Cleanup throwing of the RangeError in the runtime to remove duplicated code.

runtime/lib/array.cc

Index: runtime/lib/array.cc
diff --git a/runtime/lib/array.cc b/runtime/lib/array.cc
index 7d9e076583483ae407786cab564af3ded01a1173..ec8d120cd926f3f6b18dc59713addbb2e5917b38 100644
--- a/runtime/lib/array.cc
+++ b/runtime/lib/array.cc
@@ -23,9 +23,7 @@ DEFINE_NATIVE_ENTRY(List_getIndexed, 2) {
   const Array& array = Array::CheckedHandle(arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, index, arguments->NativeArgAt(1));
   if ((index.Value() < 0) || (index.Value() >= array.Length())) {
-    const Array& args = Array::Handle(Array::New(1));
-    args.SetAt(0, index);
-    Exceptions::ThrowByType(Exceptions::kRange, args);
+    Exceptions::ThrowRangeError(index);
   }
   return array.At(index.Value());
 }
@@ -36,9 +34,7 @@ DEFINE_NATIVE_ENTRY(List_setIndexed, 3) {
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, index, arguments->NativeArgAt(1));
   const Instance& value = Instance::CheckedHandle(arguments->NativeArgAt(2));
   if ((index.Value() < 0) || (index.Value() >= array.Length())) {
-    const Array& args = Array::Handle(Array::New(1));
-    args.SetAt(0, index);
-    Exceptions::ThrowByType(Exceptions::kRange, args);
+    Exceptions::ThrowRangeError(index);
   }
   array.SetAt(index.Value(), value);
   return Object::null();
@@ -58,38 +54,7 @@ DEFINE_NATIVE_ENTRY(List_copyFromObjectArray, 5) {
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, src_start, arguments->NativeArgAt(2));
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, dst_start, arguments->NativeArgAt(3));
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, count, arguments->NativeArgAt(4));
-  intptr_t icount = count.Value();
-  if (icount < 0) {
-    Exceptions::ThrowByType(Exceptions::kArgument, Object::empty_array());
-  }
-  if (icount == 0) {
-    return Object::null();
-  }
-  intptr_t isrc_start = src_start.Value();
-  intptr_t idst_start = dst_start.Value();
-  if ((isrc_start < 0) || ((isrc_start + icount) > source.Length())) {
-    const Array& args = Array::Handle(Array::New(1));
-    args.SetAt(0, src_start);
-    Exceptions::ThrowByType(Exceptions::kRange, args);
-  }
-  if ((idst_start < 0) || ((idst_start + icount) > dest.Length())) {
-    const Array& args = Array::Handle(Array::New(1));
-    args.SetAt(0, dst_start);
-    Exceptions::ThrowByType(Exceptions::kRange, args);
-  }
-
-  Object& src_obj = Object::Handle();

[Ivan Posva, 2014/09/02 15:27:07]

PassiveObject& src_obj = ...

Since we do not need to setup the vtable in the handle at all.

[Vyacheslav Egorov (Google), 2014/09/02 16:02:53]

PassiveObject& brings around 1.5x-2x improvement. Nice!

-  if (isrc_start < idst_start) {
-    for (intptr_t i = icount - 1; i >= 0; i--) {
-      src_obj = source.At(isrc_start + i);
-      dest.SetAt(idst_start + i, src_obj);
-    }
-  } else {
-    for (intptr_t i = 0; i < icount; i++) {
-      src_obj = source.At(isrc_start + i);
-      dest.SetAt(idst_start + i, src_obj);
-    }
-  }
+  dest.CopyFrom(dst_start.Value(), source, src_start.Value(), count.Value());
   return Object::null();
 }