Add m-esr52 at 52.6.0

1 files changed, 25 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/debug/gc-04.js b/js/src/jit-test/tests/debug/gc-04.js
new file mode 100644
index 000000000..8cc6dfe3f
--- /dev/null
+++ b/js/src/jit-test/tests/debug/gc-04.js
@@ -0,0 +1,25 @@
+// Storing a Debugger.Object as a key in a WeakMap protects it from GC as long as
+// the referent is alive.
+
+var g = newGlobal();
+var N = g.N = 10;
+var dbg = Debugger(g);
+var cache = new WeakMap;
+
+var i = 0;
+dbg.onDebuggerStatement = function (frame) {
+    cache.set(frame.arguments[0], i++);
+};
+g.eval("function f(x) { debugger; }");
+g.eval("var arr = [], j; for (j = 0; j < N; j++) arr[j] = {};");
+g.eval("for (j = 0; j < N; j++) f(arr[j]);");
+assertEq(i, N);
+
+gc(); gc();
+
+i = 0;
+dbg.onDebuggerStatement = function (frame) {
+    assertEq(cache.get(frame.arguments[0]), i++)
+};
+g.eval("for (j = 0; j < N; j++) f(arr[j]);");
+assertEq(i, N);