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3c39e9bdeb
When dealing with an insanely large Octopus, it is possible to optimize by noticing that more than one parents have the same blob and avoid running diff between a parent and the merge result by reusing an earlier result. Signed-off-by: Junio C Hamano <junkio@cox.net>
724 lines
16 KiB
C
724 lines
16 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "quote.h"
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static int uninteresting(struct diff_filepair *p)
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{
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if (diff_unmodified_pair(p))
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return 1;
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if (!S_ISREG(p->one->mode) || !S_ISREG(p->two->mode))
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return 1;
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return 0;
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}
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static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
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{
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struct diff_queue_struct *q = &diff_queued_diff;
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struct combine_diff_path *p;
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int i;
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if (!n) {
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struct combine_diff_path *list = NULL, **tail = &list;
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for (i = 0; i < q->nr; i++) {
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int len;
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const char *path;
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if (uninteresting(q->queue[i]))
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continue;
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path = q->queue[i]->two->path;
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len = strlen(path);
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p = xmalloc(sizeof(*p) + len + 1 + num_parent * 20);
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p->path = (char*) &(p->parent_sha1[num_parent][0]);
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memcpy(p->path, path, len);
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p->path[len] = 0;
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p->len = len;
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p->next = NULL;
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memcpy(p->sha1, q->queue[i]->two->sha1, 20);
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memcpy(p->parent_sha1[n], q->queue[i]->one->sha1, 20);
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*tail = p;
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tail = &p->next;
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}
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return list;
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}
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for (p = curr; p; p = p->next) {
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int found = 0;
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if (!p->len)
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continue;
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for (i = 0; i < q->nr; i++) {
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const char *path;
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int len;
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if (uninteresting(q->queue[i]))
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continue;
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path = q->queue[i]->two->path;
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len = strlen(path);
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if (len == p->len && !memcmp(path, p->path, len)) {
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found = 1;
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memcpy(p->parent_sha1[n],
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q->queue[i]->one->sha1, 20);
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break;
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}
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}
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if (!found)
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p->len = 0;
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}
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return curr;
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}
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struct lline {
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struct lline *next;
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int len;
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unsigned long parent_map;
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char line[FLEX_ARRAY];
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};
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struct sline {
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struct lline *lost_head, **lost_tail;
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char *bol;
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int len;
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unsigned long flag;
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};
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static char *grab_blob(const unsigned char *sha1, unsigned long *size)
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{
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char *blob;
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char type[20];
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if (!memcmp(sha1, null_sha1, 20)) {
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/* deleted blob */
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*size = 0;
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return xcalloc(1, 1);
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}
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blob = read_sha1_file(sha1, type, size);
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if (strcmp(type, "blob"))
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die("object '%s' is not a blob!", sha1_to_hex(sha1));
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return blob;
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}
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#define TMPPATHLEN 50
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#define MAXLINELEN 10240
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static void write_to_temp_file(char *tmpfile, void *blob, unsigned long size)
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{
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int fd = git_mkstemp(tmpfile, TMPPATHLEN, ".diff_XXXXXX");
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if (fd < 0)
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die("unable to create temp-file");
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if (write(fd, blob, size) != size)
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die("unable to write temp-file");
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close(fd);
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}
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static void write_temp_blob(char *tmpfile, const unsigned char *sha1)
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{
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unsigned long size;
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void *blob;
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blob = grab_blob(sha1, &size);
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write_to_temp_file(tmpfile, blob, size);
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free(blob);
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}
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static int parse_num(char **cp_p, unsigned int *num_p)
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{
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char *cp = *cp_p;
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unsigned int num = 0;
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int read_some;
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while ('0' <= *cp && *cp <= '9')
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num = num * 10 + *cp++ - '0';
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if (!(read_some = cp - *cp_p))
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return -1;
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*cp_p = cp;
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*num_p = num;
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return 0;
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}
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static int parse_hunk_header(char *line, int len,
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unsigned int *ob, unsigned int *on,
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unsigned int *nb, unsigned int *nn)
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{
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char *cp;
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cp = line + 4;
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if (parse_num(&cp, ob)) {
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bad_line:
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return error("malformed diff output: %s", line);
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}
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, on))
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goto bad_line;
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}
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else
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*on = 1;
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if (*cp++ != ' ' || *cp++ != '+')
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goto bad_line;
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if (parse_num(&cp, nb))
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goto bad_line;
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, nn))
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goto bad_line;
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}
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else
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*nn = 1;
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return -!!memcmp(cp, " @@", 3);
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}
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static void append_lost(struct sline *sline, int n, const char *line)
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{
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struct lline *lline;
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int len = strlen(line);
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unsigned long this_mask = (1UL<<n);
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if (line[len-1] == '\n')
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len--;
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/* Check to see if we can squash things */
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if (sline->lost_head) {
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struct lline *last_one = NULL;
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/* We cannot squash it with earlier one */
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for (lline = sline->lost_head;
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lline;
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lline = lline->next)
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if (lline->parent_map & this_mask)
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last_one = lline;
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lline = last_one ? last_one->next : sline->lost_head;
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while (lline) {
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if (lline->len == len &&
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!memcmp(lline->line, line, len)) {
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lline->parent_map |= this_mask;
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return;
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}
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lline = lline->next;
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}
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}
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lline = xmalloc(sizeof(*lline) + len + 1);
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lline->len = len;
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lline->next = NULL;
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lline->parent_map = this_mask;
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memcpy(lline->line, line, len);
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lline->line[len] = 0;
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*sline->lost_tail = lline;
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sline->lost_tail = &lline->next;
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}
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static void combine_diff(const unsigned char *parent, const char *ourtmp,
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struct sline *sline, int cnt, int n)
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{
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FILE *in;
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char parent_tmp[TMPPATHLEN];
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char cmd[TMPPATHLEN * 2 + 1024];
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char line[MAXLINELEN];
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unsigned int lno, ob, on, nb, nn;
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unsigned long pmask = ~(1UL << n);
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struct sline *lost_bucket = NULL;
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write_temp_blob(parent_tmp, parent);
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sprintf(cmd, "diff --unified=0 -La/x -Lb/x '%s' '%s'",
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parent_tmp, ourtmp);
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in = popen(cmd, "r");
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if (!in)
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return;
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lno = 1;
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while (fgets(line, sizeof(line), in) != NULL) {
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int len = strlen(line);
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if (5 < len && !memcmp("@@ -", line, 4)) {
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if (parse_hunk_header(line, len,
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&ob, &on, &nb, &nn))
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break;
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lno = nb;
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if (!nb) {
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/* @@ -1,2 +0,0 @@ to remove the
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* first two lines...
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*/
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nb = 1;
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}
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lost_bucket = &sline[nb-1]; /* sline is 0 based */
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continue;
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}
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if (!lost_bucket)
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continue;
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switch (line[0]) {
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case '-':
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append_lost(lost_bucket, n, line+1);
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break;
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case '+':
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sline[lno-1].flag &= pmask;
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lno++;
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break;
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}
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}
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fclose(in);
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unlink(parent_tmp);
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}
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static unsigned long context = 3;
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static char combine_marker = '@';
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static int interesting(struct sline *sline, unsigned long all_mask)
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{
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return ((sline->flag & all_mask) != all_mask || sline->lost_head);
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}
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static unsigned long line_common_diff(struct sline *sline, unsigned long all_mask)
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{
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/*
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* Look at the line and see from which parents we have the
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* same difference.
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*/
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/* Lower bits of sline->flag records if the parent had this
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* line, so XOR with all_mask gives us on-bits for parents we
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* have differences with.
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*/
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unsigned long common_adds = (sline->flag ^ all_mask) & all_mask;
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unsigned long common_removes = all_mask;
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/* If all the parents have this line, that also counts as
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* having the same difference.
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*/
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if (!common_adds)
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common_adds = all_mask;
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if (sline->lost_head) {
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/* Lost head list records the lines removed from
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* the parents, and parent_map records from which
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* parent the line was removed.
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*/
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struct lline *ll;
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for (ll = sline->lost_head; ll; ll = ll->next) {
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common_removes &= ll->parent_map;
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}
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}
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return common_adds & common_removes;
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}
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static unsigned long line_all_diff(struct sline *sline, unsigned long all_mask)
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{
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/*
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* Look at the line and see from which parents we have some difference.
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*/
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unsigned long different = (sline->flag ^ all_mask) & all_mask;
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if (sline->lost_head) {
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/* Lost head list records the lines removed from
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* the parents, and parent_map records from which
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* parent the line was removed.
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*/
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struct lline *ll;
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for (ll = sline->lost_head; ll; ll = ll->next) {
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different |= ll->parent_map;
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}
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}
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return different;
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}
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static unsigned long adjust_hunk_tail(struct sline *sline,
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unsigned long all_mask,
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unsigned long hunk_begin,
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unsigned long i)
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{
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/* i points at the first uninteresting line.
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* If the last line of the hunk was interesting
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* only because it has some deletion, then
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* it is not all that interesting for the
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* purpose of giving trailing context lines.
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*/
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if ((hunk_begin + 1 <= i) &&
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((sline[i-1].flag & all_mask) == all_mask))
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i--;
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return i;
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}
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static unsigned long next_interesting(struct sline *sline,
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unsigned long mark,
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unsigned long i,
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unsigned long cnt,
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int uninteresting)
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{
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while (i < cnt)
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if (uninteresting ?
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!(sline[i].flag & mark) :
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(sline[i].flag & mark))
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return i;
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else
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i++;
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return cnt;
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}
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static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
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{
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unsigned long all_mask = (1UL<<num_parent) - 1;
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unsigned long mark = (1UL<<num_parent);
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unsigned long i;
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i = next_interesting(sline, mark, 0, cnt, 0);
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if (cnt <= i)
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return 0;
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while (i < cnt) {
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unsigned long j = (context < i) ? (i - context) : 0;
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unsigned long k;
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while (j < i)
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sline[j++].flag |= mark;
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again:
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j = next_interesting(sline, mark, i, cnt, 1);
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if (cnt <= j)
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break; /* the rest are all interesting */
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/* lookahead context lines */
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k = next_interesting(sline, mark, j, cnt, 0);
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j = adjust_hunk_tail(sline, all_mask, i, j);
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if (k < j + context) {
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/* k is interesting and [j,k) are not, but
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* paint them interesting because the gap is small.
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*/
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while (j < k)
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sline[j++].flag |= mark;
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i = k;
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goto again;
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}
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/* j is the first uninteresting line and there is
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* no overlap beyond it within context lines.
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*/
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i = k;
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k = (j + context < cnt) ? j + context : cnt;
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while (j < k)
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sline[j++].flag |= mark;
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}
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return 1;
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}
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static int make_hunks(struct sline *sline, unsigned long cnt,
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int num_parent, int dense)
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{
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unsigned long all_mask = (1UL<<num_parent) - 1;
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unsigned long mark = (1UL<<num_parent);
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unsigned long i;
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int has_interesting = 0;
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for (i = 0; i < cnt; i++) {
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if (interesting(&sline[i], all_mask))
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sline[i].flag |= mark;
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else
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sline[i].flag &= ~mark;
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}
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if (!dense)
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return give_context(sline, cnt, num_parent);
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/* Look at each hunk, and if we have changes from only one
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* parent, or the changes are the same from all but one
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* parent, mark that uninteresting.
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*/
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i = 0;
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while (i < cnt) {
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unsigned long j, hunk_begin, hunk_end;
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int same, diff;
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unsigned long same_diff, all_diff;
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while (i < cnt && !(sline[i].flag & mark))
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i++;
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if (cnt <= i)
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break; /* No more interesting hunks */
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hunk_begin = i;
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for (j = i + 1; j < cnt; j++) {
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if (!(sline[j].flag & mark)) {
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/* Look beyond the end to see if there
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* is an interesting line after this
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* hunk within context span.
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*/
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unsigned long la; /* lookahead */
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int contin = 0;
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la = adjust_hunk_tail(sline, all_mask,
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hunk_begin, j);
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la = (la + context < cnt) ?
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(la + context) : cnt;
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while (j <= --la) {
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if (sline[la].flag & mark) {
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contin = 1;
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break;
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}
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}
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if (!contin)
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break;
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j = la;
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}
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}
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hunk_end = j;
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/* [i..hunk_end) are interesting. Now does it have
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* the same change with all but one parent?
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*/
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same_diff = all_mask;
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all_diff = 0;
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for (j = i; j < hunk_end; j++) {
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same_diff &= line_common_diff(sline + j, all_mask);
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all_diff |= line_all_diff(sline + j, all_mask);
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}
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diff = same = 0;
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for (j = 0; j < num_parent; j++) {
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if (same_diff & (1UL<<j))
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same++;
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if (all_diff & (1UL<<j))
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diff++;
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}
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if ((num_parent - 1 <= same) || (diff == 1)) {
|
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/* This hunk is not that interesting after all */
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for (j = hunk_begin; j < hunk_end; j++)
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sline[j].flag &= ~mark;
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}
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i = hunk_end;
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}
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has_interesting = give_context(sline, cnt, num_parent);
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return has_interesting;
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}
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|
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static void dump_sline(struct sline *sline, int cnt, int num_parent)
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{
|
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unsigned long mark = (1UL<<num_parent);
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int i;
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int lno = 0;
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|
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while (1) {
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struct sline *sl = &sline[lno];
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int hunk_end;
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while (lno < cnt && !(sline[lno].flag & mark))
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lno++;
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if (cnt <= lno)
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break;
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for (hunk_end = lno + 1; hunk_end < cnt; hunk_end++)
|
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if (!(sline[hunk_end].flag & mark))
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break;
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for (i = 0; i <= num_parent; i++) putchar(combine_marker);
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printf(" +%d,%d ", lno+1, hunk_end-lno);
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for (i = 0; i <= num_parent; i++) putchar(combine_marker);
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putchar('\n');
|
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while (lno < hunk_end) {
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struct lline *ll;
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int j;
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sl = &sline[lno++];
|
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ll = sl->lost_head;
|
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while (ll) {
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for (j = 0; j < num_parent; j++) {
|
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if (ll->parent_map & (1UL<<j))
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putchar('-');
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else
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putchar(' ');
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}
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puts(ll->line);
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ll = ll->next;
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}
|
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for (j = 0; j < num_parent; j++) {
|
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if ((1UL<<j) & sl->flag)
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putchar(' ');
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else
|
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putchar('+');
|
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}
|
|
printf("%.*s\n", sl->len, sl->bol);
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}
|
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}
|
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}
|
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|
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static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
|
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int i, int j)
|
|
{
|
|
/* We have already examined parent j and we know parent i
|
|
* and parent j are the same, so reuse the combined result
|
|
* of parent j for parent i.
|
|
*/
|
|
unsigned long lno, imask, jmask;
|
|
imask = (1UL<<i);
|
|
jmask = (1UL<<j);
|
|
|
|
for (lno = 0; lno < cnt; lno++) {
|
|
struct lline *ll = sline->lost_head;
|
|
while (ll) {
|
|
if (ll->parent_map & jmask)
|
|
ll->parent_map |= imask;
|
|
ll = ll->next;
|
|
}
|
|
if (!(sline->flag & jmask))
|
|
sline->flag &= ~imask;
|
|
sline++;
|
|
}
|
|
}
|
|
|
|
int show_combined_diff(struct combine_diff_path *elem, int num_parent,
|
|
int dense, const char *header, int show_empty)
|
|
{
|
|
unsigned long size, cnt, lno;
|
|
char *result, *cp, *ep;
|
|
struct sline *sline; /* survived lines */
|
|
int i, show_hunks, shown_header = 0;
|
|
char ourtmp_buf[TMPPATHLEN];
|
|
char *ourtmp = ourtmp_buf;
|
|
|
|
/* Read the result of merge first */
|
|
if (memcmp(elem->sha1, null_sha1, 20)) {
|
|
result = grab_blob(elem->sha1, &size);
|
|
write_to_temp_file(ourtmp, result, size);
|
|
}
|
|
else {
|
|
struct stat st;
|
|
int fd;
|
|
ourtmp = elem->path;
|
|
if (0 <= (fd = open(ourtmp, O_RDONLY)) &&
|
|
!fstat(fd, &st)) {
|
|
int len = st.st_size;
|
|
int cnt = 0;
|
|
|
|
size = len;
|
|
result = xmalloc(len + 1);
|
|
while (cnt < len) {
|
|
int done = xread(fd, result+cnt, len-cnt);
|
|
if (done == 0)
|
|
break;
|
|
if (done < 0)
|
|
die("read error '%s'", ourtmp);
|
|
cnt += done;
|
|
}
|
|
result[len] = 0;
|
|
}
|
|
else {
|
|
/* deleted file */
|
|
size = 0;
|
|
result = xmalloc(1);
|
|
result[0] = 0;
|
|
ourtmp = "/dev/null";
|
|
}
|
|
if (0 <= fd)
|
|
close(fd);
|
|
}
|
|
|
|
for (cnt = 0, cp = result; cp - result < size; cp++) {
|
|
if (*cp == '\n')
|
|
cnt++;
|
|
}
|
|
if (result[size-1] != '\n')
|
|
cnt++; /* incomplete line */
|
|
|
|
sline = xcalloc(cnt, sizeof(*sline));
|
|
ep = result;
|
|
sline[0].bol = result;
|
|
for (lno = 0, cp = result; cp - result < size; cp++) {
|
|
if (*cp == '\n') {
|
|
sline[lno].lost_tail = &sline[lno].lost_head;
|
|
sline[lno].len = cp - sline[lno].bol;
|
|
sline[lno].flag = (1UL<<num_parent) - 1;
|
|
lno++;
|
|
if (lno < cnt)
|
|
sline[lno].bol = cp + 1;
|
|
}
|
|
}
|
|
if (result[size-1] != '\n') {
|
|
sline[cnt-1].lost_tail = &sline[cnt-1].lost_head;
|
|
sline[cnt-1].len = size - (sline[cnt-1].bol - result);
|
|
sline[cnt-1].flag = (1UL<<num_parent) - 1;
|
|
}
|
|
|
|
for (i = 0; i < num_parent; i++) {
|
|
int j;
|
|
for (j = 0; j < i; j++) {
|
|
if (!memcmp(elem->parent_sha1[i],
|
|
elem->parent_sha1[j], 20)) {
|
|
reuse_combine_diff(sline, cnt, i, j);
|
|
break;
|
|
}
|
|
}
|
|
if (i <= j)
|
|
combine_diff(elem->parent_sha1[i], ourtmp, sline,
|
|
cnt, i);
|
|
}
|
|
|
|
show_hunks = make_hunks(sline, cnt, num_parent, dense);
|
|
|
|
if (header && (show_hunks || show_empty)) {
|
|
shown_header++;
|
|
puts(header);
|
|
}
|
|
if (show_hunks) {
|
|
printf("diff --%s ", dense ? "cc" : "combined");
|
|
if (quote_c_style(elem->path, NULL, NULL, 0))
|
|
quote_c_style(elem->path, NULL, stdout, 0);
|
|
else
|
|
printf("%s", elem->path);
|
|
putchar('\n');
|
|
dump_sline(sline, cnt, num_parent);
|
|
}
|
|
if (ourtmp == ourtmp_buf)
|
|
unlink(ourtmp);
|
|
free(result);
|
|
|
|
for (i = 0; i < cnt; i++) {
|
|
if (sline[i].lost_head) {
|
|
struct lline *ll = sline[i].lost_head;
|
|
while (ll) {
|
|
struct lline *tmp = ll;
|
|
ll = ll->next;
|
|
free(tmp);
|
|
}
|
|
}
|
|
}
|
|
free(sline);
|
|
return shown_header;
|
|
}
|
|
|
|
int diff_tree_combined_merge(const unsigned char *sha1,
|
|
const char *header,
|
|
int show_empty_merge, int dense)
|
|
{
|
|
struct commit *commit = lookup_commit(sha1);
|
|
struct diff_options diffopts;
|
|
struct commit_list *parents;
|
|
struct combine_diff_path *p, *paths = NULL;
|
|
int num_parent, i, num_paths;
|
|
|
|
diff_setup(&diffopts);
|
|
diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
diffopts.recursive = 1;
|
|
|
|
/* count parents */
|
|
for (parents = commit->parents, num_parent = 0;
|
|
parents;
|
|
parents = parents->next, num_parent++)
|
|
; /* nothing */
|
|
|
|
/* find set of paths that everybody touches */
|
|
for (parents = commit->parents, i = 0;
|
|
parents;
|
|
parents = parents->next, i++) {
|
|
struct commit *parent = parents->item;
|
|
diff_tree_sha1(parent->object.sha1, commit->object.sha1, "",
|
|
&diffopts);
|
|
paths = intersect_paths(paths, i, num_parent);
|
|
diff_flush(&diffopts);
|
|
}
|
|
|
|
/* find out surviving paths */
|
|
for (num_paths = 0, p = paths; p; p = p->next) {
|
|
if (p->len)
|
|
num_paths++;
|
|
}
|
|
if (num_paths || show_empty_merge) {
|
|
for (p = paths; p; p = p->next) {
|
|
if (!p->len)
|
|
continue;
|
|
if (show_combined_diff(p, num_parent, dense, header,
|
|
show_empty_merge))
|
|
header = NULL;
|
|
}
|
|
}
|
|
|
|
/* Clean things up */
|
|
while (paths) {
|
|
struct combine_diff_path *tmp = paths;
|
|
paths = paths->next;
|
|
free(tmp);
|
|
}
|
|
return 0;
|
|
}
|