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[PATCH v2 02/14] commit-slab: support shared commit-slab




define_shared_commit_slab() could be used in a header file to define a
commit-slab. One of these C files must include commit-slab-impl.h and
"call" implement_shared_commit_slab().

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 commit-slab-hdr.h  | 13 +++++++++++++
 commit-slab-impl.h | 20 +++++++++++++-------
 commit-slab.h      |  2 +-
 3 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/commit-slab-hdr.h b/commit-slab-hdr.h
index fb5220fb7d..adc7b46c83 100644
--- a/commit-slab-hdr.h
+++ b/commit-slab-hdr.h
@@ -27,4 +27,17 @@ struct slabname {							\
 	(stride), 0, NULL \
 }
 
+#define declare_commit_slab_prototypes(slabname, elemtype)		\
+									\
+void init_ ##slabname## _with_stride(struct slabname *s, unsigned stride); \
+void init_ ##slabname(struct slabname *s);				\
+void clear_ ##slabname(struct slabname *s);				\
+elemtype *slabname## _at_peek(struct slabname *s, const struct commit *c, int add_if_missing); \
+elemtype *slabname## _at(struct slabname *s, const struct commit *c);	\
+elemtype *slabname## _peek(struct slabname *s, const struct commit *c)
+
+#define define_shared_commit_slab(slabname, elemtype) \
+	declare_commit_slab(slabname, elemtype); \
+	declare_commit_slab_prototypes(slabname, elemtype)
+
 #endif /* COMMIT_SLAB_HDR_H */
diff --git a/commit-slab-impl.h b/commit-slab-impl.h
index 234d9ee5f0..19a88d7d8f 100644
--- a/commit-slab-impl.h
+++ b/commit-slab-impl.h
@@ -3,11 +3,17 @@
 
 #define MAYBE_UNUSED __attribute__((__unused__))
 
-#define implement_commit_slab(slabname, elemtype) 			\
+#define implement_static_commit_slab(slabname, elemtype) \
+	implement_commit_slab(slabname, elemtype, static MAYBE_UNUSED)
+
+#define implement_shared_commit_slab(slabname, elemtype) \
+	implement_commit_slab(slabname, elemtype, )
+
+#define implement_commit_slab(slabname, elemtype, scope)		\
 									\
 static int stat_ ##slabname## realloc;					\
 									\
-static MAYBE_UNUSED void init_ ##slabname## _with_stride(struct slabname *s, \
+scope void init_ ##slabname## _with_stride(struct slabname *s,		\
 						   unsigned stride)	\
 {									\
 	unsigned int elem_size;						\
@@ -20,12 +26,12 @@ static MAYBE_UNUSED void init_ ##slabname## _with_stride(struct slabname *s, \
 	s->slab = NULL;							\
 }									\
 									\
-static MAYBE_UNUSED void init_ ##slabname(struct slabname *s)		\
+scope void init_ ##slabname(struct slabname *s)				\
 {									\
 	init_ ##slabname## _with_stride(s, 1);				\
 }									\
 									\
-static MAYBE_UNUSED void clear_ ##slabname(struct slabname *s)		\
+scope void clear_ ##slabname(struct slabname *s)			\
 {									\
 	unsigned int i;							\
 	for (i = 0; i < s->slab_count; i++)				\
@@ -34,7 +40,7 @@ static MAYBE_UNUSED void clear_ ##slabname(struct slabname *s)		\
 	FREE_AND_NULL(s->slab);						\
 }									\
 									\
-static MAYBE_UNUSED elemtype *slabname## _at_peek(struct slabname *s,	\
+scope elemtype *slabname## _at_peek(struct slabname *s,			\
 						  const struct commit *c, \
 						  int add_if_missing)   \
 {									\
@@ -62,13 +68,13 @@ static MAYBE_UNUSED elemtype *slabname## _at_peek(struct slabname *s,	\
 	return &s->slab[nth_slab][nth_slot * s->stride];		\
 }									\
 									\
-static MAYBE_UNUSED elemtype *slabname## _at(struct slabname *s,	\
+scope elemtype *slabname## _at(struct slabname *s,			\
 					     const struct commit *c)	\
 {									\
 	return slabname##_at_peek(s, c, 1);				\
 }									\
 									\
-static MAYBE_UNUSED elemtype *slabname## _peek(struct slabname *s,	\
+scope elemtype *slabname## _peek(struct slabname *s,			\
 					     const struct commit *c)	\
 {									\
 	return slabname##_at_peek(s, c, 0);				\
diff --git a/commit-slab.h b/commit-slab.h
index 204b928584..dc029acc66 100644
--- a/commit-slab.h
+++ b/commit-slab.h
@@ -46,6 +46,6 @@
 
 #define define_commit_slab(slabname, elemtype) \
 	declare_commit_slab(slabname, elemtype); \
-	implement_commit_slab(slabname, elemtype)
+	implement_static_commit_slab(slabname, elemtype)
 
 #endif /* COMMIT_SLAB_H */
-- 
2.17.0.705.g3525833791