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, 2 insertions, 2 deletions

diff --git a/check.py b/check.py
index f5e8b104a..907c14b16 100755
--- a/check.py
+++ b/check.py
@@ -31,7 +31,7 @@ from scripts.test.shared import (
 
 import scripts.test.asm2wasm as asm2wasm
 import scripts.test.lld as lld
-import scripts.test.wasm2asm as wasm2asm
+import scripts.test.wasm2js as wasm2js
 
 if options.interpreter:
   print '[ using wasm interpreter at "%s" ]' % options.interpreter
@@ -648,7 +648,7 @@ def main():
   run_spec_tests()
   run_binaryen_js_tests()
   lld.test_wasm_emscripten_finalize()
-  wasm2asm.test_wasm2asm()
+  wasm2js.test_wasm2js()
   run_validator_tests()
   if has_vanilla_emcc and has_vanilla_llvm and 0:
     run_vanilla_tests()