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94f7d2549fbb9437dc8b41d07a2d07232c806e77
littlefs/tests/test_btree.toml
T
Christopher Haster 94f7d2549f Changed rbyd/btree namelookups to only compare raw bytes 
This is a simplification of the rbyd/btree layers, but implies
behavioral changes to the mtree/mdir layers.

Instead of ordering by leb128 did + name:

  82 02 61 61 61  <  81 04 62 62 62
  (0x102, "aaa")     (0x201, "bbb")

We now order by the raw encoding, lexicographically:

  82 02 61 61 61  >  81 04 62 62 62
  (0x102, "aaa")     (0x201, "bbb")

This may be unintuitive, but note:

1. Files _within_ a directory are still ordered, since they share a did
   prefix.

2. We don't really care about the relative ordering of dids, just
   that they are unique. Changing the ordering at this level does not
   interfere with any of our did-related functions.

3. The only thing we may care about is that the root, did=0, is the
   first mtree entry. This is still true. No leb128 encoding is < 0x00
   even after encoding.

The motivation for this change is to allow for other named-btrees in the
system that may used non-did-prefixed names. At least one of these makes
sense for a sort of "content-tree" (cksum -> data block mapping).

As a plus, this change makes it possible to compare names and do btree
namelookups without needing to decode the leb128 prefix. Although I'm
struggling a bit to figure out exactly where this is useful...

One downside, this ordering only works if dids are always stored in
their canonical encoding, that is, the smallest leb128 encoding possible
for a given did. I think this is a reasonable requirement for just our
dids.

Another downside is this did add a decent chunk of code.

I did try limiting the changes to lfsr_data_namecmp, but it didn't have
much impact. I guess most of the cost comes from the reworked
lfsr_data_cmp function, which, to be fair, is quite a bit more
complicated now (it now supports limited data<=>data comparisons):

            code          stack
  before:  34148           2896
  namecmp: 34324 (+0.5%)   2896 (+0.0%)
  after:   34340 (+0.6%)   2896 (+0.0%)
2024-02-23 17:00:19 -06:00

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# Test the mid-level B-trees
after = 'test_rbyd'
# maximize lookahead buffer, we don't actually gc so we only get one pass
# of the disk for these tests
defines.LOOKAHEAD_SIZE = 'lfs_alignup(BLOCK_COUNT / 8, 8)'
# test an empty tree
[cases.test_btree_zero]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create an empty tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 0);
// try looking up tags
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
# test an inlined tree
[cases.test_btree_one]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a single-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
# test a single-rbyd tree
[cases.test_btree_two]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 2);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_two_backwards]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 2);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
# still a single-rbyd tree, just making sure it works
[cases.test_btree_three]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 2, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("c", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 3);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "c", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 3,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_three_backwards]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("c", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 3);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "c", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 3,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
# try larger trees, when exactly a tree splits depends on the disk geometry, so
# we don't really have a better way of testing multi-rbyd trees
[cases.test_btree_push]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfs_size_t n = 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, n,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_push_backwards]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfs_size_t n = 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+((N-1-i) % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookup(&lfs, &btree, n-1-i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'a'+((N-1-i) % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, n,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_push_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t sim_size = 0;
memset(sim, 0, N);
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % (sim_size+1);
// add to btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// add to sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
sim[bid] = 'a'+(i % 26);
sim_size += 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%c", sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, sim_size,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
lfs_deinit(&lfs) => 0;
'''
[cases.test_btree_push_sparse]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.W = 5
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfs_size_t n = 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i*W, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +W,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n*W);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookup(&lfs, &btree, i*W+W-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, n*W,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == i*W+W-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_push_sparse_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.W = 5
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t *sim_weights = malloc(N*sizeof(lfs_size_t));
lfs_size_t sim_size = 0;
memset(sim, 0, N);
memset(sim_weights, 0, N*sizeof(lfs_size_t));
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % (sim_size+1);
// choose a pseudo-random weight
lfs_size_t weight = 1 + (TEST_PRNG(&prng) % W);
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < bid; j++) {
weighted_bid += sim_weights[j];
}
// add to btree
int err = lfsr_btree_commit(&lfs, &btree, weighted_bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +weight,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// add to sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
memmove(&sim_weights[bid+1], &sim_weights[bid],
(sim_size-bid)*sizeof(lfs_size_t));
sim[bid] = 'a'+(i % 26);
sim_weights[bid] = weight;
sim_size += 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
if (!first) {
printf(", ");
}
first = false;
printf("%dw%d=%c", weighted_bid+sim_weights[i]-1,
sim_weights[i], sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookup(&lfs, &btree, weighted_bid+sim_weights[i]-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, total_weight,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == weighted_bid+sim_weights[i]-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
# test btree updates
# try some small trees for easy corner cases first
[cases.test_btree_update_one]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a single-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
// update the tree
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("A", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "A", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_update_two]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
// update the tree
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("A", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("B", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 2);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "A", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "B", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_update_three]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 2, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("c", 1)))) => 0;
// update the tree
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("A", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("B", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 2, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("C", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 3);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "A", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "B", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "C", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 3,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_update]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// update the tree
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'A'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == N);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < N; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'A'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, N,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_update_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.SAMPLES = 10
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
for (lfs_size_t i = 0; i < N; i++) {
sim[i] = 'a'+(i % 26);
}
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % N;
// update btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'A'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// update sim
sim[bid] = 'A'+(i % 26);
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < N; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%c", sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == N);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < N; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, N,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
[cases.test_btree_update_sparse]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.W = 5
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i*W, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +W,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// update the tree
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i*W+W-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'A'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == N*W);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < N; i++) {
lfsr_btree_lookup(&lfs, &btree, i*W+W-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
assert(memcmp(buffer, &(uint8_t){'A'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, N*W,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < N; i++) {
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == i*W+W-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &(uint8_t){'A'+(i % 26)}, 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_update_sparse_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.W = 5
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i*W, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +W,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t *sim_weights = malloc(N*sizeof(lfs_size_t));
for (lfs_size_t i = 0; i < N; i++) {
sim[i] = 'a'+(i % 26);
sim_weights[i] = W;
}
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % N;
// choose a pseudo-random weight
lfs_size_t weight = 1 + (TEST_PRNG(&prng) % W);
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < bid; j++) {
weighted_bid += sim_weights[j];
}
// update btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'A'+(i % 26)}, 1)),
LFSR_ATTR(
LFSR_TAG_GROW, +weight-sim_weights[bid],
LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// update sim
sim[bid] = 'A'+(i % 26);
sim_weights[bid] = weight;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < N; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
if (!first) {
printf(", ");
}
first = false;
printf("%dw%d=%c", weighted_bid+sim_weights[i]-1,
sim_weights[i], sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < N; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < N; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookup(&lfs, &btree, weighted_bid+sim_weights[i]-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, total_weight,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < N; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == weighted_bid+sim_weights[i]-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
# test btree pops
# try some corner cases first, these are actually pretty tricky since we
# need to recognize when to collapse back into an inlined tree
[cases.test_btree_pop_one]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a single-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
// pop!
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 0);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// try to putting it back to see if things still work
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("A", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// try looking up tags
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "A", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_pop_two]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a single-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
// pop!
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// try to putting it back to see if things still work
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("B", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 2);
// try looking up tags
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "B", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_pop_two_other]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a single-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
// pop!
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// try to putting it back to see if things still work
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("A", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 2);
// try looking up tags
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "A", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_pop_three]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a single-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("b", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 2, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("c", 1)))) => 0;
// pop!
lfsr_btree_commit(&lfs, &btree, 2, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 2);
// try looking up tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// try to putting it back to see if things still work
lfsr_btree_commit(&lfs, &btree, 2, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("C", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 3);
// try looking up tags
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "a", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "b", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 2,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "C", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, 3,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_pop]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.REMAINING = [64, 2, 1, 0]
if = 'N > REMAINING'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// drain the tree
for (lfs_size_t i = 0; i < N-REMAINING; i++) {
int err = lfsr_btree_commit(&lfs, &btree, N-1-i, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == REMAINING);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < REMAINING; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, REMAINING,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// try recovering
lfsr_btree_commit(&lfs, &btree, REMAINING, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("R", 1)))) => 0;
for (lfs_size_t i = 0; i < REMAINING; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
lfsr_btree_lookup(&lfs, &btree, REMAINING,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "R", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, REMAINING+1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_pop_backwards]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.REMAINING = [64, 2, 1, 0]
if = 'N > REMAINING'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// drain the tree
for (lfs_size_t i = 0; i < N-REMAINING; i++) {
int err = lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == REMAINING);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < REMAINING; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer,
&(uint8_t){'a'+((i+(N-REMAINING)) % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, REMAINING,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// try recovering
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("R", 1)))) => 0;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, "R", 1) == 0);
for (lfs_size_t i = 0; i < REMAINING; i++) {
lfsr_btree_lookup(&lfs, &btree, i+1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer,
&(uint8_t){'a'+((i+(N-REMAINING)) % 26)}, 1) == 0);
}
lfsr_btree_lookup(&lfs, &btree, REMAINING+1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_pop_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.REMAINING = [64, 2, 1, 0]
defines.SEED = 'range(10)'
if = 'N > REMAINING'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t sim_size = N;
for (lfs_size_t i = 0; i < N; i++) {
sim[i] = 'a'+(i % 26);
}
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < (N-REMAINING); i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % sim_size;
// remove from btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// remove from sim
memmove(&sim[bid], &sim[bid+1], sim_size-(bid+1));
sim_size -= 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%c", sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, sim_size,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
[cases.test_btree_pop_sparse]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.W = 5
defines.REMAINING = [64, 2, 1, 0]
if = 'N > REMAINING'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i*W, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +W,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
// drain the tree
for (lfs_size_t i = 0; i < N-REMAINING; i++) {
int err = lfsr_btree_commit(&lfs, &btree, (N-1-i)*W+W-1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -W, LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == REMAINING*W);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < REMAINING; i++) {
lfsr_btree_lookup(&lfs, &btree, i*W+W-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, REMAINING*W+W-1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// try recovering
lfsr_btree_commit(&lfs, &btree, REMAINING*W, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +W, LFSR_DATA_BUF("R", 1)))) => 0;
for (lfs_size_t i = 0; i < REMAINING; i++) {
lfsr_btree_lookup(&lfs, &btree, i*W+W-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
lfsr_btree_lookup(&lfs, &btree, REMAINING*W+W-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
assert(memcmp(buffer, "R", 1) == 0);
lfsr_btree_lookup(&lfs, &btree, (REMAINING+1)*W+W-1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < REMAINING; i++) {
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == i*W+W-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == REMAINING*W+W-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "R", 1) == 0);
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_pop_sparse_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.W = 5
defines.REMAINING = [64, 2, 1, 0]
defines.SEED = 'range(10)'
if = 'N > REMAINING'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t *sim_weights = malloc(N*sizeof(lfs_size_t));
lfs_size_t sim_size = 0;
// set up simulation and btree with pseudo-random weights
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random weight
lfs_size_t weight = 1 + (TEST_PRNG(&prng) % W);
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
int err = lfsr_btree_commit(&lfs, &btree, weighted_bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +weight,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
return;
}
assert(err == 0);
sim[i] = 'a'+(i % 26);
sim_weights[i] = weight;
sim_size += 1;
}
for (lfs_size_t i = 0; i < (N-REMAINING); i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % sim_size;
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < bid; j++) {
weighted_bid += sim_weights[j];
}
// remove from btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_RM, -sim_weights[bid],
LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// remove from sim
memmove(&sim[bid], &sim[bid+1], sim_size-(bid+1));
memmove(&sim_weights[bid], &sim_weights[bid+1],
(sim_size-(bid+1))*sizeof(lfs_size_t));
sim_size -= 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
if (!first) {
printf(", ");
}
first = false;
printf("%dw%d=%c", weighted_bid+sim_weights[i]-1,
sim_weights[i], sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookup(&lfs, &btree, weighted_bid+sim_weights[i]-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, total_weight,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == weighted_bid+sim_weights[i]-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
# test btree splits
[cases.test_btree_split]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(0 % 26)}, 1)))) => 0;
lfs_size_t n = 1;
for (lfs_size_t i = 1; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'a'+((i-1) % 26)}, 1)),
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+((i-0) % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, n,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_split_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("_", 1)))) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t sim_size = 1;
memset(sim, 0, N);
sim[0] = '_';
uint32_t prng = SEED;
for (lfs_size_t i = 1; i < N; i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % sim_size;
// split btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1)),
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'A'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// split sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
sim[bid+0] = 'a'+(i % 26);
sim[bid+1] = 'A'+(i % 26);
sim_size += 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%c", sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, sim_size,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
lfs_deinit(&lfs) => 0;
'''
[cases.test_btree_split_sparse]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.W = 5
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +W,
LFSR_DATA_BUF(&(uint8_t){'a'+(0 % 26)}, 1)))) => 0;
lfs_size_t n = 1;
for (lfs_size_t i = 1; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, (i-1)*W+W-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'a'+((i-1) % 26)}, 1)),
LFSR_ATTR(
LFSR_TAG_DATA, +W,
LFSR_DATA_BUF(&(uint8_t){'a'+((i-0) % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n*W);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookup(&lfs, &btree, i*W+W-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == W);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, n*W,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_split_sparse_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.W = 5
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +W, LFSR_DATA_BUF("_", 1)))) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t *sim_weights = malloc(N*sizeof(lfs_size_t));
lfs_size_t sim_size = 1;
memset(sim, 0, N);
memset(sim_weights, 0, N*sizeof(lfs_size_t));
sim[0] = '_';
sim_weights[0] = W;
uint32_t prng = SEED;
for (lfs_size_t i = 1; i < N; i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % sim_size;
// choose pseudo-random weights
lfs_size_t weight1 = 1 + (TEST_PRNG(&prng) % W);
lfs_size_t weight2 = 1 + (TEST_PRNG(&prng) % W);
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < bid; j++) {
weighted_bid += sim_weights[j];
}
// split btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_GROW, +weight1-sim_weights[bid],
LFSR_DATA_NULL()),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1)),
LFSR_ATTR(
LFSR_TAG_DATA, +weight2,
LFSR_DATA_BUF(&(uint8_t){'A'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// add to sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
memmove(&sim_weights[bid+1], &sim_weights[bid],
(sim_size-bid)*sizeof(lfs_size_t));
sim[bid+0] = 'a'+(i % 26);
sim[bid+1] = 'A'+(i % 26);
sim_weights[bid+0] = weight1;
sim_weights[bid+1] = weight2;
sim_size += 1;
// TODO rm
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookup(&lfs, &btree, weighted_bid+sim_weights[i]-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
if (!first) {
printf(", ");
}
first = false;
printf("%dw%d=%c", weighted_bid+sim_weights[i]-1,
sim_weights[i], sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookup(&lfs, &btree, weighted_bid+sim_weights[i]-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, total_weight,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == weighted_bid+sim_weights[i]-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
# Some specific corner cases
[cases.test_btree_drop]
# this should large enough so only one entry can fit in a block
defines.SIZE = 'BLOCK_SIZE / 4'
defines.SIBLING = [0, 1]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// force it to split
// the extra push here avoids trying to inline the big entry
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("_", 1)))) => 0;
uint8_t buf1[SIZE];
memset(buf1, 'a', SIZE);
uint8_t buf2[SIZE];
memset(buf2, 'b', SIZE);
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF(buf1, SIZE)),
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF(buf2, SIZE)))) => 0;
// force compaction
btree.eoff = -1;
memset(buf2, 'b', SIZE);
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(buf2, SIZE)))) => 0;
assert(btree.weight == 2);
// now remove one entry, since this brings the rbyd down to zero,
// this should force one of the blocks to drop
lfsr_btree_commit(&lfs, &btree, SIBLING, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// check that our other entry is fine
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buf1, SIZE) => SIZE;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buf1, ((SIBLING) ? "a" : "b"), 1) == 0);
// and check that our pop worked
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_drop_compact]
# this should large enough so only one entry can fit in a block
defines.SIZE = 'BLOCK_SIZE / 4'
defines.SIBLING = [0, 1]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// force it to split
// the extra push here avoids trying to inline the big entry
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("_", 1)))) => 0;
uint8_t buf1[SIZE];
memset(buf1, 'a', SIZE);
uint8_t buf2[SIZE];
memset(buf2, 'b', SIZE);
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF(buf1, SIZE)),
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF(buf2, SIZE)))) => 0;
// force compaction
btree.eoff = -1;
memset(buf2, 'b', SIZE);
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(buf2, SIZE)))) => 0;
assert(btree.weight == 2);
// now remove one entry, since this brings the rbyd down this zero,
// this should force one of the blocks to drop
//
// do this while forcing a compaction
btree.eoff = -1;
lfsr_btree_commit(&lfs, &btree, SIBLING, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// check that our other entry is fine
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buf1, SIZE) => SIZE;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buf1, ((SIBLING) ? "a" : "b"), 1) == 0);
// and check that our pop worked
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_drop_split]
# this should large enough so only one entry can fit in a block
defines.SIZE = 'BLOCK_SIZE / 4'
defines.SIBLING = [0, 1]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// force it to split
// the extra push here avoids trying to inline the big entry
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("_", 1)))) => 0;
uint8_t buf1[SIZE];
memset(buf1, 'a', SIZE);
uint8_t buf2[SIZE];
memset(buf2, 'b', SIZE);
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF(buf1, SIZE)),
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF(buf2, SIZE)))) => 0;
// force compaction, causing a split, but while we're splitting,
// also remove an entry, bringing the split rbyd down to zero mid split
//
// messy, isn't it? this is why we need an explicit test
//
btree.eoff = -1;
lfsr_btree_commit(&lfs, &btree, SIBLING, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// check that our other entry is fine
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buf1, SIZE) => SIZE;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buf1, ((SIBLING) ? "a" : "b"), 1) == 0);
// and check that our pop worked
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_drop_merge]
# this should large enough so only one entry can fit in a block
defines.SIZE = 'BLOCK_SIZE / 4'
defines.SIBLING = [0, 1]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// force it to split
// the extra push here avoids trying to inline the big entry
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF("_", 1)))) => 0;
uint8_t buf1[SIZE];
memset(buf1, 'a', SIZE);
uint8_t buf2[SIZE];
memset(buf2, 'b', SIZE);
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF(buf1, SIZE)),
LFSR_ATTR(LFSR_TAG_DATA, +1, LFSR_DATA_BUF(buf2, SIZE)))) => 0;
// force compaction
btree.eoff = -1;
memset(buf2, 'b', SIZE);
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(buf2, SIZE)))) => 0;
assert(btree.weight == 2);
// now make both entries small so they should be merged if either compacts
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("a", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF("b", 1)))) => 0;
// force compaction, while removing one entry, this drops the rbyd
// down to zero while also triggering a merge
btree.eoff = -1;
lfsr_btree_commit(&lfs, &btree, SIBLING, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL()))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// check that our other entry is fine
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_lookup(&lfs, &btree, 0,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buf1, SIZE) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buf1, ((SIBLING) ? "a" : "b"), 1) == 0);
// and check that our pop worked
lfsr_btree_lookup(&lfs, &btree, 1,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
# Some more general fuzz testing
[cases.test_btree_general_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.SEED = 'range(100)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t sim_size = 0;
memset(sim, 0, N);
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random op
uint8_t op = TEST_PRNG(&prng) % 3;
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % (sim_size+1);
if (op == 0 || bid == sim_size) {
// push to btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// push to sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
sim[bid] = 'a'+(i % 26);
sim_size += 1;
} else if (op == 1) {
// update btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// update sim
sim[bid] = 'a'+(i % 26);
} else {
// pop from btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// pop from sim
memmove(&sim[bid], &sim[bid+1], sim_size-(bid+1));
sim_size -= 1;
}
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%c", sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, sim_size,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
[cases.test_btree_general_sparse_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.W = 5
defines.SEED = 'range(100)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t *sim_weights = malloc(N*sizeof(lfs_size_t));
lfs_size_t sim_size = 0;
memset(sim, 0, N);
memset(sim_weights, 0, N*sizeof(lfs_size_t));
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random op
uint8_t op = TEST_PRNG(&prng) % 3;
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % (sim_size+1);
// choose a pseudo-random weight
lfs_size_t weight = 1 + (TEST_PRNG(&prng) % W);
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < bid; j++) {
weighted_bid += sim_weights[j];
}
if (op == 0 || bid == sim_size) {
// push to btree
int err = lfsr_btree_commit(&lfs, &btree, weighted_bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +weight,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// push to sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
memmove(&sim_weights[bid+1], &sim_weights[bid],
(sim_size-bid)*sizeof(lfs_size_t));
sim[bid] = 'a'+(i % 26);
sim_weights[bid] = weight;
sim_size += 1;
} else if (op == 1) {
// update btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1)),
LFSR_ATTR(
LFSR_TAG_GROW, +weight-sim_weights[bid],
LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// update sim
sim[bid] = 'a'+(i % 26);
sim_weights[bid] = weight;
} else {
// remove from btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_RM, -sim_weights[bid],
LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// remove from sim
memmove(&sim[bid], &sim[bid+1], sim_size-(bid+1));
memmove(&sim_weights[bid], &sim_weights[bid+1],
(sim_size-(bid+1))*sizeof(lfs_size_t));
sim_size -= 1;
}
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
if (!first) {
printf(", ");
}
first = false;
printf("%dw%d=%c", weighted_bid+sim_weights[i]-1,
sim_weights[i], sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookup(&lfs, &btree, weighted_bid+sim_weights[i]-1,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, total_weight,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// also test that we can traverse the tree without prior knowledge
lfs_size_t bid_ = -1;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => 0;
assert(bid_ == weighted_bid+sim_weights[i]-1);
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == sim_weights[i]);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
lfsr_btree_lookupnext(&lfs, &btree, bid_+1,
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
'''
# test key-value btrees
[cases.test_btree_find_zero]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a zero-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 0);
// try to find tags
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aaa", 3),
&bid_, &tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_find_one]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a single-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aaa", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("0", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 1);
// try to find tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aaa", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 0);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "0", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aab", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_LT;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 0);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "0", 1) == 0);
'''
[cases.test_btree_find_two]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aaa", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("0", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("0", 1)),
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aab", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("1", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 2);
// try to find tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aaa", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 0);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "0", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aab", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 1);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "1", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aac", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_LT;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 1);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "1", 1) == 0);
'''
[cases.test_btree_find_three]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aaa", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("0", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("0", 1)),
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aab", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("1", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 1, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("1", 1)),
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aac", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("2", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 3);
// try to find tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aaa", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 0);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "0", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aab", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 1);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "1", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aac", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 2);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "2", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aad", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_LT;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 2);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "2", 1) == 0);
'''
[cases.test_btree_find_three_backwards]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a two-entry tree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aaa", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("0", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("1", 1)),
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aac", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("2", 1)))) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("0", 1)),
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("aab", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("1", 1)))) => 0;
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == 3);
// try to find tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aaa", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 0);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "0", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aab", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 1);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "1", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aac", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 2);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "2", 1) == 0);
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF("aad", 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_LT;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == 2);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, "2", 1) == 0);
'''
[cases.test_btree_find]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
char name[3] = {
'a'+((0/26/26) % 26), 'a'+((0/26) % 26), 'a'+(0 % 26)
};
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(0 % 10)}, 1)))) => 0;
lfs_size_t n = 1;
for (lfs_size_t i = 1; i < N; i++) {
char name[3] = {
'a'+((i/26/26) % 26), 'a'+((i/26) % 26), 'a'+(i % 26)
};
int err = lfsr_btree_commit(&lfs, &btree, i-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+((i-1) % 10)}, 1)),
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+((i-0) % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n);
// try to find tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
char name[3] = {
'a'+((i/26/26) % 26), 'a'+((i/26) % 26), 'a'+(i % 26)
};
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF(name, 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == i);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &(uint8_t){'0'+(i % 10)}, 1) == 0);
}
'''
[cases.test_btree_find_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("___", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("_", 1)))) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
char (*sim_names)[3] = malloc(N*3);
lfs_size_t sim_size = 1;
memset(sim, 0, N);
memset(sim_names, 0, N*3);
sim[0] = '_';
memcpy(&sim_names[0], "___", 3);
uint32_t prng = SEED;
for (lfs_size_t i = 1; i < N; i++) {
// choose a pseudo-random name
lfs_size_t x = TEST_PRNG(&prng) % (26*26*26);
char name[3] = {
'a'+((x/26/26) % 26), 'a'+((x/26) % 26), 'a'+(x % 26)
};
// find where to split
lfs_size_t bid = 0;
while (bid+1 < sim_size && memcmp(sim_names[bid+1], name, 3) <= 0) {
bid += 1;
}
// just skip exact matches for now
if (memcmp(sim_names[bid], name, 3) == 0) {
continue;
}
// split btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1)),
LFSR_ATTR(
LFSR_TAG_NAME, +1,
LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// split sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
memmove(&sim_names[bid+1], &sim_names[bid], (sim_size-bid)*3);
sim[bid+0] = '0'+(i % 10);
sim[bid+1] = '0'+(i % 10);
memcpy(&sim_names[bid+1], name, 3);
sim_size += 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%.3s=%c", sim_names[i], sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF(sim_names[i], 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == i);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// clean up sim
free(sim);
free(sim_names);
lfs_deinit(&lfs) => 0;
'''
[cases.test_btree_find_sparse]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.W = 5
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
char name[3] = {
'a'+((0/26/26) % 26), 'a'+((0/26) % 26), 'a'+(0 % 26)
};
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +W, LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(0 % 10)}, 1)))) => 0;
lfs_size_t n = 1;
for (lfs_size_t i = 1; i < N; i++) {
char name[3] = {
'a'+((i/26/26) % 26), 'a'+((i/26) % 26), 'a'+(i % 26)
};
int err = lfsr_btree_commit(&lfs, &btree, (i-1)*W+W-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+((i-1) % 10)}, 1)),
LFSR_ATTR(LFSR_TAG_NAME, +W, LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+((i-0) % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n*W);
// try to find tags
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
char name[3] = {
'a'+((i/26/26) % 26), 'a'+((i/26) % 26), 'a'+(i % 26)
};
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF(name, 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == i*W+W-1);
assert(weight_ == W);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &(uint8_t){'0'+(i % 10)}, 1) == 0);
}
'''
[cases.test_btree_find_sparse_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.W = 5
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +W, LFSR_DATA_BUF("___", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("_", 1)))) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
char (*sim_names)[3] = malloc(N*3);
lfs_size_t *sim_weights = malloc(N*sizeof(lfs_size_t));
lfs_size_t sim_size = 1;
memset(sim, 0, N);
memset(sim_names, 0, N*3);
memset(sim_weights, 0, N*sizeof(lfs_size_t));
sim[0] = '_';
memcpy(&sim_names[0], "___", 3);
sim_weights[0] = W;
uint32_t prng = SEED;
for (lfs_size_t i = 1; i < N; i++) {
// choose a pseudo-random name
lfs_size_t x = TEST_PRNG(&prng) % (26*26*26);
char name[3] = {
'a'+((x/26/26) % 26), 'a'+((x/26) % 26), 'a'+(x % 26)
};
// choose pseudo-random weights
lfs_size_t weight1 = 1 + (TEST_PRNG(&prng) % W);
lfs_size_t weight2 = 1 + (TEST_PRNG(&prng) % W);
// find where to split
lfs_size_t bid = 0;
while (bid+1 < sim_size && memcmp(sim_names[bid+1], name, 3) <= 0) {
bid += 1;
}
// just skip exact matches for now
if (memcmp(sim_names[bid], name, 3) == 0) {
continue;
}
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < bid; j++) {
weighted_bid += sim_weights[j];
}
// split btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_GROW, +weight1-sim_weights[bid],
LFSR_DATA_NULL()),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1)),
LFSR_ATTR(
LFSR_TAG_NAME, +weight2,
LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// split sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
memmove(&sim_names[bid+1], &sim_names[bid], (sim_size-bid)*3);
memmove(&sim_weights[bid+1], &sim_weights[bid],
(sim_size-bid)*sizeof(lfs_size_t));
sim[bid+0] = '0'+(i % 10);
sim[bid+1] = '0'+(i % 10);
memcpy(&sim_names[bid+1], name, 3);
sim_weights[bid+0] = weight1;
sim_weights[bid+1] = weight2;
sim_size += 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
if (!first) {
printf(", ");
}
first = false;
printf("%.3sid%dw%d=%c",
sim_names[i],
weighted_bid+sim_weights[i]-1,
sim_weights[i],
sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF(sim_names[i], 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == weighted_bid+sim_weights[i]-1);
assert(weight_ == sim_weights[i]);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// clean up sim
free(sim);
free(sim_names);
free(sim_weights);
lfs_deinit(&lfs) => 0;
'''
# make sure we test finds with other operations
[cases.test_btree_find_general_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.SEED = 'range(100)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF("___", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("_", 1)))) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
char (*sim_names)[3] = malloc(N*3);
lfs_size_t sim_size = 1;
memset(sim, 0, N);
memset(sim_names, 0, N*3);
sim[0] = '_';
memcpy(&sim_names[0], "___", 3);
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random op
uint8_t op = TEST_PRNG(&prng) % 3;
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % ((sim_size == 0) ? 1 : sim_size);
// choose a pseudo-random name
lfs_size_t x = TEST_PRNG(&prng) % (26*26*26);
char name[3] = {
'a'+((x/26/26) % 26), 'a'+((x/26) % 26), 'a'+(x % 26)
};
// don't let sim drop below one element
if (op == 0 || sim_size <= 1) {
// find where to split
lfs_size_t bid = 0;
while (bid < sim_size && memcmp(name, sim_names[bid], 3) > 0) {
bid += 1;
}
// just skip exact matches for now
if (memcmp(name, sim_names[bid], 3) == 0) {
continue;
}
// split btree
lfs_size_t split_bid;
lfsr_data_t split_data;
lfs_scmp_t cmp = lfsr_btree_namelookup(&lfs, &btree,
&LFSR_DATA_BUF(name, 3),
&split_bid, NULL, NULL, &split_data);
assert(cmp >= 0);
assert(cmp != LFS_CMP_EQ);
if (cmp > LFS_CMP_EQ) {
int err = lfsr_btree_commit(&lfs, &btree,
split_bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_NAME, +1,
LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
} else {
int err = lfsr_btree_commit(&lfs, &btree, split_bid, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, split_data),
LFSR_ATTR(LFSR_TAG_NAME, +1, LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
}
// split sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
memmove(&sim_names[bid+1], &sim_names[bid], (sim_size-bid)*3);
sim[bid] = '0'+(i % 10);
memcpy(&sim_names[bid], name, 3);
sim_size += 1;
} else if (op == 1) {
// update btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// update sim
sim[bid] = '0'+(i % 10);
} else {
// pop from btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_RM, -1, LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// pop from sim
memmove(&sim[bid], &sim[bid+1], sim_size-(bid+1));
memmove(&sim_names[bid], &sim_names[bid+1], (sim_size-(bid+1))*3);
sim_size -= 1;
}
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%.3s=%c", sim_names[i], sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF(sim_names[i], 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == i);
assert(weight_ == 1);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// clean up sim
free(sim);
free(sim_names);
'''
[cases.test_btree_find_general_sparse_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
defines.W = 5
defines.SEED = 'range(100)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfsr_btree_commit(&lfs, &btree, 0, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_NAME, +W,
LFSR_DATA_BUF("___", 3)),
LFSR_ATTR(LFSR_TAG_DATA, 0, LFSR_DATA_BUF("_", 1)))) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
char (*sim_names)[3] = malloc(N*3);
lfs_size_t *sim_weights = malloc(N*sizeof(lfs_size_t));
lfs_size_t sim_size = 1;
memset(sim, 0, N);
memset(sim_names, 0, N*3);
memset(sim_weights, 0, N*sizeof(lfs_size_t));
sim[0] = '_';
memcpy(&sim_names[0], "___", 3);
sim_weights[0] = W;
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random op
uint8_t op = TEST_PRNG(&prng) % 3;
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % ((sim_size == 0) ? 1 : sim_size);
// choose a pseudo-random name
lfs_size_t x = TEST_PRNG(&prng) % (26*26*26);
char name[3] = {
'a'+((x/26/26) % 26), 'a'+((x/26) % 26), 'a'+(x % 26)
};
// choose a pseudo-random weight
lfs_size_t weight = 1 + (TEST_PRNG(&prng) % W);
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < bid; j++) {
weighted_bid += sim_weights[j];
}
// don't let sim drop below one element
if (op == 0 || sim_size <= 1) {
// find where to split
lfs_size_t bid = 0;
while (bid < sim_size && memcmp(name, sim_names[bid], 3) > 0) {
bid += 1;
}
// just skip exact matches for now
if (memcmp(name, sim_names[bid], 3) == 0) {
continue;
}
// split btree
lfs_size_t split_bid;
lfs_size_t split_weight;
lfsr_data_t split_data;
lfs_scmp_t cmp = lfsr_btree_namelookup(&lfs, &btree,
&LFSR_DATA_BUF(name, 3),
&split_bid, NULL, &split_weight, &split_data);
assert(cmp >= 0);
assert(cmp != LFS_CMP_EQ);
if (cmp > LFS_CMP_EQ) {
int err = lfsr_btree_commit(&lfs, &btree,
split_bid-(split_weight-1), LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_NAME, +weight,
LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
} else {
int err = lfsr_btree_commit(&lfs, &btree, split_bid, LFSR_ATTRS(
LFSR_ATTR(LFSR_TAG_DATA, 0, split_data),
LFSR_ATTR(
LFSR_TAG_NAME, +weight,
LFSR_DATA_BUF(name, 3)),
LFSR_ATTR(
LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
}
// split sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
memmove(&sim_names[bid+1], &sim_names[bid], (sim_size-bid)*3);
memmove(&sim_weights[bid+1], &sim_weights[bid],
(sim_size-bid)*sizeof(lfs_size_t));
sim[bid] = '0'+(i % 10);
memcpy(&sim_names[bid], name, 3);
sim_weights[bid] = weight;
sim_size += 1;
} else if (op == 1) {
// update btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_SUBMASK | LFSR_TAG_DATA, 0,
LFSR_DATA_BUF(&(uint8_t){'0'+(i % 10)}, 1)),
LFSR_ATTR(
LFSR_TAG_GROW, +weight-sim_weights[bid],
LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// update sim
sim[bid] = '0'+(i % 10);
sim_weights[bid] = weight;
} else {
// pop from btree
int err = lfsr_btree_commit(&lfs, &btree,
weighted_bid+sim_weights[bid]-1, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_RM, -sim_weights[bid],
LFSR_DATA_NULL())));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// pop from sim
memmove(&sim[bid], &sim[bid+1], sim_size-(bid+1));
memmove(&sim_names[bid], &sim_names[bid+1], (sim_size-(bid+1))*3);
memmove(&sim_weights[bid], &sim_weights[bid+1],
(sim_size-(bid+1))*sizeof(lfs_size_t));
sim_size -= 1;
}
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
if (!first) {
printf(", ");
}
first = false;
printf("%.3sid%dw%d=%c",
sim_names[i],
weighted_bid+sim_weights[i]-1,
sim_weights[i],
sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(btree.weight == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t bid_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_namelookup(&lfs, &btree, &LFSR_DATA_BUF(sim_names[i], 3),
&bid_, &tag_, &weight_, &data_) => LFS_CMP_EQ;
assert(tag_ == LFSR_TAG_DATA);
assert(bid_ == weighted_bid+sim_weights[i]-1);
assert(weight_ == sim_weights[i]);
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// clean up sim
free(sim);
free(sim_names);
free(sim_weights);
'''
## B-tree traversal tests ##
# some simple btree traversals
[cases.test_btree_traversal]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024]
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a tree with N elements
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
lfs_size_t n = 0;
for (lfs_size_t i = 0; i < N; i++) {
int err = lfsr_btree_commit(&lfs, &btree, i, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
n += 1;
}
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == n);
// check that the elements are in the tree
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, n,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// test that we can traverse the tree, keeping track of all blocks we see
uint8_t *seen = malloc((BLOCK_COUNT+7)/8);
memset(seen, 0, (BLOCK_COUNT+7)/8);
lfsr_btraversal_t traversal = LFSR_BTRAVERSAL();
for (lfs_block_t i = 0;; i++) {
// a bit hacky, but this catches infinite loops
assert(i <= 2*N);
lfsr_bid_t bid;
lfsr_tinfo_t tinfo;
int err = lfsr_btree_traverse(&lfs, &btree, &traversal,
&bid, &tinfo);
assert(!err || err == LFS_ERR_NOENT);
if (err == LFS_ERR_NOENT) {
break;
}
if (tinfo.tag == LFSR_TAG_BRANCH) {
printf("traversal: %d 0x%x btree 0x%x.%x\n",
bid,
tinfo.tag,
tinfo.u.rbyd.blocks[0], tinfo.u.rbyd.trunk);
// keep track of seen blocks
seen[tinfo.u.rbyd.blocks[0] / 8]
|= 1 << (tinfo.u.rbyd.blocks[0] % 8);
} else if (tinfo.tag == LFSR_TAG_DATA) {
printf("traversal: %d 0x%x data %d\n",
bid,
tinfo.tag,
lfsr_data_size(&tinfo.u.data));
} else {
// well this shouldn't happen
printf("traversal: %d 0x%x\n",
bid,
tinfo.tag);
assert(false);
}
}
// if traversal worked, we should be able to clobber all other blocks
uint8_t clobber_buf[BLOCK_SIZE];
memset(clobber_buf, 0xcc, BLOCK_SIZE);
for (lfs_block_t block = 0; block < BLOCK_COUNT; block++) {
if (!(seen[block / 8] & (1 << (block % 8)))) {
CFG->erase(CFG, block) => 0;
CFG->prog(CFG, block, 0, clobber_buf, BLOCK_SIZE) => 0;
}
}
free(seen);
// and the tree should still work
// check that the elements are in the tree
for (lfs_size_t i = 0; i < n; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &(uint8_t){'a'+(i % 26)}, 1) == 0);
}
// and check that we can't lookup elements that aren't in the tree
lfsr_btree_lookup(&lfs, &btree, n,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
'''
[cases.test_btree_traversal_fuzz]
defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
defines.SEED = 'range(10)'
in = 'lfs.c'
code = '''
lfs_t lfs;
lfs_init(&lfs, CFG) => 0;
// create free lookahead
memset(lfs.lookahead.buffer, 0, CFG->lookahead_size);
lfs.lookahead.start = 0;
lfs.lookahead.size = lfs_min(8*CFG->lookahead_size,
CFG->block_count);
lfs.lookahead.next = 0;
lfs_alloc_ckpoint(&lfs);
// create a btree
lfsr_btree_t btree;
lfsr_btree_alloc(&lfs, &btree) => 0;
// set up a simulation to compare against
//
// fun fact this is slower than our actual tree! unfun fact this is
// starting to be a problem...
char *sim = malloc(N);
lfs_size_t sim_size = 0;
memset(sim, 0, N);
uint32_t prng = SEED;
for (lfs_size_t i = 0; i < N; i++) {
// choose a pseudo-random bid
lfs_size_t bid = TEST_PRNG(&prng) % (sim_size+1);
// add to btree
int err = lfsr_btree_commit(&lfs, &btree, bid, LFSR_ATTRS(
LFSR_ATTR(
LFSR_TAG_DATA, +1,
LFSR_DATA_BUF(&(uint8_t){'a'+(i % 26)}, 1))));
// ignore space issues
if (err == LFS_ERR_NOSPC) {
break;
}
assert(err == 0);
// add to sim
memmove(&sim[bid+1], &sim[bid], sim_size-bid);
sim[bid] = 'a'+(i % 26);
sim_size += 1;
}
// check that btree matches sim
printf("expd: [");
bool first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%c", sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
lfsr_data_t data_;
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, sim_size,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// test that we can traverse the tree, keeping track of all blocks
// we see
uint8_t *seen = malloc((BLOCK_COUNT+7)/8);
memset(seen, 0, (BLOCK_COUNT+7)/8);
lfsr_btraversal_t traversal = LFSR_BTRAVERSAL();
for (lfs_block_t i = 0;; i++) {
// a bit hacky, but this catches infinite loops
assert(i <= 2*N);
lfsr_bid_t bid;
lfsr_tinfo_t tinfo;
int err = lfsr_btree_traverse(&lfs, &btree, &traversal,
&bid, &tinfo);
assert(!err || err == LFS_ERR_NOENT);
if (err == LFS_ERR_NOENT) {
break;
}
if (tinfo.tag == LFSR_TAG_BRANCH) {
printf("traversal: %d 0x%x btree 0x%x.%x\n",
bid,
tinfo.tag,
tinfo.u.rbyd.blocks[0], tinfo.u.rbyd.trunk);
// keep track of seen blocks
seen[tinfo.u.rbyd.blocks[0] / 8]
|= 1 << (tinfo.u.rbyd.blocks[0] % 8);
} else if (tinfo.tag == LFSR_TAG_DATA) {
printf("traversal: %d 0x%x data %d\n",
bid,
tinfo.tag,
lfsr_data_size(&tinfo.u.data));
} else {
// well this shouldn't happen
printf("traversal: %d 0x%x\n",
bid,
tinfo.tag);
assert(false);
}
}
// if traversal worked, we should be able to clobber all other blocks
uint8_t clobber_buf[BLOCK_SIZE];
memset(clobber_buf, 0xcc, BLOCK_SIZE);
for (lfs_block_t block = 0; block < BLOCK_COUNT; block++) {
if (!(seen[block / 8] & (1 << (block % 8)))) {
CFG->erase(CFG, block) => 0;
CFG->prog(CFG, block, 0, clobber_buf, BLOCK_SIZE) => 0;
}
}
free(seen);
// and the tree should still work
// check that btree matches sim
printf("expd: [");
first = true;
for (lfs_size_t i = 0; i < sim_size; i++) {
if (!first) {
printf(", ");
}
first = false;
printf("%c", sim[i]);
}
printf("]\n");
printf("btree: w%d 0x%x.%x\n",
btree.weight,
btree.blocks[0],
btree.trunk);
assert(btree.weight == sim_size);
for (lfs_size_t i = 0; i < sim_size; i++) {
lfsr_btree_lookup(&lfs, &btree, i,
&tag_, &weight_, &data_) => 0;
lfsr_data_read(&lfs, &data_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_DATA);
assert(weight_ == 1);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
// and no extra elements
lfsr_btree_lookup(&lfs, &btree, sim_size,
&tag_, &weight_, &data_) => LFS_ERR_NOENT;
// clean up sim
free(sim);
lfs_deinit(&lfs) => 0;
'''
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