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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "commit_list.h"
#include "revwalk.h"
#include "pool.h"
#include "odb.h"
#include "commit.h"
int git_commit_list_generation_cmp(const void *a, const void *b)
{
uint32_t generation_a = ((git_commit_list_node *) a)->generation;
uint32_t generation_b = ((git_commit_list_node *) b)->generation;
if (!generation_a || !generation_b) {
/* Fall back to comparing by timestamps if at least one commit lacks a generation. */
return git_commit_list_time_cmp(a, b);
}
if (generation_a < generation_b)
return 1;
if (generation_a > generation_b)
return -1;
return 0;
}
int git_commit_list_time_cmp(const void *a, const void *b)
{
int64_t time_a = ((git_commit_list_node *) a)->time;
int64_t time_b = ((git_commit_list_node *) b)->time;
if (time_a < time_b)
return 1;
if (time_a > time_b)
return -1;
return 0;
}
git_commit_list *git_commit_list_insert(git_commit_list_node *item, git_commit_list **list_p)
{
git_commit_list *new_list = git__malloc(sizeof(git_commit_list));
if (new_list != NULL) {
new_list->item = item;
new_list->next = *list_p;
}
*list_p = new_list;
return new_list;
}
git_commit_list *git_commit_list_insert_by_date(git_commit_list_node *item, git_commit_list **list_p)
{
git_commit_list **pp = list_p;
git_commit_list *p;
while ((p = *pp) != NULL) {
if (git_commit_list_time_cmp(p->item, item) > 0)
break;
pp = &p->next;
}
return git_commit_list_insert(item, pp);
}
git_commit_list_node *git_commit_list_alloc_node(git_revwalk *walk)
{
return (git_commit_list_node *)git_pool_mallocz(&walk->commit_pool, 1);
}
static git_commit_list_node **alloc_parents(
git_revwalk *walk, git_commit_list_node *commit, size_t n_parents)
{
size_t bytes;
if (n_parents <= PARENTS_PER_COMMIT)
return (git_commit_list_node **)((char *)commit + sizeof(git_commit_list_node));
if (git__multiply_sizet_overflow(&bytes, n_parents, sizeof(git_commit_list_node *)))
return NULL;
return (git_commit_list_node **)git_pool_malloc(&walk->commit_pool, bytes);
}
void git_commit_list_free(git_commit_list **list_p)
{
git_commit_list *list = *list_p;
if (list == NULL)
return;
while (list) {
git_commit_list *temp = list;
list = temp->next;
git__free(temp);
}
*list_p = NULL;
}
git_commit_list_node *git_commit_list_pop(git_commit_list **stack)
{
git_commit_list *top = *stack;
git_commit_list_node *item = top ? top->item : NULL;
if (top) {
*stack = top->next;
git__free(top);
}
return item;
}
static int commit_quick_parse(
git_revwalk *walk,
git_commit_list_node *node,
git_odb_object *obj)
{
git_oid *parent_oid;
git_commit *commit;
int error;
size_t i;
commit = git__calloc(1, sizeof(*commit));
GIT_ERROR_CHECK_ALLOC(commit);
commit->object.repo = walk->repo;
if ((error = git_commit__parse_ext(commit, obj, GIT_COMMIT_PARSE_QUICK)) < 0) {
git__free(commit);
return error;
}
if (!git__is_uint16(git_array_size(commit->parent_ids))) {
git__free(commit);
git_error_set(GIT_ERROR_INVALID, "commit has more than 2^16 parents");
return -1;
}
node->generation = 0;
node->time = commit->committer->when.time;
node->out_degree = (uint16_t) git_array_size(commit->parent_ids);
node->parents = alloc_parents(walk, node, node->out_degree);
GIT_ERROR_CHECK_ALLOC(node->parents);
git_array_foreach(commit->parent_ids, i, parent_oid) {
node->parents[i] = git_revwalk__commit_lookup(walk, parent_oid);
}
git_commit__free(commit);
node->parsed = 1;
return 0;
}
int git_commit_list_parse(git_revwalk *walk, git_commit_list_node *commit)
{
git_odb_object *obj;
git_commit_graph_file *cgraph_file = NULL;
int error;
if (commit->parsed)
return 0;
/* Let's try to use the commit graph first. */
git_odb__get_commit_graph_file(&cgraph_file, walk->odb);
if (cgraph_file) {
git_commit_graph_entry e;
error = git_commit_graph_entry_find(&e, cgraph_file, &commit->oid, GIT_OID_RAWSZ);
if (error == 0 && git__is_uint16(e.parent_count)) {
size_t i;
commit->generation = (uint32_t)e.generation;
commit->time = e.commit_time;
commit->out_degree = (uint16_t)e.parent_count;
commit->parents = alloc_parents(walk, commit, commit->out_degree);
GIT_ERROR_CHECK_ALLOC(commit->parents);
for (i = 0; i < commit->out_degree; ++i) {
git_commit_graph_entry parent;
error = git_commit_graph_entry_parent(&parent, cgraph_file, &e, i);
if (error < 0)
return error;
commit->parents[i] = git_revwalk__commit_lookup(walk, &parent.sha1);
}
commit->parsed = 1;
return 0;
}
}
if ((error = git_odb_read(&obj, walk->odb, &commit->oid)) < 0)
return error;
if (obj->cached.type != GIT_OBJECT_COMMIT) {
git_error_set(GIT_ERROR_INVALID, "object is no commit object");
error = -1;
} else
error = commit_quick_parse(walk, commit, obj);
git_odb_object_free(obj);
return error;
}
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