It is possible to increase the messages produced by the virtual machine while in the native code editing the file Native/share/log.h and changing the macro value
#define log_ALL 0 // log disabled
to a true value
#define log_ALL 1 // log enable
to a true value
#define log_ALL 1 // log enable
The article Maxine: increasing the machine debug messages has been posted by Luca Ferrari on August 30, 2010