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feat(wasm): LABELLE_WASM_THREADS generates a threaded web build (labelle-web#24) - #818
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…lle-web#24) A per-generation opt-in, shaped exactly like editor_preview: LABELLE_WASM_THREADS=1 or --wasm-threads sets ProjectConfig.wasm_threads, normalized OFF on every non-wasm platform. On a threaded generation the generated wasm build.zig: - adds atomics + bulk_memory to the wasm32-emscripten target (shared memory needs them on every object; emcc can't add them at link time) - walks the module graph after the backend archives are linked and sets single_threaded = false everywhere (Zig defaults wasm to single-threaded even with +atomics) - passes .wasm_threads = true to the backend hook's post_wire, which links emcc -pthread (labelle-bgfx#199) Without the flag the output is byte-identical. End to end through the CLI (local bgfx#199 + this branch): the threaded build ran a std.Thread worker for 1.6 s while the game rendered 184 frames (Chromium, COOP/COEP); the plain build stays single-threaded. Claude-Session: https://claude.ai/code/session_01LpszrcSrLLijQcxxvgWyUQ
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Included review availability: This review used your included allowance. 0 included reviews remain after this review. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. 📝 WalkthroughWalkthroughGeneration accepts an optional WebAssembly threads setting through the CLI or environment. For WebAssembly targets, code generation uses the setting to emit threading features and module wiring. Project configuration rejects ChangesThreaded WebAssembly Generation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant cmdGenerate
participant generate
participant normalizeWasmThreads
participant Environment
participant build_zig
participant renderWasmHeaderV2
cmdGenerate->>generate: pass ProjectConfig
generate->>normalizeWasmThreads: normalize mutable config
opt Setting is not enabled and target is WebAssembly
normalizeWasmThreads->>Environment: read LABELLE_WASM_THREADS
end
generate->>build_zig: use normalized config
build_zig->>renderWasmHeaderV2: pass cfg.wasm_threads
Merge Risk: ⚪ Minimal · up to The wasm-only opt-in and single-thread fallback are wired consistently. No actionable merge risk was found; threaded builds require the compatible backend hook described by the project. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
Review comments at @src/config.zig:
- Line 1405: Update parseProjectConfig to reject a project.labelle configuration
that specifies .wasm_threads, rather than passing that field through to
ProjectConfig parsing. Preserve wasm-thread activation through the existing
environment and CLI paths, including applyWasmThreads behavior for those
sources.
Review comments at @src/main.zig:
- Around line 261-265: Add --wasm-threads to the reachable CLI help output
alongside --editor-preview, and state that it enables threaded wasm builds and
is ignored on other platforms.
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src/build_files/build_zig.zigsrc/codegen/manifest_v2.zigsrc/codegen/manifest_v2_splice/wasm.zigsrc/config.zigsrc/main.zigsrc/root.zigsrc/root/generate_phases.zig
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…threaded A threaded generation now declares b.option(bool, "wasm_threads") (default true) and gates the target features, the module walk and the hook's .wasm_threads on it at configure time. The web provider's export can then build the non-isolated fallback from the SAME generated tree with zig build -Dwasm_threads=false (its hook context has zig_executable and target_dir but no assembler), instead of regenerating. A plain generation is still byte-identical. E2E: one LABELLE_WASM_THREADS=1 generation -> default compile runs a worker thread (isolated); -Dwasm_threads=false -> different wasm that runs single-threaded on a non-isolated page. Claude-Session: https://claude.ai/code/session_01LpszrcSrLLijQcxxvgWyUQ
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Pushed Why: the owner decided that export ships both variants (labelle-web#24). The web provider's export hook has End to end (local CLI + bgfx#199): one
Tests still pass: 94/94 steps, 3839 passed, 16 skipped. |
…hreads CodeRabbit on #818: .wasm_threads is per-generation (env / flag, set by the web provider). In project.labelle it would generate a threaded build behind the provider's back (no COOP/COEP, no fallback), so parseProjectConfig now rejects it with where to turn threads on instead. --help lists --wasm-threads. Claude-Session: https://claude.ai/code/session_01LpszrcSrLLijQcxxvgWyUQ
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Step 2 of the labelle-web#24 implementation design: labelle-toolkit/labelle-web#24 (comment). It pairs with labelle-bgfx#199, the hook half.
What changes
A per-generation opt-in, shaped exactly like
editor_preview:LABELLE_WASM_THREADS=1(the web provider's path) or--wasm-threads(direct) setsProjectConfig.wasm_threads, which is normalized OFF on every non-wasm platform.On a threaded generation, the generated wasm
build.zig:atomics+bulk_memoryto thewasm32-emscriptentarget. Shared memory needs them on every object, and emcc can't add them at link time.single_threaded = falseon every module (a local struct, emitted after thelinkLibrarycalls so the backend archives are reached throughlink_objects). Zig defaults wasm to single-threaded even with +atomics: the spike's first try had atomics and still compiled single-threaded..wasm_threads = truetopost_wire, which links emcc-pthread -sPTHREAD_POOL_SIZE=4(bgfx#199).Without the flag the output is byte-identical: the header splits its
printwithout changing bytes, and every addition is conditional.Needs: a backend hook whose
HookContextdeclareswasm_threads(bgfx#199) for threaded builds only. Likeeditor_preview, a too-old hook fails with "no field named 'wasm_threads'".Verified
zig build testpasses: 94/94 steps, 3839 passed, 16 skipped. New tests:applyWasmThreads: wasm-only, env or flaglinkLibraryand beforepost_wirelabelle initbgfx project with the web provider 0.3.2, pointed at this branch and the bgfx#199 branch):LABELLE_WASM_THREADS=1 labelle build --platform=wasm: the generated build has all 3 pieces, and astd.Threadworker ran 1.6 s of work while the game rendered 184 frames (Chromium, served with COOP/COEP).single_threaded.Next
Step 3 is labelle-web: the opt-in in the provider's config, the dual build (plain plus
LABELLE_WASM_THREADS=1), the loader picking the build at runtime, and COOP/COEP inserve.https://claude.ai/code/session_01LpszrcSrLLijQcxxvgWyUQ
Summary by CodeRabbit
--wasm-threadsor theLABELLE_WASM_THREADSenvironment setting (1ortrue).