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-rw-r--r--js/src/builtin/Boolean.cpp178
1 files changed, 178 insertions, 0 deletions
diff --git a/js/src/builtin/Boolean.cpp b/js/src/builtin/Boolean.cpp
new file mode 100644
index 0000000000..a372efc9f0
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+++ b/js/src/builtin/Boolean.cpp
@@ -0,0 +1,178 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * 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/. */
+
+/*
+ * JS boolean implementation.
+ */
+
+#include "builtin/Boolean-inl.h"
+
+#include "jstypes.h"
+
+#include "jit/InlinableNatives.h"
+#include "js/PropertySpec.h"
+#include "util/StringBuffer.h"
+#include "vm/BigIntType.h"
+#include "vm/GlobalObject.h"
+#include "vm/JSContext.h"
+#include "vm/JSObject.h"
+#include "vm/WellKnownAtom.h" // js_*_str
+
+#include "vm/BooleanObject-inl.h"
+
+using namespace js;
+
+const JSClass BooleanObject::class_ = {
+ "Boolean",
+ JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean),
+ JS_NULL_CLASS_OPS, &BooleanObject::classSpec_};
+
+MOZ_ALWAYS_INLINE bool IsBoolean(HandleValue v) {
+ return v.isBoolean() || (v.isObject() && v.toObject().is<BooleanObject>());
+}
+
+// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
+// 19.4.3 Properties of the Boolean Prototype Object, thisBooleanValue.
+static MOZ_ALWAYS_INLINE bool ThisBooleanValue(HandleValue val) {
+ // Step 3, the error case, is handled by CallNonGenericMethod.
+ MOZ_ASSERT(IsBoolean(val));
+
+ // Step 1.
+ if (val.isBoolean()) {
+ return val.toBoolean();
+ }
+
+ // Step 2.
+ return val.toObject().as<BooleanObject>().unbox();
+}
+
+MOZ_ALWAYS_INLINE bool bool_toSource_impl(JSContext* cx, const CallArgs& args) {
+ bool b = ThisBooleanValue(args.thisv());
+
+ JSStringBuilder sb(cx);
+ if (!sb.append("(new Boolean(") || !BooleanToStringBuffer(b, sb) ||
+ !sb.append("))")) {
+ return false;
+ }
+
+ JSString* str = sb.finishString();
+ if (!str) {
+ return false;
+ }
+ args.rval().setString(str);
+ return true;
+}
+
+static bool bool_toSource(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return CallNonGenericMethod<IsBoolean, bool_toSource_impl>(cx, args);
+}
+
+// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
+// 19.3.3.2 Boolean.prototype.toString ( )
+MOZ_ALWAYS_INLINE bool bool_toString_impl(JSContext* cx, const CallArgs& args) {
+ // Step 1.
+ bool b = ThisBooleanValue(args.thisv());
+
+ // Step 2.
+ args.rval().setString(BooleanToString(cx, b));
+ return true;
+}
+
+static bool bool_toString(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return CallNonGenericMethod<IsBoolean, bool_toString_impl>(cx, args);
+}
+
+// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
+// 19.3.3.3 Boolean.prototype.valueOf ( )
+MOZ_ALWAYS_INLINE bool bool_valueOf_impl(JSContext* cx, const CallArgs& args) {
+ // Step 1.
+ args.rval().setBoolean(ThisBooleanValue(args.thisv()));
+ return true;
+}
+
+static bool bool_valueOf(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return CallNonGenericMethod<IsBoolean, bool_valueOf_impl>(cx, args);
+}
+
+static const JSFunctionSpec boolean_methods[] = {
+ JS_FN(js_toSource_str, bool_toSource, 0, 0),
+ JS_FN(js_toString_str, bool_toString, 0, 0),
+ JS_FN(js_valueOf_str, bool_valueOf, 0, 0), JS_FS_END};
+
+// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
+// 19.3.1.1 Boolean ( value )
+static bool Boolean(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ // Step 1.
+ bool b = args.length() != 0 ? JS::ToBoolean(args[0]) : false;
+
+ if (args.isConstructing()) {
+ // Steps 3-4.
+ RootedObject proto(cx);
+ if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_Boolean,
+ &proto)) {
+ return false;
+ }
+
+ JSObject* obj = BooleanObject::create(cx, b, proto);
+ if (!obj) {
+ return false;
+ }
+
+ // Step 5.
+ args.rval().setObject(*obj);
+ } else {
+ // Step 2.
+ args.rval().setBoolean(b);
+ }
+ return true;
+}
+
+JSObject* BooleanObject::createPrototype(JSContext* cx, JSProtoKey key) {
+ BooleanObject* booleanProto =
+ GlobalObject::createBlankPrototype<BooleanObject>(cx, cx->global());
+ if (!booleanProto) {
+ return nullptr;
+ }
+ booleanProto->setFixedSlot(BooleanObject::PRIMITIVE_VALUE_SLOT,
+ BooleanValue(false));
+ return booleanProto;
+}
+
+const ClassSpec BooleanObject::classSpec_ = {
+ GenericCreateConstructor<Boolean, 1, gc::AllocKind::FUNCTION,
+ &jit::JitInfo_Boolean>,
+ BooleanObject::createPrototype,
+ nullptr,
+ nullptr,
+ boolean_methods,
+ nullptr};
+
+PropertyName* js::BooleanToString(JSContext* cx, bool b) {
+ return b ? cx->names().true_ : cx->names().false_;
+}
+
+JS_PUBLIC_API bool js::ToBooleanSlow(HandleValue v) {
+ if (v.isString()) {
+ return v.toString()->length() != 0;
+ }
+ if (v.isBigInt()) {
+ return !v.toBigInt()->isZero();
+ }
+#ifdef ENABLE_RECORD_TUPLE
+ // proposal-record-tuple Section 3.1.1
+ if (v.isExtendedPrimitive()) {
+ return true;
+ }
+#endif
+
+ MOZ_ASSERT(v.isObject());
+ return !EmulatesUndefined(&v.toObject());
+}