diff options
Diffstat (limited to 'clang/test/CodeGenCXX/stack-reuse-miscompile.cpp')
| -rw-r--r-- | clang/test/CodeGenCXX/stack-reuse-miscompile.cpp | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/clang/test/CodeGenCXX/stack-reuse-miscompile.cpp b/clang/test/CodeGenCXX/stack-reuse-miscompile.cpp index 3b860a57395..4e824d94f51 100644 --- a/clang/test/CodeGenCXX/stack-reuse-miscompile.cpp +++ b/clang/test/CodeGenCXX/stack-reuse-miscompile.cpp @@ -1,8 +1,4 @@ -// RUN: %clang_cc1 -triple armv7l-unknown-linux-gnueabihf -emit-llvm -O1 -disable-llvm-passes -std=c++03 %s -o - | FileCheck %s - -// This test should not to generate llvm.lifetime.start/llvm.lifetime.end for -// f function because all temporary objects in this function are used for the -// final result +// 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 class S { char *ptr; @@ -23,14 +19,36 @@ public: const char * f(S s) { +// It's essential that the lifetimes of all three T temporaries here are +// overlapping. They must all remain alive through the call to str(). +// // CHECK: [[T1:%.*]] = alloca %class.T, align 4 // CHECK: [[T2:%.*]] = alloca %class.T, align 4 // CHECK: [[T3:%.*]] = alloca %class.T, align 4 -// CHECK: [[T4:%.*]] = call %class.T* @_ZN1TC1EPKc(%class.T* [[T1]], i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0)) -// CHECK: [[T5:%.*]] = call %class.T* @_ZN1TC1E1S(%class.T* [[T2]], [2 x i32] %{{.*}}) -// CHECK: call void @_ZNK1T6concatERKS_(%class.T* sret [[T3]], %class.T* [[T1]], %class.T* dereferenceable(16) [[T2]]) -// CHECK: [[T6:%.*]] = call i8* @_ZNK1T3strEv(%class.T* [[T3]]) +// +// FIXME: We could defer starting the lifetime of the return object of concat +// until the call. +// CHECK: [[T1i8:%.*]] = bitcast %class.T* [[T1]] to i8* +// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T1i8]]) +// +// CHECK: [[T2i8:%.*]] = bitcast %class.T* [[T2]] to i8* +// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T2i8]]) +// CHECK: [[T4:%.*]] = call %class.T* @_ZN1TC1EPKc(%class.T* [[T2]], i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0)) +// +// CHECK: [[T3i8:%.*]] = bitcast %class.T* [[T3]] to i8* +// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T3i8]]) +// CHECK: [[T5:%.*]] = call %class.T* @_ZN1TC1E1S(%class.T* [[T3]], [2 x i32] %{{.*}}) +// +// CHECK: call void @_ZNK1T6concatERKS_(%class.T* sret [[T1]], %class.T* [[T2]], %class.T* dereferenceable(16) [[T3]]) +// CHECK: [[T6:%.*]] = call i8* @_ZNK1T3strEv(%class.T* [[T1]]) +// +// CHECK: call void @llvm.lifetime.end.p0i8( +// CHECK: call void @llvm.lifetime.end.p0i8( +// CHECK: call void @llvm.lifetime.end.p0i8( // CHECK: ret i8* [[T6]] return T("[").concat(T(s)).str(); } + +// CHECK: declare {{.*}}llvm.lifetime.start +// CHECK: declare {{.*}}llvm.lifetime.end |
