1 files changed, 69 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/actions/pause/paused.js b/devtools/client/debugger/src/actions/pause/paused.js
new file mode 100644
index 0000000000..a7a631c28c
--- /dev/null
+++ b/devtools/client/debugger/src/actions/pause/paused.js
@@ -0,0 +1,69 @@
+/* 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/>. */
+
+import {
+  getHiddenBreakpoint,
+  isEvaluatingExpression,
+  getSelectedFrame,
+} from "../../selectors/index";
+
+import { mapFrames, fetchFrames } from "./index";
+import { removeBreakpoint } from "../breakpoints/index";
+import { evaluateExpressions } from "../expressions";
+import { selectLocation } from "../sources/index";
+import { validateSelectedFrame } from "../../utils/context";
+
+import { fetchScopes } from "./fetchScopes";
+
+/**
+ * Debugger has just paused
+ *
+ * @param {object} pauseInfo
+ *        See `createPause` method.
+ */
+export function paused(pauseInfo) {
+  return async function ({ dispatch, getState }) {
+    const { thread, frame, why } = pauseInfo;
+
+    dispatch({ type: "PAUSED", thread, why, topFrame: frame });
+
+    // When we use "continue to here" feature we register an "hidden" breakpoint
+    // that should be removed on the next paused, even if we didn't hit it and
+    // paused for any other reason.
+    const hiddenBreakpoint = getHiddenBreakpoint(getState());
+    if (hiddenBreakpoint) {
+      dispatch(removeBreakpoint(hiddenBreakpoint));
+    }
+
+    // The THREAD_STATE's "paused" resource only passes the top level stack frame,
+    // we dispatch the PAUSED action with it so that we can right away
+    // display it and update the UI to be paused.
+    // But we then fetch all the other frames:
+    await dispatch(fetchFrames(thread));
+    // And map them to original source locations.
+    // Note that this will wait for all related original sources to be loaded in the reducers.
+    // So this step may pause for a little while.
+    await dispatch(mapFrames(thread));
+
+    // If we paused on a particular frame, automatically select the related source
+    // and highlight the paused line
+    const selectedFrame = getSelectedFrame(getState(), thread);
+    if (selectedFrame) {
+      await dispatch(selectLocation(selectedFrame.location));
+      // We might have resumed while opening the location.
+      // Prevent further computation if this happens.
+      validateSelectedFrame(getState(), selectedFrame);
+
+      // Fetch the previews for variables visible in the currently selected paused stackframe
+      await dispatch(fetchScopes(selectedFrame));
+
+      // Run after fetching scoping data so that it may make use of the sourcemap
+      // expression mappings for local variables.
+      const atException = why.type == "exception";
+      if (!atException || !isEvaluatingExpression(getState(), thread)) {
+        await dispatch(evaluateExpressions(selectedFrame));
+      }
+    }
+  };
+}