[runtime] Port TypedArraySetFormArrayLike to C++

Bug: v8:6704
Change-Id: I316f085801f4fb6a792124f9a6f80a16e6d43162
Reviewed-on: https://chromium-review.googlesource.com/616721
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47369}

src/js/typedarray.js

@@ -250,21 +250,7 @@ TYPED_ARRAYS(TYPED_ARRAY_SUBARRAY_CASE)
 %SetForceInlineFlag(GlobalTypedArray.prototype.subarray);
 
 
-
-function TypedArraySetFromArrayLike(target, source, sourceLength, offset) {
-  if (offset > 0) {
-    for (var i = 0; i < sourceLength; i++) {
-      target[offset + i] = source[i];
-    }
-  }
-  else {
-    for (var i = 0; i < sourceLength; i++) {
-      target[i] = source[i];
-    }
-  }
-}
-
-function TypedArraySetFromOverlappingTypedArray(target, source, offset) {
+ function TypedArraySetFromOverlappingTypedArray(target, source, offset) {
   var sourceElementSize = source.BYTES_PER_ELEMENT;
   var targetElementSize = target.BYTES_PER_ELEMENT;
   var sourceLength = %_TypedArrayGetLength(source);
@@ -339,7 +325,7 @@ DEFINE_METHOD_LEN(
         if (intOffset === 0) {
           %TypedArrayCopyElements(this, obj, %_TypedArrayGetLength(obj));
         } else {
-          TypedArraySetFromArrayLike(
+          %_TypedArraySetFromArrayLike(
               this, obj, %_TypedArrayGetLength(obj), intOffset);
         }
         return;
@@ -359,7 +345,7 @@ DEFINE_METHOD_LEN(
         if (intOffset + l > %_TypedArrayGetLength(this)) {
           throw %make_range_error(kTypedArraySetSourceTooLarge);
         }
-        TypedArraySetFromArrayLike(this, obj, l, intOffset);
+        %_TypedArraySetFromArrayLike(this, obj, l, intOffset);
         return;
     }
   },

src/runtime/runtime-typedarray.cc

@@ -110,6 +110,32 @@ enum TypedArraySetResultCodes {
   TYPED_ARRAY_SET_NON_TYPED_ARRAY = 3
 };
 
+// TypedArraySetFromArrayLike(target, source, source_length, offset);
+RUNTIME_FUNCTION(Runtime_TypedArraySetFromArrayLike) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(4, args.length());
+
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, target, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, source, 1);
+
+  CONVERT_INT32_ARG_CHECKED(source_length, 2);
+  DCHECK_GE(source_length, 0);
+
+  CONVERT_INT32_ARG_CHECKED(offset, 3);
+  DCHECK_GE(offset, 0);
+
+  for (int i = 0; i < source_length; i++) {
+    Handle<Object> value;
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, value,
+                                       Object::GetElement(isolate, source, i));
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+        isolate, value,
+        Object::SetElement(isolate, target, offset + i, value,
+                           LanguageMode::STRICT));
+  }
+
+  return *target;
+}
 
 RUNTIME_FUNCTION(Runtime_TypedArraySetFastCases) {
   HandleScope scope(isolate);

src/runtime/runtime.h

@@ -619,6 +619,7 @@ namespace internal {
   F(ArrayBufferViewWasNeutered, 1, 1)    \
   F(TypedArrayGetLength, 1, 1)           \
   F(TypedArrayGetBuffer, 1, 1)           \
+  F(TypedArraySetFromArrayLike, 4, 1)    \
   F(TypedArraySetFastCases, 3, 1)        \
   F(TypedArraySortFast, 1, 1)            \
   F(TypedArrayMaxSizeInHeap, 0, 1)       \