prepack/lib/evaluators/CatchClause.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;

var _index = require("../values/index.js");

var _completions = require("../completions.js");

var _invariant = _interopRequireDefault(require("../invariant.js"));

var _singletons = require("../singletons.js");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
// ECAM262 13.15.7
function _default(ast, strictCode, env, realm, thrownValue) {
  (0, _invariant.default)(thrownValue instanceof _completions.ThrowCompletion, "Metadata isn't a throw completion"); // 1. Let oldEnv be the running execution context's LexicalEnvironment.

  let oldEnv = realm.getRunningContext().lexicalEnvironment; // 2. Let catchEnv be NewDeclarativeEnvironment(oldEnv).

  let catchEnv = _singletons.Environment.NewDeclarativeEnvironment(realm, oldEnv); // 3. Let catchEnvRec be catchEnv's EnvironmentRecord.


  let catchEnvRec = catchEnv.environmentRecord; // 4. For each element argName of the BoundNames of CatchParameter, do

  for (let argName of _singletons.Environment.BoundNames(realm, ast.param)) {
    // a. Perform ! catchEnvRec.CreateMutableBinding(argName, false).
    catchEnvRec.CreateMutableBinding(argName, false);
  } // 5. Set the running execution context's LexicalEnvironment to catchEnv.


  realm.getRunningContext().lexicalEnvironment = catchEnv;

  try {
    // 6. Let status be the result of performing BindingInitialization for CatchParameter passing thrownValue and catchEnv as arguments.
    _singletons.Environment.BindingInitialization(realm, ast.param, thrownValue.value, strictCode, catchEnv); // 7. If status is an abrupt completion, then
    // a. Set the running execution context's LexicalEnvironment to oldEnv.
    // b. Return Completion(status).
    // 8. Let B be the result of evaluating Block.


    let B = catchEnv.evaluate(ast.body, strictCode);
    (0, _invariant.default)(B instanceof _index.Value); // 10. Return Completion(B).

    return B;
  } finally {
    // 9. Set the running execution context's LexicalEnvironment to oldEnv.
    realm.getRunningContext().lexicalEnvironment = oldEnv;
    realm.onDestroyScope(catchEnv);
  }
}
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