Write a compiler from scratch

This post made the front page of HNand I've incorporated some of the discussion feedback. I've also written a follow-up post that JITs Python bytecode to x The complete code is available on github. The goal is to generate new versions of the below assembly code at runtime and execute it.

Write a compiler from scratch

Compiler Basics, Part 2: Building the Scanner Have you ever thought of writing your own compiler? There are a number of good reasons to do this.

It can solve problems and produce abstractions that can simplify some previously complex procedures. However, there are just as many reasons not to write your own compiler. Good compilers already exist. When I first started exploring compiler development, I was frustrated that the available material tended toward the high end.

Off we go (lexer and parser)

Most programmers can find endless entertainment writing a compiler for a simple Basic-style dialect. At the end of the day, you should have enough experience to write useful compilers that can replace poor-performing interpreters in a number of applications. I might also explore ready-to-use compilers and scripting languages such as JavaScript and Lua.

But I want to start by showing you what you can produce on your own. The first thing I need is a way to read the original source code. I need a simple abstraction to load the contents of a text file into memory.

A memory-mapped file is often the best choice. Of course, I want to hide the details away from my main program. Perhaps something like this: Begin ; Scanner scanner file. I should be able to use the explicit Boolean operator of the class to check for failure.

Because this will be implemented with the Windows API, the main function could even use the GetLastError function to determine the specific reason for the failure. The FileMap class should provide a Size method, as well as Begin and End methods, for convenient access to the file contents.

That would avoid a lot of boilerplate code. Now, the particular mechanics.

C - How to write a very basic compiler - Software Engineering Stack Exchange

A memory-mapped file involves three objects or resources. First, you need to create the file object representing the file on disk. Then, you need to use the resulting file handle to create a file mapping object. Next, you need to map a view of the file using the file mapping handle.

Although the API makes it appear as if the view is just a pointer, that pointer is really a resource that needs managing, just like the file and file mapping objects.So you want to write a C++ compiler! Just parsing C++ is a monumental effort. Most programmers can find endless entertainment writing a compiler for .

P.D. Terry has granted permission to include his text on compiler construction on Webster. If you are not familiar with compiler concepts like grammars, lexical analysis, parsing, and other subjects, this book is an excellent introduction to the subject.

VibrantCode - Writing a Compiler from Scratch - Part 1 So, do you know how compilers and interpreters work?
The boiler-plate part Make it efficient This classic sequence applies to all software development, but bears repetition.
The fun part The Assembler Developer's Kit As far as computer languages go, most assembly languages have a fairly simple syntax. As a result, many programmers have actually written their own assembler.
Write a compiler from scratch in C - Stack Overflow But like all benchmarks, this one is probably still very innaccurate.

Possible Duplicate: How to code a compiler in C? How would I start writing a compiler from scratch (no Flex or Bison or Lex or Yacc) in C?I have a language that I wrote an interpreter for, and it's kind of like barnweddingvt.com of. Scratch++ Compiler V Created by nXIII.

write a compiler from scratch

Must be downloaded to write code. New in V NOTE: While V is not technically a rewrite, it is VERY different from V, which is why it is not V It teaches you how to write a compiler from scratch using LLVM's framework, and doesn't assume you have any knowledge about the subject.

The tutorial suggest you write your own parser and lexer etc, but I advise you to look into bison and flex once you get the idea. They make life so much easier. Feb 19,  · I've got a Scratch compiler in beta test now. The compiler is written in C# and so compiles barnweddingvt.com cil. Currently it only creates executables for Windows but hopefully this can be moved onto mono and hence Linux, Mac and even the raspberry pi.

language agnostic - Learning to write a compiler - Stack Overflow