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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]>
68 lines
2.7 KiB
WebAssembly Text Format
68 lines
2.7 KiB
WebAssembly Text Format
;; cg_nestedloop.wat — control-flow shapes that the structured SSA emitter
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;; cannot cleanly reconstruct (nested loops, sequential loops), forcing the
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;; goto-based emitMultiBlock fallback path. Uses only opcodes inside the
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;; narrow SSA-lowering set (i32 add/sub/mul/lt, local get/set, block/loop/
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;; br/br_if) so the function actually reaches SSA codegen.
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(module
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;; Two nested loops: outer counts i in [0,n), inner counts j in [0,i),
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;; accumulating i*j-ish work. Nested loops are explicitly out of scope
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;; for the structured emitter.
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(func (export "nested") (param $n i32) (result i32)
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(local $i i32)
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(local $j i32)
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(local $acc i32)
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(block $outer_done
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(loop $outer
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(br_if $outer_done (i32.ge_s (local.get $i) (local.get $n)))
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(local.set $j (i32.const 0))
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(block $inner_done
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(loop $inner
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(br_if $inner_done (i32.ge_s (local.get $j) (local.get $i)))
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(local.set $acc
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(i32.add (local.get $acc)
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(i32.add (local.get $i) (local.get $j))))
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(local.set $j (i32.add (local.get $j) (i32.const 1)))
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(br $inner)))
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(local.set $i (i32.add (local.get $i) (i32.const 1)))
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(br $outer)))
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(local.get $acc))
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;; Two sequential (non-nested) loops in one function: first sums 0..n,
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;; then doubles the running total m times.
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(func (export "seq2") (param $n i32) (param $m i32) (result i32)
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(local $i i32)
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(local $acc i32)
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(block $d1
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(loop $l1
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(br_if $d1 (i32.ge_s (local.get $i) (local.get $n)))
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(local.set $acc (i32.add (local.get $acc) (local.get $i)))
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(local.set $i (i32.add (local.get $i) (i32.const 1)))
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(br $l1)))
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(local.set $i (i32.const 0))
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(block $d2
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(loop $l2
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(br_if $d2 (i32.ge_s (local.get $i) (local.get $m)))
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(local.set $acc (i32.add (local.get $acc) (local.get $acc)))
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(local.set $i (i32.add (local.get $i) (i32.const 1)))
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(br $l2)))
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(local.get $acc))
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;; Multi-exit loop: the loop can leave to two distinct follow blocks
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;; ($hit and $miss) depending on which condition fires. The structured
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;; emitter rejects multi-exit loops, so this routes through the
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;; goto-based emitMultiBlock.
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(func (export "multiexit") (param $n i32) (param $target i32) (result i32)
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(local $i i32)
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(block $miss
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(block $hit
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(loop $l
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(br_if $hit (i32.eq (local.get $i) (local.get $target)))
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(br_if $miss (i32.ge_s (local.get $i) (local.get $n)))
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(local.set $i (i32.add (local.get $i) (i32.const 1)))
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(br $l)))
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;; reached via $hit
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(return (i32.mul (local.get $i) (i32.const 10))))
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;; reached via $miss
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(i32.const -1))
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)
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