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Stable release v32.1bitcoin/bitcoin · f0de87f04062 ↗3,020 source files · 47.5 MB stored on the server440 file guides

Release published 2026-10-28 · Snapshot fetched 2026-11-01. Latest stable release at fetch time; development branches and Git history are excluded. Only the selected code window and visible folders load here.

bitcoin / bitcoinstable

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▤ addition_overflow.cpp

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bitcoin / src / test / fuzz / txgraph.cpp

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1001
1002                // Determine an upper bound on how many transactions are removed.
1003                uint32_t max_removed = 0;
1004                for (auto& cluster : clusters) {
1005                    // Gather all transaction sizes in the to-be-combined cluster.
1006                    std::vector<uint32_t> sizes;
1007                    for (auto i : cluster) sizes.push_back(top_sim.graph.FeeRate(i).size);
1008                    auto sum_sizes = std::accumulate(sizes.begin(), sizes.end(), uint64_t{0});
1009                    // Sort from large to small.
1010                    std::ranges::sort(sizes, std::greater{});
1011                    // In the worst case, only the smallest transactions are removed.
1012                    while (sizes.size() > max_cluster_count || sum_sizes > max_cluster_size) {
1013                        sum_sizes -= sizes.back();
1014                        sizes.pop_back();
1015                        ++max_removed;
1016                    }
1017                }
1018
1019                // Invoke Trim now on the definitely-oversized txgraph.
1020                auto removed = real->Trim();
1021                // Verify that the number of removals is within range.
1022                assert(removed.size() >= 1);
1023                assert(removed.size() <= max_removed);
1024                // The removed set must contain all its own descendants.
1025                auto removed_set = top_sim.MakeSet(removed);
1026                for (auto simpos : removed_set) {
1027                    assert(top_sim.graph.Descendants(simpos).IsSubsetOf(removed_set));
1028                }
1029                // Something from every oversized cluster should have been removed, and nothing
1030                // else.
1031                assert(top_sim.MatchesOversizedClusters(removed_set));
1032
1033                // Apply all removals to the simulation, and verify the result is no longer
1034                // oversized. Don't query the real graph for oversizedness; it is compared
1035                // against the simulation anyway later.
1036                for (auto simpos : removed_set) {
1037                    top_sim.RemoveTransaction(top_sim.GetRef(simpos));
1038                }
1039                assert(!top_sim.IsOversized());
1040                break;
1041            } else if (command-- == 0) {
1042                // GetMainMemoryUsage().
1043                auto usage = real->GetMainMemoryUsage();
1044                // Test stability.
1045                if (alt) {
1046                    auto usage2 = real->GetMainMemoryUsage();
1047                    assert(usage == usage2);
1048                }
1049                // Only empty graphs have 0 memory usage.
1050                if (main_sim.GetTransactionCount() == 0) {
1051                    assert(usage == 0);
1052                } else {
1053                    assert(usage > 0);
1054                }
1055                break;
1056            }
1057        }
1058    }
1059
1060    // After running all modifications, perform an internal sanity check (before invoking
1061    // inspectors that may modify the internal state).
1062    real->SanityCheck();
1063
1064    if (!sims[0].IsOversized()) {
1065        // If the main graph is not oversized, verify the total ordering implied by
1066        // CompareMainOrder.
1067        // First construct two distinct randomized permutations of the positions in sims[0].
1068        std::vector<SimTxGraph::Pos> vec1;
1069        for (auto i : sims[0].graph.Positions()) vec1.push_back(i);
1070        std::shuffle(vec1.begin(), vec1.end(), rng);
1071        auto vec2 = vec1;
1072        std::shuffle(vec2.begin(), vec2.end(), rng);
1073        if (vec1 == vec2) std::next_permutation(vec2.begin(), vec2.end());
1074        // Sort both according to CompareMainOrder. By having randomized starting points, the order
1075        // of CompareMainOrder invocations is somewhat randomized as well.
1076        auto cmp = [&](SimTxGraph::Pos a, SimTxGraph::Pos b) noexcept {
1077            return real->CompareMainOrder(*sims[0].GetRef(a), *sims[0].GetRef(b)) < 0;
1078        };
1079        std::ranges::sort(vec1, cmp);
1080        std::ranges::sort(vec2, cmp);
1081
1082        // Verify the resulting orderings are identical. This could only fail if the ordering was
1083        // not total.
1084        assert(vec1 == vec2);
1085
1086        // Verify that the ordering is topological.
1087        auto todo = sims[0].graph.Positions();
1088        for (auto i : vec1) {
1089            todo.Reset(i);
1090            assert(!sims[0].graph.Ancestors(i).Overlaps(todo));
1091        }
1092        assert(todo.None());
1093
1094        // If the real graph claims to be optimal (the last DoWork() call returned true), verify
1095        // that calling Linearize on it does not improve it further.
1096        if (sims[0].real_is_optimal) {
1097            auto real_diagram = ChunkLinearization(sims[0].graph, vec1);
1098            auto fallback_order_sim = [&](DepGraphIndex a, DepGraphIndex b) noexcept {
1099                auto txid_a = sims[0].GetRef(a)->m_txid;
1100                auto txid_b = sims[0].GetRef(b)->m_txid;
1101                return txid_a <=> txid_b;
1102            };
1103            auto [sim_lin, sim_optimal, _cost] = Linearize(sims[0].graph, 300000, rng.rand64(), fallback_order_sim, vec1);
1104            PostLinearize(sims[0].graph, sim_lin);
1105            auto sim_diagram = ChunkLinearization(sims[0].graph, sim_lin);
1106            auto cmp = CompareChunks(real_diagram, sim_diagram);
1107            assert(cmp == 0);
1108
1109            // Verify consistency of cross-cluster chunk ordering with tie-break (equal-feerate
1110            // prefix size).
1111            auto real_chunking = ChunkLinearizationInfo(sims[0].graph, vec1);
1112            /** Map with one entry per component of the sim main graph. Key is the first Pos of the
1113             *  component. Value is the sum of all chunk sizes from that component seen
1114             *  already, at the current chunk feerate. */
1115            std::map<SimTxGraph::Pos, int32_t> comp_prefix_sizes;
1116            /** Current chunk feerate. */
1117            FeeFrac last_chunk_feerate;
1118            /** Largest seen (equal-feerate chunk prefix size, max txid).  */
1119            std::pair<int32_t, uint64_t> max_chunk_tiebreak{0, 0};
1120            for (const auto& chunk : real_chunking) {
1121                // If this is the first chunk with a strictly lower feerate, reset.
1122                if (ByRatio{chunk.feerate} < ByRatio{last_chunk_feerate}) {
1123                    comp_prefix_sizes.clear();
1124                    max_chunk_tiebreak = {0, 0};
1125                }
1126                last_chunk_feerate = chunk.feerate;
1127                // Find which sim component this chunk belongs to.
1128                auto component = sims[0].graph.GetConnectedComponent(sims[0].graph.Positions(), chunk.transactions.First());
1129                assert(chunk.transactions.IsSubsetOf(component));
1130                auto comp_key = component.First();
1131                auto& comp_prefix_size = comp_prefix_sizes[comp_key];
1132                comp_prefix_size += chunk.feerate.size;
1133                // Determine the chunk's max txid.
1134                uint64_t chunk_max_txid{0};
1135                for (auto tx : chunk.transactions) {
1136                    auto txid = sims[0].GetRef(tx)->m_txid;
1137                    chunk_max_txid = std::max(txid, chunk_max_txid);
1138                }
1139                // Verify consistency: within each group of equal-feerate chunks, the
1140                // (equal-feerate chunk prefix size, max txid) must be increasing.
1141                std::pair<int32_t, uint64_t> chunk_tiebreak{comp_prefix_size, chunk_max_txid};
1142                assert(chunk_tiebreak > max_chunk_tiebreak);
1143                max_chunk_tiebreak = chunk_tiebreak;
1144            }
1145
1146            // Verify that within each cluster, the internal ordering matches that of the
1147            // simulation if that is optimal too, since per-cluster optimal orderings are
1148            // deterministic. Note that both have been PostLinearize()'ed.
1149            if (sim_optimal) {
1150                for (const auto& component : sims[0].GetComponents()) {
1151                    std::vector<DepGraphIndex> sim_chunk_lin, real_chunk_lin;
1152                    for (auto i : sim_lin) {
1153                        if (component[i]) sim_chunk_lin.push_back(i);
1154                    }
1155                    for (auto i : vec1) {
1156                        if (component[i]) real_chunk_lin.push_back(i);
1157                    }
1158                    assert(sim_chunk_lin == real_chunk_lin);
1159                }
1160            }
1161
1162            // Verify that a fresh TxGraph, with the same transactions and txids, but constructed
1163            // in a different order, and with a different RNG state, recreates the exact same
1164            // ordering, showing that for optimal graphs, the full mempool ordering is
1165            // deterministic.
1166            auto real_redo = MakeTxGraph(
1167                /*max_cluster_count=*/max_cluster_count,
1168                /*max_cluster_size=*/max_cluster_size,
1169                /*acceptable_cost=*/acceptable_cost,
1170                /*fallback_order=*/fallback_order);
1171            /** Vector (indexed by SimTxGraph::Pos) of TxObjects in real_redo). */
1172            std::vector<std::optional<SimTxObject>> txobjects_redo;
1173            txobjects_redo.resize(sims[0].graph.PositionRange());
1174            // Recreate the graph's transactions with same feerate and txid.
1175            std::vector<DepGraphIndex> positions;
1176            for (auto i : sims[0].graph.Positions()) positions.push_back(i);
1177            std::shuffle(positions.begin(), positions.end(), rng);
1178            for (auto i : positions) {
1179                txobjects_redo[i].emplace(sims[0].GetRef(i)->m_txid);
1180                real_redo->AddTransaction(*txobjects_redo[i], FeePerWeight::FromFeeFrac(sims[0].graph.FeeRate(i)));
1181            }
1182            // Recreate the graph's dependencies.
1183            std::vector<std::pair<DepGraphIndex, DepGraphIndex>> deps;
1184            for (auto i : sims[0].graph.Positions()) {
1185                for (auto j : sims[0].graph.GetReducedParents(i)) {
1186                    deps.emplace_back(j, i);
1187                }
1188            }
1189            std::shuffle(deps.begin(), deps.end(), rng);
1190            for (auto [parent, child] : deps) {
1191                real_redo->AddDependency(*txobjects_redo[parent], *txobjects_redo[child]);
1192            }
1193            // Do work to reach optimality.
1194            if (real_redo->DoWork(300000)) {
1195                // Start from a random permutation.
1196                auto vec_redo = vec1;
1197                std::shuffle(vec_redo.begin(), vec_redo.end(), rng);
1198                if (vec_redo == vec1) std::next_permutation(vec_redo.begin(), vec_redo.end());
1199                // Sort it according to the main graph order in real_redo.
1200                auto cmp_redo = [&](SimTxGraph::Pos a, SimTxGraph::Pos b) noexcept {
1201                    return real_redo->CompareMainOrder(*txobjects_redo[a], *txobjects_redo[b]) < 0;
1202                };
1203                std::ranges::sort(vec_redo, cmp_redo);
1204                // Compare with the ordering we got from real.
1205                assert(vec1 == vec_redo);
1206            }
1207        }
1208
1209        // For every transaction in the total ordering, find a random one before it and after it,
1210        // and compare their chunk feerates, which must be consistent with the ordering.
1211        for (size_t pos = 0; pos < vec1.size(); ++pos) {
1212            auto pos_feerate = real->GetMainChunkFeerate(*sims[0].GetRef(vec1[pos]));
1213            if (pos > 0) {
1214                size_t before = rng.randrange<size_t>(pos);
1215                auto before_feerate = real->GetMainChunkFeerate(*sims[0].GetRef(vec1[before]));
1216                assert(ByRatio{before_feerate} >= ByRatio{pos_feerate});
1217            }
1218            if (pos + 1 < vec1.size()) {
1219                size_t after = pos + 1 + rng.randrange<size_t>(vec1.size() - 1 - pos);
1220                auto after_feerate = real->GetMainChunkFeerate(*sims[0].GetRef(vec1[after]));
1221                assert(ByRatio{after_feerate} <= ByRatio{pos_feerate});
1222            }
1223        }
1224
1225        // The same order should be obtained through a BlockBuilder as implied by CompareMainOrder,
1226        // if nothing is skipped.
1227        auto builder = real->GetBlockBuilder();
1228        std::vector<SimTxGraph::Pos> vec_builder;
1229        std::vector<TxGraph::Ref*> last_chunk;
1230        FeePerWeight last_chunk_feerate;
1231        while (auto chunk = builder->GetCurrentChunk()) {
1232            FeePerWeight sum;
1233            for (TxGraph::Ref* ref : chunk->first) {
1234                // The reported chunk feerate must match the chunk feerate obtained by asking
1235                // it for each of the chunk's transactions individually.
1236                assert(real->GetMainChunkFeerate(*ref) == chunk->second);
1237                // Verify the chunk feerate matches the sum of the reported individual feerates.
1238                sum += real->GetIndividualFeerate(*ref);
1239                // Chunks must contain transactions that exist in the graph.
1240                auto simpos = sims[0].Find(ref);
1241                assert(simpos != SimTxGraph::MISSING);
1242                vec_builder.push_back(simpos);
1243            }
1244            assert(sum == chunk->second);
1245            last_chunk = std::move(chunk->first);
1246            last_chunk_feerate = chunk->second;
1247            builder->Include();
1248        }
1249        assert(vec_builder == vec1);
1250

A READING COMPANION

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440 guided files · 2,580 pending. Guides cover key sections, not every line.

cmake/bitcoin-build-config.h.in src/consensus/amount.h src/consensus/consensus.h src/primitives/block.h src/primitives/transaction.h src/crypto/sha256.h src/util/moneystr.h src/clientversion.h src/uint256.h src/script/script.h src/policy/policy.h CMakeLists.txt README.md COPYING src/consensus/tx_check.cpp src/consensus/tx_verify.cpp src/consensus/merkle.cpp src/pow.cpp src/validation.cpp src/script/interpreter.cpp src/script/solver.cpp src/script/sign.cpp src/key_io.cpp src/net.cpp src/net_processing.cpp src/netaddress.cpp src/protocol.h src/wallet/wallet.cpp src/wallet/spend.cpp

← Previous 250 linesCode page 5Next 250 lines →

src/wallet/receive.cpp

src/wallet/coinselection.cpp

src/consensus/validation.h

src/primitives/transaction.cpp

src/script/descriptor.cpp

src/bitcoin-cli.cpp

src/rpc/blockchain.cpp

src/rpc/rawtransaction.cpp

src/init.cpp

src/crypto/sha256.cpp

src/consensus/merkle.h

src/consensus/tx_check.h

src/consensus/tx_verify.h

src/policy/feerate.h

src/policy/feerate.cpp

src/primitives/transaction_identifier.h

src/chainparamsbase.h

src/chainparamsbase.cpp

src/util/moneystr.cpp

src/crypto/ripemd160.h

src/crypto/sha1.h

src/crypto/sha512.h

src/crypto/hmac_sha256.h

src/crypto/hmac_sha512.h

src/crypto/hmac_sha256.cpp

src/crypto/hmac_sha512.cpp

src/crypto/hkdf_sha256_32.h

src/crypto/hkdf_sha256_32.cpp

src/support/cleanse.h

src/support/cleanse.cpp

src/crypto/siphash.cpp

src/crypto/muhash.h

src/crypto/chacha20.h

src/crypto/poly1305.h

src/crypto/chacha20poly1305.h

src/crypto/chacha20poly1305.cpp

src/util/chaintype.cpp

src/util/obfuscation.h

src/util/byte_units.h

src/util/overflow.h

src/blockencodings.cpp

src/net_permissions.cpp

src/policy/packages.cpp

src/policy/rbf.cpp

src/policy/truc_policy.cpp

src/policy/ephemeral_policy.cpp

src/policy/settings.cpp

src/policy/policy.cpp

src/node/transaction.cpp

src/node/coin.cpp

src/rpc/client.cpp

src/rpc/external_signer.cpp

src/rpc/request.cpp

src/rpc/server_util.cpp

src/rpc/fees.cpp

src/rpc/output_script.cpp

src/rpc/rawtransaction_util.cpp

src/rpc/rawtransaction_util.h

src/rpc/register.h

src/rpc/request.h

src/rpc/server_util.h

src/rpc/protocol.h

src/rpc/server.h

src/rpc/signmessage.cpp

src/rpc/txoutproof.cpp

src/rpc/util.cpp

src/rpc/util.h

src/wallet/rpc/addresses.cpp

src/wallet/rpc/backup.cpp

src/wallet/rpc/coins.cpp

src/wallet/rpc/encrypt.cpp

src/wallet/rpc/signmessage.cpp

src/wallet/rpc/util.cpp

src/wallet/rpc/util.h

src/wallet/coincontrol.cpp

src/wallet/coincontrol.h

src/wallet/context.cpp

src/wallet/context.h

src/wallet/crypter.cpp

src/wallet/crypter.h

src/wallet/db.cpp

src/wallet/export.cpp

src/wallet/external_signer_scriptpubkeyman.cpp

src/wallet/rpc/spend.cpp

src/wallet/rpc/transactions.cpp

src/wallet/rpc/wallet.cpp

src/wallet/feebumper.cpp

src/wallet/feebumper.h

src/index/base.h

src/index/base.cpp

src/index/txindex.h

src/index/txindex.cpp

src/index/txindex_key.h

src/index/txospenderindex.h

src/index/txospenderindex.cpp

src/index/blockfilterindex.h

src/index/blockfilterindex.cpp

src/index/coinstatsindex.h

src/index/coinstatsindex.cpp

src/index/db_key.h

src/index/disktxpos.h

src/kernel/chain.cpp

src/kernel/chain.h

src/kernel/checks.cpp

src/kernel/checks.h

src/kernel/context.cpp

src/kernel/context.h

src/kernel/cs_main.cpp

src/kernel/cs_main.h

src/kernel/disconnected_transactions.cpp

src/kernel/disconnected_transactions.h

src/kernel/mempool_removal_reason.cpp

src/kernel/mempool_removal_reason.h

src/kernel/coinstats.cpp

src/kernel/coinstats.h

src/kernel/chainparams.cpp

src/kernel/chainparams.h

src/wallet/sqlite.cpp

src/wallet/sqlite.h

src/wallet/transaction.cpp

src/wallet/transaction.h

src/wallet/dump.cpp

src/wallet/dump.h

src/wallet/init.cpp

src/wallet/walletutil.cpp

src/wallet/walletutil.h

src/wallet/wallettool.cpp

src/wallet/wallettool.h

src/wallet/export.h

src/wallet/migrate.cpp

src/wallet/migrate.h

src/wallet/db.h

src/wallet/walletdb.cpp

src/wallet/interfaces.cpp

src/wallet/scriptpubkeyman.cpp

src/wallet/scriptpubkeyman.h

src/kernel/bitcoinkernel.cpp

src/kernel/bitcoinkernel.h

src/kernel/bitcoinkernel_wrapper.h

src/node/chainstate.cpp

src/node/chainstate.h

src/node/blockstorage.cpp

src/node/blockstorage.h

src/node/mempool_persist.cpp

src/node/mempool_persist.h

src/node/utxo_snapshot.cpp

src/node/utxo_snapshot.h

src/node/kernel_notifications.cpp

src/node/kernel_notifications.h

src/node/blockmanager_args.cpp

src/kernel/blockmanager_opts.h

src/util/expected.cpp

src/policy/settings.h

src/util/types.h

src/kernel/messagestartchars.h

src/kernel/warning.h

src/util/exception.h

src/common/license_info.h

src/node/coins_view_args.h

src/node/database_args.h

src/util/batchpriority.h

src/util/ui_change_type.h

src/node/coins_view_args.cpp

src/node/peerman_args.h

src/util/serfloat.h

src/node/blockmanager_args.h

src/node/database_args.cpp

src/util/overloaded.h

src/interfaces/types.h

src/node/chainstatemanager_args.h

src/node/minisketchwrapper.h

src/util/macros.h

src/util/syserror.h

src/common/run_command.h

src/util/bytevectorhash.cpp

src/node/mempool_persist_args.cpp

src/util/exec.h

src/util/rbf.h

src/crypto/hex_base.h

src/node/mempool_persist_args.h

src/interfaces/echo.h

src/util/any.h

src/util/batchpriority.cpp

src/util/threadnames.h

src/node/coin.h

src/node/mempool_args.h

src/util/asmap.h

src/util/bytevectorhash.h

src/node/context.cpp

src/util/insert.h

src/util/readwritefile.h

src/node/peerman_args.cpp

src/node/interface_ui.cpp

src/interfaces/handler.h

src/node/mining_args.h

src/util/hasher.cpp

src/common/init.h

src/kernel/mempool_limits.h

src/common/system.h

src/crypto/sha3.h

src/util/threadinterrupt.cpp

src/node/protocol_version.h

src/util/exception.cpp

src/common/messages.h

src/node/connection_types.cpp

src/util/bip32.h

src/common/license_info.cpp

src/util/stdmutex.h

src/common/run_command.cpp

src/util/check.cpp

src/util/golombrice.h

src/node/types.h

src/node/timeoffsets.h

src/util/readwritefile.cpp

src/util/fastrange.h

src/util/signalinterrupt.h

src/util/task_runner.h

src/util/syserror.cpp

src/common/interfaces.cpp

src/common/types.h

src/util/threadinterrupt.h

src/kernel/chainstatemanager_opts.h

src/node/psbt.h

src/policy/ephemeral_policy.h

src/util/trace.h

src/common/url.cpp

src/kernel/mempool_options.h

src/util/serfloat.cpp

src/kernel/notifications_interface.h

src/node/timeoffsets.cpp

src/node/warnings.cpp

src/util/hash_type.h

src/crypto/hex_base.cpp

src/node/eviction.h

src/util/tokenbucket.h

src/crypto/aes.h

src/common/pcp.h

src/util/feefrac.cpp

src/node/transaction.h

src/util/threadnames.cpp

src/common/signmessage.h

src/util/exec.cpp

src/util/signalinterrupt.cpp

src/clientversion.cpp

src/common/signmessage.cpp

src/compat/assumptions.h

src/compat/byteswap.h

src/deploymentinfo.cpp

src/deploymentinfo.h

src/deploymentstatus.cpp

src/deploymentstatus.h

src/dummywallet.cpp

src/external_signer.h

src/init/bitcoin-gui.cpp

src/init/bitcoin-node.cpp

src/init/bitcoin-qt.cpp

src/init/bitcoin-wallet.cpp

src/init/bitcoind.cpp

src/init/common.h

src/interfaces/init.h

src/interfaces/ipc.h

src/key_io.h

src/logging/categories.h

src/logging/timer.h

src/mapport.h

src/musig.h

src/net_permissions.h

src/netgroup.h

src/netmessagemaker.h

src/node/chainstatemanager_args.cpp

src/node/connection_types.h

src/node/context.h

src/node/interface_ui.h

src/node/mempool_args.cpp

src/node/mining_args.cpp

src/node/minisketchwrapper.cpp

src/node/txreconciliation.h

src/policy/fees/estimator_args.cpp

src/policy/fees/estimator_args.h

src/policy/fees/estimator_man.cpp

src/policy/fees/estimator_man.h

src/policy/packages.h

src/policy/rbf.h

src/policy/truc_policy.h

src/pow.h

src/primitives/block.cpp

src/randomenv.h

src/rest.h

src/script/keyorigin.h

src/script/parsing.cpp

src/script/parsing.h

src/script/script_error.h

src/script/sigcache.cpp

src/script/sigcache.h

src/script/solver.h

src/script/verify_flags.h

src/semaphore_grant.h

src/signet.h

src/span.h

src/support/allocators/secure.h

src/support/allocators/zeroafterfree.h

src/util/tokenpipe.cpp

src/util/translation.h

src/util/vector.h

src/versionbits.h

src/versionbits_impl.h

src/wallet/external_signer_scriptpubkeyman.h

src/wallet/fees.h

src/wallet/load.h

src/wallet/receive.h

src/wallet/rpc/wallet.h

src/wallet/types.h

src/walletinitinterface.h

src/zmq/zmqabstractnotifier.cpp

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