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483709ab4d
A hotfix to a topic already in 'master'. * js/blame-lib: blame: fix memory corruption scrambling revision name in error message
1865 lines
50 KiB
C
1865 lines
50 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "cache-tree.h"
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#include "mergesort.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "tag.h"
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#include "blame.h"
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void blame_origin_decref(struct blame_origin *o)
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{
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if (o && --o->refcnt <= 0) {
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struct blame_origin *p, *l = NULL;
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if (o->previous)
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blame_origin_decref(o->previous);
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free(o->file.ptr);
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/* Should be present exactly once in commit chain */
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for (p = o->commit->util; p; l = p, p = p->next) {
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if (p == o) {
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if (l)
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l->next = p->next;
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else
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o->commit->util = p->next;
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free(o);
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return;
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}
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}
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die("internal error in blame_origin_decref");
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}
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}
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/*
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* Given a commit and a path in it, create a new origin structure.
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* The callers that add blame to the scoreboard should use
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* get_origin() to obtain shared, refcounted copy instead of calling
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* this function directly.
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*/
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static struct blame_origin *make_origin(struct commit *commit, const char *path)
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{
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struct blame_origin *o;
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FLEX_ALLOC_STR(o, path, path);
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o->commit = commit;
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o->refcnt = 1;
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o->next = commit->util;
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commit->util = o;
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return o;
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}
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/*
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* Locate an existing origin or create a new one.
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* This moves the origin to front position in the commit util list.
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*/
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static struct blame_origin *get_origin(struct commit *commit, const char *path)
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{
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struct blame_origin *o, *l;
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for (o = commit->util, l = NULL; o; l = o, o = o->next) {
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if (!strcmp(o->path, path)) {
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/* bump to front */
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if (l) {
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l->next = o->next;
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o->next = commit->util;
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commit->util = o;
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}
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return blame_origin_incref(o);
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}
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}
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return make_origin(commit, path);
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}
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static void verify_working_tree_path(struct commit *work_tree, const char *path)
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{
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struct commit_list *parents;
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int pos;
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for (parents = work_tree->parents; parents; parents = parents->next) {
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const struct object_id *commit_oid = &parents->item->object.oid;
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struct object_id blob_oid;
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unsigned mode;
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if (!get_tree_entry(commit_oid->hash, path, blob_oid.hash, &mode) &&
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sha1_object_info(blob_oid.hash, NULL) == OBJ_BLOB)
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return;
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}
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pos = cache_name_pos(path, strlen(path));
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if (pos >= 0)
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; /* path is in the index */
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else if (-1 - pos < active_nr &&
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!strcmp(active_cache[-1 - pos]->name, path))
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; /* path is in the index, unmerged */
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else
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die("no such path '%s' in HEAD", path);
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}
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static struct commit_list **append_parent(struct commit_list **tail, const struct object_id *oid)
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{
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struct commit *parent;
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parent = lookup_commit_reference(oid);
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if (!parent)
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die("no such commit %s", oid_to_hex(oid));
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return &commit_list_insert(parent, tail)->next;
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}
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static void append_merge_parents(struct commit_list **tail)
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{
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int merge_head;
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struct strbuf line = STRBUF_INIT;
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merge_head = open(git_path_merge_head(), O_RDONLY);
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if (merge_head < 0) {
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if (errno == ENOENT)
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return;
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die("cannot open '%s' for reading", git_path_merge_head());
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}
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while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) {
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struct object_id oid;
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if (line.len < GIT_SHA1_HEXSZ || get_oid_hex(line.buf, &oid))
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die("unknown line in '%s': %s", git_path_merge_head(), line.buf);
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tail = append_parent(tail, &oid);
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}
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close(merge_head);
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strbuf_release(&line);
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}
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/*
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* This isn't as simple as passing sb->buf and sb->len, because we
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* want to transfer ownership of the buffer to the commit (so we
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* must use detach).
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*/
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static void set_commit_buffer_from_strbuf(struct commit *c, struct strbuf *sb)
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{
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size_t len;
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void *buf = strbuf_detach(sb, &len);
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set_commit_buffer(c, buf, len);
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}
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/*
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* Prepare a dummy commit that represents the work tree (or staged) item.
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* Note that annotating work tree item never works in the reverse.
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*/
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static struct commit *fake_working_tree_commit(struct diff_options *opt,
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const char *path,
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const char *contents_from)
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{
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struct commit *commit;
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struct blame_origin *origin;
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struct commit_list **parent_tail, *parent;
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struct object_id head_oid;
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struct strbuf buf = STRBUF_INIT;
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const char *ident;
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time_t now;
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int size, len;
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struct cache_entry *ce;
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unsigned mode;
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struct strbuf msg = STRBUF_INIT;
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read_cache();
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time(&now);
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commit = alloc_commit_node();
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commit->object.parsed = 1;
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commit->date = now;
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parent_tail = &commit->parents;
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if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL))
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die("no such ref: HEAD");
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parent_tail = append_parent(parent_tail, &head_oid);
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append_merge_parents(parent_tail);
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verify_working_tree_path(commit, path);
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origin = make_origin(commit, path);
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ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
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strbuf_addstr(&msg, "tree 0000000000000000000000000000000000000000\n");
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for (parent = commit->parents; parent; parent = parent->next)
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strbuf_addf(&msg, "parent %s\n",
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oid_to_hex(&parent->item->object.oid));
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strbuf_addf(&msg,
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"author %s\n"
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"committer %s\n\n"
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"Version of %s from %s\n",
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ident, ident, path,
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(!contents_from ? path :
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(!strcmp(contents_from, "-") ? "standard input" : contents_from)));
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set_commit_buffer_from_strbuf(commit, &msg);
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if (!contents_from || strcmp("-", contents_from)) {
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struct stat st;
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const char *read_from;
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char *buf_ptr;
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unsigned long buf_len;
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if (contents_from) {
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if (stat(contents_from, &st) < 0)
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die_errno("Cannot stat '%s'", contents_from);
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read_from = contents_from;
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}
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else {
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if (lstat(path, &st) < 0)
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die_errno("Cannot lstat '%s'", path);
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read_from = path;
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}
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mode = canon_mode(st.st_mode);
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switch (st.st_mode & S_IFMT) {
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case S_IFREG:
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if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
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textconv_object(read_from, mode, &null_oid, 0, &buf_ptr, &buf_len))
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strbuf_attach(&buf, buf_ptr, buf_len, buf_len + 1);
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else if (strbuf_read_file(&buf, read_from, st.st_size) != st.st_size)
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die_errno("cannot open or read '%s'", read_from);
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break;
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case S_IFLNK:
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if (strbuf_readlink(&buf, read_from, st.st_size) < 0)
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die_errno("cannot readlink '%s'", read_from);
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break;
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default:
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die("unsupported file type %s", read_from);
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}
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}
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else {
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/* Reading from stdin */
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mode = 0;
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if (strbuf_read(&buf, 0, 0) < 0)
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die_errno("failed to read from stdin");
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}
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convert_to_git(&the_index, path, buf.buf, buf.len, &buf, 0);
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origin->file.ptr = buf.buf;
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origin->file.size = buf.len;
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pretend_sha1_file(buf.buf, buf.len, OBJ_BLOB, origin->blob_oid.hash);
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/*
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* Read the current index, replace the path entry with
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* origin->blob_sha1 without mucking with its mode or type
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* bits; we are not going to write this index out -- we just
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* want to run "diff-index --cached".
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*/
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discard_cache();
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read_cache();
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len = strlen(path);
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if (!mode) {
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int pos = cache_name_pos(path, len);
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if (0 <= pos)
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mode = active_cache[pos]->ce_mode;
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else
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/* Let's not bother reading from HEAD tree */
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mode = S_IFREG | 0644;
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}
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size = cache_entry_size(len);
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ce = xcalloc(1, size);
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oidcpy(&ce->oid, &origin->blob_oid);
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memcpy(ce->name, path, len);
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ce->ce_flags = create_ce_flags(0);
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ce->ce_namelen = len;
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ce->ce_mode = create_ce_mode(mode);
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add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
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cache_tree_invalidate_path(&the_index, path);
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return commit;
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}
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static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b,
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xdl_emit_hunk_consume_func_t hunk_func, void *cb_data, int xdl_opts)
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{
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xpparam_t xpp = {0};
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xdemitconf_t xecfg = {0};
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xdemitcb_t ecb = {NULL};
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xpp.flags = xdl_opts;
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xecfg.hunk_func = hunk_func;
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ecb.priv = cb_data;
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return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb);
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}
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/*
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* Given an origin, prepare mmfile_t structure to be used by the
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* diff machinery
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*/
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static void fill_origin_blob(struct diff_options *opt,
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struct blame_origin *o, mmfile_t *file, int *num_read_blob)
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{
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if (!o->file.ptr) {
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enum object_type type;
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unsigned long file_size;
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(*num_read_blob)++;
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if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
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textconv_object(o->path, o->mode, &o->blob_oid, 1, &file->ptr, &file_size))
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;
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else
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file->ptr = read_sha1_file(o->blob_oid.hash, &type,
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&file_size);
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file->size = file_size;
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if (!file->ptr)
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die("Cannot read blob %s for path %s",
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oid_to_hex(&o->blob_oid),
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o->path);
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o->file = *file;
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}
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else
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*file = o->file;
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}
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static void drop_origin_blob(struct blame_origin *o)
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{
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if (o->file.ptr) {
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FREE_AND_NULL(o->file.ptr);
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}
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}
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/*
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* Any merge of blames happens on lists of blames that arrived via
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* different parents in a single suspect. In this case, we want to
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* sort according to the suspect line numbers as opposed to the final
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* image line numbers. The function body is somewhat longish because
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* it avoids unnecessary writes.
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*/
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static struct blame_entry *blame_merge(struct blame_entry *list1,
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struct blame_entry *list2)
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{
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struct blame_entry *p1 = list1, *p2 = list2,
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**tail = &list1;
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if (!p1)
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return p2;
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if (!p2)
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return p1;
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if (p1->s_lno <= p2->s_lno) {
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do {
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tail = &p1->next;
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if ((p1 = *tail) == NULL) {
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*tail = p2;
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return list1;
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}
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} while (p1->s_lno <= p2->s_lno);
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}
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for (;;) {
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*tail = p2;
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do {
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tail = &p2->next;
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if ((p2 = *tail) == NULL) {
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*tail = p1;
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return list1;
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}
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} while (p1->s_lno > p2->s_lno);
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*tail = p1;
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do {
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tail = &p1->next;
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if ((p1 = *tail) == NULL) {
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*tail = p2;
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return list1;
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}
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} while (p1->s_lno <= p2->s_lno);
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}
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}
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static void *get_next_blame(const void *p)
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{
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return ((struct blame_entry *)p)->next;
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}
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static void set_next_blame(void *p1, void *p2)
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{
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((struct blame_entry *)p1)->next = p2;
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}
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/*
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* Final image line numbers are all different, so we don't need a
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* three-way comparison here.
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*/
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static int compare_blame_final(const void *p1, const void *p2)
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{
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return ((struct blame_entry *)p1)->lno > ((struct blame_entry *)p2)->lno
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? 1 : -1;
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}
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static int compare_blame_suspect(const void *p1, const void *p2)
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{
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const struct blame_entry *s1 = p1, *s2 = p2;
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/*
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* to allow for collating suspects, we sort according to the
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* respective pointer value as the primary sorting criterion.
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* The actual relation is pretty unimportant as long as it
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* establishes a total order. Comparing as integers gives us
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* that.
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*/
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if (s1->suspect != s2->suspect)
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return (intptr_t)s1->suspect > (intptr_t)s2->suspect ? 1 : -1;
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if (s1->s_lno == s2->s_lno)
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return 0;
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return s1->s_lno > s2->s_lno ? 1 : -1;
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}
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void blame_sort_final(struct blame_scoreboard *sb)
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{
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sb->ent = llist_mergesort(sb->ent, get_next_blame, set_next_blame,
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compare_blame_final);
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}
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static int compare_commits_by_reverse_commit_date(const void *a,
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const void *b,
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void *c)
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{
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return -compare_commits_by_commit_date(a, b, c);
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}
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/*
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* For debugging -- origin is refcounted, and this asserts that
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* we do not underflow.
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*/
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static void sanity_check_refcnt(struct blame_scoreboard *sb)
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{
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int baa = 0;
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struct blame_entry *ent;
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for (ent = sb->ent; ent; ent = ent->next) {
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/* Nobody should have zero or negative refcnt */
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if (ent->suspect->refcnt <= 0) {
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fprintf(stderr, "%s in %s has negative refcnt %d\n",
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ent->suspect->path,
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oid_to_hex(&ent->suspect->commit->object.oid),
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ent->suspect->refcnt);
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baa = 1;
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}
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}
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if (baa)
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sb->on_sanity_fail(sb, baa);
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}
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/*
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* If two blame entries that are next to each other came from
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* contiguous lines in the same origin (i.e. <commit, path> pair),
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* merge them together.
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*/
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void blame_coalesce(struct blame_scoreboard *sb)
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{
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struct blame_entry *ent, *next;
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for (ent = sb->ent; ent && (next = ent->next); ent = next) {
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if (ent->suspect == next->suspect &&
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ent->s_lno + ent->num_lines == next->s_lno) {
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ent->num_lines += next->num_lines;
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ent->next = next->next;
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blame_origin_decref(next->suspect);
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free(next);
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ent->score = 0;
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next = ent; /* again */
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}
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}
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if (sb->debug) /* sanity */
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sanity_check_refcnt(sb);
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}
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/*
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* Merge the given sorted list of blames into a preexisting origin.
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* If there were no previous blames to that commit, it is entered into
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* the commit priority queue of the score board.
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*/
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static void queue_blames(struct blame_scoreboard *sb, struct blame_origin *porigin,
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struct blame_entry *sorted)
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{
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if (porigin->suspects)
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porigin->suspects = blame_merge(porigin->suspects, sorted);
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else {
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struct blame_origin *o;
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for (o = porigin->commit->util; o; o = o->next) {
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if (o->suspects) {
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porigin->suspects = sorted;
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return;
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}
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}
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porigin->suspects = sorted;
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prio_queue_put(&sb->commits, porigin->commit);
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}
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}
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/*
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* Fill the blob_sha1 field of an origin if it hasn't, so that later
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* call to fill_origin_blob() can use it to locate the data. blob_sha1
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* for an origin is also used to pass the blame for the entire file to
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* the parent to detect the case where a child's blob is identical to
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* that of its parent's.
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*
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* This also fills origin->mode for corresponding tree path.
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*/
|
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static int fill_blob_sha1_and_mode(struct blame_origin *origin)
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{
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if (!is_null_oid(&origin->blob_oid))
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return 0;
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if (get_tree_entry(origin->commit->object.oid.hash,
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origin->path,
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origin->blob_oid.hash, &origin->mode))
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goto error_out;
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if (sha1_object_info(origin->blob_oid.hash, NULL) != OBJ_BLOB)
|
|
goto error_out;
|
|
return 0;
|
|
error_out:
|
|
oidclr(&origin->blob_oid);
|
|
origin->mode = S_IFINVALID;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* We have an origin -- check if the same path exists in the
|
|
* parent and return an origin structure to represent it.
|
|
*/
|
|
static struct blame_origin *find_origin(struct commit *parent,
|
|
struct blame_origin *origin)
|
|
{
|
|
struct blame_origin *porigin;
|
|
struct diff_options diff_opts;
|
|
const char *paths[2];
|
|
|
|
/* First check any existing origins */
|
|
for (porigin = parent->util; porigin; porigin = porigin->next)
|
|
if (!strcmp(porigin->path, origin->path)) {
|
|
/*
|
|
* The same path between origin and its parent
|
|
* without renaming -- the most common case.
|
|
*/
|
|
return blame_origin_incref (porigin);
|
|
}
|
|
|
|
/* See if the origin->path is different between parent
|
|
* and origin first. Most of the time they are the
|
|
* same and diff-tree is fairly efficient about this.
|
|
*/
|
|
diff_setup(&diff_opts);
|
|
DIFF_OPT_SET(&diff_opts, RECURSIVE);
|
|
diff_opts.detect_rename = 0;
|
|
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
paths[0] = origin->path;
|
|
paths[1] = NULL;
|
|
|
|
parse_pathspec(&diff_opts.pathspec,
|
|
PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL,
|
|
PATHSPEC_LITERAL_PATH, "", paths);
|
|
diff_setup_done(&diff_opts);
|
|
|
|
if (is_null_oid(&origin->commit->object.oid))
|
|
do_diff_cache(&parent->tree->object.oid, &diff_opts);
|
|
else
|
|
diff_tree_oid(&parent->tree->object.oid,
|
|
&origin->commit->tree->object.oid,
|
|
"", &diff_opts);
|
|
diffcore_std(&diff_opts);
|
|
|
|
if (!diff_queued_diff.nr) {
|
|
/* The path is the same as parent */
|
|
porigin = get_origin(parent, origin->path);
|
|
oidcpy(&porigin->blob_oid, &origin->blob_oid);
|
|
porigin->mode = origin->mode;
|
|
} else {
|
|
/*
|
|
* Since origin->path is a pathspec, if the parent
|
|
* commit had it as a directory, we will see a whole
|
|
* bunch of deletion of files in the directory that we
|
|
* do not care about.
|
|
*/
|
|
int i;
|
|
struct diff_filepair *p = NULL;
|
|
for (i = 0; i < diff_queued_diff.nr; i++) {
|
|
const char *name;
|
|
p = diff_queued_diff.queue[i];
|
|
name = p->one->path ? p->one->path : p->two->path;
|
|
if (!strcmp(name, origin->path))
|
|
break;
|
|
}
|
|
if (!p)
|
|
die("internal error in blame::find_origin");
|
|
switch (p->status) {
|
|
default:
|
|
die("internal error in blame::find_origin (%c)",
|
|
p->status);
|
|
case 'M':
|
|
porigin = get_origin(parent, origin->path);
|
|
oidcpy(&porigin->blob_oid, &p->one->oid);
|
|
porigin->mode = p->one->mode;
|
|
break;
|
|
case 'A':
|
|
case 'T':
|
|
/* Did not exist in parent, or type changed */
|
|
break;
|
|
}
|
|
}
|
|
diff_flush(&diff_opts);
|
|
clear_pathspec(&diff_opts.pathspec);
|
|
return porigin;
|
|
}
|
|
|
|
/*
|
|
* We have an origin -- find the path that corresponds to it in its
|
|
* parent and return an origin structure to represent it.
|
|
*/
|
|
static struct blame_origin *find_rename(struct commit *parent,
|
|
struct blame_origin *origin)
|
|
{
|
|
struct blame_origin *porigin = NULL;
|
|
struct diff_options diff_opts;
|
|
int i;
|
|
|
|
diff_setup(&diff_opts);
|
|
DIFF_OPT_SET(&diff_opts, RECURSIVE);
|
|
diff_opts.detect_rename = DIFF_DETECT_RENAME;
|
|
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
diff_opts.single_follow = origin->path;
|
|
diff_setup_done(&diff_opts);
|
|
|
|
if (is_null_oid(&origin->commit->object.oid))
|
|
do_diff_cache(&parent->tree->object.oid, &diff_opts);
|
|
else
|
|
diff_tree_oid(&parent->tree->object.oid,
|
|
&origin->commit->tree->object.oid,
|
|
"", &diff_opts);
|
|
diffcore_std(&diff_opts);
|
|
|
|
for (i = 0; i < diff_queued_diff.nr; i++) {
|
|
struct diff_filepair *p = diff_queued_diff.queue[i];
|
|
if ((p->status == 'R' || p->status == 'C') &&
|
|
!strcmp(p->two->path, origin->path)) {
|
|
porigin = get_origin(parent, p->one->path);
|
|
oidcpy(&porigin->blob_oid, &p->one->oid);
|
|
porigin->mode = p->one->mode;
|
|
break;
|
|
}
|
|
}
|
|
diff_flush(&diff_opts);
|
|
clear_pathspec(&diff_opts.pathspec);
|
|
return porigin;
|
|
}
|
|
|
|
/*
|
|
* Append a new blame entry to a given output queue.
|
|
*/
|
|
static void add_blame_entry(struct blame_entry ***queue,
|
|
const struct blame_entry *src)
|
|
{
|
|
struct blame_entry *e = xmalloc(sizeof(*e));
|
|
memcpy(e, src, sizeof(*e));
|
|
blame_origin_incref(e->suspect);
|
|
|
|
e->next = **queue;
|
|
**queue = e;
|
|
*queue = &e->next;
|
|
}
|
|
|
|
/*
|
|
* src typically is on-stack; we want to copy the information in it to
|
|
* a malloced blame_entry that gets added to the given queue. The
|
|
* origin of dst loses a refcnt.
|
|
*/
|
|
static void dup_entry(struct blame_entry ***queue,
|
|
struct blame_entry *dst, struct blame_entry *src)
|
|
{
|
|
blame_origin_incref(src->suspect);
|
|
blame_origin_decref(dst->suspect);
|
|
memcpy(dst, src, sizeof(*src));
|
|
dst->next = **queue;
|
|
**queue = dst;
|
|
*queue = &dst->next;
|
|
}
|
|
|
|
const char *blame_nth_line(struct blame_scoreboard *sb, long lno)
|
|
{
|
|
return sb->final_buf + sb->lineno[lno];
|
|
}
|
|
|
|
/*
|
|
* It is known that lines between tlno to same came from parent, and e
|
|
* has an overlap with that range. it also is known that parent's
|
|
* line plno corresponds to e's line tlno.
|
|
*
|
|
* <---- e ----->
|
|
* <------>
|
|
* <------------>
|
|
* <------------>
|
|
* <------------------>
|
|
*
|
|
* Split e into potentially three parts; before this chunk, the chunk
|
|
* to be blamed for the parent, and after that portion.
|
|
*/
|
|
static void split_overlap(struct blame_entry *split,
|
|
struct blame_entry *e,
|
|
int tlno, int plno, int same,
|
|
struct blame_origin *parent)
|
|
{
|
|
int chunk_end_lno;
|
|
memset(split, 0, sizeof(struct blame_entry [3]));
|
|
|
|
if (e->s_lno < tlno) {
|
|
/* there is a pre-chunk part not blamed on parent */
|
|
split[0].suspect = blame_origin_incref(e->suspect);
|
|
split[0].lno = e->lno;
|
|
split[0].s_lno = e->s_lno;
|
|
split[0].num_lines = tlno - e->s_lno;
|
|
split[1].lno = e->lno + tlno - e->s_lno;
|
|
split[1].s_lno = plno;
|
|
}
|
|
else {
|
|
split[1].lno = e->lno;
|
|
split[1].s_lno = plno + (e->s_lno - tlno);
|
|
}
|
|
|
|
if (same < e->s_lno + e->num_lines) {
|
|
/* there is a post-chunk part not blamed on parent */
|
|
split[2].suspect = blame_origin_incref(e->suspect);
|
|
split[2].lno = e->lno + (same - e->s_lno);
|
|
split[2].s_lno = e->s_lno + (same - e->s_lno);
|
|
split[2].num_lines = e->s_lno + e->num_lines - same;
|
|
chunk_end_lno = split[2].lno;
|
|
}
|
|
else
|
|
chunk_end_lno = e->lno + e->num_lines;
|
|
split[1].num_lines = chunk_end_lno - split[1].lno;
|
|
|
|
/*
|
|
* if it turns out there is nothing to blame the parent for,
|
|
* forget about the splitting. !split[1].suspect signals this.
|
|
*/
|
|
if (split[1].num_lines < 1)
|
|
return;
|
|
split[1].suspect = blame_origin_incref(parent);
|
|
}
|
|
|
|
/*
|
|
* split_overlap() divided an existing blame e into up to three parts
|
|
* in split. Any assigned blame is moved to queue to
|
|
* reflect the split.
|
|
*/
|
|
static void split_blame(struct blame_entry ***blamed,
|
|
struct blame_entry ***unblamed,
|
|
struct blame_entry *split,
|
|
struct blame_entry *e)
|
|
{
|
|
if (split[0].suspect && split[2].suspect) {
|
|
/* The first part (reuse storage for the existing entry e) */
|
|
dup_entry(unblamed, e, &split[0]);
|
|
|
|
/* The last part -- me */
|
|
add_blame_entry(unblamed, &split[2]);
|
|
|
|
/* ... and the middle part -- parent */
|
|
add_blame_entry(blamed, &split[1]);
|
|
}
|
|
else if (!split[0].suspect && !split[2].suspect)
|
|
/*
|
|
* The parent covers the entire area; reuse storage for
|
|
* e and replace it with the parent.
|
|
*/
|
|
dup_entry(blamed, e, &split[1]);
|
|
else if (split[0].suspect) {
|
|
/* me and then parent */
|
|
dup_entry(unblamed, e, &split[0]);
|
|
add_blame_entry(blamed, &split[1]);
|
|
}
|
|
else {
|
|
/* parent and then me */
|
|
dup_entry(blamed, e, &split[1]);
|
|
add_blame_entry(unblamed, &split[2]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* After splitting the blame, the origins used by the
|
|
* on-stack blame_entry should lose one refcnt each.
|
|
*/
|
|
static void decref_split(struct blame_entry *split)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 3; i++)
|
|
blame_origin_decref(split[i].suspect);
|
|
}
|
|
|
|
/*
|
|
* reverse_blame reverses the list given in head, appending tail.
|
|
* That allows us to build lists in reverse order, then reverse them
|
|
* afterwards. This can be faster than building the list in proper
|
|
* order right away. The reason is that building in proper order
|
|
* requires writing a link in the _previous_ element, while building
|
|
* in reverse order just requires placing the list head into the
|
|
* _current_ element.
|
|
*/
|
|
|
|
static struct blame_entry *reverse_blame(struct blame_entry *head,
|
|
struct blame_entry *tail)
|
|
{
|
|
while (head) {
|
|
struct blame_entry *next = head->next;
|
|
head->next = tail;
|
|
tail = head;
|
|
head = next;
|
|
}
|
|
return tail;
|
|
}
|
|
|
|
/*
|
|
* Process one hunk from the patch between the current suspect for
|
|
* blame_entry e and its parent. This first blames any unfinished
|
|
* entries before the chunk (which is where target and parent start
|
|
* differing) on the parent, and then splits blame entries at the
|
|
* start and at the end of the difference region. Since use of -M and
|
|
* -C options may lead to overlapping/duplicate source line number
|
|
* ranges, all we can rely on from sorting/merging is the order of the
|
|
* first suspect line number.
|
|
*/
|
|
static void blame_chunk(struct blame_entry ***dstq, struct blame_entry ***srcq,
|
|
int tlno, int offset, int same,
|
|
struct blame_origin *parent)
|
|
{
|
|
struct blame_entry *e = **srcq;
|
|
struct blame_entry *samep = NULL, *diffp = NULL;
|
|
|
|
while (e && e->s_lno < tlno) {
|
|
struct blame_entry *next = e->next;
|
|
/*
|
|
* current record starts before differing portion. If
|
|
* it reaches into it, we need to split it up and
|
|
* examine the second part separately.
|
|
*/
|
|
if (e->s_lno + e->num_lines > tlno) {
|
|
/* Move second half to a new record */
|
|
int len = tlno - e->s_lno;
|
|
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
|
|
n->suspect = e->suspect;
|
|
n->lno = e->lno + len;
|
|
n->s_lno = e->s_lno + len;
|
|
n->num_lines = e->num_lines - len;
|
|
e->num_lines = len;
|
|
e->score = 0;
|
|
/* Push new record to diffp */
|
|
n->next = diffp;
|
|
diffp = n;
|
|
} else
|
|
blame_origin_decref(e->suspect);
|
|
/* Pass blame for everything before the differing
|
|
* chunk to the parent */
|
|
e->suspect = blame_origin_incref(parent);
|
|
e->s_lno += offset;
|
|
e->next = samep;
|
|
samep = e;
|
|
e = next;
|
|
}
|
|
/*
|
|
* As we don't know how much of a common stretch after this
|
|
* diff will occur, the currently blamed parts are all that we
|
|
* can assign to the parent for now.
|
|
*/
|
|
|
|
if (samep) {
|
|
**dstq = reverse_blame(samep, **dstq);
|
|
*dstq = &samep->next;
|
|
}
|
|
/*
|
|
* Prepend the split off portions: everything after e starts
|
|
* after the blameable portion.
|
|
*/
|
|
e = reverse_blame(diffp, e);
|
|
|
|
/*
|
|
* Now retain records on the target while parts are different
|
|
* from the parent.
|
|
*/
|
|
samep = NULL;
|
|
diffp = NULL;
|
|
while (e && e->s_lno < same) {
|
|
struct blame_entry *next = e->next;
|
|
|
|
/*
|
|
* If current record extends into sameness, need to split.
|
|
*/
|
|
if (e->s_lno + e->num_lines > same) {
|
|
/*
|
|
* Move second half to a new record to be
|
|
* processed by later chunks
|
|
*/
|
|
int len = same - e->s_lno;
|
|
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
|
|
n->suspect = blame_origin_incref(e->suspect);
|
|
n->lno = e->lno + len;
|
|
n->s_lno = e->s_lno + len;
|
|
n->num_lines = e->num_lines - len;
|
|
e->num_lines = len;
|
|
e->score = 0;
|
|
/* Push new record to samep */
|
|
n->next = samep;
|
|
samep = n;
|
|
}
|
|
e->next = diffp;
|
|
diffp = e;
|
|
e = next;
|
|
}
|
|
**srcq = reverse_blame(diffp, reverse_blame(samep, e));
|
|
/* Move across elements that are in the unblamable portion */
|
|
if (diffp)
|
|
*srcq = &diffp->next;
|
|
}
|
|
|
|
struct blame_chunk_cb_data {
|
|
struct blame_origin *parent;
|
|
long offset;
|
|
struct blame_entry **dstq;
|
|
struct blame_entry **srcq;
|
|
};
|
|
|
|
/* diff chunks are from parent to target */
|
|
static int blame_chunk_cb(long start_a, long count_a,
|
|
long start_b, long count_b, void *data)
|
|
{
|
|
struct blame_chunk_cb_data *d = data;
|
|
if (start_a - start_b != d->offset)
|
|
die("internal error in blame::blame_chunk_cb");
|
|
blame_chunk(&d->dstq, &d->srcq, start_b, start_a - start_b,
|
|
start_b + count_b, d->parent);
|
|
d->offset = start_a + count_a - (start_b + count_b);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We are looking at the origin 'target' and aiming to pass blame
|
|
* for the lines it is suspected to its parent. Run diff to find
|
|
* which lines came from parent and pass blame for them.
|
|
*/
|
|
static void pass_blame_to_parent(struct blame_scoreboard *sb,
|
|
struct blame_origin *target,
|
|
struct blame_origin *parent)
|
|
{
|
|
mmfile_t file_p, file_o;
|
|
struct blame_chunk_cb_data d;
|
|
struct blame_entry *newdest = NULL;
|
|
|
|
if (!target->suspects)
|
|
return; /* nothing remains for this target */
|
|
|
|
d.parent = parent;
|
|
d.offset = 0;
|
|
d.dstq = &newdest; d.srcq = &target->suspects;
|
|
|
|
fill_origin_blob(&sb->revs->diffopt, parent, &file_p, &sb->num_read_blob);
|
|
fill_origin_blob(&sb->revs->diffopt, target, &file_o, &sb->num_read_blob);
|
|
sb->num_get_patch++;
|
|
|
|
if (diff_hunks(&file_p, &file_o, blame_chunk_cb, &d, sb->xdl_opts))
|
|
die("unable to generate diff (%s -> %s)",
|
|
oid_to_hex(&parent->commit->object.oid),
|
|
oid_to_hex(&target->commit->object.oid));
|
|
/* The rest are the same as the parent */
|
|
blame_chunk(&d.dstq, &d.srcq, INT_MAX, d.offset, INT_MAX, parent);
|
|
*d.dstq = NULL;
|
|
queue_blames(sb, parent, newdest);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The lines in blame_entry after splitting blames many times can become
|
|
* very small and trivial, and at some point it becomes pointless to
|
|
* blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
|
|
* ordinary C program, and it is not worth to say it was copied from
|
|
* totally unrelated file in the parent.
|
|
*
|
|
* Compute how trivial the lines in the blame_entry are.
|
|
*/
|
|
unsigned blame_entry_score(struct blame_scoreboard *sb, struct blame_entry *e)
|
|
{
|
|
unsigned score;
|
|
const char *cp, *ep;
|
|
|
|
if (e->score)
|
|
return e->score;
|
|
|
|
score = 1;
|
|
cp = blame_nth_line(sb, e->lno);
|
|
ep = blame_nth_line(sb, e->lno + e->num_lines);
|
|
while (cp < ep) {
|
|
unsigned ch = *((unsigned char *)cp);
|
|
if (isalnum(ch))
|
|
score++;
|
|
cp++;
|
|
}
|
|
e->score = score;
|
|
return score;
|
|
}
|
|
|
|
/*
|
|
* best_so_far[] and this[] are both a split of an existing blame_entry
|
|
* that passes blame to the parent. Maintain best_so_far the best split
|
|
* so far, by comparing this and best_so_far and copying this into
|
|
* bst_so_far as needed.
|
|
*/
|
|
static void copy_split_if_better(struct blame_scoreboard *sb,
|
|
struct blame_entry *best_so_far,
|
|
struct blame_entry *this)
|
|
{
|
|
int i;
|
|
|
|
if (!this[1].suspect)
|
|
return;
|
|
if (best_so_far[1].suspect) {
|
|
if (blame_entry_score(sb, &this[1]) < blame_entry_score(sb, &best_so_far[1]))
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < 3; i++)
|
|
blame_origin_incref(this[i].suspect);
|
|
decref_split(best_so_far);
|
|
memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
|
|
}
|
|
|
|
/*
|
|
* We are looking at a part of the final image represented by
|
|
* ent (tlno and same are offset by ent->s_lno).
|
|
* tlno is where we are looking at in the final image.
|
|
* up to (but not including) same match preimage.
|
|
* plno is where we are looking at in the preimage.
|
|
*
|
|
* <-------------- final image ---------------------->
|
|
* <------ent------>
|
|
* ^tlno ^same
|
|
* <---------preimage----->
|
|
* ^plno
|
|
*
|
|
* All line numbers are 0-based.
|
|
*/
|
|
static void handle_split(struct blame_scoreboard *sb,
|
|
struct blame_entry *ent,
|
|
int tlno, int plno, int same,
|
|
struct blame_origin *parent,
|
|
struct blame_entry *split)
|
|
{
|
|
if (ent->num_lines <= tlno)
|
|
return;
|
|
if (tlno < same) {
|
|
struct blame_entry this[3];
|
|
tlno += ent->s_lno;
|
|
same += ent->s_lno;
|
|
split_overlap(this, ent, tlno, plno, same, parent);
|
|
copy_split_if_better(sb, split, this);
|
|
decref_split(this);
|
|
}
|
|
}
|
|
|
|
struct handle_split_cb_data {
|
|
struct blame_scoreboard *sb;
|
|
struct blame_entry *ent;
|
|
struct blame_origin *parent;
|
|
struct blame_entry *split;
|
|
long plno;
|
|
long tlno;
|
|
};
|
|
|
|
static int handle_split_cb(long start_a, long count_a,
|
|
long start_b, long count_b, void *data)
|
|
{
|
|
struct handle_split_cb_data *d = data;
|
|
handle_split(d->sb, d->ent, d->tlno, d->plno, start_b, d->parent,
|
|
d->split);
|
|
d->plno = start_a + count_a;
|
|
d->tlno = start_b + count_b;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the lines from parent that are the same as ent so that
|
|
* we can pass blames to it. file_p has the blob contents for
|
|
* the parent.
|
|
*/
|
|
static void find_copy_in_blob(struct blame_scoreboard *sb,
|
|
struct blame_entry *ent,
|
|
struct blame_origin *parent,
|
|
struct blame_entry *split,
|
|
mmfile_t *file_p)
|
|
{
|
|
const char *cp;
|
|
mmfile_t file_o;
|
|
struct handle_split_cb_data d;
|
|
|
|
memset(&d, 0, sizeof(d));
|
|
d.sb = sb; d.ent = ent; d.parent = parent; d.split = split;
|
|
/*
|
|
* Prepare mmfile that contains only the lines in ent.
|
|
*/
|
|
cp = blame_nth_line(sb, ent->lno);
|
|
file_o.ptr = (char *) cp;
|
|
file_o.size = blame_nth_line(sb, ent->lno + ent->num_lines) - cp;
|
|
|
|
/*
|
|
* file_o is a part of final image we are annotating.
|
|
* file_p partially may match that image.
|
|
*/
|
|
memset(split, 0, sizeof(struct blame_entry [3]));
|
|
if (diff_hunks(file_p, &file_o, handle_split_cb, &d, sb->xdl_opts))
|
|
die("unable to generate diff (%s)",
|
|
oid_to_hex(&parent->commit->object.oid));
|
|
/* remainder, if any, all match the preimage */
|
|
handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split);
|
|
}
|
|
|
|
/* Move all blame entries from list *source that have a score smaller
|
|
* than score_min to the front of list *small.
|
|
* Returns a pointer to the link pointing to the old head of the small list.
|
|
*/
|
|
|
|
static struct blame_entry **filter_small(struct blame_scoreboard *sb,
|
|
struct blame_entry **small,
|
|
struct blame_entry **source,
|
|
unsigned score_min)
|
|
{
|
|
struct blame_entry *p = *source;
|
|
struct blame_entry *oldsmall = *small;
|
|
while (p) {
|
|
if (blame_entry_score(sb, p) <= score_min) {
|
|
*small = p;
|
|
small = &p->next;
|
|
p = *small;
|
|
} else {
|
|
*source = p;
|
|
source = &p->next;
|
|
p = *source;
|
|
}
|
|
}
|
|
*small = oldsmall;
|
|
*source = NULL;
|
|
return small;
|
|
}
|
|
|
|
/*
|
|
* See if lines currently target is suspected for can be attributed to
|
|
* parent.
|
|
*/
|
|
static void find_move_in_parent(struct blame_scoreboard *sb,
|
|
struct blame_entry ***blamed,
|
|
struct blame_entry **toosmall,
|
|
struct blame_origin *target,
|
|
struct blame_origin *parent)
|
|
{
|
|
struct blame_entry *e, split[3];
|
|
struct blame_entry *unblamed = target->suspects;
|
|
struct blame_entry *leftover = NULL;
|
|
mmfile_t file_p;
|
|
|
|
if (!unblamed)
|
|
return; /* nothing remains for this target */
|
|
|
|
fill_origin_blob(&sb->revs->diffopt, parent, &file_p, &sb->num_read_blob);
|
|
if (!file_p.ptr)
|
|
return;
|
|
|
|
/* At each iteration, unblamed has a NULL-terminated list of
|
|
* entries that have not yet been tested for blame. leftover
|
|
* contains the reversed list of entries that have been tested
|
|
* without being assignable to the parent.
|
|
*/
|
|
do {
|
|
struct blame_entry **unblamedtail = &unblamed;
|
|
struct blame_entry *next;
|
|
for (e = unblamed; e; e = next) {
|
|
next = e->next;
|
|
find_copy_in_blob(sb, e, parent, split, &file_p);
|
|
if (split[1].suspect &&
|
|
sb->move_score < blame_entry_score(sb, &split[1])) {
|
|
split_blame(blamed, &unblamedtail, split, e);
|
|
} else {
|
|
e->next = leftover;
|
|
leftover = e;
|
|
}
|
|
decref_split(split);
|
|
}
|
|
*unblamedtail = NULL;
|
|
toosmall = filter_small(sb, toosmall, &unblamed, sb->move_score);
|
|
} while (unblamed);
|
|
target->suspects = reverse_blame(leftover, NULL);
|
|
}
|
|
|
|
struct blame_list {
|
|
struct blame_entry *ent;
|
|
struct blame_entry split[3];
|
|
};
|
|
|
|
/*
|
|
* Count the number of entries the target is suspected for,
|
|
* and prepare a list of entry and the best split.
|
|
*/
|
|
static struct blame_list *setup_blame_list(struct blame_entry *unblamed,
|
|
int *num_ents_p)
|
|
{
|
|
struct blame_entry *e;
|
|
int num_ents, i;
|
|
struct blame_list *blame_list = NULL;
|
|
|
|
for (e = unblamed, num_ents = 0; e; e = e->next)
|
|
num_ents++;
|
|
if (num_ents) {
|
|
blame_list = xcalloc(num_ents, sizeof(struct blame_list));
|
|
for (e = unblamed, i = 0; e; e = e->next)
|
|
blame_list[i++].ent = e;
|
|
}
|
|
*num_ents_p = num_ents;
|
|
return blame_list;
|
|
}
|
|
|
|
/*
|
|
* For lines target is suspected for, see if we can find code movement
|
|
* across file boundary from the parent commit. porigin is the path
|
|
* in the parent we already tried.
|
|
*/
|
|
static void find_copy_in_parent(struct blame_scoreboard *sb,
|
|
struct blame_entry ***blamed,
|
|
struct blame_entry **toosmall,
|
|
struct blame_origin *target,
|
|
struct commit *parent,
|
|
struct blame_origin *porigin,
|
|
int opt)
|
|
{
|
|
struct diff_options diff_opts;
|
|
int i, j;
|
|
struct blame_list *blame_list;
|
|
int num_ents;
|
|
struct blame_entry *unblamed = target->suspects;
|
|
struct blame_entry *leftover = NULL;
|
|
|
|
if (!unblamed)
|
|
return; /* nothing remains for this target */
|
|
|
|
diff_setup(&diff_opts);
|
|
DIFF_OPT_SET(&diff_opts, RECURSIVE);
|
|
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
|
|
diff_setup_done(&diff_opts);
|
|
|
|
/* Try "find copies harder" on new path if requested;
|
|
* we do not want to use diffcore_rename() actually to
|
|
* match things up; find_copies_harder is set only to
|
|
* force diff_tree_oid() to feed all filepairs to diff_queue,
|
|
* and this code needs to be after diff_setup_done(), which
|
|
* usually makes find-copies-harder imply copy detection.
|
|
*/
|
|
if ((opt & PICKAXE_BLAME_COPY_HARDEST)
|
|
|| ((opt & PICKAXE_BLAME_COPY_HARDER)
|
|
&& (!porigin || strcmp(target->path, porigin->path))))
|
|
DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
|
|
|
|
if (is_null_oid(&target->commit->object.oid))
|
|
do_diff_cache(&parent->tree->object.oid, &diff_opts);
|
|
else
|
|
diff_tree_oid(&parent->tree->object.oid,
|
|
&target->commit->tree->object.oid,
|
|
"", &diff_opts);
|
|
|
|
if (!DIFF_OPT_TST(&diff_opts, FIND_COPIES_HARDER))
|
|
diffcore_std(&diff_opts);
|
|
|
|
do {
|
|
struct blame_entry **unblamedtail = &unblamed;
|
|
blame_list = setup_blame_list(unblamed, &num_ents);
|
|
|
|
for (i = 0; i < diff_queued_diff.nr; i++) {
|
|
struct diff_filepair *p = diff_queued_diff.queue[i];
|
|
struct blame_origin *norigin;
|
|
mmfile_t file_p;
|
|
struct blame_entry this[3];
|
|
|
|
if (!DIFF_FILE_VALID(p->one))
|
|
continue; /* does not exist in parent */
|
|
if (S_ISGITLINK(p->one->mode))
|
|
continue; /* ignore git links */
|
|
if (porigin && !strcmp(p->one->path, porigin->path))
|
|
/* find_move already dealt with this path */
|
|
continue;
|
|
|
|
norigin = get_origin(parent, p->one->path);
|
|
oidcpy(&norigin->blob_oid, &p->one->oid);
|
|
norigin->mode = p->one->mode;
|
|
fill_origin_blob(&sb->revs->diffopt, norigin, &file_p, &sb->num_read_blob);
|
|
if (!file_p.ptr)
|
|
continue;
|
|
|
|
for (j = 0; j < num_ents; j++) {
|
|
find_copy_in_blob(sb, blame_list[j].ent,
|
|
norigin, this, &file_p);
|
|
copy_split_if_better(sb, blame_list[j].split,
|
|
this);
|
|
decref_split(this);
|
|
}
|
|
blame_origin_decref(norigin);
|
|
}
|
|
|
|
for (j = 0; j < num_ents; j++) {
|
|
struct blame_entry *split = blame_list[j].split;
|
|
if (split[1].suspect &&
|
|
sb->copy_score < blame_entry_score(sb, &split[1])) {
|
|
split_blame(blamed, &unblamedtail, split,
|
|
blame_list[j].ent);
|
|
} else {
|
|
blame_list[j].ent->next = leftover;
|
|
leftover = blame_list[j].ent;
|
|
}
|
|
decref_split(split);
|
|
}
|
|
free(blame_list);
|
|
*unblamedtail = NULL;
|
|
toosmall = filter_small(sb, toosmall, &unblamed, sb->copy_score);
|
|
} while (unblamed);
|
|
target->suspects = reverse_blame(leftover, NULL);
|
|
diff_flush(&diff_opts);
|
|
clear_pathspec(&diff_opts.pathspec);
|
|
}
|
|
|
|
/*
|
|
* The blobs of origin and porigin exactly match, so everything
|
|
* origin is suspected for can be blamed on the parent.
|
|
*/
|
|
static void pass_whole_blame(struct blame_scoreboard *sb,
|
|
struct blame_origin *origin, struct blame_origin *porigin)
|
|
{
|
|
struct blame_entry *e, *suspects;
|
|
|
|
if (!porigin->file.ptr && origin->file.ptr) {
|
|
/* Steal its file */
|
|
porigin->file = origin->file;
|
|
origin->file.ptr = NULL;
|
|
}
|
|
suspects = origin->suspects;
|
|
origin->suspects = NULL;
|
|
for (e = suspects; e; e = e->next) {
|
|
blame_origin_incref(porigin);
|
|
blame_origin_decref(e->suspect);
|
|
e->suspect = porigin;
|
|
}
|
|
queue_blames(sb, porigin, suspects);
|
|
}
|
|
|
|
/*
|
|
* We pass blame from the current commit to its parents. We keep saying
|
|
* "parent" (and "porigin"), but what we mean is to find scapegoat to
|
|
* exonerate ourselves.
|
|
*/
|
|
static struct commit_list *first_scapegoat(struct rev_info *revs, struct commit *commit,
|
|
int reverse)
|
|
{
|
|
if (!reverse) {
|
|
if (revs->first_parent_only &&
|
|
commit->parents &&
|
|
commit->parents->next) {
|
|
free_commit_list(commit->parents->next);
|
|
commit->parents->next = NULL;
|
|
}
|
|
return commit->parents;
|
|
}
|
|
return lookup_decoration(&revs->children, &commit->object);
|
|
}
|
|
|
|
static int num_scapegoats(struct rev_info *revs, struct commit *commit, int reverse)
|
|
{
|
|
struct commit_list *l = first_scapegoat(revs, commit, reverse);
|
|
return commit_list_count(l);
|
|
}
|
|
|
|
/* Distribute collected unsorted blames to the respected sorted lists
|
|
* in the various origins.
|
|
*/
|
|
static void distribute_blame(struct blame_scoreboard *sb, struct blame_entry *blamed)
|
|
{
|
|
blamed = llist_mergesort(blamed, get_next_blame, set_next_blame,
|
|
compare_blame_suspect);
|
|
while (blamed)
|
|
{
|
|
struct blame_origin *porigin = blamed->suspect;
|
|
struct blame_entry *suspects = NULL;
|
|
do {
|
|
struct blame_entry *next = blamed->next;
|
|
blamed->next = suspects;
|
|
suspects = blamed;
|
|
blamed = next;
|
|
} while (blamed && blamed->suspect == porigin);
|
|
suspects = reverse_blame(suspects, NULL);
|
|
queue_blames(sb, porigin, suspects);
|
|
}
|
|
}
|
|
|
|
#define MAXSG 16
|
|
|
|
static void pass_blame(struct blame_scoreboard *sb, struct blame_origin *origin, int opt)
|
|
{
|
|
struct rev_info *revs = sb->revs;
|
|
int i, pass, num_sg;
|
|
struct commit *commit = origin->commit;
|
|
struct commit_list *sg;
|
|
struct blame_origin *sg_buf[MAXSG];
|
|
struct blame_origin *porigin, **sg_origin = sg_buf;
|
|
struct blame_entry *toosmall = NULL;
|
|
struct blame_entry *blames, **blametail = &blames;
|
|
|
|
num_sg = num_scapegoats(revs, commit, sb->reverse);
|
|
if (!num_sg)
|
|
goto finish;
|
|
else if (num_sg < ARRAY_SIZE(sg_buf))
|
|
memset(sg_buf, 0, sizeof(sg_buf));
|
|
else
|
|
sg_origin = xcalloc(num_sg, sizeof(*sg_origin));
|
|
|
|
/*
|
|
* The first pass looks for unrenamed path to optimize for
|
|
* common cases, then we look for renames in the second pass.
|
|
*/
|
|
for (pass = 0; pass < 2 - sb->no_whole_file_rename; pass++) {
|
|
struct blame_origin *(*find)(struct commit *, struct blame_origin *);
|
|
find = pass ? find_rename : find_origin;
|
|
|
|
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
|
|
i < num_sg && sg;
|
|
sg = sg->next, i++) {
|
|
struct commit *p = sg->item;
|
|
int j, same;
|
|
|
|
if (sg_origin[i])
|
|
continue;
|
|
if (parse_commit(p))
|
|
continue;
|
|
porigin = find(p, origin);
|
|
if (!porigin)
|
|
continue;
|
|
if (!oidcmp(&porigin->blob_oid, &origin->blob_oid)) {
|
|
pass_whole_blame(sb, origin, porigin);
|
|
blame_origin_decref(porigin);
|
|
goto finish;
|
|
}
|
|
for (j = same = 0; j < i; j++)
|
|
if (sg_origin[j] &&
|
|
!oidcmp(&sg_origin[j]->blob_oid, &porigin->blob_oid)) {
|
|
same = 1;
|
|
break;
|
|
}
|
|
if (!same)
|
|
sg_origin[i] = porigin;
|
|
else
|
|
blame_origin_decref(porigin);
|
|
}
|
|
}
|
|
|
|
sb->num_commits++;
|
|
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
|
|
i < num_sg && sg;
|
|
sg = sg->next, i++) {
|
|
struct blame_origin *porigin = sg_origin[i];
|
|
if (!porigin)
|
|
continue;
|
|
if (!origin->previous) {
|
|
blame_origin_incref(porigin);
|
|
origin->previous = porigin;
|
|
}
|
|
pass_blame_to_parent(sb, origin, porigin);
|
|
if (!origin->suspects)
|
|
goto finish;
|
|
}
|
|
|
|
/*
|
|
* Optionally find moves in parents' files.
|
|
*/
|
|
if (opt & PICKAXE_BLAME_MOVE) {
|
|
filter_small(sb, &toosmall, &origin->suspects, sb->move_score);
|
|
if (origin->suspects) {
|
|
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
|
|
i < num_sg && sg;
|
|
sg = sg->next, i++) {
|
|
struct blame_origin *porigin = sg_origin[i];
|
|
if (!porigin)
|
|
continue;
|
|
find_move_in_parent(sb, &blametail, &toosmall, origin, porigin);
|
|
if (!origin->suspects)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Optionally find copies from parents' files.
|
|
*/
|
|
if (opt & PICKAXE_BLAME_COPY) {
|
|
if (sb->copy_score > sb->move_score)
|
|
filter_small(sb, &toosmall, &origin->suspects, sb->copy_score);
|
|
else if (sb->copy_score < sb->move_score) {
|
|
origin->suspects = blame_merge(origin->suspects, toosmall);
|
|
toosmall = NULL;
|
|
filter_small(sb, &toosmall, &origin->suspects, sb->copy_score);
|
|
}
|
|
if (!origin->suspects)
|
|
goto finish;
|
|
|
|
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
|
|
i < num_sg && sg;
|
|
sg = sg->next, i++) {
|
|
struct blame_origin *porigin = sg_origin[i];
|
|
find_copy_in_parent(sb, &blametail, &toosmall,
|
|
origin, sg->item, porigin, opt);
|
|
if (!origin->suspects)
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
finish:
|
|
*blametail = NULL;
|
|
distribute_blame(sb, blames);
|
|
/*
|
|
* prepend toosmall to origin->suspects
|
|
*
|
|
* There is no point in sorting: this ends up on a big
|
|
* unsorted list in the caller anyway.
|
|
*/
|
|
if (toosmall) {
|
|
struct blame_entry **tail = &toosmall;
|
|
while (*tail)
|
|
tail = &(*tail)->next;
|
|
*tail = origin->suspects;
|
|
origin->suspects = toosmall;
|
|
}
|
|
for (i = 0; i < num_sg; i++) {
|
|
if (sg_origin[i]) {
|
|
drop_origin_blob(sg_origin[i]);
|
|
blame_origin_decref(sg_origin[i]);
|
|
}
|
|
}
|
|
drop_origin_blob(origin);
|
|
if (sg_buf != sg_origin)
|
|
free(sg_origin);
|
|
}
|
|
|
|
/*
|
|
* The main loop -- while we have blobs with lines whose true origin
|
|
* is still unknown, pick one blob, and allow its lines to pass blames
|
|
* to its parents. */
|
|
void assign_blame(struct blame_scoreboard *sb, int opt)
|
|
{
|
|
struct rev_info *revs = sb->revs;
|
|
struct commit *commit = prio_queue_get(&sb->commits);
|
|
|
|
while (commit) {
|
|
struct blame_entry *ent;
|
|
struct blame_origin *suspect = commit->util;
|
|
|
|
/* find one suspect to break down */
|
|
while (suspect && !suspect->suspects)
|
|
suspect = suspect->next;
|
|
|
|
if (!suspect) {
|
|
commit = prio_queue_get(&sb->commits);
|
|
continue;
|
|
}
|
|
|
|
assert(commit == suspect->commit);
|
|
|
|
/*
|
|
* We will use this suspect later in the loop,
|
|
* so hold onto it in the meantime.
|
|
*/
|
|
blame_origin_incref(suspect);
|
|
parse_commit(commit);
|
|
if (sb->reverse ||
|
|
(!(commit->object.flags & UNINTERESTING) &&
|
|
!(revs->max_age != -1 && commit->date < revs->max_age)))
|
|
pass_blame(sb, suspect, opt);
|
|
else {
|
|
commit->object.flags |= UNINTERESTING;
|
|
if (commit->object.parsed)
|
|
mark_parents_uninteresting(commit);
|
|
}
|
|
/* treat root commit as boundary */
|
|
if (!commit->parents && !sb->show_root)
|
|
commit->object.flags |= UNINTERESTING;
|
|
|
|
/* Take responsibility for the remaining entries */
|
|
ent = suspect->suspects;
|
|
if (ent) {
|
|
suspect->guilty = 1;
|
|
for (;;) {
|
|
struct blame_entry *next = ent->next;
|
|
if (sb->found_guilty_entry)
|
|
sb->found_guilty_entry(ent, sb->found_guilty_entry_data);
|
|
if (next) {
|
|
ent = next;
|
|
continue;
|
|
}
|
|
ent->next = sb->ent;
|
|
sb->ent = suspect->suspects;
|
|
suspect->suspects = NULL;
|
|
break;
|
|
}
|
|
}
|
|
blame_origin_decref(suspect);
|
|
|
|
if (sb->debug) /* sanity */
|
|
sanity_check_refcnt(sb);
|
|
}
|
|
}
|
|
|
|
static const char *get_next_line(const char *start, const char *end)
|
|
{
|
|
const char *nl = memchr(start, '\n', end - start);
|
|
return nl ? nl + 1 : end;
|
|
}
|
|
|
|
/*
|
|
* To allow quick access to the contents of nth line in the
|
|
* final image, prepare an index in the scoreboard.
|
|
*/
|
|
static int prepare_lines(struct blame_scoreboard *sb)
|
|
{
|
|
const char *buf = sb->final_buf;
|
|
unsigned long len = sb->final_buf_size;
|
|
const char *end = buf + len;
|
|
const char *p;
|
|
int *lineno;
|
|
int num = 0;
|
|
|
|
for (p = buf; p < end; p = get_next_line(p, end))
|
|
num++;
|
|
|
|
ALLOC_ARRAY(sb->lineno, num + 1);
|
|
lineno = sb->lineno;
|
|
|
|
for (p = buf; p < end; p = get_next_line(p, end))
|
|
*lineno++ = p - buf;
|
|
|
|
*lineno = len;
|
|
|
|
sb->num_lines = num;
|
|
return sb->num_lines;
|
|
}
|
|
|
|
static struct commit *find_single_final(struct rev_info *revs,
|
|
const char **name_p)
|
|
{
|
|
int i;
|
|
struct commit *found = NULL;
|
|
const char *name = NULL;
|
|
|
|
for (i = 0; i < revs->pending.nr; i++) {
|
|
struct object *obj = revs->pending.objects[i].item;
|
|
if (obj->flags & UNINTERESTING)
|
|
continue;
|
|
obj = deref_tag(obj, NULL, 0);
|
|
if (obj->type != OBJ_COMMIT)
|
|
die("Non commit %s?", revs->pending.objects[i].name);
|
|
if (found)
|
|
die("More than one commit to dig from %s and %s?",
|
|
revs->pending.objects[i].name, name);
|
|
found = (struct commit *)obj;
|
|
name = revs->pending.objects[i].name;
|
|
}
|
|
if (name_p)
|
|
*name_p = xstrdup_or_null(name);
|
|
return found;
|
|
}
|
|
|
|
static struct commit *dwim_reverse_initial(struct rev_info *revs,
|
|
const char **name_p)
|
|
{
|
|
/*
|
|
* DWIM "git blame --reverse ONE -- PATH" as
|
|
* "git blame --reverse ONE..HEAD -- PATH" but only do so
|
|
* when it makes sense.
|
|
*/
|
|
struct object *obj;
|
|
struct commit *head_commit;
|
|
struct object_id head_oid;
|
|
|
|
if (revs->pending.nr != 1)
|
|
return NULL;
|
|
|
|
/* Is that sole rev a committish? */
|
|
obj = revs->pending.objects[0].item;
|
|
obj = deref_tag(obj, NULL, 0);
|
|
if (obj->type != OBJ_COMMIT)
|
|
return NULL;
|
|
|
|
/* Do we have HEAD? */
|
|
if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL))
|
|
return NULL;
|
|
head_commit = lookup_commit_reference_gently(&head_oid, 1);
|
|
if (!head_commit)
|
|
return NULL;
|
|
|
|
/* Turn "ONE" into "ONE..HEAD" then */
|
|
obj->flags |= UNINTERESTING;
|
|
add_pending_object(revs, &head_commit->object, "HEAD");
|
|
|
|
if (name_p)
|
|
*name_p = revs->pending.objects[0].name;
|
|
return (struct commit *)obj;
|
|
}
|
|
|
|
static struct commit *find_single_initial(struct rev_info *revs,
|
|
const char **name_p)
|
|
{
|
|
int i;
|
|
struct commit *found = NULL;
|
|
const char *name = NULL;
|
|
|
|
/*
|
|
* There must be one and only one negative commit, and it must be
|
|
* the boundary.
|
|
*/
|
|
for (i = 0; i < revs->pending.nr; i++) {
|
|
struct object *obj = revs->pending.objects[i].item;
|
|
if (!(obj->flags & UNINTERESTING))
|
|
continue;
|
|
obj = deref_tag(obj, NULL, 0);
|
|
if (obj->type != OBJ_COMMIT)
|
|
die("Non commit %s?", revs->pending.objects[i].name);
|
|
if (found)
|
|
die("More than one commit to dig up from, %s and %s?",
|
|
revs->pending.objects[i].name, name);
|
|
found = (struct commit *) obj;
|
|
name = revs->pending.objects[i].name;
|
|
}
|
|
|
|
if (!name)
|
|
found = dwim_reverse_initial(revs, &name);
|
|
if (!name)
|
|
die("No commit to dig up from?");
|
|
|
|
if (name_p)
|
|
*name_p = xstrdup(name);
|
|
return found;
|
|
}
|
|
|
|
void init_scoreboard(struct blame_scoreboard *sb)
|
|
{
|
|
memset(sb, 0, sizeof(struct blame_scoreboard));
|
|
sb->move_score = BLAME_DEFAULT_MOVE_SCORE;
|
|
sb->copy_score = BLAME_DEFAULT_COPY_SCORE;
|
|
}
|
|
|
|
void setup_scoreboard(struct blame_scoreboard *sb, const char *path, struct blame_origin **orig)
|
|
{
|
|
const char *final_commit_name = NULL;
|
|
struct blame_origin *o;
|
|
struct commit *final_commit = NULL;
|
|
enum object_type type;
|
|
|
|
if (sb->reverse && sb->contents_from)
|
|
die(_("--contents and --reverse do not blend well."));
|
|
|
|
if (!sb->reverse) {
|
|
sb->final = find_single_final(sb->revs, &final_commit_name);
|
|
sb->commits.compare = compare_commits_by_commit_date;
|
|
} else {
|
|
sb->final = find_single_initial(sb->revs, &final_commit_name);
|
|
sb->commits.compare = compare_commits_by_reverse_commit_date;
|
|
}
|
|
|
|
if (sb->final && sb->contents_from)
|
|
die(_("cannot use --contents with final commit object name"));
|
|
|
|
if (sb->reverse && sb->revs->first_parent_only)
|
|
sb->revs->children.name = NULL;
|
|
|
|
if (!sb->final) {
|
|
/*
|
|
* "--not A B -- path" without anything positive;
|
|
* do not default to HEAD, but use the working tree
|
|
* or "--contents".
|
|
*/
|
|
setup_work_tree();
|
|
sb->final = fake_working_tree_commit(&sb->revs->diffopt,
|
|
path, sb->contents_from);
|
|
add_pending_object(sb->revs, &(sb->final->object), ":");
|
|
}
|
|
|
|
if (sb->reverse && sb->revs->first_parent_only) {
|
|
final_commit = find_single_final(sb->revs, NULL);
|
|
if (!final_commit)
|
|
die(_("--reverse and --first-parent together require specified latest commit"));
|
|
}
|
|
|
|
/*
|
|
* If we have bottom, this will mark the ancestors of the
|
|
* bottom commits we would reach while traversing as
|
|
* uninteresting.
|
|
*/
|
|
if (prepare_revision_walk(sb->revs))
|
|
die(_("revision walk setup failed"));
|
|
|
|
if (sb->reverse && sb->revs->first_parent_only) {
|
|
struct commit *c = final_commit;
|
|
|
|
sb->revs->children.name = "children";
|
|
while (c->parents &&
|
|
oidcmp(&c->object.oid, &sb->final->object.oid)) {
|
|
struct commit_list *l = xcalloc(1, sizeof(*l));
|
|
|
|
l->item = c;
|
|
if (add_decoration(&sb->revs->children,
|
|
&c->parents->item->object, l))
|
|
die("BUG: not unique item in first-parent chain");
|
|
c = c->parents->item;
|
|
}
|
|
|
|
if (oidcmp(&c->object.oid, &sb->final->object.oid))
|
|
die(_("--reverse --first-parent together require range along first-parent chain"));
|
|
}
|
|
|
|
if (is_null_oid(&sb->final->object.oid)) {
|
|
o = sb->final->util;
|
|
sb->final_buf = xmemdupz(o->file.ptr, o->file.size);
|
|
sb->final_buf_size = o->file.size;
|
|
}
|
|
else {
|
|
o = get_origin(sb->final, path);
|
|
if (fill_blob_sha1_and_mode(o))
|
|
die(_("no such path %s in %s"), path, final_commit_name);
|
|
|
|
if (DIFF_OPT_TST(&sb->revs->diffopt, ALLOW_TEXTCONV) &&
|
|
textconv_object(path, o->mode, &o->blob_oid, 1, (char **) &sb->final_buf,
|
|
&sb->final_buf_size))
|
|
;
|
|
else
|
|
sb->final_buf = read_sha1_file(o->blob_oid.hash, &type,
|
|
&sb->final_buf_size);
|
|
|
|
if (!sb->final_buf)
|
|
die(_("cannot read blob %s for path %s"),
|
|
oid_to_hex(&o->blob_oid),
|
|
path);
|
|
}
|
|
sb->num_read_blob++;
|
|
prepare_lines(sb);
|
|
|
|
if (orig)
|
|
*orig = o;
|
|
|
|
free((char *)final_commit_name);
|
|
}
|
|
|
|
|
|
|
|
struct blame_entry *blame_entry_prepend(struct blame_entry *head,
|
|
long start, long end,
|
|
struct blame_origin *o)
|
|
{
|
|
struct blame_entry *new_head = xcalloc(1, sizeof(struct blame_entry));
|
|
new_head->lno = start;
|
|
new_head->num_lines = end - start;
|
|
new_head->suspect = o;
|
|
new_head->s_lno = start;
|
|
new_head->next = head;
|
|
blame_origin_incref(o);
|
|
return new_head;
|
|
}
|