[builtins] implement Array.prototype.includes in TurboFan

src/runtime/runtime-array.cc

Index: src/runtime/runtime-array.cc
diff --git a/src/runtime/runtime-array.cc b/src/runtime/runtime-array.cc
index a92215c85d046ab8121dab8248d336c96e55fe15..64c95935268764cc8bcaebd3d76e986119891fb7 100644
--- a/src/runtime/runtime-array.cc
+++ b/src/runtime/runtime-array.cc
@@ -32,18 +32,24 @@ RUNTIME_FUNCTION(Runtime_FinishArrayPrototypeSetup) {
 }
 
 static void InstallCode(Isolate* isolate, Handle<JSObject> holder,
-                        const char* name, Handle<Code> code) {
+                        const char* name, Handle<Code> code, int argc = -1) {
   Handle<String> key = isolate->factory()->InternalizeUtf8String(name);
   Handle<JSFunction> optimized =
       isolate->factory()->NewFunctionWithoutPrototype(key, code);
-  optimized->shared()->DontAdaptArguments();
+  if (argc < 0) {
+    optimized->shared()->DontAdaptArguments();
+  } else {
+    optimized->shared()->set_internal_formal_parameter_count(argc);
+  }
   JSObject::AddProperty(holder, key, optimized, NONE);
 }
 
 static void InstallBuiltin(Isolate* isolate, Handle<JSObject> holder,
-                           const char* name, Builtins::Name builtin_name) {
+                           const char* name, Builtins::Name builtin_name,
+                           int argc = -1) {
   InstallCode(isolate, holder, name,
-              handle(isolate->builtins()->builtin(builtin_name), isolate));
+              handle(isolate->builtins()->builtin(builtin_name), isolate),
+              argc);
 }
 
 RUNTIME_FUNCTION(Runtime_SpecialArrayFunctions) {
@@ -59,6 +65,7 @@ RUNTIME_FUNCTION(Runtime_SpecialArrayFunctions) {
   InstallBuiltin(isolate, holder, "unshift", Builtins::kArrayUnshift);
   InstallBuiltin(isolate, holder, "slice", Builtins::kArraySlice);
   InstallBuiltin(isolate, holder, "splice", Builtins::kArraySplice);
+  InstallBuiltin(isolate, holder, "includes", Builtins::kArrayIncludes, 2);
 
   return *holder;
 }
@@ -438,5 +445,91 @@ RUNTIME_FUNCTION(Runtime_ArraySpeciesConstructor) {
       isolate, Object::ArraySpeciesConstructor(isolate, original_array));
 }
 
+// ES7 22.1.3.11 Array.prototype.includes
+RUNTIME_FUNCTION(Runtime_ArrayIncludes_Slow) {
+  HandleScope shs(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(Object, search_element, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, from_index_, 2);
+
+  // 1. Let O be ? ToObject(this value).
+  Handle<JSReceiver> object;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, object, Object::ToObject(isolate, handle(args[0], isolate)));
+
+  // 2. Let len be ? ToLength(? Get(O, "length")).
+  Handle<Object> len_;
+  Handle<String> length_string =
+      handle(isolate->heap()->length_string(), isolate);
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, len_, Object::GetProperty(object, length_string));
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, len_,
+                                     Object::ToLength(isolate, len_));
+  int64_t len = static_cast<int64_t>(len_->Number());
+  DCHECK_EQ(len, len_->Number());
+
+  // 3. If len is 0, return false.
+  if (len == 0) return isolate->heap()->false_value();
+
+  // 4. Let n be ? ToInteger(fromIndex). (If fromIndex is undefined,
+  //    this step produces the value 0.)
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, from_index_,
+                                     Object::ToInteger(isolate, from_index_));
+  if (std::isinf(from_index_->Number()) && from_index_->Number() > 0.0) {
+    return isolate->heap()->false_value();
+  }
+  int64_t from_index = static_cast<int64_t>(from_index_->Number());
+
+  int64_t k;
+  if (from_index >= 0) {
+    k = from_index;
+  } else {
+    k = len + from_index;
+    if (k < 0) {
+      k = 0;
+    }
+  }
+
+  if (IsFastPackedElementsKind(object->map()->elements_kind()) &&
+      len < std::numeric_limits<uint32_t>::max()) {
+    uint32_t i = static_cast<uint32_t>(k);
+    for (; i < static_cast<uint32_t>(len); ++i) {
+      Handle<Object> element_k;
+      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+          isolate, element_k, Object::GetElement(isolate, object, i));
+      if (search_element->SameValueZero(*element_k)) {
+        return isolate->heap()->true_value();
+      }
+    }
+    return isolate->heap()->false_value();
+  }
+
+  bool stable = !object->IsJSProxy() &&
+                IsFastElementsKind(object->map()->elements_kind());
+  Handle<Map> original_map = handle(object->map(), isolate);
+  for (; k < len; ++k) {
+    Handle<Object> element_k;
+    if (stable && k < std::numeric_limits<uint32_t>::max()) {
+      uint32_t index = static_cast<uint32_t>(k);
+      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+          isolate, element_k, Object::GetElement(isolate, object, index));
+      stable = object->map() == *original_map;
+    } else {
+      Handle<String> name;
+      Handle<Object> num =
+          isolate->factory()->NewNumber(static_cast<double>(k));
+      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
+                                         Object::ToString(isolate, num));
+      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+          isolate, element_k, Object::GetPropertyOrElement(object, name));
+    }
+
+    if (search_element->SameValueZero(*element_k)) {
+      return isolate->heap()->true_value();
+    }
+  }
+  return isolate->heap()->false_value();
+}
+
 }  // namespace internal
 }  // namespace v8