elog (events) for wasm runtime

ethcore/res/wasm-tests

@@ -1 +1 @@
-Subproject commit c8129ce2f36c26ed634eda786960978a28e28d0e
+Subproject commit 94b7877b5826a53627b8732ea0feb45869dd04ab

ethcore/wasm/src/env.rs

@@ -147,6 +147,11 @@ pub const SIGNATURES: &'static [UserFunctionDescriptor] = &[
 		&[I32],
 		None,
 	),
+	Static(
+		"_elog",
+		&[I32; 4],
+		None,
+	),
 
 	// TODO: Get rid of it also somehow?
 	Static(

ethcore/wasm/src/runtime.rs

@@ -55,6 +55,8 @@ pub enum UserTrap {
 	Unknown,
 	/// Passed string had invalid utf-8 encoding
 	BadUtf8,
+	/// Log event error
+	Log,
 	/// Other error in native code
 	Other,
 	/// Panic with message
@@ -75,6 +77,7 @@ impl ::std::fmt::Display for UserTrap {
 			UserTrap::AllocationFailed => write!(f, "Memory allocation failed (OOM)"),
 			UserTrap::BadUtf8 => write!(f, "String encoding is bad utf-8 sequence"),
 			UserTrap::GasLimit => write!(f, "Invocation resulted in gas limit violated"),
+			UserTrap::Log => write!(f, "Error occured while logging an event"),
 			UserTrap::Other => write!(f, "Other unspecified error"),
 			UserTrap::Panic(ref msg) => write!(f, "Panic: {}", msg),
 		}
@@ -232,6 +235,21 @@ impl<'a, 'b> Runtime<'a, 'b> {
 		}
 	}
 
+	pub fn overflow_charge<F>(&mut self, f: F) -> Result<(), InterpreterError>
+		where F: FnOnce(&vm::Schedule) -> Option<u64>
+	{
+		let amount = match f(self.ext.schedule()) {
+			Some(amount) => amount,
+			None => { return Err(UserTrap::GasLimit.into()); }
+		};
+
+		if !self.charge_gas(amount as u64) {
+			Err(UserTrap::GasLimit.into())
+		} else {
+			Ok(())
+		}
+	}
+
 	/// Invoke create in the state runtime
 	pub fn create(&mut self, context: InterpreterCallerContext)
 		-> Result<Option<interpreter::RuntimeValue>, InterpreterError>
@@ -749,6 +767,44 @@ impl<'a, 'b> Runtime<'a, 'b> {
 	pub fn ext(&mut self) -> &mut vm::Ext {
 		self.ext
 	}
+
+	pub fn log(&mut self, context: InterpreterCallerContext)
+		-> Result<Option<interpreter::RuntimeValue>, InterpreterError>
+	{
+		// signature is:
+		// pub fn elog(topic_ptr: *const u8, topic_count: u32, data_ptr: *const u8, data_len: u32);
+		let data_len = context.value_stack.pop_as::<i32>()? as u32;
+		let data_ptr = context.value_stack.pop_as::<i32>()? as u32;
+		let topic_count = context.value_stack.pop_as::<i32>()? as u32;
+		let topic_ptr = context.value_stack.pop_as::<i32>()? as u32;
+
+		if topic_count > 4 {
+			return Err(UserTrap::Log.into());
+		}
+
+		self.overflow_charge(|schedule|
+			{
+				let topics_gas = schedule.log_gas as u64 + schedule.log_topic_gas as u64 * topic_count as u64;
+				(schedule.log_data_gas as u64)
+					.checked_mul(schedule.log_data_gas as u64)
+					.and_then(|data_gas| data_gas.checked_add(topics_gas))
+			}
+		)?;
+
+		let mut topics: Vec<H256> = Vec::with_capacity(topic_count as usize);
+		topics.resize(topic_count as usize, H256::zero());
+		for i in 0..topic_count {
+			let offset = i.checked_mul(32).ok_or(UserTrap::MemoryAccessViolation)?
+				.checked_add(topic_ptr).ok_or(UserTrap::MemoryAccessViolation)?;
+
+			*topics.get_mut(i as usize)
+				.expect("topics is resized to `topic_count`, i is in 0..topic count iterator, get_mut uses i as an indexer, get_mut cannot fail; qed")
+				= H256::from(&self.memory.get(offset, 32)?[..]);
+		}
+		self.ext.log(topics, &self.memory.get(data_ptr, data_len as usize)?).map_err(|_| UserTrap::Log)?;
+
+		Ok(None)
+	}
 }
 
 impl<'a, 'b> interpreter::UserFunctionExecutor<UserTrap> for Runtime<'a, 'b> {
@@ -833,6 +889,9 @@ impl<'a, 'b> interpreter::UserFunctionExecutor<UserTrap> for Runtime<'a, 'b> {
 			"_value" => {
 				self.value(context)
 			},
+			"_elog" => {
+				self.log(context)
+			},
 			_ => {
 				trace!(target: "wasm", "Trapped due to unhandled function: '{}'", name);
 				Ok(self.unknown_trap(context)?)

ethcore/wasm/src/tests.rs

@@ -680,7 +680,6 @@ fn externs() {
 
 #[test]
 fn embedded_keccak() {
-
 	::ethcore_logger::init_log();
 	let mut code = load_sample!("keccak.wasm");
 	code.extend_from_slice(b"something");
@@ -704,3 +703,38 @@ fn embedded_keccak() {
 	assert_eq!(H256::from_slice(&result), H256::from("68371d7e884c168ae2022c82bd837d51837718a7f7dfb7aa3f753074a35e1d87"));
 	assert_eq!(gas_left, U256::from(80_452));
 }
+
+/// This test checks the correctness of log extern
+/// Target test puts one event with two topic [keccak(input), reverse(keccak(input))]
+/// and reversed input as a data
+#[test]
+fn events() {
+	::ethcore_logger::init_log();
+	let code = load_sample!("events.wasm");
+
+	let mut params = ActionParams::default();
+	params.gas = U256::from(100_000);
+	params.code = Some(Arc::new(code));
+	params.data = Some(b"something".to_vec());
+
+	let mut ext = FakeExt::new();
+
+	let (gas_left, result) = {
+		let mut interpreter = wasm_interpreter();
+		let result = interpreter.exec(params, &mut ext).expect("Interpreter to execute without any errors");
+		match result {
+			GasLeft::Known(_) => { panic!("events should return payload"); },
+			GasLeft::NeedsReturn { gas_left: gas, data: result, apply_state: _apply } => (gas, result.to_vec()),
+		}
+	};
+
+	assert_eq!(ext.logs.len(), 1);
+	let log_entry = &ext.logs[0];
+	assert_eq!(log_entry.topics.len(), 2);
+	assert_eq!(&log_entry.topics[0], &H256::from("68371d7e884c168ae2022c82bd837d51837718a7f7dfb7aa3f753074a35e1d87"));
+	assert_eq!(&log_entry.topics[1], &H256::from("871d5ea37430753faab7dff7a7187783517d83bd822c02e28a164c887e1d3768"));
+	assert_eq!(&log_entry.data, b"gnihtemos");
+
+	assert_eq!(&result, b"gnihtemos");
+	assert_eq!(gas_left, U256::from(78039));
+}