Merge pull request #4083 from tc39/chromium-export-7eb56ce860

[explicit-resource-management] Add move and disposed getter

test/staging/explicit-resource-management/disposable-stack-constructor-and-prototype.js

@@ -0,0 +1,21 @@
+// Copyright (C) 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Test DisposableStack constructor and prototype.
+includes: [propertyHelper.js]
+features: [globalThis, explicit-resource-management]
+---*/
+
+// constructor --------
+assert.sameValue(
+    typeof DisposableStack, 'function',
+    'The value of `typeof DisposableStack` is "function"');
+
+// prototype --------
+verifyProperty(DisposableStack, 'prototype', {
+  value: DisposableStack.prototype,
+  writable: false,
+  enumerable: false,
+  configurable: false,
+});

test/staging/explicit-resource-management/disposable-stack-disposed-getter.js

@@ -0,0 +1,34 @@
+// Copyright (C) 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Test `disposed` accessor property of DisposableStack.
+features: [explicit-resource-management]
+---*/
+
+// disposed should be true --------
+(function TestDisposableStackDisposedTrue() {
+  let stack = new DisposableStack();
+  const disposable = {
+    value: 1,
+    [Symbol.dispose]() {
+      return 42;
+    }
+  };
+  stack.use(disposable);
+  stack.dispose();
+  assert.sameValue(stack.disposed, true, 'disposed should be true');
+})();
+
+// disposed should be false --------
+(function TestDisposableStackDisposedFalse() {
+  let stack = new DisposableStack();
+  const disposable = {
+    value: 1,
+    [Symbol.dispose]() {
+      return 42;
+    }
+  };
+  stack.use(disposable);
+  assert.sameValue(stack.disposed, false, 'disposed should be false');
+})();

test/staging/explicit-resource-management/disposable-stack-move.js

@@ -0,0 +1,66 @@
+// Copyright (C) 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Test developer exposed DisposableStack protype method move.
+includes: [compareArray.js]
+features: [explicit-resource-management]
+---*/
+
+// move() method on disposed stack --------
+function TestDisposableStackMoveOnDisposedStack() {
+  let stack = new DisposableStack();
+  stack.dispose();
+  let newStack = stack.move();
+};
+
+assert.throws(
+    ReferenceError, () => TestDisposableStackMoveOnDisposedStack(),
+    'Cannot move elements from a disposed stack!');
+
+// move() method --------
+let valuesNormal = [];
+
+(function TestDisposableStackMove() {
+  let stack = new DisposableStack();
+  const firstDisposable = {
+    value: 1,
+    [Symbol.dispose]() {
+      valuesNormal.push(42);
+    }
+  };
+  const secondDisposable = {
+    value: 2,
+    [Symbol.dispose]() {
+      valuesNormal.push(43);
+    }
+  };
+  stack.use(firstDisposable);
+  stack.use(secondDisposable);
+  let newStack = stack.move();
+  newStack.dispose();
+  // stack is already disposed, so the next line should do nothing.
+  stack.dispose();
+})();
+assert.compareArray(valuesNormal, [43, 42]);
+
+// Two stacks should not be the same--------
+(function TestDisposableStackMoveNotSameObjects() {
+  let stack = new DisposableStack();
+  const firstDisposable = {
+    value: 1,
+    [Symbol.dispose]() {
+      return 42;
+    }
+  };
+  const secondDisposable = {
+    value: 2,
+    [Symbol.dispose]() {
+      return 43;
+    }
+  };
+  stack.use(firstDisposable);
+  stack.use(secondDisposable);
+  let newStack = stack.move();
+  assert.notSameValue(stack, newStack);
+})();