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, 0 insertions, 340 deletions

diff --git a/test/wasm2asm/labels.2asm.js b/test/wasm2asm/labels.2asm.js
deleted file mode 100644
index d42987ba9..000000000
--- a/test/wasm2asm/labels.2asm.js
+++ /dev/null
@@ -1,340 +0,0 @@
-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;
-  exit : {
-   $0_1 = 1;
-   break exit;
-  };
-  return $0_1 | 0;
- }
- 
- function $1() {
-  var i = 0, $6_1 = 0;
-  i = 0;
-  exit : {
-   cont : do {
-    i = i + 1 | 0;
-    if ((i | 0) == (5 | 0)) {
-     $6_1 = i;
-     break exit;
-    }
-    continue cont;
-    break cont;
-   } while (1);
-  };
-  return $6_1 | 0;
- }
- 
- function $2() {
-  var i = 0, $8_1 = 0;
-  i = 0;
-  exit : {
-   cont : do {
-    i = i + 1 | 0;
-    if ((i | 0) == (5 | 0)) continue cont;
-    if ((i | 0) == (8 | 0)) {
-     $8_1 = i;
-     break exit;
-    }
-    i = i + 1 | 0;
-    continue cont;
-    break cont;
-   } while (1);
-  };
-  return $8_1 | 0;
- }
- 
- function $3() {
-  var i = 0, $6_1 = 0;
-  i = 0;
-  exit : {
-   cont : do {
-    i = i + 1 | 0;
-    if ((i | 0) == (5 | 0)) {
-     $6_1 = i;
-     break exit;
-    }
-    break cont;
-   } while (1);
-   $6_1 = i;
-  };
-  return $6_1 | 0;
- }
- 
- function $4(max) {
-  max = max | 0;
-  var i = 0, $9_1 = 0;
-  i = 1;
-  exit : {
-   cont : do {
-    i = i + i | 0;
-    if (i >>> 0 > max >>> 0) {
-     $9_1 = i;
-     break exit;
-    }
-    continue cont;
-    break cont;
-   } while (1);
-  };
-  return $9_1 | 0;
- }
- 
- function $5() {
-  var $0_1 = 0;
-  l : do {
-   $0_1 = 1;
-   break l;
-  } while (1);
-  return $0_1 + 1 | 0 | 0;
- }
- 
- function $6() {
-  var i = 0;
-  i = 0;
-  block_1 : {
-   l : {
-    break l;
-   };
-   i = i + 1 | 0;
-   l1 : {
-    break l1;
-   };
-   i = i + 1 | 0;
-   l2 : {
-    break l2;
-   };
-   i = i + 1 | 0;
-   l3 : {
-    break l3;
-   };
-   i = i + 1 | 0;
-   l4 : {
-    break l4;
-   };
-   i = i + 1 | 0;
-  };
-  return i | 0;
- }
- 
- function $7() {
-  var i = 0;
-  i = 0;
-  block_1 : {
-   if_1 : {
-    break if_1;
-   };
-   i = i + 1 | 0;
-   if5 : {
-    break if5;
-   };
-   i = i + 1 | 0;
-   if6 : {
-    break if6;
-   };
-   i = i + 1 | 0;
-   if7 : {
-    break if7;
-   };
-   i = i + 1 | 0;
-   if8 : {
-    break if8;
-   };
-   i = i + 1 | 0;
-  };
-  return i | 0;
- }
- 
- function $8($0_1) {
-  $0_1 = $0_1 | 0;
-  var $2_2 = 0, $3_2 = 0;
-  ret : {
-   exit : {
-    $0_2 : {
-     default_ : {
-      $3_1 : {
-       $2_1 : {
-        $1_1 : {
-         switch ($0_1 | 0) {
-         case 0:
-          break $0_2;
-         case 1:
-          break $1_1;
-         case 2:
-          break $2_1;
-         case 3:
-          break $3_1;
-         default:
-          break default_;
-         };
-        };
-       };
-       $2_2 = 2;
-       break exit;
-      };
-      $3_2 = 3;
-      break ret;
-     };
-    };
-    $2_2 = 5;
-   };
-   $3_2 = Math_imul(10, $2_2);
-  };
-  return $3_2 | 0;
- }
- 
- function $9($0_1) {
-  $0_1 = $0_1 | 0;
-  $1_1 : {
-   $0_2 : {
-    switch ($0_1 | 0) {
-    case 0:
-     break $0_2;
-    default:
-     break $1_1;
-    };
-   };
-   return 0 | 0;
-  };
-  return 2 | 0;
- }
- 
- function $10() {
-  var i = 0, $10_1 = 0;
-  i = 0;
-  outer : {
-   inner : {
-    if (0) break inner;
-    i = i | 1 | 0;
-    if (1) break inner;
-    i = i | 2 | 0;
-   };
-   i = i | 4 | 0;
-   $10_1 = i;
-   if (0) break outer;
-   i = i | 8 | 0;
-   i = i | 16 | 0;
-   $10_1 = i;
-   if (1) break outer;
-   i = i | 32 | 0;
-   $10_1 = i;
-  };
-  return $10_1 | 0;
- }
- 
- function $11() {
-  var $2_2 = 0, $0_1 = 0;
-  l0 : {
-   l1 : {
-    $0_1 = 1;
-    break l1;
-   };
-   $2_2 = $0_1;
-   if (1) break l0;
-   $2_2 = 1;
-  };
-  return $2_2 | 0;
- }
- 
- function $12() {
-  var $2_2 = 0, $0_1 = 0;
-  l0 : {
-   l1 : {
-    $0_1 = 1;
-    break l1;
-   };
-   $2_2 = $0_1;
-   break l0;
-  };
-  return $2_2 | 0;
- }
- 
- function $13() {
-  var i1 = 0, $7_1 = 0, $3_2 = 0;
-  l0 : {
-   i1 = 1;
-   $3_2 = i1;
-   i1 = 2;
-   $7_1 = $3_2;
-   if (i1) break l0;
-   $7_1 = 0;
-  };
-  return i1 | 0;
- }
- 
- function $14() {
-  var $2_2 = 0, $0_1 = 0, $3_2 = 0;
-  l0 : {
-   l1 : {
-    $0_1 = 1;
-    break l1;
-   };
-   $2_2 = $0_1;
-   break l0;
-  };
-  return $2_2 | 0;
- }
- 
- function $15() {
-  var $0_1 = 0;
-  l1 : {
-   $0_1 = 1;
-   break l1;
-  };
-  return $0_1 | 0;
- }
- 
- function $16() {
-  var $1_2 = 0, $2_2 = 0;
-  l1 : {
-   $1_2 = 2;
-   l113 : {
-    $2_2 = 3;
-    break l113;
-   };
-  };
-  return $1_2 + $2_2 | 0 | 0;
- }
- 
- return {
-  block: $0, 
-  loop1: $1, 
-  loop2: $2, 
-  loop3: $3, 
-  loop4: $4, 
-  loop5: $5, 
-  if_: $6, 
-  if2: $7, 
-  switch_: $8, 
-  return_: $9, 
-  br_if0: $10, 
-  br_if1: $11, 
-  br_if2: $12, 
-  br_if3: $13, 
-  br: $14, 
-  shadowing: $15, 
-  redefinition: $16
- };
-}
-