tests/intrusive_shared_ptr_src/abi.caller.smart.cpp

   1 //
   2 // This tests that we can call functions implemented using raw pointers from
   3 // an API vending itself as returning shared pointers, because both are ABI
   4 // compatible.
   5 //
   6 // In this TU, SharedPtr<T> is intrusive_shared_ptr<T>, since USE_SHARED_PTR
   7 // is defined.
   8 //
   9
  10 #define USE_SHARED_PTR
  11
  12 #include <libkern/c++/intrusive_shared_ptr.h>
  13 #include <darwintest.h>
  14 #include "abi_helper.h"
  15
  16 static_assert(sizeof(SharedPtr<T>) == sizeof(T*));
  17 static_assert(alignof(SharedPtr<T>) == alignof(T*));
  18
  19 // Receive a shared pointer from a function that actually returns a raw pointer
  20 T_DECL(abi_caller_smart, "intrusive_shared_ptr.abi.caller.smart") {
  21         T obj{3};
  22         T* expected = &obj;
  23         SharedPtr<T> result = return_raw_as_shared(expected);
  24         CHECK(result.get() == expected);
  25
  26         // Sometimes the test above passes even though it should fail, if the
  27         // right address happens to be on the stack in the right location. This
  28         // can happen if abi.caller.raw is run just before this test. This second
  29         // test makes sure it fails when it should.
  30         CHECK(result->i == 3);
  31 }