src/test/codegen/naked-functions.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // ignore-tidy-linelength
  12
  13 // compile-flags: -C no-prepopulate-passes
  14
  15 #![crate_type = "lib"]
  16 #![feature(naked_functions)]
  17
  18 // CHECK: Function Attrs: naked uwtable
  19 // CHECK-NEXT: define void @naked_empty()
  20 #[no_mangle]
  21 #[naked]
  22 pub fn naked_empty() {
  23     // CHECK-NEXT: {{.+}}:
  24     // CHECK-NEXT: ret void
  25 }
  26
  27 // CHECK: Function Attrs: naked uwtable
  28 #[no_mangle]
  29 #[naked]
  30 // CHECK-NEXT: define void @naked_with_args(i{{[0-9]+}})
  31 pub fn naked_with_args(a: isize) {
  32     // CHECK-NEXT: {{.+}}:
  33     // CHECK-NEXT: %a = alloca i{{[0-9]+}}
  34     &a; // keep variable in an alloca
  35     // CHECK: ret void
  36 }
  37
  38 // CHECK: Function Attrs: naked uwtable
  39 // CHECK-NEXT: define i{{[0-9]+}} @naked_with_return()
  40 #[no_mangle]
  41 #[naked]
  42 pub fn naked_with_return() -> isize {
  43     // CHECK-NEXT: {{.+}}:
  44     // CHECK-NEXT: ret i{{[0-9]+}} 0
  45     0
  46 }
  47
  48 // CHECK: Function Attrs: naked uwtable
  49 // CHECK-NEXT: define i{{[0-9]+}} @naked_with_args_and_return(i{{[0-9]+}})
  50 #[no_mangle]
  51 #[naked]
  52 pub fn naked_with_args_and_return(a: isize) -> isize {
  53     // CHECK-NEXT: {{.+}}:
  54     // CHECK-NEXT: %a = alloca i{{[0-9]+}}
  55     &a; // keep variable in an alloca
  56     // CHECK: ret i{{[0-9]+}} %{{[0-9]+}}
  57     a
  58 }
  59
  60 // CHECK: Function Attrs: naked uwtable
  61 // CHECK-NEXT: define void @naked_recursive()
  62 #[no_mangle]
  63 #[naked]
  64 pub fn naked_recursive() {
  65     // CHECK-NEXT: {{.+}}:
  66     // CHECK-NEXT: call void @naked_empty()
  67
  68     // FIXME(#39685) Avoid one block per call.
  69     // CHECK-NEXT: br label %bb1
  70     // CHECK: bb1:
  71
  72     naked_empty();
  73
  74     // CHECK-NEXT: %{{[0-9]+}} = call i{{[0-9]+}} @naked_with_return()
  75
  76     // FIXME(#39685) Avoid one block per call.
  77     // CHECK-NEXT: br label %bb2
  78     // CHECK: bb2:
  79
  80     // CHECK-NEXT: %{{[0-9]+}} = call i{{[0-9]+}} @naked_with_args_and_return(i{{[0-9]+}} %{{[0-9]+}})
  81
  82     // FIXME(#39685) Avoid one block per call.
  83     // CHECK-NEXT: br label %bb3
  84     // CHECK: bb3:
  85
  86     // CHECK-NEXT: call void @naked_with_args(i{{[0-9]+}} %{{[0-9]+}})
  87
  88     // FIXME(#39685) Avoid one block per call.
  89     // CHECK-NEXT: br label %bb4
  90     // CHECK: bb4:
  91
  92     naked_with_args(
  93         naked_with_args_and_return(
  94             naked_with_return()
  95         )
  96     );
  97     // CHECK-NEXT: ret void
  98 }