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, 93 insertions, 0 deletions

diff --git a/test/wasm2js/select.2asm.js b/test/wasm2js/select.2asm.js
new file mode 100644
index 000000000..cdbdd19aa
--- /dev/null
+++ b/test/wasm2js/select.2asm.js
@@ -0,0 +1,93 @@
+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(lhs, rhs, cond) {
+  lhs = lhs | 0;
+  rhs = rhs | 0;
+  cond = cond | 0;
+  var wasm2js_i32$0 = 0, wasm2js_i32$1 = 0, wasm2js_i32$2 = 0;
+  return (wasm2js_i32$0 = lhs, wasm2js_i32$1 = rhs, wasm2js_i32$2 = cond, wasm2js_i32$2 ? wasm2js_i32$0 : wasm2js_i32$1) | 0;
+ }
+ 
+ function $1(lhs, lhs$hi, rhs, rhs$hi, cond) {
+  lhs = lhs | 0;
+  lhs$hi = lhs$hi | 0;
+  rhs = rhs | 0;
+  rhs$hi = rhs$hi | 0;
+  cond = cond | 0;
+  var i64toi32_i32$0 = 0, wasm2js_i32$0 = 0, wasm2js_i32$1 = 0, wasm2js_i32$2 = 0;
+  i64toi32_i32$0 = lhs$hi;
+  i64toi32_i32$0 = rhs$hi;
+  i64toi32_i32$0 = lhs$hi;
+  i64toi32_i32$0 = rhs$hi;
+  i64toi32_i32$0 = i64toi32_i32$0;
+  i64toi32_i32$HIGH_BITS = i64toi32_i32$0;
+  return (wasm2js_i32$0 = lhs, wasm2js_i32$1 = rhs, wasm2js_i32$2 = cond, wasm2js_i32$2 ? wasm2js_i32$0 : wasm2js_i32$1) | 0;
+ }
+ 
+ function $2(lhs, rhs, cond) {
+  lhs = Math_fround(lhs);
+  rhs = Math_fround(rhs);
+  cond = cond | 0;
+  var wasm2js_f32$0 = Math_fround(0), wasm2js_f32$1 = Math_fround(0), wasm2js_i32$0 = 0;
+  return Math_fround((wasm2js_f32$0 = lhs, wasm2js_f32$1 = rhs, wasm2js_i32$0 = cond, wasm2js_i32$0 ? wasm2js_f32$0 : wasm2js_f32$1));
+ }
+ 
+ function $3(lhs, rhs, cond) {
+  lhs = +lhs;
+  rhs = +rhs;
+  cond = cond | 0;
+  var wasm2js_f64$0 = 0.0, wasm2js_f64$1 = 0.0, wasm2js_i32$0 = 0;
+  return +(wasm2js_f64$0 = lhs, wasm2js_f64$1 = rhs, wasm2js_i32$0 = cond, wasm2js_i32$0 ? wasm2js_f64$0 : wasm2js_f64$1);
+ }
+ 
+ function $4(cond) {
+  cond = cond | 0;
+  var $1_1 = 0, $2_1 = 0;
+  return abort() | 0;
+ }
+ 
+ function $5(cond) {
+  cond = cond | 0;
+  var $1_1 = 0, $2_1 = 0;
+  return abort() | 0;
+ }
+ 
+ return {
+  select_i32: $0, 
+  select_i64: $1, 
+  select_f32: $2, 
+  select_f64: $3, 
+  select_trap_l: $4, 
+  select_trap_r: $5
+ };
+}
+
+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 select_i32 = retasmFunc.select_i32;
+export const select_i64 = retasmFunc.select_i64;
+export const select_f32 = retasmFunc.select_f32;
+export const select_f64 = retasmFunc.select_f64;
+export const select_trap_l = retasmFunc.select_trap_l;
+export const select_trap_r = retasmFunc.select_trap_r;