Examples of org.deuce.objectweb.asm.tree.TryCatchBlockNode

org.deuce.objectweb.asm.tree.TryCatchBlockNode
A node that represents a try catch block. @author Eric Bruneton

        // Now, make sure we also include any applicable exception handlers
        boolean loop = true;
        while (loop) {
            loop = false;
            for (Iterator it = tryCatchBlocks.iterator(); it.hasNext();) {
                TryCatchBlockNode trycatch = (TryCatchBlockNode) it.next();


                if (LOGGING) {
                    // TODO use of default toString().
                    log("Scanning try/catch " + trycatch);
                }

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            }
        }


        // Emit try/catch blocks that are relevant to this method.
        for (Iterator it = tryCatchBlocks.iterator(); it.hasNext();) {
            TryCatchBlockNode trycatch = (TryCatchBlockNode) it.next();


            if (LOGGING) {
                // TODO use of default toString().
                log("try catch block original labels=" + trycatch.start + '-'
                        + trycatch.end + "->" + trycatch.handler);
            }


            final LabelNode start = instant.rangeLabel(trycatch.start);
            final LabelNode end = instant.rangeLabel(trycatch.end);


            // Ignore empty try/catch regions
            if (start == end) {
                if (LOGGING) {
                    log(" try catch block empty in this subroutine");
                }
                continue;
            }


            final LabelNode handler = instant.gotoLabel(trycatch.handler);


            if (LOGGING) {
                // TODO use of default toString().
                log(" try catch block new labels=" + start + '-' + end + "->"
                        + handler);
            }


            if (start == null || end == null || handler == null) {
                throw new RuntimeException("Internal error!");
            }


            newTryCatchBlocks.add(new TryCatchBlockNode(start,
                    end,
                    handler,
                    trycatch.type));
        }

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        queue = new int[n];
        top = 0;


        // computes exception handlers for each instruction
        for (int i = 0; i < m.tryCatchBlocks.size(); ++i) {
            TryCatchBlockNode tcb = (TryCatchBlockNode) m.tryCatchBlocks.get(i);
            int begin = insns.indexOf(tcb.start);
            int end = insns.indexOf(tcb.end);
            for (int j = begin; j < end; ++j) {
                List insnHandlers = handlers[j];
                if (insnHandlers == null) {
                    insnHandlers = new ArrayList();
                    handlers[j] = insnHandlers;
                }
                insnHandlers.add(tcb);
            }
        }


        // computes the subroutine for each instruction:
        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);
        current.setReturn(interpreter.newValue(Type.getReturnType(m.desc)));
        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;


            AbstractInsnNode insnNode = null;
            try {
                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);
                        if (insnOpcode == JSR) {
                            merge(jump, current, new Subroutine(j.label,
                                    m.maxLocals,
                                    j));
                        } else {
                            merge(jump, current, subroutine);
                        }
                        newControlFlowEdge(insn, jump);
                    } else if (insnNode instanceof LookupSwitchInsnNode) {
                        LookupSwitchInsnNode lsi = (LookupSwitchInsnNode) insnNode;
                        int jump = insns.indexOf(lsi.dflt);
                        merge(jump, current, subroutine);
                        newControlFlowEdge(insn, jump);
                        for (int j = 0; j < lsi.labels.size(); ++j) {
                            LabelNode label = (LabelNode) lsi.labels.get(j);
                            jump = insns.indexOf(label);
                            merge(jump, current, subroutine);
                            newControlFlowEdge(insn, jump);
                        }
                    } else if (insnNode instanceof TableSwitchInsnNode) {
                        TableSwitchInsnNode tsi = (TableSwitchInsnNode) insnNode;
                        int jump = insns.indexOf(tsi.dflt);
                        merge(jump, current, subroutine);
                        newControlFlowEdge(insn, jump);
                        for (int j = 0; j < tsi.labels.size(); ++j) {
                            LabelNode label = (LabelNode) tsi.labels.get(j);
                            jump = insns.indexOf(label);
                            merge(jump, current, subroutine);
                            newControlFlowEdge(insn, jump);
                        }
                    } else if (insnOpcode == RET) {
                        if (subroutine == null) {
                            throw new AnalyzerException(insnNode, "RET instruction outside of a sub routine");
                        }
                        for (int i = 0; i < subroutine.callers.size(); ++i) {
                            Object caller = subroutine.callers.get(i);
                            int call = insns.indexOf((AbstractInsnNode) caller);
                            if (frames[call] != null) {
                                merge(call + 1,
                                        frames[call],
                                        current,
                                        subroutines[call],
                                        subroutine.access);
                                newControlFlowEdge(insn, call + 1);
                            }
                        }
                    } else if (insnOpcode != ATHROW
                            && (insnOpcode < IRETURN || insnOpcode > RETURN))
                    {
                        if (subroutine != null) {
                            if (insnNode instanceof VarInsnNode) {
                                int var = ((VarInsnNode) insnNode).var;
                                subroutine.access[var] = true;
                                if (insnOpcode == LLOAD || insnOpcode == DLOAD
                                        || insnOpcode == LSTORE
                                        || insnOpcode == DSTORE)
                                {
                                    subroutine.access[var + 1] = true;
                                }
                            } else if (insnNode instanceof IincInsnNode) {
                                int var = ((IincInsnNode) insnNode).var;
                                subroutine.access[var] = true;
                            }
                        }
                        merge(insn + 1, current, subroutine);
                        newControlFlowEdge(insn, insn + 1);
                    }
                }


                List insnHandlers = handlers[insn];
                if (insnHandlers != null) {
                    for (int i = 0; i < insnHandlers.size(); ++i) {
                        TryCatchBlockNode tcb = (TryCatchBlockNode) insnHandlers.get(i);
                        Type type;
                        if (tcb.type == null) {
                            type = Type.getObjectType("java/lang/Throwable");
                        } else {
                            type = Type.getObjectType(tcb.type);

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            // calls findSubroutine recursively on exception handler successors
            List insnHandlers = handlers[insn];
            if (insnHandlers != null) {
                for (int i = 0; i < insnHandlers.size(); ++i) {
                    TryCatchBlockNode tcb = (TryCatchBlockNode) insnHandlers.get(i);
                    findSubroutine(insns.indexOf(tcb.handler), sub, calls);
                }
            }


            // if insn does not falls through to the next instruction, return.

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Related Classes of org.deuce.objectweb.asm.tree.TryCatchBlockNode

org.deuce.objectweb.asm.commons.JSRInlinerAdapter

org.deuce.objectweb.asm.tree.analysis.Analyzer

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