feat: add impl for 4 byte

Author: prestwich

Cargo.toml

@@ -45,6 +45,7 @@ alloy = { version = "1.0.25", default-features = false, features = [
 ] }
 
 revm = { version = "27.1", default-features = false }
+revm-inspectors = { version = "0.27.1", optional = true }
 
 dashmap = { version = "6.1.0", optional = true }
 tracing = { version = "0.1.41", optional = true }
@@ -69,6 +70,7 @@ default = [
     "call",
     "concurrent-db",
     "estimate_gas",
+    "tracing-inspectors",
     "revm/std",
     "revm/c-kzg",
     "revm/blst",
@@ -111,3 +113,4 @@ full_env_cfg = [
     "optional_eip3607",
     "optional_no_base_fee",
 ]
+tracing-inspectors = ["dep:revm-inspectors", "alloy/rpc-types-trace"]

src/inspectors/mod.rs

@@ -4,6 +4,9 @@ pub use layer::Layered;
 mod timeout;
 pub use timeout::TimeLimit;
 
+#[cfg(feature = "tracing-inspectors")]
+mod tracing;
+
 mod set;
 pub use set::InspectorSet;
 

src/inspectors/tracing.rs

@@ -0,0 +1,20 @@
+use crate::{helpers::Ctx, inspectors::InspectorWithOutput};
+use alloy::rpc::types::trace::geth::FourByteFrame;
+use revm::Database;
+use revm_inspectors::tracing::FourByteInspector;
+
+impl<Db: Database> InspectorWithOutput<Ctx<Db>> for FourByteInspector {
+    type Output = FourByteFrame;
+
+    fn has_output(&self) -> bool {
+        self.inner().len() > 0
+    }
+
+    fn reset_output(&mut self) {
+        *self = Self::default();
+    }
+
+    fn take_output(&mut self) -> Self::Output {
+        std::mem::take(self).into()
+    }
+}