generated_module.ll

source_filename = "1tyt6immxwy9a8vn"
target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc"

%.win32.image_import_desc = type { i32, i32, i32, i32, i32 }

@__ImageBase = external global i8

@import.mydll.1.dll.dll_name = private constant [11 x i8] c"mydll.1.dll", section ".idata$7"

@import.mydll.1.dll.fn.add = private constant [6 x i8] c"\00\00add\00", section ".idata$6"

@import.mydll.1.dll.fn.sub = private constant [6 x i8] c"\00\00sub\00", section ".idata$6"

@import.mydll.1.dll.desc = private global [3 x i8*] [
  i8* getelementptr inbounds ([6 x i8], [6 x i8]* @import.mydll.1.dll.fn.add, i32 0, i32 0),
  i8* getelementptr inbounds ([6 x i8], [6 x i8]* @import.mydll.1.dll.fn.sub, i32 0, i32 0),
  i8* null
], section ".idata$4"

@import.mydll.1.dll.ptr = private global [3 x i8*] [
  i8* getelementptr inbounds ([6 x i8], [6 x i8]* @import.mydll.1.dll.fn.add, i32 0, i32 0),
  i8* getelementptr inbounds ([6 x i8], [6 x i8]* @import.mydll.1.dll.fn.sub, i32 0, i32 0),
  i8* null
], section ".idata$3"

@.dllimport = constant [2 x %.win32.image_import_desc] [
  %.win32.image_import_desc { 
    i32 sub (i32 ptrtoint ([3 x i8*]* @import.mydll.1.dll.desc to i32), i32 ptrtoint (i8* @__ImageBase to i32)),
    i32 0,
    i32 0,
    i32 sub (i32 ptrtoint ([11 x i8]* @import.mydll.1.dll.dll_name to i32), i32 ptrtoint (i8* @__ImageBase to i32)),
    i32 sub (i32 ptrtoint ([3 x i8*]* @import.mydll.1.dll.ptr to i32), i32 ptrtoint (i8* @__ImageBase to i32))
  }, 
  %.win32.image_import_desc zeroinitializer
], section ".idata$2"

!llvm.module.flags = !{!0, !1}

!0 = !{i32 7, !"PIC Level", i32 2}
!1 = !{i32 7, !"PIE Level", i32 2}

input.rs

#![feature(raw_dylib)]

mod mydll {
    #[link(kind="raw-dylib", name="mydll.1.dll")]
    extern "C" {
        pub fn add(a: i32, b: i32) -> i32;
        pub fn sub(a: i32, b: i32) -> i32;
    }
}

pub fn call_external_functions(a: i32, b: i32, c: i32) -> i32 {
    unsafe {
        let x = mydll::add(a, b);
        mydll::sub(x, c)
    }
}

fn main() {
    std::process::exit(call_external_functions(3, 4, 5));
}