1 files changed, 56 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/saved-stacks/principals-02.js b/js/src/jit-test/tests/saved-stacks/principals-02.js
new file mode 100644
index 0000000000..8253ce4566
--- /dev/null
+++ b/js/src/jit-test/tests/saved-stacks/principals-02.js
@@ -0,0 +1,56 @@
+// Test that SavedFrame.prototype.toString only shows frames whose principal is
+// subsumed by the caller's principal.
+
+var count = 0;
+
+// Given a string of letters |expected|, say "abc", assert that the stack
+// contains calls to a series of functions named by the next letter from
+// the string, say a, b, and then c. Younger frames appear earlier in
+// |expected| than older frames.
+function check(expected, stack) {
+  print("check(" + JSON.stringify(expected) + ") against:\n" + stack);
+  count++;
+
+  // Extract only the function names from the stack trace. Omit the frames
+  // for the top-level evaluation, if it is present.
+  const frames = stack
+    .split("\n")
+    .filter(f => f.match(/^.@/))
+    .map(f => f.replace(/@.*$/g, ""));
+
+  // Check the function names against the expected sequence.
+  assertEq(frames.length, expected.length);
+  for (var i = 0; i < expected.length; i++) {
+    assertEq(frames[i], expected[i]);
+  }
+}
+
+var low = newGlobal({ principal: 0 });
+var mid = newGlobal({ principal: 0xffff });
+var high = newGlobal({ principal: 0xfffff });
+
+     eval('function a() { check("a",        saveStack().toString()); b(); }');
+low .eval('function b() { check("b",        saveStack().toString()); c(); }');
+mid .eval('function c() { check("cba",      saveStack().toString()); d(); }');
+high.eval('function d() { check("dcba",     saveStack().toString()); e(); }');
+     eval('function e() { check("ecba",     saveStack().toString()); f(); }');
+low .eval('function f() { check("fb",       saveStack().toString()); g(); }');
+mid .eval('function g() { check("gfecba",   saveStack().toString()); h(); }');
+high.eval('function h() { check("hgfedcba", saveStack().toString());      }');
+
+// Make everyone's functions visible to each other, as needed.
+     b = low .b;
+low .c = mid .c;
+mid .d = high.d;
+high.e =      e;
+     f = low .f;
+low .g = mid .g;
+mid .h = high.h;
+
+low.check = mid.check = high.check = check;
+
+// Kick the whole process off.
+a();
+
+assertEq(count, 8);
+