The SubC Compiler

SubC is a fast and simple public domain compiler for a clean subset of the C programming language. It can compile itself and passes gcc -Wall -pedantic . Its internals are described in detail in the book

Note that SubC is a teaching vehicle rather than a production compiler. Check the README files to find out what it can and cannot do. If you are planning to do something more serious with SubC, you may want to get the current version rather than the book version.

Check out Quan Tran's Go version of SubC

(most of the critical bugs mentioned by him have been fixed by now)

The Windows runtime support code has been written by Jean-Marc Lienher (cod5.org). The Darwin back-end and startup module have been contributed by Romain LWPB. The Linux/x86-64 and NetBSD/386 runtime support as well as proper signal handling for NetBSD were provided by Minux. Thank you!

Targets

The current version supports the following platforms:

(The book version runs on FreeBSD/386 exclusively.)

FreeBSD 386 armv6 x86-64 Linux 386 x86-64 NetBSD 386 x86-64 OpenBSD (386) Windows/MinGW 386 Darwin (x86-64) DOS 8086

stable Regression-tested before release. Should just work. experimental Barely tested. Expect lots of bugs. broken Known not to build. Might require substantial hacking. (GLIBC) Uses GLIBC as a system call layer. Expect bugs!

No color? Please see the README in the archive for an ASCII rendition of the above table.

Major Changes since the Book Version

New Platforms

See above.

Internal

Improved code generator

Added optimizer

Changed calling conventions to standard C (right-to-left), removed __argc hack

Language Level

Added #error , #line , and #pragma commands

, , and commands Added support for structs and unions

Prototypes may have the static storage class

Extern identifiers may be declared locally

Enums may be local

The auto and register keywords are recognized (as no-ops)

and keywords are recognized (as no-ops) &array is valid syntax

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