1// Purpose:
2// This ensures that DW_OP_deref is inserted when necessary, such as when
3// NRVO of a string object occurs in C++.
4//
5// REQUIRES: !asan, compiler-rt, lldb
6// UNSUPPORTED: system-windows
7// Zorg configures the ASAN stage2 bots to not build the asan
8// compiler-rt. Only run this test on non-asanified configurations.
9//
10// RUN: %clang++ -std=gnu++11 -O0 -glldb -fno-exceptions %s -o %t
11// RUN: %dexter --fail-lt 1.0 -w \
12// RUN: --binary %t --debugger 'lldb' -- %s
13//
14// RUN: %clang++ -std=gnu++11 -O1 -glldb -fno-exceptions %s -o %t
15// RUN: %dexter --fail-lt 1.0 -w \
16// RUN: --binary %t --debugger 'lldb' -- %s
17//
18// PR34513
19volatile int sideeffect = 0;
20void __attribute__((noinline)) stop() { sideeffect++; }
21
22struct string {
23 string() {}
24 string(int i) : i(i) {}
25 ~string() {}
26 int i = 0;
27};
28string __attribute__((noinline)) get_string() {
29 string unused;
30 string output = 3;
31 stop(); // DexLabel('string-nrvo')
32 return output;
33}
34void some_function(int) {}
35struct string2 {
36 string2() = default;
37 string2(string2 &&other) { i = other.i; }
38 int i;
39};
40string2 __attribute__((noinline)) get_string2() {
41 string2 output;
42 output.i = 5;
43 some_function(output.i);
44 // Test that the debugger can get the value of output after another
45 // function is called.
46 stop(); // DexLabel('string2-nrvo')
47 return output;
48}
49int main() {
50 get_string();
51 get_string2();
52}
53
54// DexExpectWatchValue('output.i', 3, on_line=ref('string-nrvo'))
55// DexExpectWatchValue('output.i', 5, on_line=ref('string2-nrvo'))
56
57

source code of cross-project-tests/debuginfo-tests/dexter-tests/nrvo-string.cpp