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/*
* This code provides functions to handle gcc's profiling data format
* introduced with gcc 3.4. Future versions of gcc may change the gcov
* format (as happened before), so all format-specific information needs
* to be kept modular and easily exchangeable.
*
* This file is based on gcc-internal definitions. Functions and data
* structures are defined to be compatible with gcc counterparts.
* For a better understanding, refer to gcc source: gcc/gcov-io.h.
*
* Copyright IBM Corp. 2009
* Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
*
* Uses gcc-internal data definitions.
*/
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include "gcov.h"
/* Symbolic links to be created for each profiling data file. */
const struct gcov_link gcov_link[] = {
{ OBJ_TREE, "gcno" }, /* Link to .gcno file in $(objtree). */
{ 0, NULL},
};
/*
* Determine whether a counter is active. Based on gcc magic. Doesn't change
* at run-time.
*/
static int counter_active(struct gcov_info *info, unsigned int type)
{
return (1 << type) & info->ctr_mask;
}
/* Determine number of active counters. Based on gcc magic. */
static unsigned int num_counter_active(struct gcov_info *info)
{
unsigned int i;
unsigned int result = 0;
for (i = 0; i < GCOV_COUNTERS; i++) {
if (counter_active(info, i))
result++;
}
return result;
}
/**
* gcov_info_reset - reset profiling data to zero
* @info: profiling data set
*/
void gcov_info_reset(struct gcov_info *info)
{
unsigned int active = num_counter_active(info);
unsigned int i;
for (i = 0; i < active; i++) {
memset(info->counts[i].values, 0,
info->counts[i].num * sizeof(gcov_type));
}
}
/**
* gcov_info_is_compatible - check if profiling data can be added
* @info1: first profiling data set
* @info2: second profiling data set
*
* Returns non-zero if profiling data can be added, zero otherwise.
*/
int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
{
return (info1->stamp == info2->stamp);
}
/**
* gcov_info_add - add up profiling data
* @dest: profiling data set to which data is added
* @source: profiling data set which is added
*
* Adds profiling counts of @source to @dest.
*/
void gcov_info_add(struct gcov_info *dest, struct gcov_info *source)
{
unsigned int i;
unsigned int j;
for (i = 0; i < num_counter_active(dest); i++) {
for (j = 0; j < dest->counts[i].num; j++) {
dest->counts[i].values[j] +=
source->counts[i].values[j];
}
}
}
/* Get size of function info entry. Based on gcc magic. */
static size_t get_fn_size(struct gcov_info *info)
{
size_t size;
size = sizeof(struct gcov_fn_info) + num_counter_active(info) *
sizeof(unsigned int);
if (__alignof__(struct gcov_fn_info) > sizeof(unsigned int))
size = ALIGN(size, __alignof__(struct gcov_fn_info));
return size;
}
/* Get address of function info entry. Based on gcc magic. */
static struct gcov_fn_info *get_fn_info(struct gcov_info *info, unsigned int fn)
{
return (struct gcov_fn_info *)
((char *) info->functions + fn * get_fn_size(info));
}
/**
* gcov_info_dup - duplicate profiling data set
* @info: profiling data set to duplicate
*
* Return newly allocated duplicate on success, %NULL on error.
*/
struct gcov_info *gcov_info_dup(struct gcov_info *info)
{
struct gcov_info *dup;
unsigned int i;
unsigned int active;
/* Duplicate gcov_info. */
active = num_counter_active(info);
dup = kzalloc(sizeof(struct gcov_info) +
sizeof(struct gcov_ctr_info) * active, GFP_KERNEL);
if (!dup)
return NULL;
dup->version = info->version;
dup->stamp = info->stamp;
dup->n_functions = info->n_functions;
dup->ctr_mask = info->ctr_mask;
/* Duplicate filename. */
dup->filename = kstrdup(info->filename, GFP_KERNEL);
if (!dup->filename)
goto err_free;
/* Duplicate table of functions. */
dup->functions = kmemdup(info->functions, info->n_functions *
get_fn_size(info), GFP_KERNEL);
if (!dup->functions)
goto err_free;
/* Duplicate counter arrays. */
for (i = 0; i < active ; i++) {
struct gcov_ctr_info *ctr = &info->counts[i];
size_t size = ctr->num * sizeof(gcov_type);
dup->counts[i].num = ctr->num;
dup->counts[i].merge = ctr->merge;
dup->counts[i].values = vmalloc(size);
if (!dup->counts[i].values)
goto err_free;
memcpy(dup->counts[i].values, ctr->values, size);
}
return dup;
err_free:
gcov_info_free(dup);
return NULL;
}
/**
* gcov_info_free - release memory for profiling data set duplicate
* @info: profiling data set duplicate to free
*/
void gcov_info_free(struct gcov_info *info)
{
unsigned int active = num_counter_active(info);
unsigned int i;
for (i = 0; i < active ; i++)
vfree(info->counts[i].values);
kfree(info->functions);
kfree(info->filename);
kfree(info);
}
/**
* struct type_info - iterator helper array
* @ctr_type: counter type
* @offset: index of the first value of the current function for this type
*
* This array is needed to convert the in-memory data format into the in-file
* data format:
*
* In-memory:
* for each counter type
* for each function
* values
*
* In-file:
* for each function
* for each counter type
* values
*
* See gcc source gcc/gcov-io.h for more information on data organization.
*/
struct type_info {
int ctr_type;
unsigned int offset;
};
/**
* struct gcov_iterator - specifies current file position in logical records
* @info: associated profiling data
* @record: record type
* @function: function number
* @type: counter type
* @count: index into values array
* @num_types: number of counter types
* @type_info: helper array to get values-array offset for current function
*/
struct gcov_iterator {
struct gcov_info *info;
int record;
unsigned int function;
unsigned int type;
unsigned int count;
int num_types;
struct type_info type_info[0];
};
static struct gcov_fn_info *get_func(struct gcov_iterator *iter)
{
return get_fn_info(iter->info, iter->function);
}
static struct type_info *get_type(struct gcov_iterator *iter)
{
return &iter->type_info[iter->type];
}
/**
* gcov_iter_new - allocate and initialize profiling data iterator
* @info: profiling data set to be iterated
*
* Return file iterator on success, %NULL otherwise.
*/
struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
{
struct gcov_iterator *iter;
iter = kzalloc(sizeof(struct gcov_iterator) +
num_counter_active(info) * sizeof(struct type_info),
GFP_KERNEL);
if (iter)
iter->info = info;
return iter;
}
/**
* gcov_iter_free - release memory for iterator
* @iter: file iterator to free
*/
void gcov_iter_free(struct gcov_iterator *iter)
{
kfree(iter);
}
/**
* gcov_iter_get_info - return profiling data set for given file iterator
* @iter: file iterator
*/
struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter)
{
return iter->info;
}
/**
* gcov_iter_start - reset file iterator to starting position
* @iter: file iterator
*/
void gcov_iter_start(struct gcov_iterator *iter)
{
int i;
iter->record = 0;
iter->function = 0;
iter->type = 0;
iter->count = 0;
iter->num_types = 0;
for (i = 0; i < GCOV_COUNTERS; i++) {
if (counter_active(iter->info, i)) {
iter->type_info[iter->num_types].ctr_type = i;
iter->type_info[iter
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