2195c3282a
These changes were originally submitted separately on different days, and a major performance regression was seen after the first change when creating snapshots that led to both being reverted. However, that performance regression should be addressed by the followup. First change: "[vm] Treat the dispatch table as a root in the snapshot. Additional changes: * Only serialize a dispatch table in precompiled snapshots. * Add information in v8 snapshot profiles for the dispatch table. * Fix a typo in a field name. * Print the number of Instructions objects (or payloads, for precompiled bare instructions mode) in the fake cluster for the data section. * Fix v8 snapshots profiles so objects in memory mapped segments and only those are prefixed with "(RO) ". * Add names for Instructions objects in v8 snapshot profiles when we can use the assembly namer. * Add command line flag for old #define'd false flag." Second change: "[vm/aot] Keep GC-visible references to dispatch table Code entries. This change splits dispatch table handling into four distinct parts: * The dispatch table generator does not make a dispatch table directly, but rather creates an Array that contains the Code objects for dispatch table entries. * The precompiler takes this Array and puts it in the object store, which makes it a new GC root. * The serializer takes this information and serializes the dispatch table information in the same form as before. * The deserializer creates a DispatchTable object and populates it using the serialized information. The change in the precompiler ensures that the Code objects used in the dispatch table have GC-visible references. Thus, even if all other references to them from the other GC roots were removed, they would be accessible in the serializer in the case of a GC pass between the precompiler and serializer. This change also means that the serializer can retrieve and trace the Code objects directly rather than first looking up the Code objects by their entry point." Bug: https://github.com/dart-lang/sdk/issues/41022 Change-Id: I52c83b0536fc588da0bef9aed1f0c72e8ee4663f Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-release-simarm-try,vm-kernel-precomp-linux-release-simarm64-try,vm-kernel-precomp-linux-release-simarm_x64-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-precomp-android-release-arm_x64-try,vm-kernel-precomp-mac-release-simarm64-try,vm-kernel-precomp-win-release-x64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/139285 Commit-Queue: Teagan Strickland <sstrickl@google.com> Reviewed-by: Alexander Aprelev <aam@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> |
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Dart
A client-optimized language for fast apps on any platform
Dart is:
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Optimized for UI: Develop with a programming language specialized around the needs of user interface creation
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Productive: Make changes iteratively: use hot reload to see the result instantly in your running app
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Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web
Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
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Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.
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Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
License & patents
Dart is free and open source.
See LICENSE and PATENT_GRANT.
Using Dart
Visit the dart.dev to learn more about the language, tools, getting started, and more.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
Building Dart
If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
There are more documents on our wiki.
Contributing to Dart
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.