Test that table object indexing does not interfere with backing table

test/mjsunit/wasm/table.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
 
 'use strict';
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
@@ skipping 37 matching lines @@
   assertThrows(() => new WebAssembly.Table({element: "anyfunc", initial: 10, maximum: outOfUint32RangeValue}), RangeError);
   assertThrows(() => new WebAssembly.Table({element: "anyfunc", initial: 10, maximum: 9}), RangeError);
 
   assertThrows(() => new WebAssembly.Table({element: "anyfunc", initial: 0, maximum: int32ButOob}));
 
   let table;
   table = new WebAssembly.Table({element: "anyfunc", initial: 1});
   assertTableIsValid(table);
   assertEquals(1, table.length);
   assertEquals(null, table.get(0));
+  assertEquals(undefined, table[0]);
 
   table = new WebAssembly.Table({element: "anyfunc", initial: "2"});
   assertTableIsValid(table);
   assertEquals(2, table.length);
   assertEquals(null, table.get(0));
   assertEquals(null, table.get(1));
+  assertEquals(undefined, table[0]);
+  assertEquals(undefined, table[1]);
 
   table = new WebAssembly.Table({element: "anyfunc", initial: {valueOf() { return "1" }}});
   assertTableIsValid(table);
   assertEquals(1, table.length);
   assertEquals(null, table.get(0));
+  assertEquals(undefined, table[0]);
 
   table = new WebAssembly.Table({element: "anyfunc", initial: undefined});
   assertTableIsValid(table);
   assertEquals(0, table.length);
 
   table = new WebAssembly.Table({element: "anyfunc"});
   assertTableIsValid(table);
   assertEquals(0, table.length);
 
   table = new WebAssembly.Table({element: "anyfunc", maximum: 10});
@@ skipping 74 matching lines @@
   let {wasm, host} = builder.instantiate({test: {f() {}}}).exports;
 
   let table = new WebAssembly.Table({element: "anyfunc", initial: 10});
 
   for (let f of [wasm, host]) {
     for (let i = 0; i < table.length; ++i) table.set(i, null);
     for (let i = 0; i < table.length; ++i) {
       assertSame(null, table.get(i));
       assertSame(undefined, table.set(i, f));
       assertSame(f, table.get(i));
+      assertSame(undefined, table[i]);
     }
 
     for (let i = 0; i < table.length; ++i) table.set(i, null);
     for (let i = 0; i < table.length; ++i) {
       assertSame(null, table.get(i));
       assertSame(undefined, table.set(String(i), f));
       assertSame(f, table.get(i));
+      assertSame(undefined, table[i]);
     }
 
     for (let key of [0.4, "", NaN, {}, [], () => {}]) {
       assertSame(undefined, table.set(0, null));
       assertSame(undefined, table.set(key, f));
       assertSame(f, table.get(0));
+      assertSame(undefined, table[key]);
     }
 
     for (let key of [-1, table.length, table.length * 10]) {
       assertThrows(() => table.set(key, f), RangeError);
     }
 
     assertThrows(() => table.set(0), TypeError);
     for (let val of [undefined, 0, "", {}, [], () => {}]) {
       assertThrows(() => table.set(0, val), TypeError);
     }
 
     assertThrows(() => table.set(Symbol(), f), TypeError);
     assertThrows(() => WebAssembly.Table.prototype.set.call([], 0, f),
                  TypeError);
   }
 })();
 
+
+(function TestIndexing() {
+  let builder = new WasmModuleBuilder;
+  builder.addExport("wasm", builder.addFunction("", kSig_v_v));
+  builder.addExport("host", builder.addImportWithModule("test", "f", kSig_v_v));
+  let {wasm, host} = builder.instantiate({test: {f() {}}}).exports;
+
+  let table = new WebAssembly.Table({element: "anyfunc", initial: 10});
+
+  for (let f of [wasm, host, () => {}, 5, {}, ""]) {
+    for (let i = 0; i < table.length; ++i) table[i] = f;
+    for (let i = 0; i < table.length; ++i) {
+      assertSame(null, table.get(i));
+      assertSame(f, table[i]);
+    }
+
+    for (let key of [0.4, "", NaN, {}, [], () => {}]) {
+      assertSame(f, table[key] = f);
+      assertSame(f, table[key]);
+      assertSame(null, table.get(key));
+    }
+  }
+})();
+
 (function TestGrow() {
   let builder = new WasmModuleBuilder;
   builder.addExport("wasm", builder.addFunction("", kSig_v_v));
   builder.addExport("host", builder.addImportWithModule("test", "f", kSig_v_v));
   let {wasm, host} = builder.instantiate({test: {f() {}}}).exports;
 
   function init(table) {
     for (let i = 0; i < 5; ++i) table.set(i, wasm);
     for (let i = 15; i < 20; ++i) table.set(i, host);
   }
@@ skipping 20 matching lines @@
   check(table);
   table.grow(5);
   check(table);
   table.grow(0);
   check(table);
   assertThrows(() => table.grow(1), RangeError);
   assertThrows(() => table.grow(-10), RangeError);
 
   assertThrows(() => WebAssembly.Table.prototype.grow.call([], 0), TypeError);
 })();