449 lines
12 KiB
C
449 lines
12 KiB
C
/*-
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* Copyright (c) 1983, 1992, 1993, 2011
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/gmon.h>
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#include <sys/gmon_out.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <libc-internal.h>
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#include <not-cancel.h>
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#ifdef PIC
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# include <link.h>
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static int
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callback (struct dl_phdr_info *info, size_t size, void *data)
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{
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if (info->dlpi_name[0] == '\0')
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{
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/* The link map for the executable is created by calling
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_dl_new_object with "" as filename. dl_iterate_phdr
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calls the callback function with filename from the
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link map as dlpi_name. */
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u_long *load_address = data;
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*load_address = (u_long) info->dlpi_addr;
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return 1;
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}
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return 0;
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}
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#endif
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/* Head of basic-block list or NULL. */
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struct __bb *__bb_head attribute_hidden;
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struct gmonparam _gmonparam attribute_hidden = { GMON_PROF_OFF };
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/*
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* See profil(2) where this is described:
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*/
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static int s_scale;
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#define SCALE_1_TO_1 0x10000L
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#define ERR(s) __write_nocancel (STDERR_FILENO, s, sizeof (s) - 1)
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void moncontrol (int mode);
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void __moncontrol (int mode);
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libc_hidden_proto (__moncontrol)
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static void write_hist (int fd, u_long load_address);
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static void write_call_graph (int fd, u_long load_address);
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static void write_bb_counts (int fd);
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/*
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* Control profiling
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* profiling is what mcount checks to see if
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* all the data structures are ready.
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*/
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void
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__moncontrol (int mode)
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{
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struct gmonparam *p = &_gmonparam;
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/* Don't change the state if we ran into an error. */
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if (p->state == GMON_PROF_ERROR)
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return;
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if (mode)
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{
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/* start */
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__profil((void *) p->kcount, p->kcountsize, p->lowpc, s_scale);
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p->state = GMON_PROF_ON;
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}
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else
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{
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/* stop */
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__profil(NULL, 0, 0, 0);
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p->state = GMON_PROF_OFF;
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}
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}
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libc_hidden_def (__moncontrol)
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weak_alias (__moncontrol, moncontrol)
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void
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__monstartup (u_long lowpc, u_long highpc)
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{
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int o;
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char *cp;
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struct gmonparam *p = &_gmonparam;
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/*
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* round lowpc and highpc to multiples of the density we're using
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* so the rest of the scaling (here and in gprof) stays in ints.
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*/
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p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->textsize = p->highpc - p->lowpc;
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p->kcountsize = ROUNDUP(p->textsize / HISTFRACTION, sizeof(*p->froms));
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p->hashfraction = HASHFRACTION;
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p->log_hashfraction = -1;
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/* The following test must be kept in sync with the corresponding
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test in mcount.c. */
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if ((HASHFRACTION & (HASHFRACTION - 1)) == 0) {
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/* if HASHFRACTION is a power of two, mcount can use shifting
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instead of integer division. Precompute shift amount. */
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p->log_hashfraction = ffs(p->hashfraction * sizeof(*p->froms)) - 1;
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}
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p->fromssize = p->textsize / HASHFRACTION;
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p->tolimit = p->textsize * ARCDENSITY / 100;
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if (p->tolimit < MINARCS)
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p->tolimit = MINARCS;
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else if (p->tolimit > MAXARCS)
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p->tolimit = MAXARCS;
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p->tossize = p->tolimit * sizeof(struct tostruct);
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cp = calloc (p->kcountsize + p->fromssize + p->tossize, 1);
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if (! cp)
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{
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ERR("monstartup: out of memory\n");
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p->tos = NULL;
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p->state = GMON_PROF_ERROR;
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return;
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}
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p->tos = (struct tostruct *)cp;
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cp += p->tossize;
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p->kcount = (HISTCOUNTER *)cp;
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cp += p->kcountsize;
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p->froms = (ARCINDEX *)cp;
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p->tos[0].link = 0;
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o = p->highpc - p->lowpc;
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if (p->kcountsize < (u_long) o)
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{
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#ifndef hp300
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s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
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#else
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/* avoid floating point operations */
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int quot = o / p->kcountsize;
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if (quot >= 0x10000)
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s_scale = 1;
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else if (quot >= 0x100)
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s_scale = 0x10000 / quot;
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else if (o >= 0x800000)
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s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
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else
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s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
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#endif
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} else
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s_scale = SCALE_1_TO_1;
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__moncontrol(1);
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}
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weak_alias (__monstartup, monstartup)
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static void
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write_hist (int fd, u_long load_address)
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{
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u_char tag = GMON_TAG_TIME_HIST;
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if (_gmonparam.kcountsize > 0)
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{
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struct real_gmon_hist_hdr
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{
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char *low_pc;
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char *high_pc;
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int32_t hist_size;
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int32_t prof_rate;
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char dimen[15];
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char dimen_abbrev;
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} thdr;
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struct iovec iov[3] =
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{
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{ &tag, sizeof (tag) },
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{ &thdr, sizeof (struct gmon_hist_hdr) },
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{ _gmonparam.kcount, _gmonparam.kcountsize }
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};
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if (sizeof (thdr) != sizeof (struct gmon_hist_hdr)
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|| (offsetof (struct real_gmon_hist_hdr, low_pc)
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!= offsetof (struct gmon_hist_hdr, low_pc))
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|| (offsetof (struct real_gmon_hist_hdr, high_pc)
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!= offsetof (struct gmon_hist_hdr, high_pc))
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|| (offsetof (struct real_gmon_hist_hdr, hist_size)
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!= offsetof (struct gmon_hist_hdr, hist_size))
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|| (offsetof (struct real_gmon_hist_hdr, prof_rate)
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!= offsetof (struct gmon_hist_hdr, prof_rate))
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|| (offsetof (struct real_gmon_hist_hdr, dimen)
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!= offsetof (struct gmon_hist_hdr, dimen))
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|| (offsetof (struct real_gmon_hist_hdr, dimen_abbrev)
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!= offsetof (struct gmon_hist_hdr, dimen_abbrev)))
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abort ();
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thdr.low_pc = (char *) _gmonparam.lowpc - load_address;
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thdr.high_pc = (char *) _gmonparam.highpc - load_address;
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thdr.hist_size = _gmonparam.kcountsize / sizeof (HISTCOUNTER);
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thdr.prof_rate = __profile_frequency ();
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strncpy (thdr.dimen, "seconds", sizeof (thdr.dimen));
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thdr.dimen_abbrev = 's';
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__writev_nocancel_nostatus (fd, iov, 3);
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}
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}
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static void
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write_call_graph (int fd, u_long load_address)
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{
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#define NARCS_PER_WRITEV 32
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u_char tag = GMON_TAG_CG_ARC;
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struct gmon_cg_arc_record raw_arc[NARCS_PER_WRITEV]
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__attribute__ ((aligned (__alignof__ (char*))));
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ARCINDEX from_index, to_index;
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u_long from_len;
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u_long frompc;
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struct iovec iov[2 * NARCS_PER_WRITEV];
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int nfilled;
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for (nfilled = 0; nfilled < NARCS_PER_WRITEV; ++nfilled)
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{
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iov[2 * nfilled].iov_base = &tag;
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iov[2 * nfilled].iov_len = sizeof (tag);
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iov[2 * nfilled + 1].iov_base = &raw_arc[nfilled];
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iov[2 * nfilled + 1].iov_len = sizeof (struct gmon_cg_arc_record);
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}
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nfilled = 0;
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from_len = _gmonparam.fromssize / sizeof (*_gmonparam.froms);
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for (from_index = 0; from_index < from_len; ++from_index)
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{
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if (_gmonparam.froms[from_index] == 0)
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continue;
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frompc = _gmonparam.lowpc;
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frompc += (from_index * _gmonparam.hashfraction
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* sizeof (*_gmonparam.froms));
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for (to_index = _gmonparam.froms[from_index];
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to_index != 0;
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to_index = _gmonparam.tos[to_index].link)
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{
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struct arc
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{
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char *frompc;
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char *selfpc;
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int32_t count;
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}
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arc;
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arc.frompc = (char *) frompc - load_address;
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arc.selfpc = ((char *) _gmonparam.tos[to_index].selfpc
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- load_address);
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arc.count = _gmonparam.tos[to_index].count;
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memcpy (raw_arc + nfilled, &arc, sizeof (raw_arc [0]));
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if (++nfilled == NARCS_PER_WRITEV)
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{
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__writev_nocancel_nostatus (fd, iov, 2 * nfilled);
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nfilled = 0;
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}
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}
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}
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if (nfilled > 0)
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__writev_nocancel_nostatus (fd, iov, 2 * nfilled);
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}
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static void
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write_bb_counts (int fd)
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{
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struct __bb *grp;
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u_char tag = GMON_TAG_BB_COUNT;
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size_t ncounts;
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size_t i;
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struct iovec bbhead[2] =
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{
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{ &tag, sizeof (tag) },
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{ &ncounts, sizeof (ncounts) }
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};
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struct iovec bbbody[8];
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size_t nfilled;
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for (i = 0; i < (sizeof (bbbody) / sizeof (bbbody[0])); i += 2)
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{
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bbbody[i].iov_len = sizeof (grp->addresses[0]);
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bbbody[i + 1].iov_len = sizeof (grp->counts[0]);
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}
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/* Write each group of basic-block info (all basic-blocks in a
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compilation unit form a single group). */
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for (grp = __bb_head; grp; grp = grp->next)
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{
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ncounts = grp->ncounts;
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__writev_nocancel_nostatus (fd, bbhead, 2);
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for (nfilled = i = 0; i < ncounts; ++i)
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{
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if (nfilled > (sizeof (bbbody) / sizeof (bbbody[0])) - 2)
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{
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__writev_nocancel_nostatus (fd, bbbody, nfilled);
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nfilled = 0;
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}
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bbbody[nfilled++].iov_base = (char *) &grp->addresses[i];
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bbbody[nfilled++].iov_base = &grp->counts[i];
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}
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if (nfilled > 0)
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__writev_nocancel_nostatus (fd, bbbody, nfilled);
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}
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}
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static void
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write_gmon (void)
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{
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int fd = -1;
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char *env;
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env = getenv ("GMON_OUT_PREFIX");
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if (env != NULL && !__libc_enable_secure)
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{
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size_t len = strlen (env);
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char buf[len + 20];
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__snprintf (buf, sizeof (buf), "%s.%u", env, __getpid ());
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fd = __open_nocancel (buf, O_CREAT|O_TRUNC|O_WRONLY|O_NOFOLLOW, 0666);
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}
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if (fd == -1)
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{
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fd = __open_nocancel ("gmon.out", O_CREAT|O_TRUNC|O_WRONLY|O_NOFOLLOW,
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0666);
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if (fd < 0)
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{
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char buf[300];
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int errnum = errno;
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__fxprintf (NULL, "_mcleanup: gmon.out: %s\n",
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__strerror_r (errnum, buf, sizeof buf));
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return;
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}
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}
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/* write gmon.out header: */
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struct real_gmon_hdr
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{
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char cookie[4];
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int32_t version;
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char spare[3 * 4];
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} ghdr;
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if (sizeof (ghdr) != sizeof (struct gmon_hdr)
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|| (offsetof (struct real_gmon_hdr, cookie)
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!= offsetof (struct gmon_hdr, cookie))
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|| (offsetof (struct real_gmon_hdr, version)
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!= offsetof (struct gmon_hdr, version)))
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abort ();
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memcpy (&ghdr.cookie[0], GMON_MAGIC, sizeof (ghdr.cookie));
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ghdr.version = GMON_VERSION;
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memset (ghdr.spare, '\0', sizeof (ghdr.spare));
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__write_nocancel (fd, &ghdr, sizeof (struct gmon_hdr));
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/* Get load_address to profile PIE. */
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u_long load_address = 0;
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#ifdef PIC
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__dl_iterate_phdr (callback, &load_address);
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#endif
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/* write PC histogram: */
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write_hist (fd, load_address);
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/* write call-graph: */
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write_call_graph (fd, load_address);
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/* write basic-block execution counts: */
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write_bb_counts (fd);
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__close_nocancel_nostatus (fd);
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}
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void
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__write_profiling (void)
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{
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int save = _gmonparam.state;
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_gmonparam.state = GMON_PROF_OFF;
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if (save == GMON_PROF_ON)
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write_gmon ();
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_gmonparam.state = save;
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}
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#ifndef SHARED
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/* This symbol isn't used anywhere in the DSO and it is not exported.
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This would normally mean it should be removed to get the same API
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in static libraries. But since profiling is special in static libs
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anyway we keep it. But not when building the DSO since some
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quality assurance tests will otherwise trigger. */
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weak_alias (__write_profiling, write_profiling)
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#endif
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void
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_mcleanup (void)
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{
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__moncontrol (0);
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if (_gmonparam.state != GMON_PROF_ERROR)
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write_gmon ();
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/* free the memory. */
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free (_gmonparam.tos);
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}
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