Examples of org.mvel2.asm.MethodVisitor

org.mvel2.asm.MethodVisitor
A visitor to visit a Java method. The methods of this class must be called in the following order: ( visitParameter )* [ visitAnnotationDefault ] ( visitAnnotation | visitTypeAnnotation | visitAttribute )* [ visitCode ( visitFrame | visitXInsn | visitLabel | visitInsnAnnotation | visitTryCatchBlock | visitTryCatchBlockAnnotation | visitLocalVariable | visitLocalVariableAnnotation | visitLineNumber )* visitMaxs ] visitEnd. In addition, the visitXInsn and visitLabel methods must be called in the sequential order of the bytecode instructions of the visited code, visitInsnAnnotation must be called after the annotated instruction, visitTryCatchBlock must be called before the labels passed as arguments have been visited, visitTryCatchBlockAnnotation must be called after the corresponding try catch block has been visited, and the visitLocalVariable, visitLocalVariableAnnotation and visitLineNumber methods must be called after the labels passed as arguments have been visited. @author Eric Bruneton

        }
    }




    protected void buildConstructors(ClassWriter cw, EnumClassDefinition classDef) throws IOException, ClassNotFoundException {
        MethodVisitor mv;
        String argTypes = "";
        int size = 0;
        for ( FieldDefinition fld : classDef.getFieldsDefinitions() ) {
            argTypes += BuildUtils.getTypeDescriptor( fld.getTypeName() );
            size += BuildUtils.sizeOf( fld.getTypeName() );
        }




        {
            int ofs = 3;


            mv = cw.visitMethod( ACC_PRIVATE,
                    "<init>",
                    "(Ljava/lang/String;I" + argTypes +")V",
                    "(" + argTypes + ")V",
                    null );
            mv.visitCode();
            mv.visitVarInsn( ALOAD, 0 );
            mv.visitVarInsn( ALOAD, 1 );
            mv.visitVarInsn( ILOAD, 2 );
            mv.visitMethodInsn( INVOKESPECIAL,
                    "java/lang/Enum",
                    "<init>",
                    "(Ljava/lang/String;I)V" );
            for ( FieldDefinition fld : classDef.getFieldsDefinitions() ) {
                mv.visitVarInsn( ALOAD, 0 );
                mv.visitVarInsn( BuildUtils.varType( fld.getTypeName() ), ofs );
                mv.visitFieldInsn( PUTFIELD,
                        BuildUtils.getInternalType( classDef.getName() ),
                        fld.getName(),
                        BuildUtils.getTypeDescriptor( fld.getTypeName() ) );
                ofs += BuildUtils.sizeOf( fld.getTypeName() );
            }
            mv.visitInsn( RETURN );
            mv.visitMaxs( 3, ofs );
            mv.visitEnd();
        }




        {




            mv = cw.visitMethod( ACC_STATIC,
                    "<clinit>",
                    "()V",
                    null,
                    null);
            mv.visitCode();


            int N = classDef.getEnumLiterals().size();


            mv.visitTypeInsn( NEW,
                    BuildUtils.getInternalType( classDef.getClassName() ) );


            for ( int j = 0; j < N; j++ ) {
                EnumLiteralDefinition lit = classDef.getEnumLiterals().get( j );
                mv.visitInsn( DUP );
                mv.visitLdcInsn( lit.getName() );
                BuildUtils.pushInt( mv, j );


                List<String> args = lit.getConstructorArgs();
                for ( int k = 0; k < args.size(); k++ ) {
                    String argType = classDef.getField( k ).getTypeName();


                    mv.visitLdcInsn( args.get( k ) );
                    mv.visitMethodInsn( INVOKESTATIC,
                            "org/mvel2/MVEL",
                            "eval",
                            "(Ljava/lang/String;)Ljava/lang/Object;");


                    if ( BuildUtils.isPrimitive( argType ) ) {
                        mv.visitTypeInsn( CHECKCAST,
                                BuildUtils.getInternalType( BuildUtils.box( argType ) ) );
                        mv.visitMethodInsn( INVOKEVIRTUAL,
                                BuildUtils.getInternalType( BuildUtils.box( argType ) ),
                                BuildUtils.numericMorph( BuildUtils.box( argType ) ),
                                "()" + BuildUtils.getTypeDescriptor( argType ) );
                    } else {
                        mv.visitTypeInsn( CHECKCAST,
                                BuildUtils.getInternalType( argType ) );
                    }
                }


                mv.visitMethodInsn( INVOKESPECIAL,
                        BuildUtils.getInternalType( classDef.getClassName() ),
                        "<init>",
                        "(Ljava/lang/String;I" + argTypes + ")V" );
                mv.visitFieldInsn(PUTSTATIC,
                        BuildUtils.getInternalType(classDef.getClassName()),
                        lit.getName(),
                        BuildUtils.getTypeDescriptor(classDef.getClassName()));
                mv.visitTypeInsn( NEW, BuildUtils.getInternalType( classDef.getClassName() ) );
            }




            BuildUtils.pushInt( mv, N );
            mv.visitTypeInsn( ANEWARRAY, BuildUtils.getInternalType( classDef.getClassName() ));


            for ( int j = 0; j < N; j++ ) {
                EnumLiteralDefinition lit = classDef.getEnumLiterals().get( j );
                mv.visitInsn(DUP);
                BuildUtils.pushInt( mv, j );
                mv.visitFieldInsn( GETSTATIC,
                        BuildUtils.getInternalType( classDef.getClassName() ),
                        lit.getName(),
                        BuildUtils.getTypeDescriptor( classDef.getClassName() ) );
                mv.visitInsn(AASTORE);
            }




            mv.visitFieldInsn( PUTSTATIC,
                    BuildUtils.getInternalType( classDef.getClassName() ),
                    "$VALUES",
                    "[" + BuildUtils.getTypeDescriptor( classDef.getClassName() ));


            mv.visitInsn( RETURN );
            mv.visitMaxs( 4 + size, 0 );
            mv.visitEnd();
        }






        {
            mv = cw.visitMethod( ACC_PUBLIC + ACC_STATIC,
                    "valueOf",
                    "(Ljava/lang/String;)" + BuildUtils.getTypeDescriptor( classDef.getClassName() ),
                    null,
                    null );
            mv.visitCode();
            mv.visitLdcInsn( Type.getType( BuildUtils.getTypeDescriptor( classDef.getClassName() ) ) );
            mv.visitVarInsn( ALOAD, 0 );
            mv.visitMethodInsn( INVOKESTATIC,
                    "java/lang/Enum",
                    "valueOf",
                    "(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;" );
            mv.visitTypeInsn( CHECKCAST,
                    BuildUtils.getInternalType( classDef.getClassName() ) );
            mv.visitInsn( ARETURN );
            mv.visitMaxs( 2, 1 );
            mv.visitEnd();
        }
    }

View Full Code Here








    protected void buildGettersAndSetters(ClassWriter cw, EnumClassDefinition classDef) {
        MethodVisitor mv;
        {
            mv = cw.visitMethod( ACC_PUBLIC + ACC_STATIC,
                    "values",
                    "()[" + BuildUtils.getTypeDescriptor( classDef.getClassName() ),
                    null,
                    null);
            mv.visitCode();
            mv.visitFieldInsn( GETSTATIC,
                    BuildUtils.getInternalType( classDef.getClassName() ),
                    "$VALUES",
                    "[" + BuildUtils.getTypeDescriptor( classDef.getClassName() ) );
            mv.visitMethodInsn( INVOKEVIRTUAL,
                    "[" + BuildUtils.getTypeDescriptor( classDef.getClassName() ),
                    "clone",
                    "()Ljava/lang/Object;" );
            mv.visitTypeInsn( CHECKCAST,
                    "[" + BuildUtils.getTypeDescriptor( classDef.getClassName() ) );
            mv.visitInsn( ARETURN );
            mv.visitMaxs( 1, 0 );
            mv.visitEnd();
        }


        for ( FieldDefinition fld : classDef.getFieldsDefinitions() ) {
            mv = cw.visitMethod( ACC_PUBLIC,
                    BuildUtils.getterName( fld.getName(), fld.getTypeName() ),
                    "()" + BuildUtils.getTypeDescriptor( fld.getTypeName() ),
                    null,
                    null );
            mv.visitCode();
            mv.visitVarInsn( ALOAD, 0 );
            mv.visitFieldInsn( GETFIELD,
                    BuildUtils.getInternalType( classDef.getName() ),
                    fld.getName(),
                    BuildUtils.getTypeDescriptor( fld.getTypeName() ) );
            mv.visitInsn( BuildUtils.returnType( fld.getTypeName() ) );
            mv.visitMaxs( BuildUtils.sizeOf( fld.getTypeName() ), 1 );
            mv.visitEnd();




            mv = cw.visitMethod( ACC_PUBLIC,
                    BuildUtils.setterName( fld.getName(), fld.getTypeName() ),
                    "(" + BuildUtils.getTypeDescriptor( fld.getTypeName() ) + ")V",
                    null,
                    null );
            mv.visitCode();
            mv.visitInsn( RETURN );
            mv.visitMaxs( 0, 1 + BuildUtils.sizeOf( fld.getTypeName() ) );
            mv.visitEnd();
        }






        {
            mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "get$context", "()Lorg/mvel2/ParserContext;", null, null);
            mv.visitCode();
            mv.visitFieldInsn(GETSTATIC, BuildUtils.getInternalType( classDef.getName() ), "$context", "Lorg/mvel2/ParserContext;");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(1, 0);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "set$context", "(Lorg/mvel2/ParserContext;)V", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(PUTSTATIC, BuildUtils.getInternalType( classDef.getName() ), "$context", "Lorg/mvel2/ParserContext;");
            mv.visitInsn(RETURN);
            mv.visitMaxs(1, 1);
            mv.visitEnd();
        }
    }

View Full Code Here






    protected void buildClearSoftFields( ClassWriter cw, String wrapperName, ClassDefinition trait, BitSet mask ) {


        MethodVisitor mv = cw.visitMethod( ACC_PRIVATE, "clearSoftFields", "()V", null, null );
        mv.visitCode();


        int j = 0;
        int stackSize = 0;
        for ( FieldDefinition field : trait.getFieldsDefinitions() ) {
            boolean isSoftField = TraitRegistry.isSoftField( field, j++, mask );
            if ( isSoftField ) {
                int size = clearSoftField(mv, wrapperName, field);
                stackSize = Math.max( stackSize, size );
            }
        }
        mv.visitInsn( RETURN );
//        mv.visitMaxs( 4 + stackSize, 2 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();
    }

View Full Code Here






    protected void buildContainsValue( ClassWriter cw, String wrapperName, String coreName, ClassDefinition trait, ClassDefinition core, BitSet mask ) {


        MethodVisitor mv = cw.visitMethod( ACC_PUBLIC, "containsValue", "(" + Type.getDescriptor( Object.class ) + ")Z", null, null );
        mv.visitCode();


        boolean hasNillable = false;
        for ( FieldDefinition field : core.getFieldsDefinitions() ) {
            if ( ! BuildUtils.isPrimitive( field.getTypeName() ) ) {
                hasNillable = true;
            }
        }
        Label l99 = null;
        if ( hasNillable ) {
            mv.visitVarInsn(ALOAD, 1);
            l99 = new Label();
            mv.visitJumpInsn(IFNONNULL, l99);
        }


        int j = 0;
        int N = core.getFieldsDefinitions().size();
        for ( FieldDefinition field : core.getFieldsDefinitions() ) {
            j++;
            if ( ! BuildUtils.isPrimitive( field.getTypeName() ) ) {
                TraitFactory.invokeExtractor( mv, wrapperName, trait, core, field );
                if ( j != N ) {
                    Label l1 = new Label();
                    mv.visitJumpInsn( IFNONNULL, l1 );
                    mv.visitInsn( ICONST_1 );
                    mv.visitInsn( IRETURN );
                    mv.visitLabel( l1 );
                } else {
                    mv.visitJumpInsn( IFNONNULL, l99 );
                    mv.visitInsn( ICONST_1 );
                    mv.visitInsn( IRETURN );
                    mv.visitLabel( l99 );
                }


            }
        }


        mv.visitVarInsn( ALOAD, 0 );
        mv.visitVarInsn( ALOAD, 1 );
        mv.visitMethodInsn( INVOKESPECIAL,
                            Type.getInternalName( TripleBasedStruct.class ), 
                            "containsValue", 
                            "(" + Type.getDescriptor( Object.class ) + ")Z" );


        mv.visitInsn( IRETURN );
//        mv.visitMaxs( core.getFieldsDefinitions().size() > 0 ? 3 : 2, 2 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();


    }

View Full Code Here

        mv.visitLabel( l0 );
    }


    protected void buildContainsKey(ClassWriter cw, String name, String className, ClassDefinition trait, ClassDefinition core, BitSet mask) {


        MethodVisitor mv = cw.visitMethod( ACC_PUBLIC, 
                                           "containsKey", 
                                           "(" + Type.getDescriptor( Object.class ) + ")Z", 
                                           null, 
                                           null );
        mv.visitCode();


        for ( FieldDefinition field : core.getFieldsDefinitions() ) {
            invokeContainsKey( mv, field.getName() );
        }


        mv.visitVarInsn( ALOAD, 0 );
        mv.visitVarInsn( ALOAD, 1 );
        mv.visitMethodInsn( INVOKESPECIAL, 
                            Type.getInternalName( TripleBasedStruct.class ),
                            "containsKey",
                            "(" + Type.getDescriptor( Object.class ) + ")Z" );


        mv.visitInsn( IRETURN );
//        mv.visitMaxs( 2, 2 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();
    }

View Full Code Here

    }




    protected void buildSize( ClassVisitor cw, String wrapperName, String coreName, ClassDefinition trait, ClassDefinition core, BitSet mask ) {


        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "size", "()I", null, null);
        mv.visitCode();
        mv.visitVarInsn( ALOAD, 0 );
        mv.visitMethodInsn( INVOKESPECIAL, 
                            Type.getInternalName( TripleBasedStruct.class ), 
                            "size", 
                            "()I" );


        int n = core.getFieldsDefinitions().size();
        for ( int j = 0; j < n; j++ ) {
            mv.visitInsn( ICONST_1 );
            mv.visitInsn( IADD );
        }


        mv.visitInsn(IRETURN);
//        mv.visitMaxs( core.getFieldsDefinitions().size() > 0 ? 2 : 1,
//                1 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();


    }

View Full Code Here


    protected void buildIsEmpty( ClassVisitor cw, String wrapperName, String coreName, ClassDefinition trait, ClassDefinition core, BitSet mask ) {


        boolean hasHardFields = core.getFieldsDefinitions().size() > 0;


        MethodVisitor mv = cw.visitMethod( ACC_PUBLIC, "isEmpty", "()Z", null, null );
        mv.visitCode();


        if ( ! hasHardFields ) {
            mv.visitVarInsn( ALOAD, 0 );
            mv.visitMethodInsn( INVOKESPECIAL,
                                Type.getInternalName( TripleBasedStruct.class ), 
                                "isEmpty", 
                                "()Z" );
        } else {
            mv.visitInsn( ICONST_0 );
        }
        mv.visitInsn( IRETURN );
//        mv.visitMaxs( 1, 1 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();
    }

View Full Code Here






    protected void buildGet( ClassVisitor cw, String wrapperName, String coreName, ClassDefinition trait, ClassDefinition core, BitSet mask ) {


        MethodVisitor mv = cw.visitMethod( ACC_PUBLIC, 
                                           "get",
                                            "(" + Type.getDescriptor( Object.class ) + ")" + Type.getDescriptor( Object.class ),
                                            null, 
                                            null );
        mv.visitCode();


        if ( core.getFieldsDefinitions().size() > 0 ) {
            for ( FieldDefinition field : core.getFieldsDefinitions() ) {
                invokeGet( mv, wrapperName, core, field.getName(), field );
            }
        }


        mv.visitVarInsn( ALOAD, 0 );
        mv.visitVarInsn( ALOAD, 1 );
        mv.visitMethodInsn( INVOKESPECIAL, 
                            Type.getInternalName( TripleBasedStruct.class ),
                            "get", 
                            "(" + Type.getDescriptor( Object.class ) + ")" + Type.getDescriptor( Object.class ) );


        mv.visitInsn( ARETURN );
//        mv.visitMaxs( 2, 2 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();
    }

View Full Code Here

        mv.visitLabel( l1 );
    }
    
    protected void buildPut( ClassVisitor cw, String wrapperName, String coreName, ClassDefinition trait, ClassDefinition core, BitSet mask ) {


        MethodVisitor mv = cw.visitMethod( ACC_PUBLIC, 
                                           "put", 
                                            "(" + Type.getDescriptor( String.class) + Type.getDescriptor( Object.class ) + ")" + Type.getDescriptor( Object.class ),
                                            null, 
                                            null );
        mv.visitCode();


        if ( core.getFieldsDefinitions().size() > 0) {
            int j = 0;
            for ( FieldDefinition field : core.getFieldsDefinitions() ) {
                invokePut( mv, wrapperName, core, field.getName(), field );   
            }
        }




        mv.visitVarInsn( ALOAD, 0 );
        mv.visitVarInsn( ALOAD, 1 );
        mv.visitVarInsn( ALOAD, 2 );
        mv.visitMethodInsn( INVOKESPECIAL,
                            Type.getInternalName( TripleBasedStruct.class ),
                            "put",
                            "(" + Type.getDescriptor( String.class) + Type.getDescriptor( Object.class ) + ")" + Type.getDescriptor( Object.class ) );
        mv.visitInsn( ARETURN );
//        mv.visitMaxs( 4, 5 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();
    }

View Full Code Here

    




    protected void buildEntryset( ClassVisitor cw, String wrapperName, String coreName, ClassDefinition trait, ClassDefinition core, BitSet mask ) {


        MethodVisitor mv = cw.visitMethod( ACC_PUBLIC, 
                                           "entrySet", 
                                           "()" + Type.getDescriptor( Set.class ),
                                           "()Ljava/util/Set<Ljava/util/Map$Entry<Ljava/lang/String;Ljava/lang/Object;>;>;", 
                                           null );
        mv.visitCode();
        mv.visitTypeInsn( NEW, Type.getInternalName( HashSet.class ) );
        mv.visitInsn( DUP );
        mv.visitMethodInsn( INVOKESPECIAL, Type.getInternalName( HashSet.class ), "<init>", "()V" );
        mv.visitVarInsn( ASTORE, 1 );


        for ( FieldDefinition field : core.getFieldsDefinitions() ) {
            mv.visitVarInsn( ALOAD, 1 );
            mv.visitLdcInsn( field.getName() );


            TraitFactory.invokeExtractor( mv, wrapperName, trait, core, field );


            if ( BuildUtils.isPrimitive( field.getTypeName() ) ) {
                TraitFactory.valueOf( mv, field.getTypeName() );
            }


            mv.visitMethodInsn( INVOKESTATIC, 
                                Type.getInternalName( TraitProxy.class ), 
                                "buildEntry", 
                                "(" + Type.getDescriptor( String.class ) + Type.getDescriptor( Object.class ) + ")" + Type.getDescriptor( Map.Entry.class ) );
            mv.visitMethodInsn( INVOKEINTERFACE,
                                Type.getInternalName( Set.class ),
                                "add", 
                                "(" + Type.getDescriptor( Object.class ) + ")Z" );
            mv.visitInsn(POP);
        }


        mv.visitVarInsn( ALOAD, 1 );
        mv.visitVarInsn( ALOAD, 0 );
        mv.visitMethodInsn( INVOKESPECIAL,
                            Type.getInternalName( TripleBasedStruct.class ), 
                            "entrySet", 
                            "()" + Type.getDescriptor( Set.class ) );
        mv.visitMethodInsn( INVOKEINTERFACE,
                            Type.getInternalName( Set.class ),
                            "addAll", 
                            "(" + Type.getDescriptor( Collection.class ) + ")Z" );                       
        mv.visitInsn( POP );


        mv.visitVarInsn( ALOAD, 1 );
        mv.visitInsn( ARETURN );
//        mv.visitMaxs( core.getFieldsDefinitions().size() > 0 ?  4 : 2, 2 );
        mv.visitMaxs( 0, 0 );
        mv.visitEnd();


    }

View Full Code Here

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