Add m-esr52 at 52.6.0

1 files changed, 41 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/debug/gc-05.js b/js/src/jit-test/tests/debug/gc-05.js
new file mode 100644
index 000000000..e31253d75
--- /dev/null
+++ b/js/src/jit-test/tests/debug/gc-05.js
@@ -0,0 +1,41 @@
+// If a Debugger survives its debuggee, its object cache must still be swept.
+
+var g2arr = []; // non-debuggee globals
+var xarr = []; // debuggee objects
+
+var N = 4, M = 4;
+for (var i = 0; i < N; i++) {
+    var g1 = newGlobal();
+    g1.M = M;
+    var dbg = new Debugger(g1);
+    var g2 = g1.eval("newGlobal('same-compartment')");
+    g1.x = g2.eval("x = {};");
+
+    dbg.onDebuggerStatement = function (frame) { xarr.push(frame.eval("x").return); };
+    g1.eval("debugger;");
+    g2arr.push(g2);
+
+    g1 = null;
+    gc();
+}
+
+// At least some of the debuggees have probably been collected at this
+// point. It is nondeterministic, though.
+assertEq(g2arr.length, N);
+assertEq(xarr.length, N);
+
+// Try to make g2arr[i].eval eventually allocate a new object in the same
+// location as a previously gc'd object. If the object caches are not being
+// swept, the pointer coincidence will cause a Debugger.Object to be erroneously
+// reused.
+for (var i = 0; i < N; i++) {
+    var obj = xarr[i];
+    for (j = 0; j < M; j++) {
+        assertEq(obj instanceof Debugger.Object, true);
+        g2arr[i].eval("x = x.prop = {};");
+        obj = obj.getOwnPropertyDescriptor("prop").value;;
+        assertEq("seen" in obj, false);
+        obj.seen = true;
+        gc();
+    }
+}