feat: vm2 call tracer

core/lib/multivm/Cargo.toml

@@ -46,3 +46,4 @@ rand.workspace = true
 test-casing.workspace = true
 zksync_test_account.workspace = true
 zksync_eth_signer.workspace = true
+serde_json.workspace = true

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

@@ -17,6 +17,8 @@ pub mod vm_virtual_blocks;
 #[derive(Debug, Clone)]
 pub struct CallTracer {
     stack: Vec<FarcallAndNearCallCount>,
+    finished_calls: Vec<Call>,
+
     result: Arc<OnceCell<Vec<Call>>>,
 
     max_stack_depth: usize,
@@ -41,6 +43,7 @@ impl CallTracer {
     pub fn new(result: Arc<OnceCell<Vec<Call>>>) -> Self {
         Self {
             stack: vec![],
+            finished_calls: vec![],
             result,
             max_stack_depth: 0,
             max_near_calls: 0,

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

@@ -67,7 +67,9 @@ impl<S: WriteStorage, H: HistoryMode> VmTracer<S, H> for CallTracer {
         _bootloader_state: &BootloaderState,
         _stop_reason: VmExecutionStopReason,
     ) {
-        self.store_result()
+        let result = std::mem::take(&mut self.finished_calls);
+        let cell = self.result.as_ref();
+        cell.set(result).unwrap();
     }
 }
 
@@ -191,15 +193,14 @@ impl CallTracer {
             .farcall
             .parent_gas
             .saturating_sub(state.vm_local_state.callstack.current.ergs_remaining as u64);
-
         self.save_output_latest(state, memory, ret_opcode, &mut current_call.farcall);
 
         // If there is a parent call, push the current call to it
         // Otherwise, push the current call to the stack, because it's the top level call
         if let Some(parent_call) = self.stack.last_mut() {
             parent_call.farcall.calls.push(current_call.farcall);
         } else {
-            self.push_call_and_update_stats(current_call.farcall, current_call.near_calls_after);
+            self.finished_calls.push(current_call.farcall);
         }
     }
 }