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

   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
  19 volatile int sideeffect = 0;
  20 void __attribute__((noinline)) stop() { sideeffect++; }
  21
  22 struct string {
  23   string() {}
  24   string(int i) : i(i) {}
  25   ~string() {}
  26   int i = 0;
  27 };
  28 string __attribute__((noinline)) get_string() {
  29   string unused;
  30   string output = 3;
  31   stop(); // DexLabel('string-nrvo')
  32   return output;
  33 }
  34 void some_function(int) {}
  35 struct string2 {
  36   string2() = default;
  37   string2(string2 &&other) { i = other.i; }
  38   int i;
  39 };
  40 string2 __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 }
  49 int 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