Cleanup of unused symcache variable inside diff-lib.c

Commit c40641b77b0274186fd1b327d5dc3246f814aaaf, 'Optimize
symlink/directory detection' by Linus Torvalds, removed the 'char
*symcache' parameter to the has_symlink_leading_path() function.  This
made all variables currently named 'symcache' inside diff-lib.c
unnecessary.

This also let us throw away the 'struct oneway_unpack_data', and
instead directly use the 'struct rev_info *revs' member, which
was the only member left after removal of the 'symcache[] array'
member.  The 'struct oneway_unpack_data' was introduced by the
following commit:

  948dd346  "diff-files: careful when inspecting work tree items"

Impact: cleanup
        PATH_MAX bytes less memory stack usage in some cases

Signed-off-by: Kjetil Barvik <barvik@broadpark.no>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff-lib.c b/diff-lib.c
index ae96c64ca209f4df9008198e8a04b160bed618c7..a41e1ec07ccd707969aa51768dac3e2b6356ddc6 100644 (file)
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -61,14 +61,12 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
        int silent_on_removed = option & DIFF_SILENT_ON_REMOVED;
        unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
                              ? CE_MATCH_RACY_IS_DIRTY : 0);
-       char symcache[PATH_MAX];
 
        diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");
 
        if (diff_unmerged_stage < 0)
                diff_unmerged_stage = 2;
        entries = active_nr;
-       symcache[0] = '\0';
        for (i = 0; i < entries; i++) {
                struct stat st;
                unsigned int oldmode, newmode;
@@ -198,11 +196,6 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
  * diff-index
  */
 
-struct oneway_unpack_data {
-       struct rev_info *revs;
-       char symcache[PATH_MAX];
-};
-
 /* A file entry went away or appeared */
 static void diff_index_show_file(struct rev_info *revs,
                                 const char *prefix,
@@ -216,8 +209,7 @@ static void diff_index_show_file(struct rev_info *revs,
 static int get_stat_data(struct cache_entry *ce,
                         const unsigned char **sha1p,
                         unsigned int *modep,
-                        int cached, int match_missing,
-                        struct oneway_unpack_data *cbdata)
+                        int cached, int match_missing)
 {
        const unsigned char *sha1 = ce->sha1;
        unsigned int mode = ce->ce_mode;
@@ -248,25 +240,24 @@ static int get_stat_data(struct cache_entry *ce,
        return 0;
 }
 
-static void show_new_file(struct oneway_unpack_data *cbdata,
+static void show_new_file(struct rev_info *revs,
                          struct cache_entry *new,
                          int cached, int match_missing)
 {
        const unsigned char *sha1;
        unsigned int mode;
-       struct rev_info *revs = cbdata->revs;
 
        /*
         * New file in the index: it might actually be different in
         * the working copy.
         */
-       if (get_stat_data(new, &sha1, &mode, cached, match_missing, cbdata) < 0)
+       if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0)
                return;
 
        diff_index_show_file(revs, "+", new, sha1, mode);
 }
 
-static int show_modified(struct oneway_unpack_data *cbdata,
+static int show_modified(struct rev_info *revs,
                         struct cache_entry *old,
                         struct cache_entry *new,
                         int report_missing,
@@ -274,9 +265,8 @@ static int show_modified(struct oneway_unpack_data *cbdata,
 {
        unsigned int mode, oldmode;
        const unsigned char *sha1;
-       struct rev_info *revs = cbdata->revs;
 
-       if (get_stat_data(new, &sha1, &mode, cached, match_missing, cbdata) < 0) {
+       if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) {
                if (report_missing)
                        diff_index_show_file(revs, "-", old,
                                             old->sha1, old->ce_mode);
@@ -344,8 +334,7 @@ static void do_oneway_diff(struct unpack_trees_options *o,
        struct cache_entry *idx,
        struct cache_entry *tree)
 {
-       struct oneway_unpack_data *cbdata = o->unpack_data;
-       struct rev_info *revs = cbdata->revs;
+       struct rev_info *revs = o->unpack_data;
        int match_missing, cached;
 
        /*
@@ -368,7 +357,7 @@ static void do_oneway_diff(struct unpack_trees_options *o,
         * Something added to the tree?
         */
        if (!tree) {
-               show_new_file(cbdata, idx, cached, match_missing);
+               show_new_file(revs, idx, cached, match_missing);
                return;
        }
 
@@ -381,7 +370,7 @@ static void do_oneway_diff(struct unpack_trees_options *o,
        }
 
        /* Show difference between old and new */
-       show_modified(cbdata, tree, idx, 1, cached, match_missing);
+       show_modified(revs, tree, idx, 1, cached, match_missing);
 }
 
 static inline void skip_same_name(struct cache_entry *ce, struct unpack_trees_options *o)
@@ -418,8 +407,7 @@ static int oneway_diff(struct cache_entry **src, struct unpack_trees_options *o)
 {
        struct cache_entry *idx = src[0];
        struct cache_entry *tree = src[1];
-       struct oneway_unpack_data *cbdata = o->unpack_data;
-       struct rev_info *revs = cbdata->revs;
+       struct rev_info *revs = o->unpack_data;
 
        if (idx && ce_stage(idx))
                skip_same_name(idx, o);
@@ -446,7 +434,6 @@ int run_diff_index(struct rev_info *revs, int cached)
        const char *tree_name;
        struct unpack_trees_options opts;
        struct tree_desc t;
-       struct oneway_unpack_data unpack_cb;
 
        mark_merge_entries();
 
@@ -456,14 +443,12 @@ int run_diff_index(struct rev_info *revs, int cached)
        if (!tree)
                return error("bad tree object %s", tree_name);
 
-       unpack_cb.revs = revs;
-       unpack_cb.symcache[0] = '\0';
        memset(&opts, 0, sizeof(opts));
        opts.head_idx = 1;
        opts.index_only = cached;
        opts.merge = 1;
        opts.fn = oneway_diff;
-       opts.unpack_data = &unpack_cb;
+       opts.unpack_data = revs;
        opts.src_index = &the_index;
        opts.dst_index = NULL;
 
@@ -486,7 +471,6 @@ int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
        struct cache_entry *last = NULL;
        struct unpack_trees_options opts;
        struct tree_desc t;
-       struct oneway_unpack_data unpack_cb;
 
        /*
         * This is used by git-blame to run diff-cache internally;
@@ -515,14 +499,12 @@ int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
        if (!tree)
                die("bad tree object %s", sha1_to_hex(tree_sha1));
 
-       unpack_cb.revs = &revs;
-       unpack_cb.symcache[0] = '\0';
        memset(&opts, 0, sizeof(opts));
        opts.head_idx = 1;
        opts.index_only = 1;
        opts.merge = 1;
        opts.fn = oneway_diff;
-       opts.unpack_data = &unpack_cb;
+       opts.unpack_data = &revs;
        opts.src_index = &the_index;
        opts.dst_index = &the_index;