Semantic constant folding plug-in
The Semantic constant folding plug-in produces an output program where C expressions which are established as constant by the Value analysis plug-in are replaced by their value. The output program is guaranteed to be compilable C code, and to have the same semantics as the original program.
The plug-in performs propagation of constant integers and addresses, but at this time, it does not handle floating-point values.
The command-line options related to constant folding are:
activate semantic constant folding and pretty print the new source code.
- -semantic-const-fold f1,...,fn
replace constant expressions in functions f1,...,fn.
allow introduction of new casts from a folded constant.
Consider the code fragment:
p = &x; x = 3; send(*p+4);
The Semantic constant folding plug-in produces:
p = &x; x = 3; send(7);
If you need to remove the (now useless) first two statements, you may make use of the Spare Code analysis plug-in.
This plug-in uses the results of the Value analysis plug-in.