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.

Usage

The command-line options related to constant folding are:

Example

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.

Dependencies

This plug-in uses the results of the Value analysis plug-in.