Preallocate memory earlier in fast-import

I'm about to teach fast-import how to reload the marks file created
by a prior session.  The general approach that I want to use is to
immediately parse the marks file when the specific argument is found
in argv, thereby allowing the caller to supply multiple marks files,
as the mark space can be sparsely populated.

To make that work out we need to allocate our object tables before
we parse the command line options.  Since none of these tables
depend on the command line options, we can easily relocate them.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/fast-import.c b/fast-import.c
index cc3347b23d0c7dba1bc05c65cb58215c92bb8547..28f5e7c3b1f1ba02d3f09a64ada3098325460307 100644 (file)
--- a/fast-import.c
+++ b/fast-import.c
@@ -1988,6 +1988,12 @@ int main(int argc, const char **argv)
        int i, show_stats = 1;
 
        git_config(git_default_config);
+       alloc_objects(object_entry_alloc);
+       strbuf_init(&command_buf);
+       atom_table = xcalloc(atom_table_sz, sizeof(struct atom_str*));
+       branch_table = xcalloc(branch_table_sz, sizeof(struct branch*));
+       avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
+       marks = pool_calloc(1, sizeof(struct mark_set));
 
        for (i = 1; i < argc; i++) {
                const char *a = argv[i];
@@ -2031,14 +2037,6 @@ int main(int argc, const char **argv)
        if (i != argc)
                usage(fast_import_usage);
 
-       alloc_objects(object_entry_alloc);
-       strbuf_init(&command_buf);
-
-       atom_table = xcalloc(atom_table_sz, sizeof(struct atom_str*));
-       branch_table = xcalloc(branch_table_sz, sizeof(struct branch*));
-       avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
-       marks = pool_calloc(1, sizeof(struct mark_set));
-
        start_packfile();
        for (;;) {
                read_next_command();