[wasm] Imported WebAssembly function are never wrapped.

test/mjsunit/wasm/test-import-export-wrapper.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 --allow-natives-syntax
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 var expect_elison = 0;
@@ skipping 110 matching lines @@
      .instantiate({import_module_2: {import_name_2: imported}})
      .exports.second_export;
  var the_export = first_module
      .instantiate({import_module_1: {import_name_1: f}})
      .exports.first_export;
    assertEquals(the_export(), 3);
 })();
 
 // function calls stack: first_export -> first_func -> first_import ->
 // second_export -> second_import
-// In this case, second_export has less params than first_import,
-// So that wrappers will not be removed
-(function TestWasmWrapperNoElisionLessParams() {
+// In this case, second_export has fewer params than first_import,
+// so instantiation should fail.
+assertThrows(function TestWasmWrapperNoElisionLessParams() {
     var imported = function (a) {
         return a;
     };
 
     var second_module = new WasmModuleBuilder();
     var sig_index_1 = second_module.addType(kSig_i_i);
     second_module
         .addImportWithModule("import_module_2", "import_name_2", sig_index_1);
     second_module
         .addFunction("second_export", sig_index_1)
@@ skipping 30 matching lines @@
         .instantiate({import_module_2: {import_name_2: imported}})
         .exports.second_export;
     var the_export = first_module
         .instantiate({import_module_1: {import_name_1: f}})
         .exports.first_export;
     assertEquals(the_export(4, 5), 4);
     assertEquals(the_export(-1, 4), -1);
     assertEquals(the_export(0, 2), 0);
     assertEquals(the_export(9.9, 4.3), 9);
     assertEquals(%CheckWasmWrapperElision(the_export, expect_no_elison), true);
-})();
+});
 
 // function calls stack: first_export -> first_func -> first_import ->
 // second_export -> second_import
 // In this case, second_export has more params than first_import,
-// So that wrappers will not be removed
-(function TestWasmWrapperNoElisionMoreParams() {
+// so instantiation should fail.
+assertThrows(function TestWasmWrapperNoElisionMoreParams() {
     var imported = function (a, b, c) {
         return a+b+c;
     };
 
     var second_module = new WasmModuleBuilder();
     var sig_index_3 = second_module.addType(kSig_i_iii);
     second_module
         .addImportWithModule("import_module_2", "import_name_2", sig_index_3);
     second_module
         .addFunction("second_export", sig_index_3)
@@ skipping 32 matching lines @@
         .instantiate({import_module_2: {import_name_2: imported}})
         .exports.second_export;
     var the_export = first_module
         .instantiate({import_module_1: {import_name_1: f}})
         .exports.first_export;
     assertEquals(the_export(5, 6), 11);
     assertEquals(the_export(-1, -4), -5);
     assertEquals(the_export(0, 0), 0);
     assertEquals(the_export(1.1, 2.7), 3);
     assertEquals(%CheckWasmWrapperElision(the_export, expect_no_elison), true);
-})();
+});
 
 // function calls stack: first_export -> first_func -> first_import ->
 // second_export -> second_import
 // In this case, second_export has different params type with first_import,
-// So that wrappers will not be removed
-(function TestWasmWrapperNoElisionTypeMismatch() {
+// so instantiation should fail.
+assertThrows(function TestWasmWrapperNoElisionTypeMismatch() {
     var imported = function (a, b) {
         return a+b;
     };
 
     var second_module = new WasmModuleBuilder();
     var sig_index_2 = second_module.addType(kSig_d_dd);
     second_module
         .addImportWithModule("import_module_2", "import_name_2", sig_index_2);
     second_module
         .addFunction("second_export", sig_index_2)
@@ skipping 31 matching lines @@
         .instantiate({import_module_2: {import_name_2: imported}})
         .exports.second_export;
     var the_export = first_module
         .instantiate({import_module_1: {import_name_1: f}})
         .exports.first_export;
     assertEquals(the_export(2.8, 9.1), 11);
     assertEquals(the_export(-1.7, -2.5), -3);
     assertEquals(the_export(0.0, 0.0), 0);
     assertEquals(the_export(2, -2), 0);
     assertEquals(%CheckWasmWrapperElision(the_export, expect_no_elison), true);
-})();
+});