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The patch re-factors libgcov.c to make it better modulelized.

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2013-11-12  Rong Xu  <xur@google.com>

The patch re-factors libgcov.c to make it better modulelized.
It contains two pieces of work:
1. break gcov_exit() into the following structure:
   gcov_exit()
      --> gcov_exit_compute_summary()
      --> allocate_filename_struct()
          for gi_ptr in gcov_list
            --> gcov_exit_dump_gcov()
                   --> gcov_exit_open_gcda_file()
                   --> gcov_exit_merge_gcda ()
                   --> gcov_exit_merge_summary ()
                   --> gcov_exit_write_gcda ()
2. split libgcov.c into the following files:
     libgcov-profiler.c
     libgcov-merge.c
     libgcov-interface.c
     libgcov-driver.c
       libgcov-driver-system.c (source included into libgcov-driver.c)

	* libgcc/libgcov.c: Delete as part of re-factoring.
	* gcc/gcov-io.h (__gcov_indirect_call_profiler): Add the decl to
        avoid warning.
	* libgcc/libgcov-interface.c (init_mx): Moved from libgcov.c.
	(init_mx_once): Ditto.
	(__gcov_flush): Ditto.
	(__gcov_reset): Ditto.
	(__gcov_dump): Ditto.
	(__gcov_fork): Ditto.
	(__gcov_execl): Ditto.
	(__gcov_execlp): Ditto.
	(__gcov_execle): Ditto.
	(__gcov_execv): Ditto.
	(__gcov_execvp): Ditto.
	(__gcov_execve): Ditto.
        * libgcc/libgcov-merge.c (__gcov_merge_time_profile): Moved from
        libgcov.c.
	(__gcov_merge_add): Ditto.
	(__gcov_merge_ior): Ditto.
	(__gcov_merge_single): Ditto.
	(__gcov_merge_delta): Ditto.
	* libgcc/libgcov-profiler.c 
	(__gcov_interval_profiler): Ditto.
	(__gcov_pow2_profiler): Ditto.
	(__gcov_one_value_profiler_body): Ditto.
	(__gcov_one_value_profiler): Ditto.
	(__gcov_indirect_call_profiler): Ditto.
	(__gcov_indirect_call_profiler_v2): Ditto.
	(__gcov_time_profiler): Ditto.
	(__gcov_average_profiler): Ditto.
	(__gcov_ior_profiler): Ditto.
	* libgcc/libgcov-driver.c (set_gcov_list): New.
	(get_gcov_dump_complete): Ditto.
	(set_gcov_dump_complete):Ditto.
	(reset_gcov_dump_complete):Ditto.
	(gcov_exit_compute_summary): New function split from gcov_exit().
	(gcov_exit_merge_gcda): Ditto.
	(gcov_exit_write_gcda): Ditto.
	(gcov_exit_merge_summary): Ditto.
	(gcov_exit_dump_gcov): Ditto.
	(struct gcov_fn_buffer): Moved from libgcov.c
	(struct gcov_summary_buffer): Ditto.
	(free_fn_data): Ditto.
	(buffer_fn_data): Ditto.
	(crc32_unsigned): Ditto.
	(gcov_version): Ditto.
	(gcov_histogram_insert): Ditto.
	(gcov_compute_histogram): Ditto.
	(gcov_exit): Ditto.
	(gcov_clear): Ditto.
	(__gcov_init): Ditto.
        (this_prg): Make it file scope static variable.
        (all_prg): Ditto.
        (crc32): Ditto.
        (gi_filename): Ditto.
        (fn_buffer): Ditto.
        (sum_buffer): Ditto.
        (struct gcov_filename_aux): New types to store auxiliary information
        for gi_filename.
	* libgcc/libgcov-driver-system.c (gcov_error): New utility function.
	(allocate_filename_struct): New function split from gcov_exit().
	(gcov_exit_open_gcda_file): Ditto.
	(create_file_directory): Moved from libgcov.c
	* libgcc/Makefile.in: Change to build newly added files.

From-SVN: r204730
This commit is contained in:
Rong Xu 2013-11-13 00:24:49 +00:00
parent ef61907f9c
commit d6d3f03341
8 changed files with 1782 additions and 1421 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
gcc/gcov-io.h
View file

@ -519,6 +519,8 @@ extern void __gcov_merge_time_profile (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned);
extern void __gcov_pow2_profiler (gcov_type *, gcov_type);
extern void __gcov_one_value_profiler (gcov_type *, gcov_type);
extern void __gcov_indirect_call_profiler (gcov_type*, gcov_type,
void*, void*);
extern void __gcov_indirect_call_profiler_v2 (gcov_type, void *);
extern void __gcov_average_profiler (gcov_type *, gcov_type);
extern void __gcov_ior_profiler (gcov_type *, gcov_type);

31
libgcc/Makefile.in
View file

@ -852,18 +852,31 @@ include $(iterator)
# Build libgcov components.
# Defined in libgcov.c, included only in gcov library
LIBGCOV = _gcov _gcov_merge_add _gcov_merge_single _gcov_merge_delta \
_gcov_fork _gcov_execl _gcov_execlp _gcov_execle \
_gcov_execv _gcov_execvp _gcov_execve _gcov_reset _gcov_dump \
_gcov_interval_profiler _gcov_pow2_profiler _gcov_one_value_profiler \
LIBGCOV_MERGE = _gcov_merge_add _gcov_merge_single _gcov_merge_delta _gcov_merge_ior \
_gcov_merge_time_profile
LIBGCOV_PROFILER = _gcov_interval_profiler _gcov_pow2_profiler _gcov_one_value_profiler \
_gcov_indirect_call_profiler _gcov_average_profiler _gcov_ior_profiler \
_gcov_merge_ior _gcov_time_profiler _gcov_indirect_call_profiler_v2 _gcov_merge_time_profile
_gcov_indirect_call_profiler_v2 _gcov_time_profiler
LIBGCOV_INTERFACE = _gcov_flush _gcov_fork _gcov_execl _gcov_execlp _gcov_execle \
_gcov_execv _gcov_execvp _gcov_execve _gcov_reset _gcov_dump
LIBGCOV_DRIVER = _gcov
libgcov-objects = $(patsubst %,%$(objext),$(LIBGCOV))
libgcov-merge-objects = $(patsubst %,%$(objext),$(LIBGCOV_MERGE))
libgcov-profiler-objects = $(patsubst %,%$(objext),$(LIBGCOV_PROFILER))
libgcov-interface-objects = $(patsubst %,%$(objext),$(LIBGCOV_INTERFACE))
libgcov-driver-objects = $(patsubst %,%$(objext),$(LIBGCOV_DRIVER))
libgcov-objects = $(libgcov-merge-objects) $(libgcov-profiler-objects) \
$(libgcov-interface-objects) $(libgcov-driver-objects)
$(libgcov-objects): %$(objext): $(srcdir)/libgcov.c
$(gcc_compile) -DL$* -c $(srcdir)/libgcov.c
$(libgcov-merge-objects): %$(objext): $(srcdir)/libgcov-merge.c
$(gcc_compile) -DL$* -c $(srcdir)/libgcov-merge.c
$(libgcov-profiler-objects): %$(objext): $(srcdir)/libgcov-profiler.c
$(gcc_compile) -DL$* -c $(srcdir)/libgcov-profiler.c
$(libgcov-interface-objects): %$(objext): $(srcdir)/libgcov-interface.c
$(gcc_compile) -DL$* -c $(srcdir)/libgcov-interface.c
$(libgcov-driver-objects): %$(objext): $(srcdir)/libgcov-driver.c \
$(srcdir)/libgcov-driver-system.c
$(gcc_compile) -DL$* -c $(srcdir)/libgcov-driver.c
# Static libraries.

203
libgcc/libgcov-driver-system.c Normal file
View file

@ -0,0 +1,203 @@
/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2013 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* A utility function for outputing errors. */
static int __attribute__((format(printf, 1, 2)))
gcov_error (const char *fmt, ...)
{
int ret;
va_list argp;
va_start (argp, fmt);
ret = vfprintf (stderr, fmt, argp);
va_end (argp);
return ret;
}
/* Make sure path component of the given FILENAME exists, create
missing directories. FILENAME must be writable.
Returns zero on success, or -1 if an error occurred. */
static int
create_file_directory (char *filename)
{
#if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
(void) filename;
return -1;
#else
char *s;
s = filename;
if (HAS_DRIVE_SPEC(s))
s += 2;
if (IS_DIR_SEPARATOR(*s))
++s;
for (; *s != '\0'; s++)
if (IS_DIR_SEPARATOR(*s))
{
char sep = *s;
*s = '\0';
/* Try to make directory if it doesn't already exist. */
if (access (filename, F_OK) == -1
#ifdef TARGET_POSIX_IO
&& mkdir (filename, 0755) == -1
#else
&& mkdir (filename) == -1
#endif
/* The directory might have been made by another process. */
&& errno != EEXIST)
{
gcov_error ("profiling:%s:Cannot create directory\n", filename);
*s = sep;
return -1;
};
*s = sep;
};
return 0;
#endif
}
static void
allocate_filename_struct (struct gcov_filename_aux *gf)
{
const char *gcov_prefix;
int gcov_prefix_strip = 0;
size_t prefix_length;
char *gi_filename_up;
gcc_assert (gf);
{
/* Check if the level of dirs to strip off specified. */
char *tmp = getenv("GCOV_PREFIX_STRIP");
if (tmp)
{
gcov_prefix_strip = atoi (tmp);
/* Do not consider negative values. */
if (gcov_prefix_strip < 0)
gcov_prefix_strip = 0;
}
}
/* Get file name relocation prefix. Non-absolute values are ignored. */
gcov_prefix = getenv("GCOV_PREFIX");
if (gcov_prefix)
{
prefix_length = strlen(gcov_prefix);
/* Remove an unnecessary trailing '/' */
if (IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))
prefix_length--;
}
else
prefix_length = 0;
/* If no prefix was specified and a prefix stip, then we assume
relative. */
if (gcov_prefix_strip != 0 && prefix_length == 0)
{
gcov_prefix = ".";
prefix_length = 1;
}
/* Allocate and initialize the filename scratch space plus one. */
gi_filename = (char *) malloc (prefix_length + gcov_max_filename + 2);
if (prefix_length)
memcpy (gi_filename, gcov_prefix, prefix_length);
gi_filename_up = gi_filename + prefix_length;
gf->gi_filename_up = gi_filename_up;
gf->prefix_length = prefix_length;
gf->gcov_prefix_strip = gcov_prefix_strip;
}
/* Open a gcda file specified by GI_FILENAME.
Return -1 on error. Return 0 on success. */
static int
gcov_exit_open_gcda_file (struct gcov_info *gi_ptr, struct gcov_filename_aux *gf)
{
int gcov_prefix_strip;
size_t prefix_length;
char *gi_filename_up;
const char *fname, *s;
gcov_prefix_strip = gf->gcov_prefix_strip;
gi_filename_up = gf->gi_filename_up;
prefix_length = gf->prefix_length;
fname = gi_ptr->filename;
/* 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);
return -1;
}
if (!gcov_open (gi_filename))
{
fprintf (stderr, "profiling:%s:Cannot open\n", gi_filename);
return -1;
}
}
return 0;
}

872
libgcc/libgcov-driver.c Normal file
View file

@ -0,0 +1,872 @@
/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2013 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "tconfig.h"
#include "tsystem.h"
#include "coretypes.h"
#include "tm.h"
#include "libgcc_tm.h"
#if defined(inhibit_libc)
#define IN_LIBGCOV (-1)
#else
#define IN_LIBGCOV 1
#if defined(L_gcov)
#define GCOV_LINKAGE /* nothing */
#endif
#endif
#include "gcov-io.h"
#if defined(inhibit_libc)
/* If libc and its header files are not available, provide dummy functions. */
#if defined(L_gcov)
void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {}
#endif
#else /* inhibit_libc */
#include <string.h>
#if GCOV_LOCKED
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#endif
#ifdef L_gcov
#include "gcov-io.c"
/* The following functions can be called from outside of this file. */
extern void gcov_clear (void) ATTRIBUTE_HIDDEN;
extern void gcov_exit (void) ATTRIBUTE_HIDDEN;
extern void set_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
extern void reset_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
extern int get_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
extern void set_gcov_list (struct gcov_info *) ATTRIBUTE_HIDDEN;
struct gcov_fn_buffer
{
struct gcov_fn_buffer *next;
unsigned fn_ix;
struct gcov_fn_info info;
/* note gcov_fn_info ends in a trailing array. */
};
struct gcov_summary_buffer
{
struct gcov_summary_buffer *next;
struct gcov_summary summary;
};
/* Chain of per-object gcov structures. */
static struct gcov_info *gcov_list;
/* Set the head of gcov_list. */
void
set_gcov_list (struct gcov_info *head)
{
gcov_list = head;
}
/* Size of the longest file name. */
static size_t gcov_max_filename = 0;
/* Flag when the profile has already been dumped via __gcov_dump(). */
static int gcov_dump_complete;
/* A global functino that get the vaule of gcov_dump_complete. */
int
get_gcov_dump_complete (void)
{
return gcov_dump_complete;
}
/* A global functino that set the vaule of gcov_dump_complete. Will
be used in __gcov_dump() in libgcov-interface.c. */
void
set_gcov_dump_complete (void)
{
gcov_dump_complete = 1;
}
/* A global functino that set the vaule of gcov_dump_complete. Will
be used in __gcov_reset() in libgcov-interface.c. */
void
reset_gcov_dump_complete (void)
{
gcov_dump_complete = 0;
}
/* A utility function for outputing errors. */
static int gcov_error (const char *, ...);
static struct gcov_fn_buffer *
free_fn_data (const struct gcov_info *gi_ptr, struct gcov_fn_buffer *buffer,
unsigned limit)
{
struct gcov_fn_buffer *next;
unsigned ix, n_ctr = 0;
if (!buffer)
return 0;
next = buffer->next;
for (ix = 0; ix != limit; ix++)
if (gi_ptr->merge[ix])
free (buffer->info.ctrs[n_ctr++].values);
free (buffer);
return next;
}
static struct gcov_fn_buffer **
buffer_fn_data (const char *filename, const struct gcov_info *gi_ptr,
struct gcov_fn_buffer **end_ptr, unsigned fn_ix)
{
unsigned n_ctrs = 0, ix = 0;
struct gcov_fn_buffer *fn_buffer;
unsigned len;
for (ix = GCOV_COUNTERS; ix--;)
if (gi_ptr->merge[ix])
n_ctrs++;
len = sizeof (*fn_buffer) + sizeof (fn_buffer->info.ctrs[0]) * n_ctrs;
fn_buffer = (struct gcov_fn_buffer *)malloc (len);
if (!fn_buffer)
goto fail;
fn_buffer->next = 0;
fn_buffer->fn_ix = fn_ix;
fn_buffer->info.ident = gcov_read_unsigned ();
fn_buffer->info.lineno_checksum = gcov_read_unsigned ();
fn_buffer->info.cfg_checksum = gcov_read_unsigned ();
for (n_ctrs = ix = 0; ix != GCOV_COUNTERS; ix++)
{
gcov_unsigned_t length;
gcov_type *values;
if (!gi_ptr->merge[ix])
continue;
if (gcov_read_unsigned () != GCOV_TAG_FOR_COUNTER (ix))
{
len = 0;
goto fail;
}
length = GCOV_TAG_COUNTER_NUM (gcov_read_unsigned ());
len = length * sizeof (gcov_type);
values = (gcov_type *)malloc (len);
if (!values)
goto fail;
fn_buffer->info.ctrs[n_ctrs].num = length;
fn_buffer->info.ctrs[n_ctrs].values = values;
while (length--)
*values++ = gcov_read_counter ();
n_ctrs++;
}
*end_ptr = fn_buffer;
return &fn_buffer->next;
fail:
gcov_error ("profiling:%s:Function %u %s %u \n", filename, fn_ix,
len ? "cannot allocate" : "counter mismatch", len ? len : ix);
return (struct gcov_fn_buffer **)free_fn_data (gi_ptr, fn_buffer, ix);
}
/* Add an unsigned value to the current crc */
static gcov_unsigned_t
crc32_unsigned (gcov_unsigned_t crc32, gcov_unsigned_t value)
{
unsigned ix;
for (ix = 32; ix--; value <<= 1)
{
unsigned feedback;
feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0;
crc32 <<= 1;
crc32 ^= feedback;
}
return crc32;
}
/* Check if VERSION of the info block PTR matches libgcov one.
Return 1 on success, or zero in case of versions mismatch.
If FILENAME is not NULL, its value used for reporting purposes
instead of value from the info block. */
static int
gcov_version (struct gcov_info *ptr, gcov_unsigned_t version,
const char *filename)
{
if (version != GCOV_VERSION)
{
char v[4], e[4];
GCOV_UNSIGNED2STRING (v, version);
GCOV_UNSIGNED2STRING (e, GCOV_VERSION);
gcov_error ("profiling:%s:Version mismatch - expected %.4s got %.4s\n",
filename? filename : ptr->filename, e, v);
return 0;
}
return 1;
}
/* Insert counter VALUE into HISTOGRAM. */
static void
gcov_histogram_insert(gcov_bucket_type *histogram, gcov_type value)
{
unsigned i;
i = gcov_histo_index(value);
histogram[i].num_counters++;
histogram[i].cum_value += value;
if (value < histogram[i].min_value)
histogram[i].min_value = value;
}
/* Computes a histogram of the arc counters to place in the summary SUM. */
static void
gcov_compute_histogram (struct gcov_summary *sum)
{
struct gcov_info *gi_ptr;
const struct gcov_fn_info *gfi_ptr;
const struct gcov_ctr_info *ci_ptr;
struct gcov_ctr_summary *cs_ptr;
unsigned t_ix, f_ix, ctr_info_ix, ix;
int h_ix;
/* This currently only applies to arc counters. */
t_ix = GCOV_COUNTER_ARCS;
/* First check if there are any counts recorded for this counter. */
cs_ptr = &(sum->ctrs[t_ix]);
if (!cs_ptr->num)
return;
for (h_ix = 0; h_ix < GCOV_HISTOGRAM_SIZE; h_ix++)
{
cs_ptr->histogram[h_ix].num_counters = 0;
cs_ptr->histogram[h_ix].min_value = cs_ptr->run_max;
cs_ptr->histogram[h_ix].cum_value = 0;
}
/* Walk through all the per-object structures and record each of
the count values in histogram. */
for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
{
if (!gi_ptr->merge[t_ix])
continue;
/* Find the appropriate index into the gcov_ctr_info array
for the counter we are currently working on based on the
existence of the merge function pointer for this object. */
for (ix = 0, ctr_info_ix = 0; ix < t_ix; ix++)
{
if (gi_ptr->merge[ix])
ctr_info_ix++;
}
for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++)
{
gfi_ptr = gi_ptr->functions[f_ix];
if (!gfi_ptr || gfi_ptr->key != gi_ptr)
continue;
ci_ptr = &gfi_ptr->ctrs[ctr_info_ix];
for (ix = 0; ix < ci_ptr->num; ix++)
gcov_histogram_insert (cs_ptr->histogram, ci_ptr->values[ix]);
}
}
}
/* summary for program. */
static struct gcov_summary this_prg;
#if !GCOV_LOCKED
/* summary for all instances of program. */
static struct gcov_summary all_prg;
#endif
/* crc32 for this program. */
static gcov_unsigned_t crc32;
/* gcda filename. */
static char *gi_filename;
/* buffer for the fn_data from another program. */
static struct gcov_fn_buffer *fn_buffer;
/* buffer for summary from other programs to be written out. */
static struct gcov_summary_buffer *sum_buffer;
/* This funtions computes the program level summary and the histo-gram.
It initializes ALL_PRG, computes CRC32, and stores the summary in
THIS_PRG. All these three variables are file statics. */
static void
gcov_exit_compute_summary (void)
{
struct gcov_info *gi_ptr;
const struct gcov_fn_info *gfi_ptr;
struct gcov_ctr_summary *cs_ptr;
const struct gcov_ctr_info *ci_ptr;
int f_ix;
unsigned t_ix;
gcov_unsigned_t c_num;
#if !GCOV_LOCKED
memset (&all_prg, 0, sizeof (all_prg));
#endif
/* Find the totals for this execution. */
memset (&this_prg, 0, sizeof (this_prg));
for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
{
crc32 = crc32_unsigned (crc32, gi_ptr->stamp);
crc32 = crc32_unsigned (crc32, gi_ptr->n_functions);
for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++)
{
gfi_ptr = gi_ptr->functions[f_ix];
if (gfi_ptr && gfi_ptr->key != gi_ptr)
gfi_ptr = 0;
crc32 = crc32_unsigned (crc32, gfi_ptr ? gfi_ptr->cfg_checksum : 0);
crc32 = crc32_unsigned (crc32,
gfi_ptr ? gfi_ptr->lineno_checksum : 0);
if (!gfi_ptr)
continue;
ci_ptr = gfi_ptr->ctrs;
for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++)
{
if (!gi_ptr->merge[t_ix])
continue;
cs_ptr = &this_prg.ctrs[t_ix];
cs_ptr->num += ci_ptr->num;
crc32 = crc32_unsigned (crc32, ci_ptr->num);
for (c_num = 0; c_num < ci_ptr->num; c_num++)
{
cs_ptr->sum_all += ci_ptr->values[c_num];
if (cs_ptr->run_max < ci_ptr->values[c_num])
cs_ptr->run_max = ci_ptr->values[c_num];
}
ci_ptr++;
}
}
}
gcov_compute_histogram (&this_prg);
}
/* A struct that bundles all the related information about the
gcda filename. */
struct gcov_filename_aux{
char *gi_filename_up;
int gcov_prefix_strip;
size_t prefix_length;
};
/* Including system dependent components. */
#include "libgcov-driver-system.c"
/* This function merges counters in GI_PTR to an existing gcda file.
Return 0 on success.
Return -1 on error. In this case, caller will goto read_fatal. */
static int
gcov_exit_merge_gcda (struct gcov_info *gi_ptr,
struct gcov_summary *prg_p,
gcov_position_t *summary_pos_p,
gcov_position_t *eof_pos_p)
{
gcov_unsigned_t tag, length;
unsigned t_ix;
int f_ix;
int error = 0;
struct gcov_fn_buffer **fn_tail = &fn_buffer;
struct gcov_summary_buffer **sum_tail = &sum_buffer;
length = gcov_read_unsigned ();
if (!gcov_version (gi_ptr, length, gi_filename))
return -1;
length = gcov_read_unsigned ();
if (length != gi_ptr->stamp)
/* Read from a different compilation. Overwrite the file. */
return 0;
/* Look for program summary. */
for (f_ix = 0;;)
{
struct gcov_summary tmp;
*eof_pos_p = gcov_position ();
tag = gcov_read_unsigned ();
if (tag != GCOV_TAG_PROGRAM_SUMMARY)
break;
f_ix--;
length = gcov_read_unsigned ();
gcov_read_summary (&tmp);
if ((error = gcov_is_error ()))
goto read_error;
if (*summary_pos_p)
{
/* Save all summaries after the one that will be
merged into below. These will need to be rewritten
as histogram merging may change the number of non-zero
histogram entries that will be emitted, and thus the
size of the merged summary. */
(*sum_tail) = (struct gcov_summary_buffer *)
malloc (sizeof(struct gcov_summary_buffer));
(*sum_tail)->summary = tmp;
(*sum_tail)->next = 0;
sum_tail = &((*sum_tail)->next);
goto next_summary;
}
if (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_p = tmp;
*summary_pos_p = *eof_pos_p;
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 ())
{
const struct gcov_ctr_info *ci_ptr;
const struct gcov_fn_info *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:;
gcov_error ("profiling:%s:Merge mismatch for %s %u\n",
gi_filename, f_ix >= 0 ? "function" : "summary",
f_ix < 0 ? -1 - f_ix : f_ix);
return -1;
}
return 0;
read_error:
gcov_error ("profiling:%s:%s merging\n", gi_filename,
error < 0 ? "Overflow": "Error");
return -1;
}
/* Write counters in GI_PTR and the summary in PRG to a gcda file. In
the case of appending to an existing file, SUMMARY_POS will be non-zero.
We will write the file starting from SUMMAY_POS. */
static void
gcov_exit_write_gcda (const struct gcov_info *gi_ptr,
const struct gcov_summary *prg_p,
const gcov_position_t eof_pos,
const gcov_position_t summary_pos)
{
unsigned f_ix;
struct gcov_summary_buffer *next_sum_buffer;
/* 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_p);
/* Rewrite all the summaries that were after the summary we merged
into. This is necessary as the merged summary may have a different
size due to the number of non-zero histogram entries changing after
merging. */
while (sum_buffer)
{
gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &sum_buffer->summary);
next_sum_buffer = sum_buffer->next;
free (sum_buffer);
sum_buffer = next_sum_buffer;
}
/* Write execution counts for each function. */
for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++)
{
unsigned buffered = 0;
const struct gcov_fn_info *gfi_ptr;
const struct gcov_ctr_info *ci_ptr;
gcov_unsigned_t length;
unsigned t_ix;
if (fn_buffer && fn_buffer->fn_ix == 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++)
{
gcov_unsigned_t n_counts;
gcov_type *c_ptr;
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));
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);
}
/* Helper function for merging summary.
Return -1 on error. Return 0 on success. */
static int
gcov_exit_merge_summary (const struct gcov_info *gi_ptr, struct gcov_summary *prg)
{
struct gcov_ctr_summary *cs_prg, *cs_tprg;
#if !GCOV_LOCKED
struct gcov_ctr_summary *cs_all;
#endif
unsigned t_ix;
/* 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];
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;
if (cs_prg->runs == 1)
memcpy (cs_prg->histogram, cs_tprg->histogram,
sizeof (gcov_bucket_type) * GCOV_HISTOGRAM_SIZE);
else
gcov_histogram_merge (cs_prg->histogram, cs_tprg->histogram);
}
else if (cs_prg->runs)
{
gcov_error ("profiling:%s:Merge mismatch for summary.\n",
gi_filename);
return -1;
}
#if !GCOV_LOCKED
cs_all = &all_prg.ctrs[t_ix];
if (!cs_all->runs && cs_prg->runs)
{
cs_all->num = cs_prg->num;
cs_all->runs = cs_prg->runs;
cs_all->sum_all = cs_prg->sum_all;
cs_all->run_max = cs_prg->run_max;
cs_all->sum_max = cs_prg->sum_max;
}
else if (!all_prg.checksum
/* Don't compare the histograms, which may have slight
variations depending on the order they were updated
due to the truncating integer divides used in the
merge. */
&& (cs_all->num != cs_prg->num
|| cs_all->runs != cs_prg->runs
|| cs_all->sum_all != cs_prg->sum_all
|| cs_all->run_max != cs_prg->run_max
|| cs_all->sum_max != cs_prg->sum_max))
{
gcov_error ("profiling:%s:Data file mismatch - some "
"data files may have been concurrently "
"updated without locking support\n", gi_filename);
all_prg.checksum = ~0u;
}
#endif
}
prg->checksum = crc32;
return 0;
}
/* Dump the coverage counts for one gcov_info object. We merge with existing
counts when possible, to avoid growing the .da files ad infinitum. We use
this program's checksum to make sure we only accumulate whole program
statistics to the correct summary. An object file might be embedded
in two separate programs, and we must keep the two program
summaries separate. */
static void
gcov_exit_dump_gcov (struct gcov_info *gi_ptr, struct gcov_filename_aux *gf)
{
struct gcov_summary prg; /* summary for this object over all program. */
int error;
gcov_unsigned_t tag;
gcov_position_t summary_pos = 0;
gcov_position_t eof_pos = 0;
fn_buffer = 0;
sum_buffer = 0;
error = gcov_exit_open_gcda_file (gi_ptr, gf);
if (error == -1)
return;
tag = gcov_read_unsigned ();
if (tag)
{
/* Merge data from file. */
if (tag != GCOV_DATA_MAGIC)
{
gcov_error ("profiling:%s:Not a gcov data file\n", gi_filename);
goto read_fatal;
}
error = gcov_exit_merge_gcda (gi_ptr, &prg, &summary_pos, &eof_pos);
if (error == -1)
goto read_fatal;
}
gcov_rewrite ();
if (!summary_pos)
{
memset (&prg, 0, sizeof (prg));
summary_pos = eof_pos;
}
error = gcov_exit_merge_summary (gi_ptr, &prg);
if (error == -1)
goto read_fatal;
gcov_exit_write_gcda (gi_ptr, &prg, eof_pos, summary_pos);
/* fall through */
read_fatal:;
while (fn_buffer)
fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
if ((error = gcov_close ()))
gcov_error (error < 0 ?
"profiling:%s:Overflow writing\n" :
"profiling:%s:Error writing\n",
gi_filename);
}
/* Dump all the coverage counts for the program. It first computes program
summary and then traverses gcov_list list and dumps the gcov_info
objects one by one. */
void
gcov_exit (void)
{
struct gcov_info *gi_ptr;
struct gcov_filename_aux gf;
/* Prevent the counters from being dumped a second time on exit when the
application already wrote out the profile using __gcov_dump(). */
if (gcov_dump_complete)
return;
gcov_exit_compute_summary ();
allocate_filename_struct (&gf);
/* Now merge each file. */
for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
gcov_exit_dump_gcov (gi_ptr, &gf);
if (gi_filename)
free (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;
}
#endif /* L_gcov */
#endif /* inhibit_libc */

279
libgcc/libgcov-interface.c Normal file
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@ -0,0 +1,279 @@
/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2013 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "tconfig.h"
#include "tsystem.h"
#include "coretypes.h"
#include "tm.h"
#include "libgcc_tm.h"
#include "gthr.h"
#if defined(inhibit_libc)
#define IN_LIBGCOV (-1)
#else
#define IN_LIBGCOV 1
#endif
#include "gcov-io.h"
#if defined(inhibit_libc)
#ifdef L_gcov_flush
void __gcov_flush (void) {}
#endif
#ifdef L_gcov_reset
void __gcov_reset (void) {}
#endif
#ifdef L_gcov_dump
void __gcov_dump (void) {}
#endif
#else
extern void gcov_clear (void) ATTRIBUTE_HIDDEN;
extern void gcov_exit (void) ATTRIBUTE_HIDDEN;
extern void set_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
extern void reset_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
#ifdef L_gcov_flush
#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_flush */
#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. */
reset_gcov_dump_complete ();
}
#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. */
set_gcov_dump_complete ();
}
#endif /* L_gcov_dump */
#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 */

181
libgcc/libgcov-merge.c Normal file
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/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2013 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "tconfig.h"
#include "tsystem.h"
#include "coretypes.h"
#include "tm.h"
#include "libgcc_tm.h"
#if defined(inhibit_libc)
#define IN_LIBGCOV (-1)
#else
#define IN_LIBGCOV 1
#endif
#include "gcov-io.h"
#if defined(inhibit_libc)
/* If libc and its header files are not available, provide dummy functions. */
#ifdef L_gcov_merge_add
void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused))) {}
#endif
#ifdef L_gcov_merge_single
void __gcov_merge_single (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused))) {}
#endif
#ifdef L_gcov_merge_delta
void __gcov_merge_delta (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused))) {}
#endif
#else
#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_time_profile
/* Time profiles are merged so that minimum from all valid (greater than zero)
is stored. There could be a fork that creates new counters. To have
the profile stable, we chosen to pick the smallest function visit time. */
void
__gcov_merge_time_profile (gcov_type *counters, unsigned n_counters)
{
unsigned int i;
gcov_type value;
for (i = 0; i < n_counters; i++)
{
value = gcov_read_counter ();
if (value && (!counters[i] || value < counters[i]))
counters[i] = value;
}
}
#endif /* L_gcov_merge_time_profile */
#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 */
#endif /* inhibit_libc */

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/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2013 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "tconfig.h"
#include "tsystem.h"
#include "coretypes.h"
#include "tm.h"
#include "libgcc_tm.h"
#if !defined(inhibit_libc)
#define IN_LIBGCOV 1
#include "gcov-io.h"
#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
/* This function exist only for workaround of binutils bug 14342.
Once this compatibility hack is obsolette, it can be removed. */
/* 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_indirect_call_profiler_v2
/* These two variables are used to actually track caller and callee. Keep
them in TLS memory so races are not common (they are written to often).
The variables are set directly by GCC instrumented code, so declaration
here must match one in tree-profile.c */
#if defined(HAVE_CC_TLS) && !defined (USE_EMUTLS)
__thread
#endif
void * __gcov_indirect_call_callee;
#if defined(HAVE_CC_TLS) && !defined (USE_EMUTLS)
__thread
#endif
gcov_type * __gcov_indirect_call_counters;
/* 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_v2 (gcov_type value, void* cur_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 == __gcov_indirect_call_callee
|| (VTABLE_USES_DESCRIPTORS && __gcov_indirect_call_callee
&& *(void **) cur_func == *(void **) __gcov_indirect_call_callee))
__gcov_one_value_profiler_body (__gcov_indirect_call_counters, value);
}
#endif
#ifdef L_gcov_time_profiler
/* Counter for first visit of each function. */
static gcov_type function_counter;
/* Sets corresponding COUNTERS if there is no value. */
void
__gcov_time_profiler (gcov_type* counters)
{
if (!counters[0])
counters[0] = ++function_counter;
}
#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
/* Bitwise-OR VALUE into COUNTER. */
void
__gcov_ior_profiler (gcov_type *counters, gcov_type value)
{
*counters |= value;
}
#endif
#endif /* inhibit_libc */

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