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test: Check that no versionbits are re-used

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This allows to remove check that windows for the same bit are disjoint

This addresses https://github.com/bitcoin/bitcoin/pull/21377#discussion_r611492633
This commit is contained in:
MarcoFalke
2021-04-15 10:02:32 +02:00
parent 8e69370b15
commit fad4167871
1 changed files with 11 additions and 15 deletions
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26
src/test/versionbits_tests.cpp
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@@ -273,20 +273,6 @@ BOOST_AUTO_TEST_CASE(versionbits_sanity)
if (mainnetParams.vDeployments[i].nStartTime == Consensus::BIP9Deployment::ALWAYS_ACTIVE || mainnetParams.vDeployments[i].nStartTime == Consensus::BIP9Deployment::NEVER_ACTIVE) {
BOOST_CHECK_EQUAL(mainnetParams.vDeployments[i].min_activation_height, 0);
}
// Verify that the deployment windows of different deployment using the
// same bit are disjoint.
// This test may need modification at such time as a new deployment
// is proposed that reuses the bit of an activated soft fork, before the
// end time of that soft fork. (Alternatively, the end time of that
// activated soft fork could be later changed to be earlier to avoid
// overlap.)
for (int j=i+1; j<(int) Consensus::MAX_VERSION_BITS_DEPLOYMENTS; j++) {
if (VersionBitsMask(mainnetParams, static_cast<Consensus::DeploymentPos>(j)) == bitmask) {
BOOST_CHECK(mainnetParams.vDeployments[j].nStartTime > mainnetParams.vDeployments[i].nTimeout ||
mainnetParams.vDeployments[i].nStartTime > mainnetParams.vDeployments[j].nTimeout);
}
}
}
}
@@ -443,8 +429,18 @@ BOOST_AUTO_TEST_CASE(versionbits_computeblockversion)
// ACTIVE and FAILED states in roughly the way we expect
for (const auto& chain_name : {CBaseChainParams::MAIN, CBaseChainParams::TESTNET, CBaseChainParams::SIGNET, CBaseChainParams::REGTEST}) {
const auto chainParams = CreateChainParams(*m_node.args, chain_name);
uint32_t chain_all_vbits{0};
for (int i = 0; i < (int)Consensus::MAX_VERSION_BITS_DEPLOYMENTS; ++i) {
check_computeblockversion(chainParams->GetConsensus(), static_cast<Consensus::DeploymentPos>(i));
const auto dep = static_cast<Consensus::DeploymentPos>(i);
// Check that no bits are re-used (within the same chain). This is
// disallowed because the transition to FAILED (on timeout) does
// not take precedence over STARTED/LOCKED_IN. So all softforks on
// the same bit might overlap, even when non-overlapping start-end
// times are picked.
const uint32_t dep_mask{VersionBitsMask(chainParams->GetConsensus(), dep)};
BOOST_CHECK(!(chain_all_vbits & dep_mask));
chain_all_vbits |= dep_mask;
check_computeblockversion(chainParams->GetConsensus(), dep);
}
}