feat(tracer): Implement txGasDimensionLogger and txGasDimensionByOpcode custom tracers#554
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txGasDimensionLogger and txGasDimensionByOpcode custom tracers
This was referenced Jan 14, 2026
feat(tracing): enable external tracer registration and VM inheritance
NethermindEth/nethermind#10228
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Pull request overview
This PR implements two custom tracers for multi-dimensional gas analysis in Arbitrum: txGasDimensionLogger for per-opcode gas dimension breakdown and txGasDimensionByOpcode for aggregated gas analysis by opcode type. These tracers enable detailed tracking of gas consumption across different resource dimensions (computation, storage access, storage growth, and history growth).
Changes:
- Added
TxGasDimensionLoggerTracerandTxGasDimensionByOpcodeTracerfor multi-dimensional gas tracking - Enhanced
IArbitrumTxTracerinterface with gas dimension capture methods - Modified
ArbitrumVirtualMachineto capture gas dimensions during bytecode execution - Updated
ArbitrumTransactionProcessorto track intrinsic and poster gas for dimension tracers
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| File | Description |
|---|---|
| src/Nethermind.Arbitrum/Tracing/TxGasDimensionLoggerTracer.cs | Implements per-opcode gas dimension logger tracer with detailed breakdown |
| src/Nethermind.Arbitrum/Tracing/TxGasDimensionByOpcodeTracer.cs | Implements aggregated gas dimension tracer grouped by opcode type |
| src/Nethermind.Arbitrum/Tracing/IArbitrumTxTracer.cs | Adds gas dimension tracing interface methods |
| src/Nethermind.Arbitrum/Properties/scripts/generate-system-test-config.sh | Fixes file paths for accounts and chainspec template |
| src/Nethermind.Arbitrum/Execution/ArbitrumTransactionProcessor.cs | Captures intrinsic and poster gas for dimension tracers |
| src/Nethermind.Arbitrum/Evm/ArbitrumVirtualMachine.cs | Implements gas dimension capture during bytecode execution |
| src/Nethermind.Arbitrum/ArbitrumPlugin.cs | Registers the new tracers with the factory |
| src/Nethermind.Arbitrum.Test/Tracing/TxGasDimensionLoggerTracerTests.cs | Unit tests for the dimension logger tracer |
| src/Nethermind.Arbitrum.Test/Tracing/TxGasDimensionByOpcodeTracerTests.cs | Unit tests for the by-opcode dimension tracer |
| src/Nethermind.Arbitrum.Test/Tracing/GasDimensionTracerIntegrationTests.cs | Integration tests for both tracers |
| src/Nethermind.Arbitrum.Test/Tracing/GasDimensionSerializationTests.cs | Tests for JSON serialization of gas dimension data |
| src/Nethermind | Submodule update to support new functionality |
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wurdum
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src/Nethermind.Arbitrum.Test/Tracing/GasDimensionSerializationTests.cs
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src/Nethermind.Arbitrum.Test/Tracing/GasDimensionSerializationTests.cs
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…ode tracers Add Arbitrum-specific gas dimension tracers matching Nitro's implementation: - txGasDimensionLogger: Per-opcode gas dimension breakdown (pc, op, depth, cost, cpu, rw, growth, hist) - txGasDimensionByOpcode: Aggregated gas dimensions by opcode type Implementation details: - Extend IArbitrumTxTracer with gas dimension capture interface - Add RunByteCodeWithGasDimensionCapture to ArbitrumVirtualMachine for before/after MultiGas snapshots - Capture intrinsic gas and poster gas in ArbitrumTransactionProcessor - Register tracers in ArbitrumPlugin initialization - Fix tracer unwrapping to use GetTracer<T>() for proper wrapper handling
PR #550 introduced naming mismatches between the script defaults and actual file names: - Template path: chainspec.template → system-test-chainspec.template - Accounts default: default.json → defaults.json These mismatches caused the script to fail when invoked via `make generate-system-test-config` or directly.
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Fixes #556
Implement
txGasDimensionLoggerandtxGasDimensionByOpcodecustom tracers for multi-dimensional gas analysisDependencies