* Serene lang
 Build Status: [[https://drone.devheroes.codes/api/badges/Serene/Serene/status.svg]]

** Setup development environment
Setup the githook and install dependencies using the following commands:

 #+BEGIN_SRC bash
 ./builder setup
 #+END_SRC

*** Dependencies
    You would need the following dependencies to start get started with *Serene* development

    - LLVM (LLVM Instructions coming up.)
    - cmake
    - ninja
    - doxygen (If you want to build the docs as well)
    - Valgrind
    - CCache (If you want faster builds specially with the LLVM)
    - Boehm GC v8.2.0 (has to be built statically and with ~-fPIC~)

** LLVM Installation

  *Important Note*: We're trying to keep Serene up to date with the LLVM release cycle till we get
  to our first release. So we use the development version of the LLVM. Currently we are using
  =7240436c94bd02762a723a2e3551528d16c8efdb= commit as our reference.

  MLIR is a part of the [[https://llvm.org][LLVM]] project and in order to build it we need to build the LLVM itself as well.
  Here is a quick guide to build the latest version of the LLVM and MLIR.

  #+BEGIN_SRC bash
    ## YES we're using the development version of MLIR
    git clone https://github.com/llvm/llvm-project.git

    mkdir llvm-project/build
    cd llvm-project/build

    cmake -G Ninja ../llvm \
          -DCMAKE_INSTALL_PREFIX=/your/target/path \
          -DLLVM_PARALLEL_COMPILE_JOBS=7 \
          -DLLVM_PARALLEL_LINK_JOBS=1 \
          -DLLVM_BUILD_EXAMPLES=ON \
          -DLLVM_TARGETS_TO_BUILD="X86" \
          -DCMAKE_BUILD_TYPE=Release \
          -DLLVM_EXTERNAL_PROJECTS=iwyu \ # Only if you want to enable the 'Include what you use' tool
          -DLLVM_EXTERNAL_IWYU_SOURCE_DIR=/path/to/iwyu \
          -DLLVM_ENABLE_ASSERTIONS=ON \
          -DLLVM_CCACHE_BUILD=ON \
          -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
          -DLLVM_ENABLE_PROJECTS='clang;lldb;lld;mlir;clang-tools-extra;compiler-rt;libcxx;libcxxabi;libunwind' \
          -DCMAKE_C_COMPILER=clang \       # If you have clang installed already
          -DCMAKE_CXX_COMPILER=clang++ \   # If you have clang installed already
          -DLLVM_ENABLE_LLD=ON

    cmake --build .

    cmake --build . --target check-mlir

    cmake -DCMAKE_INSTALL_PREFIX=/your/target/location -P cmake_install.cmake
  #+END_SRC

  You need to have =clang= and =lld= installed to compile the LLVM with the above command. Also if you
  are not using =ccache= just remove the option related to it from the above command.

*** Emacs
    If you're using Emacs as your development environment just install =clangd= and =lsp=.

** Heads up for devs
While you're working on *Serene* be mindful of:
- In =DEBUG= mode we dynamically link against =libsan= due to the fact that we build the =libserene=
  as a shared lib by default. This means we need to =LD_PRELOAD= the =libclang_rt= before we run
  any executable. If you're using the =builder= script you're all set otherwise you can run an
  executable like:

  #+BEGIN_SRC bash
    LD_PRELOAD=$(clang -print-file-name=libclang_rt.asan-x86_64.so) /path/to/executable
  #+END_SRC

** Build the devtools
We have our own version of `mlir-opt` which is `slir-opt` and also we have an LSP server for SLIR too.
Both are in the ~devtools~ directory and in order to build them all you need to do is to use
~-DSERENE_ENABLE_DEVTOOLS=ON~ parameter with cmake for example ~./builder build -DSERENE_ENABLE_DEVTOOLS=ON~
will do the job for you.

* How to build
In order to build for development (Debug mode) just use =./builder build= to setup the build and build
the project once and then you can just use =./builder compile= to build the changed files only.

Check out the =builder= script for more subcommands and details.

* How to Debug
Since we're using the Boehm GC, in order to use a debugger we need to turn off some of the signal
handlers that the debugger sets. In order to run the debugger (by default lldb) with ~serenec~
just use the ~lldb-run~ subcommand of the builder script. In the debugger, after setting the
break point on the ~main~ function (~b main~) then use the following commands on:

  #+BEGIN_SRC bash
   process handle -p yes -s no -n no SIGPWR
   process handle -p yes -s no -n no SIGXCPU
   process handle -p yes -s no -n no SIGSEGV
  #+END_SRC bash


* Cheatsheets
  - [[https://github.com/muqsitnawaz/modern-cpp-cheatsheet][Modern C++ Cheatsheet]]

* License
Copyright (c) 2019-2022 Sameer Rahmani <lxsameer@gnu.org>

*Serene* is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 2.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

* Get Help
  If you need help or you just want to hangout, you can find us at:

  - *IRC*: *#serene-lang* on the libera chat server
  - *MailingList*: https://www.freelists.org/list/serene