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/*
* This code provides functions to handle gcc's profiling data format
* introduced with gcc 4.7.
*
* This file is based heavily on gcc_3_4.c file.
*
* For a better understanding, refer to gcc source:
* gcc/gcov-io.h
* libgcc/libgcov.c
*
* Uses gcc-internal data definitions.
*
* Imported from Linux and modified for Xen by
* Wei Liu <wei.liu2@citrix.com>
*/
#include <xen/string.h>
#include "gcov.h"
/*
* GCOV_COUNTERS will be defined if this file is included by other
* source files.
*/
#ifndef GCOV_COUNTERS
# if !(GCC_VERSION >= 40700 && GCC_VERSION < 40900)
# error "Wrong version of GCC used to compile gcov"
# endif
#define GCOV_COUNTERS 8
#endif
#define GCOV_TAG_FUNCTION_LENGTH 3
static struct gcov_info *gcov_info_head;
/**
* struct gcov_ctr_info - information about counters for a single function
* @num: number of counter values for this type
* @values: array of counter values for this type
*
* This data is generated by gcc during compilation and doesn't change
* at run-time with the exception of the values array.
*/
struct gcov_ctr_info {
unsigned int num;
gcov_type *values;
};
/**
* struct gcov_fn_info - profiling meta data per function
* @key: comdat key
* @ident: unique ident of function
* @lineno_checksum: function lineo_checksum
* @cfg_checksum: function cfg checksum
* @ctrs: instrumented counters
*
* This data is generated by gcc during compilation and doesn't change
* at run-time.
*
* Information about a single function. This uses the trailing array
* idiom. The number of counters is determined from the merge pointer
* array in gcov_info. The key is used to detect which of a set of
* comdat functions was selected -- it points to the gcov_info object
* of the object file containing the selected comdat function.
*/
struct gcov_fn_info {
const struct gcov_info *key;
unsigned int ident;
unsigned int lineno_checksum;
unsigned int cfg_checksum;
struct gcov_ctr_info ctrs[0];
};
/**
* struct gcov_info - profiling data per object file
* @version: gcov version magic indicating the gcc version used for compilation
* @next: list head for a singly-linked list
* @stamp: uniquifying time stamp
* @filename: name of the associated gcov data file
* @merge: merge functions (null for unused counter type)
* @n_functions: number of instrumented functions
* @functions: pointer to pointers to function information
*
* This data is generated by gcc during compilation and doesn't change
* at run-time with the exception of the next pointer.
*/
struct gcov_info {
unsigned int version;
struct gcov_info *next;
unsigned int stamp;
const char *filename;
void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
unsigned int n_functions;
struct gcov_fn_info **functions;
};
static int counter_active(const struct gcov_info *info, unsigned int type)
{
return info->merge[type] ? 1 : 0;
}
void gcov_info_link(struct gcov_info *info)
{
info->next = gcov_info_head;
gcov_info_head = info;
}
struct gcov_info *gcov_info_next(const struct gcov_info *info)
{
if ( !info )
return gcov_info_head;
return info->next;
}
void gcov_info_reset(struct gcov_info *info)
{
struct gcov_ctr_info *ci_ptr;
unsigned int fi_idx;
unsigned int ct_idx;
for ( fi_idx = 0; fi_idx < info->n_functions; fi_idx++ )
{
ci_ptr = info->functions[fi_idx]->ctrs;
for ( ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++ )
{
if ( !counter_active(info, ct_idx) )
continue;
memset(ci_ptr->values, 0, sizeof(gcov_type) * ci_ptr->num);
ci_ptr++;
}
}
}
const char *gcov_info_filename(const struct gcov_info *info)
{
return info->filename;
}
/**
* gcov_info_to_gcda - convert profiling data set to gcda file format
* @buffer: the buffer to store file data or %NULL if no data should be stored
* @info: profiling data set to be converted
*
* Returns the number of bytes that were/would have been stored into the buffer.
*/
size_t gcov_info_to_gcda(char *buffer, const struct gcov_info *info)
{
struct gcov_fn_info *fi_ptr;
struct gcov_ctr_info *ci_ptr;
unsigned int fi_idx;
unsigned int ct_idx;
unsigned int cv_idx;
size_t pos = 0;
/* File header. */
pos += gcov_store_uint32(buffer, pos, GCOV_DATA_MAGIC);
pos += gcov_store_uint32(buffer, pos, info->version);
pos += gcov_store_uint32(buffer, pos, info->stamp);
for ( fi_idx = 0; fi_idx < info->n_functions; fi_idx++ )
{
fi_ptr = info->functions[fi_idx];
/* Function record. */
pos += gcov_store_uint32(buffer, pos, GCOV_TAG_FUNCTION);
pos += gcov_store_uint32(buffer, pos, GCOV_TAG_FUNCTION_LENGTH);
pos += gcov_store_uint32(buffer, pos, fi_ptr->ident);
pos += gcov_store_uint32(buffer, pos, fi_ptr->lineno_checksum);
pos += gcov_store_uint32(buffer, pos, fi_ptr->cfg_checksum);
ci_ptr = fi_ptr->ctrs;
for ( ct_idx = 0; ct_idx < GCOV_COUNTERS; ct_idx++ )
{
if (! counter_active(info, ct_idx) )
continue;
/* Counter record. */
pos += gcov_store_uint32(buffer, pos,
GCOV_TAG_FOR_COUNTER(ct_idx));
pos += gcov_store_uint32(buffer, pos, ci_ptr->num * 2);
for ( cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++ )
pos += gcov_store_uint64(buffer, pos, ci_ptr->values[cv_idx]);
ci_ptr++;
}
}
return pos;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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