4e8ee9cbf7
This patch adds functionality to libgcov to enable user applications to collect profile data only in regions of interest. This is useful, for example, to collect profile data from a long-running server only during the time when it is serving requests. Specifically, the new routines __gcov_reset will clear all profile counters to zero and __gcov_dump will write out the profile information collected so far. A global variable is used to prevent writing out the profile a second time during exit. 2012-05-08 Teresa Johnson <tejohnson@google.com> * libgcc/libgcov.c (gcov_clear, __gcov_reset): New functions. (__gcov_dump): Ditto. (gcov_dump_complete): New global variable. (gcov_exit): Export hidden to enable use in L_gcov_dump. (__gcov_flush): Outline functionality now in gcov_clear. * libgcc/Makefile.in (L_gcov_reset, L_gcov_dump): Define. * gcc/gcov-io.h (__gcov_reset, __gcov_dump): Declare. * gcc/doc/gcov.texi: Add note on using __gcov_reset and __gcov_dump. From-SVN: r187297
1201 lines
30 KiB
C
1201 lines
30 KiB
C
/* Routines required for instrumenting a program. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2010, 2011
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "tconfig.h"
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#include "tsystem.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "libgcc_tm.h"
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#include "gthr.h"
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#if defined(inhibit_libc)
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#define IN_LIBGCOV (-1)
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#else
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#define IN_LIBGCOV 1
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#if defined(L_gcov)
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#define GCOV_LINKAGE /* nothing */
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#endif
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#endif
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#include "gcov-io.h"
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#if defined(inhibit_libc)
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/* If libc and its header files are not available, provide dummy functions. */
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#ifdef L_gcov
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void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {}
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void __gcov_flush (void) {}
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#endif
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#ifdef L_gcov_reset
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void __gcov_reset (void) {}
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#endif
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#ifdef L_gcov_dump
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void __gcov_dump (void) {}
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#endif
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#ifdef L_gcov_merge_add
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void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)),
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unsigned n_counters __attribute__ ((unused))) {}
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#endif
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#ifdef L_gcov_merge_single
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void __gcov_merge_single (gcov_type *counters __attribute__ ((unused)),
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unsigned n_counters __attribute__ ((unused))) {}
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#endif
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#ifdef L_gcov_merge_delta
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void __gcov_merge_delta (gcov_type *counters __attribute__ ((unused)),
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unsigned n_counters __attribute__ ((unused))) {}
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#endif
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#else
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#include <string.h>
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#if GCOV_LOCKED
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#endif
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extern void gcov_clear (void) ATTRIBUTE_HIDDEN;
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extern void gcov_exit (void) ATTRIBUTE_HIDDEN;
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extern int gcov_dump_complete ATTRIBUTE_HIDDEN;
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#ifdef L_gcov
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#include "gcov-io.c"
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struct gcov_fn_buffer
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{
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struct gcov_fn_buffer *next;
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unsigned fn_ix;
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struct gcov_fn_info info;
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/* note gcov_fn_info ends in a trailing array. */
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};
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/* Chain of per-object gcov structures. */
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static struct gcov_info *gcov_list;
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/* Size of the longest file name. */
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static size_t gcov_max_filename = 0;
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/* Flag when the profile has already been dumped via __gcov_dump(). */
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int gcov_dump_complete = 0;
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/* Make sure path component of the given FILENAME exists, create
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missing directories. FILENAME must be writable.
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Returns zero on success, or -1 if an error occurred. */
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static int
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create_file_directory (char *filename)
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{
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#if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
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(void) filename;
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return -1;
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#else
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char *s;
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s = filename;
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if (HAS_DRIVE_SPEC(s))
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s += 2;
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if (IS_DIR_SEPARATOR(*s))
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++s;
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for (; *s != '\0'; s++)
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if (IS_DIR_SEPARATOR(*s))
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{
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char sep = *s;
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*s = '\0';
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/* Try to make directory if it doesn't already exist. */
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if (access (filename, F_OK) == -1
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#ifdef TARGET_POSIX_IO
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&& mkdir (filename, 0755) == -1
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#else
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&& mkdir (filename) == -1
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#endif
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/* The directory might have been made by another process. */
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&& errno != EEXIST)
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{
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fprintf (stderr, "profiling:%s:Cannot create directory\n",
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filename);
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*s = sep;
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return -1;
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};
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*s = sep;
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};
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return 0;
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#endif
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}
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static struct gcov_fn_buffer *
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free_fn_data (const struct gcov_info *gi_ptr, struct gcov_fn_buffer *buffer,
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unsigned limit)
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{
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struct gcov_fn_buffer *next;
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unsigned ix, n_ctr = 0;
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if (!buffer)
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return 0;
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next = buffer->next;
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for (ix = 0; ix != limit; ix++)
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if (gi_ptr->merge[ix])
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free (buffer->info.ctrs[n_ctr++].values);
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free (buffer);
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return next;
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}
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static struct gcov_fn_buffer **
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buffer_fn_data (const char *filename, const struct gcov_info *gi_ptr,
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struct gcov_fn_buffer **end_ptr, unsigned fn_ix)
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{
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unsigned n_ctrs = 0, ix = 0;
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struct gcov_fn_buffer *fn_buffer;
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unsigned len;
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for (ix = GCOV_COUNTERS; ix--;)
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if (gi_ptr->merge[ix])
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n_ctrs++;
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len = sizeof (*fn_buffer) + sizeof (fn_buffer->info.ctrs[0]) * n_ctrs;
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fn_buffer = (struct gcov_fn_buffer *)malloc (len);
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if (!fn_buffer)
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goto fail;
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fn_buffer->next = 0;
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fn_buffer->fn_ix = fn_ix;
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fn_buffer->info.ident = gcov_read_unsigned ();
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fn_buffer->info.lineno_checksum = gcov_read_unsigned ();
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fn_buffer->info.cfg_checksum = gcov_read_unsigned ();
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for (n_ctrs = ix = 0; ix != GCOV_COUNTERS; ix++)
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{
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gcov_unsigned_t length;
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gcov_type *values;
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if (!gi_ptr->merge[ix])
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continue;
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if (gcov_read_unsigned () != GCOV_TAG_FOR_COUNTER (ix))
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{
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len = 0;
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goto fail;
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}
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length = GCOV_TAG_COUNTER_NUM (gcov_read_unsigned ());
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len = length * sizeof (gcov_type);
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values = (gcov_type *)malloc (len);
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if (!values)
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goto fail;
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fn_buffer->info.ctrs[n_ctrs].num = length;
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fn_buffer->info.ctrs[n_ctrs].values = values;
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while (length--)
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*values++ = gcov_read_counter ();
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n_ctrs++;
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}
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*end_ptr = fn_buffer;
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return &fn_buffer->next;
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fail:
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fprintf (stderr, "profiling:%s:Function %u %s %u \n", filename, fn_ix,
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len ? "cannot allocate" : "counter mismatch", len ? len : ix);
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return (struct gcov_fn_buffer **)free_fn_data (gi_ptr, fn_buffer, ix);
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}
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/* Add an unsigned value to the current crc */
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static gcov_unsigned_t
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crc32_unsigned (gcov_unsigned_t crc32, gcov_unsigned_t value)
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{
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unsigned ix;
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for (ix = 32; ix--; value <<= 1)
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{
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unsigned feedback;
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feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0;
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crc32 <<= 1;
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crc32 ^= feedback;
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}
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return crc32;
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}
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/* Check if VERSION of the info block PTR matches libgcov one.
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Return 1 on success, or zero in case of versions mismatch.
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If FILENAME is not NULL, its value used for reporting purposes
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instead of value from the info block. */
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static int
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gcov_version (struct gcov_info *ptr, gcov_unsigned_t version,
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const char *filename)
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{
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if (version != GCOV_VERSION)
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{
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char v[4], e[4];
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GCOV_UNSIGNED2STRING (v, version);
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GCOV_UNSIGNED2STRING (e, GCOV_VERSION);
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fprintf (stderr,
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"profiling:%s:Version mismatch - expected %.4s got %.4s\n",
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filename? filename : ptr->filename, e, v);
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return 0;
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}
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return 1;
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}
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/* Dump the coverage counts. We merge with existing counts when
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possible, to avoid growing the .da files ad infinitum. We use this
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program's checksum to make sure we only accumulate whole program
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statistics to the correct summary. An object file might be embedded
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in two separate programs, and we must keep the two program
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summaries separate. */
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void
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gcov_exit (void)
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{
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struct gcov_info *gi_ptr;
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const struct gcov_fn_info *gfi_ptr;
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struct gcov_summary this_prg; /* summary for program. */
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struct gcov_summary all_prg; /* summary for all instances of program. */
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struct gcov_ctr_summary *cs_ptr;
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const struct gcov_ctr_info *ci_ptr;
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unsigned t_ix;
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int f_ix;
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gcov_unsigned_t c_num;
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const char *gcov_prefix;
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int gcov_prefix_strip = 0;
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size_t prefix_length;
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char *gi_filename, *gi_filename_up;
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gcov_unsigned_t crc32 = 0;
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/* Prevent the counters from being dumped a second time on exit when the
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application already wrote out the profile using __gcov_dump(). */
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if (gcov_dump_complete)
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return;
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memset (&all_prg, 0, sizeof (all_prg));
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/* Find the totals for this execution. */
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memset (&this_prg, 0, sizeof (this_prg));
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for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
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{
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crc32 = crc32_unsigned (crc32, gi_ptr->stamp);
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crc32 = crc32_unsigned (crc32, gi_ptr->n_functions);
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for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++)
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{
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gfi_ptr = gi_ptr->functions[f_ix];
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if (gfi_ptr && gfi_ptr->key != gi_ptr)
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gfi_ptr = 0;
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crc32 = crc32_unsigned (crc32, gfi_ptr ? gfi_ptr->cfg_checksum : 0);
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crc32 = crc32_unsigned (crc32,
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gfi_ptr ? gfi_ptr->lineno_checksum : 0);
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if (!gfi_ptr)
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continue;
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ci_ptr = gfi_ptr->ctrs;
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for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++)
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{
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if (!gi_ptr->merge[t_ix])
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continue;
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cs_ptr = &this_prg.ctrs[t_ix];
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cs_ptr->num += ci_ptr->num;
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crc32 = crc32_unsigned (crc32, ci_ptr->num);
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for (c_num = 0; c_num < ci_ptr->num; c_num++)
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{
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cs_ptr->sum_all += ci_ptr->values[c_num];
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if (cs_ptr->run_max < ci_ptr->values[c_num])
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cs_ptr->run_max = ci_ptr->values[c_num];
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}
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ci_ptr++;
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}
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}
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}
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{
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|
/* Check if the level of dirs to strip off specified. */
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char *tmp = getenv("GCOV_PREFIX_STRIP");
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if (tmp)
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{
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gcov_prefix_strip = atoi (tmp);
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/* Do not consider negative values. */
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if (gcov_prefix_strip < 0)
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gcov_prefix_strip = 0;
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}
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}
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|
|
/* Get file name relocation prefix. Non-absolute values are ignored. */
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|
gcov_prefix = getenv("GCOV_PREFIX");
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|
if (gcov_prefix)
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{
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prefix_length = strlen(gcov_prefix);
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|
|
/* Remove an unnecessary trailing '/' */
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|
if (IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))
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prefix_length--;
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|
}
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else
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prefix_length = 0;
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|
|
/* If no prefix was specified and a prefix stip, then we assume
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relative. */
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|
if (gcov_prefix_strip != 0 && prefix_length == 0)
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{
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|
gcov_prefix = ".";
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|
prefix_length = 1;
|
|
}
|
|
/* Allocate and initialize the filename scratch space plus one. */
|
|
gi_filename = (char *) alloca (prefix_length + gcov_max_filename + 2);
|
|
if (prefix_length)
|
|
memcpy (gi_filename, gcov_prefix, prefix_length);
|
|
gi_filename_up = gi_filename + prefix_length;
|
|
|
|
/* Now merge each file. */
|
|
for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
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|
{
|
|
unsigned n_counts;
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|
struct gcov_summary prg; /* summary for this object over all
|
|
program. */
|
|
struct gcov_ctr_summary *cs_prg, *cs_tprg, *cs_all;
|
|
int error = 0;
|
|
gcov_unsigned_t tag, length;
|
|
gcov_position_t summary_pos = 0;
|
|
gcov_position_t eof_pos = 0;
|
|
const char *fname, *s;
|
|
struct gcov_fn_buffer *fn_buffer = 0;
|
|
struct gcov_fn_buffer **fn_tail = &fn_buffer;
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|
|
|
fname = gi_ptr->filename;
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|
|
|
/* Avoid to add multiple drive letters into combined path. */
|
|
if (prefix_length != 0 && HAS_DRIVE_SPEC(fname))
|
|
fname += 2;
|
|
|
|
/* Build relocated filename, stripping off leading
|
|
directories from the initial filename if requested. */
|
|
if (gcov_prefix_strip > 0)
|
|
{
|
|
int level = 0;
|
|
s = fname;
|
|
if (IS_DIR_SEPARATOR(*s))
|
|
++s;
|
|
|
|
/* Skip selected directory levels. */
|
|
for (; (*s != '\0') && (level < gcov_prefix_strip); s++)
|
|
if (IS_DIR_SEPARATOR(*s))
|
|
{
|
|
fname = s;
|
|
level++;
|
|
}
|
|
}
|
|
|
|
/* Update complete filename with stripped original. */
|
|
if (prefix_length != 0 && !IS_DIR_SEPARATOR (*fname))
|
|
{
|
|
/* If prefix is given, add directory separator. */
|
|
strcpy (gi_filename_up, "/");
|
|
strcpy (gi_filename_up + 1, fname);
|
|
}
|
|
else
|
|
strcpy (gi_filename_up, fname);
|
|
|
|
if (!gcov_open (gi_filename))
|
|
{
|
|
/* Open failed likely due to missed directory.
|
|
Create directory and retry to open file. */
|
|
if (create_file_directory (gi_filename))
|
|
{
|
|
fprintf (stderr, "profiling:%s:Skip\n", gi_filename);
|
|
continue;
|
|
}
|
|
if (!gcov_open (gi_filename))
|
|
{
|
|
fprintf (stderr, "profiling:%s:Cannot open\n", gi_filename);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
tag = gcov_read_unsigned ();
|
|
if (tag)
|
|
{
|
|
/* Merge data from file. */
|
|
if (tag != GCOV_DATA_MAGIC)
|
|
{
|
|
fprintf (stderr, "profiling:%s:Not a gcov data file\n",
|
|
gi_filename);
|
|
goto read_fatal;
|
|
}
|
|
length = gcov_read_unsigned ();
|
|
if (!gcov_version (gi_ptr, length, gi_filename))
|
|
goto read_fatal;
|
|
|
|
length = gcov_read_unsigned ();
|
|
if (length != gi_ptr->stamp)
|
|
/* Read from a different compilation. Overwrite the file. */
|
|
goto rewrite;
|
|
|
|
/* Look for program summary. */
|
|
for (f_ix = 0;;)
|
|
{
|
|
struct gcov_summary tmp;
|
|
|
|
eof_pos = gcov_position ();
|
|
tag = gcov_read_unsigned ();
|
|
if (tag != GCOV_TAG_PROGRAM_SUMMARY)
|
|
break;
|
|
|
|
f_ix--;
|
|
length = gcov_read_unsigned ();
|
|
if (length != GCOV_TAG_SUMMARY_LENGTH)
|
|
goto read_mismatch;
|
|
gcov_read_summary (&tmp);
|
|
if ((error = gcov_is_error ()))
|
|
goto read_error;
|
|
if (summary_pos || tmp.checksum != crc32)
|
|
goto next_summary;
|
|
|
|
for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++)
|
|
if (tmp.ctrs[t_ix].num != this_prg.ctrs[t_ix].num)
|
|
goto next_summary;
|
|
prg = tmp;
|
|
summary_pos = eof_pos;
|
|
|
|
next_summary:;
|
|
}
|
|
|
|
/* Merge execution counts for each function. */
|
|
for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions;
|
|
f_ix++, tag = gcov_read_unsigned ())
|
|
{
|
|
gfi_ptr = gi_ptr->functions[f_ix];
|
|
|
|
if (tag != GCOV_TAG_FUNCTION)
|
|
goto read_mismatch;
|
|
|
|
length = gcov_read_unsigned ();
|
|
if (!length)
|
|
/* This function did not appear in the other program.
|
|
We have nothing to merge. */
|
|
continue;
|
|
|
|
if (length != GCOV_TAG_FUNCTION_LENGTH)
|
|
goto read_mismatch;
|
|
|
|
if (!gfi_ptr || gfi_ptr->key != gi_ptr)
|
|
{
|
|
/* This function appears in the other program. We
|
|
need to buffer the information in order to write
|
|
it back out -- we'll be inserting data before
|
|
this point, so cannot simply keep the data in the
|
|
file. */
|
|
fn_tail = buffer_fn_data (gi_filename,
|
|
gi_ptr, fn_tail, f_ix);
|
|
if (!fn_tail)
|
|
goto read_mismatch;
|
|
continue;
|
|
}
|
|
|
|
length = gcov_read_unsigned ();
|
|
if (length != gfi_ptr->ident)
|
|
goto read_mismatch;
|
|
|
|
length = gcov_read_unsigned ();
|
|
if (length != gfi_ptr->lineno_checksum)
|
|
goto read_mismatch;
|
|
|
|
length = gcov_read_unsigned ();
|
|
if (length != gfi_ptr->cfg_checksum)
|
|
goto read_mismatch;
|
|
|
|
ci_ptr = gfi_ptr->ctrs;
|
|
for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)
|
|
{
|
|
gcov_merge_fn merge = gi_ptr->merge[t_ix];
|
|
|
|
if (!merge)
|
|
continue;
|
|
|
|
tag = gcov_read_unsigned ();
|
|
length = gcov_read_unsigned ();
|
|
if (tag != GCOV_TAG_FOR_COUNTER (t_ix)
|
|
|| length != GCOV_TAG_COUNTER_LENGTH (ci_ptr->num))
|
|
goto read_mismatch;
|
|
(*merge) (ci_ptr->values, ci_ptr->num);
|
|
ci_ptr++;
|
|
}
|
|
if ((error = gcov_is_error ()))
|
|
goto read_error;
|
|
}
|
|
|
|
if (tag)
|
|
{
|
|
read_mismatch:;
|
|
fprintf (stderr, "profiling:%s:Merge mismatch for %s %u\n",
|
|
gi_filename, f_ix >= 0 ? "function" : "summary",
|
|
f_ix < 0 ? -1 - f_ix : f_ix);
|
|
goto read_fatal;
|
|
}
|
|
}
|
|
goto rewrite;
|
|
|
|
read_error:;
|
|
fprintf (stderr, "profiling:%s:%s merging\n", gi_filename,
|
|
error < 0 ? "Overflow": "Error");
|
|
|
|
goto read_fatal;
|
|
|
|
rewrite:;
|
|
gcov_rewrite ();
|
|
if (!summary_pos)
|
|
{
|
|
memset (&prg, 0, sizeof (prg));
|
|
summary_pos = eof_pos;
|
|
}
|
|
|
|
/* Merge the summaries. */
|
|
for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)
|
|
{
|
|
cs_prg = &prg.ctrs[t_ix];
|
|
cs_tprg = &this_prg.ctrs[t_ix];
|
|
cs_all = &all_prg.ctrs[t_ix];
|
|
|
|
if (gi_ptr->merge[t_ix])
|
|
{
|
|
if (!cs_prg->runs++)
|
|
cs_prg->num = cs_tprg->num;
|
|
cs_prg->sum_all += cs_tprg->sum_all;
|
|
if (cs_prg->run_max < cs_tprg->run_max)
|
|
cs_prg->run_max = cs_tprg->run_max;
|
|
cs_prg->sum_max += cs_tprg->run_max;
|
|
}
|
|
else if (cs_prg->runs)
|
|
goto read_mismatch;
|
|
|
|
if (!cs_all->runs && cs_prg->runs)
|
|
memcpy (cs_all, cs_prg, sizeof (*cs_all));
|
|
else if (!all_prg.checksum
|
|
&& (!GCOV_LOCKED || cs_all->runs == cs_prg->runs)
|
|
&& memcmp (cs_all, cs_prg, sizeof (*cs_all)))
|
|
{
|
|
fprintf (stderr, "profiling:%s:Invocation mismatch - some data files may have been removed%s\n",
|
|
gi_filename, GCOV_LOCKED
|
|
? "" : " or concurrently updated without locking support");
|
|
all_prg.checksum = ~0u;
|
|
}
|
|
}
|
|
|
|
prg.checksum = crc32;
|
|
|
|
/* Write out the data. */
|
|
if (!eof_pos)
|
|
{
|
|
gcov_write_tag_length (GCOV_DATA_MAGIC, GCOV_VERSION);
|
|
gcov_write_unsigned (gi_ptr->stamp);
|
|
}
|
|
|
|
if (summary_pos)
|
|
gcov_seek (summary_pos);
|
|
|
|
/* Generate whole program statistics. */
|
|
gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &prg);
|
|
|
|
if (summary_pos < eof_pos)
|
|
gcov_seek (eof_pos);
|
|
|
|
/* Write execution counts for each function. */
|
|
for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++)
|
|
{
|
|
unsigned buffered = 0;
|
|
|
|
if (fn_buffer && fn_buffer->fn_ix == (unsigned)f_ix)
|
|
{
|
|
/* Buffered data from another program. */
|
|
buffered = 1;
|
|
gfi_ptr = &fn_buffer->info;
|
|
length = GCOV_TAG_FUNCTION_LENGTH;
|
|
}
|
|
else
|
|
{
|
|
gfi_ptr = gi_ptr->functions[f_ix];
|
|
if (gfi_ptr && gfi_ptr->key == gi_ptr)
|
|
length = GCOV_TAG_FUNCTION_LENGTH;
|
|
else
|
|
length = 0;
|
|
}
|
|
|
|
gcov_write_tag_length (GCOV_TAG_FUNCTION, length);
|
|
if (!length)
|
|
continue;
|
|
|
|
gcov_write_unsigned (gfi_ptr->ident);
|
|
gcov_write_unsigned (gfi_ptr->lineno_checksum);
|
|
gcov_write_unsigned (gfi_ptr->cfg_checksum);
|
|
|
|
ci_ptr = gfi_ptr->ctrs;
|
|
for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)
|
|
{
|
|
if (!gi_ptr->merge[t_ix])
|
|
continue;
|
|
|
|
n_counts = ci_ptr->num;
|
|
gcov_write_tag_length (GCOV_TAG_FOR_COUNTER (t_ix),
|
|
GCOV_TAG_COUNTER_LENGTH (n_counts));
|
|
gcov_type *c_ptr = ci_ptr->values;
|
|
while (n_counts--)
|
|
gcov_write_counter (*c_ptr++);
|
|
ci_ptr++;
|
|
}
|
|
if (buffered)
|
|
fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
|
|
}
|
|
|
|
gcov_write_unsigned (0);
|
|
|
|
read_fatal:;
|
|
while (fn_buffer)
|
|
fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
|
|
|
|
if ((error = gcov_close ()))
|
|
fprintf (stderr, error < 0 ?
|
|
"profiling:%s:Overflow writing\n" :
|
|
"profiling:%s:Error writing\n",
|
|
gi_filename);
|
|
}
|
|
}
|
|
|
|
/* Reset all counters to zero. */
|
|
|
|
void
|
|
gcov_clear (void)
|
|
{
|
|
const struct gcov_info *gi_ptr;
|
|
|
|
for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
|
|
{
|
|
unsigned f_ix;
|
|
|
|
for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)
|
|
{
|
|
unsigned t_ix;
|
|
const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];
|
|
|
|
if (!gfi_ptr || gfi_ptr->key != gi_ptr)
|
|
continue;
|
|
const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs;
|
|
for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
|
|
{
|
|
if (!gi_ptr->merge[t_ix])
|
|
continue;
|
|
|
|
memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num);
|
|
ci_ptr++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Add a new object file onto the bb chain. Invoked automatically
|
|
when running an object file's global ctors. */
|
|
|
|
void
|
|
__gcov_init (struct gcov_info *info)
|
|
{
|
|
if (!info->version || !info->n_functions)
|
|
return;
|
|
if (gcov_version (info, info->version, 0))
|
|
{
|
|
size_t filename_length = strlen(info->filename);
|
|
|
|
/* Refresh the longest file name information */
|
|
if (filename_length > gcov_max_filename)
|
|
gcov_max_filename = filename_length;
|
|
|
|
if (!gcov_list)
|
|
atexit (gcov_exit);
|
|
|
|
info->next = gcov_list;
|
|
gcov_list = info;
|
|
}
|
|
info->version = 0;
|
|
}
|
|
|
|
#ifdef __GTHREAD_MUTEX_INIT
|
|
ATTRIBUTE_HIDDEN __gthread_mutex_t __gcov_flush_mx = __GTHREAD_MUTEX_INIT;
|
|
#define init_mx_once()
|
|
#else
|
|
__gthread_mutex_t __gcov_flush_mx ATTRIBUTE_HIDDEN;
|
|
|
|
static void
|
|
init_mx (void)
|
|
{
|
|
__GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx);
|
|
}
|
|
static void
|
|
init_mx_once (void)
|
|
{
|
|
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
|
|
__gthread_once (&once, init_mx);
|
|
}
|
|
#endif
|
|
|
|
/* Called before fork or exec - write out profile information gathered so
|
|
far and reset it to zero. This avoids duplication or loss of the
|
|
profile information gathered so far. */
|
|
|
|
void
|
|
__gcov_flush (void)
|
|
{
|
|
init_mx_once ();
|
|
__gthread_mutex_lock (&__gcov_flush_mx);
|
|
|
|
gcov_exit ();
|
|
gcov_clear ();
|
|
|
|
__gthread_mutex_unlock (&__gcov_flush_mx);
|
|
}
|
|
|
|
#endif /* L_gcov */
|
|
|
|
#ifdef L_gcov_reset
|
|
|
|
/* Function that can be called from application to reset counters to zero,
|
|
in order to collect profile in region of interest. */
|
|
|
|
void
|
|
__gcov_reset (void)
|
|
{
|
|
gcov_clear ();
|
|
/* Re-enable dumping to support collecting profile in multiple regions
|
|
of interest. */
|
|
gcov_dump_complete = 0;
|
|
}
|
|
|
|
#endif /* L_gcov_reset */
|
|
|
|
#ifdef L_gcov_dump
|
|
|
|
/* Function that can be called from application to write profile collected
|
|
so far, in order to collect profile in region of interest. */
|
|
|
|
void
|
|
__gcov_dump (void)
|
|
{
|
|
gcov_exit ();
|
|
/* Prevent profile from being dumped a second time on application exit. */
|
|
gcov_dump_complete = 1;
|
|
}
|
|
|
|
#endif /* L_gcov_dump */
|
|
|
|
#ifdef L_gcov_merge_add
|
|
/* The profile merging function that just adds the counters. It is given
|
|
an array COUNTERS of N_COUNTERS old counters and it reads the same number
|
|
of counters from the gcov file. */
|
|
void
|
|
__gcov_merge_add (gcov_type *counters, unsigned n_counters)
|
|
{
|
|
for (; n_counters; counters++, n_counters--)
|
|
*counters += gcov_read_counter ();
|
|
}
|
|
#endif /* L_gcov_merge_add */
|
|
|
|
#ifdef L_gcov_merge_ior
|
|
/* The profile merging function that just adds the counters. It is given
|
|
an array COUNTERS of N_COUNTERS old counters and it reads the same number
|
|
of counters from the gcov file. */
|
|
void
|
|
__gcov_merge_ior (gcov_type *counters, unsigned n_counters)
|
|
{
|
|
for (; n_counters; counters++, n_counters--)
|
|
*counters |= gcov_read_counter ();
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_merge_single
|
|
/* The profile merging function for choosing the most common value.
|
|
It is given an array COUNTERS of N_COUNTERS old counters and it
|
|
reads the same number of counters from the gcov file. The counters
|
|
are split into 3-tuples where the members of the tuple have
|
|
meanings:
|
|
|
|
-- the stored candidate on the most common value of the measured entity
|
|
-- counter
|
|
-- total number of evaluations of the value */
|
|
void
|
|
__gcov_merge_single (gcov_type *counters, unsigned n_counters)
|
|
{
|
|
unsigned i, n_measures;
|
|
gcov_type value, counter, all;
|
|
|
|
gcc_assert (!(n_counters % 3));
|
|
n_measures = n_counters / 3;
|
|
for (i = 0; i < n_measures; i++, counters += 3)
|
|
{
|
|
value = gcov_read_counter ();
|
|
counter = gcov_read_counter ();
|
|
all = gcov_read_counter ();
|
|
|
|
if (counters[0] == value)
|
|
counters[1] += counter;
|
|
else if (counter > counters[1])
|
|
{
|
|
counters[0] = value;
|
|
counters[1] = counter - counters[1];
|
|
}
|
|
else
|
|
counters[1] -= counter;
|
|
counters[2] += all;
|
|
}
|
|
}
|
|
#endif /* L_gcov_merge_single */
|
|
|
|
#ifdef L_gcov_merge_delta
|
|
/* The profile merging function for choosing the most common
|
|
difference between two consecutive evaluations of the value. It is
|
|
given an array COUNTERS of N_COUNTERS old counters and it reads the
|
|
same number of counters from the gcov file. The counters are split
|
|
into 4-tuples where the members of the tuple have meanings:
|
|
|
|
-- the last value of the measured entity
|
|
-- the stored candidate on the most common difference
|
|
-- counter
|
|
-- total number of evaluations of the value */
|
|
void
|
|
__gcov_merge_delta (gcov_type *counters, unsigned n_counters)
|
|
{
|
|
unsigned i, n_measures;
|
|
gcov_type value, counter, all;
|
|
|
|
gcc_assert (!(n_counters % 4));
|
|
n_measures = n_counters / 4;
|
|
for (i = 0; i < n_measures; i++, counters += 4)
|
|
{
|
|
/* last = */ gcov_read_counter ();
|
|
value = gcov_read_counter ();
|
|
counter = gcov_read_counter ();
|
|
all = gcov_read_counter ();
|
|
|
|
if (counters[1] == value)
|
|
counters[2] += counter;
|
|
else if (counter > counters[2])
|
|
{
|
|
counters[1] = value;
|
|
counters[2] = counter - counters[2];
|
|
}
|
|
else
|
|
counters[2] -= counter;
|
|
counters[3] += all;
|
|
}
|
|
}
|
|
#endif /* L_gcov_merge_delta */
|
|
|
|
#ifdef L_gcov_interval_profiler
|
|
/* If VALUE is in interval <START, START + STEPS - 1>, then increases the
|
|
corresponding counter in COUNTERS. If the VALUE is above or below
|
|
the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased
|
|
instead. */
|
|
|
|
void
|
|
__gcov_interval_profiler (gcov_type *counters, gcov_type value,
|
|
int start, unsigned steps)
|
|
{
|
|
gcov_type delta = value - start;
|
|
if (delta < 0)
|
|
counters[steps + 1]++;
|
|
else if (delta >= steps)
|
|
counters[steps]++;
|
|
else
|
|
counters[delta]++;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_pow2_profiler
|
|
/* If VALUE is a power of two, COUNTERS[1] is incremented. Otherwise
|
|
COUNTERS[0] is incremented. */
|
|
|
|
void
|
|
__gcov_pow2_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
if (value & (value - 1))
|
|
counters[0]++;
|
|
else
|
|
counters[1]++;
|
|
}
|
|
#endif
|
|
|
|
/* Tries to determine the most common value among its inputs. Checks if the
|
|
value stored in COUNTERS[0] matches VALUE. If this is the case, COUNTERS[1]
|
|
is incremented. If this is not the case and COUNTERS[1] is not zero,
|
|
COUNTERS[1] is decremented. Otherwise COUNTERS[1] is set to one and
|
|
VALUE is stored to COUNTERS[0]. This algorithm guarantees that if this
|
|
function is called more than 50% of the time with one value, this value
|
|
will be in COUNTERS[0] in the end.
|
|
|
|
In any case, COUNTERS[2] is incremented. */
|
|
|
|
static inline void
|
|
__gcov_one_value_profiler_body (gcov_type *counters, gcov_type value)
|
|
{
|
|
if (value == counters[0])
|
|
counters[1]++;
|
|
else if (counters[1] == 0)
|
|
{
|
|
counters[1] = 1;
|
|
counters[0] = value;
|
|
}
|
|
else
|
|
counters[1]--;
|
|
counters[2]++;
|
|
}
|
|
|
|
#ifdef L_gcov_one_value_profiler
|
|
void
|
|
__gcov_one_value_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
__gcov_one_value_profiler_body (counters, value);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_indirect_call_profiler
|
|
|
|
/* By default, the C++ compiler will use function addresses in the
|
|
vtable entries. Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero
|
|
tells the compiler to use function descriptors instead. The value
|
|
of this macro says how many words wide the descriptor is (normally 2),
|
|
but it may be dependent on target flags. Since we do not have access
|
|
to the target flags here we just check to see if it is set and use
|
|
that to set VTABLE_USES_DESCRIPTORS to 0 or 1.
|
|
|
|
It is assumed that the address of a function descriptor may be treated
|
|
as a pointer to a function. */
|
|
|
|
#ifdef TARGET_VTABLE_USES_DESCRIPTORS
|
|
#define VTABLE_USES_DESCRIPTORS 1
|
|
#else
|
|
#define VTABLE_USES_DESCRIPTORS 0
|
|
#endif
|
|
|
|
/* Tries to determine the most common value among its inputs. */
|
|
void
|
|
__gcov_indirect_call_profiler (gcov_type* counter, gcov_type value,
|
|
void* cur_func, void* callee_func)
|
|
{
|
|
/* If the C++ virtual tables contain function descriptors then one
|
|
function may have multiple descriptors and we need to dereference
|
|
the descriptors to see if they point to the same function. */
|
|
if (cur_func == callee_func
|
|
|| (VTABLE_USES_DESCRIPTORS && callee_func
|
|
&& *(void **) cur_func == *(void **) callee_func))
|
|
__gcov_one_value_profiler_body (counter, value);
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef L_gcov_average_profiler
|
|
/* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want
|
|
to saturate up. */
|
|
|
|
void
|
|
__gcov_average_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
counters[0] += value;
|
|
counters[1] ++;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_ior_profiler
|
|
/* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want
|
|
to saturate up. */
|
|
|
|
void
|
|
__gcov_ior_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
*counters |= value;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_fork
|
|
/* A wrapper for the fork function. Flushes the accumulated profiling data, so
|
|
that they are not counted twice. */
|
|
|
|
pid_t
|
|
__gcov_fork (void)
|
|
{
|
|
pid_t pid;
|
|
extern __gthread_mutex_t __gcov_flush_mx;
|
|
__gcov_flush ();
|
|
pid = fork ();
|
|
if (pid == 0)
|
|
__GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx);
|
|
return pid;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_execl
|
|
/* A wrapper for the execl function. Flushes the accumulated profiling data, so
|
|
that they are not lost. */
|
|
|
|
int
|
|
__gcov_execl (const char *path, char *arg, ...)
|
|
{
|
|
va_list ap, aq;
|
|
unsigned i, length;
|
|
char **args;
|
|
|
|
__gcov_flush ();
|
|
|
|
va_start (ap, arg);
|
|
va_copy (aq, ap);
|
|
|
|
length = 2;
|
|
while (va_arg (ap, char *))
|
|
length++;
|
|
va_end (ap);
|
|
|
|
args = (char **) alloca (length * sizeof (void *));
|
|
args[0] = arg;
|
|
for (i = 1; i < length; i++)
|
|
args[i] = va_arg (aq, char *);
|
|
va_end (aq);
|
|
|
|
return execv (path, args);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_execlp
|
|
/* A wrapper for the execlp function. Flushes the accumulated profiling data, so
|
|
that they are not lost. */
|
|
|
|
int
|
|
__gcov_execlp (const char *path, char *arg, ...)
|
|
{
|
|
va_list ap, aq;
|
|
unsigned i, length;
|
|
char **args;
|
|
|
|
__gcov_flush ();
|
|
|
|
va_start (ap, arg);
|
|
va_copy (aq, ap);
|
|
|
|
length = 2;
|
|
while (va_arg (ap, char *))
|
|
length++;
|
|
va_end (ap);
|
|
|
|
args = (char **) alloca (length * sizeof (void *));
|
|
args[0] = arg;
|
|
for (i = 1; i < length; i++)
|
|
args[i] = va_arg (aq, char *);
|
|
va_end (aq);
|
|
|
|
return execvp (path, args);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_execle
|
|
/* A wrapper for the execle function. Flushes the accumulated profiling data, so
|
|
that they are not lost. */
|
|
|
|
int
|
|
__gcov_execle (const char *path, char *arg, ...)
|
|
{
|
|
va_list ap, aq;
|
|
unsigned i, length;
|
|
char **args;
|
|
char **envp;
|
|
|
|
__gcov_flush ();
|
|
|
|
va_start (ap, arg);
|
|
va_copy (aq, ap);
|
|
|
|
length = 2;
|
|
while (va_arg (ap, char *))
|
|
length++;
|
|
va_end (ap);
|
|
|
|
args = (char **) alloca (length * sizeof (void *));
|
|
args[0] = arg;
|
|
for (i = 1; i < length; i++)
|
|
args[i] = va_arg (aq, char *);
|
|
envp = va_arg (aq, char **);
|
|
va_end (aq);
|
|
|
|
return execve (path, args, envp);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_execv
|
|
/* A wrapper for the execv function. Flushes the accumulated profiling data, so
|
|
that they are not lost. */
|
|
|
|
int
|
|
__gcov_execv (const char *path, char *const argv[])
|
|
{
|
|
__gcov_flush ();
|
|
return execv (path, argv);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_execvp
|
|
/* A wrapper for the execvp function. Flushes the accumulated profiling data, so
|
|
that they are not lost. */
|
|
|
|
int
|
|
__gcov_execvp (const char *path, char *const argv[])
|
|
{
|
|
__gcov_flush ();
|
|
return execvp (path, argv);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_execve
|
|
/* A wrapper for the execve function. Flushes the accumulated profiling data, so
|
|
that they are not lost. */
|
|
|
|
int
|
|
__gcov_execve (const char *path, char *const argv[], char *const envp[])
|
|
{
|
|
__gcov_flush ();
|
|
return execve (path, argv, envp);
|
|
}
|
|
#endif
|
|
#endif /* inhibit_libc */
|