linux/kernel/gcov/gcov.h
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   1/*
   2 *  Profiling infrastructure declarations.
   3 *
   4 *  This file is based on gcc-internal definitions. Data structures are
   5 *  defined to be compatible with gcc counterparts. For a better
   6 *  understanding, refer to gcc source: gcc/gcov-io.h.
   7 *
   8 *    Copyright IBM Corp. 2009
   9 *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
  10 *
  11 *    Uses gcc-internal data definitions.
  12 */
  13
  14#ifndef GCOV_H
  15#define GCOV_H GCOV_H
  16
  17#include <linux/types.h>
  18
  19/*
  20 * Profiling data types used for gcc 3.4 and above - these are defined by
  21 * gcc and need to be kept as close to the original definition as possible to
  22 * remain compatible.
  23 */
  24#define GCOV_COUNTERS           5
  25#define GCOV_DATA_MAGIC         ((unsigned int) 0x67636461)
  26#define GCOV_TAG_FUNCTION       ((unsigned int) 0x01000000)
  27#define GCOV_TAG_COUNTER_BASE   ((unsigned int) 0x01a10000)
  28#define GCOV_TAG_FOR_COUNTER(count)                                     \
  29        (GCOV_TAG_COUNTER_BASE + ((unsigned int) (count) << 17))
  30
  31#if BITS_PER_LONG >= 64
  32typedef long gcov_type;
  33#else
  34typedef long long gcov_type;
  35#endif
  36
  37/**
  38 * struct gcov_fn_info - profiling meta data per function
  39 * @ident: object file-unique function identifier
  40 * @checksum: function checksum
  41 * @n_ctrs: number of values per counter type belonging to this function
  42 *
  43 * This data is generated by gcc during compilation and doesn't change
  44 * at run-time.
  45 */
  46struct gcov_fn_info {
  47        unsigned int ident;
  48        unsigned int checksum;
  49        unsigned int n_ctrs[0];
  50};
  51
  52/**
  53 * struct gcov_ctr_info - profiling data per counter type
  54 * @num: number of counter values for this type
  55 * @values: array of counter values for this type
  56 * @merge: merge function for counter values of this type (unused)
  57 *
  58 * This data is generated by gcc during compilation and doesn't change
  59 * at run-time with the exception of the values array.
  60 */
  61struct gcov_ctr_info {
  62        unsigned int    num;
  63        gcov_type       *values;
  64        void            (*merge)(gcov_type *, unsigned int);
  65};
  66
  67/**
  68 * struct gcov_info - profiling data per object file
  69 * @version: gcov version magic indicating the gcc version used for compilation
  70 * @next: list head for a singly-linked list
  71 * @stamp: time stamp
  72 * @filename: name of the associated gcov data file
  73 * @n_functions: number of instrumented functions
  74 * @functions: function data
  75 * @ctr_mask: mask specifying which counter types are active
  76 * @counts: counter data per counter type
  77 *
  78 * This data is generated by gcc during compilation and doesn't change
  79 * at run-time with the exception of the next pointer.
  80 */
  81struct gcov_info {
  82        unsigned int                    version;
  83        struct gcov_info                *next;
  84        unsigned int                    stamp;
  85        const char                      *filename;
  86        unsigned int                    n_functions;
  87        const struct gcov_fn_info       *functions;
  88        unsigned int                    ctr_mask;
  89        struct gcov_ctr_info            counts[0];
  90};
  91
  92/* Base interface. */
  93enum gcov_action {
  94        GCOV_ADD,
  95        GCOV_REMOVE,
  96};
  97
  98void gcov_event(enum gcov_action action, struct gcov_info *info);
  99void gcov_enable_events(void);
 100
 101/* Iterator control. */
 102struct seq_file;
 103struct gcov_iterator;
 104
 105struct gcov_iterator *gcov_iter_new(struct gcov_info *info);
 106void gcov_iter_free(struct gcov_iterator *iter);
 107void gcov_iter_start(struct gcov_iterator *iter);
 108int gcov_iter_next(struct gcov_iterator *iter);
 109int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq);
 110struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter);
 111
 112/* gcov_info control. */
 113void gcov_info_reset(struct gcov_info *info);
 114int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2);
 115void gcov_info_add(struct gcov_info *dest, struct gcov_info *source);
 116struct gcov_info *gcov_info_dup(struct gcov_info *info);
 117void gcov_info_free(struct gcov_info *info);
 118
 119struct gcov_link {
 120        enum {
 121                OBJ_TREE,
 122                SRC_TREE,
 123        } dir;
 124        const char *ext;
 125};
 126extern const struct gcov_link gcov_link[];
 127
 128#endif /* GCOV_H */
 129
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