1 files changed, 180 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/ArrayBuffer/slice-species.js b/js/src/tests/ecma_6/ArrayBuffer/slice-species.js
new file mode 100644
index 000000000..6f025d162
--- /dev/null
+++ b/js/src/tests/ecma_6/ArrayBuffer/slice-species.js
@@ -0,0 +1,180 @@
+const tests = [
+  [Int8Array,         [9, 10, 11, 12, 13, 14, 15, 16]],
+  [Uint8Array,        [9, 10, 11, 12, 13, 14, 15, 16]],
+  [Uint8ClampedArray, [9, 10, 11, 12, 13, 14, 15, 16]],
+  [Int16Array,        [5, 6, 7, 8]],
+  [Uint16Array,       [5, 6, 7, 8]],
+  [Int32Array,        [3, 4]],
+  [Uint32Array,       [3, 4]],
+  [Float32Array,      [3, 4]],
+  [Float64Array,      [2]],
+];
+
+let logs = [];
+for (let [ctor, answer] of tests) {
+  let arr = new ctor([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
+
+  let proxyProto = new Proxy({}, {
+    get(that, name) {
+      throw new Error("unexpected prop access");
+    }
+  });
+
+  class MyArrayBuffer extends ArrayBuffer {}
+
+  arr.buffer.constructor = new Proxy({}, {
+    get(that, name) {
+      if (name == Symbol.species) {
+        logs.push("get @@species");
+        let C = new Proxy(function(...args) {
+          logs.push("call ctor");
+          return new MyArrayBuffer(...args);
+        }, {
+          get(that, name) {
+            logs.push("get ctor." + String(name));
+            if (name == "prototype") {
+              return proxyProto;
+            }
+            throw new Error("unexpected prop access");
+          }
+        });
+        return C;
+      }
+      throw new Error("unexpected prop access");
+    }
+  });
+
+  logs.length = 0;
+  let buf = arr.buffer.slice(8, 16);
+  assertEq(buf.constructor, MyArrayBuffer);
+  assertDeepEq(logs, ["get @@species", "get ctor.prototype", "call ctor"]);
+  assertDeepEq([...new ctor(buf)], answer);
+
+
+  // modified @@species
+  let a = arr.buffer;
+  a.constructor = {
+    [Symbol.species]: MyArrayBuffer
+  };
+  let b = a.slice(8, 16);
+  assertEq(b.constructor, MyArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  class MyArrayBufferWithSpecies extends ArrayBuffer {
+    get [Symbol.species]() {
+      return MyArrayBufferWithSpecies;
+    }
+  }
+  a = arr.buffer;
+  a.constructor = MyArrayBufferWithSpecies;
+  b = a.slice(8, 16);
+  assertEq(b.constructor, MyArrayBufferWithSpecies);
+  assertDeepEq([...new ctor(b)], answer);
+
+  // no @@species
+  a = arr.buffer;
+  a.constructor = {
+    [Symbol.species]: undefined
+  };
+  b = a.slice(8, 16);
+  assertEq(b.constructor, ArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  a = arr.buffer;
+  a.constructor = {
+    [Symbol.species]: null
+  };
+  b = a.slice(8, 16);
+  assertEq(b.constructor, ArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  // invalid @@species
+  for (let species of [0, 1.1, true, false, "a", /a/, Symbol.iterator, [], {}]) {
+    a = arr.buffer;
+    a.constructor = {
+      [Symbol.species]: species
+    };
+    assertThrowsInstanceOf(() => a.slice(8, 16), TypeError);
+  }
+
+  // undefined constructor
+  a = arr.buffer;
+  a.constructor = undefined;
+  b = a.slice(8, 16);
+  assertEq(b.constructor, ArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  // invalid constructor
+  for (let ctor of [null, 0, 1.1, true, false, "a", Symbol.iterator]) {
+    a = arr.buffer;
+    a.constructor = ctor;
+    assertThrowsInstanceOf(() => a.slice(8, 16), TypeError);
+  }
+
+  // @@species from different global
+  let g = newGlobal();
+  g.eval("var MyArrayBuffer = class MyArrayBuffer extends ArrayBuffer {};");
+  a = arr.buffer;
+  a.constructor = {
+    [Symbol.species]: g.MyArrayBuffer
+  };
+  b = a.slice(8, 16);
+  assertEq(b.constructor, g.MyArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  a = arr.buffer;
+  a.constructor = {
+    [Symbol.species]: g.ArrayBuffer
+  };
+  b = a.slice(8, 16);
+  assertEq(b.constructor, g.ArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  // constructor from different global
+  g.eval(`
+var MyArrayBufferWithSpecies = class MyArrayBufferWithSpecies extends ArrayBuffer {
+  get [Symbol.species]() {
+    return MyArrayBufferWithSpecies;
+  }
+};
+`);
+  a = arr.buffer;
+  a.constructor = g.MyArrayBufferWithSpecies;
+  b = a.slice(8, 16);
+  assertEq(b.constructor, g.MyArrayBufferWithSpecies);
+  assertDeepEq([...new ctor(b)], answer);
+
+  g.eval(`
+var arr = new ${ctor.name}([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
+var a = arr.buffer;
+`);
+  b = ArrayBuffer.prototype.slice.call(g.a, 8, 16);
+  assertEq(b.constructor, g.ArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  // running in different global
+  b = g.a.slice(8, 16);
+  assertEq(b.constructor, g.ArrayBuffer);
+  assertDeepEq([...new ctor(b)], answer);
+
+  // subclasses
+  // not-modified @@species
+  a = new MyArrayBuffer(16);
+  b = a.slice(8, 16);
+  assertEq(b.constructor, MyArrayBuffer);
+
+  // modified @@species
+  class MyArrayBuffer2 extends ArrayBuffer {
+  }
+  class MyArrayBuffer3 extends ArrayBuffer {
+    static get [Symbol.species]() {
+      return MyArrayBuffer2;
+    }
+  }
+  a = new MyArrayBuffer3(16);
+  b = a.slice(8, 16);
+  assertEq(b.constructor, MyArrayBuffer2);
+}
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");