Examples of org.objectweb.asm.tree.TryCatchBlockNode

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

        boolean loop = true;
        while (loop) {
            loop = false;
            for (Iterator<TryCatchBlockNode> it = tryCatchBlocks.iterator(); it
                    .hasNext();) {
                TryCatchBlockNode trycatch = 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<TryCatchBlockNode> it = tryCatchBlocks.iterator(); it
                .hasNext();) {
            TryCatchBlockNode trycatch = 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));
        }


        for (Iterator<LocalVariableNode> it = localVariables.iterator(); it
                .hasNext();) {

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


        // computes the subroutine for each instruction:
        Subroutine main = new Subroutine(null, m.maxLocals, null);
        List<AbstractInsnNode> subroutineCalls = new ArrayList<AbstractInsnNode>();
        Map<LabelNode, Subroutine> subroutineHeads = new HashMap<LabelNode, Subroutine>();
        findSubroutine(0, main, subroutineCalls);
        while (!subroutineCalls.isEmpty()) {
            JumpInsnNode jsr = (JumpInsnNode) subroutineCalls.remove(0);
            Subroutine sub = 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<V> current = newFrame(m.maxLocals, m.maxStack);
        Frame<V> 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);


        init(owner, m);


        // control flow analysis
        while (top > 0) {
            int insn = queue[--top];
            Frame<V> 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 = 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 = 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) {
                            JumpInsnNode caller = subroutine.callers.get(i);
                            int call = insns.indexOf(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<TryCatchBlockNode> insnHandlers = handlers[insn];
                if (insnHandlers != null) {
                    for (int i = 0; i < insnHandlers.size(); ++i) {
                        TryCatchBlockNode tcb = 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<TryCatchBlockNode> insnHandlers = handlers[insn];
            if (insnHandlers != null) {
                for (int i = 0; i < insnHandlers.size(); ++i) {
                    TryCatchBlockNode tcb = 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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        // doesn't care for it.
        if (tcbs.size() == 0) return;
        ArrayList<Handler> handlers= new ArrayList<Handler>(tcbs.size());
        
        for (int i = 0; i < tcbs.size(); i++) {
            TryCatchBlockNode tcb = tcbs.get(i);
            handlers.add(new Handler(
                    getLabelPosition(tcb.start),
                    getLabelPosition(tcb.end) - 1, // end is inclusive
                    tcb.type, 
                    getOrCreateBasicBlock(tcb.handler)));

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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;


            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);
                        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("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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                mv.visitTryCatchBlock(ls[0], ls[1], ls[2], "java/lang/reflect/InvocationTargetException");
            }
        }


        for (Object o : mn.tryCatchBlocks) {
            TryCatchBlockNode tcb = (TryCatchBlockNode) o;
            if (EXCEPTION_NAME.equals(tcb.type) && !hasAnnotation) // we allow catch of SuspendExecution in method annotated with @Suspendable.
                throw new UnableToInstrumentException("catch for SuspendExecution", className, mn.name, mn.desc);
            if (handleProxyInvocations && UNDECLARED_THROWABLE_NAME.equals(tcb.type)) // we allow catch of SuspendExecution in method annotated with @Suspendable.
                throw new UnableToInstrumentException("catch for UndeclaredThrowableException", className, mn.name, mn.desc);
//          if (INTERRUPTED_EXCEPTION_NAME.equals(tcb.type))
//              throw new UnableToInstrumentException("catch for " + InterruptedException.class.getSimpleName(), className, mn.name, mn.desc);


            tcb.accept(mv);
        }


        if (mn.visibleParameterAnnotations != null)
            dumpParameterAnnotations(mv, mn.visibleParameterAnnotations, true);

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    }


    @SuppressWarnings("unchecked")
    private void splitTryCatch(FrameInfo fi) {
        for (int i = 0; i < mn.tryCatchBlocks.size(); i++) {
            TryCatchBlockNode tcb = (TryCatchBlockNode) mn.tryCatchBlocks.get(i);


            int start = getLabelIdx(tcb.start);
            int end = getLabelIdx(tcb.end);


            if (start <= fi.endInstruction && end >= fi.endInstruction) {
                db.log(LogLevel.DEBUG, "Splitting try-catch in %s, block %d call at instruction %d", mn.name, i, fi.endInstruction);
                //System.out.println("i="+i+" start="+start+" end="+end+" split="+splitIdx+
                //        " start="+mn.instructions.get(start)+" end="+mn.instructions.get(end));


                // need to split try/catch around the suspendable call
                if (start == fi.endInstruction) {
                    tcb.start = fi.createAfterLabel();
                } else {
                    if (end > fi.endInstruction) {
                        TryCatchBlockNode tcb2 = new TryCatchBlockNode(
                                fi.createAfterLabel(),
                                tcb.end, tcb.handler, tcb.type);
                        mn.tryCatchBlocks.add(i + 1, tcb2);
                    }

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                }
            }
        }


        for (Object o : mn.tryCatchBlocks) {
            final TryCatchBlockNode tcb = (TryCatchBlockNode) o;
            if (EXCEPTION_NAME.equals(tcb.type) && !hasAnnotation) // we allow catch of SuspendExecution in method annotated with @Suspendable.
                throw new UnableToInstrumentException("catch for SuspendExecution", className, mn.name, mn.desc);
            if (handleProxyInvocations && UNDECLARED_THROWABLE_NAME.equals(tcb.type)) // we allow catch of SuspendExecution in method annotated with @Suspendable.
                throw new UnableToInstrumentException("catch for UndeclaredThrowableException", className, mn.name, mn.desc);
//          if (INTERRUPTED_EXCEPTION_NAME.equals(tcb.type))
//              throw new UnableToInstrumentException("catch for " + InterruptedException.class.getSimpleName(), className, mn.name, mn.desc);
            tcb.accept(mv);
        }


        if (mn.visibleParameterAnnotations != null)
            dumpParameterAnnotations(mv, mn.visibleParameterAnnotations, true);

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