X-Git-Url: https://git.octo.it/?p=git.git;a=blobdiff_plain;f=object.c;h=0f70890a4582fec845fb9399b3dc9f388c6538fc;hp=c1f22910a2e207997fbc627ee8150a81b813c3b0;hb=HEAD;hpb=13019d413647c4fbd3bb1564bbdf0d934c0a74d7

diff --git a/object.c b/object.c
index c1f22910..0f70890a 100644
--- a/object.c
+++ b/object.c
@@ -1,38 +1,46 @@
+#include "cache.h"
 #include "object.h"
 #include "blob.h"
 #include "tree.h"
 #include "commit.h"
-#include "cache.h"
 #include "tag.h"
-#include <stdlib.h>
-#include <string.h>
 
 struct object **objs;
-int nr_objs;
-static int obj_allocs;
+static int nr_objs;
+int obj_allocs;
+
+const char *type_names[] = {
+	"none", "blob", "tree", "commit", "bad"
+};
+
+int track_object_refs = 0;
 
-static int find_object(unsigned char *sha1)
+static int hashtable_index(const unsigned char *sha1)
 {
-	int first = 0, last = nr_objs;
-
-        while (first < last) {
-                int next = (first + last) / 2;
-                struct object *obj = objs[next];
-                int cmp;
-
-                cmp = memcmp(sha1, obj->sha1, 20);
-                if (!cmp)
-                        return next;
-                if (cmp < 0) {
-                        last = next;
-                        continue;
-                }
-                first = next+1;
-        }
-        return -first-1;
+	unsigned int i;
+	memcpy(&i, sha1, sizeof(unsigned int));
+	return (int)(i % obj_allocs);
 }
 
-struct object *lookup_object(unsigned char *sha1)
+static int find_object(const unsigned char *sha1)
+{
+	int i;
+
+	if (!objs)
+		return -1;
+
+	i = hashtable_index(sha1);
+	while (objs[i]) {
+		if (memcmp(sha1, objs[i]->sha1, 20) == 0)
+			return i;
+		i++;
+		if (i == obj_allocs)
+			i = 0;
+	}
+	return -1 - i;
+}
+
+struct object *lookup_object(const unsigned char *sha1)
 {
 	int pos = find_object(sha1);
 	if (pos >= 0)
@@ -40,98 +48,225 @@ struct object *lookup_object(unsigned char *sha1)
 	return NULL;
 }
 
-void created_object(unsigned char *sha1, struct object *obj)
+void created_object(const unsigned char *sha1, struct object *obj)
 {
-	int pos = find_object(sha1);
+	int pos;
 
 	obj->parsed = 0;
 	memcpy(obj->sha1, sha1, 20);
-	obj->type = NULL;
+	obj->type = TYPE_NONE;
 	obj->refs = NULL;
 	obj->used = 0;
 
-	if (pos >= 0)
-		die("Inserting %s twice\n", sha1_to_hex(sha1));
-	pos = -pos-1;
-
-	if (obj_allocs == nr_objs) {
-		obj_allocs = alloc_nr(obj_allocs);
+	if (obj_allocs - 1 <= nr_objs * 2) {
+		int i, count = obj_allocs;
+		obj_allocs = (obj_allocs < 32 ? 32 : 2 * obj_allocs);
 		objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
+		memset(objs + count, 0, (obj_allocs - count)
+				* sizeof(struct object *));
+		for (i = 0; i < obj_allocs; i++)
+			if (objs[i]) {
+				int j = find_object(objs[i]->sha1);
+				if (j != i) {
+					j = -1 - j;
+					objs[j] = objs[i];
+					objs[i] = NULL;
+				}
+			}
 	}
 
-	/* Insert it into the right place */
-	memmove(objs + pos + 1, objs + pos, (nr_objs - pos) * 
-		sizeof(struct object *));
+	pos = find_object(sha1);
+	if (pos >= 0)
+		die("Inserting %s twice\n", sha1_to_hex(sha1));
+	pos = -pos-1;
 
 	objs[pos] = obj;
 	nr_objs++;
 }
 
-void add_ref(struct object *refer, struct object *target)
+struct object_refs *alloc_object_refs(unsigned count)
+{
+	struct object_refs *refs;
+	size_t size = sizeof(*refs) + count*sizeof(struct object *);
+
+	refs = xcalloc(1, size);
+	refs->count = count;
+	return refs;
+}
+
+static int compare_object_pointers(const void *a, const void *b)
 {
-	struct object_list **pp = &refer->refs;
-	struct object_list *p;
-	
-	while ((p = *pp) != NULL) {
-		if (p->item == target)
-			return;
-		pp = &p->next;
+	const struct object * const *pa = a;
+	const struct object * const *pb = b;
+	if (*pa == *pb)
+		return 0;
+	else if (*pa < *pb)
+		return -1;
+	else
+		return 1;
+}
+
+void set_object_refs(struct object *obj, struct object_refs *refs)
+{
+	unsigned int i, j;
+
+	/* Do not install empty list of references */
+	if (refs->count < 1) {
+		free(refs);
+		return;
 	}
 
-	target->used = 1;
-	p = xmalloc(sizeof(*p));
-	p->item = target;
-	p->next = NULL;
-	*pp = p;
+	/* Sort the list and filter out duplicates */
+	qsort(refs->ref, refs->count, sizeof(refs->ref[0]),
+	      compare_object_pointers);
+	for (i = j = 1; i < refs->count; i++) {
+		if (refs->ref[i] != refs->ref[i - 1])
+			refs->ref[j++] = refs->ref[i];
+	}
+	if (j < refs->count) {
+		/* Duplicates were found - reallocate list */
+		size_t size = sizeof(*refs) + j*sizeof(struct object *);
+		refs->count = j;
+		refs = xrealloc(refs, size);
+	}
+
+	for (i = 0; i < refs->count; i++)
+		refs->ref[i]->used = 1;
+	obj->refs = refs;
 }
 
 void mark_reachable(struct object *obj, unsigned int mask)
 {
-	struct object_list *p = obj->refs;
-
+	if (!track_object_refs)
+		die("cannot do reachability with object refs turned off");
 	/* If we've been here already, don't bother */
 	if (obj->flags & mask)
 		return;
 	obj->flags |= mask;
-	while (p) {
-		mark_reachable(p->item, mask);
-		p = p->next;
+	if (obj->refs) {
+		const struct object_refs *refs = obj->refs;
+		unsigned i;
+		for (i = 0; i < refs->count; i++)
+			mark_reachable(refs->ref[i], mask);
+	}
+}
+
+struct object *lookup_object_type(const unsigned char *sha1, const char *type)
+{
+	if (!type) {
+		return lookup_unknown_object(sha1);
+	} else if (!strcmp(type, blob_type)) {
+		return &lookup_blob(sha1)->object;
+	} else if (!strcmp(type, tree_type)) {
+		return &lookup_tree(sha1)->object;
+	} else if (!strcmp(type, commit_type)) {
+		return &lookup_commit(sha1)->object;
+	} else if (!strcmp(type, tag_type)) {
+		return &lookup_tag(sha1)->object;
+	} else {
+		error("Unknown type %s", type);
+		return NULL;
+	}
+}
+
+union any_object {
+	struct object object;
+	struct commit commit;
+	struct tree tree;
+	struct blob blob;
+	struct tag tag;
+};
+
+struct object *lookup_unknown_object(const unsigned char *sha1)
+{
+	struct object *obj = lookup_object(sha1);
+	if (!obj) {
+		union any_object *ret = xcalloc(1, sizeof(*ret));
+		created_object(sha1, &ret->object);
+		ret->object.type = TYPE_NONE;
+		return &ret->object;
 	}
+	return obj;
 }
 
-struct object *parse_object(unsigned char *sha1)
+struct object *parse_object(const unsigned char *sha1)
 {
-	unsigned long mapsize;
-	void *map = map_sha1_file(sha1, &mapsize);
-	if (map) {
-		char type[100];
-		unsigned long size;
-		void *buffer = unpack_sha1_file(map, mapsize, type, &size);
-		munmap(map, mapsize);
-		if (!buffer)
-			return NULL;
+	unsigned long size;
+	char type[20];
+	void *buffer = read_sha1_file(sha1, type, &size);
+	if (buffer) {
+		struct object *obj;
 		if (check_sha1_signature(sha1, buffer, size, type) < 0)
 			printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
-		free(buffer);
-		if (!strcmp(type, "blob")) {
-			struct blob *ret = lookup_blob(sha1);
-			parse_blob(ret);
-			return &ret->object;
-		} else if (!strcmp(type, "tree")) {
-			struct tree *ret = lookup_tree(sha1);
-			parse_tree(ret);
-			return &ret->object;
-		} else if (!strcmp(type, "commit")) {
-			struct commit *ret = lookup_commit(sha1);
-			parse_commit(ret);
-			return &ret->object;
-		} else if (!strcmp(type, "tag")) {
-			struct tag *ret = lookup_tag(sha1);
-			parse_tag(ret);
-			return &ret->object;
+		if (!strcmp(type, blob_type)) {
+			struct blob *blob = lookup_blob(sha1);
+			parse_blob_buffer(blob, buffer, size);
+			obj = &blob->object;
+		} else if (!strcmp(type, tree_type)) {
+			struct tree *tree = lookup_tree(sha1);
+			obj = &tree->object;
+			if (!tree->object.parsed) {
+				parse_tree_buffer(tree, buffer, size);
+				buffer = NULL;
+			}
+		} else if (!strcmp(type, commit_type)) {
+			struct commit *commit = lookup_commit(sha1);
+			parse_commit_buffer(commit, buffer, size);
+			if (!commit->buffer) {
+				commit->buffer = buffer;
+				buffer = NULL;
+			}
+			obj = &commit->object;
+		} else if (!strcmp(type, tag_type)) {
+			struct tag *tag = lookup_tag(sha1);
+			parse_tag_buffer(tag, buffer, size);
+			obj = &tag->object;
 		} else {
-			return NULL;
+			obj = NULL;
 		}
+		free(buffer);
+		return obj;
 	}
 	return NULL;
 }
+
+struct object_list *object_list_insert(struct object *item,
+				       struct object_list **list_p)
+{
+	struct object_list *new_list = xmalloc(sizeof(struct object_list));
+        new_list->item = item;
+        new_list->next = *list_p;
+        *list_p = new_list;
+        return new_list;
+}
+
+void object_list_append(struct object *item,
+			struct object_list **list_p)
+{
+	while (*list_p) {
+		list_p = &((*list_p)->next);
+	}
+	*list_p = xmalloc(sizeof(struct object_list));
+	(*list_p)->next = NULL;
+	(*list_p)->item = item;
+}
+
+unsigned object_list_length(struct object_list *list)
+{
+	unsigned ret = 0;
+	while (list) {
+		list = list->next;
+		ret++;
+	}
+	return ret;
+}
+
+int object_list_contains(struct object_list *list, struct object *obj)
+{
+	while (list) {
+		if (list->item == obj)
+			return 1;
+		list = list->next;
+	}
+	return 0;
+}