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Diffstat (limited to 'third_party/git/blame.h')
| -rw-r--r-- | third_party/git/blame.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/third_party/git/blame.h b/third_party/git/blame.h new file mode 100644 index 000000000000..4a9e1270b036 --- /dev/null +++ b/third_party/git/blame.h @@ -0,0 +1,188 @@ +#ifndef BLAME_H +#define BLAME_H + +#include "cache.h" +#include "commit.h" +#include "xdiff-interface.h" +#include "revision.h" +#include "prio-queue.h" +#include "diff.h" + +#define PICKAXE_BLAME_MOVE 01 +#define PICKAXE_BLAME_COPY 02 +#define PICKAXE_BLAME_COPY_HARDER 04 +#define PICKAXE_BLAME_COPY_HARDEST 010 + +#define BLAME_DEFAULT_MOVE_SCORE 20 +#define BLAME_DEFAULT_COPY_SCORE 40 + +/* + * One blob in a commit that is being suspected + */ +struct blame_origin { + int refcnt; + /* Record preceding blame record for this blob */ + struct blame_origin *previous; + /* origins are put in a list linked via `next' hanging off the + * corresponding commit's util field in order to make finding + * them fast. The presence in this chain does not count + * towards the origin's reference count. It is tempting to + * let it count as long as the commit is pending examination, + * but even under circumstances where the commit will be + * present multiple times in the priority queue of unexamined + * commits, processing the first instance will not leave any + * work requiring the origin data for the second instance. An + * interspersed commit changing that would have to be + * preexisting with a different ancestry and with the same + * commit date in order to wedge itself between two instances + * of the same commit in the priority queue _and_ produce + * blame entries relevant for it. While we don't want to let + * us get tripped up by this case, it certainly does not seem + * worth optimizing for. + */ + struct blame_origin *next; + struct commit *commit; + /* `suspects' contains blame entries that may be attributed to + * this origin's commit or to parent commits. When a commit + * is being processed, all suspects will be moved, either by + * assigning them to an origin in a different commit, or by + * shipping them to the scoreboard's ent list because they + * cannot be attributed to a different commit. + */ + struct blame_entry *suspects; + mmfile_t file; + int num_lines; + void *fingerprints; + struct object_id blob_oid; + unsigned short mode; + /* guilty gets set when shipping any suspects to the final + * blame list instead of other commits + */ + char guilty; + char path[FLEX_ARRAY]; +}; + +/* + * Each group of lines is described by a blame_entry; it can be split + * as we pass blame to the parents. They are arranged in linked lists + * kept as `suspects' of some unprocessed origin, or entered (when the + * blame origin has been finalized) into the scoreboard structure. + * While the scoreboard structure is only sorted at the end of + * processing (according to final image line number), the lists + * attached to an origin are sorted by the target line number. + */ +struct blame_entry { + struct blame_entry *next; + + /* the first line of this group in the final image; + * internally all line numbers are 0 based. + */ + int lno; + + /* how many lines this group has */ + int num_lines; + + /* the commit that introduced this group into the final image */ + struct blame_origin *suspect; + + /* the line number of the first line of this group in the + * suspect's file; internally all line numbers are 0 based. + */ + int s_lno; + + /* how significant this entry is -- cached to avoid + * scanning the lines over and over. + */ + unsigned score; + int ignored; + int unblamable; +}; + +/* + * The current state of the blame assignment. + */ +struct blame_scoreboard { + /* the final commit (i.e. where we started digging from) */ + struct commit *final; + /* Priority queue for commits with unassigned blame records */ + struct prio_queue commits; + struct repository *repo; + struct rev_info *revs; + const char *path; + + /* + * The contents in the final image. + * Used by many functions to obtain contents of the nth line, + * indexed with scoreboard.lineno[blame_entry.lno]. + */ + const char *final_buf; + unsigned long final_buf_size; + + /* linked list of blames */ + struct blame_entry *ent; + + struct oidset ignore_list; + + /* look-up a line in the final buffer */ + int num_lines; + int *lineno; + + /* stats */ + int num_read_blob; + int num_get_patch; + int num_commits; + + /* + * blame for a blame_entry with score lower than these thresholds + * is not passed to the parent using move/copy logic. + */ + unsigned move_score; + unsigned copy_score; + + /* use this file's contents as the final image */ + const char *contents_from; + + /* flags */ + int reverse; + int show_root; + int xdl_opts; + int no_whole_file_rename; + int debug; + + /* callbacks */ + void(*on_sanity_fail)(struct blame_scoreboard *, int); + void(*found_guilty_entry)(struct blame_entry *, void *); + + void *found_guilty_entry_data; +}; + +/* + * Origin is refcounted and usually we keep the blob contents to be + * reused. + */ +static inline struct blame_origin *blame_origin_incref(struct blame_origin *o) +{ + if (o) + o->refcnt++; + return o; +} +void blame_origin_decref(struct blame_origin *o); + +void blame_coalesce(struct blame_scoreboard *sb); +void blame_sort_final(struct blame_scoreboard *sb); +unsigned blame_entry_score(struct blame_scoreboard *sb, struct blame_entry *e); +void assign_blame(struct blame_scoreboard *sb, int opt); +const char *blame_nth_line(struct blame_scoreboard *sb, long lno); + +void init_scoreboard(struct blame_scoreboard *sb); +void setup_scoreboard(struct blame_scoreboard *sb, + const char *path, + struct blame_origin **orig); + +struct blame_entry *blame_entry_prepend(struct blame_entry *head, + long start, long end, + struct blame_origin *o); + +struct blame_origin *get_blame_suspects(struct commit *commit); + +#endif /* BLAME_H */ |