Add C-/JS-APIs for lowMemoryUnused and pass arguments (#2639)

Allows a user to enable/disable the `lowMemoryUnused` option and to get/set/clear arbitrary pass arguments when using the C- or JS-APIs.

* binaryen.**getLowMemoryUnused**(): `boolean`
* binaryen.**setLowMemoryUnused**(on: `boolean`): `void`
* binaryen.**getPassArgument**(key: `string`): `string | null`
* binaryen.**setPassArgument**(key: `string`, value: `string | null`): `void`
* binaryen.**clearPassArguments**(): `void`

1 files changed, 35 insertions, 3 deletions

diff --git a/src/js/binaryen.js-post.js b/src/js/binaryen.js-post.js
index fd2832bf2..d41e9575b 100644
--- a/src/js/binaryen.js-post.js
+++ b/src/js/binaryen.js-post.js
@@ -2873,7 +2873,7 @@ Module['getOptimizeLevel'] = function() {
 
 // Sets the optimization level to use. 0, 1, 2 correspond to -O0, -O1, -O2, etc.
 Module['setOptimizeLevel'] = function(level) {
-  return Module['_BinaryenSetOptimizeLevel'](level);
+  Module['_BinaryenSetOptimizeLevel'](level);
 };
 
 // Gets the currently set shrink level. 0, 1, 2 correspond to -O0, -Os, -Oz.
@@ -2883,7 +2883,7 @@ Module['getShrinkLevel'] = function() {
 
 // Sets the shrink level to use. 0, 1, 2 correspond to -O0, -Os, -Oz.
 Module['setShrinkLevel'] = function(level) {
-  return Module['_BinaryenSetShrinkLevel'](level);
+  Module['_BinaryenSetShrinkLevel'](level);
 };
 
 // Gets whether generating debug information is currently enabled or not.
@@ -2893,7 +2893,39 @@ Module['getDebugInfo'] = function() {
 
 // Enables or disables debug information in emitted binaries.
 Module['setDebugInfo'] = function(on) {
-  return Module['_BinaryenSetDebugInfo'](on);
+  Module['_BinaryenSetDebugInfo'](on);
+};
+
+// Gets whether the low 1K of memory can be considered unused when optimizing.
+Module['getLowMemoryUnused'] = function() {
+  return Boolean(Module['_BinaryenGetLowMemoryUnused']());
+};
+
+// Enables or disables whether the low 1K of memory can be considered unused
+// when optimizing.
+Module['setLowMemoryUnused'] = function(on) {
+  Module['_BinaryenSetLowMemoryUnused'](on);
+};
+
+// Gets the value of the specified arbitrary pass argument.
+Module['getPassArgument'] = function(key) {
+  return preserveStack(function() {
+    var ret = Module['_BinaryenGetPassArgument'](strToStack(key));
+    return ret !== 0 ? UTF8ToString(ret) : null;
+  });
+};
+
+// Sets the value of the specified arbitrary pass argument. Removes the
+// respective argument if `value` is NULL.
+Module['setPassArgument'] = function (key, value) {
+  preserveStack(function () {
+    Module['_BinaryenSetPassArgument'](strToStack(key), strToStack(value));
+  });
+};
+
+// Clears all arbitrary pass arguments.
+Module['clearPassArguments'] = function() {
+  Module['_BinaryenClearPassArguments']();
 };
 
 // Enables or disables C-API tracing