1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Script-parameterNames.js b/js/src/jit-test/tests/debug/Script-parameterNames.js
new file mode 100644
index 0000000000..1557a97e22
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Script-parameterNames.js
@@ -0,0 +1,36 @@
+load(libdir + "asserts.js");
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger;
+var gDO = dbg.addDebuggee(g);
+
+function check(expr, expected) {
+  let completion = gDO.executeInGlobal(expr);
+  if (completion.throw)
+    throw completion.throw.unsafeDereference();
+
+  let fn = completion.return;
+  if (expected === undefined)
+    assertEq(fn.script.parameterNames, undefined);
+  else
+    assertDeepEq(fn.script.parameterNames, expected);
+}
+
+check('(function () {})', []);
+check('(function (x) {})', ["x"]);
+check('(function (x = 1) {})', ["x"]);
+check('(function (a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z) {})',
+      ["a","b","c","d","e","f","g","h","i","j","k","l","m",
+       "n","o","p","q","r","s","t","u","v","w","x","y","z"]);
+check('(function (a, [b, c], {d, e:f}) { })',
+      ["a", undefined, undefined]);
+check('(async function (a, b, c) {})', ["a", "b", "c"]);
+check('(async function* (d, e, f) {})', ["d", "e", "f"]);
+
+// Non-function scripts have |undefined| parameterNames.
+var log = [];
+dbg.onEnterFrame = function(frame) {
+  log.push(frame.script.parameterNames);
+};
+g.evaluate("function foo(a, b) { return eval('1'); }; foo();");
+assertDeepEq(log, [undefined, ["a", "b"], undefined]); // global, function, eval