This information is mainly interesting if external data must be added to the WPO feedback file, e.g. from a profiling tool. For regular use of the WPO feature, the following information is not needed and can be ignored.
The file consists of comments and a number of sections. Comments are lines that start with a #. Each section starts with ”% ” followed by the name of the section (e.g.,% contextinsensitive_devirtualization).
After that, until either the end of the file or until the next line starting with with ”% ”, first a human readable description follows of the format of this section (in comments), and then the contents of the section itself.
There are no rules for how the contents of a section should look, except that lines starting with # are reserved for comments and lines starting with % are reserved for section markers.