Merge branch 'kb/fast-hashmap'

Improvements to our hash table to get it to meet the needs of the
msysgit fscache project, with some nice performance improvements.

* kb/fast-hashmap:
  name-hash: retire unused index_name_exists()
  hashmap.h: use 'unsigned int' for hash-codes everywhere
  test-hashmap.c: drop unnecessary #includes
  .gitignore: test-hashmap is a generated file
  read-cache.c: fix memory leaks caused by removed cache entries
  builtin/update-index.c: cleanup update_one
  fix 'git update-index --verbose --again' output
  remove old hash.[ch] implementation
  name-hash.c: remove cache entries instead of marking them CE_UNHASHED
  name-hash.c: use new hash map implementation for cache entries
  name-hash.c: remove unreferenced directory entries
  name-hash.c: use new hash map implementation for directories
  diffcore-rename.c: use new hash map implementation
  diffcore-rename.c: simplify finding exact renames
  diffcore-rename.c: move code around to prepare for the next patch
  buitin/describe.c: use new hash map implementation
  add a hashtable implementation that supports O(1) removal
  submodule: don't access the .gitmodules cache entry after removing it
This commit is contained in:
Junio C Hamano
2014-02-27 14:01:09 -08:00
20 changed files with 1218 additions and 540 deletions

240
t/t0011-hashmap.sh Executable file
View File

@ -0,0 +1,240 @@
#!/bin/sh
test_description='test hashmap and string hash functions'
. ./test-lib.sh
test_hashmap() {
echo "$1" | test-hashmap $3 > actual &&
echo "$2" > expect &&
test_cmp expect actual
}
test_expect_success 'hash functions' '
test_hashmap "hash key1" "2215982743 2215982743 116372151 116372151" &&
test_hashmap "hash key2" "2215982740 2215982740 116372148 116372148" &&
test_hashmap "hash fooBarFrotz" "1383912807 1383912807 3189766727 3189766727" &&
test_hashmap "hash foobarfrotz" "2862305959 2862305959 3189766727 3189766727"
'
test_expect_success 'put' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
put foobarfrotz value4
size" "NULL
NULL
NULL
NULL
64 4"
'
test_expect_success 'put (case insensitive)' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
size" "NULL
NULL
NULL
64 3" ignorecase
'
test_expect_success 'replace' '
test_hashmap "put key1 value1
put key1 value2
put fooBarFrotz value3
put fooBarFrotz value4
size" "NULL
value1
NULL
value3
64 2"
'
test_expect_success 'replace (case insensitive)' '
test_hashmap "put key1 value1
put Key1 value2
put fooBarFrotz value3
put foobarfrotz value4
size" "NULL
value1
NULL
value3
64 2" ignorecase
'
test_expect_success 'get' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
put foobarfrotz value4
get key1
get key2
get fooBarFrotz
get notInMap" "NULL
NULL
NULL
NULL
value1
value2
value3
NULL"
'
test_expect_success 'get (case insensitive)' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
get Key1
get keY2
get foobarfrotz
get notInMap" "NULL
NULL
NULL
value1
value2
value3
NULL" ignorecase
'
test_expect_success 'add' '
test_hashmap "add key1 value1
add key1 value2
add fooBarFrotz value3
add fooBarFrotz value4
get key1
get fooBarFrotz
get notInMap" "value2
value1
value4
value3
NULL"
'
test_expect_success 'add (case insensitive)' '
test_hashmap "add key1 value1
add Key1 value2
add fooBarFrotz value3
add foobarfrotz value4
get key1
get Foobarfrotz
get notInMap" "value2
value1
value4
value3
NULL" ignorecase
'
test_expect_success 'remove' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
remove key1
remove key2
remove notInMap
size" "NULL
NULL
NULL
value1
value2
NULL
64 1"
'
test_expect_success 'remove (case insensitive)' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
remove Key1
remove keY2
remove notInMap
size" "NULL
NULL
NULL
value1
value2
NULL
64 1" ignorecase
'
test_expect_success 'iterate' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
iterate" "NULL
NULL
NULL
key2 value2
key1 value1
fooBarFrotz value3"
'
test_expect_success 'iterate (case insensitive)' '
test_hashmap "put key1 value1
put key2 value2
put fooBarFrotz value3
iterate" "NULL
NULL
NULL
fooBarFrotz value3
key2 value2
key1 value1" ignorecase
'
test_expect_success 'grow / shrink' '
rm -f in &&
rm -f expect &&
for n in $(test_seq 51)
do
echo put key$n value$n >> in &&
echo NULL >> expect
done &&
echo size >> in &&
echo 64 51 >> expect &&
echo put key52 value52 >> in &&
echo NULL >> expect
echo size >> in &&
echo 256 52 >> expect &&
for n in $(test_seq 12)
do
echo remove key$n >> in &&
echo value$n >> expect
done &&
echo size >> in &&
echo 256 40 >> expect &&
echo remove key40 >> in &&
echo value40 >> expect &&
echo size >> in &&
echo 64 39 >> expect &&
cat in | test-hashmap > out &&
test_cmp expect out
'
test_done