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The Stupid D Compiler
D C C++ Other
Branch: master

Use 2 different backend for JIT and codegen.

This became necessary because there is no way to fixup debug infos in LLVM ATM. This was something needed to be done at some point anyway as CTFE require extra "runtime" checks For instance, pointer are comparable if they are part of the same allocation, not otherwize, meaning the codegen must be different for pointer comparaisons.

The instanciation of the backend and the semantic pass are somewhat improved in the process, but it is clear that the backend needs restructuring.
latest commit 7a4655613c
@deadalnix deadalnix authored


SDC - The Stupid D Compiler

This is the home of a D compiler. SDC is at the moment, particularly stupid; it is a work in progress. Feel free to poke around, but don't expect it to compile your code.

This compiler is based on libd for D code analysis. It uses LLVM and libd-llvm for codegen and JIT CTFE. It uses libsdrt to support various runtime facilities required by programs compiled by SDC.

The code is released under the MIT license (see the LICENCE file for more details). Contact me at

SDC requires DMD release 2.068 to compile.


Right now, SDC is a work in progress and unusable for any production work. Its intent is to provide a D compiler as a library (libd) in order to improve the overall D toolchain by enabling the possibility of developing new tools.

SDC now supports many very advanced features (static ifs, string mixins, CTFE) of D, but not many basic ones. This is a development choice to allow the architecturing of the compiler around the hardest features of the language. As a consequence, SDC has a solid base to build upon.

What Can It Compile?

See the tests directory for a sample of what is/should-be working. phobos/object.d contains the current (temporary) object.d file for SDC.


This just me thinking outloud about what features I want, when.


  • Compile D style (writeln) hello world.


  • Compile itself, which imply compile most of D.


  • Propose a stable API for 3rd party.


  • extern (C++)

Compiling SDC on Linux

You'll need make and the latest DMD installed. Install LLVM 3.6.

Run make.

Then you can compile runner.d with dmd and run it to run the test suites. There should be no regressions. SDC contains a lot of hardcoded PATH right now, so it's hard to integrate properly with the system. It expects object.d to be in ../libs/object.d

SDC requires LLVM 3.6 . If the default llvm-config on your system is an older version, you can specify a newer version via LLVM_CONFIG. For instance, on a debian system, you want to use make LLVM_CONFIG=llvm-config-3.6 .

Compiling SDC on Mac OS X

You'll need make and the latest DMD installed. You'll also need llvm36 if you don't already have it. One way to install llvm that's been tested is to use Homebrew, a package manager for OS X. After installing it by following instructions from the web page, run the command brew install llvm36, followed by make LLVM_CONFIG=llvm-config-3.6 .


Extract the LLVM DLL binary archive to the SDC repository, then build with make -f When running SDC, make sure gcc, llc and opt are available in your PATH.

To run the tests, execute dmd runner.d to build the test-runner application found in tests/, then run it with runner.

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