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bisect: refactor sha1_array into a generic sha1 list

This is a generally useful abstraction, so let's let others
make use of it.  The refactoring is more or less a straight
copy; however, functions and struct members have had their
names changed to match string_list, which is the most
similar data structure.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent 114a6a8 commit 902bb3645160cae72fe43b5f7f5289968ac01617 @peff peff committed with gitster May 19, 2011
Showing with 78 additions and 55 deletions.
  1. +2 −0 Makefile
  2. +15 −55 bisect.c
  3. +43 −0 sha1-array.c
  4. +18 −0 sha1-array.h
View
@@ -547,6 +547,7 @@ LIB_H += rerere.h
LIB_H += resolve-undo.h
LIB_H += revision.h
LIB_H += run-command.h
+LIB_H += sha1-array.h
LIB_H += sha1-lookup.h
LIB_H += sideband.h
LIB_H += sigchain.h
@@ -649,6 +650,7 @@ LIB_OBJS += revision.o
LIB_OBJS += run-command.o
LIB_OBJS += server-info.o
LIB_OBJS += setup.o
+LIB_OBJS += sha1-array.o
LIB_OBJS += sha1-lookup.o
LIB_OBJS += sha1_file.o
LIB_OBJS += sha1_name.o
View
@@ -9,13 +9,7 @@
#include "run-command.h"
#include "log-tree.h"
#include "bisect.h"
-
-struct sha1_array {
- unsigned char (*sha1)[20];
- int sha1_nr;
- int sha1_alloc;
- int sorted;
-};
+#include "sha1-array.h"
static struct sha1_array good_revs;
static struct sha1_array skipped_revs;
@@ -425,22 +419,15 @@ static void argv_array_push_sha1(struct argv_array *array,
argv_array_push(array, strbuf_detach(&buf, NULL));
}
-static void sha1_array_push(struct sha1_array *array,
- const unsigned char *sha1)
-{
- ALLOC_GROW(array->sha1, array->sha1_nr + 1, array->sha1_alloc);
- hashcpy(array->sha1[array->sha1_nr++], sha1);
-}
-
static int register_ref(const char *refname, const unsigned char *sha1,
int flags, void *cb_data)
{
if (!strcmp(refname, "bad")) {
current_bad_sha1 = sha1;
} else if (!prefixcmp(refname, "good-")) {
- sha1_array_push(&good_revs, sha1);
+ sha1_array_append(&good_revs, sha1);
} else if (!prefixcmp(refname, "skip-")) {
- sha1_array_push(&skipped_revs, sha1);
+ sha1_array_append(&skipped_revs, sha1);
}
return 0;
@@ -477,41 +464,14 @@ static void read_bisect_paths(struct argv_array *array)
fclose(fp);
}
-static int array_cmp(const void *a, const void *b)
-{
- return hashcmp(a, b);
-}
-
-static void sort_sha1_array(struct sha1_array *array)
-{
- qsort(array->sha1, array->sha1_nr, sizeof(*array->sha1), array_cmp);
-
- array->sorted = 1;
-}
-
-static const unsigned char *sha1_access(size_t index, void *table)
-{
- unsigned char (*array)[20] = table;
- return array[index];
-}
-
-static int lookup_sha1_array(struct sha1_array *array,
- const unsigned char *sha1)
-{
- if (!array->sorted)
- sort_sha1_array(array);
-
- return sha1_pos(sha1, array->sha1, array->sha1_nr, sha1_access);
-}
-
static char *join_sha1_array_hex(struct sha1_array *array, char delim)
{
struct strbuf joined_hexs = STRBUF_INIT;
int i;
- for (i = 0; i < array->sha1_nr; i++) {
+ for (i = 0; i < array->nr; i++) {
strbuf_addstr(&joined_hexs, sha1_to_hex(array->sha1[i]));
- if (i + 1 < array->sha1_nr)
+ if (i + 1 < array->nr)
strbuf_addch(&joined_hexs, delim);
}
@@ -546,13 +506,13 @@ struct commit_list *filter_skipped(struct commit_list *list,
if (count)
*count = 0;
- if (!skipped_revs.sha1_nr)
+ if (!skipped_revs.nr)
return list;
while (list) {
struct commit_list *next = list->next;
list->next = NULL;
- if (0 <= lookup_sha1_array(&skipped_revs,
+ if (0 <= sha1_array_lookup(&skipped_revs,
list->item->object.sha1)) {
if (skipped_first && !*skipped_first)
*skipped_first = 1;
@@ -647,7 +607,7 @@ static struct commit_list *managed_skipped(struct commit_list *list,
*tried = NULL;
- if (!skipped_revs.sha1_nr)
+ if (!skipped_revs.nr)
return list;
list = filter_skipped(list, tried, 0, &count, &skipped_first);
@@ -672,7 +632,7 @@ static void bisect_rev_setup(struct rev_info *revs, const char *prefix,
/* rev_argv.argv[0] will be ignored by setup_revisions */
argv_array_push(&rev_argv, xstrdup("bisect_rev_setup"));
argv_array_push_sha1(&rev_argv, current_bad_sha1, bad_format);
- for (i = 0; i < good_revs.sha1_nr; i++)
+ for (i = 0; i < good_revs.nr; i++)
argv_array_push_sha1(&rev_argv, good_revs.sha1[i],
good_format);
argv_array_push(&rev_argv, xstrdup("--"));
@@ -772,12 +732,12 @@ static struct commit *get_commit_reference(const unsigned char *sha1)
static struct commit **get_bad_and_good_commits(int *rev_nr)
{
- int len = 1 + good_revs.sha1_nr;
+ int len = 1 + good_revs.nr;
struct commit **rev = xmalloc(len * sizeof(*rev));
int i, n = 0;
rev[n++] = get_commit_reference(current_bad_sha1);
- for (i = 0; i < good_revs.sha1_nr; i++)
+ for (i = 0; i < good_revs.nr; i++)
rev[n++] = get_commit_reference(good_revs.sha1[i]);
*rev_nr = n;
@@ -840,9 +800,9 @@ static void check_merge_bases(void)
const unsigned char *mb = result->item->object.sha1;
if (!hashcmp(mb, current_bad_sha1)) {
handle_bad_merge_base();
- } else if (0 <= lookup_sha1_array(&good_revs, mb)) {
+ } else if (0 <= sha1_array_lookup(&good_revs, mb)) {
continue;
- } else if (0 <= lookup_sha1_array(&skipped_revs, mb)) {
+ } else if (0 <= sha1_array_lookup(&skipped_revs, mb)) {
handle_skipped_merge_base(mb);
} else {
printf("Bisecting: a merge base must be tested\n");
@@ -903,7 +863,7 @@ static void check_good_are_ancestors_of_bad(const char *prefix)
return;
/* Bisecting with no good rev is ok. */
- if (good_revs.sha1_nr == 0)
+ if (good_revs.nr == 0)
return;
/* Check if all good revs are ancestor of the bad rev. */
@@ -968,7 +928,7 @@ int bisect_next_all(const char *prefix)
bisect_common(&revs);
revs.commits = find_bisection(revs.commits, &reaches, &all,
- !!skipped_revs.sha1_nr);
+ !!skipped_revs.nr);
revs.commits = managed_skipped(revs.commits, &tried);
if (!revs.commits) {
View
@@ -0,0 +1,43 @@
+#include "cache.h"
+#include "sha1-array.h"
+#include "sha1-lookup.h"
+
+void sha1_array_append(struct sha1_array *array, const unsigned char *sha1)
+{
+ ALLOC_GROW(array->sha1, array->nr + 1, array->alloc);
+ hashcpy(array->sha1[array->nr++], sha1);
+ array->sorted = 0;
+}
+
+static int void_hashcmp(const void *a, const void *b)
+{
+ return hashcmp(a, b);
+}
+
+void sha1_array_sort(struct sha1_array *array)
+{
+ qsort(array->sha1, array->nr, sizeof(*array->sha1), void_hashcmp);
+ array->sorted = 1;
+}
+
+static const unsigned char *sha1_access(size_t index, void *table)
+{
+ unsigned char (*array)[20] = table;
+ return array[index];
+}
+
+int sha1_array_lookup(struct sha1_array *array, const unsigned char *sha1)
+{
+ if (!array->sorted)
+ sha1_array_sort(array);
+ return sha1_pos(sha1, array->sha1, array->nr, sha1_access);
+}
+
+void sha1_array_clear(struct sha1_array *array)
+{
+ free(array->sha1);
+ array->sha1 = NULL;
+ array->nr = 0;
+ array->alloc = 0;
+ array->sorted = 0;
+}
View
@@ -0,0 +1,18 @@
+#ifndef SHA1_ARRAY_H
+#define SHA1_ARRAY_H
+
+struct sha1_array {
+ unsigned char (*sha1)[20];
+ int nr;
+ int alloc;
+ int sorted;
+};
+
+#define SHA1_ARRAY_INIT { NULL, 0, 0, 0 }
+
+void sha1_array_append(struct sha1_array *array, const unsigned char *sha1);
+void sha1_array_sort(struct sha1_array *array);
+int sha1_array_lookup(struct sha1_array *array, const unsigned char *sha1);
+void sha1_array_clear(struct sha1_array *array);
+
+#endif /* SHA1_ARRAY_H */

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