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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]>
41 lines
1.9 KiB
WebAssembly Text Format
41 lines
1.9 KiB
WebAssembly Text Format
(module
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;; Mirrors C++ virtual method dispatch via call_indirect:
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;; Each "object" has a vtable pointer at offset 0. The vtable is an
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;; array of function indexes. Calling a virtual method:
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;; vtable = *(obj + 0)
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;; fn_idx = *(vtable + slot * 4)
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;; call_indirect(fn_idx, obj, args...)
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(memory (export "memory") 1)
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(table 8 funcref)
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(type $unop (func (param i32) (result i32)))
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(type $binop (func (param i32 i32) (result i32)))
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;; Two "classes": Cat returns 1 from area, Square returns side*side.
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(func $cat_area (param $self i32) (result i32) (i32.const 1))
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(func $cat_kind (param $self i32) (result i32) (i32.const 100))
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(func $sq_area (param $self i32) (result i32)
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(i32.mul (i32.load (i32.add (local.get $self) (i32.const 4)))
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(i32.load (i32.add (local.get $self) (i32.const 4)))))
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(func $sq_kind (param $self i32) (result i32) (i32.const 200))
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(elem (i32.const 0) $cat_area $cat_kind $sq_area $sq_kind)
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;; Object layout: { vtable_idx: i32 @0, side: i32 @4 }
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;; cat at 32 { vtable=0 (cat_area, cat_kind), side=ignored }
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;; sq at 48 { vtable=8 (sq_area, sq_kind), side=5 }
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;; vtable_0 at 64: [0, 1] ;; index 0 → cat_area, 1 → cat_kind
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;; vtable_1 at 72: [2, 3]
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(data (i32.const 32) "\40\00\00\00\00\00\00\00") ;; vtable=64, side=0
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(data (i32.const 48) "\48\00\00\00\05\00\00\00") ;; vtable=72, side=5
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(data (i32.const 64) "\00\00\00\00\01\00\00\00") ;; [0, 1]
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(data (i32.const 72) "\02\00\00\00\03\00\00\00") ;; [2, 3]
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;; obj.method(slot) — vtable[slot] called as unop(obj).
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(func (export "call_method") (param $obj i32) (param $slot i32) (result i32)
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(local $vt i32)
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(local $fn i32)
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(local.set $vt (i32.load (local.get $obj)))
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(local.set $fn (i32.load
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(i32.add (local.get $vt) (i32.mul (local.get $slot) (i32.const 4)))))
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(call_indirect (type $unop) (local.get $obj) (local.get $fn))))
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