collecting nonceChanges and codeChanges only when the tracer is enabled

[Eduard-Voiculescu]

Closes: #XXX

Description

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Summary by CodeRabbit

• New Features

  • Enhanced tracing functionality for nonce and code changes, improving the control flow and ensuring accuracy when the tracer is active.

• Bug Fixes

  • Improved logic for retrieving old nonce and code, ensuring correct data is passed to the tracer.

[coderabbitai]

Walkthrough

The changes focus on the SetNonce and SetCode methods within the StateDB struct in the statedb.go file. Modifications ensure that the retrieval of old nonce and old code is contingent upon the tracer's activity, enhancing control flow. The core functionality of setting the nonce and code remains unchanged, but the interaction with the tracer is streamlined to improve efficiency.

Changes

File Path	Change Summary
x/evm/statedb/statedb.go	Updated SetNonce and SetCode methods to conditionally retrieve old nonce and code based on tracer activity. No change in method signatures.

Poem

In the state of the blockchain, oh so bright,
The tracer hops in, ready for flight.
With nonce and code, it dances with glee,
Collecting the changes, so joyfully free!
A hop here, a skip there, all in a row,
The StateDB's magic continues to grow! 🐇✨

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[coderabbitai]

Actionable comments posted: 0

🧹 Outside diff range and nitpick comments (1)

x/evm/statedb/statedb.go (1)

565-574: LGTM with a minor optimization suggestion.

The implementation correctly optimizes the code change tracking by only retrieving the old code when the tracer is enabled and interested in code changes. However, there's a minor optimization opportunity:

Consider optimizing the old code hash calculation by checking for nil first:

 if s.evmTracer != nil && s.evmTracer.OnCodeChange != nil {
   oldCode := s.GetCode(addr)
   var oldCodeHash common.Hash
-  if oldCode != nil {
-    oldCodeHash = crypto.Keccak256Hash(oldCode)
-  }
+  oldCodeHash = crypto.Keccak256Hash(oldCode)
   s.evmTracer.OnCodeChange(addr, oldCodeHash, oldCode, crypto.Keccak256Hash(code), code)
 }

This avoids calculating the hash of nil code, which would result in the same empty hash.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between 8f05d8e and 642c6ba.

📒 Files selected for processing (1)

• x/evm/statedb/statedb.go (1 hunks)

🔇 Additional comments (1)

x/evm/statedb/statedb.go (1)

550-556: LGTM! Optimization for nonce change tracking.

The implementation correctly optimizes the nonce change tracking by only retrieving the old nonce when the tracer is enabled and interested in nonce changes. This aligns with the PR objective and maintains the core functionality.