Translating DART to Efficient JavaScript • Kasper Lund • GOTO 2012

This presentation was recorded at GOTO Aarhus 2012
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Kasper Lund - Google V8 Team and Dart Team

ABSTRACT
Dart is a new programming language for the web. To make Dart run in all modern browsers, we have implemented an optimizing Dart-to-JavaScript compiler. Performance-wise the biggest challenge is the gap between the semantics of Dart's low-level operators and JavaScript's builtin primitives. This presentation will introduce you to the Dart language and the deployment options before diving into the details of the intermediate representation and the implemented optimizations.

TIMECODES
0:00 Introduction
1:17 What is Dart?
3:04 Dart execution and deployment
4:12 Dart-to-JavaScript compiler goals
7:52 Example: What's the point?
13:05 Code after tree shaking
13:48 User-definable operators
17:34 Compiled JavaScript code
19:36 Compact class definitions
23:03 Closures
24:46 Source code in Dart
27:23 Intermediate representations
27:53 SSA: Basic block graph
30:53 SSA: Dominator tree
33:33 Global value numbering (1)
35:29 Global value numbering algorithm
37:51 Speculative optimizations
42:00 Profile guided optimizations
42:34 Dealing with control flow
44:38 Code size
45:55 Performance
47:50 Conclusions

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