ext call refactored

src/evm/ext.rs

@@ -6,6 +6,20 @@ use util::bytes::*;
 use evm::{Schedule, Error};
 use env_info::*;
 
+pub struct CallResult {
+	pub gas_left: U256,
+	pub success: bool
+}
+
+impl CallResult {
+	pub fn new(gas_left: U256, success: bool) -> Self {
+		CallResult {
+			gas_left: gas_left,
+			success: success
+		}
+	}
+}
+
 pub trait Ext {
 	/// Returns a value for given key.
 	fn sload(&self, key: &H256) -> H256;
@@ -26,8 +40,9 @@ pub trait Ext {
 
 	/// Message call.
 	/// 
-	/// If call is successfull, returns gas left.
-	/// otherwise `Error`.
+	/// Returns None, if we run out of gas.
+	/// Otherwise returns call_result which contains gas left 
+	/// and true if subcall was successfull.
 	fn call(&mut self, 
 			gas: &U256, 
 			call_gas: &U256, 
@@ -35,7 +50,7 @@ pub trait Ext {
 			value: &U256, 
 			data: &[u8], 
 			code_address: &Address, 
-			output: &mut [u8]) -> Result<U256, Error>;
+			output: &mut [u8]) -> Option<CallResult>;
 
 	/// Returns code at given address
 	fn extcode(&self, address: &Address) -> Vec<u8>;

src/evm/jit.rs

@@ -229,30 +229,21 @@ impl<'a> evmjit::Ext for ExtAdapter<'a> {
 				out_size: u64,
 				code_address: *const evmjit::H256) -> bool {
 		unsafe {
-			let res = self.ext.call(&U256::from(*io_gas), 
+			let opt = self.ext.call(&U256::from(*io_gas), 
 									&U256::from(call_gas), 
 									&Address::from_jit(&*receive_address),
 									&U256::from_jit(&*value),
 									slice::from_raw_parts(in_beg, in_size as usize),
 									&Address::from_jit(&*code_address),
 									slice::from_raw_parts_mut(out_beg, out_size as usize));
-
-			match res {
-				Ok(gas_left) => {
-					*io_gas = gas_left.low_u64();
-					true
-				},
-				Err(err @ evm::Error::OutOfGas) => {
-					*self.err = Some(err);
-					// hack to propagate `OutOfGas` to evmjit and stop
-					// the execution immediately.
-					// Works, cause evmjit uses i64, not u64
+			match opt {
+				None => {
 					*io_gas = -1i64 as u64;
 					false
 				},
-				Err(err) => {
-					*self.err = Some(err);
-					false
+				Some(res) => {
+					*io_gas = res.gas_left.low_u64();
+					res.success
 				}
 			}
 		}

src/evm/mod.rs

@@ -11,6 +11,6 @@ mod jit;
 mod tests;
 
 pub use self::evm::{Evm, Error, Result};
-pub use self::ext::Ext;
+pub use self::ext::{Ext, CallResult};
 pub use self::factory::Factory;
 pub use self::schedule::Schedule;

src/evm/tests.rs

@@ -1,6 +1,6 @@
 use common::*;
 use evm;
-use evm::{Ext, Schedule, Factory};
+use evm::{Ext, Schedule, Factory, CallResult};
 
 struct FakeLogEntry {
 	topics: Vec<H256>,
@@ -53,7 +53,7 @@ impl Ext for FakeExt {
 			_value: &U256, 
 			_data: &[u8], 
 			_code_address: &Address, 
-			_output: &mut [u8]) -> result::Result<U256, evm::Error> {
+			_output: &mut [u8]) -> Option<CallResult> {
 		unimplemented!();
 	}
 

src/executive.rs

@@ -2,7 +2,7 @@
 use common::*;
 use state::*;
 use engine::*;
-use evm::{self, Schedule, Factory, Ext};
+use evm::{self, Schedule, Factory, Ext, CallResult};
 
 /// Returns new address created from address and given nonce.
 pub fn contract_address(address: &Address, nonce: &U256) -> Address {
@@ -38,6 +38,8 @@ impl Substate {
 			contracts_created: vec![]
 		}
 	}
+
+	pub fn out_of_gas(&self) -> bool { self.out_of_gas }
 }
 
 /// Transaction execution receipt.
@@ -207,7 +209,8 @@ impl<'a> Executive<'a> {
 				let evm = Factory::create();
 				evm.exec(&params, &mut ext)
 			};
-			self.handle_out_of_gas(res, substate, backup)
+			self.revert_if_needed(&res, substate, backup);
+			res
 		} else {
 			// otherwise, nothing
 			Ok(params.gas)
@@ -232,7 +235,8 @@ impl<'a> Executive<'a> {
 			let evm = Factory::create();
 			evm.exec(&params, &mut ext)
 		};
-		self.handle_out_of_gas(res, substate, backup)
+		self.revert_if_needed(&res, substate, backup);
+		res
 	}
 
 	/// Finalizes the transaction (does refunds and suicides).
@@ -278,12 +282,11 @@ impl<'a> Executive<'a> {
 		}
 	}
 
-	pub fn handle_out_of_gas(&mut self, result: evm::Result, substate: &mut Substate, backup: State) -> evm::Result {
-		if let &Err(evm::Error::OutOfGas) = &result {
+	pub fn revert_if_needed(&mut self, result: &evm::Result, substate: &mut Substate, backup: State) {
+		if let &Err(evm::Error::OutOfGas) = result {
 			substate.out_of_gas = true;
 			self.state.revert(backup);
 		}
-		result
 	}
 }
 
@@ -398,7 +401,14 @@ impl<'a> Ext for Externalities<'a> {
 		//ex.create(&params, self.substate).map(|gas_left| (gas_left, Some(address)))
 	}
 
-	fn call(&mut self, gas: &U256, call_gas: &U256, receive_address: &Address, value: &U256, data: &[u8], code_address: &Address, output: &mut [u8]) -> Result<U256, evm::Error> {
+	fn call(&mut self, 
+			gas: &U256, 
+			call_gas: &U256, 
+			receive_address: &Address, 
+			value: &U256, 
+			data: &[u8], 
+			code_address: &Address, 
+			output: &mut [u8]) -> Option<CallResult> {
 		let mut gas_cost = *call_gas;
 		let mut call_gas = *call_gas;
 
@@ -414,14 +424,17 @@ impl<'a> Ext for Externalities<'a> {
 		}
 
 		if gas_cost > *gas {
-			return Err(evm::Error::OutOfGas)
+			self.substate.out_of_gas = true;
+			return None;
+			//return (U256::from(-1i64 as u64), false);
 		}
 
 		let gas = *gas - gas_cost;
 
 		// if balance is insufficient or we are to deep, return
 		if self.state.balance(&self.params.address) < *value || self.depth >= self.schedule.max_depth {
-			return Ok(gas + call_gas)
+			return Some(CallResult::new(gas + call_gas, true));
+			//return (gas + call_gas, true);
 		}
 
 		let params = ActionParams {
@@ -436,7 +449,14 @@ impl<'a> Ext for Externalities<'a> {
 		};
 
 		let mut ex = Executive::from_parent(self.state, self.info, self.engine, self.depth);
-		ex.call(&params, self.substate, BytesRef::Fixed(output)).map(|gas_left| gas + gas_left)
+		match ex.call(&params, self.substate, BytesRef::Fixed(output)) {
+			Ok(gas_left) => Some(CallResult::new(gas + gas_left, true)),
+			_ => {
+				self.substate.out_of_gas = true;
+				Some(CallResult::new(gas, false))
+			}
+		}
+		//ex.call(&params, self.substate, BytesRef::Fixed(output)).map(|gas_left| gas + gas_left)
 	}
 
 	fn extcode(&self, address: &Address) -> Vec<u8> {

src/tests/executive.rs

@@ -4,7 +4,7 @@ use executive::*;
 use spec::*;
 use engine::*;
 use evm;
-use evm::{Schedule, Ext, Factory};
+use evm::{Schedule, Ext, Factory, CallResult};
 use ethereum;
 
 struct TestEngine {
@@ -110,21 +110,20 @@ impl<'a> Ext for TestExt<'a> {
 			value: &U256, 
 			data: &[u8], 
 			code_address: &Address, 
-			output: &mut [u8]) -> Result<U256, evm::Error> {
-		let res = self.ext.call(gas, call_gas, receive_address, value, data, code_address, output);
+			output: &mut [u8]) -> Option<CallResult> {
+		let opt = self.ext.call(gas, call_gas, receive_address, value, data, code_address, output);
 		let ext = &self.ext;
-		match res {
-			Ok(gas_left) if ext.state.balance(&ext.params.address) >= *value => {
+		if let &Some(_) = &opt {
+			if ext.state.balance(&ext.params.address) >= *value {
 				self.callcreates.push(CallCreate {
 					data: data.to_vec(),
 					destination: receive_address.clone(),
 					_gas_limit: *call_gas,
 					value: *value
 				});
-				Ok(gas_left)
-			},
-			other => other
+			}
 		}
+		opt
 	}
 
 	fn extcode(&self, address: &Address) -> Vec<u8> {