This repo contains a version of clang that is modified to support Checked C. Checked C is an extension to C that lets programmers write C code with bounds checking and improved type-safety.
The bounds widening for pointers to null-terminated arrays relies on flow-sensitive bounds declarations for widening bounds using strlen. Currently the bounds widening is unsound because the flow-sensitive bounds declarations are not checked or used. We should implement flow-sensitive bounds checking. The implementation can be done in 4 stages:
Compute the extent of bounds declarations: #1208
Check bounds declarations in _Where clauses: #1209
Use the flow-sensitive bounds declarations for bounds-checking memory accesses: #1210.
Check flow-sensitive bounds declarations in their extents. We also have to make sure that statements within the extent of bounds declaration maintain the flow-sensitive bounds declarations: #1211
The bounds widening for pointers to null-terminated arrays relies on flow-sensitive bounds declarations for widening bounds using
strlen. Currently the bounds widening is unsound because the flow-sensitive bounds declarations are not checked or used. We should implement flow-sensitive bounds checking. The implementation can be done in 4 stages:_Whereclauses: #1209