Mercurial > hg > CbC > CbC_llvm

comparison clang/test/CodeGenCXX/stack-reuse-miscompile.cpp @ 150:1d019706d866

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
parents
children 0572611fdcc8
comparison
equal deleted inserted replaced
147:c2174574ed3a 150:1d019706d866
1 // RUN: %clang_cc1 -triple armv7l-unknown-linux-gnueabihf -emit-llvm -O1 -disable-llvm-passes -std=c++03 %s -o - | FileCheck %s --implicit-check-not=llvm.lifetime
2
3 class S {
4 char *ptr;
5 unsigned int len;
6 };
7
8 class T {
9 S left;
10 S right;
11
12 public:
13 T(const char s[]);
14 T(S);
15
16 T concat(const T &Suffix) const;
17 const char * str() const;
18 };
19
20 const char * f(S s)
21 {
22 // It's essential that the lifetimes of all three T temporaries here are
23 // overlapping. They must all remain alive through the call to str().
24 //
25 // CHECK: [[T1:%.*]] = alloca %class.T, align 4
26 // CHECK: [[T2:%.*]] = alloca %class.T, align 4
27 // CHECK: [[T3:%.*]] = alloca %class.T, align 4
28 //
29 // FIXME: We could defer starting the lifetime of the return object of concat
30 // until the call.
31 // CHECK: [[T1i8:%.*]] = bitcast %class.T* [[T1]] to i8*
32 // CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T1i8]])
33 //
34 // CHECK: [[T2i8:%.*]] = bitcast %class.T* [[T2]] to i8*
35 // CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T2i8]])
36 // CHECK: [[T4:%.*]] = call %class.T* @_ZN1TC1EPKc(%class.T* [[T2]], i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0))
37 //
38 // CHECK: [[T3i8:%.*]] = bitcast %class.T* [[T3]] to i8*
39 // CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T3i8]])
40 // CHECK: [[T5:%.*]] = call %class.T* @_ZN1TC1E1S(%class.T* [[T3]], [2 x i32] %{{.*}})
41 //
42 // CHECK: call void @_ZNK1T6concatERKS_(%class.T* sret [[T1]], %class.T* [[T2]], %class.T* dereferenceable(16) [[T3]])
43 // CHECK: [[T6:%.*]] = call i8* @_ZNK1T3strEv(%class.T* [[T1]])
44 //
45 // CHECK: call void @llvm.lifetime.end.p0i8(
46 // CHECK: call void @llvm.lifetime.end.p0i8(
47 // CHECK: call void @llvm.lifetime.end.p0i8(
48 // CHECK: ret i8* [[T6]]
49
50 return T("[").concat(T(s)).str();
51 }
52
53 // CHECK: declare {{.*}}llvm.lifetime.start
54 // CHECK: declare {{.*}}llvm.lifetime.end