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80 lines
3.2 KiB
80 lines
3.2 KiB
// Copyright (c) 2016 The Bitcoin Core developers |
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// Distributed under the MIT software license, see the accompanying |
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// file COPYING or http://www.opensource.org/licenses/mit-license.php. |
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#ifndef BITCOIN_CONSENSUS_VERSIONBITS |
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#define BITCOIN_CONSENSUS_VERSIONBITS |
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#include "chain.h" |
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#include <map> |
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/** What block version to use for new blocks (pre versionbits) */ |
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static const int32_t VERSIONBITS_LAST_OLD_BLOCK_VERSION = 4; |
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/** What bits to set in version for versionbits blocks */ |
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static const int32_t VERSIONBITS_TOP_BITS = 0x20000000UL; |
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/** What bitmask determines whether versionbits is in use */ |
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static const int32_t VERSIONBITS_TOP_MASK = 0xE0000000UL; |
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/** Total bits available for versionbits */ |
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static const int32_t VERSIONBITS_NUM_BITS = 29; |
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enum ThresholdState { |
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THRESHOLD_DEFINED, |
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THRESHOLD_STARTED, |
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THRESHOLD_LOCKED_IN, |
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THRESHOLD_ACTIVE, |
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THRESHOLD_FAILED, |
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}; |
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// A map that gives the state for blocks whose height is a multiple of Period(). |
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// The map is indexed by the block's parent, however, so all keys in the map |
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// will either be NULL or a block with (height + 1) % Period() == 0. |
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typedef std::map<const CBlockIndex*, ThresholdState> ThresholdConditionCache; |
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struct BIP9DeploymentInfo { |
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/** Deployment name */ |
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const char *name; |
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/** Whether GBT clients can safely ignore this rule in simplified usage */ |
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bool gbt_force; |
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}; |
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struct BIP9Stats { |
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int period; |
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int threshold; |
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int elapsed; |
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int count; |
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bool possible; |
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}; |
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extern const struct BIP9DeploymentInfo VersionBitsDeploymentInfo[]; |
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/** |
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* Abstract class that implements BIP9-style threshold logic, and caches results. |
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*/ |
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class AbstractThresholdConditionChecker { |
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protected: |
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virtual bool Condition(const CBlockIndex* pindex, const Consensus::Params& params) const =0; |
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virtual int64_t BeginTime(const Consensus::Params& params) const =0; |
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virtual int64_t EndTime(const Consensus::Params& params) const =0; |
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virtual int Period(const Consensus::Params& params) const =0; |
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virtual int Threshold(const Consensus::Params& params) const =0; |
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public: |
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BIP9Stats GetStateStatisticsFor(const CBlockIndex* pindex, const Consensus::Params& params) const; |
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// Note that the functions below take a pindexPrev as input: they compute information for block B based on its parent. |
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ThresholdState GetStateFor(const CBlockIndex* pindexPrev, const Consensus::Params& params, ThresholdConditionCache& cache) const; |
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int GetStateSinceHeightFor(const CBlockIndex* pindexPrev, const Consensus::Params& params, ThresholdConditionCache& cache) const; |
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}; |
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struct VersionBitsCache |
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{ |
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ThresholdConditionCache caches[Consensus::MAX_VERSION_BITS_DEPLOYMENTS]; |
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void Clear(); |
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}; |
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ThresholdState VersionBitsState(const CBlockIndex* pindexPrev, const Consensus::Params& params, Consensus::DeploymentPos pos, VersionBitsCache& cache); |
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BIP9Stats VersionBitsStatistics(const CBlockIndex* pindexPrev, const Consensus::Params& params, Consensus::DeploymentPos pos); |
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int VersionBitsStateSinceHeight(const CBlockIndex* pindexPrev, const Consensus::Params& params, Consensus::DeploymentPos pos, VersionBitsCache& cache); |
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uint32_t VersionBitsMask(const Consensus::Params& params, Consensus::DeploymentPos pos); |
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#endif
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