We might envision an ISP that smashes through the plodding local politics of digging fiber trenches by literally achieving escape velocity and delivering fast, reliable internet from the heavens above. Preventing Surprisingly Large Objective-C Type EncodingsĪutomatic Reference Counting (ARC) Compiler iOS iOS 14 iOS App LLVM Objective-C Open Source Optimization Programming Swift Programming Language Uber.They’re contributing the work back to LLVM. When this code is lowered into LLVM IR and then into the machine code, it leads into N blocks of codes where the N th block and N-1 th bock have N-1 same instructions, N-1 th and N-2 th block have N-2 same instructions and so on - which is a O(N 2) replicated code. If any one of the try expressions fails, all the previously created properties have to be released. The initialization happens via try expressions, which throw Error if the property is not found in the incoming JSON object. In this example, the class M圜lass contains 118 properties, which are initialized from a JSON object. Listing 7 above shows a common idiom recommended by Swift to use the try expressions to deserialize JSON data and assign to properties of a class. Generic function instantiations and closures specialized at their call sites result in highly similar, long sequences of machine instructions. High-level language and runtime features related to reference counting and memory allocation are common causes of the most frequently repeated patterns.
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The ideas discussed herein also translated to 17% and 19% code size savings in the Uber Driver and Uber Eats iOS apps, respectively.
In the following article we will describe how we reduced the code size of Uber’s iOS Rider app by 23% using advanced compiler technologies. Milind Chabbi, Jin Lin, and Raj Barik (via Hacker News):
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