilled
].self_pc
=
241 (char *)_gmonparam
.tos
[to_index
].selfpc
;
242 *(int *) raw_arc
[nfilled
].count
= _gmonparam
.tos
[to_index
].count
;
244 if (++nfilled
== NARCS_PER_WRITEV
)
246 __writev (fd
, iov
, 2 * nfilled
);
252 __writev (fd
, iov
, 2 * nfilled
);
262 u_char tag
= GMON_TAG_BB_COUNT
;
266 struct iovec bbhead
[2] =
268 { &tag
, sizeof (tag
) },
269 { &ncounts
, sizeof (ncounts
) }
271 struct iovec bbbody
[8];
274 for (i
= 0; i
< (sizeof (bbbody
) / sizeof (bbbody
[0])); i
+= 2)
276 bbbody
[i
].iov_len
= sizeof (grp
->addresses
[0]);
277 bbbody
[i
+ 1].iov_len
= sizeof (grp
->counts
[0]);
280 /* Write each group of basic-block info (all basic-blocks in a
281 compilation unit form a single group). */
283 for (grp
= __bb_head
; grp
; grp
= grp
->next
)
285 ncounts
= grp
->ncounts
;
286 __writev (fd
, bbhead
, 2);
287 for (nfilled
= i
= 0; i
< ncounts
; ++i
)
289 if (nfilled
> (sizeof (bbbody
) / sizeof (bbbody
[0])) - 2)
291 __writev (fd
, bbbody
, nfilled
);
295 bbbody
[nfilled
++].iov_base
= (char *) &grp
->addresses
[i
];
296 bbbody
[nfilled
++].iov_base
= &grp
->counts
[i
];
299 __writev (fd
, bbbody
, nfilled
);
307 struct gmon_hdr ghdr
__attribute__ ((aligned (__alignof__ (int))));
311 env
= getenv ("GMON_OUT_PREFIX");
312 if (env
!= NULL
&& !__libc_enable_secure
)
314 size_t len
= strlen (env
);
316 sprintf (buf
, "%s.%u", env
, __getpid ());
317 fd
= __open (buf
, O_CREAT
|O_TRUNC
|O_WRONLY
, 0666);
322 fd
= __open ("gmon.out", O_CREAT
|O_TRUNC
|O_WRONLY
, 0666);
327 fprintf (stderr
, "_mcleanup: gmon.out: %s\n",
328 __strerror_r (errnum
, buf
, sizeof buf
));
333 /* write gmon.out header: */
334 memset (&ghdr
, '\0', sizeof (struct gmon_hdr
));
335 memcpy (&ghdr
.cookie
[0], GMON_MAGIC
, sizeof (ghdr
.cookie
));
336 *(int32_t *) ghdr
.version
= GMON_VERSION
;
337 __write (fd
, &ghdr
, sizeof (struct gmon_hdr
));
339 /* write PC histogram: */
342 /* write call-graph: */
343 write_call_graph (fd
);
345 /* write basic-block execution counts: */
346 write_bb_counts (fd
);
353 __write_profiling (void)
355 int save
= _gmonparam
.state
;
356 _gmonparam
.state
= GMON_PROF_OFF
;
357 if (save
== GMON_PROF_ON
)
359 _gmonparam
.state
= save
;
361 weak_alias (__write_profiling
, write_profiling
)
369 if (_gmonparam
.state
!= GMON_PROF_ERROR
)
372 /* free the memory. */
373 if (_gmonparam
.tos
!= NULL
)
374 free (_gmonparam
.tos
);