tests/codegen/naked-functions.rs

   1 // compile-flags: -C no-prepopulate-passes -Copt-level=0
   2 // needs-asm-support
   3 // only-x86_64
   4
   5 #![crate_type = "lib"]
   6 #![feature(naked_functions)]
   7 use std::arch::asm;
   8
   9 // CHECK: Function Attrs: naked
  10 // CHECK-NEXT: define{{.*}}void @naked_empty()
  11 #[no_mangle]
  12 #[naked]
  13 pub unsafe extern "C" fn naked_empty() {
  14     // CHECK-NEXT: {{.+}}:
  15     // CHECK-NEXT: call void asm
  16     // CHECK-NEXT: unreachable
  17     asm!("ret",
  18          options(noreturn));
  19 }
  20
  21 // CHECK: Function Attrs: naked
  22 // CHECK-NEXT: define{{.*}}i{{[0-9]+}} @naked_with_args_and_return(i64 %a, i64 %b)
  23 #[no_mangle]
  24 #[naked]
  25 pub unsafe extern "C" fn naked_with_args_and_return(a: isize, b: isize) -> isize {
  26     // CHECK-NEXT: {{.+}}:
  27     // CHECK-NEXT: call void asm
  28     // CHECK-NEXT: unreachable
  29     asm!("lea rax, [rdi + rsi]",
  30          "ret",
  31          options(noreturn));
  32 }