paused.js - mozsearch

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/* 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());

      // We might have resumed while fetching the scopes

      // Prevent further computation if this happens.

      validateSelectedFrame(getState(), 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));

        validateSelectedFrame(getState(), selectedFrame);

};