1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70
// Copyright 2015-2018 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/>. //! Return data structures use ethereum_types::U256; /// Return data buffer. Holds memory from a previous call and a slice into that memory. #[derive(Debug)] pub struct ReturnData { mem: Vec<u8>, offset: usize, size: usize, } impl ::std::ops::Deref for ReturnData { type Target = [u8]; fn deref(&self) -> &[u8] { &self.mem[self.offset..self.offset + self.size] } } impl ReturnData { /// Create empty `ReturnData`. pub fn empty() -> Self { ReturnData { mem: Vec::new(), offset: 0, size: 0, } } /// Create `ReturnData` from give buffer and slice. pub fn new(mem: Vec<u8>, offset: usize, size: usize) -> Self { ReturnData { mem: mem, offset: offset, size: size, } } } /// Gas Left: either it is a known value, or it needs to be computed by processing /// a return instruction. #[derive(Debug)] pub enum GasLeft { /// Known gas left Known(U256), /// Return or Revert instruction must be processed. NeedsReturn { /// Amount of gas left. gas_left: U256, /// Return data buffer. data: ReturnData, /// Apply or revert state changes on revert. apply_state: bool }, }