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b083db617a
Typo introduced in0003911326: $ git blame src/coins.cpp | grep occurrances00039113(2017-04-25 11:29:29 -0700 89) // deal with the pre-BIP30 occurrances of duplicate coinbase transactions.
252 lines
10 KiB
C++
252 lines
10 KiB
C++
// Copyright (c) 2012-2016 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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#include "coins.h"
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#include "consensus/consensus.h"
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#include "memusage.h"
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#include "random.h"
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#include <assert.h>
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bool CCoinsView::GetCoin(const COutPoint &outpoint, Coin &coin) const { return false; }
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bool CCoinsView::HaveCoin(const COutPoint &outpoint) const { return false; }
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uint256 CCoinsView::GetBestBlock() const { return uint256(); }
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bool CCoinsView::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return false; }
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CCoinsViewCursor *CCoinsView::Cursor() const { return 0; }
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CCoinsViewBacked::CCoinsViewBacked(CCoinsView *viewIn) : base(viewIn) { }
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bool CCoinsViewBacked::GetCoin(const COutPoint &outpoint, Coin &coin) const { return base->GetCoin(outpoint, coin); }
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bool CCoinsViewBacked::HaveCoin(const COutPoint &outpoint) const { return base->HaveCoin(outpoint); }
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uint256 CCoinsViewBacked::GetBestBlock() const { return base->GetBestBlock(); }
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void CCoinsViewBacked::SetBackend(CCoinsView &viewIn) { base = &viewIn; }
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bool CCoinsViewBacked::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return base->BatchWrite(mapCoins, hashBlock); }
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CCoinsViewCursor *CCoinsViewBacked::Cursor() const { return base->Cursor(); }
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size_t CCoinsViewBacked::EstimateSize() const { return base->EstimateSize(); }
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SaltedOutpointHasher::SaltedOutpointHasher() : k0(GetRand(std::numeric_limits<uint64_t>::max())), k1(GetRand(std::numeric_limits<uint64_t>::max())) {}
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CCoinsViewCache::CCoinsViewCache(CCoinsView *baseIn) : CCoinsViewBacked(baseIn), cachedCoinsUsage(0) {}
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size_t CCoinsViewCache::DynamicMemoryUsage() const {
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return memusage::DynamicUsage(cacheCoins) + cachedCoinsUsage;
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}
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CCoinsMap::iterator CCoinsViewCache::FetchCoin(const COutPoint &outpoint) const {
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CCoinsMap::iterator it = cacheCoins.find(outpoint);
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if (it != cacheCoins.end())
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return it;
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Coin tmp;
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if (!base->GetCoin(outpoint, tmp))
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return cacheCoins.end();
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CCoinsMap::iterator ret = cacheCoins.emplace(std::piecewise_construct, std::forward_as_tuple(outpoint), std::forward_as_tuple(std::move(tmp))).first;
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if (ret->second.coin.IsSpent()) {
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// The parent only has an empty entry for this outpoint; we can consider our
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// version as fresh.
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ret->second.flags = CCoinsCacheEntry::FRESH;
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}
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cachedCoinsUsage += ret->second.coin.DynamicMemoryUsage();
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return ret;
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}
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bool CCoinsViewCache::GetCoin(const COutPoint &outpoint, Coin &coin) const {
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CCoinsMap::const_iterator it = FetchCoin(outpoint);
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if (it != cacheCoins.end()) {
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coin = it->second.coin;
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return true;
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}
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return false;
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}
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void CCoinsViewCache::AddCoin(const COutPoint &outpoint, Coin&& coin, bool possible_overwrite) {
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assert(!coin.IsSpent());
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if (coin.out.scriptPubKey.IsUnspendable()) return;
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CCoinsMap::iterator it;
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bool inserted;
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std::tie(it, inserted) = cacheCoins.emplace(std::piecewise_construct, std::forward_as_tuple(outpoint), std::tuple<>());
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bool fresh = false;
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if (!inserted) {
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cachedCoinsUsage -= it->second.coin.DynamicMemoryUsage();
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}
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if (!possible_overwrite) {
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if (!it->second.coin.IsSpent()) {
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throw std::logic_error("Adding new coin that replaces non-pruned entry");
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}
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fresh = !(it->second.flags & CCoinsCacheEntry::DIRTY);
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}
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it->second.coin = std::move(coin);
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it->second.flags |= CCoinsCacheEntry::DIRTY | (fresh ? CCoinsCacheEntry::FRESH : 0);
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cachedCoinsUsage += it->second.coin.DynamicMemoryUsage();
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}
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void AddCoins(CCoinsViewCache& cache, const CTransaction &tx, int nHeight) {
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bool fCoinbase = tx.IsCoinBase();
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const uint256& txid = tx.GetHash();
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for (size_t i = 0; i < tx.vout.size(); ++i) {
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// Pass fCoinbase as the possible_overwrite flag to AddCoin, in order to correctly
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// deal with the pre-BIP30 occurrences of duplicate coinbase transactions.
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cache.AddCoin(COutPoint(txid, i), Coin(tx.vout[i], nHeight, fCoinbase), fCoinbase);
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}
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}
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void CCoinsViewCache::SpendCoin(const COutPoint &outpoint, Coin* moveout) {
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CCoinsMap::iterator it = FetchCoin(outpoint);
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if (it == cacheCoins.end()) return;
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cachedCoinsUsage -= it->second.coin.DynamicMemoryUsage();
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if (moveout) {
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*moveout = std::move(it->second.coin);
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}
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if (it->second.flags & CCoinsCacheEntry::FRESH) {
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cacheCoins.erase(it);
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} else {
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it->second.flags |= CCoinsCacheEntry::DIRTY;
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it->second.coin.Clear();
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}
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}
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static const Coin coinEmpty;
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const Coin& CCoinsViewCache::AccessCoin(const COutPoint &outpoint) const {
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CCoinsMap::const_iterator it = FetchCoin(outpoint);
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if (it == cacheCoins.end()) {
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return coinEmpty;
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} else {
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return it->second.coin;
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}
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}
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bool CCoinsViewCache::HaveCoin(const COutPoint &outpoint) const {
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CCoinsMap::const_iterator it = FetchCoin(outpoint);
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return (it != cacheCoins.end() && !it->second.coin.IsSpent());
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}
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bool CCoinsViewCache::HaveCoinInCache(const COutPoint &outpoint) const {
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CCoinsMap::const_iterator it = cacheCoins.find(outpoint);
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return it != cacheCoins.end();
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}
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uint256 CCoinsViewCache::GetBestBlock() const {
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if (hashBlock.IsNull())
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hashBlock = base->GetBestBlock();
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return hashBlock;
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}
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void CCoinsViewCache::SetBestBlock(const uint256 &hashBlockIn) {
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hashBlock = hashBlockIn;
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}
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bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlockIn) {
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for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
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if (it->second.flags & CCoinsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
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CCoinsMap::iterator itUs = cacheCoins.find(it->first);
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if (itUs == cacheCoins.end()) {
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// The parent cache does not have an entry, while the child does
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// We can ignore it if it's both FRESH and pruned in the child
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if (!(it->second.flags & CCoinsCacheEntry::FRESH && it->second.coin.IsSpent())) {
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// Otherwise we will need to create it in the parent
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// and move the data up and mark it as dirty
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CCoinsCacheEntry& entry = cacheCoins[it->first];
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entry.coin = std::move(it->second.coin);
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cachedCoinsUsage += entry.coin.DynamicMemoryUsage();
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entry.flags = CCoinsCacheEntry::DIRTY;
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// We can mark it FRESH in the parent if it was FRESH in the child
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// Otherwise it might have just been flushed from the parent's cache
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// and already exist in the grandparent
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if (it->second.flags & CCoinsCacheEntry::FRESH)
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entry.flags |= CCoinsCacheEntry::FRESH;
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}
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} else {
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// Assert that the child cache entry was not marked FRESH if the
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// parent cache entry has unspent outputs. If this ever happens,
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// it means the FRESH flag was misapplied and there is a logic
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// error in the calling code.
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if ((it->second.flags & CCoinsCacheEntry::FRESH) && !itUs->second.coin.IsSpent())
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throw std::logic_error("FRESH flag misapplied to cache entry for base transaction with spendable outputs");
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// Found the entry in the parent cache
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if ((itUs->second.flags & CCoinsCacheEntry::FRESH) && it->second.coin.IsSpent()) {
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// The grandparent does not have an entry, and the child is
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// modified and being pruned. This means we can just delete
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// it from the parent.
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cachedCoinsUsage -= itUs->second.coin.DynamicMemoryUsage();
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cacheCoins.erase(itUs);
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} else {
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// A normal modification.
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cachedCoinsUsage -= itUs->second.coin.DynamicMemoryUsage();
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itUs->second.coin = std::move(it->second.coin);
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cachedCoinsUsage += itUs->second.coin.DynamicMemoryUsage();
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itUs->second.flags |= CCoinsCacheEntry::DIRTY;
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// NOTE: It is possible the child has a FRESH flag here in
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// the event the entry we found in the parent is pruned. But
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// we must not copy that FRESH flag to the parent as that
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// pruned state likely still needs to be communicated to the
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// grandparent.
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}
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}
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}
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CCoinsMap::iterator itOld = it++;
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mapCoins.erase(itOld);
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}
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hashBlock = hashBlockIn;
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return true;
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}
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bool CCoinsViewCache::Flush() {
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bool fOk = base->BatchWrite(cacheCoins, hashBlock);
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cacheCoins.clear();
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cachedCoinsUsage = 0;
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return fOk;
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}
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void CCoinsViewCache::Uncache(const COutPoint& hash)
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{
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CCoinsMap::iterator it = cacheCoins.find(hash);
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if (it != cacheCoins.end() && it->second.flags == 0) {
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cachedCoinsUsage -= it->second.coin.DynamicMemoryUsage();
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cacheCoins.erase(it);
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}
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}
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unsigned int CCoinsViewCache::GetCacheSize() const {
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return cacheCoins.size();
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}
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CAmount CCoinsViewCache::GetValueIn(const CTransaction& tx) const
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{
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if (tx.IsCoinBase())
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return 0;
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CAmount nResult = 0;
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for (unsigned int i = 0; i < tx.vin.size(); i++)
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nResult += AccessCoin(tx.vin[i].prevout).out.nValue;
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return nResult;
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}
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bool CCoinsViewCache::HaveInputs(const CTransaction& tx) const
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{
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if (!tx.IsCoinBase()) {
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for (unsigned int i = 0; i < tx.vin.size(); i++) {
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if (!HaveCoin(tx.vin[i].prevout)) {
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return false;
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}
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}
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}
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return true;
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}
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static const size_t MAX_OUTPUTS_PER_BLOCK = MAX_BLOCK_BASE_SIZE / ::GetSerializeSize(CTxOut(), SER_NETWORK, PROTOCOL_VERSION); // TODO: merge with similar definition in undo.h.
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const Coin& AccessByTxid(const CCoinsViewCache& view, const uint256& txid)
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{
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COutPoint iter(txid, 0);
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while (iter.n < MAX_OUTPUTS_PER_BLOCK) {
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const Coin& alternate = view.AccessCoin(iter);
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if (!alternate.IsSpent()) return alternate;
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++iter.n;
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}
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return coinEmpty;
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}
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