1 files changed, 43 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/actions/pause/selectFrame.js b/devtools/client/debugger/src/actions/pause/selectFrame.js
new file mode 100644
index 0000000000..4344a1c00b
--- /dev/null
+++ b/devtools/client/debugger/src/actions/pause/selectFrame.js
@@ -0,0 +1,43 @@
+/* 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/>. */
+
+// @flow
+
+import { selectLocation } from "../sources";
+import { evaluateExpressions } from "../expressions";
+import { fetchScopes } from "./fetchScopes";
+import assert from "../../utils/assert";
+
+import type { Frame, ThreadContext } from "../../types";
+import type { ThunkArgs } from "../types";
+
+/**
+ * @memberof actions/pause
+ * @static
+ */
+export function selectFrame(cx: ThreadContext, frame: Frame) {
+  return async ({ dispatch, client, getState, sourceMaps }: ThunkArgs) => {
+    assert(cx.thread == frame.thread, "Thread mismatch");
+
+    // Frames that aren't on-stack do not support evalling and may not
+    // have live inspectable scopes, so we do not allow selecting them.
+    if (frame.state !== "on-stack") {
+      return dispatch(selectLocation(cx, frame.location));
+    }
+
+    dispatch({
+      type: "SELECT_FRAME",
+      cx,
+      thread: cx.thread,
+      frame,
+    });
+
+    // It's important that we wait for selectLocation to finish because
+    // we rely on the source being loaded and symbols fetched below.
+    await dispatch(selectLocation(cx, frame.location));
+
+    dispatch(evaluateExpressions(cx));
+    dispatch(fetchScopes(cx));
+  };
+}