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https://github.com/git-for-windows/git.git
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The Git project is not exactly the easiest project to get started in: it's written in C and POSIX shell, with bits of Perl, Rust and other languages sprinkled into it. On top of that, the project has grown somewhat organically over time, making the codebase hard to navigate. These are problems that we're aware of, and there have been and still are efforts to clean up some of the technical debt that is natural to exist an a project that is more than 20 years old. Furthermore, we provide resources to newcomers that help them out like our coding guidelines, code of conduct or "MyFirstContribution.adoc". But there is a rather practical problem: finding your way around in our project's tree is not easy. Doing a directory listing in the top-level directory will present you with more than 550 files, which makes it extremely hard for a newcomer to figure out what files they are even supposed to look at. This makes the onboarding experience somewhat harder than it really needs to be. This isn't only a problem for newcomers though, as I myself struggle to find the files I am looking for because of the sheer number of files. Besides the problem of discoverability it also creates a problem of structure. It is not obvious at all which files are part of "libgit.a" and which files are only linked into our final executables. So while we have this split in our build systems, that split is not evident at all in our tree. Introduce a new "lib/" directory and move all of our sources for "libgit.a" into it to fix these issues. It makes the split we have evident and reduces the number of files in our top-level tree from 550 files to ~80 files. This is still a lot of files, but it's significantly easier to navigate already. Furthermore, we can further iterate after this step and think about introducing a better structure for remaining files, as well. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
/*
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* alloc.c - specialized allocator for internal objects
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*
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* Copyright (C) 2006 Linus Torvalds
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*
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* The standard malloc/free wastes too much space for objects, partly because
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* it maintains all the allocation infrastructure, but even more because it ends
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* up with maximal alignment because it doesn't know what the object alignment
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* for the new allocation is.
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*/
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#include "git-compat-util.h"
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#include "object.h"
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#include "blob.h"
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#include "tree.h"
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#include "commit.h"
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#include "repository.h"
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#include "tag.h"
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#include "alloc.h"
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#define BLOCKING 1024
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union any_object {
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struct object object;
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struct blob blob;
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struct tree tree;
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struct commit commit;
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struct tag tag;
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};
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struct alloc_state {
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int nr; /* number of nodes left in current allocation */
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void *p; /* first free node in current allocation */
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/* bookkeeping of allocations */
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void **slabs;
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int slab_nr, slab_alloc;
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};
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struct alloc_state *alloc_state_alloc(void)
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{
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return xcalloc(1, sizeof(struct alloc_state));
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}
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void alloc_state_free_and_null(struct alloc_state **s_)
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{
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struct alloc_state *s = *s_;
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if (!s)
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return;
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while (s->slab_nr > 0) {
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s->slab_nr--;
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free(s->slabs[s->slab_nr]);
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}
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FREE_AND_NULL(s->slabs);
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FREE_AND_NULL(*s_);
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}
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static inline void *alloc_node(struct alloc_state *s, size_t node_size)
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{
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void *ret;
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if (!s->nr) {
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s->nr = BLOCKING;
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s->p = xmalloc(BLOCKING * node_size);
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ALLOC_GROW(s->slabs, s->slab_nr + 1, s->slab_alloc);
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s->slabs[s->slab_nr++] = s->p;
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}
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s->nr--;
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ret = s->p;
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s->p = (char *)s->p + node_size;
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memset(ret, 0, node_size);
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return ret;
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}
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void *alloc_blob_node(struct repository *r)
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{
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struct blob *b = alloc_node(r->parsed_objects->blob_state, sizeof(struct blob));
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b->object.type = OBJ_BLOB;
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return b;
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}
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void *alloc_tree_node(struct repository *r)
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{
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struct tree *t = alloc_node(r->parsed_objects->tree_state, sizeof(struct tree));
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t->object.type = OBJ_TREE;
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return t;
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}
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void *alloc_tag_node(struct repository *r)
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{
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struct tag *t = alloc_node(r->parsed_objects->tag_state, sizeof(struct tag));
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t->object.type = OBJ_TAG;
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return t;
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}
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void *alloc_object_node(struct repository *r)
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{
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struct object *obj = alloc_node(r->parsed_objects->object_state, sizeof(union any_object));
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obj->type = OBJ_NONE;
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return obj;
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}
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/*
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* The returned count is to be used as an index into commit slabs,
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* that are *NOT* maintained per repository, and that is why a single
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* global counter is used.
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*/
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static unsigned int alloc_commit_index(void)
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{
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static unsigned int parsed_commits_count;
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return parsed_commits_count++;
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}
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void init_commit_node(struct commit *c)
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{
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c->object.type = OBJ_COMMIT;
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c->index = alloc_commit_index();
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}
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void *alloc_commit_node(struct repository *r)
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{
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struct commit *c = alloc_node(r->parsed_objects->commit_state, sizeof(struct commit));
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init_commit_node(c);
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return c;
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}
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