src/test/codegen/lifetime_start_end.rs

   1 // Copyright 2016 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 // compile-flags: -O -C no-prepopulate-passes
  12
  13 #![crate_type = "lib"]
  14 #![feature(rustc_attrs)]
  15
  16 // CHECK-LABEL: @test
  17 #[no_mangle]
  18 #[rustc_mir] // FIXME #27840 MIR has different codegen.
  19 pub fn test() {
  20     let a = 0;
  21     &a; // keep variable in an alloca
  22
  23 // CHECK: [[S_a:%[0-9]+]] = bitcast i32* %a to i8*
  24 // CHECK: call void @llvm.lifetime.start(i{{[0-9 ]+}}, i8* [[S_a]])
  25
  26     {
  27         let b = &Some(a);
  28         &b; // keep variable in an alloca
  29
  30 // CHECK: [[S_b:%[0-9]+]] = bitcast %"core::option::Option<i32>"** %b to i8*
  31 // CHECK: call void @llvm.lifetime.start(i{{[0-9 ]+}}, i8* [[S_b]])
  32
  33 // CHECK: [[S__5:%[0-9]+]] = bitcast %"core::option::Option<i32>"* %_5 to i8*
  34 // CHECK: call void @llvm.lifetime.start(i{{[0-9 ]+}}, i8* [[S__5]])
  35
  36 // CHECK: [[E__5:%[0-9]+]] = bitcast %"core::option::Option<i32>"* %_5 to i8*
  37 // CHECK: call void @llvm.lifetime.end(i{{[0-9 ]+}}, i8* [[E__5]])
  38
  39 // CHECK: [[E_b:%[0-9]+]] = bitcast %"core::option::Option<i32>"** %b to i8*
  40 // CHECK: call void @llvm.lifetime.end(i{{[0-9 ]+}}, i8* [[E_b]])
  41     }
  42
  43     let c = 1;
  44     &c; // keep variable in an alloca
  45
  46 // CHECK: [[S_c:%[0-9]+]] = bitcast i32* %c to i8*
  47 // CHECK: call void @llvm.lifetime.start(i{{[0-9 ]+}}, i8* [[S_c]])
  48
  49 // CHECK: [[E_c:%[0-9]+]] = bitcast i32* %c to i8*
  50 // CHECK: call void @llvm.lifetime.end(i{{[0-9 ]+}}, i8* [[E_c]])
  51
  52 // CHECK: [[E_a:%[0-9]+]] = bitcast i32* %a to i8*
  53 // CHECK: call void @llvm.lifetime.end(i{{[0-9 ]+}}, i8* [[E_a]])
  54 }