Examples with CHECKCAST org.apache.bcel.generic.CHECKCAST used on opensource projects

Example 1 with CHECKCAST

use of org.apache.bcel.generic.CHECKCAST in project jop by jop-devel.

the class CallStringReceiverTypes method transfer.

public ContextMap<CallString, Set<TypeMapping>> transfer(InstructionHandle stmt, FlowEdge edge, ContextMap<CallString, Set<TypeMapping>> input, Interpreter<CallString, Set<TypeMapping>> interpreter, Map<InstructionHandle, ContextMap<CallString, Set<TypeMapping>>> state) {
    Context context = new Context(input.getContext());
    Set<TypeMapping> in = input.get(context.callString);
    ContextMap<CallString, Set<TypeMapping>> retval = new ContextMap<CallString, Set<TypeMapping>>(context, new LinkedHashMap<CallString, Set<TypeMapping>>());
    Set<TypeMapping> result = new LinkedHashSet<TypeMapping>();
    retval.put(context.callString, result);
    Instruction instruction = stmt.getInstruction();
    switch(instruction.getOpcode()) {
        case Constants.NOP:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.ACONST_NULL:
        case Constants.ICONST_M1:
        case Constants.ICONST_0:
        case Constants.ICONST_1:
        case Constants.ICONST_2:
        case Constants.ICONST_3:
        case Constants.ICONST_4:
        case Constants.ICONST_5:
        case Constants.BIPUSH:
        case Constants.SIPUSH:
        case Constants.FCONST_0:
        case Constants.FCONST_1:
        case Constants.FCONST_2:
        case Constants.LCONST_0:
        case Constants.LCONST_1:
        case Constants.DCONST_0:
        case Constants.DCONST_1:
        case Constants.LDC2_W:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.LDC:
        case Constants.LDC_W:
            {
                LDC instr = (LDC) instruction;
                result = new LinkedHashSet<TypeMapping>(in);
                retval.put(context.callString, result);
                Type type = instr.getType(context.constPool());
                if (type.equals(Type.STRING)) {
                    result.add(new TypeMapping(context.stackPtr, type.toString()));
                    String value = type.toString() + ".value";
                    String name = "char[]";
                    name += "@" + context.method() + ":" + stmt.getPosition();
                    result.add(new TypeMapping(value, name));
                }
            }
            break;
        case Constants.DUP:
            {
                for (TypeMapping m : in) {
                    result.add(m);
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(context.stackPtr, m.type));
                    }
                }
            }
            break;
        case Constants.DUP_X1:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 2) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(context.stackPtr - 2, m.type));
                        result.add(new TypeMapping(context.stackPtr, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 2) {
                        result.add(new TypeMapping(context.stackPtr - 1, m.type));
                    }
                }
            }
            break;
        case Constants.DUP_X2:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 3) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(context.stackPtr - 3, m.type));
                        result.add(new TypeMapping(context.stackPtr, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 2) {
                        result.add(new TypeMapping(context.stackPtr - 1, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 3) {
                        result.add(new TypeMapping(context.stackPtr - 2, m.type));
                    }
                }
            }
            break;
        case Constants.DUP2:
            {
                for (TypeMapping m : in) {
                    result.add(m);
                    if (m.stackLoc == context.stackPtr - 2) {
                        result.add(new TypeMapping(context.stackPtr, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(context.stackPtr + 1, m.type));
                    }
                }
            }
            break;
        case Constants.DUP2_X1:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 3) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 2) {
                        result.add(new TypeMapping(context.stackPtr - 3, m.type));
                        result.add(new TypeMapping(context.stackPtr, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(context.stackPtr - 2, m.type));
                        result.add(new TypeMapping(context.stackPtr + 1, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 3) {
                        result.add(new TypeMapping(context.stackPtr - 1, m.type));
                    }
                }
            }
            break;
        case Constants.DUP2_X2:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 3) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 2) {
                        result.add(new TypeMapping(context.stackPtr - 4, m.type));
                        result.add(new TypeMapping(context.stackPtr, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(context.stackPtr - 3, m.type));
                        result.add(new TypeMapping(context.stackPtr + 1, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 4) {
                        result.add(new TypeMapping(context.stackPtr - 2, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 3) {
                        result.add(new TypeMapping(context.stackPtr - 1, m.type));
                    }
                }
            }
            break;
        case Constants.SWAP:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 2) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 2) {
                        result.add(new TypeMapping(context.stackPtr - 1, m.type));
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(context.stackPtr - 2, m.type));
                    }
                }
            }
            break;
        case Constants.POP:
            filterSet(in, result, context.stackPtr - 1);
            break;
        case Constants.POP2:
            filterSet(in, result, context.stackPtr - 2);
            break;
        case Constants.GETFIELD:
            {
                GETFIELD instr = (GETFIELD) instruction;
                List<String> receivers = new LinkedList<String>();
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 1) {
                        result.add(m);
                    } else if (m.stackLoc == context.stackPtr - 1) {
                        receivers.add(m.type);
                    }
                }
                //			if (receivers.isEmpty()
                //				&& instr.getFieldType(context.constPool) != Type.INT) {
                //				System.out.println("GETFIELD not found: "+context.method+"@"+stmt+": "+instr.getFieldName(context.constPool));
                ////				System.exit(1);
                //			}
                DFATool p = interpreter.getDFATool();
                String fieldName = instr.getFieldName(context.constPool());
                for (String receiver : receivers) {
                    //String heapLoc = receiver + "." + instr.getFieldName(context.constPool);
                    //String namedLoc = receiver.split("@")[0] + "." + instr.getFieldName(context.constPool);
                    String className = receiver.split("@")[0];
                    ClassInfo classInfo = p.classForField(className, fieldName);
                    if (classInfo != null) {
                        String heapLoc = classInfo.getClassName() + "." + fieldName;
                        recordReceiver(stmt, context, heapLoc);
                        for (TypeMapping m : in) {
                            if (heapLoc.equals(m.heapLoc)) {
                                result.add(new TypeMapping(context.stackPtr - 1, m.type));
                            }
                        }
                    }
                }
            }
            break;
        case Constants.PUTFIELD:
            {
                PUTFIELD instr = (PUTFIELD) instruction;
                List<String> receivers = new LinkedList<String>();
                int fieldSize = instr.getFieldType(context.constPool()).getSize();
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 1 - fieldSize) {
                        result.add(m);
                    } else if (m.stackLoc == context.stackPtr - 1 - fieldSize) {
                        receivers.add(m.type);
                    }
                }
                //			if (receivers.isEmpty()) {
                //				System.out.println("PUTFIELD not found: "+context.method+"@"+stmt+": "+instr.getFieldName(context.constPool));
                ////				System.exit(-1);
                //			}
                DFATool p = interpreter.getDFATool();
                String fieldName = instr.getFieldName(context.constPool());
                for (String receiver : receivers) {
                    //String heapLoc = receiver + "." + instr.getFieldName(context.constPool);
                    //String namedLoc = receiver.split("@")[0] + "." + instr.getFieldName(context.constPool);
                    String className = receiver.split("@")[0];
                    ClassInfo classInfo = p.classForField(className, fieldName);
                    if (classInfo != null) {
                        String heapLoc = classInfo.getClassName() + "." + fieldName;
                        recordReceiver(stmt, context, heapLoc);
                        for (TypeMapping m : in) {
                            if (!heapLoc.equals(m.heapLoc) || context.threaded) {
                                result.add(m);
                            }
                            if (m.stackLoc == context.stackPtr - 1) {
                                result.add(new TypeMapping(heapLoc, m.type));
                            }
                        }
                    }
                }
                if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
                    doInvokeStatic("com.jopdesign.sys.JVM.f_putfield_ref(III)V", stmt, context, input, interpreter, state, retval);
                }
            }
            break;
        case Constants.GETSTATIC:
            {
                GETSTATIC instr = (GETSTATIC) instruction;
                DFATool p = interpreter.getDFATool();
                FieldRef ref = context.getMethodInfo().getCode().getFieldRef(instr);
                String fieldName = ref.getName();
                String className = ref.getClassName();
                ClassInfo classInfo = p.classForField(className, fieldName);
                if (classInfo != null) {
                    String heapLoc = classInfo.getClassName() + "." + fieldName;
                    recordReceiver(stmt, context, heapLoc);
                    for (TypeMapping m : in) {
                        if (m.stackLoc < context.stackPtr) {
                            result.add(m);
                        }
                        if (heapLoc.equals(m.heapLoc)) {
                            result.add(new TypeMapping(context.stackPtr, m.type));
                        }
                    }
                } else {
                //				System.out.println("GETSTATIC not found: "+heapLoc);
                //				System.exit(1);
                }
            }
            break;
        case Constants.PUTSTATIC:
            {
                PUTSTATIC instr = (PUTSTATIC) instruction;
                DFATool p = interpreter.getDFATool();
                FieldRef ref = context.getMethodInfo().getCode().getFieldRef(instr);
                String fieldName = ref.getName();
                String className = ref.getClassName();
                ClassInfo classInfo = p.classForField(className, fieldName);
                if (classInfo != null) {
                    String heapLoc = classInfo.getClassName() + "." + fieldName;
                    recordReceiver(stmt, context, heapLoc);
                    for (TypeMapping m : in) {
                        if (m.stackLoc >= 0 && m.stackLoc < context.stackPtr - 1) {
                            result.add(m);
                        } else if (m.stackLoc == -1 && (!heapLoc.equals(m.heapLoc) || context.threaded)) {
                            result.add(m);
                        }
                        if (m.stackLoc == context.stackPtr - 1) {
                            result.add(new TypeMapping(heapLoc, m.type));
                        }
                    }
                } else {
                //				System.out.println("PUTSTATIC not found: "+heapLoc);
                //				System.exit(1);
                }
                if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
                    doInvokeStatic("com.jopdesign.sys.JVM.f_putstatic_ref(II)V", stmt, context, input, interpreter, state, retval);
                }
            }
            break;
        case Constants.ARRAYLENGTH:
            for (TypeMapping m : in) {
                if (m.stackLoc < context.stackPtr - 1) {
                    result.add(m);
                }
                if (m.stackLoc == context.stackPtr - 1) {
                    recordReceiver(stmt, context, m.type);
                }
            }
            break;
        case Constants.IASTORE:
        case Constants.BASTORE:
        case Constants.CASTORE:
        case Constants.SASTORE:
        case Constants.FASTORE:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 3) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 3) {
                        recordReceiver(stmt, context, m.type);
                    }
                }
            }
            break;
        case Constants.LASTORE:
        case Constants.DASTORE:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 4) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 4) {
                        recordReceiver(stmt, context, m.type);
                    }
                }
            }
            break;
        case Constants.AASTORE:
            {
                List<String> receivers = new LinkedList<String>();
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 3) {
                        result.add(m);
                    } else if (m.stackLoc == context.stackPtr - 3) {
                        receivers.add(m.type);
                        recordReceiver(stmt, context, m.type);
                    }
                }
                for (String healLoc : receivers) {
                    for (TypeMapping m : in) {
                        if (m.stackLoc == context.stackPtr - 1) {
                            result.add(new TypeMapping(healLoc, m.type));
                        }
                    }
                }
                doInvokeStatic("com.jopdesign.sys.JVM.f_aastore(III)V", stmt, context, input, interpreter, state, retval);
            }
            break;
        case Constants.IALOAD:
        case Constants.BALOAD:
        case Constants.CALOAD:
        case Constants.SALOAD:
        case Constants.FALOAD:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 2) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 2) {
                        recordReceiver(stmt, context, m.type);
                    }
                }
            }
            break;
        case Constants.LALOAD:
        case Constants.DALOAD:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 2) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 2) {
                        recordReceiver(stmt, context, m.type);
                    }
                }
            }
            break;
        case Constants.AALOAD:
            {
                List<String> receivers = new LinkedList<String>();
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 2) {
                        result.add(m);
                    } else if (m.stackLoc == context.stackPtr - 2) {
                        receivers.add(m.type);
                        recordReceiver(stmt, context, m.type);
                    }
                }
                for (String heapLoc : receivers) {
                    for (TypeMapping m : in) {
                        if (heapLoc.equals(m.heapLoc)) {
                            result.add(new TypeMapping(context.stackPtr - 2, m.type));
                        }
                    }
                }
            }
            break;
        case Constants.NEW:
            {
                NEW instr = (NEW) instruction;
                filterSet(in, result, context.stackPtr);
                String name = instr.getType(context.constPool()).toString();
                name += "@" + context.method() + ":" + stmt.getPosition();
                result.add(new TypeMapping(context.stackPtr, name));
                doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(I)I", stmt, context, input, interpreter, state, retval);
            }
            break;
        case Constants.ANEWARRAY:
            {
                ANEWARRAY instr = (ANEWARRAY) instruction;
                filterSet(in, result, context.stackPtr - 1);
                String name = instr.getType(context.constPool()).toString() + "[]";
                name += "@" + context.method() + ":" + stmt.getPosition();
                result.add(new TypeMapping(context.stackPtr - 1, name));
                doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(II)I", stmt, context, input, interpreter, state, retval);
            }
            break;
        case Constants.NEWARRAY:
            {
                NEWARRAY instr = (NEWARRAY) instruction;
                filterSet(in, result, context.stackPtr - 1);
                String name = instr.getType().toString();
                name += "@" + context.method() + ":" + stmt.getPosition();
                result.add(new TypeMapping(context.stackPtr - 1, name));
                doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(II)I", stmt, context, input, interpreter, state, retval);
            }
            break;
        case Constants.MULTIANEWARRAY:
            {
                MULTIANEWARRAY instr = (MULTIANEWARRAY) instruction;
                int dim = instr.getDimensions();
                filterSet(in, result, context.stackPtr - dim);
                String type = instr.getType(context.constPool()).toString();
                type = type.substring(0, type.indexOf("["));
                for (int i = 1; i <= dim; i++) {
                    String type1 = type;
                    String type2 = type;
                    for (int k = 0; k < i; k++) {
                        type1 += "[]";
                    }
                    for (int k = 0; k < i - 1; k++) {
                        type2 += "[]";
                    }
                    type1 += "@" + context.method() + ":" + stmt.getPosition();
                    type2 += "@" + context.method() + ":" + stmt.getPosition();
                    result.add(new TypeMapping(type1, type2));
                }
                String name = instr.getType(context.constPool()).toString();
                name += "@" + context.method() + ":" + stmt.getPosition();
                result.add(new TypeMapping(context.stackPtr - dim, name));
                doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "()I", stmt, context, input, interpreter, state, retval);
            }
            break;
        case Constants.ILOAD_0:
        case Constants.ILOAD_1:
        case Constants.ILOAD_2:
        case Constants.ILOAD_3:
        case Constants.ILOAD:
        case Constants.FLOAD_0:
        case Constants.FLOAD_1:
        case Constants.FLOAD_2:
        case Constants.FLOAD_3:
        case Constants.FLOAD:
        case Constants.LLOAD_0:
        case Constants.LLOAD_1:
        case Constants.LLOAD_2:
        case Constants.LLOAD_3:
        case Constants.LLOAD:
        case Constants.DLOAD_0:
        case Constants.DLOAD_1:
        case Constants.DLOAD_2:
        case Constants.DLOAD_3:
        case Constants.DLOAD:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.ALOAD_0:
        case Constants.ALOAD_1:
        case Constants.ALOAD_2:
        case Constants.ALOAD_3:
        case Constants.ALOAD:
            {
                LoadInstruction instr = (LoadInstruction) instruction;
                int index = instr.getIndex();
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr) {
                        result.add(m);
                    }
                    if (m.stackLoc == index) {
                        result.add(new TypeMapping(context.stackPtr, m.type));
                    }
                }
            }
            break;
        case Constants.ISTORE_0:
        case Constants.ISTORE_1:
        case Constants.ISTORE_2:
        case Constants.ISTORE_3:
        case Constants.ISTORE:
        case Constants.FSTORE_0:
        case Constants.FSTORE_1:
        case Constants.FSTORE_2:
        case Constants.FSTORE_3:
        case Constants.FSTORE:
        case Constants.LSTORE_0:
        case Constants.LSTORE_1:
        case Constants.LSTORE_2:
        case Constants.LSTORE_3:
        case Constants.LSTORE:
        case Constants.DSTORE_0:
        case Constants.DSTORE_1:
        case Constants.DSTORE_2:
        case Constants.DSTORE_3:
        case Constants.DSTORE:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.ASTORE_0:
        case Constants.ASTORE_1:
        case Constants.ASTORE_2:
        case Constants.ASTORE_3:
        case Constants.ASTORE:
            {
                StoreInstruction instr = (StoreInstruction) instruction;
                int index = instr.getIndex();
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 1 && m.stackLoc != index) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(index, m.type));
                    }
                }
            }
            break;
        case Constants.FCMPL:
        case Constants.FCMPG:
        case Constants.LCMP:
        case Constants.DCMPL:
        case Constants.DCMPG:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.IFEQ:
        case Constants.IFNE:
        case Constants.IFLT:
        case Constants.IFGE:
        case Constants.IFGT:
        case Constants.IFLE:
        case Constants.IFNULL:
        case Constants.IFNONNULL:
            filterSet(in, result, context.stackPtr - 1);
            break;
        case Constants.IF_ICMPEQ:
        case Constants.IF_ICMPNE:
        case Constants.IF_ICMPLT:
        case Constants.IF_ICMPGE:
        case Constants.IF_ICMPGT:
        case Constants.IF_ICMPLE:
        case Constants.IF_ACMPEQ:
        case Constants.IF_ACMPNE:
            filterSet(in, result, context.stackPtr - 2);
            break;
        case Constants.TABLESWITCH:
        case Constants.LOOKUPSWITCH:
            filterSet(in, result, context.stackPtr - 1);
            break;
        case Constants.GOTO:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.IADD:
        case Constants.ISUB:
        case Constants.IMUL:
        case Constants.IDIV:
        case Constants.IREM:
        case Constants.ISHL:
        case Constants.ISHR:
        case Constants.IUSHR:
        case Constants.IAND:
        case Constants.IOR:
        case Constants.IXOR:
        case Constants.FADD:
        case Constants.FSUB:
        case Constants.FMUL:
        case Constants.FDIV:
        case Constants.FREM:
        case Constants.DADD:
        case Constants.DSUB:
        case Constants.DMUL:
        case Constants.DDIV:
        case Constants.DREM:
        case Constants.IINC:
        case Constants.INEG:
        case Constants.FNEG:
        case Constants.LNEG:
        case Constants.DNEG:
        case Constants.LADD:
        case Constants.LAND:
        case Constants.LOR:
        case Constants.LXOR:
        case Constants.LSUB:
        case Constants.LSHL:
        case Constants.LSHR:
        case Constants.LUSHR:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.LMUL:
        case Constants.LDIV:
        case Constants.LREM:
            result = new LinkedHashSet<TypeMapping>(in);
            retval.put(context.callString, result);
            doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(JJ)J", stmt, context, input, interpreter, state, retval);
            break;
        case Constants.I2B:
        case Constants.I2C:
        case Constants.I2S:
        case Constants.I2F:
        case Constants.F2I:
        case Constants.I2L:
        case Constants.I2D:
        case Constants.F2L:
        case Constants.F2D:
        case Constants.L2I:
        case Constants.D2I:
        case Constants.L2F:
        case Constants.D2F:
        case Constants.L2D:
        case Constants.D2L:
            result = in;
            retval.put(context.callString, result);
            break;
        case Constants.INSTANCEOF:
            filterSet(in, result, context.stackPtr - 1);
            break;
        case Constants.CHECKCAST:
            {
                DFATool p = interpreter.getDFATool();
                CHECKCAST instr = (CHECKCAST) instruction;
                for (TypeMapping m : in) {
                    if (m.stackLoc < context.stackPtr - 1) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        // check whether this class can possibly be cast
                        String constClassName = instr.getType(context.constPool()).toString();
                        ClassInfo staticClass = p.getAppInfo().getClassInfo(constClassName);
                        ClassInfo dynamicClass = p.getAppInfo().getClassInfo(m.type.split("@")[0]);
                        //					System.out.println("CHECKCAST: "+context.callString.asList()+"/"+context.method+": "+stmt+": "+constClassName+" vs "+m.type);
                        if (dynamicClass.isSubclassOf(staticClass)) {
                            result.add(m);
                        //							System.out.println("yay!");
                        }
                    }
                }
            }
            break;
        case Constants.MONITORENTER:
            filterSet(in, result, context.stackPtr - 1);
            context.syncLevel++;
            break;
        case Constants.MONITOREXIT:
            filterSet(in, result, context.stackPtr - 1);
            context.syncLevel--;
            if (context.syncLevel < 0) {
                System.err.println("Synchronization level mismatch.");
                System.exit(-1);
            }
            break;
        case Constants.INVOKEVIRTUAL:
        case Constants.INVOKEINTERFACE:
            {
                InvokeInstruction instr = (InvokeInstruction) instruction;
                int argSize = MethodHelper.getArgSize(instr, context.constPool());
                DFATool p = interpreter.getDFATool();
                MethodRef ref = context.getMethodInfo().getCode().getInvokeSite(stmt).getInvokeeRef();
                ClassInfo constClass = ref.getClassInfo();
                // find possible receiver types
                List<String> receivers = new LinkedList<String>();
                for (TypeMapping m : in) {
                    if (m.stackLoc == context.stackPtr - argSize) {
                        String clName = m.type.split("@")[0];
                        ClassInfo dynamicClass;
                        // check whether this class can possibly be a receiver
                        try {
                            dynamicClass = p.getAppInfo().getClassInfo(clName);
                        } catch (MissingClassError ex) {
                            logger.error("TRANSFER/" + instr + ": " + ex);
                            continue;
                        }
                        if ((instr instanceof INVOKEVIRTUAL && dynamicClass.isSubclassOf(constClass)) || (instr instanceof INVOKEINTERFACE && dynamicClass.isImplementationOf(constClass))) {
                            receivers.add(clName);
                        } else {
                            logger.debug(context.method() + ": class " + constClass + " is not a superclass of " + clName);
                        }
                    }
                }
                /* Get the actual set of invoked methods */
                //ArrayList<MethodInfo> invokeCandidates = new ArrayList<MethodInfo>();
                String signature = ref.getMethodSignature();
                for (String receiver : receivers) {
                    // find receiving method
                    MethodInfo impl = p.getAppInfo().getMethodInfoInherited(receiver, signature);
                    if (impl == null) {
                        throw new AppInfoError("Could not find implementation for: " + receiver + "#" + signature);
                    }
                    doInvokeVirtual(receiver, impl, stmt, context, input, interpreter, state, retval);
                }
                // add relevant information to result
                filterSet(in, result, context.stackPtr - argSize);
            }
            break;
        case Constants.INVOKESTATIC:
        case Constants.INVOKESPECIAL:
            {
                InvokeInstruction instr = (InvokeInstruction) instruction;
                int argSize = MethodHelper.getArgSize(instr, context.constPool());
                MethodRef ref = context.getMethodInfo().getCode().getInvokeSite(stmt).getInvokeeRef();
                MethodInfo impl = ref.getMethodInfo();
                if (impl == null) {
                    throw new AppInfoError("Cannot find implementation of " + ref);
                } else if (impl.isPrivate() && !impl.isStatic()) {
                    doInvokeVirtual(ref.getClassName(), impl, stmt, context, input, interpreter, state, retval);
                } else {
                    doInvokeStatic(impl.getMemberID().toString(), stmt, context, input, interpreter, state, retval);
                }
                // add relevant information to result
                filterSet(in, result, context.stackPtr - argSize);
            }
            break;
        case Constants.RETURN:
        case Constants.IRETURN:
        case Constants.FRETURN:
        case Constants.LRETURN:
        case Constants.DRETURN:
            filterSet(in, result, 0);
            break;
        case Constants.ARETURN:
            {
                for (TypeMapping m : in) {
                    if (m.stackLoc < 0) {
                        result.add(m);
                    }
                    if (m.stackLoc == context.stackPtr - 1) {
                        result.add(new TypeMapping(0, m.type));
                    }
                }
            }
            break;
        default:
            System.out.println("Unknown opcode: " + instruction.toString(context.constPool().getConstantPool()));
            System.exit(-1);
    }
    //		System.out.print(instruction+":\t{ ");
    //		for (Iterator k = result.iterator(); k.hasNext(); ) {
    //			ReceiverTypes.TypeMapping m = (ReceiverTypes.TypeMapping) k.next();
    //			if (m.stackLoc >= 0) {
    //				System.out.print("<stack[" + m.stackLoc + "], " + m.type +">, ");
    //			} else {
    //				System.out.print("<" + m.heapLoc + ", " + m.type +">, ");						
    //			}
    //		}
    //		System.out.println("}");				
    //		System.out.println("AFTER "+context.method+": "+stmt+" / "+context.callString.asList());
    //		System.out.print(stmt.getInstruction()+":\t{ ");
    //		System.out.print(context.callString.asList()+": "+retval.get(context.callString));
    //		System.out.println(" }");
    context.stackPtr += instruction.produceStack(context.constPool()) - instruction.consumeStack(context.constPool());
    return retval;
}

Example 2 with CHECKCAST

use of org.apache.bcel.generic.CHECKCAST in project jop by jop-devel.

the class SimpleInliner method analyzeInvokee.

/**
     * @param cs the callstring from the invoker to the invoke to inline (if recursive). Used to check DFA results.
     * @param invokee the invoked method to analyze
     * @param inlineData the map to populate with the parameters and the instructions to inline.
     * @return true if inlining is possible
     */
private boolean analyzeInvokee(CallString cs, MethodInfo invokee, InlineData inlineData) {
    // we allow loading of parameters, loading of constants, some instruction, and a return
    ValueMapAnalysis values = new ValueMapAnalysis(invokee);
    values.loadParameters();
    InstructionList il = invokee.getCode().getInstructionList(true, false);
    InstructionHandle ih = il.getStart();
    // we should at least have a return instruction, so even for empty methods we should fall through
    // generate the parameter mapping
    int count = 0;
    while (true) {
        Instruction instruction = ih.getInstruction();
        if (instruction instanceof PushInstruction || instruction instanceof NOP) {
            values.transfer(instruction);
            ih = ih.getNext();
            count++;
        } else {
            break;
        }
    }
    // store the mapping
    for (ValueInfo value : values.getValueTable().getStack()) {
        inlineData.addParam(value);
    }
    inlineData.setInlineStart(count);
    // if we do not need an NP check, we can also inline code which does not throw an exception in the same way
    boolean needsNPCheck = helper.needsNullpointerCheck(cs, invokee, false);
    boolean hasNPCheck = false;
    // we allow up to 5 instructions and one return before assuming that the resulting code will be too large
    for (int i = 0; i < 6; i++) {
        // now lets see what we have here as non-push instructions
        Instruction instruction = ih.getInstruction();
        if (instruction instanceof InvokeInstruction) {
            if (inlineData.getInvokeSite() != null) {
                // only inline at most one invoke
                return false;
            }
            InvokeSite is = invokee.getCode().getInvokeSite(ih);
            inlineData.setInvokeSite(is);
            hasNPCheck |= !is.isInvokeStatic();
        } else if (instruction instanceof FieldInstruction) {
            if (instruction instanceof GETFIELD) {
                hasNPCheck |= values.getValueTable().top().isThisReference();
            }
            if (instruction instanceof PUTFIELD) {
                int down = values.getValueTable().top().isContinued() ? 2 : 1;
                hasNPCheck |= values.getValueTable().top(down).isThisReference();
            }
        } else if (instruction instanceof ArithmeticInstruction || instruction instanceof ConversionInstruction || instruction instanceof StackInstruction || instruction instanceof LDC || instruction instanceof LDC2_W || instruction instanceof ARRAYLENGTH || instruction instanceof CHECKCAST || instruction instanceof NOP) {
        // nothing to do, just copy them
        } else if (instruction instanceof ReturnInstruction) {
            if (needsNPCheck && !hasNPCheck) {
                // We were nearly finished.. but NP check test failed
                this.requiresNPCheck++;
                if (logger.isTraceEnabled()) {
                    logger.trace("Not inlining " + invokee + " because it requires a NP check.");
                }
                return false;
            }
            // else we need to add pop instructions
            if (instruction instanceof RETURN) {
                // we do not return anything, so we must empty the stack
                while (values.getValueTable().getStackSize() > 0) {
                    Instruction pop;
                    if (values.getValueTable().top().isContinued()) {
                        pop = new POP2();
                    } else {
                        pop = new POP();
                    }
                    inlineData.addEpilogue(pop);
                    values.transfer(pop);
                }
                return true;
            } else {
                Type type = ((ReturnInstruction) instruction).getType();
                // javac anyway)
                return values.getValueTable().getStackSize() == type.getSize();
            }
        } else {
            // if we encounter an instruction which we do not handle, we do not inline
            unhandledInstructions++;
            if (logger.isTraceEnabled()) {
                logger.trace("Not inlining " + invokee + " because of unhandled instruction " + instruction.toString(invokee.getClassInfo().getConstantPoolGen().getConstantPool()));
            }
            return false;
        }
        // update the stack map since we need it to handle RETURN
        values.transfer(instruction);
        ih = ih.getNext();
    }
    // too many instructions, do not inline
    return false;
}