Force value conversion in case of TypedArray filter method (#4794)

During the execution of the TypedArray filter method it is possible
to have a different sized output TypedArray than the input one.
When copying the data to the output array the values must be
correctly converted to the output TypedArray's value range.

Fixes: #4793

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.usz@partner.samsung.com

tests/jerry/es.next/regression-test-issue-4793.js

@@ -0,0 +1,42 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Make sure that TypedArray filter correctly copies the data (avoid overflow).
+// Test creates a smaller region for "output" TypedArray.
+// Last number is intentionally a "big" float.
+var big_array = new Float64Array([0.523565555, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 333333232134.1]);
+big_array.constructor = Float32Array;
+
+var result_float32_array = big_array.filter(x => x % 2 == 0);
+assert(result_float32_array instanceof Float32Array);
+assert(result_float32_array.length === 5);
+
+// Create an even smaller result TypedArray.
+big_array.constructor = Uint8Array;
+var result_uint8_array = big_array.filter(x => x % 3 == 0);
+assert(result_uint8_array instanceof Uint8Array);
+assert(result_uint8_array.length === 3);
+
+// Trigger a filter error when at the last element
+try {
+  big_array.filter(function(x, idx) {
+    if (idx > 10) {
+        throw new Error("Error test magic");
+    }
+    return x % 4 == 0;
+  });
+} catch (ex) {
+  assert(ex instanceof Error);
+  assert(ex.message === "Error test magic");
+}