After that, it is transformed into LLVM IR (short for Intermediate Representation). Then, it is transformed into SIL (short for Swift Intermediate Language), first into a raw SIL and then into a canonical SIL. To better understand the entire process, refer to this flow diagram:įirst, the Swift source code is transformed into an AST (short for Abstract Syntax Tree). The Swift compiler uses LLVM for optimisation and binary generation. The compilation of the Swift source code is quite an interesting process, and it involves several steps. This unique combination of syntax, powerful features, safety, and performance makes Swift a very amazing programming language. Swift is also built to be nice to write, with a pleasant and clean syntax and modern features and types. Because Swift doesn’t do this at runtime, it has a very big performance gain.īy mixing strongly typed rules and compiling to assembly code, Swift can analyse code very well and perform very good assembly code optimization. In comparison, Java and C# are compiled to a piece of intermediate code, and it needs a virtual machine to run it, or another tool that will translate it into machine instructions. Running native machine code instructions is the fastest way of doing this. Its source code is compiled to the assembly code and the assembly code is compiled to the machine code using the LLVM tool. Swift is also a static programming language. Swift is very strict about types, and it verifies that all types are used correctly in the source code. This makes it a very safe programming language. Swift is a strongly typed compiled programming language. In this blog, I will be explaining why and how swift achieves above mentioned qualities.ĭiscovering All the Underlying Swift Power While introducing Swift in WWDC14 Tim Cook described it using four words which are: Developed by team led by Chris Lattner at Apple. It is a general purpose, multi-paradigm, statically typed language. Swift was in limelight during last 2 years and was ranked #1 most loved programming language of 2015.
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