Merge d3f42fa08f into 66aa6a47bd

7c123c08dd  miner: add package feerate vector to CBlockTemplate (ismaelsadeeq)

Pull request description:

  This PR enables `BlockAssembler` to add all selected packages' fee and virtual size to a vector, and then return the vector as a member of `CBlockTemplate` struct.

  This PR is the first step in the https://github.com/bitcoin/bitcoin/issues/30392 project.

  The packages' vsize and fee are used in #30157 to select a percentile fee rate of the top block in the mempool.

ACKs for top commit:
  rkrux:
    tACK 7c123c08dd
  ryanofsky:
    Code review ACK 7c123c08dd. Changes since last review are rebasing due to a test conflict, giving the new field a better name and description, resolving the test conflict, and renaming a lot of test variables. The actual code change is still one-line change.
  glozow:
    reACK 7c123c08dd

Tree-SHA512: 767b0b3d4273cf1589fd2068d729a66c7414c0f9574b15989fbe293f8c85cd6c641dd783cde55bfabab32cd047d7d8a071d6897b06ed4295c0d071e588de0861

CMakeLists.txt

@@ -186,16 +186,8 @@ string(APPEND CMAKE_CXX_LINK_EXECUTABLE " ${APPEND_LDFLAGS}")
 
 set(configure_warnings)
 
-include(CheckPIESupported)
-check_pie_supported(OUTPUT_VARIABLE check_pie_output LANGUAGES CXX)
-if(CMAKE_CXX_LINK_PIE_SUPPORTED)
-  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
-elseif(NOT WIN32)
-  # The warning is superfluous for Windows.
-  message(WARNING "PIE is not supported at link time: ${check_pie_output}")
-  list(APPEND configure_warnings "Position independent code disabled.")
-endif()
-unset(check_pie_output)
+include(CheckLinkerSupportsPIE)
+check_linker_supports_pie(configure_warnings)
 
 # The core_interface library aims to encapsulate common build flags.
 # It is a usage requirement for all targets except for secp256k1, which

cmake/module/CheckLinkerSupportsPIE.cmake

@@ -0,0 +1,30 @@
+# Copyright (c) 2024-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+include_guard(GLOBAL)
+
+function(check_linker_supports_pie warnings)
+  # This forces running a linker.
+  set(CMAKE_TRY_COMPILE_TARGET_TYPE EXECUTABLE)
+
+  # Workaround for a bug in the check_pie_supported() function.
+  # See:
+  # - https://gitlab.kitware.com/cmake/cmake/-/issues/26463
+  # - https://gitlab.kitware.com/cmake/cmake/-/merge_requests/10034
+  if(CMAKE_VERSION VERSION_LESS 3.32)
+    # CMAKE_CXX_COMPILE_OPTIONS_PIE is a list, whereas CMAKE_REQUIRED_FLAGS
+    # must be a string. Therefore, a proper conversion is required.
+    list(JOIN CMAKE_CXX_COMPILE_OPTIONS_PIE " " CMAKE_REQUIRED_FLAGS)
+  endif()
+
+  include(CheckPIESupported)
+  check_pie_supported(OUTPUT_VARIABLE output LANGUAGES CXX)
+  if(CMAKE_CXX_LINK_PIE_SUPPORTED)
+    set(CMAKE_POSITION_INDEPENDENT_CODE ON PARENT_SCOPE)
+  elseif(NOT WIN32)
+    # The warning is superfluous for Windows.
+    message(WARNING "PIE is not supported at link time: ${output}")
+    set(${warnings} ${${warnings}} "Position independent code disabled." PARENT_SCOPE)
+  endif()
+endfunction()

src/node/miner.cpp

@@ -421,6 +421,7 @@ void BlockAssembler::addPackageTxs(int& nPackagesSelected, int& nDescendantsUpda
         }
 
         ++nPackagesSelected;
+        pblocktemplate->m_package_feerates.emplace_back(packageFees, static_cast<int32_t>(packageSize));
 
         // Update transactions that depend on each of these
         nDescendantsUpdated += UpdatePackagesForAdded(mempool, ancestors, mapModifiedTx);

src/node/miner.h

@@ -10,6 +10,7 @@
 #include <policy/policy.h>
 #include <primitives/block.h>
 #include <txmempool.h>
+#include <util/feefrac.h>
 
 #include <memory>
 #include <optional>
@@ -39,6 +40,9 @@ struct CBlockTemplate
     std::vector<CAmount> vTxFees;
     std::vector<int64_t> vTxSigOpsCost;
     std::vector<unsigned char> vchCoinbaseCommitment;
+    /* A vector of package fee rates, ordered by the sequence in which
+     * packages are selected for inclusion in the block template.*/
+    std::vector<FeeFrac> m_package_feerates;
 };
 
 // Container for tracking updates to ancestor feerate as we include (parent)

src/test/miner_tests.cpp

@@ -16,6 +16,7 @@
 #include <txmempool.h>
 #include <uint256.h>
 #include <util/check.h>
+#include <util/feefrac.h>
 #include <util/strencodings.h>
 #include <util/time.h>
 #include <util/translation.h>
@@ -25,6 +26,7 @@
 #include <test/util/setup_common.h>
 
 #include <memory>
+#include <vector>
 
 #include <boost/test/unit_test.hpp>
 
@@ -123,19 +125,22 @@ void MinerTestingSetup::TestPackageSelection(const CScript& scriptPubKey, const
     tx.vout[0].nValue = 5000000000LL - 1000;
     // This tx has a low fee: 1000 satoshis
     Txid hashParentTx = tx.GetHash(); // save this txid for later use
-    AddToMempool(tx_mempool, entry.Fee(1000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx));
+    const auto parent_tx{entry.Fee(1000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx)};
+    AddToMempool(tx_mempool, parent_tx);
 
     // This tx has a medium fee: 10000 satoshis
     tx.vin[0].prevout.hash = txFirst[1]->GetHash();
     tx.vout[0].nValue = 5000000000LL - 10000;
     Txid hashMediumFeeTx = tx.GetHash();
-    AddToMempool(tx_mempool, entry.Fee(10000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx));
+    const auto medium_fee_tx{entry.Fee(10000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx)};
+    AddToMempool(tx_mempool, medium_fee_tx);
 
     // This tx has a high fee, but depends on the first transaction
     tx.vin[0].prevout.hash = hashParentTx;
     tx.vout[0].nValue = 5000000000LL - 1000 - 50000; // 50k satoshi fee
     Txid hashHighFeeTx = tx.GetHash();
-    AddToMempool(tx_mempool, entry.Fee(50000).Time(Now<NodeSeconds>()).SpendsCoinbase(false).FromTx(tx));
+    const auto high_fee_tx{entry.Fee(50000).Time(Now<NodeSeconds>()).SpendsCoinbase(false).FromTx(tx)};
+    AddToMempool(tx_mempool, high_fee_tx);
 
     std::unique_ptr<BlockTemplate> block_template = mining->createNewBlock(options);
     BOOST_REQUIRE(block_template);
@@ -145,6 +150,21 @@ void MinerTestingSetup::TestPackageSelection(const CScript& scriptPubKey, const
     BOOST_CHECK(block.vtx[2]->GetHash() == hashHighFeeTx);
     BOOST_CHECK(block.vtx[3]->GetHash() == hashMediumFeeTx);
 
+    // Test the inclusion of package feerates in the block template and ensure they are sequential.
+    const auto block_package_feerates = BlockAssembler{m_node.chainman->ActiveChainstate(), &tx_mempool, options}.CreateNewBlock()->m_package_feerates;
+    BOOST_CHECK(block_package_feerates.size() == 2);
+
+    // parent_tx and high_fee_tx are added to the block as a package.
+    const auto combined_txs_fee = parent_tx.GetFee() + high_fee_tx.GetFee();
+    const auto combined_txs_size = parent_tx.GetTxSize() + high_fee_tx.GetTxSize();
+    FeeFrac package_feefrac{combined_txs_fee, combined_txs_size};
+    // The package should be added first.
+    BOOST_CHECK(block_package_feerates[0] == package_feefrac);
+
+    // The medium_fee_tx should be added next.
+    FeeFrac medium_tx_feefrac{medium_fee_tx.GetFee(), medium_fee_tx.GetTxSize()};
+    BOOST_CHECK(block_package_feerates[1] == medium_tx_feefrac);
+
     // Test that a package below the block min tx fee doesn't get included
     tx.vin[0].prevout.hash = hashHighFeeTx;
     tx.vout[0].nValue = 5000000000LL - 1000 - 50000; // 0 fee