reftable: drop generic `reftable_table` interface

index 6adce44f4b..8d78b3da71 100644
@@ -254,6 +254,18 @@ void merged_table_init_iter(struct reftable_merged_table *mt,
 	iterator_from_merged_iter(it, mi);
 }
 
+void reftable_merged_table_init_ref_iterator(struct reftable_merged_table *mt,
+					     struct reftable_iterator *it)
+{
+	merged_table_init_iter(mt, it, BLOCK_TYPE_REF);
+}
+
+void reftable_merged_table_init_log_iterator(struct reftable_merged_table *mt,
+					     struct reftable_iterator *it)
+{
+	merged_table_init_iter(mt, it, BLOCK_TYPE_LOG);
+}
+
 uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *mt)
 {
 	return mt->hash_id;

index 14d5fc9f05..4deb0ad22e 100644
@@ -36,6 +36,14 @@ int reftable_new_merged_table(struct reftable_merged_table **dest,
 			      struct reftable_table *stack, size_t n,
 			      uint32_t hash_id);
 
+/* Initialize a merged table iterator for reading refs. */
+void reftable_merged_table_init_ref_iterator(struct reftable_merged_table *mt,
+					     struct reftable_iterator *it);
+
+/* Initialize a merged table iterator for reading logs. */
+void reftable_merged_table_init_log_iterator(struct reftable_merged_table *mt,
+					     struct reftable_iterator *it);
+
 /* returns the max update_index covered by this merged table. */
 uint64_t
 reftable_merged_table_max_update_index(struct reftable_merged_table *mt);

index 8d78b3da71..25d414ec41 100644
@@ -192,7 +192,7 @@ static void iterator_from_merged_iter(struct reftable_iterator *it,
 	it->ops = &merged_iter_vtable;
 }
 
-int reftable_new_merged_table(struct reftable_merged_table **dest,
+int reftable_merged_table_new(struct reftable_merged_table **dest,
 			      struct reftable_table *stack, size_t n,
 			      uint32_t hash_id)
 {

index 4deb0ad22e..72762483b9 100644
@@ -29,10 +29,11 @@ struct reftable_merged_table;
 /* A generic reftable; see below. */
 struct reftable_table;
 
-/* reftable_new_merged_table creates a new merged table. It takes ownership of
-   the stack array.
-*/
-int reftable_new_merged_table(struct reftable_merged_table **dest,
+/*
+ * reftable_merged_table_new creates a new merged table. It takes ownership of
+ * the stack array.
+ */
+int reftable_merged_table_new(struct reftable_merged_table **dest,
 			      struct reftable_table *stack, size_t n,
 			      uint32_t hash_id);
 

index 2071e428a8..64c7fdf8c4 100644
@@ -272,7 +272,7 @@ static int reftable_stack_reload_once(struct reftable_stack *st,
 	}
 
 	/* success! */
-	err = reftable_new_merged_table(&new_merged, new_tables,
+	err = reftable_merged_table_new(&new_merged, new_tables,
 					new_readers_len, st->opts.hash_id);
 	if (err < 0)
 		goto done;

@@ -924,7 +924,7 @@ static int stack_write_compact(struct reftable_stack *st,
 	reftable_writer_set_limits(wr, st->readers[first]->min_update_index,
 				   st->readers[last]->max_update_index);
 
-	err = reftable_new_merged_table(&mt, subtabs, subtabs_len,
+	err = reftable_merged_table_new(&mt, subtabs, subtabs_len,
 					st->opts.hash_id);
 	if (err < 0) {
 		reftable_free(subtabs);

index b6263ee8b5..210603e8c7 100644
@@ -111,7 +111,7 @@ merged_table_from_records(struct reftable_ref_record **refs,
 		reftable_table_from_reader(&tabs[i], (*readers)[i]);
 	}
 
-	err = reftable_new_merged_table(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
+	err = reftable_merged_table_new(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
 	check(!err);
 	return mt;
 }

@@ -289,7 +289,7 @@ merged_table_from_log_records(struct reftable_log_record **logs,
 		reftable_table_from_reader(&tabs[i], (*readers)[i]);
 	}
 
-	err = reftable_new_merged_table(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
+	err = reftable_merged_table_new(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
 	check(!err);
 	return mt;
 }

@@ -441,9 +441,9 @@ static void t_default_write_opts(void)
 	check_int(hash_id, ==, GIT_SHA1_FORMAT_ID);
 
 	reftable_table_from_reader(&tab[0], rd);
-	err = reftable_new_merged_table(&merged, tab, 1, GIT_SHA256_FORMAT_ID);
+	err = reftable_merged_table_new(&merged, tab, 1, GIT_SHA256_FORMAT_ID);
 	check_int(err, ==, REFTABLE_FORMAT_ERROR);
-	err = reftable_new_merged_table(&merged, tab, 1, GIT_SHA1_FORMAT_ID);
+	err = reftable_merged_table_new(&merged, tab, 1, GIT_SHA1_FORMAT_ID);
 	check(!err);
 
 	reftable_reader_free(rd);

index 25d414ec41..2e72eab306 100644
@@ -11,6 +11,7 @@ license that can be found in the LICENSE file or at
 #include "constants.h"
 #include "iter.h"
 #include "pq.h"
+#include "reader.h"
 #include "record.h"
 #include "generic.h"
 #include "reftable-merged.h"

@@ -25,7 +26,7 @@ struct merged_subiter {
 struct merged_iter {
 	struct merged_subiter *subiters;
 	struct merged_iter_pqueue pq;
-	size_t stack_len;
+	size_t subiters_len;
 	int suppress_deletions;
 	ssize_t advance_index;
 };

@@ -38,12 +39,12 @@ static void merged_iter_init(struct merged_iter *mi,
 	mi->advance_index = -1;
 	mi->suppress_deletions = mt->suppress_deletions;
 
-	REFTABLE_CALLOC_ARRAY(mi->subiters, mt->stack_len);
-	for (size_t i = 0; i < mt->stack_len; i++) {
+	REFTABLE_CALLOC_ARRAY(mi->subiters, mt->readers_len);
+	for (size_t i = 0; i < mt->readers_len; i++) {
 		reftable_record_init(&mi->subiters[i].rec, typ);
-		table_init_iter(&mt->stack[i], &mi->subiters[i].iter, typ);
+		reader_init_iter(mt->readers[i], &mi->subiters[i].iter, typ);
 	}
-	mi->stack_len = mt->stack_len;
+	mi->subiters_len = mt->readers_len;
 }
 
 static void merged_iter_close(void *p)

@@ -51,7 +52,7 @@ static void merged_iter_close(void *p)
 	struct merged_iter *mi = p;
 
 	merged_iter_pqueue_release(&mi->pq);
-	for (size_t i = 0; i < mi->stack_len; i++) {
+	for (size_t i = 0; i < mi->subiters_len; i++) {
 		reftable_iterator_destroy(&mi->subiters[i].iter);
 		reftable_record_release(&mi->subiters[i].rec);
 	}

@@ -80,7 +81,7 @@ static int merged_iter_seek(struct merged_iter *mi, struct reftable_record *want
 
 	mi->advance_index = -1;
 
-	for (size_t i = 0; i < mi->stack_len; i++) {
+	for (size_t i = 0; i < mi->subiters_len; i++) {
 		err = iterator_seek(&mi->subiters[i].iter, want);
 		if (err < 0)
 			return err;

@@ -193,7 +194,7 @@ static void iterator_from_merged_iter(struct reftable_iterator *it,
 }
 
 int reftable_merged_table_new(struct reftable_merged_table **dest,
-			      struct reftable_table *stack, size_t n,
+			      struct reftable_reader **readers, size_t n,
 			      uint32_t hash_id)
 {
 	struct reftable_merged_table *m = NULL;

@@ -201,10 +202,10 @@ int reftable_merged_table_new(struct reftable_merged_table **dest,
 	uint64_t first_min = 0;
 
 	for (size_t i = 0; i < n; i++) {
-		uint64_t min = reftable_table_min_update_index(&stack[i]);
-		uint64_t max = reftable_table_max_update_index(&stack[i]);
+		uint64_t min = reftable_reader_min_update_index(readers[i]);
+		uint64_t max = reftable_reader_max_update_index(readers[i]);
 
-		if (reftable_table_hash_id(&stack[i]) != hash_id) {
+		if (reftable_reader_hash_id(readers[i]) != hash_id) {
 			return REFTABLE_FORMAT_ERROR;
 		}
 		if (i == 0 || min < first_min) {

@@ -216,8 +217,8 @@ int reftable_merged_table_new(struct reftable_merged_table **dest,
 	}
 
 	REFTABLE_CALLOC_ARRAY(m, 1);
-	m->stack = stack;
-	m->stack_len = n;
+	m->readers = readers;
+	m->readers_len = n;
 	m->min = first_min;
 	m->max = last_max;
 	m->hash_id = hash_id;

@@ -229,7 +230,6 @@ void reftable_merged_table_free(struct reftable_merged_table *mt)
 {
 	if (!mt)
 		return;
-	FREE_AND_NULL(mt->stack);
 	reftable_free(mt);
 }
 

index 2efe571da6..de5fd33f01 100644
@@ -12,8 +12,8 @@ license that can be found in the LICENSE file or at
 #include "system.h"
 
 struct reftable_merged_table {
-	struct reftable_table *stack;
-	size_t stack_len;
+	struct reftable_reader **readers;
+	size_t readers_len;
 	uint32_t hash_id;
 
 	/* If unset, produce deletions. This is useful for compaction. For the

index 29c99e2269..f7ae35da72 100644
@@ -605,9 +605,9 @@ static void iterator_from_table_iter(struct reftable_iterator *it,
 	it->ops = &table_iter_vtable;
 }
 
-static void reader_init_iter(struct reftable_reader *r,
-			     struct reftable_iterator *it,
-			     uint8_t typ)
+void reader_init_iter(struct reftable_reader *r,
+		      struct reftable_iterator *it,
+		      uint8_t typ)
 {
 	struct reftable_reader_offsets *offs = reader_offsets_for(r, typ);
 

index e869165f23..a2c204d523 100644
@@ -57,6 +57,10 @@ int init_reader(struct reftable_reader *r, struct reftable_block_source *source,
 void reader_close(struct reftable_reader *r);
 const char *reader_name(struct reftable_reader *r);
 
+void reader_init_iter(struct reftable_reader *r,
+		      struct reftable_iterator *it,
+		      uint8_t typ);
+
 /* initialize a block reader to read from `r` */
 int reader_init_block_reader(struct reftable_reader *r, struct block_reader *br,
 			     uint64_t next_off, uint8_t want_typ);

index 72762483b9..03c2619c0f 100644
@@ -28,13 +28,14 @@ struct reftable_merged_table;
 
 /* A generic reftable; see below. */
 struct reftable_table;
+struct reftable_reader;
 
 /*
- * reftable_merged_table_new creates a new merged table. It takes ownership of
- * the stack array.
+ * reftable_merged_table_new creates a new merged table. The readers must be
+ * kept alive as long as the merged table is still in use.
  */
 int reftable_merged_table_new(struct reftable_merged_table **dest,
-			      struct reftable_table *stack, size_t n,
+			      struct reftable_reader **readers, size_t n,
 			      uint32_t hash_id);
 
 /* Initialize a merged table iterator for reading refs. */

146 lines not on this page · raw message

index 8c36590ff0..dbca9eaf4a 100644
@@ -347,9 +347,9 @@ static void test_reftable_stack_transaction_api_performs_auto_compaction(void)
 		 * all tables in the stack.
 		 */
 		if (i != n)
-			EXPECT(st->merged->stack_len == i + 1);
+			EXPECT(st->merged->readers_len == i + 1);
 		else
-			EXPECT(st->merged->stack_len == 1);
+			EXPECT(st->merged->readers_len == 1);
 	}
 
 	reftable_stack_destroy(st);

@@ -375,7 +375,7 @@ static void test_reftable_stack_auto_compaction_fails_gracefully(void)
 
 	err = reftable_stack_add(st, write_test_ref, &ref);
 	EXPECT_ERR(err);
-	EXPECT(st->merged->stack_len == 1);
+	EXPECT(st->merged->readers_len == 1);
 	EXPECT(st->stats.attempts == 0);
 	EXPECT(st->stats.failures == 0);
 

@@ -390,7 +390,7 @@ static void test_reftable_stack_auto_compaction_fails_gracefully(void)
 	ref.update_index = 2;
 	err = reftable_stack_add(st, write_test_ref, &ref);
 	EXPECT_ERR(err);
-	EXPECT(st->merged->stack_len == 2);
+	EXPECT(st->merged->readers_len == 2);
 	EXPECT(st->stats.attempts == 1);
 	EXPECT(st->stats.failures == 1);
 

@@ -881,7 +881,7 @@ static void test_reftable_stack_auto_compaction(void)
 
 		err = reftable_stack_auto_compact(st);
 		EXPECT_ERR(err);
-		EXPECT(i < 3 || st->merged->stack_len < 2 * fastlog2(i));
+		EXPECT(i < 3 || st->merged->readers_len < 2 * fastlog2(i));
 	}
 
 	EXPECT(reftable_stack_compaction_stats(st)->entries_written <

@@ -905,7 +905,7 @@ static void test_reftable_stack_auto_compaction_with_locked_tables(void)
 	EXPECT_ERR(err);
 
 	write_n_ref_tables(st, 5);
-	EXPECT(st->merged->stack_len == 5);
+	EXPECT(st->merged->readers_len == 5);
 
 	/*
 	 * Given that all tables we have written should be roughly the same

@@ -925,7 +925,7 @@ static void test_reftable_stack_auto_compaction_with_locked_tables(void)
 	err = reftable_stack_auto_compact(st);
 	EXPECT_ERR(err);
 	EXPECT(st->stats.failures == 0);
-	EXPECT(st->merged->stack_len == 4);
+	EXPECT(st->merged->readers_len == 4);
 
 	reftable_stack_destroy(st);
 	strbuf_release(&buf);

@@ -970,9 +970,9 @@ static void test_reftable_stack_add_performs_auto_compaction(void)
 		 * all tables in the stack.
 		 */
 		if (i != n)
-			EXPECT(st->merged->stack_len == i + 1);
+			EXPECT(st->merged->readers_len == i + 1);
 		else
-			EXPECT(st->merged->stack_len == 1);
+			EXPECT(st->merged->readers_len == 1);
 	}
 
 	reftable_stack_destroy(st);

@@ -994,7 +994,7 @@ static void test_reftable_stack_compaction_with_locked_tables(void)
 	EXPECT_ERR(err);
 
 	write_n_ref_tables(st, 3);
-	EXPECT(st->merged->stack_len == 3);
+	EXPECT(st->merged->readers_len == 3);
 
 	/* Lock one of the tables that we're about to compact. */
 	strbuf_reset(&buf);

@@ -1008,7 +1008,7 @@ static void test_reftable_stack_compaction_with_locked_tables(void)
 	err = reftable_stack_compact_all(st, NULL);
 	EXPECT(err == REFTABLE_LOCK_ERROR);
 	EXPECT(st->stats.failures == 1);
-	EXPECT(st->merged->stack_len == 3);
+	EXPECT(st->merged->readers_len == 3);
 
 	reftable_stack_destroy(st);
 	strbuf_release(&buf);

index 210603e8c7..577b1a5be8 100644
@@ -94,10 +94,8 @@ merged_table_from_records(struct reftable_ref_record **refs,
 			  struct strbuf *buf, const size_t n)
 {
 	struct reftable_merged_table *mt = NULL;
-	struct reftable_table *tabs;
 	int err;
 
-	REFTABLE_CALLOC_ARRAY(tabs, n);
 	REFTABLE_CALLOC_ARRAY(*readers, n);
 	REFTABLE_CALLOC_ARRAY(*source, n);
 

@@ -108,10 +106,9 @@ merged_table_from_records(struct reftable_ref_record **refs,
 		err = reftable_new_reader(&(*readers)[i], &(*source)[i],
 					  "name");
 		check(!err);
-		reftable_table_from_reader(&tabs[i], (*readers)[i]);
 	}
 
-	err = reftable_merged_table_new(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
+	err = reftable_merged_table_new(&mt, *readers, n, GIT_SHA1_FORMAT_ID);
 	check(!err);
 	return mt;
 }

@@ -272,10 +269,8 @@ merged_table_from_log_records(struct reftable_log_record **logs,
 			      struct strbuf *buf, const size_t n)
 {
 	struct reftable_merged_table *mt = NULL;
-	struct reftable_table *tabs;
 	int err;
 
-	REFTABLE_CALLOC_ARRAY(tabs, n);
 	REFTABLE_CALLOC_ARRAY(*readers, n);
 	REFTABLE_CALLOC_ARRAY(*source, n);
 

@@ -286,10 +281,9 @@ merged_table_from_log_records(struct reftable_log_record **logs,
 		err = reftable_new_reader(&(*readers)[i], &(*source)[i],
 					  "name");
 		check(!err);
-		reftable_table_from_reader(&tabs[i], (*readers)[i]);
 	}
 
-	err = reftable_merged_table_new(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
+	err = reftable_merged_table_new(&mt, *readers, n, GIT_SHA1_FORMAT_ID);
 	check(!err);
 	return mt;
 }

@@ -418,7 +412,6 @@ static void t_default_write_opts(void)
 	};
 	int err;
 	struct reftable_block_source source = { 0 };
-	struct reftable_table *tab = reftable_calloc(1, sizeof(*tab));
 	uint32_t hash_id;
 	struct reftable_reader *rd = NULL;
 	struct reftable_merged_table *merged = NULL;

@@ -440,10 +433,9 @@ static void t_default_write_opts(void)
 	hash_id = reftable_reader_hash_id(rd);
 	check_int(hash_id, ==, GIT_SHA1_FORMAT_ID);
 
-	reftable_table_from_reader(&tab[0], rd);
-	err = reftable_merged_table_new(&merged, tab, 1, GIT_SHA256_FORMAT_ID);
+	err = reftable_merged_table_new(&merged, &rd, 1, GIT_SHA256_FORMAT_ID);
 	check_int(err, ==, REFTABLE_FORMAT_ERROR);
-	err = reftable_merged_table_new(&merged, tab, 1, GIT_SHA1_FORMAT_ID);
+	err = reftable_merged_table_new(&merged, &rd, 1, GIT_SHA1_FORMAT_ID);
 	check(!err);
 
 	reftable_reader_free(rd);

index 7f4e267ea9..d08ec00959 100644
@@ -1468,9 +1468,28 @@ reftable_stack_compaction_stats(struct reftable_stack *st)
 int reftable_stack_read_ref(struct reftable_stack *st, const char *refname,
 			    struct reftable_ref_record *ref)
 {
-	struct reftable_table tab = { NULL };
-	reftable_table_from_merged_table(&tab, reftable_stack_merged_table(st));
-	return reftable_table_read_ref(&tab, refname, ref);
+	struct reftable_iterator it = { 0 };
+	int ret;
+
+	reftable_merged_table_init_ref_iterator(st->merged, &it);
+	ret = reftable_iterator_seek_ref(&it, refname);
+	if (ret)
+		goto out;
+
+	ret = reftable_iterator_next_ref(&it, ref);
+	if (ret)
+		goto out;
+
+	if (strcmp(ref->refname, refname) ||
+	    reftable_ref_record_is_deletion(ref)) {
+		reftable_ref_record_release(ref);
+		ret = 1;
+		goto out;
+	}
+
+out:
+	reftable_iterator_destroy(&it);
+	return ret;
 }
 
 int reftable_stack_read_log(struct reftable_stack *st, const char *refname,

index fddea31e51..a7484aba60 100644
@@ -42,26 +42,6 @@ static int filtering_ref_iterator_next(void *iter_arg,
 			break;
 		}
 
-		if (fri->double_check) {
-			struct reftable_iterator it = { NULL };
-
-			reftable_table_init_ref_iter(&fri->tab, &it);
-
-			err = reftable_iterator_seek_ref(&it, ref->refname);
-			if (err == 0)
-				err = reftable_iterator_next_ref(&it, ref);
-
-			reftable_iterator_destroy(&it);
-
-			if (err < 0) {
-				break;
-			}
-
-			if (err > 0) {
-				continue;
-			}
-		}
-
 		if (ref->value_type == REFTABLE_REF_VAL2 &&
 		    (!memcmp(fri->oid.buf, ref->value.val2.target_value,
 			     fri->oid.len) ||

index 537431baba..b75d7ac2ac 100644
@@ -18,8 +18,6 @@ license that can be found in the LICENSE file or at
 
 /* iterator that produces only ref records that point to `oid` */
 struct filtering_ref_iterator {
-	int double_check;
-	struct reftable_table tab;
 	struct strbuf oid;
 	struct reftable_iterator it;
 };

index f7ae35da72..e3f5854229 100644
@@ -735,8 +735,6 @@ static int reftable_reader_refs_for_unindexed(struct reftable_reader *r,
 	*filter = empty;
 
 	strbuf_add(&filter->oid, oid, oid_len);
-	reftable_table_from_reader(&filter->tab, r);
-	filter->double_check = 0;
 	iterator_from_table_iter(&filter->it, ti);
 
 	iterator_from_filtering_ref_iterator(it, filter);

index 28ae26145e..6ecf9b880f 100644
@@ -9,6 +9,7 @@ license that can be found in the LICENSE file or at
 #include "constants.h"
 #include "record.h"
 #include "generic.h"
+#include "iter.h"
 #include "reftable-iterator.h"
 #include "reftable-generic.h"
 

@@ -32,37 +33,6 @@ void reftable_table_init_log_iter(struct reftable_table *tab,
 	table_init_iter(tab, it, BLOCK_TYPE_LOG);
 }
 
-int reftable_iterator_seek_ref(struct reftable_iterator *it,
-			       const char *name)
-{
-	struct reftable_record want = {
-		.type = BLOCK_TYPE_REF,
-		.u.ref = {
-			.refname = (char *)name,
-		},
-	};
-	return it->ops->seek(it->iter_arg, &want);
-}
-
-int reftable_iterator_seek_log_at(struct reftable_iterator *it,
-				  const char *name, uint64_t update_index)
-{
-	struct reftable_record want = {
-		.type = BLOCK_TYPE_LOG,
-		.u.log = {
-			.refname = (char *)name,
-			.update_index = update_index,
-		},
-	};
-	return it->ops->seek(it->iter_arg, &want);
-}
-
-int reftable_iterator_seek_log(struct reftable_iterator *it,
-			       const char *name)
-{
-	return reftable_iterator_seek_log_at(it, name, ~((uint64_t) 0));
-}
-
 int reftable_table_read_ref(struct reftable_table *tab, const char *name,
 			    struct reftable_ref_record *ref)
 {

@@ -152,78 +122,3 @@ uint32_t reftable_table_hash_id(struct reftable_table *tab)
 {
 	return tab->ops->hash_id(tab->table_arg);
 }
-
-void reftable_iterator_destroy(struct reftable_iterator *it)
-{
-	if (!it->ops) {
-		return;
-	}
-	it->ops->close(it->iter_arg);
-	it->ops = NULL;
-	FREE_AND_NULL(it->iter_arg);
-}
-
-int reftable_iterator_next_ref(struct reftable_iterator *it,
-			       struct reftable_ref_record *ref)
-{
-	struct reftable_record rec = {
-		.type = BLOCK_TYPE_REF,
-		.u = {
-			.ref = *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 = {
-		.type = BLOCK_TYPE_LOG,
-		.u = {
-			.log = *log,
-		},
-	};
-	int err = iterator_next(it, &rec);
-	*log = rec.u.log;
-	return err;
-}
-
-int iterator_seek(struct reftable_iterator *it, struct reftable_record *want)
-{
-	return it->ops->seek(it->iter_arg, want);
-}
-
-int iterator_next(struct reftable_iterator *it, struct reftable_record *rec)
-{
-	return it->ops->next(it->iter_arg, rec);
-}
-
-static int empty_iterator_seek(void *arg, struct reftable_record *want)
-{
-	return 0;
-}
-
-static int empty_iterator_next(void *arg, struct reftable_record *rec)
-{
-	return 1;
-}
-
-static void empty_iterator_close(void *arg)
-{
-}
-
-static struct reftable_iterator_vtable empty_vtable = {
-	.seek = &empty_iterator_seek,
-	.next = &empty_iterator_next,
-	.close = &empty_iterator_close,
-};
-
-void iterator_set_empty(struct reftable_iterator *it)
-{
-	assert(!it->ops);
-	it->iter_arg = NULL;
-	it->ops = &empty_vtable;
-}

index 8341fa570e..837fbb8df2 100644
@@ -24,14 +24,4 @@ void table_init_iter(struct reftable_table *tab,
 		     struct reftable_iterator *it,
 		     uint8_t typ);
 
-struct reftable_iterator_vtable {
-	int (*seek)(void *iter_arg, struct reftable_record *want);
-	int (*next)(void *iter_arg, struct reftable_record *rec);
-	void (*close)(void *iter_arg);
-};
-
-void iterator_set_empty(struct reftable_iterator *it);
-int iterator_seek(struct reftable_iterator *it, struct reftable_record *want);
-int iterator_next(struct reftable_iterator *it, struct reftable_record *rec);
-
 #endif

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index b75d7ac2ac..3b401f1259 100644
@@ -16,6 +16,33 @@ license that can be found in the LICENSE file or at
 #include "reftable-iterator.h"
 #include "reftable-generic.h"
 
+/*
+ * The virtual function table for implementing generic reftable iterators.
+ */
+struct reftable_iterator_vtable {
+	int (*seek)(void *iter_arg, struct reftable_record *want);
+	int (*next)(void *iter_arg, struct reftable_record *rec);
+	void (*close)(void *iter_arg);
+};
+
+/*
+ * Position the iterator at the wanted record such that a call to
+ * `iterator_next()` would return that record, if it exists.
+ */
+int iterator_seek(struct reftable_iterator *it, struct reftable_record *want);
+
+/*
+ * Yield the next record and advance the iterator. Returns <0 on error, 0 when
+ * a record was yielded, and >0 when the iterator hit an error.
+ */
+int iterator_next(struct reftable_iterator *it, struct reftable_record *rec);
+
+/*
+ * Set up the iterator such that it behaves the same as an iterator with no
+ * entries.
+ */
+void iterator_set_empty(struct reftable_iterator *it);
+
 /* iterator that produces only ref records that point to `oid` */
 struct filtering_ref_iterator {
 	struct strbuf oid;

index dd65d9e8bb..2953e0a83a 100644
@@ -24,25 +24,6 @@ license that can be found in the LICENSE file or at
 #include <unistd.h>
 #include <string.h>
 
-static int compact_stack(const char *stackdir)
-{
-	struct reftable_stack *stack = NULL;
-	struct reftable_write_options opts = { 0 };
-
-	int err = reftable_new_stack(&stack, stackdir, &opts);
-	if (err < 0)
-		goto done;
-
-	err = reftable_stack_compact_all(stack, NULL);
-	if (err < 0)
-		goto done;
-done:
-	if (stack) {
-		reftable_stack_destroy(stack);
-	}
-	return err;
-}
-
 static void print_help(void)
 {
 	printf("usage: dump [-cst] arg\n\n"

@@ -62,7 +43,6 @@ int reftable_dump_main(int argc, char *const *argv)
 	int opt_dump_blocks = 0;
 	int opt_dump_table = 0;
 	int opt_dump_stack = 0;
-	int opt_compact = 0;
 	uint32_t opt_hash_id = GIT_SHA1_FORMAT_ID;
 	const char *arg = NULL, *argv0 = argv[0];
 

@@ -77,8 +57,6 @@ int reftable_dump_main(int argc, char *const *argv)
 			opt_hash_id = GIT_SHA256_FORMAT_ID;
 		else if (!strcmp("-s", argv[1]))
 			opt_dump_stack = 1;
-		else if (!strcmp("-c", argv[1]))
-			opt_compact = 1;
 		else if (!strcmp("-?", argv[1]) || !strcmp("-h", argv[1])) {
 			print_help();
 			return 2;

@@ -98,8 +76,6 @@ int reftable_dump_main(int argc, char *const *argv)
 		err = reftable_reader_print_file(arg);
 	} else if (opt_dump_stack) {
 		err = reftable_stack_print_directory(arg, opt_hash_id);
-	} else if (opt_compact) {
-		err = compact_stack(arg);
 	}
 
 	if (err < 0) {

index 2953e0a83a..35a1731da9 100644
@@ -41,9 +41,6 @@ int reftable_dump_main(int argc, char *const *argv)
 {
 	int err = 0;
 	int opt_dump_blocks = 0;
-	int opt_dump_table = 0;
-	int opt_dump_stack = 0;
-	uint32_t opt_hash_id = GIT_SHA1_FORMAT_ID;
 	const char *arg = NULL, *argv0 = argv[0];
 
 	for (; argc > 1; argv++, argc--)

@@ -51,12 +48,6 @@ int reftable_dump_main(int argc, char *const *argv)
 			break;
 		else if (!strcmp("-b", argv[1]))
 			opt_dump_blocks = 1;
-		else if (!strcmp("-t", argv[1]))
-			opt_dump_table = 1;
-		else if (!strcmp("-6", argv[1]))
-			opt_hash_id = GIT_SHA256_FORMAT_ID;
-		else if (!strcmp("-s", argv[1]))
-			opt_dump_stack = 1;
 		else if (!strcmp("-?", argv[1]) || !strcmp("-h", argv[1])) {
 			print_help();
 			return 2;

@@ -70,13 +61,8 @@ int reftable_dump_main(int argc, char *const *argv)
 
 	arg = argv[1];
 
-	if (opt_dump_blocks) {
+	if (opt_dump_blocks)
 		err = reftable_reader_print_blocks(arg);
-	} else if (opt_dump_table) {
-		err = reftable_reader_print_file(arg);
-	} else if (opt_dump_stack) {
-		err = reftable_stack_print_directory(arg, opt_hash_id);
-	}
 
 	if (err < 0) {
 		fprintf(stderr, "%s: %s: %s\n", argv0, arg,

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index e3f5854229..fbd93b88df 100644
@@ -798,27 +798,6 @@ void reftable_table_from_reader(struct reftable_table *tab,
 	tab->table_arg = reader;
 }
 
-
-int reftable_reader_print_file(const char *tablename)
-{
-	struct reftable_block_source src = { NULL };
-	int err = reftable_block_source_from_file(&src, tablename);
-	struct reftable_reader *r = NULL;
-	struct reftable_table tab = { NULL };
-	if (err < 0)
-		goto done;
-
-	err = reftable_new_reader(&r, &src, tablename);
-	if (err < 0)
-		goto done;
-
-	reftable_table_from_reader(&tab, r);
-	err = reftable_table_print(&tab);
-done:
-	reftable_reader_free(r);
-	return err;
-}
-
 int reftable_reader_print_blocks(const char *tablename)
 {
 	struct {

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index d778133e6e..5edd46ec75 100644
@@ -72,9 +72,6 @@ struct reftable_record_vtable {
 	 * the same type.
 	 */
 	int (*cmp)(const void *a, const void *b);
-
-	/* Print on stdout, for debugging. */
-	void (*print)(const void *rec, int hash_size);
 };
 
 /* returns true for recognized block types. Block start with the block type. */

@@ -136,7 +133,6 @@ void reftable_record_init(struct reftable_record *rec, uint8_t typ);
 /* see struct record_vtable */
 int reftable_record_cmp(struct reftable_record *a, struct reftable_record *b);
 int reftable_record_equal(struct reftable_record *a, struct reftable_record *b, int hash_size);
-void reftable_record_print(struct reftable_record *rec, int hash_size);
 void reftable_record_key(struct reftable_record *rec, struct strbuf *dest);
 void reftable_record_copy_from(struct reftable_record *rec,
 			       struct reftable_record *src, int hash_size);

index 65670ea093..b8b1323a33 100644
@@ -41,7 +41,4 @@ uint64_t reftable_table_min_update_index(struct reftable_table *tab);
 int reftable_table_read_ref(struct reftable_table *tab, const char *name,
 			    struct reftable_ref_record *ref);
 
-/* dump table contents onto stdout for debugging */
-int reftable_table_print(struct reftable_table *tab);
-
 #endif

index a32f31d648..7c7d171651 100644
@@ -64,8 +64,6 @@ uint64_t reftable_reader_min_update_index(struct reftable_reader *r);
 void reftable_table_from_reader(struct reftable_table *tab,
 				struct reftable_reader *reader);
 
-/* print table onto stdout for debugging. */
-int reftable_reader_print_file(const char *tablename);
 /* print blocks onto stdout for debugging. */
 int reftable_reader_print_blocks(const char *tablename);
 

index ff486eb1f7..2d42463c58 100644
@@ -60,10 +60,6 @@ const unsigned char *reftable_ref_record_val2(const struct reftable_ref_record *
 /* returns whether 'ref' represents a deletion */
 int reftable_ref_record_is_deletion(const struct reftable_ref_record *ref);
 
-/* prints a reftable_ref_record onto stdout. Useful for debugging. */
-void reftable_ref_record_print(const struct reftable_ref_record *ref,
-			       uint32_t hash_id);
-
 /* frees and nulls all pointer values inside `ref`. */
 void reftable_ref_record_release(struct reftable_ref_record *ref);
 

@@ -111,8 +107,4 @@ void reftable_log_record_release(struct reftable_log_record *log);
 int reftable_log_record_equal(const struct reftable_log_record *a,
 			      const struct reftable_log_record *b, int hash_size);
 
-/* dumps a reftable_log_record on stdout, for debugging/testing. */
-void reftable_log_record_print(struct reftable_log_record *log,
-			       uint32_t hash_id);
-
 #endif

index 09e97c9991..f4f8cabc7f 100644
@@ -140,7 +140,4 @@ struct reftable_compaction_stats {
 struct reftable_compaction_stats *
 reftable_stack_compaction_stats(struct reftable_stack *st);
 
-/* print the entire stack represented by the directory */
-int reftable_stack_print_directory(const char *stackdir, uint32_t hash_id);
-
 #endif

index d08ec00959..bedd503e7e 100644
@@ -1603,23 +1603,3 @@ int reftable_stack_clean(struct reftable_stack *st)
 	reftable_addition_destroy(add);
 	return err;
 }
-
-int reftable_stack_print_directory(const char *stackdir, uint32_t hash_id)
-{
-	struct reftable_stack *stack = NULL;
-	struct reftable_write_options opts = { .hash_id = hash_id };
-	struct reftable_merged_table *merged = NULL;
-	struct reftable_table table = { NULL };
-
-	int err = reftable_new_stack(&stack, stackdir, &opts);
-	if (err < 0)
-		goto done;
-
-	merged = reftable_stack_merged_table(stack);
-	reftable_table_from_merged_table(&table, merged);
-	err = reftable_table_print(&table);
-done:
-	if (stack)
-		reftable_stack_destroy(stack);
-	return err;
-}

index dbca9eaf4a..42044ed8a3 100644
@@ -179,13 +179,6 @@ static void test_reftable_stack_add_one(void)
 	EXPECT(0 == strcmp("master", dest.value.symref));
 	EXPECT(st->readers_len > 0);
 
-	printf("testing print functionality:\n");
-	err = reftable_stack_print_directory(dir, GIT_SHA1_FORMAT_ID);
-	EXPECT_ERR(err);
-
-	err = reftable_stack_print_directory(dir, GIT_SHA256_FORMAT_ID);
-	EXPECT(err == REFTABLE_FORMAT_ERROR);
-
 #ifndef GIT_WINDOWS_NATIVE
 	strbuf_addstr(&scratch, dir);
 	strbuf_addstr(&scratch, "/tables.list");

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deleted file mode 100644
index 837fbb8df2..0000000000
@@ -1,27 +0,0 @@
-/*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
-
-#ifndef GENERIC_H
-#define GENERIC_H
-
-#include "record.h"
-#include "reftable-generic.h"
-
-/* generic interface to reftables */
-struct reftable_table_vtable {
-	void (*init_iter)(void *tab, struct reftable_iterator *it, uint8_t typ);
-	uint32_t (*hash_id)(void *tab);
-	uint64_t (*min_update_index)(void *tab);
-	uint64_t (*max_update_index)(void *tab);
-};
-
-void table_init_iter(struct reftable_table *tab,
-		     struct reftable_iterator *it,
-		     uint8_t typ);
-
-#endif

index 844853fad2..4eb7fafd2f 100644
@@ -11,7 +11,6 @@ license that can be found in the LICENSE file or at
 #include "system.h"
 
 #include "block.h"
-#include "generic.h"
 #include "constants.h"
 #include "reader.h"
 #include "reftable-error.h"

index 3b401f1259..befc4597df 100644
@@ -14,7 +14,6 @@ license that can be found in the LICENSE file or at
 #include "record.h"
 
 #include "reftable-iterator.h"
-#include "reftable-generic.h"
 
 /*
  * The virtual function table for implementing generic reftable iterators.

index 2e72eab306..128a810c55 100644
@@ -13,7 +13,6 @@ license that can be found in the LICENSE file or at
 #include "pq.h"
 #include "reader.h"
 #include "record.h"
-#include "generic.h"
 #include "reftable-merged.h"
 #include "reftable-error.h"
 #include "system.h"

@@ -270,40 +269,3 @@ uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *mt)
 {
 	return mt->hash_id;
 }
-
-static void reftable_merged_table_init_iter_void(void *tab,
-						 struct reftable_iterator *it,
-						 uint8_t typ)
-{
-	merged_table_init_iter(tab, it, typ);
-}
-
-static uint32_t reftable_merged_table_hash_id_void(void *tab)
-{
-	return reftable_merged_table_hash_id(tab);
-}
-
-static uint64_t reftable_merged_table_min_update_index_void(void *tab)
-{
-	return reftable_merged_table_min_update_index(tab);
-}
-
-static uint64_t reftable_merged_table_max_update_index_void(void *tab)
-{
-	return reftable_merged_table_max_update_index(tab);
-}
-
-static struct reftable_table_vtable merged_table_vtable = {
-	.init_iter = reftable_merged_table_init_iter_void,
-	.hash_id = reftable_merged_table_hash_id_void,
-	.min_update_index = reftable_merged_table_min_update_index_void,
-	.max_update_index = reftable_merged_table_max_update_index_void,
-};
-
-void reftable_table_from_merged_table(struct reftable_table *tab,
-				      struct reftable_merged_table *merged)
-{
-	assert(!tab->ops);
-	tab->ops = &merged_table_vtable;
-	tab->table_arg = merged;
-}

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index 03c2619c0f..16d19f8df2 100644
@@ -26,8 +26,6 @@ license that can be found in the LICENSE file or at
 /* A merged table is implements seeking/iterating over a stack of tables. */
 struct reftable_merged_table;
 
-/* A generic reftable; see below. */
-struct reftable_table;
 struct reftable_reader;
 
 /*

@@ -60,8 +58,4 @@ void reftable_merged_table_free(struct reftable_merged_table *m);
 /* return the hash ID of the merged table. */
 uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *m);
 
-/* create a generic table from reftable_merged_table */
-void reftable_table_from_merged_table(struct reftable_table *tab,
-				      struct reftable_merged_table *table);
-
 #endif

index 7c7d171651..69621c5b0f 100644
@@ -23,9 +23,6 @@
 /* The reader struct is a handle to an open reftable file. */
 struct reftable_reader;
 
-/* Generic table. */
-struct reftable_table;
-
 /* reftable_new_reader opens a reftable for reading. If successful,
  * returns 0 code and sets pp. The name is used for creating a
  * stack. Typically, it is the basename of the file. The block source

@@ -60,10 +57,6 @@ uint64_t reftable_reader_max_update_index(struct reftable_reader *r);
 /* return the min_update_index for a table */
 uint64_t reftable_reader_min_update_index(struct reftable_reader *r);
 
-/* creates a generic table from a file reader. */
-void reftable_table_from_reader(struct reftable_table *tab,
-				struct reftable_reader *reader);
-
 /* print blocks onto stdout for debugging. */
 int reftable_reader_print_blocks(const char *tablename);
 

index bedd503e7e..d3a95d2f1d 100644
@@ -14,7 +14,6 @@ license that can be found in the LICENSE file or at
 #include "merged.h"
 #include "reader.h"
 #include "reftable-error.h"
-#include "reftable-generic.h"
 #include "reftable-record.h"
 #include "reftable-merged.h"
 #include "writer.h"

index 577b1a5be8..93345c6c8b 100644
@@ -12,7 +12,6 @@ license that can be found in the LICENSE file or at
 #include "reftable/merged.h"
 #include "reftable/reader.h"
 #include "reftable/reftable-error.h"
-#include "reftable/reftable-generic.h"
 #include "reftable/reftable-merged.h"
 #include "reftable/reftable-writer.h"