[js] Implement nqp::newexception.

Needs to be integrated with HLL support.

src/vm/js/Operations.nqp

@@ -670,6 +670,8 @@ class QAST::OperationsJS {
     add_simple_op('setmessage', $T_OBJ, [$T_OBJ, $T_OBJ], :sideffects);
     add_simple_op('getmessage', $T_STR, [$T_OBJ]);
 
+    add_simpile_op('newexception', $T_OBJ, [], :sideffects);
+
     add_simple_op('findmethod', $T_OBJ, [$T_OBJ, $T_STR], :sideffects);
     add_simple_op('can', $T_INT, [$T_OBJ, $T_STR], :sideffects);
 

src/vm/js/nqp-runtime/bootstrap.js

@@ -215,4 +215,24 @@ add_to_sc_with_st_and_mo(BOOTNum);
 add_to_sc_with_st_and_mo(BOOTStr);
 add_to_sc_with_st_and_mo(BOOTCode);*/
 
+function bootType(typeName, reprName) {
+  var meta_obj = KnowHOW_HOW._STable.REPR.allocate(KnowHOW_HOW._STable);
+  meta_obj.name = typeName;
+
+  var type_obj = (new reprs[reprName]).type_object_for(meta_obj);
+
+  //TODO?
+  //type_obj.st.MethodCache = meta_obj.methods;
+  //type_obj.st.ModeFlags = STable.METHOD_CACHE_AUTHORITATIVE;
+
+  core.root_objects.push(meta_obj);
+  meta_obj._SC = core;
+
+  add_to_sc_with_st(type_obj);
+
+  return type_obj;
+}
+
+module.exports.bootType = bootType;
+
 module.exports.core = core;

src/vm/js/nqp-runtime/core.js

@@ -15,6 +15,8 @@ var hll = require('./hll.js');
 
 var NQPArray = require('./array.js');
 
+var bootstrap = require('./bootstrap.js');
+
 exports.CodeRef = CodeRef;
 
 op.atpos = function(array, index) {
@@ -960,3 +962,10 @@ op.setdimensions = function(array, dimensions) {
     return op['bindposnd' + type](array, new NQPArray([x, y, z]), value);
   };
 });
+
+var BOOTException = bootstrap.bootType("BOOTException", "VMException");
+/* TODO HLL support */
+op.newexception = function() {
+  var exType = BOOTException;
+  return exType._STable.REPR.allocate(exType._STable);
+};