1 files changed, 245 insertions, 0 deletions
diff --git a/js/src/builtin/Utilities.js b/js/src/builtin/Utilities.js
new file mode 100644
index 0000000000..f7ffadf32a
--- /dev/null
+++ b/js/src/builtin/Utilities.js
@@ -0,0 +1,245 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "SelfHostingDefines.h"
+
+// Assertions and debug printing, defined here instead of in the header above
+// to make `assert` invisible to C++.
+#ifdef DEBUG
+#define assert(b, info) \
+    do { \
+        if (!(b)) \
+            AssertionFailed(__FILE__ + ":" + __LINE__ + ": " + info) \
+    } while (false)
+#define dbg(msg) \
+    do { \
+        DumpMessage(callFunction(std_Array_pop, \
+                                 StringSplitString(__FILE__, '/')) + \
+                    '#' + __LINE__ + ': ' + msg) \
+    } while (false)
+#else
+#define assert(b, info) ; // Elided assertion.
+#define dbg(msg) ; // Elided debugging output.
+#endif
+
+// All C++-implemented standard builtins library functions used in self-hosted
+// code are installed via the std_functions JSFunctionSpec[] in
+// SelfHosting.cpp.
+//
+// Do not create an alias to a self-hosted builtin, otherwise it will be cloned
+// twice.
+//
+// Symbol is a bare constructor without properties or methods.
+var std_Symbol = Symbol;
+
+
+/********** List specification type **********/
+
+/* Spec: ECMAScript Language Specification, 5.1 edition, 8.8 */
+function List() {
+    this.length = 0;
+}
+MakeConstructible(List, {__proto__: null});
+
+
+/********** Record specification type **********/
+
+
+/* Spec: ECMAScript Internationalization API Specification, draft, 5 */
+function Record() {
+    return std_Object_create(null);
+}
+MakeConstructible(Record, {});
+
+
+/********** Abstract operations defined in ECMAScript Language Specification **********/
+
+
+/* Spec: ECMAScript Language Specification, 5.1 edition, 9.2 and 11.4.9 */
+function ToBoolean(v) {
+    return !!v;
+}
+
+
+/* Spec: ECMAScript Language Specification, 5.1 edition, 9.3 and 11.4.6 */
+function ToNumber(v) {
+    return +v;
+}
+
+// ES2017 draft rev aebf014403a3e641fb1622aec47c40f051943527
+// 7.2.10 SameValueZero ( x, y )
+function SameValueZero(x, y) {
+    return x === y || (x !== x && y !== y);
+}
+
+// ES 2017 draft (April 6, 2016) 7.3.9
+function GetMethod(V, P) {
+    // Step 1.
+    assert(IsPropertyKey(P), "Invalid property key");
+
+    // Step 2.
+    var func = V[P];
+
+    // Step 3.
+    if (func === undefined || func === null)
+        return undefined;
+
+    // Step 4.
+    if (!IsCallable(func))
+        ThrowTypeError(JSMSG_NOT_FUNCTION, typeof func);
+
+    // Step 5.
+    return func;
+}
+
+/* Spec: ECMAScript Draft, 6th edition Dec 24, 2014, 7.2.7 */
+function IsPropertyKey(argument) {
+    var type = typeof argument;
+    return type === "string" || type === "symbol";
+}
+
+#define TO_PROPERTY_KEY(name) \
+(typeof name !== "string" && typeof name !== "number" && typeof name !== "symbol" ? ToPropertyKey(name) : name)
+
+// ES 2016 draft Mar 25, 2016 7.3.20.
+function SpeciesConstructor(obj, defaultConstructor) {
+    // Step 1.
+    assert(IsObject(obj), "not passed an object");
+
+    // Step 2.
+    var ctor = obj.constructor;
+
+    // Step 3.
+    if (ctor === undefined)
+        return defaultConstructor;
+
+    // Step 4.
+    if (!IsObject(ctor))
+        ThrowTypeError(JSMSG_OBJECT_REQUIRED, "object's 'constructor' property");
+
+    // Steps 5.
+    var s = ctor[std_species];
+
+    // Step 6.
+    if (s === undefined || s === null)
+        return defaultConstructor;
+
+    // Step 7.
+    if (IsConstructor(s))
+        return s;
+
+    // Step 8.
+    ThrowTypeError(JSMSG_NOT_CONSTRUCTOR, "@@species property of object's constructor");
+}
+
+function GetTypeError(msg) {
+    try {
+        FUN_APPLY(ThrowTypeError, undefined, arguments);
+    } catch (e) {
+        return e;
+    }
+    assert(false, "the catch block should've returned from this function.");
+}
+
+function GetAggregateError(msg) {
+    try {
+        FUN_APPLY(ThrowAggregateError, undefined, arguments);
+    } catch (e) {
+        return e;
+    }
+    assert(false, "the catch block should've returned from this function.");
+}
+
+function GetInternalError(msg) {
+    try {
+        FUN_APPLY(ThrowInternalError, undefined, arguments);
+    } catch (e) {
+        return e;
+    }
+    assert(false, "the catch block should've returned from this function.");
+}
+
+// To be used when a function is required but calling it shouldn't do anything.
+function NullFunction() {}
+
+// ES2019 draft rev 4c2df13f4194057f09b920ee88712e5a70b1a556
+// 7.3.23 CopyDataProperties (target, source, excludedItems)
+function CopyDataProperties(target, source, excludedItems) {
+    // Step 1.
+    assert(IsObject(target), "target is an object");
+
+    // Step 2.
+    assert(IsObject(excludedItems), "excludedItems is an object");
+
+    // Steps 3 and 7.
+    if (source === undefined || source === null)
+        return;
+
+    // Step 4.
+    var from = ToObject(source);
+
+    // Step 5.
+    var keys = CopyDataPropertiesOrGetOwnKeys(target, from, excludedItems);
+
+    // Return if we copied all properties in native code.
+    if (keys === null)
+        return;
+
+    // Step 6.
+    for (var index = 0; index < keys.length; index++) {
+        var key = keys[index];
+
+        // We abbreviate this by calling propertyIsEnumerable which is faster
+        // and returns false for not defined properties.
+        if (!hasOwn(key, excludedItems) &&
+            callFunction(std_Object_propertyIsEnumerable, from, key))
+        {
+            _DefineDataProperty(target, key, from[key]);
+        }
+    }
+
+    // Step 7 (Return).
+}
+
+// ES2019 draft rev 4c2df13f4194057f09b920ee88712e5a70b1a556
+// 7.3.23 CopyDataProperties (target, source, excludedItems)
+function CopyDataPropertiesUnfiltered(target, source) {
+    // Step 1.
+    assert(IsObject(target), "target is an object");
+
+    // Step 2 (Not applicable).
+
+    // Steps 3 and 7.
+    if (source === undefined || source === null)
+        return;
+
+    // Step 4.
+    var from = ToObject(source);
+
+    // Step 5.
+    var keys = CopyDataPropertiesOrGetOwnKeys(target, from, null);
+
+    // Return if we copied all properties in native code.
+    if (keys === null)
+        return;
+
+    // Step 6.
+    for (var index = 0; index < keys.length; index++) {
+        var key = keys[index];
+
+        // We abbreviate this by calling propertyIsEnumerable which is faster
+        // and returns false for not defined properties.
+        if (callFunction(std_Object_propertyIsEnumerable, from, key))
+            _DefineDataProperty(target, key, from[key]);
+    }
+
+    // Step 7 (Return).
+}
+
+/*************************************** Testing functions ***************************************/
+function outer() {
+    return function inner() {
+        return "foo";
+    };
+}