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tool that transpiles WebAssembly modules into equivalent asm.js, PHP, or Java source code.","maintainers":[{"name":"coffeetales.net","email":"coffeetales.net@gmail.com"}],"readme":"# wasm2lang\n\n
\n\n**Compile once to WebAssembly. Ship everywhere as source code.**\n\n

\n \"CI\n \"npm\n \"Launch\n

\n\n

\n \"GitHub\n \"Open\n \"Changelog\"\n \"GitHub\n

\n\n
\n\n---\n\n> **[Try it in the Playground →](https://coffeetales.github.io/wasm2lang/)** -- no install, no server. Pick a sample, pick a backend, see the generated code.\n\n---\n\n`wasm2lang` turns a WebAssembly module into **native source code** that each\nhost toolchain can compile, inline, and optimize directly -- asm.js, JavaScript,\nPHP, or Java. No interpreter. No runtime bridge. No WASM engine embedded at runtime.\n\nWrite portable logic once, compile to `.wasm`, and deploy it anywhere, even\ninto environments that refuse to load WebAssembly modules -- shared PHP hosting,\nlocked-down Java servers, WordPress plugins, browsers without WASM enabled.\n\n## Quick start\n\n```bash\nnpx @coffeetales.net/wasm2lang \\\n --language-out java \\\n --input-data '(module (func (export \"add\") (param i32 i32) (result i32) (i32.add (local.get 0) (local.get 1))))' \\\n --emit-code\n```\n\nThat prints a Java class with an `add` method. Swap `java` for `asmjs`,\n`javascript`, or `php64` and you get the same logic in the target language.\n\nInstall once for repeated use:\n\n```bash\nnpm install @coffeetales.net/wasm2lang\n```\n\n## Why\n\n- **Reach platforms WASM cannot.** Shared PHP hosting. Classloader-locked Java\n servers. Plugin hosts. Ecosystems where \"add a WASM runtime\" is not an option.\n- **Skip the JIT-over-JIT tax.** Emitted code is compiled by HotSpot, OPcache,\n or V8 directly -- no opaque runtime sits between the engine and your logic.\n- **One logic base, four ecosystems.** Fix the bug in one `.wasm`, re-emit to\n every target. Stop drift. Stop duplication.\n\n## Backends\n\n| Backend | `--language-out` | What you get |\n|----------------|------------------|-----------------------------------------------------------------------|\n| **asm.js** | `ASMJS` | Closest semantic match to WASM; V8 AOT-compiles via `\"use asm\"`. |\n| **JavaScript** | `JAVASCRIPT` | Native BigInt i64, typed-array memory, resizable `ArrayBuffer`. |\n| **PHP** | `PHP64` | Pure PHP closures. Runs on shared hosting with zero extensions. |\n| **Java** | `JAVA` | Native `long` i64, `ByteBuffer` heap, `IntVector` SIMD128 via Panama. |\n\nEvery backend is validated against the original `.wasm` on every commit:\n**17 test families × 5 build variants × 4 runtimes**, all producing\nbyte-identical stdout and matching CRC32 memory snapshots.\n\n## Features\n\n- **Structural passes** -- constant-condition folding, loop simplification,\n block-loop fusion, switch dispatch detection, if-else recovery, block-guard\n elision, redundant-block removal, local init folding.\n- **Typed coercion elimination** -- no stray `|0`, `Math_fround`, or redundant casts.\n- **Two-step pipelines** -- `--pre-normalized` lets you normalize once, ship\n the `.wasm`, and emit code later. Pass analysis survives the binary\n round-trip via a `w2l_codegen_meta` custom section.\n- **Deterministic identifier mangling** -- same key, same output. Feistel-round permutation.\n- **Built-in pass profiling** -- `WASM2LANG_PROFILE=1` flushes per-pass\n wall-clock timings to stderr. Zero cost when off.\n- **Cast-module imports** -- functions imported from a `\"cast\"` module\n (`i32_to_f32`, `f64_to_i32`, ...) lower to native type casts.\n- **Spec-compliant trapping** -- NaN and out-of-range inputs trap instead of\n silently producing wrong results.\n- **Exported mutable globals** -- getter/setter accessors on every backend.\n\n## CLI essentials\n\n```\nwasm2lang [options]\n```\n\n| Flag | What it does |\n|------------------------------|----------------------------------------------------------------------------------------------|\n| `--input-file ` | `.wasm` binary or `.wast`/`.wat` text. Use `wast:-` for stdin. |\n| `--input-data ` | Inline WebAssembly text -- no file needed. |\n| `--language-out ` | `ASMJS` (default), `JAVASCRIPT`, `PHP64`, `JAVA`. |\n| `--normalize-wasm ` | Comma list of `binaryen:none\\|min\\|max` and/or `wasm2lang:codegen`. Default: `binaryen:min`. |\n| `--emit-code [name]` | Emit the generated source; the name becomes the output symbol. |\n| `--emit-metadata [name]` | Emit static memory initialization. |\n| `--emit-web-assembly [text]` | Re-emit the (normalized) WASM -- binary by default, pass `text` for WAT. |\n| `--mangler ` | Deterministic identifier mangling. |\n| `--define K=V` | Compile-time defines (e.g. `JAVA_HEAP_SIZE=524288`). Repeatable. |\n| `--pre-normalized` | Input was pre-normalized; recover passes from the custom section. |\n| `--out-file ` | Write to a file instead of stdout. |\n\nRun `wasm2lang --help` for the full option list.\n\n### Heap-size defines\n\nEach backend sizes its heap from the module's declared `memory.initial`\n(pages × 64 KiB). Override with a `--define` when you need extra room for\nruntime allocations beyond the static segments.\n\n| Define | Backend |\n| ----------------- | ---------- |\n| `ASMJS_HEAP_SIZE` | asm.js |\n| `JS_HEAP_SIZE` | JavaScript |\n| `PHP64_HEAP_SIZE` | PHP |\n| `JAVA_HEAP_SIZE` | Java |\n\nIf the module declares no memory, the heap falls back to 65536 bytes (one page).\n\n## End-to-end example\n\n```bash\nwasm2lang \\\n --input-file module.wast \\\n --normalize-wasm binaryen:min,wasm2lang:codegen \\\n --language-out JAVA \\\n --define JAVA_HEAP_SIZE=524288 \\\n --mangler my-secret-key \\\n --emit-metadata memBuffer \\\n --emit-code module \\\n --out-file Module.java\n```\n\nThis reads `.wast`, runs the full normalization + codegen pipeline, mangles\nidentifiers deterministically, and writes a Java class with a `ByteBuffer`\nheap ready for HotSpot.\n\n### Two-step: normalize once, emit later\n\n```bash\n# Normalize + freeze pass analysis into the .wasm custom section:\nwasm2lang --input-file module.wasm \\\n --normalize-wasm binaryen:min,wasm2lang:codegen \\\n --emit-web-assembly > normalized.wasm\n\n# Later -- possibly on a different machine -- emit any target:\nwasm2lang --input-file normalized.wasm \\\n --pre-normalized \\\n --language-out PHP64 \\\n --emit-code\n```\n\n## How it works\n\n```\n.wat ┌────────────────────────────────────────┐\n.wasm >│> parse >> normalize >> passes >> emit >│> source code\n.wast └────────────────────────────────────────┘\n```\n\n1. **Parse** -- Binaryen reads `.wasm` binary or `.wast` text.\n2. **Normalize** -- optional Binaryen passes restructure IR (flatten, simplify locals, reorder, vacuum).\n3. **Passes** -- wasm2lang's own structural passes recognize and rewrite control-flow patterns.\n4. **Emit** -- a traversal-based emitter walks each function body and produces target-language source with type-aware coercion elimination and identifier mangling.\n\nNo intermediate AST is constructed. Output chunks come straight from the\ntraversal visitor, so memory overhead scales with output size, not module size.\n\n**Why asm.js?** WebAssembly is asm.js's binary evolution -- same linear-memory\nmodel, same integer-coercion semantics, same structured control flow. asm.js\nis a formally specified typed bytecode that happens to be syntactically valid\nJavaScript; V8 still AOT-compiles it via `\"use asm\"`. This makes it the most\nsemantically natural target for WASM transpilation -- close to a round-trip.\n\n## Testing\n\n```bash\nexport SPIDERMONKEY_JS=/path/to/js\nexport PHP_CLI=/path/to/php\nexport JSHELL_CLI=/path/to/jshell\n\nmkdir test_artifacts && cd test_artifacts\n../scripts/wasm2lang_build_tests.sh\n./wasm2lang_run_tests.sh\n```\n\nEvery test is built in five variants (`baseline`, `codegen`, `nomangle`,\n`nopre`, `prenorm`), run through V8, SpiderMonkey, PHP CLI, and jshell, and\ncompared against V8's execution of the original `.wasm` -- byte-identical\nstdout and matching CRC32 memory snapshots required to pass.\n\nSet `WASM2LANG_PROFILE=1` on any invocation to get per-pass wall-clock\ntimings on stderr.\n\n## Building from source\n\n```bash\nyarn closure-make # → dist_artifacts/wasmxlang.js\n```\n\nTargets Closure Compiler ADVANCED_OPTIMIZATIONS, ES5 strict.\n\n## Changelog\n\nPer-version files live under [`changelog/`](changelog/), indexed in\n[`CHANGELOG.md`](CHANGELOG.md). Current release:\n[**v2026.06.113**](changelog/v2026.06.113.md).\n\n## Contributing\n\nBug reports, issues, and pull requests welcome -- especially around backend\ncoverage, pass behavior, and test fixtures.\n\n---\n\n## Support the project\n\n
\n\n`wasm2lang` is an independent, self-funded project -- no company, no venture\nbacking, no grants. Every backend, every pass, every cross-runtime test fixture\nrepresents focused engineering work sustained over time.\n\n**Your sponsorship funds new backends, deeper optimization passes, broader\nWASM coverage (threads, exception handling, more proposals), and the\ncross-runtime validation infrastructure that keeps correctness rigorous.**\n\nIf `wasm2lang` saves you from rewriting logic across languages, unlocks a\ndeployment target a WASM runtime cannot reach, or you simply believe this\nkind of tool should exist -- consider sponsoring.\n\n### [Become a sponsor](https://github.com/sponsors/COFFEETALES)\n\n\"Become\n\n
\n","readmeFilename":"README.md"}