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llvm-project/clang/test/CodeGenCXX/return.cpp

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At -O0, emit an @llvm.trap() call at the end of a value-returning function which fails to return a value, to make debugging this issue easier. llvm-svn: 165914
2012-10-15 08:23:07 +08:00
// RUN: %clang_cc1 -emit-llvm -O0 -o - %s | FileCheck %s
// RUN: %clang_cc1 -emit-llvm -O -o - %s | FileCheck %s --check-prefix=CHECK-OPT
If we flow off the end of a value-returning function: - outside C++, return undef (behavior is not undefined unless the value is used) - in C++, with -fcatch-undefined-behavior, perform an appropriate trap - in C++, produce an 'unreachable' (behavior is undefined immediately) llvm-svn: 165273
2012-10-05 07:52:29 +08:00
At -O0, emit an @llvm.trap() call at the end of a value-returning function which fails to return a value, to make debugging this issue easier. llvm-svn: 165914
2012-10-15 08:23:07 +08:00
// CHECK: @_Z9no_return
// CHECK-OPT: @_Z9no_return
If we flow off the end of a value-returning function: - outside C++, return undef (behavior is not undefined unless the value is used) - in C++, with -fcatch-undefined-behavior, perform an appropriate trap - in C++, produce an 'unreachable' (behavior is undefined immediately) llvm-svn: 165273
2012-10-05 07:52:29 +08:00
int no_return() {
At -O0, emit an @llvm.trap() call at the end of a value-returning function which fails to return a value, to make debugging this issue easier. llvm-svn: 165914
2012-10-15 08:23:07 +08:00
// CHECK: call void @llvm.trap
// CHECK-NEXT: unreachable
// CHECK-OPT-NOT: call void @llvm.trap
// CHECK-OPT: unreachable
If we flow off the end of a value-returning function: - outside C++, return undef (behavior is not undefined unless the value is used) - in C++, with -fcatch-undefined-behavior, perform an appropriate trap - in C++, produce an 'unreachable' (behavior is undefined immediately) llvm-svn: 165273
2012-10-05 07:52:29 +08:00
}