Function debug_cpp_alloc

BeefRT/gperftools/src/debugallocation.cc:1106–1152

This is mostly the same a cpp_alloc in tcmalloc.cc. TODO(csilvers): change Allocate() above to call cpp_alloc, so we don't have to reproduce the logic here. To make tc_new_mode work properly, I think we'll need to separate out the logic of throwing from the logic of calling the new-handler.

// properly, I think we'll need to separate out the logic of throwing
// from the logic of calling the new-handler.
inline void* debug_cpp_alloc(size_t size, int new_type, bool nothrow) {
  for (;;) {
    void* p = DebugAllocate(size, new_type);
#ifdef PREANSINEW
    return p;
#else
    if (p == NULL) {  // allocation failed
      // Get the current new handler.  NB: this function is not
      // thread-safe.  We make a feeble stab at making it so here, but
      // this lock only protects against tcmalloc interfering with
      // itself, not with other libraries calling set_new_handler.
      std::new_handler nh;
      {
        SpinLockHolder h(&set_new_handler_lock);
        nh = std::set_new_handler(0);
        (void) std::set_new_handler(nh);
      }
#if (defined(__GNUC__) && !defined(__EXCEPTIONS)) || (defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS)
      if (nh) {
        // Since exceptions are disabled, we don't really know if new_handler
        // failed.  Assume it will abort if it fails.
        (*nh)();
        continue;
      }
      return 0;
#else
      // If no new_handler is established, the allocation failed.
      if (!nh) {
        if (nothrow) return 0;
        throw std::bad_alloc();
      }
      // Otherwise, try the new_handler.  If it returns, retry the
      // allocation.  If it throws std::bad_alloc, fail the allocation.
      // if it throws something else, don't interfere.
      try {
        (*nh)();
      } catch (const std::bad_alloc&) {
        if (!nothrow) throw;
        return p;
      }
#endif  // (defined(__GNUC__) && !defined(__EXCEPTIONS)) || (defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS)
    } else {  // allocation success
      return p;
    }
#endif  // PREANSINEW
  }
}

inline void* do_debug_malloc_or_debug_cpp_alloc(size_t size) {
  return tc_new_mode ? debug_cpp_alloc(size, MallocBlock::kMallocType, true)