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2006-12-20simplify inclusion of system header files.Libravatar Junio C Hamano1-1/+0
This is a mechanical clean-up of the way *.c files include system header files. (1) sources under compat/, platform sha-1 implementations, and xdelta code are exempt from the following rules; (2) the first #include must be "git-compat-util.h" or one of our own header file that includes it first (e.g. config.h, builtin.h, pkt-line.h); (3) system headers that are included in "git-compat-util.h" need not be included in individual C source files. (4) "git-compat-util.h" does not have to include subsystem specific header files (e.g. expat.h). Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-08-23Convert memcpy(a,b,20) to hashcpy(a,b).Libravatar Shawn Pearce1-1/+1
This abstracts away the size of the hash values when copying them from memory location to memory location, much as the introduction of hashcmp abstracted away hash value comparsion. A few call sites were using char* rather than unsigned char* so I added the cast rather than open hashcpy to be void*. This is a reasonable tradeoff as most call sites already use unsigned char* and the existing hashcmp is also declared to be unsigned char*. [jc: Splitted the patch to "master" part, to be followed by a patch for merge-recursive.c which is not in "master" yet. Fixed the cast in the latter hunk to combine-diff.c which was wrong in the original. Also converted ones left-over in combine-diff.c, diff-lib.c and upload-pack.c ] Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-08-14Make track_tree_refs void.Libravatar David Rientjes1-2/+1
Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-07-12Remove TYPE_* constant macros and use object_type enums consistently.Libravatar Linus Torvalds1-6/+6
This updates the type-enumeration constants introduced to reduce the memory footprint of "struct object" to match the type bits already used in the packfile format, by removing the former (i.e. TYPE_* constant macros) and using the latter (i.e. enum object_type) throughout the code for consistency. Eventually we can stop passing around the "type strings" entirely, and this will help - no confusion about two different integer enumeration. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-19Add specialized object allocatorLibravatar Linus Torvalds1-1/+1
This creates a simple specialized object allocator for basic objects. This avoids wasting space with malloc overhead (metadata and extra alignment), since the specialized allocator knows the alignment, and that objects, once allocated, are never freed. It also allows us to track some basic statistics about object allocations. For example, for the mozilla import, it shows object usage as follows: blobs: 627629 (14710 kB) trees: 1119035 (34969 kB) commits: 196423 (8440 kB) tags: 1336 (46 kB) and the simpler allocator shaves off about 2.5% off the memory footprint off a "git-rev-list --all --objects", and is a bit faster too. [ Side note: this concludes the series of "save memory in object storage". The thing is, there simply isn't much more to be saved on the objects. Doing "git-rev-list --all --objects" on the mozilla archive has a final total RSS of 131498 pages for me: that's about 513MB. Of that, the object overhead is now just 56MB, the rest is going somewhere else (put another way: the fact that this patch shaves off 2.5% of the total memory overhead, considering that objects are now not much more than 10% of the total shows how big the wasted space really was: this makes object allocations much more memory- and time-efficient). I haven't looked at where the rest is, but I suspect the bulk of it is just the pack-file loading. It may be that we should pack the tree objects separately from the blob objects: for git-rev-list --objects, we don't actually ever need to even look at the blobs, but since trees and blobs are interspersed in the pack-file, we end up not being dense in the tree accesses, so we end up looking at more pages than we strictly need to. So with a 535MB pack-file, it's entirely possible - even likely - that most of the remaining RSS is just the mmap of the pack-file itself. We don't need to map in _all_ of it, but we do end up mapping a fair amount. ] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-17Shrink "struct object" a bitLibravatar Linus Torvalds1-8/+8
This shrinks "struct object" by a small amount, by getting rid of the "struct type *" pointer and replacing it with a 3-bit bitfield instead. In addition, we merge the bitfields and the "flags" field, which incidentally should also remove a useless 4-byte padding from the object when in 64-bit mode. Now, our "struct object" is still too damn large, but it's now less obviously bloated, and of the remaining fields, only the "util" (which is not used by most things) is clearly something that should be eventually discarded. This shrinks the "git-rev-list --all" memory use by about 2.5% on the kernel archive (and, perhaps more importantly, on the larger mozilla archive). That may not sound like much, but I suspect it's more on a 64-bit platform. There are other remaining inefficiencies (the parent lists, for example, probably have horrible malloc overhead), but this was pretty obvious. Most of the patch is just changing the comparison of the "type" pointer from one of the constant string pointers to the appropriate new TYPE_xxx small integer constant. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-30tree_entry(): new tree-walking helper functionLibravatar Linus Torvalds1-26/+15
This adds a "tree_entry()" function that combines the common operation of doing a "tree_entry_extract()" + "update_tree_entry()". It also has a simplified calling convention, designed for simple loops that traverse over a whole tree: the arguments are pointers to the tree descriptor and a name_entry structure to fill in, and it returns a boolean "true" if there was an entry left to be gotten in the tree. This allows tree traversal with struct tree_desc desc; struct name_entry entry; desc.buf = tree->buffer; desc.size = tree->size; while (tree_entry(&desc, &entry) { ... use "entry.{path, sha1, mode, pathlen}" ... } which is not only shorter than writing it out in full, it's hopefully less error prone too. [ It's actually a tad faster too - we don't need to recalculate the entry pathlength in both extract and update, but need to do it only once. Also, some callers can avoid doing a "strlen()" on the result, since it's returned as part of the name_entry structure. However, by now we're talking just 1% speedup on "git-rev-list --objects --all", and we're definitely at the point where tree walking is no longer the issue any more. ] NOTE! Not everybody wants to use this new helper function, since some of the tree walkers very much on purpose do the descriptor update separately from the entry extraction. So the "extract + update" sequence still remains as the core sequence, this is just a simplified interface. We should probably add a silly two-line inline helper function for initializing the descriptor from the "struct tree" too, just to cut down on the noise from that common "desc" initializer. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-29Remove last vestiges of generic tree_entry_listLibravatar Linus Torvalds1-42/+0
The old tree_entry_list is dead, long live the unified single tree parser. Yes, we now still have a compatibility function to create a bogus tree_entry_list in builtin-read-tree.c, but that is now entirely local to that very messy piece of code. I'd love to clean read-tree.c up too, but I'm too scared right now, so the best I can do is to just contain the damage, and try to make sure that no new users of the tree_entry_list sprout up by not having it as an exported interface any more. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-29Remove unused "zeropad" entry from tree_list_entryLibravatar Linus Torvalds1-2/+1
That was a hack, only needed because 'git fsck-objects' didn't look at the raw tree format. Now that fsck traverses the tree itself, we can drop it. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-29Remove "tree->entries" tree-entry list from tree parserLibravatar Linus Torvalds1-24/+57
Instead, just use the tree buffer directly, and use the tree-walk infrastructure to walk the buffers instead of the tree-entry list. The tree-entry list is inefficient, and generates tons of small allocations for no good reason. The tree-walk infrastructure is generally no harder to use than following a linked list, and allows us to do most tree parsing in-place. Some programs still use the old tree-entry lists, and are a bit painful to convert without major surgery. For them we have a helper function that creates a temporary tree-entry list on demand. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-29Switch "read_tree_recursive()" over to tree-walk functionalityLibravatar Linus Torvalds1-13/+20
Don't use the tree_entry list any more. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-29Make "tree_entry" have a SHA1 instead of a union of object pointersLibravatar Linus Torvalds1-11/+14
This is preparatory work for further cleanups, where we try to make tree_entry look more like the more efficient tree-walk descriptor. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-29Make "struct tree" contain the pointer to the tree bufferLibravatar Linus Torvalds1-25/+22
This allows us to avoid allocating information for names etc, because we can just use the information from the tree buffer directly. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-04Replace xmalloc+memset(0) with xcalloc.Libravatar Peter Eriksen1-5/+2
Signed-off-by: Peter Eriksen <s022018@student.dtu.dk> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-01-26Only use a single parser for tree objectsLibravatar Daniel Barkalow1-30/+18
This makes read_tree_recursive and read_tree take a struct tree instead of a buffer. It also move the declaration of read_tree into tree.h (where struct tree is defined), and updates ls-tree and diff-index (the only places that presently use read_tree*()) to use the new versions. Signed-off-by: Daniel Barkalow <barkalow@iabervon.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-01-07[PATCH] Compilation: zero-length array declaration.Libravatar Junio C Hamano1-1/+1
ISO C99 (and GCC 3.x or later) lets you write a flexible array at the end of a structure, like this: struct frotz { int xyzzy; char nitfol[]; /* more */ }; GCC 2.95 and 2.96 let you to do this with "char nitfol[0]"; unfortunately this is not allowed by ISO C90. This declares such construct like this: struct frotz { int xyzzy; char nitfol[FLEX_ARRAY]; /* more */ }; and git-compat-util.h defines FLEX_ARRAY to 0 for gcc 2.95 and empty for others. If you are using a C90 C compiler, you should be able to override this with CFLAGS=-DFLEX_ARRAY=1 from the command line of "make". Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-12-04struct tree: remove unused field "parent"Libravatar Junio C Hamano1-1/+0
The field is not used anymore, after the recent ls-tree rewrite. Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-11-28ls-tree: major rewrite to do pathspecLibravatar Linus Torvalds1-10/+24
git-ls-tree should be rewritten to use a pathspec the same way everybody else does. Right now it's the odd man out: if you do git-ls-tree HEAD divers/char drivers/ it will show the same files _twice_, which is not how pathspecs in general work. How about this patch? It breaks some of the git-ls-tree tests, but it makes git-ls-tree work a lot more like other git pathspec commands, and it removes more than 150 lines by re-using the recursive tree traversal (but the "-d" flag is gone for good, so I'm not pushing this too hard). Linus
2005-11-15Rework object refs tracking to reduce memory usageLibravatar Sergey Vlasov1-1/+12
Store pointers to referenced objects in a variable sized array instead of linked list. This cuts down memory usage of utilities which use object references; e.g., git-fsck-objects --full on the git.git repository consumes about 2 MB of memory tracked by Massif instead of 7 MB before the change. Object refs are still the biggest consumer of memory (57%), but the malloc overhead for a single block instead of a linked list is substantially smaller. Signed-off-by: Sergey Vlasov <vsu@altlinux.ru> Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-09-10[PATCH] Add a function for getting a struct tree for an ent.Libravatar Daniel Barkalow1-0/+21
Signed-off-by: Daniel Barkalow <barkalow@iabervon.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-07-27git-fsck-cache: be stricter about "tree" objectsLibravatar Linus Torvalds1-0/+1
In particular, warn about things like zero-padding of the mode bits, which is a big no-no, since it makes otherwise identical trees have different representations (and thus different SHA1 numbers). Also make the warnings more regular. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-14Fix up read_tree() pathspec matching to use "const char **"Libravatar Linus Torvalds1-4/+6
The same way the other pathspecs work. Also fix missing success return from the matching - not that anything actually uses this yet ;)
2005-07-14Start adding interfaces to read in partial treesLibravatar Linus Torvalds1-4/+51
The same way "git-diff-tree" can limit its output to just a set of matches, we can read in just a partial tree for comparison purposes.
2005-06-25[PATCH] Fix oversimplified optimization for add_cache_entry().Libravatar Junio C Hamano1-1/+1
An earlier change to optimize directory-file conflict check broke what "read-tree --emu23" expects. This is fixed by this commit. (1) Introduces an explicit flag to tell add_cache_entry() not to check for conflicts and use it when reading an existing tree into an empty stage --- by definition this case can never introduce such conflicts. (2) Makes read-cache.c:has_file_name() and read-cache.c:has_dir_name() aware of the cache stages, and flag conflict only with paths in the same stage. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-08[PATCH] Anal retentive 'const unsigned char *sha1'Libravatar Jason McMullan1-1/+1
Make 'sha1' parameters const where possible Signed-off-by: Jason McMullan <jason.mcmullan@timesys.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-29[PATCH] Rewrite ls-tree to behave more like "/bin/ls -a"Libravatar Junio C Hamano1-1/+1
This is a complete rewrite of ls-tree to make it behave more like what "/bin/ls -a" does in the current working directory. Namely, the changes are: - Unlike the old ls-tree behaviour that used paths arguments to restrict output (not that it worked as intended---as pointed out in the mailing list discussion, it was quite incoherent), this rewrite uses paths arguments to specify what to show. - Without arguments, it implicitly uses the root level as its sole argument ("/bin/ls -a" behaves as if "." is given without argument). - Without -r (recursive) flag, it shows the named blob (either file or symlink), or the named tree and its immediate children. - With -r flag, it shows the named path, and recursively descends into it if it is a tree. - With -d flag, it shows the named path and does not show its children even if the path is a tree, nor descends into it recursively. This is still request-for-comments patch. There is no mailing list consensus that this proposed new behaviour is a good one. The patch to t/t3100-ls-tree-restrict.sh illustrates user-visible behaviour changes. Namely: * "git-ls-tree $tree path1 path0" lists path1 first and then path0. It used to use paths as an output restrictor and showed output in cache entry order (i.e. path0 first and then path1) regardless of the order of paths arguments. * "git-ls-tree $tree path2" lists path2 and its immediate children but having explicit paths argument does not imply recursive behaviour anymore, hence paths/baz is shown but not paths/baz/b. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-20[PATCH] delta checkLibravatar Nicolas Pitre1-0/+2
This adds knowledge of delta objects to fsck-cache and various object parsing code. A new switch to git-fsck-cache is provided to display the maximum delta depth found in a repository. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-11[PATCH] read_tree_recursive(): Fix leaksLibravatar Jonas Fonseca1-2/+5
Fix two potential leaks. Signed-off-by: Jonas Fonseca <fonseca@diku.dk> Signed-off-by: Petr Baudis <pasky@ucw.cz>
2005-05-07Add git-update-cache --replace option.Libravatar Junio C Hamano1-1/+1
When "path" exists as a file or a symlink in the index, an attempt to add "path/file" is refused because it results in file vs directory conflict. Similarly when "path/file1", "path/file2", etc. exist, an attempt to add "path" as a file or a symlink is refused. With git-update-cache --replace, these existing entries that conflict with the entry being added are automatically removed from the cache, with warning messages. Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-05-06[PATCH] don't load and decompress objects twice with parse_object()Libravatar Nicolas Pitre1-17/+27
It turns out that parse_object() is loading and decompressing given object to free it just before calling the specific object parsing function which does mmap and decompress the same object again. This patch introduces the ability to parse specific objects directly from a memory buffer. Without this patch, running git-fsck-cache on the kernel repositorytake: real 0m13.006s user 0m11.421s sys 0m1.218s With this patch applied: real 0m8.060s user 0m7.071s sys 0m0.710s The performance increase is significant, and this is kind of a prerequisite for sane delta object support with fsck. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-05Be more careful about tree entry modes.Libravatar Linus Torvalds1-2/+4
The tree object parsing used to get the executable bit wrong, and didn't know about symlinks. Also, fsck really wants the full mode value so that it can verify the other bits for sanity, so save it all in struct tree_entry.
2005-05-04[PATCH] Fix memory leaks in git-fsck-cacheLibravatar Sergey Vlasov1-2/+7
This patch fixes memory leaks in parse_object() and related functions; these leaks were very noticeable when running git-fsck-cache. Signed-off-by: Sergey Vlasov <vsu@altlinux.ru> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-02Make fsck-cache do better tree checking.Libravatar Linus Torvalds1-5/+0
We check the ordering of the entries, and we verify that none of the entries has a slash in it (this allows us to remove the hacky "has_full_path" member from the tree structure, since we now just test it by walking the tree entries instead).
2005-04-26[PATCH] introduce xmalloc and xreallocLibravatar Christopher Li1-4/+4
Introduce xmalloc and xrealloc to die gracefully with a descriptive message when out of memory, rather than taking a SIGSEGV. Signed-off-by: Christopher Li<chrislgit@chrisli.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-24Don't add references to objects we couldn't find. Libravatar Linus Torvalds1-1/+2
That would SIGSEGV.
2005-04-24Verify that the object type matches for tree/commit objects even before parsing.Libravatar Linus Torvalds1-1/+1
The type doesn't come from the parsing, the type also has to match the usage.
2005-04-24Set object type at object creation time, not object parse time.Libravatar Linus Torvalds1-1/+1
Otherwise we can have objects without a type, which is not good.
2005-04-23[PATCH] Parse tree objects completelyLibravatar Daniel Barkalow1-3/+17
This adds the contents of trees to struct tree. Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-22Move "read_tree()" to "tree.c" to be used as a generic helper function.Libravatar Linus Torvalds1-0/+65
Next step: make "diff-cache" use it.
2005-04-18[PATCH] Implementations of parsing functionsLibravatar Daniel Barkalow1-0/+67
This implements the parsing functions. Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>