gettersetterinliner.java

j2me 混淆包,用于混淆j2me的原代码用的

                    // Fix the access.
                    ((ProgramFieldInfo)referencedFieldInfo).u2accessFlags =
                        AccessUtil.replaceAccessFlags(referencedFieldInfo.getAccessFlags(),
                                                      referencedMethodInfo.getAccessFlags());
                }
            }
            else
            {
                // We can't give the field the access of the getter or setter.
                // Forget about inlining it after all.
                getFieldPutFieldOpcode = 0;
            }
        }
    }


    /**
     * This MemberInfoVisitor checks whether the visited member is a simple
     * getter or setter.
     */
    private class MyGetterSetterChecker
    implements    MemberInfoVisitor,
                  AttrInfoVisitor,
                  InstructionVisitor,
                  CpInfoVisitor
    {
        // Implementations for MemberInfoVisitor.

        public void visitProgramFieldInfo(ProgramClassFile programClassFile, ProgramFieldInfo programFieldInfo) {}

        public void visitProgramMethodInfo(ProgramClassFile programClassFile, ProgramMethodInfo programMethodInfo)
        {
            programMethodInfo.attributesAccept(programClassFile, this);
        }


        public void visitLibraryFieldInfo(LibraryClassFile libraryClassFile, LibraryFieldInfo libraryFieldInfo) {}
        public void visitLibraryMethodInfo(LibraryClassFile libraryClassFile, LibraryMethodInfo libraryMethodInfo) {}


        // Implementations for AttrInfoVisitor.

        public void visitUnknownAttrInfo(ClassFile classFile, UnknownAttrInfo unknownAttrInfo) {}
        public void visitInnerClassesAttrInfo(ClassFile classFile, InnerClassesAttrInfo innerClassesAttrInfo) {}
        public void visitEnclosingMethodAttrInfo(ClassFile classFile, EnclosingMethodAttrInfo enclosingMethodAttrInfo) {}
        public void visitConstantValueAttrInfo(ClassFile classFile, FieldInfo fieldInfo, ConstantValueAttrInfo constantValueAttrInfo) {}
        public void visitExceptionsAttrInfo(ClassFile classFile, MethodInfo methodInfo, ExceptionsAttrInfo exceptionsAttrInfo) {}
        public void visitLineNumberTableAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, LineNumberTableAttrInfo lineNumberTableAttrInfo) {}
        public void visitLocalVariableTableAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, LocalVariableTableAttrInfo localVariableTableAttrInfo) {}
        public void visitLocalVariableTypeTableAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, LocalVariableTypeTableAttrInfo localVariableTypeTableAttrInfo) {}
        public void visitSourceFileAttrInfo(ClassFile classFile, SourceFileAttrInfo sourceFileAttrInfo) {}
        public void visitSourceDirAttrInfo(ClassFile classFile, SourceDirAttrInfo sourceDirAttrInfo) {}
        public void visitDeprecatedAttrInfo(ClassFile classFile, DeprecatedAttrInfo deprecatedAttrInfo) {}
        public void visitSyntheticAttrInfo(ClassFile classFile, SyntheticAttrInfo syntheticAttrInfo) {}
        public void visitSignatureAttrInfo(ClassFile classFile, SignatureAttrInfo signatureAttrInfo) {}
        public void visitRuntimeVisibleAnnotationAttrInfo(ClassFile classFile, RuntimeVisibleAnnotationsAttrInfo runtimeVisibleAnnotationsAttrInfo) {}
        public void visitRuntimeInvisibleAnnotationAttrInfo(ClassFile classFile, RuntimeInvisibleAnnotationsAttrInfo runtimeInvisibleAnnotationsAttrInfo) {}
        public void visitRuntimeVisibleParameterAnnotationAttrInfo(ClassFile classFile, RuntimeVisibleParameterAnnotationsAttrInfo runtimeVisibleParameterAnnotationsAttrInfo) {}
        public void visitRuntimeInvisibleParameterAnnotationAttrInfo(ClassFile classFile, RuntimeInvisibleParameterAnnotationsAttrInfo runtimeInvisibleParameterAnnotationsAttrInfo) {}
        public void visitAnnotationDefaultAttrInfo(ClassFile classFile, AnnotationDefaultAttrInfo annotationDefaultAttrInfo) {}


        public void visitCodeAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo)
        {
            byte[] code = codeAttrInfo.code;

            int         offset = 0;
            Instruction instruction;

            // TODO: Handle static getters and setters.

            // Check the first instruction.
            instruction = InstructionFactory.create(code, offset);
            if (instruction.opcode != InstructionConstants.OP_ALOAD_0)
            {
                return;
            }

            offset += instruction.length(offset);

            // Start remembering if this is a getter or a setter.
            boolean getter = true;

            // TODO: Handle array getters and setters.

            // Check the second instruction.
            instruction = InstructionFactory.create(code, offset);
            byte opcode = instruction.opcode;
            if (opcode == InstructionConstants.OP_ILOAD_1 ||
                opcode == InstructionConstants.OP_LLOAD_1 ||
                opcode == InstructionConstants.OP_FLOAD_1 ||
                opcode == InstructionConstants.OP_DLOAD_1 ||
                opcode == InstructionConstants.OP_ALOAD_1)
            {
                // This instruction is loading the argument. Skip it.
                offset += instruction.length(offset);

                instruction = InstructionFactory.create(code, offset);
                opcode      = instruction.opcode;

                // So this is a setter.
                getter = false;
            }

            // Check the next instruction.
            if (getter ? opcode != InstructionConstants.OP_GETFIELD :
                         opcode != InstructionConstants.OP_PUTFIELD)
            {
                return;
            }

            // Retrieve the field class, name and type.
            instruction.accept(classFile, methodInfo, codeAttrInfo, offset, this);

            // Check the class.
            // TODO: Handle fields that are in super classes.
            if (!classFile.equals(referencedClassFile))
            {
                return;
            }

            offset += instruction.length(offset);

            // Remember the instruction opcode.
            getFieldPutFieldOpcode = opcode;

            // Check the last instruction.
            instruction = InstructionFactory.create(code, offset);
            opcode      = instruction.opcode;
            if (getter ? opcode != InstructionConstants.OP_IRETURN &&
                         opcode != InstructionConstants.OP_LRETURN &&
                         opcode != InstructionConstants.OP_FRETURN &&
                         opcode != InstructionConstants.OP_DRETURN &&
                         opcode != InstructionConstants.OP_ARETURN :
                         opcode != InstructionConstants.OP_RETURN)
            {
                // This isn't a simple getter or setter.
                // Forget about inlining it.
                getFieldPutFieldOpcode = 0;
            }
        }


        // Implementations for InstructionVisitor.

        public void visitSimpleInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, SimpleInstruction simpleInstruction) {}
        public void visitVariableInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, VariableInstruction variableInstruction) {}
        public void visitBranchInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, BranchInstruction branchInstruction) {}
        public void visitTableSwitchInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, TableSwitchInstruction tableSwitchInstruction) {}
        public void visitLookUpSwitchInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, LookUpSwitchInstruction lookUpSwitchInstruction) {}


        public void visitCpInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, CpInstruction cpInstruction)
        {
            // Remember the index of the field reference.
            referencedFieldIndex = cpInstruction.cpIndex;

            // Retrieve the referenced field and its class file.
            classFile.constantPoolEntryAccept(cpInstruction.cpIndex, this);
        }


        // Implementations for CpInfoVisitor.

        public void visitIntegerCpInfo(ClassFile classFile, IntegerCpInfo integerCpInfo) {}
        public void visitLongCpInfo(ClassFile classFile, LongCpInfo longCpInfo) {}
        public void visitFloatCpInfo(ClassFile classFile, FloatCpInfo floatCpInfo) {}
        public void visitDoubleCpInfo(ClassFile classFile, DoubleCpInfo doubleCpInfo) {}
        public void visitStringCpInfo(ClassFile classFile, StringCpInfo stringCpInfo) {}
        public void visitUtf8CpInfo(ClassFile classFile, Utf8CpInfo utf8CpInfo) {}
        public void visitMethodrefCpInfo(ClassFile classFile, MethodrefCpInfo methodrefCpInfo) {}
        public void visitInterfaceMethodrefCpInfo(ClassFile classFile, InterfaceMethodrefCpInfo interfaceMethodrefCpInfo) {}
        public void visitClassCpInfo(ClassFile classFile, ClassCpInfo classCpInfo) {}


        public void visitFieldrefCpInfo(ClassFile classFile, FieldrefCpInfo fieldrefCpInfo)
        {
            // Remember the class file and the field.
            referencedClassFile = fieldrefCpInfo.referencedClassFile;
            referencedFieldInfo = fieldrefCpInfo.referencedMemberInfo;

            // Retrieve the referenced class files.
            classFile.constantPoolEntryAccept(fieldrefCpInfo.u2nameAndTypeIndex, this);
        }


        public void visitNameAndTypeCpInfo(ClassFile classFile, NameAndTypeCpInfo nameAndTypeCpInfo)
        {
            // Remember the referenced class files of the field.
            typeReferencedClassFiles = nameAndTypeCpInfo.referencedClassFiles;
        }
    }
}