scriptcache.h

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// Copyright (c) 2017 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_SCRIPT_SCRIPTCACHE_H
#define BITCOIN_SCRIPT_SCRIPTCACHE_H
 
#include <array>
#include <cstdint>
 
#include <sync.h>
 
// Actually declared in validation.cpp; can't include because of circular
// dependency.
extern RecursiveMutex cs_main;
 
class CTransaction;
 
class ScriptCacheKey {
    std::array<uint8_t, 28> data;
 
public:
    ScriptCacheKey() = default;
    ScriptCacheKey(const ScriptCacheKey &rhs) = default;
    ScriptCacheKey(const CTransaction &tx, uint32_t flags);
 
    ScriptCacheKey &operator=(const ScriptCacheKey &rhs) = default;
 
    bool operator==(const ScriptCacheKey &rhs) const {
        return rhs.data == data;
    }
 
    friend class ScriptCacheHasher;
};
 
// DoS prevention: limit cache size to 32MB (over 1000000 entries on 64-bit
// systems). Due to how we count cache size, actual memory usage is slightly
// more (~32.25 MB)
static const unsigned int DEFAULT_MAX_SCRIPT_CACHE_SIZE = 32;
// Maximum sig cache size allowed
static const int64_t MAX_MAX_SCRIPT_CACHE_SIZE = 16384;
 
void InitScriptExecutionCache();
 
bool IsKeyInScriptCache(ScriptCacheKey key, bool erase, int &nSigChecksOut)
    EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
void AddKeyInScriptCache(ScriptCacheKey key, int nSigChecks)
    EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
#endif // BITCOIN_SCRIPT_SCRIPTCACHE_H