mark_byte_addr    214 gc/include/private/gc_pmark.h         register VOLATILE char * mark_byte_addr = \
mark_byte_addr    216 gc/include/private/gc_pmark.h         register char mark_byte = *mark_byte_addr; \
mark_byte_addr    219 gc/include/private/gc_pmark.h 	*mark_byte_addr = 1;  \