[debug-wrapper] LiveEdit, frame.restart(), breakpoints

test/mjsunit/harmony/debug-async-liveedit.js

-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --harmony-async-await
-// Flags: --expose-debug-as debug --allow-natives-syntax
-
-var Debug = debug.Debug;
-var LiveEdit = Debug.LiveEdit;
-
-unique_id = 0;
-
-var AsyncFunction = (async function(){}).constructor;
-
-function assertPromiseValue(value, promise) {
-  promise.then(resolve => {
-    went = true;
-    if (resolve !== value) {
-      print(`expected ${value} found ${resolve}`);
-      quit(1);
-    }
-  }, reject => {
-    print(`rejected ${reject}`);
-    quit(1);
-  });
-}
-
-function MakeAsyncFunction() {
-  // Prevents eval script caching.
-  unique_id++;
-  return AsyncFunction('callback',
-      "/* " + unique_id + "*/\n" +
-      "await callback();\n" +
-      "return 'Cat';\n");
-}
-
-function MakeFunction() {
-  // Prevents eval script caching.
-  unique_id++;
-  return Function('callback',
-      "/* " + unique_id + "*/\n" +
-      "callback();\n" +
-      "return 'Cat';\n");
-}
-
-// First, try MakeGenerator with no perturbations.
-(function(){
-  var asyncfn = MakeAsyncFunction();
-  function callback() {};
-  var promise = asyncfn(callback);
-  assertPromiseValue('Cat', promise);
-})();
-
-function patch(fun, from, to) {
-  function debug() {
-    var log = new Array();
-    var script = Debug.findScript(fun);
-    var pos = script.source.indexOf(from);
-    print(`pos ${pos}`);
-    try {
-      LiveEdit.TestApi.ApplySingleChunkPatch(script, pos, from.length, to,
-                                             log);
-    } finally {
-      print("Change log: " + JSON.stringify(log) + "\n");
-    }
-  }
-  %ExecuteInDebugContext(debug);
-}
-
-// Try to edit a MakeAsyncFunction while it's running, then again while it's
-// stopped.
-(function(){
-  var asyncfn = MakeAsyncFunction();
-
-  var patch_attempted = false;
-  function attempt_patch() {
-    assertFalse(patch_attempted);
-    patch_attempted = true;
-    assertThrows(function() { patch(asyncfn, "'Cat'", "'Capybara'") },
-                 LiveEdit.Failure);
-  };
-  var promise = asyncfn(attempt_patch);
-  // Patch should not succeed because there is a live async function activation
-  // on the stack.
-  assertPromiseValue("Cat", promise);
-  assertTrue(patch_attempted);
-
-  %RunMicrotasks();
-
-  // At this point one iterator is live, but closed, so the patch will succeed.
-  patch(asyncfn, "'Cat'", "'Capybara'");
-  promise = asyncfn(function(){});
-  // Patch successful.
-  assertPromiseValue("Capybara", promise);
-
-  // Patching will fail however when an async function is suspended.
-  var resolve;
-  promise = asyncfn(function(){return new Promise(function(r){resolve = r})});
-  assertThrows(function() { patch(asyncfn, "'Capybara'", "'Tapir'") },
-               LiveEdit.Failure);
-  resolve();
-  assertPromiseValue("Capybara", promise);
-
-  // Try to patch functions with activations inside and outside async
-  // function activations.  We should succeed in the former case, but not in the
-  // latter.
-  var fun_outside = MakeFunction();
-  var fun_inside = MakeFunction();
-  var fun_patch_attempted = false;
-  var fun_patch_restarted = false;
-  function attempt_fun_patches() {
-    if (fun_patch_attempted) {
-      assertFalse(fun_patch_restarted);
-      fun_patch_restarted = true;
-      return;
-    }
-    fun_patch_attempted = true;
-    // Patching outside an async function activation must fail.
-    assertThrows(function() { patch(fun_outside, "'Cat'", "'Cobra'") },
-                 LiveEdit.Failure);
-    // Patching inside an async function activation may succeed.
-    patch(fun_inside, "'Cat'", "'Koala'");
-  }
-  promise = asyncfn(function() { return fun_inside(attempt_fun_patches) });
-  assertEquals('Cat',
-               fun_outside(function () {
-                 assertPromiseValue('Capybara', promise);
-                 assertTrue(fun_patch_restarted);
-                 assertTrue(fun_inside.toString().includes("'Koala'"));
-               }));
-})();
-
-%RunMicrotasks();