1 files changed, 87 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/saved-stacks/gc-frame-cache.js b/js/src/jit-test/tests/saved-stacks/gc-frame-cache.js
new file mode 100644
index 000000000..cf2646f47
--- /dev/null
+++ b/js/src/jit-test/tests/saved-stacks/gc-frame-cache.js
@@ -0,0 +1,87 @@
+// Test that SavedFrame instances get removed from the SavedStacks frames cache
+// after a GC.
+
+const FUZZ_FACTOR = 3;
+
+function isAboutEq(actual, expected) {
+  return Math.abs(actual - expected) <= FUZZ_FACTOR;
+}
+
+var stacks = [];
+
+(function () {
+  // Use an IIFE here so that we don't keep these saved stacks alive in the
+  // frame cache when we test that they all go away at the end of the test.
+
+  var startCount = getSavedFrameCount();
+  print("startCount = " + startCount);
+
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+  stacks.push(saveStack());
+
+  gc();
+
+  var endCount = getSavedFrameCount();
+  print("endCount = " + endCount);
+
+  assertEq(isAboutEq(endCount - startCount, 50), true);
+}());
+
+while (stacks.length) {
+  stacks.pop();
+}
+gc();
+
+stacks = null;
+gc();
+
+assertEq(isAboutEq(getSavedFrameCount(), 0), true);