1 files changed, 73 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..0e797035a5
--- /dev/null
+++ b/devtools/client/debugger/src/actions/pause/paused.js
@@ -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/>. */
+
+import {
+  getHiddenBreakpoint,
+  isEvaluatingExpression,
+  getSelectedFrame,
+  getThreadContext,
+} from "../../selectors";
+
+import { mapFrames, fetchFrames } from ".";
+import { removeBreakpoint } from "../breakpoints";
+import { evaluateExpressions } from "../expressions";
+import { selectLocation } from "../sources";
+import assert from "../../utils/assert";
+
+import { fetchScopes } from "./fetchScopes";
+
+/**
+ * Debugger has just paused
+ *
+ * @param {object} pauseInfo
+ * @memberof actions/pause
+ * @static
+ */
+export function paused(pauseInfo) {
+  return async function ({ dispatch, getState }) {
+    const { thread, frame, why } = pauseInfo;
+
+    dispatch({ type: "PAUSED", thread, why, frame });
+
+    // Get a context capturing the newly paused and selected thread.
+    const cx = getThreadContext(getState());
+    // Note that this is a rethorical assertion as threadcx.thread is updated by PAUSED action
+    assert(cx.thread == thread, "Thread mismatch");
+
+    // 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(cx, 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(cx));
+    // 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(cx));
+
+    // 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(cx, selectedFrame.location));
+    }
+
+    // Fetch the previews for variables visible in the currently selected paused stackframe
+    await dispatch(fetchScopes(cx));
+
+    // 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(cx));
+    }
+  };
+}