Next: , Previous: Loop representation, Up: Loop Analysis and Representation

11.2 Loop querying

The functions to query the information about loops are declared in cfgloop.h. Some of the information can be taken directly from the structures. loop_father field of each basic block contains the innermost loop to that the block belongs. The most useful fields of loop structure (that are kept up-to-date at all times) are:

There are other fields in the loop structures, many of them used only by some of the passes, or not updated during CFG changes; in general, they should not be accessed directly.

The most important functions to query loop structures are: