1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/jit-test/lib/prologue.js b/js/src/jit-test/lib/prologue.js
new file mode 100644
index 0000000000..4e24b19836
--- /dev/null
+++ b/js/src/jit-test/lib/prologue.js
@@ -0,0 +1,29 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+var appendToActual = function(s) {
+    actual += s + ',';
+}
+
+// Add dummy versions of missing functions and record whether they
+// were originally present.
+let hasFunction = {};
+for (const name of ["gczeal",
+                    "schedulegc",
+                    "gcslice",
+                    "selectforgc",
+                    "verifyprebarriers",
+                    "verifypostbarriers",
+                    "gcPreserveCode",
+                    "setMarkStackLimit"]) {
+    const present = name in this;
+    if (!present) {
+        this[name] = function() {};
+    }
+    hasFunction[name] = present;
+}
+
+// Set the minimum heap size for parallel marking to zero for testing purposes.
+gcparam('parallelMarkingThresholdMB', 0);