refactor: improve ProcessSpecialTxsInBlock's readability a bit

[UdjinM6]

Issue being fixed or feature implemented

Builds on top of #6767

What was done?

How Has This Been Tested?

Breaking Changes

n/a

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

[github-actions]

✅ No Merge Conflicts Detected

This PR currently has no conflicts with other open PRs.

[github-actions]

This pull request has conflicts, please rebase.

[coderabbitai]

Walkthrough

This change set removes the CheckCbTxMerkleRoots function from both its implementation and header files, eliminating the direct Merkle root verification of quorum commitments in coinbase transactions from cbtx.cpp and cbtx.h. In specialtxman.cpp, the code refactors timing and benchmarking variables for special transaction processing, renames timing variables for clarity, and introduces new logic to calculate and verify the quorum Merkle root in coinbase transactions when applicable. Additional timing instrumentation is added around the new quorum Merkle root verification and existing chainlock checks, while no changes are made to public API signatures.

Estimated code review effort

2 (~15 minutes)

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between f648039 and fc331e3.

📒 Files selected for processing (3)

• src/evo/cbtx.cpp (0 hunks)
• src/evo/cbtx.h (0 hunks)
• src/evo/specialtxman.cpp (2 hunks)

📓 Path-based instructions (2)

src/**/*.{cpp,h,cc,cxx,hpp}

📄 CodeRabbit Inference Engine (CLAUDE.md)

src/**/*.{cpp,h,cc,cxx,hpp}: Dash Core C++ codebase must be written in C++20 and require at least Clang 16 or GCC 11.1
Dash uses unordered_lru_cache for efficient caching with LRU eviction

Files:

• src/evo/specialtxman.cpp

src/{masternode,evo}/**/*.{cpp,h,cc,cxx,hpp}

📄 CodeRabbit Inference Engine (CLAUDE.md)

Masternode lists must use immutable data structures (Immer library) for thread safety

Files:

• src/evo/specialtxman.cpp

🧠 Learnings (2)

📓 Common learnings

Learnt from: kwvg
PR: dashpay/dash#6543
File: src/wallet/receive.cpp:240-251
Timestamp: 2025-02-06T14:34:30.466Z
Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.

Learnt from: kwvg
PR: dashpay/dash#6718
File: test/functional/test_framework/test_framework.py:2102-2102
Timestamp: 2025-06-09T16:43:20.996Z
Learning: In the test framework consolidation PR (#6718), user kwvg prefers to limit functional changes to those directly related to MasternodeInfo, avoiding scope creep even for minor improvements like error handling consistency.

Learnt from: knst
PR: dashpay/dash#6533
File: test/functional/feature_llmq_singlenode.py:98-106
Timestamp: 2025-01-22T08:33:31.405Z
Learning: When reviewing PRs, ensure that suggestions are directly related to the PR's primary objectives rather than general code improvements that could be addressed separately.

Learnt from: CR
PR: dashpay/dash#0
File: CLAUDE.md:0-0
Timestamp: 2025-07-20T18:42:49.794Z
Learning: Applies to src/{crc32c,dashbls,gsl,immer,leveldb,minisketch,secp256k1,univalue}/** : Do not make changes under any circumstances to vendored dependencies in src/crc32c, src/dashbls, src/gsl, src/immer, src/leveldb, src/minisketch, src/secp256k1, src/univalue

src/evo/specialtxman.cpp (6)

Learnt from: kwvg
PR: #6718
File: test/functional/test_framework/test_framework.py:2102-2102
Timestamp: 2025-06-09T16:43:20.996Z
Learning: In the test framework consolidation PR (#6718), user kwvg prefers to limit functional changes to those directly related to MasternodeInfo, avoiding scope creep even for minor improvements like error handling consistency.

Learnt from: CR
PR: dashpay/dash#0
File: CLAUDE.md:0-0
Timestamp: 2025-07-20T18:42:49.794Z
Learning: Applies to src/evo/specialtx.h : Special transactions use payload extensions defined in src/evo/specialtx.h

Learnt from: kwvg
PR: #6543
File: src/wallet/receive.cpp:240-251
Timestamp: 2025-02-06T14:34:30.466Z
Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.

Learnt from: knst
PR: #6511
File: src/evo/deterministicmns.cpp:1369-1373
Timestamp: 2025-01-07T18:50:44.838Z
Learning: The functions MigrateDBIfNeeded and MigrateDBIfNeeded2 in src/evo/deterministicmns.cpp are temporary and will be removed in a future version. Refactoring suggestions for these functions should be avoided.

Learnt from: kwvg
PR: #6729
File: src/evo/deterministicmns.cpp:1313-1316
Timestamp: 2025-07-09T15:02:26.899Z
Learning: In Dash's masternode transaction validation, IsVersionChangeValid() is only called by transaction types that update existing masternode entries (like ProUpServTx, ProUpRegTx, ProUpRevTx), not by ProRegTx which creates new entries. This means validation logic in IsVersionChangeValid() only applies to the subset of transaction types that actually call it, not all masternode transaction types.

Learnt from: knst
PR: #6691
File: src/test/llmq_params_tests.cpp:148-151
Timestamp: 2025-07-15T14:53:04.819Z
Learning: In the Dash Core LLMQ implementation, signingActiveQuorumCount is never 0 in the actual parameters defined in params.h, making division by zero scenarios unrealistic in the max_cycles() function.

💤 Files with no reviewable changes (2)

• src/evo/cbtx.cpp
• src/evo/cbtx.h

🧰 Additional context used

📓 Path-based instructions (2)

src/**/*.{cpp,h,cc,cxx,hpp}

📄 CodeRabbit Inference Engine (CLAUDE.md)

src/**/*.{cpp,h,cc,cxx,hpp}: Dash Core C++ codebase must be written in C++20 and require at least Clang 16 or GCC 11.1
Dash uses unordered_lru_cache for efficient caching with LRU eviction

Files:

• src/evo/specialtxman.cpp

src/{masternode,evo}/**/*.{cpp,h,cc,cxx,hpp}

📄 CodeRabbit Inference Engine (CLAUDE.md)

Masternode lists must use immutable data structures (Immer library) for thread safety

Files:

• src/evo/specialtxman.cpp

🧠 Learnings (2)

📓 Common learnings

Learnt from: kwvg
PR: dashpay/dash#6543
File: src/wallet/receive.cpp:240-251
Timestamp: 2025-02-06T14:34:30.466Z
Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.

Learnt from: kwvg
PR: dashpay/dash#6718
File: test/functional/test_framework/test_framework.py:2102-2102
Timestamp: 2025-06-09T16:43:20.996Z
Learning: In the test framework consolidation PR (#6718), user kwvg prefers to limit functional changes to those directly related to MasternodeInfo, avoiding scope creep even for minor improvements like error handling consistency.

Learnt from: knst
PR: dashpay/dash#6533
File: test/functional/feature_llmq_singlenode.py:98-106
Timestamp: 2025-01-22T08:33:31.405Z
Learning: When reviewing PRs, ensure that suggestions are directly related to the PR's primary objectives rather than general code improvements that could be addressed separately.

Learnt from: CR
PR: dashpay/dash#0
File: CLAUDE.md:0-0
Timestamp: 2025-07-20T18:42:49.794Z
Learning: Applies to src/{crc32c,dashbls,gsl,immer,leveldb,minisketch,secp256k1,univalue}/** : Do not make changes under any circumstances to vendored dependencies in src/crc32c, src/dashbls, src/gsl, src/immer, src/leveldb, src/minisketch, src/secp256k1, src/univalue

src/evo/specialtxman.cpp (6)

Learnt from: kwvg
PR: #6718
File: test/functional/test_framework/test_framework.py:2102-2102
Timestamp: 2025-06-09T16:43:20.996Z
Learning: In the test framework consolidation PR (#6718), user kwvg prefers to limit functional changes to those directly related to MasternodeInfo, avoiding scope creep even for minor improvements like error handling consistency.

Learnt from: CR
PR: dashpay/dash#0
File: CLAUDE.md:0-0
Timestamp: 2025-07-20T18:42:49.794Z
Learning: Applies to src/evo/specialtx.h : Special transactions use payload extensions defined in src/evo/specialtx.h

Learnt from: kwvg
PR: #6543
File: src/wallet/receive.cpp:240-251
Timestamp: 2025-02-06T14:34:30.466Z
Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.

Learnt from: knst
PR: #6511
File: src/evo/deterministicmns.cpp:1369-1373
Timestamp: 2025-01-07T18:50:44.838Z
Learning: The functions MigrateDBIfNeeded and MigrateDBIfNeeded2 in src/evo/deterministicmns.cpp are temporary and will be removed in a future version. Refactoring suggestions for these functions should be avoided.

Learnt from: kwvg
PR: #6729
File: src/evo/deterministicmns.cpp:1313-1316
Timestamp: 2025-07-09T15:02:26.899Z
Learning: In Dash's masternode transaction validation, IsVersionChangeValid() is only called by transaction types that update existing masternode entries (like ProUpServTx, ProUpRegTx, ProUpRevTx), not by ProRegTx which creates new entries. This means validation logic in IsVersionChangeValid() only applies to the subset of transaction types that actually call it, not all masternode transaction types.

Learnt from: knst
PR: #6691
File: src/test/llmq_params_tests.cpp:148-151
Timestamp: 2025-07-15T14:53:04.819Z
Learning: In the Dash Core LLMQ implementation, signingActiveQuorumCount is never 0 in the actual parameters defined in params.h, making division by zero scenarios unrealistic in the max_cycles() function.

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

• GitHub Check: linux64_ubsan-test / Test source
• GitHub Check: linux64_tsan-test / Test source
• GitHub Check: linux64_multiprocess-build / Build source

🔇 Additional comments (8)

src/evo/specialtxman.cpp (8)

502-502: Good naming improvement for clarity.

Renaming nTimeMerkle to nTimeMerkleQuorums makes the timing variable's purpose more explicit and distinguishes it from the MN list merkle root timing.

---

604-606: Timing consolidation looks correct.

The timing variable consolidation maintains accurate timing measurements for the DMN manager processing while improving code organization.

---

609-621: Good variable naming and timing improvements.

The rename to calculatedMerkleRootMNL makes the variable's purpose explicit, and the timing measurements are correctly implemented to track the MN list merkle root calculation performance.

---

623-632: Correct inline implementation of quorum merkle root verification.

The logic correctly replaces the removed CheckCbTxMerkleRoots function by implementing the quorum merkle root verification inline. The version check, calculation, and comparison maintain the same validation behavior while improving code organization.

---

634-638: Proper timing instrumentation for the new inline logic.

The timing measurements correctly track the performance of the quorum merkle root verification that was moved inline, maintaining the same level of performance monitoring as before.

---

644-648: Correct timing update for chainlock processing.

The timing measurements are properly updated to maintain accurate performance tracking of the chainlock verification while fitting into the improved timing organization.

---

651-660: Timing consolidation maintains accuracy.

The timing variable updates for the MN hardfork manager processing maintain correct performance measurements while fitting into the improved timing organization structure.

---

502-660: Excellent refactoring that improves code organization and readability.

This refactoring successfully achieves the stated goal of improving ProcessSpecialTxsInBlock's readability by:

1. Consolidating related logic: Moving quorum merkle root verification inline eliminates the need for a separate function and keeps related validation logic together
2. Improving variable naming: Renaming nTimeMerkle to nTimeMerkleQuorums and calculatedMerkleRootMNL makes the code more self-documenting
3. Better timing organization: Consolidating timing variables provides clearer performance tracking granularity
4. Maintaining functionality: All validation behavior remains identical while improving code structure

The implementation correctly preserves all timing measurements and validation logic while making the code more maintainable.

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• 📝 Generate Docstrings

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[knst]

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