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Make it possible to not clobber object.util in sort_in_topological_order (take 2) 

Signed-off-by: Fredrik Kuivinen <freku045@student.liu.se>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Fredrik Kuivinen 2006-03-10 10:21:37 +01:00 committed by Junio C Hamano
parent f2561fda36
commit 6b6dcfc297
2 changed files with 44 additions and 12 deletions
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36
commit.c
View File

@ -569,10 +569,28 @@ int count_parents(struct commit * commit)
return count;
}
void topo_sort_default_setter(struct commit *c, void *data)
{
c->object.util = data;
}
void *topo_sort_default_getter(struct commit *c)
{
return c->object.util;
}
/*
* Performs an in-place topological sort on the list supplied.
*/
void sort_in_topological_order(struct commit_list ** list, int lifo)
{
sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
topo_sort_default_getter);
}
void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
topo_sort_set_fn_t setter,
topo_sort_get_fn_t getter)
{
struct commit_list * next = *list;
struct commit_list * work = NULL, **insert;
@ -596,7 +614,7 @@ void sort_in_topological_order(struct commit_list ** list, int lifo)
next=*list;
while (next) {
next_nodes->list_item = next;
next->item->object.util = next_nodes;
setter(next->item, next_nodes);
next_nodes++;
next = next->next;
}
@ -606,8 +624,8 @@ void sort_in_topological_order(struct commit_list ** list, int lifo)
struct commit_list * parents = next->item->parents;
while (parents) {
struct commit * parent=parents->item;
struct sort_node * pn = (struct sort_node *)parent->object.util;
struct sort_node * pn = (struct sort_node *) getter(parent);
if (pn)
pn->indegree++;
parents=parents->next;
@ -624,7 +642,7 @@ void sort_in_topological_order(struct commit_list ** list, int lifo)
next=*list;
insert = &work;
while (next) {
struct sort_node * node = (struct sort_node *)next->item->object.util;
struct sort_node * node = (struct sort_node *) getter(next->item);
if (node->indegree == 0) {
insert = &commit_list_insert(next->item, insert)->next;
@ -637,15 +655,15 @@ void sort_in_topological_order(struct commit_list ** list, int lifo)
sort_by_date(&work);
while (work) {
struct commit * work_item = pop_commit(&work);
struct sort_node * work_node = (struct sort_node *)work_item->object.util;
struct sort_node * work_node = (struct sort_node *) getter(work_item);
struct commit_list * parents = work_item->parents;
while (parents) {
struct commit * parent=parents->item;
struct sort_node * pn = (struct sort_node *)parent->object.util;
struct sort_node * pn = (struct sort_node *) getter(parent);
if (pn) {
/*
/*
* parents are only enqueued for emission
* when all their children have been emitted thereby
* guaranteeing topological order.
@ -667,7 +685,7 @@ void sort_in_topological_order(struct commit_list ** list, int lifo)
*pptr = work_node->list_item;
pptr = &(*pptr)->next;
*pptr = NULL;
work_item->object.util = NULL;
setter(work_item, NULL);
}
free(nodes);
}

20
commit.h
View File

@ -65,15 +65,29 @@ int count_parents(struct commit * commit);
/*
* Performs an in-place topological sort of list supplied.
*
* Pre-conditions:
* Pre-conditions for sort_in_topological_order:
* all commits in input list and all parents of those
* commits must have object.util == NULL
*
* Post-conditions:
*
* Pre-conditions for sort_in_topological_order_fn:
* all commits in input list and all parents of those
* commits must have getter(commit) == NULL
*
* Post-conditions:
* invariant of resulting list is:
* a reachable from b => ord(b) < ord(a)
* in addition, when lifo == 0, commits on parallel tracks are
* sorted in the dates order.
*/
typedef void (*topo_sort_set_fn_t)(struct commit*, void *data);
typedef void* (*topo_sort_get_fn_t)(struct commit*);
void topo_sort_default_setter(struct commit *c, void *data);
void *topo_sort_default_getter(struct commit *c);
void sort_in_topological_order(struct commit_list ** list, int lifo);
void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
topo_sort_set_fn_t setter,
topo_sort_get_fn_t getter);
#endif /* COMMIT_H */