llvm-project/debuginfo-tests/llgdb-tests/nrvo-string.cpp

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// This ensures that DW_OP_deref is inserted when necessary, such as when NRVO
// of a string object occurs in C++.
//
// RUN: %clangxx -O0 -fno-exceptions %target_itanium_abi_host_triple %s -o %t.out -g
// RUN: %test_debuginfo %s %t.out
// RUN: %clangxx -O1 -fno-exceptions %target_itanium_abi_host_triple %s -o %t.out -g
// RUN: %test_debuginfo %s %t.out
//
// PR34513
volatile int sideeffect = 0;
void __attribute__((noinline)) stop() { sideeffect++; }
struct string {
string() {}
string(int i) : i(i) {}
~string() {}
int i = 0;
};
string __attribute__((noinline)) get_string() {
string unused;
string result = 3;
// DEBUGGER: break 23
stop();
return result;
}
void some_function(int) {}
struct string2 {
string2() = default;
string2(string2 &&other) { i = other.i; }
int i;
};
string2 __attribute__((noinline)) get_string2() {
string2 result;
result.i = 5;
some_function(result.i);
// Test that the debugger can get the value of result after another
// function is called.
// DEBUGGER: break 39
stop();
return result;
}
int main() {
get_string();
get_string2();
}
// DEBUGGER: r
// DEBUGGER: print result.i
// CHECK: = 3
// DEBUGGER: c
// DEBUGGER: print result.i
// CHECK: = 5