зеркало из https://github.com/microsoft/git.git
commit: add generation number to struct commit
The generation number of a commit is defined recursively as follows: * If a commit A has no parents, then the generation number of A is one. * If a commit A has parents, then the generation number of A is one more than the maximum generation number among the parents of A. Add a uint32_t generation field to struct commit so we can pass this information to revision walks. We use three special values to signal the generation number is invalid: GENERATION_NUMBER_INFINITY 0xFFFFFFFF GENERATION_NUMBER_MAX 0x3FFFFFFF GENERATION_NUMBER_ZERO 0 The first (_INFINITY) means the generation number has not been loaded or computed. The second (_MAX) means the generation number is too large to store in the commit-graph file. The third (_ZERO) means the generation number was loaded from a commit graph file that was written by a version of git that did not support generation numbers. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Родитель
8fb572af5f
Коммит
83073cc994
1
alloc.c
1
alloc.c
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@ -94,6 +94,7 @@ void *alloc_commit_node(void)
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c->object.type = OBJ_COMMIT;
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c->index = alloc_commit_index();
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c->graph_pos = COMMIT_NOT_FROM_GRAPH;
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c->generation = GENERATION_NUMBER_INFINITY;
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return c;
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}
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@ -262,6 +262,8 @@ static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uin
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date_low = get_be32(commit_data + g->hash_len + 12);
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item->date = (timestamp_t)((date_high << 32) | date_low);
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item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
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pptr = &item->parents;
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edge_value = get_be32(commit_data + g->hash_len);
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4
commit.h
4
commit.h
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@ -10,6 +10,9 @@
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#include "pretty.h"
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#define COMMIT_NOT_FROM_GRAPH 0xFFFFFFFF
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#define GENERATION_NUMBER_INFINITY 0xFFFFFFFF
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#define GENERATION_NUMBER_MAX 0x3FFFFFFF
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#define GENERATION_NUMBER_ZERO 0
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struct commit_list {
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struct commit *item;
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@ -30,6 +33,7 @@ struct commit {
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*/
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struct tree *maybe_tree;
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uint32_t graph_pos;
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uint32_t generation;
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};
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extern int save_commit_buffer;
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