In the compiler build options, under the LLVM build options, the compiler can output LLVM bitcode by doing:
llvm_options.output_bitcode = true;
By default, the bitcode is outputted to the .build folder. However, one can change where the bitcode is outputted by changing the intermediate path of the compiler:
target_options.intermediate_path = #filepath;
By setting the intermediate path to whatever you want, you can change where the bitcode files end up at.
Here is a simple compiler message loop example of how to generate LLVM bitcode:
#import "Basic";
#import "Compiler";
#run {
w := compiler_create_workspace("workspace_1");
if !w {
print("Workspace creation failed.\n");
return;
}
target_options := get_build_options(w);
target_options.output_executable_name = "executable";
target_options.intermediate_path = #filepath;
set_optimization_level(*target_options, 2, 0);
target_options.llvm_options.output_bitcode = true;
set_build_options(target_options, w);
compiler_begin_intercept(w);
add_build_file("main.jai", w);
while true {
message := compiler_wait_for_message();
if !message break;
if message.kind == {
case .COMPLETE;
break;
}
}
compiler_end_intercept(w);
set_build_options_dc(.{do_output=false});
}
Create a simple main.jai program that prints “Hello World!”. Now your build script can generate LLVM bitcode.
#import "Basic";
main :: () {
print("Hello World\n");
}
Generating Assembly Language from LLVM
To install LLVM on your Linux Ubuntu machine, you can use the following Linux commands:
sudo apt install llvm
If you have LLVM installed on your Linux Ubuntu machine, you can use the commands:
llc < your_bitcode.bc > output.asm
as output.asm
to transform the program into assembly language. The llc command transforms your bitcode into the assembly language on your machine, and the as command compiles that assembly language into binary machine language.