#ifndef COMMIT_SLAB_H
#define COMMIT_SLAB_H
+#include "commit-slab-decl.h"
+#include "commit-slab-impl.h"
+
/*
* define_commit_slab(slabname, elemtype) creates boilerplate code to define
* a new struct (struct slabname) that is used to associate a piece of data
*
* After including this header file, using:
*
- * define_commit_slab(indegee, int);
+ * define_commit_slab(indegree, int);
*
* will let you call the following functions:
*
* - int *indegree_at(struct indegree *, struct commit *);
*
* This function locates the data associated with the given commit in
- * the indegree slab, and returns the pointer to it.
+ * the indegree slab, and returns the pointer to it. The location to
+ * store the data is allocated as necessary.
+ *
+ * - int *indegree_peek(struct indegree *, struct commit *);
+ *
+ * This function is similar to indegree_at(), but it will return NULL
+ * until a call to indegree_at() was made for the commit.
*
* - void init_indegree(struct indegree *);
* void init_indegree_with_stride(struct indegree *, int);
*
* Initializes the indegree slab that associates an array of integers
* to each commit. 'stride' specifies how big each array is. The slab
- * that id initialied by the variant without "_with_stride" associates
+ * that is initialized by the variant without "_with_stride" associates
* each commit with an array of one integer.
+ *
+ * - void clear_indegree(struct indegree *);
+ *
+ * Empties the slab. The slab can be reused with the same stride
+ * without calling init_indegree() again or can be reconfigured to a
+ * different stride by calling init_indegree_with_stride().
+ *
+ * Call this function before the slab falls out of scope to avoid
+ * leaking memory.
*/
-/* allocate ~512kB at once, allowing for malloc overhead */
-#ifndef COMMIT_SLAB_SIZE
-#define COMMIT_SLAB_SIZE (512*1024-32)
-#endif
-
-#define define_commit_slab(slabname, elemtype) \
- \
-struct slabname { \
- unsigned slab_size; \
- unsigned stride; \
- unsigned slab_count; \
- elemtype **slab; \
-}; \
-static int stat_ ##slabname## realloc; \
- \
-static void init_ ##slabname## _with_stride(struct slabname *s, \
- unsigned stride) \
-{ \
- unsigned int elem_size; \
- if (!stride) \
- stride = 1; \
- s->stride = stride; \
- elem_size = sizeof(elemtype) * stride; \
- s->slab_size = COMMIT_SLAB_SIZE / elem_size; \
- s->slab_count = 0; \
- s->slab = NULL; \
-} \
- \
-static void init_ ##slabname(struct slabname *s) \
-{ \
- init_ ##slabname## _with_stride(s, 1); \
-} \
- \
-static void clear_ ##slabname(struct slabname *s) \
-{ \
- int i; \
- for (i = 0; i < s->slab_count; i++) \
- free(s->slab[i]); \
- s->slab_count = 0; \
- free(s->slab); \
- s->slab = NULL; \
-} \
- \
-static elemtype *slabname## _at(struct slabname *s, \
- const struct commit *c) \
-{ \
- int nth_slab, nth_slot; \
- \
- nth_slab = c->index / s->slab_size; \
- nth_slot = c->index % s->slab_size; \
- \
- if (s->slab_count <= nth_slab) { \
- int i; \
- s->slab = xrealloc(s->slab, \
- (nth_slab + 1) * sizeof(s->slab)); \
- stat_ ##slabname## realloc++; \
- for (i = s->slab_count; i <= nth_slab; i++) \
- s->slab[i] = NULL; \
- s->slab_count = nth_slab + 1; \
- } \
- if (!s->slab[nth_slab]) \
- s->slab[nth_slab] = xcalloc(s->slab_size, \
- sizeof(**s->slab) * s->stride); \
- return &s->slab[nth_slab][nth_slot * s->stride]; \
-} \
- \
-static int stat_ ##slabname## realloc
+#define define_commit_slab(slabname, elemtype) \
+ declare_commit_slab(slabname, elemtype); \
+ implement_static_commit_slab(slabname, elemtype)
#endif /* COMMIT_SLAB_H */