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add comment about avoiding overflow

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smooth 2015-03-05 00:45:54 -08:00
parent 754a785ee1
commit 41a95e7b11
1 changed files with 6 additions and 0 deletions
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6
src/cryptonote_core/blockchain_storage.cpp
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@ -1709,6 +1709,12 @@ bool blockchain_storage::handle_block_to_main_chain(const block& bl, const crypt
bei.bl = bl; bei.bl = bl;
bei.block_cumulative_size = cumulative_block_size; bei.block_cumulative_size = cumulative_block_size;
bei.cumulative_difficulty = current_diffic; bei.cumulative_difficulty = current_diffic;
// In the "tail" state when the minimum subsidy (implemented in get_block_reward) is in effect, the number of
// coins will eventually exceed MONEY_SUPPLY and overflow a uint64. To prevent overflow, cap already_generated_coins
// at MONEY_SUPPLY. already_generated_coins is only used to compute the block subsidy and MONEY_SUPPLY yields a
// subsidy of 0 under the base formula and therefore the minimum subsidy >0 in the tail state.
bei.already_generated_coins = base_reward < (MONEY_SUPPLY-already_generated_coins) ? already_generated_coins + base_reward : MONEY_SUPPLY; bei.already_generated_coins = base_reward < (MONEY_SUPPLY-already_generated_coins) ? already_generated_coins + base_reward : MONEY_SUPPLY;
if(m_blocks.size()) if(m_blocks.size())