TypedArray: Make byteOffset, byteLength, and length configurable

Removes the DONT_DELETE enum bit from the properties to make them
configurable.

Also, updates the regress-typedarray-length test to --
- Check for true boolean return value on deletion of these
  properties.
- Check for undefined return value on trying to access these
  properties after deletion.

BUG=v8:4902
LOG=Y

Review-Url: https://codereview.chromium.org/2001393004
Cr-Commit-Position: refs/heads/master@{#36528}

src/js/typedarray.js

@@ -827,12 +827,11 @@ utils.InstallFunctions(TypedArray, DONT_ENUM, [
   "of", TypedArrayOf
 ]);
 utils.InstallGetter(TypedArray.prototype, "buffer", TypedArrayGetBuffer);
-utils.InstallGetter(TypedArray.prototype, "byteOffset", TypedArrayGetByteOffset,
-                    DONT_ENUM | DONT_DELETE);
+utils.InstallGetter(TypedArray.prototype, "byteOffset",
+                    TypedArrayGetByteOffset);
 utils.InstallGetter(TypedArray.prototype, "byteLength",
-                    TypedArrayGetByteLength, DONT_ENUM | DONT_DELETE);
-utils.InstallGetter(TypedArray.prototype, "length", TypedArrayGetLength,
-                    DONT_ENUM | DONT_DELETE);
+                    TypedArrayGetByteLength);
+utils.InstallGetter(TypedArray.prototype, "length", TypedArrayGetLength);
 utils.InstallGetter(TypedArray.prototype, toStringTagSymbol,
                     TypedArrayGetToStringTag);
 utils.InstallFunctions(TypedArray.prototype, DONT_ENUM, [

test/mjsunit/regress/regress-typedarray-length.js

@@ -108,13 +108,13 @@ assertEquals(undefined, get(a));
   assertEquals("blah", get(a));
 })();
 
-// Ensure we cannot delete length, byteOffset, byteLength.
+// Ensure we can delete length, byteOffset, byteLength.
 assertTrue(Int32Array.prototype.__proto__.hasOwnProperty("length"));
 assertTrue(Int32Array.prototype.__proto__.hasOwnProperty("byteOffset"));
 assertTrue(Int32Array.prototype.__proto__.hasOwnProperty("byteLength"));
-assertFalse(delete Int32Array.prototype.__proto__.length);
-assertFalse(delete Int32Array.prototype.__proto__.byteOffset);
-assertFalse(delete Int32Array.prototype.__proto__.byteLength);
+assertTrue(delete Int32Array.prototype.__proto__.length);
+assertTrue(delete Int32Array.prototype.__proto__.byteOffset);
+assertTrue(delete Int32Array.prototype.__proto__.byteLength);
 
 a = new Int32Array(100);
 
@@ -122,28 +122,28 @@ get = function(a) {
   return a.length;
 }
 
-assertEquals(100, get(a));
-assertEquals(100, get(a));
-assertEquals(100, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
 %OptimizeFunctionOnNextCall(get);
-assertEquals(100, get(a));
+assertEquals(undefined, get(a));
 
 get = function(a) {
   return a.byteLength;
 }
 
-assertEquals(400, get(a));
-assertEquals(400, get(a));
-assertEquals(400, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
 %OptimizeFunctionOnNextCall(get);
-assertEquals(400, get(a));
+assertEquals(undefined, get(a));
 
 get = function(a) {
   return a.byteOffset;
 }
 
-assertEquals(0, get(a));
-assertEquals(0, get(a));
-assertEquals(0, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
+assertEquals(undefined, get(a));
 %OptimizeFunctionOnNextCall(get);
-assertEquals(0, get(a));
+assertEquals(undefined, get(a));

test/test262/test262.status

@@ -233,20 +233,6 @@
   # https://bugs.chromium.org/p/v8/issues/detail?id=4034
   'built-ins/ThrowTypeError/unique-per-realm-function-proto': [FAIL],
 
-  # https://bugs.chromium.org/p/v8/issues/detail?id=4902
-  'built-ins/TypedArray/prototype/byteLength/prop-desc': [FAIL],
-  'built-ins/TypedArray/prototype/byteOffset/prop-desc': [FAIL],
-  'built-ins/TypedArray/prototype/copyWithin/get-length-ignores-length-prop': [FAIL],
-  'built-ins/TypedArray/prototype/every/get-length-ignores-length-prop': [FAIL],
-  'built-ins/TypedArray/prototype/every/get-length-uses-internal-arraylength': [FAIL],
-  'built-ins/TypedArray/prototype/fill/get-length-ignores-length-prop': [FAIL],
-  'built-ins/TypedArray/prototype/find/get-length-ignores-length-prop': [FAIL],
-  'built-ins/TypedArray/prototype/findIndex/get-length-ignores-length-prop': [FAIL],
-  'built-ins/TypedArray/prototype/indexOf/get-length-uses-internal-arraylength': [FAIL],
-  'built-ins/TypedArray/prototype/lastIndexOf/get-length-uses-internal-arraylength': [FAIL],
-  'built-ins/TypedArray/prototype/length/prop-desc': [FAIL],
-  'built-ins/TypedArray/prototype/some/get-length-uses-internal-arraylength': [FAIL],
-
   # https://bugs.chromium.org/p/v8/issues/detail?id=4231
   'language/eval-code/direct/var-env-lower-lex-catch-non-strict': [FAIL],
   'language/statements/try/early-catch-lex': [FAIL],