ethereumjs-vm
Version:
An Ethereum VM implementation
154 lines • 6.28 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
var BN = require("bn.js");
var ethereumjs_account_1 = require("ethereumjs-account");
var ethereumjs_blockchain_1 = require("ethereumjs-blockchain");
var ethereumjs_common_1 = require("ethereumjs-common");
var state_1 = require("./state");
var runCode_1 = require("./runCode");
var runCall_1 = require("./runCall");
var runTx_1 = require("./runTx");
var runBlock_1 = require("./runBlock");
var opcodes_1 = require("./evm/opcodes");
var runBlockchain_1 = require("./runBlockchain");
var promisified_1 = require("./state/promisified");
var promisify = require('util.promisify');
var AsyncEventEmitter = require('async-eventemitter');
var Trie = require('merkle-patricia-tree/secure.js');
/**
* Execution engine which can be used to run a blockchain, individual
* blocks, individual transactions, or snippets of EVM bytecode.
*
* This class is an AsyncEventEmitter, please consult the README to learn how to use it.
*/
var VM = /** @class */ (function (_super) {
__extends(VM, _super);
/**
* Instantiates a new [[VM]] Object.
* @param opts - Default values for the options are:
* - `chain`: 'mainnet'
* - `hardfork`: 'petersburg' [supported: 'byzantium', 'constantinople', 'petersburg', 'istanbul' (DRAFT) (will throw on unsupported)]
* - `activatePrecompiles`: false
* - `allowUnlimitedContractSize`: false [ONLY set to `true` during debugging]
*/
function VM(opts) {
if (opts === void 0) { opts = {}; }
var _this = _super.call(this) || this;
_this.opts = opts;
if (opts.common) {
if (opts.chain || opts.hardfork) {
throw new Error('You can only instantiate the VM class with one of: opts.common, or opts.chain and opts.hardfork');
}
_this._common = opts.common;
}
else {
var chain = opts.chain ? opts.chain : 'mainnet';
var hardfork = opts.hardfork ? opts.hardfork : 'petersburg';
var supportedHardforks = [
'byzantium',
'constantinople',
'petersburg',
'istanbul',
'muirGlacier',
];
_this._common = new ethereumjs_common_1.default(chain, hardfork, supportedHardforks);
}
// Set list of opcodes based on HF
_this._opcodes = opcodes_1.getOpcodesForHF(_this._common);
if (opts.stateManager) {
_this.stateManager = opts.stateManager;
}
else {
var trie = opts.state || new Trie();
if (opts.activatePrecompiles) {
for (var i = 1; i <= 8; i++) {
trie.put(new BN(i).toArrayLike(Buffer, 'be', 20), new ethereumjs_account_1.default().serialize());
}
}
_this.stateManager = new state_1.StateManager({ trie: trie, common: _this._common });
}
_this.pStateManager = new promisified_1.default(_this.stateManager);
_this.blockchain = opts.blockchain || new ethereumjs_blockchain_1.default({ common: _this._common });
_this.allowUnlimitedContractSize =
opts.allowUnlimitedContractSize === undefined ? false : opts.allowUnlimitedContractSize;
// We cache this promisified function as it's called from the main execution loop, and
// promisifying each time has a huge performance impact.
_this._emit = promisify(_this.emit.bind(_this));
return _this;
}
/**
* Processes blocks and adds them to the blockchain.
*
* This method modifies the state.
*
* @param blockchain - A [blockchain](https://github.com/ethereum/ethereumjs-blockchain) object to process
*/
VM.prototype.runBlockchain = function (blockchain) {
return runBlockchain_1.default.bind(this)(blockchain);
};
/**
* Processes the `block` running all of the transactions it contains and updating the miner's account
*
* This method modifies the state. If `generate` is `true`, the state modifications will be
* reverted if an exception is raised. If it's `false`, it won't revert if the block's header is
* invalid. If an error is thrown from an event handler, the state may or may not be reverted.
*
* @param opts - Default values for options:
* - `generate`: false
*/
VM.prototype.runBlock = function (opts) {
return runBlock_1.default.bind(this)(opts);
};
/**
* Process a transaction. Run the vm. Transfers eth. Checks balances.
*
* This method modifies the state. If an error is thrown, the modifications are reverted, except
* when the error is thrown from an event handler. In the latter case the state may or may not be
* reverted.
*/
VM.prototype.runTx = function (opts) {
return runTx_1.default.bind(this)(opts);
};
/**
* runs a call (or create) operation.
*
* This method modifies the state.
*/
VM.prototype.runCall = function (opts) {
return runCall_1.default.bind(this)(opts);
};
/**
* Runs EVM code.
*
* This method modifies the state.
*/
VM.prototype.runCode = function (opts) {
return runCode_1.default.bind(this)(opts);
};
/**
* Returns a copy of the [[VM]] instance.
*/
VM.prototype.copy = function () {
return new VM({
stateManager: this.stateManager.copy(),
blockchain: this.blockchain,
common: this._common,
});
};
return VM;
}(AsyncEventEmitter));
exports.default = VM;
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