Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

18 files changed, 488 insertions, 0 deletions

diff --git a/js/src/tests/test262/built-ins/Atomics/load/bad-range.js b/js/src/tests/test262/built-ins/Atomics/load/bad-range.js
new file mode 100644
index 0000000000..3dfe8ae858
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/bad-range.js
@@ -0,0 +1,25 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2017 Mozilla Corporation.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Test range checking of Atomics.load on arrays that allow atomic operations
+includes: [testAtomics.js, testTypedArray.js]
+features: [ArrayBuffer, Atomics, DataView, SharedArrayBuffer, Symbol, TypedArray]
+---*/
+
+var buffer = new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 2);
+var views = nonClampedIntArrayConstructors.slice();
+
+testWithTypedArrayConstructors(function(TA) {
+  let view = new TA(buffer);
+  testWithAtomicsOutOfBoundsIndices(function(IdxGen) {
+    assert.throws(RangeError, function() {
+      Atomics.load(view, IdxGen(view));
+    }, '`Atomics.load(view, IdxGen(view))` throws RangeError');
+  });
+}, views);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/bigint/bad-range.js b/js/src/tests/test262/built-ins/Atomics/load/bigint/bad-range.js
new file mode 100644
index 0000000000..bdb8eed01e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/bigint/bad-range.js
@@ -0,0 +1,24 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Test range checking of Atomics.load on arrays that allow atomic operations
+includes: [testAtomics.js, testBigIntTypedArray.js]
+features: [ArrayBuffer, Atomics, BigInt, DataView, SharedArrayBuffer, Symbol, TypedArray]
+---*/
+
+var buffer = new SharedArrayBuffer(BigInt64Array.BYTES_PER_ELEMENT * 2);
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  let view = new TA(buffer);
+  testWithAtomicsOutOfBoundsIndices(function(IdxGen) {
+    assert.throws(RangeError, function() {
+      Atomics.load(view, IdxGen(view));
+    }, '`Atomics.load(view, IdxGen(view))` throws RangeError');
+  });
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/bigint/browser.js b/js/src/tests/test262/built-ins/Atomics/load/bigint/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/bigint/browser.js
diff --git a/js/src/tests/test262/built-ins/Atomics/load/bigint/good-views.js b/js/src/tests/test262/built-ins/Atomics/load/bigint/good-views.js
new file mode 100644
index 0000000000..995587f1eb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/bigint/good-views.js
@@ -0,0 +1,51 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-atomics.load
+description: Test Atomics.load on arrays that allow atomic operations.
+includes: [testAtomics.js, testBigIntTypedArray.js]
+features: [ArrayBuffer, Atomics, BigInt, DataView, SharedArrayBuffer, Symbol, TypedArray]
+---*/
+const sab = new SharedArrayBuffer(1024);
+const ab = new ArrayBuffer(BigInt64Array.BYTES_PER_ELEMENT * 2);
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  const view = new TA(sab, 32, 20);
+  const control = new TA(ab, 0, 2);
+  view[3] = -5n;
+  control[0] = -5n;
+
+  assert.sameValue(
+    Atomics.load(view, 3),
+    control[0],
+    'Atomics.load(view, 3) returns the value of `control[0]` (-5n)'
+  );
+
+  control[0] = 12345n;
+  view[3] = 12345n;
+
+  assert.sameValue(
+    Atomics.load(view, 3),
+    control[0],
+    'Atomics.load(view, 3) returns the value of `control[0]` (12345n)'
+  );
+
+  control[0] = 123456789n;
+  view[3] = 123456789n;
+
+  assert.sameValue(
+    Atomics.load(view, 3),
+    control[0],
+    'Atomics.load(view, 3) returns the value of `control[0]` (123456789n)'
+  );
+
+  testWithAtomicsInBoundsIndices(function(IdxGen) {
+    let Idx = IdxGen(view);
+    view.fill(0n);
+    Atomics.store(view, Idx, 37n);
+    assert.sameValue(Atomics.load(view, Idx), 37n, 'Atomics.load(view, Idx) returns 37n');
+  });
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/bigint/non-shared-bufferdata.js b/js/src/tests/test262/built-ins/Atomics/load/bigint/non-shared-bufferdata.js
new file mode 100644
index 0000000000..74d61a6988
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/bigint/non-shared-bufferdata.js
@@ -0,0 +1,17 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-atomics.load
+description: >
+  Atomics.load will operate on TA when TA.buffer is not a SharedArrayBuffer
+includes: [testBigIntTypedArray.js]
+features: [ArrayBuffer, Atomics, BigInt, TypedArray]
+---*/
+testWithBigIntTypedArrayConstructors(TA => {
+  const buffer = new ArrayBuffer(TA.BYTES_PER_ELEMENT * 4);
+  const view = new TA(buffer);
+  assert.sameValue(Atomics.load(view, 0), 0n, 'Atomics.load(view, 0) returns 0n');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/bigint/shell.js b/js/src/tests/test262/built-ins/Atomics/load/bigint/shell.js
new file mode 100644
index 0000000000..90ee9c114d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/bigint/shell.js
@@ -0,0 +1,42 @@
+// GENERATED, DO NOT EDIT
+// file: testBigIntTypedArray.js
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    Collection of functions used to assert the correctness of BigInt TypedArray objects.
+defines:
+  - TypedArray
+  - testWithBigIntTypedArrayConstructors
+---*/
+
+/**
+ * The %TypedArray% intrinsic constructor function.
+ */
+var TypedArray = Object.getPrototypeOf(Int8Array);
+
+/**
+ * Calls the provided function for every typed array constructor.
+ *
+ * @param {typedArrayConstructorCallback} f - the function to call for each typed array constructor.
+ * @param {Array} selected - An optional Array with filtered typed arrays
+ */
+function testWithBigIntTypedArrayConstructors(f, selected) {
+  /**
+   * Array containing every BigInt typed array constructor.
+   */
+  var constructors = selected || [
+    BigInt64Array,
+    BigUint64Array
+  ];
+
+  for (var i = 0; i < constructors.length; ++i) {
+    var constructor = constructors[i];
+    try {
+      f(constructor);
+    } catch (e) {
+      e.message += " (Testing with " + constructor.name + ".)";
+      throw e;
+    }
+  }
+}
diff --git a/js/src/tests/test262/built-ins/Atomics/load/browser.js b/js/src/tests/test262/built-ins/Atomics/load/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/browser.js
diff --git a/js/src/tests/test262/built-ins/Atomics/load/descriptor.js b/js/src/tests/test262/built-ins/Atomics/load/descriptor.js
new file mode 100644
index 0000000000..d3d6899b29
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/descriptor.js
@@ -0,0 +1,18 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: Testing descriptor property of Atomics.load
+includes: [propertyHelper.js]
+features: [Atomics]
+---*/
+
+verifyProperty(Atomics, 'load', {
+  enumerable: false,
+  writable: true,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js b/js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js
new file mode 100644
index 0000000000..bcbeb5b99d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/expected-return-value.js
@@ -0,0 +1,48 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2018 Rick Waldron.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Atomics.load returns the value that existed at the
+  index prior to the operation.
+info: |
+  Atomics.load( typedArray, index, value )
+
+  1. Return ? AtomicLoad(typedArray, index).
+
+  AtomicLoad( typedArray, index )
+
+  1. Let buffer be ? ValidateSharedIntegerTypedArray(typedArray).
+  2. Let i be ? ValidateAtomicAccess(typedArray, index).
+  3. Let arrayTypeName be typedArray.[[TypedArrayName]].
+  4. Let elementSize be the Number value of the Element Size value
+      specified in Table 56 for arrayTypeName.
+  5. Let elementType be the String value of the Element Type value
+      in Table 56 for arrayTypeName.
+  6. Let offset be typedArray.[[ByteOffset]].
+  7. Let indexedPosition be (i × elementSize) + offset.
+  8. Return GetValueFromBuffer(buffer, indexedPosition, elementType,
+      true, "SeqCst").
+
+features: [Atomics, SharedArrayBuffer, TypedArray]
+---*/
+
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
+);
+const update = 0b00000001000000001000000010000001;
+
+assert.sameValue(Atomics.load(i32a, 0), 0, 'Atomics.load(i32a, 0) returns 0');
+
+i32a[0] = update;
+
+assert.sameValue(
+  Atomics.load(i32a, 0),
+  update,
+  'Atomics.load(i32a, 0) returns the value of `update` (0b00000001000000001000000010000001)'
+);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/good-views.js b/js/src/tests/test262/built-ins/Atomics/load/good-views.js
new file mode 100644
index 0000000000..6f77377428
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/good-views.js
@@ -0,0 +1,49 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2017 Mozilla Corporation.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: Test Atomics.load on arrays that allow atomic operations.
+includes: [testAtomics.js, testTypedArray.js]
+features: [ArrayBuffer, Atomics, DataView, SharedArrayBuffer, Symbol, TypedArray]
+---*/
+
+const sab = new SharedArrayBuffer(1024);
+const ab = new ArrayBuffer(16);
+
+const views = nonClampedIntArrayConstructors.slice();
+
+testWithTypedArrayConstructors(function(TA) {
+  // Make it interesting - use non-zero byteOffsets and non-zero indexes.
+
+  const view = new TA(sab, 32, 20);
+  const control = new TA(ab, 0, 2);
+
+  view[3] = -5;
+  control[0] = -5;
+  assert.sameValue(Atomics.load(view, 3), control[0],
+    'Atomics.load(view, 3) returns the value of `control[0]` (-5)');
+
+  control[0] = 12345;
+  view[3] = 12345;
+  assert.sameValue(Atomics.load(view, 3), control[0],
+    'Atomics.load(view, 3) returns the value of `control[0]` (12345)');
+
+  control[0] = 123456789;
+  view[3] = 123456789;
+  assert.sameValue(Atomics.load(view, 3), control[0],
+    'Atomics.load(view, 3) returns the value of `control[0]` (123456789)');
+
+  // In-bounds boundary cases for indexing
+  testWithAtomicsInBoundsIndices(function(IdxGen) {
+    let Idx = IdxGen(view);
+    view.fill(0);
+    // Atomics.store() computes an index from Idx in the same way as other
+    // Atomics operations, not quite like view[Idx].
+    Atomics.store(view, Idx, 37);
+    assert.sameValue(Atomics.load(view, Idx), 37, 'Atomics.load(view, Idx) returns 37');
+  });
+}, views);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/length.js b/js/src/tests/test262/built-ins/Atomics/load/length.js
new file mode 100644
index 0000000000..20ca0c90f6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/length.js
@@ -0,0 +1,35 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Atomics.load.length is 2.
+info: |
+  Atomics.load ( ia, index )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description, including optional
+    parameters. However, rest parameters shown using the form “...name”
+    are not included in the default argument count.
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [Atomics]
+---*/
+
+verifyProperty(Atomics.load, 'length', {
+  value: 2,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/name.js b/js/src/tests/test262/built-ins/Atomics/load/name.js
new file mode 100644
index 0000000000..3b78cfe95b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/name.js
@@ -0,0 +1,21 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Atomics.load.name is "load".
+includes: [propertyHelper.js]
+features: [Atomics]
+---*/
+
+verifyProperty(Atomics.load, 'name', {
+  value: 'load',
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/non-shared-bufferdata.js b/js/src/tests/test262/built-ins/Atomics/load/non-shared-bufferdata.js
new file mode 100644
index 0000000000..73ae85260c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/non-shared-bufferdata.js
@@ -0,0 +1,20 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Atomics.load will operate on TA when TA.buffer is not a SharedArrayBuffer
+includes: [testTypedArray.js]
+features: [ArrayBuffer, Atomics, TypedArray]
+---*/
+testWithAtomicsFriendlyTypedArrayConstructors(TA => {
+  const view = new TA(
+    new ArrayBuffer(TA.BYTES_PER_ELEMENT * 4)
+  );
+
+  assert.sameValue(Atomics.load(view, 0), 0, 'Atomics.load(view, 0) returns 0');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/non-shared-int-views-throws.js b/js/src/tests/test262/built-ins/Atomics/load/non-shared-int-views-throws.js
new file mode 100644
index 0000000000..a8bb46083c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/non-shared-int-views-throws.js
@@ -0,0 +1,20 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Atomics.load throws when operating on non-sharable integer TypedArrays
+includes: [testTypedArray.js]
+features: [ArrayBuffer, Atomics, TypedArray]
+---*/
+testWithNonAtomicsFriendlyTypedArrayConstructors(TA => {
+  const buffer = new ArrayBuffer(TA.BYTES_PER_ELEMENT * 4);
+  const view = new TA(buffer);
+  assert.throws(TypeError, function() {
+    Atomics.load(view, 0);
+  }, `Atomics.load(new ${TA.name}(buffer), 0) throws TypeError`);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/non-views.js b/js/src/tests/test262/built-ins/Atomics/load/non-views.js
new file mode 100644
index 0000000000..a88dc89ee8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/non-views.js
@@ -0,0 +1,19 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2017 Mozilla Corporation.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.load
+description: >
+  Test Atomics.load on view values other than TypedArrays
+includes: [testAtomics.js]
+features: [ArrayBuffer, Atomics, DataView, SharedArrayBuffer, Symbol, TypedArray]
+---*/
+
+testWithAtomicsNonViewValues(function(view) {
+  assert.throws(TypeError, function() {
+    Atomics.load(view, 0);
+  }, '`Atomics.load(view, 0)` throws TypeError');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/not-a-constructor.js b/js/src/tests/test262/built-ins/Atomics/load/not-a-constructor.js
new file mode 100644
index 0000000000..270660c5cf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/not-a-constructor.js
@@ -0,0 +1,32 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  Atomics.load does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, Atomics, arrow-function, TypedArray, SharedArrayBuffer]
+---*/
+
+assert.sameValue(isConstructor(Atomics.load), false, 'isConstructor(Atomics.load) must return false');
+
+assert.throws(TypeError, () => {
+  new Atomics.load(new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT)));
+}, '`new Atomics.load(new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT)))` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Atomics/load/shell.js b/js/src/tests/test262/built-ins/Atomics/load/shell.js
new file mode 100644
index 0000000000..eda1477282
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/shell.js
@@ -0,0 +1,24 @@
+// GENERATED, DO NOT EDIT
+// file: isConstructor.js
+// Copyright (C) 2017 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: |
+    Test if a given function is a constructor function.
+defines: [isConstructor]
+features: [Reflect.construct]
+---*/
+
+function isConstructor(f) {
+    if (typeof f !== "function") {
+      throw new Test262Error("isConstructor invoked with a non-function value");
+    }
+
+    try {
+        Reflect.construct(function(){}, [], f);
+    } catch (e) {
+        return false;
+    }
+    return true;
+}
diff --git a/js/src/tests/test262/built-ins/Atomics/load/validate-arraytype-before-index-coercion.js b/js/src/tests/test262/built-ins/Atomics/load/validate-arraytype-before-index-coercion.js
new file mode 100644
index 0000000000..70ef58f258
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/load/validate-arraytype-before-index-coercion.js
@@ -0,0 +1,43 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally
+// Copyright (C) 2019 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.store
+description: >
+  TypedArray type is validated before `index` argument is coerced.
+info: |
+  24.4.7 Atomics.load ( typedArray, index )
+    1. Return ? AtomicLoad(typedArray, index).
+
+  24.4.1.12 AtomicLoad ( typedArray, index )
+    1. Let buffer be ? ValidateSharedIntegerTypedArray(typedArray).
+    ...
+
+  24.4.1.1 ValidateSharedIntegerTypedArray ( typedArray [ , onlyInt32 ] )
+    ...
+    4. Let typeName be typedArray.[[TypedArrayName]].
+    5. If onlyInt32 is true, then
+      a. If typeName is not "Int32Array", throw a TypeError exception.
+    6. Else,
+      a. If typeName is not "Int8Array", "Uint8Array", "Int16Array", "Uint16Array", "Int32Array",
+         or "Uint32Array", throw a TypeError exception.
+    ...
+includes: [testTypedArray.js]
+features: [Atomics, TypedArray]
+---*/
+
+var index = {
+  valueOf() {
+    throw new Test262Error("index coerced");
+  }
+};
+
+for (var badArrayType of nonAtomicsFriendlyTypedArrayConstructors) {
+  var typedArray = new badArrayType(new SharedArrayBuffer(8));
+  assert.throws(TypeError, function() {
+    Atomics.load(typedArray, index);
+  });
+}
+
+reportCompare(0, 0);