feat: integrate spar (AADL→WIT) and witness (MC/DC coverage)#467
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Adds spar (pulseengine/spar v0.9.3) as a first-class toolchain and rule.
spar generates WIT interfaces from AADL v2.3 architecture models — the front
of the PulseEngine certification pipeline (see docs/certification-pipeline.md).
- checksums/tools/spar.json — JSON registry entry, 5 platforms, verified SHA256
- toolchains/tool_registry.bzl — spar URL pattern (archive: spar-v{version}-{triple})
- toolchains/spar_toolchain.bzl + toolchains/BUILD.bazel — spar_toolchain_type
- wasm/extensions.bzl — spar module extension
- MODULE.bazel — register the spar toolchain
- wasm/private/aadl_wit_library.bzl — the aadl_wit_library rule: runs
`spar codegen --format wit`, emits the generated WIT as a tree artifact
- wasm/defs.bzl — export aadl_wit_library
- examples/spar_example — AADL building-control model -> generated WIT
Validated: //examples/spar_example:building_control_wit builds — spar 0.9.3
downloads checksum-verified, codegen produces wit/tcp.wit from the model.
Part of the tool-integration track (rivet DD-003); witness is next.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds witness (pulseengine/witness v0.22.0) as a first-class toolchain and rule. witness measures MC/DC-style branch coverage of WebAssembly core modules — the verification stage of the PulseEngine certification pipeline. - checksums/tools/witness.json — JSON registry entry, 5 platforms, verified SHA256 - toolchains/tool_registry.bzl — witness URL pattern - toolchains/witness_toolchain.bzl + toolchains/BUILD.bazel — witness_toolchain_type - wasm/extensions.bzl — witness module extension - MODULE.bazel — register the witness toolchain - wasm/private/wasm_module_coverage.bzl — the wasm_module_coverage rule: a three-stage witness pipeline (instrument -> run -> lcov). Consumes a core module; accepts meld_fuse's MeldFusedInfo provider or a plain .wasm. - wasm/defs.bzl — export wasm_module_coverage - examples/witness_example — coverage of a minimal core module Validated: //examples/witness_example:coverage_demo_coverage builds — witness 0.22.0 downloads checksum-verified, and instrument/run/lcov all execute (4 actions). The demo module carries no DWARF, so its LCOV report is structural only; a DWARF-bearing subject is needed for source-level MC/DC data (noted in the example). witness operates on core modules, not components — meld_fuse is the bridge that produces its input. Part of the tool-integration track (rivet DD-003). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Integrates two PulseEngine pipeline tools as first-class hermetic Bazel
rules, following the JSON-registry download pattern. This is the
tool-integration track recorded as rivet
DD-003; seedocs/certification-pipeline.mdfor where these sit in the pipeline.spar —
aadl_wit_library(commit 1)Generates WIT interfaces from an AADL v2.3 architecture model — the front of
the pipeline.
spar codegen --format witemits one.witper AADLprocessas a tree artifact.
checksums/tools/spar.json,tool_registry.bzlURL patternspar_toolchain.bzl+spar_toolchain_type,sparmodule extensionwasm/private/aadl_wit_library.bzl, exported fromwasm/defs.bzlexamples/spar_example— AADL building-control model → generated WITValidated:
//examples/spar_example:building_control_witbuilds; spar0.9.3 downloads checksum-verified and produces a real
wit/tcp.wit.Note: with
--format wit, spar still also emits Rust scaffolding into theoutput dir — captured harmlessly by the tree artifact; strict WIT-only output
is a possible spar-flag follow-up.
witness —
wasm_module_coverage(commit 2)Measures MC/DC-style branch coverage of a WASM core module — the
verification stage. Runs a three-stage pipeline:
instrument → run → lcov.checksums/tools/witness.json,tool_registry.bzlURL patternwitness_toolchain.bzl+witness_toolchain_type,witnessmodule extensionwasm/private/wasm_module_coverage.bzl, exported fromwasm/defs.bzlexamples/witness_example— coverage of a minimal core moduleValidated:
//examples/witness_example:coverage_demo_coveragebuilds;witness 0.22.0 downloads checksum-verified and instrument/run/lcov all
execute. Note: witness operates on core modules, not components — its input
is meld's
MeldFusedInfo(the same providersynth_compileconsumes). Thedemo module has no DWARF, so its LCOV report is structural only; meaningful
source-level MC/DC needs a debug-info subject (noted in the example).
synthis intentionally not included — it has no published releases yet(rivet
DD-003).🤖 Generated with Claude Code