merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 194 insertions, 0 deletions

diff --git a/third_party/git/object.h b/third_party/git/object.h
new file mode 100644
index 0000000000..0120892bbd
--- /dev/null
+++ b/third_party/git/object.h
@@ -0,0 +1,194 @@
+#ifndef OBJECT_H
+#define OBJECT_H
+
+#include "cache.h"
+
+struct buffer_slab;
+
+struct parsed_object_pool {
+	struct object **obj_hash;
+	int nr_objs, obj_hash_size;
+
+	/* TODO: migrate alloc_states to mem-pool? */
+	struct alloc_state *blob_state;
+	struct alloc_state *tree_state;
+	struct alloc_state *commit_state;
+	struct alloc_state *tag_state;
+	struct alloc_state *object_state;
+	unsigned commit_count;
+
+	/* parent substitutions from .git/info/grafts and .git/shallow */
+	struct commit_graft **grafts;
+	int grafts_alloc, grafts_nr;
+
+	int is_shallow;
+	struct stat_validity *shallow_stat;
+	char *alternate_shallow_file;
+
+	int commit_graft_prepared;
+
+	struct buffer_slab *buffer_slab;
+};
+
+struct parsed_object_pool *parsed_object_pool_new(void);
+void parsed_object_pool_clear(struct parsed_object_pool *o);
+
+struct object_list {
+	struct object *item;
+	struct object_list *next;
+};
+
+struct object_array {
+	unsigned int nr;
+	unsigned int alloc;
+	struct object_array_entry {
+		struct object *item;
+		/*
+		 * name or NULL.  If non-NULL, the memory pointed to
+		 * is owned by this object *except* if it points at
+		 * object_array_slopbuf, which is a static copy of the
+		 * empty string.
+		 */
+		char *name;
+		char *path;
+		unsigned mode;
+	} *objects;
+};
+
+#define OBJECT_ARRAY_INIT { 0, 0, NULL }
+
+/*
+ * object flag allocation:
+ * revision.h:               0---------10                              25----28
+ * fetch-pack.c:             01
+ * negotiator/default.c:       2--5
+ * walker.c:                 0-2
+ * upload-pack.c:                4       11-----14  16-----19
+ * builtin/blame.c:                        12-13
+ * bisect.c:                                        16
+ * bundle.c:                                        16
+ * http-push.c:                                     16-----19
+ * commit-reach.c:                                15-------19
+ * sha1-name.c:                                              20
+ * list-objects-filter.c:                                      21
+ * builtin/fsck.c:           0--3
+ * builtin/index-pack.c:                                     2021
+ * builtin/pack-objects.c:                                   20
+ * builtin/reflog.c:                   10--12
+ * builtin/show-branch.c:    0-------------------------------------------26
+ * builtin/unpack-objects.c:                                 2021
+ */
+#define FLAG_BITS  29
+
+/*
+ * The object type is stored in 3 bits.
+ */
+struct object {
+	unsigned parsed : 1;
+	unsigned type : TYPE_BITS;
+	unsigned flags : FLAG_BITS;
+	struct object_id oid;
+};
+
+const char *type_name(unsigned int type);
+int type_from_string_gently(const char *str, ssize_t, int gentle);
+#define type_from_string(str) type_from_string_gently(str, -1, 0)
+
+/*
+ * Return the current number of buckets in the object hashmap.
+ */
+unsigned int get_max_object_index(void);
+
+/*
+ * Return the object from the specified bucket in the object hashmap.
+ */
+struct object *get_indexed_object(unsigned int);
+
+/*
+ * This can be used to see if we have heard of the object before, but
+ * it can return "yes we have, and here is a half-initialised object"
+ * for an object that we haven't loaded/parsed yet.
+ *
+ * When parsing a commit to create an in-core commit object, its
+ * parents list holds commit objects that represent its parents, but
+ * they are expected to be lazily initialized and do not know what
+ * their trees or parents are yet.  When this function returns such a
+ * half-initialised objects, the caller is expected to initialize them
+ * by calling parse_object() on them.
+ */
+struct object *lookup_object(struct repository *r, const struct object_id *oid);
+
+void *create_object(struct repository *r, const struct object_id *oid, void *obj);
+
+void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet);
+
+/*
+ * Returns the object, having parsed it to find out what it is.
+ *
+ * Returns NULL if the object is missing or corrupt.
+ */
+struct object *parse_object(struct repository *r, const struct object_id *oid);
+
+/*
+ * Like parse_object, but will die() instead of returning NULL. If the
+ * "name" parameter is not NULL, it is included in the error message
+ * (otherwise, the hex object ID is given).
+ */
+struct object *parse_object_or_die(const struct object_id *oid, const char *name);
+
+/* Given the result of read_sha1_file(), returns the object after
+ * parsing it.  eaten_p indicates if the object has a borrowed copy
+ * of buffer and the caller should not free() it.
+ */
+struct object *parse_object_buffer(struct repository *r, const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
+
+/** Returns the object, with potentially excess memory allocated. **/
+struct object *lookup_unknown_object(const struct object_id *oid);
+
+struct object_list *object_list_insert(struct object *item,
+				       struct object_list **list_p);
+
+int object_list_contains(struct object_list *list, struct object *obj);
+
+/* Object array handling .. */
+void add_object_array(struct object *obj, const char *name, struct object_array *array);
+void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
+
+/*
+ * Returns NULL if the array is empty. Otherwise, returns the last object
+ * after removing its entry from the array. Other resources associated
+ * with that object are left in an unspecified state and should not be
+ * examined.
+ */
+struct object *object_array_pop(struct object_array *array);
+
+typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
+
+/*
+ * Apply want to each entry in array, retaining only the entries for
+ * which the function returns true.  Preserve the order of the entries
+ * that are retained.
+ */
+void object_array_filter(struct object_array *array,
+			 object_array_each_func_t want, void *cb_data);
+
+/*
+ * Remove from array all but the first entry with a given name.
+ * Warning: this function uses an O(N^2) algorithm.
+ */
+void object_array_remove_duplicates(struct object_array *array);
+
+/*
+ * Remove any objects from the array, freeing all used memory; afterwards
+ * the array is ready to store more objects with add_object_array().
+ */
+void object_array_clear(struct object_array *array);
+
+void clear_object_flags(unsigned flags);
+
+/*
+ * Clear the specified object flags from all in-core commit objects.
+ */
+void clear_commit_marks_all(unsigned int flags);
+
+#endif /* OBJECT_H */