1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Script-getEffectfulOffsets.js b/js/src/jit-test/tests/debug/Script-getEffectfulOffsets.js
new file mode 100644
index 0000000000..49289a946f
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Script-getEffectfulOffsets.js
@@ -0,0 +1,33 @@
+// Check that Script.getEffectfulOffsets behaves sensibly.
+
+var g = newGlobal({newCompartment: true});
+var dbg = Debugger(g);
+var numEffectfulOperations;
+
+function onNewScript(script) {
+  script.getChildScripts().forEach(onNewScript);
+  numEffectfulOperations += script.getEffectfulOffsets().length;
+}
+dbg.onNewScript = onNewScript;
+
+function test(code, expected) {
+  numEffectfulOperations = 0;
+  g.eval(`
+function f(a, b, c) {
+${code}
+}
+`);
+  assertEq(numEffectfulOperations, expected);
+}
+
+test("a.f = 0", 2);
+test("a.f++", 2);
+test("return a.f", 1);
+test("a[b] = 0", 2);
+test("a[b]++", 2);
+test("return a[b]", 1);
+test("a = 0", 1);
+test("d = 0", 2);
+test("with (a) { b = 0; }", 4);
+test("let o = {}; ({x: o.x} = { x: 10 })", 2);
+test("var x", 1);