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, 137 insertions, 0 deletions

diff --git a/test/wasm2js/get_local.2asm.js b/test/wasm2js/get_local.2asm.js
new file mode 100644
index 000000000..b88d35036
--- /dev/null
+++ b/test/wasm2js/get_local.2asm.js
@@ -0,0 +1,137 @@
+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 $0_1 = 0;
+  return $0_1 | 0;
+ }
+ 
+ function $1() {
+  var i64toi32_i32$0 = 0, $0$hi = 0, $0_1 = 0;
+  i64toi32_i32$0 = $0$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$HIGH_BITS = i64toi32_i32$0;
+  return $0_1 | 0;
+ }
+ 
+ function $2() {
+  var $0_1 = Math_fround(0);
+  return Math_fround($0_1);
+ }
+ 
+ function $3() {
+  var $0_1 = 0.0;
+  return +$0_1;
+ }
+ 
+ function $4($0_1) {
+  $0_1 = $0_1 | 0;
+  return $0_1 | 0;
+ }
+ 
+ function $5($0_1, $0$hi) {
+  $0_1 = $0_1 | 0;
+  $0$hi = $0$hi | 0;
+  var i64toi32_i32$0 = 0;
+  i64toi32_i32$0 = $0$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$HIGH_BITS = i64toi32_i32$0;
+  return $0_1 | 0;
+ }
+ 
+ function $6($0_1) {
+  $0_1 = Math_fround($0_1);
+  return Math_fround($0_1);
+ }
+ 
+ function $7($0_1) {
+  $0_1 = +$0_1;
+  return +$0_1;
+ }
+ 
+ function $8($0_1, $0$hi, $1_1, $2_1, $3_1, $4_1) {
+  $0_1 = $0_1 | 0;
+  $0$hi = $0$hi | 0;
+  $1_1 = Math_fround($1_1);
+  $2_1 = +$2_1;
+  $3_1 = $3_1 | 0;
+  $4_1 = $4_1 | 0;
+  var i64toi32_i32$0 = 0, $5_1 = Math_fround(0), $6$hi = 0, $6_1 = 0, $7$hi = 0, $7_1 = 0, $8_1 = 0.0;
+  i64toi32_i32$0 = $0$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$0 = $6$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$0 = $7$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+ }
+ 
+ function $9($0_1, $0$hi, $1_1, $2_1, $3_1, $4_1) {
+  $0_1 = $0_1 | 0;
+  $0$hi = $0$hi | 0;
+  $1_1 = Math_fround($1_1);
+  $2_1 = +$2_1;
+  $3_1 = $3_1 | 0;
+  $4_1 = $4_1 | 0;
+  var i64toi32_i32$0 = 0, i64toi32_i32$1 = 0, $6$hi = 0, $10 = 0.0, $21 = 0.0, $7$hi = 0, $7_1 = 0;
+  i64toi32_i32$0 = 0;
+  $6$hi = i64toi32_i32$0;
+  i64toi32_i32$0 = $0$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$1 = $0_1;
+  $10 = +(i64toi32_i32$1 >>> 0) + 4294967296.0 * +(i64toi32_i32$0 >>> 0);
+  i64toi32_i32$0 = $6$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$1 = 6;
+  $21 = +(i64toi32_i32$1 >>> 0) + 4294967296.0 * +(i64toi32_i32$0 >>> 0);
+  i64toi32_i32$0 = $7$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$1 = $7_1;
+  return +($10 + (+$1_1 + ($2_1 + (+($3_1 >>> 0) + (+($4_1 | 0) + (+Math_fround(5.5) + ($21 + (+(i64toi32_i32$1 >>> 0) + 4294967296.0 * +(i64toi32_i32$0 >>> 0) + 8.0))))))));
+ }
+ 
+ return {
+  type_local_i32: $0, 
+  type_local_i64: $1, 
+  type_local_f32: $2, 
+  type_local_f64: $3, 
+  type_param_i32: $4, 
+  type_param_i64: $5, 
+  type_param_f32: $6, 
+  type_param_f64: $7, 
+  type_mixed: $8, 
+  read: $9
+ };
+}
+
+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 type_local_i32 = retasmFunc.type_local_i32;
+export const type_local_i64 = retasmFunc.type_local_i64;
+export const type_local_f32 = retasmFunc.type_local_f32;
+export const type_local_f64 = retasmFunc.type_local_f64;
+export const type_param_i32 = retasmFunc.type_param_i32;
+export const type_param_i64 = retasmFunc.type_param_i64;
+export const type_param_f32 = retasmFunc.type_param_f32;
+export const type_param_f64 = retasmFunc.type_param_f64;
+export const type_mixed = retasmFunc.type_mixed;
+export const read = retasmFunc.read;