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Wed, 12 Mar 2025 11:56:22 -0400 (EDT) Received: by vm-mail (OpenSMTPD) with ESMTPSA id 6dbb1931 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Wed, 12 Mar 2025 15:56:20 +0000 (UTC) From: Patrick Steinhardt Date: Wed, 12 Mar 2025 16:56:17 +0100 Subject: [PATCH v6 11/16] refs/iterator: implement seeking for merged iterators Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250312-pks-update-ref-optimization-v6-11-f778e0414f55@pks.im> References: <20250312-pks-update-ref-optimization-v6-0-f778e0414f55@pks.im> In-Reply-To: <20250312-pks-update-ref-optimization-v6-0-f778e0414f55@pks.im> To: git@vger.kernel.org Cc: Karthik Nayak , "brian m. carlson" , Jeff King , Junio C Hamano , shejialuo , Christian Couder X-Mailer: b4 0.14.2 Implement seeking on merged iterators. The implementation is rather straight forward, with the only exception that we must not deallocate the underlying iterators once they have been exhausted. Signed-off-by: Patrick Steinhardt --- refs/iterator.c | 38 +++++++++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 9 deletions(-) diff --git a/refs/iterator.c b/refs/iterator.c index ea4db59481d..766d96e795c 100644 --- a/refs/iterator.c +++ b/refs/iterator.c @@ -96,7 +96,8 @@ int is_empty_ref_iterator(struct ref_iterator *ref_iterator) struct merge_ref_iterator { struct ref_iterator base; - struct ref_iterator *iter0, *iter1; + struct ref_iterator *iter0, *iter0_owned; + struct ref_iterator *iter1, *iter1_owned; ref_iterator_select_fn *select; void *cb_data; @@ -160,13 +161,11 @@ static int merge_ref_iterator_advance(struct ref_iterator *ref_iterator) if (!iter->current) { /* Initialize: advance both iterators to their first entries */ if ((ok = ref_iterator_advance(iter->iter0)) != ITER_OK) { - ref_iterator_free(iter->iter0); iter->iter0 = NULL; if (ok == ITER_ERROR) goto error; } if ((ok = ref_iterator_advance(iter->iter1)) != ITER_OK) { - ref_iterator_free(iter->iter1); iter->iter1 = NULL; if (ok == ITER_ERROR) goto error; @@ -177,7 +176,6 @@ static int merge_ref_iterator_advance(struct ref_iterator *ref_iterator) * entry: */ if ((ok = ref_iterator_advance(*iter->current)) != ITER_OK) { - ref_iterator_free(*iter->current); *iter->current = NULL; if (ok == ITER_ERROR) goto error; @@ -206,7 +204,6 @@ static int merge_ref_iterator_advance(struct ref_iterator *ref_iterator) if (selection & ITER_SKIP_SECONDARY) { if ((ok = ref_iterator_advance(*secondary)) != ITER_OK) { - ref_iterator_free(*secondary); *secondary = NULL; if (ok == ITER_ERROR) goto error; @@ -226,6 +223,28 @@ static int merge_ref_iterator_advance(struct ref_iterator *ref_iterator) return ITER_ERROR; } +static int merge_ref_iterator_seek(struct ref_iterator *ref_iterator, + const char *prefix) +{ + struct merge_ref_iterator *iter = + (struct merge_ref_iterator *)ref_iterator; + int ret; + + iter->current = NULL; + iter->iter0 = iter->iter0_owned; + iter->iter1 = iter->iter1_owned; + + ret = ref_iterator_seek(iter->iter0, prefix); + if (ret < 0) + return ret; + + ret = ref_iterator_seek(iter->iter1, prefix); + if (ret < 0) + return ret; + + return 0; +} + static int merge_ref_iterator_peel(struct ref_iterator *ref_iterator, struct object_id *peeled) { @@ -242,12 +261,13 @@ static void merge_ref_iterator_release(struct ref_iterator *ref_iterator) { struct merge_ref_iterator *iter = (struct merge_ref_iterator *)ref_iterator; - ref_iterator_free(iter->iter0); - ref_iterator_free(iter->iter1); + ref_iterator_free(iter->iter0_owned); + ref_iterator_free(iter->iter1_owned); } static struct ref_iterator_vtable merge_ref_iterator_vtable = { .advance = merge_ref_iterator_advance, + .seek = merge_ref_iterator_seek, .peel = merge_ref_iterator_peel, .release = merge_ref_iterator_release, }; @@ -268,8 +288,8 @@ struct ref_iterator *merge_ref_iterator_begin( */ base_ref_iterator_init(ref_iterator, &merge_ref_iterator_vtable); - iter->iter0 = iter0; - iter->iter1 = iter1; + iter->iter0 = iter->iter0_owned = iter0; + iter->iter1 = iter->iter1_owned = iter1; iter->select = select; iter->cb_data = cb_data; iter->current = NULL;