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js_runtime: loadDeferredLibrary: don't call initializer of repeated empty parts

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Pre-filtering hunks to initialized ended up calling some initializations multiple times. This happened for empty parts, so was harmless after 4af03b1a65

Simplify logic to reduce use of corelib functions. There is no real need to be creating closures and calling all of List.generate, where, and map.

BUG=
R=sigmund@google.com

Review-Url: https://codereview.chromium.org/2893653005 .
This commit is contained in:
Stephen Adams 2017-05-18 14:16:40 -07:00
parent 9aafded095
commit 7983454299
1 changed files with 22 additions and 17 deletions
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39
sdk/lib/_internal/js_runtime/lib/js_helper.dart
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@ -3653,27 +3653,32 @@ Future<Null> loadDeferredLibrary(String loadId) {
// list of hashes. These are stored in the app-global scope.
var urisMap = JS_EMBEDDED_GLOBAL('', DEFERRED_LIBRARY_URIS);
List<String> uris = JS('JSExtendableArray|Null', '#[#]', urisMap, loadId);
if (uris == null) return new Future.value(null);
var hashesMap = JS_EMBEDDED_GLOBAL('', DEFERRED_LIBRARY_HASHES);
List<String> hashes = JS('JSExtendableArray|Null', '#[#]', hashesMap, loadId);
if (uris == null) return new Future.value(null);
// The indices into `uris` and `hashes` that we want to load.
List<int> indices = new List.generate(uris.length, (i) => i);
List<String> urisToLoad = <String>[];
var isHunkLoaded = JS_EMBEDDED_GLOBAL('', IS_HUNK_LOADED);
var isHunkInitialized = JS_EMBEDDED_GLOBAL('', IS_HUNK_INITIALIZED);
// Filter away indices for hunks that have already been loaded.
List<int> indicesToLoad = indices
.where((int i) => !JS('bool', '#(#)', isHunkLoaded, hashes[i]))
.toList();
return Future
.wait(indicesToLoad.map((int i) => _loadHunk(uris[i])))
.then((_) {
for (int i = 0; i < uris.length; ++i) {
if (JS('bool', '#(#)', isHunkLoaded, hashes[i])) continue;
urisToLoad.add(uris[i]);
}
return Future.wait(urisToLoad.map(_loadHunk)).then((_) {
// Now all hunks have been loaded, we run the needed initializers.
List<int> indicesToInitialize = indices
.where((int i) => !JS('bool', '#(#)', isHunkInitialized, hashes[i]))
.toList(); // Load the needed hunks.
for (int i in indicesToInitialize) {
var initializer = JS_EMBEDDED_GLOBAL('', INITIALIZE_LOADED_HUNK);
JS('void', '#(#)', initializer, hashes[i]);
var isHunkInitialized = JS_EMBEDDED_GLOBAL('', IS_HUNK_INITIALIZED);
var initializer = JS_EMBEDDED_GLOBAL('', INITIALIZE_LOADED_HUNK);
for (String hash in hashes) {
// It is possible for a hash to be repeated. This happens when two
// different parts both end up empty. Checking in the loop rather than
// pre-filtering prevents duplicate hashes leading to duplicated
// initializations.
// TODO(29572): Merge small parts.
// TODO(29635): Remove duplicate parts from tables and output files.
if (JS('bool', '#(#)', isHunkInitialized, hash)) continue;
JS('void', '#(#)', initializer, hash);
}
bool updated = _loadedLibraries.add(loadId);
if (updated && deferredLoadHook != null) {