Consider removing middle-end stringop/array warnings from -Wall
Richard Biener suggests using path rangers to prove paths to stringop/array warnings are not taken before emitting a diagnostic.
Richard Biener suggests leveraging path rangers to enhance the precision of stringop/array warnings. The goal is to reduce false positives by proving that the paths leading to potential issues are not actually taken. This approach aims to improve the accuracy of static analysis without relying solely on optimization to prune unreachable paths.
- proposer
Suggests using path rangers to verify that paths to a diagnostic are unreachable before the diagnostic is emitted.
“One thing that might be worth exploring is aggressively using path ranger to prove (all?) paths to a diagnostic we are about to emit are not taken.”
In Details
GCC's middle-end performs static analysis to detect potential stringop/array errors. Currently, this analysis relies heavily on optimizations to prune unreachable paths, leading to false positives. Using path rangers could provide more precise path analysis, reducing these false positives. This touches on GCC's internal representation (IL) and its interaction with optimization passes.
For Context
Compilers use static analysis to identify potential errors in code before it's even run, such as issues with string manipulation or array access. These checks sometimes produce false warnings, flagging code that seems problematic but is actually safe due to other conditions. One way to improve the accuracy of these checks is to use "path rangers," which trace the possible execution paths of the program to confirm whether the warning is truly relevant. This helps avoid unnecessary warnings and makes the compiler's analysis more reliable.