[wasm] Set up Table and Memory constructors

test/mjsunit/wasm/memory.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
+
+// Basic tests.
+
+(function TestConstructor() {
+  assertTrue(WebAssembly.Memory instanceof Function);
+  assertSame(WebAssembly.Memory, WebAssembly.Memory.prototype.constructor);
+  assertTrue(WebAssembly.Memory.prototype.grow instanceof Function);
+  let desc = Object.getOwnPropertyDescriptor(WebAssembly.Memory.prototype, 'buffer');
+  assertTrue(desc.get instanceof Function);
+  assertSame(undefined, desc.set);
+
+  assertThrows(() => new WebAssembly.Memory(), TypeError);
+  assertThrows(() => new WebAssembly.Memory(1), TypeError);
+  assertThrows(() => new WebAssembly.Memory(""), TypeError);
+
+  assertThrows(() => new WebAssembly.Memory({initial: -1}), RangeError);
+  assertThrows(() => new WebAssembly.Memory({initial: 1e20}), RangeError);

[ahaas, 2016/09/15 14:41:07]

could you store 1e20 in an outOfUint32RangeValue constant and use that constant
here? Same below and in table.js

[ahaas, 2016/09/19 14:02:37]

Done.

+
+  assertThrows(() => new WebAssembly.Memory({initial: 10, maximum: -1}), RangeError);
+  assertThrows(() => new WebAssembly.Memory({initial: 10, maximum: 1e20}), RangeError);
+  assertThrows(() => new WebAssembly.Memory({initial: 10, maximum: 9}), RangeError);
+
+  let memory = new WebAssembly.Memory({initial: 1});

[ahaas, 2016/09/15 14:41:06]

Can you add a test where the maximum is set, e.g. new
WebAssembly.Memory({initial: 1, maximum: 10})?

[ahaas, 2016/09/19 14:02:37]

Done.

+  assertSame(WebAssembly.Memory.prototype, memory.__proto__);
+  assertSame(WebAssembly.Memory, memory.constructor);

[ahaas, 2016/09/15 14:41:06]

Can you check the value of maximum here?

[ahaas, 2016/09/19 14:02:37]

oh, that's not possible.

+  assertTrue(memory instanceof Object);
+  assertTrue(memory instanceof WebAssembly.Memory);
+})();
+
+(function TestBuffer() {
+  let memory = new WebAssembly.Memory({initial: 1});
+  assertTrue(memory.buffer instanceof Object);
+  assertTrue(memory.buffer instanceof ArrayBuffer);
+  assertThrows(() => {'use strict'; memory.buffer = memory.buffer}, TypeError)
+  assertThrows(() => ({__proto__: memory}).buffer, TypeError)
+})();