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Added lfsr_obshrub_t for generalized tracked bshrubs

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So now files and traversals contain several nested structs:

  file     <-- lfsr_file_t
  file.o   <-- lfsr_obshrub_t
  file.o.o <-- lfsr_omdir_t

This gets a bit ugly, but it's really the only way to make the compiler
happy when also with C's annoying strict aliasing rules.

This also makes lfsr_traversal_t a simple alias of lfsr_mtraversal_t,
with lfsr_mtraversal_t now including all of the obshrub/omdir state.
This simplifies things internally, and allows lfsr_mtree_gc to assert on
opened-list enrollment, but risks increased stack cost for all of the
unused fields.

Fortunately this stack cost turned out to not be that significant:

           code          stack
  before: 35264           2680 (+0.0%)
  after:  35256 (-0.0%)   2688 (+0.3%)
This commit is contained in:
Christopher Haster
2024-07-03 15:57:59 -05:00
parent 8d7e71d961
commit c316270ebb
5 changed files with 487 additions and 484 deletions
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tests/test_alloc.toml
+3 -6
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@@ -163,7 +163,6 @@ code = '''
uint8_t *seen = malloc((BLOCK_COUNT+7)/8);
memset(seen, 0, (BLOCK_COUNT+7)/8);
lfsr_mdir_t mdir;
lfsr_mtraversal_t mt = LFSR_MTRAVERSAL(
(CKMETA) ? LFS_T_CKMETA : 0);
for (lfs_block_t i = 0;; i++) {
@@ -171,7 +170,7 @@ code = '''
assert(i < 2*BLOCK_COUNT);
lfsr_mtinfo_t mtinfo;
int err = lfsr_mtree_traverse(&lfs, &mdir, &mt, &mtinfo);
int err = lfsr_mtree_traverse(&lfs, &mt, &mtinfo);
assert(!err || err == LFS_ERR_NOENT);
if (err == LFS_ERR_NOENT) {
break;
@@ -332,7 +331,6 @@ code = '''
uint8_t *seen = malloc((BLOCK_COUNT+7)/8);
memset(seen, 0, (BLOCK_COUNT+7)/8);
lfsr_mdir_t mdir;
lfsr_mtraversal_t mt = LFSR_MTRAVERSAL(
((CKMETA) ? LFS_T_CKMETA : 0));
for (lfs_block_t i = 0;; i++) {
@@ -340,7 +338,7 @@ code = '''
assert(i < 2*BLOCK_COUNT);
lfsr_mtinfo_t mtinfo;
int err = lfsr_mtree_traverse(&lfs, &mdir, &mt, &mtinfo);
int err = lfsr_mtree_traverse(&lfs, &mt, &mtinfo);
assert(!err || err == LFS_ERR_NOENT);
if (err == LFS_ERR_NOENT) {
break;
@@ -487,7 +485,6 @@ code = '''
uint8_t *seen = malloc((BLOCK_COUNT+7)/8);
memset(seen, 0, (BLOCK_COUNT+7)/8);
lfsr_mdir_t mdir;
lfsr_mtraversal_t mt = LFSR_MTRAVERSAL(
((CKMETA) ? LFS_T_CKMETA : 0));
for (lfs_block_t i = 0;; i++) {
@@ -495,7 +492,7 @@ code = '''
assert(i < 2*BLOCK_COUNT);
lfsr_mtinfo_t mtinfo;
int err = lfsr_mtree_traverse(&lfs, &mdir, &mt, &mtinfo);
int err = lfsr_mtree_traverse(&lfs, &mt, &mtinfo);
assert(!err || err == LFS_ERR_NOENT);
if (err == LFS_ERR_NOENT) {
break;