Rename `wasm2asm` to `wasm2js`, emit ESM by default (#1642)

* Rename the `wasm2asm` tool to `wasm2js`

This commit performs a relatively simple rename of the `wasm2asm` tool to
`wasm2js`. The functionality of the tool doesn't change just yet but it's
intended that we'll start generating an ES module instead of just an `asm.js`
function soon.

* wasm2js: Support `*.wasm` input files

Previously `wasm2js` only supported `*.wast` files but to make it a bit easier
to use in tooling pipelines this commit adds support for reading in a `*.wasm`
file directly. Determining which parser to use depends on the input filename,
where the binary parser is used with `*.wasm` files and the wast parser is used
for all other files.

* wasm2js: Emit ESM imports/exports by default

This commit alters the default behavior of `wasm2js` to emit an ESM by default,
either importing items from the environment or exporting. Items like
initialization of memory are also handled here.

1 files changed, 121 insertions, 0 deletions

diff --git a/test/wasm2js/unaligned.2asm.js b/test/wasm2js/unaligned.2asm.js
new file mode 100644
index 000000000..61d49db7f
--- /dev/null
+++ b/test/wasm2js/unaligned.2asm.js
@@ -0,0 +1,121 @@
+function asmFunc(global, env, buffer) {
+ "use asm";
+ var HEAP8 = new global.Int8Array(buffer);
+ var HEAP16 = new global.Int16Array(buffer);
+ var HEAP32 = new global.Int32Array(buffer);
+ var HEAPU8 = new global.Uint8Array(buffer);
+ var HEAPU16 = new global.Uint16Array(buffer);
+ var HEAPU32 = new global.Uint32Array(buffer);
+ var HEAPF32 = new global.Float32Array(buffer);
+ var HEAPF64 = new global.Float64Array(buffer);
+ var Math_imul = global.Math.imul;
+ var Math_fround = global.Math.fround;
+ var Math_abs = global.Math.abs;
+ var Math_clz32 = global.Math.clz32;
+ var Math_min = global.Math.min;
+ var Math_max = global.Math.max;
+ var Math_floor = global.Math.floor;
+ var Math_ceil = global.Math.ceil;
+ var Math_sqrt = global.Math.sqrt;
+ var abort = env.abort;
+ var nan = global.NaN;
+ var infinity = global.Infinity;
+ var i64toi32_i32$HIGH_BITS = 0;
+ function $0() {
+  var wasm2js_i32$0 = 0;
+  return (wasm2js_i32$0 = 0, HEAPU8[wasm2js_i32$0 >> 0] | 0 | 0 | (HEAPU8[(wasm2js_i32$0 + 1 | 0) >> 0] | 0 | 0) << 8 | (HEAPU8[(wasm2js_i32$0 + 2 | 0) >> 0] | 0 | 0) << 16 | (HEAPU8[(wasm2js_i32$0 + 3 | 0) >> 0] | 0 | 0) << 24) | 0;
+ }
+ 
+ function $1() {
+  var i64toi32_i32$0 = 0, i64toi32_i32$1 = 0, i64toi32_i32$2 = 0, wasm2js_i32$0 = 0;
+  i64toi32_i32$2 = 0;
+  i64toi32_i32$0 = (wasm2js_i32$0 = i64toi32_i32$2, HEAPU8[wasm2js_i32$0 >> 0] | 0 | 0 | (HEAPU8[(wasm2js_i32$0 + 1 | 0) >> 0] | 0 | 0) << 8 | (HEAPU8[(wasm2js_i32$0 + 2 | 0) >> 0] | 0 | 0) << 16 | (HEAPU8[(wasm2js_i32$0 + 3 | 0) >> 0] | 0 | 0) << 24);
+  i64toi32_i32$1 = (wasm2js_i32$0 = i64toi32_i32$2, HEAPU8[(wasm2js_i32$0 + 4 | 0) >> 0] | 0 | 0 | (HEAPU8[(wasm2js_i32$0 + 5 | 0) >> 0] | 0 | 0) << 8 | (HEAPU8[(wasm2js_i32$0 + 6 | 0) >> 0] | 0 | 0) << 16 | (HEAPU8[(wasm2js_i32$0 + 7 | 0) >> 0] | 0 | 0) << 24);
+  i64toi32_i32$1 = i64toi32_i32$1;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$HIGH_BITS = i64toi32_i32$1;
+  return i64toi32_i32$0 | 0;
+ }
+ 
+ function $2() {
+  var wasm2js_i32$0 = 0;
+  return Math_fround((HEAP32[0] = (wasm2js_i32$0 = 0, HEAPU8[wasm2js_i32$0 >> 0] | 0 | 0 | (HEAPU8[(wasm2js_i32$0 + 1 | 0) >> 0] | 0 | 0) << 8 | (HEAPU8[(wasm2js_i32$0 + 2 | 0) >> 0] | 0 | 0) << 16 | (HEAPU8[(wasm2js_i32$0 + 3 | 0) >> 0] | 0 | 0) << 24), HEAPF32[0]));
+ }
+ 
+ function $3() {
+  var i64toi32_i32$1 = 0, i64toi32_i32$2 = 0, wasm2js_i32$0 = 0, wasm2js_i32$1 = 0, wasm2js_i32$2 = 0;
+  i64toi32_i32$2 = 0;
+  i64toi32_i32$1 = (wasm2js_i32$0 = i64toi32_i32$2, HEAPU8[(wasm2js_i32$0 + 4 | 0) >> 0] | 0 | 0 | (HEAPU8[(wasm2js_i32$0 + 5 | 0) >> 0] | 0 | 0) << 8 | (HEAPU8[(wasm2js_i32$0 + 6 | 0) >> 0] | 0 | 0) << 16 | (HEAPU8[(wasm2js_i32$0 + 7 | 0) >> 0] | 0 | 0) << 24);
+  i64toi32_i32$1 = i64toi32_i32$1;
+  wasm2js_i32$0 = 0;
+  wasm2js_i32$1 = (wasm2js_i32$2 = i64toi32_i32$2, HEAPU8[wasm2js_i32$2 >> 0] | 0 | 0 | (HEAPU8[(wasm2js_i32$2 + 1 | 0) >> 0] | 0 | 0) << 8 | (HEAPU8[(wasm2js_i32$2 + 2 | 0) >> 0] | 0 | 0) << 16 | (HEAPU8[(wasm2js_i32$2 + 3 | 0) >> 0] | 0 | 0) << 24);
+  HEAP32[wasm2js_i32$0 >> 2] = wasm2js_i32$1;
+  wasm2js_i32$0 = 0;
+  wasm2js_i32$1 = i64toi32_i32$1;
+  HEAP32[(wasm2js_i32$0 + 4 | 0) >> 2] = wasm2js_i32$1;
+  return +(+HEAPF64[0 >> 3]);
+ }
+ 
+ function $4() {
+  var wasm2js_i32$0 = 0, wasm2js_i32$1 = 0, wasm2js_i32$2 = 0, wasm2js_i32$3 = 0;
+  wasm2js_i32$0 = 0;
+  wasm2js_i32$1 = 0;
+  (wasm2js_i32$2 = wasm2js_i32$0, wasm2js_i32$3 = wasm2js_i32$1), ((HEAP8[wasm2js_i32$2 >> 0] = wasm2js_i32$3 & 255 | 0, HEAP8[(wasm2js_i32$2 + 1 | 0) >> 0] = (wasm2js_i32$3 >>> 8 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 2 | 0) >> 0] = (wasm2js_i32$3 >>> 16 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 3 | 0) >> 0] = (wasm2js_i32$3 >>> 24 | 0) & 255 | 0;
+ }
+ 
+ function $5() {
+  var i64toi32_i32$1 = 0, wasm2js_i32$0 = 0, wasm2js_i32$1 = 0, wasm2js_i32$2 = 0, wasm2js_i32$3 = 0;
+  i64toi32_i32$1 = 0;
+  wasm2js_i32$0 = i64toi32_i32$1;
+  wasm2js_i32$1 = 0;
+  (wasm2js_i32$2 = wasm2js_i32$0, wasm2js_i32$3 = wasm2js_i32$1), ((HEAP8[wasm2js_i32$2 >> 0] = wasm2js_i32$3 & 255 | 0, HEAP8[(wasm2js_i32$2 + 1 | 0) >> 0] = (wasm2js_i32$3 >>> 8 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 2 | 0) >> 0] = (wasm2js_i32$3 >>> 16 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 3 | 0) >> 0] = (wasm2js_i32$3 >>> 24 | 0) & 255 | 0;
+  wasm2js_i32$0 = i64toi32_i32$1;
+  wasm2js_i32$1 = 0;
+  (wasm2js_i32$2 = wasm2js_i32$0, wasm2js_i32$3 = wasm2js_i32$1), ((HEAP8[(wasm2js_i32$2 + 4 | 0) >> 0] = wasm2js_i32$3 & 255 | 0, HEAP8[(wasm2js_i32$2 + 5 | 0) >> 0] = (wasm2js_i32$3 >>> 8 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 6 | 0) >> 0] = (wasm2js_i32$3 >>> 16 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 7 | 0) >> 0] = (wasm2js_i32$3 >>> 24 | 0) & 255 | 0;
+ }
+ 
+ function $6() {
+  var wasm2js_i32$0 = 0, wasm2js_i32$1 = 0, wasm2js_i32$2 = 0, wasm2js_i32$3 = 0;
+  wasm2js_i32$0 = 0;
+  wasm2js_i32$1 = (HEAPF32[0] = Math_fround(0.0), HEAP32[0] | 0);
+  (wasm2js_i32$2 = wasm2js_i32$0, wasm2js_i32$3 = wasm2js_i32$1), ((HEAP8[wasm2js_i32$2 >> 0] = wasm2js_i32$3 & 255 | 0, HEAP8[(wasm2js_i32$2 + 1 | 0) >> 0] = (wasm2js_i32$3 >>> 8 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 2 | 0) >> 0] = (wasm2js_i32$3 >>> 16 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 3 | 0) >> 0] = (wasm2js_i32$3 >>> 24 | 0) & 255 | 0;
+ }
+ 
+ function $7() {
+  var i64toi32_i32$0 = 0, i64toi32_i32$1 = 0, wasm2js_i32$0 = 0, wasm2js_f64$0 = 0.0, wasm2js_i32$1 = 0, wasm2js_i32$2 = 0, wasm2js_i32$3 = 0;
+  wasm2js_i32$0 = 0;
+  wasm2js_f64$0 = 0.0;
+  HEAPF64[wasm2js_i32$0 >> 3] = wasm2js_f64$0;
+  i64toi32_i32$0 = HEAP32[(0 + 4 | 0) >> 2] | 0;
+  i64toi32_i32$1 = 0;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  wasm2js_i32$0 = i64toi32_i32$1;
+  wasm2js_i32$1 = HEAP32[0 >> 2] | 0;
+  (wasm2js_i32$2 = wasm2js_i32$0, wasm2js_i32$3 = wasm2js_i32$1), ((HEAP8[wasm2js_i32$2 >> 0] = wasm2js_i32$3 & 255 | 0, HEAP8[(wasm2js_i32$2 + 1 | 0) >> 0] = (wasm2js_i32$3 >>> 8 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 2 | 0) >> 0] = (wasm2js_i32$3 >>> 16 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 3 | 0) >> 0] = (wasm2js_i32$3 >>> 24 | 0) & 255 | 0;
+  wasm2js_i32$0 = i64toi32_i32$1;
+  wasm2js_i32$1 = i64toi32_i32$0;
+  (wasm2js_i32$2 = wasm2js_i32$0, wasm2js_i32$3 = wasm2js_i32$1), ((HEAP8[(wasm2js_i32$2 + 4 | 0) >> 0] = wasm2js_i32$3 & 255 | 0, HEAP8[(wasm2js_i32$2 + 5 | 0) >> 0] = (wasm2js_i32$3 >>> 8 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 6 | 0) >> 0] = (wasm2js_i32$3 >>> 16 | 0) & 255 | 0), HEAP8[(wasm2js_i32$2 + 7 | 0) >> 0] = (wasm2js_i32$3 >>> 24 | 0) & 255 | 0;
+ }
+ 
+ return {
+  i32_load: $0, 
+  i64_load: $1, 
+  f32_load: $2, 
+  f64_load: $3, 
+  i32_store: $4, 
+  i64_store: $5, 
+  f32_store: $6, 
+  f64_store: $7
+ };
+}
+
+const memasmFunc = new ArrayBuffer(65536);
+const retasmFunc = asmFunc({Math,Int8Array,Uint8Array,Int16Array,Uint16Array,Int32Array,Uint32Array,Float32Array,Float64Array,NaN,Infinity}, {abort:function() { throw new Error('abort'); }},memasmFunc);
+export const i32_load = retasmFunc.i32_load;
+export const i64_load = retasmFunc.i64_load;
+export const f32_load = retasmFunc.f32_load;
+export const f64_load = retasmFunc.f64_load;
+export const i32_store = retasmFunc.i32_store;
+export const i64_store = retasmFunc.i64_store;
+export const f32_store = retasmFunc.f32_store;
+export const f64_store = retasmFunc.f64_store;