Examples of org.jruby.ir.dataflow.DataFlowVar

org.jruby.ir.dataflow.DataFlowVar
Represents some data flow fact about some dataflow problem

    public FlowGraphNode buildFlowGraphNode(BasicBlock bb) {
        return new LiveVariableNode(this, bb);
    }


    public void addDFVar(Variable v) {
        DataFlowVar dfv = new DataFlowVar(this);
        dfVarMap.put(v, dfv);
        varDfVarMap.put(dfv.id, v);
        if ((v instanceof LocalVariable) && !((LocalVariable) v).isSelf()) {
            //System.out.println("Adding df var for " + v + ":" + dfv.id);
            int n = ((LocalVariable)v).getScopeDepth();

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            markVariableLive(lvp, living, variable);
        }
    }


    private void markVariableLive(LiveVariablesProblem lvp, BitSet living, Variable x) {
        DataFlowVar dv = lvp.getDFVar(x);


        // A buggy Ruby program that uses but does not assign a value to a var
        // will be null.
        if (dv != null) living.set(dv.getId());
    }

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        while (it.hasPrevious()) {
            Instr i = it.previous();
            // System.out.println("DEAD?? " + i);
            if (i instanceof ResultInstr) {
                Variable v = ((ResultInstr) i).getResult();
                DataFlowVar dv = lvp.getDFVar(v);


                // If 'v' is not live at the instruction site, and it has no side effects, mark it dead!
                // System.out.println("df var for " + v + " is " + dv.getId());
                if (living.get(dv.getId())) {
                    living.clear(dv.getId());
                    // System.out.println("NO! LIVE result:" + v);
                } else if (i.canBeDeleted(scope)) {
                    // System.out.println("YES!");
                    i.markDead();
                    it.remove();

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Related Classes of org.jruby.ir.dataflow.DataFlowVar

org.jruby.ir.dataflow.analyses.LiveVariableNode

org.jruby.ir.dataflow.analyses.LiveVariablesProblem

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