1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/bug1580246.js b/js/src/jit-test/tests/bug1580246.js
new file mode 100644
index 0000000000..e6bd0173d2
--- /dev/null
+++ b/js/src/jit-test/tests/bug1580246.js
@@ -0,0 +1,59 @@
+load(libdir + "./asserts.js");
+
+// Exercise object-literal creation. Many other tests also exercise details of
+// objects created by object literals -- e.g., byteSize-of-objects.js. Here we
+// simply want to hit the cases {run-once ctx, repeated ctx} x {constant,
+// parameterized} x {small, large}.
+
+function build_large_literal(var_name, num_keys, extra) {
+  let s = "var " + var_name + " = {";
+  for (let i = 0; i < num_keys; i++) {
+    s += "prop" + i + ": " + i + ",";
+  }
+  s += extra;
+  s += "};";
+  return s;
+}
+
+let small_singleton = {a: 1, b: 2, 0: "I'm an indexed property" };
+// Large enough to force dictionary mode -- should inhibit objliteral use in
+// frontend:
+eval(build_large_literal("large_singleton", 513, ""));
+
+let an_integer = 42;
+let small_singleton_param = { a: 1, b: 2, c: an_integer };
+eval(build_large_literal("large_singleton_param", 513, "prop_int: an_integer"));
+
+function f(a_parameterized_integer) {
+  let small_templated = {a: 1, b: 2, 0: "I'm an indexed property" };
+  // Large enough to force dictionary mode -- should inhibit objliteral use in
+  // frontend:
+  eval(build_large_literal("large_templated", 513, ""));
+
+  let small_templated_param = { a: 1, b: 2, c: a_parameterized_integer };
+  eval(build_large_literal("large_templated_param", 513, "prop_int: a_parameterized_integer"));
+
+  return {small_templated, large_templated,
+          small_templated_param, large_templated_param};
+}
+
+for (let i = 0; i < 10; i++) {
+  let {small_templated, large_templated,
+       small_templated_param, large_templated_param} = f(42);
+
+  assertDeepEq(small_templated, small_singleton);
+  assertDeepEq(large_templated, large_singleton);
+  assertDeepEq(small_templated_param, small_singleton_param);
+  assertDeepEq(large_templated_param, large_singleton_param);
+}
+
+let small_lit_array = [0, 1, 2, 3];
+let large_cow_lit_array = [0, 1, 2, 3, 4, 5, 6, 7];
+assertEq(4, small_lit_array.length);
+assertEq(8, large_cow_lit_array.length);
+for (let i = 0; i < small_lit_array.length; i++) {
+  assertEq(i, small_lit_array[i]);
+}
+for (let i = 0; i < large_cow_lit_array.length; i++) {
+  assertEq(i, large_cow_lit_array[i]);
+}