1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/tests/ecma_7/TypedObject/atopbufferwithoffset.js b/js/src/tests/ecma_7/TypedObject/atopbufferwithoffset.js
new file mode 100644
index 000000000..a4e3af08c
--- /dev/null
+++ b/js/src/tests/ecma_7/TypedObject/atopbufferwithoffset.js
@@ -0,0 +1,51 @@
+// |reftest| skip-if(!this.hasOwnProperty("TypedObject"))
+var BUGNUMBER = 898356;
+
+var {StructType, uint32, Object, Any, storage, objectType} = TypedObject;
+
+function main() { // once a C programmer, always a C programmer.
+  print(BUGNUMBER + ": " + summary);
+
+  var Uints = new StructType({f: uint32, g: uint32});
+
+  var anArray = new Uint32Array(4);
+  anArray[1] = 22;
+  anArray[2] = 44;
+
+  var uints = new Uints(anArray.buffer, 4);
+  assertEq(storage(uints).buffer, anArray.buffer);
+  assertEq(uints.f, 22);
+  assertEq(uints.g, 44);
+  uints.f++;
+  assertEq(anArray[1], 23);
+
+  // No misaligned byte offsets or offsets that would stretch past the end:
+  assertThrows(() => new Uints(anArray.buffer, -4)); // negative
+  assertThrows(() => new Uints(anArray.buffer, -3)); // negative
+  assertThrows(() => new Uints(anArray.buffer, -2)); // negative
+  assertThrows(() => new Uints(anArray.buffer, -1)); // negative
+  new Uints(anArray.buffer, 0);                      // ok
+  assertThrows(() => new Uints(anArray.buffer, 1));  // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 2));  // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 3));  // misaligned
+  new Uints(anArray.buffer, 4);                      // ok
+  assertThrows(() => new Uints(anArray.buffer, 5));  // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 6));  // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 7));  // misaligned
+  new Uints(anArray.buffer, 8);                      // ok
+  assertThrows(() => new Uints(anArray.buffer, 9));  // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 10)); // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 11)); // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 12)); // would extend past end
+  assertThrows(() => new Uints(anArray.buffer, 13)); // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 14)); // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 15)); // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 16)); // would extend past end
+  assertThrows(() => new Uints(anArray.buffer, 17)); // misaligned
+  assertThrows(() => new Uints(anArray.buffer, 4294967292)); // overflows int
+
+  reportCompare(true, true);
+  print("Tests complete");
+}
+
+main();