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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]>
61 lines
2.5 KiB
WebAssembly Text Format
61 lines
2.5 KiB
WebAssembly Text Format
(module
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;; Mirrors a "C++ static initializer" pattern: a tree of records,
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;; each holding {flag i8, child_count i32 @20, children_ptr i32 @24}.
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;; init_node walks the tree, marking each node initialized, recursing into
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;; non-null children. After traversal, init_node verifies the result of
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;; some computation against an expected value — mismatch triggers a trap.
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(memory (export "memory") 1)
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;; Three records laid out in memory:
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;; record A @ 32 (flag=0, side=0, ?, ?, ?, count=2, children_ptr=80)
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;; record B @ 64 (flag=0, side=0, ?, ?, ?, count=0, children_ptr=0)
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;; record C @ 96 (flag=0, side=0, ?, ?, ?, count=0, children_ptr=0)
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;; pointer table @ 80: [64, 96]
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(data (i32.const 32)
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"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\02\00\00\00\50\00\00\00")
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(data (i32.const 64)
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"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00")
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(data (i32.const 80)
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"\40\00\00\00\60\00\00\00")
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(data (i32.const 96)
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"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00")
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;; Counter incremented every time init_node visits a fresh node.
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(data (i32.const 128) "\00\00\00\00")
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(func $init_node (param $node i32)
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(local $count i32)
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(local $children i32)
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(local $i i32)
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(local $child i32)
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;; if node.flag != 0, return (already initialized)
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(if (i32.load8_u (local.get $node))
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(then (return)))
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;; mark initialized
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(i32.store8 (local.get $node) (i32.const 1))
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;; bump global visit counter
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(i32.store (i32.const 128)
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(i32.add (i32.load (i32.const 128)) (i32.const 1)))
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;; load count + children pointer
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(local.set $count (i32.load (i32.add (local.get $node) (i32.const 20))))
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(local.set $children (i32.load (i32.add (local.get $node) (i32.const 24))))
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(local.set $i (i32.const 0))
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(block $exit
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(loop $body
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(br_if $exit (i32.eqz (local.get $count)))
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;; child = *(children + i*4)
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(local.set $child (i32.load (i32.add (local.get $children) (local.get $i))))
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(if (local.get $child)
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(then (call $init_node (local.get $child))))
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(local.set $i (i32.add (local.get $i) (i32.const 4)))
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(local.set $count (i32.sub (local.get $count) (i32.const 1)))
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(br $body))))
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(func (export "run") (result i32)
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(call $init_node (i32.const 32))
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(i32.load (i32.const 128)))
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;; Probes for individual fields after run.
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(func (export "flag_of") (param $addr i32) (result i32)
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(i32.load8_u (local.get $addr))))
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