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    // Copyright 2015-2017 Parity Technologies (UK) Ltd.
    // This file is part of Parity.

    // Parity is free software: you can redistribute it and/or modify
    // it under the terms of the GNU General Public License as published by
    // the Free Software Foundation, either version 3 of the License, or
    // (at your option) any later version.

    // Parity is distributed in the hope that it will be useful,
    // but WITHOUT ANY WARRANTY; without even the implied warranty of
    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    // GNU General Public License for more details.

    // You should have received a copy of the GNU General Public License
    // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

    //! Cost schedule and other parameterisations for the EVM.

    /// Definition of the cost schedule and other parameterisations for the EVM.
    pub struct Schedule {
    	/// Does it support exceptional failed code deposit
    	pub exceptional_failed_code_deposit: bool,
    	/// Does it have a delegate cal
    	pub have_delegate_call: bool,
    	/// VM stack limit
    	pub stack_limit: usize,
    	/// Max number of nested calls/creates
    	pub max_depth: usize,
    	/// Gas prices for instructions in all tiers
    	pub tier_step_gas: [usize; 8],
    	/// Gas price for `EXP` opcode
    	pub exp_gas: usize,
    	/// Additional gas for `EXP` opcode for each byte of exponent
    	pub exp_byte_gas: usize,
    	/// Gas price for `SHA3` opcode
    	pub sha3_gas: usize,
    	/// Additional gas for `SHA3` opcode for each word of hashed memory
    	pub sha3_word_gas: usize,
    	/// Gas price for loading from storage
    	pub sload_gas: usize,
    	/// Gas price for setting new value to storage (`storage==0`, `new!=0`)
    	pub sstore_set_gas: usize,
    	/// Gas price for altering value in storage
    	pub sstore_reset_gas: usize,
    	/// Gas refund for `SSTORE` clearing (when `storage!=0`, `new==0`)
    	pub sstore_refund_gas: usize,
    	/// Gas price for `JUMPDEST` opcode
    	pub jumpdest_gas: usize,
    	/// Gas price for `LOG*`
    	pub log_gas: usize,
    	/// Additional gas for data in `LOG*`
    	pub log_data_gas: usize,
    	/// Additional gas for each topic in `LOG*`
    	pub log_topic_gas: usize,
    	/// Gas price for `CREATE` opcode
    	pub create_gas: usize,
    	/// Gas price for `*CALL*` opcodes
    	pub call_gas: usize,
    	/// Stipend for transfer for `CALL|CALLCODE` opcode when `value>0`
    	pub call_stipend: usize,
    	/// Additional gas required for value transfer (`CALL|CALLCODE`)
    	pub call_value_transfer_gas: usize,
    	/// Additional gas for creating new account (`CALL|CALLCODE`)
    	pub call_new_account_gas: usize,
    	/// Refund for SUICIDE
    	pub suicide_refund_gas: usize,
    	/// Gas for used memory
    	pub memory_gas: usize,
    	/// Coefficient used to convert memory size to gas price for memory
    	pub quad_coeff_div: usize,
    	/// Cost for contract length when executing `CREATE`
    	pub create_data_gas: usize,
    	/// Maximum code size when creating a contract.
    	pub create_data_limit: usize,
    	/// Transaction cost
    	pub tx_gas: usize,
    	/// `CREATE` transaction cost
    	pub tx_create_gas: usize,
    	/// Additional cost for empty data transaction
    	pub tx_data_zero_gas: usize,
    	/// Aditional cost for non-empty data transaction
    	pub tx_data_non_zero_gas: usize,
    	/// Gas price for copying memory
    	pub copy_gas: usize,
    	/// Price of EXTCODESIZE
    	pub extcodesize_gas: usize,
    	/// Base price of EXTCODECOPY
    	pub extcodecopy_base_gas: usize,
    	/// Price of BALANCE
    	pub balance_gas: usize,
    	/// Price of SUICIDE
    	pub suicide_gas: usize,
    	/// Amount of additional gas to pay when SUICIDE credits a non-existant account
    	pub suicide_to_new_account_cost: usize,
    	/// If Some(x): let limit = GAS * (x - 1) / x; let CALL's gas = min(requested, limit). let CREATE's gas = limit.
    	/// If None: let CALL's gas = (requested > GAS ? [OOG] : GAS). let CREATE's gas = GAS
    	pub sub_gas_cap_divisor: Option<usize>,
    	/// Don't ever make empty accounts; contracts start with nonce=1. Also, don't charge 25k when sending/suicide zero-value.
    	pub no_empty: bool,
    	/// Kill empty accounts if touched.
    	pub kill_empty: bool,
    }

    impl Schedule {
    	/// Schedule for the Frontier-era of the Ethereum main net.
    	pub fn new_frontier() -> Schedule {
    		Self::new(false, false, 21000)
    	}

    	/// Schedule for the Homestead-era of the Ethereum main net.
    	pub fn new_homestead() -> Schedule {
    		Self::new(true, true, 53000)
    	}

    	/// Schedule for the post-EIP-150-era of the Ethereum main net.
    	pub fn new_post_eip150(max_code_size: usize, fix_exp: bool, no_empty: bool, kill_empty: bool) -> Schedule {
    		Schedule {
    			exceptional_failed_code_deposit: true,
    			have_delegate_call: true,
    			stack_limit: 1024,
    			max_depth: 1024,
    			tier_step_gas: [0, 2, 3, 5, 8, 10, 20, 0],
    			exp_gas: 10,
    			exp_byte_gas: if fix_exp {50} else {10},
    			sha3_gas: 30,
    			sha3_word_gas: 6,
    			sload_gas: 200,
    			sstore_set_gas: 20000,
    			sstore_reset_gas: 5000,
    			sstore_refund_gas: 15000,
    			jumpdest_gas: 1,
    			log_gas: 375,
    			log_data_gas: 8,
    			log_topic_gas: 375,
    			create_gas: 32000,
    			call_gas: 700,
    			call_stipend: 2300,
    			call_value_transfer_gas: 9000,
    			call_new_account_gas: 25000,
    			suicide_refund_gas: 24000,
    			memory_gas: 3,
    			quad_coeff_div: 512,
    			create_data_gas: 200,
    			create_data_limit: max_code_size,
    			tx_gas: 21000,
    			tx_create_gas: 53000,
    			tx_data_zero_gas: 4,
    			tx_data_non_zero_gas: 68,
    			copy_gas: 3,
    			extcodesize_gas: 700,
    			extcodecopy_base_gas: 700,
    			balance_gas: 400,
    			suicide_gas: 5000,
    			suicide_to_new_account_cost: 25000,
    			sub_gas_cap_divisor: Some(64),
    			no_empty: no_empty,
    			kill_empty: kill_empty,
    		}
    	}

    	fn new(efcd: bool, hdc: bool, tcg: usize) -> Schedule {
    		Schedule {
    			exceptional_failed_code_deposit: efcd,
    			have_delegate_call: hdc,
    			stack_limit: 1024,
    			max_depth: 1024,
    			tier_step_gas: [0, 2, 3, 5, 8, 10, 20, 0],
    			exp_gas: 10,
    			exp_byte_gas: 10,
    			sha3_gas: 30,
    			sha3_word_gas: 6,
    			sload_gas: 50,
    			sstore_set_gas: 20000,
    			sstore_reset_gas: 5000,
    			sstore_refund_gas: 15000,
    			jumpdest_gas: 1,
    			log_gas: 375,
    			log_data_gas: 8,
    			log_topic_gas: 375,
    			create_gas: 32000,
    			call_gas: 40,
    			call_stipend: 2300,
    			call_value_transfer_gas: 9000,
    			call_new_account_gas: 25000,
    			suicide_refund_gas: 24000,
    			memory_gas: 3,
    			quad_coeff_div: 512,
    			create_data_gas: 200,
    			create_data_limit: usize::max_value(),
    			tx_gas: 21000,
    			tx_create_gas: tcg,
    			tx_data_zero_gas: 4,
    			tx_data_non_zero_gas: 68,
    			copy_gas: 3,
    			extcodesize_gas: 20,
    			extcodecopy_base_gas: 20,
    			balance_gas: 20,
    			suicide_gas: 0,
    			suicide_to_new_account_cost: 0,
    			sub_gas_cap_divisor: None,
    			no_empty: false,
    			kill_empty: false,
    		}
    	}
    }

    #[test]
    #[cfg(test)]
    fn schedule_evm_assumptions() {
    	let s1 = Schedule::new_frontier();
    	let s2 = Schedule::new_homestead();

    	// To optimize division we assume 2**9 for quad_coeff_div
    	assert_eq!(s1.quad_coeff_div, 512);
    	assert_eq!(s2.quad_coeff_div, 512);
    }

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