Support direct input stripping in Tracer

ethcore/src/executive.rs

@@ -410,7 +410,7 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 			let default = [];
 			let data = if let Some(ref d) = params.data { d as &[u8] } else { &default as &[u8] };
 
-			let mut trace_info = tracer.prepare_trace_call(&params);
+			let mut trace_info = tracer.prepare_trace_call(&params, self.depth == 0);
 
 			let cost = builtin.cost(data);
 			if cost <= params.gas {
@@ -435,10 +435,6 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 						}
 						trace_output
 					} else {
-						// Disable recording input and output to avoid possible attacks.
-						if let Some(trace_info) = trace_info.as_mut() {
-							trace_info.input = None;
-						}
 						None
 					};
 
@@ -465,7 +461,7 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 				Err(vm::Error::OutOfGas)
 			}
 		} else {
-			let trace_info = tracer.prepare_trace_call(&params);
+			let trace_info = tracer.prepare_trace_call(&params, true);
 			let mut trace_output = tracer.prepare_trace_output();
 			let mut subtracer = tracer.subtracer();
 

ethcore/src/trace/executive_tracer.rs

@@ -84,8 +84,8 @@ fn should_prefix_address_properly() {
 impl Tracer for ExecutiveTracer {
 	type Output = FlatTrace;
 
-	fn prepare_trace_call(&self, params: &ActionParams) -> Option<Call> {
-		Some(Call::from_action_params(params, true))
+	fn prepare_trace_call(&self, params: &ActionParams, record_input: bool) -> Option<Call> {
+		Some(Call::from_action_params(params, record_input))
 	}
 
 	fn prepare_trace_create(&self, params: &ActionParams) -> Option<Create> {

ethcore/src/trace/mod.rs

@@ -49,7 +49,7 @@ pub trait Tracer: Send {
 	type Output;
 
 	/// Prepares call trace for given params. Noop tracer should return None.
-	fn prepare_trace_call(&self, params: &ActionParams) -> Option<Call>;
+	fn prepare_trace_call(&self, params: &ActionParams, record_input: bool) -> Option<Call>;
 
 	/// Prepares create trace for given params. Noop tracer should return None.
 	fn prepare_trace_create(&self, params: &ActionParams) -> Option<Create>;

ethcore/src/trace/noop_tracer.rs

@@ -28,7 +28,7 @@ pub struct NoopTracer;
 impl Tracer for NoopTracer {
 	type Output = FlatTrace;
 
-	fn prepare_trace_call(&self, _: &ActionParams) -> Option<Call> {
+	fn prepare_trace_call(&self, _: &ActionParams, _: bool) -> Option<Call> {
 		None
 	}