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

   1 // This ensures that DW_OP_deref is inserted when necessary, such as when NRVO
   2 // of a string object occurs in C++.
   3 //
   4 // RUN: %clangxx -O0 -fno-exceptions %target_itanium_abi_host_triple %s -o %t.out -g
   5 // RUN: %test_debuginfo %s %t.out
   6 // RUN: %clangxx -O1 -fno-exceptions %target_itanium_abi_host_triple %s -o %t.out -g
   7 // RUN: %test_debuginfo %s %t.out
   8 // XFAIL: !system-darwin && gdb-clang-incompatibility
   9 // PR34513
  10 volatile int sideeffect = 0;
  11 void __attribute__((noinline)) stop() { sideeffect++; }
  12
  13 struct string {
  14   string() {}
  15   string(int i) : i(i) {}
  16   ~string() {}
  17   int i = 0;
  18 };
  19 string __attribute__((noinline)) get_string() {
  20   string unused;
  21   string result = 3;
  22   // DEBUGGER: break 23
  23   stop();
  24   return result;
  25 }
  26 void some_function(int) {}
  27 struct string2 {
  28   string2() = default;
  29   string2(string2 &&other) { i = other.i; }
  30   int i;
  31 };
  32 string2 __attribute__((noinline)) get_string2() {
  33   string2 result;
  34   result.i = 5;
  35   some_function(result.i);
  36   // Test that the debugger can get the value of result after another
  37   // function is called.
  38   // DEBUGGER: break 39
  39   stop();
  40   return result;
  41 }
  42 int main() {
  43   get_string();
  44   get_string2();
  45 }
  46
  47 // DEBUGGER: r
  48 // DEBUGGER: print result.i
  49 // CHECK:  = 3
  50 // DEBUGGER: c
  51 // DEBUGGER: print result.i
  52 // CHECK:  = 5