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1. Kaleidoscope: Kaleidoscope Introduction and the Lexer — LLVM 20.0.0git documentation

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This tutorial is illustrated with a toy language called “Kaleidoscope” (derived from “meaning beautiful, form, and view”). Kaleidoscope is a procedural language that allows you to define functions, use conditionals, math, etc. Over the course of the tutorial, we’ll extend Kaleidoscope to support the if/then/else construct, a for loop, user defined operators, JIT compilation with a simple command line interface, debug info, etc. We want to keep things simple, so the only datatype in Kaleidoscope is a 64-bit floating point type (aka ‘double’ in C parlance). As such, all values are implicitly double precision and the language doesn’t require type declarations. This gives the language a very nice and simple syntax. For example, the following simple example computes Fibonacci numbers: We also allow Kaleidoscope to call into standard library functions - the LLVM JIT makes this really easy. This means that you can use the ‘extern’ keyword to define a function before you use it (this is also u

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