Add %GetUndetectable() test intrinsic and add tests for undetectables.

test/mjsunit/undetectable-compare.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+var undetectable = %GetUndetectable();
+
+var tests = [
+  true,        false,
+  false,       false,
+  null,        true,
+  void 0,      true,
+  0,           false,
+  0.0,         false,
+  -0,          false,
+  "",          false,
+  -1,          false,
+  -1.25,       false,
+  1,           false,
+  1.25,        false,
+  -2147483648, false,
+  2147483648,  false,
+  Infinity,    false,
+  -Infinity,   false,
+  NaN,         false
+];
+
+var func = (function eq(a) { return a == undetectable; });
+var left_funcs = [
+  (function eq_L0() { return true == undetectable; }),
+  (function eq_L1() { return false == undetectable; }),
+  (function eq_L2() { return null == undetectable; }),
+  (function eq_L3() { return void 0 == undetectable; }),
+  (function eq_L4() { return 0 == undetectable; }),
+  (function eq_L5() { return 0.0 == undetectable; }),
+  (function eq_L6() { return -0 == undetectable; }),
+  (function eq_L7() { return "" == undetectable; }),
+  (function eq_L8() { return -1 == undetectable; }),
+  (function eq_L9() { return -1.25 == undetectable; }),
+  (function eq_L10() { return 1 == undetectable; }),
+  (function eq_L11() { return 1.25 == undetectable; }),
+  (function eq_L12() { return -2147483648 == undetectable; }),
+  (function eq_L13() { return 2147483648 == undetectable; }),
+  (function eq_L14() { return Infinity == undetectable; }),
+  (function eq_L15() { return -Infinity == undetectable; }),
+  (function eq_L16() { return NaN == undetectable; })
+];
+
+var right_funcs = [
+  (function eq_R0() { return undetectable == true; }),
+  (function eq_R1() { return undetectable == false; }),
+  (function eq_R2() { return undetectable == null; }),
+  (function eq_R3() { return undetectable == void 0; }),
+  (function eq_R4() { return undetectable == 0; }),
+  (function eq_R5() { return undetectable == 0.0; }),
+  (function eq_R6() { return undetectable == -0; }),
+  (function eq_R7() { return undetectable == ""; }),
+  (function eq_R8() { return undetectable == -1; }),
+  (function eq_R9() { return undetectable == -1.25; }),
+  (function eq_R10() { return undetectable == 1; }),
+  (function eq_R11() { return undetectable == 1.25; }),
+  (function eq_R12() { return undetectable == -2147483648; }),
+  (function eq_R13() { return undetectable == 2147483648; }),
+  (function eq_R14() { return undetectable == Infinity; }),
+  (function eq_R15() { return undetectable == -Infinity; }),
+  (function eq_R16() { return undetectable == NaN; })
+];
+
+function test() {
+  for (var i = 0; i < tests.length; i += 2) {
+    var val = tests[i];
+    var eq = tests[i + 1];
+
+    assertEquals(eq, val == undetectable);
+    assertEquals(eq, undetectable == val);
+
+    assertFalse(val === undetectable);
+    assertFalse(undetectable === val);
+
+    assertEquals(eq, left_funcs[i/2]());
+    assertEquals(eq, right_funcs[i/2]());
+  }
+
+  assertTrue(undetectable == undetectable);
+  assertTrue(undetectable === undetectable);
+
+}
+
+for (var i = 0; i < 5; i++) {
+  test();
+}
+
+
+assertFalse(undetectable == %GetUndetectable());
+assertFalse(undetectable === %GetUndetectable());