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1 : : // Copyright (c) The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #include <txgraph.h>
6 : :
7 : : #include <cluster_linearize.h>
8 : : #include <random.h>
9 : : #include <util/bitset.h>
10 : : #include <util/check.h>
11 : : #include <util/feefrac.h>
12 : :
13 : : #include <compare>
14 : : #include <memory>
15 : : #include <set>
16 : : #include <span>
17 : : #include <utility>
18 : :
19 : : namespace {
20 : :
21 : : using namespace cluster_linearize;
22 : :
23 : : /** The maximum number of levels a TxGraph can have (0 = main, 1 = staging). */
24 : : static constexpr int MAX_LEVELS{2};
25 : :
26 : : // Forward declare the TxGraph implementation class.
27 : : class TxGraphImpl;
28 : :
29 : : /** Position of a DepGraphIndex within a Cluster::m_linearization. */
30 : : using LinearizationIndex = uint32_t;
31 : : /** Position of a Cluster within Graph::ClusterSet::m_clusters. */
32 : : using ClusterSetIndex = uint32_t;
33 : :
34 : : /** Quality levels for cached cluster linearizations. */
35 : : enum class QualityLevel
36 : : {
37 : : /** This cluster may have multiple disconnected components, which are all NEEDS_RELINEARIZE. */
38 : : NEEDS_SPLIT,
39 : : /** This cluster may have multiple disconnected components, which are all ACCEPTABLE. */
40 : : NEEDS_SPLIT_ACCEPTABLE,
41 : : /** This cluster has undergone changes that warrant re-linearization. */
42 : : NEEDS_RELINEARIZE,
43 : : /** The minimal level of linearization has been performed, but it is not known to be optimal. */
44 : : ACCEPTABLE,
45 : : /** The linearization is known to be optimal. */
46 : : OPTIMAL,
47 : : /** This cluster is not registered in any ClusterSet::m_clusters.
48 : : * This must be the last entry in QualityLevel as ClusterSet::m_clusters is sized using it. */
49 : : NONE,
50 : : };
51 : :
52 : : /** A grouping of connected transactions inside a TxGraphImpl::ClusterSet. */
53 : : class Cluster
54 : : {
55 : : friend class TxGraphImpl;
56 : : using GraphIndex = TxGraph::GraphIndex;
57 : : using SetType = BitSet<MAX_CLUSTER_COUNT_LIMIT>;
58 : : /** The DepGraph for this cluster, holding all feerates, and ancestors/descendants. */
59 : : DepGraph<SetType> m_depgraph;
60 : : /** m_mapping[i] gives the GraphIndex for the position i transaction in m_depgraph. Values for
61 : : * positions i that do not exist in m_depgraph shouldn't ever be accessed and thus don't
62 : : * matter. m_mapping.size() equals m_depgraph.PositionRange(). */
63 : : std::vector<GraphIndex> m_mapping;
64 : : /** The current linearization of the cluster. m_linearization.size() equals
65 : : * m_depgraph.TxCount(). This is always kept topological. */
66 : : std::vector<DepGraphIndex> m_linearization;
67 : : /** The quality level of m_linearization. */
68 : : QualityLevel m_quality{QualityLevel::NONE};
69 : : /** Which position this Cluster has in Graph::ClusterSet::m_clusters[m_quality]. */
70 : : ClusterSetIndex m_setindex{ClusterSetIndex(-1)};
71 : : /** Which level this Cluster is at in the graph (-1=not inserted, 0=main, 1=staging). */
72 : : int m_level{-1};
73 : :
74 : : public:
75 : : /** Construct an empty Cluster. */
76 : 0 : Cluster() noexcept = default;
77 : : /** Construct a singleton Cluster. */
78 : : explicit Cluster(TxGraphImpl& graph, const FeePerWeight& feerate, GraphIndex graph_index) noexcept;
79 : :
80 : : // Cannot move or copy (would invalidate Cluster* in Locator and ClusterSet). */
81 : : Cluster(const Cluster&) = delete;
82 : : Cluster& operator=(const Cluster&) = delete;
83 : : Cluster(Cluster&&) = delete;
84 : : Cluster& operator=(Cluster&&) = delete;
85 : :
86 : : // Generic helper functions.
87 : :
88 : : /** Whether the linearization of this Cluster can be exposed. */
89 : 0 : bool IsAcceptable(bool after_split = false) const noexcept
90 : : {
91 [ # # # # : 0 : return m_quality == QualityLevel::ACCEPTABLE || m_quality == QualityLevel::OPTIMAL ||
# # ]
92 [ # # # # ]: 0 : (after_split && m_quality == QualityLevel::NEEDS_SPLIT_ACCEPTABLE);
93 : : }
94 : : /** Whether the linearization of this Cluster is optimal. */
95 : 0 : bool IsOptimal() const noexcept
96 : : {
97 : 0 : return m_quality == QualityLevel::OPTIMAL;
98 : : }
99 : : /** Whether this cluster requires splitting. */
100 : 0 : bool NeedsSplitting() const noexcept
101 : : {
102 : 0 : return m_quality == QualityLevel::NEEDS_SPLIT ||
103 : 0 : m_quality == QualityLevel::NEEDS_SPLIT_ACCEPTABLE;
104 : : }
105 : : /** Get the number of transactions in this Cluster. */
106 [ # # ]: 0 : LinearizationIndex GetTxCount() const noexcept { return m_linearization.size(); }
107 : : /** Given a DepGraphIndex into this Cluster, find the corresponding GraphIndex. */
108 : 0 : GraphIndex GetClusterEntry(DepGraphIndex index) const noexcept { return m_mapping[index]; }
109 : : /** Only called by Graph::SwapIndexes. */
110 : 0 : void UpdateMapping(DepGraphIndex cluster_idx, GraphIndex graph_idx) noexcept { m_mapping[cluster_idx] = graph_idx; }
111 : : /** Push changes to Cluster and its linearization to the TxGraphImpl Entry objects. */
112 : : void Updated(TxGraphImpl& graph) noexcept;
113 : : /** Create a copy of this Cluster in staging, returning a pointer to it (used by PullIn). */
114 : : Cluster* CopyToStaging(TxGraphImpl& graph) const noexcept;
115 : : /** Get the list of Clusters in main that conflict with this one (which is assumed to be in staging). */
116 : : void GetConflicts(const TxGraphImpl& graph, std::vector<Cluster*>& out) const noexcept;
117 : : /** Mark all the Entry objects belonging to this staging Cluster as missing. The Cluster must be
118 : : * deleted immediately after. */
119 : : void MakeStagingTransactionsMissing(TxGraphImpl& graph) noexcept;
120 : : /** Remove all transactions from a Cluster. */
121 : : void Clear(TxGraphImpl& graph) noexcept;
122 : : /** Change a Cluster's level from 1 (staging) to 0 (main). */
123 : : void MoveToMain(TxGraphImpl& graph) noexcept;
124 : :
125 : : // Functions that implement the Cluster-specific side of internal TxGraphImpl mutations.
126 : :
127 : : /** Apply all removals from the front of to_remove that apply to this Cluster, popping them
128 : : * off. These must be at least one such entry. */
129 : : void ApplyRemovals(TxGraphImpl& graph, std::span<GraphIndex>& to_remove) noexcept;
130 : : /** Split this cluster (must have a NEEDS_SPLIT* quality). Returns whether to delete this
131 : : * Cluster afterwards. */
132 : : [[nodiscard]] bool Split(TxGraphImpl& graph) noexcept;
133 : : /** Move all transactions from cluster to *this (as separate components). */
134 : : void Merge(TxGraphImpl& graph, Cluster& cluster) noexcept;
135 : : /** Given a span of (parent, child) pairs that all belong to this Cluster, apply them. */
136 : : void ApplyDependencies(TxGraphImpl& graph, std::span<std::pair<GraphIndex, GraphIndex>> to_apply) noexcept;
137 : : /** Improve the linearization of this Cluster. */
138 : : void Relinearize(TxGraphImpl& graph, uint64_t max_iters) noexcept;
139 : :
140 : : // Functions that implement the Cluster-specific side of public TxGraph functions.
141 : :
142 : : /** Process elements from the front of args that apply to this cluster, and append Refs for the
143 : : * union of their ancestors to output. */
144 : : void GetAncestorRefs(const TxGraphImpl& graph, std::span<std::pair<Cluster*, DepGraphIndex>>& args, std::vector<TxGraph::Ref*>& output) noexcept;
145 : : /** Process elements from the front of args that apply to this cluster, and append Refs for the
146 : : * union of their descendants to output. */
147 : : void GetDescendantRefs(const TxGraphImpl& graph, std::span<std::pair<Cluster*, DepGraphIndex>>& args, std::vector<TxGraph::Ref*>& output) noexcept;
148 : : /** Get a vector of Refs for all elements of this Cluster, in linearization order. */
149 : : std::vector<TxGraph::Ref*> GetClusterRefs(const TxGraphImpl& graph) noexcept;
150 : : /** Get the individual transaction feerate of a Cluster element. */
151 : : FeePerWeight GetIndividualFeerate(DepGraphIndex idx) noexcept;
152 : : /** Modify the fee of a Cluster element. */
153 : : void SetFee(TxGraphImpl& graph, DepGraphIndex idx, int64_t fee) noexcept;
154 : :
155 : : // Debugging functions.
156 : :
157 : : void SanityCheck(const TxGraphImpl& graph, int level) const;
158 : : };
159 : :
160 : : /** The transaction graph, including staged changes.
161 : : *
162 : : * The overall design of the data structure consists of 3 interlinked representations:
163 : : * - The transactions (held as a vector of TxGraphImpl::Entry inside TxGraphImpl).
164 : : * - The clusters (Cluster objects in per-quality vectors inside TxGraphImpl::ClusterSet).
165 : : * - The Refs (TxGraph::Ref objects, held externally by users of the TxGraph class)
166 : : *
167 : : * The Clusters are kept in one or two ClusterSet objects, one for the "main" graph, and one for
168 : : * the proposed changes ("staging"). If a transaction occurs in both, they share the same Entry,
169 : : * but there will be a separate Cluster per graph.
170 : : *
171 : : * Clusters and Refs contain the index of the Entry objects they refer to, and the Entry objects
172 : : * refer back to the Clusters and Refs the corresponding transaction is contained in.
173 : : *
174 : : * While redundant, this permits moving all of them independently, without invalidating things
175 : : * or costly iteration to fix up everything:
176 : : * - Entry objects can be moved to fill holes left by removed transactions in the Entry vector
177 : : * (see TxGraphImpl::Compact).
178 : : * - Clusters can be rewritten continuously (removals can cause them to split, new dependencies
179 : : * can cause them to be merged).
180 : : * - Ref objects can be held outside the class, while permitting them to be moved around, and
181 : : * inherited from.
182 : : */
183 : : class TxGraphImpl final : public TxGraph
184 : : {
185 : : friend class Cluster;
186 : : private:
187 : : /** Internal RNG. */
188 : : FastRandomContext m_rng;
189 : : /** This TxGraphImpl's maximum cluster count limit. */
190 : : const DepGraphIndex m_max_cluster_count;
191 : :
192 : : /** Information about one group of Clusters to be merged. */
193 : : struct GroupEntry
194 : : {
195 : : /** Where the clusters to be merged start in m_group_clusters. */
196 : : uint32_t m_cluster_offset;
197 : : /** How many clusters to merge. */
198 : : uint32_t m_cluster_count;
199 : : /** Where the dependencies for this cluster group in m_deps_to_add start. */
200 : : uint32_t m_deps_offset;
201 : : /** How many dependencies to add. */
202 : : uint32_t m_deps_count;
203 : : };
204 : :
205 : : /** Information about all groups of Clusters to be merged. */
206 : 0 : struct GroupData
207 : : {
208 : : /** The groups of Clusters to be merged. */
209 : : std::vector<GroupEntry> m_groups;
210 : : /** Which clusters are to be merged. GroupEntry::m_cluster_offset indexes into this. */
211 : : std::vector<Cluster*> m_group_clusters;
212 : : /** Whether at least one of the groups cannot be applied because it would result in a
213 : : * Cluster that violates the cluster count limit. */
214 : : bool m_group_oversized;
215 : : };
216 : :
217 : : /** The collection of all Clusters in main or staged. */
218 : : struct ClusterSet
219 : : {
220 : : /** The vectors of clusters, one vector per quality level. ClusterSetIndex indexes into each. */
221 : : std::array<std::vector<std::unique_ptr<Cluster>>, int(QualityLevel::NONE)> m_clusters;
222 : : /** Which removals have yet to be applied. */
223 : : std::vector<GraphIndex> m_to_remove;
224 : : /** Which dependencies are to be added ((parent,child) pairs). GroupData::m_deps_offset indexes
225 : : * into this. */
226 : : std::vector<std::pair<GraphIndex, GraphIndex>> m_deps_to_add;
227 : : /** Information about the merges to be performed, if known. */
228 : : std::optional<GroupData> m_group_data = GroupData{};
229 : : /** Which entries were removed in this ClusterSet (so they can be wiped on abort). This
230 : : * includes all entries which have an (R) removed locator at this level (staging only),
231 : : * plus optionally any transaction in m_unlinked. */
232 : : std::vector<GraphIndex> m_removed;
233 : : /** Total number of transactions in this graph (sum of all transaction counts in all
234 : : * Clusters, and for staging also those inherited from the main ClusterSet). */
235 : : GraphIndex m_txcount{0};
236 : : /** Whether this graph is oversized (if known). This roughly matches
237 : : * m_group_data->m_group_oversized, but may be known even if m_group_data is not. */
238 : : std::optional<bool> m_oversized{false};
239 : :
240 : 0 : ClusterSet() noexcept = default;
241 : : };
242 : :
243 : : /** The main ClusterSet. */
244 : : ClusterSet m_main_clusterset;
245 : : /** The staging ClusterSet, if any. */
246 : : std::optional<ClusterSet> m_staging_clusterset;
247 : :
248 : : /** A Locator that describes whether, where, and in which Cluster an Entry appears.
249 : : * Every Entry has MAX_LEVELS locators, as it may appear in one Cluster per level.
250 : : *
251 : : * Each level of a Locator is in one of three states:
252 : : *
253 : : * - (P)resent: actually occurs in a Cluster at that level.
254 : : *
255 : : * - (M)issing:
256 : : * - In the main graph: the transaction does not exist in main.
257 : : * - In the staging graph: the transaction's existence is the same as in main. If it doesn't
258 : : * exist in main, (M) in staging means it does not exist there
259 : : * either. If it does exist in main, (M) in staging means the
260 : : * cluster it is in has not been modified in staging, and thus the
261 : : * transaction implicitly exists in staging too (without explicit
262 : : * Cluster object; see PullIn() to create it in staging too).
263 : : *
264 : : * - (R)emoved: only possible in staging; it means the transaction exists in main, but is
265 : : * removed in staging.
266 : : *
267 : : * The following combinations are possible:
268 : : * - (M,M): the transaction doesn't exist in either graph.
269 : : * - (P,M): the transaction exists in both, but only exists explicitly in a Cluster object in
270 : : * main. Its existence in staging is inherited from main.
271 : : * - (P,P): the transaction exists in both, and is materialized in both. Thus, the clusters
272 : : * and/or their linearizations may be different in main and staging.
273 : : * - (M,P): the transaction is added in staging, and does not exist in main.
274 : : * - (P,R): the transaction exists in main, but is removed in staging.
275 : : *
276 : : * When staging does not exist, only (M,M) and (P,M) are possible.
277 : : */
278 : : struct Locator
279 : : {
280 : : /** Which Cluster the Entry appears in (nullptr = missing). */
281 : : Cluster* cluster{nullptr};
282 : : /** Where in the Cluster it appears (if cluster == nullptr: 0 = missing, -1 = removed). */
283 : : DepGraphIndex index{0};
284 : :
285 : : /** Mark this Locator as missing (= same as lower level, or non-existing if level 0). */
286 : 0 : void SetMissing() noexcept { cluster = nullptr; index = 0; }
287 : : /** Mark this Locator as removed (not allowed in level 0). */
288 : 0 : void SetRemoved() noexcept { cluster = nullptr; index = DepGraphIndex(-1); }
289 : : /** Mark this Locator as present, in the specified Cluster. */
290 : 0 : void SetPresent(Cluster* c, DepGraphIndex i) noexcept { cluster = c; index = i; }
291 : : /** Check if this Locator is missing. */
292 [ # # # # ]: 0 : bool IsMissing() const noexcept { return cluster == nullptr && index == 0; }
293 : : /** Check if this Locator is removed. */
294 [ # # # # : 0 : bool IsRemoved() const noexcept { return cluster == nullptr && index == DepGraphIndex(-1); }
# # ]
295 : : /** Check if this Locator is present (in some Cluster). */
296 [ # # ]: 0 : bool IsPresent() const noexcept { return cluster != nullptr; }
297 : : };
298 : :
299 : : /** Internal information about each transaction in a TxGraphImpl. */
300 : 0 : struct Entry
301 : : {
302 : : /** Pointer to the corresponding Ref object if any, or nullptr if unlinked. */
303 : : Ref* m_ref{nullptr};
304 : : /** Which Cluster and position therein this Entry appears in. ([0] = main, [1] = staged). */
305 : : Locator m_locator[MAX_LEVELS];
306 : : /** The chunk feerate of this transaction in main (if present in m_locator[0]). */
307 : : FeePerWeight m_main_chunk_feerate;
308 : : /** The position this transaction has in the main linearization (if present). */
309 : : LinearizationIndex m_main_lin_index;
310 : : };
311 : :
312 : : /** The set of all transactions (in all levels combined). GraphIndex values index into this. */
313 : : std::vector<Entry> m_entries;
314 : :
315 : : /** Set of Entries which have no linked Ref anymore. */
316 : : std::vector<GraphIndex> m_unlinked;
317 : :
318 : : public:
319 : : /** Construct a new TxGraphImpl with the specified maximum cluster count. */
320 : 0 : explicit TxGraphImpl(DepGraphIndex max_cluster_count) noexcept :
321 : 0 : m_max_cluster_count(max_cluster_count)
322 : : {
323 : 0 : Assume(max_cluster_count >= 1);
324 : 0 : Assume(max_cluster_count <= MAX_CLUSTER_COUNT_LIMIT);
325 : 0 : }
326 : :
327 : : /** Destructor. */
328 : : ~TxGraphImpl() noexcept;
329 : :
330 : : // Cannot move or copy (would invalidate TxGraphImpl* in Ref, MiningOrder, EvictionOrder).
331 : : TxGraphImpl(const TxGraphImpl&) = delete;
332 : : TxGraphImpl& operator=(const TxGraphImpl&) = delete;
333 : : TxGraphImpl(TxGraphImpl&&) = delete;
334 : : TxGraphImpl& operator=(TxGraphImpl&&) = delete;
335 : :
336 : : // Simple helper functions.
337 : :
338 : : /** Swap the Entry referred to by a and the one referred to by b. */
339 : : void SwapIndexes(GraphIndex a, GraphIndex b) noexcept;
340 : : /** If idx exists in the specified level ClusterSet (explicitly, or in the level below and not
341 : : * removed), return the Cluster it is in. Otherwise, return nullptr. */
342 : : Cluster* FindCluster(GraphIndex idx, int level) const noexcept;
343 : : /** Extract a Cluster from its ClusterSet. */
344 : : std::unique_ptr<Cluster> ExtractCluster(int level, QualityLevel quality, ClusterSetIndex setindex) noexcept;
345 : : /** Delete a Cluster. */
346 : : void DeleteCluster(Cluster& cluster) noexcept;
347 : : /** Insert a Cluster into its ClusterSet. */
348 : : ClusterSetIndex InsertCluster(int level, std::unique_ptr<Cluster>&& cluster, QualityLevel quality) noexcept;
349 : : /** Change the QualityLevel of a Cluster (identified by old_quality and old_index). */
350 : : void SetClusterQuality(int level, QualityLevel old_quality, ClusterSetIndex old_index, QualityLevel new_quality) noexcept;
351 : : /** Get the index of the top level ClusterSet (staging if it exists, main otherwise). */
352 [ # # # # : 0 : int GetTopLevel() const noexcept { return m_staging_clusterset.has_value(); }
# # # # ]
353 : : /** Get the specified level (staging if it exists and main_only is not specified, main otherwise). */
354 [ # # # # : 0 : int GetSpecifiedLevel(bool main_only) const noexcept { return m_staging_clusterset.has_value() && !main_only; }
# # # # #
# # # # #
# # # # ]
355 : : /** Get a reference to the ClusterSet at the specified level (which must exist). */
356 : : ClusterSet& GetClusterSet(int level) noexcept;
357 : : const ClusterSet& GetClusterSet(int level) const noexcept;
358 : : /** Make a transaction not exist at a specified level. It must currently exist there. */
359 : : void ClearLocator(int level, GraphIndex index) noexcept;
360 : : /** Find which Clusters in main conflict with ones in staging. */
361 : : std::vector<Cluster*> GetConflicts() const noexcept;
362 : :
363 : : // Functions for handling Refs.
364 : :
365 : : /** Only called by Ref's move constructor/assignment to update Ref locations. */
366 : 0 : void UpdateRef(GraphIndex idx, Ref& new_location) noexcept final
367 : : {
368 : 0 : auto& entry = m_entries[idx];
369 : 0 : Assume(entry.m_ref != nullptr);
370 : 0 : entry.m_ref = &new_location;
371 : 0 : }
372 : :
373 : : /** Only called by Ref::~Ref to unlink Refs, and Ref's move assignment. */
374 : 0 : void UnlinkRef(GraphIndex idx) noexcept final
375 : : {
376 : 0 : auto& entry = m_entries[idx];
377 : 0 : Assume(entry.m_ref != nullptr);
378 : 0 : entry.m_ref = nullptr;
379 : : // Mark the transaction as to be removed in all levels where it explicitly or implicitly
380 : : // exists.
381 : 0 : bool exists_anywhere{false};
382 : 0 : bool exists{false};
383 [ # # ]: 0 : for (int level = 0; level <= GetTopLevel(); ++level) {
384 [ # # ]: 0 : if (entry.m_locator[level].IsPresent()) {
385 : : exists_anywhere = true;
386 : : exists = true;
387 [ # # ]: 0 : } else if (entry.m_locator[level].IsRemoved()) {
388 : : exists = false;
389 : : }
390 [ # # ]: 0 : if (exists) {
391 : 0 : auto& clusterset = GetClusterSet(level);
392 : 0 : clusterset.m_to_remove.push_back(idx);
393 : : // Force recomputation of grouping data.
394 [ # # ]: 0 : clusterset.m_group_data = std::nullopt;
395 : : // Do not wipe the oversized state of main if staging exists. The reason for this
396 : : // is that the alternative would mean that cluster merges may need to be applied to
397 : : // a formerly-oversized main graph while staging exists (to satisfy chunk feerate
398 : : // queries into main, for example), and such merges could conflict with pulls of
399 : : // some of their constituents into staging.
400 [ # # # # ]: 0 : if (level == GetTopLevel() && clusterset.m_oversized == true) {
401 : 0 : clusterset.m_oversized = std::nullopt;
402 : : }
403 : : }
404 : : }
405 : 0 : m_unlinked.push_back(idx);
406 [ # # ]: 0 : if (!exists_anywhere) Compact();
407 : 0 : }
408 : :
409 : : // Functions related to various normalization/application steps.
410 : : /** Get rid of unlinked Entry objects in m_entries, if possible (this changes the GraphIndex
411 : : * values for remaining Entry objects, so this only does something when no to-be-applied
412 : : * operations or staged removals referring to GraphIndexes remain). */
413 : : void Compact() noexcept;
414 : : /** If cluster is not in staging, copy it there, and return a pointer to it.
415 : : * Staging must exist, and this modifies the locators of its
416 : : * transactions from inherited (P,M) to explicit (P,P). */
417 : : Cluster* PullIn(Cluster* cluster) noexcept;
418 : : /** Apply all removals queued up in m_to_remove to the relevant Clusters (which get a
419 : : * NEEDS_SPLIT* QualityLevel) up to the specified level. */
420 : : void ApplyRemovals(int up_to_level) noexcept;
421 : : /** Split an individual cluster. */
422 : : void Split(Cluster& cluster) noexcept;
423 : : /** Split all clusters that need splitting up to the specified level. */
424 : : void SplitAll(int up_to_level) noexcept;
425 : : /** Populate m_group_data based on m_deps_to_add in the specified level. */
426 : : void GroupClusters(int level) noexcept;
427 : : /** Merge the specified clusters. */
428 : : void Merge(std::span<Cluster*> to_merge) noexcept;
429 : : /** Apply all m_deps_to_add to the relevant Clusters in the specified level. */
430 : : void ApplyDependencies(int level) noexcept;
431 : : /** Make a specified Cluster have quality ACCEPTABLE or OPTIMAL. */
432 : : void MakeAcceptable(Cluster& cluster) noexcept;
433 : : /** Make all Clusters at the specified level have quality ACCEPTABLE or OPTIMAL. */
434 : : void MakeAllAcceptable(int level) noexcept;
435 : :
436 : : // Implementations for the public TxGraph interface.
437 : :
438 : : Ref AddTransaction(const FeePerWeight& feerate) noexcept final;
439 : : void RemoveTransaction(const Ref& arg) noexcept final;
440 : : void AddDependency(const Ref& parent, const Ref& child) noexcept final;
441 : : void SetTransactionFee(const Ref&, int64_t fee) noexcept final;
442 : :
443 : : void DoWork() noexcept final;
444 : :
445 : : void StartStaging() noexcept final;
446 : : void CommitStaging() noexcept final;
447 : : void AbortStaging() noexcept final;
448 : 0 : bool HaveStaging() const noexcept final { return m_staging_clusterset.has_value(); }
449 : :
450 : : bool Exists(const Ref& arg, bool main_only = false) noexcept final;
451 : : FeePerWeight GetMainChunkFeerate(const Ref& arg) noexcept final;
452 : : FeePerWeight GetIndividualFeerate(const Ref& arg) noexcept final;
453 : : std::vector<Ref*> GetCluster(const Ref& arg, bool main_only = false) noexcept final;
454 : : std::vector<Ref*> GetAncestors(const Ref& arg, bool main_only = false) noexcept final;
455 : : std::vector<Ref*> GetDescendants(const Ref& arg, bool main_only = false) noexcept final;
456 : : std::vector<Ref*> GetAncestorsUnion(std::span<const Ref* const> args, bool main_only = false) noexcept final;
457 : : std::vector<Ref*> GetDescendantsUnion(std::span<const Ref* const> args, bool main_only = false) noexcept final;
458 : : GraphIndex GetTransactionCount(bool main_only = false) noexcept final;
459 : : bool IsOversized(bool main_only = false) noexcept final;
460 : : std::strong_ordering CompareMainOrder(const Ref& a, const Ref& b) noexcept final;
461 : : GraphIndex CountDistinctClusters(std::span<const Ref* const> refs, bool main_only = false) noexcept final;
462 : :
463 : : void SanityCheck() const final;
464 : : };
465 : :
466 : 0 : TxGraphImpl::ClusterSet& TxGraphImpl::GetClusterSet(int level) noexcept
467 : : {
468 [ # # ]: 0 : if (level == 0) return m_main_clusterset;
469 : 0 : Assume(level == 1);
470 : 0 : Assume(m_staging_clusterset.has_value());
471 : 0 : return *m_staging_clusterset;
472 : : }
473 : :
474 : 0 : const TxGraphImpl::ClusterSet& TxGraphImpl::GetClusterSet(int level) const noexcept
475 : : {
476 [ # # ]: 0 : if (level == 0) return m_main_clusterset;
477 : 0 : Assume(level == 1);
478 : 0 : Assume(m_staging_clusterset.has_value());
479 : 0 : return *m_staging_clusterset;
480 : : }
481 : :
482 : 0 : void TxGraphImpl::ClearLocator(int level, GraphIndex idx) noexcept
483 : : {
484 : 0 : auto& entry = m_entries[idx];
485 : 0 : auto& clusterset = GetClusterSet(level);
486 : 0 : Assume(entry.m_locator[level].IsPresent());
487 : : // Change the locator from Present to Missing or Removed.
488 [ # # # # ]: 0 : if (level == 0 || !entry.m_locator[level - 1].IsPresent()) {
489 : 0 : entry.m_locator[level].SetMissing();
490 : : } else {
491 : 0 : entry.m_locator[level].SetRemoved();
492 : 0 : clusterset.m_removed.push_back(idx);
493 : : }
494 : : // Update the transaction count.
495 : 0 : --clusterset.m_txcount;
496 : : // If clearing main, adjust the status of Locators of this transaction in staging, if it exists.
497 [ # # # # ]: 0 : if (level == 0 && GetTopLevel() == 1) {
498 [ # # ]: 0 : if (entry.m_locator[1].IsRemoved()) {
499 : 0 : entry.m_locator[1].SetMissing();
500 [ # # ]: 0 : } else if (!entry.m_locator[1].IsPresent()) {
501 : 0 : --m_staging_clusterset->m_txcount;
502 : : }
503 : : }
504 : 0 : }
505 : :
506 : 0 : void Cluster::Updated(TxGraphImpl& graph) noexcept
507 : : {
508 : : // Update all the Locators for this Cluster's Entry objects.
509 [ # # ]: 0 : for (DepGraphIndex idx : m_linearization) {
510 : 0 : auto& entry = graph.m_entries[m_mapping[idx]];
511 : 0 : entry.m_locator[m_level].SetPresent(this, idx);
512 : : }
513 : : // If this is for the main graph (level = 0), and the Cluster's quality is ACCEPTABLE or
514 : : // OPTIMAL, compute its chunking and store its information in the Entry's m_main_lin_index
515 : : // and m_main_chunk_feerate. These fields are only accessed after making the entire graph
516 : : // ACCEPTABLE, so it is pointless to compute these if we haven't reached that quality level
517 : : // yet.
518 [ # # ]: 0 : if (m_level == 0 && IsAcceptable()) {
519 : 0 : LinearizationChunking chunking(m_depgraph, m_linearization);
520 : 0 : LinearizationIndex lin_idx{0};
521 : : // Iterate over the chunks.
522 [ # # ]: 0 : for (unsigned chunk_idx = 0; chunk_idx < chunking.NumChunksLeft(); ++chunk_idx) {
523 : 0 : auto chunk = chunking.GetChunk(chunk_idx);
524 : 0 : Assume(chunk.transactions.Any());
525 : : // Iterate over the transactions in the linearization, which must match those in chunk.
526 : 0 : do {
527 : 0 : DepGraphIndex idx = m_linearization[lin_idx];
528 : 0 : GraphIndex graph_idx = m_mapping[idx];
529 : 0 : auto& entry = graph.m_entries[graph_idx];
530 : 0 : entry.m_main_lin_index = lin_idx++;
531 : 0 : entry.m_main_chunk_feerate = FeePerWeight::FromFeeFrac(chunk.feerate);
532 : 0 : Assume(chunk.transactions[idx]);
533 : 0 : chunk.transactions.Reset(idx);
534 [ # # ]: 0 : } while(chunk.transactions.Any());
535 : : }
536 : 0 : }
537 : 0 : }
538 : :
539 : 0 : void Cluster::GetConflicts(const TxGraphImpl& graph, std::vector<Cluster*>& out) const noexcept
540 : : {
541 : 0 : Assume(m_level == 1);
542 [ # # ]: 0 : for (auto i : m_linearization) {
543 [ # # ]: 0 : auto& entry = graph.m_entries[m_mapping[i]];
544 : : // For every transaction Entry in this Cluster, if it also exists in a lower-level Cluster,
545 : : // then that Cluster conflicts.
546 [ # # ]: 0 : if (entry.m_locator[0].IsPresent()) {
547 : 0 : out.push_back(entry.m_locator[0].cluster);
548 : : }
549 : : }
550 : 0 : }
551 : :
552 : 0 : std::vector<Cluster*> TxGraphImpl::GetConflicts() const noexcept
553 : : {
554 : 0 : Assume(GetTopLevel() == 1);
555 : 0 : auto& clusterset = GetClusterSet(1);
556 : 0 : std::vector<Cluster*> ret;
557 : : // All main Clusters containing transactions in m_removed (so (P,R) ones) are conflicts.
558 [ # # ]: 0 : for (auto i : clusterset.m_removed) {
559 [ # # ]: 0 : auto& entry = m_entries[i];
560 [ # # ]: 0 : if (entry.m_locator[0].IsPresent()) {
561 : 0 : ret.push_back(entry.m_locator[0].cluster);
562 : : }
563 : : }
564 : : // Then go over all Clusters at this level, and find their conflicts (the (P,P) ones).
565 [ # # ]: 0 : for (int quality = 0; quality < int(QualityLevel::NONE); ++quality) {
566 : 0 : auto& clusters = clusterset.m_clusters[quality];
567 [ # # ]: 0 : for (const auto& cluster : clusters) {
568 : 0 : cluster->GetConflicts(*this, ret);
569 : : }
570 : : }
571 : : // Deduplicate the result (the same Cluster may appear multiple times).
572 : 0 : std::sort(ret.begin(), ret.end());
573 : 0 : ret.erase(std::unique(ret.begin(), ret.end()), ret.end());
574 : 0 : return ret;
575 : : }
576 : :
577 : 0 : Cluster* Cluster::CopyToStaging(TxGraphImpl& graph) const noexcept
578 : : {
579 : : // Construct an empty Cluster.
580 : 0 : auto ret = std::make_unique<Cluster>();
581 : 0 : auto ptr = ret.get();
582 : : // Copy depgraph, mapping, and linearization/
583 : 0 : ptr->m_depgraph = m_depgraph;
584 : 0 : ptr->m_mapping = m_mapping;
585 : 0 : ptr->m_linearization = m_linearization;
586 : : // Insert the new Cluster into the graph.
587 : 0 : graph.InsertCluster(1, std::move(ret), m_quality);
588 : : // Update its Locators.
589 : 0 : ptr->Updated(graph);
590 : 0 : return ptr;
591 : 0 : }
592 : :
593 : 0 : void Cluster::ApplyRemovals(TxGraphImpl& graph, std::span<GraphIndex>& to_remove) noexcept
594 : : {
595 : : // Iterate over the prefix of to_remove that applies to this cluster.
596 : 0 : Assume(!to_remove.empty());
597 : 0 : SetType todo;
598 : 0 : do {
599 : 0 : GraphIndex idx = to_remove.front();
600 : 0 : Assume(idx < graph.m_entries.size());
601 [ # # ]: 0 : auto& entry = graph.m_entries[idx];
602 : 0 : auto& locator = entry.m_locator[m_level];
603 : : // Stop once we hit an entry that applies to another Cluster.
604 [ # # ]: 0 : if (locator.cluster != this) break;
605 : : // - Remember it in a set of to-remove DepGraphIndexes.
606 : 0 : todo.Set(locator.index);
607 : : // - Remove from m_mapping. This isn't strictly necessary as unused positions in m_mapping
608 : : // are just never accessed, but set it to -1 here to increase the ability to detect a bug
609 : : // that causes it to be accessed regardless.
610 [ # # ]: 0 : m_mapping[locator.index] = GraphIndex(-1);
611 : : // - Remove its linearization index from the Entry (if in main).
612 [ # # ]: 0 : if (m_level == 0) {
613 : 0 : entry.m_main_lin_index = LinearizationIndex(-1);
614 : : }
615 : : // - Mark it as missing/removed in the Entry's locator.
616 : 0 : graph.ClearLocator(m_level, idx);
617 [ # # ]: 0 : to_remove = to_remove.subspan(1);
618 [ # # ]: 0 : } while(!to_remove.empty());
619 : :
620 : 0 : auto quality = m_quality;
621 : 0 : Assume(todo.Any());
622 : : // Wipe from the Cluster's DepGraph (this is O(n) regardless of the number of entries
623 : : // removed, so we benefit from batching all the removals).
624 : 0 : m_depgraph.RemoveTransactions(todo);
625 : 0 : m_mapping.resize(m_depgraph.PositionRange());
626 : :
627 : : // First remove all removals at the end of the linearization.
628 [ # # # # ]: 0 : while (!m_linearization.empty() && todo[m_linearization.back()]) {
629 : 0 : todo.Reset(m_linearization.back());
630 : 0 : m_linearization.pop_back();
631 : : }
632 [ # # ]: 0 : if (todo.None()) {
633 : : // If no further removals remain, and thus all removals were at the end, we may be able
634 : : // to leave the cluster at a better quality level.
635 [ # # ]: 0 : if (IsAcceptable(/*after_split=*/true)) {
636 : : quality = QualityLevel::NEEDS_SPLIT_ACCEPTABLE;
637 : : } else {
638 : : quality = QualityLevel::NEEDS_SPLIT;
639 : : }
640 : : } else {
641 : : // If more removals remain, filter those out of m_linearization.
642 : 0 : m_linearization.erase(std::remove_if(
643 : : m_linearization.begin(),
644 : : m_linearization.end(),
645 : 0 : [&](auto pos) { return todo[pos]; }), m_linearization.end());
646 : 0 : quality = QualityLevel::NEEDS_SPLIT;
647 : : }
648 : 0 : graph.SetClusterQuality(m_level, m_quality, m_setindex, quality);
649 : 0 : Updated(graph);
650 : 0 : }
651 : :
652 : 0 : void Cluster::Clear(TxGraphImpl& graph) noexcept
653 : : {
654 [ # # ]: 0 : for (auto i : m_linearization) {
655 : 0 : graph.ClearLocator(m_level, m_mapping[i]);
656 : : }
657 : 0 : m_depgraph = {};
658 [ # # ]: 0 : m_linearization.clear();
659 [ # # ]: 0 : m_mapping.clear();
660 : 0 : }
661 : :
662 : 0 : void Cluster::MoveToMain(TxGraphImpl& graph) noexcept
663 : : {
664 : 0 : Assume(m_level == 1);
665 [ # # ]: 0 : for (auto i : m_linearization) {
666 : 0 : GraphIndex idx = m_mapping[i];
667 : 0 : auto& entry = graph.m_entries[idx];
668 : 0 : entry.m_locator[1].SetMissing();
669 : : }
670 : 0 : auto quality = m_quality;
671 : 0 : auto cluster = graph.ExtractCluster(1, quality, m_setindex);
672 : 0 : graph.InsertCluster(0, std::move(cluster), quality);
673 : 0 : Updated(graph);
674 : 0 : }
675 : :
676 : 0 : bool Cluster::Split(TxGraphImpl& graph) noexcept
677 : : {
678 : : // This function can only be called when the Cluster needs splitting.
679 : 0 : Assume(NeedsSplitting());
680 : : // Determine the new quality the split-off Clusters will have.
681 [ # # ]: 0 : QualityLevel new_quality = IsAcceptable(/*after_split=*/true) ? QualityLevel::ACCEPTABLE
682 : : : QualityLevel::NEEDS_RELINEARIZE;
683 : : // If we're going to produce ACCEPTABLE clusters (i.e., when in NEEDS_SPLIT_ACCEPTABLE), we
684 : : // need to post-linearize to make sure the split-out versions are all connected (as
685 : : // connectivity may have changed by removing part of the cluster). This could be done on each
686 : : // resulting split-out cluster separately, but it is simpler to do it once up front before
687 : : // splitting. This step is not necessary if the resulting clusters are NEEDS_RELINEARIZE, as
688 : : // they will be post-linearized anyway in MakeAcceptable().
689 : : if (new_quality == QualityLevel::ACCEPTABLE) {
690 : 0 : PostLinearize(m_depgraph, m_linearization);
691 : : }
692 : : /** Which positions are still left in this Cluster. */
693 : 0 : auto todo = m_depgraph.Positions();
694 : : /** Mapping from transaction positions in this Cluster to the Cluster where it ends up, and
695 : : * its position therein. */
696 : 0 : std::vector<std::pair<Cluster*, DepGraphIndex>> remap(m_depgraph.PositionRange());
697 : 0 : std::vector<Cluster*> new_clusters;
698 : 0 : bool first{true};
699 : : // Iterate over the connected components of this Cluster's m_depgraph.
700 [ # # ]: 0 : while (todo.Any()) {
701 : 0 : auto component = m_depgraph.FindConnectedComponent(todo);
702 [ # # ]: 0 : if (first && component == todo) {
703 : : // The existing Cluster is an entire component. Leave it be, but update its quality.
704 [ # # ]: 0 : Assume(todo == m_depgraph.Positions());
705 : 0 : graph.SetClusterQuality(m_level, m_quality, m_setindex, new_quality);
706 : : // If this made the quality ACCEPTABLE or OPTIMAL, we need to compute and cache its
707 : : // chunking.
708 : 0 : Updated(graph);
709 : 0 : return false;
710 : : }
711 : 0 : first = false;
712 : : // Construct a new Cluster to hold the found component.
713 : 0 : auto new_cluster = std::make_unique<Cluster>();
714 : 0 : new_clusters.push_back(new_cluster.get());
715 : : // Remember that all the component's transactions go to this new Cluster. The positions
716 : : // will be determined below, so use -1 for now.
717 [ # # # # ]: 0 : for (auto i : component) {
718 : 0 : remap[i] = {new_cluster.get(), DepGraphIndex(-1)};
719 : : }
720 : 0 : graph.InsertCluster(m_level, std::move(new_cluster), new_quality);
721 : 0 : todo -= component;
722 : 0 : }
723 : : // Redistribute the transactions.
724 [ # # ]: 0 : for (auto i : m_linearization) {
725 : : /** The cluster which transaction originally in position i is moved to. */
726 : 0 : Cluster* new_cluster = remap[i].first;
727 : : // Copy the transaction to the new cluster's depgraph, and remember the position.
728 : 0 : remap[i].second = new_cluster->m_depgraph.AddTransaction(m_depgraph.FeeRate(i));
729 : : // Create new mapping entry.
730 : 0 : new_cluster->m_mapping.push_back(m_mapping[i]);
731 : : // Create a new linearization entry. As we're only appending transactions, they equal the
732 : : // DepGraphIndex.
733 : 0 : new_cluster->m_linearization.push_back(remap[i].second);
734 : : }
735 : : // Redistribute the dependencies.
736 [ # # ]: 0 : for (auto i : m_linearization) {
737 : : /** The cluster transaction in position i is moved to. */
738 : 0 : Cluster* new_cluster = remap[i].first;
739 : : // Copy its parents, translating positions.
740 : 0 : SetType new_parents;
741 [ # # # # ]: 0 : for (auto par : m_depgraph.GetReducedParents(i)) new_parents.Set(remap[par].second);
742 : 0 : new_cluster->m_depgraph.AddDependencies(new_parents, remap[i].second);
743 : : }
744 : : // Update all the Locators of moved transactions.
745 [ # # ]: 0 : for (Cluster* new_cluster : new_clusters) {
746 : 0 : new_cluster->Updated(graph);
747 : : }
748 : : // Wipe this Cluster, and return that it needs to be deleted.
749 : 0 : m_depgraph = DepGraph<SetType>{};
750 [ # # ]: 0 : m_mapping.clear();
751 [ # # ]: 0 : m_linearization.clear();
752 : : return true;
753 : 0 : }
754 : :
755 : 0 : void Cluster::Merge(TxGraphImpl& graph, Cluster& other) noexcept
756 : : {
757 : : /** Vector to store the positions in this Cluster for each position in other. */
758 : 0 : std::vector<DepGraphIndex> remap(other.m_depgraph.PositionRange());
759 : : // Iterate over all transactions in the other Cluster (the one being absorbed).
760 [ # # ]: 0 : for (auto pos : other.m_linearization) {
761 : 0 : auto idx = other.m_mapping[pos];
762 : : // Copy the transaction into this Cluster, and remember its position.
763 : 0 : auto new_pos = m_depgraph.AddTransaction(other.m_depgraph.FeeRate(pos));
764 [ # # ]: 0 : remap[pos] = new_pos;
765 [ # # ]: 0 : if (new_pos == m_mapping.size()) {
766 : 0 : m_mapping.push_back(idx);
767 : : } else {
768 : 0 : m_mapping[new_pos] = idx;
769 : : }
770 : 0 : m_linearization.push_back(new_pos);
771 : : // Copy the transaction's dependencies, translating them using remap. Note that since
772 : : // pos iterates over other.m_linearization, which is in topological order, all parents
773 : : // of pos should already be in remap.
774 : 0 : SetType parents;
775 [ # # # # ]: 0 : for (auto par : other.m_depgraph.GetReducedParents(pos)) {
776 : 0 : parents.Set(remap[par]);
777 : : }
778 : 0 : m_depgraph.AddDependencies(parents, remap[pos]);
779 : : // Update the transaction's Locator. There is no need to call Updated() to update chunk
780 : : // feerates, as Updated() will be invoked by Cluster::ApplyDependencies on the resulting
781 : : // merged Cluster later anyway).
782 : 0 : graph.m_entries[idx].m_locator[m_level].SetPresent(this, new_pos);
783 : : }
784 : : // Purge the other Cluster, now that everything has been moved.
785 : 0 : other.m_depgraph = DepGraph<SetType>{};
786 [ # # ]: 0 : other.m_linearization.clear();
787 [ # # ]: 0 : other.m_mapping.clear();
788 : 0 : }
789 : :
790 : 0 : void Cluster::ApplyDependencies(TxGraphImpl& graph, std::span<std::pair<GraphIndex, GraphIndex>> to_apply) noexcept
791 : : {
792 : : // This function is invoked by TxGraphImpl::ApplyDependencies after merging groups of Clusters
793 : : // between which dependencies are added, which simply concatenates their linearizations. Invoke
794 : : // PostLinearize, which has the effect that the linearization becomes a merge-sort of the
795 : : // constituent linearizations. Do this here rather than in Cluster::Merge, because this
796 : : // function is only invoked once per merged Cluster, rather than once per constituent one.
797 : : // This concatenation + post-linearization could be replaced with an explicit merge-sort.
798 : 0 : PostLinearize(m_depgraph, m_linearization);
799 : :
800 : : // Sort the list of dependencies to apply by child, so those can be applied in batch.
801 [ # # # # : 0 : std::sort(to_apply.begin(), to_apply.end(), [](auto& a, auto& b) { return a.second < b.second; });
# # # # #
# # # # #
# # # # #
# # # #
# ]
802 : : // Iterate over groups of to-be-added dependencies with the same child.
803 : 0 : auto it = to_apply.begin();
804 [ # # ]: 0 : while (it != to_apply.end()) {
805 : 0 : auto& first_child = graph.m_entries[it->second].m_locator[m_level];
806 : 0 : const auto child_idx = first_child.index;
807 : : // Iterate over all to-be-added dependencies within that same child, gather the relevant
808 : : // parents.
809 : 0 : SetType parents;
810 [ # # ]: 0 : while (it != to_apply.end()) {
811 [ # # ]: 0 : auto& child = graph.m_entries[it->second].m_locator[m_level];
812 : 0 : auto& parent = graph.m_entries[it->first].m_locator[m_level];
813 [ # # # # ]: 0 : Assume(child.cluster == this && parent.cluster == this);
814 [ # # ]: 0 : if (child.index != child_idx) break;
815 : 0 : parents.Set(parent.index);
816 : 0 : ++it;
817 : : }
818 : : // Push all dependencies to the underlying DepGraph. Note that this is O(N) in the size of
819 : : // the cluster, regardless of the number of parents being added, so batching them together
820 : : // has a performance benefit.
821 : 0 : m_depgraph.AddDependencies(parents, child_idx);
822 : : }
823 : :
824 : : // Finally fix the linearization, as the new dependencies may have invalidated the
825 : : // linearization, and post-linearize it to fix up the worst problems with it.
826 : 0 : FixLinearization(m_depgraph, m_linearization);
827 : 0 : PostLinearize(m_depgraph, m_linearization);
828 : :
829 : : // Finally push the changes to graph.m_entries.
830 : 0 : Updated(graph);
831 : 0 : }
832 : :
833 : 0 : TxGraphImpl::~TxGraphImpl() noexcept
834 : : {
835 : : // If Refs outlive the TxGraphImpl they refer to, unlink them, so that their destructor does not
836 : : // try to reach into a non-existing TxGraphImpl anymore.
837 [ # # ]: 0 : for (auto& entry : m_entries) {
838 [ # # ]: 0 : if (entry.m_ref != nullptr) {
839 : 0 : GetRefGraph(*entry.m_ref) = nullptr;
840 : : }
841 : : }
842 : 0 : }
843 : :
844 : 0 : std::unique_ptr<Cluster> TxGraphImpl::ExtractCluster(int level, QualityLevel quality, ClusterSetIndex setindex) noexcept
845 : : {
846 : 0 : Assume(quality != QualityLevel::NONE);
847 : :
848 : 0 : auto& clusterset = GetClusterSet(level);
849 : 0 : auto& quality_clusters = clusterset.m_clusters[int(quality)];
850 : 0 : Assume(setindex < quality_clusters.size());
851 : :
852 : : // Extract the Cluster-owning unique_ptr.
853 [ # # ]: 0 : std::unique_ptr<Cluster> ret = std::move(quality_clusters[setindex]);
854 [ # # ]: 0 : ret->m_quality = QualityLevel::NONE;
855 : 0 : ret->m_setindex = ClusterSetIndex(-1);
856 : 0 : ret->m_level = -1;
857 : :
858 : : // Clean up space in quality_cluster.
859 [ # # ]: 0 : auto max_setindex = quality_clusters.size() - 1;
860 [ # # ]: 0 : if (setindex != max_setindex) {
861 : : // If the cluster was not the last element of quality_clusters, move that to take its place.
862 : 0 : quality_clusters.back()->m_setindex = setindex;
863 : 0 : quality_clusters.back()->m_level = level;
864 : 0 : quality_clusters[setindex] = std::move(quality_clusters.back());
865 : : }
866 : : // The last element of quality_clusters is now unused; drop it.
867 : 0 : quality_clusters.pop_back();
868 : :
869 : 0 : return ret;
870 : : }
871 : :
872 : 0 : ClusterSetIndex TxGraphImpl::InsertCluster(int level, std::unique_ptr<Cluster>&& cluster, QualityLevel quality) noexcept
873 : : {
874 : : // Cannot insert with quality level NONE (as that would mean not inserted).
875 : 0 : Assume(quality != QualityLevel::NONE);
876 : : // The passed-in Cluster must not currently be in the TxGraphImpl.
877 : 0 : Assume(cluster->m_quality == QualityLevel::NONE);
878 : :
879 : : // Append it at the end of the relevant TxGraphImpl::m_cluster.
880 : 0 : auto& clusterset = GetClusterSet(level);
881 : 0 : auto& quality_clusters = clusterset.m_clusters[int(quality)];
882 : 0 : ClusterSetIndex ret = quality_clusters.size();
883 : 0 : cluster->m_quality = quality;
884 : 0 : cluster->m_setindex = ret;
885 : 0 : cluster->m_level = level;
886 : 0 : quality_clusters.push_back(std::move(cluster));
887 : 0 : return ret;
888 : : }
889 : :
890 : 0 : void TxGraphImpl::SetClusterQuality(int level, QualityLevel old_quality, ClusterSetIndex old_index, QualityLevel new_quality) noexcept
891 : : {
892 : 0 : Assume(new_quality != QualityLevel::NONE);
893 : :
894 : : // Don't do anything if the quality did not change.
895 [ # # ]: 0 : if (old_quality == new_quality) return;
896 : : // Extract the cluster from where it currently resides.
897 : 0 : auto cluster_ptr = ExtractCluster(level, old_quality, old_index);
898 : : // And re-insert it where it belongs.
899 : 0 : InsertCluster(level, std::move(cluster_ptr), new_quality);
900 : 0 : }
901 : :
902 : 0 : void TxGraphImpl::DeleteCluster(Cluster& cluster) noexcept
903 : : {
904 : : // Extract the cluster from where it currently resides.
905 : 0 : auto cluster_ptr = ExtractCluster(cluster.m_level, cluster.m_quality, cluster.m_setindex);
906 : : // And throw it away.
907 [ # # ]: 0 : cluster_ptr.reset();
908 : 0 : }
909 : :
910 : 0 : Cluster* TxGraphImpl::FindCluster(GraphIndex idx, int level) const noexcept
911 : : {
912 [ # # # # ]: 0 : Assume(level >= 0 && level <= GetTopLevel());
913 : 0 : auto& entry = m_entries[idx];
914 : : // Search the entry's locators from top to bottom.
915 [ # # ]: 0 : for (int l = level; l >= 0; --l) {
916 : : // If the locator is missing, dig deeper; it may exist at a lower level and therefore be
917 : : // implicitly existing at this level too.
918 [ # # ]: 0 : if (entry.m_locator[l].IsMissing()) continue;
919 : : // If the locator has the entry marked as explicitly removed, stop.
920 [ # # ]: 0 : if (entry.m_locator[l].IsRemoved()) break;
921 : : // Otherwise, we have found the topmost ClusterSet that contains this entry.
922 : : return entry.m_locator[l].cluster;
923 : : }
924 : : // If no non-empty locator was found, or an explicitly removed was hit, return nothing.
925 : : return nullptr;
926 : : }
927 : :
928 : 0 : Cluster* TxGraphImpl::PullIn(Cluster* cluster) noexcept
929 : : {
930 : 0 : int to_level = GetTopLevel();
931 : 0 : Assume(to_level == 1);
932 : 0 : int level = cluster->m_level;
933 : 0 : Assume(level <= to_level);
934 : : // Copy the Cluster from main to staging, if it's not already there.
935 [ # # ]: 0 : if (level == 0) {
936 : : // Make the Cluster Acceptable before copying. This isn't strictly necessary, but doing it
937 : : // now avoids doing double work later.
938 : 0 : MakeAcceptable(*cluster);
939 : 0 : cluster = cluster->CopyToStaging(*this);
940 : : }
941 : 0 : return cluster;
942 : : }
943 : :
944 : 0 : void TxGraphImpl::ApplyRemovals(int up_to_level) noexcept
945 : : {
946 [ # # # # ]: 0 : Assume(up_to_level >= 0 && up_to_level <= GetTopLevel());
947 [ # # ]: 0 : for (int level = 0; level <= up_to_level; ++level) {
948 : 0 : auto& clusterset = GetClusterSet(level);
949 : 0 : auto& to_remove = clusterset.m_to_remove;
950 : : // Skip if there is nothing to remove in this level.
951 [ # # ]: 0 : if (to_remove.empty()) continue;
952 : : // Pull in all Clusters that are not in staging.
953 [ # # ]: 0 : if (level == 1) {
954 [ # # ]: 0 : for (GraphIndex index : to_remove) {
955 : 0 : auto cluster = FindCluster(index, level);
956 [ # # ]: 0 : if (cluster != nullptr) PullIn(cluster);
957 : : }
958 : : }
959 : : // Group the set of to-be-removed entries by Cluster*.
960 : 0 : std::sort(to_remove.begin(), to_remove.end(), [&](GraphIndex a, GraphIndex b) noexcept {
961 : 0 : return std::less{}(m_entries[a].m_locator[level].cluster, m_entries[b].m_locator[level].cluster);
962 : : });
963 : : // Process per Cluster.
964 : 0 : std::span to_remove_span{to_remove};
965 [ # # ]: 0 : while (!to_remove_span.empty()) {
966 [ # # ]: 0 : Cluster* cluster = m_entries[to_remove_span.front()].m_locator[level].cluster;
967 [ # # ]: 0 : if (cluster != nullptr) {
968 : : // If the first to_remove_span entry's Cluster exists, hand to_remove_span to it, so it
969 : : // can pop off whatever applies to it.
970 : 0 : cluster->ApplyRemovals(*this, to_remove_span);
971 : : } else {
972 : : // Otherwise, skip this already-removed entry. This may happen when
973 : : // RemoveTransaction was called twice on the same Ref, for example.
974 : 0 : to_remove_span = to_remove_span.subspan(1);
975 : : }
976 : : }
977 [ # # ]: 0 : to_remove.clear();
978 : : }
979 : 0 : Compact();
980 : 0 : }
981 : :
982 : 0 : void TxGraphImpl::SwapIndexes(GraphIndex a, GraphIndex b) noexcept
983 : : {
984 : 0 : Assume(a < m_entries.size());
985 : 0 : Assume(b < m_entries.size());
986 : : // Swap the Entry objects.
987 : 0 : std::swap(m_entries[a], m_entries[b]);
988 : : // Iterate over both objects.
989 [ # # ]: 0 : for (int i = 0; i < 2; ++i) {
990 [ # # ]: 0 : GraphIndex idx = i ? b : a;
991 [ # # ]: 0 : Entry& entry = m_entries[idx];
992 : : // Update linked Ref, if any exists.
993 [ # # ]: 0 : if (entry.m_ref) GetRefIndex(*entry.m_ref) = idx;
994 : : // Update the locators for both levels. The rest of the Entry information will not change,
995 : : // so no need to invoke Cluster::Updated().
996 [ # # ]: 0 : for (int level = 0; level < MAX_LEVELS; ++level) {
997 : 0 : Locator& locator = entry.m_locator[level];
998 [ # # ]: 0 : if (locator.IsPresent()) {
999 : 0 : locator.cluster->UpdateMapping(locator.index, idx);
1000 : : }
1001 : : }
1002 : : }
1003 : 0 : }
1004 : :
1005 : 0 : void TxGraphImpl::Compact() noexcept
1006 : : {
1007 : : // We cannot compact while any to-be-applied operations or staged removals remain as we'd need
1008 : : // to rewrite them. It is easier to delay the compaction until they have been applied.
1009 [ # # ]: 0 : if (!m_main_clusterset.m_deps_to_add.empty()) return;
1010 [ # # ]: 0 : if (!m_main_clusterset.m_to_remove.empty()) return;
1011 : 0 : Assume(m_main_clusterset.m_removed.empty()); // non-staging m_removed is always empty
1012 [ # # ]: 0 : if (m_staging_clusterset.has_value()) {
1013 [ # # ]: 0 : if (!m_staging_clusterset->m_deps_to_add.empty()) return;
1014 [ # # ]: 0 : if (!m_staging_clusterset->m_to_remove.empty()) return;
1015 [ # # ]: 0 : if (!m_staging_clusterset->m_removed.empty()) return;
1016 : : }
1017 : :
1018 : : // Sort the GraphIndexes that need to be cleaned up. They are sorted in reverse, so the last
1019 : : // ones get processed first. This means earlier-processed GraphIndexes will not cause moving of
1020 : : // later-processed ones during the "swap with end of m_entries" step below (which might
1021 : : // invalidate them).
1022 : 0 : std::sort(m_unlinked.begin(), m_unlinked.end(), std::greater{});
1023 : :
1024 : 0 : auto last = GraphIndex(-1);
1025 [ # # ]: 0 : for (GraphIndex idx : m_unlinked) {
1026 : : // m_unlinked should never contain the same GraphIndex twice (the code below would fail
1027 : : // if so, because GraphIndexes get invalidated by removing them).
1028 : 0 : Assume(idx != last);
1029 : 0 : last = idx;
1030 : :
1031 : : // Make sure the entry is unlinked.
1032 : 0 : Entry& entry = m_entries[idx];
1033 : 0 : Assume(entry.m_ref == nullptr);
1034 : : // Make sure the entry does not occur in the graph.
1035 [ # # ]: 0 : for (int level = 0; level < MAX_LEVELS; ++level) {
1036 : 0 : Assume(!entry.m_locator[level].IsPresent());
1037 : : }
1038 : :
1039 : : // Move the entry to the end.
1040 [ # # ]: 0 : if (idx != m_entries.size() - 1) SwapIndexes(idx, m_entries.size() - 1);
1041 : : // Drop the entry for idx, now that it is at the end.
1042 : 0 : m_entries.pop_back();
1043 : : }
1044 [ # # ]: 0 : m_unlinked.clear();
1045 : : }
1046 : :
1047 : 0 : void TxGraphImpl::Split(Cluster& cluster) noexcept
1048 : : {
1049 : : // To split a Cluster, first make sure all removals are applied (as we might need to split
1050 : : // again afterwards otherwise).
1051 : 0 : ApplyRemovals(cluster.m_level);
1052 : 0 : bool del = cluster.Split(*this);
1053 [ # # ]: 0 : if (del) {
1054 : : // Cluster::Split reports whether the Cluster is to be deleted.
1055 : 0 : DeleteCluster(cluster);
1056 : : }
1057 : 0 : }
1058 : :
1059 : 0 : void TxGraphImpl::SplitAll(int up_to_level) noexcept
1060 : : {
1061 [ # # # # ]: 0 : Assume(up_to_level >= 0 && up_to_level <= GetTopLevel());
1062 : : // Before splitting all Cluster, first make sure all removals are applied.
1063 : 0 : ApplyRemovals(up_to_level);
1064 [ # # ]: 0 : for (int level = 0; level <= up_to_level; ++level) {
1065 [ # # ]: 0 : for (auto quality : {QualityLevel::NEEDS_SPLIT, QualityLevel::NEEDS_SPLIT_ACCEPTABLE}) {
1066 : 0 : auto& queue = GetClusterSet(level).m_clusters[int(quality)];
1067 [ # # ]: 0 : while (!queue.empty()) {
1068 : 0 : Split(*queue.back().get());
1069 : : }
1070 : : }
1071 : : }
1072 : 0 : }
1073 : :
1074 : 0 : void TxGraphImpl::GroupClusters(int level) noexcept
1075 : : {
1076 : 0 : auto& clusterset = GetClusterSet(level);
1077 : : // If the groupings have been computed already, nothing is left to be done.
1078 [ # # ]: 0 : if (clusterset.m_group_data.has_value()) return;
1079 : :
1080 : : // Before computing which Clusters need to be merged together, first apply all removals and
1081 : : // split the Clusters into connected components. If we would group first, we might end up
1082 : : // with inefficient and/or oversized Clusters which just end up being split again anyway.
1083 : 0 : SplitAll(level);
1084 : :
1085 : : /** Annotated clusters: an entry for each Cluster, together with the representative for the
1086 : : * partition it is in if known, or with nullptr if not yet known. */
1087 : 0 : std::vector<std::pair<Cluster*, Cluster*>> an_clusters;
1088 : : /** Annotated dependencies: an entry for each m_deps_to_add entry (excluding ones that apply
1089 : : * to removed transactions), together with the representative root of the partition of
1090 : : * Clusters it applies to. */
1091 : 0 : std::vector<std::pair<std::pair<GraphIndex, GraphIndex>, Cluster*>> an_deps;
1092 : :
1093 : : // Construct a an_clusters entry for every parent and child in the to-be-applied dependencies.
1094 [ # # ]: 0 : for (const auto& [par, chl] : clusterset.m_deps_to_add) {
1095 : 0 : auto par_cluster = FindCluster(par, level);
1096 : 0 : auto chl_cluster = FindCluster(chl, level);
1097 : : // Skip dependencies for which the parent or child transaction is removed.
1098 [ # # # # ]: 0 : if (par_cluster == nullptr || chl_cluster == nullptr) continue;
1099 : 0 : an_clusters.emplace_back(par_cluster, nullptr);
1100 : : // Do not include a duplicate when parent and child are identical, as it'll be removed
1101 : : // below anyway.
1102 [ # # ]: 0 : if (chl_cluster != par_cluster) an_clusters.emplace_back(chl_cluster, nullptr);
1103 : : }
1104 : : // Sort and deduplicate an_clusters, so we end up with a sorted list of all involved Clusters
1105 : : // to which dependencies apply.
1106 : 0 : std::sort(an_clusters.begin(), an_clusters.end());
1107 : 0 : an_clusters.erase(std::unique(an_clusters.begin(), an_clusters.end()), an_clusters.end());
1108 : :
1109 : : // Sort the dependencies by child Cluster.
1110 : 0 : std::sort(clusterset.m_deps_to_add.begin(), clusterset.m_deps_to_add.end(), [&](auto& a, auto& b) noexcept {
1111 : 0 : auto [_a_par, a_chl] = a;
1112 : 0 : auto [_b_par, b_chl] = b;
1113 : 0 : auto a_chl_cluster = FindCluster(a_chl, level);
1114 : 0 : auto b_chl_cluster = FindCluster(b_chl, level);
1115 : 0 : return std::less{}(a_chl_cluster, b_chl_cluster);
1116 : : });
1117 : :
1118 : : // Run the union-find algorithm to to find partitions of the input Clusters which need to be
1119 : : // grouped together. See https://en.wikipedia.org/wiki/Disjoint-set_data_structure.
1120 : 0 : {
1121 : : /** Each PartitionData entry contains information about a single input Cluster. */
1122 : 0 : struct PartitionData
1123 : : {
1124 : : /** The cluster this holds information for. */
1125 : : Cluster* cluster;
1126 : : /** All PartitionData entries belonging to the same partition are organized in a tree.
1127 : : * Each element points to its parent, or to itself if it is the root. The root is then
1128 : : * a representative for the entire tree, and can be found by walking upwards from any
1129 : : * element. */
1130 : : PartitionData* parent;
1131 : : /** (only if this is a root, so when parent == this) An upper bound on the height of
1132 : : * tree for this partition. */
1133 : : unsigned rank;
1134 : : };
1135 : : /** Information about each input Cluster. Sorted by Cluster* pointer. */
1136 : 0 : std::vector<PartitionData> partition_data;
1137 : :
1138 : : /** Given a Cluster, find its corresponding PartitionData. */
1139 : 0 : auto locate_fn = [&](Cluster* arg) noexcept -> PartitionData* {
1140 : 0 : auto it = std::lower_bound(partition_data.begin(), partition_data.end(), arg,
1141 [ # # ]: 0 : [](auto& a, Cluster* ptr) noexcept { return a.cluster < ptr; });
1142 : 0 : Assume(it != partition_data.end());
1143 : 0 : Assume(it->cluster == arg);
1144 : 0 : return &*it;
1145 : 0 : };
1146 : :
1147 : : /** Given a PartitionData, find the root of the tree it is in (its representative). */
1148 : 0 : static constexpr auto find_root_fn = [](PartitionData* data) noexcept -> PartitionData* {
1149 [ # # # # ]: 0 : while (data->parent != data) {
1150 : : // Replace pointers to parents with pointers to grandparents.
1151 : : // See https://en.wikipedia.org/wiki/Disjoint-set_data_structure#Finding_set_representatives.
1152 : 0 : auto par = data->parent;
1153 : 0 : data->parent = par->parent;
1154 : 0 : data = par;
1155 : : }
1156 : 0 : return data;
1157 : : };
1158 : :
1159 : : /** Given two PartitionDatas, union the partitions they are in, and return their
1160 : : * representative. */
1161 : 0 : static constexpr auto union_fn = [](PartitionData* arg1, PartitionData* arg2) noexcept {
1162 : : // Find the roots of the trees, and bail out if they are already equal (which would
1163 : : // mean they are in the same partition already).
1164 [ # # ]: 0 : auto rep1 = find_root_fn(arg1);
1165 : 0 : auto rep2 = find_root_fn(arg2);
1166 [ # # ]: 0 : if (rep1 == rep2) return rep1;
1167 : : // Pick the lower-rank root to become a child of the higher-rank one.
1168 : : // See https://en.wikipedia.org/wiki/Disjoint-set_data_structure#Union_by_rank.
1169 [ # # ]: 0 : if (rep1->rank < rep2->rank) std::swap(rep1, rep2);
1170 : 0 : rep2->parent = rep1;
1171 : 0 : rep1->rank += (rep1->rank == rep2->rank);
1172 : 0 : return rep1;
1173 : : };
1174 : :
1175 : : // Start by initializing every Cluster as its own singleton partition.
1176 : 0 : partition_data.resize(an_clusters.size());
1177 [ # # ]: 0 : for (size_t i = 0; i < an_clusters.size(); ++i) {
1178 : 0 : partition_data[i].cluster = an_clusters[i].first;
1179 : 0 : partition_data[i].parent = &partition_data[i];
1180 : 0 : partition_data[i].rank = 0;
1181 : : }
1182 : :
1183 : : // Run through all parent/child pairs in m_deps_to_add, and union the
1184 : : // the partitions their Clusters are in.
1185 : 0 : Cluster* last_chl_cluster{nullptr};
1186 : 0 : PartitionData* last_partition{nullptr};
1187 [ # # ]: 0 : for (const auto& [par, chl] : clusterset.m_deps_to_add) {
1188 : 0 : auto par_cluster = FindCluster(par, level);
1189 : 0 : auto chl_cluster = FindCluster(chl, level);
1190 : : // Nothing to do if parent and child are in the same Cluster.
1191 [ # # ]: 0 : if (par_cluster == chl_cluster) continue;
1192 : : // Nothing to do if either parent or child transaction is removed already.
1193 [ # # ]: 0 : if (par_cluster == nullptr || chl_cluster == nullptr) continue;
1194 : 0 : Assume(par != chl);
1195 [ # # ]: 0 : if (chl_cluster == last_chl_cluster) {
1196 : : // If the child Clusters is the same as the previous iteration, union with the
1197 : : // tree they were in, avoiding the need for another lookup. Note that m_deps_to_add
1198 : : // is sorted by child Cluster, so batches with the same child are expected.
1199 : 0 : last_partition = union_fn(locate_fn(par_cluster), last_partition);
1200 : : } else {
1201 : 0 : last_chl_cluster = chl_cluster;
1202 : 0 : last_partition = union_fn(locate_fn(par_cluster), locate_fn(chl_cluster));
1203 : : }
1204 : : }
1205 : :
1206 : : // Populate the an_clusters and an_deps data structures with the list of input Clusters,
1207 : : // and the input dependencies, annotated with the representative of the Cluster partition
1208 : : // it applies to.
1209 : 0 : an_deps.reserve(clusterset.m_deps_to_add.size());
1210 : 0 : auto deps_it = clusterset.m_deps_to_add.begin();
1211 [ # # ]: 0 : for (size_t i = 0; i < partition_data.size(); ++i) {
1212 : 0 : auto& data = partition_data[i];
1213 : : // Find the representative of the partition Cluster i is in, and store it with the
1214 : : // Cluster.
1215 : 0 : auto rep = find_root_fn(&data)->cluster;
1216 : 0 : Assume(an_clusters[i].second == nullptr);
1217 : 0 : an_clusters[i].second = rep;
1218 : : // Find all dependencies whose child Cluster is Cluster i, and annotate them with rep.
1219 [ # # ]: 0 : while (deps_it != clusterset.m_deps_to_add.end()) {
1220 : 0 : auto [par, chl] = *deps_it;
1221 : 0 : auto chl_cluster = FindCluster(chl, level);
1222 [ # # ]: 0 : if (std::greater{}(chl_cluster, data.cluster)) break;
1223 : : // Skip dependencies that apply to earlier Clusters (those necessary are for
1224 : : // deleted transactions, as otherwise we'd have processed them already).
1225 [ # # ]: 0 : if (chl_cluster == data.cluster) {
1226 : 0 : auto par_cluster = FindCluster(par, level);
1227 : : // Also filter out dependencies applying to a removed parent.
1228 [ # # ]: 0 : if (par_cluster != nullptr) an_deps.emplace_back(*deps_it, rep);
1229 : : }
1230 : 0 : ++deps_it;
1231 : : }
1232 : : }
1233 : 0 : }
1234 : :
1235 : : // Sort both an_clusters and an_deps by representative of the partition they are in, grouping
1236 : : // all those applying to the same partition together.
1237 [ # # # # : 0 : std::sort(an_deps.begin(), an_deps.end(), [](auto& a, auto& b) noexcept { return a.second < b.second; });
# # # # #
# # # # #
# # # # #
# # # #
# ]
1238 [ # # # # : 0 : std::sort(an_clusters.begin(), an_clusters.end(), [](auto& a, auto& b) noexcept { return a.second < b.second; });
# # # # #
# # # # #
# # # # #
# # # #
# ]
1239 : :
1240 : : // Translate the resulting cluster groups to the m_group_data structure, and the dependencies
1241 : : // back to m_deps_to_add.
1242 : 0 : clusterset.m_group_data = GroupData{};
1243 : 0 : clusterset.m_group_data->m_group_clusters.reserve(an_clusters.size());
1244 [ # # ]: 0 : clusterset.m_group_data->m_group_oversized = false;
1245 [ # # ]: 0 : clusterset.m_deps_to_add.clear();
1246 : 0 : clusterset.m_deps_to_add.reserve(an_deps.size());
1247 : 0 : auto an_deps_it = an_deps.begin();
1248 : 0 : auto an_clusters_it = an_clusters.begin();
1249 [ # # ]: 0 : while (an_clusters_it != an_clusters.end()) {
1250 : : // Process all clusters/dependencies belonging to the partition with representative rep.
1251 : 0 : auto rep = an_clusters_it->second;
1252 : : // Create and initialize a new GroupData entry for the partition.
1253 : 0 : auto& new_entry = clusterset.m_group_data->m_groups.emplace_back();
1254 : 0 : new_entry.m_cluster_offset = clusterset.m_group_data->m_group_clusters.size();
1255 : 0 : new_entry.m_cluster_count = 0;
1256 : 0 : new_entry.m_deps_offset = clusterset.m_deps_to_add.size();
1257 : 0 : new_entry.m_deps_count = 0;
1258 : 0 : uint32_t total_count{0};
1259 : : // Add all its clusters to it (copying those from an_clusters to m_group_clusters).
1260 [ # # # # ]: 0 : while (an_clusters_it != an_clusters.end() && an_clusters_it->second == rep) {
1261 : 0 : clusterset.m_group_data->m_group_clusters.push_back(an_clusters_it->first);
1262 : 0 : total_count += an_clusters_it->first->GetTxCount();
1263 : 0 : ++an_clusters_it;
1264 : 0 : ++new_entry.m_cluster_count;
1265 : : }
1266 : : // Add all its dependencies to it (copying those back from an_deps to m_deps_to_add).
1267 [ # # # # ]: 0 : while (an_deps_it != an_deps.end() && an_deps_it->second == rep) {
1268 : 0 : clusterset.m_deps_to_add.push_back(an_deps_it->first);
1269 : 0 : ++an_deps_it;
1270 : 0 : ++new_entry.m_deps_count;
1271 : : }
1272 : : // Detect oversizedness.
1273 [ # # ]: 0 : if (total_count > m_max_cluster_count) {
1274 : 0 : clusterset.m_group_data->m_group_oversized = true;
1275 : : }
1276 : : }
1277 : 0 : Assume(an_deps_it == an_deps.end());
1278 : 0 : Assume(an_clusters_it == an_clusters.end());
1279 : 0 : clusterset.m_oversized = clusterset.m_group_data->m_group_oversized;
1280 : 0 : Compact();
1281 : 0 : }
1282 : :
1283 : 0 : void TxGraphImpl::Merge(std::span<Cluster*> to_merge) noexcept
1284 : : {
1285 : 0 : Assume(!to_merge.empty());
1286 : : // Nothing to do if a group consists of just a single Cluster.
1287 [ # # ]: 0 : if (to_merge.size() == 1) return;
1288 : :
1289 : : // Move the largest Cluster to the front of to_merge. As all transactions in other to-be-merged
1290 : : // Clusters will be moved to that one, putting the largest one first minimizes the number of
1291 : : // moves.
1292 : 0 : size_t max_size_pos{0};
1293 : 0 : DepGraphIndex max_size = to_merge[max_size_pos]->GetTxCount();
1294 [ # # ]: 0 : for (size_t i = 1; i < to_merge.size(); ++i) {
1295 [ # # ]: 0 : DepGraphIndex size = to_merge[i]->GetTxCount();
1296 [ # # ]: 0 : if (size > max_size) {
1297 : 0 : max_size_pos = i;
1298 : 0 : max_size = size;
1299 : : }
1300 : : }
1301 [ # # ]: 0 : if (max_size_pos != 0) std::swap(to_merge[0], to_merge[max_size_pos]);
1302 : :
1303 : : // Merge all further Clusters in the group into the first one, and delete them.
1304 [ # # ]: 0 : for (size_t i = 1; i < to_merge.size(); ++i) {
1305 : 0 : to_merge[0]->Merge(*this, *to_merge[i]);
1306 : 0 : DeleteCluster(*to_merge[i]);
1307 : : }
1308 : : }
1309 : :
1310 : 0 : void TxGraphImpl::ApplyDependencies(int level) noexcept
1311 : : {
1312 : 0 : auto& clusterset = GetClusterSet(level);
1313 : : // Do not bother computing groups if we already know the result will be oversized.
1314 [ # # ]: 0 : if (clusterset.m_oversized == true) return;
1315 : : // Compute the groups of to-be-merged Clusters (which also applies all removals, and splits).
1316 : 0 : GroupClusters(level);
1317 : 0 : Assume(clusterset.m_group_data.has_value());
1318 : : // Nothing to do if there are no dependencies to be added.
1319 [ # # ]: 0 : if (clusterset.m_deps_to_add.empty()) return;
1320 : : // Dependencies cannot be applied if it would result in oversized clusters.
1321 [ # # ]: 0 : if (clusterset.m_group_data->m_group_oversized) return;
1322 : :
1323 : : // For each group of to-be-merged Clusters.
1324 [ # # ]: 0 : for (const auto& group_entry : clusterset.m_group_data->m_groups) {
1325 [ # # ]: 0 : auto cluster_span = std::span{clusterset.m_group_data->m_group_clusters}
1326 [ # # ]: 0 : .subspan(group_entry.m_cluster_offset, group_entry.m_cluster_count);
1327 : : // Pull in all the Clusters that contain dependencies.
1328 [ # # ]: 0 : if (level == 1) {
1329 [ # # ]: 0 : for (Cluster*& cluster : cluster_span) {
1330 : 0 : cluster = PullIn(cluster);
1331 : : }
1332 : : }
1333 : : // Invoke Merge() to merge them into a single Cluster.
1334 : 0 : Merge(cluster_span);
1335 : : // Actually apply all to-be-added dependencies (all parents and children from this grouping
1336 : : // belong to the same Cluster at this point because of the merging above).
1337 : 0 : auto deps_span = std::span{clusterset.m_deps_to_add}
1338 : 0 : .subspan(group_entry.m_deps_offset, group_entry.m_deps_count);
1339 : 0 : Assume(!deps_span.empty());
1340 : 0 : const auto& loc = m_entries[deps_span[0].second].m_locator[level];
1341 : 0 : Assume(loc.IsPresent());
1342 : 0 : loc.cluster->ApplyDependencies(*this, deps_span);
1343 : : }
1344 : :
1345 : : // Wipe the list of to-be-added dependencies now that they are applied.
1346 [ # # ]: 0 : clusterset.m_deps_to_add.clear();
1347 : 0 : Compact();
1348 : : // Also no further Cluster mergings are needed (note that we clear, but don't set to
1349 : : // std::nullopt, as that would imply the groupings are unknown).
1350 : 0 : clusterset.m_group_data = GroupData{};
1351 : : }
1352 : :
1353 : 0 : void Cluster::Relinearize(TxGraphImpl& graph, uint64_t max_iters) noexcept
1354 : : {
1355 : : // We can only relinearize Clusters that do not need splitting.
1356 : 0 : Assume(!NeedsSplitting());
1357 : : // No work is required for Clusters which are already optimally linearized.
1358 [ # # ]: 0 : if (IsOptimal()) return;
1359 : : // Invoke the actual linearization algorithm (passing in the existing one).
1360 : 0 : uint64_t rng_seed = graph.m_rng.rand64();
1361 [ # # ]: 0 : auto [linearization, optimal] = Linearize(m_depgraph, max_iters, rng_seed, m_linearization);
1362 : : // Postlinearize if the result isn't optimal already. This guarantees (among other things)
1363 : : // that the chunks of the resulting linearization are all connected.
1364 [ # # ]: 0 : if (!optimal) PostLinearize(m_depgraph, linearization);
1365 : : // Update the linearization.
1366 : 0 : m_linearization = std::move(linearization);
1367 : : // Update the Cluster's quality.
1368 [ # # ]: 0 : auto new_quality = optimal ? QualityLevel::OPTIMAL : QualityLevel::ACCEPTABLE;
1369 : 0 : graph.SetClusterQuality(m_level, m_quality, m_setindex, new_quality);
1370 : : // Update the Entry objects.
1371 : 0 : Updated(graph);
1372 : 0 : }
1373 : :
1374 : 0 : void TxGraphImpl::MakeAcceptable(Cluster& cluster) noexcept
1375 : : {
1376 : : // Relinearize the Cluster if needed.
1377 [ # # ]: 0 : if (!cluster.NeedsSplitting() && !cluster.IsAcceptable()) {
1378 : 0 : cluster.Relinearize(*this, 10000);
1379 : : }
1380 : 0 : }
1381 : :
1382 : 0 : void TxGraphImpl::MakeAllAcceptable(int level) noexcept
1383 : : {
1384 : 0 : ApplyDependencies(level);
1385 : 0 : auto& clusterset = GetClusterSet(level);
1386 [ # # ]: 0 : if (clusterset.m_oversized == true) return;
1387 : 0 : auto& queue = clusterset.m_clusters[int(QualityLevel::NEEDS_RELINEARIZE)];
1388 [ # # ]: 0 : while (!queue.empty()) {
1389 : 0 : MakeAcceptable(*queue.back().get());
1390 : : }
1391 : : }
1392 : :
1393 : 0 : Cluster::Cluster(TxGraphImpl& graph, const FeePerWeight& feerate, GraphIndex graph_index) noexcept
1394 : : {
1395 : : // Create a new transaction in the DepGraph, and remember its position in m_mapping.
1396 : 0 : auto cluster_idx = m_depgraph.AddTransaction(feerate);
1397 : 0 : m_mapping.push_back(graph_index);
1398 : 0 : m_linearization.push_back(cluster_idx);
1399 : 0 : }
1400 : :
1401 : 0 : TxGraph::Ref TxGraphImpl::AddTransaction(const FeePerWeight& feerate) noexcept
1402 : : {
1403 : : // Construct a new Ref.
1404 : 0 : Ref ret;
1405 : : // Construct a new Entry, and link it with the Ref.
1406 : 0 : auto idx = m_entries.size();
1407 : 0 : m_entries.emplace_back();
1408 : 0 : auto& entry = m_entries.back();
1409 : 0 : entry.m_ref = &ret;
1410 : 0 : GetRefGraph(ret) = this;
1411 : 0 : GetRefIndex(ret) = idx;
1412 : : // Construct a new singleton Cluster (which is necessarily optimally linearized).
1413 : 0 : auto cluster = std::make_unique<Cluster>(*this, feerate, idx);
1414 : 0 : auto cluster_ptr = cluster.get();
1415 : 0 : int level = GetTopLevel();
1416 : 0 : auto& clusterset = GetClusterSet(level);
1417 : 0 : InsertCluster(level, std::move(cluster), QualityLevel::OPTIMAL);
1418 : 0 : cluster_ptr->Updated(*this);
1419 : 0 : ++clusterset.m_txcount;
1420 : : // Return the Ref.
1421 : 0 : return ret;
1422 : 0 : }
1423 : :
1424 : 0 : void TxGraphImpl::RemoveTransaction(const Ref& arg) noexcept
1425 : : {
1426 : : // Don't do anything if the Ref is empty (which may be indicative of the transaction already
1427 : : // having been removed).
1428 [ # # ]: 0 : if (GetRefGraph(arg) == nullptr) return;
1429 : 0 : Assume(GetRefGraph(arg) == this);
1430 : : // Find the Cluster the transaction is in, and stop if it isn't in any.
1431 : 0 : int level = GetTopLevel();
1432 : 0 : auto cluster = FindCluster(GetRefIndex(arg), level);
1433 [ # # ]: 0 : if (cluster == nullptr) return;
1434 : : // Remember that the transaction is to be removed.
1435 : 0 : auto& clusterset = GetClusterSet(level);
1436 : 0 : clusterset.m_to_remove.push_back(GetRefIndex(arg));
1437 : : // Wipe m_group_data (as it will need to be recomputed).
1438 [ # # ]: 0 : clusterset.m_group_data.reset();
1439 [ # # ]: 0 : if (clusterset.m_oversized == true) clusterset.m_oversized = std::nullopt;
1440 : : }
1441 : :
1442 : 0 : void TxGraphImpl::AddDependency(const Ref& parent, const Ref& child) noexcept
1443 : : {
1444 : : // Don't do anything if either Ref is empty (which may be indicative of it having already been
1445 : : // removed).
1446 [ # # # # ]: 0 : if (GetRefGraph(parent) == nullptr || GetRefGraph(child) == nullptr) return;
1447 [ # # # # ]: 0 : Assume(GetRefGraph(parent) == this && GetRefGraph(child) == this);
1448 : : // Don't do anything if this is a dependency on self.
1449 [ # # ]: 0 : if (GetRefIndex(parent) == GetRefIndex(child)) return;
1450 : : // Find the Cluster the parent and child transaction are in, and stop if either appears to be
1451 : : // already removed.
1452 : 0 : int level = GetTopLevel();
1453 : 0 : auto par_cluster = FindCluster(GetRefIndex(parent), level);
1454 [ # # ]: 0 : if (par_cluster == nullptr) return;
1455 : 0 : auto chl_cluster = FindCluster(GetRefIndex(child), level);
1456 [ # # ]: 0 : if (chl_cluster == nullptr) return;
1457 : : // Remember that this dependency is to be applied.
1458 : 0 : auto& clusterset = GetClusterSet(level);
1459 : 0 : clusterset.m_deps_to_add.emplace_back(GetRefIndex(parent), GetRefIndex(child));
1460 : : // Wipe m_group_data (as it will need to be recomputed).
1461 [ # # ]: 0 : clusterset.m_group_data.reset();
1462 [ # # ]: 0 : if (clusterset.m_oversized == false) clusterset.m_oversized = std::nullopt;
1463 : : }
1464 : :
1465 : 0 : bool TxGraphImpl::Exists(const Ref& arg, bool main_only) noexcept
1466 : : {
1467 [ # # ]: 0 : if (GetRefGraph(arg) == nullptr) return false;
1468 : 0 : Assume(GetRefGraph(arg) == this);
1469 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1470 : : // Make sure the transaction isn't scheduled for removal.
1471 : 0 : ApplyRemovals(level);
1472 : 0 : auto cluster = FindCluster(GetRefIndex(arg), level);
1473 : 0 : return cluster != nullptr;
1474 : : }
1475 : :
1476 : 0 : void Cluster::GetAncestorRefs(const TxGraphImpl& graph, std::span<std::pair<Cluster*, DepGraphIndex>>& args, std::vector<TxGraph::Ref*>& output) noexcept
1477 : : {
1478 : : /** The union of all ancestors to be returned. */
1479 : 0 : SetType ancestors_union;
1480 : : // Process elements from the front of args, as long as they apply.
1481 [ # # ]: 0 : while (!args.empty()) {
1482 [ # # ]: 0 : if (args.front().first != this) break;
1483 : 0 : ancestors_union |= m_depgraph.Ancestors(args.front().second);
1484 : 0 : args = args.subspan(1);
1485 : : }
1486 : 0 : Assume(ancestors_union.Any());
1487 : : // Translate all ancestors (in arbitrary order) to Refs (if they have any), and return them.
1488 [ # # # # ]: 0 : for (auto idx : ancestors_union) {
1489 : 0 : const auto& entry = graph.m_entries[m_mapping[idx]];
1490 : 0 : Assume(entry.m_ref != nullptr);
1491 : 0 : output.push_back(entry.m_ref);
1492 : : }
1493 : 0 : }
1494 : :
1495 : 0 : void Cluster::GetDescendantRefs(const TxGraphImpl& graph, std::span<std::pair<Cluster*, DepGraphIndex>>& args, std::vector<TxGraph::Ref*>& output) noexcept
1496 : : {
1497 : : /** The union of all descendants to be returned. */
1498 : 0 : SetType descendants_union;
1499 : : // Process elements from the front of args, as long as they apply.
1500 [ # # ]: 0 : while (!args.empty()) {
1501 [ # # ]: 0 : if (args.front().first != this) break;
1502 : 0 : descendants_union |= m_depgraph.Descendants(args.front().second);
1503 : 0 : args = args.subspan(1);
1504 : : }
1505 : 0 : Assume(descendants_union.Any());
1506 : : // Translate all descendants (in arbitrary order) to Refs (if they have any), and return them.
1507 [ # # # # ]: 0 : for (auto idx : descendants_union) {
1508 : 0 : const auto& entry = graph.m_entries[m_mapping[idx]];
1509 : 0 : Assume(entry.m_ref != nullptr);
1510 : 0 : output.push_back(entry.m_ref);
1511 : : }
1512 : 0 : }
1513 : :
1514 : 0 : std::vector<TxGraph::Ref*> Cluster::GetClusterRefs(const TxGraphImpl& graph) noexcept
1515 : : {
1516 : 0 : std::vector<TxGraph::Ref*> ret;
1517 : 0 : ret.reserve(m_linearization.size());
1518 : : // Translate all transactions in the Cluster (in linearization order) to Refs.
1519 [ # # ]: 0 : for (auto idx : m_linearization) {
1520 : 0 : const auto& entry = graph.m_entries[m_mapping[idx]];
1521 : 0 : Assume(entry.m_ref != nullptr);
1522 : 0 : ret.push_back(entry.m_ref);
1523 : : }
1524 : 0 : return ret;
1525 : : }
1526 : :
1527 : 0 : FeePerWeight Cluster::GetIndividualFeerate(DepGraphIndex idx) noexcept
1528 : : {
1529 : 0 : return FeePerWeight::FromFeeFrac(m_depgraph.FeeRate(idx));
1530 : : }
1531 : :
1532 : 0 : void Cluster::MakeStagingTransactionsMissing(TxGraphImpl& graph) noexcept
1533 : : {
1534 : 0 : Assume(m_level == 1);
1535 : : // Mark all transactions of a Cluster missing, needed when aborting staging, so that the
1536 : : // corresponding Locators don't retain references into aborted Clusters.
1537 [ # # ]: 0 : for (auto ci : m_linearization) {
1538 : 0 : GraphIndex idx = m_mapping[ci];
1539 : 0 : auto& entry = graph.m_entries[idx];
1540 : 0 : entry.m_locator[1].SetMissing();
1541 : : }
1542 : 0 : }
1543 : :
1544 : 0 : std::vector<TxGraph::Ref*> TxGraphImpl::GetAncestors(const Ref& arg, bool main_only) noexcept
1545 : : {
1546 : : // Return the empty vector if the Ref is empty.
1547 [ # # ]: 0 : if (GetRefGraph(arg) == nullptr) return {};
1548 : 0 : Assume(GetRefGraph(arg) == this);
1549 : : // Apply all removals and dependencies, as the result might be incorrect otherwise.
1550 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1551 : 0 : ApplyDependencies(level);
1552 : : // Ancestry cannot be known if unapplied dependencies remain.
1553 : 0 : Assume(GetClusterSet(level).m_deps_to_add.empty());
1554 : : // Find the Cluster the argument is in, and return the empty vector if it isn't in any.
1555 : 0 : auto cluster = FindCluster(GetRefIndex(arg), level);
1556 [ # # ]: 0 : if (cluster == nullptr) return {};
1557 : : // Dispatch to the Cluster.
1558 : 0 : std::pair<Cluster*, DepGraphIndex> match = {cluster, m_entries[GetRefIndex(arg)].m_locator[cluster->m_level].index};
1559 : 0 : auto matches = std::span(&match, 1);
1560 : 0 : std::vector<TxGraph::Ref*> ret;
1561 : 0 : cluster->GetAncestorRefs(*this, matches, ret);
1562 : 0 : return ret;
1563 : 0 : }
1564 : :
1565 : 0 : std::vector<TxGraph::Ref*> TxGraphImpl::GetDescendants(const Ref& arg, bool main_only) noexcept
1566 : : {
1567 : : // Return the empty vector if the Ref is empty.
1568 [ # # ]: 0 : if (GetRefGraph(arg) == nullptr) return {};
1569 : 0 : Assume(GetRefGraph(arg) == this);
1570 : : // Apply all removals and dependencies, as the result might be incorrect otherwise.
1571 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1572 : 0 : ApplyDependencies(level);
1573 : : // Ancestry cannot be known if unapplied dependencies remain.
1574 : 0 : Assume(GetClusterSet(level).m_deps_to_add.empty());
1575 : : // Find the Cluster the argument is in, and return the empty vector if it isn't in any.
1576 : 0 : auto cluster = FindCluster(GetRefIndex(arg), level);
1577 [ # # ]: 0 : if (cluster == nullptr) return {};
1578 : : // Dispatch to the Cluster.
1579 : 0 : std::pair<Cluster*, DepGraphIndex> match = {cluster, m_entries[GetRefIndex(arg)].m_locator[cluster->m_level].index};
1580 : 0 : auto matches = std::span(&match, 1);
1581 : 0 : std::vector<TxGraph::Ref*> ret;
1582 : 0 : cluster->GetDescendantRefs(*this, matches, ret);
1583 : 0 : return ret;
1584 : 0 : }
1585 : :
1586 : 0 : std::vector<TxGraph::Ref*> TxGraphImpl::GetAncestorsUnion(std::span<const Ref* const> args, bool main_only) noexcept
1587 : : {
1588 : : // Apply all dependencies, as the result might be incorrect otherwise.
1589 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1590 : 0 : ApplyDependencies(level);
1591 : : // Ancestry cannot be known if unapplied dependencies remain.
1592 : 0 : Assume(GetClusterSet(level).m_deps_to_add.empty());
1593 : :
1594 : : // Translate args to matches.
1595 : 0 : std::vector<std::pair<Cluster*, DepGraphIndex>> matches;
1596 : 0 : matches.reserve(args.size());
1597 [ # # ]: 0 : for (auto arg : args) {
1598 : 0 : Assume(arg);
1599 : : // Skip empty Refs.
1600 [ # # ]: 0 : if (GetRefGraph(*arg) == nullptr) continue;
1601 : 0 : Assume(GetRefGraph(*arg) == this);
1602 : : // Find the Cluster the argument is in, and skip if none is found.
1603 : 0 : auto cluster = FindCluster(GetRefIndex(*arg), level);
1604 [ # # ]: 0 : if (cluster == nullptr) continue;
1605 : : // Append to matches.
1606 : 0 : matches.emplace_back(cluster, m_entries[GetRefIndex(*arg)].m_locator[cluster->m_level].index);
1607 : : }
1608 : : // Group by Cluster.
1609 [ # # # # : 0 : std::sort(matches.begin(), matches.end(), [](auto& a, auto& b) noexcept { return std::less{}(a.first, b.first); });
# # # # #
# # # # #
# # # # #
# # # #
# ]
1610 : : // Dispatch to the Clusters.
1611 : 0 : std::span match_span(matches);
1612 : 0 : std::vector<TxGraph::Ref*> ret;
1613 [ # # ]: 0 : while (!match_span.empty()) {
1614 : 0 : match_span.front().first->GetAncestorRefs(*this, match_span, ret);
1615 : : }
1616 : 0 : return ret;
1617 : 0 : }
1618 : :
1619 : 0 : std::vector<TxGraph::Ref*> TxGraphImpl::GetDescendantsUnion(std::span<const Ref* const> args, bool main_only) noexcept
1620 : : {
1621 : : // Apply all dependencies, as the result might be incorrect otherwise.
1622 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1623 : 0 : ApplyDependencies(level);
1624 : : // Ancestry cannot be known if unapplied dependencies remain.
1625 : 0 : Assume(GetClusterSet(level).m_deps_to_add.empty());
1626 : :
1627 : : // Translate args to matches.
1628 : 0 : std::vector<std::pair<Cluster*, DepGraphIndex>> matches;
1629 : 0 : matches.reserve(args.size());
1630 [ # # ]: 0 : for (auto arg : args) {
1631 : 0 : Assume(arg);
1632 : : // Skip empty Refs.
1633 [ # # ]: 0 : if (GetRefGraph(*arg) == nullptr) continue;
1634 : 0 : Assume(GetRefGraph(*arg) == this);
1635 : : // Find the Cluster the argument is in, and skip if none is found.
1636 : 0 : auto cluster = FindCluster(GetRefIndex(*arg), level);
1637 [ # # ]: 0 : if (cluster == nullptr) continue;
1638 : : // Append to matches.
1639 : 0 : matches.emplace_back(cluster, m_entries[GetRefIndex(*arg)].m_locator[cluster->m_level].index);
1640 : : }
1641 : : // Group by Cluster.
1642 [ # # # # : 0 : std::sort(matches.begin(), matches.end(), [](auto& a, auto& b) noexcept { return std::less{}(a.first, b.first); });
# # # # #
# # # # #
# # # # #
# # # #
# ]
1643 : : // Dispatch to the Clusters.
1644 : 0 : std::span match_span(matches);
1645 : 0 : std::vector<TxGraph::Ref*> ret;
1646 [ # # ]: 0 : while (!match_span.empty()) {
1647 : 0 : match_span.front().first->GetDescendantRefs(*this, match_span, ret);
1648 : : }
1649 : 0 : return ret;
1650 : 0 : }
1651 : :
1652 : 0 : std::vector<TxGraph::Ref*> TxGraphImpl::GetCluster(const Ref& arg, bool main_only) noexcept
1653 : : {
1654 : : // Return the empty vector if the Ref is empty (which may be indicative of the transaction
1655 : : // having been removed already.
1656 [ # # ]: 0 : if (GetRefGraph(arg) == nullptr) return {};
1657 : 0 : Assume(GetRefGraph(arg) == this);
1658 : : // Apply all removals and dependencies, as the result might be incorrect otherwise.
1659 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1660 : 0 : ApplyDependencies(level);
1661 : : // Cluster linearization cannot be known if unapplied dependencies remain.
1662 : 0 : Assume(GetClusterSet(level).m_deps_to_add.empty());
1663 : : // Find the Cluster the argument is in, and return the empty vector if it isn't in any.
1664 : 0 : auto cluster = FindCluster(GetRefIndex(arg), level);
1665 [ # # ]: 0 : if (cluster == nullptr) return {};
1666 : : // Make sure the Cluster has an acceptable quality level, and then dispatch to it.
1667 : 0 : MakeAcceptable(*cluster);
1668 : 0 : return cluster->GetClusterRefs(*this);
1669 : : }
1670 : :
1671 : 0 : TxGraph::GraphIndex TxGraphImpl::GetTransactionCount(bool main_only) noexcept
1672 : : {
1673 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1674 : 0 : ApplyRemovals(level);
1675 : 0 : return GetClusterSet(level).m_txcount;
1676 : : }
1677 : :
1678 : 0 : FeePerWeight TxGraphImpl::GetIndividualFeerate(const Ref& arg) noexcept
1679 : : {
1680 : : // Return the empty FeePerWeight if the passed Ref is empty.
1681 [ # # ]: 0 : if (GetRefGraph(arg) == nullptr) return {};
1682 : 0 : Assume(GetRefGraph(arg) == this);
1683 : : // Find the cluster the argument is in (the level does not matter as individual feerates will
1684 : : // be identical if it occurs in both), and return the empty FeePerWeight if it isn't in any.
1685 : 0 : Cluster* cluster{nullptr};
1686 [ # # ]: 0 : for (int level = 0; level <= GetTopLevel(); ++level) {
1687 : : // Apply removals, so that we can correctly report FeePerWeight{} for non-existing
1688 : : // transactions.
1689 : 0 : ApplyRemovals(level);
1690 [ # # ]: 0 : if (m_entries[GetRefIndex(arg)].m_locator[level].IsPresent()) {
1691 : : cluster = m_entries[GetRefIndex(arg)].m_locator[level].cluster;
1692 : : break;
1693 : : }
1694 : : }
1695 [ # # ]: 0 : if (cluster == nullptr) return {};
1696 : : // Dispatch to the Cluster.
1697 : 0 : return cluster->GetIndividualFeerate(m_entries[GetRefIndex(arg)].m_locator[cluster->m_level].index);
1698 : : }
1699 : :
1700 : 0 : FeePerWeight TxGraphImpl::GetMainChunkFeerate(const Ref& arg) noexcept
1701 : : {
1702 : : // Return the empty FeePerWeight if the passed Ref is empty.
1703 [ # # ]: 0 : if (GetRefGraph(arg) == nullptr) return {};
1704 : 0 : Assume(GetRefGraph(arg) == this);
1705 : : // Apply all removals and dependencies, as the result might be inaccurate otherwise.
1706 : 0 : ApplyDependencies(/*level=*/0);
1707 : : // Chunk feerates cannot be accurately known if unapplied dependencies remain.
1708 : 0 : Assume(m_main_clusterset.m_deps_to_add.empty());
1709 : : // Find the cluster the argument is in, and return the empty FeePerWeight if it isn't in any.
1710 : 0 : auto cluster = FindCluster(GetRefIndex(arg), 0);
1711 [ # # ]: 0 : if (cluster == nullptr) return {};
1712 : : // Make sure the Cluster has an acceptable quality level, and then return the transaction's
1713 : : // chunk feerate.
1714 : 0 : MakeAcceptable(*cluster);
1715 : 0 : const auto& entry = m_entries[GetRefIndex(arg)];
1716 : 0 : return entry.m_main_chunk_feerate;
1717 : : }
1718 : :
1719 : 0 : bool TxGraphImpl::IsOversized(bool main_only) noexcept
1720 : : {
1721 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1722 : 0 : auto& clusterset = GetClusterSet(level);
1723 [ # # ]: 0 : if (clusterset.m_oversized.has_value()) {
1724 : : // Return cached value if known.
1725 : 0 : return *clusterset.m_oversized;
1726 : : }
1727 : : // Find which Clusters will need to be merged together, as that is where the oversize
1728 : : // property is assessed.
1729 : 0 : GroupClusters(level);
1730 : 0 : Assume(clusterset.m_group_data.has_value());
1731 : 0 : clusterset.m_oversized = clusterset.m_group_data->m_group_oversized;
1732 : 0 : return *clusterset.m_oversized;
1733 : : }
1734 : :
1735 : 0 : void TxGraphImpl::StartStaging() noexcept
1736 : : {
1737 : : // Staging cannot already exist.
1738 : 0 : Assume(!m_staging_clusterset.has_value());
1739 : : // Apply all remaining dependencies in main before creating a staging graph. Once staging
1740 : : // exists, we cannot merge Clusters anymore (because of interference with Clusters being
1741 : : // pulled into staging), so to make sure all inspectors are available (if not oversized), do
1742 : : // all merging work now. Call SplitAll() first, so that even if ApplyDependencies does not do
1743 : : // any thing due to knowing the result is oversized, splitting is still performed.
1744 : 0 : SplitAll(0);
1745 : 0 : ApplyDependencies(0);
1746 : : // Construct the staging ClusterSet.
1747 : 0 : m_staging_clusterset.emplace();
1748 : : // Copy statistics, precomputed data, and to-be-applied dependencies (only if oversized) to
1749 : : // the new graph. To-be-applied removals will always be empty at this point.
1750 : 0 : m_staging_clusterset->m_txcount = m_main_clusterset.m_txcount;
1751 : 0 : m_staging_clusterset->m_deps_to_add = m_main_clusterset.m_deps_to_add;
1752 : 0 : m_staging_clusterset->m_group_data = m_main_clusterset.m_group_data;
1753 : 0 : m_staging_clusterset->m_oversized = m_main_clusterset.m_oversized;
1754 : 0 : Assume(m_staging_clusterset->m_oversized.has_value());
1755 : 0 : }
1756 : :
1757 : 0 : void TxGraphImpl::AbortStaging() noexcept
1758 : : {
1759 : : // Staging must exist.
1760 : 0 : Assume(m_staging_clusterset.has_value());
1761 : : // Mark all removed transactions as Missing (so the staging locator for these transactions
1762 : : // can be reused if another staging is created).
1763 [ # # ]: 0 : for (auto idx : m_staging_clusterset->m_removed) {
1764 : 0 : m_entries[idx].m_locator[1].SetMissing();
1765 : : }
1766 : : // Do the same with the non-removed transactions in staging Clusters.
1767 [ # # ]: 0 : for (int quality = 0; quality < int(QualityLevel::NONE); ++quality) {
1768 [ # # ]: 0 : for (auto& cluster : m_staging_clusterset->m_clusters[quality]) {
1769 : 0 : cluster->MakeStagingTransactionsMissing(*this);
1770 : : }
1771 : : }
1772 : : // Destroy the staging ClusterSet.
1773 : 0 : m_staging_clusterset.reset();
1774 : 0 : Compact();
1775 [ # # ]: 0 : if (!m_main_clusterset.m_group_data.has_value()) {
1776 : : // In case m_oversized in main was kept after a Ref destruction while staging exists, we
1777 : : // need to re-evaluate m_oversized now.
1778 [ # # ]: 0 : m_main_clusterset.m_oversized = std::nullopt;
1779 : : }
1780 : 0 : }
1781 : :
1782 : 0 : void TxGraphImpl::CommitStaging() noexcept
1783 : : {
1784 : : // Staging must exist.
1785 : 0 : Assume(m_staging_clusterset.has_value());
1786 : : // Delete all conflicting Clusters in main, to make place for moving the staging ones
1787 : : // there. All of these have been copied to staging in PullIn().
1788 : 0 : auto conflicts = GetConflicts();
1789 [ # # ]: 0 : for (Cluster* conflict : conflicts) {
1790 : 0 : conflict->Clear(*this);
1791 : 0 : DeleteCluster(*conflict);
1792 : : }
1793 : : // Mark the removed transactions as Missing (so the staging locator for these transactions
1794 : : // can be reused if another staging is created).
1795 [ # # ]: 0 : for (auto idx : m_staging_clusterset->m_removed) {
1796 : 0 : m_entries[idx].m_locator[1].SetMissing();
1797 : : }
1798 : : // Then move all Clusters in staging to main.
1799 [ # # ]: 0 : for (int quality = 0; quality < int(QualityLevel::NONE); ++quality) {
1800 : 0 : auto& stage_sets = m_staging_clusterset->m_clusters[quality];
1801 [ # # ]: 0 : while (!stage_sets.empty()) {
1802 : 0 : stage_sets.back()->MoveToMain(*this);
1803 : : }
1804 : : }
1805 : : // Move all statistics, precomputed data, and to-be-applied removals and dependencies.
1806 : 0 : m_main_clusterset.m_deps_to_add = std::move(m_staging_clusterset->m_deps_to_add);
1807 : 0 : m_main_clusterset.m_to_remove = std::move(m_staging_clusterset->m_to_remove);
1808 : 0 : m_main_clusterset.m_group_data = std::move(m_staging_clusterset->m_group_data);
1809 : 0 : m_main_clusterset.m_oversized = std::move(m_staging_clusterset->m_oversized);
1810 : 0 : m_main_clusterset.m_txcount = std::move(m_staging_clusterset->m_txcount);
1811 : : // Delete the old staging graph, after all its information was moved to main.
1812 : 0 : m_staging_clusterset.reset();
1813 : 0 : Compact();
1814 : 0 : }
1815 : :
1816 : 0 : void Cluster::SetFee(TxGraphImpl& graph, DepGraphIndex idx, int64_t fee) noexcept
1817 : : {
1818 : : // Make sure the specified DepGraphIndex exists in this Cluster.
1819 : 0 : Assume(m_depgraph.Positions()[idx]);
1820 : : // Bail out if the fee isn't actually being changed.
1821 [ # # ]: 0 : if (m_depgraph.FeeRate(idx).fee == fee) return;
1822 : : // Update the fee, remember that relinearization will be necessary, and update the Entries
1823 : : // in the same Cluster.
1824 [ # # ]: 0 : m_depgraph.FeeRate(idx).fee = fee;
1825 [ # # ]: 0 : if (!NeedsSplitting()) {
1826 : 0 : graph.SetClusterQuality(m_level, m_quality, m_setindex, QualityLevel::NEEDS_RELINEARIZE);
1827 : : } else {
1828 : 0 : graph.SetClusterQuality(m_level, m_quality, m_setindex, QualityLevel::NEEDS_SPLIT);
1829 : : }
1830 : 0 : Updated(graph);
1831 : : }
1832 : :
1833 : 0 : void TxGraphImpl::SetTransactionFee(const Ref& ref, int64_t fee) noexcept
1834 : : {
1835 : : // Don't do anything if the passed Ref is empty.
1836 [ # # ]: 0 : if (GetRefGraph(ref) == nullptr) return;
1837 : 0 : Assume(GetRefGraph(ref) == this);
1838 : : // Find the entry, its locator, and inform its Cluster about the new feerate, if any.
1839 : 0 : auto& entry = m_entries[GetRefIndex(ref)];
1840 [ # # ]: 0 : for (int level = 0; level < MAX_LEVELS; ++level) {
1841 : 0 : auto& locator = entry.m_locator[level];
1842 [ # # ]: 0 : if (locator.IsPresent()) {
1843 : 0 : locator.cluster->SetFee(*this, locator.index, fee);
1844 : : }
1845 : : }
1846 : : }
1847 : :
1848 : 0 : std::strong_ordering TxGraphImpl::CompareMainOrder(const Ref& a, const Ref& b) noexcept
1849 : : {
1850 : : // The references must not be empty.
1851 : 0 : Assume(GetRefGraph(a) == this);
1852 : 0 : Assume(GetRefGraph(b) == this);
1853 : : // Apply dependencies in main.
1854 : 0 : ApplyDependencies(0);
1855 : 0 : Assume(m_main_clusterset.m_deps_to_add.empty());
1856 : : // Make both involved Clusters acceptable, so chunk feerates are relevant.
1857 : 0 : const auto& entry_a = m_entries[GetRefIndex(a)];
1858 : 0 : const auto& entry_b = m_entries[GetRefIndex(b)];
1859 : 0 : const auto& locator_a = entry_a.m_locator[0];
1860 : 0 : const auto& locator_b = entry_b.m_locator[0];
1861 : 0 : Assume(locator_a.IsPresent());
1862 : 0 : Assume(locator_b.IsPresent());
1863 : 0 : MakeAcceptable(*locator_a.cluster);
1864 : 0 : MakeAcceptable(*locator_b.cluster);
1865 : : // Compare chunk feerates, and return result if it differs.
1866 : 0 : auto feerate_cmp = FeeRateCompare(entry_b.m_main_chunk_feerate, entry_a.m_main_chunk_feerate);
1867 [ # # ]: 0 : if (feerate_cmp < 0) return std::strong_ordering::less;
1868 [ # # ]: 0 : if (feerate_cmp > 0) return std::strong_ordering::greater;
1869 : : // Compare Cluster* as tie-break for equal chunk feerates.
1870 [ # # # # ]: 0 : if (locator_a.cluster != locator_b.cluster) return locator_a.cluster <=> locator_b.cluster;
1871 : : // As final tie-break, compare position within cluster linearization.
1872 [ # # # # ]: 0 : return entry_a.m_main_lin_index <=> entry_b.m_main_lin_index;
1873 : : }
1874 : :
1875 : 0 : TxGraph::GraphIndex TxGraphImpl::CountDistinctClusters(std::span<const Ref* const> refs, bool main_only) noexcept
1876 : : {
1877 [ # # ]: 0 : size_t level = GetSpecifiedLevel(main_only);
1878 : 0 : ApplyDependencies(level);
1879 : 0 : auto& clusterset = GetClusterSet(level);
1880 : 0 : Assume(clusterset.m_deps_to_add.empty());
1881 : : // Build a vector of Clusters that the specified Refs occur in.
1882 : 0 : std::vector<Cluster*> clusters;
1883 : 0 : clusters.reserve(refs.size());
1884 [ # # ]: 0 : for (const Ref* ref : refs) {
1885 : 0 : Assume(ref);
1886 [ # # ]: 0 : if (GetRefGraph(*ref) == nullptr) continue;
1887 : 0 : Assume(GetRefGraph(*ref) == this);
1888 : 0 : auto cluster = FindCluster(GetRefIndex(*ref), level);
1889 [ # # ]: 0 : if (cluster != nullptr) clusters.push_back(cluster);
1890 : : }
1891 : : // Count the number of distinct elements in clusters.
1892 : 0 : std::sort(clusters.begin(), clusters.end());
1893 : 0 : Cluster* last{nullptr};
1894 : 0 : GraphIndex ret{0};
1895 [ # # ]: 0 : for (Cluster* cluster : clusters) {
1896 : 0 : ret += (cluster != last);
1897 : 0 : last = cluster;
1898 : : }
1899 : 0 : return ret;
1900 : 0 : }
1901 : :
1902 : 0 : void Cluster::SanityCheck(const TxGraphImpl& graph, int level) const
1903 : : {
1904 : : // There must be an m_mapping for each m_depgraph position (including holes).
1905 [ # # ]: 0 : assert(m_depgraph.PositionRange() == m_mapping.size());
1906 : : // The linearization for this Cluster must contain every transaction once.
1907 [ # # ]: 0 : assert(m_depgraph.TxCount() == m_linearization.size());
1908 : : // The number of transactions in a Cluster cannot exceed m_max_cluster_count.
1909 [ # # ]: 0 : assert(m_linearization.size() <= graph.m_max_cluster_count);
1910 : : // The level must match the level the Cluster occurs in.
1911 [ # # ]: 0 : assert(m_level == level);
1912 : : // m_quality and m_setindex are checked in TxGraphImpl::SanityCheck.
1913 : :
1914 : : // Compute the chunking of m_linearization.
1915 : 0 : LinearizationChunking linchunking(m_depgraph, m_linearization);
1916 : :
1917 : : // Verify m_linearization.
1918 : 0 : SetType m_done;
1919 : 0 : LinearizationIndex linindex{0};
1920 [ # # ]: 0 : assert(m_depgraph.IsAcyclic());
1921 [ # # ]: 0 : for (auto lin_pos : m_linearization) {
1922 [ # # ]: 0 : assert(lin_pos < m_mapping.size());
1923 : 0 : const auto& entry = graph.m_entries[m_mapping[lin_pos]];
1924 : : // Check that the linearization is topological.
1925 : 0 : m_done.Set(lin_pos);
1926 [ # # ]: 0 : assert(m_done.IsSupersetOf(m_depgraph.Ancestors(lin_pos)));
1927 : : // Check that the Entry has a locator pointing back to this Cluster & position within it.
1928 [ # # ]: 0 : assert(entry.m_locator[level].cluster == this);
1929 [ # # ]: 0 : assert(entry.m_locator[level].index == lin_pos);
1930 : : // For main-level entries, check linearization position and chunk feerate.
1931 [ # # ]: 0 : if (level == 0 && IsAcceptable()) {
1932 [ # # ]: 0 : assert(entry.m_main_lin_index == linindex);
1933 : 0 : ++linindex;
1934 [ # # ]: 0 : if (!linchunking.GetChunk(0).transactions[lin_pos]) {
1935 : 0 : linchunking.MarkDone(linchunking.GetChunk(0).transactions);
1936 : : }
1937 [ # # ]: 0 : assert(entry.m_main_chunk_feerate == linchunking.GetChunk(0).feerate);
1938 : : // If this Cluster has an acceptable quality level, its chunks must be connected.
1939 [ # # ]: 0 : assert(m_depgraph.IsConnected(linchunking.GetChunk(0).transactions));
1940 : : }
1941 : : }
1942 : : // Verify that each element of m_depgraph occurred in m_linearization.
1943 [ # # ]: 0 : assert(m_done == m_depgraph.Positions());
1944 : 0 : }
1945 : :
1946 : 0 : void TxGraphImpl::SanityCheck() const
1947 : : {
1948 : : /** Which GraphIndexes ought to occur in m_unlinked, based on m_entries. */
1949 : 0 : std::set<GraphIndex> expected_unlinked;
1950 : : /** Which Clusters ought to occur in ClusterSet::m_clusters, based on m_entries. */
1951 [ # # ]: 0 : std::set<const Cluster*> expected_clusters[MAX_LEVELS];
1952 : : /** Which GraphIndexes ought to occur in ClusterSet::m_removed, based on m_entries. */
1953 [ # # ]: 0 : std::set<GraphIndex> expected_removed[MAX_LEVELS];
1954 : : /** Whether compaction is possible in the current state. */
1955 : 0 : bool compact_possible{true};
1956 : :
1957 : : // Go over all Entry objects in m_entries.
1958 [ # # ]: 0 : for (GraphIndex idx = 0; idx < m_entries.size(); ++idx) {
1959 [ # # ]: 0 : const auto& entry = m_entries[idx];
1960 [ # # ]: 0 : if (entry.m_ref == nullptr) {
1961 : : // Unlinked Entry must have indexes appear in m_unlinked.
1962 [ # # ]: 0 : expected_unlinked.insert(idx);
1963 : : } else {
1964 : : // Every non-unlinked Entry must have a Ref that points back to it.
1965 [ # # ]: 0 : assert(GetRefGraph(*entry.m_ref) == this);
1966 [ # # ]: 0 : assert(GetRefIndex(*entry.m_ref) == idx);
1967 : : }
1968 : : // Verify the Entry m_locators.
1969 : : bool was_present{false}, was_removed{false};
1970 [ # # ]: 0 : for (int level = 0; level < MAX_LEVELS; ++level) {
1971 : 0 : const auto& locator = entry.m_locator[level];
1972 : : // Every Locator must be in exactly one of these 3 states.
1973 [ # # # # : 0 : assert(locator.IsMissing() + locator.IsRemoved() + locator.IsPresent() == 1);
# # ]
1974 [ # # ]: 0 : if (locator.IsPresent()) {
1975 : : // Once removed, a transaction cannot be revived.
1976 [ # # ]: 0 : assert(!was_removed);
1977 : : // Verify that the Cluster agrees with where the Locator claims the transaction is.
1978 [ # # ]: 0 : assert(locator.cluster->GetClusterEntry(locator.index) == idx);
1979 : : // Remember that we expect said Cluster to appear in the ClusterSet::m_clusters.
1980 [ # # ]: 0 : expected_clusters[level].insert(locator.cluster);
1981 : : was_present = true;
1982 [ # # ]: 0 : } else if (locator.IsRemoved()) {
1983 : : // Level 0 (main) cannot have IsRemoved locators (IsMissing there means non-existing).
1984 [ # # ]: 0 : assert(level > 0);
1985 : : // A Locator can only be IsRemoved if it was IsPresent before, and only once.
1986 [ # # ]: 0 : assert(was_present && !was_removed);
1987 : : // Remember that we expect this GraphIndex to occur in the ClusterSet::m_removed.
1988 [ # # ]: 0 : expected_removed[level].insert(idx);
1989 : : was_removed = true;
1990 : : }
1991 : : }
1992 : : }
1993 : :
1994 : : // For all levels (0 = main, 1 = staged)...
1995 [ # # ]: 0 : for (int level = 0; level <= GetTopLevel(); ++level) {
1996 : 0 : assert(level < MAX_LEVELS);
1997 : 0 : auto& clusterset = GetClusterSet(level);
1998 : 0 : std::set<const Cluster*> actual_clusters;
1999 : :
2000 : : // For all quality levels...
2001 [ # # ]: 0 : for (int qual = 0; qual < int(QualityLevel::NONE); ++qual) {
2002 : 0 : QualityLevel quality{qual};
2003 : 0 : const auto& quality_clusters = clusterset.m_clusters[qual];
2004 : : // ... for all clusters in them ...
2005 [ # # ]: 0 : for (ClusterSetIndex setindex = 0; setindex < quality_clusters.size(); ++setindex) {
2006 [ # # ]: 0 : const auto& cluster = *quality_clusters[setindex];
2007 : : // Remember we saw this Cluster (only if it is non-empty; empty Clusters aren't
2008 : : // expected to be referenced by the Entry vector).
2009 [ # # ]: 0 : if (cluster.GetTxCount() != 0) {
2010 [ # # ]: 0 : actual_clusters.insert(&cluster);
2011 : : }
2012 : : // Sanity check the cluster, according to the Cluster's internal rules.
2013 : 0 : cluster.SanityCheck(*this, level);
2014 : : // Check that the cluster's quality and setindex matches its position in the quality list.
2015 [ # # ]: 0 : assert(cluster.m_quality == quality);
2016 [ # # ]: 0 : assert(cluster.m_setindex == setindex);
2017 : : }
2018 : : }
2019 : :
2020 : : // Verify that all to-be-removed transactions have valid identifiers.
2021 [ # # ]: 0 : for (GraphIndex idx : clusterset.m_to_remove) {
2022 [ # # ]: 0 : assert(idx < m_entries.size());
2023 : : // We cannot assert that all m_to_remove transactions are still present: ~Ref on a
2024 : : // (P,M) transaction (present in main, inherited in staging) will cause an m_to_remove
2025 : : // addition in both main and staging, but a subsequence ApplyRemovals in main will
2026 : : // cause it to disappear from staging too, leaving the m_to_remove in place.
2027 : : }
2028 : :
2029 : : // Verify that all to-be-added dependencies have valid identifiers.
2030 [ # # # # ]: 0 : for (auto [par_idx, chl_idx] : clusterset.m_deps_to_add) {
2031 [ # # ]: 0 : assert(par_idx != chl_idx);
2032 [ # # ]: 0 : assert(par_idx < m_entries.size());
2033 [ # # ]: 0 : assert(chl_idx < m_entries.size());
2034 : : }
2035 : :
2036 : : // Verify that the actually encountered clusters match the ones occurring in Entry vector.
2037 [ # # ]: 0 : assert(actual_clusters == expected_clusters[level]);
2038 : :
2039 : : // Verify that the contents of m_removed matches what was expected based on the Entry vector.
2040 [ # # ]: 0 : std::set<GraphIndex> actual_removed(clusterset.m_removed.begin(), clusterset.m_removed.end());
2041 [ # # ]: 0 : for (auto i : expected_unlinked) {
2042 : : // If a transaction exists in both main and staging, and is removed from staging (adding
2043 : : // it to m_removed there), and consequently destroyed (wiping the locator completely),
2044 : : // it can remain in m_removed despite not having an IsRemoved() locator. Exclude those
2045 : : // transactions from the comparison here.
2046 : 0 : actual_removed.erase(i);
2047 : 0 : expected_removed[level].erase(i);
2048 : : }
2049 : :
2050 [ # # ]: 0 : assert(actual_removed == expected_removed[level]);
2051 : :
2052 : : // If any GraphIndex entries remain in this ClusterSet, compact is not possible.
2053 [ # # ]: 0 : if (!clusterset.m_deps_to_add.empty()) compact_possible = false;
2054 [ # # ]: 0 : if (!clusterset.m_to_remove.empty()) compact_possible = false;
2055 [ # # ]: 0 : if (!clusterset.m_removed.empty()) compact_possible = false;
2056 : :
2057 : : // If m_group_data exists, its m_group_oversized must match m_oversized.
2058 [ # # ]: 0 : if (clusterset.m_group_data.has_value()) {
2059 [ # # ]: 0 : assert(clusterset.m_oversized == clusterset.m_group_data->m_group_oversized);
2060 : : }
2061 : :
2062 : : // For non-top levels, m_oversized must be known (as it cannot change until the level
2063 : : // on top is gone).
2064 [ # # # # ]: 0 : if (level < GetTopLevel()) assert(clusterset.m_oversized.has_value());
2065 : 0 : }
2066 : :
2067 : : // Verify that the contents of m_unlinked matches what was expected based on the Entry vector.
2068 [ # # ]: 0 : std::set<GraphIndex> actual_unlinked(m_unlinked.begin(), m_unlinked.end());
2069 [ # # ]: 0 : assert(actual_unlinked == expected_unlinked);
2070 : :
2071 : : // If compaction was possible, it should have been performed already, and m_unlinked must be
2072 : : // empty (to prevent memory leaks due to an ever-growing m_entries vector).
2073 [ # # ]: 0 : if (compact_possible) {
2074 [ # # ]: 0 : assert(actual_unlinked.empty());
2075 : : }
2076 [ # # # # : 0 : }
# # # # ]
2077 : :
2078 : 0 : void TxGraphImpl::DoWork() noexcept
2079 : : {
2080 [ # # ]: 0 : for (int level = 0; level <= GetTopLevel(); ++level) {
2081 : 0 : MakeAllAcceptable(level);
2082 : : }
2083 : 0 : }
2084 : :
2085 : : } // namespace
2086 : :
2087 : 0 : TxGraph::Ref::~Ref()
2088 : : {
2089 [ # # ]: 0 : if (m_graph) {
2090 : : // Inform the TxGraph about the Ref being destroyed.
2091 : 0 : m_graph->UnlinkRef(m_index);
2092 : 0 : m_graph = nullptr;
2093 : : }
2094 : 0 : }
2095 : :
2096 : 0 : TxGraph::Ref& TxGraph::Ref::operator=(Ref&& other) noexcept
2097 : : {
2098 : : // Unlink the current graph, if any.
2099 [ # # ]: 0 : if (m_graph) m_graph->UnlinkRef(m_index);
2100 : : // Inform the other's graph about the move, if any.
2101 [ # # ]: 0 : if (other.m_graph) other.m_graph->UpdateRef(other.m_index, *this);
2102 : : // Actually update the contents.
2103 : 0 : m_graph = other.m_graph;
2104 : 0 : m_index = other.m_index;
2105 : 0 : other.m_graph = nullptr;
2106 : 0 : other.m_index = GraphIndex(-1);
2107 : 0 : return *this;
2108 : : }
2109 : :
2110 : 0 : TxGraph::Ref::Ref(Ref&& other) noexcept
2111 : : {
2112 : : // Inform the TxGraph of other that its Ref is being moved.
2113 [ # # ]: 0 : if (other.m_graph) other.m_graph->UpdateRef(other.m_index, *this);
2114 : : // Actually move the contents.
2115 : 0 : std::swap(m_graph, other.m_graph);
2116 : 0 : std::swap(m_index, other.m_index);
2117 : 0 : }
2118 : :
2119 : 0 : std::unique_ptr<TxGraph> MakeTxGraph(unsigned max_cluster_count) noexcept
2120 : : {
2121 [ # # ]: 0 : return std::make_unique<TxGraphImpl>(max_cluster_count);
2122 : : }
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