nrvo.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++.
//
// REQUIRES: system-windows
//
// RUN: %dexter --fail-lt 1.0 -w --builder 'clang-cl_vs2015' \
// RUN: --debugger 'dbgeng' --cflags '/Z7 /Zi' --ldflags '/Z7 /Zi' -- %s
struct string {
string() {}
string(int i) : i(i) {}
~string() {}
int i = 0;
};
string get_string() {
string unused;
string result = 3;
return result; // DexLabel('readresult1')
}
void some_function(int) {}
struct string2 {
string2() = default;
string2(string2 &&other) { i = other.i; }
int i;
};
string2 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.
return result; // DexLabel('readresult2')
}
int main() {
get_string();
get_string2();
}
// DexExpectWatchValue('result.i', 3, on_line='readresult1')
// DexExpectWatchValue('result.i', 5, on_line='readresult2')