68 lines
1.7 KiB
Rust
68 lines
1.7 KiB
Rust
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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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//! Return data structures
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use util::U256;
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/// Return data buffer. Holds memory from a previous call and a slice into that memory.
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#[derive(Debug)]
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pub struct ReturnData {
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mem: Vec<u8>,
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offset: usize,
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size: usize,
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}
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impl ::std::ops::Deref for ReturnData {
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type Target = [u8];
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fn deref(&self) -> &[u8] {
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&self.mem[self.offset..self.offset + self.size]
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}
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}
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impl ReturnData {
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/// Create empty `ReturnData`.
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pub fn empty() -> Self {
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ReturnData {
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mem: Vec::new(),
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offset: 0,
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size: 0,
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}
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}
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/// Create `ReturnData` from give buffer and slice.
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pub fn new(mem: Vec<u8>, offset: usize, size: usize) -> Self {
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ReturnData {
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mem: mem,
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offset: offset,
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size: size,
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}
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}
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}
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/// Gas Left: either it is a known value, or it needs to be computed by processing
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/// a return instruction.
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#[derive(Debug)]
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pub enum GasLeft {
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/// Known gas left
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Known(U256),
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/// Return or Revert instruction must be processed.
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NeedsReturn {
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/// Amount of gas left.
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gas_left: U256,
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/// Return data buffer.
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data: ReturnData,
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/// Apply or revert state changes on revert.
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apply_state: bool
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},
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} |