surma
5ce2a2f2bd
Preview1 state lives in the host, so Go modules (esbuild) work. esbuild bundles byte-identical to native; uutils and QuickJS-ng file tests pass. The failed guest-side adapter attempt (T7) moves to spikes/s7-preview1-adapter/.
54 lines
2.4 KiB
Markdown
54 lines
2.4 KiB
Markdown
# Preview1 command adapter experiment
|
|
|
|
This directory tests D39 with Go esbuild, uutils, and QuickJS.
|
|
The patch reserves the adapter state before the guest calls `_start`.
|
|
It retains both state sentinels and all WASI semantics.
|
|
|
|
## Build
|
|
|
|
From the repository root:
|
|
|
|
```sh
|
|
nix develop -c nu spikes/s7-preview1-adapter/build.nu
|
|
nix develop -c nu spikes/s7-preview1-adapter/test.nu
|
|
```
|
|
|
|
The build pins Wasmtime v49.0.2 to commit
|
|
`3c8a3e79aa3188a1a12b3aebbaa097abccceac92` and uses its Cargo.lock with `--locked`.
|
|
The repository flake pins the Rust toolchain through flake.lock.
|
|
The build requires the `wasm32-unknown-unknown` standard library.
|
|
T11 removed this target from the production flake after T7 disproved the patch.
|
|
To repeat this historical experiment, supply that target in a separate Rust toolchain.
|
|
It places sources, a persistent target directory, and the adapter under `/tmp/p1-adapter/`.
|
|
|
|
The test uses the S6 esbuild v0.27.7 module at `/tmp/s6-esbuild/esbuild.wasm`.
|
|
The S6 build recipe can create this input.
|
|
The test copies the S6 fixture into its own scratch directory and installs its locked dependencies.
|
|
It compares module and component bundles byte-for-byte and checks rendered elements with LinkeDOM.
|
|
It also adapts the lab's preview1 uutils and QuickJS modules.
|
|
These smoke tests check command arguments and stdout.
|
|
They do not check every utility or JavaScript feature.
|
|
|
|
The test requires these existing lab inputs:
|
|
|
|
- `/tmp/wasi-userland-lab/uu/coreutils-0.12.0-wasm32-wasip1/coreutils.wasm`
|
|
- `/tmp/wasi-userland-lab/qjs-wasi.wasm`
|
|
|
|
## Result
|
|
|
|
The eager-state patch does not fix esbuild.
|
|
The component traps during `--version` after Go overwrites the adapter state sentinels.
|
|
The uutils and QuickJS smoke tests pass.
|
|
The task report records the sentinel addresses and values.
|
|
|
|
`diagnostic.patch` is an alternative patch against the same pristine Wasmtime revision.
|
|
It includes the eager-state change and prints state sentinels before `_start` and upon corruption.
|
|
It does not disable assertions.
|
|
Do not apply both patches to one source tree.
|
|
The diagnostic build uses the same Cargo command as the normal build.
|
|
Use `wasm-tools component new` with its resulting adapter to reproduce the trace.
|
|
|
|
The eager-state change does not reserve its memory from Go's allocator.
|
|
Go starts its allocation cursor at the end of its static data, not at the current memory size.
|
|
The host-side adapter is the next planned approach under D39.
|