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* wasm2go: a WebAssembly-to-Go ahead-of-time transpiler wasm2go translates a WebAssembly binary into standalone Go source. The generated package runs the module natively — no interpreter and no embedded wasm runtime — so it builds and links like ordinary Go code. This makes it practical to ship a wasm-compiled library (for example a large C/C++ codebase built with the WASI SDK) inside a Go program without the startup and memory cost of a wasm engine. Components: - internal/wasm — the WebAssembly binary parser. - internal/codegen — translates a parsed module into Go source through the SSA lowering + optimization + emission pipeline. - internal/ssa — a lightweight SSA IR plus optimization passes (const-propagation, DCE, CSE, branch folding, memory promotion). - transpile — the public library API: Parse, Translate, and the Transpile one-shot convenience wrapper. - cmd/wasm2go — the command-line interface. - internal/testfixture — shared helper that compiles testdata/*.wat to wasm on demand via wat2wasm. Library API (Options): - Required: Package, OutputImportPath. - Optional: BulkExportPrefix (per-export Inv_<svc>_<mt> dispatch for modules with uniformly-named exports), EntryExports (narrow DCE root set), KeepDeadFuncs (disable DCE for diff/debug), PromotionReportPath (write SSA memory-promotion JSON). Everything else is auto-derived from the input: the SSA pipeline runs unconditionally; data segments emit as //go:embed sidecars; wasi imports translate to Go-native syscalls; modules whose total function-body bytes exceed an internal threshold are emitted as a chain of //go:linkname-split sub-packages so the Go compiler stays inside a bounded per-package memory budget. WASI runtime: full wasi_snapshot_preview1 coverage. Args/environ, clocks, fd_*, path_* (open/create_directory/unlink_file/ remove_directory/rename/filestat_get/filestat_set_times/link/ symlink/readlink), readdir, pread/pwrite, sync/datasync, poll_oneoff (clock + fd-event branches), sched_yield, random_get, proc_exit, proc_raise, sock_accept/recv/send/shutdown — every call routes to the Go stdlib or golang.org/x/sys/unix equivalent. Per-platform companion files (unix/linux/darwin/windows) carry the bits that differ across OSes; the translated module is a normal Go program with the host's ordinary filesystem and network reach. Release engineering for the public repository: - GitHub Actions CI: build, vet, race-enabled tests behind an 85% coverage gate, golangci-lint — all driven through make targets. - Release workflow runs GoReleaser on version tags, including deb/rpm/apk packages, with build-provenance attestations recorded for every release asset. - A release-test workflow runs `make release/check` (GoReleaser config validation + a publish-free dry-run build) on every PR and main push so a broken release is caught before tag time. - golangci-lint and goreleaser are pinned in tools/go.mod and run via `go tool`, so local and CI invocations use the same versions. - `make install/wat2wasm` provisions the wat2wasm CLI the test suite needs, dispatching to the host's package manager (Homebrew on macOS, apt/dnf/pacman/apk on Linux). - Makefile targets for local development. Test coverage is 85.2% of statements overall. * README: document the WASI runtime, performance, and library entry points - Add a "WASI support" subsection explaining the single-file, stdlib-only `wasi_snapshot_preview1` implementation and the resulting cross-platform reach. - Add a "Performance" section with the wazero-vs-wasm2go corpus numbers (cold start 8.4×, short queries up to 81×, TPC-H scans within ±10%). Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]> * ci: align release-test with release.yml — use stable Go The release-test workflow exercises the same `make release/check` dry-run that the publish job runs at tag time, so it should pull the same toolchain. Switch it from `go-version-file: tools/go.mod` to `go-version: stable` to match release.yml. Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]> --------- Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>
52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
package codegen_test
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import (
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"bytes"
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"strings"
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"testing"
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"github.com/goccy/wasm2go/internal/codegen"
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"github.com/goccy/wasm2go/internal/testfixture"
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"github.com/goccy/wasm2go/internal/wasm"
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)
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// TestDataSegmentCoalescing verifies that adjacent data segments with a
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// small inter-segment gap are merged into a single copy() (the gap
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// zero-filled in the blob), while a segment separated by a large gap
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// stays its own copy.
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//
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// datacoalesce.wasm has three segments: "AAAA"@0, "BBBB"@8 (gap 4 — must
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// coalesce) and "CC"@100000 (gap ~100k — must stay separate).
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func TestDataSegmentCoalescing(t *testing.T) {
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bin := testfixture.Wasm(t, "datacoalesce")
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mod, err := wasm.Parse(bytes.NewReader(bin))
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if err != nil {
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t.Fatal(err)
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}
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var buf bytes.Buffer
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res, err := codegen.Translate(&buf, mod, codegen.Options{
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Package: "pkg", OutputImportPath: "gentest/pkg",
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})
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if err != nil {
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t.Fatalf("translate: %v", err)
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}
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out := buf.String()
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// Two data copies: the coalesced AAAA+gap+BBBB span and CC.
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n := strings.Count(out, "copy(m.memory[")
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if n != 2 {
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t.Errorf("data copy count = %d, want 2 (one coalesced span + one far segment)\n%s", n, out)
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}
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// data.bin: span1 = AAAA(4) + 4 zero gap + BBBB(4) = 12, span2 = CC(2).
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blob := res.Sidecars["data.bin"]
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if len(blob) != 14 {
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t.Fatalf("data.bin length = %d, want 14", len(blob))
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}
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want := []byte("AAAA\x00\x00\x00\x00BBBBCC")
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if !bytes.Equal(blob, want) {
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t.Errorf("data.bin = %q, want %q", blob, want)
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}
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}
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