332 lines
9.7 KiB
Rust
332 lines
9.7 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Cost schedule and other parameterisations for the EVM.
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/// Definition of the cost schedule and other parameterisations for the EVM.
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pub struct Schedule {
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/// Does it support exceptional failed code deposit
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pub exceptional_failed_code_deposit: bool,
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/// Does it have a delegate cal
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pub have_delegate_call: bool,
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/// Does it have a CREATE_P2SH instruction
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pub have_create2: bool,
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/// Does it have a REVERT instruction
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pub have_revert: bool,
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/// VM stack limit
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pub stack_limit: usize,
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/// Max number of nested calls/creates
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pub max_depth: usize,
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/// Gas prices for instructions in all tiers
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pub tier_step_gas: [usize; 8],
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/// Gas price for `EXP` opcode
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pub exp_gas: usize,
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/// Additional gas for `EXP` opcode for each byte of exponent
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pub exp_byte_gas: usize,
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/// Gas price for `SHA3` opcode
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pub sha3_gas: usize,
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/// Additional gas for `SHA3` opcode for each word of hashed memory
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pub sha3_word_gas: usize,
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/// Gas price for loading from storage
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pub sload_gas: usize,
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/// Gas price for setting new value to storage (`storage==0`, `new!=0`)
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pub sstore_set_gas: usize,
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/// Gas price for altering value in storage
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pub sstore_reset_gas: usize,
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/// Gas refund for `SSTORE` clearing (when `storage!=0`, `new==0`)
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pub sstore_refund_gas: usize,
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/// Gas price for `JUMPDEST` opcode
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pub jumpdest_gas: usize,
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/// Gas price for `LOG*`
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pub log_gas: usize,
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/// Additional gas for data in `LOG*`
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pub log_data_gas: usize,
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/// Additional gas for each topic in `LOG*`
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pub log_topic_gas: usize,
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/// Gas price for `CREATE` opcode
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pub create_gas: usize,
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/// Gas price for `*CALL*` opcodes
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pub call_gas: usize,
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/// Stipend for transfer for `CALL|CALLCODE` opcode when `value>0`
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pub call_stipend: usize,
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/// Additional gas required for value transfer (`CALL|CALLCODE`)
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pub call_value_transfer_gas: usize,
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/// Additional gas for creating new account (`CALL|CALLCODE`)
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pub call_new_account_gas: usize,
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/// Refund for SUICIDE
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pub suicide_refund_gas: usize,
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/// Gas for used memory
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pub memory_gas: usize,
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/// Coefficient used to convert memory size to gas price for memory
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pub quad_coeff_div: usize,
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/// Cost for contract length when executing `CREATE`
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pub create_data_gas: usize,
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/// Maximum code size when creating a contract.
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pub create_data_limit: usize,
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/// Transaction cost
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pub tx_gas: usize,
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/// `CREATE` transaction cost
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pub tx_create_gas: usize,
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/// Additional cost for empty data transaction
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pub tx_data_zero_gas: usize,
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/// Aditional cost for non-empty data transaction
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pub tx_data_non_zero_gas: usize,
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/// Gas price for copying memory
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pub copy_gas: usize,
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/// Price of EXTCODESIZE
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pub extcodesize_gas: usize,
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/// Base price of EXTCODECOPY
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pub extcodecopy_base_gas: usize,
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/// Price of BALANCE
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pub balance_gas: usize,
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/// Price of SUICIDE
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pub suicide_gas: usize,
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/// Amount of additional gas to pay when SUICIDE credits a non-existant account
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pub suicide_to_new_account_cost: usize,
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/// If Some(x): let limit = GAS * (x - 1) / x; let CALL's gas = min(requested, limit). let CREATE's gas = limit.
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/// If None: let CALL's gas = (requested > GAS ? [OOG] : GAS). let CREATE's gas = GAS
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pub sub_gas_cap_divisor: Option<usize>,
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/// Don't ever make empty accounts; contracts start with nonce=1. Also, don't charge 25k when sending/suicide zero-value.
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pub no_empty: bool,
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/// Kill empty accounts if touched.
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pub kill_empty: bool,
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/// Blockhash instruction gas cost.
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pub blockhash_gas: usize,
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/// Static Call opcode enabled.
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pub have_static_call: bool,
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/// RETURNDATA and RETURNDATASIZE opcodes enabled.
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pub have_return_data: bool,
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/// Kill basic accounts below this balance if touched.
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pub kill_dust: CleanDustMode,
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/// Enable EIP-86 rules
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pub eip86: bool,
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/// Wasm extra schedule settings, if wasm activated
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pub wasm: Option<WasmCosts>,
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}
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/// Wasm cost table
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pub struct WasmCosts {
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/// Default opcode cost
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pub regular: u32,
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/// Div operations multiplier.
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pub div: u32,
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/// Div operations multiplier.
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pub mul: u32,
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/// Memory (load/store) operations multiplier.
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pub mem: u32,
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/// General static query of U256 value from env-info
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pub static_u256: u32,
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/// General static query of Address value from env-info
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pub static_address: u32,
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/// Memory stipend. Amount of free memory (in 64kb pages) each contract can use for stack.
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pub initial_mem: u32,
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/// Grow memory cost, per page (64kb)
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pub grow_mem: u32,
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/// Memory copy cost, per byte
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pub memcpy: u32,
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/// Max stack height (native WebAssembly stack limiter)
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pub max_stack_height: u32,
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/// Cost of wasm opcode is calculated as TABLE_ENTRY_COST * `opcodes_mul` / `opcodes_div`
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pub opcodes_mul: u32,
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/// Cost of wasm opcode is calculated as TABLE_ENTRY_COST * `opcodes_mul` / `opcodes_div`
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pub opcodes_div: u32,
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}
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impl Default for WasmCosts {
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fn default() -> Self {
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WasmCosts {
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regular: 1,
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div: 16,
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mul: 4,
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mem: 2,
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static_u256: 64,
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static_address: 40,
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initial_mem: 4096,
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grow_mem: 8192,
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memcpy: 1,
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max_stack_height: 64*1024,
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opcodes_mul: 3,
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opcodes_div: 8,
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}
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}
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}
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/// Dust accounts cleanup mode.
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#[derive(PartialEq, Eq)]
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pub enum CleanDustMode {
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/// Dust cleanup is disabled.
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Off,
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/// Basic dust accounts will be removed.
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BasicOnly,
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/// Basic and contract dust accounts will be removed.
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WithCodeAndStorage,
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}
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impl Schedule {
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/// Schedule for the Frontier-era of the Ethereum main net.
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pub fn new_frontier() -> Schedule {
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Self::new(false, false, 21000)
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}
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/// Schedule for the Homestead-era of the Ethereum main net.
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pub fn new_homestead() -> Schedule {
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Self::new(true, true, 53000)
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}
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/// Schedule for the post-EIP-150-era of the Ethereum main net.
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pub fn new_post_eip150(max_code_size: usize, fix_exp: bool, no_empty: bool, kill_empty: bool) -> Schedule {
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Schedule {
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exceptional_failed_code_deposit: true,
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have_delegate_call: true,
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have_create2: false,
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have_revert: false,
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have_return_data: false,
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stack_limit: 1024,
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max_depth: 1024,
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tier_step_gas: [0, 2, 3, 5, 8, 10, 20, 0],
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exp_gas: 10,
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exp_byte_gas: if fix_exp {50} else {10},
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sha3_gas: 30,
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sha3_word_gas: 6,
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sload_gas: 200,
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sstore_set_gas: 20000,
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sstore_reset_gas: 5000,
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sstore_refund_gas: 15000,
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jumpdest_gas: 1,
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log_gas: 375,
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log_data_gas: 8,
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log_topic_gas: 375,
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create_gas: 32000,
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call_gas: 700,
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call_stipend: 2300,
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call_value_transfer_gas: 9000,
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call_new_account_gas: 25000,
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suicide_refund_gas: 24000,
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memory_gas: 3,
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quad_coeff_div: 512,
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create_data_gas: 200,
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create_data_limit: max_code_size,
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tx_gas: 21000,
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tx_create_gas: 53000,
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tx_data_zero_gas: 4,
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tx_data_non_zero_gas: 68,
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copy_gas: 3,
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extcodesize_gas: 700,
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extcodecopy_base_gas: 700,
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balance_gas: 400,
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suicide_gas: 5000,
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suicide_to_new_account_cost: 25000,
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sub_gas_cap_divisor: Some(64),
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no_empty: no_empty,
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kill_empty: kill_empty,
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blockhash_gas: 20,
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have_static_call: false,
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kill_dust: CleanDustMode::Off,
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eip86: false,
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wasm: None,
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}
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}
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/// Schedule for the Byzantium fork of the Ethereum main net.
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pub fn new_byzantium() -> Schedule {
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let mut schedule = Self::new_post_eip150(24576, true, true, true);
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schedule.have_create2 = true;
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schedule.have_revert = true;
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schedule.have_static_call = true;
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schedule.have_return_data = true;
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schedule
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}
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fn new(efcd: bool, hdc: bool, tcg: usize) -> Schedule {
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Schedule {
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exceptional_failed_code_deposit: efcd,
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have_delegate_call: hdc,
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have_create2: false,
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have_revert: false,
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have_return_data: false,
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stack_limit: 1024,
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max_depth: 1024,
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tier_step_gas: [0, 2, 3, 5, 8, 10, 20, 0],
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exp_gas: 10,
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exp_byte_gas: 10,
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sha3_gas: 30,
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sha3_word_gas: 6,
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sload_gas: 50,
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sstore_set_gas: 20000,
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sstore_reset_gas: 5000,
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sstore_refund_gas: 15000,
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jumpdest_gas: 1,
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log_gas: 375,
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log_data_gas: 8,
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log_topic_gas: 375,
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create_gas: 32000,
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call_gas: 40,
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call_stipend: 2300,
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call_value_transfer_gas: 9000,
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call_new_account_gas: 25000,
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suicide_refund_gas: 24000,
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memory_gas: 3,
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quad_coeff_div: 512,
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create_data_gas: 200,
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create_data_limit: usize::max_value(),
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tx_gas: 21000,
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tx_create_gas: tcg,
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tx_data_zero_gas: 4,
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tx_data_non_zero_gas: 68,
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copy_gas: 3,
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extcodesize_gas: 20,
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extcodecopy_base_gas: 20,
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balance_gas: 20,
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suicide_gas: 0,
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suicide_to_new_account_cost: 0,
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sub_gas_cap_divisor: None,
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no_empty: false,
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kill_empty: false,
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blockhash_gas: 20,
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have_static_call: false,
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kill_dust: CleanDustMode::Off,
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eip86: false,
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wasm: None,
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}
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}
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/// Returns wasm schedule
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///
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/// May panic if there is no wasm schedule
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pub fn wasm(&self) -> &WasmCosts {
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// *** Prefer PANIC here instead of silently breaking consensus! ***
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self.wasm.as_ref().expect("Wasm schedule expected to exist while checking wasm contract. Misconfigured client?")
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}
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}
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impl Default for Schedule {
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fn default() -> Self {
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Schedule::new_frontier()
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}
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}
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#[test]
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#[cfg(test)]
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fn schedule_evm_assumptions() {
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let s1 = Schedule::new_frontier();
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let s2 = Schedule::new_homestead();
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// To optimize division we assume 2**9 for quad_coeff_div
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assert_eq!(s1.quad_coeff_div, 512);
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assert_eq!(s2.quad_coeff_div, 512);
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}
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