Add WASM FunC autotests (#673)

* feat: func wasm autotests

* fixes necessary for func wasm autotests

---------

Co-authored-by: krigga <krigga7@gmail.com>

crypto/func/auto-tests/wasm_tests_common.js

@@ -0,0 +1,63 @@
+const fsSync = require('fs');
+
+const copyToCString = (mod, str) => {
+    const len = mod.lengthBytesUTF8(str) + 1;
+    const ptr = mod._malloc(len);
+    mod.stringToUTF8(str, ptr, len);
+    return ptr;
+};
+
+const copyToCStringPtr = (mod, str, ptr) => {
+    const allocated = copyToCString(mod, str);
+    mod.setValue(ptr, allocated, '*');
+    return allocated;
+};
+
+const copyFromCString = (mod, ptr) => {
+    return mod.UTF8ToString(ptr);
+};
+
+async function compileFile(mod, filename) {
+    const callbackPtr = mod.addFunction((_kind, _data, contents, error) => {
+        const kind = copyFromCString(mod, _kind);
+        const data = copyFromCString(mod, _data);
+        if (kind === 'realpath') {
+            copyToCStringPtr(mod, fsSync.realpathSync(data), contents);
+        } else if (kind === 'source') {
+            const path = fsSync.realpathSync(data);
+            try {
+                copyToCStringPtr(mod, fsSync.readFileSync(path).toString('utf-8'), contents);
+            } catch (err) {
+                copyToCStringPtr(mod, e.message, error);
+            }
+        } else {
+            copyToCStringPtr(mod, 'Unknown callback kind ' + kind, error);
+        }
+    }, 'viiii');
+
+    const config = {
+        optLevel: 2,
+        sources: [filename]
+    };
+
+    const configPtr = copyToCString(mod, JSON.stringify(config));
+
+    const responsePtr = mod._func_compile(configPtr, callbackPtr);
+
+    return JSON.parse(copyFromCString(mod, responsePtr));
+}
+
+const wasmModule = require(process.env.FUNCFIFTLIB_MODULE)
+
+const wasmBinary = new Uint8Array(fsSync.readFileSync(process.env.FUNCFIFTLIB_WASM))
+
+async function compileWasm() {
+    const mod = await wasmModule({ wasmBinary })
+
+    return mod
+}
+
+module.exports = {
+    compileFile,
+    compileWasm
+}