openethereum/ethcore/evm/src/factory.rs

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// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.
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// Parity Ethereum 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
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity Ethereum is distributed in the hope that it will be useful,
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// 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 Ethereum. If not, see <http://www.gnu.org/licenses/>.
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//! Evm factory.
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//!
use std::sync::Arc;
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use vm::{Exec, Schedule};
use ethereum_types::U256;
use super::vm::ActionParams;
use super::interpreter::SharedCache;
use super::vmtype::VMType;
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/// Evm factory. Creates appropriate Evm.
#[derive(Clone)]
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pub struct Factory {
evm: VMType,
evm_cache: Arc<SharedCache>,
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}
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impl Factory {
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/// Create fresh instance of VM
/// Might choose implementation depending on supplied gas.
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pub fn create(&self, params: ActionParams, schedule: &Schedule, depth: usize) -> Box<Exec> {
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match self.evm {
VMType::Interpreter => if Self::can_fit_in_usize(&params.gas) {
Box::new(super::interpreter::Interpreter::<usize>::new(params, self.evm_cache.clone(), schedule, depth))
} else {
Box::new(super::interpreter::Interpreter::<U256>::new(params, self.evm_cache.clone(), schedule, depth))
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}
}
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}
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/// Create new instance of specific `VMType` factory, with a size in bytes
/// for caching jump destinations.
pub fn new(evm: VMType, cache_size: usize) -> Self {
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Factory {
evm: evm,
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evm_cache: Arc::new(SharedCache::new(cache_size)),
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}
}
fn can_fit_in_usize(gas: &U256) -> bool {
gas == &U256::from(gas.low_u64() as usize)
}
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}
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impl Default for Factory {
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/// Returns native rust evm factory
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fn default() -> Factory {
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Factory {
evm: VMType::Interpreter,
evm_cache: Arc::new(SharedCache::default()),
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}
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}
}
#[test]
fn test_create_vm() {
use vm::Ext;
use vm::tests::FakeExt;
use bytes::Bytes;
let mut params = ActionParams::default();
params.code = Some(Arc::new(Bytes::default()));
let ext = FakeExt::new();
let _vm = Factory::default().create(params, ext.schedule(), ext.depth());
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}
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/// Create tests by injecting different VM factories
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#[macro_export]
macro_rules! evm_test(
($name_test: ident: $name_int: ident) => {
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#[test]
fn $name_int() {
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$name_test(Factory::new(VMType::Interpreter, 1024 * 32));
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}
}
);
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/// Create ignored tests by injecting different VM factories
#[macro_export]
macro_rules! evm_test_ignore(
($name_test: ident: $name_int: ident) => {
#[test]
#[ignore]
#[cfg(feature = "ignored-tests")]
fn $name_int() {
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$name_test(Factory::new(VMType::Interpreter, 1024 * 32));
}
}
);