Search notes:

vim - src/vim.h

The VV_* #defines identify v: (vim) variables.

DOSO_*

THe DOSO_* macros are used in do_source(): 
#define DOSO_NONE	0
#define DOSO_VIMRC	1	// loading vimrc file
#define DOSO_GVIMRC	2	// loading gvimrc file

See also

The auto_event enum that defines a number for each event.
flags for setting options

Links

https://github.com/vim/vim/blob/master/src/vim.h

Index