1 files changed, 236 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/fields/private-field-basics.js b/js/src/jit-test/tests/fields/private-field-basics.js
new file mode 100644
index 0000000000..9b1fb2431c
--- /dev/null
+++ b/js/src/jit-test/tests/fields/private-field-basics.js
@@ -0,0 +1,236 @@
+// |jit-test| --enable-private-fields;
+
+
+class A {
+  #x = 10
+
+  x() {
+    return this.#x;
+  }
+  ix() {
+    this.#x++;
+  }
+  static readx(o) {
+    return o.#x;
+  }
+  static optionalx(o) {
+    return o?.#x;
+  }
+
+  #y = () => 'hi';
+  invoke() {
+    return this.#y();
+  }
+
+  static #z = 'static';
+  gz() {
+    return A.#z;
+  }
+
+  sz(o) {
+    A.#z = o;
+  }
+
+  static sgz() {
+    return this.#z;
+  }
+
+  static ssz(o) {
+    this.#z = o;
+  }
+
+  static six(o) {
+    o.#x++;
+  }
+
+  static dix(o) {
+    o.#x--;
+  }
+};
+
+for (var i = 0; i < 1000; i++) {
+  var a = new A();
+  assertEq(a.x(), 10);
+  a.ix();
+  assertEq(a.x(), 11);
+  assertEq(A.readx(a), 11);
+  assertEq(a.invoke(), 'hi');
+  assertEq(a.gz(), 'static');
+  assertEq(A.sgz(), 'static');
+  A.ssz(i);
+  assertEq(A.sgz(), i);
+  a.sz(i + 1);
+  assertEq(A.sgz(), i + 1);
+  A.ssz('static');  // reset for next iteration!
+
+  assertEq(A.optionalx(a), 11);
+  assertEq(A.optionalx(null), undefined);
+  try {
+    A.optionalx({});  // Should throw type error
+    assertEq(0, 1);
+  } catch (TypeError) {
+  }
+}
+
+function assertThrows(fun, errorType) {
+  try {
+    fun();
+    throw 'Expected error, but none was thrown';
+  } catch (e) {
+    if (!(e instanceof errorType)) {
+      throw 'Wrong error type thrown';
+    }
+  }
+}
+
+function testTypeErrors(v) {
+  assertThrows(() => A.readx(v), TypeError);  // Read value
+  assertThrows(() => A.six(v), TypeError);    // increment
+  assertThrows(() => A.dix(v), TypeError);    // decrement
+}
+
+testTypeErrors(undefined);  // Undefined
+testTypeErrors({});         // Random object
+testTypeErrors(1);          // Random primitive
+
+assertThrows(
+    () => eval('class B extends class { #x; } { g() { return super.#x; } }'),
+    SyntaxError);  // Access super.#private
+assertThrows(
+    () => eval('class C { #x = 10; static #x = 14; }'),
+    SyntaxError);  // Duplicate name declaration.
+assertThrows(
+    () => eval('delete this.#x'),
+    SyntaxError);  // deleting a private field in non-strict mode.
+
+class B extends class {
+  constructor(o) {
+    return o;
+  }
+}
+{
+  #x = 12;
+  static gx(o) {
+    return o.#x;
+  }
+  static sx(o) {
+    o.#x++;
+  }
+}
+
+var bn = new B(1);
+var bu = new B(undefined);
+
+// Test we can read an outer classes private fields.
+class Outer {
+  #outer = 3;
+  test() {
+    let outerThis = this;
+    class Inner {
+      #inner = 2;
+      test() {
+        return outerThis.#outer;
+      }
+    }
+    return new Inner().test();
+  }
+}
+
+var o = new Outer;
+assertEq(o.test(), 3);
+
+// IC tests:
+
+var alreadyConstructedB = new B();
+assertEq(B.gx(alreadyConstructedB), 12);
+
+function initIC(o) {
+  new B(o);
+}
+var array = [];
+// warm up init IC
+for (var i = 1; i < 1000; i++) {
+  var newB = {};
+  initIC(newB);
+}
+
+// Successfully catch double initialization type error.
+assertThrows(() => initIC(alreadyConstructedB), TypeError);
+// Do it again, to make sure we didn't attach a stub that is invalid.
+assertThrows(() => initIC(alreadyConstructedB), TypeError);
+
+// Test getters work, and ICs can't be tricked. Setup an array of
+//
+//    [B, B, B, B, ..., {}, {}]
+//
+// Then test that as we execute the sudden appearance of {} doesn't
+// trick our ICs into setting or getting anything -- do it twice
+// to make sure that we didn't get a stub that is invalid.
+var elements = [];
+for (var i = 0; i < 99; i++) {
+  elements.push(new B);
+}
+elements.push({});
+elements.push({});
+
+function getterCheck(e) {
+  assertEq(B.gx(e), 12);
+}
+
+function setterCheck(e) {
+  B.sx(e);
+}
+
+var checksPassed = 0;
+try {
+  for (var e of elements) {
+    getterCheck(e);
+    checksPassed++;
+  }
+  throw `Shouldn't arrive here`;
+} catch (e) {
+  if (!(e instanceof TypeError)) {
+    throw e;
+  }
+  // All but last element should have done the right thing.
+  assertEq(checksPassed, elements.length - 2);
+}
+
+checksPassed = 0;
+try {
+  for (var e of elements) {
+    setterCheck(e);
+    checksPassed++;
+  }
+  throw `Shouldn't arrive here`;
+} catch (e) {
+  if (!(e instanceof TypeError)) {
+    throw e;
+  }
+  // All but last element should have done the right thing.
+  assertEq(checksPassed, elements.length - 2);
+}
+
+// Verify setter did the thing, but throws in the correct places
+for (var index in elements) {
+  if (index < elements.length - 2) {
+    assertEq(B.gx(elements[index]), 13);
+  } else {
+    assertThrows(() => {
+      B.gx(elements[index]);
+    }, TypeError);
+  }
+}
+
+// Megamorphic Cache Testing:
+for (var i = 0; i < 100; i++) {
+  var inputs = [{a: 1}, {b: 2}, {c: 3}, {d: 4}, {e: 5}, new Proxy({}, {})];
+  for (var o of inputs) {
+    assertThrows(() => B.gx(o), TypeError);
+    assertThrows(() => B.sx(o), TypeError);
+    new B(o);
+    assertEq(B.gx(o), 12);
+    B.sx(o);
+    assertEq(B.gx(o), 13);
+  }
+}