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feat: add Rust dynamic call-graph tracer (dyn dispatch capture) - #1275
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📝 WalkthroughWalkthroughRust dynamic tracing now supports gzipped Rust pprof conversion. The CLI accepts explicit language selection, the converter normalizes and filters Rust frames, ingestion resolves Rust calls, and tests and documentation cover the flow. ChangesRust trace support
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This PR adds Rust dynamic call-graph tracing and integrates it with conversion, ingestion, CLI handling, and documentation; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant User
participant TraceCLI
participant RustPprof
participant SharedPprofConverter
participant TraceIngest
participant CodeGraph
User->>TraceCLI: convert --language rust
TraceCLI->>RustPprof: convert_rust_pprof(profile, repo, output, workload)
RustPprof->>SharedPprofConverter: decode profile and build Rust frames
SharedPprofConverter-->>RustPprof: write sampled trace records
TraceIngest->>CodeGraph: resolve Rust frames and create runtime edges
Possibly related PRs
Suggested labels: 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@codebase_rag/trace/rust_pprof.py`:
- Around line 17-19: Update the profile-setting guidance near the traced-build
discussion: describe opt-level = 0 as disabling optimizations that may reduce
inlining, and describe debug = true as enabling full debug information rather
than as an inlining control.
- Line 3: Update the pprof-rs producer description and matching comments to
state that pprof-rs writes pprof protobuf output, typically uncompressed, with
gzip optional; remove the incorrect attribution to cargo flamegraph, perf, or
DTrace.
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Fix all unresolved CodeRabbit comments on this PR:
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Run ID: 4ade2c9a-f7e4-437a-a502-f197090cc6cf
📒 Files selected for processing (10)
codebase_rag/cli_help.pycodebase_rag/constants/trace.pycodebase_rag/tests/test_dynamic_trace_cli.pycodebase_rag/tests/test_dynamic_trace_ingest.pycodebase_rag/tests/test_dynamic_trace_records.pycodebase_rag/tests/test_dynamic_trace_rust.pycodebase_rag/trace/cli.pycodebase_rag/trace/ingest.pycodebase_rag/trace/rust_pprof.pydocs/guide/dynamic-tracing.md
Greptile SummaryAdds Rust pprof CPU-profile conversion and graph ingestion support, including Rust symbol normalization, repository-scoped frame extraction, sampled-edge metadata, and the An executable conversion-to-ingestion check generated gzipped pprof inputs and confirmed leaf-first stack handling, sample-weight accumulation, repository and A suspected v0 Rust closure normalization failure was disproved by execution: Confidence Score: 5/5The Rust tracing addition is safe to merge based on the exercised conversion and ingestion behavior. The executable check covered profile decoding, frame scoping, Rust symbol handling, sampled edge accumulation, and graph resolution, and found no defects. Files Needing Attention: No files require follow-up changes.
 T-Rex LogsWhat T-Rex did
Reviews (1): Last reviewed commit: "docs: fix Rust trace recipe (Message imp..." | Re-trigger Greptile |
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@coderabbitai Both corrected in 5b93eeb (docstring accuracy):
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
git show --no-ext-diff --format=fuller --stat 5b93eeb2
printf '\n--- Focused documentation diff ---\n'
git show --no-ext-diff --format= --unified=20 5b93eeb2 -- docs/guide/dynamic-tracing.mdLength of output: 815 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- Commit diff ---'
git show --no-ext-diff --format= --unified=25 5b93eeb2 -- codebase_rag/trace/rust_pprof.py
printf '%s\n' '--- Current module header ---'
sed -n '1,130p' codebase_rag/trace/rust_pprof.pyLength of output: 7942
The The profile guidance now correctly identifies ✏️ Learnings added
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… the complexity gate (#1251)
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What
Adds a dynamic call-graph tracer for Rust, the last runtime in the epic (#1244) with no tracer.
pprof-rs/cargo flamegraphwrite gzipped protobuf CPU profiles in the same wire format as Go, so this reuses the Go pprof decoder and accumulation and adds only Rust-specific symbol demangling and scoping.Why
Static analysis already resolves monomorphised Rust calls, so the dynamic payoff is narrower but real:
dyn Traitdispatch, function pointers, and closures routed across boundaries. This closes #1251.Approach
codebase_rag/trace/rust_pprof.py:convert_rust_pprofreuses_decompress/_decode_profile/_accumulate_edgesfrompprof.py; a Rust_bare_namestrips the legacy::h<hash>, splits paths at angle/paren depth zero so<Dog as Animal>::speakyieldsspeak, drops trailing turbofish (fn::<u32>->fn), collapses generic instantiations, and marks{{closure}}anonymous. Frames outside the repo and undertarget/are seen through to the nearest project frame. The header is taggedsampled=True(pprof-rs samples).JsFrameResolver(span-first, bare name + declaration line), so monomorphised instances resolve to their single generic source definition;ingest.pyaddsrustto that dispatch tuple.cgr trace convert --language rustselects the Rust demangler. Unknown--languagevalues are rejected.Tests
dyn Traitdispatch edge captured through an intervening std frame,target/+stdlib frames out of scope, closures/generics normalised,_bare_namedemangling table, workload labelling, malformed-profile rejection.dynamic_sampled+static_missed.--language rustroutes to the Rust converter (and needs--repo-path); unknown language rejected. Plus theTRACE_LANGUAGE_RUSTconstant assertion.Closes #1251. Refs #1244.
(Supersedes #1274, which GitHub auto-closed when its stacked base branch was deleted on merge of #1273. Rebased onto main; the
sampledflag it uses is already merged.)Summary by CodeRabbit
New Features
pprofprofiles.Documentation
Bug Fixes