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
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15 * This product includes software developed by the University of
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33 #include <sys/param.h>
36 #include <sys/gmon_out.h>
48 extern int __profile_frequency
__P ((void));
50 struct __bb
*__bb_head
; /* Head of basic-block list or NULL. */
52 struct gmonparam _gmonparam
= { GMON_PROF_OFF
};
55 * See profil(2) where this is described:
58 #define SCALE_1_TO_1 0x10000L
60 #define ERR(s) write(2, s, sizeof(s) - 1)
62 void moncontrol
__P ((int mode
));
63 static void write_hist
__P ((int fd
));
64 static void write_call_graph
__P ((int fd
));
65 static void write_bb_counts
__P ((int fd
));
69 * profiling is what mcount checks to see if
70 * all the data structures are ready.
76 struct gmonparam
*p
= &_gmonparam
;
81 profil((void *) p
->kcount
, p
->kcountsize
, p
->lowpc
, s_scale
);
82 p
->state
= GMON_PROF_ON
;
87 profil((void *) 0, 0, 0, 0);
88 p
->state
= GMON_PROF_OFF
;
94 monstartup (lowpc
, highpc
)
100 struct gmonparam
*p
= &_gmonparam
;
103 * round lowpc and highpc to multiples of the density we're using
104 * so the rest of the scaling (here and in gprof) stays in ints.
106 p
->lowpc
= ROUNDDOWN(lowpc
, HISTFRACTION
* sizeof(HISTCOUNTER
));
107 p
->highpc
= ROUNDUP(highpc
, HISTFRACTION
* sizeof(HISTCOUNTER
));
108 p
->textsize
= p
->highpc
- p
->lowpc
;
109 p
->kcountsize
= p
->textsize
/ HISTFRACTION
;
110 p
->hashfraction
= HASHFRACTION
;
111 p
->log_hashfraction
= -1;
112 if ((HASHFRACTION
& (HASHFRACTION
- 1)) == 0) {
113 /* if HASHFRACTION is a power of two, mcount can use shifting
114 instead of integer division. Precompute shift amount. */
115 p
->log_hashfraction
= ffs(p
->hashfraction
* sizeof(*p
->froms
)) - 1;
117 p
->fromssize
= p
->textsize
/ HASHFRACTION
;
118 p
->tolimit
= p
->textsize
* ARCDENSITY
/ 100;
119 if (p
->tolimit
< MINARCS
)
120 p
->tolimit
= MINARCS
;
121 else if (p
->tolimit
> MAXARCS
)
122 p
->tolimit
= MAXARCS
;
123 p
->tossize
= p
->tolimit
* sizeof(struct tostruct
);
125 cp
= malloc (p
->kcountsize
+ p
->fromssize
+ p
->tossize
);
128 ERR(_("monstartup: out of memory\n"));
131 bzero(cp
, p
->kcountsize
+ p
->fromssize
+ p
->tossize
);
132 p
->tos
= (struct tostruct
*)cp
;
134 p
->kcount
= (u_short
*)cp
;
136 p
->froms
= (u_short
*)cp
;
140 o
= p
->highpc
- p
->lowpc
;
141 if (p
->kcountsize
< (u_long
) o
)
144 s_scale
= ((float)p
->kcountsize
/ o
) * SCALE_1_TO_1
;
146 /* avoid floating point operations */
147 int quot
= o
/ p
->kcountsize
;
151 else if (quot
>= 0x100)
152 s_scale
= 0x10000 / quot
;
153 else if (o
>= 0x800000)
154 s_scale
= 0x1000000 / (o
/ (p
->kcountsize
>> 8));
156 s_scale
= 0x1000000 / ((o
<< 8) / p
->kcountsize
);
159 s_scale
= SCALE_1_TO_1
;
169 u_char tag
= GMON_TAG_TIME_HIST
;
170 struct gmon_hist_hdr thdr
__attribute__ ((aligned (__alignof__ (char *))));
172 if (_gmonparam
.kcountsize
> 0)
174 struct iovec iov
[3] =
176 { &tag
, sizeof (tag
) },
177 { &thdr
, sizeof (struct gmon_hist_hdr
) },
178 { _gmonparam
.kcount
, _gmonparam
.kcountsize
}
181 *(char **) thdr
.low_pc
= (char *) _gmonparam
.lowpc
;
182 *(char **) thdr
.high_pc
= (char *) _gmonparam
.highpc
;
183 *(int *) thdr
.hist_size
= _gmonparam
.kcountsize
/ sizeof (HISTCOUNTER
);
184 *(int *) thdr
.prof_rate
= __profile_frequency ();
185 strncpy (thdr
.dimen
, "seconds", sizeof (thdr
.dimen
));
186 thdr
.dimen_abbrev
= 's';
188 __writev (fd
, iov
, 3);
194 write_call_graph (fd
)
197 #define NARCS_PER_WRITEV 32
198 u_char tag
= GMON_TAG_CG_ARC
;
199 struct gmon_cg_arc_record raw_arc
[NARCS_PER_WRITEV
]
200 __attribute__ ((aligned (__alignof__ (char*))));
201 int from_index
, to_index
, from_len
;
203 struct iovec iov
[2 * NARCS_PER_WRITEV
];
206 for (nfilled
= 0; nfilled
< NARCS_PER_WRITEV
; ++nfilled
)
208 iov
[2 * nfilled
].iov_base
= &tag
;
209 iov
[2 * nfilled
].iov_len
= sizeof (tag
);
211 iov
[2 * nfilled
+ 1].iov_base
= &raw_arc
[nfilled
];
212 iov
[2 * nfilled
+ 1].iov_len
= sizeof (struct gmon_cg_arc_record
);
216 from_len
= _gmonparam
.fromssize
/ sizeof (*_gmonparam
.froms
);
217 for (from_index
= 0; from_index
< from_len
; ++from_index
)
219 if (_gmonparam
.froms
[from_index
] == 0)
222 frompc
= _gmonparam
.lowpc
;
223 frompc
+= (from_index
* _gmonparam
.hashfraction
224 * sizeof (*_gmonparam
.froms
));
225 for (to_index
= _gmonparam
.froms
[from_index
];
227 to_index
= _gmonparam
.tos
[to_index
].link
)
229 *(char **) raw_arc
[nfilled
].from_pc
= (char *) frompc
;
230 *(char **) raw_arc
[nfilled
].self_pc
=
231 (char *)_gmonparam
.tos
[to_index
].selfpc
;
232 *(int *) raw_arc
[nfilled
].count
= _gmonparam
.tos
[to_index
].count
;
234 if (++nfilled
== NARCS_PER_WRITEV
)
236 __writev (fd
, iov
, 2 * nfilled
);
242 __writev (fd
, iov
, 2 * nfilled
);
251 u_char tag
= GMON_TAG_BB_COUNT
;
255 struct iovec bbhead
[2] =
257 { &tag
, sizeof (tag
) },
258 { &ncounts
, sizeof (ncounts
) }
260 struct iovec bbbody
[8];
263 for (i
= 0; i
< (sizeof (bbbody
) / sizeof (bbbody
[0])); i
+= 2)
265 bbbody
[i
].iov_len
= sizeof (grp
->addresses
[0]);
266 bbbody
[i
+ 1].iov_len
= sizeof (grp
->counts
[0]);
269 /* Write each group of basic-block info (all basic-blocks in a
270 compilation unit form a single group). */
272 for (grp
= __bb_head
; grp
; grp
= grp
->next
)
274 ncounts
= grp
->ncounts
;
275 __writev (fd
, bbhead
, 2);
276 for (nfilled
= i
= 0; i
< ncounts
; ++i
)
278 if (nfilled
> (sizeof (bbbody
) / sizeof (bbbody
[0])) - 2)
280 __writev (fd
, bbbody
, nfilled
);
284 bbbody
[nfilled
++].iov_base
= (char *) &grp
->addresses
[i
];
285 bbbody
[nfilled
++].iov_base
= &grp
->counts
[i
];
288 __writev (fd
, bbbody
, nfilled
);
296 struct gmon_hdr ghdr
__attribute__ ((aligned (__alignof__ (int))));
300 fd
= __open ("gmon.out", O_CREAT
|O_TRUNC
|O_WRONLY
, 0666);
303 perror ("_mcleanup: gmon.out");
307 /* write gmon.out header: */
308 memset (&ghdr
, 0, sizeof (struct gmon_hdr
));
309 memcpy (&ghdr
.cookie
[0], GMON_MAGIC
, sizeof (ghdr
.cookie
));
310 *(int *) ghdr
.version
= GMON_VERSION
;
311 __write (fd
, &ghdr
, sizeof (struct gmon_hdr
));
313 /* write PC histogram: */
316 /* write call-graph: */
317 write_call_graph (fd
);
319 /* write basic-block execution counts: */
320 write_bb_counts (fd
);