Reapply "Import Dexter to debuginfo-tests""

This reverts commit cb935f345683194e42e6e883d79c5a16479acd74.

Discussion in D68708 advises that green dragon is being briskly
refurbished, and it's good to have this patch up testing it.

1 files changed, 52 insertions, 0 deletions

diff --git a/debuginfo-tests/llgdb-tests/nrvo-string.cpp b/debuginfo-tests/llgdb-tests/nrvo-string.cpp
new file mode 100644
index 000000000000..ba8d9d42f6f4
--- /dev/null
+++ b/debuginfo-tests/llgdb-tests/nrvo-string.cpp
@@ -0,0 +1,52 @@
+// 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 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 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