1 files changed, 83 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/watchtower/megamorphic-invalidate.js b/js/src/jit-test/tests/watchtower/megamorphic-invalidate.js
new file mode 100644
index 0000000000..670da583b6
--- /dev/null
+++ b/js/src/jit-test/tests/watchtower/megamorphic-invalidate.js
@@ -0,0 +1,83 @@
+// |jit-test| --enable-watchtower
+
+setJitCompilerOption("ic.force-megamorphic", 1);
+
+function testAddToIntermediate() {
+  var C = Object.create(null);
+  var B = Object.create(C);
+  var A = Object.create(B);
+  C.x = 1;
+  for (var i = 0; i < 50; i++) {
+    assertEq(A.x, i <= 45 ? 1 : 0);
+    if (i === 45) {
+      B.x = 0;
+    }
+  }
+}
+for (var i = 0; i < 5; i++) {
+  testAddToIntermediate();
+}
+
+function testAddToReceiver() {
+  var C = Object.create(null);
+  var B = Object.create(C);
+  var A = Object.create(B);
+  C.x = 1;
+  for (var i = 0; i < 50; i++) {
+    assertEq(A.x, i <= 45 ? 1 : 0);
+    if (i === 45) {
+      A.x = 0;
+    }
+  }
+}
+for (var i = 0; i < 5; i++) {
+  testAddToReceiver();
+}
+
+function testDelete() {
+  var C = Object.create(null);
+  var B = Object.create(C);
+  var A = Object.create(B);
+  C.x = 1;
+  for (var i = 0; i < 50; i++) {
+    assertEq(A.x, i <= 45 ? 1 : undefined);
+    if (i === 45) {
+      delete C.x;
+    }
+  }
+}
+for (var i = 0; i < 5; i++) {
+  testDelete();
+}
+
+function testDataToAccessor() {
+  var C = Object.create(null);
+  var B = Object.create(C);
+  var A = Object.create(B);
+  C.x = 1;
+  for (var i = 0; i < 50; i++) {
+    assertEq(A.x, i <= 45 ? 1 : 7);
+    if (i === 45) {
+      Object.defineProperty(C, "x", {get: () => 7});
+    }
+  }
+}
+for (var i = 0; i < 5; i++) {
+  testDataToAccessor();
+}
+
+function testProtoChange() {
+  var C = Object.create(null);
+  var B = Object.create(C);
+  var A = Object.create(B);
+  C.x = 1;
+  for (var i = 0; i < 50; i++) {
+    assertEq(A.x, i <= 45 ? 1 : 8);
+    if (i === 45) {
+      Object.setPrototypeOf(B, {a: 0, b: 1, x: 8});
+    }
+  }
+}
+for (var i = 0; i < 5; i++) {
+  testProtoChange();
+}