hello.slate

pub const main = func() {
    print("Hello, world!\n",)
}

const print = func(s: string) {
    # 1 is the file descriptor for std out
    write(1, s,)
}

const write = func(fd: int, s: string) {
    # 1 is the ID for the write syscall
    syscall3(1, fd, s.ptr, s.len,)
}

const syscall3 = func(call: int, arg1: int, arg2: int, arg3: int) {
    # this function only works on x86_64
    asm "syscall", "=r,{rax},{rdi},{rsi},{rdx}", call, arg1, arg2, arg3
}

test.ll

@0 = global [15 x i8] c"Hello, world!\0A\00"
@1 = global { i8*, i64 } { i8* getelementptr inbounds ([15 x i8], [15 x i8]* @0, i32 0, i32 0), i64 15 }

define void @2(i64 %0, i64 %1, i64 %2, i64 %3) {
4:
	%5 = call i64 asm sideeffect "syscall", "=r,{rax},{rdi},{rsi},{rdx}"(i64 %0, i64 %1, i64 %2, i64 %3)
	ret void
}

define void @3(i64 %0, { i8*, i64 }* %1) {
2:
	%3 = getelementptr inbounds { i8*, i64 }, { i8*, i64 }* %1, i32 0, i32 0
	%4 = load i8*, i8** %3
	%5 = ptrtoint i8* %4 to i64
	%6 = getelementptr inbounds { i8*, i64 }, { i8*, i64 }* %1, i32 0, i32 1
	%7 = load i64, i64* %6
	call void @2(i64 1, i64 %0, i64 %5, i64 %7)
	ret void
}

define void @4({ i8*, i64 }* %0) {
1:
	call void @3(i64 1, { i8*, i64 }* %0)
	ret void
}

define i32 @main() {
0:
	call void @4({ i8*, i64 }* @1)
	ret i32 0
}