git
/
gcc
mirror of git://gcc.gnu.org/git/gcc.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
gcc/libgcc/libgcov-util.c

860 lines
23 KiB
C
Raw Blame History

/* Utility functions for reading gcda files into in-memory
gcov_info structures and offline profile processing. */
/* Copyright (C) 2014 Free Software Foundation, Inc.
Contributed by Rong Xu <xur@google.com>.
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/>. */
#define IN_GCOV_TOOL 1
#include "libgcov.h"
#include "intl.h"
#include "diagnostic.h"
#include "version.h"
#include "demangle.h"
/* Borrowed from basic-block.h. */
#define RDIV(X,Y) (((X) + (Y) / 2) / (Y))
extern gcov_position_t gcov_position();
extern int gcov_is_error();
/* Verbose mode for debug. */
static int verbose;
/* Set verbose flag. */
void gcov_set_verbose (void)
{
verbose = 1;
}
/* The following part is to read Gcda and reconstruct GCOV_INFO. */
#include "obstack.h"
#include <unistd.h>
#include <ftw.h>
static void tag_function (unsigned, unsigned);
static void tag_blocks (unsigned, unsigned);
static void tag_arcs (unsigned, unsigned);
static void tag_lines (unsigned, unsigned);
static void tag_counters (unsigned, unsigned);
static void tag_summary (unsigned, unsigned);
/* The gcov_info for the first module. */
static struct gcov_info *curr_gcov_info;
/* The gcov_info being processed. */
static struct gcov_info *gcov_info_head;
/* This variable contains all the functions in current module. */
static struct obstack fn_info;
/* The function being processed. */
static struct gcov_fn_info *curr_fn_info;
/* The number of functions seen so far. */
static unsigned num_fn_info;
/* This variable contains all the counters for current module. */
static int k_ctrs_mask[GCOV_COUNTERS];
/* The kind of counters that have been seen. */
static struct gcov_ctr_info k_ctrs[GCOV_COUNTERS];
/* Number of kind of counters that have been seen. */
static int k_ctrs_types;
/* Merge functions for counters. */
#define DEF_GCOV_COUNTER(COUNTER, NAME, FN_TYPE) __gcov_merge ## FN_TYPE,
static gcov_merge_fn ctr_merge_functions[GCOV_COUNTERS] = {
#include "gcov-counter.def"
};
#undef DEF_GCOV_COUNTER
/* Set the ctrs field in gcov_fn_info object FN_INFO. */
static void
set_fn_ctrs (struct gcov_fn_info *fn_info)
{
int j = 0, i;
for (i = 0; i < GCOV_COUNTERS; i++)
{
if (k_ctrs_mask[i] == 0)
continue;
fn_info->ctrs[j].num = k_ctrs[i].num;
fn_info->ctrs[j].values = k_ctrs[i].values;
j++;
}
if (k_ctrs_types == 0)
k_ctrs_types = j;
else
gcc_assert (j == k_ctrs_types);
}
/* For each tag in gcda file, we have an entry here.
TAG is the tag value; NAME is the tag name; and
PROC is the handler function. */
typedef struct tag_format
{
unsigned tag;
char const *name;
void (*proc) (unsigned, unsigned);
} tag_format_t;
/* Handler table for various Tags. */
static const tag_format_t tag_table[] =
{
{0, "NOP", NULL},
{0, "UNKNOWN", NULL},
{0, "COUNTERS", tag_counters},
{GCOV_TAG_FUNCTION, "FUNCTION", tag_function},
{GCOV_TAG_BLOCKS, "BLOCKS", tag_blocks},
{GCOV_TAG_ARCS, "ARCS", tag_arcs},
{GCOV_TAG_LINES, "LINES", tag_lines},
{GCOV_TAG_OBJECT_SUMMARY, "OBJECT_SUMMARY", tag_summary},
{GCOV_TAG_PROGRAM_SUMMARY, "PROGRAM_SUMMARY", tag_summary},
{0, NULL, NULL}
};
/* Handler for reading function tag. */
static void
tag_function (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
int i;
/* write out previous fn_info. */
if (num_fn_info)
{
set_fn_ctrs (curr_fn_info);
obstack_ptr_grow (&fn_info, curr_fn_info);
}
/* Here we over allocate a bit, using GCOV_COUNTERS instead of the actual active
counter types. */
curr_fn_info = (struct gcov_fn_info *) xcalloc (sizeof (struct gcov_fn_info)
+ GCOV_COUNTERS * sizeof (struct gcov_ctr_info), 1);
for (i = 0; i < GCOV_COUNTERS; i++)
k_ctrs[i].num = 0;
k_ctrs_types = 0;
curr_fn_info->key = curr_gcov_info;
curr_fn_info->ident = gcov_read_unsigned ();
curr_fn_info->lineno_checksum = gcov_read_unsigned ();
curr_fn_info->cfg_checksum = gcov_read_unsigned ();
num_fn_info++;
if (verbose)
fnotice (stdout, "tag one function id=%d\n", curr_fn_info->ident);
}
/* Handler for reading block tag. */
static void
tag_blocks (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
/* TBD: gcov-tool currently does not handle gcno files. Assert here. */
gcc_unreachable ();
}
/* Handler for reading flow arc tag. */
static void
tag_arcs (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
/* TBD: gcov-tool currently does not handle gcno files. Assert here. */
gcc_unreachable ();
}
/* Handler for reading line tag. */
static void
tag_lines (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
/* TBD: gcov-tool currently does not handle gcno files. Assert here. */
gcc_unreachable ();
}
/* Handler for reading counters array tag with value as TAG and length of LENGTH. */
static void
tag_counters (unsigned tag, unsigned length)
{
unsigned n_counts = GCOV_TAG_COUNTER_NUM (length);
gcov_type *values;
unsigned ix;
unsigned tag_ix;
tag_ix = GCOV_COUNTER_FOR_TAG (tag);
gcc_assert (tag_ix < GCOV_COUNTERS);
k_ctrs_mask [tag_ix] = 1;
gcc_assert (k_ctrs[tag_ix].num == 0);
k_ctrs[tag_ix].num = n_counts;
k_ctrs[tag_ix].values = values = (gcov_type *) xmalloc (n_counts * sizeof (gcov_type));
gcc_assert (values);
for (ix = 0; ix != n_counts; ix++)
values[ix] = gcov_read_counter ();
}
/* Handler for reading summary tag. */
static void
tag_summary (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
struct gcov_summary summary;
gcov_read_summary (&summary);
}
/* This function is called at the end of reading a gcda file.
It flushes the contents in curr_fn_info to gcov_info object OBJ_INFO. */
static void
read_gcda_finalize (struct gcov_info *obj_info)
{
int i;
set_fn_ctrs (curr_fn_info);
obstack_ptr_grow (&fn_info, curr_fn_info);
/* We set the following fields: merge, n_functions, and functions. */
obj_info->n_functions = num_fn_info;
obj_info->functions = (const struct gcov_fn_info**) obstack_finish (&fn_info);
/* wrap all the counter array. */
for (i=0; i< GCOV_COUNTERS; i++)
{
if (k_ctrs_mask[i])
obj_info->merge[i] = ctr_merge_functions[i];
}
}
/* Read the content of a gcda file FILENAME, and return a gcov_info data structure.
Program level summary CURRENT_SUMMARY will also be updated. */
static struct gcov_info *
read_gcda_file (const char *filename)
{
unsigned tags[4];
unsigned depth = 0;
unsigned magic, version;
struct gcov_info *obj_info;
int i;
for (i=0; i< GCOV_COUNTERS; i++)
k_ctrs_mask[i] = 0;
k_ctrs_types = 0;
if (!gcov_open (filename))
{
fnotice (stderr, "%s:cannot open\n", filename);
return NULL;
}
/* Read magic. */
magic = gcov_read_unsigned ();
if (magic != GCOV_DATA_MAGIC)
{
fnotice (stderr, "%s:not a gcov data file\n", filename);
gcov_close ();
return NULL;
}
/* Read version. */
version = gcov_read_unsigned ();
if (version != GCOV_VERSION)
{
fnotice (stderr, "%s:incorrect gcov version %d vs %d \n", filename, version, GCOV_VERSION);
gcov_close ();
return NULL;
}
/* Instantiate a gcov_info object. */
curr_gcov_info = obj_info = (struct gcov_info *) xcalloc (sizeof (struct gcov_info) +
sizeof (struct gcov_ctr_info) * GCOV_COUNTERS, 1);
obj_info->version = version;
obstack_init (&fn_info);
num_fn_info = 0;
curr_fn_info = 0;
{
size_t len = strlen (filename) + 1;
char *str_dup = (char*) xmalloc (len);
memcpy (str_dup, filename, len);
obj_info->filename = str_dup;
}
/* Read stamp. */
obj_info->stamp = gcov_read_unsigned ();
while (1)
{
gcov_position_t base;
unsigned tag, length;
tag_format_t const *format;
unsigned tag_depth;
int error;
unsigned mask;
tag = gcov_read_unsigned ();
if (!tag)
break;
length = gcov_read_unsigned ();
base = gcov_position ();
mask = GCOV_TAG_MASK (tag) >> 1;
for (tag_depth = 4; mask; mask >>= 8)
{
if (((mask & 0xff) != 0xff))
{
warning (0, "%s:tag `%x' is invalid\n", filename, tag);
break;
}
tag_depth--;
}
for (format = tag_table; format->name; format++)
if (format->tag == tag)
goto found;
format = &tag_table[GCOV_TAG_IS_COUNTER (tag) ? 2 : 1];
found:;
if (tag)
{
if (depth && depth < tag_depth)
{
if (!GCOV_TAG_IS_SUBTAG (tags[depth - 1], tag))
warning (0, "%s:tag `%x' is incorrectly nested\n",
filename, tag);
}
depth = tag_depth;
tags[depth - 1] = tag;
}
if (format->proc)
{
unsigned long actual_length;
(*format->proc) (tag, length);
actual_length = gcov_position () - base;
if (actual_length > length)
warning (0, "%s:record size mismatch %lu bytes overread\n",
filename, actual_length - length);
else if (length > actual_length)
warning (0, "%s:record size mismatch %lu bytes unread\n",
filename, length - actual_length);
}
gcov_sync (base, length);
if ((error = gcov_is_error ()))
{
warning (0, error < 0 ? "%s:counter overflow at %lu\n" :
"%s:read error at %lu\n", filename,
(long unsigned) gcov_position ());
break;
}
}
read_gcda_finalize (obj_info);
gcov_close ();
return obj_info;
}
/* This will be called by ftw(). It opens and read a gcda file FILENAME.
Return a non-zero value to stop the tree walk. */
static int
ftw_read_file (const char *filename,
const struct stat *status ATTRIBUTE_UNUSED,
int type)
{
int filename_len;
int suffix_len;
struct gcov_info *obj_info;
/* Only read regular files. */
if (type != FTW_F)
return 0;
filename_len = strlen (filename);
suffix_len = strlen (GCOV_DATA_SUFFIX);
if (filename_len <= suffix_len)
return 0;
if (strcmp(filename + filename_len - suffix_len, GCOV_DATA_SUFFIX))
return 0;
if (verbose)
fnotice (stderr, "reading file: %s\n", filename);
obj_info = read_gcda_file (filename);
if (!obj_info)
return 0;
obj_info->next = gcov_info_head;
gcov_info_head = obj_info;
return 0;
}
/* Initializer for reading a profile dir. */
static inline void
read_profile_dir_init (void)
{
gcov_info_head = 0;
}
/* Driver for read a profile directory and convert into gcov_info list in memory.
Return NULL on error,
Return the head of gcov_info list on success. */
struct gcov_info *
gcov_read_profile_dir (const char* dir_name, int recompute_summary ATTRIBUTE_UNUSED)
{
char *pwd;
int ret;
read_profile_dir_init ();
if (access (dir_name, R_OK) != 0)
{
fnotice (stderr, "cannot access directory %s\n", dir_name);
return NULL;
}
pwd = getcwd (NULL, 0);
gcc_assert (pwd);
ret = chdir (dir_name);
if (ret !=0)
{
fnotice (stderr, "%s is not a directory\n", dir_name);
return NULL;
}
ftw (".", ftw_read_file, 50);
ret = chdir (pwd);
free (pwd);
return gcov_info_head;;
}
/* This part of the code is to merge profile counters. These
variables are set in merge_wrapper and to be used by
global function gcov_read_counter_mem() and gcov_get_merge_weight. */
/* We save the counter value address to this variable. */
static gcov_type *gcov_value_buf;
/* The number of counter values to be read by current merging. */
static gcov_unsigned_t gcov_value_buf_size;
/* The index of counter values being read. */
static gcov_unsigned_t gcov_value_buf_pos;
/* The weight of current merging. */
static unsigned gcov_merge_weight;
/* Read a counter value from gcov_value_buf array. */
gcov_type
gcov_read_counter_mem (void)
{
gcov_type ret;
gcc_assert (gcov_value_buf_pos < gcov_value_buf_size);
ret = *(gcov_value_buf + gcov_value_buf_pos);
++gcov_value_buf_pos;
return ret;
}
/* Return the recorded merge weight. */
unsigned
gcov_get_merge_weight (void)
{
return gcov_merge_weight;
}
/* A wrapper function for merge functions. It sets up the
value buffer and weights and then calls the merge function. */
static void
merge_wrapper (gcov_merge_fn f, gcov_type *v1, gcov_unsigned_t n,
gcov_type *v2, unsigned w)
{
gcov_value_buf = v2;
gcov_value_buf_pos = 0;
gcov_value_buf_size = n;
gcov_merge_weight = w;
(*f) (v1, n);
}
/* Offline tool to manipulate profile data.
This tool targets on matched profiles. But it has some tolerance on
unmatched profiles.
When merging p1 to p2 (p2 is the dst),
* m.gcda in p1 but not in p2: append m.gcda to p2 with specified weight;
emit warning
* m.gcda in p2 but not in p1: keep m.gcda in p2 and multiply by
specified weight; emit warning.
* m.gcda in both p1 and p2:
** p1->m.gcda->f checksum matches p2->m.gcda->f: simple merge.
** p1->m.gcda->f checksum does not matches p2->m.gcda->f: keep
p2->m.gcda->f and
drop p1->m.gcda->f. A warning is emitted. */
/* Add INFO2's counter to INFO1, multiplying by weight W. */
static int
gcov_merge (struct gcov_info *info1, struct gcov_info *info2, int w)
{
unsigned f_ix;
unsigned n_functions = info1->n_functions;
int has_mismatch = 0;
gcc_assert (info2->n_functions == n_functions);
for (f_ix = 0; f_ix < n_functions; f_ix++)
{
unsigned t_ix;
const struct gcov_fn_info *gfi_ptr1 = info1->functions[f_ix];
const struct gcov_fn_info *gfi_ptr2 = info2->functions[f_ix];
const struct gcov_ctr_info *ci_ptr1, *ci_ptr2;
if (!gfi_ptr1 || gfi_ptr1->key != info1)
continue;
if (!gfi_ptr2 || gfi_ptr2->key != info2)
continue;
if (gfi_ptr1->cfg_checksum != gfi_ptr2->cfg_checksum)
{
fnotice (stderr, "in %s, cfg_checksum mismatch, skipping\n",
info1->filename);
has_mismatch = 1;
continue;
}
ci_ptr1 = gfi_ptr1->ctrs;
ci_ptr2 = gfi_ptr2->ctrs;
for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
{
gcov_merge_fn merge1 = info1->merge[t_ix];
gcov_merge_fn merge2 = info2->merge[t_ix];
gcc_assert (merge1 == merge2);
if (!merge1)
continue;
gcc_assert (ci_ptr1->num == ci_ptr2->num);
merge_wrapper (merge1, ci_ptr1->values, ci_ptr1->num, ci_ptr2->values, w);
ci_ptr1++;
ci_ptr2++;
}
}
return has_mismatch;
}
/* Find and return the match gcov_info object for INFO from ARRAY.
SIZE is the length of ARRAY.
Return NULL if there is no match. */
static struct gcov_info *
find_match_gcov_info (struct gcov_info **array, int size, struct gcov_info *info)
{
struct gcov_info *gi_ptr;
struct gcov_info *ret = NULL;
int i;
for (i = 0; i < size; i++)
{
gi_ptr = array[i];
if (gi_ptr == 0)
continue;
if (!strcmp (gi_ptr->filename, info->filename))
{
ret = gi_ptr;
array[i] = 0;
break;
}
}
if (ret && ret->n_functions != info->n_functions)
{
fnotice (stderr, "mismatched profiles in %s (%d functions"
" vs %d functions)\n",
ret->filename,
ret->n_functions,
info->n_functions);
ret = NULL;
}
return ret;
}
/* Merge the list of gcov_info objects from SRC_PROFILE to TGT_PROFILE.
Return 0 on success: without mismatch.
Reutrn 1 on error. */
int
gcov_profile_merge (struct gcov_info *tgt_profile, struct gcov_info *src_profile,
int w1, int w2)
{
struct gcov_info *gi_ptr;
struct gcov_info **tgt_infos;
struct gcov_info *tgt_tail;
struct gcov_info **in_src_not_tgt;
unsigned tgt_cnt = 0, src_cnt = 0;
unsigned unmatch_info_cnt = 0;
unsigned int i;
for (gi_ptr = tgt_profile; gi_ptr; gi_ptr = gi_ptr->next)
tgt_cnt++;
for (gi_ptr = src_profile; gi_ptr; gi_ptr = gi_ptr->next)
src_cnt++;
tgt_infos = (struct gcov_info **) xmalloc (sizeof (struct gcov_info *)
* tgt_cnt);
gcc_assert (tgt_infos);
in_src_not_tgt = (struct gcov_info **) xmalloc (sizeof (struct gcov_info *)
* src_cnt);
gcc_assert (in_src_not_tgt);
for (gi_ptr = tgt_profile, i = 0; gi_ptr; gi_ptr = gi_ptr->next, i++)
tgt_infos[i] = gi_ptr;
tgt_tail = tgt_infos[tgt_cnt - 1];
/* First pass on tgt_profile, we multiply w1 to all counters. */
if (w1 > 1)
{
for (i = 0; i < tgt_cnt; i++)
gcov_merge (tgt_infos[i], tgt_infos[i], w1-1);
}
/* Second pass, add src_profile to the tgt_profile. */
for (gi_ptr = src_profile; gi_ptr; gi_ptr = gi_ptr->next)
{
struct gcov_info *gi_ptr1;
gi_ptr1 = find_match_gcov_info (tgt_infos, tgt_cnt, gi_ptr);
if (gi_ptr1 == NULL)
{
in_src_not_tgt[unmatch_info_cnt++] = gi_ptr;
continue;
}
gcov_merge (gi_ptr1, gi_ptr, w2);
}
/* For modules in src but not in tgt. We adjust the counter and append. */
for (i = 0; i < unmatch_info_cnt; i++)
{
gi_ptr = in_src_not_tgt[i];
gcov_merge (gi_ptr, gi_ptr, w2 - 1);
tgt_tail->next = gi_ptr;
tgt_tail = gi_ptr;
}
return 0;
}
typedef gcov_type (*counter_op_fn) (gcov_type, void*, void*);
/* Performing FN upon arc counters. */
static void
__gcov_add_counter_op (gcov_type *counters, unsigned n_counters,
counter_op_fn fn, void *data1, void *data2)
{
for (; n_counters; counters++, n_counters--)
{
gcov_type val = *counters;
*counters = fn(val, data1, data2);
}
}
/* Performing FN upon ior counters. */
static void
__gcov_ior_counter_op (gcov_type *counters ATTRIBUTE_UNUSED,
unsigned n_counters ATTRIBUTE_UNUSED,
counter_op_fn fn ATTRIBUTE_UNUSED,
void *data1 ATTRIBUTE_UNUSED,
void *data2 ATTRIBUTE_UNUSED)
{
/* Do nothing. */
}
/* Performing FN upon time-profile counters. */
static void
__gcov_time_profile_counter_op (gcov_type *counters ATTRIBUTE_UNUSED,
unsigned n_counters ATTRIBUTE_UNUSED,
counter_op_fn fn ATTRIBUTE_UNUSED,
void *data1 ATTRIBUTE_UNUSED,
void *data2 ATTRIBUTE_UNUSED)
{
/* Do nothing. */
}
/* Performaing FN upon delta counters. */
static void
__gcov_delta_counter_op (gcov_type *counters, unsigned n_counters,
counter_op_fn fn, void *data1, void *data2)
{
unsigned i, n_measures;
gcc_assert (!(n_counters % 4));
n_measures = n_counters / 4;
for (i = 0; i < n_measures; i++, counters += 4)
{
counters[2] = fn (counters[2], data1, data2);
counters[3] = fn (counters[3], data1, data2);
}
}
/* Performing FN upon single counters. */
static void
__gcov_single_counter_op (gcov_type *counters, unsigned n_counters,
counter_op_fn fn, void *data1, void *data2)
{
unsigned i, n_measures;
gcc_assert (!(n_counters % 3));
n_measures = n_counters / 3;
for (i = 0; i < n_measures; i++, counters += 3)
{
counters[1] = fn (counters[1], data1, data2);
counters[2] = fn (counters[2], data1, data2);
}
}
/* Scaling the counter value V by multiplying *(float*) DATA1. */
static gcov_type
fp_scale (gcov_type v, void *data1, void *data2 ATTRIBUTE_UNUSED)
{
float f = *(float *) data1;
return (gcov_type) (v * f);
}
/* Scaling the counter value V by multiplying DATA2/DATA1. */
static gcov_type
int_scale (gcov_type v, void *data1, void *data2)
{
int n = *(int *) data1;
int d = *(int *) data2;
return (gcov_type) ( RDIV (v,d) * n);
}
/* Type of function used to process counters. */
typedef void (*gcov_counter_fn) (gcov_type *, gcov_unsigned_t,
counter_op_fn, void *, void *);
/* Function array to process profile counters. */
#define DEF_GCOV_COUNTER(COUNTER, NAME, FN_TYPE) \
__gcov ## FN_TYPE ## _counter_op,
static gcov_counter_fn ctr_functions[GCOV_COUNTERS] = {
#include "gcov-counter.def"
};
#undef DEF_GCOV_COUNTER
/* Driver for scaling profile counters. */
int
gcov_profile_scale (struct gcov_info *profile, float scale_factor, int n, int d)
{
struct gcov_info *gi_ptr;
unsigned f_ix;
if (verbose)
fnotice (stdout, "scale_factor is %f or %d/%d\n", scale_factor, n, d);
/* Scaling the counters. */
for (gi_ptr = profile; gi_ptr; gi_ptr = gi_ptr->next)
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];
const struct gcov_ctr_info *ci_ptr;
if (!gfi_ptr || gfi_ptr->key != gi_ptr)
continue;
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;
if (d == 0)
(*ctr_functions[t_ix]) (ci_ptr->values, ci_ptr->num,
fp_scale, &scale_factor, NULL);
else
(*ctr_functions[t_ix]) (ci_ptr->values, ci_ptr->num,
int_scale, &n, &d);
ci_ptr++;
}
}
return 0;
}
/* Driver to normalize profile counters. */
int
gcov_profile_normalize (struct gcov_info *profile, gcov_type max_val)
{
struct gcov_info *gi_ptr;
gcov_type curr_max_val = 0;
unsigned f_ix;
unsigned int i;
float scale_factor;
/* Find the largest count value. */
for (gi_ptr = profile; gi_ptr; gi_ptr = gi_ptr->next)
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];
const struct gcov_ctr_info *ci_ptr;
if (!gfi_ptr || gfi_ptr->key != gi_ptr)
continue;
ci_ptr = gfi_ptr->ctrs;
for (t_ix = 0; t_ix < 1; t_ix++)
{
for (i = 0; i < ci_ptr->num; i++)
if (ci_ptr->values[i] > curr_max_val)
curr_max_val = ci_ptr->values[i];
ci_ptr++;
}
}
scale_factor = (float)max_val / curr_max_val;
if (verbose)
fnotice (stdout, "max_val is %lld\n", (long long) curr_max_val);
return gcov_profile_scale (profile, scale_factor, 0, 0);
}
Reference in New Issue View Git Blame Copy Permalink