Fix nits and fix call tracers

Signed-off-by: Danil <deniallugo@gmail.com>

core/lib/multivm/src/interface/traits/vm.rs

@@ -1,51 +1,52 @@
-/// This module contains traits for the VM interface.
-/// All VMs should implement these traits to be used in our system.
-/// The trait is generic over the storage type, allowing it to be used with any storage implementation.
-/// Additionally, this trait is generic over HistoryMode, allowing it to be used with or without history.
-///
-/// `TracerDispatcher` is an associated type used to dispatch tracers in VMs.
-/// It manages tracers across different VM versions.
-/// Even though we use the same interface for all VM versions,
-/// we can now specify only the necessary trait bounds for each VM version.
-///
-/// Generally speaking, in most cases, the tracer dispatcher is a wrapper around `Vec<Box<dyn VmTracer>>`,
-/// where `VmTracer` is a trait implemented for a specific VM version.
-///
-/// Example usage:
-/// ```
-/// use std::{
-///     cell::RefCell,
-///     rc::Rc,
-///     sync::Arc
-/// };
-/// use once_cell::sync::OnceCell;
-/// use multivm::{
-///     interface::{L1BatchEnv, SystemEnv, VmInterface},
-///     tracers::CallTracer ,
-///     vm_latest::ToTracerPointer
-/// };
-/// use zksync_state::{InMemoryStorage, StorageView};
-/// use zksync_types::Transaction;
-///
-/// // Prepare the environment for the VM.
-/// let l1_batch_env = L1BatchEnv::new();
-/// let system_env = SystemEnv::default();
-/// // Create storage
-/// let storage = Rc::new(RefCell::new(StorageView::new(InMemoryStorage::default())));
-/// // Instantiate VM with the desired version.
-/// let mut vm = multivm::vm_latest::Vm::new(l1_batch_env, system_env, storage);
-/// // Push a transaction to the VM.
-/// let tx = Transaction::default();
-/// vm.push_transaction(tx);
-/// // Instantiate a tracer.
-/// let result = Arc::new(OnceCell::new());
-/// let call_tracer = CallTracer::new(result.clone()).into_tracer_pointer();
-/// // Inspect the transaction with a tracer. You can use either one tracer or a vector of tracers.
-/// let result = vm.inspect(call_tracer.into(), multivm::interface::VmExecutionMode::OneTx);
-///
-/// // To obtain the result of the entire batch, you can use the following code:
-/// let result = vm.execute(multivm::interface::VmExecutionMode::Batch);
-/// ```
+//! This module contains traits for the VM interface.
+//! All VMs should implement these traits to be used in our system.
+//! The trait is generic over the storage type, allowing it to be used with any storage implementation.
+//! Additionally, this trait is generic over HistoryMode, allowing it to be used with or without history.
+//!
+//! `TracerDispatcher` is an associated type used to dispatch tracers in VMs.
+//! It manages tracers across different VM versions.
+//! Even though we use the same interface for all VM versions,
+//! we can now specify only the necessary trait bounds for each VM version.
+//!
+//! Generally speaking, in most cases, the tracer dispatcher is a wrapper around `Vec<Box<dyn VmTracer>>`,
+//! where `VmTracer` is a trait implemented for a specific VM version.
+//!
+//! Example usage:
+//! ```
+//! use std::{
+//!     cell::RefCell,
+//!     rc::Rc,
+//!     sync::Arc
+//! };
+//! use once_cell::sync::OnceCell;
+//! use multivm::{
+//!     interface::{L1BatchEnv, SystemEnv, VmInterface},
+//!     tracers::CallTracer ,
+//!     vm_latest::ToTracerPointer
+//! };
+//! use zksync_state::{InMemoryStorage, StorageView};
+//! use zksync_types::Transaction;
+//!
+//! // Prepare the environment for the VM.
+//! let l1_batch_env = L1BatchEnv::new();
+//! let system_env = SystemEnv::default();
+//! // Create storage
+//! let storage = Rc::new(RefCell::new(StorageView::new(InMemoryStorage::default())));
+//! // Instantiate VM with the desired version.
+//! let mut vm = multivm::vm_latest::Vm::new(l1_batch_env, system_env, storage);
+//! // Push a transaction to the VM.
+//! let tx = Transaction::default();
+//! vm.push_transaction(tx);
+//! // Instantiate a tracer.
+//! let result = Arc::new(OnceCell::new());
+//! let call_tracer = CallTracer::new(result.clone()).into_tracer_pointer();
+//! // Inspect the transaction with a tracer. You can use either one tracer or a vector of tracers.
+//! let result = vm.inspect(call_tracer.into(), multivm::interface::VmExecutionMode::OneTx);
+//!
+//! // To obtain the result of the entire batch, you can use the following code:
+//! let result = vm.execute(multivm::interface::VmExecutionMode::Batch);
+//! ```
+
 use crate::interface::types::errors::BytecodeCompressionError;
 use crate::interface::types::inputs::{L1BatchEnv, L2BlockEnv, SystemEnv, VmExecutionMode};
 use crate::interface::types::outputs::{

core/lib/multivm/src/tracers/call_tracer/mod.rs

@@ -5,11 +5,12 @@ use zksync_types::vm_trace::Call;
 pub mod vm_latest;
 pub mod vm_virtual_blocks;
 
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone)]
 pub struct CallTracer {
     stack: Vec<FarcallAndNearCallCount>,
-    result: Option<Arc<OnceCell<Vec<Call>>>>,
+    result: Arc<OnceCell<Vec<Call>>>,
 }
+
 #[derive(Debug, Clone)]
 struct FarcallAndNearCallCount {
     farcall: Call,
@@ -20,7 +21,7 @@ impl CallTracer {
     pub fn new(result: Arc<OnceCell<Vec<Call>>>) -> Self {
         Self {
             stack: vec![],
-            result: Some(result),
+            result,
         }
     }
 
@@ -32,11 +33,8 @@ impl CallTracer {
     }
 
     fn store_result(&mut self) {
-        if self.result.is_none() {
-            return;
-        }
         let result = self.extract_result();
-        let cell = self.result.as_ref().unwrap();
+        let cell = self.result.as_ref();
         cell.set(result).unwrap();
     }
 }

core/lib/multivm/src/tracers/validator/vm_latest/mod.rs

@@ -26,9 +26,6 @@ use crate::tracers::validator::{ValidationRoundResult, ValidationTracer};
 
 use crate::vm_latest::{BootloaderState, ZkSyncVmState};
 
-/// Tracer that is used to ensure that the validation adheres to all the rules
-/// to prevent DDoS attacks on the server.
-
 impl<H: HistoryMode> ValidationTracer<H> {
     fn check_user_restrictions_vm_latest<S: WriteStorage>(
         &mut self,

core/lib/multivm/src/tracers/validator/vm_virtual_blocks/mod.rs

@@ -22,8 +22,6 @@ use crate::interface::VmExecutionResultAndLogs;
 use crate::tracers::validator::types::{NewTrustedValidationItems, ValidationTracerMode};
 use crate::tracers::validator::{ValidationRoundResult, ValidationTracer};
 
-/// Tracer that is used to ensure that the validation adheres to all the rules
-/// to prevent DDoS attacks on the server.
 impl<H: HistoryMode> ValidationTracer<H> {
     fn check_user_restrictions_vm_virtual_blocks<S: WriteStorage>(
         &mut self,

core/lib/multivm/src/versions/vm_latest/tracers/dispatcher.rs

@@ -86,6 +86,7 @@ impl<S: WriteStorage, H: HistoryMode> VmTracer<S, H> for TracerDispatcher<S, H>
             tracer.initialize_tracer(_state);
         }
     }
+
     /// Run after each vm execution cycle
     #[inline(always)]
     fn finish_cycle(
@@ -99,6 +100,7 @@ impl<S: WriteStorage, H: HistoryMode> VmTracer<S, H> for TracerDispatcher<S, H>
         }
         result
     }
+
     /// Run after the vm execution
     fn after_vm_execution(
         &mut self,

core/lib/multivm/src/versions/vm_virtual_blocks/tracers/dispatcher.rs

@@ -93,6 +93,7 @@ impl<S: WriteStorage, H: HistoryMode> ExecutionProcessing<S, H> for TracerDispat
             tracer.initialize_tracer(_state);
         }
     }
+
     /// Run after each vm execution cycle
     fn after_cycle(
         &mut self,