[typedarrays] Check detached buffer at start of typed array methods

test/mjsunit/regress/regress-4665.js

Index: test/mjsunit/regress/regress-4665.js
diff --git a/test/mjsunit/regress/regress-4665.js b/test/mjsunit/regress/regress-4665.js
index a75d68f105633322f9c9c8151dcf4a093e7bbff2..4d798f18e98b8646ddf47411aacdc36aca48cce2 100644
--- a/test/mjsunit/regress/regress-4665.js
+++ b/test/mjsunit/regress/regress-4665.js
@@ -11,8 +11,7 @@ FirstBuffer.__proto__ = Uint8Array
 var buf = new Uint8Array(10)
 buf.__proto__ = FirstBuffer.prototype
 
-var buf2 = buf.subarray(2)
-assertEquals(8, buf2.length);
+assertThrows(() => buf.subarray(2), TypeError);
 
 // Second test case
 

[Camillo Bruni, 2017/04/03 08:18:14]

Would you mind extending this test a bit to make it clearer?

let seen_args = [];

[Choongwoo Han, 2017/04/03 08:42:29]

Done.

@@ -28,4 +27,4 @@ var buf3 = new SecondBuffer(10)
 
 var buf4 = buf3.subarray(2)
 
-assertEquals(8, buf4.length);
+assertEquals(10, buf4.length);

[Camillo Bruni, 2017/04/03 08:18:14]

assertEquals([10, buf3.buffer], seen_args);

[Choongwoo Han, 2017/04/03 08:42:29]

Done.