From: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>
This reduces the amount of glue code, because we don't need a void pointer or
vtable within the structure.
The only snag is that reftable_index_record contain a strbuf, so it cannot be
zero-initialized. To address this, use reftable_new_record() to return fresh
instance, given a record type. Since reftable_new_record() doesn't cause heap
allocation anymore, it should be balanced with reftable_record_release() rather
than reftable_record_destroy().
Thanks to Peff for the suggestion.
Helped-by: Jeff King <peff@xxxxxxxx>
Signed-off-by: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>
---
reftable/block.c | 2 +-
reftable/block_test.c | 22 ++---
reftable/generic.c | 35 ++++----
reftable/iter.c | 4 +-
reftable/merged.c | 33 ++++----
reftable/pq.c | 3 +-
reftable/pq_test.c | 31 +++----
reftable/reader.c | 93 +++++++++++----------
reftable/record.c | 173 ++++++++++++++++-----------------------
reftable/record.h | 42 ++++------
reftable/record_test.c | 181 +++++++++++++++++++++--------------------
reftable/writer.c | 40 +++++----
12 files changed, 317 insertions(+), 342 deletions(-)
diff --git a/reftable/block.c b/reftable/block.c
index 37a85b9576d..872bedaa2f0 100644
--- a/reftable/block.c
+++ b/reftable/block.c
@@ -423,7 +423,7 @@ int block_reader_seek(struct block_reader *br, struct block_iter *it,
done:
strbuf_release(&key);
strbuf_release(&next.last_key);
- reftable_record_destroy(&rec);
+ reftable_record_release(&rec);
return err;
}
diff --git a/reftable/block_test.c b/reftable/block_test.c
index 4b3ea262dcb..fa2ee092ec0 100644
--- a/reftable/block_test.c
+++ b/reftable/block_test.c
@@ -26,8 +26,9 @@ static void test_block_read_write(void)
struct block_writer bw = {
.last_key = STRBUF_INIT,
};
- struct reftable_ref_record ref = { NULL };
- struct reftable_record rec = { NULL };
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_REF,
+ };
int i = 0;
int n;
struct block_reader br = { 0 };
@@ -40,7 +41,6 @@ static void test_block_read_write(void)
block.source = malloc_block_source();
block_writer_init(&bw, BLOCK_TYPE_REF, block.data, block_size,
header_off, hash_size(GIT_SHA1_FORMAT_ID));
- reftable_record_from_ref(&rec, &ref);
for (i = 0; i < N; i++) {
char name[100];
@@ -48,14 +48,14 @@ static void test_block_read_write(void)
snprintf(name, sizeof(name), "branch%02d", i);
memset(hash, i, sizeof(hash));
- ref.refname = name;
- ref.value_type = REFTABLE_REF_VAL1;
- ref.value.val1 = hash;
+ rec.u.ref.refname = name;
+ rec.u.ref.value_type = REFTABLE_REF_VAL1;
+ rec.u.ref.value.val1 = hash;
names[i] = xstrdup(name);
n = block_writer_add(&bw, &rec);
- ref.refname = NULL;
- ref.value_type = REFTABLE_REF_DELETION;
+ rec.u.ref.refname = NULL;
+ rec.u.ref.value_type = REFTABLE_REF_DELETION;
EXPECT(n == 0);
}
@@ -74,7 +74,7 @@ static void test_block_read_write(void)
if (r > 0) {
break;
}
- EXPECT_STREQ(names[j], ref.refname);
+ EXPECT_STREQ(names[j], rec.u.ref.refname);
j++;
}
@@ -92,7 +92,7 @@ static void test_block_read_write(void)
n = block_iter_next(&it, &rec);
EXPECT(n == 0);
- EXPECT_STREQ(names[i], ref.refname);
+ EXPECT_STREQ(names[i], rec.u.ref.refname);
want.len--;
n = block_reader_seek(&br, &it, &want);
@@ -100,7 +100,7 @@ static void test_block_read_write(void)
n = block_iter_next(&it, &rec);
EXPECT(n == 0);
- EXPECT_STREQ(names[10 * (i / 10)], ref.refname);
+ EXPECT_STREQ(names[10 * (i / 10)], rec.u.ref.refname);
block_iter_close(&it);
}
diff --git a/reftable/generic.c b/reftable/generic.c
index 7a8a738d860..4446b8ed360 100644
--- a/reftable/generic.c
+++ b/reftable/generic.c
@@ -7,6 +7,7 @@ https://developers.google.com/open-source/licenses/bsd
*/
#include "basics.h"
+#include "constants.h"
#include "record.h"
#include "generic.h"
#include "reftable-iterator.h"
@@ -15,23 +16,21 @@ https://developers.google.com/open-source/licenses/bsd
int reftable_table_seek_ref(struct reftable_table *tab,
struct reftable_iterator *it, const char *name)
{
- struct reftable_ref_record ref = {
- .refname = (char *)name,
- };
- struct reftable_record rec = { NULL };
- reftable_record_from_ref(&rec, &ref);
+ struct reftable_record rec = { .type = BLOCK_TYPE_REF,
+ .u.ref = {
+ .refname = (char *)name,
+ } };
return tab->ops->seek_record(tab->table_arg, it, &rec);
}
int reftable_table_seek_log(struct reftable_table *tab,
struct reftable_iterator *it, const char *name)
{
- struct reftable_log_record log = {
- .refname = (char *)name,
- .update_index = ~((uint64_t)0),
- };
- struct reftable_record rec = { NULL };
- reftable_record_from_log(&rec, &log);
+ struct reftable_record rec = { .type = BLOCK_TYPE_LOG,
+ .u.log = {
+ .refname = (char *)name,
+ .update_index = ~((uint64_t)0),
+ } };
return tab->ops->seek_record(tab->table_arg, it, &rec);
}
@@ -129,17 +128,19 @@ void reftable_iterator_destroy(struct reftable_iterator *it)
int reftable_iterator_next_ref(struct reftable_iterator *it,
struct reftable_ref_record *ref)
{
- struct reftable_record rec = { NULL };
- reftable_record_from_ref(&rec, ref);
- return iterator_next(it, &rec);
+ struct reftable_record rec = { .type = BLOCK_TYPE_REF };
+ int err = iterator_next(it, &rec);
+ *ref = rec.u.ref;
+ return err;
}
int reftable_iterator_next_log(struct reftable_iterator *it,
struct reftable_log_record *log)
{
- struct reftable_record rec = { NULL };
- reftable_record_from_log(&rec, log);
- return iterator_next(it, &rec);
+ struct reftable_record rec = { .type = BLOCK_TYPE_LOG };
+ int err = iterator_next(it, &rec);
+ *log = rec.u.log;
+ return err;
}
int iterator_next(struct reftable_iterator *it, struct reftable_record *rec)
diff --git a/reftable/iter.c b/reftable/iter.c
index 93d04f735b8..a8d174c0406 100644
--- a/reftable/iter.c
+++ b/reftable/iter.c
@@ -32,7 +32,7 @@ static int filtering_ref_iterator_next(void *iter_arg,
struct reftable_record *rec)
{
struct filtering_ref_iterator *fri = iter_arg;
- struct reftable_ref_record *ref = rec->data;
+ struct reftable_ref_record *ref = &rec->u.ref;
int err = 0;
while (1) {
err = reftable_iterator_next_ref(&fri->it, ref);
@@ -127,7 +127,7 @@ static int indexed_table_ref_iter_next_block(struct indexed_table_ref_iter *it)
static int indexed_table_ref_iter_next(void *p, struct reftable_record *rec)
{
struct indexed_table_ref_iter *it = p;
- struct reftable_ref_record *ref = rec->data;
+ struct reftable_ref_record *ref = &rec->u.ref;
while (1) {
int err = block_iter_next(&it->cur, rec);
diff --git a/reftable/merged.c b/reftable/merged.c
index e5b53da6db3..a7c0df91ff0 100644
--- a/reftable/merged.c
+++ b/reftable/merged.c
@@ -30,7 +30,7 @@ static int merged_iter_init(struct merged_iter *mi)
if (err > 0) {
reftable_iterator_destroy(&mi->stack[i]);
- reftable_record_destroy(&rec);
+ reftable_record_release(&rec);
} else {
struct pq_entry e = {
.rec = rec,
@@ -57,18 +57,17 @@ static void merged_iter_close(void *p)
static int merged_iter_advance_nonnull_subiter(struct merged_iter *mi,
size_t idx)
{
- struct reftable_record rec = reftable_new_record(mi->typ);
struct pq_entry e = {
- .rec = rec,
+ .rec = reftable_new_record(mi->typ),
.index = idx,
};
- int err = iterator_next(&mi->stack[idx], &rec);
+ int err = iterator_next(&mi->stack[idx], &e.rec);
if (err < 0)
return err;
if (err > 0) {
reftable_iterator_destroy(&mi->stack[idx]);
- reftable_record_destroy(&rec);
+ reftable_record_release(&e.rec);
return 0;
}
@@ -126,11 +125,11 @@ static int merged_iter_next_entry(struct merged_iter *mi,
if (err < 0) {
return err;
}
- reftable_record_destroy(&top.rec);
+ reftable_record_release(&top.rec);
}
reftable_record_copy_from(rec, &entry.rec, hash_size(mi->hash_id));
- reftable_record_destroy(&entry.rec);
+ reftable_record_release(&entry.rec);
strbuf_release(&entry_key);
return 0;
}
@@ -290,11 +289,12 @@ int reftable_merged_table_seek_ref(struct reftable_merged_table *mt,
struct reftable_iterator *it,
const char *name)
{
- struct reftable_ref_record ref = {
- .refname = (char *)name,
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_REF,
+ .u.ref = {
+ .refname = (char *)name,
+ },
};
- struct reftable_record rec = { NULL };
- reftable_record_from_ref(&rec, &ref);
return merged_table_seek_record(mt, it, &rec);
}
@@ -302,12 +302,13 @@ int reftable_merged_table_seek_log_at(struct reftable_merged_table *mt,
struct reftable_iterator *it,
const char *name, uint64_t update_index)
{
- struct reftable_log_record log = {
- .refname = (char *)name,
- .update_index = update_index,
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_LOG,
+ .u.log = {
+ .refname = (char *)name,
+ .update_index = update_index,
+ }
};
- struct reftable_record rec = { NULL };
- reftable_record_from_log(&rec, &log);
return merged_table_seek_record(mt, it, &rec);
}
diff --git a/reftable/pq.c b/reftable/pq.c
index efc474017a2..96ca6dd37b3 100644
--- a/reftable/pq.c
+++ b/reftable/pq.c
@@ -74,6 +74,7 @@ struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq)
void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, struct pq_entry e)
{
int i = 0;
+
if (pq->len == pq->cap) {
pq->cap = 2 * pq->cap + 1;
pq->heap = reftable_realloc(pq->heap,
@@ -98,7 +99,7 @@ void merged_iter_pqueue_release(struct merged_iter_pqueue *pq)
{
int i = 0;
for (i = 0; i < pq->len; i++) {
- reftable_record_destroy(&pq->heap[i].rec);
+ reftable_record_release(&pq->heap[i].rec);
}
FREE_AND_NULL(pq->heap);
pq->len = pq->cap = 0;
diff --git a/reftable/pq_test.c b/reftable/pq_test.c
index c9bb05e37b7..e0f5c584ada 100644
--- a/reftable/pq_test.c
+++ b/reftable/pq_test.c
@@ -31,7 +31,7 @@ static void test_pq(void)
int N = ARRAY_SIZE(names) - 1;
struct merged_iter_pqueue pq = { NULL };
- const char *last = NULL;
+ char *last = NULL;
int i = 0;
for (i = 0; i < N; i++) {
@@ -42,12 +42,14 @@ static void test_pq(void)
i = 1;
do {
- struct reftable_record rec =
- reftable_new_record(BLOCK_TYPE_REF);
- struct pq_entry e = { 0 };
-
- reftable_record_as_ref(&rec)->refname = names[i];
- e.rec = rec;
+ struct pq_entry e = {
+ .rec = {
+ .type = BLOCK_TYPE_REF,
+ .u.ref = {
+ .refname = names[i],
+ }
+ }
+ };
merged_iter_pqueue_add(&pq, e);
merged_iter_pqueue_check(pq);
i = (i * 7) % N;
@@ -55,19 +57,18 @@ static void test_pq(void)
while (!merged_iter_pqueue_is_empty(pq)) {
struct pq_entry e = merged_iter_pqueue_remove(&pq);
- struct reftable_ref_record *ref =
- reftable_record_as_ref(&e.rec);
-
+ struct reftable_record *rec = &e.rec;
merged_iter_pqueue_check(pq);
+ EXPECT(reftable_record_type(rec) == BLOCK_TYPE_REF);
if (last) {
- EXPECT(strcmp(last, ref->refname) < 0);
+ EXPECT(strcmp(last, rec->u.ref.refname) < 0);
}
- last = ref->refname;
- ref->refname = NULL;
- reftable_free(ref);
+ // this is names[i], so don't dealloc.
+ last = rec->u.ref.refname;
+ rec->u.ref.refname = NULL;
+ reftable_record_release(rec);
}
-
for (i = 0; i < N; i++) {
reftable_free(names[i]);
}
diff --git a/reftable/reader.c b/reftable/reader.c
index 8d308d858f8..4a25c1d44f4 100644
--- a/reftable/reader.c
+++ b/reftable/reader.c
@@ -239,8 +239,7 @@ static int table_iter_next_in_block(struct table_iter *ti,
{
int res = block_iter_next(&ti->bi, rec);
if (res == 0 && reftable_record_type(rec) == BLOCK_TYPE_REF) {
- ((struct reftable_ref_record *)rec->data)->update_index +=
- ti->r->min_update_index;
+ rec->u.ref.update_index += ti->r->min_update_index;
}
return res;
@@ -437,8 +436,7 @@ static int reader_start(struct reftable_reader *r, struct table_iter *ti,
static int reader_seek_linear(struct reftable_reader *r, struct table_iter *ti,
struct reftable_record *want)
{
- struct reftable_record rec =
- reftable_new_record(reftable_record_type(want));
+ struct reftable_record rec = reftable_new_record(reftable_record_type(want));
struct strbuf want_key = STRBUF_INIT;
struct strbuf got_key = STRBUF_INIT;
struct table_iter next = TABLE_ITER_INIT;
@@ -475,7 +473,7 @@ static int reader_seek_linear(struct reftable_reader *r, struct table_iter *ti,
done:
block_iter_close(&next.bi);
- reftable_record_destroy(&rec);
+ reftable_record_release(&rec);
strbuf_release(&want_key);
strbuf_release(&got_key);
return err;
@@ -485,34 +483,36 @@ static int reader_seek_indexed(struct reftable_reader *r,
struct reftable_iterator *it,
struct reftable_record *rec)
{
- struct reftable_index_record want_index = { .last_key = STRBUF_INIT };
- struct reftable_record want_index_rec = { NULL };
- struct reftable_index_record index_result = { .last_key = STRBUF_INIT };
- struct reftable_record index_result_rec = { NULL };
+ struct reftable_record want_index = {
+ .type = BLOCK_TYPE_INDEX,
+ .u.idx = { .last_key = STRBUF_INIT }
+ };
+ struct reftable_record index_result = {
+ .type = BLOCK_TYPE_INDEX,
+ .u.idx = { .last_key = STRBUF_INIT },
+ };
struct table_iter index_iter = TABLE_ITER_INIT;
struct table_iter next = TABLE_ITER_INIT;
int err = 0;
- reftable_record_key(rec, &want_index.last_key);
- reftable_record_from_index(&want_index_rec, &want_index);
- reftable_record_from_index(&index_result_rec, &index_result);
-
+ reftable_record_key(rec, &want_index.u.idx.last_key);
err = reader_start(r, &index_iter, reftable_record_type(rec), 1);
if (err < 0)
goto done;
- err = reader_seek_linear(r, &index_iter, &want_index_rec);
+ err = reader_seek_linear(r, &index_iter, &want_index);
while (1) {
- err = table_iter_next(&index_iter, &index_result_rec);
+ err = table_iter_next(&index_iter, &index_result);
table_iter_block_done(&index_iter);
if (err != 0)
goto done;
- err = reader_table_iter_at(r, &next, index_result.offset, 0);
+ err = reader_table_iter_at(r, &next, index_result.u.idx.offset,
+ 0);
if (err != 0)
goto done;
- err = block_iter_seek(&next.bi, &want_index.last_key);
+ err = block_iter_seek(&next.bi, &want_index.u.idx.last_key);
if (err < 0)
goto done;
@@ -540,8 +540,8 @@ static int reader_seek_indexed(struct reftable_reader *r,
done:
block_iter_close(&next.bi);
table_iter_close(&index_iter);
- reftable_record_release(&want_index_rec);
- reftable_record_release(&index_result_rec);
+ reftable_record_release(&want_index);
+ reftable_record_release(&index_result);
return err;
}
@@ -549,8 +549,7 @@ static int reader_seek_internal(struct reftable_reader *r,
struct reftable_iterator *it,
struct reftable_record *rec)
{
- struct reftable_reader_offsets *offs =
- reader_offsets_for(r, reftable_record_type(rec));
+ struct reftable_reader_offsets *offs = reader_offsets_for(r, reftable_record_type(rec));
uint64_t idx = offs->index_offset;
struct table_iter ti = TABLE_ITER_INIT;
int err = 0;
@@ -590,11 +589,12 @@ static int reader_seek(struct reftable_reader *r, struct reftable_iterator *it,
int reftable_reader_seek_ref(struct reftable_reader *r,
struct reftable_iterator *it, const char *name)
{
- struct reftable_ref_record ref = {
- .refname = (char *)name,
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_REF,
+ .u.ref = {
+ .refname = (char *)name,
+ },
};
- struct reftable_record rec = { NULL };
- reftable_record_from_ref(&rec, &ref);
return reader_seek(r, it, &rec);
}
@@ -602,12 +602,13 @@ int reftable_reader_seek_log_at(struct reftable_reader *r,
struct reftable_iterator *it, const char *name,
uint64_t update_index)
{
- struct reftable_log_record log = {
- .refname = (char *)name,
- .update_index = update_index,
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_LOG,
+ .u.log = {
+ .refname = (char *)name,
+ .update_index = update_index,
+ }
};
- struct reftable_record rec = { NULL };
- reftable_record_from_log(&rec, &log);
return reader_seek(r, it, &rec);
}
@@ -649,31 +650,33 @@ static int reftable_reader_refs_for_indexed(struct reftable_reader *r,
struct reftable_iterator *it,
uint8_t *oid)
{
- struct reftable_obj_record want = {
- .hash_prefix = oid,
- .hash_prefix_len = r->object_id_len,
+ struct reftable_record want = {
+ .type = BLOCK_TYPE_OBJ,
+ .u.obj = {
+ .hash_prefix = oid,
+ .hash_prefix_len = r->object_id_len,
+ },
};
- struct reftable_record want_rec = { NULL };
struct reftable_iterator oit = { NULL };
- struct reftable_obj_record got = { NULL };
- struct reftable_record got_rec = { NULL };
+ struct reftable_record got = {
+ .type = BLOCK_TYPE_OBJ,
+ .u.obj = { 0 },
+ };
int err = 0;
struct indexed_table_ref_iter *itr = NULL;
/* Look through the reverse index. */
- reftable_record_from_obj(&want_rec, &want);
- err = reader_seek(r, &oit, &want_rec);
+ err = reader_seek(r, &oit, &want);
if (err != 0)
goto done;
/* read out the reftable_obj_record */
- reftable_record_from_obj(&got_rec, &got);
- err = iterator_next(&oit, &got_rec);
+ err = iterator_next(&oit, &got);
if (err < 0)
goto done;
- if (err > 0 ||
- memcmp(want.hash_prefix, got.hash_prefix, r->object_id_len)) {
+ if (err > 0 || memcmp(want.u.obj.hash_prefix, got.u.obj.hash_prefix,
+ r->object_id_len)) {
/* didn't find it; return empty iterator */
iterator_set_empty(it);
err = 0;
@@ -681,15 +684,15 @@ static int reftable_reader_refs_for_indexed(struct reftable_reader *r,
}
err = new_indexed_table_ref_iter(&itr, r, oid, hash_size(r->hash_id),
- got.offsets, got.offset_len);
+ got.u.obj.offsets, got.u.obj.offset_len);
if (err < 0)
goto done;
- got.offsets = NULL;
+ got.u.obj.offsets = NULL;
iterator_from_indexed_table_ref_iter(it, itr);
done:
reftable_iterator_destroy(&oit);
- reftable_record_release(&got_rec);
+ reftable_record_release(&got);
return err;
}
diff --git a/reftable/record.c b/reftable/record.c
index 8bbcbff1e69..f766ee20ace 100644
--- a/reftable/record.c
+++ b/reftable/record.c
@@ -15,6 +15,10 @@ https://developers.google.com/open-source/licenses/bsd
#include "reftable-error.h"
#include "basics.h"
+static struct reftable_record_vtable *
+reftable_record_vtable(struct reftable_record *rec);
+static void *reftable_record_data(struct reftable_record *rec);
+
int get_var_int(uint64_t *dest, struct string_view *in)
{
int ptr = 0;
@@ -926,58 +930,6 @@ static struct reftable_record_vtable reftable_log_record_vtable = {
.is_deletion = &reftable_log_record_is_deletion_void,
};
-struct reftable_record reftable_new_record(uint8_t typ)
-{
- struct reftable_record rec = { NULL };
- switch (typ) {
- case BLOCK_TYPE_REF: {
- struct reftable_ref_record *r =
- reftable_calloc(sizeof(struct reftable_ref_record));
- reftable_record_from_ref(&rec, r);
- return rec;
- }
-
- case BLOCK_TYPE_OBJ: {
- struct reftable_obj_record *r =
- reftable_calloc(sizeof(struct reftable_obj_record));
- reftable_record_from_obj(&rec, r);
- return rec;
- }
- case BLOCK_TYPE_LOG: {
- struct reftable_log_record *r =
- reftable_calloc(sizeof(struct reftable_log_record));
- reftable_record_from_log(&rec, r);
- return rec;
- }
- case BLOCK_TYPE_INDEX: {
- struct reftable_index_record empty = { .last_key =
- STRBUF_INIT };
- struct reftable_index_record *r =
- reftable_calloc(sizeof(struct reftable_index_record));
- *r = empty;
- reftable_record_from_index(&rec, r);
- return rec;
- }
- }
- abort();
- return rec;
-}
-
-/* clear out the record, yielding the reftable_record data that was
- * encapsulated. */
-static void *reftable_record_yield(struct reftable_record *rec)
-{
- void *p = rec->data;
- rec->data = NULL;
- return p;
-}
-
-void reftable_record_destroy(struct reftable_record *rec)
-{
- reftable_record_release(rec);
- reftable_free(reftable_record_yield(rec));
-}
-
static void reftable_index_record_key(const void *r, struct strbuf *dest)
{
const struct reftable_index_record *rec = r;
@@ -1055,91 +1007,52 @@ static struct reftable_record_vtable reftable_index_record_vtable = {
void reftable_record_key(struct reftable_record *rec, struct strbuf *dest)
{
- rec->ops->key(rec->data, dest);
+ reftable_record_vtable(rec)->key(reftable_record_data(rec), dest);
}
uint8_t reftable_record_type(struct reftable_record *rec)
{
- return rec->ops->type;
+ return rec->type;
}
int reftable_record_encode(struct reftable_record *rec, struct string_view dest,
int hash_size)
{
- return rec->ops->encode(rec->data, dest, hash_size);
+ return reftable_record_vtable(rec)->encode(reftable_record_data(rec),
+ dest, hash_size);
}
void reftable_record_copy_from(struct reftable_record *rec,
struct reftable_record *src, int hash_size)
{
- assert(src->ops->type == rec->ops->type);
+ assert(src->type == rec->type);
- rec->ops->copy_from(rec->data, src->data, hash_size);
+ reftable_record_vtable(rec)->copy_from(reftable_record_data(rec),
+ reftable_record_data(src),
+ hash_size);
}
uint8_t reftable_record_val_type(struct reftable_record *rec)
{
- return rec->ops->val_type(rec->data);
+ return reftable_record_vtable(rec)->val_type(reftable_record_data(rec));
}
int reftable_record_decode(struct reftable_record *rec, struct strbuf key,
uint8_t extra, struct string_view src, int hash_size)
{
- return rec->ops->decode(rec->data, key, extra, src, hash_size);
+ return reftable_record_vtable(rec)->decode(reftable_record_data(rec),
+ key, extra, src, hash_size);
}
void reftable_record_release(struct reftable_record *rec)
{
- rec->ops->release(rec->data);
+ reftable_record_vtable(rec)->release(reftable_record_data(rec));
}
int reftable_record_is_deletion(struct reftable_record *rec)
{
- return rec->ops->is_deletion(rec->data);
-}
-
-void reftable_record_from_ref(struct reftable_record *rec,
- struct reftable_ref_record *ref_rec)
-{
- assert(!rec->ops);
- rec->data = ref_rec;
- rec->ops = &reftable_ref_record_vtable;
-}
-
-void reftable_record_from_obj(struct reftable_record *rec,
- struct reftable_obj_record *obj_rec)
-{
- assert(!rec->ops);
- rec->data = obj_rec;
- rec->ops = &reftable_obj_record_vtable;
-}
-
-void reftable_record_from_index(struct reftable_record *rec,
- struct reftable_index_record *index_rec)
-{
- assert(!rec->ops);
- rec->data = index_rec;
- rec->ops = &reftable_index_record_vtable;
-}
-
-void reftable_record_from_log(struct reftable_record *rec,
- struct reftable_log_record *log_rec)
-{
- assert(!rec->ops);
- rec->data = log_rec;
- rec->ops = &reftable_log_record_vtable;
-}
-
-struct reftable_ref_record *reftable_record_as_ref(struct reftable_record *rec)
-{
- assert(reftable_record_type(rec) == BLOCK_TYPE_REF);
- return rec->data;
-}
-
-struct reftable_log_record *reftable_record_as_log(struct reftable_record *rec)
-{
- assert(reftable_record_type(rec) == BLOCK_TYPE_LOG);
- return rec->data;
+ return reftable_record_vtable(rec)->is_deletion(
+ reftable_record_data(rec));
}
static int hash_equal(uint8_t *a, uint8_t *b, int hash_size)
@@ -1212,3 +1125,53 @@ void string_view_consume(struct string_view *s, int n)
s->buf += n;
s->len -= n;
}
+
+static void *reftable_record_data(struct reftable_record *rec)
+{
+ switch (rec->type) {
+ case BLOCK_TYPE_REF:
+ return &rec->u.ref;
+ case BLOCK_TYPE_LOG:
+ return &rec->u.log;
+ case BLOCK_TYPE_INDEX:
+ return &rec->u.idx;
+ case BLOCK_TYPE_OBJ:
+ return &rec->u.obj;
+ }
+ abort();
+}
+
+static struct reftable_record_vtable *
+reftable_record_vtable(struct reftable_record *rec)
+{
+ switch (rec->type) {
+ case BLOCK_TYPE_REF:
+ return &reftable_ref_record_vtable;
+ case BLOCK_TYPE_LOG:
+ return &reftable_log_record_vtable;
+ case BLOCK_TYPE_INDEX:
+ return &reftable_index_record_vtable;
+ case BLOCK_TYPE_OBJ:
+ return &reftable_obj_record_vtable;
+ }
+ abort();
+}
+
+struct reftable_record reftable_new_record(uint8_t typ)
+{
+ struct reftable_record clean_idx = {
+ .type = BLOCK_TYPE_INDEX,
+ .u.idx = {
+ .last_key = STRBUF_INIT,
+ },
+ };
+ struct reftable_record clean = {
+ .type = typ,
+ };
+
+ if (typ == BLOCK_TYPE_INDEX) {
+ return clean_idx;
+ }
+
+ return clean;
+}
diff --git a/reftable/record.h b/reftable/record.h
index 498e8c50bf4..407cdaba018 100644
--- a/reftable/record.h
+++ b/reftable/record.h
@@ -60,16 +60,10 @@ struct reftable_record_vtable {
int (*is_deletion)(const void *rec);
};
-/* record is a generic wrapper for different types of records. */
-struct reftable_record {
- void *data;
- struct reftable_record_vtable *ops;
-};
-
/* returns true for recognized block types. Block start with the block type. */
int reftable_is_block_type(uint8_t typ);
-/* creates a malloced record of the given type. Dispose with record_destroy */
+/* return an initialized record for the given type */
struct reftable_record reftable_new_record(uint8_t typ);
/* Encode `key` into `dest`. Sets `is_restart` to indicate a restart. Returns
@@ -97,6 +91,22 @@ struct reftable_obj_record {
int offset_len;
};
+/* record is a generic wrapper for different types of records. It is normally
+ * created on the stack, or embedded within another struct. If the type is
+ * known, a fresh instance can be initialized explicitly. Otherwise, use
+ * reftable_new_record() to initialize generically (as the index_record is not
+ * valid as 0-initialized structure)
+ */
+struct reftable_record {
+ uint8_t type;
+ union {
+ struct reftable_ref_record ref;
+ struct reftable_log_record log;
+ struct reftable_obj_record obj;
+ struct reftable_index_record idx;
+ } u;
+};
+
/* see struct record_vtable */
void reftable_record_key(struct reftable_record *rec, struct strbuf *dest);
@@ -111,25 +121,9 @@ int reftable_record_decode(struct reftable_record *rec, struct strbuf key,
int hash_size);
int reftable_record_is_deletion(struct reftable_record *rec);
-/* zeroes out the embedded record */
+/* frees and zeroes out the embedded record */
void reftable_record_release(struct reftable_record *rec);
-/* clear and deallocate embedded record, and zero `rec`. */
-void reftable_record_destroy(struct reftable_record *rec);
-
-/* initialize generic records from concrete records. The generic record should
- * be zeroed out. */
-void reftable_record_from_obj(struct reftable_record *rec,
- struct reftable_obj_record *objrec);
-void reftable_record_from_index(struct reftable_record *rec,
- struct reftable_index_record *idxrec);
-void reftable_record_from_ref(struct reftable_record *rec,
- struct reftable_ref_record *refrec);
-void reftable_record_from_log(struct reftable_record *rec,
- struct reftable_log_record *logrec);
-struct reftable_ref_record *reftable_record_as_ref(struct reftable_record *ref);
-struct reftable_log_record *reftable_record_as_log(struct reftable_record *ref);
-
/* for qsort. */
int reftable_ref_record_compare_name(const void *a, const void *b);
diff --git a/reftable/record_test.c b/reftable/record_test.c
index f4ad7cace41..96f65035c1b 100644
--- a/reftable/record_test.c
+++ b/reftable/record_test.c
@@ -16,24 +16,22 @@
static void test_copy(struct reftable_record *rec)
{
- struct reftable_record copy =
- reftable_new_record(reftable_record_type(rec));
+ struct reftable_record copy = reftable_new_record(reftable_record_type(rec));
+
reftable_record_copy_from(©, rec, GIT_SHA1_RAWSZ);
/* do it twice to catch memory leaks */
reftable_record_copy_from(©, rec, GIT_SHA1_RAWSZ);
- switch (reftable_record_type(©)) {
+ switch (copy.type) {
case BLOCK_TYPE_REF:
- EXPECT(reftable_ref_record_equal(reftable_record_as_ref(©),
- reftable_record_as_ref(rec),
+ EXPECT(reftable_ref_record_equal(©.u.ref, &rec->u.ref,
GIT_SHA1_RAWSZ));
break;
case BLOCK_TYPE_LOG:
- EXPECT(reftable_log_record_equal(reftable_record_as_log(©),
- reftable_record_as_log(rec),
+ EXPECT(reftable_log_record_equal(©.u.log, &rec->u.log,
GIT_SHA1_RAWSZ));
break;
}
- reftable_record_destroy(©);
+ reftable_record_release(©);
}
static void test_varint_roundtrip(void)
@@ -106,61 +104,60 @@ static void test_reftable_ref_record_roundtrip(void)
int i = 0;
for (i = REFTABLE_REF_DELETION; i < REFTABLE_NR_REF_VALUETYPES; i++) {
- struct reftable_ref_record in = { NULL };
- struct reftable_ref_record out = { NULL };
- struct reftable_record rec_out = { NULL };
+ struct reftable_record in = {
+ .type = BLOCK_TYPE_REF,
+ };
+ struct reftable_record out = {
+ .type = BLOCK_TYPE_REF
+ };
struct strbuf key = STRBUF_INIT;
- struct reftable_record rec = { NULL };
uint8_t buffer[1024] = { 0 };
struct string_view dest = {
.buf = buffer,
.len = sizeof(buffer),
};
-
int n, m;
- in.value_type = i;
+ in.u.ref.value_type = i;
switch (i) {
case REFTABLE_REF_DELETION:
break;
case REFTABLE_REF_VAL1:
- in.value.val1 = reftable_malloc(GIT_SHA1_RAWSZ);
- set_hash(in.value.val1, 1);
+ in.u.ref.value.val1 = reftable_malloc(GIT_SHA1_RAWSZ);
+ set_hash(in.u.ref.value.val1, 1);
break;
case REFTABLE_REF_VAL2:
- in.value.val2.value = reftable_malloc(GIT_SHA1_RAWSZ);
- set_hash(in.value.val2.value, 1);
- in.value.val2.target_value =
+ in.u.ref.value.val2.value =
+ reftable_malloc(GIT_SHA1_RAWSZ);
+ set_hash(in.u.ref.value.val2.value, 1);
+ in.u.ref.value.val2.target_value =
reftable_malloc(GIT_SHA1_RAWSZ);
- set_hash(in.value.val2.target_value, 2);
+ set_hash(in.u.ref.value.val2.target_value, 2);
break;
case REFTABLE_REF_SYMREF:
- in.value.symref = xstrdup("target");
+ in.u.ref.value.symref = xstrdup("target");
break;
}
- in.refname = xstrdup("refs/heads/master");
+ in.u.ref.refname = xstrdup("refs/heads/master");
- reftable_record_from_ref(&rec, &in);
- test_copy(&rec);
+ test_copy(&in);
- EXPECT(reftable_record_val_type(&rec) == i);
+ EXPECT(reftable_record_val_type(&in) == i);
- reftable_record_key(&rec, &key);
- n = reftable_record_encode(&rec, dest, GIT_SHA1_RAWSZ);
+ reftable_record_key(&in, &key);
+ n = reftable_record_encode(&in, dest, GIT_SHA1_RAWSZ);
EXPECT(n > 0);
/* decode into a non-zero reftable_record to test for leaks. */
-
- reftable_record_from_ref(&rec_out, &out);
- m = reftable_record_decode(&rec_out, key, i, dest,
- GIT_SHA1_RAWSZ);
+ m = reftable_record_decode(&out, key, i, dest, GIT_SHA1_RAWSZ);
EXPECT(n == m);
- EXPECT(reftable_ref_record_equal(&in, &out, GIT_SHA1_RAWSZ));
- reftable_record_release(&rec_out);
+ EXPECT(reftable_ref_record_equal(&in.u.ref, &out.u.ref,
+ GIT_SHA1_RAWSZ));
+ reftable_record_release(&in);
strbuf_release(&key);
- reftable_ref_record_release(&in);
+ reftable_record_release(&out);
}
}
@@ -213,7 +210,9 @@ static void test_reftable_log_record_roundtrip(void)
set_test_hash(in[0].value.update.new_hash, 1);
set_test_hash(in[0].value.update.old_hash, 2);
for (i = 0; i < ARRAY_SIZE(in); i++) {
- struct reftable_record rec = { NULL };
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_LOG
+ };
struct strbuf key = STRBUF_INIT;
uint8_t buffer[1024] = { 0 };
struct string_view dest = {
@@ -221,23 +220,25 @@ static void test_reftable_log_record_roundtrip(void)
.len = sizeof(buffer),
};
/* populate out, to check for leaks. */
- struct reftable_log_record out = {
- .refname = xstrdup("old name"),
- .value_type = REFTABLE_LOG_UPDATE,
- .value = {
- .update = {
- .new_hash = reftable_calloc(GIT_SHA1_RAWSZ),
- .old_hash = reftable_calloc(GIT_SHA1_RAWSZ),
- .name = xstrdup("old name"),
- .email = xstrdup("old@email"),
- .message = xstrdup("old message"),
+ struct reftable_record out = {
+ .type = BLOCK_TYPE_LOG,
+ .u.log = {
+ .refname = xstrdup("old name"),
+ .value_type = REFTABLE_LOG_UPDATE,
+ .value = {
+ .update = {
+ .new_hash = reftable_calloc(GIT_SHA1_RAWSZ),
+ .old_hash = reftable_calloc(GIT_SHA1_RAWSZ),
+ .name = xstrdup("old name"),
+ .email = xstrdup("old@email"),
+ .message = xstrdup("old message"),
+ },
},
},
};
- struct reftable_record rec_out = { NULL };
int n, m, valtype;
- reftable_record_from_log(&rec, &in[i]);
+ rec.u.log = in[i];
test_copy(&rec);
@@ -245,16 +246,16 @@ static void test_reftable_log_record_roundtrip(void)
n = reftable_record_encode(&rec, dest, GIT_SHA1_RAWSZ);
EXPECT(n >= 0);
- reftable_record_from_log(&rec_out, &out);
valtype = reftable_record_val_type(&rec);
- m = reftable_record_decode(&rec_out, key, valtype, dest,
+ m = reftable_record_decode(&out, key, valtype, dest,
GIT_SHA1_RAWSZ);
EXPECT(n == m);
- EXPECT(reftable_log_record_equal(&in[i], &out, GIT_SHA1_RAWSZ));
+ EXPECT(reftable_log_record_equal(&in[i], &out.u.log,
+ GIT_SHA1_RAWSZ));
reftable_log_record_release(&in[i]);
strbuf_release(&key);
- reftable_record_release(&rec_out);
+ reftable_record_release(&out);
}
}
@@ -322,47 +323,52 @@ static void test_reftable_obj_record_roundtrip(void)
} };
int i = 0;
for (i = 0; i < ARRAY_SIZE(recs); i++) {
- struct reftable_obj_record in = recs[i];
uint8_t buffer[1024] = { 0 };
struct string_view dest = {
.buf = buffer,
.len = sizeof(buffer),
};
- struct reftable_record rec = { NULL };
+ struct reftable_record in = {
+ .type = BLOCK_TYPE_OBJ,
+ .u.obj = recs[i],
+ };
struct strbuf key = STRBUF_INIT;
- struct reftable_obj_record out = { NULL };
- struct reftable_record rec_out = { NULL };
+ struct reftable_record out = {
+ .type = BLOCK_TYPE_OBJ
+ };
int n, m;
uint8_t extra;
- reftable_record_from_obj(&rec, &in);
- test_copy(&rec);
- reftable_record_key(&rec, &key);
- n = reftable_record_encode(&rec, dest, GIT_SHA1_RAWSZ);
+ test_copy(&in);
+ reftable_record_key(&in, &key);
+ n = reftable_record_encode(&in, dest, GIT_SHA1_RAWSZ);
EXPECT(n > 0);
- extra = reftable_record_val_type(&rec);
- reftable_record_from_obj(&rec_out, &out);
- m = reftable_record_decode(&rec_out, key, extra, dest,
+ extra = reftable_record_val_type(&in);
+ m = reftable_record_decode(&out, key, extra, dest,
GIT_SHA1_RAWSZ);
EXPECT(n == m);
- EXPECT(in.hash_prefix_len == out.hash_prefix_len);
- EXPECT(in.offset_len == out.offset_len);
-
- EXPECT(!memcmp(in.hash_prefix, out.hash_prefix,
- in.hash_prefix_len));
- EXPECT(0 == memcmp(in.offsets, out.offsets,
- sizeof(uint64_t) * in.offset_len));
+ EXPECT(in.u.obj.hash_prefix_len == out.u.obj.hash_prefix_len);
+ EXPECT(in.u.obj.offset_len == out.u.obj.offset_len);
+ if (in.u.obj.hash_prefix_len)
+ EXPECT(!memcmp(in.u.obj.hash_prefix, out.u.obj.hash_prefix,
+ in.u.obj.hash_prefix_len));
+ if (in.u.obj.offset_len)
+ EXPECT(!memcmp(in.u.obj.offsets, out.u.obj.offsets,
+ sizeof(uint64_t) * in.u.obj.offset_len));
strbuf_release(&key);
- reftable_record_release(&rec_out);
+ reftable_record_release(&out);
}
}
static void test_reftable_index_record_roundtrip(void)
{
- struct reftable_index_record in = {
- .offset = 42,
- .last_key = STRBUF_INIT,
+ struct reftable_record in = {
+ .type = BLOCK_TYPE_INDEX,
+ .u.idx = {
+ .offset = 42,
+ .last_key = STRBUF_INIT,
+ },
};
uint8_t buffer[1024] = { 0 };
struct string_view dest = {
@@ -370,31 +376,30 @@ static void test_reftable_index_record_roundtrip(void)
.len = sizeof(buffer),
};
struct strbuf key = STRBUF_INIT;
- struct reftable_record rec = { NULL };
- struct reftable_index_record out = { .last_key = STRBUF_INIT };
- struct reftable_record out_rec = { NULL };
+ struct reftable_record out = {
+ .type = BLOCK_TYPE_INDEX,
+ .u.idx = { .last_key = STRBUF_INIT },
+ };
int n, m;
uint8_t extra;
- strbuf_addstr(&in.last_key, "refs/heads/master");
- reftable_record_from_index(&rec, &in);
- reftable_record_key(&rec, &key);
- test_copy(&rec);
+ strbuf_addstr(&in.u.idx.last_key, "refs/heads/master");
+ reftable_record_key(&in, &key);
+ test_copy(&in);
- EXPECT(0 == strbuf_cmp(&key, &in.last_key));
- n = reftable_record_encode(&rec, dest, GIT_SHA1_RAWSZ);
+ EXPECT(0 == strbuf_cmp(&key, &in.u.idx.last_key));
+ n = reftable_record_encode(&in, dest, GIT_SHA1_RAWSZ);
EXPECT(n > 0);
- extra = reftable_record_val_type(&rec);
- reftable_record_from_index(&out_rec, &out);
- m = reftable_record_decode(&out_rec, key, extra, dest, GIT_SHA1_RAWSZ);
+ extra = reftable_record_val_type(&in);
+ m = reftable_record_decode(&out, key, extra, dest, GIT_SHA1_RAWSZ);
EXPECT(m == n);
- EXPECT(in.offset == out.offset);
+ EXPECT(in.u.idx.offset == out.u.idx.offset);
- reftable_record_release(&out_rec);
+ reftable_record_release(&out);
strbuf_release(&key);
- strbuf_release(&in.last_key);
+ strbuf_release(&in.u.idx.last_key);
}
int record_test_main(int argc, const char *argv[])
diff --git a/reftable/writer.c b/reftable/writer.c
index 3ca721e9f64..990f78ff7ed 100644
--- a/reftable/writer.c
+++ b/reftable/writer.c
@@ -251,8 +251,10 @@ done:
int reftable_writer_add_ref(struct reftable_writer *w,
struct reftable_ref_record *ref)
{
- struct reftable_record rec = { NULL };
- struct reftable_ref_record copy = *ref;
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_REF,
+ .u.ref = *ref,
+ };
int err = 0;
if (ref->refname == NULL)
@@ -261,8 +263,7 @@ int reftable_writer_add_ref(struct reftable_writer *w,
ref->update_index > w->max_update_index)
return REFTABLE_API_ERROR;
- reftable_record_from_ref(&rec, ©);
- copy.update_index -= w->min_update_index;
+ rec.u.ref.update_index -= w->min_update_index;
err = writer_add_record(w, &rec);
if (err < 0)
@@ -301,7 +302,10 @@ int reftable_writer_add_refs(struct reftable_writer *w,
static int reftable_writer_add_log_verbatim(struct reftable_writer *w,
struct reftable_log_record *log)
{
- struct reftable_record rec = { NULL };
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_LOG,
+ .u.log = *log,
+ };
if (w->block_writer &&
block_writer_type(w->block_writer) == BLOCK_TYPE_REF) {
int err = writer_finish_public_section(w);
@@ -311,8 +315,6 @@ static int reftable_writer_add_log_verbatim(struct reftable_writer *w,
w->next -= w->pending_padding;
w->pending_padding = 0;
-
- reftable_record_from_log(&rec, log);
return writer_add_record(w, &rec);
}
@@ -393,8 +395,10 @@ static int writer_finish_section(struct reftable_writer *w)
w->index_len = 0;
w->index_cap = 0;
for (i = 0; i < idx_len; i++) {
- struct reftable_record rec = { NULL };
- reftable_record_from_index(&rec, idx + i);
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_INDEX,
+ .u.idx = idx[i],
+ };
if (block_writer_add(w->block_writer, &rec) == 0) {
continue;
}
@@ -462,17 +466,18 @@ static void write_object_record(void *void_arg, void *key)
{
struct write_record_arg *arg = void_arg;
struct obj_index_tree_node *entry = key;
- struct reftable_obj_record obj_rec = {
- .hash_prefix = (uint8_t *)entry->hash.buf,
- .hash_prefix_len = arg->w->stats.object_id_len,
- .offsets = entry->offsets,
- .offset_len = entry->offset_len,
+ struct reftable_record rec = {
+ .type = BLOCK_TYPE_OBJ,
+ .u.obj = {
+ .hash_prefix = (uint8_t *)entry->hash.buf,
+ .hash_prefix_len = arg->w->stats.object_id_len,
+ .offsets = entry->offsets,
+ .offset_len = entry->offset_len,
+ }
};
- struct reftable_record rec = { NULL };
if (arg->err < 0)
goto done;
- reftable_record_from_obj(&rec, &obj_rec);
arg->err = block_writer_add(arg->w->block_writer, &rec);
if (arg->err == 0)
goto done;
@@ -485,7 +490,8 @@ static void write_object_record(void *void_arg, void *key)
arg->err = block_writer_add(arg->w->block_writer, &rec);
if (arg->err == 0)
goto done;
- obj_rec.offset_len = 0;
+
+ rec.u.obj.offset_len = 0;
arg->err = block_writer_add(arg->w->block_writer, &rec);
/* Should be able to write into a fresh block. */
--
gitgitgadget
