alloc.c: remove the alloc_raw_commit_node() function

In order to encapsulate the setting of the unique commit index, commit
969eba63 ("commit: push commit_index update into alloc_commit_node",
10-06-2014) introduced a (logically private) intermediary allocator
function. However, this function (alloc_raw_commit_node()) was declared
as a public function, which undermines its entire purpose.

Introduce an inline function, alloc_node(), which implements the main
logic of the allocator used by DEFINE_ALLOCATOR, and redefine the macro
in terms of the new function. In addition, use the new function in the
implementation of the alloc_commit_node() allocator, rather than the
intermediary allocator, which can now be removed.

Noticed by sparse ("symbol 'alloc_raw_commit_node' was not declared.
Should it be static?").

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/alloc.c b/alloc.c
index eb22a45c9d0acf08a6024094bd0a2090a7307945..d7c3605fd68e0a306a9f6ebc0631dc8f7f4222a1 100644 (file)
--- a/alloc.c
+++ b/alloc.c
@@ -19,22 +19,10 @@
 #define BLOCKING 1024
 
 #define DEFINE_ALLOCATOR(name, type)                           \
-static unsigned int name##_allocs;                             \
+static struct alloc_state name##_state;                                \
 void *alloc_##name##_node(void)                                        \
 {                                                              \
-       static int nr;                                          \
-       static type *block;                                     \
-       void *ret;                                              \
-                                                               \
-       if (!nr) {                                              \
-               nr = BLOCKING;                                  \
-               block = xmalloc(BLOCKING * sizeof(type));       \
-       }                                                       \
-       nr--;                                                   \
-       name##_allocs++;                                        \
-       ret = block++;                                          \
-       memset(ret, 0, sizeof(type));                           \
-       return ret;                                             \
+       return alloc_node(&name##_state, sizeof(type));         \
 }
 
 union any_object {
@@ -45,16 +33,39 @@ union any_object {
        struct tag tag;
 };
 
+struct alloc_state {
+       int count; /* total number of nodes allocated */
+       int nr;    /* number of nodes left in current allocation */
+       void *p;   /* first free node in current allocation */
+};
+
+static inline void *alloc_node(struct alloc_state *s, size_t node_size)
+{
+       void *ret;
+
+       if (!s->nr) {
+               s->nr = BLOCKING;
+               s->p = xmalloc(BLOCKING * node_size);
+       }
+       s->nr--;
+       s->count++;
+       ret = s->p;
+       s->p = (char *)s->p + node_size;
+       memset(ret, 0, node_size);
+       return ret;
+}
+
 DEFINE_ALLOCATOR(blob, struct blob)
 DEFINE_ALLOCATOR(tree, struct tree)
-DEFINE_ALLOCATOR(raw_commit, struct commit)
 DEFINE_ALLOCATOR(tag, struct tag)
 DEFINE_ALLOCATOR(object, union any_object)
 
+static struct alloc_state commit_state;
+
 void *alloc_commit_node(void)
 {
        static int commit_count;
-       struct commit *c = alloc_raw_commit_node();
+       struct commit *c = alloc_node(&commit_state, sizeof(struct commit));
        c->index = commit_count++;
        return c;
 }
@@ -66,13 +77,13 @@ static void report(const char *name, unsigned int count, size_t size)
 }
 
 #define REPORT(name, type)     \
-    report(#name, name##_allocs, name##_allocs * sizeof(type) >> 10)
+    report(#name, name##_state.count, name##_state.count * sizeof(type) >> 10)
 
 void alloc_report(void)
 {
        REPORT(blob, struct blob);
        REPORT(tree, struct tree);
-       REPORT(raw_commit, struct commit);
+       REPORT(commit, struct commit);
        REPORT(tag, struct tag);
        REPORT(object, union any_object);
 }