wasm: ignore arguments and environment variables

The wasm_exec.js file copied from the main Go repository did write those
values to address 4096 in linear memory, which led to memory corruption
in linear memory. Remove these things for now, until they're actually
supported, if support is ever added.

Author: aykevl

targets/wasm_exec.js

@@ -73,13 +73,6 @@
 
 	global.Go = class {
 		constructor() {
-			this.argv = ["js"];
-			this.env = {};
-			this.exit = (code) => {
-				if (code !== 0) {
-					console.warn("exit code:", code);
-				}
-			};
 			this._callbackTimeouts = new Map();
 			this._nextCallbackTimeoutID = 1;
 
@@ -342,36 +335,6 @@
 
 			const mem = new DataView(this._inst.exports.memory.buffer)
 
-			// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
-			let offset = 4096;
-
-			const strPtr = (str) => {
-				let ptr = offset;
-				new Uint8Array(mem.buffer, offset, str.length + 1).set(encoder.encode(str + "\0"));
-				offset += str.length + (8 - (str.length % 8));
-				return ptr;
-			};
-
-			const argc = this.argv.length;
-
-			const argvPtrs = [];
-			this.argv.forEach((arg) => {
-				argvPtrs.push(strPtr(arg));
-			});
-
-			const keys = Object.keys(this.env).sort();
-			argvPtrs.push(keys.length);
-			keys.forEach((key) => {
-				argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
-			});
-
-			const argv = offset;
-			argvPtrs.forEach((ptr) => {
-				mem.setUint32(offset, ptr, true);
-				mem.setUint32(offset + 4, 0, true);
-				offset += 8;
-			});
-
 			while (true) {
 				const callbackPromise = new Promise((resolve) => {
 					this._resolveCallbackPromise = () => {
@@ -381,7 +344,7 @@
 						setTimeout(resolve, 0); // make sure it is asynchronous
 					};
 				});
-				this._inst.exports.cwa_main(argc, argv);
+				this._inst.exports.cwa_main();
 				if (this.exited) {
 					break;
 				}
@@ -413,15 +376,12 @@
 	}
 
 	if (isNodeJS) {
-		if (process.argv.length < 3) {
+		if (process.argv.length != 3) {
 			process.stderr.write("usage: go_js_wasm_exec [wasm binary] [arguments]\n");
 			process.exit(1);
 		}
 
 		const go = new Go();
-		go.argv = process.argv.slice(2);
-		go.env = process.env;
-		go.exit = process.exit;
 		WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
 			process.on("exit", (code) => { // Node.js exits if no callback is pending
 				if (code === 0 && !go.exited) {