Sonarcloud issues the following warning about various macros in src/hotspot/share/memory/metaspace.

“Move this #define/#undef to the global namespace.
Macros should not be #define'd or #undef'd within a block”

For example, in src/hotspot/share/memory/metaspace/blockTree.cpp

namespace metaspace {
// Needed to prevent linker errors on MacOS and AIX
const size_t BlockTree::MinWordSize;
#define NODE_FORMAT \
Move this #define/#undef to the global namespace.
  "@" PTR_FORMAT \
  ": canary " INTPTR_FORMAT \
  ", parent " PTR_FORMAT \
  ", left " PTR_FORMAT \
  ", right " PTR_FORMAT \
  ", next " PTR_FORMAT \
  ", size " SIZE_FORMAT
#define NODE_FORMAT_ARGS(n) \
  p2i(n), \
  (n)->_canary, \
  p2i((n)->_parent), \
  p2i((n)->_left), \
  p2i((n)->_right), \
  p2i((n)->_next), \
  (n)->_word_size
…

}

Macros should be defined outside of the metaspace namespace, since their scope is not actually restricted.