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Introduction

This document describes the internal architecture of the Free Pascal Compiler version 1.9.x+ release. This document is meant to be used as a guide for those who wish to understand how the compiler was created.

The architecture, and the different passes of the compiler are shown in the following figure: (last updated for fpc version 1.0.x)

http://www.pjh2.de/fpc/CompilerInternalsFigure01.png

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From the Free Pascal wiki, page "Introduction", as it stood on 2020-05-24 after a change by E-ric, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.