gmon.h
上传用户:szlgq88
上传日期:2009-04-28
资源大小:48287k
文件大小:6k
- /*-
- * 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 */