- loading and unloading of user-provided plugins
- invocation of user-provided parameter- and result-less callback functions at selected locations in compiler code, with read/write access to selected elements of compiler state
- access to compiler version information
- access to the list of compiler passes, flags and parameters
- reordering of compiler passes
- read/write access to compiler flags and parameters

ici_load, ici_unload,
ici_register_event, ici_call_event,
ici_init_features, ici_get_feature,
ici_get_feature_size, ici_get_subfeature,
ici_register_parameter, ici_unregister_parameter,ici_get_parameter

- function cloning and specialization

- linking with external libraries
- add call to external function at the beginning of the program
- add call to external function at the program exit
- add -OML flag to select plugin with machine learning optimization heuristic

- get compiled filename with full path at the beginning of each function
- get start line/stop line for the compiled function in this file
- get language name for the compiled program (f77, c, cpp)