Edit File: gmon.h
/*- * 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 */