org.jruby.compiler.ir.compiler_pass.opts.DeadCodeElimination Maven / Gradle / Ivy
package org.jruby.compiler.ir.compiler_pass.opts;
import org.jruby.compiler.ir.IRScope;
import org.jruby.compiler.ir.IRMethod;
import org.jruby.compiler.ir.compiler_pass.CompilerPass;
import org.jruby.compiler.ir.representations.CFG;
import org.jruby.compiler.ir.dataflow.DataFlowConstants;
import org.jruby.compiler.ir.dataflow.analyses.LiveVariablesProblem;
public class DeadCodeElimination implements CompilerPass {
public boolean isPreOrder() {
return false;
}
public void run(IRScope s) {
if (!(s instanceof IRMethod)) return;
CFG c = ((IRMethod) s).getCFG();
LiveVariablesProblem lvp = (LiveVariablesProblem) c.getDataFlowSolution(DataFlowConstants.LVP_NAME);
if (lvp == null) {
lvp = new LiveVariablesProblem();
lvp.setup(c);
lvp.compute_MOP_Solution();
c.setDataFlowSolution(lvp.getName(), lvp);
}
lvp.markDeadInstructions();
}
}