[wasm] Implement correct 2-level namespace for imports.

test/mjsunit/wasm/globals.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 function TestImported(type, val, expected) {
   print("TestImported " + type + "(" + val +")" + " = " + expected);
   var builder = new WasmModuleBuilder();
   var sig = makeSig([], [type]);
-  var g = builder.addImportedGlobal("foo", undefined, type);
+  var g = builder.addImportedGlobal("uuu", "foo", type);
   builder.addFunction("main", sig)
     .addBody([kExprGetGlobal, g.index])
     .exportAs("main");
   builder.addGlobal(kAstI32);  // pad
 
-  var instance = builder.instantiate({foo: val});
+  var instance = builder.instantiate({uuu: {foo: val}});
   assertEquals(expected, instance.exports.main());
 }
 
 TestImported(kAstI32, 300.1, 300);
 TestImported(kAstF32, 87234.87238, Math.fround(87234.87238));
 TestImported(kAstF64, 77777.88888, 77777.88888);
 
 
 function TestExported(type, val, expected) {
   print("TestExported " + type + "(" + val +")" + " = " + expected);
@@ skipping 11 matching lines @@
 
 TestExported(kAstI32, 455.5, 455);
 TestExported(kAstF32, -999.34343, Math.fround(-999.34343));
 TestExported(kAstF64, 87347.66666, 87347.66666);
 
 
 function TestImportedExported(type, val, expected) {
   print("TestImportedExported " + type + "(" + val +")" + " = " + expected);
   var builder = new WasmModuleBuilder();
   var sig = makeSig([type], []);
-  var i = builder.addImportedGlobal("foo", undefined, type);
+  var i = builder.addImportedGlobal("ttt", "foo", type);
   builder.addGlobal(kAstI32);  // pad
   var o = builder.addGlobal(type, false)
       .exportAs("bar");
   o.init_index = i;
   builder.addGlobal(kAstI32);  // pad
 
-  var instance = builder.instantiate({foo: val});
+  var instance = builder.instantiate({ttt: {foo: val}});
   assertEquals(expected, instance.exports.bar);
 }
 
 TestImportedExported(kAstI32, 415.5, 415);
 TestImportedExported(kAstF32, -979.34343, Math.fround(-979.34343));
 TestImportedExported(kAstF64, 81347.66666, 81347.66666);
 
 function TestGlobalIndexSpace(type, val) {
   print("TestGlobalIndexSpace(" + val + ") = " + val);
   var builder = new WasmModuleBuilder();
-  var im = builder.addImportedGlobal("foo", undefined, type);
+  var im = builder.addImportedGlobal("nnn", "foo", type);
   assertEquals(0, im);
   var def = builder.addGlobal(type, false);
   assertEquals(1, def.index);
   def.init_index = im;
 
   var sig = makeSig([], [type]);
   builder.addFunction("main", sig)
     .addBody([kExprGetGlobal, def.index])
     .exportAs("main");
 
-  var instance = builder.instantiate({foo: val});
+  var instance = builder.instantiate({nnn: {foo: val}});
   assertEquals(val, instance.exports.main());
 }
 
 TestGlobalIndexSpace(kAstI32, 123);
 TestGlobalIndexSpace(kAstF32, 54321.125);
 TestGlobalIndexSpace(kAstF64, 12345.678);