Make frequent type checks (instanceof) faster by adding dedicated instanceof methods; improves dart…

runtime/lib/object.cc

Index: runtime/lib/object.cc
diff --git a/runtime/lib/object.cc b/runtime/lib/object.cc
index fe88b85e354dbd3adc0614b340d7e6d688604cfe..2c43d96e58db30af0e22668af6838a940ae0a122 100644
--- a/runtime/lib/object.cc
+++ b/runtime/lib/object.cc
@@ -207,6 +207,66 @@ DEFINE_NATIVE_ENTRY(Object_instanceOf, 5) {
 }
 
 
+DEFINE_NATIVE_ENTRY(Object_instanceOfNum, 2) {
+  const Instance& instance =
+      Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
+  const Bool& negate = Bool::CheckedHandle(zone, arguments->NativeArgAt(1));
+  bool is_instance_of = instance.IsNumber();
+  if (negate.value()) {
+    is_instance_of = !is_instance_of;
+  }
+  return Bool::Get(is_instance_of).raw();
+}
+
+
+DEFINE_NATIVE_ENTRY(Object_instanceOfInt, 2) {
+  const Instance& instance =
+      Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
+  const Bool& negate = Bool::CheckedHandle(zone, arguments->NativeArgAt(1));
+  bool is_instance_of = instance.IsInteger();
+  if (negate.value()) {
+    is_instance_of = !is_instance_of;
+  }
+  return Bool::Get(is_instance_of).raw();
+}
+
+
+DEFINE_NATIVE_ENTRY(Object_instanceOfSmi, 2) {
+  const Instance& instance =
+      Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
+  const Bool& negate = Bool::CheckedHandle(zone, arguments->NativeArgAt(1));
+  bool is_instance_of = instance.IsSmi();
+  if (negate.value()) {
+    is_instance_of = !is_instance_of;
+  }
+  return Bool::Get(is_instance_of).raw();
+}
+
+
+DEFINE_NATIVE_ENTRY(Object_instanceOfDouble, 2) {
+  const Instance& instance =
+      Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
+  const Bool& negate = Bool::CheckedHandle(zone, arguments->NativeArgAt(1));
+  bool is_instance_of = instance.IsDouble();
+  if (negate.value()) {
+    is_instance_of = !is_instance_of;
+  }
+  return Bool::Get(is_instance_of).raw();
+}
+
+
+DEFINE_NATIVE_ENTRY(Object_instanceOfString, 2) {
+  const Instance& instance =
+      Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
+  const Bool& negate = Bool::CheckedHandle(zone, arguments->NativeArgAt(1));
+  bool is_instance_of = instance.IsString();
+  if (negate.value()) {
+    is_instance_of = !is_instance_of;
+  }
+  return Bool::Get(is_instance_of).raw();
+}
+
+
 DEFINE_NATIVE_ENTRY(Object_as, 4) {
   const Instance& instance = Instance::CheckedHandle(arguments->NativeArgAt(0));
   // Instantiator at position 1 is not used. It is passed along so that the call