Fix crash when reading the empty tree

diff --git a/revision.h b/revision.h
index 0bed3c04ff777276f04f4f13b10764653923430f..48d7b4ca94f3fd00f7a1f6a3fb57ebed934ffc0d 100644 (file)
--- a/revision.h
+++ b/revision.h
@@ -4,6 +4,16 @@
 #define SEEN           (1u<<0)
 #define UNINTERESTING   (1u<<1)
 #define TREECHANGE     (1u<<2)
+#define SHOWN          (1u<<3)
+#define TMP_MARK       (1u<<4) /* for isolated cases; clean after use */
+#define BOUNDARY       (1u<<5)
+#define BOUNDARY_SHOW  (1u<<6)
+#define ADDED          (1u<<7) /* Parents already parsed and added? */
+
+struct rev_info;
+struct log_info;
+
+typedef void (prune_fn_t)(struct rev_info *revs, struct commit *commit);
 
 struct rev_info {
        /* Starting list */
@@ -12,10 +22,13 @@ struct rev_info {
 
        /* Basic information */
        const char *prefix;
-       const char **paths;
+       void *prune_data;
+       prune_fn_t *prune_fn;
 
        /* Traversal flags */
        unsigned int    dense:1,
+                       no_merges:1,
+                       no_walk:1,
                        remove_empty_trees:1,
                        lifo:1,
                        topo_order:1,
@@ -24,15 +37,50 @@ struct rev_info {
                        blob_objects:1,
                        edge_hint:1,
                        limited:1,
-                       unpacked:1;
+                       unpacked:1,
+                       boundary:1,
+                       parents:1;
+
+       /* Diff flags */
+       unsigned int    diff:1,
+                       full_diff:1,
+                       show_root_diff:1,
+                       no_commit_id:1,
+                       verbose_header:1,
+                       ignore_merges:1,
+                       combine_merges:1,
+                       dense_combined_merges:1,
+                       always_show_header:1;
+
+       /* Format info */
+       unsigned int    shown_one:1,
+                       abbrev_commit:1;
+       unsigned int    abbrev;
+       enum cmit_fmt   commit_format;
+       struct log_info *loginfo;
 
        /* special limits */
        int max_count;
        unsigned long max_age;
        unsigned long min_age;
+
+       /* diff info for patches and for paths limiting */
+       struct diff_options diffopt;
+       struct diff_options pruning;
+
+       topo_sort_set_fn_t topo_setter;
+       topo_sort_get_fn_t topo_getter;
 };
 
+#define REV_TREE_SAME          0
+#define REV_TREE_NEW           1
+#define REV_TREE_DIFFERENT     2
+
 /* revision.c */
+extern int rev_same_tree_as_empty(struct rev_info *, struct tree *t1);
+extern int rev_compare_tree(struct rev_info *, struct tree *t1, struct tree *t2);
+
+extern void init_revisions(struct rev_info *revs);
 extern int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def);
 extern void prepare_revision_walk(struct rev_info *revs);
 extern struct commit *get_revision(struct rev_info *revs);