openethereum/ethcore/src/trace/noop_tracer.rs

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// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Nonoperative tracer.
use util::{Bytes, Address, U256};
use action_params::ActionParams;
use trace::{Tracer, VMTracer, FlatTrace, TraceError};
use trace::trace::{Call, Create, VMTrace};
/// Nonoperative tracer. Does not trace anything.
pub struct NoopTracer;
impl Tracer for NoopTracer {
fn prepare_trace_call(&self, _: &ActionParams) -> Option<Call> {
None
}
fn prepare_trace_create(&self, _: &ActionParams) -> Option<Create> {
None
}
fn prepare_trace_output(&self) -> Option<Bytes> {
None
}
fn trace_call(&mut self, call: Option<Call>, _: U256, output: Option<Bytes>, _: Vec<FlatTrace>) {
assert!(call.is_none(), "self.prepare_trace_call().is_none(): so we can't be tracing: qed");
assert!(output.is_none(), "self.prepare_trace_output().is_none(): so we can't be tracing: qed");
}
fn trace_create(&mut self, create: Option<Create>, _: U256, code: Option<Bytes>, _: Address, _: Vec<FlatTrace>) {
assert!(create.is_none(), "self.prepare_trace_create().is_none(): so we can't be tracing: qed");
assert!(code.is_none(), "self.prepare_trace_output().is_none(): so we can't be tracing: qed");
}
fn trace_failed_call(&mut self, call: Option<Call>, _: Vec<FlatTrace>, _: TraceError) {
assert!(call.is_none(), "self.prepare_trace_call().is_none(): so we can't be tracing: qed");
}
fn trace_failed_create(&mut self, create: Option<Create>, _: Vec<FlatTrace>, _: TraceError) {
assert!(create.is_none(), "self.prepare_trace_create().is_none(): so we can't be tracing: qed");
}
fn trace_suicide(&mut self, _address: Address, _balance: U256, _refund_address: Address) {
}
fn subtracer(&self) -> Self {
NoopTracer
}
fn traces(self) -> Vec<FlatTrace> {
vec![]
}
}
/// Nonoperative VM tracer. Does not trace anything.
pub struct NoopVMTracer;
impl VMTracer for NoopVMTracer {
/// Trace the preparation to execute a single instruction.
fn trace_prepare_execute(&mut self, _pc: usize, _instruction: u8, _gas_cost: &U256) -> bool { false }
/// Trace the finalised execution of a single instruction.
fn trace_executed(&mut self, _gas_used: U256, _stack_push: &[U256], _mem_diff: Option<(usize, &[u8])>, _store_diff: Option<(U256, U256)>) {}
/// Spawn subtracer which will be used to trace deeper levels of execution.
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fn prepare_subtrace(&self, _code: &[u8]) -> Self { NoopVMTracer }
/// Spawn subtracer which will be used to trace deeper levels of execution.
fn done_subtrace(&mut self, _sub: Self) {}
/// Consumes self and returns all VM traces.
fn drain(self) -> Option<VMTrace> { None }
}