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Diffstat (limited to 'include/sys/gmon.h')
| -rw-r--r-- | include/sys/gmon.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/include/sys/gmon.h b/include/sys/gmon.h new file mode 100644 index 000000000..c02f8316d --- /dev/null +++ b/include/sys/gmon.h @@ -0,0 +1,201 @@ +/*- + * Copyright (c) 1982, 1986, 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)gmon.h 8.2 (Berkeley) 1/4/94 + */ + +#ifndef _SYS_GMON_H +#define _SYS_GMON_H 1 + +#include <features.h> + +#include <sys/types.h> + +/* + * See gmon_out.h for gmon.out format. + */ + +/* structure emitted by "gcc -a". This must match struct bb in + gcc/libgcc2.c. It is OK for gcc to declare a longer structure as + long as the members below are present. */ +struct __bb +{ + long zero_word; + const char *filename; + long *counts; + long ncounts; + struct __bb *next; + const unsigned long *addresses; +}; + +extern struct __bb *__bb_head; + +/* + * histogram counters are unsigned shorts (according to the kernel). + */ +#define HISTCOUNTER unsigned short + +/* + * fraction of text space to allocate for histogram counters here, 1/2 + */ +#define HISTFRACTION 2 + +/* + * Fraction of text space to allocate for from hash buckets. + * The value of HASHFRACTION is based on the minimum number of bytes + * of separation between two subroutine call points in the object code. + * Given MIN_SUBR_SEPARATION bytes of separation the value of + * HASHFRACTION is calculated as: + * + * HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1); + * + * For example, on the VAX, the shortest two call sequence is: + * + * calls $0,(r0) + * calls $0,(r0) + * + * which is separated by only three bytes, thus HASHFRACTION is + * calculated as: + * + * HASHFRACTION = 3 / (2 * 2 - 1) = 1 + * + * Note that the division above rounds down, thus if MIN_SUBR_FRACTION + * is less than three, this algorithm will not work! + * + * In practice, however, call instructions are rarely at a minimal + * distance. Hence, we will define HASHFRACTION to be 2 across all + * architectures. This saves a reasonable amount of space for + * profiling data structures without (in practice) sacrificing + * any granularity. + */ +#define HASHFRACTION 2 + +/* + * Percent of text space to allocate for tostructs. + * This is a heuristic; we will fail with a warning when profiling programs + * with a very large number of very small functions, but that's + * normally OK. + * 2 is probably still a good value for normal programs. + * Profiling a test case with 64000 small functions will work if + * you raise this value to 3 and link statically (which bloats the + * text size, thus raising the number of arcs expected by the heuristic). + */ +#define ARCDENSITY 3 + +/* + * Always allocate at least this many tostructs. This + * hides the inadequacy of the ARCDENSITY heuristic, at least + * for small programs. + */ +#define MINARCS 50 + +/* + * The type used to represent indices into gmonparam.tos[]. + */ +#define ARCINDEX u_long + +/* + * Maximum number of arcs we want to allow. + * Used to be max representable value of ARCINDEX minus 2, but now + * that ARCINDEX is a long, that's too large; we don't really want + * to allow a 48 gigabyte table. + * The old value of 1<<16 wasn't high enough in practice for large C++ + * programs; will 1<<20 be adequate for long? FIXME + */ +#define MAXARCS (1 << 20) + +struct tostruct { + u_long selfpc; + long count; + ARCINDEX link; +}; + +/* + * a raw arc, with pointers to the calling site and + * the called site and a count. + */ +struct rawarc { + u_long raw_frompc; + u_long raw_selfpc; + long raw_count; +}; + +/* + * general rounding functions. + */ +#define ROUNDDOWN(x,y) (((x)/(y))*(y)) +#define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y)) + +/* + * The profiling data structures are housed in this structure. + */ +struct gmonparam { + long int state; + u_short *kcount; + u_long kcountsize; + ARCINDEX *froms; + u_long fromssize; + struct tostruct *tos; + u_long tossize; + long tolimit; + u_long lowpc; + u_long highpc; + u_long textsize; + u_long hashfraction; + long log_hashfraction; +}; + +/* + * Possible states of profiling. + */ +#define GMON_PROF_ON 0 +#define GMON_PROF_BUSY 1 +#define GMON_PROF_ERROR 2 +#define GMON_PROF_OFF 3 + +/* + * Sysctl definitions for extracting profiling information from the kernel. + */ +#define GPROF_STATE 0 /* int: profiling enabling variable */ +#define GPROF_COUNT 1 /* struct: profile tick count buffer */ +#define GPROF_FROMS 2 /* struct: from location hash bucket */ +#define GPROF_TOS 3 /* struct: destination/count structure */ +#define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */ + +__BEGIN_DECLS + +/* Set up data structures and start profiling. */ +extern void __monstartup (u_long __lowpc, u_long __highpc) __THROW; +extern void monstartup (u_long __lowpc, u_long __highpc) __THROW; + +/* Clean up profiling and write out gmon.out. */ +extern void _mcleanup (void) __THROW; + +__END_DECLS + +#endif /* sys/gmon.h */ |