Compiler
This is the main nu+ compiler documentation page
Contents
How to compile the Nu+ LLVM
To build the nu+ compiler, you must launch ./setup_new.sh -n from a terminal in the compiler root folder. The script will create a new directory called build and will start building the compiler. By default the script tries to build the compiler using 4 threads. If you want to modify that, especially if your machine have less than 8GB of RAM, you can use the -t flag to specify the number of threads to use. Other information can be obtained by using the -h flag.
How to compile a kernel for the NuPlus architecture
Some kernels are provided with the standard release of the NuPlus toolchain. We provide makefile to compile these kernels for NuPlus. In case you want to add a new kernel, it is suggested to copy a kernel folder and replace C/CPP files with your own source code. Then, remember to modify the makefile updating the SRCS variable with the current main C/CPP filename. When using these makefiles, different tools are called:
- Clang to emit the LLVM IR and the object files
- LLD/MCLINKER to handle the job of linking
- elf2hex to generate the HEX file from the ELF file
- llvm-objdump to generate the dump from the elf file
In order to change the optimization level of the compiler or any other flag, it is possible to modify the /misc/NuPlus.mk file.
How to compile the libraries for the NuPlus architecture
To compile the libraries you only have to execute ./setup_new.sh -l from a terminal in the NuPlusLLVM root folder. The script will automatically build the libraries. Note that you must have compiled the NuPlus compiler first.
Backend for a custom target architecture
Adding a new target architecture, i.e. nu+, to llvm requires four steps:
- write all backend files and place them into the lib/Target/NuPlus folder
- modify the Clang frontend
- register and add the new backend to llvm
- modify and/or add all the external tools that are used by llvm, i.e. linker, disassembler, etc..
