1 files changed, 232 insertions, 0 deletions
diff --git a/js/src/builtin/BigInt.cpp b/js/src/builtin/BigInt.cpp
new file mode 100644
index 0000000000..8a630534a8
--- /dev/null
+++ b/js/src/builtin/BigInt.cpp
@@ -0,0 +1,232 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * 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 "builtin/BigInt.h"
+
+#include "jsapi.h"
+
+#include "builtin/TypedObject.h"
+#include "gc/Tracer.h"
+#include "js/TracingAPI.h"
+#include "vm/ArrayBufferObject.h"
+#include "vm/BigIntType.h"
+#include "vm/SelfHosting.h"
+#include "vm/TaggedProto.h"
+
+#include "vm/NativeObject-inl.h"
+
+using namespace js;
+
+static MOZ_ALWAYS_INLINE bool
+IsBigInt(HandleValue v)
+{
+    return v.isBigInt() || (v.isObject() && v.toObject().is<BigIntObject>());
+}
+
+static JSObject*
+CreateBigIntPrototype(JSContext* cx, JSProtoKey key)
+{
+    return GlobalObject::createBlankPrototype<PlainObject>(cx, cx->global());
+}
+
+// BigInt proposal section 5.1.3
+static bool
+BigIntConstructor(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    // Step 1.
+    if (args.isConstructing()) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_NOT_CONSTRUCTOR, "BigInt");
+        return false;
+    }
+
+    // Step 2.
+    RootedValue v(cx, args.get(0));
+    if (!ToPrimitive(cx, JSTYPE_NUMBER, &v))
+        return false;
+
+    // Steps 3-4.
+    BigInt* bi = v.isNumber()
+                 ? NumberToBigInt(cx, v.toNumber())
+                 : ToBigInt(cx, v);
+    if (!bi)
+        return false;
+
+    args.rval().setBigInt(bi);
+    return true;
+}
+
+JSObject*
+BigIntObject::create(JSContext* cx, HandleBigInt bigInt)
+{
+    RootedObject obj(cx, NewBuiltinClassInstance(cx, &class_));
+    if (!obj)
+        return nullptr;
+    BigIntObject& bn = obj->as<BigIntObject>();
+    bn.setFixedSlot(PRIMITIVE_VALUE_SLOT, BigIntValue(bigInt));
+    return &bn;
+}
+
+BigInt*
+BigIntObject::unbox() const
+{
+    return getFixedSlot(PRIMITIVE_VALUE_SLOT).toBigInt();
+}
+
+// BigInt proposal section 5.3.4
+bool
+BigIntObject::valueOf_impl(JSContext* cx, const CallArgs& args)
+{
+    // Step 1.
+    HandleValue thisv = args.thisv();
+    MOZ_ASSERT(IsBigInt(thisv));
+    RootedBigInt bi(cx, thisv.isBigInt()
+                        ? thisv.toBigInt()
+                        : thisv.toObject().as<BigIntObject>().unbox());
+
+    args.rval().setBigInt(bi);
+    return true;
+}
+
+bool
+BigIntObject::valueOf(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    return CallNonGenericMethod<IsBigInt, valueOf_impl>(cx, args);
+}
+
+// BigInt proposal section 5.3.3
+bool
+BigIntObject::toString_impl(JSContext* cx, const CallArgs& args)
+{
+    // Step 1.
+    HandleValue thisv = args.thisv();
+    MOZ_ASSERT(IsBigInt(thisv));
+    RootedBigInt bi(cx, thisv.isBigInt()
+                        ? thisv.toBigInt()
+                        : thisv.toObject().as<BigIntObject>().unbox());
+
+    // Steps 2-3.
+    uint8_t radix = 10;
+
+    // Steps 4-5.
+    if (args.hasDefined(0)) {
+        double d;
+        if (!ToInteger(cx, args.get(0), &d))
+            return false;
+        if (d < 2 || d > 36) {
+            JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_RADIX);
+            return false;
+        }
+        radix = d;
+    }
+
+    // Steps 6-7.
+    JSLinearString* str = BigInt::toString(cx, bi, radix);
+    if (!str)
+        return false;
+    args.rval().setString(str);
+    return true;
+}
+
+bool
+BigIntObject::toString(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    return CallNonGenericMethod<IsBigInt, toString_impl>(cx, args);
+}
+
+// BigInt proposal section 5.2.1. BigInt.asUintN ( bits, bigint )
+bool
+BigIntObject::asUintN(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    // Step 1.
+    uint64_t bits;
+    if (!ToIndex(cx, args.get(0), &bits)) {
+        return false;
+    }
+
+    // Step 2.
+    RootedBigInt bi(cx, ToBigInt(cx, args.get(1)));
+    if (!bi) {
+        return false;
+    }
+
+    // Step 3.
+    BigInt* res = BigInt::asUintN(cx, bi, bits);
+    if (!res) {
+        return false;
+    }
+
+    args.rval().setBigInt(res);
+    return true;
+}
+
+// BigInt proposal section 5.2.2. BigInt.asIntN ( bits, bigint )
+bool
+BigIntObject::asIntN(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    // Step 1.
+    uint64_t bits;
+    if (!ToIndex(cx, args.get(0), &bits)) {
+        return false;
+    }
+
+    // Step 2.
+    RootedBigInt bi(cx, ToBigInt(cx, args.get(1)));
+    if (!bi) {
+        return false;
+    }
+
+    // Step 3.
+    BigInt* res = BigInt::asIntN(cx, bi, bits);
+    if (!res) {
+        return false;
+    }
+
+    args.rval().setBigInt(res);
+    return true;
+}
+
+const ClassSpec BigIntObject::classSpec_ = {
+    GenericCreateConstructor<BigIntConstructor, 1, gc::AllocKind::FUNCTION>,
+    CreateBigIntPrototype,
+    BigIntObject::staticMethods,
+    nullptr,
+    BigIntObject::methods,
+    BigIntObject::properties
+};
+
+const Class BigIntObject::class_ = {
+    "BigInt",
+    JSCLASS_HAS_CACHED_PROTO(JSProto_BigInt) |
+    JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS),
+    JS_NULL_CLASS_OPS,
+    &BigIntObject::classSpec_
+};
+
+const JSPropertySpec BigIntObject::properties[] = {
+    // BigInt proposal section 5.3.5
+    JS_STRING_SYM_PS(toStringTag, "BigInt", JSPROP_READONLY),
+    JS_PS_END
+};
+
+const JSFunctionSpec BigIntObject::methods[] = {
+    JS_FN("valueOf", valueOf, 0, 0),
+    JS_FN("toString", toString, 0, 0),
+    JS_SELF_HOSTED_FN("toLocaleString", "BigInt_toLocaleString", 0, 0),
+    JS_FS_END
+};
+
+const JSFunctionSpec BigIntObject::staticMethods[] = {
+    JS_FN("asUintN", asUintN, 2, 0),
+    JS_FN("asIntN", asIntN, 2, 0),
+    JS_FS_END
+};