Examples of org.enclojure.ide.asm.tree.JumpInsnNode

org.enclojure.ide.asm.tree.JumpInsnNode
A node that represents a jump instruction. A jump instruction is an instruction that may jump to another instruction. @author Eric Bruneton

        Subroutine main = new Subroutine(null, m.maxLocals, null);
        List subroutineCalls = new ArrayList();
        Map subroutineHeads = new HashMap();
        findSubroutine(0, main, subroutineCalls);
        while (!subroutineCalls.isEmpty()) {
            JumpInsnNode jsr = (JumpInsnNode) subroutineCalls.remove(0);
            Subroutine sub = (Subroutine) subroutineHeads.get(jsr.label);
            if (sub == null) {
                sub = new Subroutine(jsr.label, m.maxLocals, jsr);
                subroutineHeads.put(jsr.label, sub);
                findSubroutine(insns.indexOf(jsr.label), sub, subroutineCalls);
            } else {
                sub.callers.add(jsr);
            }
        }
        for (int i = 0; i < n; ++i) {
            if (subroutines[i] != null && subroutines[i].start == null) {
                subroutines[i] = null;
            }
        }


        // initializes the data structures for the control flow analysis
        Frame current = newFrame(m.maxLocals, m.maxStack);
        Frame handler = newFrame(m.maxLocals, m.maxStack);
        Type[] args = Type.getArgumentTypes(m.desc);
        int local = 0;
        if ((m.access & ACC_STATIC) == 0) {
            Type ctype = Type.getObjectType(owner);
            current.setLocal(local++, interpreter.newValue(ctype));
        }
        for (int i = 0; i < args.length; ++i) {
            current.setLocal(local++, interpreter.newValue(args[i]));
            if (args[i].getSize() == 2) {
                current.setLocal(local++, interpreter.newValue(null));
            }
        }
        while (local < m.maxLocals) {
            current.setLocal(local++, interpreter.newValue(null));
        }
        merge(0, current, null);


        // control flow analysis
        while (top > 0) {
            int insn = queue[--top];
            Frame f = frames[insn];
            Subroutine subroutine = subroutines[insn];
            queued[insn] = false;


            try {
                AbstractInsnNode insnNode = m.instructions.get(insn);
                int insnOpcode = insnNode.getOpcode();
                int insnType = insnNode.getType();


                if (insnType == AbstractInsnNode.LABEL
                        || insnType == AbstractInsnNode.LINE
                        || insnType == AbstractInsnNode.FRAME)
                {
                    merge(insn + 1, f, subroutine);
                    newControlFlowEdge(insn, insn + 1);
                } else {
                    current.init(f).execute(insnNode, interpreter);
                    subroutine = subroutine == null ? null : subroutine.copy();


                    if (insnNode instanceof JumpInsnNode) {
                        JumpInsnNode j = (JumpInsnNode) insnNode;
                        if (insnOpcode != GOTO && insnOpcode != JSR) {
                            merge(insn + 1, current, subroutine);
                            newControlFlowEdge(insn, insn + 1);
                        }
                        int jump = insns.indexOf(j.label);

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            if (node instanceof JumpInsnNode) {
                if (node.getOpcode() == JSR) {
                    // do not follow a JSR, it leads to another subroutine!
                    calls.add(node);
                } else {
                    JumpInsnNode jnode = (JumpInsnNode) node;
                    findSubroutine(insns.indexOf(jnode.label), sub, calls);
                }
            } else if (node instanceof TableSwitchInsnNode) {
                TableSwitchInsnNode tsnode = (TableSwitchInsnNode) node;
                findSubroutine(insns.indexOf(tsnode.dflt), sub, calls);

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            if (node.getType() == AbstractInsnNode.JUMP_INSN
                    && node.getOpcode() != JSR)
            {
                // we do not follow recursively called subroutines here; but any
                // other sort of branch we do follow
                JumpInsnNode jnode = (JumpInsnNode) node;
                int destidx = instructions.indexOf(jnode.label);
                markSubroutineWalkDFS(sub, destidx, anyvisited);
            }
            if (node.getType() == AbstractInsnNode.TABLESWITCH_INSN) {
                TableSwitchInsnNode tsnode = (TableSwitchInsnNode) node;

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                    // instruction, which should never happen for verifiable
                    // code.
                    throw new RuntimeException("Instruction #" + i
                            + " is a RET not owned by any subroutine");
                }
                newInstructions.add(new JumpInsnNode(GOTO, retlabel));
            } else if (insn.getOpcode() == JSR) {
                LabelNode lbl = ((JumpInsnNode) insn).label;
                Subroutine sub = (Subroutine) subroutineHeads.get(lbl);
                Instantiation newinst = new Instantiation(instant, sub);
                LabelNode startlbl = newinst.gotoLabel(lbl);


                if (LOGGING) {
                    log(" Creating instantiation of subr " + sub);
                }


                // Rather than JSRing, we will jump to the inline version and
                // push NULL for what was once the return value. This hack
                // allows us to avoid doing any sort of data flow analysis to
                // figure out which instructions manipulate the old return value
                // pointer which is now known to be unneeded.
                newInstructions.add(new InsnNode(ACONST_NULL));
                newInstructions.add(new JumpInsnNode(GOTO, startlbl));
                newInstructions.add(newinst.returnLabel);


                // Insert this new instantiation into the queue to be emitted
                // later.
                worklist.add(newinst);

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Related Classes of org.enclojure.ide.asm.tree.JumpInsnNode

org.enclojure.ide.asm.commons.JSRInlinerAdapter

org.enclojure.ide.asm.tree.analysis.Analyzer

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