mirror of
https://github.com/git/git.git
synced 2024-11-27 20:14:30 +08:00
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
|
#ifndef COMMIT_SLAB_H
|
||
|
|
#define COMMIT_SLAB_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
|
||
|
|
* of elemtype to commits, and a few functions to use that struct.
|
||
|
|
*
|
||
|
|
* After including this header file, using:
|
||
|
|
*
|
||
|
|
* define_commit_slab(indegee, 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.
|
||
|
|
*
|
||
|
|
* - 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
|
||
|
|
* each commit with an array of one integer.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* 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(struct slabname) * 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, ix; \
|
||
|
|
\
|
||
|
|
ix = c->index * s->stride; \
|
||
|
|
nth_slab = ix / s->slab_size; \
|
||
|
|
nth_slot = ix % 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)); \
|
||
|
|
return &s->slab[nth_slab][nth_slot]; \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
static int stat_ ##slabname## realloc
|
||
|
|
|
||
|
|
#endif /* COMMIT_SLAB_H */
|