1 files changed, 73 insertions, 0 deletions
diff --git a/remote/shared/Stack.sys.mjs b/remote/shared/Stack.sys.mjs
new file mode 100644
index 0000000000..4611dbb04f
--- /dev/null
+++ b/remote/shared/Stack.sys.mjs
@@ -0,0 +1,73 @@
+/* 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/. */
+
+/**
+ * An object that contains details of a stack frame.
+ *
+ * @typedef {Object} StackFrame
+ * @see nsIStackFrame
+ *
+ * @property {String=} asyncCause
+ *     Type of asynchronous call by which this frame was invoked.
+ * @property {Number} columnNumber
+ *     The column number for this stack frame.
+ * @property {String} filename
+ *     The source URL for this stack frame.
+ * @property {String} function
+ *     SpiderMonkey’s inferred name for this stack frame’s function, or null.
+ * @property {Number} lineNumber
+ *     The line number for this stack frame (starts with 1).
+ * @property {Number} sourceId
+ *     The process-unique internal integer ID of this source.
+ */
+
+/**
+ * Return a list of stack frames from the given stack.
+ *
+ * Convert stack objects to the JSON attributes expected by consumers.
+ *
+ * @param {Object} stack
+ *     The native stack object to process.
+ *
+ * @returns {Array<StackFrame>=}
+ */
+export function getFramesFromStack(stack) {
+  if (!stack || (Cu && Cu.isDeadWrapper(stack))) {
+    // If the global from which this error came from has been nuked,
+    // stack is going to be a dead wrapper.
+    return null;
+  }
+
+  const frames = [];
+  while (stack) {
+    frames.push({
+      asyncCause: stack.asyncCause,
+      columnNumber: stack.column,
+      filename: stack.source,
+      functionName: stack.functionDisplayName || "",
+      lineNumber: stack.line,
+      sourceId: stack.sourceId,
+    });
+
+    stack = stack.parent || stack.asyncParent;
+  }
+
+  return frames;
+}
+
+/**
+ * Check if a frame is from chrome scope.
+ *
+ * @param {Object} frame
+ *     The frame to check
+ *
+ * @returns {boolean}
+ *     True, if frame is from chrome scope
+ */
+export function isChromeFrame(frame) {
+  return (
+    frame.filename.startsWith("chrome://") ||
+    frame.filename.startsWith("resource://")
+  );
+}