Make Backend::set_code able to fail (#231)

Author: sorpaas

interpreter/src/runtime.rs

@@ -143,7 +143,7 @@ pub trait RuntimeBackend: RuntimeBaseBackend {
 	/// Fully delete storages of an account.
 	fn reset_storage(&mut self, address: H160);
 	/// Set code of an account.
-	fn set_code(&mut self, address: H160, code: Vec<u8>);
+	fn set_code(&mut self, address: H160, code: Vec<u8>) -> Result<(), ExitError>;
 	/// Reset balance of an account.
 	fn reset_balance(&mut self, address: H160);
 	fn deposit(&mut self, target: H160, value: U256);

interpreter/tests/usability.rs

@@ -143,7 +143,7 @@ impl<'a> RuntimeBackend for UnimplementedHandler {
 		unimplemented!()
 	}
 
-	fn set_code(&mut self, _address: H160, _code: Vec<u8>) {
+	fn set_code(&mut self, _address: H160, _code: Vec<u8>) -> Result<(), ExitError> {
 		unimplemented!()
 	}
 

src/backend/in_memory.rs

@@ -214,12 +214,14 @@ impl RuntimeBackend for InMemoryBackend {
 			.storage = Default::default();
 	}
 
-	fn set_code(&mut self, address: H160, code: Vec<u8>) {
+	fn set_code(&mut self, address: H160, code: Vec<u8>) -> Result<(), ExitError> {
 		self.current_layer_mut()
 			.state
 			.entry(address)
 			.or_default()
 			.code = code;
+
+		Ok(())
 	}
 
 	fn reset_balance(&mut self, address: H160) {

src/standard/invoker/routines.rs

@@ -238,7 +238,7 @@ where
 
 	StaticGasometer::record_codedeposit(gasometer, retbuf.len())?;
 
-	handler.set_code(address, retbuf.clone());
+	handler.set_code(address, retbuf.clone())?;
 
 	Ok(())
 }