clang/test/CodeGenCXX/castexpr-basepathsize-threshold.cpp

   1 // RUN: %clang_cc1 %s -emit-llvm-only -o -
   2
   3 // https://bugs.llvm.org/show_bug.cgi?id=38356
   4 // We only check that we do not crash.
   5
   6 // This test can exceed stack usage in some configurations, so unless we can
   7 // properly handle that don't run it.
   8 // REQUIRES: thread_support
   9
  10 template <typename a, a b(unsigned), int c, unsigned...>
  11 struct d : d<a, b, c - 1> {};
  12 template <typename a, a b(unsigned), unsigned... e>
  13 struct d<a, b, 0, e...> {
  14   a f[0];
  15 };
  16 struct g {
  17   static g h(unsigned);
  18 };
  19 struct i {
  20   void j() const;
  21   // Current maximum depth of recursive template instantiation is 1024,
  22   // thus, this \/ threshold value is used here. BasePathSize in CastExpr might
  23   // not fit it, so we are testing that we do fit it.
  24   // If -ftemplate-depth= is provided, larger values (4096 and up) cause crashes
  25   // elsewhere.
  26   d<g, g::h, (1U << 10U) - 2U> f;
  27 };
  28 void i::j() const {
  29   const void *k{f.f};
  30   (void)k;
  31 }